Here is the driver for the hardware watchdog timer integrated in RB 532 (as part of the SoC IDT 79RC32434). File include/asm-mips/rc32434/integ.h is taken from Mikrotik RB 532 kernel patch. Signed-off-by: Ondrej Zajicek <santiago@crfreenet.org> SVN-Revision: 9896master
Felix Fietkau
17 years ago
parent
01e9b18190
commit
c65e66ac49
@ -0,0 +1,240 @@ |
||||
/*
|
||||
* RC32434_WDT 0.01: IDT Interprise 79RC32434 watchdog driver
|
||||
* Copyright (c) Ondrej Zajicek <santiago@crfreenet.org>, 2006 |
||||
* |
||||
* based on |
||||
* |
||||
* SoftDog 0.05: A Software Watchdog Device |
||||
* |
||||
* (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved. |
||||
* |
||||
* 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. |
||||
*
|
||||
*/ |
||||
|
||||
#include <linux/module.h> |
||||
#include <linux/types.h> |
||||
#include <linux/kernel.h> |
||||
#include <linux/fs.h> |
||||
#include <linux/mm.h> |
||||
#include <linux/miscdevice.h> |
||||
#include <linux/watchdog.h> |
||||
#include <linux/reboot.h> |
||||
#include <linux/smp_lock.h> |
||||
#include <linux/init.h> |
||||
#include <asm/bootinfo.h> |
||||
#include <asm/time.h> |
||||
#include <asm/uaccess.h> |
||||
#include <asm/rc32434/integ.h> |
||||
|
||||
#define DEFAULT_TIMEOUT 15 /* (secs) Default is 15 seconds */ |
||||
#define MAX_TIMEOUT 20 |
||||
/*
|
||||
* (secs) Max is 20 seconds
|
||||
* (max frequency of counter is ~200 MHz, counter is 32-bit unsigned int)
|
||||
*/ |
||||
|
||||
#define NAME "rc32434_wdt" |
||||
#define VERSION "0.1" |
||||
|
||||
static INTEG_t rc_wdt = (INTEG_t) INTEG_VirtualAddress;
|
||||
|
||||
static int expect_close = 0; |
||||
static int access = 0; |
||||
static int timeout = 0; |
||||
|
||||
static int nowayout = WATCHDOG_NOWAYOUT; |
||||
module_param(nowayout, int, 0); |
||||
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
||||
MODULE_LICENSE("GPL"); |
||||
|
||||
|
||||
static inline void start_wdt(void) |
||||
{ |
||||
rc_wdt -> wtcount = 0; |
||||
rc_wdt -> errcs |= ERRCS_wre_m; |
||||
rc_wdt -> wtc |= WTC_en_m; |
||||
} |
||||
|
||||
static inline void stop_wdt(void) |
||||
{ |
||||
rc_wdt -> wtc &= ~WTC_en_m; |
||||
rc_wdt -> errcs &= ~ERRCS_wre_m; |
||||
} |
||||
|
||||
static inline void set_wdt(int new_timeout) |
||||
{ |
||||
u32 cmp = new_timeout * mips_hpt_frequency; |
||||
u32 state; |
||||
|
||||
timeout = new_timeout; |
||||
/*
|
||||
* store and disable WTC |
||||
*/ |
||||
state = rc_wdt -> wtc & WTC_en_m; |
||||
rc_wdt -> wtc &= ~WTC_en_m; |
||||
|
||||
rc_wdt -> wtcount = 0; |
||||
rc_wdt -> wtcompare = cmp; |
||||
|
||||
/*
|
||||
* restore WTC |
||||
*/
|
||||
rc_wdt -> wtc |= state; |
||||
} |
||||
|
||||
static inline void update_wdt(void) |
||||
{ |
||||
rc_wdt -> wtcount = 0; |
||||
} |
||||
|
||||
/*
|
||||
* Allow only one person to hold it open |
||||
*/ |
||||
|
||||
static int wdt_open(struct inode *inode, struct file *file) |
||||
{ |
||||
if (access) |
||||
return -EBUSY; |
||||
if (nowayout) { |
||||
__module_get(THIS_MODULE); |
||||
} |
||||
/*
|
||||
* Activate timer |
||||
*/ |
||||
start_wdt(); |
||||
printk(KERN_INFO NAME ": enabling watchdog timer\n"); |
||||
access = 1; |
||||
return 0; |
||||
} |
||||
|
||||
static int wdt_release(struct inode *inode, struct file *file) |
||||
{ |
||||
/*
|
||||
* Shut off the timer. |
||||
* Lock it in if it's a module and we set nowayout |
||||
*/ |
||||
if (expect_close && nowayout == 0) { |
||||
stop_wdt (); |
||||
printk(KERN_INFO NAME ": disabling watchdog timer\n"); |
||||
module_put(THIS_MODULE); |
||||
} else { |
||||
printk (KERN_CRIT NAME ": device closed unexpectedly. WDT will not stop!\n"); |
||||
} |
||||
access = 0; |
||||
return 0; |
||||
} |
||||
|
||||
static ssize_t wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) |
||||
{ |
||||
/*
|
||||
* Refresh the timer. |
||||
*/ |
||||
if (len) { |
||||
if (!nowayout) { |
||||
size_t i; |
||||
|
||||
/* In case it was set long ago */ |
||||
expect_close = 0; |
||||
|
||||
for (i = 0; i != len; i++) { |
||||
char c; |
||||
if (get_user(c, data + i)) |
||||
return -EFAULT; |
||||
if (c == 'V') |
||||
expect_close = 1; |
||||
} |
||||
} |
||||
update_wdt (); |
||||
return len; |
||||
} |
||||
return 0; |
||||
} |
||||
|
||||
static int wdt_ioctl(struct inode *inode, struct file *file, |
||||
unsigned int cmd, unsigned long arg) |
||||
{ |
||||
int new_timeout; |
||||
static struct watchdog_info ident = { |
||||
.options = WDIOF_SETTIMEOUT | |
||||
WDIOF_KEEPALIVEPING | |
||||
WDIOF_MAGICCLOSE, |
||||
.firmware_version = 0, |
||||
.identity = "RC32434_WDT Watchdog", |
||||
}; |
||||
switch (cmd) { |
||||
default: |
||||
return -ENOTTY; |
||||
case WDIOC_GETSUPPORT: |
||||
if(copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))) |
||||
return -EFAULT; |
||||
return 0; |
||||
case WDIOC_GETSTATUS: |
||||
case WDIOC_GETBOOTSTATUS: |
||||
return put_user(0,(int *)arg); |
||||
case WDIOC_KEEPALIVE: |
||||
update_wdt(); |
||||
return 0; |
||||
case WDIOC_SETTIMEOUT: |
||||
if (get_user(new_timeout, (int *)arg)) |
||||
return -EFAULT; |
||||
if (new_timeout < 1) |
||||
return -EINVAL; |
||||
if (new_timeout > MAX_TIMEOUT) |
||||
return -EINVAL; |
||||
set_wdt(new_timeout); |
||||
/* Fall */ |
||||
case WDIOC_GETTIMEOUT: |
||||
return put_user(timeout, (int *)arg); |
||||
} |
||||
} |
||||
|
||||
static struct file_operations wdt_fops = { |
||||
owner: THIS_MODULE, |
||||
llseek: no_llseek, |
||||
write: wdt_write, |
||||
ioctl: wdt_ioctl, |
||||
open: wdt_open, |
||||
release: wdt_release, |
||||
}; |
||||
|
||||
static struct miscdevice wdt_miscdev = { |
||||
minor: WATCHDOG_MINOR, |
||||
name: "watchdog", |
||||
fops: &wdt_fops, |
||||
}; |
||||
|
||||
static char banner[] __initdata = KERN_INFO NAME ": Watchdog Timer version " VERSION ", timer margin: %d sec\n"; |
||||
|
||||
static int __init watchdog_init(void) |
||||
{ |
||||
int ret; |
||||
|
||||
/*
|
||||
* There should be check for RC32434 SoC |
||||
*/ |
||||
if (mips_machgroup != MACH_GROUP_MIKROTIK) return -1; |
||||
|
||||
ret = misc_register(&wdt_miscdev); |
||||
|
||||
if (ret) |
||||
return ret; |
||||
|
||||
stop_wdt(); |
||||
set_wdt(DEFAULT_TIMEOUT); |
||||
|
||||
printk(banner, timeout); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static void __exit watchdog_exit(void) |
||||
{ |
||||
misc_deregister(&wdt_miscdev); |
||||
} |
||||
|
||||
module_init(watchdog_init); |
||||
module_exit(watchdog_exit); |
||||
@ -0,0 +1,76 @@ |
||||
#ifndef __IDT_INTEG_H__ |
||||
#define __IDT_INTEG_H__ |
||||
|
||||
/*******************************************************************************
|
||||
* |
||||
* Copyright 2002 Integrated Device Technology, Inc. |
||||
* All rights reserved. |
||||
* |
||||
* System Integrity register definition. |
||||
* |
||||
* File : $Id: integ.h,v 1.3 2002/06/06 18:34:04 astichte Exp $ |
||||
* |
||||
* Author : ryan.holmQVist@idt.com |
||||
* Date : 20011005 |
||||
* Update : |
||||
* $Log: integ.h,v $ |
||||
* Revision 1.3 2002/06/06 18:34:04 astichte |
||||
* Added XXX_PhysicalAddress and XXX_VirtualAddress |
||||
*
|
||||
* Revision 1.2 2002/06/05 18:32:33 astichte |
||||
* Removed IDTField |
||||
*
|
||||
* Revision 1.1 2002/05/29 17:33:22 sysarch |
||||
* jba File moved from vcode/include/idt/acacia |
||||
* |
||||
******************************************************************************/ |
||||
|
||||
enum |
||||
{ |
||||
INTEG0_PhysicalAddress = 0x18030000, |
||||
INTEG_PhysicalAddress = INTEG0_PhysicalAddress, // Default
|
||||
|
||||
INTEG0_VirtualAddress = 0xb8030000, |
||||
INTEG_VirtualAddress = INTEG0_VirtualAddress, // Default
|
||||
} ; |
||||
|
||||
// if you are looing for CEA, try rst.h
|
||||
typedef struct |
||||
{ |
||||
u32 filler [0xc] ; // 0x30 bytes unused.
|
||||
u32 errcs ; // sticky use ERRCS_
|
||||
u32 wtcount ; // Watchdog timer count reg.
|
||||
u32 wtcompare ; // Watchdog timer timeout value.
|
||||
u32 wtc ; // Watchdog timer control. use WTC_
|
||||
} volatile *INTEG_t ; |
||||
|
||||
enum |
||||
{ |
||||
ERRCS_wto_b = 0, // In INTEG_t -> errcs
|
||||
ERRCS_wto_m = 0x00000001, |
||||
ERRCS_wne_b = 1, // In INTEG_t -> errcs
|
||||
ERRCS_wne_m = 0x00000002, |
||||
ERRCS_ucw_b = 2, // In INTEG_t -> errcs
|
||||
ERRCS_ucw_m = 0x00000004, |
||||
ERRCS_ucr_b = 3, // In INTEG_t -> errcs
|
||||
ERRCS_ucr_m = 0x00000008, |
||||
ERRCS_upw_b = 4, // In INTEG_t -> errcs
|
||||
ERRCS_upw_m = 0x00000010, |
||||
ERRCS_upr_b = 5, // In INTEG_t -> errcs
|
||||
ERRCS_upr_m = 0x00000020, |
||||
ERRCS_udw_b = 6, // In INTEG_t -> errcs
|
||||
ERRCS_udw_m = 0x00000040, |
||||
ERRCS_udr_b = 7, // In INTEG_t -> errcs
|
||||
ERRCS_udr_m = 0x00000080, |
||||
ERRCS_sae_b = 8, // In INTEG_t -> errcs
|
||||
ERRCS_sae_m = 0x00000100, |
||||
ERRCS_wre_b = 9, // In INTEG_t -> errcs
|
||||
ERRCS_wre_m = 0x00000200, |
||||
|
||||
WTC_en_b = 0, // In INTEG_t -> wtc
|
||||
WTC_en_m = 0x00000001, |
||||
WTC_to_b = 1, // In INTEG_t -> wtc
|
||||
WTC_to_m = 0x00000002, |
||||
} ; |
||||
|
||||
#endif // __IDT_INTEG_H__
|
||||
@ -0,0 +1,43 @@ |
||||
diff -ur linux-2.6.22.4.old/arch/mips/kernel/time.c linux-2.6.22.4.new/arch/mips/kernel/time.c
|
||||
--- linux-2.6.22.4.old/arch/mips/kernel/time.c 2007-08-21 06:33:06.000000000 +0200
|
||||
+++ linux-2.6.22.4.new/arch/mips/kernel/time.c 2007-12-24 17:13:43.000000000 +0100
|
||||
@@ -478,3 +478,5 @@
|
||||
EXPORT_SYMBOL(to_tm);
|
||||
EXPORT_SYMBOL(rtc_mips_set_time);
|
||||
EXPORT_SYMBOL(rtc_mips_get_time);
|
||||
+EXPORT_SYMBOL(mips_hpt_frequency);
|
||||
+
|
||||
diff -ur linux-2.6.22.4.old/drivers/char/watchdog/Kconfig linux-2.6.22.4.new/drivers/char/watchdog/Kconfig
|
||||
--- linux-2.6.22.4.old/drivers/char/watchdog/Kconfig 2007-08-21 06:33:06.000000000 +0200
|
||||
+++ linux-2.6.22.4.new/drivers/char/watchdog/Kconfig 2007-12-24 17:13:43.000000000 +0100
|
||||
@@ -575,6 +575,19 @@
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called rm9k_wdt.
|
||||
|
||||
+config RC32434_WDT
|
||||
+ tristate "IDT Interprise 79RC32434 SoC hardware watchdog"
|
||||
+ depends on WATCHDOG && MIKROTIK_RB500
|
||||
+ help
|
||||
+ This is a driver for hardware watchdog integrated in IDT Interprise
|
||||
+ 79RC32434 SoC. 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 rc32434_wdt.
|
||||
+
|
||||
+
|
||||
# S390 Architecture
|
||||
|
||||
config ZVM_WATCHDOG
|
||||
diff -ur linux-2.6.22.4.old/drivers/char/watchdog/Makefile linux-2.6.22.4.new/drivers/char/watchdog/Makefile
|
||||
--- linux-2.6.22.4.old/drivers/char/watchdog/Makefile 2007-08-21 06:33:06.000000000 +0200
|
||||
+++ linux-2.6.22.4.new/drivers/char/watchdog/Makefile 2007-12-24 17:13:43.000000000 +0100
|
||||
@@ -75,6 +75,7 @@
|
||||
obj-$(CONFIG_INDYDOG) += indydog.o
|
||||
obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
|
||||
obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
|
||||
+obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
|
||||
|
||||
# S390 Architecture
|
||||
|
||||
Loading…
Reference in new issue