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path: root/drivers/watchdog/geodewdt.c
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Diffstat (limited to 'drivers/watchdog/geodewdt.c')
-rw-r--r--drivers/watchdog/geodewdt.c174
1 files changed, 81 insertions, 93 deletions
diff --git a/drivers/watchdog/geodewdt.c b/drivers/watchdog/geodewdt.c
index 30d09cbbad9..4c43e3fa8bd 100644
--- a/drivers/watchdog/geodewdt.c
+++ b/drivers/watchdog/geodewdt.c
@@ -1,6 +1,7 @@
-/* Watchdog timer for the Geode GX/LX with the CS5535/CS5536 companion chip
+/* Watchdog timer for machines with the CS5535/CS5536 companion chip
*
* Copyright (C) 2006-2007, Advanced Micro Devices, Inc.
+ * Copyright (C) 2009 Andres Salomon <dilinger@collabora.co.uk>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -8,6 +9,7 @@
* 2 of the License, or (at your option) any later version.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/moduleparam.h>
@@ -17,9 +19,9 @@
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
+#include <linux/uaccess.h>
-#include <asm/uaccess.h>
-#include <asm/geode.h>
+#include <linux/cs5535.h>
#define GEODEWDT_HZ 500
#define GEODEWDT_SCALE 6
@@ -34,33 +36,37 @@
static int timeout = WATCHDOG_TIMEOUT;
module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=131, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. 1<= timeout <=131, 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) ")");
static struct platform_device *geodewdt_platform_device;
static unsigned long wdt_flags;
-static int wdt_timer;
+static struct cs5535_mfgpt_timer *wdt_timer;
static int safe_close;
static void geodewdt_ping(void)
{
/* Stop the counter */
- geode_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0);
+ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0);
/* Reset the counter */
- geode_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0);
+ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0);
/* Enable the counter */
- geode_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, MFGPT_SETUP_CNTEN);
+ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, MFGPT_SETUP_CNTEN);
}
static void geodewdt_disable(void)
{
- geode_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0);
- geode_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0);
+ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0);
+ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0);
}
static int geodewdt_set_heartbeat(int val)
@@ -68,37 +74,34 @@ static int geodewdt_set_heartbeat(int val)
if (val < 1 || val > GEODEWDT_MAX_SECONDS)
return -EINVAL;
- geode_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0);
- geode_mfgpt_write(wdt_timer, MFGPT_REG_CMP2, val * GEODEWDT_HZ);
- geode_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0);
- geode_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, MFGPT_SETUP_CNTEN);
+ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0);
+ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_CMP2, val * GEODEWDT_HZ);
+ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0);
+ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, MFGPT_SETUP_CNTEN);
timeout = val;
return 0;
}
-static int
-geodewdt_open(struct inode *inode, struct file *file)
+static int geodewdt_open(struct inode *inode, struct file *file)
{
- if (test_and_set_bit(WDT_FLAGS_OPEN, &wdt_flags))
- return -EBUSY;
+ if (test_and_set_bit(WDT_FLAGS_OPEN, &wdt_flags))
+ return -EBUSY;
- if (!test_and_clear_bit(WDT_FLAGS_ORPHAN, &wdt_flags))
- __module_get(THIS_MODULE);
+ if (!test_and_clear_bit(WDT_FLAGS_ORPHAN, &wdt_flags))
+ __module_get(THIS_MODULE);
geodewdt_ping();
- return nonseekable_open(inode, file);
+ return nonseekable_open(inode, file);
}
-static int
-geodewdt_release(struct inode *inode, struct file *file)
+static int geodewdt_release(struct inode *inode, struct file *file)
{
if (safe_close) {
geodewdt_disable();
module_put(THIS_MODULE);
- }
- else {
- printk(KERN_CRIT "Unexpected close - watchdog is not stopping.\n");
+ } else {
+ pr_crit("Unexpected close - watchdog is not stopping\n");
geodewdt_ping();
set_bit(WDT_FLAGS_ORPHAN, &wdt_flags);
@@ -109,11 +112,10 @@ geodewdt_release(struct inode *inode, struct file *file)
return 0;
}
-static ssize_t
-geodewdt_write(struct file *file, const char __user *data, size_t len,
- loff_t *ppos)
+static ssize_t geodewdt_write(struct file *file, const char __user *data,
+ size_t len, loff_t *ppos)
{
- if(len) {
+ if (len) {
if (!nowayout) {
size_t i;
safe_close = 0;
@@ -134,22 +136,21 @@ geodewdt_write(struct file *file, const char __user *data, size_t len,
return len;
}
-static int
-geodewdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
+static long geodewdt_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int interval;
- static struct watchdog_info ident = {
+ static const struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING
| WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = WATCHDOG_NAME,
- };
+ };
- switch(cmd) {
+ switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ident,
sizeof(ident)) ? -EFAULT : 0;
@@ -159,22 +160,6 @@ geodewdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
- case WDIOC_KEEPALIVE:
- geodewdt_ping();
- return 0;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(interval, p))
- return -EFAULT;
-
- if (geodewdt_set_heartbeat(interval))
- return -EINVAL;
-
-/* Fall through */
-
- case WDIOC_GETTIMEOUT:
- return put_user(timeout, p);
-
case WDIOC_SETOPTIONS:
{
int options, ret = -EINVAL;
@@ -194,6 +179,20 @@ geodewdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
return ret;
}
+ case WDIOC_KEEPALIVE:
+ geodewdt_ping();
+ return 0;
+
+ case WDIOC_SETTIMEOUT:
+ if (get_user(interval, p))
+ return -EFAULT;
+
+ if (geodewdt_set_heartbeat(interval))
+ return -EINVAL;
+ /* Fall through */
+ case WDIOC_GETTIMEOUT:
+ return put_user(timeout, p);
+
default:
return -ENOTTY;
}
@@ -202,45 +201,41 @@ geodewdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
}
static const struct file_operations geodewdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = geodewdt_write,
- .ioctl = geodewdt_ioctl,
- .open = geodewdt_open,
- .release = geodewdt_release,
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = geodewdt_write,
+ .unlocked_ioctl = geodewdt_ioctl,
+ .open = geodewdt_open,
+ .release = geodewdt_release,
};
static struct miscdevice geodewdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
- .fops = &geodewdt_fops
+ .fops = &geodewdt_fops,
};
-static int __devinit
-geodewdt_probe(struct platform_device *dev)
+static int __init geodewdt_probe(struct platform_device *dev)
{
- int ret, timer;
-
- timer = geode_mfgpt_alloc_timer(MFGPT_TIMER_ANY, MFGPT_DOMAIN_WORKING);
+ int ret;
- if (timer == -1) {
- printk(KERN_ERR "geodewdt: No timers were available\n");
+ wdt_timer = cs5535_mfgpt_alloc_timer(MFGPT_TIMER_ANY, MFGPT_DOMAIN_WORKING);
+ if (!wdt_timer) {
+ pr_err("No timers were available\n");
return -ENODEV;
}
- wdt_timer = timer;
-
/* Set up the timer */
- geode_mfgpt_write(wdt_timer, MFGPT_REG_SETUP,
+ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP,
GEODEWDT_SCALE | (3 << 8));
/* Set up comparator 2 to reset when the event fires */
- geode_mfgpt_toggle_event(wdt_timer, MFGPT_CMP2, MFGPT_EVENT_RESET, 1);
+ cs5535_mfgpt_toggle_event(wdt_timer, MFGPT_CMP2, MFGPT_EVENT_RESET, 1);
/* Set up the initial timeout */
- geode_mfgpt_write(wdt_timer, MFGPT_REG_CMP2,
+ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_CMP2,
timeout * GEODEWDT_HZ);
ret = misc_register(&geodewdt_miscdev);
@@ -248,22 +243,19 @@ geodewdt_probe(struct platform_device *dev)
return ret;
}
-static int __devexit
-geodewdt_remove(struct platform_device *dev)
+static int geodewdt_remove(struct platform_device *dev)
{
misc_deregister(&geodewdt_miscdev);
return 0;
}
-static void
-geodewdt_shutdown(struct platform_device *dev)
+static void geodewdt_shutdown(struct platform_device *dev)
{
geodewdt_disable();
}
static struct platform_driver geodewdt_driver = {
- .probe = geodewdt_probe,
- .remove = __devexit_p(geodewdt_remove),
+ .remove = geodewdt_remove,
.shutdown = geodewdt_shutdown,
.driver = {
.owner = THIS_MODULE,
@@ -271,29 +263,26 @@ static struct platform_driver geodewdt_driver = {
},
};
-static int __init
-geodewdt_init(void)
+static int __init geodewdt_init(void)
{
int ret;
- ret = platform_driver_register(&geodewdt_driver);
- if (ret)
- return ret;
+ geodewdt_platform_device = platform_device_register_simple(DRV_NAME,
+ -1, NULL, 0);
+ if (IS_ERR(geodewdt_platform_device))
+ return PTR_ERR(geodewdt_platform_device);
- geodewdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
- if (IS_ERR(geodewdt_platform_device)) {
- ret = PTR_ERR(geodewdt_platform_device);
+ ret = platform_driver_probe(&geodewdt_driver, geodewdt_probe);
+ if (ret)
goto err;
- }
return 0;
err:
- platform_driver_unregister(&geodewdt_driver);
+ platform_device_unregister(geodewdt_platform_device);
return ret;
}
-static void __exit
-geodewdt_exit(void)
+static void __exit geodewdt_exit(void)
{
platform_device_unregister(geodewdt_platform_device);
platform_driver_unregister(&geodewdt_driver);
@@ -305,4 +294,3 @@ module_exit(geodewdt_exit);
MODULE_AUTHOR("Advanced Micro Devices, Inc");
MODULE_DESCRIPTION("Geode GX/LX Watchdog Driver");
MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-10 00:34:43 +0000