83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
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 <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_ENABLES);
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turbo_en = !(msr.hi & H_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_ENABLES);
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msr.hi &= ~H_MISC_DISABLE_TURBO;
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msr_write(MSR_IA32_MISC_ENABLES, 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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