2005-04-17 06:20:36 +08:00
|
|
|
/*
|
2006-10-04 05:01:26 +08:00
|
|
|
* drivers/char/watchdog/ixp4xx_wdt.c
|
2005-04-17 06:20:36 +08:00
|
|
|
*
|
|
|
|
* Watchdog driver for Intel IXP4xx network processors
|
|
|
|
*
|
|
|
|
* Author: Deepak Saxena <dsaxena@plexity.net>
|
|
|
|
*
|
|
|
|
* Copyright 2004 (c) MontaVista, Software, Inc.
|
|
|
|
* Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
|
|
|
|
*
|
|
|
|
* This file is licensed under the terms of the GNU General Public
|
|
|
|
* License version 2. This program is licensed "as is" without any
|
|
|
|
* warranty of any kind, whether express or implied.
|
|
|
|
*/
|
|
|
|
|
2012-02-16 07:06:19 +08:00
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/moduleparam.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/fs.h>
|
|
|
|
#include <linux/miscdevice.h>
|
2019-01-27 21:08:36 +08:00
|
|
|
#include <linux/of.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
#include <linux/watchdog.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/bitops.h>
|
2008-07-15 19:46:11 +08:00
|
|
|
#include <linux/uaccess.h>
|
2008-08-05 23:14:15 +08:00
|
|
|
#include <mach/hardware.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2012-03-05 23:51:11 +08:00
|
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
2005-04-17 06:20:36 +08:00
|
|
|
static int heartbeat = 60; /* (secs) Default is 1 minute */
|
|
|
|
static unsigned long wdt_status;
|
|
|
|
static unsigned long boot_status;
|
2008-08-10 19:03:41 +08:00
|
|
|
static DEFINE_SPINLOCK(wdt_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
#define WDT_TICK_RATE (IXP4XX_PERIPHERAL_BUS_CLOCK * 1000000UL)
|
|
|
|
|
|
|
|
#define WDT_IN_USE 0
|
|
|
|
#define WDT_OK_TO_CLOSE 1
|
|
|
|
|
2008-05-19 21:06:48 +08:00
|
|
|
static void wdt_enable(void)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2008-05-19 21:06:48 +08:00
|
|
|
spin_lock(&wdt_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
*IXP4XX_OSWK = IXP4XX_WDT_KEY;
|
|
|
|
*IXP4XX_OSWE = 0;
|
|
|
|
*IXP4XX_OSWT = WDT_TICK_RATE * heartbeat;
|
|
|
|
*IXP4XX_OSWE = IXP4XX_WDT_COUNT_ENABLE | IXP4XX_WDT_RESET_ENABLE;
|
|
|
|
*IXP4XX_OSWK = 0;
|
2008-05-19 21:06:48 +08:00
|
|
|
spin_unlock(&wdt_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2008-05-19 21:06:48 +08:00
|
|
|
static void wdt_disable(void)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2008-05-19 21:06:48 +08:00
|
|
|
spin_lock(&wdt_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
*IXP4XX_OSWK = IXP4XX_WDT_KEY;
|
|
|
|
*IXP4XX_OSWE = 0;
|
|
|
|
*IXP4XX_OSWK = 0;
|
2008-05-19 21:06:48 +08:00
|
|
|
spin_unlock(&wdt_lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2008-05-19 21:06:48 +08:00
|
|
|
static int ixp4xx_wdt_open(struct inode *inode, struct file *file)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
if (test_and_set_bit(WDT_IN_USE, &wdt_status))
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
|
|
|
wdt_enable();
|
2019-03-27 04:51:19 +08:00
|
|
|
return stream_open(inode, file);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t
|
|
|
|
ixp4xx_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
|
|
|
|
{
|
|
|
|
if (len) {
|
|
|
|
if (!nowayout) {
|
|
|
|
size_t i;
|
|
|
|
|
|
|
|
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
|
|
|
|
|
|
|
for (i = 0; i != len; i++) {
|
|
|
|
char c;
|
|
|
|
|
|
|
|
if (get_user(c, data + i))
|
|
|
|
return -EFAULT;
|
|
|
|
if (c == 'V')
|
|
|
|
set_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
wdt_enable();
|
|
|
|
}
|
|
|
|
return len;
|
|
|
|
}
|
|
|
|
|
2009-12-27 02:55:22 +08:00
|
|
|
static const struct watchdog_info ident = {
|
2005-04-17 06:20:36 +08:00
|
|
|
.options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
|
|
|
|
WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
|
|
|
|
.identity = "IXP4xx Watchdog",
|
|
|
|
};
|
|
|
|
|
|
|
|
|
2008-05-19 21:06:48 +08:00
|
|
|
static long ixp4xx_wdt_ioctl(struct file *file, unsigned int cmd,
|
|
|
|
unsigned long arg)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2006-09-09 23:34:31 +08:00
|
|
|
int ret = -ENOTTY;
|
2005-04-17 06:20:36 +08:00
|
|
|
int time;
|
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
case WDIOC_GETSUPPORT:
|
|
|
|
ret = copy_to_user((struct watchdog_info *)arg, &ident,
|
|
|
|
sizeof(ident)) ? -EFAULT : 0;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case WDIOC_GETSTATUS:
|
|
|
|
ret = put_user(0, (int *)arg);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case WDIOC_GETBOOTSTATUS:
|
|
|
|
ret = put_user(boot_status, (int *)arg);
|
|
|
|
break;
|
|
|
|
|
2008-07-18 19:41:17 +08:00
|
|
|
case WDIOC_KEEPALIVE:
|
|
|
|
wdt_enable();
|
|
|
|
ret = 0;
|
|
|
|
break;
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
case WDIOC_SETTIMEOUT:
|
|
|
|
ret = get_user(time, (int *)arg);
|
|
|
|
if (ret)
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (time <= 0 || time > 60) {
|
|
|
|
ret = -EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
heartbeat = time;
|
|
|
|
wdt_enable();
|
2020-07-08 01:11:21 +08:00
|
|
|
fallthrough;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
case WDIOC_GETTIMEOUT:
|
|
|
|
ret = put_user(heartbeat, (int *)arg);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-05-19 21:06:48 +08:00
|
|
|
static int ixp4xx_wdt_release(struct inode *inode, struct file *file)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2008-05-19 21:06:48 +08:00
|
|
|
if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
|
2005-04-17 06:20:36 +08:00
|
|
|
wdt_disable();
|
2008-05-19 21:06:48 +08:00
|
|
|
else
|
2012-02-16 07:06:19 +08:00
|
|
|
pr_crit("Device closed unexpectedly - timer will not stop\n");
|
2005-04-17 06:20:36 +08:00
|
|
|
clear_bit(WDT_IN_USE, &wdt_status);
|
|
|
|
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2008-08-07 04:19:41 +08:00
|
|
|
static const struct file_operations ixp4xx_wdt_fops = {
|
2005-04-17 06:20:36 +08:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.llseek = no_llseek,
|
|
|
|
.write = ixp4xx_wdt_write,
|
2008-05-19 21:06:48 +08:00
|
|
|
.unlocked_ioctl = ixp4xx_wdt_ioctl,
|
2019-06-03 20:23:09 +08:00
|
|
|
.compat_ioctl = compat_ptr_ioctl,
|
2005-04-17 06:20:36 +08:00
|
|
|
.open = ixp4xx_wdt_open,
|
|
|
|
.release = ixp4xx_wdt_release,
|
|
|
|
};
|
|
|
|
|
2008-08-07 04:19:41 +08:00
|
|
|
static struct miscdevice ixp4xx_wdt_miscdev = {
|
2005-04-17 06:20:36 +08:00
|
|
|
.minor = WATCHDOG_MINOR,
|
2005-08-17 14:58:34 +08:00
|
|
|
.name = "watchdog",
|
2005-04-17 06:20:36 +08:00
|
|
|
.fops = &ixp4xx_wdt_fops,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init ixp4xx_wdt_init(void)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2019-01-27 21:08:36 +08:00
|
|
|
/*
|
|
|
|
* FIXME: we bail out on device tree boot but this really needs
|
|
|
|
* to be fixed in a nicer way: this registers the MDIO bus before
|
|
|
|
* even matching the driver infrastructure, we should only probe
|
|
|
|
* detected hardware.
|
|
|
|
*/
|
|
|
|
if (of_have_populated_dt())
|
|
|
|
return -ENODEV;
|
2008-08-11 01:08:10 +08:00
|
|
|
if (!(read_cpuid_id() & 0xf) && !cpu_is_ixp46x()) {
|
2012-02-16 07:06:19 +08:00
|
|
|
pr_err("Rev. A0 IXP42x CPU detected - watchdog disabled\n");
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
boot_status = (*IXP4XX_OSST & IXP4XX_OSST_TIMER_WARM_RESET) ?
|
|
|
|
WDIOF_CARDRESET : 0;
|
|
|
|
ret = misc_register(&ixp4xx_wdt_miscdev);
|
|
|
|
if (ret == 0)
|
2012-02-16 07:06:19 +08:00
|
|
|
pr_info("timer heartbeat %d sec\n", heartbeat);
|
2005-04-17 06:20:36 +08:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit ixp4xx_wdt_exit(void)
|
|
|
|
{
|
|
|
|
misc_deregister(&ixp4xx_wdt_miscdev);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
module_init(ixp4xx_wdt_init);
|
|
|
|
module_exit(ixp4xx_wdt_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
|
|
|
|
MODULE_DESCRIPTION("IXP4xx Network Processor Watchdog");
|
|
|
|
|
|
|
|
module_param(heartbeat, int, 0);
|
|
|
|
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 60s)");
|
|
|
|
|
2012-03-05 23:51:11 +08:00
|
|
|
module_param(nowayout, bool, 0);
|
2005-04-17 06:20:36 +08:00
|
|
|
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|