mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +00:00
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
// 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>
|
|
|
|
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();
|
|
}
|