// 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 "gvp11.h"
#define CHECK_WD33C93
struct gvp11_hostdata {
struct WD33C93_hostdata wh;
struct gvp11_scsiregs *regs;
struct device *dev;
};
#define DMA_DIR(d) ((d == DATA_OUT_DIR) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
#define TO_DMA_MASK(m) (~((unsigned long long)m & 0xffffffff))
static irqreturn_t gvp11_intr(int irq, void *data)
{
struct Scsi_Host *instance = data;
struct gvp11_hostdata *hdata = shost_priv(instance);
unsigned int status = hdata->regs->CNTR;
unsigned long flags;
if (!(status & GVP11_DMAC_INT_PENDING))
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 gvp11_xfer_mask = 0;
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 gvp11_hostdata *hdata = shost_priv(instance);
struct WD33C93_hostdata *wh = &hdata->wh;
struct gvp11_scsiregs *regs = hdata->regs;
unsigned short cntr = GVP11_DMAC_INT_ENABLE;
dma_addr_t addr;
int bank_mask;
static int scsi_alloc_out_of_range = 0;
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;
/* use bounce buffer if the physical address is bad */
if (addr & wh->dma_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;
if (!scsi_alloc_out_of_range) {
wh->dma_bounce_buffer =
kmalloc(wh->dma_bounce_len, GFP_KERNEL);
wh->dma_buffer_pool = BUF_SCSI_ALLOCED;
}
if (scsi_alloc_out_of_range ||
!wh->dma_bounce_buffer) {
wh->dma_bounce_buffer =
amiga_chip_alloc(wh->dma_bounce_len,
"GVP II SCSI Bounce Buffer");
if (!wh->dma_bounce_buffer) {
wh->dma_bounce_len = 0;
return 1;
}
wh->dma_buffer_pool = BUF_CHIP_ALLOCED;
}
if (!dir_in) {
/* copy to bounce buffer for a write */
memcpy(wh->dma_bounce_buffer, scsi_pointer->ptr,
scsi_pointer->this_residual);
}
if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED) {
/* 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;
}
}
if (addr & wh->dma_xfer_mask) {
/* drop useless mapping */
dma_unmap_single(hdata->dev, scsi_pointer->dma_handle,
scsi_pointer->this_residual,
DMA_DIR(dir_in));
/* fall back to Chip RAM if address out of range */
if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED) {
kfree(wh->dma_bounce_buffer);
scsi_alloc_out_of_range = 1;
} else {
amiga_chip_free(wh->dma_bounce_buffer);
}
wh->dma_bounce_buffer =
amiga_chip_alloc(wh->dma_bounce_len,
"GVP II SCSI Bounce Buffer");
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);
}
/* chip RAM can be mapped to phys. address directly */
addr = virt_to_phys(wh->dma_bounce_buffer);
/* no need to flush/invalidate cache */
wh->dma_buffer_pool = BUF_CHIP_ALLOCED;
}
/* finally, have OK mapping (punted for PIO else) */
scsi_pointer->dma_handle = addr;
}
/* setup dma direction */
if (!dir_in)
cntr |= GVP11_DMAC_DIR_WRITE;
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 */
bank_mask = (~wh->dma_xfer_mask >> 18) & 0x01c0;
if (bank_mask)
regs->BANK = bank_mask & (addr >> 18);
/* 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 gvp11_hostdata *hdata = shost_priv(instance);
struct WD33C93_hostdata *wh = &hdata->wh;
struct gvp11_scsiregs *regs = hdata->regs;
/* stop DMA */
regs->SP_DMA = 1;
/* remove write bit from CONTROL bits */
regs->CNTR = GVP11_DMAC_INT_ENABLE;
if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED)
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 && SCpnt)
memcpy(scsi_pointer->ptr, wh->dma_bounce_buffer,
scsi_pointer->this_residual);
if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED)
kfree(wh->dma_bounce_buffer);
else
amiga_chip_free(wh->dma_bounce_buffer);
wh->dma_bounce_buffer = NULL;
wh->dma_bounce_len = 0;
}
}
static const struct scsi_host_template gvp11_scsi_template = {
.module = THIS_MODULE,
.name = "GVP Series II SCSI",
.show_info = wd33c93_show_info,
.write_info = wd33c93_write_info,
.proc_name = "GVP11",
.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 check_wd33c93(struct gvp11_scsiregs *regs)
{
#ifdef CHECK_WD33C93
volatile unsigned char *sasr_3393, *scmd_3393;
unsigned char save_sasr;
unsigned char q, qq;
/*
* These darn GVP boards are a problem - it can be tough to tell
* whether or not they include a SCSI controller. This is the
* ultimate Yet-Another-GVP-Detection-Hack in that it actually
* probes for a WD33c93 chip: If we find one, it's extremely
* likely that this card supports SCSI, regardless of Product_
* Code, Board_Size, etc.
*/
/* Get pointers to the presumed register locations and save contents */
sasr_3393 = ®s->SASR;
scmd_3393 = ®s->SCMD;
save_sasr = *sasr_3393;
/* First test the AuxStatus Reg */
q = *sasr_3393; /* read it */
if (q & 0x08) /* bit 3 should always be clear */
return -ENODEV;
*sasr_3393 = WD_AUXILIARY_STATUS; /* setup indirect address */
if (*sasr_3393 == WD_AUXILIARY_STATUS) { /* shouldn't retain the write */
*sasr_3393 = save_sasr; /* Oops - restore this byte */
return -ENODEV;
}
if (*sasr_3393 != q) { /* should still read the same */
*sasr_3393 = save_sasr; /* Oops - restore this byte */
return -ENODEV;
}
if (*scmd_3393 != q) /* and so should the image at 0x1f */
return -ENODEV;
/*
* Ok, we probably have a wd33c93, but let's check a few other places
* for good measure. Make sure that this works for both 'A and 'B
* chip versions.
*/
*sasr_3393 = WD_SCSI_STATUS;
q = *scmd_3393;
*sasr_3393 = WD_SCSI_STATUS;
*scmd_3393 = ~q;
*sasr_3393 = WD_SCSI_STATUS;
qq = *scmd_3393;
*sasr_3393 = WD_SCSI_STATUS;
*scmd_3393 = q;
if (qq != q) /* should be read only */
return -ENODEV;
*sasr_3393 = 0x1e; /* this register is unimplemented */
q = *scmd_3393;
*sasr_3393 = 0x1e;
*scmd_3393 = ~q;
*sasr_3393 = 0x1e;
qq = *scmd_3393;
*sasr_3393 = 0x1e;
*scmd_3393 = q;
if (qq != q || qq != 0xff) /* should be read only, all 1's */
return -ENODEV;
*sasr_3393 = WD_TIMEOUT_PERIOD;
q = *scmd_3393;
*sasr_3393 = WD_TIMEOUT_PERIOD;
*scmd_3393 = ~q;
*sasr_3393 = WD_TIMEOUT_PERIOD;
qq = *scmd_3393;
*sasr_3393 = WD_TIMEOUT_PERIOD;
*scmd_3393 = q;
if (qq != (~q & 0xff)) /* should be read/write */
return -ENODEV;
#endif /* CHECK_WD33C93 */
return 0;
}
static int gvp11_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
{
struct Scsi_Host *instance;
unsigned long address;
int error;
unsigned int epc;
unsigned int default_dma_xfer_mask;
struct gvp11_hostdata *hdata;
struct gvp11_scsiregs *regs;
wd33c93_regs wdregs;
default_dma_xfer_mask = ent->driver_data;
if (dma_set_mask_and_coherent(&z->dev,
TO_DMA_MASK(default_dma_xfer_mask))) {
dev_warn(&z->dev, "cannot use DMA mask %llx\n",
TO_DMA_MASK(default_dma_xfer_mask));
return -ENODEV;
}
/*
* Rumors state that some GVP ram boards use the same product
* code as the SCSI controllers. Therefore if the board-size
* is not 64KB we assume it is a ram board and bail out.
*/
if (zorro_resource_len(z) != 0x10000)
return -ENODEV;
address = z->resource.start;
if (!request_mem_region(address, 256, "wd33c93"))
return -EBUSY;
regs = ZTWO_VADDR(address);
error = check_wd33c93(regs);
if (error)
goto fail_check_or_alloc;
instance = scsi_host_alloc(&gvp11_scsi_template,
sizeof(struct gvp11_hostdata));
if (!instance) {
error = -ENOMEM;
goto fail_check_or_alloc;
}
instance->irq = IRQ_AMIGA_PORTS;
instance->unique_id = z->slotaddr;
regs->secret2 = 1;
regs->secret1 = 0;
regs->secret3 = 15;
while (regs->CNTR & GVP11_DMAC_BUSY)
;
regs->CNTR = 0;
regs->BANK = 0;
wdregs.SASR = ®s->SASR;
wdregs.SCMD = ®s->SCMD;
hdata = shost_priv(instance);
if (gvp11_xfer_mask) {
hdata->wh.dma_xfer_mask = gvp11_xfer_mask;
if (dma_set_mask_and_coherent(&z->dev,
TO_DMA_MASK(gvp11_xfer_mask))) {
dev_warn(&z->dev, "cannot use DMA mask %llx\n",
TO_DMA_MASK(gvp11_xfer_mask));
error = -ENODEV;
goto fail_check_or_alloc;
}
} else
hdata->wh.dma_xfer_mask = default_dma_xfer_mask;
hdata->wh.no_sync = 0xff;
hdata->wh.fast = 0;
hdata->wh.dma_mode = CTRL_DMA;
hdata->regs = regs;
/*
* Check for 14MHz SCSI clock
*/
epc = *(unsigned short *)(ZTWO_VADDR(address) + 0x8000);
wd33c93_init(instance, wdregs, dma_setup, dma_stop,
(epc & GVP_SCSICLKMASK) ? WD33C93_FS_8_10
: WD33C93_FS_12_15);
error = request_irq(IRQ_AMIGA_PORTS, gvp11_intr, IRQF_SHARED,
"GVP11 SCSI", instance);
if (error)
goto fail_irq;
regs->CNTR = GVP11_DMAC_INT_ENABLE;
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_check_or_alloc:
release_mem_region(address, 256);
return error;
}
static void gvp11_remove(struct zorro_dev *z)
{
struct Scsi_Host *instance = zorro_get_drvdata(z);
struct gvp11_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);
}
/*
* This should (hopefully) be the correct way to identify
* all the different GVP SCSI controllers (except for the
* SERIES I though).
*/
static struct zorro_device_id gvp11_zorro_tbl[] = {
{ ZORRO_PROD_GVP_COMBO_030_R3_SCSI, ~0x00ffffff },
{ ZORRO_PROD_GVP_SERIES_II, ~0x00ffffff },
{ ZORRO_PROD_GVP_GFORCE_030_SCSI, ~0x01ffffff },
{ ZORRO_PROD_GVP_A530_SCSI, ~0x01ffffff },
{ ZORRO_PROD_GVP_COMBO_030_R4_SCSI, ~0x01ffffff },
{ ZORRO_PROD_GVP_A1291, ~0x07ffffff },
{ ZORRO_PROD_GVP_GFORCE_040_SCSI_1, ~0x07ffffff },
{ 0 }
};
MODULE_DEVICE_TABLE(zorro, gvp11_zorro_tbl);
static struct zorro_driver gvp11_driver = {
.name = "gvp11",
.id_table = gvp11_zorro_tbl,
.probe = gvp11_probe,
.remove = gvp11_remove,
};
static int __init gvp11_init(void)
{
return zorro_register_driver(&gvp11_driver);
}
module_init(gvp11_init);
static void __exit gvp11_exit(void)
{
zorro_unregister_driver(&gvp11_driver);
}
module_exit(gvp11_exit);
MODULE_DESCRIPTION("GVP Series II SCSI");
MODULE_LICENSE("GPL");
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