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