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

   1/*
   2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3 *
   4 *   This program is free software; you can redistribute it and/or
   5 *   modify it under the terms of the GNU General Public License
   6 *   as published by the Free Software Foundation, version 2.
   7 *
   8 *   This program is distributed in the hope that it will be useful, but
   9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11 *   NON INFRINGEMENT.  See the GNU General Public License for
  12 *   more details.
  13 */
  14
  15#ifndef _ASM_TILE_DMA_MAPPING_H
  16#define _ASM_TILE_DMA_MAPPING_H
  17
  18#include <linux/mm.h>
  19#include <linux/scatterlist.h>
  20#include <linux/cache.h>
  21#include <linux/io.h>
  22
  23#ifdef __tilegx__
  24#define ARCH_HAS_DMA_GET_REQUIRED_MASK
  25#endif
  26
  27extern struct dma_map_ops *tile_dma_map_ops;
  28extern struct dma_map_ops *gx_pci_dma_map_ops;
  29extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;
  30extern struct dma_map_ops *gx_hybrid_pci_dma_map_ops;
  31
  32static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  33{
  34        if (dev && dev->archdata.dma_ops)
  35                return dev->archdata.dma_ops;
  36        else
  37                return tile_dma_map_ops;
  38}
  39
  40static inline dma_addr_t get_dma_offset(struct device *dev)
  41{
  42        return dev->archdata.dma_offset;
  43}
  44
  45static inline void set_dma_offset(struct device *dev, dma_addr_t off)
  46{
  47        dev->archdata.dma_offset = off;
  48}
  49
  50static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  51{
  52        return paddr;
  53}
  54
  55static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  56{
  57        return daddr;
  58}
  59
  60static inline void dma_mark_clean(void *addr, size_t size) {}
  61
  62#include <asm-generic/dma-mapping-common.h>
  63
  64static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
  65{
  66        dev->archdata.dma_ops = ops;
  67}
  68
  69static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  70{
  71        if (!dev->dma_mask)
  72                return 0;
  73
  74        return addr + size - 1 <= *dev->dma_mask;
  75}
  76
  77static inline int
  78dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
  79{
  80        debug_dma_mapping_error(dev, dma_addr);
  81        return get_dma_ops(dev)->mapping_error(dev, dma_addr);
  82}
  83
  84static inline int
  85dma_supported(struct device *dev, u64 mask)
  86{
  87        return get_dma_ops(dev)->dma_supported(dev, mask);
  88}
  89
  90static inline int
  91dma_set_mask(struct device *dev, u64 mask)
  92{
  93        struct dma_map_ops *dma_ops = get_dma_ops(dev);
  94
  95        /*
  96         * For PCI devices with 64-bit DMA addressing capability, promote
  97         * the dma_ops to hybrid, with the consistent memory DMA space limited
  98         * to 32-bit. For 32-bit capable devices, limit the streaming DMA
  99         * address range to max_direct_dma_addr.
 100         */
 101        if (dma_ops == gx_pci_dma_map_ops ||
 102            dma_ops == gx_hybrid_pci_dma_map_ops ||
 103            dma_ops == gx_legacy_pci_dma_map_ops) {
 104                if (mask == DMA_BIT_MASK(64) &&
 105                    dma_ops == gx_legacy_pci_dma_map_ops)
 106                        set_dma_ops(dev, gx_hybrid_pci_dma_map_ops);
 107                else if (mask > dev->archdata.max_direct_dma_addr)
 108                        mask = dev->archdata.max_direct_dma_addr;
 109        }
 110
 111        if (!dev->dma_mask || !dma_supported(dev, mask))
 112                return -EIO;
 113
 114        *dev->dma_mask = mask;
 115
 116        return 0;
 117}
 118
 119static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 120                                    dma_addr_t *dma_handle, gfp_t flag,
 121                                    struct dma_attrs *attrs)
 122{
 123        struct dma_map_ops *dma_ops = get_dma_ops(dev);
 124        void *cpu_addr;
 125
 126        cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs);
 127
 128        debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 129
 130        return cpu_addr;
 131}
 132
 133static inline void dma_free_attrs(struct device *dev, size_t size,
 134                                  void *cpu_addr, dma_addr_t dma_handle,
 135                                  struct dma_attrs *attrs)
 136{
 137        struct dma_map_ops *dma_ops = get_dma_ops(dev);
 138
 139        debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 140
 141        dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
 142}
 143
 144#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
 145#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
 146#define dma_free_coherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
 147#define dma_free_noncoherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
 148
 149/*
 150 * dma_alloc_noncoherent() is #defined to return coherent memory,
 151 * so there's no need to do any flushing here.
 152 */
 153static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 154                                  enum dma_data_direction direction)
 155{
 156}
 157
 158#endif /* _ASM_TILE_DMA_MAPPING_H */
 159