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, 162 insertions, 0 deletions

diff --git a/arch/mn10300/lib/do_csum.S b/arch/mn10300/lib/do_csum.S
new file mode 100644
index 000000000000..e138994e1667
--- /dev/null
+++ b/arch/mn10300/lib/do_csum.S
@@ -0,0 +1,162 @@
+/* Optimised simple memory checksum
+ *
+ * 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
+
+###############################################################################
+#
+# unsigned int do_csum(const unsigned char *buff, size_t len)
+#
+###############################################################################
+        .globl  do_csum
+        .type   do_csum,@function
+do_csum:
+        movm    [d2,d3],(sp)
+        mov     d0,(12,sp)
+        mov     d1,(16,sp)
+        mov     d1,d2                           # count
+        mov     d0,a0                           # buff
+        clr     d1                              # accumulator
+
+        cmp     +0,d2
+        beq     do_csum_done                    # return if zero-length buffer
+
+        # 4-byte align the buffer pointer
+        btst    +3,a0
+        beq     do_csum_now_4b_aligned
+
+        btst    +1,a0
+        beq     do_csum_addr_not_odd
+        movbu   (a0),d0
+        inc     a0
+        asl     +8,d0
+        add     d0,d1
+        addc    +0,d1
+        add     -1,d2
+do_csum_addr_not_odd:
+
+        cmp     +2,d2
+        bcs     do_csum_fewer_than_4
+        btst    +2,a0
+        beq     do_csum_now_4b_aligned
+        movhu   (a0+),d0
+        add     d0,d1
+        addc    +0,d1
+        add     -2,d2
+        cmp     +4,d2
+        bcs     do_csum_fewer_than_4
+
+do_csum_now_4b_aligned:
+        # we want to checksum as much as we can in chunks of 32 bytes
+        cmp     +31,d2
+        bls     do_csum_remainder               # 4-byte aligned remainder
+
+        add     -32,d2
+        mov     +32,d3
+
+do_csum_loop:
+        mov     (a0+),d0
+        add     d0,d1
+        mov     (a0+),e0
+        addc    e0,d1
+        mov     (a0+),e1
+        addc    e1,d1
+        mov     (a0+),e3
+        addc    e3,d1
+        mov     (a0+),d0
+        addc    d0,d1
+        mov     (a0+),e0
+        addc    e0,d1
+        mov     (a0+),e1
+        addc    e1,d1
+        mov     (a0+),e3
+        addc    e3,d1
+        addc    +0,d1
+
+        sub     d3,d2
+        bcc     do_csum_loop
+
+        add     d3,d2
+        beq     do_csum_done
+
+do_csum_remainder:
+        # cut 16-31 bytes down to 0-15
+        cmp     +16,d2
+        bcs     do_csum_fewer_than_16
+        mov     (a0+),d0
+        add     d0,d1
+        mov     (a0+),e0
+        addc    e0,d1
+        mov     (a0+),e1
+        addc    e1,d1
+        mov     (a0+),e3
+        addc    e3,d1
+        addc    +0,d1
+        add     -16,d2
+        beq     do_csum_done
+
+do_csum_fewer_than_16:
+        # copy the remaining whole words
+        cmp     +4,d2
+        bcs     do_csum_fewer_than_4
+        cmp     +8,d2
+        bcs     do_csum_one_word
+        cmp     +12,d2
+        bcs     do_csum_two_words
+        mov     (a0+),d0
+        add     d0,d1
+        addc    +0,d1
+do_csum_two_words:
+        mov     (a0+),d0
+        add     d0,d1
+        addc    +0,d1
+do_csum_one_word:
+        mov     (a0+),d0
+        add     d0,d1
+        addc    +0,d1
+
+do_csum_fewer_than_4:
+        and     +3,d2
+        beq     do_csum_done
+        xor_cmp d0,d0,+2,d2
+        bcs     do_csum_fewer_than_2
+        movhu   (a0+),d0
+do_csum_fewer_than_2:
+        and     +1,d2
+        beq     do_csum_add_last_bit
+        movbu   (a0),d3
+        add     d3,d0
+do_csum_add_last_bit:
+        add     d0,d1
+        addc    +0,d1
+
+do_csum_done:
+        # compress the checksum down to 16 bits
+        mov     +0xffff0000,d2
+        and     d1,d2
+        asl     +16,d1
+        add     d2,d1,d0
+        addc    +0xffff,d0
+        lsr     +16,d0
+
+        # flip the halves of the word result if the buffer was oddly aligned
+        mov     (12,sp),d1
+        and     +1,d1
+        beq     do_csum_not_oddly_aligned
+        swaph   d0,d0                           # exchange bits 15:8 with 7:0
+
+do_csum_not_oddly_aligned:
+        ret     [d2,d3],8
+
+do_csum_end:
+        .size   do_csum, do_csum_end-do_csum