iopgtable.h

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/*
 * omap iommu: pagetable definitions
 *
 * Copyright (C) 2008-2010 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 __PLAT_OMAP_IOMMU_H
#define __PLAT_OMAP_IOMMU_H

/*
 * "L2 table" address mask and size definitions.
 */
#define IOPGD_SHIFT     20
#define IOPGD_SIZE      (1UL << IOPGD_SHIFT)
#define IOPGD_MASK      (~(IOPGD_SIZE - 1))

/*
 * "section" address mask and size definitions.
 */
#define IOSECTION_SHIFT     20
#define IOSECTION_SIZE      (1UL << IOSECTION_SHIFT)
#define IOSECTION_MASK      (~(IOSECTION_SIZE - 1))

/*
 * "supersection" address mask and size definitions.
 */
#define IOSUPER_SHIFT       24
#define IOSUPER_SIZE        (1UL << IOSUPER_SHIFT)
#define IOSUPER_MASK        (~(IOSUPER_SIZE - 1))

#define PTRS_PER_IOPGD      (1UL << (32 - IOPGD_SHIFT))
#define IOPGD_TABLE_SIZE    (PTRS_PER_IOPGD * sizeof(u32))

/*
 * "small page" address mask and size definitions.
 */
#define IOPTE_SHIFT     12
#define IOPTE_SIZE      (1UL << IOPTE_SHIFT)
#define IOPTE_MASK      (~(IOPTE_SIZE - 1))

/*
 * "large page" address mask and size definitions.
 */
#define IOLARGE_SHIFT       16
#define IOLARGE_SIZE        (1UL << IOLARGE_SHIFT)
#define IOLARGE_MASK        (~(IOLARGE_SIZE - 1))

#define PTRS_PER_IOPTE      (1UL << (IOPGD_SHIFT - IOPTE_SHIFT))
#define IOPTE_TABLE_SIZE    (PTRS_PER_IOPTE * sizeof(u32))

#define IOPAGE_MASK     IOPTE_MASK

static inline phys_addr_t omap_iommu_translate(u32 d, u32 va, u32 mask)
{
    return (d & mask) | (va & (~mask));
}

/*
 * some descriptor attributes.
 */
#define IOPGD_TABLE     (1 << 0)
#define IOPGD_SECTION       (2 << 0)
#define IOPGD_SUPER     (1 << 18 | 2 << 0)

#define iopgd_is_table(x)   (((x) & 3) == IOPGD_TABLE)
#define iopgd_is_section(x) (((x) & (1 << 18 | 3)) == IOPGD_SECTION)
#define iopgd_is_super(x)   (((x) & (1 << 18 | 3)) == IOPGD_SUPER)

#define IOPTE_SMALL     (2 << 0)
#define IOPTE_LARGE     (1 << 0)

#define iopte_is_small(x)   (((x) & 2) == IOPTE_SMALL)
#define iopte_is_large(x)   (((x) & 3) == IOPTE_LARGE)

/* to find an entry in a page-table-directory */
#define iopgd_index(da)     (((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1))
#define iopgd_offset(obj, da)   ((obj)->iopgd + iopgd_index(da))

#define iopgd_page_paddr(iopgd) (*iopgd & ~((1 << 10) - 1))
#define iopgd_page_vaddr(iopgd) ((u32 *)phys_to_virt(iopgd_page_paddr(iopgd)))

/* to find an entry in the second-level page table. */
#define iopte_index(da)     (((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1))
#define iopte_offset(iopgd, da) (iopgd_page_vaddr(iopgd) + iopte_index(da))

static inline u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa,
                   u32 flags)
{
    memset(e, 0, sizeof(*e));

    e->da       = da;
    e->pa       = pa;
    e->valid    = 1;
    /* FIXME: add OMAP1 support */
    e->pgsz     = flags & MMU_CAM_PGSZ_MASK;
    e->endian   = flags & MMU_RAM_ENDIAN_MASK;
    e->elsz     = flags & MMU_RAM_ELSZ_MASK;
    e->mixed    = flags & MMU_RAM_MIXED_MASK;

    return iopgsz_to_bytes(e->pgsz);
}

#define to_iommu(dev)                           \
    (struct omap_iommu *)platform_get_drvdata(to_platform_device(dev))

#endif /* __PLAT_OMAP_IOMMU_H */