2 * intel TCO vendor specific watchdog driver support
4 * (c) Copyright 2006-2009 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.
17 * Includes, defines, variables, module parameters, ...
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22 /* Module and version information */
23 #define DRV_NAME "iTCO_vendor_support"
24 #define DRV_VERSION "1.04"
27 #include <linux/module.h> /* For module specific items */
28 #include <linux/moduleparam.h> /* For new moduleparam's */
29 #include <linux/types.h> /* For standard types (like size_t) */
30 #include <linux/errno.h> /* For the -ENODEV/... values */
31 #include <linux/kernel.h> /* For printk/panic/... */
32 #include <linux/init.h> /* For __init/__exit/... */
33 #include <linux/ioport.h> /* For io-port access */
34 #include <linux/io.h> /* For inb/outb/... */
36 #include "iTCO_vendor.h"
38 /* List of vendor support modes */
39 /* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */
40 #define SUPERMICRO_OLD_BOARD 1
41 /* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems */
42 #define SUPERMICRO_NEW_BOARD 2
44 #define BROKEN_BIOS 911
46 static int vendorsupport
;
47 module_param(vendorsupport
, int, 0);
48 MODULE_PARM_DESC(vendorsupport
, "iTCO vendor specific support mode, default="
49 "0 (none), 1=SuperMicro Pent3, 2=SuperMicro Pent4+, "
50 "911=Broken SMI BIOS");
53 * Vendor Specific Support
58 * Board: Super Micro Computer Inc. 370SSE+-OEM1/P3TSSE
61 * Code contributed by: R. Seretny <lkpatches@paypc.com>
62 * Documentation obtained by R. Seretny from SuperMicro Technical Support
64 * To enable Watchdog function:
65 * BIOS setup -> Power -> TCO Logic SMI Enable -> Within5Minutes
66 * This setting enables SMI to clear the watchdog expired flag.
67 * If BIOS or CPU fail which may cause SMI hang, then system will
68 * reboot. When application starts to use watchdog function,
69 * application has to take over the control from SMI.
71 * For P3TSSE, J36 jumper needs to be removed to enable the Watchdog
74 * Note: The system will reboot when Expire Flag is set TWICE.
75 * So, if the watchdog timer is 20 seconds, then the maximum hang
76 * time is about 40 seconds, and the minimum hang time is about
80 static void supermicro_old_pre_start(struct resource
*smires
)
84 /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
85 val32
= inl(smires
->start
);
86 val32
&= 0xffffdfff; /* Turn off SMI clearing watchdog */
87 outl(val32
, smires
->start
); /* Needed to activate watchdog */
90 static void supermicro_old_pre_stop(struct resource
*smires
)
94 /* Bit 13: TCO_EN -> 1 = Enables the TCO logic to generate SMI# */
95 val32
= inl(smires
->start
);
96 val32
|= 0x00002000; /* Turn on SMI clearing watchdog */
97 outl(val32
, smires
->start
); /* Needed to deactivate watchdog */
102 * Board: Super Micro Computer Inc. P4SBx, P4DPx
105 * Code contributed by: R. Seretny <lkpatches@paypc.com>
106 * Documentation obtained by R. Seretny from SuperMicro Technical Support
108 * To enable Watchdog function:
111 * BIOS setup -> Advanced -> Integrated Peripherals -> Watch Dog Feature
113 * BIOS setup -> Advanced -> I/O Device Configuration -> Watch Dog
114 * This setting enables or disables Watchdog function. When enabled, the
115 * default watchdog timer is set to be 5 minutes (about 4m35s). It is
116 * enough to load and run the OS. The application (service or driver) has
117 * to take over the control once OS is running up and before watchdog
123 * This jumper is used for safety. Closed is enabled. This jumper
124 * prevents user enables watchdog in BIOS by accident.
126 * To enable Watch Dog function, both BIOS and JUMPER must be enabled.
128 * The documentation lists motherboards P4SBx and P4DPx series as of
129 * 20-March-2002. However, this code works flawlessly with much newer
130 * motherboards, such as my X6DHR-8G2 (SuperServer 6014H-82).
132 * The original iTCO driver as written does not actually reset the
133 * watchdog timer on these machines, as a result they reboot after five
136 * NOTE: You may leave the Watchdog function disabled in the SuperMicro
137 * BIOS to avoid a "boot-race"... This driver will enable watchdog
138 * functionality even if it's disabled in the BIOS once the /dev/watchdog
143 #define SM_REGINDEX 0x2e /* SuperMicro ICH4+ Register Index */
144 #define SM_DATAIO 0x2f /* SuperMicro ICH4+ Register Data I/O */
146 /* Control Register's */
147 #define SM_CTLPAGESW 0x07 /* SuperMicro ICH4+ Control Page Switch */
148 #define SM_CTLPAGE 0x08 /* SuperMicro ICH4+ Control Page Num */
150 #define SM_WATCHENABLE 0x30 /* Watchdog enable: Bit 0: 0=off, 1=on */
152 #define SM_WATCHPAGE 0x87 /* Watchdog unlock control page */
154 #define SM_ENDWATCH 0xAA /* Watchdog lock control page */
156 #define SM_COUNTMODE 0xf5 /* Watchdog count mode select */
157 /* (Bit 3: 0 = seconds, 1 = minutes */
159 #define SM_WATCHTIMER 0xf6 /* 8-bits, Watchdog timer counter (RW) */
161 #define SM_RESETCONTROL 0xf7 /* Watchdog reset control */
162 /* Bit 6: timer is reset by kbd interrupt */
163 /* Bit 7: timer is reset by mouse interrupt */
165 static void supermicro_new_unlock_watchdog(void)
167 /* Write 0x87 to port 0x2e twice */
168 outb(SM_WATCHPAGE
, SM_REGINDEX
);
169 outb(SM_WATCHPAGE
, SM_REGINDEX
);
170 /* Switch to watchdog control page */
171 outb(SM_CTLPAGESW
, SM_REGINDEX
);
172 outb(SM_CTLPAGE
, SM_DATAIO
);
175 static void supermicro_new_lock_watchdog(void)
177 outb(SM_ENDWATCH
, SM_REGINDEX
);
180 static void supermicro_new_pre_start(unsigned int heartbeat
)
184 supermicro_new_unlock_watchdog();
186 /* Watchdog timer setting needs to be in seconds*/
187 outb(SM_COUNTMODE
, SM_REGINDEX
);
188 val
= inb(SM_DATAIO
);
190 outb(val
, SM_DATAIO
);
192 /* Write heartbeat interval to WDOG */
193 outb(SM_WATCHTIMER
, SM_REGINDEX
);
194 outb((heartbeat
& 255), SM_DATAIO
);
196 /* Make sure keyboard/mouse interrupts don't interfere */
197 outb(SM_RESETCONTROL
, SM_REGINDEX
);
198 val
= inb(SM_DATAIO
);
200 outb(val
, SM_DATAIO
);
202 /* enable watchdog by setting bit 0 of Watchdog Enable to 1 */
203 outb(SM_WATCHENABLE
, SM_REGINDEX
);
204 val
= inb(SM_DATAIO
);
206 outb(val
, SM_DATAIO
);
208 supermicro_new_lock_watchdog();
211 static void supermicro_new_pre_stop(void)
215 supermicro_new_unlock_watchdog();
217 /* disable watchdog by setting bit 0 of Watchdog Enable to 0 */
218 outb(SM_WATCHENABLE
, SM_REGINDEX
);
219 val
= inb(SM_DATAIO
);
221 outb(val
, SM_DATAIO
);
223 supermicro_new_lock_watchdog();
226 static void supermicro_new_pre_set_heartbeat(unsigned int heartbeat
)
228 supermicro_new_unlock_watchdog();
230 /* reset watchdog timeout to heartveat value */
231 outb(SM_WATCHTIMER
, SM_REGINDEX
);
232 outb((heartbeat
& 255), SM_DATAIO
);
234 supermicro_new_lock_watchdog();
238 * Vendor Support: 911
239 * Board: Some Intel ICHx based motherboards
240 * iTCO chipset: ICH7+
242 * Some Intel motherboards have a broken BIOS implementation: i.e.
243 * the SMI handler clear's the TIMEOUT bit in the TC01_STS register
244 * and does not reload the time. Thus the TCO watchdog does not reboot
247 * These are the conclusions of Andriy Gapon <avg@icyb.net.ua> after
248 * debugging: the SMI handler is quite simple - it tests value in
249 * TCO1_CNT against 0x800, i.e. checks TCO_TMR_HLT. If the bit is set
250 * the handler goes into an infinite loop, apparently to allow the
251 * second timeout and reboot. Otherwise it simply clears TIMEOUT bit
252 * in TCO1_STS and that's it.
253 * So the logic seems to be reversed, because it is hard to see how
254 * TIMEOUT can get set to 1 and SMI generated when TCO_TMR_HLT is set
255 * (other than a transitional effect).
257 * The only fix found to get the motherboard(s) to reboot is to put
258 * the glb_smi_en bit to 0. This is a dirty hack that bypasses the
259 * broken code by disabling Global SMI.
261 * WARNING: globally disabling SMI could possibly lead to dramatic
262 * problems, especially on laptops! I.e. various ACPI things where
263 * SMI is used for communication between OS and firmware.
265 * Don't use this fix if you don't need to!!!
268 static void broken_bios_start(struct resource
*smires
)
272 val32
= inl(smires
->start
);
273 /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI#
274 Bit 0: GBL_SMI_EN -> 0 = No SMI# will be generated by ICH. */
276 outl(val32
, smires
->start
);
279 static void broken_bios_stop(struct resource
*smires
)
283 val32
= inl(smires
->start
);
284 /* Bit 13: TCO_EN -> 1 = Enables TCO logic generating an SMI#
285 Bit 0: GBL_SMI_EN -> 1 = Turn global SMI on again. */
287 outl(val32
, smires
->start
);
291 * Generic Support Functions
294 void iTCO_vendor_pre_start(struct resource
*smires
,
295 unsigned int heartbeat
)
297 switch (vendorsupport
) {
298 case SUPERMICRO_OLD_BOARD
:
299 supermicro_old_pre_start(smires
);
301 case SUPERMICRO_NEW_BOARD
:
302 supermicro_new_pre_start(heartbeat
);
305 broken_bios_start(smires
);
309 EXPORT_SYMBOL(iTCO_vendor_pre_start
);
311 void iTCO_vendor_pre_stop(struct resource
*smires
)
313 switch (vendorsupport
) {
314 case SUPERMICRO_OLD_BOARD
:
315 supermicro_old_pre_stop(smires
);
317 case SUPERMICRO_NEW_BOARD
:
318 supermicro_new_pre_stop();
321 broken_bios_stop(smires
);
325 EXPORT_SYMBOL(iTCO_vendor_pre_stop
);
327 void iTCO_vendor_pre_keepalive(struct resource
*smires
, unsigned int heartbeat
)
329 if (vendorsupport
== SUPERMICRO_NEW_BOARD
)
330 supermicro_new_pre_set_heartbeat(heartbeat
);
332 EXPORT_SYMBOL(iTCO_vendor_pre_keepalive
);
334 void iTCO_vendor_pre_set_heartbeat(unsigned int heartbeat
)
336 if (vendorsupport
== SUPERMICRO_NEW_BOARD
)
337 supermicro_new_pre_set_heartbeat(heartbeat
);
339 EXPORT_SYMBOL(iTCO_vendor_pre_set_heartbeat
);
341 int iTCO_vendor_check_noreboot_on(void)
343 switch (vendorsupport
) {
344 case SUPERMICRO_OLD_BOARD
:
350 EXPORT_SYMBOL(iTCO_vendor_check_noreboot_on
);
352 static int __init
iTCO_vendor_init_module(void)
354 pr_info("vendor-support=%d\n", vendorsupport
);
358 static void __exit
iTCO_vendor_exit_module(void)
360 pr_info("Module Unloaded\n");
363 module_init(iTCO_vendor_init_module
);
364 module_exit(iTCO_vendor_exit_module
);
366 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>, "
367 "R. Seretny <lkpatches@paypc.com>");
368 MODULE_DESCRIPTION("Intel TCO Vendor Specific WatchDog Timer Driver Support");
369 MODULE_VERSION(DRV_VERSION
);
370 MODULE_LICENSE("GPL");