1 files changed, 421 insertions, 0 deletions
diff --git a/drivers/char/watchdog/alim7101_wdt.c b/drivers/char/watchdog/alim7101_wdt.c
new file mode 100644
index 000000000000..90c091d9e0f5
--- /dev/null
+++ b/drivers/char/watchdog/alim7101_wdt.c
@@ -0,0 +1,421 @@
+/*
+ *	ALi M7101 PMU Computer Watchdog Timer driver
+ *
+ *	Based on w83877f_wdt.c by Scott Jennings <linuxdrivers@oro.net>
+ *	and the Cobalt kernel WDT timer driver by Tim Hockin
+ *	                                      <thockin@cobaltnet.com>
+ *
+ *	(c)2002 Steve Hill <steve@navaho.co.uk>
+ *
+ *  This WDT driver is different from most other Linux WDT
+ *  drivers in that the driver will ping the watchdog by itself,
+ *  because this particular WDT has a very short timeout (1.6
+ *  seconds) and it would be insane to count on any userspace
+ *  daemon always getting scheduled within that time frame.
+ *
+ *  Additions:
+ *   Aug 23, 2004 - Added use_gpio module parameter for use on revision a1d PMUs
+ *                  found on very old cobalt hardware.
+ *                  -- Mike Waychison <michael.waychison@sun.com>
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/ioport.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/pci.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#define OUR_NAME "alim7101_wdt"
+#define PFX OUR_NAME ": "
+
+#define WDT_ENABLE 0x9C
+#define WDT_DISABLE 0x8C
+
+#define ALI_7101_WDT    0x92
+#define ALI_7101_GPIO   0x7D
+#define ALI_7101_GPIO_O 0x7E
+#define ALI_WDT_ARM     0x01
+
+/*
+ * We're going to use a 1 second timeout.
+ * If we reset the watchdog every ~250ms we should be safe.  */
+
+#define WDT_INTERVAL (HZ/4+1)
+
+/*
+ * We must not require too good response from the userspace daemon.
+ * Here we require the userspace daemon to send us a heartbeat
+ * char to /dev/watchdog every 30 seconds.
+ */
+
+#define WATCHDOG_TIMEOUT 30            /* 30 sec default timeout */
+static int timeout = WATCHDOG_TIMEOUT; /* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+
+static int use_gpio = 0; /* Use the pic (for a1d revision alim7101) */
+module_param(use_gpio, int, 0);
+MODULE_PARM_DESC(use_gpio, "Use the gpio watchdog.  (required by old cobalt boards)");
+
+static void wdt_timer_ping(unsigned long);
+static struct timer_list timer;
+static unsigned long next_heartbeat;
+static unsigned long wdt_is_open;
+static char wdt_expect_close;
+static struct pci_dev *alim7101_pmu;
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+/*
+ *	Whack the dog
+ */
+
+static void wdt_timer_ping(unsigned long data)
+{
+	/* If we got a heartbeat pulse within the WDT_US_INTERVAL
+	 * we agree to ping the WDT
+	 */
+	char	tmp;
+
+	if(time_before(jiffies, next_heartbeat))
+	{
+		/* Ping the WDT (this is actually a disarm/arm sequence) */
+		pci_read_config_byte(alim7101_pmu, 0x92, &tmp);
+		pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
+		pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM));
+		if (use_gpio) {
+			pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp);
+			pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp
+					| 0x20);
+			pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp
+					& ~0x20);
+		}
+	} else {
+		printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
+	}
+	/* Re-set the timer interval */
+	timer.expires = jiffies + WDT_INTERVAL;
+	add_timer(&timer);
+}
+
+/*
+ * Utility routines
+ */
+
+static void wdt_change(int writeval)
+{
+	char	tmp;
+
+	pci_read_config_byte(alim7101_pmu, ALI_7101_WDT, &tmp);
+	if (writeval == WDT_ENABLE) {
+		pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM));
+		if (use_gpio) {
+			pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp);
+			pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp & ~0x20);
+		}
+
+	} else {
+		pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
+		if (use_gpio) {
+			pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp);
+			pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp | 0x20);
+		}
+	}
+}
+
+static void wdt_startup(void)
+{
+	next_heartbeat = jiffies + (timeout * HZ);
+
+	/* We must enable before we kick off the timer in case the timer
+	   occurs as we ping it */
+
+	wdt_change(WDT_ENABLE);
+
+	/* Start the timer */
+	timer.expires = jiffies + WDT_INTERVAL;
+	add_timer(&timer);
+
+
+	printk(KERN_INFO PFX "Watchdog timer is now enabled.\n");
+}
+
+static void wdt_turnoff(void)
+{
+	/* Stop the timer */
+	del_timer_sync(&timer);
+	wdt_change(WDT_DISABLE);
+	printk(KERN_INFO PFX "Watchdog timer is now disabled...\n");
+}
+
+static void wdt_keepalive(void)
+{
+	/* user land ping */
+	next_heartbeat = jiffies + (timeout * HZ);
+}
+
+/*
+ * /dev/watchdog handling
+ */
+
+static ssize_t fop_write(struct file * file, const char __user * buf, size_t count, loff_t * ppos)
+{
+	/* See if we got the magic character 'V' and reload the timer */
+	if(count) {
+		if (!nowayout) {
+			size_t ofs;
+
+			/* note: just in case someone wrote the magic character
+			 * five months ago... */
+			wdt_expect_close = 0;
+
+			/* now scan */
+			for (ofs = 0; ofs != count; ofs++) {
+				char c;
+				if (get_user(c, buf+ofs))
+					return -EFAULT;
+				if (c == 'V')
+					wdt_expect_close = 42;
+			}
+		}
+		/* someone wrote to us, we should restart timer */
+		wdt_keepalive();
+	}
+	return count;
+}
+
+static int fop_open(struct inode * inode, struct file * file)
+{
+	/* Just in case we're already talking to someone... */
+	if(test_and_set_bit(0, &wdt_is_open))
+		return -EBUSY;
+	/* Good, fire up the show */
+	wdt_startup();
+	return nonseekable_open(inode, file);
+}
+
+static int fop_close(struct inode * inode, struct file * file)
+{
+	if(wdt_expect_close == 42)
+		wdt_turnoff();
+	else {
+		/* wim: shouldn't there be a: del_timer(&timer); */
+		printk(KERN_CRIT PFX "device file closed unexpectedly. Will not stop the WDT!\n");
+	}
+	clear_bit(0, &wdt_is_open);
+	wdt_expect_close = 0;
+	return 0;
+}
+
+static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+	static struct watchdog_info ident =
+	{
+		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "ALiM7101",
+	};
+
+	switch(cmd)
+	{
+		case WDIOC_GETSUPPORT:
+			return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
+		case WDIOC_GETSTATUS:
+		case WDIOC_GETBOOTSTATUS:
+			return put_user(0, p);
+		case WDIOC_KEEPALIVE:
+			wdt_keepalive();
+			return 0;
+		case WDIOC_SETOPTIONS:
+		{
+			int new_options, retval = -EINVAL;
+
+			if(get_user(new_options, p))
+				return -EFAULT;
+
+			if(new_options & WDIOS_DISABLECARD) {
+				wdt_turnoff();
+				retval = 0;
+			}
+
+			if(new_options & WDIOS_ENABLECARD) {
+				wdt_startup();
+				retval = 0;
+			}
+
+			return retval;
+		}
+		case WDIOC_SETTIMEOUT:
+		{
+			int new_timeout;
+
+			if(get_user(new_timeout, p))
+				return -EFAULT;
+
+			if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
+				return -EINVAL;
+
+			timeout = new_timeout;
+			wdt_keepalive();
+			/* Fall through */
+		}
+		case WDIOC_GETTIMEOUT:
+			return put_user(timeout, p);
+		default:
+			return -ENOIOCTLCMD;
+	}
+}
+
+static struct file_operations wdt_fops = {
+	.owner=		THIS_MODULE,
+	.llseek=	no_llseek,
+	.write=		fop_write,
+	.open=		fop_open,
+	.release=	fop_close,
+	.ioctl=		fop_ioctl,
+};
+
+static struct miscdevice wdt_miscdev = {
+	.minor=WATCHDOG_MINOR,
+	.name="watchdog",
+	.fops=&wdt_fops,
+};
+
+/*
+ *	Notifier for system down
+ */
+
+static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
+{
+	if (code==SYS_DOWN || code==SYS_HALT)
+		wdt_turnoff();
+
+	if (code==SYS_RESTART) {
+		/*
+		 * Cobalt devices have no way of rebooting themselves other than
+		 * getting the watchdog to pull reset, so we restart the watchdog on
+		 * reboot with no heartbeat
+		 */
+		wdt_change(WDT_ENABLE);
+		printk(KERN_INFO PFX "Watchdog timer is now enabled with no heartbeat - should reboot in ~1 second.\n");
+	}
+	return NOTIFY_DONE;
+}
+
+/*
+ *	The WDT needs to learn about soft shutdowns in order to
+ *	turn the timebomb registers off.
+ */
+
+static struct notifier_block wdt_notifier=
+{
+	.notifier_call = wdt_notify_sys,
+};
+
+static void __exit alim7101_wdt_unload(void)
+{
+	wdt_turnoff();
+	/* Deregister */
+	misc_deregister(&wdt_miscdev);
+	unregister_reboot_notifier(&wdt_notifier);
+}
+
+static int __init alim7101_wdt_init(void)
+{
+	int rc = -EBUSY;
+	struct pci_dev *ali1543_south;
+	char tmp;
+
+	printk(KERN_INFO PFX "Steve Hill <steve@navaho.co.uk>.\n");
+	alim7101_pmu = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101,NULL);
+	if (!alim7101_pmu) {
+		printk(KERN_INFO PFX "ALi M7101 PMU not present - WDT not set\n");
+		return -EBUSY;
+	}
+
+	/* Set the WDT in the PMU to 1 second */
+	pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, 0x02);
+
+	ali1543_south = pci_find_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
+	if (!ali1543_south) {
+		printk(KERN_INFO PFX "ALi 1543 South-Bridge not present - WDT not set\n");
+		return -EBUSY;
+	}
+	pci_read_config_byte(ali1543_south, 0x5e, &tmp);
+	if ((tmp & 0x1e) == 0x00) {
+		if (!use_gpio) {
+			printk(KERN_INFO PFX "Detected old alim7101 revision 'a1d'.  If this is a cobalt board, set the 'use_gpio' module parameter.\n");
+			return -EBUSY;
+		} 
+		nowayout = 1;
+	} else if ((tmp & 0x1e) != 0x12 && (tmp & 0x1e) != 0x00) {
+		printk(KERN_INFO PFX "ALi 1543 South-Bridge does not have the correct revision number (???1001?) - WDT not set\n");
+		return -EBUSY;
+	}
+
+	if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */
+	{
+		timeout = WATCHDOG_TIMEOUT;
+		printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n",
+			timeout);
+	}
+
+	init_timer(&timer);
+	timer.function = wdt_timer_ping;
+	timer.data = 1;
+
+	rc = misc_register(&wdt_miscdev);
+	if (rc) {
+		printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+			wdt_miscdev.minor, rc);
+		goto err_out;
+	}
+
+	rc = register_reboot_notifier(&wdt_notifier);
+	if (rc) {
+		printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+			rc);
+		goto err_out_miscdev;
+	}
+
+	if (nowayout) {
+		__module_get(THIS_MODULE);
+	}
+
+	printk(KERN_INFO PFX "WDT driver for ALi M7101 initialised. timeout=%d sec (nowayout=%d)\n",
+		timeout, nowayout);
+	return 0;
+
+err_out_miscdev:
+	misc_deregister(&wdt_miscdev);
+err_out:
+	return rc;
+}
+
+module_init(alim7101_wdt_init);
+module_exit(alim7101_wdt_unload);
+
+MODULE_AUTHOR("Steve Hill");
+MODULE_DESCRIPTION("ALi M7101 PMU Computer Watchdog Timer driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);