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;
41 #define HAVE_ARCH_DMA_SUPPORTED 1
42 extern int dma_supported(struct device *dev, u64 mask);
44 #ifdef __arch_page_to_dma
45 #error Please update to __arch_pfn_to_dma
49 * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
50 * functions used internally by the DMA-mapping API to provide DMA
51 * addresses. They must not be used by drivers.
53 #ifndef __arch_pfn_to_dma
54 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
57 pfn -= dev->dma_pfn_offset;
58 return (dma_addr_t)__pfn_to_bus(pfn);
61 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
63 unsigned long pfn = __bus_to_pfn(addr);
66 pfn += dev->dma_pfn_offset;
71 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
74 unsigned long pfn = dma_to_pfn(dev, addr);
76 return phys_to_virt(__pfn_to_phys(pfn));
79 return (void *)__bus_to_virt((unsigned long)addr);
82 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
85 return pfn_to_dma(dev, virt_to_pfn(addr));
87 return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
91 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
93 return __arch_pfn_to_dma(dev, pfn);
96 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
98 return __arch_dma_to_pfn(dev, addr);
101 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
103 return __arch_dma_to_virt(dev, addr);
106 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
108 return __arch_virt_to_dma(dev, addr);
112 /* The ARM override for dma_max_pfn() */
113 static inline unsigned long dma_max_pfn(struct device *dev)
115 return PHYS_PFN_OFFSET + dma_to_pfn(dev, *dev->dma_mask);
117 #define dma_max_pfn(dev) dma_max_pfn(dev)
119 #define arch_setup_dma_ops arch_setup_dma_ops
120 extern void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
121 const struct iommu_ops *iommu, bool coherent);
123 #define arch_teardown_dma_ops arch_teardown_dma_ops
124 extern void arch_teardown_dma_ops(struct device *dev);
126 /* do not use this function in a driver */
127 static inline bool is_device_dma_coherent(struct device *dev)
129 return dev->archdata.dma_coherent;
132 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
134 unsigned int offset = paddr & ~PAGE_MASK;
135 return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
138 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
140 unsigned int offset = dev_addr & ~PAGE_MASK;
141 return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
144 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
151 mask = *dev->dma_mask;
153 limit = (mask + 1) & ~mask;
154 if (limit && size > limit)
157 if ((addr | (addr + size - 1)) & ~mask)
163 static inline void dma_mark_clean(void *addr, size_t size) { }
166 * arm_dma_alloc - allocate consistent memory for DMA
167 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
168 * @size: required memory size
169 * @handle: bus-specific DMA address
170 * @attrs: optinal attributes that specific mapping properties
172 * Allocate some memory for a device for performing DMA. This function
173 * allocates pages, and will return the CPU-viewed address, and sets @handle
174 * to be the device-viewed address.
176 extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
177 gfp_t gfp, struct dma_attrs *attrs);
180 * arm_dma_free - free memory allocated by arm_dma_alloc
181 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
182 * @size: size of memory originally requested in dma_alloc_coherent
183 * @cpu_addr: CPU-view address returned from dma_alloc_coherent
184 * @handle: device-view address returned from dma_alloc_coherent
185 * @attrs: optinal attributes that specific mapping properties
187 * Free (and unmap) a DMA buffer previously allocated by
190 * References to memory and mappings associated with cpu_addr/handle
191 * during and after this call executing are illegal.
193 extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
194 dma_addr_t handle, struct dma_attrs *attrs);
197 * arm_dma_mmap - map a coherent DMA allocation into user space
198 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
199 * @vma: vm_area_struct describing requested user mapping
200 * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
201 * @handle: device-view address returned from dma_alloc_coherent
202 * @size: size of memory originally requested in dma_alloc_coherent
203 * @attrs: optinal attributes that specific mapping properties
205 * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
206 * into user space. The coherent DMA buffer must not be freed by the
207 * driver until the user space mapping has been released.
209 extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
210 void *cpu_addr, dma_addr_t dma_addr, size_t size,
211 struct dma_attrs *attrs);
214 * This can be called during early boot to increase the size of the atomic
215 * coherent DMA pool above the default value of 256KiB. It must be called
216 * before postcore_initcall.
218 extern void __init init_dma_coherent_pool_size(unsigned long size);
221 * For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
222 * and utilize bounce buffers as needed to work around limited DMA windows.
224 * On the SA-1111, a bug limits DMA to only certain regions of RAM.
225 * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
226 * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
228 * The following are helper functions used by the dmabounce subystem
233 * dmabounce_register_dev
235 * @dev: valid struct device pointer
236 * @small_buf_size: size of buffers to use with small buffer pool
237 * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
238 * @needs_bounce_fn: called to determine whether buffer needs bouncing
240 * This function should be called by low-level platform code to register
241 * a device as requireing DMA buffer bouncing. The function will allocate
242 * appropriate DMA pools for the device.
244 extern int dmabounce_register_dev(struct device *, unsigned long,
245 unsigned long, int (*)(struct device *, dma_addr_t, size_t));
248 * dmabounce_unregister_dev
250 * @dev: valid struct device pointer
252 * This function should be called by low-level platform code when device
253 * that was previously registered with dmabounce_register_dev is removed
257 extern void dmabounce_unregister_dev(struct device *);
262 * The scatter list versions of the above methods.
264 extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
265 enum dma_data_direction, struct dma_attrs *attrs);
266 extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
267 enum dma_data_direction, struct dma_attrs *attrs);
268 extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
269 enum dma_data_direction);
270 extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
271 enum dma_data_direction);
272 extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
273 void *cpu_addr, dma_addr_t dma_addr, size_t size,
274 struct dma_attrs *attrs);
276 #endif /* __KERNEL__ */