forked from luck/tmp_suning_uos_patched
dma-direct: remove the cached_kernel_address hook
dma-direct now finds the kernel address for coherent allocations based on the dma address, so the cached_kernel_address hooks is unused and can be removed entirely. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Robin Murphy <robin.murphy@arm.com>
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@ -249,7 +249,7 @@ config ARCH_HAS_SET_DIRECT_MAP
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#
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# Select if arch has an uncached kernel segment and provides the
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# uncached_kernel_address / cached_kernel_address symbols to use it
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# uncached_kernel_address symbol to use it
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#
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config ARCH_HAS_UNCACHED_SEGMENT
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select ARCH_HAS_DMA_PREP_COHERENT
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@ -49,11 +49,4 @@ void *uncached_kernel_address(void *ptr)
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pr_warn("ERROR: Your cache coherent area is CACHED!!!\n");
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return (void *)addr;
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}
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void *cached_kernel_address(void *ptr)
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{
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unsigned long addr = (unsigned long)ptr;
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return (void *)(addr & ~UNCACHED_SHADOW_MASK);
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}
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#endif /* CONFIG_MMU */
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@ -54,11 +54,6 @@ void *uncached_kernel_address(void *addr)
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return (void *)(__pa(addr) + UNCAC_BASE);
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}
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void *cached_kernel_address(void *addr)
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{
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return __va(addr) - UNCAC_BASE;
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}
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static inline void dma_sync_virt(void *addr, size_t size,
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enum dma_data_direction dir)
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{
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@ -75,13 +75,3 @@ void *uncached_kernel_address(void *ptr)
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return (void *)ptr;
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}
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void *cached_kernel_address(void *ptr)
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{
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unsigned long addr = (unsigned long)ptr;
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addr &= ~CONFIG_NIOS2_IO_REGION_BASE;
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addr |= CONFIG_NIOS2_KERNEL_REGION_BASE;
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return (void *)ptr;
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}
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@ -88,18 +88,12 @@ void arch_dma_prep_coherent(struct page *page, size_t size)
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/*
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* Memory caching is platform-dependent in noMMU xtensa configurations.
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* The following two functions should be implemented in platform code
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* in order to enable coherent DMA memory operations when CONFIG_MMU is not
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* enabled.
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* This function should be implemented in platform code in order to enable
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* coherent DMA memory operations when CONFIG_MMU is not enabled.
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*/
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#ifdef CONFIG_MMU
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void *uncached_kernel_address(void *p)
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{
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return p + XCHAL_KSEG_BYPASS_VADDR - XCHAL_KSEG_CACHED_VADDR;
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}
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void *cached_kernel_address(void *p)
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{
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return p + XCHAL_KSEG_CACHED_VADDR - XCHAL_KSEG_BYPASS_VADDR;
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}
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#endif /* CONFIG_MMU */
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@ -109,6 +109,5 @@ static inline void arch_dma_prep_coherent(struct page *page, size_t size)
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#endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
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void *uncached_kernel_address(void *addr);
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void *cached_kernel_address(void *addr);
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#endif /* _LINUX_DMA_NONCOHERENT_H */
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