blob: aa9512321f3a624abd4d39d7df84ba4ac108cb18 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * PC Watchdog Driver
3 * by Ken Hollis (khollis@bitgate.com)
4 *
Wim Van Sebroeckf9146f22007-01-09 22:38:54 +01005 * Permission granted from Simon Machell (smachell@berkprod.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * Written for the Linux Kernel, and GPLed by Ken Hollis
7 *
8 * 960107 Added request_region routines, modulized the whole thing.
9 * 960108 Fixed end-of-file pointer (Thanks to Dan Hollis), added
10 * WD_TIMEOUT define.
11 * 960216 Added eof marker on the file, and changed verbose messages.
12 * 960716 Made functional and cosmetic changes to the source for
13 * inclusion in Linux 2.0.x kernels, thanks to Alan Cox.
14 * 960717 Removed read/seek routines, replaced with ioctl. Also, added
15 * check_region command due to Alan's suggestion.
16 * 960821 Made changes to compile in newer 2.0.x kernels. Added
17 * "cold reboot sense" entry.
18 * 960825 Made a few changes to code, deleted some defines and made
19 * typedefs to replace them. Made heartbeat reset only available
20 * via ioctl, and removed the write routine.
21 * 960828 Added new items for PC Watchdog Rev.C card.
22 * 960829 Changed around all of the IOCTLs, added new features,
23 * added watchdog disable/re-enable routines. Added firmware
24 * version reporting. Added read routine for temperature.
25 * Removed some extra defines, added an autodetect Revision
26 * routine.
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +000027 * 961006 Revised some documentation, fixed some cosmetic bugs. Made
28 * drivers to panic the system if it's overheating at bootup.
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 * 961118 Changed some verbiage on some of the output, tidied up
30 * code bits, and added compatibility to 2.1.x.
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +000031 * 970912 Enabled board on open and disable on close.
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 * 971107 Took account of recent VFS changes (broke read).
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +000033 * 971210 Disable board on initialisation in case board already ticking.
34 * 971222 Changed open/close for temperature handling
35 * Michael Meskes <meskes@debian.org>.
36 * 980112 Used minor numbers from include/linux/miscdevice.h
37 * 990403 Clear reset status after reading control status register in
38 * pcwd_showprevstate(). [Marc Boucher <marc@mbsi.ca>]
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 * 990605 Made changes to code to support Firmware 1.22a, added
40 * fairly useless proc entry.
41 * 990610 removed said useless proc code for the merge <alan>
42 * 000403 Removed last traces of proc code. <davej>
Alan Cox261dcc72008-05-19 14:07:43 +010043 * 011214 Added nowayout module option to override
44 * CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com>
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +000045 * Added timeout module option to override default
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 */
47
48/*
49 * A bells and whistles driver is available from http://www.pcwd.de/
Alan Cox261dcc72008-05-19 14:07:43 +010050 * More info available at http://www.berkprod.com/ or
51 * http://www.pcwatchdog.com/
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 */
53
Wim Van Sebroeckfd41fa62005-12-10 14:22:37 +010054#include <linux/module.h> /* For module specific items */
55#include <linux/moduleparam.h> /* For new moduleparam's */
56#include <linux/types.h> /* For standard types (like size_t) */
57#include <linux/errno.h> /* For the -ENODEV/... values */
58#include <linux/kernel.h> /* For printk/panic/... */
59#include <linux/delay.h> /* For mdelay function */
60#include <linux/timer.h> /* For timer related operations */
61#include <linux/jiffies.h> /* For jiffies stuff */
62#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
63#include <linux/watchdog.h> /* For the watchdog specific items */
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +000064#include <linux/reboot.h> /* For kernel_power_off() */
Wim Van Sebroeckfd41fa62005-12-10 14:22:37 +010065#include <linux/init.h> /* For __init/__exit/... */
66#include <linux/fs.h> /* For file operations */
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +000067#include <linux/isa.h> /* For isa devices */
Wim Van Sebroeckfd41fa62005-12-10 14:22:37 +010068#include <linux/ioport.h> /* For io-port access */
69#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
Alan Cox261dcc72008-05-19 14:07:43 +010070#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
71#include <linux/io.h> /* For inb/outb/... */
Wim Van Sebroeckfd41fa62005-12-10 14:22:37 +010072
73/* Module and version information */
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +000074#define WATCHDOG_VERSION "1.20"
75#define WATCHDOG_DATE "18 Feb 2007"
Wim Van Sebroecka7122f92006-01-09 22:07:22 +010076#define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog"
77#define WATCHDOG_NAME "pcwd"
78#define PFX WATCHDOG_NAME ": "
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +000079#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81/*
82 * It should be noted that PCWD_REVISION_B was removed because A and B
83 * are essentially the same types of card, with the exception that B
84 * has temperature reporting. Since I didn't receive a Rev.B card,
85 * the Rev.B card is not supported. (It's a good thing too, as they
86 * are no longer in production.)
87 */
88#define PCWD_REVISION_A 1
89#define PCWD_REVISION_C 2
90
91/*
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +000092 * These are the auto-probe addresses available.
93 *
94 * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350.
95 * Revision A has an address range of 2 addresses, while Revision C has 4.
96 */
97#define PCWD_ISA_NR_CARDS 3
98static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 };
99
100/*
Wim Van Sebroeck8f0235d2006-01-09 21:56:09 +0100101 * These are the defines that describe the control status bits for the
102 * PCI-PC Watchdog card.
103*/
104/* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100105#define WD_WDRST 0x01 /* Previously reset state */
106#define WD_T110 0x02 /* Temperature overheat sense */
107#define WD_HRTBT 0x04 /* Heartbeat sense */
108#define WD_RLY2 0x08 /* External relay triggered */
109#define WD_SRLY2 0x80 /* Software external relay triggered */
Wim Van Sebroeck8f0235d2006-01-09 21:56:09 +0100110/* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100111#define WD_REVC_WTRP 0x01 /* Watchdog Trip status */
112#define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */
113#define WD_REVC_TTRP 0x04 /* Temperature Trip status */
Alan Cox261dcc72008-05-19 14:07:43 +0100114#define WD_REVC_RL2A 0x08 /* Relay 2 activated by
115 on-board processor */
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100116#define WD_REVC_RL1A 0x10 /* Relay 1 active */
117#define WD_REVC_R2DS 0x40 /* Relay 2 disable */
118#define WD_REVC_RLY2 0x80 /* Relay 2 activated? */
Wim Van Sebroeck8f0235d2006-01-09 21:56:09 +0100119/* Port 2 : Control Status #2 */
120#define WD_WDIS 0x10 /* Watchdog Disabled */
121#define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */
Alan Cox261dcc72008-05-19 14:07:43 +0100122#define WD_SSEL 0x40 /* Watchdog Switch Select
123 (1:SW1 <-> 0:SW2) */
Wim Van Sebroeck8f0235d2006-01-09 21:56:09 +0100124#define WD_WCMD 0x80 /* Watchdog Command Mode */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126/* max. time we give an ISA watchdog card to process a command */
127/* 500ms for each 4 bit response (according to spec.) */
128#define ISA_COMMAND_TIMEOUT 1000
129
130/* Watchdog's internal commands */
Wim Van Sebroeckfd41fa62005-12-10 14:22:37 +0100131#define CMD_ISA_IDLE 0x00
132#define CMD_ISA_VERSION_INTEGER 0x01
133#define CMD_ISA_VERSION_TENTH 0x02
134#define CMD_ISA_VERSION_HUNDRETH 0x03
135#define CMD_ISA_VERSION_MINOR 0x04
136#define CMD_ISA_SWITCH_SETTINGS 0x05
Wim Van Sebroeck369fa252006-02-12 17:44:57 +0100137#define CMD_ISA_RESET_PC 0x06
138#define CMD_ISA_ARM_0 0x07
139#define CMD_ISA_ARM_30 0x08
140#define CMD_ISA_ARM_60 0x09
Wim Van Sebroeckfd41fa62005-12-10 14:22:37 +0100141#define CMD_ISA_DELAY_TIME_2SECS 0x0A
142#define CMD_ISA_DELAY_TIME_4SECS 0x0B
143#define CMD_ISA_DELAY_TIME_8SECS 0x0C
Wim Van Sebroeck369fa252006-02-12 17:44:57 +0100144#define CMD_ISA_RESET_RELAYS 0x0D
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Wim Van Sebroeckf3dc0732007-01-09 22:43:49 +0100146/* Watchdog's Dip Switch heartbeat values */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000147static const int heartbeat_tbl[] = {
Wim Van Sebroeckf3dc0732007-01-09 22:43:49 +0100148 20, /* OFF-OFF-OFF = 20 Sec */
149 40, /* OFF-OFF-ON = 40 Sec */
150 60, /* OFF-ON-OFF = 1 Min */
151 300, /* OFF-ON-ON = 5 Min */
152 600, /* ON-OFF-OFF = 10 Min */
153 1800, /* ON-OFF-ON = 30 Min */
154 3600, /* ON-ON-OFF = 1 Hour */
155 7200, /* ON-ON-ON = 2 hour */
156};
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158/*
159 * We are using an kernel timer to do the pinging of the watchdog
160 * every ~500ms. We try to set the internal heartbeat of the
161 * watchdog to 2 ms.
162 */
163
164#define WDT_INTERVAL (HZ/2+1)
165
166/* We can only use 1 card due to the /dev/watchdog restriction */
167static int cards_found;
168
169/* internal variables */
Wim Van Sebroeck36cbaa82008-08-10 21:57:03 +0000170static unsigned long open_allowed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171static char expect_close;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172static int temp_panic;
Alan Cox261dcc72008-05-19 14:07:43 +0100173
174/* this is private data for each ISA-PC watchdog card */
175static struct {
Wim Van Sebroeck2891b6a2006-02-12 16:47:34 +0100176 char fw_ver_str[6]; /* The cards firmware version */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100177 int revision; /* The card's revision */
Alan Cox261dcc72008-05-19 14:07:43 +0100178 int supports_temp; /* Whether or not the card has
179 a temperature device */
180 int command_mode; /* Whether or not the card is in
181 command mode */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100182 int boot_status; /* The card's boot status */
183 int io_addr; /* The cards I/O address */
184 spinlock_t io_lock; /* the lock for io operations */
185 struct timer_list timer; /* The timer that pings the watchdog */
186 unsigned long next_heartbeat; /* the next_heartbeat for the timer */
187} pcwd_private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
189/* module parameters */
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100190#define QUIET 0 /* Default */
191#define VERBOSE 1 /* Verbose */
192#define DEBUG 2 /* print fancy stuff too */
193static int debug = QUIET;
194module_param(debug, int, 0);
Alan Cox261dcc72008-05-19 14:07:43 +0100195MODULE_PARM_DESC(debug,
196 "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100197
Alan Cox261dcc72008-05-19 14:07:43 +0100198/* default heartbeat = delay-time from dip-switches */
199#define WATCHDOG_HEARTBEAT 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200static int heartbeat = WATCHDOG_HEARTBEAT;
201module_param(heartbeat, int, 0);
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +0000202MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
203 "(2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default="
204 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Andrey Panin4bfdf372005-07-27 11:43:58 -0700206static int nowayout = WATCHDOG_NOWAYOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207module_param(nowayout, int, 0);
Alan Cox261dcc72008-05-19 14:07:43 +0100208MODULE_PARM_DESC(nowayout,
209 "Watchdog cannot be stopped once started (default="
210 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212/*
213 * Internal functions
214 */
215
216static int send_isa_command(int cmd)
217{
218 int i;
219 int control_status;
220 int port0, last_port0; /* Double read for stabilising */
221
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100222 if (debug >= DEBUG)
223 printk(KERN_DEBUG PFX "sending following data cmd=0x%02x\n",
224 cmd);
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 /* The WCMD bit must be 1 and the command is only 4 bits in size */
Wim Van Sebroeck8f0235d2006-01-09 21:56:09 +0100227 control_status = (cmd & 0x0F) | WD_WCMD;
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100228 outb_p(control_status, pcwd_private.io_addr + 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 udelay(ISA_COMMAND_TIMEOUT);
230
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100231 port0 = inb_p(pcwd_private.io_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 for (i = 0; i < 25; ++i) {
233 last_port0 = port0;
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100234 port0 = inb_p(pcwd_private.io_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
236 if (port0 == last_port0)
237 break; /* Data is stable */
238
Alan Cox261dcc72008-05-19 14:07:43 +0100239 udelay(250);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 }
241
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100242 if (debug >= DEBUG)
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +0000243 printk(KERN_DEBUG PFX "received following data for "
244 "cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n",
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100245 cmd, port0, last_port0);
246
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 return port0;
248}
249
250static int set_command_mode(void)
251{
Alan Cox261dcc72008-05-19 14:07:43 +0100252 int i, found = 0, count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
254 /* Set the card into command mode */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100255 spin_lock(&pcwd_private.io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 while ((!found) && (count < 3)) {
257 i = send_isa_command(CMD_ISA_IDLE);
258
259 if (i == 0x00)
260 found = 1;
261 else if (i == 0xF3) {
262 /* Card does not like what we've done to it */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100263 outb_p(0x00, pcwd_private.io_addr + 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 udelay(1200); /* Spec says wait 1ms */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100265 outb_p(0x00, pcwd_private.io_addr + 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 udelay(ISA_COMMAND_TIMEOUT);
267 }
268 count++;
269 }
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100270 spin_unlock(&pcwd_private.io_lock);
271 pcwd_private.command_mode = found;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100273 if (debug >= DEBUG)
274 printk(KERN_DEBUG PFX "command_mode=%d\n",
275 pcwd_private.command_mode);
276
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000277 return found;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278}
279
280static void unset_command_mode(void)
281{
282 /* Set the card into normal mode */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100283 spin_lock(&pcwd_private.io_lock);
284 outb_p(0x00, pcwd_private.io_addr + 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 udelay(ISA_COMMAND_TIMEOUT);
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100286 spin_unlock(&pcwd_private.io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100288 pcwd_private.command_mode = 0;
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100289
290 if (debug >= DEBUG)
291 printk(KERN_DEBUG PFX "command_mode=%d\n",
292 pcwd_private.command_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293}
294
Wim Van Sebroeck85875212006-01-09 21:59:39 +0100295static inline void pcwd_check_temperature_support(void)
296{
297 if (inb(pcwd_private.io_addr) != 0xF0)
298 pcwd_private.supports_temp = 1;
299}
300
Wim Van Sebroeck2891b6a2006-02-12 16:47:34 +0100301static inline void pcwd_get_firmware(void)
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100302{
303 int one, ten, hund, minor;
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100304
Wim Van Sebroeck6bbc20b2006-03-02 20:05:16 +0100305 strcpy(pcwd_private.fw_ver_str, "ERROR");
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100306
307 if (set_command_mode()) {
308 one = send_isa_command(CMD_ISA_VERSION_INTEGER);
309 ten = send_isa_command(CMD_ISA_VERSION_TENTH);
310 hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH);
311 minor = send_isa_command(CMD_ISA_VERSION_MINOR);
Alan Cox261dcc72008-05-19 14:07:43 +0100312 sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c",
313 one, ten, hund, minor);
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100314 }
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100315 unset_command_mode();
Wim Van Sebroeck2891b6a2006-02-12 16:47:34 +0100316
317 return;
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100318}
319
320static inline int pcwd_get_option_switches(void)
321{
Alan Cox261dcc72008-05-19 14:07:43 +0100322 int option_switches = 0;
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100323
324 if (set_command_mode()) {
325 /* Get switch settings */
326 option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS);
327 }
328
329 unset_command_mode();
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000330 return option_switches;
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100331}
332
333static void pcwd_show_card_info(void)
334{
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100335 int option_switches;
336
337 /* Get some extra info from the hardware (in command/debug/diag mode) */
338 if (pcwd_private.revision == PCWD_REVISION_A)
Alan Cox261dcc72008-05-19 14:07:43 +0100339 printk(KERN_INFO PFX
340 "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n",
341 pcwd_private.io_addr);
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100342 else if (pcwd_private.revision == PCWD_REVISION_C) {
Wim Van Sebroeck2891b6a2006-02-12 16:47:34 +0100343 pcwd_get_firmware();
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +0000344 printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port "
345 "0x%04x (Firmware version: %s)\n",
Wim Van Sebroeck2891b6a2006-02-12 16:47:34 +0100346 pcwd_private.io_addr, pcwd_private.fw_ver_str);
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100347 option_switches = pcwd_get_option_switches();
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +0000348 printk(KERN_INFO PFX "Option switches (0x%02x): "
349 "Temperature Reset Enable=%s, Power On Delay=%s\n",
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100350 option_switches,
351 ((option_switches & 0x10) ? "ON" : "OFF"),
352 ((option_switches & 0x08) ? "ON" : "OFF"));
353
354 /* Reprogram internal heartbeat to 2 seconds */
355 if (set_command_mode()) {
356 send_isa_command(CMD_ISA_DELAY_TIME_2SECS);
357 unset_command_mode();
358 }
359 }
360
361 if (pcwd_private.supports_temp)
362 printk(KERN_INFO PFX "Temperature Option Detected\n");
363
364 if (pcwd_private.boot_status & WDIOF_CARDRESET)
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +0000365 printk(KERN_INFO PFX
366 "Previous reboot was caused by the card\n");
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100367
368 if (pcwd_private.boot_status & WDIOF_OVERHEAT) {
Alan Cox261dcc72008-05-19 14:07:43 +0100369 printk(KERN_EMERG PFX
370 "Card senses a CPU Overheat. Panicking!\n");
371 printk(KERN_EMERG PFX
372 "CPU Overheat\n");
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100373 }
374
375 if (pcwd_private.boot_status == 0)
Alan Cox261dcc72008-05-19 14:07:43 +0100376 printk(KERN_INFO PFX
377 "No previous trip detected - Cold boot or reset\n");
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100378}
379
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380static void pcwd_timer_ping(unsigned long data)
381{
382 int wdrst_stat;
383
384 /* If we got a heartbeat pulse within the WDT_INTERVAL
385 * we agree to ping the WDT */
Alan Cox261dcc72008-05-19 14:07:43 +0100386 if (time_before(jiffies, pcwd_private.next_heartbeat)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 /* Ping the watchdog */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100388 spin_lock(&pcwd_private.io_lock);
389 if (pcwd_private.revision == PCWD_REVISION_A) {
Alan Cox261dcc72008-05-19 14:07:43 +0100390 /* Rev A cards are reset by setting the
391 WD_WDRST bit in register 1 */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100392 wdrst_stat = inb_p(pcwd_private.io_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 wdrst_stat &= 0x0F;
394 wdrst_stat |= WD_WDRST;
395
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100396 outb_p(wdrst_stat, pcwd_private.io_addr + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 } else {
398 /* Re-trigger watchdog by writing to port 0 */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100399 outb_p(0x00, pcwd_private.io_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401
402 /* Re-set the timer interval */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100403 mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100405 spin_unlock(&pcwd_private.io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 } else {
Alan Cox261dcc72008-05-19 14:07:43 +0100407 printk(KERN_WARNING PFX
408 "Heartbeat lost! Will not ping the watchdog\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 }
410}
411
412static int pcwd_start(void)
413{
414 int stat_reg;
415
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100416 pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418 /* Start the timer */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100419 mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
421 /* Enable the port */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100422 if (pcwd_private.revision == PCWD_REVISION_C) {
423 spin_lock(&pcwd_private.io_lock);
424 outb_p(0x00, pcwd_private.io_addr + 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 udelay(ISA_COMMAND_TIMEOUT);
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100426 stat_reg = inb_p(pcwd_private.io_addr + 2);
427 spin_unlock(&pcwd_private.io_lock);
Wim Van Sebroeck8f0235d2006-01-09 21:56:09 +0100428 if (stat_reg & WD_WDIS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 printk(KERN_INFO PFX "Could not start watchdog\n");
430 return -EIO;
431 }
432 }
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100433
434 if (debug >= VERBOSE)
435 printk(KERN_DEBUG PFX "Watchdog started\n");
436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 return 0;
438}
439
440static int pcwd_stop(void)
441{
442 int stat_reg;
443
444 /* Stop the timer */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100445 del_timer(&pcwd_private.timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
447 /* Disable the board */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100448 if (pcwd_private.revision == PCWD_REVISION_C) {
449 spin_lock(&pcwd_private.io_lock);
450 outb_p(0xA5, pcwd_private.io_addr + 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 udelay(ISA_COMMAND_TIMEOUT);
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100452 outb_p(0xA5, pcwd_private.io_addr + 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 udelay(ISA_COMMAND_TIMEOUT);
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100454 stat_reg = inb_p(pcwd_private.io_addr + 2);
455 spin_unlock(&pcwd_private.io_lock);
Wim Van Sebroeck8f0235d2006-01-09 21:56:09 +0100456 if ((stat_reg & WD_WDIS) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 printk(KERN_INFO PFX "Could not stop watchdog\n");
458 return -EIO;
459 }
460 }
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100461
462 if (debug >= VERBOSE)
463 printk(KERN_DEBUG PFX "Watchdog stopped\n");
464
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 return 0;
466}
467
468static int pcwd_keepalive(void)
469{
470 /* user land ping */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100471 pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100472
473 if (debug >= DEBUG)
474 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
475
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 return 0;
477}
478
479static int pcwd_set_heartbeat(int t)
480{
Alan Cox261dcc72008-05-19 14:07:43 +0100481 if (t < 2 || t > 7200) /* arbitrary upper limit */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 return -EINVAL;
483
484 heartbeat = t;
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100485
486 if (debug >= VERBOSE)
487 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
488 heartbeat);
489
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 return 0;
491}
492
493static int pcwd_get_status(int *status)
494{
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100495 int control_status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Alan Cox261dcc72008-05-19 14:07:43 +0100497 *status = 0;
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100498 spin_lock(&pcwd_private.io_lock);
499 if (pcwd_private.revision == PCWD_REVISION_A)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 /* Rev A cards return status information from
501 * the base register, which is used for the
502 * temperature in other cards. */
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100503 control_status = inb(pcwd_private.io_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 else {
505 /* Rev C cards return card status in the base
506 * address + 1 register. And use different bits
507 * to indicate a card initiated reset, and an
508 * over-temperature condition. And the reboot
509 * status can be reset. */
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100510 control_status = inb(pcwd_private.io_addr + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 }
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100512 spin_unlock(&pcwd_private.io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100514 if (pcwd_private.revision == PCWD_REVISION_A) {
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100515 if (control_status & WD_WDRST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 *status |= WDIOF_CARDRESET;
517
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100518 if (control_status & WD_T110) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 *status |= WDIOF_OVERHEAT;
520 if (temp_panic) {
Alan Cox261dcc72008-05-19 14:07:43 +0100521 printk(KERN_INFO PFX
522 "Temperature overheat trip!\n");
Eric W. Biederman68acc052005-07-26 12:03:08 -0600523 kernel_power_off();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 }
525 }
526 } else {
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100527 if (control_status & WD_REVC_WTRP)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 *status |= WDIOF_CARDRESET;
529
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100530 if (control_status & WD_REVC_TTRP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 *status |= WDIOF_OVERHEAT;
532 if (temp_panic) {
Alan Cox261dcc72008-05-19 14:07:43 +0100533 printk(KERN_INFO PFX
534 "Temperature overheat trip!\n");
Eric W. Biederman68acc052005-07-26 12:03:08 -0600535 kernel_power_off();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 }
537 }
538 }
539
540 return 0;
541}
542
543static int pcwd_clear_status(void)
544{
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100545 int control_status;
546
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100547 if (pcwd_private.revision == PCWD_REVISION_C) {
548 spin_lock(&pcwd_private.io_lock);
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100549
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100550 if (debug >= VERBOSE)
Alan Cox261dcc72008-05-19 14:07:43 +0100551 printk(KERN_INFO PFX
552 "clearing watchdog trip status\n");
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100553
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100554 control_status = inb_p(pcwd_private.io_addr + 1);
555
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100556 if (debug >= DEBUG) {
Alan Cox261dcc72008-05-19 14:07:43 +0100557 printk(KERN_DEBUG PFX "status was: 0x%02x\n",
558 control_status);
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100559 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
560 (control_status & WD_REVC_R2DS));
561 }
562
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100563 /* clear reset status & Keep Relay 2 disable state as it is */
Alan Cox261dcc72008-05-19 14:07:43 +0100564 outb_p((control_status & WD_REVC_R2DS),
565 pcwd_private.io_addr + 1);
Wim Van Sebroeck4206f0c2006-02-12 16:37:36 +0100566
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100567 spin_unlock(&pcwd_private.io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 }
569 return 0;
570}
571
572static int pcwd_get_temperature(int *temperature)
573{
574 /* check that port 0 gives temperature info and no command results */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100575 if (pcwd_private.command_mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 return -1;
577
578 *temperature = 0;
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100579 if (!pcwd_private.supports_temp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 return -ENODEV;
581
582 /*
583 * Convert celsius to fahrenheit, since this was
584 * the decided 'standard' for this return value.
585 */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100586 spin_lock(&pcwd_private.io_lock);
587 *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32;
588 spin_unlock(&pcwd_private.io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
Wim Van Sebroeckc324ab42006-02-12 17:12:55 +0100590 if (debug >= DEBUG) {
591 printk(KERN_DEBUG PFX "temperature is: %d F\n",
592 *temperature);
593 }
594
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 return 0;
596}
597
598/*
599 * /dev/watchdog handling
600 */
601
Alan Cox261dcc72008-05-19 14:07:43 +0100602static long pcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603{
604 int rv;
605 int status;
606 int temperature;
607 int new_heartbeat;
608 int __user *argp = (int __user *)arg;
609 static struct watchdog_info ident = {
610 .options = WDIOF_OVERHEAT |
611 WDIOF_CARDRESET |
612 WDIOF_KEEPALIVEPING |
613 WDIOF_SETTIMEOUT |
614 WDIOF_MAGICCLOSE,
615 .firmware_version = 1,
616 .identity = "PCWD",
617 };
618
Alan Cox261dcc72008-05-19 14:07:43 +0100619 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 case WDIOC_GETSUPPORT:
Alan Cox261dcc72008-05-19 14:07:43 +0100621 if (copy_to_user(argp, &ident, sizeof(ident)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 return -EFAULT;
623 return 0;
624
625 case WDIOC_GETSTATUS:
626 pcwd_get_status(&status);
627 return put_user(status, argp);
628
629 case WDIOC_GETBOOTSTATUS:
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100630 return put_user(pcwd_private.boot_status, argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
632 case WDIOC_GETTEMP:
633 if (pcwd_get_temperature(&temperature))
634 return -EFAULT;
635
636 return put_user(temperature, argp);
637
638 case WDIOC_SETOPTIONS:
Alan Cox261dcc72008-05-19 14:07:43 +0100639 if (pcwd_private.revision == PCWD_REVISION_C) {
640 if (get_user(rv, argp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 return -EFAULT;
642
Alan Cox261dcc72008-05-19 14:07:43 +0100643 if (rv & WDIOS_DISABLECARD) {
644 status = pcwd_stop();
645 if (status < 0)
646 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 }
Alan Cox261dcc72008-05-19 14:07:43 +0100648 if (rv & WDIOS_ENABLECARD) {
649 status = pcwd_start();
650 if (status < 0)
651 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 if (rv & WDIOS_TEMPPANIC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 temp_panic = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 }
656 return -EINVAL;
657
658 case WDIOC_KEEPALIVE:
659 pcwd_keepalive();
660 return 0;
661
662 case WDIOC_SETTIMEOUT:
663 if (get_user(new_heartbeat, argp))
664 return -EFAULT;
665
666 if (pcwd_set_heartbeat(new_heartbeat))
667 return -EINVAL;
668
669 pcwd_keepalive();
670 /* Fall */
671
672 case WDIOC_GETTIMEOUT:
673 return put_user(heartbeat, argp);
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000674
675 default:
676 return -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 }
678
679 return 0;
680}
681
682static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len,
683 loff_t *ppos)
684{
685 if (len) {
686 if (!nowayout) {
687 size_t i;
688
689 /* In case it was set long ago */
690 expect_close = 0;
691
692 for (i = 0; i != len; i++) {
693 char c;
694
695 if (get_user(c, buf + i))
696 return -EFAULT;
697 if (c == 'V')
698 expect_close = 42;
699 }
700 }
701 pcwd_keepalive();
702 }
703 return len;
704}
705
706static int pcwd_open(struct inode *inode, struct file *file)
707{
Alan Cox261dcc72008-05-19 14:07:43 +0100708 if (test_and_set_bit(0, &open_allowed))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 return -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 if (nowayout)
711 __module_get(THIS_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 /* Activate */
713 pcwd_start();
714 pcwd_keepalive();
715 return nonseekable_open(inode, file);
716}
717
718static int pcwd_close(struct inode *inode, struct file *file)
719{
Alan Cox261dcc72008-05-19 14:07:43 +0100720 if (expect_close == 42)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 pcwd_stop();
Alan Cox261dcc72008-05-19 14:07:43 +0100722 else {
723 printk(KERN_CRIT PFX
724 "Unexpected close, not stopping watchdog!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 pcwd_keepalive();
726 }
727 expect_close = 0;
Alan Cox261dcc72008-05-19 14:07:43 +0100728 clear_bit(0, &open_allowed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 return 0;
730}
731
732/*
733 * /dev/temperature handling
734 */
735
736static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count,
737 loff_t *ppos)
738{
739 int temperature;
740
741 if (pcwd_get_temperature(&temperature))
742 return -EFAULT;
743
744 if (copy_to_user(buf, &temperature, 1))
745 return -EFAULT;
746
747 return 1;
748}
749
750static int pcwd_temp_open(struct inode *inode, struct file *file)
751{
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100752 if (!pcwd_private.supports_temp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 return -ENODEV;
754
755 return nonseekable_open(inode, file);
756}
757
758static int pcwd_temp_close(struct inode *inode, struct file *file)
759{
760 return 0;
761}
762
763/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 * Kernel Interfaces
765 */
766
Arjan van de Ven62322d22006-07-03 00:24:21 -0700767static const struct file_operations pcwd_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 .owner = THIS_MODULE,
769 .llseek = no_llseek,
770 .write = pcwd_write,
Alan Cox261dcc72008-05-19 14:07:43 +0100771 .unlocked_ioctl = pcwd_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 .open = pcwd_open,
773 .release = pcwd_close,
774};
775
776static struct miscdevice pcwd_miscdev = {
777 .minor = WATCHDOG_MINOR,
778 .name = "watchdog",
779 .fops = &pcwd_fops,
780};
781
Arjan van de Ven62322d22006-07-03 00:24:21 -0700782static const struct file_operations pcwd_temp_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 .owner = THIS_MODULE,
784 .llseek = no_llseek,
785 .read = pcwd_temp_read,
786 .open = pcwd_temp_open,
787 .release = pcwd_temp_close,
788};
789
790static struct miscdevice temp_miscdev = {
791 .minor = TEMP_MINOR,
792 .name = "temperature",
793 .fops = &pcwd_temp_fops,
794};
795
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796/*
797 * Init & exit routines
798 */
799
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800static inline int get_revision(void)
801{
802 int r = PCWD_REVISION_C;
803
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100804 spin_lock(&pcwd_private.io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 /* REV A cards use only 2 io ports; test
806 * presumes a floating bus reads as 0xff. */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100807 if ((inb(pcwd_private.io_addr + 2) == 0xFF) ||
808 (inb(pcwd_private.io_addr + 3) == 0xFF))
Alan Cox261dcc72008-05-19 14:07:43 +0100809 r = PCWD_REVISION_A;
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100810 spin_unlock(&pcwd_private.io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
812 return r;
813}
814
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000815/*
816 * The ISA cards have a heartbeat bit in one of the registers, which
817 * register is card dependent. The heartbeat bit is monitored, and if
818 * found, is considered proof that a Berkshire card has been found.
819 * The initial rate is once per second at board start up, then twice
820 * per second for normal operation.
821 */
822static int __devinit pcwd_isa_match(struct device *dev, unsigned int id)
823{
Alan Cox261dcc72008-05-19 14:07:43 +0100824 int base_addr = pcwd_ioports[id];
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000825 int port0, last_port0; /* Reg 0, in case it's REV A */
826 int port1, last_port1; /* Register 1 for REV C cards */
827 int i;
828 int retval;
829
830 if (debug >= DEBUG)
831 printk(KERN_DEBUG PFX "pcwd_isa_match id=%d\n",
832 id);
833
Alan Cox261dcc72008-05-19 14:07:43 +0100834 if (!request_region(base_addr, 4, "PCWD")) {
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000835 printk(KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr);
836 return 0;
837 }
838
839 retval = 0;
840
841 port0 = inb_p(base_addr); /* For REV A boards */
842 port1 = inb_p(base_addr + 1); /* For REV C boards */
843 if (port0 != 0xff || port1 != 0xff) {
844 /* Not an 'ff' from a floating bus, so must be a card! */
845 for (i = 0; i < 4; ++i) {
846
847 msleep(500);
848
849 last_port0 = port0;
850 last_port1 = port1;
851
852 port0 = inb_p(base_addr);
853 port1 = inb_p(base_addr + 1);
854
855 /* Has either hearbeat bit changed? */
856 if ((port0 ^ last_port0) & WD_HRTBT ||
857 (port1 ^ last_port1) & WD_REVC_HRBT) {
858 retval = 1;
859 break;
860 }
861 }
862 }
Alan Cox261dcc72008-05-19 14:07:43 +0100863 release_region(base_addr, 4);
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000864
865 return retval;
866}
867
868static int __devinit pcwd_isa_probe(struct device *dev, unsigned int id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869{
870 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000872 if (debug >= DEBUG)
873 printk(KERN_DEBUG PFX "pcwd_isa_probe id=%d\n",
874 id);
875
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 cards_found++;
877 if (cards_found == 1)
Alan Cox261dcc72008-05-19 14:07:43 +0100878 printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n",
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +0000879 WATCHDOG_VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
881 if (cards_found > 1) {
882 printk(KERN_ERR PFX "This driver only supports 1 device\n");
883 return -ENODEV;
884 }
885
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000886 if (pcwd_ioports[id] == 0x0000) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
888 return -ENODEV;
889 }
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000890 pcwd_private.io_addr = pcwd_ioports[id];
891
892 spin_lock_init(&pcwd_private.io_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
894 /* Check card's revision */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100895 pcwd_private.revision = get_revision();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896
Alan Cox261dcc72008-05-19 14:07:43 +0100897 if (!request_region(pcwd_private.io_addr,
898 (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100900 pcwd_private.io_addr);
Alan Cox261dcc72008-05-19 14:07:43 +0100901 ret = -EIO;
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000902 goto error_request_region;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 }
904
905 /* Initial variables */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100906 pcwd_private.supports_temp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 temp_panic = 0;
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100908 pcwd_private.boot_status = 0x0000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909
910 /* get the boot_status */
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100911 pcwd_get_status(&pcwd_private.boot_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912
913 /* clear the "card caused reboot" flag */
914 pcwd_clear_status();
915
Jiri Slaby82eb7c52007-02-08 18:39:36 +0100916 setup_timer(&pcwd_private.timer, pcwd_timer_ping, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
918 /* Disable the board */
919 pcwd_stop();
920
921 /* Check whether or not the card supports the temperature device */
Wim Van Sebroeck85875212006-01-09 21:59:39 +0100922 pcwd_check_temperature_support();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
Wim Van Sebroeckaf3b38d2006-01-09 22:03:41 +0100924 /* Show info about the card itself */
925 pcwd_show_card_info();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926
Wim Van Sebroeckf3dc0732007-01-09 22:43:49 +0100927 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
928 if (heartbeat == 0)
929 heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)];
930
Alan Cox261dcc72008-05-19 14:07:43 +0100931 /* Check that the heartbeat value is within it's range;
932 if not reset to the default */
Wim Van Sebroeckfd41fa62005-12-10 14:22:37 +0100933 if (pcwd_set_heartbeat(heartbeat)) {
934 pcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
Alan Cox261dcc72008-05-19 14:07:43 +0100935 printk(KERN_INFO PFX
936 "heartbeat value must be 2 <= heartbeat <= 7200, using %d\n",
937 WATCHDOG_HEARTBEAT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 }
939
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100940 if (pcwd_private.supports_temp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 ret = misc_register(&temp_miscdev);
942 if (ret) {
Alan Cox261dcc72008-05-19 14:07:43 +0100943 printk(KERN_ERR PFX
944 "cannot register miscdev on minor=%d (err=%d)\n",
945 TEMP_MINOR, ret);
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000946 goto error_misc_register_temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 }
948 }
949
950 ret = misc_register(&pcwd_miscdev);
951 if (ret) {
Alan Cox261dcc72008-05-19 14:07:43 +0100952 printk(KERN_ERR PFX
953 "cannot register miscdev on minor=%d (err=%d)\n",
954 WATCHDOG_MINOR, ret);
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000955 goto error_misc_register_watchdog;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 }
957
958 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
959 heartbeat, nowayout);
960
961 return 0;
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000962
963error_misc_register_watchdog:
964 if (pcwd_private.supports_temp)
965 misc_deregister(&temp_miscdev);
966error_misc_register_temp:
Alan Cox261dcc72008-05-19 14:07:43 +0100967 release_region(pcwd_private.io_addr,
968 (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000969error_request_region:
970 pcwd_private.io_addr = 0x0000;
971 cards_found--;
972 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973}
974
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000975static int __devexit pcwd_isa_remove(struct device *dev, unsigned int id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976{
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +0000977 if (debug >= DEBUG)
978 printk(KERN_DEBUG PFX "pcwd_isa_remove id=%d\n",
979 id);
980
981 if (!pcwd_private.io_addr)
982 return 1;
983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 /* Disable the board */
985 if (!nowayout)
986 pcwd_stop();
987
988 /* Deregister */
989 misc_deregister(&pcwd_miscdev);
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100990 if (pcwd_private.supports_temp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 misc_deregister(&temp_miscdev);
Alan Cox261dcc72008-05-19 14:07:43 +0100992 release_region(pcwd_private.io_addr,
993 (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
Wim Van Sebroecka2be8782006-01-09 21:53:33 +0100994 pcwd_private.io_addr = 0x0000;
Wim Van Sebroeckf1c3a052005-12-10 14:36:24 +0100995 cards_found--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996
997 return 0;
998}
999
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +00001000static void pcwd_isa_shutdown(struct device *dev, unsigned int id)
1001{
1002 if (debug >= DEBUG)
1003 printk(KERN_DEBUG PFX "pcwd_isa_shutdown id=%d\n",
1004 id);
1005
1006 pcwd_stop();
1007}
1008
1009static struct isa_driver pcwd_isa_driver = {
1010 .match = pcwd_isa_match,
1011 .probe = pcwd_isa_probe,
1012 .remove = __devexit_p(pcwd_isa_remove),
1013 .shutdown = pcwd_isa_shutdown,
1014 .driver = {
1015 .owner = THIS_MODULE,
1016 .name = WATCHDOG_NAME,
1017 },
1018};
1019
1020static int __init pcwd_init_module(void)
1021{
1022 return isa_register_driver(&pcwd_isa_driver, PCWD_ISA_NR_CARDS);
1023}
1024
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025static void __exit pcwd_cleanup_module(void)
1026{
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +00001027 isa_unregister_driver(&pcwd_isa_driver);
Wim Van Sebroeck369fa252006-02-12 17:44:57 +01001028 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029}
1030
1031module_init(pcwd_init_module);
1032module_exit(pcwd_cleanup_module);
1033
Wim Van Sebroeck143a2e52009-03-18 08:35:09 +00001034MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>, "
1035 "Wim Van Sebroeck <wim@iguana.be>");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver");
Wim Van Sebroeck5aa15052007-05-05 05:48:23 +00001037MODULE_VERSION(WATCHDOG_VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038MODULE_LICENSE("GPL");
1039MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
1040MODULE_ALIAS_MISCDEV(TEMP_MINOR);