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mm: fix dubious code in __count_immobile_pages()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / watchdog / iTCO_wdt.c
blob2c6c2b4ad8bf5f8a6d1cfbd68d923fb4da2fc4cf
1 /*
2 * intel TCO Watchdog Driver
3 *
4 * (c) Copyright 2006-2010 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 322896-001, 322897-001: NM10
30 * document number 313056-003, 313057-017: 82801H (ICH8)
31 * document number 316972-004, 316973-012: 82801I (ICH9)
32 * document number 319973-002, 319974-002: 82801J (ICH10)
33 * document number 322169-001, 322170-003: 5 Series, 3400 Series (PCH)
34 * document number 320066-003, 320257-008: EP80597 (IICH)
35 * document number 324645-001, 324646-001: Cougar Point (CPT)
36 * document number TBD : Patsburg (PBG)
37 * document number TBD : DH89xxCC
38 */
39
40 /*
41 * Includes, defines, variables, module parameters, ...
42 */
43
44 /* Module and version information */
45 #define DRV_NAME "iTCO_wdt"
46 #define DRV_VERSION "1.06"
47 #define PFX DRV_NAME ": "
48
49 /* Includes */
50 #include <linux/module.h> /* For module specific items */
51 #include <linux/moduleparam.h> /* For new moduleparam's */
52 #include <linux/types.h> /* For standard types (like size_t) */
53 #include <linux/errno.h> /* For the -ENODEV/... values */
54 #include <linux/kernel.h> /* For printk/panic/... */
55 #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
56 (WATCHDOG_MINOR) */
57 #include <linux/watchdog.h> /* For the watchdog specific items */
58 #include <linux/init.h> /* For __init/__exit/... */
59 #include <linux/fs.h> /* For file operations */
60 #include <linux/platform_device.h> /* For platform_driver framework */
61 #include <linux/pci.h> /* For pci functions */
62 #include <linux/ioport.h> /* For io-port access */
63 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
64 #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
65 #include <linux/io.h> /* For inb/outb/... */
66
67 #include "iTCO_vendor.h"
68
69 /* TCO related info */
70 enum iTCO_chipsets {
71 TCO_ICH = 0, /* ICH */
72 TCO_ICH0, /* ICH0 */
73 TCO_ICH2, /* ICH2 */
74 TCO_ICH2M, /* ICH2-M */
75 TCO_ICH3, /* ICH3-S */
76 TCO_ICH3M, /* ICH3-M */
77 TCO_ICH4, /* ICH4 */
78 TCO_ICH4M, /* ICH4-M */
79 TCO_CICH, /* C-ICH */
80 TCO_ICH5, /* ICH5 & ICH5R */
81 TCO_6300ESB, /* 6300ESB */
82 TCO_ICH6, /* ICH6 & ICH6R */
83 TCO_ICH6M, /* ICH6-M */
84 TCO_ICH6W, /* ICH6W & ICH6RW */
85 TCO_631XESB, /* 631xESB/632xESB */
86 TCO_ICH7, /* ICH7 & ICH7R */
87 TCO_ICH7DH, /* ICH7DH */
88 TCO_ICH7M, /* ICH7-M & ICH7-U */
89 TCO_ICH7MDH, /* ICH7-M DH */
90 TCO_NM10, /* NM10 */
91 TCO_ICH8, /* ICH8 & ICH8R */
92 TCO_ICH8DH, /* ICH8DH */
93 TCO_ICH8DO, /* ICH8DO */
94 TCO_ICH8M, /* ICH8M */
95 TCO_ICH8ME, /* ICH8M-E */
96 TCO_ICH9, /* ICH9 */
97 TCO_ICH9R, /* ICH9R */
98 TCO_ICH9DH, /* ICH9DH */
99 TCO_ICH9DO, /* ICH9DO */
100 TCO_ICH9M, /* ICH9M */
101 TCO_ICH9ME, /* ICH9M-E */
102 TCO_ICH10, /* ICH10 */
103 TCO_ICH10R, /* ICH10R */
104 TCO_ICH10D, /* ICH10D */
105 TCO_ICH10DO, /* ICH10DO */
106 TCO_PCH, /* PCH Desktop Full Featured */
107 TCO_PCHM, /* PCH Mobile Full Featured */
108 TCO_P55, /* P55 */
109 TCO_PM55, /* PM55 */
110 TCO_H55, /* H55 */
111 TCO_QM57, /* QM57 */
112 TCO_H57, /* H57 */
113 TCO_HM55, /* HM55 */
114 TCO_Q57, /* Q57 */
115 TCO_HM57, /* HM57 */
116 TCO_PCHMSFF, /* PCH Mobile SFF Full Featured */
117 TCO_QS57, /* QS57 */
118 TCO_3400, /* 3400 */
119 TCO_3420, /* 3420 */
120 TCO_3450, /* 3450 */
121 TCO_EP80579, /* EP80579 */
122 TCO_CPT1, /* Cougar Point */
123 TCO_CPT2, /* Cougar Point Desktop */
124 TCO_CPT3, /* Cougar Point Mobile */
125 TCO_CPT4, /* Cougar Point */
126 TCO_CPT5, /* Cougar Point */
127 TCO_CPT6, /* Cougar Point */
128 TCO_CPT7, /* Cougar Point */
129 TCO_CPT8, /* Cougar Point */
130 TCO_CPT9, /* Cougar Point */
131 TCO_CPT10, /* Cougar Point */
132 TCO_CPT11, /* Cougar Point */
133 TCO_CPT12, /* Cougar Point */
134 TCO_CPT13, /* Cougar Point */
135 TCO_CPT14, /* Cougar Point */
136 TCO_CPT15, /* Cougar Point */
137 TCO_CPT16, /* Cougar Point */
138 TCO_CPT17, /* Cougar Point */
139 TCO_CPT18, /* Cougar Point */
140 TCO_CPT19, /* Cougar Point */
141 TCO_CPT20, /* Cougar Point */
142 TCO_CPT21, /* Cougar Point */
143 TCO_CPT22, /* Cougar Point */
144 TCO_CPT23, /* Cougar Point */
145 TCO_CPT24, /* Cougar Point */
146 TCO_CPT25, /* Cougar Point */
147 TCO_CPT26, /* Cougar Point */
148 TCO_CPT27, /* Cougar Point */
149 TCO_CPT28, /* Cougar Point */
150 TCO_CPT29, /* Cougar Point */
151 TCO_CPT30, /* Cougar Point */
152 TCO_CPT31, /* Cougar Point */
153 TCO_PBG1, /* Patsburg */
154 TCO_PBG2, /* Patsburg */
155 TCO_DH89XXCC, /* DH89xxCC */
156 };
157
158 static struct {
159 char *name;
160 unsigned int iTCO_version;
161 } iTCO_chipset_info[] __devinitdata = {
162 {"ICH", 1},
163 {"ICH0", 1},
164 {"ICH2", 1},
165 {"ICH2-M", 1},
166 {"ICH3-S", 1},
167 {"ICH3-M", 1},
168 {"ICH4", 1},
169 {"ICH4-M", 1},
170 {"C-ICH", 1},
171 {"ICH5 or ICH5R", 1},
172 {"6300ESB", 1},
173 {"ICH6 or ICH6R", 2},
174 {"ICH6-M", 2},
175 {"ICH6W or ICH6RW", 2},
176 {"631xESB/632xESB", 2},
177 {"ICH7 or ICH7R", 2},
178 {"ICH7DH", 2},
179 {"ICH7-M or ICH7-U", 2},
180 {"ICH7-M DH", 2},
181 {"NM10", 2},
182 {"ICH8 or ICH8R", 2},
183 {"ICH8DH", 2},
184 {"ICH8DO", 2},
185 {"ICH8M", 2},
186 {"ICH8M-E", 2},
187 {"ICH9", 2},
188 {"ICH9R", 2},
189 {"ICH9DH", 2},
190 {"ICH9DO", 2},
191 {"ICH9M", 2},
192 {"ICH9M-E", 2},
193 {"ICH10", 2},
194 {"ICH10R", 2},
195 {"ICH10D", 2},
196 {"ICH10DO", 2},
197 {"PCH Desktop Full Featured", 2},
198 {"PCH Mobile Full Featured", 2},
199 {"P55", 2},
200 {"PM55", 2},
201 {"H55", 2},
202 {"QM57", 2},
203 {"H57", 2},
204 {"HM55", 2},
205 {"Q57", 2},
206 {"HM57", 2},
207 {"PCH Mobile SFF Full Featured", 2},
208 {"QS57", 2},
209 {"3400", 2},
210 {"3420", 2},
211 {"3450", 2},
212 {"EP80579", 2},
213 {"Cougar Point", 2},
214 {"Cougar Point", 2},
215 {"Cougar Point", 2},
216 {"Cougar Point", 2},
217 {"Cougar Point", 2},
218 {"Cougar Point", 2},
219 {"Cougar Point", 2},
220 {"Cougar Point", 2},
221 {"Cougar Point", 2},
222 {"Cougar Point", 2},
223 {"Cougar Point", 2},
224 {"Cougar Point", 2},
225 {"Cougar Point", 2},
226 {"Cougar Point", 2},
227 {"Cougar Point", 2},
228 {"Cougar Point", 2},
229 {"Cougar Point", 2},
230 {"Cougar Point", 2},
231 {"Cougar Point", 2},
232 {"Cougar Point", 2},
233 {"Cougar Point", 2},
234 {"Cougar Point", 2},
235 {"Cougar Point", 2},
236 {"Cougar Point", 2},
237 {"Cougar Point", 2},
238 {"Cougar Point", 2},
239 {"Cougar Point", 2},
240 {"Cougar Point", 2},
241 {"Cougar Point", 2},
242 {"Cougar Point", 2},
243 {"Cougar Point", 2},
244 {"Patsburg", 2},
245 {"Patsburg", 2},
246 {"DH89xxCC", 2},
247 {NULL, 0}
248 };
249
250 #define ITCO_PCI_DEVICE(dev, data) \
251 .vendor = PCI_VENDOR_ID_INTEL, \
252 .device = dev, \
253 .subvendor = PCI_ANY_ID, \
254 .subdevice = PCI_ANY_ID, \
255 .class = 0, \
256 .class_mask = 0, \
257 .driver_data = data
258
259 /*
260 * This data only exists for exporting the supported PCI ids
261 * via MODULE_DEVICE_TABLE. We do not actually register a
262 * pci_driver, because the I/O Controller Hub has also other
263 * functions that probably will be registered by other drivers.
264 */
265 static struct pci_device_id iTCO_wdt_pci_tbl[] = {
266 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AA_0, TCO_ICH)},
267 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AB_0, TCO_ICH0)},
268 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_0, TCO_ICH2)},
269 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_10, TCO_ICH2M)},
270 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_0, TCO_ICH3)},
271 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_12, TCO_ICH3M)},
272 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_0, TCO_ICH4)},
273 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_12, TCO_ICH4M)},
274 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801E_0, TCO_CICH)},
275 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801EB_0, TCO_ICH5)},
276 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB_1, TCO_6300ESB)},
277 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_0, TCO_ICH6)},
278 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_1, TCO_ICH6M)},
279 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_2, TCO_ICH6W)},
280 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB2_0, TCO_631XESB)},
281 { ITCO_PCI_DEVICE(0x2671, TCO_631XESB)},
282 { ITCO_PCI_DEVICE(0x2672, TCO_631XESB)},
283 { ITCO_PCI_DEVICE(0x2673, TCO_631XESB)},
284 { ITCO_PCI_DEVICE(0x2674, TCO_631XESB)},
285 { ITCO_PCI_DEVICE(0x2675, TCO_631XESB)},
286 { ITCO_PCI_DEVICE(0x2676, TCO_631XESB)},
287 { ITCO_PCI_DEVICE(0x2677, TCO_631XESB)},
288 { ITCO_PCI_DEVICE(0x2678, TCO_631XESB)},
289 { ITCO_PCI_DEVICE(0x2679, TCO_631XESB)},
290 { ITCO_PCI_DEVICE(0x267a, TCO_631XESB)},
291 { ITCO_PCI_DEVICE(0x267b, TCO_631XESB)},
292 { ITCO_PCI_DEVICE(0x267c, TCO_631XESB)},
293 { ITCO_PCI_DEVICE(0x267d, TCO_631XESB)},
294 { ITCO_PCI_DEVICE(0x267e, TCO_631XESB)},
295 { ITCO_PCI_DEVICE(0x267f, TCO_631XESB)},
296 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_0, TCO_ICH7)},
297 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_30, TCO_ICH7DH)},
298 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_1, TCO_ICH7M)},
299 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_31, TCO_ICH7MDH)},
300 { ITCO_PCI_DEVICE(0x27bc, TCO_NM10)},
301 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_0, TCO_ICH8)},
302 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_2, TCO_ICH8DH)},
303 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_3, TCO_ICH8DO)},
304 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_4, TCO_ICH8M)},
305 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_1, TCO_ICH8ME)},
306 { ITCO_PCI_DEVICE(0x2918, TCO_ICH9)},
307 { ITCO_PCI_DEVICE(0x2916, TCO_ICH9R)},
308 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_2, TCO_ICH9DH)},
309 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_4, TCO_ICH9DO)},
310 { ITCO_PCI_DEVICE(0x2919, TCO_ICH9M)},
311 { ITCO_PCI_DEVICE(0x2917, TCO_ICH9ME)},
312 { ITCO_PCI_DEVICE(0x3a18, TCO_ICH10)},
313 { ITCO_PCI_DEVICE(0x3a16, TCO_ICH10R)},
314 { ITCO_PCI_DEVICE(0x3a1a, TCO_ICH10D)},
315 { ITCO_PCI_DEVICE(0x3a14, TCO_ICH10DO)},
316 { ITCO_PCI_DEVICE(0x3b00, TCO_PCH)},
317 { ITCO_PCI_DEVICE(0x3b01, TCO_PCHM)},
318 { ITCO_PCI_DEVICE(0x3b02, TCO_P55)},
319 { ITCO_PCI_DEVICE(0x3b03, TCO_PM55)},
320 { ITCO_PCI_DEVICE(0x3b06, TCO_H55)},
321 { ITCO_PCI_DEVICE(0x3b07, TCO_QM57)},
322 { ITCO_PCI_DEVICE(0x3b08, TCO_H57)},
323 { ITCO_PCI_DEVICE(0x3b09, TCO_HM55)},
324 { ITCO_PCI_DEVICE(0x3b0a, TCO_Q57)},
325 { ITCO_PCI_DEVICE(0x3b0b, TCO_HM57)},
326 { ITCO_PCI_DEVICE(0x3b0d, TCO_PCHMSFF)},
327 { ITCO_PCI_DEVICE(0x3b0f, TCO_QS57)},
328 { ITCO_PCI_DEVICE(0x3b12, TCO_3400)},
329 { ITCO_PCI_DEVICE(0x3b14, TCO_3420)},
330 { ITCO_PCI_DEVICE(0x3b16, TCO_3450)},
331 { ITCO_PCI_DEVICE(0x5031, TCO_EP80579)},
332 { ITCO_PCI_DEVICE(0x1c41, TCO_CPT1)},
333 { ITCO_PCI_DEVICE(0x1c42, TCO_CPT2)},
334 { ITCO_PCI_DEVICE(0x1c43, TCO_CPT3)},
335 { ITCO_PCI_DEVICE(0x1c44, TCO_CPT4)},
336 { ITCO_PCI_DEVICE(0x1c45, TCO_CPT5)},
337 { ITCO_PCI_DEVICE(0x1c46, TCO_CPT6)},
338 { ITCO_PCI_DEVICE(0x1c47, TCO_CPT7)},
339 { ITCO_PCI_DEVICE(0x1c48, TCO_CPT8)},
340 { ITCO_PCI_DEVICE(0x1c49, TCO_CPT9)},
341 { ITCO_PCI_DEVICE(0x1c4a, TCO_CPT10)},
342 { ITCO_PCI_DEVICE(0x1c4b, TCO_CPT11)},
343 { ITCO_PCI_DEVICE(0x1c4c, TCO_CPT12)},
344 { ITCO_PCI_DEVICE(0x1c4d, TCO_CPT13)},
345 { ITCO_PCI_DEVICE(0x1c4e, TCO_CPT14)},
346 { ITCO_PCI_DEVICE(0x1c4f, TCO_CPT15)},
347 { ITCO_PCI_DEVICE(0x1c50, TCO_CPT16)},
348 { ITCO_PCI_DEVICE(0x1c51, TCO_CPT17)},
349 { ITCO_PCI_DEVICE(0x1c52, TCO_CPT18)},
350 { ITCO_PCI_DEVICE(0x1c53, TCO_CPT19)},
351 { ITCO_PCI_DEVICE(0x1c54, TCO_CPT20)},
352 { ITCO_PCI_DEVICE(0x1c55, TCO_CPT21)},
353 { ITCO_PCI_DEVICE(0x1c56, TCO_CPT22)},
354 { ITCO_PCI_DEVICE(0x1c57, TCO_CPT23)},
355 { ITCO_PCI_DEVICE(0x1c58, TCO_CPT24)},
356 { ITCO_PCI_DEVICE(0x1c59, TCO_CPT25)},
357 { ITCO_PCI_DEVICE(0x1c5a, TCO_CPT26)},
358 { ITCO_PCI_DEVICE(0x1c5b, TCO_CPT27)},
359 { ITCO_PCI_DEVICE(0x1c5c, TCO_CPT28)},
360 { ITCO_PCI_DEVICE(0x1c5d, TCO_CPT29)},
361 { ITCO_PCI_DEVICE(0x1c5e, TCO_CPT30)},
362 { ITCO_PCI_DEVICE(0x1c5f, TCO_CPT31)},
363 { ITCO_PCI_DEVICE(0x1d40, TCO_PBG1)},
364 { ITCO_PCI_DEVICE(0x1d41, TCO_PBG2)},
365 { ITCO_PCI_DEVICE(0x2310, TCO_DH89XXCC)},
366 { 0, }, /* End of list */
367 };
368 MODULE_DEVICE_TABLE(pci, iTCO_wdt_pci_tbl);
369
370 /* Address definitions for the TCO */
371 /* TCO base address */
372 #define TCOBASE (iTCO_wdt_private.ACPIBASE + 0x60)
373 /* SMI Control and Enable Register */
374 #define SMI_EN (iTCO_wdt_private.ACPIBASE + 0x30)
375
376 #define TCO_RLD (TCOBASE + 0x00) /* TCO Timer Reload and Curr. Value */
377 #define TCOv1_TMR (TCOBASE + 0x01) /* TCOv1 Timer Initial Value */
378 #define TCO_DAT_IN (TCOBASE + 0x02) /* TCO Data In Register */
379 #define TCO_DAT_OUT (TCOBASE + 0x03) /* TCO Data Out Register */
380 #define TCO1_STS (TCOBASE + 0x04) /* TCO1 Status Register */
381 #define TCO2_STS (TCOBASE + 0x06) /* TCO2 Status Register */
382 #define TCO1_CNT (TCOBASE + 0x08) /* TCO1 Control Register */
383 #define TCO2_CNT (TCOBASE + 0x0a) /* TCO2 Control Register */
384 #define TCOv2_TMR (TCOBASE + 0x12) /* TCOv2 Timer Initial Value */
385
386 /* internal variables */
387 static unsigned long is_active;
388 static char expect_release;
389 static struct { /* this is private data for the iTCO_wdt device */
390 /* TCO version/generation */
391 unsigned int iTCO_version;
392 /* The device's ACPIBASE address (TCOBASE = ACPIBASE+0x60) */
393 unsigned long ACPIBASE;
394 /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2)*/
395 unsigned long __iomem *gcs;
396 /* the lock for io operations */
397 spinlock_t io_lock;
398 /* the PCI-device */
399 struct pci_dev *pdev;
400 } iTCO_wdt_private;
401
402 /* the watchdog platform device */
403 static struct platform_device *iTCO_wdt_platform_device;
404
405 /* module parameters */
406 #define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */
407 static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
408 module_param(heartbeat, int, 0);
409 MODULE_PARM_DESC(heartbeat, "Watchdog timeout in seconds. "
410 "5..76 (TCO v1) or 3..614 (TCO v2), default="
411 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
412
413 static int nowayout = WATCHDOG_NOWAYOUT;
414 module_param(nowayout, int, 0);
415 MODULE_PARM_DESC(nowayout,
416 "Watchdog cannot be stopped once started (default="
417 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
418
419 /*
420 * Some TCO specific functions
421 */
422
423 static inline unsigned int seconds_to_ticks(int seconds)
424 {
425 /* the internal timer is stored as ticks which decrement
426 * every 0.6 seconds */
427 return (seconds * 10) / 6;
428 }
429
430 static void iTCO_wdt_set_NO_REBOOT_bit(void)
431 {
432 u32 val32;
433
434 /* Set the NO_REBOOT bit: this disables reboots */
435 if (iTCO_wdt_private.iTCO_version == 2) {
436 val32 = readl(iTCO_wdt_private.gcs);
437 val32 |= 0x00000020;
438 writel(val32, iTCO_wdt_private.gcs);
439 } else if (iTCO_wdt_private.iTCO_version == 1) {
440 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
441 val32 |= 0x00000002;
442 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
443 }
444 }
445
446 static int iTCO_wdt_unset_NO_REBOOT_bit(void)
447 {
448 int ret = 0;
449 u32 val32;
450
451 /* Unset the NO_REBOOT bit: this enables reboots */
452 if (iTCO_wdt_private.iTCO_version == 2) {
453 val32 = readl(iTCO_wdt_private.gcs);
454 val32 &= 0xffffffdf;
455 writel(val32, iTCO_wdt_private.gcs);
456
457 val32 = readl(iTCO_wdt_private.gcs);
458 if (val32 & 0x00000020)
459 ret = -EIO;
460 } else if (iTCO_wdt_private.iTCO_version == 1) {
461 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
462 val32 &= 0xfffffffd;
463 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
464
465 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
466 if (val32 & 0x00000002)
467 ret = -EIO;
468 }
469
470 return ret; /* returns: 0 = OK, -EIO = Error */
471 }
472
473 static int iTCO_wdt_start(void)
474 {
475 unsigned int val;
476
477 spin_lock(&iTCO_wdt_private.io_lock);
478
479 iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat);
480
481 /* disable chipset's NO_REBOOT bit */
482 if (iTCO_wdt_unset_NO_REBOOT_bit()) {
483 spin_unlock(&iTCO_wdt_private.io_lock);
484 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, "
485 "reboot disabled by hardware/BIOS\n");
486 return -EIO;
487 }
488
489 /* Force the timer to its reload value by writing to the TCO_RLD
490 register */
491 if (iTCO_wdt_private.iTCO_version == 2)
492 outw(0x01, TCO_RLD);
493 else if (iTCO_wdt_private.iTCO_version == 1)
494 outb(0x01, TCO_RLD);
495
496 /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
497 val = inw(TCO1_CNT);
498 val &= 0xf7ff;
499 outw(val, TCO1_CNT);
500 val = inw(TCO1_CNT);
501 spin_unlock(&iTCO_wdt_private.io_lock);
502
503 if (val & 0x0800)
504 return -1;
505 return 0;
506 }
507
508 static int iTCO_wdt_stop(void)
509 {
510 unsigned int val;
511
512 spin_lock(&iTCO_wdt_private.io_lock);
513
514 iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE);
515
516 /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
517 val = inw(TCO1_CNT);
518 val |= 0x0800;
519 outw(val, TCO1_CNT);
520 val = inw(TCO1_CNT);
521
522 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
523 iTCO_wdt_set_NO_REBOOT_bit();
524
525 spin_unlock(&iTCO_wdt_private.io_lock);
526
527 if ((val & 0x0800) == 0)
528 return -1;
529 return 0;
530 }
531
532 static int iTCO_wdt_keepalive(void)
533 {
534 spin_lock(&iTCO_wdt_private.io_lock);
535
536 iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat);
537
538 /* Reload the timer by writing to the TCO Timer Counter register */
539 if (iTCO_wdt_private.iTCO_version == 2)
540 outw(0x01, TCO_RLD);
541 else if (iTCO_wdt_private.iTCO_version == 1) {
542 /* Reset the timeout status bit so that the timer
543 * needs to count down twice again before rebooting */
544 outw(0x0008, TCO1_STS); /* write 1 to clear bit */
545
546 outb(0x01, TCO_RLD);
547 }
548
549 spin_unlock(&iTCO_wdt_private.io_lock);
550 return 0;
551 }
552
553 static int iTCO_wdt_set_heartbeat(int t)
554 {
555 unsigned int val16;
556 unsigned char val8;
557 unsigned int tmrval;
558
559 tmrval = seconds_to_ticks(t);
560
561 /* For TCO v1 the timer counts down twice before rebooting */
562 if (iTCO_wdt_private.iTCO_version == 1)
563 tmrval /= 2;
564
565 /* from the specs: */
566 /* "Values of 0h-3h are ignored and should not be attempted" */
567 if (tmrval < 0x04)
568 return -EINVAL;
569 if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) ||
570 ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
571 return -EINVAL;
572
573 iTCO_vendor_pre_set_heartbeat(tmrval);
574
575 /* Write new heartbeat to watchdog */
576 if (iTCO_wdt_private.iTCO_version == 2) {
577 spin_lock(&iTCO_wdt_private.io_lock);
578 val16 = inw(TCOv2_TMR);
579 val16 &= 0xfc00;
580 val16 |= tmrval;
581 outw(val16, TCOv2_TMR);
582 val16 = inw(TCOv2_TMR);
583 spin_unlock(&iTCO_wdt_private.io_lock);
584
585 if ((val16 & 0x3ff) != tmrval)
586 return -EINVAL;
587 } else if (iTCO_wdt_private.iTCO_version == 1) {
588 spin_lock(&iTCO_wdt_private.io_lock);
589 val8 = inb(TCOv1_TMR);
590 val8 &= 0xc0;
591 val8 |= (tmrval & 0xff);
592 outb(val8, TCOv1_TMR);
593 val8 = inb(TCOv1_TMR);
594 spin_unlock(&iTCO_wdt_private.io_lock);
595
596 if ((val8 & 0x3f) != tmrval)
597 return -EINVAL;
598 }
599
600 heartbeat = t;
601 return 0;
602 }
603
604 static int iTCO_wdt_get_timeleft(int *time_left)
605 {
606 unsigned int val16;
607 unsigned char val8;
608
609 /* read the TCO Timer */
610 if (iTCO_wdt_private.iTCO_version == 2) {
611 spin_lock(&iTCO_wdt_private.io_lock);
612 val16 = inw(TCO_RLD);
613 val16 &= 0x3ff;
614 spin_unlock(&iTCO_wdt_private.io_lock);
615
616 *time_left = (val16 * 6) / 10;
617 } else if (iTCO_wdt_private.iTCO_version == 1) {
618 spin_lock(&iTCO_wdt_private.io_lock);
619 val8 = inb(TCO_RLD);
620 val8 &= 0x3f;
621 if (!(inw(TCO1_STS) & 0x0008))
622 val8 += (inb(TCOv1_TMR) & 0x3f);
623 spin_unlock(&iTCO_wdt_private.io_lock);
624
625 *time_left = (val8 * 6) / 10;
626 } else
627 return -EINVAL;
628 return 0;
629 }
630
631 /*
632 * /dev/watchdog handling
633 */
634
635 static int iTCO_wdt_open(struct inode *inode, struct file *file)
636 {
637 /* /dev/watchdog can only be opened once */
638 if (test_and_set_bit(0, &is_active))
639 return -EBUSY;
640
641 /*
642 * Reload and activate timer
643 */
644 iTCO_wdt_start();
645 return nonseekable_open(inode, file);
646 }
647
648 static int iTCO_wdt_release(struct inode *inode, struct file *file)
649 {
650 /*
651 * Shut off the timer.
652 */
653 if (expect_release == 42) {
654 iTCO_wdt_stop();
655 } else {
656 printk(KERN_CRIT PFX
657 "Unexpected close, not stopping watchdog!\n");
658 iTCO_wdt_keepalive();
659 }
660 clear_bit(0, &is_active);
661 expect_release = 0;
662 return 0;
663 }
664
665 static ssize_t iTCO_wdt_write(struct file *file, const char __user *data,
666 size_t len, loff_t *ppos)
667 {
668 /* See if we got the magic character 'V' and reload the timer */
669 if (len) {
670 if (!nowayout) {
671 size_t i;
672
673 /* note: just in case someone wrote the magic
674 character five months ago... */
675 expect_release = 0;
676
677 /* scan to see whether or not we got the
678 magic character */
679 for (i = 0; i != len; i++) {
680 char c;
681 if (get_user(c, data + i))
682 return -EFAULT;
683 if (c == 'V')
684 expect_release = 42;
685 }
686 }
687
688 /* someone wrote to us, we should reload the timer */
689 iTCO_wdt_keepalive();
690 }
691 return len;
692 }
693
694 static long iTCO_wdt_ioctl(struct file *file, unsigned int cmd,
695 unsigned long arg)
696 {
697 int new_options, retval = -EINVAL;
698 int new_heartbeat;
699 void __user *argp = (void __user *)arg;
700 int __user *p = argp;
701 static const struct watchdog_info ident = {
702 .options = WDIOF_SETTIMEOUT |
703 WDIOF_KEEPALIVEPING |
704 WDIOF_MAGICCLOSE,
705 .firmware_version = 0,
706 .identity = DRV_NAME,
707 };
708
709 switch (cmd) {
710 case WDIOC_GETSUPPORT:
711 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
712 case WDIOC_GETSTATUS:
713 case WDIOC_GETBOOTSTATUS:
714 return put_user(0, p);
715
716 case WDIOC_SETOPTIONS:
717 {
718 if (get_user(new_options, p))
719 return -EFAULT;
720
721 if (new_options & WDIOS_DISABLECARD) {
722 iTCO_wdt_stop();
723 retval = 0;
724 }
725 if (new_options & WDIOS_ENABLECARD) {
726 iTCO_wdt_keepalive();
727 iTCO_wdt_start();
728 retval = 0;
729 }
730 return retval;
731 }
732 case WDIOC_KEEPALIVE:
733 iTCO_wdt_keepalive();
734 return 0;
735
736 case WDIOC_SETTIMEOUT:
737 {
738 if (get_user(new_heartbeat, p))
739 return -EFAULT;
740 if (iTCO_wdt_set_heartbeat(new_heartbeat))
741 return -EINVAL;
742 iTCO_wdt_keepalive();
743 /* Fall */
744 }
745 case WDIOC_GETTIMEOUT:
746 return put_user(heartbeat, p);
747 case WDIOC_GETTIMELEFT:
748 {
749 int time_left;
750 if (iTCO_wdt_get_timeleft(&time_left))
751 return -EINVAL;
752 return put_user(time_left, p);
753 }
754 default:
755 return -ENOTTY;
756 }
757 }
758
759 /*
760 * Kernel Interfaces
761 */
762
763 static const struct file_operations iTCO_wdt_fops = {
764 .owner = THIS_MODULE,
765 .llseek = no_llseek,
766 .write = iTCO_wdt_write,
767 .unlocked_ioctl = iTCO_wdt_ioctl,
768 .open = iTCO_wdt_open,
769 .release = iTCO_wdt_release,
770 };
771
772 static struct miscdevice iTCO_wdt_miscdev = {
773 .minor = WATCHDOG_MINOR,
774 .name = "watchdog",
775 .fops = &iTCO_wdt_fops,
776 };
777
778 /*
779 * Init & exit routines
780 */
781
782 static int __devinit iTCO_wdt_init(struct pci_dev *pdev,
783 const struct pci_device_id *ent, struct platform_device *dev)
784 {
785 int ret;
786 u32 base_address;
787 unsigned long RCBA;
788 unsigned long val32;
789
790 /*
791 * Find the ACPI/PM base I/O address which is the base
792 * for the TCO registers (TCOBASE=ACPIBASE + 0x60)
793 * ACPIBASE is bits [15:7] from 0x40-0x43
794 */
795 pci_read_config_dword(pdev, 0x40, &base_address);
796 base_address &= 0x0000ff80;
797 if (base_address == 0x00000000) {
798 /* Something's wrong here, ACPIBASE has to be set */
799 printk(KERN_ERR PFX "failed to get TCOBASE address, "
800 "device disabled by hardware/BIOS\n");
801 return -ENODEV;
802 }
803 iTCO_wdt_private.iTCO_version =
804 iTCO_chipset_info[ent->driver_data].iTCO_version;
805 iTCO_wdt_private.ACPIBASE = base_address;
806 iTCO_wdt_private.pdev = pdev;
807
808 /* Get the Memory-Mapped GCS register, we need it for the
809 NO_REBOOT flag (TCO v2). To get access to it you have to
810 read RCBA from PCI Config space 0xf0 and use it as base.
811 GCS = RCBA + ICH6_GCS(0x3410). */
812 if (iTCO_wdt_private.iTCO_version == 2) {
813 pci_read_config_dword(pdev, 0xf0, &base_address);
814 if ((base_address & 1) == 0) {
815 printk(KERN_ERR PFX "RCBA is disabled by hardware"
816 "/BIOS, device disabled\n");
817 ret = -ENODEV;
818 goto out;
819 }
820 RCBA = base_address & 0xffffc000;
821 iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410), 4);
822 }
823
824 /* Check chipset's NO_REBOOT bit */
825 if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
826 printk(KERN_INFO PFX "unable to reset NO_REBOOT flag, "
827 "device disabled by hardware/BIOS\n");
828 ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
829 goto out_unmap;
830 }
831
832 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
833 iTCO_wdt_set_NO_REBOOT_bit();
834
835 /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
836 if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
837 printk(KERN_ERR PFX
838 "I/O address 0x%04lx already in use, "
839 "device disabled\n", SMI_EN);
840 ret = -EIO;
841 goto out_unmap;
842 }
843 /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
844 val32 = inl(SMI_EN);
845 val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
846 outl(val32, SMI_EN);
847
848 /* The TCO I/O registers reside in a 32-byte range pointed to
849 by the TCOBASE value */
850 if (!request_region(TCOBASE, 0x20, "iTCO_wdt")) {
851 printk(KERN_ERR PFX "I/O address 0x%04lx already in use "
852 "device disabled\n", TCOBASE);
853 ret = -EIO;
854 goto unreg_smi_en;
855 }
856
857 printk(KERN_INFO PFX
858 "Found a %s TCO device (Version=%d, TCOBASE=0x%04lx)\n",
859 iTCO_chipset_info[ent->driver_data].name,
860 iTCO_chipset_info[ent->driver_data].iTCO_version,
861 TCOBASE);
862
863 /* Clear out the (probably old) status */
864 outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */
865 outw(0x0002, TCO2_STS); /* Clear SECOND_TO_STS bit */
866 outw(0x0004, TCO2_STS); /* Clear BOOT_STS bit */
867
868 /* Make sure the watchdog is not running */
869 iTCO_wdt_stop();
870
871 /* Check that the heartbeat value is within it's range;
872 if not reset to the default */
873 if (iTCO_wdt_set_heartbeat(heartbeat)) {
874 iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
875 printk(KERN_INFO PFX
876 "timeout value out of range, using %d\n", heartbeat);
877 }
878
879 ret = misc_register(&iTCO_wdt_miscdev);
880 if (ret != 0) {
881 printk(KERN_ERR PFX
882 "cannot register miscdev on minor=%d (err=%d)\n",
883 WATCHDOG_MINOR, ret);
884 goto unreg_region;
885 }
886
887 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
888 heartbeat, nowayout);
889
890 return 0;
891
892 unreg_region:
893 release_region(TCOBASE, 0x20);
894 unreg_smi_en:
895 release_region(SMI_EN, 4);
896 out_unmap:
897 if (iTCO_wdt_private.iTCO_version == 2)
898 iounmap(iTCO_wdt_private.gcs);
899 out:
900 iTCO_wdt_private.ACPIBASE = 0;
901 return ret;
902 }
903
904 static void __devexit iTCO_wdt_cleanup(void)
905 {
906 /* Stop the timer before we leave */
907 if (!nowayout)
908 iTCO_wdt_stop();
909
910 /* Deregister */
911 misc_deregister(&iTCO_wdt_miscdev);
912 release_region(TCOBASE, 0x20);
913 release_region(SMI_EN, 4);
914 if (iTCO_wdt_private.iTCO_version == 2)
915 iounmap(iTCO_wdt_private.gcs);
916 pci_dev_put(iTCO_wdt_private.pdev);
917 iTCO_wdt_private.ACPIBASE = 0;
918 }
919
920 static int __devinit iTCO_wdt_probe(struct platform_device *dev)
921 {
922 int ret = -ENODEV;
923 int found = 0;
924 struct pci_dev *pdev = NULL;
925 const struct pci_device_id *ent;
926
927 spin_lock_init(&iTCO_wdt_private.io_lock);
928
929 for_each_pci_dev(pdev) {
930 ent = pci_match_id(iTCO_wdt_pci_tbl, pdev);
931 if (ent) {
932 found++;
933 ret = iTCO_wdt_init(pdev, ent, dev);
934 if (!ret)
935 break;
936 }
937 }
938
939 if (!found)
940 printk(KERN_INFO PFX "No device detected.\n");
941
942 return ret;
943 }
944
945 static int __devexit iTCO_wdt_remove(struct platform_device *dev)
946 {
947 if (iTCO_wdt_private.ACPIBASE)
948 iTCO_wdt_cleanup();
949
950 return 0;
951 }
952
953 static void iTCO_wdt_shutdown(struct platform_device *dev)
954 {
955 iTCO_wdt_stop();
956 }
957
958 #define iTCO_wdt_suspend NULL
959 #define iTCO_wdt_resume NULL
960
961 static struct platform_driver iTCO_wdt_driver = {
962 .probe = iTCO_wdt_probe,
963 .remove = __devexit_p(iTCO_wdt_remove),
964 .shutdown = iTCO_wdt_shutdown,
965 .suspend = iTCO_wdt_suspend,
966 .resume = iTCO_wdt_resume,
967 .driver = {
968 .owner = THIS_MODULE,
969 .name = DRV_NAME,
970 },
971 };
972
973 static int __init iTCO_wdt_init_module(void)
974 {
975 int err;
976
977 printk(KERN_INFO PFX "Intel TCO WatchDog Timer Driver v%s\n",
978 DRV_VERSION);
979
980 err = platform_driver_register(&iTCO_wdt_driver);
981 if (err)
982 return err;
983
984 iTCO_wdt_platform_device = platform_device_register_simple(DRV_NAME,
985 -1, NULL, 0);
986 if (IS_ERR(iTCO_wdt_platform_device)) {
987 err = PTR_ERR(iTCO_wdt_platform_device);
988 goto unreg_platform_driver;
989 }
990
991 return 0;
992
993 unreg_platform_driver:
994 platform_driver_unregister(&iTCO_wdt_driver);
995 return err;
996 }
997
998 static void __exit iTCO_wdt_cleanup_module(void)
999 {
1000 platform_device_unregister(iTCO_wdt_platform_device);
1001 platform_driver_unregister(&iTCO_wdt_driver);
1002 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
1003 }
1004
1005 module_init(iTCO_wdt_init_module);
1006 module_exit(iTCO_wdt_cleanup_module);
1007
1008 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
1009 MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
1010 MODULE_VERSION(DRV_VERSION);
1011 MODULE_LICENSE("GPL");
1012 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree