* [PATCH v2] watchdog: mpc8xxx_wdt convert to watchdog core
@ 2013-12-03 13:31 Christophe Leroy
2013-12-04 5:10 ` Guenter Roeck
0 siblings, 1 reply; 2+ messages in thread
From: Christophe Leroy @ 2013-12-03 13:31 UTC (permalink / raw)
To: Wim Van Sebroeck, scottwood, Guenter Roeck
Cc: linuxppc-dev, linux-kernel, linux-watchdog
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
@@ -72,53 +72,36 @@
* 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();
- /* We're pinging it twice faster than needed, just to be sure. */
- mod_timer(&wdt_timer, jiffies + HZ * timeout_sec / 2);
-}
+ struct watchdog_device *w = (struct watchdog_device *)arg;
-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;
+ mpc8xxx_wdt_ping(w);
+ /* We're pinging it twice faster than needed, just to be sure. */
+ mod_timer(&wdt_timer, jiffies + HZ * w->timeout / 2);
}
-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)
@@ -132,59 +115,31 @@
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);
+ mod_timer(&wdt_timer, jiffies);
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,
+ .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[];
@@ -196,6 +151,7 @@
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 +178,7 @@
else
timeout_sec = timeout / freq;
+ mpc8xxx_wdt_dev.timeout = timeout_sec;
#ifdef MODULE
ret = mpc8xxx_wdt_init_late();
if (ret)
@@ -237,7 +194,7 @@
* userspace handles it.
*/
if (enabled)
- mpc8xxx_wdt_timer_ping(0);
+ mod_timer(&wdt_timer, jiffies);
return 0;
err_unmap:
iounmap(wd_base);
@@ -247,9 +204,10 @@
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;
@@ -301,10 +259,11 @@
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:
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH v2] watchdog: mpc8xxx_wdt convert to watchdog core
2013-12-03 13:31 [PATCH v2] watchdog: mpc8xxx_wdt convert to watchdog core Christophe Leroy
@ 2013-12-04 5:10 ` Guenter Roeck
0 siblings, 0 replies; 2+ messages in thread
From: Guenter Roeck @ 2013-12-04 5:10 UTC (permalink / raw)
To: Christophe Leroy, Wim Van Sebroeck, scottwood
Cc: linuxppc-dev, linux-kernel, linux-watchdog
On 12/03/2013 05:31 AM, Christophe Leroy wrote:
> 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
> @@ -72,53 +72,36 @@
> * 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;
> }
>
Ok, now I understand a bit better.
I think it would be better to keep the original mpc8xxx_wdt_keepalive()
function and add
static int mpc8xxx_wdt_ping(struct watchdog_device *w)
{
mpc8xxx_wdt_keepalive();
}
since the parameter is not used. Then you can call mpc8xxx_wdt_keepalive()
from mpc8xxx_wdt_timer_ping(), and you don't have to add the dummy argument.
Otherwise looks good.
Note there is a problem in the probe function with
u32 freq = fsl_get_sys_freq();
and
if (!freq || freq == -1)
^^^^^^^^^^^
but fixing that would be a different patch.
Guenter
> +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();
> - /* We're pinging it twice faster than needed, just to be sure. */
> - mod_timer(&wdt_timer, jiffies + HZ * timeout_sec / 2);
> -}
> + struct watchdog_device *w = (struct watchdog_device *)arg;
>
> -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;
> + mpc8xxx_wdt_ping(w);
> + /* We're pinging it twice faster than needed, just to be sure. */
> + mod_timer(&wdt_timer, jiffies + HZ * w->timeout / 2);
> }
>
> -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)
> @@ -132,59 +115,31 @@
>
> 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);
> + mod_timer(&wdt_timer, jiffies);
> 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,
> + .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[];
> @@ -196,6 +151,7 @@
> 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 +178,7 @@
> else
> timeout_sec = timeout / freq;
>
> + mpc8xxx_wdt_dev.timeout = timeout_sec;
> #ifdef MODULE
> ret = mpc8xxx_wdt_init_late();
> if (ret)
> @@ -237,7 +194,7 @@
> * userspace handles it.
> */
> if (enabled)
> - mpc8xxx_wdt_timer_ping(0);
> + mod_timer(&wdt_timer, jiffies);
> return 0;
> err_unmap:
> iounmap(wd_base);
> @@ -247,9 +204,10 @@
>
> 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;
> @@ -301,10 +259,11 @@
> 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:
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-12-03 13:31 [PATCH v2] watchdog: mpc8xxx_wdt convert to watchdog core Christophe Leroy
2013-12-04 5:10 ` Guenter Roeck
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