1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
Kernel driver smsc47b397
========================
Supported chips:
* SMSC LPC47B397-NC
* SMSC SCH5307-NS
Prefix: 'smsc47b397'
Addresses scanned: none, address read from Super I/O config space
Datasheet: In this file
Authors: Mark M. Hoffman <mhoffman@lightlink.com>
Utilitek Systems, Inc.
November 23, 2004
The following specification describes the SMSC LPC47B397-NC[1] sensor chip
(for which there is no public datasheet available). This document was
provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected
by Mark M. Hoffman <mhoffman@lightlink.com>.
[1] And SMSC SCH5307-NS, which has a different device ID but is otherwise
compatible.
* * * * *
Methods for detecting the HP SIO and reading the thermal data on a dc7100.
The thermal information on the dc7100 is contained in the SIO Hardware Monitor
(HWM). The information is accessed through an index/data pair. The index/data
pair is located at the HWM Base Address + 0 and the HWM Base Address + 1. The
HWM Base address can be obtained from Logical Device 8, registers 0x60 (MSB)
and 0x61 (LSB). Currently we are using 0x480 for the HWM Base Address and
0x480 and 0x481 for the index/data pair.
Reading temperature information.
The temperature information is located in the following registers:
Temp1 0x25 (Currently, this reflects the CPU temp on all systems).
Temp2 0x26
Temp3 0x27
Temp4 0x80
Programming Example
The following is an example of how to read the HWM temperature registers:
MOV DX,480H
MOV AX,25H
OUT DX,AL
MOV DX,481H
IN AL,DX
AL contains the data in hex, the temperature in Celsius is the decimal
equivalent.
Ex: If AL contains 0x2A, the temperature is 42 degrees C.
Reading tach information.
The fan speed information is located in the following registers:
LSB MSB
Tach1 0x28 0x29 (Currently, this reflects the CPU
fan speed on all systems).
Tach2 0x2A 0x2B
Tach3 0x2C 0x2D
Tach4 0x2E 0x2F
Important!!!
Reading the tach LSB locks the tach MSB.
The LSB Must be read first.
How to convert the tach reading to RPM.
The tach reading (TCount) is given by: (Tach MSB * 256) + (Tach LSB)
The SIO counts the number of 90kHz (11.111us) pulses per revolution.
RPM = 60/(TCount * 11.111us)
Example:
Reg 0x28 = 0x9B
Reg 0x29 = 0x08
TCount = 0x89B = 2203
RPM = 60 / (2203 * 11.11111 E-6) = 2451 RPM
Obtaining the SIO version.
CONFIGURATION SEQUENCE
To program the configuration registers, the following sequence must be followed:
1. Enter Configuration Mode
2. Configure the Configuration Registers
3. Exit Configuration Mode.
Enter Configuration Mode
To place the chip into the Configuration State The config key (0x55) is written
to the CONFIG PORT (0x2E).
Configuration Mode
In configuration mode, the INDEX PORT is located at the CONFIG PORT address and
the DATA PORT is at INDEX PORT address + 1.
The desired configuration registers are accessed in two steps:
a. Write the index of the Logical Device Number Configuration Register
(i.e., 0x07) to the INDEX PORT and then write the number of the
desired logical device to the DATA PORT.
b. Write the address of the desired configuration register within the
logical device to the INDEX PORT and then write or read the config-
uration register through the DATA PORT.
Note: If accessing the Global Configuration Registers, step (a) is not required.
Exit Configuration Mode
To exit the Configuration State the write 0xAA to the CONFIG PORT (0x2E).
The chip returns to the RUN State. (This is important).
Programming Example
The following is an example of how to read the SIO Device ID located at 0x20
; ENTER CONFIGURATION MODE
MOV DX,02EH
MOV AX,055H
OUT DX,AL
; GLOBAL CONFIGURATION REGISTER
MOV DX,02EH
MOV AL,20H
OUT DX,AL
; READ THE DATA
MOV DX,02FH
IN AL,DX
; EXIT CONFIGURATION MODE
MOV DX,02EH
MOV AX,0AAH
OUT DX,AL
The registers of interest for identifying the SIO on the dc7100 are Device ID
(0x20) and Device Rev (0x21).
The Device ID will read 0x6F (for SCH5307-NS, 0x81)
The Device Rev currently reads 0x01
Obtaining the HWM Base Address.
The following is an example of how to read the HWM Base Address located in
Logical Device 8.
; ENTER CONFIGURATION MODE
MOV DX,02EH
MOV AX,055H
OUT DX,AL
; CONFIGURE REGISTER CRE0,
; LOGICAL DEVICE 8
MOV DX,02EH
MOV AL,07H
OUT DX,AL ;Point to LD# Config Reg
MOV DX,02FH
MOV AL, 08H
OUT DX,AL;Point to Logical Device 8
;
MOV DX,02EH
MOV AL,60H
OUT DX,AL ; Point to HWM Base Addr MSB
MOV DX,02FH
IN AL,DX ; Get MSB of HWM Base Addr
; EXIT CONFIGURATION MODE
MOV DX,02EH
MOV AX,0AAH
OUT DX,AL
|
