--- /dev/null
+--- /dev/null
++++ b/drivers/watchdog/ar2315-wtd.c
+@@ -0,0 +1,199 @@
++/*
++ * 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/addrspace.h>
++#include <ar231x_platform.h>
++#include <ar2315_regs.h>
++#include <ar231x.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)
++{
++ ar231x_write_reg(AR2315_WD, wdt_timeout * CLOCK_RATE);
++ ar231x_write_reg(AR2315_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 {
++ ar231x_write_reg(AR2315_WDC, 0);
++ ar231x_write_reg(AR2315_WD, 0);
++ ar231x_write_reg(AR2315_ISR, 0x80);
++ }
++ return IRQ_HANDLED;
++}
++
++static struct watchdog_info ident = {
++ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
++ .identity = "ar2315 Watchdog",
++};
++
++static long
++ar2315_wdt_ioctl(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,
++ .unlocked_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);
+--- a/drivers/watchdog/Kconfig
++++ b/drivers/watchdog/Kconfig
+@@ -1064,6 +1064,12 @@ config LANTIQ_WDT
+ help
+ Hardware driver for the Lantiq SoC Watchdog Timer.
+
++config ATHEROS_WDT
++ tristate "Atheros wisoc Watchdog Timer"
++ depends on ATHEROS_AR231X
++ help
++ Hardware driver for the Atheros wisoc Watchdog Timer.
++
+ # PARISC Architecture
+
+ # POWERPC Architecture
+--- a/drivers/watchdog/Makefile
++++ b/drivers/watchdog/Makefile
+@@ -128,6 +128,7 @@ obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
+ obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
+ obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
+ obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
++obj-$(CONFIG_ATHEROS_WDT) += ar2315-wtd.o
+ obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
+ obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
+ octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
projects / openwrt.git / blobdiff