LXR linux/arch/arm64/include/asm/dma-mapping.h

   1/*
   2 * Copyright (C) 2012 ARM Ltd.
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16#ifndef __ASM_DMA_MAPPING_H
  17#define __ASM_DMA_MAPPING_H
  18
  19#ifdef __KERNEL__
  20
  21#include <linux/types.h>
  22#include <linux/vmalloc.h>
  23
  24#include <asm-generic/dma-coherent.h>
  25
  26#include <xen/xen.h>
  27#include <asm/xen/hypervisor.h>
  28
  29#define DMA_ERROR_CODE  (~(dma_addr_t)0)
  30extern struct dma_map_ops *dma_ops;
  31extern struct dma_map_ops coherent_swiotlb_dma_ops;
  32extern struct dma_map_ops noncoherent_swiotlb_dma_ops;
  33
  34static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
  35{
  36        if (unlikely(!dev) || !dev->archdata.dma_ops)
  37                return dma_ops;
  38        else
  39                return dev->archdata.dma_ops;
  40}
  41
  42static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  43{
  44        if (xen_initial_domain())
  45                return xen_dma_ops;
  46        else
  47                return __generic_dma_ops(dev);
  48}
  49
  50static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
  51{
  52        dev->archdata.dma_ops = ops;
  53}
  54
  55static inline int set_arch_dma_coherent_ops(struct device *dev)
  56{
  57        set_dma_ops(dev, &coherent_swiotlb_dma_ops);
  58        return 0;
  59}
  60#define set_arch_dma_coherent_ops       set_arch_dma_coherent_ops
  61
  62#include <asm-generic/dma-mapping-common.h>
  63
  64static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  65{
  66        return (dma_addr_t)paddr;
  67}
  68
  69static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  70{
  71        return (phys_addr_t)dev_addr;
  72}
  73
  74static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
  75{
  76        struct dma_map_ops *ops = get_dma_ops(dev);
  77        debug_dma_mapping_error(dev, dev_addr);
  78        return ops->mapping_error(dev, dev_addr);
  79}
  80
  81static inline int dma_supported(struct device *dev, u64 mask)
  82{
  83        struct dma_map_ops *ops = get_dma_ops(dev);
  84        return ops->dma_supported(dev, mask);
  85}
  86
  87static inline int dma_set_mask(struct device *dev, u64 mask)
  88{
  89        if (!dev->dma_mask || !dma_supported(dev, mask))
  90                return -EIO;
  91        *dev->dma_mask = mask;
  92
  93        return 0;
  94}
  95
  96static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  97{
  98        if (!dev->dma_mask)
  99                return 0;
 100
 101        return addr + size - 1 <= *dev->dma_mask;
 102}
 103
 104static inline void dma_mark_clean(void *addr, size_t size)
 105{
 106}
 107
 108#define dma_alloc_coherent(d, s, h, f)  dma_alloc_attrs(d, s, h, f, NULL)
 109#define dma_free_coherent(d, s, h, f)   dma_free_attrs(d, s, h, f, NULL)
 110
 111static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 112                                    dma_addr_t *dma_handle, gfp_t flags,
 113                                    struct dma_attrs *attrs)
 114{
 115        struct dma_map_ops *ops = get_dma_ops(dev);
 116        void *vaddr;
 117
 118        if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
 119                return vaddr;
 120
 121        vaddr = ops->alloc(dev, size, dma_handle, flags, attrs);
 122        debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
 123        return vaddr;
 124}
 125
 126static inline void dma_free_attrs(struct device *dev, size_t size,
 127                                  void *vaddr, dma_addr_t dev_addr,
 128                                  struct dma_attrs *attrs)
 129{
 130        struct dma_map_ops *ops = get_dma_ops(dev);
 131
 132        if (dma_release_from_coherent(dev, get_order(size), vaddr))
 133                return;
 134
 135        debug_dma_free_coherent(dev, size, vaddr, dev_addr);
 136        ops->free(dev, size, vaddr, dev_addr, attrs);
 137}
 138
 139/*
 140 * There is no dma_cache_sync() implementation, so just return NULL here.
 141 */
 142static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 143                                          dma_addr_t *handle, gfp_t flags)
 144{
 145        return NULL;
 146}
 147
 148static inline void dma_free_noncoherent(struct device *dev, size_t size,
 149                                        void *cpu_addr, dma_addr_t handle)
 150{
 151}
 152
 153#endif  /* __KERNEL__ */
 154#endif  /* __ASM_DMA_MAPPING_H */
 155