diff options
Diffstat (limited to 'src/soc/intel/quark/tsc_freq.c')
-rw-r--r-- | src/soc/intel/quark/tsc_freq.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/soc/intel/quark/tsc_freq.c b/src/soc/intel/quark/tsc_freq.c new file mode 100644 index 0000000000..a770c81bf1 --- /dev/null +++ b/src/soc/intel/quark/tsc_freq.c @@ -0,0 +1,36 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google Inc. + * Copyright (C) 2015-2016 Intel Corporation. + * + * 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> + +static unsigned long bus_freq_khz(void) +{ + /* cpu freq = 400 MHz */ + return 400 * 1000; +} + +unsigned long tsc_freq_mhz(void) +{ + /* assume ratio=1 */ + unsigned bclk_khz = bus_freq_khz(); + + if (!bclk_khz) + return 0; + + return (bclk_khz * 1) / 1000; +} |