/* * 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 <linux/dma-attrs.h> #include <asm/io.h> #include <asm/swiotlb.h> #define DMA_ERROR_CODE (~(dma_addr_t)0x0) /* Some dma direct funcs must be visible for use in other dma_ops */ extern void *dma_direct_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag); extern void dma_direct_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); extern unsigned long get_dma_direct_offset(struct device *dev); #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. */ struct device; extern void *__dma_alloc_coherent(struct device *dev, 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(dev, 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 */ static inline unsigned long device_to_mask(struct device *dev) { if (dev->dma_mask && *dev->dma_mask) return *dev->dma_mask; /* Assume devices without mask can take 32 bit addresses */ return 0xfffffffful; } /* * 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); int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction, struct dma_attrs *attrs); void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction, struct dma_attrs *attrs); int (*dma_supported)(struct device *dev, u64 mask); int (*set_dma_mask)(struct device *dev, u64 dma_mask); dma_addr_t (*map_page)(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction, struct dma_attrs *attrs); void (*unmap_page)(struct device *dev, dma_addr_t dma_address, size_t size, enum dma_data_direction direction, struct dma_attrs *attrs); int (*addr_needs_map)(struct device *dev, dma_addr_t addr, size_t size); #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS void (*sync_single_range_for_cpu)(struct device *hwdev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction); void (*sync_single_range_for_device)(struct device *hwdev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction); void (*sync_sg_for_cpu)(struct device *hwdev, struct scatterlist *sg, int nelems, enum dma_data_direction direction); void (*sync_sg_for_device)(struct device *hwdev, struct scatterlist *sg, int nelems, enum dma_data_direction direction); #endif }; /* * Available generic sets of operations */ #ifdef CONFIG_PPC64 extern struct dma_mapping_ops dma_iommu_ops; #endif extern struct dma_mapping_ops dma_direct_ops; 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)) return NULL; return dev->archdata.dma_ops; } static inline void set_dma_ops(struct device *dev, struct dma_mapping_ops *ops) { dev->archdata.dma_ops = 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); } /* We have our own implementation of pci_set_dma_mask() */ #define HAVE_ARCH_PCI_SET_DMA_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; } /* * map_/unmap_single actually call through to map/unmap_page now that all the * dma_mapping_ops have been converted over. We just have to get the page and * offset to pass through to map_page */ static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *cpu_addr, size_t size, enum dma_data_direction direction, struct dma_attrs *attrs) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); return dma_ops->map_page(dev, virt_to_page(cpu_addr), (unsigned long)cpu_addr % PAGE_SIZE, size, direction, attrs); } static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction, struct dma_attrs *attrs) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); dma_ops->unmap_page(dev, dma_addr, size, direction, attrs); } static inline dma_addr_t dma_map_page_attrs(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction, struct dma_attrs *attrs) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); return dma_ops->map_page(dev, page, offset, size, direction, attrs); } static inline void dma_unmap_page_attrs(struct device *dev, dma_addr_t dma_address, size_t size, enum dma_data_direction direction, struct dma_attrs *attrs) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); dma_ops->unmap_page(dev, dma_address, size, direction, attrs); } static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction, struct dma_attrs *attrs) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); return dma_ops->map_sg(dev, sg, nents, direction, attrs); } static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, int nhwentries, enum dma_data_direction direction, struct dma_attrs *attrs) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); dma_ops->unmap_sg(dev, sg, nhwentries, direction, attrs); } 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) { return dma_map_single_attrs(dev, cpu_addr, size, direction, NULL); } static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction) { dma_unmap_single_attrs(dev, dma_addr, size, direction, NULL); } 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) { return dma_map_page_attrs(dev, page, offset, size, direction, NULL); } static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, enum dma_data_direction direction) { dma_unmap_page_attrs(dev, dma_address, size, direction, NULL); } static inline int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction) { return dma_map_sg_attrs(dev, sg, nents, direction, NULL); } static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, enum dma_data_direction direction) { dma_unmap_sg_attrs(dev, sg, nhwentries, direction, NULL); } #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); if (dma_ops->sync_single_range_for_cpu) dma_ops->sync_single_range_for_cpu(dev, dma_handle, 0, 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) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); if (dma_ops->sync_single_range_for_device) dma_ops->sync_single_range_for_device(dev, dma_handle, 0, size, direction); } static inline void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); if (dma_ops->sync_sg_for_cpu) dma_ops->sync_sg_for_cpu(dev, sgl, nents, direction); } static inline void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); if (dma_ops->sync_sg_for_device) dma_ops->sync_sg_for_device(dev, sgl, nents, direction); } 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) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); if (dma_ops->sync_single_range_for_cpu) dma_ops->sync_single_range_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) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); if (dma_ops->sync_single_range_for_device) dma_ops->sync_single_range_for_device(dev, dma_handle, offset, size, direction); } #else /* CONFIG_PPC_NEED_DMA_SYNC_OPS */ static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction 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) { } static inline void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction) { } static inline void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction) { } 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) { } 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) { } #endif static inline int dma_mapping_error(struct device *dev, 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_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 */