The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/Documentation/ics932s401

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    1 Kernel driver ics932s401
    2 ======================
    3 
    4 Supported chips:
    5   * IDT ICS932S401
    6     Prefix: 'ics932s401'
    7     Addresses scanned: I2C 0x69
    8     Datasheet: Publically available at the IDT website
    9 
   10 Author: Darrick J. Wong
   11 
   12 Description
   13 -----------
   14 
   15 This driver implements support for the IDT ICS932S401 chip family.
   16 
   17 This chip has 4 clock outputs--a base clock for the CPU (which is likely
   18 multiplied to get the real CPU clock), a system clock, a PCI clock, a USB
   19 clock, and a reference clock.  The driver reports selected and actual
   20 frequency.  If spread spectrum mode is enabled, the driver also reports by what
   21 percent the clock signal is being spread, which should be between 0 and -0.5%.
   22 All frequencies are reported in KHz.
   23 
   24 The ICS932S401 monitors all inputs continuously. The driver will not read
   25 the registers more often than once every other second.
   26 
   27 Special Features
   28 ----------------
   29 
   30 The clocks could be reprogrammed to increase system speed.  I will not help you
   31 do this, as you risk damaging your system!

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