+++ /dev/null
-This generic GPIO watchdog is used on Huawei E970 (brcm47xx)
-
-Signed-off-by: Mathias Adam <m.adam--openwrt@adamis.de>
-
---- a/drivers/watchdog/Kconfig
-+++ b/drivers/watchdog/Kconfig
-@@ -1035,6 +1035,15 @@ config WDT_MTX1
- Hardware driver for the MTX-1 boards. This is a watchdog timer that
- will reboot the machine after a 100 seconds timer expired.
-
-+config GPIO_WDT
-+ tristate "GPIO Hardware Watchdog"
-+ help
-+ Hardware driver for GPIO-controlled watchdogs. GPIO pin and
-+ toggle interval settings are platform-specific. The driver
-+ will stop toggling the GPIO (i.e. machine reboots) after a
-+ 100 second timer expired and no process has written to
-+ /dev/watchdog during that time.
-+
- config PNX833X_WDT
- tristate "PNX833x Hardware Watchdog"
- depends on SOC_PNX8335
---- a/drivers/watchdog/Makefile
-+++ b/drivers/watchdog/Makefile
-@@ -127,6 +127,7 @@ obj-$(CONFIG_RC32434_WDT) += rc32434_wdt
- obj-$(CONFIG_INDYDOG) += indydog.o
- obj-$(CONFIG_JZ4740_WDT) += jz4740_wdt.o
- obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
-+obj-$(CONFIG_GPIO_WDT) += gpio_wdt.o
- obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
- obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
- obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
---- /dev/null
-+++ b/drivers/watchdog/gpio_wdt.c
-@@ -0,0 +1,301 @@
-+/*
-+ * Driver for GPIO-controlled Hardware Watchdogs.
-+ *
-+ * Copyright (C) 2013 Mathias Adam <m.adam--linux@adamis.de>
-+ *
-+ * Replaces mtx1_wdt (driver for the MTX-1 Watchdog):
-+ *
-+ * (C) Copyright 2005 4G Systems <info@4g-systems.biz>,
-+ * All Rights Reserved.
-+ * http://www.4g-systems.biz
-+ *
-+ * (C) Copyright 2007 OpenWrt.org, 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.
-+ *
-+ * Neither Michael Stickel nor 4G Systems admit liability nor provide
-+ * warranty for any of this software. This material is provided
-+ * "AS-IS" and at no charge.
-+ *
-+ * (c) Copyright 2005 4G Systems <info@4g-systems.biz>
-+ *
-+ * Release 0.01.
-+ * Author: Michael Stickel michael.stickel@4g-systems.biz
-+ *
-+ * Release 0.02.
-+ * Author: Florian Fainelli florian@openwrt.org
-+ * use the Linux watchdog/timer APIs
-+ *
-+ * Release 0.03.
-+ * Author: Mathias Adam <m.adam--linux@adamis.de>
-+ * make it a generic gpio watchdog driver
-+ *
-+ * The Watchdog is configured to reset the MTX-1
-+ * if it is not triggered for 100 seconds.
-+ * It should not be triggered more often than 1.6 seconds.
-+ *
-+ * A timer triggers the watchdog every 5 seconds, until
-+ * it is opened for the first time. After the first open
-+ * it MUST be triggered every 2..95 seconds.
-+ */
-+
-+#include <linux/module.h>
-+#include <linux/moduleparam.h>
-+#include <linux/types.h>
-+#include <linux/errno.h>
-+#include <linux/miscdevice.h>
-+#include <linux/fs.h>
-+#include <linux/init.h>
-+#include <linux/ioport.h>
-+#include <linux/timer.h>
-+#include <linux/completion.h>
-+#include <linux/jiffies.h>
-+#include <linux/watchdog.h>
-+#include <linux/platform_device.h>
-+#include <linux/io.h>
-+#include <linux/uaccess.h>
-+#include <linux/gpio.h>
-+#include <linux/gpio_wdt.h>
-+
-+static int ticks = 100 * HZ;
-+
-+static struct {
-+ struct completion stop;
-+ spinlock_t lock;
-+ int running;
-+ struct timer_list timer;
-+ int queue;
-+ int default_ticks;
-+ unsigned long inuse;
-+ unsigned gpio;
-+ unsigned int gstate;
-+ int interval;
-+ int first_interval;
-+} gpio_wdt_device;
-+
-+static void gpio_wdt_trigger(unsigned long unused)
-+{
-+ spin_lock(&gpio_wdt_device.lock);
-+ if (gpio_wdt_device.running && ticks > 0)
-+ ticks -= gpio_wdt_device.interval;
-+
-+ /* toggle wdt gpio */
-+ gpio_wdt_device.gstate = !gpio_wdt_device.gstate;
-+ gpio_set_value(gpio_wdt_device.gpio, gpio_wdt_device.gstate);
-+
-+ if (gpio_wdt_device.queue && ticks > 0)
-+ mod_timer(&gpio_wdt_device.timer, jiffies + gpio_wdt_device.interval);
-+ else
-+ complete(&gpio_wdt_device.stop);
-+ spin_unlock(&gpio_wdt_device.lock);
-+}
-+
-+static void gpio_wdt_reset(void)
-+{
-+ ticks = gpio_wdt_device.default_ticks;
-+}
-+
-+
-+static void gpio_wdt_start(void)
-+{
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&gpio_wdt_device.lock, flags);
-+ if (!gpio_wdt_device.queue) {
-+ gpio_wdt_device.queue = 1;
-+ gpio_wdt_device.gstate = 1;
-+ gpio_set_value(gpio_wdt_device.gpio, 1);
-+ mod_timer(&gpio_wdt_device.timer, jiffies + gpio_wdt_device.first_interval);
-+ }
-+ gpio_wdt_device.running++;
-+ spin_unlock_irqrestore(&gpio_wdt_device.lock, flags);
-+}
-+
-+static int gpio_wdt_stop(void)
-+{
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&gpio_wdt_device.lock, flags);
-+ if (gpio_wdt_device.queue) {
-+ gpio_wdt_device.queue = 0;
-+ gpio_wdt_device.gstate = 0;
-+ gpio_set_value(gpio_wdt_device.gpio, 0);
-+ }
-+ ticks = gpio_wdt_device.default_ticks;
-+ spin_unlock_irqrestore(&gpio_wdt_device.lock, flags);
-+ return 0;
-+}
-+
-+/* Filesystem functions */
-+
-+static int gpio_wdt_open(struct inode *inode, struct file *file)
-+{
-+ if (test_and_set_bit(0, &gpio_wdt_device.inuse))
-+ return -EBUSY;
-+ return nonseekable_open(inode, file);
-+}
-+
-+
-+static int gpio_wdt_release(struct inode *inode, struct file *file)
-+{
-+ clear_bit(0, &gpio_wdt_device.inuse);
-+ return 0;
-+}
-+
-+static long gpio_wdt_ioctl(struct file *file, unsigned int cmd,
-+ unsigned long arg)
-+{
-+ void __user *argp = (void __user *)arg;
-+ int __user *p = (int __user *)argp;
-+ unsigned int value;
-+ static const struct watchdog_info ident = {
-+ .options = WDIOF_CARDRESET,
-+ .identity = "GPIO WDT",
-+ };
-+
-+ switch (cmd) {
-+ case WDIOC_GETSUPPORT:
-+ if (copy_to_user(argp, &ident, sizeof(ident)))
-+ return -EFAULT;
-+ break;
-+ case WDIOC_GETSTATUS:
-+ case WDIOC_GETBOOTSTATUS:
-+ put_user(0, p);
-+ break;
-+ case WDIOC_SETOPTIONS:
-+ if (get_user(value, p))
-+ return -EFAULT;
-+ if (value & WDIOS_ENABLECARD)
-+ gpio_wdt_start();
-+ else if (value & WDIOS_DISABLECARD)
-+ gpio_wdt_stop();
-+ else
-+ return -EINVAL;
-+ return 0;
-+ case WDIOC_KEEPALIVE:
-+ gpio_wdt_reset();
-+ break;
-+ default:
-+ return -ENOTTY;
-+ }
-+ return 0;
-+}
-+
-+
-+static ssize_t gpio_wdt_write(struct file *file, const char *buf,
-+ size_t count, loff_t *ppos)
-+{
-+ if (!count)
-+ return -EIO;
-+ gpio_wdt_reset();
-+ return count;
-+}
-+
-+static const struct file_operations gpio_wdt_fops = {
-+ .owner = THIS_MODULE,
-+ .llseek = no_llseek,
-+ .unlocked_ioctl = gpio_wdt_ioctl,
-+ .open = gpio_wdt_open,
-+ .write = gpio_wdt_write,
-+ .release = gpio_wdt_release,
-+};
-+
-+
-+static struct miscdevice gpio_wdt_misc = {
-+ .minor = WATCHDOG_MINOR,
-+ .name = "watchdog",
-+ .fops = &gpio_wdt_fops,
-+};
-+
-+
-+static int gpio_wdt_probe(struct platform_device *pdev)
-+{
-+ int ret;
-+ struct gpio_wdt_platform_data *gpio_wdt_data = pdev->dev.platform_data;
-+
-+ gpio_wdt_device.gpio = gpio_wdt_data->gpio;
-+ gpio_wdt_device.interval = gpio_wdt_data->interval;
-+ gpio_wdt_device.first_interval = gpio_wdt_data->first_interval;
-+ if (gpio_wdt_device.first_interval <= 0) {
-+ gpio_wdt_device.first_interval = gpio_wdt_device.interval;
-+ }
-+
-+ ret = gpio_request(gpio_wdt_device.gpio, "gpio-wdt");
-+ if (ret < 0) {
-+ dev_err(&pdev->dev, "failed to request gpio");
-+ return ret;
-+ }
-+
-+ spin_lock_init(&gpio_wdt_device.lock);
-+ init_completion(&gpio_wdt_device.stop);
-+ gpio_wdt_device.queue = 0;
-+ clear_bit(0, &gpio_wdt_device.inuse);
-+ setup_timer(&gpio_wdt_device.timer, gpio_wdt_trigger, 0L);
-+ gpio_wdt_device.default_ticks = ticks;
-+
-+ gpio_wdt_start();
-+ dev_info(&pdev->dev, "GPIO Hardware Watchdog driver (gpio=%i interval=%i/%i)\n",
-+ gpio_wdt_data->gpio, gpio_wdt_data->first_interval, gpio_wdt_data->interval);
-+ return 0;
-+}
-+
-+static int gpio_wdt_remove(struct platform_device *pdev)
-+{
-+ /* FIXME: do we need to lock this test ? */
-+ if (gpio_wdt_device.queue) {
-+ gpio_wdt_device.queue = 0;
-+ wait_for_completion(&gpio_wdt_device.stop);
-+ }
-+
-+ gpio_free(gpio_wdt_device.gpio);
-+ misc_deregister(&gpio_wdt_misc);
-+ return 0;
-+}
-+
-+static struct platform_driver gpio_wdt_driver = {
-+ .probe = gpio_wdt_probe,
-+ .remove = gpio_wdt_remove,
-+ .driver.name = "gpio-wdt",
-+ .driver.owner = THIS_MODULE,
-+};
-+
-+static int __init gpio_wdt_init(void)
-+{
-+ return platform_driver_register(&gpio_wdt_driver);
-+}
-+arch_initcall(gpio_wdt_init);
-+
-+/*
-+ * We do wdt initialization in two steps: arch_initcall probes the wdt
-+ * very early to start pinging the watchdog (misc devices are not yet
-+ * available), and later module_init() just registers the misc device.
-+ */
-+static int gpio_wdt_init_late(void)
-+{
-+ int ret;
-+
-+ ret = misc_register(&gpio_wdt_misc);
-+ if (ret < 0) {
-+ pr_err("GPIO_WDT: failed to register misc device\n");
-+ return ret;
-+ }
-+ return 0;
-+}
-+#ifndef MODULE
-+module_init(gpio_wdt_init_late);
-+#endif
-+
-+static void __exit gpio_wdt_exit(void)
-+{
-+ platform_driver_unregister(&gpio_wdt_driver);
-+}
-+module_exit(gpio_wdt_exit);
-+
-+MODULE_AUTHOR("Michael Stickel, Florian Fainelli, Mathias Adam");
-+MODULE_DESCRIPTION("Driver for GPIO hardware watchdogs");
-+MODULE_LICENSE("GPL");
-+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
-+MODULE_ALIAS("platform:gpio-wdt");
---- /dev/null
-+++ b/include/linux/gpio_wdt.h
-@@ -0,0 +1,21 @@
-+/*
-+ * Definitions for the GPIO watchdog driver
-+ *
-+ * Copyright (C) 2013 Mathias Adam <m.adam--linux@adamis.de>
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License version 2 as
-+ * published by the Free Software Foundation.
-+ *
-+ */
-+
-+#ifndef _GPIO_WDT_H_
-+#define _GPIO_WDT_H_
-+
-+struct gpio_wdt_platform_data {
-+ int gpio; /* GPIO line number */
-+ int interval; /* watchdog reset interval in system ticks */
-+ int first_interval; /* first wd reset interval in system ticks */
-+};
-+
-+#endif /* _GPIO_WDT_H_ */
projects / openwrt / svn-archive / archive.git / blobdiff