add optional driver for the hw watchdog on gateworks avila boards (requires soldering to work properly)
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15300 3c298f89-4303-0410-b956-a3cf2f4a3e73master
Felix Fietkau
parent
6937a43f9b
commit
51181f9c5f
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#
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# Copyright (C) 2008 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk
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include $(INCLUDE_DIR)/kernel.mk
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PKG_NAME:=avila-wdt
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PKG_RELEASE:=1
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include $(INCLUDE_DIR)/package.mk
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define KernelPackage/avila-wdt
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SUBMENU:=Other modules
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TITLE:=GPIO hardware watchdog driver for modified Avila boards
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DEPENDS:=@GPIO_SUPPORT @TARGET_ixp4xx
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FILES:=$(PKG_BUILD_DIR)/avila-wdt.$(LINUX_KMOD_SUFFIX)
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AUTOLOAD:=$(call AutoLoad,10,avila-wdt)
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endef
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MAKE_OPTS:= \
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ARCH="$(LINUX_KARCH)" \
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CROSS_COMPILE="$(TARGET_CROSS)" \
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SUBDIRS="$(PKG_BUILD_DIR)"
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define Build/Prepare
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mkdir -p $(PKG_BUILD_DIR)
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$(CP) ./src/* $(PKG_BUILD_DIR)/
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endef
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define Build/Compile
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$(MAKE) -C "$(LINUX_DIR)" \
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$(MAKE_OPTS) \
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modules
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endef
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$(eval $(call KernelPackage,avila-wdt))
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obj-m := avila-wdt.o
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/*
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* avila-wdt.c
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* Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
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*
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* based on:
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* drivers/char/watchdog/ixp4xx_wdt.c
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*
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* Watchdog driver for Intel IXP4xx network processors
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*
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* Author: Deepak Saxena <dsaxena@plexity.net>
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*
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* Copyright 2004 (c) MontaVista, Software, Inc.
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* Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/uaccess.h>
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#include <mach/hardware.h>
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static int nowayout = WATCHDOG_NOWAYOUT;
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static int heartbeat = 20; /* (secs) Default is 20 seconds */
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static unsigned long wdt_status;
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static atomic_t wdt_counter;
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struct timer_list wdt_timer;
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#define WDT_IN_USE 0
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#define WDT_OK_TO_CLOSE 1
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#define WDT_RUNNING 2
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static void wdt_refresh(unsigned long data)
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{
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if (test_bit(WDT_RUNNING, &wdt_status)) {
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if (atomic_dec_and_test(&wdt_counter)) {
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printk(KERN_WARNING "Avila watchdog expired, expect a reboot soon!\n");
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clear_bit(WDT_RUNNING, &wdt_status);
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return;
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}
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}
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/* strobe to the watchdog */
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gpio_line_set(14, IXP4XX_GPIO_HIGH);
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gpio_line_set(14, IXP4XX_GPIO_LOW);
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mod_timer(&wdt_timer, jiffies + msecs_to_jiffies(500));
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}
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static void wdt_enable(void)
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{
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atomic_set(&wdt_counter, heartbeat * 2);
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/* Disable clock generator output on GPIO 14/15 */
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*IXP4XX_GPIO_GPCLKR &= ~(1 << 8);
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/* activate GPIO 14 out */
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gpio_line_config(14, IXP4XX_GPIO_OUT);
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gpio_line_set(14, IXP4XX_GPIO_LOW);
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if (!test_bit(WDT_RUNNING, &wdt_status))
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wdt_refresh(0);
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set_bit(WDT_RUNNING, &wdt_status);
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}
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static void wdt_disable(void)
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{
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/* NB: we can't turn off the watchdog anymore, so we
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* have to keep running the strobe timer without decrementing
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* the counter */
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clear_bit(WDT_RUNNING, &wdt_status);
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}
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static int avila_wdt_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(WDT_IN_USE, &wdt_status))
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return -EBUSY;
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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wdt_enable();
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return nonseekable_open(inode, file);
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}
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static ssize_t
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avila_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
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{
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if (len) {
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if (!nowayout) {
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size_t i;
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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set_bit(WDT_OK_TO_CLOSE, &wdt_status);
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}
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}
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wdt_enable();
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}
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return len;
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}
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static struct watchdog_info ident = {
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.options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
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WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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.identity = "Avila Watchdog",
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};
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static long avila_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int ret = -ENOTTY;
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int time;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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ret = copy_to_user((struct watchdog_info *)arg, &ident,
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sizeof(ident)) ? -EFAULT : 0;
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break;
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case WDIOC_GETSTATUS:
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ret = put_user(0, (int *)arg);
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break;
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case WDIOC_KEEPALIVE:
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wdt_enable();
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ret = 0;
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break;
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case WDIOC_SETTIMEOUT:
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ret = get_user(time, (int *)arg);
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if (ret)
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break;
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if (time <= 0 || time > 60) {
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ret = -EINVAL;
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break;
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}
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heartbeat = time;
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wdt_enable();
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/* Fall through */
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case WDIOC_GETTIMEOUT:
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ret = put_user(heartbeat, (int *)arg);
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break;
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}
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return ret;
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}
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static int avila_wdt_release(struct inode *inode, struct file *file)
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{
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if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
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wdt_disable();
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else
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printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - "
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"timer will not stop\n");
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clear_bit(WDT_IN_USE, &wdt_status);
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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return 0;
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}
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static const struct file_operations avila_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = avila_wdt_write,
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.unlocked_ioctl = avila_wdt_ioctl,
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.open = avila_wdt_open,
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.release = avila_wdt_release,
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};
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static struct miscdevice avila_wdt_miscdev = {
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.minor = WATCHDOG_MINOR + 1,
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.name = "avila_watchdog",
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.fops = &avila_wdt_fops,
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};
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static int __init avila_wdt_init(void)
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{
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int ret;
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init_timer(&wdt_timer);
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wdt_timer.expires = 0;
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wdt_timer.data = 0;
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wdt_timer.function = wdt_refresh;
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ret = misc_register(&avila_wdt_miscdev);
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if (ret == 0)
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printk(KERN_INFO "Avila Watchdog Timer: heartbeat %d sec\n",
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heartbeat);
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return ret;
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}
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static void __exit avila_wdt_exit(void)
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{
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misc_deregister(&avila_wdt_miscdev);
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}
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module_init(avila_wdt_init);
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module_exit(avila_wdt_exit);
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MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
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MODULE_DESCRIPTION("Gateworks Avila Hardware Watchdog");
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 20s)");
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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