1 /*- 2 * Copyright (c) 1998 - 2004 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 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/ata.h> 35 #include <sys/kernel.h> 36 #include <sys/endian.h> 37 #include <sys/malloc.h> 38 #include <sys/lock.h> 39 #include <sys/sema.h> 40 #include <sys/taskqueue.h> 41 #include <vm/uma.h> 42 #include <sys/bus.h> 43 #include <machine/bus.h> 44 #include <sys/rman.h> 45 #include <dev/pci/pcivar.h> 46 #include <dev/ata/ata-all.h> 47 #include <dev/ata/ata-pci.h> 48 49 /* prototypes */ 50 static void ata_dmaalloc(struct ata_channel *); 51 static void ata_dmafree(struct ata_channel *); 52 static void ata_dmasetupd_cb(void *, bus_dma_segment_t *, int, int); 53 static int ata_dmaload(struct ata_device *, caddr_t, int32_t, int); 54 static int ata_dmaunload(struct ata_channel *); 55 56 /* local vars */ 57 static MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA"); 58 59 /* misc defines */ 60 #define MAXSEGSZ PAGE_SIZE 61 #define MAXTABSZ PAGE_SIZE 62 #define MAXWSPCSZ 256 63 #define MAXCTLDMASZ (2 * (MAXTABSZ + MAXPHYS)) 64 65 struct ata_dc_cb_args { 66 bus_addr_t maddr; 67 int error; 68 }; 69 70 void 71 ata_dmainit(struct ata_channel *ch) 72 { 73 if ((ch->dma = malloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) { 74 ch->dma->alloc = ata_dmaalloc; 75 ch->dma->free = ata_dmafree; 76 ch->dma->load = ata_dmaload; 77 ch->dma->unload = ata_dmaunload; 78 ch->dma->alignment = 2; 79 ch->dma->max_iosize = 64 * 1024; 80 ch->dma->boundary = 64 * 1024; 81 } 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(struct ata_channel *ch) 96 { 97 struct ata_dc_cb_args ccba; 98 99 if (bus_dma_tag_create(NULL, 1, 0, 100 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 101 NULL, NULL, MAXCTLDMASZ, 102 ATA_DMA_ENTRIES, BUS_SPACE_MAXSIZE_32BIT, 103 BUS_DMA_ALLOCNOW, 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 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->cdmatag)) 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->boundary, 116 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->ddmatag)) 117 goto error; 118 119 if (bus_dmamem_alloc(ch->dma->cdmatag, (void **)&ch->dma->dmatab, 0, 120 &ch->dma->cdmamap)) 121 goto error; 122 123 if (bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, ch->dma->dmatab, 124 MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 125 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 126 goto error; 127 } 128 ch->dma->mdmatab = ccba.maddr; 129 130 if (bus_dmamap_create(ch->dma->ddmatag, 0, &ch->dma->ddmamap)) 131 goto error; 132 133 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 134 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 135 NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ, 136 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->wdmatag)) 137 goto error; 138 139 if (bus_dmamem_alloc(ch->dma->wdmatag, (void **)&ch->dma->workspace, 0, 140 &ch->dma->wdmamap)) 141 goto error; 142 143 if (bus_dmamap_load(ch->dma->wdmatag, ch->dma->wdmamap, ch->dma->workspace, 144 MAXWSPCSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 145 bus_dmamem_free(ch->dma->wdmatag, ch->dma->workspace, ch->dma->wdmamap); 146 goto error; 147 } 148 ch->dma->wdmatab = ccba.maddr; 149 150 return; 151 152 error: 153 ata_printf(ch, -1, "WARNING - DMA allocation failed, disabling DMA\n"); 154 ata_dmafree(ch); 155 free(ch->dma, M_ATADMA); 156 ch->dma = NULL; 157 } 158 159 static void 160 ata_dmafree(struct ata_channel *ch) 161 { 162 if (ch->dma->wdmatab) { 163 bus_dmamap_unload(ch->dma->wdmatag, ch->dma->wdmamap); 164 bus_dmamem_free(ch->dma->wdmatag, ch->dma->workspace, ch->dma->wdmamap); 165 ch->dma->wdmatab = 0; 166 ch->dma->wdmamap = NULL; 167 ch->dma->workspace = NULL; 168 } 169 if (ch->dma->wdmatag) { 170 bus_dma_tag_destroy(ch->dma->wdmatag); 171 ch->dma->wdmatag = NULL; 172 } 173 if (ch->dma->mdmatab) { 174 bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap); 175 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 176 ch->dma->mdmatab = 0; 177 ch->dma->cdmamap = NULL; 178 ch->dma->dmatab = NULL; 179 } 180 if (ch->dma->ddmamap) { 181 bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap); 182 ch->dma->ddmamap = NULL; 183 } 184 if (ch->dma->cdmatag) { 185 bus_dma_tag_destroy(ch->dma->cdmatag); 186 ch->dma->cdmatag = NULL; 187 } 188 if (ch->dma->ddmatag) { 189 bus_dma_tag_destroy(ch->dma->ddmatag); 190 ch->dma->ddmatag = NULL; 191 } 192 if (ch->dma->dmatag) { 193 bus_dma_tag_destroy(ch->dma->dmatag); 194 ch->dma->dmatag = NULL; 195 } 196 } 197 198 struct ata_dmasetup_data_cb_args { 199 struct ata_dmaentry *dmatab; 200 int error; 201 }; 202 203 static void 204 ata_dmasetupd_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 205 { 206 struct ata_dmasetup_data_cb_args *cba = 207 (struct ata_dmasetup_data_cb_args *)xsc; 208 bus_size_t cnt; 209 u_int32_t lastcount; 210 int i, j; 211 212 cba->error = error; 213 if (error != 0) 214 return; 215 lastcount = j = 0; 216 for (i = 0; i < nsegs; i++) { 217 /* 218 * A maximum segment size was specified for bus_dma_tag_create, but 219 * some busdma code does not seem to honor this, so fix up if needed. 220 */ 221 for (cnt = 0; cnt < segs[i].ds_len; cnt += MAXSEGSZ, j++) { 222 cba->dmatab[j].base = htole32(segs[i].ds_addr + cnt); 223 lastcount = ulmin(segs[i].ds_len - cnt, MAXSEGSZ) & 0xffff; 224 cba->dmatab[j].count = htole32(lastcount); 225 } 226 } 227 cba->dmatab[j - 1].count = htole32(lastcount | ATA_DMA_EOT); 228 } 229 230 static int 231 ata_dmaload(struct ata_device *atadev, caddr_t data, int32_t count, int dir) 232 { 233 struct ata_channel *ch = atadev->channel; 234 struct ata_dmasetup_data_cb_args cba; 235 236 if (ch->dma->flags & ATA_DMA_ACTIVE) { 237 ata_prtdev(atadev, "FAILURE - already active DMA on this device\n"); 238 return -1; 239 } 240 if (!count) { 241 ata_prtdev(atadev, "FAILURE - zero length DMA transfer attempted\n"); 242 return -1; 243 } 244 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 245 (count & (ch->dma->alignment - 1))) { 246 ata_prtdev(atadev, "FAILURE - non aligned DMA transfer attempted\n"); 247 return -1; 248 } 249 if (count > ch->dma->max_iosize) { 250 ata_prtdev(atadev, 251 "FAILURE - oversized DMA transfer attempted %d > %d\n", 252 count, ch->dma->max_iosize); 253 return -1; 254 } 255 256 cba.dmatab = ch->dma->dmatab; 257 258 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE); 259 260 if (bus_dmamap_load(ch->dma->ddmatag, ch->dma->ddmamap, data, count, 261 ata_dmasetupd_cb, &cba, 0) || cba.error) 262 return -1; 263 264 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 265 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 266 267 ch->dma->cur_iosize = count; 268 ch->dma->flags = dir ? (ATA_DMA_ACTIVE | ATA_DMA_READ) : ATA_DMA_ACTIVE; 269 270 return 0; 271 } 272 273 int 274 ata_dmaunload(struct ata_channel *ch) 275 { 276 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_POSTWRITE); 277 278 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 279 (ch->dma->flags & ATA_DMA_READ) != 0 ? 280 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 281 bus_dmamap_unload(ch->dma->ddmatag, ch->dma->ddmamap); 282 283 ch->dma->cur_iosize = 0; 284 ch->dma->flags = 0; 285 286 return 0; 287 } 288