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 /*
  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  */
  64 static 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))