From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 drivers/char/watchdog/pcwd_pci.c | 677 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 677 insertions(+)
 create mode 100644 drivers/char/watchdog/pcwd_pci.c

(limited to 'drivers/char/watchdog/pcwd_pci.c')

diff --git a/drivers/char/watchdog/pcwd_pci.c b/drivers/char/watchdog/pcwd_pci.c
new file mode 100644
index 00000000000..8ce06662732
--- /dev/null
+++ b/drivers/char/watchdog/pcwd_pci.c
@@ -0,0 +1,677 @@
+/*
+ *	Berkshire PCI-PC Watchdog Card Driver
+ *
+ *	(c) Copyright 2003 Wim Van Sebroeck <wim@iguana.be>.
+ *
+ *	Based on source code of the following authors:
+ *	  Ken Hollis <kenji@bitgate.com>,
+ *	  Lindsay Harris <lindsay@bluegum.com>,
+ *	  Alan Cox <alan@redhat.com>,
+ *	  Matt Domsch <Matt_Domsch@dell.com>,
+ *	  Rob Radez <rob@osinvestor.com>
+ *
+ *	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.
+ *
+ *	Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
+ *	provide warranty for any of this software. This material is
+ *	provided "AS-IS" and at no charge.
+ */
+
+/*
+ *	A bells and whistles driver is available from http://www.pcwd.de/
+ *	More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/
+ */
+
+/*
+ *	Includes, defines, variables, module parameters, ...
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/spinlock.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+/* Module and version information */
+#define WATCHDOG_VERSION "1.01"
+#define WATCHDOG_DATE "15 Mar 2005"
+#define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
+#define WATCHDOG_NAME "pcwd_pci"
+#define PFX WATCHDOG_NAME ": "
+#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n"
+
+/* Stuff for the PCI ID's  */
+#ifndef PCI_VENDOR_ID_QUICKLOGIC
+#define PCI_VENDOR_ID_QUICKLOGIC    0x11e3
+#endif
+
+#ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
+#define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
+#endif
+
+/*
+ * These are the defines that describe the control status bits for the
+ * PCI-PC Watchdog card.
+ */
+#define WD_PCI_WTRP             0x01	/* Watchdog Trip status */
+#define WD_PCI_HRBT             0x02	/* Watchdog Heartbeat */
+#define WD_PCI_TTRP             0x04	/* Temperature Trip status */
+
+/* according to documentation max. time to process a command for the pci
+ * watchdog card is 100 ms, so we give it 150 ms to do it's job */
+#define PCI_COMMAND_TIMEOUT	150
+
+/* Watchdog's internal commands */
+#define CMD_GET_STATUS			0x04
+#define CMD_GET_FIRMWARE_VERSION	0x08
+#define CMD_READ_WATCHDOG_TIMEOUT	0x18
+#define CMD_WRITE_WATCHDOG_TIMEOUT	0x19
+
+/* We can only use 1 card due to the /dev/watchdog restriction */
+static int cards_found;
+
+/* internal variables */
+static int temp_panic;
+static unsigned long is_active;
+static char expect_release;
+static struct {
+	int supports_temp;	/* Wether or not the card has a temperature device */
+	int boot_status;	/* The card's boot status */
+	unsigned long io_addr;	/* The cards I/O address */
+	spinlock_t io_lock;
+	struct pci_dev *pdev;
+} pcipcwd_private;
+
+/* module parameters */
+#define WATCHDOG_HEARTBEAT 2	/* 2 sec default heartbeat */
+static int heartbeat = WATCHDOG_HEARTBEAT;
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
+
+#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)");
+
+/*
+ *	Internal functions
+ */
+
+static int send_command(int cmd, int *msb, int *lsb)
+{
+	int got_response, count;
+
+	spin_lock(&pcipcwd_private.io_lock);
+	/* If a command requires data it should be written first.
+	 * Data for commands with 8 bits of data should be written to port 4.
+	 * Commands with 16 bits of data, should be written as LSB to port 4
+	 * and MSB to port 5.
+	 * After the required data has been written then write the command to
+	 * port 6. */
+	outb_p(*lsb, pcipcwd_private.io_addr + 4);
+	outb_p(*msb, pcipcwd_private.io_addr + 5);
+	outb_p(cmd, pcipcwd_private.io_addr + 6);
+
+	/* wait till the pci card processed the command, signaled by
+	 * the WRSP bit in port 2 and give it a max. timeout of
+	 * PCI_COMMAND_TIMEOUT to process */
+	got_response = inb_p(pcipcwd_private.io_addr + 2) & 0x40;
+	for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) {
+		mdelay(1);
+		got_response = inb_p(pcipcwd_private.io_addr + 2) & 0x40;
+	}
+
+	if (got_response) {
+		/* read back response */
+		*lsb = inb_p(pcipcwd_private.io_addr + 4);
+		*msb = inb_p(pcipcwd_private.io_addr + 5);
+
+		/* clear WRSP bit */
+		inb_p(pcipcwd_private.io_addr + 6);
+	}
+	spin_unlock(&pcipcwd_private.io_lock);
+
+	return got_response;
+}
+
+static int pcipcwd_start(void)
+{
+	int stat_reg;
+
+	spin_lock(&pcipcwd_private.io_lock);
+	outb_p(0x00, pcipcwd_private.io_addr + 3);
+	udelay(1000);
+
+	stat_reg = inb_p(pcipcwd_private.io_addr + 2);
+	spin_unlock(&pcipcwd_private.io_lock);
+
+	if (stat_reg & 0x10) {
+		printk(KERN_ERR PFX "Card timer not enabled\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int pcipcwd_stop(void)
+{
+	int stat_reg;
+
+	spin_lock(&pcipcwd_private.io_lock);
+	outb_p(0xA5, pcipcwd_private.io_addr + 3);
+	udelay(1000);
+
+	outb_p(0xA5, pcipcwd_private.io_addr + 3);
+	udelay(1000);
+
+	stat_reg = inb_p(pcipcwd_private.io_addr + 2);
+	spin_unlock(&pcipcwd_private.io_lock);
+
+	if (!(stat_reg & 0x10)) {
+		printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int pcipcwd_keepalive(void)
+{
+	/* Re-trigger watchdog by writing to port 0 */
+	outb_p(0x42, pcipcwd_private.io_addr);
+	return 0;
+}
+
+static int pcipcwd_set_heartbeat(int t)
+{
+	int t_msb = t / 256;
+	int t_lsb = t % 256;
+
+	if ((t < 0x0001) || (t > 0xFFFF))
+		return -EINVAL;
+
+	/* Write new heartbeat to watchdog */
+	send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
+
+	heartbeat = t;
+	return 0;
+}
+
+static int pcipcwd_get_status(int *status)
+{
+	int new_status;
+
+	*status=0;
+	new_status = inb_p(pcipcwd_private.io_addr + 1);
+	if (new_status & WD_PCI_WTRP)
+		*status |= WDIOF_CARDRESET;
+	if (new_status & WD_PCI_TTRP) {
+		*status |= WDIOF_OVERHEAT;
+		if (temp_panic)
+			panic(PFX "Temperature overheat trip!\n");
+	}
+
+	return 0;
+}
+
+static int pcipcwd_clear_status(void)
+{
+	outb_p(0x01, pcipcwd_private.io_addr + 1);
+	return 0;
+}
+
+static int pcipcwd_get_temperature(int *temperature)
+{
+	*temperature = 0;
+	if (!pcipcwd_private.supports_temp)
+		return -ENODEV;
+
+	/*
+	 * Convert celsius to fahrenheit, since this was
+	 * the decided 'standard' for this return value.
+	 */
+	*temperature = ((inb_p(pcipcwd_private.io_addr)) * 9 / 5) + 32;
+
+	return 0;
+}
+
+/*
+ *	/dev/watchdog handling
+ */
+
+static ssize_t pcipcwd_write(struct file *file, const char __user *data,
+			      size_t len, loff_t *ppos)
+{
+	/* See if we got the magic character 'V' and reload the timer */
+	if (len) {
+		if (!nowayout) {
+			size_t i;
+
+			/* note: just in case someone wrote the magic character
+			 * five months ago... */
+			expect_release = 0;
+
+			/* scan to see whether or not we got the magic character */
+			for (i = 0; i != len; i++) {
+				char c;
+				if(get_user(c, data+i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_release = 42;
+			}
+		}
+
+		/* someone wrote to us, we should reload the timer */
+		pcipcwd_keepalive();
+	}
+	return len;
+}
+
+static int pcipcwd_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_OVERHEAT |
+					WDIOF_CARDRESET |
+					WDIOF_KEEPALIVEPING |
+					WDIOF_SETTIMEOUT |
+					WDIOF_MAGICCLOSE,
+		.firmware_version =	1,
+		.identity =		WATCHDOG_DRIVER_NAME,
+	};
+
+	switch (cmd) {
+		case WDIOC_GETSUPPORT:
+			return copy_to_user(argp, &ident,
+				sizeof (ident)) ? -EFAULT : 0;
+
+		case WDIOC_GETSTATUS:
+		{
+			int status;
+
+			pcipcwd_get_status(&status);
+
+			return put_user(status, p);
+		}
+
+		case WDIOC_GETBOOTSTATUS:
+			return put_user(pcipcwd_private.boot_status, p);
+
+		case WDIOC_GETTEMP:
+		{
+			int temperature;
+
+			if (pcipcwd_get_temperature(&temperature))
+				return -EFAULT;
+
+			return put_user(temperature, p);
+		}
+
+		case WDIOC_KEEPALIVE:
+			pcipcwd_keepalive();
+			return 0;
+
+		case WDIOC_SETOPTIONS:
+		{
+			int new_options, retval = -EINVAL;
+
+			if (get_user (new_options, p))
+				return -EFAULT;
+
+			if (new_options & WDIOS_DISABLECARD) {
+				pcipcwd_stop();
+				retval = 0;
+			}
+
+			if (new_options & WDIOS_ENABLECARD) {
+				pcipcwd_start();
+				retval = 0;
+			}
+
+			if (new_options & WDIOS_TEMPPANIC) {
+				temp_panic = 1;
+				retval = 0;
+			}
+
+			return retval;
+		}
+
+		case WDIOC_SETTIMEOUT:
+		{
+			int new_heartbeat;
+
+			if (get_user(new_heartbeat, p))
+				return -EFAULT;
+
+			if (pcipcwd_set_heartbeat(new_heartbeat))
+			    return -EINVAL;
+
+			pcipcwd_keepalive();
+			/* Fall */
+		}
+
+		case WDIOC_GETTIMEOUT:
+			return put_user(heartbeat, p);
+
+		default:
+			return -ENOIOCTLCMD;
+	}
+}
+
+static int pcipcwd_open(struct inode *inode, struct file *file)
+{
+	/* /dev/watchdog can only be opened once */
+	if (test_and_set_bit(0, &is_active))
+		return -EBUSY;
+
+	/* Activate */
+	pcipcwd_start();
+	pcipcwd_keepalive();
+	return nonseekable_open(inode, file);
+}
+
+static int pcipcwd_release(struct inode *inode, struct file *file)
+{
+	/*
+	 *      Shut off the timer.
+	 */
+	if (expect_release == 42) {
+		pcipcwd_stop();
+	} else {
+		printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+		pcipcwd_keepalive();
+	}
+	expect_release = 0;
+	clear_bit(0, &is_active);
+	return 0;
+}
+
+/*
+ *	/dev/temperature handling
+ */
+
+static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
+				size_t len, loff_t *ppos)
+{
+	int temperature;
+
+	if (pcipcwd_get_temperature(&temperature))
+		return -EFAULT;
+
+	if (copy_to_user (data, &temperature, 1))
+		return -EFAULT;
+
+	return 1;
+}
+
+static int pcipcwd_temp_open(struct inode *inode, struct file *file)
+{
+	if (!pcipcwd_private.supports_temp)
+		return -ENODEV;
+
+	return nonseekable_open(inode, file);
+}
+
+static int pcipcwd_temp_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+/*
+ *	Notify system
+ */
+
+static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
+{
+	if (code==SYS_DOWN || code==SYS_HALT) {
+		/* Turn the WDT off */
+		pcipcwd_stop();
+	}
+
+	return NOTIFY_DONE;
+}
+
+/*
+ *	Kernel Interfaces
+ */
+
+static struct file_operations pcipcwd_fops = {
+	.owner =	THIS_MODULE,
+	.llseek =	no_llseek,
+	.write =	pcipcwd_write,
+	.ioctl =	pcipcwd_ioctl,
+	.open =		pcipcwd_open,
+	.release =	pcipcwd_release,
+};
+
+static struct miscdevice pcipcwd_miscdev = {
+	.minor =	WATCHDOG_MINOR,
+	.name =		"watchdog",
+	.fops =		&pcipcwd_fops,
+};
+
+static struct file_operations pcipcwd_temp_fops = {
+	.owner =	THIS_MODULE,
+	.llseek =	no_llseek,
+	.read =		pcipcwd_temp_read,
+	.open =		pcipcwd_temp_open,
+	.release =	pcipcwd_temp_release,
+};
+
+static struct miscdevice pcipcwd_temp_miscdev = {
+	.minor =	TEMP_MINOR,
+	.name =		"temperature",
+	.fops =		&pcipcwd_temp_fops,
+};
+
+static struct notifier_block pcipcwd_notifier = {
+	.notifier_call =	pcipcwd_notify_sys,
+};
+
+/*
+ *	Init & exit routines
+ */
+
+static inline void check_temperature_support(void)
+{
+	if (inb_p(pcipcwd_private.io_addr) != 0xF0)
+		pcipcwd_private.supports_temp = 1;
+}
+
+static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
+		const struct pci_device_id *ent)
+{
+	int ret = -EIO;
+	int got_fw_rev, fw_rev_major, fw_rev_minor;
+	char fw_ver_str[20];
+	char option_switches;
+
+	cards_found++;
+	if (cards_found == 1)
+		printk(KERN_INFO PFX DRIVER_VERSION);
+
+	if (cards_found > 1) {
+		printk(KERN_ERR PFX "This driver only supports 1 device\n");
+		return -ENODEV;
+	}
+
+	if (pci_enable_device(pdev)) {
+		printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
+		return -ENODEV;
+	}
+
+	if (pci_resource_start(pdev, 0) == 0x0000) {
+		printk(KERN_ERR PFX "No I/O-Address for card detected\n");
+		ret = -ENODEV;
+		goto err_out_disable_device;
+	}
+
+	pcipcwd_private.pdev = pdev;
+	pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
+
+	if (pci_request_regions(pdev, WATCHDOG_NAME)) {
+		printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
+			(int) pcipcwd_private.io_addr);
+		ret = -EIO;
+		goto err_out_disable_device;
+	}
+
+	/* get the boot_status */
+	pcipcwd_get_status(&pcipcwd_private.boot_status);
+
+	/* clear the "card caused reboot" flag */
+	pcipcwd_clear_status();
+
+	/* disable card */
+	pcipcwd_stop();
+
+	/* Check whether or not the card supports the temperature device */
+	check_temperature_support();
+
+	/* Get the Firmware Version */
+	got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
+	if (got_fw_rev) {
+		sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
+	} else {
+		sprintf(fw_ver_str, "<card no answer>");
+	}
+
+	/* Get switch settings */
+	option_switches = inb_p(pcipcwd_private.io_addr + 3);
+
+	printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
+		(int) pcipcwd_private.io_addr, fw_ver_str,
+		(pcipcwd_private.supports_temp ? "with" : "without"));
+
+	printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
+		option_switches,
+		((option_switches & 0x10) ? "ON" : "OFF"),
+		((option_switches & 0x08) ? "ON" : "OFF"));
+
+	if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
+		printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
+
+	if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
+		printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
+
+	if (pcipcwd_private.boot_status == 0)
+		printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
+
+	/* Check that the heartbeat value is within it's range ; if not reset to the default */
+	if (pcipcwd_set_heartbeat(heartbeat)) {
+		pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
+		printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
+			WATCHDOG_HEARTBEAT);
+	}
+
+	ret = register_reboot_notifier(&pcipcwd_notifier);
+	if (ret != 0) {
+		printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+			ret);
+		goto err_out_release_region;
+	}
+
+	if (pcipcwd_private.supports_temp) {
+		ret = misc_register(&pcipcwd_temp_miscdev);
+		if (ret != 0) {
+			printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+				TEMP_MINOR, ret);
+			goto err_out_unregister_reboot;
+		}
+	}
+
+	ret = misc_register(&pcipcwd_miscdev);
+	if (ret != 0) {
+		printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+			WATCHDOG_MINOR, ret);
+		goto err_out_misc_deregister;
+	}
+
+	printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
+		heartbeat, nowayout);
+
+	return 0;
+
+err_out_misc_deregister:
+	if (pcipcwd_private.supports_temp)
+		misc_deregister(&pcipcwd_temp_miscdev);
+err_out_unregister_reboot:
+	unregister_reboot_notifier(&pcipcwd_notifier);
+err_out_release_region:
+	pci_release_regions(pdev);
+err_out_disable_device:
+	pci_disable_device(pdev);
+	return ret;
+}
+
+static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
+{
+	/* Stop the timer before we leave */
+	if (!nowayout)
+		pcipcwd_stop();
+
+	/* Deregister */
+	misc_deregister(&pcipcwd_miscdev);
+	if (pcipcwd_private.supports_temp)
+		misc_deregister(&pcipcwd_temp_miscdev);
+	unregister_reboot_notifier(&pcipcwd_notifier);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	cards_found--;
+}
+
+static struct pci_device_id pcipcwd_pci_tbl[] = {
+	{ PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
+		PCI_ANY_ID, PCI_ANY_ID, },
+	{ 0 },			/* End of list */
+};
+MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
+
+static struct pci_driver pcipcwd_driver = {
+	.name		= WATCHDOG_NAME,
+	.id_table	= pcipcwd_pci_tbl,
+	.probe		= pcipcwd_card_init,
+	.remove		= __devexit_p(pcipcwd_card_exit),
+};
+
+static int __init pcipcwd_init_module(void)
+{
+	spin_lock_init (&pcipcwd_private.io_lock);
+
+	return pci_register_driver(&pcipcwd_driver);
+}
+
+static void __exit pcipcwd_cleanup_module(void)
+{
+	pci_unregister_driver(&pcipcwd_driver);
+}
+
+module_init(pcipcwd_init_module);
+module_exit(pcipcwd_cleanup_module);
+
+MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
+MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS_MISCDEV(TEMP_MINOR);
-- 
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