2 * intel TCO Watchdog Driver (Used in i82801 and i6300ESB chipsets)
4 * (c) Copyright 2006-2007 Wim Van Sebroeck <wim@iguana.be>.
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.
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.
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
54 * Includes, defines, variables, module parameters, ...
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 ": "
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(WATCHDOG_MINOR) */
70 #include <linux/watchdog.h> /* For the watchdog specific items */
71 #include <linux/init.h> /* For __init/__exit/... */
72 #include <linux/fs.h> /* For file operations */
73 #include <linux/platform_device.h> /* For platform_driver framework */
74 #include <linux/pci.h> /* For pci functions */
75 #include <linux/ioport.h> /* For io-port access */
76 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
78 #include <asm/uaccess.h> /* For copy_to_user/put_user/... */
79 #include <asm/io.h> /* For inb/outb/... */
81 /* TCO related info */
83 TCO_ICH = 0, /* ICH */
86 TCO_ICH2M, /* ICH2-M */
87 TCO_ICH3, /* ICH3-S */
88 TCO_ICH3M, /* ICH3-M */
90 TCO_ICH4M, /* ICH4-M */
92 TCO_ICH5, /* ICH5 & ICH5R */
93 TCO_6300ESB, /* 6300ESB */
94 TCO_ICH6, /* ICH6 & ICH6R */
95 TCO_ICH6M, /* ICH6-M */
96 TCO_ICH6W, /* ICH6W & ICH6RW */
97 TCO_ICH7, /* ICH7 & ICH7R */
98 TCO_ICH7M, /* ICH7-M */
99 TCO_ICH7MDH, /* ICH7-M DH */
100 TCO_ICH8, /* ICH8 & ICH8R */
101 TCO_ICH8ME, /* ICH8M-E */
102 TCO_ICH8DH, /* ICH8DH */
103 TCO_ICH8DO, /* ICH8DO */
104 TCO_ICH8M, /* ICH8M */
106 TCO_ICH9R, /* ICH9R */
107 TCO_ICH9DH, /* ICH9DH */
108 TCO_ICH9DO, /* ICH9DO */
109 TCO_631XESB, /* 631xESB/632xESB */
114 unsigned int iTCO_version;
115 } iTCO_chipset_info[] __devinitdata = {
125 {"ICH5 or ICH5R", 1},
127 {"ICH6 or ICH6R", 2},
129 {"ICH6W or ICH6RW", 2},
130 {"ICH7 or ICH7R", 2},
133 {"ICH8 or ICH8R", 2},
142 {"631xESB/632xESB", 2},
146 #define ITCO_PCI_DEVICE(dev, data) \
147 .vendor = PCI_VENDOR_ID_INTEL, \
149 .subvendor = PCI_ANY_ID, \
150 .subdevice = PCI_ANY_ID, \
156 * This data only exists for exporting the supported PCI ids
157 * via MODULE_DEVICE_TABLE. We do not actually register a
158 * pci_driver, because the I/O Controller Hub has also other
159 * functions that probably will be registered by other drivers.
161 static struct pci_device_id iTCO_wdt_pci_tbl[] = {
162 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AA_0, TCO_ICH )},
163 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801AB_0, TCO_ICH0 )},
164 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_0, TCO_ICH2 )},
165 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801BA_10, TCO_ICH2M )},
166 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_0, TCO_ICH3 )},
167 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801CA_12, TCO_ICH3M )},
168 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_0, TCO_ICH4 )},
169 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801DB_12, TCO_ICH4M )},
170 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801E_0, TCO_CICH )},
171 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_82801EB_0, TCO_ICH5 )},
172 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB_1, TCO_6300ESB)},
173 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_0, TCO_ICH6 )},
174 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_1, TCO_ICH6M )},
175 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH6_2, TCO_ICH6W )},
176 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_0, TCO_ICH7 )},
177 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_1, TCO_ICH7M )},
178 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH7_31, TCO_ICH7MDH)},
179 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_0, TCO_ICH8 )},
180 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_1, TCO_ICH8ME )},
181 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_2, TCO_ICH8DH )},
182 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_3, TCO_ICH8DO )},
183 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH8_4, TCO_ICH8M )},
184 { ITCO_PCI_DEVICE(0x2918, TCO_ICH9 )},
185 { ITCO_PCI_DEVICE(0x2916, TCO_ICH9R )},
186 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_2, TCO_ICH9DH )},
187 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ICH9_4, TCO_ICH9DO )},
188 { ITCO_PCI_DEVICE(PCI_DEVICE_ID_INTEL_ESB2_0, TCO_631XESB)},
189 { ITCO_PCI_DEVICE(0x2671, TCO_631XESB)},
190 { ITCO_PCI_DEVICE(0x2672, TCO_631XESB)},
191 { ITCO_PCI_DEVICE(0x2673, TCO_631XESB)},
192 { ITCO_PCI_DEVICE(0x2674, TCO_631XESB)},
193 { ITCO_PCI_DEVICE(0x2675, TCO_631XESB)},
194 { ITCO_PCI_DEVICE(0x2676, TCO_631XESB)},
195 { ITCO_PCI_DEVICE(0x2677, TCO_631XESB)},
196 { ITCO_PCI_DEVICE(0x2678, TCO_631XESB)},
197 { ITCO_PCI_DEVICE(0x2679, TCO_631XESB)},
198 { ITCO_PCI_DEVICE(0x267a, TCO_631XESB)},
199 { ITCO_PCI_DEVICE(0x267b, TCO_631XESB)},
200 { ITCO_PCI_DEVICE(0x267c, TCO_631XESB)},
201 { ITCO_PCI_DEVICE(0x267d, TCO_631XESB)},
202 { ITCO_PCI_DEVICE(0x267e, TCO_631XESB)},
203 { ITCO_PCI_DEVICE(0x267f, TCO_631XESB)},
204 { 0, }, /* End of list */
206 MODULE_DEVICE_TABLE (pci, iTCO_wdt_pci_tbl);
208 /* Address definitions for the TCO */
209 #define TCOBASE iTCO_wdt_private.ACPIBASE + 0x60 /* TCO base address */
210 #define SMI_EN iTCO_wdt_private.ACPIBASE + 0x30 /* SMI Control and Enable Register */
212 #define TCO_RLD TCOBASE + 0x00 /* TCO Timer Reload and Current Value */
213 #define TCOv1_TMR TCOBASE + 0x01 /* TCOv1 Timer Initial Value */
214 #define TCO_DAT_IN TCOBASE + 0x02 /* TCO Data In Register */
215 #define TCO_DAT_OUT TCOBASE + 0x03 /* TCO Data Out Register */
216 #define TCO1_STS TCOBASE + 0x04 /* TCO1 Status Register */
217 #define TCO2_STS TCOBASE + 0x06 /* TCO2 Status Register */
218 #define TCO1_CNT TCOBASE + 0x08 /* TCO1 Control Register */
219 #define TCO2_CNT TCOBASE + 0x0a /* TCO2 Control Register */
220 #define TCOv2_TMR TCOBASE + 0x12 /* TCOv2 Timer Initial Value */
222 /* internal variables */
223 static unsigned long is_active;
224 static char expect_release;
225 static struct { /* this is private data for the iTCO_wdt device */
226 unsigned int iTCO_version; /* TCO version/generation */
227 unsigned long ACPIBASE; /* The cards ACPIBASE address (TCOBASE = ACPIBASE+0x60) */
228 unsigned long __iomem *gcs; /* NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2) */
229 spinlock_t io_lock; /* the lock for io operations */
230 struct pci_dev *pdev; /* the PCI-device */
233 static struct platform_device *iTCO_wdt_platform_device; /* the watchdog platform device */
235 /* module parameters */
236 #define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */
237 static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
238 module_param(heartbeat, int, 0);
239 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<heartbeat<39 (TCO v1) or 613 (TCO v2), default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
241 static int nowayout = WATCHDOG_NOWAYOUT;
242 module_param(nowayout, int, 0);
243 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
245 /* iTCO Vendor Specific Support hooks */
246 #ifdef CONFIG_ITCO_VENDOR_SUPPORT
247 extern void iTCO_vendor_pre_start(unsigned long, unsigned int);
248 extern void iTCO_vendor_pre_stop(unsigned long);
249 extern void iTCO_vendor_pre_keepalive(unsigned long, unsigned int);
250 extern void iTCO_vendor_pre_set_heartbeat(unsigned int);
251 extern int iTCO_vendor_check_noreboot_on(void);
253 #define iTCO_vendor_pre_start(acpibase, heartbeat) {}
254 #define iTCO_vendor_pre_stop(acpibase) {}
255 #define iTCO_vendor_pre_keepalive(acpibase,heartbeat) {}
256 #define iTCO_vendor_pre_set_heartbeat(heartbeat) {}
257 #define iTCO_vendor_check_noreboot_on() 1 /* 1=check noreboot; 0=don't check */
261 * Some TCO specific functions
264 static inline unsigned int seconds_to_ticks(int seconds)
266 /* the internal timer is stored as ticks which decrement
267 * every 0.6 seconds */
268 return (seconds * 10) / 6;
271 static void iTCO_wdt_set_NO_REBOOT_bit(void)
275 /* Set the NO_REBOOT bit: this disables reboots */
276 if (iTCO_wdt_private.iTCO_version == 2) {
277 val32 = readl(iTCO_wdt_private.gcs);
279 writel(val32, iTCO_wdt_private.gcs);
280 } else if (iTCO_wdt_private.iTCO_version == 1) {
281 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
283 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
287 static int iTCO_wdt_unset_NO_REBOOT_bit(void)
292 /* Unset the NO_REBOOT bit: this enables reboots */
293 if (iTCO_wdt_private.iTCO_version == 2) {
294 val32 = readl(iTCO_wdt_private.gcs);
296 writel(val32, iTCO_wdt_private.gcs);
298 val32 = readl(iTCO_wdt_private.gcs);
299 if (val32 & 0x00000020)
301 } else if (iTCO_wdt_private.iTCO_version == 1) {
302 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
304 pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
306 pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
307 if (val32 & 0x00000002)
311 return ret; /* returns: 0 = OK, -EIO = Error */
314 static int iTCO_wdt_start(void)
318 spin_lock(&iTCO_wdt_private.io_lock);
320 iTCO_vendor_pre_start(iTCO_wdt_private.ACPIBASE, heartbeat);
322 /* disable chipset's NO_REBOOT bit */
323 if (iTCO_wdt_unset_NO_REBOOT_bit()) {
324 spin_unlock(&iTCO_wdt_private.io_lock);
325 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
329 /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
334 spin_unlock(&iTCO_wdt_private.io_lock);
341 static int iTCO_wdt_stop(void)
345 spin_lock(&iTCO_wdt_private.io_lock);
347 iTCO_vendor_pre_stop(iTCO_wdt_private.ACPIBASE);
349 /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
355 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
356 iTCO_wdt_set_NO_REBOOT_bit();
358 spin_unlock(&iTCO_wdt_private.io_lock);
360 if ((val & 0x0800) == 0)
365 static int iTCO_wdt_keepalive(void)
367 spin_lock(&iTCO_wdt_private.io_lock);
369 iTCO_vendor_pre_keepalive(iTCO_wdt_private.ACPIBASE, heartbeat);
371 /* Reload the timer by writing to the TCO Timer Counter register */
372 if (iTCO_wdt_private.iTCO_version == 2) {
374 } else if (iTCO_wdt_private.iTCO_version == 1) {
378 spin_unlock(&iTCO_wdt_private.io_lock);
382 static int iTCO_wdt_set_heartbeat(int t)
388 tmrval = seconds_to_ticks(t);
389 /* from the specs: */
390 /* "Values of 0h-3h are ignored and should not be attempted" */
393 if (((iTCO_wdt_private.iTCO_version == 2) && (tmrval > 0x3ff)) ||
394 ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
397 iTCO_vendor_pre_set_heartbeat(tmrval);
399 /* Write new heartbeat to watchdog */
400 if (iTCO_wdt_private.iTCO_version == 2) {
401 spin_lock(&iTCO_wdt_private.io_lock);
402 val16 = inw(TCOv2_TMR);
405 outw(val16, TCOv2_TMR);
406 val16 = inw(TCOv2_TMR);
407 spin_unlock(&iTCO_wdt_private.io_lock);
409 if ((val16 & 0x3ff) != tmrval)
411 } else if (iTCO_wdt_private.iTCO_version == 1) {
412 spin_lock(&iTCO_wdt_private.io_lock);
413 val8 = inb(TCOv1_TMR);
415 val8 |= (tmrval & 0xff);
416 outb(val8, TCOv1_TMR);
417 val8 = inb(TCOv1_TMR);
418 spin_unlock(&iTCO_wdt_private.io_lock);
420 if ((val8 & 0x3f) != tmrval)
428 static int iTCO_wdt_get_timeleft (int *time_left)
433 /* read the TCO Timer */
434 if (iTCO_wdt_private.iTCO_version == 2) {
435 spin_lock(&iTCO_wdt_private.io_lock);
436 val16 = inw(TCO_RLD);
438 spin_unlock(&iTCO_wdt_private.io_lock);
440 *time_left = (val16 * 6) / 10;
441 } else if (iTCO_wdt_private.iTCO_version == 1) {
442 spin_lock(&iTCO_wdt_private.io_lock);
445 spin_unlock(&iTCO_wdt_private.io_lock);
447 *time_left = (val8 * 6) / 10;
454 * /dev/watchdog handling
457 static int iTCO_wdt_open (struct inode *inode, struct file *file)
459 /* /dev/watchdog can only be opened once */
460 if (test_and_set_bit(0, &is_active))
464 * Reload and activate timer
466 iTCO_wdt_keepalive();
468 return nonseekable_open(inode, file);
471 static int iTCO_wdt_release (struct inode *inode, struct file *file)
474 * Shut off the timer.
476 if (expect_release == 42) {
479 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
480 iTCO_wdt_keepalive();
482 clear_bit(0, &is_active);
487 static ssize_t iTCO_wdt_write (struct file *file, const char __user *data,
488 size_t len, loff_t * ppos)
490 /* See if we got the magic character 'V' and reload the timer */
495 /* note: just in case someone wrote the magic character
496 * five months ago... */
499 /* scan to see whether or not we got the magic character */
500 for (i = 0; i != len; i++) {
502 if (get_user(c, data+i))
509 /* someone wrote to us, we should reload the timer */
510 iTCO_wdt_keepalive();
515 static int iTCO_wdt_ioctl (struct inode *inode, struct file *file,
516 unsigned int cmd, unsigned long arg)
518 int new_options, retval = -EINVAL;
520 void __user *argp = (void __user *)arg;
521 int __user *p = argp;
522 static struct watchdog_info ident = {
523 .options = WDIOF_SETTIMEOUT |
524 WDIOF_KEEPALIVEPING |
526 .firmware_version = 0,
527 .identity = DRV_NAME,
531 case WDIOC_GETSUPPORT:
532 return copy_to_user(argp, &ident,
533 sizeof (ident)) ? -EFAULT : 0;
535 case WDIOC_GETSTATUS:
536 case WDIOC_GETBOOTSTATUS:
537 return put_user(0, p);
539 case WDIOC_KEEPALIVE:
540 iTCO_wdt_keepalive();
543 case WDIOC_SETOPTIONS:
545 if (get_user(new_options, p))
548 if (new_options & WDIOS_DISABLECARD) {
553 if (new_options & WDIOS_ENABLECARD) {
554 iTCO_wdt_keepalive();
562 case WDIOC_SETTIMEOUT:
564 if (get_user(new_heartbeat, p))
567 if (iTCO_wdt_set_heartbeat(new_heartbeat))
570 iTCO_wdt_keepalive();
574 case WDIOC_GETTIMEOUT:
575 return put_user(heartbeat, p);
577 case WDIOC_GETTIMELEFT:
581 if (iTCO_wdt_get_timeleft(&time_left))
584 return put_user(time_left, p);
596 static const struct file_operations iTCO_wdt_fops = {
597 .owner = THIS_MODULE,
599 .write = iTCO_wdt_write,
600 .ioctl = iTCO_wdt_ioctl,
601 .open = iTCO_wdt_open,
602 .release = iTCO_wdt_release,
605 static struct miscdevice iTCO_wdt_miscdev = {
606 .minor = WATCHDOG_MINOR,
608 .fops = &iTCO_wdt_fops,
612 * Init & exit routines
615 static int __devinit iTCO_wdt_init(struct pci_dev *pdev, const struct pci_device_id *ent, struct platform_device *dev)
623 * Find the ACPI/PM base I/O address which is the base
624 * for the TCO registers (TCOBASE=ACPIBASE + 0x60)
625 * ACPIBASE is bits [15:7] from 0x40-0x43
627 pci_read_config_dword(pdev, 0x40, &base_address);
628 base_address &= 0x0000ff80;
629 if (base_address == 0x00000000) {
630 /* Something's wrong here, ACPIBASE has to be set */
631 printk(KERN_ERR PFX "failed to get TCOBASE address\n");
635 iTCO_wdt_private.iTCO_version = iTCO_chipset_info[ent->driver_data].iTCO_version;
636 iTCO_wdt_private.ACPIBASE = base_address;
637 iTCO_wdt_private.pdev = pdev;
639 /* Get the Memory-Mapped GCS register, we need it for the NO_REBOOT flag (TCO v2) */
640 /* To get access to it you have to read RCBA from PCI Config space 0xf0
641 and use it as base. GCS = RCBA + ICH6_GCS(0x3410). */
642 if (iTCO_wdt_private.iTCO_version == 2) {
643 pci_read_config_dword(pdev, 0xf0, &base_address);
644 RCBA = base_address & 0xffffc000;
645 iTCO_wdt_private.gcs = ioremap((RCBA + 0x3410),4);
648 /* Check chipset's NO_REBOOT bit */
649 if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
650 printk(KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
651 ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
655 /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
656 iTCO_wdt_set_NO_REBOOT_bit();
658 /* Set the TCO_EN bit in SMI_EN register */
659 if (!request_region(SMI_EN, 4, "iTCO_wdt")) {
660 printk(KERN_ERR PFX "I/O address 0x%04lx already in use\n",
666 val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
668 release_region(SMI_EN, 4);
670 /* The TCO I/O registers reside in a 32-byte range pointed to by the TCOBASE value */
671 if (!request_region (TCOBASE, 0x20, "iTCO_wdt")) {
672 printk (KERN_ERR PFX "I/O address 0x%04lx already in use\n",
678 printk(KERN_INFO PFX "Found a %s TCO device (Version=%d, TCOBASE=0x%04lx)\n",
679 iTCO_chipset_info[ent->driver_data].name,
680 iTCO_chipset_info[ent->driver_data].iTCO_version,
683 /* Clear out the (probably old) status */
687 /* Make sure the watchdog is not running */
690 /* Check that the heartbeat value is within it's range ; if not reset to the default */
691 if (iTCO_wdt_set_heartbeat(heartbeat)) {
692 iTCO_wdt_set_heartbeat(WATCHDOG_HEARTBEAT);
693 printk(KERN_INFO PFX "heartbeat value must be 2<heartbeat<39 (TCO v1) or 613 (TCO v2), using %d\n",
697 ret = misc_register(&iTCO_wdt_miscdev);
699 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
700 WATCHDOG_MINOR, ret);
704 printk (KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
705 heartbeat, nowayout);
710 release_region (TCOBASE, 0x20);
712 if (iTCO_wdt_private.iTCO_version == 2)
713 iounmap(iTCO_wdt_private.gcs);
714 pci_dev_put(iTCO_wdt_private.pdev);
715 iTCO_wdt_private.ACPIBASE = 0;
719 static void __devexit iTCO_wdt_cleanup(void)
721 /* Stop the timer before we leave */
726 misc_deregister(&iTCO_wdt_miscdev);
727 release_region(TCOBASE, 0x20);
728 if (iTCO_wdt_private.iTCO_version == 2)
729 iounmap(iTCO_wdt_private.gcs);
730 pci_dev_put(iTCO_wdt_private.pdev);
731 iTCO_wdt_private.ACPIBASE = 0;
734 static int __devinit iTCO_wdt_probe(struct platform_device *dev)
737 struct pci_dev *pdev = NULL;
738 const struct pci_device_id *ent;
740 spin_lock_init(&iTCO_wdt_private.io_lock);
742 for_each_pci_dev(pdev) {
743 ent = pci_match_id(iTCO_wdt_pci_tbl, pdev);
745 if (!(iTCO_wdt_init(pdev, ent, dev))) {
753 printk(KERN_INFO PFX "No card detected\n");
760 static int __devexit iTCO_wdt_remove(struct platform_device *dev)
762 if (iTCO_wdt_private.ACPIBASE)
768 static void iTCO_wdt_shutdown(struct platform_device *dev)
773 #define iTCO_wdt_suspend NULL
774 #define iTCO_wdt_resume NULL
776 static struct platform_driver iTCO_wdt_driver = {
777 .probe = iTCO_wdt_probe,
778 .remove = __devexit_p(iTCO_wdt_remove),
779 .shutdown = iTCO_wdt_shutdown,
780 .suspend = iTCO_wdt_suspend,
781 .resume = iTCO_wdt_resume,
783 .owner = THIS_MODULE,
788 static int __init iTCO_wdt_init_module(void)
792 printk(KERN_INFO PFX "Intel TCO WatchDog Timer Driver v%s (%s)\n",
793 DRV_VERSION, DRV_RELDATE);
795 err = platform_driver_register(&iTCO_wdt_driver);
799 iTCO_wdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
800 if (IS_ERR(iTCO_wdt_platform_device)) {
801 err = PTR_ERR(iTCO_wdt_platform_device);
802 goto unreg_platform_driver;
807 unreg_platform_driver:
808 platform_driver_unregister(&iTCO_wdt_driver);
812 static void __exit iTCO_wdt_cleanup_module(void)
814 platform_device_unregister(iTCO_wdt_platform_device);
815 platform_driver_unregister(&iTCO_wdt_driver);
816 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
819 module_init(iTCO_wdt_init_module);
820 module_exit(iTCO_wdt_cleanup_module);
822 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
823 MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
824 MODULE_VERSION(DRV_VERSION);
825 MODULE_LICENSE("GPL");
826 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);