diff options
Diffstat (limited to 'drivers/scsi/a2091.c')
| -rw-r--r-- | drivers/scsi/a2091.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/drivers/scsi/a2091.c b/drivers/scsi/a2091.c new file mode 100644 index 000000000000..9928a2fbce0c --- /dev/null +++ b/drivers/scsi/a2091.c @@ -0,0 +1,260 @@ +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/blkdev.h> +#include <linux/sched.h> +#include <linux/version.h> +#include <linux/init.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 <linux/zorro.h> +#include <asm/irq.h> +#include <linux/spinlock.h> + +#include "scsi.h" +#include <scsi/scsi_host.h> +#include "wd33c93.h" +#include "a2091.h" + +#include<linux/stat.h> + +#define DMA(ptr) ((a2091_scsiregs *)((ptr)->base)) +#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata)) + +static irqreturn_t a2091_intr (int irq, void *_instance, struct pt_regs *fp) +{ + unsigned long flags; + unsigned int status; + struct Scsi_Host *instance = (struct Scsi_Host *)_instance; + + status = DMA(instance)->ISTR; + if (!(status & (ISTR_INT_F|ISTR_INT_P)) || !(status & ISTR_INTS)) + return IRQ_NONE; + + spin_lock_irqsave(instance->host_lock, flags); + wd33c93_intr(instance); + spin_unlock_irqrestore(instance->host_lock, flags); + return IRQ_HANDLED; +} + +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); + struct Scsi_Host *instance = cmd->device->host; + + /* don't allow DMA if the physical address is bad */ + if (addr & A2091_XFER_MASK || + (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual))) + { + HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511) + & ~0x1ff; + HDATA(instance)->dma_bounce_buffer = + kmalloc (HDATA(instance)->dma_bounce_len, GFP_KERNEL); + + /* can't allocate memory; use PIO */ + if (!HDATA(instance)->dma_bounce_buffer) { + HDATA(instance)->dma_bounce_len = 0; + return 1; + } + + /* get the physical address of the bounce buffer */ + addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer); + + /* the bounce buffer may not be in the first 16M of physmem */ + if (addr & A2091_XFER_MASK) { + /* we could use chipmem... maybe later */ + kfree (HDATA(instance)->dma_bounce_buffer); + HDATA(instance)->dma_bounce_buffer = NULL; + HDATA(instance)->dma_bounce_len = 0; + return 1; + } + + if (!dir_in) { + /* copy to bounce buffer for a write */ + if (cmd->use_sg) +#if 0 + panic ("scsi%ddma: incomplete s/g support", + instance->host_no); +#else + memcpy (HDATA(instance)->dma_bounce_buffer, + cmd->SCp.ptr, cmd->SCp.this_residual); +#endif + else + memcpy (HDATA(instance)->dma_bounce_buffer, + cmd->request_buffer, cmd->request_bufflen); + } + } + + /* setup dma direction */ + if (!dir_in) + cntr |= CNTR_DDIR; + + /* remember direction */ + HDATA(cmd->device->host)->dma_dir = dir_in; + + DMA(cmd->device->host)->CNTR = cntr; + + /* setup DMA *physical* address */ + DMA(cmd->device->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 */ + DMA(cmd->device->host)->ST_DMA = 1; + + /* 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; + + /* disable SCSI interrupts */ + DMA(instance)->CNTR = cntr; + + /* flush if we were reading */ + if (HDATA(instance)->dma_dir) { + DMA(instance)->FLUSH = 1; + while (!(DMA(instance)->ISTR & ISTR_FE_FLG)) + ; + } + + /* clear a possible interrupt */ + DMA(instance)->CINT = 1; + + /* stop DMA */ + DMA(instance)->SP_DMA = 1; + + /* restore the CONTROL bits (minus the direction flag) */ + DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; + + /* copy from a bounce buffer, if necessary */ + if (status && HDATA(instance)->dma_bounce_buffer) { + if (SCpnt && SCpnt->use_sg) { +#if 0 + panic ("scsi%d: incomplete s/g support", + instance->host_no); +#else + if( HDATA(instance)->dma_dir ) + 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; + +#endif + } 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 a2091_detect(Scsi_Host_Template *tpnt) +{ + static unsigned char called = 0; + struct Scsi_Host *instance; + unsigned long address; + struct zorro_dev *z = NULL; + wd33c93_regs regs; + int num_a2091 = 0; + + if (!MACH_IS_AMIGA || called) + return 0; + called = 1; + + tpnt->proc_name = "A2091"; + tpnt->proc_info = &wd33c93_proc_info; + + while ((z = zorro_find_device(ZORRO_WILDCARD, z))) { + if (z->id != ZORRO_PROD_CBM_A590_A2091_1 && + z->id != ZORRO_PROD_CBM_A590_A2091_2) + continue; + address = z->resource.start; + if (!request_mem_region(address, 256, "wd33c93")) + continue; + + instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata)); + if (instance == NULL) { + release_mem_region(address, 256); + continue; + } + instance->base = ZTWO_VADDR(address); + instance->irq = IRQ_AMIGA_PORTS; + instance->unique_id = z->slotaddr; + DMA(instance)->DAWR = DAWR_A2091; + regs.SASR = &(DMA(instance)->SASR); + regs.SCMD = &(DMA(instance)->SCMD); + wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10); + request_irq(IRQ_AMIGA_PORTS, a2091_intr, SA_SHIRQ, "A2091 SCSI", + instance); + DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN; + num_a2091++; + } + + return num_a2091; +} + +static int a2091_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 = "A2901", + .name = "Commodore A2091/A590 SCSI", + .detect = a2091_detect, + .release = a2091_release, + .queuecommand = wd33c93_queuecommand, + .eh_abort_handler = wd33c93_abort, + .eh_bus_reset_handler = a2091_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 = DISABLE_CLUSTERING +}; + + +#include "scsi_module.c" + +int a2091_release(struct Scsi_Host *instance) +{ +#ifdef MODULE + DMA(instance)->CNTR = 0; + release_mem_region(ZTWO_PADDR(instance->base), 256); + free_irq(IRQ_AMIGA_PORTS, instance); + wd33c93_release(); +#endif + return 1; +} + +MODULE_LICENSE("GPL"); |