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watchdog driver for RB 532

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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: 9896
This commit is contained in:
Felix Fietkau
2007-12-24 22:47:27 +00:00
parent 01e9b18190
commit c65e66ac49
3 changed files with 359 additions and 0 deletions
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240
target/linux/rb532/files/drivers/char/watchdog/rc32434_wdt.c Normal file
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/*
* 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);

76
target/linux/rb532/files/include/asm-mips/rc32434/integ.h Normal file
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#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__

43
target/linux/rb532/patches/520-rc32434_wdt.patch Normal file
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@@ -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