New patch to review for coreboot: soc/intel/quark: Add monotonic timer support

[Lee Leahy]

Lee Leahy ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/18002

-gerrit

commit 100a6b77fd6066d681bf74567efd085096455a54
Author: Lee Leahy 
Date:   Sat Dec 31 08:21:56 2016 -0800

soc/intel/quark: Add monotonic timer support

Add the Kconfig value HAVE_MONOTONIC_TIMER and the routine to read the
    TSC for the monotonic timer.  Simplify the routine to get the TSC
    frequency.

TEST=Build and run on Galileo Gen2

Change-Id: I806fb864b01e39277bf2d6276254b0543930c2f6
    Signed-off-by: Lee Leahy 
---
 src/soc/intel/quark/Kconfig    |  1 +
 src/soc/intel/quark/tsc_freq.c | 16 +++++++---------
 2 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/src/soc/intel/quark/Kconfig b/src/soc/intel/quark/Kconfig
index c5efd4a..8182caa 100644
--- a/src/soc/intel/quark/Kconfig
+++ b/src/soc/intel/quark/Kconfig
@@ -29,6 +29,7 @@ config CPU_SPECIFIC_OPTIONS
    select BOOTBLOCK_SAVE_BIST_AND_TIMESTAMP
    select C_ENVIRONMENT_BOOTBLOCK
    select HAVE_HARD_RESET
+	select HAVE_MONOTONIC_TIMER
    select NO_MMCONF_SUPPORT
    select REG_SCRIPT
    select RELOCATABLE_RAMSTAGE
diff --git a/src/soc/intel/quark/tsc_freq.c b/src/soc/intel/quark/tsc_freq.c
index eb8c46e..e6d0369 100644
--- a/src/soc/intel/quark/tsc_freq.c
+++ b/src/soc/intel/quark/tsc_freq.c
@@ -17,20 +17,18 @@
 #include <stdint.h>
 #include <cpu/x86/msr.h>
 #include <cpu/x86/tsc.h>
+#include <timer.h>

-static unsigned long bus_freq_khz(void)
+unsigned long tsc_freq_mhz(void)
 {
    /* CPU freq = 400 MHz */
-	return 400 * 1000;
+	return 400;
 }

-unsigned long tsc_freq_mhz(void)
+void timer_monotonic_get(struct mono_time *mt)
 {
-	/* assume ratio=1 */
-	unsigned bclk_khz = bus_freq_khz();
-
-	if (!bclk_khz)
-		return 0;
+	uint64_t tsc_value;

-	return (bclk_khz * 1) / 1000;
+	tsc_value = rdtscll();
+	mt->microseconds = tsc_value / tsc_freq_mhz();
 }