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 extern struct dma_map_ops arm_coherent_dma_ops;
  17
  18 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  19 {
  20         if (dev && dev->archdata.dma_ops)
  21                 return dev->archdata.dma_ops;
  22         return &arm_dma_ops;
  23 }
  24
  25 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
  26 {
  27         BUG_ON(!dev);
  28         dev->archdata.dma_ops = ops;
  29 }
  30
  31 #include <asm-generic/dma-mapping-common.h>
  32
  33 static inline int dma_set_mask(struct device *dev, u64 mask)
  34 {
  35         return get_dma_ops(dev)->set_dma_mask(dev, mask);
  36 }
  37
  38 #ifdef __arch_page_to_dma
  39 #error Please update to __arch_pfn_to_dma
  40 #endif
  41
  42 /*
  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.
  46  */
  47 #ifndef __arch_pfn_to_dma
  48 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
  49 {
  50         return (dma_addr_t)__pfn_to_bus(pfn);
  51 }
  52
  53 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
  54 {
  55         return __bus_to_pfn(addr);
  56 }
  57
  58 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
  59 {
  60         return (void *)__bus_to_virt((unsigned long)addr);
  61 }
  62
  63 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
  64 {
  65         return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
  66 }
  67 #else
  68 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
  69 {
  70         return __arch_pfn_to_dma(dev, pfn);
  71 }
  72
  73 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
  74 {
  75         return __arch_dma_to_pfn(dev, addr);
  76 }
  77
  78 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
  79 {
  80         return __arch_dma_to_virt(dev, addr);
  81 }
  82
  83 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
  84 {
  85         return __arch_virt_to_dma(dev, addr);
  86 }
  87 #endif
  88
  89 /*
  90  * DMA errors are defined by all-bits-set in the DMA address.
  91  */
  92 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  93 {
  94         debug_dma_mapping_error(dev, dma_addr);
  95         return dma_addr == DMA_ERROR_CODE;
  96 }
  97
  98 /*
  99  * Dummy noncoherent implementation.  We don't provide a dma_cache_sync
 100  * function so drivers using this API are highlighted with build warnings.
 101  */
 102 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 103                 dma_addr_t *handle, gfp_t gfp)
 104 {
 105         return NULL;
 106 }
 107
 108 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 109                 void *cpu_addr, dma_addr_t handle)
 110 {
 111 }
 112
 113 extern int dma_supported(struct device *dev, u64 mask);
 114
 115 extern int arm_dma_set_mask(struct device *dev, u64 dma_mask);
 116
 117 /**
 118  * arm_dma_alloc - allocate consistent memory for DMA
 119  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 120  * @size: required memory size
 121  * @handle: bus-specific DMA address
 122  * @attrs: optinal attributes that specific mapping properties
 123  *
 124  * Allocate some memory for a device for performing DMA.  This function
 125  * allocates pages, and will return the CPU-viewed address, and sets @handle
 126  * to be the device-viewed address.
 127  */
 128 extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
 129                            gfp_t gfp, struct dma_attrs *attrs);
 130
 131 #define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
 132
 133 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 134                                        dma_addr_t *dma_handle, gfp_t flag,
 135                                        struct dma_attrs *attrs)
 136 {
 137         struct dma_map_ops *ops = get_dma_ops(dev);
 138         void *cpu_addr;
 139         BUG_ON(!ops);
 140
 141         cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
 142         debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 143         return cpu_addr;
 144 }
 145
 146 /**
 147  * arm_dma_free - free memory allocated by arm_dma_alloc
 148  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 149  * @size: size of memory originally requested in dma_alloc_coherent
 150  * @cpu_addr: CPU-view address returned from dma_alloc_coherent
 151  * @handle: device-view address returned from dma_alloc_coherent
 152  * @attrs: optinal attributes that specific mapping properties
 153  *
 154  * Free (and unmap) a DMA buffer previously allocated by
 155  * arm_dma_alloc().
 156  *
 157  * References to memory and mappings associated with cpu_addr/handle
 158  * during and after this call executing are illegal.
 159  */
 160 extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
 161                          dma_addr_t handle, struct dma_attrs *attrs);
 162
 163 #define dma_free_coherent(d, s, c, h) dma_free_attrs(d, s, c, h, NULL)
 164
 165 static inline void dma_free_attrs(struct device *dev, size_t size,
 166                                      void *cpu_addr, dma_addr_t dma_handle,
 167                                      struct dma_attrs *attrs)
 168 {
 169         struct dma_map_ops *ops = get_dma_ops(dev);
 170         BUG_ON(!ops);
 171
 172         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 173         ops->free(dev, size, cpu_addr, dma_handle, attrs);
 174 }
 175
 176 /**
 177  * arm_dma_mmap - map a coherent DMA allocation into user space
 178  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 179  * @vma: vm_area_struct describing requested user mapping
 180  * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
 181  * @handle: device-view address returned from dma_alloc_coherent
 182  * @size: size of memory originally requested in dma_alloc_coherent
 183  * @attrs: optinal attributes that specific mapping properties
 184  *
 185  * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
 186  * into user space.  The coherent DMA buffer must not be freed by the
 187  * driver until the user space mapping has been released.
 188  */
 189 extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
 190                         void *cpu_addr, dma_addr_t dma_addr, size_t size,
 191                         struct dma_attrs *attrs);
 192
 193 static inline void *dma_alloc_writecombine(struct device *dev, size_t size,
 194                                        dma_addr_t *dma_handle, gfp_t flag)
 195 {
 196         DEFINE_DMA_ATTRS(attrs);
 197         dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
 198         return dma_alloc_attrs(dev, size, dma_handle, flag, &attrs);
 199 }
 200
 201 static inline void dma_free_writecombine(struct device *dev, size_t size,
 202                                      void *cpu_addr, dma_addr_t dma_handle)
 203 {
 204         DEFINE_DMA_ATTRS(attrs);
 205         dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
 206         return dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
 207 }
 208
 209 /*
 210  * This can be called during early boot to increase the size of the atomic
 211  * coherent DMA pool above the default value of 256KiB. It must be called
 212  * before postcore_initcall.
 213  */
 214 extern void __init init_dma_coherent_pool_size(unsigned long size);
 215
 216 /*
 217  * For SA-1111, IXP425, and ADI systems  the dma-mapping functions are "magic"
 218  * and utilize bounce buffers as needed to work around limited DMA windows.
 219  *
 220  * On the SA-1111, a bug limits DMA to only certain regions of RAM.
 221  * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
 222  * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
 223  *
 224  * The following are helper functions used by the dmabounce subystem
 225  *
 226  */
 227
 228 /**
 229  * dmabounce_register_dev
 230  *
 231  * @dev: valid struct device pointer
 232  * @small_buf_size: size of buffers to use with small buffer pool
 233  * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
 234  * @needs_bounce_fn: called to determine whether buffer needs bouncing
 235  *
 236  * This function should be called by low-level platform code to register
 237  * a device as requireing DMA buffer bouncing. The function will allocate
 238  * appropriate DMA pools for the device.
 239  */
 240 extern int dmabounce_register_dev(struct device *, unsigned long,
 241                 unsigned long, int (*)(struct device *, dma_addr_t, size_t));
 242
 243 /**
 244  * dmabounce_unregister_dev
 245  *
 246  * @dev: valid struct device pointer
 247  *
 248  * This function should be called by low-level platform code when device
 249  * that was previously registered with dmabounce_register_dev is removed
 250  * from the system.
 251  *
 252  */
 253 extern void dmabounce_unregister_dev(struct device *);
 254
 255
 256
 257 /*
 258  * The scatter list versions of the above methods.
 259  */
 260 extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
 261                 enum dma_data_direction, struct dma_attrs *attrs);
 262 extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
 263                 enum dma_data_direction, struct dma_attrs *attrs);
 264 extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
 265                 enum dma_data_direction);
 266 extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
 267                 enum dma_data_direction);
 268 extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
 269                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 270                 struct dma_attrs *attrs);
 271
 272 #endif /* __KERNEL__ */
 273 #endif