soc/amd/picasso: Update TSC and monotonic timer

Picasso's TimeStamp Counter is a new design and different than
Stoney Ridge.  Although advertised as invariant, the ST TSC did
not become so until midway through POST making it an unreliable
source for measuring time.  This is not the case for Picasso.

Remove the Stoney Ridge monotonic timer code and rely on the TSC.

Modify the calculation used in Family 15h of finding the number
of boost states first, and get the frequency directly out of the
Pstate0 register.

Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Change-Id: I909743483309279eb8c3bf68852d6082381f0dff
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33765
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>

1 files changed, 0 insertions, 38 deletions

diff --git a/src/soc/amd/picasso/monotonic_timer.c b/src/soc/amd/picasso/monotonic_timer.c
deleted file mode 100644
index 7ea571f635..0000000000
--- a/src/soc/amd/picasso/monotonic_timer.c
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright 2018 Google Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <cpu/x86/msr.h>
-#include <timer.h>
-#include <timestamp.h>
-
-#define CU_PTSC_MSR	0xc0010280
-#define PTSC_FREQ_MHZ	100
-
-void timer_monotonic_get(struct mono_time *mt)
-{
-	mono_time_set_usecs(mt, timestamp_get());
-}
-
-uint64_t timestamp_get(void)
-{
-	unsigned long long val;
-	msr_t msr;
-
-	msr = rdmsr(CU_PTSC_MSR);
-
-	val = ((unsigned long long)msr.hi << 32) | msr.lo;
-
-	return val / PTSC_FREQ_MHZ;
-}