1b7e04f8cSWim Van Sebroeck /* 2b7e04f8cSWim Van Sebroeck * MixCom Watchdog: A Simple Hardware Watchdog Device 3b7e04f8cSWim Van Sebroeck * Based on Softdog driver by Alan Cox and PC Watchdog driver by Ken Hollis 4b7e04f8cSWim Van Sebroeck * 5b7e04f8cSWim Van Sebroeck * Author: Gergely Madarasz <gorgo@itc.hu> 6b7e04f8cSWim Van Sebroeck * 7b7e04f8cSWim Van Sebroeck * Copyright (c) 1999 ITConsult-Pro Co. <info@itc.hu> 8b7e04f8cSWim Van Sebroeck * 9b7e04f8cSWim Van Sebroeck * This program is free software; you can redistribute it and/or 10b7e04f8cSWim Van Sebroeck * modify it under the terms of the GNU General Public License 11b7e04f8cSWim Van Sebroeck * as published by the Free Software Foundation; either version 12b7e04f8cSWim Van Sebroeck * 2 of the License, or (at your option) any later version. 13b7e04f8cSWim Van Sebroeck * 14b7e04f8cSWim Van Sebroeck * Version 0.1 (99/04/15): 15b7e04f8cSWim Van Sebroeck * - first version 16b7e04f8cSWim Van Sebroeck * 17b7e04f8cSWim Van Sebroeck * Version 0.2 (99/06/16): 18b7e04f8cSWim Van Sebroeck * - added kernel timer watchdog ping after close 19b7e04f8cSWim Van Sebroeck * since the hardware does not support watchdog shutdown 20b7e04f8cSWim Van Sebroeck * 21b7e04f8cSWim Van Sebroeck * Version 0.3 (99/06/21): 22b7e04f8cSWim Van Sebroeck * - added WDIOC_GETSTATUS and WDIOC_GETSUPPORT ioctl calls 23b7e04f8cSWim Van Sebroeck * 24b7e04f8cSWim Van Sebroeck * Version 0.3.1 (99/06/22): 25b7e04f8cSWim Van Sebroeck * - allow module removal while internal timer is active, 26b7e04f8cSWim Van Sebroeck * print warning about probable reset 27b7e04f8cSWim Van Sebroeck * 28b7e04f8cSWim Van Sebroeck * Version 0.4 (99/11/15): 29b7e04f8cSWim Van Sebroeck * - support for one more type board 30b7e04f8cSWim Van Sebroeck * 31b7e04f8cSWim Van Sebroeck * Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com> 3239309645SAlan Cox * - added nowayout module option to override 3339309645SAlan Cox * CONFIG_WATCHDOG_NOWAYOUT 34b7e04f8cSWim Van Sebroeck * 35b7e04f8cSWim Van Sebroeck * Version 0.6 (2002/04/12): Rob Radez <rob@osinvestor.com> 36b7e04f8cSWim Van Sebroeck * - make mixcomwd_opened unsigned, 37b7e04f8cSWim Van Sebroeck * removed lock_kernel/unlock_kernel from mixcomwd_release, 38b7e04f8cSWim Van Sebroeck * modified ioctl a bit to conform to API 39b7e04f8cSWim Van Sebroeck * 40b7e04f8cSWim Van Sebroeck */ 41b7e04f8cSWim Van Sebroeck 42b7e04f8cSWim Van Sebroeck #define VERSION "0.6" 43b7e04f8cSWim Van Sebroeck #define WATCHDOG_NAME "mixcomwd" 44b7e04f8cSWim Van Sebroeck #define PFX WATCHDOG_NAME ": " 45b7e04f8cSWim Van Sebroeck 46b7e04f8cSWim Van Sebroeck #include <linux/module.h> 47b7e04f8cSWim Van Sebroeck #include <linux/moduleparam.h> 48b7e04f8cSWim Van Sebroeck #include <linux/types.h> 49b7e04f8cSWim Van Sebroeck #include <linux/miscdevice.h> 50b7e04f8cSWim Van Sebroeck #include <linux/ioport.h> 51b7e04f8cSWim Van Sebroeck #include <linux/watchdog.h> 52b7e04f8cSWim Van Sebroeck #include <linux/fs.h> 53b7e04f8cSWim Van Sebroeck #include <linux/reboot.h> 54b7e04f8cSWim Van Sebroeck #include <linux/init.h> 55b7e04f8cSWim Van Sebroeck #include <linux/jiffies.h> 56b7e04f8cSWim Van Sebroeck #include <linux/timer.h> 5739309645SAlan Cox #include <linux/uaccess.h> 5839309645SAlan Cox #include <linux/io.h> 59b7e04f8cSWim Van Sebroeck 60b7e04f8cSWim Van Sebroeck /* 61b7e04f8cSWim Van Sebroeck * We have two types of cards that can be probed: 62b7e04f8cSWim Van Sebroeck * 1) The Mixcom cards: these cards can be found at addresses 63b7e04f8cSWim Van Sebroeck * 0x180, 0x280, 0x380 with an additional offset of 0xc10. 64b7e04f8cSWim Van Sebroeck * (Or 0xd90, 0xe90, 0xf90). 65b7e04f8cSWim Van Sebroeck * 2) The FlashCOM cards: these cards can be set up at 66b7e04f8cSWim Van Sebroeck * 0x300 -> 0x378, in 0x8 jumps with an offset of 0x04. 67b7e04f8cSWim Van Sebroeck * (Or 0x304 -> 0x37c in 0x8 jumps). 68b7e04f8cSWim Van Sebroeck * Each card has it's own ID. 69b7e04f8cSWim Van Sebroeck */ 70b7e04f8cSWim Van Sebroeck #define MIXCOM_ID 0x11 71b7e04f8cSWim Van Sebroeck #define FLASHCOM_ID 0x18 72b7e04f8cSWim Van Sebroeck static struct { 73b7e04f8cSWim Van Sebroeck int ioport; 74b7e04f8cSWim Van Sebroeck int id; 75b7e04f8cSWim Van Sebroeck } mixcomwd_io_info[] __devinitdata = { 76b7e04f8cSWim Van Sebroeck /* The Mixcom cards */ 77b7e04f8cSWim Van Sebroeck {0x0d90, MIXCOM_ID}, 78b7e04f8cSWim Van Sebroeck {0x0e90, MIXCOM_ID}, 79b7e04f8cSWim Van Sebroeck {0x0f90, MIXCOM_ID}, 80b7e04f8cSWim Van Sebroeck /* The FlashCOM cards */ 81b7e04f8cSWim Van Sebroeck {0x0304, FLASHCOM_ID}, 82b7e04f8cSWim Van Sebroeck {0x030c, FLASHCOM_ID}, 83b7e04f8cSWim Van Sebroeck {0x0314, FLASHCOM_ID}, 84b7e04f8cSWim Van Sebroeck {0x031c, FLASHCOM_ID}, 85b7e04f8cSWim Van Sebroeck {0x0324, FLASHCOM_ID}, 86b7e04f8cSWim Van Sebroeck {0x032c, FLASHCOM_ID}, 87b7e04f8cSWim Van Sebroeck {0x0334, FLASHCOM_ID}, 88b7e04f8cSWim Van Sebroeck {0x033c, FLASHCOM_ID}, 89b7e04f8cSWim Van Sebroeck {0x0344, FLASHCOM_ID}, 90b7e04f8cSWim Van Sebroeck {0x034c, FLASHCOM_ID}, 91b7e04f8cSWim Van Sebroeck {0x0354, FLASHCOM_ID}, 92b7e04f8cSWim Van Sebroeck {0x035c, FLASHCOM_ID}, 93b7e04f8cSWim Van Sebroeck {0x0364, FLASHCOM_ID}, 94b7e04f8cSWim Van Sebroeck {0x036c, FLASHCOM_ID}, 95b7e04f8cSWim Van Sebroeck {0x0374, FLASHCOM_ID}, 96b7e04f8cSWim Van Sebroeck {0x037c, FLASHCOM_ID}, 97b7e04f8cSWim Van Sebroeck /* The end of the list */ 98b7e04f8cSWim Van Sebroeck {0x0000, 0}, 99b7e04f8cSWim Van Sebroeck }; 100b7e04f8cSWim Van Sebroeck 101b7e04f8cSWim Van Sebroeck static void mixcomwd_timerfun(unsigned long d); 102b7e04f8cSWim Van Sebroeck 103b7e04f8cSWim Van Sebroeck static unsigned long mixcomwd_opened; /* long req'd for setbit --RR */ 104b7e04f8cSWim Van Sebroeck 105b7e04f8cSWim Van Sebroeck static int watchdog_port; 106b7e04f8cSWim Van Sebroeck static int mixcomwd_timer_alive; 107b7e04f8cSWim Van Sebroeck static DEFINE_TIMER(mixcomwd_timer, mixcomwd_timerfun, 0, 0); 108b7e04f8cSWim Van Sebroeck static char expect_close; 109b7e04f8cSWim Van Sebroeck 110b7e04f8cSWim Van Sebroeck static int nowayout = WATCHDOG_NOWAYOUT; 111b7e04f8cSWim Van Sebroeck module_param(nowayout, int, 0); 11239309645SAlan Cox MODULE_PARM_DESC(nowayout, 11339309645SAlan Cox "Watchdog cannot be stopped once started (default=" 11439309645SAlan Cox __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 115b7e04f8cSWim Van Sebroeck 116b7e04f8cSWim Van Sebroeck static void mixcomwd_ping(void) 117b7e04f8cSWim Van Sebroeck { 118b7e04f8cSWim Van Sebroeck outb_p(55, watchdog_port); 119b7e04f8cSWim Van Sebroeck return; 120b7e04f8cSWim Van Sebroeck } 121b7e04f8cSWim Van Sebroeck 122b7e04f8cSWim Van Sebroeck static void mixcomwd_timerfun(unsigned long d) 123b7e04f8cSWim Van Sebroeck { 124b7e04f8cSWim Van Sebroeck mixcomwd_ping(); 125b7e04f8cSWim Van Sebroeck mod_timer(&mixcomwd_timer, jiffies + 5 * HZ); 126b7e04f8cSWim Van Sebroeck } 127b7e04f8cSWim Van Sebroeck 128b7e04f8cSWim Van Sebroeck /* 129b7e04f8cSWim Van Sebroeck * Allow only one person to hold it open 130b7e04f8cSWim Van Sebroeck */ 131b7e04f8cSWim Van Sebroeck 132b7e04f8cSWim Van Sebroeck static int mixcomwd_open(struct inode *inode, struct file *file) 133b7e04f8cSWim Van Sebroeck { 13439309645SAlan Cox if (test_and_set_bit(0, &mixcomwd_opened)) 135b7e04f8cSWim Van Sebroeck return -EBUSY; 13639309645SAlan Cox 137b7e04f8cSWim Van Sebroeck mixcomwd_ping(); 138b7e04f8cSWim Van Sebroeck 13939309645SAlan Cox if (nowayout) 140b7e04f8cSWim Van Sebroeck /* 141b7e04f8cSWim Van Sebroeck * fops_get() code via open() has already done 142b7e04f8cSWim Van Sebroeck * a try_module_get() so it is safe to do the 143b7e04f8cSWim Van Sebroeck * __module_get(). 144b7e04f8cSWim Van Sebroeck */ 145b7e04f8cSWim Van Sebroeck __module_get(THIS_MODULE); 14639309645SAlan Cox else { 147b7e04f8cSWim Van Sebroeck if (mixcomwd_timer_alive) { 148b7e04f8cSWim Van Sebroeck del_timer(&mixcomwd_timer); 149b7e04f8cSWim Van Sebroeck mixcomwd_timer_alive = 0; 150b7e04f8cSWim Van Sebroeck } 151b7e04f8cSWim Van Sebroeck } 152b7e04f8cSWim Van Sebroeck return nonseekable_open(inode, file); 153b7e04f8cSWim Van Sebroeck } 154b7e04f8cSWim Van Sebroeck 155b7e04f8cSWim Van Sebroeck static int mixcomwd_release(struct inode *inode, struct file *file) 156b7e04f8cSWim Van Sebroeck { 157b7e04f8cSWim Van Sebroeck if (expect_close == 42) { 158b7e04f8cSWim Van Sebroeck if (mixcomwd_timer_alive) { 15939309645SAlan Cox printk(KERN_ERR PFX 16039309645SAlan Cox "release called while internal timer alive"); 161b7e04f8cSWim Van Sebroeck return -EBUSY; 162b7e04f8cSWim Van Sebroeck } 163b7e04f8cSWim Van Sebroeck mixcomwd_timer_alive = 1; 164b7e04f8cSWim Van Sebroeck mod_timer(&mixcomwd_timer, jiffies + 5 * HZ); 16539309645SAlan Cox } else 16639309645SAlan Cox printk(KERN_CRIT PFX 16739309645SAlan Cox "WDT device closed unexpectedly. WDT will not stop!\n"); 168b7e04f8cSWim Van Sebroeck 169b7e04f8cSWim Van Sebroeck clear_bit(0, &mixcomwd_opened); 170b7e04f8cSWim Van Sebroeck expect_close = 0; 171b7e04f8cSWim Van Sebroeck return 0; 172b7e04f8cSWim Van Sebroeck } 173b7e04f8cSWim Van Sebroeck 174b7e04f8cSWim Van Sebroeck 17539309645SAlan Cox static ssize_t mixcomwd_write(struct file *file, const char __user *data, 17639309645SAlan Cox size_t len, loff_t *ppos) 177b7e04f8cSWim Van Sebroeck { 17839309645SAlan Cox if (len) { 179b7e04f8cSWim Van Sebroeck if (!nowayout) { 180b7e04f8cSWim Van Sebroeck size_t i; 181b7e04f8cSWim Van Sebroeck 182b7e04f8cSWim Van Sebroeck /* In case it was set long ago */ 183b7e04f8cSWim Van Sebroeck expect_close = 0; 184b7e04f8cSWim Van Sebroeck 185b7e04f8cSWim Van Sebroeck for (i = 0; i != len; i++) { 186b7e04f8cSWim Van Sebroeck char c; 187b7e04f8cSWim Van Sebroeck if (get_user(c, data + i)) 188b7e04f8cSWim Van Sebroeck return -EFAULT; 189b7e04f8cSWim Van Sebroeck if (c == 'V') 190b7e04f8cSWim Van Sebroeck expect_close = 42; 191b7e04f8cSWim Van Sebroeck } 192b7e04f8cSWim Van Sebroeck } 193b7e04f8cSWim Van Sebroeck mixcomwd_ping(); 194b7e04f8cSWim Van Sebroeck } 195b7e04f8cSWim Van Sebroeck return len; 196b7e04f8cSWim Van Sebroeck } 197b7e04f8cSWim Van Sebroeck 19839309645SAlan Cox static long mixcomwd_ioctl(struct file *file, 199b7e04f8cSWim Van Sebroeck unsigned int cmd, unsigned long arg) 200b7e04f8cSWim Van Sebroeck { 201b7e04f8cSWim Van Sebroeck void __user *argp = (void __user *)arg; 202b7e04f8cSWim Van Sebroeck int __user *p = argp; 203b7e04f8cSWim Van Sebroeck int status; 20442747d71SWim Van Sebroeck static const struct watchdog_info ident = { 205b7e04f8cSWim Van Sebroeck .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, 206b7e04f8cSWim Van Sebroeck .firmware_version = 1, 207b7e04f8cSWim Van Sebroeck .identity = "MixCOM watchdog", 208b7e04f8cSWim Van Sebroeck }; 209b7e04f8cSWim Van Sebroeck 21039309645SAlan Cox switch (cmd) { 2110c06090cSWim Van Sebroeck case WDIOC_GETSUPPORT: 2120c06090cSWim Van Sebroeck if (copy_to_user(argp, &ident, sizeof(ident))) 2130c06090cSWim Van Sebroeck return -EFAULT; 2140c06090cSWim Van Sebroeck break; 215b7e04f8cSWim Van Sebroeck case WDIOC_GETSTATUS: 216b7e04f8cSWim Van Sebroeck status = mixcomwd_opened; 21739309645SAlan Cox if (!nowayout) 218b7e04f8cSWim Van Sebroeck status |= mixcomwd_timer_alive; 21939309645SAlan Cox return put_user(status, p); 220b7e04f8cSWim Van Sebroeck case WDIOC_GETBOOTSTATUS: 22139309645SAlan Cox return put_user(0, p); 222b7e04f8cSWim Van Sebroeck case WDIOC_KEEPALIVE: 223b7e04f8cSWim Van Sebroeck mixcomwd_ping(); 224b7e04f8cSWim Van Sebroeck break; 225b7e04f8cSWim Van Sebroeck default: 226b7e04f8cSWim Van Sebroeck return -ENOTTY; 227b7e04f8cSWim Van Sebroeck } 228b7e04f8cSWim Van Sebroeck return 0; 229b7e04f8cSWim Van Sebroeck } 230b7e04f8cSWim Van Sebroeck 231b7e04f8cSWim Van Sebroeck static const struct file_operations mixcomwd_fops = { 232b7e04f8cSWim Van Sebroeck .owner = THIS_MODULE, 233b7e04f8cSWim Van Sebroeck .llseek = no_llseek, 234b7e04f8cSWim Van Sebroeck .write = mixcomwd_write, 23539309645SAlan Cox .unlocked_ioctl = mixcomwd_ioctl, 236b7e04f8cSWim Van Sebroeck .open = mixcomwd_open, 237b7e04f8cSWim Van Sebroeck .release = mixcomwd_release, 238b7e04f8cSWim Van Sebroeck }; 239b7e04f8cSWim Van Sebroeck 240b7e04f8cSWim Van Sebroeck static struct miscdevice mixcomwd_miscdev = { 241b7e04f8cSWim Van Sebroeck .minor = WATCHDOG_MINOR, 242b7e04f8cSWim Van Sebroeck .name = "watchdog", 243b7e04f8cSWim Van Sebroeck .fops = &mixcomwd_fops, 244b7e04f8cSWim Van Sebroeck }; 245b7e04f8cSWim Van Sebroeck 246b7e04f8cSWim Van Sebroeck static int __init checkcard(int port, int card_id) 247b7e04f8cSWim Van Sebroeck { 248b7e04f8cSWim Van Sebroeck int id; 249b7e04f8cSWim Van Sebroeck 25039309645SAlan Cox if (!request_region(port, 1, "MixCOM watchdog")) 251b7e04f8cSWim Van Sebroeck return 0; 252b7e04f8cSWim Van Sebroeck 253b7e04f8cSWim Van Sebroeck id = inb_p(port); 254b7e04f8cSWim Van Sebroeck if (card_id == MIXCOM_ID) 255b7e04f8cSWim Van Sebroeck id &= 0x3f; 256b7e04f8cSWim Van Sebroeck 257b7e04f8cSWim Van Sebroeck if (id != card_id) { 258b7e04f8cSWim Van Sebroeck release_region(port, 1); 259b7e04f8cSWim Van Sebroeck return 0; 260b7e04f8cSWim Van Sebroeck } 261b7e04f8cSWim Van Sebroeck return 1; 262b7e04f8cSWim Van Sebroeck } 263b7e04f8cSWim Van Sebroeck 264b7e04f8cSWim Van Sebroeck static int __init mixcomwd_init(void) 265b7e04f8cSWim Van Sebroeck { 26639309645SAlan Cox int i, ret, found = 0; 267b7e04f8cSWim Van Sebroeck 268b7e04f8cSWim Van Sebroeck for (i = 0; !found && mixcomwd_io_info[i].ioport != 0; i++) { 269b7e04f8cSWim Van Sebroeck if (checkcard(mixcomwd_io_info[i].ioport, 270b7e04f8cSWim Van Sebroeck mixcomwd_io_info[i].id)) { 271b7e04f8cSWim Van Sebroeck found = 1; 272b7e04f8cSWim Van Sebroeck watchdog_port = mixcomwd_io_info[i].ioport; 273b7e04f8cSWim Van Sebroeck } 274b7e04f8cSWim Van Sebroeck } 275b7e04f8cSWim Van Sebroeck 276b7e04f8cSWim Van Sebroeck if (!found) { 27739309645SAlan Cox printk(KERN_ERR PFX 27839309645SAlan Cox "No card detected, or port not available.\n"); 279b7e04f8cSWim Van Sebroeck return -ENODEV; 280b7e04f8cSWim Van Sebroeck } 281b7e04f8cSWim Van Sebroeck 282b7e04f8cSWim Van Sebroeck ret = misc_register(&mixcomwd_miscdev); 28339309645SAlan Cox if (ret) { 28439309645SAlan Cox printk(KERN_ERR PFX 28539309645SAlan Cox "cannot register miscdev on minor=%d (err=%d)\n", 286b7e04f8cSWim Van Sebroeck WATCHDOG_MINOR, ret); 287b7e04f8cSWim Van Sebroeck goto error_misc_register_watchdog; 288b7e04f8cSWim Van Sebroeck } 289b7e04f8cSWim Van Sebroeck 29039309645SAlan Cox printk(KERN_INFO 29139309645SAlan Cox "MixCOM watchdog driver v%s, watchdog port at 0x%3x\n", 292b7e04f8cSWim Van Sebroeck VERSION, watchdog_port); 293b7e04f8cSWim Van Sebroeck 294b7e04f8cSWim Van Sebroeck return 0; 295b7e04f8cSWim Van Sebroeck 296b7e04f8cSWim Van Sebroeck error_misc_register_watchdog: 297b7e04f8cSWim Van Sebroeck release_region(watchdog_port, 1); 298b7e04f8cSWim Van Sebroeck watchdog_port = 0x0000; 299b7e04f8cSWim Van Sebroeck return ret; 300b7e04f8cSWim Van Sebroeck } 301b7e04f8cSWim Van Sebroeck 302b7e04f8cSWim Van Sebroeck static void __exit mixcomwd_exit(void) 303b7e04f8cSWim Van Sebroeck { 304b7e04f8cSWim Van Sebroeck if (!nowayout) { 305b7e04f8cSWim Van Sebroeck if (mixcomwd_timer_alive) { 306b7e04f8cSWim Van Sebroeck printk(KERN_WARNING PFX "I quit now, hardware will" 307b7e04f8cSWim Van Sebroeck " probably reboot!\n"); 308b7e04f8cSWim Van Sebroeck del_timer_sync(&mixcomwd_timer); 309b7e04f8cSWim Van Sebroeck mixcomwd_timer_alive = 0; 310b7e04f8cSWim Van Sebroeck } 311b7e04f8cSWim Van Sebroeck } 312b7e04f8cSWim Van Sebroeck misc_deregister(&mixcomwd_miscdev); 313b7e04f8cSWim Van Sebroeck release_region(watchdog_port, 1); 314b7e04f8cSWim Van Sebroeck } 315b7e04f8cSWim Van Sebroeck 316b7e04f8cSWim Van Sebroeck module_init(mixcomwd_init); 317b7e04f8cSWim Van Sebroeck module_exit(mixcomwd_exit); 318b7e04f8cSWim Van Sebroeck 319b7e04f8cSWim Van Sebroeck MODULE_AUTHOR("Gergely Madarasz <gorgo@itc.hu>"); 320b7e04f8cSWim Van Sebroeck MODULE_DESCRIPTION("MixCom Watchdog driver"); 321b7e04f8cSWim Van Sebroeck MODULE_VERSION(VERSION); 322b7e04f8cSWim Van Sebroeck MODULE_LICENSE("GPL"); 323b7e04f8cSWim Van Sebroeck MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); 324