ata-dma.c revision 121310
1214571Sdim/*- 2214571Sdim * Copyright (c) 1998 - 2003 S�ren Schmidt <sos@FreeBSD.org> 3214571Sdim * All rights reserved. 4214571Sdim * 5214571Sdim * Redistribution and use in source and binary forms, with or without 6214571Sdim * modification, are permitted provided that the following conditions 7214571Sdim * are met: 8214571Sdim * 1. Redistributions of source code must retain the above copyright 9214571Sdim * notice, this list of conditions and the following disclaimer, 10214571Sdim * without modification, immediately at the beginning of the file. 11214571Sdim * 2. Redistributions in binary form must reproduce the above copyright 12214571Sdim * notice, this list of conditions and the following disclaimer in the 13214571Sdim * documentation and/or other materials provided with the distribution. 14214571Sdim * 3. The name of the author may not be used to endorse or promote products 15214571Sdim * derived from this software without specific prior written permission. 16214571Sdim * 17214571Sdim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18214571Sdim * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19214571Sdim * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20214571Sdim * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21214571Sdim * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22214571Sdim * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23214571Sdim * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24214571Sdim * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25214571Sdim * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26214571Sdim * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27214571Sdim */ 28214571Sdim 29214571Sdim#include <sys/cdefs.h> 30214571Sdim__FBSDID("$FreeBSD: head/sys/dev/ata/ata-dma.c 121310 2003-10-21 19:20:37Z sos $"); 31214571Sdim 32214571Sdim#include <sys/param.h> 33214571Sdim#include <sys/systm.h> 34214571Sdim#include <sys/ata.h> 35214571Sdim#include <sys/kernel.h> 36214571Sdim#include <sys/endian.h> 37214571Sdim#include <sys/malloc.h> 38214571Sdim#include <sys/lock.h> 39214571Sdim#include <sys/mutex.h> 40214571Sdim#include <sys/taskqueue.h> 41214571Sdim#include <sys/bus.h> 42214571Sdim#include <machine/bus.h> 43214571Sdim#include <sys/rman.h> 44214571Sdim#include <dev/pci/pcivar.h> 45214571Sdim#include <dev/ata/ata-all.h> 46214571Sdim#include <dev/ata/ata-pci.h> 47214571Sdim 48214571Sdim/* prototypes */ 49214571Sdimstatic void ata_dmaalloc(struct ata_channel *); 50214571Sdimstatic void ata_dmafree(struct ata_channel *); 51214571Sdimstatic void ata_dmasetupd_cb(void *, bus_dma_segment_t *, int, int); 52214571Sdimstatic int ata_dmaload(struct ata_device *, caddr_t, int32_t, int); 53214571Sdimstatic int ata_dmaunload(struct ata_channel *); 54214571Sdim 55214571Sdim/* local vars */ 56214571Sdimstatic MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA"); 57214571Sdim 58214571Sdim/* misc defines */ 59214571Sdim#define MAXSEGSZ PAGE_SIZE 60214571Sdim#define MAXTABSZ PAGE_SIZE 61214571Sdim#define MAXCTLDMASZ (2 * (MAXTABSZ + MAXPHYS)) 62214571Sdim 63214571Sdimstruct ata_dc_cb_args { 64214571Sdim bus_addr_t maddr; 65214571Sdim int error; 66214571Sdim}; 67214571Sdim 68214571Sdimvoid 69214571Sdimata_dmainit(struct ata_channel *ch) 70214571Sdim{ 71214571Sdim if ((ch->dma = malloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) { 72214571Sdim ch->dma->alloc = ata_dmaalloc; 73214571Sdim ch->dma->free = ata_dmafree; 74214571Sdim ch->dma->load = ata_dmaload; 75214571Sdim ch->dma->unload = ata_dmaunload; 76214571Sdim ch->dma->alignment = 2; 77214571Sdim ch->dma->max_iosize = 64*1024; 78214571Sdim } 79214571Sdim} 80214571Sdim 81214571Sdim 82214571Sdimstatic void 83214571Sdimata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 84214571Sdim{ 85214571Sdim struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc; 86214571Sdim 87214571Sdim if (!(cba->error = error)) 88214571Sdim cba->maddr = segs[0].ds_addr; 89214571Sdim} 90214571Sdim 91214571Sdimstatic void 92214571Sdimata_dmaalloc(struct ata_channel *ch) 93214571Sdim{ 94214571Sdim struct ata_dc_cb_args ccba; 95214571Sdim 96214571Sdim if (bus_dma_tag_create(NULL, 1, 0, 97214571Sdim BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 98214571Sdim NULL, NULL, MAXCTLDMASZ, 99214571Sdim ATA_DMA_ENTRIES, BUS_SPACE_MAXSIZE_32BIT, 100214571Sdim BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->dmatag)) 101214571Sdim goto error; 102214571Sdim 103214571Sdim if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE, 104214571Sdim BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 105214571Sdim NULL, NULL, MAXTABSZ, 1, MAXTABSZ, 106214571Sdim BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->cdmatag)) 107214571Sdim goto error; 108214571Sdim 109214571Sdim if (bus_dma_tag_create(ch->dma->dmatag, ch->dma->alignment, 64*1024, 110214571Sdim BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, 111214571Sdim NULL, NULL, MAXPHYS, ATA_DMA_ENTRIES, MAXSEGSZ, 112214571Sdim BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->ddmatag)) 113214571Sdim goto error; 114214571Sdim 115214571Sdim if (bus_dmamem_alloc(ch->dma->cdmatag, (void **)&ch->dma->dmatab, 0, 116214571Sdim &ch->dma->cdmamap)) 117214571Sdim goto error; 118214571Sdim 119214571Sdim if (bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, ch->dma->dmatab, 120214571Sdim MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) { 121214571Sdim bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab,ch->dma->cdmamap); 122214571Sdim goto error; 123214571Sdim } 124214571Sdim ch->dma->mdmatab = ccba.maddr; 125214571Sdim if (bus_dmamap_create(ch->dma->ddmatag, 0, &ch->dma->ddmamap)) 126214571Sdim goto error; 127214571Sdim return; 128214571Sdim 129214571Sdimerror: 130214571Sdim ata_printf(ch, -1, "WARNING - DMA tag allocation failed, disabling DMA\n"); 131214571Sdim ata_dmafree(ch); 132214571Sdim free(ch->dma, M_ATADMA); 133214571Sdim ch->dma = NULL; 134214571Sdim} 135214571Sdim 136214571Sdimstatic void 137214571Sdimata_dmafree(struct ata_channel *ch) 138214571Sdim{ 139214571Sdim if (ch->dma->mdmatab) { 140214571Sdim bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap); 141214571Sdim bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap); 142214571Sdim ch->dma->mdmatab = 0; 143214571Sdim ch->dma->cdmamap = NULL; 144214571Sdim ch->dma->dmatab = NULL; 145214571Sdim } 146214571Sdim if (ch->dma->ddmamap) { 147214571Sdim bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap); 148214571Sdim ch->dma->ddmamap = NULL; 149214571Sdim } 150214571Sdim if (ch->dma->cdmatag) { 151214571Sdim bus_dma_tag_destroy(ch->dma->cdmatag); 152214571Sdim ch->dma->cdmatag = NULL; 153214571Sdim } 154214571Sdim if (ch->dma->ddmatag) { 155214571Sdim bus_dma_tag_destroy(ch->dma->ddmatag); 156214571Sdim ch->dma->ddmatag = NULL; 157214571Sdim } 158214571Sdim if (ch->dma->dmatag) { 159214571Sdim bus_dma_tag_destroy(ch->dma->dmatag); 160214571Sdim ch->dma->dmatag = NULL; 161214571Sdim } 162214571Sdim} 163214571Sdim 164214571Sdimstruct ata_dmasetup_data_cb_args { 165214571Sdim struct ata_dmaentry *dmatab; 166214571Sdim int error; 167214571Sdim}; 168214571Sdim 169214571Sdimstatic void 170214571Sdimata_dmasetupd_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error) 171214571Sdim{ 172214571Sdim struct ata_dmasetup_data_cb_args *cba = 173214571Sdim (struct ata_dmasetup_data_cb_args *)xsc; 174214571Sdim bus_size_t cnt; 175214571Sdim u_int32_t lastcount; 176214571Sdim int i, j; 177214571Sdim 178214571Sdim cba->error = error; 179214571Sdim if (error != 0) 180214571Sdim return; 181214571Sdim lastcount = j = 0; 182214571Sdim for (i = 0; i < nsegs; i++) { 183214571Sdim /* 184214571Sdim * A maximum segment size was specified for bus_dma_tag_create, but 185214571Sdim * some busdma code does not seem to honor this, so fix up if needed. 186214571Sdim */ 187214571Sdim for (cnt = 0; cnt < segs[i].ds_len; cnt += MAXSEGSZ, j++) { 188214571Sdim cba->dmatab[j].base = htole32(segs[i].ds_addr + cnt); 189214571Sdim lastcount = ulmin(segs[i].ds_len - cnt, MAXSEGSZ) & 0xffff; 190214571Sdim cba->dmatab[j].count = htole32(lastcount); 191214571Sdim } 192214571Sdim } 193214571Sdim cba->dmatab[j - 1].count = htole32(lastcount | ATA_DMA_EOT); 194214571Sdim} 195214571Sdim 196214571Sdimstatic int 197214571Sdimata_dmaload(struct ata_device *atadev, caddr_t data, int32_t count, int dir) 198214571Sdim{ 199214571Sdim struct ata_channel *ch = atadev->channel; 200214571Sdim struct ata_dmasetup_data_cb_args cba; 201214571Sdim 202214571Sdim if (ch->dma->flags & ATA_DMA_ACTIVE) { 203214571Sdim ata_prtdev(atadev, "FAILURE - already active DMA on this device\n"); 204214571Sdim return -1; 205214571Sdim } 206214571Sdim if (!count) { 207214571Sdim ata_prtdev(atadev, "FAILURE - zero length DMA transfer attempted\n"); 208214571Sdim return -1; 209214571Sdim } 210214571Sdim if (((uintptr_t)data & (ch->dma->alignment - 1)) || 211214571Sdim (count & (ch->dma->alignment - 1))) { 212214571Sdim ata_prtdev(atadev, "FAILURE - non aligned DMA transfer attempted\n"); 213214571Sdim return -1; 214214571Sdim } 215214571Sdim if (count > ch->dma->max_iosize) { 216214571Sdim ata_prtdev(atadev, 217214571Sdim "FAILURE - oversized DMA transfer attempted %d > %d\n", 218214571Sdim count, ch->dma->max_iosize); 219214571Sdim return -1; 220214571Sdim } 221214571Sdim 222214571Sdim cba.dmatab = ch->dma->dmatab; 223214571Sdim 224214571Sdim bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE); 225214571Sdim 226214571Sdim if (bus_dmamap_load(ch->dma->ddmatag, ch->dma->ddmamap, data, count, 227214571Sdim ata_dmasetupd_cb, &cba, 0) || cba.error) 228214571Sdim return -1; 229214571Sdim 230214571Sdim bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 231214571Sdim dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); 232214571Sdim 233214571Sdim ch->dma->cur_iosize = count; 234214571Sdim ch->dma->flags = dir ? (ATA_DMA_ACTIVE | ATA_DMA_READ) : ATA_DMA_ACTIVE; 235214571Sdim 236214571Sdim return 0; 237214571Sdim} 238214571Sdim 239214571Sdimint 240214571Sdimata_dmaunload(struct ata_channel *ch) 241214571Sdim{ 242214571Sdim bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_POSTWRITE); 243214571Sdim 244214571Sdim bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap, 245214571Sdim (ch->dma->flags & ATA_DMA_READ) != 0 ? 246214571Sdim BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 247214571Sdim bus_dmamap_unload(ch->dma->ddmatag, ch->dma->ddmamap); 248214571Sdim 249214571Sdim ch->dma->cur_iosize = 0; 250214571Sdim ch->dma->flags = 0; 251214571Sdim 252214571Sdim return 0; 253214571Sdim} 254214571Sdim