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From:   Sunil V L <sunilvl@ventanamicro.com>
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        Conor Dooley <conor.dooley@microchip.com>,
        Atish Kumar Patra <atishp@rivosinc.com>,
        Sunil V L <sunilvl@ventanamicro.com>
Subject: [RFC PATCH v1 18/21] irqchip/irq-riscv-aplic-msi: Add ACPI support
Date:   Thu,  3 Aug 2023 23:29:13 +0530
Message-Id: <20230803175916.3174453-19-sunilvl@ventanamicro.com>
In-Reply-To: <20230803175916.3174453-1-sunilvl@ventanamicro.com>
References: <20230803175916.3174453-1-sunilvl@ventanamicro.com>
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Search and configure the MSI domain for the APLIC
on ACPI based systems.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
---
 drivers/irqchip/irq-riscv-aplic-msi.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-riscv-aplic-msi.c b/drivers/irqchip/irq-riscv-aplic-msi.c
index 086d00e0429e..1948444c9e0c 100644
--- a/drivers/irqchip/irq-riscv-aplic-msi.c
+++ b/drivers/irqchip/irq-riscv-aplic-msi.c
@@ -16,6 +16,7 @@
 #include <linux/platform_device.h>
 #include <linux/printk.h>
 #include <linux/smp.h>
+#include <asm/acpi.h>
 
 #include "irq-riscv-aplic-main.h"
 
@@ -178,6 +179,8 @@ static void aplic_msi_write_msg(struct msi_desc *desc, struct msi_msg *msg)
 int aplic_msi_setup(struct device *dev, void __iomem *regs)
 {
 	const struct imsic_global_config *imsic_global;
+	struct irq_domain *msi_domain = NULL;
+	struct fwnode_handle *msi_fwnode;
 	struct irq_domain *irqdomain;
 	struct aplic_priv *priv;
 	struct aplic_msicfg *mc;
@@ -261,8 +264,17 @@ int aplic_msi_setup(struct device *dev, void __iomem *regs)
 		 * IMSIC and the IMSIC MSI domains are created later through
 		 * the platform driver probing so we set it explicitly here.
 		 */
-		if (is_of_node(dev->fwnode))
+		if (is_of_node(dev->fwnode)) {
 			of_msi_configure(dev, to_of_node(dev->fwnode));
+		} else {
+			msi_fwnode = acpi_riscv_get_msi_fwnode(dev);
+			if (msi_fwnode)
+				msi_domain = irq_find_matching_fwnode(msi_fwnode,
+								      DOMAIN_BUS_PLATFORM_MSI);
+
+			if (msi_domain)
+				dev_set_msi_domain(dev, msi_domain);
+		}
 	}
 
 	/* Create irq domain instance for the APLIC MSI-mode */
-- 
2.39.2