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Diffstat (limited to 'drivers/watchdog/wdt_pci.c')
-rw-r--r--drivers/watchdog/wdt_pci.c301
1 files changed, 172 insertions, 129 deletions
diff --git a/drivers/watchdog/wdt_pci.c b/drivers/watchdog/wdt_pci.c
index 1355608683e..5d922fd6eaf 100644
--- a/drivers/watchdog/wdt_pci.c
+++ b/drivers/watchdog/wdt_pci.c
@@ -29,9 +29,11 @@
* JP Nollmann : Added support for PCI wdt501p
* Alan Cox : Split ISA and PCI cards into two drivers
* Jeff Garzik : PCI cleanups
- * Tigran Aivazian : Restructured wdtpci_init_one() to handle failures
+ * Tigran Aivazian : Restructured wdtpci_init_one() to handle
+ * failures
* Joel Becker : Added WDIOC_GET/SETTIMEOUT
- * Zwane Mwaikambo : Magic char closing, locking changes, cleanups
+ * Zwane Mwaikambo : Magic char closing, locking changes,
+ * cleanups
* Matt Domsch : nowayout module option
*/
@@ -42,14 +44,15 @@
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/ioport.h>
+#include <linux/delay.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/pci.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
#include <asm/system.h>
#define WDT_IS_PCI
@@ -73,7 +76,7 @@
/* We can only use 1 card due to the /dev/watchdog restriction */
static int dev_count;
-static struct semaphore open_sem;
+static unsigned long open_lock;
static DEFINE_SPINLOCK(wdtpci_lock);
static char expect_close;
@@ -86,18 +89,23 @@ static int irq;
static int heartbeat = WD_TIMO;
static int wd_heartbeat;
module_param(heartbeat, int, 0);
-MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")");
+MODULE_PARM_DESC(heartbeat,
+ "Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
+ __MODULE_STRING(WD_TIMO) ")");
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) ")");
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
#ifdef CONFIG_WDT_501_PCI
/* Support for the Fan Tachometer on the PCI-WDT501 */
static int tachometer;
module_param(tachometer, int, 0);
-MODULE_PARM_DESC(tachometer, "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
+MODULE_PARM_DESC(tachometer,
+ "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
#endif /* CONFIG_WDT_501_PCI */
/*
@@ -106,16 +114,19 @@ MODULE_PARM_DESC(tachometer, "PCI-WDT501 Fan Tachometer support (0=disable, defa
static void wdtpci_ctr_mode(int ctr, int mode)
{
- ctr<<=6;
- ctr|=0x30;
- ctr|=(mode<<1);
- outb_p(ctr, WDT_CR);
+ ctr <<= 6;
+ ctr |= 0x30;
+ ctr |= (mode << 1);
+ outb(ctr, WDT_CR);
+ udelay(8);
}
static void wdtpci_ctr_load(int ctr, int val)
{
- outb_p(val&0xFF, WDT_COUNT0+ctr);
- outb_p(val>>8, WDT_COUNT0+ctr);
+ outb(val & 0xFF, WDT_COUNT0 + ctr);
+ udelay(8);
+ outb(val >> 8, WDT_COUNT0 + ctr);
+ udelay(8);
}
/**
@@ -134,23 +145,35 @@ static int wdtpci_start(void)
* "pet" the watchdog, as Access says.
* This resets the clock outputs.
*/
- inb_p(WDT_DC); /* Disable watchdog */
- wdtpci_ctr_mode(2,0); /* Program CTR2 for Mode 0: Pulse on Terminal Count */
- outb_p(0, WDT_DC); /* Enable watchdog */
-
- inb_p(WDT_DC); /* Disable watchdog */
- outb_p(0, WDT_CLOCK); /* 2.0833MHz clock */
- inb_p(WDT_BUZZER); /* disable */
- inb_p(WDT_OPTONOTRST); /* disable */
- inb_p(WDT_OPTORST); /* disable */
- inb_p(WDT_PROGOUT); /* disable */
- wdtpci_ctr_mode(0,3); /* Program CTR0 for Mode 3: Square Wave Generator */
- wdtpci_ctr_mode(1,2); /* Program CTR1 for Mode 2: Rate Generator */
- wdtpci_ctr_mode(2,1); /* Program CTR2 for Mode 1: Retriggerable One-Shot */
- wdtpci_ctr_load(0,20833); /* count at 100Hz */
- wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */
+ inb(WDT_DC); /* Disable watchdog */
+ udelay(8);
+ wdtpci_ctr_mode(2, 0); /* Program CTR2 for Mode 0:
+ Pulse on Terminal Count */
+ outb(0, WDT_DC); /* Enable watchdog */
+ udelay(8);
+ inb(WDT_DC); /* Disable watchdog */
+ udelay(8);
+ outb(0, WDT_CLOCK); /* 2.0833MHz clock */
+ udelay(8);
+ inb(WDT_BUZZER); /* disable */
+ udelay(8);
+ inb(WDT_OPTONOTRST); /* disable */
+ udelay(8);
+ inb(WDT_OPTORST); /* disable */
+ udelay(8);
+ inb(WDT_PROGOUT); /* disable */
+ udelay(8);
+ wdtpci_ctr_mode(0, 3); /* Program CTR0 for Mode 3:
+ Square Wave Generator */
+ wdtpci_ctr_mode(1, 2); /* Program CTR1 for Mode 2:
+ Rate Generator */
+ wdtpci_ctr_mode(2, 1); /* Program CTR2 for Mode 1:
+ Retriggerable One-Shot */
+ wdtpci_ctr_load(0, 20833); /* count at 100Hz */
+ wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
/* DO NOT LOAD CTR2 on PCI card! -- JPN */
- outb_p(0, WDT_DC); /* Enable watchdog */
+ outb(0, WDT_DC); /* Enable watchdog */
+ udelay(8);
spin_unlock_irqrestore(&wdtpci_lock, flags);
return 0;
@@ -162,14 +185,15 @@ static int wdtpci_start(void)
* Stop the watchdog driver.
*/
-static int wdtpci_stop (void)
+static int wdtpci_stop(void)
{
unsigned long flags;
/* Turn the card off */
spin_lock_irqsave(&wdtpci_lock, flags);
- inb_p(WDT_DC); /* Disable watchdog */
- wdtpci_ctr_load(2,0); /* 0 length reset pulses now */
+ inb(WDT_DC); /* Disable watchdog */
+ udelay(8);
+ wdtpci_ctr_load(2, 0); /* 0 length reset pulses now */
spin_unlock_irqrestore(&wdtpci_lock, flags);
return 0;
}
@@ -177,20 +201,23 @@ static int wdtpci_stop (void)
/**
* wdtpci_ping:
*
- * Reload counter one with the watchdog heartbeat. We don't bother reloading
- * the cascade counter.
+ * Reload counter one with the watchdog heartbeat. We don't bother
+ * reloading the cascade counter.
*/
static int wdtpci_ping(void)
{
unsigned long flags;
- /* Write a watchdog value */
spin_lock_irqsave(&wdtpci_lock, flags);
- inb_p(WDT_DC); /* Disable watchdog */
- wdtpci_ctr_mode(1,2); /* Re-Program CTR1 for Mode 2: Rate Generator */
- wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */
- outb_p(0, WDT_DC); /* Enable watchdog */
+ /* Write a watchdog value */
+ inb(WDT_DC); /* Disable watchdog */
+ udelay(8);
+ wdtpci_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2:
+ Rate Generator */
+ wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
+ outb(0, WDT_DC); /* Enable watchdog */
+ udelay(8);
spin_unlock_irqrestore(&wdtpci_lock, flags);
return 0;
}
@@ -199,14 +226,14 @@ static int wdtpci_ping(void)
* wdtpci_set_heartbeat:
* @t: the new heartbeat value that needs to be set.
*
- * Set a new heartbeat value for the watchdog device. If the heartbeat value is
- * incorrect we keep the old value and return -EINVAL. If successfull we
- * return 0.
+ * Set a new heartbeat value for the watchdog device. If the heartbeat
+ * value is incorrect we keep the old value and return -EINVAL.
+ * If successful we return 0.
*/
static int wdtpci_set_heartbeat(int t)
{
/* Arbitrary, can't find the card's limits */
- if ((t < 1) || (t > 65535))
+ if (t < 1 || t > 65535)
return -EINVAL;
heartbeat = t;
@@ -227,9 +254,14 @@ static int wdtpci_set_heartbeat(int t)
static int wdtpci_get_status(int *status)
{
- unsigned char new_status=inb_p(WDT_SR);
+ unsigned char new_status;
+ unsigned long flags;
+
+ spin_lock_irqsave(&wdtpci_lock, flags);
+ new_status = inb(WDT_SR);
+ spin_unlock_irqrestore(&wdtpci_lock, flags);
- *status=0;
+ *status = 0;
if (new_status & WDC_SR_ISOI0)
*status |= WDIOF_EXTERN1;
if (new_status & WDC_SR_ISII1)
@@ -259,8 +291,12 @@ static int wdtpci_get_status(int *status)
static int wdtpci_get_temperature(int *temperature)
{
- unsigned short c=inb_p(WDT_RT);
-
+ unsigned short c;
+ unsigned long flags;
+ spin_lock_irqsave(&wdtpci_lock, flags);
+ c = inb(WDT_RT);
+ udelay(8);
+ spin_unlock_irqrestore(&wdtpci_lock, flags);
*temperature = (c * 11 / 15) + 7;
return 0;
}
@@ -282,17 +318,25 @@ static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
* Read the status register see what is up and
* then printk it.
*/
- unsigned char status=inb_p(WDT_SR);
+ unsigned char status;
+
+ spin_lock(&wdtpci_lock);
+
+ status = inb(WDT_SR);
+ udelay(8);
printk(KERN_CRIT PFX "status %d\n", status);
#ifdef CONFIG_WDT_501_PCI
- if (!(status & WDC_SR_TGOOD))
- printk(KERN_CRIT PFX "Overheat alarm.(%d)\n",inb_p(WDT_RT));
+ if (!(status & WDC_SR_TGOOD)) {
+ u8 alarm = inb(WDT_RT);
+ printk(KERN_CRIT PFX "Overheat alarm.(%d)\n", alarm);
+ udelay(8);
+ }
if (!(status & WDC_SR_PSUOVER))
- printk(KERN_CRIT PFX "PSU over voltage.\n");
+ printk(KERN_CRIT PFX "PSU over voltage.\n");
if (!(status & WDC_SR_PSUUNDR))
- printk(KERN_CRIT PFX "PSU under voltage.\n");
+ printk(KERN_CRIT PFX "PSU under voltage.\n");
if (tachometer) {
if (!(status & WDC_SR_FANGOOD))
printk(KERN_CRIT PFX "Possible fan fault.\n");
@@ -310,6 +354,7 @@ static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
printk(KERN_CRIT PFX "Reset in 5ms.\n");
#endif
}
+ spin_unlock(&wdtpci_lock);
return IRQ_HANDLED;
}
@@ -325,7 +370,8 @@ static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
* write of data will do, as we we don't define content meaning.
*/
-static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+static ssize_t wdtpci_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
{
if (count) {
if (!nowayout) {
@@ -335,7 +381,7 @@ static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t co
for (i = 0; i != count; i++) {
char c;
- if(get_user(c, buf+i))
+ if (get_user(c, buf+i))
return -EFAULT;
if (c == 'V')
expect_close = 42;
@@ -343,13 +389,11 @@ static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t co
}
wdtpci_ping();
}
-
return count;
}
/**
* wdtpci_ioctl:
- * @inode: inode of the device
* @file: file handle to the device
* @cmd: watchdog command
* @arg: argument pointer
@@ -359,8 +403,8 @@ static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t co
* querying capabilities and current status.
*/
-static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
+static long wdtpci_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
{
int new_heartbeat;
int status;
@@ -383,33 +427,29 @@ static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd
ident.options |= WDIOF_FANFAULT;
#endif /* CONFIG_WDT_501_PCI */
- switch(cmd)
- {
- default:
- return -ENOTTY;
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
-
- case WDIOC_GETSTATUS:
- wdtpci_get_status(&status);
- return put_user(status, p);
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
- case WDIOC_KEEPALIVE:
- wdtpci_ping();
- return 0;
- case WDIOC_SETTIMEOUT:
- if (get_user(new_heartbeat, p))
- return -EFAULT;
-
- if (wdtpci_set_heartbeat(new_heartbeat))
- return -EINVAL;
-
- wdtpci_ping();
- /* Fall */
- case WDIOC_GETTIMEOUT:
- return put_user(heartbeat, p);
- }
+ switch (cmd) {
+ default:
+ return -ENOTTY;
+ case WDIOC_GETSUPPORT:
+ return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
+ case WDIOC_GETSTATUS:
+ wdtpci_get_status(&status);
+ return put_user(status, p);
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(0, p);
+ case WDIOC_KEEPALIVE:
+ wdtpci_ping();
+ return 0;
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_heartbeat, p))
+ return -EFAULT;
+ if (wdtpci_set_heartbeat(new_heartbeat))
+ return -EINVAL;
+ wdtpci_ping();
+ /* Fall */
+ case WDIOC_GETTIMEOUT:
+ return put_user(heartbeat, p);
+ }
}
/**
@@ -426,12 +466,11 @@ static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd
static int wdtpci_open(struct inode *inode, struct file *file)
{
- if (down_trylock(&open_sem))
+ if (test_and_set_bit(0, &open_lock))
return -EBUSY;
- if (nowayout) {
+ if (nowayout)
__module_get(THIS_MODULE);
- }
/*
* Activate
*/
@@ -460,7 +499,7 @@ static int wdtpci_release(struct inode *inode, struct file *file)
wdtpci_ping();
}
expect_close = 0;
- up(&open_sem);
+ clear_bit(0, &open_lock);
return 0;
}
@@ -476,14 +515,15 @@ static int wdtpci_release(struct inode *inode, struct file *file)
* fahrenheit. It was designed by an imperial measurement luddite.
*/
-static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr)
+static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ptr)
{
int temperature;
if (wdtpci_get_temperature(&temperature))
return -EFAULT;
- if (copy_to_user (buf, &temperature, 1))
+ if (copy_to_user(buf, &temperature, 1))
return -EFAULT;
return 1;
@@ -529,12 +569,10 @@ static int wdtpci_temp_release(struct inode *inode, struct file *file)
*/
static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
- void *unused)
+ void *unused)
{
- if (code==SYS_DOWN || code==SYS_HALT) {
- /* Turn the card off */
+ if (code == SYS_DOWN || code == SYS_HALT)
wdtpci_stop();
- }
return NOTIFY_DONE;
}
@@ -547,7 +585,7 @@ static const struct file_operations wdtpci_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = wdtpci_write,
- .ioctl = wdtpci_ioctl,
+ .unlocked_ioctl = wdtpci_ioctl,
.open = wdtpci_open,
.release = wdtpci_release,
};
@@ -584,80 +622,85 @@ static struct notifier_block wdtpci_notifier = {
};
-static int __devinit wdtpci_init_one (struct pci_dev *dev,
- const struct pci_device_id *ent)
+static int __devinit wdtpci_init_one(struct pci_dev *dev,
+ const struct pci_device_id *ent)
{
int ret = -EIO;
dev_count++;
if (dev_count > 1) {
- printk (KERN_ERR PFX "this driver only supports 1 device\n");
+ printk(KERN_ERR PFX "This driver only supports one device\n");
return -ENODEV;
}
- if (pci_enable_device (dev)) {
- printk (KERN_ERR PFX "Not possible to enable PCI Device\n");
+ if (pci_enable_device(dev)) {
+ printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
return -ENODEV;
}
- if (pci_resource_start (dev, 2) == 0x0000) {
- printk (KERN_ERR PFX "No I/O-Address for card detected\n");
+ if (pci_resource_start(dev, 2) == 0x0000) {
+ printk(KERN_ERR PFX "No I/O-Address for card detected\n");
ret = -ENODEV;
goto out_pci;
}
- sema_init(&open_sem, 1);
-
irq = dev->irq;
- io = pci_resource_start (dev, 2);
+ io = pci_resource_start(dev, 2);
- if (request_region (io, 16, "wdt_pci") == NULL) {
- printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
+ if (request_region(io, 16, "wdt_pci") == NULL) {
+ printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
goto out_pci;
}
- if (request_irq (irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED,
+ if (request_irq(irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED,
"wdt_pci", &wdtpci_miscdev)) {
- printk (KERN_ERR PFX "IRQ %d is not free\n", irq);
+ printk(KERN_ERR PFX "IRQ %d is not free\n", irq);
goto out_reg;
}
- printk ("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
- io, irq);
+ printk(KERN_INFO
+ "PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
+ io, irq);
- /* Check that the heartbeat value is within it's range ; if not reset to the default */
+ /* Check that the heartbeat value is within its range;
+ if not reset to the default */
if (wdtpci_set_heartbeat(heartbeat)) {
wdtpci_set_heartbeat(WD_TIMO);
- printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
- WD_TIMO);
+ printk(KERN_INFO PFX
+ "heartbeat value must be 0 < heartbeat < 65536, using %d\n",
+ WD_TIMO);
}
- ret = register_reboot_notifier (&wdtpci_notifier);
+ ret = register_reboot_notifier(&wdtpci_notifier);
if (ret) {
- printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", ret);
+ printk(KERN_ERR PFX
+ "cannot register reboot notifier (err=%d)\n", ret);
goto out_irq;
}
#ifdef CONFIG_WDT_501_PCI
- ret = misc_register (&temp_miscdev);
+ ret = misc_register(&temp_miscdev);
if (ret) {
- printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- TEMP_MINOR, ret);
+ printk(KERN_ERR PFX
+ "cannot register miscdev on minor=%d (err=%d)\n",
+ TEMP_MINOR, ret);
goto out_rbt;
}
#endif /* CONFIG_WDT_501_PCI */
- ret = misc_register (&wdtpci_miscdev);
+ ret = misc_register(&wdtpci_miscdev);
if (ret) {
- printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
+ printk(KERN_ERR PFX
+ "cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, ret);
goto out_misc;
}
printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
heartbeat, nowayout);
#ifdef CONFIG_WDT_501_PCI
- printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled"));
+ printk(KERN_INFO "wdt: Fan Tachometer is %s\n",
+ (tachometer ? "Enabled" : "Disabled"));
#endif /* CONFIG_WDT_501_PCI */
ret = 0;
@@ -673,14 +716,14 @@ out_rbt:
out_irq:
free_irq(irq, &wdtpci_miscdev);
out_reg:
- release_region (io, 16);
+ release_region(io, 16);
out_pci:
pci_disable_device(dev);
goto out;
}
-static void __devexit wdtpci_remove_one (struct pci_dev *pdev)
+static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
{
/* here we assume only one device will ever have
* been picked up and registered by probe function */
@@ -728,7 +771,7 @@ static struct pci_driver wdtpci_driver = {
static void __exit wdtpci_cleanup(void)
{
- pci_unregister_driver (&wdtpci_driver);
+ pci_unregister_driver(&wdtpci_driver);
}
@@ -742,7 +785,7 @@ static void __exit wdtpci_cleanup(void)
static int __init wdtpci_init(void)
{
- return pci_register_driver (&wdtpci_driver);
+ return pci_register_driver(&wdtpci_driver);
}
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