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/* $OpenBSD: asc_tc.c,v 1.3 1998/05/18 00:25:09 millert Exp $ */
/* $NetBSD: asc_tc.c,v 1.8 1997/10/31 06:29:59 jonathan Exp $ */
/*
* Copyright 1996 The Board of Trustees of The Leland Stanford
* Junior University. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies. Stanford University
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/device.h>
#include <dev/tc/tcvar.h>
#include <machine/autoconf.h>
#include <dev/tc/ioasicvar.h>
#include <pmax/dev/device.h> /* XXX */
#include <pmax/dev/scsi.h> /* XXX */
#include <pmax/dev/ascreg.h> /* XXX */
#include <dev/tc/ascvar.h>
/*XXX*/
/*
* Autoconfiguration data for config.
*/
int asc_tc_match __P((struct device *, void *, void *));
void asc_tc_attach __P((struct device *, struct device *, void *));
struct cfattach asc_tc_ca = {
sizeof(struct asc_softc), asc_tc_match, asc_tc_attach
};
/*
* DMA callbacks
*/
static int
tc_dma_start __P((struct asc_softc *asc, struct scsi_state *state,
caddr_t cp, int flag, int len, int off));
static void
tc_dma_end __P((struct asc_softc *asc, struct scsi_state *state,
int flag));
int
asc_tc_match(parent, match, aux)
struct device *parent;
void *match;
void *aux;
{
struct tc_attach_args *t = aux;
void *ascaddr;
if (strncmp(t->ta_modname, "PMAZ-AA ", TC_ROM_LLEN))
return (0);
ascaddr = (void*)t->ta_addr;
if (tc_badaddr(ascaddr + ASC_OFFSET_53C94))
return (0);
return (1);
}
void
asc_tc_attach(parent, self, aux)
struct device *parent;
struct device *self;
void *aux;
{
register struct tc_attach_args *t = aux;
register asc_softc_t asc = (asc_softc_t) self;
u_char *buff;
int i, speed;
void *ascaddr;
int unit;
/* Use uncached address for chip registers. */
ascaddr = (void*)MIPS_PHYS_TO_KSEG1(t->ta_addr);
unit = asc->sc_dev.dv_unit;
/*
* Initialize hw descriptor, cache some pointers
*/
asc->regs = (asc_regmap_t *)(ascaddr + ASC_OFFSET_53C94);
/*
* Set up machine dependencies.
* (1) how to do dma
* (2) timing based on turbochannel frequency
*/
/*
* Fall through for turbochannel option.
*/
asc->dmar = (volatile int *)(ascaddr + ASC_OFFSET_DMAR);
buff = (u_char *)(ascaddr + ASC_OFFSET_RAM);
/*
* Statically partition the DMA buffer between targets.
* This way we will eventually be able to attach/detach
* drives on-fly. And 18k/target is plenty for normal use.
*/
/*
* Give each target its own DMA buffer region.
* We may want to try ping ponging buffers later.
*/
for (i = 0; i < ASC_NCMD; i++)
asc->st[i].dmaBufAddr = buff + PER_TGT_DMA_SIZE * i;
asc->dma_start = tc_dma_start;
asc->dma_end = tc_dma_end;
/*
* Now for timing. The 3max has a 25Mhz tb whereas the 3min and
* maxine are 12.5Mhz.
*/
printf(" (bus speed: %s MHz) ", t->ta_busspeed? "25" : "12.5");
switch (t->ta_busspeed) {
case TC_SPEED_25_MHZ:
speed = ASC_SPEED_25_MHZ;
break;
default:
printf(" (unknown TC speed, assuming 12.5MHz) ");
/* FALLTHROUGH*/
case TC_SPEED_12_5_MHZ:
speed = ASC_SPEED_12_5_MHZ;
break;
};
ascattach(asc, speed);
/* tie pseudo-slot to device */
tc_intr_establish(parent, t->ta_cookie, TC_IPL_BIO,
asc_intr, asc);
}
/*
* DMA handling routines. For a turbochannel device, just set the dmar.
* For the I/O ASIC, handle the actual DMA interface.
*/
static int
tc_dma_start(asc, state, cp, flag, len, off)
asc_softc_t asc;
State *state;
caddr_t cp;
int flag;
int len;
int off;
{
if (len > PER_TGT_DMA_SIZE)
len = PER_TGT_DMA_SIZE;
if (flag == ASCDMA_WRITE)
bcopy(cp, state->dmaBufAddr + off, len);
if (flag == ASCDMA_WRITE)
*asc->dmar = ASC_DMAR_WRITE | ASC_DMA_ADDR(state->dmaBufAddr + off);
else
*asc->dmar = ASC_DMA_ADDR(state->dmaBufAddr + off);
return (len);
}
static void
tc_dma_end(asc, state, flag)
asc_softc_t asc;
State *state;
int flag;
{
if (flag == ASCDMA_READ)
bcopy(state->dmaBufAddr, state->buf, state->dmalen);
}
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