1 files changed, 278 insertions, 0 deletions
diff --git a/src/soc/intel/fsp_baytrail/cpu.c b/src/soc/intel/fsp_baytrail/cpu.c
new file mode 100644
index 0000000000..f260880d39
--- /dev/null
+++ b/src/soc/intel/fsp_baytrail/cpu.c
@@ -0,0 +1,278 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google Inc.
+ * Copyright (C) 2014 Sage Electronic Engineering, LLC.
+ *
+ * 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 <stdlib.h>
+#include <console/console.h>
+#include <cpu/cpu.h>
+#include <cpu/intel/microcode.h>
+#include <cpu/intel/turbo.h>
+#include <cpu/x86/cache.h>
+#include <cpu/x86/lapic.h>
+#include <cpu/x86/mp.h>
+#include <cpu/x86/msr.h>
+#include <cpu/x86/mtrr.h>
+#include <cpu/x86/smm.h>
+#include <reg_script.h>
+
+#include <baytrail/msr.h>
+#include <baytrail/pattrs.h>
+#include <baytrail/ramstage.h>
+#if IS_ENABLED(CONFIG_HAVE_SMI_HANDLER)
+#include <baytrail/smm.h>
+
+static void smm_relocate(void *unused);
+static void enable_smis(void *unused);
+
+static struct mp_flight_record mp_steps[] = {
+	MP_FR_BLOCK_APS(smm_relocate, NULL, smm_relocate, NULL),
+	MP_FR_BLOCK_APS(mp_initialize_cpu, NULL, mp_initialize_cpu, NULL),
+	/* Wait for APs to finish initialization before proceeding. */
+	MP_FR_BLOCK_APS(NULL, NULL, enable_smis, NULL),
+};
+#else /* CONFIG_HAVE_SMI_HANDLER */
+static struct mp_flight_record mp_steps[] = {
+	MP_FR_BLOCK_APS(mp_initialize_cpu, NULL, mp_initialize_cpu, NULL),
+};
+#endif
+
+/* The APIC id space on Bay Trail is sparse. Each id is separated by 2. */
+static int adjust_apic_id(int index, int apic_id)
+{
+	return 2 * index;
+}
+
+/* Core level MSRs */
+const struct reg_script core_msr_script[] = {
+	/* Dynamic L2 shrink enable and threshold */
+	REG_MSR_RMW(MSR_PMG_CST_CONFIG_CONTROL, ~0x3f000f, 0xe0008),
+	/* Disable C1E */
+	REG_MSR_RMW(MSR_POWER_CTL, ~0x2, 0),
+	REG_MSR_OR(MSR_POWER_MISC, 0x44),
+	REG_SCRIPT_END
+};
+
+void baytrail_init_cpus(device_t dev)
+{
+	struct bus *cpu_bus = dev->link_list;
+	const struct pattrs *pattrs = pattrs_get();
+	struct mp_params mp_params;
+
+	x86_mtrr_check();
+
+	/* Enable the local cpu apics */
+	setup_lapic();
+
+	mp_params.num_cpus = pattrs->num_cpus,
+	mp_params.parallel_microcode_load = 0,
+	mp_params.adjust_apic_id = adjust_apic_id;
+	mp_params.flight_plan = &mp_steps[0];
+	mp_params.num_records = ARRAY_SIZE(mp_steps);
+	mp_params.microcode_pointer = 0;
+
+	if (mp_init(cpu_bus, &mp_params)) {
+		printk(BIOS_ERR, "MP initialization failure.\n");
+	}
+}
+
+static void baytrail_core_init(device_t cpu)
+{
+	printk(BIOS_DEBUG, "Init BayTrail core.\n");
+
+	/* On bay trail the turbo disable bit is actually scoped at building
+	 * block level -- not package. For non-bsp cores that are within a
+	 * building block enable turbo. The cores within the BSP's building
+	 * block will just see it already enabled and move on. */
+	if (lapicid())
+		enable_turbo();
+
+	/* Set core MSRs */
+	reg_script_run(core_msr_script);
+
+	/* Set this core to max frequency ratio */
+	set_max_freq();
+}
+
+static struct device_operations cpu_dev_ops = {
+	.init = baytrail_core_init,
+};
+
+static struct cpu_device_id cpu_table[] = {
+	{ X86_VENDOR_INTEL, 0x30671 },
+	{ X86_VENDOR_INTEL, 0x30672 },
+	{ X86_VENDOR_INTEL, 0x30673 },
+	{ X86_VENDOR_INTEL, 0x30678 },
+	{ 0, 0 },
+};
+
+static const struct cpu_driver driver __cpu_driver = {
+	.ops      = &cpu_dev_ops,
+	.id_table = cpu_table,
+};
+
+#if IS_ENABLED(CONFIG_HAVE_SMI_HANDLER)
+/*
+ * SMM loading and initialization.
+ */
+
+struct smm_relocation_attrs {
+	uint32_t smbase;
+	uint32_t smrr_base;
+	uint32_t smrr_mask;
+};
+
+static struct smm_relocation_attrs relo_attrs;
+
+static void adjust_apic_id_map(struct smm_loader_params *smm_params)
+{
+	int i;
+	struct smm_runtime *runtime = smm_params->runtime;
+
+	for (i = 0; i < CONFIG_MAX_CPUS; i++)
+		runtime->apic_id_to_cpu[i] = mp_get_apic_id(i);
+}
+
+static void asmlinkage
+cpu_smm_do_relocation(void *arg, int cpu, const struct smm_runtime *runtime)
+{
+#ifndef CONFIG_MAX_CPUS
+#error CONFIG_MAX_CPUS must be set.
+#endif
+	msr_t smrr;
+	em64t100_smm_state_save_area_t *smm_state;
+
+	if (cpu >= CONFIG_MAX_CPUS) {
+		printk(BIOS_CRIT,
+		       "Invalid CPU number assigned in SMM stub: %d\n", cpu);
+		return;
+	}
+
+	/* Set up SMRR. */
+	smrr.lo = relo_attrs.smrr_base;
+	smrr.hi = 0;
+	wrmsr(SMRRphysBase_MSR, smrr);
+	smrr.lo = relo_attrs.smrr_mask;
+	smrr.hi = 0;
+	wrmsr(SMRRphysMask_MSR, smrr);
+
+	/* The relocated handler runs with all CPUs concurrently. Therefore
+	 * stagger the entry points adjusting SMBASE downwards by save state
+	 * size * CPU num. */
+	smm_state = (void *)(SMM_EM64T100_SAVE_STATE_OFFSET + runtime->smbase);
+	smm_state->smbase = relo_attrs.smbase - cpu * runtime->save_state_size;
+	printk(BIOS_DEBUG, "New SMBASE 0x%08x\n", smm_state->smbase);
+}
+
+static int install_relocation_handler(int num_cpus)
+{
+	const int save_state_size = sizeof(em64t100_smm_state_save_area_t);
+
+	struct smm_loader_params smm_params = {
+		.per_cpu_stack_size = save_state_size,
+		.num_concurrent_stacks = num_cpus,
+		.per_cpu_save_state_size = save_state_size,
+		.num_concurrent_save_states = 1,
+		.handler = (smm_handler_t)&cpu_smm_do_relocation,
+	};
+
+	if (smm_setup_relocation_handler(&smm_params))
+		return -1;
+
+	adjust_apic_id_map(&smm_params);
+
+	return 0;
+}
+
+static int install_permanent_handler(int num_cpus)
+{
+#ifndef CONFIG_SMM_RESERVED_SIZE
+#error CONFIG_SMM_RESERVED_SIZE must be set.
+#endif
+	/* There are num_cpus concurrent stacks and num_cpus concurrent save
+	 * state areas. Lastly, set the stack size to the save state size. */
+	int save_state_size = sizeof(em64t100_smm_state_save_area_t);
+	struct smm_loader_params smm_params = {
+		.per_cpu_stack_size = save_state_size,
+		.num_concurrent_stacks = num_cpus,
+		.per_cpu_save_state_size = save_state_size,
+		.num_concurrent_save_states = num_cpus,
+	};
+	const int tseg_size = smm_region_size() - CONFIG_SMM_RESERVED_SIZE;
+
+	printk(BIOS_DEBUG, "Installing SMM handler to 0x%08x\n",
+	       relo_attrs.smbase);
+
+	if (smm_load_module((void *)relo_attrs.smbase, tseg_size, &smm_params))
+		return -1;
+
+	adjust_apic_id_map(&smm_params);
+
+	return 0;
+}
+
+static int smm_load_handlers(void)
+{
+	/* All range registers are aligned to 4KiB */
+	const uint32_t rmask = ~((1 << 12) - 1);
+	const struct pattrs *pattrs = pattrs_get();
+
+	/* Initialize global tracking state. */
+	relo_attrs.smbase = (uint32_t)smm_region_start();
+	relo_attrs.smrr_base = relo_attrs.smbase | MTRR_TYPE_WRBACK;
+	relo_attrs.smrr_mask = ~(smm_region_size() - 1) & rmask;
+	relo_attrs.smrr_mask |= MTRRphysMaskValid;
+
+	/* Install handlers. */
+	if (install_relocation_handler(pattrs->num_cpus) < 0) {
+		printk(BIOS_ERR, "Unable to install SMM relocation handler.\n");
+		return -1;
+	}
+
+	if (install_permanent_handler(pattrs->num_cpus) < 0) {
+		printk(BIOS_ERR, "Unable to install SMM permanent handler.\n");
+		return -1;
+	}
+
+	/* Ensure the SMM handlers hit DRAM before performing first SMI. */
+	wbinvd();
+
+	return 0;
+}
+
+static void smm_relocate(void *unused)
+{
+
+	/* Load relocation and permanent handler. */
+	if (boot_cpu()) {
+		if (smm_load_handlers() < 0) {
+			printk(BIOS_ERR, "Error loading SMM handlers.\n");
+			return;
+		}
+		southcluster_smm_clear_state();
+	}
+
+	/* Relocate SMM space. */
+	smm_initiate_relocation();
+}
+
+static void enable_smis(void *unused)
+{
+	southcluster_smm_enable_smi();
+}
+#endif