tree aef1f536413ca77a7caacf781919596f7e04a55b
parent 47b5a9820f2f95fda349f298054ca40cc2149548
author Duncan Laurie <dlaurie@google.com> 1588187990 -0700
committer Duncan Laurie <dlaurie@chromium.org> 1590112069 +0000

soc/intel/tigerlake: Add definition for PMC EPOC

The PMC EPOC register indicates which external crystal oscillator is
connected to the PCH.  This frequency is important for determining the
IP clock of internal PCH devices.

Add definitions that allow this register to be read and extract the
crystal frequency, and a helper function to extract and return this
as the defined enum.

BUG=b:146482091

Signed-off-by: Duncan Laurie <dlaurie@google.com>
Change-Id: I959fe507f3dbf93b6176b333a9e725ed09f56328
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40887
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>