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