X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;f=arch%2Farm%2Fmm%2Fdma-mapping-nommu.c;h=cfd9c933d2f09c6a80d86c9b50959728498cb37a;hb=7b7699c09f66f180b9a8a5010df352acb8683bfa;hp=6bfd2b8845050bd775c26e00a9a94562b539354f;hpb=f4b936f5d6fd0625a78a7b4b92e98739a2bdb6f7;p=linux-2.6-microblaze.git diff --git a/arch/arm/mm/dma-mapping-nommu.c b/arch/arm/mm/dma-mapping-nommu.c index 6bfd2b884505..cfd9c933d2f0 100644 --- a/arch/arm/mm/dma-mapping-nommu.c +++ b/arch/arm/mm/dma-mapping-nommu.c @@ -5,12 +5,7 @@ * Copyright (C) 2000-2004 Russell King */ -#include -#include -#include #include -#include - #include #include #include @@ -18,65 +13,8 @@ #include "dma.h" -/* - * The generic direct mapping code is used if - * - MMU/MPU is off - * - cpu is v7m w/o cache support - * - device is coherent - * otherwise arm_nommu_dma_ops is used. - * - * arm_nommu_dma_ops rely on consistent DMA memory (please, refer to - * [1] on how to declare such memory). - * - * [1] Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt - */ - -static void *arm_nommu_dma_alloc(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp, - unsigned long attrs) - -{ - void *ret = dma_alloc_from_global_coherent(dev, size, dma_handle); - - /* - * dma_alloc_from_global_coherent() may fail because: - * - * - no consistent DMA region has been defined, so we can't - * continue. - * - there is no space left in consistent DMA region, so we - * only can fallback to generic allocator if we are - * advertised that consistency is not required. - */ - - WARN_ON_ONCE(ret == NULL); - return ret; -} - -static void arm_nommu_dma_free(struct device *dev, size_t size, - void *cpu_addr, dma_addr_t dma_addr, - unsigned long attrs) -{ - int ret = dma_release_from_global_coherent(get_order(size), cpu_addr); - - WARN_ON_ONCE(ret == 0); -} - -static int arm_nommu_dma_mmap(struct device *dev, struct vm_area_struct *vma, - void *cpu_addr, dma_addr_t dma_addr, size_t size, - unsigned long attrs) -{ - int ret; - - if (dma_mmap_from_global_coherent(vma, cpu_addr, size, &ret)) - return ret; - if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret)) - return ret; - return -ENXIO; -} - - -static void __dma_page_cpu_to_dev(phys_addr_t paddr, size_t size, - enum dma_data_direction dir) +void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, + enum dma_data_direction dir) { dmac_map_area(__va(paddr), size, dir); @@ -86,8 +24,8 @@ static void __dma_page_cpu_to_dev(phys_addr_t paddr, size_t size, outer_clean_range(paddr, paddr + size); } -static void __dma_page_dev_to_cpu(phys_addr_t paddr, size_t size, - enum dma_data_direction dir) +void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, + enum dma_data_direction dir) { if (dir != DMA_TO_DEVICE) { outer_inv_range(paddr, paddr + size); @@ -95,102 +33,6 @@ static void __dma_page_dev_to_cpu(phys_addr_t paddr, size_t size, } } -static dma_addr_t arm_nommu_dma_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - unsigned long attrs) -{ - dma_addr_t handle = page_to_phys(page) + offset; - - __dma_page_cpu_to_dev(handle, size, dir); - - return handle; -} - -static void arm_nommu_dma_unmap_page(struct device *dev, dma_addr_t handle, - size_t size, enum dma_data_direction dir, - unsigned long attrs) -{ - __dma_page_dev_to_cpu(handle, size, dir); -} - - -static int arm_nommu_dma_map_sg(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction dir, - unsigned long attrs) -{ - int i; - struct scatterlist *sg; - - for_each_sg(sgl, sg, nents, i) { - sg_dma_address(sg) = sg_phys(sg); - sg_dma_len(sg) = sg->length; - __dma_page_cpu_to_dev(sg_dma_address(sg), sg_dma_len(sg), dir); - } - - return nents; -} - -static void arm_nommu_dma_unmap_sg(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction dir, - unsigned long attrs) -{ - struct scatterlist *sg; - int i; - - for_each_sg(sgl, sg, nents, i) - __dma_page_dev_to_cpu(sg_dma_address(sg), sg_dma_len(sg), dir); -} - -static void arm_nommu_dma_sync_single_for_device(struct device *dev, - dma_addr_t handle, size_t size, enum dma_data_direction dir) -{ - __dma_page_cpu_to_dev(handle, size, dir); -} - -static void arm_nommu_dma_sync_single_for_cpu(struct device *dev, - dma_addr_t handle, size_t size, enum dma_data_direction dir) -{ - __dma_page_cpu_to_dev(handle, size, dir); -} - -static void arm_nommu_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction dir) -{ - struct scatterlist *sg; - int i; - - for_each_sg(sgl, sg, nents, i) - __dma_page_cpu_to_dev(sg_dma_address(sg), sg_dma_len(sg), dir); -} - -static void arm_nommu_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction dir) -{ - struct scatterlist *sg; - int i; - - for_each_sg(sgl, sg, nents, i) - __dma_page_dev_to_cpu(sg_dma_address(sg), sg_dma_len(sg), dir); -} - -const struct dma_map_ops arm_nommu_dma_ops = { - .alloc = arm_nommu_dma_alloc, - .free = arm_nommu_dma_free, - .alloc_pages = dma_direct_alloc_pages, - .free_pages = dma_direct_free_pages, - .mmap = arm_nommu_dma_mmap, - .map_page = arm_nommu_dma_map_page, - .unmap_page = arm_nommu_dma_unmap_page, - .map_sg = arm_nommu_dma_map_sg, - .unmap_sg = arm_nommu_dma_unmap_sg, - .sync_single_for_device = arm_nommu_dma_sync_single_for_device, - .sync_single_for_cpu = arm_nommu_dma_sync_single_for_cpu, - .sync_sg_for_device = arm_nommu_dma_sync_sg_for_device, - .sync_sg_for_cpu = arm_nommu_dma_sync_sg_for_cpu, -}; -EXPORT_SYMBOL(arm_nommu_dma_ops); - void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, const struct iommu_ops *iommu, bool coherent) { @@ -201,14 +43,11 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, * enough to check if MPU is in use or not since in absense of * MPU system memory map is used. */ - dev->archdata.dma_coherent = (cacheid) ? coherent : true; + dev->dma_coherent = cacheid ? coherent : true; } else { /* * Assume coherent DMA in case MMU/MPU has not been set up. */ - dev->archdata.dma_coherent = (get_cr() & CR_M) ? coherent : true; + dev->dma_coherent = (get_cr() & CR_M) ? coherent : true; } - - if (!dev->archdata.dma_coherent) - set_dma_ops(dev, &arm_nommu_dma_ops); }