Commit 1be356c9 authored by Huacai Chen's avatar Huacai Chen Committed by Marc Zyngier
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irqchip/loongson-htvec: Add suspend/resume support 



Add suspend/resume support for HTVEC 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/20221020073527.541845-2-chenhuacai@loongson.cn
parent 70f7b6c0

drivers/irqchip/irq-loongson-htvec.c

+27 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/of_platform.h>

#include <linux/syscore_ops.h>



/* Registers */

#define HTVEC_EN_OFF		0x20
@@ -29,6 +30,7 @@ struct htvec { 
	void __iomem		*base;

	struct irq_domain	*htvec_domain;

	raw_spinlock_t		htvec_lock;

	u32			saved_vec_en[HTVEC_MAX_PARENT_IRQ];

};



static struct htvec *htvec_priv;
@@ -156,6 +158,29 @@ static void htvec_reset(struct htvec *priv) 
	}

}



static int htvec_suspend(void)

{

	int i;



	for (i = 0; i < htvec_priv->num_parents; i++)

		htvec_priv->saved_vec_en[i] = readl(htvec_priv->base + HTVEC_EN_OFF + 4 * i);



	return 0;

}



static void htvec_resume(void)

{

	int i;



	for (i = 0; i < htvec_priv->num_parents; i++)

		writel(htvec_priv->saved_vec_en[i], htvec_priv->base + HTVEC_EN_OFF + 4 * i);

}



static struct syscore_ops htvec_syscore_ops = {

	.suspend = htvec_suspend,

	.resume = htvec_resume,

};



static int htvec_init(phys_addr_t addr, unsigned long size,

		int num_parents, int parent_irq[], struct fwnode_handle *domain_handle)

{
@@ -188,6 +213,8 @@ static int htvec_init(phys_addr_t addr, unsigned long size, 


	htvec_priv = priv;



	register_syscore_ops(&htvec_syscore_ops);



	return 0;



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