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 /* Module and version information */
21 #define DRV_NAME "iTCO_vendor_support"
22 #define DRV_VERSION "1.03"
23 #define PFX DRV_NAME ": "
26 #include <linux/module.h> /* For module specific items */
27 #include <linux/moduleparam.h> /* For new moduleparam's */
28 #include <linux/types.h> /* For standard types (like size_t) */
29 #include <linux/errno.h> /* For the -ENODEV/... values */
30 #include <linux/kernel.h> /* For printk/panic/... */
31 #include <linux/init.h> /* For __init/__exit/... */
32 #include <linux/ioport.h> /* For io-port access */
33 #include <linux/io.h> /* For inb/outb/... */
35 #include "iTCO_vendor.h"
38 #define SMI_EN acpibase + 0x30 /* SMI Control and Enable Register */
39 #define TCOBASE acpibase + 0x60 /* TCO base address */
40 #define TCO1_STS TCOBASE + 0x04 /* TCO1 Status Register */
42 /* List of vendor support modes */
43 /* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */
44 #define SUPERMICRO_OLD_BOARD 1
45 /* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems */
46 #define SUPERMICRO_NEW_BOARD 2
48 static int vendorsupport;
49 module_param(vendorsupport, int, 0);
50 MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=0 (none), 1=SuperMicro Pent3, 2=SuperMicro Pent4+");
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(unsigned long acpibase)
84 /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
86 val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
87 outl(val32, SMI_EN); /* Needed to activate watchdog */
90 static void supermicro_old_pre_stop(unsigned long acpibase)
94 /* Bit 13: TCO_EN -> 1 = Enables the TCO logic to generate SMI# */
96 val32 |= 0x00002000; /* Turn on SMI clearing watchdog */
97 outl(val32, SMI_EN); /* Needed to deactivate watchdog */
100 static void supermicro_old_pre_keepalive(unsigned long acpibase)
102 /* Reload TCO Timer (done in iTCO_wdt_keepalive) + */
103 /* Clear "Expire Flag" (Bit 3 of TC01_STS register) */
104 outb(0x08, TCO1_STS);
109 * Board: Super Micro Computer Inc. P4SBx, P4DPx
112 * Code contributed by: R. Seretny <lkpatches@paypc.com>
113 * Documentation obtained by R. Seretny from SuperMicro Technical Support
115 * To enable Watchdog function:
118 * BIOS setup -> Advanced -> Integrated Peripherals -> Watch Dog Feature
120 * BIOS setup -> Advanced -> I/O Device Configuration -> Watch Dog
121 * This setting enables or disables Watchdog function. When enabled, the
122 * default watchdog timer is set to be 5 minutes (about 4m35s). It is
123 * enough to load and run the OS. The application (service or driver) has
124 * to take over the control once OS is running up and before watchdog
130 * This jumper is used for safety. Closed is enabled. This jumper
131 * prevents user enables watchdog in BIOS by accident.
133 * To enable Watch Dog function, both BIOS and JUMPER must be enabled.
135 * The documentation lists motherboards P4SBx and P4DPx series as of
136 * 20-March-2002. However, this code works flawlessly with much newer
137 * motherboards, such as my X6DHR-8G2 (SuperServer 6014H-82).
139 * The original iTCO driver as written does not actually reset the
140 * watchdog timer on these machines, as a result they reboot after five
143 * NOTE: You may leave the Watchdog function disabled in the SuperMicro
144 * BIOS to avoid a "boot-race"... This driver will enable watchdog
145 * functionality even if it's disabled in the BIOS once the /dev/watchdog
150 #define SM_REGINDEX 0x2e /* SuperMicro ICH4+ Register Index */
151 #define SM_DATAIO 0x2f /* SuperMicro ICH4+ Register Data I/O */
153 /* Control Register's */
154 #define SM_CTLPAGESW 0x07 /* SuperMicro ICH4+ Control Page Switch */
155 #define SM_CTLPAGE 0x08 /* SuperMicro ICH4+ Control Page Num */
157 #define SM_WATCHENABLE 0x30 /* Watchdog enable: Bit 0: 0=off, 1=on */
159 #define SM_WATCHPAGE 0x87 /* Watchdog unlock control page */
161 #define SM_ENDWATCH 0xAA /* Watchdog lock control page */
163 #define SM_COUNTMODE 0xf5 /* Watchdog count mode select */
164 /* (Bit 3: 0 = seconds, 1 = minutes */
166 #define SM_WATCHTIMER 0xf6 /* 8-bits, Watchdog timer counter (RW) */
168 #define SM_RESETCONTROL 0xf7 /* Watchdog reset control */
169 /* Bit 6: timer is reset by kbd interrupt */
170 /* Bit 7: timer is reset by mouse interrupt */
172 static void supermicro_new_unlock_watchdog(void)
174 /* Write 0x87 to port 0x2e twice */
175 outb(SM_WATCHPAGE, SM_REGINDEX);
176 outb(SM_WATCHPAGE, SM_REGINDEX);
177 /* Switch to watchdog control page */
178 outb(SM_CTLPAGESW, SM_REGINDEX);
179 outb(SM_CTLPAGE, SM_DATAIO);
182 static void supermicro_new_lock_watchdog(void)
184 outb(SM_ENDWATCH, SM_REGINDEX);
187 static void supermicro_new_pre_start(unsigned int heartbeat)
191 supermicro_new_unlock_watchdog();
193 /* Watchdog timer setting needs to be in seconds*/
194 outb(SM_COUNTMODE, SM_REGINDEX);
195 val = inb(SM_DATAIO);
197 outb(val, SM_DATAIO);
199 /* Write heartbeat interval to WDOG */
200 outb(SM_WATCHTIMER, SM_REGINDEX);
201 outb((heartbeat & 255), SM_DATAIO);
203 /* Make sure keyboard/mouse interrupts don't interfere */
204 outb(SM_RESETCONTROL, SM_REGINDEX);
205 val = inb(SM_DATAIO);
207 outb(val, SM_DATAIO);
209 /* enable watchdog by setting bit 0 of Watchdog Enable to 1 */
210 outb(SM_WATCHENABLE, SM_REGINDEX);
211 val = inb(SM_DATAIO);
213 outb(val, SM_DATAIO);
215 supermicro_new_lock_watchdog();
218 static void supermicro_new_pre_stop(void)
222 supermicro_new_unlock_watchdog();
224 /* disable watchdog by setting bit 0 of Watchdog Enable to 0 */
225 outb(SM_WATCHENABLE, SM_REGINDEX);
226 val = inb(SM_DATAIO);
228 outb(val, SM_DATAIO);
230 supermicro_new_lock_watchdog();
233 static void supermicro_new_pre_set_heartbeat(unsigned int heartbeat)
235 supermicro_new_unlock_watchdog();
237 /* reset watchdog timeout to heartveat value */
238 outb(SM_WATCHTIMER, SM_REGINDEX);
239 outb((heartbeat & 255), SM_DATAIO);
241 supermicro_new_lock_watchdog();
245 * Generic Support Functions
248 void iTCO_vendor_pre_start(unsigned long acpibase,
249 unsigned int heartbeat)
251 if (vendorsupport == SUPERMICRO_OLD_BOARD)
252 supermicro_old_pre_start(acpibase);
253 else if (vendorsupport == SUPERMICRO_NEW_BOARD)
254 supermicro_new_pre_start(heartbeat);
256 EXPORT_SYMBOL(iTCO_vendor_pre_start);
258 void iTCO_vendor_pre_stop(unsigned long acpibase)
260 if (vendorsupport == SUPERMICRO_OLD_BOARD)
261 supermicro_old_pre_stop(acpibase);
262 else if (vendorsupport == SUPERMICRO_NEW_BOARD)
263 supermicro_new_pre_stop();
265 EXPORT_SYMBOL(iTCO_vendor_pre_stop);
267 void iTCO_vendor_pre_keepalive(unsigned long acpibase, unsigned int heartbeat)
269 if (vendorsupport == SUPERMICRO_OLD_BOARD)
270 supermicro_old_pre_keepalive(acpibase);
271 else if (vendorsupport == SUPERMICRO_NEW_BOARD)
272 supermicro_new_pre_set_heartbeat(heartbeat);
274 EXPORT_SYMBOL(iTCO_vendor_pre_keepalive);
276 void iTCO_vendor_pre_set_heartbeat(unsigned int heartbeat)
278 if (vendorsupport == SUPERMICRO_NEW_BOARD)
279 supermicro_new_pre_set_heartbeat(heartbeat);
281 EXPORT_SYMBOL(iTCO_vendor_pre_set_heartbeat);
283 int iTCO_vendor_check_noreboot_on(void)
285 switch (vendorsupport) {
286 case SUPERMICRO_OLD_BOARD:
292 EXPORT_SYMBOL(iTCO_vendor_check_noreboot_on);
294 static int __init iTCO_vendor_init_module(void)
296 printk(KERN_INFO PFX "vendor-support=%d\n", vendorsupport);
300 static void __exit iTCO_vendor_exit_module(void)
302 printk(KERN_INFO PFX "Module Unloaded\n");
305 module_init(iTCO_vendor_init_module);
306 module_exit(iTCO_vendor_exit_module);
308 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>, R. Seretny <lkpatches@paypc.com>");
309 MODULE_DESCRIPTION("Intel TCO Vendor Specific WatchDog Timer Driver Support");
310 MODULE_VERSION(DRV_VERSION);
311 MODULE_LICENSE("GPL");