Commit 251b928c authored by Kenneth Tan's avatar Kenneth Tan Committed by Russell King
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[ARM] 3021/1: Interrupt 0 bug fix for ixp4xx

Patch from Kenneth Tan

The get_irqnr_and_base subroutine of ixp4xx does not take interrupt 0 condition into account properly. We should not perform "subs" here. The Z flag will be set when interrupt 0 occur, which resulting "movne r1, sp" in the caller routine (irq_handler) not being executed.

When interrupt 0 occur:
o if CONFIG_CPU_IXP46X is not set, "subs" will set the Z flag and return
o if CONFIG_CPU_IXP46X is set, codes in upper interrupt handling will be trigerred. But since this is not supper interrupt, the "cmp" in the upper interrupt handling portion will set the Z flag and return
Signed-off-by: default avatarKenneth Tan <>
Signed-off-by: default avatarRussell King <>
parent ad1b472b
...@@ -15,25 +15,26 @@ ...@@ -15,25 +15,26 @@
ldr \irqstat, [\irqstat] @ get interrupts ldr \irqstat, [\irqstat] @ get interrupts
cmp \irqstat, #0 cmp \irqstat, #0
beq 1001f beq 1001f @ upper IRQ?
clz \irqnr, \irqstat clz \irqnr, \irqstat
mov \base, #31 mov \base, #31
subs \irqnr, \base, \irqnr sub \irqnr, \base, \irqnr
b 1002f @ lower IRQ being
@ handled
1001: 1001:
/* /*
* IXP465 has an upper IRQ status register * IXP465 has an upper IRQ status register
*/ */
#if defined(CONFIG_CPU_IXP46X) #if defined(CONFIG_CPU_IXP46X)
bne 1002f
ldr \irqstat, [\irqstat] @ get upper interrupts ldr \irqstat, [\irqstat] @ get upper interrupts
mov \irqnr, #63 mov \irqnr, #63
clz \irqstat, \irqstat clz \irqstat, \irqstat
cmp \irqstat, #32 cmp \irqstat, #32
subne \irqnr, \irqnr, \irqstat subne \irqnr, \irqnr, \irqstat
#endif #endif
.endm .endm
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