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

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  1 #ifndef ASMARM_DMA_MAPPING_H
  2 #define ASMARM_DMA_MAPPING_H
  3 
  4 #ifdef __KERNEL__
  5 
  6 #include <linux/mm_types.h>
  7 #include <linux/scatterlist.h>
  8 #include <linux/dma-attrs.h>
  9 #include <linux/dma-debug.h>
 10 
 11 #include <asm/memory.h>
 12 
 13 #include <xen/xen.h>
 14 #include <asm/xen/hypervisor.h>
 15 
 16 #define DMA_ERROR_CODE  (~(dma_addr_t)0x0)
 17 extern struct dma_map_ops arm_dma_ops;
 18 extern struct dma_map_ops arm_coherent_dma_ops;
 19 
 20 static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
 21 {
 22         if (dev && dev->archdata.dma_ops)
 23                 return dev->archdata.dma_ops;
 24         return &arm_dma_ops;
 25 }
 26 
 27 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 28 {
 29         if (xen_initial_domain())
 30                 return xen_dma_ops;
 31         else
 32                 return __generic_dma_ops(dev);
 33 }
 34 
 35 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
 36 {
 37         BUG_ON(!dev);
 38         dev->archdata.dma_ops = ops;
 39 }
 40 
 41 #define HAVE_ARCH_DMA_SUPPORTED 1
 42 extern int dma_supported(struct device *dev, u64 mask);
 43 
 44 #ifdef __arch_page_to_dma
 45 #error Please update to __arch_pfn_to_dma
 46 #endif
 47 
 48 /*
 49  * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
 50  * functions used internally by the DMA-mapping API to provide DMA
 51  * addresses. They must not be used by drivers.
 52  */
 53 #ifndef __arch_pfn_to_dma
 54 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
 55 {
 56         if (dev)
 57                 pfn -= dev->dma_pfn_offset;
 58         return (dma_addr_t)__pfn_to_bus(pfn);
 59 }
 60 
 61 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
 62 {
 63         unsigned long pfn = __bus_to_pfn(addr);
 64 
 65         if (dev)
 66                 pfn += dev->dma_pfn_offset;
 67 
 68         return pfn;
 69 }
 70 
 71 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
 72 {
 73         if (dev) {
 74                 unsigned long pfn = dma_to_pfn(dev, addr);
 75 
 76                 return phys_to_virt(__pfn_to_phys(pfn));
 77         }
 78 
 79         return (void *)__bus_to_virt((unsigned long)addr);
 80 }
 81 
 82 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
 83 {
 84         if (dev)
 85                 return pfn_to_dma(dev, virt_to_pfn(addr));
 86 
 87         return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
 88 }
 89 
 90 #else
 91 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
 92 {
 93         return __arch_pfn_to_dma(dev, pfn);
 94 }
 95 
 96 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
 97 {
 98         return __arch_dma_to_pfn(dev, addr);
 99 }
100 
101 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
102 {
103         return __arch_dma_to_virt(dev, addr);
104 }
105 
106 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
107 {
108         return __arch_virt_to_dma(dev, addr);
109 }
110 #endif
111 
112 /* The ARM override for dma_max_pfn() */
113 static inline unsigned long dma_max_pfn(struct device *dev)
114 {
115         return PHYS_PFN_OFFSET + dma_to_pfn(dev, *dev->dma_mask);
116 }
117 #define dma_max_pfn(dev) dma_max_pfn(dev)
118 
119 #define arch_setup_dma_ops arch_setup_dma_ops
120 extern void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
121                                struct iommu_ops *iommu, bool coherent);
122 
123 #define arch_teardown_dma_ops arch_teardown_dma_ops
124 extern void arch_teardown_dma_ops(struct device *dev);
125 
126 /* do not use this function in a driver */
127 static inline bool is_device_dma_coherent(struct device *dev)
128 {
129         return dev->archdata.dma_coherent;
130 }
131 
132 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
133 {
134         unsigned int offset = paddr & ~PAGE_MASK;
135         return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
136 }
137 
138 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
139 {
140         unsigned int offset = dev_addr & ~PAGE_MASK;
141         return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
142 }
143 
144 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
145 {
146         u64 limit, mask;
147 
148         if (!dev->dma_mask)
149                 return 0;
150 
151         mask = *dev->dma_mask;
152 
153         limit = (mask + 1) & ~mask;
154         if (limit && size > limit)
155                 return 0;
156 
157         if ((addr | (addr + size - 1)) & ~mask)
158                 return 0;
159 
160         return 1;
161 }
162 
163 static inline void dma_mark_clean(void *addr, size_t size) { }
164 
165 extern int arm_dma_set_mask(struct device *dev, u64 dma_mask);
166 
167 /**
168  * arm_dma_alloc - allocate consistent memory for DMA
169  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
170  * @size: required memory size
171  * @handle: bus-specific DMA address
172  * @attrs: optinal attributes that specific mapping properties
173  *
174  * Allocate some memory for a device for performing DMA.  This function
175  * allocates pages, and will return the CPU-viewed address, and sets @handle
176  * to be the device-viewed address.
177  */
178 extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
179                            gfp_t gfp, struct dma_attrs *attrs);
180 
181 /**
182  * arm_dma_free - free memory allocated by arm_dma_alloc
183  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
184  * @size: size of memory originally requested in dma_alloc_coherent
185  * @cpu_addr: CPU-view address returned from dma_alloc_coherent
186  * @handle: device-view address returned from dma_alloc_coherent
187  * @attrs: optinal attributes that specific mapping properties
188  *
189  * Free (and unmap) a DMA buffer previously allocated by
190  * arm_dma_alloc().
191  *
192  * References to memory and mappings associated with cpu_addr/handle
193  * during and after this call executing are illegal.
194  */
195 extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
196                          dma_addr_t handle, struct dma_attrs *attrs);
197 
198 /**
199  * arm_dma_mmap - map a coherent DMA allocation into user space
200  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
201  * @vma: vm_area_struct describing requested user mapping
202  * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
203  * @handle: device-view address returned from dma_alloc_coherent
204  * @size: size of memory originally requested in dma_alloc_coherent
205  * @attrs: optinal attributes that specific mapping properties
206  *
207  * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
208  * into user space.  The coherent DMA buffer must not be freed by the
209  * driver until the user space mapping has been released.
210  */
211 extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
212                         void *cpu_addr, dma_addr_t dma_addr, size_t size,
213                         struct dma_attrs *attrs);
214 
215 /*
216  * This can be called during early boot to increase the size of the atomic
217  * coherent DMA pool above the default value of 256KiB. It must be called
218  * before postcore_initcall.
219  */
220 extern void __init init_dma_coherent_pool_size(unsigned long size);
221 
222 /*
223  * For SA-1111, IXP425, and ADI systems  the dma-mapping functions are "magic"
224  * and utilize bounce buffers as needed to work around limited DMA windows.
225  *
226  * On the SA-1111, a bug limits DMA to only certain regions of RAM.
227  * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
228  * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
229  *
230  * The following are helper functions used by the dmabounce subystem
231  *
232  */
233 
234 /**
235  * dmabounce_register_dev
236  *
237  * @dev: valid struct device pointer
238  * @small_buf_size: size of buffers to use with small buffer pool
239  * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
240  * @needs_bounce_fn: called to determine whether buffer needs bouncing
241  *
242  * This function should be called by low-level platform code to register
243  * a device as requireing DMA buffer bouncing. The function will allocate
244  * appropriate DMA pools for the device.
245  */
246 extern int dmabounce_register_dev(struct device *, unsigned long,
247                 unsigned long, int (*)(struct device *, dma_addr_t, size_t));
248 
249 /**
250  * dmabounce_unregister_dev
251  *
252  * @dev: valid struct device pointer
253  *
254  * This function should be called by low-level platform code when device
255  * that was previously registered with dmabounce_register_dev is removed
256  * from the system.
257  *
258  */
259 extern void dmabounce_unregister_dev(struct device *);
260 
261 
262 
263 /*
264  * The scatter list versions of the above methods.
265  */
266 extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
267                 enum dma_data_direction, struct dma_attrs *attrs);
268 extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
269                 enum dma_data_direction, struct dma_attrs *attrs);
270 extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
271                 enum dma_data_direction);
272 extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
273                 enum dma_data_direction);
274 extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
275                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
276                 struct dma_attrs *attrs);
277 
278 #endif /* __KERNEL__ */
279 #endif
280 

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