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path: root/drivers/scsi/a3000.c
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Diffstat (limited to 'drivers/scsi/a3000.c')
-rw-r--r--drivers/scsi/a3000.c245
1 files changed, 245 insertions, 0 deletions
diff --git a/drivers/scsi/a3000.c b/drivers/scsi/a3000.c
new file mode 100644
index 00000000000..f8a89ec2504
--- /dev/null
+++ b/drivers/scsi/a3000.c
@@ -0,0 +1,245 @@
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/blkdev.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/spinlock.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 <asm/irq.h>
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "wd33c93.h"
+#include "a3000.h"
+
+#include<linux/stat.h>
+
+#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
+#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
+
+static struct Scsi_Host *a3000_host = NULL;
+
+static irqreturn_t a3000_intr (int irq, void *dummy, struct pt_regs *fp)
+{
+ unsigned long flags;
+ unsigned int status = DMA(a3000_host)->ISTR;
+
+ if (!(status & ISTR_INT_P))
+ return IRQ_NONE;
+ if (status & ISTR_INTS)
+ {
+ spin_lock_irqsave(a3000_host->host_lock, flags);
+ wd33c93_intr (a3000_host);
+ spin_unlock_irqrestore(a3000_host->host_lock, flags);
+ return IRQ_HANDLED;
+ }
+ printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
+ return IRQ_NONE;
+}
+
+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);
+
+ /*
+ * if the physical address has the wrong alignment, or if
+ * physical address is bad, or if it is a write and at the
+ * end of a physical memory chunk, then allocate a bounce
+ * buffer
+ */
+ if (addr & A3000_XFER_MASK ||
+ (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
+ {
+ HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
+ & ~0x1ff;
+ HDATA(a3000_host)->dma_bounce_buffer =
+ kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
+
+ /* can't allocate memory; use PIO */
+ if (!HDATA(a3000_host)->dma_bounce_buffer) {
+ HDATA(a3000_host)->dma_bounce_len = 0;
+ return 1;
+ }
+
+ if (!dir_in) {
+ /* copy to bounce buffer for a write */
+ if (cmd->use_sg) {
+ memcpy (HDATA(a3000_host)->dma_bounce_buffer,
+ cmd->SCp.ptr, cmd->SCp.this_residual);
+ } else
+ memcpy (HDATA(a3000_host)->dma_bounce_buffer,
+ cmd->request_buffer, cmd->request_bufflen);
+ }
+
+ addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
+ }
+
+ /* setup dma direction */
+ if (!dir_in)
+ cntr |= CNTR_DDIR;
+
+ /* remember direction */
+ HDATA(a3000_host)->dma_dir = dir_in;
+
+ DMA(a3000_host)->CNTR = cntr;
+
+ /* setup DMA *physical* address */
+ DMA(a3000_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 */
+ mb(); /* make sure setup is completed */
+ DMA(a3000_host)->ST_DMA = 1;
+ mb(); /* make sure DMA has started before next IO */
+
+ /* 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;
+
+ DMA(instance)->CNTR = cntr;
+ mb(); /* make sure CNTR is updated before next IO */
+
+ /* flush if we were reading */
+ if (HDATA(instance)->dma_dir) {
+ DMA(instance)->FLUSH = 1;
+ mb(); /* don't allow prefetch */
+ while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
+ barrier();
+ mb(); /* no IO until FLUSH is done */
+ }
+
+ /* clear a possible interrupt */
+ /* I think that this CINT is only necessary if you are
+ * using the terminal count features. HM 7 Mar 1994
+ */
+ DMA(instance)->CINT = 1;
+
+ /* stop DMA */
+ DMA(instance)->SP_DMA = 1;
+ mb(); /* make sure DMA is stopped before next IO */
+
+ /* restore the CONTROL bits (minus the direction flag) */
+ DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
+ mb(); /* make sure CNTR is updated before next IO */
+
+ /* copy from a bounce buffer, if necessary */
+ if (status && HDATA(instance)->dma_bounce_buffer) {
+ if (SCpnt && SCpnt->use_sg) {
+ if (HDATA(instance)->dma_dir && SCpnt)
+ 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;
+ } 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 a3000_detect(Scsi_Host_Template *tpnt)
+{
+ wd33c93_regs regs;
+
+ if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
+ return 0;
+ if (!request_mem_region(0xDD0000, 256, "wd33c93"))
+ return 0;
+
+ tpnt->proc_name = "A3000";
+ tpnt->proc_info = &wd33c93_proc_info;
+
+ a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
+ if (a3000_host == NULL)
+ goto fail_register;
+
+ a3000_host->base = ZTWO_VADDR(0xDD0000);
+ a3000_host->irq = IRQ_AMIGA_PORTS;
+ DMA(a3000_host)->DAWR = DAWR_A3000;
+ regs.SASR = &(DMA(a3000_host)->SASR);
+ regs.SCMD = &(DMA(a3000_host)->SCMD);
+ wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
+ if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, SA_SHIRQ, "A3000 SCSI",
+ a3000_intr))
+ goto fail_irq;
+ DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;
+
+ return 1;
+
+fail_irq:
+ wd33c93_release();
+ scsi_unregister(a3000_host);
+fail_register:
+ release_mem_region(0xDD0000, 256);
+ return 0;
+}
+
+static int a3000_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 = "A3000",
+ .name = "Amiga 3000 built-in SCSI",
+ .detect = a3000_detect,
+ .release = a3000_release,
+ .queuecommand = wd33c93_queuecommand,
+ .eh_abort_handler = wd33c93_abort,
+ .eh_bus_reset_handler = a3000_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 = ENABLE_CLUSTERING
+};
+
+
+#include "scsi_module.c"
+
+int a3000_release(struct Scsi_Host *instance)
+{
+ wd33c93_release();
+ DMA(instance)->CNTR = 0;
+ release_mem_region(0xDD0000, 256);
+ free_irq(IRQ_AMIGA_PORTS, a3000_intr);
+ return 1;
+}
+
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-11 14:57:31 +0000