1 files changed, 304 insertions, 0 deletions

diff --git a/drivers/watchdog/cpu5wdt.c b/drivers/watchdog/cpu5wdt.c
new file mode 100644
index 000000000000..5941ca601a3a
--- /dev/null
+++ b/drivers/watchdog/cpu5wdt.c
@@ -0,0 +1,304 @@
+/*
+ * 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.
+ *
+ */
+
+#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/init.h>
+#include <linux/ioport.h>
+#include <linux/timer.h>
+#include <linux/completion.h>
+#include <linux/jiffies.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+#include <linux/watchdog.h>
+
+/* adjustable parameters */
+
+static int verbose = 0;
+static int port = 0x91;
+static int ticks = 10000;
+
+#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;
+        volatile int running;
+        struct timer_list timer;
+        volatile int queue;
+        int default_ticks;
+        unsigned long inuse;
+} cpu5wdt_device;
+
+/* generic helper functions */
+
+static void cpu5wdt_trigger(unsigned long unused)
+{
+        if ( verbose > 2 )
+                printk(KERN_DEBUG PFX "trigger at %i ticks\n", ticks);
+
+        if( cpu5wdt_device.running )
+                ticks--;
+
+        /* 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);
+        }
+
+}
+
+static void cpu5wdt_reset(void)
+{
+        ticks = cpu5wdt_device.default_ticks;
+
+        if ( verbose )
+                printk(KERN_DEBUG PFX "reset (%i ticks)\n", (int) ticks);
+
+}
+
+static void cpu5wdt_start(void)
+{
+        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++;
+}
+
+static int cpu5wdt_stop(void)
+{
+        if ( cpu5wdt_device.running )
+                cpu5wdt_device.running = 0;
+
+        ticks = cpu5wdt_device.default_ticks;
+
+        if ( verbose )
+                printk(KERN_CRIT PFX "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 int cpu5wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+        void __user *argp = (void __user *)arg;
+        unsigned int value;
+        static struct watchdog_info ident =
+        {
+                .options = WDIOF_CARDRESET,
+                .identity = "CPU5 WDT",
+        };
+
+        switch(cmd) {
+                case WDIOC_KEEPALIVE:
+                        cpu5wdt_reset();
+                        break;
+                case WDIOC_GETSTATUS:
+                        value = inb(port + CPU5WDT_STATUS_REG);
+                        value = (value >> 2) & 1;
+                        if ( copy_to_user(argp, &value, sizeof(int)) )
+                                return -EFAULT;
+                        break;
+                case WDIOC_GETBOOTSTATUS:
+                        if ( copy_to_user(argp, &value, sizeof(int)) )
+                                return -EFAULT;
+                        break;
+                case WDIOC_GETSUPPORT:
+                        if ( copy_to_user(argp, &ident, sizeof(ident)) )
+                                return -EFAULT;
+                        break;
+                case WDIOC_SETOPTIONS:
+                        if ( copy_from_user(&value, argp, sizeof(int)) )
+                                return -EFAULT;
+                        switch(value) {
+                                case WDIOS_ENABLECARD:
+                                        cpu5wdt_start();
+                                        break;
+                                case WDIOS_DISABLECARD:
+                                        return cpu5wdt_stop();
+                                default:
+                                        return -EINVAL;
+                        }
+                        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,
+        .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 __devinit cpu5wdt_init(void)
+{
+        unsigned int val;
+        int err;
+
+        if ( verbose )
+                printk(KERN_DEBUG PFX "port=0x%x, verbose=%i\n", port, verbose);
+
+        if ( !request_region(port, CPU5WDT_EXTENT, PFX) ) {
+                printk(KERN_ERR PFX "request_region failed\n");
+                err = -EBUSY;
+                goto no_port;
+        }
+
+        if ( (err = misc_register(&cpu5wdt_misc)) < 0 ) {
+                printk(KERN_ERR PFX "misc_register failed\n");
+                goto no_misc;
+        }
+
+        /* watchdog reboot? */
+        val = inb(port + CPU5WDT_STATUS_REG);
+        val = (val >> 2) & 1;
+        if ( !val )
+                printk(KERN_INFO PFX "sorry, was my fault\n");
+
+        init_completion(&cpu5wdt_device.stop);
+        cpu5wdt_device.queue = 0;
+
+        clear_bit(0, &cpu5wdt_device.inuse);
+
+        setup_timer(&cpu5wdt_device.timer, cpu5wdt_trigger, 0);
+
+        cpu5wdt_device.default_ticks = ticks;
+
+        printk(KERN_INFO PFX "init success\n");
+
+        return 0;
+
+no_misc:
+        release_region(port, CPU5WDT_EXTENT);
+no_port:
+        return err;
+}
+
+static int __devinit cpu5wdt_init_module(void)
+{
+        return cpu5wdt_init();
+}
+
+static void __devexit cpu5wdt_exit(void)
+{
+        if ( cpu5wdt_device.queue ) {
+                cpu5wdt_device.queue = 0;
+                wait_for_completion(&cpu5wdt_device.stop);
+        }
+
+        misc_deregister(&cpu5wdt_misc);
+
+        release_region(port, CPU5WDT_EXTENT);
+
+}
+
+static void __devexit 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_ALIAS_MISCDEV(WATCHDOG_MINOR);
+
+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");