diff options
Diffstat (limited to 'drivers/scsi/a3000.c')
| -rw-r--r-- | drivers/scsi/a3000.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/drivers/scsi/a3000.c b/drivers/scsi/a3000.c new file mode 100644 index 000000000000..f8a89ec25042 --- /dev/null +++ b/drivers/scsi/a3000.c @@ -0,0 +1,245 @@ +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/blkdev.h> +#include <linux/sched.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> + +#include <asm/setup.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/amigaints.h> +#include <asm/amigahw.h> +#include <asm/irq.h> + +#include "scsi.h" +#include <scsi/scsi_host.h> +#include "wd33c93.h" +#include "a3000.h" + +#include<linux/stat.h> + +#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base)) +#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata)) + +static struct Scsi_Host *a3000_host = NULL; + +static irqreturn_t a3000_intr (int irq, void *dummy, struct pt_regs *fp) +{ + unsigned long flags; + unsigned int status = DMA(a3000_host)->ISTR; + + if (!(status & ISTR_INT_P)) + return IRQ_NONE; + if (status & ISTR_INTS) + { + spin_lock_irqsave(a3000_host->host_lock, flags); + wd33c93_intr (a3000_host); + spin_unlock_irqrestore(a3000_host->host_lock, flags); + return IRQ_HANDLED; + } + printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status); + return IRQ_NONE; +} + +static int dma_setup (Scsi_Cmnd *cmd, int dir_in) +{ + unsigned short cntr = CNTR_PDMD | CNTR_INTEN; + unsigned long addr = virt_to_bus(cmd->SCp.ptr); + + /* + * if the physical address has the wrong alignment, or if + * physical address is bad, or if it is a write and at the + * end of a physical memory chunk, then allocate a bounce + * buffer + */ + if (addr & A3000_XFER_MASK || + (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual))) + { + HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511) + & ~0x1ff; + HDATA(a3000_host)->dma_bounce_buffer = + kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL); + + /* can't allocate memory; use PIO */ + if (!HDATA(a3000_host)->dma_bounce_buffer) { + HDATA(a3000_host)->dma_bounce_len = 0; + return 1; + } + + if (!dir_in) { + /* copy to bounce buffer for a write */ + if (cmd->use_sg) { + memcpy (HDATA(a3000_host)->dma_bounce_buffer, + cmd->SCp.ptr, cmd->SCp.this_residual); + } else + memcpy (HDATA(a3000_host)->dma_bounce_buffer, + cmd->request_buffer, cmd->request_bufflen); + } + + addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer); + } + + /* setup dma direction */ + if (!dir_in) + cntr |= CNTR_DDIR; + + /* remember direction */ + HDATA(a3000_host)->dma_dir = dir_in; + + DMA(a3000_host)->CNTR = cntr; + + /* setup DMA *physical* address */ + DMA(a3000_host)->ACR = addr; + + if (dir_in) + /* invalidate any cache */ + cache_clear (addr, cmd->SCp.this_residual); + else + /* push any dirty cache */ + cache_push (addr, cmd->SCp.this_residual); + + /* start DMA */ + mb(); /* make sure setup is completed */ + DMA(a3000_host)->ST_DMA = 1; + mb(); /* make sure DMA has started before next IO */ + + /* return success */ + return 0; +} + +static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt, + int status) +{ + /* disable SCSI interrupts */ + unsigned short cntr = CNTR_PDMD; + + if (!HDATA(instance)->dma_dir) + cntr |= CNTR_DDIR; + + DMA(instance)->CNTR = cntr; + mb(); /* make sure CNTR is updated before next IO */ + + /* flush if we were reading */ + if (HDATA(instance)->dma_dir) { + DMA(instance)->FLUSH = 1; + mb(); /* don't allow prefetch */ + while (!(DMA(instance)->ISTR & ISTR_FE_FLG)) + barrier(); + mb(); /* no IO until FLUSH is done */ + } + + /* clear a possible interrupt */ + /* I think that this CINT is only necessary if you are + * using the terminal count features. HM 7 Mar 1994 + */ + DMA(instance)->CINT = 1; + + /* stop DMA */ + DMA(instance)->SP_DMA = 1; + mb(); /* make sure DMA is stopped before next IO */ + + /* restore the CONTROL bits (minus the direction flag) */ + DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; + mb(); /* make sure CNTR is updated before next IO */ + + /* copy from a bounce buffer, if necessary */ + if (status && HDATA(instance)->dma_bounce_buffer) { + if (SCpnt && SCpnt->use_sg) { + if (HDATA(instance)->dma_dir && SCpnt) + memcpy (SCpnt->SCp.ptr, + HDATA(instance)->dma_bounce_buffer, + SCpnt->SCp.this_residual); + kfree (HDATA(instance)->dma_bounce_buffer); + HDATA(instance)->dma_bounce_buffer = NULL; + HDATA(instance)->dma_bounce_len = 0; + } else { + if (HDATA(instance)->dma_dir && SCpnt) + memcpy (SCpnt->request_buffer, + HDATA(instance)->dma_bounce_buffer, + SCpnt->request_bufflen); + + kfree (HDATA(instance)->dma_bounce_buffer); + HDATA(instance)->dma_bounce_buffer = NULL; + HDATA(instance)->dma_bounce_len = 0; + } + } +} + +int __init a3000_detect(Scsi_Host_Template *tpnt) +{ + wd33c93_regs regs; + + if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI)) + return 0; + if (!request_mem_region(0xDD0000, 256, "wd33c93")) + return 0; + + tpnt->proc_name = "A3000"; + tpnt->proc_info = &wd33c93_proc_info; + + a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata)); + if (a3000_host == NULL) + goto fail_register; + + a3000_host->base = ZTWO_VADDR(0xDD0000); + a3000_host->irq = IRQ_AMIGA_PORTS; + DMA(a3000_host)->DAWR = DAWR_A3000; + regs.SASR = &(DMA(a3000_host)->SASR); + regs.SCMD = &(DMA(a3000_host)->SCMD); + wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15); + if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, SA_SHIRQ, "A3000 SCSI", + a3000_intr)) + goto fail_irq; + DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN; + + return 1; + +fail_irq: + wd33c93_release(); + scsi_unregister(a3000_host); +fail_register: + release_mem_region(0xDD0000, 256); + return 0; +} + +static int a3000_bus_reset(Scsi_Cmnd *cmd) +{ + /* FIXME perform bus-specific reset */ + wd33c93_host_reset(cmd); + return SUCCESS; +} + +#define HOSTS_C + +static Scsi_Host_Template driver_template = { + .proc_name = "A3000", + .name = "Amiga 3000 built-in SCSI", + .detect = a3000_detect, + .release = a3000_release, + .queuecommand = wd33c93_queuecommand, + .eh_abort_handler = wd33c93_abort, + .eh_bus_reset_handler = a3000_bus_reset, + .eh_host_reset_handler = wd33c93_host_reset, + .can_queue = CAN_QUEUE, + .this_id = 7, + .sg_tablesize = SG_ALL, + .cmd_per_lun = CMD_PER_LUN, + .use_clustering = ENABLE_CLUSTERING +}; + + +#include "scsi_module.c" + +int a3000_release(struct Scsi_Host *instance) +{ + wd33c93_release(); + DMA(instance)->CNTR = 0; + release_mem_region(0xDD0000, 256); + free_irq(IRQ_AMIGA_PORTS, a3000_intr); + return 1; +} + +MODULE_LICENSE("GPL"); |
