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, 121 insertions, 0 deletions

diff --git a/arch/mn10300/lib/memset.S b/arch/mn10300/lib/memset.S
new file mode 100644
index 000000000000..bc02e39629b7
--- /dev/null
+++ b/arch/mn10300/lib/memset.S
@@ -0,0 +1,121 @@
+/* Optimised simple memory fill
+ *
+ * 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 *memset(void *dst, int c, size_t n)
+#
+###############################################################################
+        .globl  memset
+        .type   memset,@function
+memset:
+        movm    [d2,d3],(sp)
+        mov     d0,(12,sp)
+        mov     d1,(16,sp)
+        mov     (20,sp),d2                      # count
+        mov     d0,a0                           # dst
+        mov     d0,e3                           # the return value
+
+        cmp     +0,d2
+        beq     memset_done                     # return if zero-length fill
+
+        # see if the region parameters are four-byte aligned
+        or      d0,d2,d3
+        and     +3,d3
+        bne     memset_1                        # jump if not
+
+        extbu   d1
+        mov_asl d1,d3,8,d1
+        or_asl  d1,d3,8,d1
+        or_asl  d1,d3,8,d1
+        or      d3,d1
+
+        # we want to transfer as much as we can in chunks of 32 bytes
+        cmp     +31,d2
+        bls     memset_4_remainder              # 4-byte aligned remainder
+
+        add     -32,d2
+        mov     +32,d3
+
+memset_4_loop:
+        mov     d1,(a0+)
+        mov     d1,(a0+)
+        mov     d1,(a0+)
+        mov     d1,(a0+)
+        mov     d1,(a0+)
+        mov     d1,(a0+)
+        mov     d1,(a0+)
+        mov     d1,(a0+)
+
+        sub     d3,d2
+        bcc     memset_4_loop
+
+        add     d3,d2
+        beq     memset_4_no_remainder
+
+memset_4_remainder:
+        # cut 4-7 words down to 0-3
+        cmp     +16,d2
+        bcs     memset_4_three_or_fewer_words
+        mov     d1,(a0+)
+        mov     d1,(a0+)
+        mov     d1,(a0+)
+        mov     d1,(a0+)
+        add     -16,d2
+        beq     memset_4_no_remainder
+
+        # copy the remaining 1, 2 or 3 words
+memset_4_three_or_fewer_words:
+        cmp     +8,d2
+        bcs     memset_4_one_word
+        beq     memset_4_two_words
+        mov     d1,(a0+)
+memset_4_two_words:
+        mov     d1,(a0+)
+memset_4_one_word:
+        mov     d1,(a0+)
+
+memset_4_no_remainder:
+        # check we set the correct amount
+        # TODO: REMOVE CHECK
+        sub     e3,a0,d2
+        mov     (20,sp),d1
+        cmp     d2,d1
+        beq     memset_done
+        break
+        break
+        break
+
+memset_done:
+        mov     e3,a0
+        ret     [d2,d3],8
+
+        # handle misaligned copying
+memset_1:
+        add     -1,d2
+        mov     +1,d3
+        setlb                                   # setlb requires the next insns
+                                                # to occupy exactly 4 bytes
+
+        sub     d3,d2
+        movbu   d1,(a0)
+        inc     a0
+        lcc
+
+        mov     e3,a0
+        ret     [d2,d3],8
+
+memset_end:
+        .size   memset, memset_end-memset