2 * omap iommu: pagetable definitions
4 * Copyright (C) 2008-2010 Nokia Corporation
6 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
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.
13 #ifndef _OMAP_IOPGTABLE_H
14 #define _OMAP_IOPGTABLE_H
16 #include <linux/bitops.h>
19 * "L2 table" address mask and size definitions.
21 #define IOPGD_SHIFT 20
22 #define IOPGD_SIZE BIT(IOPGD_SHIFT)
23 #define IOPGD_MASK (~(IOPGD_SIZE - 1))
26 * "section" address mask and size definitions.
28 #define IOSECTION_SHIFT 20
29 #define IOSECTION_SIZE BIT(IOSECTION_SHIFT)
30 #define IOSECTION_MASK (~(IOSECTION_SIZE - 1))
33 * "supersection" address mask and size definitions.
35 #define IOSUPER_SHIFT 24
36 #define IOSUPER_SIZE BIT(IOSUPER_SHIFT)
37 #define IOSUPER_MASK (~(IOSUPER_SIZE - 1))
39 #define PTRS_PER_IOPGD (1UL << (32 - IOPGD_SHIFT))
40 #define IOPGD_TABLE_SIZE (PTRS_PER_IOPGD * sizeof(u32))
43 * "small page" address mask and size definitions.
45 #define IOPTE_SHIFT 12
46 #define IOPTE_SIZE BIT(IOPTE_SHIFT)
47 #define IOPTE_MASK (~(IOPTE_SIZE - 1))
50 * "large page" address mask and size definitions.
52 #define IOLARGE_SHIFT 16
53 #define IOLARGE_SIZE BIT(IOLARGE_SHIFT)
54 #define IOLARGE_MASK (~(IOLARGE_SIZE - 1))
56 #define PTRS_PER_IOPTE (1UL << (IOPGD_SHIFT - IOPTE_SHIFT))
57 #define IOPTE_TABLE_SIZE (PTRS_PER_IOPTE * sizeof(u32))
59 #define IOPAGE_MASK IOPTE_MASK
62 * omap_iommu_translate() - va to pa translation
63 * @d: omap iommu descriptor
64 * @va: virtual address
65 * @mask: omap iommu descriptor mask
67 * va to pa translation
69 static inline phys_addr_t omap_iommu_translate(u32 d, u32 va, u32 mask)
71 return (d & mask) | (va & (~mask));
75 * some descriptor attributes.
77 #define IOPGD_TABLE (1)
78 #define IOPGD_SECTION (2)
79 #define IOPGD_SUPER (BIT(18) | IOPGD_SECTION)
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)
85 #define IOPTE_SMALL (2)
86 #define IOPTE_LARGE (1)
88 #define iopte_is_small(x) (((x) & 2) == IOPTE_SMALL)
89 #define iopte_is_large(x) (((x) & 3) == IOPTE_LARGE)
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))
95 #define iopgd_page_paddr(iopgd) (*iopgd & ~((1 << 10) - 1))
96 #define iopgd_page_vaddr(iopgd) ((u32 *)phys_to_virt(iopgd_page_paddr(iopgd)))
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))
102 #endif /* _OMAP_IOPGTABLE_H */