[irqchip:,irq/irqchip-next] irqchip/loongson-htvec: Add suspend/resume support
Commit Message
The following commit has been merged into the irq/irqchip-next branch of irqchip:
Commit-ID: 1be356c9326d68c9b0161ca004a41f203864d7ee
Gitweb: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/1be356c9326d68c9b0161ca004a41f203864d7ee
Author: Huacai Chen <chenhuacai@loongson.cn>
AuthorDate: Thu, 20 Oct 2022 15:35:24 +08:00
Committer: Marc Zyngier <maz@kernel.org>
CommitterDate: Sat, 26 Nov 2022 13:09:25
irqchip/loongson-htvec: Add suspend/resume support
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
---
drivers/irqchip/irq-loongson-htvec.c | 27 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+)
@@ -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;
iounmap_base: