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>

3 files changed, 59 insertions, 33 deletions

diff --git a/src/northbridge/intel/i945/Makefile.inc b/src/northbridge/intel/i945/Makefile.inc
index 92a8849d72..67643eb972 100644
--- a/src/northbridge/intel/i945/Makefile.inc
+++ b/src/northbridge/intel/i945/Makefile.inc
@@ -17,10 +17,12 @@
 # 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
 
+romstage-y += ram_calc.c
 romstage-y += raminit.c
 romstage-y += early_init.c
 romstage-y += errata.c
diff --git a/src/northbridge/intel/i945/ram_calc.c b/src/northbridge/intel/i945/ram_calc.c
new file mode 100644
index 0000000000..4ece5402fb
--- /dev/null
+++ b/src/northbridge/intel/i945/ram_calc.c
@@ -0,0 +1,57 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ *
+ * 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
+ */
+
+// Use simple device model for this file even in ramstage
+#define __SIMPLE_DEVICE__
+
+#include <arch/io.h>
+#include <cbmem.h>
+#include "i945.h"
+
+unsigned long get_top_of_ram(void)
+{
+	u32 tom;
+
+	if (pci_read_config8(PCI_DEV(0, 0x0, 0), DEVEN) & ((1 << 4) | (1 << 3))) {
+		/* IGD enabled, get top of Memory from BSM register */
+		tom = pci_read_config32(PCI_DEV(0,2,0), 0x5c);
+	} else {
+		tom = (pci_read_config8(PCI_DEV(0,0,0), TOLUD) & 0xf7) << 24;
+	}
+
+	/* if TSEG enabled subtract size */
+	switch(pci_read_config8(PCI_DEV(0, 0, 0), ESMRAM)) {
+	case 0x01:
+		/* 1MB TSEG */
+		tom -= 0x10000;
+		break;
+	case 0x03:
+		/* 2MB TSEG */
+		tom -= 0x20000;
+		break;
+	case 0x05:
+		/* 8MB TSEG */
+		tom -= 0x80000;
+		break;
+	default:
+		/* TSEG either disabled or invalid */
+		break;
+	}
+	return (unsigned long) tom;
+}
diff --git a/src/northbridge/intel/i945/raminit.c b/src/northbridge/intel/i945/raminit.c
index 046f5f8e3d..6943fd9d8e 100644
--- a/src/northbridge/intel/i945/raminit.c
+++ b/src/northbridge/intel/i945/raminit.c
@@ -3183,36 +3183,3 @@ void sdram_initialize(int boot_path, const u8 *spd_addresses)
 
 	sdram_setup_processor_side();
 }
-
-unsigned long get_top_of_ram(void)
-{
-	u32 tom;
-
-	if (pci_read_config8(PCI_DEV(0, 0x0, 0), DEVEN) & ((1 << 4) | (1 << 3))) {
-		/* IGD enabled, get top of Memory from BSM register */
-		tom = pci_read_config32(PCI_DEV(0,2,0), 0x5c);
-	} else {
-		tom = (pci_read_config8(PCI_DEV(0,0,0), TOLUD) & 0xf7) << 24;
-	}
-
-	/* if TSEG enabled subtract size */
-	switch(pci_read_config8(PCI_DEV(0, 0, 0), ESMRAM)) {
-	case 0x01:
-		/* 1MB TSEG */
-		tom -= 0x10000;
-		break;
-	case 0x03:
-		/* 2MB TSEG */
-		tom -= 0x20000;
-		break;
-	case 0x05:
-		/* 8MB TSEG */
-		tom -= 0x80000;
-		break;
-	default:
-		/* TSEG either disabled or invalid */
-		break;
-	}
-	return (unsigned long) tom;
-}
-