/* * Copyright (C) 2004 IBM * * Implements the generic device dma API for powerpc. * the pci and vio busses */ #ifndef _ASM_DMA_MAPPING_H #define _ASM_DMA_MAPPING_H #ifdef __KERNEL__ #include <linux/types.h> #include <linux/cache.h> /* need struct page definitions */ #include <linux/mm.h> #include <linux/scatterlist.h> #include <asm/io.h> #define DMA_ERROR_CODE (~(dma_addr_t)0x0) #ifdef CONFIG_NOT_COHERENT_CACHE /* * DMA-consistent mapping functions for PowerPCs that don't support * cache snooping. These allocate/free a region of uncached mapped * memory space for use with DMA devices. Alternatively, you could * allocate the space "normally" and use the cache management functions * to ensure it is consistent. */ extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp); extern void __dma_free_coherent(size_t size, void *vaddr); extern void __dma_sync(void *vaddr, size_t size, int direction); extern void __dma_sync_page(struct page *page, unsigned long offset, size_t size, int direction); #else /* ! CONFIG_NOT_COHERENT_CACHE */ /* * Cache coherent cores. */ #define __dma_alloc_coherent(gfp, size, handle) NULL #define __dma_free_coherent(size, addr) ((void)0) #define __dma_sync(addr, size, rw) ((void)0) #define __dma_sync_page(pg, off, sz, rw) ((void)0) #endif /* ! CONFIG_NOT_COHERENT_CACHE */ #ifdef CONFIG_PPC64 /* * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO */ struct dma_mapping_ops { void * (*alloc_coherent)(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag); void (*free_coherent)(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); dma_addr_t (*map_single)(struct device *dev, void *ptr, size_t size, enum dma_data_direction direction); void (*unmap_single)(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction); int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction); void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction); int (*dma_supported)(struct device *dev, u64 mask); int (*set_dma_mask)(struct device *dev, u64 dma_mask); }; static inline struct dma_mapping_ops *get_dma_ops(struct device *dev) { /* We don't handle the NULL dev case for ISA for now. We could * do it via an out of line call but it is not needed for now. The * only ISA DMA device we support is the floppy and we have a hack * in the floppy driver directly to get a device for us. */ if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL)) return NULL; return dev->archdata.dma_ops; } static inline int dma_supported(struct device *dev, u64 mask) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); if (unlikely(dma_ops == NULL)) return 0; if (dma_ops->dma_supported == NULL) return 1; return dma_ops->dma_supported(dev, mask); } static inline int dma_set_mask(struct device *dev, u64 dma_mask) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); if (unlikely(dma_ops == NULL)) return -EIO; if (dma_ops->set_dma_mask != NULL) return dma_ops->set_dma_mask(dev, dma_mask); if (!dev->dma_mask || !dma_supported(dev, dma_mask)) return -EIO; *dev->dma_mask = dma_mask; return 0; } static inline void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); return dma_ops->alloc_coherent(dev, size, dma_handle, flag); } static inline void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t dma_handle) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); dma_ops->free_coherent(dev, size, cpu_addr, dma_handle); } static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr, size_t size, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); return dma_ops->map_single(dev, cpu_addr, size, direction); } static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); dma_ops->unmap_single(dev, dma_addr, size, direction); } static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); return dma_ops->map_single(dev, page_address(page) + offset, size, direction); } static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); dma_ops->unmap_single(dev, dma_address, size, direction); } static inline int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); return dma_ops->map_sg(dev, sg, nents, direction); } static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); dma_ops->unmap_sg(dev, sg, nhwentries, direction); } /* * Available generic sets of operations */ extern struct dma_mapping_ops dma_iommu_ops; extern struct dma_mapping_ops dma_direct_ops; extern unsigned long dma_direct_offset; #else /* CONFIG_PPC64 */ #define dma_supported(dev, mask) (1) static inline int dma_set_mask(struct device *dev, u64 dma_mask) { if (!dev->dma_mask || !dma_supported(dev, mask)) return -EIO; *dev->dma_mask = dma_mask; return 0; } static inline void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t * dma_handle, gfp_t gfp) { #ifdef CONFIG_NOT_COHERENT_CACHE return __dma_alloc_coherent(size, dma_handle, gfp); #else void *ret; /* ignore region specifiers */ gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); if (dev == NULL || dev->coherent_dma_mask < 0xffffffff) gfp |= GFP_DMA; ret = (void *)__get_free_pages(gfp, get_order(size)); if (ret != NULL) { memset(ret, 0, size); *dma_handle = virt_to_bus(ret); } return ret; #endif } static inline void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle) { #ifdef CONFIG_NOT_COHERENT_CACHE __dma_free_coherent(size, vaddr); #else free_pages((unsigned long)vaddr, get_order(size)); #endif } static inline dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction direction) { BUG_ON(direction == DMA_NONE); __dma_sync(ptr, size, direction); return virt_to_bus(ptr); } static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction) { /* We do nothing. */ } static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction) { BUG_ON(direction == DMA_NONE); __dma_sync_page(page, offset, size, direction); return page_to_bus(page) + offset; } static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, enum dma_data_direction direction) { /* We do nothing. */ } static inline int dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction) { struct scatterlist *sg; int i; BUG_ON(direction == DMA_NONE); for_each_sg(sgl, sg, nents, i) { BUG_ON(!sg_page(sg)); __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction); sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset; } return nents; } static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, enum dma_data_direction direction) { /* We don't do anything here. */ } #endif /* CONFIG_PPC64 */ static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) { BUG_ON(direction == DMA_NONE); __dma_sync(bus_to_virt(dma_handle), size, direction); } static inline void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) { BUG_ON(direction == DMA_NONE); __dma_sync(bus_to_virt(dma_handle), size, direction); } static inline void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction) { struct scatterlist *sg; int i; BUG_ON(direction == DMA_NONE); for_each_sg(sgl, sg, nents, i) __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction); } static inline void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction) { struct scatterlist *sg; int i; BUG_ON(direction == DMA_NONE); for_each_sg(sgl, sg, nents, i) __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction); } static inline int dma_mapping_error(dma_addr_t dma_addr) { #ifdef CONFIG_PPC64 return (dma_addr == DMA_ERROR_CODE); #else return 0; #endif } #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) #ifdef CONFIG_NOT_COHERENT_CACHE #define dma_is_consistent(d, h) (0) #else #define dma_is_consistent(d, h) (1) #endif static inline int dma_get_cache_alignment(void) { #ifdef CONFIG_PPC64 /* no easy way to get cache size on all processors, so return * the maximum possible, to be safe */ return (1 << INTERNODE_CACHE_SHIFT); #else /* * 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; #endif } static inline void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction) { /* just sync everything for now */ dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction); } static inline void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction) { /* just sync everything for now */ dma_sync_single_for_device(dev, dma_handle, offset + size, direction); } static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction direction) { BUG_ON(direction == DMA_NONE); __dma_sync(vaddr, size, (int)direction); } #endif /* __KERNEL__ */ #endif /* _ASM_DMA_MAPPING_H */