diff options
Diffstat (limited to 'drivers/watchdog/iTCO_vendor_support.c')
| -rw-r--r-- | drivers/watchdog/iTCO_vendor_support.c | 190 |
1 files changed, 127 insertions, 63 deletions
diff --git a/drivers/watchdog/iTCO_vendor_support.c b/drivers/watchdog/iTCO_vendor_support.c index cafc465f2ae..b6b2f90b5d4 100644 --- a/drivers/watchdog/iTCO_vendor_support.c +++ b/drivers/watchdog/iTCO_vendor_support.c @@ -1,7 +1,7 @@ /* * intel TCO vendor specific watchdog driver support * - * (c) Copyright 2006 Wim Van Sebroeck <wim@iguana.be>. + * (c) Copyright 2006-2009 Wim Van Sebroeck <wim@iguana.be>. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License @@ -17,11 +17,11 @@ * 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 "1.01" -#define DRV_RELDATE "11-Nov-2006" -#define PFX DRV_NAME ": " +#define DRV_NAME "iTCO_vendor_support" +#define DRV_VERSION "1.04" /* Includes */ #include <linux/module.h> /* For module specific items */ @@ -31,21 +31,23 @@ #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 <asm/io.h> /* For inb/outb/... */ - -/* iTCO defines */ -#define SMI_EN acpibase + 0x30 /* SMI Control and Enable Register */ -#define TCOBASE acpibase + 0x60 /* TCO base address */ -#define TCO1_STS TCOBASE + 0x04 /* TCO1 Status Register */ +#include "iTCO_vendor.h" /* List of vendor support modes */ -#define SUPERMICRO_OLD_BOARD 1 /* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */ -#define SUPERMICRO_NEW_BOARD 2 /* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems */ - -static int vendorsupport = 0; +/* SuperMicro Pentium 3 Era 370SSE+-OEM1/P3TSSE */ +#define SUPERMICRO_OLD_BOARD 1 +/* SuperMicro Pentium 4 / Xeon 4 / EMT64T Era Systems */ +#define SUPERMICRO_NEW_BOARD 2 +/* Broken BIOS */ +#define BROKEN_BIOS 911 + +static int vendorsupport; module_param(vendorsupport, int, 0); -MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=0 (none), 1=SuperMicro Pent3, 2=SuperMicro Pent4+"); +MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=" + "0 (none), 1=SuperMicro Pent3, 2=SuperMicro Pent4+, " + "911=Broken SMI BIOS"); /* * Vendor Specific Support @@ -75,29 +77,24 @@ MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=0 (n * 20.6 seconds. */ -static void supermicro_old_pre_start(unsigned long acpibase) +static void supermicro_old_pre_start(struct resource *smires) { unsigned long val32; - val32 = inl(SMI_EN); + /* Bit 13: TCO_EN -> 0 = Disables TCO logic generating an SMI# */ + val32 = inl(smires->start); val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */ - outl(val32, SMI_EN); /* Needed to activate watchdog */ + outl(val32, smires->start); /* Needed to activate watchdog */ } -static void supermicro_old_pre_stop(unsigned long acpibase) +static void supermicro_old_pre_stop(struct resource *smires) { unsigned long val32; - val32 = inl(SMI_EN); - val32 &= 0x00002000; /* Turn on SMI clearing watchdog */ - outl(val32, SMI_EN); /* Needed to deactivate watchdog */ -} - -static void supermicro_old_pre_keepalive(unsigned long acpibase) -{ - /* Reload TCO Timer (done in iTCO_wdt_keepalive) + */ - /* Clear "Expire Flag" (Bit 3 of TC01_STS register) */ - outb(0x08, TCO1_STS); + /* 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 */ } /* @@ -143,34 +140,35 @@ static void supermicro_old_pre_keepalive(unsigned long acpibase) */ /* I/O Port's */ -#define SM_REGINDEX 0x2e /* SuperMicro ICH4+ Register Index */ -#define SM_DATAIO 0x2f /* SuperMicro ICH4+ Register Data I/O */ +#define SM_REGINDEX 0x2e /* SuperMicro ICH4+ Register Index */ +#define SM_DATAIO 0x2f /* SuperMicro ICH4+ Register Data I/O */ /* Control Register's */ -#define SM_CTLPAGESW 0x07 /* SuperMicro ICH4+ Control Page Switch */ -#define SM_CTLPAGE 0x08 /* SuperMicro ICH4+ Control Page Num */ +#define SM_CTLPAGESW 0x07 /* SuperMicro ICH4+ Control Page Switch */ +#define SM_CTLPAGE 0x08 /* SuperMicro ICH4+ Control Page Num */ -#define SM_WATCHENABLE 0x30 /* Watchdog enable: Bit 0: 0=off, 1=on */ +#define SM_WATCHENABLE 0x30 /* Watchdog enable: Bit 0: 0=off, 1=on */ -#define SM_WATCHPAGE 0x87 /* Watchdog unlock control page */ +#define SM_WATCHPAGE 0x87 /* Watchdog unlock control page */ -#define SM_ENDWATCH 0xAA /* Watchdog lock control page */ +#define SM_ENDWATCH 0xAA /* Watchdog lock control page */ -#define SM_COUNTMODE 0xf5 /* Watchdog count mode select */ - /* (Bit 3: 0 = seconds, 1 = minutes */ +#define SM_COUNTMODE 0xf5 /* Watchdog count mode select */ + /* (Bit 3: 0 = seconds, 1 = minutes */ -#define SM_WATCHTIMER 0xf6 /* 8-bits, Watchdog timer counter (RW) */ +#define SM_WATCHTIMER 0xf6 /* 8-bits, Watchdog timer counter (RW) */ -#define SM_RESETCONTROL 0xf7 /* Watchdog reset control */ - /* Bit 6: timer is reset by kbd interrupt */ - /* Bit 7: timer is reset by mouse interrupt */ +#define SM_RESETCONTROL 0xf7 /* Watchdog reset control */ + /* Bit 6: timer is reset by kbd interrupt */ + /* Bit 7: timer is reset by mouse interrupt */ static void supermicro_new_unlock_watchdog(void) { - outb(SM_WATCHPAGE, SM_REGINDEX); /* Write 0x87 to port 0x2e twice */ + /* Write 0x87 to port 0x2e twice */ outb(SM_WATCHPAGE, SM_REGINDEX); - - outb(SM_CTLPAGESW, SM_REGINDEX); /* Switch to watchdog control page */ + outb(SM_WATCHPAGE, SM_REGINDEX); + /* Switch to watchdog control page */ + outb(SM_CTLPAGESW, SM_REGINDEX); outb(SM_CTLPAGE, SM_DATAIO); } @@ -192,7 +190,7 @@ static void supermicro_new_pre_start(unsigned int heartbeat) outb(val, SM_DATAIO); /* Write heartbeat interval to WDOG */ - outb (SM_WATCHTIMER, SM_REGINDEX); + outb(SM_WATCHTIMER, SM_REGINDEX); outb((heartbeat & 255), SM_DATAIO); /* Make sure keyboard/mouse interrupts don't interfere */ @@ -237,33 +235,98 @@ static void supermicro_new_pre_set_heartbeat(unsigned int heartbeat) } /* + * 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(unsigned long acpibase, +void iTCO_vendor_pre_start(struct resource *smires, unsigned int heartbeat) { - if (vendorsupport == SUPERMICRO_OLD_BOARD) - supermicro_old_pre_start(acpibase); - else if (vendorsupport == SUPERMICRO_NEW_BOARD) + switch (vendorsupport) { + case SUPERMICRO_OLD_BOARD: + supermicro_old_pre_start(smires); + break; + case SUPERMICRO_NEW_BOARD: supermicro_new_pre_start(heartbeat); + break; + case BROKEN_BIOS: + broken_bios_start(smires); + break; + } } EXPORT_SYMBOL(iTCO_vendor_pre_start); -void iTCO_vendor_pre_stop(unsigned long acpibase) +void iTCO_vendor_pre_stop(struct resource *smires) { - if (vendorsupport == SUPERMICRO_OLD_BOARD) - supermicro_old_pre_stop(acpibase); - else if (vendorsupport == SUPERMICRO_NEW_BOARD) + switch (vendorsupport) { + case SUPERMICRO_OLD_BOARD: + supermicro_old_pre_stop(smires); + break; + case SUPERMICRO_NEW_BOARD: supermicro_new_pre_stop(); + break; + case BROKEN_BIOS: + broken_bios_stop(smires); + break; + } } EXPORT_SYMBOL(iTCO_vendor_pre_stop); -void iTCO_vendor_pre_keepalive(unsigned long acpibase, unsigned int heartbeat) +void iTCO_vendor_pre_keepalive(struct resource *smires, unsigned int heartbeat) { - if (vendorsupport == SUPERMICRO_OLD_BOARD) - supermicro_old_pre_keepalive(acpibase); - else if (vendorsupport == SUPERMICRO_NEW_BOARD) + if (vendorsupport == SUPERMICRO_NEW_BOARD) supermicro_new_pre_set_heartbeat(heartbeat); } EXPORT_SYMBOL(iTCO_vendor_pre_keepalive); @@ -277,7 +340,7 @@ EXPORT_SYMBOL(iTCO_vendor_pre_set_heartbeat); int iTCO_vendor_check_noreboot_on(void) { - switch(vendorsupport) { + switch (vendorsupport) { case SUPERMICRO_OLD_BOARD: return 0; default: @@ -288,19 +351,20 @@ EXPORT_SYMBOL(iTCO_vendor_check_noreboot_on); static int __init iTCO_vendor_init_module(void) { - printk (KERN_INFO PFX "vendor-support=%d\n", vendorsupport); + pr_info("vendor-support=%d\n", vendorsupport); return 0; } static void __exit iTCO_vendor_exit_module(void) { - printk (KERN_INFO PFX "Module Unloaded\n"); + 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_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"); |