1 /*- 2 * Copyright (c) 1998 - 2007 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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/ata.h> 33 #include <sys/kernel.h> 34 #include <sys/endian.h> 35 #include <sys/malloc.h> 36 #include <sys/lock.h> 37 #include <sys/sema.h> 38 #include <sys/taskqueue.h> 39 #include <vm/uma.h> 40 #include <sys/bus.h> 41 #include <machine/bus.h> 42 #include <sys/rman.h> 43 #include <dev/pci/pcivar.h> 44 #include <dev/ata/ata-all.h> 45 #include <dev/ata/ata-pci.h> 46 47 /* prototypes */ 48 static void ata_dmaalloc(device_t); 49 static void ata_dmafree(device_t); 50 static void ata_dmasetprd(void *, bus_dma_segment_t *, int, int); 51 static int ata_dmaload(device_t, caddr_t, int32_t, int, void *, int *); 52 static int ata_dmaunload(device_t); 53 54 /* local vars */ 55 static MALLOC_DEFINE(M_ATADMA, "ata_dma", "ATA driver DMA"); 56 57 /* misc defines */ 58 #define MAXTABSZ PAGE_SIZE 59 #define MAXWSPCSZ PAGE_SIZE*2 60 61 struct ata_dc_cb_args { 62 bus_addr_t maddr; 63 int error; 64 }; 65 66 void 67 ata_dmainit(device_t dev) 68 { 69 struct ata_channel *ch = device_get_softc(dev); 70 71 if ((ch->dma = malloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) { 72 ch->dma->alloc = ata_dmaalloc; 73 ch->dma->free = ata_dmafree; 74 ch->dma->setprd = ata_dmasetprd; 75 ch->dma->load = ata_dmaload; 76 ch->dma->unload = ata_dmaunload; 77 ch->dma->alignment = 2; 78 ch->dma->boundary = 128 * DEV_BSIZE; 79 ch->dma->segsize = 128 * DEV_BSIZE; 80 ch->dma->max_iosize = 128 * DEV_BSIZE; 81 } 82 } 83 84 static void 85 ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 86 { 87 struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc; 88 89 if (!(cba->error = error)) 90 cba->maddr = segs[0].ds_addr; 91 } 92 93 static void 94 ata_dmaalloc(device_t dev) 95 { 96 struct ata_channel *ch = device_get_softc(dev); 97 struct ata_dc_cb_args ccba; 98 99 if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma->alignment, 0, 100 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 101 NULL, NULL, ch->dma->max_iosize, 102 ATA_DMA_ENTRIES, ch->dma->segsize, 103 0, NULL, NULL, &ch->dma->dmatag)) 104 goto error; 105 106 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 107 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 108 NULL, NULL, MAXTABSZ, 1, MAXTABSZ, 109 0, NULL, NULL, &ch->dma->sg_tag)) 110 goto error; 111 112 if (bus_dma_tag_create(ch->dma->dmatag,ch->dma->alignment,ch->dma->boundary, 113 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 114 NULL, NULL, ch->dma->max_iosize, 115 ATA_DMA_ENTRIES, ch->dma->segsize, 116 0, NULL, NULL, &ch->dma->data_tag)) 117 goto error; 118 119 if (bus_dmamem_alloc(ch->dma->sg_tag, (void **)&ch->dma->sg, 0, 120 &ch->dma->sg_map)) 121 goto error; 122 123 if (bus_dmamap_load(ch->dma->sg_tag, ch->dma->sg_map, ch->dma->sg, 124 MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 125 bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map); 126 goto error; 127 } 128 ch->dma->sg_bus = ccba.maddr; 129 130 if (bus_dmamap_create(ch->dma->data_tag, 0, &ch->dma->data_map)) 131 goto error; 132 133 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, 64 * 1024, 134 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 135 NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ, 136 0, NULL, NULL, &ch->dma->work_tag)) 137 goto error; 138 139 if (bus_dmamem_alloc(ch->dma->work_tag, (void **)&ch->dma->work, 0, 140 &ch->dma->work_map)) 141 goto error; 142 143 if (bus_dmamap_load(ch->dma->work_tag, ch->dma->work_map,ch->dma->work, 144 MAXWSPCSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 145 bus_dmamem_free(ch->dma->work_tag,ch->dma->work, ch->dma->work_map); 146 goto error; 147 } 148 ch->dma->work_bus = ccba.maddr; 149 150 return; 151 152 error: 153 device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n"); 154 ata_dmafree(dev); 155 free(ch->dma, M_ATADMA); 156 ch->dma = NULL; 157 } 158 159 static void 160 ata_dmafree(device_t dev) 161 { 162 struct ata_channel *ch = device_get_softc(dev); 163 164 if (ch->dma->work_bus) { 165 bus_dmamap_unload(ch->dma->work_tag, ch->dma->work_map); 166 bus_dmamem_free(ch->dma->work_tag, ch->dma->work, ch->dma->work_map); 167 ch->dma->work_bus = 0; 168 ch->dma->work_map = NULL; 169 ch->dma->work = NULL; 170 } 171 if (ch->dma->work_tag) { 172 bus_dma_tag_destroy(ch->dma->work_tag); 173 ch->dma->work_tag = NULL; 174 } 175 if (ch->dma->sg_bus) { 176 bus_dmamap_unload(ch->dma->sg_tag, ch->dma->sg_map); 177 bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map); 178 ch->dma->sg_bus = 0; 179 ch->dma->sg_map = NULL; 180 ch->dma->sg = NULL; 181 } 182 if (ch->dma->data_map) { 183 bus_dmamap_destroy(ch->dma->data_tag, ch->dma->data_map); 184 ch->dma->data_map = NULL; 185 } 186 if (ch->dma->sg_tag) { 187 bus_dma_tag_destroy(ch->dma->sg_tag); 188 ch->dma->sg_tag = NULL; 189 } 190 if (ch->dma->data_tag) { 191 bus_dma_tag_destroy(ch->dma->data_tag); 192 ch->dma->data_tag = NULL; 193 } 194 if (ch->dma->dmatag) { 195 bus_dma_tag_destroy(ch->dma->dmatag); 196 ch->dma->dmatag = NULL; 197 } 198 } 199 200 static void 201 ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 202 { 203 struct ata_dmasetprd_args *args = xsc; 204 struct ata_dma_prdentry *prd = args->dmatab; 205 int i; 206 207 if ((args->error = error)) 208 return; 209 210 for (i = 0; i < nsegs; i++) { 211 prd[i].addr = htole32(segs[i].ds_addr); 212 prd[i].count = htole32(segs[i].ds_len); 213 } 214 prd[i - 1].count |= htole32(ATA_DMA_EOT); 215 args->nsegs = nsegs; 216 } 217 218 static int 219 ata_dmaload(device_t dev, caddr_t data, int32_t count, int dir, 220 void *addr, int *entries) 221 { 222 struct ata_channel *ch = device_get_softc(dev); 223 struct ata_dmasetprd_args cba; 224 int error; 225 226 if (ch->dma->flags & ATA_DMA_LOADED) { 227 device_printf(dev, "FAILURE - already active DMA on this device\n"); 228 return EIO; 229 } 230 if (!count) { 231 device_printf(dev, "FAILURE - zero length DMA transfer attempted\n"); 232 return EIO; 233 } 234 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 235 (count & (ch->dma->alignment - 1))) { 236 device_printf(dev, "FAILURE - non aligned DMA transfer attempted\n"); 237 return EIO; 238 } 239 if (count > ch->dma->max_iosize) { 240 device_printf(dev, "FAILURE - oversized DMA transfer attempt %d > %d\n", 241 count, ch->dma->max_iosize); 242 return EIO; 243 } 244 245 cba.dmatab = addr; 246 247 if ((error = bus_dmamap_load(ch->dma->data_tag, ch->dma->data_map, 248 data, count, ch->dma->setprd, &cba, 249 BUS_DMA_NOWAIT)) || (error = cba.error)) 250 return error; 251 252 *entries = cba.nsegs; 253 254 bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, BUS_DMASYNC_PREWRITE); 255 256 bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map, 257 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 258 259 ch->dma->cur_iosize = count; 260 ch->dma->flags = dir ? (ATA_DMA_LOADED | ATA_DMA_READ) : ATA_DMA_LOADED; 261 return 0; 262 } 263 264 int 265 ata_dmaunload(device_t dev) 266 { 267 struct ata_channel *ch = device_get_softc(dev); 268 269 if (ch->dma->flags & ATA_DMA_LOADED) { 270 bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, 271 BUS_DMASYNC_POSTWRITE); 272 273 bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map, 274 (ch->dma->flags & ATA_DMA_READ) != 0 ? 275 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 276 bus_dmamap_unload(ch->dma->data_tag, ch->dma->data_map); 277 278 ch->dma->cur_iosize = 0; 279 ch->dma->flags &= ~ATA_DMA_LOADED; 280 } 281 return 0; 282 } 283