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dmaengine: Add an enum for the dmaengine alignment constraints

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Most drivers need to set constraints on the buffer alignment for async tx
operations. However, even though it is documented, some drivers either use
a defined constant that is not matching what the alignment variable expects
(like DMA_BUSWIDTH_* constants) or fill the alignment in bytes instead of
power of two.

Add a new enum for these alignments that matches what the framework
expects, and convert the drivers to it.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Maxime Ripard 2015-07-20 10:41:32 +02:00 • committed by Vinod Koul
parent 056f6c8702
commit 77a68e56aa
12 changed files with 32 additions and 21 deletions
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25
include/linux/dmaengine.h
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@ -584,6 +584,20 @@ struct dma_tx_state {
u32 residue;
};
/**
* enum dmaengine_alignment - defines alignment of the DMA async tx
* buffers
*/
enum dmaengine_alignment {
DMAENGINE_ALIGN_1_BYTE = 0,
DMAENGINE_ALIGN_2_BYTES = 1,
DMAENGINE_ALIGN_4_BYTES = 2,
DMAENGINE_ALIGN_8_BYTES = 3,
DMAENGINE_ALIGN_16_BYTES = 4,
DMAENGINE_ALIGN_32_BYTES = 5,
DMAENGINE_ALIGN_64_BYTES = 6,
};
/**
* struct dma_device - info on the entity supplying DMA services
* @chancnt: how many DMA channels are supported
@ -645,10 +659,10 @@ struct dma_device {
dma_cap_mask_t cap_mask;
unsigned short max_xor;
unsigned short max_pq;
u8 copy_align;
u8 xor_align;
u8 pq_align;
u8 fill_align;
enum dmaengine_alignment copy_align;
enum dmaengine_alignment xor_align;
enum dmaengine_alignment pq_align;
enum dmaengine_alignment fill_align;
#define DMA_HAS_PQ_CONTINUE (1 << 15)
int dev_id;
@ -833,7 +847,8 @@ static inline dma_cookie_t dmaengine_submit(struct dma_async_tx_descriptor *desc
return desc->tx_submit(desc);
}
static inline bool dmaengine_check_align(u8 align, size_t off1, size_t off2, size_t len)
static inline bool dmaengine_check_align(enum dmaengine_alignment align,
size_t off1, size_t off2, size_t len)
{
size_t mask;