#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
#include <linux/watchdog.h>
#include <linux/init.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/spinlock.h>
+#include <plat/orion5x_wdt.h>
/*
* Watchdog timer block registers.
#define WDT_EN 0x0010
#define WDT_VAL (TIMER_VIRT_BASE + 0x0024)
-#define ORION5X_TCLK 166666667
-#define WDT_MAX_DURATION (0xffffffff / ORION5X_TCLK)
+#define WDT_MAX_CYCLE_COUNT 0xffffffff
#define WDT_IN_USE 0
#define WDT_OK_TO_CLOSE 1
static int nowayout = WATCHDOG_NOWAYOUT;
-static int heartbeat = WDT_MAX_DURATION; /* (seconds) */
+static int heartbeat = -1; /* module parameter (seconds) */
+static unsigned int wdt_max_duration; /* (seconds) */
+static unsigned int wdt_tclk;
static unsigned long wdt_status;
static spinlock_t wdt_lock;
-static void wdt_enable(void)
+static void orion5x_wdt_ping(void)
+{
+ spin_lock(&wdt_lock);
+
+ /* Reload watchdog duration */
+ writel(wdt_tclk * heartbeat, WDT_VAL);
+
+ spin_unlock(&wdt_lock);
+}
+
+static void orion5x_wdt_enable(void)
{
u32 reg;
spin_lock(&wdt_lock);
/* Set watchdog duration */
- writel(ORION5X_TCLK * heartbeat, WDT_VAL);
+ writel(wdt_tclk * heartbeat, WDT_VAL);
/* Clear watchdog timer interrupt */
reg = readl(BRIDGE_CAUSE);
spin_unlock(&wdt_lock);
}
-static void wdt_disable(void)
+static void orion5x_wdt_disable(void)
{
u32 reg;
static int orion5x_wdt_get_timeleft(int *time_left)
{
spin_lock(&wdt_lock);
- *time_left = readl(WDT_VAL) / ORION5X_TCLK;
+ *time_left = readl(WDT_VAL) / wdt_tclk;
spin_unlock(&wdt_lock);
return 0;
}
if (test_and_set_bit(WDT_IN_USE, &wdt_status))
return -EBUSY;
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
- wdt_enable();
+ orion5x_wdt_enable();
return nonseekable_open(inode, file);
}
set_bit(WDT_OK_TO_CLOSE, &wdt_status);
}
}
- wdt_enable();
+ orion5x_wdt_ping();
}
return len;
}
-static struct watchdog_info ident = {
+static int orion5x_wdt_settimeout(int new_time)
+{
+ if ((new_time <= 0) || (new_time > wdt_max_duration))
+ return -EINVAL;
+
+ /* Set new watchdog time to be used when
+ * orion5x_wdt_enable() or orion5x_wdt_ping() is called. */
+ heartbeat = new_time;
+ return 0;
+}
+
+static const struct watchdog_info ident = {
.options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING,
.identity = "Orion5x Watchdog",
};
-
static long orion5x_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
break;
case WDIOC_KEEPALIVE:
- wdt_enable();
+ orion5x_wdt_ping();
ret = 0;
break;
if (ret)
break;
- if (time <= 0 || time > WDT_MAX_DURATION) {
+ if (orion5x_wdt_settimeout(time)) {
ret = -EINVAL;
break;
}
- heartbeat = time;
- wdt_enable();
+ orion5x_wdt_ping();
/* Fall through */
case WDIOC_GETTIMEOUT:
static int orion5x_wdt_release(struct inode *inode, struct file *file)
{
if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
- wdt_disable();
+ orion5x_wdt_disable();
else
printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - "
"timer will not stop\n");
.fops = &orion5x_wdt_fops,
};
-static int __init orion5x_wdt_init(void)
+static int __devinit orion5x_wdt_probe(struct platform_device *pdev)
{
+ struct orion5x_wdt_platform_data *pdata = pdev->dev.platform_data;
int ret;
- spin_lock_init(&wdt_lock);
+ if (pdata) {
+ wdt_tclk = pdata->tclk;
+ } else {
+ printk(KERN_ERR "Orion5x Watchdog misses platform data\n");
+ return -ENODEV;
+ }
+
+ if (orion5x_wdt_miscdev.parent)
+ return -EBUSY;
+ orion5x_wdt_miscdev.parent = &pdev->dev;
+
+ wdt_max_duration = WDT_MAX_CYCLE_COUNT / wdt_tclk;
+ if (orion5x_wdt_settimeout(heartbeat))
+ heartbeat = wdt_max_duration;
ret = misc_register(&orion5x_wdt_miscdev);
- if (ret == 0)
- printk("Orion5x Watchdog Timer: heartbeat %d sec\n",
- heartbeat);
+ if (ret)
+ return ret;
+
+ printk(KERN_INFO "Orion5x Watchdog Timer: Initial timeout %d sec%s\n",
+ heartbeat, nowayout ? ", nowayout" : "");
+ return 0;
+}
+
+static int __devexit orion5x_wdt_remove(struct platform_device *pdev)
+{
+ int ret;
+
+ if (test_bit(WDT_IN_USE, &wdt_status)) {
+ orion5x_wdt_disable();
+ clear_bit(WDT_IN_USE, &wdt_status);
+ }
+
+ ret = misc_deregister(&orion5x_wdt_miscdev);
+ if (!ret)
+ orion5x_wdt_miscdev.parent = NULL;
return ret;
}
+static void orion5x_wdt_shutdown(struct platform_device *pdev)
+{
+ if (test_bit(WDT_IN_USE, &wdt_status))
+ orion5x_wdt_disable();
+}
+
+static struct platform_driver orion5x_wdt_driver = {
+ .probe = orion5x_wdt_probe,
+ .remove = __devexit_p(orion5x_wdt_remove),
+ .shutdown = orion5x_wdt_shutdown,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "orion5x_wdt",
+ },
+};
+
+static int __init orion5x_wdt_init(void)
+{
+ spin_lock_init(&wdt_lock);
+ return platform_driver_register(&orion5x_wdt_driver);
+}
+
static void __exit orion5x_wdt_exit(void)
{
- misc_deregister(&orion5x_wdt_miscdev);
+ platform_driver_unregister(&orion5x_wdt_driver);
}
module_init(orion5x_wdt_init);
MODULE_DESCRIPTION("Orion5x Processor Watchdog");
module_param(heartbeat, int, 0);
-MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default is "
- __MODULE_STRING(WDT_MAX_DURATION) ")");
+MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds");
module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
projects / mv-sheeva.git / blobdiff