Commit a90335c2 authored by Huacai Chen's avatar Huacai Chen Committed by Marc Zyngier
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irqchip/loongson-eiointc: Add suspend/resume support 



Add suspend/resume support for EIOINTC irqchip, which is needed for
upcoming suspend/hibernation.

Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221020073527.541845-3-chenhuacai@loongson.cn
parent 1be356c9

drivers/irqchip/irq-loongson-eiointc.c

+33 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/of_platform.h>

#include <linux/syscore_ops.h>



#define EIOINTC_REG_NODEMAP	0x14a0

#define EIOINTC_REG_IPMAP	0x14c0
@@ -301,6 +302,37 @@ static struct irq_domain *acpi_get_vec_parent(int node, struct acpi_vector_group 
	return NULL;

}



static int eiointc_suspend(void)

{

	return 0;

}



static void eiointc_resume(void)

{

	int i, j;

	struct irq_desc *desc;

	struct irq_data *irq_data;



	eiointc_router_init(0);



	for (i = 0; i < nr_pics; i++) {

		for (j = 0; j < VEC_COUNT; j++) {

			desc = irq_resolve_mapping(eiointc_priv[i]->eiointc_domain, j);

			if (desc && desc->handle_irq && desc->handle_irq != handle_bad_irq) {

				raw_spin_lock(&desc->lock);

				irq_data = &desc->irq_data;

				eiointc_set_irq_affinity(irq_data, irq_data->common->affinity, 0);

				raw_spin_unlock(&desc->lock);

			}

		}

	}

}



static struct syscore_ops eiointc_syscore_ops = {

	.suspend = eiointc_suspend,

	.resume = eiointc_resume,

};



static int __init

pch_pic_parse_madt(union acpi_subtable_headers *header,

		       const unsigned long end)
@@ -380,6 +412,7 @@ int __init eiointc_acpi_init(struct irq_domain *parent, 
	parent_irq = irq_create_mapping(parent, acpi_eiointc->cascade);

	irq_set_chained_handler_and_data(parent_irq, eiointc_irq_dispatch, priv);



	register_syscore_ops(&eiointc_syscore_ops);

	cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_LOONGARCH_STARTING,

				  "irqchip/loongarch/intc:starting",

				  eiointc_router_init, NULL);