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/*
* linux/arch/mips/tx4927/common/tx4927_irq_handler.S
*
* Primary interrupt handler for tx4927 based systems
*
* Author: MontaVista Software, Inc.
* Author: jsun@mvista.com or jsun@junsun.net
* source@mvista.com
*
* Copyright 2001-2002 MontaVista Software Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <asm/asm.h>
#include <asm/mipsregs.h>
#include <asm/addrspace.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
#include <asm/tx4927/tx4927.h>
.align 5
NESTED(tx4927_irq_handler, PT_SIZE, sp)
SAVE_ALL
CLI
.set at
mfc0 t0, CP0_CAUSE
mfc0 t1, CP0_STATUS
and t0, t1
andi t1, t0, STATUSF_IP7 /* cpu timer */
bnez t1, ll_ip7
/* IP6..IP3 multiplexed -- do not use */
andi t1, t0, STATUSF_IP2 /* tx4927 pic */
bnez t1, ll_ip2
andi t1, t0, STATUSF_IP0 /* user line 0 */
bnez t1, ll_ip0
andi t1, t0, STATUSF_IP1 /* user line 1 */
bnez t1, ll_ip1
.set reorder
/* wrong alarm or masked ... */
jal spurious_interrupt
nop
j ret_from_irq
END(tx4927_irq_handler)
.align 5
ll_ip7:
li a0, TX4927_IRQ_CPU_TIMER
move a1, sp
jal do_IRQ
j ret_from_irq
ll_ip2:
jal tx4927_irq_nested
nop
beqz v0, goto_spurious_interrupt
nop
move a0, v0
move a1, sp
jal do_IRQ
j ret_from_irq
goto_spurious_interrupt:
j spurious_interrupt
nop
ll_ip1:
li a0, TX4927_IRQ_USER1
move a1, sp
jal do_IRQ
j ret_from_irq
ll_ip0:
li a0, TX4927_IRQ_USER0
move a1, sp
jal do_IRQ
j ret_from_irq
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