diff options
Diffstat (limited to 'target/linux/rb532/files/drivers/char/watchdog/rc32434_wdt.c')
| -rw-r--r-- | target/linux/rb532/files/drivers/char/watchdog/rc32434_wdt.c | 240 |
1 files changed, 0 insertions, 240 deletions
diff --git a/target/linux/rb532/files/drivers/char/watchdog/rc32434_wdt.c b/target/linux/rb532/files/drivers/char/watchdog/rc32434_wdt.c deleted file mode 100644 index 2266329de..000000000 --- a/target/linux/rb532/files/drivers/char/watchdog/rc32434_wdt.c +++ /dev/null @@ -1,240 +0,0 @@ -/* - * RC32434_WDT 0.01: IDT Interprise 79RC32434 watchdog driver - * Copyright (c) Ondrej Zajicek <santiago@crfreenet.org>, 2006 - * - * based on - * - * SoftDog 0.05: A Software Watchdog Device - * - * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved. - * - * 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 <asm/bootinfo.h> -#include <asm/time.h> -#include <asm/uaccess.h> -#include <asm/rc32434/integ.h> - -#define DEFAULT_TIMEOUT 15 /* (secs) Default is 15 seconds */ -#define MAX_TIMEOUT 20 -/* - * (secs) Max is 20 seconds - * (max frequency of counter is ~200 MHz, counter is 32-bit unsigned int) - */ - -#define NAME "rc32434_wdt" -#define VERSION "0.1" - -static INTEG_t rc_wdt = (INTEG_t) INTEG_VirtualAddress; - -static int expect_close = 0; -static int access = 0; -static int timeout = 0; - -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) ")"); -MODULE_LICENSE("GPL"); - - -static inline void start_wdt(void) -{ - rc_wdt -> wtcount = 0; - rc_wdt -> errcs |= ERRCS_wre_m; - rc_wdt -> wtc |= WTC_en_m; -} - -static inline void stop_wdt(void) -{ - rc_wdt -> wtc &= ~WTC_en_m; - rc_wdt -> errcs &= ~ERRCS_wre_m; -} - -static inline void set_wdt(int new_timeout) -{ - u32 cmp = new_timeout * mips_hpt_frequency; - u32 state; - - timeout = new_timeout; - /* - * store and disable WTC - */ - state = rc_wdt -> wtc & WTC_en_m; - rc_wdt -> wtc &= ~WTC_en_m; - - rc_wdt -> wtcount = 0; - rc_wdt -> wtcompare = cmp; - - /* - * restore WTC - */ - rc_wdt -> wtc |= state; -} - -static inline void update_wdt(void) -{ - rc_wdt -> wtcount = 0; -} - -/* - * Allow only one person to hold it open - */ - -static int wdt_open(struct inode *inode, struct file *file) -{ - if (access) - return -EBUSY; - if (nowayout) { - __module_get(THIS_MODULE); - } - /* - * Activate timer - */ - start_wdt(); - printk(KERN_INFO NAME ": enabling watchdog timer\n"); - access = 1; - return 0; -} - -static int wdt_release(struct inode *inode, struct file *file) -{ - /* - * Shut off the timer. - * Lock it in if it's a module and we set nowayout - */ - if (expect_close && nowayout == 0) { - stop_wdt (); - printk(KERN_INFO NAME ": disabling watchdog timer\n"); - module_put(THIS_MODULE); - } else { - printk (KERN_CRIT NAME ": device closed unexpectedly. WDT will not stop!\n"); - } - access = 0; - return 0; -} - -static ssize_t wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) -{ - /* - * Refresh the timer. - */ - 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; - } - } - update_wdt (); - return len; - } - return 0; -} - -static int wdt_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - int new_timeout; - static struct watchdog_info ident = { - .options = WDIOF_SETTIMEOUT | - WDIOF_KEEPALIVEPING | - WDIOF_MAGICCLOSE, - .firmware_version = 0, - .identity = "RC32434_WDT Watchdog", - }; - switch (cmd) { - default: - return -ENOTTY; - case WDIOC_GETSUPPORT: - if(copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))) - return -EFAULT; - return 0; - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0,(int *)arg); - case WDIOC_KEEPALIVE: - update_wdt(); - return 0; - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, (int *)arg)) - return -EFAULT; - if (new_timeout < 1) - return -EINVAL; - if (new_timeout > MAX_TIMEOUT) - return -EINVAL; - set_wdt(new_timeout); - /* Fall */ - case WDIOC_GETTIMEOUT: - return put_user(timeout, (int *)arg); - } -} - -static struct file_operations wdt_fops = { - owner: THIS_MODULE, - llseek: no_llseek, - write: wdt_write, - ioctl: wdt_ioctl, - open: wdt_open, - release: wdt_release, -}; - -static struct miscdevice wdt_miscdev = { - minor: WATCHDOG_MINOR, - name: "watchdog", - fops: &wdt_fops, -}; - -static char banner[] __initdata = KERN_INFO NAME ": Watchdog Timer version " VERSION ", timer margin: %d sec\n"; - -static int __init watchdog_init(void) -{ - int ret; - - /* - * There should be check for RC32434 SoC - */ - if (mips_machgroup != MACH_GROUP_MIKROTIK) return -1; - - ret = misc_register(&wdt_miscdev); - - if (ret) - return ret; - - stop_wdt(); - set_wdt(DEFAULT_TIMEOUT); - - printk(banner, timeout); - - return 0; -} - -static void __exit watchdog_exit(void) -{ - misc_deregister(&wdt_miscdev); -} - -module_init(watchdog_init); -module_exit(watchdog_exit); |