// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2019 Intel Corporation <www.intel.com> */ #include <common.h> #include <cpu_func.h> #include <init.h> #include <log.h> #include <asm/arch/slimbootloader.h> #include <asm/global_data.h> DECLARE_GLOBAL_DATA_PTR; /** * This sets tsc_base and clock_rate for early_timer and tsc_timer. * The performance info guid hob has all performance timestamp data, but * the only tsc frequency info is used for the timer driver for now. * * Slim Bootloader already calibrated TSC and provides it to U-Boot. * Therefore, U-Boot does not have to re-calibrate TSC. * Configuring tsc_base and clock_rate here makes x86 tsc_timer driver * bypass TSC calibration and use the provided TSC frequency. */ static void tsc_init(void) { struct sbl_performance_info *data; const efi_guid_t guid = SBL_PERFORMANCE_INFO_GUID; if (!gd->arch.hob_list) panic("hob list not found!"); gd->arch.tsc_base = rdtsc(); debug("tsc_base=0x%llx\n", gd->arch.tsc_base); data = hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid); if (!data) { debug("performance info hob not found\n"); return; } /* frequency is in KHz, so to Hz */ gd->arch.clock_rate = data->frequency * 1000; debug("freq=0x%lx\n", gd->arch.clock_rate); } int arch_cpu_init(void) { tsc_init(); return x86_cpu_init_f(); } int checkcpu(void) { return 0; } int print_cpuinfo(void) { return default_print_cpuinfo(); }