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Commit | Line | Data |
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7f15b664 RM |
1 | Kernel driver smsc47b397 |
2 | ======================== | |
3 | ||
4 | Supported chips: | |
5 | * SMSC LPC47B397-NC | |
6 | Prefix: 'smsc47b397' | |
7 | Addresses scanned: none, address read from Super I/O config space | |
8 | Datasheet: In this file | |
9 | ||
10 | Authors: Mark M. Hoffman <mhoffman@lightlink.com> | |
11 | Utilitek Systems, Inc. | |
12 | ||
1da177e4 LT |
13 | November 23, 2004 |
14 | ||
15 | The following specification describes the SMSC LPC47B397-NC sensor chip | |
7f15b664 | 16 | (for which there is no public datasheet available). This document was |
1da177e4 LT |
17 | provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected |
18 | by Mark M. Hoffman <mhoffman@lightlink.com>. | |
19 | ||
20 | * * * * * | |
21 | ||
22 | Methods for detecting the HP SIO and reading the thermal data on a dc7100. | |
23 | ||
24 | The thermal information on the dc7100 is contained in the SIO Hardware Monitor | |
7f15b664 RM |
25 | (HWM). The information is accessed through an index/data pair. The index/data |
26 | pair is located at the HWM Base Address + 0 and the HWM Base Address + 1. The | |
1da177e4 | 27 | HWM Base address can be obtained from Logical Device 8, registers 0x60 (MSB) |
7f15b664 | 28 | and 0x61 (LSB). Currently we are using 0x480 for the HWM Base Address and |
1da177e4 LT |
29 | 0x480 and 0x481 for the index/data pair. |
30 | ||
31 | Reading temperature information. | |
32 | The temperature information is located in the following registers: | |
33 | Temp1 0x25 (Currently, this reflects the CPU temp on all systems). | |
34 | Temp2 0x26 | |
35 | Temp3 0x27 | |
36 | Temp4 0x80 | |
37 | ||
38 | Programming Example | |
39 | The following is an example of how to read the HWM temperature registers: | |
40 | MOV DX,480H | |
41 | MOV AX,25H | |
42 | OUT DX,AL | |
43 | MOV DX,481H | |
44 | IN AL,DX | |
45 | ||
46 | AL contains the data in hex, the temperature in Celsius is the decimal | |
47 | equivalent. | |
48 | ||
49 | Ex: If AL contains 0x2A, the temperature is 42 degrees C. | |
50 | ||
51 | Reading tach information. | |
52 | The fan speed information is located in the following registers: | |
53 | LSB MSB | |
54 | Tach1 0x28 0x29 (Currently, this reflects the CPU | |
55 | fan speed on all systems). | |
56 | Tach2 0x2A 0x2B | |
57 | Tach3 0x2C 0x2D | |
58 | Tach4 0x2E 0x2F | |
59 | ||
60 | Important!!! | |
61 | Reading the tach LSB locks the tach MSB. | |
62 | The LSB Must be read first. | |
63 | ||
64 | How to convert the tach reading to RPM. | |
7f15b664 | 65 | The tach reading (TCount) is given by: (Tach MSB * 256) + (Tach LSB) |
1da177e4 LT |
66 | The SIO counts the number of 90kHz (11.111us) pulses per revolution. |
67 | RPM = 60/(TCount * 11.111us) | |
68 | ||
69 | Example: | |
70 | Reg 0x28 = 0x9B | |
71 | Reg 0x29 = 0x08 | |
72 | ||
73 | TCount = 0x89B = 2203 | |
74 | ||
75 | RPM = 60 / (2203 * 11.11111 E-6) = 2451 RPM | |
76 | ||
77 | Obtaining the SIO version. | |
78 | ||
79 | CONFIGURATION SEQUENCE | |
80 | To program the configuration registers, the following sequence must be followed: | |
81 | 1. Enter Configuration Mode | |
82 | 2. Configure the Configuration Registers | |
83 | 3. Exit Configuration Mode. | |
84 | ||
85 | Enter Configuration Mode | |
86 | To place the chip into the Configuration State The config key (0x55) is written | |
2bf34a1c | 87 | to the CONFIG PORT (0x2E). |
1da177e4 LT |
88 | |
89 | Configuration Mode | |
90 | In configuration mode, the INDEX PORT is located at the CONFIG PORT address and | |
91 | the DATA PORT is at INDEX PORT address + 1. | |
92 | ||
2bf34a1c | 93 | The desired configuration registers are accessed in two steps: |
1da177e4 LT |
94 | a. Write the index of the Logical Device Number Configuration Register |
95 | (i.e., 0x07) to the INDEX PORT and then write the number of the | |
96 | desired logical device to the DATA PORT. | |
97 | ||
98 | b. Write the address of the desired configuration register within the | |
99 | logical device to the INDEX PORT and then write or read the config- | |
2bf34a1c | 100 | uration register through the DATA PORT. |
1da177e4 LT |
101 | |
102 | Note: If accessing the Global Configuration Registers, step (a) is not required. | |
103 | ||
104 | Exit Configuration Mode | |
105 | To exit the Configuration State the write 0xAA to the CONFIG PORT (0x2E). | |
106 | The chip returns to the RUN State. (This is important). | |
107 | ||
108 | Programming Example | |
109 | The following is an example of how to read the SIO Device ID located at 0x20 | |
110 | ||
2bf34a1c | 111 | ; ENTER CONFIGURATION MODE |
1da177e4 LT |
112 | MOV DX,02EH |
113 | MOV AX,055H | |
114 | OUT DX,AL | |
2bf34a1c | 115 | ; GLOBAL CONFIGURATION REGISTER |
1da177e4 LT |
116 | MOV DX,02EH |
117 | MOV AL,20H | |
2bf34a1c | 118 | OUT DX,AL |
1da177e4 LT |
119 | ; READ THE DATA |
120 | MOV DX,02FH | |
121 | IN AL,DX | |
2bf34a1c | 122 | ; EXIT CONFIGURATION MODE |
1da177e4 LT |
123 | MOV DX,02EH |
124 | MOV AX,0AAH | |
125 | OUT DX,AL | |
126 | ||
127 | The registers of interest for identifying the SIO on the dc7100 are Device ID | |
128 | (0x20) and Device Rev (0x21). | |
129 | ||
130 | The Device ID will read 0X6F | |
131 | The Device Rev currently reads 0x01 | |
132 | ||
133 | Obtaining the HWM Base Address. | |
134 | The following is an example of how to read the HWM Base Address located in | |
135 | Logical Device 8. | |
136 | ||
2bf34a1c | 137 | ; ENTER CONFIGURATION MODE |
1da177e4 LT |
138 | MOV DX,02EH |
139 | MOV AX,055H | |
140 | OUT DX,AL | |
2bf34a1c RM |
141 | ; CONFIGURE REGISTER CRE0, |
142 | ; LOGICAL DEVICE 8 | |
1da177e4 LT |
143 | MOV DX,02EH |
144 | MOV AL,07H | |
145 | OUT DX,AL ;Point to LD# Config Reg | |
146 | MOV DX,02FH | |
147 | MOV AL, 08H | |
148 | OUT DX,AL;Point to Logical Device 8 | |
149 | ; | |
2bf34a1c | 150 | MOV DX,02EH |
1da177e4 LT |
151 | MOV AL,60H |
152 | OUT DX,AL ; Point to HWM Base Addr MSB | |
153 | MOV DX,02FH | |
154 | IN AL,DX ; Get MSB of HWM Base Addr | |
2bf34a1c | 155 | ; EXIT CONFIGURATION MODE |
1da177e4 LT |
156 | MOV DX,02EH |
157 | MOV AX,0AAH | |
158 | OUT DX,AL |