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m68k/irq - Use polled IRQ flag for MFP timer cascaded interrupts

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Some Atari hardware has no capacity to raise interrupts (e.g.
network or USB adapter hardware attached via ROM port). The driver
interrupt routine is called from a timer interrupt (timer D) in
these cases, using chained device specific pseudo interrupts
(IRQ_MFP_TIMER1 ff.)

These interrupts will more often than not, return IRQ_NONE as
there is not always work for the device handler when called.
Too many unhandled interrupts will result in the interrupt
being disabled by the stuck interrupt watchdog.

As preferred option to flag interrupts as needing exclusion
from the watchdog mechanism, tglx added the IRQ_IS_POLLED flag
for use in such a case. Currently, two interrupts need to use
this flag. Add more users as needed.

Signed-off-by: Michael Schmitz <schmitz@debian.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Michael Schmitz 2014-01-11 13:58:55 +13:00 committed by Geert Uytterhoeven
parent a16f9a42a5
commit a0b7b24226
1 changed files with 3 additions and 0 deletions
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3
arch/m68k/atari/ataints.c
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@ -333,6 +333,9 @@ void __init atari_init_IRQ(void)
m68k_setup_irq_controller(&atari_mfptimer_chip, handle_simple_irq,
IRQ_MFP_TIMER1, 8);
irq_set_status_flags(IRQ_MFP_TIMER1, IRQ_IS_POLLED);
irq_set_status_flags(IRQ_MFP_TIMER2, IRQ_IS_POLLED);
/* prepare timer D data for use as poll interrupt */
/* set Timer D data Register - needs to be > 0 */
st_mfp.tim_dt_d = 254; /* < 100 Hz */