diff options
| author | Vignesh Raghavendra <vigneshr@ti.com> | 2020-01-16 14:23:45 +0530 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2020-01-25 12:04:36 -0500 |
| commit | c0a5a81f746f18a5d8ed4bf2c062d03e3519ab5e (patch) | |
| tree | 875e5db2bd4d4bfc774b7cc9d4977dbe74a9d308 /arch/x86/include/asm | |
| parent | 1fdbad021fe5f3bc8f8bb5b43e55ecc56432a6b4 (diff) | |
asm: dma-mapping.h: Fix dma mapping functions
Subsystems such as USB expect dma_map_single() and dma_unmap_single() to
do dcache flush/invalidate operations as required. For example, see
see drivers/usb/gadget/udc/udc-core.c::usb_gadget_map_request().
Currently drivers do this locally, (see drivers/usb/dwc3/ep0.c,
drivers/mtd/nand/raw/denali.c etc..)
Update arch specific dma_map_single() and dma_unmap_single() APIs to do
cache flush/invalidate operations, so that drivers need not implement
them locally.
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/dma-mapping.h | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h index b353ff0bef..900b99b8a6 100644 --- a/arch/x86/include/asm/dma-mapping.h +++ b/arch/x86/include/asm/dma-mapping.h @@ -7,7 +7,11 @@ #ifndef __ASM_X86_DMA_MAPPING_H #define __ASM_X86_DMA_MAPPING_H +#include <common.h> +#include <asm/cache.h> +#include <cpu_func.h> #include <linux/dma-direction.h> +#include <malloc.h> #define dma_mapping_error(x, y) 0 @@ -25,12 +29,27 @@ static inline void dma_free_coherent(void *addr) static inline unsigned long dma_map_single(volatile void *vaddr, size_t len, enum dma_data_direction dir) { - return (unsigned long)vaddr; + unsigned long addr = (unsigned long)vaddr; + + len = ALIGN(len, ARCH_DMA_MINALIGN); + + if (dir == DMA_FROM_DEVICE) + invalidate_dcache_range(addr, addr + len); + else + flush_dcache_range(addr, addr + len); + + return addr; } static inline void dma_unmap_single(volatile void *vaddr, size_t len, - unsigned long paddr) + enum dma_data_direction dir) { + unsigned long addr = (unsigned long)vaddr; + + len = ALIGN(len, ARCH_DMA_MINALIGN); + + if (dir != DMA_TO_DEVICE) + invalidate_dcache_range(addr, addr + len); } #endif /* __ASM_X86_DMA_MAPPING_H */ |