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mm-only debug patch...
[mmotm.git] / drivers / watchdog / iTCO_wdt.c
blob6a51edde6ea7ce63abfea260c92c539d73003cbf
1 /*
2 * intel TCO Watchdog Driver (Used in i82801 and i63xxESB chipsets)
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 * 82801AA (ICH) : document number 290655-003, 290677-014,
18 * 82801AB (ICHO) : document number 290655-003, 290677-014,
19 * 82801BA (ICH2) : document number 290687-002, 298242-027,
20 * 82801BAM (ICH2-M) : document number 290687-002, 298242-027,
21 * 82801CA (ICH3-S) : document number 290733-003, 290739-013,
22 * 82801CAM (ICH3-M) : document number 290716-001, 290718-007,
23 * 82801DB (ICH4) : document number 290744-001, 290745-025,
24 * 82801DBM (ICH4-M) : document number 252337-001, 252663-008,
25 * 82801E (C-ICH) : document number 273599-001, 273645-002,
26 * 82801EB (ICH5) : document number 252516-001, 252517-028,
27 * 82801ER (ICH5R) : document number 252516-001, 252517-028,
28 * 6300ESB (6300ESB) : document number 300641-004, 300884-013,
29 * 82801FB (ICH6) : document number 301473-002, 301474-026,
30 * 82801FR (ICH6R) : document number 301473-002, 301474-026,
31 * 82801FBM (ICH6-M) : document number 301473-002, 301474-026,
32 * 82801FW (ICH6W) : document number 301473-001, 301474-026,
33 * 82801FRW (ICH6RW) : document number 301473-001, 301474-026,
34 * 631xESB (631xESB) : document number 313082-001, 313075-006,
35 * 632xESB (632xESB) : document number 313082-001, 313075-006,
36 * 82801GB (ICH7) : document number 307013-003, 307014-024,
37 * 82801GR (ICH7R) : document number 307013-003, 307014-024,
38 * 82801GDH (ICH7DH) : document number 307013-003, 307014-024,
39 * 82801GBM (ICH7-M) : document number 307013-003, 307014-024,
40 * 82801GHM (ICH7-M DH) : document number 307013-003, 307014-024,
41 * 82801GU (ICH7-U) : document number 307013-003, 307014-024,
42 * 82801HB (ICH8) : document number 313056-003, 313057-017,
43 * 82801HR (ICH8R) : document number 313056-003, 313057-017,
44 * 82801HBM (ICH8M) : document number 313056-003, 313057-017,
45 * 82801HH (ICH8DH) : document number 313056-003, 313057-017,
46 * 82801HO (ICH8DO) : document number 313056-003, 313057-017,
47 * 82801HEM (ICH8M-E) : document number 313056-003, 313057-017,
48 * 82801IB (ICH9) : document number 316972-004, 316973-012,
49 * 82801IR (ICH9R) : document number 316972-004, 316973-012,
50 * 82801IH (ICH9DH) : document number 316972-004, 316973-012,
51 * 82801IO (ICH9DO) : document number 316972-004, 316973-012,
52 * 82801IBM (ICH9M) : document number 316972-004, 316973-012,
53 * 82801IEM (ICH9M-E) : document number 316972-004, 316973-012,
54 * 82801JIB (ICH10) : document number 319973-002, 319974-002,
55 * 82801JIR (ICH10R) : document number 319973-002, 319974-002,
56 * 82801JD (ICH10D) : document number 319973-002, 319974-002,
57 * 82801JDO (ICH10DO) : document number 319973-002, 319974-002
58 */
59
60 /*
61 * Includes, defines, variables, module parameters, ...
62 */
63
64 /* Module and version information */
65 #define DRV_NAME "iTCO_wdt"
66 #define DRV_VERSION "1.05"
67 #define PFX DRV_NAME ": "
68
69 /* Includes */
70 #include <linux/module.h> /* For module specific items */
71 #include <linux/moduleparam.h> /* For new moduleparam's */
72 #include <linux/types.h> /* For standard types (like size_t) */
73 #include <linux/errno.h> /* For the -ENODEV/... values */
74 #include <linux/kernel.h> /* For printk/panic/... */
75 #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
76 (WATCHDOG_MINOR) */
77 #include <linux/watchdog.h> /* For the watchdog specific items */
78 #include <linux/init.h> /* For __init/__exit/... */
79 #include <linux/fs.h> /* For file operations */
80 #include <linux/platform_device.h> /* For platform_driver framework */
81 #include <linux/pci.h> /* For pci functions */
82 #include <linux/ioport.h> /* For io-port access */
83 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
84 #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
85 #include <linux/io.h> /* For inb/outb/... */
86
87 #include "iTCO_vendor.h"
88
89 /* TCO related info */
90 enum iTCO_chipsets {
91 TCO_ICH = 0, /* ICH */
92 TCO_ICH0, /* ICH0 */
93 TCO_ICH2, /* ICH2 */
94 TCO_ICH2M, /* ICH2-M */
95 TCO_ICH3, /* ICH3-S */
96 TCO_ICH3M, /* ICH3-M */
97 TCO_ICH4, /* ICH4 */
98 TCO_ICH4M, /* ICH4-M */
99 TCO_CICH, /* C-ICH */
100 TCO_ICH5, /* ICH5 & ICH5R */
101 TCO_6300ESB, /* 6300ESB */
102 TCO_ICH6, /* ICH6 & ICH6R */
103 TCO_ICH6M, /* ICH6-M */
104 TCO_ICH6W, /* ICH6W & ICH6RW */
105 TCO_631XESB, /* 631xESB/632xESB */
106 TCO_ICH7, /* ICH7 & ICH7R */
107 TCO_ICH7DH, /* ICH7DH */
108 TCO_ICH7M, /* ICH7-M & ICH7-U */
109 TCO_ICH7MDH, /* ICH7-M DH */
110 TCO_ICH8, /* ICH8 & ICH8R */
111 TCO_ICH8DH, /* ICH8DH */
112 TCO_ICH8DO, /* ICH8DO */
113 TCO_ICH8M, /* ICH8M */
114 TCO_ICH8ME, /* ICH8M-E */
115 TCO_ICH9, /* ICH9 */
116 TCO_ICH9R, /* ICH9R */
117 TCO_ICH9DH, /* ICH9DH */
118 TCO_ICH9DO, /* ICH9DO */
119 TCO_ICH9M, /* ICH9M */
120 TCO_ICH9ME, /* ICH9M-E */
121 TCO_ICH10, /* ICH10 */
122 TCO_ICH10R, /* ICH10R */
123 TCO_ICH10D, /* ICH10D */
124 TCO_ICH10DO, /* ICH10DO */
125 };
126
127 static struct {
128 char *name;
129 unsigned int iTCO_version;
130 } iTCO_chipset_info[] __devinitdata = {
131 {"ICH", 1},
132 {"ICH0", 1},
133 {"ICH2", 1},
134 {"ICH2-M", 1},
135 {"ICH3-S", 1},
136 {"ICH3-M", 1},
137 {"ICH4", 1},
138 {"ICH4-M", 1},
139 {"C-ICH", 1},
140 {"ICH5 or ICH5R", 1},
141 {"6300ESB", 1},
142 {"ICH6 or ICH6R", 2},
143 {"ICH6-M", 2},
144 {"ICH6W or ICH6RW", 2},
145 {"631xESB/632xESB", 2},
146 {"ICH7 or ICH7R", 2},
147 {"ICH7DH", 2},
148 {"ICH7-M or ICH7-U", 2},
149 {"ICH7-M DH", 2},
150 {"ICH8 or ICH8R", 2},
151 {"ICH8DH", 2},
152 {"ICH8DO", 2},
153 {"ICH8M", 2},
154 {"ICH8M-E", 2},
155 {"ICH9", 2},
156 {"ICH9R", 2},
157 {"ICH9DH", 2},
158 {"ICH9DO", 2},
159 {"ICH9M", 2},
160 {"ICH9M-E", 2},
161 {"ICH10", 2},
162 {"ICH10R", 2},
163 {"ICH10D", 2},
164 {"ICH10DO", 2},
165 {NULL, 0}
166 };
167
168 #define ITCO_PCI_DEVICE(dev, data) \
169 .vendor = PCI_VENDOR_ID_INTEL, \
170 .device = dev, \
171 .subvendor = PCI_ANY_ID, \
172 .subdevice = PCI_ANY_ID, \
173 .class = 0, \
174 .class_mask = 0, \
175 .driver_data = data
176
177 /*
178 * This data only exists for exporting the supported PCI ids
179 * via MODULE_DEVICE_TABLE. We do not actually register a
180 * pci_driver, because the I/O Controller Hub has also other
181 * functions that probably will be registered by other drivers.
182 */
183 static struct pci_device_id iTCO_wdt_pci_tbl[] = {
184 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AA_0, TCO_ICH)},
185 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AB_0, TCO_ICH0)},
186 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_0, TCO_ICH2)},
187 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_10, TCO_ICH2M)},
188 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_0, TCO_ICH3)},
189 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_12, TCO_ICH3M)},
190 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_0, TCO_ICH4)},
191 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_12, TCO_ICH4M)},
192 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801E_0, TCO_CICH)},
193 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801EB_0, TCO_ICH5)},
194 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB_1, TCO_6300ESB)},
195 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_0, TCO_ICH6)},
196 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_1, TCO_ICH6M)},
197 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_2, TCO_ICH6W)},
198 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB2_0, TCO_631XESB)},
199 { ITCO_PCI_DEVICE(0x2671, TCO_631XESB)},
200 { ITCO_PCI_DEVICE(0x2672, TCO_631XESB)},
201 { ITCO_PCI_DEVICE(0x2673, TCO_631XESB)},
202 { ITCO_PCI_DEVICE(0x2674, TCO_631XESB)},
203 { ITCO_PCI_DEVICE(0x2675, TCO_631XESB)},
204 { ITCO_PCI_DEVICE(0x2676, TCO_631XESB)},
205 { ITCO_PCI_DEVICE(0x2677, TCO_631XESB)},
206 { ITCO_PCI_DEVICE(0x2678, TCO_631XESB)},
207 { ITCO_PCI_DEVICE(0x2679, TCO_631XESB)},
208 { ITCO_PCI_DEVICE(0x267a, TCO_631XESB)},
209 { ITCO_PCI_DEVICE(0x267b, TCO_631XESB)},
210 { ITCO_PCI_DEVICE(0x267c, TCO_631XESB)},
211 { ITCO_PCI_DEVICE(0x267d, TCO_631XESB)},
212 { ITCO_PCI_DEVICE(0x267e, TCO_631XESB)},
213 { ITCO_PCI_DEVICE(0x267f, TCO_631XESB)},
214 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_0, TCO_ICH7)},
215 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_30, TCO_ICH7DH)},
216 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_1, TCO_ICH7M)},
217 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_31, TCO_ICH7MDH)},
218 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_0, TCO_ICH8)},
219 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_2, TCO_ICH8DH)},
220 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_3, TCO_ICH8DO)},
221 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_4, TCO_ICH8M)},
222 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_1, TCO_ICH8ME)},
223 { ITCO_PCI_DEVICE(0x2918, TCO_ICH9)},
224 { ITCO_PCI_DEVICE(0x2916, TCO_ICH9R)},
225 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_2, TCO_ICH9DH)},
226 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_4, TCO_ICH9DO)},
227 { ITCO_PCI_DEVICE(0x2919, TCO_ICH9M)},
228 { ITCO_PCI_DEVICE(0x2917, TCO_ICH9ME)},
229 { ITCO_PCI_DEVICE(0x3a18, TCO_ICH10)},
230 { ITCO_PCI_DEVICE(0x3a16, TCO_ICH10R)},
231 { ITCO_PCI_DEVICE(0x3a1a, TCO_ICH10D)},
232 { ITCO_PCI_DEVICE(0x3a14, TCO_ICH10DO)},
233 { 0, }, /* End of list */
234 };
235 MODULE_DEVICE_TABLE(pci, iTCO_wdt_pci_tbl);
236
237 /* Address definitions for the TCO */
238 /* TCO base address */
239 #define TCOBASE (iTCO_wdt_private.ACPIBASE + 0x60)
240 /* SMI Control and Enable Register */
241 #define SMI_EN (iTCO_wdt_private.ACPIBASE + 0x30)
242
243 #define TCO_RLD (TCOBASE + 0x00) /* TCO Timer Reload and Curr. Value */
244 #define TCOv1_TMR (TCOBASE + 0x01) /* TCOv1 Timer Initial Value */
245 #define TCO_DAT_IN (TCOBASE + 0x02) /* TCO Data In Register */
246 #define TCO_DAT_OUT (TCOBASE + 0x03) /* TCO Data Out Register */
247 #define TCO1_STS (TCOBASE + 0x04) /* TCO1 Status Register */
248 #define TCO2_STS (TCOBASE + 0x06) /* TCO2 Status Register */
249 #define TCO1_CNT (TCOBASE + 0x08) /* TCO1 Control Register */
250 #define TCO2_CNT (TCOBASE + 0x0a) /* TCO2 Control Register */
251 #define TCOv2_TMR (TCOBASE + 0x12) /* TCOv2 Timer Initial Value */
252
253 /* internal variables */
254 static unsigned long is_active;
255 static char expect_release;
256 static struct { /* this is private data for the iTCO_wdt device */
257 /* TCO version/generation */
258 unsigned int iTCO_version;
259 /* The cards ACPIBASE address (TCOBASE = ACPIBASE+0x60) */
260 unsigned long ACPIBASE;
261 /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2)*/
262 unsigned long __iomem *gcs;
263 /* the lock for io operations */
264 spinlock_t io_lock;
265 /* the PCI-device */
266 struct pci_dev *pdev;
267 } iTCO_wdt_private;
268
269 /* the watchdog platform device */
270 static struct platform_device *iTCO_wdt_platform_device;
271
272 /* module parameters */
273 #define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */
274 static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
275 module_param(heartbeat, int, 0);
276 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
277 "(2<heartbeat<39 (TCO v1) or 613 (TCO v2), default="
278 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
279
280 static int nowayout = WATCHDOG_NOWAYOUT;
281 module_param(nowayout, int, 0);
282 MODULE_PARM_DESC(nowayout,
283 "Watchdog cannot be stopped once started (default="
284 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
285
286 /*
287 * Some TCO specific functions
288 */
289
290 static inline unsigned int seconds_to_ticks(int seconds)
291 {
292 /* the internal timer is stored as ticks which decrement
293 * every 0.6 seconds */
294 return (seconds * 10) / 6;
295 }
296
297 static void iTCO_wdt_set_NO_REBOOT_bit(void)
298 {
299 u32 val32;
300
301 /* Set the NO_REBOOT bit: this disables reboots */
302 if (iTCO_wdt_private.iTCO_version == 2) {
303 val32 = readl(iTCO_wdt_private.gcs);
304 val32 |= 0x00000020;
305 writel(val32, iTCO_wdt_private.gcs);
306 } else if (iTCO_wdt_private.iTCO_version == 1) {
307 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
308 val32 |= 0x00000002;
309 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
310 }
311 }
312
313 static int iTCO_wdt_unset_NO_REBOOT_bit(void)
314 {
315 int ret = 0;
316 u32 val32;
317
318 /* Unset the NO_REBOOT bit: this enables reboots */
319 if (iTCO_wdt_private.iTCO_version == 2) {
320 val32 = readl(iTCO_wdt_private.gcs);
321 val32 &= 0xffffffdf;
322 writel(val32, iTCO_wdt_private.gcs);
323
324 val32 = readl(iTCO_wdt_private.gcs);
325 if (val32 & 0x00000020)
326 ret = -EIO;
327 } else if (iTCO_wdt_private.iTCO_version == 1) {
328 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
329 val32 &= 0xfffffffd;
330 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
331
332 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
333 if (val32 & 0x00000002)
334 ret = -EIO;
335 }
336
337 return ret; /* returns: 0 = OK, -EIO = Error */
338 }
339
340 static int iTCO_wdt_start(void)
341 {
342 unsigned int val;
343
344 spin_lock(&iTCO_wdt_private.io_lock);
345
346 iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat);
347
348 /* disable chipset's NO_REBOOT bit */
349 if (iTCO_wdt_unset_NO_REBOOT_bit()) {
350 spin_unlock(&iTCO_wdt_private.io_lock);
351 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, "
352 "reboot disabled by hardware\n");
353 return -EIO;
354 }
355
356 /* Force the timer to its reload value by writing to the TCO_RLD
357 register */
358 if (iTCO_wdt_private.iTCO_version == 2)
359 outw(0x01, TCO_RLD);
360 else if (iTCO_wdt_private.iTCO_version == 1)
361 outb(0x01, TCO_RLD);
362
363 /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
364 val = inw(TCO1_CNT);
365 val &= 0xf7ff;
366 outw(val, TCO1_CNT);
367 val = inw(TCO1_CNT);
368 spin_unlock(&iTCO_wdt_private.io_lock);
369
370 if (val & 0x0800)
371 return -1;
372 return 0;
373 }
374
375 static int iTCO_wdt_stop(void)
376 {
377 unsigned int val;
378
379 spin_lock(&iTCO_wdt_private.io_lock);
380
381 iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE);
382
383 /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
384 val = inw(TCO1_CNT);
385 val |= 0x0800;
386 outw(val, TCO1_CNT);
387 val = inw(TCO1_CNT);
388
389 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
390 iTCO_wdt_set_NO_REBOOT_bit();
391
392 spin_unlock(&iTCO_wdt_private.io_lock);
393
394 if ((val & 0x0800) == 0)
395 return -1;
396 return 0;
397 }
398
399 static int iTCO_wdt_keepalive(void)
400 {
401 spin_lock(&iTCO_wdt_private.io_lock);
402
403 iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat);
404
405 /* Reload the timer by writing to the TCO Timer Counter register */
406 if (iTCO_wdt_private.iTCO_version == 2)
407 outw(0x01, TCO_RLD);
408 else if (iTCO_wdt_private.iTCO_version == 1)
409 outb(0x01, TCO_RLD);
410
411 spin_unlock(&iTCO_wdt_private.io_lock);
412 return 0;
413 }
414
415 static int iTCO_wdt_set_heartbeat(int t)
416 {
417 unsigned int val16;
418 unsigned char val8;
419 unsigned int tmrval;
420
421 tmrval = seconds_to_ticks(t);
422 /* from the specs: */
423 /* "Values of 0h-3h are ignored and should not be attempted" */
424 if (tmrval < 0x04)
425 return -EINVAL;
426 if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) ||
427 ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
428 return -EINVAL;
429
430 iTCO_vendor_pre_set_heartbeat(tmrval);
431
432 /* Write new heartbeat to watchdog */
433 if (iTCO_wdt_private.iTCO_version == 2) {
434 spin_lock(&iTCO_wdt_private.io_lock);
435 val16 = inw(TCOv2_TMR);
436 val16 &= 0xfc00;
437 val16 |= tmrval;
438 outw(val16, TCOv2_TMR);
439 val16 = inw(TCOv2_TMR);
440 spin_unlock(&iTCO_wdt_private.io_lock);
441
442 if ((val16 & 0x3ff) != tmrval)
443 return -EINVAL;
444 } else if (iTCO_wdt_private.iTCO_version == 1) {
445 spin_lock(&iTCO_wdt_private.io_lock);
446 val8 = inb(TCOv1_TMR);
447 val8 &= 0xc0;
448 val8 |= (tmrval & 0xff);
449 outb(val8, TCOv1_TMR);
450 val8 = inb(TCOv1_TMR);
451 spin_unlock(&iTCO_wdt_private.io_lock);
452
453 if ((val8 & 0x3f) != tmrval)
454 return -EINVAL;
455 }
456
457 heartbeat = t;
458 return 0;
459 }
460
461 static int iTCO_wdt_get_timeleft(int *time_left)
462 {
463 unsigned int val16;
464 unsigned char val8;
465
466 /* read the TCO Timer */
467 if (iTCO_wdt_private.iTCO_version == 2) {
468 spin_lock(&iTCO_wdt_private.io_lock);
469 val16 = inw(TCO_RLD);
470 val16 &= 0x3ff;
471 spin_unlock(&iTCO_wdt_private.io_lock);
472
473 *time_left = (val16 * 6) / 10;
474 } else if (iTCO_wdt_private.iTCO_version == 1) {
475 spin_lock(&iTCO_wdt_private.io_lock);
476 val8 = inb(TCO_RLD);
477 val8 &= 0x3f;
478 spin_unlock(&iTCO_wdt_private.io_lock);
479
480 *time_left = (val8 * 6) / 10;
481 } else
482 return -EINVAL;
483 return 0;
484 }
485
486 /*
487 * /dev/watchdog handling
488 */
489
490 static int iTCO_wdt_open(struct inode *inode, struct file *file)
491 {
492 /* /dev/watchdog can only be opened once */
493 if (test_and_set_bit(0, &is_active))
494 return -EBUSY;
495
496 /*
497 * Reload and activate timer
498 */
499 iTCO_wdt_start();
500 return nonseekable_open(inode, file);
501 }
502
503 static int iTCO_wdt_release(struct inode *inode, struct file *file)
504 {
505 /*
506 * Shut off the timer.
507 */
508 if (expect_release == 42) {
509 iTCO_wdt_stop();
510 } else {
511 printk(KERN_CRIT PFX
512 "Unexpected close, not stopping watchdog!\n");
513 iTCO_wdt_keepalive();
514 }
515 clear_bit(0, &is_active);
516 expect_release = 0;
517 return 0;
518 }
519
520 static ssize_t iTCO_wdt_write(struct file *file, const char __user *data,
521 size_t len, loff_t *ppos)
522 {
523 /* See if we got the magic character 'V' and reload the timer */
524 if (len) {
525 if (!nowayout) {
526 size_t i;
527
528 /* note: just in case someone wrote the magic
529 character five months ago... */
530 expect_release = 0;
531
532 /* scan to see whether or not we got the
533 magic character */
534 for (i = 0; i != len; i++) {
535 char c;
536 if (get_user(c, data + i))
537 return -EFAULT;
538 if (c == 'V')
539 expect_release = 42;
540 }
541 }
542
543 /* someone wrote to us, we should reload the timer */
544 iTCO_wdt_keepalive();
545 }
546 return len;
547 }
548
549 static long iTCO_wdt_ioctl(struct file *file, unsigned int cmd,
550 unsigned long arg)
551 {
552 int new_options, retval = -EINVAL;
553 int new_heartbeat;
554 void __user *argp = (void __user *)arg;
555 int __user *p = argp;
556 static struct watchdog_info ident = {
557 .options = WDIOF_SETTIMEOUT |
558 WDIOF_KEEPALIVEPING |
559 WDIOF_MAGICCLOSE,
560 .firmware_version = 0,
561 .identity = DRV_NAME,
562 };
563
564 switch (cmd) {
565 case WDIOC_GETSUPPORT:
566 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
567 case WDIOC_GETSTATUS:
568 case WDIOC_GETBOOTSTATUS:
569 return put_user(0, p);
570
571 case WDIOC_SETOPTIONS:
572 {
573 if (get_user(new_options, p))
574 return -EFAULT;
575
576 if (new_options & WDIOS_DISABLECARD) {
577 iTCO_wdt_stop();
578 retval = 0;
579 }
580 if (new_options & WDIOS_ENABLECARD) {
581 iTCO_wdt_keepalive();
582 iTCO_wdt_start();
583 retval = 0;
584 }
585 return retval;
586 }
587 case WDIOC_KEEPALIVE:
588 iTCO_wdt_keepalive();
589 return 0;
590
591 case WDIOC_SETTIMEOUT:
592 {
593 if (get_user(new_heartbeat, p))
594 return -EFAULT;
595 if (iTCO_wdt_set_heartbeat(new_heartbeat))
596 return -EINVAL;
597 iTCO_wdt_keepalive();
598 /* Fall */
599 }
600 case WDIOC_GETTIMEOUT:
601 return put_user(heartbeat, p);
602 case WDIOC_GETTIMELEFT:
603 {
604 int time_left;
605 if (iTCO_wdt_get_timeleft(&time_left))
606 return -EINVAL;
607 return put_user(time_left, p);
608 }
609 default:
610 return -ENOTTY;
611 }
612 }
613
614 /*
615 * Kernel Interfaces
616 */
617
618 static const struct file_operations iTCO_wdt_fops = {
619 .owner = THIS_MODULE,
620 .llseek = no_llseek,
621 .write = iTCO_wdt_write,
622 .unlocked_ioctl = iTCO_wdt_ioctl,
623 .open = iTCO_wdt_open,
624 .release = iTCO_wdt_release,
625 };
626
627 static struct miscdevice iTCO_wdt_miscdev = {
628 .minor = WATCHDOG_MINOR,
629 .name = "watchdog",
630 .fops = &iTCO_wdt_fops,
631 };
632
633 /*
634 * Init & exit routines
635 */
636
637 static int __devinit iTCO_wdt_init(struct pci_dev *pdev,
638 const struct pci_device_id *ent, struct platform_device *dev)
639 {
640 int ret;
641 u32 base_address;
642 unsigned long RCBA;
643 unsigned long val32;
644
645 /*
646 * Find the ACPI/PM base I/O address which is the base
647 * for the TCO registers (TCOBASE=ACPIBASE + 0x60)
648 * ACPIBASE is bits [15:7] from 0x40-0x43
649 */
650 pci_read_config_dword(pdev, 0x40, &base_address);
651 base_address &= 0x0000ff80;
652 if (base_address == 0x00000000) {
653 /* Something's wrong here, ACPIBASE has to be set */
654 printk(KERN_ERR PFX "failed to get TCOBASE address\n");
655 pci_dev_put(pdev);
656 return -ENODEV;
657 }
658 iTCO_wdt_private.iTCO_version =
659 iTCO_chipset_info[ent->driver_data].iTCO_version;
660 iTCO_wdt_private.ACPIBASE = base_address;
661 iTCO_wdt_private.pdev = pdev;
662
663 /* Get the Memory-Mapped GCS register, we need it for the
664 NO_REBOOT flag (TCO v2). To get access to it you have to
665 read RCBA from PCI Config space 0xf0 and use it as base.
666 GCS = RCBA + ICH6_GCS(0x3410). */
667 if (iTCO_wdt_private.iTCO_version == 2) {
668 pci_read_config_dword(pdev, 0xf0, &base_address);
669 if ((base_address & 1) == 0) {
670 printk(KERN_ERR PFX "RCBA is disabled by harddware\n");
671 ret = -ENODEV;
672 goto out;
673 }
674 RCBA = base_address & 0xffffc000;
675 iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410), 4);
676 }
677
678 /* Check chipset's NO_REBOOT bit */
679 if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
680 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, "
681 "reboot disabled by hardware\n");
682 ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
683 goto out_unmap;
684 }
685
686 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
687 iTCO_wdt_set_NO_REBOOT_bit();
688
689 /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
690 if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
691 printk(KERN_ERR PFX
692 "I/O address 0x%04lx already in use\n", SMI_EN);
693 ret = -EIO;
694 goto out_unmap;
695 }
696 /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
697 val32 = inl(SMI_EN);
698 val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
699 outl(val32, SMI_EN);
700
701 /* The TCO I/O registers reside in a 32-byte range pointed to
702 by the TCOBASE value */
703 if (!request_region(TCOBASE, 0x20, "iTCO_wdt")) {
704 printk(KERN_ERR PFX "I/O address 0x%04lx already in use\n",
705 TCOBASE);
706 ret = -EIO;
707 goto unreg_smi_en;
708 }
709
710 printk(KERN_INFO PFX
711 "Found a %s TCO device (Version=%d, TCOBASE=0x%04lx)\n",
712 iTCO_chipset_info[ent->driver_data].name,
713 iTCO_chipset_info[ent->driver_data].iTCO_version,
714 TCOBASE);
715
716 /* Clear out the (probably old) status */
717 outb(8, TCO1_STS); /* Clear the Time Out Status bit */
718 outb(2, TCO2_STS); /* Clear SECOND_TO_STS bit */
719 outb(4, TCO2_STS); /* Clear BOOT_STS bit */
720
721 /* Make sure the watchdog is not running */
722 iTCO_wdt_stop();
723
724 /* Check that the heartbeat value is within it's range;
725 if not reset to the default */
726 if (iTCO_wdt_set_heartbeat(heartbeat)) {
727 iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
728 printk(KERN_INFO PFX
729 "heartbeat value must be 2 < heartbeat < 39 (TCO v1) "
730 "or 613 (TCO v2), using %d\n", heartbeat);
731 }
732
733 ret = misc_register(&iTCO_wdt_miscdev);
734 if (ret != 0) {
735 printk(KERN_ERR PFX
736 "cannot register miscdev on minor=%d (err=%d)\n",
737 WATCHDOG_MINOR, ret);
738 goto unreg_region;
739 }
740
741 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
742 heartbeat, nowayout);
743
744 return 0;
745
746 unreg_region:
747 release_region(TCOBASE, 0x20);
748 unreg_smi_en:
749 release_region(SMI_EN, 4);
750 out_unmap:
751 if (iTCO_wdt_private.iTCO_version == 2)
752 iounmap(iTCO_wdt_private.gcs);
753 out:
754 pci_dev_put(iTCO_wdt_private.pdev);
755 iTCO_wdt_private.ACPIBASE = 0;
756 return ret;
757 }
758
759 static void __devexit iTCO_wdt_cleanup(void)
760 {
761 /* Stop the timer before we leave */
762 if (!nowayout)
763 iTCO_wdt_stop();
764
765 /* Deregister */
766 misc_deregister(&iTCO_wdt_miscdev);
767 release_region(TCOBASE, 0x20);
768 release_region(SMI_EN, 4);
769 if (iTCO_wdt_private.iTCO_version == 2)
770 iounmap(iTCO_wdt_private.gcs);
771 pci_dev_put(iTCO_wdt_private.pdev);
772 iTCO_wdt_private.ACPIBASE = 0;
773 }
774
775 static int __devinit iTCO_wdt_probe(struct platform_device *dev)
776 {
777 int found = 0;
778 struct pci_dev *pdev = NULL;
779 const struct pci_device_id *ent;
780
781 spin_lock_init(&iTCO_wdt_private.io_lock);
782
783 for_each_pci_dev(pdev) {
784 ent = pci_match_id(iTCO_wdt_pci_tbl, pdev);
785 if (ent) {
786 if (!(iTCO_wdt_init(pdev, ent, dev))) {
787 found++;
788 break;
789 }
790 }
791 }
792
793 if (!found) {
794 printk(KERN_INFO PFX "No card detected\n");
795 return -ENODEV;
796 }
797
798 return 0;
799 }
800
801 static int __devexit iTCO_wdt_remove(struct platform_device *dev)
802 {
803 if (iTCO_wdt_private.ACPIBASE)
804 iTCO_wdt_cleanup();
805
806 return 0;
807 }
808
809 static void iTCO_wdt_shutdown(struct platform_device *dev)
810 {
811 iTCO_wdt_stop();
812 }
813
814 #define iTCO_wdt_suspend NULL
815 #define iTCO_wdt_resume NULL
816
817 static struct platform_driver iTCO_wdt_driver = {
818 .probe = iTCO_wdt_probe,
819 .remove = __devexit_p(iTCO_wdt_remove),
820 .shutdown = iTCO_wdt_shutdown,
821 .suspend = iTCO_wdt_suspend,
822 .resume = iTCO_wdt_resume,
823 .driver = {
824 .owner = THIS_MODULE,
825 .name = DRV_NAME,
826 },
827 };
828
829 static int __init iTCO_wdt_init_module(void)
830 {
831 int err;
832
833 printk(KERN_INFO PFX "Intel TCO WatchDog Timer Driver v%s\n",
834 DRV_VERSION);
835
836 err = platform_driver_register(&iTCO_wdt_driver);
837 if (err)
838 return err;
839
840 iTCO_wdt_platform_device = platform_device_register_simple(DRV_NAME,
841 -1, NULL, 0);
842 if (IS_ERR(iTCO_wdt_platform_device)) {
843 err = PTR_ERR(iTCO_wdt_platform_device);
844 goto unreg_platform_driver;
845 }
846
847 return 0;
848
849 unreg_platform_driver:
850 platform_driver_unregister(&iTCO_wdt_driver);
851 return err;
852 }
853
854 static void __exit iTCO_wdt_cleanup_module(void)
855 {
856 platform_device_unregister(iTCO_wdt_platform_device);
857 platform_driver_unregister(&iTCO_wdt_driver);
858 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
859 }
860
861 module_init(iTCO_wdt_init_module);
862 module_exit(iTCO_wdt_cleanup_module);
863
864 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
865 MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
866 MODULE_VERSION(DRV_VERSION);
867 MODULE_LICENSE("GPL");
868 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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