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irqchip/loongson-htvec: Add suspend/resume support

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Add suspend/resume support for HTVEC 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/20221020073527.541845-2-chenhuacai@loongson.cn
This commit is contained in:
Huacai Chen 2022-10-20 15:35:24 +08:00 committed by Marc Zyngier
parent 70f7b6c008
commit 1be356c932
1 changed files with 27 additions and 0 deletions
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27
drivers/irqchip/irq-loongson-htvec.c
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@ -16,6 +16,7 @@
#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>
/* Registers */ /* Registers */
#define HTVEC_EN_OFF 0x20 #define HTVEC_EN_OFF 0x20
@ -29,6 +30,7 @@ struct htvec {
void __iomem *base; void __iomem *base;
struct irq_domain *htvec_domain; struct irq_domain *htvec_domain;
raw_spinlock_t htvec_lock; raw_spinlock_t htvec_lock;
u32 saved_vec_en[HTVEC_MAX_PARENT_IRQ];
}; };
static struct htvec *htvec_priv; 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, static int htvec_init(phys_addr_t addr, unsigned long size,
int num_parents, int parent_irq[], struct fwnode_handle *domain_handle) 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; htvec_priv = priv;
register_syscore_ops(&htvec_syscore_ops);
return 0; return 0;
iounmap_base: iounmap_base: