igb: add PTP Hardware Clock code

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This patch adds a source file implementing a PHC. Only the basic
clock operations have been implemented, although the hardware
would offer some ancillary functions. The code is fairly self
contained and is not yet used in the main igb driver.

Every timestamp and clock read operation must consult the overflow
counter to form a correct time value. Access to the counter is
protected by a spin lock, and the counter is implemented using the
standard cyclecounter/timecounter code.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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Richard Cochran 2012-03-16 10:55:32 +00:00 • committed by Jeff Kirsher

parent 7116130251

commit d339b13316

2 changed files with 330 additions and 0 deletions

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8

drivers/net/ethernet/intel/igb/igb.h

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322

drivers/net/ethernet/intel/igb/igb_ptp.c

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