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path: root/drivers/watchdog/sb_wdog.c
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Diffstat (limited to 'drivers/watchdog/sb_wdog.c')
-rw-r--r--drivers/watchdog/sb_wdog.c120
1 files changed, 64 insertions, 56 deletions
diff --git a/drivers/watchdog/sb_wdog.c b/drivers/watchdog/sb_wdog.c
index b9443143369..3abae50773b 100644
--- a/drivers/watchdog/sb_wdog.c
+++ b/drivers/watchdog/sb_wdog.c
@@ -1,7 +1,7 @@
/*
* Watchdog driver for SiByte SB1 SoCs
*
- * Copyright (C) 2007 OnStor, Inc. * Andrew Sharp <andy.sharp@onstor.com>
+ * Copyright (C) 2007 OnStor, Inc. * Andrew Sharp <andy.sharp@lsi.com>
*
* This driver is intended to make the second of two hardware watchdogs
* on the Sibyte 12XX and 11XX SoCs available to the user. There are two
@@ -35,14 +35,17 @@
* Based on various other watchdog drivers, which are probably all
* loosely based on something Alan Cox wrote years ago.
*
- * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
- * http://www.redhat.com
+ * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
+ * All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 1 or 2 as published by the Free Software Foundation.
*
*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/io.h>
#include <linux/uaccess.h>
@@ -57,6 +60,7 @@
#include <asm/sibyte/sb1250_int.h>
#include <asm/sibyte/sb1250_scd.h>
+static DEFINE_SPINLOCK(sbwd_lock);
/*
* set the initial count value of a timer
@@ -65,8 +69,10 @@
*/
void sbwdog_set(char __iomem *wdog, unsigned long t)
{
- __raw_writeb(0, wdog - 0x10);
- __raw_writeq(t & 0x7fffffUL, wdog);
+ spin_lock(&sbwd_lock);
+ __raw_writeb(0, wdog);
+ __raw_writeq(t & 0x7fffffUL, wdog - 0x10);
+ spin_unlock(&sbwd_lock);
}
/*
@@ -77,7 +83,9 @@ void sbwdog_set(char __iomem *wdog, unsigned long t)
*/
void sbwdog_pet(char __iomem *wdog)
{
+ spin_lock(&sbwd_lock);
__raw_writeb(__raw_readb(wdog) | 1, wdog);
+ spin_unlock(&sbwd_lock);
}
static unsigned long sbwdog_gate; /* keeps it to one thread only */
@@ -86,8 +94,9 @@ static char __iomem *user_dog = (char __iomem *)(IO_BASE + (A_SCD_WDOG_CFG_1));
static unsigned long timeout = 0x7fffffUL; /* useconds: 8.3ish secs. */
static int expect_close;
-static struct watchdog_info ident = {
- .options = WDIOF_CARDRESET | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+static const struct watchdog_info ident = {
+ .options = WDIOF_CARDRESET | WDIOF_SETTIMEOUT |
+ WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
.identity = "SiByte Watchdog",
};
@@ -97,9 +106,8 @@ static struct watchdog_info ident = {
static int sbwdog_open(struct inode *inode, struct file *file)
{
nonseekable_open(inode, file);
- if (test_and_set_bit(0, &sbwdog_gate)) {
+ if (test_and_set_bit(0, &sbwdog_gate))
return -EBUSY;
- }
__module_get(THIS_MODULE);
/*
@@ -120,7 +128,7 @@ static int sbwdog_release(struct inode *inode, struct file *file)
__raw_writeb(0, user_dog);
module_put(THIS_MODULE);
} else {
- printk(KERN_CRIT "%s: Unexpected close, not stopping watchdog!\n",
+ pr_crit("%s: Unexpected close, not stopping watchdog!\n",
ident.identity);
sbwdog_pet(user_dog);
}
@@ -147,12 +155,10 @@ static ssize_t sbwdog_write(struct file *file, const char __user *data,
for (i = 0; i != len; i++) {
char c;
- if (get_user(c, data + i)) {
+ if (get_user(c, data + i))
return -EFAULT;
- }
- if (c == 'V') {
+ if (c == 'V')
expect_close = 42;
- }
}
sbwdog_pet(user_dog);
}
@@ -160,8 +166,8 @@ static ssize_t sbwdog_write(struct file *file, const char __user *data,
return len;
}
-static int sbwdog_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long sbwdog_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
{
int ret = -ENOTTY;
unsigned long time;
@@ -178,11 +184,15 @@ static int sbwdog_ioctl(struct inode *inode, struct file *file,
ret = put_user(0, p);
break;
+ case WDIOC_KEEPALIVE:
+ sbwdog_pet(user_dog);
+ ret = 0;
+ break;
+
case WDIOC_SETTIMEOUT:
ret = get_user(time, p);
- if (ret) {
+ if (ret)
break;
- }
time *= 1000000;
if (time > 0x7fffffUL) {
@@ -198,12 +208,7 @@ static int sbwdog_ioctl(struct inode *inode, struct file *file,
* get the remaining count from the ... count register
* which is 1*8 before the config register
*/
- ret = put_user(__raw_readq(user_dog - 8) / 1000000, p);
- break;
-
- case WDIOC_KEEPALIVE:
- sbwdog_pet(user_dog);
- ret = 0;
+ ret = put_user((u32)__raw_readq(user_dog - 8) / 1000000, p);
break;
}
return ret;
@@ -212,8 +217,8 @@ static int sbwdog_ioctl(struct inode *inode, struct file *file,
/*
* Notifier for system down
*/
-static int
-sbwdog_notify_sys(struct notifier_block *this, unsigned long code, void *erf)
+static int sbwdog_notify_sys(struct notifier_block *this, unsigned long code,
+ void *erf)
{
if (code == SYS_DOWN || code == SYS_HALT) {
/*
@@ -226,18 +231,16 @@ sbwdog_notify_sys(struct notifier_block *this, unsigned long code, void *erf)
return NOTIFY_DONE;
}
-static const struct file_operations sbwdog_fops =
-{
+static const struct file_operations sbwdog_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = sbwdog_write,
- .ioctl = sbwdog_ioctl,
+ .unlocked_ioctl = sbwdog_ioctl,
.open = sbwdog_open,
.release = sbwdog_release,
};
-static struct miscdevice sbwdog_miscdev =
-{
+static struct miscdevice sbwdog_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &sbwdog_fops,
@@ -267,13 +270,13 @@ irqreturn_t sbwdog_interrupt(int irq, void *addr)
/*
* if it's the second watchdog timer, it's for those users
*/
- if (wd_cfg_reg == user_dog) {
- printk(KERN_CRIT
- "%s in danger of initiating system reset in %ld.%01ld seconds\n",
- ident.identity, wd_init / 1000000, (wd_init / 100000) % 10);
- } else {
+ if (wd_cfg_reg == user_dog)
+ pr_crit("%s in danger of initiating system reset "
+ "in %ld.%01ld seconds\n",
+ ident.identity,
+ wd_init / 1000000, (wd_init / 100000) % 10);
+ else
cfg |= 1;
- }
__raw_writeb(cfg, wd_cfg_reg);
@@ -289,27 +292,33 @@ static int __init sbwdog_init(void)
*/
ret = register_reboot_notifier(&sbwdog_notifier);
if (ret) {
- printk (KERN_ERR "%s: cannot register reboot notifier (err=%d)\n",
- ident.identity, ret);
+ pr_err("%s: cannot register reboot notifier (err=%d)\n",
+ ident.identity, ret);
return ret;
}
/*
* get the resources
*/
- ret = misc_register(&sbwdog_miscdev);
- if (ret == 0) {
- printk(KERN_INFO "%s: timeout is %ld.%ld secs\n", ident.identity,
- timeout / 1000000, (timeout / 100000) % 10);
- }
- ret = request_irq(1, sbwdog_interrupt, IRQF_DISABLED | IRQF_SHARED,
+ ret = request_irq(1, sbwdog_interrupt, IRQF_SHARED,
ident.identity, (void *)user_dog);
if (ret) {
- printk(KERN_ERR "%s: failed to request irq 1 - %d\n", ident.identity,
- ret);
- misc_deregister(&sbwdog_miscdev);
+ pr_err("%s: failed to request irq 1 - %d\n",
+ ident.identity, ret);
+ goto out;
+ }
+
+ ret = misc_register(&sbwdog_miscdev);
+ if (ret == 0) {
+ pr_info("%s: timeout is %ld.%ld secs\n",
+ ident.identity,
+ timeout / 1000000, (timeout / 100000) % 10);
+ return 0;
}
+ free_irq(1, (void *)user_dog);
+out:
+ unregister_reboot_notifier(&sbwdog_notifier);
return ret;
}
@@ -317,35 +326,34 @@ static int __init sbwdog_init(void)
static void __exit sbwdog_exit(void)
{
misc_deregister(&sbwdog_miscdev);
+ free_irq(1, (void *)user_dog);
+ unregister_reboot_notifier(&sbwdog_notifier);
}
module_init(sbwdog_init);
module_exit(sbwdog_exit);
-MODULE_AUTHOR("Andrew Sharp <andy.sharp@onstor.com>");
+MODULE_AUTHOR("Andrew Sharp <andy.sharp@lsi.com>");
MODULE_DESCRIPTION("SiByte Watchdog");
module_param(timeout, ulong, 0);
MODULE_PARM_DESC(timeout,
- "Watchdog timeout in microseconds (max/default 8388607 or 8.3ish secs)");
+ "Watchdog timeout in microseconds (max/default 8388607 or 8.3ish secs)");
MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
/*
* example code that can be put in a platform code area to utilize the
* first watchdog timer for the kernels own purpose.
- void
-platform_wd_setup(void)
+void platform_wd_setup(void)
{
int ret;
- ret = request_irq(0, sbwdog_interrupt, IRQF_DISABLED | IRQF_SHARED,
+ ret = request_irq(1, sbwdog_interrupt, IRQF_SHARED,
"Kernel Watchdog", IOADDR(A_SCD_WDOG_CFG_0));
if (ret) {
- printk(KERN_CRIT "Watchdog IRQ zero(0) failed to be requested - %d\n",
- ret);
+ pr_crit("Watchdog IRQ zero(0) failed to be requested - %d\n", ret);
}
}
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