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irqchip/loongson-eiointc: Add suspend/resume support

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

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221020073527.541845-3-chenhuacai@loongson.cn
This commit is contained in:
Huacai Chen 2022-10-20 15:35:25 +08:00 committed by Marc Zyngier
parent 1be356c932
commit a90335c2df
1 changed files with 33 additions and 0 deletions
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33
drivers/irqchip/irq-loongson-eiointc.c
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@ -17,6 +17,7 @@
#include <linux/of_address.h> #include <linux/of_address.h>
#include <linux/of_irq.h> #include <linux/of_irq.h>
#include <linux/of_platform.h> #include <linux/of_platform.h>
#include <linux/syscore_ops.h>
#define EIOINTC_REG_NODEMAP 0x14a0 #define EIOINTC_REG_NODEMAP 0x14a0
#define EIOINTC_REG_IPMAP 0x14c0 #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; 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 static int __init
pch_pic_parse_madt(union acpi_subtable_headers *header, pch_pic_parse_madt(union acpi_subtable_headers *header,
const unsigned long end) 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); parent_irq = irq_create_mapping(parent, acpi_eiointc->cascade);
irq_set_chained_handler_and_data(parent_irq, eiointc_irq_dispatch, priv); 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, cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_LOONGARCH_STARTING,
"irqchip/loongarch/intc:starting", "irqchip/loongarch/intc:starting",
eiointc_router_init, NULL); eiointc_router_init, NULL);