/*
* Allow only one task to hold it open
*/
static int omap_wdt_open(struct inode *inode, struct file *file)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(omap_wdt_dev);
int ret;
ret = omap_wdt_setup(wdev);
if (ret)
return ret;
file->private_data = (void *) wdev;
return nonseekable_open(inode, file);
}
static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct omap_wdt_dev *wdev;
int new_margin;
static const struct watchdog_info ident = {
.identity = "OMAP Watchdog",
.options = WDIOF_SETTIMEOUT,
.firmware_version = 0,
};
wdev = file->private_data;
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user((struct watchdog_info __user *)arg, &ident,
sizeof(ident));
case WDIOC_GETSTATUS:
return put_user(0, (int __user *)arg);
case WDIOC_GETBOOTSTATUS:
if (cpu_is_omap16xx())
return put_user(__raw_readw(ARM_SYSST),
(int __user *)arg);
if (cpu_is_omap24xx())
return put_user(omap_prcm_get_reset_sources(),
(int __user *)arg);
case WDIOC_KEEPALIVE:
spin_lock(&wdt_lock);
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int __user *)arg))
return -EFAULT;
omap_wdt_adjust_timeout(new_margin);
spin_lock(&wdt_lock);
omap_wdt_disable(wdev);
omap_wdt_set_timeout(wdev);
omap_wdt_enable(wdev);
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(timer_margin, (int __user *)arg);
default:
return -ENOTTY;
}
}
static const struct file_operations omap_wdt_fops = {
.owner = THIS_MODULE,
.write = omap_wdt_write,
.unlocked_ioctl = omap_wdt_ioctl,
.open = omap_wdt_open,
.release = omap_wdt_release,
.llseek = no_llseek,
};
static int omap_wdt_nb_func(struct notifier_block *nb, unsigned long val,
void *v)
{
struct omap_wdt_dev *wdev = container_of(nb, struct omap_wdt_dev, nb);
omap_wdt_ping(wdev);
return NOTIFY_OK;
}
static int __devinit omap_wdt_probe(struct platform_device *pdev)
{
struct resource *res, *mem, *res_irq;
struct omap_wdt_dev *wdev;
int ret;
/* reserve static register mappings */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
ret = -ENOENT;
goto err_get_resource;
}
if (omap_wdt_dev) {
ret = -EBUSY;
goto err_busy;
}
mem = request_mem_region(res->start, resource_size(res), pdev->name);
if (!mem) {
ret = -EBUSY;
goto err_busy;
}
res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL);
if (!wdev) {
ret = -ENOMEM;
goto err_kzalloc;
}
wdev->omap_wdt_users = 0;
wdev->mem = mem;
wdev->dev = &pdev->dev;
wdev->base = ioremap(res->start, resource_size(res));
if (!wdev->base) {
ret = -ENOMEM;
goto err_ioremap;
}
if (res_irq) {
ret = request_irq(res_irq->start, omap_wdt_interrupt, 0,
dev_name(&pdev->dev), wdev);
if (ret)
goto err_irq;
wdev->irq = res_irq->start;
}
platform_set_drvdata(pdev, wdev);
/*
* Note: PM runtime functions must be used only when watchdog driver
* is enabling/disabling. Dynamic handling of clock of watchdog timer on
* OMAP4/5 (like provided with runtime API) will cause system failure
*/
pm_runtime_enable(wdev->dev);
pm_runtime_irq_safe(wdev->dev);
pm_runtime_get_sync(wdev->dev);
omap_wdt_disable(wdev);
omap_wdt_adjust_timeout(timer_margin);
wdev->omap_wdt_miscdev.parent = &pdev->dev;
wdev->omap_wdt_miscdev.minor = WATCHDOG_MINOR;
wdev->omap_wdt_miscdev.name = "watchdog";
wdev->omap_wdt_miscdev.fops = &omap_wdt_fops;
ret = misc_register(&(wdev->omap_wdt_miscdev));
if (ret)
goto err_misc;
pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
__raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
timer_margin);
omap_wdt_dev = pdev;
if (kernelpet && wdev->irq) {
wdev->nb.notifier_call = omap_wdt_nb_func;
atomic_notifier_chain_register(&touch_watchdog_notifier_head,
&wdev->nb);
return omap_wdt_setup(wdev);
}
pm_runtime_put_sync(wdev->dev);
return 0;
err_misc:
pm_runtime_put_sync(wdev->dev);
platform_set_drvdata(pdev, NULL);
if (wdev->irq)
free_irq(wdev->irq, wdev);
err_irq:
iounmap(wdev->base);
err_ioremap:
wdev->base = NULL;
kfree(wdev);
err_kzalloc:
release_mem_region(res->start, resource_size(res));
err_busy:
err_get_resource:
return ret;
}
static void omap_wdt_shutdown(struct platform_device *pdev)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users) {
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
}
}
static int __devexit omap_wdt_remove(struct platform_device *pdev)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOENT;
misc_deregister(&(wdev->omap_wdt_miscdev));
release_mem_region(res->start, resource_size(res));
platform_set_drvdata(pdev, NULL);
if (wdev->irq)
free_irq(wdev->irq, wdev);
if (kernelpet && wdev->irq)
atomic_notifier_chain_unregister(&touch_watchdog_notifier_head,
&wdev->nb);
iounmap(wdev->base);
kfree(wdev);
omap_wdt_dev = NULL;
return 0;
}
#ifdef CONFIG_PM
/* REVISIT ... not clear this is the best way to handle system suspend; and
* it's very inappropriate for selective device suspend (e.g. suspending this
* through sysfs rather than by stopping the watchdog daemon). Also, this
* may not play well enough with NOWAYOUT...
*/
static int omap_wdt_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users) {
omap_wdt_disable(wdev);
pm_runtime_put_sync_suspend(wdev->dev);
}
return 0;
}
static int omap_wdt_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users) {
pm_runtime_get_sync(wdev->dev);
omap_wdt_enable(wdev);
omap_wdt_ping(wdev);
}
return 0;
}
#else
#define omap_wdt_suspend NULL
#define omap_wdt_resume NULL
#endif
static const struct dev_pm_ops omap_wdt_pm_ops = {
.suspend_noirq = omap_wdt_suspend,
.resume_noirq = omap_wdt_resume,
};
static struct platform_driver omap_wdt_driver = {
.probe = omap_wdt_probe,
.remove = __devexit_p(omap_wdt_remove),
.shutdown = omap_wdt_shutdown,
.driver = {
.owner = THIS_MODULE,
.name = "omap_wdt",
.pm = &omap_wdt_pm_ops,
},
};
static int __init omap_wdt_init(void)
{
spin_lock_init(&wdt_lock);
return platform_driver_register(&omap_wdt_driver);
}
