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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.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/scsi/a3000.c b/drivers/scsi/a3000.c
new file mode 100644
index 000000000..e6375b4de
--- /dev/null
+++ b/drivers/scsi/a3000.c
@@ -0,0 +1,286 @@
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/amigaints.h>
+#include <asm/amigahw.h>
+
+#include "scsi.h"
+#include "wd33c93.h"
+#include "a3000.h"
+
+
+struct a3000_hostdata {
+ struct WD33C93_hostdata wh;
+ struct a3000_scsiregs *regs;
+};
+
+static irqreturn_t a3000_intr(int irq, void *data)
+{
+ struct Scsi_Host *instance = data;
+ struct a3000_hostdata *hdata = shost_priv(instance);
+ unsigned int status = hdata->regs->ISTR;
+ unsigned long flags;
+
+ if (!(status & ISTR_INT_P))
+ return IRQ_NONE;
+ if (status & ISTR_INTS) {
+ spin_lock_irqsave(instance->host_lock, flags);
+ wd33c93_intr(instance);
+ spin_unlock_irqrestore(instance->host_lock, flags);
+ return IRQ_HANDLED;
+ }
+ pr_warning("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
+ return IRQ_NONE;
+}
+
+static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
+{
+ struct Scsi_Host *instance = cmd->device->host;
+ struct a3000_hostdata *hdata = shost_priv(instance);
+ struct WD33C93_hostdata *wh = &hdata->wh;
+ struct a3000_scsiregs *regs = hdata->regs;
+ 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) {
+ wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
+ wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
+ GFP_KERNEL);
+
+ /* can't allocate memory; use PIO */
+ if (!wh->dma_bounce_buffer) {
+ wh->dma_bounce_len = 0;
+ return 1;
+ }
+
+ if (!dir_in) {
+ /* copy to bounce buffer for a write */
+ memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
+ cmd->SCp.this_residual);
+ }
+
+ addr = virt_to_bus(wh->dma_bounce_buffer);
+ }
+
+ /* setup dma direction */
+ if (!dir_in)
+ cntr |= CNTR_DDIR;
+
+ /* remember direction */
+ wh->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 */
+ mb(); /* make sure setup is completed */
+ regs->ST_DMA = 1;
+ mb(); /* make sure DMA has started before next IO */
+
+ /* return success */
+ return 0;
+}
+
+static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
+ int status)
+{
+ struct a3000_hostdata *hdata = shost_priv(instance);
+ struct WD33C93_hostdata *wh = &hdata->wh;
+ struct a3000_scsiregs *regs = hdata->regs;
+
+ /* disable SCSI interrupts */
+ unsigned short cntr = CNTR_PDMD;
+
+ if (!wh->dma_dir)
+ cntr |= CNTR_DDIR;
+
+ regs->CNTR = cntr;
+ mb(); /* make sure CNTR is updated before next IO */
+
+ /* flush if we were reading */
+ if (wh->dma_dir) {
+ regs->FLUSH = 1;
+ mb(); /* don't allow prefetch */
+ while (!(regs->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
+ */
+ regs->CINT = 1;
+
+ /* stop DMA */
+ regs->SP_DMA = 1;
+ mb(); /* make sure DMA is stopped before next IO */
+
+ /* restore the CONTROL bits (minus the direction flag) */
+ regs->CNTR = CNTR_PDMD | CNTR_INTEN;
+ mb(); /* make sure CNTR is updated before next IO */
+
+ /* copy from a bounce buffer, if necessary */
+ if (status && wh->dma_bounce_buffer) {
+ if (SCpnt) {
+ if (wh->dma_dir && SCpnt)
+ memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
+ SCpnt->SCp.this_residual);
+ kfree(wh->dma_bounce_buffer);
+ wh->dma_bounce_buffer = NULL;
+ wh->dma_bounce_len = 0;
+ } else {
+ kfree(wh->dma_bounce_buffer);
+ wh->dma_bounce_buffer = NULL;
+ wh->dma_bounce_len = 0;
+ }
+ }
+}
+
+static int a3000_bus_reset(struct scsi_cmnd *cmd)
+{
+ struct Scsi_Host *instance = cmd->device->host;
+
+ /* FIXME perform bus-specific reset */
+
+ /* FIXME 2: kill this entire function, which should
+ cause mid-layer to call wd33c93_host_reset anyway? */
+
+ spin_lock_irq(instance->host_lock);
+ wd33c93_host_reset(cmd);
+ spin_unlock_irq(instance->host_lock);
+
+ return SUCCESS;
+}
+
+static struct scsi_host_template amiga_a3000_scsi_template = {
+ .module = THIS_MODULE,
+ .name = "Amiga 3000 built-in SCSI",
+ .show_info = wd33c93_show_info,
+ .write_info = wd33c93_write_info,
+ .proc_name = "A3000",
+ .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
+};
+
+static int __init amiga_a3000_scsi_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct Scsi_Host *instance;
+ int error;
+ struct a3000_scsiregs *regs;
+ wd33c93_regs wdregs;
+ struct a3000_hostdata *hdata;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ if (!request_mem_region(res->start, resource_size(res), "wd33c93"))
+ return -EBUSY;
+
+ instance = scsi_host_alloc(&amiga_a3000_scsi_template,
+ sizeof(struct a3000_hostdata));
+ if (!instance) {
+ error = -ENOMEM;
+ goto fail_alloc;
+ }
+
+ instance->irq = IRQ_AMIGA_PORTS;
+
+ regs = ZTWO_VADDR(res->start);
+ regs->DAWR = DAWR_A3000;
+
+ wdregs.SASR = &regs->SASR;
+ wdregs.SCMD = &regs->SCMD;
+
+ hdata = shost_priv(instance);
+ hdata->wh.no_sync = 0xff;
+ hdata->wh.fast = 0;
+ hdata->wh.dma_mode = CTRL_DMA;
+ hdata->regs = regs;
+
+ wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15);
+ error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED,
+ "A3000 SCSI", instance);
+ if (error)
+ goto fail_irq;
+
+ regs->CNTR = CNTR_PDMD | CNTR_INTEN;
+
+ error = scsi_add_host(instance, NULL);
+ if (error)
+ goto fail_host;
+
+ platform_set_drvdata(pdev, instance);
+
+ scsi_scan_host(instance);
+ return 0;
+
+fail_host:
+ free_irq(IRQ_AMIGA_PORTS, instance);
+fail_irq:
+ scsi_host_put(instance);
+fail_alloc:
+ release_mem_region(res->start, resource_size(res));
+ return error;
+}
+
+static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev)
+{
+ struct Scsi_Host *instance = platform_get_drvdata(pdev);
+ struct a3000_hostdata *hdata = shost_priv(instance);
+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ hdata->regs->CNTR = 0;
+ scsi_remove_host(instance);
+ free_irq(IRQ_AMIGA_PORTS, instance);
+ scsi_host_put(instance);
+ release_mem_region(res->start, resource_size(res));
+ return 0;
+}
+
+static struct platform_driver amiga_a3000_scsi_driver = {
+ .remove = __exit_p(amiga_a3000_scsi_remove),
+ .driver = {
+ .name = "amiga-a3000-scsi",
+ },
+};
+
+module_platform_driver_probe(amiga_a3000_scsi_driver, amiga_a3000_scsi_probe);
+
+MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:amiga-a3000-scsi");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-19 18:14:16 +0000