1 files changed, 489 insertions, 0 deletions

diff --git a/drivers/watchdog/machzwd.c b/drivers/watchdog/machzwd.c
new file mode 100644
index 000000000000..6d35bb112a5f
--- /dev/null
+++ b/drivers/watchdog/machzwd.c
@@ -0,0 +1,489 @@
+/*
+ *  MachZ ZF-Logic Watchdog Timer driver for Linux
+ *
+ *
+ *  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.
+ *
+ *  The author does NOT admit liability nor provide warranty for
+ *  any of this software. This material is provided "AS-IS" in
+ *  the hope that it may be useful for others.
+ *
+ *  Author: Fernando Fuganti <fuganti@conectiva.com.br>
+ *
+ *  Based on sbc60xxwdt.c by Jakob Oestergaard
+ *
+ *
+ *  We have two timers (wd#1, wd#2) driven by a 32 KHz clock with the
+ *  following periods:
+ *      wd#1 - 2 seconds;
+ *      wd#2 - 7.2 ms;
+ *  After the expiration of wd#1, it can generate a NMI, SCI, SMI, or
+ *  a system RESET and it starts wd#2 that unconditionaly will RESET
+ *  the system when the counter reaches zero.
+ *
+ *  14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ *      Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/fs.h>
+#include <linux/ioport.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+/* ports */
+#define ZF_IOBASE       0x218
+#define INDEX           0x218
+#define DATA_B          0x219
+#define DATA_W          0x21A
+#define DATA_D          0x21A
+
+/* indexes */                   /* size */
+#define ZFL_VERSION     0x02    /* 16   */
+#define CONTROL         0x10    /* 16   */
+#define STATUS          0x12    /* 8    */
+#define COUNTER_1       0x0C    /* 16   */
+#define COUNTER_2       0x0E    /* 8    */
+#define PULSE_LEN       0x0F    /* 8    */
+
+/* controls */
+#define ENABLE_WD1      0x0001
+#define ENABLE_WD2      0x0002
+#define RESET_WD1       0x0010
+#define RESET_WD2       0x0020
+#define GEN_SCI         0x0100
+#define GEN_NMI         0x0200
+#define GEN_SMI         0x0400
+#define GEN_RESET       0x0800
+
+
+/* utilities */
+
+#define WD1     0
+#define WD2     1
+
+#define zf_writew(port, data)  { outb(port, INDEX); outw(data, DATA_W); }
+#define zf_writeb(port, data)  { outb(port, INDEX); outb(data, DATA_B); }
+#define zf_get_ZFL_version()   zf_readw(ZFL_VERSION)
+
+
+static unsigned short zf_readw(unsigned char port)
+{
+        outb(port, INDEX);
+        return inw(DATA_W);
+}
+
+
+MODULE_AUTHOR("Fernando Fuganti <fuganti@conectiva.com.br>");
+MODULE_DESCRIPTION("MachZ ZF-Logic Watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+#define PFX "machzwd"
+
+static struct watchdog_info zf_info = {
+        .options                = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+        .firmware_version       = 1,
+        .identity               = "ZF-Logic watchdog",
+};
+
+
+/*
+ * action refers to action taken when watchdog resets
+ * 0 = GEN_RESET
+ * 1 = GEN_SMI
+ * 2 = GEN_NMI
+ * 3 = GEN_SCI
+ * defaults to GEN_RESET (0)
+ */
+static int action = 0;
+module_param(action, int, 0);
+MODULE_PARM_DESC(action, "after watchdog resets, generate: 0 = RESET(*)  1 = SMI  2 = NMI  3 = SCI");
+
+static void zf_ping(unsigned long data);
+
+static int zf_action = GEN_RESET;
+static unsigned long zf_is_open;
+static char zf_expect_close;
+static spinlock_t zf_lock;
+static spinlock_t zf_port_lock;
+static DEFINE_TIMER(zf_timer, zf_ping, 0, 0);
+static unsigned long next_heartbeat = 0;
+
+
+/* timeout for user land heart beat (10 seconds) */
+#define ZF_USER_TIMEO (HZ*10)
+
+/* timeout for hardware watchdog (~500ms) */
+#define ZF_HW_TIMEO (HZ/2)
+
+/* number of ticks on WD#1 (driven by a 32KHz clock, 2s) */
+#define ZF_CTIMEOUT 0xffff
+
+#ifndef ZF_DEBUG
+#       define dprintk(format, args...)
+#else
+#       define dprintk(format, args...) printk(KERN_DEBUG PFX ":%s:%d: " format, __FUNCTION__, __LINE__ , ## args)
+#endif
+
+
+static inline void zf_set_status(unsigned char new)
+{
+        zf_writeb(STATUS, new);
+}
+
+
+/* CONTROL register functions */
+
+static inline unsigned short zf_get_control(void)
+{
+        return zf_readw(CONTROL);
+}
+
+static inline void zf_set_control(unsigned short new)
+{
+        zf_writew(CONTROL, new);
+}
+
+
+/* WD#? counter functions */
+/*
+ *      Just set counter value
+ */
+
+static inline void zf_set_timer(unsigned short new, unsigned char n)
+{
+        switch(n){
+                case WD1:
+                        zf_writew(COUNTER_1, new);
+                case WD2:
+                        zf_writeb(COUNTER_2, new > 0xff ? 0xff : new);
+                default:
+                        return;
+        }
+}
+
+/*
+ * stop hardware timer
+ */
+static void zf_timer_off(void)
+{
+        unsigned int ctrl_reg = 0;
+        unsigned long flags;
+
+        /* stop internal ping */
+        del_timer_sync(&zf_timer);
+
+        spin_lock_irqsave(&zf_port_lock, flags);
+        /* stop watchdog timer */
+        ctrl_reg = zf_get_control();
+        ctrl_reg |= (ENABLE_WD1|ENABLE_WD2);    /* disable wd1 and wd2 */
+        ctrl_reg &= ~(ENABLE_WD1|ENABLE_WD2);
+        zf_set_control(ctrl_reg);
+        spin_unlock_irqrestore(&zf_port_lock, flags);
+
+        printk(KERN_INFO PFX ": Watchdog timer is now disabled\n");
+}
+
+
+/*
+ * start hardware timer
+ */
+static void zf_timer_on(void)
+{
+        unsigned int ctrl_reg = 0;
+        unsigned long flags;
+
+        spin_lock_irqsave(&zf_port_lock, flags);
+
+        zf_writeb(PULSE_LEN, 0xff);
+
+        zf_set_timer(ZF_CTIMEOUT, WD1);
+
+        /* user land ping */
+        next_heartbeat = jiffies + ZF_USER_TIMEO;
+
+        /* start the timer for internal ping */
+        mod_timer(&zf_timer, jiffies + ZF_HW_TIMEO);
+
+        /* start watchdog timer */
+        ctrl_reg = zf_get_control();
+        ctrl_reg |= (ENABLE_WD1|zf_action);
+        zf_set_control(ctrl_reg);
+        spin_unlock_irqrestore(&zf_port_lock, flags);
+
+        printk(KERN_INFO PFX ": Watchdog timer is now enabled\n");
+}
+
+
+static void zf_ping(unsigned long data)
+{
+        unsigned int ctrl_reg = 0;
+        unsigned long flags;
+
+        zf_writeb(COUNTER_2, 0xff);
+
+        if(time_before(jiffies, next_heartbeat)){
+
+                dprintk("time_before: %ld\n", next_heartbeat - jiffies);
+
+                /*
+                 * reset event is activated by transition from 0 to 1 on
+                 * RESET_WD1 bit and we assume that it is already zero...
+                 */
+
+                spin_lock_irqsave(&zf_port_lock, flags);
+                ctrl_reg = zf_get_control();
+                ctrl_reg |= RESET_WD1;
+                zf_set_control(ctrl_reg);
+
+                /* ...and nothing changes until here */
+                ctrl_reg &= ~(RESET_WD1);
+                zf_set_control(ctrl_reg);
+                spin_unlock_irqrestore(&zf_port_lock, flags);
+
+                mod_timer(&zf_timer, jiffies + ZF_HW_TIMEO);
+        }else{
+                printk(KERN_CRIT PFX ": I will reset your machine\n");
+        }
+}
+
+static ssize_t zf_write(struct file *file, const char __user *buf, size_t count,
+                                                                loff_t *ppos)
+{
+        /* See if we got the magic character */
+        if(count){
+
+                /*
+                 * no need to check for close confirmation
+                 * no way to disable watchdog ;)
+                 */
+                if (!nowayout) {
+                        size_t ofs;
+
+                        /*
+                         * note: just in case someone wrote the magic character
+                         * five months ago...
+                         */
+                        zf_expect_close = 0;
+
+                        /* now scan */
+                        for (ofs = 0; ofs != count; ofs++){
+                                char c;
+                                if (get_user(c, buf + ofs))
+                                        return -EFAULT;
+                                if (c == 'V'){
+                                        zf_expect_close = 42;
+                                        dprintk("zf_expect_close = 42\n");
+                                }
+                        }
+                }
+
+                /*
+                 * Well, anyhow someone wrote to us,
+                 * we should return that favour
+                 */
+                next_heartbeat = jiffies + ZF_USER_TIMEO;
+                dprintk("user ping at %ld\n", jiffies);
+
+        }
+
+        return count;
+}
+
+static int zf_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+        unsigned long arg)
+{
+        void __user *argp = (void __user *)arg;
+        int __user *p = argp;
+        switch (cmd) {
+        case WDIOC_GETSUPPORT:
+                if (copy_to_user(argp, &zf_info, sizeof(zf_info)))
+                        return -EFAULT;
+                break;
+
+        case WDIOC_GETSTATUS:
+        case WDIOC_GETBOOTSTATUS:
+                return put_user(0, p);
+
+        case WDIOC_KEEPALIVE:
+                zf_ping(0);
+                break;
+
+        default:
+                return -ENOTTY;
+        }
+
+        return 0;
+}
+
+static int zf_open(struct inode *inode, struct file *file)
+{
+        spin_lock(&zf_lock);
+        if(test_and_set_bit(0, &zf_is_open)) {
+                spin_unlock(&zf_lock);
+                return -EBUSY;
+        }
+
+        if (nowayout)
+                __module_get(THIS_MODULE);
+
+        spin_unlock(&zf_lock);
+
+        zf_timer_on();
+
+        return nonseekable_open(inode, file);
+}
+
+static int zf_close(struct inode *inode, struct file *file)
+{
+        if(zf_expect_close == 42){
+                zf_timer_off();
+        } else {
+                del_timer(&zf_timer);
+                printk(KERN_ERR PFX ": device file closed unexpectedly. Will not stop the WDT!\n");
+        }
+
+        spin_lock(&zf_lock);
+        clear_bit(0, &zf_is_open);
+        spin_unlock(&zf_lock);
+
+        zf_expect_close = 0;
+
+        return 0;
+}
+
+/*
+ * Notifier for system down
+ */
+
+static int zf_notify_sys(struct notifier_block *this, unsigned long code,
+                                                                void *unused)
+{
+        if(code == SYS_DOWN || code == SYS_HALT){
+                zf_timer_off();
+        }
+
+        return NOTIFY_DONE;
+}
+
+
+
+
+static const struct file_operations zf_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .write          = zf_write,
+        .ioctl          = zf_ioctl,
+        .open           = zf_open,
+        .release        = zf_close,
+};
+
+static struct miscdevice zf_miscdev = {
+        .minor = WATCHDOG_MINOR,
+        .name = "watchdog",
+        .fops = &zf_fops,
+};
+ 
+
+/*
+ * The device needs to learn about soft shutdowns in order to
+ * turn the timebomb registers off.
+ */
+static struct notifier_block zf_notifier = {
+        .notifier_call = zf_notify_sys,
+};
+
+static void __init zf_show_action(int act)
+{
+        char *str[] = { "RESET", "SMI", "NMI", "SCI" };
+
+        printk(KERN_INFO PFX ": Watchdog using action = %s\n", str[act]);
+}
+
+static int __init zf_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO PFX ": MachZ ZF-Logic Watchdog driver initializing.\n");
+
+        ret = zf_get_ZFL_version();
+        if ((!ret) || (ret == 0xffff)) {
+                printk(KERN_WARNING PFX ": no ZF-Logic found\n");
+                return -ENODEV;
+        }
+
+        if((action <= 3) && (action >= 0)){
+                zf_action = zf_action>>action;
+        } else
+                action = 0;
+
+        zf_show_action(action);
+
+        spin_lock_init(&zf_lock);
+        spin_lock_init(&zf_port_lock);
+
+        if(!request_region(ZF_IOBASE, 3, "MachZ ZFL WDT")){
+                printk(KERN_ERR "cannot reserve I/O ports at %d\n",
+                                                        ZF_IOBASE);
+                ret = -EBUSY;
+                goto no_region;
+        }
+
+        ret = register_reboot_notifier(&zf_notifier);
+        if(ret){
+                printk(KERN_ERR "can't register reboot notifier (err=%d)\n",
+                                                                        ret);
+                goto no_reboot;
+        }
+
+        ret = misc_register(&zf_miscdev);
+        if (ret){
+                printk(KERN_ERR "can't misc_register on minor=%d\n",
+                                                        WATCHDOG_MINOR);
+                goto no_misc;
+        }
+
+        zf_set_status(0);
+        zf_set_control(0);
+
+        return 0;
+
+no_misc:
+        unregister_reboot_notifier(&zf_notifier);
+no_reboot:
+        release_region(ZF_IOBASE, 3);
+no_region:
+        return ret;
+}
+
+
+static void __exit zf_exit(void)
+{
+        zf_timer_off();
+
+        misc_deregister(&zf_miscdev);
+        unregister_reboot_notifier(&zf_notifier);
+        release_region(ZF_IOBASE, 3);
+}
+
+module_init(zf_init);
+module_exit(zf_exit);