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From: Huacai Chen <chenhuacai@loongson.cn>
To: Thomas Gleixner <tglx@linutronix.de>, Marc Zyngier <maz@kernel.org>
Cc: linux-kernel@vger.kernel.org, Xuefeng Li <lixuefeng@loongson.cn>,
	Huacai Chen <chenhuacai@gmail.com>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>,
	Huacai Chen <chenhuacai@loongson.cn>
Subject: [PATCH V3 03/10] irqchip/loongson-pch-pic: Add suspend/resume support
Date: Wed, 25 Aug 2021 14:11:45 +0800	[thread overview]
Message-ID: <20210825061152.3396398-4-chenhuacai@loongson.cn> (raw)
In-Reply-To: <20210825061152.3396398-1-chenhuacai@loongson.cn>

Add suspend/resume support for PCH-PIC irqchip, which is needed for
suspend/hibernation.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
 drivers/irqchip/irq-loongson-pch-pic.c | 47 ++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
index 769e8ef415a2..72d5bfbca843 100644
--- a/drivers/irqchip/irq-loongson-pch-pic.c
+++ b/drivers/irqchip/irq-loongson-pch-pic.c
@@ -15,6 +15,7 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
+#include <linux/syscore_ops.h>
 
 /* Registers */
 #define PCH_PIC_MASK		0x20
@@ -41,6 +42,9 @@ struct pch_pic {
 	struct fwnode_handle	*domain_handle;
 	u32			ht_vec_base;
 	raw_spinlock_t		pic_lock;
+	u32			saved_vec_en[PIC_REG_COUNT];
+	u32			saved_vec_pol[PIC_REG_COUNT];
+	u32			saved_vec_edge[PIC_REG_COUNT];
 };
 
 struct pch_pic *pch_pic_priv[4];
@@ -142,6 +146,7 @@ static struct irq_chip pch_pic_irq_chip = {
 	.irq_ack		= pch_pic_ack_irq,
 	.irq_set_affinity	= irq_chip_set_affinity_parent,
 	.irq_set_type		= pch_pic_set_type,
+	.flags			= IRQCHIP_SKIP_SET_WAKE,
 };
 
 static int pch_pic_alloc(struct irq_domain *domain, unsigned int virq,
@@ -203,6 +208,46 @@ static void pch_pic_reset(struct pch_pic *priv)
 	}
 }
 
+static int pch_pic_suspend(void)
+{
+	int i, j;
+
+	for (i = 0; i < nr_pch_pics; i++) {
+		for (j = 0; j < PIC_REG_COUNT; j++) {
+			pch_pic_priv[i]->saved_vec_pol[j] =
+				readl(pch_pic_priv[i]->base + PCH_PIC_POL + 4 * j);
+			pch_pic_priv[i]->saved_vec_edge[j] =
+				readl(pch_pic_priv[i]->base + PCH_PIC_EDGE + 4 * j);
+			pch_pic_priv[i]->saved_vec_en[j] =
+				readl(pch_pic_priv[i]->base + PCH_PIC_MASK + 4 * j);
+		}
+	}
+
+	return 0;
+}
+
+static void pch_pic_resume(void)
+{
+	int i, j;
+
+	for (i = 0; i < nr_pch_pics; i++) {
+		pch_pic_reset(pch_pic_priv[i]);
+		for (j = 0; j < PIC_REG_COUNT; j++) {
+			writel(pch_pic_priv[i]->saved_vec_pol[j],
+					pch_pic_priv[i]->base + PCH_PIC_POL + 4 * j);
+			writel(pch_pic_priv[i]->saved_vec_edge[j],
+					pch_pic_priv[i]->base + PCH_PIC_EDGE + 4 * j);
+			writel(pch_pic_priv[i]->saved_vec_en[j],
+					pch_pic_priv[i]->base + PCH_PIC_MASK + 4 * j);
+		}
+	}
+}
+
+static struct syscore_ops pch_pic_syscore_ops = {
+	.suspend =  pch_pic_suspend,
+	.resume =  pch_pic_resume,
+};
+
 static int pch_pic_init(phys_addr_t addr, unsigned long size, int vec_base,
 			struct irq_domain *parent_domain, struct fwnode_handle *domain_handle)
 {
@@ -235,6 +280,8 @@ static int pch_pic_init(phys_addr_t addr, unsigned long size, int vec_base,
 	pch_pic_reset(priv);
 	pch_pic_priv[nr_pch_pics++] = priv;
 
+	register_syscore_ops(&pch_pic_syscore_ops);
+
 	return 0;
 
 iounmap_base:
-- 
2.27.0


  parent reply	other threads:[~2021-08-25  6:13 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-25  6:11 [PATCH V3 00/10] irqchip: Add LoongArch-related irqchip drivers Huacai Chen
2021-08-25  6:11 ` [PATCH V3 01/10] irqchip: Adjust Kconfig for Loongson Huacai Chen
2021-08-25  6:11 ` [PATCH V3 02/10] irqchip/loongson-pch-pic: Add ACPI init support Huacai Chen
2021-08-25  6:11 ` Huacai Chen [this message]
2021-08-25  6:11 ` [PATCH V3 04/10] irqchip/loongson-pch-msi: " Huacai Chen
2021-08-25  6:11 ` [PATCH V3 05/10] irqchip/loongson-htvec: " Huacai Chen
2021-08-25  6:11 ` [PATCH V3 06/10] irqchip/loongson-htvec: Add suspend/resume support Huacai Chen
2021-08-25  6:11 ` [PATCH V3 07/10] irqchip/loongson-liointc: Add ACPI init support Huacai Chen
2021-08-25  6:11 ` [PATCH V3 08/10] irqchip: Add LoongArch CPU interrupt controller support Huacai Chen
2021-08-25  8:40   ` Marc Zyngier
2021-08-27  8:12     ` Huacai Chen
2021-08-28 10:07     ` Huacai Chen
2021-08-28 11:07       ` Marc Zyngier
2021-08-29  9:37         ` Huacai Chen
2021-08-29 10:10           ` Marc Zyngier
2021-08-29 10:34             ` Huacai Chen
2021-08-29 11:00               ` Marc Zyngier
2021-08-30  3:19                 ` Huacai Chen
2021-08-25  6:11 ` [PATCH V3 09/10] irqchip: Add Loongson Extended I/O " Huacai Chen
2021-08-25  6:11 ` [PATCH V3 10/10] irqchip: Add Loongson PCH LPC " Huacai Chen

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