|
|
|
/* DMA mapping routines for the MN10300 arch
|
|
|
|
*
|
|
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU General Public Licence
|
|
|
|
* as published by the Free Software Foundation; either version
|
|
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
|
|
*/
|
|
|
|
#ifndef _ASM_DMA_MAPPING_H
|
|
|
|
#define _ASM_DMA_MAPPING_H
|
|
|
|
|
|
|
|
#include <linux/mm.h>
|
|
|
|
#include <linux/scatterlist.h>
|
|
|
|
|
|
|
|
#include <asm/cache.h>
|
|
|
|
#include <asm/io.h>
|
|
|
|
|
|
|
|
/*
|
|
|
|
* See Documentation/DMA-API.txt for the description of how the
|
|
|
|
* following DMA API should work.
|
|
|
|
*/
|
|
|
|
|
|
|
|
extern void *dma_alloc_coherent(struct device *dev, size_t size,
|
|
|
|
dma_addr_t *dma_handle, int flag);
|
|
|
|
|
|
|
|
extern void dma_free_coherent(struct device *dev, size_t size,
|
|
|
|
void *vaddr, dma_addr_t dma_handle);
|
|
|
|
|
|
|
|
#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))
|
|
|
|
|
|
|
|
static inline
|
|
|
|
dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
|
|
|
|
enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
mn10300_dcache_flush_inv();
|
|
|
|
return virt_to_bus(ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
|
|
|
|
enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
|
|
|
|
enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
struct scatterlist *sg;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
|
|
WARN_ON(nents == 0 || sglist[0].length == 0);
|
|
|
|
|
|
|
|
for_each_sg(sglist, sg, nents, i) {
|
|
|
|
BUG_ON(!sg_page(sg));
|
|
|
|
|
|
|
|
sg->dma_address = sg_phys(sg);
|
|
|
|
}
|
|
|
|
|
|
|
|
mn10300_dcache_flush_inv();
|
|
|
|
return nents;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
|
|
|
|
enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
BUG_ON(!valid_dma_direction(direction));
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
dma_addr_t dma_map_page(struct device *dev, struct page *page,
|
|
|
|
unsigned long offset, size_t size,
|
|
|
|
enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
return page_to_bus(page) + offset;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
|
|
|
|
enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
BUG_ON(direction == DMA_NONE);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
|
|
|
|
size_t size, enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
|
|
|
|
size_t size, enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
mn10300_dcache_flush_inv();
|
|
|
|
}
|
|
|
|
|
|
|
|
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)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
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)
|
|
|
|
{
|
|
|
|
mn10300_dcache_flush_inv();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static inline
|
|
|
|
void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
|
|
|
|
int nelems, enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
|
|
|
|
int nelems, enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
mn10300_dcache_flush_inv();
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
int dma_supported(struct device *dev, u64 mask)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* we fall back to GFP_DMA when the mask isn't all 1s, so we can't
|
|
|
|
* guarantee allocations that must be within a tighter range than
|
|
|
|
* GFP_DMA
|
|
|
|
*/
|
|
|
|
if (mask < 0x00ffffff)
|
|
|
|
return 0;
|
|
|
|
return 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;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
void dma_cache_sync(void *vaddr, size_t size,
|
|
|
|
enum dma_data_direction direction)
|
|
|
|
{
|
|
|
|
mn10300_dcache_flush_inv();
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|