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>master
parent
bcae80e955
commit
c8a7ba9e6a
@ -0,0 +1,12 @@ |
||||
menu "Timer Support" |
||||
|
||||
config TIMER |
||||
bool "Enable Driver Model for Timer drivers" |
||||
depends on DM |
||||
help |
||||
Enable driver model for Timer access. It uses the same API as |
||||
lib/time.c. But now implemented by the uclass. The first timer |
||||
will be used. The timer is usually a 32 bits free-running up |
||||
counter. There may be no real tick, and no timer interrupt. |
||||
|
||||
endmenu |
@ -0,0 +1,7 @@ |
||||
#
|
||||
# Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
|
||||
#
|
||||
# SPDX-License-Identifier: GPL-2.0+
|
||||
#
|
||||
|
||||
obj-$(CONFIG_TIMER) += timer-uclass.o
|
@ -0,0 +1,42 @@ |
||||
/*
|
||||
* 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), |
||||
}; |
@ -0,0 +1,52 @@ |
||||
/*
|
||||
* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw> |
||||
* |
||||
* SPDX-License-Identifier: GPL-2.0+ |
||||
*/ |
||||
|
||||
#ifndef _TIMER_H_ |
||||
#define _TIMER_H_ |
||||
|
||||
/*
|
||||
* 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, unsigned long *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 timer count |
||||
* @return: 0 if OK, -ve on error |
||||
*/ |
||||
int (*get_count)(struct udevice *dev, unsigned long *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; |
||||
}; |
||||
|
||||
#endif /* _TIMER_H_ */ |
Loading…
Reference in new issue