[PATCH V11 06/10] irqchip/loongson-htvec: Add suspend/resume support

Huacai Chen
2022-04-30T08:59:43Z

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

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
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 e304374a018c..8cd1c15c1f07 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>

/* Registers */
#define HTVEC_EN_OFF 0x20
@@ -30,6 +31,7 @@ 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;
@@ -157,6 +159,29 @@ 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)
{
@@ -190,6 +215,8 @@ static int htvec_init(phys_addr_t addr, unsigned long size,

htvec_priv = priv;

+ register_syscore_ops(&htvec_syscore_ops);
+
return 0;

iounmap_base:
--
2.27.0