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-debug.h>
10 #include <asm-generic/dma-coherent.h>
11 #include <asm/memory.h>
13 #define DMA_ERROR_CODE (~0)
14 extern struct dma_map_ops arm_dma_ops;
16 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
18 if (dev && dev->archdata.dma_ops)
19 return dev->archdata.dma_ops;
23 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
26 dev->archdata.dma_ops = ops;
29 #include <asm-generic/dma-mapping-common.h>
31 static inline int dma_set_mask(struct device *dev, u64 mask)
33 return get_dma_ops(dev)->set_dma_mask(dev, mask);
36 #ifdef __arch_page_to_dma
37 #error Please update to __arch_pfn_to_dma
41 * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
42 * functions used internally by the DMA-mapping API to provide DMA
43 * addresses. They must not be used by drivers.
45 #ifndef __arch_pfn_to_dma
46 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
48 return (dma_addr_t)__pfn_to_bus(pfn);
51 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
53 return __bus_to_pfn(addr);
56 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
58 return (void *)__bus_to_virt((unsigned long)addr);
61 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
63 return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
66 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
68 return __arch_pfn_to_dma(dev, pfn);
71 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
73 return __arch_dma_to_pfn(dev, addr);
76 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
78 return __arch_dma_to_virt(dev, addr);
81 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
83 return __arch_virt_to_dma(dev, addr);
88 * DMA errors are defined by all-bits-set in the DMA address.
90 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
92 return dma_addr == DMA_ERROR_CODE;
96 * Dummy noncoherent implementation. We don't provide a dma_cache_sync
97 * function so drivers using this API are highlighted with build warnings.
99 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
100 dma_addr_t *handle, gfp_t gfp)
105 static inline void dma_free_noncoherent(struct device *dev, size_t size,
106 void *cpu_addr, dma_addr_t handle)
110 extern int dma_supported(struct device *dev, u64 mask);
113 * dma_alloc_coherent - allocate consistent memory for DMA
114 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
115 * @size: required memory size
116 * @handle: bus-specific DMA address
118 * Allocate some uncached, unbuffered memory for a device for
119 * performing DMA. This function allocates pages, and will
120 * return the CPU-viewed address, and sets @handle to be the
121 * device-viewed address.
123 extern void *dma_alloc_coherent(struct device *, size_t, dma_addr_t *, gfp_t);
126 * dma_free_coherent - free memory allocated by dma_alloc_coherent
127 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
128 * @size: size of memory originally requested in dma_alloc_coherent
129 * @cpu_addr: CPU-view address returned from dma_alloc_coherent
130 * @handle: device-view address returned from dma_alloc_coherent
132 * Free (and unmap) a DMA buffer previously allocated by
133 * dma_alloc_coherent().
135 * References to memory and mappings associated with cpu_addr/handle
136 * during and after this call executing are illegal.
138 extern void dma_free_coherent(struct device *, size_t, void *, dma_addr_t);
141 * dma_mmap_coherent - map a coherent DMA allocation into user space
142 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
143 * @vma: vm_area_struct describing requested user mapping
144 * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
145 * @handle: device-view address returned from dma_alloc_coherent
146 * @size: size of memory originally requested in dma_alloc_coherent
148 * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
149 * into user space. The coherent DMA buffer must not be freed by the
150 * driver until the user space mapping has been released.
152 int dma_mmap_coherent(struct device *, struct vm_area_struct *,
153 void *, dma_addr_t, size_t);
157 * dma_alloc_writecombine - allocate writecombining memory for DMA
158 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
159 * @size: required memory size
160 * @handle: bus-specific DMA address
162 * Allocate some uncached, buffered memory for a device for
163 * performing DMA. This function allocates pages, and will
164 * return the CPU-viewed address, and sets @handle to be the
165 * device-viewed address.
167 extern void *dma_alloc_writecombine(struct device *, size_t, dma_addr_t *,
170 #define dma_free_writecombine(dev,size,cpu_addr,handle) \
171 dma_free_coherent(dev,size,cpu_addr,handle)
173 int dma_mmap_writecombine(struct device *, struct vm_area_struct *,
174 void *, dma_addr_t, size_t);
177 * This can be called during boot to increase the size of the consistent
178 * DMA region above it's default value of 2MB. It must be called before the
179 * memory allocator is initialised, i.e. before any core_initcall.
181 extern void __init init_consistent_dma_size(unsigned long size);
185 * For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
186 * and utilize bounce buffers as needed to work around limited DMA windows.
188 * On the SA-1111, a bug limits DMA to only certain regions of RAM.
189 * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
190 * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
192 * The following are helper functions used by the dmabounce subystem
197 * dmabounce_register_dev
199 * @dev: valid struct device pointer
200 * @small_buf_size: size of buffers to use with small buffer pool
201 * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
202 * @needs_bounce_fn: called to determine whether buffer needs bouncing
204 * This function should be called by low-level platform code to register
205 * a device as requireing DMA buffer bouncing. The function will allocate
206 * appropriate DMA pools for the device.
208 extern int dmabounce_register_dev(struct device *, unsigned long,
209 unsigned long, int (*)(struct device *, dma_addr_t, size_t));
212 * dmabounce_unregister_dev
214 * @dev: valid struct device pointer
216 * This function should be called by low-level platform code when device
217 * that was previously registered with dmabounce_register_dev is removed
221 extern void dmabounce_unregister_dev(struct device *);
226 * The scatter list versions of the above methods.
228 extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
229 enum dma_data_direction, struct dma_attrs *attrs);
230 extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
231 enum dma_data_direction, struct dma_attrs *attrs);
232 extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
233 enum dma_data_direction);
234 extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
235 enum dma_data_direction);
237 #endif /* __KERNEL__ */