mirror of
https://github.com/adulau/aha.git
synced 2024-12-27 19:26:25 +00:00
[WATCHDOG] ks8695_wdt.c - new KS8695 watchdog driver
Watchdog driver for the Kendin/Micrel KS8695 processor. Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Andrew Victor
Wim Van Sebroeck
parent
55b637c6a0
commit
ccb8f430ac
3 changed files with 316 additions and 0 deletions
|
|
@ -115,6 +115,13 @@ config IXP4XX_WATCHDOG
|
|||
|
||||
Say N if you are unsure.
|
||||
|
||||
config KS8695_WATCHDOG
|
||||
tristate "KS8695 watchdog"
|
||||
depends on ARCH_KS8695
|
||||
help
|
||||
Watchdog timer embedded into KS8695 processor. This will reboot your
|
||||
system when the timeout is reached.
|
||||
|
||||
config S3C2410_WATCHDOG
|
||||
tristate "S3C2410 Watchdog"
|
||||
depends on ARCH_S3C2410
|
||||
|
|
|
|||
|
|
@ -29,6 +29,7 @@ obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
|
|||
obj-$(CONFIG_977_WATCHDOG) += wdt977.o
|
||||
obj-$(CONFIG_IXP2000_WATCHDOG) += ixp2000_wdt.o
|
||||
obj-$(CONFIG_IXP4XX_WATCHDOG) += ixp4xx_wdt.o
|
||||
obj-$(CONFIG_KS8695_WATCHDOG) += ks8695_wdt.o
|
||||
obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
|
||||
obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o
|
||||
obj-$(CONFIG_MPCORE_WATCHDOG) += mpcore_wdt.o
|
||||
|
|
|
|||
308
drivers/char/watchdog/ks8695_wdt.c
Normal file
308
drivers/char/watchdog/ks8695_wdt.c
Normal file
|
|
@ -0,0 +1,308 @@
|
|||
/*
|
||||
* Watchdog driver for Kendin/Micrel KS8695.
|
||||
*
|
||||
* (C) 2007 Andrew Victor
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/errno.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/watchdog.h>
|
||||
#include <asm/bitops.h>
|
||||
#include <asm/io.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <asm/arch/regs-timer.h>
|
||||
|
||||
|
||||
#define WDT_DEFAULT_TIME 5 /* seconds */
|
||||
#define WDT_MAX_TIME 171 /* seconds */
|
||||
|
||||
static int wdt_time = WDT_DEFAULT_TIME;
|
||||
static int nowayout = WATCHDOG_NOWAYOUT;
|
||||
|
||||
module_param(wdt_time, int, 0);
|
||||
MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="__MODULE_STRING(WDT_DEFAULT_TIME) ")");
|
||||
|
||||
#ifdef CONFIG_WATCHDOG_NOWAYOUT
|
||||
module_param(nowayout, int, 0);
|
||||
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
||||
#endif
|
||||
|
||||
|
||||
static unsigned long ks8695wdt_busy;
|
||||
|
||||
/* ......................................................................... */
|
||||
|
||||
/*
|
||||
* Disable the watchdog.
|
||||
*/
|
||||
static void inline ks8695_wdt_stop(void)
|
||||
{
|
||||
unsigned long tmcon;
|
||||
|
||||
/* disable timer0 */
|
||||
tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
|
||||
__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
|
||||
}
|
||||
|
||||
/*
|
||||
* Enable and reset the watchdog.
|
||||
*/
|
||||
static void inline ks8695_wdt_start(void)
|
||||
{
|
||||
unsigned long tmcon;
|
||||
unsigned long tval = wdt_time * CLOCK_TICK_RATE;
|
||||
|
||||
/* disable timer0 */
|
||||
tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
|
||||
__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
|
||||
|
||||
/* program timer0 */
|
||||
__raw_writel(tval | T0TC_WATCHDOG, KS8695_TMR_VA + KS8695_T0TC);
|
||||
|
||||
/* re-enable timer0 */
|
||||
tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
|
||||
__raw_writel(tmcon | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
|
||||
}
|
||||
|
||||
/*
|
||||
* Reload the watchdog timer. (ie, pat the watchdog)
|
||||
*/
|
||||
static void inline ks8695_wdt_reload(void)
|
||||
{
|
||||
unsigned long tmcon;
|
||||
|
||||
/* disable, then re-enable timer0 */
|
||||
tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
|
||||
__raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
|
||||
__raw_writel(tmcon | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
|
||||
}
|
||||
|
||||
/*
|
||||
* Change the watchdog time interval.
|
||||
*/
|
||||
static int ks8695_wdt_settimeout(int new_time)
|
||||
{
|
||||
/*
|
||||
* All counting occurs at SLOW_CLOCK / 128 = 0.256 Hz
|
||||
*
|
||||
* Since WDV is a 16-bit counter, the maximum period is
|
||||
* 65536 / 0.256 = 256 seconds.
|
||||
*/
|
||||
if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
|
||||
return -EINVAL;
|
||||
|
||||
/* Set new watchdog time. It will be used when ks8695_wdt_start() is called. */
|
||||
wdt_time = new_time;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* ......................................................................... */
|
||||
|
||||
/*
|
||||
* Watchdog device is opened, and watchdog starts running.
|
||||
*/
|
||||
static int ks8695_wdt_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (test_and_set_bit(0, &ks8695wdt_busy))
|
||||
return -EBUSY;
|
||||
|
||||
ks8695_wdt_start();
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
/*
|
||||
* Close the watchdog device.
|
||||
* If CONFIG_WATCHDOG_NOWAYOUT is NOT defined then the watchdog is also
|
||||
* disabled.
|
||||
*/
|
||||
static int ks8695_wdt_close(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (!nowayout)
|
||||
ks8695_wdt_stop(); /* Disable the watchdog when file is closed */
|
||||
|
||||
clear_bit(0, &ks8695wdt_busy);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct watchdog_info ks8695_wdt_info = {
|
||||
.identity = "ks8695 watchdog",
|
||||
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
|
||||
};
|
||||
|
||||
/*
|
||||
* Handle commands from user-space.
|
||||
*/
|
||||
static int ks8695_wdt_ioctl(struct inode *inode, struct file *file,
|
||||
unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
void __user *argp = (void __user *)arg;
|
||||
int __user *p = argp;
|
||||
int new_value;
|
||||
|
||||
switch(cmd) {
|
||||
case WDIOC_KEEPALIVE:
|
||||
ks8695_wdt_reload(); /* pat the watchdog */
|
||||
return 0;
|
||||
|
||||
case WDIOC_GETSUPPORT:
|
||||
return copy_to_user(argp, &ks8695_wdt_info, sizeof(ks8695_wdt_info)) ? -EFAULT : 0;
|
||||
|
||||
case WDIOC_SETTIMEOUT:
|
||||
if (get_user(new_value, p))
|
||||
return -EFAULT;
|
||||
|
||||
if (ks8695_wdt_settimeout(new_value))
|
||||
return -EINVAL;
|
||||
|
||||
/* Enable new time value */
|
||||
ks8695_wdt_start();
|
||||
|
||||
/* Return current value */
|
||||
return put_user(wdt_time, p);
|
||||
|
||||
case WDIOC_GETTIMEOUT:
|
||||
return put_user(wdt_time, p);
|
||||
|
||||
case WDIOC_GETSTATUS:
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
return put_user(0, p);
|
||||
|
||||
case WDIOC_SETOPTIONS:
|
||||
if (get_user(new_value, p))
|
||||
return -EFAULT;
|
||||
|
||||
if (new_value & WDIOS_DISABLECARD)
|
||||
ks8695_wdt_stop();
|
||||
if (new_value & WDIOS_ENABLECARD)
|
||||
ks8695_wdt_start();
|
||||
return 0;
|
||||
|
||||
default:
|
||||
return -ENOTTY;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Pat the watchdog whenever device is written to.
|
||||
*/
|
||||
static ssize_t ks8695_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
|
||||
{
|
||||
ks8695_wdt_reload(); /* pat the watchdog */
|
||||
return len;
|
||||
}
|
||||
|
||||
/* ......................................................................... */
|
||||
|
||||
static const struct file_operations ks8695wdt_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.ioctl = ks8695_wdt_ioctl,
|
||||
.open = ks8695_wdt_open,
|
||||
.release = ks8695_wdt_close,
|
||||
.write = ks8695_wdt_write,
|
||||
};
|
||||
|
||||
static struct miscdevice ks8695wdt_miscdev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &ks8695wdt_fops,
|
||||
};
|
||||
|
||||
static int __init ks8695wdt_probe(struct platform_device *pdev)
|
||||
{
|
||||
int res;
|
||||
|
||||
if (ks8695wdt_miscdev.parent)
|
||||
return -EBUSY;
|
||||
ks8695wdt_miscdev.parent = &pdev->dev;
|
||||
|
||||
res = misc_register(&ks8695wdt_miscdev);
|
||||
if (res)
|
||||
return res;
|
||||
|
||||
printk("KS8695 Watchdog Timer enabled (%d seconds%s)\n", wdt_time, nowayout ? ", nowayout" : "");
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __exit ks8695wdt_remove(struct platform_device *pdev)
|
||||
{
|
||||
int res;
|
||||
|
||||
res = misc_deregister(&ks8695wdt_miscdev);
|
||||
if (!res)
|
||||
ks8695wdt_miscdev.parent = NULL;
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
static void ks8695wdt_shutdown(struct platform_device *pdev)
|
||||
{
|
||||
ks8695_wdt_stop();
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
|
||||
static int ks8695wdt_suspend(struct platform_device *pdev, pm_message_t message)
|
||||
{
|
||||
ks8695_wdt_stop();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ks8695wdt_resume(struct platform_device *pdev)
|
||||
{
|
||||
if (ks8695wdt_busy)
|
||||
ks8695_wdt_start();
|
||||
return 0;
|
||||
}
|
||||
|
||||
#else
|
||||
#define ks8695wdt_suspend NULL
|
||||
#define ks8695wdt_resume NULL
|
||||
#endif
|
||||
|
||||
static struct platform_driver ks8695wdt_driver = {
|
||||
.probe = ks8695wdt_probe,
|
||||
.remove = __exit_p(ks8695wdt_remove),
|
||||
.shutdown = ks8695wdt_shutdown,
|
||||
.suspend = ks8695wdt_suspend,
|
||||
.resume = ks8695wdt_resume,
|
||||
.driver = {
|
||||
.name = "ks8695_wdt",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init ks8695_wdt_init(void)
|
||||
{
|
||||
/* Check that the heartbeat value is within range; if not reset to the default */
|
||||
if (ks8695_wdt_settimeout(wdt_time)) {
|
||||
ks8695_wdt_settimeout(WDT_DEFAULT_TIME);
|
||||
pr_info("ks8695_wdt: wdt_time value must be 1 <= wdt_time <= %i, using %d\n", wdt_time, WDT_MAX_TIME);
|
||||
}
|
||||
|
||||
return platform_driver_register(&ks8695wdt_driver);
|
||||
}
|
||||
|
||||
static void __exit ks8695_wdt_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&ks8695wdt_driver);
|
||||
}
|
||||
|
||||
module_init(ks8695_wdt_init);
|
||||
module_exit(ks8695_wdt_exit);
|
||||
|
||||
MODULE_AUTHOR("Andrew Victor");
|
||||
MODULE_DESCRIPTION("Watchdog driver for KS8695");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
||||
Loading…
Reference in a new issue