NetBSD/sys/arch/sparc/dev/dma.c

363 lines
9.3 KiB
C

/* $NetBSD: dma.c,v 1.9 1995/03/01 21:09:19 pk Exp $ */
/*
* Copyright (c) 1994 Peter Galbavy. All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Peter Galbavy.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sparc/autoconf.h>
#include <sparc/cpu.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <sparc/dev/sbusvar.h>
#include <sparc/dev/dmareg.h>
#include <sparc/dev/dmavar.h>
#include <sparc/dev/espreg.h>
#include <sparc/dev/espvar.h>
int dmaprint __P((void *, char *));
void dmaattach __P((struct device *, struct device *, void *));
int dmamatch __P((struct device *, void *, void *));
void dma_reset __P((struct dma_softc *));
void dma_enintr __P((struct dma_softc *));
int dma_isintr __P((struct dma_softc *));
void dma_start __P((struct dma_softc *, caddr_t *, size_t *, int));
int dmaintr __P((struct dma_softc *));
struct cfdriver dmacd = {
NULL, "dma", dmamatch, dmaattach,
DV_DULL, sizeof(struct dma_softc)
};
struct cfdriver ledmacd = {
NULL, "ledma", matchbyname, dmaattach,
DV_DULL, sizeof(struct dma_softc)
};
struct cfdriver espdmacd = {
NULL, "espdma", matchbyname, dmaattach,
DV_DULL, sizeof(struct dma_softc)
};
int
dmaprint(aux, name)
void *aux;
char *name;
{
return -1;
}
int
dmamatch(parent, vcf, aux)
struct device *parent;
void *vcf, *aux;
{
struct cfdata *cf = vcf;
register struct confargs *ca = aux;
register struct romaux *ra = &ca->ca_ra;
if (strcmp(cf->cf_driver->cd_name, ra->ra_name))
return (0);
if (ca->ca_bustype == BUS_SBUS)
return (1);
ra->ra_len = NBPG;
return (probeget(ra->ra_vaddr, 1) != -1);
}
/*
* Attach all the sub-devices we can find
*/
void
dmaattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
register struct confargs *ca = aux;
struct dma_softc *sc = (void *)self;
int node, base, slot;
char *name;
/*
* do basic sbus stuff (I think)
*/
if (ca->ca_ra.ra_vaddr == NULL)
ca->ca_ra.ra_vaddr = mapiodev(ca->ca_ra.ra_paddr,
ca->ca_ra.ra_len, ca->ca_bustype);
if ((u_long)ca->ca_ra.ra_paddr & PGOFSET)
(u_long)ca->ca_ra.ra_vaddr |= ((u_long)ca->ca_ra.ra_paddr & PGOFSET);
sc->sc_regs = (struct dma_regs *) ca->ca_ra.ra_vaddr;
/*
* find the ESP by poking around the esp device structures
*
* What happens here is that if the esp driver has not been
* configured, then this returns a NULL pointer. Then when the
* esp actually gets configured, it does the opposing test, and
* if the sc->sc_dma field in it's softc is NULL, then tries to
* find the matching dma driver.
*
*/
sc->sc_esp = ((struct esp_softc *)
getdevunit("esp", sc->sc_dev.dv_unit));
/*
* and a back pointer to us, for DMA
*/
if (sc->sc_esp)
sc->sc_esp->sc_dma = sc;
printf(": rev ");
sc->sc_rev = sc->sc_regs->csr & D_DEV_ID;
switch (sc->sc_rev) {
case DMAREV_0:
printf("0");
break;
case DMAREV_1:
printf("1");
break;
case DMAREV_PLUS:
printf("1+");
break;
case DMAREV_2:
printf("2");
break;
default:
printf("unknown");
}
printf("\n");
/* indirect functions */
sc->enintr = dma_enintr;
sc->isintr = dma_isintr;
sc->reset = dma_reset;
sc->start = dma_start;
sc->intr = dmaintr;
sc->sc_node = ca->ca_ra.ra_node;
#if defined(SUN4C) || defined(SUN4M)
if (ca->ca_bustype == BUS_SBUS)
sbus_establish(&sc->sc_sd, &sc->sc_dev);
#endif /* SUN4C || SUN4M */
#ifdef notyet
/* return if we are a plain "dma" with no children */
if (strcmp(getpropstring(node, "name"), "dma") == 0)
return;
/* search through children */
for (node = firstchild(sc->sc_node); node; node = nextsibling(node)) {
name = getpropstring(node, "name");
if (!romprop(&ca->ca_ra, name, node))
continue;
base = (int)ca->ca_ra.ra_paddr;
if (SBUS_ABS(base)) {
ca->ca_slot = SBUS_ABS_TO_SLOT(base);
ca->ca_offset = SBUS_ABS_TO_OFFSET(base);
} else {
ca->ca_slot = slot = ca->ca_ra.ra_iospace;
ca->ca_offset = base;
ca->ca_ra.ra_paddr = (void *)SBUS_ADDR(slot, base);
}
(void) config_found(&sc->sc_dev, (void *)&ca, dmaprint);
}
#endif
}
void
dma_reset(sc)
struct dma_softc *sc;
{
DMAWAIT1(sc); /* let things drain */
DMACSR(sc) |= D_RESET; /* reset DMA */
DELAY(200); /* what should this be ? */
DMACSR(sc) &= ~D_RESET; /* de-assert reset line */
DMACSR(sc) |= D_INT_EN; /* enable interrupts */
if (sc->sc_rev > DMAREV_1)
DMACSR(sc) |= D_FASTER;
sc->sc_active = 0; /* and of course we aren't */
}
void
dma_enintr(sc)
struct dma_softc *sc;
{
sc->sc_regs->csr |= D_INT_EN;
}
int
dma_isintr(sc)
struct dma_softc *sc;
{
return (sc->sc_regs->csr & (D_INT_PEND|D_ERR_PEND));
}
#define ESPMAX ((sc->sc_esp->sc_rev > ESP100A) ? \
(16 * 1024 * 1024) : (64 * 1024))
#define DMAMAX(a) (0x01000000 - ((a) & 0x00ffffff))
/*
* start a dma transfer or keep it going
*/
void
dma_start(sc, addr, len, datain)
struct dma_softc *sc;
caddr_t *addr;
size_t *len;
int datain;
{
/* we do the loading of the transfer counter */
volatile caddr_t esp = sc->sc_esp->sc_reg;
int size;
sc->sc_dmaaddr = addr;
sc->sc_dmalen = len;
#if ESP_DEBUG
printf("%s: start %d@0x%08x,%d\n", sc->sc_dev.dv_xname, *sc->sc_dmalen,
*sc->sc_dmaaddr, datain ? 1 : 0);
#endif
/*
* the rules say we cannot transfer more than the limit
* of this DMA chip (64k for old and 16Mb for new),
* and we cannot cross a 16Mb boundary.
*/
size = min(*sc->sc_dmalen, ESPMAX);
size = min(size, DMAMAX((size_t) *sc->sc_dmaaddr));
sc->sc_dmasize = size;
#if ESP_DEBUG
printf("dma_start: dmasize = %d\n", sc->sc_dmasize);
#endif
esp[ESP_TCL] = size;
esp[ESP_TCM] = size >> 8;
if (sc->sc_esp->sc_rev > ESP100A) {
esp[ESP_TCH] = size >> 16;
}
/* load the count in */
ESPCMD(sc->sc_esp, ESPCMD_NOP|ESPCMD_DMA);
DMAWAIT1(sc);
/* clear errors and D_TC flag */
DMACSR(sc) |= D_INVALIDATE;
DMAWAIT1(sc);
DMADDR(sc) = *sc->sc_dmaaddr;
DMACSR(sc) |= datain|D_EN_DMA|D_INT_EN;
/* and clear from last read if this is a write */
if (!datain)
DMACSR(sc) &= ~D_WRITE;
/* and kick the SCSI */
ESPCMD(sc->sc_esp, ESPCMD_TRANS|ESPCMD_DMA);
sc->sc_active = 1;
}
/*
* Pseudo (chained) interrupt from the esp driver to kick the
* current running DMA transfer. I am replying on espintr() to
* pickup and clean errors for now
*
* return 1 if it was a DMA continue.
*/
int
dmaintr(sc)
struct dma_softc *sc;
{
volatile caddr_t esp = sc->sc_esp->sc_reg;
int trans = 0, resid = 0;
#if ESP_DEBUG
printf("%s: intr\n", sc->sc_dev.dv_xname);
#endif
if (DMACSR(sc) & D_ERR_PEND) {
printf("%s: error", sc->sc_dev.dv_xname);
DMACSR(sc) |= D_INVALIDATE;
return 0;
}
/* This is an "assertion" :) */
if (sc->sc_active == 0)
panic("dmaintr: DMA wasn't active");
/* DMA has stopped */
DMACSR(sc) &= ~D_EN_DMA;
sc->sc_active = 0;
if (!(DMACSR(sc) & D_WRITE) &&
(resid = (esp[ESP_FFLAG] & ESPFIFO_FF)) != 0) {
printf("empty FIFO of %d ", resid);
ESPCMD(sc->sc_esp, ESPCMD_FLUSH);
DELAY(1);
}
resid += esp[ESP_TCL] | (esp[ESP_TCM] << 8) |
(sc->sc_esp->sc_rev > ESP100A ? (esp[ESP_TCH] << 16) : 0);
trans = sc->sc_dmasize - resid;
if (trans < 0) { /* transferred < 0 ? */
printf("%s: xfer (%d) > req (%d)\n",
sc->sc_dev.dv_xname, trans, sc->sc_dmasize);
trans = sc->sc_dmasize;
}
#if ESP_DEBUG
printf("dmaintr: tcl=%d, tcm=%ds, tch=%d\n", esp[ESP_TCL],
esp[ESP_TCM], esp[ESP_TCH]);
printf("dmaintr: resid=%d, trans=%d\n", resid, trans);
#endif
if (DMACSR(sc) & D_WRITE)
cache_flush(*sc->sc_dmaaddr, trans);
*sc->sc_dmalen -= trans;
*sc->sc_dmaaddr += trans;
if (*sc->sc_dmalen == 0 ||
sc->sc_esp->sc_phase != sc->sc_esp->sc_prevphase)
return 0;
/* and again */
dma_start(sc, sc->sc_dmaaddr, sc->sc_dmalen, DMACSR(sc) & D_WRITE);
return 1;
}