--- /dev/null
+This add watchdog driver for broadcom 47xx device.
+It uses the ssb subsytem to access embeded watchdog device.
+
+Because the watchdog timeout is very short (about 2s), a soft timer is used
+to increase the watchdog period.
+
+Note : A patch for exporting the ssb_watchdog_timer_set will
+be submitted on next linux-mips merge. Without this patch it can't
+be build as a module.
+
+Signed-off-by: Aleksandar Radovanovic <biblbroks@sezampro.rs>
+Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr>
+Index: linux-2.6/drivers/watchdog/Kconfig
+===================================================================
+--- linux-2.6.orig/drivers/watchdog/Kconfig 2009-05-25 22:22:02.000000000 +0200
++++ linux-2.6/drivers/watchdog/Kconfig 2009-06-05 22:05:19.000000000 +0200
+@@ -764,6 +764,12 @@
+ help
+ Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs.
+
++config BCM47XX_WDT
++ tristate "Broadcom BCM47xx Watchdog Timer"
++ depends on BCM47XX
++ help
++ Hardware driver for the Broadcom BCM47xx Watchog Timer.
++
+ # PARISC Architecture
+
+ # POWERPC Architecture
+Index: linux-2.6/drivers/watchdog/Makefile
+===================================================================
+--- linux-2.6.orig/drivers/watchdog/Makefile 2009-05-25 22:22:02.000000000 +0200
++++ linux-2.6/drivers/watchdog/Makefile 2009-05-25 23:02:27.000000000 +0200
+@@ -105,6 +105,7 @@
+ obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
+ obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
+ obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
++obj-$(CONFIG_BCM47XX_WDT) += bcm47xx_wdt.o
+
+ # PARISC Architecture
+
+Index: linux-2.6/drivers/watchdog/bcm47xx_wdt.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6/drivers/watchdog/bcm47xx_wdt.c 2009-06-05 22:25:37.000000000 +0200
+@@ -0,0 +1,286 @@
++/*
++ * Watchdog driver for Broadcom BCM47XX
++ *
++ * Copyright (C) 2008 Aleksandar Radovanovic <biblbroks@sezampro.rs>
++ * Copyright (C) 2009 Matthieu CASTET <castet.matthieu@free.fr>
++ *
++ * 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/bitops.h>
++#include <linux/errno.h>
++#include <linux/fs.h>
++#include <linux/init.h>
++#include <linux/kernel.h>
++#include <linux/miscdevice.h>
++#include <linux/module.h>
++#include <linux/moduleparam.h>
++#include <linux/reboot.h>
++#include <linux/types.h>
++#include <linux/uaccess.h>
++#include <linux/watchdog.h>
++#include <linux/timer.h>
++#include <linux/jiffies.h>
++#include <linux/ssb/ssb_embedded.h>
++#include <asm/mach-bcm47xx/bcm47xx.h>
++
++#define DRV_NAME "bcm47xx_wdt"
++
++#define WDT_DEFAULT_TIME 30 /* seconds */
++#define WDT_MAX_TIME 256 /* seconds */
++
++static int wdt_time = WDT_DEFAULT_TIME;
++static int nowayout = WATCHDOG_NOWAYOUT;
++
++module_param(wdt_time, int, 0);
++MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
++ __MODULE_STRING(WDT_DEFAULT_TIME) ")");
++
++#ifdef CONFIG_WATCHDOG_NOWAYOUT
++module_param(nowayout, int, 0);
++MODULE_PARM_DESC(nowayout,
++ "Watchdog cannot be stopped once started (default="
++ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
++#endif
++
++static unsigned long bcm47xx_wdt_busy;
++static char expect_release;
++static struct timer_list wdt_timer;
++static atomic_t ticks;
++
++static inline void bcm47xx_wdt_hw_start(void)
++{
++ /* this is 2,5s on 100Mhz clock and 2s on 133 Mhz */
++ ssb_watchdog_timer_set(&ssb_bcm47xx, 0xfffffff);
++}
++
++static inline int bcm47xx_wdt_hw_stop(void)
++{
++ return ssb_watchdog_timer_set(&ssb_bcm47xx, 0);
++}
++
++static void bcm47xx_timer_tick(unsigned long unused)
++{
++ if (!atomic_dec_and_test(&ticks)) {
++ bcm47xx_wdt_hw_start();
++ mod_timer(&wdt_timer, jiffies + HZ);
++ } else {
++ printk(KERN_CRIT DRV_NAME "Watchdog will fire soon!!!\n");
++ }
++}
++
++static inline void bcm47xx_wdt_pet(void)
++{
++ atomic_set(&ticks, wdt_time);
++}
++
++static void bcm47xx_wdt_start(void)
++{
++ bcm47xx_wdt_pet();
++ bcm47xx_timer_tick(0);
++}
++
++static void bcm47xx_wdt_pause(void)
++{
++ del_timer_sync(&wdt_timer);
++ bcm47xx_wdt_hw_stop();
++}
++
++static void bcm47xx_wdt_stop(void)
++{
++ bcm47xx_wdt_pause();
++}
++
++static int bcm47xx_wdt_settimeout(int new_time)
++{
++ if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
++ return -EINVAL;
++
++ wdt_time = new_time;
++ return 0;
++}
++
++static int bcm47xx_wdt_open(struct inode *inode, struct file *file)
++{
++ if (test_and_set_bit(0, &bcm47xx_wdt_busy))
++ return -EBUSY;
++
++ bcm47xx_wdt_start();
++ return nonseekable_open(inode, file);
++}
++
++static int bcm47xx_wdt_release(struct inode *inode, struct file *file)
++{
++ if (expect_release == 42) {
++ bcm47xx_wdt_stop();
++ } else {
++ printk(KERN_CRIT DRV_NAME
++ ": Unexpected close, not stopping watchdog!\n");
++ bcm47xx_wdt_start();
++ }
++
++ clear_bit(0, &bcm47xx_wdt_busy);
++ expect_release = 0;
++ return 0;
++}
++
++static ssize_t bcm47xx_wdt_write(struct file *file, const char __user *data,
++ size_t len, loff_t *ppos)
++{
++ if (len) {
++ if (!nowayout) {
++ size_t i;
++
++ expect_release = 0;
++
++ for (i = 0; i != len; i++) {
++ char c;
++ if (get_user(c, data + i))
++ return -EFAULT;
++ if (c == 'V')
++ expect_release = 42;
++ }
++ }
++ bcm47xx_wdt_pet();
++ }
++ return len;
++}
++
++static struct watchdog_info bcm47xx_wdt_info = {
++ .identity = DRV_NAME,
++ .options = WDIOF_SETTIMEOUT |
++ WDIOF_KEEPALIVEPING |
++ WDIOF_MAGICCLOSE,
++};
++
++static long bcm47xx_wdt_ioctl(struct file *file,
++ unsigned int cmd, unsigned long arg)
++{
++ void __user *argp = (void __user *)arg;
++ int __user *p = argp;
++ int new_value, retval = -EINVAL;;
++
++ switch (cmd) {
++ case WDIOC_GETSUPPORT:
++ return copy_to_user(argp, &bcm47xx_wdt_info,
++ sizeof(bcm47xx_wdt_info)) ? -EFAULT : 0;
++
++ case WDIOC_GETSTATUS:
++ case WDIOC_GETBOOTSTATUS:
++ return put_user(0, p);
++
++ case WDIOC_SETOPTIONS:
++ if (get_user(new_value, p))
++ return -EFAULT;
++
++ if (new_value & WDIOS_DISABLECARD) {
++ bcm47xx_wdt_stop();
++ retval = 0;
++ }
++
++ if (new_value & WDIOS_ENABLECARD) {
++ bcm47xx_wdt_start();
++ retval = 0;
++ }
++
++ return retval;
++
++ case WDIOC_KEEPALIVE:
++ bcm47xx_wdt_pet();
++ return 0;
++
++ case WDIOC_SETTIMEOUT:
++ if (get_user(new_value, p))
++ return -EFAULT;
++
++ if (bcm47xx_wdt_settimeout(new_value))
++ return -EINVAL;
++
++ bcm47xx_wdt_pet();
++
++ case WDIOC_GETTIMEOUT:
++ return put_user(wdt_time, p);
++
++ default:
++ return -ENOTTY;
++ }
++}
++
++static int bcm47xx_wdt_notify_sys(struct notifier_block *this,
++ unsigned long code, void *unused)
++{
++ if (code == SYS_DOWN || code == SYS_HALT)
++ bcm47xx_wdt_stop();
++ return NOTIFY_DONE;
++}
++
++static const struct file_operations bcm47xx_wdt_fops = {
++ .owner = THIS_MODULE,
++ .llseek = no_llseek,
++ .unlocked_ioctl = bcm47xx_wdt_ioctl,
++ .open = bcm47xx_wdt_open,
++ .release = bcm47xx_wdt_release,
++ .write = bcm47xx_wdt_write,
++};
++
++static struct miscdevice bcm47xx_wdt_miscdev = {
++ .minor = WATCHDOG_MINOR,
++ .name = "watchdog",
++ .fops = &bcm47xx_wdt_fops,
++};
++
++static struct notifier_block bcm47xx_wdt_notifier = {
++ .notifier_call = bcm47xx_wdt_notify_sys,
++};
++
++static int __init bcm47xx_wdt_init(void)
++{
++ int ret;
++
++ if (bcm47xx_wdt_hw_stop() < 0)
++ return -ENODEV;
++
++ setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
++
++ if (bcm47xx_wdt_settimeout(wdt_time)) {
++ bcm47xx_wdt_settimeout(WDT_DEFAULT_TIME);
++ printk(KERN_INFO DRV_NAME
++ ": wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
++ wdt_time);
++ }
++
++ ret = register_reboot_notifier(&bcm47xx_wdt_notifier);
++ if (ret)
++ return ret;
++
++ ret = misc_register(&bcm47xx_wdt_miscdev);
++ if (ret) {
++ unregister_reboot_notifier(&bcm47xx_wdt_notifier);
++ return ret;
++ }
++
++ printk(KERN_INFO "BCM47xx Watchdog Timer enabled (%d seconds%s)\n",
++ wdt_time, nowayout ? ", nowayout" : "");
++ return 0;
++}
++
++static void __exit bcm47xx_wdt_exit(void)
++{
++ if (!nowayout)
++ bcm47xx_wdt_stop();
++
++ misc_deregister(&bcm47xx_wdt_miscdev);
++
++ unregister_reboot_notifier(&bcm47xx_wdt_notifier);
++}
++
++module_init(bcm47xx_wdt_init);
++module_exit(bcm47xx_wdt_exit);
++
++MODULE_AUTHOR("Aleksandar Radovanovic");
++MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
++MODULE_LICENSE("GPL");
++MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
projects / openwrt / staging / ansuel.git / commitdiff