linux-kernel - [PATCH 4/9] irqchip/loongson-pch-msi: Add ACPI init support

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Date:   Tue,  6 Jul 2021 11:08:59 +0800
From:   Huacai Chen <chenhuacai@...ngson.cn>
To:     Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
        Huacai Chen <chenhuacai@...il.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH 4/9] irqchip/loongson-pch-msi: Add ACPI init support

We are preparing to add new Loongson (based on LoongArch, not MIPS)
support. LoongArch use ACPI other than DT as its boot protocol, so
add ACPI init support.

Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 drivers/irqchip/irq-loongson-pch-msi.c | 69 ++++++++++++++++++++++++--
 1 file changed, 64 insertions(+), 5 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-pch-msi.c b/drivers/irqchip/irq-loongson-pch-msi.c
index 32562b7e681b..adfa30046f0a 100644
--- a/drivers/irqchip/irq-loongson-pch-msi.c
+++ b/drivers/irqchip/irq-loongson-pch-msi.c
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
  *  Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@...goat.com>
+ *			Jianmin Lv <lvjianmin@...ngson.cn>
+ *			Huacai Chen <chenhuacai@...ngson.cn>
  *  Loongson PCH MSI support
  */
 
@@ -21,6 +23,7 @@ struct pch_msi_data {
 	u32		irq_first;	/* The vector number that MSIs starts */
 	u32		num_irqs;	/* The number of vectors for MSIs */
 	unsigned long	*msi_map;
+	struct fwnode_handle *domain_handle;
 };
 
 static void pch_msi_mask_msi_irq(struct irq_data *d)
@@ -159,7 +162,12 @@ static int pch_msi_init_domains(struct pch_msi_data *priv,
 {
 	struct irq_domain *middle_domain, *msi_domain;
 
-	middle_domain = irq_domain_create_linear(of_node_to_fwnode(node),
+	if (node)
+		priv->domain_handle = of_node_to_fwnode(node);
+	else
+		priv->domain_handle = irq_domain_alloc_fwnode((phys_addr_t *)priv);
+
+	middle_domain = irq_domain_create_linear(priv->domain_handle,
 						priv->num_irqs,
 						&pch_msi_middle_domain_ops,
 						priv);
@@ -171,7 +179,7 @@ static int pch_msi_init_domains(struct pch_msi_data *priv,
 	middle_domain->parent = parent;
 	irq_domain_update_bus_token(middle_domain, DOMAIN_BUS_NEXUS);
 
-	msi_domain = pci_msi_create_irq_domain(of_node_to_fwnode(node),
+	msi_domain = pci_msi_create_irq_domain(priv->domain_handle,
 					       &pch_msi_domain_info,
 					       middle_domain);
 	if (!msi_domain) {
@@ -183,8 +191,9 @@ static int pch_msi_init_domains(struct pch_msi_data *priv,
 	return 0;
 }
 
-static int pch_msi_init(struct device_node *node,
-			    struct device_node *parent)
+#ifdef CONFIG_OF
+
+int pch_msi_of_init(struct device_node *node, struct device_node *parent)
 {
 	struct pch_msi_data *priv;
 	struct irq_domain *parent_domain;
@@ -247,4 +256,54 @@ static int pch_msi_init(struct device_node *node,
 	return ret;
 }
 
-IRQCHIP_DECLARE(pch_msi, "loongson,pch-msi-1.0", pch_msi_init);
+IRQCHIP_DECLARE(pch_msi, "loongson,pch-msi-1.0", pch_msi_of_init);
+
+#endif
+
+#ifdef CONFIG_ACPI
+
+struct fwnode_handle *pch_msi_acpi_init(struct fwnode_handle *parent,
+					struct acpi_madt_msi_pic *acpi_pchmsi)
+{
+	int ret;
+	struct pch_msi_data *priv;
+	struct irq_domain *parent_domain;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return NULL;
+
+	mutex_init(&priv->msi_map_lock);
+
+	priv->doorbell = acpi_pchmsi->msg_address;
+	priv->irq_first = acpi_pchmsi->start;
+	priv->num_irqs = acpi_pchmsi->count;
+
+	parent_domain = irq_find_matching_fwnode(parent, DOMAIN_BUS_ANY);
+	if (!parent_domain) {
+		pr_err("Failed to find the parent domain\n");
+		return NULL;
+	}
+
+	priv->msi_map = bitmap_zalloc(priv->num_irqs, GFP_KERNEL);
+	if (!priv->msi_map)
+		goto err_priv;
+
+	pr_debug("Registering %d MSIs, starting at %d\n",
+		 priv->num_irqs, priv->irq_first);
+
+	ret = pch_msi_init_domains(priv, NULL, parent_domain);
+	if (ret)
+		goto err_map;
+
+	return priv->domain_handle;
+
+err_map:
+	kfree(priv->msi_map);
+err_priv:
+	kfree(priv);
+
+	return NULL;
+}
+
+#endif
-- 
2.27.0