diff options
Diffstat (limited to 'src/soc/intel/common/block/cpu/cpulib.c')
| -rw-r--r-- | src/soc/intel/common/block/cpu/cpulib.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/cpu/cpulib.c b/src/soc/intel/common/block/cpu/cpulib.c new file mode 100644 index 0000000000..325e1bb857 --- /dev/null +++ b/src/soc/intel/common/block/cpu/cpulib.c @@ -0,0 +1,228 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2014 Google Inc. + * Copyright (C) 2015 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <arch/io.h> +#include <console/console.h> +#include <cpu/intel/turbo.h> +#include <cpu/x86/msr.h> +#include <cpu/x86/mtrr.h> +#include <delay.h> +#include <intelblocks/cpulib.h> +#include <intelblocks/fast_spi.h> +#include <lib.h> +#include <reset.h> +#include <soc/cpu.h> +#include <soc/iomap.h> +#include <soc/pm.h> +#include <intelblocks/msr.h> +#include <soc/pci_devs.h> +#include <stdint.h> + +/* + * Set PERF_CTL MSR (0x199) P_Req (14:8 bits) with + * Turbo Ratio which is the Maximum Ratio. + */ +void cpu_set_max_ratio(void) +{ + /* Check for configurable TDP option */ + if (get_turbo_state() == TURBO_ENABLED) + cpu_set_p_state_to_turbo_ratio(); +} + +/* + * Get the TDP Nominal Ratio from MSR 0x648 Bits 7:0. + */ +u8 cpu_get_tdp_nominal_ratio(void) +{ + u8 nominal_ratio; + msr_t msr; + + msr = rdmsr(MSR_CONFIG_TDP_NOMINAL); + nominal_ratio = msr.lo & 0xff; + return nominal_ratio; +} + +/* + * Read PLATFORM_INFO MSR (0xCE). + * Return Value of Bit 34:33 (CONFIG_TDP_LEVELS). + * + * Possible values of Bit 34:33 are - + * 00 : Config TDP not supported + * 01 : One Additional TDP level supported + * 10 : Two Additional TDP level supported + * 11 : Reserved + */ +int cpu_config_tdp_levels(void) +{ + msr_t platform_info; + + /* Bits 34:33 indicate how many levels supported */ + platform_info = rdmsr(MSR_PLATFORM_INFO); + return (platform_info.hi >> 1) & 3; +} + +/* + * 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 (14:8 bits) with that value. + */ +void cpu_set_p_state_to_turbo_ratio(void) +{ + msr_t msr, perf_ctl; + + msr = rdmsr(MSR_TURBO_RATIO_LIMIT); + perf_ctl.lo = (msr.lo & 0xff) << 8; + perf_ctl.hi = 0; + + wrmsr(MSR_IA32_PERF_CTL, perf_ctl); + printk(BIOS_DEBUG, "CPU: frequency set to %d MHz\n", + ((perf_ctl.lo >> 8) & 0xff) * CONFIG_CPU_BCLK_MHZ); +} + +/* + * CONFIG_TDP_NOMINAL MSR (0x648) Bits 7:0 tells Nominal + * TDP level ratio to be used for specific processor (in units + * of 100MHz). + * + * Set PERF_CTL MSR (0x199) P_Req (14:8 bits) with that value. + */ +void cpu_set_p_state_to_nominal_tdp_ratio(void) +{ + msr_t msr, perf_ctl; + + msr = rdmsr(MSR_CONFIG_TDP_NOMINAL); + perf_ctl.lo = (msr.lo & 0xff) << 8; + perf_ctl.hi = 0; + + wrmsr(MSR_IA32_PERF_CTL, perf_ctl); + printk(BIOS_DEBUG, "CPU: frequency set to %d MHz\n", + ((perf_ctl.lo >> 8) & 0xff) * CONFIG_CPU_BCLK_MHZ); +} + +/* + * PLATFORM_INFO MSR (0xCE) Bits 15:8 tells + * MAX_NON_TURBO_LIM_RATIO. + * + * Set PERF_CTL MSR (0x199) P_Req (14:8 bits) with that value. + */ +void cpu_set_p_state_to_max_non_turbo_ratio(void) +{ + msr_t msr, perf_ctl; + + /* Platform Info bits 15:8 give max ratio */ + msr = rdmsr(MSR_PLATFORM_INFO); + perf_ctl.lo = msr.lo & 0xff00; + perf_ctl.hi = 0; + + wrmsr(MSR_IA32_PERF_CTL, perf_ctl); + printk(BIOS_DEBUG, "CPU: frequency set to %d MHz\n", + ((perf_ctl.lo >> 8) & 0xff) * CONFIG_CPU_BCLK_MHZ); +} + +/* + * Get the Burst/Turbo Mode State from MSR IA32_MISC_ENABLE 0x1A0 + * Bit 38 - TURBO_MODE_DISABLE Bit to get state ENABLED / DISABLED. + * Also check for the cpuid 0x6 to check whether Burst mode unsupported. + */ +int cpu_get_burst_mode_state(void) +{ + + msr_t msr; + unsigned int eax; + int burst_en, burst_cap, burst_state = BURST_MODE_UNKNOWN; + + eax = cpuid_eax(0x6); + burst_cap = eax & 0x2; + msr = rdmsr(IA32_MISC_ENABLE); + burst_en = !(msr.hi & BURST_MODE_DISABLE); + + if (!burst_cap && burst_en) { + burst_state = BURST_MODE_UNAVAILABLE; + } else if (burst_cap && !burst_en) { + burst_state = BURST_MODE_DISABLED; + } else if (burst_cap && burst_en) { + burst_state = BURST_MODE_ENABLED; + } + return burst_state; +} + +/* + * Enable Burst mode. + */ +void cpu_enable_burst_mode(void) +{ + msr_t msr; + + msr = rdmsr(IA32_MISC_ENABLE); + msr.hi &= ~BURST_MODE_DISABLE; + wrmsr(IA32_MISC_ENABLE, msr); +} + +/* + * Disable Burst mode. + */ +void cpu_disable_burst_mode(void) +{ + msr_t msr; + + msr = rdmsr(IA32_MISC_ENABLE); + msr.hi |= BURST_MODE_DISABLE; + wrmsr(IA32_MISC_ENABLE, msr); +} + +/* + * Enable Intel Enhanced Speed Step Technology. + */ +void cpu_enable_eist(void) +{ + msr_t msr; + + msr = rdmsr(IA32_MISC_ENABLE); + msr.lo |= (1 << 16); /* Enhanced SpeedStep Enable */ + wrmsr(IA32_MISC_ENABLE, msr); +} + +/* + * Disable Intel Enhanced Speed Step Technology. + */ +void cpu_disable_eist(void) +{ + msr_t msr; + + msr = rdmsr(IA32_MISC_ENABLE); + msr.lo &= ~(1 << 16); /* Enhanced SpeedStep Disable */ + wrmsr(IA32_MISC_ENABLE, msr); +} + +/* + * Set Bit 6 (ENABLE_IA_UNTRUSTED_MODE) of MSR 0x120 + * UCODE_PCR_POWER_MISC MSR to enter IA Untrusted Mode. + */ +void cpu_enable_untrusted_mode(void) +{ + msr_t msr; + + msr = rdmsr(MSR_POWER_MISC); + msr.lo |= ENABLE_IA_UNTRUSTED; + wrmsr(MSR_POWER_MISC, msr); +} |