#include <linux/errno.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
#include <linux/watchdog.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
#include <linux/fs.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <asm/addrspace.h>
-#include <asm/ar7/ar7.h>
+#include <asm/mach-ar7/ar7.h>
#define DRVNAME "ar7_wdt"
#define LONGNAME "TI AR7 Watchdog Timer"
u32 prescale;
};
-static struct semaphore open_semaphore;
+static unsigned long wdt_is_open;
+static spinlock_t wdt_lock;
static unsigned expect_close;
/* XXX currently fixed, allows max margin ~68.72 secs */
#define prescale_value 0xffff
-/* Offset of the WDT registers */
-static unsigned long ar7_regs_wdt;
+/* Resource of the WDT registers */
+static struct resource *ar7_regs_wdt;
/* Pointer to the remapped WDT IO space */
static struct ar7_wdt *ar7_wdt;
-static void ar7_wdt_get_regs(void)
-{
- u16 chip_id = ar7_chip_id();
- switch (chip_id) {
- case AR7_CHIP_7100:
- case AR7_CHIP_7200:
- ar7_regs_wdt = AR7_REGS_WDT;
- break;
- default:
- ar7_regs_wdt = UR8_REGS_WDT;
- break;
- }
-}
-
static void ar7_wdt_kick(u32 value)
{
u32 change;
change = new_margin * (ar7_vbus_freq() / prescale_value);
- if (change < 1) change = 1;
- if (change > 0xffff) change = 0xffff;
+ if (change < 1)
+ change = 1;
+ if (change > 0xffff)
+ change = 0xffff;
ar7_wdt_change(change);
margin = change * prescale_value / ar7_vbus_freq();
printk(KERN_INFO DRVNAME
static int ar7_wdt_open(struct inode *inode, struct file *file)
{
/* only allow one at a time */
- if (down_trylock(&open_semaphore))
+ if (test_and_set_bit(0, &wdt_is_open))
return -EBUSY;
ar7_wdt_enable_wdt();
expect_close = 0;
"will not disable the watchdog timer\n");
else if (!nowayout)
ar7_wdt_disable_wdt();
-
- up(&open_semaphore);
-
+ clear_bit(0, &wdt_is_open);
return 0;
}
-static int ar7_wdt_notify_sys(struct notifier_block *this,
- unsigned long code, void *unused)
-{
- if (code == SYS_HALT || code == SYS_POWER_OFF)
- if (!nowayout)
- ar7_wdt_disable_wdt();
-
- return NOTIFY_DONE;
-}
-
-static struct notifier_block ar7_wdt_notifier = {
- .notifier_call = ar7_wdt_notify_sys
-};
-
static ssize_t ar7_wdt_write(struct file *file, const char *data,
size_t len, loff_t *ppos)
{
if (len) {
size_t i;
+ spin_lock(&wdt_lock);
ar7_wdt_kick(1);
+ spin_unlock(&wdt_lock);
expect_close = 0;
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')
expect_close = 1;
return len;
}
-static int ar7_wdt_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long ar7_wdt_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
{
static struct watchdog_info ident = {
.identity = LONGNAME,
.firmware_version = 1,
- .options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING),
+ .options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE),
};
int new_margin;
switch (cmd) {
- default:
- return -ENOTTY;
case WDIOC_GETSUPPORT:
if (copy_to_user((struct watchdog_info *)arg, &ident,
sizeof(ident)))
if (new_margin < 1)
return -EINVAL;
+ spin_lock(&wdt_lock);
ar7_wdt_update_margin(new_margin);
ar7_wdt_kick(1);
+ spin_unlock(&wdt_lock);
case WDIOC_GETTIMEOUT:
if (put_user(margin, (int *)arg))
return -EFAULT;
return 0;
+ default:
+ return -ENOTTY;
}
}
-static struct file_operations ar7_wdt_fops = {
+static const struct file_operations ar7_wdt_fops = {
.owner = THIS_MODULE,
.write = ar7_wdt_write,
- .ioctl = ar7_wdt_ioctl,
+ .unlocked_ioctl = ar7_wdt_ioctl,
.open = ar7_wdt_open,
.release = ar7_wdt_release,
};
.fops = &ar7_wdt_fops,
};
-static int __init ar7_wdt_init(void)
+static int __devinit ar7_wdt_probe(struct platform_device *pdev)
{
int rc;
- ar7_wdt_get_regs();
+ spin_lock_init(&wdt_lock);
- if (!request_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt),
- LONGNAME)) {
+ ar7_regs_wdt =
+ platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
+ if (!ar7_regs_wdt) {
+ printk(KERN_ERR DRVNAME ": could not get registers resource\n");
+ rc = -ENODEV;
+ goto out;
+ }
+
+ if (!request_mem_region(ar7_regs_wdt->start,
+ resource_size(ar7_regs_wdt), LONGNAME)) {
printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
- return -EBUSY;
+ rc = -EBUSY;
+ goto out;
}
- ar7_wdt = (struct ar7_wdt *)
- ioremap(ar7_regs_wdt, sizeof(struct ar7_wdt));
+ ar7_wdt = ioremap(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
+ if (!ar7_wdt) {
+ printk(KERN_ERR DRVNAME ": could not ioremap registers\n");
+ rc = -ENXIO;
+ goto out_mem_region;
+ }
ar7_wdt_disable_wdt();
ar7_wdt_prescale(prescale_value);
ar7_wdt_update_margin(margin);
- sema_init(&open_semaphore, 1);
-
- rc = register_reboot_notifier(&ar7_wdt_notifier);
- if (rc) {
- printk(KERN_ERR DRVNAME
- ": unable to register reboot notifier\n");
- goto out_alloc;
- }
-
rc = misc_register(&ar7_wdt_miscdev);
if (rc) {
printk(KERN_ERR DRVNAME ": unable to register misc device\n");
- goto out_register;
+ goto out_alloc;
}
goto out;
-out_register:
- unregister_reboot_notifier(&ar7_wdt_notifier);
out_alloc:
iounmap(ar7_wdt);
- release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt));
+out_mem_region:
+ release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
out:
return rc;
}
-static void __exit ar7_wdt_cleanup(void)
+static int __devexit ar7_wdt_remove(struct platform_device *pdev)
{
misc_deregister(&ar7_wdt_miscdev);
- unregister_reboot_notifier(&ar7_wdt_notifier);
iounmap(ar7_wdt);
- release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt));
+ release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
+
+ return 0;
+}
+
+static void ar7_wdt_shutdown(struct platform_device *pdev)
+{
+ if (!nowayout)
+ ar7_wdt_disable_wdt();
+}
+
+static struct platform_driver ar7_wdt_driver = {
+ .probe = ar7_wdt_probe,
+ .remove = __devexit_p(ar7_wdt_remove),
+ .shutdown = ar7_wdt_shutdown,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "ar7_wdt",
+ },
+};
+
+static int __init ar7_wdt_init(void)
+{
+ return platform_driver_register(&ar7_wdt_driver);
+}
+
+static void __exit ar7_wdt_cleanup(void)
+{
+ platform_driver_unregister(&ar7_wdt_driver);
}
module_init(ar7_wdt_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff