/* SPDX-License-Identifier: GPL-2.0 */
#ifndef ASMARM_DMA_IOMMU_H
#define ASMARM_DMA_IOMMU_H

#ifdef __KERNEL__

#include <linux/mm_types.h>
#include <linux/scatterlist.h>
#include <linux/kref.h>

struct dma_iommu_mapping {
        /* iommu specific data */
        struct iommu_domain     *domain;

        unsigned long           **bitmaps;      /* array of bitmaps */
        unsigned int            nr_bitmaps;     /* nr of elements in array */
        unsigned int            extensions;
        size_t                  bitmap_size;    /* size of a single bitmap */
        size_t                  bits;           /* per bitmap */
        dma_addr_t              base;

        spinlock_t              lock;
        struct kref             kref;
};

struct dma_iommu_mapping *
arm_iommu_create_mapping(struct device *dev, dma_addr_t base, u64 size);

void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);

int arm_iommu_attach_device(struct device *dev,
                                        struct dma_iommu_mapping *mapping);
void arm_iommu_detach_device(struct device *dev);

#endif /* __KERNEL__ */
#endif