327 lines
10 KiB
ReStructuredText
327 lines
10 KiB
ReStructuredText
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=====================
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Kernel driver asc7621
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=====================
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Supported chips:
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Andigilog aSC7621 and aSC7621a
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Prefix: 'asc7621'
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Addresses scanned: I2C 0x2c, 0x2d, 0x2e
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Datasheet: http://www.fairview5.com/linux/asc7621/asc7621.pdf
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Author:
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George Joseph
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Description provided by Dave Pivin @ Andigilog:
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Andigilog has both the PECI and pre-PECI versions of the Heceta-6, as
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Intel calls them. Heceta-6e has high frequency PWM and Heceta-6p has
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added PECI and a 4th thermal zone. The Andigilog aSC7611 is the
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Heceta-6e part and aSC7621 is the Heceta-6p part. They are both in
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volume production, shipping to Intel and their subs.
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We have enhanced both parts relative to the governing Intel
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specification. First enhancement is temperature reading resolution. We
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have used registers below 20h for vendor-specific functions in addition
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to those in the Intel-specified vendor range.
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Our conversion process produces a result that is reported as two bytes.
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The fan speed control uses this finer value to produce a "step-less" fan
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PWM output. These two bytes are "read-locked" to guarantee that once a
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high or low byte is read, the other byte is locked-in until after the
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next read of any register. So to get an atomic reading, read high or low
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byte, then the very next read should be the opposite byte. Our data
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sheet says 10-bits of resolution, although you may find the lower bits
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are active, they are not necessarily reliable or useful externally. We
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chose not to mask them.
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We employ significant filtering that is user tunable as described in the
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data sheet. Our temperature reports and fan PWM outputs are very smooth
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when compared to the competition, in addition to the higher resolution
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temperature reports. The smoother PWM output does not require user
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intervention.
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We offer GPIO features on the former VID pins. These are open-drain
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outputs or inputs and may be used as general purpose I/O or as alarm
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outputs that are based on temperature limits. These are in 19h and 1Ah.
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We offer flexible mapping of temperature readings to thermal zones. Any
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temperature may be mapped to any zone, which has a default assignment
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that follows Intel's specs.
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Since there is a fan to zone assignment that allows for the "hotter" of
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a set of zones to control the PWM of an individual fan, but there is no
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indication to the user, we have added an indicator that shows which zone
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is currently controlling the PWM for a given fan. This is in register
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00h.
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Both remote diode temperature readings may be given an offset value such
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that the reported reading as well as the temperature used to determine
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PWM may be offset for system calibration purposes.
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PECI Extended configuration allows for having more than two domains per
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PECI address and also provides an enabling function for each PECI
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address. One could use our flexible zone assignment to have a zone
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assigned to up to 4 PECI addresses. This is not possible in the default
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Intel configuration. This would be useful in multi-CPU systems with
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individual fans on each that would benefit from individual fan control.
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This is in register 0Eh.
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The tachometer measurement system is flexible and able to adapt to many
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fan types. We can also support pulse-stretched PWM so that 3-wire fans
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may be used. These characteristics are in registers 04h to 07h.
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Finally, we have added a tach disable function that turns off the tach
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measurement system for individual tachs in order to save power. That is
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in register 75h.
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--------------------------------------------------------------------------
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aSC7621 Product Description
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===========================
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The aSC7621 has a two wire digital interface compatible with SMBus 2.0.
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Using a 10-bit ADC, the aSC7621 measures the temperature of two remote diode
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connected transistors as well as its own die. Support for Platform
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Environmental Control Interface (PECI) is included.
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Using temperature information from these four zones, an automatic fan speed
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control algorithm is employed to minimize acoustic impact while achieving
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recommended CPU temperature under varying operational loads.
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To set fan speed, the aSC7621 has three independent pulse width modulation
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(PWM) outputs that are controlled by one, or a combination of three,
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temperature zones. Both high- and low-frequency PWM ranges are supported.
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The aSC7621 also includes a digital filter that can be invoked to smooth
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temperature readings for better control of fan speed and minimum acoustic
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impact.
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The aSC7621 has tachometer inputs to measure fan speed on up to four fans.
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Limit and status registers for all measured values are included to alert
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the system host that any measurements are outside of programmed limits
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via status registers.
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System voltages of VCCP, 2.5V, 3.3V, 5.0V, and 12V motherboard power are
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monitored efficiently with internal scaling resistors.
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Features
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--------
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- Supports PECI interface and monitors internal and remote thermal diodes
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- 2-wire, SMBus 2.0 compliant, serial interface
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- 10-bit ADC
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- Monitors VCCP, 2.5V, 3.3V, 5.0V, and 12V motherboard/processor supplies
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- Programmable autonomous fan control based on temperature readings
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- Noise filtering of temperature reading for fan speed control
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- 0.25C digital temperature sensor resolution
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- 3 PWM fan speed control outputs for 2-, 3- or 4-wire fans and up to 4 fan
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tachometer inputs
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- Enhanced measured temperature to Temperature Zone assignment.
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- Provides high and low PWM frequency ranges
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- 3 GPIO pins for custom use
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- 24-Lead QSOP package
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Configuration Notes
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===================
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Except where noted below, the sysfs entries created by this driver follow
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the standards defined in "sysfs-interface".
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temp1_source
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= ===============================================
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0 (default) peci_legacy = 0, Remote 1 Temperature
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peci_legacy = 1, PECI Processor Temperature 0
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1 Remote 1 Temperature
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2 Remote 2 Temperature
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3 Internal Temperature
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4 PECI Processor Temperature 0
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5 PECI Processor Temperature 1
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6 PECI Processor Temperature 2
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7 PECI Processor Temperature 3
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= ===============================================
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temp2_source
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= ===============================================
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0 (default) Internal Temperature
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1 Remote 1 Temperature
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2 Remote 2 Temperature
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3 Internal Temperature
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4 PECI Processor Temperature 0
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5 PECI Processor Temperature 1
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6 PECI Processor Temperature 2
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7 PECI Processor Temperature 3
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= ===============================================
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temp3_source
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= ===============================================
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0 (default) Remote 2 Temperature
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1 Remote 1 Temperature
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2 Remote 2 Temperature
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3 Internal Temperature
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4 PECI Processor Temperature 0
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5 PECI Processor Temperature 1
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6 PECI Processor Temperature 2
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7 PECI Processor Temperature 3
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= ===============================================
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temp4_source
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= ===============================================
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0 (default) peci_legacy = 0, PECI Processor Temperature 0
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peci_legacy = 1, Remote 1 Temperature
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1 Remote 1 Temperature
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2 Remote 2 Temperature
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3 Internal Temperature
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4 PECI Processor Temperature 0
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5 PECI Processor Temperature 1
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6 PECI Processor Temperature 2
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7 PECI Processor Temperature 3
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= ===============================================
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temp[1-4]_smoothing_enable / temp[1-4]_smoothing_time
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Smooths spikes in temp readings caused by noise.
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Valid values in milliseconds are:
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* 35000
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* 17600
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* 11800
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* 7000
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* 4400
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* 3000
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* 1600
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* 800
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temp[1-4]_crit
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When the corresponding zone temperature reaches this value,
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ALL pwm outputs will got to 100%.
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temp[5-8]_input / temp[5-8]_enable
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The aSC7621 can also read temperatures provided by the processor
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via the PECI bus. Usually these are "core" temps and are relative
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to the point where the automatic thermal control circuit starts
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throttling. This means that these are usually negative numbers.
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pwm[1-3]_enable
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=============== ========================================================
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0 Fan off.
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1 Fan on manual control.
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2 Fan on automatic control and will run at the minimum pwm
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if the temperature for the zone is below the minimum.
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3 Fan on automatic control but will be off if the
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temperature for the zone is below the minimum.
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4-254 Ignored.
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255 Fan on full.
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=============== ========================================================
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pwm[1-3]_auto_channels
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Bitmap as described in sysctl-interface with the following
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exceptions...
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Only the following combination of zones (and their corresponding masks)
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are valid:
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* 1
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* 2
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* 3
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* 2,3
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* 1,2,3
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* 4
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* 1,2,3,4
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* Special values:
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== ======================
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0 Disabled.
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16 Fan on manual control.
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31 Fan on full.
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== ======================
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pwm[1-3]_invert
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When set, inverts the meaning of pwm[1-3].
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i.e. when pwm = 0, the fan will be on full and
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when pwm = 255 the fan will be off.
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pwm[1-3]_freq
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PWM frequency in Hz
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Valid values in Hz are:
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* 10
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* 15
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* 23
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* 30 (default)
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* 38
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* 47
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* 62
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* 94
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* 23000
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* 24000
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* 25000
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* 26000
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* 27000
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* 28000
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* 29000
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* 30000
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Setting any other value will be ignored.
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peci_enable
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Enables or disables PECI
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peci_avg
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Input filter average time.
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* 0 0 Sec. (no Smoothing) (default)
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* 1 0.25 Sec.
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* 2 0.5 Sec.
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* 3 1.0 Sec.
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* 4 2.0 Sec.
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* 5 4.0 Sec.
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* 6 8.0 Sec.
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* 7 0.0 Sec.
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peci_legacy
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= ============================================
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0 Standard Mode (default)
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Remote Diode 1 reading is associated with
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Temperature Zone 1, PECI is associated with
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Zone 4
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1 Legacy Mode
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PECI is associated with Temperature Zone 1,
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Remote Diode 1 is associated with Zone 4
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= ============================================
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peci_diode
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Diode filter
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= ====================
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0 0.25 Sec.
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1 1.1 Sec.
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2 2.4 Sec. (default)
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3 3.4 Sec.
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4 5.0 Sec.
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5 6.8 Sec.
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6 10.2 Sec.
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7 16.4 Sec.
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= ====================
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peci_4domain
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Four domain enable
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= ===============================================
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0 1 or 2 Domains for enabled processors (default)
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1 3 or 4 Domains for enabled processors
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= ===============================================
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peci_domain
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Domain
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= ==================================================
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0 Processor contains a single domain (0) (default)
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1 Processor contains two domains (0,1)
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= ==================================================
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