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dw_dmac: autoconfigure data_width or get it via platform data

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Not all of the controllers support the 64 bit data width. Make it configurable
via platform data. The driver will try to get a value from the component
parameters, otherwise it will use the platform data.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
This commit is contained in:
Andy Shevchenko
2012-09-21 15:05:48 +03:00
committed by Vinod Koul
parent 4a63a8b3e8
commit a09820043c
5 changed files with 56 additions and 6 deletions
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5
include/linux/dw_dmac.h
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@@ -20,6 +20,9 @@
* @is_private: The device channels should be marked as private and not for
* by the general purpose DMA channel allocator.
* @block_size: Maximum block size supported by the controller
* @nr_masters: Number of AHB masters supported by the controller
* @data_width: Maximum data width supported by hardware per AHB master
* (0 - 8bits, 1 - 16bits, ..., 5 - 256bits)
*/
struct dw_dma_platform_data {
unsigned int nr_channels;
@@ -31,6 +34,8 @@ struct dw_dma_platform_data {
#define CHAN_PRIORITY_DESCENDING 1 /* chan7 highest */
unsigned char chan_priority;
unsigned short block_size;
unsigned char nr_masters;
unsigned char data_width[4];
};
/* bursts size */