diff options
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/Kconfig | 22 | ||||
| -rw-r--r-- | drivers/watchdog/ar7_wdt.c | 1 | ||||
| -rw-r--r-- | drivers/watchdog/booke_wdt.c | 47 | ||||
| -rw-r--r-- | drivers/watchdog/cpwd.c | 16 | ||||
| -rw-r--r-- | drivers/watchdog/ep93xx_wdt.c | 1 | ||||
| -rw-r--r-- | drivers/watchdog/octeon-wdt-main.c | 1 | ||||
| -rw-r--r-- | drivers/watchdog/omap_wdt.c | 1 |
7 files changed, 72 insertions, 17 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 24efd8ea41bb..c356146bd712 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -957,12 +957,32 @@ config PIKA_WDT the Warp platform. config BOOKE_WDT - bool "PowerPC Book-E Watchdog Timer" + tristate "PowerPC Book-E Watchdog Timer" depends on BOOKE || 4xx ---help--- + Watchdog driver for PowerPC Book-E chips, such as the Freescale + MPC85xx SOCs and the IBM PowerPC 440. + Please see Documentation/watchdog/watchdog-api.txt for more information. +config BOOKE_WDT_DEFAULT_TIMEOUT + int "PowerPC Book-E Watchdog Timer Default Timeout" + depends on BOOKE_WDT + default 38 if FSL_BOOKE + range 0 63 if FSL_BOOKE + default 3 if !FSL_BOOKE + range 0 3 if !FSL_BOOKE + help + Select the default watchdog timer period to be used by the PowerPC + Book-E watchdog driver. A watchdog "event" occurs when the bit + position represented by this number transitions from zero to one. + + For Freescale Book-E processors, this is a number between 0 and 63. + For other Book-E processors, this is a number between 0 and 3. + + The value can be overidden by the wdt_period command-line parameter. + # PPC64 Architecture config WATCHDOG_RTAS diff --git a/drivers/watchdog/ar7_wdt.c b/drivers/watchdog/ar7_wdt.c index c764c52412e4..b29221783598 100644 --- a/drivers/watchdog/ar7_wdt.c +++ b/drivers/watchdog/ar7_wdt.c @@ -267,6 +267,7 @@ static const struct file_operations ar7_wdt_fops = { .unlocked_ioctl = ar7_wdt_ioctl, .open = ar7_wdt_open, .release = ar7_wdt_release, + .llseek = no_llseek, }; static struct miscdevice ar7_wdt_miscdev = { diff --git a/drivers/watchdog/booke_wdt.c b/drivers/watchdog/booke_wdt.c index 3d49671cdf5a..d11ffb091b0d 100644 --- a/drivers/watchdog/booke_wdt.c +++ b/drivers/watchdog/booke_wdt.c @@ -4,7 +4,7 @@ * Author: Matthew McClintock * Maintainer: Kumar Gala <galak@kernel.crashing.org> * - * Copyright 2005, 2008 Freescale Semiconductor Inc. + * Copyright 2005, 2008, 2010 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 @@ -33,14 +33,8 @@ * occur, and the final time the board will reset. */ -#ifdef CONFIG_FSL_BOOKE -#define WDT_PERIOD_DEFAULT 38 /* Ex. wdt_period=28 bus=333Mhz,reset=~40sec */ -#else -#define WDT_PERIOD_DEFAULT 3 /* Refer to the PPC40x and PPC4xx manuals */ -#endif /* for timing information */ - u32 booke_wdt_enabled; -u32 booke_wdt_period = WDT_PERIOD_DEFAULT; +u32 booke_wdt_period = CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT; #ifdef CONFIG_FSL_BOOKE #define WDTP(x) ((((x)&0x3)<<30)|(((x)&0x3c)<<15)) @@ -114,6 +108,27 @@ static void __booke_wdt_enable(void *data) mtspr(SPRN_TCR, val); } +/** + * booke_wdt_disable - disable the watchdog on the given CPU + * + * This function is called on each CPU. It disables the watchdog on that CPU. + * + * TCR[WRC] cannot be changed once it has been set to non-zero, but we can + * effectively disable the watchdog by setting its period to the maximum value. + */ +static void __booke_wdt_disable(void *data) +{ + u32 val; + + val = mfspr(SPRN_TCR); + val &= ~(TCR_WIE | WDTP_MASK); + mtspr(SPRN_TCR, val); + + /* clear status to make sure nothing is pending */ + __booke_wdt_ping(NULL); + +} + static ssize_t booke_wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { @@ -193,12 +208,21 @@ static int booke_wdt_open(struct inode *inode, struct file *file) return nonseekable_open(inode, file); } +static int booke_wdt_release(struct inode *inode, struct file *file) +{ + on_each_cpu(__booke_wdt_disable, NULL, 0); + booke_wdt_enabled = 0; + + return 0; +} + static const struct file_operations booke_wdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = booke_wdt_write, .unlocked_ioctl = booke_wdt_ioctl, .open = booke_wdt_open, + .release = booke_wdt_release, }; static struct miscdevice booke_wdt_miscdev = { @@ -237,4 +261,9 @@ static int __init booke_wdt_init(void) return ret; } -device_initcall(booke_wdt_init); + +module_init(booke_wdt_init); +module_exit(booke_wdt_exit); + +MODULE_DESCRIPTION("PowerPC Book-E watchdog driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/watchdog/cpwd.c b/drivers/watchdog/cpwd.c index 566343b3c131..eca855a55c0d 100644 --- a/drivers/watchdog/cpwd.c +++ b/drivers/watchdog/cpwd.c @@ -25,7 +25,7 @@ #include <linux/ioport.h> #include <linux/timer.h> #include <linux/slab.h> -#include <linux/smp_lock.h> +#include <linux/mutex.h> #include <linux/io.h> #include <linux/of.h> #include <linux/of_device.h> @@ -89,6 +89,7 @@ struct cpwd { } devs[WD_NUMDEVS]; }; +static DEFINE_MUTEX(cpwd_mutex); static struct cpwd *cpwd_device; /* Sun uses Altera PLD EPF8820ATC144-4 @@ -368,7 +369,7 @@ static int cpwd_open(struct inode *inode, struct file *f) { struct cpwd *p = cpwd_device; - lock_kernel(); + mutex_lock(&cpwd_mutex); switch (iminor(inode)) { case WD0_MINOR: case WD1_MINOR: @@ -376,7 +377,7 @@ static int cpwd_open(struct inode *inode, struct file *f) break; default: - unlock_kernel(); + mutex_unlock(&cpwd_mutex); return -ENODEV; } @@ -386,13 +387,13 @@ static int cpwd_open(struct inode *inode, struct file *f) IRQF_SHARED, DRIVER_NAME, p)) { printk(KERN_ERR PFX "Cannot register IRQ %d\n", p->irq); - unlock_kernel(); + mutex_unlock(&cpwd_mutex); return -EBUSY; } p->initialized = true; } - unlock_kernel(); + mutex_unlock(&cpwd_mutex); return nonseekable_open(inode, f); } @@ -482,9 +483,9 @@ static long cpwd_compat_ioctl(struct file *file, unsigned int cmd, case WIOCSTART: case WIOCSTOP: case WIOCGSTAT: - lock_kernel(); + mutex_lock(&cpwd_mutex); rval = cpwd_ioctl(file, cmd, arg); - unlock_kernel(); + mutex_unlock(&cpwd_mutex); break; /* everything else is handled by the generic compat layer */ @@ -524,6 +525,7 @@ static const struct file_operations cpwd_fops = { .write = cpwd_write, .read = cpwd_read, .release = cpwd_release, + .llseek = no_llseek, }; static int __devinit cpwd_probe(struct platform_device *op, diff --git a/drivers/watchdog/ep93xx_wdt.c b/drivers/watchdog/ep93xx_wdt.c index 59359c9a5e01..726b7df61fd0 100644 --- a/drivers/watchdog/ep93xx_wdt.c +++ b/drivers/watchdog/ep93xx_wdt.c @@ -188,6 +188,7 @@ static const struct file_operations ep93xx_wdt_fops = { .unlocked_ioctl = ep93xx_wdt_ioctl, .open = ep93xx_wdt_open, .release = ep93xx_wdt_release, + .llseek = no_llseek, }; static struct miscdevice ep93xx_wdt_miscdev = { diff --git a/drivers/watchdog/octeon-wdt-main.c b/drivers/watchdog/octeon-wdt-main.c index 2a410170eca6..909923800a02 100644 --- a/drivers/watchdog/octeon-wdt-main.c +++ b/drivers/watchdog/octeon-wdt-main.c @@ -64,6 +64,7 @@ #include <linux/cpu.h> #include <linux/smp.h> #include <linux/fs.h> +#include <linux/irq.h> #include <asm/mipsregs.h> #include <asm/uasm.h> diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c index dbbc5801a0c3..3dd4971160ef 100644 --- a/drivers/watchdog/omap_wdt.c +++ b/drivers/watchdog/omap_wdt.c @@ -254,6 +254,7 @@ static const struct file_operations omap_wdt_fops = { .unlocked_ioctl = omap_wdt_ioctl, .open = omap_wdt_open, .release = omap_wdt_release, + .llseek = no_llseek, }; static int __devinit omap_wdt_probe(struct platform_device *pdev) |
