aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/plat-omap/include/mach/iommu.h
blob: 46d41ac83dbf13feb60f653563554369f0abae27 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/*
 * omap iommu: main structures
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __MACH_IOMMU_H
#define __MACH_IOMMU_H

struct iotlb_entry {
	u32 da;
	u32 pa;
	u32 pgsz, prsvd, valid;
	union {
		u16 ap;
		struct {
			u32 endian, elsz, mixed;
		};
	};
};

struct iommu {
	const char	*name;
	struct module	*owner;
	struct clk	*clk;
	void __iomem	*regbase;
	struct device	*dev;

	unsigned int	refcount;
	struct mutex	iommu_lock;	/* global for this whole object */

	/*
	 * We don't change iopgd for a situation like pgd for a task,
	 * but share it globally for each iommu.
	 */
	u32		*iopgd;
	spinlock_t	page_table_lock; /* protect iopgd */

	int		nr_tlb_entries;

	struct list_head	mmap;
	struct mutex		mmap_lock; /* protect mmap */

	int (*isr)(struct iommu *obj);

	void *ctx; /* iommu context: registres saved area */
};

struct cr_regs {
	union {
		struct {
			u16 cam_l;
			u16 cam_h;
		};
		u32 cam;
	};
	union {
		struct {
			u16 ram_l;
			u16 ram_h;
		};
		u32 ram;
	};
};

struct iotlb_lock {
	short base;
	short vict;
};

/* architecture specific functions */
struct iommu_functions {
	unsigned long	version;

	int (*enable)(struct iommu *obj);
	void (*disable)(struct iommu *obj);
	u32 (*fault_isr)(struct iommu *obj, u32 *ra);

	void (*tlb_read_cr)(struct iommu *obj, struct cr_regs *cr);
	void (*tlb_load_cr)(struct iommu *obj, struct cr_regs *cr);

	struct cr_regs *(*alloc_cr)(struct iommu *obj, struct iotlb_entry *e);
	int (*cr_valid)(struct cr_regs *cr);
	u32 (*cr_to_virt)(struct cr_regs *cr);
	void (*cr_to_e)(struct cr_regs *cr, struct iotlb_entry *e);
	ssize_t (*dump_cr)(struct iommu *obj, struct cr_regs *cr, char *buf);

	u32 (*get_pte_attr)(struct iotlb_entry *e);

	void (*save_ctx)(struct iommu *obj);
	void (*restore_ctx)(struct iommu *obj);
	ssize_t (*dump_ctx)(struct iommu *obj, char *buf, ssize_t len);
};

struct iommu_platform_data {
	const char *name;
	const char *clk_name;
	const int nr_tlb_entries;
};

#if defined(CONFIG_ARCH_OMAP1)
#error "iommu for this processor not implemented yet"
#else
#include <mach/iommu2.h>
#endif

/*
 * utilities for super page(16MB, 1MB, 64KB and 4KB)
 */

#define iopgsz_max(bytes)			\
	(((bytes) >= SZ_16M) ? SZ_16M :		\
	 ((bytes) >= SZ_1M)  ? SZ_1M  :		\
	 ((bytes) >= SZ_64K) ? SZ_64K :		\
	 ((bytes) >= SZ_4K)  ? SZ_4K  :	0)

#define bytes_to_iopgsz(bytes)				\
	(((bytes) == SZ_16M) ? MMU_CAM_PGSZ_16M :	\
	 ((bytes) == SZ_1M)  ? MMU_CAM_PGSZ_1M  :	\
	 ((bytes) == SZ_64K) ? MMU_CAM_PGSZ_64K :	\
	 ((bytes) == SZ_4K)  ? MMU_CAM_PGSZ_4K  : -1)

#define iopgsz_to_bytes(iopgsz)				\
	(((iopgsz) == MMU_CAM_PGSZ_16M)	? SZ_16M :	\
	 ((iopgsz) == MMU_CAM_PGSZ_1M)	? SZ_1M  :	\
	 ((iopgsz) == MMU_CAM_PGSZ_64K)	? SZ_64K :	\
	 ((iopgsz) == MMU_CAM_PGSZ_4K)	? SZ_4K  : 0)

#define iopgsz_ok(bytes) (bytes_to_iopgsz(bytes) >= 0)

/*
 * global functions
 */
extern u32 iommu_arch_version(void);

extern void iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e);
extern u32 iotlb_cr_to_virt(struct cr_regs *cr);

extern int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e);
extern void flush_iotlb_page(struct iommu *obj, u32 da);
extern void flush_iotlb_range(struct iommu *obj, u32 start, u32 end);
extern void flush_iotlb_all(struct iommu *obj);

extern int iopgtable_store_entry(struct iommu *obj, struct iotlb_entry *e);
extern size_t iopgtable_clear_entry(struct iommu *obj, u32 iova);

extern struct iommu *iommu_get(const char *name);
extern void iommu_put(struct iommu *obj);

extern void iommu_save_ctx(struct iommu *obj);
extern void iommu_restore_ctx(struct iommu *obj);

extern int install_iommu_arch(const struct iommu_functions *ops);
extern void uninstall_iommu_arch(const struct iommu_functions *ops);

extern int foreach_iommu_device(void *data,
				int (*fn)(struct device *, void *));

extern ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t len);
extern size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t len);

#endif /* __MACH_IOMMU_H */