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ARC: [intc] don't mask all IRQ by default

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Hardware keeps them enabled on reset, and Linux needs to keep status quo.
Any spurious interrupts will be reported/blocked by genirq.

This helps remove a SMP IRQ quirk (next commit), where a peripheral IRQ
is hard wired to core0, and request_irq()->unmask() happens on core1,
keeping the IRQ masked on core0, needing an explicit unmask.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2014-06-25 17:16:04 +05:30
parent c16e3e2283
commit 878f46c71e
1 changed files with 1 additions and 6 deletions
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7
arch/arc/kernel/irq.c
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@ -19,21 +19,16 @@
/*
* Early Hardware specific Interrupt setup
* -Platform independent, needed for each CPU (not foldable into init_IRQ)
* -Called very early (start_kernel -> setup_arch -> setup_processor)
* -Platform Independent (must for any ARC700)
* -Needed for each CPU (hence not foldable into init_IRQ)
*
* what it does ?
* -Disable all IRQs (on CPU side)
* -Optionally, setup the High priority Interrupts as Level 2 IRQs
*/
void arc_init_IRQ(void)
{
int level_mask = 0;
/* Disable all IRQs: enable them as devices request */
write_aux_reg(AUX_IENABLE, 0);
/* setup any high priority Interrupts (Level2 in ARCompact jargon) */
level_mask |= IS_ENABLED(CONFIG_ARC_IRQ3_LV2) << 3;
level_mask |= IS_ENABLED(CONFIG_ARC_IRQ5_LV2) << 5;