linux/arch/mn10300/kernel/gdb-io-ttysm-low.S
David Howells b920de1b77 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>
2008-02-08 09:22:30 -08:00

93 lines
2.4 KiB
ArmAsm

###############################################################################
#
# 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