diff options
Diffstat (limited to 'drivers/watchdog/iTCO_vendor_support.c')
| -rw-r--r-- | drivers/watchdog/iTCO_vendor_support.c | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/drivers/watchdog/iTCO_vendor_support.c b/drivers/watchdog/iTCO_vendor_support.c deleted file mode 100644 index cf0eaa04b064..000000000000 --- a/drivers/watchdog/iTCO_vendor_support.c +++ /dev/null @@ -1,216 +0,0 @@ -// 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"); |