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Linux/arch/arm64/include/asm/dma-mapping.h

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  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)
 30 extern struct dma_map_ops *dma_ops;
 31 
 32 static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
 33 {
 34         if (unlikely(!dev) || !dev->archdata.dma_ops)
 35                 return dma_ops;
 36         else
 37                 return dev->archdata.dma_ops;
 38 }
 39 
 40 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 41 {
 42         if (xen_initial_domain())
 43                 return xen_dma_ops;
 44         else
 45                 return __generic_dma_ops(dev);
 46 }
 47 
 48 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
 49                                       struct iommu_ops *iommu, bool coherent)
 50 {
 51         dev->archdata.dma_coherent = coherent;
 52 }
 53 #define arch_setup_dma_ops      arch_setup_dma_ops
 54 
 55 /* do not use this function in a driver */
 56 static inline bool is_device_dma_coherent(struct device *dev)
 57 {
 58         if (!dev)
 59                 return false;
 60         return dev->archdata.dma_coherent;
 61 }
 62 
 63 #include <asm-generic/dma-mapping-common.h>
 64 
 65 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 66 {
 67         return (dma_addr_t)paddr;
 68 }
 69 
 70 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
 71 {
 72         return (phys_addr_t)dev_addr;
 73 }
 74 
 75 static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
 76 {
 77         struct dma_map_ops *ops = get_dma_ops(dev);
 78         debug_dma_mapping_error(dev, dev_addr);
 79         return ops->mapping_error(dev, dev_addr);
 80 }
 81 
 82 static inline int dma_supported(struct device *dev, u64 mask)
 83 {
 84         struct dma_map_ops *ops = get_dma_ops(dev);
 85         return ops->dma_supported(dev, mask);
 86 }
 87 
 88 static inline int dma_set_mask(struct device *dev, u64 mask)
 89 {
 90         if (!dev->dma_mask || !dma_supported(dev, mask))
 91                 return -EIO;
 92         *dev->dma_mask = mask;
 93 
 94         return 0;
 95 }
 96 
 97 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 98 {
 99         if (!dev->dma_mask)
100                 return 0;
101 
102         return addr + size - 1 <= *dev->dma_mask;
103 }
104 
105 static inline void dma_mark_clean(void *addr, size_t size)
106 {
107 }
108 
109 #define dma_alloc_coherent(d, s, h, f)  dma_alloc_attrs(d, s, h, f, NULL)
110 #define dma_free_coherent(d, s, h, f)   dma_free_attrs(d, s, h, f, NULL)
111 
112 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
113                                     dma_addr_t *dma_handle, gfp_t flags,
114                                     struct dma_attrs *attrs)
115 {
116         struct dma_map_ops *ops = get_dma_ops(dev);
117         void *vaddr;
118 
119         if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
120                 return vaddr;
121 
122         vaddr = ops->alloc(dev, size, dma_handle, flags, attrs);
123         debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
124         return vaddr;
125 }
126 
127 static inline void dma_free_attrs(struct device *dev, size_t size,
128                                   void *vaddr, dma_addr_t dev_addr,
129                                   struct dma_attrs *attrs)
130 {
131         struct dma_map_ops *ops = get_dma_ops(dev);
132 
133         if (dma_release_from_coherent(dev, get_order(size), vaddr))
134                 return;
135 
136         debug_dma_free_coherent(dev, size, vaddr, dev_addr);
137         ops->free(dev, size, vaddr, dev_addr, attrs);
138 }
139 
140 /*
141  * There is no dma_cache_sync() implementation, so just return NULL here.
142  */
143 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
144                                           dma_addr_t *handle, gfp_t flags)
145 {
146         return NULL;
147 }
148 
149 static inline void dma_free_noncoherent(struct device *dev, size_t size,
150                                         void *cpu_addr, dma_addr_t handle)
151 {
152 }
153 
154 #endif  /* __KERNEL__ */
155 #endif  /* __ASM_DMA_MAPPING_H */
156 

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