watchdog: add support for Broadcom BCM63xx built-in watchdog
This patch adds support for the Broadcom BCM63xx SoC built-in watchdog, it uses one of the BCM63xx hardware timer id. Signed-off-by: Miguel Gaio <miguel.gaio@efixo.com> Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Florian Fainelli
Wim Van Sebroeck
parent
dee00abbbc
commit
b63aa731cd
@ -917,6 +917,16 @@ config OCTEON_WDT
|
||||
from the first interrupt, it is then only poked when the
|
||||
device is written.
|
||||
|
||||
config BCM63XX_WDT
|
||||
tristate "Broadcom BCM63xx hardware watchdog"
|
||||
depends on BCM63XX
|
||||
help
|
||||
Watchdog driver for the built in watchdog hardware in Broadcom
|
||||
BCM63xx SoC.
|
||||
|
||||
To compile this driver as a loadable module, choose M here.
|
||||
The module will be called bcm63xx_wdt.
|
||||
|
||||
# PARISC Architecture
|
||||
|
||||
# POWERPC Architecture
|
||||
|
||||
@ -109,6 +109,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o
|
||||
|
||||
# MIPS Architecture
|
||||
obj-$(CONFIG_BCM47XX_WDT) += bcm47xx_wdt.o
|
||||
obj-$(CONFIG_BCM63XX_WDT) += bcm63xx_wdt.o
|
||||
obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
|
||||
obj-$(CONFIG_INDYDOG) += indydog.o
|
||||
obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
|
||||
|
||||
350
drivers/watchdog/bcm63xx_wdt.c
Normal file
350
drivers/watchdog/bcm63xx_wdt.c
Normal file
@ -0,0 +1,350 @@
|
||||
/*
|
||||
* Broadcom BCM63xx SoC watchdog driver
|
||||
*
|
||||
* Copyright (C) 2007, Miguel Gaio <miguel.gaio@efixo.com>
|
||||
* Copyright (C) 2008, Florian Fainelli <florian@openwrt.org>
|
||||
*
|
||||
* 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/interrupt.h>
|
||||
#include <linux/ptrace.h>
|
||||
#include <linux/resource.h>
|
||||
#include <linux/platform_device.h>
|
||||
|
||||
#include <bcm63xx_cpu.h>
|
||||
#include <bcm63xx_io.h>
|
||||
#include <bcm63xx_regs.h>
|
||||
#include <bcm63xx_timer.h>
|
||||
|
||||
#define PFX KBUILD_MODNAME
|
||||
|
||||
#define WDT_HZ 50000000 /* Fclk */
|
||||
#define WDT_DEFAULT_TIME 30 /* seconds */
|
||||
#define WDT_MAX_TIME 256 /* seconds */
|
||||
|
||||
static struct {
|
||||
void __iomem *regs;
|
||||
struct timer_list timer;
|
||||
int default_ticks;
|
||||
unsigned long inuse;
|
||||
atomic_t ticks;
|
||||
} bcm63xx_wdt_device;
|
||||
|
||||
static int expect_close;
|
||||
|
||||
static int wdt_time = WDT_DEFAULT_TIME;
|
||||
static int nowayout = WATCHDOG_NOWAYOUT;
|
||||
module_param(nowayout, int, 0);
|
||||
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
|
||||
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
||||
|
||||
/* HW functions */
|
||||
static void bcm63xx_wdt_hw_start(void)
|
||||
{
|
||||
bcm_writel(0xfffffffe, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
|
||||
bcm_writel(WDT_START_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
|
||||
bcm_writel(WDT_START_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
|
||||
}
|
||||
|
||||
static void bcm63xx_wdt_hw_stop(void)
|
||||
{
|
||||
bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
|
||||
bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
|
||||
}
|
||||
|
||||
static void bcm63xx_wdt_isr(void *data)
|
||||
{
|
||||
struct pt_regs *regs = get_irq_regs();
|
||||
|
||||
die(PFX " fire", regs);
|
||||
}
|
||||
|
||||
static void bcm63xx_timer_tick(unsigned long unused)
|
||||
{
|
||||
if (!atomic_dec_and_test(&bcm63xx_wdt_device.ticks)) {
|
||||
bcm63xx_wdt_hw_start();
|
||||
mod_timer(&bcm63xx_wdt_device.timer, jiffies + HZ);
|
||||
} else
|
||||
printk(KERN_CRIT PFX ": watchdog will restart system\n");
|
||||
}
|
||||
|
||||
static void bcm63xx_wdt_pet(void)
|
||||
{
|
||||
atomic_set(&bcm63xx_wdt_device.ticks, wdt_time);
|
||||
}
|
||||
|
||||
static void bcm63xx_wdt_start(void)
|
||||
{
|
||||
bcm63xx_wdt_pet();
|
||||
bcm63xx_timer_tick(0);
|
||||
}
|
||||
|
||||
static void bcm63xx_wdt_pause(void)
|
||||
{
|
||||
del_timer_sync(&bcm63xx_wdt_device.timer);
|
||||
bcm63xx_wdt_hw_stop();
|
||||
}
|
||||
|
||||
static int bcm63xx_wdt_settimeout(int new_time)
|
||||
{
|
||||
if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
|
||||
return -EINVAL;
|
||||
|
||||
wdt_time = new_time;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
|
||||
return -EBUSY;
|
||||
|
||||
bcm63xx_wdt_start();
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
static int bcm63xx_wdt_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (expect_close == 42)
|
||||
bcm63xx_wdt_pause();
|
||||
else {
|
||||
printk(KERN_CRIT PFX
|
||||
": Unexpected close, not stopping watchdog!\n");
|
||||
bcm63xx_wdt_start();
|
||||
}
|
||||
clear_bit(0, &bcm63xx_wdt_device.inuse);
|
||||
expect_close = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t bcm63xx_wdt_write(struct file *file, const char *data,
|
||||
size_t len, loff_t *ppos)
|
||||
{
|
||||
if (len) {
|
||||
if (!nowayout) {
|
||||
size_t i;
|
||||
|
||||
/* In case it was set long ago */
|
||||
expect_close = 0;
|
||||
|
||||
for (i = 0; i != len; i++) {
|
||||
char c;
|
||||
if (get_user(c, data + i))
|
||||
return -EFAULT;
|
||||
if (c == 'V')
|
||||
expect_close = 42;
|
||||
}
|
||||
}
|
||||
bcm63xx_wdt_pet();
|
||||
}
|
||||
return len;
|
||||
}
|
||||
|
||||
static struct watchdog_info bcm63xx_wdt_info = {
|
||||
.identity = PFX,
|
||||
.options = WDIOF_SETTIMEOUT |
|
||||
WDIOF_KEEPALIVEPING |
|
||||
WDIOF_MAGICCLOSE,
|
||||
};
|
||||
|
||||
|
||||
static long bcm63xx_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, &bcm63xx_wdt_info,
|
||||
sizeof(bcm63xx_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) {
|
||||
bcm63xx_wdt_pause();
|
||||
retval = 0;
|
||||
}
|
||||
if (new_value & WDIOS_ENABLECARD) {
|
||||
bcm63xx_wdt_start();
|
||||
retval = 0;
|
||||
}
|
||||
|
||||
return retval;
|
||||
|
||||
case WDIOC_KEEPALIVE:
|
||||
bcm63xx_wdt_pet();
|
||||
return 0;
|
||||
|
||||
case WDIOC_SETTIMEOUT:
|
||||
if (get_user(new_value, p))
|
||||
return -EFAULT;
|
||||
|
||||
if (bcm63xx_wdt_settimeout(new_value))
|
||||
return -EINVAL;
|
||||
|
||||
bcm63xx_wdt_pet();
|
||||
|
||||
case WDIOC_GETTIMEOUT:
|
||||
return put_user(wdt_time, p);
|
||||
|
||||
default:
|
||||
return -ENOTTY;
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
static int bcm63xx_wdt_notify_sys(struct notifier_block *this,
|
||||
unsigned long code, void *unused)
|
||||
{
|
||||
if (code == SYS_DOWN || code == SYS_HALT)
|
||||
bcm63xx_wdt_pause();
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
static const struct file_operations bcm63xx_wdt_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = bcm63xx_wdt_write,
|
||||
.unlocked_ioctl = bcm63xx_wdt_ioctl,
|
||||
.open = bcm63xx_wdt_open,
|
||||
.release = bcm63xx_wdt_release,
|
||||
};
|
||||
|
||||
static struct miscdevice bcm63xx_wdt_miscdev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &bcm63xx_wdt_fops,
|
||||
};
|
||||
|
||||
static struct notifier_block bcm63xx_wdt_notifier = {
|
||||
.notifier_call = bcm63xx_wdt_notify_sys,
|
||||
};
|
||||
|
||||
|
||||
static int bcm63xx_wdt_probe(struct platform_device *pdev)
|
||||
{
|
||||
int ret;
|
||||
struct resource *r;
|
||||
|
||||
setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_timer_tick, 0L);
|
||||
|
||||
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!r) {
|
||||
dev_err(&pdev->dev, "failed to get resources\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
bcm63xx_wdt_device.regs = ioremap_nocache(r->start, r->end - r->start);
|
||||
if (!bcm63xx_wdt_device.regs) {
|
||||
dev_err(&pdev->dev, "failed to remap I/O resources\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
|
||||
ret = bcm63xx_timer_register(TIMER_WDT_ID, bcm63xx_wdt_isr, NULL);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "failed to register wdt timer isr\n");
|
||||
goto unmap;
|
||||
}
|
||||
|
||||
if (bcm63xx_wdt_settimeout(wdt_time)) {
|
||||
bcm63xx_wdt_settimeout(WDT_DEFAULT_TIME);
|
||||
dev_info(&pdev->dev,
|
||||
": wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
|
||||
wdt_time);
|
||||
}
|
||||
|
||||
ret = register_reboot_notifier(&bcm63xx_wdt_notifier);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "failed to register reboot_notifier\n");
|
||||
goto unregister_timer;
|
||||
}
|
||||
|
||||
ret = misc_register(&bcm63xx_wdt_miscdev);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "failed to register watchdog device\n");
|
||||
goto unregister_reboot_notifier;
|
||||
}
|
||||
|
||||
dev_info(&pdev->dev, " started, timer margin: %d sec\n",
|
||||
WDT_DEFAULT_TIME);
|
||||
|
||||
return 0;
|
||||
|
||||
unregister_reboot_notifier:
|
||||
unregister_reboot_notifier(&bcm63xx_wdt_notifier);
|
||||
unregister_timer:
|
||||
bcm63xx_timer_unregister(TIMER_WDT_ID);
|
||||
unmap:
|
||||
iounmap(bcm63xx_wdt_device.regs);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int bcm63xx_wdt_remove(struct platform_device *pdev)
|
||||
{
|
||||
if (!nowayout)
|
||||
bcm63xx_wdt_pause();
|
||||
|
||||
misc_deregister(&bcm63xx_wdt_miscdev);
|
||||
|
||||
iounmap(bcm63xx_wdt_device.regs);
|
||||
|
||||
unregister_reboot_notifier(&bcm63xx_wdt_notifier);
|
||||
bcm63xx_timer_unregister(TIMER_WDT_ID);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver bcm63xx_wdt = {
|
||||
.probe = bcm63xx_wdt_probe,
|
||||
.remove = bcm63xx_wdt_remove,
|
||||
.driver = {
|
||||
.name = "bcm63xx-wdt",
|
||||
}
|
||||
};
|
||||
|
||||
static int __init bcm63xx_wdt_init(void)
|
||||
{
|
||||
return platform_driver_register(&bcm63xx_wdt);
|
||||
}
|
||||
|
||||
static void __exit bcm63xx_wdt_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&bcm63xx_wdt);
|
||||
}
|
||||
|
||||
module_init(bcm63xx_wdt_init);
|
||||
module_exit(bcm63xx_wdt_exit);
|
||||
|
||||
MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
|
||||
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
|
||||
MODULE_DESCRIPTION("Driver for the Broadcom BCM63xx SoC watchdog");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
||||
MODULE_ALIAS("platform:bcm63xx-wdt");
|
||||
Loading…
Reference in New Issue
Block a user