mainboard/intel: add leafhill board directory

This commit adds the initial scaffolding for the Intel Leafhill CRB
with Apollo Lake silicon.

The google/reef directory is used as a template. This commit only
makes the minimum changes to Kconfig and Kconfig.name needed for
the build bot to not have issues.

Change-Id: I088edee0e94ecfb4666fa31e08dbcfd24a81891b
Signed-off-by: Brenton Dong <brenton.m.dong@intel.com>
Reviewed-on: https://review.coreboot.org/18038
Tested-by: build bot (Jenkins)
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>

src/mainboard/intel/leafhill/smihandler.c

@@ -0,0 +1,52 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ * Copyright (C) 2016 Intel Corp.
+ *
+ * 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.
+ */
+
+#include <arch/acpi.h>
+#include <baseboard/variants.h>
+#include <cpu/x86/smm.h>
+#include <ec/google/chromeec/smm.h>
+#include <soc/pm.h>
+#include <soc/smm.h>
+#include <soc/gpio.h>
+#include <variant/ec.h>
+#include <variant/gpio.h>
+
+void mainboard_smi_gpi_handler(const struct gpi_status *sts)
+{
+	if (gpi_status_get(sts, EC_SMI_GPI))
+		chromeec_smi_process_events();
+}
+
+void mainboard_smi_sleep(u8 slp_typ)
+{
+	const struct pad_config *pads;
+	size_t num;
+
+	pads = variant_sleep_gpio_table(&num);
+	gpio_configure_pads(pads, num);
+
+	if (IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC))
+		chromeec_smi_sleep(slp_typ, MAINBOARD_EC_S3_WAKE_EVENTS,
+					MAINBOARD_EC_S5_WAKE_EVENTS);
+}
+
+int mainboard_smi_apmc(u8 apmc)
+{
+	if (IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC))
+		chromeec_smi_apmc(apmc, MAINBOARD_EC_SCI_EVENTS,
+					MAINBOARD_EC_SMI_EVENTS);
+	return 0;
+}