arch/arm/plat-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 __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  * some descriptor attributes.
  61  */
  62 #define IOPGD_TABLE             (1 << 0)
  63 #define IOPGD_SECTION           (2 << 0)
  64 #define IOPGD_SUPER             (1 << 18 | 2 << 0)
  65
  66 #define iopgd_is_table(x)       (((x) & 3) == IOPGD_TABLE)
  67
  68 #define IOPTE_SMALL             (2 << 0)
  69 #define IOPTE_LARGE             (1 << 0)
  70
  71 /* to find an entry in a page-table-directory */
  72 #define iopgd_index(da)         (((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1))
  73 #define iopgd_offset(obj, da)   ((obj)->iopgd + iopgd_index(da))
  74
  75 #define iopgd_page_paddr(iopgd) (*iopgd & ~((1 << 10) - 1))
  76 #define iopgd_page_vaddr(iopgd) ((u32 *)phys_to_virt(iopgd_page_paddr(iopgd)))
  77
  78 /* to find an entry in the second-level page table. */
  79 #define iopte_index(da)         (((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1))
  80 #define iopte_offset(iopgd, da) (iopgd_page_vaddr(iopgd) + iopte_index(da))
  81
  82 static inline u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa,
  83                                    u32 flags)
  84 {
  85         memset(e, 0, sizeof(*e));
  86
  87         e->da           = da;
  88         e->pa           = pa;
  89         e->valid        = 1;
  90         /* FIXME: add OMAP1 support */
  91         e->pgsz         = flags & MMU_CAM_PGSZ_MASK;
  92         e->endian       = flags & MMU_RAM_ENDIAN_MASK;
  93         e->elsz         = flags & MMU_RAM_ELSZ_MASK;
  94         e->mixed        = flags & MMU_RAM_MIXED_MASK;
  95
  96         return iopgsz_to_bytes(e->pgsz);
  97 }
  98
  99 #define to_iommu(dev)                                                   \
 100         (struct iommu *)platform_get_drvdata(to_platform_device(dev))
 101
 102 #endif /* __PLAT_OMAP_IOMMU_H */