LXR linux/drivers/iommu/omap-iopgtable.h

   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#ifndef _OMAP_IOPGTABLE_H
  14#define _OMAP_IOPGTABLE_H
  15
  16#include <linux/bitops.h>
  17
  18/*
  19 * "L2 table" address mask and size definitions.
  20 */
  21#define IOPGD_SHIFT             20
  22#define IOPGD_SIZE              BIT(IOPGD_SHIFT)
  23#define IOPGD_MASK              (~(IOPGD_SIZE - 1))
  24
  25/*
  26 * "section" address mask and size definitions.
  27 */
  28#define IOSECTION_SHIFT         20
  29#define IOSECTION_SIZE          BIT(IOSECTION_SHIFT)
  30#define IOSECTION_MASK          (~(IOSECTION_SIZE - 1))
  31
  32/*
  33 * "supersection" address mask and size definitions.
  34 */
  35#define IOSUPER_SHIFT           24
  36#define IOSUPER_SIZE            BIT(IOSUPER_SHIFT)
  37#define IOSUPER_MASK            (~(IOSUPER_SIZE - 1))
  38
  39#define PTRS_PER_IOPGD          (1UL << (32 - IOPGD_SHIFT))
  40#define IOPGD_TABLE_SIZE        (PTRS_PER_IOPGD * sizeof(u32))
  41
  42/*
  43 * "small page" address mask and size definitions.
  44 */
  45#define IOPTE_SHIFT             12
  46#define IOPTE_SIZE              BIT(IOPTE_SHIFT)
  47#define IOPTE_MASK              (~(IOPTE_SIZE - 1))
  48
  49/*
  50 * "large page" address mask and size definitions.
  51 */
  52#define IOLARGE_SHIFT           16
  53#define IOLARGE_SIZE            BIT(IOLARGE_SHIFT)
  54#define IOLARGE_MASK            (~(IOLARGE_SIZE - 1))
  55
  56#define PTRS_PER_IOPTE          (1UL << (IOPGD_SHIFT - IOPTE_SHIFT))
  57#define IOPTE_TABLE_SIZE        (PTRS_PER_IOPTE * sizeof(u32))
  58
  59#define IOPAGE_MASK             IOPTE_MASK
  60
  61/**
  62 * omap_iommu_translate() - va to pa translation
  63 * @d:          omap iommu descriptor
  64 * @va:         virtual address
  65 * @mask:       omap iommu descriptor mask
  66 *
  67 * va to pa translation
  68 */
  69static inline phys_addr_t omap_iommu_translate(u32 d, u32 va, u32 mask)
  70{
  71        return (d & mask) | (va & (~mask));
  72}
  73
  74/*
  75 * some descriptor attributes.
  76 */
  77#define IOPGD_TABLE             (1)
  78#define IOPGD_SECTION           (2)
  79#define IOPGD_SUPER             (BIT(18) | IOPGD_SECTION)
  80
  81#define iopgd_is_table(x)       (((x) & 3) == IOPGD_TABLE)
  82#define iopgd_is_section(x)     (((x) & (1 << 18 | 3)) == IOPGD_SECTION)
  83#define iopgd_is_super(x)       (((x) & (1 << 18 | 3)) == IOPGD_SUPER)
  84
  85#define IOPTE_SMALL             (2)
  86#define IOPTE_LARGE             (1)
  87
  88#define iopte_is_small(x)       (((x) & 2) == IOPTE_SMALL)
  89#define iopte_is_large(x)       (((x) & 3) == IOPTE_LARGE)
  90
  91/* to find an entry in a page-table-directory */
  92#define iopgd_index(da)         (((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1))
  93#define iopgd_offset(obj, da)   ((obj)->iopgd + iopgd_index(da))
  94
  95#define iopgd_page_paddr(iopgd) (*iopgd & ~((1 << 10) - 1))
  96#define iopgd_page_vaddr(iopgd) ((u32 *)phys_to_virt(iopgd_page_paddr(iopgd)))
  97
  98/* to find an entry in the second-level page table. */
  99#define iopte_index(da)         (((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1))
 100#define iopte_offset(iopgd, da) (iopgd_page_vaddr(iopgd) + iopte_index(da))
 101
 102#endif /* _OMAP_IOPGTABLE_H */
 103