1 /*
2 * intel TCO Watchdog Driver
3 *
4 * (c) Copyright 2006-2011 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 * document number TBD : Panther Point
39 * document number TBD : Lynx Point
40 */
41
42 /*
43 * Includes, defines, variables, module parameters, ...
44 */
45
46 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
47
48 /* Module and version information */
49 #define DRV_NAME "iTCO_wdt"
50 #define DRV_VERSION "1.07"
51
52 /* Includes */
53 #include <linux/module.h> /* For module specific items */
54 #include <linux/moduleparam.h> /* For new moduleparam's */
55 #include <linux/types.h> /* For standard types (like size_t) */
56 #include <linux/errno.h> /* For the -ENODEV/... values */
57 #include <linux/kernel.h> /* For printk/panic/... */
58 #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
59 (WATCHDOG_MINOR) */
60 #include <linux/watchdog.h> /* For the watchdog specific items */
61 #include <linux/init.h> /* For __init/__exit/... */
62 #include <linux/fs.h> /* For file operations */
63 #include <linux/platform_device.h> /* For platform_driver framework */
64 #include <linux/pci.h> /* For pci functions */
65 #include <linux/ioport.h> /* For io-port access */
66 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
67 #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
68 #include <linux/io.h> /* For inb/outb/... */
69
70 #include "iTCO_vendor.h"
71
72 /* TCO related info */
73 enum iTCO_chipsets {
74 TCO_ICH = 0, /* ICH */
75 TCO_ICH0, /* ICH0 */
76 TCO_ICH2, /* ICH2 */
77 TCO_ICH2M, /* ICH2-M */
78 TCO_ICH3, /* ICH3-S */
79 TCO_ICH3M, /* ICH3-M */
80 TCO_ICH4, /* ICH4 */
81 TCO_ICH4M, /* ICH4-M */
82 TCO_CICH, /* C-ICH */
83 TCO_ICH5, /* ICH5 & ICH5R */
84 TCO_6300ESB, /* 6300ESB */
85 TCO_ICH6, /* ICH6 & ICH6R */
86 TCO_ICH6M, /* ICH6-M */
87 TCO_ICH6W, /* ICH6W & ICH6RW */
88 TCO_631XESB, /* 631xESB/632xESB */
89 TCO_ICH7, /* ICH7 & ICH7R */
90 TCO_ICH7DH, /* ICH7DH */
91 TCO_ICH7M, /* ICH7-M & ICH7-U */
92 TCO_ICH7MDH, /* ICH7-M DH */
93 TCO_NM10, /* NM10 */
94 TCO_ICH8, /* ICH8 & ICH8R */
95 TCO_ICH8DH, /* ICH8DH */
96 TCO_ICH8DO, /* ICH8DO */
97 TCO_ICH8M, /* ICH8M */
98 TCO_ICH8ME, /* ICH8M-E */
99 TCO_ICH9, /* ICH9 */
100 TCO_ICH9R, /* ICH9R */
101 TCO_ICH9DH, /* ICH9DH */
102 TCO_ICH9DO, /* ICH9DO */
103 TCO_ICH9M, /* ICH9M */
104 TCO_ICH9ME, /* ICH9M-E */
105 TCO_ICH10, /* ICH10 */
106 TCO_ICH10R, /* ICH10R */
107 TCO_ICH10D, /* ICH10D */
108 TCO_ICH10DO, /* ICH10DO */
109 TCO_PCH, /* PCH Desktop Full Featured */
110 TCO_PCHM, /* PCH Mobile Full Featured */
111 TCO_P55, /* P55 */
112 TCO_PM55, /* PM55 */
113 TCO_H55, /* H55 */
114 TCO_QM57, /* QM57 */
115 TCO_H57, /* H57 */
116 TCO_HM55, /* HM55 */
117 TCO_Q57, /* Q57 */
118 TCO_HM57, /* HM57 */
119 TCO_PCHMSFF, /* PCH Mobile SFF Full Featured */
120 TCO_QS57, /* QS57 */
121 TCO_3400, /* 3400 */
122 TCO_3420, /* 3420 */
123 TCO_3450, /* 3450 */
124 TCO_EP80579, /* EP80579 */
125 TCO_CPT, /* Cougar Point */
126 TCO_CPTD, /* Cougar Point Desktop */
127 TCO_CPTM, /* Cougar Point Mobile */
128 TCO_PBG, /* Patsburg */
129 TCO_DH89XXCC, /* DH89xxCC */
130 TCO_PPT, /* Panther Point */
131 TCO_LPT, /* Lynx Point */
132 };
133
134 static struct {
135 char *name;
136 unsigned int iTCO_version;
137 } iTCO_chipset_info[] __devinitdata = {
138 {"ICH", 1},
139 {"ICH0", 1},
140 {"ICH2", 1},
141 {"ICH2-M", 1},
142 {"ICH3-S", 1},
143 {"ICH3-M", 1},
144 {"ICH4", 1},
145 {"ICH4-M", 1},
146 {"C-ICH", 1},
147 {"ICH5 or ICH5R", 1},
148 {"6300ESB", 1},
149 {"ICH6 or ICH6R", 2},
150 {"ICH6-M", 2},
151 {"ICH6W or ICH6RW", 2},
152 {"631xESB/632xESB", 2},
153 {"ICH7 or ICH7R", 2},
154 {"ICH7DH", 2},
155 {"ICH7-M or ICH7-U", 2},
156 {"ICH7-M DH", 2},
157 {"NM10", 2},
158 {"ICH8 or ICH8R", 2},
159 {"ICH8DH", 2},
160 {"ICH8DO", 2},
161 {"ICH8M", 2},
162 {"ICH8M-E", 2},
163 {"ICH9", 2},
164 {"ICH9R", 2},
165 {"ICH9DH", 2},
166 {"ICH9DO", 2},
167 {"ICH9M", 2},
168 {"ICH9M-E", 2},
169 {"ICH10", 2},
170 {"ICH10R", 2},
171 {"ICH10D", 2},
172 {"ICH10DO", 2},
173 {"PCH Desktop Full Featured", 2},
174 {"PCH Mobile Full Featured", 2},
175 {"P55", 2},
176 {"PM55", 2},
177 {"H55", 2},
178 {"QM57", 2},
179 {"H57", 2},
180 {"HM55", 2},
181 {"Q57", 2},
182 {"HM57", 2},
183 {"PCH Mobile SFF Full Featured", 2},
184 {"QS57", 2},
185 {"3400", 2},
186 {"3420", 2},
187 {"3450", 2},
188 {"EP80579", 2},
189 {"Cougar Point", 2},
190 {"Cougar Point Desktop", 2},
191 {"Cougar Point Mobile", 2},
192 {"Patsburg", 2},
193 {"DH89xxCC", 2},
194 {"Panther Point", 2},
195 {"Lynx Point", 2},
196 {NULL, 0}
197 };
198
199 /*
200 * This data only exists for exporting the supported PCI ids
201 * via MODULE_DEVICE_TABLE. We do not actually register a
202 * pci_driver, because the I/O Controller Hub has also other
203 * functions that probably will be registered by other drivers.
204 */
205 static DEFINE_PCI_DEVICE_TABLE(iTCO_wdt_pci_tbl) = {
206 { PCI_VDEVICE(INTEL, 0x2410), TCO_ICH},
207 { PCI_VDEVICE(INTEL, 0x2420), TCO_ICH0},
208 { PCI_VDEVICE(INTEL, 0x2440), TCO_ICH2},
209 { PCI_VDEVICE(INTEL, 0x244c), TCO_ICH2M},
210 { PCI_VDEVICE(INTEL, 0x2480), TCO_ICH3},
211 { PCI_VDEVICE(INTEL, 0x248c), TCO_ICH3M},
212 { PCI_VDEVICE(INTEL, 0x24c0), TCO_ICH4},
213 { PCI_VDEVICE(INTEL, 0x24cc), TCO_ICH4M},
214 { PCI_VDEVICE(INTEL, 0x2450), TCO_CICH},
215 { PCI_VDEVICE(INTEL, 0x24d0), TCO_ICH5},
216 { PCI_VDEVICE(INTEL, 0x25a1), TCO_6300ESB},
217 { PCI_VDEVICE(INTEL, 0x2640), TCO_ICH6},
218 { PCI_VDEVICE(INTEL, 0x2641), TCO_ICH6M},
219 { PCI_VDEVICE(INTEL, 0x2642), TCO_ICH6W},
220 { PCI_VDEVICE(INTEL, 0x2670), TCO_631XESB},
221 { PCI_VDEVICE(INTEL, 0x2671), TCO_631XESB},
222 { PCI_VDEVICE(INTEL, 0x2672), TCO_631XESB},
223 { PCI_VDEVICE(INTEL, 0x2673), TCO_631XESB},
224 { PCI_VDEVICE(INTEL, 0x2674), TCO_631XESB},
225 { PCI_VDEVICE(INTEL, 0x2675), TCO_631XESB},
226 { PCI_VDEVICE(INTEL, 0x2676), TCO_631XESB},
227 { PCI_VDEVICE(INTEL, 0x2677), TCO_631XESB},
228 { PCI_VDEVICE(INTEL, 0x2678), TCO_631XESB},
229 { PCI_VDEVICE(INTEL, 0x2679), TCO_631XESB},
230 { PCI_VDEVICE(INTEL, 0x267a), TCO_631XESB},
231 { PCI_VDEVICE(INTEL, 0x267b), TCO_631XESB},
232 { PCI_VDEVICE(INTEL, 0x267c), TCO_631XESB},
233 { PCI_VDEVICE(INTEL, 0x267d), TCO_631XESB},
234 { PCI_VDEVICE(INTEL, 0x267e), TCO_631XESB},
235 { PCI_VDEVICE(INTEL, 0x267f), TCO_631XESB},
236 { PCI_VDEVICE(INTEL, 0x27b8), TCO_ICH7},
237 { PCI_VDEVICE(INTEL, 0x27b0), TCO_ICH7DH},
238 { PCI_VDEVICE(INTEL, 0x27b9), TCO_ICH7M},
239 { PCI_VDEVICE(INTEL, 0x27bd), TCO_ICH7MDH},
240 { PCI_VDEVICE(INTEL, 0x27bc), TCO_NM10},
241 { PCI_VDEVICE(INTEL, 0x2810), TCO_ICH8},
242 { PCI_VDEVICE(INTEL, 0x2812), TCO_ICH8DH},
243 { PCI_VDEVICE(INTEL, 0x2814), TCO_ICH8DO},
244 { PCI_VDEVICE(INTEL, 0x2815), TCO_ICH8M},
245 { PCI_VDEVICE(INTEL, 0x2811), TCO_ICH8ME},
246 { PCI_VDEVICE(INTEL, 0x2918), TCO_ICH9},
247 { PCI_VDEVICE(INTEL, 0x2916), TCO_ICH9R},
248 { PCI_VDEVICE(INTEL, 0x2912), TCO_ICH9DH},
249 { PCI_VDEVICE(INTEL, 0x2914), TCO_ICH9DO},
250 { PCI_VDEVICE(INTEL, 0x2919), TCO_ICH9M},
251 { PCI_VDEVICE(INTEL, 0x2917), TCO_ICH9ME},
252 { PCI_VDEVICE(INTEL, 0x3a18), TCO_ICH10},
253 { PCI_VDEVICE(INTEL, 0x3a16), TCO_ICH10R},
254 { PCI_VDEVICE(INTEL, 0x3a1a), TCO_ICH10D},
255 { PCI_VDEVICE(INTEL, 0x3a14), TCO_ICH10DO},
256 { PCI_VDEVICE(INTEL, 0x3b00), TCO_PCH},
257 { PCI_VDEVICE(INTEL, 0x3b01), TCO_PCHM},
258 { PCI_VDEVICE(INTEL, 0x3b02), TCO_P55},
259 { PCI_VDEVICE(INTEL, 0x3b03), TCO_PM55},
260 { PCI_VDEVICE(INTEL, 0x3b06), TCO_H55},
261 { PCI_VDEVICE(INTEL, 0x3b07), TCO_QM57},
262 { PCI_VDEVICE(INTEL, 0x3b08), TCO_H57},
263 { PCI_VDEVICE(INTEL, 0x3b09), TCO_HM55},
264 { PCI_VDEVICE(INTEL, 0x3b0a), TCO_Q57},
265 { PCI_VDEVICE(INTEL, 0x3b0b), TCO_HM57},
266 { PCI_VDEVICE(INTEL, 0x3b0d), TCO_PCHMSFF},
267 { PCI_VDEVICE(INTEL, 0x3b0f), TCO_QS57},
268 { PCI_VDEVICE(INTEL, 0x3b12), TCO_3400},
269 { PCI_VDEVICE(INTEL, 0x3b14), TCO_3420},
270 { PCI_VDEVICE(INTEL, 0x3b16), TCO_3450},
271 { PCI_VDEVICE(INTEL, 0x5031), TCO_EP80579},
272 { PCI_VDEVICE(INTEL, 0x1c41), TCO_CPT},
273 { PCI_VDEVICE(INTEL, 0x1c42), TCO_CPTD},
274 { PCI_VDEVICE(INTEL, 0x1c43), TCO_CPTM},
275 { PCI_VDEVICE(INTEL, 0x1c44), TCO_CPT},
276 { PCI_VDEVICE(INTEL, 0x1c45), TCO_CPT},
277 { PCI_VDEVICE(INTEL, 0x1c46), TCO_CPT},
278 { PCI_VDEVICE(INTEL, 0x1c47), TCO_CPT},
279 { PCI_VDEVICE(INTEL, 0x1c48), TCO_CPT},
280 { PCI_VDEVICE(INTEL, 0x1c49), TCO_CPT},
281 { PCI_VDEVICE(INTEL, 0x1c4a), TCO_CPT},
282 { PCI_VDEVICE(INTEL, 0x1c4b), TCO_CPT},
283 { PCI_VDEVICE(INTEL, 0x1c4c), TCO_CPT},
284 { PCI_VDEVICE(INTEL, 0x1c4d), TCO_CPT},
285 { PCI_VDEVICE(INTEL, 0x1c4e), TCO_CPT},
286 { PCI_VDEVICE(INTEL, 0x1c4f), TCO_CPT},
287 { PCI_VDEVICE(INTEL, 0x1c50), TCO_CPT},
288 { PCI_VDEVICE(INTEL, 0x1c51), TCO_CPT},
289 { PCI_VDEVICE(INTEL, 0x1c52), TCO_CPT},
290 { PCI_VDEVICE(INTEL, 0x1c53), TCO_CPT},
291 { PCI_VDEVICE(INTEL, 0x1c54), TCO_CPT},
292 { PCI_VDEVICE(INTEL, 0x1c55), TCO_CPT},
293 { PCI_VDEVICE(INTEL, 0x1c56), TCO_CPT},
294 { PCI_VDEVICE(INTEL, 0x1c57), TCO_CPT},
295 { PCI_VDEVICE(INTEL, 0x1c58), TCO_CPT},
296 { PCI_VDEVICE(INTEL, 0x1c59), TCO_CPT},
297 { PCI_VDEVICE(INTEL, 0x1c5a), TCO_CPT},
298 { PCI_VDEVICE(INTEL, 0x1c5b), TCO_CPT},
299 { PCI_VDEVICE(INTEL, 0x1c5c), TCO_CPT},
300 { PCI_VDEVICE(INTEL, 0x1c5d), TCO_CPT},
301 { PCI_VDEVICE(INTEL, 0x1c5e), TCO_CPT},
302 { PCI_VDEVICE(INTEL, 0x1c5f), TCO_CPT},
303 { PCI_VDEVICE(INTEL, 0x1d40), TCO_PBG},
304 { PCI_VDEVICE(INTEL, 0x1d41), TCO_PBG},
305 { PCI_VDEVICE(INTEL, 0x2310), TCO_DH89XXCC},
306 { PCI_VDEVICE(INTEL, 0x1e40), TCO_PPT},
307 { PCI_VDEVICE(INTEL, 0x1e41), TCO_PPT},
308 { PCI_VDEVICE(INTEL, 0x1e42), TCO_PPT},
309 { PCI_VDEVICE(INTEL, 0x1e43), TCO_PPT},
310 { PCI_VDEVICE(INTEL, 0x1e44), TCO_PPT},
311 { PCI_VDEVICE(INTEL, 0x1e45), TCO_PPT},
312 { PCI_VDEVICE(INTEL, 0x1e46), TCO_PPT},
313 { PCI_VDEVICE(INTEL, 0x1e47), TCO_PPT},
314 { PCI_VDEVICE(INTEL, 0x1e48), TCO_PPT},
315 { PCI_VDEVICE(INTEL, 0x1e49), TCO_PPT},
316 { PCI_VDEVICE(INTEL, 0x1e4a), TCO_PPT},
317 { PCI_VDEVICE(INTEL, 0x1e4b), TCO_PPT},
318 { PCI_VDEVICE(INTEL, 0x1e4c), TCO_PPT},
319 { PCI_VDEVICE(INTEL, 0x1e4d), TCO_PPT},
320 { PCI_VDEVICE(INTEL, 0x1e4e), TCO_PPT},
321 { PCI_VDEVICE(INTEL, 0x1e4f), TCO_PPT},
322 { PCI_VDEVICE(INTEL, 0x1e50), TCO_PPT},
323 { PCI_VDEVICE(INTEL, 0x1e51), TCO_PPT},
324 { PCI_VDEVICE(INTEL, 0x1e52), TCO_PPT},
325 { PCI_VDEVICE(INTEL, 0x1e53), TCO_PPT},
326 { PCI_VDEVICE(INTEL, 0x1e54), TCO_PPT},
327 { PCI_VDEVICE(INTEL, 0x1e55), TCO_PPT},
328 { PCI_VDEVICE(INTEL, 0x1e56), TCO_PPT},
329 { PCI_VDEVICE(INTEL, 0x1e57), TCO_PPT},
330 { PCI_VDEVICE(INTEL, 0x1e58), TCO_PPT},
331 { PCI_VDEVICE(INTEL, 0x1e59), TCO_PPT},
332 { PCI_VDEVICE(INTEL, 0x1e5a), TCO_PPT},
333 { PCI_VDEVICE(INTEL, 0x1e5b), TCO_PPT},
334 { PCI_VDEVICE(INTEL, 0x1e5c), TCO_PPT},
335 { PCI_VDEVICE(INTEL, 0x1e5d), TCO_PPT},
336 { PCI_VDEVICE(INTEL, 0x1e5e), TCO_PPT},
337 { PCI_VDEVICE(INTEL, 0x1e5f), TCO_PPT},
338 { PCI_VDEVICE(INTEL, 0x8c40), TCO_LPT},
339 { PCI_VDEVICE(INTEL, 0x8c41), TCO_LPT},
340 { PCI_VDEVICE(INTEL, 0x8c42), TCO_LPT},
341 { PCI_VDEVICE(INTEL, 0x8c43), TCO_LPT},
342 { PCI_VDEVICE(INTEL, 0x8c44), TCO_LPT},
343 { PCI_VDEVICE(INTEL, 0x8c45), TCO_LPT},
344 { PCI_VDEVICE(INTEL, 0x8c46), TCO_LPT},
345 { PCI_VDEVICE(INTEL, 0x8c47), TCO_LPT},
346 { PCI_VDEVICE(INTEL, 0x8c48), TCO_LPT},
347 { PCI_VDEVICE(INTEL, 0x8c49), TCO_LPT},
348 { PCI_VDEVICE(INTEL, 0x8c4a), TCO_LPT},
349 { PCI_VDEVICE(INTEL, 0x8c4b), TCO_LPT},
350 { PCI_VDEVICE(INTEL, 0x8c4c), TCO_LPT},
351 { PCI_VDEVICE(INTEL, 0x8c4d), TCO_LPT},
352 { PCI_VDEVICE(INTEL, 0x8c4e), TCO_LPT},
353 { PCI_VDEVICE(INTEL, 0x8c4f), TCO_LPT},
354 { PCI_VDEVICE(INTEL, 0x8c50), TCO_LPT},
355 { PCI_VDEVICE(INTEL, 0x8c51), TCO_LPT},
356 { PCI_VDEVICE(INTEL, 0x8c52), TCO_LPT},
357 { PCI_VDEVICE(INTEL, 0x8c53), TCO_LPT},
358 { PCI_VDEVICE(INTEL, 0x8c54), TCO_LPT},
359 { PCI_VDEVICE(INTEL, 0x8c55), TCO_LPT},
360 { PCI_VDEVICE(INTEL, 0x8c56), TCO_LPT},
361 { PCI_VDEVICE(INTEL, 0x8c57), TCO_LPT},
362 { PCI_VDEVICE(INTEL, 0x8c58), TCO_LPT},
363 { PCI_VDEVICE(INTEL, 0x8c59), TCO_LPT},
364 { PCI_VDEVICE(INTEL, 0x8c5a), TCO_LPT},
365 { PCI_VDEVICE(INTEL, 0x8c5b), TCO_LPT},
366 { PCI_VDEVICE(INTEL, 0x8c5c), TCO_LPT},
367 { PCI_VDEVICE(INTEL, 0x8c5d), TCO_LPT},
368 { PCI_VDEVICE(INTEL, 0x8c5e), TCO_LPT},
369 { PCI_VDEVICE(INTEL, 0x8c5f), TCO_LPT},
370 { 0, }, /* End of list */
371 };
372 MODULE_DEVICE_TABLE(pci, iTCO_wdt_pci_tbl);
373
374 /* Address definitions for the TCO */
375 /* TCO base address */
376 #define TCOBASE (iTCO_wdt_private.ACPIBASE + 0x60)
377 /* SMI Control and Enable Register */
378 #define SMI_EN (iTCO_wdt_private.ACPIBASE + 0x30)
379
380 #define TCO_RLD (TCOBASE + 0x00) /* TCO Timer Reload and Curr. Value */
381 #define TCOv1_TMR (TCOBASE + 0x01) /* TCOv1 Timer Initial Value */
382 #define TCO_DAT_IN (TCOBASE + 0x02) /* TCO Data In Register */
383 #define TCO_DAT_OUT (TCOBASE + 0x03) /* TCO Data Out Register */
384 #define TCO1_STS (TCOBASE + 0x04) /* TCO1 Status Register */
385 #define TCO2_STS (TCOBASE + 0x06) /* TCO2 Status Register */
386 #define TCO1_CNT (TCOBASE + 0x08) /* TCO1 Control Register */
387 #define TCO2_CNT (TCOBASE + 0x0a) /* TCO2 Control Register */
388 #define TCOv2_TMR (TCOBASE + 0x12) /* TCOv2 Timer Initial Value */
389
390 /* internal variables */
391 static unsigned long is_active;
392 static char expect_release;
393 static struct { /* this is private data for the iTCO_wdt device */
394 /* TCO version/generation */
395 unsigned int iTCO_version;
396 /* The device's ACPIBASE address (TCOBASE = ACPIBASE+0x60) */
397 unsigned long ACPIBASE;
398 /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2)*/
399 unsigned long __iomem *gcs;
400 /* the lock for io operations */
401 spinlock_t io_lock;
402 /* the PCI-device */
403 struct pci_dev *pdev;
404 } iTCO_wdt_private;
405
406 /* the watchdog platform device */
407 static struct platform_device *iTCO_wdt_platform_device;
408
409 /* module parameters */
410 #define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */
411 static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
412 module_param(heartbeat, int, 0);
413 MODULE_PARM_DESC(heartbeat, "Watchdog timeout in seconds. "
414 "5..76 (TCO v1) or 3..614 (TCO v2), default="
415 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
416
417 static bool nowayout = WATCHDOG_NOWAYOUT;
418 module_param(nowayout, bool, 0);
419 MODULE_PARM_DESC(nowayout,
420 "Watchdog cannot be stopped once started (default="
421 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
422
423 static int turn_SMI_watchdog_clear_off = 1;
424 module_param(turn_SMI_watchdog_clear_off, int, 0);
425 MODULE_PARM_DESC(turn_SMI_watchdog_clear_off,
426 "Turn off SMI clearing watchdog (depends on TCO-version)(default=1)");
427
428 /*
429 * Some TCO specific functions
430 */
431
seconds_to_ticks(int seconds)432 static inline unsigned int seconds_to_ticks(int seconds)
433 {
434 /* the internal timer is stored as ticks which decrement
435 * every 0.6 seconds */
436 return (seconds * 10) / 6;
437 }
438
iTCO_wdt_set_NO_REBOOT_bit(void)439 static void iTCO_wdt_set_NO_REBOOT_bit(void)
440 {
441 u32 val32;
442
443 /* Set the NO_REBOOT bit: this disables reboots */
444 if (iTCO_wdt_private.iTCO_version == 2) {
445 val32 = readl(iTCO_wdt_private.gcs);
446 val32 |= 0x00000020;
447 writel(val32, iTCO_wdt_private.gcs);
448 } else if (iTCO_wdt_private.iTCO_version == 1) {
449 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
450 val32 |= 0x00000002;
451 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
452 }
453 }
454
iTCO_wdt_unset_NO_REBOOT_bit(void)455 static int iTCO_wdt_unset_NO_REBOOT_bit(void)
456 {
457 int ret = 0;
458 u32 val32;
459
460 /* Unset the NO_REBOOT bit: this enables reboots */
461 if (iTCO_wdt_private.iTCO_version == 2) {
462 val32 = readl(iTCO_wdt_private.gcs);
463 val32 &= 0xffffffdf;
464 writel(val32, iTCO_wdt_private.gcs);
465
466 val32 = readl(iTCO_wdt_private.gcs);
467 if (val32 & 0x00000020)
468 ret = -EIO;
469 } else if (iTCO_wdt_private.iTCO_version == 1) {
470 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
471 val32 &= 0xfffffffd;
472 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
473
474 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
475 if (val32 & 0x00000002)
476 ret = -EIO;
477 }
478
479 return ret; /* returns: 0 = OK, -EIO = Error */
480 }
481
iTCO_wdt_start(void)482 static int iTCO_wdt_start(void)
483 {
484 unsigned int val;
485
486 spin_lock(&iTCO_wdt_private.io_lock);
487
488 iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat);
489
490 /* disable chipset's NO_REBOOT bit */
491 if (iTCO_wdt_unset_NO_REBOOT_bit()) {
492 spin_unlock(&iTCO_wdt_private.io_lock);
493 pr_err("failed to reset NO_REBOOT flag, reboot disabled by hardware/BIOS\n");
494 return -EIO;
495 }
496
497 /* Force the timer to its reload value by writing to the TCO_RLD
498 register */
499 if (iTCO_wdt_private.iTCO_version == 2)
500 outw(0x01, TCO_RLD);
501 else if (iTCO_wdt_private.iTCO_version == 1)
502 outb(0x01, TCO_RLD);
503
504 /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
505 val = inw(TCO1_CNT);
506 val &= 0xf7ff;
507 outw(val, TCO1_CNT);
508 val = inw(TCO1_CNT);
509 spin_unlock(&iTCO_wdt_private.io_lock);
510
511 if (val & 0x0800)
512 return -1;
513 return 0;
514 }
515
iTCO_wdt_stop(void)516 static int iTCO_wdt_stop(void)
517 {
518 unsigned int val;
519
520 spin_lock(&iTCO_wdt_private.io_lock);
521
522 iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE);
523
524 /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
525 val = inw(TCO1_CNT);
526 val |= 0x0800;
527 outw(val, TCO1_CNT);
528 val = inw(TCO1_CNT);
529
530 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
531 iTCO_wdt_set_NO_REBOOT_bit();
532
533 spin_unlock(&iTCO_wdt_private.io_lock);
534
535 if ((val & 0x0800) == 0)
536 return -1;
537 return 0;
538 }
539
iTCO_wdt_keepalive(void)540 static int iTCO_wdt_keepalive(void)
541 {
542 spin_lock(&iTCO_wdt_private.io_lock);
543
544 iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat);
545
546 /* Reload the timer by writing to the TCO Timer Counter register */
547 if (iTCO_wdt_private.iTCO_version == 2)
548 outw(0x01, TCO_RLD);
549 else if (iTCO_wdt_private.iTCO_version == 1) {
550 /* Reset the timeout status bit so that the timer
551 * needs to count down twice again before rebooting */
552 outw(0x0008, TCO1_STS); /* write 1 to clear bit */
553
554 outb(0x01, TCO_RLD);
555 }
556
557 spin_unlock(&iTCO_wdt_private.io_lock);
558 return 0;
559 }
560
iTCO_wdt_set_heartbeat(int t)561 static int iTCO_wdt_set_heartbeat(int t)
562 {
563 unsigned int val16;
564 unsigned char val8;
565 unsigned int tmrval;
566
567 tmrval = seconds_to_ticks(t);
568
569 /* For TCO v1 the timer counts down twice before rebooting */
570 if (iTCO_wdt_private.iTCO_version == 1)
571 tmrval /= 2;
572
573 /* from the specs: */
574 /* "Values of 0h-3h are ignored and should not be attempted" */
575 if (tmrval < 0x04)
576 return -EINVAL;
577 if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) ||
578 ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
579 return -EINVAL;
580
581 iTCO_vendor_pre_set_heartbeat(tmrval);
582
583 /* Write new heartbeat to watchdog */
584 if (iTCO_wdt_private.iTCO_version == 2) {
585 spin_lock(&iTCO_wdt_private.io_lock);
586 val16 = inw(TCOv2_TMR);
587 val16 &= 0xfc00;
588 val16 |= tmrval;
589 outw(val16, TCOv2_TMR);
590 val16 = inw(TCOv2_TMR);
591 spin_unlock(&iTCO_wdt_private.io_lock);
592
593 if ((val16 & 0x3ff) != tmrval)
594 return -EINVAL;
595 } else if (iTCO_wdt_private.iTCO_version == 1) {
596 spin_lock(&iTCO_wdt_private.io_lock);
597 val8 = inb(TCOv1_TMR);
598 val8 &= 0xc0;
599 val8 |= (tmrval & 0xff);
600 outb(val8, TCOv1_TMR);
601 val8 = inb(TCOv1_TMR);
602 spin_unlock(&iTCO_wdt_private.io_lock);
603
604 if ((val8 & 0x3f) != tmrval)
605 return -EINVAL;
606 }
607
608 heartbeat = t;
609 return 0;
610 }
611
iTCO_wdt_get_timeleft(int * time_left)612 static int iTCO_wdt_get_timeleft(int *time_left)
613 {
614 unsigned int val16;
615 unsigned char val8;
616
617 /* read the TCO Timer */
618 if (iTCO_wdt_private.iTCO_version == 2) {
619 spin_lock(&iTCO_wdt_private.io_lock);
620 val16 = inw(TCO_RLD);
621 val16 &= 0x3ff;
622 spin_unlock(&iTCO_wdt_private.io_lock);
623
624 *time_left = (val16 * 6) / 10;
625 } else if (iTCO_wdt_private.iTCO_version == 1) {
626 spin_lock(&iTCO_wdt_private.io_lock);
627 val8 = inb(TCO_RLD);
628 val8 &= 0x3f;
629 if (!(inw(TCO1_STS) & 0x0008))
630 val8 += (inb(TCOv1_TMR) & 0x3f);
631 spin_unlock(&iTCO_wdt_private.io_lock);
632
633 *time_left = (val8 * 6) / 10;
634 } else
635 return -EINVAL;
636 return 0;
637 }
638
639 /*
640 * /dev/watchdog handling
641 */
642
iTCO_wdt_open(struct inode * inode,struct file * file)643 static int iTCO_wdt_open(struct inode *inode, struct file *file)
644 {
645 /* /dev/watchdog can only be opened once */
646 if (test_and_set_bit(0, &is_active))
647 return -EBUSY;
648
649 /*
650 * Reload and activate timer
651 */
652 iTCO_wdt_start();
653 return nonseekable_open(inode, file);
654 }
655
iTCO_wdt_release(struct inode * inode,struct file * file)656 static int iTCO_wdt_release(struct inode *inode, struct file *file)
657 {
658 /*
659 * Shut off the timer.
660 */
661 if (expect_release == 42) {
662 iTCO_wdt_stop();
663 } else {
664 pr_crit("Unexpected close, not stopping watchdog!\n");
665 iTCO_wdt_keepalive();
666 }
667 clear_bit(0, &is_active);
668 expect_release = 0;
669 return 0;
670 }
671
iTCO_wdt_write(struct file * file,const char __user * data,size_t len,loff_t * ppos)672 static ssize_t iTCO_wdt_write(struct file *file, const char __user *data,
673 size_t len, loff_t *ppos)
674 {
675 /* See if we got the magic character 'V' and reload the timer */
676 if (len) {
677 if (!nowayout) {
678 size_t i;
679
680 /* note: just in case someone wrote the magic
681 character five months ago... */
682 expect_release = 0;
683
684 /* scan to see whether or not we got the
685 magic character */
686 for (i = 0; i != len; i++) {
687 char c;
688 if (get_user(c, data + i))
689 return -EFAULT;
690 if (c == 'V')
691 expect_release = 42;
692 }
693 }
694
695 /* someone wrote to us, we should reload the timer */
696 iTCO_wdt_keepalive();
697 }
698 return len;
699 }
700
iTCO_wdt_ioctl(struct file * file,unsigned int cmd,unsigned long arg)701 static long iTCO_wdt_ioctl(struct file *file, unsigned int cmd,
702 unsigned long arg)
703 {
704 int new_options, retval = -EINVAL;
705 int new_heartbeat;
706 void __user *argp = (void __user *)arg;
707 int __user *p = argp;
708 static const struct watchdog_info ident = {
709 .options = WDIOF_SETTIMEOUT |
710 WDIOF_KEEPALIVEPING |
711 WDIOF_MAGICCLOSE,
712 .firmware_version = 0,
713 .identity = DRV_NAME,
714 };
715
716 switch (cmd) {
717 case WDIOC_GETSUPPORT:
718 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
719 case WDIOC_GETSTATUS:
720 case WDIOC_GETBOOTSTATUS:
721 return put_user(0, p);
722
723 case WDIOC_SETOPTIONS:
724 {
725 if (get_user(new_options, p))
726 return -EFAULT;
727
728 if (new_options & WDIOS_DISABLECARD) {
729 iTCO_wdt_stop();
730 retval = 0;
731 }
732 if (new_options & WDIOS_ENABLECARD) {
733 iTCO_wdt_keepalive();
734 iTCO_wdt_start();
735 retval = 0;
736 }
737 return retval;
738 }
739 case WDIOC_KEEPALIVE:
740 iTCO_wdt_keepalive();
741 return 0;
742
743 case WDIOC_SETTIMEOUT:
744 {
745 if (get_user(new_heartbeat, p))
746 return -EFAULT;
747 if (iTCO_wdt_set_heartbeat(new_heartbeat))
748 return -EINVAL;
749 iTCO_wdt_keepalive();
750 /* Fall */
751 }
752 case WDIOC_GETTIMEOUT:
753 return put_user(heartbeat, p);
754 case WDIOC_GETTIMELEFT:
755 {
756 int time_left;
757 if (iTCO_wdt_get_timeleft(&time_left))
758 return -EINVAL;
759 return put_user(time_left, p);
760 }
761 default:
762 return -ENOTTY;
763 }
764 }
765
766 /*
767 * Kernel Interfaces
768 */
769
770 static const struct file_operations iTCO_wdt_fops = {
771 .owner = THIS_MODULE,
772 .llseek = no_llseek,
773 .write = iTCO_wdt_write,
774 .unlocked_ioctl = iTCO_wdt_ioctl,
775 .open = iTCO_wdt_open,
776 .release = iTCO_wdt_release,
777 };
778
779 static struct miscdevice iTCO_wdt_miscdev = {
780 .minor = WATCHDOG_MINOR,
781 .name = "watchdog",
782 .fops = &iTCO_wdt_fops,
783 };
784
785 /*
786 * Init & exit routines
787 */
788
iTCO_wdt_init(struct pci_dev * pdev,const struct pci_device_id * ent,struct platform_device * dev)789 static int __devinit iTCO_wdt_init(struct pci_dev *pdev,
790 const struct pci_device_id *ent, struct platform_device *dev)
791 {
792 int ret;
793 u32 base_address;
794 unsigned long RCBA;
795 unsigned long val32;
796
797 /*
798 * Find the ACPI/PM base I/O address which is the base
799 * for the TCO registers (TCOBASE=ACPIBASE + 0x60)
800 * ACPIBASE is bits [15:7] from 0x40-0x43
801 */
802 pci_read_config_dword(pdev, 0x40, &base_address);
803 base_address &= 0x0000ff80;
804 if (base_address == 0x00000000) {
805 /* Something's wrong here, ACPIBASE has to be set */
806 pr_err("failed to get TCOBASE address, device disabled by hardware/BIOS\n");
807 return -ENODEV;
808 }
809 iTCO_wdt_private.iTCO_version =
810 iTCO_chipset_info[ent->driver_data].iTCO_version;
811 iTCO_wdt_private.ACPIBASE = base_address;
812 iTCO_wdt_private.pdev = pdev;
813
814 /* Get the Memory-Mapped GCS register, we need it for the
815 NO_REBOOT flag (TCO v2). To get access to it you have to
816 read RCBA from PCI Config space 0xf0 and use it as base.
817 GCS = RCBA + ICH6_GCS(0x3410). */
818 if (iTCO_wdt_private.iTCO_version == 2) {
819 pci_read_config_dword(pdev, 0xf0, &base_address);
820 if ((base_address & 1) == 0) {
821 pr_err("RCBA is disabled by hardware/BIOS, device disabled\n");
822 ret = -ENODEV;
823 goto out;
824 }
825 RCBA = base_address & 0xffffc000;
826 iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410), 4);
827 }
828
829 /* Check chipset's NO_REBOOT bit */
830 if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
831 pr_info("unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n");
832 ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
833 goto out_unmap;
834 }
835
836 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
837 iTCO_wdt_set_NO_REBOOT_bit();
838
839 /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
840 if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
841 pr_err("I/O address 0x%04lx already in use, device disabled\n",
842 SMI_EN);
843 ret = -EIO;
844 goto out_unmap;
845 }
846 if (turn_SMI_watchdog_clear_off >= iTCO_wdt_private.iTCO_version) {
847 /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
848 val32 = inl(SMI_EN);
849 val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
850 outl(val32, SMI_EN);
851 }
852
853 /* The TCO I/O registers reside in a 32-byte range pointed to
854 by the TCOBASE value */
855 if (!request_region(TCOBASE, 0x20, "iTCO_wdt")) {
856 pr_err("I/O address 0x%04lx already in use, device disabled\n",
857 TCOBASE);
858 ret = -EIO;
859 goto unreg_smi_en;
860 }
861
862 pr_info("Found a %s TCO device (Version=%d, TCOBASE=0x%04lx)\n",
863 iTCO_chipset_info[ent->driver_data].name,
864 iTCO_chipset_info[ent->driver_data].iTCO_version,
865 TCOBASE);
866
867 /* Clear out the (probably old) status */
868 outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */
869 outw(0x0002, TCO2_STS); /* Clear SECOND_TO_STS bit */
870 outw(0x0004, TCO2_STS); /* Clear BOOT_STS bit */
871
872 /* Make sure the watchdog is not running */
873 iTCO_wdt_stop();
874
875 /* Check that the heartbeat value is within it's range;
876 if not reset to the default */
877 if (iTCO_wdt_set_heartbeat(heartbeat)) {
878 iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
879 pr_info("timeout value out of range, using %d\n", heartbeat);
880 }
881
882 ret = misc_register(&iTCO_wdt_miscdev);
883 if (ret != 0) {
884 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
885 WATCHDOG_MINOR, ret);
886 goto unreg_region;
887 }
888
889 pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
890 heartbeat, nowayout);
891
892 return 0;
893
894 unreg_region:
895 release_region(TCOBASE, 0x20);
896 unreg_smi_en:
897 release_region(SMI_EN, 4);
898 out_unmap:
899 if (iTCO_wdt_private.iTCO_version == 2)
900 iounmap(iTCO_wdt_private.gcs);
901 out:
902 iTCO_wdt_private.ACPIBASE = 0;
903 return ret;
904 }
905
iTCO_wdt_cleanup(void)906 static void __devexit iTCO_wdt_cleanup(void)
907 {
908 /* Stop the timer before we leave */
909 if (!nowayout)
910 iTCO_wdt_stop();
911
912 /* Deregister */
913 misc_deregister(&iTCO_wdt_miscdev);
914 release_region(TCOBASE, 0x20);
915 release_region(SMI_EN, 4);
916 if (iTCO_wdt_private.iTCO_version == 2)
917 iounmap(iTCO_wdt_private.gcs);
918 pci_dev_put(iTCO_wdt_private.pdev);
919 iTCO_wdt_private.ACPIBASE = 0;
920 }
921
iTCO_wdt_probe(struct platform_device * dev)922 static int __devinit iTCO_wdt_probe(struct platform_device *dev)
923 {
924 int ret = -ENODEV;
925 int found = 0;
926 struct pci_dev *pdev = NULL;
927 const struct pci_device_id *ent;
928
929 spin_lock_init(&iTCO_wdt_private.io_lock);
930
931 for_each_pci_dev(pdev) {
932 ent = pci_match_id(iTCO_wdt_pci_tbl, pdev);
933 if (ent) {
934 found++;
935 ret = iTCO_wdt_init(pdev, ent, dev);
936 if (!ret)
937 break;
938 }
939 }
940
941 if (!found)
942 pr_info("No device detected\n");
943
944 return ret;
945 }
946
iTCO_wdt_remove(struct platform_device * dev)947 static int __devexit iTCO_wdt_remove(struct platform_device *dev)
948 {
949 if (iTCO_wdt_private.ACPIBASE)
950 iTCO_wdt_cleanup();
951
952 return 0;
953 }
954
iTCO_wdt_shutdown(struct platform_device * dev)955 static void iTCO_wdt_shutdown(struct platform_device *dev)
956 {
957 iTCO_wdt_stop();
958 }
959
960 static struct platform_driver iTCO_wdt_driver = {
961 .probe = iTCO_wdt_probe,
962 .remove = __devexit_p(iTCO_wdt_remove),
963 .shutdown = iTCO_wdt_shutdown,
964 .driver = {
965 .owner = THIS_MODULE,
966 .name = DRV_NAME,
967 },
968 };
969
iTCO_wdt_init_module(void)970 static int __init iTCO_wdt_init_module(void)
971 {
972 int err;
973
974 pr_info("Intel TCO WatchDog Timer Driver v%s\n", DRV_VERSION);
975
976 err = platform_driver_register(&iTCO_wdt_driver);
977 if (err)
978 return err;
979
980 iTCO_wdt_platform_device = platform_device_register_simple(DRV_NAME,
981 -1, NULL, 0);
982 if (IS_ERR(iTCO_wdt_platform_device)) {
983 err = PTR_ERR(iTCO_wdt_platform_device);
984 goto unreg_platform_driver;
985 }
986
987 return 0;
988
989 unreg_platform_driver:
990 platform_driver_unregister(&iTCO_wdt_driver);
991 return err;
992 }
993
iTCO_wdt_cleanup_module(void)994 static void __exit iTCO_wdt_cleanup_module(void)
995 {
996 platform_device_unregister(iTCO_wdt_platform_device);
997 platform_driver_unregister(&iTCO_wdt_driver);
998 pr_info("Watchdog Module Unloaded\n");
999 }
1000
1001 module_init(iTCO_wdt_init_module);
1002 module_exit(iTCO_wdt_cleanup_module);
1003
1004 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
1005 MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
1006 MODULE_VERSION(DRV_VERSION);
1007 MODULE_LICENSE("GPL");
1008 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
1009