/*- * Copyright (c) 1998 - 2006 Søren Schmidt * 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. * * $FreeBSD: src/sys/dev/ata/ata-dma.c,v 1.147 2007/04/08 21:53:52 sos Exp $ * $DragonFly: src/sys/dev/disk/nata/ata-dma.c,v 1.5 2007/07/23 19:26:09 dillon Exp $ */ #include "opt_ata.h" #include #include #include #include #include #include #include #include #include "ata-all.h" #include "ata-pci.h" #include "ata_if.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); ch->dma = kmalloc(sizeof(struct ata_dma), M_ATADMA, M_INTWAIT|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(NULL, ch->dma->alignment, 0, ch->dma->max_address, BUS_SPACE_MAXADDR, NULL, NULL, ch->dma->max_iosize, ATA_DMA_ENTRIES, ch->dma->segsize, 0, &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, &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, &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, &ch->dma->work_tag)) goto error; if (bus_dmamem_alloc(ch->dma->work_tag, (void *)&ch->dma->work, 0, (void *)&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); kfree(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; } if (ch->dma) kfree(ch->dma, M_ATADMA); } 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; static struct krate krate_nata_ovdma = { .freq = 1 }; 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"); panic("zero length DMA transfer"); 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) { krateprintf(&krate_nata_ovdma, "%s: FAILURE - oversized DMA transfer " "attempt %d > %d\n", device_get_nameunit(dev), 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; }