xref: /linux/drivers/iommu/omap-iopgtable.h (revision ead5d1f4d877e92c051e1a1ade623d0d30e71619)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * omap iommu: pagetable definitions
4  *
5  * Copyright (C) 2008-2010 Nokia Corporation
6  *
7  * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
8  */
9 
10 #ifndef _OMAP_IOPGTABLE_H
11 #define _OMAP_IOPGTABLE_H
12 
13 #include <linux/bitops.h>
14 
15 /*
16  * "L2 table" address mask and size definitions.
17  */
18 #define IOPGD_SHIFT		20
19 #define IOPGD_SIZE		BIT(IOPGD_SHIFT)
20 #define IOPGD_MASK		(~(IOPGD_SIZE - 1))
21 
22 /*
23  * "section" address mask and size definitions.
24  */
25 #define IOSECTION_SHIFT		20
26 #define IOSECTION_SIZE		BIT(IOSECTION_SHIFT)
27 #define IOSECTION_MASK		(~(IOSECTION_SIZE - 1))
28 
29 /*
30  * "supersection" address mask and size definitions.
31  */
32 #define IOSUPER_SHIFT		24
33 #define IOSUPER_SIZE		BIT(IOSUPER_SHIFT)
34 #define IOSUPER_MASK		(~(IOSUPER_SIZE - 1))
35 
36 #define PTRS_PER_IOPGD		(1UL << (32 - IOPGD_SHIFT))
37 #define IOPGD_TABLE_SIZE	(PTRS_PER_IOPGD * sizeof(u32))
38 
39 /*
40  * "small page" address mask and size definitions.
41  */
42 #define IOPTE_SHIFT		12
43 #define IOPTE_SIZE		BIT(IOPTE_SHIFT)
44 #define IOPTE_MASK		(~(IOPTE_SIZE - 1))
45 
46 /*
47  * "large page" address mask and size definitions.
48  */
49 #define IOLARGE_SHIFT		16
50 #define IOLARGE_SIZE		BIT(IOLARGE_SHIFT)
51 #define IOLARGE_MASK		(~(IOLARGE_SIZE - 1))
52 
53 #define PTRS_PER_IOPTE		(1UL << (IOPGD_SHIFT - IOPTE_SHIFT))
54 #define IOPTE_TABLE_SIZE	(PTRS_PER_IOPTE * sizeof(u32))
55 
56 #define IOPAGE_MASK		IOPTE_MASK
57 
58 /**
59  * omap_iommu_translate() - va to pa translation
60  * @d:		omap iommu descriptor
61  * @va:		virtual address
62  * @mask:	omap iommu descriptor mask
63  *
64  * va to pa translation
65  */
omap_iommu_translate(unsigned long d,dma_addr_t va,dma_addr_t mask)66 static inline phys_addr_t omap_iommu_translate(unsigned long d, dma_addr_t va,
67 					       dma_addr_t mask)
68 {
69 	return (d & mask) | (va & (~mask));
70 }
71 
72 /*
73  * some descriptor attributes.
74  */
75 #define IOPGD_TABLE		(1)
76 #define IOPGD_SECTION		(2)
77 #define IOPGD_SUPER		(BIT(18) | IOPGD_SECTION)
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)
84 #define IOPTE_LARGE		(1)
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 #endif /* _OMAP_IOPGTABLE_H */
101