static int omap_wdt_release(struct inode *inode, struct file *file)
{
/*
* Shut off the timer unless NOWAYOUT is defined.
*/
#ifndef CONFIG_WATCHDOG_NOWAYOUT
omap_wdt_disable();
if (cpu_is_omap16xx()) {
clk_disable(armwdt_ck); /* Disable the clock */
clk_put(armwdt_ck);
armwdt_ck = NULL;
}
if (cpu_is_omap24xx()) {
clk_disable(mpu_wdt_ick); /* Disable the clock */
clk_disable(mpu_wdt_fck); /* Disable the clock */
clk_put(mpu_wdt_ick);
clk_put(mpu_wdt_fck);
mpu_wdt_ick = NULL;
mpu_wdt_fck = NULL;
}
#else
printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
#endif
omap_wdt_users = 0;
return 0;
}
static int omap_wdt_release(struct inode *inode, struct file *file)
{
struct omap_wdt_dev *wdev = file->private_data;
void __iomem *base = wdev->base;
/*
* Shut off the timer unless NOWAYOUT is defined.
*/
#ifndef CONFIG_WATCHDOG_NOWAYOUT
pm_runtime_get_sync(wdev->dev);
omap_wdt_disable(wdev);
/* Disable delay interrupt */
if (kernelpet && wdev->irq)
__raw_writel(0x2, base + OMAP_WATCHDOG_WIRQENCLR);
pm_runtime_put_sync(wdev->dev);
#else
printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
#endif
wdev->omap_wdt_users = 0;
return 0;
}
static int omap_wdt_start(struct watchdog_device *wdog)
{
struct omap_wdt_dev *wdev = to_omap_wdt_dev(wdog);
void __iomem *base = wdev->base;
mutex_lock(&wdev->lock);
wdev->omap_wdt_users = true;
pm_runtime_get_sync(wdev->dev);
/*
* Make sure the watchdog is disabled. This is unfortunately required
* because writing to various registers with the watchdog running has no
* effect.
*/
omap_wdt_disable(wdev);
/* initialize prescaler */
while (readl_relaxed(base + OMAP_WATCHDOG_WPS) & 0x01)
cpu_relax();
writel_relaxed((1 << 5) | (PTV << 2), base + OMAP_WATCHDOG_CNTRL);
while (readl_relaxed(base + OMAP_WATCHDOG_WPS) & 0x01)
cpu_relax();
omap_wdt_set_timer(wdev, wdog->timeout);
omap_wdt_reload(wdev); /* trigger loading of new timeout value */
omap_wdt_enable(wdev);
mutex_unlock(&wdev->lock);
return 0;
}
static void omap_wdt_shutdown(struct platform_device *pdev)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users) {
pm_runtime_get_sync(wdev->dev);
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
}
}
static void omap_wdt_shutdown(struct platform_device *pdev)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
mutex_lock(&wdev->lock);
if (wdev->omap_wdt_users) {
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
}
mutex_unlock(&wdev->lock);
}
static int omap_wdt_stop(struct watchdog_device *wdog)
{
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
mutex_lock(&wdev->lock);
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
wdev->omap_wdt_users = false;
mutex_unlock(&wdev->lock);
return 0;
}
static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
mutex_lock(&wdev->lock);
if (wdev->omap_wdt_users) {
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
}
mutex_unlock(&wdev->lock);
return 0;
}
static void disable_wdt(struct omap_wdt_dev *wdev)
{
void __iomem *base = wdev->base;
is_wdt_enabled = WDT_DISABLE;
pm_runtime_get_sync(wdev->dev);
omap_wdt_disable(wdev);
/* Disable delay interrupt */
if (kernelpet && wdev->irq)
__raw_writel(0x2, base + OMAP_WATCHDOG_WIRQENCLR);
pm_runtime_put_sync(wdev->dev);
}
static int omap_wdt_set_timeout(struct watchdog_device *wdog,
unsigned int timeout)
{
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
mutex_lock(&wdev->lock);
omap_wdt_disable(wdev);
omap_wdt_set_timer(wdev, timeout);
omap_wdt_enable(wdev);
omap_wdt_reload(wdev);
wdog->timeout = timeout;
mutex_unlock(&wdev->lock);
return 0;
}
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);
#ifdef CONFIG_OMAP_WATCHDOG_CONTROL
if (!is_wdt_enabled)
return 0;
#endif
if (wdev->omap_wdt_users) {
pm_runtime_get_sync(wdev->dev);
omap_wdt_disable(wdev);
pm_runtime_put_sync_suspend(wdev->dev);
}
return 0;
}
static int omap_wdt_release(struct inode *inode, struct file *file)
{
struct omap_wdt_dev *wdev = file->private_data;
#ifndef CONFIG_WATCHDOG_NOWAYOUT
omap_wdt_disable(wdev);
clk_disable(wdev->ick);
clk_disable(wdev->fck);
#else
printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
#endif
wdev->omap_wdt_users = 0;
return 0;
}
static int omap_wdt_stop(struct watchdog_device *wdog)
{
struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
void __iomem *base = wdev->base;
mutex_lock(&wdev->lock);
omap_wdt_disable(wdev);
/* Disable delay interrupt */
if (kernelpet) {
__raw_writel(0x0, base + OMAP_WATCHDOG_WIRQWAKEEN);
__raw_writel(0x2, base + OMAP_WATCHDOG_WIRQENCLR);
}
pm_runtime_put_sync(wdev->dev);
wdev->omap_wdt_users = false;
mutex_unlock(&wdev->lock);
return 0;
}
static int omap_wdt_release(struct inode *inode, struct file *file)
{
struct omap_wdt_dev *wdev = file->private_data;
/*
* Shut off the timer unless NOWAYOUT is defined.
*/
#ifndef CONFIG_WATCHDOG_NOWAYOUT
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
#else
printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
#endif
wdev->omap_wdt_users = 0;
return 0;
}
static int
omap_wdt_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int new_margin;
static struct watchdog_info ident = {
.identity = "OMAP Watchdog",
.options = WDIOF_SETTIMEOUT,
.firmware_version = 0,
};
switch (cmd) {
default:
return -ENOTTY;
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(omap_readw(ARM_SYSST),
(int __user *)arg);
if (cpu_is_omap24xx())
return put_user(omap_prcm_get_reset_sources(),
(int __user *)arg);
case WDIOC_KEEPALIVE:
omap_wdt_ping();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int __user *)arg))
return -EFAULT;
omap_wdt_adjust_timeout(new_margin);
omap_wdt_disable();
omap_wdt_set_timeout();
omap_wdt_enable();
omap_wdt_ping();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(timer_margin, (int __user *)arg);
}
}
static const struct file_operations omap_wdt_fops = {
.owner = THIS_MODULE,
.write = omap_wdt_write,
.ioctl = omap_wdt_ioctl,
.open = omap_wdt_open,
.release = omap_wdt_release,
};
static struct miscdevice omap_wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &omap_wdt_fops
};
static int __init omap_wdt_probe(struct platform_device *pdev)
{
struct resource *res, *mem;
int ret;
/* reserve static register mappings */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOENT;
mem = request_mem_region(res->start, res->end - res->start + 1,
pdev->name);
if (mem == NULL)
return -EBUSY;
platform_set_drvdata(pdev, mem);
omap_wdt_users = 0;
if (cpu_is_omap16xx()) {
armwdt_ck = clk_get(&pdev->dev, "armwdt_ck");
if (IS_ERR(armwdt_ck)) {
ret = PTR_ERR(armwdt_ck);
armwdt_ck = NULL;
goto fail;
}
}
if (cpu_is_omap24xx()) {
mpu_wdt_ick = clk_get(&pdev->dev, "mpu_wdt_ick");
if (IS_ERR(mpu_wdt_ick)) {
ret = PTR_ERR(mpu_wdt_ick);
mpu_wdt_ick = NULL;
goto fail;
}
mpu_wdt_fck = clk_get(&pdev->dev, "mpu_wdt_fck");
if (IS_ERR(mpu_wdt_fck)) {
ret = PTR_ERR(mpu_wdt_fck);
mpu_wdt_fck = NULL;
goto fail;
}
}
omap_wdt_disable();
omap_wdt_adjust_timeout(timer_margin);
omap_wdt_miscdev.parent = &pdev->dev;
ret = misc_register(&omap_wdt_miscdev);
if (ret)
goto fail;
pr_info("OMAP Watchdog Timer: initial timeout %d sec\n", timer_margin);
/* autogate OCP interface clock */
omap_writel(0x01, OMAP_WATCHDOG_SYS_CONFIG);
return 0;
fail:
if (armwdt_ck)
clk_put(armwdt_ck);
if (mpu_wdt_ick)
clk_put(mpu_wdt_ick);
if (mpu_wdt_fck)
clk_put(mpu_wdt_fck);
release_resource(mem);
return ret;
}
static void omap_wdt_shutdown(struct platform_device *pdev)
{
omap_wdt_disable();
}
static int omap_wdt_remove(struct platform_device *pdev)
{
struct resource *mem = platform_get_drvdata(pdev);
misc_deregister(&omap_wdt_miscdev);
release_resource(mem);
if (armwdt_ck)
clk_put(armwdt_ck);
if (mpu_wdt_ick)
clk_put(mpu_wdt_ick);
if (mpu_wdt_fck)
clk_put(mpu_wdt_fck);
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 platform_device *pdev, pm_message_t state)
{
if (omap_wdt_users)
omap_wdt_disable();
return 0;
}
static int omap_wdt_resume(struct platform_device *pdev)
{
if (omap_wdt_users) {
omap_wdt_enable();
omap_wdt_ping();
}
return 0;
}
#else
#define omap_wdt_suspend NULL
#define omap_wdt_resume NULL
#endif
static struct platform_driver omap_wdt_driver = {
.probe = omap_wdt_probe,
.remove = omap_wdt_remove,
.shutdown = omap_wdt_shutdown,
.suspend = omap_wdt_suspend,
.resume = omap_wdt_resume,
.driver = {
.owner = THIS_MODULE,
.name = "omap_wdt",
},
};
static int __init omap_wdt_init(void)
{
return platform_driver_register(&omap_wdt_driver);
}
static void __exit omap_wdt_exit(void)
{
platform_driver_unregister(&omap_wdt_driver);
}
module_init(omap_wdt_init);
module_exit(omap_wdt_exit);
MODULE_AUTHOR("George G. Davis");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
MODULE_ALIAS("platform:omap_wdt");
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:
pm_runtime_get_sync(wdev->dev);
spin_lock(&wdt_lock);
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
pm_runtime_put_sync(wdev->dev);
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int __user *)arg))
return -EFAULT;
omap_wdt_adjust_timeout(new_margin);
pm_runtime_get_sync(wdev->dev);
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);
pm_runtime_put_sync(wdev->dev);
/* 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);
pm_runtime_get_sync(wdev->dev);
omap_wdt_ping(wdev);
pm_runtime_put_sync_suspend(wdev->dev);
return NOTIFY_OK;
}
#ifdef CONFIG_OMAP_WATCHDOG_CONTROL
static const char ctrl_off[] = "off";
static const char ctrl_on[] = "on";
static ssize_t show_enabled(struct device *dev,
struct device_attribute *attr, char *buf)
{
if (!kernelpet)
return sprintf(buf, "The watchdog is disabled permanently.\n");
switch (is_wdt_enabled) {
case WDT_DISABLE:
return sprintf(buf, "off\n");
case WDT_ENABLE:
return sprintf(buf, "on\n");
default:
return sprintf(buf, "unknown\n");
}
}
static void enable_wdt(struct omap_wdt_dev *wdev)
{
void __iomem *base = wdev->base;
is_wdt_enabled = WDT_ENABLE;
pm_runtime_get_sync(wdev->dev);
/* Enable delay interrupt */
if (kernelpet && wdev->irq)
__raw_writel(0x2, base + OMAP_WATCHDOG_WIRQENSET);
omap_wdt_enable(wdev);
pm_runtime_put_sync(wdev->dev);
}
static int omap_wdt_probe(struct platform_device *pdev)
{
struct omap_wd_timer_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct watchdog_device *omap_wdt;
struct resource *res;
struct omap_wdt_dev *wdev;
u32 rs;
int ret;
omap_wdt = devm_kzalloc(&pdev->dev, sizeof(*omap_wdt), GFP_KERNEL);
if (!omap_wdt)
return -ENOMEM;
wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
if (!wdev)
return -ENOMEM;
wdev->omap_wdt_users = false;
wdev->dev = &pdev->dev;
wdev->wdt_trgr_pattern = 0x1234;
mutex_init(&wdev->lock);
/* reserve static register mappings */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
wdev->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(wdev->base))
return PTR_ERR(wdev->base);
omap_wdt->info = &omap_wdt_info;
omap_wdt->ops = &omap_wdt_ops;
omap_wdt->min_timeout = TIMER_MARGIN_MIN;
omap_wdt->max_timeout = TIMER_MARGIN_MAX;
if (timer_margin >= TIMER_MARGIN_MIN &&
timer_margin <= TIMER_MARGIN_MAX)
omap_wdt->timeout = timer_margin;
else
omap_wdt->timeout = TIMER_MARGIN_DEFAULT;
watchdog_set_drvdata(omap_wdt, wdev);
watchdog_set_nowayout(omap_wdt, nowayout);
platform_set_drvdata(pdev, omap_wdt);
pm_runtime_enable(wdev->dev);
pm_runtime_get_sync(wdev->dev);
if (pdata && pdata->read_reset_sources)
rs = pdata->read_reset_sources();
else
rs = 0;
omap_wdt->bootstatus = (rs & (1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT)) ?
WDIOF_CARDRESET : 0;
omap_wdt_disable(wdev);
ret = watchdog_register_device(omap_wdt);
if (ret) {
pm_runtime_disable(wdev->dev);
return ret;
}
pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
readl_relaxed(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
omap_wdt->timeout);
pm_runtime_put_sync(wdev->dev);
return 0;
}
static int __devinit omap_wdt_probe(struct platform_device *pdev)
{
struct resource *res, *mem, *res_irq;
struct omap_wdt_dev *wdev;
int ret;
#ifdef CONFIG_OMAP_WATCHDOG_CONTROL
int i;
#endif
/* 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);
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);
pm_runtime_put_sync(wdev->dev);
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);
omap_wdt_setup(wdev);
} */
#ifdef CONFIG_OMAP_WATCHDOG_CONTROL
for (i = 0; i < ARRAY_SIZE(wdt_attributes); i++) {
ret = device_create_file(&pdev->dev, wdt_attributes[i]);
if (ret != 0) {
printk(KERN_ERR "Failed to create attr %d: %d\n",
i, ret);
}
}
if (!is_wdt_enabled) {
disable_wdt(wdev);
printk(KERN_WARNING "Disable omap watchdog\n");
}
#endif
return 0;
err_misc:
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 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);
}
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:
pm_runtime_get_sync(wdev->dev);
spin_lock(&wdt_lock);
omap_wdt_ping(wdev);
spin_unlock(&wdt_lock);
pm_runtime_put_sync(wdev->dev);
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int __user *)arg))
return -EFAULT;
omap_wdt_adjust_timeout(new_margin);
pm_runtime_get_sync(wdev->dev);
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);
pm_runtime_put_sync(wdev->dev);
/* 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 __devinit omap_wdt_probe(struct platform_device *pdev)
{
struct resource *res, *mem;
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;
}
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;
}
platform_set_drvdata(pdev, wdev);
pm_runtime_enable(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);
pm_runtime_put_sync(wdev->dev);
omap_wdt_dev = pdev;
return 0;
err_misc:
platform_set_drvdata(pdev, NULL);
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) {
pm_runtime_get_sync(wdev->dev);
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);
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 platform_device *pdev, pm_message_t state)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users) {
pm_runtime_get_sync(wdev->dev);
omap_wdt_disable(wdev);
pm_runtime_put_sync(wdev->dev);
}
return 0;
}
static int omap_wdt_resume(struct platform_device *pdev)
{
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);
pm_runtime_put_sync(wdev->dev);
}
return 0;
}
#else
#define omap_wdt_suspend NULL
#define omap_wdt_resume NULL
#endif
static struct platform_driver omap_wdt_driver = {
.probe = omap_wdt_probe,
.remove = __devexit_p(omap_wdt_remove),
.shutdown = omap_wdt_shutdown,
.suspend = omap_wdt_suspend,
.resume = omap_wdt_resume,
.driver = {
.owner = THIS_MODULE,
.name = "omap_wdt",
},
};
static int __init omap_wdt_init(void)
{
spin_lock_init(&wdt_lock);
return platform_driver_register(&omap_wdt_driver);
}
static int omap_wdt_probe(struct platform_device *pdev)
{
struct omap_wd_timer_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct resource *res;
struct omap_wdt_dev *wdev;
int ret;
wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
if (!wdev)
return -ENOMEM;
wdev->omap_wdt_users = false;
wdev->dev = &pdev->dev;
wdev->wdt_trgr_pattern = 0x1234;
mutex_init(&wdev->lock);
/* reserve static register mappings */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
wdev->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(wdev->base))
return PTR_ERR(wdev->base);
wdev->wdog.info = &omap_wdt_info;
wdev->wdog.ops = &omap_wdt_ops;
wdev->wdog.min_timeout = TIMER_MARGIN_MIN;
wdev->wdog.max_timeout = TIMER_MARGIN_MAX;
wdev->wdog.parent = &pdev->dev;
if (watchdog_init_timeout(&wdev->wdog, timer_margin, &pdev->dev) < 0)
wdev->wdog.timeout = TIMER_MARGIN_DEFAULT;
watchdog_set_nowayout(&wdev->wdog, nowayout);
platform_set_drvdata(pdev, wdev);
pm_runtime_enable(wdev->dev);
pm_runtime_get_sync(wdev->dev);
if (pdata && pdata->read_reset_sources) {
u32 rs = pdata->read_reset_sources();
if (rs & (1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT))
wdev->wdog.bootstatus = WDIOF_CARDRESET;
}
omap_wdt_disable(wdev);
ret = watchdog_register_device(&wdev->wdog);
if (ret) {
pm_runtime_disable(wdev->dev);
return ret;
}
pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
readl_relaxed(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
wdev->wdog.timeout);
pm_runtime_put_sync(wdev->dev);
if (early_enable)
omap_wdt_start(&wdev->wdog);
return 0;
}
static int omap_wdt_probe(struct platform_device *pdev)
{
struct omap_wd_timer_platform_data *pdata = pdev->dev.platform_data;
struct watchdog_device *omap_wdt;
struct resource *res, *mem;
struct omap_wdt_dev *wdev;
u32 rs;
int ret, irq;
omap_wdt = devm_kzalloc(&pdev->dev, sizeof(*omap_wdt), GFP_KERNEL);
if (!omap_wdt)
return -ENOMEM;
/* reserve static register mappings */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENOENT;
mem = devm_request_mem_region(&pdev->dev, res->start,
resource_size(res), pdev->name);
if (!mem)
return -EBUSY;
wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
if (!wdev)
return -ENOMEM;
wdev->omap_wdt_users = false;
wdev->mem = mem;
wdev->dev = &pdev->dev;
wdev->wdt_trgr_pattern = 0x1234;
mutex_init(&wdev->lock);
wdev->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!wdev->base)
return -ENOMEM;
if (pdev->dev.of_node) {
if (of_device_is_compatible(pdev->dev.of_node, "ti,omap3-wdt"))
kernelpet = 0;
} else {
if (pdata->ip_rev == WDTIMER2_IP3)
kernelpet = 0;
}
if (kernelpet) {
irq = platform_get_irq(pdev, 0);
ret = devm_request_irq(&pdev->dev, irq, omap_wdt_interrupt, 0,
dev_name(&pdev->dev), omap_wdt);
if (ret < 0)
dev_err(&pdev->dev, "can't get irq %d, err %d\n",
irq, ret);
}
omap_wdt->info = &omap_wdt_info;
omap_wdt->ops = &omap_wdt_ops;
omap_wdt->min_timeout = TIMER_MARGIN_MIN;
omap_wdt->max_timeout = TIMER_MARGIN_MAX;
if (timer_margin >= TIMER_MARGIN_MIN &&
timer_margin <= TIMER_MARGIN_MAX)
omap_wdt->timeout = timer_margin;
else
omap_wdt->timeout = TIMER_MARGIN_DEFAULT;
watchdog_set_drvdata(omap_wdt, wdev);
watchdog_set_nowayout(omap_wdt, nowayout);
platform_set_drvdata(pdev, omap_wdt);
pm_runtime_enable(wdev->dev);
pm_runtime_get_sync(wdev->dev);
if (pdata && pdata->read_reset_sources)
rs = pdata->read_reset_sources();
else
rs = 0;
omap_wdt->bootstatus = (rs & (1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT)) ?
WDIOF_CARDRESET : 0;
omap_wdt_disable(wdev);
ret = watchdog_register_device(omap_wdt);
if (ret) {
pm_runtime_disable(wdev->dev);
return ret;
}
pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
__raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
omap_wdt->timeout);
pm_runtime_put_sync(wdev->dev);
if (kernelpet) {
ret = omap_wdt_start(omap_wdt);
if (ret == 0)
set_bit(WDOG_ACTIVE, &omap_wdt->status);
}
return 0;
}
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);
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,
};
static int __devinit omap_wdt_probe(struct platform_device *pdev)
{
struct resource *res, *mem;
struct omap_wdt_dev *wdev;
int ret;
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, res->end - res->start + 1,
pdev->name);
if (!mem) {
ret = -EBUSY;
goto err_busy;
}
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->ick = clk_get(&pdev->dev, "ick");
if (IS_ERR(wdev->ick)) {
ret = PTR_ERR(wdev->ick);
wdev->ick = NULL;
goto err_clk;
}
wdev->fck = clk_get(&pdev->dev, "fck");
if (IS_ERR(wdev->fck)) {
ret = PTR_ERR(wdev->fck);
wdev->fck = NULL;
goto err_clk;
}
wdev->base = ioremap(res->start, res->end - res->start + 1);
if (!wdev->base) {
ret = -ENOMEM;
goto err_ioremap;
}
platform_set_drvdata(pdev, wdev);
clk_enable(wdev->ick);
clk_enable(wdev->fck);
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);
__raw_writel(0x01, wdev->base + OMAP_WATCHDOG_SYS_CONFIG);
clk_disable(wdev->ick);
clk_disable(wdev->fck);
omap_wdt_dev = pdev;
return 0;
err_misc:
platform_set_drvdata(pdev, NULL);
iounmap(wdev->base);
err_ioremap:
wdev->base = NULL;
err_clk:
if (wdev->ick)
clk_put(wdev->ick);
if (wdev->fck)
clk_put(wdev->fck);
kfree(wdev);
err_kzalloc:
release_mem_region(res->start, res->end - res->start + 1);
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);
}
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, res->end - res->start + 1);
platform_set_drvdata(pdev, NULL);
clk_put(wdev->ick);
clk_put(wdev->fck);
iounmap(wdev->base);
kfree(wdev);
omap_wdt_dev = NULL;
return 0;
}
#ifdef CONFIG_PM
static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users)
omap_wdt_disable(wdev);
return 0;
}
static int omap_wdt_resume(struct platform_device *pdev)
{
struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
if (wdev->omap_wdt_users) {
omap_wdt_enable(wdev);
omap_wdt_ping(wdev);
}
return 0;
}
#else
#define omap_wdt_suspend NULL
#define omap_wdt_resume NULL
#endif
static struct platform_driver omap_wdt_driver = {
.probe = omap_wdt_probe,
.remove = __devexit_p(omap_wdt_remove),
.shutdown = omap_wdt_shutdown,
.suspend = omap_wdt_suspend,
.resume = omap_wdt_resume,
.driver = {
.owner = THIS_MODULE,
.name = "omap_wdt",
},
};
static int __init omap_wdt_init(void)
{
spin_lock_init(&wdt_lock);
return platform_driver_register(&omap_wdt_driver);
}
