+++ /dev/null
-/*
- * 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/resource.h>
-#include <linux/platform_device.h>
-
-#include <bcm63xx_cpu.h>
-#include <bcm63xx_io.h>
-#include <bcm63xx_regs.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 timeout;
-
-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_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) {
- 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;
- }
-
- if (bcm63xx_wdt_settimeout(wdt_time)) {
- bcm63xx_wdt_settimeout(WDT_DEFAULT_TIME);
- printk(KERN_INFO PFX
- ": wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
- wdt_time);
- }
-
- ret = register_reboot_notifier(&bcm63xx_wdt_notifier);
- if (ret) {
- printk(KERN_ERR PFX
- "failed to register reboot_notifier\n");
- return ret;
- }
-
- ret = misc_register(&bcm63xx_wdt_miscdev);
- if (ret < 0) {
- printk(KERN_ERR PFX
- "failed to register watchdog device\n");
- goto unmap;
- }
-
- printk(KERN_INFO PFX " started, timer margin: %d sec\n", WDT_DEFAULT_TIME);
-
- return 0;
-
-unmap:
- unregister_reboot_notifier(&bcm63xx_wdt_notifier);
- 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);
-
- 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");
projects / openwrt / svn-archive / archive.git / blobdiff