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 MAXCTLDMASZ (2 * (MAXTABSZ + MAXPHYS)) 63 64 struct ata_dc_cb_args { 65 bus_addr_t maddr; 66 int error; 67 }; 68 69 void 70 ata_dmainit(struct ata_channel *ch) 71 { 72 if ((ch->dma = malloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) { 73 ch->dma->alloc = ata_dmaalloc; 74 ch->dma->free = ata_dmafree; 75 ch->dma->load = ata_dmaload; 76 ch->dma->unload = ata_dmaunload; 77 ch->dma->alignment = 2; 78 ch->dma->max_iosize = 64 * 1024; 79 ch->dma->boundary = 64 * 1024; 80 } 81 } 82 83 84 static void 85 ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 86 { 87 struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc; 88 89 if (!(cba->error = error)) 90 cba->maddr = segs[0].ds_addr; 91 } 92 93 static void 94 ata_dmaalloc(struct ata_channel *ch) 95 { 96 struct ata_dc_cb_args ccba; 97 98 if (bus_dma_tag_create(NULL, 1, 0, 99 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 100 NULL, NULL, MAXCTLDMASZ, 101 ATA_DMA_ENTRIES, BUS_SPACE_MAXSIZE_32BIT, 102 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->dmatag)) 103 goto error; 104 105 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 106 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 107 NULL, NULL, MAXTABSZ, 1, MAXTABSZ, 108 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->cdmatag)) 109 goto error; 110 111 if (bus_dma_tag_create(ch->dma->dmatag,ch->dma->alignment,ch->dma->boundary, 112 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 113 NULL, NULL, ch->dma->max_iosize, 114 ATA_DMA_ENTRIES, ch->dma->boundary, 115 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->ddmatag)) 116 goto error; 117 118 if (bus_dmamem_alloc(ch->dma->cdmatag, (void **)&ch->dma->dmatab, 0, 119 &ch->dma->cdmamap)) 120 goto error; 121 122 if (bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, ch->dma->dmatab, 123 MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 124 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab,ch->dma->cdmamap); 125 goto error; 126 } 127 ch->dma->mdmatab = ccba.maddr; 128 if (bus_dmamap_create(ch->dma->ddmatag, 0, &ch->dma->ddmamap)) 129 goto error; 130 return; 131 132 error: 133 ata_printf(ch, -1, "WARNING - DMA tag allocation failed, disabling DMA\n"); 134 ata_dmafree(ch); 135 free(ch->dma, M_ATADMA); 136 ch->dma = NULL; 137 } 138 139 static void 140 ata_dmafree(struct ata_channel *ch) 141 { 142 if (ch->dma->mdmatab) { 143 bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap); 144 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 145 ch->dma->mdmatab = 0; 146 ch->dma->cdmamap = NULL; 147 ch->dma->dmatab = NULL; 148 } 149 if (ch->dma->ddmamap) { 150 bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap); 151 ch->dma->ddmamap = NULL; 152 } 153 if (ch->dma->cdmatag) { 154 bus_dma_tag_destroy(ch->dma->cdmatag); 155 ch->dma->cdmatag = NULL; 156 } 157 if (ch->dma->ddmatag) { 158 bus_dma_tag_destroy(ch->dma->ddmatag); 159 ch->dma->ddmatag = NULL; 160 } 161 if (ch->dma->dmatag) { 162 bus_dma_tag_destroy(ch->dma->dmatag); 163 ch->dma->dmatag = NULL; 164 } 165 } 166 167 struct ata_dmasetup_data_cb_args { 168 struct ata_dmaentry *dmatab; 169 int error; 170 }; 171 172 static void 173 ata_dmasetupd_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 174 { 175 struct ata_dmasetup_data_cb_args *cba = 176 (struct ata_dmasetup_data_cb_args *)xsc; 177 bus_size_t cnt; 178 u_int32_t lastcount; 179 int i, j; 180 181 cba->error = error; 182 if (error != 0) 183 return; 184 lastcount = j = 0; 185 for (i = 0; i < nsegs; i++) { 186 /* 187 * A maximum segment size was specified for bus_dma_tag_create, but 188 * some busdma code does not seem to honor this, so fix up if needed. 189 */ 190 for (cnt = 0; cnt < segs[i].ds_len; cnt += MAXSEGSZ, j++) { 191 cba->dmatab[j].base = htole32(segs[i].ds_addr + cnt); 192 lastcount = ulmin(segs[i].ds_len - cnt, MAXSEGSZ) & 0xffff; 193 cba->dmatab[j].count = htole32(lastcount); 194 } 195 } 196 cba->dmatab[j - 1].count = htole32(lastcount | ATA_DMA_EOT); 197 } 198 199 static int 200 ata_dmaload(struct ata_device *atadev, caddr_t data, int32_t count, int dir) 201 { 202 struct ata_channel *ch = atadev->channel; 203 struct ata_dmasetup_data_cb_args cba; 204 205 if (ch->dma->flags & ATA_DMA_ACTIVE) { 206 ata_prtdev(atadev, "FAILURE - already active DMA on this device\n"); 207 return -1; 208 } 209 if (!count) { 210 ata_prtdev(atadev, "FAILURE - zero length DMA transfer attempted\n"); 211 return -1; 212 } 213 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 214 (count & (ch->dma->alignment - 1))) { 215 ata_prtdev(atadev, "FAILURE - non aligned DMA transfer attempted\n"); 216 return -1; 217 } 218 if (count > ch->dma->max_iosize) { 219 ata_prtdev(atadev, 220 "FAILURE - oversized DMA transfer attempted %d > %d\n", 221 count, ch->dma->max_iosize); 222 return -1; 223 } 224 225 cba.dmatab = ch->dma->dmatab; 226 227 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE); 228 229 if (bus_dmamap_load(ch->dma->ddmatag, ch->dma->ddmamap, data, count, 230 ata_dmasetupd_cb, &cba, 0) || cba.error) 231 return -1; 232 233 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 234 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 235 236 ch->dma->cur_iosize = count; 237 ch->dma->flags = dir ? (ATA_DMA_ACTIVE | ATA_DMA_READ) : ATA_DMA_ACTIVE; 238 239 return 0; 240 } 241 242 int 243 ata_dmaunload(struct ata_channel *ch) 244 { 245 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_POSTWRITE); 246 247 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 248 (ch->dma->flags & ATA_DMA_READ) != 0 ? 249 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 250 bus_dmamap_unload(ch->dma->ddmatag, ch->dma->ddmamap); 251 252 ch->dma->cur_iosize = 0; 253 ch->dma->flags = 0; 254 255 return 0; 256 } 257