Change in coreboot[master]: cpu/intel/model_206ax: Use tsc monotonic timer

[Patrick Rudolph (Code Review)]

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/20044

Change subject: cpu/intel/model_206ax: Use tsc monotonic timer
......................................................................

cpu/intel/model_206ax: Use tsc monotonic timer

Switch from lapic to tsc.

Allows timestamps to be used in coreboot, as there's a reference
clock available to calculate correct time units.

Tested on Lenovo T430.

Change-Id: I849ca2b3908116d9d22907039cd6e4464444b1d1
Signed-off-by: Patrick Rudolph 
---
M src/cpu/intel/model_206ax/Kconfig
M src/cpu/intel/model_206ax/Makefile.inc
A src/cpu/intel/model_206ax/tsc_freq.c
3 files changed, 34 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/44/20044/1

diff --git a/src/cpu/intel/model_206ax/Kconfig b/src/cpu/intel/model_206ax/Kconfig
index 6c04fba..1415111 100644
--- a/src/cpu/intel/model_206ax/Kconfig
+++ b/src/cpu/intel/model_206ax/Kconfig
@@ -12,14 +12,15 @@
    select ARCH_VERSTAGE_X86_32
    select ARCH_ROMSTAGE_X86_32
    select ARCH_RAMSTAGE_X86_32
+	select HAVE_MONOTONIC_TIMER
    select SMP
    select SSE2
-	select UDELAY_LAPIC
+	select UDELAY_TSC
+	select TSC_CONSTANT_RATE
    select SMM_TSEG
    select SUPPORT_CPU_UCODE_IN_CBFS
    #select AP_IN_SIPI_WAIT
    select TSC_SYNC_MFENCE
-	select LAPIC_MONOTONIC_TIMER
    select CPU_INTEL_COMMON

config BOOTBLOCK_CPU_INIT
diff --git a/src/cpu/intel/model_206ax/Makefile.inc b/src/cpu/intel/model_206ax/Makefile.inc
index b79ccd7..7516e9d 100644
--- a/src/cpu/intel/model_206ax/Makefile.inc
+++ b/src/cpu/intel/model_206ax/Makefile.inc
@@ -5,6 +5,10 @@

ramstage-y += acpi.c

+ramstage-y += tsc_freq.c
+romstage-y += tsc_freq.c
+smm-$(CONFIG_HAVE_SMI_HANDLER) += tsc_freq.c
+
 smm-$(CONFIG_HAVE_SMI_HANDLER) += finalize.c

cpu_microcode_bins += 3rdparty/blobs/cpu/intel/model_206ax/microcode.bin
diff --git a/src/cpu/intel/model_206ax/tsc_freq.c b/src/cpu/intel/model_206ax/tsc_freq.c
new file mode 100644
index 0000000..545ca5f
--- /dev/null
+++ b/src/cpu/intel/model_206ax/tsc_freq.c
@@ -0,0 +1,27 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 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; 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 <stdint.h>
+#include <cpu/x86/msr.h>
+#include <cpu/x86/tsc.h>
+#include "model_206ax.h"
+
+unsigned long tsc_freq_mhz(void)
+{
+	msr_t platform_info;
+
+	platform_info = rdmsr(MSR_PLATFORM_INFO);
+	return SANDYBRIDGE_BCLK * ((platform_info.lo >> 8) & 0xff);
+}