Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

Kernel driver smsc47b397

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Supported chips:

  * SMSC LPC47B397-NC

  * SMSC SCH5307-NS

  * SMSC SCH5317

    Prefix: 'smsc47b397'

    Addresses scanned: none, address read from Super I/O config space

    Datasheet: In this file

Authors: Mark M. Hoffman 

         Utilitek Systems, Inc.

November 23, 2004

The following specification describes the SMSC LPC47B397-NC[1] sensor chip

(for which there is no public datasheet available). This document was

provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected

by Mark M. Hoffman .

[1] And SMSC SCH5307-NS and SCH5317, which have different device IDs but are

otherwise compatible.

* * * * *

Methods for detecting the HP SIO and reading the thermal data on a dc7100.

The thermal information on the dc7100 is contained in the SIO Hardware Monitor

(HWM). The information is accessed through an index/data pair. The index/data

pair is located at the HWM Base Address + 0 and the HWM Base Address + 1. The

HWM Base address can be obtained from Logical Device 8, registers 0x60 (MSB)

and 0x61 (LSB). Currently we are using 0x480 for the HWM Base Address and

0x480 and 0x481 for the index/data pair.

Reading temperature information.

The temperature information is located in the following registers:

Temp1           0x25    (Currently, this reflects the CPU temp on all systems).

Temp2           0x26

Temp3           0x27

Temp4           0x80

Programming Example

The following is an example of how to read the HWM temperature registers:

MOV     DX,480H

MOV     AX,25H

OUT     DX,AL

MOV     DX,481H

IN      AL,DX

AL contains the data in hex, the temperature in Celsius is the decimal

equivalent.

Ex: If AL contains 0x2A, the temperature is 42 degrees C.

Reading tach information.

The fan speed information is located in the following registers:

                LSB     MSB

Tach1           0x28    0x29    (Currently, this reflects the CPU

                                fan speed on all systems).

Tach2           0x2A    0x2B

Tach3           0x2C    0x2D

Tach4           0x2E    0x2F

Important!!!

Reading the tach LSB locks the tach MSB.

The LSB Must be read first.

How to convert the tach reading to RPM.

The tach reading (TCount) is given by: (Tach MSB * 256) + (Tach LSB)

The SIO counts the number of 90kHz (11.111us) pulses per revolution.

RPM = 60/(TCount * 11.111us)

Example:

Reg 0x28 = 0x9B

Reg 0x29 = 0x08

TCount = 0x89B = 2203

RPM = 60 / (2203 * 11.11111 E-6) = 2451 RPM

Obtaining the SIO version.

CONFIGURATION SEQUENCE

To program the configuration registers, the following sequence must be followed:

1. Enter Configuration Mode

2. Configure the Configuration Registers

3. Exit Configuration Mode.

Enter Configuration Mode

To place the chip into the Configuration State The config key (0x55) is written

to the CONFIG PORT (0x2E).

Configuration Mode

In configuration mode, the INDEX PORT is located at the CONFIG PORT address and

the DATA PORT is at INDEX PORT address + 1.

The desired configuration registers are accessed in two steps:

a.      Write the index of the Logical Device Number Configuration Register

        (i.e., 0x07) to the INDEX PORT and then write the number of the

        desired logical device to the DATA PORT.

b.      Write the address of the desired configuration register within the

        logical device to the INDEX PORT and then write or read the config-

        uration register through the DATA PORT.

Note: If accessing the Global Configuration Registers, step (a) is not required.

Exit Configuration Mode

To exit the Configuration State the write 0xAA to the CONFIG PORT (0x2E).

The chip returns to the RUN State.  (This is important).

Programming Example

The following is an example of how to read the SIO Device ID located at 0x20

; ENTER CONFIGURATION MODE

MOV     DX,02EH

MOV     AX,055H

OUT     DX,AL

; GLOBAL CONFIGURATION  REGISTER

MOV     DX,02EH

MOV     AL,20H

OUT     DX,AL

; READ THE DATA

MOV     DX,02FH

IN      AL,DX

; EXIT CONFIGURATION MODE

MOV     DX,02EH

MOV     AX,0AAH

OUT     DX,AL

The registers of interest for identifying the SIO on the dc7100 are Device ID

(0x20) and Device Rev  (0x21).

The Device ID will read 0x6F (0x81 for SCH5307-NS, and 0x85 for SCH5317)

The Device Rev currently reads 0x01

Obtaining the HWM Base Address.

The following is an example of how to read the HWM Base Address located in

Logical Device 8.

; ENTER CONFIGURATION MODE

MOV     DX,02EH

MOV     AX,055H

OUT     DX,AL

; CONFIGURE REGISTER CRE0,

; LOGICAL DEVICE 8

MOV     DX,02EH

MOV     AL,07H

OUT     DX,AL ;Point to LD# Config Reg

MOV     DX,02FH

MOV     AL, 08H

OUT     DX,AL;Point to Logical Device 8

;

MOV     DX,02EH

MOV     AL,60H

OUT     DX,AL   ; Point to HWM Base Addr MSB

MOV     DX,02FH

IN      AL,DX   ; Get MSB of HWM Base Addr

; EXIT CONFIGURATION MODE

MOV     DX,02EH

MOV     AX,0AAH

OUT     DX,AL