Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | November 23, 2004 |
| 2 | |
| 3 | The following specification describes the SMSC LPC47B397-NC sensor chip |
| 4 | (for which there is no public datasheet available). This document was |
| 5 | provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected |
| 6 | by Mark M. Hoffman <mhoffman@lightlink.com>. |
| 7 | |
| 8 | * * * * * |
| 9 | |
| 10 | Methods for detecting the HP SIO and reading the thermal data on a dc7100. |
| 11 | |
| 12 | The thermal information on the dc7100 is contained in the SIO Hardware Monitor |
| 13 | (HWM). The information is accessed through an index/data pair. The index/data |
| 14 | pair is located at the HWM Base Address + 0 and the HWM Base Address + 1. The |
| 15 | HWM Base address can be obtained from Logical Device 8, registers 0x60 (MSB) |
| 16 | and 0x61 (LSB). Currently we are using 0x480 for the HWM Base Address and |
| 17 | 0x480 and 0x481 for the index/data pair. |
| 18 | |
| 19 | Reading temperature information. |
| 20 | The temperature information is located in the following registers: |
| 21 | Temp1 0x25 (Currently, this reflects the CPU temp on all systems). |
| 22 | Temp2 0x26 |
| 23 | Temp3 0x27 |
| 24 | Temp4 0x80 |
| 25 | |
| 26 | Programming Example |
| 27 | The following is an example of how to read the HWM temperature registers: |
| 28 | MOV DX,480H |
| 29 | MOV AX,25H |
| 30 | OUT DX,AL |
| 31 | MOV DX,481H |
| 32 | IN AL,DX |
| 33 | |
| 34 | AL contains the data in hex, the temperature in Celsius is the decimal |
| 35 | equivalent. |
| 36 | |
| 37 | Ex: If AL contains 0x2A, the temperature is 42 degrees C. |
| 38 | |
| 39 | Reading tach information. |
| 40 | The fan speed information is located in the following registers: |
| 41 | LSB MSB |
| 42 | Tach1 0x28 0x29 (Currently, this reflects the CPU |
| 43 | fan speed on all systems). |
| 44 | Tach2 0x2A 0x2B |
| 45 | Tach3 0x2C 0x2D |
| 46 | Tach4 0x2E 0x2F |
| 47 | |
| 48 | Important!!! |
| 49 | Reading the tach LSB locks the tach MSB. |
| 50 | The LSB Must be read first. |
| 51 | |
| 52 | How to convert the tach reading to RPM. |
| 53 | The tach reading (TCount) is given by: (Tach MSB * 256) + (Tach LSB) |
| 54 | The SIO counts the number of 90kHz (11.111us) pulses per revolution. |
| 55 | RPM = 60/(TCount * 11.111us) |
| 56 | |
| 57 | Example: |
| 58 | Reg 0x28 = 0x9B |
| 59 | Reg 0x29 = 0x08 |
| 60 | |
| 61 | TCount = 0x89B = 2203 |
| 62 | |
| 63 | RPM = 60 / (2203 * 11.11111 E-6) = 2451 RPM |
| 64 | |
| 65 | Obtaining the SIO version. |
| 66 | |
| 67 | CONFIGURATION SEQUENCE |
| 68 | To program the configuration registers, the following sequence must be followed: |
| 69 | 1. Enter Configuration Mode |
| 70 | 2. Configure the Configuration Registers |
| 71 | 3. Exit Configuration Mode. |
| 72 | |
| 73 | Enter Configuration Mode |
| 74 | To place the chip into the Configuration State The config key (0x55) is written |
R.Marek@sh.cvut.cz | 2bf34a1 | 2005-05-26 12:42:11 +0000 | [diff] [blame^] | 75 | to the CONFIG PORT (0x2E). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | Configuration Mode |
| 78 | In configuration mode, the INDEX PORT is located at the CONFIG PORT address and |
| 79 | the DATA PORT is at INDEX PORT address + 1. |
| 80 | |
R.Marek@sh.cvut.cz | 2bf34a1 | 2005-05-26 12:42:11 +0000 | [diff] [blame^] | 81 | The desired configuration registers are accessed in two steps: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | a. Write the index of the Logical Device Number Configuration Register |
| 83 | (i.e., 0x07) to the INDEX PORT and then write the number of the |
| 84 | desired logical device to the DATA PORT. |
| 85 | |
| 86 | b. Write the address of the desired configuration register within the |
| 87 | logical device to the INDEX PORT and then write or read the config- |
R.Marek@sh.cvut.cz | 2bf34a1 | 2005-05-26 12:42:11 +0000 | [diff] [blame^] | 88 | uration register through the DATA PORT. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | Note: If accessing the Global Configuration Registers, step (a) is not required. |
| 91 | |
| 92 | Exit Configuration Mode |
| 93 | To exit the Configuration State the write 0xAA to the CONFIG PORT (0x2E). |
| 94 | The chip returns to the RUN State. (This is important). |
| 95 | |
| 96 | Programming Example |
| 97 | The following is an example of how to read the SIO Device ID located at 0x20 |
| 98 | |
R.Marek@sh.cvut.cz | 2bf34a1 | 2005-05-26 12:42:11 +0000 | [diff] [blame^] | 99 | ; ENTER CONFIGURATION MODE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | MOV DX,02EH |
| 101 | MOV AX,055H |
| 102 | OUT DX,AL |
R.Marek@sh.cvut.cz | 2bf34a1 | 2005-05-26 12:42:11 +0000 | [diff] [blame^] | 103 | ; GLOBAL CONFIGURATION REGISTER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | MOV DX,02EH |
| 105 | MOV AL,20H |
R.Marek@sh.cvut.cz | 2bf34a1 | 2005-05-26 12:42:11 +0000 | [diff] [blame^] | 106 | OUT DX,AL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | ; READ THE DATA |
| 108 | MOV DX,02FH |
| 109 | IN AL,DX |
R.Marek@sh.cvut.cz | 2bf34a1 | 2005-05-26 12:42:11 +0000 | [diff] [blame^] | 110 | ; EXIT CONFIGURATION MODE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | MOV DX,02EH |
| 112 | MOV AX,0AAH |
| 113 | OUT DX,AL |
| 114 | |
| 115 | The registers of interest for identifying the SIO on the dc7100 are Device ID |
| 116 | (0x20) and Device Rev (0x21). |
| 117 | |
| 118 | The Device ID will read 0X6F |
| 119 | The Device Rev currently reads 0x01 |
| 120 | |
| 121 | Obtaining the HWM Base Address. |
| 122 | The following is an example of how to read the HWM Base Address located in |
| 123 | Logical Device 8. |
| 124 | |
R.Marek@sh.cvut.cz | 2bf34a1 | 2005-05-26 12:42:11 +0000 | [diff] [blame^] | 125 | ; ENTER CONFIGURATION MODE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | MOV DX,02EH |
| 127 | MOV AX,055H |
| 128 | OUT DX,AL |
R.Marek@sh.cvut.cz | 2bf34a1 | 2005-05-26 12:42:11 +0000 | [diff] [blame^] | 129 | ; CONFIGURE REGISTER CRE0, |
| 130 | ; LOGICAL DEVICE 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | MOV DX,02EH |
| 132 | MOV AL,07H |
| 133 | OUT DX,AL ;Point to LD# Config Reg |
| 134 | MOV DX,02FH |
| 135 | MOV AL, 08H |
| 136 | OUT DX,AL;Point to Logical Device 8 |
| 137 | ; |
R.Marek@sh.cvut.cz | 2bf34a1 | 2005-05-26 12:42:11 +0000 | [diff] [blame^] | 138 | MOV DX,02EH |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | MOV AL,60H |
| 140 | OUT DX,AL ; Point to HWM Base Addr MSB |
| 141 | MOV DX,02FH |
| 142 | IN AL,DX ; Get MSB of HWM Base Addr |
R.Marek@sh.cvut.cz | 2bf34a1 | 2005-05-26 12:42:11 +0000 | [diff] [blame^] | 143 | ; EXIT CONFIGURATION MODE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | MOV DX,02EH |
| 145 | MOV AX,0AAH |
| 146 | OUT DX,AL |