--- /dev/null
+/*
+ * From Coreboot file of same name
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2011 The Chromium Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <asm/acpi.h>
+#include <asm/cpu.h>
+#include <asm/lapic.h>
+#include <asm/lapic_def.h>
+#include <asm/msr.h>
+#include <asm/mtrr.h>
+#include <asm/processor.h>
+#include <asm/speedstep.h>
+#include <asm/turbo.h>
+#include <asm/arch/model_206ax.h>
+
+static void enable_vmx(void)
+{
+ struct cpuid_result regs;
+#ifdef CONFIG_ENABLE_VMX
+ int enable = true;
+#else
+ int enable = false;
+#endif
+ msr_t msr;
+
+ regs = cpuid(1);
+ /* Check that the VMX is supported before reading or writing the MSR. */
+ if (!((regs.ecx & CPUID_VMX) || (regs.ecx & CPUID_SMX)))
+ return;
+
+ msr = msr_read(MSR_IA32_FEATURE_CONTROL);
+
+ if (msr.lo & (1 << 0)) {
+ debug("VMX is locked, so %s will do nothing\n", __func__);
+ /* VMX locked. If we set it again we get an illegal
+ * instruction
+ */
+ return;
+ }
+
+ /* The IA32_FEATURE_CONTROL MSR may initialize with random values.
+ * It must be cleared regardless of VMX config setting.
+ */
+ msr.hi = 0;
+ msr.lo = 0;
+
+ debug("%s VMX\n", enable ? "Enabling" : "Disabling");
+
+ /*
+ * Even though the Intel manual says you must set the lock bit in
+ * addition to the VMX bit in order for VMX to work, it is incorrect.
+ * Thus we leave it unlocked for the OS to manage things itself.
+ * This is good for a few reasons:
+ * - No need to reflash the bios just to toggle the lock bit.
+ * - The VMX bits really really should match each other across cores,
+ * so hard locking it on one while another has the opposite setting
+ * can easily lead to crashes as code using VMX migrates between
+ * them.
+ * - Vendors that want to "upsell" from a bios that disables+locks to
+ * one that doesn't is sleazy.
+ * By leaving this to the OS (e.g. Linux), people can do exactly what
+ * they want on the fly, and do it correctly (e.g. across multiple
+ * cores).
+ */
+ if (enable) {
+ msr.lo |= (1 << 2);
+ if (regs.ecx & CPUID_SMX)
+ msr.lo |= (1 << 1);
+ }
+
+ msr_write(MSR_IA32_FEATURE_CONTROL, msr);
+}
+
+/* Convert time in seconds to POWER_LIMIT_1_TIME MSR value */
+static const u8 power_limit_time_sec_to_msr[] = {
+ [0] = 0x00,
+ [1] = 0x0a,
+ [2] = 0x0b,
+ [3] = 0x4b,
+ [4] = 0x0c,
+ [5] = 0x2c,
+ [6] = 0x4c,
+ [7] = 0x6c,
+ [8] = 0x0d,
+ [10] = 0x2d,
+ [12] = 0x4d,
+ [14] = 0x6d,
+ [16] = 0x0e,
+ [20] = 0x2e,
+ [24] = 0x4e,
+ [28] = 0x6e,
+ [32] = 0x0f,
+ [40] = 0x2f,
+ [48] = 0x4f,
+ [56] = 0x6f,
+ [64] = 0x10,
+ [80] = 0x30,
+ [96] = 0x50,
+ [112] = 0x70,
+ [128] = 0x11,
+};
+
+/* Convert POWER_LIMIT_1_TIME MSR value to seconds */
+static const u8 power_limit_time_msr_to_sec[] = {
+ [0x00] = 0,
+ [0x0a] = 1,
+ [0x0b] = 2,
+ [0x4b] = 3,
+ [0x0c] = 4,
+ [0x2c] = 5,
+ [0x4c] = 6,
+ [0x6c] = 7,
+ [0x0d] = 8,
+ [0x2d] = 10,
+ [0x4d] = 12,
+ [0x6d] = 14,
+ [0x0e] = 16,
+ [0x2e] = 20,
+ [0x4e] = 24,
+ [0x6e] = 28,
+ [0x0f] = 32,
+ [0x2f] = 40,
+ [0x4f] = 48,
+ [0x6f] = 56,
+ [0x10] = 64,
+ [0x30] = 80,
+ [0x50] = 96,
+ [0x70] = 112,
+ [0x11] = 128,
+};
+
+int cpu_config_tdp_levels(void)
+{
+ struct cpuid_result result;
+ msr_t platform_info;
+
+ /* Minimum CPU revision */
+ result = cpuid(1);
+ if (result.eax < IVB_CONFIG_TDP_MIN_CPUID)
+ return 0;
+
+ /* Bits 34:33 indicate how many levels supported */
+ platform_info = msr_read(MSR_PLATFORM_INFO);
+ return (platform_info.hi >> 1) & 3;
+}
+
+/*
+ * Configure processor power limits if possible
+ * This must be done AFTER set of BIOS_RESET_CPL
+ */
+void set_power_limits(u8 power_limit_1_time)
+{
+ msr_t msr = msr_read(MSR_PLATFORM_INFO);
+ msr_t limit;
+ unsigned power_unit;
+ unsigned tdp, min_power, max_power, max_time;
+ u8 power_limit_1_val;
+
+ if (power_limit_1_time > ARRAY_SIZE(power_limit_time_sec_to_msr))
+ return;
+
+ if (!(msr.lo & PLATFORM_INFO_SET_TDP))
+ return;
+
+ /* Get units */
+ msr = msr_read(MSR_PKG_POWER_SKU_UNIT);
+ power_unit = 2 << ((msr.lo & 0xf) - 1);
+
+ /* Get power defaults for this SKU */
+ msr = msr_read(MSR_PKG_POWER_SKU);
+ tdp = msr.lo & 0x7fff;
+ min_power = (msr.lo >> 16) & 0x7fff;
+ max_power = msr.hi & 0x7fff;
+ max_time = (msr.hi >> 16) & 0x7f;
+
+ debug("CPU TDP: %u Watts\n", tdp / power_unit);
+
+ if (power_limit_time_msr_to_sec[max_time] > power_limit_1_time)
+ power_limit_1_time = power_limit_time_msr_to_sec[max_time];
+
+ if (min_power > 0 && tdp < min_power)
+ tdp = min_power;
+
+ if (max_power > 0 && tdp > max_power)
+ tdp = max_power;
+
+ power_limit_1_val = power_limit_time_sec_to_msr[power_limit_1_time];
+
+ /* Set long term power limit to TDP */
+ limit.lo = 0;
+ limit.lo |= tdp & PKG_POWER_LIMIT_MASK;
+ limit.lo |= PKG_POWER_LIMIT_EN;
+ limit.lo |= (power_limit_1_val & PKG_POWER_LIMIT_TIME_MASK) <<
+ PKG_POWER_LIMIT_TIME_SHIFT;
+
+ /* Set short term power limit to 1.25 * TDP */
+ limit.hi = 0;
+ limit.hi |= ((tdp * 125) / 100) & PKG_POWER_LIMIT_MASK;
+ limit.hi |= PKG_POWER_LIMIT_EN;
+ /* Power limit 2 time is only programmable on SNB EP/EX */
+
+ msr_write(MSR_PKG_POWER_LIMIT, limit);
+
+ /* Use nominal TDP values for CPUs with configurable TDP */
+ if (cpu_config_tdp_levels()) {
+ msr = msr_read(MSR_CONFIG_TDP_NOMINAL);
+ limit.hi = 0;
+ limit.lo = msr.lo & 0xff;
+ msr_write(MSR_TURBO_ACTIVATION_RATIO, limit);
+ }
+}
+
+static void configure_c_states(void)
+{
+ struct cpuid_result result;
+ msr_t msr;
+
+ msr = msr_read(MSR_PMG_CST_CONFIG_CTL);
+ msr.lo |= (1 << 28); /* C1 Auto Undemotion Enable */
+ msr.lo |= (1 << 27); /* C3 Auto Undemotion Enable */
+ msr.lo |= (1 << 26); /* C1 Auto Demotion Enable */
+ msr.lo |= (1 << 25); /* C3 Auto Demotion Enable */
+ msr.lo &= ~(1 << 10); /* Disable IO MWAIT redirection */
+ msr.lo |= 7; /* No package C-state limit */
+ msr_write(MSR_PMG_CST_CONFIG_CTL, msr);
+
+ msr = msr_read(MSR_PMG_IO_CAPTURE_ADR);
+ msr.lo &= ~0x7ffff;
+ msr.lo |= (PMB0_BASE + 4); /* LVL_2 base address */
+ msr.lo |= (2 << 16); /* CST Range: C7 is max C-state */
+ msr_write(MSR_PMG_IO_CAPTURE_ADR, msr);
+
+ msr = msr_read(MSR_MISC_PWR_MGMT);
+ msr.lo &= ~(1 << 0); /* Enable P-state HW_ALL coordination */
+ msr_write(MSR_MISC_PWR_MGMT, msr);
+
+ msr = msr_read(MSR_POWER_CTL);
+ msr.lo |= (1 << 18); /* Enable Energy Perf Bias MSR 0x1b0 */
+ msr.lo |= (1 << 1); /* C1E Enable */
+ msr.lo |= (1 << 0); /* Bi-directional PROCHOT# */
+ msr_write(MSR_POWER_CTL, msr);
+
+ /* C3 Interrupt Response Time Limit */
+ msr.hi = 0;
+ msr.lo = IRTL_VALID | IRTL_1024_NS | 0x50;
+ msr_write(MSR_PKGC3_IRTL, msr);
+
+ /* C6 Interrupt Response Time Limit */
+ msr.hi = 0;
+ msr.lo = IRTL_VALID | IRTL_1024_NS | 0x68;
+ msr_write(MSR_PKGC6_IRTL, msr);
+
+ /* C7 Interrupt Response Time Limit */
+ msr.hi = 0;
+ msr.lo = IRTL_VALID | IRTL_1024_NS | 0x6D;
+ msr_write(MSR_PKGC7_IRTL, msr);
+
+ /* Primary Plane Current Limit */
+ msr = msr_read(MSR_PP0_CURRENT_CONFIG);
+ msr.lo &= ~0x1fff;
+ msr.lo |= PP0_CURRENT_LIMIT;
+ msr_write(MSR_PP0_CURRENT_CONFIG, msr);
+
+ /* Secondary Plane Current Limit */
+ msr = msr_read(MSR_PP1_CURRENT_CONFIG);
+ msr.lo &= ~0x1fff;
+ result = cpuid(1);
+ if (result.eax >= 0x30600)
+ msr.lo |= PP1_CURRENT_LIMIT_IVB;
+ else
+ msr.lo |= PP1_CURRENT_LIMIT_SNB;
+ msr_write(MSR_PP1_CURRENT_CONFIG, msr);
+}
+
+static int configure_thermal_target(void)
+{
+ int tcc_offset;
+ msr_t msr;
+ int node;
+
+ /* Find pointer to CPU configuration */
+ node = fdtdec_next_compatible(gd->fdt_blob, 0,
+ COMPAT_INTEL_MODEL_206AX);
+ if (node < 0)
+ return -ENOENT;
+ tcc_offset = fdtdec_get_int(gd->fdt_blob, node, "tcc-offset", 0);
+
+ /* Set TCC activaiton offset if supported */
+ msr = msr_read(MSR_PLATFORM_INFO);
+ if ((msr.lo & (1 << 30)) && tcc_offset) {
+ msr = msr_read(MSR_TEMPERATURE_TARGET);
+ msr.lo &= ~(0xf << 24); /* Bits 27:24 */
+ msr.lo |= (tcc_offset & 0xf) << 24;
+ msr_write(MSR_TEMPERATURE_TARGET, msr);
+ }
+
+ return 0;
+}
+
+static void configure_misc(void)
+{
+ msr_t msr;
+
+ msr = msr_read(IA32_MISC_ENABLE);
+ msr.lo |= (1 << 0); /* Fast String enable */
+ msr.lo |= (1 << 3); /* TM1/TM2/EMTTM enable */
+ msr.lo |= (1 << 16); /* Enhanced SpeedStep Enable */
+ msr_write(IA32_MISC_ENABLE, msr);
+
+ /* Disable Thermal interrupts */
+ msr.lo = 0;
+ msr.hi = 0;
+ msr_write(IA32_THERM_INTERRUPT, msr);
+
+ /* Enable package critical interrupt only */
+ msr.lo = 1 << 4;
+ msr.hi = 0;
+ msr_write(IA32_PACKAGE_THERM_INTERRUPT, msr);
+}
+
+static void enable_lapic_tpr(void)
+{
+ msr_t msr;
+
+ msr = msr_read(MSR_PIC_MSG_CONTROL);
+ msr.lo &= ~(1 << 10); /* Enable APIC TPR updates */
+ msr_write(MSR_PIC_MSG_CONTROL, msr);
+}
+
+static void configure_dca_cap(void)
+{
+ struct cpuid_result cpuid_regs;
+ msr_t msr;
+
+ /* Check feature flag in CPUID.(EAX=1):ECX[18]==1 */
+ cpuid_regs = cpuid(1);
+ if (cpuid_regs.ecx & (1 << 18)) {
+ msr = msr_read(IA32_PLATFORM_DCA_CAP);
+ msr.lo |= 1;
+ msr_write(IA32_PLATFORM_DCA_CAP, msr);
+ }
+}
+
+static void set_max_ratio(void)
+{
+ msr_t msr, perf_ctl;
+
+ perf_ctl.hi = 0;
+
+ /* Check for configurable TDP option */
+ if (cpu_config_tdp_levels()) {
+ /* Set to nominal TDP ratio */
+ msr = msr_read(MSR_CONFIG_TDP_NOMINAL);
+ perf_ctl.lo = (msr.lo & 0xff) << 8;
+ } else {
+ /* Platform Info bits 15:8 give max ratio */
+ msr = msr_read(MSR_PLATFORM_INFO);
+ perf_ctl.lo = msr.lo & 0xff00;
+ }
+ msr_write(IA32_PERF_CTL, perf_ctl);
+
+ debug("model_x06ax: frequency set to %d\n",
+ ((perf_ctl.lo >> 8) & 0xff) * SANDYBRIDGE_BCLK);
+}
+
+static void set_energy_perf_bias(u8 policy)
+{
+ msr_t msr;
+
+ /* Energy Policy is bits 3:0 */
+ msr = msr_read(IA32_ENERGY_PERFORMANCE_BIAS);
+ msr.lo &= ~0xf;
+ msr.lo |= policy & 0xf;
+ msr_write(IA32_ENERGY_PERFORMANCE_BIAS, msr);
+
+ debug("model_x06ax: energy policy set to %u\n", policy);
+}
+
+static void configure_mca(void)
+{
+ msr_t msr;
+ int i;
+
+ msr.lo = 0;
+ msr.hi = 0;
+ /* This should only be done on a cold boot */
+ for (i = 0; i < 7; i++)
+ msr_write(IA32_MC0_STATUS + (i * 4), msr);
+}
+
+#if CONFIG_USBDEBUG
+static unsigned ehci_debug_addr;
+#endif
+
+/*
+ * Initialize any extra cores/threads in this package.
+ */
+static int intel_cores_init(struct x86_cpu_priv *cpu)
+{
+ struct cpuid_result result;
+ unsigned threads_per_package, threads_per_core, i;
+
+ /* Logical processors (threads) per core */
+ result = cpuid_ext(0xb, 0);
+ threads_per_core = result.ebx & 0xffff;
+
+ /* Logical processors (threads) per package */
+ result = cpuid_ext(0xb, 1);
+ threads_per_package = result.ebx & 0xffff;
+
+ debug("CPU: %u has %u cores, %u threads per core\n",
+ cpu->apic_id, threads_per_package / threads_per_core,
+ threads_per_core);
+
+ for (i = 1; i < threads_per_package; ++i) {
+ struct x86_cpu_priv *new_cpu;
+
+ new_cpu = calloc(1, sizeof(*new_cpu));
+ if (!new_cpu)
+ return -ENOMEM;
+
+ new_cpu->apic_id = cpu->apic_id + i;
+
+ /* Update APIC ID if no hyperthreading */
+ if (threads_per_core == 1)
+ new_cpu->apic_id <<= 1;
+
+ debug("CPU: %u has core %u\n", cpu->apic_id, new_cpu->apic_id);
+
+#if CONFIG_SMP && CONFIG_MAX_CPUS > 1
+ /* Start the new cpu */
+ if (!start_cpu(new_cpu)) {
+ /* Record the error in cpu? */
+ printk(BIOS_ERR, "CPU %u would not start!\n",
+ new_cpu->apic_id);
+ new_cpu->start_err = 1;
+ }
+#endif
+ }
+
+ return 0;
+}
+
+int model_206ax_init(struct x86_cpu_priv *cpu)
+{
+ int ret;
+
+ /* Clear out pending MCEs */
+ configure_mca();
+
+#if CONFIG_USBDEBUG
+ /* Is this caution really needed? */
+ if (!ehci_debug_addr)
+ ehci_debug_addr = get_ehci_debug();
+ set_ehci_debug(0);
+#endif
+
+ /* Setup MTRRs based on physical address size */
+#if 0 /* TODO: Implement this */
+ struct cpuid_result cpuid_regs;
+
+ cpuid_regs = cpuid(0x80000008);
+ x86_setup_fixed_mtrrs();
+ x86_setup_var_mtrrs(cpuid_regs.eax & 0xff, 2);
+ x86_mtrr_check();
+#endif
+
+#if CONFIG_USBDEBUG
+ set_ehci_debug(ehci_debug_addr);
+#endif
+
+ /* Enable the local cpu apics */
+ enable_lapic_tpr();
+ lapic_setup();
+
+ /* Enable virtualization if enabled in CMOS */
+ enable_vmx();
+
+ /* Configure C States */
+ configure_c_states();
+
+ /* Configure Enhanced SpeedStep and Thermal Sensors */
+ configure_misc();
+
+ /* Thermal throttle activation offset */
+ ret = configure_thermal_target();
+ if (ret)
+ return ret;
+
+ /* Enable Direct Cache Access */
+ configure_dca_cap();
+
+ /* Set energy policy */
+ set_energy_perf_bias(ENERGY_POLICY_NORMAL);
+
+ /* Set Max Ratio */
+ set_max_ratio();
+
+ /* Enable Turbo */
+ turbo_enable();
+
+ /* Start up extra cores */
+ intel_cores_init(cpu);
+
+ return 0;
+}
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