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>
14 #define DMA_ERROR_CODE (~0)
15 extern struct dma_map_ops arm_dma_ops;
16 extern struct dma_map_ops arm_coherent_dma_ops;
18 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
20 if (dev && dev->archdata.dma_ops)
21 return dev->archdata.dma_ops;
25 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
28 dev->archdata.dma_ops = ops;
31 #include <asm-generic/dma-mapping-common.h>
33 static inline int dma_set_mask(struct device *dev, u64 mask)
35 return get_dma_ops(dev)->set_dma_mask(dev, mask);
38 #ifdef __arch_page_to_dma
39 #error Please update to __arch_pfn_to_dma
43 * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
44 * functions used internally by the DMA-mapping API to provide DMA
45 * addresses. They must not be used by drivers.
47 #ifndef __arch_pfn_to_dma
48 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
50 return (dma_addr_t)__pfn_to_bus(pfn);
53 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
55 return __bus_to_pfn(addr);
58 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
60 return (void *)__bus_to_virt((unsigned long)addr);
63 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
65 return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
68 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
70 return __arch_pfn_to_dma(dev, pfn);
73 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
75 return __arch_dma_to_pfn(dev, addr);
78 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
80 return __arch_dma_to_virt(dev, addr);
83 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
85 return __arch_virt_to_dma(dev, addr);
90 * DMA errors are defined by all-bits-set in the DMA address.
92 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
94 return dma_addr == DMA_ERROR_CODE;
98 * Dummy noncoherent implementation. We don't provide a dma_cache_sync
99 * function so drivers using this API are highlighted with build warnings.
101 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
102 dma_addr_t *handle, gfp_t gfp)
107 static inline void dma_free_noncoherent(struct device *dev, size_t size,
108 void *cpu_addr, dma_addr_t handle)
112 extern int dma_supported(struct device *dev, u64 mask);
114 extern int arm_dma_set_mask(struct device *dev, u64 dma_mask);
117 * arm_dma_alloc - allocate consistent memory for DMA
118 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
119 * @size: required memory size
120 * @handle: bus-specific DMA address
121 * @attrs: optinal attributes that specific mapping properties
123 * Allocate some memory for a device for performing DMA. This function
124 * allocates pages, and will return the CPU-viewed address, and sets @handle
125 * to be the device-viewed address.
127 extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
128 gfp_t gfp, struct dma_attrs *attrs);
130 #define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
132 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
133 dma_addr_t *dma_handle, gfp_t flag,
134 struct dma_attrs *attrs)
136 struct dma_map_ops *ops = get_dma_ops(dev);
140 cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
141 debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
146 * arm_dma_free - free memory allocated by arm_dma_alloc
147 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
148 * @size: size of memory originally requested in dma_alloc_coherent
149 * @cpu_addr: CPU-view address returned from dma_alloc_coherent
150 * @handle: device-view address returned from dma_alloc_coherent
151 * @attrs: optinal attributes that specific mapping properties
153 * Free (and unmap) a DMA buffer previously allocated by
156 * References to memory and mappings associated with cpu_addr/handle
157 * during and after this call executing are illegal.
159 extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
160 dma_addr_t handle, struct dma_attrs *attrs);
162 #define dma_free_coherent(d, s, c, h) dma_free_attrs(d, s, c, h, NULL)
164 static inline void dma_free_attrs(struct device *dev, size_t size,
165 void *cpu_addr, dma_addr_t dma_handle,
166 struct dma_attrs *attrs)
168 struct dma_map_ops *ops = get_dma_ops(dev);
171 debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
172 ops->free(dev, size, cpu_addr, dma_handle, attrs);
176 * arm_dma_mmap - map a coherent DMA allocation into user space
177 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
178 * @vma: vm_area_struct describing requested user mapping
179 * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
180 * @handle: device-view address returned from dma_alloc_coherent
181 * @size: size of memory originally requested in dma_alloc_coherent
182 * @attrs: optinal attributes that specific mapping properties
184 * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
185 * into user space. The coherent DMA buffer must not be freed by the
186 * driver until the user space mapping has been released.
188 extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
189 void *cpu_addr, dma_addr_t dma_addr, size_t size,
190 struct dma_attrs *attrs);
192 static inline void *dma_alloc_writecombine(struct device *dev, size_t size,
193 dma_addr_t *dma_handle, gfp_t flag)
195 DEFINE_DMA_ATTRS(attrs);
196 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
197 return dma_alloc_attrs(dev, size, dma_handle, flag, &attrs);
200 static inline void dma_free_writecombine(struct device *dev, size_t size,
201 void *cpu_addr, dma_addr_t dma_handle)
203 DEFINE_DMA_ATTRS(attrs);
204 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
205 return dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
209 * This can be called during early boot to increase the size of the atomic
210 * coherent DMA pool above the default value of 256KiB. It must be called
211 * before postcore_initcall.
213 extern void __init init_dma_coherent_pool_size(unsigned long size);
216 * For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
217 * and utilize bounce buffers as needed to work around limited DMA windows.
219 * On the SA-1111, a bug limits DMA to only certain regions of RAM.
220 * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
221 * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
223 * The following are helper functions used by the dmabounce subystem
228 * dmabounce_register_dev
230 * @dev: valid struct device pointer
231 * @small_buf_size: size of buffers to use with small buffer pool
232 * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
233 * @needs_bounce_fn: called to determine whether buffer needs bouncing
235 * This function should be called by low-level platform code to register
236 * a device as requireing DMA buffer bouncing. The function will allocate
237 * appropriate DMA pools for the device.
239 extern int dmabounce_register_dev(struct device *, unsigned long,
240 unsigned long, int (*)(struct device *, dma_addr_t, size_t));
243 * dmabounce_unregister_dev
245 * @dev: valid struct device pointer
247 * This function should be called by low-level platform code when device
248 * that was previously registered with dmabounce_register_dev is removed
252 extern void dmabounce_unregister_dev(struct device *);
257 * The scatter list versions of the above methods.
259 extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
260 enum dma_data_direction, struct dma_attrs *attrs);
261 extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
262 enum dma_data_direction, struct dma_attrs *attrs);
263 extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
264 enum dma_data_direction);
265 extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
266 enum dma_data_direction);
267 extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
268 void *cpu_addr, dma_addr_t dma_addr, size_t size,
269 struct dma_attrs *attrs);
271 #endif /* __KERNEL__ */