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

drivers/char/watchdog/Kconfig

@@ -340,6 +340,14 @@ config ITCO_WDT
 	  To compile this driver as a module, choose M here: the
 	  module will be called iTCO_wdt.
 
+config ITCO_VENDOR_SUPPORT
+	bool "Intel TCO Timer/Watchdog Specific Vendor Support"
+	depends on ITCO_WDT
+	---help---
+	  Add vendor specific support to the intel TCO timer based watchdog
+	  devices. At this moment we only have additional support for some
+	  SuperMicro Inc. motherboards.
+
 config SC1200_WDT
 	tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog"
 	depends on WATCHDOG && X86
@@ -363,6 +371,20 @@ config SCx200_WDT
 
 	  If compiled as a module, it will be called scx200_wdt.
 
+config PC87413_WDT
+	tristate "NS PC87413 watchdog"
+	depends on WATCHDOG && X86
+	---help---
+	  This is the driver for the hardware watchdog on the PC87413 chipset
+	  This watchdog simply watches your kernel to make sure it doesn't
+	  freeze, and if it does, it reboots your computer after a certain
+	  amount of time.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called pc87413_wdt.
+
+	  Most people will say N.
+ 
 config 60XX_WDT
 	tristate "SBC-60XX Watchdog Timer"
 	depends on WATCHDOG && X86
@@ -553,6 +575,16 @@ config INDYDOG
 	  timer expired and no process has written to /dev/watchdog during
 	  that time.
 
+config WDT_RM9K_GPI
+	tristate "RM9000/GPI hardware watchdog"
+	depends on WATCHDOG && CPU_RM9000
+	help
+	  Watchdog implementation using the GPI hardware found on
+	  PMC-Sierra RM9xxx CPUs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called rm9k_wdt.
+
 # S390 Architecture
 
 config ZVM_WATCHDOG

drivers/char/watchdog/Makefile

@@ -47,9 +47,10 @@ obj-$(CONFIG_IBMASR) += ibmasr.o
 obj-$(CONFIG_WAFER_WDT) += wafer5823wdt.o
 obj-$(CONFIG_I6300ESB_WDT) += i6300esb.o
 obj-$(CONFIG_I8XX_TCO) += i8xx_tco.o
-obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o
+obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o iTCO_vendor_support.o
 obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
 obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o
+obj-$(CONFIG_PC87413_WDT) += pc87413_wdt.o
 obj-$(CONFIG_60XX_WDT) += sbc60xxwdt.o
 obj-$(CONFIG_SBC8360_WDT) += sbc8360.o
 obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o
@@ -72,6 +73,7 @@ obj-$(CONFIG_WATCHDOG_RTAS) += wdrtas.o
 
 # MIPS Architecture
 obj-$(CONFIG_INDYDOG) += indydog.o
+obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
 
 # S390 Architecture
 

drivers/char/watchdog/iTCO_vendor_support.c

+/*
+ *	intel TCO vendor specific watchdog driver support
+ *
+ *	(c) Copyright 2006 Wim Van Sebroeck <wim@iguana.be>.
+ *
+ *	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.
+ */
+
+/*
+ *	Includes, defines, variables, module parameters, ...
+ */
+
+/* Module and version information */
+#define DRV_NAME        "iTCO_vendor_support"
+#define DRV_VERSION     "1.01"
+#define DRV_RELDATE     "11-Nov-2006"
+#define PFX		DRV_NAME ": "
+
+/* Includes */
+#include <linux/module.h>		/* For module specific items */
+#include <linux/moduleparam.h>		/* For new moduleparam's */
+#include <linux/types.h>		/* For standard types (like size_t) */
+#include <linux/errno.h>		/* For the -ENODEV/... values */
+#include <linux/kernel.h>		/* For printk/panic/... */
+#include <linux/init.h>			/* For __init/__exit/... */
+#include <linux/ioport.h>		/* For io-port access */
+
+#include <asm/io.h>			/* For inb/outb/... */
+
+/* iTCO defines */
+#define	SMI_EN		acpibase + 0x30	/* SMI Control and Enable Register */
+#define	TCOBASE		acpibase + 0x60	/* TCO base address		*/
+#define	TCO1_STS	TCOBASE + 0x04	/* TCO1 Status Register		*/
+
+/* List of vendor support modes */
+#define SUPERMICRO_OLD_BOARD	1	/* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */
+#define SUPERMICRO_NEW_BOARD	2	/* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems */
+
+static int vendorsupport = 0;
+module_param(vendorsupport, int, 0);
+MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=0 (none), 1=SuperMicro Pent3, 2=SuperMicro Pent4+");
+
+/*
+ *	Vendor Specific Support
+ */
+
+/*
+ *	Vendor Support: 1
+ *	Board: Super Micro Computer Inc. 370SSE+-OEM1/P3TSSE
+ *	iTCO chipset: ICH2
+ *
+ *	Code contributed by: R. Seretny <lkpatches@paypc.com>
+ *	Documentation obtained by R. Seretny from SuperMicro Technical Support
+ *
+ *	To enable Watchdog function:
+ *	    BIOS setup -> Power -> TCO Logic SMI Enable -> Within5Minutes
+ *	    This setting enables SMI to clear the watchdog expired flag.
+ *	    If BIOS or CPU fail which may cause SMI hang, then system will
+ *	    reboot. When application starts to use watchdog function,
+ *	    application has to take over the control from SMI.
+ *
+ *	    For P3TSSE, J36 jumper needs to be removed to enable the Watchdog
+ *	    function.
+ *
+ *	    Note: The system will reboot when Expire Flag is set TWICE.
+ *	    So, if the watchdog timer is 20 seconds, then the maximum hang
+ *	    time is about 40 seconds, and the minimum hang time is about
+ *	    20.6 seconds.
+ */
+
+static void supermicro_old_pre_start(unsigned long acpibase)
+{
+	unsigned long val32;
+
+	val32 = inl(SMI_EN);
+	val32 &= 0xffffdfff;	/* Turn off SMI clearing watchdog */
+	outl(val32, SMI_EN);	/* Needed to activate watchdog */
+}
+
+static void supermicro_old_pre_stop(unsigned long acpibase)
+{
+	unsigned long val32;
+
+	val32 = inl(SMI_EN);
+	val32 &= 0x00002000;	/* Turn on SMI clearing watchdog */
+	outl(val32, SMI_EN);	/* Needed to deactivate watchdog */
+}
+
+static void supermicro_old_pre_keepalive(unsigned long acpibase)
+{
+	/* Reload TCO Timer (done in iTCO_wdt_keepalive) + */
+	/* Clear "Expire Flag" (Bit 3 of TC01_STS register) */
+	outb(0x08, TCO1_STS);
+}
+
+/*
+ *	Vendor Support: 2
+ *	Board: Super Micro Computer Inc. P4SBx, P4DPx
+ *	iTCO chipset: ICH4
+ *
+ *	Code contributed by: R. Seretny <lkpatches@paypc.com>
+ *	Documentation obtained by R. Seretny from SuperMicro Technical Support
+ *
+ *	To enable Watchdog function:
+ *	 1. BIOS
+ *	  For P4SBx:
+ *	  BIOS setup -> Advanced -> Integrated Peripherals -> Watch Dog Feature
+ *	  For P4DPx:
+ *	  BIOS setup -> Advanced -> I/O Device Configuration -> Watch Dog
+ *	 This setting enables or disables Watchdog function. When enabled, the
+ *	 default watchdog timer is set to be 5 minutes (about 4’35”). It is
+ *	 enough to load and run the OS. The application (service or driver) has
+ *	 to take over the control once OS is running up and before watchdog
+ *	 expires.
+ *
+ *	 2. JUMPER
+ *	  For P4SBx: JP39
+ *	  For P4DPx: JP37
+ *	  This jumper is used for safety.  Closed is enabled. This jumper
+ *	  prevents user enables watchdog in BIOS by accident.
+ *
+ *	 To enable Watch Dog function, both BIOS and JUMPER must be enabled.
+ *
+ *	The documentation lists motherboards P4SBx and P4DPx series as of
+ *	20-March-2002. However, this code works flawlessly with much newer
+ *	motherboards, such as my X6DHR-8G2 (SuperServer 6014H-82).
+ *
+ *	The original iTCO driver as written does not actually reset the
+ *	watchdog timer on these machines, as a result they reboot after five
+ *	minutes.
+ *
+ *	NOTE: You may leave the Watchdog function disabled in the SuperMicro
+ *	BIOS to avoid a "boot-race"... This driver will enable watchdog
+ *	functionality even if it's disabled in the BIOS once the /dev/watchdog
+ *	file is opened.
+ */
+
+/* I/O Port's */
+#define SM_REGINDEX	0x2e		/* SuperMicro ICH4+ Register Index */
+#define SM_DATAIO	0x2f		/* SuperMicro ICH4+ Register Data I/O */
+
+/* Control Register's */
+#define SM_CTLPAGESW	0x07		/* SuperMicro ICH4+ Control Page Switch */
+#define SM_CTLPAGE		0x08	/* SuperMicro ICH4+ Control Page Num */
+
+#define SM_WATCHENABLE	0x30		/* Watchdog enable: Bit 0: 0=off, 1=on */
+
+#define SM_WATCHPAGE	0x87		/* Watchdog unlock control page */
+
+#define SM_ENDWATCH	0xAA		/* Watchdog lock control page */
+
+#define SM_COUNTMODE	0xf5		/* Watchdog count mode select */
+					/* (Bit 3: 0 = seconds, 1 = minutes */
+
+#define SM_WATCHTIMER	0xf6		/* 8-bits, Watchdog timer counter (RW) */
+
+#define SM_RESETCONTROL	0xf7		/* Watchdog reset control */
+					/* Bit 6: timer is reset by kbd interrupt */
+					/* Bit 7: timer is reset by mouse interrupt */
+
+static void supermicro_new_unlock_watchdog(void)
+{
+	outb(SM_WATCHPAGE, SM_REGINDEX);	/* Write 0x87 to port 0x2e twice */
+	outb(SM_WATCHPAGE, SM_REGINDEX);
+
+	outb(SM_CTLPAGESW, SM_REGINDEX);	/* Switch to watchdog control page */
+	outb(SM_CTLPAGE, SM_DATAIO);
+}
+
+static void supermicro_new_lock_watchdog(void)
+{
+	outb(SM_ENDWATCH, SM_REGINDEX);
+}
+
+static void supermicro_new_pre_start(unsigned int heartbeat)
+{
+	unsigned int val;
+
+	supermicro_new_unlock_watchdog();
+
+	/* Watchdog timer setting needs to be in seconds*/
+	outb(SM_COUNTMODE, SM_REGINDEX);
+	val = inb(SM_DATAIO);
+	val &= 0xF7;
+	outb(val, SM_DATAIO);
+
+	/* Write heartbeat interval to WDOG */
+	outb (SM_WATCHTIMER, SM_REGINDEX);
+	outb((heartbeat & 255), SM_DATAIO);
+
+	/* Make sure keyboard/mouse interrupts don't interfere */
+	outb(SM_RESETCONTROL, SM_REGINDEX);
+	val = inb(SM_DATAIO);
+	val &= 0x3f;
+	outb(val, SM_DATAIO);
+
+	/* enable watchdog by setting bit 0 of Watchdog Enable to 1 */
+	outb(SM_WATCHENABLE, SM_REGINDEX);
+	val = inb(SM_DATAIO);
+	val |= 0x01;
+	outb(val, SM_DATAIO);
+
+	supermicro_new_lock_watchdog();
+}
+
+static void supermicro_new_pre_stop(void)
+{
+	unsigned int val;
+
+	supermicro_new_unlock_watchdog();
+
+	/* disable watchdog by setting bit 0 of Watchdog Enable to 0 */
+	outb(SM_WATCHENABLE, SM_REGINDEX);
+	val = inb(SM_DATAIO);
+	val &= 0xFE;
+	outb(val, SM_DATAIO);
+
+	supermicro_new_lock_watchdog();
+}
+
+static void supermicro_new_pre_set_heartbeat(unsigned int heartbeat)
+{
+	supermicro_new_unlock_watchdog();
+
+	/* reset watchdog timeout to heartveat value */
+	outb(SM_WATCHTIMER, SM_REGINDEX);
+	outb((heartbeat & 255), SM_DATAIO);
+
+	supermicro_new_lock_watchdog();
+}
+
+/*
+ *	Generic Support Functions
+ */
+
+void iTCO_vendor_pre_start(unsigned long acpibase,
+			   unsigned int heartbeat)
+{
+	if (vendorsupport == SUPERMICRO_OLD_BOARD)
+		supermicro_old_pre_start(acpibase);
+	else if (vendorsupport == SUPERMICRO_NEW_BOARD)
+		supermicro_new_pre_start(heartbeat);
+}
+EXPORT_SYMBOL(iTCO_vendor_pre_start);
+
+void iTCO_vendor_pre_stop(unsigned long acpibase)
+{
+	if (vendorsupport == SUPERMICRO_OLD_BOARD)
+		supermicro_old_pre_stop(acpibase);
+	else if (vendorsupport == SUPERMICRO_NEW_BOARD)
+		supermicro_new_pre_stop();
+}
+EXPORT_SYMBOL(iTCO_vendor_pre_stop);
+
+void iTCO_vendor_pre_keepalive(unsigned long acpibase, unsigned int heartbeat)
+{
+	if (vendorsupport == SUPERMICRO_OLD_BOARD)
+		supermicro_old_pre_keepalive(acpibase);
+	else if (vendorsupport == SUPERMICRO_NEW_BOARD)
+		supermicro_new_pre_set_heartbeat(heartbeat);
+}
+EXPORT_SYMBOL(iTCO_vendor_pre_keepalive);
+
+void iTCO_vendor_pre_set_heartbeat(unsigned int heartbeat)
+{
+	if (vendorsupport == SUPERMICRO_NEW_BOARD)
+		supermicro_new_pre_set_heartbeat(heartbeat);
+}
+EXPORT_SYMBOL(iTCO_vendor_pre_set_heartbeat);
+
+int iTCO_vendor_check_noreboot_on(void)
+{
+	switch(vendorsupport) {
+	case SUPERMICRO_OLD_BOARD:
+		return 0;
+	default:
+		return 1;
+	}
+}
+EXPORT_SYMBOL(iTCO_vendor_check_noreboot_on);
+
+static int __init iTCO_vendor_init_module(void)
+{
+	printk (KERN_INFO PFX "vendor-support=%d\n", vendorsupport);
+	return 0;
+}
+
+static void __exit iTCO_vendor_exit_module(void)
+{
+	printk (KERN_INFO PFX "Module Unloaded\n");
+}
+
+module_init(iTCO_vendor_init_module);
+module_exit(iTCO_vendor_exit_module);
+
+MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>, R. Seretny <lkpatches@paypc.com>");
+MODULE_DESCRIPTION("Intel TCO Vendor Specific WatchDog Timer Driver Support");
+MODULE_VERSION(DRV_VERSION);
+MODULE_LICENSE("GPL");
+

drivers/char/watchdog/iTCO_wdt.c

@@ -48,8 +48,8 @@
 
 /* Module and version information */
 #define DRV_NAME        "iTCO_wdt"
-#define DRV_VERSION     "1.00"
-#define DRV_RELDATE     "08-Oct-2006"
+#define DRV_VERSION     "1.01"
+#define DRV_RELDATE     "11-Nov-2006"
 #define PFX		DRV_NAME ": "
 
 /* Includes */
@@ -189,6 +189,21 @@ static int nowayout = WATCHDOG_NOWAYOUT;
 module_param(nowayout, int, 0);
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
 
+/* iTCO Vendor Specific Support hooks */
+#ifdef CONFIG_ITCO_VENDOR_SUPPORT
+extern void iTCO_vendor_pre_start(unsigned long, unsigned int);
+extern void iTCO_vendor_pre_stop(unsigned long);
+extern void iTCO_vendor_pre_keepalive(unsigned long, unsigned int);
+extern void iTCO_vendor_pre_set_heartbeat(unsigned int);
+extern int iTCO_vendor_check_noreboot_on(void);
+#else
+#define iTCO_vendor_pre_start(acpibase, heartbeat)	{}
+#define iTCO_vendor_pre_stop(acpibase)			{}
+#define iTCO_vendor_pre_keepalive(acpibase,heartbeat)	{}
+#define iTCO_vendor_pre_set_heartbeat(heartbeat)	{}
+#define iTCO_vendor_check_noreboot_on()			1	/* 1=check noreboot; 0=don't check */
+#endif
+
 /*
  * Some TCO specific functions
  */
@@ -249,6 +264,8 @@ static int iTCO_wdt_start(void)
 
 	spin_lock(&iTCO_wdt_private.io_lock);
 
+	iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat);
+
 	/* disable chipset's NO_REBOOT bit */
 	if (iTCO_wdt_unset_NO_REBOOT_bit()) {
 		printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
@@ -273,6 +290,8 @@ static int iTCO_wdt_stop(void)
 
 	spin_lock(&iTCO_wdt_private.io_lock);
 
+	iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE);
+
 	/* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
 	val = inw(TCO1_CNT);
 	val |= 0x0800;
@@ -293,6 +312,8 @@ static int iTCO_wdt_keepalive(void)
 {
 	spin_lock(&iTCO_wdt_private.io_lock);
 
+	iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat);
+
 	/* Reload the timer by writing to the TCO Timer Counter register */
 	if (iTCO_wdt_private.iTCO_version == 2) {
 		outw(0x01, TCO_RLD);
@@ -319,6 +340,8 @@ static int iTCO_wdt_set_heartbeat(int t)
 	    ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
 		return -EINVAL;
 
+	iTCO_vendor_pre_set_heartbeat(tmrval);
+
 	/* Write new heartbeat to watchdog */
 	if (iTCO_wdt_private.iTCO_version == 2) {
 		spin_lock(&iTCO_wdt_private.io_lock);
@@ -569,7 +592,7 @@ static int iTCO_wdt_init(struct pci_dev *pdev, const struct pci_device_id *ent,
 	}
 
 	/* Check chipset's NO_REBOOT bit */
-	if (iTCO_wdt_unset_NO_REBOOT_bit()) {
+	if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
 		printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
 		ret = -ENODEV;	/* Cannot reset NO_REBOOT bit */
 		goto out;

drivers/char/watchdog/pc87413_wdt.c

+/*
+ *      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)");
+

drivers/char/watchdog/rm9k_wdt.c

+/*
+ *  Watchdog implementation for GPI h/w found on PMC-Sierra RM9xxx
+ *  chips.
+ *
+ *  Copyright (C) 2004 by Basler Vision Technologies AG
+ *  Author: Thomas Koeller <thomas.koeller@baslerweb.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.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <linux/reboot.h>
+#include <linux/notifier.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <asm/io.h>
+#include <asm/atomic.h>
+#include <asm/processor.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/rm9k-ocd.h>
+
+#include <rm9k_wdt.h>
+
+
+#define CLOCK                  125000000
+#define MAX_TIMEOUT_SECONDS    32
+#define CPCCR                  0x0080
+#define CPGIG1SR               0x0044
+#define CPGIG1ER               0x0054
+
+
+/* Function prototypes */
+static irqreturn_t wdt_gpi_irqhdl(int, void *, struct pt_regs *);
+static void wdt_gpi_start(void);
+static void wdt_gpi_stop(void);
+static void wdt_gpi_set_timeout(unsigned int);
+static int wdt_gpi_open(struct inode *, struct file *);
+static int wdt_gpi_release(struct inode *, struct file *);
+static ssize_t wdt_gpi_write(struct file *, const char __user *, size_t, loff_t *);
+static long wdt_gpi_ioctl(struct file *, unsigned int, unsigned long);
+static int wdt_gpi_notify(struct notifier_block *, unsigned long, void *);
+static const struct resource *wdt_gpi_get_resource(struct platform_device *, const char *, unsigned int);
+static int __init wdt_gpi_probe(struct device *);
+static int __exit wdt_gpi_remove(struct device *);
+
+
+static const char wdt_gpi_name[] = "wdt_gpi";
+static atomic_t opencnt;
+static int expect_close;
+static int locked;
+
+
+/* These are set from device resources */
+static void __iomem * wd_regs;
+static unsigned int wd_irq, wd_ctr;
+
+
+/* Module arguments */
+static int timeout = MAX_TIMEOUT_SECONDS;
+module_param(timeout, int, 0444);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds");
+
+static unsigned long resetaddr = 0xbffdc200;
+module_param(resetaddr, ulong, 0444);
+MODULE_PARM_DESC(resetaddr, "Address to write to to force a reset");
+
+static unsigned long flagaddr = 0xbffdc104;
+module_param(flagaddr, ulong, 0444);
+MODULE_PARM_DESC(flagaddr, "Address to write to boot flags to");
+
+static int powercycle;
+module_param(powercycle, bool, 0444);
+MODULE_PARM_DESC(powercycle, "Cycle power if watchdog expires");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0444);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be disabled once started");
+
+
+/* Interrupt handler */
+static irqreturn_t wdt_gpi_irqhdl(int irq, void *ctxt, struct pt_regs *regs)
+{
+	if (!unlikely(__raw_readl(wd_regs + 0x0008) & 0x1))
+		return IRQ_NONE;
+	__raw_writel(0x1, wd_regs + 0x0008);
+
+
+	printk(KERN_CRIT "%s: watchdog expired - resetting system\n",
+		wdt_gpi_name);
+
+	*(volatile char *) flagaddr |= 0x01;
+	*(volatile char *) resetaddr = powercycle ? 0x01 : 0x2;
+	iob();
+	while (1)
+		cpu_relax();
+}
+
+
+/* Watchdog functions */
+static void wdt_gpi_start(void)
+{
+	u32 reg;
+
+	lock_titan_regs();
+	reg = titan_readl(CPGIG1ER);
+	titan_writel(reg | (0x100 << wd_ctr), CPGIG1ER);
+	iob();
+	unlock_titan_regs();
+}
+
+static void wdt_gpi_stop(void)
+{
+	u32 reg;
+
+	lock_titan_regs();
+	reg = titan_readl(CPCCR) & ~(0xf << (wd_ctr * 4));
+	titan_writel(reg, CPCCR);
+	reg = titan_readl(CPGIG1ER);
+	titan_writel(reg & ~(0x100 << wd_ctr), CPGIG1ER);
+	iob();
+	unlock_titan_regs();
+}
+
+static void wdt_gpi_set_timeout(unsigned int to)
+{
+	u32 reg;
+	const u32 wdval = (to * CLOCK) & ~0x0000000f;
+
+	lock_titan_regs();
+	reg = titan_readl(CPCCR) & ~(0xf << (wd_ctr * 4));
+	titan_writel(reg, CPCCR);
+	wmb();
+	__raw_writel(wdval, wd_regs + 0x0000);
+	wmb();
+	titan_writel(reg | (0x2 << (wd_ctr * 4)), CPCCR);
+	wmb();
+	titan_writel(reg | (0x5 << (wd_ctr * 4)), CPCCR);
+	iob();
+	unlock_titan_regs();
+}
+
+
+/* /dev/watchdog operations */
+static int wdt_gpi_open(struct inode *inode, struct file *file)
+{
+	int res;
+
+	if (unlikely(atomic_dec_if_positive(&opencnt) < 0))
+		return -EBUSY;
+
+	expect_close = 0;
+	if (locked) {
+		module_put(THIS_MODULE);
+		free_irq(wd_irq, &miscdev);
+		locked = 0;
+	}
+
+	res = request_irq(wd_irq, wdt_gpi_irqhdl, SA_SHIRQ | SA_INTERRUPT,
+			  wdt_gpi_name, &miscdev);
+	if (unlikely(res))
+		return res;
+
+	wdt_gpi_set_timeout(timeout);
+	wdt_gpi_start();
+
+	printk(KERN_INFO "%s: watchdog started, timeout = %u seconds\n",
+		wdt_gpi_name, timeout);
+	return nonseekable_open(inode, file);
+}
+
+static int wdt_gpi_release(struct inode *inode, struct file *file)
+{
+	if (nowayout) {
+		printk(KERN_INFO "%s: no way out - watchdog left running\n",
+			wdt_gpi_name);
+		__module_get(THIS_MODULE);
+		locked = 1;
+	} else {
+		if (expect_close) {
+			wdt_gpi_stop();
+			free_irq(wd_irq, &miscdev);
+			printk(KERN_INFO "%s: watchdog stopped\n", wdt_gpi_name);
+		} else {
+			printk(KERN_CRIT "%s: unexpected close() -"
+				" watchdog left running\n",
+				wdt_gpi_name);
+			wdt_gpi_set_timeout(timeout);
+			__module_get(THIS_MODULE);
+			locked = 1;
+		}
+	}
+
+	atomic_inc(&opencnt);
+	return 0;
+}
+
+static ssize_t
+wdt_gpi_write(struct file *f, const char __user *d, size_t s, loff_t *o)
+{
+	char val;
+
+	wdt_gpi_set_timeout(timeout);
+	expect_close = (s > 0) && !get_user(val, d) && (val == 'V');
+	return s ? 1 : 0;
+}
+
+static long
+wdt_gpi_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
+{
+	long res = -ENOTTY;
+	const long size = _IOC_SIZE(cmd);
+	int stat;
+	void __user *argp = (void __user *)arg;
+	static struct watchdog_info wdinfo = {
+		.identity               = "RM9xxx/GPI watchdog",
+		.firmware_version       = 0,
+		.options                = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING
+	};
+
+	if (unlikely(_IOC_TYPE(cmd) != WATCHDOG_IOCTL_BASE))
+		return -ENOTTY;
+
+	if ((_IOC_DIR(cmd) & _IOC_READ)
+	    && !access_ok(VERIFY_WRITE, arg, size))
+		return -EFAULT;
+
+	if ((_IOC_DIR(cmd) & _IOC_WRITE)
+	    && !access_ok(VERIFY_READ, arg, size))
+		return -EFAULT;
+
+	expect_close = 0;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		wdinfo.options = nowayout ?
+			WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING :
+			WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE;
+		res = __copy_to_user(argp, &wdinfo, size) ?  -EFAULT : size;
+		break;
+
+	case WDIOC_GETSTATUS:
+		break;
+
+	case WDIOC_GETBOOTSTATUS:
+		stat = (*(volatile char *) flagaddr & 0x01)
+			? WDIOF_CARDRESET : 0;
+		res = __copy_to_user(argp, &stat, size) ?
+			-EFAULT : size;
+		break;
+
+	case WDIOC_SETOPTIONS:
+		break;
+
+	case WDIOC_KEEPALIVE:
+		wdt_gpi_set_timeout(timeout);
+		res = size;
+		break;
+
+	case WDIOC_SETTIMEOUT:
+		{
+			int val;
+			if (unlikely(__copy_from_user(&val, argp, size))) {
+				res = -EFAULT;
+				break;
+			}
+
+			if (val > MAX_TIMEOUT_SECONDS)
+				val = MAX_TIMEOUT_SECONDS;
+			timeout = val;
+			wdt_gpi_set_timeout(val);
+			res = size;
+			printk(KERN_INFO "%s: timeout set to %u seconds\n",
+				wdt_gpi_name, timeout);
+		}
+		break;
+
+	case WDIOC_GETTIMEOUT:
+		res = __copy_to_user(argp, &timeout, size) ?
+			-EFAULT : size;
+		break;
+	}
+
+	return res;
+}
+
+
+/* Shutdown notifier */
+static int
+wdt_gpi_notify(struct notifier_block *this, unsigned long code, void *unused)
+{
+	if (code == SYS_DOWN || code == SYS_HALT)
+		wdt_gpi_stop();
+
+	return NOTIFY_DONE;
+}
+
+
+/* Kernel interfaces */
+static struct file_operations fops = {
+	.owner		= THIS_MODULE,
+	.open		= wdt_gpi_open,
+	.release	= wdt_gpi_release,
+	.write		= wdt_gpi_write,
+	.unlocked_ioctl	= wdt_gpi_ioctl,
+};
+
+static struct miscdevice miscdev = {
+	.minor		= WATCHDOG_MINOR,
+	.name		= wdt_gpi_name,
+	.fops		= &fops,
+};
+
+static struct notifier_block wdt_gpi_shutdown = {
+	.notifier_call	= wdt_gpi_notify,
+};
+
+
+/* Init & exit procedures */
+static const struct resource *
+wdt_gpi_get_resource(struct platform_device *pdv, const char *name,
+		      unsigned int type)
+{
+	char buf[80];
+	if (snprintf(buf, sizeof buf, "%s_0", name) >= sizeof buf)
+		return NULL;
+	return platform_get_resource_byname(pdv, type, buf);
+}
+
+/* No hotplugging on the platform bus - use __init */
+static int __init wdt_gpi_probe(struct device *dev)
+{
+	int res;
+	struct platform_device * const pdv = to_platform_device(dev);
+	const struct resource
+		* const rr = wdt_gpi_get_resource(pdv, WDT_RESOURCE_REGS,
+						  IORESOURCE_MEM),
+		* const ri = wdt_gpi_get_resource(pdv, WDT_RESOURCE_IRQ,
+						  IORESOURCE_IRQ),
+		* const rc = wdt_gpi_get_resource(pdv, WDT_RESOURCE_COUNTER,
+						  0);
+
+	if (unlikely(!rr || !ri || !rc))
+		return -ENXIO;
+
+	wd_regs = ioremap_nocache(rr->start, rr->end + 1 - rr->start);
+	if (unlikely(!wd_regs))
+		return -ENOMEM;
+	wd_irq = ri->start;
+	wd_ctr = rc->start;
+	res = misc_register(&miscdev);
+	if (res)
+		iounmap(wd_regs);
+	else
+		register_reboot_notifier(&wdt_gpi_shutdown);
+	return res;
+}
+
+static int __exit wdt_gpi_remove(struct device *dev)
+{
+	int res;
+
+	unregister_reboot_notifier(&wdt_gpi_shutdown);
+	res = misc_deregister(&miscdev);
+	iounmap(wd_regs);
+	wd_regs = NULL;
+	return res;
+}
+
+
+/* Device driver init & exit */
+static struct device_driver wdt_gpi_driver = {
+	.name		= (char *) wdt_gpi_name,
+	.bus		= &platform_bus_type,
+	.owner		= THIS_MODULE,
+	.probe		= wdt_gpi_probe,
+	.remove		= __exit_p(wdt_gpi_remove),
+	.shutdown	= NULL,
+	.suspend	= NULL,
+	.resume		= NULL,
+};
+
+static int __init wdt_gpi_init_module(void)
+{
+	atomic_set(&opencnt, 1);
+	if (timeout > MAX_TIMEOUT_SECONDS)
+		timeout = MAX_TIMEOUT_SECONDS;
+	return driver_register(&wdt_gpi_driver);
+}
+
+static void __exit wdt_gpi_cleanup_module(void)
+{
+	driver_unregister(&wdt_gpi_driver);
+}
+
+module_init(wdt_gpi_init_module);
+module_exit(wdt_gpi_cleanup_module);
+
+MODULE_AUTHOR("Thomas Koeller <thomas.koeller@baslerweb.com>");
+MODULE_DESCRIPTION("Basler eXcite watchdog driver for gpi devices");
+MODULE_VERSION("0.1");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+