diff options
Diffstat (limited to 'drivers/watchdog/booke_wdt.c')
| -rw-r--r-- | drivers/watchdog/booke_wdt.c | 88 |
1 files changed, 40 insertions, 48 deletions
diff --git a/drivers/watchdog/booke_wdt.c b/drivers/watchdog/booke_wdt.c index d362f5bf658..770824458d4 100644 --- a/drivers/watchdog/booke_wdt.c +++ b/drivers/watchdog/booke_wdt.c @@ -1,12 +1,10 @@ /* - * drivers/char/watchdog/booke_wdt.c - * * Watchdog timer for PowerPC Book-E systems * * Author: Matthew McClintock * Maintainer: Kumar Gala <galak@kernel.crashing.org> * - * Copyright 2005 Freescale Semiconductor Inc. + * Copyright 2005, 2008 Freescale Semiconductor Inc. * * 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 @@ -16,6 +14,7 @@ #include <linux/module.h> #include <linux/fs.h> +#include <linux/smp.h> #include <linux/miscdevice.h> #include <linux/notifier.h> #include <linux/watchdog.h> @@ -38,7 +37,7 @@ #define WDT_PERIOD_DEFAULT 3 /* Refer to the PPC40x and PPC4xx manuals */ #endif /* for timing information */ -u32 booke_wdt_enabled = 0; +u32 booke_wdt_enabled; u32 booke_wdt_period = WDT_PERIOD_DEFAULT; #ifdef CONFIG_FSL_BOOKE @@ -47,33 +46,31 @@ u32 booke_wdt_period = WDT_PERIOD_DEFAULT; #define WDTP(x) (TCR_WP(x)) #endif -/* - * booke_wdt_ping: - */ -static __inline__ void booke_wdt_ping(void) +static DEFINE_SPINLOCK(booke_wdt_lock); + +static void __booke_wdt_ping(void *data) { mtspr(SPRN_TSR, TSR_ENW|TSR_WIS); } -/* - * booke_wdt_enable: - */ -static __inline__ void booke_wdt_enable(void) +static void booke_wdt_ping(void) +{ + on_each_cpu(__booke_wdt_ping, NULL, 0); +} + +static void __booke_wdt_enable(void *data) { u32 val; /* clear status before enabling watchdog */ - booke_wdt_ping(); + __booke_wdt_ping(NULL); val = mfspr(SPRN_TCR); val |= (TCR_WIE|TCR_WRC(WRC_CHIP)|WDTP(booke_wdt_period)); mtspr(SPRN_TCR, val); } -/* - * booke_wdt_write: - */ -static ssize_t booke_wdt_write (struct file *file, const char __user *buf, +static ssize_t booke_wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { booke_wdt_ping(); @@ -81,15 +78,11 @@ static ssize_t booke_wdt_write (struct file *file, const char __user *buf, } static struct watchdog_info ident = { - .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, - .firmware_version = 0, - .identity = "PowerPC Book-E Watchdog", + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, + .identity = "PowerPC Book-E Watchdog", }; -/* - * booke_wdt_ioctl: - */ -static int booke_wdt_ioctl (struct inode *inode, struct file *file, +static int booke_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { u32 tmp = 0; @@ -97,7 +90,7 @@ static int booke_wdt_ioctl (struct inode *inode, struct file *file, switch (cmd) { case WDIOC_GETSUPPORT: - if (copy_to_user ((struct watchdog_info __user *) arg, &ident, + if (copy_to_user((struct watchdog_info __user *)arg, &ident, sizeof(struct watchdog_info))) return -EFAULT; case WDIOC_GETSTATUS: @@ -132,33 +125,33 @@ static int booke_wdt_ioctl (struct inode *inode, struct file *file, return 0; } -/* - * booke_wdt_open: - */ -static int booke_wdt_open (struct inode *inode, struct file *file) + +static int booke_wdt_open(struct inode *inode, struct file *file) { + spin_lock(&booke_wdt_lock); if (booke_wdt_enabled == 0) { booke_wdt_enabled = 1; - booke_wdt_enable(); - printk (KERN_INFO "PowerPC Book-E Watchdog Timer Enabled (wdt_period=%d)\n", - booke_wdt_period); + on_each_cpu(__booke_wdt_enable, NULL, 0); + printk(KERN_INFO "PowerPC Book-E Watchdog Timer Enabled " + "(wdt_period=%d)\n", booke_wdt_period); } + spin_unlock(&booke_wdt_lock); return nonseekable_open(inode, file); } static const struct file_operations booke_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = booke_wdt_write, - .ioctl = booke_wdt_ioctl, - .open = booke_wdt_open, + .owner = THIS_MODULE, + .llseek = no_llseek, + .write = booke_wdt_write, + .ioctl = booke_wdt_ioctl, + .open = booke_wdt_open, }; static struct miscdevice booke_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &booke_wdt_fops, + .minor = WATCHDOG_MINOR, + .name = "watchdog", + .fops = &booke_wdt_fops, }; static void __exit booke_wdt_exit(void) @@ -166,28 +159,27 @@ static void __exit booke_wdt_exit(void) misc_deregister(&booke_wdt_miscdev); } -/* - * booke_wdt_init: - */ static int __init booke_wdt_init(void) { int ret = 0; - printk (KERN_INFO "PowerPC Book-E Watchdog Timer Loaded\n"); + printk(KERN_INFO "PowerPC Book-E Watchdog Timer Loaded\n"); ident.firmware_version = cur_cpu_spec->pvr_value; ret = misc_register(&booke_wdt_miscdev); if (ret) { - printk (KERN_CRIT "Cannot register miscdev on minor=%d (err=%d)\n", + printk(KERN_CRIT "Cannot register miscdev on minor=%d: %d\n", WATCHDOG_MINOR, ret); return ret; } + spin_lock(&booke_wdt_lock); if (booke_wdt_enabled == 1) { - printk (KERN_INFO "PowerPC Book-E Watchdog Timer Enabled (wdt_period=%d)\n", - booke_wdt_period); - booke_wdt_enable(); + printk(KERN_INFO "PowerPC Book-E Watchdog Timer Enabled " + "(wdt_period=%d)\n", booke_wdt_period); + on_each_cpu(__booke_wdt_enable, NULL, 0); } + spin_unlock(&booke_wdt_lock); return ret; } |