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@@ -0,0 +1,360 @@
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+This generic GPIO watchdog is used on Huawei E970 (brcm47xx)
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+
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+Signed-off-by: Mathias Adam <[email protected]>
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+
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+--- a/drivers/watchdog/Kconfig
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++++ b/drivers/watchdog/Kconfig
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+@@ -1035,6 +1035,15 @@ config WDT_MTX1
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+ Hardware driver for the MTX-1 boards. This is a watchdog timer that
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+ will reboot the machine after a 100 seconds timer expired.
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+
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++config GPIO_WDT
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++ tristate "GPIO Hardware Watchdog"
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++ help
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++ Hardware driver for GPIO-controlled watchdogs. GPIO pin and
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++ toggle interval settings are platform-specific. The driver
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++ will stop toggling the GPIO (i.e. machine reboots) after a
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++ 100 second timer expired and no process has written to
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++ /dev/watchdog during that time.
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++
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+ config PNX833X_WDT
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+ tristate "PNX833x Hardware Watchdog"
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+ depends on SOC_PNX8335
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+--- a/drivers/watchdog/Makefile
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++++ b/drivers/watchdog/Makefile
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+@@ -127,6 +127,7 @@ obj-$(CONFIG_RC32434_WDT) += rc32434_wdt
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+ obj-$(CONFIG_INDYDOG) += indydog.o
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+ obj-$(CONFIG_JZ4740_WDT) += jz4740_wdt.o
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+ obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
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++obj-$(CONFIG_GPIO_WDT) += gpio_wdt.o
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+ obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
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+ obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
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+ obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
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+--- /dev/null
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++++ b/drivers/watchdog/gpio_wdt.c
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+@@ -0,0 +1,301 @@
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++/*
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++ * Driver for GPIO-controlled Hardware Watchdogs.
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++ *
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++ * Copyright (C) 2013 Mathias Adam <[email protected]>
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++ *
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++ * Replaces mtx1_wdt (driver for the MTX-1 Watchdog):
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++ *
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++ * (C) Copyright 2005 4G Systems <[email protected]>,
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++ * All Rights Reserved.
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++ * http://www.4g-systems.biz
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++ *
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++ * (C) Copyright 2007 OpenWrt.org, Florian Fainelli <[email protected]>
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++ *
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++ * This program is free software; you can redistribute it and/or
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++ * modify it under the terms of the GNU General Public License
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++ * as published by the Free Software Foundation; either version
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++ * 2 of the License, or (at your option) any later version.
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++ *
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++ * Neither Michael Stickel nor 4G Systems admit liability nor provide
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++ * warranty for any of this software. This material is provided
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++ * "AS-IS" and at no charge.
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++ *
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++ * (c) Copyright 2005 4G Systems <[email protected]>
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++ *
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++ * Release 0.01.
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++ * Author: Michael Stickel [email protected]
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++ *
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++ * Release 0.02.
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++ * Author: Florian Fainelli [email protected]
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++ * use the Linux watchdog/timer APIs
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++ *
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++ * Release 0.03.
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++ * Author: Mathias Adam <[email protected]>
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++ * make it a generic gpio watchdog driver
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++ *
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++ * The Watchdog is configured to reset the MTX-1
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++ * if it is not triggered for 100 seconds.
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++ * It should not be triggered more often than 1.6 seconds.
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++ *
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++ * A timer triggers the watchdog every 5 seconds, until
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++ * it is opened for the first time. After the first open
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++ * it MUST be triggered every 2..95 seconds.
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++ */
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++
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++#include <linux/module.h>
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++#include <linux/moduleparam.h>
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++#include <linux/types.h>
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++#include <linux/errno.h>
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++#include <linux/miscdevice.h>
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++#include <linux/fs.h>
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++#include <linux/init.h>
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++#include <linux/ioport.h>
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++#include <linux/timer.h>
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++#include <linux/completion.h>
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++#include <linux/jiffies.h>
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++#include <linux/watchdog.h>
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++#include <linux/platform_device.h>
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++#include <linux/io.h>
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++#include <linux/uaccess.h>
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++#include <linux/gpio.h>
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++#include <linux/gpio_wdt.h>
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++
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++static int ticks = 100 * HZ;
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++
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++static struct {
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++ struct completion stop;
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++ spinlock_t lock;
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++ int running;
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++ struct timer_list timer;
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++ int queue;
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++ int default_ticks;
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++ unsigned long inuse;
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++ unsigned gpio;
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++ unsigned int gstate;
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++ int interval;
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++ int first_interval;
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++} gpio_wdt_device;
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++
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++static void gpio_wdt_trigger(unsigned long unused)
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++{
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++ spin_lock(&gpio_wdt_device.lock);
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++ if (gpio_wdt_device.running && ticks > 0)
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++ ticks -= gpio_wdt_device.interval;
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++
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++ /* toggle wdt gpio */
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++ gpio_wdt_device.gstate = !gpio_wdt_device.gstate;
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++ gpio_set_value(gpio_wdt_device.gpio, gpio_wdt_device.gstate);
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++
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++ if (gpio_wdt_device.queue && ticks > 0)
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++ mod_timer(&gpio_wdt_device.timer, jiffies + gpio_wdt_device.interval);
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++ else
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++ complete(&gpio_wdt_device.stop);
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++ spin_unlock(&gpio_wdt_device.lock);
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++}
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++
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++static void gpio_wdt_reset(void)
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++{
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++ ticks = gpio_wdt_device.default_ticks;
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++}
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++
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++
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++static void gpio_wdt_start(void)
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++{
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++ unsigned long flags;
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++
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++ spin_lock_irqsave(&gpio_wdt_device.lock, flags);
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++ if (!gpio_wdt_device.queue) {
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++ gpio_wdt_device.queue = 1;
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++ gpio_wdt_device.gstate = 1;
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++ gpio_set_value(gpio_wdt_device.gpio, 1);
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++ mod_timer(&gpio_wdt_device.timer, jiffies + gpio_wdt_device.first_interval);
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++ }
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++ gpio_wdt_device.running++;
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++ spin_unlock_irqrestore(&gpio_wdt_device.lock, flags);
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++}
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++
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++static int gpio_wdt_stop(void)
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++{
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++ unsigned long flags;
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++
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++ spin_lock_irqsave(&gpio_wdt_device.lock, flags);
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++ if (gpio_wdt_device.queue) {
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++ gpio_wdt_device.queue = 0;
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++ gpio_wdt_device.gstate = 0;
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++ gpio_set_value(gpio_wdt_device.gpio, 0);
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++ }
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++ ticks = gpio_wdt_device.default_ticks;
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++ spin_unlock_irqrestore(&gpio_wdt_device.lock, flags);
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++ return 0;
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++}
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++
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++/* Filesystem functions */
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++
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++static int gpio_wdt_open(struct inode *inode, struct file *file)
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++{
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++ if (test_and_set_bit(0, &gpio_wdt_device.inuse))
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++ return -EBUSY;
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++ return nonseekable_open(inode, file);
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++}
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++
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++
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++static int gpio_wdt_release(struct inode *inode, struct file *file)
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++{
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++ clear_bit(0, &gpio_wdt_device.inuse);
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++ return 0;
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++}
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++
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++static long gpio_wdt_ioctl(struct file *file, unsigned int cmd,
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++ unsigned long arg)
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++{
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++ void __user *argp = (void __user *)arg;
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++ int __user *p = (int __user *)argp;
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++ unsigned int value;
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++ static const struct watchdog_info ident = {
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++ .options = WDIOF_CARDRESET,
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++ .identity = "GPIO WDT",
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++ };
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++
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++ switch (cmd) {
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++ case WDIOC_GETSUPPORT:
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++ if (copy_to_user(argp, &ident, sizeof(ident)))
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++ return -EFAULT;
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++ break;
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++ case WDIOC_GETSTATUS:
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++ case WDIOC_GETBOOTSTATUS:
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++ put_user(0, p);
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++ break;
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++ case WDIOC_SETOPTIONS:
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++ if (get_user(value, p))
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++ return -EFAULT;
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++ if (value & WDIOS_ENABLECARD)
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++ gpio_wdt_start();
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++ else if (value & WDIOS_DISABLECARD)
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++ gpio_wdt_stop();
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++ else
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++ return -EINVAL;
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++ return 0;
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++ case WDIOC_KEEPALIVE:
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++ gpio_wdt_reset();
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++ break;
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++ default:
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++ return -ENOTTY;
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++ }
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++ return 0;
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++}
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++
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++
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++static ssize_t gpio_wdt_write(struct file *file, const char *buf,
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++ size_t count, loff_t *ppos)
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++{
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++ if (!count)
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++ return -EIO;
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++ gpio_wdt_reset();
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++ return count;
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++}
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++
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++static const struct file_operations gpio_wdt_fops = {
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++ .owner = THIS_MODULE,
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++ .llseek = no_llseek,
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++ .unlocked_ioctl = gpio_wdt_ioctl,
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++ .open = gpio_wdt_open,
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++ .write = gpio_wdt_write,
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++ .release = gpio_wdt_release,
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++};
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++
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++
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++static struct miscdevice gpio_wdt_misc = {
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++ .minor = WATCHDOG_MINOR,
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++ .name = "watchdog",
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++ .fops = &gpio_wdt_fops,
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++};
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++
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++
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++static int gpio_wdt_probe(struct platform_device *pdev)
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++{
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++ int ret;
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++ struct gpio_wdt_platform_data *gpio_wdt_data = pdev->dev.platform_data;
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++
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++ gpio_wdt_device.gpio = gpio_wdt_data->gpio;
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++ gpio_wdt_device.interval = gpio_wdt_data->interval;
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++ gpio_wdt_device.first_interval = gpio_wdt_data->first_interval;
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++ if (gpio_wdt_device.first_interval <= 0) {
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++ gpio_wdt_device.first_interval = gpio_wdt_device.interval;
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++ }
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++
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++ ret = gpio_request(gpio_wdt_device.gpio, "gpio-wdt");
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++ if (ret < 0) {
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++ dev_err(&pdev->dev, "failed to request gpio");
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++ return ret;
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++ }
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++
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++ spin_lock_init(&gpio_wdt_device.lock);
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++ init_completion(&gpio_wdt_device.stop);
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++ gpio_wdt_device.queue = 0;
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++ clear_bit(0, &gpio_wdt_device.inuse);
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++ setup_timer(&gpio_wdt_device.timer, gpio_wdt_trigger, 0L);
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++ gpio_wdt_device.default_ticks = ticks;
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++
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++ gpio_wdt_start();
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++ dev_info(&pdev->dev, "GPIO Hardware Watchdog driver (gpio=%i interval=%i/%i)\n",
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++ gpio_wdt_data->gpio, gpio_wdt_data->first_interval, gpio_wdt_data->interval);
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++ return 0;
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++}
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++
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++static int gpio_wdt_remove(struct platform_device *pdev)
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++{
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++ /* FIXME: do we need to lock this test ? */
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++ if (gpio_wdt_device.queue) {
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++ gpio_wdt_device.queue = 0;
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++ wait_for_completion(&gpio_wdt_device.stop);
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++ }
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++
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++ gpio_free(gpio_wdt_device.gpio);
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++ misc_deregister(&gpio_wdt_misc);
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++ return 0;
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++}
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++
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++static struct platform_driver gpio_wdt_driver = {
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++ .probe = gpio_wdt_probe,
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++ .remove = gpio_wdt_remove,
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++ .driver.name = "gpio-wdt",
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++ .driver.owner = THIS_MODULE,
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++};
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++
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++static int __init gpio_wdt_init(void)
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++{
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++ return platform_driver_register(&gpio_wdt_driver);
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++}
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++arch_initcall(gpio_wdt_init);
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++
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++/*
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++ * We do wdt initialization in two steps: arch_initcall probes the wdt
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++ * very early to start pinging the watchdog (misc devices are not yet
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++ * available), and later module_init() just registers the misc device.
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++ */
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++static int gpio_wdt_init_late(void)
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++{
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++ int ret;
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++
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++ ret = misc_register(&gpio_wdt_misc);
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++ if (ret < 0) {
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++ pr_err("GPIO_WDT: failed to register misc device\n");
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++ return ret;
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++ }
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++ return 0;
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++}
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++#ifndef MODULE
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++module_init(gpio_wdt_init_late);
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++#endif
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++
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++static void __exit gpio_wdt_exit(void)
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++{
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++ platform_driver_unregister(&gpio_wdt_driver);
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++}
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++module_exit(gpio_wdt_exit);
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++
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++MODULE_AUTHOR("Michael Stickel, Florian Fainelli, Mathias Adam");
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++MODULE_DESCRIPTION("Driver for GPIO hardware watchdogs");
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++MODULE_LICENSE("GPL");
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++MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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++MODULE_ALIAS("platform:gpio-wdt");
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+--- /dev/null
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++++ b/include/linux/gpio_wdt.h
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+@@ -0,0 +1,21 @@
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++/*
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++ * Definitions for the GPIO watchdog driver
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++ *
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++ * Copyright (C) 2013 Mathias Adam <[email protected]>
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++ *
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++ * This program is free software; you can redistribute it and/or modify
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++ * it under the terms of the GNU General Public License version 2 as
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++ * published by the Free Software Foundation.
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++ *
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++ */
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++
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++#ifndef _GPIO_WDT_H_
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++#define _GPIO_WDT_H_
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++
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++struct gpio_wdt_platform_data {
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++ int gpio; /* GPIO line number */
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++ int interval; /* watchdog reset interval in system ticks */
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++ int first_interval; /* first wd reset interval in system ticks */
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++};
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++
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++#endif /* _GPIO_WDT_H_ */
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Hauke Mehrtens