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216 lines
6.4 KiB
216 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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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 <[email protected]>. |
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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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int iTCO_vendorsupport; |
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EXPORT_SYMBOL(iTCO_vendorsupport); |
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module_param_named(vendorsupport, iTCO_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 <[email protected]> |
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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 <[email protected]> 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 (iTCO_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 (iTCO_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 (iTCO_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 (iTCO_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", iTCO_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 <[email protected]>, " |
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"R. Seretny <[email protected]>"); |
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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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