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, 93 insertions, 0 deletions

diff --git a/arch/mn10300/kernel/gdb-io-ttysm-low.S b/arch/mn10300/kernel/gdb-io-ttysm-low.S
new file mode 100644
index 000000000000..677c7876307c
--- /dev/null
+++ b/arch/mn10300/kernel/gdb-io-ttysm-low.S
@@ -0,0 +1,93 @@
+###############################################################################
+#
+# MN10300 On-chip serial Rx interrupt handler for GDB stub I/O
+#
+# 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/sys.h>
+#include <linux/linkage.h>
+#include <asm/smp.h>
+#include <asm/thread_info.h>
+#include <asm/cpu-regs.h>
+#include <asm/frame.inc>
+#include <asm/intctl-regs.h>
+#include <asm/unit/serial.h>
+#include "mn10300-serial.h"
+
+        .text
+
+###############################################################################
+#
+# GDB stub serial receive interrupt entry point
+# - intended to run at interrupt priority 0
+#
+###############################################################################
+        .globl  gdbstub_io_rx_handler
+        .type   gdbstub_io_rx_handler,@function
+gdbstub_io_rx_handler:
+        movm    [d2,d3,a2,a3],(sp)
+
+        mov     (gdbstub_rx_inp),a3
+gdbstub_io_rx_more:
+        mov     a3,a2
+        add     2,a3
+        and     PAGE_SIZE_asm-1,a3
+        mov     (gdbstub_rx_outp),d3
+        cmp     a3,d3
+        beq     gdbstub_io_rx_overflow
+
+        movbu   (SCgSTR),d3
+        btst    SC01STR_RBF,d3
+        beq     gdbstub_io_rx_done
+        movbu   (SCgRXB),d2
+        movbu   d3,(gdbstub_rx_buffer+1,a2)
+        movbu   d2,(gdbstub_rx_buffer,a2)
+        mov     a3,(gdbstub_rx_inp)
+        bra     gdbstub_io_rx_more
+
+gdbstub_io_rx_done:
+        mov     GxICR_DETECT,d2
+        movbu   d2,(GxICR(SCgRXIRQ))    # ACK the interrupt
+        movhu   (GxICR(SCgRXIRQ)),d2    # flush
+
+        movm    (sp),[d2,d3,a2,a3]
+        bset    0x01,(gdbstub_busy)
+        beq     gdbstub_io_rx_enter
+        rti
+
+gdbstub_io_rx_overflow:
+        bset    0x01,(gdbstub_rx_overflow)
+        bra     gdbstub_io_rx_done
+
+###############################################################################
+#
+# debugging interrupt - enter the GDB stub proper
+#
+###############################################################################
+gdbstub_io_rx_enter:
+        or      EPSW_IE|EPSW_IM_1,epsw
+        add     -4,sp
+        SAVE_ALL
+
+        mov     0xffffffff,d0
+        mov     d0,(REG_ORIG_D0,fp)
+        mov     0x280,d1
+
+        mov     fp,d0
+        call    gdbstub_rx_irq[],0      # gdbstub_io_rx_irq(regs,excep)
+
+        and     ~EPSW_IE,epsw
+        bclr    0x01,(gdbstub_busy)
+
+        .globl gdbstub_return
+gdbstub_return:
+        RESTORE_ALL
+
+        .size   gdbstub_io_rx_handler,.-gdbstub_io_rx_handler