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/*
* Copyright (C) 2014 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 __DMA_IOMMU_H
#define __DMA_IOMMU_H
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/iommu.h>
#ifdef CONFIG_IOMMU_DMA
int iommu_dma_init(void);
struct iommu_dma_domain *iommu_dma_create_domain(struct bus_type *bus,
dma_addr_t base, size_t size);
void iommu_dma_release_domain(struct iommu_dma_domain *dma_domain);
struct iommu_domain *iommu_dma_raw_domain(struct iommu_dma_domain *dma_domain);
int iommu_dma_attach_device(struct device *dev, struct iommu_dma_domain *domain);
void iommu_dma_detach_device(struct device *dev);
/*
* Implementation of these is left to arch code - it can associate domains
* with devices however it likes, provided the lookup is efficient.
*/
struct iommu_dma_domain *get_dma_domain(struct device *dev);
void set_dma_domain(struct device *dev, struct iommu_dma_domain *dma_domain);
dma_addr_t iommu_dma_create_iova_mapping(struct device *dev,
struct page **pages, size_t size, bool coherent);
int iommu_dma_release_iova_mapping(struct device *dev, dma_addr_t iova,
size_t size);
struct page **iommu_dma_alloc_buffer(struct device *dev, size_t size,
gfp_t gfp, struct dma_attrs *attrs,
void (clear_buffer)(struct page *page, size_t size));
int iommu_dma_free_buffer(struct device *dev, struct page **pages, size_t size,
struct dma_attrs *attrs);
dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs);
dma_addr_t iommu_dma_coherent_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs);
void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
enum dma_data_direction dir, struct dma_attrs *attrs);
int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir, struct dma_attrs *attrs);
int iommu_dma_coherent_map_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir,
struct dma_attrs *attrs);
void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sgl, int nents,
enum dma_data_direction dir, struct dma_attrs *attrs);
int iommu_dma_init_reserved(struct device *dev, struct iommu_dma_domain *dma_domain);
int iommu_dma_supported(struct device *dev, u64 mask);
int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
#else
static inline int iommu_dma_init(void)
{
return 0;
}
static inline struct iommu_dma_domain *get_dma_domain(struct device *dev)
{
return NULL;
}
static inline void set_dma_domain(struct device *dev,
struct iommu_dma_domain *dma_domain)
{ }
#endif /* CONFIG_IOMMU_DMA */
#endif /* __KERNEL__ */
#endif /* __DMA_IOMMU_H */
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