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197 lines
5.2 KiB
197 lines
5.2 KiB
Kernel driver smsc47b397 |
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======================== |
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Supported chips: |
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* SMSC LPC47B397-NC |
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* SMSC SCH5307-NS |
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* SMSC SCH5317 |
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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: |
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- Mark M. Hoffman <[email protected]> |
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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 [1]_ 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 <[email protected]>. |
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.. [1] And SMSC SCH5307-NS and SCH5317, which have different device IDs but are |
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otherwise compatible. |
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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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------------------------------------------------------------------------- |
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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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=============== ======= ======================================================= |
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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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=============== ======= ======================================================= |
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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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=============== ======= ======= ================================= |
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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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=============== ======= ======= ================================= |
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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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-------------------------------------- |
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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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---------------------- |
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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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^^^^^^^^^^^^^^^^^^^^^^^^ |
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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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^^^^^^^^^^^^^^^^^^ |
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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: |
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If accessing the Global Configuration Registers, step (a) is not required. |
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Exit Configuration Mode |
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^^^^^^^^^^^^^^^^^^^^^^^ |
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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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^^^^^^^^^^^^^^^^^^^ |
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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 (0x81 for SCH5307-NS, and 0x85 for SCH5317) |
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The Device Rev currently reads 0x01 |
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Obtaining the HWM Base Address |
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------------------------------ |
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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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