ARM: S3C: Add info for supporting circular DMA buffers
The S3C64XX DMA implementation will work a lot better with the ability to enqueue circular buffers as the hardware can do it's own linked-list management. Add a function s3c_dma_has_circular() to show that the system can do this and a flag for the channel. Update the s3c24xx/s3c64xx I2S DMA code to deal with this. Signed-off-by: NBen Dooks <ben@simtec.co.uk> Signed-off-by: NBen Dooks <ben-linux@fluff.org> Acked-by: Mark Brown <broonie@@opensource.wolfsonmicro.com>
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