sys/dev/disk/nata/ata-dma.c

   1 /*-
   2  * Copyright (c) 1998 - 2006 Søren 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  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/dev/ata/ata-dma.c,v 1.141 2006/01/05 21:27:19 sos Exp $
  27  * $DragonFly: src/sys/dev/disk/nata/ata-dma.c,v 1.2 2007/06/01 00:31:15 dillon Exp $
  28  */
  29
  30 #include "opt_ata.h"
  31
  32 #include <sys/param.h>
  33 #include <sys/bus.h>
  34 #include <sys/bus_dma.h>
  35 #include <sys/endian.h>
  36 #include <sys/malloc.h>
  37 #include <sys/nata.h>
  38
  39 #include <machine/bus_dma.h>
  40
  41 #include "ata-all.h"
  42 #include "ata-pci.h"
  43 #include "ata_if.h"
  44
  45 /* prototypes */
  46 static void ata_dmaalloc(device_t);
  47 static void ata_dmafree(device_t);
  48 static void ata_dmasetprd(void *, bus_dma_segment_t *, int, int);
  49 static int ata_dmaload(device_t, caddr_t, int32_t, int, void *, int *);
  50 static int ata_dmaunload(device_t);
  51
  52 /* local vars */
  53 static MALLOC_DEFINE(M_ATADMA, "ata_dma", "ATA driver DMA");
  54
  55 /* misc defines */
  56 #define MAXTABSZ        PAGE_SIZE
  57 #define MAXWSPCSZ       PAGE_SIZE*2
  58
  59 struct ata_dc_cb_args {
  60     bus_addr_t maddr;
  61     int error;
  62 };
  63
  64 void
  65 ata_dmainit(device_t dev)
  66 {
  67     struct ata_channel *ch = device_get_softc(dev);
  68
  69     if ((ch->dma = kmalloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) {
  70         ch->dma->alloc = ata_dmaalloc;
  71         ch->dma->free = ata_dmafree;
  72         ch->dma->setprd = ata_dmasetprd;
  73         ch->dma->load = ata_dmaload;
  74         ch->dma->unload = ata_dmaunload;
  75         ch->dma->alignment = 2;
  76         ch->dma->boundary = 128 * DEV_BSIZE;
  77         ch->dma->segsize = 128 * DEV_BSIZE;
  78         ch->dma->max_iosize = 128 * DEV_BSIZE;
  79         ch->dma->max_address = BUS_SPACE_MAXADDR_32BIT;
  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(device_t dev)
  94 {
  95     struct ata_channel *ch = device_get_softc(dev);
  96     struct ata_dc_cb_args ccba;
  97
  98     if (bus_dma_tag_create(NULL, ch->dma->alignment, 0,
  99                            ch->dma->max_address, BUS_SPACE_MAXADDR,
 100                            NULL, NULL, ch->dma->max_iosize,
 101                            ATA_DMA_ENTRIES, ch->dma->segsize,
 102                            0, &ch->dma->dmatag))
 103         goto error;
 104
 105     if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE,
 106                            ch->dma->max_address, BUS_SPACE_MAXADDR,
 107                            NULL, NULL, MAXTABSZ, 1, MAXTABSZ,
 108                            0, &ch->dma->sg_tag))
 109         goto error;
 110
 111     if (bus_dma_tag_create(ch->dma->dmatag,ch->dma->alignment,ch->dma->boundary,
 112                            ch->dma->max_address, BUS_SPACE_MAXADDR,
 113                            NULL, NULL, ch->dma->max_iosize,
 114                            ATA_DMA_ENTRIES, ch->dma->segsize,
 115                            0, &ch->dma->data_tag))
 116         goto error;
 117
 118     if (bus_dmamem_alloc(ch->dma->sg_tag, (void **)&ch->dma->sg, 0,
 119                          &ch->dma->sg_map))
 120         goto error;
 121
 122     if (bus_dmamap_load(ch->dma->sg_tag, ch->dma->sg_map, ch->dma->sg,
 123                         MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) {
 124         bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map);
 125         goto error;
 126     }
 127     ch->dma->sg_bus = ccba.maddr;
 128
 129     if (bus_dmamap_create(ch->dma->data_tag, 0, &ch->dma->data_map))
 130         goto error;
 131
 132     if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, 64 * 1024,
 133                            ch->dma->max_address, BUS_SPACE_MAXADDR,
 134                            NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ,
 135                            0, &ch->dma->work_tag))
 136         goto error;
 137
 138     if (bus_dmamem_alloc(ch->dma->work_tag, (void **)&ch->dma->work, 0,
 139                          &ch->dma->work_map))
 140         goto error;
 141
 142     if (bus_dmamap_load(ch->dma->work_tag, ch->dma->work_map,ch->dma->work,
 143                         MAXWSPCSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) {
 144         bus_dmamem_free(ch->dma->work_tag,ch->dma->work, ch->dma->work_map);
 145         goto error;
 146     }
 147     ch->dma->work_bus = ccba.maddr;
 148
 149     return;
 150
 151 error:
 152     device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n");
 153     ata_dmafree(dev);
 154     kfree(ch->dma, M_ATADMA);
 155     ch->dma = NULL;
 156 }
 157
 158 static void
 159 ata_dmafree(device_t dev)
 160 {
 161     struct ata_channel *ch = device_get_softc(dev);
 162
 163     if (ch->dma->work_bus) {
 164         bus_dmamap_unload(ch->dma->work_tag, ch->dma->work_map);
 165         bus_dmamem_free(ch->dma->work_tag, ch->dma->work, ch->dma->work_map);
 166         ch->dma->work_bus = 0;
 167         ch->dma->work_map = NULL;
 168         ch->dma->work = NULL;
 169     }
 170     if (ch->dma->work_tag) {
 171         bus_dma_tag_destroy(ch->dma->work_tag);
 172         ch->dma->work_tag = NULL;
 173     }
 174     if (ch->dma->sg_bus) {
 175         bus_dmamap_unload(ch->dma->sg_tag, ch->dma->sg_map);
 176         bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map);
 177         ch->dma->sg_bus = 0;
 178         ch->dma->sg_map = NULL;
 179         ch->dma->sg = NULL;
 180     }
 181     if (ch->dma->data_map) {
 182         bus_dmamap_destroy(ch->dma->data_tag, ch->dma->data_map);
 183         ch->dma->data_map = NULL;
 184     }
 185     if (ch->dma->sg_tag) {
 186         bus_dma_tag_destroy(ch->dma->sg_tag);
 187         ch->dma->sg_tag = NULL;
 188     }
 189     if (ch->dma->data_tag) {
 190         bus_dma_tag_destroy(ch->dma->data_tag);
 191         ch->dma->data_tag = NULL;
 192     }
 193     if (ch->dma->dmatag) {
 194         bus_dma_tag_destroy(ch->dma->dmatag);
 195         ch->dma->dmatag = NULL;
 196     }
 197 }
 198
 199 static void
 200 ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
 201 {
 202     struct ata_dmasetprd_args *args = xsc;
 203     struct ata_dma_prdentry *prd = args->dmatab;
 204     int i;
 205
 206     if ((args->error = error))
 207         return;
 208
 209     for (i = 0; i < nsegs; i++) {
 210         prd[i].addr = htole32(segs[i].ds_addr);
 211         prd[i].count = htole32(segs[i].ds_len);
 212     }
 213     prd[i - 1].count |= htole32(ATA_DMA_EOT);
 214     args->nsegs = nsegs;
 215 }
 216
 217 static int
 218 ata_dmaload(device_t dev, caddr_t data, int32_t count, int dir,
 219             void *addr, int *entries)
 220 {
 221     struct ata_channel *ch = device_get_softc(dev);
 222     struct ata_dmasetprd_args cba;
 223     int error;
 224
 225     if (ch->dma->flags & ATA_DMA_LOADED) {
 226         device_printf(dev, "FAILURE - already active DMA on this device\n");
 227         return EIO;
 228     }
 229     if (!count) {
 230         device_printf(dev, "FAILURE - zero length DMA transfer attempted\n");
 231         return EIO;
 232     }
 233     if (((uintptr_t)data & (ch->dma->alignment - 1)) ||
 234         (count & (ch->dma->alignment - 1))) {
 235         device_printf(dev, "FAILURE - non aligned DMA transfer attempted\n");
 236         return EIO;
 237     }
 238     if (count > ch->dma->max_iosize) {
 239         device_printf(dev, "FAILURE - oversized DMA transfer attempt %d > %d\n",
 240                       count, ch->dma->max_iosize);
 241         return EIO;
 242     }
 243
 244     cba.dmatab = addr;
 245
 246     if ((error = bus_dmamap_load(ch->dma->data_tag, ch->dma->data_map,
 247                                  data, count, ch->dma->setprd, &cba,
 248                                  BUS_DMA_NOWAIT)) || (error = cba.error))
 249         return error;
 250
 251     *entries = cba.nsegs;
 252
 253     bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, BUS_DMASYNC_PREWRITE);
 254
 255     bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map,
 256                     dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
 257
 258     ch->dma->cur_iosize = count;
 259     ch->dma->flags = dir ? (ATA_DMA_LOADED | ATA_DMA_READ) : ATA_DMA_LOADED;
 260     return 0;
 261 }
 262
 263 int
 264 ata_dmaunload(device_t dev)
 265 {
 266     struct ata_channel *ch = device_get_softc(dev);
 267
 268     if (ch->dma->flags & ATA_DMA_LOADED) {
 269         bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map,
 270                         BUS_DMASYNC_POSTWRITE);
 271
 272         bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map,
 273                         (ch->dma->flags & ATA_DMA_READ) ?
 274                         BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
 275         bus_dmamap_unload(ch->dma->data_tag, ch->dma->data_map);
 276
 277         ch->dma->cur_iosize = 0;
 278         ch->dma->flags &= ~ATA_DMA_LOADED;
 279     }
 280     return 0;
 281 }