Viewing file:  a2091.c (6.3 KB) -rw-r--r--
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#include <linux/types.h>
#include <linux/mm.h>
#include <linux/blk.h>
#include <linux/sched.h>
#include <linux/version.h>
#include <linux/init.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 "hosts.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 struct Scsi_Host *first_instance = NULL;
static Scsi_Host_Template *a2091_template;
static void a2091_intr (int irq, void *dummy, struct pt_regs *fp)
{
unsigned long flags;
unsigned int status;
struct Scsi_Host *instance;
for (instance = first_instance; instance &&
instance->hostt == a2091_template; instance = instance->next)
{
status = DMA(instance)->ISTR;
if (!(status & (ISTR_INT_F|ISTR_INT_P)))
continue;
if (status & ISTR_INTS) {
spin_lock_irqsave(&io_request_lock, flags);
wd33c93_intr (instance);
spin_unlock_irqrestore(&io_request_lock, flags);
}
}
}
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->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 =
scsi_malloc (HDATA(instance)->dma_bounce_len);
/* 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 */
scsi_free (HDATA(instance)->dma_bounce_buffer,
HDATA(instance)->dma_bounce_len);
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->host)->dma_dir = dir_in;
DMA(cmd->host)->CNTR = cntr;
/* setup DMA *physical* address */
DMA(cmd->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->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);
scsi_free (HDATA(instance)->dma_bounce_buffer,
HDATA(instance)->dma_bounce_len);
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);
scsi_free (HDATA(instance)->dma_bounce_buffer,
HDATA(instance)->dma_bounce_len);
HDATA(instance)->dma_bounce_buffer = NULL;
HDATA(instance)->dma_bounce_len = 0;
}
}
}
static int num_a2091 = 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;
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);
if (num_a2091++ == 0) {
first_instance = instance;
a2091_template = instance->hostt;
request_irq(IRQ_AMIGA_PORTS, a2091_intr, SA_SHIRQ, "A2091 SCSI",
a2091_intr);
}
DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
}
return num_a2091;
}
#define HOSTS_C
static Scsi_Host_Template driver_template = A2091_SCSI;
#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);
if (--num_a2091 == 0)
free_irq(IRQ_AMIGA_PORTS, a2091_intr);
wd33c93_release();
#endif
return 1;
}
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