arch/arm/plat-omap/include/plat/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 __PLAT_OMAP_IOMMU_H
  14 #define __PLAT_OMAP_IOMMU_H
  15
  16 /*
  17  * "L2 table" address mask and size definitions.
  18  */
  19 #define IOPGD_SHIFT             20
  20 #define IOPGD_SIZE              (1UL << IOPGD_SHIFT)
  21 #define IOPGD_MASK              (~(IOPGD_SIZE - 1))
  22
  23 /*
  24  * "section" address mask and size definitions.
  25  */
  26 #define IOSECTION_SHIFT         20
  27 #define IOSECTION_SIZE          (1UL << IOSECTION_SHIFT)
  28 #define IOSECTION_MASK          (~(IOSECTION_SIZE - 1))
  29
  30 /*
  31  * "supersection" address mask and size definitions.
  32  */
  33 #define IOSUPER_SHIFT           24
  34 #define IOSUPER_SIZE            (1UL << IOSUPER_SHIFT)
  35 #define IOSUPER_MASK            (~(IOSUPER_SIZE - 1))
  36
  37 #define PTRS_PER_IOPGD          (1UL << (32 - IOPGD_SHIFT))
  38 #define IOPGD_TABLE_SIZE        (PTRS_PER_IOPGD * sizeof(u32))
  39
  40 /*
  41  * "small page" address mask and size definitions.
  42  */
  43 #define IOPTE_SHIFT             12
  44 #define IOPTE_SIZE              (1UL << IOPTE_SHIFT)
  45 #define IOPTE_MASK              (~(IOPTE_SIZE - 1))
  46
  47 /*
  48  * "large page" address mask and size definitions.
  49  */
  50 #define IOLARGE_SHIFT           16
  51 #define IOLARGE_SIZE            (1UL << IOLARGE_SHIFT)
  52 #define IOLARGE_MASK            (~(IOLARGE_SIZE - 1))
  53
  54 #define PTRS_PER_IOPTE          (1UL << (IOPGD_SHIFT - IOPTE_SHIFT))
  55 #define IOPTE_TABLE_SIZE        (PTRS_PER_IOPTE * sizeof(u32))
  56
  57 #define IOPAGE_MASK             IOPTE_MASK
  58
  59 /**
  60  * omap_iommu_translate() - va to pa translation
  61  * @d:          omap iommu descriptor
  62  * @va:         virtual address
  63  * @mask:       omap iommu descriptor mask
  64  *
  65  * va to pa translation
  66  */
  67 static inline phys_addr_t omap_iommu_translate(u32 d, u32 va, u32 mask)
  68 {
  69         return (d & mask) | (va & (~mask));
  70 }
  71
  72 /*
  73  * some descriptor attributes.
  74  */
  75 #define IOPGD_TABLE             (1 << 0)
  76 #define IOPGD_SECTION           (2 << 0)
  77 #define IOPGD_SUPER             (1 << 18 | 2 << 0)
  78
  79 #define iopgd_is_table(x)       (((x) & 3) == IOPGD_TABLE)
  80 #define iopgd_is_section(x)     (((x) & (1 << 18 | 3)) == IOPGD_SECTION)
  81 #define iopgd_is_super(x)       (((x) & (1 << 18 | 3)) == IOPGD_SUPER)
  82
  83 #define IOPTE_SMALL             (2 << 0)
  84 #define IOPTE_LARGE             (1 << 0)
  85
  86 #define iopte_is_small(x)       (((x) & 2) == IOPTE_SMALL)
  87 #define iopte_is_large(x)       (((x) & 3) == IOPTE_LARGE)
  88
  89 /* to find an entry in a page-table-directory */
  90 #define iopgd_index(da)         (((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1))
  91 #define iopgd_offset(obj, da)   ((obj)->iopgd + iopgd_index(da))
  92
  93 #define iopgd_page_paddr(iopgd) (*iopgd & ~((1 << 10) - 1))
  94 #define iopgd_page_vaddr(iopgd) ((u32 *)phys_to_virt(iopgd_page_paddr(iopgd)))
  95
  96 /* to find an entry in the second-level page table. */
  97 #define iopte_index(da)         (((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1))
  98 #define iopte_offset(iopgd, da) (iopgd_page_vaddr(iopgd) + iopte_index(da))
  99
 100 static inline u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa,
 101                                    u32 flags)
 102 {
 103         memset(e, 0, sizeof(*e));
 104
 105         e->da           = da;
 106         e->pa           = pa;
 107         e->valid        = 1;
 108         /* FIXME: add OMAP1 support */
 109         e->pgsz         = flags & MMU_CAM_PGSZ_MASK;
 110         e->endian       = flags & MMU_RAM_ENDIAN_MASK;
 111         e->elsz         = flags & MMU_RAM_ELSZ_MASK;
 112         e->mixed        = flags & MMU_RAM_MIXED_MASK;
 113
 114         return iopgsz_to_bytes(e->pgsz);
 115 }
 116
 117 #define to_iommu(dev)                                                   \
 118         (struct omap_iommu *)platform_get_drvdata(to_platform_device(dev))
 119
 120 #endif /* __PLAT_OMAP_IOMMU_H */