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/* $Id: sgiwd93.c,v 1.7 1996/07/23 09:00:16 dm Exp $
* sgiwd93.c: SGI WD93 scsi driver.
*
* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
*
* (In all truth, Jed Schimmel wrote all this code.)
*/
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/blk.h>
#include <linux/version.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/sgi.h>
#include <asm/sgialib.h>
#include <asm/sgimc.h>
#include <asm/sgihpc.h>
#include <asm/sgint23.h>
#include <asm/irq.h>
#include "scsi.h"
#include "hosts.h"
#include "wd33c93.h"
#include "sgiwd93.h"
#include <linux/stat.h>
struct hpc_chunk {
struct hpc_dma_desc desc;
unsigned long padding;
};
struct proc_dir_entry proc_scsi_sgiwd93 = {
PROC_SCSI_SGIWD93, 5, "SGIWD93",
S_IFDIR | S_IRUGO | S_IXUGO, 2
};
struct Scsi_Host *sgiwd93_host = NULL;
/* Wuff wuff, wuff, wd33c93.c, wuff wuff, object oriented, bow wow. */
static inline void write_wd33c93_count(wd33c93_regs *regp, unsigned long value)
{
regp->SASR = WD_TRANSFER_COUNT_MSB;
regp->SCMD = ((value >> 16) & 0xff);
regp->SCMD = ((value >> 8) & 0xff);
regp->SCMD = ((value >> 0) & 0xff);
}
static inline unsigned long read_wd33c93_count(wd33c93_regs *regp)
{
unsigned long value;
regp->SASR = WD_TRANSFER_COUNT_MSB;
value = ((regp->SCMD & 0xff) << 16);
value |= ((regp->SCMD & 0xff) << 8);
value |= ((regp->SCMD & 0xff) << 0);
return value;
}
/* XXX woof! */
static void sgiwd93_intr(int irq, void *dev_id, struct pt_regs *regs)
{
wd33c93_intr(sgiwd93_host);
}
#undef DEBUG_DMA
static int dma_setup(Scsi_Cmnd *cmd, int datainp)
{
struct WD33C93_hostdata *hdata = CMDHOSTDATA(cmd);
wd33c93_regs *regp = hdata->regp;
struct hpc3_scsiregs *hregs = (struct hpc3_scsiregs *) cmd->host->base;
struct hpc_chunk *hcp = (struct hpc_chunk *) hdata->dma_bounce_buffer;
#ifdef DEBUG_DMA
printk("dma_setup: datainp<%d> hcp<%p> ",
datainp, hcp);
#endif
hdata->dma_dir = datainp;
if(cmd->use_sg) {
struct scatterlist *slp = cmd->SCp.buffer;
int i, totlen = 0;
#ifdef DEBUG_DMA
printk("SCLIST<");
#endif
for(i = 0; i <= (cmd->use_sg - 1); i++, hcp++) {
#ifdef DEBUG_DMA
printk("[%p,%d]", slp[i].address, slp[i].length);
#endif
flush_page_to_ram((unsigned long)slp[i].address);
hcp->desc.pbuf = PHYSADDR(slp[i].address);
hcp->desc.cntinfo = (slp[i].length & HPCDMA_BCNT);
totlen += slp[i].length;
}
#ifdef DEBUG_DMA
printk(">tlen<%d>", totlen);
#endif
hdata->dma_bounce_len = totlen; /* a trick... */
write_wd33c93_count(regp, totlen);
} else {
/* Non-scattered dma. */
#ifdef DEBUG_DMA
printk("ONEBUF<%p,%d>", cmd->SCp.ptr, cmd->SCp.this_residual);
#endif
flush_page_to_ram((unsigned long)cmd->SCp.ptr);
hcp->desc.pbuf = PHYSADDR(cmd->SCp.ptr);
hcp->desc.cntinfo = (cmd->SCp.this_residual & HPCDMA_BCNT);
hcp++;
write_wd33c93_count(regp, cmd->SCp.this_residual);
}
/* To make sure, if we trip an HPC bug, that we transfer
* every single byte, we tag on an extra zero length dma
* descriptor at the end of the chain.
*/
hcp->desc.pbuf = 0;
hcp->desc.cntinfo = (HPCDMA_EOX);
#ifdef DEBUG_DMA
printk(" HPCGO\n");
#endif
/* Start up the HPC. */
hregs->ndptr = PHYSADDR(hdata->dma_bounce_buffer);
if(datainp)
hregs->ctrl = (HPC3_SCTRL_ACTIVE);
else
hregs->ctrl = (HPC3_SCTRL_ACTIVE | HPC3_SCTRL_DIR);
return 0;
}
static void dma_stop(struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
int status)
{
struct WD33C93_hostdata *hdata = INSTHOSTDATA(instance);
wd33c93_regs *regp = hdata->regp;
struct hpc3_scsiregs *hregs = (struct hpc3_scsiregs *) SCpnt->host->base;
#ifdef DEBUG_DMA
printk("dma_stop: status<%d> ", status);
#endif
/* First stop the HPC and flush it's FIFO. */
if(hdata->dma_dir) {
hregs->ctrl |= HPC3_SCTRL_FLUSH;
while(hregs->ctrl & HPC3_SCTRL_ACTIVE)
barrier();
}
hregs->ctrl = 0;
/* See how far we got and update scatterlist state if necessary. */
if(SCpnt->use_sg) {
struct scatterlist *slp = SCpnt->SCp.buffer;
int totlen, wd93_residual, transferred, i;
/* Yep, we were doing the scatterlist thang. */
totlen = hdata->dma_bounce_len;
wd93_residual = read_wd33c93_count(regp);
transferred = totlen - wd93_residual;
#ifdef DEBUG_DMA
printk("tlen<%d>resid<%d>transf<%d> ",
totlen, wd93_residual, transferred);
#endif
/* Avoid long winded partial-transfer search for common case. */
if(transferred != totlen) {
/* This is the nut case. */
#ifdef DEBUG_DMA
printk("Jed was here...");
#endif
for(i = 0; i <= (SCpnt->use_sg - 1); i++) {
if(slp[i].length >= transferred)
break;
transferred -= slp[i].length;
}
} else {
/* This is the common case. */
#ifdef DEBUG_DMA
printk("did it all...");
#endif
i = (SCpnt->use_sg - 1);
}
SCpnt->SCp.buffer = &slp[i];
SCpnt->SCp.buffers_residual = (SCpnt->use_sg - 1 - i);
SCpnt->SCp.ptr = (char *) slp[i].address;
SCpnt->SCp.this_residual = slp[i].length;
}
#ifdef DEBUG_DMA
printk("\n");
#endif
}
static inline void init_hpc_chain(uchar *buf)
{
struct hpc_chunk *hcp = (struct hpc_chunk *) buf;
unsigned long start, end;
start = (unsigned long) buf;
end = start + PAGE_SIZE;
while(start < end) {
hcp->desc.pnext = PHYSADDR((hcp + 1));
hcp->desc.cntinfo = HPCDMA_EOX;
hcp++;
start += sizeof(struct hpc_chunk);
};
hcp--;
hcp->desc.pnext = PHYSADDR(buf);
}
int sgiwd93_detect(Scsi_Host_Template *HPsUX)
{
static unsigned char called = 0;
struct hpc3_scsiregs *hregs = &hpc3c0->scsi_chan0;
struct WD33C93_hostdata *hdata;
uchar *buf;
if(called)
return 0; /* Should bitch on the console about this... */
HPsUX->proc_dir = &proc_scsi_sgiwd93;
sgiwd93_host = scsi_register(HPsUX, sizeof(struct WD33C93_hostdata));
sgiwd93_host->base = (unsigned char *) hregs;
buf = (uchar *) get_free_page(GFP_KERNEL);
init_hpc_chain(buf);
flush_page_to_ram((unsigned long) buf);
wd33c93_init(sgiwd93_host, (wd33c93_regs *) 0xbfbc0003,
dma_setup, dma_stop, WD33C93_FS_16_20);
hdata = INSTHOSTDATA(sgiwd93_host);
hdata->no_sync = 0;
hdata->dma_bounce_buffer = (uchar *) (KSEG1ADDR(buf));
flush_page_to_ram((unsigned long) buf);
request_irq(1, sgiwd93_intr, 0, "SGI WD93", (void *) sgiwd93_host);
called = 1;
return 1; /* Found one. */
}
#ifdef MODULE
#define HOSTS_C
#include "sgiwd93.h"
Scsi_Host_Template driver_template = SGIWD93_SCSI;
#include "scsi_module.c"
#endif
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