leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ARM: OMAP: Proper handling of DMA4_IRQSTATUS_L0

Browse Source 
The register bits are reset by writing one. Remove the unneeded reads and
fix writes to not clear too many bits.

Signed-off-by: Timo Teras <timo.teras@solidboot.com>
Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Timo Teras 2006-12-06 17:13:52 -08:00 committed by Tony Lindgren
parent 6f9c92f1b9
commit 681e9940da
1 changed files with 3 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
arch/arm/plat-omap/dma.c
View File

@ -557,7 +557,7 @@ int omap_request_dma(int dev_id, const char *dev_name,
omap_enable_channel_irq(free_ch);
/* Clear the CSR register and IRQ status register */
OMAP_DMA_CSR_REG(free_ch) = OMAP2_DMA_CSR_CLEAR_MASK;
omap_writel(~0x0, OMAP_DMA4_IRQSTATUS_L0);
omap_writel(1 << free_ch, OMAP_DMA4_IRQSTATUS_L0);
}
*dma_ch_out = free_ch;
@ -597,10 +597,7 @@ void omap_free_dma(int lch)
/* Clear the CSR register and IRQ status register */
OMAP_DMA_CSR_REG(lch) = OMAP2_DMA_CSR_CLEAR_MASK;
val = omap_readl(OMAP_DMA4_IRQSTATUS_L0);
val |= 1 << lch;
omap_writel(val, OMAP_DMA4_IRQSTATUS_L0);
omap_writel(1 << lch, OMAP_DMA4_IRQSTATUS_L0);
/* Disable all DMA interrupts for the channel. */
OMAP_DMA_CICR_REG(lch) = 0;
@ -927,7 +924,6 @@ static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
static int omap2_dma_handle_ch(int ch)
{
u32 status = OMAP_DMA_CSR_REG(ch);
u32 val;
if (!status)
return 0;
@ -948,11 +944,7 @@ static int omap2_dma_handle_ch(int ch)
dma_chan[ch].dev_id);
OMAP_DMA_CSR_REG(ch) = OMAP2_DMA_CSR_CLEAR_MASK;
val = omap_readl(OMAP_DMA4_IRQSTATUS_L0);
/* ch in this function is from 0-31 while in register it is 1-32 */
val = 1 << (ch);
omap_writel(val, OMAP_DMA4_IRQSTATUS_L0);
omap_writel(1 << ch, OMAP_DMA4_IRQSTATUS_L0);
if (likely(dma_chan[ch].callback != NULL))
dma_chan[ch].callback(ch, status, dma_chan[ch].data);