[RFC PATCH v2 16/17] irqchip/riscv-rpmi-sysmsi: Add ACPI support

[Anup Patel <apatel@xxxxxxxxxxxxxxxx>]

From: Sunil V L <sunilvl@xxxxxxxxxxxxxxxx>

Add ACPI support for the RISC-V RPMI system MSI based irqchip driver.

Signed-off-by: Sunil V L <sunilvl@xxxxxxxxxxxxxxxx>
Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
---
 drivers/irqchip/Kconfig                 |  2 +-
 drivers/irqchip/irq-riscv-rpmi-sysmsi.c | 34 ++++++++++++++++++++++++-
 2 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 2ae44354735b..cf96382113ce 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -599,7 +599,7 @@ config RISCV_IMSIC_PCI
 
 config RISCV_RPMI_SYSMSI
 	bool
-	depends on MAILBOX
+	depends on RISCV && MAILBOX
 	select IRQ_DOMAIN_HIERARCHY
 	select GENERIC_MSI_IRQ
 	default RISCV
diff --git a/drivers/irqchip/irq-riscv-rpmi-sysmsi.c b/drivers/irqchip/irq-riscv-rpmi-sysmsi.c
index 3022f0924c94..1f03241920bb 100644
--- a/drivers/irqchip/irq-riscv-rpmi-sysmsi.c
+++ b/drivers/irqchip/irq-riscv-rpmi-sysmsi.c
@@ -8,6 +8,7 @@
 #include <linux/cpu.h>
 #include <linux/interrupt.h>
 #include <linux/irqchip.h>
+#include <linux/irqchip/riscv-imsic.h>
 #include <linux/mailbox_client.h>
 #include <linux/mailbox/riscv-rpmi-message.h>
 #include <linux/module.h>
@@ -215,6 +216,7 @@ static int rpmi_sysmsi_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct rpmi_sysmsi_priv *priv;
+	u32 id;
 	int rc;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -223,6 +225,15 @@ static int rpmi_sysmsi_probe(struct platform_device *pdev)
 	priv->dev = dev;
 	platform_set_drvdata(pdev, priv);
 
+	if (!is_of_node(dev->fwnode)) {
+		rc = riscv_acpi_get_gsi_info(dev->fwnode, &priv->gsi_base, &id,
+					     &priv->nr_irqs, NULL);
+		if (rc) {
+			dev_err(dev, "failed to find GSI mapping\n");
+			return rc;
+		}
+	}
+
 	/* Setup mailbox client */
 	priv->client.dev		= priv->dev;
 	priv->client.rx_callback	= NULL;
@@ -252,8 +263,16 @@ static int rpmi_sysmsi_probe(struct platform_device *pdev)
 		 * then we need to set it explicitly before using any platform
 		 * MSI functions.
 		 */
-		if (is_of_node(dev->fwnode))
+		if (is_of_node(dev->fwnode)) {
 			of_msi_configure(dev, to_of_node(dev->fwnode));
+		} else {
+			struct irq_domain *msi_domain;
+
+			msi_domain = irq_find_matching_fwnode(imsic_acpi_get_fwnode(dev),
+							      DOMAIN_BUS_PLATFORM_MSI);
+			if (msi_domain)
+				dev_set_msi_domain(dev, msi_domain);
+		}
 
 		if (!dev_get_msi_domain(dev))
 			return -EPROBE_DEFER;
@@ -264,6 +283,10 @@ static int rpmi_sysmsi_probe(struct platform_device *pdev)
 					  priv->nr_irqs, priv, priv))
 		return dev_err_probe(dev, -ENOMEM, "failed to create MSI irq domain\n");
 
+#ifdef CONFIG_ACPI
+	if (!acpi_disabled)
+		acpi_dev_clear_dependencies(ACPI_COMPANION(dev));
+#endif
 	dev_info(dev, "%d system MSIs registered\n", priv->nr_irqs);
 	return 0;
 }
@@ -273,10 +296,19 @@ static const struct of_device_id rpmi_sysmsi_match[] = {
 	{}
 };
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id acpi_rpmi_sysmsi_match[] = {
+	{ "RSCV0006", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, acpi_rpmi_sysmsi_match);
+#endif
+
 static struct platform_driver rpmi_sysmsi_driver = {
 	.driver = {
 		.name		= "rpmi-sysmsi",
 		.of_match_table	= rpmi_sysmsi_match,
+		.acpi_match_table	= ACPI_PTR(acpi_rpmi_sysmsi_match),
 	},
 	.probe = rpmi_sysmsi_probe,
 };
-- 
2.43.0