349 lines
10 KiB
C
349 lines
10 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 1998 - 2008 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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#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/ata/ata-all.h>
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/* prototypes */
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static void ata_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
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static void ata_dmaalloc(device_t dev);
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static void ata_dmafree(device_t dev);
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static void ata_dmasetprd(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
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static int ata_dmaload(struct ata_request *request, void *addr, int *nsegs);
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static int ata_dmaunload(struct ata_request *request);
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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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struct ata_dc_cb_args dcba;
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if (ch->dma.alloc == NULL)
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ch->dma.alloc = ata_dmaalloc;
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if (ch->dma.free == NULL)
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ch->dma.free = ata_dmafree;
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if (ch->dma.setprd == NULL)
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ch->dma.setprd = ata_dmasetprd;
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if (ch->dma.load == NULL)
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ch->dma.load = ata_dmaload;
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if (ch->dma.unload == NULL)
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ch->dma.unload = ata_dmaunload;
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if (ch->dma.alignment == 0)
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ch->dma.alignment = 2;
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if (ch->dma.boundary == 0)
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ch->dma.boundary = 65536;
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if (ch->dma.segsize == 0)
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ch->dma.segsize = 65536;
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if (ch->dma.max_iosize == 0)
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ch->dma.max_iosize = (ATA_DMA_ENTRIES - 1) * PAGE_SIZE;
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if (ch->dma.max_address == 0)
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ch->dma.max_address = BUS_SPACE_MAXADDR_32BIT;
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if (ch->dma.dma_slots == 0)
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ch->dma.dma_slots = 1;
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if (bus_dma_tag_create(bus_get_dma_tag(dev), ch->dma.alignment, 0,
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ch->dma.max_address, 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, 64 * 1024,
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ch->dma.max_address, 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,
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BUS_DMA_WAITOK | BUS_DMA_COHERENT,
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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, &dcba, 0) ||
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dcba.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 = dcba.maddr;
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return;
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error:
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device_printf(dev, "WARNING - DMA initialization failed, disabling DMA\n");
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ata_dmafini(dev);
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}
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void
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ata_dmafini(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 = 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.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_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 *dcba = (struct ata_dc_cb_args *)xsc;
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if (!(dcba->error = error))
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dcba->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 dcba;
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int i;
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/* alloc and setup needed dma slots */
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bzero(ch->dma.slot, sizeof(struct ata_dmaslot) * ATA_DMA_SLOTS);
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for (i = 0; i < ch->dma.dma_slots; i++) {
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struct ata_dmaslot *slot = &ch->dma.slot[i];
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if (bus_dma_tag_create(ch->dma.dmatag, PAGE_SIZE, PAGE_SIZE,
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ch->dma.max_address, BUS_SPACE_MAXADDR,
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NULL, NULL, PAGE_SIZE, 1, PAGE_SIZE,
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0, NULL, NULL, &slot->sg_tag)) {
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device_printf(ch->dev, "FAILURE - create sg_tag\n");
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goto error;
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}
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if (bus_dmamem_alloc(slot->sg_tag, (void **)&slot->sg, BUS_DMA_WAITOK,
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&slot->sg_map)) {
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device_printf(ch->dev, "FAILURE - alloc sg_map\n");
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goto error;
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}
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if (bus_dmamap_load(slot->sg_tag, slot->sg_map, slot->sg, MAXTABSZ,
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ata_dmasetupc_cb, &dcba, 0) || dcba.error) {
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device_printf(ch->dev, "FAILURE - load sg\n");
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goto error;
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}
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slot->sg_bus = dcba.maddr;
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if (bus_dma_tag_create(ch->dma.dmatag,
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ch->dma.alignment, ch->dma.boundary,
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ch->dma.max_address, 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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BUS_DMA_ALLOCNOW, NULL, NULL, &slot->data_tag)) {
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device_printf(ch->dev, "FAILURE - create data_tag\n");
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goto error;
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}
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if (bus_dmamap_create(slot->data_tag, 0, &slot->data_map)) {
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device_printf(ch->dev, "FAILURE - create data_map\n");
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goto error;
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}
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}
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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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}
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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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int i;
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/* free all dma slots */
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for (i = 0; i < ATA_DMA_SLOTS; i++) {
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struct ata_dmaslot *slot = &ch->dma.slot[i];
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if (slot->sg_bus) {
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bus_dmamap_unload(slot->sg_tag, slot->sg_map);
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slot->sg_bus = 0;
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}
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if (slot->sg) {
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bus_dmamem_free(slot->sg_tag, slot->sg, slot->sg_map);
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slot->sg = NULL;
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}
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if (slot->data_map) {
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bus_dmamap_destroy(slot->data_tag, slot->data_map);
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slot->data_map = NULL;
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}
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if (slot->sg_tag) {
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bus_dma_tag_destroy(slot->sg_tag);
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slot->sg_tag = NULL;
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}
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if (slot->data_tag) {
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bus_dma_tag_destroy(slot->data_tag);
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slot->data_tag = NULL;
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}
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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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KASSERT(nsegs <= ATA_DMA_ENTRIES, ("too many DMA segment entries\n"));
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args->nsegs = nsegs;
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}
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static int
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ata_dmaload(struct ata_request *request, void *addr, int *entries)
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{
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struct ata_channel *ch = device_get_softc(request->parent);
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struct ata_dmasetprd_args dspa;
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int error;
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ATA_DEBUG_RQ(request, "dmaload");
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if (request->dma) {
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device_printf(request->parent,
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"FAILURE - already active DMA on this device\n");
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return EIO;
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}
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if (!request->bytecount) {
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device_printf(request->parent,
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"FAILURE - zero length DMA transfer attempted\n");
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return EIO;
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}
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if (request->bytecount & (ch->dma.alignment - 1)) {
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device_printf(request->parent,
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"FAILURE - odd-sized DMA transfer attempt %d %% %d\n",
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request->bytecount, ch->dma.alignment);
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return EIO;
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}
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if (request->bytecount > ch->dma.max_iosize) {
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device_printf(request->parent,
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"FAILURE - oversized DMA transfer attempt %d > %d\n",
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request->bytecount, ch->dma.max_iosize);
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return EIO;
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}
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/* set our slot. XXX SOS NCQ will change that */
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request->dma = &ch->dma.slot[0];
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if (addr)
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dspa.dmatab = addr;
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else
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dspa.dmatab = request->dma->sg;
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if (request->flags & ATA_R_DATA_IN_CCB)
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error = bus_dmamap_load_ccb(request->dma->data_tag,
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request->dma->data_map, request->ccb,
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ch->dma.setprd, &dspa, BUS_DMA_NOWAIT);
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else
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error = bus_dmamap_load(request->dma->data_tag, request->dma->data_map,
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request->data, request->bytecount,
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ch->dma.setprd, &dspa, BUS_DMA_NOWAIT);
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if (error || (error = dspa.error)) {
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device_printf(request->parent, "FAILURE - load data\n");
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goto error;
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}
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if (entries)
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*entries = dspa.nsegs;
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bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map,
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BUS_DMASYNC_PREWRITE);
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bus_dmamap_sync(request->dma->data_tag, request->dma->data_map,
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(request->flags & ATA_R_READ) ?
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BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
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return 0;
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error:
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ata_dmaunload(request);
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return EIO;
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}
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int
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ata_dmaunload(struct ata_request *request)
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{
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ATA_DEBUG_RQ(request, "dmaunload");
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if (request->dma) {
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bus_dmamap_sync(request->dma->sg_tag, request->dma->sg_map,
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BUS_DMASYNC_POSTWRITE);
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bus_dmamap_sync(request->dma->data_tag, request->dma->data_map,
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(request->flags & ATA_R_READ) ?
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BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
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bus_dmamap_unload(request->dma->data_tag, request->dma->data_map);
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request->dma = NULL;
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}
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return 0;
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}
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