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/memory.h>
13 #include <asm/xen/hypervisor.h>
15 #define DMA_ERROR_CODE (~(dma_addr_t)0x0)
16 extern const struct dma_map_ops arm_dma_ops;
17 extern const struct dma_map_ops arm_coherent_dma_ops;
19 static inline const struct dma_map_ops *__generic_dma_ops(struct device *dev)
21 if (dev && dev->dma_ops)
26 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
28 if (xen_initial_domain())
31 return __generic_dma_ops(NULL);
34 #define HAVE_ARCH_DMA_SUPPORTED 1
35 extern int dma_supported(struct device *dev, u64 mask);
37 #ifdef __arch_page_to_dma
38 #error Please update to __arch_pfn_to_dma
42 * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
43 * functions used internally by the DMA-mapping API to provide DMA
44 * addresses. They must not be used by drivers.
46 #ifndef __arch_pfn_to_dma
47 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
50 pfn -= dev->dma_pfn_offset;
51 return (dma_addr_t)__pfn_to_bus(pfn);
54 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
56 unsigned long pfn = __bus_to_pfn(addr);
59 pfn += dev->dma_pfn_offset;
64 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
67 unsigned long pfn = dma_to_pfn(dev, addr);
69 return phys_to_virt(__pfn_to_phys(pfn));
72 return (void *)__bus_to_virt((unsigned long)addr);
75 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
78 return pfn_to_dma(dev, virt_to_pfn(addr));
80 return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
84 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
86 return __arch_pfn_to_dma(dev, pfn);
89 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
91 return __arch_dma_to_pfn(dev, addr);
94 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
96 return __arch_dma_to_virt(dev, addr);
99 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
101 return __arch_virt_to_dma(dev, addr);
105 /* The ARM override for dma_max_pfn() */
106 static inline unsigned long dma_max_pfn(struct device *dev)
108 return dma_to_pfn(dev, *dev->dma_mask);
110 #define dma_max_pfn(dev) dma_max_pfn(dev)
112 #define arch_setup_dma_ops arch_setup_dma_ops
113 extern void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
114 const struct iommu_ops *iommu, bool coherent);
116 #define arch_teardown_dma_ops arch_teardown_dma_ops
117 extern void arch_teardown_dma_ops(struct device *dev);
119 /* do not use this function in a driver */
120 static inline bool is_device_dma_coherent(struct device *dev)
122 return dev->archdata.dma_coherent;
125 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
127 unsigned int offset = paddr & ~PAGE_MASK;
128 return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
131 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
133 unsigned int offset = dev_addr & ~PAGE_MASK;
134 return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
137 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
144 mask = *dev->dma_mask;
146 limit = (mask + 1) & ~mask;
147 if (limit && size > limit)
150 if ((addr | (addr + size - 1)) & ~mask)
156 static inline void dma_mark_clean(void *addr, size_t size) { }
159 * arm_dma_alloc - allocate consistent memory for DMA
160 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
161 * @size: required memory size
162 * @handle: bus-specific DMA address
163 * @attrs: optinal attributes that specific mapping properties
165 * Allocate some memory for a device for performing DMA. This function
166 * allocates pages, and will return the CPU-viewed address, and sets @handle
167 * to be the device-viewed address.
169 extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
170 gfp_t gfp, unsigned long attrs);
173 * arm_dma_free - free memory allocated by arm_dma_alloc
174 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
175 * @size: size of memory originally requested in dma_alloc_coherent
176 * @cpu_addr: CPU-view address returned from dma_alloc_coherent
177 * @handle: device-view address returned from dma_alloc_coherent
178 * @attrs: optinal attributes that specific mapping properties
180 * Free (and unmap) a DMA buffer previously allocated by
183 * References to memory and mappings associated with cpu_addr/handle
184 * during and after this call executing are illegal.
186 extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
187 dma_addr_t handle, unsigned long attrs);
190 * arm_dma_mmap - map a coherent DMA allocation into user space
191 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
192 * @vma: vm_area_struct describing requested user mapping
193 * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
194 * @handle: device-view address returned from dma_alloc_coherent
195 * @size: size of memory originally requested in dma_alloc_coherent
196 * @attrs: optinal attributes that specific mapping properties
198 * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
199 * into user space. The coherent DMA buffer must not be freed by the
200 * driver until the user space mapping has been released.
202 extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
203 void *cpu_addr, dma_addr_t dma_addr, size_t size,
204 unsigned long attrs);
207 * This can be called during early boot to increase the size of the atomic
208 * coherent DMA pool above the default value of 256KiB. It must be called
209 * before postcore_initcall.
211 extern void __init init_dma_coherent_pool_size(unsigned long size);
214 * For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
215 * and utilize bounce buffers as needed to work around limited DMA windows.
217 * On the SA-1111, a bug limits DMA to only certain regions of RAM.
218 * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
219 * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
221 * The following are helper functions used by the dmabounce subystem
226 * dmabounce_register_dev
228 * @dev: valid struct device pointer
229 * @small_buf_size: size of buffers to use with small buffer pool
230 * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
231 * @needs_bounce_fn: called to determine whether buffer needs bouncing
233 * This function should be called by low-level platform code to register
234 * a device as requireing DMA buffer bouncing. The function will allocate
235 * appropriate DMA pools for the device.
237 extern int dmabounce_register_dev(struct device *, unsigned long,
238 unsigned long, int (*)(struct device *, dma_addr_t, size_t));
241 * dmabounce_unregister_dev
243 * @dev: valid struct device pointer
245 * This function should be called by low-level platform code when device
246 * that was previously registered with dmabounce_register_dev is removed
250 extern void dmabounce_unregister_dev(struct device *);
255 * The scatter list versions of the above methods.
257 extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
258 enum dma_data_direction, unsigned long attrs);
259 extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
260 enum dma_data_direction, unsigned long attrs);
261 extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
262 enum dma_data_direction);
263 extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
264 enum dma_data_direction);
265 extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
266 void *cpu_addr, dma_addr_t dma_addr, size_t size,
267 unsigned long attrs);
269 #endif /* __KERNEL__ */