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#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>
#define DMA(ptr) ((a2091_scsiregs *)((ptr)->base))
static int a2091_release(struct Scsi_Host *instance);
static irqreturn_t a2091_intr(int irq, void *_instance)
{
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(struct scsi_cmnd *cmd, int dir_in)
{
struct Scsi_Host *instance = cmd->device->host;
struct WD33C93_hostdata *hdata = shost_priv(instance);
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;
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, struct scsi_cmnd *SCpnt,
int status)
{
struct WD33C93_hostdata *hdata = shost_priv(instance);
/* disable SCSI interrupts */
unsigned short cntr = CNTR_PDMD;
if (!hdata->dma_dir)
cntr |= CNTR_DDIR;
/* disable SCSI interrupts */
DMA(instance)->CNTR = cntr;
/* flush if we were reading */
if (hdata->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->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 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;
DMA(instance)->DAWR = DAWR_A2091;
regs.SASR = &(DMA(instance)->SASR);
regs.SCMD = &(DMA(instance)->SCMD);
hdata = shost_priv(instance);
hdata->no_sync = 0xff;
hdata->fast = 0;
hdata->dma_mode = CTRL_DMA;
wd33c93_init(instance, regs, dma_setup, dma_stop,
WD33C93_FS_8_10);
if (request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
"A2091 SCSI", instance))
goto unregister;
DMA(instance)->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
DMA(instance)->CNTR = 0;
release_mem_region(ZTWO_PADDR(instance->base), 256);
free_irq(IRQ_AMIGA_PORTS, instance);
#endif
return 1;
}
MODULE_LICENSE("GPL");
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