Commit 4752b0cf authored by Sunil V L's avatar Sunil V L Committed by Paul Walmsley
Browse files

irqchip/riscv-rpmi-sysmsi: Add ACPI support 



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

Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarSunil V L <sunilvl@ventanamicro.com>
Signed-off-by: default avatarAnup Patel <apatel@ventanamicro.com>
Acked-by: default avatarJassi Brar <jassisinghbrar@gmail.com>
Link: https://lore.kernel.org/r/20250818040920.272664-23-apatel@ventanamicro.com


Signed-off-by: default avatarPaul Walmsley <pjw@kernel.org>
parent 7e64042f

drivers/irqchip/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -636,7 +636,7 @@ config RISCV_IMSIC 


config RISCV_RPMI_SYSMSI

	bool

	depends on MAILBOX

	depends on RISCV && MAILBOX

	select IRQ_DOMAIN_HIERARCHY

	select GENERIC_MSI_IRQ

	default RISCV

drivers/irqchip/irq-riscv-rpmi-sysmsi.c

+44 −3
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright (C) 2025 Ventana Micro Systems Inc. */



#include <linux/acpi.h>

#include <linux/bits.h>

#include <linux/bug.h>

#include <linux/device.h>
@@ -9,6 +10,7 @@ 
#include <linux/errno.h>

#include <linux/irq.h>

#include <linux/irqdomain.h>

#include <linux/irqchip/riscv-imsic.h>

#include <linux/mailbox_client.h>

#include <linux/mailbox/riscv-rpmi-message.h>

#include <linux/module.h>
@@ -209,6 +211,8 @@ static int rpmi_sysmsi_probe(struct platform_device *pdev) 
{

	struct device *dev = &pdev->dev;

	struct rpmi_sysmsi_priv *priv;

	struct fwnode_handle *fwnode;

	u32 id;

	int rc;



	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -239,6 +243,22 @@ static int rpmi_sysmsi_probe(struct platform_device *pdev) 
	}

	priv->nr_irqs = rc;



	fwnode = dev_fwnode(dev);

	if (is_acpi_node(fwnode)) {

		u32 nr_irqs;



		rc = riscv_acpi_get_gsi_info(fwnode, &priv->gsi_base, &id,

					     &nr_irqs, NULL);

		if (rc) {

			dev_err(dev, "failed to find GSI mapping\n");

			return rc;

		}



		/* Update with actual GSI range */

		if (nr_irqs != priv->nr_irqs)

			riscv_acpi_update_gsi_range(priv->gsi_base, priv->nr_irqs);

	}



	/*

	 * The device MSI domain for platform devices on RISC-V architecture

	 * is only available after the MSI controller driver is probed so,
@@ -252,8 +272,15 @@ static int rpmi_sysmsi_probe(struct platform_device *pdev) 
		 * then we need to set it explicitly before using any platform

		 * MSI functions.

		 */

		if (dev_of_node(dev))

		if (is_of_node(fwnode)) {

			of_msi_configure(dev, dev_of_node(dev));

		} else if (is_acpi_device_node(fwnode)) {

			struct irq_domain *msi_domain;



			msi_domain = irq_find_matching_fwnode(imsic_acpi_get_fwnode(dev),

							      DOMAIN_BUS_PLATFORM_MSI);

			dev_set_msi_domain(dev, msi_domain);

		}



		if (!dev_get_msi_domain(dev)) {

			mbox_free_channel(priv->chan);
@@ -268,6 +295,13 @@ static int rpmi_sysmsi_probe(struct platform_device *pdev) 
		return dev_err_probe(dev, -ENOMEM, "failed to create MSI irq domain\n");

	}



#ifdef CONFIG_ACPI

	struct acpi_device *adev = ACPI_COMPANION(dev);



	if (adev)

		acpi_dev_clear_dependencies(adev);

#endif



	dev_info(dev, "%u system MSIs registered\n", priv->nr_irqs);

	return 0;

}
@@ -277,10 +311,17 @@ static const struct of_device_id rpmi_sysmsi_match[] = { 
	{}

};



static const struct acpi_device_id acpi_rpmi_sysmsi_match[] = {

	{ "RSCV0006" },

	{}

};

MODULE_DEVICE_TABLE(acpi, acpi_rpmi_sysmsi_match);



static struct platform_driver rpmi_sysmsi_driver = {

	.driver = {

		.name			= "rpmi-sysmsi",

		.of_match_table		= rpmi_sysmsi_match,

		.acpi_match_table	= acpi_rpmi_sysmsi_match,

	},

	.probe = rpmi_sysmsi_probe,

};