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ceph: strip misleading/obsolete version, feature info
[linux-2.6.git] / drivers / watchdog / iTCO_wdt.c
blob69de8713b8e49ccb474e798748e4f0aca59ac9ee
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, 322170-003: 5 Series, 3400 Series (PCH)
33 * document number 320066-003, 320257-008: EP80597 (IICH)
34 * document number TBD : Cougar Point (CPT)
35 */
36
37 /*
38 * Includes, defines, variables, module parameters, ...
39 */
40
41 /* Module and version information */
42 #define DRV_NAME "iTCO_wdt"
43 #define DRV_VERSION "1.06"
44 #define PFX DRV_NAME ": "
45
46 /* Includes */
47 #include <linux/module.h> /* For module specific items */
48 #include <linux/moduleparam.h> /* For new moduleparam's */
49 #include <linux/types.h> /* For standard types (like size_t) */
50 #include <linux/errno.h> /* For the -ENODEV/... values */
51 #include <linux/kernel.h> /* For printk/panic/... */
52 #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
53 (WATCHDOG_MINOR) */
54 #include <linux/watchdog.h> /* For the watchdog specific items */
55 #include <linux/init.h> /* For __init/__exit/... */
56 #include <linux/fs.h> /* For file operations */
57 #include <linux/platform_device.h> /* For platform_driver framework */
58 #include <linux/pci.h> /* For pci functions */
59 #include <linux/ioport.h> /* For io-port access */
60 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
61 #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
62 #include <linux/io.h> /* For inb/outb/... */
63
64 #include "iTCO_vendor.h"
65
66 /* TCO related info */
67 enum iTCO_chipsets {
68 TCO_ICH = 0, /* ICH */
69 TCO_ICH0, /* ICH0 */
70 TCO_ICH2, /* ICH2 */
71 TCO_ICH2M, /* ICH2-M */
72 TCO_ICH3, /* ICH3-S */
73 TCO_ICH3M, /* ICH3-M */
74 TCO_ICH4, /* ICH4 */
75 TCO_ICH4M, /* ICH4-M */
76 TCO_CICH, /* C-ICH */
77 TCO_ICH5, /* ICH5 & ICH5R */
78 TCO_6300ESB, /* 6300ESB */
79 TCO_ICH6, /* ICH6 & ICH6R */
80 TCO_ICH6M, /* ICH6-M */
81 TCO_ICH6W, /* ICH6W & ICH6RW */
82 TCO_631XESB, /* 631xESB/632xESB */
83 TCO_ICH7, /* ICH7 & ICH7R */
84 TCO_ICH7DH, /* ICH7DH */
85 TCO_ICH7M, /* ICH7-M & ICH7-U */
86 TCO_ICH7MDH, /* ICH7-M DH */
87 TCO_ICH8, /* ICH8 & ICH8R */
88 TCO_ICH8DH, /* ICH8DH */
89 TCO_ICH8DO, /* ICH8DO */
90 TCO_ICH8M, /* ICH8M */
91 TCO_ICH8ME, /* ICH8M-E */
92 TCO_ICH9, /* ICH9 */
93 TCO_ICH9R, /* ICH9R */
94 TCO_ICH9DH, /* ICH9DH */
95 TCO_ICH9DO, /* ICH9DO */
96 TCO_ICH9M, /* ICH9M */
97 TCO_ICH9ME, /* ICH9M-E */
98 TCO_ICH10, /* ICH10 */
99 TCO_ICH10R, /* ICH10R */
100 TCO_ICH10D, /* ICH10D */
101 TCO_ICH10DO, /* ICH10DO */
102 TCO_PCH, /* PCH Desktop Full Featured */
103 TCO_PCHM, /* PCH Mobile Full Featured */
104 TCO_P55, /* P55 */
105 TCO_PM55, /* PM55 */
106 TCO_H55, /* H55 */
107 TCO_QM57, /* QM57 */
108 TCO_H57, /* H57 */
109 TCO_HM55, /* HM55 */
110 TCO_Q57, /* Q57 */
111 TCO_HM57, /* HM57 */
112 TCO_PCHMSFF, /* PCH Mobile SFF Full Featured */
113 TCO_QS57, /* QS57 */
114 TCO_3400, /* 3400 */
115 TCO_3420, /* 3420 */
116 TCO_3450, /* 3450 */
117 TCO_EP80579, /* EP80579 */
118 TCO_CPT1, /* Cougar Point */
119 TCO_CPT2, /* Cougar Point Desktop */
120 TCO_CPT3, /* Cougar Point Mobile */
121 TCO_CPT4, /* Cougar Point */
122 TCO_CPT5, /* Cougar Point */
123 TCO_CPT6, /* Cougar Point */
124 TCO_CPT7, /* Cougar Point */
125 TCO_CPT8, /* Cougar Point */
126 TCO_CPT9, /* Cougar Point */
127 TCO_CPT10, /* Cougar Point */
128 TCO_CPT11, /* Cougar Point */
129 TCO_CPT12, /* Cougar Point */
130 TCO_CPT13, /* Cougar Point */
131 TCO_CPT14, /* Cougar Point */
132 TCO_CPT15, /* Cougar Point */
133 TCO_CPT16, /* Cougar Point */
134 TCO_CPT17, /* Cougar Point */
135 TCO_CPT18, /* Cougar Point */
136 TCO_CPT19, /* Cougar Point */
137 TCO_CPT20, /* Cougar Point */
138 TCO_CPT21, /* Cougar Point */
139 TCO_CPT22, /* Cougar Point */
140 TCO_CPT23, /* Cougar Point */
141 TCO_CPT24, /* Cougar Point */
142 TCO_CPT25, /* Cougar Point */
143 TCO_CPT26, /* Cougar Point */
144 TCO_CPT27, /* Cougar Point */
145 TCO_CPT28, /* Cougar Point */
146 TCO_CPT29, /* Cougar Point */
147 TCO_CPT30, /* Cougar Point */
148 TCO_CPT31, /* Cougar Point */
149 };
150
151 static struct {
152 char *name;
153 unsigned int iTCO_version;
154 } iTCO_chipset_info[] __devinitdata = {
155 {"ICH", 1},
156 {"ICH0", 1},
157 {"ICH2", 1},
158 {"ICH2-M", 1},
159 {"ICH3-S", 1},
160 {"ICH3-M", 1},
161 {"ICH4", 1},
162 {"ICH4-M", 1},
163 {"C-ICH", 1},
164 {"ICH5 or ICH5R", 1},
165 {"6300ESB", 1},
166 {"ICH6 or ICH6R", 2},
167 {"ICH6-M", 2},
168 {"ICH6W or ICH6RW", 2},
169 {"631xESB/632xESB", 2},
170 {"ICH7 or ICH7R", 2},
171 {"ICH7DH", 2},
172 {"ICH7-M or ICH7-U", 2},
173 {"ICH7-M DH", 2},
174 {"ICH8 or ICH8R", 2},
175 {"ICH8DH", 2},
176 {"ICH8DO", 2},
177 {"ICH8M", 2},
178 {"ICH8M-E", 2},
179 {"ICH9", 2},
180 {"ICH9R", 2},
181 {"ICH9DH", 2},
182 {"ICH9DO", 2},
183 {"ICH9M", 2},
184 {"ICH9M-E", 2},
185 {"ICH10", 2},
186 {"ICH10R", 2},
187 {"ICH10D", 2},
188 {"ICH10DO", 2},
189 {"PCH Desktop Full Featured", 2},
190 {"PCH Mobile Full Featured", 2},
191 {"P55", 2},
192 {"PM55", 2},
193 {"H55", 2},
194 {"QM57", 2},
195 {"H57", 2},
196 {"HM55", 2},
197 {"Q57", 2},
198 {"HM57", 2},
199 {"PCH Mobile SFF Full Featured", 2},
200 {"QS57", 2},
201 {"3400", 2},
202 {"3420", 2},
203 {"3450", 2},
204 {"EP80579", 2},
205 {"Cougar Point", 2},
206 {"Cougar Point", 2},
207 {"Cougar Point", 2},
208 {"Cougar Point", 2},
209 {"Cougar Point", 2},
210 {"Cougar Point", 2},
211 {"Cougar Point", 2},
212 {"Cougar Point", 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 {NULL, 0}
237 };
238
239 #define ITCO_PCI_DEVICE(dev, data) \
240 .vendor = PCI_VENDOR_ID_INTEL, \
241 .device = dev, \
242 .subvendor = PCI_ANY_ID, \
243 .subdevice = PCI_ANY_ID, \
244 .class = 0, \
245 .class_mask = 0, \
246 .driver_data = data
247
248 /*
249 * This data only exists for exporting the supported PCI ids
250 * via MODULE_DEVICE_TABLE. We do not actually register a
251 * pci_driver, because the I/O Controller Hub has also other
252 * functions that probably will be registered by other drivers.
253 */
254 static struct pci_device_id iTCO_wdt_pci_tbl[] = {
255 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AA_0, TCO_ICH)},
256 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AB_0, TCO_ICH0)},
257 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_0, TCO_ICH2)},
258 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_10, TCO_ICH2M)},
259 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_0, TCO_ICH3)},
260 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_12, TCO_ICH3M)},
261 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_0, TCO_ICH4)},
262 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_12, TCO_ICH4M)},
263 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801E_0, TCO_CICH)},
264 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801EB_0, TCO_ICH5)},
265 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB_1, TCO_6300ESB)},
266 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_0, TCO_ICH6)},
267 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_1, TCO_ICH6M)},
268 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_2, TCO_ICH6W)},
269 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB2_0, TCO_631XESB)},
270 { ITCO_PCI_DEVICE(0x2671, TCO_631XESB)},
271 { ITCO_PCI_DEVICE(0x2672, TCO_631XESB)},
272 { ITCO_PCI_DEVICE(0x2673, TCO_631XESB)},
273 { ITCO_PCI_DEVICE(0x2674, TCO_631XESB)},
274 { ITCO_PCI_DEVICE(0x2675, TCO_631XESB)},
275 { ITCO_PCI_DEVICE(0x2676, TCO_631XESB)},
276 { ITCO_PCI_DEVICE(0x2677, TCO_631XESB)},
277 { ITCO_PCI_DEVICE(0x2678, TCO_631XESB)},
278 { ITCO_PCI_DEVICE(0x2679, TCO_631XESB)},
279 { ITCO_PCI_DEVICE(0x267a, TCO_631XESB)},
280 { ITCO_PCI_DEVICE(0x267b, TCO_631XESB)},
281 { ITCO_PCI_DEVICE(0x267c, TCO_631XESB)},
282 { ITCO_PCI_DEVICE(0x267d, TCO_631XESB)},
283 { ITCO_PCI_DEVICE(0x267e, TCO_631XESB)},
284 { ITCO_PCI_DEVICE(0x267f, TCO_631XESB)},
285 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_0, TCO_ICH7)},
286 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_30, TCO_ICH7DH)},
287 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_1, TCO_ICH7M)},
288 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_31, TCO_ICH7MDH)},
289 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_0, TCO_ICH8)},
290 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_2, TCO_ICH8DH)},
291 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_3, TCO_ICH8DO)},
292 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_4, TCO_ICH8M)},
293 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_1, TCO_ICH8ME)},
294 { ITCO_PCI_DEVICE(0x2918, TCO_ICH9)},
295 { ITCO_PCI_DEVICE(0x2916, TCO_ICH9R)},
296 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_2, TCO_ICH9DH)},
297 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_4, TCO_ICH9DO)},
298 { ITCO_PCI_DEVICE(0x2919, TCO_ICH9M)},
299 { ITCO_PCI_DEVICE(0x2917, TCO_ICH9ME)},
300 { ITCO_PCI_DEVICE(0x3a18, TCO_ICH10)},
301 { ITCO_PCI_DEVICE(0x3a16, TCO_ICH10R)},
302 { ITCO_PCI_DEVICE(0x3a1a, TCO_ICH10D)},
303 { ITCO_PCI_DEVICE(0x3a14, TCO_ICH10DO)},
304 { ITCO_PCI_DEVICE(0x3b00, TCO_PCH)},
305 { ITCO_PCI_DEVICE(0x3b01, TCO_PCHM)},
306 { ITCO_PCI_DEVICE(0x3b02, TCO_P55)},
307 { ITCO_PCI_DEVICE(0x3b03, TCO_PM55)},
308 { ITCO_PCI_DEVICE(0x3b06, TCO_H55)},
309 { ITCO_PCI_DEVICE(0x3b07, TCO_QM57)},
310 { ITCO_PCI_DEVICE(0x3b08, TCO_H57)},
311 { ITCO_PCI_DEVICE(0x3b09, TCO_HM55)},
312 { ITCO_PCI_DEVICE(0x3b0a, TCO_Q57)},
313 { ITCO_PCI_DEVICE(0x3b0b, TCO_HM57)},
314 { ITCO_PCI_DEVICE(0x3b0d, TCO_PCHMSFF)},
315 { ITCO_PCI_DEVICE(0x3b0f, TCO_QS57)},
316 { ITCO_PCI_DEVICE(0x3b12, TCO_3400)},
317 { ITCO_PCI_DEVICE(0x3b14, TCO_3420)},
318 { ITCO_PCI_DEVICE(0x3b16, TCO_3450)},
319 { ITCO_PCI_DEVICE(0x5031, TCO_EP80579)},
320 { ITCO_PCI_DEVICE(0x1c41, TCO_CPT1)},
321 { ITCO_PCI_DEVICE(0x1c42, TCO_CPT2)},
322 { ITCO_PCI_DEVICE(0x1c43, TCO_CPT3)},
323 { ITCO_PCI_DEVICE(0x1c44, TCO_CPT4)},
324 { ITCO_PCI_DEVICE(0x1c45, TCO_CPT5)},
325 { ITCO_PCI_DEVICE(0x1c46, TCO_CPT6)},
326 { ITCO_PCI_DEVICE(0x1c47, TCO_CPT7)},
327 { ITCO_PCI_DEVICE(0x1c48, TCO_CPT8)},
328 { ITCO_PCI_DEVICE(0x1c49, TCO_CPT9)},
329 { ITCO_PCI_DEVICE(0x1c4a, TCO_CPT10)},
330 { ITCO_PCI_DEVICE(0x1c4b, TCO_CPT11)},
331 { ITCO_PCI_DEVICE(0x1c4c, TCO_CPT12)},
332 { ITCO_PCI_DEVICE(0x1c4d, TCO_CPT13)},
333 { ITCO_PCI_DEVICE(0x1c4e, TCO_CPT14)},
334 { ITCO_PCI_DEVICE(0x1c4f, TCO_CPT15)},
335 { ITCO_PCI_DEVICE(0x1c50, TCO_CPT16)},
336 { ITCO_PCI_DEVICE(0x1c51, TCO_CPT17)},
337 { ITCO_PCI_DEVICE(0x1c52, TCO_CPT18)},
338 { ITCO_PCI_DEVICE(0x1c53, TCO_CPT19)},
339 { ITCO_PCI_DEVICE(0x1c54, TCO_CPT20)},
340 { ITCO_PCI_DEVICE(0x1c55, TCO_CPT21)},
341 { ITCO_PCI_DEVICE(0x1c56, TCO_CPT22)},
342 { ITCO_PCI_DEVICE(0x1c57, TCO_CPT23)},
343 { ITCO_PCI_DEVICE(0x1c58, TCO_CPT24)},
344 { ITCO_PCI_DEVICE(0x1c59, TCO_CPT25)},
345 { ITCO_PCI_DEVICE(0x1c5a, TCO_CPT26)},
346 { ITCO_PCI_DEVICE(0x1c5b, TCO_CPT27)},
347 { ITCO_PCI_DEVICE(0x1c5c, TCO_CPT28)},
348 { ITCO_PCI_DEVICE(0x1c5d, TCO_CPT29)},
349 { ITCO_PCI_DEVICE(0x1c5e, TCO_CPT30)},
350 { ITCO_PCI_DEVICE(0x1c5f, TCO_CPT31)},
351 { 0, }, /* End of list */
352 };
353 MODULE_DEVICE_TABLE(pci, iTCO_wdt_pci_tbl);
354
355 /* Address definitions for the TCO */
356 /* TCO base address */
357 #define TCOBASE (iTCO_wdt_private.ACPIBASE + 0x60)
358 /* SMI Control and Enable Register */
359 #define SMI_EN (iTCO_wdt_private.ACPIBASE + 0x30)
360
361 #define TCO_RLD (TCOBASE + 0x00) /* TCO Timer Reload and Curr. Value */
362 #define TCOv1_TMR (TCOBASE + 0x01) /* TCOv1 Timer Initial Value */
363 #define TCO_DAT_IN (TCOBASE + 0x02) /* TCO Data In Register */
364 #define TCO_DAT_OUT (TCOBASE + 0x03) /* TCO Data Out Register */
365 #define TCO1_STS (TCOBASE + 0x04) /* TCO1 Status Register */
366 #define TCO2_STS (TCOBASE + 0x06) /* TCO2 Status Register */
367 #define TCO1_CNT (TCOBASE + 0x08) /* TCO1 Control Register */
368 #define TCO2_CNT (TCOBASE + 0x0a) /* TCO2 Control Register */
369 #define TCOv2_TMR (TCOBASE + 0x12) /* TCOv2 Timer Initial Value */
370
371 /* internal variables */
372 static unsigned long is_active;
373 static char expect_release;
374 static struct { /* this is private data for the iTCO_wdt device */
375 /* TCO version/generation */
376 unsigned int iTCO_version;
377 /* The cards ACPIBASE address (TCOBASE = ACPIBASE+0x60) */
378 unsigned long ACPIBASE;
379 /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2)*/
380 unsigned long __iomem *gcs;
381 /* the lock for io operations */
382 spinlock_t io_lock;
383 /* the PCI-device */
384 struct pci_dev *pdev;
385 } iTCO_wdt_private;
386
387 /* the watchdog platform device */
388 static struct platform_device *iTCO_wdt_platform_device;
389
390 /* module parameters */
391 #define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */
392 static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
393 module_param(heartbeat, int, 0);
394 MODULE_PARM_DESC(heartbeat, "Watchdog timeout in seconds. "
395 "5..76 (TCO v1) or 3..614 (TCO v2), default="
396 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
397
398 static int nowayout = WATCHDOG_NOWAYOUT;
399 module_param(nowayout, int, 0);
400 MODULE_PARM_DESC(nowayout,
401 "Watchdog cannot be stopped once started (default="
402 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
403
404 /*
405 * Some TCO specific functions
406 */
407
408 static inline unsigned int seconds_to_ticks(int seconds)
409 {
410 /* the internal timer is stored as ticks which decrement
411 * every 0.6 seconds */
412 return (seconds * 10) / 6;
413 }
414
415 static void iTCO_wdt_set_NO_REBOOT_bit(void)
416 {
417 u32 val32;
418
419 /* Set the NO_REBOOT bit: this disables reboots */
420 if (iTCO_wdt_private.iTCO_version == 2) {
421 val32 = readl(iTCO_wdt_private.gcs);
422 val32 |= 0x00000020;
423 writel(val32, iTCO_wdt_private.gcs);
424 } else if (iTCO_wdt_private.iTCO_version == 1) {
425 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
426 val32 |= 0x00000002;
427 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
428 }
429 }
430
431 static int iTCO_wdt_unset_NO_REBOOT_bit(void)
432 {
433 int ret = 0;
434 u32 val32;
435
436 /* Unset the NO_REBOOT bit: this enables reboots */
437 if (iTCO_wdt_private.iTCO_version == 2) {
438 val32 = readl(iTCO_wdt_private.gcs);
439 val32 &= 0xffffffdf;
440 writel(val32, iTCO_wdt_private.gcs);
441
442 val32 = readl(iTCO_wdt_private.gcs);
443 if (val32 & 0x00000020)
444 ret = -EIO;
445 } else if (iTCO_wdt_private.iTCO_version == 1) {
446 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
447 val32 &= 0xfffffffd;
448 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
449
450 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
451 if (val32 & 0x00000002)
452 ret = -EIO;
453 }
454
455 return ret; /* returns: 0 = OK, -EIO = Error */
456 }
457
458 static int iTCO_wdt_start(void)
459 {
460 unsigned int val;
461
462 spin_lock(&iTCO_wdt_private.io_lock);
463
464 iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat);
465
466 /* disable chipset's NO_REBOOT bit */
467 if (iTCO_wdt_unset_NO_REBOOT_bit()) {
468 spin_unlock(&iTCO_wdt_private.io_lock);
469 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, "
470 "reboot disabled by hardware\n");
471 return -EIO;
472 }
473
474 /* Force the timer to its reload value by writing to the TCO_RLD
475 register */
476 if (iTCO_wdt_private.iTCO_version == 2)
477 outw(0x01, TCO_RLD);
478 else if (iTCO_wdt_private.iTCO_version == 1)
479 outb(0x01, TCO_RLD);
480
481 /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
482 val = inw(TCO1_CNT);
483 val &= 0xf7ff;
484 outw(val, TCO1_CNT);
485 val = inw(TCO1_CNT);
486 spin_unlock(&iTCO_wdt_private.io_lock);
487
488 if (val & 0x0800)
489 return -1;
490 return 0;
491 }
492
493 static int iTCO_wdt_stop(void)
494 {
495 unsigned int val;
496
497 spin_lock(&iTCO_wdt_private.io_lock);
498
499 iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE);
500
501 /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
502 val = inw(TCO1_CNT);
503 val |= 0x0800;
504 outw(val, TCO1_CNT);
505 val = inw(TCO1_CNT);
506
507 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
508 iTCO_wdt_set_NO_REBOOT_bit();
509
510 spin_unlock(&iTCO_wdt_private.io_lock);
511
512 if ((val & 0x0800) == 0)
513 return -1;
514 return 0;
515 }
516
517 static int iTCO_wdt_keepalive(void)
518 {
519 spin_lock(&iTCO_wdt_private.io_lock);
520
521 iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat);
522
523 /* Reload the timer by writing to the TCO Timer Counter register */
524 if (iTCO_wdt_private.iTCO_version == 2)
525 outw(0x01, TCO_RLD);
526 else if (iTCO_wdt_private.iTCO_version == 1) {
527 /* Reset the timeout status bit so that the timer
528 * needs to count down twice again before rebooting */
529 outw(0x0008, TCO1_STS); /* write 1 to clear bit */
530
531 outb(0x01, TCO_RLD);
532 }
533
534 spin_unlock(&iTCO_wdt_private.io_lock);
535 return 0;
536 }
537
538 static int iTCO_wdt_set_heartbeat(int t)
539 {
540 unsigned int val16;
541 unsigned char val8;
542 unsigned int tmrval;
543
544 tmrval = seconds_to_ticks(t);
545
546 /* For TCO v1 the timer counts down twice before rebooting */
547 if (iTCO_wdt_private.iTCO_version == 1)
548 tmrval /= 2;
549
550 /* from the specs: */
551 /* "Values of 0h-3h are ignored and should not be attempted" */
552 if (tmrval < 0x04)
553 return -EINVAL;
554 if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) ||
555 ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
556 return -EINVAL;
557
558 iTCO_vendor_pre_set_heartbeat(tmrval);
559
560 /* Write new heartbeat to watchdog */
561 if (iTCO_wdt_private.iTCO_version == 2) {
562 spin_lock(&iTCO_wdt_private.io_lock);
563 val16 = inw(TCOv2_TMR);
564 val16 &= 0xfc00;
565 val16 |= tmrval;
566 outw(val16, TCOv2_TMR);
567 val16 = inw(TCOv2_TMR);
568 spin_unlock(&iTCO_wdt_private.io_lock);
569
570 if ((val16 & 0x3ff) != tmrval)
571 return -EINVAL;
572 } else if (iTCO_wdt_private.iTCO_version == 1) {
573 spin_lock(&iTCO_wdt_private.io_lock);
574 val8 = inb(TCOv1_TMR);
575 val8 &= 0xc0;
576 val8 |= (tmrval & 0xff);
577 outb(val8, TCOv1_TMR);
578 val8 = inb(TCOv1_TMR);
579 spin_unlock(&iTCO_wdt_private.io_lock);
580
581 if ((val8 & 0x3f) != tmrval)
582 return -EINVAL;
583 }
584
585 heartbeat = t;
586 return 0;
587 }
588
589 static int iTCO_wdt_get_timeleft(int *time_left)
590 {
591 unsigned int val16;
592 unsigned char val8;
593
594 /* read the TCO Timer */
595 if (iTCO_wdt_private.iTCO_version == 2) {
596 spin_lock(&iTCO_wdt_private.io_lock);
597 val16 = inw(TCO_RLD);
598 val16 &= 0x3ff;
599 spin_unlock(&iTCO_wdt_private.io_lock);
600
601 *time_left = (val16 * 6) / 10;
602 } else if (iTCO_wdt_private.iTCO_version == 1) {
603 spin_lock(&iTCO_wdt_private.io_lock);
604 val8 = inb(TCO_RLD);
605 val8 &= 0x3f;
606 if (!(inw(TCO1_STS) & 0x0008))
607 val8 += (inb(TCOv1_TMR) & 0x3f);
608 spin_unlock(&iTCO_wdt_private.io_lock);
609
610 *time_left = (val8 * 6) / 10;
611 } else
612 return -EINVAL;
613 return 0;
614 }
615
616 /*
617 * /dev/watchdog handling
618 */
619
620 static int iTCO_wdt_open(struct inode *inode, struct file *file)
621 {
622 /* /dev/watchdog can only be opened once */
623 if (test_and_set_bit(0, &is_active))
624 return -EBUSY;
625
626 /*
627 * Reload and activate timer
628 */
629 iTCO_wdt_start();
630 return nonseekable_open(inode, file);
631 }
632
633 static int iTCO_wdt_release(struct inode *inode, struct file *file)
634 {
635 /*
636 * Shut off the timer.
637 */
638 if (expect_release == 42) {
639 iTCO_wdt_stop();
640 } else {
641 printk(KERN_CRIT PFX
642 "Unexpected close, not stopping watchdog!\n");
643 iTCO_wdt_keepalive();
644 }
645 clear_bit(0, &is_active);
646 expect_release = 0;
647 return 0;
648 }
649
650 static ssize_t iTCO_wdt_write(struct file *file, const char __user *data,
651 size_t len, loff_t *ppos)
652 {
653 /* See if we got the magic character 'V' and reload the timer */
654 if (len) {
655 if (!nowayout) {
656 size_t i;
657
658 /* note: just in case someone wrote the magic
659 character five months ago... */
660 expect_release = 0;
661
662 /* scan to see whether or not we got the
663 magic character */
664 for (i = 0; i != len; i++) {
665 char c;
666 if (get_user(c, data + i))
667 return -EFAULT;
668 if (c == 'V')
669 expect_release = 42;
670 }
671 }
672
673 /* someone wrote to us, we should reload the timer */
674 iTCO_wdt_keepalive();
675 }
676 return len;
677 }
678
679 static long iTCO_wdt_ioctl(struct file *file, unsigned int cmd,
680 unsigned long arg)
681 {
682 int new_options, retval = -EINVAL;
683 int new_heartbeat;
684 void __user *argp = (void __user *)arg;
685 int __user *p = argp;
686 static const struct watchdog_info ident = {
687 .options = WDIOF_SETTIMEOUT |
688 WDIOF_KEEPALIVEPING |
689 WDIOF_MAGICCLOSE,
690 .firmware_version = 0,
691 .identity = DRV_NAME,
692 };
693
694 switch (cmd) {
695 case WDIOC_GETSUPPORT:
696 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
697 case WDIOC_GETSTATUS:
698 case WDIOC_GETBOOTSTATUS:
699 return put_user(0, p);
700
701 case WDIOC_SETOPTIONS:
702 {
703 if (get_user(new_options, p))
704 return -EFAULT;
705
706 if (new_options & WDIOS_DISABLECARD) {
707 iTCO_wdt_stop();
708 retval = 0;
709 }
710 if (new_options & WDIOS_ENABLECARD) {
711 iTCO_wdt_keepalive();
712 iTCO_wdt_start();
713 retval = 0;
714 }
715 return retval;
716 }
717 case WDIOC_KEEPALIVE:
718 iTCO_wdt_keepalive();
719 return 0;
720
721 case WDIOC_SETTIMEOUT:
722 {
723 if (get_user(new_heartbeat, p))
724 return -EFAULT;
725 if (iTCO_wdt_set_heartbeat(new_heartbeat))
726 return -EINVAL;
727 iTCO_wdt_keepalive();
728 /* Fall */
729 }
730 case WDIOC_GETTIMEOUT:
731 return put_user(heartbeat, p);
732 case WDIOC_GETTIMELEFT:
733 {
734 int time_left;
735 if (iTCO_wdt_get_timeleft(&time_left))
736 return -EINVAL;
737 return put_user(time_left, p);
738 }
739 default:
740 return -ENOTTY;
741 }
742 }
743
744 /*
745 * Kernel Interfaces
746 */
747
748 static const struct file_operations iTCO_wdt_fops = {
749 .owner = THIS_MODULE,
750 .llseek = no_llseek,
751 .write = iTCO_wdt_write,
752 .unlocked_ioctl = iTCO_wdt_ioctl,
753 .open = iTCO_wdt_open,
754 .release = iTCO_wdt_release,
755 };
756
757 static struct miscdevice iTCO_wdt_miscdev = {
758 .minor = WATCHDOG_MINOR,
759 .name = "watchdog",
760 .fops = &iTCO_wdt_fops,
761 };
762
763 /*
764 * Init & exit routines
765 */
766
767 static int __devinit iTCO_wdt_init(struct pci_dev *pdev,
768 const struct pci_device_id *ent, struct platform_device *dev)
769 {
770 int ret;
771 u32 base_address;
772 unsigned long RCBA;
773 unsigned long val32;
774
775 /*
776 * Find the ACPI/PM base I/O address which is the base
777 * for the TCO registers (TCOBASE=ACPIBASE + 0x60)
778 * ACPIBASE is bits [15:7] from 0x40-0x43
779 */
780 pci_read_config_dword(pdev, 0x40, &base_address);
781 base_address &= 0x0000ff80;
782 if (base_address == 0x00000000) {
783 /* Something's wrong here, ACPIBASE has to be set */
784 printk(KERN_ERR PFX "failed to get TCOBASE address\n");
785 pci_dev_put(pdev);
786 return -ENODEV;
787 }
788 iTCO_wdt_private.iTCO_version =
789 iTCO_chipset_info[ent->driver_data].iTCO_version;
790 iTCO_wdt_private.ACPIBASE = base_address;
791 iTCO_wdt_private.pdev = pdev;
792
793 /* Get the Memory-Mapped GCS register, we need it for the
794 NO_REBOOT flag (TCO v2). To get access to it you have to
795 read RCBA from PCI Config space 0xf0 and use it as base.
796 GCS = RCBA + ICH6_GCS(0x3410). */
797 if (iTCO_wdt_private.iTCO_version == 2) {
798 pci_read_config_dword(pdev, 0xf0, &base_address);
799 if ((base_address & 1) == 0) {
800 printk(KERN_ERR PFX "RCBA is disabled by hardware\n");
801 ret = -ENODEV;
802 goto out;
803 }
804 RCBA = base_address & 0xffffc000;
805 iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410), 4);
806 }
807
808 /* Check chipset's NO_REBOOT bit */
809 if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
810 printk(KERN_INFO PFX "unable to reset NO_REBOOT flag, "
811 "platform may have disabled it\n");
812 ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
813 goto out_unmap;
814 }
815
816 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
817 iTCO_wdt_set_NO_REBOOT_bit();
818
819 /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
820 if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
821 printk(KERN_ERR PFX
822 "I/O address 0x%04lx already in use\n", SMI_EN);
823 ret = -EIO;
824 goto out_unmap;
825 }
826 /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
827 val32 = inl(SMI_EN);
828 val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
829 outl(val32, SMI_EN);
830
831 /* The TCO I/O registers reside in a 32-byte range pointed to
832 by the TCOBASE value */
833 if (!request_region(TCOBASE, 0x20, "iTCO_wdt")) {
834 printk(KERN_ERR PFX "I/O address 0x%04lx already in use\n",
835 TCOBASE);
836 ret = -EIO;
837 goto unreg_smi_en;
838 }
839
840 printk(KERN_INFO PFX
841 "Found a %s TCO device (Version=%d, TCOBASE=0x%04lx)\n",
842 iTCO_chipset_info[ent->driver_data].name,
843 iTCO_chipset_info[ent->driver_data].iTCO_version,
844 TCOBASE);
845
846 /* Clear out the (probably old) status */
847 outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */
848 outw(0x0002, TCO2_STS); /* Clear SECOND_TO_STS bit */
849 outw(0x0004, TCO2_STS); /* Clear BOOT_STS bit */
850
851 /* Make sure the watchdog is not running */
852 iTCO_wdt_stop();
853
854 /* Check that the heartbeat value is within it's range;
855 if not reset to the default */
856 if (iTCO_wdt_set_heartbeat(heartbeat)) {
857 iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
858 printk(KERN_INFO PFX
859 "timeout value out of range, using %d\n", heartbeat);
860 }
861
862 ret = misc_register(&iTCO_wdt_miscdev);
863 if (ret != 0) {
864 printk(KERN_ERR PFX
865 "cannot register miscdev on minor=%d (err=%d)\n",
866 WATCHDOG_MINOR, ret);
867 goto unreg_region;
868 }
869
870 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
871 heartbeat, nowayout);
872
873 return 0;
874
875 unreg_region:
876 release_region(TCOBASE, 0x20);
877 unreg_smi_en:
878 release_region(SMI_EN, 4);
879 out_unmap:
880 if (iTCO_wdt_private.iTCO_version == 2)
881 iounmap(iTCO_wdt_private.gcs);
882 out:
883 pci_dev_put(iTCO_wdt_private.pdev);
884 iTCO_wdt_private.ACPIBASE = 0;
885 return ret;
886 }
887
888 static void __devexit iTCO_wdt_cleanup(void)
889 {
890 /* Stop the timer before we leave */
891 if (!nowayout)
892 iTCO_wdt_stop();
893
894 /* Deregister */
895 misc_deregister(&iTCO_wdt_miscdev);
896 release_region(TCOBASE, 0x20);
897 release_region(SMI_EN, 4);
898 if (iTCO_wdt_private.iTCO_version == 2)
899 iounmap(iTCO_wdt_private.gcs);
900 pci_dev_put(iTCO_wdt_private.pdev);
901 iTCO_wdt_private.ACPIBASE = 0;
902 }
903
904 static int __devinit iTCO_wdt_probe(struct platform_device *dev)
905 {
906 int ret = -ENODEV;
907 int found = 0;
908 struct pci_dev *pdev = NULL;
909 const struct pci_device_id *ent;
910
911 spin_lock_init(&iTCO_wdt_private.io_lock);
912
913 for_each_pci_dev(pdev) {
914 ent = pci_match_id(iTCO_wdt_pci_tbl, pdev);
915 if (ent) {
916 found++;
917 ret = iTCO_wdt_init(pdev, ent, dev);
918 if (!ret)
919 break;
920 }
921 }
922
923 if (!found)
924 printk(KERN_INFO PFX "No card detected\n");
925
926 return ret;
927 }
928
929 static int __devexit iTCO_wdt_remove(struct platform_device *dev)
930 {
931 if (iTCO_wdt_private.ACPIBASE)
932 iTCO_wdt_cleanup();
933
934 return 0;
935 }
936
937 static void iTCO_wdt_shutdown(struct platform_device *dev)
938 {
939 iTCO_wdt_stop();
940 }
941
942 #define iTCO_wdt_suspend NULL
943 #define iTCO_wdt_resume NULL
944
945 static struct platform_driver iTCO_wdt_driver = {
946 .probe = iTCO_wdt_probe,
947 .remove = __devexit_p(iTCO_wdt_remove),
948 .shutdown = iTCO_wdt_shutdown,
949 .suspend = iTCO_wdt_suspend,
950 .resume = iTCO_wdt_resume,
951 .driver = {
952 .owner = THIS_MODULE,
953 .name = DRV_NAME,
954 },
955 };
956
957 static int __init iTCO_wdt_init_module(void)
958 {
959 int err;
960
961 printk(KERN_INFO PFX "Intel TCO WatchDog Timer Driver v%s\n",
962 DRV_VERSION);
963
964 err = platform_driver_register(&iTCO_wdt_driver);
965 if (err)
966 return err;
967
968 iTCO_wdt_platform_device = platform_device_register_simple(DRV_NAME,
969 -1, NULL, 0);
970 if (IS_ERR(iTCO_wdt_platform_device)) {
971 err = PTR_ERR(iTCO_wdt_platform_device);
972 goto unreg_platform_driver;
973 }
974
975 return 0;
976
977 unreg_platform_driver:
978 platform_driver_unregister(&iTCO_wdt_driver);
979 return err;
980 }
981
982 static void __exit iTCO_wdt_cleanup_module(void)
983 {
984 platform_device_unregister(iTCO_wdt_platform_device);
985 platform_driver_unregister(&iTCO_wdt_driver);
986 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
987 }
988
989 module_init(iTCO_wdt_init_module);
990 module_exit(iTCO_wdt_cleanup_module);
991
992 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
993 MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
994 MODULE_VERSION(DRV_VERSION);
995 MODULE_LICENSE("GPL");
996 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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