Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 1 | /* |
Samuel Tardieu | de710d6 | 2006-09-07 11:57:00 +0200 | [diff] [blame^] | 2 | * w83697hf/hg WDT driver |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 3 | * |
| 4 | * (c) Copyright 2006 Marcus Junker <junker@anduras.de> |
| 5 | * |
Samuel Tardieu | de710d6 | 2006-09-07 11:57:00 +0200 | [diff] [blame^] | 6 | * Based on w83627hf_wdt.c which is based on advantechwdt.c |
| 7 | * which is based on wdt.c. |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 8 | * Original copyright messages: |
| 9 | * |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 10 | * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com> |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 11 | * |
| 12 | * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> |
| 13 | * |
| 14 | * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved. |
| 15 | * http://www.redhat.com |
| 16 | * |
| 17 | * This program is free software; you can redistribute it and/or |
| 18 | * modify it under the terms of the GNU General Public License |
| 19 | * as published by the Free Software Foundation; either version |
| 20 | * 2 of the License, or (at your option) any later version. |
| 21 | * |
| 22 | * Neither Marcus Junker nor ANDURAS AG admit liability nor provide |
| 23 | * warranty for any of this software. This material is provided |
| 24 | * "AS-IS" and at no charge. |
| 25 | */ |
| 26 | |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/moduleparam.h> |
| 29 | #include <linux/types.h> |
| 30 | #include <linux/miscdevice.h> |
| 31 | #include <linux/watchdog.h> |
| 32 | #include <linux/fs.h> |
| 33 | #include <linux/ioport.h> |
| 34 | #include <linux/notifier.h> |
| 35 | #include <linux/reboot.h> |
| 36 | #include <linux/init.h> |
Wim Van Sebroeck | ab9d441 | 2006-09-02 18:50:20 +0200 | [diff] [blame] | 37 | #include <linux/spinlock.h> |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 38 | |
| 39 | #include <asm/io.h> |
| 40 | #include <asm/uaccess.h> |
| 41 | #include <asm/system.h> |
| 42 | |
Samuel Tardieu | de710d6 | 2006-09-07 11:57:00 +0200 | [diff] [blame^] | 43 | #define WATCHDOG_NAME "w83697hf/hg WDT" |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 44 | #define PFX WATCHDOG_NAME ": " |
| 45 | #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ |
| 46 | |
| 47 | static unsigned long wdt_is_open; |
| 48 | static char expect_close; |
Wim Van Sebroeck | ab9d441 | 2006-09-02 18:50:20 +0200 | [diff] [blame] | 49 | static spinlock_t io_lock; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 50 | |
| 51 | /* You must set this - there is no sane way to probe for this board. */ |
| 52 | static int wdt_io = 0x2E; |
| 53 | module_param(wdt_io, int, 0); |
| 54 | MODULE_PARM_DESC(wdt_io, "w83697hf WDT io port (default 0x2E)"); |
| 55 | |
| 56 | static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ |
| 57 | module_param(timeout, int, 0); |
Samuel Tardieu | eb64419 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 58 | MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) "."); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 59 | |
| 60 | static int nowayout = WATCHDOG_NOWAYOUT; |
| 61 | module_param(nowayout, int, 0); |
| 62 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); |
| 63 | |
| 64 | /* |
| 65 | * Kernel methods. |
| 66 | */ |
| 67 | |
Samuel Tardieu | 44d7d32 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 68 | #define W83697HF_EFER (wdt_io+0) /* Extended Function Enable Register */ |
| 69 | #define W83697HF_EFIR (wdt_io+0) /* Extended Function Index Register (same as EFER) */ |
| 70 | #define W83697HF_EFDR (wdt_io+1) /* Extended Function Data Register */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 71 | |
| 72 | static void |
| 73 | w83697hf_select_wd_register(void) |
| 74 | { |
Samuel Tardieu | 44d7d32 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 75 | outb_p(0x87, W83697HF_EFER); /* Enter extended function mode */ |
| 76 | outb_p(0x87, W83697HF_EFER); /* Again according to manual */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 77 | |
Samuel Tardieu | 44d7d32 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 78 | outb_p(0x29, W83697HF_EFER); /* select CR29 */ |
| 79 | outb_p(0x20, W83697HF_EFDR); /* select WDTO */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 80 | |
Samuel Tardieu | 44d7d32 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 81 | outb_p(0x07, W83697HF_EFER); /* point to logical device number reg */ |
| 82 | outb_p(0x08, W83697HF_EFDR); /* select logical device 8 (GPIO2) */ |
| 83 | outb_p(0x30, W83697HF_EFER); /* select CR30 */ |
| 84 | outb_p(0x01, W83697HF_EFDR); /* set bit 0 to activate GPIO2 */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | static void |
| 88 | w83697hf_unselect_wd_register(void) |
| 89 | { |
Samuel Tardieu | 44d7d32 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 90 | outb_p(0xAA, W83697HF_EFER); /* Leave extended function mode */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 91 | } |
| 92 | |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 93 | static void |
| 94 | w83697hf_init(void) |
| 95 | { |
| 96 | unsigned char t; |
| 97 | |
| 98 | w83697hf_select_wd_register(); |
| 99 | |
Samuel Tardieu | 44d7d32 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 100 | outb_p(0xF3, W83697HF_EFER); /* Select CRF3 */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 101 | |
Samuel Tardieu | 44d7d32 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 102 | t=inb_p(W83697HF_EFDR); /* read CRF3 */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 103 | if (t != 0) { |
| 104 | printk (KERN_INFO PFX "Watchdog already running. Resetting timeout to %d sec\n", timeout); |
Samuel Tardieu | 44d7d32 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 105 | outb_p(timeout, W83697HF_EFDR); /* Write back to CRF3 */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 106 | } |
Samuel Tardieu | 44d7d32 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 107 | outb_p(0xF4, W83697HF_EFER); /* Select CRF4 */ |
| 108 | t=inb_p(W83697HF_EFDR); /* read CRF4 */ |
| 109 | t&=~0x0C; /* set second mode & disable keyboard turning off watchdog */ |
| 110 | outb_p(t, W83697HF_EFDR); /* Write back to CRF4 */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 111 | |
| 112 | w83697hf_unselect_wd_register(); |
| 113 | } |
| 114 | |
| 115 | static void |
| 116 | wdt_ctrl(int timeout) |
| 117 | { |
Wim Van Sebroeck | ab9d441 | 2006-09-02 18:50:20 +0200 | [diff] [blame] | 118 | spin_lock(&io_lock); |
| 119 | |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 120 | w83697hf_select_wd_register(); |
| 121 | |
Samuel Tardieu | 44d7d32 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 122 | outb_p(0xF4, W83697HF_EFER); /* Select CRF4 */ |
| 123 | outb_p(timeout, W83697HF_EFDR); /* Write Timeout counter to CRF4 */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 124 | |
| 125 | w83697hf_unselect_wd_register(); |
Wim Van Sebroeck | ab9d441 | 2006-09-02 18:50:20 +0200 | [diff] [blame] | 126 | |
| 127 | spin_unlock(&io_lock); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | static int |
| 131 | wdt_ping(void) |
| 132 | { |
| 133 | wdt_ctrl(timeout); |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | static int |
| 138 | wdt_disable(void) |
| 139 | { |
| 140 | wdt_ctrl(0); |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | static int |
| 145 | wdt_set_heartbeat(int t) |
| 146 | { |
Samuel Tardieu | eb64419 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 147 | if ((t < 1) || (t > 255)) |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 148 | return -EINVAL; |
| 149 | |
| 150 | timeout = t; |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | static ssize_t |
| 155 | wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
| 156 | { |
| 157 | if (count) { |
| 158 | if (!nowayout) { |
| 159 | size_t i; |
| 160 | |
| 161 | expect_close = 0; |
| 162 | |
| 163 | for (i = 0; i != count; i++) { |
| 164 | char c; |
| 165 | if (get_user(c, buf+i)) |
| 166 | return -EFAULT; |
| 167 | if (c == 'V') |
| 168 | expect_close = 42; |
| 169 | } |
| 170 | } |
| 171 | wdt_ping(); |
| 172 | } |
| 173 | return count; |
| 174 | } |
| 175 | |
| 176 | static int |
| 177 | wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, |
| 178 | unsigned long arg) |
| 179 | { |
| 180 | void __user *argp = (void __user *)arg; |
| 181 | int __user *p = argp; |
| 182 | int new_timeout; |
| 183 | static struct watchdog_info ident = { |
| 184 | .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, |
| 185 | .firmware_version = 1, |
| 186 | .identity = "W83697HF WDT", |
| 187 | }; |
| 188 | |
| 189 | switch (cmd) { |
| 190 | case WDIOC_GETSUPPORT: |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 191 | if (copy_to_user(argp, &ident, sizeof(ident))) |
| 192 | return -EFAULT; |
| 193 | break; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 194 | |
| 195 | case WDIOC_GETSTATUS: |
| 196 | case WDIOC_GETBOOTSTATUS: |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 197 | return put_user(0, p); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 198 | |
| 199 | case WDIOC_KEEPALIVE: |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 200 | wdt_ping(); |
| 201 | break; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 202 | |
| 203 | case WDIOC_SETTIMEOUT: |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 204 | if (get_user(new_timeout, p)) |
| 205 | return -EFAULT; |
| 206 | if (wdt_set_heartbeat(new_timeout)) |
| 207 | return -EINVAL; |
| 208 | wdt_ping(); |
| 209 | /* Fall */ |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 210 | |
| 211 | case WDIOC_GETTIMEOUT: |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 212 | return put_user(timeout, p); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 213 | |
| 214 | case WDIOC_SETOPTIONS: |
| 215 | { |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 216 | int options, retval = -EINVAL; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 217 | |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 218 | if (get_user(options, p)) |
| 219 | return -EFAULT; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 220 | |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 221 | if (options & WDIOS_DISABLECARD) { |
| 222 | wdt_disable(); |
| 223 | retval = 0; |
| 224 | } |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 225 | |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 226 | if (options & WDIOS_ENABLECARD) { |
| 227 | wdt_ping(); |
| 228 | retval = 0; |
| 229 | } |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 230 | |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 231 | return retval; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | default: |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 235 | return -ENOTTY; |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 236 | } |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | static int |
| 241 | wdt_open(struct inode *inode, struct file *file) |
| 242 | { |
| 243 | if (test_and_set_bit(0, &wdt_is_open)) |
| 244 | return -EBUSY; |
| 245 | /* |
| 246 | * Activate |
| 247 | */ |
| 248 | |
| 249 | wdt_ping(); |
| 250 | return nonseekable_open(inode, file); |
| 251 | } |
| 252 | |
| 253 | static int |
| 254 | wdt_close(struct inode *inode, struct file *file) |
| 255 | { |
| 256 | if (expect_close == 42) { |
| 257 | wdt_disable(); |
| 258 | } else { |
Samuel Tardieu | db16525 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 259 | printk (KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 260 | wdt_ping(); |
| 261 | } |
| 262 | expect_close = 0; |
| 263 | clear_bit(0, &wdt_is_open); |
| 264 | return 0; |
| 265 | } |
| 266 | |
| 267 | /* |
| 268 | * Notifier for system down |
| 269 | */ |
| 270 | |
| 271 | static int |
| 272 | wdt_notify_sys(struct notifier_block *this, unsigned long code, |
| 273 | void *unused) |
| 274 | { |
| 275 | if (code == SYS_DOWN || code == SYS_HALT) { |
| 276 | /* Turn the WDT off */ |
| 277 | wdt_disable(); |
| 278 | } |
| 279 | return NOTIFY_DONE; |
| 280 | } |
| 281 | |
| 282 | /* |
| 283 | * Kernel Interfaces |
| 284 | */ |
| 285 | |
| 286 | static struct file_operations wdt_fops = { |
| 287 | .owner = THIS_MODULE, |
| 288 | .llseek = no_llseek, |
| 289 | .write = wdt_write, |
| 290 | .ioctl = wdt_ioctl, |
| 291 | .open = wdt_open, |
| 292 | .release = wdt_close, |
| 293 | }; |
| 294 | |
| 295 | static struct miscdevice wdt_miscdev = { |
| 296 | .minor = WATCHDOG_MINOR, |
| 297 | .name = "watchdog", |
| 298 | .fops = &wdt_fops, |
| 299 | }; |
| 300 | |
| 301 | /* |
| 302 | * The WDT needs to learn about soft shutdowns in order to |
| 303 | * turn the timebomb registers off. |
| 304 | */ |
| 305 | |
| 306 | static struct notifier_block wdt_notifier = { |
| 307 | .notifier_call = wdt_notify_sys, |
| 308 | }; |
| 309 | |
| 310 | static int __init |
| 311 | wdt_init(void) |
| 312 | { |
| 313 | int ret; |
| 314 | |
Wim Van Sebroeck | ab9d441 | 2006-09-02 18:50:20 +0200 | [diff] [blame] | 315 | spin_lock_init(&io_lock); |
| 316 | |
Samuel Tardieu | de710d6 | 2006-09-07 11:57:00 +0200 | [diff] [blame^] | 317 | printk (KERN_INFO PFX "WDT driver for W83697HF/HG initializing\n"); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 318 | |
| 319 | if (wdt_set_heartbeat(timeout)) { |
| 320 | wdt_set_heartbeat(WATCHDOG_TIMEOUT); |
Samuel Tardieu | eb64419 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 321 | printk (KERN_INFO PFX "timeout value must be 1<=timeout<=255, using %d\n", |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 322 | WATCHDOG_TIMEOUT); |
| 323 | } |
| 324 | |
Samuel Tardieu | b41a9f5 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 325 | if (!request_region(wdt_io, 2, WATCHDOG_NAME)) { |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 326 | printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", |
| 327 | wdt_io); |
| 328 | ret = -EIO; |
| 329 | goto out; |
| 330 | } |
| 331 | |
| 332 | w83697hf_init(); |
| 333 | |
| 334 | ret = register_reboot_notifier(&wdt_notifier); |
| 335 | if (ret != 0) { |
| 336 | printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", |
| 337 | ret); |
| 338 | goto unreg_regions; |
| 339 | } |
| 340 | |
| 341 | ret = misc_register(&wdt_miscdev); |
| 342 | if (ret != 0) { |
| 343 | printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", |
| 344 | WATCHDOG_MINOR, ret); |
| 345 | goto unreg_reboot; |
| 346 | } |
| 347 | |
| 348 | printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n", |
| 349 | timeout, nowayout); |
| 350 | |
| 351 | out: |
| 352 | return ret; |
| 353 | unreg_reboot: |
| 354 | unregister_reboot_notifier(&wdt_notifier); |
| 355 | unreg_regions: |
Samuel Tardieu | b41a9f5 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 356 | release_region(wdt_io, 2); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 357 | goto out; |
| 358 | } |
| 359 | |
| 360 | static void __exit |
| 361 | wdt_exit(void) |
| 362 | { |
| 363 | misc_deregister(&wdt_miscdev); |
| 364 | unregister_reboot_notifier(&wdt_notifier); |
Samuel Tardieu | b41a9f5 | 2006-09-07 11:57:00 +0200 | [diff] [blame] | 365 | release_region(wdt_io, 2); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | module_init(wdt_init); |
| 369 | module_exit(wdt_exit); |
| 370 | |
| 371 | MODULE_LICENSE("GPL"); |
| 372 | MODULE_AUTHOR("Marcus Junker <junker@anduras.de>"); |
Samuel Tardieu | de710d6 | 2006-09-07 11:57:00 +0200 | [diff] [blame^] | 373 | MODULE_DESCRIPTION("w83697hf/hg WDT driver"); |
Marcus Junker | f9a8c89 | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 374 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |