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authorChristophe Leroy <christophe.leroy@c-s.fr>2013-12-04 07:32:14 +0100
committerWim Van Sebroeck <wim@iguana.be>2014-01-28 21:27:08 +0100
commitd5cfaf0a8554ad6b0e74955c7217ed24b2cadc9b (patch)
tree0a69d7903427f72591173202fa9c33e867262844 /drivers/watchdog
parent15edd9eedd61ac7be53d63ffa6a7208d4479cece (diff)
downloadop-kernel-dev-d5cfaf0a8554ad6b0e74955c7217ed24b2cadc9b.zip
op-kernel-dev-d5cfaf0a8554ad6b0e74955c7217ed24b2cadc9b.tar.gz
watchdog: mpc8xxx_wdt convert to watchdog core
Convert mpc8xxx_wdt.c to the new watchdog API. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/Kconfig1
-rw-r--r--drivers/watchdog/mpc8xxx_wdt.c110
2 files changed, 38 insertions, 73 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 833ebe6..8cb4f3d 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1202,6 +1202,7 @@ config MPC5200_WDT
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:
diff --git a/drivers/watchdog/mpc8xxx_wdt.c b/drivers/watchdog/mpc8xxx_wdt.c
index d821520..c1f65b4 100644
--- a/drivers/watchdog/mpc8xxx_wdt.c
+++ b/drivers/watchdog/mpc8xxx_wdt.c
@@ -73,9 +73,7 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
* 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)
@@ -87,39 +85,23 @@ static void mpc8xxx_wdt_keepalive(void)
spin_unlock(&wdt_spinlock);
}
+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)
{
+ struct watchdog_device *w = (struct watchdog_device *)arg;
+
mpc8xxx_wdt_keepalive();
/* We're pinging it twice faster than needed, just to be sure. */
- mod_timer(&wdt_timer, jiffies + HZ * timeout_sec / 2);
-}
-
-static void mpc8xxx_wdt_pr_warn(const char *msg)
-{
- pr_crit("%s, expect the %s soon!\n", msg,
- reset ? "reset" : "machine check exception");
+ mod_timer(&wdt_timer, jiffies + HZ * w->timeout / 2);
}
-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)
- __module_get(THIS_MODULE);
/* Good, fire up the show */
if (prescale)
@@ -133,59 +115,37 @@ static int mpc8xxx_wdt_open(struct inode *inode, struct file *file)
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_ping(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_keepalive();
return 0;
}
-static long mpc8xxx_wdt_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
+static int mpc8xxx_wdt_stop(struct watchdog_device *w)
{
- 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;
- }
+ mod_timer(&wdt_timer, jiffies);
+ return 0;
}
-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_info mpc8xxx_wdt_info = {
+ .options = WDIOF_KEEPALIVEPING,
+ .firmware_version = 1,
+ .identity = "MPC8xxx",
};
-static struct miscdevice mpc8xxx_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &mpc8xxx_wdt_fops,
+static struct watchdog_ops mpc8xxx_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = mpc8xxx_wdt_start,
+ .ping = mpc8xxx_wdt_ping,
+ .stop = mpc8xxx_wdt_stop,
+};
+
+static struct watchdog_device mpc8xxx_wdt_dev = {
+ .info = &mpc8xxx_wdt_info,
+ .ops = &mpc8xxx_wdt_ops,
};
static const struct of_device_id mpc8xxx_wdt_match[];
@@ -197,6 +157,7 @@ static int mpc8xxx_wdt_probe(struct platform_device *ofdev)
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)
@@ -223,6 +184,7 @@ static int mpc8xxx_wdt_probe(struct platform_device *ofdev)
else
timeout_sec = timeout / freq;
+ mpc8xxx_wdt_dev.timeout = timeout_sec;
#ifdef MODULE
ret = mpc8xxx_wdt_init_late();
if (ret)
@@ -238,7 +200,7 @@ static int mpc8xxx_wdt_probe(struct platform_device *ofdev)
* userspace handles it.
*/
if (enabled)
- mpc8xxx_wdt_timer_ping(0);
+ mod_timer(&wdt_timer, jiffies);
return 0;
err_unmap:
iounmap(wd_base);
@@ -248,9 +210,10 @@ err_unmap:
static int mpc8xxx_wdt_remove(struct platform_device *ofdev)
{
- mpc8xxx_wdt_pr_warn("watchdog removed");
+ pr_crit("Watchdog removed, expect the %s soon!\n",
+ reset ? "reset" : "machine check exception");
del_timer_sync(&wdt_timer);
- misc_deregister(&mpc8xxx_wdt_miscdev);
+ watchdog_unregister_device(&mpc8xxx_wdt_dev);
iounmap(wd_base);
return 0;
@@ -302,10 +265,11 @@ static int mpc8xxx_wdt_init_late(void)
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;
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