[PATCH RFC V2 07/10] irqchip/loongson-htvec: Add suspend/resume support

[Jianmin Lv]

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

Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
Signed-off-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
---
 drivers/irqchip/irq-loongson-htvec.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/irqchip/irq-loongson-htvec.c b/drivers/irqchip/irq-loongson-htvec.c
index 354630b..a3c60e3 100644
--- a/drivers/irqchip/irq-loongson-htvec.c
+++ b/drivers/irqchip/irq-loongson-htvec.c
@@ -16,6 +16,7 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
+#include <linux/syscore_ops.h>
 #include "irq-loongarch-pic-common.h"
 
 /* Registers */
@@ -31,6 +32,7 @@ struct htvec {
 	struct irq_domain	*htvec_domain;
 	raw_spinlock_t		htvec_lock;
 	struct fwnode_handle	*domain_handle;
+	u32			saved_vec_en[HTVEC_MAX_PARENT_IRQ];
 };
 
 static struct htvec *htvec_priv;
@@ -158,6 +160,29 @@ 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)
 {
@@ -193,6 +218,8 @@ static int htvec_init(phys_addr_t addr, unsigned long size,
 
 	register_syscore_ops(&htvec_syscore_ops);
 
+	register_syscore_ops(&htvec_syscore_ops);
+
 	return 0;
 
 iounmap_base:
-- 
1.8.3.1