* 2 of the License, or (at your option) any later version.
*/
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
+#include <linux/bitops.h>
+#include <linux/errno.h>
#include <linux/fs.h>
-#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/reboot.h>
-#include <linux/smp_lock.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
+#include <linux/types.h>
#include <linux/uaccess.h>
+#include <linux/watchdog.h>
#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/resource.h>
+#include <linux/platform_device.h>
#include <bcm63xx_cpu.h>
#include <bcm63xx_io.h>
#define PFX KBUILD_MODNAME
#define WDT_HZ 50000000 /* Fclk */
-#define WDT_INTERVAL (40) /* in seconds */
+#define WDT_DEFAULT_TIME 30 /* seconds */
+#define WDT_MAX_TIME 256 /* seconds */
static struct {
void __iomem *regs;
- struct completion stop;
- int running;
struct timer_list timer;
- int queue;
int default_ticks;
unsigned long inuse;
+ atomic_t ticks;
} bcm63xx_wdt_device;
-static int ticks = 100 * WDT_HZ;
-
static int expect_close;
static int timeout;
+static int wdt_time = WDT_DEFAULT_TIME;
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-
-static void bcm63xx_wdt_toggle(void)
+/* HW functions */
+static void bcm63xx_wdt_hw_start(void)
{
+ bcm_writel(0xffffffff, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
bcm_writel(WDT_START_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
bcm_writel(WDT_START_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
}
-static void bcm63xx_wdt_start(void)
+static void bcm63xx_wdt_hw_stop(void)
{
- if (!bcm63xx_wdt_device.inuse) {
- bcm63xx_wdt_toggle();
- mod_timer(&bcm63xx_wdt_device.timer, jiffies + WDT_INTERVAL);
- }
-
- bcm63xx_wdt_device.running++;
+ bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+ bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
}
-static void bcm63xx_wdt_stop(void)
+static void bcm63xx_timer_tick(unsigned long unused)
{
- if (bcm63xx_wdt_device.running) {
- bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
- bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+ if (!atomic_dec_and_test(&bcm63xx_wdt_device.ticks)) {
+ bcm63xx_wdt_hw_start();
+ mod_timer(&bcm63xx_wdt_device.timer, jiffies + HZ);
+ } else
+ printk(KERN_CRIT PFX ": watchdog will restart system\n");
+}
- bcm63xx_wdt_device.running = 0;
- }
+static void bcm63xx_wdt_pet(void)
+{
+ atomic_set(&bcm63xx_wdt_device.ticks, wdt_time);
}
-static void bcm63xx_wdt_set(int new_timeout)
+static void bcm63xx_wdt_start(void)
{
- new_timeout *= WDT_HZ;
- bcm_writel(new_timeout, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
+ bcm63xx_wdt_pet();
+ bcm63xx_timer_tick(0);
}
-static void bcm63xx_wdt_reset(void)
+static void bcm63xx_wdt_pause(void)
{
- ticks = bcm63xx_wdt_device.default_ticks;
+ del_timer_sync(&bcm63xx_wdt_device.timer);
+ bcm63xx_wdt_hw_stop();
}
-static void bcm63xx_wdt_update(unsigned long unused)
+static int bcm63xx_wdt_settimeout(int new_time)
{
- if (bcm63xx_wdt_device.running)
- ticks--;
+ if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
+ return -EINVAL;
- bcm63xx_wdt_toggle();
+ wdt_time = new_time;
- if (bcm63xx_wdt_device.queue && ticks)
- mod_timer(&bcm63xx_wdt_device.timer,
- jiffies + WDT_INTERVAL);
- else
- complete(&bcm63xx_wdt_device.stop);
+ return 0;
}
static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
return -EBUSY;
- if (nowayout)
- __module_get(THIS_MODULE);
-
+ bcm63xx_wdt_start();
return nonseekable_open(inode, file);
}
static int bcm63xx_wdt_release(struct inode *inode, struct file *file)
{
- if (expect_close && nowayout == 0) {
- bcm63xx_wdt_stop();
- printk(KERN_INFO PFX ": disabling watchdog timer\n");
- module_put(THIS_MODULE);
- } else
+ if (expect_close == 42)
+ bcm63xx_wdt_pause();
+ else {
printk(KERN_CRIT PFX
- ": device closed unexpectedly. WDT will not stop !\n");
-
+ ": Unexpected close, not stopping watchdog!\n");
+ bcm63xx_wdt_start();
+ }
clear_bit(0, &bcm63xx_wdt_device.inuse);
+ expect_close = 0;
return 0;
}
if (get_user(c, data + i))
return -EFAULT;
if (c == 'V')
- expect_close = 1;
+ expect_close = 42;
}
}
- bcm63xx_wdt_update(0);
- return len;
+ bcm63xx_wdt_pet();
}
- return 0;
+ return len;
}
+static struct watchdog_info bcm63xx_wdt_info = {
+ .identity = PFX,
+ .options = WDIOF_SETTIMEOUT |
+ WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE,
+};
+
+
static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
- int new_timeout;
- unsigned int value;
- static struct watchdog_info ident = {
- .options = WDIOF_SETTIMEOUT |
- WDIOF_KEEPALIVEPING |
- WDIOF_MAGICCLOSE,
- .identity = "BCM63xx Watchdog",
- };
+ int __user *p = argp;
+ int new_value, retval = -EINVAL;
+
switch (cmd) {
- case WDIOC_KEEPALIVE:
- bcm63xx_wdt_reset();
- break;
+ case WDIOC_GETSUPPORT:
+ return copy_to_user(argp, &bcm63xx_wdt_info,
+ sizeof(bcm63xx_wdt_info)) ? -EFAULT : 0;
+
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
- value = bcm_readl(bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
- if (copy_to_user(argp, &value, sizeof(int)))
- return -EFAULT;
- break;
- case WDIOC_GETSUPPORT:
- if (copy_to_user(argp, &ident, sizeof(ident)))
- return -EFAULT;
- break;
+ return put_user(0, p);
+
case WDIOC_SETOPTIONS:
- if (copy_from_user(&value, argp, sizeof(int)))
+ if (get_user(new_value, p))
return -EFAULT;
- switch (value) {
- case WDIOS_ENABLECARD:
+
+ if (new_value & WDIOS_DISABLECARD) {
+ bcm63xx_wdt_pause();
+ retval = 0;
+ }
+ if (new_value & WDIOS_ENABLECARD) {
bcm63xx_wdt_start();
- break;
- case WDIOS_DISABLECARD:
- bcm63xx_wdt_stop();
- default:
- return -EINVAL;
+ retval = 0;
}
- break;
+
+ return retval;
+
+ case WDIOC_KEEPALIVE:
+ bcm63xx_wdt_pet();
+ return 0;
+
case WDIOC_SETTIMEOUT:
- if (copy_from_user(&new_timeout, argp, sizeof(int)))
+ if (get_user(new_value, p))
return -EFAULT;
- if (new_timeout < 5)
- return -EINVAL;
- if (new_timeout > 40)
+
+ if (bcm63xx_wdt_settimeout(new_value))
return -EINVAL;
- bcm63xx_wdt_set(new_timeout);
- bcm63xx_wdt_toggle();
+
+ bcm63xx_wdt_pet();
+
case WDIOC_GETTIMEOUT:
- return copy_to_user(argp, &timeout, sizeof(int));
+ return put_user(wdt_time, p);
+
default:
return -ENOTTY;
+
}
+}
- return 0;
+static int bcm63xx_wdt_notify_sys(struct notifier_block *this,
+ unsigned long code, void *unused)
+{
+ if (code == SYS_DOWN || code == SYS_HALT)
+ bcm63xx_wdt_pause();
+ return NOTIFY_DONE;
}
-static struct file_operations bcm63xx_wdt_fops = {
+static const struct file_operations bcm63xx_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = bcm63xx_wdt_write,
.fops = &bcm63xx_wdt_fops,
};
+static struct notifier_block bcm63xx_wdt_notifier = {
+ .notifier_call = bcm63xx_wdt_notify_sys,
+};
+
+
static int bcm63xx_wdt_probe(struct platform_device *pdev)
{
int ret;
struct resource *r;
+ setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_timer_tick, 0L);
+
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
- printk(KERN_ERR PFX
+ printk(KERN_ERR PFX
"failed to retrieve resources\n");
return -ENODEV;
}
return -ENXIO;
}
+ if (bcm63xx_wdt_settimeout(wdt_time)) {
+ bcm63xx_wdt_settimeout(WDT_DEFAULT_TIME);
+ printk(KERN_INFO PFX
+ ": wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
+ wdt_time);
+ }
+
+ ret = register_reboot_notifier(&bcm63xx_wdt_notifier);
+ if (ret) {
+ printk(KERN_ERR PFX
+ "failed to register reboot_notifier\n");
+ return ret;
+ }
+
ret = misc_register(&bcm63xx_wdt_miscdev);
if (ret < 0) {
printk(KERN_ERR PFX
goto unmap;
}
- init_completion(&bcm63xx_wdt_device.stop);
- bcm63xx_wdt_device.queue = 0;
-
- clear_bit(0, &bcm63xx_wdt_device.inuse);
-
- setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_wdt_update, 0L);
-
- bcm63xx_wdt_device.default_ticks = ticks;
- bcm63xx_wdt_set(ticks);
- bcm63xx_wdt_start();
-
- printk(KERN_INFO PFX " started, timer margin: %d sec\n", WDT_INTERVAL);
+ printk(KERN_INFO PFX " started, timer margin: %d sec\n", WDT_DEFAULT_TIME);
return 0;
unmap:
+ unregister_reboot_notifier(&bcm63xx_wdt_notifier);
iounmap(bcm63xx_wdt_device.regs);
return ret;
}
static int bcm63xx_wdt_remove(struct platform_device *pdev)
{
- if (bcm63xx_wdt_device.queue) {
- bcm63xx_wdt_device.queue = 0;
- wait_for_completion(&bcm63xx_wdt_device.stop);
- }
+ if (!nowayout)
+ bcm63xx_wdt_pause();
misc_deregister(&bcm63xx_wdt_miscdev);
iounmap(bcm63xx_wdt_device.regs);
+ unregister_reboot_notifier(&bcm63xx_wdt_notifier);
+
return 0;
}
projects / openwrt.git / blobdiff