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[Linux-mips-commits]CVS: linux/drivers/char tx4927wdt.c,NONE,1.1 Config.in,1.36,1.37 Makefile,1.30,1.31
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From: Paul M. <le...@us...> - 2002-05-31 20:12:24
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Update of /cvsroot/linux-mips/linux/drivers/char
In directory usw-pr-cvs1:/tmp/cvs-serv31520/drivers/char
Modified Files:
Config.in Makefile
Added Files:
tx4927wdt.c
Log Message:
TX4927 WDT.
--- NEW FILE: tx4927wdt.c ---
/*
* drivers/char/tx4927wdt.c
*
* Watchdog driver for integrated watchdog in the TX4927 processors.
*
* Copyright (C) 2002 Paul Mundt <le...@ch...>
*
* 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/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <linux/miscdevice.h>
#include <linux/reboot.h>
#include <linux/notifier.h>
#include <linux/ioport.h>
#include <linux/fs.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/tx4927.h>
#ifndef CONFIG_CPU_TX49XX
#error "Can't use TX49XX watchdog on non-TX49XX processor."
#endif
#ifndef minor
#define minor(x) MINOR(x)
#endif
#define BIT(x) (1UL << (x))
/*
* The TX4927 consists of 3 timer channels:
*
* 0: Interval Timer mode (default)
* 1: Pulse Generator mode
* 2: Watchdog Timer mode
*
* The watchdog exists as the third timer channel. When in
* watchdog mode, the first 2 timer channels are reserved.
*/
/* Registers */
#define TX4927_TMTCR2 0xf200 /* Timer Control Register 2 */
#define TX4927_TMTISR2 0xf204 /* Timer Interrupt Status Register 2 */
#define TX4927_TMCPRA2 0xf208 /* Compare Register A 2 */
#define TX4927_TMCPRB2 0xf20c /* Reserved */
#define TX4927_TMITMR2 0xf210 /* Interval Timer Mode Register 2 */
#define TX4927_TMCCDR2 0xf220 /* Divide Cycle Register 2 */
#define TX4927_TMWGMR2 0xf230 /* Reserved */
#define TX4927_TMWTMR2 0xf240 /* Watchdog Timer Mode Register 2 */
#define TX4927_TMTRR2 0xf2f0 /* Timer Read Register 2 */
/* Flags */
#define TMTCR2_TCE BIT(7) /* Timer Counter Enable */
#define TMTCR2_TMODE_HI BIT(1) /* Timer Mode (high bit) */
#define TMTCR2_TMODE_LO BIT(0) /* Timer Mode (low bit) */
#define TMWTMR2_TWIE BIT(15) /* Watchdog Timer Signaling Enable (NMI) */
#define TMWTMR2_WDIS BIT(7) /* Watchdog Timer Disable */
#define TMWTMR2_TWC BIT(0) /* Watchdog Timer Clear */
/* General Watchdog Flags */
#define WDT_OPEN 0 /* Device is open */
#define WDT_NOWAYOUT 1 /* Don't stop the WDT on exit */
#define WDT_GEN_NMI 2 /* Generate a NMI on overflow */
static unsigned long next_heartbeat;
static unsigned long tx4927_flags = 0;
static struct watchdog_info tx4927_wdt_info;
static struct timer_list timer;
static int compare = CONFIG_TX4927_WDT_CMP;
static int multiplier = CONFIG_TX4927_WDT_MULT;
static int divisor = CONFIG_TX4927_WDT_DIV;
#ifdef CONFIG_TX4927_WDT_NMI
static int action = 1;
#else
static int action = 0;
#endif
#ifdef CONFIG_WATCHDOG_NOWAYOUT
static int nowayout = 1;
#else
static int nowayout = 0;
#endif
static void tx4927_wdt_start(void)
{
u32 tmp;
timer.expires = tx4927_in32(TX4927_TMCPRA2) / divisor;
next_heartbeat = tx4927_in32(TX4927_TMCPRA2) * multiplier;
add_timer(&timer);
tmp = tx4927_in32(TX4927_TMTCR2);
tmp &= ~TMTCR2_TMODE_LO;
tmp |= TMTCR2_TMODE_HI;
tx4927_out32(TX4927_TMTCR2, tmp);
/*
* Trigger a NMI on overflow if desired.
*/
if (test_bit(WDT_GEN_NMI, &tx4927_flags)) {
tmp = tx4927_in32(TX4927_TMWTMR2);
tmp |= TMWTMR2_TWIE;
tx4927_out32(TX4927_TMWTMR2, tmp);
}
/*
* Override the default overflow value if desired.
*/
if (compare)
tx4927_out32(TX4927_TMCPRA2, compare);
}
static void tx4927_wdt_stop(void)
{
u32 tmp;
del_timer(&timer);
tmp = tx4927_in32(TX4927_TMWTMR2);
tmp |= TMWTMR2_WDIS;
tx4927_out32(TX4927_TMWTMR2, tmp);
tmp = tx4927_in32(TX4927_TMTCR2);
tmp &= ~TMTCR2_TCE;
tx4927_out32(TX4927_TMTCR2, tmp);
}
static void tx4927_wdt_ping(unsigned long data)
{
u32 tmp;
if (!time_before(jiffies, next_heartbeat))
return;
tmp = tx4927_in32(TX4927_TMWTMR2);
tmp |= TMWTMR2_TWC;
tx4927_out32(TX4927_TMWTMR2, tmp);
timer.expires = tx4927_in32(TX4927_TMCPRA2) / divisor;
add_timer(&timer);
}
static int tx4927_wdt_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
switch (cmd) {
case WDIOC_GETSUPPORT:
if (copy_to_user((struct watchdog_info *)arg,
&tx4927_wdt_info, sizeof(tx4927_wdt_info)))
return -EFAULT;
break;
case WDIOC_KEEPALIVE:
next_heartbeat = tx4927_in32(TX4927_TMCPRA2) * multiplier;
break;
default:
return -ENOTTY;
}
return 0;
}
static int tx4927_wdt_open(struct inode *inode, struct file *file)
{
if (minor(inode->i_rdev) != WATCHDOG_MINOR)
return -ENODEV;
if (test_and_set_bit(WDT_OPEN, &tx4927_flags))
return -EBUSY;
tx4927_wdt_start();
return 0;
}
static int tx4927_wdt_release(struct inode *inode, struct file *file)
{
if (minor(inode->i_rdev) != WATCHDOG_MINOR)
return -ENODEV;
if (!test_bit(WDT_NOWAYOUT, &tx4927_flags))
tx4927_wdt_stop();
clear_bit(WDT_OPEN, &tx4927_flags);
return 0;
}
static ssize_t tx4927_wdt_write(struct file *file, const char *buf,
size_t count, loff_t *ppos)
{
if (ppos != &file->f_pos)
return -ESPIPE;
if (count) {
next_heartbeat = tx4927_in32(TX4927_TMCPRA2) * multiplier;
return 1;
}
return 0;
}
static int tx4927_wdt_notify_sys(struct notifier_block *this,
unsigned long code, void *unusued)
{
if (code == SYS_DOWN || code == SYS_HALT)
tx4927_wdt_stop();
return NOTIFY_DONE;
}
static struct file_operations tx4927_wdt_fops = {
owner: THIS_MODULE,
llseek: no_llseek,
write: tx4927_wdt_write,
ioctl: tx4927_wdt_ioctl,
open: tx4927_wdt_open,
release: tx4927_wdt_release,
};
static struct watchdog_info tx4927_wdt_info = {
options: WDIOF_KEEPALIVEPING,
identity: "TX4927 WDT",
firmware_version: 1,
};
static struct notifier_block tx4927_wdt_notifier = {
notifier_call: tx4927_wdt_notify_sys,
priority: 0,
};
static struct miscdevice tx4927_wdt_miscdev = {
minor: WATCHDOG_MINOR,
name: "watchdog",
fops: &tx4927_wdt_fops,
};
static int __init tx4927_wdt_init(void)
{
if (misc_register(&tx4927_wdt_miscdev))
return -EINVAL;
if (register_reboot_notifier(&tx4927_wdt_notifier)) {
misc_deregister(&tx4927_wdt_miscdev);
return -EINVAL;
}
if (nowayout)
set_bit(WDT_NOWAYOUT, &tx4927_flags);
if (action)
set_bit(WDT_GEN_NMI, &tx4927_flags);
init_timer(&timer);
timer.function = tx4927_wdt_ping;
timer.data = 0;
return 0;
}
static void __exit tx4927_wdt_exit(void)
{
unregister_reboot_notifier(&tx4927_wdt_notifier);
misc_deregister(&tx4927_wdt_miscdev);
}
EXPORT_NO_SYMBOLS;
MODULE_AUTHOR("Paul Mundt <le...@ch...>");
MODULE_DESCRIPTION("TX4927 watchdog driver");
MODULE_LICENSE("GPL");
MODULE_PARM(nowayout, "i");
MODULE_PARM_DESC(nowayout, "Watchdog can't be stopped once started. Defaults to CONFIG_WATCHDOG_NOWAYOUT.");
MODULE_PARM(multiplier, "i");
MODULE_PARM_DESC(multiplier, "Heartbeat multiplier (next heartbeat = overflow value * multiplier). Defaults to CONFIG_TX4927_WDT_MULT.");
MODULE_PARM(divisor, "i");
MODULE_PARM_DESC(divisor, "Timer divisor (next counter clear = overflow value / divisor). Defaults to CONFIG_TX4927_WDT_DIV.");
MODULE_PARM(action, "i");
MODULE_PARM_DESC(action, "Action on counter overflow (0 = reset, 1 = NMI). Defaults to reset.");
MODULE_PARM(compare, "i");
MODULE_PARM_DESC(compare, "Overflow value. Defaults to 0xffffffff.");
module_init(tx4927_wdt_init);
module_exit(tx4927_wdt_exit);
Index: Config.in
===================================================================
RCS file: /cvsroot/linux-mips/linux/drivers/char/Config.in,v
retrieving revision 1.36
retrieving revision 1.37
diff -u -d -r1.36 -r1.37
--- Config.in 29 May 2002 00:23:16 -0000 1.36
+++ Config.in 31 May 2002 20:12:20 -0000 1.37
@@ -224,6 +224,13 @@
tristate ' ZF MachZ Watchdog' CONFIG_MACHZ_WDT
dep_tristate ' Indy/I2 Hardware Watchdog' CONFIG_INDYDOG $CONFIG_SGI_IP22
dep_tristate ' NEC VR41xx Watchdog (DSU)' CONFIG_VR41XX_WDT $CONFIG_CPU_VR41XX
+ dep_tristate ' Toshiba TX4927 Watchdog' CONFIG_TX4927_WDT $CONFIG_CPU_TX49XX
+ if [ "$CONFIG_TX4927_WDT" != "n" ]; then
+ int ' Heartbeat multiplier' CONFIG_TX4927_WDT_MULT 2
+ int ' Timer divisor' CONFIG_TX4927_WDT_DIV 2
+ bool ' Trigger NMI on overflow' CONFIG_TX4927_WDT_NMI
+ int ' Overflow value (overrides default)' CONFIG_TX4927_WDT_CMP 0
+ fi
fi
endmenu
Index: Makefile
===================================================================
RCS file: /cvsroot/linux-mips/linux/drivers/char/Makefile,v
retrieving revision 1.30
retrieving revision 1.31
diff -u -d -r1.30 -r1.31
--- Makefile 29 May 2002 00:23:16 -0000 1.30
+++ Makefile 31 May 2002 20:12:20 -0000 1.31
@@ -265,6 +265,7 @@
obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
obj-$(CONFIG_INDYDOG) += indydog.o
obj-$(CONFIG_VR41XX_WDT) += vr41xxwdt.o
+obj-$(CONFIG_TX4927_WDT) += tx4927wdt.o
obj-$(CONFIG_BUTTONS) += buttons.o
obj-$(CONFIG_VR41XX_GPIO_BUTTONS) += gpiobtns.o
obj-$(CONFIG_VR41XX_E105_BUTTONS) += e105btns.o
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