hpcdma.c revision 1.1.8.4
1 /* $NetBSD: hpcdma.c,v 1.1.8.4 2002/11/11 22:03:52 nathanw 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 /* 40 * Support for SCSI DMA provided by the HPC. 41 * 42 * Note: We use SCSI0 offsets, etc. here. Since the layout of SCSI0 43 * and SCSI1 are the same, this is no problem. 44 */ 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/device.h> 49 #include <sys/buf.h> 50 51 #include <machine/bus.h> 52 53 #include <sgimips/hpc/hpcvar.h> 54 #include <sgimips/hpc/hpcreg.h> 55 #include <sgimips/hpc/hpcdma.h> 56 57 /* 58 * Allocate DMA Chain descriptor list 59 */ 60 void 61 hpcdma_init(struct hpc_attach_args *haa, struct hpc_dma_softc *sc, int ndesc) 62 { 63 bus_dma_segment_t seg; 64 int rseg, allocsz; 65 66 sc->sc_bst = haa->ha_st; 67 sc->sc_dmat = haa->ha_dmat; 68 sc->sc_ndesc = ndesc; 69 sc->sc_flags = 0; 70 71 if (bus_space_subregion(haa->ha_st, haa->ha_sh, haa->ha_dmaoff, 72 HPC_SCSI0_REGS_SIZE, &sc->sc_bsh) != 0) { 73 printf(": can't map DMA registers\n"); 74 return; 75 } 76 77 /* Alloc 1 additional descriptor - needed for DMA bug fix */ 78 allocsz = sizeof(struct hpc_dma_desc) * (ndesc + 1); 79 KASSERT(allocsz <= NBPG); 80 81 if (bus_dmamap_create(sc->sc_dmat, NBPG, 1 /*seg*/, 82 NBPG, 0, BUS_DMA_WAITOK, 83 &sc->sc_dmamap) != 0) { 84 printf(": failed to create dmamap\n"); 85 return; 86 } 87 88 /* 89 * Allocate a block of memory for dma chaining pointers 90 */ 91 if (bus_dmamem_alloc(sc->sc_dmat, allocsz, 0, 0, 92 &seg, 1, &rseg, BUS_DMA_NOWAIT)) { 93 printf(": can't allocate sglist\n"); 94 return; 95 } 96 /* Map pages into kernel memory */ 97 if (bus_dmamem_map(sc->sc_dmat, &seg, rseg, allocsz, 98 (caddr_t *)&sc->sc_desc_kva, BUS_DMA_NOWAIT)) { 99 printf(": can't map sglist\n"); 100 bus_dmamem_free(sc->sc_dmat, &seg, rseg); 101 return; 102 } 103 104 if (bus_dmamap_load(sc->sc_dmat, sc->sc_dmamap, sc->sc_desc_kva, 105 allocsz, NULL, BUS_DMA_NOWAIT)) { 106 printf(": can't load sglist\n"); 107 return; 108 } 109 110 sc->sc_desc_pa = (void *) sc->sc_dmamap->dm_segs[0].ds_addr; 111 } 112 113 114 void 115 hpcdma_sglist_create(struct hpc_dma_softc *sc, bus_dmamap_t dmamap) 116 { 117 struct hpc_dma_desc *hva, *hpa; 118 bus_dma_segment_t *segp; 119 int i; 120 121 KASSERT(dmamap->dm_nsegs <= sc->sc_ndesc); 122 123 hva = sc->sc_desc_kva; 124 hpa = sc->sc_desc_pa; 125 segp = dmamap->dm_segs; 126 127 #ifdef DMA_DEBUG 128 printf("DMA_SGLIST<"); 129 #endif 130 for (i = dmamap->dm_nsegs; i; i--) { 131 #ifdef DMA_DEBUG 132 printf("%p:%ld, ", (void *)segp->ds_addr, segp->ds_len); 133 #endif 134 hva->hdd_bufptr = segp->ds_addr; 135 hva->hdd_ctl = segp->ds_len; 136 hva->hdd_descptr = (u_int32_t) ++hpa; 137 ++hva; ++segp; 138 } 139 /* Work around HPC3 DMA bug */ 140 hva->hdd_bufptr = 0; 141 hva->hdd_ctl = HDD_CTL_EOCHAIN; 142 hva->hdd_descptr = 0; 143 hva++; 144 #ifdef DMA_DEBUG 145 printf(">\n"); 146 #endif 147 bus_dmamap_sync(sc->sc_dmat, sc->sc_dmamap, 148 0, sc->sc_dmamap->dm_mapsize, 149 BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); 150 151 /* Load DMA Descriptor list */ 152 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_NDBP, 153 (u_int32_t)sc->sc_desc_pa); 154 } 155 156 void 157 hpcdma_cntl(struct hpc_dma_softc *sc, uint32_t mode) 158 { 159 160 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, mode); 161 } 162 163 void 164 hpcdma_reset(struct hpc_dma_softc *sc) 165 { 166 167 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 168 HPC_DMACTL_RESET); 169 delay(100); 170 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 0); 171 delay(1000); 172 } 173 174 void 175 hpcdma_flush(struct hpc_dma_softc *sc) 176 { 177 u_int32_t mode; 178 179 mode = bus_space_read_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL); 180 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 181 mode | HPC_DMACTL_FLUSH); 182 183 /* Wait for Active bit to drop */ 184 while (bus_space_read_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL) & 185 HPC_DMACTL_ACTIVE) { 186 bus_space_barrier(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 4, 187 BUS_SPACE_BARRIER_READ); 188 } 189 } 190
Indexes created Thu Oct 02 01:09:59 GMT 2025