Initial import

1 files changed, 299 insertions, 0 deletions

diff --git a/drivers/watchdog/cpu5wdt.c b/drivers/watchdog/cpu5wdt.c
new file mode 100644
index 000000000..6d03e8e30
--- /dev/null
+++ b/drivers/watchdog/cpu5wdt.c
@@ -0,0 +1,299 @@
+/*
+ * sma cpu5 watchdog driver
+ *
+ * Copyright (C) 2003 Heiko Ronsdorf <hero@ihg.uni-duisburg.de>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#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/io.h>
+#include <linux/uaccess.h>
+#include <linux/watchdog.h>
+
+/* adjustable parameters */
+
+static int verbose;
+static int port = 0x91;
+static int ticks = 10000;
+static DEFINE_SPINLOCK(cpu5wdt_lock);
+
+#define PFX			"cpu5wdt: "
+
+#define CPU5WDT_EXTENT          0x0A
+
+#define CPU5WDT_STATUS_REG      0x00
+#define CPU5WDT_TIME_A_REG      0x02
+#define CPU5WDT_TIME_B_REG      0x03
+#define CPU5WDT_MODE_REG        0x04
+#define CPU5WDT_TRIGGER_REG     0x07
+#define CPU5WDT_ENABLE_REG      0x08
+#define CPU5WDT_RESET_REG       0x09
+
+#define CPU5WDT_INTERVAL	(HZ/10+1)
+
+/* some device data */
+
+static struct {
+	struct completion stop;
+	int running;
+	struct timer_list timer;
+	int queue;
+	int default_ticks;
+	unsigned long inuse;
+} cpu5wdt_device;
+
+/* generic helper functions */
+
+static void cpu5wdt_trigger(unsigned long unused)
+{
+	if (verbose > 2)
+		pr_debug("trigger at %i ticks\n", ticks);
+
+	if (cpu5wdt_device.running)
+		ticks--;
+
+	spin_lock(&cpu5wdt_lock);
+	/* keep watchdog alive */
+	outb(1, port + CPU5WDT_TRIGGER_REG);
+
+	/* requeue?? */
+	if (cpu5wdt_device.queue && ticks)
+		mod_timer(&cpu5wdt_device.timer, jiffies + CPU5WDT_INTERVAL);
+	else {
+		/* ticks doesn't matter anyway */
+		complete(&cpu5wdt_device.stop);
+	}
+	spin_unlock(&cpu5wdt_lock);
+
+}
+
+static void cpu5wdt_reset(void)
+{
+	ticks = cpu5wdt_device.default_ticks;
+
+	if (verbose)
+		pr_debug("reset (%i ticks)\n", (int) ticks);
+
+}
+
+static void cpu5wdt_start(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cpu5wdt_lock, flags);
+	if (!cpu5wdt_device.queue) {
+		cpu5wdt_device.queue = 1;
+		outb(0, port + CPU5WDT_TIME_A_REG);
+		outb(0, port + CPU5WDT_TIME_B_REG);
+		outb(1, port + CPU5WDT_MODE_REG);
+		outb(0, port + CPU5WDT_RESET_REG);
+		outb(0, port + CPU5WDT_ENABLE_REG);
+		mod_timer(&cpu5wdt_device.timer, jiffies + CPU5WDT_INTERVAL);
+	}
+	/* if process dies, counter is not decremented */
+	cpu5wdt_device.running++;
+	spin_unlock_irqrestore(&cpu5wdt_lock, flags);
+}
+
+static int cpu5wdt_stop(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cpu5wdt_lock, flags);
+	if (cpu5wdt_device.running)
+		cpu5wdt_device.running = 0;
+	ticks = cpu5wdt_device.default_ticks;
+	spin_unlock_irqrestore(&cpu5wdt_lock, flags);
+	if (verbose)
+		pr_crit("stop not possible\n");
+	return -EIO;
+}
+
+/* filesystem operations */
+
+static int cpu5wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &cpu5wdt_device.inuse))
+		return -EBUSY;
+	return nonseekable_open(inode, file);
+}
+
+static int cpu5wdt_release(struct inode *inode, struct file *file)
+{
+	clear_bit(0, &cpu5wdt_device.inuse);
+	return 0;
+}
+
+static long cpu5wdt_ioctl(struct file *file, unsigned int cmd,
+						unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+	unsigned int value;
+	static const struct watchdog_info ident = {
+		.options = WDIOF_CARDRESET,
+		.identity = "CPU5 WDT",
+	};
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		if (copy_to_user(argp, &ident, sizeof(ident)))
+			return -EFAULT;
+		break;
+	case WDIOC_GETSTATUS:
+		value = inb(port + CPU5WDT_STATUS_REG);
+		value = (value >> 2) & 1;
+		return put_user(value, p);
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, p);
+	case WDIOC_SETOPTIONS:
+		if (get_user(value, p))
+			return -EFAULT;
+		if (value & WDIOS_ENABLECARD)
+			cpu5wdt_start();
+		if (value & WDIOS_DISABLECARD)
+			cpu5wdt_stop();
+		break;
+	case WDIOC_KEEPALIVE:
+		cpu5wdt_reset();
+		break;
+	default:
+		return -ENOTTY;
+	}
+	return 0;
+}
+
+static ssize_t cpu5wdt_write(struct file *file, const char __user *buf,
+						size_t count, loff_t *ppos)
+{
+	if (!count)
+		return -EIO;
+	cpu5wdt_reset();
+	return count;
+}
+
+static const struct file_operations cpu5wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.unlocked_ioctl	= cpu5wdt_ioctl,
+	.open		= cpu5wdt_open,
+	.write		= cpu5wdt_write,
+	.release	= cpu5wdt_release,
+};
+
+static struct miscdevice cpu5wdt_misc = {
+	.minor	= WATCHDOG_MINOR,
+	.name	= "watchdog",
+	.fops	= &cpu5wdt_fops,
+};
+
+/* init/exit function */
+
+static int cpu5wdt_init(void)
+{
+	unsigned int val;
+	int err;
+
+	if (verbose)
+		pr_debug("port=0x%x, verbose=%i\n", port, verbose);
+
+	init_completion(&cpu5wdt_device.stop);
+	cpu5wdt_device.queue = 0;
+	setup_timer(&cpu5wdt_device.timer, cpu5wdt_trigger, 0);
+	cpu5wdt_device.default_ticks = ticks;
+
+	if (!request_region(port, CPU5WDT_EXTENT, PFX)) {
+		pr_err("request_region failed\n");
+		err = -EBUSY;
+		goto no_port;
+	}
+
+	/* watchdog reboot? */
+	val = inb(port + CPU5WDT_STATUS_REG);
+	val = (val >> 2) & 1;
+	if (!val)
+		pr_info("sorry, was my fault\n");
+
+	err = misc_register(&cpu5wdt_misc);
+	if (err < 0) {
+		pr_err("misc_register failed\n");
+		goto no_misc;
+	}
+
+
+	pr_info("init success\n");
+	return 0;
+
+no_misc:
+	release_region(port, CPU5WDT_EXTENT);
+no_port:
+	return err;
+}
+
+static int cpu5wdt_init_module(void)
+{
+	return cpu5wdt_init();
+}
+
+static void cpu5wdt_exit(void)
+{
+	if (cpu5wdt_device.queue) {
+		cpu5wdt_device.queue = 0;
+		wait_for_completion(&cpu5wdt_device.stop);
+		del_timer(&cpu5wdt_device.timer);
+	}
+
+	misc_deregister(&cpu5wdt_misc);
+
+	release_region(port, CPU5WDT_EXTENT);
+
+}
+
+static void cpu5wdt_exit_module(void)
+{
+	cpu5wdt_exit();
+}
+
+/* module entry points */
+
+module_init(cpu5wdt_init_module);
+module_exit(cpu5wdt_exit_module);
+
+MODULE_AUTHOR("Heiko Ronsdorf <hero@ihg.uni-duisburg.de>");
+MODULE_DESCRIPTION("sma cpu5 watchdog driver");
+MODULE_SUPPORTED_DEVICE("sma cpu5 watchdog");
+MODULE_LICENSE("GPL");
+
+module_param(port, int, 0);
+MODULE_PARM_DESC(port, "base address of watchdog card, default is 0x91");
+
+module_param(verbose, int, 0);
+MODULE_PARM_DESC(verbose, "be verbose, default is 0 (no)");
+
+module_param(ticks, int, 0);
+MODULE_PARM_DESC(ticks, "count down ticks, default is 10000");