1/* 2 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> 3 * Copyright (C) 2009 Wind River Systems Inc 4 * 5 * This file is subject to the terms and conditions of the GNU General 6 * Public License. See the file COPYING in the main directory of this 7 * archive for more details. 8 */ 9 10#ifndef _ASM_NIOS2_DMA_MAPPING_H 11#define _ASM_NIOS2_DMA_MAPPING_H 12 13#include <linux/scatterlist.h> 14#include <linux/cache.h> 15#include <asm/cacheflush.h> 16 17static inline void __dma_sync_for_device(void *vaddr, size_t size, 18 enum dma_data_direction direction) 19{ 20 switch (direction) { 21 case DMA_FROM_DEVICE: 22 invalidate_dcache_range((unsigned long)vaddr, 23 (unsigned long)(vaddr + size)); 24 break; 25 case DMA_TO_DEVICE: 26 /* 27 * We just need to flush the caches here , but Nios2 flush 28 * instruction will do both writeback and invalidate. 29 */ 30 case DMA_BIDIRECTIONAL: /* flush and invalidate */ 31 flush_dcache_range((unsigned long)vaddr, 32 (unsigned long)(vaddr + size)); 33 break; 34 default: 35 BUG(); 36 } 37} 38 39static inline void __dma_sync_for_cpu(void *vaddr, size_t size, 40 enum dma_data_direction direction) 41{ 42 switch (direction) { 43 case DMA_BIDIRECTIONAL: 44 case DMA_FROM_DEVICE: 45 invalidate_dcache_range((unsigned long)vaddr, 46 (unsigned long)(vaddr + size)); 47 break; 48 case DMA_TO_DEVICE: 49 break; 50 default: 51 BUG(); 52 } 53} 54 55#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) 56#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) 57 58void *dma_alloc_coherent(struct device *dev, size_t size, 59 dma_addr_t *dma_handle, gfp_t flag); 60 61void dma_free_coherent(struct device *dev, size_t size, 62 void *vaddr, dma_addr_t dma_handle); 63 64static inline dma_addr_t dma_map_single(struct device *dev, void *ptr, 65 size_t size, 66 enum dma_data_direction direction) 67{ 68 BUG_ON(!valid_dma_direction(direction)); 69 __dma_sync_for_device(ptr, size, direction); 70 return virt_to_phys(ptr); 71} 72 73static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, 74 size_t size, enum dma_data_direction direction) 75{ 76} 77 78extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, 79 enum dma_data_direction direction); 80extern dma_addr_t dma_map_page(struct device *dev, struct page *page, 81 unsigned long offset, size_t size, enum dma_data_direction direction); 82extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address, 83 size_t size, enum dma_data_direction direction); 84extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg, 85 int nhwentries, enum dma_data_direction direction); 86extern void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, 87 size_t size, enum dma_data_direction direction); 88extern void dma_sync_single_for_device(struct device *dev, 89 dma_addr_t dma_handle, size_t size, enum dma_data_direction direction); 90extern void dma_sync_single_range_for_cpu(struct device *dev, 91 dma_addr_t dma_handle, unsigned long offset, size_t size, 92 enum dma_data_direction direction); 93extern void dma_sync_single_range_for_device(struct device *dev, 94 dma_addr_t dma_handle, unsigned long offset, size_t size, 95 enum dma_data_direction direction); 96extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, 97 int nelems, enum dma_data_direction direction); 98extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, 99 int nelems, enum dma_data_direction direction); 100 101static inline int dma_supported(struct device *dev, u64 mask) 102{ 103 return 1; 104} 105 106static inline int dma_set_mask(struct device *dev, u64 mask) 107{ 108 if (!dev->dma_mask || !dma_supported(dev, mask)) 109 return -EIO; 110 111 *dev->dma_mask = mask; 112 113 return 0; 114} 115 116static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 117{ 118 return 0; 119} 120 121/* 122* dma_alloc_noncoherent() returns non-cacheable memory, so there's no need to 123* do any flushing here. 124*/ 125static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, 126 enum dma_data_direction direction) 127{ 128} 129 130/* drivers/base/dma-mapping.c */ 131extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, 132 void *cpu_addr, dma_addr_t dma_addr, size_t size); 133extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, 134 void *cpu_addr, dma_addr_t dma_addr, 135 size_t size); 136 137#define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s) 138#define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s) 139 140#endif /* _ASM_NIOS2_DMA_MAPPING_H */ 141