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dma: sh: provide a migration path for slave drivers to stop using .private

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This patch extends the sh dmaengine driver to support the preferred channel
selection and configuration method, instead of using the "private" field
from struct dma_chan. We add a standard filter function to be used by
slave drivers instead of implementing their own ones, and add support for
the DMA_SLAVE_CONFIG control operation, which must accompany the new
channel selection method. We still support the legacy .private channel
allocation method to cater for a smooth driver migration.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
[applied a trvial checkpath fix]
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
This commit is contained in:
Guennadi Liakhovetski 2012-07-05 12:29:42 +02:00 • committed by Vinod Koul
parent c2cdb7e4d1
commit 1ff8df4f53
4 changed files with 95 additions and 28 deletions
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2
include/linux/sh_dma.h
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@ -99,4 +99,6 @@ struct sh_dmae_pdata {
#define CHCR_TE 0x00000002
#define CHCR_IE 0x00000004
bool shdma_chan_filter(struct dma_chan *chan, void *arg);
#endif