2 * Copyright (c) 1998 - 2005 Søren Schmidt <sos@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/endian.h>
37 #include <sys/malloc.h>
40 #include <sys/taskqueue.h>
43 #include <machine/bus.h>
45 #include <dev/pci/pcivar.h>
46 #include <dev/ata/ata-all.h>
47 #include <dev/ata/ata-pci.h>
50 static void ata_dmaalloc(device_t);
51 static void ata_dmafree(device_t);
52 static void ata_dmasetprd(void *, bus_dma_segment_t *, int, int);
53 static int ata_dmaload(device_t, caddr_t, int32_t, int, void *, int *);
54 static int ata_dmaunload(device_t);
57 static MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA");
60 #define MAXTABSZ PAGE_SIZE
61 #define MAXWSPCSZ PAGE_SIZE*2
63 struct ata_dc_cb_args {
69 ata_dmainit(device_t dev)
71 struct ata_channel *ch = device_get_softc(dev);
73 if ((ch->dma = malloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) {
74 ch->dma->alloc = ata_dmaalloc;
75 ch->dma->free = ata_dmafree;
76 ch->dma->setprd = ata_dmasetprd;
77 ch->dma->load = ata_dmaload;
78 ch->dma->unload = ata_dmaunload;
79 ch->dma->alignment = 2;
80 ch->dma->max_iosize = 128 * DEV_BSIZE;
81 ch->dma->boundary = 128 * DEV_BSIZE;
86 ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
88 struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc;
90 if (!(cba->error = error))
91 cba->maddr = segs[0].ds_addr;
95 ata_dmaalloc(device_t dev)
97 struct ata_channel *ch = device_get_softc(dev);
98 struct ata_dc_cb_args ccba;
100 if (bus_dma_tag_create(NULL, ch->dma->alignment, 0,
101 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
102 NULL, NULL, 256 * DEV_BSIZE,
103 ATA_DMA_ENTRIES, ch->dma->max_iosize,
104 0, NULL, NULL, &ch->dma->dmatag))
107 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE,
108 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
109 NULL, NULL, MAXTABSZ, 1, MAXTABSZ,
110 0, NULL, NULL, &ch->dma->sg_tag))
113 if (bus_dma_tag_create(ch->dma->dmatag,ch->dma->alignment,ch->dma->boundary,
114 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
115 NULL, NULL, 256 * DEV_BSIZE,
116 ATA_DMA_ENTRIES, ch->dma->max_iosize,
117 BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->data_tag))
120 if (bus_dmamem_alloc(ch->dma->sg_tag, (void **)&ch->dma->sg, 0,
124 if (bus_dmamap_load(ch->dma->sg_tag, ch->dma->sg_map, ch->dma->sg,
125 MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) {
126 bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map);
129 ch->dma->sg_bus = ccba.maddr;
131 if (bus_dmamap_create(ch->dma->data_tag, 0, &ch->dma->data_map))
134 if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, 64 * 1024,
135 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
136 NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ,
137 0, NULL, NULL, &ch->dma->work_tag))
140 if (bus_dmamem_alloc(ch->dma->work_tag, (void **)&ch->dma->work, 0,
144 if (bus_dmamap_load(ch->dma->work_tag, ch->dma->work_map,ch->dma->work,
145 MAXWSPCSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) {
146 bus_dmamem_free(ch->dma->work_tag,ch->dma->work, ch->dma->work_map);
149 ch->dma->work_bus = ccba.maddr;
154 device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n");
156 free(ch->dma, M_ATADMA);
161 ata_dmafree(device_t dev)
163 struct ata_channel *ch = device_get_softc(dev);
165 if (ch->dma->work_bus) {
166 bus_dmamap_unload(ch->dma->work_tag, ch->dma->work_map);
167 bus_dmamem_free(ch->dma->work_tag, ch->dma->work, ch->dma->work_map);
168 ch->dma->work_bus = 0;
169 ch->dma->work_map = NULL;
170 ch->dma->work = NULL;
172 if (ch->dma->work_tag) {
173 bus_dma_tag_destroy(ch->dma->work_tag);
174 ch->dma->work_tag = NULL;
176 if (ch->dma->sg_bus) {
177 bus_dmamap_unload(ch->dma->sg_tag, ch->dma->sg_map);
178 bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map);
180 ch->dma->sg_map = NULL;
183 if (ch->dma->data_map) {
184 bus_dmamap_destroy(ch->dma->data_tag, ch->dma->data_map);
185 ch->dma->data_map = NULL;
187 if (ch->dma->sg_tag) {
188 bus_dma_tag_destroy(ch->dma->sg_tag);
189 ch->dma->sg_tag = NULL;
191 if (ch->dma->data_tag) {
192 bus_dma_tag_destroy(ch->dma->data_tag);
193 ch->dma->data_tag = NULL;
195 if (ch->dma->dmatag) {
196 bus_dma_tag_destroy(ch->dma->dmatag);
197 ch->dma->dmatag = NULL;
202 ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
204 struct ata_dmasetprd_args *args = xsc;
205 struct ata_dma_prdentry *prd = args->dmatab;
208 if ((args->error = error))
211 for (i = 0; i < nsegs; i++) {
212 prd[i].addr = htole32(segs[i].ds_addr);
213 prd[i].count = htole32(segs[i].ds_len);
215 prd[i - 1].count |= htole32(ATA_DMA_EOT);
220 ata_dmaload(device_t dev, caddr_t data, int32_t count, int dir,
221 void *addr, int *entries)
223 struct ata_channel *ch = device_get_softc(dev);
224 struct ata_dmasetprd_args cba;
226 if (ch->dma->flags & ATA_DMA_LOADED) {
227 device_printf(dev, "FAILURE - already active DMA on this device\n");
231 device_printf(dev, "FAILURE - zero length DMA transfer attempted\n");
234 if (((uintptr_t)data & (ch->dma->alignment - 1)) ||
235 (count & (ch->dma->alignment - 1))) {
236 device_printf(dev, "FAILURE - non aligned DMA transfer attempted\n");
239 if (count > ch->dma->max_iosize) {
240 device_printf(dev, "FAILURE - oversized DMA transfer attempt %d > %d\n",
241 count, ch->dma->max_iosize);
247 if (bus_dmamap_load(ch->dma->data_tag, ch->dma->data_map, data, count,
248 ch->dma->setprd, &cba, 0) || cba.error)
251 *entries = cba.nsegs;
253 bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, BUS_DMASYNC_PREWRITE);
255 bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map,
256 dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
258 ch->dma->cur_iosize = count;
259 ch->dma->flags = dir ? (ATA_DMA_LOADED | ATA_DMA_READ) : ATA_DMA_LOADED;
264 ata_dmaunload(device_t dev)
266 struct ata_channel *ch = device_get_softc(dev);
268 if (ch->dma->flags & ATA_DMA_LOADED) {
269 bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map,
270 BUS_DMASYNC_POSTWRITE);
272 bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map,
273 (ch->dma->flags & ATA_DMA_READ) != 0 ?
274 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
275 bus_dmamap_unload(ch->dma->data_tag, ch->dma->data_map);
277 ch->dma->cur_iosize = 0;
278 ch->dma->flags &= ~ATA_DMA_LOADED;