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path: root/drivers/watchdog/at91rm9200_wdt.c
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Diffstat (limited to 'drivers/watchdog/at91rm9200_wdt.c')
-rw-r--r--drivers/watchdog/at91rm9200_wdt.c151
1 files changed, 81 insertions, 70 deletions
diff --git a/drivers/watchdog/at91rm9200_wdt.c b/drivers/watchdog/at91rm9200_wdt.c
index 9ff9a956532..dee6cc21d27 100644
--- a/drivers/watchdog/at91rm9200_wdt.c
+++ b/drivers/watchdog/at91rm9200_wdt.c
@@ -9,10 +9,13 @@
* 2 of the License, or (at your option) any later version.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
+#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
@@ -20,22 +23,26 @@
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/watchdog.h>
-#include <asm/uaccess.h>
-#include <asm/arch/at91_st.h>
-
+#include <linux/uaccess.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <mach/at91_st.h>
#define WDT_DEFAULT_TIME 5 /* seconds */
#define WDT_MAX_TIME 256 /* seconds */
static int wdt_time = WDT_DEFAULT_TIME;
-static int nowayout = WATCHDOG_NOWAYOUT;
+static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(wdt_time, int, 0);
-MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="__MODULE_STRING(WDT_DEFAULT_TIME) ")");
+MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
+ __MODULE_STRING(WDT_DEFAULT_TIME) ")");
#ifdef CONFIG_WATCHDOG_NOWAYOUT
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
#endif
@@ -46,26 +53,27 @@ static unsigned long at91wdt_busy;
/*
* Disable the watchdog.
*/
-static void inline at91_wdt_stop(void)
+static inline void at91_wdt_stop(void)
{
- at91_sys_write(AT91_ST_WDMR, AT91_ST_EXTEN);
+ at91_st_write(AT91_ST_WDMR, AT91_ST_EXTEN);
}
/*
* Enable and reset the watchdog.
*/
-static void inline at91_wdt_start(void)
+static inline void at91_wdt_start(void)
{
- at91_sys_write(AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN | (((65536 * wdt_time) >> 8) & AT91_ST_WDV));
- at91_sys_write(AT91_ST_CR, AT91_ST_WDRST);
+ at91_st_write(AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN |
+ (((65536 * wdt_time) >> 8) & AT91_ST_WDV));
+ at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
}
/*
* Reload the watchdog timer. (ie, pat the watchdog)
*/
-static void inline at91_wdt_reload(void)
+static inline void at91_wdt_reload(void)
{
- at91_sys_write(AT91_ST_CR, AT91_ST_WDRST);
+ at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
}
/* ......................................................................... */
@@ -89,8 +97,9 @@ static int at91_wdt_open(struct inode *inode, struct file *file)
*/
static int at91_wdt_close(struct inode *inode, struct file *file)
{
+ /* Disable the watchdog when file is closed */
if (!nowayout)
- at91_wdt_stop(); /* Disable the watchdog when file is closed */
+ at91_wdt_stop();
clear_bit(0, &at91wdt_busy);
return 0;
@@ -102,20 +111,21 @@ static int at91_wdt_close(struct inode *inode, struct file *file)
static int at91_wdt_settimeout(int new_time)
{
/*
- * All counting occurs at SLOW_CLOCK / 128 = 0.256 Hz
+ * All counting occurs at SLOW_CLOCK / 128 = 256 Hz
*
* Since WDV is a 16-bit counter, the maximum period is
- * 65536 / 0.256 = 256 seconds.
+ * 65536 / 256 = 256 seconds.
*/
if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
return -EINVAL;
- /* Set new watchdog time. It will be used when at91_wdt_start() is called. */
+ /* Set new watchdog time. It will be used when
+ at91_wdt_start() is called. */
wdt_time = new_time;
return 0;
}
-static struct watchdog_info at91_wdt_info = {
+static const struct watchdog_info at91_wdt_info = {
.identity = "at91 watchdog",
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
};
@@ -123,60 +133,52 @@ static struct watchdog_info at91_wdt_info = {
/*
* Handle commands from user-space.
*/
-static int at91_wdt_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long at91_wdt_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_value;
- switch(cmd) {
- case WDIOC_KEEPALIVE:
- at91_wdt_reload(); /* pat the watchdog */
- return 0;
-
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &at91_wdt_info, sizeof(at91_wdt_info)) ? -EFAULT : 0;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_value, p))
- return -EFAULT;
-
- if (at91_wdt_settimeout(new_value))
- return -EINVAL;
-
- /* Enable new time value */
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ return copy_to_user(argp, &at91_wdt_info,
+ sizeof(at91_wdt_info)) ? -EFAULT : 0;
+ case WDIOC_GETSTATUS:
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(0, p);
+ case WDIOC_SETOPTIONS:
+ if (get_user(new_value, p))
+ return -EFAULT;
+ if (new_value & WDIOS_DISABLECARD)
+ at91_wdt_stop();
+ if (new_value & WDIOS_ENABLECARD)
at91_wdt_start();
-
- /* Return current value */
- return put_user(wdt_time, p);
-
- case WDIOC_GETTIMEOUT:
- return put_user(wdt_time, p);
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
-
- case WDIOC_SETOPTIONS:
- if (get_user(new_value, p))
- return -EFAULT;
-
- if (new_value & WDIOS_DISABLECARD)
- at91_wdt_stop();
- if (new_value & WDIOS_ENABLECARD)
- at91_wdt_start();
- return 0;
-
- default:
- return -ENOTTY;
+ return 0;
+ case WDIOC_KEEPALIVE:
+ at91_wdt_reload(); /* pat the watchdog */
+ return 0;
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_value, p))
+ return -EFAULT;
+ if (at91_wdt_settimeout(new_value))
+ return -EINVAL;
+ /* Enable new time value */
+ at91_wdt_start();
+ /* Return current value */
+ return put_user(wdt_time, p);
+ case WDIOC_GETTIMEOUT:
+ return put_user(wdt_time, p);
+ default:
+ return -ENOTTY;
}
}
/*
* Pat the watchdog whenever device is written to.
*/
-static ssize_t at91_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+static ssize_t at91_wdt_write(struct file *file, const char *data,
+ size_t len, loff_t *ppos)
{
at91_wdt_reload(); /* pat the watchdog */
return len;
@@ -187,7 +189,7 @@ static ssize_t at91_wdt_write(struct file *file, const char *data, size_t len, l
static const struct file_operations at91wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
- .ioctl = at91_wdt_ioctl,
+ .unlocked_ioctl = at91_wdt_ioctl,
.open = at91_wdt_open,
.release = at91_wdt_close,
.write = at91_wdt_write,
@@ -199,7 +201,7 @@ static struct miscdevice at91wdt_miscdev = {
.fops = &at91wdt_fops,
};
-static int __init at91wdt_probe(struct platform_device *pdev)
+static int at91wdt_probe(struct platform_device *pdev)
{
int res;
@@ -211,11 +213,12 @@ static int __init at91wdt_probe(struct platform_device *pdev)
if (res)
return res;
- printk("AT91 Watchdog Timer enabled (%d seconds%s)\n", wdt_time, nowayout ? ", nowayout" : "");
+ pr_info("AT91 Watchdog Timer enabled (%d seconds%s)\n",
+ wdt_time, nowayout ? ", nowayout" : "");
return 0;
}
-static int __exit at91wdt_remove(struct platform_device *pdev)
+static int at91wdt_remove(struct platform_device *pdev)
{
int res;
@@ -243,7 +246,7 @@ static int at91wdt_resume(struct platform_device *pdev)
{
if (at91wdt_busy)
at91_wdt_start();
- return 0;
+ return 0;
}
#else
@@ -251,24 +254,33 @@ static int at91wdt_resume(struct platform_device *pdev)
#define at91wdt_resume NULL
#endif
+static const struct of_device_id at91_wdt_dt_ids[] = {
+ { .compatible = "atmel,at91rm9200-wdt" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, at91_wdt_dt_ids);
+
static struct platform_driver at91wdt_driver = {
.probe = at91wdt_probe,
- .remove = __exit_p(at91wdt_remove),
+ .remove = at91wdt_remove,
.shutdown = at91wdt_shutdown,
.suspend = at91wdt_suspend,
.resume = at91wdt_resume,
.driver = {
.name = "at91_wdt",
.owner = THIS_MODULE,
+ .of_match_table = at91_wdt_dt_ids,
},
};
static int __init at91_wdt_init(void)
{
- /* Check that the heartbeat value is within range; if not reset to the default */
+ /* Check that the heartbeat value is within range;
+ if not reset to the default */
if (at91_wdt_settimeout(wdt_time)) {
at91_wdt_settimeout(WDT_DEFAULT_TIME);
- pr_info("at91_wdt: wdt_time value must be 1 <= wdt_time <= 256, using %d\n", wdt_time);
+ pr_info("wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
+ wdt_time);
}
return platform_driver_register(&at91wdt_driver);
@@ -285,5 +297,4 @@ module_exit(at91_wdt_exit);
MODULE_AUTHOR("Andrew Victor");
MODULE_DESCRIPTION("Watchdog driver for Atmel AT91RM9200");
MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
MODULE_ALIAS("platform:at91_wdt");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-25 09:22:41 +0000