mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-05 03:42:49 +02:00
bf84c66678
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20324 3c298f89-4303-0410-b956-a3cf2f4a3e73
287 lines
6.5 KiB
C
287 lines
6.5 KiB
C
/*
|
|
* RDC321x watchdog driver
|
|
*
|
|
* Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/init.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <asm/rdc321x_defs.h>
|
|
|
|
extern int rdc321x_pci_write(int reg, u32 val);
|
|
extern int rdc321x_pci_read(int reg, u32 *val);
|
|
|
|
#define RDC321X_WDT_REG 0x00000044
|
|
|
|
#define RDC_WDT_EN 0x00800000 /* Enable bit */
|
|
#define RDC_WDT_WDTIRQ 0x00400000 /* Create WDT IRQ before CPU reset */
|
|
#define RDC_WDT_NMIIRQ 0x00200000 /* Create NMI IRQ before CPU reset */
|
|
#define RDC_WDT_RST 0x00100000 /* Reset wdt */
|
|
#define RDC_WDT_NIF 0x00080000 /* NMI interrupt occured */
|
|
#define RDC_WDT_WIF 0x00040000 /* WDT interrupt occured */
|
|
#define RDC_WDT_IRT 0x00000700 /* IRQ Routing table */
|
|
#define RDC_WDT_CNT 0x0000007F /* WDT count */
|
|
|
|
/* default counter value (2.34 s) */
|
|
#define RDC_WDT_DFLT_CNT 0x00000040
|
|
|
|
#define RDC_WDT_SETUP (RDC_WDT_EN | RDC_WDT_NMIIRQ | RDC_WDT_RST | RDC_WDT_DFLT_CNT)
|
|
|
|
/* some device data */
|
|
static struct {
|
|
struct timer_list timer;
|
|
int seconds_left;
|
|
int total_seconds;
|
|
bool inuse;
|
|
bool running;
|
|
bool close_expected;
|
|
} rdc321x_wdt_dev;
|
|
|
|
static struct watchdog_info ident = {
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
|
|
.identity = "RDC321x WDT",
|
|
};
|
|
|
|
/* generic helper functions */
|
|
static void rdc321x_wdt_timer(unsigned long unused)
|
|
{
|
|
if (!rdc321x_wdt_dev.running) {
|
|
rdc321x_pci_write(RDC321X_WDT_REG, 0);
|
|
return;
|
|
}
|
|
|
|
rdc321x_wdt_dev.seconds_left--;
|
|
|
|
if (rdc321x_wdt_dev.seconds_left < 1)
|
|
return;
|
|
|
|
rdc321x_pci_write(RDC321X_WDT_REG, RDC_WDT_SETUP);
|
|
|
|
mod_timer(&rdc321x_wdt_dev.timer, HZ * 2 + jiffies);
|
|
}
|
|
|
|
static void rdc321x_wdt_reset(void)
|
|
{
|
|
rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds;
|
|
}
|
|
|
|
static void rdc321x_wdt_start(void)
|
|
{
|
|
if (rdc321x_wdt_dev.running)
|
|
return;
|
|
|
|
rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds;
|
|
|
|
rdc321x_wdt_dev.running = true;
|
|
|
|
rdc321x_wdt_timer(0);
|
|
|
|
return;
|
|
}
|
|
|
|
static int rdc321x_wdt_stop(void)
|
|
{
|
|
if (WATCHDOG_NOWAYOUT)
|
|
return -ENOSYS;
|
|
|
|
rdc321x_wdt_dev.running = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* filesystem operations */
|
|
static int rdc321x_wdt_open(struct inode *inode, struct file *file)
|
|
{
|
|
if (xchg(&rdc321x_wdt_dev.inuse, true))
|
|
return -EBUSY;
|
|
|
|
return nonseekable_open(inode, file);
|
|
}
|
|
|
|
static int rdc321x_wdt_release(struct inode *inode, struct file *file)
|
|
{
|
|
int res;
|
|
if (rdc321x_wdt_dev.close_expected) {
|
|
res = rdc321x_wdt_stop();
|
|
if (res)
|
|
return res;
|
|
}
|
|
|
|
rdc321x_wdt_dev.inuse = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long rdc321x_wdt_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
int value;
|
|
|
|
switch (cmd) {
|
|
case WDIOC_KEEPALIVE:
|
|
rdc321x_wdt_reset();
|
|
break;
|
|
case WDIOC_GETSUPPORT:
|
|
if (copy_to_user(argp, &ident, sizeof(ident)))
|
|
return -EFAULT;
|
|
break;
|
|
case WDIOC_SETTIMEOUT:
|
|
if (copy_from_user(&rdc321x_wdt_dev.total_seconds, argp, sizeof(int)))
|
|
return -EFAULT;
|
|
rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds;
|
|
break;
|
|
case WDIOC_GETTIMEOUT:
|
|
if (copy_to_user(argp, &rdc321x_wdt_dev.total_seconds, sizeof(int)))
|
|
return -EFAULT;
|
|
break;
|
|
case WDIOC_GETTIMELEFT:
|
|
if (copy_to_user(argp, &rdc321x_wdt_dev.seconds_left, sizeof(int)))
|
|
return -EFAULT;
|
|
break;
|
|
case WDIOC_SETOPTIONS:
|
|
if (copy_from_user(&value, argp, sizeof(int)))
|
|
return -EFAULT;
|
|
switch (value) {
|
|
case WDIOS_ENABLECARD:
|
|
rdc321x_wdt_start();
|
|
break;
|
|
case WDIOS_DISABLECARD:
|
|
return rdc321x_wdt_stop();
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
size_t i;
|
|
|
|
if (!count)
|
|
return -EIO;
|
|
|
|
rdc321x_wdt_dev.close_expected = false;
|
|
|
|
for (i = 0; i != count; i++) {
|
|
char c;
|
|
|
|
if (get_user(c, buf + i))
|
|
return -EFAULT;
|
|
|
|
if (c == 'V') {
|
|
rdc321x_wdt_dev.close_expected = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
rdc321x_wdt_reset();
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations rdc321x_wdt_fops = {
|
|
.llseek = no_llseek,
|
|
.unlocked_ioctl = rdc321x_wdt_ioctl,
|
|
.open = rdc321x_wdt_open,
|
|
.write = rdc321x_wdt_write,
|
|
.release = rdc321x_wdt_release,
|
|
};
|
|
|
|
static struct miscdevice rdc321x_wdt_misc = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &rdc321x_wdt_fops,
|
|
};
|
|
|
|
static int __init rdc321x_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
int err;
|
|
|
|
err = rdc321x_pci_write(RDC321X_WDT_REG, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
rdc321x_wdt_dev.running = false;
|
|
rdc321x_wdt_dev.close_expected = false;
|
|
rdc321x_wdt_dev.inuse = 0;
|
|
setup_timer(&rdc321x_wdt_dev.timer, rdc321x_wdt_timer, 0);
|
|
rdc321x_wdt_dev.total_seconds = 100;
|
|
|
|
err = misc_register(&rdc321x_wdt_misc);
|
|
if (err < 0) {
|
|
printk(KERN_ERR PFX "watchdog: misc_register failed\n");
|
|
return err;
|
|
}
|
|
|
|
dev_info(&pdev->dev, "watchdog init success\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit rdc321x_wdt_remove(struct platform_device *pdev)
|
|
{
|
|
if (rdc321x_wdt_dev.inuse)
|
|
rdc321x_wdt_dev.inuse = 0;
|
|
|
|
while (timer_pending(&rdc321x_wdt_dev.timer))
|
|
msleep(100);
|
|
|
|
misc_deregister(&rdc321x_wdt_misc);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver rdc321x_wdt_driver = {
|
|
.driver.name = "rdc321x-wdt",
|
|
.driver.owner = THIS_MODULE,
|
|
.probe = rdc321x_wdt_probe,
|
|
.remove = __devexit_p(rdc321x_wdt_remove),
|
|
};
|
|
|
|
static int __init rdc321x_wdt_init(void)
|
|
{
|
|
return platform_driver_register(&rdc321x_wdt_driver);
|
|
}
|
|
|
|
static void __exit rdc321x_wdt_exit(void)
|
|
{
|
|
platform_driver_unregister(&rdc321x_wdt_driver);
|
|
}
|
|
|
|
module_init(rdc321x_wdt_init);
|
|
module_exit(rdc321x_wdt_exit);
|
|
|
|
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
|
|
MODULE_DESCRIPTION("RDC321x Watchdog driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:rdc321x-wdt");
|