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author | Sascha Hauer <s.hauer@pengutronix.de> | 2018-03-08 21:06:52 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2018-03-29 08:16:40 +0200 |
commit | 653218a2f64d39fdc9bc93c75aad18cd284aea72 (patch) | |
tree | caaf0d1942adbacfcdbe871ae6ccec780484d5f0 | |
parent | b2fd9c9aef0840eda11ba72b3038bf3a85c74a6b (diff) | |
download | barebox-653218a2f64d39fdc9bc93c75aad18cd284aea72.tar.gz barebox-653218a2f64d39fdc9bc93c75aad18cd284aea72.tar.xz |
ARM: aarch64: implement dma operations
For proper DMA support dma_alloc_coherent and DMA sync operations are
needed. Implement them.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r-- | arch/arm/cpu/mmu_64.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/arm/cpu/mmu_64.c b/arch/arm/cpu/mmu_64.c index 6606405b21..20f6c387f3 100644 --- a/arch/arm/cpu/mmu_64.c +++ b/arch/arm/cpu/mmu_64.c @@ -365,3 +365,58 @@ void *phys_to_virt(unsigned long phys) { return (void *)phys; } + +void *dma_alloc_coherent(size_t size, dma_addr_t *dma_handle) +{ + void *ret; + + size = PAGE_ALIGN(size); + ret = xmemalign(PAGE_SIZE, size); + if (dma_handle) + *dma_handle = (dma_addr_t)ret; + + map_region((unsigned long)ret, (unsigned long)ret, size, UNCACHED_MEM); + tlb_invalidate(); + + return ret; +} + +void dma_free_coherent(void *mem, dma_addr_t dma_handle, size_t size) +{ + size = PAGE_ALIGN(size); + + map_region((unsigned long)mem, (unsigned long)mem, size, CACHED_MEM); + + free(mem); +} + +void dma_sync_single_for_cpu(dma_addr_t address, size_t size, + enum dma_data_direction dir) +{ + if (dir != DMA_TO_DEVICE) + v8_inv_dcache_range(address, address + size - 1); +} + +void dma_sync_single_for_device(dma_addr_t address, size_t size, + enum dma_data_direction dir) +{ + if (dir == DMA_FROM_DEVICE) + v8_inv_dcache_range(address, address + size - 1); + v8_flush_dcache_range(address, address + size - 1); +} + +dma_addr_t dma_map_single(struct device_d *dev, void *ptr, size_t size, + enum dma_data_direction dir) +{ + unsigned long addr = (unsigned long)ptr; + + dma_sync_single_for_device(addr, size, dir); + + return addr; +} + +void dma_unmap_single(struct device_d *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir) +{ + dma_sync_single_for_cpu(addr, size, dir); +} |