mn10300: add the MN10300/AM33 architecture to the kernel
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the
kernel.
This patch also adds board support for the ASB2303 with the ASB2308 daughter
board, and the ASB2305. The only processor supported is the MN103E010, which
is an AM33v2 core plus on-chip devices.
[akpm@linux-foundation.org: nuke cvs control strings]
Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com>
Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/mn10300/lib/delay.c b/arch/mn10300/lib/delay.c
new file mode 100644
index 0000000..cce66bc
--- /dev/null
+++ b/arch/mn10300/lib/delay.c
@@ -0,0 +1,50 @@
+/* MN10300 Short delay interpolation routines
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <asm/div64.h>
+
+/*
+ * basic delay loop
+ */
+void __delay(unsigned long loops)
+{
+ int d0;
+
+ asm volatile(
+ " bra 1f \n"
+ " .align 4 \n"
+ "1: bra 2f \n"
+ " .align 4 \n"
+ "2: add -1,%0 \n"
+ " bne 2b \n"
+ : "=&d" (d0)
+ : "0" (loops));
+}
+EXPORT_SYMBOL(__delay);
+
+/*
+ * handle a delay specified in terms of microseconds
+ */
+void __udelay(unsigned long usecs)
+{
+ signed long ioclk, stop;
+
+ /* usecs * CLK / 1E6 */
+ stop = __muldiv64u(usecs, MN10300_TSCCLK, 1000000);
+ stop = TMTSCBC - stop;
+
+ do {
+ ioclk = TMTSCBC;
+ } while (stop < ioclk);
+}
+EXPORT_SYMBOL(__udelay);