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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Common code for Intel CPUs
*
* Copyright (c) 2016 Google, Inc
*/
#ifndef __ASM_CPU_COMMON_H
#define __ASM_CPU_COMMON_H
/* Standard Intel bus clock is fixed at 100MHz */
enum {
INTEL_BCLK_MHZ = 100
};
struct cpu_info;
struct udevice;
/**
* cpu_common_init() - Set up common CPU init
*
* This reports BIST failure, enables the LAPIC, updates microcode, enables
* the upper 128-bytes of CROM RAM, probes the northbridge, PCH, LPC and SATA.
*
* Return: 0 if OK, -ve on error
*/
int cpu_common_init(void);
/**
* cpu_set_flex_ratio_to_tdp_nominal() - Set up the maximum non-turbo rate
*
* If a change is needed, this function will do a soft reset so it takes
* effect.
*
* Some details are available here:
* http://forum.hwbot.org/showthread.php?t=76092
*
* Return: 0 if OK, -ve on error
*/
int cpu_set_flex_ratio_to_tdp_nominal(void);
/**
* cpu_intel_get_info() - Obtain CPU info for Intel CPUs
*
* Most Intel CPUs use the same MSR to obtain the clock speed, and use the same
* features. This function fills in these values, given the value of the base
* clock in MHz (typically this should be set to 100).
*
* @info: cpu_info struct to fill in
* @bclk_mz: the base clock in MHz
*
* Return: 0 always
*/
int cpu_intel_get_info(struct cpu_info *info, int bclk_mz);
/**
* cpu_configure_thermal_target() - Set the thermal target for a CPU
*
* This looks up the tcc-offset property and uses it to set the
* MSR_TEMPERATURE_TARGET value.
*
* @dev: CPU device
* Return: 0 if OK, -ENOENT if no target is given in device tree
*/
int cpu_configure_thermal_target(struct udevice *dev);
/**
* cpu_set_perf_control() - Set the nominal CPU clock speed
*
* This sets the clock speed as a multiplier of BCLK
*
* @clk_ratio: Ratio to use
*/
void cpu_set_perf_control(uint clk_ratio);
/**
* cpu_config_tdp_levels() - Check for configurable TDP option
*
* Return: true if the CPU has configurable TDP (Thermal-design power)
*/
bool cpu_config_tdp_levels(void);
/** enum burst_mode_t - Burst-mode states */
enum burst_mode_t {
BURST_MODE_UNKNOWN,
BURST_MODE_UNAVAILABLE,
BURST_MODE_DISABLED,
BURST_MODE_ENABLED
};
/*
* cpu_get_burst_mode_state() - Get the Burst/Turbo Mode State
*
* This reads MSR IA32_MISC_ENABLE 0x1A0
* Bit 38 - TURBO_MODE_DISABLE Bit to get state ENABLED / DISABLED.
* Also checks cpuid 0x6 to see whether burst mode is supported.
*
* Return: current burst mode status
*/
enum burst_mode_t cpu_get_burst_mode_state(void);
/**
* cpu_set_burst_mode() - Set CPU burst mode
*
* @burst_mode: true to enable burst mode, false to disable
*/
void cpu_set_burst_mode(bool burst_mode);
/**
* cpu_set_eist() - Enable Enhanced Intel Speed Step Technology
*
* @eist_status: true to enable EIST, false to disable
*/
void cpu_set_eist(bool eist_status);
/**
* cpu_set_p_state_to_turbo_ratio() - Set turbo ratio
*
* TURBO_RATIO_LIMIT MSR (0x1AD) Bits 31:0 indicates the
* factory configured values for of 1-core, 2-core, 3-core
* and 4-core turbo ratio limits for all processors.
*
* 7:0 - MAX_TURBO_1_CORE
* 15:8 - MAX_TURBO_2_CORES
* 23:16 - MAX_TURBO_3_CORES
* 31:24 - MAX_TURBO_4_CORES
*
* Set PERF_CTL MSR (0x199) P_Req with that value.
*/
void cpu_set_p_state_to_turbo_ratio(void);
/**
* cpu_get_coord_type() - Get the type of coordination for P-State transition
*
* See ACPI spec v6.3 section 8.4.6.5 _PSD (P-State Dependency)
*
* Return: HW_ALL (always)
*/
int cpu_get_coord_type(void);
/**
* cpu_get_min_ratio() - get minimum support frequency ratio for CPU
*
* Return: minimum ratio
*/
int cpu_get_min_ratio(void);
/**
* cpu_get_max_ratio() - get nominal TDP ration or max non-turbo ratio
*
* If a nominal TDP ratio is available, it is returned. Otherwise this returns
* the maximum non-turbo frequency ratio for this processor
*
* Return: max ratio
*/
int cpu_get_max_ratio(void);
/**
* cpu_get_bus_clock_khz() - Get the bus clock frequency in KHz
*
* This is the value the clock ratio is multiplied with
*
* Return: bus-block frequency in KHz
*/
int cpu_get_bus_clock_khz(void);
/**
* cpu_get_power_max() - Get maximum CPU TDP
*
* Return: maximum CPU TDP (Thermal-design power) in mW
*/
int cpu_get_power_max(void);
/**
* cpu_get_max_turbo_ratio() - Get maximum turbo ratio
*
* Return: maximum ratio
*/
int cpu_get_max_turbo_ratio(void);
/**
* cpu_get_cores_per_package() - Get the number of CPU cores in each package
*
* Return: number of cores
*/
int cpu_get_cores_per_package(void);
/**
* cpu_mca_configure() - Set up machine-check exceptions ready for use
*
* These allow the SoC to report errors while running. See here for details:
*
* https://www.intel.com/content/dam/www/public/us/en/documents/white-papers/machine-check-exceptions-debug-paper.pdf
*/
void cpu_mca_configure(void);
#endif
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