| /* |
| * 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-debug.h> |
| #include <asm/io.h> |
| #include <asm/swiotlb.h> |
| |
| #ifdef CONFIG_PPC64 |
| #define DMA_ERROR_CODE (~(dma_addr_t)0x0) |
| #endif |
| |
| /* 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, |
| unsigned long attrs); |
| extern void __dma_direct_free_coherent(struct device *dev, size_t size, |
| void *vaddr, dma_addr_t dma_handle, |
| unsigned long 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, unsigned long 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 const struct dma_map_ops dma_direct_ops; |
| |
| static inline const 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, const 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_offset; |
| |
| return PCI_DRAM_OFFSET; |
| } |
| |
| static inline void set_dma_offset(struct device *dev, dma_addr_t off) |
| { |
| if (dev) |
| dev->archdata.dma_offset = off; |
| } |
| |
| /* this will be removed soon */ |
| #define flush_write_buffers() |
| |
| #define HAVE_ARCH_DMA_SET_MASK 1 |
| extern int dma_set_mask(struct device *dev, u64 dma_mask); |
| |
| extern int __dma_set_mask(struct device *dev, u64 dma_mask); |
| extern u64 __dma_get_required_mask(struct device *dev); |
| |
| 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 false; |
| #endif |
| |
| if (!dev->dma_mask) |
| return false; |
| |
| 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 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 */ |