1 /*- 2 * Copyright (c) 1998 - 2003 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/mutex.h> 40 #include <sys/taskqueue.h> 41 #include <sys/bus.h> 42 #include <machine/bus.h> 43 #include <sys/rman.h> 44 #include <dev/pci/pcivar.h> 45 #include <dev/ata/ata-all.h> 46 #include <dev/ata/ata-pci.h> 47 48 /* prototypes */ 49 static void ata_dmaalloc(struct ata_channel *); 50 static void ata_dmafree(struct ata_channel *); 51 static void ata_dmasetupd_cb(void *, bus_dma_segment_t *, int, int); 52 static int ata_dmaload(struct ata_device *, caddr_t, int32_t, int); 53 static int ata_dmaunload(struct ata_channel *); 54 55 /* local vars */ 56 static MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA"); 57 58 /* misc defines */ 59 #define MAXSEGSZ PAGE_SIZE 60 #define MAXTABSZ PAGE_SIZE 61 #define MAXCTLDMASZ (2 * (MAXTABSZ + MAXPHYS)) 62 63 struct ata_dc_cb_args { 64 bus_addr_t maddr; 65 int error; 66 }; 67 68 void 69 ata_dmainit(struct ata_channel *ch) 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->load = ata_dmaload; 75 ch->dma->unload = ata_dmaunload; 76 ch->dma->alignment = 2; 77 ch->dma->max_iosize = 64*1024; 78 } 79 } 80 81 82 static void 83 ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 84 { 85 struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc; 86 87 if (!(cba->error = error)) 88 cba->maddr = segs[0].ds_addr; 89 } 90 91 static void 92 ata_dmaalloc(struct ata_channel *ch) 93 { 94 struct ata_dc_cb_args ccba; 95 96 if (bus_dma_tag_create(NULL, 1, 0, 97 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 98 NULL, NULL, MAXCTLDMASZ, 99 ATA_DMA_ENTRIES, BUS_SPACE_MAXSIZE_32BIT, 100 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->dmatag)) 101 goto error; 102 103 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 104 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 105 NULL, NULL, MAXTABSZ, 1, MAXTABSZ, 106 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->cdmatag)) 107 goto error; 108 109 if (bus_dma_tag_create(ch->dma->dmatag, ch->dma->alignment, 64*1024, 110 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 111 NULL, NULL, MAXPHYS, ATA_DMA_ENTRIES, MAXSEGSZ, 112 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->ddmatag)) 113 goto error; 114 115 if (bus_dmamem_alloc(ch->dma->cdmatag, (void **)&ch->dma->dmatab, 0, 116 &ch->dma->cdmamap)) 117 goto error; 118 119 if (bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, ch->dma->dmatab, 120 MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 121 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab,ch->dma->cdmamap); 122 goto error; 123 } 124 ch->dma->mdmatab = ccba.maddr; 125 if (bus_dmamap_create(ch->dma->ddmatag, 0, &ch->dma->ddmamap)) 126 goto error; 127 return; 128 129 error: 130 ata_printf(ch, -1, "WARNING - DMA tag allocation failed, disabling DMA\n"); 131 ata_dmafree(ch); 132 free(ch->dma, M_ATADMA); 133 ch->dma = NULL; 134 } 135 136 static void 137 ata_dmafree(struct ata_channel *ch) 138 { 139 if (ch->dma->mdmatab) { 140 bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap); 141 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 142 ch->dma->mdmatab = 0; 143 ch->dma->cdmamap = NULL; 144 ch->dma->dmatab = NULL; 145 } 146 if (ch->dma->ddmamap) { 147 bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap); 148 ch->dma->ddmamap = NULL; 149 } 150 if (ch->dma->cdmatag) { 151 bus_dma_tag_destroy(ch->dma->cdmatag); 152 ch->dma->cdmatag = NULL; 153 } 154 if (ch->dma->ddmatag) { 155 bus_dma_tag_destroy(ch->dma->ddmatag); 156 ch->dma->ddmatag = NULL; 157 } 158 if (ch->dma->dmatag) { 159 bus_dma_tag_destroy(ch->dma->dmatag); 160 ch->dma->dmatag = NULL; 161 } 162 } 163 164 struct ata_dmasetup_data_cb_args { 165 struct ata_dmaentry *dmatab; 166 int error; 167 }; 168 169 static void 170 ata_dmasetupd_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 171 { 172 struct ata_dmasetup_data_cb_args *cba = 173 (struct ata_dmasetup_data_cb_args *)xsc; 174 bus_size_t cnt; 175 u_int32_t lastcount; 176 int i, j; 177 178 cba->error = error; 179 if (error != 0) 180 return; 181 lastcount = j = 0; 182 for (i = 0; i < nsegs; i++) { 183 /* 184 * A maximum segment size was specified for bus_dma_tag_create, but 185 * some busdma code does not seem to honor this, so fix up if needed. 186 */ 187 for (cnt = 0; cnt < segs[i].ds_len; cnt += MAXSEGSZ, j++) { 188 cba->dmatab[j].base = htole32(segs[i].ds_addr + cnt); 189 lastcount = ulmin(segs[i].ds_len - cnt, MAXSEGSZ) & 0xffff; 190 cba->dmatab[j].count = htole32(lastcount); 191 } 192 } 193 cba->dmatab[j - 1].count = htole32(lastcount | ATA_DMA_EOT); 194 } 195 196 static int 197 ata_dmaload(struct ata_device *atadev, caddr_t data, int32_t count, int dir) 198 { 199 struct ata_channel *ch = atadev->channel; 200 struct ata_dmasetup_data_cb_args cba; 201 202 if (ch->dma->flags & ATA_DMA_ACTIVE) { 203 ata_prtdev(atadev, "FAILURE - already active DMA on this device\n"); 204 return -1; 205 } 206 if (!count) { 207 ata_prtdev(atadev, "FAILURE - zero length DMA transfer attempted\n"); 208 return -1; 209 } 210 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 211 (count & (ch->dma->alignment - 1))) { 212 ata_prtdev(atadev, "FAILURE - non aligned DMA transfer attempted\n"); 213 return -1; 214 } 215 if (count > ch->dma->max_iosize) { 216 ata_prtdev(atadev, 217 "FAILURE - oversized DMA transfer attempted %d > %d\n", 218 count, ch->dma->max_iosize); 219 return -1; 220 } 221 222 cba.dmatab = ch->dma->dmatab; 223 224 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE); 225 226 if (bus_dmamap_load(ch->dma->ddmatag, ch->dma->ddmamap, data, count, 227 ata_dmasetupd_cb, &cba, 0) || cba.error) 228 return -1; 229 230 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 231 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 232 233 ch->dma->cur_iosize = count; 234 ch->dma->flags = dir ? (ATA_DMA_ACTIVE | ATA_DMA_READ) : ATA_DMA_ACTIVE; 235 236 return 0; 237 } 238 239 int 240 ata_dmaunload(struct ata_channel *ch) 241 { 242 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_POSTWRITE); 243 244 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 245 (ch->dma->flags & ATA_DMA_READ) != 0 ? 246 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 247 bus_dmamap_unload(ch->dma->ddmatag, ch->dma->ddmamap); 248 249 ch->dma->cur_iosize = 0; 250 ch->dma->flags = 0; 251 252 return 0; 253 } 254