ede7fbdf52
Part 3: Move the drivers documentation, plus two general documentation files. Note that the patch "adds trailing whitespace", because it does move the files as-is, and some files happen to have trailing whitespace. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
159 lines
4.3 KiB
Plaintext
159 lines
4.3 KiB
Plaintext
Kernel driver smsc47b397
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========================
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Supported chips:
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* SMSC LPC47B397-NC
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Prefix: 'smsc47b397'
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Addresses scanned: none, address read from Super I/O config space
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Datasheet: In this file
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Authors: Mark M. Hoffman <mhoffman@lightlink.com>
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Utilitek Systems, Inc.
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November 23, 2004
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The following specification describes the SMSC LPC47B397-NC sensor chip
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(for which there is no public datasheet available). This document was
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provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected
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by Mark M. Hoffman <mhoffman@lightlink.com>.
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* * * * *
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Methods for detecting the HP SIO and reading the thermal data on a dc7100.
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The thermal information on the dc7100 is contained in the SIO Hardware Monitor
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(HWM). The information is accessed through an index/data pair. The index/data
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pair is located at the HWM Base Address + 0 and the HWM Base Address + 1. The
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HWM Base address can be obtained from Logical Device 8, registers 0x60 (MSB)
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and 0x61 (LSB). Currently we are using 0x480 for the HWM Base Address and
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0x480 and 0x481 for the index/data pair.
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Reading temperature information.
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The temperature information is located in the following registers:
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Temp1 0x25 (Currently, this reflects the CPU temp on all systems).
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Temp2 0x26
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Temp3 0x27
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Temp4 0x80
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Programming Example
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The following is an example of how to read the HWM temperature registers:
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MOV DX,480H
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MOV AX,25H
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OUT DX,AL
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MOV DX,481H
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IN AL,DX
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AL contains the data in hex, the temperature in Celsius is the decimal
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equivalent.
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Ex: If AL contains 0x2A, the temperature is 42 degrees C.
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Reading tach information.
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The fan speed information is located in the following registers:
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LSB MSB
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Tach1 0x28 0x29 (Currently, this reflects the CPU
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fan speed on all systems).
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Tach2 0x2A 0x2B
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Tach3 0x2C 0x2D
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Tach4 0x2E 0x2F
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Important!!!
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Reading the tach LSB locks the tach MSB.
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The LSB Must be read first.
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How to convert the tach reading to RPM.
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The tach reading (TCount) is given by: (Tach MSB * 256) + (Tach LSB)
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The SIO counts the number of 90kHz (11.111us) pulses per revolution.
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RPM = 60/(TCount * 11.111us)
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Example:
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Reg 0x28 = 0x9B
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Reg 0x29 = 0x08
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TCount = 0x89B = 2203
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RPM = 60 / (2203 * 11.11111 E-6) = 2451 RPM
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Obtaining the SIO version.
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CONFIGURATION SEQUENCE
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To program the configuration registers, the following sequence must be followed:
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1. Enter Configuration Mode
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2. Configure the Configuration Registers
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3. Exit Configuration Mode.
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Enter Configuration Mode
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To place the chip into the Configuration State The config key (0x55) is written
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to the CONFIG PORT (0x2E).
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Configuration Mode
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In configuration mode, the INDEX PORT is located at the CONFIG PORT address and
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the DATA PORT is at INDEX PORT address + 1.
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The desired configuration registers are accessed in two steps:
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a. Write the index of the Logical Device Number Configuration Register
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(i.e., 0x07) to the INDEX PORT and then write the number of the
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desired logical device to the DATA PORT.
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b. Write the address of the desired configuration register within the
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logical device to the INDEX PORT and then write or read the config-
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uration register through the DATA PORT.
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Note: If accessing the Global Configuration Registers, step (a) is not required.
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Exit Configuration Mode
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To exit the Configuration State the write 0xAA to the CONFIG PORT (0x2E).
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The chip returns to the RUN State. (This is important).
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Programming Example
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The following is an example of how to read the SIO Device ID located at 0x20
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; ENTER CONFIGURATION MODE
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MOV DX,02EH
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MOV AX,055H
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OUT DX,AL
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; GLOBAL CONFIGURATION REGISTER
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MOV DX,02EH
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MOV AL,20H
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OUT DX,AL
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; READ THE DATA
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MOV DX,02FH
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IN AL,DX
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; EXIT CONFIGURATION MODE
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MOV DX,02EH
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MOV AX,0AAH
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OUT DX,AL
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The registers of interest for identifying the SIO on the dc7100 are Device ID
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(0x20) and Device Rev (0x21).
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The Device ID will read 0X6F
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The Device Rev currently reads 0x01
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Obtaining the HWM Base Address.
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The following is an example of how to read the HWM Base Address located in
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Logical Device 8.
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; ENTER CONFIGURATION MODE
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MOV DX,02EH
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MOV AX,055H
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OUT DX,AL
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; CONFIGURE REGISTER CRE0,
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; LOGICAL DEVICE 8
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MOV DX,02EH
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MOV AL,07H
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OUT DX,AL ;Point to LD# Config Reg
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MOV DX,02FH
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MOV AL, 08H
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OUT DX,AL;Point to Logical Device 8
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;
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MOV DX,02EH
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MOV AL,60H
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OUT DX,AL ; Point to HWM Base Addr MSB
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MOV DX,02FH
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IN AL,DX ; Get MSB of HWM Base Addr
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; EXIT CONFIGURATION MODE
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MOV DX,02EH
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MOV AX,0AAH
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OUT DX,AL
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