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d58de038 GJ |
1 | Kernel driver asc7621 |
2 | ================== | |
3 | ||
4 | Supported chips: | |
5 | Andigilog aSC7621 and aSC7621a | |
6 | Prefix: 'asc7621' | |
7 | Addresses scanned: I2C 0x2c, 0x2d, 0x2e | |
8 | Datasheet: http://www.fairview5.com/linux/asc7621/asc7621.pdf | |
9 | ||
10 | Author: | |
11 | George Joseph | |
12 | ||
13 | Description provided by Dave Pivin @ Andigilog: | |
14 | ||
15 | Andigilog has both the PECI and pre-PECI versions of the Heceta-6, as | |
16 | Intel calls them. Heceta-6e has high frequency PWM and Heceta-6p has | |
17 | added PECI and a 4th thermal zone. The Andigilog aSC7611 is the | |
18 | Heceta-6e part and aSC7621 is the Heceta-6p part. They are both in | |
19 | volume production, shipping to Intel and their subs. | |
20 | ||
21 | We have enhanced both parts relative to the governing Intel | |
22 | specification. First enhancement is temperature reading resolution. We | |
23 | have used registers below 20h for vendor-specific functions in addition | |
24 | to those in the Intel-specified vendor range. | |
25 | ||
26 | Our conversion process produces a result that is reported as two bytes. | |
27 | The fan speed control uses this finer value to produce a "step-less" fan | |
28 | PWM output. These two bytes are "read-locked" to guarantee that once a | |
29 | high or low byte is read, the other byte is locked-in until after the | |
30 | next read of any register. So to get an atomic reading, read high or low | |
31 | byte, then the very next read should be the opposite byte. Our data | |
32 | sheet says 10-bits of resolution, although you may find the lower bits | |
33 | are active, they are not necessarily reliable or useful externally. We | |
34 | chose not to mask them. | |
35 | ||
36 | We employ significant filtering that is user tunable as described in the | |
37 | data sheet. Our temperature reports and fan PWM outputs are very smooth | |
38 | when compared to the competition, in addition to the higher resolution | |
39 | temperature reports. The smoother PWM output does not require user | |
40 | intervention. | |
41 | ||
42 | We offer GPIO features on the former VID pins. These are open-drain | |
43 | outputs or inputs and may be used as general purpose I/O or as alarm | |
44 | outputs that are based on temperature limits. These are in 19h and 1Ah. | |
45 | ||
46 | We offer flexible mapping of temperature readings to thermal zones. Any | |
47 | temperature may be mapped to any zone, which has a default assignment | |
48 | that follows Intel's specs. | |
49 | ||
50 | Since there is a fan to zone assignment that allows for the "hotter" of | |
51 | a set of zones to control the PWM of an individual fan, but there is no | |
52 | indication to the user, we have added an indicator that shows which zone | |
53 | is currently controlling the PWM for a given fan. This is in register | |
54 | 00h. | |
55 | ||
56 | Both remote diode temperature readings may be given an offset value such | |
57 | that the reported reading as well as the temperature used to determine | |
58 | PWM may be offset for system calibration purposes. | |
59 | ||
60 | PECI Extended configuration allows for having more than two domains per | |
61 | PECI address and also provides an enabling function for each PECI | |
62 | address. One could use our flexible zone assignment to have a zone | |
63 | assigned to up to 4 PECI addresses. This is not possible in the default | |
64 | Intel configuration. This would be useful in multi-CPU systems with | |
65 | individual fans on each that would benefit from individual fan control. | |
66 | This is in register 0Eh. | |
67 | ||
68 | The tachometer measurement system is flexible and able to adapt to many | |
69 | fan types. We can also support pulse-stretched PWM so that 3-wire fans | |
70 | may be used. These characteristics are in registers 04h to 07h. | |
71 | ||
72 | Finally, we have added a tach disable function that turns off the tach | |
73 | measurement system for individual tachs in order to save power. That is | |
74 | in register 75h. | |
75 | ||
76 | -- | |
77 | aSC7621 Product Description | |
78 | ||
79 | The aSC7621 has a two wire digital interface compatible with SMBus 2.0. | |
80 | Using a 10-bit ADC, the aSC7621 measures the temperature of two remote diode | |
81 | connected transistors as well as its own die. Support for Platform | |
82 | Environmental Control Interface (PECI) is included. | |
83 | ||
84 | Using temperature information from these four zones, an automatic fan speed | |
85 | control algorithm is employed to minimize acoustic impact while achieving | |
86 | recommended CPU temperature under varying operational loads. | |
87 | ||
88 | To set fan speed, the aSC7621 has three independent pulse width modulation | |
89 | (PWM) outputs that are controlled by one, or a combination of three, | |
90 | temperature zones. Both high- and low-frequency PWM ranges are supported. | |
91 | ||
92 | The aSC7621 also includes a digital filter that can be invoked to smooth | |
93 | temperature readings for better control of fan speed and minimum acoustic | |
94 | impact. | |
95 | ||
96 | The aSC7621 has tachometer inputs to measure fan speed on up to four fans. | |
97 | Limit and status registers for all measured values are included to alert | |
98 | the system host that any measurements are outside of programmed limits | |
99 | via status registers. | |
100 | ||
101 | System voltages of VCCP, 2.5V, 3.3V, 5.0V, and 12V motherboard power are | |
102 | monitored efficiently with internal scaling resistors. | |
103 | ||
104 | Features | |
105 | - Supports PECI interface and monitors internal and remote thermal diodes | |
106 | - 2-wire, SMBus 2.0 compliant, serial interface | |
107 | - 10-bit ADC | |
108 | - Monitors VCCP, 2.5V, 3.3V, 5.0V, and 12V motherboard/processor supplies | |
109 | - Programmable autonomous fan control based on temperature readings | |
110 | - Noise filtering of temperature reading for fan speed control | |
111 | - 0.25C digital temperature sensor resolution | |
112 | - 3 PWM fan speed control outputs for 2-, 3- or 4-wire fans and up to 4 fan | |
113 | tachometer inputs | |
114 | - Enhanced measured temperature to Temperature Zone assignment. | |
115 | - Provides high and low PWM frequency ranges | |
116 | - 3 GPIO pins for custom use | |
117 | - 24-Lead QSOP package | |
118 | ||
119 | Configuration Notes | |
120 | =================== | |
121 | ||
122 | Except where noted below, the sysfs entries created by this driver follow | |
123 | the standards defined in "sysfs-interface". | |
124 | ||
125 | temp1_source | |
126 | 0 (default) peci_legacy = 0, Remote 1 Temperature | |
127 | peci_legacy = 1, PECI Processor Temperature 0 | |
128 | 1 Remote 1 Temperature | |
129 | 2 Remote 2 Temperature | |
130 | 3 Internal Temperature | |
131 | 4 PECI Processor Temperature 0 | |
132 | 5 PECI Processor Temperature 1 | |
133 | 6 PECI Processor Temperature 2 | |
134 | 7 PECI Processor Temperature 3 | |
135 | ||
136 | temp2_source | |
137 | 0 (default) Internal Temperature | |
138 | 1 Remote 1 Temperature | |
139 | 2 Remote 2 Temperature | |
140 | 3 Internal Temperature | |
141 | 4 PECI Processor Temperature 0 | |
142 | 5 PECI Processor Temperature 1 | |
143 | 6 PECI Processor Temperature 2 | |
144 | 7 PECI Processor Temperature 3 | |
145 | ||
146 | temp3_source | |
147 | 0 (default) Remote 2 Temperature | |
148 | 1 Remote 1 Temperature | |
149 | 2 Remote 2 Temperature | |
150 | 3 Internal Temperature | |
151 | 4 PECI Processor Temperature 0 | |
152 | 5 PECI Processor Temperature 1 | |
153 | 6 PECI Processor Temperature 2 | |
154 | 7 PECI Processor Temperature 3 | |
155 | ||
156 | temp4_source | |
157 | 0 (default) peci_legacy = 0, PECI Processor Temperature 0 | |
158 | peci_legacy = 1, Remote 1 Temperature | |
159 | 1 Remote 1 Temperature | |
160 | 2 Remote 2 Temperature | |
161 | 3 Internal Temperature | |
162 | 4 PECI Processor Temperature 0 | |
163 | 5 PECI Processor Temperature 1 | |
164 | 6 PECI Processor Temperature 2 | |
165 | 7 PECI Processor Temperature 3 | |
166 | ||
167 | temp[1-4]_smoothing_enable | |
168 | temp[1-4]_smoothing_time | |
169 | Smooths spikes in temp readings caused by noise. | |
170 | Valid values in milliseconds are: | |
171 | 35000 | |
172 | 17600 | |
173 | 11800 | |
174 | 7000 | |
175 | 4400 | |
176 | 3000 | |
177 | 1600 | |
178 | 800 | |
179 | ||
180 | temp[1-4]_crit | |
181 | When the corresponding zone temperature reaches this value, | |
182 | ALL pwm outputs will got to 100%. | |
183 | ||
184 | temp[5-8]_input | |
185 | temp[5-8]_enable | |
186 | The aSC7621 can also read temperatures provided by the processor | |
187 | via the PECI bus. Usually these are "core" temps and are relative | |
188 | to the point where the automatic thermal control circuit starts | |
189 | throttling. This means that these are usually negative numbers. | |
190 | ||
191 | pwm[1-3]_enable | |
192 | 0 Fan off. | |
193 | 1 Fan on manual control. | |
194 | 2 Fan on automatic control and will run at the minimum pwm | |
195 | if the temperature for the zone is below the minimum. | |
196 | 3 Fan on automatic control but will be off if the temperature | |
197 | for the zone is below the minimum. | |
198 | 4-254 Ignored. | |
199 | 255 Fan on full. | |
200 | ||
201 | pwm[1-3]_auto_channels | |
202 | Bitmap as described in sysctl-interface with the following | |
203 | exceptions... | |
204 | Only the following combination of zones (and their corresponding masks) | |
205 | are valid: | |
206 | 1 | |
207 | 2 | |
208 | 3 | |
209 | 2,3 | |
210 | 1,2,3 | |
211 | 4 | |
212 | 1,2,3,4 | |
213 | ||
214 | Special values: | |
215 | 0 Disabled. | |
216 | 16 Fan on manual control. | |
217 | 31 Fan on full. | |
218 | ||
219 | ||
220 | pwm[1-3]_invert | |
221 | When set, inverts the meaning of pwm[1-3]. | |
222 | i.e. when pwm = 0, the fan will be on full and | |
223 | when pwm = 255 the fan will be off. | |
224 | ||
225 | pwm[1-3]_freq | |
226 | PWM frequency in Hz | |
227 | Valid values in Hz are: | |
228 | ||
229 | 10 | |
230 | 15 | |
231 | 23 | |
232 | 30 (default) | |
233 | 38 | |
234 | 47 | |
235 | 62 | |
236 | 94 | |
237 | 23000 | |
238 | 24000 | |
239 | 25000 | |
240 | 26000 | |
241 | 27000 | |
242 | 28000 | |
243 | 29000 | |
244 | 30000 | |
245 | ||
246 | Setting any other value will be ignored. | |
247 | ||
248 | peci_enable | |
249 | Enables or disables PECI | |
250 | ||
251 | peci_avg | |
252 | Input filter average time. | |
253 | ||
254 | 0 0 Sec. (no Smoothing) (default) | |
255 | 1 0.25 Sec. | |
256 | 2 0.5 Sec. | |
257 | 3 1.0 Sec. | |
258 | 4 2.0 Sec. | |
259 | 5 4.0 Sec. | |
260 | 6 8.0 Sec. | |
261 | 7 0.0 Sec. | |
262 | ||
263 | peci_legacy | |
264 | ||
265 | 0 Standard Mode (default) | |
266 | Remote Diode 1 reading is associated with | |
267 | Temperature Zone 1, PECI is associated with | |
268 | Zone 4 | |
269 | ||
270 | 1 Legacy Mode | |
271 | PECI is associated with Temperature Zone 1, | |
272 | Remote Diode 1 is associated with Zone 4 | |
273 | ||
274 | peci_diode | |
275 | Diode filter | |
276 | ||
277 | 0 0.25 Sec. | |
278 | 1 1.1 Sec. | |
279 | 2 2.4 Sec. (default) | |
280 | 3 3.4 Sec. | |
281 | 4 5.0 Sec. | |
282 | 5 6.8 Sec. | |
283 | 6 10.2 Sec. | |
284 | 7 16.4 Sec. | |
285 | ||
286 | peci_4domain | |
287 | Four domain enable | |
288 | ||
289 | 0 1 or 2 Domains for enabled processors (default) | |
290 | 1 3 or 4 Domains for enabled processors | |
291 | ||
292 | peci_domain | |
293 | Domain | |
294 | ||
295 | 0 Processor contains a single domain (0) (default) | |
296 | 1 Processor contains two domains (0,1) |