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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.c103
1 files changed, 63 insertions, 40 deletions
diff --git a/drivers/scsi/a2091.c b/drivers/scsi/a2091.c
index 30fa38a0ad39..204448bfd04b 100644
--- a/drivers/scsi/a2091.c
+++ b/drivers/scsi/a2091.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
#include <linux/types.h>
#include <linux/init.h>
#include <linux/interrupt.h>
@@ -8,11 +9,14 @@
#include <linux/module.h>
#include <asm/page.h>
-#include <asm/pgtable.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
-#include "scsi.h"
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_tcq.h>
#include "wd33c93.h"
#include "a2091.h"
@@ -20,8 +24,11 @@
struct a2091_hostdata {
struct WD33C93_hostdata wh;
struct a2091_scsiregs *regs;
+ struct device *dev;
};
+#define DMA_DIR(d) ((d == DATA_OUT_DIR) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
+
static irqreturn_t a2091_intr(int irq, void *data)
{
struct Scsi_Host *instance = data;
@@ -40,16 +47,33 @@ static irqreturn_t a2091_intr(int irq, void *data)
static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
{
+ struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
+ unsigned long len = scsi_pointer->this_residual;
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);
+ dma_addr_t addr;
+
+ addr = dma_map_single(hdata->dev, scsi_pointer->ptr,
+ len, DMA_DIR(dir_in));
+ if (dma_mapping_error(hdata->dev, addr)) {
+ dev_warn(hdata->dev, "cannot map SCSI data block %p\n",
+ scsi_pointer->ptr);
+ return 1;
+ }
+ scsi_pointer->dma_handle = addr;
/* 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;
+ /* drop useless mapping */
+ dma_unmap_single(hdata->dev, scsi_pointer->dma_handle,
+ scsi_pointer->this_residual,
+ DMA_DIR(dir_in));
+ scsi_pointer->dma_handle = (dma_addr_t) NULL;
+
+ wh->dma_bounce_len = (scsi_pointer->this_residual + 511) & ~0x1ff;
wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
GFP_KERNEL);
@@ -59,8 +83,21 @@ static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
return 1;
}
- /* get the physical address of the bounce buffer */
- addr = virt_to_bus(wh->dma_bounce_buffer);
+ if (!dir_in) {
+ /* copy to bounce buffer for a write */
+ memcpy(wh->dma_bounce_buffer, scsi_pointer->ptr,
+ scsi_pointer->this_residual);
+ }
+
+ /* will flush/invalidate cache for us */
+ addr = dma_map_single(hdata->dev, wh->dma_bounce_buffer,
+ wh->dma_bounce_len, DMA_DIR(dir_in));
+ /* can't map buffer; use PIO */
+ if (dma_mapping_error(hdata->dev, addr)) {
+ dev_warn(hdata->dev, "cannot map bounce buffer %p\n",
+ wh->dma_bounce_buffer);
+ return 1;
+ }
/* the bounce buffer may not be in the first 16M of physmem */
if (addr & A2091_XFER_MASK) {
@@ -71,11 +108,7 @@ static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
return 1;
}
- if (!dir_in) {
- /* copy to bounce buffer for a write */
- memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
- cmd->SCp.this_residual);
- }
+ scsi_pointer->dma_handle = addr;
}
/* setup dma direction */
@@ -90,13 +123,8 @@ static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
/* 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);
- }
+ /* no more cache flush here - dma_map_single() takes care */
+
/* start DMA */
regs->ST_DMA = 1;
@@ -107,6 +135,7 @@ static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
int status)
{
+ struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(SCpnt);
struct a2091_hostdata *hdata = shost_priv(instance);
struct WD33C93_hostdata *wh = &hdata->wh;
struct a2091_scsiregs *regs = hdata->regs;
@@ -136,34 +165,22 @@ static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
/* restore the CONTROL bits (minus the direction flag) */
regs->CNTR = CNTR_PDMD | CNTR_INTEN;
+ dma_unmap_single(hdata->dev, scsi_pointer->dma_handle,
+ scsi_pointer->this_residual,
+ DMA_DIR(wh->dma_dir));
+
/* 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);
+ memcpy(scsi_pointer->ptr, wh->dma_bounce_buffer,
+ scsi_pointer->this_residual);
kfree(wh->dma_bounce_buffer);
wh->dma_bounce_buffer = NULL;
wh->dma_bounce_len = 0;
}
}
-static int a2091_bus_reset(struct scsi_cmnd *cmd)
-{
- struct Scsi_Host *instance = cmd->device->host;
-
- /* 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(instance->host_lock);
- wd33c93_host_reset(cmd);
- spin_unlock_irq(instance->host_lock);
-
- return SUCCESS;
-}
-
-static struct scsi_host_template a2091_scsi_template = {
+static const struct scsi_host_template a2091_scsi_template = {
.module = THIS_MODULE,
.name = "Commodore A2091/A590 SCSI",
.show_info = wd33c93_show_info,
@@ -171,13 +188,13 @@ static struct scsi_host_template a2091_scsi_template = {
.proc_name = "A2901",
.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
+ .dma_boundary = PAGE_SIZE - 1,
+ .cmd_size = sizeof(struct scsi_pointer),
};
static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
@@ -188,6 +205,11 @@ static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
wd33c93_regs wdregs;
struct a2091_hostdata *hdata;
+ if (dma_set_mask_and_coherent(&z->dev, DMA_BIT_MASK(24))) {
+ dev_warn(&z->dev, "cannot use 24 bit DMA\n");
+ return -ENODEV;
+ }
+
if (!request_mem_region(z->resource.start, 256, "wd33c93"))
return -EBUSY;
@@ -201,13 +223,14 @@ static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
instance->irq = IRQ_AMIGA_PORTS;
instance->unique_id = z->slotaddr;
- regs = (struct a2091_scsiregs *)ZTWO_VADDR(z->resource.start);
+ regs = ZTWO_VADDR(z->resource.start);
regs->DAWR = DAWR_A2091;
wdregs.SASR = &regs->SASR;
wdregs.SCMD = &regs->SCMD;
hdata = shost_priv(instance);
+ hdata->dev = &z->dev;
hdata->wh.no_sync = 0xff;
hdata->wh.fast = 0;
hdata->wh.dma_mode = CTRL_DMA;
generated by cgit (git 2.34.1) at 2025-12-25 09:56:49 +0000