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 00000000000..20b07b62b77
--- /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