watchdog: iTCO: Drop vendor support (0bf75b9c) · Commits · git / linux-net

Documentation/watchdog/watchdog-parameters.rst

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		@@ -209,13 +209,6 @@ iTCO_wdt:

		-------------------------------------------------

		iTCO_vendor_support:
		vendorsupport:
		iTCO vendor specific support mode, default=0 (none),
		1=SuperMicro Pent3, 2=SuperMicro Pent4+, 911=Broken SMI BIOS

		-------------------------------------------------

		ib700wdt:
		timeout:
		Watchdog timeout in seconds. 0<= timeout <=30, default=30.

drivers/watchdog/Kconfig

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		@@ -1429,14 +1429,6 @@ config ITCO_WDT
		To compile this driver as a module, choose M here: the
		module will be called iTCO_wdt.

		config ITCO_VENDOR_SUPPORT
		bool "Intel TCO Timer/Watchdog Specific Vendor Support"
		depends on ITCO_WDT
		help
		Add vendor specific support to the intel TCO timer based watchdog
		devices. At this moment we only have additional support for some
		SuperMicro Inc. motherboards.

		config IT8712F_WDT
		tristate "IT8712F (Smart Guardian) Watchdog Timer"
		depends on (X86 \|\| COMPILE_TEST) && HAS_IOPORT

drivers/watchdog/Makefile

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		@@ -127,9 +127,6 @@ obj-$(CONFIG_IE6XX_WDT) += ie6xx_wdt.o
		obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o
		obj-$(CONFIG_LENOVO_SE10_WDT) += lenovo_se10_wdt.o
		obj-$(CONFIG_LENOVO_SE30_WDT) += lenovo_se30_wdt.o
		ifeq ($(CONFIG_ITCO_VENDOR_SUPPORT),y)
		obj-$(CONFIG_ITCO_WDT) += iTCO_vendor_support.o
		endif
		obj-$(CONFIG_IT8712F_WDT) += it8712f_wdt.o
		obj-$(CONFIG_IT87_WDT) += it87_wdt.o
		obj-$(CONFIG_HP_WATCHDOG) += hpwdt.o

drivers/watchdog/iTCO_vendor.h

deleted100644 → 0

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		/* SPDX-License-Identifier: GPL-2.0 */
		/* iTCO Vendor Specific Support hooks */
		#ifdef CONFIG_ITCO_VENDOR_SUPPORT
		extern int iTCO_vendorsupport;
		extern void iTCO_vendor_pre_start(struct resource *, unsigned int);
		extern void iTCO_vendor_pre_stop(struct resource *);
		extern int iTCO_vendor_check_noreboot_on(void);
		#else
		#define iTCO_vendorsupport 0
		#define iTCO_vendor_pre_start(acpibase, heartbeat) {}
		#define iTCO_vendor_pre_stop(acpibase) {}
		#define iTCO_vendor_check_noreboot_on() 1
		/* 1=check noreboot; 0=don't check */
		#endif

drivers/watchdog/iTCO_vendor_support.c

deleted100644 → 0

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		// SPDX-License-Identifier: GPL-2.0+
		/*
		* intel TCO vendor specific watchdog driver support
		*
		* (c) Copyright 2006-2009 Wim Van Sebroeck <wim@iguana.be>.
		*
		* Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
		* provide warranty for any of this software. This material is
		* provided "AS-IS" and at no charge.
		*/

		/*
		* Includes, defines, variables, module parameters, ...
		*/

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		/* Module and version information */
		#define DRV_NAME "iTCO_vendor_support"
		#define DRV_VERSION "1.04"

		/* Includes */
		#include <linux/module.h> /* For module specific items */
		#include <linux/moduleparam.h> /* For new moduleparam's */
		#include <linux/types.h> /* For standard types (like size_t) */
		#include <linux/errno.h> /* For the -ENODEV/... values */
		#include <linux/kernel.h> /* For printk/panic/... */
		#include <linux/init.h> /* For __init/__exit/... */
		#include <linux/ioport.h> /* For io-port access */
		#include <linux/io.h> /* For inb/outb/... */

		#include "iTCO_vendor.h"

		/* List of vendor support modes */
		/* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */
		#define SUPERMICRO_OLD_BOARD 1
		/* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems - no longer supported */
		#define SUPERMICRO_NEW_BOARD 2
		/* Broken BIOS */
		#define BROKEN_BIOS 911

		int iTCO_vendorsupport;
		EXPORT_SYMBOL(iTCO_vendorsupport);

		module_param_named(vendorsupport, iTCO_vendorsupport, int, 0);
		MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default="
		"0 (none), 1=SuperMicro Pent3, 911=Broken SMI BIOS");

		/*
		* Vendor Specific Support
		*/

		/*
		* Vendor Support: 1
		* Board: Super Micro Computer Inc. 370SSE+-OEM1/P3TSSE
		* iTCO chipset: ICH2
		*
		* Code contributed by: R. Seretny <lkpatches@paypc.com>
		* Documentation obtained by R. Seretny from SuperMicro Technical Support
		*
		* To enable Watchdog function:
		* BIOS setup -> Power -> TCO Logic SMI Enable -> Within5Minutes
		* This setting enables SMI to clear the watchdog expired flag.
		* If BIOS or CPU fail which may cause SMI hang, then system will
		* reboot. When application starts to use watchdog function,
		* application has to take over the control from SMI.
		*
		* For P3TSSE, J36 jumper needs to be removed to enable the Watchdog
		* function.
		*
		* Note: The system will reboot when Expire Flag is set TWICE.
		* So, if the watchdog timer is 20 seconds, then the maximum hang
		* time is about 40 seconds, and the minimum hang time is about
		* 20.6 seconds.
		*/

		static void supermicro_old_pre_start(struct resource *smires)
		{
		unsigned long val32;

		/* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */
		val32 = inl(smires->start);
		val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
		outl(val32, smires->start); /* Needed to activate watchdog */
		}

		static void supermicro_old_pre_stop(struct resource *smires)
		{
		unsigned long val32;

		/* Bit 13: TCO_EN -> 1 = Enables the TCO logic to generate SMI# */
		val32 = inl(smires->start);
		val32 \|= 0x00002000; /* Turn on SMI clearing watchdog */
		outl(val32, smires->start); /* Needed to deactivate watchdog */
		}

		/*
		* Vendor Support: 911
		* Board: Some Intel ICHx based motherboards
		* iTCO chipset: ICH7+
		*
		* Some Intel motherboards have a broken BIOS implementation: i.e.
		* the SMI handler clear's the TIMEOUT bit in the TC01_STS register
		* and does not reload the time. Thus the TCO watchdog does not reboot
		* the system.
		*
		* These are the conclusions of Andriy Gapon <avg@icyb.net.ua> after
		* debugging: the SMI handler is quite simple - it tests value in
		* TCO1_CNT against 0x800, i.e. checks TCO_TMR_HLT. If the bit is set
		* the handler goes into an infinite loop, apparently to allow the
		* second timeout and reboot. Otherwise it simply clears TIMEOUT bit
		* in TCO1_STS and that's it.
		* So the logic seems to be reversed, because it is hard to see how
		* TIMEOUT can get set to 1 and SMI generated when TCO_TMR_HLT is set
		* (other than a transitional effect).
		*
		* The only fix found to get the motherboard(s) to reboot is to put
		* the glb_smi_en bit to 0. This is a dirty hack that bypasses the
		* broken code by disabling Global SMI.
		*
		* WARNING: globally disabling SMI could possibly lead to dramatic
		* problems, especially on laptops! I.e. various ACPI things where
		* SMI is used for communication between OS and firmware.
		*
		* Don't use this fix if you don't need to!!!
		*/

		static void broken_bios_start(struct resource *smires)
		{
		unsigned long val32;

		val32 = inl(smires->start);
		/* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI#
		Bit 0: GBL_SMI_EN -> 0 = No SMI# will be generated by ICH. */
		val32 &= 0xffffdffe;
		outl(val32, smires->start);
		}

		static void broken_bios_stop(struct resource *smires)
		{
		unsigned long val32;

		val32 = inl(smires->start);
		/* Bit 13: TCO_EN -> 1 = Enables TCO logic generating an SMI#
		Bit 0: GBL_SMI_EN -> 1 = Turn global SMI on again. */
		val32 \|= 0x00002001;
		outl(val32, smires->start);
		}

		/*
		* Generic Support Functions
		*/

		void iTCO_vendor_pre_start(struct resource *smires,
		unsigned int heartbeat)
		{
		switch (iTCO_vendorsupport) {
		case SUPERMICRO_OLD_BOARD:
		supermicro_old_pre_start(smires);
		break;
		case BROKEN_BIOS:
		broken_bios_start(smires);
		break;
		}
		}
		EXPORT_SYMBOL(iTCO_vendor_pre_start);

		void iTCO_vendor_pre_stop(struct resource *smires)
		{
		switch (iTCO_vendorsupport) {
		case SUPERMICRO_OLD_BOARD:
		supermicro_old_pre_stop(smires);
		break;
		case BROKEN_BIOS:
		broken_bios_stop(smires);
		break;
		}
		}
		EXPORT_SYMBOL(iTCO_vendor_pre_stop);

		int iTCO_vendor_check_noreboot_on(void)
		{
		switch (iTCO_vendorsupport) {
		case SUPERMICRO_OLD_BOARD:
		return 0;
		default:
		return 1;
		}
		}
		EXPORT_SYMBOL(iTCO_vendor_check_noreboot_on);

		static int __init iTCO_vendor_init_module(void)
		{
		if (iTCO_vendorsupport == SUPERMICRO_NEW_BOARD) {
		pr_warn("Option vendorsupport=%d is no longer supported, "
		"please use the w83627hf_wdt driver instead\n",
		SUPERMICRO_NEW_BOARD);
		return -EINVAL;
		}
		pr_info("vendor-support=%d\n", iTCO_vendorsupport);
		return 0;
		}

		static void __exit iTCO_vendor_exit_module(void)
		{
		pr_info("Module Unloaded\n");
		}

		module_init(iTCO_vendor_init_module);
		module_exit(iTCO_vendor_exit_module);

		MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>, "
		"R. Seretny <lkpatches@paypc.com>");
		MODULE_DESCRIPTION("Intel TCO Vendor Specific WatchDog Timer Driver Support");
		MODULE_VERSION(DRV_VERSION);
		MODULE_LICENSE("GPL");