163 lines
4.4 KiB
Plaintext
163 lines
4.4 KiB
Plaintext
Kernel driver smsc47b397
|
|
========================
|
|
|
|
Supported chips:
|
|
* SMSC LPC47B397-NC
|
|
* SMSC SCH5307-NS
|
|
Prefix: 'smsc47b397'
|
|
Addresses scanned: none, address read from Super I/O config space
|
|
Datasheet: In this file
|
|
|
|
Authors: Mark M. Hoffman <mhoffman@lightlink.com>
|
|
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 <mhoffman@lightlink.com>.
|
|
|
|
[1] And SMSC SCH5307-NS, which has a different device ID but is 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 (for SCH5307-NS, 0x81)
|
|
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
|