linux/drivers/iommu/omap-iopgtable.h
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   1/*
   2 * omap iommu: pagetable definitions
   3 *
   4 * Copyright (C) 2008-2010 Nokia Corporation
   5 *
   6 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13/*
  14 * "L2 table" address mask and size definitions.
  15 */
  16#define IOPGD_SHIFT             20
  17#define IOPGD_SIZE              (1UL << IOPGD_SHIFT)
  18#define IOPGD_MASK              (~(IOPGD_SIZE - 1))
  19
  20/*
  21 * "section" address mask and size definitions.
  22 */
  23#define IOSECTION_SHIFT         20
  24#define IOSECTION_SIZE          (1UL << IOSECTION_SHIFT)
  25#define IOSECTION_MASK          (~(IOSECTION_SIZE - 1))
  26
  27/*
  28 * "supersection" address mask and size definitions.
  29 */
  30#define IOSUPER_SHIFT           24
  31#define IOSUPER_SIZE            (1UL << IOSUPER_SHIFT)
  32#define IOSUPER_MASK            (~(IOSUPER_SIZE - 1))
  33
  34#define PTRS_PER_IOPGD          (1UL << (32 - IOPGD_SHIFT))
  35#define IOPGD_TABLE_SIZE        (PTRS_PER_IOPGD * sizeof(u32))
  36
  37/*
  38 * "small page" address mask and size definitions.
  39 */
  40#define IOPTE_SHIFT             12
  41#define IOPTE_SIZE              (1UL << IOPTE_SHIFT)
  42#define IOPTE_MASK              (~(IOPTE_SIZE - 1))
  43
  44/*
  45 * "large page" address mask and size definitions.
  46 */
  47#define IOLARGE_SHIFT           16
  48#define IOLARGE_SIZE            (1UL << IOLARGE_SHIFT)
  49#define IOLARGE_MASK            (~(IOLARGE_SIZE - 1))
  50
  51#define PTRS_PER_IOPTE          (1UL << (IOPGD_SHIFT - IOPTE_SHIFT))
  52#define IOPTE_TABLE_SIZE        (PTRS_PER_IOPTE * sizeof(u32))
  53
  54#define IOPAGE_MASK             IOPTE_MASK
  55
  56/**
  57 * omap_iommu_translate() - va to pa translation
  58 * @d:          omap iommu descriptor
  59 * @va:         virtual address
  60 * @mask:       omap iommu descriptor mask
  61 *
  62 * va to pa translation
  63 */
  64static inline phys_addr_t omap_iommu_translate(u32 d, u32 va, u32 mask)
  65{
  66        return (d & mask) | (va & (~mask));
  67}
  68
  69/*
  70 * some descriptor attributes.
  71 */
  72#define IOPGD_TABLE             (1 << 0)
  73#define IOPGD_SECTION           (2 << 0)
  74#define IOPGD_SUPER             (1 << 18 | 2 << 0)
  75
  76#define iopgd_is_table(x)       (((x) & 3) == IOPGD_TABLE)
  77#define iopgd_is_section(x)     (((x) & (1 << 18 | 3)) == IOPGD_SECTION)
  78#define iopgd_is_super(x)       (((x) & (1 << 18 | 3)) == IOPGD_SUPER)
  79
  80#define IOPTE_SMALL             (2 << 0)
  81#define IOPTE_LARGE             (1 << 0)
  82
  83#define iopte_is_small(x)       (((x) & 2) == IOPTE_SMALL)
  84#define iopte_is_large(x)       (((x) & 3) == IOPTE_LARGE)
  85
  86/* to find an entry in a page-table-directory */
  87#define iopgd_index(da)         (((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1))
  88#define iopgd_offset(obj, da)   ((obj)->iopgd + iopgd_index(da))
  89
  90#define iopgd_page_paddr(iopgd) (*iopgd & ~((1 << 10) - 1))
  91#define iopgd_page_vaddr(iopgd) ((u32 *)phys_to_virt(iopgd_page_paddr(iopgd)))
  92
  93/* to find an entry in the second-level page table. */
  94#define iopte_index(da)         (((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1))
  95#define iopte_offset(iopgd, da) (iopgd_page_vaddr(iopgd) + iopte_index(da))
  96
  97#define to_iommu(dev)                                                   \
  98        (struct omap_iommu *)platform_get_drvdata(to_platform_device(dev))
  99
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