aboutsummaryrefslogtreecommitdiff
path: root/include/timer.h
blob: dcc803c392a014ae589d6e7768fcf3b39e5d42fc (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
/*
 * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#ifndef _TIMER_H_
#define _TIMER_H_

/*
 * dm_timer_init - initialize a timer for time keeping. On success
 * initializes gd->timer so that lib/timer can use it for future
 * referrence.
 *
 * @return - 0 on success or error number
 */
int dm_timer_init(void);

/*
 * timer_conv_64 - convert 32-bit counter value to 64-bit
 *
 * @count: 32-bit counter value
 * @return: 64-bit counter value
 */
u64 timer_conv_64(u32 count);

/*
 * Get the current timer count
 *
 * @dev: The timer device
 * @count: pointer that returns the current timer count
 * @return: 0 if OK, -ve on error
 */
int timer_get_count(struct udevice *dev, u64 *count);

/*
 * Get the timer input clock frequency
 *
 * @dev: The timer device
 * @return: the timer input clock frequency
 */
unsigned long timer_get_rate(struct udevice *dev);

/*
 * struct timer_ops - Driver model timer operations
 *
 * The uclass interface is implemented by all timer devices which use
 * driver model.
 */
struct timer_ops {
	/*
	 * Get the current timer count
	 *
	 * @dev: The timer device
	 * @count: pointer that returns the current 64-bit timer count
	 * @return: 0 if OK, -ve on error
	 */
	int (*get_count)(struct udevice *dev, u64 *count);
};

/*
 * struct timer_dev_priv - information about a device used by the uclass
 *
 * @clock_rate: the timer input clock frequency
 */
struct timer_dev_priv {
	unsigned long clock_rate;
};

/**
 * timer_early_get_count() - Implement timer_get_count() before driver model
 *
 * If CONFIG_TIMER_EARLY is enabled, this function wil be called to return
 * the current timer value before the proper driver model timer is ready.
 * It should be implemented by one of the timer values. This is mostly useful
 * for tracing.
 */
u64 timer_early_get_count(void);

/**
 * timer_early_get_rate() - Get the timer rate before driver model
 *
 * If CONFIG_TIMER_EARLY is enabled, this function wil be called to return
 * the current timer rate in Hz before the proper driver model timer is ready.
 * It should be implemented by one of the timer values. This is mostly useful
 * for tracing. This corresponds to the clock_rate value in struct
 * timer_dev_priv.
 */
unsigned long timer_early_get_rate(void);

#endif	/* _TIMER_H_ */