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 = 65536; 79 ch->dma->segsize = 128 * DEV_BSIZE; 80 ch->dma->max_iosize = 128 * DEV_BSIZE; 81 ch->dma->max_address = BUS_SPACE_MAXADDR_32BIT; 82 } 83 } 84 85 static void 86 ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 87 { 88 struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc; 89 90 if (!(cba->error = error)) 91 cba->maddr = segs[0].ds_addr; 92 } 93 94 static void 95 ata_dmaalloc(device_t dev) 96 { 97 struct ata_channel *ch = device_get_softc(dev); 98 struct ata_dc_cb_args ccba; 99 100 if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma->alignment, 0, 101 ch->dma->max_address, BUS_SPACE_MAXADDR, 102 NULL, NULL, ch->dma->max_iosize, 103 ATA_DMA_ENTRIES, ch->dma->segsize, 104 0, NULL, NULL, &ch->dma->dmatag)) 105 goto error; 106 107 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 108 ch->dma->max_address, BUS_SPACE_MAXADDR, 109 NULL, NULL, MAXTABSZ, 1, MAXTABSZ, 110 0, NULL, NULL, &ch->dma->sg_tag)) 111 goto error; 112 113 if (bus_dma_tag_create(ch->dma->dmatag,ch->dma->alignment,ch->dma->boundary, 114 ch->dma->max_address, BUS_SPACE_MAXADDR, 115 NULL, NULL, ch->dma->max_iosize, 116 ATA_DMA_ENTRIES, ch->dma->segsize, 117 0, NULL, NULL, &ch->dma->data_tag)) 118 goto error; 119 120 if (bus_dmamem_alloc(ch->dma->sg_tag, (void **)&ch->dma->sg, 0, 121 &ch->dma->sg_map)) 122 goto error; 123 124 if (bus_dmamap_load(ch->dma->sg_tag, ch->dma->sg_map, ch->dma->sg, 125 MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 126 bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map); 127 goto error; 128 } 129 ch->dma->sg_bus = ccba.maddr; 130 131 if (bus_dmamap_create(ch->dma->data_tag, 0, &ch->dma->data_map)) 132 goto error; 133 134 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, 64 * 1024, 135 ch->dma->max_address, BUS_SPACE_MAXADDR, 136 NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ, 137 0, NULL, NULL, &ch->dma->work_tag)) 138 goto error; 139 140 if (bus_dmamem_alloc(ch->dma->work_tag, (void **)&ch->dma->work, 0, 141 &ch->dma->work_map)) 142 goto error; 143 144 if (bus_dmamap_load(ch->dma->work_tag, ch->dma->work_map,ch->dma->work, 145 MAXWSPCSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 146 bus_dmamem_free(ch->dma->work_tag,ch->dma->work, ch->dma->work_map); 147 goto error; 148 } 149 ch->dma->work_bus = ccba.maddr; 150 151 return; 152 153 error: 154 device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n"); 155 ata_dmafree(dev); 156 free(ch->dma, M_ATADMA); 157 ch->dma = NULL; 158 } 159 160 static void 161 ata_dmafree(device_t dev) 162 { 163 struct ata_channel *ch = device_get_softc(dev); 164 165 if (ch->dma->work_bus) { 166 bus_dmamap_unload(ch->dma->work_tag, ch->dma->work_map); 167 bus_dmamem_free(ch->dma->work_tag, ch->dma->work, ch->dma->work_map); 168 ch->dma->work_bus = 0; 169 ch->dma->work_map = NULL; 170 ch->dma->work = NULL; 171 } 172 if (ch->dma->work_tag) { 173 bus_dma_tag_destroy(ch->dma->work_tag); 174 ch->dma->work_tag = NULL; 175 } 176 if (ch->dma->sg_bus) { 177 bus_dmamap_unload(ch->dma->sg_tag, ch->dma->sg_map); 178 bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map); 179 ch->dma->sg_bus = 0; 180 ch->dma->sg_map = NULL; 181 ch->dma->sg = NULL; 182 } 183 if (ch->dma->data_map) { 184 bus_dmamap_destroy(ch->dma->data_tag, ch->dma->data_map); 185 ch->dma->data_map = NULL; 186 } 187 if (ch->dma->sg_tag) { 188 bus_dma_tag_destroy(ch->dma->sg_tag); 189 ch->dma->sg_tag = NULL; 190 } 191 if (ch->dma->data_tag) { 192 bus_dma_tag_destroy(ch->dma->data_tag); 193 ch->dma->data_tag = NULL; 194 } 195 if (ch->dma->dmatag) { 196 bus_dma_tag_destroy(ch->dma->dmatag); 197 ch->dma->dmatag = NULL; 198 } 199 } 200 201 static void 202 ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 203 { 204 struct ata_dmasetprd_args *args = xsc; 205 struct ata_dma_prdentry *prd = args->dmatab; 206 int i; 207 208 if ((args->error = error)) 209 return; 210 211 for (i = 0; i < nsegs; i++) { 212 prd[i].addr = htole32(segs[i].ds_addr); 213 prd[i].count = htole32(segs[i].ds_len); 214 } 215 prd[i - 1].count |= htole32(ATA_DMA_EOT); 216 KASSERT(nsegs <= ATA_DMA_ENTRIES, ("too many DMA segment entries\n")); 217 args->nsegs = nsegs; 218 } 219 220 static int 221 ata_dmaload(device_t dev, caddr_t data, int32_t count, int dir, 222 void *addr, int *entries) 223 { 224 struct ata_channel *ch = device_get_softc(dev); 225 struct ata_dmasetprd_args cba; 226 int error; 227 228 if (ch->dma->flags & ATA_DMA_LOADED) { 229 device_printf(dev, "FAILURE - already active DMA on this device\n"); 230 return EIO; 231 } 232 if (!count) { 233 device_printf(dev, "FAILURE - zero length DMA transfer attempted\n"); 234 return EIO; 235 } 236 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 237 (count & (ch->dma->alignment - 1))) { 238 device_printf(dev, "FAILURE - non aligned DMA transfer attempted\n"); 239 return EIO; 240 } 241 if (count > ch->dma->max_iosize) { 242 device_printf(dev, "FAILURE - oversized DMA transfer attempt %d > %d\n", 243 count, ch->dma->max_iosize); 244 return EIO; 245 } 246 247 cba.dmatab = addr; 248 249 if ((error = bus_dmamap_load(ch->dma->data_tag, ch->dma->data_map, 250 data, count, ch->dma->setprd, &cba, 251 BUS_DMA_NOWAIT)) || (error = cba.error)) 252 return error; 253 254 *entries = cba.nsegs; 255 256 bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, BUS_DMASYNC_PREWRITE); 257 258 bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map, 259 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 260 261 ch->dma->cur_iosize = count; 262 ch->dma->flags = dir ? (ATA_DMA_LOADED | ATA_DMA_READ) : ATA_DMA_LOADED; 263 return 0; 264 } 265 266 int 267 ata_dmaunload(device_t dev) 268 { 269 struct ata_channel *ch = device_get_softc(dev); 270 271 if (ch->dma->flags & ATA_DMA_LOADED) { 272 bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, 273 BUS_DMASYNC_POSTWRITE); 274 275 bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map, 276 (ch->dma->flags & ATA_DMA_READ) ? 277 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 278 bus_dmamap_unload(ch->dma->data_tag, ch->dma->data_map); 279 280 ch->dma->cur_iosize = 0; 281 ch->dma->flags &= ~ATA_DMA_LOADED; 282 } 283 return 0; 284 } 285