diff options
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/Kconfig | 18 | ||||
| -rw-r--r-- | drivers/dma/Makefile | 2 | ||||
| -rw-r--r-- | drivers/dma/coh901318.c | 1325 | ||||
| -rw-r--r-- | drivers/dma/coh901318_lli.c | 318 | ||||
| -rw-r--r-- | drivers/dma/coh901318_lli.h | 124 | ||||
| -rw-r--r-- | drivers/dma/dmatest.c | 16 | ||||
| -rw-r--r-- | drivers/dma/iop-adma.c | 4 | ||||
| -rw-r--r-- | drivers/dma/ppc4xx/Makefile | 1 | ||||
| -rw-r--r-- | drivers/dma/ppc4xx/adma.c | 5027 | ||||
| -rw-r--r-- | drivers/dma/ppc4xx/adma.h | 195 | ||||
| -rw-r--r-- | drivers/dma/ppc4xx/dma.h | 223 | ||||
| -rw-r--r-- | drivers/dma/ppc4xx/xor.h | 110 | ||||
| -rw-r--r-- | drivers/dma/shdma.c | 36 | ||||
| -rw-r--r-- | drivers/dma/shdma.h | 14 |
14 files changed, 7383 insertions, 30 deletions
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index eb140ff38c27..e02d74b1e892 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -111,6 +111,24 @@ config SH_DMAE help Enable support for the Renesas SuperH DMA controllers. +config COH901318 + bool "ST-Ericsson COH901318 DMA support" + select DMA_ENGINE + depends on ARCH_U300 + help + Enable support for ST-Ericsson COH 901 318 DMA. + +config AMCC_PPC440SPE_ADMA + tristate "AMCC PPC440SPe ADMA support" + depends on 440SPe || 440SP + select DMA_ENGINE + select ARCH_HAS_ASYNC_TX_FIND_CHANNEL + help + Enable support for the AMCC PPC440SPe RAID engines. + +config ARCH_HAS_ASYNC_TX_FIND_CHANNEL + bool + config DMA_ENGINE bool diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index eca71ba78ae9..807053d48232 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -10,3 +10,5 @@ obj-$(CONFIG_AT_HDMAC) += at_hdmac.o obj-$(CONFIG_MX3_IPU) += ipu/ obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o obj-$(CONFIG_SH_DMAE) += shdma.o +obj-$(CONFIG_COH901318) += coh901318.o coh901318_lli.o +obj-$(CONFIG_AMCC_PPC440SPE_ADMA) += ppc4xx/ diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c new file mode 100644 index 000000000000..4a99cd94536b --- /dev/null +++ b/drivers/dma/coh901318.c @@ -0,0 +1,1325 @@ +/* + * driver/dma/coh901318.c + * + * Copyright (C) 2007-2009 ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + * DMA driver for COH 901 318 + * Author: Per Friden <per.friden@stericsson.com> + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> /* printk() */ +#include <linux/fs.h> /* everything... */ +#include <linux/slab.h> /* kmalloc() */ +#include <linux/dmaengine.h> +#include <linux/platform_device.h> +#include <linux/device.h> +#include <linux/irqreturn.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/uaccess.h> +#include <linux/debugfs.h> +#include <mach/coh901318.h> + +#include "coh901318_lli.h" + +#define COHC_2_DEV(cohc) (&cohc->chan.dev->device) + +#ifdef VERBOSE_DEBUG +#define COH_DBG(x) ({ if (1) x; 0; }) +#else +#define COH_DBG(x) ({ if (0) x; 0; }) +#endif + +struct coh901318_desc { + struct dma_async_tx_descriptor desc; + struct list_head node; + struct scatterlist *sg; + unsigned int sg_len; + struct coh901318_lli *data; + enum dma_data_direction dir; + int pending_irqs; + unsigned long flags; +}; + +struct coh901318_base { + struct device *dev; + void __iomem *virtbase; + struct coh901318_pool pool; + struct powersave pm; + struct dma_device dma_slave; + struct dma_device dma_memcpy; + struct coh901318_chan *chans; + struct coh901318_platform *platform; +}; + +struct coh901318_chan { + spinlock_t lock; + int allocated; + int completed; + int id; + int stopped; + + struct work_struct free_work; + struct dma_chan chan; + + struct tasklet_struct tasklet; + + struct list_head active; + struct list_head queue; + struct list_head free; + + unsigned long nbr_active_done; + unsigned long busy; + int pending_irqs; + + struct coh901318_base *base; +}; + +static void coh901318_list_print(struct coh901318_chan *cohc, + struct coh901318_lli *lli) +{ + struct coh901318_lli *l; + dma_addr_t addr = virt_to_phys(lli); + int i = 0; + + while (addr) { + l = phys_to_virt(addr); + dev_vdbg(COHC_2_DEV(cohc), "i %d, lli %p, ctrl 0x%x, src 0x%x" + ", dst 0x%x, link 0x%x link_virt 0x%p\n", + i, l, l->control, l->src_addr, l->dst_addr, + l->link_addr, phys_to_virt(l->link_addr)); + i++; + addr = l->link_addr; + } +} + +#ifdef CONFIG_DEBUG_FS + +#define COH901318_DEBUGFS_ASSIGN(x, y) (x = y) + +static struct coh901318_base *debugfs_dma_base; +static struct dentry *dma_dentry; + +static int coh901318_debugfs_open(struct inode *inode, struct file *file) +{ + + file->private_data = inode->i_private; + return 0; +} + +static int coh901318_debugfs_read(struct file *file, char __user *buf, + size_t count, loff_t *f_pos) +{ + u64 started_channels = debugfs_dma_base->pm.started_channels; + int pool_count = debugfs_dma_base->pool.debugfs_pool_counter; + int i; + int ret = 0; + char *dev_buf; + char *tmp; + int dev_size; + + dev_buf = kmalloc(4*1024, GFP_KERNEL); + if (dev_buf == NULL) + goto err_kmalloc; + tmp = dev_buf; + + tmp += sprintf(tmp, "DMA -- enable dma channels\n"); + + for (i = 0; i < debugfs_dma_base->platform->max_channels; i++) + if (started_channels & (1 << i)) + tmp += sprintf(tmp, "channel %d\n", i); + + tmp += sprintf(tmp, "Pool alloc nbr %d\n", pool_count); + dev_size = tmp - dev_buf; + + /* No more to read if offset != 0 */ + if (*f_pos > dev_size) + goto out; + + if (count > dev_size - *f_pos) + count = dev_size - *f_pos; + + if (copy_to_user(buf, dev_buf + *f_pos, count)) + ret = -EINVAL; + ret = count; + *f_pos += count; + + out: + kfree(dev_buf); + return ret; + + err_kmalloc: + return 0; +} + +static const struct file_operations coh901318_debugfs_status_operations = { + .owner = THIS_MODULE, + .open = coh901318_debugfs_open, + .read = coh901318_debugfs_read, +}; + + +static int __init init_coh901318_debugfs(void) +{ + + dma_dentry = debugfs_create_dir("dma", NULL); + + (void) debugfs_create_file("status", + S_IFREG | S_IRUGO, + dma_dentry, NULL, + &coh901318_debugfs_status_operations); + return 0; +} + +static void __exit exit_coh901318_debugfs(void) +{ + debugfs_remove_recursive(dma_dentry); +} + +module_init(init_coh901318_debugfs); +module_exit(exit_coh901318_debugfs); +#else + +#define COH901318_DEBUGFS_ASSIGN(x, y) + +#endif /* CONFIG_DEBUG_FS */ + +static inline struct coh901318_chan *to_coh901318_chan(struct dma_chan *chan) +{ + return container_of(chan, struct coh901318_chan, chan); +} + +static inline dma_addr_t +cohc_dev_addr(struct coh901318_chan *cohc) +{ + return cohc->base->platform->chan_conf[cohc->id].dev_addr; +} + +static inline const struct coh901318_params * +cohc_chan_param(struct coh901318_chan *cohc) +{ + return &cohc->base->platform->chan_conf[cohc->id].param; +} + +static inline const struct coh_dma_channel * +cohc_chan_conf(struct coh901318_chan *cohc) +{ + return &cohc->base->platform->chan_conf[cohc->id]; +} + +static void enable_powersave(struct coh901318_chan *cohc) +{ + unsigned long flags; + struct powersave *pm = &cohc->base->pm; + + spin_lock_irqsave(&pm->lock, flags); + + pm->started_channels &= ~(1ULL << cohc->id); + + if (!pm->started_channels) { + /* DMA no longer intends to access memory */ + cohc->base->platform->access_memory_state(cohc->base->dev, + false); + } + + spin_unlock_irqrestore(&pm->lock, flags); +} +static void disable_powersave(struct coh901318_chan *cohc) +{ + unsigned long flags; + struct powersave *pm = &cohc->base->pm; + + spin_lock_irqsave(&pm->lock, flags); + + if (!pm->started_channels) { + /* DMA intends to access memory */ + cohc->base->platform->access_memory_state(cohc->base->dev, + true); + } + + pm->started_channels |= (1ULL << cohc->id); + + spin_unlock_irqrestore(&pm->lock, flags); +} + +static inline int coh901318_set_ctrl(struct coh901318_chan *cohc, u32 control) +{ + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + writel(control, + virtbase + COH901318_CX_CTRL + + COH901318_CX_CTRL_SPACING * channel); + return 0; +} + +static inline int coh901318_set_conf(struct coh901318_chan *cohc, u32 conf) +{ + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + writel(conf, + virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING*channel); + return 0; +} + + +static int coh901318_start(struct coh901318_chan *cohc) +{ + u32 val; + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + disable_powersave(cohc); + + val = readl(virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + + /* Enable channel */ + val |= COH901318_CX_CFG_CH_ENABLE; + writel(val, virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + + return 0; +} + +static int coh901318_prep_linked_list(struct coh901318_chan *cohc, + struct coh901318_lli *data) +{ + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + BUG_ON(readl(virtbase + COH901318_CX_STAT + + COH901318_CX_STAT_SPACING*channel) & + COH901318_CX_STAT_ACTIVE); + + writel(data->src_addr, + virtbase + COH901318_CX_SRC_ADDR + + COH901318_CX_SRC_ADDR_SPACING * channel); + + writel(data->dst_addr, virtbase + + COH901318_CX_DST_ADDR + + COH901318_CX_DST_ADDR_SPACING * channel); + + writel(data->link_addr, virtbase + COH901318_CX_LNK_ADDR + + COH901318_CX_LNK_ADDR_SPACING * channel); + + writel(data->control, virtbase + COH901318_CX_CTRL + + COH901318_CX_CTRL_SPACING * channel); + + return 0; +} +static dma_cookie_t +coh901318_assign_cookie(struct coh901318_chan *cohc, + struct coh901318_desc *cohd) +{ + dma_cookie_t cookie = cohc->chan.cookie; + + if (++cookie < 0) + cookie = 1; + + cohc->chan.cookie = cookie; + cohd->desc.cookie = cookie; + + return cookie; +} + +static struct coh901318_desc * +coh901318_desc_get(struct coh901318_chan *cohc) +{ + struct coh901318_desc *desc; + + if (list_empty(&cohc->free)) { + /* alloc new desc because we're out of used ones + * TODO: alloc a pile of descs instead of just one, + * avoid many small allocations. + */ + desc = kmalloc(sizeof(struct coh901318_desc), GFP_NOWAIT); + if (desc == NULL) + goto out; + INIT_LIST_HEAD(&desc->node); + } else { + /* Reuse an old desc. */ + desc = list_first_entry(&cohc->free, + struct coh901318_desc, + node); + list_del(&desc->node); + } + + out: + return desc; +} + +static void +coh901318_desc_free(struct coh901318_chan *cohc, struct coh901318_desc *cohd) +{ + list_add_tail(&cohd->node, &cohc->free); +} + +/* call with irq lock held */ +static void +coh901318_desc_submit(struct coh901318_chan *cohc, struct coh901318_desc *desc) +{ + list_add_tail(&desc->node, &cohc->active); + + BUG_ON(cohc->pending_irqs != 0); + + cohc->pending_irqs = desc->pending_irqs; +} + +static struct coh901318_desc * +coh901318_first_active_get(struct coh901318_chan *cohc) +{ + struct coh901318_desc *d; + + if (list_empty(&cohc->active)) + return NULL; + + d = list_first_entry(&cohc->active, + struct coh901318_desc, + node); + return d; +} + +static void +coh901318_desc_remove(struct coh901318_desc *cohd) +{ + list_del(&cohd->node); +} + +static void +coh901318_desc_queue(struct coh901318_chan *cohc, struct coh901318_desc *desc) +{ + list_add_tail(&desc->node, &cohc->queue); +} + +static struct coh901318_desc * +coh901318_first_queued(struct coh901318_chan *cohc) +{ + struct coh901318_desc *d; + + if (list_empty(&cohc->queue)) + return NULL; + + d = list_first_entry(&cohc->queue, + struct coh901318_desc, + node); + return d; +} + +/* + * DMA start/stop controls + */ +u32 coh901318_get_bytes_left(struct dma_chan *chan) +{ + unsigned long flags; + u32 ret; + struct coh901318_chan *cohc = to_coh901318_chan(chan); + + spin_lock_irqsave(&cohc->lock, flags); + + /* Read transfer count value */ + ret = readl(cohc->base->virtbase + + COH901318_CX_CTRL+COH901318_CX_CTRL_SPACING * + cohc->id) & COH901318_CX_CTRL_TC_VALUE_MASK; + + spin_unlock_irqrestore(&cohc->lock, flags); + + return ret; +} +EXPORT_SYMBOL(coh901318_get_bytes_left); + + +/* Stops a transfer without losing data. Enables power save. + Use this function in conjunction with coh901318_continue(..) +*/ +void coh901318_stop(struct dma_chan *chan) +{ + u32 val; + unsigned long flags; + struct coh901318_chan *cohc = to_coh901318_chan(chan); + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + spin_lock_irqsave(&cohc->lock, flags); + + /* Disable channel in HW */ + val = readl(virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + + /* Stopping infinit transfer */ + if ((val & COH901318_CX_CTRL_TC_ENABLE) == 0 && + (val & COH901318_CX_CFG_CH_ENABLE)) + cohc->stopped = 1; + + + val &= ~COH901318_CX_CFG_CH_ENABLE; + /* Enable twice, HW bug work around */ + writel(val, virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + writel(val, virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + + /* Spin-wait for it to actually go inactive */ + while (readl(virtbase + COH901318_CX_STAT+COH901318_CX_STAT_SPACING * + channel) & COH901318_CX_STAT_ACTIVE) + cpu_relax(); + + /* Check if we stopped an active job */ + if ((readl(virtbase + COH901318_CX_CTRL+COH901318_CX_CTRL_SPACING * + channel) & COH901318_CX_CTRL_TC_VALUE_MASK) > 0) + cohc->stopped = 1; + + enable_powersave(cohc); + + spin_unlock_irqrestore(&cohc->lock, flags); +} +EXPORT_SYMBOL(coh901318_stop); + +/* Continues a transfer that has been stopped via 300_dma_stop(..). + Power save is handled. +*/ +void coh901318_continue(struct dma_chan *chan) +{ + u32 val; + unsigned long flags; + struct coh901318_chan *cohc = to_coh901318_chan(chan); + int channel = cohc->id; + + spin_lock_irqsave(&cohc->lock, flags); + + disable_powersave(cohc); + + if (cohc->stopped) { + /* Enable channel in HW */ + val = readl(cohc->base->virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + + val |= COH901318_CX_CFG_CH_ENABLE; + + writel(val, cohc->base->virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING*channel); + + cohc->stopped = 0; + } + + spin_unlock_irqrestore(&cohc->lock, flags); +} +EXPORT_SYMBOL(coh901318_continue); + +bool coh901318_filter_id(struct dma_chan *chan, void *chan_id) +{ + unsigned int ch_nr = (unsigned int) chan_id; + + if (ch_nr == to_coh901318_chan(chan)->id) + return true; + + return false; +} +EXPORT_SYMBOL(coh901318_filter_id); + +/* + * DMA channel allocation + */ +static int coh901318_config(struct coh901318_chan *cohc, + struct coh901318_params *param) +{ + unsigned long flags; + const struct coh901318_params *p; + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + spin_lock_irqsave(&cohc->lock, flags); + + if (param) + p = param; + else + p = &cohc->base->platform->chan_conf[channel].param; + + /* Clear any pending BE or TC interrupt */ + if (channel < 32) { + writel(1 << channel, virtbase + COH901318_BE_INT_CLEAR1); + writel(1 << channel, virtbase + COH901318_TC_INT_CLEAR1); + } else { + writel(1 << (channel - 32), virtbase + + COH901318_BE_INT_CLEAR2); + writel(1 << (channel - 32), virtbase + + COH901318_TC_INT_CLEAR2); + } + + coh901318_set_conf(cohc, p->config); + coh901318_set_ctrl(cohc, p->ctrl_lli_last); + + spin_unlock_irqrestore(&cohc->lock, flags); + + return 0; +} + +/* must lock when calling this function + * start queued jobs, if any + * TODO: start all queued jobs in one go + * + * Returns descriptor if queued job is started otherwise NULL. + * If the queue is empty NULL is returned. + */ +static struct coh901318_desc *coh901318_queue_start(struct coh901318_chan *cohc) +{ + struct coh901318_desc *cohd_que; + + /* start queued jobs, if any + * TODO: transmit all queued jobs in one go + */ + cohd_que = coh901318_first_queued(cohc); + + if (cohd_que != NULL) { + /* Remove from queue */ + coh901318_desc_remove(cohd_que); + /* initiate DMA job */ + cohc->busy = 1; + + coh901318_desc_submit(cohc, cohd_que); + + coh901318_prep_linked_list(cohc, cohd_que->data); + + /* start dma job */ + coh901318_start(cohc); + + } + + return cohd_que; +} + +static void dma_tasklet(unsigned long data) +{ + struct coh901318_chan *cohc = (struct coh901318_chan *) data; + struct coh901318_desc *cohd_fin; + unsigned long flags; + dma_async_tx_callback callback; + void *callback_param; + + spin_lock_irqsave(&cohc->lock, flags); + + /* get first active entry from list */ + cohd_fin = coh901318_first_active_get(cohc); + + BUG_ON(cohd_fin->pending_irqs == 0); + + if (cohd_fin == NULL) + goto err; + + cohd_fin->pending_irqs--; + cohc->completed = cohd_fin->desc.cookie; + + BUG_ON(cohc->nbr_active_done && cohd_fin == NULL); + + if (cohc->nbr_active_done == 0) + return; + + if (!cohd_fin->pending_irqs) { + /* release the lli allocation*/ + coh901318_lli_free(&cohc->base->pool, &cohd_fin->data); + } + + dev_vdbg(COHC_2_DEV(cohc), "[%s] chan_id %d pending_irqs %d" + " nbr_active_done %ld\n", __func__, + cohc->id, cohc->pending_irqs, cohc->nbr_active_done); + + /* callback to client */ + callback = cohd_fin->desc.callback; + callback_param = cohd_fin->desc.callback_param; + + if (!cohd_fin->pending_irqs) { + coh901318_desc_remove(cohd_fin); + + /* return desc to free-list */ + coh901318_desc_free(cohc, cohd_fin); + } + + if (cohc->nbr_active_done) + cohc->nbr_active_done--; + + if (cohc->nbr_active_done) { + if (cohc_chan_conf(cohc)->priority_high) + tasklet_hi_schedule(&cohc->tasklet); + else + tasklet_schedule(&cohc->tasklet); + } + spin_unlock_irqrestore(&cohc->lock, flags); + + if (callback) + callback(callback_param); + + return; + + err: + spin_unlock_irqrestore(&cohc->lock, flags); + dev_err(COHC_2_DEV(cohc), "[%s] No active dma desc\n", __func__); +} + + +/* called from interrupt context */ +static void dma_tc_handle(struct coh901318_chan *cohc) +{ + BUG_ON(!cohc->allocated && (list_empty(&cohc->active) || + list_empty(&cohc->queue))); + + if (!cohc->allocated) + return; + + BUG_ON(cohc->pending_irqs == 0); + + cohc->pending_irqs--; + cohc->nbr_active_done++; + + if (cohc->pending_irqs == 0 && coh901318_queue_start(cohc) == NULL) + cohc->busy = 0; + + BUG_ON(list_empty(&cohc->active)); + + if (cohc_chan_conf(cohc)->priority_high) + tasklet_hi_schedule(&cohc->tasklet); + else + tasklet_schedule(&cohc->tasklet); +} + + +static irqreturn_t dma_irq_handler(int irq, void *dev_id) +{ + u32 status1; + u32 status2; + int i; + int ch; + struct coh901318_base *base = dev_id; + struct coh901318_chan *cohc; + void __iomem *virtbase = base->virtbase; + + status1 = readl(virtbase + COH901318_INT_STATUS1); + status2 = readl(virtbase + COH901318_INT_STATUS2); + + if (unlikely(status1 == 0 && status2 == 0)) { + dev_warn(base->dev, "spurious DMA IRQ from no channel!\n"); + return IRQ_HANDLED; + } + + /* TODO: consider handle IRQ in tasklet here to + * minimize interrupt latency */ + + /* Check the first 32 DMA channels for IRQ */ + while (status1) { + /* Find first bit set, return as a number. */ + i = ffs(status1) - 1; + ch = i; + + cohc = &base->chans[ch]; + spin_lock(&cohc->lock); + + /* Mask off this bit */ + status1 &= ~(1 << i); + /* Check the individual channel bits */ + if (test_bit(i, virtbase + COH901318_BE_INT_STATUS1)) { + dev_crit(COHC_2_DEV(cohc), + "DMA bus error on channel %d!\n", ch); + BUG_ON(1); + /* Clear BE interrupt */ + __set_bit(i, virtbase + COH901318_BE_INT_CLEAR1); + } else { + /* Caused by TC, really? */ + if (unlikely(!test_bit(i, virtbase + + COH901318_TC_INT_STATUS1))) { + dev_warn(COHC_2_DEV(cohc), + "ignoring interrupt not caused by terminal count on channel %d\n", ch); + /* Clear TC interrupt */ + BUG_ON(1); + __set_bit(i, virtbase + COH901318_TC_INT_CLEAR1); + } else { + /* Enable powersave if transfer has finished */ + if (!(readl(virtbase + COH901318_CX_STAT + + COH901318_CX_STAT_SPACING*ch) & + COH901318_CX_STAT_ENABLED)) { + enable_powersave(cohc); + } + + /* Must clear TC interrupt before calling + * dma_tc_handle + * in case tc_handle initate a new dma job + */ + __set_bit(i, virtbase + COH901318_TC_INT_CLEAR1); + + dma_tc_handle(cohc); + } + } + spin_unlock(&cohc->lock); + } + + /* Check the remaining 32 DMA channels for IRQ */ + while (status2) { + /* Find first bit set, return as a number. */ + i = ffs(status2) - 1; + ch = i + 32; + cohc = &base->chans[ch]; + spin_lock(&cohc->lock); + + /* Mask off this bit */ + status2 &= ~(1 << i); + /* Check the individual channel bits */ + if (test_bit(i, virtbase + COH901318_BE_INT_STATUS2)) { + dev_crit(COHC_2_DEV(cohc), + "DMA bus error on channel %d!\n", ch); + /* Clear BE interrupt */ + BUG_ON(1); + __set_bit(i, virtbase + COH901318_BE_INT_CLEAR2); + } else { + /* Caused by TC, really? */ + if (unlikely(!test_bit(i, virtbase + + COH901318_TC_INT_STATUS2))) { + dev_warn(COHC_2_DEV(cohc), + "ignoring interrupt not caused by terminal count on channel %d\n", ch); + /* Clear TC interrupt */ + __set_bit(i, virtbase + COH901318_TC_INT_CLEAR2); + BUG_ON(1); + } else { + /* Enable powersave if transfer has finished */ + if (!(readl(virtbase + COH901318_CX_STAT + + COH901318_CX_STAT_SPACING*ch) & + COH901318_CX_STAT_ENABLED)) { + enable_powersave(cohc); + } + /* Must clear TC interrupt before calling + * dma_tc_handle + * in case tc_handle initate a new dma job + */ + __set_bit(i, virtbase + COH901318_TC_INT_CLEAR2); + + dma_tc_handle(cohc); + } + } + spin_unlock(&cohc->lock); + } + + return IRQ_HANDLED; +} + +static int coh901318_alloc_chan_resources(struct dma_chan *chan) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + + dev_vdbg(COHC_2_DEV(cohc), "[%s] DMA channel %d\n", + __func__, cohc->id); + + if (chan->client_count > 1) + return -EBUSY; + + coh901318_config(cohc, NULL); + + cohc->allocated = 1; + cohc->completed = chan->cookie = 1; + + return 1; +} + +static void +coh901318_free_chan_resources(struct dma_chan *chan) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + int channel = cohc->id; + unsigned long flags; + + spin_lock_irqsave(&cohc->lock, flags); + + /* Disable HW */ + writel(0x00000000U, cohc->base->virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING*channel); + writel(0x00000000U, cohc->base->virtbase + COH901318_CX_CTRL + + COH901318_CX_CTRL_SPACING*channel); + + cohc->allocated = 0; + + spin_unlock_irqrestore(&cohc->lock, flags); + + chan->device->device_terminate_all(chan); +} + + +static dma_cookie_t +coh901318_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct coh901318_desc *cohd = container_of(tx, struct coh901318_desc, + desc); + struct coh901318_chan *cohc = to_coh901318_chan(tx->chan); + unsigned long flags; + + spin_lock_irqsave(&cohc->lock, flags); + + tx->cookie = coh901318_assign_cookie(cohc, cohd); + + coh901318_desc_queue(cohc, cohd); + + spin_unlock_irqrestore(&cohc->lock, flags); + + return tx->cookie; +} + +static struct dma_async_tx_descriptor * +coh901318_prep_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t size, unsigned long flags) +{ + struct coh901318_lli *data; + struct coh901318_desc *cohd; + unsigned long flg; + struct coh901318_chan *cohc = to_coh901318_chan(chan); + int lli_len; + u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last; + + spin_lock_irqsave(&cohc->lock, flg); + + dev_vdbg(COHC_2_DEV(cohc), + "[%s] channel %d src 0x%x dest 0x%x size %d\n", + __func__, cohc->id, src, dest, size); + + if (flags & DMA_PREP_INTERRUPT) + /* Trigger interrupt after last lli */ + ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE; + + lli_len = size >> MAX_DMA_PACKET_SIZE_SHIFT; + if ((lli_len << MAX_DMA_PACKET_SIZE_SHIFT) < size) + lli_len++; + + data = coh901318_lli_alloc(&cohc->base->pool, lli_len); + + if (data == NULL) + goto err; + + cohd = coh901318_desc_get(cohc); + cohd->sg = NULL; + cohd->sg_len = 0; + cohd->data = data; + + cohd->pending_irqs = + coh901318_lli_fill_memcpy( + &cohc->base->pool, data, src, size, dest, + cohc_chan_param(cohc)->ctrl_lli_chained, + ctrl_last); + cohd->flags = flags; + + COH_DBG(coh901318_list_print(cohc, data)); + + dma_async_tx_descriptor_init(&cohd->desc, chan); + + cohd->desc.tx_submit = coh901318_tx_submit; + + spin_unlock_irqrestore(&cohc->lock, flg); + + return &cohd->desc; + err: + spin_unlock_irqrestore(&cohc->lock, flg); + return NULL; +} + +static struct dma_async_tx_descriptor * +coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_data_direction direction, + unsigned long flags) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + struct coh901318_lli *data; + struct coh901318_desc *cohd; + struct scatterlist *sg; + int len = 0; + int size; + int i; + u32 ctrl_chained = cohc_chan_param(cohc)->ctrl_lli_chained; + u32 ctrl = cohc_chan_param(cohc)->ctrl_lli; + u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last; + unsigned long flg; + + if (!sgl) + goto out; + if (sgl->length == 0) + goto out; + + spin_lock_irqsave(&cohc->lock, flg); + + dev_vdbg(COHC_2_DEV(cohc), "[%s] sg_len %d dir %d\n", + __func__, sg_len, direction); + + if (flags & DMA_PREP_INTERRUPT) + /* Trigger interrupt after last lli */ + ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE; + + cohd = coh901318_desc_get(cohc); + cohd->sg = NULL; + cohd->sg_len = 0; + cohd->dir = direction; + + if (direction == DMA_TO_DEVICE) { + u32 tx_flags = COH901318_CX_CTRL_PRDD_SOURCE | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE; + + ctrl_chained |= tx_flags; + ctrl_last |= tx_flags; + ctrl |= tx_flags; + } else if (direction == DMA_FROM_DEVICE) { + u32 rx_flags = COH901318_CX_CTRL_PRDD_DEST | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE; + + ctrl_chained |= rx_flags; + ctrl_last |= rx_flags; + ctrl |= rx_flags; + } else + goto err_direction; + + dma_async_tx_descriptor_init(&cohd->desc, chan); + + cohd->desc.tx_submit = coh901318_tx_submit; + + + /* The dma only supports transmitting packages up to + * MAX_DMA_PACKET_SIZE. Calculate to total number of + * dma elemts required to send the entire sg list + */ + for_each_sg(sgl, sg, sg_len, i) { + unsigned int factor; + size = sg_dma_len(sg); + + if (size <= MAX_DMA_PACKET_SIZE) { + len++; + continue; + } + + factor = size >> MAX_DMA_PACKET_SIZE_SHIFT; + if ((factor << MAX_DMA_PACKET_SIZE_SHIFT) < size) + factor++; + + len += factor; + } + + data = coh901318_lli_alloc(&cohc->base->pool, len); + + if (data == NULL) + goto err_dma_alloc; + + /* initiate allocated data list */ + cohd->pending_irqs = + coh901318_lli_fill_sg(&cohc->base->pool, data, sgl, sg_len, + cohc_dev_addr(cohc), + ctrl_chained, + ctrl, + ctrl_last, + direction, COH901318_CX_CTRL_TC_IRQ_ENABLE); + cohd->data = data; + + cohd->flags = flags; + + COH_DBG(coh901318_list_print(cohc, data)); + + spin_unlock_irqrestore(&cohc->lock, flg); + + return &cohd->desc; + err_dma_alloc: + err_direction: + coh901318_desc_remove(cohd); + coh901318_desc_free(cohc, cohd); + spin_unlock_irqrestore(&cohc->lock, flg); + out: + return NULL; +} + +static enum dma_status +coh901318_is_tx_complete(struct dma_chan *chan, + dma_cookie_t cookie, dma_cookie_t *done, + dma_cookie_t *used) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + dma_cookie_t last_used; + dma_cookie_t last_complete; + int ret; + + last_complete = cohc->completed; + last_used = chan->cookie; + + ret = dma_async_is_complete(cookie, last_complete, last_used); + + if (done) + *done = last_complete; + if (used) + *used = last_used; + + return ret; +} + +static void +coh901318_issue_pending(struct dma_chan *chan) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&cohc->lock, flags); + + /* Busy means that pending jobs are already being processed */ + if (!cohc->busy) + coh901318_queue_start(cohc); + + spin_unlock_irqrestore(&cohc->lock, flags); +} + +static void +coh901318_terminate_all(struct dma_chan *chan) +{ + unsigned long flags; + struct coh901318_chan *cohc = to_coh901318_chan(chan); + struct coh901318_desc *cohd; + void __iomem *virtbase = cohc->base->virtbase; + + coh901318_stop(chan); + + spin_lock_irqsave(&cohc->lock, flags); + + /* Clear any pending BE or TC interrupt */ + if (cohc->id < 32) { + writel(1 << cohc->id, virtbase + COH901318_BE_INT_CLEAR1); + writel(1 << cohc->id, virtbase + COH901318_TC_INT_CLEAR1); + } else { + writel(1 << (cohc->id - 32), virtbase + + COH901318_BE_INT_CLEAR2); + writel(1 << (cohc->id - 32), virtbase + + COH901318_TC_INT_CLEAR2); + } + + enable_powersave(cohc); + + while ((cohd = coh901318_first_active_get(cohc))) { + /* release the lli allocation*/ + coh901318_lli_free(&cohc->base->pool, &cohd->data); + + coh901318_desc_remove(cohd); + + /* return desc to free-list */ + coh901318_desc_free(cohc, cohd); + } + + while ((cohd = coh901318_first_queued(cohc))) { + /* release the lli allocation*/ + coh901318_lli_free(&cohc->base->pool, &cohd->data); + + coh901318_desc_remove(cohd); + + /* return desc to free-list */ + coh901318_desc_free(cohc, cohd); + } + + + cohc->nbr_active_done = 0; + cohc->busy = 0; + cohc->pending_irqs = 0; + + spin_unlock_irqrestore(&cohc->lock, flags); +} +void coh901318_base_init(struct dma_device *dma, const int *pick_chans, + struct coh901318_base *base) +{ + int chans_i; + int i = 0; + struct coh901318_chan *cohc; + + INIT_LIST_HEAD(&dma->channels); + + for (chans_i = 0; pick_chans[chans_i] != -1; chans_i += 2) { + for (i = pick_chans[chans_i]; i <= pick_chans[chans_i+1]; i++) { + cohc = &base->chans[i]; + + cohc->base = base; + cohc->chan.device = dma; + cohc->id = i; + + /* TODO: do we really need this lock if only one + * client is connected to each channel? + */ + + spin_lock_init(&cohc->lock); + + cohc->pending_irqs = 0; + cohc->nbr_active_done = 0; + cohc->busy = 0; + INIT_LIST_HEAD(&cohc->free); + INIT_LIST_HEAD(&cohc->active); + INIT_LIST_HEAD(&cohc->queue); + + tasklet_init(&cohc->tasklet, dma_tasklet, + (unsigned long) cohc); + + list_add_tail(&cohc->chan.device_node, + &dma->channels); + } + } +} + +static int __init coh901318_probe(struct platform_device *pdev) +{ + int err = 0; + struct coh901318_platform *pdata; + struct coh901318_base *base; + int irq; + struct resource *io; + + io = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!io) + goto err_get_resource; + + /* Map DMA controller registers to virtual memory */ + if (request_mem_region(io->start, + resource_size(io), + pdev->dev.driver->name) == NULL) { + err = -EBUSY; + goto err_request_mem; + } + + pdata = pdev->dev.platform_data; + if (!pdata) + goto err_no_platformdata; + + base = kmalloc(ALIGN(sizeof(struct coh901318_base), 4) + + pdata->max_channels * + sizeof(struct coh901318_chan), + GFP_KERNEL); + if (!base) + goto err_alloc_coh_dma_channels; + + base->chans = ((void *)base) + ALIGN(sizeof(struct coh901318_base), 4); + + base->virtbase = ioremap(io->start, resource_size(io)); + if (!base->virtbase) { + err = -ENOMEM; + goto err_no_ioremap; + } + + base->dev = &pdev->dev; + base->platform = pdata; + spin_lock_init(&base->pm.lock); + base->pm.started_channels = 0; + + COH901318_DEBUGFS_ASSIGN(debugfs_dma_base, base); + + platform_set_drvdata(pdev, base); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + goto err_no_irq; + + err = request_irq(irq, dma_irq_handler, IRQF_DISABLED, + "coh901318", base); + if (err) { + dev_crit(&pdev->dev, + "Cannot allocate IRQ for DMA controller!\n"); + goto err_request_irq; + } + + err = coh901318_pool_create(&base->pool, &pdev->dev, + sizeof(struct coh901318_lli), + 32); + if (err) + goto err_pool_create; + + /* init channels for device transfers */ + coh901318_base_init(&base->dma_slave, base->platform->chans_slave, + base); + + dma_cap_zero(base->dma_slave.cap_mask); + dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask); + + base->dma_slave.device_alloc_chan_resources = coh901318_alloc_chan_resources; + base->dma_slave.device_free_chan_resources = coh901318_free_chan_resources; + base->dma_slave.device_prep_slave_sg = coh901318_prep_slave_sg; + base->dma_slave.device_is_tx_complete = coh901318_is_tx_complete; + base->dma_slave.device_issue_pending = coh901318_issue_pending; + base->dma_slave.device_terminate_all = coh901318_terminate_all; + base->dma_slave.dev = &pdev->dev; + + err = dma_async_device_register(&base->dma_slave); + + if (err) + goto err_register_slave; + + /* init channels for memcpy */ + coh901318_base_init(&base->dma_memcpy, base->platform->chans_memcpy, + base); + + dma_cap_zero(base->dma_memcpy.cap_mask); + dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask); + + base->dma_memcpy.device_alloc_chan_resources = coh901318_alloc_chan_resources; + base->dma_memcpy.device_free_chan_resources = coh901318_free_chan_resources; + base->dma_memcpy.device_prep_dma_memcpy = coh901318_prep_memcpy; + base->dma_memcpy.device_is_tx_complete = coh901318_is_tx_complete; + base->dma_memcpy.device_issue_pending = coh901318_issue_pending; + base->dma_memcpy.device_terminate_all = coh901318_terminate_all; + base->dma_memcpy.dev = &pdev->dev; + err = dma_async_device_register(&base->dma_memcpy); + + if (err) + goto err_register_memcpy; + + dev_dbg(&pdev->dev, "Initialized COH901318 DMA on virtual base 0x%08x\n", + (u32) base->virtbase); + + return err; + + err_register_memcpy: + dma_async_device_unregister(&base->dma_slave); + err_register_slave: + coh901318_pool_destroy(&base->pool); + err_pool_create: + free_irq(platform_get_irq(pdev, 0), base); + err_request_irq: + err_no_irq: + iounmap(base->virtbase); + err_no_ioremap: + kfree(base); + err_alloc_coh_dma_channels: + err_no_platformdata: + release_mem_region(pdev->resource->start, + resource_size(pdev->resource)); + err_request_mem: + err_get_resource: + return err; +} + +static int __exit coh901318_remove(struct platform_device *pdev) +{ + struct coh901318_base *base = platform_get_drvdata(pdev); + + dma_async_device_unregister(&base->dma_memcpy); + dma_async_device_unregister(&base->dma_slave); + coh901318_pool_destroy(&base->pool); + free_irq(platform_get_irq(pdev, 0), base); + kfree(base); + iounmap(base->virtbase); + release_mem_region(pdev->resource->start, + resource_size(pdev->resource)); + return 0; +} + + +static struct platform_driver coh901318_driver = { + .remove = __exit_p(coh901318_remove), + .driver = { + .name = "coh901318", + }, +}; + +int __init coh901318_init(void) +{ + return platform_driver_probe(&coh901318_driver, coh901318_probe); +} +subsys_initcall(coh901318_init); + +void __exit coh901318_exit(void) +{ + platform_driver_unregister(&coh901318_driver); +} +module_exit(coh901318_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Per Friden"); diff --git a/drivers/dma/coh901318_lli.c b/drivers/dma/coh901318_lli.c new file mode 100644 index 000000000000..f5120f238a4d --- /dev/null +++ b/drivers/dma/coh901318_lli.c @@ -0,0 +1,318 @@ +/* + * driver/dma/coh901318_lli.c + * + * Copyright (C) 2007-2009 ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + * Support functions for handling lli for dma + * Author: Per Friden <per.friden@stericsson.com> + */ + +#include <linux/dma-mapping.h> +#include <linux/spinlock.h> +#include <linux/dmapool.h> +#include <linux/memory.h> +#include <mach/coh901318.h> + +#include "coh901318_lli.h" + +#if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_U300_DEBUG)) +#define DEBUGFS_POOL_COUNTER_RESET(pool) (pool->debugfs_pool_counter = 0) +#define DEBUGFS_POOL_COUNTER_ADD(pool, add) (pool->debugfs_pool_counter += add) +#else +#define DEBUGFS_POOL_COUNTER_RESET(pool) +#define DEBUGFS_POOL_COUNTER_ADD(pool, add) +#endif + +static struct coh901318_lli * +coh901318_lli_next(struct coh901318_lli *data) +{ + if (data == NULL || data->link_addr == 0) + return NULL; + + return (struct coh901318_lli *) data->virt_link_addr; +} + +int coh901318_pool_create(struct coh901318_pool *pool, + struct device *dev, + size_t size, size_t align) +{ + spin_lock_init(&pool->lock); + pool->dev = dev; + pool->dmapool = dma_pool_create("lli_pool", dev, size, align, 0); + + DEBUGFS_POOL_COUNTER_RESET(pool); + return 0; +} + +int coh901318_pool_destroy(struct coh901318_pool *pool) +{ + + dma_pool_destroy(pool->dmapool); + return 0; +} + +struct coh901318_lli * +coh901318_lli_alloc(struct coh901318_pool *pool, unsigned int len) +{ + int i; + struct coh901318_lli *head; + struct coh901318_lli *lli; + struct coh901318_lli *lli_prev; + dma_addr_t phy; + + if (len == 0) + goto err; + + spin_lock(&pool->lock); + + head = dma_pool_alloc(pool->dmapool, GFP_NOWAIT, &phy); + + if (head == NULL) + goto err; + + DEBUGFS_POOL_COUNTER_ADD(pool, 1); + + lli = head; + lli->phy_this = phy; + + for (i = 1; i < len; i++) { + lli_prev = lli; + + lli = dma_pool_alloc(pool->dmapool, GFP_NOWAIT, &phy); + + if (lli == NULL) + goto err_clean_up; + + DEBUGFS_POOL_COUNTER_ADD(pool, 1); + lli->phy_this = phy; + + lli_prev->link_addr = phy; + lli_prev->virt_link_addr = lli; + } + + lli->link_addr = 0x00000000U; + + spin_unlock(&pool->lock); + + return head; + + err: + spin_unlock(&pool->lock); + return NULL; + + err_clean_up: + lli_prev->link_addr = 0x00000000U; + spin_unlock(&pool->lock); + coh901318_lli_free(pool, &head); + return NULL; +} + +void coh901318_lli_free(struct coh901318_pool *pool, + struct coh901318_lli **lli) +{ + struct coh901318_lli *l; + struct coh901318_lli *next; + + if (lli == NULL) + return; + + l = *lli; + + if (l == NULL) + return; + + spin_lock(&pool->lock); + + while (l->link_addr) { + next = l->virt_link_addr; + dma_pool_free(pool->dmapool, l, l->phy_this); + DEBUGFS_POOL_COUNTER_ADD(pool, -1); + l = next; + } + dma_pool_free(pool->dmapool, l, l->phy_this); + DEBUGFS_POOL_COUNTER_ADD(pool, -1); + + spin_unlock(&pool->lock); + *lli = NULL; +} + +int +coh901318_lli_fill_memcpy(struct coh901318_pool *pool, + struct coh901318_lli *lli, + dma_addr_t source, unsigned int size, + dma_addr_t destination, u32 ctrl_chained, + u32 ctrl_eom) +{ + int s = size; + dma_addr_t src = source; + dma_addr_t dst = destination; + + lli->src_addr = src; + lli->dst_addr = dst; + + while (lli->link_addr) { + lli->control = ctrl_chained | MAX_DMA_PACKET_SIZE; + lli->src_addr = src; + lli->dst_addr = dst; + + s -= MAX_DMA_PACKET_SIZE; + lli = coh901318_lli_next(lli); + + src += MAX_DMA_PACKET_SIZE; + dst += MAX_DMA_PACKET_SIZE; + } + + lli->control = ctrl_eom | s; + lli->src_addr = src; + lli->dst_addr = dst; + + /* One irq per single transfer */ + return 1; +} + +int +coh901318_lli_fill_single(struct coh901318_pool *pool, + struct coh901318_lli *lli, + dma_addr_t buf, unsigned int size, + dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl_eom, + enum dma_data_direction dir) +{ + int s = size; + dma_addr_t src; + dma_addr_t dst; + + + if (dir == DMA_TO_DEVICE) { + src = buf; + dst = dev_addr; + + } else if (dir == DMA_FROM_DEVICE) { + + src = dev_addr; + dst = buf; + } else { + return -EINVAL; + } + + while (lli->link_addr) { + size_t block_size = MAX_DMA_PACKET_SIZE; + lli->control = ctrl_chained | MAX_DMA_PACKET_SIZE; + + /* If we are on the next-to-final block and there will + * be less than half a DMA packet left for the last + * block, then we want to make this block a little + * smaller to balance the sizes. This is meant to + * avoid too small transfers if the buffer size is + * (MAX_DMA_PACKET_SIZE*N + 1) */ + if (s < (MAX_DMA_PACKET_SIZE + MAX_DMA_PACKET_SIZE/2)) + block_size = MAX_DMA_PACKET_SIZE/2; + + s -= block_size; + lli->src_addr = src; + lli->dst_addr = dst; + + lli = coh901318_lli_next(lli); + + if (dir == DMA_TO_DEVICE) + src += block_size; + else if (dir == DMA_FROM_DEVICE) + dst += block_size; + } + + lli->control = ctrl_eom | s; + lli->src_addr = src; + lli->dst_addr = dst; + + /* One irq per single transfer */ + return 1; +} + +int +coh901318_lli_fill_sg(struct coh901318_pool *pool, + struct coh901318_lli *lli, + struct scatterlist *sgl, unsigned int nents, + dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl, + u32 ctrl_last, + enum dma_data_direction dir, u32 ctrl_irq_mask) +{ + int i; + struct scatterlist *sg; + u32 ctrl_sg; + dma_addr_t src = 0; + dma_addr_t dst = 0; + int nbr_of_irq = 0; + u32 bytes_to_transfer; + u32 elem_size; + + if (lli == NULL) + goto err; + + spin_lock(&pool->lock); + + if (dir == DMA_TO_DEVICE) + dst = dev_addr; + else if (dir == DMA_FROM_DEVICE) + src = dev_addr; + else + goto err; + + for_each_sg(sgl, sg, nents, i) { + if (sg_is_chain(sg)) { + /* sg continues to the next sg-element don't + * send ctrl_finish until the last + * sg-element in the chain + */ + ctrl_sg = ctrl_chained; + } else if (i == nents - 1) + ctrl_sg = ctrl_last; + else + ctrl_sg = ctrl ? ctrl : ctrl_last; + + + if ((ctrl_sg & ctrl_irq_mask)) + nbr_of_irq++; + + if (dir == DMA_TO_DEVICE) + /* increment source address */ + src = sg_dma_address(sg); + else + /* increment destination address */ + dst = sg_dma_address(sg); + + bytes_to_transfer = sg_dma_len(sg); + + while (bytes_to_transfer) { + u32 val; + + if (bytes_to_transfer > MAX_DMA_PACKET_SIZE) { + elem_size = MAX_DMA_PACKET_SIZE; + val = ctrl_chained; + } else { + elem_size = bytes_to_transfer; + val = ctrl_sg; + } + + lli->control = val | elem_size; + lli->src_addr = src; + lli->dst_addr = dst; + + if (dir == DMA_FROM_DEVICE) + dst += elem_size; + else + src += elem_size; + + BUG_ON(lli->link_addr & 3); + + bytes_to_transfer -= elem_size; + lli = coh901318_lli_next(lli); + } + + } + spin_unlock(&pool->lock); + + /* There can be many IRQs per sg transfer */ + return nbr_of_irq; + err: + spin_unlock(&pool->lock); + return -EINVAL; +} diff --git a/drivers/dma/coh901318_lli.h b/drivers/dma/coh901318_lli.h new file mode 100644 index 000000000000..7bf713b79c6b --- /dev/null +++ b/drivers/dma/coh901318_lli.h @@ -0,0 +1,124 @@ +/* + * driver/dma/coh901318_lli.h + * + * Copyright (C) 2007-2009 ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + * Support functions for handling lli for coh901318 + * Author: Per Friden <per.friden@stericsson.com> + */ + +#ifndef COH901318_LLI_H +#define COH901318_LLI_H + +#include <mach/coh901318.h> + +struct device; + +struct coh901318_pool { + spinlock_t lock; + struct dma_pool *dmapool; + struct device *dev; + +#ifdef CONFIG_DEBUG_FS + int debugfs_pool_counter; +#endif +}; + +struct device; +/** + * coh901318_pool_create() - Creates an dma pool for lli:s + * @pool: pool handle + * @dev: dma device + * @lli_nbr: number of lli:s in the pool + * @algin: adress alignemtn of lli:s + * returns 0 on success otherwise none zero + */ +int coh901318_pool_create(struct coh901318_pool *pool, + struct device *dev, + size_t lli_nbr, size_t align); + +/** + * coh901318_pool_destroy() - Destroys the dma pool + * @pool: pool handle + * returns 0 on success otherwise none zero + */ +int coh901318_pool_destroy(struct coh901318_pool *pool); + +/** + * coh901318_lli_alloc() - Allocates a linked list + * + * @pool: pool handle + * @len: length to list + * return: none NULL if success otherwise NULL + */ +struct coh901318_lli * +coh901318_lli_alloc(struct coh901318_pool *pool, + unsigned int len); + +/** + * coh901318_lli_free() - Returns the linked list items to the pool + * @pool: pool handle + * @lli: reference to lli pointer to be freed + */ +void coh901318_lli_free(struct coh901318_pool *pool, + struct coh901318_lli **lli); + +/** + * coh901318_lli_fill_memcpy() - Prepares the lli:s for dma memcpy + * @pool: pool handle + * @lli: allocated lli + * @src: src address + * @size: transfer size + * @dst: destination address + * @ctrl_chained: ctrl for chained lli + * @ctrl_last: ctrl for the last lli + * returns number of CPU interrupts for the lli, negative on error. + */ +int +coh901318_lli_fill_memcpy(struct coh901318_pool *pool, + struct coh901318_lli *lli, + dma_addr_t src, unsigned int size, + dma_addr_t dst, u32 ctrl_chained, u32 ctrl_last); + +/** + * coh901318_lli_fill_single() - Prepares the lli:s for dma single transfer + * @pool: pool handle + * @lli: allocated lli + * @buf: transfer buffer + * @size: transfer size + * @dev_addr: address of periphal + * @ctrl_chained: ctrl for chained lli + * @ctrl_last: ctrl for the last lli + * @dir: direction of transfer (to or from device) + * returns number of CPU interrupts for the lli, negative on error. + */ +int +coh901318_lli_fill_single(struct coh901318_pool *pool, + struct coh901318_lli *lli, + dma_addr_t buf, unsigned int size, + dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl_last, + enum dma_data_direction dir); + +/** + * coh901318_lli_fill_single() - Prepares the lli:s for dma scatter list transfer + * @pool: pool handle + * @lli: allocated lli + * @sg: scatter gather list + * @nents: number of entries in sg + * @dev_addr: address of periphal + * @ctrl_chained: ctrl for chained lli + * @ctrl: ctrl of middle lli + * @ctrl_last: ctrl for the last lli + * @dir: direction of transfer (to or from device) + * @ctrl_irq_mask: ctrl mask for CPU interrupt + * returns number of CPU interrupts for the lli, negative on error. + */ +int +coh901318_lli_fill_sg(struct coh901318_pool *pool, + struct coh901318_lli *lli, + struct scatterlist *sg, unsigned int nents, + dma_addr_t dev_addr, u32 ctrl_chained, + u32 ctrl, u32 ctrl_last, + enum dma_data_direction dir, u32 ctrl_irq_mask); + +#endif /* COH901318_LLI_H */ diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index a32a4cf7b1e0..8b905161fbf4 100644 --- a/drivers/dma/dmatest.c +++ b/drivers/dma/dmatest.c @@ -298,10 +298,6 @@ static int dmatest_func(void *data) total_tests++; - len = dmatest_random() % test_buf_size + 1; - src_off = dmatest_random() % (test_buf_size - len + 1); - dst_off = dmatest_random() % (test_buf_size - len + 1); - /* honor alignment restrictions */ if (thread->type == DMA_MEMCPY) align = dev->copy_align; @@ -310,7 +306,19 @@ static int dmatest_func(void *data) else if (thread->type == DMA_PQ) align = dev->pq_align; + if (1 << align > test_buf_size) { + pr_err("%u-byte buffer too small for %d-byte alignment\n", + test_buf_size, 1 << align); + break; + } + + len = dmatest_random() % test_buf_size + 1; len = (len >> align) << align; + if (!len) + len = 1 << align; + src_off = dmatest_random() % (test_buf_size - len + 1); + dst_off = dmatest_random() % (test_buf_size - len + 1); + src_off = (src_off >> align) << align; dst_off = (dst_off >> align) << align; diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c index 645ca8d54ec4..ca6e6a0cb793 100644 --- a/drivers/dma/iop-adma.c +++ b/drivers/dma/iop-adma.c @@ -1470,7 +1470,7 @@ static int __devinit iop_adma_probe(struct platform_device *pdev) return -ENODEV; if (!devm_request_mem_region(&pdev->dev, res->start, - res->end - res->start, pdev->name)) + resource_size(res), pdev->name)) return -EBUSY; adev = kzalloc(sizeof(*adev), GFP_KERNEL); @@ -1542,7 +1542,7 @@ static int __devinit iop_adma_probe(struct platform_device *pdev) iop_chan->device = adev; iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start, - res->end - res->start); + resource_size(res)); if (!iop_chan->mmr_base) { ret = -ENOMEM; goto err_free_iop_chan; diff --git a/drivers/dma/ppc4xx/Makefile b/drivers/dma/ppc4xx/Makefile new file mode 100644 index 000000000000..b3d259b3e52a --- /dev/null +++ b/drivers/dma/ppc4xx/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_AMCC_PPC440SPE_ADMA) += adma.o diff --git a/drivers/dma/ppc4xx/adma.c b/drivers/dma/ppc4xx/adma.c new file mode 100644 index 000000000000..0a3478e910f0 --- /dev/null +++ b/drivers/dma/ppc4xx/adma.c @@ -0,0 +1,5027 @@ +/* + * Copyright (C) 2006-2009 DENX Software Engineering. + * + * Author: Yuri Tikhonov <yur@emcraft.com> + * + * Further porting to arch/powerpc by + * Anatolij Gustschin <agust@denx.de> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ + +/* + * This driver supports the asynchrounous DMA copy and RAID engines available + * on the AMCC PPC440SPe Processors. + * Based on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x) + * ADMA driver written by D.Williams. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/async_tx.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/uaccess.h> +#include <linux/proc_fs.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <asm/dcr.h> +#include <asm/dcr-regs.h> +#include "adma.h" + +enum ppc_adma_init_code { + PPC_ADMA_INIT_OK = 0, + PPC_ADMA_INIT_MEMRES, + PPC_ADMA_INIT_MEMREG, + PPC_ADMA_INIT_ALLOC, + PPC_ADMA_INIT_COHERENT, + PPC_ADMA_INIT_CHANNEL, + PPC_ADMA_INIT_IRQ1, + PPC_ADMA_INIT_IRQ2, + PPC_ADMA_INIT_REGISTER +}; + +static char *ppc_adma_errors[] = { + [PPC_ADMA_INIT_OK] = "ok", + [PPC_ADMA_INIT_MEMRES] = "failed to get memory resource", + [PPC_ADMA_INIT_MEMREG] = "failed to request memory region", + [PPC_ADMA_INIT_ALLOC] = "failed to allocate memory for adev " + "structure", + [PPC_ADMA_INIT_COHERENT] = "failed to allocate coherent memory for " + "hardware descriptors", + [PPC_ADMA_INIT_CHANNEL] = "failed to allocate memory for channel", + [PPC_ADMA_INIT_IRQ1] = "failed to request first irq", + [PPC_ADMA_INIT_IRQ2] = "failed to request second irq", + [PPC_ADMA_INIT_REGISTER] = "failed to register dma async device", +}; + +static enum ppc_adma_init_code +ppc440spe_adma_devices[PPC440SPE_ADMA_ENGINES_NUM]; + +struct ppc_dma_chan_ref { + struct dma_chan *chan; + struct list_head node; +}; + +/* The list of channels exported by ppc440spe ADMA */ +struct list_head +ppc440spe_adma_chan_list = LIST_HEAD_INIT(ppc440spe_adma_chan_list); + +/* This flag is set when want to refetch the xor chain in the interrupt + * handler + */ +static u32 do_xor_refetch; + +/* Pointer to DMA0, DMA1 CP/CS FIFO */ +static void *ppc440spe_dma_fifo_buf; + +/* Pointers to last submitted to DMA0, DMA1 CDBs */ +static struct ppc440spe_adma_desc_slot *chan_last_sub[3]; +static struct ppc440spe_adma_desc_slot *chan_first_cdb[3]; + +/* Pointer to last linked and submitted xor CB */ +static struct ppc440spe_adma_desc_slot *xor_last_linked; +static struct ppc440spe_adma_desc_slot *xor_last_submit; + +/* This array is used in data-check operations for storing a pattern */ +static char ppc440spe_qword[16]; + +static atomic_t ppc440spe_adma_err_irq_ref; +static dcr_host_t ppc440spe_mq_dcr_host; +static unsigned int ppc440spe_mq_dcr_len; + +/* Since RXOR operations use the common register (MQ0_CF2H) for setting-up + * the block size in transactions, then we do not allow to activate more than + * only one RXOR transactions simultaneously. So use this var to store + * the information about is RXOR currently active (PPC440SPE_RXOR_RUN bit is + * set) or not (PPC440SPE_RXOR_RUN is clear). + */ +static unsigned long ppc440spe_rxor_state; + +/* These are used in enable & check routines + */ +static u32 ppc440spe_r6_enabled; +static struct ppc440spe_adma_chan *ppc440spe_r6_tchan; +static struct completion ppc440spe_r6_test_comp; + +static int ppc440spe_adma_dma2rxor_prep_src( + struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_rxor *cursor, int index, + int src_cnt, u32 addr); +static void ppc440spe_adma_dma2rxor_set_src( + struct ppc440spe_adma_desc_slot *desc, + int index, dma_addr_t addr); +static void ppc440spe_adma_dma2rxor_set_mult( + struct ppc440spe_adma_desc_slot *desc, + int index, u8 mult); + +#ifdef ADMA_LL_DEBUG +#define ADMA_LL_DBG(x) ({ if (1) x; 0; }) +#else +#define ADMA_LL_DBG(x) ({ if (0) x; 0; }) +#endif + +static void print_cb(struct ppc440spe_adma_chan *chan, void *block) +{ + struct dma_cdb *cdb; + struct xor_cb *cb; + int i; + + switch (chan->device->id) { + case 0: + case 1: + cdb = block; + + pr_debug("CDB at %p [%d]:\n" + "\t attr 0x%02x opc 0x%02x cnt 0x%08x\n" + "\t sg1u 0x%08x sg1l 0x%08x\n" + "\t sg2u 0x%08x sg2l 0x%08x\n" + "\t sg3u 0x%08x sg3l 0x%08x\n", + cdb, chan->device->id, + cdb->attr, cdb->opc, le32_to_cpu(cdb->cnt), + le32_to_cpu(cdb->sg1u), le32_to_cpu(cdb->sg1l), + le32_to_cpu(cdb->sg2u), le32_to_cpu(cdb->sg2l), + le32_to_cpu(cdb->sg3u), le32_to_cpu(cdb->sg3l) + ); + break; + case 2: + cb = block; + + pr_debug("CB at %p [%d]:\n" + "\t cbc 0x%08x cbbc 0x%08x cbs 0x%08x\n" + "\t cbtah 0x%08x cbtal 0x%08x\n" + "\t cblah 0x%08x cblal 0x%08x\n", + cb, chan->device->id, + cb->cbc, cb->cbbc, cb->cbs, + cb->cbtah, cb->cbtal, + cb->cblah, cb->cblal); + for (i = 0; i < 16; i++) { + if (i && !cb->ops[i].h && !cb->ops[i].l) + continue; + pr_debug("\t ops[%2d]: h 0x%08x l 0x%08x\n", + i, cb->ops[i].h, cb->ops[i].l); + } + break; + } +} + +static void print_cb_list(struct ppc440spe_adma_chan *chan, + struct ppc440spe_adma_desc_slot *iter) +{ + for (; iter; iter = iter->hw_next) + print_cb(chan, iter->hw_desc); +} + +static void prep_dma_xor_dbg(int id, dma_addr_t dst, dma_addr_t *src, + unsigned int src_cnt) +{ + int i; + + pr_debug("\n%s(%d):\nsrc: ", __func__, id); + for (i = 0; i < src_cnt; i++) + pr_debug("\t0x%016llx ", src[i]); + pr_debug("dst:\n\t0x%016llx\n", dst); +} + +static void prep_dma_pq_dbg(int id, dma_addr_t *dst, dma_addr_t *src, + unsigned int src_cnt) +{ + int i; + + pr_debug("\n%s(%d):\nsrc: ", __func__, id); + for (i = 0; i < src_cnt; i++) + pr_debug("\t0x%016llx ", src[i]); + pr_debug("dst: "); + for (i = 0; i < 2; i++) + pr_debug("\t0x%016llx ", dst[i]); +} + +static void prep_dma_pqzero_sum_dbg(int id, dma_addr_t *src, + unsigned int src_cnt, + const unsigned char *scf) +{ + int i; + + pr_debug("\n%s(%d):\nsrc(coef): ", __func__, id); + if (scf) { + for (i = 0; i < src_cnt; i++) + pr_debug("\t0x%016llx(0x%02x) ", src[i], scf[i]); + } else { + for (i = 0; i < src_cnt; i++) + pr_debug("\t0x%016llx(no) ", src[i]); + } + + pr_debug("dst: "); + for (i = 0; i < 2; i++) + pr_debug("\t0x%016llx ", src[src_cnt + i]); +} + +/****************************************************************************** + * Command (Descriptor) Blocks low-level routines + ******************************************************************************/ +/** + * ppc440spe_desc_init_interrupt - initialize the descriptor for INTERRUPT + * pseudo operation + */ +static void ppc440spe_desc_init_interrupt(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan) +{ + struct xor_cb *p; + + switch (chan->device->id) { + case PPC440SPE_XOR_ID: + p = desc->hw_desc; + memset(desc->hw_desc, 0, sizeof(struct xor_cb)); + /* NOP with Command Block Complete Enable */ + p->cbc = XOR_CBCR_CBCE_BIT; + break; + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + memset(desc->hw_desc, 0, sizeof(struct dma_cdb)); + /* NOP with interrupt */ + set_bit(PPC440SPE_DESC_INT, &desc->flags); + break; + default: + printk(KERN_ERR "Unsupported id %d in %s\n", chan->device->id, + __func__); + break; + } +} + +/** + * ppc440spe_desc_init_null_xor - initialize the descriptor for NULL XOR + * pseudo operation + */ +static void ppc440spe_desc_init_null_xor(struct ppc440spe_adma_desc_slot *desc) +{ + memset(desc->hw_desc, 0, sizeof(struct xor_cb)); + desc->hw_next = NULL; + desc->src_cnt = 0; + desc->dst_cnt = 1; +} + +/** + * ppc440spe_desc_init_xor - initialize the descriptor for XOR operation + */ +static void ppc440spe_desc_init_xor(struct ppc440spe_adma_desc_slot *desc, + int src_cnt, unsigned long flags) +{ + struct xor_cb *hw_desc = desc->hw_desc; + + memset(desc->hw_desc, 0, sizeof(struct xor_cb)); + desc->hw_next = NULL; + desc->src_cnt = src_cnt; + desc->dst_cnt = 1; + + hw_desc->cbc = XOR_CBCR_TGT_BIT | src_cnt; + if (flags & DMA_PREP_INTERRUPT) + /* Enable interrupt on completion */ + hw_desc->cbc |= XOR_CBCR_CBCE_BIT; +} + +/** + * ppc440spe_desc_init_dma2pq - initialize the descriptor for PQ + * operation in DMA2 controller + */ +static void ppc440spe_desc_init_dma2pq(struct ppc440spe_adma_desc_slot *desc, + int dst_cnt, int src_cnt, unsigned long flags) +{ + struct xor_cb *hw_desc = desc->hw_desc; + + memset(desc->hw_desc, 0, sizeof(struct xor_cb)); + desc->hw_next = NULL; + desc->src_cnt = src_cnt; + desc->dst_cnt = dst_cnt; + memset(desc->reverse_flags, 0, sizeof(desc->reverse_flags)); + desc->descs_per_op = 0; + + hw_desc->cbc = XOR_CBCR_TGT_BIT; + if (flags & DMA_PREP_INTERRUPT) + /* Enable interrupt on completion */ + hw_desc->cbc |= XOR_CBCR_CBCE_BIT; +} + +#define DMA_CTRL_FLAGS_LAST DMA_PREP_FENCE +#define DMA_PREP_ZERO_P (DMA_CTRL_FLAGS_LAST << 1) +#define DMA_PREP_ZERO_Q (DMA_PREP_ZERO_P << 1) + +/** + * ppc440spe_desc_init_dma01pq - initialize the descriptors for PQ operation + * with DMA0/1 + */ +static void ppc440spe_desc_init_dma01pq(struct ppc440spe_adma_desc_slot *desc, + int dst_cnt, int src_cnt, unsigned long flags, + unsigned long op) +{ + struct dma_cdb *hw_desc; + struct ppc440spe_adma_desc_slot *iter; + u8 dopc; + + /* Common initialization of a PQ descriptors chain */ + set_bits(op, &desc->flags); + desc->src_cnt = src_cnt; + desc->dst_cnt = dst_cnt; + + /* WXOR MULTICAST if both P and Q are being computed + * MV_SG1_SG2 if Q only + */ + dopc = (desc->dst_cnt == DMA_DEST_MAX_NUM) ? + DMA_CDB_OPC_MULTICAST : DMA_CDB_OPC_MV_SG1_SG2; + + list_for_each_entry(iter, &desc->group_list, chain_node) { + hw_desc = iter->hw_desc; + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + + if (likely(!list_is_last(&iter->chain_node, + &desc->group_list))) { + /* set 'next' pointer */ + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, chain_node); + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + } else { + /* this is the last descriptor. + * this slot will be pasted from ADMA level + * each time it wants to configure parameters + * of the transaction (src, dst, ...) + */ + iter->hw_next = NULL; + if (flags & DMA_PREP_INTERRUPT) + set_bit(PPC440SPE_DESC_INT, &iter->flags); + else + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + } + } + + /* Set OPS depending on WXOR/RXOR type of operation */ + if (!test_bit(PPC440SPE_DESC_RXOR, &desc->flags)) { + /* This is a WXOR only chain: + * - first descriptors are for zeroing destinations + * if PPC440SPE_ZERO_P/Q set; + * - descriptors remained are for GF-XOR operations. + */ + iter = list_first_entry(&desc->group_list, + struct ppc440spe_adma_desc_slot, + chain_node); + + if (test_bit(PPC440SPE_ZERO_P, &desc->flags)) { + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + } + + if (test_bit(PPC440SPE_ZERO_Q, &desc->flags)) { + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + } + + list_for_each_entry_from(iter, &desc->group_list, chain_node) { + hw_desc = iter->hw_desc; + hw_desc->opc = dopc; + } + } else { + /* This is either RXOR-only or mixed RXOR/WXOR */ + + /* The first 1 or 2 slots in chain are always RXOR, + * if need to calculate P & Q, then there are two + * RXOR slots; if only P or only Q, then there is one + */ + iter = list_first_entry(&desc->group_list, + struct ppc440spe_adma_desc_slot, + chain_node); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + + if (desc->dst_cnt == DMA_DEST_MAX_NUM) { + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + } + + /* The remaining descs (if any) are WXORs */ + if (test_bit(PPC440SPE_DESC_WXOR, &desc->flags)) { + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + list_for_each_entry_from(iter, &desc->group_list, + chain_node) { + hw_desc = iter->hw_desc; + hw_desc->opc = dopc; + } + } + } +} + +/** + * ppc440spe_desc_init_dma01pqzero_sum - initialize the descriptor + * for PQ_ZERO_SUM operation + */ +static void ppc440spe_desc_init_dma01pqzero_sum( + struct ppc440spe_adma_desc_slot *desc, + int dst_cnt, int src_cnt) +{ + struct dma_cdb *hw_desc; + struct ppc440spe_adma_desc_slot *iter; + int i = 0; + u8 dopc = (dst_cnt == 2) ? DMA_CDB_OPC_MULTICAST : + DMA_CDB_OPC_MV_SG1_SG2; + /* + * Initialize starting from 2nd or 3rd descriptor dependent + * on dst_cnt. First one or two slots are for cloning P + * and/or Q to chan->pdest and/or chan->qdest as we have + * to preserve original P/Q. + */ + iter = list_first_entry(&desc->group_list, + struct ppc440spe_adma_desc_slot, chain_node); + iter = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, chain_node); + + if (dst_cnt > 1) { + iter = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, chain_node); + } + /* initialize each source descriptor in chain */ + list_for_each_entry_from(iter, &desc->group_list, chain_node) { + hw_desc = iter->hw_desc; + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->src_cnt = 0; + iter->dst_cnt = 0; + + /* This is a ZERO_SUM operation: + * - <src_cnt> descriptors starting from 2nd or 3rd + * descriptor are for GF-XOR operations; + * - remaining <dst_cnt> descriptors are for checking the result + */ + if (i++ < src_cnt) + /* MV_SG1_SG2 if only Q is being verified + * MULTICAST if both P and Q are being verified + */ + hw_desc->opc = dopc; + else + /* DMA_CDB_OPC_DCHECK128 operation */ + hw_desc->opc = DMA_CDB_OPC_DCHECK128; + + if (likely(!list_is_last(&iter->chain_node, + &desc->group_list))) { + /* set 'next' pointer */ + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + } else { + /* this is the last descriptor. + * this slot will be pasted from ADMA level + * each time it wants to configure parameters + * of the transaction (src, dst, ...) + */ + iter->hw_next = NULL; + /* always enable interrupt generation since we get + * the status of pqzero from the handler + */ + set_bit(PPC440SPE_DESC_INT, &iter->flags); + } + } + desc->src_cnt = src_cnt; + desc->dst_cnt = dst_cnt; +} + +/** + * ppc440spe_desc_init_memcpy - initialize the descriptor for MEMCPY operation + */ +static void ppc440spe_desc_init_memcpy(struct ppc440spe_adma_desc_slot *desc, + unsigned long flags) +{ + struct dma_cdb *hw_desc = desc->hw_desc; + + memset(desc->hw_desc, 0, sizeof(struct dma_cdb)); + desc->hw_next = NULL; + desc->src_cnt = 1; + desc->dst_cnt = 1; + + if (flags & DMA_PREP_INTERRUPT) + set_bit(PPC440SPE_DESC_INT, &desc->flags); + else + clear_bit(PPC440SPE_DESC_INT, &desc->flags); + + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; +} + +/** + * ppc440spe_desc_init_memset - initialize the descriptor for MEMSET operation + */ +static void ppc440spe_desc_init_memset(struct ppc440spe_adma_desc_slot *desc, + int value, unsigned long flags) +{ + struct dma_cdb *hw_desc = desc->hw_desc; + + memset(desc->hw_desc, 0, sizeof(struct dma_cdb)); + desc->hw_next = NULL; + desc->src_cnt = 1; + desc->dst_cnt = 1; + + if (flags & DMA_PREP_INTERRUPT) + set_bit(PPC440SPE_DESC_INT, &desc->flags); + else + clear_bit(PPC440SPE_DESC_INT, &desc->flags); + + hw_desc->sg1u = hw_desc->sg1l = cpu_to_le32((u32)value); + hw_desc->sg3u = hw_desc->sg3l = cpu_to_le32((u32)value); + hw_desc->opc = DMA_CDB_OPC_DFILL128; +} + +/** + * ppc440spe_desc_set_src_addr - set source address into the descriptor + */ +static void ppc440spe_desc_set_src_addr(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, + int src_idx, dma_addr_t addrh, + dma_addr_t addrl) +{ + struct dma_cdb *dma_hw_desc; + struct xor_cb *xor_hw_desc; + phys_addr_t addr64, tmplow, tmphi; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + if (!addrh) { + addr64 = addrl; + tmphi = (addr64 >> 32); + tmplow = (addr64 & 0xFFFFFFFF); + } else { + tmphi = addrh; + tmplow = addrl; + } + dma_hw_desc = desc->hw_desc; + dma_hw_desc->sg1l = cpu_to_le32((u32)tmplow); + dma_hw_desc->sg1u |= cpu_to_le32((u32)tmphi); + break; + case PPC440SPE_XOR_ID: + xor_hw_desc = desc->hw_desc; + xor_hw_desc->ops[src_idx].l = addrl; + xor_hw_desc->ops[src_idx].h |= addrh; + break; + } +} + +/** + * ppc440spe_desc_set_src_mult - set source address mult into the descriptor + */ +static void ppc440spe_desc_set_src_mult(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, u32 mult_index, + int sg_index, unsigned char mult_value) +{ + struct dma_cdb *dma_hw_desc; + struct xor_cb *xor_hw_desc; + u32 *psgu; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_hw_desc = desc->hw_desc; + + switch (sg_index) { + /* for RXOR operations set multiplier + * into source cued address + */ + case DMA_CDB_SG_SRC: + psgu = &dma_hw_desc->sg1u; + break; + /* for WXOR operations set multiplier + * into destination cued address(es) + */ + case DMA_CDB_SG_DST1: + psgu = &dma_hw_desc->sg2u; + break; + case DMA_CDB_SG_DST2: + psgu = &dma_hw_desc->sg3u; + break; + default: + BUG(); + } + + *psgu |= cpu_to_le32(mult_value << mult_index); + break; + case PPC440SPE_XOR_ID: + xor_hw_desc = desc->hw_desc; + break; + default: + BUG(); + } +} + +/** + * ppc440spe_desc_set_dest_addr - set destination address into the descriptor + */ +static void ppc440spe_desc_set_dest_addr(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, + dma_addr_t addrh, dma_addr_t addrl, + u32 dst_idx) +{ + struct dma_cdb *dma_hw_desc; + struct xor_cb *xor_hw_desc; + phys_addr_t addr64, tmphi, tmplow; + u32 *psgu, *psgl; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + if (!addrh) { + addr64 = addrl; + tmphi = (addr64 >> 32); + tmplow = (addr64 & 0xFFFFFFFF); + } else { + tmphi = addrh; + tmplow = addrl; + } + dma_hw_desc = desc->hw_desc; + + psgu = dst_idx ? &dma_hw_desc->sg3u : &dma_hw_desc->sg2u; + psgl = dst_idx ? &dma_hw_desc->sg3l : &dma_hw_desc->sg2l; + + *psgl = cpu_to_le32((u32)tmplow); + *psgu |= cpu_to_le32((u32)tmphi); + break; + case PPC440SPE_XOR_ID: + xor_hw_desc = desc->hw_desc; + xor_hw_desc->cbtal = addrl; + xor_hw_desc->cbtah |= addrh; + break; + } +} + +/** + * ppc440spe_desc_set_byte_count - set number of data bytes involved + * into the operation + */ +static void ppc440spe_desc_set_byte_count(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, + u32 byte_count) +{ + struct dma_cdb *dma_hw_desc; + struct xor_cb *xor_hw_desc; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_hw_desc = desc->hw_desc; + dma_hw_desc->cnt = cpu_to_le32(byte_count); + break; + case PPC440SPE_XOR_ID: + xor_hw_desc = desc->hw_desc; + xor_hw_desc->cbbc = byte_count; + break; + } +} + +/** + * ppc440spe_desc_set_rxor_block_size - set RXOR block size + */ +static inline void ppc440spe_desc_set_rxor_block_size(u32 byte_count) +{ + /* assume that byte_count is aligned on the 512-boundary; + * thus write it directly to the register (bits 23:31 are + * reserved there). + */ + dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CF2H, byte_count); +} + +/** + * ppc440spe_desc_set_dcheck - set CHECK pattern + */ +static void ppc440spe_desc_set_dcheck(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, u8 *qword) +{ + struct dma_cdb *dma_hw_desc; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_hw_desc = desc->hw_desc; + iowrite32(qword[0], &dma_hw_desc->sg3l); + iowrite32(qword[4], &dma_hw_desc->sg3u); + iowrite32(qword[8], &dma_hw_desc->sg2l); + iowrite32(qword[12], &dma_hw_desc->sg2u); + break; + default: + BUG(); + } +} + +/** + * ppc440spe_xor_set_link - set link address in xor CB + */ +static void ppc440spe_xor_set_link(struct ppc440spe_adma_desc_slot *prev_desc, + struct ppc440spe_adma_desc_slot *next_desc) +{ + struct xor_cb *xor_hw_desc = prev_desc->hw_desc; + + if (unlikely(!next_desc || !(next_desc->phys))) { + printk(KERN_ERR "%s: next_desc=0x%p; next_desc->phys=0x%llx\n", + __func__, next_desc, + next_desc ? next_desc->phys : 0); + BUG(); + } + + xor_hw_desc->cbs = 0; + xor_hw_desc->cblal = next_desc->phys; + xor_hw_desc->cblah = 0; + xor_hw_desc->cbc |= XOR_CBCR_LNK_BIT; +} + +/** + * ppc440spe_desc_set_link - set the address of descriptor following this + * descriptor in chain + */ +static void ppc440spe_desc_set_link(struct ppc440spe_adma_chan *chan, + struct ppc440spe_adma_desc_slot *prev_desc, + struct ppc440spe_adma_desc_slot *next_desc) +{ + unsigned long flags; + struct ppc440spe_adma_desc_slot *tail = next_desc; + + if (unlikely(!prev_desc || !next_desc || + (prev_desc->hw_next && prev_desc->hw_next != next_desc))) { + /* If previous next is overwritten something is wrong. + * though we may refetch from append to initiate list + * processing; in this case - it's ok. + */ + printk(KERN_ERR "%s: prev_desc=0x%p; next_desc=0x%p; " + "prev->hw_next=0x%p\n", __func__, prev_desc, + next_desc, prev_desc ? prev_desc->hw_next : 0); + BUG(); + } + + local_irq_save(flags); + + /* do s/w chaining both for DMA and XOR descriptors */ + prev_desc->hw_next = next_desc; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + break; + case PPC440SPE_XOR_ID: + /* bind descriptor to the chain */ + while (tail->hw_next) + tail = tail->hw_next; + xor_last_linked = tail; + + if (prev_desc == xor_last_submit) + /* do not link to the last submitted CB */ + break; + ppc440spe_xor_set_link(prev_desc, next_desc); + break; + } + + local_irq_restore(flags); +} + +/** + * ppc440spe_desc_get_src_addr - extract the source address from the descriptor + */ +static u32 ppc440spe_desc_get_src_addr(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, int src_idx) +{ + struct dma_cdb *dma_hw_desc; + struct xor_cb *xor_hw_desc; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_hw_desc = desc->hw_desc; + /* May have 0, 1, 2, or 3 sources */ + switch (dma_hw_desc->opc) { + case DMA_CDB_OPC_NO_OP: + case DMA_CDB_OPC_DFILL128: + return 0; + case DMA_CDB_OPC_DCHECK128: + if (unlikely(src_idx)) { + printk(KERN_ERR "%s: try to get %d source for" + " DCHECK128\n", __func__, src_idx); + BUG(); + } + return le32_to_cpu(dma_hw_desc->sg1l); + case DMA_CDB_OPC_MULTICAST: + case DMA_CDB_OPC_MV_SG1_SG2: + if (unlikely(src_idx > 2)) { + printk(KERN_ERR "%s: try to get %d source from" + " DMA descr\n", __func__, src_idx); + BUG(); + } + if (src_idx) { + if (le32_to_cpu(dma_hw_desc->sg1u) & + DMA_CUED_XOR_WIN_MSK) { + u8 region; + + if (src_idx == 1) + return le32_to_cpu( + dma_hw_desc->sg1l) + + desc->unmap_len; + + region = (le32_to_cpu( + dma_hw_desc->sg1u)) >> + DMA_CUED_REGION_OFF; + + region &= DMA_CUED_REGION_MSK; + switch (region) { + case DMA_RXOR123: + return le32_to_cpu( + dma_hw_desc->sg1l) + + (desc->unmap_len << 1); + case DMA_RXOR124: + return le32_to_cpu( + dma_hw_desc->sg1l) + + (desc->unmap_len * 3); + case DMA_RXOR125: + return le32_to_cpu( + dma_hw_desc->sg1l) + + (desc->unmap_len << 2); + default: + printk(KERN_ERR + "%s: try to" + " get src3 for region %02x" + "PPC440SPE_DESC_RXOR12?\n", + __func__, region); + BUG(); + } + } else { + printk(KERN_ERR + "%s: try to get %d" + " source for non-cued descr\n", + __func__, src_idx); + BUG(); + } + } + return le32_to_cpu(dma_hw_desc->sg1l); + default: + printk(KERN_ERR "%s: unknown OPC 0x%02x\n", + __func__, dma_hw_desc->opc); + BUG(); + } + return le32_to_cpu(dma_hw_desc->sg1l); + case PPC440SPE_XOR_ID: + /* May have up to 16 sources */ + xor_hw_desc = desc->hw_desc; + return xor_hw_desc->ops[src_idx].l; + } + return 0; +} + +/** + * ppc440spe_desc_get_dest_addr - extract the destination address from the + * descriptor + */ +static u32 ppc440spe_desc_get_dest_addr(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, int idx) +{ + struct dma_cdb *dma_hw_desc; + struct xor_cb *xor_hw_desc; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_hw_desc = desc->hw_desc; + + if (likely(!idx)) + return le32_to_cpu(dma_hw_desc->sg2l); + return le32_to_cpu(dma_hw_desc->sg3l); + case PPC440SPE_XOR_ID: + xor_hw_desc = desc->hw_desc; + return xor_hw_desc->cbtal; + } + return 0; +} + +/** + * ppc440spe_desc_get_src_num - extract the number of source addresses from + * the descriptor + */ +static u32 ppc440spe_desc_get_src_num(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan) +{ + struct dma_cdb *dma_hw_desc; + struct xor_cb *xor_hw_desc; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_hw_desc = desc->hw_desc; + + switch (dma_hw_desc->opc) { + case DMA_CDB_OPC_NO_OP: + case DMA_CDB_OPC_DFILL128: + return 0; + case DMA_CDB_OPC_DCHECK128: + return 1; + case DMA_CDB_OPC_MV_SG1_SG2: + case DMA_CDB_OPC_MULTICAST: + /* + * Only for RXOR operations we have more than + * one source + */ + if (le32_to_cpu(dma_hw_desc->sg1u) & + DMA_CUED_XOR_WIN_MSK) { + /* RXOR op, there are 2 or 3 sources */ + if (((le32_to_cpu(dma_hw_desc->sg1u) >> + DMA_CUED_REGION_OFF) & + DMA_CUED_REGION_MSK) == DMA_RXOR12) { + /* RXOR 1-2 */ + return 2; + } else { + /* RXOR 1-2-3/1-2-4/1-2-5 */ + return 3; + } + } + return 1; + default: + printk(KERN_ERR "%s: unknown OPC 0x%02x\n", + __func__, dma_hw_desc->opc); + BUG(); + } + case PPC440SPE_XOR_ID: + /* up to 16 sources */ + xor_hw_desc = desc->hw_desc; + return xor_hw_desc->cbc & XOR_CDCR_OAC_MSK; + default: + BUG(); + } + return 0; +} + +/** + * ppc440spe_desc_get_dst_num - get the number of destination addresses in + * this descriptor + */ +static u32 ppc440spe_desc_get_dst_num(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan) +{ + struct dma_cdb *dma_hw_desc; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + /* May be 1 or 2 destinations */ + dma_hw_desc = desc->hw_desc; + switch (dma_hw_desc->opc) { + case DMA_CDB_OPC_NO_OP: + case DMA_CDB_OPC_DCHECK128: + return 0; + case DMA_CDB_OPC_MV_SG1_SG2: + case DMA_CDB_OPC_DFILL128: + return 1; + case DMA_CDB_OPC_MULTICAST: + if (desc->dst_cnt == 2) + return 2; + else + return 1; + default: + printk(KERN_ERR "%s: unknown OPC 0x%02x\n", + __func__, dma_hw_desc->opc); + BUG(); + } + case PPC440SPE_XOR_ID: + /* Always only 1 destination */ + return 1; + default: + BUG(); + } + return 0; +} + +/** + * ppc440spe_desc_get_link - get the address of the descriptor that + * follows this one + */ +static inline u32 ppc440spe_desc_get_link(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan) +{ + if (!desc->hw_next) + return 0; + + return desc->hw_next->phys; +} + +/** + * ppc440spe_desc_is_aligned - check alignment + */ +static inline int ppc440spe_desc_is_aligned( + struct ppc440spe_adma_desc_slot *desc, int num_slots) +{ + return (desc->idx & (num_slots - 1)) ? 0 : 1; +} + +/** + * ppc440spe_chan_xor_slot_count - get the number of slots necessary for + * XOR operation + */ +static int ppc440spe_chan_xor_slot_count(size_t len, int src_cnt, + int *slots_per_op) +{ + int slot_cnt; + + /* each XOR descriptor provides up to 16 source operands */ + slot_cnt = *slots_per_op = (src_cnt + XOR_MAX_OPS - 1)/XOR_MAX_OPS; + + if (likely(len <= PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT)) + return slot_cnt; + + printk(KERN_ERR "%s: len %d > max %d !!\n", + __func__, len, PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT); + BUG(); + return slot_cnt; +} + +/** + * ppc440spe_dma2_pq_slot_count - get the number of slots necessary for + * DMA2 PQ operation + */ +static int ppc440spe_dma2_pq_slot_count(dma_addr_t *srcs, + int src_cnt, size_t len) +{ + signed long long order = 0; + int state = 0; + int addr_count = 0; + int i; + for (i = 1; i < src_cnt; i++) { + dma_addr_t cur_addr = srcs[i]; + dma_addr_t old_addr = srcs[i-1]; + switch (state) { + case 0: + if (cur_addr == old_addr + len) { + /* direct RXOR */ + order = 1; + state = 1; + if (i == src_cnt-1) + addr_count++; + } else if (old_addr == cur_addr + len) { + /* reverse RXOR */ + order = -1; + state = 1; + if (i == src_cnt-1) + addr_count++; + } else { + state = 3; + } + break; + case 1: + if (i == src_cnt-2 || (order == -1 + && cur_addr != old_addr - len)) { + order = 0; + state = 0; + addr_count++; + } else if (cur_addr == old_addr + len*order) { + state = 2; + if (i == src_cnt-1) + addr_count++; + } else if (cur_addr == old_addr + 2*len) { + state = 2; + if (i == src_cnt-1) + addr_count++; + } else if (cur_addr == old_addr + 3*len) { + state = 2; + if (i == src_cnt-1) + addr_count++; + } else { + order = 0; + state = 0; + addr_count++; + } + break; + case 2: + order = 0; + state = 0; + addr_count++; + break; + } + if (state == 3) + break; + } + if (src_cnt <= 1 || (state != 1 && state != 2)) { + pr_err("%s: src_cnt=%d, state=%d, addr_count=%d, order=%lld\n", + __func__, src_cnt, state, addr_count, order); + for (i = 0; i < src_cnt; i++) + pr_err("\t[%d] 0x%llx \n", i, srcs[i]); + BUG(); + } + + return (addr_count + XOR_MAX_OPS - 1) / XOR_MAX_OPS; +} + + +/****************************************************************************** + * ADMA channel low-level routines + ******************************************************************************/ + +static u32 +ppc440spe_chan_get_current_descriptor(struct ppc440spe_adma_chan *chan); +static void ppc440spe_chan_append(struct ppc440spe_adma_chan *chan); + +/** + * ppc440spe_adma_device_clear_eot_status - interrupt ack to XOR or DMA engine + */ +static void ppc440spe_adma_device_clear_eot_status( + struct ppc440spe_adma_chan *chan) +{ + struct dma_regs *dma_reg; + struct xor_regs *xor_reg; + u8 *p = chan->device->dma_desc_pool_virt; + struct dma_cdb *cdb; + u32 rv, i; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + /* read FIFO to ack */ + dma_reg = chan->device->dma_reg; + while ((rv = ioread32(&dma_reg->csfpl))) { + i = rv & DMA_CDB_ADDR_MSK; + cdb = (struct dma_cdb *)&p[i - + (u32)chan->device->dma_desc_pool]; + + /* Clear opcode to ack. This is necessary for + * ZeroSum operations only + */ + cdb->opc = 0; + + if (test_bit(PPC440SPE_RXOR_RUN, + &ppc440spe_rxor_state)) { + /* probably this is a completed RXOR op, + * get pointer to CDB using the fact that + * physical and virtual addresses of CDB + * in pools have the same offsets + */ + if (le32_to_cpu(cdb->sg1u) & + DMA_CUED_XOR_BASE) { + /* this is a RXOR */ + clear_bit(PPC440SPE_RXOR_RUN, + &ppc440spe_rxor_state); + } + } + + if (rv & DMA_CDB_STATUS_MSK) { + /* ZeroSum check failed + */ + struct ppc440spe_adma_desc_slot *iter; + dma_addr_t phys = rv & ~DMA_CDB_MSK; + + /* + * Update the status of corresponding + * descriptor. + */ + list_for_each_entry(iter, &chan->chain, + chain_node) { + if (iter->phys == phys) + break; + } + /* + * if cannot find the corresponding + * slot it's a bug + */ + BUG_ON(&iter->chain_node == &chan->chain); + + if (iter->xor_check_result) { + if (test_bit(PPC440SPE_DESC_PCHECK, + &iter->flags)) { + *iter->xor_check_result |= + SUM_CHECK_P_RESULT; + } else + if (test_bit(PPC440SPE_DESC_QCHECK, + &iter->flags)) { + *iter->xor_check_result |= + SUM_CHECK_Q_RESULT; + } else + BUG(); + } + } + } + + rv = ioread32(&dma_reg->dsts); + if (rv) { + pr_err("DMA%d err status: 0x%x\n", + chan->device->id, rv); + /* write back to clear */ + iowrite32(rv, &dma_reg->dsts); + } + break; + case PPC440SPE_XOR_ID: + /* reset status bits to ack */ + xor_reg = chan->device->xor_reg; + rv = ioread32be(&xor_reg->sr); + iowrite32be(rv, &xor_reg->sr); + + if (rv & (XOR_IE_ICBIE_BIT|XOR_IE_ICIE_BIT|XOR_IE_RPTIE_BIT)) { + if (rv & XOR_IE_RPTIE_BIT) { + /* Read PLB Timeout Error. + * Try to resubmit the CB + */ + u32 val = ioread32be(&xor_reg->ccbalr); + + iowrite32be(val, &xor_reg->cblalr); + + val = ioread32be(&xor_reg->crsr); + iowrite32be(val | XOR_CRSR_XAE_BIT, + &xor_reg->crsr); + } else + pr_err("XOR ERR 0x%x status\n", rv); + break; + } + + /* if the XORcore is idle, but there are unprocessed CBs + * then refetch the s/w chain here + */ + if (!(ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) && + do_xor_refetch) + ppc440spe_chan_append(chan); + break; + } +} + +/** + * ppc440spe_chan_is_busy - get the channel status + */ +static int ppc440spe_chan_is_busy(struct ppc440spe_adma_chan *chan) +{ + struct dma_regs *dma_reg; + struct xor_regs *xor_reg; + int busy = 0; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_reg = chan->device->dma_reg; + /* if command FIFO's head and tail pointers are equal and + * status tail is the same as command, then channel is free + */ + if (ioread16(&dma_reg->cpfhp) != ioread16(&dma_reg->cpftp) || + ioread16(&dma_reg->cpftp) != ioread16(&dma_reg->csftp)) + busy = 1; + break; + case PPC440SPE_XOR_ID: + /* use the special status bit for the XORcore + */ + xor_reg = chan->device->xor_reg; + busy = (ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) ? 1 : 0; + break; + } + + return busy; +} + +/** + * ppc440spe_chan_set_first_xor_descriptor - init XORcore chain + */ +static void ppc440spe_chan_set_first_xor_descriptor( + struct ppc440spe_adma_chan *chan, + struct ppc440spe_adma_desc_slot *next_desc) +{ + struct xor_regs *xor_reg = chan->device->xor_reg; + + if (ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) + printk(KERN_INFO "%s: Warn: XORcore is running " + "when try to set the first CDB!\n", + __func__); + + xor_last_submit = xor_last_linked = next_desc; + + iowrite32be(XOR_CRSR_64BA_BIT, &xor_reg->crsr); + + iowrite32be(next_desc->phys, &xor_reg->cblalr); + iowrite32be(0, &xor_reg->cblahr); + iowrite32be(ioread32be(&xor_reg->cbcr) | XOR_CBCR_LNK_BIT, + &xor_reg->cbcr); + + chan->hw_chain_inited = 1; +} + +/** + * ppc440spe_dma_put_desc - put DMA0,1 descriptor to FIFO. + * called with irqs disabled + */ +static void ppc440spe_dma_put_desc(struct ppc440spe_adma_chan *chan, + struct ppc440spe_adma_desc_slot *desc) +{ + u32 pcdb; + struct dma_regs *dma_reg = chan->device->dma_reg; + + pcdb = desc->phys; + if (!test_bit(PPC440SPE_DESC_INT, &desc->flags)) + pcdb |= DMA_CDB_NO_INT; + + chan_last_sub[chan->device->id] = desc; + + ADMA_LL_DBG(print_cb(chan, desc->hw_desc)); + + iowrite32(pcdb, &dma_reg->cpfpl); +} + +/** + * ppc440spe_chan_append - update the h/w chain in the channel + */ +static void ppc440spe_chan_append(struct ppc440spe_adma_chan *chan) +{ + struct xor_regs *xor_reg; + struct ppc440spe_adma_desc_slot *iter; + struct xor_cb *xcb; + u32 cur_desc; + unsigned long flags; + + local_irq_save(flags); + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + cur_desc = ppc440spe_chan_get_current_descriptor(chan); + + if (likely(cur_desc)) { + iter = chan_last_sub[chan->device->id]; + BUG_ON(!iter); + } else { + /* first peer */ + iter = chan_first_cdb[chan->device->id]; + BUG_ON(!iter); + ppc440spe_dma_put_desc(chan, iter); + chan->hw_chain_inited = 1; + } + + /* is there something new to append */ + if (!iter->hw_next) + break; + + /* flush descriptors from the s/w queue to fifo */ + list_for_each_entry_continue(iter, &chan->chain, chain_node) { + ppc440spe_dma_put_desc(chan, iter); + if (!iter->hw_next) + break; + } + break; + case PPC440SPE_XOR_ID: + /* update h/w links and refetch */ + if (!xor_last_submit->hw_next) + break; + + xor_reg = chan->device->xor_reg; + /* the last linked CDB has to generate an interrupt + * that we'd be able to append the next lists to h/w + * regardless of the XOR engine state at the moment of + * appending of these next lists + */ + xcb = xor_last_linked->hw_desc; + xcb->cbc |= XOR_CBCR_CBCE_BIT; + + if (!(ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT)) { + /* XORcore is idle. Refetch now */ + do_xor_refetch = 0; + ppc440spe_xor_set_link(xor_last_submit, + xor_last_submit->hw_next); + + ADMA_LL_DBG(print_cb_list(chan, + xor_last_submit->hw_next)); + + xor_last_submit = xor_last_linked; + iowrite32be(ioread32be(&xor_reg->crsr) | + XOR_CRSR_RCBE_BIT | XOR_CRSR_64BA_BIT, + &xor_reg->crsr); + } else { + /* XORcore is running. Refetch later in the handler */ + do_xor_refetch = 1; + } + + break; + } + + local_irq_restore(flags); +} + +/** + * ppc440spe_chan_get_current_descriptor - get the currently executed descriptor + */ +static u32 +ppc440spe_chan_get_current_descriptor(struct ppc440spe_adma_chan *chan) +{ + struct dma_regs *dma_reg; + struct xor_regs *xor_reg; + + if (unlikely(!chan->hw_chain_inited)) + /* h/w descriptor chain is not initialized yet */ + return 0; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_reg = chan->device->dma_reg; + return ioread32(&dma_reg->acpl) & (~DMA_CDB_MSK); + case PPC440SPE_XOR_ID: + xor_reg = chan->device->xor_reg; + return ioread32be(&xor_reg->ccbalr); + } + return 0; +} + +/** + * ppc440spe_chan_run - enable the channel + */ +static void ppc440spe_chan_run(struct ppc440spe_adma_chan *chan) +{ + struct xor_regs *xor_reg; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + /* DMAs are always enabled, do nothing */ + break; + case PPC440SPE_XOR_ID: + /* drain write buffer */ + xor_reg = chan->device->xor_reg; + + /* fetch descriptor pointed to in <link> */ + iowrite32be(XOR_CRSR_64BA_BIT | XOR_CRSR_XAE_BIT, + &xor_reg->crsr); + break; + } +} + +/****************************************************************************** + * ADMA device level + ******************************************************************************/ + +static void ppc440spe_chan_start_null_xor(struct ppc440spe_adma_chan *chan); +static int ppc440spe_adma_alloc_chan_resources(struct dma_chan *chan); + +static dma_cookie_t +ppc440spe_adma_tx_submit(struct dma_async_tx_descriptor *tx); + +static void ppc440spe_adma_set_dest(struct ppc440spe_adma_desc_slot *tx, + dma_addr_t addr, int index); +static void +ppc440spe_adma_memcpy_xor_set_src(struct ppc440spe_adma_desc_slot *tx, + dma_addr_t addr, int index); + +static void +ppc440spe_adma_pq_set_dest(struct ppc440spe_adma_desc_slot *tx, + dma_addr_t *paddr, unsigned long flags); +static void +ppc440spe_adma_pq_set_src(struct ppc440spe_adma_desc_slot *tx, + dma_addr_t addr, int index); +static void +ppc440spe_adma_pq_set_src_mult(struct ppc440spe_adma_desc_slot *tx, + unsigned char mult, int index, int dst_pos); +static void +ppc440spe_adma_pqzero_sum_set_dest(struct ppc440spe_adma_desc_slot *tx, + dma_addr_t paddr, dma_addr_t qaddr); + +static struct page *ppc440spe_rxor_srcs[32]; + +/** + * ppc440spe_can_rxor - check if the operands may be processed with RXOR + */ +static int ppc440spe_can_rxor(struct page **srcs, int src_cnt, size_t len) +{ + int i, order = 0, state = 0; + int idx = 0; + + if (unlikely(!(src_cnt > 1))) + return 0; + + BUG_ON(src_cnt > ARRAY_SIZE(ppc440spe_rxor_srcs)); + + /* Skip holes in the source list before checking */ + for (i = 0; i < src_cnt; i++) { + if (!srcs[i]) + continue; + ppc440spe_rxor_srcs[idx++] = srcs[i]; + } + src_cnt = idx; + + for (i = 1; i < src_cnt; i++) { + char *cur_addr = page_address(ppc440spe_rxor_srcs[i]); + char *old_addr = page_address(ppc440spe_rxor_srcs[i - 1]); + + switch (state) { + case 0: + if (cur_addr == old_addr + len) { + /* direct RXOR */ + order = 1; + state = 1; + } else if (old_addr == cur_addr + len) { + /* reverse RXOR */ + order = -1; + state = 1; + } else + goto out; + break; + case 1: + if ((i == src_cnt - 2) || + (order == -1 && cur_addr != old_addr - len)) { + order = 0; + state = 0; + } else if ((cur_addr == old_addr + len * order) || + (cur_addr == old_addr + 2 * len) || + (cur_addr == old_addr + 3 * len)) { + state = 2; + } else { + order = 0; + state = 0; + } + break; + case 2: + order = 0; + state = 0; + break; + } + } + +out: + if (state == 1 || state == 2) + return 1; + + return 0; +} + +/** + * ppc440spe_adma_device_estimate - estimate the efficiency of processing + * the operation given on this channel. It's assumed that 'chan' is + * capable to process 'cap' type of operation. + * @chan: channel to use + * @cap: type of transaction + * @dst_lst: array of destination pointers + * @dst_cnt: number of destination operands + * @src_lst: array of source pointers + * @src_cnt: number of source operands + * @src_sz: size of each source operand + */ +static int ppc440spe_adma_estimate(struct dma_chan *chan, + enum dma_transaction_type cap, struct page **dst_lst, int dst_cnt, + struct page **src_lst, int src_cnt, size_t src_sz) +{ + int ef = 1; + + if (cap == DMA_PQ || cap == DMA_PQ_VAL) { + /* If RAID-6 capabilities were not activated don't try + * to use them + */ + if (unlikely(!ppc440spe_r6_enabled)) + return -1; + } + /* In the current implementation of ppc440spe ADMA driver it + * makes sense to pick out only pq case, because it may be + * processed: + * (1) either using Biskup method on DMA2; + * (2) or on DMA0/1. + * Thus we give a favour to (1) if the sources are suitable; + * else let it be processed on one of the DMA0/1 engines. + * In the sum_product case where destination is also the + * source process it on DMA0/1 only. + */ + if (cap == DMA_PQ && chan->chan_id == PPC440SPE_XOR_ID) { + + if (dst_cnt == 1 && src_cnt == 2 && dst_lst[0] == src_lst[1]) + ef = 0; /* sum_product case, process on DMA0/1 */ + else if (ppc440spe_can_rxor(src_lst, src_cnt, src_sz)) + ef = 3; /* override (DMA0/1 + idle) */ + else + ef = 0; /* can't process on DMA2 if !rxor */ + } + + /* channel idleness increases the priority */ + if (likely(ef) && + !ppc440spe_chan_is_busy(to_ppc440spe_adma_chan(chan))) + ef++; + + return ef; +} + +struct dma_chan * +ppc440spe_async_tx_find_best_channel(enum dma_transaction_type cap, + struct page **dst_lst, int dst_cnt, struct page **src_lst, + int src_cnt, size_t src_sz) +{ + struct dma_chan *best_chan = NULL; + struct ppc_dma_chan_ref *ref; + int best_rank = -1; + + if (unlikely(!src_sz)) + return NULL; + if (src_sz > PAGE_SIZE) { + /* + * should a user of the api ever pass > PAGE_SIZE requests + * we sort out cases where temporary page-sized buffers + * are used. + */ + switch (cap) { + case DMA_PQ: + if (src_cnt == 1 && dst_lst[1] == src_lst[0]) + return NULL; + if (src_cnt == 2 && dst_lst[1] == src_lst[1]) + return NULL; + break; + case DMA_PQ_VAL: + case DMA_XOR_VAL: + return NULL; + default: + break; + } + } + + list_for_each_entry(ref, &ppc440spe_adma_chan_list, node) { + if (dma_has_cap(cap, ref->chan->device->cap_mask)) { + int rank; + + rank = ppc440spe_adma_estimate(ref->chan, cap, dst_lst, + dst_cnt, src_lst, src_cnt, src_sz); + if (rank > best_rank) { + best_rank = rank; + best_chan = ref->chan; + } + } + } + + return best_chan; +} +EXPORT_SYMBOL_GPL(ppc440spe_async_tx_find_best_channel); + +/** + * ppc440spe_get_group_entry - get group entry with index idx + * @tdesc: is the last allocated slot in the group. + */ +static struct ppc440spe_adma_desc_slot * +ppc440spe_get_group_entry(struct ppc440spe_adma_desc_slot *tdesc, u32 entry_idx) +{ + struct ppc440spe_adma_desc_slot *iter = tdesc->group_head; + int i = 0; + + if (entry_idx < 0 || entry_idx >= (tdesc->src_cnt + tdesc->dst_cnt)) { + printk("%s: entry_idx %d, src_cnt %d, dst_cnt %d\n", + __func__, entry_idx, tdesc->src_cnt, tdesc->dst_cnt); + BUG(); + } + + list_for_each_entry(iter, &tdesc->group_list, chain_node) { + if (i++ == entry_idx) + break; + } + return iter; +} + +/** + * ppc440spe_adma_free_slots - flags descriptor slots for reuse + * @slot: Slot to free + * Caller must hold &ppc440spe_chan->lock while calling this function + */ +static void ppc440spe_adma_free_slots(struct ppc440spe_adma_desc_slot *slot, + struct ppc440spe_adma_chan *chan) +{ + int stride = slot->slots_per_op; + + while (stride--) { + slot->slots_per_op = 0; + slot = list_entry(slot->slot_node.next, + struct ppc440spe_adma_desc_slot, + slot_node); + } +} + +static void ppc440spe_adma_unmap(struct ppc440spe_adma_chan *chan, + struct ppc440spe_adma_desc_slot *desc) +{ + u32 src_cnt, dst_cnt; + dma_addr_t addr; + + /* + * get the number of sources & destination + * included in this descriptor and unmap + * them all + */ + src_cnt = ppc440spe_desc_get_src_num(desc, chan); + dst_cnt = ppc440spe_desc_get_dst_num(desc, chan); + + /* unmap destinations */ + if (!(desc->async_tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { + while (dst_cnt--) { + addr = ppc440spe_desc_get_dest_addr( + desc, chan, dst_cnt); + dma_unmap_page(chan->device->dev, + addr, desc->unmap_len, + DMA_FROM_DEVICE); + } + } + + /* unmap sources */ + if (!(desc->async_tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { + while (src_cnt--) { + addr = ppc440spe_desc_get_src_addr( + desc, chan, src_cnt); + dma_unmap_page(chan->device->dev, + addr, desc->unmap_len, + DMA_TO_DEVICE); + } + } +} + +/** + * ppc440spe_adma_run_tx_complete_actions - call functions to be called + * upon completion + */ +static dma_cookie_t ppc440spe_adma_run_tx_complete_actions( + struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, + dma_cookie_t cookie) +{ + int i; + + BUG_ON(desc->async_tx.cookie < 0); + if (desc->async_tx.cookie > 0) { + cookie = desc->async_tx.cookie; + desc->async_tx.cookie = 0; + + /* call the callback (must not sleep or submit new + * operations to this channel) + */ + if (desc->async_tx.callback) + desc->async_tx.callback( + desc->async_tx.callback_param); + + /* unmap dma addresses + * (unmap_single vs unmap_page?) + * + * actually, ppc's dma_unmap_page() functions are empty, so + * the following code is just for the sake of completeness + */ + if (chan && chan->needs_unmap && desc->group_head && + desc->unmap_len) { + struct ppc440spe_adma_desc_slot *unmap = + desc->group_head; + /* assume 1 slot per op always */ + u32 slot_count = unmap->slot_cnt; + + /* Run through the group list and unmap addresses */ + for (i = 0; i < slot_count; i++) { + BUG_ON(!unmap); + ppc440spe_adma_unmap(chan, unmap); + unmap = unmap->hw_next; + } + } + } + + /* run dependent operations */ + dma_run_dependencies(&desc->async_tx); + + return cookie; +} + +/** + * ppc440spe_adma_clean_slot - clean up CDB slot (if ack is set) + */ +static int ppc440spe_adma_clean_slot(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan) +{ + /* the client is allowed to attach dependent operations + * until 'ack' is set + */ + if (!async_tx_test_ack(&desc->async_tx)) + return 0; + + /* leave the last descriptor in the chain + * so we can append to it + */ + if (list_is_last(&desc->chain_node, &chan->chain) || + desc->phys == ppc440spe_chan_get_current_descriptor(chan)) + return 1; + + if (chan->device->id != PPC440SPE_XOR_ID) { + /* our DMA interrupt handler clears opc field of + * each processed descriptor. For all types of + * operations except for ZeroSum we do not actually + * need ack from the interrupt handler. ZeroSum is a + * special case since the result of this operation + * is available from the handler only, so if we see + * such type of descriptor (which is unprocessed yet) + * then leave it in chain. + */ + struct dma_cdb *cdb = desc->hw_desc; + if (cdb->opc == DMA_CDB_OPC_DCHECK128) + return 1; + } + + dev_dbg(chan->device->common.dev, "\tfree slot %llx: %d stride: %d\n", + desc->phys, desc->idx, desc->slots_per_op); + + list_del(&desc->chain_node); + ppc440spe_adma_free_slots(desc, chan); + return 0; +} + +/** + * __ppc440spe_adma_slot_cleanup - this is the common clean-up routine + * which runs through the channel CDBs list until reach the descriptor + * currently processed. When routine determines that all CDBs of group + * are completed then corresponding callbacks (if any) are called and slots + * are freed. + */ +static void __ppc440spe_adma_slot_cleanup(struct ppc440spe_adma_chan *chan) +{ + struct ppc440spe_adma_desc_slot *iter, *_iter, *group_start = NULL; + dma_cookie_t cookie = 0; + u32 current_desc = ppc440spe_chan_get_current_descriptor(chan); + int busy = ppc440spe_chan_is_busy(chan); + int seen_current = 0, slot_cnt = 0, slots_per_op = 0; + + dev_dbg(chan->device->common.dev, "ppc440spe adma%d: %s\n", + chan->device->id, __func__); + + if (!current_desc) { + /* There were no transactions yet, so + * nothing to clean + */ + return; + } + + /* free completed slots from the chain starting with + * the oldest descriptor + */ + list_for_each_entry_safe(iter, _iter, &chan->chain, + chain_node) { + dev_dbg(chan->device->common.dev, "\tcookie: %d slot: %d " + "busy: %d this_desc: %#llx next_desc: %#x " + "cur: %#x ack: %d\n", + iter->async_tx.cookie, iter->idx, busy, iter->phys, + ppc440spe_desc_get_link(iter, chan), current_desc, + async_tx_test_ack(&iter->async_tx)); + prefetch(_iter); + prefetch(&_iter->async_tx); + + /* do not advance past the current descriptor loaded into the + * hardware channel,subsequent descriptors are either in process + * or have not been submitted + */ + if (seen_current) + break; + + /* stop the search if we reach the current descriptor and the + * channel is busy, or if it appears that the current descriptor + * needs to be re-read (i.e. has been appended to) + */ + if (iter->phys == current_desc) { + BUG_ON(seen_current++); + if (busy || ppc440spe_desc_get_link(iter, chan)) { + /* not all descriptors of the group have + * been completed; exit. + */ + break; + } + } + + /* detect the start of a group transaction */ + if (!slot_cnt && !slots_per_op) { + slot_cnt = iter->slot_cnt; + slots_per_op = iter->slots_per_op; + if (slot_cnt <= slots_per_op) { + slot_cnt = 0; + slots_per_op = 0; + } + } + + if (slot_cnt) { + if (!group_start) + group_start = iter; + slot_cnt -= slots_per_op; + } + + /* all the members of a group are complete */ + if (slots_per_op != 0 && slot_cnt == 0) { + struct ppc440spe_adma_desc_slot *grp_iter, *_grp_iter; + int end_of_chain = 0; + + /* clean up the group */ + slot_cnt = group_start->slot_cnt; + grp_iter = group_start; + list_for_each_entry_safe_from(grp_iter, _grp_iter, + &chan->chain, chain_node) { + + cookie = ppc440spe_adma_run_tx_complete_actions( + grp_iter, chan, cookie); + + slot_cnt -= slots_per_op; + end_of_chain = ppc440spe_adma_clean_slot( + grp_iter, chan); + if (end_of_chain && slot_cnt) { + /* Should wait for ZeroSum completion */ + if (cookie > 0) + chan->completed_cookie = cookie; + return; + } + + if (slot_cnt == 0 || end_of_chain) + break; + } + + /* the group should be complete at this point */ + BUG_ON(slot_cnt); + + slots_per_op = 0; + group_start = NULL; + if (end_of_chain) + break; + else + continue; + } else if (slots_per_op) /* wait for group completion */ + continue; + + cookie = ppc440spe_adma_run_tx_complete_actions(iter, chan, + cookie); + + if (ppc440spe_adma_clean_slot(iter, chan)) + break; + } + + BUG_ON(!seen_current); + + if (cookie > 0) { + chan->completed_cookie = cookie; + pr_debug("\tcompleted cookie %d\n", cookie); + } + +} + +/** + * ppc440spe_adma_tasklet - clean up watch-dog initiator + */ +static void ppc440spe_adma_tasklet(unsigned long data) +{ + struct ppc440spe_adma_chan *chan = (struct ppc440spe_adma_chan *) data; + + spin_lock_nested(&chan->lock, SINGLE_DEPTH_NESTING); + __ppc440spe_adma_slot_cleanup(chan); + spin_unlock(&chan->lock); +} + +/** + * ppc440spe_adma_slot_cleanup - clean up scheduled initiator + */ +static void ppc440spe_adma_slot_cleanup(struct ppc440spe_adma_chan *chan) +{ + spin_lock_bh(&chan->lock); + __ppc440spe_adma_slot_cleanup(chan); + spin_unlock_bh(&chan->lock); +} + +/** + * ppc440spe_adma_alloc_slots - allocate free slots (if any) + */ +static struct ppc440spe_adma_desc_slot *ppc440spe_adma_alloc_slots( + struct ppc440spe_adma_chan *chan, int num_slots, + int slots_per_op) +{ + struct ppc440spe_adma_desc_slot *iter = NULL, *_iter; + struct ppc440spe_adma_desc_slot *alloc_start = NULL; + struct list_head chain = LIST_HEAD_INIT(chain); + int slots_found, retry = 0; + + + BUG_ON(!num_slots || !slots_per_op); + /* start search from the last allocated descrtiptor + * if a contiguous allocation can not be found start searching + * from the beginning of the list + */ +retry: + slots_found = 0; + if (retry == 0) + iter = chan->last_used; + else + iter = list_entry(&chan->all_slots, + struct ppc440spe_adma_desc_slot, + slot_node); + list_for_each_entry_safe_continue(iter, _iter, &chan->all_slots, + slot_node) { + prefetch(_iter); + prefetch(&_iter->async_tx); + if (iter->slots_per_op) { + slots_found = 0; + continue; + } + + /* start the allocation if the slot is correctly aligned */ + if (!slots_found++) + alloc_start = iter; + + if (slots_found == num_slots) { + struct ppc440spe_adma_desc_slot *alloc_tail = NULL; + struct ppc440spe_adma_desc_slot *last_used = NULL; + + iter = alloc_start; + while (num_slots) { + int i; + /* pre-ack all but the last descriptor */ + if (num_slots != slots_per_op) + async_tx_ack(&iter->async_tx); + + list_add_tail(&iter->chain_node, &chain); + alloc_tail = iter; + iter->async_tx.cookie = 0; + iter->hw_next = NULL; + iter->flags = 0; + iter->slot_cnt = num_slots; + iter->xor_check_result = NULL; + for (i = 0; i < slots_per_op; i++) { + iter->slots_per_op = slots_per_op - i; + last_used = iter; + iter = list_entry(iter->slot_node.next, + struct ppc440spe_adma_desc_slot, + slot_node); + } + num_slots -= slots_per_op; + } + alloc_tail->group_head = alloc_start; + alloc_tail->async_tx.cookie = -EBUSY; + list_splice(&chain, &alloc_tail->group_list); + chan->last_used = last_used; + return alloc_tail; + } + } + if (!retry++) + goto retry; + + /* try to free some slots if the allocation fails */ + tasklet_schedule(&chan->irq_tasklet); + return NULL; +} + +/** + * ppc440spe_adma_alloc_chan_resources - allocate pools for CDB slots + */ +static int ppc440spe_adma_alloc_chan_resources(struct dma_chan *chan) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *slot = NULL; + char *hw_desc; + int i, db_sz; + int init; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + init = ppc440spe_chan->slots_allocated ? 0 : 1; + chan->chan_id = ppc440spe_chan->device->id; + + /* Allocate descriptor slots */ + i = ppc440spe_chan->slots_allocated; + if (ppc440spe_chan->device->id != PPC440SPE_XOR_ID) + db_sz = sizeof(struct dma_cdb); + else + db_sz = sizeof(struct xor_cb); + + for (; i < (ppc440spe_chan->device->pool_size / db_sz); i++) { + slot = kzalloc(sizeof(struct ppc440spe_adma_desc_slot), + GFP_KERNEL); + if (!slot) { + printk(KERN_INFO "SPE ADMA Channel only initialized" + " %d descriptor slots", i--); + break; + } + + hw_desc = (char *) ppc440spe_chan->device->dma_desc_pool_virt; + slot->hw_desc = (void *) &hw_desc[i * db_sz]; + dma_async_tx_descriptor_init(&slot->async_tx, chan); + slot->async_tx.tx_submit = ppc440spe_adma_tx_submit; + INIT_LIST_HEAD(&slot->chain_node); + INIT_LIST_HEAD(&slot->slot_node); + INIT_LIST_HEAD(&slot->group_list); + slot->phys = ppc440spe_chan->device->dma_desc_pool + i * db_sz; + slot->idx = i; + + spin_lock_bh(&ppc440spe_chan->lock); + ppc440spe_chan->slots_allocated++; + list_add_tail(&slot->slot_node, &ppc440spe_chan->all_slots); + spin_unlock_bh(&ppc440spe_chan->lock); + } + + if (i && !ppc440spe_chan->last_used) { + ppc440spe_chan->last_used = + list_entry(ppc440spe_chan->all_slots.next, + struct ppc440spe_adma_desc_slot, + slot_node); + } + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: allocated %d descriptor slots\n", + ppc440spe_chan->device->id, i); + + /* initialize the channel and the chain with a null operation */ + if (init) { + switch (ppc440spe_chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + ppc440spe_chan->hw_chain_inited = 0; + /* Use WXOR for self-testing */ + if (!ppc440spe_r6_tchan) + ppc440spe_r6_tchan = ppc440spe_chan; + break; + case PPC440SPE_XOR_ID: + ppc440spe_chan_start_null_xor(ppc440spe_chan); + break; + default: + BUG(); + } + ppc440spe_chan->needs_unmap = 1; + } + + return (i > 0) ? i : -ENOMEM; +} + +/** + * ppc440spe_desc_assign_cookie - assign a cookie + */ +static dma_cookie_t ppc440spe_desc_assign_cookie( + struct ppc440spe_adma_chan *chan, + struct ppc440spe_adma_desc_slot *desc) +{ + dma_cookie_t cookie = chan->common.cookie; + + cookie++; + if (cookie < 0) + cookie = 1; + chan->common.cookie = desc->async_tx.cookie = cookie; + return cookie; +} + +/** + * ppc440spe_rxor_set_region_data - + */ +static void ppc440spe_rxor_set_region(struct ppc440spe_adma_desc_slot *desc, + u8 xor_arg_no, u32 mask) +{ + struct xor_cb *xcb = desc->hw_desc; + + xcb->ops[xor_arg_no].h |= mask; +} + +/** + * ppc440spe_rxor_set_src - + */ +static void ppc440spe_rxor_set_src(struct ppc440spe_adma_desc_slot *desc, + u8 xor_arg_no, dma_addr_t addr) +{ + struct xor_cb *xcb = desc->hw_desc; + + xcb->ops[xor_arg_no].h |= DMA_CUED_XOR_BASE; + xcb->ops[xor_arg_no].l = addr; +} + +/** + * ppc440spe_rxor_set_mult - + */ +static void ppc440spe_rxor_set_mult(struct ppc440spe_adma_desc_slot *desc, + u8 xor_arg_no, u8 idx, u8 mult) +{ + struct xor_cb *xcb = desc->hw_desc; + + xcb->ops[xor_arg_no].h |= mult << (DMA_CUED_MULT1_OFF + idx * 8); +} + +/** + * ppc440spe_adma_check_threshold - append CDBs to h/w chain if threshold + * has been achieved + */ +static void ppc440spe_adma_check_threshold(struct ppc440spe_adma_chan *chan) +{ + dev_dbg(chan->device->common.dev, "ppc440spe adma%d: pending: %d\n", + chan->device->id, chan->pending); + + if (chan->pending >= PPC440SPE_ADMA_THRESHOLD) { + chan->pending = 0; + ppc440spe_chan_append(chan); + } +} + +/** + * ppc440spe_adma_tx_submit - submit new descriptor group to the channel + * (it's not necessary that descriptors will be submitted to the h/w + * chains too right now) + */ +static dma_cookie_t ppc440spe_adma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct ppc440spe_adma_desc_slot *sw_desc; + struct ppc440spe_adma_chan *chan = to_ppc440spe_adma_chan(tx->chan); + struct ppc440spe_adma_desc_slot *group_start, *old_chain_tail; + int slot_cnt; + int slots_per_op; + dma_cookie_t cookie; + + sw_desc = tx_to_ppc440spe_adma_slot(tx); + + group_start = sw_desc->group_head; + slot_cnt = group_start->slot_cnt; + slots_per_op = group_start->slots_per_op; + + spin_lock_bh(&chan->lock); + + cookie = ppc440spe_desc_assign_cookie(chan, sw_desc); + + if (unlikely(list_empty(&chan->chain))) { + /* first peer */ + list_splice_init(&sw_desc->group_list, &chan->chain); + chan_first_cdb[chan->device->id] = group_start; + } else { + /* isn't first peer, bind CDBs to chain */ + old_chain_tail = list_entry(chan->chain.prev, + struct ppc440spe_adma_desc_slot, + chain_node); + list_splice_init(&sw_desc->group_list, + &old_chain_tail->chain_node); + /* fix up the hardware chain */ + ppc440spe_desc_set_link(chan, old_chain_tail, group_start); + } + + /* increment the pending count by the number of operations */ + chan->pending += slot_cnt / slots_per_op; + ppc440spe_adma_check_threshold(chan); + spin_unlock_bh(&chan->lock); + + dev_dbg(chan->device->common.dev, + "ppc440spe adma%d: %s cookie: %d slot: %d tx %p\n", + chan->device->id, __func__, + sw_desc->async_tx.cookie, sw_desc->idx, sw_desc); + + return cookie; +} + +/** + * ppc440spe_adma_prep_dma_interrupt - prepare CDB for a pseudo DMA operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_interrupt( + struct dma_chan *chan, unsigned long flags) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *sw_desc, *group_start; + int slot_cnt, slots_per_op; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: %s\n", ppc440spe_chan->device->id, + __func__); + + spin_lock_bh(&ppc440spe_chan->lock); + slot_cnt = slots_per_op = 1; + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, + slots_per_op); + if (sw_desc) { + group_start = sw_desc->group_head; + ppc440spe_desc_init_interrupt(group_start, ppc440spe_chan); + group_start->unmap_len = 0; + sw_desc->async_tx.flags = flags; + } + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +/** + * ppc440spe_adma_prep_dma_memcpy - prepare CDB for a MEMCPY operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_memcpy( + struct dma_chan *chan, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *sw_desc, *group_start; + int slot_cnt, slots_per_op; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + + if (unlikely(!len)) + return NULL; + + BUG_ON(unlikely(len > PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT)); + + spin_lock_bh(&ppc440spe_chan->lock); + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: %s len: %u int_en %d\n", + ppc440spe_chan->device->id, __func__, len, + flags & DMA_PREP_INTERRUPT ? 1 : 0); + slot_cnt = slots_per_op = 1; + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, + slots_per_op); + if (sw_desc) { + group_start = sw_desc->group_head; + ppc440spe_desc_init_memcpy(group_start, flags); + ppc440spe_adma_set_dest(group_start, dma_dest, 0); + ppc440spe_adma_memcpy_xor_set_src(group_start, dma_src, 0); + ppc440spe_desc_set_byte_count(group_start, ppc440spe_chan, len); + sw_desc->unmap_len = len; + sw_desc->async_tx.flags = flags; + } + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +/** + * ppc440spe_adma_prep_dma_memset - prepare CDB for a MEMSET operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_memset( + struct dma_chan *chan, dma_addr_t dma_dest, int value, + size_t len, unsigned long flags) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *sw_desc, *group_start; + int slot_cnt, slots_per_op; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + + if (unlikely(!len)) + return NULL; + + BUG_ON(unlikely(len > PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT)); + + spin_lock_bh(&ppc440spe_chan->lock); + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: %s cal: %u len: %u int_en %d\n", + ppc440spe_chan->device->id, __func__, value, len, + flags & DMA_PREP_INTERRUPT ? 1 : 0); + + slot_cnt = slots_per_op = 1; + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, + slots_per_op); + if (sw_desc) { + group_start = sw_desc->group_head; + ppc440spe_desc_init_memset(group_start, value, flags); + ppc440spe_adma_set_dest(group_start, dma_dest, 0); + ppc440spe_desc_set_byte_count(group_start, ppc440spe_chan, len); + sw_desc->unmap_len = len; + sw_desc->async_tx.flags = flags; + } + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +/** + * ppc440spe_adma_prep_dma_xor - prepare CDB for a XOR operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_xor( + struct dma_chan *chan, dma_addr_t dma_dest, + dma_addr_t *dma_src, u32 src_cnt, size_t len, + unsigned long flags) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *sw_desc, *group_start; + int slot_cnt, slots_per_op; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + + ADMA_LL_DBG(prep_dma_xor_dbg(ppc440spe_chan->device->id, + dma_dest, dma_src, src_cnt)); + if (unlikely(!len)) + return NULL; + BUG_ON(unlikely(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT)); + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: %s src_cnt: %d len: %u int_en: %d\n", + ppc440spe_chan->device->id, __func__, src_cnt, len, + flags & DMA_PREP_INTERRUPT ? 1 : 0); + + spin_lock_bh(&ppc440spe_chan->lock); + slot_cnt = ppc440spe_chan_xor_slot_count(len, src_cnt, &slots_per_op); + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, + slots_per_op); + if (sw_desc) { + group_start = sw_desc->group_head; + ppc440spe_desc_init_xor(group_start, src_cnt, flags); + ppc440spe_adma_set_dest(group_start, dma_dest, 0); + while (src_cnt--) + ppc440spe_adma_memcpy_xor_set_src(group_start, + dma_src[src_cnt], src_cnt); + ppc440spe_desc_set_byte_count(group_start, ppc440spe_chan, len); + sw_desc->unmap_len = len; + sw_desc->async_tx.flags = flags; + } + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +static inline void +ppc440spe_desc_set_xor_src_cnt(struct ppc440spe_adma_desc_slot *desc, + int src_cnt); +static void ppc440spe_init_rxor_cursor(struct ppc440spe_rxor *cursor); + +/** + * ppc440spe_adma_init_dma2rxor_slot - + */ +static void ppc440spe_adma_init_dma2rxor_slot( + struct ppc440spe_adma_desc_slot *desc, + dma_addr_t *src, int src_cnt) +{ + int i; + + /* initialize CDB */ + for (i = 0; i < src_cnt; i++) { + ppc440spe_adma_dma2rxor_prep_src(desc, &desc->rxor_cursor, i, + desc->src_cnt, (u32)src[i]); + } +} + +/** + * ppc440spe_dma01_prep_mult - + * for Q operation where destination is also the source + */ +static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_mult( + struct ppc440spe_adma_chan *ppc440spe_chan, + dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt, + const unsigned char *scf, size_t len, unsigned long flags) +{ + struct ppc440spe_adma_desc_slot *sw_desc = NULL; + unsigned long op = 0; + int slot_cnt; + + set_bit(PPC440SPE_DESC_WXOR, &op); + slot_cnt = 2; + + spin_lock_bh(&ppc440spe_chan->lock); + + /* use WXOR, each descriptor occupies one slot */ + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); + if (sw_desc) { + struct ppc440spe_adma_chan *chan; + struct ppc440spe_adma_desc_slot *iter; + struct dma_cdb *hw_desc; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + set_bits(op, &sw_desc->flags); + sw_desc->src_cnt = src_cnt; + sw_desc->dst_cnt = dst_cnt; + /* First descriptor, zero data in the destination and copy it + * to q page using MULTICAST transfer. + */ + iter = list_first_entry(&sw_desc->group_list, + struct ppc440spe_adma_desc_slot, + chain_node); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + /* set 'next' pointer */ + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MULTICAST; + + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, dst[0], 0); + ppc440spe_desc_set_dest_addr(iter, chan, 0, dst[1], 1); + ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, + src[0]); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); + iter->unmap_len = len; + + /* + * Second descriptor, multiply data from the q page + * and store the result in real destination. + */ + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->hw_next = NULL; + if (flags & DMA_PREP_INTERRUPT) + set_bit(PPC440SPE_DESC_INT, &iter->flags); + else + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + ppc440spe_desc_set_src_addr(iter, chan, 0, + DMA_CUED_XOR_HB, dst[1]); + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, dst[0], 0); + + ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, + DMA_CDB_SG_DST1, scf[0]); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); + iter->unmap_len = len; + sw_desc->async_tx.flags = flags; + } + + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc; +} + +/** + * ppc440spe_dma01_prep_sum_product - + * Dx = A*(P+Pxy) + B*(Q+Qxy) operation where destination is also + * the source. + */ +static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_sum_product( + struct ppc440spe_adma_chan *ppc440spe_chan, + dma_addr_t *dst, dma_addr_t *src, int src_cnt, + const unsigned char *scf, size_t len, unsigned long flags) +{ + struct ppc440spe_adma_desc_slot *sw_desc = NULL; + unsigned long op = 0; + int slot_cnt; + + set_bit(PPC440SPE_DESC_WXOR, &op); + slot_cnt = 3; + + spin_lock_bh(&ppc440spe_chan->lock); + + /* WXOR, each descriptor occupies one slot */ + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); + if (sw_desc) { + struct ppc440spe_adma_chan *chan; + struct ppc440spe_adma_desc_slot *iter; + struct dma_cdb *hw_desc; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + set_bits(op, &sw_desc->flags); + sw_desc->src_cnt = src_cnt; + sw_desc->dst_cnt = 1; + /* 1st descriptor, src[1] data to q page and zero destination */ + iter = list_first_entry(&sw_desc->group_list, + struct ppc440spe_adma_desc_slot, + chain_node); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MULTICAST; + + ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, + *dst, 0); + ppc440spe_desc_set_dest_addr(iter, chan, 0, + ppc440spe_chan->qdest, 1); + ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, + src[1]); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); + iter->unmap_len = len; + + /* 2nd descriptor, multiply src[1] data and store the + * result in destination */ + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + /* set 'next' pointer */ + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + if (flags & DMA_PREP_INTERRUPT) + set_bit(PPC440SPE_DESC_INT, &iter->flags); + else + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, + ppc440spe_chan->qdest); + ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, + *dst, 0); + ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, + DMA_CDB_SG_DST1, scf[1]); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); + iter->unmap_len = len; + + /* + * 3rd descriptor, multiply src[0] data and xor it + * with destination + */ + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->hw_next = NULL; + if (flags & DMA_PREP_INTERRUPT) + set_bit(PPC440SPE_DESC_INT, &iter->flags); + else + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, + src[0]); + ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, + *dst, 0); + ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, + DMA_CDB_SG_DST1, scf[0]); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); + iter->unmap_len = len; + sw_desc->async_tx.flags = flags; + } + + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc; +} + +static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_pq( + struct ppc440spe_adma_chan *ppc440spe_chan, + dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt, + const unsigned char *scf, size_t len, unsigned long flags) +{ + int slot_cnt; + struct ppc440spe_adma_desc_slot *sw_desc = NULL, *iter; + unsigned long op = 0; + unsigned char mult = 1; + + pr_debug("%s: dst_cnt %d, src_cnt %d, len %d\n", + __func__, dst_cnt, src_cnt, len); + /* select operations WXOR/RXOR depending on the + * source addresses of operators and the number + * of destinations (RXOR support only Q-parity calculations) + */ + set_bit(PPC440SPE_DESC_WXOR, &op); + if (!test_and_set_bit(PPC440SPE_RXOR_RUN, &ppc440spe_rxor_state)) { + /* no active RXOR; + * do RXOR if: + * - there are more than 1 source, + * - len is aligned on 512-byte boundary, + * - source addresses fit to one of 4 possible regions. + */ + if (src_cnt > 1 && + !(len & MQ0_CF2H_RXOR_BS_MASK) && + (src[0] + len) == src[1]) { + /* may do RXOR R1 R2 */ + set_bit(PPC440SPE_DESC_RXOR, &op); + if (src_cnt != 2) { + /* may try to enhance region of RXOR */ + if ((src[1] + len) == src[2]) { + /* do RXOR R1 R2 R3 */ + set_bit(PPC440SPE_DESC_RXOR123, + &op); + } else if ((src[1] + len * 2) == src[2]) { + /* do RXOR R1 R2 R4 */ + set_bit(PPC440SPE_DESC_RXOR124, &op); + } else if ((src[1] + len * 3) == src[2]) { + /* do RXOR R1 R2 R5 */ + set_bit(PPC440SPE_DESC_RXOR125, + &op); + } else { + /* do RXOR R1 R2 */ + set_bit(PPC440SPE_DESC_RXOR12, + &op); + } + } else { + /* do RXOR R1 R2 */ + set_bit(PPC440SPE_DESC_RXOR12, &op); + } + } + + if (!test_bit(PPC440SPE_DESC_RXOR, &op)) { + /* can not do this operation with RXOR */ + clear_bit(PPC440SPE_RXOR_RUN, + &ppc440spe_rxor_state); + } else { + /* can do; set block size right now */ + ppc440spe_desc_set_rxor_block_size(len); + } + } + + /* Number of necessary slots depends on operation type selected */ + if (!test_bit(PPC440SPE_DESC_RXOR, &op)) { + /* This is a WXOR only chain. Need descriptors for each + * source to GF-XOR them with WXOR, and need descriptors + * for each destination to zero them with WXOR + */ + slot_cnt = src_cnt; + + if (flags & DMA_PREP_ZERO_P) { + slot_cnt++; + set_bit(PPC440SPE_ZERO_P, &op); + } + if (flags & DMA_PREP_ZERO_Q) { + slot_cnt++; + set_bit(PPC440SPE_ZERO_Q, &op); + } + } else { + /* Need 1/2 descriptor for RXOR operation, and + * need (src_cnt - (2 or 3)) for WXOR of sources + * remained (if any) + */ + slot_cnt = dst_cnt; + + if (flags & DMA_PREP_ZERO_P) + set_bit(PPC440SPE_ZERO_P, &op); + if (flags & DMA_PREP_ZERO_Q) + set_bit(PPC440SPE_ZERO_Q, &op); + + if (test_bit(PPC440SPE_DESC_RXOR12, &op)) + slot_cnt += src_cnt - 2; + else + slot_cnt += src_cnt - 3; + + /* Thus we have either RXOR only chain or + * mixed RXOR/WXOR + */ + if (slot_cnt == dst_cnt) + /* RXOR only chain */ + clear_bit(PPC440SPE_DESC_WXOR, &op); + } + + spin_lock_bh(&ppc440spe_chan->lock); + /* for both RXOR/WXOR each descriptor occupies one slot */ + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); + if (sw_desc) { + ppc440spe_desc_init_dma01pq(sw_desc, dst_cnt, src_cnt, + flags, op); + + /* setup dst/src/mult */ + pr_debug("%s: set dst descriptor 0, 1: 0x%016llx, 0x%016llx\n", + __func__, dst[0], dst[1]); + ppc440spe_adma_pq_set_dest(sw_desc, dst, flags); + while (src_cnt--) { + ppc440spe_adma_pq_set_src(sw_desc, src[src_cnt], + src_cnt); + + /* NOTE: "Multi = 0 is equivalent to = 1" as it + * stated in 440SPSPe_RAID6_Addendum_UM_1_17.pdf + * doesn't work for RXOR with DMA0/1! Instead, multi=0 + * leads to zeroing source data after RXOR. + * So, for P case set-up mult=1 explicitly. + */ + if (!(flags & DMA_PREP_PQ_DISABLE_Q)) + mult = scf[src_cnt]; + ppc440spe_adma_pq_set_src_mult(sw_desc, + mult, src_cnt, dst_cnt - 1); + } + + /* Setup byte count foreach slot just allocated */ + sw_desc->async_tx.flags = flags; + list_for_each_entry(iter, &sw_desc->group_list, + chain_node) { + ppc440spe_desc_set_byte_count(iter, + ppc440spe_chan, len); + iter->unmap_len = len; + } + } + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc; +} + +static struct ppc440spe_adma_desc_slot *ppc440spe_dma2_prep_pq( + struct ppc440spe_adma_chan *ppc440spe_chan, + dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt, + const unsigned char *scf, size_t len, unsigned long flags) +{ + int slot_cnt, descs_per_op; + struct ppc440spe_adma_desc_slot *sw_desc = NULL, *iter; + unsigned long op = 0; + unsigned char mult = 1; + + BUG_ON(!dst_cnt); + /*pr_debug("%s: dst_cnt %d, src_cnt %d, len %d\n", + __func__, dst_cnt, src_cnt, len);*/ + + spin_lock_bh(&ppc440spe_chan->lock); + descs_per_op = ppc440spe_dma2_pq_slot_count(src, src_cnt, len); + if (descs_per_op < 0) { + spin_unlock_bh(&ppc440spe_chan->lock); + return NULL; + } + + /* depending on number of sources we have 1 or 2 RXOR chains */ + slot_cnt = descs_per_op * dst_cnt; + + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); + if (sw_desc) { + op = slot_cnt; + sw_desc->async_tx.flags = flags; + list_for_each_entry(iter, &sw_desc->group_list, chain_node) { + ppc440spe_desc_init_dma2pq(iter, dst_cnt, src_cnt, + --op ? 0 : flags); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, + len); + iter->unmap_len = len; + + ppc440spe_init_rxor_cursor(&(iter->rxor_cursor)); + iter->rxor_cursor.len = len; + iter->descs_per_op = descs_per_op; + } + op = 0; + list_for_each_entry(iter, &sw_desc->group_list, chain_node) { + op++; + if (op % descs_per_op == 0) + ppc440spe_adma_init_dma2rxor_slot(iter, src, + src_cnt); + if (likely(!list_is_last(&iter->chain_node, + &sw_desc->group_list))) { + /* set 'next' pointer */ + iter->hw_next = + list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + ppc440spe_xor_set_link(iter, iter->hw_next); + } else { + /* this is the last descriptor. */ + iter->hw_next = NULL; + } + } + + /* fixup head descriptor */ + sw_desc->dst_cnt = dst_cnt; + if (flags & DMA_PREP_ZERO_P) + set_bit(PPC440SPE_ZERO_P, &sw_desc->flags); + if (flags & DMA_PREP_ZERO_Q) + set_bit(PPC440SPE_ZERO_Q, &sw_desc->flags); + + /* setup dst/src/mult */ + ppc440spe_adma_pq_set_dest(sw_desc, dst, flags); + + while (src_cnt--) { + /* handle descriptors (if dst_cnt == 2) inside + * the ppc440spe_adma_pq_set_srcxxx() functions + */ + ppc440spe_adma_pq_set_src(sw_desc, src[src_cnt], + src_cnt); + if (!(flags & DMA_PREP_PQ_DISABLE_Q)) + mult = scf[src_cnt]; + ppc440spe_adma_pq_set_src_mult(sw_desc, + mult, src_cnt, dst_cnt - 1); + } + } + spin_unlock_bh(&ppc440spe_chan->lock); + ppc440spe_desc_set_rxor_block_size(len); + return sw_desc; +} + +/** + * ppc440spe_adma_prep_dma_pq - prepare CDB (group) for a GF-XOR operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_pq( + struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, + size_t len, unsigned long flags) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *sw_desc = NULL; + int dst_cnt = 0; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + + ADMA_LL_DBG(prep_dma_pq_dbg(ppc440spe_chan->device->id, + dst, src, src_cnt)); + BUG_ON(!len); + BUG_ON(unlikely(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT)); + BUG_ON(!src_cnt); + + if (src_cnt == 1 && dst[1] == src[0]) { + dma_addr_t dest[2]; + + /* dst[1] is real destination (Q) */ + dest[0] = dst[1]; + /* this is the page to multicast source data to */ + dest[1] = ppc440spe_chan->qdest; + sw_desc = ppc440spe_dma01_prep_mult(ppc440spe_chan, + dest, 2, src, src_cnt, scf, len, flags); + return sw_desc ? &sw_desc->async_tx : NULL; + } + + if (src_cnt == 2 && dst[1] == src[1]) { + sw_desc = ppc440spe_dma01_prep_sum_product(ppc440spe_chan, + &dst[1], src, 2, scf, len, flags); + return sw_desc ? &sw_desc->async_tx : NULL; + } + + if (!(flags & DMA_PREP_PQ_DISABLE_P)) { + BUG_ON(!dst[0]); + dst_cnt++; + flags |= DMA_PREP_ZERO_P; + } + + if (!(flags & DMA_PREP_PQ_DISABLE_Q)) { + BUG_ON(!dst[1]); + dst_cnt++; + flags |= DMA_PREP_ZERO_Q; + } + + BUG_ON(!dst_cnt); + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: %s src_cnt: %d len: %u int_en: %d\n", + ppc440spe_chan->device->id, __func__, src_cnt, len, + flags & DMA_PREP_INTERRUPT ? 1 : 0); + + switch (ppc440spe_chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + sw_desc = ppc440spe_dma01_prep_pq(ppc440spe_chan, + dst, dst_cnt, src, src_cnt, scf, + len, flags); + break; + + case PPC440SPE_XOR_ID: + sw_desc = ppc440spe_dma2_prep_pq(ppc440spe_chan, + dst, dst_cnt, src, src_cnt, scf, + len, flags); + break; + } + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +/** + * ppc440spe_adma_prep_dma_pqzero_sum - prepare CDB group for + * a PQ_ZERO_SUM operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_pqzero_sum( + struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + enum sum_check_flags *pqres, unsigned long flags) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *sw_desc, *iter; + dma_addr_t pdest, qdest; + int slot_cnt, slots_per_op, idst, dst_cnt; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + + if (flags & DMA_PREP_PQ_DISABLE_P) + pdest = 0; + else + pdest = pq[0]; + + if (flags & DMA_PREP_PQ_DISABLE_Q) + qdest = 0; + else + qdest = pq[1]; + + ADMA_LL_DBG(prep_dma_pqzero_sum_dbg(ppc440spe_chan->device->id, + src, src_cnt, scf)); + + /* Always use WXOR for P/Q calculations (two destinations). + * Need 1 or 2 extra slots to verify results are zero. + */ + idst = dst_cnt = (pdest && qdest) ? 2 : 1; + + /* One additional slot per destination to clone P/Q + * before calculation (we have to preserve destinations). + */ + slot_cnt = src_cnt + dst_cnt * 2; + slots_per_op = 1; + + spin_lock_bh(&ppc440spe_chan->lock); + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, + slots_per_op); + if (sw_desc) { + ppc440spe_desc_init_dma01pqzero_sum(sw_desc, dst_cnt, src_cnt); + + /* Setup byte count for each slot just allocated */ + sw_desc->async_tx.flags = flags; + list_for_each_entry(iter, &sw_desc->group_list, chain_node) { + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, + len); + iter->unmap_len = len; + } + + if (pdest) { + struct dma_cdb *hw_desc; + struct ppc440spe_adma_chan *chan; + + iter = sw_desc->group_head; + chan = to_ppc440spe_adma_chan(iter->async_tx.chan); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + iter->src_cnt = 0; + iter->dst_cnt = 0; + ppc440spe_desc_set_dest_addr(iter, chan, 0, + ppc440spe_chan->pdest, 0); + ppc440spe_desc_set_src_addr(iter, chan, 0, 0, pdest); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, + len); + iter->unmap_len = 0; + /* override pdest to preserve original P */ + pdest = ppc440spe_chan->pdest; + } + if (qdest) { + struct dma_cdb *hw_desc; + struct ppc440spe_adma_chan *chan; + + iter = list_first_entry(&sw_desc->group_list, + struct ppc440spe_adma_desc_slot, + chain_node); + chan = to_ppc440spe_adma_chan(iter->async_tx.chan); + + if (pdest) { + iter = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + } + + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + iter->src_cnt = 0; + iter->dst_cnt = 0; + ppc440spe_desc_set_dest_addr(iter, chan, 0, + ppc440spe_chan->qdest, 0); + ppc440spe_desc_set_src_addr(iter, chan, 0, 0, qdest); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, + len); + iter->unmap_len = 0; + /* override qdest to preserve original Q */ + qdest = ppc440spe_chan->qdest; + } + + /* Setup destinations for P/Q ops */ + ppc440spe_adma_pqzero_sum_set_dest(sw_desc, pdest, qdest); + + /* Setup zero QWORDs into DCHECK CDBs */ + idst = dst_cnt; + list_for_each_entry_reverse(iter, &sw_desc->group_list, + chain_node) { + /* + * The last CDB corresponds to Q-parity check, + * the one before last CDB corresponds + * P-parity check + */ + if (idst == DMA_DEST_MAX_NUM) { + if (idst == dst_cnt) { + set_bit(PPC440SPE_DESC_QCHECK, + &iter->flags); + } else { + set_bit(PPC440SPE_DESC_PCHECK, + &iter->flags); + } + } else { + if (qdest) { + set_bit(PPC440SPE_DESC_QCHECK, + &iter->flags); + } else { + set_bit(PPC440SPE_DESC_PCHECK, + &iter->flags); + } + } + iter->xor_check_result = pqres; + + /* + * set it to zero, if check fail then result will + * be updated + */ + *iter->xor_check_result = 0; + ppc440spe_desc_set_dcheck(iter, ppc440spe_chan, + ppc440spe_qword); + + if (!(--dst_cnt)) + break; + } + + /* Setup sources and mults for P/Q ops */ + list_for_each_entry_continue_reverse(iter, &sw_desc->group_list, + chain_node) { + struct ppc440spe_adma_chan *chan; + u32 mult_dst; + + chan = to_ppc440spe_adma_chan(iter->async_tx.chan); + ppc440spe_desc_set_src_addr(iter, chan, 0, + DMA_CUED_XOR_HB, + src[src_cnt - 1]); + if (qdest) { + mult_dst = (dst_cnt - 1) ? DMA_CDB_SG_DST2 : + DMA_CDB_SG_DST1; + ppc440spe_desc_set_src_mult(iter, chan, + DMA_CUED_MULT1_OFF, + mult_dst, + scf[src_cnt - 1]); + } + if (!(--src_cnt)) + break; + } + } + spin_unlock_bh(&ppc440spe_chan->lock); + return sw_desc ? &sw_desc->async_tx : NULL; +} + +/** + * ppc440spe_adma_prep_dma_xor_zero_sum - prepare CDB group for + * XOR ZERO_SUM operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_xor_zero_sum( + struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt, + size_t len, enum sum_check_flags *result, unsigned long flags) +{ + struct dma_async_tx_descriptor *tx; + dma_addr_t pq[2]; + + /* validate P, disable Q */ + pq[0] = src[0]; + pq[1] = 0; + flags |= DMA_PREP_PQ_DISABLE_Q; + + tx = ppc440spe_adma_prep_dma_pqzero_sum(chan, pq, &src[1], + src_cnt - 1, 0, len, + result, flags); + return tx; +} + +/** + * ppc440spe_adma_set_dest - set destination address into descriptor + */ +static void ppc440spe_adma_set_dest(struct ppc440spe_adma_desc_slot *sw_desc, + dma_addr_t addr, int index) +{ + struct ppc440spe_adma_chan *chan; + + BUG_ON(index >= sw_desc->dst_cnt); + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + /* to do: support transfers lengths > + * PPC440SPE_ADMA_DMA/XOR_MAX_BYTE_COUNT + */ + ppc440spe_desc_set_dest_addr(sw_desc->group_head, + chan, 0, addr, index); + break; + case PPC440SPE_XOR_ID: + sw_desc = ppc440spe_get_group_entry(sw_desc, index); + ppc440spe_desc_set_dest_addr(sw_desc, + chan, 0, addr, index); + break; + } +} + +static void ppc440spe_adma_pq_zero_op(struct ppc440spe_adma_desc_slot *iter, + struct ppc440spe_adma_chan *chan, dma_addr_t addr) +{ + /* To clear destinations update the descriptor + * (P or Q depending on index) as follows: + * addr is destination (0 corresponds to SG2): + */ + ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, addr, 0); + + /* ... and the addr is source: */ + ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, addr); + + /* addr is always SG2 then the mult is always DST1 */ + ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, + DMA_CDB_SG_DST1, 1); +} + +/** + * ppc440spe_adma_pq_set_dest - set destination address into descriptor + * for the PQXOR operation + */ +static void ppc440spe_adma_pq_set_dest(struct ppc440spe_adma_desc_slot *sw_desc, + dma_addr_t *addrs, unsigned long flags) +{ + struct ppc440spe_adma_desc_slot *iter; + struct ppc440spe_adma_chan *chan; + dma_addr_t paddr, qaddr; + dma_addr_t addr = 0, ppath, qpath; + int index = 0, i; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + + if (flags & DMA_PREP_PQ_DISABLE_P) + paddr = 0; + else + paddr = addrs[0]; + + if (flags & DMA_PREP_PQ_DISABLE_Q) + qaddr = 0; + else + qaddr = addrs[1]; + + if (!paddr || !qaddr) + addr = paddr ? paddr : qaddr; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + /* walk through the WXOR source list and set P/Q-destinations + * for each slot: + */ + if (!test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) { + /* This is WXOR-only chain; may have 1/2 zero descs */ + if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags)) + index++; + if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags)) + index++; + + iter = ppc440spe_get_group_entry(sw_desc, index); + if (addr) { + /* one destination */ + list_for_each_entry_from(iter, + &sw_desc->group_list, chain_node) + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, addr, 0); + } else { + /* two destinations */ + list_for_each_entry_from(iter, + &sw_desc->group_list, chain_node) { + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, paddr, 0); + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, qaddr, 1); + } + } + + if (index) { + /* To clear destinations update the descriptor + * (1st,2nd, or both depending on flags) + */ + index = 0; + if (test_bit(PPC440SPE_ZERO_P, + &sw_desc->flags)) { + iter = ppc440spe_get_group_entry( + sw_desc, index++); + ppc440spe_adma_pq_zero_op(iter, chan, + paddr); + } + + if (test_bit(PPC440SPE_ZERO_Q, + &sw_desc->flags)) { + iter = ppc440spe_get_group_entry( + sw_desc, index++); + ppc440spe_adma_pq_zero_op(iter, chan, + qaddr); + } + + return; + } + } else { + /* This is RXOR-only or RXOR/WXOR mixed chain */ + + /* If we want to include destination into calculations, + * then make dest addresses cued with mult=1 (XOR). + */ + ppath = test_bit(PPC440SPE_ZERO_P, &sw_desc->flags) ? + DMA_CUED_XOR_HB : + DMA_CUED_XOR_BASE | + (1 << DMA_CUED_MULT1_OFF); + qpath = test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags) ? + DMA_CUED_XOR_HB : + DMA_CUED_XOR_BASE | + (1 << DMA_CUED_MULT1_OFF); + + /* Setup destination(s) in RXOR slot(s) */ + iter = ppc440spe_get_group_entry(sw_desc, index++); + ppc440spe_desc_set_dest_addr(iter, chan, + paddr ? ppath : qpath, + paddr ? paddr : qaddr, 0); + if (!addr) { + /* two destinations */ + iter = ppc440spe_get_group_entry(sw_desc, + index++); + ppc440spe_desc_set_dest_addr(iter, chan, + qpath, qaddr, 0); + } + + if (test_bit(PPC440SPE_DESC_WXOR, &sw_desc->flags)) { + /* Setup destination(s) in remaining WXOR + * slots + */ + iter = ppc440spe_get_group_entry(sw_desc, + index); + if (addr) { + /* one destination */ + list_for_each_entry_from(iter, + &sw_desc->group_list, + chain_node) + ppc440spe_desc_set_dest_addr( + iter, chan, + DMA_CUED_XOR_BASE, + addr, 0); + + } else { + /* two destinations */ + list_for_each_entry_from(iter, + &sw_desc->group_list, + chain_node) { + ppc440spe_desc_set_dest_addr( + iter, chan, + DMA_CUED_XOR_BASE, + paddr, 0); + ppc440spe_desc_set_dest_addr( + iter, chan, + DMA_CUED_XOR_BASE, + qaddr, 1); + } + } + } + + } + break; + + case PPC440SPE_XOR_ID: + /* DMA2 descriptors have only 1 destination, so there are + * two chains - one for each dest. + * If we want to include destination into calculations, + * then make dest addresses cued with mult=1 (XOR). + */ + ppath = test_bit(PPC440SPE_ZERO_P, &sw_desc->flags) ? + DMA_CUED_XOR_HB : + DMA_CUED_XOR_BASE | + (1 << DMA_CUED_MULT1_OFF); + + qpath = test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags) ? + DMA_CUED_XOR_HB : + DMA_CUED_XOR_BASE | + (1 << DMA_CUED_MULT1_OFF); + + iter = ppc440spe_get_group_entry(sw_desc, 0); + for (i = 0; i < sw_desc->descs_per_op; i++) { + ppc440spe_desc_set_dest_addr(iter, chan, + paddr ? ppath : qpath, + paddr ? paddr : qaddr, 0); + iter = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + } + + if (!addr) { + /* Two destinations; setup Q here */ + iter = ppc440spe_get_group_entry(sw_desc, + sw_desc->descs_per_op); + for (i = 0; i < sw_desc->descs_per_op; i++) { + ppc440spe_desc_set_dest_addr(iter, + chan, qpath, qaddr, 0); + iter = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + } + } + + break; + } +} + +/** + * ppc440spe_adma_pq_zero_sum_set_dest - set destination address into descriptor + * for the PQ_ZERO_SUM operation + */ +static void ppc440spe_adma_pqzero_sum_set_dest( + struct ppc440spe_adma_desc_slot *sw_desc, + dma_addr_t paddr, dma_addr_t qaddr) +{ + struct ppc440spe_adma_desc_slot *iter, *end; + struct ppc440spe_adma_chan *chan; + dma_addr_t addr = 0; + int idx; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + + /* walk through the WXOR source list and set P/Q-destinations + * for each slot + */ + idx = (paddr && qaddr) ? 2 : 1; + /* set end */ + list_for_each_entry_reverse(end, &sw_desc->group_list, + chain_node) { + if (!(--idx)) + break; + } + /* set start */ + idx = (paddr && qaddr) ? 2 : 1; + iter = ppc440spe_get_group_entry(sw_desc, idx); + + if (paddr && qaddr) { + /* two destinations */ + list_for_each_entry_from(iter, &sw_desc->group_list, + chain_node) { + if (unlikely(iter == end)) + break; + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, paddr, 0); + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, qaddr, 1); + } + } else { + /* one destination */ + addr = paddr ? paddr : qaddr; + list_for_each_entry_from(iter, &sw_desc->group_list, + chain_node) { + if (unlikely(iter == end)) + break; + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, addr, 0); + } + } + + /* The remaining descriptors are DATACHECK. These have no need in + * destination. Actually, these destinations are used there + * as sources for check operation. So, set addr as source. + */ + ppc440spe_desc_set_src_addr(end, chan, 0, 0, addr ? addr : paddr); + + if (!addr) { + end = list_entry(end->chain_node.next, + struct ppc440spe_adma_desc_slot, chain_node); + ppc440spe_desc_set_src_addr(end, chan, 0, 0, qaddr); + } +} + +/** + * ppc440spe_desc_set_xor_src_cnt - set source count into descriptor + */ +static inline void ppc440spe_desc_set_xor_src_cnt( + struct ppc440spe_adma_desc_slot *desc, + int src_cnt) +{ + struct xor_cb *hw_desc = desc->hw_desc; + + hw_desc->cbc &= ~XOR_CDCR_OAC_MSK; + hw_desc->cbc |= src_cnt; +} + +/** + * ppc440spe_adma_pq_set_src - set source address into descriptor + */ +static void ppc440spe_adma_pq_set_src(struct ppc440spe_adma_desc_slot *sw_desc, + dma_addr_t addr, int index) +{ + struct ppc440spe_adma_chan *chan; + dma_addr_t haddr = 0; + struct ppc440spe_adma_desc_slot *iter = NULL; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + /* DMA0,1 may do: WXOR, RXOR, RXOR+WXORs chain + */ + if (test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) { + /* RXOR-only or RXOR/WXOR operation */ + int iskip = test_bit(PPC440SPE_DESC_RXOR12, + &sw_desc->flags) ? 2 : 3; + + if (index == 0) { + /* 1st slot (RXOR) */ + /* setup sources region (R1-2-3, R1-2-4, + * or R1-2-5) + */ + if (test_bit(PPC440SPE_DESC_RXOR12, + &sw_desc->flags)) + haddr = DMA_RXOR12 << + DMA_CUED_REGION_OFF; + else if (test_bit(PPC440SPE_DESC_RXOR123, + &sw_desc->flags)) + haddr = DMA_RXOR123 << + DMA_CUED_REGION_OFF; + else if (test_bit(PPC440SPE_DESC_RXOR124, + &sw_desc->flags)) + haddr = DMA_RXOR124 << + DMA_CUED_REGION_OFF; + else if (test_bit(PPC440SPE_DESC_RXOR125, + &sw_desc->flags)) + haddr = DMA_RXOR125 << + DMA_CUED_REGION_OFF; + else + BUG(); + haddr |= DMA_CUED_XOR_BASE; + iter = ppc440spe_get_group_entry(sw_desc, 0); + } else if (index < iskip) { + /* 1st slot (RXOR) + * shall actually set source address only once + * instead of first <iskip> + */ + iter = NULL; + } else { + /* 2nd/3d and next slots (WXOR); + * skip first slot with RXOR + */ + haddr = DMA_CUED_XOR_HB; + iter = ppc440spe_get_group_entry(sw_desc, + index - iskip + sw_desc->dst_cnt); + } + } else { + int znum = 0; + + /* WXOR-only operation; skip first slots with + * zeroing destinations + */ + if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags)) + znum++; + if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags)) + znum++; + + haddr = DMA_CUED_XOR_HB; + iter = ppc440spe_get_group_entry(sw_desc, + index + znum); + } + + if (likely(iter)) { + ppc440spe_desc_set_src_addr(iter, chan, 0, haddr, addr); + + if (!index && + test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags) && + sw_desc->dst_cnt == 2) { + /* if we have two destinations for RXOR, then + * setup source in the second descr too + */ + iter = ppc440spe_get_group_entry(sw_desc, 1); + ppc440spe_desc_set_src_addr(iter, chan, 0, + haddr, addr); + } + } + break; + + case PPC440SPE_XOR_ID: + /* DMA2 may do Biskup */ + iter = sw_desc->group_head; + if (iter->dst_cnt == 2) { + /* both P & Q calculations required; set P src here */ + ppc440spe_adma_dma2rxor_set_src(iter, index, addr); + + /* this is for Q */ + iter = ppc440spe_get_group_entry(sw_desc, + sw_desc->descs_per_op); + } + ppc440spe_adma_dma2rxor_set_src(iter, index, addr); + break; + } +} + +/** + * ppc440spe_adma_memcpy_xor_set_src - set source address into descriptor + */ +static void ppc440spe_adma_memcpy_xor_set_src( + struct ppc440spe_adma_desc_slot *sw_desc, + dma_addr_t addr, int index) +{ + struct ppc440spe_adma_chan *chan; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + sw_desc = sw_desc->group_head; + + if (likely(sw_desc)) + ppc440spe_desc_set_src_addr(sw_desc, chan, index, 0, addr); +} + +/** + * ppc440spe_adma_dma2rxor_inc_addr - + */ +static void ppc440spe_adma_dma2rxor_inc_addr( + struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_rxor *cursor, int index, int src_cnt) +{ + cursor->addr_count++; + if (index == src_cnt - 1) { + ppc440spe_desc_set_xor_src_cnt(desc, cursor->addr_count); + } else if (cursor->addr_count == XOR_MAX_OPS) { + ppc440spe_desc_set_xor_src_cnt(desc, cursor->addr_count); + cursor->addr_count = 0; + cursor->desc_count++; + } +} + +/** + * ppc440spe_adma_dma2rxor_prep_src - setup RXOR types in DMA2 CDB + */ +static int ppc440spe_adma_dma2rxor_prep_src( + struct ppc440spe_adma_desc_slot *hdesc, + struct ppc440spe_rxor *cursor, int index, + int src_cnt, u32 addr) +{ + int rval = 0; + u32 sign; + struct ppc440spe_adma_desc_slot *desc = hdesc; + int i; + + for (i = 0; i < cursor->desc_count; i++) { + desc = list_entry(hdesc->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + } + + switch (cursor->state) { + case 0: + if (addr == cursor->addrl + cursor->len) { + /* direct RXOR */ + cursor->state = 1; + cursor->xor_count++; + if (index == src_cnt-1) { + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR12 << DMA_CUED_REGION_OFF); + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + } else if (cursor->addrl == addr + cursor->len) { + /* reverse RXOR */ + cursor->state = 1; + cursor->xor_count++; + set_bit(cursor->addr_count, &desc->reverse_flags[0]); + if (index == src_cnt-1) { + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR12 << DMA_CUED_REGION_OFF); + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + } else { + printk(KERN_ERR "Cannot build " + "DMA2 RXOR command block.\n"); + BUG(); + } + break; + case 1: + sign = test_bit(cursor->addr_count, + desc->reverse_flags) + ? -1 : 1; + if (index == src_cnt-2 || (sign == -1 + && addr != cursor->addrl - 2*cursor->len)) { + cursor->state = 0; + cursor->xor_count = 1; + cursor->addrl = addr; + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR12 << DMA_CUED_REGION_OFF); + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } else if (addr == cursor->addrl + 2*sign*cursor->len) { + cursor->state = 2; + cursor->xor_count = 0; + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR123 << DMA_CUED_REGION_OFF); + if (index == src_cnt-1) { + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + } else if (addr == cursor->addrl + 3*cursor->len) { + cursor->state = 2; + cursor->xor_count = 0; + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR124 << DMA_CUED_REGION_OFF); + if (index == src_cnt-1) { + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + } else if (addr == cursor->addrl + 4*cursor->len) { + cursor->state = 2; + cursor->xor_count = 0; + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR125 << DMA_CUED_REGION_OFF); + if (index == src_cnt-1) { + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + } else { + cursor->state = 0; + cursor->xor_count = 1; + cursor->addrl = addr; + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR12 << DMA_CUED_REGION_OFF); + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + break; + case 2: + cursor->state = 0; + cursor->addrl = addr; + cursor->xor_count++; + if (index) { + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + break; + } + + return rval; +} + +/** + * ppc440spe_adma_dma2rxor_set_src - set RXOR source address; it's assumed that + * ppc440spe_adma_dma2rxor_prep_src() has already done prior this call + */ +static void ppc440spe_adma_dma2rxor_set_src( + struct ppc440spe_adma_desc_slot *desc, + int index, dma_addr_t addr) +{ + struct xor_cb *xcb = desc->hw_desc; + int k = 0, op = 0, lop = 0; + + /* get the RXOR operand which corresponds to index addr */ + while (op <= index) { + lop = op; + if (k == XOR_MAX_OPS) { + k = 0; + desc = list_entry(desc->chain_node.next, + struct ppc440spe_adma_desc_slot, chain_node); + xcb = desc->hw_desc; + + } + if ((xcb->ops[k++].h & (DMA_RXOR12 << DMA_CUED_REGION_OFF)) == + (DMA_RXOR12 << DMA_CUED_REGION_OFF)) + op += 2; + else + op += 3; + } + + BUG_ON(k < 1); + + if (test_bit(k-1, desc->reverse_flags)) { + /* reverse operand order; put last op in RXOR group */ + if (index == op - 1) + ppc440spe_rxor_set_src(desc, k - 1, addr); + } else { + /* direct operand order; put first op in RXOR group */ + if (index == lop) + ppc440spe_rxor_set_src(desc, k - 1, addr); + } +} + +/** + * ppc440spe_adma_dma2rxor_set_mult - set RXOR multipliers; it's assumed that + * ppc440spe_adma_dma2rxor_prep_src() has already done prior this call + */ +static void ppc440spe_adma_dma2rxor_set_mult( + struct ppc440spe_adma_desc_slot *desc, + int index, u8 mult) +{ + struct xor_cb *xcb = desc->hw_desc; + int k = 0, op = 0, lop = 0; + + /* get the RXOR operand which corresponds to index mult */ + while (op <= index) { + lop = op; + if (k == XOR_MAX_OPS) { + k = 0; + desc = list_entry(desc->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + xcb = desc->hw_desc; + + } + if ((xcb->ops[k++].h & (DMA_RXOR12 << DMA_CUED_REGION_OFF)) == + (DMA_RXOR12 << DMA_CUED_REGION_OFF)) + op += 2; + else + op += 3; + } + + BUG_ON(k < 1); + if (test_bit(k-1, desc->reverse_flags)) { + /* reverse order */ + ppc440spe_rxor_set_mult(desc, k - 1, op - index - 1, mult); + } else { + /* direct order */ + ppc440spe_rxor_set_mult(desc, k - 1, index - lop, mult); + } +} + +/** + * ppc440spe_init_rxor_cursor - + */ +static void ppc440spe_init_rxor_cursor(struct ppc440spe_rxor *cursor) +{ + memset(cursor, 0, sizeof(struct ppc440spe_rxor)); + cursor->state = 2; +} + +/** + * ppc440spe_adma_pq_set_src_mult - set multiplication coefficient into + * descriptor for the PQXOR operation + */ +static void ppc440spe_adma_pq_set_src_mult( + struct ppc440spe_adma_desc_slot *sw_desc, + unsigned char mult, int index, int dst_pos) +{ + struct ppc440spe_adma_chan *chan; + u32 mult_idx, mult_dst; + struct ppc440spe_adma_desc_slot *iter = NULL, *iter1 = NULL; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + if (test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) { + int region = test_bit(PPC440SPE_DESC_RXOR12, + &sw_desc->flags) ? 2 : 3; + + if (index < region) { + /* RXOR multipliers */ + iter = ppc440spe_get_group_entry(sw_desc, + sw_desc->dst_cnt - 1); + if (sw_desc->dst_cnt == 2) + iter1 = ppc440spe_get_group_entry( + sw_desc, 0); + + mult_idx = DMA_CUED_MULT1_OFF + (index << 3); + mult_dst = DMA_CDB_SG_SRC; + } else { + /* WXOR multiplier */ + iter = ppc440spe_get_group_entry(sw_desc, + index - region + + sw_desc->dst_cnt); + mult_idx = DMA_CUED_MULT1_OFF; + mult_dst = dst_pos ? DMA_CDB_SG_DST2 : + DMA_CDB_SG_DST1; + } + } else { + int znum = 0; + + /* WXOR-only; + * skip first slots with destinations (if ZERO_DST has + * place) + */ + if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags)) + znum++; + if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags)) + znum++; + + iter = ppc440spe_get_group_entry(sw_desc, index + znum); + mult_idx = DMA_CUED_MULT1_OFF; + mult_dst = dst_pos ? DMA_CDB_SG_DST2 : DMA_CDB_SG_DST1; + } + + if (likely(iter)) { + ppc440spe_desc_set_src_mult(iter, chan, + mult_idx, mult_dst, mult); + + if (unlikely(iter1)) { + /* if we have two destinations for RXOR, then + * we've just set Q mult. Set-up P now. + */ + ppc440spe_desc_set_src_mult(iter1, chan, + mult_idx, mult_dst, 1); + } + + } + break; + + case PPC440SPE_XOR_ID: + iter = sw_desc->group_head; + if (sw_desc->dst_cnt == 2) { + /* both P & Q calculations required; set P mult here */ + ppc440spe_adma_dma2rxor_set_mult(iter, index, 1); + + /* and then set Q mult */ + iter = ppc440spe_get_group_entry(sw_desc, + sw_desc->descs_per_op); + } + ppc440spe_adma_dma2rxor_set_mult(iter, index, mult); + break; + } +} + +/** + * ppc440spe_adma_free_chan_resources - free the resources allocated + */ +static void ppc440spe_adma_free_chan_resources(struct dma_chan *chan) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *iter, *_iter; + int in_use_descs = 0; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + ppc440spe_adma_slot_cleanup(ppc440spe_chan); + + spin_lock_bh(&ppc440spe_chan->lock); + list_for_each_entry_safe(iter, _iter, &ppc440spe_chan->chain, + chain_node) { + in_use_descs++; + list_del(&iter->chain_node); + } + list_for_each_entry_safe_reverse(iter, _iter, + &ppc440spe_chan->all_slots, slot_node) { + list_del(&iter->slot_node); + kfree(iter); + ppc440spe_chan->slots_allocated--; + } + ppc440spe_chan->last_used = NULL; + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d %s slots_allocated %d\n", + ppc440spe_chan->device->id, + __func__, ppc440spe_chan->slots_allocated); + spin_unlock_bh(&ppc440spe_chan->lock); + + /* one is ok since we left it on there on purpose */ + if (in_use_descs > 1) + printk(KERN_ERR "SPE: Freeing %d in use descriptors!\n", + in_use_descs - 1); +} + +/** + * ppc440spe_adma_is_complete - poll the status of an ADMA transaction + * @chan: ADMA channel handle + * @cookie: ADMA transaction identifier + */ +static enum dma_status ppc440spe_adma_is_complete(struct dma_chan *chan, + dma_cookie_t cookie, dma_cookie_t *done, dma_cookie_t *used) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + dma_cookie_t last_used; + dma_cookie_t last_complete; + enum dma_status ret; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + last_used = chan->cookie; + last_complete = ppc440spe_chan->completed_cookie; + + if (done) + *done = last_complete; + if (used) + *used = last_used; + + ret = dma_async_is_complete(cookie, last_complete, last_used); + if (ret == DMA_SUCCESS) + return ret; + + ppc440spe_adma_slot_cleanup(ppc440spe_chan); + + last_used = chan->cookie; + last_complete = ppc440spe_chan->completed_cookie; + + if (done) + *done = last_complete; + if (used) + *used = last_used; + + return dma_async_is_complete(cookie, last_complete, last_used); +} + +/** + * ppc440spe_adma_eot_handler - end of transfer interrupt handler + */ +static irqreturn_t ppc440spe_adma_eot_handler(int irq, void *data) +{ + struct ppc440spe_adma_chan *chan = data; + + dev_dbg(chan->device->common.dev, + "ppc440spe adma%d: %s\n", chan->device->id, __func__); + + tasklet_schedule(&chan->irq_tasklet); + ppc440spe_adma_device_clear_eot_status(chan); + + return IRQ_HANDLED; +} + +/** + * ppc440spe_adma_err_handler - DMA error interrupt handler; + * do the same things as a eot handler + */ +static irqreturn_t ppc440spe_adma_err_handler(int irq, void *data) +{ + struct ppc440spe_adma_chan *chan = data; + + dev_dbg(chan->device->common.dev, + "ppc440spe adma%d: %s\n", chan->device->id, __func__); + + tasklet_schedule(&chan->irq_tasklet); + ppc440spe_adma_device_clear_eot_status(chan); + + return IRQ_HANDLED; +} + +/** + * ppc440spe_test_callback - called when test operation has been done + */ +static void ppc440spe_test_callback(void *unused) +{ + complete(&ppc440spe_r6_test_comp); +} + +/** + * ppc440spe_adma_issue_pending - flush all pending descriptors to h/w + */ +static void ppc440spe_adma_issue_pending(struct dma_chan *chan) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: %s %d \n", ppc440spe_chan->device->id, + __func__, ppc440spe_chan->pending); + + if (ppc440spe_chan->pending) { + ppc440spe_chan->pending = 0; + ppc440spe_chan_append(ppc440spe_chan); + } +} + +/** + * ppc440spe_chan_start_null_xor - initiate the first XOR operation (DMA engines + * use FIFOs (as opposite to chains used in XOR) so this is a XOR + * specific operation) + */ +static void ppc440spe_chan_start_null_xor(struct ppc440spe_adma_chan *chan) +{ + struct ppc440spe_adma_desc_slot *sw_desc, *group_start; + dma_cookie_t cookie; + int slot_cnt, slots_per_op; + + dev_dbg(chan->device->common.dev, + "ppc440spe adma%d: %s\n", chan->device->id, __func__); + + spin_lock_bh(&chan->lock); + slot_cnt = ppc440spe_chan_xor_slot_count(0, 2, &slots_per_op); + sw_desc = ppc440spe_adma_alloc_slots(chan, slot_cnt, slots_per_op); + if (sw_desc) { + group_start = sw_desc->group_head; + list_splice_init(&sw_desc->group_list, &chan->chain); + async_tx_ack(&sw_desc->async_tx); + ppc440spe_desc_init_null_xor(group_start); + + cookie = chan->common.cookie; + cookie++; + if (cookie <= 1) + cookie = 2; + + /* initialize the completed cookie to be less than + * the most recently used cookie + */ + chan->completed_cookie = cookie - 1; + chan->common.cookie = sw_desc->async_tx.cookie = cookie; + + /* channel should not be busy */ + BUG_ON(ppc440spe_chan_is_busy(chan)); + + /* set the descriptor address */ + ppc440spe_chan_set_first_xor_descriptor(chan, sw_desc); + + /* run the descriptor */ + ppc440spe_chan_run(chan); + } else + printk(KERN_ERR "ppc440spe adma%d" + " failed to allocate null descriptor\n", + chan->device->id); + spin_unlock_bh(&chan->lock); +} + +/** + * ppc440spe_test_raid6 - test are RAID-6 capabilities enabled successfully. + * For this we just perform one WXOR operation with the same source + * and destination addresses, the GF-multiplier is 1; so if RAID-6 + * capabilities are enabled then we'll get src/dst filled with zero. + */ +static int ppc440spe_test_raid6(struct ppc440spe_adma_chan *chan) +{ + struct ppc440spe_adma_desc_slot *sw_desc, *iter; + struct page *pg; + char *a; + dma_addr_t dma_addr, addrs[2]; + unsigned long op = 0; + int rval = 0; + + set_bit(PPC440SPE_DESC_WXOR, &op); + + pg = alloc_page(GFP_KERNEL); + if (!pg) + return -ENOMEM; + + spin_lock_bh(&chan->lock); + sw_desc = ppc440spe_adma_alloc_slots(chan, 1, 1); + if (sw_desc) { + /* 1 src, 1 dsr, int_ena, WXOR */ + ppc440spe_desc_init_dma01pq(sw_desc, 1, 1, 1, op); + list_for_each_entry(iter, &sw_desc->group_list, chain_node) { + ppc440spe_desc_set_byte_count(iter, chan, PAGE_SIZE); + iter->unmap_len = PAGE_SIZE; + } + } else { + rval = -EFAULT; + spin_unlock_bh(&chan->lock); + goto exit; + } + spin_unlock_bh(&chan->lock); + + /* Fill the test page with ones */ + memset(page_address(pg), 0xFF, PAGE_SIZE); + dma_addr = dma_map_page(chan->device->dev, pg, 0, + PAGE_SIZE, DMA_BIDIRECTIONAL); + + /* Setup addresses */ + ppc440spe_adma_pq_set_src(sw_desc, dma_addr, 0); + ppc440spe_adma_pq_set_src_mult(sw_desc, 1, 0, 0); + addrs[0] = dma_addr; + addrs[1] = 0; + ppc440spe_adma_pq_set_dest(sw_desc, addrs, DMA_PREP_PQ_DISABLE_Q); + + async_tx_ack(&sw_desc->async_tx); + sw_desc->async_tx.callback = ppc440spe_test_callback; + sw_desc->async_tx.callback_param = NULL; + + init_completion(&ppc440spe_r6_test_comp); + + ppc440spe_adma_tx_submit(&sw_desc->async_tx); + ppc440spe_adma_issue_pending(&chan->common); + + wait_for_completion(&ppc440spe_r6_test_comp); + + /* Now check if the test page is zeroed */ + a = page_address(pg); + if ((*(u32 *)a) == 0 && memcmp(a, a+4, PAGE_SIZE-4) == 0) { + /* page is zero - RAID-6 enabled */ + rval = 0; + } else { + /* RAID-6 was not enabled */ + rval = -EINVAL; + } +exit: + __free_page(pg); + return rval; +} + +static void ppc440spe_adma_init_capabilities(struct ppc440spe_adma_device *adev) +{ + switch (adev->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_cap_set(DMA_MEMCPY, adev->common.cap_mask); + dma_cap_set(DMA_INTERRUPT, adev->common.cap_mask); + dma_cap_set(DMA_MEMSET, adev->common.cap_mask); + dma_cap_set(DMA_PQ, adev->common.cap_mask); + dma_cap_set(DMA_PQ_VAL, adev->common.cap_mask); + dma_cap_set(DMA_XOR_VAL, adev->common.cap_mask); + break; + case PPC440SPE_XOR_ID: + dma_cap_set(DMA_XOR, adev->common.cap_mask); + dma_cap_set(DMA_PQ, adev->common.cap_mask); + dma_cap_set(DMA_INTERRUPT, adev->common.cap_mask); + adev->common.cap_mask = adev->common.cap_mask; + break; + } + + /* Set base routines */ + adev->common.device_alloc_chan_resources = + ppc440spe_adma_alloc_chan_resources; + adev->common.device_free_chan_resources = + ppc440spe_adma_free_chan_resources; + adev->common.device_is_tx_complete = ppc440spe_adma_is_complete; + adev->common.device_issue_pending = ppc440spe_adma_issue_pending; + + /* Set prep routines based on capability */ + if (dma_has_cap(DMA_MEMCPY, adev->common.cap_mask)) { + adev->common.device_prep_dma_memcpy = + ppc440spe_adma_prep_dma_memcpy; + } + if (dma_has_cap(DMA_MEMSET, adev->common.cap_mask)) { + adev->common.device_prep_dma_memset = + ppc440spe_adma_prep_dma_memset; + } + if (dma_has_cap(DMA_XOR, adev->common.cap_mask)) { + adev->common.max_xor = XOR_MAX_OPS; + adev->common.device_prep_dma_xor = + ppc440spe_adma_prep_dma_xor; + } + if (dma_has_cap(DMA_PQ, adev->common.cap_mask)) { + switch (adev->id) { + case PPC440SPE_DMA0_ID: + dma_set_maxpq(&adev->common, + DMA0_FIFO_SIZE / sizeof(struct dma_cdb), 0); + break; + case PPC440SPE_DMA1_ID: + dma_set_maxpq(&adev->common, + DMA1_FIFO_SIZE / sizeof(struct dma_cdb), 0); + break; + case PPC440SPE_XOR_ID: + adev->common.max_pq = XOR_MAX_OPS * 3; + break; + } + adev->common.device_prep_dma_pq = + ppc440spe_adma_prep_dma_pq; + } + if (dma_has_cap(DMA_PQ_VAL, adev->common.cap_mask)) { + switch (adev->id) { + case PPC440SPE_DMA0_ID: + adev->common.max_pq = DMA0_FIFO_SIZE / + sizeof(struct dma_cdb); + break; + case PPC440SPE_DMA1_ID: + adev->common.max_pq = DMA1_FIFO_SIZE / + sizeof(struct dma_cdb); + break; + } + adev->common.device_prep_dma_pq_val = + ppc440spe_adma_prep_dma_pqzero_sum; + } + if (dma_has_cap(DMA_XOR_VAL, adev->common.cap_mask)) { + switch (adev->id) { + case PPC440SPE_DMA0_ID: + adev->common.max_xor = DMA0_FIFO_SIZE / + sizeof(struct dma_cdb); + break; + case PPC440SPE_DMA1_ID: + adev->common.max_xor = DMA1_FIFO_SIZE / + sizeof(struct dma_cdb); + break; + } + adev->common.device_prep_dma_xor_val = + ppc440spe_adma_prep_dma_xor_zero_sum; + } + if (dma_has_cap(DMA_INTERRUPT, adev->common.cap_mask)) { + adev->common.device_prep_dma_interrupt = + ppc440spe_adma_prep_dma_interrupt; + } + pr_info("%s: AMCC(R) PPC440SP(E) ADMA Engine: " + "( %s%s%s%s%s%s%s)\n", + dev_name(adev->dev), + dma_has_cap(DMA_PQ, adev->common.cap_mask) ? "pq " : "", + dma_has_cap(DMA_PQ_VAL, adev->common.cap_mask) ? "pq_val " : "", + dma_has_cap(DMA_XOR, adev->common.cap_mask) ? "xor " : "", + dma_has_cap(DMA_XOR_VAL, adev->common.cap_mask) ? "xor_val " : "", + dma_has_cap(DMA_MEMCPY, adev->common.cap_mask) ? "memcpy " : "", + dma_has_cap(DMA_MEMSET, adev->common.cap_mask) ? "memset " : "", + dma_has_cap(DMA_INTERRUPT, adev->common.cap_mask) ? "intr " : ""); +} + +static int ppc440spe_adma_setup_irqs(struct ppc440spe_adma_device *adev, + struct ppc440spe_adma_chan *chan, + int *initcode) +{ + struct device_node *np; + int ret; + + np = container_of(adev->dev, struct of_device, dev)->node; + if (adev->id != PPC440SPE_XOR_ID) { + adev->err_irq = irq_of_parse_and_map(np, 1); + if (adev->err_irq == NO_IRQ) { + dev_warn(adev->dev, "no err irq resource?\n"); + *initcode = PPC_ADMA_INIT_IRQ2; + adev->err_irq = -ENXIO; + } else + atomic_inc(&ppc440spe_adma_err_irq_ref); + } else { + adev->err_irq = -ENXIO; + } + + adev->irq = irq_of_parse_and_map(np, 0); + if (adev->irq == NO_IRQ) { + dev_err(adev->dev, "no irq resource\n"); + *initcode = PPC_ADMA_INIT_IRQ1; + ret = -ENXIO; + goto err_irq_map; + } + dev_dbg(adev->dev, "irq %d, err irq %d\n", + adev->irq, adev->err_irq); + + ret = request_irq(adev->irq, ppc440spe_adma_eot_handler, + 0, dev_driver_string(adev->dev), chan); + if (ret) { + dev_err(adev->dev, "can't request irq %d\n", + adev->irq); + *initcode = PPC_ADMA_INIT_IRQ1; + ret = -EIO; + goto err_req1; + } + + /* only DMA engines have a separate error IRQ + * so it's Ok if err_irq < 0 in XOR engine case. + */ + if (adev->err_irq > 0) { + /* both DMA engines share common error IRQ */ + ret = request_irq(adev->err_irq, + ppc440spe_adma_err_handler, + IRQF_SHARED, + dev_driver_string(adev->dev), + chan); + if (ret) { + dev_err(adev->dev, "can't request irq %d\n", + adev->err_irq); + *initcode = PPC_ADMA_INIT_IRQ2; + ret = -EIO; + goto err_req2; + } + } + + if (adev->id == PPC440SPE_XOR_ID) { + /* enable XOR engine interrupts */ + iowrite32be(XOR_IE_CBCIE_BIT | XOR_IE_ICBIE_BIT | + XOR_IE_ICIE_BIT | XOR_IE_RPTIE_BIT, + &adev->xor_reg->ier); + } else { + u32 mask, enable; + + np = of_find_compatible_node(NULL, NULL, "ibm,i2o-440spe"); + if (!np) { + pr_err("%s: can't find I2O device tree node\n", + __func__); + ret = -ENODEV; + goto err_req2; + } + adev->i2o_reg = of_iomap(np, 0); + if (!adev->i2o_reg) { + pr_err("%s: failed to map I2O registers\n", __func__); + of_node_put(np); + ret = -EINVAL; + goto err_req2; + } + of_node_put(np); + /* Unmask 'CS FIFO Attention' interrupts and + * enable generating interrupts on errors + */ + enable = (adev->id == PPC440SPE_DMA0_ID) ? + ~(I2O_IOPIM_P0SNE | I2O_IOPIM_P0EM) : + ~(I2O_IOPIM_P1SNE | I2O_IOPIM_P1EM); + mask = ioread32(&adev->i2o_reg->iopim) & enable; + iowrite32(mask, &adev->i2o_reg->iopim); + } + return 0; + +err_req2: + free_irq(adev->irq, chan); +err_req1: + irq_dispose_mapping(adev->irq); +err_irq_map: + if (adev->err_irq > 0) { + if (atomic_dec_and_test(&ppc440spe_adma_err_irq_ref)) + irq_dispose_mapping(adev->err_irq); + } + return ret; +} + +static void ppc440spe_adma_release_irqs(struct ppc440spe_adma_device *adev, + struct ppc440spe_adma_chan *chan) +{ + u32 mask, disable; + + if (adev->id == PPC440SPE_XOR_ID) { + /* disable XOR engine interrupts */ + mask = ioread32be(&adev->xor_reg->ier); + mask &= ~(XOR_IE_CBCIE_BIT | XOR_IE_ICBIE_BIT | + XOR_IE_ICIE_BIT | XOR_IE_RPTIE_BIT); + iowrite32be(mask, &adev->xor_reg->ier); + } else { + /* disable DMAx engine interrupts */ + disable = (adev->id == PPC440SPE_DMA0_ID) ? + (I2O_IOPIM_P0SNE | I2O_IOPIM_P0EM) : + (I2O_IOPIM_P1SNE | I2O_IOPIM_P1EM); + mask = ioread32(&adev->i2o_reg->iopim) | disable; + iowrite32(mask, &adev->i2o_reg->iopim); + } + free_irq(adev->irq, chan); + irq_dispose_mapping(adev->irq); + if (adev->err_irq > 0) { + free_irq(adev->err_irq, chan); + if (atomic_dec_and_test(&ppc440spe_adma_err_irq_ref)) { + irq_dispose_mapping(adev->err_irq); + iounmap(adev->i2o_reg); + } + } +} + +/** + * ppc440spe_adma_probe - probe the asynch device + */ +static int __devinit ppc440spe_adma_probe(struct of_device *ofdev, + const struct of_device_id *match) +{ + struct device_node *np = ofdev->node; + struct resource res; + struct ppc440spe_adma_device *adev; + struct ppc440spe_adma_chan *chan; + struct ppc_dma_chan_ref *ref, *_ref; + int ret = 0, initcode = PPC_ADMA_INIT_OK; + const u32 *idx; + int len; + void *regs; + u32 id, pool_size; + + if (of_device_is_compatible(np, "amcc,xor-accelerator")) { + id = PPC440SPE_XOR_ID; + /* As far as the XOR engine is concerned, it does not + * use FIFOs but uses linked list. So there is no dependency + * between pool size to allocate and the engine configuration. + */ + pool_size = PAGE_SIZE << 1; + } else { + /* it is DMA0 or DMA1 */ + idx = of_get_property(np, "cell-index", &len); + if (!idx || (len != sizeof(u32))) { + dev_err(&ofdev->dev, "Device node %s has missing " + "or invalid cell-index property\n", + np->full_name); + return -EINVAL; + } + id = *idx; + /* DMA0,1 engines use FIFO to maintain CDBs, so we + * should allocate the pool accordingly to size of this + * FIFO. Thus, the pool size depends on the FIFO depth: + * how much CDBs pointers the FIFO may contain then so + * much CDBs we should provide in the pool. + * That is + * CDB size = 32B; + * CDBs number = (DMA0_FIFO_SIZE >> 3); + * Pool size = CDBs number * CDB size = + * = (DMA0_FIFO_SIZE >> 3) << 5 = DMA0_FIFO_SIZE << 2. + */ + pool_size = (id == PPC440SPE_DMA0_ID) ? + DMA0_FIFO_SIZE : DMA1_FIFO_SIZE; + pool_size <<= 2; + } + + if (of_address_to_resource(np, 0, &res)) { + dev_err(&ofdev->dev, "failed to get memory resource\n"); + initcode = PPC_ADMA_INIT_MEMRES; + ret = -ENODEV; + goto out; + } + + if (!request_mem_region(res.start, resource_size(&res), + dev_driver_string(&ofdev->dev))) { + dev_err(&ofdev->dev, "failed to request memory region " + "(0x%016llx-0x%016llx)\n", + (u64)res.start, (u64)res.end); + initcode = PPC_ADMA_INIT_MEMREG; + ret = -EBUSY; + goto out; + } + + /* create a device */ + adev = kzalloc(sizeof(*adev), GFP_KERNEL); + if (!adev) { + dev_err(&ofdev->dev, "failed to allocate device\n"); + initcode = PPC_ADMA_INIT_ALLOC; + ret = -ENOMEM; + goto err_adev_alloc; + } + + adev->id = id; + adev->pool_size = pool_size; + /* allocate coherent memory for hardware descriptors */ + adev->dma_desc_pool_virt = dma_alloc_coherent(&ofdev->dev, + adev->pool_size, &adev->dma_desc_pool, + GFP_KERNEL); + if (adev->dma_desc_pool_virt == NULL) { + dev_err(&ofdev->dev, "failed to allocate %d bytes of coherent " + "memory for hardware descriptors\n", + adev->pool_size); + initcode = PPC_ADMA_INIT_COHERENT; + ret = -ENOMEM; + goto err_dma_alloc; + } + dev_dbg(&ofdev->dev, "allocted descriptor pool virt 0x%p phys 0x%llx\n", + adev->dma_desc_pool_virt, (u64)adev->dma_desc_pool); + + regs = ioremap(res.start, resource_size(&res)); + if (!regs) { + dev_err(&ofdev->dev, "failed to ioremap regs!\n"); + goto err_regs_alloc; + } + + if (adev->id == PPC440SPE_XOR_ID) { + adev->xor_reg = regs; + /* Reset XOR */ + iowrite32be(XOR_CRSR_XASR_BIT, &adev->xor_reg->crsr); + iowrite32be(XOR_CRSR_64BA_BIT, &adev->xor_reg->crrr); + } else { + size_t fifo_size = (adev->id == PPC440SPE_DMA0_ID) ? + DMA0_FIFO_SIZE : DMA1_FIFO_SIZE; + adev->dma_reg = regs; + /* DMAx_FIFO_SIZE is defined in bytes, + * <fsiz> - is defined in number of CDB pointers (8byte). + * DMA FIFO Length = CSlength + CPlength, where + * CSlength = CPlength = (fsiz + 1) * 8. + */ + iowrite32(DMA_FIFO_ENABLE | ((fifo_size >> 3) - 2), + &adev->dma_reg->fsiz); + /* Configure DMA engine */ + iowrite32(DMA_CFG_DXEPR_HP | DMA_CFG_DFMPP_HP | DMA_CFG_FALGN, + &adev->dma_reg->cfg); + /* Clear Status */ + iowrite32(~0, &adev->dma_reg->dsts); + } + + adev->dev = &ofdev->dev; + adev->common.dev = &ofdev->dev; + INIT_LIST_HEAD(&adev->common.channels); + dev_set_drvdata(&ofdev->dev, adev); + + /* create a channel */ + chan = kzalloc(sizeof(*chan), GFP_KERNEL); + if (!chan) { + dev_err(&ofdev->dev, "can't allocate channel structure\n"); + initcode = PPC_ADMA_INIT_CHANNEL; + ret = -ENOMEM; + goto err_chan_alloc; + } + + spin_lock_init(&chan->lock); + INIT_LIST_HEAD(&chan->chain); + INIT_LIST_HEAD(&chan->all_slots); + chan->device = adev; + chan->common.device = &adev->common; + list_add_tail(&chan->common.device_node, &adev->common.channels); + tasklet_init(&chan->irq_tasklet, ppc440spe_adma_tasklet, + (unsigned long)chan); + + /* allocate and map helper pages for async validation or + * async_mult/async_sum_product operations on DMA0/1. + */ + if (adev->id != PPC440SPE_XOR_ID) { + chan->pdest_page = alloc_page(GFP_KERNEL); + chan->qdest_page = alloc_page(GFP_KERNEL); + if (!chan->pdest_page || + !chan->qdest_page) { + if (chan->pdest_page) + __free_page(chan->pdest_page); + if (chan->qdest_page) + __free_page(chan->qdest_page); + ret = -ENOMEM; + goto err_page_alloc; + } + chan->pdest = dma_map_page(&ofdev->dev, chan->pdest_page, 0, + PAGE_SIZE, DMA_BIDIRECTIONAL); + chan->qdest = dma_map_page(&ofdev->dev, chan->qdest_page, 0, + PAGE_SIZE, DMA_BIDIRECTIONAL); + } + + ref = kmalloc(sizeof(*ref), GFP_KERNEL); + if (ref) { + ref->chan = &chan->common; + INIT_LIST_HEAD(&ref->node); + list_add_tail(&ref->node, &ppc440spe_adma_chan_list); + } else { + dev_err(&ofdev->dev, "failed to allocate channel reference!\n"); + ret = -ENOMEM; + goto err_ref_alloc; + } + + ret = ppc440spe_adma_setup_irqs(adev, chan, &initcode); + if (ret) + goto err_irq; + + ppc440spe_adma_init_capabilities(adev); + + ret = dma_async_device_register(&adev->common); + if (ret) { + initcode = PPC_ADMA_INIT_REGISTER; + dev_err(&ofdev->dev, "failed to register dma device\n"); + goto err_dev_reg; + } + + goto out; + +err_dev_reg: + ppc440spe_adma_release_irqs(adev, chan); +err_irq: + list_for_each_entry_safe(ref, _ref, &ppc440spe_adma_chan_list, node) { + if (chan == to_ppc440spe_adma_chan(ref->chan)) { + list_del(&ref->node); + kfree(ref); + } + } +err_ref_alloc: + if (adev->id != PPC440SPE_XOR_ID) { + dma_unmap_page(&ofdev->dev, chan->pdest, + PAGE_SIZE, DMA_BIDIRECTIONAL); + dma_unmap_page(&ofdev->dev, chan->qdest, + PAGE_SIZE, DMA_BIDIRECTIONAL); + __free_page(chan->pdest_page); + __free_page(chan->qdest_page); + } +err_page_alloc: + kfree(chan); +err_chan_alloc: + if (adev->id == PPC440SPE_XOR_ID) + iounmap(adev->xor_reg); + else + iounmap(adev->dma_reg); +err_regs_alloc: + dma_free_coherent(adev->dev, adev->pool_size, + adev->dma_desc_pool_virt, + adev->dma_desc_pool); +err_dma_alloc: + kfree(adev); +err_adev_alloc: + release_mem_region(res.start, resource_size(&res)); +out: + if (id < PPC440SPE_ADMA_ENGINES_NUM) + ppc440spe_adma_devices[id] = initcode; + + return ret; +} + +/** + * ppc440spe_adma_remove - remove the asynch device + */ +static int __devexit ppc440spe_adma_remove(struct of_device *ofdev) +{ + struct ppc440spe_adma_device *adev = dev_get_drvdata(&ofdev->dev); + struct device_node *np = ofdev->node; + struct resource res; + struct dma_chan *chan, *_chan; + struct ppc_dma_chan_ref *ref, *_ref; + struct ppc440spe_adma_chan *ppc440spe_chan; + + dev_set_drvdata(&ofdev->dev, NULL); + if (adev->id < PPC440SPE_ADMA_ENGINES_NUM) + ppc440spe_adma_devices[adev->id] = -1; + + dma_async_device_unregister(&adev->common); + + list_for_each_entry_safe(chan, _chan, &adev->common.channels, + device_node) { + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + ppc440spe_adma_release_irqs(adev, ppc440spe_chan); + tasklet_kill(&ppc440spe_chan->irq_tasklet); + if (adev->id != PPC440SPE_XOR_ID) { + dma_unmap_page(&ofdev->dev, ppc440spe_chan->pdest, + PAGE_SIZE, DMA_BIDIRECTIONAL); + dma_unmap_page(&ofdev->dev, ppc440spe_chan->qdest, + PAGE_SIZE, DMA_BIDIRECTIONAL); + __free_page(ppc440spe_chan->pdest_page); + __free_page(ppc440spe_chan->qdest_page); + } + list_for_each_entry_safe(ref, _ref, &ppc440spe_adma_chan_list, + node) { + if (ppc440spe_chan == + to_ppc440spe_adma_chan(ref->chan)) { + list_del(&ref->node); + kfree(ref); + } + } + list_del(&chan->device_node); + kfree(ppc440spe_chan); + } + + dma_free_coherent(adev->dev, adev->pool_size, + adev->dma_desc_pool_virt, adev->dma_desc_pool); + if (adev->id == PPC440SPE_XOR_ID) + iounmap(adev->xor_reg); + else + iounmap(adev->dma_reg); + of_address_to_resource(np, 0, &res); + release_mem_region(res.start, resource_size(&res)); + kfree(adev); + return 0; +} + +/* + * /sys driver interface to enable h/w RAID-6 capabilities + * Files created in e.g. /sys/devices/plb.0/400100100.dma0/driver/ + * directory are "devices", "enable" and "poly". + * "devices" shows available engines. + * "enable" is used to enable RAID-6 capabilities or to check + * whether these has been activated. + * "poly" allows setting/checking used polynomial (for PPC440SPe only). + */ + +static ssize_t show_ppc440spe_devices(struct device_driver *dev, char *buf) +{ + ssize_t size = 0; + int i; + + for (i = 0; i < PPC440SPE_ADMA_ENGINES_NUM; i++) { + if (ppc440spe_adma_devices[i] == -1) + continue; + size += snprintf(buf + size, PAGE_SIZE - size, + "PPC440SP(E)-ADMA.%d: %s\n", i, + ppc_adma_errors[ppc440spe_adma_devices[i]]); + } + return size; +} + +static ssize_t show_ppc440spe_r6enable(struct device_driver *dev, char *buf) +{ + return snprintf(buf, PAGE_SIZE, + "PPC440SP(e) RAID-6 capabilities are %sABLED.\n", + ppc440spe_r6_enabled ? "EN" : "DIS"); +} + +static ssize_t store_ppc440spe_r6enable(struct device_driver *dev, + const char *buf, size_t count) +{ + unsigned long val; + + if (!count || count > 11) + return -EINVAL; + + if (!ppc440spe_r6_tchan) + return -EFAULT; + + /* Write a key */ + sscanf(buf, "%lx", &val); + dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_XORBA, val); + isync(); + + /* Verify whether it really works now */ + if (ppc440spe_test_raid6(ppc440spe_r6_tchan) == 0) { + pr_info("PPC440SP(e) RAID-6 has been activated " + "successfully\n"); + ppc440spe_r6_enabled = 1; + } else { + pr_info("PPC440SP(e) RAID-6 hasn't been activated!" + " Error key ?\n"); + ppc440spe_r6_enabled = 0; + } + return count; +} + +static ssize_t show_ppc440spe_r6poly(struct device_driver *dev, char *buf) +{ + ssize_t size = 0; + u32 reg; + +#ifdef CONFIG_440SP + /* 440SP has fixed polynomial */ + reg = 0x4d; +#else + reg = dcr_read(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL); + reg >>= MQ0_CFBHL_POLY; + reg &= 0xFF; +#endif + + size = snprintf(buf, PAGE_SIZE, "PPC440SP(e) RAID-6 driver " + "uses 0x1%02x polynomial.\n", reg); + return size; +} + +static ssize_t store_ppc440spe_r6poly(struct device_driver *dev, + const char *buf, size_t count) +{ + unsigned long reg, val; + +#ifdef CONFIG_440SP + /* 440SP uses default 0x14D polynomial only */ + return -EINVAL; +#endif + + if (!count || count > 6) + return -EINVAL; + + /* e.g., 0x14D or 0x11D */ + sscanf(buf, "%lx", &val); + + if (val & ~0x1FF) + return -EINVAL; + + val &= 0xFF; + reg = dcr_read(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL); + reg &= ~(0xFF << MQ0_CFBHL_POLY); + reg |= val << MQ0_CFBHL_POLY; + dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL, reg); + + return count; +} + +static DRIVER_ATTR(devices, S_IRUGO, show_ppc440spe_devices, NULL); +static DRIVER_ATTR(enable, S_IRUGO | S_IWUSR, show_ppc440spe_r6enable, + store_ppc440spe_r6enable); +static DRIVER_ATTR(poly, S_IRUGO | S_IWUSR, show_ppc440spe_r6poly, + store_ppc440spe_r6poly); + +/* + * Common initialisation for RAID engines; allocate memory for + * DMAx FIFOs, perform configuration common for all DMA engines. + * Further DMA engine specific configuration is done at probe time. + */ +static int ppc440spe_configure_raid_devices(void) +{ + struct device_node *np; + struct resource i2o_res; + struct i2o_regs __iomem *i2o_reg; + dcr_host_t i2o_dcr_host; + unsigned int dcr_base, dcr_len; + int i, ret; + + np = of_find_compatible_node(NULL, NULL, "ibm,i2o-440spe"); + if (!np) { + pr_err("%s: can't find I2O device tree node\n", + __func__); + return -ENODEV; + } + + if (of_address_to_resource(np, 0, &i2o_res)) { + of_node_put(np); + return -EINVAL; + } + + i2o_reg = of_iomap(np, 0); + if (!i2o_reg) { + pr_err("%s: failed to map I2O registers\n", __func__); + of_node_put(np); + return -EINVAL; + } + + /* Get I2O DCRs base */ + dcr_base = dcr_resource_start(np, 0); + dcr_len = dcr_resource_len(np, 0); + if (!dcr_base && !dcr_len) { + pr_err("%s: can't get DCR registers base/len!\n", + np->full_name); + of_node_put(np); + iounmap(i2o_reg); + return -ENODEV; + } + + i2o_dcr_host = dcr_map(np, dcr_base, dcr_len); + if (!DCR_MAP_OK(i2o_dcr_host)) { + pr_err("%s: failed to map DCRs!\n", np->full_name); + of_node_put(np); + iounmap(i2o_reg); + return -ENODEV; + } + of_node_put(np); + + /* Provide memory regions for DMA's FIFOs: I2O, DMA0 and DMA1 share + * the base address of FIFO memory space. + * Actually we need twice more physical memory than programmed in the + * <fsiz> register (because there are two FIFOs for each DMA: CP and CS) + */ + ppc440spe_dma_fifo_buf = kmalloc((DMA0_FIFO_SIZE + DMA1_FIFO_SIZE) << 1, + GFP_KERNEL); + if (!ppc440spe_dma_fifo_buf) { + pr_err("%s: DMA FIFO buffer allocation failed.\n", __func__); + iounmap(i2o_reg); + dcr_unmap(i2o_dcr_host, dcr_len); + return -ENOMEM; + } + + /* + * Configure h/w + */ + /* Reset I2O/DMA */ + mtdcri(SDR0, DCRN_SDR0_SRST, DCRN_SDR0_SRST_I2ODMA); + mtdcri(SDR0, DCRN_SDR0_SRST, 0); + + /* Setup the base address of mmaped registers */ + dcr_write(i2o_dcr_host, DCRN_I2O0_IBAH, (u32)(i2o_res.start >> 32)); + dcr_write(i2o_dcr_host, DCRN_I2O0_IBAL, (u32)(i2o_res.start) | + I2O_REG_ENABLE); + dcr_unmap(i2o_dcr_host, dcr_len); + + /* Setup FIFO memory space base address */ + iowrite32(0, &i2o_reg->ifbah); + iowrite32(((u32)__pa(ppc440spe_dma_fifo_buf)), &i2o_reg->ifbal); + + /* set zero FIFO size for I2O, so the whole + * ppc440spe_dma_fifo_buf is used by DMAs. + * DMAx_FIFOs will be configured while probe. + */ + iowrite32(0, &i2o_reg->ifsiz); + iounmap(i2o_reg); + + /* To prepare WXOR/RXOR functionality we need access to + * Memory Queue Module DCRs (finally it will be enabled + * via /sys interface of the ppc440spe ADMA driver). + */ + np = of_find_compatible_node(NULL, NULL, "ibm,mq-440spe"); + if (!np) { + pr_err("%s: can't find MQ device tree node\n", + __func__); + ret = -ENODEV; + goto out_free; + } + + /* Get MQ DCRs base */ + dcr_base = dcr_resource_start(np, 0); + dcr_len = dcr_resource_len(np, 0); + if (!dcr_base && !dcr_len) { + pr_err("%s: can't get DCR registers base/len!\n", + np->full_name); + ret = -ENODEV; + goto out_mq; + } + + ppc440spe_mq_dcr_host = dcr_map(np, dcr_base, dcr_len); + if (!DCR_MAP_OK(ppc440spe_mq_dcr_host)) { + pr_err("%s: failed to map DCRs!\n", np->full_name); + ret = -ENODEV; + goto out_mq; + } + of_node_put(np); + ppc440spe_mq_dcr_len = dcr_len; + + /* Set HB alias */ + dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_BAUH, DMA_CUED_XOR_HB); + + /* Set: + * - LL transaction passing limit to 1; + * - Memory controller cycle limit to 1; + * - Galois Polynomial to 0x14d (default) + */ + dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL, + (1 << MQ0_CFBHL_TPLM) | (1 << MQ0_CFBHL_HBCL) | + (PPC440SPE_DEFAULT_POLY << MQ0_CFBHL_POLY)); + + atomic_set(&ppc440spe_adma_err_irq_ref, 0); + for (i = 0; i < PPC440SPE_ADMA_ENGINES_NUM; i++) + ppc440spe_adma_devices[i] = -1; + + return 0; + +out_mq: + of_node_put(np); +out_free: + kfree(ppc440spe_dma_fifo_buf); + return ret; +} + +static struct of_device_id __devinitdata ppc440spe_adma_of_match[] = { + { .compatible = "ibm,dma-440spe", }, + { .compatible = "amcc,xor-accelerator", }, + {}, +}; +MODULE_DEVICE_TABLE(of, ppc440spe_adma_of_match); + +static struct of_platform_driver ppc440spe_adma_driver = { + .match_table = ppc440spe_adma_of_match, + .probe = ppc440spe_adma_probe, + .remove = __devexit_p(ppc440spe_adma_remove), + .driver = { + .name = "PPC440SP(E)-ADMA", + .owner = THIS_MODULE, + }, +}; + +static __init int ppc440spe_adma_init(void) +{ + int ret; + + ret = ppc440spe_configure_raid_devices(); + if (ret) + return ret; + + ret = of_register_platform_driver(&ppc440spe_adma_driver); + if (ret) { + pr_err("%s: failed to register platform driver\n", + __func__); + goto out_reg; + } + + /* Initialization status */ + ret = driver_create_file(&ppc440spe_adma_driver.driver, + &driver_attr_devices); + if (ret) + goto out_dev; + + /* RAID-6 h/w enable entry */ + ret = driver_create_file(&ppc440spe_adma_driver.driver, + &driver_attr_enable); + if (ret) + goto out_en; + + /* GF polynomial to use */ + ret = driver_create_file(&ppc440spe_adma_driver.driver, + &driver_attr_poly); + if (!ret) + return ret; + + driver_remove_file(&ppc440spe_adma_driver.driver, + &driver_attr_enable); +out_en: + driver_remove_file(&ppc440spe_adma_driver.driver, + &driver_attr_devices); +out_dev: + /* User will not be able to enable h/w RAID-6 */ + pr_err("%s: failed to create RAID-6 driver interface\n", + __func__); + of_unregister_platform_driver(&ppc440spe_adma_driver); +out_reg: + dcr_unmap(ppc440spe_mq_dcr_host, ppc440spe_mq_dcr_len); + kfree(ppc440spe_dma_fifo_buf); + return ret; +} + +static void __exit ppc440spe_adma_exit(void) +{ + driver_remove_file(&ppc440spe_adma_driver.driver, + &driver_attr_poly); + driver_remove_file(&ppc440spe_adma_driver.driver, + &driver_attr_enable); + driver_remove_file(&ppc440spe_adma_driver.driver, + &driver_attr_devices); + of_unregister_platform_driver(&ppc440spe_adma_driver); + dcr_unmap(ppc440spe_mq_dcr_host, ppc440spe_mq_dcr_len); + kfree(ppc440spe_dma_fifo_buf); +} + +arch_initcall(ppc440spe_adma_init); +module_exit(ppc440spe_adma_exit); + +MODULE_AUTHOR("Yuri Tikhonov <yur@emcraft.com>"); +MODULE_DESCRIPTION("PPC440SPE ADMA Engine Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/ppc4xx/adma.h b/drivers/dma/ppc4xx/adma.h new file mode 100644 index 000000000000..8ada5a812e3b --- /dev/null +++ b/drivers/dma/ppc4xx/adma.h @@ -0,0 +1,195 @@ +/* + * 2006-2009 (C) DENX Software Engineering. + * + * Author: Yuri Tikhonov <yur@emcraft.com> + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of + * any kind, whether express or implied. + */ + +#ifndef _PPC440SPE_ADMA_H +#define _PPC440SPE_ADMA_H + +#include <linux/types.h> +#include "dma.h" +#include "xor.h" + +#define to_ppc440spe_adma_chan(chan) \ + container_of(chan, struct ppc440spe_adma_chan, common) +#define to_ppc440spe_adma_device(dev) \ + container_of(dev, struct ppc440spe_adma_device, common) +#define tx_to_ppc440spe_adma_slot(tx) \ + container_of(tx, struct ppc440spe_adma_desc_slot, async_tx) + +/* Default polynomial (for 440SP is only available) */ +#define PPC440SPE_DEFAULT_POLY 0x4d + +#define PPC440SPE_ADMA_ENGINES_NUM (XOR_ENGINES_NUM + DMA_ENGINES_NUM) + +#define PPC440SPE_ADMA_WATCHDOG_MSEC 3 +#define PPC440SPE_ADMA_THRESHOLD 1 + +#define PPC440SPE_DMA0_ID 0 +#define PPC440SPE_DMA1_ID 1 +#define PPC440SPE_XOR_ID 2 + +#define PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT 0xFFFFFFUL +/* this is the XOR_CBBCR width */ +#define PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT (1 << 31) +#define PPC440SPE_ADMA_ZERO_SUM_MAX_BYTE_COUNT PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT + +#define PPC440SPE_RXOR_RUN 0 + +#define MQ0_CF2H_RXOR_BS_MASK 0x1FF + +#undef ADMA_LL_DEBUG + +/** + * struct ppc440spe_adma_device - internal representation of an ADMA device + * @dev: device + * @dma_reg: base for DMAx register access + * @xor_reg: base for XOR register access + * @i2o_reg: base for I2O register access + * @id: HW ADMA Device selector + * @dma_desc_pool_virt: base of DMA descriptor region (CPU address) + * @dma_desc_pool: base of DMA descriptor region (DMA address) + * @pool_size: size of the pool + * @irq: DMAx or XOR irq number + * @err_irq: DMAx error irq number + * @common: embedded struct dma_device + */ +struct ppc440spe_adma_device { + struct device *dev; + struct dma_regs __iomem *dma_reg; + struct xor_regs __iomem *xor_reg; + struct i2o_regs __iomem *i2o_reg; + int id; + void *dma_desc_pool_virt; + dma_addr_t dma_desc_pool; + size_t pool_size; + int irq; + int err_irq; + struct dma_device common; +}; + +/** + * struct ppc440spe_adma_chan - internal representation of an ADMA channel + * @lock: serializes enqueue/dequeue operations to the slot pool + * @device: parent device + * @chain: device chain view of the descriptors + * @common: common dmaengine channel object members + * @all_slots: complete domain of slots usable by the channel + * @pending: allows batching of hardware operations + * @completed_cookie: identifier for the most recently completed operation + * @slots_allocated: records the actual size of the descriptor slot pool + * @hw_chain_inited: h/w descriptor chain initialization flag + * @irq_tasklet: bottom half where ppc440spe_adma_slot_cleanup runs + * @needs_unmap: if buffers should not be unmapped upon final processing + * @pdest_page: P destination page for async validate operation + * @qdest_page: Q destination page for async validate operation + * @pdest: P dma addr for async validate operation + * @qdest: Q dma addr for async validate operation + */ +struct ppc440spe_adma_chan { + spinlock_t lock; + struct ppc440spe_adma_device *device; + struct list_head chain; + struct dma_chan common; + struct list_head all_slots; + struct ppc440spe_adma_desc_slot *last_used; + int pending; + dma_cookie_t completed_cookie; + int slots_allocated; + int hw_chain_inited; + struct tasklet_struct irq_tasklet; + u8 needs_unmap; + struct page *pdest_page; + struct page *qdest_page; + dma_addr_t pdest; + dma_addr_t qdest; +}; + +struct ppc440spe_rxor { + u32 addrl; + u32 addrh; + int len; + int xor_count; + int addr_count; + int desc_count; + int state; +}; + +/** + * struct ppc440spe_adma_desc_slot - PPC440SPE-ADMA software descriptor + * @phys: hardware address of the hardware descriptor chain + * @group_head: first operation in a transaction + * @hw_next: pointer to the next descriptor in chain + * @async_tx: support for the async_tx api + * @slot_node: node on the iop_adma_chan.all_slots list + * @chain_node: node on the op_adma_chan.chain list + * @group_list: list of slots that make up a multi-descriptor transaction + * for example transfer lengths larger than the supported hw max + * @unmap_len: transaction bytecount + * @hw_desc: virtual address of the hardware descriptor chain + * @stride: currently chained or not + * @idx: pool index + * @slot_cnt: total slots used in an transaction (group of operations) + * @src_cnt: number of sources set in this descriptor + * @dst_cnt: number of destinations set in the descriptor + * @slots_per_op: number of slots per operation + * @descs_per_op: number of slot per P/Q operation see comment + * for ppc440spe_prep_dma_pqxor function + * @flags: desc state/type + * @reverse_flags: 1 if a corresponding rxor address uses reversed address order + * @xor_check_result: result of zero sum + * @crc32_result: result crc calculation + */ +struct ppc440spe_adma_desc_slot { + dma_addr_t phys; + struct ppc440spe_adma_desc_slot *group_head; + struct ppc440spe_adma_desc_slot *hw_next; + struct dma_async_tx_descriptor async_tx; + struct list_head slot_node; + struct list_head chain_node; /* node in channel ops list */ + struct list_head group_list; /* list */ + unsigned int unmap_len; + void *hw_desc; + u16 stride; + u16 idx; + u16 slot_cnt; + u8 src_cnt; + u8 dst_cnt; + u8 slots_per_op; + u8 descs_per_op; + unsigned long flags; + unsigned long reverse_flags[8]; + +#define PPC440SPE_DESC_INT 0 /* generate interrupt on complete */ +#define PPC440SPE_ZERO_P 1 /* clear P destionaion */ +#define PPC440SPE_ZERO_Q 2 /* clear Q destination */ +#define PPC440SPE_COHERENT 3 /* src/dst are coherent */ + +#define PPC440SPE_DESC_WXOR 4 /* WXORs are in chain */ +#define PPC440SPE_DESC_RXOR 5 /* RXOR is in chain */ + +#define PPC440SPE_DESC_RXOR123 8 /* CDB for RXOR123 operation */ +#define PPC440SPE_DESC_RXOR124 9 /* CDB for RXOR124 operation */ +#define PPC440SPE_DESC_RXOR125 10 /* CDB for RXOR125 operation */ +#define PPC440SPE_DESC_RXOR12 11 /* CDB for RXOR12 operation */ +#define PPC440SPE_DESC_RXOR_REV 12 /* CDB has srcs in reversed order */ + +#define PPC440SPE_DESC_PCHECK 13 +#define PPC440SPE_DESC_QCHECK 14 + +#define PPC440SPE_DESC_RXOR_MSK 0x3 + + struct ppc440spe_rxor rxor_cursor; + + union { + u32 *xor_check_result; + u32 *crc32_result; + }; +}; + +#endif /* _PPC440SPE_ADMA_H */ diff --git a/drivers/dma/ppc4xx/dma.h b/drivers/dma/ppc4xx/dma.h new file mode 100644 index 000000000000..bcde2df2f373 --- /dev/null +++ b/drivers/dma/ppc4xx/dma.h @@ -0,0 +1,223 @@ +/* + * 440SPe's DMA engines support header file + * + * 2006-2009 (C) DENX Software Engineering. + * + * Author: Yuri Tikhonov <yur@emcraft.com> + * + * This file is licensed under the term of the GNU General Public License + * version 2. The program licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#ifndef _PPC440SPE_DMA_H +#define _PPC440SPE_DMA_H + +#include <linux/types.h> + +/* Number of elements in the array with statical CDBs */ +#define MAX_STAT_DMA_CDBS 16 +/* Number of DMA engines available on the contoller */ +#define DMA_ENGINES_NUM 2 + +/* Maximum h/w supported number of destinations */ +#define DMA_DEST_MAX_NUM 2 + +/* FIFO's params */ +#define DMA0_FIFO_SIZE 0x1000 +#define DMA1_FIFO_SIZE 0x1000 +#define DMA_FIFO_ENABLE (1<<12) + +/* DMA Configuration Register. Data Transfer Engine PLB Priority: */ +#define DMA_CFG_DXEPR_LP (0<<26) +#define DMA_CFG_DXEPR_HP (3<<26) +#define DMA_CFG_DXEPR_HHP (2<<26) +#define DMA_CFG_DXEPR_HHHP (1<<26) + +/* DMA Configuration Register. DMA FIFO Manager PLB Priority: */ +#define DMA_CFG_DFMPP_LP (0<<23) +#define DMA_CFG_DFMPP_HP (3<<23) +#define DMA_CFG_DFMPP_HHP (2<<23) +#define DMA_CFG_DFMPP_HHHP (1<<23) + +/* DMA Configuration Register. Force 64-byte Alignment */ +#define DMA_CFG_FALGN (1 << 19) + +/*UIC0:*/ +#define D0CPF_INT (1<<12) +#define D0CSF_INT (1<<11) +#define D1CPF_INT (1<<10) +#define D1CSF_INT (1<<9) +/*UIC1:*/ +#define DMAE_INT (1<<9) + +/* I2O IOP Interrupt Mask Register */ +#define I2O_IOPIM_P0SNE (1<<3) +#define I2O_IOPIM_P0EM (1<<5) +#define I2O_IOPIM_P1SNE (1<<6) +#define I2O_IOPIM_P1EM (1<<8) + +/* DMA CDB fields */ +#define DMA_CDB_MSK (0xF) +#define DMA_CDB_64B_ADDR (1<<2) +#define DMA_CDB_NO_INT (1<<3) +#define DMA_CDB_STATUS_MSK (0x3) +#define DMA_CDB_ADDR_MSK (0xFFFFFFF0) + +/* DMA CDB OpCodes */ +#define DMA_CDB_OPC_NO_OP (0x00) +#define DMA_CDB_OPC_MV_SG1_SG2 (0x01) +#define DMA_CDB_OPC_MULTICAST (0x05) +#define DMA_CDB_OPC_DFILL128 (0x24) +#define DMA_CDB_OPC_DCHECK128 (0x23) + +#define DMA_CUED_XOR_BASE (0x10000000) +#define DMA_CUED_XOR_HB (0x00000008) + +#ifdef CONFIG_440SP +#define DMA_CUED_MULT1_OFF 0 +#define DMA_CUED_MULT2_OFF 8 +#define DMA_CUED_MULT3_OFF 16 +#define DMA_CUED_REGION_OFF 24 +#define DMA_CUED_XOR_WIN_MSK (0xFC000000) +#else +#define DMA_CUED_MULT1_OFF 2 +#define DMA_CUED_MULT2_OFF 10 +#define DMA_CUED_MULT3_OFF 18 +#define DMA_CUED_REGION_OFF 26 +#define DMA_CUED_XOR_WIN_MSK (0xF0000000) +#endif + +#define DMA_CUED_REGION_MSK 0x3 +#define DMA_RXOR123 0x0 +#define DMA_RXOR124 0x1 +#define DMA_RXOR125 0x2 +#define DMA_RXOR12 0x3 + +/* S/G addresses */ +#define DMA_CDB_SG_SRC 1 +#define DMA_CDB_SG_DST1 2 +#define DMA_CDB_SG_DST2 3 + +/* + * DMAx engines Command Descriptor Block Type + */ +struct dma_cdb { + /* + * Basic CDB structure (Table 20-17, p.499, 440spe_um_1_22.pdf) + */ + u8 pad0[2]; /* reserved */ + u8 attr; /* attributes */ + u8 opc; /* opcode */ + u32 sg1u; /* upper SG1 address */ + u32 sg1l; /* lower SG1 address */ + u32 cnt; /* SG count, 3B used */ + u32 sg2u; /* upper SG2 address */ + u32 sg2l; /* lower SG2 address */ + u32 sg3u; /* upper SG3 address */ + u32 sg3l; /* lower SG3 address */ +}; + +/* + * DMAx hardware registers (p.515 in 440SPe UM 1.22) + */ +struct dma_regs { + u32 cpfpl; + u32 cpfph; + u32 csfpl; + u32 csfph; + u32 dsts; + u32 cfg; + u8 pad0[0x8]; + u16 cpfhp; + u16 cpftp; + u16 csfhp; + u16 csftp; + u8 pad1[0x8]; + u32 acpl; + u32 acph; + u32 s1bpl; + u32 s1bph; + u32 s2bpl; + u32 s2bph; + u32 s3bpl; + u32 s3bph; + u8 pad2[0x10]; + u32 earl; + u32 earh; + u8 pad3[0x8]; + u32 seat; + u32 sead; + u32 op; + u32 fsiz; +}; + +/* + * I2O hardware registers (p.528 in 440SPe UM 1.22) + */ +struct i2o_regs { + u32 ists; + u32 iseat; + u32 isead; + u8 pad0[0x14]; + u32 idbel; + u8 pad1[0xc]; + u32 ihis; + u32 ihim; + u8 pad2[0x8]; + u32 ihiq; + u32 ihoq; + u8 pad3[0x8]; + u32 iopis; + u32 iopim; + u32 iopiq; + u8 iopoq; + u8 pad4[3]; + u16 iiflh; + u16 iiflt; + u16 iiplh; + u16 iiplt; + u16 ioflh; + u16 ioflt; + u16 ioplh; + u16 ioplt; + u32 iidc; + u32 ictl; + u32 ifcpp; + u8 pad5[0x4]; + u16 mfac0; + u16 mfac1; + u16 mfac2; + u16 mfac3; + u16 mfac4; + u16 mfac5; + u16 mfac6; + u16 mfac7; + u16 ifcfh; + u16 ifcht; + u8 pad6[0x4]; + u32 iifmc; + u32 iodb; + u32 iodbc; + u32 ifbal; + u32 ifbah; + u32 ifsiz; + u32 ispd0; + u32 ispd1; + u32 ispd2; + u32 ispd3; + u32 ihipl; + u32 ihiph; + u32 ihopl; + u32 ihoph; + u32 iiipl; + u32 iiiph; + u32 iiopl; + u32 iioph; + u32 ifcpl; + u32 ifcph; + u8 pad7[0x8]; + u32 iopt; +}; + +#endif /* _PPC440SPE_DMA_H */ diff --git a/drivers/dma/ppc4xx/xor.h b/drivers/dma/ppc4xx/xor.h new file mode 100644 index 000000000000..daed7384daac --- /dev/null +++ b/drivers/dma/ppc4xx/xor.h @@ -0,0 +1,110 @@ +/* + * 440SPe's XOR engines support header file + * + * 2006-2009 (C) DENX Software Engineering. + * + * Author: Yuri Tikhonov <yur@emcraft.com> + * + * This file is licensed under the term of the GNU General Public License + * version 2. The program licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#ifndef _PPC440SPE_XOR_H +#define _PPC440SPE_XOR_H + +#include <linux/types.h> + +/* Number of XOR engines available on the contoller */ +#define XOR_ENGINES_NUM 1 + +/* Number of operands supported in the h/w */ +#define XOR_MAX_OPS 16 + +/* + * XOR Command Block Control Register bits + */ +#define XOR_CBCR_LNK_BIT (1<<31) /* link present */ +#define XOR_CBCR_TGT_BIT (1<<30) /* target present */ +#define XOR_CBCR_CBCE_BIT (1<<29) /* command block compete enable */ +#define XOR_CBCR_RNZE_BIT (1<<28) /* result not zero enable */ +#define XOR_CBCR_XNOR_BIT (1<<15) /* XOR/XNOR */ +#define XOR_CDCR_OAC_MSK (0x7F) /* operand address count */ + +/* + * XORCore Status Register bits + */ +#define XOR_SR_XCP_BIT (1<<31) /* core processing */ +#define XOR_SR_ICB_BIT (1<<17) /* invalid CB */ +#define XOR_SR_IC_BIT (1<<16) /* invalid command */ +#define XOR_SR_IPE_BIT (1<<15) /* internal parity error */ +#define XOR_SR_RNZ_BIT (1<<2) /* result not Zero */ +#define XOR_SR_CBC_BIT (1<<1) /* CB complete */ +#define XOR_SR_CBLC_BIT (1<<0) /* CB list complete */ + +/* + * XORCore Control Set and Reset Register bits + */ +#define XOR_CRSR_XASR_BIT (1<<31) /* soft reset */ +#define XOR_CRSR_XAE_BIT (1<<30) /* enable */ +#define XOR_CRSR_RCBE_BIT (1<<29) /* refetch CB enable */ +#define XOR_CRSR_PAUS_BIT (1<<28) /* pause */ +#define XOR_CRSR_64BA_BIT (1<<27) /* 64/32 CB format */ +#define XOR_CRSR_CLP_BIT (1<<25) /* continue list processing */ + +/* + * XORCore Interrupt Enable Register + */ +#define XOR_IE_ICBIE_BIT (1<<17) /* Invalid Command Block IRQ Enable */ +#define XOR_IE_ICIE_BIT (1<<16) /* Invalid Command IRQ Enable */ +#define XOR_IE_RPTIE_BIT (1<<14) /* Read PLB Timeout Error IRQ Enable */ +#define XOR_IE_CBCIE_BIT (1<<1) /* CB complete interrupt enable */ +#define XOR_IE_CBLCI_BIT (1<<0) /* CB list complete interrupt enable */ + +/* + * XOR Accelerator engine Command Block Type + */ +struct xor_cb { + /* + * Basic 64-bit format XOR CB (Table 19-1, p.463, 440spe_um_1_22.pdf) + */ + u32 cbc; /* control */ + u32 cbbc; /* byte count */ + u32 cbs; /* status */ + u8 pad0[4]; /* reserved */ + u32 cbtah; /* target address high */ + u32 cbtal; /* target address low */ + u32 cblah; /* link address high */ + u32 cblal; /* link address low */ + struct { + u32 h; + u32 l; + } __attribute__ ((packed)) ops[16]; +} __attribute__ ((packed)); + +/* + * XOR hardware registers Table 19-3, UM 1.22 + */ +struct xor_regs { + u32 op_ar[16][2]; /* operand address[0]-high,[1]-low registers */ + u8 pad0[352]; /* reserved */ + u32 cbcr; /* CB control register */ + u32 cbbcr; /* CB byte count register */ + u32 cbsr; /* CB status register */ + u8 pad1[4]; /* reserved */ + u32 cbtahr; /* operand target address high register */ + u32 cbtalr; /* operand target address low register */ + u32 cblahr; /* CB link address high register */ + u32 cblalr; /* CB link address low register */ + u32 crsr; /* control set register */ + u32 crrr; /* control reset register */ + u32 ccbahr; /* current CB address high register */ + u32 ccbalr; /* current CB address low register */ + u32 plbr; /* PLB configuration register */ + u32 ier; /* interrupt enable register */ + u32 pecr; /* parity error count register */ + u32 sr; /* status register */ + u32 revidr; /* revision ID register */ +}; + +#endif /* _PPC440SPE_XOR_H */ diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c index 034ecf0ace03..2e4a54c8afeb 100644 --- a/drivers/dma/shdma.c +++ b/drivers/dma/shdma.c @@ -80,17 +80,17 @@ static int sh_dmae_rst(int id) unsigned short dmaor; sh_dmae_ctl_stop(id); - dmaor = (dmaor_read_reg(id)|DMAOR_INIT); + dmaor = dmaor_read_reg(id) | DMAOR_INIT; dmaor_write_reg(id, dmaor); - if ((dmaor_read_reg(id) & (DMAOR_AE | DMAOR_NMIF))) { + if (dmaor_read_reg(id) & (DMAOR_AE | DMAOR_NMIF)) { pr_warning(KERN_ERR "dma-sh: Can't initialize DMAOR.\n"); return -EINVAL; } return 0; } -static int dmae_is_idle(struct sh_dmae_chan *sh_chan) +static int dmae_is_busy(struct sh_dmae_chan *sh_chan) { u32 chcr = sh_dmae_readl(sh_chan, CHCR); if (chcr & CHCR_DE) { @@ -110,15 +110,14 @@ static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs hw) { sh_dmae_writel(sh_chan, hw.sar, SAR); sh_dmae_writel(sh_chan, hw.dar, DAR); - sh_dmae_writel(sh_chan, - (hw.tcr >> calc_xmit_shift(sh_chan)), TCR); + sh_dmae_writel(sh_chan, hw.tcr >> calc_xmit_shift(sh_chan), TCR); } static void dmae_start(struct sh_dmae_chan *sh_chan) { u32 chcr = sh_dmae_readl(sh_chan, CHCR); - chcr |= (CHCR_DE|CHCR_IE); + chcr |= CHCR_DE | CHCR_IE; sh_dmae_writel(sh_chan, chcr, CHCR); } @@ -132,7 +131,7 @@ static void dmae_halt(struct sh_dmae_chan *sh_chan) static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val) { - int ret = dmae_is_idle(sh_chan); + int ret = dmae_is_busy(sh_chan); /* When DMA was working, can not set data to CHCR */ if (ret) return ret; @@ -149,7 +148,7 @@ static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val) { u32 addr; int shift = 0; - int ret = dmae_is_idle(sh_chan); + int ret = dmae_is_busy(sh_chan); if (ret) return ret; @@ -307,7 +306,7 @@ static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy( new = sh_dmae_get_desc(sh_chan); if (!new) { dev_err(sh_chan->dev, - "No free memory for link descriptor\n"); + "No free memory for link descriptor\n"); goto err_get_desc; } @@ -388,7 +387,7 @@ static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan) struct sh_dmae_regs hw; /* DMA work check */ - if (dmae_is_idle(sh_chan)) + if (dmae_is_busy(sh_chan)) return; /* Find the first un-transfer desciptor */ @@ -497,8 +496,9 @@ static void dmae_do_tasklet(unsigned long data) struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data; struct sh_desc *desc, *_desc, *cur_desc = NULL; u32 sar_buf = sh_dmae_readl(sh_chan, SAR); + list_for_each_entry_safe(desc, _desc, - &sh_chan->ld_queue, node) { + &sh_chan->ld_queue, node) { if ((desc->hw.sar + desc->hw.tcr) == sar_buf) { cur_desc = desc; break; @@ -543,8 +543,8 @@ static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id) /* alloc channel */ new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL); if (!new_sh_chan) { - dev_err(shdev->common.dev, "No free memory for allocating " - "dma channels!\n"); + dev_err(shdev->common.dev, + "No free memory for allocating dma channels!\n"); return -ENOMEM; } @@ -586,8 +586,8 @@ static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id) "sh-dmae%d", new_sh_chan->id); /* set up channel irq */ - err = request_irq(irq, &sh_dmae_interrupt, - irqflags, new_sh_chan->dev_id, new_sh_chan); + err = request_irq(irq, &sh_dmae_interrupt, irqflags, + new_sh_chan->dev_id, new_sh_chan); if (err) { dev_err(shdev->common.dev, "DMA channel %d request_irq error " "with return %d\n", id, err); @@ -676,6 +676,8 @@ static int __init sh_dmae_probe(struct platform_device *pdev) shdev->common.device_is_tx_complete = sh_dmae_is_complete; shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending; shdev->common.dev = &pdev->dev; + /* Default transfer size of 32 bytes requires 32-byte alignment */ + shdev->common.copy_align = 5; #if defined(CONFIG_CPU_SH4) /* Non Mix IRQ mode SH7722/SH7730 etc... */ @@ -688,8 +690,8 @@ static int __init sh_dmae_probe(struct platform_device *pdev) } for (ecnt = 0 ; ecnt < ARRAY_SIZE(eirq); ecnt++) { - err = request_irq(eirq[ecnt], sh_dmae_err, - irqflags, "DMAC Address Error", shdev); + err = request_irq(eirq[ecnt], sh_dmae_err, irqflags, + "DMAC Address Error", shdev); if (err) { dev_err(&pdev->dev, "DMA device request_irq" "error (irq %d) with return %d\n", diff --git a/drivers/dma/shdma.h b/drivers/dma/shdma.h index 2b4bc15a2c0a..60b81e529b42 100644 --- a/drivers/dma/shdma.h +++ b/drivers/dma/shdma.h @@ -35,15 +35,15 @@ struct sh_desc { struct sh_dmae_chan { dma_cookie_t completed_cookie; /* The maximum cookie completed */ - spinlock_t desc_lock; /* Descriptor operation lock */ - struct list_head ld_queue; /* Link descriptors queue */ - struct list_head ld_free; /* Link descriptors free */ - struct dma_chan common; /* DMA common channel */ - struct device *dev; /* Channel device */ + spinlock_t desc_lock; /* Descriptor operation lock */ + struct list_head ld_queue; /* Link descriptors queue */ + struct list_head ld_free; /* Link descriptors free */ + struct dma_chan common; /* DMA common channel */ + struct device *dev; /* Channel device */ struct tasklet_struct tasklet; /* Tasklet */ - int descs_allocated; /* desc count */ + int descs_allocated; /* desc count */ int id; /* Raw id of this channel */ - char dev_id[16]; /* unique name per DMAC of channel */ + char dev_id[16]; /* unique name per DMAC of channel */ /* Set chcr */ int (*set_chcr)(struct sh_dmae_chan *sh_chan, u32 regs); |
