diff options
Diffstat (limited to 'src/soc/intel/elkhartlake/cpu.c')
| -rw-r--r-- | src/soc/intel/elkhartlake/cpu.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/src/soc/intel/elkhartlake/cpu.c b/src/soc/intel/elkhartlake/cpu.c new file mode 100644 index 0000000000..382bbf7b01 --- /dev/null +++ b/src/soc/intel/elkhartlake/cpu.c @@ -0,0 +1,213 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <arch/cpu.h> +#include <console/console.h> +#include <cpu/intel/smm_reloc.h> +#include <cpu/intel/turbo.h> +#include <cpu/x86/lapic.h> +#include <cpu/x86/mp.h> +#include <cpu/x86/msr.h> +#include <device/pci.h> +#include <fsp/api.h> +#include <intelblocks/cpulib.h> +#include <intelblocks/mp_init.h> +#include <intelblocks/msr.h> +#include <romstage_handoff.h> +#include <soc/cpu.h> +#include <soc/msr.h> +#include <soc/pci_devs.h> +#include <soc/pm.h> +#include <soc/soc_chip.h> + +static void soc_fsp_load(void) +{ + fsps_load(romstage_handoff_is_resume()); +} + +static void configure_isst(void) +{ + config_t *conf = config_of_soc(); + msr_t msr; + + if (conf->speed_shift_enable) { + /* + * Kernel driver checks CPUID.06h:EAX[Bit 7] to determine if HWP + * is supported or not. coreboot needs to configure MSR 0x1AA + * which is then reflected in the CPUID register. + */ + msr = rdmsr(MSR_MISC_PWR_MGMT); + msr.lo |= MISC_PWR_MGMT_ISST_EN; /* Enable Speed Shift */ + msr.lo |= MISC_PWR_MGMT_ISST_EN_INT; /* Enable Interrupt */ + msr.lo |= MISC_PWR_MGMT_ISST_EN_EPP; /* Enable EPP */ + wrmsr(MSR_MISC_PWR_MGMT, msr); + } else { + msr = rdmsr(MSR_MISC_PWR_MGMT); + msr.lo &= ~MISC_PWR_MGMT_ISST_EN; /* Disable Speed Shift */ + msr.lo &= ~MISC_PWR_MGMT_ISST_EN_INT; /* Disable Interrupt */ + msr.lo &= ~MISC_PWR_MGMT_ISST_EN_EPP; /* Disable EPP */ + wrmsr(MSR_MISC_PWR_MGMT, msr); + } +} + +static void configure_misc(void) +{ + msr_t msr; + + config_t *conf = config_of_soc(); + + msr = rdmsr(IA32_MISC_ENABLE); + msr.lo |= (1 << 0); /* Fast String enable */ + msr.lo |= (1 << 3); /* TM1/TM2/EMTTM enable */ + wrmsr(IA32_MISC_ENABLE, msr); + + /* Set EIST status */ + cpu_set_eist(conf->eist_enable); + + /* Disable Thermal interrupts */ + msr.lo = 0; + msr.hi = 0; + wrmsr(IA32_THERM_INTERRUPT, msr); + + /* Enable package critical interrupt only */ + msr.lo = 1 << 4; + msr.hi = 0; + wrmsr(IA32_PACKAGE_THERM_INTERRUPT, msr); + + /* Enable PROCHOT */ + msr = rdmsr(MSR_POWER_CTL); + msr.lo |= (1 << 0); /* Enable Bi-directional PROCHOT as an input*/ + msr.lo |= (1 << 23); /* Lock it */ + wrmsr(MSR_POWER_CTL, msr); +} + +static void enable_lapic_tpr(void) +{ + msr_t msr; + + msr = rdmsr(MSR_PIC_MSG_CONTROL); + msr.lo &= ~(1 << 10); /* Enable APIC TPR updates */ + wrmsr(MSR_PIC_MSG_CONTROL, msr); +} + +static void configure_dca_cap(void) +{ + uint32_t feature_flag; + msr_t msr; + + /* Check feature flag in CPUID.(EAX=1):ECX[18]==1 */ + feature_flag = cpu_get_feature_flags_ecx(); + if (feature_flag & CPUID_DCA) { + msr = rdmsr(IA32_PLATFORM_DCA_CAP); + msr.lo |= 1; + wrmsr(IA32_PLATFORM_DCA_CAP, msr); + } +} + +static void enable_pm_timer_emulation(void) +{ + /* ACPI PM timer emulation */ + msr_t msr; + /* + * The derived frequency is calculated as follows: + * (CTC_FREQ * msr[63:32]) >> 32 = target frequency. + * Back solve the multiplier so the 3.579545MHz ACPI timer + * frequency is used. + */ + msr.hi = (3579545ULL << 32) / CTC_FREQ; + /* Set PM1 timer IO port and enable */ + msr.lo = (EMULATE_DELAY_VALUE << EMULATE_DELAY_OFFSET_VALUE) | + EMULATE_PM_TMR_EN | (ACPI_BASE_ADDRESS + PM1_TMR); + wrmsr(MSR_EMULATE_PM_TIMER, msr); +} + +static void set_energy_perf_bias(u8 policy) +{ + msr_t msr; + int ecx; + + /* Determine if energy efficient policy is supported. */ + ecx = cpuid_ecx(0x6); + if (!(ecx & (1 << 3))) + return; + + /* Energy Policy is bits 3:0 */ + msr = rdmsr(IA32_ENERGY_PERF_BIAS); + msr.lo &= ~0xf; + msr.lo |= policy & 0xf; + wrmsr(IA32_ENERGY_PERF_BIAS, msr); +} + +/* All CPUs including BSP will run the following function. */ +void soc_core_init(struct device *cpu) +{ + /* Clear out pending MCEs */ + /* TODO(adurbin): This should only be done on a cold boot. Also, some + * of these banks are core vs package scope. For now every CPU clears + * every bank. */ + mca_configure(); + + /* Enable the local CPU apics */ + enable_lapic_tpr(); + setup_lapic(); + + /* Configure Enhanced SpeedStep and Thermal Sensors */ + configure_misc(); + + /* Configure Intel Speed Shift */ + configure_isst(); + + /* Enable PM timer emulation */ + enable_pm_timer_emulation(); + + /* Enable Direct Cache Access */ + configure_dca_cap(); + + /* Set energy policy */ + set_energy_perf_bias(ENERGY_POLICY_NORMAL); + + /* Enable Turbo */ + enable_turbo(); +} + +static void per_cpu_smm_trigger(void) +{ + /* Relocate the SMM handler. */ + smm_relocate(); +} + +static void post_mp_init(void) +{ + /* Set Max Ratio */ + cpu_set_max_ratio(); + + /* + * Now that all APs have been relocated as well as the BSP let SMIs + * start flowing. + */ + global_smi_enable(); +} + +static const struct mp_ops mp_ops = { + /* + * Skip Pre MP init MTRR programming as MTRRs are mirrored from BSP, + * that are set prior to ramstage. + * Real MTRRs programming are being done after resource allocation. + */ + .pre_mp_init = soc_fsp_load, + .get_cpu_count = get_cpu_count, + .get_smm_info = smm_info, + .get_microcode_info = get_microcode_info, + .pre_mp_smm_init = smm_initialize, + .per_cpu_smm_trigger = per_cpu_smm_trigger, + .relocation_handler = smm_relocation_handler, + .post_mp_init = post_mp_init, +}; + +void soc_init_cpus(struct bus *cpu_bus) +{ + if (mp_init_with_smm(cpu_bus, &mp_ops)) + printk(BIOS_ERR, "MP initialization failure.\n"); + + /* Thermal throttle activation offset */ + configure_tcc_thermal_target(); +} |