1/* 2 * Implements the generic device dma API for microblaze and the pci 3 * 4 * Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu> 5 * Copyright (C) 2009-2010 PetaLogix 6 * 7 * This file is subject to the terms and conditions of the GNU General 8 * Public License. See the file COPYING in the main directory of this 9 * archive for more details. 10 * 11 * This file is base on powerpc and x86 dma-mapping.h versions 12 * Copyright (C) 2004 IBM 13 */ 14 15#ifndef _ASM_MICROBLAZE_DMA_MAPPING_H 16#define _ASM_MICROBLAZE_DMA_MAPPING_H 17 18/* 19 * See Documentation/DMA-API-HOWTO.txt and 20 * Documentation/DMA-API.txt for documentation. 21 */ 22 23#include <linux/types.h> 24#include <linux/cache.h> 25#include <linux/mm.h> 26#include <linux/scatterlist.h> 27#include <linux/dma-debug.h> 28#include <linux/dma-attrs.h> 29#include <asm/io.h> 30#include <asm-generic/dma-coherent.h> 31#include <asm/cacheflush.h> 32 33#define DMA_ERROR_CODE (~(dma_addr_t)0x0) 34 35#define __dma_alloc_coherent(dev, gfp, size, handle) NULL 36#define __dma_free_coherent(size, addr) ((void)0) 37 38static inline unsigned long device_to_mask(struct device *dev) 39{ 40 if (dev->dma_mask && *dev->dma_mask) 41 return *dev->dma_mask; 42 /* Assume devices without mask can take 32 bit addresses */ 43 return 0xfffffffful; 44} 45 46extern struct dma_map_ops *dma_ops; 47 48/* 49 * Available generic sets of operations 50 */ 51extern struct dma_map_ops dma_direct_ops; 52 53static inline struct dma_map_ops *get_dma_ops(struct device *dev) 54{ 55 /* We don't handle the NULL dev case for ISA for now. We could 56 * do it via an out of line call but it is not needed for now. The 57 * only ISA DMA device we support is the floppy and we have a hack 58 * in the floppy driver directly to get a device for us. 59 */ 60 if (unlikely(!dev) || !dev->archdata.dma_ops) 61 return NULL; 62 63 return dev->archdata.dma_ops; 64} 65 66static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops) 67{ 68 dev->archdata.dma_ops = ops; 69} 70 71static inline int dma_supported(struct device *dev, u64 mask) 72{ 73 struct dma_map_ops *ops = get_dma_ops(dev); 74 75 if (unlikely(!ops)) 76 return 0; 77 if (!ops->dma_supported) 78 return 1; 79 return ops->dma_supported(dev, mask); 80} 81 82static inline int dma_set_mask(struct device *dev, u64 dma_mask) 83{ 84 struct dma_map_ops *ops = get_dma_ops(dev); 85 86 if (unlikely(ops == NULL)) 87 return -EIO; 88 if (ops->set_dma_mask) 89 return ops->set_dma_mask(dev, dma_mask); 90 if (!dev->dma_mask || !dma_supported(dev, dma_mask)) 91 return -EIO; 92 *dev->dma_mask = dma_mask; 93 return 0; 94} 95 96#include <asm-generic/dma-mapping-common.h> 97 98static inline void __dma_sync(unsigned long paddr, 99 size_t size, enum dma_data_direction direction) 100{ 101 switch (direction) { 102 case DMA_TO_DEVICE: 103 case DMA_BIDIRECTIONAL: 104 flush_dcache_range(paddr, paddr + size); 105 break; 106 case DMA_FROM_DEVICE: 107 invalidate_dcache_range(paddr, paddr + size); 108 break; 109 default: 110 BUG(); 111 } 112} 113 114static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 115{ 116 struct dma_map_ops *ops = get_dma_ops(dev); 117 if (ops->mapping_error) 118 return ops->mapping_error(dev, dma_addr); 119 120 return (dma_addr == DMA_ERROR_CODE); 121} 122 123#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) 124#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) 125 126#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL) 127 128static inline void *dma_alloc_attrs(struct device *dev, size_t size, 129 dma_addr_t *dma_handle, gfp_t flag, 130 struct dma_attrs *attrs) 131{ 132 struct dma_map_ops *ops = get_dma_ops(dev); 133 void *memory; 134 135 BUG_ON(!ops); 136 137 memory = ops->alloc(dev, size, dma_handle, flag, attrs); 138 139 debug_dma_alloc_coherent(dev, size, *dma_handle, memory); 140 return memory; 141} 142 143#define dma_free_coherent(d,s,c,h) dma_free_attrs(d, s, c, h, NULL) 144 145static inline void dma_free_attrs(struct device *dev, size_t size, 146 void *cpu_addr, dma_addr_t dma_handle, 147 struct dma_attrs *attrs) 148{ 149 struct dma_map_ops *ops = get_dma_ops(dev); 150 151 BUG_ON(!ops); 152 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); 153 ops->free(dev, size, cpu_addr, dma_handle, attrs); 154} 155 156static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, 157 enum dma_data_direction direction) 158{ 159 BUG_ON(direction == DMA_NONE); 160 __dma_sync(virt_to_phys(vaddr), size, (int)direction); 161} 162 163#endif /* _ASM_MICROBLAZE_DMA_MAPPING_H */ 164