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 */
64static 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))
96