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;
  31
  32static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
  33{
  34        if (unlikely(!dev) || !dev->archdata.dma_ops)
  35                return dma_ops;
  36        else
  37                return dev->archdata.dma_ops;
  38}
  39
  40static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  41{
  42        if (xen_initial_domain())
  43                return xen_dma_ops;
  44        else
  45                return __generic_dma_ops(dev);
  46}
  47
  48static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
  49                                      struct iommu_ops *iommu, bool coherent)
  50{
  51        dev->archdata.dma_coherent = coherent;
  52}
  53#define arch_setup_dma_ops      arch_setup_dma_ops
  54
  55/* do not use this function in a driver */
  56static inline bool is_device_dma_coherent(struct device *dev)
  57{
  58        if (!dev)
  59                return false;
  60        return dev->archdata.dma_coherent;
  61}
  62
  63#include <asm-generic/dma-mapping-common.h>
  64
  65static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  66{
  67        return (dma_addr_t)paddr;
  68}
  69
  70static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  71{
  72        return (phys_addr_t)dev_addr;
  73}
  74
  75static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
  76{
  77        struct dma_map_ops *ops = get_dma_ops(dev);
  78        debug_dma_mapping_error(dev, dev_addr);
  79        return ops->mapping_error(dev, dev_addr);
  80}
  81
  82static inline int dma_supported(struct device *dev, u64 mask)
  83{
  84        struct dma_map_ops *ops = get_dma_ops(dev);
  85        return ops->dma_supported(dev, mask);
  86}
  87
  88static inline int dma_set_mask(struct device *dev, u64 mask)
  89{
  90        if (!dev->dma_mask || !dma_supported(dev, mask))
  91                return -EIO;
  92        *dev->dma_mask = mask;
  93
  94        return 0;
  95}
  96
  97static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  98{
  99        if (!dev->dma_mask)
 100                return false;
 101
 102        return addr + size - 1 <= *dev->dma_mask;
 103}
 104
 105static inline void dma_mark_clean(void *addr, size_t size)
 106{
 107}
 108
 109#define dma_alloc_coherent(d, s, h, f)  dma_alloc_attrs(d, s, h, f, NULL)
 110#define dma_free_coherent(d, s, h, f)   dma_free_attrs(d, s, h, f, NULL)
 111
 112static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 113                                    dma_addr_t *dma_handle, gfp_t flags,
 114                                    struct dma_attrs *attrs)
 115{
 116        struct dma_map_ops *ops = get_dma_ops(dev);
 117        void *vaddr;
 118
 119        if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
 120                return vaddr;
 121
 122        vaddr = ops->alloc(dev, size, dma_handle, flags, attrs);
 123        debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
 124        return vaddr;
 125}
 126
 127static inline void dma_free_attrs(struct device *dev, size_t size,
 128                                  void *vaddr, dma_addr_t dev_addr,
 129                                  struct dma_attrs *attrs)
 130{
 131        struct dma_map_ops *ops = get_dma_ops(dev);
 132
 133        if (dma_release_from_coherent(dev, get_order(size), vaddr))
 134                return;
 135
 136        debug_dma_free_coherent(dev, size, vaddr, dev_addr);
 137        ops->free(dev, size, vaddr, dev_addr, attrs);
 138}
 139
 140/*
 141 * There is no dma_cache_sync() implementation, so just return NULL here.
 142 */
 143static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 144                                          dma_addr_t *handle, gfp_t flags)
 145{
 146        return NULL;
 147}
 148
 149static inline void dma_free_noncoherent(struct device *dev, size_t size,
 150                                        void *cpu_addr, dma_addr_t handle)
 151{
 152}
 153
 154#endif  /* __KERNEL__ */
 155#endif  /* __ASM_DMA_MAPPING_H */
 156