diff options
Diffstat (limited to 'include/linux/dma-mapping.h')
| -rw-r--r-- | include/linux/dma-mapping.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 62dd6676b7cc..1d4cb72f7fd7 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -61,6 +61,10 @@ struct dma_map_ops { int (*mapping_error)(struct device *dev, dma_addr_t dma_addr); int (*dma_supported)(struct device *dev, u64 mask); int (*set_dma_mask)(struct device *dev, u64 mask); + void *(*remap)(struct device *dev, void *cpu_addr, dma_addr_t handle, + size_t size, struct dma_attrs *attrs); + void (*unremap)(struct device *dev, void *remapped_address, + size_t size); #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK u64 (*get_required_mask)(struct device *dev); #endif @@ -89,6 +93,40 @@ static inline int is_device_dma_capable(struct device *dev) #include <asm-generic/dma-mapping-broken.h> #endif +#ifndef CONFIG_NO_DMA +static inline void *dma_remap(struct device *dev, void *cpu_addr, + dma_addr_t dma_handle, size_t size, struct dma_attrs *attrs) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + BUG_ON(!ops); + + if (!ops->remap) { + WARN_ONCE(1, "Remap function not implemented for %pS\n", + ops->remap); + return NULL; + } + + return ops->remap(dev, cpu_addr, dma_handle, size, attrs); +} + + +static inline void dma_unremap(struct device *dev, void *remapped_addr, + size_t size) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + BUG_ON(!ops); + + if (!ops->unremap) { + WARN_ONCE(1, "unremap function not implemented for %pS\n", + ops->unremap); + return; + } + + return ops->unremap(dev, remapped_addr, size); +} +#endif + + static inline u64 dma_get_mask(struct device *dev) { if (dev && dev->dma_mask && *dev->dma_mask) |