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authorEric Miao <eric.miao@marvell.com>2009-01-21 11:29:19 +0800
committerEric Miao <eric.miao@marvell.com>2009-01-21 11:29:19 +0800
commit26a552264bc92d2ec4747b1babb7cb1264908018 (patch)
tree8eeec2279f53274757517c504736fed3bbd6c140 /arch
parentb6729deb26a131083add5b7238c7b7478ef6b502 (diff)
downloadop-kernel-dev-26a552264bc92d2ec4747b1babb7cb1264908018.zip
op-kernel-dev-26a552264bc92d2ec4747b1babb7cb1264908018.tar.gz
[ARM] pxa: stop and disable IRQ for each DMA channels at startup
Some broken bootloaders will leave the DMA channel state unclean, which we should really initialize correctly here. Signed-off-by: Eric Miao <eric.miao@marvell.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-pxa/dma.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/arch/arm/mach-pxa/dma.c b/arch/arm/mach-pxa/dma.c
index b1514fb..7de17fc 100644
--- a/arch/arm/mach-pxa/dma.c
+++ b/arch/arm/mach-pxa/dma.c
@@ -121,20 +121,22 @@ int __init pxa_init_dma(int num_ch)
if (dma_channels == NULL)
return -ENOMEM;
- ret = request_irq(IRQ_DMA, dma_irq_handler, IRQF_DISABLED, "DMA", NULL);
- if (ret) {
- printk (KERN_CRIT "Wow! Can't register IRQ for DMA\n");
- kfree(dma_channels);
- return ret;
- }
-
/* dma channel priorities on pxa2xx processors:
* ch 0 - 3, 16 - 19 <--> (0) DMA_PRIO_HIGH
* ch 4 - 7, 20 - 23 <--> (1) DMA_PRIO_MEDIUM
* ch 8 - 15, 24 - 31 <--> (2) DMA_PRIO_LOW
*/
- for (i = 0; i < num_ch; i++)
+ for (i = 0; i < num_ch; i++) {
+ DCSR(i) = 0;
dma_channels[i].prio = min((i & 0xf) >> 2, DMA_PRIO_LOW);
+ }
+
+ ret = request_irq(IRQ_DMA, dma_irq_handler, IRQF_DISABLED, "DMA", NULL);
+ if (ret) {
+ printk (KERN_CRIT "Wow! Can't register IRQ for DMA\n");
+ kfree(dma_channels);
+ return ret;
+ }
num_dma_channels = num_ch;
return 0;
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