1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2019 Intel Corporation <www.intel.com> 4 */ 5 6 #include <common.h> 7 #include <cpu_func.h> 8 #include <asm/arch/slimbootloader.h> 9 10 DECLARE_GLOBAL_DATA_PTR; 11 12 /** 13 * This sets tsc_base and clock_rate for early_timer and tsc_timer. 14 * The performance info guid hob has all performance timestamp data, but 15 * the only tsc frequency info is used for the timer driver for now. 16 * 17 * Slim Bootloader already calibrated TSC and provides it to U-Boot. 18 * Therefore, U-Boot does not have to re-calibrate TSC. 19 * Configuring tsc_base and clock_rate here makes x86 tsc_timer driver 20 * bypass TSC calibration and use the provided TSC frequency. 21 */ tsc_init(void)22static void tsc_init(void) 23 { 24 struct sbl_performance_info *data; 25 const efi_guid_t guid = SBL_PERFORMANCE_INFO_GUID; 26 27 if (!gd->arch.hob_list) 28 panic("hob list not found!"); 29 30 gd->arch.tsc_base = rdtsc(); 31 debug("tsc_base=0x%llx\n", gd->arch.tsc_base); 32 33 data = hob_get_guid_hob_data(gd->arch.hob_list, NULL, &guid); 34 if (!data) { 35 debug("performance info hob not found\n"); 36 return; 37 } 38 39 /* frequency is in KHz, so to Hz */ 40 gd->arch.clock_rate = data->frequency * 1000; 41 debug("freq=0x%lx\n", gd->arch.clock_rate); 42 } 43 arch_cpu_init(void)44int arch_cpu_init(void) 45 { 46 tsc_init(); 47 48 return x86_cpu_init_f(); 49 } 50 checkcpu(void)51int checkcpu(void) 52 { 53 return 0; 54 } 55 print_cpuinfo(void)56int print_cpuinfo(void) 57 { 58 return default_print_cpuinfo(); 59 } 60