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watchdog: mpc8xxx_wdt convert to watchdog core

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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>
This commit is contained in:
Christophe Leroy 2013-12-04 07:32:14 +01:00 committed by Wim Van Sebroeck
parent 15edd9eedd
commit d5cfaf0a85
2 changed files with 41 additions and 76 deletions
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1
drivers/watchdog/Kconfig
View File

@ -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:

108
drivers/watchdog/mpc8xxx_wdt.c
View File

@ -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);
mod_timer(&wdt_timer, jiffies + HZ * w->timeout / 2);
}
static void mpc8xxx_wdt_pr_warn(const char *msg)
{
pr_crit("%s, expect the %s soon!\n", msg,
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)
__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);
}
static int mpc8xxx_wdt_release(struct inode *inode, struct file *file)
{
if (!nowayout)
mpc8xxx_wdt_timer_ping(0);
else
mpc8xxx_wdt_pr_warn("watchdog closed");
clear_bit(0, &wdt_is_open);
return 0;
}
static long mpc8xxx_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
static int mpc8xxx_wdt_ping(struct watchdog_device *w)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
static const struct watchdog_info ident = {
mpc8xxx_wdt_keepalive();
return 0;
}
static int mpc8xxx_wdt_stop(struct watchdog_device *w)
{
mod_timer(&wdt_timer, jiffies);
return 0;
}
static struct watchdog_info mpc8xxx_wdt_info = {
.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 const struct file_operations mpc8xxx_wdt_fops = {
static struct watchdog_ops mpc8xxx_wdt_ops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = mpc8xxx_wdt_write,
.unlocked_ioctl = mpc8xxx_wdt_ioctl,
.open = mpc8xxx_wdt_open,
.release = mpc8xxx_wdt_release,
.start = mpc8xxx_wdt_start,
.ping = mpc8xxx_wdt_ping,
.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[];
@ -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 @@ static int mpc8xxx_wdt_probe(struct platform_device *ofdev)
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;