blob: 12aee5ba4e8d820bb3c9e153409fb7305afe1b9c [file] [log] [blame]
Thomas Choufb798b12015-10-09 13:46:34 +08001/*
2 * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <dm.h>
9#include <errno.h>
10#include <timer.h>
11
12/*
13 * Implement a Timer uclass to work with lib/time.c. The timer is usually
14 * a 32 bits free-running up counter. The get_rate() method is used to get
15 * the input clock frequency of the timer. The get_count() method is used
16 * get the current 32 bits count value. If the hardware is counting down,
17 * the value should be inversed inside the method. There may be no real
18 * tick, and no timer interrupt.
19 */
20
21int timer_get_count(struct udevice *dev, unsigned long *count)
22{
23 const struct timer_ops *ops = device_get_ops(dev);
24
25 if (!ops->get_count)
26 return -ENOSYS;
27
28 return ops->get_count(dev, count);
29}
30
31unsigned long timer_get_rate(struct udevice *dev)
32{
33 struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
34
35 return uc_priv->clock_rate;
36}
37
38UCLASS_DRIVER(timer) = {
39 .id = UCLASS_TIMER,
40 .name = "timer",
41 .per_device_auto_alloc_size = sizeof(struct timer_dev_priv),
42};