/*
* Cirrus EP7312 Intererrupt handler
*
* Copyright (c) 2002 by Jay Monkman <jtm@smoothsmoothie.com>
*
* Copyright (c) 2002 by Charlie Steader <charlies@poliac.com>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
*
* http://www.OARcorp.com/rtems/license.html.
*
*
* $Id$
*/
#define __asm__
#include "irq.h"
#define VECTOR_TABLE 0x40
/*
* Function to obtain, execute an IT handler and acknowledge the IT
*/
.globl ExecuteITHandler
ExecuteITHandler :
/*
* Look at interrupt status register to determine source.
* From source, determine offset into expanded vector table
* and load handler address into r0.
*/
ldr r1, =0x80000000 /* close to interrupt status/mask registers 1 */
ldr r2, =0x80001000 /* close to interrupt status/mask registers 2 */
ldr r3, =0x80002000 /* close to interrupt status/mask registers 3 */
stmdb sp!,{r4, r5, r6}
/*
* INTSR3
*/
check_dai:
ldr r4, [r3, #0x240]
ldr r5, [r3, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
tst r6, #0x0001
beq check_extfiq
ldr r0, =(VECTOR_TABLE + (4 * 21)) /* load the vector number */
b get_handler
/*
* INTSR1
*/
check_extfiq:
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
tst r6, #0x0001
beq check_bl
ldr r0, =(VECTOR_TABLE + (4 * 0)) /* load the vector number */
b get_handler
check_bl:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0002
beq check_we
ldr r0, =(VECTOR_TABLE + (4 * 1)) /* load the vector number */
b get_handler
check_we:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0004
beq check_mc
ldr r0, =(VECTOR_TABLE + (4 * 2)) /* load the vector number */
b get_handler
check_mc:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0008
beq check_cs
ldr r0, =(VECTOR_TABLE + (4 * 3)) /* load the vector number */
b get_handler
check_cs:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0010
beq check_e1
ldr r0, =(VECTOR_TABLE + (4 * 4)) /* load the vector number */
b get_handler
check_e1:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0020
beq check_e2
ldr r0, =(VECTOR_TABLE + (4 * 5)) /* load the vector number */
b get_handler
check_e2:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0040
beq check_e3
ldr r0, =(VECTOR_TABLE + (4 * 6)) /* load the vector number */
b get_handler
check_e3:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0080
beq check_tc1
ldr r0, =(VECTOR_TABLE + (4 * 7)) /* load the vector number */
b get_handler
check_tc1:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0100
beq check_tc2
ldr r0, =(VECTOR_TABLE + (4 * 8)) /* load the vector number */
b get_handler
check_tc2:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0200
beq check_rtc
ldr r0, =(VECTOR_TABLE + (4 * 9)) /* load the vector number */
b get_handler
check_rtc:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0400
beq check_tick
ldr r0, =(VECTOR_TABLE + (4 * 10)) /* load the vector number */
b get_handler
check_tick:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0800
beq check_utx1
ldr r0, =(VECTOR_TABLE + (4 * 11)) /* load the vector number */
b get_handler
check_utx1:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x1000
beq check_urx1
ldr r0, =(VECTOR_TABLE + (4 * 12)) /* load the vector number */
b get_handler
check_urx1:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x2000
beq check_ums
ldr r0, =(VECTOR_TABLE + (4 * 13)) /* load the vector number */
b get_handler
check_ums:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x4000
beq check_sse
ldr r0, =(VECTOR_TABLE + (4 * 14)) /* load the vector number */
b get_handler
check_sse:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r1, #0x240]
ldr r5, [r1, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x8000
beq check_kbd
ldr r0, =(VECTOR_TABLE + (4 * 15)) /* load the vector number */
b get_handler
/*
* INTSR2
*/
check_kbd:
ldr r4, [r2, #0x240]
ldr r5, [r2, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
tst r6, #0x0001
beq check_ss2rx
ldr r0, =(VECTOR_TABLE + (4 * 16)) /* load the vector number */
b get_handler
check_ss2rx:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r2, #0x240]
ldr r5, [r2, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0002
beq check_ss2tx
ldr r0, =(VECTOR_TABLE + (4 * 17)) /* load the vector number */
b get_handler
check_ss2tx:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r2, #0x240]
ldr r5, [r2, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x0004
beq check_utx2
ldr r0, =(VECTOR_TABLE + (4 * 18)) /* load the vector number */
b get_handler
check_utx2:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r2, #0x240]
ldr r5, [r2, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x1000
beq check_urx2
ldr r0, =(VECTOR_TABLE + (4 * 19)) /* load the vector number */
b get_handler
check_urx2:
#if 0
MUST REMEMBER TO UNCOMMENT IF THIS HANDLER MOVES
ldr r4, [r2, #0x240]
ldr r5, [r2, #0x280]
and r6, r4, r5 /* only look at interrupts which are enabled */
#endif
tst r6, #0x2000
beq IRQ_NoInterrupt
ldr r0, =(VECTOR_TABLE + (4 * 20)) /* load the vector number */
b get_handler
get_handler:
ldmia sp!,{r4, r5, r6}
ldr r0, [r0] /* extract the IT handler @ */
/*
* re-enable interrupts at processor level as the current
* interrupt source is now masked via VEGA logic
*/
/*
mrs r1, cpsr
and r1, r1, #0xFFFFFF3F
msr cpsr, r1
*/
stmdb sp!,{lr}
ldr lr, =IRQ_return /* prepare the return from handler */
mov pc, r0 /* EXECUTE INT HANDLER */
IRQ_return:
ldmia sp!,{lr}
IRQ_NoInterrupt:
/* return to the "main" interrupt handler */
mov pc, lr
