LXR linux/arch/microblaze/include/asm/dma-mapping.h

   1/*
   2 * Implements the generic device dma API for microblaze and the pci
   3 *
   4 * Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu>
   5 * Copyright (C) 2009-2010 PetaLogix
   6 *
   7 * This file is subject to the terms and conditions of the GNU General
   8 * Public License. See the file COPYING in the main directory of this
   9 * archive for more details.
  10 *
  11 * This file is base on powerpc and x86 dma-mapping.h versions
  12 * Copyright (C) 2004 IBM
  13 */
  14
  15#ifndef _ASM_MICROBLAZE_DMA_MAPPING_H
  16#define _ASM_MICROBLAZE_DMA_MAPPING_H
  17
  18/*
  19 * See Documentation/DMA-API-HOWTO.txt and
  20 * Documentation/DMA-API.txt for documentation.
  21 */
  22
  23#include <linux/types.h>
  24#include <linux/cache.h>
  25#include <linux/mm.h>
  26#include <linux/scatterlist.h>
  27#include <linux/dma-debug.h>
  28#include <linux/dma-attrs.h>
  29#include <asm/io.h>
  30#include <asm-generic/dma-coherent.h>
  31#include <asm/cacheflush.h>
  32
  33#define DMA_ERROR_CODE          (~(dma_addr_t)0x0)
  34
  35#define __dma_alloc_coherent(dev, gfp, size, handle)    NULL
  36#define __dma_free_coherent(size, addr)         ((void)0)
  37
  38static inline unsigned long device_to_mask(struct device *dev)
  39{
  40        if (dev->dma_mask && *dev->dma_mask)
  41                return *dev->dma_mask;
  42        /* Assume devices without mask can take 32 bit addresses */
  43        return 0xfffffffful;
  44}
  45
  46extern struct dma_map_ops *dma_ops;
  47
  48/*
  49 * Available generic sets of operations
  50 */
  51extern struct dma_map_ops dma_direct_ops;
  52
  53static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  54{
  55        /* We don't handle the NULL dev case for ISA for now. We could
  56         * do it via an out of line call but it is not needed for now. The
  57         * only ISA DMA device we support is the floppy and we have a hack
  58         * in the floppy driver directly to get a device for us.
  59         */
  60        if (unlikely(!dev) || !dev->archdata.dma_ops)
  61                return NULL;
  62
  63        return dev->archdata.dma_ops;
  64}
  65
  66static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
  67{
  68        dev->archdata.dma_ops = ops;
  69}
  70
  71static inline int dma_supported(struct device *dev, u64 mask)
  72{
  73        struct dma_map_ops *ops = get_dma_ops(dev);
  74
  75        if (unlikely(!ops))
  76                return 0;
  77        if (!ops->dma_supported)
  78                return 1;
  79        return ops->dma_supported(dev, mask);
  80}
  81
  82static inline int dma_set_mask(struct device *dev, u64 dma_mask)
  83{
  84        struct dma_map_ops *ops = get_dma_ops(dev);
  85
  86        if (unlikely(ops == NULL))
  87                return -EIO;
  88        if (ops->set_dma_mask)
  89                return ops->set_dma_mask(dev, dma_mask);
  90        if (!dev->dma_mask || !dma_supported(dev, dma_mask))
  91                return -EIO;
  92        *dev->dma_mask = dma_mask;
  93        return 0;
  94}
  95
  96#include <asm-generic/dma-mapping-common.h>
  97
  98static inline void __dma_sync(unsigned long paddr,
  99                              size_t size, enum dma_data_direction direction)
 100{
 101        switch (direction) {
 102        case DMA_TO_DEVICE:
 103        case DMA_BIDIRECTIONAL:
 104                flush_dcache_range(paddr, paddr + size);
 105                break;
 106        case DMA_FROM_DEVICE:
 107                invalidate_dcache_range(paddr, paddr + size);
 108                break;
 109        default:
 110                BUG();
 111        }
 112}
 113
 114static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 115{
 116        struct dma_map_ops *ops = get_dma_ops(dev);
 117
 118        debug_dma_mapping_error(dev, dma_addr);
 119        if (ops->mapping_error)
 120                return ops->mapping_error(dev, dma_addr);
 121
 122        return (dma_addr == DMA_ERROR_CODE);
 123}
 124
 125#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 126#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 127
 128#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
 129
 130static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 131                                    dma_addr_t *dma_handle, gfp_t flag,
 132                                    struct dma_attrs *attrs)
 133{
 134        struct dma_map_ops *ops = get_dma_ops(dev);
 135        void *memory;
 136
 137        BUG_ON(!ops);
 138
 139        memory = ops->alloc(dev, size, dma_handle, flag, attrs);
 140
 141        debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
 142        return memory;
 143}
 144
 145#define dma_free_coherent(d,s,c,h) dma_free_attrs(d, s, c, h, NULL)
 146
 147static inline void dma_free_attrs(struct device *dev, size_t size,
 148                                  void *cpu_addr, dma_addr_t dma_handle,
 149                                  struct dma_attrs *attrs)
 150{
 151        struct dma_map_ops *ops = get_dma_ops(dev);
 152
 153        BUG_ON(!ops);
 154        debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 155        ops->free(dev, size, cpu_addr, dma_handle, attrs);
 156}
 157
 158static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 159                enum dma_data_direction direction)
 160{
 161        BUG_ON(direction == DMA_NONE);
 162        __dma_sync(virt_to_phys(vaddr), size, (int)direction);
 163}
 164
 165#endif  /* _ASM_MICROBLAZE_DMA_MAPPING_H */
 166