[PATCH] watchdog: mpc8xxx_wdt convert to watchdog core

Christophe Leroy
2013-11-30T15:33:49Z

Convert mpc8xxx_wdt.c to the new watchdog API.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

diff -ur a/drivers/watchdog/mpc8xxx_wdt.c b/drivers/watchdog/mpc8xxx_wdt.c
--- a/drivers/watchdog/mpc8xxx_wdt.c 2013-05-11 22:57:46.000000000 +0200
+++ b/drivers/watchdog/mpc8xxx_wdt.c 2013-11-30 16:14:53.803495472 +0100
@@ -72,28 +72,31 @@
* to 0
*/
static int prescale = 1;
-static unsigned int timeout_sec;

-static unsigned long wdt_is_open;
static DEFINE_SPINLOCK(wdt_spinlock);

-static void mpc8xxx_wdt_keepalive(void)
+static int mpc8xxx_wdt_ping(struct watchdog_device *w)
{
/* Ping the WDT */
spin_lock(&wdt_spinlock);
out_be16(&wd_base->swsrr, 0x556c);
out_be16(&wd_base->swsrr, 0xaa39);
spin_unlock(&wdt_spinlock);
+ return 0;
}

+static struct watchdog_device mpc8xxx_wdt_dev;
static void mpc8xxx_wdt_timer_ping(unsigned long arg);
-static DEFINE_TIMER(wdt_timer, mpc8xxx_wdt_timer_ping, 0, 0);
+static DEFINE_TIMER(wdt_timer, mpc8xxx_wdt_timer_ping, 0,
+ (unsigned long)&mpc8xxx_wdt_dev);

static void mpc8xxx_wdt_timer_ping(unsigned long arg)
{
- mpc8xxx_wdt_keepalive();
+ struct watchdog_device *w = (struct watchdog_device *)arg;
+
+ mpc8xxx_wdt_ping(w);
/* We're pinging it twice faster than needed, just to be sure. */
- mod_timer(&wdt_timer, jiffies + HZ * timeout_sec / 2);
+ mod_timer(&wdt_timer, jiffies + HZ * w->timeout / 2);
}

static void mpc8xxx_wdt_pr_warn(const char *msg)
@@ -102,19 +105,9 @@
reset ? "reset" : "machine check exception");
}

-static ssize_t mpc8xxx_wdt_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- if (count)
- mpc8xxx_wdt_keepalive();
- return count;
-}
-
-static int mpc8xxx_wdt_open(struct inode *inode, struct file *file)
+static int mpc8xxx_wdt_start(struct watchdog_device *w)
{
u32 tmp = SWCRR_SWEN;
- if (test_and_set_bit(0, &wdt_is_open))
- return -EBUSY;

/* Once we start the watchdog we can't stop it */
if (nowayout)
@@ -132,59 +125,30 @@

del_timer_sync(&wdt_timer);

- return nonseekable_open(inode, file);
+ return 0;
}

-static int mpc8xxx_wdt_release(struct inode *inode, struct file *file)
+static int mpc8xxx_wdt_stop(struct watchdog_device *w)
{
- if (!nowayout)
- mpc8xxx_wdt_timer_ping(0);
- else
- mpc8xxx_wdt_pr_warn("watchdog closed");
- clear_bit(0, &wdt_is_open);
+ mpc8xxx_wdt_timer_ping((unsigned long)w);
return 0;
}

-static long mpc8xxx_wdt_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- static const struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING,
- .firmware_version = 1,
- .identity = "MPC8xxx",
- };
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
- case WDIOC_KEEPALIVE:
- mpc8xxx_wdt_keepalive();
- return 0;
- case WDIOC_GETTIMEOUT:
- return put_user(timeout_sec, p);
- default:
- return -ENOTTY;
- }
-}
+static struct watchdog_info mpc8xxx_wdt_info = {
+ .options = WDIOF_KEEPALIVEPING,
+ .firmware_version = 1,
+ .identity = "MPC8xxx",
+};

-static const struct file_operations mpc8xxx_wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = mpc8xxx_wdt_write,
- .unlocked_ioctl = mpc8xxx_wdt_ioctl,
- .open = mpc8xxx_wdt_open,
- .release = mpc8xxx_wdt_release,
+static struct watchdog_ops mpc8xxx_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = mpc8xxx_wdt_start,
+ .stop = mpc8xxx_wdt_stop,
};

-static struct miscdevice mpc8xxx_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &mpc8xxx_wdt_fops,
+static struct watchdog_device mpc8xxx_wdt_dev = {
+ .info = &mpc8xxx_wdt_info,
+ .ops = &mpc8xxx_wdt_ops,
};

static const struct of_device_id mpc8xxx_wdt_match[];
@@ -196,6 +160,7 @@
const struct mpc8xxx_wdt_type *wdt_type;
u32 freq = fsl_get_sys_freq();
bool enabled;
+ unsigned int timeout_sec;

match = of_match_device(mpc8xxx_wdt_match, &ofdev->dev);
if (!match)
@@ -222,6 +187,7 @@
else
timeout_sec = timeout / freq;

+ mpc8xxx_wdt_dev.timeout = timeout_sec;
#ifdef MODULE
ret = mpc8xxx_wdt_init_late();
if (ret)
@@ -237,7 +203,7 @@
* userspace handles it.
*/
if (enabled)
- mpc8xxx_wdt_timer_ping(0);
+ mpc8xxx_wdt_timer_ping((unsigned long)&mpc8xxx_wdt_dev);
return 0;
err_unmap:
iounmap(wd_base);
@@ -249,7 +215,7 @@
{
mpc8xxx_wdt_pr_warn("watchdog removed");
del_timer_sync(&wdt_timer);
- misc_deregister(&mpc8xxx_wdt_miscdev);
+ watchdog_unregister_device(&mpc8xxx_wdt_dev);
iounmap(wd_base);

return 0;
@@ -301,10 +267,11 @@
if (!wd_base)
return -ENODEV;

- ret = misc_register(&mpc8xxx_wdt_miscdev);
+ watchdog_set_nowayout(&mpc8xxx_wdt_dev, nowayout);
+
+ ret = watchdog_register_device(&mpc8xxx_wdt_dev);
if (ret) {
- pr_err("cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
+ pr_err("cannot register watchdog device (err=%d)\n", ret);
return ret;
}
return 0;
diff -ur a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1146,6 +1146,7 @@
config 8xxx_WDT
tristate "MPC8xxx Platform Watchdog Timer"
depends on PPC_8xx || PPC_83xx || PPC_86xx
+ select WATCHDOG_CORE
help
This driver is for a SoC level watchdog that exists on some
Freescale PowerPC processors. So far this driver supports:

---
Ce courrier électronique ne contient aucun virus ou logiciel malveillant parce que la protection avast! Antivirus est active.