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authorWerner Zeh <werner.zeh@siemens.com>2017-10-10 12:29:53 +0200
committerMartin Roth <martinroth@google.com>2017-10-12 16:20:50 +0000
commit0ccc3c49e47d46b6f2ad8d93182414850284ae70 (patch)
tree17a802e0ca96b6db609c37dd89f8bc09ec65d29f
parent0315b6740a7cdc8fef0ae99e3549b810aa11e648 (diff)
downloadcoreboot-0ccc3c49e47d46b6f2ad8d93182414850284ae70.tar.xz
intel/fsp_broadwell_de: Add timestamp functionality
Add a little code to enable timestamps on FSP based implementation of Broadwell-DE. I have tested it by reading back the timestamps with cbmem utility once the board has booted into Lubuntu. Change-Id: Idaa65a22a00382bf0c37acf2f5a1e07c6b1b42d9 Signed-off-by: Werner Zeh <werner.zeh@siemens.com> Reviewed-on: https://review.coreboot.org/21932 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
-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);
+}