Add bcm63xx_wdt but do not enable it yet
SVN-Revision: 13677v19.07.3_mercusys_ac12_duma
Florian Fainelli
16 years ago
parent
0a74666c12
commit
7ab973e1af
@ -0,0 +1,35 @@
|
||||
/*
|
||||
* This file is subject to the terms and conditions of the GNU General Public
|
||||
* License. See the file "COPYING" in the main directory of this archive
|
||||
* for more details.
|
||||
*
|
||||
* Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
|
||||
*/
|
||||
|
||||
#include <linux/init.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <bcm63xx_cpu.h>
|
||||
|
||||
static struct resource wdt_resources[] = {
|
||||
{
|
||||
.start = -1, /* filled at runtime */
|
||||
.end = -1, /* filled at runtime */
|
||||
.flags = IORESOURCE_MEM,
|
||||
},
|
||||
};
|
||||
|
||||
static struct platform_device bcm63xx_wdt_device = {
|
||||
.name = "bcm63xx-wdt",
|
||||
.id = 0,
|
||||
.num_resources = ARRAY_SIZE(wdt_resources),
|
||||
.resource = wdt_resources,
|
||||
};
|
||||
|
||||
int __init bcm63xx_wdt_register(void)
|
||||
{
|
||||
wdt_resources[0].start = bcm63xx_regset_address(RSET_WDT);
|
||||
wdt_resources[0].end = wdt_resources[0].start;
|
||||
wdt_resources[0].end += RSET_WDT_SIZE - 1;
|
||||
return platform_device_register(&bcm63xx_wdt_device);
|
||||
}
|
||||
@ -0,0 +1,315 @@
|
||||
/*
|
||||
* 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/module.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/watchdog.h>
|
||||
#include <linux/reboot.h>
|
||||
#include <linux/smp_lock.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/timer.h>
|
||||
|
||||
#include <bcm63xx_cpu.h>
|
||||
#include <bcm63xx_io.h>
|
||||
#include <bcm63xx_regs.h>
|
||||
|
||||
#define PFX KBUILD_MODNAME
|
||||
|
||||
#define WDT_HZ 50000000 /* Fclk */
|
||||
#define WDT_INTERVAL (40) /* in seconds */
|
||||
|
||||
static struct {
|
||||
void __iomem *regs;
|
||||
struct completion stop;
|
||||
int running;
|
||||
struct timer_list timer;
|
||||
int queue;
|
||||
int default_ticks;
|
||||
unsigned long inuse;
|
||||
} bcm63xx_wdt_device;
|
||||
|
||||
static int ticks = 100 * WDT_HZ;
|
||||
|
||||
static int expect_close;
|
||||
static int timeout;
|
||||
|
||||
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) ")");
|
||||
|
||||
|
||||
static void bcm63xx_wdt_toggle(void)
|
||||
{
|
||||
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_start(void)
|
||||
{
|
||||
if (!bcm63xx_wdt_device.inuse) {
|
||||
bcm63xx_wdt_toggle();
|
||||
mod_timer(&bcm63xx_wdt_device.timer, jiffies + WDT_INTERVAL);
|
||||
}
|
||||
|
||||
bcm63xx_wdt_device.running++;
|
||||
}
|
||||
|
||||
static void bcm63xx_wdt_stop(void)
|
||||
{
|
||||
if (bcm63xx_wdt_device.running) {
|
||||
bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
|
||||
bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
|
||||
|
||||
bcm63xx_wdt_device.running = 0;
|
||||
}
|
||||
}
|
||||
|
||||
static void bcm63xx_wdt_set(int new_timeout)
|
||||
{
|
||||
new_timeout *= WDT_HZ;
|
||||
bcm_writel(new_timeout, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
|
||||
}
|
||||
|
||||
static void bcm63xx_wdt_reset(void)
|
||||
{
|
||||
ticks = bcm63xx_wdt_device.default_ticks;
|
||||
}
|
||||
|
||||
static void bcm63xx_wdt_update(unsigned long unused)
|
||||
{
|
||||
if (bcm63xx_wdt_device.running)
|
||||
ticks--;
|
||||
|
||||
bcm63xx_wdt_toggle();
|
||||
|
||||
if (bcm63xx_wdt_device.queue && ticks)
|
||||
mod_timer(&bcm63xx_wdt_device.timer,
|
||||
jiffies + WDT_INTERVAL);
|
||||
else
|
||||
complete(&bcm63xx_wdt_device.stop);
|
||||
}
|
||||
|
||||
static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
|
||||
return -EBUSY;
|
||||
|
||||
if (nowayout)
|
||||
__module_get(THIS_MODULE);
|
||||
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
static int bcm63xx_wdt_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (expect_close && nowayout == 0) {
|
||||
bcm63xx_wdt_stop();
|
||||
printk(KERN_INFO PFX ": disabling watchdog timer\n");
|
||||
module_put(THIS_MODULE);
|
||||
} else
|
||||
printk(KERN_CRIT PFX
|
||||
": device closed unexpectedly. WDT will not stop !\n");
|
||||
|
||||
clear_bit(0, &bcm63xx_wdt_device.inuse);
|
||||
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 = 1;
|
||||
}
|
||||
}
|
||||
bcm63xx_wdt_update(0);
|
||||
return len;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
void __user *argp = (void __user *)arg;
|
||||
int new_timeout;
|
||||
unsigned int value;
|
||||
static struct watchdog_info ident = {
|
||||
.options = WDIOF_SETTIMEOUT |
|
||||
WDIOF_KEEPALIVEPING |
|
||||
WDIOF_MAGICCLOSE,
|
||||
.identity = "BCM63xx Watchdog",
|
||||
};
|
||||
switch (cmd) {
|
||||
case WDIOC_KEEPALIVE:
|
||||
bcm63xx_wdt_reset();
|
||||
break;
|
||||
case WDIOC_GETSTATUS:
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
value = bcm_readl(bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
|
||||
if (copy_to_user(argp, &value, sizeof(int)))
|
||||
return -EFAULT;
|
||||
break;
|
||||
case WDIOC_GETSUPPORT:
|
||||
if (copy_to_user(argp, &ident, sizeof(ident)))
|
||||
return -EFAULT;
|
||||
break;
|
||||
case WDIOC_SETOPTIONS:
|
||||
if (copy_from_user(&value, argp, sizeof(int)))
|
||||
return -EFAULT;
|
||||
switch (value) {
|
||||
case WDIOS_ENABLECARD:
|
||||
bcm63xx_wdt_start();
|
||||
break;
|
||||
case WDIOS_DISABLECARD:
|
||||
bcm63xx_wdt_stop();
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
break;
|
||||
case WDIOC_SETTIMEOUT:
|
||||
if (copy_from_user(&new_timeout, argp, sizeof(int)))
|
||||
return -EFAULT;
|
||||
if (new_timeout < 5)
|
||||
return -EINVAL;
|
||||
if (new_timeout > 40)
|
||||
return -EINVAL;
|
||||
bcm63xx_wdt_set(new_timeout);
|
||||
bcm63xx_wdt_toggle();
|
||||
case WDIOC_GETTIMEOUT:
|
||||
return copy_to_user(argp, &timeout, sizeof(int));
|
||||
default:
|
||||
return -ENOTTY;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static 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 int bcm63xx_wdt_probe(struct platform_device *pdev)
|
||||
{
|
||||
int ret;
|
||||
struct resource *r;
|
||||
|
||||
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!r) {
|
||||
printk(KERN_ERR PFX
|
||||
"failed to retrieve resources\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
bcm63xx_wdt_device.regs = ioremap_nocache(r->start, r->end - r->start);
|
||||
if (!bcm63xx_wdt_device.regs) {
|
||||
printk(KERN_ERR PFX
|
||||
"failed to remap I/O resources\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
|
||||
ret = misc_register(&bcm63xx_wdt_miscdev);
|
||||
if (ret < 0) {
|
||||
printk(KERN_ERR PFX
|
||||
"failed to register watchdog device\n");
|
||||
goto unmap;
|
||||
}
|
||||
|
||||
init_completion(&bcm63xx_wdt_device.stop);
|
||||
bcm63xx_wdt_device.queue = 0;
|
||||
|
||||
clear_bit(0, &bcm63xx_wdt_device.inuse);
|
||||
|
||||
setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_wdt_update, 0L);
|
||||
|
||||
bcm63xx_wdt_device.default_ticks = ticks;
|
||||
bcm63xx_wdt_set(ticks);
|
||||
bcm63xx_wdt_start();
|
||||
|
||||
printk(KERN_INFO PFX " started, timer margin: %d sec\n", WDT_INTERVAL);
|
||||
|
||||
return 0;
|
||||
|
||||
unmap:
|
||||
iounmap(bcm63xx_wdt_device.regs);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int bcm63xx_wdt_remove(struct platform_device *pdev)
|
||||
{
|
||||
if (bcm63xx_wdt_device.queue) {
|
||||
bcm63xx_wdt_device.queue = 0;
|
||||
wait_for_completion(&bcm63xx_wdt_device.stop);
|
||||
}
|
||||
|
||||
misc_deregister(&bcm63xx_wdt_miscdev);
|
||||
|
||||
iounmap(bcm63xx_wdt_device.regs);
|
||||
|
||||
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");
|
||||
@ -0,0 +1,6 @@
|
||||
#ifndef BCM63XX_DEV_WDT_H_
|
||||
#define BCM63XX_DEV_WDT_H_
|
||||
|
||||
int bcm63xx_wdt_register(void);
|
||||
|
||||
#endif /* BCM63XX_DEV_WDT_H_ */
|
||||
@ -0,0 +1,29 @@
|
||||
--- a/drivers/watchdog/Makefile 2008-12-05 21:03:02.000000000 +0100
|
||||
+++ b/drivers/watchdog/Makefile 2008-12-14 23:42:27.000000000 +0100
|
||||
@@ -102,6 +102,7 @@
|
||||
obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
|
||||
obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
|
||||
obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
|
||||
+obj-$(CONFIG_BCM63XX_WDT) += bcm63xx_wdt.o
|
||||
|
||||
# PARISC Architecture
|
||||
|
||||
--- a/drivers/watchdog/Kconfig 2008-12-05 21:03:02.000000000 +0100
|
||||
+++ b/drivers/watchdog/Kconfig 2008-12-14 23:43:55.000000000 +0100
|
||||
@@ -704,6 +704,16 @@
|
||||
help
|
||||
Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs.
|
||||
|
||||
+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 thi driver as a loadable module, choose M here.
|
||||
+ The module will be called bcm63xx_wdt.
|
||||
+
|
||||
# PARISC Architecture
|
||||
|
||||
# POWERPC Architecture
|
||||
Loading…
Reference in New Issue