/*
* Copyright (C) 2012 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ASM_DMA_MAPPING_H
#define __ASM_DMA_MAPPING_H

#ifdef __KERNEL__

#include <linux/types.h>
#include <linux/vmalloc.h>

#include <asm-generic/dma-coherent.h>

#include <xen/xen.h>
#include <asm/xen/hypervisor.h>

#define DMA_ERROR_CODE (~(dma_addr_t)0)
extern struct dma_map_ops *dma_ops;

static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
{
if (unlikely(!dev) || !dev->archdata.dma_ops)
return dma_ops;
else
return dev->archdata.dma_ops;
}

static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
if (xen_initial_domain())
return xen_dma_ops;
else
return __generic_dma_ops(dev);
}

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

static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
return (dma_addr_t)paddr;
}

static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
{
return (phys_addr_t)dev_addr;
}

static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
{
struct dma_map_ops *ops = get_dma_ops(dev);
debug_dma_mapping_error(dev, dev_addr);
return ops->mapping_error(dev, dev_addr);
}

static inline int dma_supported(struct device *dev, u64 mask)
{
struct dma_map_ops *ops = get_dma_ops(dev);
return ops->dma_supported(dev, mask);
}

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 bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
if (!dev->dma_mask)
return 0;

return addr + size - 1 <= *dev->dma_mask;
}

static inline void dma_mark_clean(void *addr, size_t size)
{
}

#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
#define dma_free_coherent(d, s, h, f) dma_free_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 flags,
struct dma_attrs *attrs)
{
struct dma_map_ops *ops = get_dma_ops(dev);
void *vaddr;

if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
return vaddr;

vaddr = ops->alloc(dev, size, dma_handle, flags, attrs);
debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
return vaddr;
}

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

if (dma_release_from_coherent(dev, get_order(size), vaddr))
return;

debug_dma_free_coherent(dev, size, vaddr, dev_addr);
ops->free(dev, size, vaddr, dev_addr, attrs);
}

/*
* There is no dma_cache_sync() implementation, so just return NULL here.
*/
static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *handle, gfp_t flags)
{
return NULL;
}

static inline void dma_free_noncoherent(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t handle)
{
}

#endif /* __KERNEL__ */
#endif /* __ASM_DMA_MAPPING_H */