1/* 2 * Copyright (C) 2012 ARM Ltd. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16#ifndef __ASM_DMA_MAPPING_H 17#define __ASM_DMA_MAPPING_H 18 19#ifdef __KERNEL__ 20 21#include <linux/types.h> 22#include <linux/vmalloc.h> 23 24#include <asm-generic/dma-coherent.h> 25 26#include <xen/xen.h> 27#include <asm/xen/hypervisor.h> 28 29#define DMA_ERROR_CODE (~(dma_addr_t)0) 30extern struct dma_map_ops *dma_ops; 31extern struct dma_map_ops coherent_swiotlb_dma_ops; 32extern struct dma_map_ops noncoherent_swiotlb_dma_ops; 33 34static inline struct dma_map_ops *__generic_dma_ops(struct device *dev) 35{ 36 if (unlikely(!dev) || !dev->archdata.dma_ops) 37 return dma_ops; 38 else 39 return dev->archdata.dma_ops; 40} 41 42static inline struct dma_map_ops *get_dma_ops(struct device *dev) 43{ 44 if (xen_initial_domain()) 45 return xen_dma_ops; 46 else 47 return __generic_dma_ops(dev); 48} 49 50static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops) 51{ 52 dev->archdata.dma_ops = ops; 53} 54 55static inline int set_arch_dma_coherent_ops(struct device *dev) 56{ 57 set_dma_ops(dev, &coherent_swiotlb_dma_ops); 58 return 0; 59} 60#define set_arch_dma_coherent_ops set_arch_dma_coherent_ops 61 62#include <asm-generic/dma-mapping-common.h> 63 64static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) 65{ 66 return (dma_addr_t)paddr; 67} 68 69static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) 70{ 71 return (phys_addr_t)dev_addr; 72} 73 74static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr) 75{ 76 struct dma_map_ops *ops = get_dma_ops(dev); 77 debug_dma_mapping_error(dev, dev_addr); 78 return ops->mapping_error(dev, dev_addr); 79} 80 81static inline int dma_supported(struct device *dev, u64 mask) 82{ 83 struct dma_map_ops *ops = get_dma_ops(dev); 84 return ops->dma_supported(dev, mask); 85} 86 87static inline int dma_set_mask(struct device *dev, u64 mask) 88{ 89 if (!dev->dma_mask || !dma_supported(dev, mask)) 90 return -EIO; 91 *dev->dma_mask = mask; 92 93 return 0; 94} 95 96static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) 97{ 98 if (!dev->dma_mask) 99 return 0; 100 101 return addr + size - 1 <= *dev->dma_mask; 102} 103 104static inline void dma_mark_clean(void *addr, size_t size) 105{ 106} 107 108#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL) 109#define dma_free_coherent(d, s, h, f) dma_free_attrs(d, s, h, f, NULL) 110 111static inline void *dma_alloc_attrs(struct device *dev, size_t size, 112 dma_addr_t *dma_handle, gfp_t flags, 113 struct dma_attrs *attrs) 114{ 115 struct dma_map_ops *ops = get_dma_ops(dev); 116 void *vaddr; 117 118 if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr)) 119 return vaddr; 120 121 vaddr = ops->alloc(dev, size, dma_handle, flags, attrs); 122 debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr); 123 return vaddr; 124} 125 126static inline void dma_free_attrs(struct device *dev, size_t size, 127 void *vaddr, dma_addr_t dev_addr, 128 struct dma_attrs *attrs) 129{ 130 struct dma_map_ops *ops = get_dma_ops(dev); 131 132 if (dma_release_from_coherent(dev, get_order(size), vaddr)) 133 return; 134 135 debug_dma_free_coherent(dev, size, vaddr, dev_addr); 136 ops->free(dev, size, vaddr, dev_addr, attrs); 137} 138 139/* 140 * There is no dma_cache_sync() implementation, so just return NULL here. 141 */ 142static inline void *dma_alloc_noncoherent(struct device *dev, size_t size, 143 dma_addr_t *handle, gfp_t flags) 144{ 145 return NULL; 146} 147 148static inline void dma_free_noncoherent(struct device *dev, size_t size, 149 void *cpu_addr, dma_addr_t handle) 150{ 151} 152 153#endif /* __KERNEL__ */ 154#endif /* __ASM_DMA_MAPPING_H */ 155