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authorSamu Onkalo <samu.p.onkalo@nokia.com>2010-08-02 14:21:40 +0300
committerTony Lindgren <tony@atomide.com>2010-08-02 14:21:40 +0300
commit72a1179ed41e0fc6bd5eb58e02e8d230eba10e24 (patch)
treebfb28f4becca1ed753c2c0d10d14c4280b9f66b3 /arch/arm/plat-omap
parent5ebc0d526af51d84b3d6fbf27b69f8d44f277064 (diff)
downloadlinux-72a1179ed41e0fc6bd5eb58e02e8d230eba10e24.tar.bz2
omap: dma: Support for prefetch in destination synchronizedtransfer
Omap DMA controller can prefetch data in advance in case of destination synchronized data transfer. This may increase performance when target HW block doesn't have fifo. Data is waiting for transfer request in DMA fifo instead of read from memory. Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/plat-omap')
-rw-r--r--arch/arm/plat-omap/dma.c11
-rw-r--r--arch/arm/plat-omap/include/plat/dma.h1
2 files changed, 8 insertions, 4 deletions
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index f7f571e7987e..ec7eddf9e525 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -290,7 +290,7 @@ void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
val = dma_read(CCR(lch));
/* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
- val &= ~((3 << 19) | 0x1f);
+ val &= ~((1 << 23) | (3 << 19) | 0x1f);
val |= (dma_trigger & ~0x1f) << 14;
val |= dma_trigger & 0x1f;
@@ -304,11 +304,14 @@ void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
else
val &= ~(1 << 18);
- if (src_or_dst_synch)
+ if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
+ val &= ~(1 << 24); /* dest synch */
+ val |= (1 << 23); /* Prefetch */
+ } else if (src_or_dst_synch) {
val |= 1 << 24; /* source synch */
- else
+ } else {
val &= ~(1 << 24); /* dest synch */
-
+ }
dma_write(val, CCR(lch));
}
diff --git a/arch/arm/plat-omap/include/plat/dma.h b/arch/arm/plat-omap/include/plat/dma.h
index 02232ca2c37f..af3a03941add 100644
--- a/arch/arm/plat-omap/include/plat/dma.h
+++ b/arch/arm/plat-omap/include/plat/dma.h
@@ -345,6 +345,7 @@
#define OMAP_DMA_SYNC_BLOCK 0x02
#define OMAP_DMA_SYNC_PACKET 0x03
+#define OMAP_DMA_DST_SYNC_PREFETCH 0x02
#define OMAP_DMA_SRC_SYNC 0x01
#define OMAP_DMA_DST_SYNC 0x00