Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver smsc47b397 2 ======================== 3 4 Supported 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 12 Authors: Mark M. Hoffman <mhoffman@lightlink.com> 13 Utilitek Systems, Inc. 14 15 November 23, 2004 16 17 The following specification describes the SMSC LPC47B397-NC[1] sensor chip 18 (for which there is no public datasheet available). This document was 19 provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected 20 by Mark M. Hoffman <mhoffman@lightlink.com>. 21 22 [1] And SMSC SCH5307-NS and SCH5317, which have different device IDs but are 23 otherwise compatible. 24 25 * * * * * 26 27 Methods for detecting the HP SIO and reading the thermal data on a dc7100. 28 29 The 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 31 pair is located at the HWM Base Address + 0 and the HWM Base Address + 1. The 32 HWM Base address can be obtained from Logical Device 8, registers 0x60 (MSB) 33 and 0x61 (LSB). Currently we are using 0x480 for the HWM Base Address and 34 0x480 and 0x481 for the index/data pair. 35 36 Reading temperature information. 37 The temperature information is located in the following registers: 38 Temp1 0x25 (Currently, this reflects the CPU temp on all systems). 39 Temp2 0x26 40 Temp3 0x27 41 Temp4 0x80 42 43 Programming Example 44 The following is an example of how to read the HWM temperature registers: 45 MOV DX,480H 46 MOV AX,25H 47 OUT DX,AL 48 MOV DX,481H 49 IN AL,DX 50 51 AL contains the data in hex, the temperature in Celsius is the decimal 52 equivalent. 53 54 Ex: If AL contains 0x2A, the temperature is 42 degrees C. 55 56 Reading tach information. 57 The fan speed information is located in the following registers: 58 LSB MSB 59 Tach1 0x28 0x29 (Currently, this reflects the CPU 60 fan speed on all systems). 61 Tach2 0x2A 0x2B 62 Tach3 0x2C 0x2D 63 Tach4 0x2E 0x2F 64 65 Important!!! 66 Reading the tach LSB locks the tach MSB. 67 The LSB Must be read first. 68 69 How to convert the tach reading to RPM. 70 The tach reading (TCount) is given by: (Tach MSB * 256) + (Tach LSB) 71 The SIO counts the number of 90kHz (11.111us) pulses per revolution. 72 RPM = 60/(TCount * 11.111us) 73 74 Example: 75 Reg 0x28 = 0x9B 76 Reg 0x29 = 0x08 77 78 TCount = 0x89B = 2203 79 80 RPM = 60 / (2203 * 11.11111 E-6) = 2451 RPM 81 82 Obtaining the SIO version. 83 84 CONFIGURATION SEQUENCE 85 To program the configuration registers, the following sequence must be followed: 86 1. Enter Configuration Mode 87 2. Configure the Configuration Registers 88 3. Exit Configuration Mode. 89 90 Enter Configuration Mode 91 To place the chip into the Configuration State The config key (0x55) is written 92 to the CONFIG PORT (0x2E). 93 94 Configuration Mode 95 In configuration mode, the INDEX PORT is located at the CONFIG PORT address and 96 the DATA PORT is at INDEX PORT address + 1. 97 98 The desired configuration registers are accessed in two steps: 99 a. 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. 102 103 b. 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. 106 107 Note: If accessing the Global Configuration Registers, step (a) is not required. 108 109 Exit Configuration Mode 110 To exit the Configuration State the write 0xAA to the CONFIG PORT (0x2E). 111 The chip returns to the RUN State. (This is important). 112 113 Programming Example 114 The following is an example of how to read the SIO Device ID located at 0x20 115 116 ; ENTER CONFIGURATION MODE 117 MOV DX,02EH 118 MOV AX,055H 119 OUT DX,AL 120 ; GLOBAL CONFIGURATION REGISTER 121 MOV DX,02EH 122 MOV AL,20H 123 OUT DX,AL 124 ; READ THE DATA 125 MOV DX,02FH 126 IN AL,DX 127 ; EXIT CONFIGURATION MODE 128 MOV DX,02EH 129 MOV AX,0AAH 130 OUT DX,AL 131 132 The registers of interest for identifying the SIO on the dc7100 are Device ID 133 (0x20) and Device Rev (0x21). 134 135 The Device ID will read 0x6F (0x81 for SCH5307-NS, and 0x85 for SCH5317) 136 The Device Rev currently reads 0x01 137 138 Obtaining the HWM Base Address. 139 The following is an example of how to read the HWM Base Address located in 140 Logical Device 8. 141 142 ; ENTER CONFIGURATION MODE 143 MOV DX,02EH 144 MOV AX,055H 145 OUT DX,AL 146 ; CONFIGURE REGISTER CRE0, 147 ; LOGICAL DEVICE 8 148 MOV DX,02EH 149 MOV AL,07H 150 OUT DX,AL ;Point to LD# Config Reg 151 MOV DX,02FH 152 MOV AL, 08H 153 OUT DX,AL;Point to Logical Device 8 154 ; 155 MOV DX,02EH 156 MOV AL,60H 157 OUT DX,AL ; Point to HWM Base Addr MSB 158 MOV DX,02FH 159 IN AL,DX ; Get MSB of HWM Base Addr 160 ; EXIT CONFIGURATION MODE 161 MOV DX,02EH 162 MOV AX,0AAH 163 OUT DX,AL