Add support for the Promise command sequencer present on all modern Promise

controllers (PDC203** PDC206**).

This also adds preliminary support for the Promise SX4/SX4000 but *only*
as a "normal" Promise ATA controller (ATA RAID's are supported though
but only RAID0, RAID1 and RAID0+1).

This cuts off yet another 5-8% of the command overhead on promise controllers,
making them the fastest we have ever had support for.

Work is now continuing to add support for this in ATA RAID, to accellerate
ATA RAID quite a bit on these controllers, and especially the SX4/SX4000
series as they have quite a few tricks in there..

This commit also adds a few fixes to the SATA code needed for proper support.

1 files changed, 33 insertions, 2 deletions

diff --git a/sys/dev/ata/ata-dma.c b/sys/dev/ata/ata-dma.c
index 26e9c2d..d140d7d 100644
--- a/sys/dev/ata/ata-dma.c
+++ b/sys/dev/ata/ata-dma.c
@@ -59,6 +59,7 @@ static MALLOC_DEFINE(M_ATADMA, "ATA DMA", "ATA driver DMA");
 /* misc defines */
 #define MAXSEGSZ	PAGE_SIZE
 #define MAXTABSZ	PAGE_SIZE
+#define MAXWSPCSZ	256
 #define MAXCTLDMASZ	(2 * (MAXTABSZ + MAXPHYS))
 
 struct ata_dc_cb_args {
@@ -121,16 +122,35 @@ ata_dmaalloc(struct ata_channel *ch)
 
     if (bus_dmamap_load(ch->dma->cdmatag, ch->dma->cdmamap, ch->dma->dmatab,
 			MAXTABSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) {
-	bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab,ch->dma->cdmamap);
+	bus_dmamem_free(ch->dma->cdmatag, ch->dma->dmatab, ch->dma->cdmamap);
 	goto error;
     }
     ch->dma->mdmatab = ccba.maddr;
+
     if (bus_dmamap_create(ch->dma->ddmatag, 0, &ch->dma->ddmamap))
 	goto error;
+
+    if (bus_dma_tag_create(ch->dma->dmatag, PAGE_SIZE, PAGE_SIZE,
+			   BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
+			   NULL, NULL, MAXWSPCSZ, 1, MAXWSPCSZ,
+			   BUS_DMA_ALLOCNOW, NULL, NULL, &ch->dma->wdmatag))
+	goto error;
+
+    if (bus_dmamem_alloc(ch->dma->wdmatag, (void **)&ch->dma->workspace, 0,
+			 &ch->dma->wdmamap))
+	goto error;
+
+    if (bus_dmamap_load(ch->dma->wdmatag, ch->dma->wdmamap, ch->dma->workspace,
+			MAXWSPCSZ, ata_dmasetupc_cb, &ccba, 0) || ccba.error) {
+	bus_dmamem_free(ch->dma->wdmatag, ch->dma->workspace, ch->dma->wdmamap);
+	goto error;
+    }
+    ch->dma->wdmatab = ccba.maddr;
+
     return;
 
 error:
-    ata_printf(ch, -1, "WARNING - DMA tag allocation failed, disabling DMA\n");
+    ata_printf(ch, -1, "WARNING - DMA allocation failed, disabling DMA\n");
     ata_dmafree(ch);
     free(ch->dma, M_ATADMA);
     ch->dma = NULL;
@@ -139,6 +159,17 @@ error:
 static void
 ata_dmafree(struct ata_channel *ch)
 {
+    if (ch->dma->wdmatab) {
+	bus_dmamap_unload(ch->dma->wdmatag, ch->dma->wdmamap);
+	bus_dmamem_free(ch->dma->wdmatag, ch->dma->workspace, ch->dma->wdmamap);
+	ch->dma->wdmatab = 0;
+	ch->dma->wdmamap = NULL;
+	ch->dma->workspace = NULL;
+    }
+    if (ch->dma->wdmatag) {
+	bus_dma_tag_destroy(ch->dma->wdmatag);
+	ch->dma->wdmatag = NULL;
+    }
     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);