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-rw-r--r--sys/dev/ata/ata-dma.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/sys/dev/ata/ata-dma.c b/sys/dev/ata/ata-dma.c
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--- /dev/null
+++ b/sys/dev/ata/ata-dma.c
@@ -0,0 +1,252 @@
+/*-
+ * 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;
+}
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