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Commit 878f46c7 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

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



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: default avatarVineet Gupta <vgupta@synopsys.com>
parent c16e3e22

arch/arc/kernel/irq.c

+1 −6
Original line number Diff line number Diff line
@@ -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;