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| author | Kenneth Tan <chong.yin.tan@intel.com> | 2005-10-18 07:53:35 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-10-18 07:53:35 +0100 |
| commit | 251b928cdff5f12e7da8f56e8933e2b58ba08456 (patch) | |
| tree | dc978d9a44e865063b1cfb4606c03bae1b6e4eab /include/asm-arm/arch-ixp4xx | |
| parent | ad1b472bea1bbcd8dc7fd92f6952d8b2d8355edb (diff) | |
| download | op-kernel-dev-251b928cdff5f12e7da8f56e8933e2b58ba08456.zip op-kernel-dev-251b928cdff5f12e7da8f56e8933e2b58ba08456.tar.gz | |
[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: Kenneth Tan <chong.yin.tan@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/asm-arm/arch-ixp4xx')
| -rw-r--r-- | include/asm-arm/arch-ixp4xx/entry-macro.S | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/include/asm-arm/arch-ixp4xx/entry-macro.S b/include/asm-arm/arch-ixp4xx/entry-macro.S index 455da64..323b0bc 100644 --- a/include/asm-arm/arch-ixp4xx/entry-macro.S +++ b/include/asm-arm/arch-ixp4xx/entry-macro.S @@ -15,25 +15,26 @@ ldr \irqstat, =(IXP4XX_INTC_BASE_VIRT+IXP4XX_ICIP_OFFSET) ldr \irqstat, [\irqstat] @ get interrupts cmp \irqstat, #0 - beq 1001f + beq 1001f @ upper IRQ? clz \irqnr, \irqstat mov \base, #31 - subs \irqnr, \base, \irqnr + sub \irqnr, \base, \irqnr + b 1002f @ lower IRQ being + @ handled 1001: /* * IXP465 has an upper IRQ status register */ #if defined(CONFIG_CPU_IXP46X) - bne 1002f ldr \irqstat, =(IXP4XX_INTC_BASE_VIRT+IXP4XX_ICIP2_OFFSET) ldr \irqstat, [\irqstat] @ get upper interrupts mov \irqnr, #63 clz \irqstat, \irqstat cmp \irqstat, #32 subne \irqnr, \irqnr, \irqstat -1002: #endif +1002: .endm |
