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dma-mapping.h

#ifndef __ASM_SH_DMA_MAPPING_H
#define __ASM_SH_DMA_MAPPING_H

#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
#include <asm-generic/dma-coherent.h>

extern struct bus_type pci_bus_type;

#define dma_supported(dev, mask)    (1)

static inline int dma_set_mask(struct device *dev, u64 mask)
{
      if (!dev->dma_mask || !dma_supported(dev, mask))
            return -EIO;

      *dev->dma_mask = mask;

      return 0;
}

void *dma_alloc_coherent(struct device *dev, size_t size,
                   dma_addr_t *dma_handle, gfp_t flag);

void dma_free_coherent(struct device *dev, size_t size,
                   void *vaddr, dma_addr_t dma_handle);

void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
                enum dma_data_direction dir);

#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
#define dma_is_consistent(d, h) (1)

static inline dma_addr_t dma_map_single(struct device *dev,
                              void *ptr, size_t size,
                              enum dma_data_direction dir)
{
#if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
      if (dev->bus == &pci_bus_type)
            return virt_to_phys(ptr);
#endif
      dma_cache_sync(dev, ptr, size, dir);

      return virt_to_phys(ptr);
}

#define dma_unmap_single(dev, addr, size, dir)  do { } while (0)

static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
                       int nents, enum dma_data_direction dir)
{
      int i;

      for (i = 0; i < nents; i++) {
#if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
            dma_cache_sync(dev, sg_virt(&sg[i]), sg[i].length, dir);
#endif
            sg[i].dma_address = sg_phys(&sg[i]);
      }

      return nents;
}

#define dma_unmap_sg(dev, sg, nents, dir) do { } while (0)

static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
                              unsigned long offset, size_t size,
                              enum dma_data_direction dir)
{
      return dma_map_single(dev, page_address(page) + offset, size, dir);
}

static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
                          size_t size, enum dma_data_direction dir)
{
      dma_unmap_single(dev, dma_address, size, dir);
}

static inline void dma_sync_single(struct device *dev, dma_addr_t dma_handle,
                           size_t size, enum dma_data_direction dir)
{
#if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
      if (dev->bus == &pci_bus_type)
            return;
#endif
      dma_cache_sync(dev, phys_to_virt(dma_handle), size, dir);
}

static inline void dma_sync_single_range(struct device *dev,
                               dma_addr_t dma_handle,
                               unsigned long offset, size_t size,
                               enum dma_data_direction dir)
{
#if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
      if (dev->bus == &pci_bus_type)
            return;
#endif
      dma_cache_sync(dev, phys_to_virt(dma_handle) + offset, size, dir);
}

static inline void dma_sync_sg(struct device *dev, struct scatterlist *sg,
                         int nelems, enum dma_data_direction dir)
{
      int i;

      for (i = 0; i < nelems; i++) {
#if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
            dma_cache_sync(dev, sg_virt(&sg[i]), sg[i].length, dir);
#endif
            sg[i].dma_address = sg_phys(&sg[i]);
      }
}

static inline void dma_sync_single_for_cpu(struct device *dev,
                                 dma_addr_t dma_handle, size_t size,
                                 enum dma_data_direction dir)
{
      dma_sync_single(dev, dma_handle, size, dir);
}

static inline void dma_sync_single_for_device(struct device *dev,
                                    dma_addr_t dma_handle,
                                    size_t size,
                                    enum dma_data_direction dir)
{
      dma_sync_single(dev, dma_handle, size, dir);
}

static inline void dma_sync_single_range_for_cpu(struct device *dev,
                                     dma_addr_t dma_handle,
                                     unsigned long offset,
                                     size_t size,
                                     enum dma_data_direction direction)
{
      dma_sync_single_for_cpu(dev, dma_handle+offset, size, direction);
}

static inline void dma_sync_single_range_for_device(struct device *dev,
                                        dma_addr_t dma_handle,
                                        unsigned long offset,
                                        size_t size,
                                        enum dma_data_direction direction)
{
      dma_sync_single_for_device(dev, dma_handle+offset, size, direction);
}


static inline void dma_sync_sg_for_cpu(struct device *dev,
                               struct scatterlist *sg, int nelems,
                               enum dma_data_direction dir)
{
      dma_sync_sg(dev, sg, nelems, dir);
}

static inline void dma_sync_sg_for_device(struct device *dev,
                                struct scatterlist *sg, int nelems,
                                enum dma_data_direction dir)
{
      dma_sync_sg(dev, sg, nelems, dir);
}


static inline int dma_get_cache_alignment(void)
{
      /*
       * Each processor family will define its own L1_CACHE_SHIFT,
       * L1_CACHE_BYTES wraps to this, so this is always safe.
       */
      return L1_CACHE_BYTES;
}

static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
      return dma_addr == 0;
}

#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY

extern int
dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
                      dma_addr_t device_addr, size_t size, int flags);

extern void
dma_release_declared_memory(struct device *dev);

extern void *
dma_mark_declared_memory_occupied(struct device *dev,
                          dma_addr_t device_addr, size_t size);

#endif /* __ASM_SH_DMA_MAPPING_H */

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