/* $NetBSD: dma.c,v 1.44 1997/06/26 00:31:20 thorpej Exp $ */ /* * Copyright (c) 1994 Paul Kranenburg. All rights reserved. * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int dmaprint __P((void *, const char *)); void dmaattach __P((struct device *, struct device *, void *)); int dmamatch __P((struct device *, struct cfdata *, void *)); void dma_reset __P((struct dma_softc *, int)); void espdma_reset __P((struct dma_softc *)); void ledma_reset __P((struct dma_softc *)); void dma_enintr __P((struct dma_softc *)); int dma_isintr __P((struct dma_softc *)); int espdmaintr __P((struct dma_softc *)); int ledmaintr __P((struct dma_softc *)); int dma_setup __P((struct dma_softc *, caddr_t *, size_t *, int, size_t *)); void dma_go __P((struct dma_softc *)); struct cfattach dma_ca = { sizeof(struct dma_softc), dmamatch, dmaattach }; struct cfdriver dma_cd = { NULL, "dma", DV_DULL }; struct cfattach ledma_ca = { sizeof(struct dma_softc), matchbyname, dmaattach }; struct cfdriver ledma_cd = { NULL, "ledma", DV_DULL }; int dmaprint(aux, name) void *aux; const char *name; { register struct confargs *ca = aux; if (name) printf("[%s at %s]", ca->ca_ra.ra_name, name); printf(" slot 0x%x offset 0x%x", ca->ca_slot, ca->ca_offset); return (UNCONF); } int dmamatch(parent, cf, aux) struct device *parent; struct cfdata *cf; void *aux; { register struct confargs *ca = aux; register struct romaux *ra = &ca->ca_ra; if (strcmp(cf->cf_driver->cd_name, ra->ra_name) && strcmp("espdma", ra->ra_name)) return (0); if (ca->ca_bustype == BUS_SBUS) return (1); ra->ra_len = NBPG; return (probeget(ra->ra_vaddr, 4) != -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; #if defined(SUN4C) || defined(SUN4M) int node; struct confargs oca; char *name; #endif if (ca->ca_ra.ra_vaddr == NULL || ca->ca_ra.ra_nvaddrs == 0) ca->ca_ra.ra_vaddr = mapiodev(ca->ca_ra.ra_reg, 0, ca->ca_ra.ra_len); sc->sc_regs = (struct dma_regs *) ca->ca_ra.ra_vaddr; /* * If we're a ledma, check to see what cable type is currently * active and set the appropriate bit in the ledma csr so that * it gets used. If we didn't netboot, the PROM won't have the * "cable-selection" property; default to TP and then the user * can change it via a "link0" option to ifconfig. */ if (strcmp(ca->ca_ra.ra_name, "ledma") == 0) { char *cabletype = getpropstring(ca->ca_ra.ra_node, "cable-selection"); if (strcmp(cabletype, "tpe") == 0) { sc->sc_regs->csr |= DE_AUI_TP; } else if (strcmp(cabletype, "aui") == 0) { sc->sc_regs->csr &= ~DE_AUI_TP; } else { /* assume TP if nothing there */ sc->sc_regs->csr |= DE_AUI_TP; } delay(20000); /* manual says we need 20ms delay */ } /* * Get transfer burst size from PROM and plug it into the * controller registers. This is needed on the Sun4m; do * others need it too? */ if (CPU_ISSUN4M) { int sbusburst = ((struct sbus_softc *)parent)->sc_burst; if (sbusburst == 0) sbusburst = SBUS_BURST_32 - 1; /* 1->16 */ sc->sc_burst = getpropint(ca->ca_ra.ra_node,"burst-sizes", -1); if (sc->sc_burst == -1) /* take SBus burst sizes */ sc->sc_burst = sbusburst; /* Clamp at parent's burst sizes */ sc->sc_burst &= sbusburst; } printf(": rev "); sc->sc_rev = sc->sc_regs->csr & D_DEV_ID; switch (sc->sc_rev) { case DMAREV_0: printf("0"); break; case DMAREV_ESC: printf("esc"); break; case DMAREV_1: printf("1"); break; case DMAREV_PLUS: printf("1+"); break; case DMAREV_2: printf("2"); break; default: printf("unknown (0x%x)", sc->sc_rev); } printf("\n"); /* indirect functions */ if (sc->sc_dev.dv_cfdata->cf_attach == &dma_ca) { sc->reset = espdma_reset; sc->intr = espdmaintr; } else { sc->reset = ledma_reset; sc->intr = ledmaintr; } sc->enintr = dma_enintr; sc->isintr = dma_isintr; sc->setup = dma_setup; sc->go = dma_go; sc->sc_node = ca->ca_ra.ra_node; if (CPU_ISSUN4) goto espsearch; #if defined(SUN4C) || defined(SUN4M) if (ca->ca_bustype == BUS_SBUS) sbus_establish(&sc->sc_sd, &sc->sc_dev); /* Propagate bootpath */ if (ca->ca_ra.ra_bp != NULL && (strcmp(ca->ca_ra.ra_bp->name, "espdma") == 0 || strcmp(ca->ca_ra.ra_bp->name, "dma") == 0 || strcmp(ca->ca_ra.ra_bp->name, "ledma") == 0)) oca.ca_ra.ra_bp = ca->ca_ra.ra_bp + 1; else oca.ca_ra.ra_bp = NULL; /* search through children */ node = firstchild(sc->sc_node); if (node != 0) do { name = getpropstring(node, "name"); if (!romprop(&oca.ca_ra, name, node)) continue; sbus_translate(parent, &oca); oca.ca_bustype = BUS_SBUS; (void) config_found(&sc->sc_dev, (void *)&oca, dmaprint); } while ((node = nextsibling(node)) != 0); else #endif /* SUN4C || SUN4M */ if (strcmp(ca->ca_ra.ra_name, "dma") == 0) { espsearch: /* * 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; } } #define DMAWAIT(SC, COND, MSG, DONTPANIC) do if (COND) { \ int count = 500000; \ while ((COND) && --count > 0) DELAY(1); \ if (count == 0) { \ printf("%s: line %d: CSR = %lx\n", __FILE__, __LINE__, \ (SC)->sc_regs->csr); \ if (DONTPANIC) \ printf(MSG); \ else \ panic(MSG); \ } \ } while (0) #define DMA_DRAIN(sc, dontpanic) do { \ /* \ * DMA rev0 & rev1: we are not allowed to touch the DMA "flush" \ * and "drain" bits while it is still thinking about a \ * request. \ * other revs: D_R_PEND bit reads as 0 \ */ \ DMAWAIT(sc, sc->sc_regs->csr & D_R_PEND, "R_PEND", dontpanic); \ /* \ * Select drain bit based on revision \ * also clears errors and D_TC flag \ */ \ if (sc->sc_rev == DMAREV_1 || sc->sc_rev == DMAREV_0) \ DMACSR(sc) |= D_DRAIN; \ else \ DMACSR(sc) |= D_INVALIDATE; \ /* \ * Wait for draining to finish \ * rev0 & rev1 call this PACKCNT \ */ \ DMAWAIT(sc, sc->sc_regs->csr & D_DRAINING, "DRAINING", dontpanic);\ } while(0) void dma_reset(sc, isledma) struct dma_softc *sc; int isledma; { DMA_DRAIN(sc, 1); DMACSR(sc) &= ~D_EN_DMA; /* Stop DMA */ DMACSR(sc) |= D_RESET; /* reset DMA */ DELAY(200); /* what should this be ? */ /*DMAWAIT1(sc); why was this here? */ DMACSR(sc) &= ~D_RESET; /* de-assert reset line */ DMACSR(sc) |= D_INT_EN; /* enable interrupts */ if (sc->sc_rev > DMAREV_1 && isledma == 0) DMACSR(sc) |= D_FASTER; switch (sc->sc_rev) { case DMAREV_2: sc->sc_regs->csr &= ~D_BURST_SIZE; /* must clear first */ if (sc->sc_burst & SBUS_BURST_32) { DMACSR(sc) |= D_BURST_32; } else if (sc->sc_burst & SBUS_BURST_16) { DMACSR(sc) |= D_BURST_16; } else { DMACSR(sc) |= D_BURST_0; } break; case DMAREV_ESC: DMACSR(sc) |= D_AUTODRAIN; /* Auto-drain */ if (sc->sc_burst & SBUS_BURST_32) { DMACSR(sc) &= ~0x800; } else DMACSR(sc) |= 0x800; break; default: } sc->sc_active = 0; /* and of course we aren't */ } void espdma_reset(sc) struct dma_softc *sc; { dma_reset(sc, 0); } void ledma_reset(sc) struct dma_softc *sc; { dma_reset(sc, 1); } 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 DMAMAX(a) (0x01000000 - ((a) & 0x00ffffff)) /* * setup a dma transfer */ int dma_setup(sc, addr, len, datain, dmasize) struct dma_softc *sc; caddr_t *addr; size_t *len; int datain; size_t *dmasize; /* IN-OUT */ { u_long csr; DMA_DRAIN(sc, 0); #if 0 DMACSR(sc) &= ~D_INT_EN; #endif sc->sc_dmaaddr = addr; sc->sc_dmalen = len; NCR_DMA(("%s: start %d@%p,%d\n", sc->sc_dev.dv_xname, *sc->sc_dmalen, *sc->sc_dmaaddr, datain ? 1 : 0)); /* * 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. */ *dmasize = sc->sc_dmasize = min(*dmasize, DMAMAX((size_t) *sc->sc_dmaaddr)); NCR_DMA(("dma_setup: dmasize = %d\n", sc->sc_dmasize)); /* Program the DMA address */ if (CPU_ISSUN4M && sc->sc_dmasize) { /* * Use dvma mapin routines to map the buffer into DVMA space. */ sc->sc_dvmaaddr = *sc->sc_dmaaddr; sc->sc_dvmakaddr = kdvma_mapin(sc->sc_dvmaaddr, sc->sc_dmasize, 0); if (sc->sc_dvmakaddr == NULL) panic("dma: cannot allocate DVMA address"); DMADDR(sc) = sc->sc_dvmakaddr; } else DMADDR(sc) = *sc->sc_dmaaddr; if (sc->sc_rev == DMAREV_ESC) { /* DMA ESC chip bug work-around */ register long bcnt = sc->sc_dmasize; register long eaddr = bcnt + (long)*sc->sc_dmaaddr; if ((eaddr & PGOFSET) != 0) bcnt = roundup(bcnt, NBPG); DMACNT(sc) = bcnt; } /* Setup DMA control register */ csr = DMACSR(sc); if (datain) csr |= D_WRITE; else csr &= ~D_WRITE; csr |= D_INT_EN; DMACSR(sc) = csr; return 0; } void dma_go(sc) struct dma_softc *sc; { /* Start DMA */ DMACSR(sc) |= D_EN_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 espdmaintr(sc) struct dma_softc *sc; { struct ncr53c9x_softc *nsc = &sc->sc_esp->sc_ncr53c9x; char bits[64]; int trans, resid; u_long csr; csr = DMACSR(sc); NCR_DMA(("%s: intr: addr %p, csr %s\n", sc->sc_dev.dv_xname, DMADDR(sc), bitmask_snprintf(csr, DMACSRBITS, bits, sizeof(bits)))); if (csr & D_ERR_PEND) { DMACSR(sc) &= ~D_EN_DMA; /* Stop DMA */ DMACSR(sc) |= D_INVALIDATE; printf("%s: error: csr=%s\n", sc->sc_dev.dv_xname, bitmask_snprintf(csr, DMACSRBITS, bits, sizeof(bits))); return -1; } /* This is an "assertion" :) */ if (sc->sc_active == 0) panic("dmaintr: DMA wasn't active"); DMA_DRAIN(sc, 0); /* DMA has stopped */ DMACSR(sc) &= ~D_EN_DMA; sc->sc_active = 0; if (sc->sc_dmasize == 0) { /* A "Transfer Pad" operation completed */ NCR_DMA(("dmaintr: discarded %d bytes (tcl=%d, tcm=%d)\n", NCR_READ_REG(nsc, NCR_TCL) | (NCR_READ_REG(nsc, NCR_TCM) << 8), NCR_READ_REG(nsc, NCR_TCL), NCR_READ_REG(nsc, NCR_TCM))); return 0; } resid = 0; /* * If a transfer onto the SCSI bus gets interrupted by the device * (e.g. for a SAVEPOINTER message), the data in the FIFO counts * as residual since the ESP counter registers get decremented as * bytes are clocked into the FIFO. */ if (!(csr & D_WRITE) && (resid = (NCR_READ_REG(nsc, NCR_FFLAG) & NCRFIFO_FF)) != 0) { NCR_DMA(("dmaintr: empty esp FIFO of %d ", resid)); } if ((nsc->sc_espstat & NCRSTAT_TC) == 0) { /* * `Terminal count' is off, so read the residue * out of the ESP counter registers. */ resid += (NCR_READ_REG(nsc, NCR_TCL) | (NCR_READ_REG(nsc, NCR_TCM) << 8) | ((nsc->sc_cfg2 & NCRCFG2_FE) ? (NCR_READ_REG(nsc, NCR_TCH) << 16) : 0)); if (resid == 0 && sc->sc_dmasize == 65536 && (nsc->sc_cfg2 & NCRCFG2_FE) == 0) /* A transfer of 64K is encoded as `TCL=TCM=0' */ resid = 65536; } trans = sc->sc_dmasize - resid; if (trans < 0) { /* transferred < 0 ? */ #if 0 /* * This situation can happen in perfectly normal operation * if the ESP is reselected while using DMA to select * another target. As such, don't print the warning. */ printf("%s: xfer (%d) > req (%d)\n", sc->sc_dev.dv_xname, trans, sc->sc_dmasize); #endif trans = sc->sc_dmasize; } NCR_DMA(("dmaintr: tcl=%d, tcm=%d, tch=%d; trans=%d, resid=%d\n", NCR_READ_REG(nsc, NCR_TCL), NCR_READ_REG(nsc, NCR_TCM), (nsc->sc_cfg2 & NCRCFG2_FE) ? NCR_READ_REG(nsc, NCR_TCH) : 0, trans, resid)); if (csr & D_WRITE) cpuinfo.cache_flush(*sc->sc_dmaaddr, trans); if (CPU_ISSUN4M && sc->sc_dvmakaddr) dvma_mapout((vm_offset_t)sc->sc_dvmakaddr, (vm_offset_t)sc->sc_dvmaaddr, sc->sc_dmasize); *sc->sc_dmalen -= trans; *sc->sc_dmaaddr += trans; #if 0 /* this is not normal operation just yet */ if (*sc->sc_dmalen == 0 || nsc->sc_phase != nsc->sc_prevphase) return 0; /* and again */ dma_start(sc, sc->sc_dmaaddr, sc->sc_dmalen, DMACSR(sc) & D_WRITE); return 1; #endif return 0; } /* * Pseudo (chained) interrupt from the le driver to handle DMA * errors. * * XXX: untested */ int ledmaintr(sc) struct dma_softc *sc; { char bits[64]; u_long csr; csr = DMACSR(sc); if (csr & D_ERR_PEND) { DMACSR(sc) &= ~D_EN_DMA; /* Stop DMA */ DMACSR(sc) |= D_INVALIDATE; printf("%s: error: csr=%s\n", sc->sc_dev.dv_xname, bitmask_snprintf(csr, DMACSRBITS, bits, sizeof(bits))); DMA_RESET(sc); } return 1; }