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authorJanusz Krzysztofik <jkrzyszt@tis.icnet.pl>2009-08-23 17:56:12 +0200
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-08-24 23:05:25 +0100
commit9f0f4ae570a148c76be6e86c959c8d4ed912fb1f (patch)
treee80599d11a2f45e7c6bf5ab253fad0dd8b726ea9
parente4aa8dd5cadca054a807278b04f67ce8e3b9dc42 (diff)
downloadop-kernel-dev-9f0f4ae570a148c76be6e86c959c8d4ed912fb1f.zip
op-kernel-dev-9f0f4ae570a148c76be6e86c959c8d4ed912fb1f.tar.gz
ARM: OMAP: DMA: Add support for DMA channel self linking on OMAP1510
Implement DMA channel self linking on OMAP1510 using AUTO_INIT and REPEAT flags of the DMA CCR register. Created against linux-2.6.31-rc5. Tested on Amstrad Delta. Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
-rw-r--r--arch/arm/plat-omap/dma.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index def14ec..da4cc52 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -1125,6 +1125,11 @@ int omap_dma_running(void)
void omap_dma_link_lch(int lch_head, int lch_queue)
{
if (omap_dma_in_1510_mode()) {
+ if (lch_head == lch_queue) {
+ dma_write(dma_read(CCR(lch_head)) | (3 << 8),
+ CCR(lch_head));
+ return;
+ }
printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
BUG();
return;
@@ -1147,6 +1152,11 @@ EXPORT_SYMBOL(omap_dma_link_lch);
void omap_dma_unlink_lch(int lch_head, int lch_queue)
{
if (omap_dma_in_1510_mode()) {
+ if (lch_head == lch_queue) {
+ dma_write(dma_read(CCR(lch_head)) & ~(3 << 8),
+ CCR(lch_head));
+ return;
+ }
printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
BUG();
return;
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