diff options
| author | Alexander Graf <agraf@suse.de> | 2016-06-03 08:18:22 +0200 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2016-06-06 13:48:54 -0700 |
| commit | 1a9a0536d8ad0ad804758f1f2ce1f2dc0c5e053a (patch) | |
| tree | 84c660bd5b898ab4fa0d832aeb19955683d628dd /arch/arm64/include | |
| parent | 1a695a905c18548062509178b98bc91e67510864 (diff) | |
| download | linux-1a9a0536d8ad0ad804758f1f2ce1f2dc0c5e053a.tar.bz2 | |
arm64: Allow for different DMA and CPU bus offsets
On arm64, all SoCs we supported so far either have an IOMMU or have bus
addresses equal to CPU addresses.
However, with the Raspberry Pi 3 coming up, this is no longer true. To
allow DMA to work with an AArch64 kernel on those devices, let's allow
devices to have DMA offsets again.
Signed-off-by: Alexander Graf <agraf@suse.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/dma-mapping.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h index 7dbea6c070ec..ccea82c2b089 100644 --- a/arch/arm64/include/asm/dma-mapping.h +++ b/arch/arm64/include/asm/dma-mapping.h @@ -66,12 +66,16 @@ static inline bool is_device_dma_coherent(struct device *dev) static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) { - return (dma_addr_t)paddr; + dma_addr_t dev_addr = (dma_addr_t)paddr; + + return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); } static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) { - return (phys_addr_t)dev_addr; + phys_addr_t paddr = (phys_addr_t)dev_addr; + + return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); } static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) @@ -86,5 +90,14 @@ static inline void dma_mark_clean(void *addr, size_t size) { } +/* Override for dma_max_pfn() */ +static inline unsigned long dma_max_pfn(struct device *dev) +{ + dma_addr_t dma_max = (dma_addr_t)*dev->dma_mask; + + return (ulong)dma_to_phys(dev, dma_max) >> PAGE_SHIFT; +} +#define dma_max_pfn(dev) dma_max_pfn(dev) + #endif /* __KERNEL__ */ #endif /* __ASM_DMA_MAPPING_H */ |