/*
* xwdt_ioctl:
* @file: file handle to the device
* @cmd: watchdog command
* @arg: argument pointer
*
* The watchdog API defines a common set of functions for all watchdogs
* according to their available features.
*/
static long xwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int status;
union {
struct watchdog_info __user *ident;
int __user *i;
} uarg;
uarg.i = (int __user *)arg;
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(uarg.ident, &ident,
sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETBOOTSTATUS:
return put_user(xdev.boot_status, uarg.i);
case WDIOC_GETSTATUS:
xwdt_get_status(&status);
return put_user(status, uarg.i);
case WDIOC_KEEPALIVE:
xwdt_keepalive();
return 0;
case WDIOC_SETTIMEOUT:
printk(KERN_INFO "This feature is not implemented yet!\n");
case WDIOC_GETTIMEOUT:
if (no_timeout)
return -ENOTTY;
else
return put_user(timeout, uarg.i);
default:
return -ENOTTY;
}
}
static int __devinit xwdt_probe(struct platform_device *pdev)
{
int rc;
u32 *tmptr;
u32 *pfreq;
no_timeout = 0;
pfreq = (u32 *)of_get_property(pdev->dev.of_node->parent,
"clock-frequency", NULL);
if (pfreq == NULL) {
pr_warn("The watchdog clock frequency cannot be obtained!\n");
no_timeout = 1;
}
rc = of_address_to_resource(pdev->dev.of_node, 0, &xdev.res);
if (rc) {
pr_warn("invalid address!\n");
return rc;
}
tmptr = (u32 *)of_get_property(pdev->dev.of_node,
"xlnx,wdt-interval", NULL);
if (tmptr == NULL) {
pr_warn("Parameter \"xlnx,wdt-interval\" not found in device tree!\n");
no_timeout = 1;
} else {
xdev.wdt_interval = *tmptr;
}
tmptr = (u32 *)of_get_property(pdev->dev.of_node,
"xlnx,wdt-enable-once", NULL);
if (tmptr == NULL) {
pr_warn("Parameter \"xlnx,wdt-enable-once\" not found in device tree!\n");
xdev.nowayout = WATCHDOG_NOWAYOUT;
}
/*
* Twice of the 2^wdt_interval / freq because the first wdt overflow is
* ignored (interrupt), reset is only generated at second wdt overflow
*/
if (!no_timeout)
timeout = 2 * ((1<<xdev.wdt_interval) / *pfreq);
if (!request_mem_region(xdev.res.start,
xdev.res.end - xdev.res.start + 1, WATCHDOG_NAME)) {
rc = -ENXIO;
pr_err("memory request failure!\n");
goto err_out;
}
xdev.base = ioremap(xdev.res.start, xdev.res.end - xdev.res.start + 1);
if (xdev.base == NULL) {
rc = -ENOMEM;
pr_err("ioremap failure!\n");
goto release_mem;
}
rc = xwdt_selftest();
if (rc == XWT_TIMER_FAILED) {
pr_err("SelfTest routine error!\n");
goto unmap_io;
}
xwdt_get_status(&xdev.boot_status);
rc = misc_register(&xwdt_miscdev);
if (rc) {
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
xwdt_miscdev.minor, rc);
goto unmap_io;
}
if (no_timeout)
pr_info("driver loaded (timeout=? sec, nowayout=%d)\n",
xdev.nowayout);
else
pr_info("driver loaded (timeout=%d sec, nowayout=%d)\n",
timeout, xdev.nowayout);
expect_close = 0;
clear_bit(0, &driver_open);
return 0;
unmap_io:
iounmap(xdev.base);
release_mem:
release_mem_region(xdev.res.start, resource_size(&xdev.res));
err_out:
return rc;
}
