/* * 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 <linux/dma-debug.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, struct dma_attrs *attrs); extern void dma_direct_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs); extern int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t handle, size_t size, struct dma_attrs *attrs); #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); extern unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr); #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; } /* * Available generic sets of operations */ #ifdef CONFIG_PPC64 extern struct dma_map_ops dma_iommu_ops; #endif extern struct dma_map_ops dma_direct_ops; static inline struct dma_map_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_map_ops *ops) { dev->archdata.dma_ops = ops; } /* * get_dma_offset() * * Get the dma offset on configurations where the dma address can be determined * from the physical address by looking at a simple offset. Direct dma and * swiotlb use this function, but it is typically not used by implementations * with an iommu. */ static inline dma_addr_t get_dma_offset(struct device *dev) { if (dev) return dev->archdata.dma_data.dma_offset; return PCI_DRAM_OFFSET; } static inline void set_dma_offset(struct device *dev, dma_addr_t off) { if (dev) dev->archdata.dma_data.dma_offset = off; } /* this will be removed soon */ #define flush_write_buffers() #include <asm-generic/dma-mapping-common.h> static inline int dma_supported(struct device *dev, u64 mask) { struct dma_map_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); } extern int dma_set_mask(struct device *dev, u64 dma_mask); #define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL) static inline void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag, struct dma_attrs *attrs) { struct dma_map_ops *dma_ops = get_dma_ops(dev); void *cpu_addr; BUG_ON(!dma_ops); cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs); debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr); return cpu_addr; } #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL) static inline void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, dma_addr_t dma_handle, struct dma_attrs *attrs) { struct dma_map_ops *dma_ops = get_dma_ops(dev); BUG_ON(!dma_ops); debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); dma_ops->free(dev, size, cpu_addr, dma_handle, attrs); } static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { struct dma_map_ops *dma_ops = get_dma_ops(dev); if (dma_ops->mapping_error) return dma_ops->mapping_error(dev, dma_addr); #ifdef CONFIG_PPC64 return (dma_addr == DMA_ERROR_CODE); #else return 0; #endif } static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) { #ifdef CONFIG_SWIOTLB struct dev_archdata *sd = &dev->archdata; if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr) return 0; #endif if (!dev->dma_mask) return 0; return addr + size - 1 <= *dev->dma_mask; } static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) { return paddr + get_dma_offset(dev); } static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) { return daddr - get_dma_offset(dev); } #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) #define ARCH_HAS_DMA_MMAP_COHERENT 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 */