1 /*- 2 * Copyright (c) 1998 - 2006 S�ren Schmidt <sos@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer, 10 * without modification, immediately at the beginning of the file. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/dev/ata/ata-dma.c,v 1.141 2006/01/05 21:27:19 sos Exp $ 27 * $DragonFly: src/sys/dev/disk/nata/ata-dma.c,v 1.1 2006/12/04 14:40:37 tgen Exp $ 28 */ 29 30 #include "opt_ata.h" 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/bus_dma.h> 35 #include <sys/endian.h> 36 #include <sys/malloc.h> 37 #include <sys/nata.h> 38 39 #include <machine/bus_dma.h> 40 41 #include "ata-all.h" 42 #include "ata-pci.h" 43 #include "ata_if.h" 44 45 /* prototypes */ 46 static void ata_dmaalloc(device_t); 47 static void ata_dmafree(device_t); 48 static void ata_dmasetprd(void *, bus_dma_segment_t *, int, int); 49 static int ata_dmaload(device_t, caddr_t, int32_t, int, void *, int *); 50 static int ata_dmaunload(device_t); 51 52 /* local vars */ 53 static MALLOC_DEFINE(M_ATADMA, "ata_dma", "ATA driver DMA"); 54 55 /* misc defines */ 56 #define MAXTABSZ PAGE_SIZE 57 #define MAXWSPCSZ PAGE_SIZE*2 58 59 struct ata_dc_cb_args { 60 bus_addr_t maddr; 61 int error; 62 }; 63 64 void 65 ata_dmainit(device_t dev) 66 { 67 struct ata_channel *ch = device_get_softc(dev); 68 69 if ((ch->dma = kmalloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) { 70 ch->dma->alloc = ata_dmaalloc; 71 ch->dma->free = ata_dmafree; 72 ch->dma->setprd = ata_dmasetprd; 73 ch->dma->load = ata_dmaload; 74 ch->dma->unload = ata_dmaunload; 75 ch->dma->alignment = 2; 76 ch->dma->boundary = 128 * DEV_BSIZE; 77 ch->dma->segsize = 128 * DEV_BSIZE; 78 ch->dma->max_iosize = 128 * DEV_BSIZE; 79 } 80 } 81 82 void 83 ata_dmauninit(device_t dev) 84 { 85 struct ata_channel *ch = device_get_softc(dev); 86 87 if (ch->dma) { 88 kfree(ch->dma, M_ATADMA); 89 ch->dma = NULL; 90 } 91 } 92 93 static void 94 ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 95 { 96 struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc; 97 98 if (!(cba->error = error)) 99 cba->maddr = segs[0].ds_addr; 100 } 101 102 static void 103 ata_dmaalloc(device_t dev) 104 { 105 struct ata_channel *ch = device_get_softc(dev); 106 struct ata_dc_cb_args ccba; 107 108 if (bus_dma_tag_create(NULL, ch->dma->alignment, 0, 109 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 110 NULL, NULL, ch->dma->max_iosize, 111 ATA_DMA_ENTRIES, ch->dma->segsize, 112 0, &ch->dma->dmatag)) 113 goto error; 114 115 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 116 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 117 NULL, NULL, MAXTABSZ, 1, MAXTABSZ, 118 0, &ch->dma->sg_tag)) 119 goto error; 120 121 if (bus_dma_tag_create(ch->dma->dmatag,ch->dma->alignment,ch->dma->boundary, 122 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 123 NULL, NULL, ch->dma->max_iosize, 124 ATA_DMA_ENTRIES, ch->dma->segsize, 125 0, &ch->dma->data_tag)) 126 goto error; 127 128 if (bus_dmamem_alloc(ch->dma->sg_tag, (void **)&ch->dma->sg, 0, 129 &ch->dma->sg_map)) 130 goto error; 131 132 if (bus_dmamap_load(ch->dma->sg_tag, ch->dma->sg_map, ch->dma->sg, 133 MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 134 bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map); 135 goto error; 136 } 137 ch->dma->sg_bus = ccba.maddr; 138 139 if (bus_dmamap_create(ch->dma->data_tag, 0, &ch->dma->data_map)) 140 goto error; 141 142 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, 64 * 1024, 143 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 144 NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ, 145 0, &ch->dma->work_tag)) 146 goto error; 147 148 if (bus_dmamem_alloc(ch->dma->work_tag, (void **)&ch->dma->work, 0, 149 &ch->dma->work_map)) 150 goto error; 151 152 if (bus_dmamap_load(ch->dma->work_tag, ch->dma->work_map,ch->dma->work, 153 MAXWSPCSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 154 bus_dmamem_free(ch->dma->work_tag,ch->dma->work, ch->dma->work_map); 155 goto error; 156 } 157 ch->dma->work_bus = ccba.maddr; 158 159 return; 160 161 error: 162 device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n"); 163 ata_dmafree(dev); 164 kfree(ch->dma, M_ATADMA); 165 ch->dma = NULL; 166 } 167 168 static void 169 ata_dmafree(device_t dev) 170 { 171 struct ata_channel *ch = device_get_softc(dev); 172 173 if (ch->dma->work_bus) { 174 bus_dmamap_unload(ch->dma->work_tag, ch->dma->work_map); 175 bus_dmamem_free(ch->dma->work_tag, ch->dma->work, ch->dma->work_map); 176 ch->dma->work_bus = 0; 177 ch->dma->work_map = NULL; 178 ch->dma->work = NULL; 179 } 180 if (ch->dma->work_tag) { 181 bus_dma_tag_destroy(ch->dma->work_tag); 182 ch->dma->work_tag = NULL; 183 } 184 if (ch->dma->sg_bus) { 185 bus_dmamap_unload(ch->dma->sg_tag, ch->dma->sg_map); 186 bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map); 187 ch->dma->sg_bus = 0; 188 ch->dma->sg_map = NULL; 189 ch->dma->sg = NULL; 190 } 191 if (ch->dma->data_map) { 192 bus_dmamap_destroy(ch->dma->data_tag, ch->dma->data_map); 193 ch->dma->data_map = NULL; 194 } 195 if (ch->dma->sg_tag) { 196 bus_dma_tag_destroy(ch->dma->sg_tag); 197 ch->dma->sg_tag = NULL; 198 } 199 if (ch->dma->data_tag) { 200 bus_dma_tag_destroy(ch->dma->data_tag); 201 ch->dma->data_tag = NULL; 202 } 203 if (ch->dma->dmatag) { 204 bus_dma_tag_destroy(ch->dma->dmatag); 205 ch->dma->dmatag = NULL; 206 } 207 } 208 209 static void 210 ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 211 { 212 struct ata_dmasetprd_args *args = xsc; 213 struct ata_dma_prdentry *prd = args->dmatab; 214 int i; 215 216 if ((args->error = error)) 217 return; 218 219 for (i = 0; i < nsegs; i++) { 220 prd[i].addr = htole32(segs[i].ds_addr); 221 prd[i].count = htole32(segs[i].ds_len); 222 } 223 prd[i - 1].count |= htole32(ATA_DMA_EOT); 224 args->nsegs = nsegs; 225 } 226 227 static int 228 ata_dmaload(device_t dev, caddr_t data, int32_t count, int dir, 229 void *addr, int *entries) 230 { 231 struct ata_channel *ch = device_get_softc(dev); 232 struct ata_dmasetprd_args cba; 233 int error; 234 235 if (ch->dma->flags & ATA_DMA_LOADED) { 236 device_printf(dev, "FAILURE - already active DMA on this device\n"); 237 return EIO; 238 } 239 if (!count) { 240 device_printf(dev, "FAILURE - zero length DMA transfer attempted\n"); 241 return EIO; 242 } 243 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 244 (count & (ch->dma->alignment - 1))) { 245 device_printf(dev, "FAILURE - non aligned DMA transfer attempted\n"); 246 return EIO; 247 } 248 if (count > ch->dma->max_iosize) { 249 device_printf(dev, "FAILURE - oversized DMA transfer attempt %d > %d\n", 250 count, ch->dma->max_iosize); 251 return EIO; 252 } 253 254 cba.dmatab = addr; 255 256 if ((error = bus_dmamap_load(ch->dma->data_tag, ch->dma->data_map, 257 data, count, ch->dma->setprd, &cba, 258 BUS_DMA_NOWAIT)) || (error = cba.error)) 259 return error; 260 261 *entries = cba.nsegs; 262 263 bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, BUS_DMASYNC_PREWRITE); 264 265 bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map, 266 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 267 268 ch->dma->cur_iosize = count; 269 ch->dma->flags = dir ? (ATA_DMA_LOADED | ATA_DMA_READ) : ATA_DMA_LOADED; 270 return 0; 271 } 272 273 int 274 ata_dmaunload(device_t dev) 275 { 276 struct ata_channel *ch = device_get_softc(dev); 277 278 if (ch->dma->flags & ATA_DMA_LOADED) { 279 bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, 280 BUS_DMASYNC_POSTWRITE); 281 282 bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map, 283 (ch->dma->flags & ATA_DMA_READ) != 0 ? 284 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 285 bus_dmamap_unload(ch->dma->data_tag, ch->dma->data_map); 286 287 ch->dma->cur_iosize = 0; 288 ch->dma->flags &= ~ATA_DMA_LOADED; 289 } 290 return 0; 291 } 292