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-rw-r--r--drivers/scsi/a2091.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/drivers/scsi/a2091.c b/drivers/scsi/a2091.c
new file mode 100644
index 000000000..5853db36e
--- /dev/null
+++ b/drivers/scsi/a2091.c
@@ -0,0 +1,264 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/zorro.h>
+#include <linux/module.h>
+
+#include <asm/page.h>
+#include <asm/amigaints.h>
+#include <asm/amigahw.h>
+
+#include "scsi.h"
+#include "wd33c93.h"
+#include "a2091.h"
+
+
+struct a2091_hostdata {
+ struct WD33C93_hostdata wh;
+ struct a2091_scsiregs *regs;
+};
+
+static irqreturn_t a2091_intr(int irq, void *data)
+{
+ struct Scsi_Host *instance = data;
+ struct a2091_hostdata *hdata = shost_priv(instance);
+ unsigned int status = hdata->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 a2091_hostdata *hdata = shost_priv(instance);
+ struct WD33C93_hostdata *wh = &hdata->wh;
+ struct a2091_scsiregs *regs = hdata->regs;
+ 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) {
+ 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;
+ }
+
+ /* get the physical address of the bounce buffer */
+ addr = virt_to_bus(wh->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(wh->dma_bounce_buffer);
+ wh->dma_bounce_buffer = NULL;
+ 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);
+ }
+ }
+
+ /* 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 */
+ regs->ST_DMA = 1;
+
+ /* return success */
+ return 0;
+}
+
+static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
+ int status)
+{
+ struct a2091_hostdata *hdata = shost_priv(instance);
+ struct WD33C93_hostdata *wh = &hdata->wh;
+ struct a2091_scsiregs *regs = hdata->regs;
+
+ /* disable SCSI interrupts */
+ unsigned short cntr = CNTR_PDMD;
+
+ if (!wh->dma_dir)
+ cntr |= CNTR_DDIR;
+
+ /* disable SCSI interrupts */
+ regs->CNTR = cntr;
+
+ /* flush if we were reading */
+ if (wh->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 && wh->dma_bounce_buffer) {
+ if (wh->dma_dir)
+ 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;
+ }
+}
+
+static struct scsi_host_template a2091_scsi_template = {
+ .module = THIS_MODULE,
+ .name = "Commodore A2091/A590 SCSI",
+ .show_info = wd33c93_show_info,
+ .write_info = wd33c93_write_info,
+ .proc_name = "A2901",
+ .queuecommand = wd33c93_queuecommand,
+ .eh_abort_handler = wd33c93_abort,
+ .eh_host_reset_handler = wd33c93_host_reset,
+ .can_queue = CAN_QUEUE,
+ .this_id = 7,
+ .sg_tablesize = SG_ALL,
+ .cmd_per_lun = CMD_PER_LUN,
+ .dma_boundary = PAGE_SIZE - 1,
+};
+
+static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
+{
+ struct Scsi_Host *instance;
+ int error;
+ struct a2091_scsiregs *regs;
+ wd33c93_regs wdregs;
+ struct a2091_hostdata *hdata;
+
+ if (!request_mem_region(z->resource.start, 256, "wd33c93"))
+ return -EBUSY;
+
+ instance = scsi_host_alloc(&a2091_scsi_template,
+ sizeof(struct a2091_hostdata));
+ if (!instance) {
+ error = -ENOMEM;
+ goto fail_alloc;
+ }
+
+ instance->irq = IRQ_AMIGA_PORTS;
+ instance->unique_id = z->slotaddr;
+
+ regs = ZTWO_VADDR(z->resource.start);
+ regs->DAWR = DAWR_A2091;
+
+ 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_8_10);
+ error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
+ "A2091 SCSI", instance);
+ if (error)
+ goto fail_irq;
+
+ regs->CNTR = CNTR_PDMD | CNTR_INTEN;
+
+ error = scsi_add_host(instance, NULL);
+ if (error)
+ goto fail_host;
+
+ zorro_set_drvdata(z, 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(z->resource.start, 256);
+ return error;
+}
+
+static void a2091_remove(struct zorro_dev *z)
+{
+ struct Scsi_Host *instance = zorro_get_drvdata(z);
+ struct a2091_hostdata *hdata = shost_priv(instance);
+
+ hdata->regs->CNTR = 0;
+ scsi_remove_host(instance);
+ free_irq(IRQ_AMIGA_PORTS, instance);
+ scsi_host_put(instance);
+ release_mem_region(z->resource.start, 256);
+}
+
+static struct zorro_device_id a2091_zorro_tbl[] = {
+ { ZORRO_PROD_CBM_A590_A2091_1 },
+ { ZORRO_PROD_CBM_A590_A2091_2 },
+ { 0 }
+};
+MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);
+
+static struct zorro_driver a2091_driver = {
+ .name = "a2091",
+ .id_table = a2091_zorro_tbl,
+ .probe = a2091_probe,
+ .remove = a2091_remove,
+};
+
+static int __init a2091_init(void)
+{
+ return zorro_register_driver(&a2091_driver);
+}
+module_init(a2091_init);
+
+static void __exit a2091_exit(void)
+{
+ zorro_unregister_driver(&a2091_driver);
+}
+module_exit(a2091_exit);
+
+MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 04:35:06 +0000