1/* 2 * Copyright 2010 Tilera Corporation. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation, version 2. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 11 * NON INFRINGEMENT. See the GNU General Public License for 12 * more details. 13 */ 14 15#ifndef _ASM_TILE_DMA_MAPPING_H 16#define _ASM_TILE_DMA_MAPPING_H 17 18#include <linux/mm.h> 19#include <linux/scatterlist.h> 20#include <linux/cache.h> 21#include <linux/io.h> 22 23#ifdef __tilegx__ 24#define ARCH_HAS_DMA_GET_REQUIRED_MASK 25#endif 26 27extern struct dma_map_ops *tile_dma_map_ops; 28extern struct dma_map_ops *gx_pci_dma_map_ops; 29extern struct dma_map_ops *gx_legacy_pci_dma_map_ops; 30extern struct dma_map_ops *gx_hybrid_pci_dma_map_ops; 31 32static inline struct dma_map_ops *get_dma_ops(struct device *dev) 33{ 34 if (dev && dev->archdata.dma_ops) 35 return dev->archdata.dma_ops; 36 else 37 return tile_dma_map_ops; 38} 39 40static inline dma_addr_t get_dma_offset(struct device *dev) 41{ 42 return dev->archdata.dma_offset; 43} 44 45static inline void set_dma_offset(struct device *dev, dma_addr_t off) 46{ 47 dev->archdata.dma_offset = off; 48} 49 50static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) 51{ 52 return paddr; 53} 54 55static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) 56{ 57 return daddr; 58} 59 60static inline void dma_mark_clean(void *addr, size_t size) {} 61 62#include <asm-generic/dma-mapping-common.h> 63 64static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops) 65{ 66 dev->archdata.dma_ops = ops; 67} 68 69static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) 70{ 71 if (!dev->dma_mask) 72 return 0; 73 74 return addr + size - 1 <= *dev->dma_mask; 75} 76 77static inline int 78dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 79{ 80 debug_dma_mapping_error(dev, dma_addr); 81 return get_dma_ops(dev)->mapping_error(dev, dma_addr); 82} 83 84static inline int 85dma_supported(struct device *dev, u64 mask) 86{ 87 return get_dma_ops(dev)->dma_supported(dev, mask); 88} 89 90static inline int 91dma_set_mask(struct device *dev, u64 mask) 92{ 93 struct dma_map_ops *dma_ops = get_dma_ops(dev); 94 95 /* 96 * For PCI devices with 64-bit DMA addressing capability, promote 97 * the dma_ops to hybrid, with the consistent memory DMA space limited 98 * to 32-bit. For 32-bit capable devices, limit the streaming DMA 99 * address range to max_direct_dma_addr. 100 */ 101 if (dma_ops == gx_pci_dma_map_ops || 102 dma_ops == gx_hybrid_pci_dma_map_ops || 103 dma_ops == gx_legacy_pci_dma_map_ops) { 104 if (mask == DMA_BIT_MASK(64) && 105 dma_ops == gx_legacy_pci_dma_map_ops) 106 set_dma_ops(dev, gx_hybrid_pci_dma_map_ops); 107 else if (mask > dev->archdata.max_direct_dma_addr) 108 mask = dev->archdata.max_direct_dma_addr; 109 } 110 111 if (!dev->dma_mask || !dma_supported(dev, mask)) 112 return -EIO; 113 114 *dev->dma_mask = mask; 115 116 return 0; 117} 118 119static inline void *dma_alloc_attrs(struct device *dev, size_t size, 120 dma_addr_t *dma_handle, gfp_t flag, 121 struct dma_attrs *attrs) 122{ 123 struct dma_map_ops *dma_ops = get_dma_ops(dev); 124 void *cpu_addr; 125 126 cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs); 127 128 debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr); 129 130 return cpu_addr; 131} 132 133static inline void dma_free_attrs(struct device *dev, size_t size, 134 void *cpu_addr, dma_addr_t dma_handle, 135 struct dma_attrs *attrs) 136{ 137 struct dma_map_ops *dma_ops = get_dma_ops(dev); 138 139 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); 140 141 dma_ops->free(dev, size, cpu_addr, dma_handle, attrs); 142} 143 144#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL) 145#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL) 146#define dma_free_coherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL) 147#define dma_free_noncoherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL) 148 149/* 150 * dma_alloc_noncoherent() is #defined to return coherent memory, 151 * so there's no need to do any flushing here. 152 */ 153static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, 154 enum dma_data_direction direction) 155{ 156} 157 158#endif /* _ASM_TILE_DMA_MAPPING_H */ 159