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-rw-r--r--drivers/char/watchdog/rm9k_wdt.c216
1 files changed, 101 insertions, 115 deletions
diff --git a/drivers/char/watchdog/rm9k_wdt.c b/drivers/char/watchdog/rm9k_wdt.c
index da3fc63bca6..1aad9138f71 100644
--- a/drivers/char/watchdog/rm9k_wdt.c
+++ b/drivers/char/watchdog/rm9k_wdt.c
@@ -46,8 +46,7 @@
/* Function prototypes */
-static int __init wdt_gpi_probe(struct device *);
-static int __exit wdt_gpi_remove(struct device *);
+static irqreturn_t wdt_gpi_irqhdl(int, void *, struct pt_regs *);
static void wdt_gpi_set_timeout(unsigned int);
static int wdt_gpi_open(struct inode *, struct file *);
static int wdt_gpi_release(struct inode *, struct file *);
@@ -55,7 +54,8 @@ static ssize_t wdt_gpi_write(struct file *, const char __user *, size_t, loff_t
static long wdt_gpi_ioctl(struct file *, unsigned int, unsigned long);
static const struct resource *wdt_gpi_get_resource(struct platform_device *, const char *, unsigned int);
static int wdt_gpi_notify(struct notifier_block *, unsigned long, void *);
-static irqreturn_t wdt_gpi_irqhdl(int, void *, struct pt_regs *);
+static int __init wdt_gpi_probe(struct device *);
+static int __exit wdt_gpi_remove(struct device *);
static const char wdt_gpi_name[] = "wdt_gpi";
@@ -91,93 +91,26 @@ module_param(nowayout, bool, 0444);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be disabled once started");
-
-static struct file_operations fops = {
- .owner = THIS_MODULE,
- .open = wdt_gpi_open,
- .release = wdt_gpi_release,
- .write = wdt_gpi_write,
- .unlocked_ioctl = wdt_gpi_ioctl,
-};
-
-static struct miscdevice miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = wdt_gpi_name,
- .fops = &fops,
-};
-
-static struct device_driver wdt_gpi_driver = {
- .name = (char *) wdt_gpi_name,
- .bus = &platform_bus_type,
- .owner = THIS_MODULE,
- .probe = wdt_gpi_probe,
- .remove = __exit_p(wdt_gpi_remove),
- .shutdown = NULL,
- .suspend = NULL,
- .resume = NULL,
-};
-
-static struct notifier_block wdt_gpi_shutdown = {
- .notifier_call = wdt_gpi_notify,
-};
-
-
-
-static const struct resource *
-wdt_gpi_get_resource(struct platform_device *pdv, const char *name,
- unsigned int type)
-{
- char buf[80];
- if (snprintf(buf, sizeof buf, "%s_0", name) >= sizeof buf)
- return NULL;
- return platform_get_resource_byname(pdv, type, buf);
-}
-
-
-
-/* No hotplugging on the platform bus - use __init */
-static int __init wdt_gpi_probe(struct device *dev)
+/* Interrupt handler */
+static irqreturn_t wdt_gpi_irqhdl(int irq, void *ctxt, struct pt_regs *regs)
{
- int res;
- struct platform_device * const pdv = to_platform_device(dev);
- const struct resource
- * const rr = wdt_gpi_get_resource(pdv, WDT_RESOURCE_REGS,
- IORESOURCE_MEM),
- * const ri = wdt_gpi_get_resource(pdv, WDT_RESOURCE_IRQ,
- IORESOURCE_IRQ),
- * const rc = wdt_gpi_get_resource(pdv, WDT_RESOURCE_COUNTER,
- 0);
-
- if (unlikely(!rr || !ri || !rc))
- return -ENXIO;
-
- wd_regs = ioremap_nocache(rr->start, rr->end + 1 - rr->start);
- if (unlikely(!wd_regs))
- return -ENOMEM;
- wd_irq = ri->start;
- wd_ctr = rc->start;
- res = misc_register(&miscdev);
- if (res)
- iounmap(wd_regs);
- else
- register_reboot_notifier(&wdt_gpi_shutdown);
- return res;
-}
-
+ if (!unlikely(__raw_readl(wd_regs + 0x0008) & 0x1))
+ return IRQ_NONE;
+ __raw_writel(0x1, wd_regs + 0x0008);
-static int __exit wdt_gpi_remove(struct device *dev)
-{
- int res;
+ printk(KERN_WARNING "%s: watchdog expired - resetting system\n",
+ wdt_gpi_name);
- unregister_reboot_notifier(&wdt_gpi_shutdown);
- res = misc_deregister(&miscdev);
- iounmap(wd_regs);
- wd_regs = NULL;
- return res;
+ *(volatile char *) flagaddr |= 0x01;
+ *(volatile char *) resetaddr = powercycle ? 0x01 : 0x2;
+ iob();
+ while (1)
+ cpu_relax();
}
+/* Watchdog functions */
static void wdt_gpi_set_timeout(unsigned int to)
{
u32 reg;
@@ -197,7 +130,7 @@ static void wdt_gpi_set_timeout(unsigned int to)
}
-
+/* /dev/watchdog operations */
static int wdt_gpi_open(struct inode *i, struct file *f)
{
int res;
@@ -231,8 +164,6 @@ static int wdt_gpi_open(struct inode *i, struct file *f)
return 0;
}
-
-
static int wdt_gpi_release(struct inode *i, struct file *f)
{
if (nowayout) {
@@ -267,8 +198,6 @@ static int wdt_gpi_release(struct inode *i, struct file *f)
return 0;
}
-
-
static ssize_t
wdt_gpi_write(struct file *f, const char __user *d, size_t s, loff_t *o)
{
@@ -279,8 +208,6 @@ wdt_gpi_write(struct file *f, const char __user *d, size_t s, loff_t *o)
return s ? 1 : 0;
}
-
-
static long
wdt_gpi_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
{
@@ -362,27 +289,7 @@ wdt_gpi_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
}
-
-
-static irqreturn_t wdt_gpi_irqhdl(int irq, void *ctxt, struct pt_regs *regs)
-{
- if (!unlikely(__raw_readl(wd_regs + 0x0008) & 0x1))
- return IRQ_NONE;
- __raw_writel(0x1, wd_regs + 0x0008);
-
-
- printk(KERN_WARNING "%s: watchdog expired - resetting system\n",
- wdt_gpi_name);
-
- *(volatile char *) flagaddr |= 0x01;
- *(volatile char *) resetaddr = powercycle ? 0x01 : 0x2;
- iob();
- while (1)
- cpu_relax();
-}
-
-
-
+/* Shutdown notifier*/
static int
wdt_gpi_notify(struct notifier_block *this, unsigned long code, void *unused)
{
@@ -401,6 +308,89 @@ wdt_gpi_notify(struct notifier_block *this, unsigned long code, void *unused)
}
+/* Kernel interfaces */
+static struct file_operations fops = {
+ .owner = THIS_MODULE,
+ .open = wdt_gpi_open,
+ .release = wdt_gpi_release,
+ .write = wdt_gpi_write,
+ .unlocked_ioctl = wdt_gpi_ioctl,
+};
+
+static struct miscdevice miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = wdt_gpi_name,
+ .fops = &fops,
+};
+
+static struct notifier_block wdt_gpi_shutdown = {
+ .notifier_call = wdt_gpi_notify,
+};
+
+
+/* Init & exit procedures */
+static const struct resource *
+wdt_gpi_get_resource(struct platform_device *pdv, const char *name,
+ unsigned int type)
+{
+ char buf[80];
+ if (snprintf(buf, sizeof buf, "%s_0", name) >= sizeof buf)
+ return NULL;
+ return platform_get_resource_byname(pdv, type, buf);
+}
+
+/* No hotplugging on the platform bus - use __init */
+static int __init wdt_gpi_probe(struct device *dev)
+{
+ int res;
+ struct platform_device * const pdv = to_platform_device(dev);
+ const struct resource
+ * const rr = wdt_gpi_get_resource(pdv, WDT_RESOURCE_REGS,
+ IORESOURCE_MEM),
+ * const ri = wdt_gpi_get_resource(pdv, WDT_RESOURCE_IRQ,
+ IORESOURCE_IRQ),
+ * const rc = wdt_gpi_get_resource(pdv, WDT_RESOURCE_COUNTER,
+ 0);
+
+ if (unlikely(!rr || !ri || !rc))
+ return -ENXIO;
+
+ wd_regs = ioremap_nocache(rr->start, rr->end + 1 - rr->start);
+ if (unlikely(!wd_regs))
+ return -ENOMEM;
+ wd_irq = ri->start;
+ wd_ctr = rc->start;
+ res = misc_register(&miscdev);
+ if (res)
+ iounmap(wd_regs);
+ else
+ register_reboot_notifier(&wdt_gpi_shutdown);
+ return res;
+}
+
+static int __exit wdt_gpi_remove(struct device *dev)
+{
+ int res;
+
+ unregister_reboot_notifier(&wdt_gpi_shutdown);
+ res = misc_deregister(&miscdev);
+ iounmap(wd_regs);
+ wd_regs = NULL;
+ return res;
+}
+
+
+/* Device driver init & exit */
+static struct device_driver wdt_gpi_driver = {
+ .name = (char *) wdt_gpi_name,
+ .bus = &platform_bus_type,
+ .owner = THIS_MODULE,
+ .probe = wdt_gpi_probe,
+ .remove = __exit_p(wdt_gpi_remove),
+ .shutdown = NULL,
+ .suspend = NULL,
+ .resume = NULL,
+};
static int __init wdt_gpi_init_module(void)
{
@@ -410,8 +400,6 @@ static int __init wdt_gpi_init_module(void)
return driver_register(&wdt_gpi_driver);
}
-
-
static void __exit wdt_gpi_cleanup_module(void)
{
driver_unregister(&wdt_gpi_driver);
@@ -420,8 +408,6 @@ static void __exit wdt_gpi_cleanup_module(void)
module_init(wdt_gpi_init_module);
module_exit(wdt_gpi_cleanup_module);
-
-
MODULE_AUTHOR("Thomas Koeller <thomas.koeller@baslerweb.com>");
MODULE_DESCRIPTION("Basler eXcite watchdog driver for gpi devices");
MODULE_VERSION("0.1");
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-30 13:58:25 +0000