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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * MixCom Watchdog: A Simple Hardware Watchdog Device
3 * Based on Softdog driver by Alan Cox and PC Watchdog driver by Ken Hollis
4 *
5 * Author: Gergely Madarasz <gorgo@itc.hu>
6 *
7 * Copyright (c) 1999 ITConsult-Pro Co. <info@itc.hu>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * Version 0.1 (99/04/15):
15 * - first version
16 *
17 * Version 0.2 (99/06/16):
18 * - added kernel timer watchdog ping after close
19 * since the hardware does not support watchdog shutdown
20 *
21 * Version 0.3 (99/06/21):
22 * - added WDIOC_GETSTATUS and WDIOC_GETSUPPORT ioctl calls
23 *
24 * Version 0.3.1 (99/06/22):
25 * - allow module removal while internal timer is active,
26 * print warning about probable reset
27 *
28 * Version 0.4 (99/11/15):
29 * - support for one more type board
30 *
31 * Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com>
Alan Cox39309642008-05-19 14:07:04 +010032 * - added nowayout module option to override
33 * CONFIG_WATCHDOG_NOWAYOUT
Wim Van Sebroeckb10958d2007-06-03 15:22:32 +000034 *
35 * Version 0.6 (2002/04/12): Rob Radez <rob@osinvestor.com>
36 * - make mixcomwd_opened unsigned,
37 * removed lock_kernel/unlock_kernel from mixcomwd_release,
38 * modified ioctl a bit to conform to API
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 *
40 */
41
Joe Perches27c766a2012-02-15 15:06:19 -080042#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
43
Wim Van Sebroeckb10958d2007-06-03 15:22:32 +000044#define VERSION "0.6"
Wim Van Sebroeck1c067312007-06-04 18:35:41 +000045#define WATCHDOG_NAME "mixcomwd"
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47#include <linux/module.h>
48#include <linux/moduleparam.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/types.h>
50#include <linux/miscdevice.h>
51#include <linux/ioport.h>
52#include <linux/watchdog.h>
53#include <linux/fs.h>
54#include <linux/reboot.h>
55#include <linux/init.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080056#include <linux/jiffies.h>
57#include <linux/timer.h>
Alan Cox39309642008-05-19 14:07:04 +010058#include <linux/uaccess.h>
59#include <linux/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Wim Van Sebroeck63e6e172007-06-03 15:39:25 +000061/*
62 * We have two types of cards that can be probed:
63 * 1) The Mixcom cards: these cards can be found at addresses
64 * 0x180, 0x280, 0x380 with an additional offset of 0xc10.
65 * (Or 0xd90, 0xe90, 0xf90).
66 * 2) The FlashCOM cards: these cards can be set up at
67 * 0x300 -> 0x378, in 0x8 jumps with an offset of 0x04.
68 * (Or 0x304 -> 0x37c in 0x8 jumps).
69 * Each card has it's own ID.
70 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#define MIXCOM_ID 0x11
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#define FLASHCOM_ID 0x18
Wim Van Sebroeck21baf3c2007-06-03 20:46:05 +000073static struct {
74 int ioport;
75 int id;
Bill Pemberton1d131362012-11-19 13:24:05 -050076} mixcomwd_io_info[] = {
Wim Van Sebroeck21baf3c2007-06-03 20:46:05 +000077 /* The Mixcom cards */
78 {0x0d90, MIXCOM_ID},
79 {0x0e90, MIXCOM_ID},
80 {0x0f90, MIXCOM_ID},
81 /* The FlashCOM cards */
82 {0x0304, FLASHCOM_ID},
83 {0x030c, FLASHCOM_ID},
84 {0x0314, FLASHCOM_ID},
85 {0x031c, FLASHCOM_ID},
86 {0x0324, FLASHCOM_ID},
87 {0x032c, FLASHCOM_ID},
88 {0x0334, FLASHCOM_ID},
89 {0x033c, FLASHCOM_ID},
90 {0x0344, FLASHCOM_ID},
91 {0x034c, FLASHCOM_ID},
92 {0x0354, FLASHCOM_ID},
93 {0x035c, FLASHCOM_ID},
94 {0x0364, FLASHCOM_ID},
95 {0x036c, FLASHCOM_ID},
96 {0x0374, FLASHCOM_ID},
97 {0x037c, FLASHCOM_ID},
98 /* The end of the list */
99 {0x0000, 0},
100};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
Jiri Slaby82eb7c52007-02-08 18:39:36 +0100102static void mixcomwd_timerfun(unsigned long d);
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104static unsigned long mixcomwd_opened; /* long req'd for setbit --RR */
105
106static int watchdog_port;
107static int mixcomwd_timer_alive;
Jiri Slaby82eb7c52007-02-08 18:39:36 +0100108static DEFINE_TIMER(mixcomwd_timer, mixcomwd_timerfun, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109static char expect_close;
110
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +0100111static bool nowayout = WATCHDOG_NOWAYOUT;
112module_param(nowayout, bool, 0);
Alan Cox39309642008-05-19 14:07:04 +0100113MODULE_PARM_DESC(nowayout,
114 "Watchdog cannot be stopped once started (default="
115 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117static void mixcomwd_ping(void)
118{
Alan Cox39309642008-05-19 14:07:04 +0100119 outb_p(55, watchdog_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 return;
121}
122
123static void mixcomwd_timerfun(unsigned long d)
124{
125 mixcomwd_ping();
Jiri Slaby82eb7c52007-02-08 18:39:36 +0100126 mod_timer(&mixcomwd_timer, jiffies + 5 * HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
128
129/*
130 * Allow only one person to hold it open
131 */
132
133static int mixcomwd_open(struct inode *inode, struct file *file)
134{
Alan Cox39309642008-05-19 14:07:04 +0100135 if (test_and_set_bit(0, &mixcomwd_opened))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 return -EBUSY;
Alan Cox39309642008-05-19 14:07:04 +0100137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 mixcomwd_ping();
139
Alan Cox39309642008-05-19 14:07:04 +0100140 if (nowayout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 /*
142 * fops_get() code via open() has already done
143 * a try_module_get() so it is safe to do the
144 * __module_get().
145 */
146 __module_get(THIS_MODULE);
Alan Cox39309642008-05-19 14:07:04 +0100147 else {
148 if (mixcomwd_timer_alive) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 del_timer(&mixcomwd_timer);
Alan Cox39309642008-05-19 14:07:04 +0100150 mixcomwd_timer_alive = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
152 }
153 return nonseekable_open(inode, file);
154}
155
156static int mixcomwd_release(struct inode *inode, struct file *file)
157{
158 if (expect_close == 42) {
Alan Cox39309642008-05-19 14:07:04 +0100159 if (mixcomwd_timer_alive) {
Joe Perches27c766a2012-02-15 15:06:19 -0800160 pr_err("release called while internal timer alive\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 return -EBUSY;
162 }
Alan Cox39309642008-05-19 14:07:04 +0100163 mixcomwd_timer_alive = 1;
Jiri Slaby82eb7c52007-02-08 18:39:36 +0100164 mod_timer(&mixcomwd_timer, jiffies + 5 * HZ);
Alan Cox39309642008-05-19 14:07:04 +0100165 } else
Joe Perches27c766a2012-02-15 15:06:19 -0800166 pr_crit("WDT device closed unexpectedly. WDT will not stop!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Alan Cox39309642008-05-19 14:07:04 +0100168 clear_bit(0, &mixcomwd_opened);
169 expect_close = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return 0;
171}
172
173
Alan Cox39309642008-05-19 14:07:04 +0100174static ssize_t mixcomwd_write(struct file *file, const char __user *data,
175 size_t len, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
Alan Cox39309642008-05-19 14:07:04 +0100177 if (len) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 if (!nowayout) {
179 size_t i;
180
181 /* In case it was set long ago */
182 expect_close = 0;
183
184 for (i = 0; i != len; i++) {
185 char c;
186 if (get_user(c, data + i))
187 return -EFAULT;
188 if (c == 'V')
189 expect_close = 42;
190 }
191 }
192 mixcomwd_ping();
193 }
194 return len;
195}
196
Alan Cox39309642008-05-19 14:07:04 +0100197static long mixcomwd_ioctl(struct file *file,
198 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
200 void __user *argp = (void __user *)arg;
201 int __user *p = argp;
202 int status;
Wim Van Sebroeck42747d72009-12-26 18:55:22 +0000203 static const struct watchdog_info ident = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
205 .firmware_version = 1,
206 .identity = "MixCOM watchdog",
207 };
208
Alan Cox39309642008-05-19 14:07:04 +0100209 switch (cmd) {
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000210 case WDIOC_GETSUPPORT:
211 if (copy_to_user(argp, &ident, sizeof(ident)))
212 return -EFAULT;
213 break;
Alan Cox39309642008-05-19 14:07:04 +0100214 case WDIOC_GETSTATUS:
215 status = mixcomwd_opened;
216 if (!nowayout)
217 status |= mixcomwd_timer_alive;
218 return put_user(status, p);
219 case WDIOC_GETBOOTSTATUS:
220 return put_user(0, p);
Alan Cox39309642008-05-19 14:07:04 +0100221 case WDIOC_KEEPALIVE:
222 mixcomwd_ping();
223 break;
224 default:
225 return -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 }
227 return 0;
228}
229
Wim Van Sebroeck10a29302007-06-04 19:13:28 +0000230static const struct file_operations mixcomwd_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 .owner = THIS_MODULE,
232 .llseek = no_llseek,
233 .write = mixcomwd_write,
Alan Cox39309642008-05-19 14:07:04 +0100234 .unlocked_ioctl = mixcomwd_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 .open = mixcomwd_open,
236 .release = mixcomwd_release,
237};
238
Wim Van Sebroeck10a29302007-06-04 19:13:28 +0000239static struct miscdevice mixcomwd_miscdev = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 .minor = WATCHDOG_MINOR,
241 .name = "watchdog",
242 .fops = &mixcomwd_fops,
243};
244
Wim Van Sebroeck4194db12007-06-03 19:01:38 +0000245static int __init checkcard(int port, int card_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
247 int id;
248
Alan Cox39309642008-05-19 14:07:04 +0100249 if (!request_region(port, 1, "MixCOM watchdog"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Alan Cox39309642008-05-19 14:07:04 +0100252 id = inb_p(port);
253 if (card_id == MIXCOM_ID)
Wim Van Sebroeck4194db12007-06-03 19:01:38 +0000254 id &= 0x3f;
255
Alan Cox39309642008-05-19 14:07:04 +0100256 if (id != card_id) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 release_region(port, 1);
258 return 0;
259 }
Wim Van Sebroeck4194db12007-06-03 19:01:38 +0000260 return 1;
261}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263static int __init mixcomwd_init(void)
264{
Alan Cox39309642008-05-19 14:07:04 +0100265 int i, ret, found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Wim Van Sebroeck21baf3c2007-06-03 20:46:05 +0000267 for (i = 0; !found && mixcomwd_io_info[i].ioport != 0; i++) {
268 if (checkcard(mixcomwd_io_info[i].ioport,
269 mixcomwd_io_info[i].id)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 found = 1;
Wim Van Sebroeck21baf3c2007-06-03 20:46:05 +0000271 watchdog_port = mixcomwd_io_info[i].ioport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273 }
274
275 if (!found) {
Joe Perches27c766a2012-02-15 15:06:19 -0800276 pr_err("No card detected, or port not available\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return -ENODEV;
278 }
279
280 ret = misc_register(&mixcomwd_miscdev);
Alan Cox39309642008-05-19 14:07:04 +0100281 if (ret) {
Joe Perches27c766a2012-02-15 15:06:19 -0800282 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
283 WATCHDOG_MINOR, ret);
Wim Van Sebroeck27c77422007-06-04 18:35:41 +0000284 goto error_misc_register_watchdog;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 }
286
Joe Perches27c766a2012-02-15 15:06:19 -0800287 pr_info("MixCOM watchdog driver v%s, watchdog port at 0x%3x\n",
288 VERSION, watchdog_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290 return 0;
Wim Van Sebroeck27c77422007-06-04 18:35:41 +0000291
292error_misc_register_watchdog:
293 release_region(watchdog_port, 1);
294 watchdog_port = 0x0000;
295 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
298static void __exit mixcomwd_exit(void)
299{
300 if (!nowayout) {
Alan Cox39309642008-05-19 14:07:04 +0100301 if (mixcomwd_timer_alive) {
Joe Perches27c766a2012-02-15 15:06:19 -0800302 pr_warn("I quit now, hardware will probably reboot!\n");
Jiri Slaby82eb7c52007-02-08 18:39:36 +0100303 del_timer_sync(&mixcomwd_timer);
Alan Cox39309642008-05-19 14:07:04 +0100304 mixcomwd_timer_alive = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 }
306 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 misc_deregister(&mixcomwd_miscdev);
Alan Cox39309642008-05-19 14:07:04 +0100308 release_region(watchdog_port, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309}
310
311module_init(mixcomwd_init);
312module_exit(mixcomwd_exit);
313
314MODULE_AUTHOR("Gergely Madarasz <gorgo@itc.hu>");
315MODULE_DESCRIPTION("MixCom Watchdog driver");
Wim Van Sebroeck1c067312007-06-04 18:35:41 +0000316MODULE_VERSION(VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317MODULE_LICENSE("GPL");
318MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);