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
iotlb_init_entry(struct iotlb_entry * e,u32 da,u32 pa,u32 flags)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 */
103