/*- * Copyright (c) 2004 Scott Long * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. * */ /* $NetBSD: lsi64854.c,v 1.25 2005/02/27 00:27:02 perry Exp $ */ /*- * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Paul Kranenburg. * * 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 the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``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 FOUNDATION OR CONTRIBUTORS * 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 __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include void lsi64854_reset(struct lsi64854_softc *); int lsi64854_setup(struct lsi64854_softc *, caddr_t *, size_t *, int, size_t *); int lsi64854_setup_pp(struct lsi64854_softc *, caddr_t *, size_t *, int, size_t *); #ifdef DEBUG #define LDB_SCSI 1 #define LDB_ENET 2 #define LDB_PP 4 #define LDB_ANY 0xff int lsi64854debug = 0; #define DPRINTF(a,x) do { if (lsi64854debug & (a)) printf x ; } while (0) #else #define DPRINTF(a,x) #endif #define MAX_DMA_SZ (16*1024*1024) /* * Finish attaching this DMA device. * Front-end must fill in these fields: * sc_regs * sc_burst * sc_channel (one of SCSI, ENET, PP) * sc_client (one of SCSI, ENET, PP `soft_c' pointers) */ int lsi64854_attach(struct lsi64854_softc *sc) { uint32_t csr; int error; /* Indirect functions */ switch (sc->sc_channel) { case L64854_CHANNEL_SCSI: sc->intr = lsi64854_scsi_intr; sc->setup = lsi64854_setup; break; case L64854_CHANNEL_ENET: sc->intr = lsi64854_enet_intr; break; case L64854_CHANNEL_PP: sc->setup = lsi64854_setup_pp; break; default: device_printf(sc->sc_dev, "unknown channel\n"); } sc->reset = lsi64854_reset; /* Allocate a dmamap */ error = bus_dma_tag_create( sc->sc_parent_dmat, /* parent */ 1, 0, /* alignment, boundary */ BUS_SPACE_MAXADDR, /* lowaddr */ BUS_SPACE_MAXADDR, /* highaddr */ NULL, NULL, /* filter, filterarg */ MAX_DMA_SZ, /* maxsize */ 1, /* nsegments */ MAX_DMA_SZ, /* maxsegsize */ BUS_DMA_ALLOCNOW, /* flags */ NULL, NULL, /* lockfunc, lockarg */ &sc->sc_buffer_dmat); if (error != 0) { device_printf(sc->sc_dev, "cannot allocate buffer DMA tag\n"); return (error); } error = bus_dmamap_create(sc->sc_buffer_dmat, 0, &sc->sc_dmamap); if (error != 0) { device_printf(sc->sc_dev, "DMA map create failed\n"); bus_dma_tag_destroy(sc->sc_buffer_dmat); return (error); } csr = L64854_GCSR(sc); sc->sc_rev = csr & L64854_DEVID; if (sc->sc_rev == DMAREV_HME) return (0); device_printf(sc->sc_dev, "DMA rev. "); 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); } DPRINTF(LDB_ANY, (", burst 0x%x, csr 0x%x", sc->sc_burst, csr)); printf("\n"); return (0); } int lsi64854_detach(struct lsi64854_softc *sc) { if (sc->setup) bus_dmamap_unload(sc->sc_buffer_dmat, sc->sc_dmamap); bus_dmamap_destroy(sc->sc_buffer_dmat, sc->sc_dmamap); bus_dma_tag_destroy(sc->sc_buffer_dmat); return (0); } /* * DMAWAIT waits while condition is true */ #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 = 0x%lx\n", __FILE__, __LINE__, \ (u_long)L64854_GCSR(SC)); \ if (DONTPANIC) \ printf(MSG); \ else \ panic(MSG); \ } \ } while (0) #define DMA_DRAIN(sc, dontpanic) do { \ uint32_t csr; \ /* \ * 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_ESC_R_PEND bit reads as 0 \ */ \ DMAWAIT(sc, L64854_GCSR(sc) & D_ESC_R_PEND, "R_PEND", dontpanic);\ if (sc->sc_rev != DMAREV_HME) { \ /* \ * Select drain bit based on revision \ * also clears errors and D_TC flag \ */ \ csr = L64854_GCSR(sc); \ if (sc->sc_rev == DMAREV_1 || sc->sc_rev == DMAREV_0) \ csr |= D_ESC_DRAIN; \ else \ csr |= L64854_INVALIDATE; \ \ L64854_SCSR(sc,csr); \ } \ /* \ * Wait for draining to finish \ * rev0 & rev1 call this PACKCNT \ */ \ DMAWAIT(sc, L64854_GCSR(sc) & L64854_DRAINING, "DRAINING", dontpanic);\ } while(0) #define DMA_FLUSH(sc, dontpanic) do { \ uint32_t csr; \ /* \ * 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_ESC_R_PEND bit reads as 0 \ */ \ DMAWAIT(sc, L64854_GCSR(sc) & D_ESC_R_PEND, "R_PEND", dontpanic);\ csr = L64854_GCSR(sc); \ csr &= ~(L64854_WRITE|L64854_EN_DMA); /* no-ops on ENET */ \ csr |= L64854_INVALIDATE; /* XXX FAS ? */ \ L64854_SCSR(sc,csr); \ } while(0) void lsi64854_reset(struct lsi64854_softc *sc) { uint32_t csr; DMA_FLUSH(sc, 1); csr = L64854_GCSR(sc); DPRINTF(LDB_ANY, ("%s: csr 0x%x\n", __func__, csr)); /* * XXX is sync needed? if (sc->sc_dmamap->dm_nsegs > 0) bus_dmamap_unload(sc->sc_buffer_dmat, sc->sc_dmamap); */ if (sc->sc_rev == DMAREV_HME) L64854_SCSR(sc, csr | D_HW_RESET_FAS366); csr |= L64854_RESET; /* reset DMA */ L64854_SCSR(sc, csr); DELAY(200); /* > 10 Sbus clocks(?) */ /*DMAWAIT1(sc); why was this here? */ csr = L64854_GCSR(sc); csr &= ~L64854_RESET; /* de-assert reset line */ L64854_SCSR(sc, csr); DELAY(5); /* allow a few ticks to settle */ csr = L64854_GCSR(sc); csr |= L64854_INT_EN; /* enable interrupts */ if (sc->sc_rev > DMAREV_1 && sc->sc_channel == L64854_CHANNEL_SCSI) { if (sc->sc_rev == DMAREV_HME) csr |= D_TWO_CYCLE; else csr |= D_FASTER; } /* Set burst */ switch (sc->sc_rev) { case DMAREV_HME: case DMAREV_2: csr &= ~L64854_BURST_SIZE; if (sc->sc_burst == 32) csr |= L64854_BURST_32; else if (sc->sc_burst == 16) csr |= L64854_BURST_16; else csr |= L64854_BURST_0; break; case DMAREV_ESC: csr |= D_ESC_AUTODRAIN; /* Auto-drain */ if (sc->sc_burst == 32) csr &= ~D_ESC_BURST; else csr |= D_ESC_BURST; break; default: break; } L64854_SCSR(sc, csr); if (sc->sc_rev == DMAREV_HME) { bus_space_write_4(sc->sc_regt, sc->sc_regh, L64854_REG_ADDR, 0); sc->sc_dmactl = csr; } sc->sc_active = 0; DPRINTF(LDB_ANY, ("%s: done, csr 0x%x\n", __func__, csr)); } static void lsi64854_map_scsi(void *arg, bus_dma_segment_t *segs, int nseg, int error) { struct lsi64854_softc *sc; sc = (struct lsi64854_softc *)arg; if (nseg != 1) panic("%s: cannot map %d segments\n", __func__, nseg); bus_dmamap_sync(sc->sc_buffer_dmat, sc->sc_dmamap, sc->sc_datain ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); bus_space_write_4(sc->sc_regt, sc->sc_regh, L64854_REG_ADDR, segs[0].ds_addr); } #define DMAMAX(a) (MAX_DMA_SZ - ((a) & (MAX_DMA_SZ-1))) /* * setup a DMA transfer */ int lsi64854_setup(struct lsi64854_softc *sc, caddr_t *addr, size_t *len, int datain, size_t *dmasize) { uint32_t csr; DMA_FLUSH(sc, 0); #if 0 DMACSR(sc) &= ~D_INT_EN; #endif sc->sc_dmaaddr = addr; sc->sc_dmalen = len; sc->sc_datain = datain; /* * 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 = ulmin(*dmasize, DMAMAX((size_t) *sc->sc_dmaaddr)); DPRINTF(LDB_ANY, ("%s: dmasize=%ld\n", __func__, (long)sc->sc_dmasize)); /* * XXX what length? */ if (sc->sc_rev == DMAREV_HME) { L64854_SCSR(sc, sc->sc_dmactl | L64854_RESET); L64854_SCSR(sc, sc->sc_dmactl); bus_space_write_4(sc->sc_regt, sc->sc_regh, L64854_REG_CNT, *dmasize); } /* Program the DMA address */ if (sc->sc_dmasize) if (bus_dmamap_load(sc->sc_buffer_dmat, sc->sc_dmamap, *sc->sc_dmaaddr, sc->sc_dmasize, lsi64854_map_scsi, sc, 0)) panic("%s: cannot allocate DVMA address", __func__); if (sc->sc_rev == DMAREV_ESC) { /* DMA ESC chip bug work-around */ long bcnt = sc->sc_dmasize; long eaddr = bcnt + (long)*sc->sc_dmaaddr; if ((eaddr & PAGE_MASK_8K) != 0) bcnt = roundup(bcnt, PAGE_SIZE_8K); bus_space_write_4(sc->sc_regt, sc->sc_regh, L64854_REG_CNT, bcnt); } /* Setup DMA control register */ csr = L64854_GCSR(sc); if (datain) csr |= L64854_WRITE; else csr &= ~L64854_WRITE; csr |= L64854_INT_EN; if (sc->sc_rev == DMAREV_HME) csr |= (D_DSBL_SCSI_DRN | D_EN_DMA); L64854_SCSR(sc, csr); return (0); } /* * Pseudo (chained) interrupt from the esp driver to kick the * current running DMA transfer. Called from ncr53c9x_intr() * for now. * * return 1 if it was a DMA continue. */ int lsi64854_scsi_intr(void *arg) { struct lsi64854_softc *sc = arg; struct ncr53c9x_softc *nsc = sc->sc_client; int trans, resid; uint32_t csr; csr = L64854_GCSR(sc); DPRINTF(LDB_SCSI, ("%s: addr 0x%x, csr %b\n", __func__, bus_space_read_4(sc->sc_regt, sc->sc_regh, L64854_REG_ADDR), csr, DDMACSR_BITS)); if (csr & (D_ERR_PEND|D_SLAVE_ERR)) { device_printf(sc->sc_dev, "error: csr=%b\n", csr, DDMACSR_BITS); csr &= ~D_EN_DMA; /* Stop DMA */ /* Invalidate the queue; SLAVE_ERR bit is write-to-clear */ csr |= D_INVALIDATE|D_SLAVE_ERR; L64854_SCSR(sc, csr); return (-1); } /* This is an "assertion" :) */ if (sc->sc_active == 0) panic("%s: DMA wasn't active", __func__); DMA_DRAIN(sc, 0); /* DMA has stopped */ csr &= ~D_EN_DMA; L64854_SCSR(sc, csr); sc->sc_active = 0; if (sc->sc_dmasize == 0) { /* A "Transfer Pad" operation completed */ DPRINTF(LDB_SCSI, ("%s: discarded %d bytes (tcl=%d, tcm=%d)\n", __func__, 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 NCR53C9X 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) { DPRINTF(LDB_SCSI, ("%s: empty esp FIFO of %d ", __func__, resid)); if (nsc->sc_rev == NCR_VARIANT_FAS366 && (NCR_READ_REG(nsc, NCR_CFG3) & NCRFASCFG3_EWIDE)) resid <<= 1; } if ((nsc->sc_espstat & NCRSTAT_TC) == 0) { /* * `Terminal count' is off, so read the residue * out of the NCR53C9X 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) { /* transfered < 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. */ device_printf(sc->sc_dev, "xfer (%d) > req (%d)\n", trans, sc->sc_dmasize); #endif trans = sc->sc_dmasize; } DPRINTF(LDB_SCSI, ("%s: tcl=%d, tcm=%d, tch=%d; trans=%d, resid=%d\n", __func__, 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 0 /* XXX */ if (sc->sc_dmamap->dm_nsegs > 0) { bus_dmamap_sync(sc->sc_buffer_dmat, sc->sc_dmamap, (csr & D_WRITE) != 0 ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); bus_dmamap_unload(sc->sc_buffer_dmat, sc->sc_dmamap); } #endif *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 to le driver to handle DMA errors. */ int lsi64854_enet_intr(void *arg) { struct lsi64854_softc *sc = arg; uint32_t csr; static int dodrain = 0; int rv; csr = L64854_GCSR(sc); /* If the DMA logic shows an interrupt, claim it */ rv = ((csr & E_INT_PEND) != 0) ? 1 : 0; if (csr & (E_ERR_PEND|E_SLAVE_ERR)) { device_printf(sc->sc_dev, "error: csr=%b\n", csr, EDMACSR_BITS); csr &= ~L64854_EN_DMA; /* Stop DMA */ /* Invalidate the queue; SLAVE_ERR bit is write-to-clear */ csr |= E_INVALIDATE|E_SLAVE_ERR; L64854_SCSR(sc, csr); DMA_RESET(sc); dodrain = 1; return (1); } if (dodrain) { /* XXX - is this necessary with D_DSBL_WRINVAL on? */ int i = 10; csr |= E_DRAIN; L64854_SCSR(sc, csr); while (i-- > 0 && (L64854_GCSR(sc) & D_DRAINING)) DELAY(1); } (*sc->sc_intrchain)(sc->sc_intrchainarg); return (rv); } static void lsi64854_map_pp(void *arg, bus_dma_segment_t *segs, int nsegs, int error) { struct lsi64854_softc *sc; sc = (struct lsi64854_softc *)arg; if (nsegs != 1) panic("%s: cannot map %d segments\n", __func__, nsegs); bus_dmamap_sync(sc->sc_buffer_dmat, sc->sc_dmamap, sc->sc_datain ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); bus_space_write_4(sc->sc_regt, sc->sc_regh, L64854_REG_ADDR, segs[0].ds_addr); bus_space_write_4(sc->sc_regt, sc->sc_regh, L64854_REG_CNT, sc->sc_dmasize); } /* * setup a DMA transfer */ int lsi64854_setup_pp(struct lsi64854_softc *sc, caddr_t *addr, size_t *len, int datain, size_t *dmasize) { uint32_t csr; DMA_FLUSH(sc, 0); sc->sc_dmaaddr = addr; sc->sc_dmalen = len; sc->sc_datain = datain; DPRINTF(LDB_PP, ("%s: pp start %ld@%p,%d\n", __func__, (long)*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 = ulmin(*dmasize, DMAMAX((size_t) *sc->sc_dmaaddr)); DPRINTF(LDB_PP, ("%s: dmasize=%ld\n", __func__, (long)sc->sc_dmasize)); /* Program the DMA address */ if (sc->sc_dmasize) if (bus_dmamap_load(sc->sc_buffer_dmat, sc->sc_dmamap, *sc->sc_dmaaddr, sc->sc_dmasize, lsi64854_map_pp, sc, 0)) panic("%s: pp cannot allocate DVMA address", __func__); /* Setup DMA control register */ csr = L64854_GCSR(sc); csr &= ~L64854_BURST_SIZE; if (sc->sc_burst == 32) csr |= L64854_BURST_32; else if (sc->sc_burst == 16) csr |= L64854_BURST_16; else csr |= L64854_BURST_0; csr |= P_EN_DMA|P_INT_EN|P_EN_CNT; #if 0 /* This bit is read-only in PP csr register */ if (datain) csr |= P_WRITE; else csr &= ~P_WRITE; #endif L64854_SCSR(sc, csr); return (0); } /* * Parallel port DMA interrupt. */ int lsi64854_pp_intr(void *arg) { struct lsi64854_softc *sc = arg; int ret, trans, resid = 0; uint32_t csr; csr = L64854_GCSR(sc); DPRINTF(LDB_PP, ("%s: addr 0x%x, csr %b\n", __func__, bus_space_read_4(sc->sc_regt, sc->sc_regh, L64854_REG_ADDR), csr, PDMACSR_BITS)); if (csr & (P_ERR_PEND|P_SLAVE_ERR)) { resid = bus_space_read_4(sc->sc_regt, sc->sc_regh, L64854_REG_CNT); device_printf(sc->sc_dev, "error: resid %d csr=%b\n", resid, csr, PDMACSR_BITS); csr &= ~P_EN_DMA; /* Stop DMA */ /* Invalidate the queue; SLAVE_ERR bit is write-to-clear */ csr |= P_INVALIDATE|P_SLAVE_ERR; L64854_SCSR(sc, csr); return (1); } ret = (csr & P_INT_PEND) != 0; if (sc->sc_active != 0) { DMA_DRAIN(sc, 0); resid = bus_space_read_4(sc->sc_regt, sc->sc_regh, L64854_REG_CNT); } /* DMA has stopped */ csr &= ~D_EN_DMA; L64854_SCSR(sc, csr); sc->sc_active = 0; trans = sc->sc_dmasize - resid; if (trans < 0) /* transfered < 0? */ trans = sc->sc_dmasize; *sc->sc_dmalen -= trans; *sc->sc_dmaaddr += trans; #if 0 /* XXX */ if (sc->sc_dmamap->dm_nsegs > 0) { bus_dmamap_sync(sc->sc_buffer_dmat, sc->sc_dmamap, (csr & D_WRITE) != 0 ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); bus_dmamap_unload(sc->sc_buffer_dmat, sc->sc_dmamap); } #endif return (ret != 0); }