361 lines
9.8 KiB
Diff
361 lines
9.8 KiB
Diff
This generic GPIO watchdog is used on Huawei E970 (brcm47xx)
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Signed-off-by: Mathias Adam <m.adam--openwrt@adamis.de>
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--- a/drivers/watchdog/Kconfig
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+++ b/drivers/watchdog/Kconfig
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@@ -1065,6 +1065,15 @@ 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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+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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@@ -129,6 +129,7 @@ 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 <m.adam--linux@adamis.de>
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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 <info@4g-systems.biz>,
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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 <florian@openwrt.org>
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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 <info@4g-systems.biz>
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+ *
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+ * Release 0.01.
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+ * Author: Michael Stickel michael.stickel@4g-systems.biz
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+ *
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+ * Release 0.02.
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+ * Author: Florian Fainelli florian@openwrt.org
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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 <m.adam--linux@adamis.de>
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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 <m.adam--linux@adamis.de>
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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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