From 23fbee9dd5d2a41d36af49ff8e1669fb0c29fda8 Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 25 Jul 2005 22:45:45 +0000
Subject: Support for Toshiba's RBHMA4500 eval board for the TX4938.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
 arch/mips/tx4938/common/prom.c | 129 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 arch/mips/tx4938/common/prom.c

(limited to 'arch/mips/tx4938/common/prom.c')

diff --git a/arch/mips/tx4938/common/prom.c b/arch/mips/tx4938/common/prom.c
new file mode 100644
index 00000000000..3189a65f7d7
--- /dev/null
+++ b/arch/mips/tx4938/common/prom.c
@@ -0,0 +1,129 @@
+/*
+ * linux/arch/mips/tx4938/common/prom.c
+ *
+ * common tx4938 memory interface
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/bootmem.h>
+
+#include <asm/addrspace.h>
+#include <asm/bootinfo.h>
+#include <asm/tx4938/tx4938.h>
+
+static unsigned int __init
+tx4938_process_sdccr(u64 * addr)
+{
+	u64 val;
+	unsigned int sdccr_ce;
+	unsigned int sdccr_rs;
+	unsigned int sdccr_cs;
+	unsigned int sdccr_mw;
+	unsigned int rs = 0;
+	unsigned int cs = 0;
+	unsigned int mw = 0;
+	unsigned int bc = 4;
+	unsigned int msize = 0;
+
+	val = (*((vu64 *) (addr)));
+
+	/* MVMCP -- need #defs for these bits masks */
+	sdccr_ce = ((val & (1 << 10)) >> 10);
+	sdccr_rs = ((val & (3 << 5)) >> 5);
+	sdccr_cs = ((val & (7 << 2)) >> 2);
+	sdccr_mw = ((val & (1 << 0)) >> 0);
+
+	if (sdccr_ce) {
+		switch (sdccr_rs) {
+		case 0:{
+				rs = 2048;
+				break;
+			}
+		case 1:{
+				rs = 4096;
+				break;
+			}
+		case 2:{
+				rs = 8192;
+				break;
+			}
+		default:{
+				rs = 0;
+				break;
+			}
+		}
+		switch (sdccr_cs) {
+		case 0:{
+				cs = 256;
+				break;
+			}
+		case 1:{
+				cs = 512;
+				break;
+			}
+		case 2:{
+				cs = 1024;
+				break;
+			}
+		case 3:{
+				cs = 2048;
+				break;
+			}
+		case 4:{
+				cs = 4096;
+				break;
+			}
+		default:{
+				cs = 0;
+				break;
+			}
+		}
+		switch (sdccr_mw) {
+		case 0:{
+				mw = 8;
+				break;
+			}	/* 8 bytes = 64 bits */
+		case 1:{
+				mw = 4;
+				break;
+			}	/* 4 bytes = 32 bits */
+		}
+	}
+
+	/*           bytes per chip    MB per chip          bank count */
+	msize = (((rs * cs * mw) / (1024 * 1024)) * (bc));
+
+	/* MVMCP -- bc hard coded to 4 from table 9.3.1     */
+	/*          boad supports bc=2 but no way to detect */
+
+	return (msize);
+}
+
+unsigned int __init
+tx4938_get_mem_size(void)
+{
+	unsigned int c0;
+	unsigned int c1;
+	unsigned int c2;
+	unsigned int c3;
+	unsigned int total;
+
+	/* MVMCP -- need #defs for these registers */
+	c0 = tx4938_process_sdccr((u64 *) 0xff1f8000);
+	c1 = tx4938_process_sdccr((u64 *) 0xff1f8008);
+	c2 = tx4938_process_sdccr((u64 *) 0xff1f8010);
+	c3 = tx4938_process_sdccr((u64 *) 0xff1f8018);
+	total = c0 + c1 + c2 + c3;
+
+	return (total);
+}
-- 
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