252 lines
7.5 KiB
C
252 lines
7.5 KiB
C
/*-
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* Copyright (c) 1998 - 2003 Søren Schmidt <sos@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/ata.h>
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#include <sys/kernel.h>
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#include <sys/endian.h>
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#include <sys/malloc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/taskqueue.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <dev/pci/pcivar.h>
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#include <dev/ata/ata-all.h>
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#include <dev/ata/ata-pci.h>
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/* prototypes */
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static void ata_dmaalloc(struct ata_channel *);
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static void ata_dmafree(struct ata_channel *);
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static void ata_dmasetupd_cb(void *, bus_dma_segment_t *, int, int);
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static int ata_dmasetup(struct ata_device *, caddr_t, int32_t);
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/* local vars */
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static MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA");
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/* misc defines */
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#define MAXSEGSZ PAGE_SIZE
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#define MAXTABSZ PAGE_SIZE
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#define MAXCTLDMASZ (2 * (MAXTABSZ + MAXPHYS))
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struct ata_dc_cb_args {
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bus_addr_t maddr;
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int error;
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};
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void
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ata_dmainit(struct ata_channel *ch)
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{
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if ((ch->dma = malloc(sizeof(struct ata_dma), M_ATADMA, M_NOWAIT|M_ZERO))) {
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ch->dma->alloc = ata_dmaalloc;
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ch->dma->free = ata_dmafree;
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ch->dma->setup = ata_dmasetup;
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ch->dma->start = ata_dmastart;
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ch->dma->stop = ata_dmastop;
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ch->dma->alignment = 2;
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ch->dma->max_iosize = 64*1024;
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}
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}
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static void
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ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
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{
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struct ata_dc_cb_args *cba = (struct ata_dc_cb_args *)xsc;
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if (!(cba->error = error))
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cba->maddr = segs[0].ds_addr;
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}
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static void
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ata_dmaalloc(struct ata_channel *ch)
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{
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struct ata_dc_cb_args ccba;
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if (bus_dma_tag_create(NULL, 1, 0, BUS_SPACE_MAXADDR_32BIT,
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BUS_SPACE_MAXADDR, NULL, NULL, MAXCTLDMASZ,
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ATA_DMA_ENTRIES, BUS_SPACE_MAXSIZE_32BIT, 0,
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NULL, NULL, &ch->dma->dmatag))
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goto error;
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if (bus_dma_tag_create(ch->dma->dmatag, 1, PAGE_SIZE,
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BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
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NULL, NULL, MAXTABSZ, 1, MAXTABSZ, BUS_DMA_ALLOCNOW,
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NULL, NULL, &ch->dma->cdmatag))
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goto error;
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if (bus_dma_tag_create(ch->dma->dmatag, ch->dma->alignment, 0,
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BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
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NULL, NULL, MAXPHYS, ATA_DMA_ENTRIES, MAXSEGSZ,
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BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->ddmatag))
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goto error;
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if (bus_dmamem_alloc(ch->dma->cdmatag, (void **)&ch->dma->dmatab, 0,
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&ch->dma->cdmamap))
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goto error;
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if (bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, ch->dma->dmatab,
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MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) {
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bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab,ch->dma->cdmamap);
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goto error;
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}
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ch->dma->mdmatab = ccba.maddr;
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if (bus_dmamap_create(ch->dma->ddmatag, 0, &ch->dma->ddmamap))
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goto error;
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return;
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error:
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ata_printf(ch, -1, "WARNING - DMA tag allocation failed, disabling DMA\n");
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ata_dmafree(ch);
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free(ch->dma, M_ATADMA);
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ch->dma = NULL;
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}
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static void
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ata_dmafree(struct ata_channel *ch)
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{
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if (ch->dma->mdmatab) {
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bus_dmamap_unload(ch->dma->cdmatag, ch->dma->cdmamap);
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bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap);
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ch->dma->mdmatab = 0;
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ch->dma->cdmamap = NULL;
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ch->dma->dmatab = NULL;
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}
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if (ch->dma->ddmamap) {
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bus_dmamap_destroy(ch->dma->ddmatag, ch->dma->ddmamap);
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ch->dma->ddmamap = NULL;
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}
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if (ch->dma->cdmatag) {
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bus_dma_tag_destroy(ch->dma->cdmatag);
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ch->dma->cdmatag = NULL;
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}
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if (ch->dma->ddmatag) {
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bus_dma_tag_destroy(ch->dma->ddmatag);
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ch->dma->ddmatag = NULL;
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}
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if (ch->dma->dmatag) {
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bus_dma_tag_destroy(ch->dma->dmatag);
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ch->dma->dmatag = NULL;
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}
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}
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struct ata_dmasetup_data_cb_args {
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struct ata_dmaentry *dmatab;
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int error;
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};
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static void
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ata_dmasetupd_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
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{
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struct ata_dmasetup_data_cb_args *cba =
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(struct ata_dmasetup_data_cb_args *)xsc;
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bus_size_t cnt;
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u_int32_t lastcount;
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int i, j;
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cba->error = error;
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if (error != 0)
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return;
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lastcount = j = 0;
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for (i = 0; i < nsegs; i++) {
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/*
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* A maximum segment size was specified for bus_dma_tag_create, but
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* some busdma code does not seem to honor this, so fix up if needed.
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*/
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for (cnt = 0; cnt < segs[i].ds_len; cnt += MAXSEGSZ, j++) {
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cba->dmatab[j].base = htole32(segs[i].ds_addr + cnt);
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lastcount = ulmin(segs[i].ds_len - cnt, MAXSEGSZ) & 0xffff;
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cba->dmatab[j].count = htole32(lastcount);
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}
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}
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cba->dmatab[j - 1].count = htole32(lastcount | ATA_DMA_EOT);
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}
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static int
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ata_dmasetup(struct ata_device *atadev, caddr_t data, int32_t count)
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{
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struct ata_channel *ch = atadev->channel;
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if (((uintptr_t)data & (ch->dma->alignment - 1)) ||
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(count & (ch->dma->alignment - 1))) {
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ata_prtdev(atadev, "FAILURE - non aligned DMA transfer attempted\n");
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return -1;
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}
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if (!count) {
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ata_prtdev(atadev, "FAILURE - zero length DMA transfer attempted\n");
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return -1;
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}
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if (count > ch->dma->max_iosize) {
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ata_prtdev(atadev,
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"FAILURE - oversized DMA transfer attempted %d > %d\n",
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count, ch->dma->max_iosize);
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return -1;
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}
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return 0;
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}
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int
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ata_dmastart(struct ata_channel *ch, caddr_t data, int32_t count, int dir)
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{
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struct ata_dmasetup_data_cb_args cba;
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if (ch->dma->flags & ATA_DMA_ACTIVE)
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panic("ata_dmasetup: transfer active on this device!");
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cba.dmatab = ch->dma->dmatab;
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bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_PREWRITE);
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if (bus_dmamap_load(ch->dma->ddmatag, ch->dma->ddmamap, data, count,
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ata_dmasetupd_cb, &cba, 0) || cba.error)
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return -1;
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bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap,
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dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
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ch->dma->flags = dir ? (ATA_DMA_ACTIVE | ATA_DMA_READ) : ATA_DMA_ACTIVE;
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return 0;
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}
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int
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ata_dmastop(struct ata_channel *ch)
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{
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bus_dmamap_sync(ch->dma->cdmatag, ch->dma->cdmamap, BUS_DMASYNC_POSTWRITE);
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bus_dmamap_sync(ch->dma->ddmatag, ch->dma->ddmamap,
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(ch->dma->flags & ATA_DMA_READ) != 0 ?
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BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
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bus_dmamap_unload(ch->dma->ddmatag, ch->dma->ddmamap);
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ch->dma->flags = 0;
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return 0;
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}
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