289 lines
8.5 KiB
C
289 lines
8.5 KiB
C
/*
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* intel TCO vendor specific watchdog driver support
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*
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* (c) Copyright 2006-2008 Wim Van Sebroeck <wim@iguana.be>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
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* provide warranty for any of this software. This material is
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* provided "AS-IS" and at no charge.
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*/
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/*
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* Includes, defines, variables, module parameters, ...
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*/
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/* Module and version information */
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#define DRV_NAME "iTCO_vendor_support"
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#define DRV_VERSION "1.02"
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#define PFX DRV_NAME ": "
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/* Includes */
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#include <linux/module.h> /* For module specific items */
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#include <linux/moduleparam.h> /* For new moduleparam's */
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#include <linux/types.h> /* For standard types (like size_t) */
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#include <linux/errno.h> /* For the -ENODEV/... values */
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#include <linux/kernel.h> /* For printk/panic/... */
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#include <linux/init.h> /* For __init/__exit/... */
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#include <linux/ioport.h> /* For io-port access */
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#include <linux/io.h> /* For inb/outb/... */
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#include "iTCO_vendor.h"
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/* iTCO defines */
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#define SMI_EN acpibase + 0x30 /* SMI Control and Enable Register */
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#define TCOBASE acpibase + 0x60 /* TCO base address */
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#define TCO1_STS TCOBASE + 0x04 /* TCO1 Status Register */
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/* List of vendor support modes */
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/* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */
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#define SUPERMICRO_OLD_BOARD 1
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/* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems */
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#define SUPERMICRO_NEW_BOARD 2
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static int vendorsupport;
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module_param(vendorsupport, int, 0);
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MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=0 (none), 1=SuperMicro Pent3, 2=SuperMicro Pent4+");
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/*
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* Vendor Specific Support
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*/
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/*
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* Vendor Support: 1
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* Board: Super Micro Computer Inc. 370SSE+-OEM1/P3TSSE
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* iTCO chipset: ICH2
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*
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* Code contributed by: R. Seretny <lkpatches@paypc.com>
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* Documentation obtained by R. Seretny from SuperMicro Technical Support
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*
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* To enable Watchdog function:
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* BIOS setup -> Power -> TCO Logic SMI Enable -> Within5Minutes
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* This setting enables SMI to clear the watchdog expired flag.
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* If BIOS or CPU fail which may cause SMI hang, then system will
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* reboot. When application starts to use watchdog function,
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* application has to take over the control from SMI.
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*
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* For P3TSSE, J36 jumper needs to be removed to enable the Watchdog
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* function.
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*
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* Note: The system will reboot when Expire Flag is set TWICE.
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* So, if the watchdog timer is 20 seconds, then the maximum hang
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* time is about 40 seconds, and the minimum hang time is about
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* 20.6 seconds.
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*/
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static void supermicro_old_pre_keepalive(unsigned long acpibase)
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{
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/* Reload TCO Timer (done in iTCO_wdt_keepalive) + */
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/* Clear "Expire Flag" (Bit 3 of TC01_STS register) */
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outb(0x08, TCO1_STS);
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}
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/*
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* Vendor Support: 2
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* Board: Super Micro Computer Inc. P4SBx, P4DPx
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* iTCO chipset: ICH4
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*
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* Code contributed by: R. Seretny <lkpatches@paypc.com>
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* Documentation obtained by R. Seretny from SuperMicro Technical Support
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*
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* To enable Watchdog function:
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* 1. BIOS
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* For P4SBx:
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* BIOS setup -> Advanced -> Integrated Peripherals -> Watch Dog Feature
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* For P4DPx:
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* BIOS setup -> Advanced -> I/O Device Configuration -> Watch Dog
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* This setting enables or disables Watchdog function. When enabled, the
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* default watchdog timer is set to be 5 minutes (about 4m35s). It is
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* enough to load and run the OS. The application (service or driver) has
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* to take over the control once OS is running up and before watchdog
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* expires.
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*
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* 2. JUMPER
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* For P4SBx: JP39
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* For P4DPx: JP37
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* This jumper is used for safety. Closed is enabled. This jumper
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* prevents user enables watchdog in BIOS by accident.
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*
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* To enable Watch Dog function, both BIOS and JUMPER must be enabled.
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*
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* The documentation lists motherboards P4SBx and P4DPx series as of
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* 20-March-2002. However, this code works flawlessly with much newer
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* motherboards, such as my X6DHR-8G2 (SuperServer 6014H-82).
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*
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* The original iTCO driver as written does not actually reset the
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* watchdog timer on these machines, as a result they reboot after five
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* minutes.
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*
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* NOTE: You may leave the Watchdog function disabled in the SuperMicro
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* BIOS to avoid a "boot-race"... This driver will enable watchdog
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* functionality even if it's disabled in the BIOS once the /dev/watchdog
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* file is opened.
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*/
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/* I/O Port's */
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#define SM_REGINDEX 0x2e /* SuperMicro ICH4+ Register Index */
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#define SM_DATAIO 0x2f /* SuperMicro ICH4+ Register Data I/O */
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/* Control Register's */
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#define SM_CTLPAGESW 0x07 /* SuperMicro ICH4+ Control Page Switch */
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#define SM_CTLPAGE 0x08 /* SuperMicro ICH4+ Control Page Num */
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#define SM_WATCHENABLE 0x30 /* Watchdog enable: Bit 0: 0=off, 1=on */
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#define SM_WATCHPAGE 0x87 /* Watchdog unlock control page */
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#define SM_ENDWATCH 0xAA /* Watchdog lock control page */
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#define SM_COUNTMODE 0xf5 /* Watchdog count mode select */
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/* (Bit 3: 0 = seconds, 1 = minutes */
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#define SM_WATCHTIMER 0xf6 /* 8-bits, Watchdog timer counter (RW) */
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#define SM_RESETCONTROL 0xf7 /* Watchdog reset control */
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/* Bit 6: timer is reset by kbd interrupt */
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/* Bit 7: timer is reset by mouse interrupt */
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static void supermicro_new_unlock_watchdog(void)
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{
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/* Write 0x87 to port 0x2e twice */
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outb(SM_WATCHPAGE, SM_REGINDEX);
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outb(SM_WATCHPAGE, SM_REGINDEX);
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/* Switch to watchdog control page */
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outb(SM_CTLPAGESW, SM_REGINDEX);
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outb(SM_CTLPAGE, SM_DATAIO);
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}
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static void supermicro_new_lock_watchdog(void)
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{
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outb(SM_ENDWATCH, SM_REGINDEX);
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}
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static void supermicro_new_pre_start(unsigned int heartbeat)
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{
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unsigned int val;
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supermicro_new_unlock_watchdog();
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/* Watchdog timer setting needs to be in seconds*/
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outb(SM_COUNTMODE, SM_REGINDEX);
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val = inb(SM_DATAIO);
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val &= 0xF7;
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outb(val, SM_DATAIO);
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/* Write heartbeat interval to WDOG */
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outb(SM_WATCHTIMER, SM_REGINDEX);
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outb((heartbeat & 255), SM_DATAIO);
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/* Make sure keyboard/mouse interrupts don't interfere */
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outb(SM_RESETCONTROL, SM_REGINDEX);
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val = inb(SM_DATAIO);
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val &= 0x3f;
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outb(val, SM_DATAIO);
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/* enable watchdog by setting bit 0 of Watchdog Enable to 1 */
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outb(SM_WATCHENABLE, SM_REGINDEX);
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val = inb(SM_DATAIO);
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val |= 0x01;
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outb(val, SM_DATAIO);
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supermicro_new_lock_watchdog();
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}
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static void supermicro_new_pre_stop(void)
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{
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unsigned int val;
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supermicro_new_unlock_watchdog();
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/* disable watchdog by setting bit 0 of Watchdog Enable to 0 */
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outb(SM_WATCHENABLE, SM_REGINDEX);
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val = inb(SM_DATAIO);
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val &= 0xFE;
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outb(val, SM_DATAIO);
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supermicro_new_lock_watchdog();
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}
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static void supermicro_new_pre_set_heartbeat(unsigned int heartbeat)
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{
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supermicro_new_unlock_watchdog();
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/* reset watchdog timeout to heartveat value */
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outb(SM_WATCHTIMER, SM_REGINDEX);
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outb((heartbeat & 255), SM_DATAIO);
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supermicro_new_lock_watchdog();
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}
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/*
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* Generic Support Functions
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*/
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void iTCO_vendor_pre_start(unsigned long acpibase,
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unsigned int heartbeat)
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{
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if (vendorsupport == SUPERMICRO_NEW_BOARD)
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supermicro_new_pre_start(heartbeat);
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}
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EXPORT_SYMBOL(iTCO_vendor_pre_start);
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void iTCO_vendor_pre_stop(unsigned long acpibase)
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{
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if (vendorsupport == SUPERMICRO_NEW_BOARD)
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supermicro_new_pre_stop();
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}
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EXPORT_SYMBOL(iTCO_vendor_pre_stop);
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void iTCO_vendor_pre_keepalive(unsigned long acpibase, unsigned int heartbeat)
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{
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if (vendorsupport == SUPERMICRO_OLD_BOARD)
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supermicro_old_pre_keepalive(acpibase);
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else if (vendorsupport == SUPERMICRO_NEW_BOARD)
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supermicro_new_pre_set_heartbeat(heartbeat);
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}
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EXPORT_SYMBOL(iTCO_vendor_pre_keepalive);
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void iTCO_vendor_pre_set_heartbeat(unsigned int heartbeat)
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{
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if (vendorsupport == SUPERMICRO_NEW_BOARD)
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supermicro_new_pre_set_heartbeat(heartbeat);
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}
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EXPORT_SYMBOL(iTCO_vendor_pre_set_heartbeat);
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int iTCO_vendor_check_noreboot_on(void)
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{
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switch (vendorsupport) {
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case SUPERMICRO_OLD_BOARD:
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return 0;
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default:
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return 1;
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}
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}
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EXPORT_SYMBOL(iTCO_vendor_check_noreboot_on);
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static int __init iTCO_vendor_init_module(void)
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{
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printk(KERN_INFO PFX "vendor-support=%d\n", vendorsupport);
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return 0;
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}
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static void __exit iTCO_vendor_exit_module(void)
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{
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printk(KERN_INFO PFX "Module Unloaded\n");
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}
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module_init(iTCO_vendor_init_module);
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module_exit(iTCO_vendor_exit_module);
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MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>, R. Seretny <lkpatches@paypc.com>");
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MODULE_DESCRIPTION("Intel TCO Vendor Specific WatchDog Timer Driver Support");
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MODULE_VERSION(DRV_VERSION);
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MODULE_LICENSE("GPL");
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