ata-dma.c revision 119453
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: head/sys/dev/ata/ata-dma.c 119453 2003-08-25 11:13:04Z sos $"); 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 */ 49static void ata_dmaalloc(struct ata_channel *); 50static void ata_dmafree(struct ata_channel *); 51static void ata_dmasetupd_cb(void *, bus_dma_segment_t *, int, int); 52static int ata_dmasetup(struct ata_device *, caddr_t, int32_t); 53 54/* local vars */ 55static MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA"); 56 57/* misc defines */ 58#define MAXSEGSZ PAGE_SIZE 59#define MAXTABSZ PAGE_SIZE 60#define MAXCTLDMASZ (2 * (MAXTABSZ + MAXPHYS)) 61 62struct ata_dc_cb_args { 63 bus_addr_t maddr; 64 int error; 65}; 66 67void 68ata_dmainit(struct ata_channel *ch) 69{ 70 if ((ch->dma = malloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) { 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->alignment = 2; 77 ch->dma->max_iosize = 64*1024; 78 } 79} 80 81 82static void 83ata_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 91static void 92ata_dmaalloc(struct ata_channel *ch) 93{ 94 struct ata_dc_cb_args ccba; 95 96 if (bus_dma_tag_create(NULL, 1, 0, BUS_SPACE_MAXADDR_32BIT, 97 BUS_SPACE_MAXADDR, NULL, NULL, MAXCTLDMASZ, 98 ATA_DMA_ENTRIES, BUS_SPACE_MAXSIZE_32BIT, 0, 99 NULL, NULL, &ch->dma->dmatag)) 100 goto error; 101 102 if (bus_dma_tag_create(ch->dma->dmatag, 1, PAGE_SIZE, 103 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 104 NULL, NULL, MAXTABSZ, 1, MAXTABSZ, BUS_DMA_ALLOCNOW, 105 NULL, NULL, &ch->dma->cdmatag)) 106 goto error; 107 108 if (bus_dma_tag_create(ch->dma->dmatag, ch->dma->alignment, 0, 109 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 110 NULL, NULL, MAXPHYS, ATA_DMA_ENTRIES, MAXSEGSZ, 111 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->ddmatag)) 112 goto error; 113 114 if (bus_dmamem_alloc(ch->dma->cdmatag, (void **)&ch->dma->dmatab, 0, 115 &ch->dma->cdmamap)) 116 goto error; 117 118 if (bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, ch->dma->dmatab, 119 MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 120 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab,ch->dma->cdmamap); 121 goto error; 122 } 123 ch->dma->mdmatab = ccba.maddr; 124 if (bus_dmamap_create(ch->dma->ddmatag, 0, &ch->dma->ddmamap)) 125 goto error; 126 return; 127 128error: 129 ata_printf(ch, -1, "WARNING - DMA tag allocation failed, disabling DMA\n"); 130 ata_dmafree(ch); 131 free(ch->dma, M_ATADMA); 132 ch->dma = NULL; 133} 134 135static void 136ata_dmafree(struct ata_channel *ch) 137{ 138 if (ch->dma->mdmatab) { 139 bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap); 140 bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 141 ch->dma->mdmatab = 0; 142 ch->dma->cdmamap = NULL; 143 ch->dma->dmatab = NULL; 144 } 145 if (ch->dma->ddmamap) { 146 bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap); 147 ch->dma->ddmamap = NULL; 148 } 149 if (ch->dma->cdmatag) { 150 bus_dma_tag_destroy(ch->dma->cdmatag); 151 ch->dma->cdmatag = NULL; 152 } 153 if (ch->dma->ddmatag) { 154 bus_dma_tag_destroy(ch->dma->ddmatag); 155 ch->dma->ddmatag = NULL; 156 } 157 if (ch->dma->dmatag) { 158 bus_dma_tag_destroy(ch->dma->dmatag); 159 ch->dma->dmatag = NULL; 160 } 161} 162 163struct ata_dmasetup_data_cb_args { 164 struct ata_dmaentry *dmatab; 165 int error; 166}; 167 168static void 169ata_dmasetupd_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 170{ 171 struct ata_dmasetup_data_cb_args *cba = 172 (struct ata_dmasetup_data_cb_args *)xsc; 173 bus_size_t cnt; 174 u_int32_t lastcount; 175 int i, j; 176 177 cba->error = error; 178 if (error != 0) 179 return; 180 lastcount = j = 0; 181 for (i = 0; i < nsegs; i++) { 182 /* 183 * A maximum segment size was specified for bus_dma_tag_create, but 184 * some busdma code does not seem to honor this, so fix up if needed. 185 */ 186 for (cnt = 0; cnt < segs[i].ds_len; cnt += MAXSEGSZ, j++) { 187 cba->dmatab[j].base = htole32(segs[i].ds_addr + cnt); 188 lastcount = ulmin(segs[i].ds_len - cnt, MAXSEGSZ) & 0xffff; 189 cba->dmatab[j].count = htole32(lastcount); 190 } 191 } 192 cba->dmatab[j - 1].count = htole32(lastcount | ATA_DMA_EOT); 193} 194 195static int 196ata_dmasetup(struct ata_device *atadev, caddr_t data, int32_t count) 197{ 198 struct ata_channel *ch = atadev->channel; 199 200 if (((uintptr_t)data & (ch->dma->alignment - 1)) || 201 (count & (ch->dma->alignment - 1))) { 202 ata_prtdev(atadev, "FAILURE - non aligned DMA transfer attempted\n"); 203 return -1; 204 } 205 if (!count) { 206 ata_prtdev(atadev, "FAILURE - zero length DMA transfer attempted\n"); 207 return -1; 208 } 209 if (count > ch->dma->max_iosize) { 210 ata_prtdev(atadev, 211 "FAILURE - oversized DMA transfer attempted %d > %d\n", 212 count, ch->dma->max_iosize); 213 return -1; 214 } 215 return 0; 216} 217 218int 219ata_dmastart(struct ata_channel *ch, caddr_t data, int32_t count, int dir) 220{ 221 struct ata_dmasetup_data_cb_args cba; 222 223 if (ch->dma->flags & ATA_DMA_ACTIVE) 224 panic("ata_dmasetup: transfer active on this device!"); 225 226 cba.dmatab = ch->dma->dmatab; 227 bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE); 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->flags = dir ? (ATA_DMA_ACTIVE | ATA_DMA_READ) : ATA_DMA_ACTIVE; 236 return 0; 237} 238 239int 240ata_dmastop(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->flags = 0; 250 return 0; 251} 252