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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.)
Wim Van Sebroeck0426fd02009-03-19 19:02:44 +000016 * 6300ESB chip : document number 300641-004
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
Joe Perches27c766a2012-02-15 15:06:19 -080030#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
David Hardemancc90ef02005-08-17 09:07:44 +020032#include <linux/module.h>
33#include <linux/types.h>
34#include <linux/kernel.h>
35#include <linux/fs.h>
36#include <linux/mm.h>
37#include <linux/miscdevice.h>
38#include <linux/watchdog.h>
David Hardemancc90ef02005-08-17 09:07:44 +020039#include <linux/init.h>
40#include <linux/pci.h>
41#include <linux/ioport.h>
Alan Cox08292912008-05-19 14:05:57 +010042#include <linux/uaccess.h>
43#include <linux/io.h>
David Hardemancc90ef02005-08-17 09:07:44 +020044
David Hardemancc90ef02005-08-17 09:07:44 +020045/* Module and version information */
Wim Van Sebroeck27860952010-03-08 13:48:01 +000046#define ESB_VERSION "0.05"
David Hardemancc90ef02005-08-17 09:07:44 +020047#define ESB_MODULE_NAME "i6300ESB timer"
48#define ESB_DRIVER_NAME ESB_MODULE_NAME ", v" ESB_VERSION
David Hardemancc90ef02005-08-17 09:07:44 +020049
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 */
Wim Van Sebroeckbd4e6c12009-03-25 19:20:10 +000055#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 */
David Hardemanabda5c82005-09-01 22:34:53 +020059
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 */
Wim Van Sebroeck39f3be72010-03-08 11:02:38 +000068#define ESB_WDT_INTTYPE (0x03 << 0) /* Interrupt type on timer1 timeout */
David Hardemanabda5c82005-09-01 22:34:53 +020069
70/* Reload register bits */
Wim Van Sebroeck31838d92009-03-25 19:14:45 +000071#define ESB_WDT_TIMEOUT (0x01 << 9) /* Watchdog timed out */
Alan Cox08292912008-05-19 14:05:57 +010072#define ESB_WDT_RELOAD (0x01 << 8) /* prevent timeout */
David Hardemanabda5c82005-09-01 22:34:53 +020073
74/* Magic constants */
75#define ESB_UNLOCK1 0x80 /* Step 1 to unlock reset registers */
76#define ESB_UNLOCK2 0x86 /* Step 2 to unlock reset registers */
77
David Hardemancc90ef02005-08-17 09:07:44 +020078/* internal variables */
79static void __iomem *BASEADDR;
Alexey Dobriyanc7dfd0c2007-11-01 16:27:08 -070080static DEFINE_SPINLOCK(esb_lock); /* Guards the hardware */
David Hardemancc90ef02005-08-17 09:07:44 +020081static unsigned long timer_alive;
82static struct pci_dev *esb_pci;
83static unsigned short triggered; /* The status of the watchdog upon boot */
84static char esb_expect_close;
Wim Van Sebroeck27860952010-03-08 13:48:01 +000085
86/* We can only use 1 card due to the /dev/watchdog restriction */
87static int cards_found;
Wim Van Sebroeck0426fd02009-03-19 19:02:44 +000088
David Hardemancc90ef02005-08-17 09:07:44 +020089/* module parameters */
Alan Cox08292912008-05-19 14:05:57 +010090/* 30 sec default heartbeat (1 < heartbeat < 2*1023) */
91#define WATCHDOG_HEARTBEAT 30
David Hardemancc90ef02005-08-17 09:07:44 +020092static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
93module_param(heartbeat, int, 0);
Alan Cox08292912008-05-19 14:05:57 +010094MODULE_PARM_DESC(heartbeat,
95 "Watchdog heartbeat in seconds. (1<heartbeat<2046, default="
96 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
David Hardemancc90ef02005-08-17 09:07:44 +020097
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +010098static bool nowayout = WATCHDOG_NOWAYOUT;
99module_param(nowayout, bool, 0);
Alan Cox08292912008-05-19 14:05:57 +0100100MODULE_PARM_DESC(nowayout,
101 "Watchdog cannot be stopped once started (default="
102 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
David Hardemancc90ef02005-08-17 09:07:44 +0200103
104/*
105 * Some i6300ESB specific functions
106 */
107
108/*
109 * Prepare for reloading the timer by unlocking the proper registers.
110 * This is performed by first writing 0x80 followed by 0x86 to the
111 * reload register. After this the appropriate registers can be written
112 * to once before they need to be unlocked again.
113 */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000114static inline void esb_unlock_registers(void)
115{
Wim Van Sebroeck39f3be72010-03-08 11:02:38 +0000116 writew(ESB_UNLOCK1, ESB_RELOAD_REG);
117 writew(ESB_UNLOCK2, ESB_RELOAD_REG);
David Hardemancc90ef02005-08-17 09:07:44 +0200118}
119
Wim Van Sebroeck3b9d49e2009-03-23 13:50:38 +0000120static int esb_timer_start(void)
David Hardemancc90ef02005-08-17 09:07:44 +0200121{
122 u8 val;
123
Wim Van Sebroeck3b9d49e2009-03-23 13:50:38 +0000124 spin_lock(&esb_lock);
125 esb_unlock_registers();
126 writew(ESB_WDT_RELOAD, ESB_RELOAD_REG);
David Hardemancc90ef02005-08-17 09:07:44 +0200127 /* Enable or Enable + Lock? */
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000128 val = ESB_WDT_ENABLE | (nowayout ? ESB_WDT_LOCK : 0x00);
Alan Cox08292912008-05-19 14:05:57 +0100129 pci_write_config_byte(esb_pci, ESB_LOCK_REG, val);
Wim Van Sebroeck3b9d49e2009-03-23 13:50:38 +0000130 spin_unlock(&esb_lock);
131 return 0;
David Hardemancc90ef02005-08-17 09:07:44 +0200132}
133
134static int esb_timer_stop(void)
135{
136 u8 val;
137
138 spin_lock(&esb_lock);
139 /* First, reset timers as suggested by the docs */
140 esb_unlock_registers();
Naveen Guptace2f50b2005-08-17 09:11:46 +0200141 writew(ESB_WDT_RELOAD, ESB_RELOAD_REG);
David Hardemancc90ef02005-08-17 09:07:44 +0200142 /* Then disable the WDT */
143 pci_write_config_byte(esb_pci, ESB_LOCK_REG, 0x0);
144 pci_read_config_byte(esb_pci, ESB_LOCK_REG, &val);
145 spin_unlock(&esb_lock);
146
147 /* Returns 0 if the timer was disabled, non-zero otherwise */
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000148 return val & ESB_WDT_ENABLE;
David Hardemancc90ef02005-08-17 09:07:44 +0200149}
150
151static void esb_timer_keepalive(void)
152{
153 spin_lock(&esb_lock);
154 esb_unlock_registers();
Naveen Guptace2f50b2005-08-17 09:11:46 +0200155 writew(ESB_WDT_RELOAD, ESB_RELOAD_REG);
Alan Cox08292912008-05-19 14:05:57 +0100156 /* FIXME: Do we need to flush anything here? */
David Hardemancc90ef02005-08-17 09:07:44 +0200157 spin_unlock(&esb_lock);
158}
159
160static int esb_timer_set_heartbeat(int time)
161{
162 u32 val;
163
164 if (time < 0x1 || time > (2 * 0x03ff))
165 return -EINVAL;
166
167 spin_lock(&esb_lock);
168
169 /* We shift by 9, so if we are passed a value of 1 sec,
170 * val will be 1 << 9 = 512, then write that to two
171 * timers => 2 * 512 = 1024 (which is decremented at 1KHz)
172 */
173 val = time << 9;
174
175 /* Write timer 1 */
176 esb_unlock_registers();
177 writel(val, ESB_TIMER1_REG);
178
179 /* Write timer 2 */
180 esb_unlock_registers();
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000181 writel(val, ESB_TIMER2_REG);
David Hardemancc90ef02005-08-17 09:07:44 +0200182
Alan Cox08292912008-05-19 14:05:57 +0100183 /* Reload */
David Hardemancc90ef02005-08-17 09:07:44 +0200184 esb_unlock_registers();
Naveen Guptace2f50b2005-08-17 09:11:46 +0200185 writew(ESB_WDT_RELOAD, ESB_RELOAD_REG);
David Hardemancc90ef02005-08-17 09:07:44 +0200186
187 /* FIXME: Do we need to flush everything out? */
188
189 /* Done */
190 heartbeat = time;
191 spin_unlock(&esb_lock);
192 return 0;
193}
194
David Hardemancc90ef02005-08-17 09:07:44 +0200195/*
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000196 * /dev/watchdog handling
David Hardemancc90ef02005-08-17 09:07:44 +0200197 */
198
Alan Cox08292912008-05-19 14:05:57 +0100199static int esb_open(struct inode *inode, struct file *file)
David Hardemancc90ef02005-08-17 09:07:44 +0200200{
Alan Cox08292912008-05-19 14:05:57 +0100201 /* /dev/watchdog can only be opened once */
202 if (test_and_set_bit(0, &timer_alive))
203 return -EBUSY;
David Hardemancc90ef02005-08-17 09:07:44 +0200204
Alan Cox08292912008-05-19 14:05:57 +0100205 /* Reload and activate timer */
Alan Cox08292912008-05-19 14:05:57 +0100206 esb_timer_start();
David Hardemancc90ef02005-08-17 09:07:44 +0200207
208 return nonseekable_open(inode, file);
209}
210
Alan Cox08292912008-05-19 14:05:57 +0100211static int esb_release(struct inode *inode, struct file *file)
David Hardemancc90ef02005-08-17 09:07:44 +0200212{
Alan Cox08292912008-05-19 14:05:57 +0100213 /* Shut off the timer. */
214 if (esb_expect_close == 42)
215 esb_timer_stop();
216 else {
Joe Perches27c766a2012-02-15 15:06:19 -0800217 pr_crit("Unexpected close, not stopping watchdog!\n");
Alan Cox08292912008-05-19 14:05:57 +0100218 esb_timer_keepalive();
219 }
220 clear_bit(0, &timer_alive);
221 esb_expect_close = 0;
222 return 0;
David Hardemancc90ef02005-08-17 09:07:44 +0200223}
224
Alan Cox08292912008-05-19 14:05:57 +0100225static ssize_t esb_write(struct file *file, const char __user *data,
226 size_t len, loff_t *ppos)
David Hardemancc90ef02005-08-17 09:07:44 +0200227{
228 /* See if we got the magic character 'V' and reload the timer */
Alan Cox08292912008-05-19 14:05:57 +0100229 if (len) {
David Hardemancc90ef02005-08-17 09:07:44 +0200230 if (!nowayout) {
231 size_t i;
232
233 /* note: just in case someone wrote the magic character
234 * five months ago... */
235 esb_expect_close = 0;
236
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +0000237 /* scan to see whether or not we got the
238 * magic character */
David Hardemancc90ef02005-08-17 09:07:44 +0200239 for (i = 0; i != len; i++) {
240 char c;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000241 if (get_user(c, data + i))
David Hardemancc90ef02005-08-17 09:07:44 +0200242 return -EFAULT;
243 if (c == 'V')
244 esb_expect_close = 42;
245 }
246 }
247
248 /* someone wrote to us, we should reload the timer */
Alan Cox08292912008-05-19 14:05:57 +0100249 esb_timer_keepalive();
David Hardemancc90ef02005-08-17 09:07:44 +0200250 }
251 return len;
252}
253
Alan Cox08292912008-05-19 14:05:57 +0100254static long esb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
David Hardemancc90ef02005-08-17 09:07:44 +0200255{
256 int new_options, retval = -EINVAL;
257 int new_heartbeat;
258 void __user *argp = (void __user *)arg;
259 int __user *p = argp;
Wim Van Sebroeck42747d72009-12-26 18:55:22 +0000260 static const struct watchdog_info ident = {
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000261 .options = WDIOF_SETTIMEOUT |
David Hardemancc90ef02005-08-17 09:07:44 +0200262 WDIOF_KEEPALIVEPING |
263 WDIOF_MAGICCLOSE,
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000264 .firmware_version = 0,
265 .identity = ESB_MODULE_NAME,
David Hardemancc90ef02005-08-17 09:07:44 +0200266 };
267
268 switch (cmd) {
Alan Cox08292912008-05-19 14:05:57 +0100269 case WDIOC_GETSUPPORT:
270 return copy_to_user(argp, &ident,
271 sizeof(ident)) ? -EFAULT : 0;
David Hardemancc90ef02005-08-17 09:07:44 +0200272
Alan Cox08292912008-05-19 14:05:57 +0100273 case WDIOC_GETSTATUS:
Wim Van Sebroeck31838d92009-03-25 19:14:45 +0000274 return put_user(0, p);
David Hardemancc90ef02005-08-17 09:07:44 +0200275
Alan Cox08292912008-05-19 14:05:57 +0100276 case WDIOC_GETBOOTSTATUS:
277 return put_user(triggered, p);
David Hardemancc90ef02005-08-17 09:07:44 +0200278
Alan Cox08292912008-05-19 14:05:57 +0100279 case WDIOC_SETOPTIONS:
280 {
281 if (get_user(new_options, p))
282 return -EFAULT;
David Hardemancc90ef02005-08-17 09:07:44 +0200283
Alan Cox08292912008-05-19 14:05:57 +0100284 if (new_options & WDIOS_DISABLECARD) {
285 esb_timer_stop();
286 retval = 0;
287 }
David Hardemancc90ef02005-08-17 09:07:44 +0200288
Alan Cox08292912008-05-19 14:05:57 +0100289 if (new_options & WDIOS_ENABLECARD) {
Alan Cox08292912008-05-19 14:05:57 +0100290 esb_timer_start();
291 retval = 0;
292 }
293 return retval;
294 }
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000295 case WDIOC_KEEPALIVE:
296 esb_timer_keepalive();
297 return 0;
298
Alan Cox08292912008-05-19 14:05:57 +0100299 case WDIOC_SETTIMEOUT:
300 {
301 if (get_user(new_heartbeat, p))
302 return -EFAULT;
303 if (esb_timer_set_heartbeat(new_heartbeat))
304 return -EINVAL;
305 esb_timer_keepalive();
306 /* Fall */
307 }
308 case WDIOC_GETTIMEOUT:
309 return put_user(heartbeat, p);
310 default:
311 return -ENOTTY;
312 }
David Hardemancc90ef02005-08-17 09:07:44 +0200313}
314
315/*
David Hardemancc90ef02005-08-17 09:07:44 +0200316 * Kernel Interfaces
317 */
318
Arjan van de Ven62322d22006-07-03 00:24:21 -0700319static const struct file_operations esb_fops = {
Alan Cox08292912008-05-19 14:05:57 +0100320 .owner = THIS_MODULE,
321 .llseek = no_llseek,
322 .write = esb_write,
323 .unlocked_ioctl = esb_ioctl,
324 .open = esb_open,
325 .release = esb_release,
David Hardemancc90ef02005-08-17 09:07:44 +0200326};
327
328static struct miscdevice esb_miscdev = {
Alan Cox08292912008-05-19 14:05:57 +0100329 .minor = WATCHDOG_MINOR,
330 .name = "watchdog",
331 .fops = &esb_fops,
David Hardemancc90ef02005-08-17 09:07:44 +0200332};
333
David Hardemancc90ef02005-08-17 09:07:44 +0200334/*
335 * Data for PCI driver interface
David Hardemancc90ef02005-08-17 09:07:44 +0200336 */
Wim Van Sebroeck4562f532011-02-21 12:16:44 +0000337static DEFINE_PCI_DEVICE_TABLE(esb_pci_tbl) = {
Alan Cox08292912008-05-19 14:05:57 +0100338 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_9), },
339 { 0, }, /* End of list */
David Hardemancc90ef02005-08-17 09:07:44 +0200340};
Alan Cox08292912008-05-19 14:05:57 +0100341MODULE_DEVICE_TABLE(pci, esb_pci_tbl);
David Hardemancc90ef02005-08-17 09:07:44 +0200342
343/*
344 * Init & exit routines
345 */
346
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000347static unsigned char __devinit esb_getdevice(struct pci_dev *pdev)
David Hardemancc90ef02005-08-17 09:07:44 +0200348{
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000349 if (pci_enable_device(pdev)) {
Joe Perches27c766a2012-02-15 15:06:19 -0800350 pr_err("failed to enable device\n");
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000351 goto err_devput;
352 }
David Hardemancc90ef02005-08-17 09:07:44 +0200353
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000354 if (pci_request_region(pdev, 0, ESB_MODULE_NAME)) {
Joe Perches27c766a2012-02-15 15:06:19 -0800355 pr_err("failed to request region\n");
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000356 goto err_disable;
357 }
David Hardemancc90ef02005-08-17 09:07:44 +0200358
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000359 BASEADDR = pci_ioremap_bar(pdev, 0);
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000360 if (BASEADDR == NULL) {
361 /* Something's wrong here, BASEADDR has to be set */
Joe Perches27c766a2012-02-15 15:06:19 -0800362 pr_err("failed to get BASEADDR\n");
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000363 goto err_release;
364 }
David Hardemancc90ef02005-08-17 09:07:44 +0200365
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000366 /* Done */
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000367 esb_pci = pdev;
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000368 return 1;
David Hardemancc90ef02005-08-17 09:07:44 +0200369
370err_release:
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000371 pci_release_region(pdev, 0);
David Hardemancc90ef02005-08-17 09:07:44 +0200372err_disable:
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000373 pci_disable_device(pdev);
Naveen Gupta811f9992005-08-21 13:02:41 +0200374err_devput:
David Hardemancc90ef02005-08-17 09:07:44 +0200375 return 0;
376}
377
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000378static void __devinit esb_initdevice(void)
379{
380 u8 val1;
381 u16 val2;
382
383 /*
384 * Config register:
385 * Bit 5 : 0 = Enable WDT_OUTPUT
386 * Bit 2 : 0 = set the timer frequency to the PCI clock
387 * divided by 2^15 (approx 1KHz).
388 * Bits 1:0 : 11 = WDT_INT_TYPE Disabled.
389 * The watchdog has two timers, it can be setup so that the
390 * expiry of timer1 results in an interrupt and the expiry of
391 * timer2 results in a reboot. We set it to not generate
392 * any interrupts as there is not much we can do with it
393 * right now.
394 */
395 pci_write_config_word(esb_pci, ESB_CONFIG_REG, 0x0003);
396
397 /* Check that the WDT isn't already locked */
398 pci_read_config_byte(esb_pci, ESB_LOCK_REG, &val1);
399 if (val1 & ESB_WDT_LOCK)
Joe Perches27c766a2012-02-15 15:06:19 -0800400 pr_warn("nowayout already set\n");
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000401
402 /* Set the timer to watchdog mode and disable it for now */
403 pci_write_config_byte(esb_pci, ESB_LOCK_REG, 0x00);
404
405 /* Check if the watchdog was previously triggered */
406 esb_unlock_registers();
407 val2 = readw(ESB_RELOAD_REG);
408 if (val2 & ESB_WDT_TIMEOUT)
409 triggered = WDIOF_CARDRESET;
410
411 /* Reset WDT_TIMEOUT flag and timers */
412 esb_unlock_registers();
413 writew((ESB_WDT_TIMEOUT | ESB_WDT_RELOAD), ESB_RELOAD_REG);
414
415 /* And set the correct timeout value */
416 esb_timer_set_heartbeat(heartbeat);
417}
418
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000419static int __devinit esb_probe(struct pci_dev *pdev,
420 const struct pci_device_id *ent)
David Hardemancc90ef02005-08-17 09:07:44 +0200421{
Alan Cox08292912008-05-19 14:05:57 +0100422 int ret;
David Hardemancc90ef02005-08-17 09:07:44 +0200423
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000424 cards_found++;
425 if (cards_found == 1)
Joe Perches27c766a2012-02-15 15:06:19 -0800426 pr_info("Intel 6300ESB WatchDog Timer Driver v%s\n",
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000427 ESB_VERSION);
428
429 if (cards_found > 1) {
Joe Perches27c766a2012-02-15 15:06:19 -0800430 pr_err("This driver only supports 1 device\n");
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000431 return -ENODEV;
432 }
433
Alan Cox08292912008-05-19 14:05:57 +0100434 /* Check whether or not the hardware watchdog is there */
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000435 if (!esb_getdevice(pdev) || esb_pci == NULL)
Alan Cox08292912008-05-19 14:05:57 +0100436 return -ENODEV;
David Hardemancc90ef02005-08-17 09:07:44 +0200437
Alan Cox08292912008-05-19 14:05:57 +0100438 /* Check that the heartbeat value is within it's range;
439 if not reset to the default */
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000440 if (heartbeat < 0x1 || heartbeat > 2 * 0x03ff) {
441 heartbeat = WATCHDOG_HEARTBEAT;
Joe Perches27c766a2012-02-15 15:06:19 -0800442 pr_info("heartbeat value must be 1<heartbeat<2046, using %d\n",
443 heartbeat);
Alan Cox08292912008-05-19 14:05:57 +0100444 }
David Hardemancc90ef02005-08-17 09:07:44 +0200445
Wim Van Sebroeckfc8a9d82009-03-25 19:16:28 +0000446 /* Initialize the watchdog and make sure it does not run */
447 esb_initdevice();
448
449 /* Register the watchdog so that userspace has access to it */
Alan Cox08292912008-05-19 14:05:57 +0100450 ret = misc_register(&esb_miscdev);
451 if (ret != 0) {
Joe Perches27c766a2012-02-15 15:06:19 -0800452 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
453 WATCHDOG_MINOR, ret);
Wim Van Sebroeck0426fd02009-03-19 19:02:44 +0000454 goto err_unmap;
Alan Cox08292912008-05-19 14:05:57 +0100455 }
Joe Perches27c766a2012-02-15 15:06:19 -0800456 pr_info("initialized (0x%p). heartbeat=%d sec (nowayout=%d)\n",
457 BASEADDR, heartbeat, nowayout);
Alan Cox08292912008-05-19 14:05:57 +0100458 return 0;
David Hardemancc90ef02005-08-17 09:07:44 +0200459
David Hardemancc90ef02005-08-17 09:07:44 +0200460err_unmap:
461 iounmap(BASEADDR);
David Hardemancc90ef02005-08-17 09:07:44 +0200462 pci_release_region(esb_pci, 0);
David Hardemancc90ef02005-08-17 09:07:44 +0200463 pci_disable_device(esb_pci);
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000464 esb_pci = NULL;
Alan Cox08292912008-05-19 14:05:57 +0100465 return ret;
David Hardemancc90ef02005-08-17 09:07:44 +0200466}
467
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000468static void __devexit esb_remove(struct pci_dev *pdev)
David Hardemancc90ef02005-08-17 09:07:44 +0200469{
470 /* Stop the timer before we leave */
471 if (!nowayout)
Alan Cox08292912008-05-19 14:05:57 +0100472 esb_timer_stop();
David Hardemancc90ef02005-08-17 09:07:44 +0200473
474 /* Deregister */
475 misc_deregister(&esb_miscdev);
David Hardemancc90ef02005-08-17 09:07:44 +0200476 iounmap(BASEADDR);
477 pci_release_region(esb_pci, 0);
478 pci_disable_device(esb_pci);
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000479 esb_pci = NULL;
Wim Van Sebroeck0426fd02009-03-19 19:02:44 +0000480}
481
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000482static void esb_shutdown(struct pci_dev *pdev)
Wim Van Sebroeck0426fd02009-03-19 19:02:44 +0000483{
484 esb_timer_stop();
485}
486
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000487static struct pci_driver esb_driver = {
488 .name = ESB_MODULE_NAME,
489 .id_table = esb_pci_tbl,
Wim Van Sebroeck0426fd02009-03-19 19:02:44 +0000490 .probe = esb_probe,
491 .remove = __devexit_p(esb_remove),
492 .shutdown = esb_shutdown,
Wim Van Sebroeck0426fd02009-03-19 19:02:44 +0000493};
494
495static int __init watchdog_init(void)
496{
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000497 return pci_register_driver(&esb_driver);
Wim Van Sebroeck0426fd02009-03-19 19:02:44 +0000498}
499
500static void __exit watchdog_cleanup(void)
501{
Wim Van Sebroeck27860952010-03-08 13:48:01 +0000502 pci_unregister_driver(&esb_driver);
Joe Perches27c766a2012-02-15 15:06:19 -0800503 pr_info("Watchdog Module Unloaded\n");
David Hardemancc90ef02005-08-17 09:07:44 +0200504}
505
506module_init(watchdog_init);
507module_exit(watchdog_cleanup);
508
Jan Engelhardt96de0e22007-10-19 23:21:04 +0200509MODULE_AUTHOR("Ross Biro and David Härdeman");
David Hardemancc90ef02005-08-17 09:07:44 +0200510MODULE_DESCRIPTION("Watchdog driver for Intel 6300ESB chipsets");
511MODULE_LICENSE("GPL");
512MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);