+++ /dev/null
-/*
- * Watchdog driver for Atmel AT91RM9200 (Thunder)
- *
- * Copyright (C) 2003 SAN People (Pty) Ltd
- *
- * 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/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/platform_device.h>
-#include <linux/types.h>
-#include <linux/watchdog.h>
-#include <asm/bitops.h>
-#include <asm/uaccess.h>
-#include <asm/arch/at91_st.h>
-
-
-#define WDT_DEFAULT_TIME 5 /* seconds */
-#define WDT_MAX_TIME 256 /* seconds */
-
-static int wdt_time = WDT_DEFAULT_TIME;
-static int nowayout = WATCHDOG_NOWAYOUT;
-
-module_param(wdt_time, int, 0);
-MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="__MODULE_STRING(WDT_DEFAULT_TIME) ")");
-
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-#endif
-
-
-static unsigned long at91wdt_busy;
-
-/* ......................................................................... */
-
-/*
- * Disable the watchdog.
- */
-static void inline at91_wdt_stop(void)
-{
- at91_sys_write(AT91_ST_WDMR, AT91_ST_EXTEN);
-}
-
-/*
- * Enable and reset the watchdog.
- */
-static void inline at91_wdt_start(void)
-{
- at91_sys_write(AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN | (((65536 * wdt_time) >> 8) & AT91_ST_WDV));
- at91_sys_write(AT91_ST_CR, AT91_ST_WDRST);
-}
-
-/*
- * Reload the watchdog timer. (ie, pat the watchdog)
- */
-static void inline at91_wdt_reload(void)
-{
- at91_sys_write(AT91_ST_CR, AT91_ST_WDRST);
-}
-
-/* ......................................................................... */
-
-/*
- * Watchdog device is opened, and watchdog starts running.
- */
-static int at91_wdt_open(struct inode *inode, struct file *file)
-{
- if (test_and_set_bit(0, &at91wdt_busy))
- return -EBUSY;
-
- at91_wdt_start();
- return nonseekable_open(inode, file);
-}
-
-/*
- * Close the watchdog device.
- * If CONFIG_WATCHDOG_NOWAYOUT is NOT defined then the watchdog is also
- * disabled.
- */
-static int at91_wdt_close(struct inode *inode, struct file *file)
-{
- if (!nowayout)
- at91_wdt_stop(); /* Disable the watchdog when file is closed */
-
- clear_bit(0, &at91wdt_busy);
- return 0;
-}
-
-/*
- * Change the watchdog time interval.
- */
-static int at91_wdt_settimeout(int new_time)
-{
- /*
- * All counting occurs at SLOW_CLOCK / 128 = 0.256 Hz
- *
- * Since WDV is a 16-bit counter, the maximum period is
- * 65536 / 0.256 = 256 seconds.
- */
- if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
- return -EINVAL;
-
- /* Set new watchdog time. It will be used when at91_wdt_start() is called. */
- wdt_time = new_time;
- return 0;
-}
-
-static struct watchdog_info at91_wdt_info = {
- .identity = "at91 watchdog",
- .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
-};
-
-/*
- * Handle commands from user-space.
- */
-static int at91_wdt_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- int new_value;
-
- switch(cmd) {
- case WDIOC_KEEPALIVE:
- at91_wdt_reload(); /* pat the watchdog */
- return 0;
-
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &at91_wdt_info, sizeof(at91_wdt_info)) ? -EFAULT : 0;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_value, p))
- return -EFAULT;
-
- if (at91_wdt_settimeout(new_value))
- return -EINVAL;
-
- /* Enable new time value */
- at91_wdt_start();
-
- /* Return current value */
- return put_user(wdt_time, p);
-
- case WDIOC_GETTIMEOUT:
- return put_user(wdt_time, p);
-
- 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)
- at91_wdt_stop();
- if (new_value & WDIOS_ENABLECARD)
- at91_wdt_start();
- return 0;
-
- default:
- return -ENOTTY;
- }
-}
-
-/*
- * Pat the watchdog whenever device is written to.
- */
-static ssize_t at91_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
-{
- at91_wdt_reload(); /* pat the watchdog */
- return len;
-}
-
-/* ......................................................................... */
-
-static const struct file_operations at91wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .ioctl = at91_wdt_ioctl,
- .open = at91_wdt_open,
- .release = at91_wdt_close,
- .write = at91_wdt_write,
-};
-
-static struct miscdevice at91wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &at91wdt_fops,
-};
-
-static int __init at91wdt_probe(struct platform_device *pdev)
-{
- int res;
-
- if (at91wdt_miscdev.parent)
- return -EBUSY;
- at91wdt_miscdev.parent = &pdev->dev;
-
- res = misc_register(&at91wdt_miscdev);
- if (res)
- return res;
-
- printk("AT91 Watchdog Timer enabled (%d seconds%s)\n", wdt_time, nowayout ? ", nowayout" : "");
- return 0;
-}
-
-static int __exit at91wdt_remove(struct platform_device *pdev)
-{
- int res;
-
- res = misc_deregister(&at91wdt_miscdev);
- if (!res)
- at91wdt_miscdev.parent = NULL;
-
- return res;
-}
-
-static void at91wdt_shutdown(struct platform_device *pdev)
-{
- at91_wdt_stop();
-}
-
-#ifdef CONFIG_PM
-
-static int at91wdt_suspend(struct platform_device *pdev, pm_message_t message)
-{
- at91_wdt_stop();
- return 0;
-}
-
-static int at91wdt_resume(struct platform_device *pdev)
-{
- if (at91wdt_busy)
- at91_wdt_start();
- return 0;
-}
-
-#else
-#define at91wdt_suspend NULL
-#define at91wdt_resume NULL
-#endif
-
-static struct platform_driver at91wdt_driver = {
- .probe = at91wdt_probe,
- .remove = __exit_p(at91wdt_remove),
- .shutdown = at91wdt_shutdown,
- .suspend = at91wdt_suspend,
- .resume = at91wdt_resume,
- .driver = {
- .name = "at91_wdt",
- .owner = THIS_MODULE,
- },
-};
-
-static int __init at91_wdt_init(void)
-{
- /* Check that the heartbeat value is within range; if not reset to the default */
- if (at91_wdt_settimeout(wdt_time)) {
- at91_wdt_settimeout(WDT_DEFAULT_TIME);
- pr_info("at91_wdt: wdt_time value must be 1 <= wdt_time <= 256, using %d\n", wdt_time);
- }
-
- return platform_driver_register(&at91wdt_driver);
-}
-
-static void __exit at91_wdt_exit(void)
-{
- platform_driver_unregister(&at91wdt_driver);
-}
-
-module_init(at91_wdt_init);
-module_exit(at91_wdt_exit);
-
-MODULE_AUTHOR("Andrew Victor");
-MODULE_DESCRIPTION("Watchdog driver for Atmel AT91RM9200");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
git.openpandora.org / pandora-kernel.git / blobdiff