Merge master.kernel.org:/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog

* master.kernel.org:/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog:
  [WATCHDOG] MIPS RM9000 on-chip watchdog device - patch 4
  [WATCHDOG] MIPS RM9000 on-chip watchdog device - patch 3
  [WATCHDOG] MIPS RM9000 on-chip watchdog device - patch 2
  [WATCHDOG] MIPS RM9000 on-chip watchdog device - patch 1
  [WATCHDOG] MIPS RM9000 on-chip watchdog device
  [WATCHDOG] Add iTCO vendor specific support
  [WATCHDOG] sc1200wdt.c pnp unregister fix.
  [WATCHDOG] config.h removal
  [WATCHDOG] NS pc87413-wdt Watchdog driver - fixes
  [WATCHDOG] NS pc87413-wdt Watchdog driver v1.1
  [WATCHDOG] NS pc87413-wdt Watchdog driver

1 files changed, 635 insertions, 0 deletions

diff --git a/drivers/char/watchdog/pc87413_wdt.c b/drivers/char/watchdog/pc87413_wdt.c
new file mode 100644
index 00000000000..1d447e32af4
--- /dev/null
+++ b/drivers/char/watchdog/pc87413_wdt.c
@@ -0,0 +1,635 @@
+/*
+ *      NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x
+ *
+ *      This code is based on wdt.c with original copyright.
+ *
+ *      (C) Copyright 2006 Sven Anders, <anders@anduras.de>
+ *                     and Marcus Junker, <junker@anduras.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.
+ *
+ *      Neither Sven Anders, Marcus Junker nor ANDURAS AG
+ *      admit liability nor provide warranty for any of this software.
+ *      This material is provided "AS-IS" and at no charge.
+ *
+ *      Release 1.1
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/notifier.h>
+#include <linux/fs.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+/* #define DEBUG 1 */
+
+#define DEFAULT_TIMEOUT     1            /* 1 minute */
+#define MAX_TIMEOUT         255
+
+#define VERSION             "1.1"
+#define MODNAME             "pc87413 WDT"
+#define PFX                 MODNAME ": "
+#define DPFX                MODNAME " - DEBUG: "
+
+#define WDT_INDEX_IO_PORT   (io+0)       /* I/O port base (index register) */
+#define WDT_DATA_IO_PORT    (WDT_INDEX_IO_PORT+1)
+#define SWC_LDN             0x04
+#define SIOCFG2             0x22         /* Serial IO register */
+#define WDCTL               0x10         /* Watchdog-Timer-Controll-Register */
+#define WDTO                0x11         /* Watchdog timeout register */
+#define WDCFG               0x12         /* Watchdog config register */
+
+static int io = 0x2E;		         /* Address used on Portwell Boards */
+
+static int timeout = DEFAULT_TIMEOUT;    /* timeout value */
+static unsigned long timer_enabled = 0;  /* is the timer enabled? */
+
+static char expect_close;                /* is the close expected? */
+
+static spinlock_t io_lock;               /* to guard the watchdog from io races */
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+
+/* -- Low level function ----------------------------------------*/
+
+/* Select pins for Watchdog output */
+
+static inline void pc87413_select_wdt_out (void)
+{
+	unsigned int cr_data = 0;
+
+	/* Step 1: Select multiple pin,pin55,as WDT output */
+
+	outb_p(SIOCFG2, WDT_INDEX_IO_PORT);
+
+	cr_data = inb (WDT_DATA_IO_PORT);
+
+	cr_data |= 0x80; /* Set Bit7 to 1*/
+	outb_p(SIOCFG2, WDT_INDEX_IO_PORT);
+
+	outb_p(cr_data, WDT_DATA_IO_PORT);
+
+#ifdef DEBUG
+	printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output:"
+	                      " Bit7 to 1: %d\n", cr_data);
+#endif
+}
+
+/* Enable SWC functions */
+
+static inline void pc87413_enable_swc(void)
+{
+	unsigned int cr_data=0;
+
+	/* Step 2: Enable SWC functions */
+
+	outb_p(0x07, WDT_INDEX_IO_PORT);        /* Point SWC_LDN (LDN=4) */
+	outb_p(SWC_LDN, WDT_DATA_IO_PORT);
+
+	outb_p(0x30, WDT_INDEX_IO_PORT);        /* Read Index 0x30 First */
+	cr_data = inb(WDT_DATA_IO_PORT);
+	cr_data |= 0x01;                        /* Set Bit0 to 1 */
+	outb_p(0x30, WDT_INDEX_IO_PORT);
+	outb_p(cr_data, WDT_DATA_IO_PORT);      /* Index0x30_bit0P1 */
+
+#ifdef DEBUG
+	printk(KERN_INFO DPFX "pc87413 - Enable SWC functions\n");
+#endif
+}
+
+/* Read SWC I/O base address */
+
+static inline unsigned int pc87413_get_swc_base(void)
+{
+	unsigned int  swc_base_addr = 0;
+	unsigned char addr_l, addr_h = 0;
+
+	/* Step 3: Read SWC I/O Base Address */
+
+	outb_p(0x60, WDT_INDEX_IO_PORT);        /* Read Index 0x60 */
+	addr_h = inb(WDT_DATA_IO_PORT);
+
+	outb_p(0x61, WDT_INDEX_IO_PORT);        /* Read Index 0x61 */
+
+	addr_l = inb(WDT_DATA_IO_PORT);
+
+	swc_base_addr = (addr_h << 8) + addr_l;
+
+#ifdef DEBUG
+	printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d,"
+	                      " res %d\n", addr_l, addr_h, swc_base_addr);
+#endif
+
+	return swc_base_addr;
+}
+
+/* Select Bank 3 of SWC */
+
+static inline void pc87413_swc_bank3(unsigned int swc_base_addr)
+{
+	/* Step 4: Select Bank3 of SWC */
+
+	outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f);
+
+#ifdef DEBUG
+	printk(KERN_INFO DPFX "Select Bank3 of SWC\n");
+#endif
+}
+
+/* Set watchdog timeout to x minutes */
+
+static inline void pc87413_programm_wdto(unsigned int swc_base_addr,
+					 char pc87413_time)
+{
+	/* Step 5: Programm WDTO, Twd. */
+
+	outb_p(pc87413_time, swc_base_addr + WDTO);
+
+#ifdef DEBUG
+	printk(KERN_INFO DPFX "Set WDTO to %d minutes\n", pc87413_time);
+#endif
+}
+
+/* Enable WDEN */
+
+static inline void pc87413_enable_wden(unsigned int swc_base_addr)
+{
+	/* Step 6: Enable WDEN */
+
+	outb_p(inb (swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL);
+
+#ifdef DEBUG
+	printk(KERN_INFO DPFX "Enable WDEN\n");
+#endif
+}
+
+/* Enable SW_WD_TREN */
+static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr)
+{
+	/* Enable SW_WD_TREN */
+
+	outb_p(inb (swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG);
+
+#ifdef DEBUG
+	printk(KERN_INFO DPFX "Enable SW_WD_TREN\n");
+#endif
+}
+
+/* Disable SW_WD_TREN */
+
+static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr)
+{
+	/* Disable SW_WD_TREN */
+
+	outb_p(inb (swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG);
+
+#ifdef DEBUG
+	printk(KERN_INFO DPFX "pc87413 - Disable SW_WD_TREN\n");
+#endif
+}
+
+/* Enable SW_WD_TRG */
+
+static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr)
+{
+	/* Enable SW_WD_TRG */
+
+	outb_p(inb (swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL);
+
+#ifdef DEBUG
+	printk(KERN_INFO DPFX "pc87413 - Enable SW_WD_TRG\n");
+#endif
+}
+
+/* Disable SW_WD_TRG */
+
+static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr)
+{
+	/* Disable SW_WD_TRG */
+
+	outb_p(inb (swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL);
+
+#ifdef DEBUG
+	printk(KERN_INFO DPFX "Disable SW_WD_TRG\n");
+#endif
+}
+
+/* -- Higher level functions ------------------------------------*/
+
+/* Enable the watchdog */
+
+static void pc87413_enable(void)
+{
+	unsigned int swc_base_addr;
+
+	spin_lock(&io_lock);
+
+	pc87413_select_wdt_out();
+	pc87413_enable_swc();
+	swc_base_addr = pc87413_get_swc_base();
+	pc87413_swc_bank3(swc_base_addr);
+	pc87413_programm_wdto(swc_base_addr, timeout);
+	pc87413_enable_wden(swc_base_addr);
+	pc87413_enable_sw_wd_tren(swc_base_addr);
+	pc87413_enable_sw_wd_trg(swc_base_addr);
+
+	spin_unlock(&io_lock);
+}
+
+/* Disable the watchdog */
+
+static void pc87413_disable(void)
+{
+	unsigned int swc_base_addr;
+
+	spin_lock(&io_lock);
+
+	pc87413_select_wdt_out();
+	pc87413_enable_swc();
+	swc_base_addr = pc87413_get_swc_base();
+	pc87413_swc_bank3(swc_base_addr);
+	pc87413_disable_sw_wd_tren(swc_base_addr);
+	pc87413_disable_sw_wd_trg(swc_base_addr);
+	pc87413_programm_wdto(swc_base_addr, 0);
+
+	spin_unlock(&io_lock);
+}
+
+/* Refresh the watchdog */
+
+static void pc87413_refresh(void)
+{
+	unsigned int swc_base_addr;
+
+	spin_lock(&io_lock);
+
+	pc87413_select_wdt_out();
+	pc87413_enable_swc();
+	swc_base_addr = pc87413_get_swc_base();
+	pc87413_swc_bank3(swc_base_addr);
+	pc87413_disable_sw_wd_tren(swc_base_addr);
+	pc87413_disable_sw_wd_trg(swc_base_addr);
+	pc87413_programm_wdto(swc_base_addr, timeout);
+	pc87413_enable_wden(swc_base_addr);
+	pc87413_enable_sw_wd_tren(swc_base_addr);
+	pc87413_enable_sw_wd_trg(swc_base_addr);
+
+	spin_unlock(&io_lock);
+}
+
+/* -- File operations -------------------------------------------*/
+
+/**
+ *	pc87413_open:
+ *	@inode: inode of device
+ *	@file: file handle to device
+ *
+ */
+
+static int pc87413_open(struct inode *inode, struct file *file)
+{
+	/* /dev/watchdog can only be opened once */
+
+	if (test_and_set_bit(0, &timer_enabled))
+		return -EBUSY;
+
+	if (nowayout)
+		__module_get(THIS_MODULE);
+
+	/* Reload and activate timer */
+	pc87413_refresh();
+
+	printk(KERN_INFO MODNAME "Watchdog enabled. Timeout set to"
+	                         " %d minute(s).\n", timeout);
+
+	return nonseekable_open(inode, file);
+}
+
+/**
+ *	pc87413_release:
+ *	@inode: inode to board
+ *	@file: file handle to board
+ *
+ *	The watchdog has a configurable API. There is a religious dispute
+ *	between people who want their watchdog to be able to shut down and
+ *	those who want to be sure if the watchdog manager dies the machine
+ *	reboots. In the former case we disable the counters, in the latter
+ *	case you have to open it again very soon.
+ */
+
+static int pc87413_release(struct inode *inode, struct file *file)
+{
+	/* Shut off the timer. */
+
+	if (expect_close == 42) {
+		pc87413_disable();
+		printk(KERN_INFO MODNAME "Watchdog disabled,"
+		                         " sleeping again...\n");
+	} else {
+		printk(KERN_CRIT MODNAME "Unexpected close, not stopping"
+		                         " watchdog!\n");
+		pc87413_refresh();
+	}
+
+	clear_bit(0, &timer_enabled);
+	expect_close = 0;
+
+	return 0;
+}
+
+/**
+ *	pc87413_status:
+ *
+ *      return, if the watchdog is enabled (timeout is set...)
+ */
+
+
+static int pc87413_status(void)
+{
+	  return 0; /* currently not supported */
+}
+
+/**
+ *	pc87413_write:
+ *	@file: file handle to the watchdog
+ *	@data: data buffer to write
+ *	@len: length in bytes
+ *	@ppos: pointer to the position to write. No seeks allowed
+ *
+ *	A write to a watchdog device is defined as a keepalive signal. Any
+ *	write of data will do, as we we don't define content meaning.
+ */
+
+static ssize_t pc87413_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;
+
+			/* reset expect flag */
+			expect_close = 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_close = 42;
+			}
+		}
+
+		/* someone wrote to us, we should reload the timer */
+		pc87413_refresh();
+	}
+	return len;
+}
+
+/**
+ *	pc87413_ioctl:
+ *	@inode: inode of the device
+ *	@file: file handle to the device
+ *	@cmd: watchdog command
+ *	@arg: argument pointer
+ *
+ *	The watchdog API defines a common set of functions for all watchdogs
+ *	according to their available features. We only actually usefully support
+ *	querying capabilities and current status.
+ */
+
+static int pc87413_ioctl(struct inode *inode, struct file *file,
+			 unsigned int cmd, unsigned long arg)
+{
+	int new_timeout;
+
+	union {
+		struct watchdog_info __user *ident;
+		int __user *i;
+	} uarg;
+
+	static struct watchdog_info ident = {
+		.options          = WDIOF_KEEPALIVEPING |
+		                    WDIOF_SETTIMEOUT |
+		                    WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity         = "PC87413(HF/F) watchdog"
+	};
+
+	uarg.i = (int __user *)arg;
+
+	switch(cmd) {
+		default:
+			return -ENOTTY;
+
+		case WDIOC_GETSUPPORT:
+			return copy_to_user(uarg.ident, &ident,
+				sizeof(ident)) ? -EFAULT : 0;
+
+		case WDIOC_GETSTATUS:
+			return put_user(pc87413_status(), uarg.i);
+
+		case WDIOC_GETBOOTSTATUS:
+			return put_user(0, uarg.i);
+
+		case WDIOC_KEEPALIVE:
+			pc87413_refresh();
+#ifdef DEBUG
+	                printk(KERN_INFO DPFX "keepalive\n");
+#endif
+			return 0;
+
+		case WDIOC_SETTIMEOUT:
+			if (get_user(new_timeout, uarg.i))
+				return -EFAULT;
+
+			// the API states this is given in secs
+			new_timeout /= 60;
+
+			if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
+				return -EINVAL;
+
+			timeout = new_timeout;
+			pc87413_refresh();
+
+			// fall through and return the new timeout...
+
+		case WDIOC_GETTIMEOUT:
+
+		        new_timeout = timeout * 60;
+
+			return put_user(new_timeout, uarg.i);
+
+		case WDIOC_SETOPTIONS:
+		{
+			int options, retval = -EINVAL;
+
+			if (get_user(options, uarg.i))
+				return -EFAULT;
+
+			if (options & WDIOS_DISABLECARD) {
+			        pc87413_disable();
+				retval = 0;
+			}
+
+			if (options & WDIOS_ENABLECARD) {
+				pc87413_enable();
+				retval = 0;
+			}
+
+			return retval;
+		}
+	}
+}
+
+/* -- Notifier funtions -----------------------------------------*/
+
+/**
+ *	notify_sys:
+ *	@this: our notifier block
+ *	@code: the event being reported
+ *	@unused: unused
+ *
+ *	Our notifier is called on system shutdowns. We want to turn the card
+ *	off at reboot otherwise the machine will reboot again during memory
+ *	test or worse yet during the following fsck. This would suck, in fact
+ *	trust me - if it happens it does suck.
+ */
+
+static int pc87413_notify_sys(struct notifier_block *this,
+			      unsigned long code,
+			      void *unused)
+{
+	if (code == SYS_DOWN || code == SYS_HALT)
+	{
+		/* Turn the card off */
+		pc87413_disable();
+	}
+	return NOTIFY_DONE;
+}
+
+/* -- Module's structures ---------------------------------------*/
+
+static struct file_operations pc87413_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= pc87413_write,
+	.ioctl		= pc87413_ioctl,
+	.open		= pc87413_open,
+	.release	= pc87413_release,
+};
+
+static struct notifier_block pc87413_notifier =
+{
+	.notifier_call  = pc87413_notify_sys,
+};
+
+static struct miscdevice pc87413_miscdev=
+{
+	.minor          = WATCHDOG_MINOR,
+	.name           = "watchdog",
+	.fops           = &pc87413_fops
+};
+
+/* -- Module init functions -------------------------------------*/
+
+/**
+ * 	pc87413_init: module's "constructor"
+ *
+ *	Set up the WDT watchdog board. All we have to do is grab the
+ *	resources we require and bitch if anyone beat us to them.
+ *	The open() function will actually kick the board off.
+ */
+
+static int __init pc87413_init(void)
+{
+	int ret;
+
+	spin_lock_init(&io_lock);
+
+	printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n", WDT_INDEX_IO_PORT);
+
+	/* request_region(io, 2, "pc87413"); */
+
+	ret = register_reboot_notifier(&pc87413_notifier);
+	if (ret != 0) {
+		printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+			ret);
+	}
+
+	ret = misc_register(&pc87413_miscdev);
+
+	if (ret != 0) {
+		printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+			WATCHDOG_MINOR, ret);
+		unregister_reboot_notifier(&pc87413_notifier);
+		return ret;
+	}
+
+	printk(KERN_INFO PFX "initialized. timeout=%d min \n", timeout);
+
+	pc87413_enable();
+
+	return 0;
+}
+
+/**
+ *	pc87413_exit: module's "destructor"
+ *
+ *	Unload the watchdog. You cannot do this with any file handles open.
+ *	If your watchdog is set to continue ticking on close and you unload
+ *	it, well it keeps ticking. We won't get the interrupt but the board
+ *	will not touch PC memory so all is fine. You just have to load a new
+ *	module in 60 seconds or reboot.
+ */
+
+static void __exit pc87413_exit(void)
+{
+	/* Stop the timer before we leave */
+	if (!nowayout)
+	{
+		pc87413_disable();
+		printk(KERN_INFO MODNAME "Watchdog disabled.\n");
+	}
+
+	misc_deregister(&pc87413_miscdev);
+	unregister_reboot_notifier(&pc87413_notifier);
+	/* release_region(io,2); */
+
+	printk(MODNAME " watchdog component driver removed.\n");
+}
+
+module_init(pc87413_init);
+module_exit(pc87413_exit);
+
+MODULE_AUTHOR("Sven Anders <anders@anduras.de>, Marcus Junker <junker@anduras.de>,");
+MODULE_DESCRIPTION("PC87413 WDT driver");
+MODULE_LICENSE("GPL");
+
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+
+module_param(io, int, 0);
+MODULE_PARM_DESC(io, MODNAME " I/O port (default: " __MODULE_STRING(io) ").");
+
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes (default=" __MODULE_STRING(timeout) ").");
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+