/* SPDX-License-Identifier: GPL-2.0-only */ #include <stdint.h> #include <arch/bootblock.h> #include <cpu/x86/msr.h> #include <arch/io.h> #include <delay.h> #include <halt.h> #include "haswell.h" #include <southbridge/intel/lynxpoint/pch.h> static void set_flex_ratio_to_tdp_nominal(void) { msr_t flex_ratio, msr; u32 soft_reset; u8 nominal_ratio; /* Check for Flex Ratio support */ flex_ratio = rdmsr(MSR_FLEX_RATIO); if (!(flex_ratio.lo & FLEX_RATIO_EN)) return; /* Check for >0 configurable TDPs */ msr = rdmsr(MSR_PLATFORM_INFO); if (((msr.hi >> 1) & 3) == 0) return; /* Use nominal TDP ratio for flex ratio */ msr = rdmsr(MSR_CONFIG_TDP_NOMINAL); nominal_ratio = msr.lo & 0xff; /* See if flex ratio is already set to nominal TDP ratio */ if (((flex_ratio.lo >> 8) & 0xff) == nominal_ratio) return; /* Set flex ratio to nominal TDP ratio */ flex_ratio.lo &= ~0xff00; flex_ratio.lo |= nominal_ratio << 8; flex_ratio.lo |= FLEX_RATIO_LOCK; wrmsr(MSR_FLEX_RATIO, flex_ratio); /* Set flex ratio in soft reset data register bits 11:6. * RCBA region is enabled in southbridge bootblock */ soft_reset = RCBA32(SOFT_RESET_DATA); soft_reset &= ~(0x3f << 6); soft_reset |= (nominal_ratio & 0x3f) << 6; RCBA32(SOFT_RESET_DATA) = soft_reset; /* Set soft reset control to use register value */ RCBA32_OR(SOFT_RESET_CTRL, 1); /* Delay before reset to avoid potential TPM lockout */ if (CONFIG(TPM)) mdelay(30); /* Issue warm reset, will be "CPU only" due to soft reset data */ outb(0x0, 0xcf9); outb(0x6, 0xcf9); halt(); } void bootblock_early_cpu_init(void) { /* Set flex ratio and reset if needed */ set_flex_ratio_to_tdp_nominal(); }