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 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/ata.h> 34 #include <sys/kernel.h> 35 #include <sys/endian.h> 36 #include <sys/malloc.h> 37 #include <sys/lock.h> 38 #include <sys/mutex.h> 39 #include <sys/bus.h> 40 #include <pci/pcivar.h> 41 #include <machine/bus.h> 42 #include <sys/rman.h> 43 #include <dev/ata/ata-all.h> 44 #include <dev/ata/ata-pci.h> 45 46 /* prototypes */ 47 static void ata_dmasetupc_cb(void *, bus_dma_segment_t *, int, int); 48 static int ata_dmaalloc(struct ata_channel *); 49 static void ata_dmafree(struct ata_channel *); 50 static void ata_dmasetupd_cb(void *, bus_dma_segment_t *, int, int); 51 static int ata_dmasetup(struct ata_device *, caddr_t, int32_t); 52 53 /* local vars */ 54 static MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA"); 55 56 /* misc defines */ 57 #define MAXSEGSZ PAGE_SIZE 58 #define MAXTABSZ PAGE_SIZE 59 #define MAXCTLDMASZ (2 * (MAXTABSZ + MAXPHYS)) 60 61 struct ata_dc_cb_args { 62 bus_addr_t maddr; 63 int error; 64 }; 65 66 int 67 ata_dmainit(struct ata_channel *ch) 68 { 69 if (!(ch->dma = 70 malloc(sizeof(struct ata_dma_data), M_ATADMA, M_NOWAIT | M_ZERO))) 71 return ENOMEM; 72 ch->dma->alloc = ata_dmaalloc; 73 ch->dma->free = ata_dmafree; 74 ch->dma->setup = ata_dmasetup; 75 ch->dma->start = ata_dmastart; 76 ch->dma->stop = ata_dmastop; 77 ch->dma->alignment = 2; 78 return 0; 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 int 92 ata_dmaalloc(struct ata_channel *ch) 93 { 94 struct ata_dc_cb_args ccba; 95 int error; 96 97 if (!ch->dma->dmatag) { 98 if (bus_dma_tag_create(NULL, 1, 0, 99 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 100 NULL, NULL, MAXCTLDMASZ, ATA_DMA_ENTRIES, 101 BUS_SPACE_MAXSIZE_32BIT, 0, busdma_lock_mutex, 102 &Giant, &ch->dma->dmatag)) { 103 printf("DMA tag allocation failed, disabling DMA\n"); 104 } 105 } 106 if (!ch->dma->cdmatag) { 107 if ((error = bus_dma_tag_create(ch->dma->dmatag, 1, PAGE_SIZE, 108 BUS_SPACE_MAXADDR_32BIT, 109 BUS_SPACE_MAXADDR, NULL, NULL, 110 MAXTABSZ, 1, MAXTABSZ, 111 BUS_DMA_ALLOCNOW, busdma_lock_mutex, 112 &Giant, &ch->dma->cdmatag))) 113 return error; 114 } 115 if (!ch->dma->ddmatag) { 116 if ((error = bus_dma_tag_create(ch->dma->dmatag, ch->dma->alignment, 0, 117 BUS_SPACE_MAXADDR_32BIT, 118 BUS_SPACE_MAXADDR, NULL, NULL, 119 MAXPHYS, ATA_DMA_ENTRIES, MAXSEGSZ, 120 BUS_DMA_ALLOCNOW, busdma_lock_mutex, 121 &Giant, &ch->dma->ddmatag))) 122 return error; 123 } 124 if (!ch->dma->mdmatab) { 125 if ((error = bus_dmamem_alloc(ch->dma->cdmatag, 126 (void **)&ch->dma->dmatab, 0, 127 &ch->dma->cdmamap))) 128 return error; 129 130 if ((error = bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, 131 ch->dma->dmatab, MAXTABSZ, 132 ata_dmasetupc_cb, &ccba, 0)) != 0 || 133 ccba.error != 0) { 134 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab,ch->dma->cdmamap); 135 return error; 136 } 137 ch->dma->mdmatab = ccba.maddr; 138 } 139 if (!ch->dma->ddmamap) { 140 if ((error = bus_dmamap_create(ch->dma->ddmatag, 0, 141 &ch->dma->ddmamap)) != 0) 142 return error; 143 } 144 return 0; 145 } 146 147 static void 148 ata_dmafree(struct ata_channel *ch) 149 { 150 if (ch->dma->mdmatab) { 151 bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap); 152 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 153 ch->dma->mdmatab = 0; 154 ch->dma->cdmamap = NULL; 155 ch->dma->dmatab = NULL; 156 } 157 if (ch->dma->ddmamap) { 158 bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap); 159 ch->dma->ddmamap = NULL; 160 } 161 if (ch->dma->cdmatag) { 162 bus_dma_tag_destroy(ch->dma->cdmatag); 163 ch->dma->cdmatag = NULL; 164 } 165 if (ch->dma->ddmatag) { 166 bus_dma_tag_destroy(ch->dma->ddmatag); 167 ch->dma->ddmatag = NULL; 168 } 169 if (ch->dma->dmatag) { 170 bus_dma_tag_destroy(ch->dma->dmatag); 171 ch->dma->dmatag = NULL; 172 } 173 } 174 175 struct ata_dmasetup_data_cb_args { 176 struct ata_dmaentry *dmatab; 177 int error; 178 }; 179 180 static void 181 ata_dmasetupd_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 182 { 183 struct ata_dmasetup_data_cb_args *cba = 184 (struct ata_dmasetup_data_cb_args *)xsc; 185 bus_size_t cnt; 186 u_int32_t lastcount; 187 int i, j; 188 189 cba->error = error; 190 if (error != 0) 191 return; 192 lastcount = j = 0; 193 for (i = 0; i < nsegs; i++) { 194 /* 195 * A maximum segment size was specified for bus_dma_tag_create, but 196 * some busdma code does not seem to honor this, so fix up if needed. 197 */ 198 for (cnt = 0; cnt < segs[i].ds_len; cnt += MAXSEGSZ, j++) { 199 cba->dmatab[j].base = htole32(segs[i].ds_addr + cnt); 200 lastcount = ulmin(segs[i].ds_len - cnt, MAXSEGSZ) & 0xffff; 201 cba->dmatab[j].count = htole32(lastcount); 202 } 203 } 204 cba->dmatab[j - 1].count = htole32(lastcount | ATA_DMA_EOT); 205 } 206 207 static int 208 ata_dmasetup(struct ata_device *atadev, caddr_t data, int32_t count) 209 { 210 struct ata_channel *ch = atadev->channel; 211 212 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 213 (count & (ch->dma->alignment - 1))) { 214 ata_prtdev(atadev, "non aligned DMA transfer attempted\n"); 215 return -1; 216 } 217 218 if (!count) { 219 ata_prtdev(atadev, "zero length DMA transfer attempted\n"); 220 return -1; 221 } 222 return 0; 223 } 224 225 int 226 ata_dmastart(struct ata_channel *ch, caddr_t data, int32_t count, int dir) 227 { 228 struct ata_dmasetup_data_cb_args cba; 229 230 if (ch->dma->flags & ATA_DMA_ACTIVE) 231 panic("ata_dmasetup: transfer active on this device!"); 232 233 cba.dmatab = ch->dma->dmatab; 234 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE); 235 236 if (bus_dmamap_load(ch->dma->ddmatag, ch->dma->ddmamap, data, count, 237 ata_dmasetupd_cb, &cba, 0) || cba.error) 238 return -1; 239 240 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_POSTWRITE); 241 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 242 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 243 244 ch->dma->flags = dir ? (ATA_DMA_ACTIVE | ATA_DMA_READ) : ATA_DMA_ACTIVE; 245 return 0; 246 } 247 248 int 249 ata_dmastop(struct ata_channel *ch) 250 { 251 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 252 (ch->dma->flags & ATA_DMA_READ) != 0 ? 253 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 254 bus_dmamap_unload(ch->dma->ddmatag, ch->dma->ddmamap); 255 ch->dma->flags = 0; 256 return 0; 257 } 258