diff options
Diffstat (limited to 'target/linux/brcm47xx/patches-2.6.30/815-watchdog.patch')
| -rw-r--r-- | target/linux/brcm47xx/patches-2.6.30/815-watchdog.patch | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-2.6.30/815-watchdog.patch b/target/linux/brcm47xx/patches-2.6.30/815-watchdog.patch new file mode 100644 index 0000000000..3d2b2a8df6 --- /dev/null +++ b/target/linux/brcm47xx/patches-2.6.30/815-watchdog.patch @@ -0,0 +1,326 @@ +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> +--- a/drivers/watchdog/Kconfig ++++ b/drivers/watchdog/Kconfig +@@ -764,6 +764,12 @@ config TXX9_WDT + 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 +--- a/drivers/watchdog/Makefile ++++ b/drivers/watchdog/Makefile +@@ -105,6 +105,7 @@ obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o + obj-$(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 + +--- /dev/null ++++ b/drivers/watchdog/bcm47xx_wdt.c +@@ -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); |