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/PCI/PCI-DMA-mapping.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 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
  35
  36 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  37 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  38
  39 void *or1k_dma_alloc_coherent(struct device *dev, size_t size,
  40                               dma_addr_t *dma_handle, gfp_t flag);
  41 void or1k_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  42                             dma_addr_t dma_handle);
  43 dma_addr_t or1k_map_page(struct device *dev, struct page *page,
  44                          unsigned long offset, size_t size,
  45                          enum dma_data_direction dir,
  46                          struct dma_attrs *attrs);
  47 void or1k_unmap_page(struct device *dev, dma_addr_t dma_handle,
  48                      size_t size, enum dma_data_direction dir,
  49                      struct dma_attrs *attrs);
  50 void or1k_sync_single_for_cpu(struct device *dev,
  51                               dma_addr_t dma_handle, size_t size,
  52                               enum dma_data_direction dir);
  53 void or1k_sync_single_for_device(struct device *dev,
  54                                  dma_addr_t dma_handle, size_t size,
  55                                  enum dma_data_direction dir);
  56
  57 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
  58                                         dma_addr_t *dma_handle, gfp_t flag)
  59 {
  60         void *memory;
  61
  62         memory = or1k_dma_alloc_coherent(dev, size, dma_handle, flag);
  63
  64         debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
  65         return memory;
  66 }
  67
  68 static inline void dma_free_coherent(struct device *dev, size_t size,
  69                                      void *cpu_addr, dma_addr_t dma_handle)
  70 {
  71         debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
  72         or1k_dma_free_coherent(dev, size, cpu_addr, dma_handle);
  73 }
  74
  75 static inline dma_addr_t dma_map_single(struct device *dev, void *ptr,
  76                                         size_t size,
  77                                         enum dma_data_direction dir)
  78 {
  79         dma_addr_t addr;
  80
  81         kmemcheck_mark_initialized(ptr, size);
  82         BUG_ON(!valid_dma_direction(dir));
  83         addr = or1k_map_page(dev, virt_to_page(ptr),
  84                              (unsigned long)ptr & ~PAGE_MASK, size,
  85                              dir, NULL);
  86         debug_dma_map_page(dev, virt_to_page(ptr),
  87                            (unsigned long)ptr & ~PAGE_MASK, size,
  88                            dir, addr, true);
  89         return addr;
  90 }
  91
  92 static inline void dma_unmap_single(struct device *dev, dma_addr_t addr,
  93                                           size_t size,
  94                                           enum dma_data_direction dir)
  95 {
  96         BUG_ON(!valid_dma_direction(dir));
  97         or1k_unmap_page(dev, addr, size, dir, NULL);
  98         debug_dma_unmap_page(dev, addr, size, dir, true);
  99 }
 100
 101 static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 102                                            size_t size,
 103                                            enum dma_data_direction dir)
 104 {
 105         BUG_ON(!valid_dma_direction(dir));
 106         or1k_sync_single_for_cpu(dev, addr, size, dir);
 107         debug_dma_sync_single_for_cpu(dev, addr, size, dir);
 108 }
 109
 110 static inline void dma_sync_single_for_device(struct device *dev,
 111                                               dma_addr_t addr, size_t size,
 112                                               enum dma_data_direction dir)
 113 {
 114         BUG_ON(!valid_dma_direction(dir));
 115         or1k_sync_single_for_device(dev, addr, size, dir);
 116         debug_dma_sync_single_for_device(dev, addr, size, dir);
 117 }
 118
 119 static inline int dma_supported(struct device *dev, u64 dma_mask)
 120 {
 121         /* Support 32 bit DMA mask exclusively */
 122         return dma_mask == 0xffffffffULL;
 123 }
 124
 125 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 126 {
 127         if (!dev->dma_mask || !dma_supported(dev, dma_mask))
 128                 return -EIO;
 129
 130         *dev->dma_mask = dma_mask;
 131
 132         return 0;
 133 }
 134 #endif  /* __ASM_OPENRISC_DMA_MAPPING_H */