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-rw-r--r--drivers/scsi/dec_esp.c573
1 files changed, 573 insertions, 0 deletions
diff --git a/drivers/scsi/dec_esp.c b/drivers/scsi/dec_esp.c
new file mode 100644
index 000000000000..315f95a0d6c0
--- /dev/null
+++ b/drivers/scsi/dec_esp.c
@@ -0,0 +1,573 @@
+/*
+ * dec_esp.c: Driver for SCSI chips on IOASIC based TURBOchannel DECstations
+ * and TURBOchannel PMAZ-A cards
+ *
+ * TURBOchannel changes by Harald Koerfgen
+ * PMAZ-A support by David Airlie
+ *
+ * based on jazz_esp.c:
+ * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
+ *
+ * jazz_esp is based on David S. Miller's ESP driver and cyber_esp
+ *
+ * 20000819 - Small PMAZ-AA fixes by Florian Lohoff <flo@rfc822.org>
+ * Be warned the PMAZ-AA works currently as a single card.
+ * Dont try to put multiple cards in one machine - They are
+ * both detected but it may crash under high load garbling your
+ * data.
+ * 20001005 - Initialization fixes for 2.4.0-test9
+ * Florian Lohoff <flo@rfc822.org>
+ *
+ * Copyright (C) 2002, 2003 Maciej W. Rozycki
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <linux/proc_fs.h>
+#include <linux/spinlock.h>
+#include <linux/stat.h>
+
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+
+#include <asm/dec/interrupts.h>
+#include <asm/dec/ioasic.h>
+#include <asm/dec/ioasic_addrs.h>
+#include <asm/dec/ioasic_ints.h>
+#include <asm/dec/machtype.h>
+#include <asm/dec/tc.h>
+
+#define DEC_SCSI_SREG 0
+#define DEC_SCSI_DMAREG 0x40000
+#define DEC_SCSI_SRAM 0x80000
+#define DEC_SCSI_DIAG 0xC0000
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "NCR53C9x.h"
+
+static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
+static void dma_drain(struct NCR_ESP *esp);
+static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp);
+static void dma_dump_state(struct NCR_ESP *esp);
+static void dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length);
+static void dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length);
+static void dma_ints_off(struct NCR_ESP *esp);
+static void dma_ints_on(struct NCR_ESP *esp);
+static int dma_irq_p(struct NCR_ESP *esp);
+static int dma_ports_p(struct NCR_ESP *esp);
+static void dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write);
+static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp);
+static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, struct scsi_cmnd * sp);
+static void dma_advance_sg(struct scsi_cmnd * sp);
+
+static void pmaz_dma_drain(struct NCR_ESP *esp);
+static void pmaz_dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length);
+static void pmaz_dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length);
+static void pmaz_dma_ints_off(struct NCR_ESP *esp);
+static void pmaz_dma_ints_on(struct NCR_ESP *esp);
+static void pmaz_dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write);
+static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp);
+
+#define TC_ESP_RAM_SIZE 0x20000
+#define ESP_TGT_DMA_SIZE ((TC_ESP_RAM_SIZE/7) & ~(sizeof(int)-1))
+#define ESP_NCMD 7
+
+#define TC_ESP_DMAR_MASK 0x1ffff
+#define TC_ESP_DMAR_WRITE 0x80000000
+#define TC_ESP_DMA_ADDR(x) ((unsigned)(x) & TC_ESP_DMAR_MASK)
+
+u32 esp_virt_buffer;
+int scsi_current_length;
+
+volatile unsigned char cmd_buffer[16];
+volatile unsigned char pmaz_cmd_buffer[16];
+ /* This is where all commands are put
+ * before they are trasfered to the ESP chip
+ * via PIO.
+ */
+
+static irqreturn_t scsi_dma_merr_int(int, void *, struct pt_regs *);
+static irqreturn_t scsi_dma_err_int(int, void *, struct pt_regs *);
+static irqreturn_t scsi_dma_int(int, void *, struct pt_regs *);
+
+static int dec_esp_detect(struct scsi_host_template * tpnt);
+
+static int dec_esp_release(struct Scsi_Host *shost)
+{
+ if (shost->irq)
+ free_irq(shost->irq, NULL);
+ if (shost->io_port && shost->n_io_port)
+ release_region(shost->io_port, shost->n_io_port);
+ scsi_unregister(shost);
+ return 0;
+}
+
+static struct scsi_host_template driver_template = {
+ .proc_name = "dec_esp",
+ .proc_info = esp_proc_info,
+ .name = "NCR53C94",
+ .detect = dec_esp_detect,
+ .slave_alloc = esp_slave_alloc,
+ .slave_destroy = esp_slave_destroy,
+ .release = dec_esp_release,
+ .info = esp_info,
+ .queuecommand = esp_queue,
+ .eh_abort_handler = esp_abort,
+ .eh_bus_reset_handler = esp_reset,
+ .can_queue = 7,
+ .this_id = 7,
+ .sg_tablesize = SG_ALL,
+ .cmd_per_lun = 1,
+ .use_clustering = DISABLE_CLUSTERING,
+};
+
+
+#include "scsi_module.c"
+
+/***************************************************************** Detection */
+static int dec_esp_detect(Scsi_Host_Template * tpnt)
+{
+ struct NCR_ESP *esp;
+ struct ConfigDev *esp_dev;
+ int slot;
+ unsigned long mem_start;
+
+ if (IOASIC) {
+ esp_dev = 0;
+ esp = esp_allocate(tpnt, (void *) esp_dev);
+
+ /* Do command transfer with programmed I/O */
+ esp->do_pio_cmds = 1;
+
+ /* Required functions */
+ esp->dma_bytes_sent = &dma_bytes_sent;
+ esp->dma_can_transfer = &dma_can_transfer;
+ esp->dma_dump_state = &dma_dump_state;
+ esp->dma_init_read = &dma_init_read;
+ esp->dma_init_write = &dma_init_write;
+ esp->dma_ints_off = &dma_ints_off;
+ esp->dma_ints_on = &dma_ints_on;
+ esp->dma_irq_p = &dma_irq_p;
+ esp->dma_ports_p = &dma_ports_p;
+ esp->dma_setup = &dma_setup;
+
+ /* Optional functions */
+ esp->dma_barrier = 0;
+ esp->dma_drain = &dma_drain;
+ esp->dma_invalidate = 0;
+ esp->dma_irq_entry = 0;
+ esp->dma_irq_exit = 0;
+ esp->dma_poll = 0;
+ esp->dma_reset = 0;
+ esp->dma_led_off = 0;
+ esp->dma_led_on = 0;
+
+ /* virtual DMA functions */
+ esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
+ esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
+ esp->dma_mmu_release_scsi_one = 0;
+ esp->dma_mmu_release_scsi_sgl = 0;
+ esp->dma_advance_sg = &dma_advance_sg;
+
+
+ /* SCSI chip speed */
+ esp->cfreq = 25000000;
+
+ esp->dregs = 0;
+
+ /* ESP register base */
+ esp->eregs = (struct ESP_regs *) (system_base + IOASIC_SCSI);
+
+ /* Set the command buffer */
+ esp->esp_command = (volatile unsigned char *) cmd_buffer;
+
+ /* get virtual dma address for command buffer */
+ esp->esp_command_dvma = virt_to_phys(cmd_buffer);
+
+ esp->irq = dec_interrupt[DEC_IRQ_ASC];
+
+ esp->scsi_id = 7;
+
+ /* Check for differential SCSI-bus */
+ esp->diff = 0;
+
+ esp_initialize(esp);
+
+ if (request_irq(esp->irq, esp_intr, SA_INTERRUPT,
+ "ncr53c94", esp->ehost))
+ goto err_dealloc;
+ if (request_irq(dec_interrupt[DEC_IRQ_ASC_MERR],
+ scsi_dma_merr_int, SA_INTERRUPT,
+ "ncr53c94 error", esp->ehost))
+ goto err_free_irq;
+ if (request_irq(dec_interrupt[DEC_IRQ_ASC_ERR],
+ scsi_dma_err_int, SA_INTERRUPT,
+ "ncr53c94 overrun", esp->ehost))
+ goto err_free_irq_merr;
+ if (request_irq(dec_interrupt[DEC_IRQ_ASC_DMA],
+ scsi_dma_int, SA_INTERRUPT,
+ "ncr53c94 dma", esp->ehost))
+ goto err_free_irq_err;
+
+ }
+
+ if (TURBOCHANNEL) {
+ while ((slot = search_tc_card("PMAZ-AA")) >= 0) {
+ claim_tc_card(slot);
+
+ esp_dev = 0;
+ esp = esp_allocate(tpnt, (void *) esp_dev);
+
+ mem_start = get_tc_base_addr(slot);
+
+ /* Store base addr into esp struct */
+ esp->slot = PHYSADDR(mem_start);
+
+ esp->dregs = 0;
+ esp->eregs = (struct ESP_regs *) (mem_start + DEC_SCSI_SREG);
+ esp->do_pio_cmds = 1;
+
+ /* Set the command buffer */
+ esp->esp_command = (volatile unsigned char *) pmaz_cmd_buffer;
+
+ /* get virtual dma address for command buffer */
+ esp->esp_command_dvma = virt_to_phys(pmaz_cmd_buffer);
+
+ esp->cfreq = get_tc_speed();
+
+ esp->irq = get_tc_irq_nr(slot);
+
+ /* Required functions */
+ esp->dma_bytes_sent = &dma_bytes_sent;
+ esp->dma_can_transfer = &dma_can_transfer;
+ esp->dma_dump_state = &dma_dump_state;
+ esp->dma_init_read = &pmaz_dma_init_read;
+ esp->dma_init_write = &pmaz_dma_init_write;
+ esp->dma_ints_off = &pmaz_dma_ints_off;
+ esp->dma_ints_on = &pmaz_dma_ints_on;
+ esp->dma_irq_p = &dma_irq_p;
+ esp->dma_ports_p = &dma_ports_p;
+ esp->dma_setup = &pmaz_dma_setup;
+
+ /* Optional functions */
+ esp->dma_barrier = 0;
+ esp->dma_drain = &pmaz_dma_drain;
+ esp->dma_invalidate = 0;
+ esp->dma_irq_entry = 0;
+ esp->dma_irq_exit = 0;
+ esp->dma_poll = 0;
+ esp->dma_reset = 0;
+ esp->dma_led_off = 0;
+ esp->dma_led_on = 0;
+
+ esp->dma_mmu_get_scsi_one = pmaz_dma_mmu_get_scsi_one;
+ esp->dma_mmu_get_scsi_sgl = 0;
+ esp->dma_mmu_release_scsi_one = 0;
+ esp->dma_mmu_release_scsi_sgl = 0;
+ esp->dma_advance_sg = 0;
+
+ if (request_irq(esp->irq, esp_intr, SA_INTERRUPT,
+ "PMAZ_AA", esp->ehost)) {
+ esp_deallocate(esp);
+ release_tc_card(slot);
+ continue;
+ }
+ esp->scsi_id = 7;
+ esp->diff = 0;
+ esp_initialize(esp);
+ }
+ }
+
+ if(nesps) {
+ printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps, esps_in_use);
+ esps_running = esps_in_use;
+ return esps_in_use;
+ }
+ return 0;
+
+err_free_irq_err:
+ free_irq(dec_interrupt[DEC_IRQ_ASC_ERR], scsi_dma_err_int);
+err_free_irq_merr:
+ free_irq(dec_interrupt[DEC_IRQ_ASC_MERR], scsi_dma_merr_int);
+err_free_irq:
+ free_irq(esp->irq, esp_intr);
+err_dealloc:
+ esp_deallocate(esp);
+ return 0;
+}
+
+/************************************************************* DMA Functions */
+static irqreturn_t scsi_dma_merr_int(int irq, void *dev_id, struct pt_regs *regs)
+{
+ printk("Got unexpected SCSI DMA Interrupt! < ");
+ printk("SCSI_DMA_MEMRDERR ");
+ printk(">\n");
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t scsi_dma_err_int(int irq, void *dev_id, struct pt_regs *regs)
+{
+ /* empty */
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t scsi_dma_int(int irq, void *dev_id, struct pt_regs *regs)
+{
+ u32 scsi_next_ptr;
+
+ scsi_next_ptr = ioasic_read(IO_REG_SCSI_DMA_P);
+
+ /* next page */
+ scsi_next_ptr = (((scsi_next_ptr >> 3) + PAGE_SIZE) & PAGE_MASK) << 3;
+ ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
+ fast_iob();
+
+ return IRQ_HANDLED;
+}
+
+static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
+{
+ return fifo_count;
+}
+
+static void dma_drain(struct NCR_ESP *esp)
+{
+ u32 nw, data0, data1, scsi_data_ptr;
+ u16 *p;
+
+ nw = ioasic_read(IO_REG_SCSI_SCR);
+
+ /*
+ * Is there something in the dma buffers left?
+ */
+ if (nw) {
+ scsi_data_ptr = ioasic_read(IO_REG_SCSI_DMA_P) >> 3;
+ p = phys_to_virt(scsi_data_ptr);
+ switch (nw) {
+ case 1:
+ data0 = ioasic_read(IO_REG_SCSI_SDR0);
+ p[0] = data0 & 0xffff;
+ break;
+ case 2:
+ data0 = ioasic_read(IO_REG_SCSI_SDR0);
+ p[0] = data0 & 0xffff;
+ p[1] = (data0 >> 16) & 0xffff;
+ break;
+ case 3:
+ data0 = ioasic_read(IO_REG_SCSI_SDR0);
+ data1 = ioasic_read(IO_REG_SCSI_SDR1);
+ p[0] = data0 & 0xffff;
+ p[1] = (data0 >> 16) & 0xffff;
+ p[2] = data1 & 0xffff;
+ break;
+ default:
+ printk("Strange: %d words in dma buffer left\n", nw);
+ break;
+ }
+ }
+}
+
+static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd * sp)
+{
+ return sp->SCp.this_residual;
+}
+
+static void dma_dump_state(struct NCR_ESP *esp)
+{
+}
+
+static void dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length)
+{
+ u32 scsi_next_ptr, ioasic_ssr;
+ unsigned long flags;
+
+ if (vaddress & 3)
+ panic("dec_esp.c: unable to handle partial word transfers, yet...");
+
+ dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
+
+ spin_lock_irqsave(&ioasic_ssr_lock, flags);
+
+ fast_mb();
+ ioasic_ssr = ioasic_read(IO_REG_SSR);
+
+ ioasic_ssr &= ~IO_SSR_SCSI_DMA_EN;
+ ioasic_write(IO_REG_SSR, ioasic_ssr);
+
+ fast_wmb();
+ ioasic_write(IO_REG_SCSI_SCR, 0);
+ ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3);
+
+ /* prepare for next page */
+ scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
+ ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
+
+ ioasic_ssr |= (IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN);
+ fast_wmb();
+ ioasic_write(IO_REG_SSR, ioasic_ssr);
+
+ fast_iob();
+ spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
+}
+
+static void dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length)
+{
+ u32 scsi_next_ptr, ioasic_ssr;
+ unsigned long flags;
+
+ if (vaddress & 3)
+ panic("dec_esp.c: unable to handle partial word transfers, yet...");
+
+ dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
+
+ spin_lock_irqsave(&ioasic_ssr_lock, flags);
+
+ fast_mb();
+ ioasic_ssr = ioasic_read(IO_REG_SSR);
+
+ ioasic_ssr &= ~(IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN);
+ ioasic_write(IO_REG_SSR, ioasic_ssr);
+
+ fast_wmb();
+ ioasic_write(IO_REG_SCSI_SCR, 0);
+ ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3);
+
+ /* prepare for next page */
+ scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
+ ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
+
+ ioasic_ssr |= IO_SSR_SCSI_DMA_EN;
+ fast_wmb();
+ ioasic_write(IO_REG_SSR, ioasic_ssr);
+
+ fast_iob();
+ spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
+}
+
+static void dma_ints_off(struct NCR_ESP *esp)
+{
+ disable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]);
+}
+
+static void dma_ints_on(struct NCR_ESP *esp)
+{
+ enable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]);
+}
+
+static int dma_irq_p(struct NCR_ESP *esp)
+{
+ return (esp->eregs->esp_status & ESP_STAT_INTR);
+}
+
+static int dma_ports_p(struct NCR_ESP *esp)
+{
+ /*
+ * FIXME: what's this good for?
+ */
+ return 1;
+}
+
+static void dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write)
+{
+ /*
+ * DMA_ST_WRITE means "move data from device to memory"
+ * so when (write) is true, it actually means READ!
+ */
+ if (write)
+ dma_init_read(esp, addr, count);
+ else
+ dma_init_write(esp, addr, count);
+}
+
+static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp)
+{
+ sp->SCp.ptr = (char *)virt_to_phys(sp->request_buffer);
+}
+
+static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, struct scsi_cmnd * sp)
+{
+ int sz = sp->SCp.buffers_residual;
+ struct scatterlist *sg = sp->SCp.buffer;
+
+ while (sz >= 0) {
+ sg[sz].dma_address = page_to_phys(sg[sz].page) + sg[sz].offset;
+ sz--;
+ }
+ sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
+}
+
+static void dma_advance_sg(struct scsi_cmnd * sp)
+{
+ sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
+}
+
+static void pmaz_dma_drain(struct NCR_ESP *esp)
+{
+ memcpy(phys_to_virt(esp_virt_buffer),
+ (void *)KSEG1ADDR(esp->slot + DEC_SCSI_SRAM + ESP_TGT_DMA_SIZE),
+ scsi_current_length);
+}
+
+static void pmaz_dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length)
+{
+ volatile u32 *dmareg =
+ (volatile u32 *)KSEG1ADDR(esp->slot + DEC_SCSI_DMAREG);
+
+ if (length > ESP_TGT_DMA_SIZE)
+ length = ESP_TGT_DMA_SIZE;
+
+ *dmareg = TC_ESP_DMA_ADDR(ESP_TGT_DMA_SIZE);
+
+ iob();
+
+ esp_virt_buffer = vaddress;
+ scsi_current_length = length;
+}
+
+static void pmaz_dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length)
+{
+ volatile u32 *dmareg =
+ (volatile u32 *)KSEG1ADDR(esp->slot + DEC_SCSI_DMAREG);
+
+ memcpy((void *)KSEG1ADDR(esp->slot + DEC_SCSI_SRAM + ESP_TGT_DMA_SIZE),
+ phys_to_virt(vaddress), length);
+
+ wmb();
+ *dmareg = TC_ESP_DMAR_WRITE | TC_ESP_DMA_ADDR(ESP_TGT_DMA_SIZE);
+
+ iob();
+}
+
+static void pmaz_dma_ints_off(struct NCR_ESP *esp)
+{
+}
+
+static void pmaz_dma_ints_on(struct NCR_ESP *esp)
+{
+}
+
+static void pmaz_dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write)
+{
+ /*
+ * DMA_ST_WRITE means "move data from device to memory"
+ * so when (write) is true, it actually means READ!
+ */
+ if (write)
+ pmaz_dma_init_read(esp, addr, count);
+ else
+ pmaz_dma_init_write(esp, addr, count);
+}
+
+static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp)
+{
+ sp->SCp.ptr = (char *)virt_to_phys(sp->request_buffer);
+}
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