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path: root/drivers/scsi/a2091.c
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Diffstat (limited to 'drivers/scsi/a2091.c')
-rw-r--r--drivers/scsi/a2091.c260
1 files changed, 260 insertions, 0 deletions
diff --git a/drivers/scsi/a2091.c b/drivers/scsi/a2091.c
new file mode 100644
index 00000000000..9928a2fbce0
--- /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");
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-11 14:47:09 +0000