From 4a5b6a356a79123d3fcd780139629213afcedca8 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Sat, 28 Apr 2001 17:59:11 +0000
Subject: Initial revision

---
 board/rsdproto/flash_asm.S | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 board/rsdproto/flash_asm.S

(limited to 'board/rsdproto/flash_asm.S')

diff --git a/board/rsdproto/flash_asm.S b/board/rsdproto/flash_asm.S
new file mode 100644
index 0000000000..c65fb87040
--- /dev/null
+++ b/board/rsdproto/flash_asm.S
@@ -0,0 +1,39 @@
+/*
+ * -*- mode:c -*-
+ *
+ * (C) Copyright 2000
+ * Marius Groeger <mgroeger@sysgo.de>
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ *
+ * void ull_write(unsigned long long volatile *address,
+ *                unsigned long long volatile *data)
+ * r3 = address
+ * r4 = data
+ *
+ * void ull_read(unsigned long long volatile *address,
+ *                unsigned long long volatile *data)
+ * r3 = address
+ * r4 = data
+ *
+ * Uses the floating point unit to read and write 64 bit wide
+ * data (unsigned long long) on the 60x bus. This is necessary
+ * because all 4 flash chips use the /WE line from byte lane 0
+ *
+ * IMPORTANT: data should always be 8-aligned, otherwise an exception will
+ * occur.
+ */
+
+#include <ppc_asm.tmpl>
+#include <ppc_defs.h>
+
+.globl	ull_write
+ull_write:
+	lfd		0,0(r4)
+	stfd	0,0(r3)
+	blr
+
+	.globl	ull_read
+ull_read:
+	lfd		0, 0(r3)
+	stfd	0, 0(r4)
+	blr
-- 
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