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, 364 insertions, 0 deletions

diff --git a/src/cpu/intel/fsp_model_206ax/acpi.c b/src/cpu/intel/fsp_model_206ax/acpi.c
new file mode 100644
index 0000000000..47e651f2ee
--- /dev/null
+++ b/src/cpu/intel/fsp_model_206ax/acpi.c
@@ -0,0 +1,364 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2009 coresystems GmbH
+ * Copyright (C) 2011 The Chromium OS 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 <types.h>
+#include <console/console.h>
+#include <arch/acpi.h>
+#include <arch/acpigen.h>
+#include <arch/cpu.h>
+#include <cpu/x86/msr.h>
+#include <cpu/intel/speedstep.h>
+#include <cpu/intel/turbo.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include "model_206ax.h"
+#include "chip.h"
+
+static int get_cores_per_package(void)
+{
+	struct cpuinfo_x86 c;
+	struct cpuid_result result;
+	int cores = 1;
+
+	get_fms(&c, cpuid_eax(1));
+	if (c.x86 != 6)
+		return 1;
+
+	result = cpuid_ext(0xb, 1);
+	cores = result.ebx & 0xff;
+
+	return cores;
+}
+
+static int generate_cstate_entries(acpi_cstate_t *cstates,
+				   int c1, int c2, int c3)
+{
+	int length, cstate_count = 0;
+
+	/* Count number of active C-states */
+	if (c1 > 0)
+		++cstate_count;
+	if (c2 > 0)
+		++cstate_count;
+	if (c3 > 0)
+		++cstate_count;
+	if (!cstate_count)
+		return 0;
+
+	length = acpigen_write_package(cstate_count + 1);
+	length += acpigen_write_byte(cstate_count);
+
+	/* Add an entry if the level is enabled */
+	if (c1 > 0) {
+		cstates[c1].ctype = 1;
+		length += acpigen_write_CST_package_entry(&cstates[c1]);
+	}
+	if (c2 > 0) {
+		cstates[c2].ctype = 2;
+		length += acpigen_write_CST_package_entry(&cstates[c2]);
+	}
+	if (c3 > 0) {
+		cstates[c3].ctype = 3;
+		length += acpigen_write_CST_package_entry(&cstates[c3]);
+	}
+
+	acpigen_patch_len(length - 1);
+	return length;
+}
+
+static int generate_C_state_entries(void)
+{
+	struct cpu_info *info;
+	struct cpu_driver *cpu;
+	int len, lenif;
+	device_t lapic;
+	struct cpu_intel_fsp_model_206ax_config *conf = NULL;
+
+	/* Find the SpeedStep CPU in the device tree using magic APIC ID */
+	lapic = dev_find_lapic(SPEEDSTEP_APIC_MAGIC);
+	if (!lapic)
+		return 0;
+	conf = lapic->chip_info;
+	if (!conf)
+		return 0;
+
+	/* Find CPU map of supported C-states */
+	info = cpu_info();
+	if (!info)
+		return 0;
+	cpu = find_cpu_driver(info->cpu);
+	if (!cpu || !cpu->cstates)
+		return 0;
+
+	len = acpigen_emit_byte(0x14);		/* MethodOp */
+	len += acpigen_write_len_f();		/* PkgLength */
+	len += acpigen_emit_namestring("_CST");
+	len += acpigen_emit_byte(0x00);		/* No Arguments */
+
+	/* If running on AC power */
+	len += acpigen_emit_byte(0xa0);		/* IfOp */
+	lenif = acpigen_write_len_f();		/* PkgLength */
+	lenif += acpigen_emit_namestring("PWRS");
+	lenif += acpigen_emit_byte(0xa4);	/* ReturnOp */
+	lenif += generate_cstate_entries(cpu->cstates, conf->c1_acpower,
+					 conf->c2_acpower, conf->c3_acpower);
+	acpigen_patch_len(lenif - 1);
+	len += lenif;
+
+	/* Else on battery power */
+	len += acpigen_emit_byte(0xa4);	/* ReturnOp */
+	len += generate_cstate_entries(cpu->cstates, conf->c1_battery,
+					conf->c2_battery, conf->c3_battery);
+	acpigen_patch_len(len - 1);
+	return len;
+}
+
+static acpi_tstate_t tss_table_fine[] = {
+	{ 100, 1000, 0, 0x00, 0 },
+	{ 94, 940, 0, 0x1f, 0 },
+	{ 88, 880, 0, 0x1e, 0 },
+	{ 82, 820, 0, 0x1d, 0 },
+	{ 75, 760, 0, 0x1c, 0 },
+	{ 69, 700, 0, 0x1b, 0 },
+	{ 63, 640, 0, 0x1a, 0 },
+	{ 57, 580, 0, 0x19, 0 },
+	{ 50, 520, 0, 0x18, 0 },
+	{ 44, 460, 0, 0x17, 0 },
+	{ 38, 400, 0, 0x16, 0 },
+	{ 32, 340, 0, 0x15, 0 },
+	{ 25, 280, 0, 0x14, 0 },
+	{ 19, 220, 0, 0x13, 0 },
+	{ 13, 160, 0, 0x12, 0 },
+};
+
+static acpi_tstate_t tss_table_coarse[] = {
+	{ 100, 1000, 0, 0x00, 0 },
+	{ 88, 875, 0, 0x1f, 0 },
+	{ 75, 750, 0, 0x1e, 0 },
+	{ 63, 625, 0, 0x1d, 0 },
+	{ 50, 500, 0, 0x1c, 0 },
+	{ 38, 375, 0, 0x1b, 0 },
+	{ 25, 250, 0, 0x1a, 0 },
+	{ 13, 125, 0, 0x19, 0 },
+};
+
+static int generate_T_state_entries(int core, int cores_per_package)
+{
+	int len;
+
+	/* Indicate SW_ALL coordination for T-states */
+	len = acpigen_write_TSD_package(core, cores_per_package, SW_ALL);
+
+	/* Indicate FFixedHW so OS will use MSR */
+	len += acpigen_write_empty_PTC();
+
+	/* Set a T-state limit that can be modified in NVS */
+	len += acpigen_write_TPC("\\TLVL");
+
+	/*
+	 * CPUID.(EAX=6):EAX[5] indicates support
+	 * for extended throttle levels.
+	 */
+	if (cpuid_eax(6) & (1 << 5))
+		len += acpigen_write_TSS_package(
+			ARRAY_SIZE(tss_table_fine), tss_table_fine);
+	else
+		len += acpigen_write_TSS_package(
+			ARRAY_SIZE(tss_table_coarse), tss_table_coarse);
+
+	return len;
+}
+
+static int calculate_power(int tdp, int p1_ratio, int ratio)
+{
+	u32 m;
+	u32 power;
+
+	/*
+	 * M = ((1.1 - ((p1_ratio - ratio) * 0.00625)) / 1.1) ^ 2
+	 *
+	 * Power = (ratio / p1_ratio) * m * tdp
+	 */
+
+	m = (110000 - ((p1_ratio - ratio) * 625)) / 11;
+	m = (m * m) / 1000;
+
+	power = ((ratio * 100000 / p1_ratio) / 100);
+	power *= (m / 100) * (tdp / 1000);
+	power /= 1000;
+
+	return (int)power;
+}
+
+static int generate_P_state_entries(int core, int cores_per_package)
+{
+	int len, len_pss;
+	int ratio_min, ratio_max, ratio_turbo, ratio_step;
+	int coord_type, power_max, power_unit, num_entries;
+	int ratio, power, clock, clock_max;
+	msr_t msr;
+
+	/* Determine P-state coordination type from MISC_PWR_MGMT[0] */
+	msr = rdmsr(MSR_MISC_PWR_MGMT);
+	if (msr.lo & MISC_PWR_MGMT_EIST_HW_DIS)
+		coord_type = SW_ANY;
+	else
+		coord_type = HW_ALL;
+
+	/* Get bus ratio limits and calculate clock speeds */
+	msr = rdmsr(MSR_PLATFORM_INFO);
+	ratio_min = (msr.hi >> (40-32)) & 0xff; /* Max Efficiency Ratio */
+
+	/* Determine if this CPU has configurable TDP */
+	if (cpu_config_tdp_levels()) {
+		/* Set max ratio to nominal TDP ratio */
+		msr = rdmsr(MSR_CONFIG_TDP_NOMINAL);
+		ratio_max = msr.lo & 0xff;
+	} else {
+		/* Max Non-Turbo Ratio */
+		ratio_max = (msr.lo >> 8) & 0xff;
+	}
+	clock_max = ratio_max * SANDYBRIDGE_BCLK;
+
+	/* Calculate CPU TDP in mW */
+	msr = rdmsr(MSR_PKG_POWER_SKU_UNIT);
+	power_unit = 2 << ((msr.lo & 0xf) - 1);
+	msr = rdmsr(MSR_PKG_POWER_SKU);
+	power_max = ((msr.lo & 0x7fff) / power_unit) * 1000;
+
+	/* Write _PCT indicating use of FFixedHW */
+	len = acpigen_write_empty_PCT();
+
+	/* Write _PPC with no limit on supported P-state */
+	len += acpigen_write_PPC_NVS();
+
+	/* Write PSD indicating configured coordination type */
+	len += acpigen_write_PSD_package(core, cores_per_package, coord_type);
+
+	/* Add P-state entries in _PSS table */
+	len += acpigen_write_name("_PSS");
+
+	/* Determine ratio points */
+	ratio_step = PSS_RATIO_STEP;
+	num_entries = (ratio_max - ratio_min) / ratio_step;
+	while (num_entries > PSS_MAX_ENTRIES-1) {
+		ratio_step <<= 1;
+		num_entries >>= 1;
+	}
+
+	/* P[T] is Turbo state if enabled */
+	if (get_turbo_state() == TURBO_ENABLED) {
+		/* _PSS package count including Turbo */
+		len_pss = acpigen_write_package(num_entries + 2);
+
+		msr = rdmsr(MSR_TURBO_RATIO_LIMIT);
+		ratio_turbo = msr.lo & 0xff;
+
+		/* Add entry for Turbo ratio */
+		len_pss += acpigen_write_PSS_package(
+			clock_max + 1,		/*MHz*/
+			power_max,		/*mW*/
+			PSS_LATENCY_TRANSITION,	/*lat1*/
+			PSS_LATENCY_BUSMASTER,	/*lat2*/
+			ratio_turbo << 8,	/*control*/
+			ratio_turbo << 8);	/*status*/
+	} else {
+		/* _PSS package count without Turbo */
+		len_pss = acpigen_write_package(num_entries + 1);
+	}
+
+	/* First regular entry is max non-turbo ratio */
+	len_pss += acpigen_write_PSS_package(
+		clock_max,		/*MHz*/
+		power_max,		/*mW*/
+		PSS_LATENCY_TRANSITION,	/*lat1*/
+		PSS_LATENCY_BUSMASTER,	/*lat2*/
+		ratio_max << 8,		/*control*/
+		ratio_max << 8);	/*status*/
+
+	/* Generate the remaining entries */
+	for (ratio = ratio_min + ((num_entries - 1) * ratio_step);
+	     ratio >= ratio_min; ratio -= ratio_step) {
+
+		/* Calculate power at this ratio */
+		power = calculate_power(power_max, ratio_max, ratio);
+		clock = ratio * SANDYBRIDGE_BCLK;
+
+		len_pss += acpigen_write_PSS_package(
+			clock,			/*MHz*/
+			power,			/*mW*/
+			PSS_LATENCY_TRANSITION,	/*lat1*/
+			PSS_LATENCY_BUSMASTER,	/*lat2*/
+			ratio << 8,		/*control*/
+			ratio << 8);		/*status*/
+	}
+
+	/* Fix package length */
+	len_pss--;
+	acpigen_patch_len(len_pss);
+
+	return len + len_pss;
+}
+
+void generate_cpu_entries(void)
+{
+	int len_pr;
+	int coreID, cpuID, pcontrol_blk = PMB0_BASE, plen = 6;
+	int totalcores = dev_count_cpu();
+	int cores_per_package = get_cores_per_package();
+	int numcpus = totalcores/cores_per_package;
+
+	printk(BIOS_DEBUG, "Found %d CPU(s) with %d core(s) each.\n",
+	       numcpus, cores_per_package);
+
+	for (cpuID=1; cpuID <=numcpus; cpuID++) {
+		for (coreID=1; coreID<=cores_per_package; coreID++) {
+			if (coreID>1) {
+				pcontrol_blk = 0;
+				plen = 0;
+			}
+
+			/* Generate processor \_PR.CPUx */
+			len_pr = acpigen_write_processor(
+				(cpuID-1)*cores_per_package+coreID-1,
+				pcontrol_blk, plen);
+
+			/* Generate P-state tables */
+			len_pr += generate_P_state_entries(
+				cpuID-1, cores_per_package);
+
+			/* Generate C-state tables */
+			len_pr += generate_C_state_entries();
+
+			/* Generate T-state tables */
+			len_pr += generate_T_state_entries(
+				cpuID-1, cores_per_package);
+
+			len_pr--;
+			acpigen_patch_len(len_pr);
+		}
+	}
+}
+
+struct chip_operations cpu_intel_model_206ax_ops = {
+	CHIP_NAME("Intel SandyBridge/IvyBridge CPU")
+};