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path: root/drivers/watchdog/sc520_wdt.c
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Diffstat (limited to 'drivers/watchdog/sc520_wdt.c')
-rw-r--r--drivers/watchdog/sc520_wdt.c183
1 files changed, 92 insertions, 91 deletions
diff --git a/drivers/watchdog/sc520_wdt.c b/drivers/watchdog/sc520_wdt.c
index 2847324a2be..1cfd3f6a13d 100644
--- a/drivers/watchdog/sc520_wdt.c
+++ b/drivers/watchdog/sc520_wdt.c
@@ -1,8 +1,8 @@
/*
* AMD Elan SC520 processor Watchdog Timer driver
*
- * Based on acquirewdt.c by Alan Cox,
- * and sbc60xxwdt.c by Jakob Oestergaard <jakob@unthought.net>
+ * Based on acquirewdt.c by Alan Cox,
+ * and sbc60xxwdt.c by Jakob Oestergaard <jakob@unthought.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -11,7 +11,7 @@
*
* The authors do NOT admit liability nor provide warranty for
* any of this software. This material is provided "AS-IS" in
- * the hope that it may be useful for others.
+ * the hope that it may be useful for others.
*
* (c) Copyright 2001 Scott Jennings <linuxdrivers@oro.net>
* 9/27 - 2001 [Initial release]
@@ -52,6 +52,8 @@
* This driver uses memory mapped IO, and spinlock.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
@@ -64,13 +66,9 @@
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/jiffies.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-
-#define OUR_NAME "sc520_wdt"
-#define PFX OUR_NAME ": "
/*
* The AMD Elan SC520 timeout value is 492us times a power of 2 (0-7)
@@ -91,13 +89,18 @@
*/
#define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */
-static int timeout = WATCHDOG_TIMEOUT; /* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
+/* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
+static int timeout = WATCHDOG_TIMEOUT;
module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. (1 <= timeout <= 3600, default="
+ __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
-static int nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
/*
* AMD Elan SC520 - Watchdog Timer Registers
@@ -136,8 +139,7 @@ static void wdt_timer_ping(unsigned long data)
/* If we got a heartbeat pulse within the WDT_US_INTERVAL
* we agree to ping the WDT
*/
- if(time_before(jiffies, next_heartbeat))
- {
+ if (time_before(jiffies, next_heartbeat)) {
/* Ping the WDT */
spin_lock(&wdt_spinlock);
writew(0xAAAA, wdtmrctl);
@@ -146,9 +148,8 @@ static void wdt_timer_ping(unsigned long data)
/* Re-set the timer interval */
mod_timer(&timer, jiffies + WDT_INTERVAL);
- } else {
- printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
- }
+ } else
+ pr_warn("Heartbeat lost! Will not ping the watchdog\n");
}
/*
@@ -157,12 +158,11 @@ static void wdt_timer_ping(unsigned long data)
static void wdt_config(int writeval)
{
- __u16 dummy;
unsigned long flags;
/* buy some time (ping) */
spin_lock_irqsave(&wdt_spinlock, flags);
- dummy=readw(wdtmrctl); /* ensure write synchronization */
+ readw(wdtmrctl); /* ensure write synchronization */
writew(0xAAAA, wdtmrctl);
writew(0x5555, wdtmrctl);
/* unlock WDT = make WDT configuration register writable one time */
@@ -183,7 +183,7 @@ static int wdt_startup(void)
/* Start the watchdog */
wdt_config(WDT_ENB | WDT_WRST_ENB | WDT_EXP_SEL_04);
- printk(KERN_INFO PFX "Watchdog timer is now enabled.\n");
+ pr_info("Watchdog timer is now enabled\n");
return 0;
}
@@ -195,7 +195,7 @@ static int wdt_turnoff(void)
/* Stop the watchdog */
wdt_config(0);
- printk(KERN_INFO PFX "Watchdog timer is now disabled...\n");
+ pr_info("Watchdog timer is now disabled...\n");
return 0;
}
@@ -219,10 +219,11 @@ static int wdt_set_heartbeat(int t)
* /dev/watchdog handling
*/
-static ssize_t fop_write(struct file * file, const char __user * buf, size_t count, loff_t * ppos)
+static ssize_t fop_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
{
/* See if we got the magic character 'V' and reload the timer */
- if(count) {
+ if (count) {
if (!nowayout) {
size_t ofs;
@@ -231,25 +232,26 @@ static ssize_t fop_write(struct file * file, const char __user * buf, size_t cou
wdt_expect_close = 0;
/* now scan */
- for(ofs = 0; ofs != count; ofs++) {
+ for (ofs = 0; ofs != count; ofs++) {
char c;
if (get_user(c, buf + ofs))
return -EFAULT;
- if(c == 'V')
+ if (c == 'V')
wdt_expect_close = 42;
}
}
- /* Well, anyhow someone wrote to us, we should return that favour */
+ /* Well, anyhow someone wrote to us, we should
+ return that favour */
wdt_keepalive();
}
return count;
}
-static int fop_open(struct inode * inode, struct file * file)
+static int fop_open(struct inode *inode, struct file *file)
{
/* Just in case we're already talking to someone... */
- if(test_and_set_bit(0, &wdt_is_open))
+ if (test_and_set_bit(0, &wdt_is_open))
return -EBUSY;
if (nowayout)
__module_get(THIS_MODULE);
@@ -259,12 +261,12 @@ static int fop_open(struct inode * inode, struct file * file)
return nonseekable_open(inode, file);
}
-static int fop_close(struct inode * inode, struct file * file)
+static int fop_close(struct inode *inode, struct file *file)
{
- if(wdt_expect_close == 42) {
+ if (wdt_expect_close == 42)
wdt_turnoff();
- } else {
- printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+ else {
+ pr_crit("Unexpected close, not stopping watchdog!\n");
wdt_keepalive();
}
clear_bit(0, &wdt_is_open);
@@ -272,63 +274,62 @@ static int fop_close(struct inode * inode, struct file * file)
return 0;
}
-static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
+static long fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
- static struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+ static const struct watchdog_info ident = {
+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
+ | WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "SC520",
};
- switch(cmd)
+ 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_SETOPTIONS:
{
- default:
- return -ENOTTY;
- 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:
- wdt_keepalive();
- return 0;
- case WDIOC_SETOPTIONS:
- {
- int new_options, retval = -EINVAL;
-
- if(get_user(new_options, p))
- return -EFAULT;
-
- if(new_options & WDIOS_DISABLECARD) {
- wdt_turnoff();
- retval = 0;
- }
+ int new_options, retval = -EINVAL;
- if(new_options & WDIOS_ENABLECARD) {
- wdt_startup();
- retval = 0;
- }
+ if (get_user(new_options, p))
+ return -EFAULT;
- return retval;
+ if (new_options & WDIOS_DISABLECARD) {
+ wdt_turnoff();
+ retval = 0;
}
- case WDIOC_SETTIMEOUT:
- {
- int new_timeout;
- if(get_user(new_timeout, p))
- return -EFAULT;
+ if (new_options & WDIOS_ENABLECARD) {
+ wdt_startup();
+ retval = 0;
+ }
- if(wdt_set_heartbeat(new_timeout))
- return -EINVAL;
+ return retval;
+ }
+ case WDIOC_KEEPALIVE:
+ wdt_keepalive();
+ return 0;
+ case WDIOC_SETTIMEOUT:
+ {
+ int new_timeout;
- wdt_keepalive();
- /* Fall through */
- }
- case WDIOC_GETTIMEOUT:
- return put_user(timeout, p);
+ if (get_user(new_timeout, p))
+ return -EFAULT;
+
+ if (wdt_set_heartbeat(new_timeout))
+ return -EINVAL;
+
+ wdt_keepalive();
+ /* Fall through */
+ }
+ case WDIOC_GETTIMEOUT:
+ return put_user(timeout, p);
+ default:
+ return -ENOTTY;
}
}
@@ -338,7 +339,7 @@ static const struct file_operations wdt_fops = {
.write = fop_write,
.open = fop_open,
.release = fop_close,
- .ioctl = fop_ioctl,
+ .unlocked_ioctl = fop_ioctl,
};
static struct miscdevice wdt_miscdev = {
@@ -354,7 +355,7 @@ static struct miscdevice wdt_miscdev = {
static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
- if(code==SYS_DOWN || code==SYS_HALT)
+ if (code == SYS_DOWN || code == SYS_HALT)
wdt_turnoff();
return NOTIFY_DONE;
}
@@ -383,36 +384,36 @@ static int __init sc520_wdt_init(void)
{
int rc = -EBUSY;
- /* Check that the timeout value is within it's range ; if not reset to the default */
+ /* Check that the timeout value is within it's range ;
+ if not reset to the default */
if (wdt_set_heartbeat(timeout)) {
wdt_set_heartbeat(WATCHDOG_TIMEOUT);
- printk(KERN_INFO PFX "timeout value must be 1<=timeout<=3600, using %d\n",
+ pr_info("timeout value must be 1 <= timeout <= 3600, using %d\n",
WATCHDOG_TIMEOUT);
}
- wdtmrctl = ioremap((unsigned long)(MMCR_BASE + OFFS_WDTMRCTL), 2);
+ wdtmrctl = ioremap(MMCR_BASE + OFFS_WDTMRCTL, 2);
if (!wdtmrctl) {
- printk(KERN_ERR PFX "Unable to remap memory\n");
+ pr_err("Unable to remap memory\n");
rc = -ENOMEM;
goto err_out_region2;
}
rc = register_reboot_notifier(&wdt_notifier);
if (rc) {
- printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
- rc);
+ pr_err("cannot register reboot notifier (err=%d)\n", rc);
goto err_out_ioremap;
}
rc = misc_register(&wdt_miscdev);
if (rc) {
- printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, rc);
+ pr_err("cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, rc);
goto err_out_notifier;
}
- printk(KERN_INFO PFX "WDT driver for SC520 initialised. timeout=%d sec (nowayout=%d)\n",
- timeout,nowayout);
+ pr_info("WDT driver for SC520 initialised. timeout=%d sec (nowayout=%d)\n",
+ timeout, nowayout);
return 0;
@@ -428,6 +429,6 @@ module_init(sc520_wdt_init);
module_exit(sc520_wdt_unload);
MODULE_AUTHOR("Scott and Bill Jennings");
-MODULE_DESCRIPTION("Driver for watchdog timer in AMD \"Elan\" SC520 uProcessor");
+MODULE_DESCRIPTION(
+ "Driver for watchdog timer in AMD \"Elan\" SC520 uProcessor");
MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-09 06:27:09 +0000