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

   1 /*
   2  * OpenRISC Linux
   3  *
   4  * Linux architectural port borrowing liberally from similar works of
   5  * others.  All original copyrights apply as per the original source
   6  * declaration.
   7  *
   8  * OpenRISC implementation:
   9  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  */
  16
  17 #ifndef __ASM_OPENRISC_DMA_MAPPING_H
  18 #define __ASM_OPENRISC_DMA_MAPPING_H
  19
  20 /*
  21  * See Documentation/DMA-API-HOWTO.txt and
  22  * Documentation/DMA-API.txt for documentation.
  23  *
  24  * This file is written with the intention of eventually moving over
  25  * to largely using asm-generic/dma-mapping-common.h in its place.
  26  */
  27
  28 #include <linux/dma-debug.h>
  29 #include <asm-generic/dma-coherent.h>
  30 #include <linux/kmemcheck.h>
  31
  32 #define DMA_ERROR_CODE          (~(dma_addr_t)0x0)
  33
  34
  35 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  36 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  37
  38 void *or1k_dma_alloc_coherent(struct device *dev, size_t size,
  39                               dma_addr_t *dma_handle, gfp_t flag);
  40 void or1k_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  41                             dma_addr_t dma_handle);
  42 dma_addr_t or1k_map_page(struct device *dev, struct page *page,
  43                          unsigned long offset, size_t size,
  44                          enum dma_data_direction dir,
  45                          struct dma_attrs *attrs);
  46 void or1k_unmap_page(struct device *dev, dma_addr_t dma_handle,
  47                      size_t size, enum dma_data_direction dir,
  48                      struct dma_attrs *attrs);
  49 int or1k_map_sg(struct device *dev, struct scatterlist *sg,
  50                 int nents, enum dma_data_direction dir,
  51                 struct dma_attrs *attrs);
  52 void or1k_unmap_sg(struct device *dev, struct scatterlist *sg,
  53                    int nents, enum dma_data_direction dir,
  54                    struct dma_attrs *attrs);
  55 void or1k_sync_single_for_cpu(struct device *dev,
  56                               dma_addr_t dma_handle, size_t size,
  57                               enum dma_data_direction dir);
  58 void or1k_sync_single_for_device(struct device *dev,
  59                                  dma_addr_t dma_handle, size_t size,
  60                                  enum dma_data_direction dir);
  61
  62 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
  63                                         dma_addr_t *dma_handle, gfp_t flag)
  64 {
  65         void *memory;
  66
  67         memory = or1k_dma_alloc_coherent(dev, size, dma_handle, flag);
  68
  69         debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
  70         return memory;
  71 }
  72
  73 static inline void dma_free_coherent(struct device *dev, size_t size,
  74                                      void *cpu_addr, dma_addr_t dma_handle)
  75 {
  76         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
  77         or1k_dma_free_coherent(dev, size, cpu_addr, dma_handle);
  78 }
  79
  80 static inline dma_addr_t dma_map_single(struct device *dev, void *ptr,
  81                                         size_t size,
  82                                         enum dma_data_direction dir)
  83 {
  84         dma_addr_t addr;
  85
  86         kmemcheck_mark_initialized(ptr, size);
  87         BUG_ON(!valid_dma_direction(dir));
  88         addr = or1k_map_page(dev, virt_to_page(ptr),
  89                              (unsigned long)ptr & ~PAGE_MASK, size,
  90                              dir, NULL);
  91         debug_dma_map_page(dev, virt_to_page(ptr),
  92                            (unsigned long)ptr & ~PAGE_MASK, size,
  93                            dir, addr, true);
  94         return addr;
  95 }
  96
  97 static inline void dma_unmap_single(struct device *dev, dma_addr_t addr,
  98                                           size_t size,
  99                                           enum dma_data_direction dir)
 100 {
 101         BUG_ON(!valid_dma_direction(dir));
 102         or1k_unmap_page(dev, addr, size, dir, NULL);
 103         debug_dma_unmap_page(dev, addr, size, dir, true);
 104 }
 105
 106 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
 107                                    int nents, enum dma_data_direction dir)
 108 {
 109         int i, ents;
 110         struct scatterlist *s;
 111
 112         for_each_sg(sg, s, nents, i)
 113                 kmemcheck_mark_initialized(sg_virt(s), s->length);
 114         BUG_ON(!valid_dma_direction(dir));
 115         ents = or1k_map_sg(dev, sg, nents, dir, NULL);
 116         debug_dma_map_sg(dev, sg, nents, ents, dir);
 117
 118         return ents;
 119 }
 120
 121 static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 122                                       int nents, enum dma_data_direction dir)
 123 {
 124         BUG_ON(!valid_dma_direction(dir));
 125         debug_dma_unmap_sg(dev, sg, nents, dir);
 126         or1k_unmap_sg(dev, sg, nents, dir, NULL);
 127 }
 128
 129 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 130                                       size_t offset, size_t size,
 131                                       enum dma_data_direction dir)
 132 {
 133         dma_addr_t addr;
 134
 135         kmemcheck_mark_initialized(page_address(page) + offset, size);
 136         BUG_ON(!valid_dma_direction(dir));
 137         addr = or1k_map_page(dev, page, offset, size, dir, NULL);
 138         debug_dma_map_page(dev, page, offset, size, dir, addr, false);
 139
 140         return addr;
 141 }
 142
 143 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 144                                   size_t size, enum dma_data_direction dir)
 145 {
 146         BUG_ON(!valid_dma_direction(dir));
 147         or1k_unmap_page(dev, addr, size, dir, NULL);
 148         debug_dma_unmap_page(dev, addr, size, dir, true);
 149 }
 150
 151 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 152                                            size_t size,
 153                                            enum dma_data_direction dir)
 154 {
 155         BUG_ON(!valid_dma_direction(dir));
 156         or1k_sync_single_for_cpu(dev, addr, size, dir);
 157         debug_dma_sync_single_for_cpu(dev, addr, size, dir);
 158 }
 159
 160 static inline void dma_sync_single_for_device(struct device *dev,
 161                                               dma_addr_t addr, size_t size,
 162                                               enum dma_data_direction dir)
 163 {
 164         BUG_ON(!valid_dma_direction(dir));
 165         or1k_sync_single_for_device(dev, addr, size, dir);
 166         debug_dma_sync_single_for_device(dev, addr, size, dir);
 167 }
 168
 169 static inline int dma_supported(struct device *dev, u64 dma_mask)
 170 {
 171         /* Support 32 bit DMA mask exclusively */
 172         return dma_mask == DMA_BIT_MASK(32);
 173 }
 174
 175 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 176 {
 177         return 0;
 178 }
 179
 180 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 181 {
 182         if (!dev->dma_mask || !dma_supported(dev, dma_mask))
 183                 return -EIO;
 184
 185         *dev->dma_mask = dma_mask;
 186
 187         return 0;
 188 }
 189 #endif  /* __ASM_OPENRISC_DMA_MAPPING_H */