1 files changed, 286 insertions, 0 deletions

diff --git a/drivers/watchdog/bcm47xx_wdt.c b/drivers/watchdog/bcm47xx_wdt.c
new file mode 100644
index 000000000000..5c7011cda6a6
--- /dev/null
+++ b/drivers/watchdog/bcm47xx_wdt.c
@@ -0,0 +1,286 @@
+/*
+ *  Watchdog driver for Broadcom BCM47XX
+ *
+ *  Copyright (C) 2008 Aleksandar Radovanovic <biblbroks@sezampro.rs>
+ *  Copyright (C) 2009 Matthieu CASTET <castet.matthieu@free.fr>
+ *
+ *  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.
+ */
+
+#include <linux/bitops.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/reboot.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/watchdog.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/ssb/ssb_embedded.h>
+#include <asm/mach-bcm47xx/bcm47xx.h>
+
+#define DRV_NAME                "bcm47xx_wdt"
+
+#define WDT_DEFAULT_TIME        30      /* seconds */
+#define WDT_MAX_TIME            255     /* seconds */
+
+static int wdt_time = WDT_DEFAULT_TIME;
+static int nowayout = WATCHDOG_NOWAYOUT;
+
+module_param(wdt_time, int, 0);
+MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
+                                __MODULE_STRING(WDT_DEFAULT_TIME) ")");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout,
+                "Watchdog cannot be stopped once started (default="
+                                __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+#endif
+
+static unsigned long bcm47xx_wdt_busy;
+static char expect_release;
+static struct timer_list wdt_timer;
+static atomic_t ticks;
+
+static inline void bcm47xx_wdt_hw_start(void)
+{
+        /* this is 2,5s on 100Mhz clock  and 2s on 133 Mhz */
+        ssb_watchdog_timer_set(&ssb_bcm47xx, 0xfffffff);
+}
+
+static inline int bcm47xx_wdt_hw_stop(void)
+{
+        return ssb_watchdog_timer_set(&ssb_bcm47xx, 0);
+}
+
+static void bcm47xx_timer_tick(unsigned long unused)
+{
+        if (!atomic_dec_and_test(&ticks)) {
+                bcm47xx_wdt_hw_start();
+                mod_timer(&wdt_timer, jiffies + HZ);
+        } else {
+                printk(KERN_CRIT DRV_NAME "Watchdog will fire soon!!!\n");
+        }
+}
+
+static inline void bcm47xx_wdt_pet(void)
+{
+        atomic_set(&ticks, wdt_time);
+}
+
+static void bcm47xx_wdt_start(void)
+{
+        bcm47xx_wdt_pet();
+        bcm47xx_timer_tick(0);
+}
+
+static void bcm47xx_wdt_pause(void)
+{
+        del_timer_sync(&wdt_timer);
+        bcm47xx_wdt_hw_stop();
+}
+
+static void bcm47xx_wdt_stop(void)
+{
+        bcm47xx_wdt_pause();
+}
+
+static int bcm47xx_wdt_settimeout(int new_time)
+{
+        if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
+                return -EINVAL;
+
+        wdt_time = new_time;
+        return 0;
+}
+
+static int bcm47xx_wdt_open(struct inode *inode, struct file *file)
+{
+        if (test_and_set_bit(0, &bcm47xx_wdt_busy))
+                return -EBUSY;
+
+        bcm47xx_wdt_start();
+        return nonseekable_open(inode, file);
+}
+
+static int bcm47xx_wdt_release(struct inode *inode, struct file *file)
+{
+        if (expect_release == 42) {
+                bcm47xx_wdt_stop();
+        } else {
+                printk(KERN_CRIT DRV_NAME
+                        ": Unexpected close, not stopping watchdog!\n");
+                bcm47xx_wdt_start();
+        }
+
+        clear_bit(0, &bcm47xx_wdt_busy);
+        expect_release = 0;
+        return 0;
+}
+
+static ssize_t bcm47xx_wdt_write(struct file *file, const char __user *data,
+                                size_t len, loff_t *ppos)
+{
+        if (len) {
+                if (!nowayout) {
+                        size_t i;
+
+                        expect_release = 0;
+
+                        for (i = 0; i != len; i++) {
+                                char c;
+                                if (get_user(c, data + i))
+                                        return -EFAULT;
+                                if (c == 'V')
+                                        expect_release = 42;
+                        }
+                }
+                bcm47xx_wdt_pet();
+        }
+        return len;
+}
+
+static struct watchdog_info bcm47xx_wdt_info = {
+        .identity       = DRV_NAME,
+        .options        = WDIOF_SETTIMEOUT |
+                                WDIOF_KEEPALIVEPING |
+                                WDIOF_MAGICCLOSE,
+};
+
+static long bcm47xx_wdt_ioctl(struct file *file,
+                                        unsigned int cmd, unsigned long arg)
+{
+        void __user *argp = (void __user *)arg;
+        int __user *p = argp;
+        int new_value, retval = -EINVAL;;
+
+        switch (cmd) {
+        case WDIOC_GETSUPPORT:
+                return copy_to_user(argp, &bcm47xx_wdt_info,
+                                sizeof(bcm47xx_wdt_info)) ? -EFAULT : 0;
+
+        case WDIOC_GETSTATUS:
+        case WDIOC_GETBOOTSTATUS:
+                return put_user(0, p);
+
+        case WDIOC_SETOPTIONS:
+                if (get_user(new_value, p))
+                        return -EFAULT;
+
+                if (new_value & WDIOS_DISABLECARD) {
+                        bcm47xx_wdt_stop();
+                        retval = 0;
+                }
+
+                if (new_value & WDIOS_ENABLECARD) {
+                        bcm47xx_wdt_start();
+                        retval = 0;
+                }
+
+                return retval;
+
+        case WDIOC_KEEPALIVE:
+                bcm47xx_wdt_pet();
+                return 0;
+
+        case WDIOC_SETTIMEOUT:
+                if (get_user(new_value, p))
+                        return -EFAULT;
+
+                if (bcm47xx_wdt_settimeout(new_value))
+                        return -EINVAL;
+
+                bcm47xx_wdt_pet();
+
+        case WDIOC_GETTIMEOUT:
+                return put_user(wdt_time, p);
+
+        default:
+                return -ENOTTY;
+        }
+}
+
+static int bcm47xx_wdt_notify_sys(struct notifier_block *this,
+        unsigned long code, void *unused)
+{
+        if (code == SYS_DOWN || code == SYS_HALT)
+                bcm47xx_wdt_stop();
+        return NOTIFY_DONE;
+}
+
+static const struct file_operations bcm47xx_wdt_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .unlocked_ioctl = bcm47xx_wdt_ioctl,
+        .open           = bcm47xx_wdt_open,
+        .release        = bcm47xx_wdt_release,
+        .write          = bcm47xx_wdt_write,
+};
+
+static struct miscdevice bcm47xx_wdt_miscdev = {
+        .minor          = WATCHDOG_MINOR,
+        .name           = "watchdog",
+        .fops           = &bcm47xx_wdt_fops,
+};
+
+static struct notifier_block bcm47xx_wdt_notifier = {
+        .notifier_call = bcm47xx_wdt_notify_sys,
+};
+
+static int __init bcm47xx_wdt_init(void)
+{
+        int ret;
+
+        if (bcm47xx_wdt_hw_stop() < 0)
+                return -ENODEV;
+
+        setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
+
+        if (bcm47xx_wdt_settimeout(wdt_time)) {
+                bcm47xx_wdt_settimeout(WDT_DEFAULT_TIME);
+                printk(KERN_INFO DRV_NAME ": "
+                        "wdt_time value must be 0 < wdt_time < %d, using %d\n",
+                        (WDT_MAX_TIME + 1), wdt_time);
+        }
+
+        ret = register_reboot_notifier(&bcm47xx_wdt_notifier);
+        if (ret)
+                return ret;
+
+        ret = misc_register(&bcm47xx_wdt_miscdev);
+        if (ret) {
+                unregister_reboot_notifier(&bcm47xx_wdt_notifier);
+                return ret;
+        }
+
+        printk(KERN_INFO "BCM47xx Watchdog Timer enabled (%d seconds%s)\n",
+                                wdt_time, nowayout ? ", nowayout" : "");
+        return 0;
+}
+
+static void __exit bcm47xx_wdt_exit(void)
+{
+        if (!nowayout)
+                bcm47xx_wdt_stop();
+
+        misc_deregister(&bcm47xx_wdt_miscdev);
+
+        unregister_reboot_notifier(&bcm47xx_wdt_notifier);
+}
+
+module_init(bcm47xx_wdt_init);
+module_exit(bcm47xx_wdt_exit);
+
+MODULE_AUTHOR("Aleksandar Radovanovic");
+MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);