[coreboot-gerrit] Patch set updated for coreboot: soc/apollolake: Add tsc_freq_mhz() functionality for udelay()
Alexandru Gagniuc (mr.nuke.me@gmail.com)
gerrit at coreboot.org
Tue Feb 2 22:09:55 CET 2016
Alexandru Gagniuc (mr.nuke.me at gmail.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/13303
-gerrit
commit 62778a6106c09fc0b4a25e8cbf33432b3f213dd6
Author: Alexandru Gagniuc <alexandrux.gagniuc at intel.com>
Date: Tue Oct 6 16:31:34 2015 -0700
soc/apollolake: Add tsc_freq_mhz() functionality for udelay()
Change-Id: I2f1147cefe2438992bff45fc0a1e91064217915d
Signed-off-by: Alexandru Gagniuc <alexandrux.gagniuc at intel.com>
---
src/soc/intel/apollolake/Kconfig | 1 +
src/soc/intel/apollolake/Makefile.inc | 5 +++++
src/soc/intel/apollolake/include/soc/cpu.h | 20 ++++++++++++++++++++
src/soc/intel/apollolake/tsc_freq.c | 21 +++++++++++++++++++++
4 files changed, 47 insertions(+)
diff --git a/src/soc/intel/apollolake/Kconfig b/src/soc/intel/apollolake/Kconfig
index f7ae68e..825a40f 100644
--- a/src/soc/intel/apollolake/Kconfig
+++ b/src/soc/intel/apollolake/Kconfig
@@ -32,6 +32,7 @@ config CPU_SPECIFIC_OPTIONS
select RELOCATABLE_RAMSTAGE # Build fails if this is not selected
select SOC_INTEL_COMMON
select UDELAY_TSC
+ select TSC_CONSTANT_RATE
config MMCONF_BASE_ADDRESS
hex "PCI MMIO Base Address"
diff --git a/src/soc/intel/apollolake/Makefile.inc b/src/soc/intel/apollolake/Makefile.inc
index cc3e013..17b4ae4 100644
--- a/src/soc/intel/apollolake/Makefile.inc
+++ b/src/soc/intel/apollolake/Makefile.inc
@@ -10,6 +10,11 @@ subdirs-y += ../../../cpu/x86/tsc
bootblock-y += bootblock/bootblock_car.c
bootblock-y += bootblock/cache_as_ram.S
bootblock-y += bootblock/early_chipset_config.S
+bootblock-y += tsc_freq.c
+
+romstage-y += tsc_freq.c
+
+ramstage-y += tsc_freq.c
romstage-y += placeholders.c
smm-y += placeholders.c
diff --git a/src/soc/intel/apollolake/include/soc/cpu.h b/src/soc/intel/apollolake/include/soc/cpu.h
new file mode 100644
index 0000000..d0d6afd
--- /dev/null
+++ b/src/soc/intel/apollolake/include/soc/cpu.h
@@ -0,0 +1,20 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Intel Corp.
+ * (Written by Alexandru Gagniuc <alexandrux.gagniuc at intel.com> for Intel Corp.)
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef _SOC_APOLLOLAKE_CPU_H_
+#define _SOC_APOLLOLAKE_CPU_H_
+
+#define MSR_PLATFORM_INFO 0xce
+
+#define BASE_CLOCK_MHZ 100
+
+#endif /* _SOC_APOLLOLAKE_CPU_H_ */
diff --git a/src/soc/intel/apollolake/tsc_freq.c b/src/soc/intel/apollolake/tsc_freq.c
new file mode 100644
index 0000000..2e90ef2
--- /dev/null
+++ b/src/soc/intel/apollolake/tsc_freq.c
@@ -0,0 +1,21 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Intel Corp.
+ * (Written by Alexandru Gagniuc <alexandrux.gagniuc at intel.com> for Intel Corp.)
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <cpu/x86/msr.h>
+#include <cpu/x86/tsc.h>
+#include <soc/cpu.h>
+
+unsigned long tsc_freq_mhz(void)
+{
+ msr_t msr = rdmsr(MSR_PLATFORM_INFO);
+ return (BASE_CLOCK_MHZ * ((msr.lo >> 8) & 0xff));
+}
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