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Diffstat (limited to 'arch/arm/include/asm/dma-direct.h')
| -rw-r--r-- | arch/arm/include/asm/dma-direct.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/arm/include/asm/dma-direct.h b/arch/arm/include/asm/dma-direct.h new file mode 100644 index 000000000..77fcb7ee5 --- /dev/null +++ b/arch/arm/include/asm/dma-direct.h @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef ASM_ARM_DMA_DIRECT_H +#define ASM_ARM_DMA_DIRECT_H 1 + +#include <asm/memory.h> + +/* + * dma_to_pfn/pfn_to_dma/virt_to_dma are architecture private + * functions used internally by the DMA-mapping API to provide DMA + * addresses. They must not be used by drivers. + */ +static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) +{ + if (dev && dev->dma_range_map) + pfn = PFN_DOWN(translate_phys_to_dma(dev, PFN_PHYS(pfn))); + return (dma_addr_t)__pfn_to_bus(pfn); +} + +static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) +{ + unsigned long pfn = __bus_to_pfn(addr); + + if (dev && dev->dma_range_map) + pfn = PFN_DOWN(translate_dma_to_phys(dev, PFN_PHYS(pfn))); + return pfn; +} + +static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) +{ + if (dev) + return pfn_to_dma(dev, virt_to_pfn(addr)); + + return (dma_addr_t)__virt_to_bus((unsigned long)(addr)); +} + +static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) +{ + unsigned int offset = paddr & ~PAGE_MASK; + return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset; +} + +static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) +{ + unsigned int offset = dev_addr & ~PAGE_MASK; + return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset; +} + +#endif /* ASM_ARM_DMA_DIRECT_H */ |