x86: Add init for model 206AX CPU

Add the setup code for the CPU so that it can be used at full speed.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/ivybridge/Makefile

@@ -11,6 +11,7 @@ obj-y += early_init.o
 obj-y += early_me.o
 obj-y += lpc.o
 obj-y += me_status.o
+obj-y += model_206ax.o
 obj-y += microcode_intel.o
 obj-y += pch.o
 obj-y += pci.o

arch/x86/cpu/ivybridge/bd82x6x.c

@@ -90,6 +90,7 @@ int bd82x6x_init_pci_devices(void)
 {
 	const void *blob = gd->fdt_blob;
 	struct pci_controller *hose;
+	struct x86_cpu_priv *cpu;
 	int sata_node;
 
 	hose = pci_bus_to_hose(0);
@@ -105,6 +106,11 @@ int bd82x6x_init_pci_devices(void)
 	bd82x6x_usb_ehci_init(PCH_EHCI1_DEV);
 	bd82x6x_usb_ehci_init(PCH_EHCI2_DEV);
 
+	cpu = calloc(1, sizeof(*cpu));
+	if (!cpu)
+		return -ENOMEM;
+	model_206ax_init(cpu);
+
 	return 0;
 }
 

arch/x86/cpu/ivybridge/model_206ax.c

+/*
+ * 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;
+}

arch/x86/include/asm/arch-ivybridge/bd82x6x.h

@@ -15,4 +15,7 @@ void bd82x6x_usb_xhci_init(pci_dev_t dev);
 int bd82x6x_init_pci_devices(void);
 int bd82x6x_init(void);
 
+struct x86_cpu_priv;
+int model_206ax_init(struct x86_cpu_priv *cpu);
+
 #endif

arch/x86/include/asm/msr-index.h

@@ -326,6 +326,8 @@
 #define MSR_AMD_PERF_STATUS		0xc0010063
 #define MSR_AMD_PERF_CTL		0xc0010062
 
+#define MSR_PMG_CST_CONFIG_CTL		0x000000e2
+#define MSR_PMG_IO_CAPTURE_ADR		0x000000e4
 #define MSR_IA32_MPERF			0x000000e7
 #define MSR_IA32_APERF			0x000000e8
 

include/fdtdec.h

@@ -121,6 +121,7 @@ enum fdt_compat_id {
 	COMPAT_INTEL_MICROCODE,		/* Intel microcode update */
 	COMPAT_MEMORY_SPD,		/* Memory SPD information */
 	COMPAT_INTEL_PANTHERPOINT_AHCI,	/* Intel Pantherpoint AHCI */
+	COMPAT_INTEL_MODEL_206AX,	/* Intel Model 206AX CPU */
 
 	COMPAT_COUNT,
 };

lib/fdtdec.c

@@ -76,6 +76,7 @@ static const char * const compat_names[COMPAT_COUNT] = {
 	COMPAT(INTEL_MICROCODE, "intel,microcode"),
 	COMPAT(MEMORY_SPD, "memory-spd"),
 	COMPAT(INTEL_PANTHERPOINT_AHCI, "intel,pantherpoint-ahci"),
+	COMPAT(INTEL_MODEL_206AX, "intel,model-206ax"),
 };
 
 const char *fdtdec_get_compatible(enum fdt_compat_id id)