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powerpc/watchdog: Allow the Book-E driver to be compiled as a module

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Register the __init and __exit functions in the PowerPC Book-E Watchdog
driver as module entry/exit functions, and modify the Kconfig entry.

Add a .release method for the PowerPC Book-E Watchdog driver, so that the
watchdog is disabled when the driver is closed.

Loosely based on original code from Jiang Yutang <b14898@freescale.com>.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Timur Tabi 2010-09-20 11:23:42 -05:00 committed by Kumar Gala
parent 55ec2fca3e
commit fbdd7144ce
2 changed files with 41 additions and 3 deletions
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5
drivers/watchdog/Kconfig
View File

@ -957,9 +957,12 @@ 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.

39
drivers/watchdog/booke_wdt.c
View File

@ -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
@ -114,6 +114,27 @@ 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 +214,21 @@ 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 +267,9 @@ 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");