lm75.asl

AMI 主板的BIOS源码

//**********************************************************************;
//     *****************************************************************;
//     *****************************************************************;
//     **                                                             **;
//     **      (C)Copyright 1985-1996, American Megatrends, Inc.      **;
//     **                                                             **;
//     **                     All Rights Reserved.                    **;
//     **                                                             **;
//     **           6145-F Northbelt Pkwy, Norcross, GA 30071         **;
//     **                                                             **;
//     **                     Phone [phone]                    **;
//     **                                                             **;
//     *****************************************************************;
//     *****************************************************************;
//**********************************************************************;
//		DON'T CHANGE ANY CODE UNLESS REQUIRED !!!
//**********************************************************************;
//		SMB support for LM75 thermal sensor
//**********************************************************************;

// change LM75 trip points
	Method(TCHG, 0) {

	Store(RBYT(TSAD, 0x00), Local0) // Read Current temp
/*
If(LGreaterEqual(Local0,TMAX)) {
			Store(TCRT, Local1) 	// Tcrt
			}
	Else	{
	If(LGreaterEqual(Local0,TMIN)) {
			Store(TMAX, Local1) 	// Thigh
			}
		Else {
		Store(TMIN, Local1)		// TLow
		}
	}
	STOS(0,Local1)			// Set Thigh

	STHY(0, Add(Local0, 2))		// Set TLow T + 2.0C to arm the Thermal int

//	Subtract(TMIN, 5, Local2)	// Set Thyst as TMIN-5.0

//	Add(Local0, 0x5, Local1)	// Set Thigh T + 5.0 C
	Subtract(Local0, 0x1, Local2)	// Set Tlow  T - 1.0 C
	Subtract(TMIN, 0x5, Local3)	// Set Tlow  TMIN - 5.0 C
//	If(LGreater(Local2,Local3))
//	{
//		Store(Local3, Local2)
//	}

	STHY(0,Local2)                  // Set TLow
*/
	STOS(TCRT)			// Set Thigh TCRT
	STHY(Subtract(Local0, 5))	// Set TLow TMIN-5.0C
       }

// Set configuration register
Method(SCFG, 1) {
	// Arg0 = configuration byte

	WBYT(TSAD, 0x01, Arg0)
	}

// Set Tos register

Method(STOS, 1) {
	// Arg0 = temperature word data

	// Set pointer register (occupy the command byte) to 0x03
	// Somehow LM75 wants to send out the MSB byte first !

	WWRD(TSAD, 0x03, Arg0)
	}

// Set Thyst register

Method(STHY, 1) {
	// Arg0 = temperature word data

	// Set pointer register (occupy the command byte) to 0x02
	// Somehow LM75 wants to send out the MSB byte first !

	WWRD(TSAD, 0x02, Arg0)
	}

// Read temperature register

Method(RTMP, 0) {
	// Set pointer register (occupy the command byte) to 0x00

	Store(RWRD(TSAD, 0x00), Local0)

Store(Local0, DBG8)

	// Somehow LM75 returns right byte first!

	If(Not(Local0)) 	// Read command completed
	{
		Return( Local0 )
	}
	Else 			// Read command failed
	{
		Store("_TMP Read ERROR", Debug)
		Return(Add(TMIN, 2))	// MIN trip point + 2.0 C
	}

	} // Method(RTMP)

// LM75 Thermal interrupt handler
Method(THDL,0) {
//**********************************************************************;
// Trip point handler
// TPOL status bit applys only for PIIX4 based design
	OperationRegion(PMB0, SystemIO, \_SB.PCI0.PMU.PMBS(), 0x28)
	Field(PMB0,ByteAcc,NoLock,Preserve){
		,2,
		TPOL,1,		// 28.2h Thermal Polarity bit
		}

	If(TPOL)
// Temp goes up, Tos threshold being crossed
	{
		\GFAN._ON()  	// Turn FAN On
	}
	Else
// Temp goes down, Thyst threshold being crossed
	{
		\GFAN._OFF()	// Turn FAN Off
	}

	TCHG()			// Reevaluate Thigh/TLow for LM75
	Not(TPOL,TPOL)		// Toggle the Polarity pin
//**********************************************************************;
}
//**********************************************************************;
//     *****************************************************************;
//     *****************************************************************;
//     **                                                             **;
//     **      (C)Copyright 1985-1996, American Megatrends, Inc.      **;
//     **                                                             **;
//     **                     All Rights Reserved.                    **;
//     **                                                             **;
//     **           6145-F Northbelt Pkwy, Norcross, GA 30071         **;
//     **                                                             **;
//     **                     Phone [phone]                    **;
//     **                                                             **;
//     *****************************************************************;
//     *****************************************************************;
//**********************************************************************;
//		DON'T CHANGE ANY CODE UNLESS REQUIRED !!!
//**********************************************************************;