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| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2018-08-30 22:18:22 -0700 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2018-08-31 08:46:05 +0200 |
| commit | dd0b5b9e8968480e230cf825de3e558a2ee624ad (patch) | |
| tree | 66352976458f1f4d7fb8b294490a9674ee41ab5a /include/dma.h | |
| parent | 06e9ae9b109f0748d0cfa4c7fa35dc904a367f56 (diff) | |
| download | barebox-dd0b5b9e8968480e230cf825de3e558a2ee624ad.tar.gz barebox-dd0b5b9e8968480e230cf825de3e558a2ee624ad.tar.xz | |
driver: Adopt DMA mask concept from Linux
In order to be able to detect cases where DMA isn't capable of
reaching every memory address, port the concept of DMA mask,
dma_set_mask() function and add appropriate check to
dma_mapping_error().
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include/dma.h')
| -rw-r--r-- | include/dma.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/include/dma.h b/include/dma.h index 5fdcb1733c..7f95782635 100644 --- a/include/dma.h +++ b/include/dma.h @@ -35,11 +35,21 @@ dma_addr_t dma_map_single(struct device_d *dev, void *ptr, size_t size, void dma_unmap_single(struct device_d *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir); +#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) + +#define DMA_MASK_NONE 0x0ULL + +static inline void dma_set_mask(struct device_d *dev, u64 dma_mask) +{ + dev->dma_mask = dma_mask; +} + #define DMA_ERROR_CODE (~(dma_addr_t)0) static inline int dma_mapping_error(struct device_d *dev, dma_addr_t dma_addr) { - return dma_addr == DMA_ERROR_CODE; + return dma_addr == DMA_ERROR_CODE || + (dev->dma_mask && dma_addr > dev->dma_mask); } /* streaming DMA - implement the below calls to support HAS_DMA */ |