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Subject[PATCH 2/4] irqchip/loongson-eiointc: Add suspend/resume support
Date
Add suspend/resume support for EIOINTC irqchip, which is needed for
upcoming suspend/hibernation.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
drivers/irqchip/irq-loongson-eiointc.c | 31 ++++++++++++++++++++++++++
1 file changed, 31 insertions(+)

diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
index 16e9af8d8b1e..c68f8de3ae09 100644
--- a/drivers/irqchip/irq-loongson-eiointc.c
+++ b/drivers/irqchip/irq-loongson-eiointc.c
@@ -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 +302,35 @@ 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) {
+ irq_data = &desc->irq_data;
+ eiointc_set_irq_affinity(irq_data, irq_data->common->affinity, 0);
+ }
+ }
+ }
+}
+
+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 +410,7 @@ 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);
--
2.31.1
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