smsc47b397.rst (5302B)
1Kernel driver smsc47b397 2======================== 3 4Supported chips: 5 6 * SMSC LPC47B397-NC 7 8 * SMSC SCH5307-NS 9 10 * SMSC SCH5317 11 12 Prefix: 'smsc47b397' 13 14 Addresses scanned: none, address read from Super I/O config space 15 16 Datasheet: In this file 17 18Authors: 19 20 - Mark M. Hoffman <mhoffman@lightlink.com> 21 - Utilitek Systems, Inc. 22 23November 23, 2004 24 25The following specification describes the SMSC LPC47B397-NC [1]_ sensor chip 26(for which there is no public datasheet available). This document was 27provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected 28by Mark M. Hoffman <mhoffman@lightlink.com>. 29 30.. [1] And SMSC SCH5307-NS and SCH5317, which have different device IDs but are 31 otherwise compatible. 32 33------------------------------------------------------------------------- 34 35Methods for detecting the HP SIO and reading the thermal data on a dc7100 36------------------------------------------------------------------------- 37 38The thermal information on the dc7100 is contained in the SIO Hardware Monitor 39(HWM). The information is accessed through an index/data pair. The index/data 40pair is located at the HWM Base Address + 0 and the HWM Base Address + 1. The 41HWM Base address can be obtained from Logical Device 8, registers 0x60 (MSB) 42and 0x61 (LSB). Currently we are using 0x480 for the HWM Base Address and 430x480 and 0x481 for the index/data pair. 44 45Reading temperature information. 46The temperature information is located in the following registers: 47 48=============== ======= ======================================================= 49Temp1 0x25 (Currently, this reflects the CPU temp on all systems). 50Temp2 0x26 51Temp3 0x27 52Temp4 0x80 53=============== ======= ======================================================= 54 55Programming Example 56The following is an example of how to read the HWM temperature registers:: 57 58 MOV DX,480H 59 MOV AX,25H 60 OUT DX,AL 61 MOV DX,481H 62 IN AL,DX 63 64AL contains the data in hex, the temperature in Celsius is the decimal 65equivalent. 66 67Ex: If AL contains 0x2A, the temperature is 42 degrees C. 68 69Reading tach information. 70The fan speed information is located in the following registers: 71 72=============== ======= ======= ================================= 73 LSB MSB 74Tach1 0x28 0x29 (Currently, this reflects the CPU 75 fan speed on all systems). 76Tach2 0x2A 0x2B 77Tach3 0x2C 0x2D 78Tach4 0x2E 0x2F 79=============== ======= ======= ================================= 80 81.. Important:: 82 83 Reading the tach LSB locks the tach MSB. 84 The LSB Must be read first. 85 86How to convert the tach reading to RPM 87-------------------------------------- 88 89The tach reading (TCount) is given by: (Tach MSB * 256) + (Tach LSB) 90The SIO counts the number of 90kHz (11.111us) pulses per revolution. 91RPM = 60/(TCount * 11.111us) 92 93Example:: 94 95 Reg 0x28 = 0x9B 96 Reg 0x29 = 0x08 97 98TCount = 0x89B = 2203 99 100RPM = 60 / (2203 * 11.11111 E-6) = 2451 RPM 101 102Obtaining the SIO version. 103 104Configuration Sequence 105---------------------- 106 107To program the configuration registers, the following sequence must be followed: 1081. Enter Configuration Mode 1092. Configure the Configuration Registers 1103. Exit Configuration Mode. 111 112Enter Configuration Mode 113^^^^^^^^^^^^^^^^^^^^^^^^ 114 115To place the chip into the Configuration State The config key (0x55) is written 116to the CONFIG PORT (0x2E). 117 118Configuration Mode 119^^^^^^^^^^^^^^^^^^ 120 121In configuration mode, the INDEX PORT is located at the CONFIG PORT address and 122the DATA PORT is at INDEX PORT address + 1. 123 124The desired configuration registers are accessed in two steps: 125 126a. Write the index of the Logical Device Number Configuration Register 127 (i.e., 0x07) to the INDEX PORT and then write the number of the 128 desired logical device to the DATA PORT. 129 130b. Write the address of the desired configuration register within the 131 logical device to the INDEX PORT and then write or read the config- 132 uration register through the DATA PORT. 133 134Note: 135 If accessing the Global Configuration Registers, step (a) is not required. 136 137Exit Configuration Mode 138^^^^^^^^^^^^^^^^^^^^^^^ 139 140To exit the Configuration State the write 0xAA to the CONFIG PORT (0x2E). 141The chip returns to the RUN State. (This is important). 142 143Programming Example 144^^^^^^^^^^^^^^^^^^^ 145 146The following is an example of how to read the SIO Device ID located at 0x20: 147 148 ; ENTER CONFIGURATION MODE 149 MOV DX,02EH 150 MOV AX,055H 151 OUT DX,AL 152 ; GLOBAL CONFIGURATION REGISTER 153 MOV DX,02EH 154 MOV AL,20H 155 OUT DX,AL 156 ; READ THE DATA 157 MOV DX,02FH 158 IN AL,DX 159 ; EXIT CONFIGURATION MODE 160 MOV DX,02EH 161 MOV AX,0AAH 162 OUT DX,AL 163 164The registers of interest for identifying the SIO on the dc7100 are Device ID 165(0x20) and Device Rev (0x21). 166 167The Device ID will read 0x6F (0x81 for SCH5307-NS, and 0x85 for SCH5317) 168The Device Rev currently reads 0x01 169 170Obtaining the HWM Base Address 171------------------------------ 172 173The following is an example of how to read the HWM Base Address located in 174Logical Device 8:: 175 176 ; ENTER CONFIGURATION MODE 177 MOV DX,02EH 178 MOV AX,055H 179 OUT DX,AL 180 ; CONFIGURE REGISTER CRE0, 181 ; LOGICAL DEVICE 8 182 MOV DX,02EH 183 MOV AL,07H 184 OUT DX,AL ;Point to LD# Config Reg 185 MOV DX,02FH 186 MOV AL, 08H 187 OUT DX,AL;Point to Logical Device 8 188 ; 189 MOV DX,02EH 190 MOV AL,60H 191 OUT DX,AL ; Point to HWM Base Addr MSB 192 MOV DX,02FH 193 IN AL,DX ; Get MSB of HWM Base Addr 194 ; EXIT CONFIGURATION MODE 195 MOV DX,02EH 196 MOV AX,0AAH 197 OUT DX,AL