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mm: fix assertion
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / watchdog / iTCO_wdt.c
blobbfb93bc2ca9f50c27278fe8d29384605f8f03e26
1 /*
2 * intel TCO Watchdog Driver (Used in i82801 and i6300ESB chipsets)
3 *
4 * (c) Copyright 2006-2007 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, 290745-020,
24 * 82801DBM (ICH4-M) : document number 252337-001, 252663-005,
25 * 82801E (C-ICH) : document number 273599-001, 273645-002,
26 * 82801EB (ICH5) : document number 252516-001, 252517-003,
27 * 82801ER (ICH5R) : document number 252516-001, 252517-003,
28 * 82801FB (ICH6) : document number 301473-002, 301474-007,
29 * 82801FR (ICH6R) : document number 301473-002, 301474-007,
30 * 82801FBM (ICH6-M) : document number 301473-002, 301474-007,
31 * 82801FW (ICH6W) : document number 301473-001, 301474-007,
32 * 82801FRW (ICH6RW) : document number 301473-001, 301474-007,
33 * 82801GB (ICH7) : document number 307013-002, 307014-009,
34 * 82801GR (ICH7R) : document number 307013-002, 307014-009,
35 * 82801GDH (ICH7DH) : document number 307013-002, 307014-009,
36 * 82801GBM (ICH7-M) : document number 307013-002, 307014-009,
37 * 82801GHM (ICH7-M DH) : document number 307013-002, 307014-009,
38 * 82801HB (ICH8) : document number 313056-003, 313057-009,
39 * 82801HR (ICH8R) : document number 313056-003, 313057-009,
40 * 82801HBM (ICH8M) : document number 313056-003, 313057-009,
41 * 82801HH (ICH8DH) : document number 313056-003, 313057-009,
42 * 82801HO (ICH8DO) : document number 313056-003, 313057-009,
43 * 82801HEM (ICH8M-E) : document number 313056-003, 313057-009,
44 * 82801IB (ICH9) : document number 316972-001, 316973-006,
45 * 82801IR (ICH9R) : document number 316972-001, 316973-006,
46 * 82801IH (ICH9DH) : document number 316972-001, 316973-006,
47 * 82801IO (ICH9DO) : document number 316972-001, 316973-006,
48 * 6300ESB (6300ESB) : document number 300641-003, 300884-010,
49 * 631xESB (631xESB) : document number 313082-001, 313075-005,
50 * 632xESB (632xESB) : document number 313082-001, 313075-005
51 */
52
53 /*
54 * Includes, defines, variables, module parameters, ...
55 */
56
57 /* Module and version information */
58 #define DRV_NAME "iTCO_wdt"
59 #define DRV_VERSION "1.03"
60 #define DRV_RELDATE "30-Apr-2008"
61 #define PFX DRV_NAME ": "
62
63 /* Includes */
64 #include <linux/module.h> /* For module specific items */
65 #include <linux/moduleparam.h> /* For new moduleparam's */
66 #include <linux/types.h> /* For standard types (like size_t) */
67 #include <linux/errno.h> /* For the -ENODEV/... values */
68 #include <linux/kernel.h> /* For printk/panic/... */
69 #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
70 (WATCHDOG_MINOR) */
71 #include <linux/watchdog.h> /* For the watchdog specific items */
72 #include <linux/init.h> /* For __init/__exit/... */
73 #include <linux/fs.h> /* For file operations */
74 #include <linux/platform_device.h> /* For platform_driver framework */
75 #include <linux/pci.h> /* For pci functions */
76 #include <linux/ioport.h> /* For io-port access */
77 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
78 #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
79 #include <linux/io.h> /* For inb/outb/... */
80
81 #include "iTCO_vendor.h"
82
83 /* TCO related info */
84 enum iTCO_chipsets {
85 TCO_ICH = 0, /* ICH */
86 TCO_ICH0, /* ICH0 */
87 TCO_ICH2, /* ICH2 */
88 TCO_ICH2M, /* ICH2-M */
89 TCO_ICH3, /* ICH3-S */
90 TCO_ICH3M, /* ICH3-M */
91 TCO_ICH4, /* ICH4 */
92 TCO_ICH4M, /* ICH4-M */
93 TCO_CICH, /* C-ICH */
94 TCO_ICH5, /* ICH5 & ICH5R */
95 TCO_6300ESB, /* 6300ESB */
96 TCO_ICH6, /* ICH6 & ICH6R */
97 TCO_ICH6M, /* ICH6-M */
98 TCO_ICH6W, /* ICH6W & ICH6RW */
99 TCO_ICH7, /* ICH7 & ICH7R */
100 TCO_ICH7M, /* ICH7-M */
101 TCO_ICH7MDH, /* ICH7-M DH */
102 TCO_ICH8, /* ICH8 & ICH8R */
103 TCO_ICH8ME, /* ICH8M-E */
104 TCO_ICH8DH, /* ICH8DH */
105 TCO_ICH8DO, /* ICH8DO */
106 TCO_ICH8M, /* ICH8M */
107 TCO_ICH9, /* ICH9 */
108 TCO_ICH9R, /* ICH9R */
109 TCO_ICH9DH, /* ICH9DH */
110 TCO_ICH9DO, /* ICH9DO */
111 TCO_631XESB, /* 631xESB/632xESB */
112 };
113
114 static struct {
115 char *name;
116 unsigned int iTCO_version;
117 } iTCO_chipset_info[] __devinitdata = {
118 {"ICH", 1},
119 {"ICH0", 1},
120 {"ICH2", 1},
121 {"ICH2-M", 1},
122 {"ICH3-S", 1},
123 {"ICH3-M", 1},
124 {"ICH4", 1},
125 {"ICH4-M", 1},
126 {"C-ICH", 1},
127 {"ICH5 or ICH5R", 1},
128 {"6300ESB", 1},
129 {"ICH6 or ICH6R", 2},
130 {"ICH6-M", 2},
131 {"ICH6W or ICH6RW", 2},
132 {"ICH7 or ICH7R", 2},
133 {"ICH7-M", 2},
134 {"ICH7-M DH", 2},
135 {"ICH8 or ICH8R", 2},
136 {"ICH8M-E", 2},
137 {"ICH8DH", 2},
138 {"ICH8DO", 2},
139 {"ICH8M", 2},
140 {"ICH9", 2},
141 {"ICH9R", 2},
142 {"ICH9DH", 2},
143 {"ICH9DO", 2},
144 {"631xESB/632xESB", 2},
145 {NULL, 0}
146 };
147
148 #define ITCO_PCI_DEVICE(dev, data) \
149 .vendor = PCI_VENDOR_ID_INTEL, \
150 .device = dev, \
151 .subvendor = PCI_ANY_ID, \
152 .subdevice = PCI_ANY_ID, \
153 .class = 0, \
154 .class_mask = 0, \
155 .driver_data = data
156
157 /*
158 * This data only exists for exporting the supported PCI ids
159 * via MODULE_DEVICE_TABLE. We do not actually register a
160 * pci_driver, because the I/O Controller Hub has also other
161 * functions that probably will be registered by other drivers.
162 */
163 static struct pci_device_id iTCO_wdt_pci_tbl[] = {
164 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AA_0, TCO_ICH)},
165 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AB_0, TCO_ICH0)},
166 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_0, TCO_ICH2)},
167 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_10, TCO_ICH2M)},
168 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_0, TCO_ICH3)},
169 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_12, TCO_ICH3M)},
170 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_0, TCO_ICH4)},
171 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_12, TCO_ICH4M)},
172 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801E_0, TCO_CICH)},
173 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801EB_0, TCO_ICH5)},
174 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB_1, TCO_6300ESB)},
175 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_0, TCO_ICH6)},
176 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_1, TCO_ICH6M)},
177 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_2, TCO_ICH6W)},
178 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_0, TCO_ICH7)},
179 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_1, TCO_ICH7M)},
180 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_31, TCO_ICH7MDH)},
181 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_0, TCO_ICH8)},
182 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_1, TCO_ICH8ME)},
183 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_2, TCO_ICH8DH)},
184 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_3, TCO_ICH8DO)},
185 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_4, TCO_ICH8M)},
186 { ITCO_PCI_DEVICE(0x2918, TCO_ICH9)},
187 { ITCO_PCI_DEVICE(0x2916, TCO_ICH9R)},
188 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_2, TCO_ICH9DH)},
189 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_4, TCO_ICH9DO)},
190 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB2_0, TCO_631XESB)},
191 { ITCO_PCI_DEVICE(0x2671, TCO_631XESB)},
192 { ITCO_PCI_DEVICE(0x2672, TCO_631XESB)},
193 { ITCO_PCI_DEVICE(0x2673, TCO_631XESB)},
194 { ITCO_PCI_DEVICE(0x2674, TCO_631XESB)},
195 { ITCO_PCI_DEVICE(0x2675, TCO_631XESB)},
196 { ITCO_PCI_DEVICE(0x2676, TCO_631XESB)},
197 { ITCO_PCI_DEVICE(0x2677, TCO_631XESB)},
198 { ITCO_PCI_DEVICE(0x2678, TCO_631XESB)},
199 { ITCO_PCI_DEVICE(0x2679, TCO_631XESB)},
200 { ITCO_PCI_DEVICE(0x267a, TCO_631XESB)},
201 { ITCO_PCI_DEVICE(0x267b, TCO_631XESB)},
202 { ITCO_PCI_DEVICE(0x267c, TCO_631XESB)},
203 { ITCO_PCI_DEVICE(0x267d, TCO_631XESB)},
204 { ITCO_PCI_DEVICE(0x267e, TCO_631XESB)},
205 { ITCO_PCI_DEVICE(0x267f, TCO_631XESB)},
206 { 0, }, /* End of list */
207 };
208 MODULE_DEVICE_TABLE(pci, iTCO_wdt_pci_tbl);
209
210 /* Address definitions for the TCO */
211 /* TCO base address */
212 #define TCOBASE iTCO_wdt_private.ACPIBASE + 0x60
213 /* SMI Control and Enable Register */
214 #define SMI_EN iTCO_wdt_private.ACPIBASE + 0x30
215
216 #define TCO_RLD TCOBASE + 0x00 /* TCO Timer Reload and Curr. Value */
217 #define TCOv1_TMR TCOBASE + 0x01 /* TCOv1 Timer Initial Value */
218 #define TCO_DAT_IN TCOBASE + 0x02 /* TCO Data In Register */
219 #define TCO_DAT_OUT TCOBASE + 0x03 /* TCO Data Out Register */
220 #define TCO1_STS TCOBASE + 0x04 /* TCO1 Status Register */
221 #define TCO2_STS TCOBASE + 0x06 /* TCO2 Status Register */
222 #define TCO1_CNT TCOBASE + 0x08 /* TCO1 Control Register */
223 #define TCO2_CNT TCOBASE + 0x0a /* TCO2 Control Register */
224 #define TCOv2_TMR TCOBASE + 0x12 /* TCOv2 Timer Initial Value */
225
226 /* internal variables */
227 static unsigned long is_active;
228 static char expect_release;
229 static struct { /* this is private data for the iTCO_wdt device */
230 /* TCO version/generation */
231 unsigned int iTCO_version;
232 /* The cards ACPIBASE address (TCOBASE = ACPIBASE+0x60) */
233 unsigned long ACPIBASE;
234 /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2)*/
235 unsigned long __iomem *gcs;
236 /* the lock for io operations */
237 spinlock_t io_lock;
238 /* the PCI-device */
239 struct pci_dev *pdev;
240 } iTCO_wdt_private;
241
242 /* the watchdog platform device */
243 static struct platform_device *iTCO_wdt_platform_device;
244
245 /* module parameters */
246 #define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */
247 static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
248 module_param(heartbeat, int, 0);
249 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<heartbeat<39 (TCO v1) or 613 (TCO v2), default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
250
251 static int nowayout = WATCHDOG_NOWAYOUT;
252 module_param(nowayout, int, 0);
253 MODULE_PARM_DESC(nowayout,
254 "Watchdog cannot be stopped once started (default="
255 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
256
257 /*
258 * Some TCO specific functions
259 */
260
261 static inline unsigned int seconds_to_ticks(int seconds)
262 {
263 /* the internal timer is stored as ticks which decrement
264 * every 0.6 seconds */
265 return (seconds * 10) / 6;
266 }
267
268 static void iTCO_wdt_set_NO_REBOOT_bit(void)
269 {
270 u32 val32;
271
272 /* Set the NO_REBOOT bit: this disables reboots */
273 if (iTCO_wdt_private.iTCO_version == 2) {
274 val32 = readl(iTCO_wdt_private.gcs);
275 val32 |= 0x00000020;
276 writel(val32, iTCO_wdt_private.gcs);
277 } else if (iTCO_wdt_private.iTCO_version == 1) {
278 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
279 val32 |= 0x00000002;
280 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
281 }
282 }
283
284 static int iTCO_wdt_unset_NO_REBOOT_bit(void)
285 {
286 int ret = 0;
287 u32 val32;
288
289 /* Unset the NO_REBOOT bit: this enables reboots */
290 if (iTCO_wdt_private.iTCO_version == 2) {
291 val32 = readl(iTCO_wdt_private.gcs);
292 val32 &= 0xffffffdf;
293 writel(val32, iTCO_wdt_private.gcs);
294
295 val32 = readl(iTCO_wdt_private.gcs);
296 if (val32 & 0x00000020)
297 ret = -EIO;
298 } else if (iTCO_wdt_private.iTCO_version == 1) {
299 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
300 val32 &= 0xfffffffd;
301 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
302
303 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
304 if (val32 & 0x00000002)
305 ret = -EIO;
306 }
307
308 return ret; /* returns: 0 = OK, -EIO = Error */
309 }
310
311 static int iTCO_wdt_start(void)
312 {
313 unsigned int val;
314
315 spin_lock(&iTCO_wdt_private.io_lock);
316
317 iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat);
318
319 /* disable chipset's NO_REBOOT bit */
320 if (iTCO_wdt_unset_NO_REBOOT_bit()) {
321 spin_unlock(&iTCO_wdt_private.io_lock);
322 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
323 return -EIO;
324 }
325
326 /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
327 val = inw(TCO1_CNT);
328 val &= 0xf7ff;
329 outw(val, TCO1_CNT);
330 val = inw(TCO1_CNT);
331 spin_unlock(&iTCO_wdt_private.io_lock);
332
333 if (val & 0x0800)
334 return -1;
335 return 0;
336 }
337
338 static int iTCO_wdt_stop(void)
339 {
340 unsigned int val;
341
342 spin_lock(&iTCO_wdt_private.io_lock);
343
344 iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE);
345
346 /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
347 val = inw(TCO1_CNT);
348 val |= 0x0800;
349 outw(val, TCO1_CNT);
350 val = inw(TCO1_CNT);
351
352 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
353 iTCO_wdt_set_NO_REBOOT_bit();
354
355 spin_unlock(&iTCO_wdt_private.io_lock);
356
357 if ((val & 0x0800) == 0)
358 return -1;
359 return 0;
360 }
361
362 static int iTCO_wdt_keepalive(void)
363 {
364 spin_lock(&iTCO_wdt_private.io_lock);
365
366 iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat);
367
368 /* Reload the timer by writing to the TCO Timer Counter register */
369 if (iTCO_wdt_private.iTCO_version == 2)
370 outw(0x01, TCO_RLD);
371 else if (iTCO_wdt_private.iTCO_version == 1)
372 outb(0x01, TCO_RLD);
373
374 spin_unlock(&iTCO_wdt_private.io_lock);
375 return 0;
376 }
377
378 static int iTCO_wdt_set_heartbeat(int t)
379 {
380 unsigned int val16;
381 unsigned char val8;
382 unsigned int tmrval;
383
384 tmrval = seconds_to_ticks(t);
385 /* from the specs: */
386 /* "Values of 0h-3h are ignored and should not be attempted" */
387 if (tmrval < 0x04)
388 return -EINVAL;
389 if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) ||
390 ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
391 return -EINVAL;
392
393 iTCO_vendor_pre_set_heartbeat(tmrval);
394
395 /* Write new heartbeat to watchdog */
396 if (iTCO_wdt_private.iTCO_version == 2) {
397 spin_lock(&iTCO_wdt_private.io_lock);
398 val16 = inw(TCOv2_TMR);
399 val16 &= 0xfc00;
400 val16 |= tmrval;
401 outw(val16, TCOv2_TMR);
402 val16 = inw(TCOv2_TMR);
403 spin_unlock(&iTCO_wdt_private.io_lock);
404
405 if ((val16 & 0x3ff) != tmrval)
406 return -EINVAL;
407 } else if (iTCO_wdt_private.iTCO_version == 1) {
408 spin_lock(&iTCO_wdt_private.io_lock);
409 val8 = inb(TCOv1_TMR);
410 val8 &= 0xc0;
411 val8 |= (tmrval & 0xff);
412 outb(val8, TCOv1_TMR);
413 val8 = inb(TCOv1_TMR);
414 spin_unlock(&iTCO_wdt_private.io_lock);
415
416 if ((val8 & 0x3f) != tmrval)
417 return -EINVAL;
418 }
419
420 heartbeat = t;
421 return 0;
422 }
423
424 static int iTCO_wdt_get_timeleft(int *time_left)
425 {
426 unsigned int val16;
427 unsigned char val8;
428
429 /* read the TCO Timer */
430 if (iTCO_wdt_private.iTCO_version == 2) {
431 spin_lock(&iTCO_wdt_private.io_lock);
432 val16 = inw(TCO_RLD);
433 val16 &= 0x3ff;
434 spin_unlock(&iTCO_wdt_private.io_lock);
435
436 *time_left = (val16 * 6) / 10;
437 } else if (iTCO_wdt_private.iTCO_version == 1) {
438 spin_lock(&iTCO_wdt_private.io_lock);
439 val8 = inb(TCO_RLD);
440 val8 &= 0x3f;
441 spin_unlock(&iTCO_wdt_private.io_lock);
442
443 *time_left = (val8 * 6) / 10;
444 } else
445 return -EINVAL;
446 return 0;
447 }
448
449 /*
450 * /dev/watchdog handling
451 */
452
453 static int iTCO_wdt_open(struct inode *inode, struct file *file)
454 {
455 /* /dev/watchdog can only be opened once */
456 if (test_and_set_bit(0, &is_active))
457 return -EBUSY;
458
459 /*
460 * Reload and activate timer
461 */
462 iTCO_wdt_keepalive();
463 iTCO_wdt_start();
464 return nonseekable_open(inode, file);
465 }
466
467 static int iTCO_wdt_release(struct inode *inode, struct file *file)
468 {
469 /*
470 * Shut off the timer.
471 */
472 if (expect_release == 42) {
473 iTCO_wdt_stop();
474 } else {
475 printk(KERN_CRIT PFX
476 "Unexpected close, not stopping watchdog!\n");
477 iTCO_wdt_keepalive();
478 }
479 clear_bit(0, &is_active);
480 expect_release = 0;
481 return 0;
482 }
483
484 static ssize_t iTCO_wdt_write(struct file *file, const char __user *data,
485 size_t len, loff_t *ppos)
486 {
487 /* See if we got the magic character 'V' and reload the timer */
488 if (len) {
489 if (!nowayout) {
490 size_t i;
491
492 /* note: just in case someone wrote the magic
493 character five months ago... */
494 expect_release = 0;
495
496 /* scan to see whether or not we got the
497 magic character */
498 for (i = 0; i != len; i++) {
499 char c;
500 if (get_user(c, data + i))
501 return -EFAULT;
502 if (c == 'V')
503 expect_release = 42;
504 }
505 }
506
507 /* someone wrote to us, we should reload the timer */
508 iTCO_wdt_keepalive();
509 }
510 return len;
511 }
512
513 static long iTCO_wdt_ioctl(struct file *file, unsigned int cmd,
514 unsigned long arg)
515 {
516 int new_options, retval = -EINVAL;
517 int new_heartbeat;
518 void __user *argp = (void __user *)arg;
519 int __user *p = argp;
520 static struct watchdog_info ident = {
521 .options = WDIOF_SETTIMEOUT |
522 WDIOF_KEEPALIVEPING |
523 WDIOF_MAGICCLOSE,
524 .firmware_version = 0,
525 .identity = DRV_NAME,
526 };
527
528 switch (cmd) {
529 case WDIOC_GETSUPPORT:
530 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
531 case WDIOC_GETSTATUS:
532 case WDIOC_GETBOOTSTATUS:
533 return put_user(0, p);
534
535 case WDIOC_SETOPTIONS:
536 {
537 if (get_user(new_options, p))
538 return -EFAULT;
539
540 if (new_options & WDIOS_DISABLECARD) {
541 iTCO_wdt_stop();
542 retval = 0;
543 }
544 if (new_options & WDIOS_ENABLECARD) {
545 iTCO_wdt_keepalive();
546 iTCO_wdt_start();
547 retval = 0;
548 }
549 return retval;
550 }
551 case WDIOC_KEEPALIVE:
552 iTCO_wdt_keepalive();
553 return 0;
554
555 case WDIOC_SETTIMEOUT:
556 {
557 if (get_user(new_heartbeat, p))
558 return -EFAULT;
559 if (iTCO_wdt_set_heartbeat(new_heartbeat))
560 return -EINVAL;
561 iTCO_wdt_keepalive();
562 /* Fall */
563 }
564 case WDIOC_GETTIMEOUT:
565 return put_user(heartbeat, p);
566 case WDIOC_GETTIMELEFT:
567 {
568 int time_left;
569 if (iTCO_wdt_get_timeleft(&time_left))
570 return -EINVAL;
571 return put_user(time_left, p);
572 }
573 default:
574 return -ENOTTY;
575 }
576 }
577
578 /*
579 * Kernel Interfaces
580 */
581
582 static const struct file_operations iTCO_wdt_fops = {
583 .owner = THIS_MODULE,
584 .llseek = no_llseek,
585 .write = iTCO_wdt_write,
586 .unlocked_ioctl = iTCO_wdt_ioctl,
587 .open = iTCO_wdt_open,
588 .release = iTCO_wdt_release,
589 };
590
591 static struct miscdevice iTCO_wdt_miscdev = {
592 .minor = WATCHDOG_MINOR,
593 .name = "watchdog",
594 .fops = &iTCO_wdt_fops,
595 };
596
597 /*
598 * Init & exit routines
599 */
600
601 static int __devinit iTCO_wdt_init(struct pci_dev *pdev,
602 const struct pci_device_id *ent, struct platform_device *dev)
603 {
604 int ret;
605 u32 base_address;
606 unsigned long RCBA;
607 unsigned long val32;
608
609 /*
610 * Find the ACPI/PM base I/O address which is the base
611 * for the TCO registers (TCOBASE=ACPIBASE + 0x60)
612 * ACPIBASE is bits [15:7] from 0x40-0x43
613 */
614 pci_read_config_dword(pdev, 0x40, &base_address);
615 base_address &= 0x0000ff80;
616 if (base_address == 0x00000000) {
617 /* Something's wrong here, ACPIBASE has to be set */
618 printk(KERN_ERR PFX "failed to get TCOBASE address\n");
619 pci_dev_put(pdev);
620 return -ENODEV;
621 }
622 iTCO_wdt_private.iTCO_version =
623 iTCO_chipset_info[ent->driver_data].iTCO_version;
624 iTCO_wdt_private.ACPIBASE = base_address;
625 iTCO_wdt_private.pdev = pdev;
626
627 /* Get the Memory-Mapped GCS register, we need it for the
628 NO_REBOOT flag (TCO v2). To get access to it you have to
629 read RCBA from PCI Config space 0xf0 and use it as base.
630 GCS = RCBA + ICH6_GCS(0x3410). */
631 if (iTCO_wdt_private.iTCO_version == 2) {
632 pci_read_config_dword(pdev, 0xf0, &base_address);
633 RCBA = base_address & 0xffffc000;
634 iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410), 4);
635 }
636
637 /* Check chipset's NO_REBOOT bit */
638 if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
639 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
640 ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
641 goto out;
642 }
643
644 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
645 iTCO_wdt_set_NO_REBOOT_bit();
646
647 /* Set the TCO_EN bit in SMI_EN register */
648 if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
649 printk(KERN_ERR PFX
650 "I/O address 0x%04lx already in use\n", SMI_EN);
651 ret = -EIO;
652 goto out;
653 }
654 val32 = inl(SMI_EN);
655 val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
656 outl(val32, SMI_EN);
657 release_region(SMI_EN, 4);
658
659 /* The TCO I/O registers reside in a 32-byte range pointed to
660 by the TCOBASE value */
661 if (!request_region(TCOBASE, 0x20, "iTCO_wdt")) {
662 printk(KERN_ERR PFX "I/O address 0x%04lx already in use\n",
663 TCOBASE);
664 ret = -EIO;
665 goto out;
666 }
667
668 printk(KERN_INFO PFX
669 "Found a %s TCO device (Version=%d, TCOBASE=0x%04lx)\n",
670 iTCO_chipset_info[ent->driver_data].name,
671 iTCO_chipset_info[ent->driver_data].iTCO_version,
672 TCOBASE);
673
674 /* Clear out the (probably old) status */
675 outb(0, TCO1_STS);
676 outb(3, TCO2_STS);
677
678 /* Make sure the watchdog is not running */
679 iTCO_wdt_stop();
680
681 /* Check that the heartbeat value is within it's range;
682 if not reset to the default */
683 if (iTCO_wdt_set_heartbeat(heartbeat)) {
684 iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
685 printk(KERN_INFO PFX "heartbeat value must be 2 < heartbeat < 39 (TCO v1) or 613 (TCO v2), using %d\n",
686 heartbeat);
687 }
688
689 ret = misc_register(&iTCO_wdt_miscdev);
690 if (ret != 0) {
691 printk(KERN_ERR PFX
692 "cannot register miscdev on minor=%d (err=%d)\n",
693 WATCHDOG_MINOR, ret);
694 goto unreg_region;
695 }
696
697 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
698 heartbeat, nowayout);
699
700 return 0;
701
702 unreg_region:
703 release_region(TCOBASE, 0x20);
704 out:
705 if (iTCO_wdt_private.iTCO_version == 2)
706 iounmap(iTCO_wdt_private.gcs);
707 pci_dev_put(iTCO_wdt_private.pdev);
708 iTCO_wdt_private.ACPIBASE = 0;
709 return ret;
710 }
711
712 static void __devexit iTCO_wdt_cleanup(void)
713 {
714 /* Stop the timer before we leave */
715 if (!nowayout)
716 iTCO_wdt_stop();
717
718 /* Deregister */
719 misc_deregister(&iTCO_wdt_miscdev);
720 release_region(TCOBASE, 0x20);
721 if (iTCO_wdt_private.iTCO_version == 2)
722 iounmap(iTCO_wdt_private.gcs);
723 pci_dev_put(iTCO_wdt_private.pdev);
724 iTCO_wdt_private.ACPIBASE = 0;
725 }
726
727 static int __devinit iTCO_wdt_probe(struct platform_device *dev)
728 {
729 int found = 0;
730 struct pci_dev *pdev = NULL;
731 const struct pci_device_id *ent;
732
733 spin_lock_init(&iTCO_wdt_private.io_lock);
734
735 for_each_pci_dev(pdev) {
736 ent = pci_match_id(iTCO_wdt_pci_tbl, pdev);
737 if (ent) {
738 if (!(iTCO_wdt_init(pdev, ent, dev))) {
739 found++;
740 break;
741 }
742 }
743 }
744
745 if (!found) {
746 printk(KERN_INFO PFX "No card detected\n");
747 return -ENODEV;
748 }
749
750 return 0;
751 }
752
753 static int __devexit iTCO_wdt_remove(struct platform_device *dev)
754 {
755 if (iTCO_wdt_private.ACPIBASE)
756 iTCO_wdt_cleanup();
757
758 return 0;
759 }
760
761 static void iTCO_wdt_shutdown(struct platform_device *dev)
762 {
763 iTCO_wdt_stop();
764 }
765
766 #define iTCO_wdt_suspend NULL
767 #define iTCO_wdt_resume NULL
768
769 static struct platform_driver iTCO_wdt_driver = {
770 .probe = iTCO_wdt_probe,
771 .remove = __devexit_p(iTCO_wdt_remove),
772 .shutdown = iTCO_wdt_shutdown,
773 .suspend = iTCO_wdt_suspend,
774 .resume = iTCO_wdt_resume,
775 .driver = {
776 .owner = THIS_MODULE,
777 .name = DRV_NAME,
778 },
779 };
780
781 static int __init iTCO_wdt_init_module(void)
782 {
783 int err;
784
785 printk(KERN_INFO PFX "Intel TCO WatchDog Timer Driver v%s (%s)\n",
786 DRV_VERSION, DRV_RELDATE);
787
788 err = platform_driver_register(&iTCO_wdt_driver);
789 if (err)
790 return err;
791
792 iTCO_wdt_platform_device = platform_device_register_simple(DRV_NAME,
793 -1, NULL, 0);
794 if (IS_ERR(iTCO_wdt_platform_device)) {
795 err = PTR_ERR(iTCO_wdt_platform_device);
796 goto unreg_platform_driver;
797 }
798
799 return 0;
800
801 unreg_platform_driver:
802 platform_driver_unregister(&iTCO_wdt_driver);
803 return err;
804 }
805
806 static void __exit iTCO_wdt_cleanup_module(void)
807 {
808 platform_device_unregister(iTCO_wdt_platform_device);
809 platform_driver_unregister(&iTCO_wdt_driver);
810 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
811 }
812
813 module_init(iTCO_wdt_init_module);
814 module_exit(iTCO_wdt_cleanup_module);
815
816 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
817 MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
818 MODULE_VERSION(DRV_VERSION);
819 MODULE_LICENSE("GPL");
820 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree