1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
120 lines
2.9 KiB
ArmAsm
120 lines
2.9 KiB
ArmAsm
/*
|
|
* 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.
|
|
|
|
* Modifications:
|
|
* 10-Mar-2005 LCVR Changed S3C2410_VA to S3C24XX_VA
|
|
*/
|
|
|
|
|
|
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
|
|
|
|
mov \tmp, #S3C24XX_VA_IRQ
|
|
ldr \irqnr, [ \tmp, #0x14 ] @ get irq no
|
|
30000:
|
|
teq \irqnr, #4
|
|
teqne \irqnr, #5
|
|
beq 1002f @ external irq reg
|
|
|
|
@ debug check to see if interrupt reported is the same
|
|
@ as the offset....
|
|
|
|
teq \irqnr, #0
|
|
beq 20002f
|
|
ldr \irqstat, [ \tmp, #0x10 ] @ INTPND
|
|
mov \irqstat, \irqstat, lsr \irqnr
|
|
tst \irqstat, #1
|
|
bne 20002f
|
|
|
|
/* debug/warning if we get an invalud response from the
|
|
* INTOFFSET register */
|
|
#if 1
|
|
stmfd r13!, { r0 - r4 , r8-r12, r14 }
|
|
ldr r1, [ \tmp, #0x14 ] @ INTOFFSET
|
|
ldr r2, [ \tmp, #0x10 ] @ INTPND
|
|
ldr r3, [ \tmp, #0x00 ] @ SRCPND
|
|
adr r0, 20003f
|
|
bl printk
|
|
b 20004f
|
|
|
|
20003:
|
|
.ascii "<7>irq: err - bad offset %d, intpnd=%08x, srcpnd=%08x\n"
|
|
.byte 0
|
|
.align 4
|
|
20004:
|
|
mov r1, #1
|
|
mov \tmp, #S3C24XX_VA_IRQ
|
|
ldmfd r13!, { r0 - r4 , r8-r12, r14 }
|
|
#endif
|
|
|
|
@ try working out interrupt number for ourselves
|
|
mov \irqnr, #0
|
|
ldr \irqstat, [ \tmp, #0x10 ] @ INTPND
|
|
10021:
|
|
movs \irqstat, \irqstat, lsr#1
|
|
bcs 30000b @ try and re-start the proccess
|
|
add \irqnr, \irqnr, #1
|
|
cmp \irqnr, #32
|
|
ble 10021b
|
|
|
|
@ found no interrupt, set Z flag and leave
|
|
movs \irqnr, #0
|
|
b 1001f
|
|
|
|
20005:
|
|
20002: @ exit
|
|
@ we base the s3c2410x interrupts at 16 and above to allow
|
|
@ isa peripherals to have their standard interrupts, also
|
|
@ ensure that Z flag is un-set on exit
|
|
|
|
@ note, we cannot be sure if we get IRQ_EINT0 (0) that
|
|
@ there is simply no interrupt pending, so in all other
|
|
@ cases we jump to say we have found something, otherwise
|
|
@ we check to see if the interrupt really is assrted
|
|
adds \irqnr, \irqnr, #IRQ_EINT0
|
|
teq \irqnr, #IRQ_EINT0
|
|
bne 1001f @ exit
|
|
ldr \irqstat, [ \tmp, #0x10 ] @ INTPND
|
|
teq \irqstat, #0
|
|
moveq \irqnr, #0
|
|
b 1001f
|
|
|
|
@ we get here from no main or external interrupts pending
|
|
1002:
|
|
add \tmp, \tmp, #S3C24XX_VA_GPIO - S3C24XX_VA_IRQ
|
|
ldr \irqstat, [ \tmp, # 0xa8 ] @ EXTINTPEND
|
|
ldr \irqnr, [ \tmp, # 0xa4 ] @ EXTINTMASK
|
|
|
|
bic \irqstat, \irqstat, \irqnr @ clear masked irqs
|
|
|
|
mov \irqnr, #IRQ_EINT4 @ start extint nos
|
|
mov \irqstat, \irqstat, lsr#4 @ ignore bottom 4 bits
|
|
10021:
|
|
movs \irqstat, \irqstat, lsr#1
|
|
bcs 1004f
|
|
add \irqnr, \irqnr, #1
|
|
cmp \irqnr, #IRQ_EINT23
|
|
ble 10021b
|
|
|
|
@ found no interrupt, set Z flag and leave
|
|
movs \irqnr, #0
|
|
|
|
1004: @ ensure Z flag clear in case our MOVS shifted out the last bit
|
|
teq \irqnr, #0
|
|
1001:
|
|
@ exit irq routine
|
|
.endm
|
|
|
|
|
|
/* currently don't need an disable_fiq macro */
|
|
|
|
.macro disable_fiq
|
|
.endm
|
|
|
|
|