freebsd-dev/sys/dev/ata/ata-dma.c
2007-04-08 21:53:52 +00:00

284 lines
8.3 KiB
C

/*-
* Copyright (c) 1998 - 2007 Søren Schmidt <sos@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer,
* without modification, immediately at the beginning of the file.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ata.h>
#include <sys/kernel.h>
#include <sys/endian.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/sema.h>
#include <sys/taskqueue.h>
#include <vm/uma.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <dev/pci/pcivar.h>
#include <dev/ata/ata-all.h>
#include <dev/ata/ata-pci.h>
/* prototypes */
static void ata_dmaalloc(device_t);
static void ata_dmafree(device_t);
static void ata_dmasetprd(void *, bus_dma_segment_t *, int, int);
static int ata_dmaload(device_t, caddr_t, int32_t, int, void *, int *);
static int ata_dmaunload(device_t);
/* local vars */
static MALLOC_DEFINE(M_ATADMA, "ata_dma", "ATA driver DMA");
/* misc defines */
#define MAXTABSZ PAGE_SIZE
#define MAXWSPCSZ PAGE_SIZE*2
struct ata_dc_cb_args {
bus_addr_t maddr;
int error;
};
void
ata_dmainit(device_t dev)
{
struct ata_channel *ch = device_get_softc(dev);
if ((ch->dma = malloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) {
ch->dma->alloc = ata_dmaalloc;
ch->dma->free = ata_dmafree;
ch->dma->setprd = ata_dmasetprd;
ch->dma->load = ata_dmaload;
ch->dma->unload = ata_dmaunload;
ch->dma->alignment = 2;
ch->dma->boundary = 128 * DEV_BSIZE;
ch->dma->segsize = 128 * DEV_BSIZE;
ch->dma->max_iosize = 128 * DEV_BSIZE;
ch->dma->max_address = BUS_SPACE_MAXADDR_32BIT;
}
}
static void
ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
{
struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc;
if (!(cba->error = error))
cba->maddr = segs[0].ds_addr;
}
static void
ata_dmaalloc(device_t dev)
{
struct ata_channel *ch = device_get_softc(dev);
struct ata_dc_cb_args ccba;
if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma->alignment, 0,
ch->dma->max_address, BUS_SPACE_MAXADDR,
NULL, NULL, ch->dma->max_iosize,
ATA_DMA_ENTRIES, ch->dma->segsize,
0, NULL, NULL, &ch->dma->dmatag))
goto error;
if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE,
ch->dma->max_address, BUS_SPACE_MAXADDR,
NULL, NULL, MAXTABSZ, 1, MAXTABSZ,
0, NULL, NULL, &ch->dma->sg_tag))
goto error;
if (bus_dma_tag_create(ch->dma->dmatag,ch->dma->alignment,ch->dma->boundary,
ch->dma->max_address, BUS_SPACE_MAXADDR,
NULL, NULL, ch->dma->max_iosize,
ATA_DMA_ENTRIES, ch->dma->segsize,
0, NULL, NULL, &ch->dma->data_tag))
goto error;
if (bus_dmamem_alloc(ch->dma->sg_tag, (void **)&ch->dma->sg, 0,
&ch->dma->sg_map))
goto error;
if (bus_dmamap_load(ch->dma->sg_tag, ch->dma->sg_map, ch->dma->sg,
MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) {
bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map);
goto error;
}
ch->dma->sg_bus = ccba.maddr;
if (bus_dmamap_create(ch->dma->data_tag, 0, &ch->dma->data_map))
goto error;
if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, 64 * 1024,
ch->dma->max_address, BUS_SPACE_MAXADDR,
NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ,
0, NULL, NULL, &ch->dma->work_tag))
goto error;
if (bus_dmamem_alloc(ch->dma->work_tag, (void **)&ch->dma->work, 0,
&ch->dma->work_map))
goto error;
if (bus_dmamap_load(ch->dma->work_tag, ch->dma->work_map,ch->dma->work,
MAXWSPCSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) {
bus_dmamem_free(ch->dma->work_tag,ch->dma->work, ch->dma->work_map);
goto error;
}
ch->dma->work_bus = ccba.maddr;
return;
error:
device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n");
ata_dmafree(dev);
free(ch->dma, M_ATADMA);
ch->dma = NULL;
}
static void
ata_dmafree(device_t dev)
{
struct ata_channel *ch = device_get_softc(dev);
if (ch->dma->work_bus) {
bus_dmamap_unload(ch->dma->work_tag, ch->dma->work_map);
bus_dmamem_free(ch->dma->work_tag, ch->dma->work, ch->dma->work_map);
ch->dma->work_bus = 0;
ch->dma->work_map = NULL;
ch->dma->work = NULL;
}
if (ch->dma->work_tag) {
bus_dma_tag_destroy(ch->dma->work_tag);
ch->dma->work_tag = NULL;
}
if (ch->dma->sg_bus) {
bus_dmamap_unload(ch->dma->sg_tag, ch->dma->sg_map);
bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map);
ch->dma->sg_bus = 0;
ch->dma->sg_map = NULL;
ch->dma->sg = NULL;
}
if (ch->dma->data_map) {
bus_dmamap_destroy(ch->dma->data_tag, ch->dma->data_map);
ch->dma->data_map = NULL;
}
if (ch->dma->sg_tag) {
bus_dma_tag_destroy(ch->dma->sg_tag);
ch->dma->sg_tag = NULL;
}
if (ch->dma->data_tag) {
bus_dma_tag_destroy(ch->dma->data_tag);
ch->dma->data_tag = NULL;
}
if (ch->dma->dmatag) {
bus_dma_tag_destroy(ch->dma->dmatag);
ch->dma->dmatag = NULL;
}
}
static void
ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
{
struct ata_dmasetprd_args *args = xsc;
struct ata_dma_prdentry *prd = args->dmatab;
int i;
if ((args->error = error))
return;
for (i = 0; i < nsegs; i++) {
prd[i].addr = htole32(segs[i].ds_addr);
prd[i].count = htole32(segs[i].ds_len);
}
prd[i - 1].count |= htole32(ATA_DMA_EOT);
args->nsegs = nsegs;
}
static int
ata_dmaload(device_t dev, caddr_t data, int32_t count, int dir,
void *addr, int *entries)
{
struct ata_channel *ch = device_get_softc(dev);
struct ata_dmasetprd_args cba;
int error;
if (ch->dma->flags & ATA_DMA_LOADED) {
device_printf(dev, "FAILURE - already active DMA on this device\n");
return EIO;
}
if (!count) {
device_printf(dev, "FAILURE - zero length DMA transfer attempted\n");
return EIO;
}
if (((uintptr_t)data & (ch->dma->alignment - 1)) ||
(count & (ch->dma->alignment - 1))) {
device_printf(dev, "FAILURE - non aligned DMA transfer attempted\n");
return EIO;
}
if (count > ch->dma->max_iosize) {
device_printf(dev, "FAILURE - oversized DMA transfer attempt %d > %d\n",
count, ch->dma->max_iosize);
return EIO;
}
cba.dmatab = addr;
if ((error = bus_dmamap_load(ch->dma->data_tag, ch->dma->data_map,
data, count, ch->dma->setprd, &cba,
BUS_DMA_NOWAIT)) || (error = cba.error))
return error;
*entries = cba.nsegs;
bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, BUS_DMASYNC_PREWRITE);
bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map,
dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
ch->dma->cur_iosize = count;
ch->dma->flags = dir ? (ATA_DMA_LOADED | ATA_DMA_READ) : ATA_DMA_LOADED;
return 0;
}
int
ata_dmaunload(device_t dev)
{
struct ata_channel *ch = device_get_softc(dev);
if (ch->dma->flags & ATA_DMA_LOADED) {
bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map,
BUS_DMASYNC_POSTWRITE);
bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map,
(ch->dma->flags & ATA_DMA_READ) ?
BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(ch->dma->data_tag, ch->dma->data_map);
ch->dma->cur_iosize = 0;
ch->dma->flags &= ~ATA_DMA_LOADED;
}
return 0;
}