mirror of https://github.com/hak5/openwrt.git
add optional driver for the hw watchdog on gateworks avila boards (requires soldering to work properly)
SVN-Revision: 15300lede-17.01
Felix Fietkau
parent
729e0fa4d1
commit
fc75e596d2
|
|
@ -0,0 +1,40 @@
|
|||
#
|
||||
# Copyright (C) 2008 OpenWrt.org
|
||||
#
|
||||
# This is free software, licensed under the GNU General Public License v2.
|
||||
# See /LICENSE for more information.
|
||||
#
|
||||
|
||||
include $(TOPDIR)/rules.mk
|
||||
include $(INCLUDE_DIR)/kernel.mk
|
||||
|
||||
PKG_NAME:=avila-wdt
|
||||
PKG_RELEASE:=1
|
||||
|
||||
include $(INCLUDE_DIR)/package.mk
|
||||
|
||||
define KernelPackage/avila-wdt
|
||||
SUBMENU:=Other modules
|
||||
TITLE:=GPIO hardware watchdog driver for modified Avila boards
|
||||
DEPENDS:=@GPIO_SUPPORT @TARGET_ixp4xx
|
||||
FILES:=$(PKG_BUILD_DIR)/avila-wdt.$(LINUX_KMOD_SUFFIX)
|
||||
AUTOLOAD:=$(call AutoLoad,10,avila-wdt)
|
||||
endef
|
||||
|
||||
MAKE_OPTS:= \
|
||||
ARCH="$(LINUX_KARCH)" \
|
||||
CROSS_COMPILE="$(TARGET_CROSS)" \
|
||||
SUBDIRS="$(PKG_BUILD_DIR)"
|
||||
|
||||
define Build/Prepare
|
||||
mkdir -p $(PKG_BUILD_DIR)
|
||||
$(CP) ./src/* $(PKG_BUILD_DIR)/
|
||||
endef
|
||||
|
||||
define Build/Compile
|
||||
$(MAKE) -C "$(LINUX_DIR)" \
|
||||
$(MAKE_OPTS) \
|
||||
modules
|
||||
endef
|
||||
|
||||
$(eval $(call KernelPackage,avila-wdt))
|
||||
|
|
@ -0,0 +1 @@
|
|||
obj-m := avila-wdt.o
|
||||
|
|
@ -0,0 +1,229 @@
|
|||
/*
|
||||
* avila-wdt.c
|
||||
* Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
|
||||
*
|
||||
* based on:
|
||||
* drivers/char/watchdog/ixp4xx_wdt.c
|
||||
*
|
||||
* Watchdog driver for Intel IXP4xx network processors
|
||||
*
|
||||
* Author: Deepak Saxena <dsaxena@plexity.net>
|
||||
*
|
||||
* Copyright 2004 (c) MontaVista, Software, Inc.
|
||||
* Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
|
||||
*
|
||||
* This file is licensed under the terms of the GNU General Public
|
||||
* License version 2. This program is licensed "as is" without any
|
||||
* warranty of any kind, whether express or implied.
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/watchdog.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <mach/hardware.h>
|
||||
|
||||
static int nowayout = WATCHDOG_NOWAYOUT;
|
||||
static int heartbeat = 20; /* (secs) Default is 20 seconds */
|
||||
static unsigned long wdt_status;
|
||||
static atomic_t wdt_counter;
|
||||
struct timer_list wdt_timer;
|
||||
|
||||
#define WDT_IN_USE 0
|
||||
#define WDT_OK_TO_CLOSE 1
|
||||
#define WDT_RUNNING 2
|
||||
|
||||
static void wdt_refresh(unsigned long data)
|
||||
{
|
||||
if (test_bit(WDT_RUNNING, &wdt_status)) {
|
||||
if (atomic_dec_and_test(&wdt_counter)) {
|
||||
printk(KERN_WARNING "Avila watchdog expired, expect a reboot soon!\n");
|
||||
clear_bit(WDT_RUNNING, &wdt_status);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
/* strobe to the watchdog */
|
||||
gpio_line_set(14, IXP4XX_GPIO_HIGH);
|
||||
gpio_line_set(14, IXP4XX_GPIO_LOW);
|
||||
|
||||
mod_timer(&wdt_timer, jiffies + msecs_to_jiffies(500));
|
||||
}
|
||||
|
||||
static void wdt_enable(void)
|
||||
{
|
||||
atomic_set(&wdt_counter, heartbeat * 2);
|
||||
|
||||
/* Disable clock generator output on GPIO 14/15 */
|
||||
*IXP4XX_GPIO_GPCLKR &= ~(1 << 8);
|
||||
|
||||
/* activate GPIO 14 out */
|
||||
gpio_line_config(14, IXP4XX_GPIO_OUT);
|
||||
gpio_line_set(14, IXP4XX_GPIO_LOW);
|
||||
|
||||
if (!test_bit(WDT_RUNNING, &wdt_status))
|
||||
wdt_refresh(0);
|
||||
set_bit(WDT_RUNNING, &wdt_status);
|
||||
}
|
||||
|
||||
static void wdt_disable(void)
|
||||
{
|
||||
/* NB: we can't turn off the watchdog anymore, so we
|
||||
* have to keep running the strobe timer without decrementing
|
||||
* the counter */
|
||||
clear_bit(WDT_RUNNING, &wdt_status);
|
||||
}
|
||||
|
||||
static int avila_wdt_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (test_and_set_bit(WDT_IN_USE, &wdt_status))
|
||||
return -EBUSY;
|
||||
|
||||
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
||||
wdt_enable();
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
avila_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
|
||||
{
|
||||
if (len) {
|
||||
if (!nowayout) {
|
||||
size_t i;
|
||||
|
||||
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
||||
|
||||
for (i = 0; i != len; i++) {
|
||||
char c;
|
||||
|
||||
if (get_user(c, data + i))
|
||||
return -EFAULT;
|
||||
if (c == 'V')
|
||||
set_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
||||
}
|
||||
}
|
||||
wdt_enable();
|
||||
}
|
||||
return len;
|
||||
}
|
||||
|
||||
static struct watchdog_info ident = {
|
||||
.options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
|
||||
WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
|
||||
.identity = "Avila Watchdog",
|
||||
};
|
||||
|
||||
|
||||
static long avila_wdt_ioctl(struct file *file, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
int ret = -ENOTTY;
|
||||
int time;
|
||||
|
||||
switch (cmd) {
|
||||
case WDIOC_GETSUPPORT:
|
||||
ret = copy_to_user((struct watchdog_info *)arg, &ident,
|
||||
sizeof(ident)) ? -EFAULT : 0;
|
||||
break;
|
||||
|
||||
case WDIOC_GETSTATUS:
|
||||
ret = put_user(0, (int *)arg);
|
||||
break;
|
||||
|
||||
case WDIOC_KEEPALIVE:
|
||||
wdt_enable();
|
||||
ret = 0;
|
||||
break;
|
||||
|
||||
case WDIOC_SETTIMEOUT:
|
||||
ret = get_user(time, (int *)arg);
|
||||
if (ret)
|
||||
break;
|
||||
|
||||
if (time <= 0 || time > 60) {
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
heartbeat = time;
|
||||
wdt_enable();
|
||||
/* Fall through */
|
||||
|
||||
case WDIOC_GETTIMEOUT:
|
||||
ret = put_user(heartbeat, (int *)arg);
|
||||
break;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int avila_wdt_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
|
||||
wdt_disable();
|
||||
else
|
||||
printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - "
|
||||
"timer will not stop\n");
|
||||
clear_bit(WDT_IN_USE, &wdt_status);
|
||||
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static const struct file_operations avila_wdt_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = avila_wdt_write,
|
||||
.unlocked_ioctl = avila_wdt_ioctl,
|
||||
.open = avila_wdt_open,
|
||||
.release = avila_wdt_release,
|
||||
};
|
||||
|
||||
static struct miscdevice avila_wdt_miscdev = {
|
||||
.minor = WATCHDOG_MINOR + 1,
|
||||
.name = "avila_watchdog",
|
||||
.fops = &avila_wdt_fops,
|
||||
};
|
||||
|
||||
static int __init avila_wdt_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
init_timer(&wdt_timer);
|
||||
wdt_timer.expires = 0;
|
||||
wdt_timer.data = 0;
|
||||
wdt_timer.function = wdt_refresh;
|
||||
ret = misc_register(&avila_wdt_miscdev);
|
||||
if (ret == 0)
|
||||
printk(KERN_INFO "Avila Watchdog Timer: heartbeat %d sec\n",
|
||||
heartbeat);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit avila_wdt_exit(void)
|
||||
{
|
||||
misc_deregister(&avila_wdt_miscdev);
|
||||
}
|
||||
|
||||
|
||||
module_init(avila_wdt_init);
|
||||
module_exit(avila_wdt_exit);
|
||||
|
||||
MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
|
||||
MODULE_DESCRIPTION("Gateworks Avila Hardware Watchdog");
|
||||
|
||||
module_param(heartbeat, int, 0);
|
||||
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 20s)");
|
||||
|
||||
module_param(nowayout, int, 0);
|
||||
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
||||
|
||||
Loading…
Reference in New Issue