path: root/target/linux/realtek/files/arch/rlx/mm/dma-default.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2000  Ani Joshi <ajoshi@unixbox.com>
 * Copyright (C) 2000, 2001, 06  Ralf Baechle <ralf@linux-mips.org>
 * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
 */

#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/string.h>

#include <asm/cache.h>
#include <asm/io.h>

#include <dma-coherence.h>

static inline unsigned long dma_addr_to_virt(dma_addr_t dma_addr)
{
  unsigned long addr = plat_dma_addr_to_phys(dma_addr);

  return (unsigned long)phys_to_virt(addr);
}

/*
 * Warning on the terminology - Linux calls an uncached area coherent;
 * MIPS terminology calls memory areas with hardware maintained coherency
 * coherent.
 */

static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
{
  /* ignore region specifiers */
  gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);

#ifdef CONFIG_ZONE_DMA
  if (dev == NULL)
    gfp |= __GFP_DMA;
  else if (dev->coherent_dma_mask < DMA_BIT_MASK(24))
    gfp |= __GFP_DMA;
  else
    ;
#endif
#ifdef CONFIG_ZONE_DMA32
  if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
    gfp |= __GFP_DMA32;
  else
    ;
#endif

  /* Don't invoke OOM killer */
  gfp |= __GFP_NORETRY;

  return gfp;
}

void *dma_alloc_noncoherent(struct device *dev, size_t size,
	dma_addr_t * dma_handle, gfp_t gfp)
{
	void *ret;

	gfp = massage_gfp_flags(dev, gfp);

	ret = (void *) __get_free_pages(gfp, get_order(size));

	if (ret != NULL) {
		memset(ret, 0, size);
		*dma_handle = plat_map_dma_mem(dev, ret, size);
	}

	return ret;
}

EXPORT_SYMBOL(dma_alloc_noncoherent);

void *dma_alloc_coherent(struct device *dev, size_t size,
	dma_addr_t * dma_handle, gfp_t gfp)
{
  void *ret;

  gfp = massage_gfp_flags(dev, gfp);

  ret = (void *) __get_free_pages(gfp, get_order(size));

  if (ret)
    {
      memset(ret, 0, size);
      *dma_handle = plat_map_dma_mem(dev, ret, size);

      dma_cache_wback_inv((unsigned long) ret, size);
      ret = UNCAC_ADDR(ret);
    }

  return ret;
}

EXPORT_SYMBOL(dma_alloc_coherent);

void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
	dma_addr_t dma_handle)
{
	plat_unmap_dma_mem(dev, dma_handle);
	free_pages((unsigned long) vaddr, get_order(size));
}

EXPORT_SYMBOL(dma_free_noncoherent);

void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
	dma_addr_t dma_handle)
{
	unsigned long addr = (unsigned long) vaddr;

	plat_unmap_dma_mem(dev, dma_handle);
    addr = CAC_ADDR(addr);

	free_pages(addr, get_order(size));
}

EXPORT_SYMBOL(dma_free_coherent);

static inline void __dma_sync(unsigned long addr, size_t size,
	enum dma_data_direction direction)
{
	switch (direction) {
	case DMA_TO_DEVICE:
		dma_cache_wback(addr, size);
		break;

	case DMA_FROM_DEVICE:
		dma_cache_inv(addr, size);
		break;

	case DMA_BIDIRECTIONAL:
		dma_cache_wback_inv(addr, size);
		break;

	default:
		BUG();
	}
}

dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
	enum dma_data_direction direction)
{
	unsigned long addr = (unsigned long) ptr;

    __dma_sync(addr, size, direction);

	return plat_map_dma_mem(dev, ptr, size);
}

EXPORT_SYMBOL(dma_map_single);

void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
	enum dma_data_direction direction)
{
	plat_unmap_dma_mem(dev, dma_addr);
}

EXPORT_SYMBOL(dma_unmap_single);

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

  BUG_ON(direction == DMA_NONE);

  for (i = 0; i < nents; i++, sg++)
    {
      unsigned long addr;

      addr = (unsigned long) sg_virt(sg);
      if (addr)
        __dma_sync(addr, sg->length, direction);

      sg->dma_address = plat_map_dma_mem(dev, (void *)addr, sg->length);
    }

  return nents;
}

EXPORT_SYMBOL(dma_map_sg);

dma_addr_t dma_map_page(struct device *dev, struct page *page,
	unsigned long offset, size_t size, enum dma_data_direction direction)
{
  unsigned long addr;

  BUG_ON(direction == DMA_NONE);

  addr = (unsigned long) page_address(page) + offset;
  __dma_sync(addr, size, direction);

  return plat_map_dma_mem_page(dev, page) + offset;
}

EXPORT_SYMBOL(dma_map_page);

void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
	enum dma_data_direction direction)
{
  unsigned long addr;
  int i;

  BUG_ON(direction == DMA_NONE);

  for (i = 0; i < nhwentries; i++, sg++)
    {
      if (direction != DMA_TO_DEVICE)
        {
          addr = (unsigned long) sg_virt(sg);
          if (addr)
            __dma_sync(addr, sg->length, direction);
        }

      plat_unmap_dma_mem(dev, sg->dma_address);
    }
}

EXPORT_SYMBOL(dma_unmap_sg);

void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
	size_t size, enum dma_data_direction direction)
{
	BUG_ON(direction == DMA_NONE);

	#ifdef CONFIG_ARCH_CPU_RLX5281
	__asm__ __volatile__(
       ".set\tpush\n"
       ".set\tnoreorder\n"
       "\tmtc0\t$0, $20\n"
       "\tli\t$8, 0x200\n"
       "\tmtc0\t$8, $20\n"
       ".set\tpop\n");
	#endif
}

EXPORT_SYMBOL(dma_sync_single_for_cpu);

void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
	size_t size, enum dma_data_direction direction)
{
  unsigned long addr;

  BUG_ON(direction == DMA_NONE);

  plat_extra_sync_for_device(dev);
  addr = dma_addr_to_virt(dma_handle);
  __dma_sync(addr, size, direction);
}

EXPORT_SYMBOL(dma_sync_single_for_device);

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)
{
  BUG_ON(direction == DMA_NONE);
}

EXPORT_SYMBOL(dma_sync_single_range_for_cpu);

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)
{
  unsigned long addr;
  BUG_ON(direction == DMA_NONE);

  plat_extra_sync_for_device(dev);
  addr = dma_addr_to_virt(dma_handle);
  __dma_sync(addr + offset, size, direction);
}

EXPORT_SYMBOL(dma_sync_single_range_for_device);

void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
	enum dma_data_direction direction)
{
	BUG_ON(direction == DMA_NONE);
}

EXPORT_SYMBOL(dma_sync_sg_for_cpu);

void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
	enum dma_data_direction direction)
{
  int i;

  BUG_ON(direction == DMA_NONE);

  /* Make sure that gcc doesn't leave the empty loop body.  */
  for (i = 0; i < nelems; i++, sg++)
    __dma_sync((unsigned long)page_address(sg_page(sg)),
               sg->length, direction);
}

EXPORT_SYMBOL(dma_sync_sg_for_device);

int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
	return plat_dma_mapping_error(dev, dma_addr);
}

EXPORT_SYMBOL(dma_mapping_error);

int dma_supported(struct device *dev, u64 mask)
{
	return plat_dma_supported(dev, mask);
}

EXPORT_SYMBOL(dma_supported);

int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
{
	return 0;
}

EXPORT_SYMBOL(dma_is_consistent);

void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
	       enum dma_data_direction direction)
{
  BUG_ON(direction == DMA_NONE);

  plat_extra_sync_for_device(dev);
  __dma_sync((unsigned long)vaddr, size, direction);
}

EXPORT_SYMBOL(dma_cache_sync);