drivers/soc/ti/ti_sci_inta_msi.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Texas Instruments' K3 Interrupt Aggregator MSI bus
 *
 * Copyright (C) 2018-2019 Texas Instruments Incorporated - http://www.ti.com/
 *	Lokesh Vutla <lokeshvutla@ti.com>
 */

#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/msi.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/soc/ti/ti_sci_inta_msi.h>
#include <linux/soc/ti/ti_sci_protocol.h>

static void ti_sci_inta_msi_write_msg(struct irq_data *data,
				      struct msi_msg *msg)
{
	/* Nothing to do */
}

static void ti_sci_inta_msi_compose_msi_msg(struct irq_data *data,
					    struct msi_msg *msg)
{
	/* Nothing to do */
}

static void ti_sci_inta_msi_update_chip_ops(struct msi_domain_info *info)
{
	struct irq_chip *chip = info->chip;

	if (WARN_ON(!chip))
		return;

	chip->irq_request_resources = irq_chip_request_resources_parent;
	chip->irq_release_resources = irq_chip_release_resources_parent;
	chip->irq_compose_msi_msg = ti_sci_inta_msi_compose_msi_msg;
	chip->irq_write_msi_msg = ti_sci_inta_msi_write_msg;
	chip->irq_set_type = irq_chip_set_type_parent;
	chip->irq_unmask = irq_chip_unmask_parent;
	chip->irq_mask = irq_chip_mask_parent;
	chip->irq_ack = irq_chip_ack_parent;
}

struct irq_domain *ti_sci_inta_msi_create_irq_domain(struct fwnode_handle *fwnode,
						     struct msi_domain_info *info,
						     struct irq_domain *parent)
{
	struct irq_domain *domain;

	ti_sci_inta_msi_update_chip_ops(info);
	info->flags |= MSI_FLAG_FREE_MSI_DESCS;

	domain = msi_create_irq_domain(fwnode, info, parent);
	if (domain)
		irq_domain_update_bus_token(domain, DOMAIN_BUS_TI_SCI_INTA_MSI);

	return domain;
}
EXPORT_SYMBOL_GPL(ti_sci_inta_msi_create_irq_domain);

static int ti_sci_inta_msi_alloc_descs(struct device *dev,
				       struct ti_sci_resource *res)
{
	struct msi_desc msi_desc;
	int set, i, count = 0;

	memset(&msi_desc, 0, sizeof(msi_desc));
	msi_desc.nvec_used = 1;

	for (set = 0; set < res->sets; set++) {
		for (i = 0; i < res->desc[set].num; i++, count++) {
			msi_desc.msi_index = res->desc[set].start + i;
			if (msi_insert_msi_desc(dev, &msi_desc))
				goto fail;
		}

		for (i = 0; i < res->desc[set].num_sec; i++, count++) {
			msi_desc.msi_index = res->desc[set].start_sec + i;
			if (msi_insert_msi_desc(dev, &msi_desc))
				goto fail;
		}
	}
	return count;
fail:
	msi_free_msi_descs(dev);
	return -ENOMEM;
}

int ti_sci_inta_msi_domain_alloc_irqs(struct device *dev,
				      struct ti_sci_resource *res)
{
	struct platform_device *pdev = to_platform_device(dev);
	int ret, nvec;

	if (pdev->id < 0)
		return -ENODEV;

	ret = msi_setup_device_data(dev);
	if (ret)
		return ret;

	msi_lock_descs(dev);
	nvec = ti_sci_inta_msi_alloc_descs(dev, res);
	if (nvec <= 0) {
		ret = nvec;
		goto unlock;
	}

	/* Use alloc ALL as it's unclear whether there are gaps in the indices */
	ret = msi_domain_alloc_irqs_all_locked(dev, MSI_DEFAULT_DOMAIN, nvec);
	if (ret)
		dev_err(dev, "Failed to allocate IRQs %d\n", ret);
unlock:
	msi_unlock_descs(dev);
	return ret;
}
EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_alloc_irqs);