2549edd353
There is necessary to do some cache handling for dma operations. Signed-off-by: Michal Simek <monstr@monstr.eu>
153 lines
3.9 KiB
C
153 lines
3.9 KiB
C
/*
|
|
* Implements the generic device dma API for microblaze and the pci
|
|
*
|
|
* Copyright (C) 2009-2010 Michal Simek <monstr@monstr.eu>
|
|
* Copyright (C) 2009-2010 PetaLogix
|
|
*
|
|
* 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.
|
|
*
|
|
* This file is base on powerpc and x86 dma-mapping.h versions
|
|
* Copyright (C) 2004 IBM
|
|
*/
|
|
|
|
#ifndef _ASM_MICROBLAZE_DMA_MAPPING_H
|
|
#define _ASM_MICROBLAZE_DMA_MAPPING_H
|
|
|
|
/*
|
|
* See Documentation/PCI/PCI-DMA-mapping.txt and
|
|
* Documentation/DMA-API.txt for documentation.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/dma-debug.h>
|
|
#include <linux/dma-attrs.h>
|
|
#include <asm/io.h>
|
|
#include <asm-generic/dma-coherent.h>
|
|
|
|
#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
|
|
|
|
#define __dma_alloc_coherent(dev, gfp, size, handle) NULL
|
|
#define __dma_free_coherent(size, addr) ((void)0)
|
|
#define __dma_sync(addr, size, rw) ((void)0)
|
|
|
|
static inline unsigned long device_to_mask(struct device *dev)
|
|
{
|
|
if (dev->dma_mask && *dev->dma_mask)
|
|
return *dev->dma_mask;
|
|
/* Assume devices without mask can take 32 bit addresses */
|
|
return 0xfffffffful;
|
|
}
|
|
|
|
extern struct dma_map_ops *dma_ops;
|
|
|
|
/*
|
|
* Available generic sets of operations
|
|
*/
|
|
extern struct dma_map_ops dma_direct_ops;
|
|
|
|
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
|
|
{
|
|
/* We don't handle the NULL dev case for ISA for now. We could
|
|
* do it via an out of line call but it is not needed for now. The
|
|
* only ISA DMA device we support is the floppy and we have a hack
|
|
* in the floppy driver directly to get a device for us.
|
|
*/
|
|
if (unlikely(!dev) || !dev->archdata.dma_ops)
|
|
return NULL;
|
|
|
|
return dev->archdata.dma_ops;
|
|
}
|
|
|
|
static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
|
|
{
|
|
dev->archdata.dma_ops = ops;
|
|
}
|
|
|
|
static inline int dma_supported(struct device *dev, u64 mask)
|
|
{
|
|
struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
if (unlikely(!ops))
|
|
return 0;
|
|
if (!ops->dma_supported)
|
|
return 1;
|
|
return ops->dma_supported(dev, mask);
|
|
}
|
|
|
|
#ifdef CONFIG_PCI
|
|
/* We have our own implementation of pci_set_dma_mask() */
|
|
#define HAVE_ARCH_PCI_SET_DMA_MASK
|
|
|
|
#endif
|
|
|
|
static inline int dma_set_mask(struct device *dev, u64 dma_mask)
|
|
{
|
|
struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
if (unlikely(ops == NULL))
|
|
return -EIO;
|
|
if (ops->set_dma_mask)
|
|
return ops->set_dma_mask(dev, dma_mask);
|
|
if (!dev->dma_mask || !dma_supported(dev, dma_mask))
|
|
return -EIO;
|
|
*dev->dma_mask = dma_mask;
|
|
return 0;
|
|
}
|
|
|
|
#include <asm-generic/dma-mapping-common.h>
|
|
|
|
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
|
|
{
|
|
struct dma_map_ops *ops = get_dma_ops(dev);
|
|
if (ops->mapping_error)
|
|
return ops->mapping_error(dev, dma_addr);
|
|
|
|
return (dma_addr == DMA_ERROR_CODE);
|
|
}
|
|
|
|
#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 void *dma_alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flag)
|
|
{
|
|
struct dma_map_ops *ops = get_dma_ops(dev);
|
|
void *memory;
|
|
|
|
BUG_ON(!ops);
|
|
|
|
memory = ops->alloc_coherent(dev, size, dma_handle, flag);
|
|
|
|
debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
|
|
return memory;
|
|
}
|
|
|
|
static inline void dma_free_coherent(struct device *dev, size_t size,
|
|
void *cpu_addr, dma_addr_t dma_handle)
|
|
{
|
|
struct dma_map_ops *ops = get_dma_ops(dev);
|
|
|
|
BUG_ON(!ops);
|
|
debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
|
|
ops->free_coherent(dev, size, cpu_addr, dma_handle);
|
|
}
|
|
|
|
static inline int dma_get_cache_alignment(void)
|
|
{
|
|
return L1_CACHE_BYTES;
|
|
}
|
|
|
|
static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
BUG_ON(direction == DMA_NONE);
|
|
__dma_sync(vaddr, size, (int)direction);
|
|
}
|
|
|
|
#endif /* _ASM_MICROBLAZE_DMA_MAPPING_H */
|