+++ /dev/null
-/*
- * 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 = 0;
-static int access = 0;
-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 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 = "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 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 "\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);
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