229 lines
5.5 KiB
Diff
229 lines
5.5 KiB
Diff
--- /dev/null
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+++ b/drivers/watchdog/ar2315-wtd.c
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@@ -0,0 +1,200 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ *
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+ * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
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+ * Based on EP93xx and ifxmips wdt driver
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+ */
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+
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+#include <linux/interrupt.h>
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+#include <linux/module.h>
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+#include <linux/moduleparam.h>
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+#include <linux/types.h>
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+#include <linux/miscdevice.h>
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+#include <linux/watchdog.h>
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+#include <linux/fs.h>
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+#include <linux/ioport.h>
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+#include <linux/notifier.h>
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+#include <linux/reboot.h>
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+#include <linux/init.h>
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+#include <linux/platform_device.h>
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+
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+#include <asm/io.h>
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+#include <asm/uaccess.h>
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+#include <asm/system.h>
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+#include <asm/addrspace.h>
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+#include <ar231x_platform.h>
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+#include <ar2315_regs.h>
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+#include <ar231x.h>
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+
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+#define CLOCK_RATE 40000000
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+#define HEARTBEAT(x) (x < 1 || x > 90)?(20):(x)
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+
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+static int wdt_timeout = 20;
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+static int started = 0;
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+static int in_use = 0;
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+
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+static void
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+ar2315_wdt_enable(void)
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+{
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+ ar231x_write_reg(AR2315_WD, wdt_timeout * CLOCK_RATE);
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+ ar231x_write_reg(AR2315_ISR, 0x80);
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+}
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+
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+static ssize_t
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+ar2315_wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos)
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+{
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+ if(len)
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+ ar2315_wdt_enable();
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+ return len;
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+}
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+
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+static int
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+ar2315_wdt_open(struct inode *inode, struct file *file)
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+{
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+ if(in_use)
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+ return -EBUSY;
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+ ar2315_wdt_enable();
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+ in_use = started = 1;
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+ return nonseekable_open(inode, file);
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+}
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+
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+static int
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+ar2315_wdt_release(struct inode *inode, struct file *file)
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+{
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+ in_use = 0;
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+ return 0;
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+}
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+
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+static irqreturn_t
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+ar2315_wdt_interrupt(int irq, void *dev_id)
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+{
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+ if(started)
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+ {
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+ printk(KERN_CRIT "watchdog expired, rebooting system\n");
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+ emergency_restart();
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+ } else {
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+ ar231x_write_reg(AR2315_WDC, 0);
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+ ar231x_write_reg(AR2315_WD, 0);
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+ ar231x_write_reg(AR2315_ISR, 0x80);
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+ }
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+ return IRQ_HANDLED;
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+}
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+
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+static struct watchdog_info ident = {
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+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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+ .identity = "ar2315 Watchdog",
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+};
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+
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+static long
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+ar2315_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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+{
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+ int new_wdt_timeout;
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+ int ret = -ENOIOCTLCMD;
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+
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+ switch(cmd)
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+ {
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+ case WDIOC_GETSUPPORT:
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+ ret = copy_to_user((struct watchdog_info __user *)arg, &ident, sizeof(ident)) ? -EFAULT : 0;
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+ break;
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+
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+ case WDIOC_KEEPALIVE:
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+ ar2315_wdt_enable();
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+ ret = 0;
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+ break;
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+
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+ case WDIOC_SETTIMEOUT:
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+ if((ret = get_user(new_wdt_timeout, (int __user *)arg)))
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+ break;
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+ wdt_timeout = HEARTBEAT(new_wdt_timeout);
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+ ar2315_wdt_enable();
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+ break;
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+
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+ case WDIOC_GETTIMEOUT:
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+ ret = put_user(wdt_timeout, (int __user *)arg);
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+ break;
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+ }
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+ return ret;
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+}
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+
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+static struct file_operations ar2315_wdt_fops = {
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+ .owner = THIS_MODULE,
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+ .llseek = no_llseek,
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+ .write = ar2315_wdt_write,
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+ .unlocked_ioctl = ar2315_wdt_ioctl,
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+ .open = ar2315_wdt_open,
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+ .release = ar2315_wdt_release,
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+};
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+
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+static struct miscdevice ar2315_wdt_miscdev = {
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+ .minor = WATCHDOG_MINOR,
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+ .name = "watchdog",
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+ .fops = &ar2315_wdt_fops,
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+};
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+
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+static int
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+ar2315_wdt_probe(struct platform_device *dev)
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+{
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+ int ret = 0;
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+
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+ ar2315_wdt_enable();
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+ ret = request_irq(AR531X_MISC_IRQ_WATCHDOG, ar2315_wdt_interrupt, IRQF_DISABLED, "ar2315_wdt", NULL);
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+ if(ret)
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+ {
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+ printk(KERN_ERR "ar2315wdt: failed to register inetrrupt\n");
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+ goto out;
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+ }
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+
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+ ret = misc_register(&ar2315_wdt_miscdev);
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+ if(ret)
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+ printk(KERN_ERR "ar2315wdt: failed to register miscdev\n");
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+
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+out:
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+ return ret;
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+}
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+
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+static int
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+ar2315_wdt_remove(struct platform_device *dev)
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+{
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+ misc_deregister(&ar2315_wdt_miscdev);
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+ free_irq(AR531X_MISC_IRQ_WATCHDOG, NULL);
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+ return 0;
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+}
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+
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+static struct platform_driver ar2315_wdt_driver = {
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+ .probe = ar2315_wdt_probe,
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+ .remove = ar2315_wdt_remove,
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+ .driver = {
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+ .name = "ar2315_wdt",
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+static int __init
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+init_ar2315_wdt(void)
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+{
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+ int ret = platform_driver_register(&ar2315_wdt_driver);
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+ if(ret)
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+ printk(KERN_INFO "ar2315_wdt: error registering platfom driver!");
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+ return ret;
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+}
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+
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+static void __exit
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+exit_ar2315_wdt(void)
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+{
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+ platform_driver_unregister(&ar2315_wdt_driver);
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+}
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+
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+module_init(init_ar2315_wdt);
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+module_exit(exit_ar2315_wdt);
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--- a/drivers/watchdog/Kconfig
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+++ b/drivers/watchdog/Kconfig
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@@ -1033,6 +1033,12 @@ config LANTIQ_WDT
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help
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Hardware driver for the Lantiq SoC Watchdog Timer.
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+config ATHEROS_WDT
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+ tristate "Atheros wisoc Watchdog Timer"
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+ depends on ATHEROS_AR231X
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+ help
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+ Hardware driver for the Atheros wisoc Watchdog Timer.
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+
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# PARISC Architecture
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# POWERPC Architecture
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--- a/drivers/watchdog/Makefile
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+++ b/drivers/watchdog/Makefile
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@@ -128,6 +128,7 @@ obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
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obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
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obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
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obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
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+obj-$(CONFIG_ATHEROS_WDT) += ar2315-wtd.o
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obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
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obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
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octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
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