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[ARM] 3753/1: S3C24XX: DMA fixes

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Patch from Ben Dooks

A number of small issues with the S3C24XX DMA have
cropped up, which this patch fixes. These are:

  - check wether we can load another buff in start
  - update state handling in s3c2410_dma_lastxfer
  - only reload in irq if channel is not idle
  - more informative timeout errors (add source)
  - do not call request_irq() with irqs locked
  - added waitforstop function

The patch also adds a S3C2410_DMAOP_STARTED for
the occasions when the driver wants to ensure that
the DMA system load state is resynced after loading.

Signed-off-by: Ben Dooks <[email protected]>
Signed-off-by: Russell King <[email protected]>
This commit is contained in:
Ben Dooks 2006-08-18 15:32:10 +01:00 • committed by Russell King
commit f57e1abd1b
2 changed files with 145 additions and 19 deletions
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1
include/asm-arm/arch-s3c2410/dma.h
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@ -104,6 +104,7 @@ enum s3c2410_chan_op_e {
S3C2410_DMAOP_RESUME,
S3C2410_DMAOP_FLUSH,
S3C2410_DMAOP_TIMEOUT, /* internal signal to handler */
S3C2410_DMAOP_STARTED, /* indicate channel started */
};
typedef enum s3c2410_chan_op_e s3c2410_chan_op_t;