/*
* include/asm-arm/arch-s3c2410/entry-macro.S
*
* Low-level IRQ helper macros for S3C2410-based platforms
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
/* We have a problem that the INTOFFSET register does not always
* show one interrupt. Occasionally we get two interrupts through
* the prioritiser, and this causes the INTOFFSET register to show
* what looks like the logical-or of the two interrupt numbers.
*
* Thanks to Klaus, Shannon, et al for helping to debug this problem
*/
#define INTPND (0x10)
#define INTOFFSET (0x14)
#define EXTINTPEND (0xa8)
#define EXTINTMASK (0xa4)
#include <asm/hardware.h>
#include <asm/arch/irqs.h>
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
mov \base, #S3C24XX_VA_IRQ
ldr \irqstat, [ \base, #INTPND]
bics \irqnr, \irqstat, #3<<4 @@ only an GPIO IRQ
beq 2000f
@@ try the interrupt offset register, since it is there
ldr \irqnr, [ \base, #INTOFFSET ]
mov \tmp, #1
tst \irqstat, \tmp, lsl \irqnr
addne \irqnr, \irqnr, #IRQ_EINT0
bne 1001f
@@ the number specified is not a valid irq, so try
@@ and work it out for ourselves
mov \irqnr, #IRQ_EINT0 @@ start here
b 3000f
2000:
@@ load the GPIO interrupt register, and check it
add \tmp, \base, #S3C24XX_VA_GPIO - S3C24XX_VA_IRQ
ldr \irqstat, [ \tmp, # EXTINTPEND ]
ldr \irqnr, [ \tmp, # EXTINTMASK ]
bics \irqstat, \irqstat, \irqnr
beq 1001f
mov \irqnr, #(IRQ_EINT4 - 4)
@@ work out which irq (if any) we got
3000:
movs \tmp, \irqstat, lsl#16
addeq \irqnr, \irqnr, #16
moveq \irqstat, \irqstat, lsr#16
tst \irqstat, #0xff
addeq \irqnr, \irqnr, #8
moveq \irqstat, \irqstat, lsr#8
tst \irqstat, #0xf
addeq \irqnr, \irqnr, #4
moveq \irqstat, \irqstat, lsr#4
tst \irqstat, #0x3
addeq \irqnr, \irqnr, #2
moveq \irqstat, \irqstat, lsr#2
tst \irqstat, #0x1
addeq \irqnr, \irqnr, #1
@@ we have the value
movs \irqnr, \irqnr
1001:
@@ exit here, Z flag unset if IRQ
.endm
/* currently don't need an disable_fiq macro */
.macro disable_fiq
.endm
