283 lines
8.2 KiB
C
283 lines
8.2 KiB
C
/*-
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* Copyright (c) 1998 - 2007 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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*
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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/sema.h>
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#include <sys/taskqueue.h>
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#include <vm/uma.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(device_t);
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static void ata_dmafree(device_t);
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static void ata_dmasetprd(void *, bus_dma_segment_t *, int, int);
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static int ata_dmaload(device_t, caddr_t, int32_t, int, void *, int *);
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static int ata_dmaunload(device_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 MAXTABSZ PAGE_SIZE
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#define MAXWSPCSZ PAGE_SIZE*2
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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(device_t dev)
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{
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struct ata_channel *ch = device_get_softc(dev);
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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->setprd = ata_dmasetprd;
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ch->dma->load = ata_dmaload;
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ch->dma->unload = ata_dmaunload;
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ch->dma->alignment = 2;
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ch->dma->boundary = 128 * DEV_BSIZE;
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ch->dma->segsize = 128 * DEV_BSIZE;
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ch->dma->max_iosize = 128 * DEV_BSIZE;
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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(device_t dev)
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{
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struct ata_channel *ch = device_get_softc(dev);
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struct ata_dc_cb_args ccba;
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if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma->alignment, 0,
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BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
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NULL, NULL, ch->dma->max_iosize,
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ATA_DMA_ENTRIES, ch->dma->segsize,
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0, NULL, NULL, &ch->dma->dmatag))
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goto error;
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if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE,
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BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
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NULL, NULL, MAXTABSZ, 1, MAXTABSZ,
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0, NULL, NULL, &ch->dma->sg_tag))
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goto error;
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if (bus_dma_tag_create(ch->dma->dmatag,ch->dma->alignment,ch->dma->boundary,
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BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
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NULL, NULL, ch->dma->max_iosize,
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ATA_DMA_ENTRIES, ch->dma->segsize,
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0, NULL, NULL, &ch->dma->data_tag))
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goto error;
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if (bus_dmamem_alloc(ch->dma->sg_tag, (void **)&ch->dma->sg, 0,
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&ch->dma->sg_map))
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goto error;
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if (bus_dmamap_load(ch->dma->sg_tag, ch->dma->sg_map, ch->dma->sg,
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MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) {
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bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map);
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goto error;
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}
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ch->dma->sg_bus = ccba.maddr;
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if (bus_dmamap_create(ch->dma->data_tag, 0, &ch->dma->data_map))
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goto error;
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if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, 64 * 1024,
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BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
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NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ,
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0, NULL, NULL, &ch->dma->work_tag))
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goto error;
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if (bus_dmamem_alloc(ch->dma->work_tag, (void **)&ch->dma->work, 0,
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&ch->dma->work_map))
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goto error;
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if (bus_dmamap_load(ch->dma->work_tag, ch->dma->work_map,ch->dma->work,
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MAXWSPCSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) {
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bus_dmamem_free(ch->dma->work_tag,ch->dma->work, ch->dma->work_map);
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goto error;
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}
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ch->dma->work_bus = ccba.maddr;
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return;
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error:
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device_printf(dev, "WARNING - DMA allocation failed, disabling DMA\n");
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ata_dmafree(dev);
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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(device_t dev)
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{
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struct ata_channel *ch = device_get_softc(dev);
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if (ch->dma->work_bus) {
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bus_dmamap_unload(ch->dma->work_tag, ch->dma->work_map);
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bus_dmamem_free(ch->dma->work_tag, ch->dma->work, ch->dma->work_map);
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ch->dma->work_bus = 0;
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ch->dma->work_map = NULL;
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ch->dma->work = NULL;
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}
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if (ch->dma->work_tag) {
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bus_dma_tag_destroy(ch->dma->work_tag);
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ch->dma->work_tag = NULL;
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}
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if (ch->dma->sg_bus) {
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bus_dmamap_unload(ch->dma->sg_tag, ch->dma->sg_map);
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bus_dmamem_free(ch->dma->sg_tag, ch->dma->sg, ch->dma->sg_map);
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ch->dma->sg_bus = 0;
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ch->dma->sg_map = NULL;
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ch->dma->sg = NULL;
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}
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if (ch->dma->data_map) {
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bus_dmamap_destroy(ch->dma->data_tag, ch->dma->data_map);
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ch->dma->data_map = NULL;
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}
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if (ch->dma->sg_tag) {
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bus_dma_tag_destroy(ch->dma->sg_tag);
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ch->dma->sg_tag = NULL;
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}
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if (ch->dma->data_tag) {
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bus_dma_tag_destroy(ch->dma->data_tag);
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ch->dma->data_tag = 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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static void
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ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
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{
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struct ata_dmasetprd_args *args = xsc;
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struct ata_dma_prdentry *prd = args->dmatab;
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int i;
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if ((args->error = error))
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return;
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for (i = 0; i < nsegs; i++) {
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prd[i].addr = htole32(segs[i].ds_addr);
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prd[i].count = htole32(segs[i].ds_len);
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}
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prd[i - 1].count |= htole32(ATA_DMA_EOT);
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args->nsegs = nsegs;
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}
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static int
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ata_dmaload(device_t dev, caddr_t data, int32_t count, int dir,
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void *addr, int *entries)
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{
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struct ata_channel *ch = device_get_softc(dev);
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struct ata_dmasetprd_args cba;
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int error;
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if (ch->dma->flags & ATA_DMA_LOADED) {
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device_printf(dev, "FAILURE - already active DMA on this device\n");
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return EIO;
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}
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if (!count) {
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device_printf(dev, "FAILURE - zero length DMA transfer attempted\n");
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return EIO;
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}
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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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device_printf(dev, "FAILURE - non aligned DMA transfer attempted\n");
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return EIO;
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}
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if (count > ch->dma->max_iosize) {
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device_printf(dev, "FAILURE - oversized DMA transfer attempt %d > %d\n",
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count, ch->dma->max_iosize);
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return EIO;
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}
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cba.dmatab = addr;
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if ((error = bus_dmamap_load(ch->dma->data_tag, ch->dma->data_map,
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data, count, ch->dma->setprd, &cba,
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BUS_DMA_NOWAIT)) || (error = cba.error))
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return error;
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*entries = cba.nsegs;
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bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map, BUS_DMASYNC_PREWRITE);
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bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map,
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dir ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
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ch->dma->cur_iosize = count;
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ch->dma->flags = dir ? (ATA_DMA_LOADED | ATA_DMA_READ) : ATA_DMA_LOADED;
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return 0;
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}
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int
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ata_dmaunload(device_t dev)
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{
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struct ata_channel *ch = device_get_softc(dev);
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if (ch->dma->flags & ATA_DMA_LOADED) {
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bus_dmamap_sync(ch->dma->sg_tag, ch->dma->sg_map,
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BUS_DMASYNC_POSTWRITE);
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bus_dmamap_sync(ch->dma->data_tag, ch->dma->data_map,
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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->data_tag, ch->dma->data_map);
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ch->dma->cur_iosize = 0;
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ch->dma->flags &= ~ATA_DMA_LOADED;
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}
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return 0;
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}
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