soc/intel/skylake: Use Broadwell as comparision base for Skylake SOC

Use the Broadwell implementation as the comparison base for Skylake.

BRANCH=none
BUG=None
TEST=None

Change-Id: I22eb55ea89eb0d6883f98e4c72a6d243e819e6d8
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: http://review.coreboot.org/10340
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

1 files changed, 123 insertions, 0 deletions

diff --git a/src/soc/intel/skylake/smi.c b/src/soc/intel/skylake/smi.c
new file mode 100644
index 0000000000..85a508b629
--- /dev/null
+++ b/src/soc/intel/skylake/smi.c
@@ -0,0 +1,123 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ * Copyright (C) 2014 Google Inc.
+ *
+ * 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 <device/device.h>
+#include <device/pci.h>
+#include <console/console.h>
+#include <arch/io.h>
+#include <cpu/cpu.h>
+#include <cpu/x86/cache.h>
+#include <cpu/x86/smm.h>
+#include <string.h>
+#include <soc/iomap.h>
+#include <soc/pch.h>
+#include <soc/pm.h>
+#include <soc/smm.h>
+
+void southbridge_smm_clear_state(void)
+{
+	u32 smi_en;
+
+	printk(BIOS_DEBUG, "Initializing Southbridge SMI...");
+	printk(BIOS_SPEW, " ... pmbase = 0x%04x\n", ACPI_BASE_ADDRESS);
+
+	smi_en = inl(ACPI_BASE_ADDRESS + SMI_EN);
+	if (smi_en & APMC_EN) {
+		printk(BIOS_INFO, "SMI# handler already enabled?\n");
+		return;
+	}
+
+	printk(BIOS_DEBUG, "\n");
+
+	/* Dump and clear status registers */
+	clear_smi_status();
+	clear_pm1_status();
+	clear_tco_status();
+	clear_gpe_status();
+}
+
+void southbridge_smm_enable_smi(void)
+{
+	printk(BIOS_DEBUG, "Enabling SMIs.\n");
+	/* Configure events */
+	enable_pm1(PWRBTN_EN | GBL_EN);
+	disable_gpe(PME_B0_EN);
+
+	/* Enable SMI generation:
+	 *  - on APMC writes (io 0xb2)
+	 *  - on writes to SLP_EN (sleep states)
+	 *  - on writes to GBL_RLS (bios commands)
+	 * No SMIs:
+	 *  - on microcontroller writes (io 0x62/0x66)
+	 *  - on TCO events
+	 */
+	enable_smi(APMC_EN | SLP_SMI_EN | GBL_SMI_EN | EOS);
+}
+
+void southbridge_trigger_smi(void)
+{
+	/**
+	 * There are several methods of raising a controlled SMI# via
+	 * software, among them:
+	 *  - Writes to io 0xb2 (APMC)
+	 *  - Writes to the Local Apic ICR with Delivery mode SMI.
+	 *
+	 * Using the local apic is a bit more tricky. According to
+	 * AMD Family 11 Processor BKDG no destination shorthand must be
+	 * used.
+	 * The whole SMM initialization is quite a bit hardware specific, so
+	 * I'm not too worried about the better of the methods at the moment
+	 */
+
+	/* raise an SMI interrupt */
+	printk(BIOS_SPEW, "  ... raise SMI#\n");
+	outb(0x00, 0xb2);
+}
+
+void southbridge_clear_smi_status(void)
+{
+	/* Clear SMI status */
+	clear_smi_status();
+
+	/* Clear PM1 status */
+	clear_pm1_status();
+
+	/* Set EOS bit so other SMIs can occur. */
+	enable_smi(EOS);
+}
+
+void smm_setup_structures(void *gnvs, void *tcg, void *smi1)
+{
+	/*
+	 * Issue SMI to set the gnvs pointer in SMM.
+	 * tcg and smi1 are unused.
+	 *
+	 * EAX = APM_CNT_GNVS_UPDATE
+	 * EBX = gnvs pointer
+	 * EDX = APM_CNT
+	 */
+	asm volatile (
+		"outb %%al, %%dx\n\t"
+		: /* ignore result */
+		: "a" (APM_CNT_GNVS_UPDATE),
+		  "b" ((u32)gnvs),
+		  "d" (APM_CNT)
+	);
+}