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1Kernel driver smsc47b3972========================3 4Supported chips:5 6 * SMSC LPC47B397-NC7 8 * SMSC SCH5307-NS9 10 * SMSC SCH531711 12 Prefix: 'smsc47b397'13 14 Addresses scanned: none, address read from Super I/O config space15 16 Datasheet: In this file17 18Authors:19 20 - Mark M. Hoffman <mhoffman@lightlink.com>21 - Utilitek Systems, Inc.22 23November 23, 200424 25The following specification describes the SMSC LPC47B397-NC [1]_ sensor chip26(for which there is no public datasheet available). This document was27provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected28by Mark M. Hoffman <mhoffman@lightlink.com>.29 30.. [1] And SMSC SCH5307-NS and SCH5317, which have different device IDs but are31 otherwise compatible.32 33-------------------------------------------------------------------------34 35Methods for detecting the HP SIO and reading the thermal data on a dc710036-------------------------------------------------------------------------37 38The thermal information on the dc7100 is contained in the SIO Hardware Monitor39(HWM). The information is accessed through an index/data pair. The index/data40pair is located at the HWM Base Address + 0 and the HWM Base Address + 1. The41HWM 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 and430x480 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 0x2651Temp3 0x2752Temp4 0x8053=============== ======= =======================================================54 55Programming Example56The following is an example of how to read the HWM temperature registers::57 58 MOV DX,480H59 MOV AX,25H60 OUT DX,AL61 MOV DX,481H62 IN AL,DX63 64AL contains the data in hex, the temperature in Celsius is the decimal65equivalent.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 MSB74Tach1 0x28 0x29 (Currently, this reflects the CPU75 fan speed on all systems).76Tach2 0x2A 0x2B77Tach3 0x2C 0x2D78Tach4 0x2E 0x2F79=============== ======= ======= =================================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 RPM87--------------------------------------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 = 0x9B96 Reg 0x29 = 0x0897 98TCount = 0x89B = 220399 100RPM = 60 / (2203 * 11.11111 E-6) = 2451 RPM101 102Obtaining the SIO version.103 104Configuration Sequence105----------------------106 107To program the configuration registers, the following sequence must be followed:1081. Enter Configuration Mode1092. Configure the Configuration Registers1103. Exit Configuration Mode.111 112Enter Configuration Mode113^^^^^^^^^^^^^^^^^^^^^^^^114 115To place the chip into the Configuration State The config key (0x55) is written116to the CONFIG PORT (0x2E).117 118Configuration Mode119^^^^^^^^^^^^^^^^^^120 121In configuration mode, the INDEX PORT is located at the CONFIG PORT address and122the 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 Register127 (i.e., 0x07) to the INDEX PORT and then write the number of the128 desired logical device to the DATA PORT.129 130b. Write the address of the desired configuration register within the131 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 Mode138^^^^^^^^^^^^^^^^^^^^^^^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 Example144^^^^^^^^^^^^^^^^^^^145 146The following is an example of how to read the SIO Device ID located at 0x20:147 148 ; ENTER CONFIGURATION MODE149 MOV DX,02EH150 MOV AX,055H151 OUT DX,AL152 ; GLOBAL CONFIGURATION REGISTER153 MOV DX,02EH154 MOV AL,20H155 OUT DX,AL156 ; READ THE DATA157 MOV DX,02FH158 IN AL,DX159 ; EXIT CONFIGURATION MODE160 MOV DX,02EH161 MOV AX,0AAH162 OUT DX,AL163 164The registers of interest for identifying the SIO on the dc7100 are Device ID165(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 0x01169 170Obtaining the HWM Base Address171------------------------------172 173The following is an example of how to read the HWM Base Address located in174Logical Device 8::175 176 ; ENTER CONFIGURATION MODE177 MOV DX,02EH178 MOV AX,055H179 OUT DX,AL180 ; CONFIGURE REGISTER CRE0,181 ; LOGICAL DEVICE 8182 MOV DX,02EH183 MOV AL,07H184 OUT DX,AL ;Point to LD# Config Reg185 MOV DX,02FH186 MOV AL, 08H187 OUT DX,AL;Point to Logical Device 8188 ;189 MOV DX,02EH190 MOV AL,60H191 OUT DX,AL ; Point to HWM Base Addr MSB192 MOV DX,02FH193 IN AL,DX ; Get MSB of HWM Base Addr194 ; EXIT CONFIGURATION MODE195 MOV DX,02EH196 MOV AX,0AAH197 OUT DX,AL198