add implementation for dma_alloc_coherent(), dma_free_coherent(), dma_map_single() and dma_free_single()
Signed-off-by: Ramon Fried rfried.dev@gmail.com --- arch/mips/include/asm/dma-mapping.h | 46 +++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 arch/mips/include/asm/dma-mapping.h
diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h new file mode 100644 index 0000000000..5c87c28ce8 --- /dev/null +++ b/arch/mips/include/asm/dma-mapping.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * (C) Copyright 2019 + * Ramon Fried rfried.dev@gmail.com + */ + +#ifndef __ASM_MIPS_DMA_MAPPING_H +#define __ASM_MIPS_DMA_MAPPING_H + +#include <linux/dma-direction.h> +#include <asm/addrspace.h> +#define dma_mapping_error(x, y) 0 + +static inline void *dma_alloc_coherent(size_t len, unsigned long *handle) +{ + void *vaddr = memalign(ARCH_DMA_MINALIGN, + ROUND(len, ARCH_DMA_MINALIGN)); + + *handle = CPHYSADDR((unsigned long)vaddr); + return (void *)(CKSEG1ADDR((unsigned long)vaddr)); +} + +static inline void dma_free_coherent(void *addr) +{ + free((void *)CPHYSADDR((unsigned long)addr)); +} + +static inline unsigned long dma_map_single(volatile void *vaddr, size_t len, + enum dma_data_direction dir) +{ + unsigned long dma_addr = CPHYSADDR((unsigned long)vaddr); + + if (dir == DMA_TO_DEVICE) + flush_dcache_range(vaddr, vaddr + len); + if (dir == DMA_FROM_DEVICE) + invalidate_dcache_range(vaddr, vaddr + len); + + return dma_addr; +} + +static inline void dma_unmap_single(volatile void *vaddr, size_t len, + unsigned long paddr) +{ +} + +#endif /* __ASM_MIPS_DMA_MAPPING_H */