CBMEM intel: Define get_top_of_ram() once per chipset

Only have one definition of get_top_of_ram() function and compile
it using __SIMPLE_DEVICE__ for both romstage and ramstage.

Implemented like this on intel/northbridge/gm45 already.
This also adds get_top_of_ram() to i945 ramstage.

Change-Id: Ia82cf6e47a4c929223ea3d8f233d606e6f5bf2f1
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3993
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

4 files changed, 33 insertions, 14 deletions

diff --git a/src/northbridge/intel/sandybridge/Makefile.inc b/src/northbridge/intel/sandybridge/Makefile.inc
index aa1739a974..37d392f32d 100644
--- a/src/northbridge/intel/sandybridge/Makefile.inc
+++ b/src/northbridge/intel/sandybridge/Makefile.inc
@@ -17,12 +17,14 @@
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 #
 
+ramstage-y += ram_calc.c
 ramstage-y += northbridge.c
 ramstage-y += gma.c
 
 ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += acpi.c
 ramstage-y += mrccache.c
 
+romstage-y += ram_calc.c
 romstage-y += raminit.c
 romstage-y += mrccache.c
 romstage-y += early_init.c
diff --git a/src/northbridge/intel/sandybridge/northbridge.c b/src/northbridge/intel/sandybridge/northbridge.c
index a03b8a6492..7db9301c30 100644
--- a/src/northbridge/intel/sandybridge/northbridge.c
+++ b/src/northbridge/intel/sandybridge/northbridge.c
@@ -51,13 +51,6 @@ int bridge_silicon_revision(void)
 	return bridge_revision_id;
 }
 
-unsigned long get_top_of_ram(void)
-{
-	/* Base of TSEG is top of usable DRAM */
-	u32 tom = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0,0)), TSEG);
-	return (unsigned long) tom;
-}
-
 /* Reserve everything between A segment and 1MB:
  *
  * 0xa0000 - 0xbffff: legacy VGA
diff --git a/src/northbridge/intel/sandybridge/ram_calc.c b/src/northbridge/intel/sandybridge/ram_calc.c
new file mode 100644
index 0000000000..3693a07355
--- /dev/null
+++ b/src/northbridge/intel/sandybridge/ram_calc.c
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 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
+ */
+
+#define __SIMPLE_DEVICE__
+
+#include <arch/io.h>
+#include <cbmem.h>
+#include "sandybridge.h"
+
+unsigned long get_top_of_ram(void)
+{
+	/* Base of TSEG is top of usable DRAM */
+	u32 tom = pci_read_config32(PCI_DEV(0,0,0), TSEG);
+	return (unsigned long) tom;
+}
diff --git a/src/northbridge/intel/sandybridge/raminit.c b/src/northbridge/intel/sandybridge/raminit.c
index 07172fc768..3b6557199f 100644
--- a/src/northbridge/intel/sandybridge/raminit.c
+++ b/src/northbridge/intel/sandybridge/raminit.c
@@ -302,10 +302,3 @@ void sdram_initialize(struct pei_data *pei_data)
 	if (pei_data->boot_mode != 2)
 		save_mrc_data(pei_data);
 }
-
-unsigned long get_top_of_ram(void)
-{
-	/* Base of TSEG is top of usable DRAM */
-	u32 tom = pci_read_config32(PCI_DEV(0,0,0), TSEG);
-	return (unsigned long) tom;
-}