/* $NetBSD: dma.c,v 1.13 2002/10/02 16:02:25 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 #define MAX_DMA_SZ 0x01000000 /* 16MB */ static int dmamatch __P((struct device *, struct cfdata *, void *)); static void dmaattach __P((struct device *, struct device *, void *)); CFATTACH_DECL(dma, sizeof(struct dma_softc), dmamatch, dmaattach, NULL, NULL); extern struct cfdriver dma_cd; static int dmamatch(parent, cf, aux) struct device *parent; struct cfdata *cf; void *aux; { struct confargs *ca = aux; /* * Check for the DMA registers. */ if (bus_peek(ca->ca_bustype, ca->ca_paddr, 4) == -1) return (0); /* If default ipl, fill it in. */ if (ca->ca_intpri == -1) ca->ca_intpri = 2; return (1); } static void dmaattach(parent, self, aux) struct device *parent, *self; void *aux; { struct confargs *ca = aux; struct dma_softc *sc = (void *)self; int id; #if 0 /* indirect functions */ sc->intr = espdmaintr; sc->setup = dma_setup; sc->reset = dma_reset; #endif /* * Map in the registers. */ sc->sc_regs = bus_mapin(ca->ca_bustype, ca->ca_paddr, sizeof(struct dma_regs)); sc->sc_rev = DMACSR(sc) & D_DEV_ID; id = (sc->sc_rev >> 28) & 0xf; printf(": rev %d\n", id); /* * Make sure the DMA chip is supported revision. * The Sun3/80 used only the old rev zero chip, * so the initialization has been simplified. */ switch (sc->sc_rev) { case DMAREV_0: case DMAREV_1: break; default: panic("unsupported dma rev"); } } /* * This is called by espattach to get our softc. */ struct dma_softc * espdmafind(int unit) { if (unit < 0 || unit >= dma_cd.cd_ndevs || dma_cd.cd_devs[unit] == NULL) panic("no dma"); return (dma_cd.cd_devs[unit]); } #define DMAWAIT(SC, COND, MSG, DONTPANIC) do if (COND) { \ int count = 100000; \ while ((COND) && --count > 0) DELAY(5); \ if (count == 0) { \ printf("%s: line %d: CSR = 0x%x\n", \ __FILE__, __LINE__, DMACSR(SC)); \ 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, DMACSR(sc) & D_R_PEND, "R_PEND", dontpanic); \ /* \ * Select drain bit (always rev 0,1) \ * also clears errors and D_TC flag \ */ \ DMACSR(sc) |= D_DRAIN; \ /* \ * Wait for draining to finish \ */ \ DMAWAIT(sc, DMACSR(sc) & D_PACKCNT, "DRAINING", dontpanic); \ } while(0) #define DMA_FLUSH(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, DMACSR(sc) & D_R_PEND, "R_PEND", dontpanic); \ DMACSR(sc) &= ~(D_WRITE|D_EN_DMA); \ DMACSR(sc) |= D_FLUSH; \ } while(0) void dma_reset(sc) struct dma_softc *sc; { DMA_FLUSH(sc, 1); 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 */ DELAY(5); /* allow a few ticks to settle */ /* * Get transfer burst size from (?) and plug it into the * controller registers. This is needed on the Sun4m... * Do we need it too? Apparently not, because the 3/80 * always has the old, REV zero DMA chip. */ DMACSR(sc) |= D_INT_EN; /* enable interrupts */ sc->sc_active = 0; } #define DMAMAX(a) (MAX_DMA_SZ - ((a) & (MAX_DMA_SZ-1))) /* * 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_int32_t csr; DMA_FLUSH(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 (sc->sc_dmasize) { /* * Use dvma mapin routines to map the buffer into DVMA space. */ sc->sc_dvmaaddr = *sc->sc_dmaaddr; sc->sc_dvmakaddr = dvma_mapin(sc->sc_dvmaaddr, sc->sc_dmasize, 0); if (sc->sc_dvmakaddr == NULL) panic("dma: cannot allocate DVMA address"); sc->sc_dmasaddr = dvma_kvtopa(sc->sc_dvmakaddr, BUS_OBIO); DMADDR(sc) = sc->sc_dmasaddr; } else { /* XXX: What is this about? -gwr */ DMADDR(sc) = (u_int32_t) *sc->sc_dmaaddr; } /* We never have DMAREV_ESC. */ /* 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; } /* * Pseudo (chained) interrupt from the esp driver to kick the * current running DMA transfer. I am relying 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; char bits[64]; int trans, resid; u_int32_t csr; csr = DMACSR(sc); NCR_DMA(("%s: intr: addr 0x%x, 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_FLUSH; 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)); #ifdef SUN3X_470_EVENTUALLY if (csr & D_WRITE) cache_flush(*sc->sc_dmaaddr, trans); #endif if (sc->sc_dvmakaddr) dvma_mapout(sc->sc_dvmakaddr, 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; }