ata-dma.c revision 145713
1/*- 2 * Copyright (c) 1998 - 2005 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: head/sys/dev/ata/ata-dma.c 145713 2005-04-30 16:22:07Z sos $"); 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 */ 50static void ata_dmaalloc(device_t); 51static void ata_dmafree(device_t); 52static void ata_dmasetprd(void *, bus_dma_segment_t *, int, int); 53static int ata_dmaload(device_t, caddr_t, int32_t, int); 54static int ata_dmaunload(device_t); 55 56/* local vars */ 57static MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA"); 58 59/* misc defines */ 60#define MAXTABSZ PAGE_SIZE 61#define MAXWSPCSZ PAGE_SIZE*2 62 63struct ata_dc_cb_args { 64 bus_addr_t maddr; 65 int error; 66}; 67 68void 69ata_dmainit(device_t dev) 70{ 71 struct ata_channel *ch = device_get_softc(dev); 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->setprd = ata_dmasetprd; 77 ch->dma->load = ata_dmaload; 78 ch->dma->unload = ata_dmaunload; 79 ch->dma->alignment = 2; 80 ch->dma->max_iosize = 128 * DEV_BSIZE; 81 ch->dma->boundary = 128 * DEV_BSIZE; 82 } 83} 84 85static void 86ata_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 94static void 95ata_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(NULL, ch->dma->alignment, 0, 101 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 102 NULL, NULL, 256 * DEV_BSIZE, 103 ATA_DMA_ENTRIES, ch->dma->max_iosize, 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 BUS_SPACE_MAXADDR_32BIT, 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 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 115 NULL, NULL, 256 * DEV_BSIZE, 116 ATA_DMA_ENTRIES, ch->dma->max_iosize, 117 BUS_DMA_ALLOCNOW, 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 BUS_SPACE_MAXADDR_32BIT, 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 153error: 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 160static void 161ata_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 201static void 202ata_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} 217 218static int 219ata_dmaload(device_t dev, caddr_t data, int32_t count, int dir) 220{ 221 struct ata_channel *ch = device_get_softc(device_get_parent(dev)); 222 struct ata_dmasetprd_args cba; 223 224 if (ch->dma->flags & ATA_DMA_LOADED) { 225 device_printf(dev, "FAILURE - already active DMA on this device\n"); 226 return -1; 227 } 228 if (!count) { 229 device_printf(dev, "FAILURE - zero length DMA transfer attempted\n"); 230 return -1; 231 } 232 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 233 (count & (ch->dma->alignment - 1))) { 234 device_printf(dev, "FAILURE - non aligned DMA transfer attempted\n"); 235 return -1; 236 } 237 if (count > ch->dma->max_iosize) { 238 device_printf(dev, "FAILURE - oversized DMA transfer attempt %d > %d\n", 239 count, ch->dma->max_iosize); 240 return -1; 241 } 242 243 cba.dmatab = ch->dma->sg; 244 245 if (bus_dmamap_load(ch->dma->data_tag, ch->dma->data_map, data, count, 246 ch->dma->setprd, &cba, 0) || cba.error) 247 return -1; 248 249 bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, BUS_DMASYNC_PREWRITE); 250 251 bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map, 252 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 253 254 ch->dma->cur_iosize = count; 255 ch->dma->flags = dir ? (ATA_DMA_LOADED | ATA_DMA_READ) : ATA_DMA_LOADED; 256 return 0; 257} 258 259int 260ata_dmaunload(device_t dev) 261{ 262 struct ata_channel *ch = device_get_softc(device_get_parent(dev)); 263 bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, BUS_DMASYNC_POSTWRITE); 264 265 bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map, 266 (ch->dma->flags & ATA_DMA_READ) != 0 ? 267 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 268 bus_dmamap_unload(ch->dma->data_tag, ch->dma->data_map); 269 270 ch->dma->cur_iosize = 0; 271 ch->dma->flags &= ~ATA_DMA_LOADED; 272 return 0; 273} 274