mirror of
https://github.com/AsahiLinux/u-boot
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98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* From Coreboot file of the same name
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*
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* Copyright (C) 2011 The Chromium Authors.
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*/
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#include <common.h>
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#include <log.h>
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#include <asm/cpu.h>
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#include <asm/msr.h>
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#include <asm/processor.h>
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#include <asm/turbo.h>
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DECLARE_GLOBAL_DATA_PTR;
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#ifdef CONFIG_CPU_INTEL_TURBO_NOT_PACKAGE_SCOPED
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static inline int get_global_turbo_state(void)
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{
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return TURBO_UNKNOWN;
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}
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static inline void set_global_turbo_state(int state)
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{
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}
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#else
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static inline int get_global_turbo_state(void)
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{
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return gd->arch.turbo_state;
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}
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static inline void set_global_turbo_state(int state)
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{
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gd->arch.turbo_state = state;
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}
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#endif
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static const char *const turbo_state_desc[] = {
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[TURBO_UNKNOWN] = "unknown",
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[TURBO_UNAVAILABLE] = "unavailable",
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[TURBO_DISABLED] = "available but hidden",
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[TURBO_ENABLED] = "available and visible"
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};
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/*
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* Determine the current state of Turbo and cache it for later.
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* Turbo is a package level config so it does not need to be
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* enabled on every core.
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*/
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int turbo_get_state(void)
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{
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struct cpuid_result cpuid_regs;
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int turbo_en, turbo_cap;
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msr_t msr;
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int turbo_state = get_global_turbo_state();
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/* Return cached state if available */
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if (turbo_state != TURBO_UNKNOWN)
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return turbo_state;
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cpuid_regs = cpuid(CPUID_LEAF_PM);
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turbo_cap = !!(cpuid_regs.eax & PM_CAP_TURBO_MODE);
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msr = msr_read(MSR_IA32_MISC_ENABLE);
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turbo_en = !(msr.hi & MISC_DISABLE_TURBO);
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if (!turbo_cap && turbo_en) {
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/* Unavailable */
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turbo_state = TURBO_UNAVAILABLE;
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} else if (!turbo_cap && !turbo_en) {
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/* Available but disabled */
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turbo_state = TURBO_DISABLED;
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} else if (turbo_cap && turbo_en) {
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/* Available */
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turbo_state = TURBO_ENABLED;
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}
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set_global_turbo_state(turbo_state);
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debug("Turbo is %s\n", turbo_state_desc[turbo_state]);
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return turbo_state;
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}
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void turbo_enable(void)
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{
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msr_t msr;
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/* Only possible if turbo is available but hidden */
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if (turbo_get_state() == TURBO_DISABLED) {
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/* Clear Turbo Disable bit in Misc Enables */
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msr = msr_read(MSR_IA32_MISC_ENABLE);
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msr.hi &= ~MISC_DISABLE_TURBO;
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msr_write(MSR_IA32_MISC_ENABLE, msr);
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/* Update cached turbo state */
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set_global_turbo_state(TURBO_ENABLED);
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debug("Turbo has been enabled\n");
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}
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}
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