dma: mmp_pdma: add filter function

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PXA peripherals need to obtain specific DMA request ids which will
eventually be stored in the DRCMR register.

Currently, clients are expected to store that number inside the slave
config block as slave_id, which is unfortunately incompatible with the
way DMA resources are handled in DT environments.

This patch adds a filter function which stores the filter parameter
passed in by of-dma.c into the channel's drcmr register.

For backward compatability, cfg->slave_id is still used if set to
a non-zero value.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

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Daniel Mack 2013-08-10 18:52:18 +02:00 • committed by Vinod Koul

parent 1ac0e845c1

commit 13b3006b8e

2 changed files with 35 additions and 1 deletions

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21

drivers/dma/mmp_pdma.c

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15

include/linux/dma/mmp-pdma.h

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