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-rw-r--r--src/soc/intel/fsp_broadwell_de/Makefile.inc3
-rw-r--r--src/soc/intel/fsp_broadwell_de/include/soc/broadwell_de.h3
-rw-r--r--src/soc/intel/fsp_broadwell_de/tsc_freq.c28
3 files changed, 34 insertions, 0 deletions
diff --git a/src/soc/intel/fsp_broadwell_de/Makefile.inc b/src/soc/intel/fsp_broadwell_de/Makefile.inc
index 028c45d6dc..38cc4411db 100644
--- a/src/soc/intel/fsp_broadwell_de/Makefile.inc
+++ b/src/soc/intel/fsp_broadwell_de/Makefile.inc
@@ -16,6 +16,7 @@ ramstage-y += cpu.c
ramstage-y += chip.c
ramstage-y += northcluster.c
ramstage-y += ramstage.c
+ramstage-y += tsc_freq.c
romstage-y += memmap.c
ramstage-y += memmap.c
ramstage-y += southcluster.c
@@ -24,11 +25,13 @@ ramstage-y += reset.c
ramstage-y += acpi.c
ramstage-y += smbus_common.c
ramstage-y += smbus.c
+romstage-y += tsc_freq.c
ramstage-y += smi.c
ramstage-$(CONFIG_HAVE_SMI_HANDLER) += smmrelocate.c
ramstage-$(CONFIG_HAVE_SMI_HANDLER) += pmutil.c
smm-$(CONFIG_HAVE_SMI_HANDLER) += pmutil.c
smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
+smm-$(CONFIG_HAVE_SMI_HANDLER) += tsc_freq.c
CPPFLAGS_common += -I$(src)/soc/intel/fsp_broadwell_de/include
CPPFLAGS_common += -I$(src)/soc/intel/fsp_broadwell_de/fsp
diff --git a/src/soc/intel/fsp_broadwell_de/include/soc/broadwell_de.h b/src/soc/intel/fsp_broadwell_de/include/soc/broadwell_de.h
index 4c11f386dd..dc1ec190a2 100644
--- a/src/soc/intel/fsp_broadwell_de/include/soc/broadwell_de.h
+++ b/src/soc/intel/fsp_broadwell_de/include/soc/broadwell_de.h
@@ -26,4 +26,7 @@
#define TSEG_BASE 0xa8 /* TSEG base */
#define TSEG_LIMIT 0xac /* TSEG limit */
+/* CPU bus clock is fixed at 100MHz */
+#define CPU_BCLK 100
+
#endif /* _SOC_BROADWELL_DE_H_ */
diff --git a/src/soc/intel/fsp_broadwell_de/tsc_freq.c b/src/soc/intel/fsp_broadwell_de/tsc_freq.c
new file mode 100644
index 0000000000..4225a3ab22
--- /dev/null
+++ b/src/soc/intel/fsp_broadwell_de/tsc_freq.c
@@ -0,0 +1,28 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 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 <soc/msr.h>
+#include <soc/broadwell_de.h>
+
+unsigned long tsc_freq_mhz(void)
+{
+ msr_t platform_info;
+
+ platform_info = rdmsr(MSR_PLATFORM_INFO);
+ return CPU_BCLK * ((platform_info.lo >> 8) & 0xff);
+}