hpcdma.c revision 1.1
1 /* $NetBSD: hpcdma.c,v 1.1 2001/08/19 03:16:21 wdk Exp $ */ 2 3 /* 4 * Copyright (c) 2001 Wayne Knowles 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Wayne Knowles 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/device.h> 42 #include <sys/buf.h> 43 44 #include <machine/bus.h> 45 46 #include <sgimips/hpc/hpcvar.h> 47 #include <sgimips/hpc/hpcreg.h> 48 #include <sgimips/hpc/hpcdma.h> 49 50 /* 51 * Allocate DMA Chain descriptor list 52 * 53 * XXX: Need to place in device tree 54 */ 55 void 56 hpcdma_init(haa, sc, ndesc) 57 struct hpc_attach_args *haa; 58 struct hpc_dma_softc *sc; 59 int ndesc; 60 { 61 bus_dma_segment_t seg; 62 struct hpc_dma_desc *hdd; 63 int rseg, allocsz; 64 65 sc->sc_bst = haa->ha_iot; 66 sc->sc_bsh = haa->ha_ioh; 67 sc->sc_dmat = haa->ha_dmat; 68 sc->sc_ndesc = ndesc; 69 sc->sc_flags = 0; 70 71 /* Alloc 1 additional descriptor - needed for DMA bug fix */ 72 allocsz = sizeof(struct hpc_dma_desc) * (ndesc + 1); 73 KASSERT(allocsz <= NBPG); 74 75 if (bus_dmamap_create(sc->sc_dmat, NBPG, 1 /*seg*/, 76 NBPG, 0, BUS_DMA_WAITOK, 77 &sc->sc_dmamap) != 0) { 78 printf(": failed to create dmamap\n"); 79 return; 80 } 81 82 /* 83 * Allocate a block of memory for dma chaining pointers 84 */ 85 if (bus_dmamem_alloc(sc->sc_dmat, allocsz, 0, 0, 86 &seg, 1, &rseg, BUS_DMA_NOWAIT)) { 87 printf(": can't allocate sglist\n"); 88 return; 89 } 90 /* Map pages into kernel memory */ 91 if (bus_dmamem_map(sc->sc_dmat, &seg, rseg, allocsz, 92 (caddr_t *)&hdd, BUS_DMA_NOWAIT)) { 93 printf(": can't map sglist\n"); 94 bus_dmamem_free(sc->sc_dmat, &seg, rseg); 95 return; 96 } 97 98 if (bus_dmamap_load(sc->sc_dmat, sc->sc_dmamap, hdd, 99 allocsz, NULL, BUS_DMA_NOWAIT)) { 100 printf(": can't load sglist\n"); 101 return; 102 } 103 104 sc->sc_desc_kva = hdd; 105 sc->sc_desc_pa = (void *) sc->sc_dmamap->dm_segs[0].ds_addr; 106 } 107 108 109 void 110 hpcdma_sglist_create(sc, dmamap) 111 struct hpc_dma_softc *sc; 112 bus_dmamap_t dmamap; 113 { 114 struct hpc_dma_desc *hva, *hpa; 115 bus_dma_segment_t *segp; 116 int i; 117 118 KASSERT(dmamap->dm_nsegs <= sc->sc_ndesc); 119 120 hva = sc->sc_desc_kva; 121 hpa = sc->sc_desc_pa; 122 segp = dmamap->dm_segs; 123 124 #ifdef DMA_DEBUG 125 printf("DMA_SGLIST<"); 126 #endif 127 for (i = dmamap->dm_nsegs; i; i--) { 128 #ifdef DMA_DEBUG 129 printf("%p:%ld, ", (void *)segp->ds_addr, segp->ds_len); 130 #endif 131 hva->hdd_bufptr = segp->ds_addr; 132 hva->hdd_ctl = segp->ds_len; 133 hva->hdd_descptr = (u_int32_t) ++hpa; 134 ++hva; ++segp; 135 } 136 /* Work around HPC3 DMA bug */ 137 hva->hdd_bufptr = 0; 138 hva->hdd_ctl = HDD_CTL_EOCHAIN; 139 hva->hdd_descptr = 0; 140 hva++; 141 #ifdef DMA_DEBUG 142 printf(">\n"); 143 #endif 144 bus_dmamap_sync(sc->sc_dmat, sc->sc_dmamap, 145 0, sc->sc_dmamap->dm_mapsize, 146 BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); 147 148 /* Load DMA Descriptor list */ 149 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_NDBP, 150 (u_int32_t)sc->sc_desc_pa); 151 } 152 153 void 154 hpcdma_cntl(sc, mode) 155 struct hpc_dma_softc *sc; 156 u_int32_t mode; 157 { 158 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, mode); 159 } 160 161 void 162 hpcdma_flush(sc) 163 struct hpc_dma_softc *sc; 164 { 165 u_int32_t mode; 166 167 mode = bus_space_read_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL); 168 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 169 mode | HPC_DMACTL_FLUSH); 170 171 /* Wait for Active bit to drop */ 172 while (bus_space_read_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL) & 173 HPC_DMACTL_ACTIVE) { 174 bus_space_barrier(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 4, 175 BUS_SPACE_BARRIER_READ); 176 } 177 } 178
Indexes created Thu Oct 02 01:09:59 GMT 2025