/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2010-2011 Jonas Bonn <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/

#ifndef __ASM_OPENRISC_DMA_MAPPING_H
#define __ASM_OPENRISC_DMA_MAPPING_H

/*
* See Documentation/DMA-API-HOWTO.txt and
* Documentation/DMA-API.txt for documentation.
*/

#include <linux/dma-debug.h>
#include <asm-generic/dma-coherent.h>
#include <linux/kmemcheck.h>
#include <linux/dma-mapping.h>

#define DMA_ERROR_CODE (~(dma_addr_t)0x0)

extern struct dma_map_ops or1k_dma_map_ops;

static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
return &or1k_dma_map_ops;
}

#include <asm-generic/dma-mapping-common.h>

#define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)

static inline void *dma_alloc_attrs(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
struct dma_attrs *attrs)
{
struct dma_map_ops *ops = get_dma_ops(dev);
void *memory;

memory = ops->alloc(dev, size, dma_handle, gfp, attrs);

debug_dma_alloc_coherent(dev, size, *dma_handle, memory);

return memory;
}

#define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)

static inline void dma_free_attrs(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t dma_handle,
struct dma_attrs *attrs)
{
struct dma_map_ops *ops = get_dma_ops(dev);

debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);

ops->free(dev, size, cpu_addr, dma_handle, attrs);
}

static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp)
{
struct dma_attrs attrs;

dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);

return dma_alloc_attrs(dev, size, dma_handle, gfp, &attrs);
}

static inline void dma_free_noncoherent(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t dma_handle)
{
struct dma_attrs attrs;

dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);

dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
}

static inline int dma_supported(struct device *dev, u64 dma_mask)
{
/* Support 32 bit DMA mask exclusively */
return dma_mask == DMA_BIT_MASK(32);
}

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

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

*dev->dma_mask = dma_mask;

return 0;
}
#endif /* __ASM_OPENRISC_DMA_MAPPING_H */