linux-kernel - [RFC 1/2] irqchip/loongson-eiointc: Route interrupt parsed from acpi table

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Message-Id: <20240821101153.2262290-2-maobibo@loongson.cn>
Date: Wed, 21 Aug 2024 18:11:52 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: WANG Xuerui <kernel@...0n.name>,
	Thomas Gleixner <tglx@...utronix.de>,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mips@...r.kernel.org
Subject: [RFC 1/2] irqchip/loongson-eiointc: Route interrupt parsed from acpi table

Interrupt controller eiointc routes irq to cpu interface IP0 - IP7,
now it is hard-coded that eiointc routes irq to CPU started from IP1.
It can be parsed from acpi table, instead hwirq is used for function
irq_create_mapping() already, routed interrupt pin must be the same
with parent hwirq.

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
 drivers/irqchip/irq-loongson-eiointc.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
index b1f2080be2be..e9ec63d85ee8 100644
--- a/drivers/irqchip/irq-loongson-eiointc.c
+++ b/drivers/irqchip/irq-loongson-eiointc.c
@@ -42,6 +42,7 @@ struct eiointc_priv {
 	cpumask_t		cpuspan_map;
 	struct fwnode_handle	*domain_handle;
 	struct irq_domain	*eiointc_domain;
+	int			parent_hwirq;
 };
 
 static struct eiointc_priv *eiointc_priv[MAX_IO_PICS];
@@ -159,7 +160,12 @@ static int eiointc_router_init(unsigned int cpu)
 		}
 
 		for (i = 0; i < eiointc_priv[0]->vec_count / 32 / 4; i++) {
-			bit = BIT(1 + index); /* Route to IP[1 + index] */
+			/*
+			 * Route to interrupt pin, using offset minus INT_HWI0
+			 * Offset 0 means IP0 and so on
+			 * Every 32 vector routing to one interrupt pin
+			 */
+			bit = BIT(eiointc_priv[index]->parent_hwirq - INT_HWI0);
 			data = bit | (bit << 8) | (bit << 16) | (bit << 24);
 			iocsr_write32(data, EIOINTC_REG_IPMAP + i * 4);
 		}
@@ -424,7 +430,7 @@ int __init eiointc_acpi_init(struct irq_domain *parent,
 
 	priv->vec_count = VEC_COUNT;
 	priv->node = acpi_eiointc->node;
-
+	priv->parent_hwirq = acpi_eiointc->cascade;
 	parent_irq = irq_create_mapping(parent, acpi_eiointc->cascade);
 
 	ret = eiointc_init(priv, parent_irq, acpi_eiointc->node_map);
@@ -458,6 +464,7 @@ static int __init eiointc_of_init(struct device_node *of_node,
 {
 	int parent_irq, ret;
 	struct eiointc_priv *priv;
+	struct irq_data *irq_data;
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
@@ -473,6 +480,12 @@ static int __init eiointc_of_init(struct device_node *of_node,
 	if (ret < 0)
 		goto out_free_priv;
 
+	irq_data = irq_get_irq_data(parent_irq);
+	if (!irq_data) {
+		ret = -ENODEV;
+		goto out_free_priv;
+	}
+
 	/*
 	 * In particular, the number of devices supported by the LS2K0500
 	 * extended I/O interrupt vector is 128.
@@ -484,7 +497,7 @@ static int __init eiointc_of_init(struct device_node *of_node,
 
 	priv->node = 0;
 	priv->domain_handle = of_node_to_fwnode(of_node);
-
+	priv->parent_hwirq = irqd_to_hwirq(irq_data);
 	ret = eiointc_init(priv, parent_irq, 0);
 	if (ret < 0)
 		goto out_free_priv;
-- 
2.39.3