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>

1 files changed, 160 insertions, 0 deletions

diff --git a/arch/mn10300/lib/memmove.S b/arch/mn10300/lib/memmove.S
new file mode 100644
index 000000000000..20b07b62b77c
--- /dev/null
+++ b/arch/mn10300/lib/memmove.S
@@ -0,0 +1,160 @@
+/* MN10300 Optimised simple memory to memory copy, with support for overlapping
+ * regions
+ *
+ * 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 <asm/cache.h>
+
+        .section .text
+        .balign	L1_CACHE_BYTES
+
+###############################################################################
+#
+# void *memmove(void *dst, const void *src, size_t n)
+#
+###############################################################################
+	.globl	memmove
+        .type	memmove,@function
+memmove:
+	# fall back to memcpy if dst < src to work bottom up
+	cmp	d1,d0
+	bcs	memmove_memcpy
+
+	# work top down
+	movm	[d2,d3],(sp)
+	mov	d0,(12,sp)
+	mov	d1,(16,sp)
+	mov	(20,sp),d2			# count
+	add	d0,d2,a0			# dst end
+	add	d1,d2,a1			# src end
+	mov	d0,e3				# the return value
+
+	cmp	+0,d2
+	beq	memmove_done			# return if zero-length copy
+
+	# see if the three parameters are all four-byte aligned
+	or	d0,d1,d3
+	or	d2,d3
+	and	+3,d3
+	bne	memmove_1			# jump if not
+
+	# we want to transfer as much as we can in chunks of 32 bytes
+	add	-4,a1
+	cmp	+31,d2
+	bls	memmove_4_remainder		# 4-byte aligned remainder
+
+	add	-32,d2
+	mov	+32,d3
+
+memmove_4_loop:
+	mov	(a1),d0
+	sub_sub	+4,a1,+4,a0
+	mov	d0,(a0)
+	mov	(a1),d1
+	sub_sub	+4,a1,+4,a0
+	mov	d1,(a0)
+
+	mov	(a1),d0
+	sub_sub	+4,a1,+4,a0
+	mov	d0,(a0)
+	mov	(a1),d1
+	sub_sub	+4,a1,+4,a0
+	mov	d1,(a0)
+
+	mov	(a1),d0
+	sub_sub	+4,a1,+4,a0
+	mov	d0,(a0)
+	mov	(a1),d1
+	sub_sub	+4,a1,+4,a0
+	mov	d1,(a0)
+
+	mov	(a1),d0
+	sub_sub	+4,a1,+4,a0
+	mov	d0,(a0)
+	mov	(a1),d1
+	sub_sub	+4,a1,+4,a0
+	mov	d1,(a0)
+
+	sub	d3,d2
+	bcc	memmove_4_loop
+
+	add	d3,d2
+	beq	memmove_4_no_remainder
+
+memmove_4_remainder:
+	# cut 4-7 words down to 0-3
+	cmp	+16,d2
+	bcs	memmove_4_three_or_fewer_words
+	mov	(a1),d0
+	sub_sub	+4,a1,+4,a0
+	mov	d0,(a0)
+	mov	(a1),d1
+	sub_sub	+4,a1,+4,a0
+	mov	d1,(a0)
+	mov	(a1),e0
+	sub_sub	+4,a1,+4,a0
+	mov	e0,(a0)
+	mov	(a1),e1
+	sub_sub	+4,a1,+4,a0
+	mov	e1,(a0)
+	add	-16,d2
+	beq	memmove_4_no_remainder
+
+	# copy the remaining 1, 2 or 3 words
+memmove_4_three_or_fewer_words:
+	cmp	+8,d2
+	bcs	memmove_4_one_word
+	beq	memmove_4_two_words
+	mov	(a1),d0
+	sub_sub	+4,a1,+4,a0
+	mov	d0,(a0)
+memmove_4_two_words:
+	mov	(a1),d0
+	sub_sub	+4,a1,+4,a0
+	mov	d0,(a0)
+memmove_4_one_word:
+	mov	(a1),d0
+	sub_sub	+4,a1,+4,a0
+	mov	d0,(a0)
+
+memmove_4_no_remainder:
+	# check we copied the correct amount
+	# TODO: REMOVE CHECK
+	sub	e3,a0,d2
+	beq	memmove_done
+	break
+	break
+	break
+
+memmove_done:
+	mov	e3,a0
+	ret	[d2,d3],8
+
+	# handle misaligned copying
+memmove_1:
+	add	-1,a1
+	add	-1,d2
+	mov	+1,d3
+	setlb					# setlb requires the next insns
+						# to occupy exactly 4 bytes
+
+	sub	d3,d2
+	movbu	(a1),d0
+	sub_sub	d3,a1,d3,a0
+	movbu	d0,(a0)
+	lcc
+
+	mov	e3,a0
+	ret	[d2,d3],8
+
+memmove_memcpy:
+	jmp	memcpy
+
+memmove_end:
+	.size	memmove, memmove_end-memmove