1Kernel driver smsc47b397 2======================== 3 4Supported chips: 5 * SMSC LPC47B397-NC 6 * SMSC SCH5307-NS 7 * SMSC SCH5317 8 Prefix: 'smsc47b397' 9 Addresses scanned: none, address read from Super I/O config space 10 Datasheet: In this file 11 12Authors: Mark M. Hoffman <mhoffman@lightlink.com> 13 Utilitek Systems, Inc. 14 15November 23, 2004 16 17The following specification describes the SMSC LPC47B397-NC[1] sensor chip 18(for which there is no public datasheet available). This document was 19provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected 20by Mark M. Hoffman <mhoffman@lightlink.com>. 21 22[1] And SMSC SCH5307-NS and SCH5317, which have different device IDs but are 23otherwise compatible. 24 25* * * * * 26 27Methods for detecting the HP SIO and reading the thermal data on a dc7100. 28 29The thermal information on the dc7100 is contained in the SIO Hardware Monitor 30(HWM). The information is accessed through an index/data pair. The index/data 31pair is located at the HWM Base Address + 0 and the HWM Base Address + 1. The 32HWM Base address can be obtained from Logical Device 8, registers 0x60 (MSB) 33and 0x61 (LSB). Currently we are using 0x480 for the HWM Base Address and 340x480 and 0x481 for the index/data pair. 35 36Reading temperature information. 37The temperature information is located in the following registers: 38Temp1 0x25 (Currently, this reflects the CPU temp on all systems). 39Temp2 0x26 40Temp3 0x27 41Temp4 0x80 42 43Programming Example 44The following is an example of how to read the HWM temperature registers: 45MOV DX,480H 46MOV AX,25H 47OUT DX,AL 48MOV DX,481H 49IN AL,DX 50 51AL contains the data in hex, the temperature in Celsius is the decimal 52equivalent. 53 54Ex: If AL contains 0x2A, the temperature is 42 degrees C. 55 56Reading tach information. 57The fan speed information is located in the following registers: 58 LSB MSB 59Tach1 0x28 0x29 (Currently, this reflects the CPU 60 fan speed on all systems). 61Tach2 0x2A 0x2B 62Tach3 0x2C 0x2D 63Tach4 0x2E 0x2F 64 65Important!!! 66Reading the tach LSB locks the tach MSB. 67The LSB Must be read first. 68 69How to convert the tach reading to RPM. 70The tach reading (TCount) is given by: (Tach MSB * 256) + (Tach LSB) 71The SIO counts the number of 90kHz (11.111us) pulses per revolution. 72RPM = 60/(TCount * 11.111us) 73 74Example: 75Reg 0x28 = 0x9B 76Reg 0x29 = 0x08 77 78TCount = 0x89B = 2203 79 80RPM = 60 / (2203 * 11.11111 E-6) = 2451 RPM 81 82Obtaining the SIO version. 83 84CONFIGURATION SEQUENCE 85To program the configuration registers, the following sequence must be followed: 861. Enter Configuration Mode 872. Configure the Configuration Registers 883. Exit Configuration Mode. 89 90Enter Configuration Mode 91To place the chip into the Configuration State The config key (0x55) is written 92to the CONFIG PORT (0x2E). 93 94Configuration Mode 95In configuration mode, the INDEX PORT is located at the CONFIG PORT address and 96the DATA PORT is at INDEX PORT address + 1. 97 98The desired configuration registers are accessed in two steps: 99a. Write the index of the Logical Device Number Configuration Register 100 (i.e., 0x07) to the INDEX PORT and then write the number of the 101 desired logical device to the DATA PORT. 102 103b. Write the address of the desired configuration register within the 104 logical device to the INDEX PORT and then write or read the config- 105 uration register through the DATA PORT. 106 107Note: If accessing the Global Configuration Registers, step (a) is not required. 108 109Exit Configuration Mode 110To exit the Configuration State the write 0xAA to the CONFIG PORT (0x2E). 111The chip returns to the RUN State. (This is important). 112 113Programming Example 114The following is an example of how to read the SIO Device ID located at 0x20 115 116; ENTER CONFIGURATION MODE 117MOV DX,02EH 118MOV AX,055H 119OUT DX,AL 120; GLOBAL CONFIGURATION REGISTER 121MOV DX,02EH 122MOV AL,20H 123OUT DX,AL 124; READ THE DATA 125MOV DX,02FH 126IN AL,DX 127; EXIT CONFIGURATION MODE 128MOV DX,02EH 129MOV AX,0AAH 130OUT DX,AL 131 132The registers of interest for identifying the SIO on the dc7100 are Device ID 133(0x20) and Device Rev (0x21). 134 135The Device ID will read 0x6F (0x81 for SCH5307-NS, and 0x85 for SCH5317) 136The Device Rev currently reads 0x01 137 138Obtaining the HWM Base Address. 139The following is an example of how to read the HWM Base Address located in 140Logical Device 8. 141 142; ENTER CONFIGURATION MODE 143MOV DX,02EH 144MOV AX,055H 145OUT DX,AL 146; CONFIGURE REGISTER CRE0, 147; LOGICAL DEVICE 8 148MOV DX,02EH 149MOV AL,07H 150OUT DX,AL ;Point to LD# Config Reg 151MOV DX,02FH 152MOV AL, 08H 153OUT DX,AL;Point to Logical Device 8 154; 155MOV DX,02EH 156MOV AL,60H 157OUT DX,AL ; Point to HWM Base Addr MSB 158MOV DX,02FH 159IN AL,DX ; Get MSB of HWM Base Addr 160; EXIT CONFIGURATION MODE 161MOV DX,02EH 162MOV AX,0AAH 163OUT DX,AL 164