mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-06 19:26:16 +09:00
c8a7ba9e6a
Implement a Timer uclass to work with lib/time.c. Signed-off-by: Thomas Chou <thomas@wytron.com.tw> Acked-by: Simon Glass <sjg@chromium.org>
43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
/*
|
|
* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <timer.h>
|
|
|
|
/*
|
|
* Implement a Timer uclass to work with lib/time.c. The timer is usually
|
|
* a 32 bits free-running up counter. The get_rate() method is used to get
|
|
* the input clock frequency of the timer. The get_count() method is used
|
|
* get the current 32 bits count value. If the hardware is counting down,
|
|
* the value should be inversed inside the method. There may be no real
|
|
* tick, and no timer interrupt.
|
|
*/
|
|
|
|
int timer_get_count(struct udevice *dev, unsigned long *count)
|
|
{
|
|
const struct timer_ops *ops = device_get_ops(dev);
|
|
|
|
if (!ops->get_count)
|
|
return -ENOSYS;
|
|
|
|
return ops->get_count(dev, count);
|
|
}
|
|
|
|
unsigned long timer_get_rate(struct udevice *dev)
|
|
{
|
|
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
|
|
|
|
return uc_priv->clock_rate;
|
|
}
|
|
|
|
UCLASS_DRIVER(timer) = {
|
|
.id = UCLASS_TIMER,
|
|
.name = "timer",
|
|
.per_device_auto_alloc_size = sizeof(struct timer_dev_priv),
|
|
};
|