Commit | Line | Data |
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7f15b664 M |
1 | Kernel driver smsc47b397 |
2 | ======================== | |
3 | ||
4 | Supported chips: | |
5 | * SMSC LPC47B397-NC | |
7ab83a91 | 6 | * SMSC SCH5307-NS |
2dbbdb35 | 7 | * SMSC SCH5317 |
7f15b664 M |
8 | Prefix: 'smsc47b397' |
9 | Addresses scanned: none, address read from Super I/O config space | |
10 | Datasheet: In this file | |
11 | ||
12 | Authors: Mark M. Hoffman <mhoffman@lightlink.com> | |
13 | Utilitek Systems, Inc. | |
14 | ||
1da177e4 LT |
15 | November 23, 2004 |
16 | ||
7ab83a91 | 17 | The following specification describes the SMSC LPC47B397-NC[1] sensor chip |
7f15b664 | 18 | (for which there is no public datasheet available). This document was |
1da177e4 LT |
19 | provided by Craig Kelly (In-Store Broadcast Network) and edited/corrected |
20 | by Mark M. Hoffman <mhoffman@lightlink.com>. | |
21 | ||
2dbbdb35 JH |
22 | [1] And SMSC SCH5307-NS and SCH5317, which have different device IDs but are |
23 | otherwise compatible. | |
7ab83a91 | 24 | |
1da177e4 LT |
25 | * * * * * |
26 | ||
27 | Methods for detecting the HP SIO and reading the thermal data on a dc7100. | |
28 | ||
29 | The thermal information on the dc7100 is contained in the SIO Hardware Monitor | |
7f15b664 M |
30 | (HWM). The information is accessed through an index/data pair. The index/data |
31 | pair is located at the HWM Base Address + 0 and the HWM Base Address + 1. The | |
1da177e4 | 32 | HWM Base address can be obtained from Logical Device 8, registers 0x60 (MSB) |
7f15b664 | 33 | and 0x61 (LSB). Currently we are using 0x480 for the HWM Base Address and |
1da177e4 LT |
34 | 0x480 and 0x481 for the index/data pair. |
35 | ||
36 | Reading temperature information. | |
37 | The temperature information is located in the following registers: | |
38 | Temp1 0x25 (Currently, this reflects the CPU temp on all systems). | |
39 | Temp2 0x26 | |
40 | Temp3 0x27 | |
41 | Temp4 0x80 | |
42 | ||
43 | Programming Example | |
44 | The following is an example of how to read the HWM temperature registers: | |
45 | MOV DX,480H | |
46 | MOV AX,25H | |
47 | OUT DX,AL | |
48 | MOV DX,481H | |
49 | IN AL,DX | |
50 | ||
51 | AL contains the data in hex, the temperature in Celsius is the decimal | |
52 | equivalent. | |
53 | ||
54 | Ex: If AL contains 0x2A, the temperature is 42 degrees C. | |
55 | ||
56 | Reading tach information. | |
57 | The fan speed information is located in the following registers: | |
58 | LSB MSB | |
59 | Tach1 0x28 0x29 (Currently, this reflects the CPU | |
60 | fan speed on all systems). | |
61 | Tach2 0x2A 0x2B | |
62 | Tach3 0x2C 0x2D | |
63 | Tach4 0x2E 0x2F | |
64 | ||
65 | Important!!! | |
66 | Reading the tach LSB locks the tach MSB. | |
67 | The LSB Must be read first. | |
68 | ||
69 | How to convert the tach reading to RPM. | |
7f15b664 | 70 | The tach reading (TCount) is given by: (Tach MSB * 256) + (Tach LSB) |
1da177e4 LT |
71 | The SIO counts the number of 90kHz (11.111us) pulses per revolution. |
72 | RPM = 60/(TCount * 11.111us) | |
73 | ||
74 | Example: | |
75 | Reg 0x28 = 0x9B | |
76 | Reg 0x29 = 0x08 | |
77 | ||
78 | TCount = 0x89B = 2203 | |
79 | ||
80 | RPM = 60 / (2203 * 11.11111 E-6) = 2451 RPM | |
81 | ||
82 | Obtaining the SIO version. | |
83 | ||
84 | CONFIGURATION SEQUENCE | |
85 | To program the configuration registers, the following sequence must be followed: | |
86 | 1. Enter Configuration Mode | |
87 | 2. Configure the Configuration Registers | |
88 | 3. Exit Configuration Mode. | |
89 | ||
90 | Enter Configuration Mode | |
91 | To place the chip into the Configuration State The config key (0x55) is written | |
2bf34a1c | 92 | to the CONFIG PORT (0x2E). |
1da177e4 LT |
93 | |
94 | Configuration Mode | |
95 | In configuration mode, the INDEX PORT is located at the CONFIG PORT address and | |
96 | the DATA PORT is at INDEX PORT address + 1. | |
97 | ||
2bf34a1c | 98 | The desired configuration registers are accessed in two steps: |
1da177e4 LT |
99 | a. Write the index of the Logical Device Number Configuration Register |
100 | (i.e., 0x07) to the INDEX PORT and then write the number of the | |
101 | desired logical device to the DATA PORT. | |
102 | ||
103 | b. Write the address of the desired configuration register within the | |
104 | logical device to the INDEX PORT and then write or read the config- | |
2bf34a1c | 105 | uration register through the DATA PORT. |
1da177e4 LT |
106 | |
107 | Note: If accessing the Global Configuration Registers, step (a) is not required. | |
108 | ||
109 | Exit Configuration Mode | |
110 | To exit the Configuration State the write 0xAA to the CONFIG PORT (0x2E). | |
111 | The chip returns to the RUN State. (This is important). | |
112 | ||
113 | Programming Example | |
114 | The following is an example of how to read the SIO Device ID located at 0x20 | |
115 | ||
2bf34a1c | 116 | ; ENTER CONFIGURATION MODE |
1da177e4 LT |
117 | MOV DX,02EH |
118 | MOV AX,055H | |
119 | OUT DX,AL | |
2bf34a1c | 120 | ; GLOBAL CONFIGURATION REGISTER |
1da177e4 LT |
121 | MOV DX,02EH |
122 | MOV AL,20H | |
2bf34a1c | 123 | OUT DX,AL |
1da177e4 LT |
124 | ; READ THE DATA |
125 | MOV DX,02FH | |
126 | IN AL,DX | |
2bf34a1c | 127 | ; EXIT CONFIGURATION MODE |
1da177e4 LT |
128 | MOV DX,02EH |
129 | MOV AX,0AAH | |
130 | OUT DX,AL | |
131 | ||
132 | The registers of interest for identifying the SIO on the dc7100 are Device ID | |
133 | (0x20) and Device Rev (0x21). | |
134 | ||
2dbbdb35 | 135 | The Device ID will read 0x6F (0x81 for SCH5307-NS, and 0x85 for SCH5317) |
1da177e4 LT |
136 | The Device Rev currently reads 0x01 |
137 | ||
138 | Obtaining the HWM Base Address. | |
139 | The following is an example of how to read the HWM Base Address located in | |
140 | Logical Device 8. | |
141 | ||
2bf34a1c | 142 | ; ENTER CONFIGURATION MODE |
1da177e4 LT |
143 | MOV DX,02EH |
144 | MOV AX,055H | |
145 | OUT DX,AL | |
2bf34a1c M |
146 | ; CONFIGURE REGISTER CRE0, |
147 | ; LOGICAL DEVICE 8 | |
1da177e4 LT |
148 | MOV DX,02EH |
149 | MOV AL,07H | |
150 | OUT DX,AL ;Point to LD# Config Reg | |
151 | MOV DX,02FH | |
152 | MOV AL, 08H | |
153 | OUT DX,AL;Point to Logical Device 8 | |
154 | ; | |
2bf34a1c | 155 | MOV DX,02EH |
1da177e4 LT |
156 | MOV AL,60H |
157 | OUT DX,AL ; Point to HWM Base Addr MSB | |
158 | MOV DX,02FH | |
159 | IN AL,DX ; Get MSB of HWM Base Addr | |
2bf34a1c | 160 | ; EXIT CONFIGURATION MODE |
1da177e4 LT |
161 | MOV DX,02EH |
162 | MOV AX,0AAH | |
163 | OUT DX,AL |