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/memory.h>
14 #include <asm/xen/hypervisor.h>
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;
20 static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
22 if (dev && dev->archdata.dma_ops)
23 return dev->archdata.dma_ops;
27 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
29 if (xen_initial_domain())
32 return __generic_dma_ops(dev);
35 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
38 dev->archdata.dma_ops = ops;
42 * Note that while the generic code provides dummy dma_{alloc,free}_noncoherent
43 * implementations, we don't provide a dma_cache_sync function so drivers using
44 * this API are highlighted with build warnings.
47 #include <asm-generic/dma-mapping-common.h>
49 static inline int dma_set_mask(struct device *dev, u64 mask)
51 return get_dma_ops(dev)->set_dma_mask(dev, mask);
54 #ifdef __arch_page_to_dma
55 #error Please update to __arch_pfn_to_dma
59 * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
60 * functions used internally by the DMA-mapping API to provide DMA
61 * addresses. They must not be used by drivers.
63 #ifndef __arch_pfn_to_dma
64 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
67 pfn -= dev->dma_pfn_offset;
68 return (dma_addr_t)__pfn_to_bus(pfn);
71 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
73 unsigned long pfn = __bus_to_pfn(addr);
76 pfn += dev->dma_pfn_offset;
81 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
84 unsigned long pfn = dma_to_pfn(dev, addr);
86 return phys_to_virt(__pfn_to_phys(pfn));
89 return (void *)__bus_to_virt((unsigned long)addr);
92 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
95 return pfn_to_dma(dev, virt_to_pfn(addr));
97 return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
101 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
103 return __arch_pfn_to_dma(dev, pfn);
106 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
108 return __arch_dma_to_pfn(dev, addr);
111 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
113 return __arch_dma_to_virt(dev, addr);
116 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
118 return __arch_virt_to_dma(dev, addr);
122 /* The ARM override for dma_max_pfn() */
123 static inline unsigned long dma_max_pfn(struct device *dev)
125 return PHYS_PFN_OFFSET + dma_to_pfn(dev, *dev->dma_mask);
127 #define dma_max_pfn(dev) dma_max_pfn(dev)
129 #define arch_setup_dma_ops arch_setup_dma_ops
130 extern void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
131 struct iommu_ops *iommu, bool coherent);
133 #define arch_teardown_dma_ops arch_teardown_dma_ops
134 extern void arch_teardown_dma_ops(struct device *dev);
136 /* do not use this function in a driver */
137 static inline bool is_device_dma_coherent(struct device *dev)
139 return dev->archdata.dma_coherent;
142 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
144 unsigned int offset = paddr & ~PAGE_MASK;
145 return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
148 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
150 unsigned int offset = dev_addr & ~PAGE_MASK;
151 return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
154 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
161 mask = *dev->dma_mask;
163 limit = (mask + 1) & ~mask;
164 if (limit && size > limit)
167 if ((addr | (addr + size - 1)) & ~mask)
173 static inline void dma_mark_clean(void *addr, size_t size) { }
176 * DMA errors are defined by all-bits-set in the DMA address.
178 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
180 debug_dma_mapping_error(dev, dma_addr);
181 return dma_addr == DMA_ERROR_CODE;
184 extern int dma_supported(struct device *dev, u64 mask);
186 extern int arm_dma_set_mask(struct device *dev, u64 dma_mask);
189 * arm_dma_alloc - allocate consistent memory for DMA
190 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
191 * @size: required memory size
192 * @handle: bus-specific DMA address
193 * @attrs: optinal attributes that specific mapping properties
195 * Allocate some memory for a device for performing DMA. This function
196 * allocates pages, and will return the CPU-viewed address, and sets @handle
197 * to be the device-viewed address.
199 extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
200 gfp_t gfp, struct dma_attrs *attrs);
203 * arm_dma_free - free memory allocated by arm_dma_alloc
204 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
205 * @size: size of memory originally requested in dma_alloc_coherent
206 * @cpu_addr: CPU-view address returned from dma_alloc_coherent
207 * @handle: device-view address returned from dma_alloc_coherent
208 * @attrs: optinal attributes that specific mapping properties
210 * Free (and unmap) a DMA buffer previously allocated by
213 * References to memory and mappings associated with cpu_addr/handle
214 * during and after this call executing are illegal.
216 extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
217 dma_addr_t handle, struct dma_attrs *attrs);
220 * arm_dma_mmap - map a coherent DMA allocation into user space
221 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
222 * @vma: vm_area_struct describing requested user mapping
223 * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
224 * @handle: device-view address returned from dma_alloc_coherent
225 * @size: size of memory originally requested in dma_alloc_coherent
226 * @attrs: optinal attributes that specific mapping properties
228 * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
229 * into user space. The coherent DMA buffer must not be freed by the
230 * driver until the user space mapping has been released.
232 extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
233 void *cpu_addr, dma_addr_t dma_addr, size_t size,
234 struct dma_attrs *attrs);
237 * This can be called during early boot to increase the size of the atomic
238 * coherent DMA pool above the default value of 256KiB. It must be called
239 * before postcore_initcall.
241 extern void __init init_dma_coherent_pool_size(unsigned long size);
244 * For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
245 * and utilize bounce buffers as needed to work around limited DMA windows.
247 * On the SA-1111, a bug limits DMA to only certain regions of RAM.
248 * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
249 * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
251 * The following are helper functions used by the dmabounce subystem
256 * dmabounce_register_dev
258 * @dev: valid struct device pointer
259 * @small_buf_size: size of buffers to use with small buffer pool
260 * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
261 * @needs_bounce_fn: called to determine whether buffer needs bouncing
263 * This function should be called by low-level platform code to register
264 * a device as requireing DMA buffer bouncing. The function will allocate
265 * appropriate DMA pools for the device.
267 extern int dmabounce_register_dev(struct device *, unsigned long,
268 unsigned long, int (*)(struct device *, dma_addr_t, size_t));
271 * dmabounce_unregister_dev
273 * @dev: valid struct device pointer
275 * This function should be called by low-level platform code when device
276 * that was previously registered with dmabounce_register_dev is removed
280 extern void dmabounce_unregister_dev(struct device *);
285 * The scatter list versions of the above methods.
287 extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
288 enum dma_data_direction, struct dma_attrs *attrs);
289 extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
290 enum dma_data_direction, struct dma_attrs *attrs);
291 extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
292 enum dma_data_direction);
293 extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
294 enum dma_data_direction);
295 extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
296 void *cpu_addr, dma_addr_t dma_addr, size_t size,
297 struct dma_attrs *attrs);
299 #endif /* __KERNEL__ */