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David Hardemancc90ef02005-08-17 09:07:44 +02001/*
David Hardemanabda5c82005-09-01 22:34:53 +02002 * i6300esb: Watchdog timer driver for Intel 6300ESB chipset
David Hardemancc90ef02005-08-17 09:07:44 +02003 *
4 * (c) Copyright 2004 Google Inc.
Jan Engelhardt96de0e22007-10-19 23:21:04 +02005 * (c) Copyright 2005 David Härdeman <david@2gen.com>
David Hardemancc90ef02005-08-17 09:07:44 +02006 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +000012 * based on i810-tco.c which is in turn based on softdog.c
David Hardemancc90ef02005-08-17 09:07:44 +020013 *
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +000014 * The timer is implemented in the following I/O controller hubs:
15 * (See the intel documentation on http://developer.intel.com.)
16 * 6300ESB chip : document number 300641-003
David Hardemancc90ef02005-08-17 09:07:44 +020017 *
18 * 2004YYZZ Ross Biro
19 * Initial version 0.01
20 * 2004YYZZ Ross Biro
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +000021 * Version 0.02
Jan Engelhardt96de0e22007-10-19 23:21:04 +020022 * 20050210 David Härdeman <david@2gen.com>
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +000023 * Ported driver to kernel 2.6
David Hardemancc90ef02005-08-17 09:07:44 +020024 */
25
26/*
27 * Includes, defines, variables, module parameters, ...
28 */
29
30#include <linux/module.h>
31#include <linux/types.h>
32#include <linux/kernel.h>
33#include <linux/fs.h>
34#include <linux/mm.h>
35#include <linux/miscdevice.h>
36#include <linux/watchdog.h>
37#include <linux/reboot.h>
38#include <linux/init.h>
39#include <linux/pci.h>
40#include <linux/ioport.h>
Alan Cox08292912008-05-19 14:05:57 +010041#include <linux/uaccess.h>
42#include <linux/io.h>
David Hardemancc90ef02005-08-17 09:07:44 +020043
David Hardemancc90ef02005-08-17 09:07:44 +020044/* Module and version information */
45#define ESB_VERSION "0.03"
46#define ESB_MODULE_NAME "i6300ESB timer"
47#define ESB_DRIVER_NAME ESB_MODULE_NAME ", v" ESB_VERSION
48#define PFX ESB_MODULE_NAME ": "
49
David Hardemanabda5c82005-09-01 22:34:53 +020050/* PCI configuration registers */
51#define ESB_CONFIG_REG 0x60 /* Config register */
52#define ESB_LOCK_REG 0x68 /* WDT lock register */
53
54/* Memory mapped registers */
55#define ESB_TIMER1_REG BASEADDR + 0x00 /* Timer1 value after each reset */
56#define ESB_TIMER2_REG BASEADDR + 0x04 /* Timer2 value after each reset */
57#define ESB_GINTSR_REG BASEADDR + 0x08 /* General Interrupt Status Register */
58#define ESB_RELOAD_REG BASEADDR + 0x0c /* Reload register */
59
60/* Lock register bits */
Alan Cox08292912008-05-19 14:05:57 +010061#define ESB_WDT_FUNC (0x01 << 2) /* Watchdog functionality */
62#define ESB_WDT_ENABLE (0x01 << 1) /* Enable WDT */
63#define ESB_WDT_LOCK (0x01 << 0) /* Lock (nowayout) */
David Hardemanabda5c82005-09-01 22:34:53 +020064
65/* Config register bits */
Alan Cox08292912008-05-19 14:05:57 +010066#define ESB_WDT_REBOOT (0x01 << 5) /* Enable reboot on timeout */
67#define ESB_WDT_FREQ (0x01 << 2) /* Decrement frequency */
68#define ESB_WDT_INTTYPE (0x11 << 0) /* Interrupt type on timer1 timeout */
David Hardemanabda5c82005-09-01 22:34:53 +020069
70/* Reload register bits */
Alan Cox08292912008-05-19 14:05:57 +010071#define ESB_WDT_RELOAD (0x01 << 8) /* prevent timeout */
David Hardemanabda5c82005-09-01 22:34:53 +020072
73/* Magic constants */
74#define ESB_UNLOCK1 0x80 /* Step 1 to unlock reset registers */
75#define ESB_UNLOCK2 0x86 /* Step 2 to unlock reset registers */
76
David Hardemancc90ef02005-08-17 09:07:44 +020077/* internal variables */
78static void __iomem *BASEADDR;
Alexey Dobriyanc7dfd0c2007-11-01 16:27:08 -070079static DEFINE_SPINLOCK(esb_lock); /* Guards the hardware */
David Hardemancc90ef02005-08-17 09:07:44 +020080static unsigned long timer_alive;
81static struct pci_dev *esb_pci;
82static unsigned short triggered; /* The status of the watchdog upon boot */
83static char esb_expect_close;
84
85/* module parameters */
Alan Cox08292912008-05-19 14:05:57 +010086/* 30 sec default heartbeat (1 < heartbeat < 2*1023) */
87#define WATCHDOG_HEARTBEAT 30
David Hardemancc90ef02005-08-17 09:07:44 +020088static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
Alan Cox08292912008-05-19 14:05:57 +010089
David Hardemancc90ef02005-08-17 09:07:44 +020090module_param(heartbeat, int, 0);
Alan Cox08292912008-05-19 14:05:57 +010091MODULE_PARM_DESC(heartbeat,
92 "Watchdog heartbeat in seconds. (1<heartbeat<2046, default="
93 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
David Hardemancc90ef02005-08-17 09:07:44 +020094
Naveen Gupta811f9992005-08-21 13:02:41 +020095static int nowayout = WATCHDOG_NOWAYOUT;
David Hardemancc90ef02005-08-17 09:07:44 +020096module_param(nowayout, int, 0);
Alan Cox08292912008-05-19 14:05:57 +010097MODULE_PARM_DESC(nowayout,
98 "Watchdog cannot be stopped once started (default="
99 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
David Hardemancc90ef02005-08-17 09:07:44 +0200100
101/*
102 * Some i6300ESB specific functions
103 */
104
105/*
106 * Prepare for reloading the timer by unlocking the proper registers.
107 * This is performed by first writing 0x80 followed by 0x86 to the
108 * reload register. After this the appropriate registers can be written
109 * to once before they need to be unlocked again.
110 */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000111static inline void esb_unlock_registers(void)
112{
Alan Cox08292912008-05-19 14:05:57 +0100113 writeb(ESB_UNLOCK1, ESB_RELOAD_REG);
114 writeb(ESB_UNLOCK2, ESB_RELOAD_REG);
David Hardemancc90ef02005-08-17 09:07:44 +0200115}
116
117static void esb_timer_start(void)
118{
119 u8 val;
120
121 /* Enable or Enable + Lock? */
Naveen Gupta28562af2005-08-17 09:10:10 +0200122 val = 0x02 | (nowayout ? 0x01 : 0x00);
Alan Cox08292912008-05-19 14:05:57 +0100123 pci_write_config_byte(esb_pci, ESB_LOCK_REG, val);
David Hardemancc90ef02005-08-17 09:07:44 +0200124}
125
126static int esb_timer_stop(void)
127{
128 u8 val;
129
130 spin_lock(&esb_lock);
131 /* First, reset timers as suggested by the docs */
132 esb_unlock_registers();
Naveen Guptace2f50b2005-08-17 09:11:46 +0200133 writew(ESB_WDT_RELOAD, ESB_RELOAD_REG);
David Hardemancc90ef02005-08-17 09:07:44 +0200134 /* Then disable the WDT */
135 pci_write_config_byte(esb_pci, ESB_LOCK_REG, 0x0);
136 pci_read_config_byte(esb_pci, ESB_LOCK_REG, &val);
137 spin_unlock(&esb_lock);
138
139 /* Returns 0 if the timer was disabled, non-zero otherwise */
140 return (val & 0x01);
141}
142
143static void esb_timer_keepalive(void)
144{
145 spin_lock(&esb_lock);
146 esb_unlock_registers();
Naveen Guptace2f50b2005-08-17 09:11:46 +0200147 writew(ESB_WDT_RELOAD, ESB_RELOAD_REG);
Alan Cox08292912008-05-19 14:05:57 +0100148 /* FIXME: Do we need to flush anything here? */
David Hardemancc90ef02005-08-17 09:07:44 +0200149 spin_unlock(&esb_lock);
150}
151
152static int esb_timer_set_heartbeat(int time)
153{
154 u32 val;
155
156 if (time < 0x1 || time > (2 * 0x03ff))
157 return -EINVAL;
158
159 spin_lock(&esb_lock);
160
161 /* We shift by 9, so if we are passed a value of 1 sec,
162 * val will be 1 << 9 = 512, then write that to two
163 * timers => 2 * 512 = 1024 (which is decremented at 1KHz)
164 */
165 val = time << 9;
166
167 /* Write timer 1 */
168 esb_unlock_registers();
169 writel(val, ESB_TIMER1_REG);
170
171 /* Write timer 2 */
172 esb_unlock_registers();
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000173 writel(val, ESB_TIMER2_REG);
David Hardemancc90ef02005-08-17 09:07:44 +0200174
Alan Cox08292912008-05-19 14:05:57 +0100175 /* Reload */
David Hardemancc90ef02005-08-17 09:07:44 +0200176 esb_unlock_registers();
Naveen Guptace2f50b2005-08-17 09:11:46 +0200177 writew(ESB_WDT_RELOAD, ESB_RELOAD_REG);
David Hardemancc90ef02005-08-17 09:07:44 +0200178
179 /* FIXME: Do we need to flush everything out? */
180
181 /* Done */
182 heartbeat = time;
183 spin_unlock(&esb_lock);
184 return 0;
185}
186
Alan Cox08292912008-05-19 14:05:57 +0100187static int esb_timer_read(void)
David Hardemancc90ef02005-08-17 09:07:44 +0200188{
Alan Cox08292912008-05-19 14:05:57 +0100189 u32 count;
David Hardemancc90ef02005-08-17 09:07:44 +0200190
191 /* This isn't documented, and doesn't take into
Alan Cox08292912008-05-19 14:05:57 +0100192 * acount which stage is running, but it looks
193 * like a 20 bit count down, so we might as well report it.
194 */
195 pci_read_config_dword(esb_pci, 0x64, &count);
196 return (int)count;
David Hardemancc90ef02005-08-17 09:07:44 +0200197}
198
199/*
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000200 * /dev/watchdog handling
David Hardemancc90ef02005-08-17 09:07:44 +0200201 */
202
Alan Cox08292912008-05-19 14:05:57 +0100203static int esb_open(struct inode *inode, struct file *file)
David Hardemancc90ef02005-08-17 09:07:44 +0200204{
Alan Cox08292912008-05-19 14:05:57 +0100205 /* /dev/watchdog can only be opened once */
206 if (test_and_set_bit(0, &timer_alive))
207 return -EBUSY;
David Hardemancc90ef02005-08-17 09:07:44 +0200208
Alan Cox08292912008-05-19 14:05:57 +0100209 /* Reload and activate timer */
210 esb_timer_keepalive();
211 esb_timer_start();
David Hardemancc90ef02005-08-17 09:07:44 +0200212
213 return nonseekable_open(inode, file);
214}
215
Alan Cox08292912008-05-19 14:05:57 +0100216static int esb_release(struct inode *inode, struct file *file)
David Hardemancc90ef02005-08-17 09:07:44 +0200217{
Alan Cox08292912008-05-19 14:05:57 +0100218 /* Shut off the timer. */
219 if (esb_expect_close == 42)
220 esb_timer_stop();
221 else {
222 printk(KERN_CRIT PFX
223 "Unexpected close, not stopping watchdog!\n");
224 esb_timer_keepalive();
225 }
226 clear_bit(0, &timer_alive);
227 esb_expect_close = 0;
228 return 0;
David Hardemancc90ef02005-08-17 09:07:44 +0200229}
230
Alan Cox08292912008-05-19 14:05:57 +0100231static ssize_t esb_write(struct file *file, const char __user *data,
232 size_t len, loff_t *ppos)
David Hardemancc90ef02005-08-17 09:07:44 +0200233{
234 /* See if we got the magic character 'V' and reload the timer */
Alan Cox08292912008-05-19 14:05:57 +0100235 if (len) {
David Hardemancc90ef02005-08-17 09:07:44 +0200236 if (!nowayout) {
237 size_t i;
238
239 /* note: just in case someone wrote the magic character
240 * five months ago... */
241 esb_expect_close = 0;
242
243 /* scan to see whether or not we got the magic character */
244 for (i = 0; i != len; i++) {
245 char c;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000246 if (get_user(c, data + i))
David Hardemancc90ef02005-08-17 09:07:44 +0200247 return -EFAULT;
248 if (c == 'V')
249 esb_expect_close = 42;
250 }
251 }
252
253 /* someone wrote to us, we should reload the timer */
Alan Cox08292912008-05-19 14:05:57 +0100254 esb_timer_keepalive();
David Hardemancc90ef02005-08-17 09:07:44 +0200255 }
256 return len;
257}
258
Alan Cox08292912008-05-19 14:05:57 +0100259static long esb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
David Hardemancc90ef02005-08-17 09:07:44 +0200260{
261 int new_options, retval = -EINVAL;
262 int new_heartbeat;
263 void __user *argp = (void __user *)arg;
264 int __user *p = argp;
265 static struct watchdog_info ident = {
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000266 .options = WDIOF_SETTIMEOUT |
David Hardemancc90ef02005-08-17 09:07:44 +0200267 WDIOF_KEEPALIVEPING |
268 WDIOF_MAGICCLOSE,
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000269 .firmware_version = 0,
270 .identity = ESB_MODULE_NAME,
David Hardemancc90ef02005-08-17 09:07:44 +0200271 };
272
273 switch (cmd) {
Alan Cox08292912008-05-19 14:05:57 +0100274 case WDIOC_GETSUPPORT:
275 return copy_to_user(argp, &ident,
276 sizeof(ident)) ? -EFAULT : 0;
David Hardemancc90ef02005-08-17 09:07:44 +0200277
Alan Cox08292912008-05-19 14:05:57 +0100278 case WDIOC_GETSTATUS:
279 return put_user(esb_timer_read(), p);
David Hardemancc90ef02005-08-17 09:07:44 +0200280
Alan Cox08292912008-05-19 14:05:57 +0100281 case WDIOC_GETBOOTSTATUS:
282 return put_user(triggered, p);
David Hardemancc90ef02005-08-17 09:07:44 +0200283
Alan Cox08292912008-05-19 14:05:57 +0100284 case WDIOC_SETOPTIONS:
285 {
286 if (get_user(new_options, p))
287 return -EFAULT;
David Hardemancc90ef02005-08-17 09:07:44 +0200288
Alan Cox08292912008-05-19 14:05:57 +0100289 if (new_options & WDIOS_DISABLECARD) {
290 esb_timer_stop();
291 retval = 0;
292 }
David Hardemancc90ef02005-08-17 09:07:44 +0200293
Alan Cox08292912008-05-19 14:05:57 +0100294 if (new_options & WDIOS_ENABLECARD) {
295 esb_timer_keepalive();
296 esb_timer_start();
297 retval = 0;
298 }
299 return retval;
300 }
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000301 case WDIOC_KEEPALIVE:
302 esb_timer_keepalive();
303 return 0;
304
Alan Cox08292912008-05-19 14:05:57 +0100305 case WDIOC_SETTIMEOUT:
306 {
307 if (get_user(new_heartbeat, p))
308 return -EFAULT;
309 if (esb_timer_set_heartbeat(new_heartbeat))
310 return -EINVAL;
311 esb_timer_keepalive();
312 /* Fall */
313 }
314 case WDIOC_GETTIMEOUT:
315 return put_user(heartbeat, p);
316 default:
317 return -ENOTTY;
318 }
David Hardemancc90ef02005-08-17 09:07:44 +0200319}
320
321/*
322 * Notify system
323 */
324
Alan Cox08292912008-05-19 14:05:57 +0100325static int esb_notify_sys(struct notifier_block *this,
326 unsigned long code, void *unused)
David Hardemancc90ef02005-08-17 09:07:44 +0200327{
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000328 if (code == SYS_DOWN || code == SYS_HALT)
329 esb_timer_stop(); /* Turn the WDT off */
330
Alan Cox08292912008-05-19 14:05:57 +0100331 return NOTIFY_DONE;
David Hardemancc90ef02005-08-17 09:07:44 +0200332}
333
334/*
335 * Kernel Interfaces
336 */
337
Arjan van de Ven62322d22006-07-03 00:24:21 -0700338static const struct file_operations esb_fops = {
Alan Cox08292912008-05-19 14:05:57 +0100339 .owner = THIS_MODULE,
340 .llseek = no_llseek,
341 .write = esb_write,
342 .unlocked_ioctl = esb_ioctl,
343 .open = esb_open,
344 .release = esb_release,
David Hardemancc90ef02005-08-17 09:07:44 +0200345};
346
347static struct miscdevice esb_miscdev = {
Alan Cox08292912008-05-19 14:05:57 +0100348 .minor = WATCHDOG_MINOR,
349 .name = "watchdog",
350 .fops = &esb_fops,
David Hardemancc90ef02005-08-17 09:07:44 +0200351};
352
353static struct notifier_block esb_notifier = {
Alan Cox08292912008-05-19 14:05:57 +0100354 .notifier_call = esb_notify_sys,
David Hardemancc90ef02005-08-17 09:07:44 +0200355};
356
357/*
358 * Data for PCI driver interface
359 *
360 * This data only exists for exporting the supported
361 * PCI ids via MODULE_DEVICE_TABLE. We do not actually
362 * register a pci_driver, because someone else might one day
363 * want to register another driver on the same PCI id.
364 */
365static struct pci_device_id esb_pci_tbl[] = {
Alan Cox08292912008-05-19 14:05:57 +0100366 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_9), },
367 { 0, }, /* End of list */
David Hardemancc90ef02005-08-17 09:07:44 +0200368};
Alan Cox08292912008-05-19 14:05:57 +0100369MODULE_DEVICE_TABLE(pci, esb_pci_tbl);
David Hardemancc90ef02005-08-17 09:07:44 +0200370
371/*
372 * Init & exit routines
373 */
374
Alan Cox08292912008-05-19 14:05:57 +0100375static unsigned char __init esb_getdevice(void)
David Hardemancc90ef02005-08-17 09:07:44 +0200376{
377 u8 val1;
378 unsigned short val2;
Alan Cox08292912008-05-19 14:05:57 +0100379 /*
380 * Find the PCI device
381 */
David Hardemancc90ef02005-08-17 09:07:44 +0200382
Alan Cox08292912008-05-19 14:05:57 +0100383 esb_pci = pci_get_device(PCI_VENDOR_ID_INTEL,
384 PCI_DEVICE_ID_INTEL_ESB_9, NULL);
David Hardemancc90ef02005-08-17 09:07:44 +0200385
Alan Cox08292912008-05-19 14:05:57 +0100386 if (esb_pci) {
387 if (pci_enable_device(esb_pci)) {
388 printk(KERN_ERR PFX "failed to enable device\n");
Naveen Gupta811f9992005-08-21 13:02:41 +0200389 goto err_devput;
David Hardemancc90ef02005-08-17 09:07:44 +0200390 }
391
392 if (pci_request_region(esb_pci, 0, ESB_MODULE_NAME)) {
Alan Cox08292912008-05-19 14:05:57 +0100393 printk(KERN_ERR PFX "failed to request region\n");
David Hardemancc90ef02005-08-17 09:07:44 +0200394 goto err_disable;
395 }
396
Arjan van de Venaf4c2932008-09-28 16:21:43 -0700397 BASEADDR = pci_ioremap_bar(esb_pci, 0);
David Hardemancc90ef02005-08-17 09:07:44 +0200398 if (BASEADDR == NULL) {
Alan Cox08292912008-05-19 14:05:57 +0100399 /* Something's wrong here, BASEADDR has to be set */
400 printk(KERN_ERR PFX "failed to get BASEADDR\n");
401 goto err_release;
402 }
David Hardemancc90ef02005-08-17 09:07:44 +0200403
404 /*
405 * The watchdog has two timers, it can be setup so that the
406 * expiry of timer1 results in an interrupt and the expiry of
407 * timer2 results in a reboot. We set it to not generate
408 * any interrupts as there is not much we can do with it
409 * right now.
410 *
411 * We also enable reboots and set the timer frequency to
412 * the PCI clock divided by 2^15 (approx 1KHz).
413 */
414 pci_write_config_word(esb_pci, ESB_CONFIG_REG, 0x0003);
415
416 /* Check that the WDT isn't already locked */
417 pci_read_config_byte(esb_pci, ESB_LOCK_REG, &val1);
418 if (val1 & ESB_WDT_LOCK)
Alan Cox08292912008-05-19 14:05:57 +0100419 printk(KERN_WARNING PFX "nowayout already set\n");
David Hardemancc90ef02005-08-17 09:07:44 +0200420
421 /* Set the timer to watchdog mode and disable it for now */
422 pci_write_config_byte(esb_pci, ESB_LOCK_REG, 0x00);
423
424 /* Check if the watchdog was previously triggered */
425 esb_unlock_registers();
426 val2 = readw(ESB_RELOAD_REG);
427 triggered = (val2 & (0x01 << 9) >> 9);
428
429 /* Reset trigger flag and timers */
430 esb_unlock_registers();
431 writew((0x11 << 8), ESB_RELOAD_REG);
432
433 /* Done */
434 return 1;
435
436err_release:
437 pci_release_region(esb_pci, 0);
438err_disable:
439 pci_disable_device(esb_pci);
Naveen Gupta811f9992005-08-21 13:02:41 +0200440err_devput:
Jiri Slabyc69af032005-08-17 09:09:13 +0200441 pci_dev_put(esb_pci);
David Hardemancc90ef02005-08-17 09:07:44 +0200442 }
David Hardemancc90ef02005-08-17 09:07:44 +0200443 return 0;
444}
445
Alan Cox08292912008-05-19 14:05:57 +0100446static int __init watchdog_init(void)
David Hardemancc90ef02005-08-17 09:07:44 +0200447{
Alan Cox08292912008-05-19 14:05:57 +0100448 int ret;
David Hardemancc90ef02005-08-17 09:07:44 +0200449
Alan Cox08292912008-05-19 14:05:57 +0100450 /* Check whether or not the hardware watchdog is there */
451 if (!esb_getdevice() || esb_pci == NULL)
452 return -ENODEV;
David Hardemancc90ef02005-08-17 09:07:44 +0200453
Alan Cox08292912008-05-19 14:05:57 +0100454 /* Check that the heartbeat value is within it's range;
455 if not reset to the default */
456 if (esb_timer_set_heartbeat(heartbeat)) {
457 esb_timer_set_heartbeat(WATCHDOG_HEARTBEAT);
458 printk(KERN_INFO PFX
459 "heartbeat value must be 1<heartbeat<2046, using %d\n",
460 heartbeat);
461 }
462 ret = register_reboot_notifier(&esb_notifier);
463 if (ret != 0) {
464 printk(KERN_ERR PFX
465 "cannot register reboot notifier (err=%d)\n", ret);
466 goto err_unmap;
467 }
David Hardemancc90ef02005-08-17 09:07:44 +0200468
Alan Cox08292912008-05-19 14:05:57 +0100469 ret = misc_register(&esb_miscdev);
470 if (ret != 0) {
471 printk(KERN_ERR PFX
472 "cannot register miscdev on minor=%d (err=%d)\n",
473 WATCHDOG_MINOR, ret);
474 goto err_notifier;
475 }
476 esb_timer_stop();
477 printk(KERN_INFO PFX
478 "initialized (0x%p). heartbeat=%d sec (nowayout=%d)\n",
479 BASEADDR, heartbeat, nowayout);
480 return 0;
David Hardemancc90ef02005-08-17 09:07:44 +0200481
482err_notifier:
Alan Cox08292912008-05-19 14:05:57 +0100483 unregister_reboot_notifier(&esb_notifier);
David Hardemancc90ef02005-08-17 09:07:44 +0200484err_unmap:
485 iounmap(BASEADDR);
486/* err_release: */
487 pci_release_region(esb_pci, 0);
488/* err_disable: */
489 pci_disable_device(esb_pci);
Naveen Gupta811f9992005-08-21 13:02:41 +0200490/* err_devput: */
Jiri Slabyc69af032005-08-17 09:09:13 +0200491 pci_dev_put(esb_pci);
Alan Cox08292912008-05-19 14:05:57 +0100492 return ret;
David Hardemancc90ef02005-08-17 09:07:44 +0200493}
494
Alan Cox08292912008-05-19 14:05:57 +0100495static void __exit watchdog_cleanup(void)
David Hardemancc90ef02005-08-17 09:07:44 +0200496{
497 /* Stop the timer before we leave */
498 if (!nowayout)
Alan Cox08292912008-05-19 14:05:57 +0100499 esb_timer_stop();
David Hardemancc90ef02005-08-17 09:07:44 +0200500
501 /* Deregister */
502 misc_deregister(&esb_miscdev);
Alan Cox08292912008-05-19 14:05:57 +0100503 unregister_reboot_notifier(&esb_notifier);
David Hardemancc90ef02005-08-17 09:07:44 +0200504 iounmap(BASEADDR);
505 pci_release_region(esb_pci, 0);
506 pci_disable_device(esb_pci);
Jiri Slabyc69af032005-08-17 09:09:13 +0200507 pci_dev_put(esb_pci);
David Hardemancc90ef02005-08-17 09:07:44 +0200508}
509
510module_init(watchdog_init);
511module_exit(watchdog_cleanup);
512
Jan Engelhardt96de0e22007-10-19 23:21:04 +0200513MODULE_AUTHOR("Ross Biro and David Härdeman");
David Hardemancc90ef02005-08-17 09:07:44 +0200514MODULE_DESCRIPTION("Watchdog driver for Intel 6300ESB chipsets");
515MODULE_LICENSE("GPL");
516MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);