Viewing file:  gvp11.c (9.84 KB) -rw-r--r--
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#include <linux/types.h>
#include <linux/mm.h>
#include <linux/blk.h>
#include <linux/sched.h>
#include <linux/version.h>
#include <linux/init.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <linux/zorro.h>
#include <asm/irq.h>
#include <linux/spinlock.h>
#include "scsi.h"
#include "hosts.h"
#include "wd33c93.h"
#include "gvp11.h"
#include<linux/stat.h>
#define DMA(ptr) ((gvp11_scsiregs *)((ptr)->base))
#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
static struct Scsi_Host *first_instance = NULL;
static Scsi_Host_Template *gvp11_template;
static void gvp11_intr (int irq, void *dummy, struct pt_regs *fp)
{
unsigned long flags;
unsigned int status;
struct Scsi_Host *instance;
for (instance = first_instance; instance &&
instance->hostt == gvp11_template; instance = instance->next)
{
status = DMA(instance)->CNTR;
if (!(status & GVP11_DMAC_INT_PENDING))
continue;
spin_lock_irqsave(&io_request_lock, flags);
wd33c93_intr (instance);
spin_unlock_irqrestore(&io_request_lock, flags);
}
}
static int gvp11_xfer_mask = 0;
void gvp11_setup (char *str, int *ints)
{
gvp11_xfer_mask = ints[1];
}
static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
{
unsigned short cntr = GVP11_DMAC_INT_ENABLE;
unsigned long addr = virt_to_bus(cmd->SCp.ptr);
int bank_mask;
static int scsi_alloc_out_of_range = 0;
/* use bounce buffer if the physical address is bad */
if (addr & HDATA(cmd->host)->dma_xfer_mask ||
(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
{
HDATA(cmd->host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
& ~0x1ff;
if( !scsi_alloc_out_of_range ) {
HDATA(cmd->host)->dma_bounce_buffer =
scsi_malloc (HDATA(cmd->host)->dma_bounce_len);
HDATA(cmd->host)->dma_buffer_pool = BUF_SCSI_ALLOCED;
}
if ( scsi_alloc_out_of_range || !HDATA(cmd->host)->dma_bounce_buffer) {
HDATA(cmd->host)->dma_bounce_buffer =
amiga_chip_alloc(HDATA(cmd->host)->dma_bounce_len,
"GVP II SCSI Bounce Buffer");
if(!HDATA(cmd->host)->dma_bounce_buffer)
{
HDATA(cmd->host)->dma_bounce_len = 0;
return 1;
}
HDATA(cmd->host)->dma_buffer_pool = BUF_CHIP_ALLOCED;
}
/* check if the address of the bounce buffer is OK */
addr = virt_to_bus(HDATA(cmd->host)->dma_bounce_buffer);
if (addr & HDATA(cmd->host)->dma_xfer_mask) {
/* fall back to Chip RAM if address out of range */
if( HDATA(cmd->host)->dma_buffer_pool == BUF_SCSI_ALLOCED) {
scsi_free (HDATA(cmd->host)->dma_bounce_buffer,
HDATA(cmd->host)->dma_bounce_len);
scsi_alloc_out_of_range = 1;
} else {
amiga_chip_free (HDATA(cmd->host)->dma_bounce_buffer);
}
HDATA(cmd->host)->dma_bounce_buffer =
amiga_chip_alloc(HDATA(cmd->host)->dma_bounce_len,
"GVP II SCSI Bounce Buffer");
if(!HDATA(cmd->host)->dma_bounce_buffer)
{
HDATA(cmd->host)->dma_bounce_len = 0;
return 1;
}
addr = virt_to_bus(HDATA(cmd->host)->dma_bounce_buffer);
HDATA(cmd->host)->dma_buffer_pool = BUF_CHIP_ALLOCED;
}
if (!dir_in) {
/* copy to bounce buffer for a write */
memcpy (HDATA(cmd->host)->dma_bounce_buffer,
cmd->SCp.ptr, cmd->SCp.this_residual);
}
}
/* setup dma direction */
if (!dir_in)
cntr |= GVP11_DMAC_DIR_WRITE;
HDATA(cmd->host)->dma_dir = dir_in;
DMA(cmd->host)->CNTR = cntr;
/* setup DMA *physical* address */
DMA(cmd->host)->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);
if ((bank_mask = (~HDATA(cmd->host)->dma_xfer_mask >> 18) & 0x01c0))
DMA(cmd->host)->BANK = bank_mask & (addr >> 18);
/* start DMA */
DMA(cmd->host)->ST_DMA = 1;
/* return success */
return 0;
}
static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
int status)
{
/* stop DMA */
DMA(instance)->SP_DMA = 1;
/* remove write bit from CONTROL bits */
DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;
/* copy from a bounce buffer, if necessary */
if (status && HDATA(instance)->dma_bounce_buffer) {
if (HDATA(instance)->dma_dir && SCpnt)
memcpy (SCpnt->SCp.ptr,
HDATA(instance)->dma_bounce_buffer,
SCpnt->SCp.this_residual);
if (HDATA(instance)->dma_buffer_pool == BUF_SCSI_ALLOCED)
scsi_free (HDATA(instance)->dma_bounce_buffer,
HDATA(instance)->dma_bounce_len);
else
amiga_chip_free(HDATA(instance)->dma_bounce_buffer);
HDATA(instance)->dma_bounce_buffer = NULL;
HDATA(instance)->dma_bounce_len = 0;
}
}
static int num_gvp11 = 0;
#define CHECK_WD33C93
int __init gvp11_detect(Scsi_Host_Template *tpnt)
{
static unsigned char called = 0;
struct Scsi_Host *instance;
unsigned long address;
unsigned int epc;
struct zorro_dev *z = NULL;
unsigned int default_dma_xfer_mask;
wd33c93_regs regs;
#ifdef CHECK_WD33C93
volatile unsigned char *sasr_3393, *scmd_3393;
unsigned char save_sasr;
unsigned char q, qq;
#endif
if (!MACH_IS_AMIGA || called)
return 0;
called = 1;
tpnt->proc_name = "GVP11";
tpnt->proc_info = &wd33c93_proc_info;
while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
/*
* This should (hopefully) be the correct way to identify
* all the different GVP SCSI controllers (except for the
* SERIES I though).
*/
if (z->id == ZORRO_PROD_GVP_COMBO_030_R3_SCSI ||
z->id == ZORRO_PROD_GVP_SERIES_II)
default_dma_xfer_mask = ~0x00ffffff;
else if (z->id == ZORRO_PROD_GVP_GFORCE_030_SCSI ||
z->id == ZORRO_PROD_GVP_A530_SCSI ||
z->id == ZORRO_PROD_GVP_COMBO_030_R4_SCSI)
default_dma_xfer_mask = ~0x01ffffff;
else if (z->id == ZORRO_PROD_GVP_A1291 ||
z->id == ZORRO_PROD_GVP_GFORCE_040_SCSI_1)
default_dma_xfer_mask = ~0x07ffffff;
else
continue;
/*
* 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 asume it is a ram board and bail out.
*/
if (z->resource.end-z->resource.start != 0xffff)
continue;
address = z->resource.start;
if (!request_mem_region(address, 256, "wd33c93"))
continue;
#ifdef CHECK_WD33C93
/*
* 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 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SASR);
scmd_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SCMD);
save_sasr = *sasr_3393;
/* First test the AuxStatus Reg */
q = *sasr_3393; /* read it */
if (q & 0x08) /* bit 3 should always be clear */
goto release;
*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 */
goto release;
}
if (*sasr_3393 != q) { /* should still read the same */
*sasr_3393 = save_sasr; /* Oops - restore this byte */
goto release;
}
if (*scmd_3393 != q) /* and so should the image at 0x1f */
goto release;
/* 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 */
goto release;
*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 */
goto release;
*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 */
goto release;
#endif
instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
if(instance == NULL)
goto release;
instance->base = ZTWO_VADDR(address);
instance->irq = IRQ_AMIGA_PORTS;
instance->unique_id = z->slotaddr;
if (gvp11_xfer_mask)
HDATA(instance)->dma_xfer_mask = gvp11_xfer_mask;
else
HDATA(instance)->dma_xfer_mask = default_dma_xfer_mask;
DMA(instance)->secret2 = 1;
DMA(instance)->secret1 = 0;
DMA(instance)->secret3 = 15;
while (DMA(instance)->CNTR & GVP11_DMAC_BUSY) ;
DMA(instance)->CNTR = 0;
DMA(instance)->BANK = 0;
epc = *(unsigned short *)(ZTWO_VADDR(address) + 0x8000);
/*
* Check for 14MHz SCSI clock
*/
regs.SASR = &(DMA(instance)->SASR);
regs.SCMD = &(DMA(instance)->SCMD);
wd33c93_init(instance, regs, dma_setup, dma_stop,
(epc & GVP_SCSICLKMASK) ? WD33C93_FS_8_10
: WD33C93_FS_12_15);
if (num_gvp11++ == 0) {
first_instance = instance;
gvp11_template = instance->hostt;
request_irq(IRQ_AMIGA_PORTS, gvp11_intr, SA_SHIRQ,
"GVP11 SCSI", gvp11_intr);
}
DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;
continue;
release:
release_mem_region(address, 256);
}
return num_gvp11;
}
#define HOSTS_C
#include "gvp11.h"
static Scsi_Host_Template driver_template = GVP11_SCSI;
#include "scsi_module.c"
int gvp11_release(struct Scsi_Host *instance)
{
#ifdef MODULE
DMA(instance)->CNTR = 0;
release_mem_region(ZTWO_PADDR(instance->base), 256);
if (--num_gvp11 == 0)
free_irq(IRQ_AMIGA_PORTS, gvp11_intr);
wd33c93_release();
#endif
return 1;
}
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