Add the Intel FSP 206ax CPU core support

Add support for 206ax using the Intel FSP.
The FSP is different enough to warrant its own source files
for now. It has different CAR code, micorcode, and FSP inclusion.
It may be possible to combine this code with the mrc based
solution used by the chromebooks in the future.

Change-Id: I5105631af34e9c3a804ace908c4205f073abb9b4
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: http://review.coreboot.org/4016
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 433 insertions, 0 deletions

diff --git a/src/cpu/intel/fsp_model_206ax/model_206ax_init.c b/src/cpu/intel/fsp_model_206ax/model_206ax_init.c
new file mode 100644
index 0000000000..6eb4787353
--- /dev/null
+++ b/src/cpu/intel/fsp_model_206ax/model_206ax_init.c
@@ -0,0 +1,433 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <string.h>
+#include <arch/acpi.h>
+#include <cpu/cpu.h>
+#include <cpu/x86/mtrr.h>
+#include <cpu/x86/msr.h>
+#include <cpu/x86/lapic.h>
+#include <cpu/intel/speedstep.h>
+#include <cpu/intel/turbo.h>
+#include <cpu/x86/cache.h>
+#include <cpu/x86/name.h>
+#include <pc80/mc146818rtc.h>
+#include <usbdebug.h>
+#include "model_206ax.h"
+#include "chip.h"
+
+static void enable_vmx(void)
+{
+	struct cpuid_result regs;
+	msr_t msr;
+	int enable = CONFIG_ENABLE_VMX;
+
+	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 = rdmsr(IA32_FEATURE_CONTROL);
+
+	if (msr.lo & (1 << 0)) {
+		printk(BIOS_ERR, "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 = msr.lo = 0;
+
+	printk(BIOS_DEBUG, "%s VMX\n", enable ? "Enabling" : "Disabling");
+
+	if (enable) {
+			msr.lo |= (1 << 2);
+			if (regs.ecx & CPUID_SMX)
+				msr.lo |= (1 << 1);
+	}
+
+	wrmsr(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)
+{
+	msr_t platform_info;
+
+	/* Minimum CPU revision */
+	if (cpuid_eax(1) < IVB_CONFIG_TDP_MIN_CPUID)
+		return 0;
+
+	/* Bits 34:33 indicate how many levels supported */
+	platform_info = rdmsr(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 = rdmsr(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 = rdmsr(MSR_PKG_POWER_SKU_UNIT);
+	power_unit = 2 << ((msr.lo & 0xf) - 1);
+
+	/* Get power defaults for this SKU */
+	msr = rdmsr(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;
+
+	printk(BIOS_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 */
+
+	wrmsr(MSR_PKG_POWER_LIMIT, limit);
+
+	/* Use nominal TDP values for CPUs with configurable TDP */
+	if (cpu_config_tdp_levels()) {
+		msr = rdmsr(MSR_CONFIG_TDP_NOMINAL);
+		limit.hi = 0;
+		limit.lo = msr.lo & 0xff;
+		wrmsr(MSR_TURBO_ACTIVATION_RATIO, limit);
+	}
+}
+
+static void configure_misc(void)
+{
+	msr_t msr;
+
+	msr = rdmsr(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 */
+	wrmsr(IA32_MISC_ENABLE, msr);
+
+	/* 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);
+}
+
+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)
+{
+	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 = rdmsr(IA32_PLATFORM_DCA_CAP);
+		msr.lo |= 1;
+		wrmsr(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 = rdmsr(MSR_CONFIG_TDP_NOMINAL);
+		perf_ctl.lo = (msr.lo & 0xff) << 8;
+	} else {
+		/* Platform Info bits 15:8 give max ratio */
+		msr = rdmsr(MSR_PLATFORM_INFO);
+		perf_ctl.lo = msr.lo & 0xff00;
+	}
+	wrmsr(IA32_PERF_CTL, perf_ctl);
+
+	printk(BIOS_DEBUG, "model_x06ax: frequency set to %d\n",
+	       ((perf_ctl.lo >> 8) & 0xff) * SANDYBRIDGE_BCLK);
+}
+
+static void configure_mca(void)
+{
+	msr_t msr;
+	int i;
+
+	msr.lo = msr.hi = 0;
+	/* This should only be done on a cold boot */
+	for (i = 0; i < 7; i++)
+		wrmsr(IA32_MC0_STATUS + (i * 4), msr);
+}
+
+#if CONFIG_USBDEBUG
+static unsigned ehci_debug_addr;
+#endif
+
+/*
+ * Initialize any extra cores/threads in this package.
+ */
+static void intel_cores_init(device_t 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;
+
+	/* Only initialize extra cores from BSP */
+	if (cpu->path.apic.apic_id)
+		return;
+
+	printk(BIOS_DEBUG, "CPU: %u has %u cores, %u threads per core\n",
+	       cpu->path.apic.apic_id, threads_per_package/threads_per_core,
+	       threads_per_core);
+
+	for (i = 1; i < threads_per_package; ++i) {
+		struct device_path cpu_path;
+		device_t new;
+
+		/* Build the cpu device path */
+		cpu_path.type = DEVICE_PATH_APIC;
+		cpu_path.apic.apic_id =
+			cpu->path.apic.apic_id + i;
+
+		/* Update APIC ID if no hyperthreading */
+		if (threads_per_core == 1)
+			cpu_path.apic.apic_id <<= 1;
+
+		/* Allocate the new cpu device structure */
+		new = alloc_dev(cpu->bus, &cpu_path);
+		if (!new)
+			continue;
+
+		printk(BIOS_DEBUG, "CPU: %u has core %u\n",
+		       cpu->path.apic.apic_id,
+		       new->path.apic.apic_id);
+
+#if CONFIG_SMP && CONFIG_MAX_CPUS > 1
+		/* Start the new cpu */
+		if (!start_cpu(new)) {
+			/* Record the error in cpu? */
+			printk(BIOS_ERR, "CPU %u would not start!\n",
+			       new->path.apic.apic_id);
+		}
+#endif
+	}
+}
+
+static void model_206ax_init(device_t cpu)
+{
+	char processor_name[49];
+	struct cpuid_result cpuid_regs;
+
+	/* Turn on caching if we haven't already */
+	x86_enable_cache();
+
+	/* Clear out pending MCEs */
+	configure_mca();
+
+	/* Print processor name */
+	fill_processor_name(processor_name);
+	printk(BIOS_INFO, "CPU: %s.\n", processor_name);
+
+#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 */
+	cpuid_regs = cpuid(0x80000008);
+	x86_setup_fixed_mtrrs();
+	x86_setup_var_mtrrs(cpuid_regs.eax & 0xff, 2);
+	x86_mtrr_check();
+
+	/* Setup Page Attribute Tables (PAT) */
+	// TODO set up PAT
+
+#if CONFIG_USBDEBUG
+	set_ehci_debug(ehci_debug_addr);
+#endif
+
+	/* Enable the local cpu apics */
+	enable_lapic_tpr();
+	setup_lapic();
+
+	/* Enable virtualization if enabled in CMOS */
+	enable_vmx();
+
+	/* Configure Enhanced SpeedStep and Thermal Sensors */
+	configure_misc();
+
+	/* Enable Direct Cache Access */
+	configure_dca_cap();
+
+	/* Set Max Ratio */
+	set_max_ratio();
+
+	/* Enable Turbo */
+	enable_turbo();
+
+	/* Start up extra cores */
+	intel_cores_init(cpu);
+}
+
+static struct device_operations cpu_dev_ops = {
+	.init     = model_206ax_init,
+};
+
+static struct cpu_device_id cpu_table[] = {
+	{ X86_VENDOR_INTEL, 0x206a0 }, /* Intel Sandybridge */
+	{ X86_VENDOR_INTEL, 0x206a6 }, /* Intel Sandybridge D1 */
+	{ X86_VENDOR_INTEL, 0x206a7 }, /* Intel Sandybridge D2/J1 */
+	{ X86_VENDOR_INTEL, 0x306a0 }, /* Intel IvyBridge */
+	{ X86_VENDOR_INTEL, 0x306a2 }, /* Intel IvyBridge */
+	{ X86_VENDOR_INTEL, 0x306a4 }, /* Intel IvyBridge */
+	{ X86_VENDOR_INTEL, 0x306a5 }, /* Intel IvyBridge */
+	{ X86_VENDOR_INTEL, 0x306a6 }, /* Intel IvyBridge */
+	{ X86_VENDOR_INTEL, 0x306a8 }, /* Intel IvyBridge */
+	{ X86_VENDOR_INTEL, 0x306a9 }, /* Intel IvyBridge */
+	{ 0, 0 },
+};
+
+static const struct cpu_driver driver __cpu_driver = {
+	.ops      = &cpu_dev_ops,
+	.id_table = cpu_table,
+};
+