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 ch->dma->boundary = 64 * 1024; 79 } 80 } 81 82 83 static void 84 ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 85 { 86 struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc; 87 88 if (!(cba->error = error)) 89 cba->maddr = segs[0].ds_addr; 90 } 91 92 static void 93 ata_dmaalloc(struct ata_channel *ch) 94 { 95 struct ata_dc_cb_args ccba; 96 97 if (bus_dma_tag_create(NULL, 1, 0, 98 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 99 NULL, NULL, MAXCTLDMASZ, 100 ATA_DMA_ENTRIES, BUS_SPACE_MAXSIZE_32BIT, 101 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->dmatag)) 102 goto error; 103 104 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 105 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 106 NULL, NULL, MAXTABSZ, 1, MAXTABSZ, 107 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->cdmatag)) 108 goto error; 109 110 if (bus_dma_tag_create(ch->dma->dmatag,ch->dma->alignment,ch->dma->boundary, 111 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 112 NULL, NULL, ch->dma->max_iosize, 113 ATA_DMA_ENTRIES, ch->dma->boundary, 114 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->ddmatag)) 115 goto error; 116 117 if (bus_dmamem_alloc(ch->dma->cdmatag, (void **)&ch->dma->dmatab, 0, 118 &ch->dma->cdmamap)) 119 goto error; 120 121 if (bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, ch->dma->dmatab, 122 MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 123 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab,ch->dma->cdmamap); 124 goto error; 125 } 126 ch->dma->mdmatab = ccba.maddr; 127 if (bus_dmamap_create(ch->dma->ddmatag, 0, &ch->dma->ddmamap)) 128 goto error; 129 return; 130 131 error: 132 ata_printf(ch, -1, "WARNING - DMA tag allocation failed, disabling DMA\n"); 133 ata_dmafree(ch); 134 free(ch->dma, M_ATADMA); 135 ch->dma = NULL; 136 } 137 138 static void 139 ata_dmafree(struct ata_channel *ch) 140 { 141 if (ch->dma->mdmatab) { 142 bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap); 143 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 144 ch->dma->mdmatab = 0; 145 ch->dma->cdmamap = NULL; 146 ch->dma->dmatab = NULL; 147 } 148 if (ch->dma->ddmamap) { 149 bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap); 150 ch->dma->ddmamap = NULL; 151 } 152 if (ch->dma->cdmatag) { 153 bus_dma_tag_destroy(ch->dma->cdmatag); 154 ch->dma->cdmatag = NULL; 155 } 156 if (ch->dma->ddmatag) { 157 bus_dma_tag_destroy(ch->dma->ddmatag); 158 ch->dma->ddmatag = NULL; 159 } 160 if (ch->dma->dmatag) { 161 bus_dma_tag_destroy(ch->dma->dmatag); 162 ch->dma->dmatag = NULL; 163 } 164 } 165 166 struct ata_dmasetup_data_cb_args { 167 struct ata_dmaentry *dmatab; 168 int error; 169 }; 170 171 static void 172 ata_dmasetupd_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 173 { 174 struct ata_dmasetup_data_cb_args *cba = 175 (struct ata_dmasetup_data_cb_args *)xsc; 176 bus_size_t cnt; 177 u_int32_t lastcount; 178 int i, j; 179 180 cba->error = error; 181 if (error != 0) 182 return; 183 lastcount = j = 0; 184 for (i = 0; i < nsegs; i++) { 185 /* 186 * A maximum segment size was specified for bus_dma_tag_create, but 187 * some busdma code does not seem to honor this, so fix up if needed. 188 */ 189 for (cnt = 0; cnt < segs[i].ds_len; cnt += MAXSEGSZ, j++) { 190 cba->dmatab[j].base = htole32(segs[i].ds_addr + cnt); 191 lastcount = ulmin(segs[i].ds_len - cnt, MAXSEGSZ) & 0xffff; 192 cba->dmatab[j].count = htole32(lastcount); 193 } 194 } 195 cba->dmatab[j - 1].count = htole32(lastcount | ATA_DMA_EOT); 196 } 197 198 static int 199 ata_dmaload(struct ata_device *atadev, caddr_t data, int32_t count, int dir) 200 { 201 struct ata_channel *ch = atadev->channel; 202 struct ata_dmasetup_data_cb_args cba; 203 204 if (ch->dma->flags & ATA_DMA_ACTIVE) { 205 ata_prtdev(atadev, "FAILURE - already active DMA on this device\n"); 206 return -1; 207 } 208 if (!count) { 209 ata_prtdev(atadev, "FAILURE - zero length DMA transfer attempted\n"); 210 return -1; 211 } 212 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 213 (count & (ch->dma->alignment - 1))) { 214 ata_prtdev(atadev, "FAILURE - non aligned DMA transfer attempted\n"); 215 return -1; 216 } 217 if (count > ch->dma->max_iosize) { 218 ata_prtdev(atadev, 219 "FAILURE - oversized DMA transfer attempted %d > %d\n", 220 count, ch->dma->max_iosize); 221 return -1; 222 } 223 224 cba.dmatab = ch->dma->dmatab; 225 226 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE); 227 228 if (bus_dmamap_load(ch->dma->ddmatag, ch->dma->ddmamap, data, count, 229 ata_dmasetupd_cb, &cba, 0) || cba.error) 230 return -1; 231 232 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 233 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 234 235 ch->dma->cur_iosize = count; 236 ch->dma->flags = dir ? (ATA_DMA_ACTIVE | ATA_DMA_READ) : ATA_DMA_ACTIVE; 237 238 return 0; 239 } 240 241 int 242 ata_dmaunload(struct ata_channel *ch) 243 { 244 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_POSTWRITE); 245 246 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 247 (ch->dma->flags & ATA_DMA_READ) != 0 ? 248 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 249 bus_dmamap_unload(ch->dma->ddmatag, ch->dma->ddmamap); 250 251 ch->dma->cur_iosize = 0; 252 ch->dma->flags = 0; 253 254 return 0; 255 } 256