summaryrefslogtreecommitdiff
path: root/include/bootcount.h
blob: bfa5d4642764777dbfd37a51899b4df6ec5efecd (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
/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * (C) Copyright 2012
 * Stefan Roese, DENX Software Engineering, sr@denx.de.
 */
#ifndef _BOOTCOUNT_H__
#define _BOOTCOUNT_H__

#include <common.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <env.h>

#ifdef CONFIG_DM_BOOTCOUNT

struct bootcount_ops {
	/**
	 * get() - get the current bootcount value
	 *
	 * Returns the current counter value of the bootcount backing
	 * store.
	 *
	 * @dev:	Device to read from
	 * @bootcount:	Address to put the current bootcount value
	 */
	int (*get)(struct udevice *dev, u32 *bootcount);

	/**
	 * set() - set a bootcount value (e.g. to reset or increment)
	 *
	 * Sets the value in the bootcount backing store.
	 *
	 * @dev:	Device to read from
	 * @bootcount:	New bootcount value to store
	 */
	int (*set)(struct udevice *dev, const u32 bootcount);
};

/* Access the operations for a bootcount device */
#define bootcount_get_ops(dev)	((struct bootcount_ops *)(dev)->driver->ops)

/**
 * dm_bootcount_get() - Read the current value from a bootcount storage
 *
 * @dev:	Device to read from
 * @bootcount:	Place to put the current bootcount
 * Return: 0 if OK, -ve on error
 */
int dm_bootcount_get(struct udevice *dev, u32 *bootcount);

/**
 * dm_bootcount_set() - Write a value to a bootcount storage
 *
 * @dev:	Device to read from
 * @bootcount:  Value to be written to the backing storage
 * Return: 0 if OK, -ve on error
 */
int dm_bootcount_set(struct udevice *dev, u32 bootcount);

#endif

/** bootcount_store() - store the current bootcount */
void bootcount_store(ulong);

/**
 * bootcount_load() - load the current bootcount
 *
 * Return: bootcount, read from the appropriate location
 */
ulong bootcount_load(void);

#if defined(CONFIG_SPL_BOOTCOUNT_LIMIT) || defined(CONFIG_TPL_BOOTCOUNT_LIMIT) || defined(CONFIG_BOOTCOUNT_LIMIT)

#ifdef CONFIG_SYS_BOOTCOUNT_LE
static inline void raw_bootcount_store(volatile u32 *addr, u32 data)
{
	out_le32(addr, data);
}

static inline u32 raw_bootcount_load(volatile u32 *addr)
{
	return in_le32(addr);
}
#else
static inline void raw_bootcount_store(volatile u32 *addr, u32 data)
{
	out_be32(addr, data);
}

static inline u32 raw_bootcount_load(volatile u32 *addr)
{
	return in_be32(addr);
}
#endif

DECLARE_GLOBAL_DATA_PTR;
static inline int bootcount_error(void)
{
	unsigned long bootcount = bootcount_load();
	unsigned long bootlimit = env_get_ulong("bootlimit", 10, 0);

	if (bootlimit && bootcount > bootlimit) {
		printf("Warning: Bootlimit (%lu) exceeded.", bootlimit);
		if (!(gd->flags & GD_FLG_SPL_INIT))
			printf(" Using altbootcmd.");
		printf("\n");

		return 1;
	}

	return 0;
}

static inline void bootcount_inc(void)
{
	unsigned long bootcount = bootcount_load();

	if (gd->flags & GD_FLG_SPL_INIT) {
		bootcount_store(++bootcount);
		return;
	}

#ifndef CONFIG_SPL_BUILD
	/* Only increment bootcount when no bootcount support in SPL */
#if !defined(CONFIG_SPL_BOOTCOUNT_LIMIT) && !defined(CONFIG_TPL_BOOTCOUNT_LIMIT)
	bootcount_store(++bootcount);
#endif
	env_set_ulong("bootcount", bootcount);
#endif /* !CONFIG_SPL_BUILD */
}

#else
static inline int bootcount_error(void) { return 0; }
static inline void bootcount_inc(void) {}
#endif /* CONFIG_SPL_BOOTCOUNT_LIMIT || CONFIG_TPL_BOOTCOUNT_LIMIT || CONFIG_BOOTCOUNT_LIMIT */
#endif /* _BOOTCOUNT_H__ */