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Commit 9f0f4ae5 authored by Janusz Krzysztofik's avatar Janusz Krzysztofik Committed by Mark Brown
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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: default avatarJanusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Acked-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent e4aa8dd5

arch/arm/plat-omap/dma.c

+10 −0
Original line number Diff line number Diff line
@@ -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;