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| author | Per Forlin <per.forlin@stericsson.com> | 2010-12-20 18:31:38 +0100 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2011-01-04 17:20:43 -0800 |
| commit | d49278e3351b34870cbffffc5067348a318e7b06 (patch) | |
| tree | a8569e9a24286a0bd885f96e27342e4de2fdecbb /arch | |
| parent | e8a7e48bb248a1196484d3f8afa53bded2b24e71 (diff) | |
| download | linux-d49278e3351b34870cbffffc5067348a318e7b06.tar.gz linux-d49278e3351b34870cbffffc5067348a318e7b06.tar.bz2 linux-d49278e3351b34870cbffffc5067348a318e7b06.zip | |
dmaengine: dma40: Add support to split up large elements
The maximum transfer size of the stedma40 is (64k-1) x data-width.
If the transfer size of one element exceeds this limit
the job is split up and sent as linked transfer.
Signed-off-by: Per Forlin <per.forlin@linaro.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/plat-nomadik/include/plat/ste_dma40.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/plat-nomadik/include/plat/ste_dma40.h b/arch/arm/plat-nomadik/include/plat/ste_dma40.h index 74b62f10d07f..4d6dd4c39b75 100644 --- a/arch/arm/plat-nomadik/include/plat/ste_dma40.h +++ b/arch/arm/plat-nomadik/include/plat/ste_dma40.h @@ -13,6 +13,14 @@ #include <linux/workqueue.h> #include <linux/interrupt.h> +/* + * Maxium size for a single dma descriptor + * Size is limited to 16 bits. + * Size is in the units of addr-widths (1,2,4,8 bytes) + * Larger transfers will be split up to multiple linked desc + */ +#define STEDMA40_MAX_SEG_SIZE 0xFFFF + /* dev types for memcpy */ #define STEDMA40_DEV_DST_MEMORY (-1) #define STEDMA40_DEV_SRC_MEMORY (-1) |