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authorNicolas Ferre <nicolas.ferre@atmel.com>2011-04-30 18:57:49 +0400
committerVinod Koul <vinod.koul@intel.com>2011-05-02 14:12:09 +0400
commitae14d4b5e0a4ebc4e674831cbb97b73ba66dba08 (patch)
tree295f1ae8cab6e5b87d9cb88ef51c8f970eec8d9a /drivers/dma/at_hdmac_regs.h
parent2f432823ec6e693d7b934e805ce1838f41d66ce7 (diff)
downloadlinux-ae14d4b5e0a4ebc4e674831cbb97b73ba66dba08.tar.xz
dmaengine: at_hdmac: specialize AHB interfaces to optimize transfers
DMA controller has two AHB interfaces on the SOC internal matrix. It is more efficient to specialize each interface as the access to memory can introduce latencies that are not compatible with peripheral accesses requirements. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/at_hdmac_regs.h')
-rw-r--r--drivers/dma/at_hdmac_regs.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h
index c79a9e07f7be..ae3056df4f4b 100644
--- a/drivers/dma/at_hdmac_regs.h
+++ b/drivers/dma/at_hdmac_regs.h
@@ -103,6 +103,10 @@
/* Bitfields in CTRLB */
#define ATC_SIF(i) (0x3 & (i)) /* Src tx done via AHB-Lite Interface i */
#define ATC_DIF(i) ((0x3 & (i)) << 4) /* Dst tx done via AHB-Lite Interface i */
+ /* Specify AHB interfaces */
+#define AT_DMA_MEM_IF 0 /* interface 0 as memory interface */
+#define AT_DMA_PER_IF 1 /* interface 1 as peripheral interface */
+
#define ATC_SRC_PIP (0x1 << 8) /* Source Picture-in-Picture enabled */
#define ATC_DST_PIP (0x1 << 12) /* Destination Picture-in-Picture enabled */
#define ATC_SRC_DSCR_DIS (0x1 << 16) /* Src Descriptor fetch disable */