iovmm.h

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/*
 * omap iommu: simple virtual address space management
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Written by Hiroshi DOYU <[email protected]>
 *
 * 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.
 */

#ifndef __IOMMU_MMAP_H
#define __IOMMU_MMAP_H

#include <linux/iommu.h>

struct iovm_struct {
    struct omap_iommu   *iommu; /* iommu object which this belongs to */
    u32         da_start; /* area definition */
    u32         da_end;
    u32         flags; /* IOVMF_: see below */
    struct list_head    list; /* linked in ascending order */
    const struct sg_table   *sgt; /* keep 'page' <-> 'da' mapping */
    void            *va; /* mpu side mapped address */
};

/*
 * IOVMF_FLAGS: attribute for iommu virtual memory area(iovma)
 *
 * lower 16 bit is used for h/w and upper 16 bit is for s/w.
 */
#define IOVMF_SW_SHIFT      16

/*
 * iovma: h/w flags derived from cam and ram attribute
 */
#define IOVMF_CAM_MASK      (~((1 << 10) - 1))
#define IOVMF_RAM_MASK      (~IOVMF_CAM_MASK)

#define IOVMF_PGSZ_MASK     (3 << 0)
#define IOVMF_PGSZ_1M       MMU_CAM_PGSZ_1M
#define IOVMF_PGSZ_64K      MMU_CAM_PGSZ_64K
#define IOVMF_PGSZ_4K       MMU_CAM_PGSZ_4K
#define IOVMF_PGSZ_16M      MMU_CAM_PGSZ_16M

#define IOVMF_ENDIAN_MASK   (1 << 9)
#define IOVMF_ENDIAN_BIG    MMU_RAM_ENDIAN_BIG
#define IOVMF_ENDIAN_LITTLE MMU_RAM_ENDIAN_LITTLE

#define IOVMF_ELSZ_MASK     (3 << 7)
#define IOVMF_ELSZ_8        MMU_RAM_ELSZ_8
#define IOVMF_ELSZ_16       MMU_RAM_ELSZ_16
#define IOVMF_ELSZ_32       MMU_RAM_ELSZ_32
#define IOVMF_ELSZ_NONE     MMU_RAM_ELSZ_NONE

#define IOVMF_MIXED_MASK    (1 << 6)
#define IOVMF_MIXED     MMU_RAM_MIXED

/*
 * iovma: s/w flags, used for mapping and umapping internally.
 */
#define IOVMF_MMIO      (1 << IOVMF_SW_SHIFT)
#define IOVMF_ALLOC     (2 << IOVMF_SW_SHIFT)
#define IOVMF_ALLOC_MASK    (3 << IOVMF_SW_SHIFT)

/* "superpages" is supported just with physically linear pages */
#define IOVMF_DISCONT       (1 << (2 + IOVMF_SW_SHIFT))
#define IOVMF_LINEAR        (2 << (2 + IOVMF_SW_SHIFT))
#define IOVMF_LINEAR_MASK   (3 << (2 + IOVMF_SW_SHIFT))

#define IOVMF_DA_FIXED      (1 << (4 + IOVMF_SW_SHIFT))


extern struct iovm_struct *omap_find_iovm_area(struct device *dev, u32 da);
extern u32
omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da,
            const struct sg_table *sgt, u32 flags);
extern struct sg_table *omap_iommu_vunmap(struct iommu_domain *domain,
                struct device *dev, u32 da);
extern u32
omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev,
                u32 da, size_t bytes, u32 flags);
extern void
omap_iommu_vfree(struct iommu_domain *domain, struct device *dev,
                const u32 da);
extern void *omap_da_to_va(struct device *dev, u32 da);

#endif /* __IOMMU_MMAP_H */