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/memory.h>
  12
  13 #include <xen/xen.h>
  14 #include <asm/xen/hypervisor.h>
  15
  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;
  19
  20 static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
  21 {
  22         if (dev && dev->archdata.dma_ops)
  23                 return dev->archdata.dma_ops;
  24         return &arm_dma_ops;
  25 }
  26
  27 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  28 {
  29         if (xen_initial_domain())
  30                 return xen_dma_ops;
  31         else
  32                 return __generic_dma_ops(dev);
  33 }
  34
  35 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
  36 {
  37         BUG_ON(!dev);
  38         dev->archdata.dma_ops = ops;
  39 }
  40
  41 #define HAVE_ARCH_DMA_SUPPORTED 1
  42 extern int dma_supported(struct device *dev, u64 mask);
  43
  44 #ifdef __arch_page_to_dma
  45 #error Please update to __arch_pfn_to_dma
  46 #endif
  47
  48 /*
  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.
  52  */
  53 #ifndef __arch_pfn_to_dma
  54 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
  55 {
  56         if (dev)
  57                 pfn -= dev->dma_pfn_offset;
  58         return (dma_addr_t)__pfn_to_bus(pfn);
  59 }
  60
  61 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
  62 {
  63         unsigned long pfn = __bus_to_pfn(addr);
  64
  65         if (dev)
  66                 pfn += dev->dma_pfn_offset;
  67
  68         return pfn;
  69 }
  70
  71 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
  72 {
  73         if (dev) {
  74                 unsigned long pfn = dma_to_pfn(dev, addr);
  75
  76                 return phys_to_virt(__pfn_to_phys(pfn));
  77         }
  78
  79         return (void *)__bus_to_virt((unsigned long)addr);
  80 }
  81
  82 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
  83 {
  84         if (dev)
  85                 return pfn_to_dma(dev, virt_to_pfn(addr));
  86
  87         return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
  88 }
  89
  90 #else
  91 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
  92 {
  93         return __arch_pfn_to_dma(dev, pfn);
  94 }
  95
  96 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
  97 {
  98         return __arch_dma_to_pfn(dev, addr);
  99 }
 100
 101 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
 102 {
 103         return __arch_dma_to_virt(dev, addr);
 104 }
 105
 106 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
 107 {
 108         return __arch_virt_to_dma(dev, addr);
 109 }
 110 #endif
 111
 112 /* The ARM override for dma_max_pfn() */
 113 static inline unsigned long dma_max_pfn(struct device *dev)
 114 {
 115         return PHYS_PFN_OFFSET + dma_to_pfn(dev, *dev->dma_mask);
 116 }
 117 #define dma_max_pfn(dev) dma_max_pfn(dev)
 118
 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                                struct iommu_ops *iommu, bool coherent);
 122
 123 #define arch_teardown_dma_ops arch_teardown_dma_ops
 124 extern void arch_teardown_dma_ops(struct device *dev);
 125
 126 /* do not use this function in a driver */
 127 static inline bool is_device_dma_coherent(struct device *dev)
 128 {
 129         return dev->archdata.dma_coherent;
 130 }
 131
 132 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 133 {
 134         unsigned int offset = paddr & ~PAGE_MASK;
 135         return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
 136 }
 137
 138 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
 139 {
 140         unsigned int offset = dev_addr & ~PAGE_MASK;
 141         return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
 142 }
 143
 144 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 145 {
 146         u64 limit, mask;
 147
 148         if (!dev->dma_mask)
 149                 return 0;
 150
 151         mask = *dev->dma_mask;
 152
 153         limit = (mask + 1) & ~mask;
 154         if (limit && size > limit)
 155                 return 0;
 156
 157         if ((addr | (addr + size - 1)) & ~mask)
 158                 return 0;
 159
 160         return 1;
 161 }
 162
 163 static inline void dma_mark_clean(void *addr, size_t size) { }
 164
 165 extern int arm_dma_set_mask(struct device *dev, u64 dma_mask);
 166
 167 /**
 168  * arm_dma_alloc - allocate consistent memory for DMA
 169  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 170  * @size: required memory size
 171  * @handle: bus-specific DMA address
 172  * @attrs: optinal attributes that specific mapping properties
 173  *
 174  * Allocate some memory for a device for performing DMA.  This function
 175  * allocates pages, and will return the CPU-viewed address, and sets @handle
 176  * to be the device-viewed address.
 177  */
 178 extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
 179                            gfp_t gfp, struct dma_attrs *attrs);
 180
 181 /**
 182  * arm_dma_free - free memory allocated by arm_dma_alloc
 183  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 184  * @size: size of memory originally requested in dma_alloc_coherent
 185  * @cpu_addr: CPU-view address returned from dma_alloc_coherent
 186  * @handle: device-view address returned from dma_alloc_coherent
 187  * @attrs: optinal attributes that specific mapping properties
 188  *
 189  * Free (and unmap) a DMA buffer previously allocated by
 190  * arm_dma_alloc().
 191  *
 192  * References to memory and mappings associated with cpu_addr/handle
 193  * during and after this call executing are illegal.
 194  */
 195 extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
 196                          dma_addr_t handle, struct dma_attrs *attrs);
 197
 198 /**
 199  * arm_dma_mmap - map a coherent DMA allocation into user space
 200  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 201  * @vma: vm_area_struct describing requested user mapping
 202  * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
 203  * @handle: device-view address returned from dma_alloc_coherent
 204  * @size: size of memory originally requested in dma_alloc_coherent
 205  * @attrs: optinal attributes that specific mapping properties
 206  *
 207  * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
 208  * into user space.  The coherent DMA buffer must not be freed by the
 209  * driver until the user space mapping has been released.
 210  */
 211 extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
 212                         void *cpu_addr, dma_addr_t dma_addr, size_t size,
 213                         struct dma_attrs *attrs);
 214
 215 /*
 216  * This can be called during early boot to increase the size of the atomic
 217  * coherent DMA pool above the default value of 256KiB. It must be called
 218  * before postcore_initcall.
 219  */
 220 extern void __init init_dma_coherent_pool_size(unsigned long size);
 221
 222 /*
 223  * For SA-1111, IXP425, and ADI systems  the dma-mapping functions are "magic"
 224  * and utilize bounce buffers as needed to work around limited DMA windows.
 225  *
 226  * On the SA-1111, a bug limits DMA to only certain regions of RAM.
 227  * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
 228  * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
 229  *
 230  * The following are helper functions used by the dmabounce subystem
 231  *
 232  */
 233
 234 /**
 235  * dmabounce_register_dev
 236  *
 237  * @dev: valid struct device pointer
 238  * @small_buf_size: size of buffers to use with small buffer pool
 239  * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
 240  * @needs_bounce_fn: called to determine whether buffer needs bouncing
 241  *
 242  * This function should be called by low-level platform code to register
 243  * a device as requireing DMA buffer bouncing. The function will allocate
 244  * appropriate DMA pools for the device.
 245  */
 246 extern int dmabounce_register_dev(struct device *, unsigned long,
 247                 unsigned long, int (*)(struct device *, dma_addr_t, size_t));
 248
 249 /**
 250  * dmabounce_unregister_dev
 251  *
 252  * @dev: valid struct device pointer
 253  *
 254  * This function should be called by low-level platform code when device
 255  * that was previously registered with dmabounce_register_dev is removed
 256  * from the system.
 257  *
 258  */
 259 extern void dmabounce_unregister_dev(struct device *);
 260
 261
 262
 263 /*
 264  * The scatter list versions of the above methods.
 265  */
 266 extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
 267                 enum dma_data_direction, struct dma_attrs *attrs);
 268 extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
 269                 enum dma_data_direction, struct dma_attrs *attrs);
 270 extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
 271                 enum dma_data_direction);
 272 extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
 273                 enum dma_data_direction);
 274 extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
 275                 void *cpu_addr, dma_addr_t dma_addr, size_t size,
 276                 struct dma_attrs *attrs);
 277
 278 #endif /* __KERNEL__ */
 279 #endif