diff options
Diffstat (limited to 'drivers/char/watchdog/iTCO_vendor_support.c')
| -rw-r--r-- | drivers/char/watchdog/iTCO_vendor_support.c | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/drivers/char/watchdog/iTCO_vendor_support.c b/drivers/char/watchdog/iTCO_vendor_support.c new file mode 100644 index 00000000000..41508399009 --- /dev/null +++ b/drivers/char/watchdog/iTCO_vendor_support.c @@ -0,0 +1,307 @@ +/* + * intel TCO vendor specific watchdog driver support + * + * (c) Copyright 2006 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 + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * 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, ... + */ + +/* 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 ": " + +/* 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 <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 */ + +/* 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; +module_param(vendorsupport, int, 0); +MODULE_PARM_DESC(vendorsupport, "iTCO vendor specific support mode, default=0 (none), 1=SuperMicro Pent3, 2=SuperMicro Pent4+"); + +/* + * 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(unsigned long acpibase) +{ + unsigned long val32; + + val32 = inl(SMI_EN); + val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */ + outl(val32, SMI_EN); /* Needed to activate watchdog */ +} + +static void supermicro_old_pre_stop(unsigned long acpibase) +{ + 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); +} + +/* + * Vendor Support: 2 + * Board: Super Micro Computer Inc. P4SBx, P4DPx + * iTCO chipset: ICH4 + * + * Code contributed by: R. Seretny <lkpatches@paypc.com> + * Documentation obtained by R. Seretny from SuperMicro Technical Support + * + * To enable Watchdog function: + * 1. BIOS + * For P4SBx: + * BIOS setup -> Advanced -> Integrated Peripherals -> Watch Dog Feature + * For P4DPx: + * BIOS setup -> Advanced -> I/O Device Configuration -> Watch Dog + * This setting enables or disables Watchdog function. When enabled, the + * default watchdog timer is set to be 5 minutes (about 4’35”). It is + * enough to load and run the OS. The application (service or driver) has + * to take over the control once OS is running up and before watchdog + * expires. + * + * 2. JUMPER + * For P4SBx: JP39 + * For P4DPx: JP37 + * This jumper is used for safety. Closed is enabled. This jumper + * prevents user enables watchdog in BIOS by accident. + * + * To enable Watch Dog function, both BIOS and JUMPER must be enabled. + * + * The documentation lists motherboards P4SBx and P4DPx series as of + * 20-March-2002. However, this code works flawlessly with much newer + * motherboards, such as my X6DHR-8G2 (SuperServer 6014H-82). + * + * The original iTCO driver as written does not actually reset the + * watchdog timer on these machines, as a result they reboot after five + * minutes. + * + * NOTE: You may leave the Watchdog function disabled in the SuperMicro + * BIOS to avoid a "boot-race"... This driver will enable watchdog + * functionality even if it's disabled in the BIOS once the /dev/watchdog + * file is opened. + */ + +/* I/O Port's */ +#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_WATCHENABLE 0x30 /* Watchdog enable: Bit 0: 0=off, 1=on */ + +#define SM_WATCHPAGE 0x87 /* Watchdog unlock 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_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 */ + +static void supermicro_new_unlock_watchdog(void) +{ + outb(SM_WATCHPAGE, SM_REGINDEX); /* Write 0x87 to port 0x2e twice */ + outb(SM_WATCHPAGE, SM_REGINDEX); + + outb(SM_CTLPAGESW, SM_REGINDEX); /* Switch to watchdog control page */ + outb(SM_CTLPAGE, SM_DATAIO); +} + +static void supermicro_new_lock_watchdog(void) +{ + outb(SM_ENDWATCH, SM_REGINDEX); +} + +static void supermicro_new_pre_start(unsigned int heartbeat) +{ + unsigned int val; + + supermicro_new_unlock_watchdog(); + + /* Watchdog timer setting needs to be in seconds*/ + outb(SM_COUNTMODE, SM_REGINDEX); + val = inb(SM_DATAIO); + val &= 0xF7; + outb(val, SM_DATAIO); + + /* Write heartbeat interval to WDOG */ + outb (SM_WATCHTIMER, SM_REGINDEX); + outb((heartbeat & 255), SM_DATAIO); + + /* Make sure keyboard/mouse interrupts don't interfere */ + outb(SM_RESETCONTROL, SM_REGINDEX); + val = inb(SM_DATAIO); + val &= 0x3f; + outb(val, SM_DATAIO); + + /* enable watchdog by setting bit 0 of Watchdog Enable to 1 */ + outb(SM_WATCHENABLE, SM_REGINDEX); + val = inb(SM_DATAIO); + val |= 0x01; + outb(val, SM_DATAIO); + + supermicro_new_lock_watchdog(); +} + +static void supermicro_new_pre_stop(void) +{ + unsigned int val; + + supermicro_new_unlock_watchdog(); + + /* disable watchdog by setting bit 0 of Watchdog Enable to 0 */ + outb(SM_WATCHENABLE, SM_REGINDEX); + val = inb(SM_DATAIO); + val &= 0xFE; + outb(val, SM_DATAIO); + + supermicro_new_lock_watchdog(); +} + +static void supermicro_new_pre_set_heartbeat(unsigned int heartbeat) +{ + supermicro_new_unlock_watchdog(); + + /* reset watchdog timeout to heartveat value */ + outb(SM_WATCHTIMER, SM_REGINDEX); + outb((heartbeat & 255), SM_DATAIO); + + supermicro_new_lock_watchdog(); +} + +/* + * Generic Support Functions + */ + +void iTCO_vendor_pre_start(unsigned long acpibase, + unsigned int heartbeat) +{ + if (vendorsupport == SUPERMICRO_OLD_BOARD) + supermicro_old_pre_start(acpibase); + else if (vendorsupport == SUPERMICRO_NEW_BOARD) + supermicro_new_pre_start(heartbeat); +} +EXPORT_SYMBOL(iTCO_vendor_pre_start); + +void iTCO_vendor_pre_stop(unsigned long acpibase) +{ + if (vendorsupport == SUPERMICRO_OLD_BOARD) + supermicro_old_pre_stop(acpibase); + else if (vendorsupport == SUPERMICRO_NEW_BOARD) + supermicro_new_pre_stop(); +} +EXPORT_SYMBOL(iTCO_vendor_pre_stop); + +void iTCO_vendor_pre_keepalive(unsigned long acpibase, unsigned int heartbeat) +{ + if (vendorsupport == SUPERMICRO_OLD_BOARD) + supermicro_old_pre_keepalive(acpibase); + else if (vendorsupport == SUPERMICRO_NEW_BOARD) + supermicro_new_pre_set_heartbeat(heartbeat); +} +EXPORT_SYMBOL(iTCO_vendor_pre_keepalive); + +void iTCO_vendor_pre_set_heartbeat(unsigned int heartbeat) +{ + if (vendorsupport == SUPERMICRO_NEW_BOARD) + supermicro_new_pre_set_heartbeat(heartbeat); +} +EXPORT_SYMBOL(iTCO_vendor_pre_set_heartbeat); + +int iTCO_vendor_check_noreboot_on(void) +{ + switch(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) +{ + printk (KERN_INFO PFX "vendor-support=%d\n", vendorsupport); + return 0; +} + +static void __exit iTCO_vendor_exit_module(void) +{ + printk (KERN_INFO PFX "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"); + |