256 строки
6.1 KiB
C
256 строки
6.1 KiB
C
#include <linux/types.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/blkdev.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>
|
|
|
|
|
|
static int a2091_release(struct Scsi_Host *instance);
|
|
|
|
static irqreturn_t a2091_intr(int irq, void *data)
|
|
{
|
|
struct Scsi_Host *instance = data;
|
|
a2091_scsiregs *regs = (a2091_scsiregs *)(instance->base);
|
|
unsigned int status = regs->ISTR;
|
|
unsigned long flags;
|
|
|
|
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(struct scsi_cmnd *cmd, int dir_in)
|
|
{
|
|
struct Scsi_Host *instance = cmd->device->host;
|
|
struct WD33C93_hostdata *hdata = shost_priv(instance);
|
|
a2091_scsiregs *regs = (a2091_scsiregs *)(instance->base);
|
|
unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
|
|
unsigned long addr = virt_to_bus(cmd->SCp.ptr);
|
|
|
|
/* don't allow DMA if the physical address is bad */
|
|
if (addr & A2091_XFER_MASK) {
|
|
hdata->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
|
|
hdata->dma_bounce_buffer = kmalloc(hdata->dma_bounce_len,
|
|
GFP_KERNEL);
|
|
|
|
/* can't allocate memory; use PIO */
|
|
if (!hdata->dma_bounce_buffer) {
|
|
hdata->dma_bounce_len = 0;
|
|
return 1;
|
|
}
|
|
|
|
/* get the physical address of the bounce buffer */
|
|
addr = virt_to_bus(hdata->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->dma_bounce_buffer);
|
|
hdata->dma_bounce_buffer = NULL;
|
|
hdata->dma_bounce_len = 0;
|
|
return 1;
|
|
}
|
|
|
|
if (!dir_in) {
|
|
/* copy to bounce buffer for a write */
|
|
memcpy(hdata->dma_bounce_buffer, cmd->SCp.ptr,
|
|
cmd->SCp.this_residual);
|
|
}
|
|
}
|
|
|
|
/* setup dma direction */
|
|
if (!dir_in)
|
|
cntr |= CNTR_DDIR;
|
|
|
|
/* remember direction */
|
|
hdata->dma_dir = dir_in;
|
|
|
|
regs->CNTR = cntr;
|
|
|
|
/* setup DMA *physical* address */
|
|
regs->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 */
|
|
regs->ST_DMA = 1;
|
|
|
|
/* return success */
|
|
return 0;
|
|
}
|
|
|
|
static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
|
|
int status)
|
|
{
|
|
struct WD33C93_hostdata *hdata = shost_priv(instance);
|
|
a2091_scsiregs *regs = (a2091_scsiregs *)(instance->base);
|
|
|
|
/* disable SCSI interrupts */
|
|
unsigned short cntr = CNTR_PDMD;
|
|
|
|
if (!hdata->dma_dir)
|
|
cntr |= CNTR_DDIR;
|
|
|
|
/* disable SCSI interrupts */
|
|
regs->CNTR = cntr;
|
|
|
|
/* flush if we were reading */
|
|
if (hdata->dma_dir) {
|
|
regs->FLUSH = 1;
|
|
while (!(regs->ISTR & ISTR_FE_FLG))
|
|
;
|
|
}
|
|
|
|
/* clear a possible interrupt */
|
|
regs->CINT = 1;
|
|
|
|
/* stop DMA */
|
|
regs->SP_DMA = 1;
|
|
|
|
/* restore the CONTROL bits (minus the direction flag) */
|
|
regs->CNTR = CNTR_PDMD | CNTR_INTEN;
|
|
|
|
/* copy from a bounce buffer, if necessary */
|
|
if (status && hdata->dma_bounce_buffer) {
|
|
if (hdata->dma_dir)
|
|
memcpy(SCpnt->SCp.ptr, hdata->dma_bounce_buffer,
|
|
SCpnt->SCp.this_residual);
|
|
kfree(hdata->dma_bounce_buffer);
|
|
hdata->dma_bounce_buffer = NULL;
|
|
hdata->dma_bounce_len = 0;
|
|
}
|
|
}
|
|
|
|
static int __init a2091_detect(struct scsi_host_template *tpnt)
|
|
{
|
|
static unsigned char called = 0;
|
|
struct Scsi_Host *instance;
|
|
unsigned long address;
|
|
struct zorro_dev *z = NULL;
|
|
wd33c93_regs wdregs;
|
|
a2091_scsiregs *regs;
|
|
struct WD33C93_hostdata *hdata;
|
|
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)
|
|
goto release;
|
|
instance->base = ZTWO_VADDR(address);
|
|
instance->irq = IRQ_AMIGA_PORTS;
|
|
instance->unique_id = z->slotaddr;
|
|
regs = (a2091_scsiregs *)(instance->base);
|
|
regs->DAWR = DAWR_A2091;
|
|
wdregs.SASR = ®s->SASR;
|
|
wdregs.SCMD = ®s->SCMD;
|
|
hdata = shost_priv(instance);
|
|
hdata->no_sync = 0xff;
|
|
hdata->fast = 0;
|
|
hdata->dma_mode = CTRL_DMA;
|
|
wd33c93_init(instance, wdregs, dma_setup, dma_stop,
|
|
WD33C93_FS_8_10);
|
|
if (request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
|
|
"A2091 SCSI", instance))
|
|
goto unregister;
|
|
regs->CNTR = CNTR_PDMD | CNTR_INTEN;
|
|
num_a2091++;
|
|
continue;
|
|
|
|
unregister:
|
|
scsi_unregister(instance);
|
|
release:
|
|
release_mem_region(address, 256);
|
|
}
|
|
|
|
return num_a2091;
|
|
}
|
|
|
|
static int a2091_bus_reset(struct scsi_cmnd *cmd)
|
|
{
|
|
/* FIXME perform bus-specific reset */
|
|
|
|
/* FIXME 2: kill this function, and let midlayer fall back
|
|
to the same action, calling wd33c93_host_reset() */
|
|
|
|
spin_lock_irq(cmd->device->host->host_lock);
|
|
wd33c93_host_reset(cmd);
|
|
spin_unlock_irq(cmd->device->host->host_lock);
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
#define HOSTS_C
|
|
|
|
static struct 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"
|
|
|
|
static int a2091_release(struct Scsi_Host *instance)
|
|
{
|
|
#ifdef MODULE
|
|
a2091_scsiregs *regs = (a2091_scsiregs *)(instance->base);
|
|
|
|
regs->CNTR = 0;
|
|
release_mem_region(ZTWO_PADDR(instance->base), 256);
|
|
free_irq(IRQ_AMIGA_PORTS, instance);
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|