2005-04-16 16:20:36 -06:00
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/*
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2006-10-03 15:01:26 -06:00
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* drivers/char/watchdog/ixp4xx_wdt.c
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2005-04-16 16:20:36 -06:00
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*
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* Watchdog driver for Intel IXP4xx network processors
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*
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* Author: Deepak Saxena <dsaxena@plexity.net>
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*
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* Copyright 2004 (c) MontaVista, Software, Inc.
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* Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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2012-02-15 16:06:19 -07:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2005-04-16 16:20:36 -06:00
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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2019-01-27 06:08:36 -07:00
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#include <linux/of.h>
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2005-04-16 16:20:36 -06:00
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#include <linux/watchdog.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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2008-07-15 05:46:11 -06:00
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#include <linux/uaccess.h>
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2008-08-05 09:14:15 -06:00
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#include <mach/hardware.h>
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2005-04-16 16:20:36 -06:00
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2012-03-05 08:51:11 -07:00
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static bool nowayout = WATCHDOG_NOWAYOUT;
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2005-04-16 16:20:36 -06:00
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static int heartbeat = 60; /* (secs) Default is 1 minute */
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static unsigned long wdt_status;
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static unsigned long boot_status;
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2008-08-10 05:03:41 -06:00
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static DEFINE_SPINLOCK(wdt_lock);
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2005-04-16 16:20:36 -06:00
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#define WDT_TICK_RATE (IXP4XX_PERIPHERAL_BUS_CLOCK * 1000000UL)
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#define WDT_IN_USE 0
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#define WDT_OK_TO_CLOSE 1
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2008-05-19 07:06:48 -06:00
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static void wdt_enable(void)
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2005-04-16 16:20:36 -06:00
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{
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2008-05-19 07:06:48 -06:00
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spin_lock(&wdt_lock);
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2005-04-16 16:20:36 -06:00
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*IXP4XX_OSWK = IXP4XX_WDT_KEY;
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*IXP4XX_OSWE = 0;
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*IXP4XX_OSWT = WDT_TICK_RATE * heartbeat;
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*IXP4XX_OSWE = IXP4XX_WDT_COUNT_ENABLE | IXP4XX_WDT_RESET_ENABLE;
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*IXP4XX_OSWK = 0;
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2008-05-19 07:06:48 -06:00
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spin_unlock(&wdt_lock);
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2005-04-16 16:20:36 -06:00
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}
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2008-05-19 07:06:48 -06:00
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static void wdt_disable(void)
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2005-04-16 16:20:36 -06:00
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{
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2008-05-19 07:06:48 -06:00
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spin_lock(&wdt_lock);
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2005-04-16 16:20:36 -06:00
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*IXP4XX_OSWK = IXP4XX_WDT_KEY;
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*IXP4XX_OSWE = 0;
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*IXP4XX_OSWK = 0;
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2008-05-19 07:06:48 -06:00
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spin_unlock(&wdt_lock);
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2005-04-16 16:20:36 -06:00
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}
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2008-05-19 07:06:48 -06:00
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static int ixp4xx_wdt_open(struct inode *inode, struct file *file)
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2005-04-16 16:20:36 -06:00
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{
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if (test_and_set_bit(WDT_IN_USE, &wdt_status))
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return -EBUSY;
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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wdt_enable();
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2019-03-26 14:51:19 -06:00
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return stream_open(inode, file);
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2005-04-16 16:20:36 -06:00
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}
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static ssize_t
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ixp4xx_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
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{
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if (len) {
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if (!nowayout) {
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size_t i;
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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set_bit(WDT_OK_TO_CLOSE, &wdt_status);
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}
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}
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wdt_enable();
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}
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return len;
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}
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2009-12-26 11:55:22 -07:00
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static const struct watchdog_info ident = {
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2005-04-16 16:20:36 -06:00
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.options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
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WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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.identity = "IXP4xx Watchdog",
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};
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2008-05-19 07:06:48 -06:00
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static long ixp4xx_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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2005-04-16 16:20:36 -06:00
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{
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2006-09-09 09:34:31 -06:00
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int ret = -ENOTTY;
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2005-04-16 16:20:36 -06:00
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int time;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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ret = copy_to_user((struct watchdog_info *)arg, &ident,
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sizeof(ident)) ? -EFAULT : 0;
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break;
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case WDIOC_GETSTATUS:
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ret = put_user(0, (int *)arg);
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break;
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case WDIOC_GETBOOTSTATUS:
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ret = put_user(boot_status, (int *)arg);
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break;
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2008-07-18 05:41:17 -06:00
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case WDIOC_KEEPALIVE:
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wdt_enable();
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ret = 0;
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break;
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2005-04-16 16:20:36 -06:00
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case WDIOC_SETTIMEOUT:
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ret = get_user(time, (int *)arg);
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if (ret)
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break;
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if (time <= 0 || time > 60) {
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ret = -EINVAL;
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break;
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}
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heartbeat = time;
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wdt_enable();
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/* Fall through */
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case WDIOC_GETTIMEOUT:
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ret = put_user(heartbeat, (int *)arg);
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break;
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}
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return ret;
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}
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2008-05-19 07:06:48 -06:00
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static int ixp4xx_wdt_release(struct inode *inode, struct file *file)
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2005-04-16 16:20:36 -06:00
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{
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2008-05-19 07:06:48 -06:00
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if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
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2005-04-16 16:20:36 -06:00
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wdt_disable();
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2008-05-19 07:06:48 -06:00
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else
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2012-02-15 16:06:19 -07:00
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pr_crit("Device closed unexpectedly - timer will not stop\n");
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2005-04-16 16:20:36 -06:00
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clear_bit(WDT_IN_USE, &wdt_status);
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clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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return 0;
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}
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2008-08-06 14:19:41 -06:00
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static const struct file_operations ixp4xx_wdt_fops = {
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2005-04-16 16:20:36 -06:00
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = ixp4xx_wdt_write,
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2008-05-19 07:06:48 -06:00
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.unlocked_ioctl = ixp4xx_wdt_ioctl,
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2005-04-16 16:20:36 -06:00
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.open = ixp4xx_wdt_open,
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.release = ixp4xx_wdt_release,
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};
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2008-08-06 14:19:41 -06:00
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static struct miscdevice ixp4xx_wdt_miscdev = {
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2005-04-16 16:20:36 -06:00
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.minor = WATCHDOG_MINOR,
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2005-08-17 00:58:34 -06:00
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.name = "watchdog",
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2005-04-16 16:20:36 -06:00
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.fops = &ixp4xx_wdt_fops,
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};
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static int __init ixp4xx_wdt_init(void)
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{
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int ret;
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2019-01-27 06:08:36 -07:00
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/*
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* FIXME: we bail out on device tree boot but this really needs
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* to be fixed in a nicer way: this registers the MDIO bus before
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* even matching the driver infrastructure, we should only probe
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* detected hardware.
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*/
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if (of_have_populated_dt())
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return -ENODEV;
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2008-08-10 11:08:10 -06:00
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if (!(read_cpuid_id() & 0xf) && !cpu_is_ixp46x()) {
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2012-02-15 16:06:19 -07:00
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pr_err("Rev. A0 IXP42x CPU detected - watchdog disabled\n");
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2005-04-16 16:20:36 -06:00
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return -ENODEV;
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}
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boot_status = (*IXP4XX_OSST & IXP4XX_OSST_TIMER_WARM_RESET) ?
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WDIOF_CARDRESET : 0;
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ret = misc_register(&ixp4xx_wdt_miscdev);
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if (ret == 0)
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2012-02-15 16:06:19 -07:00
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pr_info("timer heartbeat %d sec\n", heartbeat);
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2005-04-16 16:20:36 -06:00
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return ret;
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}
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static void __exit ixp4xx_wdt_exit(void)
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{
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misc_deregister(&ixp4xx_wdt_miscdev);
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}
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module_init(ixp4xx_wdt_init);
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module_exit(ixp4xx_wdt_exit);
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MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>");
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MODULE_DESCRIPTION("IXP4xx Network Processor Watchdog");
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 60s)");
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2012-03-05 08:51:11 -07:00
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module_param(nowayout, bool, 0);
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2005-04-16 16:20:36 -06:00
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
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MODULE_LICENSE("GPL");
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