220 lines
6.5 KiB
C
220 lines
6.5 KiB
C
/*
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* intel TCO vendor specific watchdog driver support
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*
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* (c) Copyright 2006-2009 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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 "1.04"
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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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/* 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 - no longer supported */
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#define SUPERMICRO_NEW_BOARD 2
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/* Broken BIOS */
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#define BROKEN_BIOS 911
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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="
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"0 (none), 1=SuperMicro Pent3, 911=Broken SMI BIOS");
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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_start(struct resource *smires)
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{
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unsigned long val32;
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/* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
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val32 = inl(smires->start);
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val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
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outl(val32, smires->start); /* Needed to activate watchdog */
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}
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static void supermicro_old_pre_stop(struct resource *smires)
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{
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unsigned long val32;
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/* Bit 13: TCO_EN -> 1 = Enables the TCO logic to generate SMI# */
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val32 = inl(smires->start);
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val32 |= 0x00002000; /* Turn on SMI clearing watchdog */
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outl(val32, smires->start); /* Needed to deactivate watchdog */
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}
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/*
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* Vendor Support: 911
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* Board: Some Intel ICHx based motherboards
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* iTCO chipset: ICH7+
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*
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* Some Intel motherboards have a broken BIOS implementation: i.e.
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* the SMI handler clear's the TIMEOUT bit in the TC01_STS register
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* and does not reload the time. Thus the TCO watchdog does not reboot
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* the system.
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*
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* These are the conclusions of Andriy Gapon <avg@icyb.net.ua> after
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* debugging: the SMI handler is quite simple - it tests value in
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* TCO1_CNT against 0x800, i.e. checks TCO_TMR_HLT. If the bit is set
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* the handler goes into an infinite loop, apparently to allow the
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* second timeout and reboot. Otherwise it simply clears TIMEOUT bit
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* in TCO1_STS and that's it.
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* So the logic seems to be reversed, because it is hard to see how
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* TIMEOUT can get set to 1 and SMI generated when TCO_TMR_HLT is set
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* (other than a transitional effect).
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*
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* The only fix found to get the motherboard(s) to reboot is to put
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* the glb_smi_en bit to 0. This is a dirty hack that bypasses the
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* broken code by disabling Global SMI.
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*
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* WARNING: globally disabling SMI could possibly lead to dramatic
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* problems, especially on laptops! I.e. various ACPI things where
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* SMI is used for communication between OS and firmware.
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*
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* Don't use this fix if you don't need to!!!
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*/
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static void broken_bios_start(struct resource *smires)
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{
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unsigned long val32;
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val32 = inl(smires->start);
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/* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI#
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Bit 0: GBL_SMI_EN -> 0 = No SMI# will be generated by ICH. */
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val32 &= 0xffffdffe;
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outl(val32, smires->start);
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}
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static void broken_bios_stop(struct resource *smires)
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{
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unsigned long val32;
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val32 = inl(smires->start);
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/* Bit 13: TCO_EN -> 1 = Enables TCO logic generating an SMI#
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Bit 0: GBL_SMI_EN -> 1 = Turn global SMI on again. */
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val32 |= 0x00002001;
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outl(val32, smires->start);
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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(struct resource *smires,
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unsigned int heartbeat)
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{
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switch (vendorsupport) {
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case SUPERMICRO_OLD_BOARD:
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supermicro_old_pre_start(smires);
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break;
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case BROKEN_BIOS:
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broken_bios_start(smires);
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break;
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}
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}
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EXPORT_SYMBOL(iTCO_vendor_pre_start);
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void iTCO_vendor_pre_stop(struct resource *smires)
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{
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switch (vendorsupport) {
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case SUPERMICRO_OLD_BOARD:
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supermicro_old_pre_stop(smires);
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break;
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case BROKEN_BIOS:
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broken_bios_stop(smires);
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break;
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}
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}
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EXPORT_SYMBOL(iTCO_vendor_pre_stop);
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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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if (vendorsupport == SUPERMICRO_NEW_BOARD) {
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pr_warn("Option vendorsupport=%d is no longer supported, "
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"please use the w83627hf_wdt driver instead\n",
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SUPERMICRO_NEW_BOARD);
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return -EINVAL;
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}
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pr_info("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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pr_info("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>, "
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"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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