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ALSA: sound/core/pcm_timer.c: use lib/gcd.c
[linux-2.6.git] / drivers / watchdog / iTCO_wdt.c
blobe44fbb31bc6faa1a24582475b4ee82b64a4f1339
1 /*
2 * intel TCO Watchdog Driver
3 *
4 * (c) Copyright 2006-2009 Wim Van Sebroeck <wim@iguana.be>.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
12 * provide warranty for any of this software. This material is
13 * provided "AS-IS" and at no charge.
14 *
15 * The TCO watchdog is implemented in the following I/O controller hubs:
16 * (See the intel documentation on http://developer.intel.com.)
17 * document number 290655-003, 290677-014: 82801AA (ICH), 82801AB (ICHO)
18 * document number 290687-002, 298242-027: 82801BA (ICH2)
19 * document number 290733-003, 290739-013: 82801CA (ICH3-S)
20 * document number 290716-001, 290718-007: 82801CAM (ICH3-M)
21 * document number 290744-001, 290745-025: 82801DB (ICH4)
22 * document number 252337-001, 252663-008: 82801DBM (ICH4-M)
23 * document number 273599-001, 273645-002: 82801E (C-ICH)
24 * document number 252516-001, 252517-028: 82801EB (ICH5), 82801ER (ICH5R)
25 * document number 300641-004, 300884-013: 6300ESB
26 * document number 301473-002, 301474-026: 82801F (ICH6)
27 * document number 313082-001, 313075-006: 631xESB, 632xESB
28 * document number 307013-003, 307014-024: 82801G (ICH7)
29 * document number 313056-003, 313057-017: 82801H (ICH8)
30 * document number 316972-004, 316973-012: 82801I (ICH9)
31 * document number 319973-002, 319974-002: 82801J (ICH10)
32 * document number 322169-001, 322170-001: 5 Series, 3400 Series (PCH)
33 */
34
35 /*
36 * Includes, defines, variables, module parameters, ...
37 */
38
39 /* Module and version information */
40 #define DRV_NAME "iTCO_wdt"
41 #define DRV_VERSION "1.05"
42 #define PFX DRV_NAME ": "
43
44 /* Includes */
45 #include <linux/module.h> /* For module specific items */
46 #include <linux/moduleparam.h> /* For new moduleparam's */
47 #include <linux/types.h> /* For standard types (like size_t) */
48 #include <linux/errno.h> /* For the -ENODEV/... values */
49 #include <linux/kernel.h> /* For printk/panic/... */
50 #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
51 (WATCHDOG_MINOR) */
52 #include <linux/watchdog.h> /* For the watchdog specific items */
53 #include <linux/init.h> /* For __init/__exit/... */
54 #include <linux/fs.h> /* For file operations */
55 #include <linux/platform_device.h> /* For platform_driver framework */
56 #include <linux/pci.h> /* For pci functions */
57 #include <linux/ioport.h> /* For io-port access */
58 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
59 #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
60 #include <linux/io.h> /* For inb/outb/... */
61
62 #include "iTCO_vendor.h"
63
64 /* TCO related info */
65 enum iTCO_chipsets {
66 TCO_ICH = 0, /* ICH */
67 TCO_ICH0, /* ICH0 */
68 TCO_ICH2, /* ICH2 */
69 TCO_ICH2M, /* ICH2-M */
70 TCO_ICH3, /* ICH3-S */
71 TCO_ICH3M, /* ICH3-M */
72 TCO_ICH4, /* ICH4 */
73 TCO_ICH4M, /* ICH4-M */
74 TCO_CICH, /* C-ICH */
75 TCO_ICH5, /* ICH5 & ICH5R */
76 TCO_6300ESB, /* 6300ESB */
77 TCO_ICH6, /* ICH6 & ICH6R */
78 TCO_ICH6M, /* ICH6-M */
79 TCO_ICH6W, /* ICH6W & ICH6RW */
80 TCO_631XESB, /* 631xESB/632xESB */
81 TCO_ICH7, /* ICH7 & ICH7R */
82 TCO_ICH7DH, /* ICH7DH */
83 TCO_ICH7M, /* ICH7-M & ICH7-U */
84 TCO_ICH7MDH, /* ICH7-M DH */
85 TCO_ICH8, /* ICH8 & ICH8R */
86 TCO_ICH8DH, /* ICH8DH */
87 TCO_ICH8DO, /* ICH8DO */
88 TCO_ICH8M, /* ICH8M */
89 TCO_ICH8ME, /* ICH8M-E */
90 TCO_ICH9, /* ICH9 */
91 TCO_ICH9R, /* ICH9R */
92 TCO_ICH9DH, /* ICH9DH */
93 TCO_ICH9DO, /* ICH9DO */
94 TCO_ICH9M, /* ICH9M */
95 TCO_ICH9ME, /* ICH9M-E */
96 TCO_ICH10, /* ICH10 */
97 TCO_ICH10R, /* ICH10R */
98 TCO_ICH10D, /* ICH10D */
99 TCO_ICH10DO, /* ICH10DO */
100 TCO_PCH, /* PCH Desktop Full Featured */
101 TCO_PCHM, /* PCH Mobile Full Featured */
102 TCO_PCHMSFF, /* PCH Mobile SFF Full Featured */
103 };
104
105 static struct {
106 char *name;
107 unsigned int iTCO_version;
108 } iTCO_chipset_info[] __devinitdata = {
109 {"ICH", 1},
110 {"ICH0", 1},
111 {"ICH2", 1},
112 {"ICH2-M", 1},
113 {"ICH3-S", 1},
114 {"ICH3-M", 1},
115 {"ICH4", 1},
116 {"ICH4-M", 1},
117 {"C-ICH", 1},
118 {"ICH5 or ICH5R", 1},
119 {"6300ESB", 1},
120 {"ICH6 or ICH6R", 2},
121 {"ICH6-M", 2},
122 {"ICH6W or ICH6RW", 2},
123 {"631xESB/632xESB", 2},
124 {"ICH7 or ICH7R", 2},
125 {"ICH7DH", 2},
126 {"ICH7-M or ICH7-U", 2},
127 {"ICH7-M DH", 2},
128 {"ICH8 or ICH8R", 2},
129 {"ICH8DH", 2},
130 {"ICH8DO", 2},
131 {"ICH8M", 2},
132 {"ICH8M-E", 2},
133 {"ICH9", 2},
134 {"ICH9R", 2},
135 {"ICH9DH", 2},
136 {"ICH9DO", 2},
137 {"ICH9M", 2},
138 {"ICH9M-E", 2},
139 {"ICH10", 2},
140 {"ICH10R", 2},
141 {"ICH10D", 2},
142 {"ICH10DO", 2},
143 {"PCH Desktop Full Featured", 2},
144 {"PCH Mobile Full Featured", 2},
145 {"PCH Mobile SFF Full Featured", 2},
146 {NULL, 0}
147 };
148
149 #define ITCO_PCI_DEVICE(dev, data) \
150 .vendor = PCI_VENDOR_ID_INTEL, \
151 .device = dev, \
152 .subvendor = PCI_ANY_ID, \
153 .subdevice = PCI_ANY_ID, \
154 .class = 0, \
155 .class_mask = 0, \
156 .driver_data = data
157
158 /*
159 * This data only exists for exporting the supported PCI ids
160 * via MODULE_DEVICE_TABLE. We do not actually register a
161 * pci_driver, because the I/O Controller Hub has also other
162 * functions that probably will be registered by other drivers.
163 */
164 static struct pci_device_id iTCO_wdt_pci_tbl[] = {
165 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AA_0, TCO_ICH)},
166 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AB_0, TCO_ICH0)},
167 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_0, TCO_ICH2)},
168 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_10, TCO_ICH2M)},
169 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_0, TCO_ICH3)},
170 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_12, TCO_ICH3M)},
171 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_0, TCO_ICH4)},
172 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_12, TCO_ICH4M)},
173 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801E_0, TCO_CICH)},
174 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801EB_0, TCO_ICH5)},
175 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB_1, TCO_6300ESB)},
176 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_0, TCO_ICH6)},
177 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_1, TCO_ICH6M)},
178 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_2, TCO_ICH6W)},
179 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB2_0, TCO_631XESB)},
180 { ITCO_PCI_DEVICE(0x2671, TCO_631XESB)},
181 { ITCO_PCI_DEVICE(0x2672, TCO_631XESB)},
182 { ITCO_PCI_DEVICE(0x2673, TCO_631XESB)},
183 { ITCO_PCI_DEVICE(0x2674, TCO_631XESB)},
184 { ITCO_PCI_DEVICE(0x2675, TCO_631XESB)},
185 { ITCO_PCI_DEVICE(0x2676, TCO_631XESB)},
186 { ITCO_PCI_DEVICE(0x2677, TCO_631XESB)},
187 { ITCO_PCI_DEVICE(0x2678, TCO_631XESB)},
188 { ITCO_PCI_DEVICE(0x2679, TCO_631XESB)},
189 { ITCO_PCI_DEVICE(0x267a, TCO_631XESB)},
190 { ITCO_PCI_DEVICE(0x267b, TCO_631XESB)},
191 { ITCO_PCI_DEVICE(0x267c, TCO_631XESB)},
192 { ITCO_PCI_DEVICE(0x267d, TCO_631XESB)},
193 { ITCO_PCI_DEVICE(0x267e, TCO_631XESB)},
194 { ITCO_PCI_DEVICE(0x267f, TCO_631XESB)},
195 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_0, TCO_ICH7)},
196 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_30, TCO_ICH7DH)},
197 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_1, TCO_ICH7M)},
198 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_31, TCO_ICH7MDH)},
199 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_0, TCO_ICH8)},
200 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_2, TCO_ICH8DH)},
201 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_3, TCO_ICH8DO)},
202 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_4, TCO_ICH8M)},
203 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_1, TCO_ICH8ME)},
204 { ITCO_PCI_DEVICE(0x2918, TCO_ICH9)},
205 { ITCO_PCI_DEVICE(0x2916, TCO_ICH9R)},
206 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_2, TCO_ICH9DH)},
207 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_4, TCO_ICH9DO)},
208 { ITCO_PCI_DEVICE(0x2919, TCO_ICH9M)},
209 { ITCO_PCI_DEVICE(0x2917, TCO_ICH9ME)},
210 { ITCO_PCI_DEVICE(0x3a18, TCO_ICH10)},
211 { ITCO_PCI_DEVICE(0x3a16, TCO_ICH10R)},
212 { ITCO_PCI_DEVICE(0x3a1a, TCO_ICH10D)},
213 { ITCO_PCI_DEVICE(0x3a14, TCO_ICH10DO)},
214 { ITCO_PCI_DEVICE(0x3b00, TCO_PCH)},
215 { ITCO_PCI_DEVICE(0x3b01, TCO_PCHM)},
216 { ITCO_PCI_DEVICE(0x3b0d, TCO_PCHMSFF)},
217 { 0, }, /* End of list */
218 };
219 MODULE_DEVICE_TABLE(pci, iTCO_wdt_pci_tbl);
220
221 /* Address definitions for the TCO */
222 /* TCO base address */
223 #define TCOBASE (iTCO_wdt_private.ACPIBASE + 0x60)
224 /* SMI Control and Enable Register */
225 #define SMI_EN (iTCO_wdt_private.ACPIBASE + 0x30)
226
227 #define TCO_RLD (TCOBASE + 0x00) /* TCO Timer Reload and Curr. Value */
228 #define TCOv1_TMR (TCOBASE + 0x01) /* TCOv1 Timer Initial Value */
229 #define TCO_DAT_IN (TCOBASE + 0x02) /* TCO Data In Register */
230 #define TCO_DAT_OUT (TCOBASE + 0x03) /* TCO Data Out Register */
231 #define TCO1_STS (TCOBASE + 0x04) /* TCO1 Status Register */
232 #define TCO2_STS (TCOBASE + 0x06) /* TCO2 Status Register */
233 #define TCO1_CNT (TCOBASE + 0x08) /* TCO1 Control Register */
234 #define TCO2_CNT (TCOBASE + 0x0a) /* TCO2 Control Register */
235 #define TCOv2_TMR (TCOBASE + 0x12) /* TCOv2 Timer Initial Value */
236
237 /* internal variables */
238 static unsigned long is_active;
239 static char expect_release;
240 static struct { /* this is private data for the iTCO_wdt device */
241 /* TCO version/generation */
242 unsigned int iTCO_version;
243 /* The cards ACPIBASE address (TCOBASE = ACPIBASE+0x60) */
244 unsigned long ACPIBASE;
245 /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2)*/
246 unsigned long __iomem *gcs;
247 /* the lock for io operations */
248 spinlock_t io_lock;
249 /* the PCI-device */
250 struct pci_dev *pdev;
251 } iTCO_wdt_private;
252
253 /* the watchdog platform device */
254 static struct platform_device *iTCO_wdt_platform_device;
255
256 /* module parameters */
257 #define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */
258 static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
259 module_param(heartbeat, int, 0);
260 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
261 "(2<heartbeat<39 (TCO v1) or 613 (TCO v2), default="
262 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
263
264 static int nowayout = WATCHDOG_NOWAYOUT;
265 module_param(nowayout, int, 0);
266 MODULE_PARM_DESC(nowayout,
267 "Watchdog cannot be stopped once started (default="
268 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
269
270 /*
271 * Some TCO specific functions
272 */
273
274 static inline unsigned int seconds_to_ticks(int seconds)
275 {
276 /* the internal timer is stored as ticks which decrement
277 * every 0.6 seconds */
278 return (seconds * 10) / 6;
279 }
280
281 static void iTCO_wdt_set_NO_REBOOT_bit(void)
282 {
283 u32 val32;
284
285 /* Set the NO_REBOOT bit: this disables reboots */
286 if (iTCO_wdt_private.iTCO_version == 2) {
287 val32 = readl(iTCO_wdt_private.gcs);
288 val32 |= 0x00000020;
289 writel(val32, iTCO_wdt_private.gcs);
290 } else if (iTCO_wdt_private.iTCO_version == 1) {
291 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
292 val32 |= 0x00000002;
293 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
294 }
295 }
296
297 static int iTCO_wdt_unset_NO_REBOOT_bit(void)
298 {
299 int ret = 0;
300 u32 val32;
301
302 /* Unset the NO_REBOOT bit: this enables reboots */
303 if (iTCO_wdt_private.iTCO_version == 2) {
304 val32 = readl(iTCO_wdt_private.gcs);
305 val32 &= 0xffffffdf;
306 writel(val32, iTCO_wdt_private.gcs);
307
308 val32 = readl(iTCO_wdt_private.gcs);
309 if (val32 & 0x00000020)
310 ret = -EIO;
311 } else if (iTCO_wdt_private.iTCO_version == 1) {
312 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
313 val32 &= 0xfffffffd;
314 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
315
316 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
317 if (val32 & 0x00000002)
318 ret = -EIO;
319 }
320
321 return ret; /* returns: 0 = OK, -EIO = Error */
322 }
323
324 static int iTCO_wdt_start(void)
325 {
326 unsigned int val;
327
328 spin_lock(&iTCO_wdt_private.io_lock);
329
330 iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat);
331
332 /* disable chipset's NO_REBOOT bit */
333 if (iTCO_wdt_unset_NO_REBOOT_bit()) {
334 spin_unlock(&iTCO_wdt_private.io_lock);
335 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, "
336 "reboot disabled by hardware\n");
337 return -EIO;
338 }
339
340 /* Force the timer to its reload value by writing to the TCO_RLD
341 register */
342 if (iTCO_wdt_private.iTCO_version == 2)
343 outw(0x01, TCO_RLD);
344 else if (iTCO_wdt_private.iTCO_version == 1)
345 outb(0x01, TCO_RLD);
346
347 /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
348 val = inw(TCO1_CNT);
349 val &= 0xf7ff;
350 outw(val, TCO1_CNT);
351 val = inw(TCO1_CNT);
352 spin_unlock(&iTCO_wdt_private.io_lock);
353
354 if (val & 0x0800)
355 return -1;
356 return 0;
357 }
358
359 static int iTCO_wdt_stop(void)
360 {
361 unsigned int val;
362
363 spin_lock(&iTCO_wdt_private.io_lock);
364
365 iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE);
366
367 /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
368 val = inw(TCO1_CNT);
369 val |= 0x0800;
370 outw(val, TCO1_CNT);
371 val = inw(TCO1_CNT);
372
373 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
374 iTCO_wdt_set_NO_REBOOT_bit();
375
376 spin_unlock(&iTCO_wdt_private.io_lock);
377
378 if ((val & 0x0800) == 0)
379 return -1;
380 return 0;
381 }
382
383 static int iTCO_wdt_keepalive(void)
384 {
385 spin_lock(&iTCO_wdt_private.io_lock);
386
387 iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat);
388
389 /* Reload the timer by writing to the TCO Timer Counter register */
390 if (iTCO_wdt_private.iTCO_version == 2)
391 outw(0x01, TCO_RLD);
392 else if (iTCO_wdt_private.iTCO_version == 1)
393 outb(0x01, TCO_RLD);
394
395 spin_unlock(&iTCO_wdt_private.io_lock);
396 return 0;
397 }
398
399 static int iTCO_wdt_set_heartbeat(int t)
400 {
401 unsigned int val16;
402 unsigned char val8;
403 unsigned int tmrval;
404
405 tmrval = seconds_to_ticks(t);
406 /* from the specs: */
407 /* "Values of 0h-3h are ignored and should not be attempted" */
408 if (tmrval < 0x04)
409 return -EINVAL;
410 if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) ||
411 ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
412 return -EINVAL;
413
414 iTCO_vendor_pre_set_heartbeat(tmrval);
415
416 /* Write new heartbeat to watchdog */
417 if (iTCO_wdt_private.iTCO_version == 2) {
418 spin_lock(&iTCO_wdt_private.io_lock);
419 val16 = inw(TCOv2_TMR);
420 val16 &= 0xfc00;
421 val16 |= tmrval;
422 outw(val16, TCOv2_TMR);
423 val16 = inw(TCOv2_TMR);
424 spin_unlock(&iTCO_wdt_private.io_lock);
425
426 if ((val16 & 0x3ff) != tmrval)
427 return -EINVAL;
428 } else if (iTCO_wdt_private.iTCO_version == 1) {
429 spin_lock(&iTCO_wdt_private.io_lock);
430 val8 = inb(TCOv1_TMR);
431 val8 &= 0xc0;
432 val8 |= (tmrval & 0xff);
433 outb(val8, TCOv1_TMR);
434 val8 = inb(TCOv1_TMR);
435 spin_unlock(&iTCO_wdt_private.io_lock);
436
437 if ((val8 & 0x3f) != tmrval)
438 return -EINVAL;
439 }
440
441 heartbeat = t;
442 return 0;
443 }
444
445 static int iTCO_wdt_get_timeleft(int *time_left)
446 {
447 unsigned int val16;
448 unsigned char val8;
449
450 /* read the TCO Timer */
451 if (iTCO_wdt_private.iTCO_version == 2) {
452 spin_lock(&iTCO_wdt_private.io_lock);
453 val16 = inw(TCO_RLD);
454 val16 &= 0x3ff;
455 spin_unlock(&iTCO_wdt_private.io_lock);
456
457 *time_left = (val16 * 6) / 10;
458 } else if (iTCO_wdt_private.iTCO_version == 1) {
459 spin_lock(&iTCO_wdt_private.io_lock);
460 val8 = inb(TCO_RLD);
461 val8 &= 0x3f;
462 spin_unlock(&iTCO_wdt_private.io_lock);
463
464 *time_left = (val8 * 6) / 10;
465 } else
466 return -EINVAL;
467 return 0;
468 }
469
470 /*
471 * /dev/watchdog handling
472 */
473
474 static int iTCO_wdt_open(struct inode *inode, struct file *file)
475 {
476 /* /dev/watchdog can only be opened once */
477 if (test_and_set_bit(0, &is_active))
478 return -EBUSY;
479
480 /*
481 * Reload and activate timer
482 */
483 iTCO_wdt_start();
484 return nonseekable_open(inode, file);
485 }
486
487 static int iTCO_wdt_release(struct inode *inode, struct file *file)
488 {
489 /*
490 * Shut off the timer.
491 */
492 if (expect_release == 42) {
493 iTCO_wdt_stop();
494 } else {
495 printk(KERN_CRIT PFX
496 "Unexpected close, not stopping watchdog!\n");
497 iTCO_wdt_keepalive();
498 }
499 clear_bit(0, &is_active);
500 expect_release = 0;
501 return 0;
502 }
503
504 static ssize_t iTCO_wdt_write(struct file *file, const char __user *data,
505 size_t len, loff_t *ppos)
506 {
507 /* See if we got the magic character 'V' and reload the timer */
508 if (len) {
509 if (!nowayout) {
510 size_t i;
511
512 /* note: just in case someone wrote the magic
513 character five months ago... */
514 expect_release = 0;
515
516 /* scan to see whether or not we got the
517 magic character */
518 for (i = 0; i != len; i++) {
519 char c;
520 if (get_user(c, data + i))
521 return -EFAULT;
522 if (c == 'V')
523 expect_release = 42;
524 }
525 }
526
527 /* someone wrote to us, we should reload the timer */
528 iTCO_wdt_keepalive();
529 }
530 return len;
531 }
532
533 static long iTCO_wdt_ioctl(struct file *file, unsigned int cmd,
534 unsigned long arg)
535 {
536 int new_options, retval = -EINVAL;
537 int new_heartbeat;
538 void __user *argp = (void __user *)arg;
539 int __user *p = argp;
540 static struct watchdog_info ident = {
541 .options = WDIOF_SETTIMEOUT |
542 WDIOF_KEEPALIVEPING |
543 WDIOF_MAGICCLOSE,
544 .firmware_version = 0,
545 .identity = DRV_NAME,
546 };
547
548 switch (cmd) {
549 case WDIOC_GETSUPPORT:
550 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
551 case WDIOC_GETSTATUS:
552 case WDIOC_GETBOOTSTATUS:
553 return put_user(0, p);
554
555 case WDIOC_SETOPTIONS:
556 {
557 if (get_user(new_options, p))
558 return -EFAULT;
559
560 if (new_options & WDIOS_DISABLECARD) {
561 iTCO_wdt_stop();
562 retval = 0;
563 }
564 if (new_options & WDIOS_ENABLECARD) {
565 iTCO_wdt_keepalive();
566 iTCO_wdt_start();
567 retval = 0;
568 }
569 return retval;
570 }
571 case WDIOC_KEEPALIVE:
572 iTCO_wdt_keepalive();
573 return 0;
574
575 case WDIOC_SETTIMEOUT:
576 {
577 if (get_user(new_heartbeat, p))
578 return -EFAULT;
579 if (iTCO_wdt_set_heartbeat(new_heartbeat))
580 return -EINVAL;
581 iTCO_wdt_keepalive();
582 /* Fall */
583 }
584 case WDIOC_GETTIMEOUT:
585 return put_user(heartbeat, p);
586 case WDIOC_GETTIMELEFT:
587 {
588 int time_left;
589 if (iTCO_wdt_get_timeleft(&time_left))
590 return -EINVAL;
591 return put_user(time_left, p);
592 }
593 default:
594 return -ENOTTY;
595 }
596 }
597
598 /*
599 * Kernel Interfaces
600 */
601
602 static const struct file_operations iTCO_wdt_fops = {
603 .owner = THIS_MODULE,
604 .llseek = no_llseek,
605 .write = iTCO_wdt_write,
606 .unlocked_ioctl = iTCO_wdt_ioctl,
607 .open = iTCO_wdt_open,
608 .release = iTCO_wdt_release,
609 };
610
611 static struct miscdevice iTCO_wdt_miscdev = {
612 .minor = WATCHDOG_MINOR,
613 .name = "watchdog",
614 .fops = &iTCO_wdt_fops,
615 };
616
617 /*
618 * Init & exit routines
619 */
620
621 static int __devinit iTCO_wdt_init(struct pci_dev *pdev,
622 const struct pci_device_id *ent, struct platform_device *dev)
623 {
624 int ret;
625 u32 base_address;
626 unsigned long RCBA;
627 unsigned long val32;
628
629 /*
630 * Find the ACPI/PM base I/O address which is the base
631 * for the TCO registers (TCOBASE=ACPIBASE + 0x60)
632 * ACPIBASE is bits [15:7] from 0x40-0x43
633 */
634 pci_read_config_dword(pdev, 0x40, &base_address);
635 base_address &= 0x0000ff80;
636 if (base_address == 0x00000000) {
637 /* Something's wrong here, ACPIBASE has to be set */
638 printk(KERN_ERR PFX "failed to get TCOBASE address\n");
639 pci_dev_put(pdev);
640 return -ENODEV;
641 }
642 iTCO_wdt_private.iTCO_version =
643 iTCO_chipset_info[ent->driver_data].iTCO_version;
644 iTCO_wdt_private.ACPIBASE = base_address;
645 iTCO_wdt_private.pdev = pdev;
646
647 /* Get the Memory-Mapped GCS register, we need it for the
648 NO_REBOOT flag (TCO v2). To get access to it you have to
649 read RCBA from PCI Config space 0xf0 and use it as base.
650 GCS = RCBA + ICH6_GCS(0x3410). */
651 if (iTCO_wdt_private.iTCO_version == 2) {
652 pci_read_config_dword(pdev, 0xf0, &base_address);
653 if ((base_address & 1) == 0) {
654 printk(KERN_ERR PFX "RCBA is disabled by harddware\n");
655 ret = -ENODEV;
656 goto out;
657 }
658 RCBA = base_address & 0xffffc000;
659 iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410), 4);
660 }
661
662 /* Check chipset's NO_REBOOT bit */
663 if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
664 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, "
665 "reboot disabled by hardware\n");
666 ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
667 goto out_unmap;
668 }
669
670 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
671 iTCO_wdt_set_NO_REBOOT_bit();
672
673 /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
674 if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
675 printk(KERN_ERR PFX
676 "I/O address 0x%04lx already in use\n", SMI_EN);
677 ret = -EIO;
678 goto out_unmap;
679 }
680 /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
681 val32 = inl(SMI_EN);
682 val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
683 outl(val32, SMI_EN);
684
685 /* The TCO I/O registers reside in a 32-byte range pointed to
686 by the TCOBASE value */
687 if (!request_region(TCOBASE, 0x20, "iTCO_wdt")) {
688 printk(KERN_ERR PFX "I/O address 0x%04lx already in use\n",
689 TCOBASE);
690 ret = -EIO;
691 goto unreg_smi_en;
692 }
693
694 printk(KERN_INFO PFX
695 "Found a %s TCO device (Version=%d, TCOBASE=0x%04lx)\n",
696 iTCO_chipset_info[ent->driver_data].name,
697 iTCO_chipset_info[ent->driver_data].iTCO_version,
698 TCOBASE);
699
700 /* Clear out the (probably old) status */
701 outb(8, TCO1_STS); /* Clear the Time Out Status bit */
702 outb(2, TCO2_STS); /* Clear SECOND_TO_STS bit */
703 outb(4, TCO2_STS); /* Clear BOOT_STS bit */
704
705 /* Make sure the watchdog is not running */
706 iTCO_wdt_stop();
707
708 /* Check that the heartbeat value is within it's range;
709 if not reset to the default */
710 if (iTCO_wdt_set_heartbeat(heartbeat)) {
711 iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
712 printk(KERN_INFO PFX
713 "heartbeat value must be 2 < heartbeat < 39 (TCO v1) "
714 "or 613 (TCO v2), using %d\n", heartbeat);
715 }
716
717 ret = misc_register(&iTCO_wdt_miscdev);
718 if (ret != 0) {
719 printk(KERN_ERR PFX
720 "cannot register miscdev on minor=%d (err=%d)\n",
721 WATCHDOG_MINOR, ret);
722 goto unreg_region;
723 }
724
725 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
726 heartbeat, nowayout);
727
728 return 0;
729
730 unreg_region:
731 release_region(TCOBASE, 0x20);
732 unreg_smi_en:
733 release_region(SMI_EN, 4);
734 out_unmap:
735 if (iTCO_wdt_private.iTCO_version == 2)
736 iounmap(iTCO_wdt_private.gcs);
737 out:
738 pci_dev_put(iTCO_wdt_private.pdev);
739 iTCO_wdt_private.ACPIBASE = 0;
740 return ret;
741 }
742
743 static void __devexit iTCO_wdt_cleanup(void)
744 {
745 /* Stop the timer before we leave */
746 if (!nowayout)
747 iTCO_wdt_stop();
748
749 /* Deregister */
750 misc_deregister(&iTCO_wdt_miscdev);
751 release_region(TCOBASE, 0x20);
752 release_region(SMI_EN, 4);
753 if (iTCO_wdt_private.iTCO_version == 2)
754 iounmap(iTCO_wdt_private.gcs);
755 pci_dev_put(iTCO_wdt_private.pdev);
756 iTCO_wdt_private.ACPIBASE = 0;
757 }
758
759 static int __devinit iTCO_wdt_probe(struct platform_device *dev)
760 {
761 int found = 0;
762 struct pci_dev *pdev = NULL;
763 const struct pci_device_id *ent;
764
765 spin_lock_init(&iTCO_wdt_private.io_lock);
766
767 for_each_pci_dev(pdev) {
768 ent = pci_match_id(iTCO_wdt_pci_tbl, pdev);
769 if (ent) {
770 if (!(iTCO_wdt_init(pdev, ent, dev))) {
771 found++;
772 break;
773 }
774 }
775 }
776
777 if (!found) {
778 printk(KERN_INFO PFX "No card detected\n");
779 return -ENODEV;
780 }
781
782 return 0;
783 }
784
785 static int __devexit iTCO_wdt_remove(struct platform_device *dev)
786 {
787 if (iTCO_wdt_private.ACPIBASE)
788 iTCO_wdt_cleanup();
789
790 return 0;
791 }
792
793 static void iTCO_wdt_shutdown(struct platform_device *dev)
794 {
795 iTCO_wdt_stop();
796 }
797
798 #define iTCO_wdt_suspend NULL
799 #define iTCO_wdt_resume NULL
800
801 static struct platform_driver iTCO_wdt_driver = {
802 .probe = iTCO_wdt_probe,
803 .remove = __devexit_p(iTCO_wdt_remove),
804 .shutdown = iTCO_wdt_shutdown,
805 .suspend = iTCO_wdt_suspend,
806 .resume = iTCO_wdt_resume,
807 .driver = {
808 .owner = THIS_MODULE,
809 .name = DRV_NAME,
810 },
811 };
812
813 static int __init iTCO_wdt_init_module(void)
814 {
815 int err;
816
817 printk(KERN_INFO PFX "Intel TCO WatchDog Timer Driver v%s\n",
818 DRV_VERSION);
819
820 err = platform_driver_register(&iTCO_wdt_driver);
821 if (err)
822 return err;
823
824 iTCO_wdt_platform_device = platform_device_register_simple(DRV_NAME,
825 -1, NULL, 0);
826 if (IS_ERR(iTCO_wdt_platform_device)) {
827 err = PTR_ERR(iTCO_wdt_platform_device);
828 goto unreg_platform_driver;
829 }
830
831 return 0;
832
833 unreg_platform_driver:
834 platform_driver_unregister(&iTCO_wdt_driver);
835 return err;
836 }
837
838 static void __exit iTCO_wdt_cleanup_module(void)
839 {
840 platform_device_unregister(iTCO_wdt_platform_device);
841 platform_driver_unregister(&iTCO_wdt_driver);
842 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
843 }
844
845 module_init(iTCO_wdt_init_module);
846 module_exit(iTCO_wdt_cleanup_module);
847
848 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
849 MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
850 MODULE_VERSION(DRV_VERSION);
851 MODULE_LICENSE("GPL");
852 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Linus' kernel tree