Adding upstream version 6.1.76.upstream/6.1.76

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

1 files changed, 379 insertions, 0 deletions

diff --git a/drivers/watchdog/ib700wdt.c b/drivers/watchdog/ib700wdt.c
new file mode 100644
index 000000000..a0ddedc36
--- /dev/null
+++ b/drivers/watchdog/ib700wdt.c
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *	IB700 Single Board Computer WDT driver
+ *
+ *	(c) Copyright 2001 Charles Howes <chowes@vsol.net>
+ *
+ *	Based on advantechwdt.c which is based on acquirewdt.c which
+ *	is based on wdt.c.
+ *
+ *	(c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
+ *
+ *	Based on acquirewdt.c which is based on wdt.c.
+ *	Original copyright messages:
+ *
+ *	(c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
+ *						All Rights Reserved.
+ *
+ *	Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
+ *	warranty for any of this software. This material is provided
+ *	"AS-IS" and at no charge.
+ *
+ *	(c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ *	14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ *	     Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ *	     Added timeout module option to override default
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/ioport.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+
+static struct platform_device *ibwdt_platform_device;
+static unsigned long ibwdt_is_open;
+static DEFINE_SPINLOCK(ibwdt_lock);
+static char expect_close;
+
+/* Module information */
+#define DRV_NAME "ib700wdt"
+
+/*
+ *
+ * Watchdog Timer Configuration
+ *
+ * The function of the watchdog timer is to reset the system
+ * automatically and is defined at I/O port 0443H.  To enable the
+ * watchdog timer and allow the system to reset, write I/O port 0443H.
+ * To disable the timer, write I/O port 0441H for the system to stop the
+ * watchdog function.  The timer has a tolerance of 20% for its
+ * intervals.
+ *
+ * The following describes how the timer should be programmed.
+ *
+ * Enabling Watchdog:
+ * MOV AX,000FH (Choose the values from 0 to F)
+ * MOV DX,0443H
+ * OUT DX,AX
+ *
+ * Disabling Watchdog:
+ * MOV AX,000FH (Any value is fine.)
+ * MOV DX,0441H
+ * OUT DX,AX
+ *
+ * Watchdog timer control table:
+ * Level   Value  Time/sec | Level Value Time/sec
+ *   1       F       0     |   9     7      16
+ *   2       E       2     |   10    6      18
+ *   3       D       4     |   11    5      20
+ *   4       C       6     |   12    4      22
+ *   5       B       8     |   13    3      24
+ *   6       A       10    |   14    2      26
+ *   7       9       12    |   15    1      28
+ *   8       8       14    |   16    0      30
+ *
+ */
+
+#define WDT_STOP 0x441
+#define WDT_START 0x443
+
+/* Default timeout */
+#define WATCHDOG_TIMEOUT 30		/* 30 seconds +/- 20% */
+static int timeout = WATCHDOG_TIMEOUT;	/* in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+	"Watchdog timeout in seconds. 0<= timeout <=30, default="
+		__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+		"Watchdog cannot be stopped once started (default="
+				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+
+/*
+ *	Watchdog Operations
+ */
+
+static void ibwdt_ping(void)
+{
+	int wd_margin = 15 - ((timeout + 1) / 2);
+
+	spin_lock(&ibwdt_lock);
+
+	/* Write a watchdog value */
+	outb_p(wd_margin, WDT_START);
+
+	spin_unlock(&ibwdt_lock);
+}
+
+static void ibwdt_disable(void)
+{
+	spin_lock(&ibwdt_lock);
+	outb_p(0, WDT_STOP);
+	spin_unlock(&ibwdt_lock);
+}
+
+static int ibwdt_set_heartbeat(int t)
+{
+	if (t < 0 || t > 30)
+		return -EINVAL;
+
+	timeout = t;
+	return 0;
+}
+
+/*
+ *	/dev/watchdog handling
+ */
+
+static ssize_t ibwdt_write(struct file *file, const char __user *buf,
+						size_t count, loff_t *ppos)
+{
+	if (count) {
+		if (!nowayout) {
+			size_t i;
+
+			/* In case it was set long ago */
+			expect_close = 0;
+
+			for (i = 0; i != count; i++) {
+				char c;
+				if (get_user(c, buf + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 42;
+			}
+		}
+		ibwdt_ping();
+	}
+	return count;
+}
+
+static long ibwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int new_margin;
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+
+	static const struct watchdog_info ident = {
+		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
+							| WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "IB700 WDT",
+	};
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		if (copy_to_user(argp, &ident, sizeof(ident)))
+			return -EFAULT;
+		break;
+
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, p);
+
+	case WDIOC_SETOPTIONS:
+	{
+		int options, retval = -EINVAL;
+
+		if (get_user(options, p))
+			return -EFAULT;
+
+		if (options & WDIOS_DISABLECARD) {
+			ibwdt_disable();
+			retval = 0;
+		}
+		if (options & WDIOS_ENABLECARD) {
+			ibwdt_ping();
+			retval = 0;
+		}
+		return retval;
+	}
+	case WDIOC_KEEPALIVE:
+		ibwdt_ping();
+		break;
+
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_margin, p))
+			return -EFAULT;
+		if (ibwdt_set_heartbeat(new_margin))
+			return -EINVAL;
+		ibwdt_ping();
+		fallthrough;
+
+	case WDIOC_GETTIMEOUT:
+		return put_user(timeout, p);
+
+	default:
+		return -ENOTTY;
+	}
+	return 0;
+}
+
+static int ibwdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &ibwdt_is_open))
+		return -EBUSY;
+	if (nowayout)
+		__module_get(THIS_MODULE);
+
+	/* Activate */
+	ibwdt_ping();
+	return stream_open(inode, file);
+}
+
+static int ibwdt_close(struct inode *inode, struct file *file)
+{
+	if (expect_close == 42) {
+		ibwdt_disable();
+	} else {
+		pr_crit("WDT device closed unexpectedly.  WDT will not stop!\n");
+		ibwdt_ping();
+	}
+	clear_bit(0, &ibwdt_is_open);
+	expect_close = 0;
+	return 0;
+}
+
+/*
+ *	Kernel Interfaces
+ */
+
+static const struct file_operations ibwdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= ibwdt_write,
+	.unlocked_ioctl	= ibwdt_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
+	.open		= ibwdt_open,
+	.release	= ibwdt_close,
+};
+
+static struct miscdevice ibwdt_miscdev = {
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops = &ibwdt_fops,
+};
+
+/*
+ *	Init & exit routines
+ */
+
+static int __init ibwdt_probe(struct platform_device *dev)
+{
+	int res;
+
+#if WDT_START != WDT_STOP
+	if (!request_region(WDT_STOP, 1, "IB700 WDT")) {
+		pr_err("STOP method I/O %X is not available\n", WDT_STOP);
+		res = -EIO;
+		goto out_nostopreg;
+	}
+#endif
+
+	if (!request_region(WDT_START, 1, "IB700 WDT")) {
+		pr_err("START method I/O %X is not available\n", WDT_START);
+		res = -EIO;
+		goto out_nostartreg;
+	}
+
+	/* Check that the heartbeat value is within it's range ;
+	 * if not reset to the default */
+	if (ibwdt_set_heartbeat(timeout)) {
+		ibwdt_set_heartbeat(WATCHDOG_TIMEOUT);
+		pr_info("timeout value must be 0<=x<=30, using %d\n", timeout);
+	}
+
+	res = misc_register(&ibwdt_miscdev);
+	if (res) {
+		pr_err("failed to register misc device\n");
+		goto out_nomisc;
+	}
+	return 0;
+
+out_nomisc:
+	release_region(WDT_START, 1);
+out_nostartreg:
+#if WDT_START != WDT_STOP
+	release_region(WDT_STOP, 1);
+#endif
+out_nostopreg:
+	return res;
+}
+
+static int ibwdt_remove(struct platform_device *dev)
+{
+	misc_deregister(&ibwdt_miscdev);
+	release_region(WDT_START, 1);
+#if WDT_START != WDT_STOP
+	release_region(WDT_STOP, 1);
+#endif
+	return 0;
+}
+
+static void ibwdt_shutdown(struct platform_device *dev)
+{
+	/* Turn the WDT off if we have a soft shutdown */
+	ibwdt_disable();
+}
+
+static struct platform_driver ibwdt_driver = {
+	.remove		= ibwdt_remove,
+	.shutdown	= ibwdt_shutdown,
+	.driver		= {
+		.name	= DRV_NAME,
+	},
+};
+
+static int __init ibwdt_init(void)
+{
+	int err;
+
+	pr_info("WDT driver for IB700 single board computer initialising\n");
+
+	ibwdt_platform_device = platform_device_register_simple(DRV_NAME,
+								-1, NULL, 0);
+	if (IS_ERR(ibwdt_platform_device))
+		return PTR_ERR(ibwdt_platform_device);
+
+	err = platform_driver_probe(&ibwdt_driver, ibwdt_probe);
+	if (err)
+		goto unreg_platform_device;
+
+	return 0;
+
+unreg_platform_device:
+	platform_device_unregister(ibwdt_platform_device);
+	return err;
+}
+
+static void __exit ibwdt_exit(void)
+{
+	platform_device_unregister(ibwdt_platform_device);
+	platform_driver_unregister(&ibwdt_driver);
+	pr_info("Watchdog Module Unloaded\n");
+}
+
+module_init(ibwdt_init);
+module_exit(ibwdt_exit);
+
+MODULE_AUTHOR("Charles Howes <chowes@vsol.net>");
+MODULE_DESCRIPTION("IB700 SBC watchdog driver");
+MODULE_LICENSE("GPL");
+
+/* end of ib700wdt.c */