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Diffstat (limited to 'arch/x86/include/asm/cpu_common.h')
-rw-r--r-- | arch/x86/include/asm/cpu_common.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/arch/x86/include/asm/cpu_common.h b/arch/x86/include/asm/cpu_common.h new file mode 100644 index 0000000..cdd99a9 --- /dev/null +++ b/arch/x86/include/asm/cpu_common.h @@ -0,0 +1,131 @@ +/* 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; + +/** + * 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); + +#endif |