diff options
Diffstat (limited to 'target/linux/atheros/files-2.6.28/drivers/watchdog/ar2315-wtd.c')
| -rw-r--r-- | target/linux/atheros/files-2.6.28/drivers/watchdog/ar2315-wtd.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/target/linux/atheros/files-2.6.28/drivers/watchdog/ar2315-wtd.c b/target/linux/atheros/files-2.6.28/drivers/watchdog/ar2315-wtd.c new file mode 100644 index 0000000000..d71b6f6848 --- /dev/null +++ b/target/linux/atheros/files-2.6.28/drivers/watchdog/ar2315-wtd.c @@ -0,0 +1,198 @@ +/* + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Copyright (C) 2008 John Crispin <blogic@openwrt.org> + * Based on EP93xx and ifxmips wdt driver + */ + +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/types.h> +#include <linux/miscdevice.h> +#include <linux/watchdog.h> +#include <linux/fs.h> +#include <linux/ioport.h> +#include <linux/notifier.h> +#include <linux/reboot.h> +#include <linux/init.h> +#include <linux/platform_device.h> + +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/system.h> +#include <asm/addrspace.h> +#include <ar531x.h> + +#define CLOCK_RATE 40000000 +#define HEARTBEAT(x) (x < 1 || x > 90)?(20):(x) + +static int wdt_timeout = 20; +static int started = 0; +static int in_use = 0; + +static void +ar2315_wdt_enable(void) +{ + sysRegWrite(AR5315_WD, wdt_timeout * CLOCK_RATE); + sysRegWrite(AR5315_ISR, 0x80); +} + +static ssize_t +ar2315_wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) +{ + if(len) + ar2315_wdt_enable(); + return len; +} + +static int +ar2315_wdt_open(struct inode *inode, struct file *file) +{ + if(in_use) + return -EBUSY; + ar2315_wdt_enable(); + in_use = started = 1; + return nonseekable_open(inode, file); +} + +static int +ar2315_wdt_release(struct inode *inode, struct file *file) +{ + in_use = 0; + return 0; +} + +static irqreturn_t +ar2315_wdt_interrupt(int irq, void *dev_id) +{ + if(started) + { + printk(KERN_CRIT "watchdog expired, rebooting system\n"); + emergency_restart(); + } else { + sysRegWrite(AR5315_WDC, 0); + sysRegWrite(AR5315_WD, 0); + sysRegWrite(AR5315_ISR, 0x80); + } + return IRQ_HANDLED; +} + +static struct watchdog_info ident = { + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, + .identity = "ar2315 Watchdog", +}; + +static int +ar2315_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) +{ + int new_wdt_timeout; + int ret = -ENOIOCTLCMD; + + switch(cmd) + { + case WDIOC_GETSUPPORT: + ret = copy_to_user((struct watchdog_info __user *)arg, &ident, sizeof(ident)) ? -EFAULT : 0; + break; + + case WDIOC_KEEPALIVE: + ar2315_wdt_enable(); + ret = 0; + break; + + case WDIOC_SETTIMEOUT: + if((ret = get_user(new_wdt_timeout, (int __user *)arg))) + break; + wdt_timeout = HEARTBEAT(new_wdt_timeout); + ar2315_wdt_enable(); + break; + + case WDIOC_GETTIMEOUT: + ret = put_user(wdt_timeout, (int __user *)arg); + break; + } + return ret; +} + +static struct file_operations ar2315_wdt_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .write = ar2315_wdt_write, + .ioctl = ar2315_wdt_ioctl, + .open = ar2315_wdt_open, + .release = ar2315_wdt_release, +}; + +static struct miscdevice ar2315_wdt_miscdev = { + .minor = WATCHDOG_MINOR, + .name = "watchdog", + .fops = &ar2315_wdt_fops, +}; + +static int +ar2315_wdt_probe(struct platform_device *dev) +{ + int ret = 0; + + ar2315_wdt_enable(); + ret = request_irq(AR531X_MISC_IRQ_WATCHDOG, ar2315_wdt_interrupt, IRQF_DISABLED, "ar2315_wdt", NULL); + if(ret) + { + printk(KERN_ERR "ar2315wdt: failed to register inetrrupt\n"); + goto out; + } + + ret = misc_register(&ar2315_wdt_miscdev); + if(ret) + printk(KERN_ERR "ar2315wdt: failed to register miscdev\n"); + +out: + return ret; +} + +static int +ar2315_wdt_remove(struct platform_device *dev) +{ + misc_deregister(&ar2315_wdt_miscdev); + free_irq(AR531X_MISC_IRQ_WATCHDOG, NULL); + return 0; +} + +static struct platform_driver ar2315_wdt_driver = { + .probe = ar2315_wdt_probe, + .remove = ar2315_wdt_remove, + .driver = { + .name = "ar2315_wdt", + .owner = THIS_MODULE, + }, +}; + +static int __init +init_ar2315_wdt(void) +{ + int ret = platform_driver_register(&ar2315_wdt_driver); + if(ret) + printk(KERN_INFO "ar2315_wdt: error registering platfom driver!"); + return ret; +} + +static void __exit +exit_ar2315_wdt(void) +{ + platform_driver_unregister(&ar2315_wdt_driver); +} + +module_init(init_ar2315_wdt); +module_exit(exit_ar2315_wdt); |