/* Copyright (c) 2015-2016, 2018 The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only 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.
 */

#ifndef _LINUX_MSM_DMA_IOMMU_MAPPING_H
#define _LINUX_MSM_DMA_IOMMU_MAPPING_H

#include <linux/device.h>
#include <linux/dma-buf.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>

#ifdef CONFIG_QCOM_LAZY_MAPPING
struct msm_iommu_data {
	struct list_head map_list;
	struct mutex lock;
};

/*
 * This function is not taking a reference to the dma_buf here. It is expected
 * that clients hold reference to the dma_buf until they are done with mapping
 * and unmapping.
 */
int msm_dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents,
		   enum dma_data_direction dir, struct dma_buf *dma_buf,
		   unsigned long attrs);

void msm_dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sgl,
			    int nents, enum dma_data_direction dir,
			    struct dma_buf *dma_buf, unsigned long attrs);

void msm_dma_unmap_all_for_dev(struct device *dev);

/*
 * Below is private function only to be called by framework (ION) and not by
 * clients.
 */
void msm_dma_buf_freed(struct msm_iommu_data *data);

#else /*CONFIG_QCOM_LAZY_MAPPING*/

static inline int msm_dma_map_sg_attrs(struct device *dev,
			struct scatterlist *sg, int nents,
			enum dma_data_direction dir, struct dma_buf *dma_buf,
			unsigned long attrs)
{
	return -EINVAL;
}

static inline int msm_dma_map_sg_lazy(struct device *dev,
			       struct scatterlist *sg, int nents,
			       enum dma_data_direction dir,
			       struct dma_buf *dma_buf)
{
	return -EINVAL;
}

static inline int msm_dma_map_sg(struct device *dev, struct scatterlist *sg,
				  int nents, enum dma_data_direction dir,
				  struct dma_buf *dma_buf)
{
	return -EINVAL;
}

static inline void msm_dma_unmap_sg(struct device *dev,
					struct scatterlist *sgl, int nents,
					enum dma_data_direction dir,
					struct dma_buf *dma_buf)
{
}

static inline void msm_dma_unmap_sg_attrs(struct device *dev,
				struct scatterlist *sgl,
				int nents, enum dma_data_direction dir,
				struct dma_buf *dma_buf, unsigned long attrs)
{
}

static inline int msm_dma_unmap_all_for_dev(struct device *dev)
{
	return 0;
}

static inline void msm_dma_buf_freed(void *buffer) {}
#endif /*CONFIG_QCOM_LAZY_MAPPING*/

#endif