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

   1 /*
   2  * DMA Mapping glue for ARC
   3  *
   4  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #ifndef ASM_ARC_DMA_MAPPING_H
  12 #define ASM_ARC_DMA_MAPPING_H
  13
  14 #include <asm-generic/dma-coherent.h>
  15 #include <asm/cacheflush.h>
  16
  17 #ifndef CONFIG_ARC_PLAT_NEEDS_CPU_TO_DMA
  18 /*
  19  * dma_map_* API take cpu addresses, which is kernel logical address in the
  20  * untranslated address space (0x8000_0000) based. The dma address (bus addr)
  21  * ideally needs to be 0x0000_0000 based hence these glue routines.
  22  * However given that intermediate bus bridges can ignore the high bit, we can
  23  * do with these routines being no-ops.
  24  * If a platform/device comes up which sriclty requires 0 based bus addr
  25  * (e.g. AHB-PCI bridge on Angel4 board), then it can provide it's own versions
  26  */
  27 #define plat_dma_addr_to_kernel(dev, addr) ((unsigned long)(addr))
  28 #define plat_kernel_addr_to_dma(dev, ptr) ((dma_addr_t)(ptr))
  29
  30 #else
  31 #include <plat/dma_addr.h>
  32 #endif
  33
  34 void *dma_alloc_noncoherent(struct device *dev, size_t size,
  35                             dma_addr_t *dma_handle, gfp_t gfp);
  36
  37 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
  38                           dma_addr_t dma_handle);
  39
  40 void *dma_alloc_coherent(struct device *dev, size_t size,
  41                          dma_addr_t *dma_handle, gfp_t gfp);
  42
  43 void dma_free_coherent(struct device *dev, size_t size, void *kvaddr,
  44                        dma_addr_t dma_handle);
  45
  46 /* drivers/base/dma-mapping.c */
  47 extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
  48                            void *cpu_addr, dma_addr_t dma_addr, size_t size);
  49 extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
  50                                   void *cpu_addr, dma_addr_t dma_addr,
  51                                   size_t size);
  52
  53 #define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)
  54 #define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)
  55
  56 /*
  57  * streaming DMA Mapping API...
  58  * CPU accesses page via normal paddr, thus needs to explicitly made
  59  * consistent before each use
  60  */
  61
  62 static inline void __inline_dma_cache_sync(unsigned long paddr, size_t size,
  63                                            enum dma_data_direction dir)
  64 {
  65         switch (dir) {
  66         case DMA_FROM_DEVICE:
  67                 dma_cache_inv(paddr, size);
  68                 break;
  69         case DMA_TO_DEVICE:
  70                 dma_cache_wback(paddr, size);
  71                 break;
  72         case DMA_BIDIRECTIONAL:
  73                 dma_cache_wback_inv(paddr, size);
  74                 break;
  75         default:
  76                 pr_err("Invalid DMA dir [%d] for OP @ %lx\n", dir, paddr);
  77         }
  78 }
  79
  80 void __arc_dma_cache_sync(unsigned long paddr, size_t size,
  81                           enum dma_data_direction dir);
  82
  83 #define _dma_cache_sync(addr, sz, dir)                  \
  84 do {                                                    \
  85         if (__builtin_constant_p(dir))                  \
  86                 __inline_dma_cache_sync(addr, sz, dir); \
  87         else                                            \
  88                 __arc_dma_cache_sync(addr, sz, dir);    \
  89 }                                                       \
  90 while (0);
  91
  92 static inline dma_addr_t
  93 dma_map_single(struct device *dev, void *cpu_addr, size_t size,
  94                enum dma_data_direction dir)
  95 {
  96         _dma_cache_sync((unsigned long)cpu_addr, size, dir);
  97         return plat_kernel_addr_to_dma(dev, cpu_addr);
  98 }
  99
 100 static inline void
 101 dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
 102                  size_t size, enum dma_data_direction dir)
 103 {
 104 }
 105
 106 static inline dma_addr_t
 107 dma_map_page(struct device *dev, struct page *page,
 108              unsigned long offset, size_t size,
 109              enum dma_data_direction dir)
 110 {
 111         unsigned long paddr = page_to_phys(page) + offset;
 112         return dma_map_single(dev, (void *)paddr, size, dir);
 113 }
 114
 115 static inline void
 116 dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
 117                size_t size, enum dma_data_direction dir)
 118 {
 119 }
 120
 121 static inline int
 122 dma_map_sg(struct device *dev, struct scatterlist *sg,
 123            int nents, enum dma_data_direction dir)
 124 {
 125         struct scatterlist *s;
 126         int i;
 127
 128         for_each_sg(sg, s, nents, i)
 129                 s->dma_address = dma_map_page(dev, sg_page(s), s->offset,
 130                                                s->length, dir);
 131
 132         return nents;
 133 }
 134
 135 static inline void
 136 dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 137              int nents, enum dma_data_direction dir)
 138 {
 139         struct scatterlist *s;
 140         int i;
 141
 142         for_each_sg(sg, s, nents, i)
 143                 dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir);
 144 }
 145
 146 static inline void
 147 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 148                         size_t size, enum dma_data_direction dir)
 149 {
 150         _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle), size,
 151                         DMA_FROM_DEVICE);
 152 }
 153
 154 static inline void
 155 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 156                            size_t size, enum dma_data_direction dir)
 157 {
 158         _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle), size,
 159                         DMA_TO_DEVICE);
 160 }
 161
 162 static inline void
 163 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 164                               unsigned long offset, size_t size,
 165                               enum dma_data_direction direction)
 166 {
 167         _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle) + offset,
 168                         size, DMA_FROM_DEVICE);
 169 }
 170
 171 static inline void
 172 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 173                                  unsigned long offset, size_t size,
 174                                  enum dma_data_direction direction)
 175 {
 176         _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle) + offset,
 177                         size, DMA_TO_DEVICE);
 178 }
 179
 180 static inline void
 181 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 182                     enum dma_data_direction dir)
 183 {
 184         int i;
 185
 186         for (i = 0; i < nelems; i++, sg++)
 187                 _dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
 188 }
 189
 190 static inline void
 191 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 192                        enum dma_data_direction dir)
 193 {
 194         int i;
 195
 196         for (i = 0; i < nelems; i++, sg++)
 197                 _dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
 198 }
 199
 200 static inline int dma_supported(struct device *dev, u64 dma_mask)
 201 {
 202         /* Support 32 bit DMA mask exclusively */
 203         return dma_mask == DMA_BIT_MASK(32);
 204 }
 205
 206 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 207 {
 208         return 0;
 209 }
 210
 211 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 212 {
 213         if (!dev->dma_mask || !dma_supported(dev, dma_mask))
 214                 return -EIO;
 215
 216         *dev->dma_mask = dma_mask;
 217
 218         return 0;
 219 }
 220
 221 #endif