--- /dev/null
+/*
+ * RDC321x watchdog driver
+ *
+ * Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/timer.h>
+#include <linux/watchdog.h>
+#include <linux/uaccess.h>
+#include <linux/pci.h>
+
+#include <asm/rdc321x_defs.h>
+
+extern int rdc321x_pci_write(int reg, u32 val);
+extern int rdc321x_pci_read(int reg, u32 *val);
+
+#define RDC321X_WDT_REG 0x00000044
+
+#define RDC_WDT_EN 0x00800000 /* Enable bit */
+#define RDC_WDT_WDTIRQ 0x00400000 /* Create WDT IRQ before CPU reset */
+#define RDC_WDT_NMIIRQ 0x00200000 /* Create NMI IRQ before CPU reset */
+#define RDC_WDT_RST 0x00100000 /* Reset wdt */
+#define RDC_WDT_NIF 0x00080000 /* NMI interrupt occured */
+#define RDC_WDT_WIF 0x00040000 /* WDT interrupt occured */
+#define RDC_WDT_IRT 0x00000700 /* IRQ Routing table */
+#define RDC_WDT_CNT 0x0000007F /* WDT count */
+
+/* default counter value (2.34 s) */
+#define RDC_WDT_DFLT_CNT 0x00000040
+
+#define RDC_WDT_SETUP (RDC_WDT_EN | RDC_WDT_NMIIRQ | RDC_WDT_RST | RDC_WDT_DFLT_CNT)
+
+/* some device data */
+static struct {
+ struct timer_list timer;
+ int seconds_left;
+ int total_seconds;
+ bool inuse;
+ bool running;
+ bool close_expected;
+} rdc321x_wdt_dev;
+
+static struct watchdog_info ident = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+ .identity = "RDC321x WDT",
+};
+
+/* generic helper functions */
+static void rdc321x_wdt_timer(unsigned long unused)
+{
+ if (!rdc321x_wdt_dev.running) {
+ rdc321x_pci_write(RDC321X_WDT_REG, 0);
+ return;
+ }
+
+ rdc321x_wdt_dev.seconds_left--;
+
+ if (rdc321x_wdt_dev.seconds_left < 1)
+ return;
+
+ rdc321x_pci_write(RDC321X_WDT_REG, RDC_WDT_SETUP);
+
+ mod_timer(&rdc321x_wdt_dev.timer, HZ * 2 + jiffies);
+}
+
+static void rdc321x_wdt_reset(void)
+{
+ rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds;
+}
+
+static void rdc321x_wdt_start(void)
+{
+ if (rdc321x_wdt_dev.running)
+ return;
+
+ rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds;
+
+ rdc321x_wdt_dev.running = true;
+
+ rdc321x_wdt_timer(0);
+
+ return;
+}
+
+static int rdc321x_wdt_stop(void)
+{
+ if (WATCHDOG_NOWAYOUT)
+ return -ENOSYS;
+
+ rdc321x_wdt_dev.running = false;
+
+ return 0;
+}
+
+/* filesystem operations */
+static int rdc321x_wdt_open(struct inode *inode, struct file *file)
+{
+ if (xchg(&rdc321x_wdt_dev.inuse, true))
+ return -EBUSY;
+
+ return nonseekable_open(inode, file);
+}
+
+static int rdc321x_wdt_release(struct inode *inode, struct file *file)
+{
+ if (rdc321x_wdt_dev.close_expected)
+ rdc321x_wdt_stop();
+
+ rdc321x_wdt_dev.inuse = false;
+
+ return 0;
+}
+
+static long rdc321x_wdt_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ int value;
+
+ switch (cmd) {
+ case WDIOC_KEEPALIVE:
+ rdc321x_wdt_reset();
+ break;
+ case WDIOC_GETSUPPORT:
+ if (copy_to_user(argp, &ident, sizeof(ident)))
+ return -EFAULT;
+ break;
+ case WDIOC_SETTIMEOUT:
+ if (copy_from_user(&rdc321x_wdt_dev.total_seconds, argp, sizeof(int)))
+ return -EFAULT;
+ rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds;
+ break;
+ case WDIOC_GETTIMEOUT:
+ if (copy_to_user(argp, &rdc321x_wdt_dev.total_seconds, sizeof(int)))
+ return -EFAULT;
+ break;
+ case WDIOC_GETTIMELEFT:
+ if (copy_to_user(argp, &rdc321x_wdt_dev.seconds_left, sizeof(int)))
+ return -EFAULT;
+ break;
+ case WDIOC_SETOPTIONS:
+ if (copy_from_user(&value, argp, sizeof(int)))
+ return -EFAULT;
+ switch (value) {
+ case WDIOS_ENABLECARD:
+ rdc321x_wdt_start();
+ break;
+ case WDIOS_DISABLECARD:
+ return rdc321x_wdt_stop();
+ default:
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ size_t i;
+
+ if (!count)
+ return -EIO;
+
+ rdc321x_wdt_dev.close_expected = false;
+
+ for (i = 0; i != count; i++) {
+ char c;
+
+ if (get_user(c, buf + i))
+ return -EFAULT;
+
+ if (c == 'V') {
+ rdc321x_wdt_dev.close_expected = true;
+ break;
+ }
+ }
+
+ rdc321x_wdt_reset();
+
+ return count;
+}
+
+static const struct file_operations rdc321x_wdt_fops = {
+ .llseek = no_llseek,
+ .unlocked_ioctl = rdc321x_wdt_ioctl,
+ .open = rdc321x_wdt_open,
+ .write = rdc321x_wdt_write,
+ .release = rdc321x_wdt_release,
+};
+
+static struct miscdevice rdc321x_wdt_misc = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &rdc321x_wdt_fops,
+};
+
+static int __init rdc321x_wdt_probe(struct platform_device *pdev)
+{
+ int err;
+
+ err = rdc321x_pci_write(RDC321X_WDT_REG, 0);
+ if (err)
+ return err;
+
+ rdc321x_wdt_dev.running = false;
+ rdc321x_wdt_dev.close_expected = false;
+ rdc321x_wdt_dev.inuse = 0;
+ setup_timer(&rdc321x_wdt_dev.timer, rdc321x_wdt_timer, 0);
+ rdc321x_wdt_dev.total_seconds = 100;
+
+ err = misc_register(&rdc321x_wdt_misc);
+ if (err < 0) {
+ printk(KERN_ERR PFX "watchdog: misc_register failed\n");
+ return err;
+ }
+
+ panic_on_unrecovered_nmi = 1;
+ dev_info(&pdev->dev, "watchdog inig success\n");
+
+ return 0;
+}
+
+static int __devexit rdc321x_wdt_remove(struct platform_device *pdev)
+{
+ if (rdc321x_wdt_dev.inuse)
+ rdc321x_wdt_dev.inuse = 0;
+ misc_deregister(&rdc321x_wdt_misc);
+ return 0;
+}
+
+static struct platform_driver rdc321x_wdt_driver = {
+ .driver.name = "rdc321x-wdt",
+ .driver.owner = THIS_MODULE,
+ .probe = rdc321x_wdt_probe,
+ .remove = __devexit_p(rdc321x_wdt_remove),
+};
+
+static int __init rdc321x_wdt_init(void)
+{
+ return platform_driver_register(&rdc321x_wdt_driver);
+}
+
+static void __exit rdc321x_wdt_exit(void)
+{
+ platform_driver_unregister(&rdc321x_wdt_driver);
+}
+
+module_init(rdc321x_wdt_init);
+module_exit(rdc321x_wdt_exit);
+
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_DESCRIPTION("RDC321x Watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rdc321x-wdt");
projects / openwrt.git / blobdiff