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/bus.h> 38 #include <pci/pcivar.h> 39 #include <machine/bus.h> 40 #include <sys/rman.h> 41 #include <dev/ata/ata-all.h> 42 #include <dev/ata/ata-pci.h> 43 44 /* prototypes */ 45 static void ata_dmasetupc_cb(void *, bus_dma_segment_t *, int, int); 46 static int ata_dmaalloc(struct ata_channel *); 47 static void ata_dmafree(struct ata_channel *); 48 static void ata_dmasetupd_cb(void *, bus_dma_segment_t *, int, int); 49 static int ata_dmasetup(struct ata_device *, caddr_t, int32_t); 50 static int ata_dmastatus(struct ata_channel *); 51 52 /* local vars */ 53 static MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA"); 54 55 /* misc defines */ 56 #define MAXSEGSZ PAGE_SIZE 57 #define MAXTABSZ PAGE_SIZE 58 #define MAXCTLDMASZ (2 * (MAXTABSZ + MAXPHYS)) 59 60 struct ata_dc_cb_args { 61 bus_addr_t maddr; 62 int error; 63 }; 64 65 int 66 ata_dmainit(struct ata_channel *ch) 67 { 68 if (!(ch->dma = 69 malloc(sizeof(struct ata_dma_data), M_ATADMA, M_NOWAIT | M_ZERO))) 70 return ENOMEM; 71 ch->dma->alloc = ata_dmaalloc; 72 ch->dma->free = ata_dmafree; 73 ch->dma->setup = ata_dmasetup; 74 ch->dma->start = ata_dmastart; 75 ch->dma->stop = ata_dmastop; 76 ch->dma->status = ata_dmastatus; 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, &ch->dma->dmatag)) { 102 printf("DMA tag allocation failed, disabling DMA\n"); 103 } 104 } 105 if (!ch->dma->cdmatag) { 106 if ((error = bus_dma_tag_create(ch->dma->dmatag, 1, PAGE_SIZE, 107 BUS_SPACE_MAXADDR_32BIT, 108 BUS_SPACE_MAXADDR, NULL, NULL, 109 MAXTABSZ, 1, MAXTABSZ, 110 BUS_DMA_ALLOCNOW, &ch->dma->cdmatag))) 111 return error; 112 } 113 if (!ch->dma->ddmatag) { 114 if ((error = bus_dma_tag_create(ch->dma->dmatag, ch->dma->alignment, 0, 115 BUS_SPACE_MAXADDR_32BIT, 116 BUS_SPACE_MAXADDR, NULL, NULL, 117 MAXPHYS, ATA_DMA_ENTRIES, MAXSEGSZ, 118 BUS_DMA_ALLOCNOW, &ch->dma->ddmatag))) 119 return error; 120 } 121 if (!ch->dma->mdmatab) { 122 if ((error = bus_dmamem_alloc(ch->dma->cdmatag, 123 (void **)&ch->dma->dmatab, 0, 124 &ch->dma->cdmamap))) 125 return error; 126 127 if ((error = bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, 128 ch->dma->dmatab, MAXTABSZ, 129 ata_dmasetupc_cb, &ccba, 0)) != 0 || 130 ccba.error != 0) { 131 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab,ch->dma->cdmamap); 132 return error; 133 } 134 ch->dma->mdmatab = ccba.maddr; 135 } 136 if (!ch->dma->ddmamap) { 137 if ((error = bus_dmamap_create(ch->dma->ddmatag, 0, 138 &ch->dma->ddmamap)) != 0) 139 return error; 140 } 141 return 0; 142 } 143 144 static void 145 ata_dmafree(struct ata_channel *ch) 146 { 147 if (ch->dma->mdmatab) { 148 bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap); 149 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 150 ch->dma->mdmatab = 0; 151 ch->dma->cdmamap = NULL; 152 ch->dma->dmatab = NULL; 153 } 154 if (ch->dma->ddmamap) { 155 bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap); 156 ch->dma->ddmamap = NULL; 157 } 158 if (ch->dma->cdmatag) { 159 bus_dma_tag_destroy(ch->dma->cdmatag); 160 ch->dma->cdmatag = NULL; 161 } 162 if (ch->dma->ddmatag) { 163 bus_dma_tag_destroy(ch->dma->ddmatag); 164 ch->dma->ddmatag = NULL; 165 } 166 if (ch->dma->dmatag) { 167 bus_dma_tag_destroy(ch->dma->dmatag); 168 ch->dma->dmatag = NULL; 169 } 170 } 171 172 struct ata_dmasetup_data_cb_args { 173 struct ata_dmaentry *dmatab; 174 int error; 175 }; 176 177 static void 178 ata_dmasetupd_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 179 { 180 struct ata_dmasetup_data_cb_args *cba = 181 (struct ata_dmasetup_data_cb_args *)xsc; 182 bus_size_t cnt; 183 u_int32_t lastcount; 184 int i, j; 185 186 cba->error = error; 187 if (error != 0) 188 return; 189 lastcount = j = 0; 190 for (i = 0; i < nsegs; i++) { 191 /* 192 * A maximum segment size was specified for bus_dma_tag_create, but 193 * some busdma code does not seem to honor this, so fix up if needed. 194 */ 195 for (cnt = 0; cnt < segs[i].ds_len; cnt += MAXSEGSZ, j++) { 196 cba->dmatab[j].base = htole32(segs[i].ds_addr + cnt); 197 lastcount = ulmin(segs[i].ds_len - cnt, MAXSEGSZ) & 0xffff; 198 cba->dmatab[j].count = htole32(lastcount); 199 } 200 } 201 cba->dmatab[j - 1].count = htole32(lastcount | ATA_DMA_EOT); 202 } 203 204 static int 205 ata_dmasetup(struct ata_device *atadev, caddr_t data, int32_t count) 206 { 207 struct ata_channel *ch = atadev->channel; 208 209 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 210 (count & (ch->dma->alignment - 1))) { 211 ata_prtdev(atadev, "non aligned DMA transfer attempted\n"); 212 return -1; 213 } 214 215 if (!count) { 216 ata_prtdev(atadev, "zero length DMA transfer attempted\n"); 217 return -1; 218 } 219 return 0; 220 } 221 222 static int 223 ata_dmastatus(struct ata_channel *ch) 224 { 225 return ch->dma->flags & ATA_DMA_ACTIVE; 226 } 227 228 int 229 ata_dmastart(struct ata_channel *ch, caddr_t data, int32_t count, int dir) 230 { 231 struct ata_dmasetup_data_cb_args cba; 232 233 if (ch->dma->flags & ATA_DMA_ACTIVE) 234 panic("ata_dmasetup: transfer active on this device!"); 235 236 cba.dmatab = ch->dma->dmatab; 237 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE); 238 239 if (bus_dmamap_load(ch->dma->ddmatag, ch->dma->ddmamap, data, count, 240 ata_dmasetupd_cb, &cba, 0) || cba.error) 241 return -1; 242 243 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_POSTWRITE); 244 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 245 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 246 247 ch->dma->flags = dir ? (ATA_DMA_ACTIVE | ATA_DMA_READ) : ATA_DMA_ACTIVE; 248 return 0; 249 } 250 251 int 252 ata_dmastop(struct ata_channel *ch) 253 { 254 bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 255 (ch->dma->flags & ATA_DMA_READ) != 0 ? 256 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 257 bus_dmamap_unload(ch->dma->ddmatag, ch->dma->ddmamap); 258 ch->dma->flags = 0; 259 return 0; 260 } 261