1 #ifndef ASMARM_DMA_MAPPING_H
2 #define ASMARM_DMA_MAPPING_H
6 #include <linux/mm_types.h>
7 #include <linux/scatterlist.h>
8 #include <linux/dma-attrs.h>
9 #include <linux/dma-debug.h>
11 #include <asm-generic/dma-coherent.h>
12 #include <asm/memory.h>
15 #include <asm/xen/hypervisor.h>
17 #define DMA_ERROR_CODE (~0)
18 extern struct dma_map_ops arm_dma_ops;
19 extern struct dma_map_ops arm_coherent_dma_ops;
21 static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
23 if (dev && dev->archdata.dma_ops)
24 return dev->archdata.dma_ops;
28 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
30 if (xen_initial_domain())
33 return __generic_dma_ops(dev);
36 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
39 dev->archdata.dma_ops = ops;
42 #include <asm-generic/dma-mapping-common.h>
44 static inline int dma_set_mask(struct device *dev, u64 mask)
46 return get_dma_ops(dev)->set_dma_mask(dev, mask);
49 #ifdef __arch_page_to_dma
50 #error Please update to __arch_pfn_to_dma
54 * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
55 * functions used internally by the DMA-mapping API to provide DMA
56 * addresses. They must not be used by drivers.
58 #ifndef __arch_pfn_to_dma
59 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
61 return (dma_addr_t)__pfn_to_bus(pfn);
64 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
66 return __bus_to_pfn(addr);
69 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
71 return (void *)__bus_to_virt((unsigned long)addr);
74 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
76 return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
80 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
82 return __arch_pfn_to_dma(dev, pfn);
85 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
87 return __arch_dma_to_pfn(dev, addr);
90 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
92 return __arch_dma_to_virt(dev, addr);
95 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
97 return __arch_virt_to_dma(dev, addr);
101 /* The ARM override for dma_max_pfn() */
102 static inline unsigned long dma_max_pfn(struct device *dev)
104 return PHYS_PFN_OFFSET + dma_to_pfn(dev, *dev->dma_mask);
106 #define dma_max_pfn(dev) dma_max_pfn(dev)
108 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
110 unsigned int offset = paddr & ~PAGE_MASK;
111 return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
114 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
116 unsigned int offset = dev_addr & ~PAGE_MASK;
117 return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
120 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
127 mask = *dev->dma_mask;
129 limit = (mask + 1) & ~mask;
130 if (limit && size > limit)
133 if ((addr | (addr + size - 1)) & ~mask)
139 static inline void dma_mark_clean(void *addr, size_t size) { }
142 * DMA errors are defined by all-bits-set in the DMA address.
144 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
146 debug_dma_mapping_error(dev, dma_addr);
147 return dma_addr == DMA_ERROR_CODE;
151 * Dummy noncoherent implementation. We don't provide a dma_cache_sync
152 * function so drivers using this API are highlighted with build warnings.
154 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
155 dma_addr_t *handle, gfp_t gfp)
160 static inline void dma_free_noncoherent(struct device *dev, size_t size,
161 void *cpu_addr, dma_addr_t handle)
165 extern int dma_supported(struct device *dev, u64 mask);
167 extern int arm_dma_set_mask(struct device *dev, u64 dma_mask);
170 * arm_dma_alloc - allocate consistent memory for DMA
171 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
172 * @size: required memory size
173 * @handle: bus-specific DMA address
174 * @attrs: optinal attributes that specific mapping properties
176 * Allocate some memory for a device for performing DMA. This function
177 * allocates pages, and will return the CPU-viewed address, and sets @handle
178 * to be the device-viewed address.
180 extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
181 gfp_t gfp, struct dma_attrs *attrs);
183 #define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
185 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
186 dma_addr_t *dma_handle, gfp_t flag,
187 struct dma_attrs *attrs)
189 struct dma_map_ops *ops = get_dma_ops(dev);
193 cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
194 debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
199 * arm_dma_free - free memory allocated by arm_dma_alloc
200 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
201 * @size: size of memory originally requested in dma_alloc_coherent
202 * @cpu_addr: CPU-view address returned from dma_alloc_coherent
203 * @handle: device-view address returned from dma_alloc_coherent
204 * @attrs: optinal attributes that specific mapping properties
206 * Free (and unmap) a DMA buffer previously allocated by
209 * References to memory and mappings associated with cpu_addr/handle
210 * during and after this call executing are illegal.
212 extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
213 dma_addr_t handle, struct dma_attrs *attrs);
215 #define dma_free_coherent(d, s, c, h) dma_free_attrs(d, s, c, h, NULL)
217 static inline void dma_free_attrs(struct device *dev, size_t size,
218 void *cpu_addr, dma_addr_t dma_handle,
219 struct dma_attrs *attrs)
221 struct dma_map_ops *ops = get_dma_ops(dev);
224 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
225 ops->free(dev, size, cpu_addr, dma_handle, attrs);
229 * arm_dma_mmap - map a coherent DMA allocation into user space
230 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
231 * @vma: vm_area_struct describing requested user mapping
232 * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
233 * @handle: device-view address returned from dma_alloc_coherent
234 * @size: size of memory originally requested in dma_alloc_coherent
235 * @attrs: optinal attributes that specific mapping properties
237 * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
238 * into user space. The coherent DMA buffer must not be freed by the
239 * driver until the user space mapping has been released.
241 extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
242 void *cpu_addr, dma_addr_t dma_addr, size_t size,
243 struct dma_attrs *attrs);
245 static inline void *dma_alloc_writecombine(struct device *dev, size_t size,
246 dma_addr_t *dma_handle, gfp_t flag)
248 DEFINE_DMA_ATTRS(attrs);
249 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
250 return dma_alloc_attrs(dev, size, dma_handle, flag, &attrs);
253 static inline void dma_free_writecombine(struct device *dev, size_t size,
254 void *cpu_addr, dma_addr_t dma_handle)
256 DEFINE_DMA_ATTRS(attrs);
257 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
258 return dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
262 * This can be called during early boot to increase the size of the atomic
263 * coherent DMA pool above the default value of 256KiB. It must be called
264 * before postcore_initcall.
266 extern void __init init_dma_coherent_pool_size(unsigned long size);
269 * For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
270 * and utilize bounce buffers as needed to work around limited DMA windows.
272 * On the SA-1111, a bug limits DMA to only certain regions of RAM.
273 * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
274 * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
276 * The following are helper functions used by the dmabounce subystem
281 * dmabounce_register_dev
283 * @dev: valid struct device pointer
284 * @small_buf_size: size of buffers to use with small buffer pool
285 * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
286 * @needs_bounce_fn: called to determine whether buffer needs bouncing
288 * This function should be called by low-level platform code to register
289 * a device as requireing DMA buffer bouncing. The function will allocate
290 * appropriate DMA pools for the device.
292 extern int dmabounce_register_dev(struct device *, unsigned long,
293 unsigned long, int (*)(struct device *, dma_addr_t, size_t));
296 * dmabounce_unregister_dev
298 * @dev: valid struct device pointer
300 * This function should be called by low-level platform code when device
301 * that was previously registered with dmabounce_register_dev is removed
305 extern void dmabounce_unregister_dev(struct device *);
310 * The scatter list versions of the above methods.
312 extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
313 enum dma_data_direction, struct dma_attrs *attrs);
314 extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
315 enum dma_data_direction, struct dma_attrs *attrs);
316 extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
317 enum dma_data_direction);
318 extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
319 enum dma_data_direction);
320 extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
321 void *cpu_addr, dma_addr_t dma_addr, size_t size,
322 struct dma_attrs *attrs);
324 #endif /* __KERNEL__ */