mirror of
https://github.com/smaeul/u-boot.git
synced 2025-11-04 05:50:17 +00:00
18739e2ccc
Intel chips have a turbo mode where they can run faster for a short period until they reach thermal limits. Add code to adjust and query this feature. Signed-off-by: Simon Glass <sjg@chromium.org>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
/*
|
|
* From Coreboot file of the same name
|
|
*
|
|
* Copyright (C) 2011 The Chromium Authors.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/cpu.h>
|
|
#include <asm/msr.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/turbo.h>
|
|
|
|
#if CONFIG_CPU_INTEL_TURBO_NOT_PACKAGE_SCOPED
|
|
static inline int get_global_turbo_state(void)
|
|
{
|
|
return TURBO_UNKNOWN;
|
|
}
|
|
|
|
static inline void set_global_turbo_state(int state)
|
|
{
|
|
}
|
|
#else
|
|
static int g_turbo_state = TURBO_UNKNOWN;
|
|
|
|
static inline int get_global_turbo_state(void)
|
|
{
|
|
return g_turbo_state;
|
|
}
|
|
|
|
static inline void set_global_turbo_state(int state)
|
|
{
|
|
g_turbo_state = state;
|
|
}
|
|
#endif
|
|
|
|
static const char *const turbo_state_desc[] = {
|
|
[TURBO_UNKNOWN] = "unknown",
|
|
[TURBO_UNAVAILABLE] = "unavailable",
|
|
[TURBO_DISABLED] = "available but hidden",
|
|
[TURBO_ENABLED] = "available and visible"
|
|
};
|
|
|
|
/*
|
|
* Determine the current state of Turbo and cache it for later.
|
|
* Turbo is a package level config so it does not need to be
|
|
* enabled on every core.
|
|
*/
|
|
int turbo_get_state(void)
|
|
{
|
|
struct cpuid_result cpuid_regs;
|
|
int turbo_en, turbo_cap;
|
|
msr_t msr;
|
|
int turbo_state = get_global_turbo_state();
|
|
|
|
/* Return cached state if available */
|
|
if (turbo_state != TURBO_UNKNOWN)
|
|
return turbo_state;
|
|
|
|
cpuid_regs = cpuid(CPUID_LEAF_PM);
|
|
turbo_cap = !!(cpuid_regs.eax & PM_CAP_TURBO_MODE);
|
|
|
|
msr = msr_read(MSR_IA32_MISC_ENABLES);
|
|
turbo_en = !(msr.hi & H_MISC_DISABLE_TURBO);
|
|
|
|
if (!turbo_cap && turbo_en) {
|
|
/* Unavailable */
|
|
turbo_state = TURBO_UNAVAILABLE;
|
|
} else if (!turbo_cap && !turbo_en) {
|
|
/* Available but disabled */
|
|
turbo_state = TURBO_DISABLED;
|
|
} else if (turbo_cap && turbo_en) {
|
|
/* Available */
|
|
turbo_state = TURBO_ENABLED;
|
|
}
|
|
|
|
set_global_turbo_state(turbo_state);
|
|
debug("Turbo is %s\n", turbo_state_desc[turbo_state]);
|
|
return turbo_state;
|
|
}
|
|
|
|
void turbo_enable(void)
|
|
{
|
|
msr_t msr;
|
|
|
|
/* Only possible if turbo is available but hidden */
|
|
if (turbo_get_state() == TURBO_DISABLED) {
|
|
/* Clear Turbo Disable bit in Misc Enables */
|
|
msr = msr_read(MSR_IA32_MISC_ENABLES);
|
|
msr.hi &= ~H_MISC_DISABLE_TURBO;
|
|
msr_write(MSR_IA32_MISC_ENABLES, msr);
|
|
|
|
/* Update cached turbo state */
|
|
set_global_turbo_state(TURBO_ENABLED);
|
|
debug("Turbo has been enabled\n");
|
|
}
|
|
}
|