freebsd-dev/sys/dev/ata/ata-dma.c
Søren Schmidt 1b39bd2412 Third round of updates to the ATA driver.
More DMA cleanups, including fix for breakage on older Promise controllers.

Add more ways of getting to the ATA registers.
2003-04-07 14:12:12 +00:00

253 lines
7.5 KiB
C

/*-
* Copyright (c) 1998 - 2003 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*
* $FreeBSD$
*/
#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/bus.h>
#include <pci/pcivar.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <dev/ata/ata-all.h>
#include <dev/ata/ata-pci.h>
/* prototypes */
static void ata_dmasetupc_cb(void *, bus_dma_segment_t *, int, int);
static int ata_dmaalloc(struct ata_channel *);
static void ata_dmafree(struct ata_channel *);
static void ata_dmasetupd_cb(void *, bus_dma_segment_t *, int, int);
static int ata_dmasetup(struct ata_device *, caddr_t, int32_t);
/* local vars */
static MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA");
/* misc defines */
#define MAXSEGSZ PAGE_SIZE
#define MAXTABSZ PAGE_SIZE
#define MAXCTLDMASZ (2 * (MAXTABSZ + MAXPHYS))
struct ata_dc_cb_args {
bus_addr_t maddr;
int error;
};
int
ata_dmainit(struct ata_channel *ch)
{
if (!(ch->dma =
malloc(sizeof(struct ata_dma_data), M_ATADMA, M_NOWAIT | M_ZERO)))
return ENOMEM;
ch->dma->alloc = ata_dmaalloc;
ch->dma->free = ata_dmafree;
ch->dma->setup = ata_dmasetup;
ch->dma->start = ata_dmastart;
ch->dma->stop = ata_dmastop;
ch->dma->alignment = 2;
return 0;
}
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 int
ata_dmaalloc(struct ata_channel *ch)
{
struct ata_dc_cb_args ccba;
int error;
if (!ch->dma->dmatag) {
if (bus_dma_tag_create(NULL, 1, 0,
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
NULL, NULL, MAXCTLDMASZ, ATA_DMA_ENTRIES,
BUS_SPACE_MAXSIZE_32BIT, 0, &ch->dma->dmatag)) {
printf("DMA tag allocation failed, disabling DMA\n");
}
}
if (!ch->dma->cdmatag) {
if ((error = bus_dma_tag_create(ch->dma->dmatag, 1, PAGE_SIZE,
BUS_SPACE_MAXADDR_32BIT,
BUS_SPACE_MAXADDR, NULL, NULL,
MAXTABSZ, 1, MAXTABSZ,
BUS_DMA_ALLOCNOW, &ch->dma->cdmatag)))
return error;
}
if (!ch->dma->ddmatag) {
if ((error = bus_dma_tag_create(ch->dma->dmatag, ch->dma->alignment, 0,
BUS_SPACE_MAXADDR_32BIT,
BUS_SPACE_MAXADDR, NULL, NULL,
MAXPHYS, ATA_DMA_ENTRIES, MAXSEGSZ,
BUS_DMA_ALLOCNOW, &ch->dma->ddmatag)))
return error;
}
if (!ch->dma->mdmatab) {
if ((error = bus_dmamem_alloc(ch->dma->cdmatag,
(void **)&ch->dma->dmatab, 0,
&ch->dma->cdmamap)))
return error;
if ((error = bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap,
ch->dma->dmatab, MAXTABSZ,
ata_dmasetupc_cb, &ccba, 0)) != 0 ||
ccba.error != 0) {
bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab,ch->dma->cdmamap);
return error;
}
ch->dma->mdmatab = ccba.maddr;
}
if (!ch->dma->ddmamap) {
if ((error = bus_dmamap_create(ch->dma->ddmatag, 0,
&ch->dma->ddmamap)) != 0)
return error;
}
return 0;
}
static void
ata_dmafree(struct ata_channel *ch)
{
if (ch->dma->mdmatab) {
bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap);
bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap);
ch->dma->mdmatab = 0;
ch->dma->cdmamap = NULL;
ch->dma->dmatab = NULL;
}
if (ch->dma->ddmamap) {
bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap);
ch->dma->ddmamap = NULL;
}
if (ch->dma->cdmatag) {
bus_dma_tag_destroy(ch->dma->cdmatag);
ch->dma->cdmatag = NULL;
}
if (ch->dma->ddmatag) {
bus_dma_tag_destroy(ch->dma->ddmatag);
ch->dma->ddmatag = NULL;
}
if (ch->dma->dmatag) {
bus_dma_tag_destroy(ch->dma->dmatag);
ch->dma->dmatag = NULL;
}
}
struct ata_dmasetup_data_cb_args {
struct ata_dmaentry *dmatab;
int error;
};
static void
ata_dmasetupd_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
{
struct ata_dmasetup_data_cb_args *cba =
(struct ata_dmasetup_data_cb_args *)xsc;
bus_size_t cnt;
u_int32_t lastcount;
int i, j;
cba->error = error;
if (error != 0)
return;
lastcount = j = 0;
for (i = 0; i < nsegs; i++) {
/*
* A maximum segment size was specified for bus_dma_tag_create, but
* some busdma code does not seem to honor this, so fix up if needed.
*/
for (cnt = 0; cnt < segs[i].ds_len; cnt += MAXSEGSZ, j++) {
cba->dmatab[j].base = htole32(segs[i].ds_addr + cnt);
lastcount = ulmin(segs[i].ds_len - cnt, MAXSEGSZ) & 0xffff;
cba->dmatab[j].count = htole32(lastcount);
}
}
cba->dmatab[j - 1].count = htole32(lastcount | ATA_DMA_EOT);
}
static int
ata_dmasetup(struct ata_device *atadev, caddr_t data, int32_t count)
{
struct ata_channel *ch = atadev->channel;
if (((uintptr_t)data & (ch->dma->alignment - 1)) ||
(count & (ch->dma->alignment - 1))) {
ata_prtdev(atadev, "non aligned DMA transfer attempted\n");
return -1;
}
if (!count) {
ata_prtdev(atadev, "zero length DMA transfer attempted\n");
return -1;
}
return 0;
}
int
ata_dmastart(struct ata_channel *ch, caddr_t data, int32_t count, int dir)
{
struct ata_dmasetup_data_cb_args cba;
if (ch->dma->flags & ATA_DMA_ACTIVE)
panic("ata_dmasetup: transfer active on this device!");
cba.dmatab = ch->dma->dmatab;
bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE);
if (bus_dmamap_load(ch->dma->ddmatag, ch->dma->ddmamap, data, count,
ata_dmasetupd_cb, &cba, 0) || cba.error)
return -1;
bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_POSTWRITE);
bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap,
dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
ch->dma->flags = dir ? (ATA_DMA_ACTIVE | ATA_DMA_READ) : ATA_DMA_ACTIVE;
return 0;
}
int
ata_dmastop(struct ata_channel *ch)
{
bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap,
(ch->dma->flags & ATA_DMA_READ) != 0 ?
BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(ch->dma->ddmatag, ch->dma->ddmamap);
ch->dma->flags = 0;
return 0;
}