Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 250 insertions, 0 deletions

diff --git a/drivers/watchdog/mtx-1_wdt.c b/drivers/watchdog/mtx-1_wdt.c
new file mode 100644
index 000000000..1fa7d2b32
--- /dev/null
+++ b/drivers/watchdog/mtx-1_wdt.c
@@ -0,0 +1,250 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *      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>
+ *      (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
+ *
+ *      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/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 <asm/mach-au1x00/au1000.h>
+
+#define MTX1_WDT_INTERVAL	(5 * HZ)
+
+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;
+} mtx1_wdt_device;
+
+static void mtx1_wdt_trigger(struct timer_list *unused)
+{
+	spin_lock(&mtx1_wdt_device.lock);
+	if (mtx1_wdt_device.running)
+		ticks--;
+
+	/* toggle wdt gpio */
+	mtx1_wdt_device.gstate = !mtx1_wdt_device.gstate;
+	gpio_set_value(mtx1_wdt_device.gpio, mtx1_wdt_device.gstate);
+
+	if (mtx1_wdt_device.queue && ticks)
+		mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
+	else
+		complete(&mtx1_wdt_device.stop);
+	spin_unlock(&mtx1_wdt_device.lock);
+}
+
+static void mtx1_wdt_reset(void)
+{
+	ticks = mtx1_wdt_device.default_ticks;
+}
+
+
+static void mtx1_wdt_start(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&mtx1_wdt_device.lock, flags);
+	if (!mtx1_wdt_device.queue) {
+		mtx1_wdt_device.queue = 1;
+		mtx1_wdt_device.gstate = 1;
+		gpio_set_value(mtx1_wdt_device.gpio, 1);
+		mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
+	}
+	mtx1_wdt_device.running++;
+	spin_unlock_irqrestore(&mtx1_wdt_device.lock, flags);
+}
+
+static int mtx1_wdt_stop(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&mtx1_wdt_device.lock, flags);
+	if (mtx1_wdt_device.queue) {
+		mtx1_wdt_device.queue = 0;
+		mtx1_wdt_device.gstate = 0;
+		gpio_set_value(mtx1_wdt_device.gpio, 0);
+	}
+	ticks = mtx1_wdt_device.default_ticks;
+	spin_unlock_irqrestore(&mtx1_wdt_device.lock, flags);
+	return 0;
+}
+
+/* Filesystem functions */
+
+static int mtx1_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &mtx1_wdt_device.inuse))
+		return -EBUSY;
+	return nonseekable_open(inode, file);
+}
+
+
+static int mtx1_wdt_release(struct inode *inode, struct file *file)
+{
+	clear_bit(0, &mtx1_wdt_device.inuse);
+	return 0;
+}
+
+static long mtx1_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 = "MTX-1 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)
+			mtx1_wdt_start();
+		else if (value & WDIOS_DISABLECARD)
+			mtx1_wdt_stop();
+		else
+			return -EINVAL;
+		return 0;
+	case WDIOC_KEEPALIVE:
+		mtx1_wdt_reset();
+		break;
+	default:
+		return -ENOTTY;
+	}
+	return 0;
+}
+
+
+static ssize_t mtx1_wdt_write(struct file *file, const char *buf,
+						size_t count, loff_t *ppos)
+{
+	if (!count)
+		return -EIO;
+	mtx1_wdt_reset();
+	return count;
+}
+
+static const struct file_operations mtx1_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.unlocked_ioctl	= mtx1_wdt_ioctl,
+	.open		= mtx1_wdt_open,
+	.write		= mtx1_wdt_write,
+	.release	= mtx1_wdt_release,
+};
+
+
+static struct miscdevice mtx1_wdt_misc = {
+	.minor	= WATCHDOG_MINOR,
+	.name	= "watchdog",
+	.fops	= &mtx1_wdt_fops,
+};
+
+
+static int mtx1_wdt_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	mtx1_wdt_device.gpio = pdev->resource[0].start;
+	ret = devm_gpio_request_one(&pdev->dev, mtx1_wdt_device.gpio,
+				GPIOF_OUT_INIT_HIGH, "mtx1-wdt");
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to request gpio");
+		return ret;
+	}
+
+	spin_lock_init(&mtx1_wdt_device.lock);
+	init_completion(&mtx1_wdt_device.stop);
+	mtx1_wdt_device.queue = 0;
+	clear_bit(0, &mtx1_wdt_device.inuse);
+	timer_setup(&mtx1_wdt_device.timer, mtx1_wdt_trigger, 0);
+	mtx1_wdt_device.default_ticks = ticks;
+
+	ret = misc_register(&mtx1_wdt_misc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to register\n");
+		return ret;
+	}
+	mtx1_wdt_start();
+	dev_info(&pdev->dev, "MTX-1 Watchdog driver\n");
+	return 0;
+}
+
+static int mtx1_wdt_remove(struct platform_device *pdev)
+{
+	/* FIXME: do we need to lock this test ? */
+	if (mtx1_wdt_device.queue) {
+		mtx1_wdt_device.queue = 0;
+		wait_for_completion(&mtx1_wdt_device.stop);
+	}
+
+	misc_deregister(&mtx1_wdt_misc);
+	return 0;
+}
+
+static struct platform_driver mtx1_wdt_driver = {
+	.probe = mtx1_wdt_probe,
+	.remove = mtx1_wdt_remove,
+	.driver.name = "mtx1-wdt",
+	.driver.owner = THIS_MODULE,
+};
+
+module_platform_driver(mtx1_wdt_driver);
+
+MODULE_AUTHOR("Michael Stickel, Florian Fainelli");
+MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mtx1-wdt");