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  */
  69 static 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 */