openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Janusz Krzysztofik 2009-08-23 17:56:12 +02:00 committed by Mark Brown
parent e4aa8dd5ca
commit 9f0f4ae570
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/arm/plat-omap/dma.c
View File

@ -1125,6 +1125,11 @@ int omap_dma_running(void)
void omap_dma_link_lch(int lch_head, int lch_queue) void omap_dma_link_lch(int lch_head, int lch_queue)
{ {
if (omap_dma_in_1510_mode()) { 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"); printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
BUG(); BUG();
return; return;
@ -1147,6 +1152,11 @@ EXPORT_SYMBOL(omap_dma_link_lch);
void omap_dma_unlink_lch(int lch_head, int lch_queue) void omap_dma_unlink_lch(int lch_head, int lch_queue)
{ {
if (omap_dma_in_1510_mode()) { 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"); printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
BUG(); BUG();
return; return;