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| author | Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> | 2009-08-23 17:56:12 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2009-08-24 23:05:25 +0100 |
| commit | 9f0f4ae570a148c76be6e86c959c8d4ed912fb1f (patch) | |
| tree | e80599d11a2f45e7c6bf5ab253fad0dd8b726ea9 /arch/arm/plat-omap | |
| parent | e4aa8dd5cadca054a807278b04f67ce8e3b9dc42 (diff) | |
| download | linux-9f0f4ae570a148c76be6e86c959c8d4ed912fb1f.tar.gz linux-9f0f4ae570a148c76be6e86c959c8d4ed912fb1f.tar.bz2 linux-9f0f4ae570a148c76be6e86c959c8d4ed912fb1f.zip | |
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>
Diffstat (limited to 'arch/arm/plat-omap')
| -rw-r--r-- | arch/arm/plat-omap/dma.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c index def14ec265b3..da4cc5288db0 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; |