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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 | |
7ab83a91 | 6 | * SMSC SCH5307-NS |
7f15b664 RM |
7 | Prefix: 'smsc47b397' |
8 | Addresses scanned: none, address read from Super I/O config space | |
9 | Datasheet: In this file | |
10 | ||
11 | Authors: Mark M. Hoffman <mhoffman@lightlink.com> | |
12 | Utilitek Systems, Inc. | |
13 | ||
1da177e4 LT |
14 | November 23, 2004 |
15 | ||
7ab83a91 | 16 | The following specification describes the SMSC LPC47B397-NC[1] sensor chip |
7f15b664 | 17 | (for which there is no public datasheet available). This document was |
1da177e4 LT |
18 | provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected |
19 | by Mark M. Hoffman <mhoffman@lightlink.com>. | |
20 | ||
7ab83a91 MH |
21 | [1] And SMSC SCH5307-NS, which has a different device ID but is otherwise |
22 | compatible. | |
23 | ||
1da177e4 LT |
24 | * * * * * |
25 | ||
26 | Methods for detecting the HP SIO and reading the thermal data on a dc7100. | |
27 | ||
28 | The thermal information on the dc7100 is contained in the SIO Hardware Monitor | |
7f15b664 RM |
29 | (HWM). The information is accessed through an index/data pair. The index/data |
30 | pair is located at the HWM Base Address + 0 and the HWM Base Address + 1. The | |
1da177e4 | 31 | HWM Base address can be obtained from Logical Device 8, registers 0x60 (MSB) |
7f15b664 | 32 | and 0x61 (LSB). Currently we are using 0x480 for the HWM Base Address and |
1da177e4 LT |
33 | 0x480 and 0x481 for the index/data pair. |
34 | ||
35 | Reading temperature information. | |
36 | The temperature information is located in the following registers: | |
37 | Temp1 0x25 (Currently, this reflects the CPU temp on all systems). | |
38 | Temp2 0x26 | |
39 | Temp3 0x27 | |
40 | Temp4 0x80 | |
41 | ||
42 | Programming Example | |
43 | The following is an example of how to read the HWM temperature registers: | |
44 | MOV DX,480H | |
45 | MOV AX,25H | |
46 | OUT DX,AL | |
47 | MOV DX,481H | |
48 | IN AL,DX | |
49 | ||
50 | AL contains the data in hex, the temperature in Celsius is the decimal | |
51 | equivalent. | |
52 | ||
53 | Ex: If AL contains 0x2A, the temperature is 42 degrees C. | |
54 | ||
55 | Reading tach information. | |
56 | The fan speed information is located in the following registers: | |
57 | LSB MSB | |
58 | Tach1 0x28 0x29 (Currently, this reflects the CPU | |
59 | fan speed on all systems). | |
60 | Tach2 0x2A 0x2B | |
61 | Tach3 0x2C 0x2D | |
62 | Tach4 0x2E 0x2F | |
63 | ||
64 | Important!!! | |
65 | Reading the tach LSB locks the tach MSB. | |
66 | The LSB Must be read first. | |
67 | ||
68 | How to convert the tach reading to RPM. | |
7f15b664 | 69 | The tach reading (TCount) is given by: (Tach MSB * 256) + (Tach LSB) |
1da177e4 LT |
70 | The SIO counts the number of 90kHz (11.111us) pulses per revolution. |
71 | RPM = 60/(TCount * 11.111us) | |
72 | ||
73 | Example: | |
74 | Reg 0x28 = 0x9B | |
75 | Reg 0x29 = 0x08 | |
76 | ||
77 | TCount = 0x89B = 2203 | |
78 | ||
79 | RPM = 60 / (2203 * 11.11111 E-6) = 2451 RPM | |
80 | ||
81 | Obtaining the SIO version. | |
82 | ||
83 | CONFIGURATION SEQUENCE | |
84 | To program the configuration registers, the following sequence must be followed: | |
85 | 1. Enter Configuration Mode | |
86 | 2. Configure the Configuration Registers | |
87 | 3. Exit Configuration Mode. | |
88 | ||
89 | Enter Configuration Mode | |
90 | To place the chip into the Configuration State The config key (0x55) is written | |
2bf34a1c | 91 | to the CONFIG PORT (0x2E). |
1da177e4 LT |
92 | |
93 | Configuration Mode | |
94 | In configuration mode, the INDEX PORT is located at the CONFIG PORT address and | |
95 | the DATA PORT is at INDEX PORT address + 1. | |
96 | ||
2bf34a1c | 97 | The desired configuration registers are accessed in two steps: |
1da177e4 LT |
98 | a. Write the index of the Logical Device Number Configuration Register |
99 | (i.e., 0x07) to the INDEX PORT and then write the number of the | |
100 | desired logical device to the DATA PORT. | |
101 | ||
102 | b. Write the address of the desired configuration register within the | |
103 | logical device to the INDEX PORT and then write or read the config- | |
2bf34a1c | 104 | uration register through the DATA PORT. |
1da177e4 LT |
105 | |
106 | Note: If accessing the Global Configuration Registers, step (a) is not required. | |
107 | ||
108 | Exit Configuration Mode | |
109 | To exit the Configuration State the write 0xAA to the CONFIG PORT (0x2E). | |
110 | The chip returns to the RUN State. (This is important). | |
111 | ||
112 | Programming Example | |
113 | The following is an example of how to read the SIO Device ID located at 0x20 | |
114 | ||
2bf34a1c | 115 | ; ENTER CONFIGURATION MODE |
1da177e4 LT |
116 | MOV DX,02EH |
117 | MOV AX,055H | |
118 | OUT DX,AL | |
2bf34a1c | 119 | ; GLOBAL CONFIGURATION REGISTER |
1da177e4 LT |
120 | MOV DX,02EH |
121 | MOV AL,20H | |
2bf34a1c | 122 | OUT DX,AL |
1da177e4 LT |
123 | ; READ THE DATA |
124 | MOV DX,02FH | |
125 | IN AL,DX | |
2bf34a1c | 126 | ; EXIT CONFIGURATION MODE |
1da177e4 LT |
127 | MOV DX,02EH |
128 | MOV AX,0AAH | |
129 | OUT DX,AL | |
130 | ||
131 | The registers of interest for identifying the SIO on the dc7100 are Device ID | |
132 | (0x20) and Device Rev (0x21). | |
133 | ||
7ab83a91 | 134 | The Device ID will read 0x6F (for SCH5307-NS, 0x81) |
1da177e4 LT |
135 | The Device Rev currently reads 0x01 |
136 | ||
137 | Obtaining the HWM Base Address. | |
138 | The following is an example of how to read the HWM Base Address located in | |
139 | Logical Device 8. | |
140 | ||
2bf34a1c | 141 | ; ENTER CONFIGURATION MODE |
1da177e4 LT |
142 | MOV DX,02EH |
143 | MOV AX,055H | |
144 | OUT DX,AL | |
2bf34a1c RM |
145 | ; CONFIGURE REGISTER CRE0, |
146 | ; LOGICAL DEVICE 8 | |
1da177e4 LT |
147 | MOV DX,02EH |
148 | MOV AL,07H | |
149 | OUT DX,AL ;Point to LD# Config Reg | |
150 | MOV DX,02FH | |
151 | MOV AL, 08H | |
152 | OUT DX,AL;Point to Logical Device 8 | |
153 | ; | |
2bf34a1c | 154 | MOV DX,02EH |
1da177e4 LT |
155 | MOV AL,60H |
156 | OUT DX,AL ; Point to HWM Base Addr MSB | |
157 | MOV DX,02FH | |
158 | IN AL,DX ; Get MSB of HWM Base Addr | |
2bf34a1c | 159 | ; EXIT CONFIGURATION MODE |
1da177e4 LT |
160 | MOV DX,02EH |
161 | MOV AX,0AAH | |
162 | OUT DX,AL |