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/* $NetBSD: asc_ioasic.c,v 1.3 1996/10/13 01:38:36 christos 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/device.h>
#include <dev/tc/tcvar.h>
#include <dev/tc/ioasicvar.h>
#include <machine/autoconf.h>
#include <pmax/dev/device.h> /* XXX */
#include <pmax/dev/scsi.h> /* XXX */
#include <pmax/dev/ascreg.h> /* XXX */
#include <dev/tc/ascvar.h>
#include <machine/locore.h> /* XXX XXX bus.h needs cache-consistency*/
/*XXX*/
#include <pmax/pmax/asic.h> /* XXX ioasic register defs? */
#include <pmax/pmax/kmin.h> /* XXX ioasic register defs? */
#include <pmax/pmax/pmaxtype.h>
extern int pmax_boardtype;
/*
* Autoconfiguration data for config.
*/
int asc_ioasic_match __P((struct device *, void *, void *));
void asc_ioasic_attach __P((struct device *, struct device *, void *));
struct cfattach asc_ioasic_ca = {
sizeof(struct asc_softc), asc_ioasic_match, asc_ioasic_attach
};
/*
* DMA callback declarations
*/
extern u_long asc_iomem;
static void
asic_dma_start __P((asc_softc_t asc, State *state, caddr_t cp, int flag));
static void
asic_dma_end __P((asc_softc_t asc, State *state, int flag));
int
asc_ioasic_match(parent, match, aux)
struct device *parent;
void *match;
void *aux;
{
struct ioasicdev_attach_args *d = aux;
void *ascaddr;
if (strncmp(d->iada_modname, "asc", TC_ROM_LLEN) &&
strncmp(d->iada_modname, "PMAZ-AA ", TC_ROM_LLEN))
return (0);
/* probe for chip */
ascaddr = (void*)d->iada_addr;
if (tc_badaddr(ascaddr + ASC_OFFSET_53C94))
return (0);
return (1);
}
void
asc_ioasic_attach(parent, self, aux)
struct device *parent;
struct device *self;
void *aux;
{
register struct ioasicdev_attach_args *d = aux;
register asc_softc_t asc = (asc_softc_t) self;
int bufsiz, speed;
void *ascaddr;
int unit;
ascaddr = (void*)MACH_PHYS_TO_UNCACHED(d->iada_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
*/
asc->buff = (u_char *)MACH_PHYS_TO_UNCACHED(asc_iomem);
bufsiz = 8192;
*((volatile int *)IOASIC_REG_SCSI_DMAPTR(ioasic_base)) = -1;
*((volatile int *)IOASIC_REG_SCSI_DMANPTR(ioasic_base)) = -1;
*((volatile int *)IOASIC_REG_SCSI_SCR(ioasic_base)) = 0;
asc->dma_start = asic_dma_start;
asc->dma_end = asic_dma_end;
/*
* Now for timing. The 3max has a 25Mhz tb whereas the 3min and
* maxine are 12.5Mhz.
*/
/*printf(" (bus speed: %d) ", t->ta_busspeed);*/
/* XXX don't these run at 25MHz on any ioasic??*/
switch (pmax_boardtype) {
case DS_3MAX:
case DS_3MAXPLUS:
speed = ASC_SPEED_25_MHZ;
break;
case DS_3MIN:
case DS_MAXINE:
default:
speed = ASC_SPEED_12_5_MHZ;
break;
};
ascattach(asc, bufsiz, speed);
/* tie pseudo-slot to device */
ioasic_intr_establish(parent, d->iada_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 void
asic_dma_start(asc, state, cp, flag)
asc_softc_t asc;
State *state;
caddr_t cp;
int flag;
{
register volatile u_int *ssr = (volatile u_int *)
IOASIC_REG_CSR(ioasic_base);
u_int phys, nphys;
/* stop DMA engine first */
*ssr &= ~IOASIC_CSR_DMAEN_SCSI;
*((volatile int *)IOASIC_REG_SCSI_SCR(ioasic_base)) = 0;
phys = MACH_CACHED_TO_PHYS(cp);
cp = (caddr_t)mips_trunc_page(cp + NBPG);
nphys = MACH_CACHED_TO_PHYS(cp);
asc->dma_next = cp;
asc->dma_xfer = state->dmalen - (nphys - phys);
*(volatile int *)IOASIC_REG_SCSI_DMAPTR(ioasic_base) =
IOASIC_DMA_ADDR(phys);
*(volatile int *)IOASIC_REG_SCSI_DMANPTR(ioasic_base) =
IOASIC_DMA_ADDR(nphys);
if (flag == ASCDMA_READ)
*ssr |= IOASIC_CSR_SCSI_DIR | IOASIC_CSR_DMAEN_SCSI;
else
*ssr = (*ssr & ~IOASIC_CSR_SCSI_DIR) | IOASIC_CSR_DMAEN_SCSI;
wbflush();
}
static void
asic_dma_end(asc, state, flag)
asc_softc_t asc;
State *state;
int flag;
{
register volatile u_int *ssr = (volatile u_int *)
IOASIC_REG_CSR(ioasic_base);
register volatile u_int *dmap = (volatile u_int *)
IOASIC_REG_SCSI_DMAPTR(ioasic_base);
register u_short *to;
register int w;
int nb;
*ssr &= ~IOASIC_CSR_DMAEN_SCSI;
to = (u_short *)MACH_PHYS_TO_CACHED(*dmap >> 3);
*dmap = -1;
*((volatile int *)IOASIC_REG_SCSI_DMANPTR(ioasic_base)) = -1;
wbflush();
if (flag == ASCDMA_READ) {
MachFlushDCache(MACH_PHYS_TO_CACHED(
MACH_UNCACHED_TO_PHYS(state->dmaBufAddr)), state->dmalen);
if ( (nb = *((int *)IOASIC_REG_SCSI_SCR(ioasic_base))) != 0) {
/* pick up last upto6 bytes, sigh. */
/* Last byte really xferred is.. */
w = *(int *)IOASIC_REG_SCSI_SDR0(ioasic_base);
*to++ = w;
if (--nb > 0) {
w >>= 16;
*to++ = w;
}
if (--nb > 0) {
w = *(int *)IOASIC_REG_SCSI_SDR1(ioasic_base);
*to++ = w;
}
}
}
}
#ifdef notdef
/*
* Called by asic_intr() for scsi dma pointer update interrupts.
*/
void
asc_dma_intr()
{
asc_softc_t asc = &asc_cd.cd_devs[0]; /*XXX*/
u_int next_phys;
asc->dma_xfer -= NBPG;
if (asc->dma_xfer <= -NBPG) {
volatile u_int *ssr = (volatile u_int *)
IOASIC_REG_CSR(ioasic_base);
*ssr &= ~IOASIC_CSR_DMAEN_SCSI;
} else {
asc->dma_next += NBPG;
next_phys = MACH_CACHED_TO_PHYS(asc->dma_next);
}
*(volatile int *)IOASIC_REG_SCSI_DMANPTR(ioasic_base) =
IOASIC_DMA_ADDR(next_phys);
wbflush();
}
#endif /*notdef*/
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