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authorLee Leahy <leroy.p.leahy@intel.com>2016-12-31 08:21:56 -0800
committerLee Leahy <leroy.p.leahy@intel.com>2017-01-04 00:03:44 +0100
commit68fdb785b2183cfa3312266b4a800174ba2d64e5 (patch)
treea8c956b62216ff4fe2be621121449d918b518843
parent37935573bfe0c8c8f3e2aeb6e4d2f451539f0f91 (diff)
downloadcoreboot-68fdb785b2183cfa3312266b4a800174ba2d64e5.tar.xz
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 <leroy.p.leahy@intel.com> Reviewed-on: https://review.coreboot.org/18002 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Martin Roth <martinroth@google.com>
-rw-r--r--src/soc/intel/quark/Kconfig1
-rw-r--r--src/soc/intel/quark/tsc_freq.c16
2 files changed, 8 insertions, 9 deletions
diff --git a/src/soc/intel/quark/Kconfig b/src/soc/intel/quark/Kconfig
index c5efd4a296..8182caa51c 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 eb8c46ecf2..e6d0369eff 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();
}