blob: 74312400468ba6617899f71822f8ae6d088f8530 [file] [log] [blame]
// 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/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"
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;
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_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;
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) {
/* 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);
/* 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, 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) {
/* we could use chipmem... maybe later */
kfree(wh->dma_bounce_buffer);
wh->dma_bounce_buffer = NULL;
wh->dma_bounce_len = 0;
return 1;
}
scsi_pointer->dma_handle = addr;
}
/* 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;
/* no more cache flush here - dma_map_single() takes care */
/* 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 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;
/* 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;
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(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 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,
.cmd_size = sizeof(struct scsi_pointer),
};
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 (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;
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->dev = &z->dev;
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");