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SiRF internal interrupts are using level trigger. we need to tell the irq
core this information. otherwise, we might get some problems as below
1. disable_irq(n)
here irq core will mark the disabled flag but still keep the irq enabled
due to involved lazy-disable
2. doing someting after disable_irq(n)
in step 2, if one interrupt n comes, irq core will mark it as pending and
mask the HW interrupt really. we name the coming interrupt as "X".
3. enable_irq(n)
this will unmask the interrupt, so the level-trigger HW interrupt will come
again, irq_handler will enter as "E1". after that, irq core will also check
whether irq n is pending, if yes, and pending interrupt is not level-trigger,
irq core will execute the pending irq_handler.
so if we don't set the IRQ_LEVEL flag here, irq core will execute pending
X again as "E2", but actually the pending interrupt has been handled by "E1".
that makes a level-trigger HW interrupt is executed twice.
here we fix the issue to avoid redundant interrupt overload.
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Huayi Li <Huayi.Li@csr.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
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the series of patches for irqdomain core in 3.11 has broken sirf
irq which uses legacy mapping. all users fail in the new kernel
while setupping irq.
this patch moves to linear irqdomain and drop old legacy irqdomain
codes since we don't need it any more, and at the same time, it
also fixes the broken interrupts of sirfsoc in 3.11.
on the other hand, we actually only have 64 interrupt sources for
prima2 and atlas6, but there are 128 interrupt souces for marco
which uses GIC. in the legacy codes, sirf gpio also uses legacy
irqdomain, so to make gpio interrupt mapping not depend on the
prima2/atlas6/marco an use unified marco,we enlarge prima2/atlas6
interrupt number to 128. here we don't need this workaround any
more as sirf gpio also moved to linear mode before. so we move
SIRFSOC_NUM_IRQS back to 64 too.
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
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This updates the irqchip drier for prima2 to the current practices by
moving it into drivers/irqchip and integrating it into the irqchip_init
infrastructure. We also now use a linear irq domain as a preparation
for sparse IRQ suport.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
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