#ifndef __ASM_SH_DMA_MAPPING_H #define __ASM_SH_DMA_MAPPING_H #include <linux/mm.h> #include <asm/scatterlist.h> #include <asm/io.h> struct pci_dev; extern void *consistent_alloc(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle); extern void consistent_free(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle); #define dma_supported(dev, mask) (1) static inline int dma_set_mask(struct device *dev, u64 mask) { if (!dev->dma_mask || !dma_supported(dev, mask)) return -EIO; *dev->dma_mask = mask; return 0; } static inline void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) { return consistent_alloc(NULL, size, dma_handle); } static inline void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle) { consistent_free(NULL, size, vaddr, dma_handle); } static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction dir) { dma_cache_wback_inv((unsigned long)vaddr, size); } static inline dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction dir) { #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT) if (dev->bus == &pci_bus_type) return virt_to_bus(ptr); #endif dma_cache_sync(ptr, size, dir); return virt_to_bus(ptr); } #define dma_unmap_single(dev, addr, size, dir) do { } while (0) static inline int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir) { int i; for (i = 0; i < nents; i++) { #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT) dma_cache_sync(page_address(sg[i].page) + sg[i].offset, sg[i].length, dir); #endif sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset; } return nents; } #define dma_unmap_sg(dev, sg, nents, dir) do { } while (0) static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir) { return dma_map_single(dev, page_address(page) + offset, size, dir); } static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, enum dma_data_direction dir) { dma_unmap_single(dev, dma_address, size, dir); } static inline void dma_sync_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir) { #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT) if (dev->bus == &pci_bus_type) return; #endif dma_cache_sync(bus_to_virt(dma_handle), size, dir); } static inline void dma_sync_single_range(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction dir) { #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT) if (dev->bus == &pci_bus_type) return; #endif dma_cache_sync(bus_to_virt(dma_handle) + offset, size, dir); } static inline void dma_sync_sg(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction dir) { int i; for (i = 0; i < nelems; i++) { #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT) dma_cache_sync(page_address(sg[i].page) + sg[i].offset, sg[i].length, dir); #endif sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset; } } static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir) { dma_sync_single(dev, dma_handle, size, dir); } static inline void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir) { dma_sync_single(dev, dma_handle, size, dir); } static inline void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction dir) { dma_sync_sg(dev, sg, nelems, dir); } static inline void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction dir) { dma_sync_sg(dev, sg, nelems, dir); } static inline int dma_get_cache_alignment(void) { /* * Each processor family will define its own L1_CACHE_SHIFT, * L1_CACHE_BYTES wraps to this, so this is always safe. */ return L1_CACHE_BYTES; } static inline int dma_mapping_error(dma_addr_t dma_addr) { return dma_addr == 0; } #endif /* __ASM_SH_DMA_MAPPING_H */