drivers/watchdog/iTCO_vendor_support.c

2  *	intel TCO vendor specific watchdog driver support
68  *	To enable Watchdog function:
70  *	    This setting enables SMI to clear the watchdog expired flag.
72  *	    reboot. When application starts to use watchdog function,
75  *	    For P3TSSE, J36 jumper needs to be removed to enable the Watchdog
79  *	    So, if the watchdog timer is 20 seconds, then the maximum hang
90 	val32 &= 0xffffdfff;	/* Turn off SMI clearing watchdog */  in supermicro_old_pre_start()
91 	outl(val32, SMI_EN);	/* Needed to activate watchdog */  in supermicro_old_pre_start()
100 	val32 |= 0x00002000;	/* Turn on SMI clearing watchdog */  in supermicro_old_pre_stop()
101 	outl(val32, SMI_EN);	/* Needed to deactivate watchdog */  in supermicro_old_pre_stop()
112  *	To enable Watchdog function:
118  *	 This setting enables or disables Watchdog function. When enabled, the
119  *	 default watchdog timer is set to be 5 minutes (about 4m35s). It is
121  *	 to take over the control once OS is running up and before watchdog
128  *	  prevents user enables watchdog in BIOS by accident.
137  *	watchdog timer on these machines, as a result they reboot after five
140  *	NOTE: You may leave the Watchdog function disabled in the SuperMicro
141  *	BIOS to avoid a "boot-race"... This driver will enable watchdog
142  *	functionality even if it's disabled in the BIOS once the /dev/watchdog
154 #define SM_WATCHENABLE	0x30	/* Watchdog enable: Bit 0: 0=off, 1=on */
156 #define SM_WATCHPAGE	0x87	/* Watchdog unlock control page */
158 #define SM_ENDWATCH	0xAA	/* Watchdog lock control page */
160 #define SM_COUNTMODE	0xf5	/* Watchdog count mode select */
163 #define SM_WATCHTIMER	0xf6	/* 8-bits, Watchdog timer counter (RW) */
165 #define SM_RESETCONTROL	0xf7	/* Watchdog reset control */
174 	/* Switch to watchdog control page */  in supermicro_new_unlock_watchdog()
190 	/* Watchdog timer setting needs to be in seconds*/  in supermicro_new_pre_start()
206 	/* enable watchdog by setting bit 0 of Watchdog Enable to 1 */  in supermicro_new_pre_start()
221 	/* disable watchdog by setting bit 0 of Watchdog Enable to 0 */  in supermicro_new_pre_stop()
234 	/* reset watchdog timeout to heartveat value */  in supermicro_new_pre_set_heartbeat()
248  *	and does not reload the time. Thus the TCO watchdog does not reboot
372 MODULE_DESCRIPTION("Intel TCO Vendor Specific WatchDog Timer Driver Support");