arch/arm/include/asm/dma-mapping.h

   1 #ifndef ASMARM_DMA_MAPPING_H
   2 #define ASMARM_DMA_MAPPING_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/mm_types.h>
   7 #include <linux/scatterlist.h>
   8 #include <linux/dma-attrs.h>
   9 #include <linux/dma-debug.h>
  10
  11 #include <asm-generic/dma-coherent.h>
  12 #include <asm/memory.h>
  13
  14 #define DMA_ERROR_CODE  (~0)
  15 extern struct dma_map_ops arm_dma_ops;
  16
  17 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  18 {
  19         if (dev && dev->archdata.dma_ops)
  20                 return dev->archdata.dma_ops;
  21         return &arm_dma_ops;
  22 }
  23
  24 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
  25 {
  26         BUG_ON(!dev);
  27         dev->archdata.dma_ops = ops;
  28 }
  29
  30 #include <asm-generic/dma-mapping-common.h>
  31
  32 static inline int dma_set_mask(struct device *dev, u64 mask)
  33 {
  34         return get_dma_ops(dev)->set_dma_mask(dev, mask);
  35 }
  36
  37 #ifdef __arch_page_to_dma
  38 #error Please update to __arch_pfn_to_dma
  39 #endif
  40
  41 /*
  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.
  45  */
  46 #ifndef __arch_pfn_to_dma
  47 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
  48 {
  49         return (dma_addr_t)__pfn_to_bus(pfn);
  50 }
  51
  52 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
  53 {
  54         return __bus_to_pfn(addr);
  55 }
  56
  57 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
  58 {
  59         return (void *)__bus_to_virt((unsigned long)addr);
  60 }
  61
  62 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
  63 {
  64         return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
  65 }
  66 #else
  67 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
  68 {
  69         return __arch_pfn_to_dma(dev, pfn);
  70 }
  71
  72 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
  73 {
  74         return __arch_dma_to_pfn(dev, addr);
  75 }
  76
  77 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
  78 {
  79         return __arch_dma_to_virt(dev, addr);
  80 }
  81
  82 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
  83 {
  84         return __arch_virt_to_dma(dev, addr);
  85 }
  86 #endif
  87
  88 /*
  89  * DMA errors are defined by all-bits-set in the DMA address.
  90  */
  91 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  92 {
  93         return dma_addr == DMA_ERROR_CODE;
  94 }
  95
  96 /*
  97  * Dummy noncoherent implementation.  We don't provide a dma_cache_sync
  98  * function so drivers using this API are highlighted with build warnings.
  99  */
 100 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 101                 dma_addr_t *handle, gfp_t gfp)
 102 {
 103         return NULL;
 104 }
 105
 106 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 107                 void *cpu_addr, dma_addr_t handle)
 108 {
 109 }
 110
 111 extern int dma_supported(struct device *dev, u64 mask);
 112
 113 /**
 114  * arm_dma_alloc - allocate consistent memory for DMA
 115  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 116  * @size: required memory size
 117  * @handle: bus-specific DMA address
 118  * @attrs: optinal attributes that specific mapping properties
 119  *
 120  * Allocate some memory for a device for performing DMA.  This function
 121  * allocates pages, and will return the CPU-viewed address, and sets @handle
 122  * to be the device-viewed address.
 123  */
 124 extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
 125                            gfp_t gfp, struct dma_attrs *attrs);
 126
 127 #define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
 128
 129 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 130                                        dma_addr_t *dma_handle, gfp_t flag,
 131                                        struct dma_attrs *attrs)
 132 {
 133         struct dma_map_ops *ops = get_dma_ops(dev);
 134         void *cpu_addr;
 135         BUG_ON(!ops);
 136
 137         cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
 138         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 139         return cpu_addr;
 140 }
 141
 142 /**
 143  * arm_dma_free - free memory allocated by arm_dma_alloc
 144  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 145  * @size: size of memory originally requested in dma_alloc_coherent
 146  * @cpu_addr: CPU-view address returned from dma_alloc_coherent
 147  * @handle: device-view address returned from dma_alloc_coherent
 148  * @attrs: optinal attributes that specific mapping properties
 149  *
 150  * Free (and unmap) a DMA buffer previously allocated by
 151  * arm_dma_alloc().
 152  *
 153  * References to memory and mappings associated with cpu_addr/handle
 154  * during and after this call executing are illegal.
 155  */
 156 extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
 157                          dma_addr_t handle, struct dma_attrs *attrs);
 158
 159 #define dma_free_coherent(d, s, c, h) dma_free_attrs(d, s, c, h, NULL)
 160
 161 static inline void dma_free_attrs(struct device *dev, size_t size,
 162                                      void *cpu_addr, dma_addr_t dma_handle,
 163                                      struct dma_attrs *attrs)
 164 {
 165         struct dma_map_ops *ops = get_dma_ops(dev);
 166         BUG_ON(!ops);
 167
 168         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 169         ops->free(dev, size, cpu_addr, dma_handle, attrs);
 170 }
 171
 172 /**
 173  * arm_dma_mmap - map a coherent DMA allocation into user space
 174  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 175  * @vma: vm_area_struct describing requested user mapping
 176  * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
 177  * @handle: device-view address returned from dma_alloc_coherent
 178  * @size: size of memory originally requested in dma_alloc_coherent
 179  * @attrs: optinal attributes that specific mapping properties
 180  *
 181  * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
 182  * into user space.  The coherent DMA buffer must not be freed by the
 183  * driver until the user space mapping has been released.
 184  */
 185 extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
 186                         void *cpu_addr, dma_addr_t dma_addr, size_t size,
 187                         struct dma_attrs *attrs);
 188
 189 static inline void *dma_alloc_writecombine(struct device *dev, size_t size,
 190                                        dma_addr_t *dma_handle, gfp_t flag)
 191 {
 192         DEFINE_DMA_ATTRS(attrs);
 193         dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
 194         return dma_alloc_attrs(dev, size, dma_handle, flag, &attrs);
 195 }
 196
 197 static inline void dma_free_writecombine(struct device *dev, size_t size,
 198                                      void *cpu_addr, dma_addr_t dma_handle)
 199 {
 200         DEFINE_DMA_ATTRS(attrs);
 201         dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
 202         return dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
 203 }
 204
 205 /*
 206  * This can be called during boot to increase the size of the consistent
 207  * DMA region above it's default value of 2MB. It must be called before the
 208  * memory allocator is initialised, i.e. before any core_initcall.
 209  */
 210 static inline void init_consistent_dma_size(unsigned long size) { }
 211
 212 /*
 213  * For SA-1111, IXP425, and ADI systems  the dma-mapping functions are "magic"
 214  * and utilize bounce buffers as needed to work around limited DMA windows.
 215  *
 216  * On the SA-1111, a bug limits DMA to only certain regions of RAM.
 217  * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
 218  * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
 219  *
 220  * The following are helper functions used by the dmabounce subystem
 221  *
 222  */
 223
 224 /**
 225  * dmabounce_register_dev
 226  *
 227  * @dev: valid struct device pointer
 228  * @small_buf_size: size of buffers to use with small buffer pool
 229  * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
 230  * @needs_bounce_fn: called to determine whether buffer needs bouncing
 231  *
 232  * This function should be called by low-level platform code to register
 233  * a device as requireing DMA buffer bouncing. The function will allocate
 234  * appropriate DMA pools for the device.
 235  */
 236 extern int dmabounce_register_dev(struct device *, unsigned long,
 237                 unsigned long, int (*)(struct device *, dma_addr_t, size_t));
 238
 239 /**
 240  * dmabounce_unregister_dev
 241  *
 242  * @dev: valid struct device pointer
 243  *
 244  * This function should be called by low-level platform code when device
 245  * that was previously registered with dmabounce_register_dev is removed
 246  * from the system.
 247  *
 248  */
 249 extern void dmabounce_unregister_dev(struct device *);
 250
 251
 252
 253 /*
 254  * The scatter list versions of the above methods.
 255  */
 256 extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
 257                 enum dma_data_direction, struct dma_attrs *attrs);
 258 extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
 259                 enum dma_data_direction, struct dma_attrs *attrs);
 260 extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
 261                 enum dma_data_direction);
 262 extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
 263                 enum dma_data_direction);
 264 extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
 265                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 266                 struct dma_attrs *attrs);
 267
 268 #endif /* __KERNEL__ */
 269 #endif