Add support for Google's Chromebook Pixel

Ladies and gentlemen, I'm very happy to announce coreboot support for
the latest and greatest Google Chromebook: The Chromebook Pixel.

See the link below for more information on the Chromebook Pixel, and
its exciting specs:
http://www.google.com/intl/en/chrome/devices/chromebooks.html#pixel

The device is running coreboot and open source firmware on the EC
(see ChromeEC commit for more information on that exciting topic)

Change-Id: I03d00cf391bbb1a32f330793fe9058493e088571
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/2482
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/mainboard/google/link/ec.c

@@ -0,0 +1,52 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 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 <arch/acpi.h>
+#include <vendorcode/google/chromeos/chromeos.h>
+#include <types.h>
+#include <console/console.h>
+#include <ec/google/chromeec/ec.h>
+#include "ec.h"
+
+void link_ec_init(void)
+{
+	printk(BIOS_DEBUG, "link_ec_init\n");
+	post_code(0xf0);
+
+	/* Restore SCI event mask on resume. */
+	if (acpi_slp_type == 3) {
+		google_chromeec_log_events(LINK_EC_LOG_EVENTS |
+					   LINK_EC_S3_WAKE_EVENTS);
+
+		/* Disable SMI and wake events */
+		google_chromeec_set_smi_mask(0);
+
+		/* Clear pending events */
+		while (google_chromeec_get_event() != 0);
+		google_chromeec_set_sci_mask(LINK_EC_SCI_EVENTS);
+	} else {
+		google_chromeec_log_events(LINK_EC_LOG_EVENTS |
+					   LINK_EC_S5_WAKE_EVENTS);
+	}
+
+	/* Clear wake events, these are enabled on entry to sleep */
+	google_chromeec_set_wake_mask(0);
+
+	post_code(0xf1);
+}