diff options
Diffstat (limited to 'target/linux/adm5120/files-3.8/drivers/watchdog/adm5120_wdt.c')
| -rw-r--r-- | target/linux/adm5120/files-3.8/drivers/watchdog/adm5120_wdt.c | 202 |
1 files changed, 0 insertions, 202 deletions
diff --git a/target/linux/adm5120/files-3.8/drivers/watchdog/adm5120_wdt.c b/target/linux/adm5120/files-3.8/drivers/watchdog/adm5120_wdt.c deleted file mode 100644 index d5d63b27a5..0000000000 --- a/target/linux/adm5120/files-3.8/drivers/watchdog/adm5120_wdt.c +++ /dev/null @@ -1,202 +0,0 @@ -/* - * ADM5120_WDT 0.01: Infineon ADM5120 SoC watchdog driver - * Copyright (c) Ondrej Zajicek <santiago@crfreenet.org>, 2007 - * - * based on - * - * RC32434_WDT 0.01: IDT Interprise 79RC32434 watchdog driver - * - * 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/fs.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/irq.h> - -#include <asm/bootinfo.h> - -#include <asm/mach-adm5120/adm5120_info.h> -#include <asm/mach-adm5120/adm5120_defs.h> -#include <asm/mach-adm5120/adm5120_switch.h> - -#define DEFAULT_TIMEOUT 15 /* (secs) Default is 15 seconds */ -#define MAX_TIMEOUT 327 -/* Max is 327 seconds, counter is 15-bit integer, step is 10 ms */ - -#define NAME "adm5120_wdt" -#define VERSION "0.1" - -static int expect_close; -static int access; -static unsigned int timeout = DEFAULT_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) ")"); -MODULE_LICENSE("GPL"); - - -static inline void wdt_set_timeout(void) -{ - u32 val = (1 << 31) | (((timeout * 100) & 0x7FFF) << 16); - SW_WRITE_REG(SWITCH_REG_WDOG0, val); -} - -/* - It looks like WDOG0-register-write don't modify counter, - but WDOG0-register-read resets counter. -*/ - -static inline void wdt_reset_counter(void) -{ - SW_READ_REG(SWITCH_REG_WDOG0); -} - -static inline void wdt_disable(void) -{ - SW_WRITE_REG(SWITCH_REG_WDOG0, 0x7FFF0000); -} - - - -static int wdt_open(struct inode *inode, struct file *file) -{ - /* Allow only one person to hold it open */ - if (access) - return -EBUSY; - - if (nowayout) - __module_get(THIS_MODULE); - - /* Activate timer */ - wdt_reset_counter(); - wdt_set_timeout(); - 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)) { - wdt_disable(); - 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; - } - } - wdt_reset_counter(); - return len; - } - return 0; -} - -static long wdt_ioctl(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 = "ADM5120_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: - wdt_reset_counter(); - 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; - timeout = new_timeout; - wdt_set_timeout(); - /* Fall */ - case WDIOC_GETTIMEOUT: - return put_user(timeout, (int *)arg); - } -} - -static const struct file_operations wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = wdt_write, - .unlocked_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 "\n"; - -static int __init watchdog_init(void) -{ - int ret; - - ret = misc_register(&wdt_miscdev); - - if (ret) - return ret; - - wdt_disable(); - printk(banner); - - return 0; -} - -static void __exit watchdog_exit(void) -{ - misc_deregister(&wdt_miscdev); -} - -module_init(watchdog_init); -module_exit(watchdog_exit); |