diff options
author | Andrey Petrov <andrey.petrov@intel.com> | 2016-02-10 17:47:03 -0800 |
---|---|---|
committer | Aaron Durbin <adurbin@chromium.org> | 2016-02-11 21:16:45 +0100 |
commit | 87fb1a6cdbb58d5031f0dcf9b8ddf200df70a068 (patch) | |
tree | 0726805fa683a33d4508ddb731e1cad33423620e /src/soc/intel/apollolake/tsc_freq.c | |
parent | 57799dcdd1d80e8f1c8f5cd602796c34522bbb15 (diff) |
soc/apollolake: Add early serial driver for BOOTBLOCK_CONSOLE
Early UART driver is for bootblock and romstage. It is supposed to be used
when BOOTBLOCK_CONSOLE is enabled. This also adds few configuration bits
in bootblock requiered for serial to be set up.
Change-Id: I15520d566f107797e68d618885d4379e73d0fa45
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/13677
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/soc/intel/apollolake/tsc_freq.c')
-rw-r--r-- | src/soc/intel/apollolake/tsc_freq.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/tsc_freq.c b/src/soc/intel/apollolake/tsc_freq.c new file mode 100644 index 0000000000..b6320eda8f --- /dev/null +++ b/src/soc/intel/apollolake/tsc_freq.c @@ -0,0 +1,20 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2015 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)); +} |