Re: [PATCH] WDT Driver for Book-E [2/2] Device driver part.

Matt,

Do you think this really needs a config option?  Should it not be =20
sufficient that if you enable watchdog you get this functionality on =20
4xx/e500?

- kumar

On Mar 4, 2005, at 3:38 AM, Takeharu KATO wrote:

=A0=A0 =20

2005-03-04 13:21:32.000000000 +0900
 @@ -346,6 +346,13 @@ config 8xx_WDT
 =A0 =A0=A0=A0=A0=A0 tristate "MPC8xx Watchdog Timer"
 =A0 =A0=A0=A0=A0=A0 depends on WATCHDOG && 8xx

+config BOOKE_WDT
 +=A0=A0=A0 bool "Book E(PowerPC 4xx/e500) Watchdog Timer"
 +=A0=A0=A0 depends on WATCHDOG && ( 4xx || E500 )
 +=A0=A0=A0 ---help---
 +=A0=A0=A0=A0=A0 This is the driver for the watchdog timers on
 +=A0=A0=A0=A0=A0 PowerPC 4xx and PowerPC e500.
 +
 =A0 # MIPS Architecture

=A0 config INDYDOG
 --- linux-2.6.11/drivers/char/watchdog/Makefile 2005-03-04 =20
17:15:30.582965496 +0900
 +++ linux-2.6.11-booke-wdt/drivers/char/watchdog/Makefile=A0=A0=A0=A0=A0=

=A0 =20

2005-03-04 13:21:32.000000000 +0900
 @@ -39,3 +39,4 @@ obj-$(CONFIG_USBPCWATCHDOG) +=3D pcwd_usb.
 =A0 obj-$(CONFIG_IXP4XX_WATCHDOG) +=3D ixp4xx_wdt.o
 =A0 obj-$(CONFIG_IXP2000_WATCHDOG) +=3D ixp2000_wdt.o
=A0 obj-$(CONFIG_8xx_WDT) +=3D mpc8xx_wdt.o
 +obj-$(CONFIG_BOOKE_WDT) +=3D booke_wdt.o
 --- linux-2.6.11/drivers/char/watchdog/booke_wdt.c=A0=A0=A0=A0=A0 =

1970-01-01 =20

09:00:00.000000000 +0900
 +++ linux-2.6.11-booke-wdt/drivers/char/watchdog/booke_wdt.c=A0=A0=A0 =

=20

2005-03-04 16:38:58.000000000 +0900
 @@ -0,0 +1,664 @@
 +/*
 + *=A0=A0=A0 Copyright (c) 2005 Fujitsu Limited
 + *
 + *=A0=A0=A0 Module name: booke_wdt.c
 + *=A0=A0=A0 Author:=A0=A0=A0=A0=A0 Takeharu =

KATO[off-list ref]

+ *
 + *=A0=A0=A0 This program is free software; you can redistribute it =

and/or

 + *=A0=A0=A0 modify it under the terms of the GNU General Public =

License

+ *=A0=A0=A0 as published by the Free Software Foundation; either =

version 2

 + *=A0=A0=A0 of the License, or (at your option) any later version.
 + *
 + *=A0=A0=A0 Neither Takeharu KATO nor Fujitsu Ltd. admit liability =

nor =20

provide
 + *=A0=A0=A0 warranty for any of this software.
 + *
 + *=A0=A0=A0 Description:
 + *=A0=A0=A0=A0 Watchdog driver for PowerPC Book E (PowerPC 4xx =

series =20

processors and
 + *=A0=A0=A0=A0 PowerPC e500 series processors).
 + *=A0=A0=A0=A0 Derived from drivers/char/watchdog/wdt.c by Alan cox
 + *=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 and=A0 =

drivers/char/watchdog/ppc405_wdt.c by Armin =20

Kuster.
 + *=A0=A0=A0=A0 PPC4xx WDT operation is driverd from Appendix of
 + *=A0=A0=A0=A0 PowerPC Embedded Processors Application Note
 + *=A0=A0=A0=A0=A0 ``PowerPC 40x Watch Dog Timer'' published from =

IBM.

 + *=A0=A0=A0=A0 This driver is written according to ``PowerPC e500 =

Core =20

Complex
 + *=A0=A0=A0=A0 Reference Manual'' for e500 part.
 + */
 +#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/fs.h>
 +#include <linux/reboot.h>
+#include <linux/init.h>
 +#include <linux/capability.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <asm/reg.h>
 +#include <asm/uaccess.h>
+#include <asm/system.h>
+#include "booke_wdt.h"
+
 +/* micro seconds per one milli-second(used to calculatewatchdog
+ * counter to be set). */
 +#define US_PER_MS 1000
 +/*=A0 Calculate watchdog count=A0=A0 */
 +#define calculate_wdt_count(t) ((((unsigned long)(t))*HZ)/1000)
+
 +int wdt_enable=3D0;=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 /* WDT start =

on boot=A0 */

intrrupt counter to be =20

reloaded */
 +static volatile int wdt_heartbeat_count =3D 0;=A0 /* WDT intrrupt =20=

counter(compatible mode)*/
 +static unsigned long driver_state; /* Driver status (see: =20
booke_wdt.h) */
 +/*
 + *=A0 Identifier for this watchdog
 + */
 +static struct watchdog_info ident =3D {
 +=A0 .options=3DWDIOF_SETTIMEOUT|WDIOF_KEEPALIVEPING|WDIOF_MAGICCLOSE,
+=A0 .firmware_version =3D=A0=A0=A0 0, /*=A0 This is filled with PVR =

in =20

initialization. */
 +=A0 .identity =3D=A0=A0=A0=A0=A0=A0=A0 "Book E(PPC 4xx/e500) WDT",
 +};
 +
 +/*
 + *=A0 PowerPC Linux common exception handler
 + */
 +extern void _exception(int signr, struct pt_regs *regs, int code, =20=

unsigned long addr);
 +/*=A0 Panic notifier=A0 */
 +extern struct notifier_block *panic_notifier_list;
+/*
 + *=A0 External linkage functions
 + */
 +void booke_wdt_heartbeat(void);
+void booke_wdt_setup_options(char *cmd_line);
 +void booke_wdt_exception(struct pt_regs *regs);
+/*
 + * Internal linkage functions
 + */
 +static __inline__ void __booke_wdt_setup_val(int period,int reset);
 +static __inline__ void __booke_wdt_enable(void);
+static __inline__ void __booke_wdt_disable(void);
+static __inline__ int=A0 __booke_wdt_is_enabled(void);
+static __inline__ void __booke_wdt_clear_int_stat(void);
+static __inline__ void __booke_wdt_set_timeout(int t);
 +static __inline__ void booke_wdt_init_device(void);
+static __inline__ int=A0 booke_wdt_is_enabled(void);
+static __inline__ int=A0 booke_wdt_start(void);
+static __inline__ int=A0 booke_wdt_stop(void);
+static __inline__ int=A0 booke_wdt_ping(void);
+static __inline__ int=A0 booke_wdt_set_timeout(int t);
 +static __inline__ int=A0 booke_wdt_get_status(int *status);
 +static ssize_t booke_wdt_write(struct file *file, const char *buf, =20=

size_t count, loff_t *ppos);
 +static int booke_wdt_ioctl(struct inode *inode, struct file *file, =20=

unsigned int cmd,unsigned long arg);
 +static int booke_wdt_open(struct inode *inode, struct file *file);
+static int booke_wdt_release(struct inode *inode, struct file *file);
+static int booke_wdt_notify_sys(struct notifier_block *this, unsigned =

=20

long code,void *unused);
 +static int __init booke_wdt_init(void);
+static void __exit booke_wdt_exit(void);
+
 +/*
 + *=A0=A0=A0 Watchdog operations on PPC4xx/e500 MPU
 + */
 +
 +/**
 + *=A0=A0=A0=A0=A0 __booke_wdt_setup_val
+ *=A0=A0=A0=A0=A0 Enable Watchdog, sets up passed in values for =

TCR[WP],

 + *=A0=A0=A0=A0=A0 TCR[WRC]
 + *
 + *=A0=A0=A0 @period:=A0=A0=A0 Input Watchdog Period - TCR[WP]
 + *=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 0 =

=3D 217 clocks

+ *=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 1 =3D=

221 clocks

+ *=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 2 =3D=

225 clocks

+ *=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 3 =3D=

229 clocks

+ *=A0=A0=A0=A0=A0 @reset:=A0=A0=A0=A0=A0=A0=A0=A0 Watchdog reset =

control - TCR[WRC]

 + *=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 0 =

=3D No reset

 + *=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 1 =

=3D PPC Core reset only

 + *=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 2 =

=3D PPC Chip reset

 + *=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 3 =

=3D System reset

 + *=A0=A0=A0=A0 Note: The meaning of period number is differ PPC440GP =

from =20

PPC440GX.
 + */
 +#if defined(CONFIG_4xx)
+static __inline__ void
+__booke_wdt_setup_val(int period,int reset)
 +{
 +=A0 unsigned long val;
 +
 +=A0 /*=A0 Set up TCR=A0 */
 +=A0 =20
=

val=3D((period)<<WDT_TCR_WP_SHIFT|(reset)<<WDT_TCR_WRC_SHIFT)|mfspr(SPRN_=20=

TCR);
+=A0 /*=A0 Disable WDT=A0 */
 +=A0 val &=3D ~(WDT_TCR_WDT_ENABLE);
+
 +=A0 mtspr(SPRN_TCR,val);
+}
 +#else
 +/*=A0 e500=A0 */
 +static __inline__ void
+__booke_wdt_setup_val(int period,int reset)
 +{
 +=A0 unsigned long val;
 +=A0 /*=A0 Set up TCR=A0 */
 +
 +=A0 val=3D(((period)&(WDT_TCR_WP_BITMSK)) << WDT_TCR_WP_SHIFT|
+=A0=A0=A0=A0=A0=A0 ( ( (period) >> 2 )&(WDT_TCR_WPEXT_BITMSK)) << =20
WDT_TCR_WPEXT_SHIFT|
+=A0=A0=A0=A0=A0=A0 (reset)<<WDT_TCR_WRC_SHIFT)|mfspr(SPRN_TCR);
+=A0 /*=A0 Disable WDT=A0 */
 +=A0 val &=3D ~(WDT_TCR_WDT_ENABLE);
+
 +=A0 mtspr(SPRN_TCR,val);
+}
 +#endif=A0 /*=A0 CONFIG_E500 */
 +/**
 + *=A0=A0=A0=A0=A0 __booke_wdt_enable
+ *=A0=A0=A0=A0=A0 Enable Watchdog
 + */
 +static __inline__ void
+__booke_wdt_enable(void)
+{
 +=A0 mtspr(SPRN_TCR,(mfspr(SPRN_TCR)|WDT_TCR_WDT_ENABLE));
+}
 +/**
 + *=A0=A0=A0=A0=A0 __booke_wdt_disable
+ *=A0=A0=A0=A0=A0 Disable Watchdog
 + */
 +static __inline__ void
+__booke_wdt_disable(void)
+{
 +=A0 mtspr(SPRN_TCR,(mfspr(SPRN_TCR)&(~(WDT_TCR_WDT_ENABLE))));
+}
 +/**
 + *=A0=A0=A0=A0=A0 __booke_wdt_is_enabled
+ *=A0=A0=A0=A0=A0 Check whether Watchdog is enabled.
 + */
 +static __inline__ int
 +__booke_wdt_is_enabled(void)
+{
 +=A0 return (mfspr(SPRN_TCR) & WDT_TCR_WDT_ENABLE);
+}
 +/**
 + *=A0=A0=A0=A0=A0 __booke_wdt_clear_init_stat
+ *=A0=A0=A0=A0=A0 Clear interrupt status of watchdog to ping it.
 + */
 +static __inline__ void
+__booke_wdt_clear_int_stat(void)
+{
 +=A0 mtspr(SPRN_TSR, (TSR_ENW|TSR_WIS));
+}
 +/**
 + *=A0=A0=A0 __booke_wdt_set_timeout:
+ *=A0=A0=A0 @t:=A0=A0=A0 the new time out value that needs to be set.
 + *
 + *=A0=A0=A0 Set a new time out value for the watchdog device.
 + *
 + */
 +static __inline__ void
+__booke_wdt_set_timeout(int t)
 +{
 +=A0 wdt_count=3Dcalculate_wdt_count(t);
+=A0 return;
 +}
 +
 +/*
 + * Driver specific functions
 + */
 +
 +/**
 + *=A0=A0 booke_wdt_setup_options
+ *=A0=A0 @cmd_line : a pointer to kernel command line.
+ *
 + */
 +void
 +booke_wdt_setup_options(char *cmd_line)
 +{
 +/*
 + * Look for wdt=3D option on command line
 + */
 +=A0 if (strstr(cmd_line, "wdt=3D")) {
 +=A0=A0=A0 int valid_wdt =3D 0;
 +=A0=A0=A0 char *p, *q;
+
 +=A0=A0=A0 for (q =3D cmd_line; (p =3D strstr(q, "wdt=3D")) !=3D 0;) =

{

%s\n",

 +=A0=A0=A0=A0=A0=A0=A0 regs->nip, regs->msr, regs->trap, =

print_tainted());

=20

bother reloading
 + *=A0=A0=A0 the cascade counter.
 + */
 +static __inline__ int
 +booke_wdt_ping(void)
+{
 +=A0 /* Disable watchdog */
 +=A0 __booke_wdt_disable();
+=A0 /* Write a watchdog value */
 +=A0 __booke_wdt_clear_int_stat();
+=A0 /*=A0 Reset count=A0 */
 +=A0 wdt_heartbeat_count=3Dwdt_count;
+=A0 /* Enable watchdog */
 +=A0 __booke_wdt_enable();
+
 +=A0 return 0;
 +}
 +/**
 + *=A0=A0=A0 booke_wdt_set_timeout:
+ *=A0=A0=A0 @t:=A0=A0=A0=A0=A0=A0=A0 the new timeout value that needs =

to be set.

 + *
 + *=A0=A0=A0 Set a new time out value for the watchdog device.
 + *=A0=A0=A0=A0=A0 If the heartbeat value is incorrect we keep the =

old value

facility.

number.

here

 + *=A0=A0=A0 @count: count of bytes
 + *=A0=A0=A0 @ppos: pointer to the position to write. No seeks =

allowed

 + *
 + *=A0=A0=A0 A write to a watchdog device is defined as a keepalive =

signal. =20

Any
 + *=A0=A0=A0 write of data will do, as we we don't define content =

meaning =20

expept
 + *=A0=A0=A0=A0=A0 'V' character. It is performed as a sign to set =20=

stop-on-close mode.
 + */
 +
 +static ssize_t
 +booke_wdt_write(struct file *file, const char *buf, size_t count, =20=

loff_t *ppos)
 +{
 +=A0 size_t i;
 +
 +=A0=A0=A0 if (!nowayout) {
 +=A0=A0=A0=A0=A0 /* In case it was set long ago */
 +=A0=A0=A0=A0=A0 clear_bit(WDT_STATE_STOP_ON_CLOSE, &driver_state);
+
 +=A0=A0=A0=A0=A0 for (i =3D 0; i < count; i++) {
+=A0=A0=A0 char c;
 +
 +=A0=A0=A0 if (get_user(c, buf + i))
 +=A0=A0=A0=A0=A0 return -EFAULT;
 +
 +=A0=A0=A0 if (c =3D=3D 'V') {
 +=A0=A0=A0=A0=A0 set_bit(WDT_STATE_STOP_ON_CLOSE, &driver_state);
+=A0=A0=A0 }
 +=A0=A0=A0=A0=A0 }
 +=A0=A0=A0 }
 +=A0=A0=A0 booke_wdt_ping();
+
 +=A0 return count;
 +}
 +
 +/**
 + *=A0=A0=A0 booke_wdt_ioctl:
+ *=A0=A0=A0 @inode: inode of the device
 + *=A0=A0=A0 @file: file handle to the device
 + *=A0=A0=A0 @cmd: watchdog command
 + *=A0=A0=A0 @arg: argument pointer
 + *
 + */
 +static int
 +booke_wdt_ioctl(struct inode *inode, struct file *file, unsigned int =

=20

cmd,
 +=A0=A0=A0 unsigned long arg)
 +{
 +=A0=A0=A0 int new_timeout;
 +=A0=A0=A0 int status;
 +
 +=A0=A0=A0 if (!capable(CAP_SYS_ADMIN))
+=A0=A0=A0=A0=A0=A0=A0 return -EPERM;=A0 /*=A0 It may be too strict =

manner.=A0 */

&ident, =20

sizeof(struct watchdog_info)))
+=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 return -EFAULT;
 +=A0=A0=A0=A0=A0=A0=A0 else
 +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 break;
 +=A0=A0=A0 case WDIOC_GETSTATUS:
+=A0=A0=A0=A0=A0=A0=A0 booke_wdt_get_status(&status);
+=A0=A0=A0=A0=A0=A0=A0 return put_user(status,(int *)arg);
 +=A0=A0=A0 case WDIOC_KEEPALIVE:
+=A0=A0=A0=A0=A0=A0=A0 booke_wdt_ping();
+=A0=A0=A0=A0=A0=A0=A0 break;
 +=A0=A0=A0 case WDIOC_SETTIMEOUT:
+=A0=A0=A0=A0=A0=A0=A0 if (get_user(new_timeout, (int *)arg))
 +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 return -EFAULT;
 +=A0=A0=A0=A0=A0=A0=A0 if (booke_wdt_set_timeout(new_timeout))
+=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 return -EINVAL;
 +=A0=A0=A0=A0=A0=A0=A0 booke_wdt_ping();
+=A0=A0=A0=A0=A0=A0=A0 break;
 +=A0=A0=A0 case WDIOC_GETTIMEOUT:
+=A0=A0=A0=A0=A0=A0=A0 return put_user(wdt_period, (int *)arg);
 +=A0=A0=A0 case WDIOC_SETOPTIONS:
+=A0=A0=A0=A0=A0=A0=A0 if (get_user(status, (int *)arg))
 +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 return -EFAULT;
 +=A0=A0=A0=A0=A0=A0=A0 /*=A0 Return -EINVAL when the driver can not =

figure out

 +=A0=A0=A0=A0=A0=A0=A0=A0 *=A0 what it should do. Unknown cases are =

just ignored.

 +=A0=A0=A0=A0=A0=A0=A0=A0 */
 +=A0=A0=A0=A0=A0=A0=A0 if ( (status & =

(WDIOS_DISABLECARD|WDIOS_ENABLECARD))

+=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =3D=3D =

(WDIOS_DISABLECARD|WDIOS_ENABLECARD) )

disabled\n");

enabled\n");

is =20

single
+ *=A0=A0=A0 open and start the WDT timer.
 + */
 +static int
 +booke_wdt_open(struct inode *inode, struct file *file)
 +{
 +=A0=A0=A0 if (!capable(CAP_SYS_ADMIN))
+=A0=A0=A0=A0=A0=A0=A0 return -EPERM;
 +
 +=A0=A0=A0 if (test_and_set_bit(WDT_STATE_OPEN, &driver_state))
+=A0=A0=A0=A0=A0=A0=A0 return -EBUSY;
 +=A0=A0=A0 /*
 +=A0=A0=A0=A0 * Activate
 +=A0=A0=A0=A0 */
 +=A0=A0=A0 booke_wdt_start();
+=A0=A0=A0 wdt_enable=3D1;
+
 +=A0=A0=A0 if (nowayout)
 +=A0=A0=A0=A0=A0 set_bit(WDT_STATE_STOP_ON_CLOSE, &driver_state);
+
 +=A0=A0=A0 return 0;
 +}
 +
 +/**
 + *=A0=A0=A0 booke_wdt_release:
+ *=A0=A0=A0 @inode: inode to board
+ *=A0=A0=A0 @file: file handle to board
 + *
 + */
 +static int
 +booke_wdt_release(struct inode *inode, struct file *file)
 +{
 +=A0 if (test_bit(WDT_STATE_STOP_ON_CLOSE, &driver_state)) {
 +=A0=A0=A0=A0=A0 booke_wdt_note("WDT device is stopped.\n");
 +=A0=A0=A0 booke_wdt_stop();
+=A0=A0=A0 wdt_enable=3D0;
+=A0 } else {
 +=A0=A0=A0 if ( (booke_wdt_is_enabled()) && (!nowayout) ) {
 +=A0=A0=A0=A0=A0 booke_wdt_note("WDT device may be closed =

unexpectedly.=A0 WDT =20

will not stop!\n");
 +=A0=A0=A0=A0=A0 booke_wdt_ping();
+=A0=A0=A0 }
 +=A0 }
 +=A0 clear_bit(WDT_STATE_OPEN, &driver_state);
+
 +=A0 return 0;
 +}
 +/**
 + *=A0=A0=A0 notify_sys:
 + *=A0=A0=A0 @this: our notifier block
 + *=A0=A0=A0 @code: the event being reported
+ *=A0=A0=A0 @unused: unused
 + *=A0=A0=A0 Note: This function assume that the panic notifier is =

called =20

with CODE=3D0
 + *=A0=A0=A0=A0=A0=A0=A0=A0=A0 (see panic function in =

kernel/panic.c).

code,

you =20

unload
 + *=A0=A0=A0 it, well it keeps ticking.=A0 You just have to load a =

new

 + *=A0=A0=A0 module in 60 seconds or reboot.
 + *=A0=A0=A0=A0=A0 This behavior(more over the comments as above) is =

borrowed =20

from
 + *=A0=A0=A0=A0=A0 Alan cox's driver.
 + */
 +
 +static void __exit
 +booke_wdt_exit(void)
+{
 +=A0=A0=A0 misc_deregister(&booke_wdt_miscdev);
+=A0=A0=A0 unregister_reboot_notifier(&booke_wdt_notifier);
+=A0=A0=A0 =20
notifier_chain_unregister(&panic_notifier_list,&booke_wdt_notifier);
+}
 +
 +/**
 + *=A0=A0=A0=A0 booke_wdt_init:
+ *
 + *=A0=A0=A0 Set up the WDT relevant timer facility.
 + */
 +
 +static int __init
 +booke_wdt_init(void)
+{
 +=A0=A0=A0 int ret;
 +=A0=A0=A0 unsigned long flags;
 +
 +=A0=A0=A0 ret =3D register_reboot_notifier(&booke_wdt_notifier);
+=A0=A0=A0 if(ret) {
 +=A0=A0=A0=A0=A0 booke_wdt_err("Cannot register reboot notifier =

(err=3D%d)\n", =20

ret);
 +=A0=A0=A0=A0=A0 return ret;
+=A0=A0=A0 }
 +
 +=A0=A0=A0 /* Register panic notifier=A0 */
 +=A0=A0=A0 ret =3D =20
notifier_chain_register(&panic_notifier_list,&booke_wdt_notifier);
+=A0=A0=A0 if(ret) {
 +=A0=A0=A0=A0=A0 booke_wdt_err("Cannot register panic notifier =

(err=3D%d)\n", =20

ret);
 +=A0=A0=A0=A0=A0 unregister_reboot_notifier(&booke_wdt_notifier);
+=A0=A0=A0=A0=A0 return ret;
+=A0=A0=A0 }
 +
 +=A0=A0=A0 ret =3D 0;
 +=A0=A0=A0 booke_wdt_init_device();
+=A0=A0=A0 /* Check that the heartbeat value is within it's range ; if =

not =20

reset to the default */
 +=A0=A0=A0 if (booke_wdt_set_timeout(wdt_period)) {
 +=A0=A0=A0=A0=A0 if (wdt_period)
 +=A0=A0=A0=A0=A0=A0=A0 booke_wdt_info("The heartbeat value must be %d =

< wdt_period =20

< %d, using
%d\n",WDT_HEARTBEAT_MIN,WDT_HEARTBEAT_MAX,WDT_TIMO);
+=A0=A0=A0=A0=A0 booke_wdt_set_timeout(WDT_TIMO);
+=A0=A0=A0 }
 +
 +=A0=A0=A0 local_irq_save(flags); /* Prevent timer interrupt */
 +=A0=A0=A0 ppc_md.heartbeat_count =3D 0;
 +=A0=A0=A0 ppc_md.heartbeat=3Dbooke_wdt_heartbeat;
+=A0=A0=A0 local_irq_restore(flags);
+
 +=A0=A0=A0 booke_wdt_info("Book E(PPC 4xx/e500) Watchdog Driver. =

period=3D%d =20

ms (nowayout=3D%d)\n",wdt_period,
 nowayout);
 +
 +=A0=A0=A0 ret =3D misc_register(&booke_wdt_miscdev);
+=A0=A0=A0 if (ret) {
 +=A0=A0=A0=A0=A0 booke_wdt_err("Cannot register miscdev on minor=3D%d =

(err=3D%d)\n",

1970-01-01 =20

09:00:00.000000000 +0900
 +++ linux-2.6.11-booke-wdt/drivers/char/watchdog/booke_wdt.h=A0=A0=A0 =

=20

2005-03-04 16:38:58.000000000 +0900
 @@ -0,0 +1,125 @@
 +/*
 + *
 + *=A0=A0=A0 Copyright (c) 2004 Fujitsu Limited
 + *
 + *=A0=A0=A0 Module name: booke_wdt.h
 + *=A0=A0=A0 Author:=A0=A0=A0=A0=A0 Takeharu =

KATO[off-list ref]

+ *=A0=A0=A0 Description:
 + *=A0=A0=A0=A0=A0 Header file for PowerPC Book E(PPC 4xx/e500) =

watchdog driver.

 + *
 + *=A0=A0=A0 This program is free software; you can redistribute it =

and/or

 + *=A0=A0=A0 modify it under the terms of the GNU General Public =

License

+ *=A0=A0=A0 as published by the Free Software Foundation; either =

version 2

 + *=A0=A0=A0 of the License, or (at your option) any later version.
 + *
 + *=A0=A0=A0 Neither Takeharu KATO nor Fujitsu Ltd. admit liability =

nor =20

provide
 + *=A0=A0=A0 warranty for any of this software.
 + *
 + */
 +#ifndef _DRIVERS_CHAR_WATCHDOG_BOOKE_WDT_H
+#define _DRIVERS_CHAR_WATCHDOG_BOOKE_WDT_H
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/ptrace.h>
+#include <linux/watchdog.h>
+
 +/*
 + *=A0 Driver state flags(bit position)
 + */
 +#define WDT_STATE_OPEN=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=

=A0 0=A0=A0 /* driver is opend=A0 */

 +#define WDT_STATE_STOP_ON_CLOSE=A0=A0=A0=A0=A0=A0=A0=A0 1=A0=A0 /* =

Stop with close is =20

expected */
 +/*
 + * Configurations
+ */
 +#define WDT_TIMO=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 60000=A0=A0=A0 /* =

Default timeout =3D 60000 =20

ms(1min) */
 +#define WDT_HEARTBEAT_MIN=A0 100=A0=A0=A0=A0=A0=A0=A0=A0=A0 /* =

Minimum timeout =3D 100 ms =20

*/
 +#define WDT_HEARTBEAT_MAX=A0 600000=A0=A0=A0=A0=A0=A0 /* Maximum =

timeout =3D =20

600000ms(1hour) */
 +#ifdef __KERNEL__
 +//#define BOOKE_WDT_DEBUG=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=

=A0=A0=A0=A0=A0 /*=A0 Debug switch */

(bit[0..1])=A0=A0 */

 +#define WDT_TCR_WRC_BIT=A0=A0=A0 3=A0=A0 /*=A0 WRC bit in TCR =

(bit[2..3])=A0=A0 */

 +#define WDT_TCR_WIE_BIT=A0=A0=A0 4=A0=A0 /*=A0 WIE bit in TCR =

(bit[4])=A0=A0=A0=A0=A0 */

booke_wdt.c.

WDT_WP3

 +
 +/*
 + *=A0 IOCTL commands for comaptiblity for old driver
 + */
 +#define WDIOC_GETPERIOD=A0=A0=A0=A0=A0=A0=A0=A0 WDIOC_GETTIMEOUT
+#define WDIOC_SETPERIOD=A0=A0=A0=A0=A0=A0=A0=A0 WDIOC_SETTIMEOUT
+
 +/*
 + *=A0 output messages
 + */
 +#define __BOOKE_WDT_MSG "BookE-WDT : "
 +#define booke_mkmsg(str) __BOOKE_WDT_MSG str
 +#define booke_wdt_info(fmt,arg...) \
 +=A0=A0=A0 printk(KERN_INFO __BOOKE_WDT_MSG fmt,##arg)
 +#define booke_wdt_note(fmt,arg...) \
 +=A0=A0=A0 printk(KERN_NOTICE __BOOKE_WDT_MSG fmt,##arg)
 +#define booke_wdt_err(fmt,arg...) \
 +=A0=A0=A0 printk(KERN_ALERT __BOOKE_WDT_MSG fmt,##arg)
 +#define booke_wdt_crit(fmt,arg...) \
 +=A0=A0=A0 printk(KERN_ALERT __BOOKE_WDT_MSG fmt,##arg)
 +#if defined(BOOKE_WDT_DEBUG)
+#define booke_wdt_dbg(fmt,arg...) \
 +=A0=A0=A0 printk(KERN_ALERT __BOOKE_WDT_MSG fmt,##arg)
 +#else
 +#define booke_wdt_dbg(fmt,arg...) \
 +=A0=A0=A0=A0=A0=A0=A0 do{}while(0)
 +#endif=A0 /*=A0 WDT_DEBUG=A0 */
 +
 +#endif=A0 /* __KERNEL__=A0 */
 +#endif=A0 /*=A0 _DRIVERS_CHAR_WATCHDOG_BOOKE_WDT_H=A0 */

=20=