northbridge/intel: Add fsp_rangeley northbridge support

This adds the northbridge initialization pieces for Intel's Atom C2000
processor (Formerly Rangeley).  It is intended to be used with the Intel
Atom C2000 FSP and does not contain all of the pieces that would
otherwise be required for initialization.

Not currently supported:
S3 suspend/resume
CAR memory Migration (No early cbmem console)
SMM

Change-Id: I7665212c892d9a08ecf35d7be70d0afe5fd2c77b
Signed-off-by: Martin Roth <gaumless@gmail.com>
Reviewed-on: http://review.coreboot.org/6369
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/src/northbridge/intel/fsp_rangeley/raminit.c b/src/northbridge/intel/fsp_rangeley/raminit.c
new file mode 100644
index 0000000000..3513c0f33d
--- /dev/null
+++ b/src/northbridge/intel/fsp_rangeley/raminit.c
@@ -0,0 +1,44 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 Google Inc.
+ * Copyright (C) 2013-2014 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 <console/console.h>
+#include <string.h>
+#include <arch/io.h>
+#include <cbmem.h>
+#include <device/pci_def.h>
+#include "northbridge.h"
+#include <drivers/intel/fsp/fsp_util.h>
+
+unsigned long get_top_of_ram(void)
+{
+	/*
+	 * Calculate the top of usable (low) DRAM.
+	 * The FSP's reserved memory sits just below the SMM region,
+	 * allowing calculation of the top of usable memory.
+	 */
+	u32 tom = sideband_read(B_UNIT, BMBOUND);
+	u32 bsmmrrl = sideband_read(B_UNIT, BSMMRRL) << 20;
+	if (bsmmrrl) {
+		tom = bsmmrrl;
+	}
+	tom -= FSP_RESERVE_MEMORY_SIZE;
+
+	return (unsigned long) tom;
+}