From b1acd4b8a8942f614053e516c56c88e1716562d6 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 28 Apr 2019 14:00:52 -0500 Subject: nios2: use the generic uncached segment support in dma-direct Stop providing our own arch alloc/free hooks and just expose the segment offset and use the generic dma-direct allocator. Signed-off-by: Christoph Hellwig Acked-by: Ley Foon Tan --- arch/nios2/mm/dma-mapping.c | 34 +++++++++++++++------------------- 1 file changed, 15 insertions(+), 19 deletions(-) (limited to 'arch/nios2/mm') diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c index 4af9e5b5ba1c..9cb238664584 100644 --- a/arch/nios2/mm/dma-mapping.c +++ b/arch/nios2/mm/dma-mapping.c @@ -60,32 +60,28 @@ void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr, } } -void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, - gfp_t gfp, unsigned long attrs) +void arch_dma_prep_coherent(struct page *page, size_t size) { - void *ret; + unsigned long start = (unsigned long)page_address(page); - /* optimized page clearing */ - gfp |= __GFP_ZERO; + flush_dcache_range(start, start + size); +} - if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff)) - gfp |= GFP_DMA; +void *uncached_kernel_address(void *ptr) +{ + unsigned long addr = (unsigned long)ptr; - ret = (void *) __get_free_pages(gfp, get_order(size)); - if (ret != NULL) { - *dma_handle = virt_to_phys(ret); - flush_dcache_range((unsigned long) ret, - (unsigned long) ret + size); - ret = UNCAC_ADDR(ret); - } + addr |= CONFIG_NIOS2_IO_REGION_BASE; - return ret; + return (void *)ptr; } -void arch_dma_free(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle, unsigned long attrs) +void *cached_kernel_address(void *ptr) { - unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr); + unsigned long addr = (unsigned long)ptr; + + addr &= ~CONFIG_NIOS2_IO_REGION_BASE; + addr |= CONFIG_NIOS2_KERNEL_REGION_BASE; - free_pages(addr, get_order(size)); + return (void *)ptr; } -- cgit v1.2.3