linux/drivers/bus/fsl-mc/fsl-mc-msi.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Freescale Management Complex (MC) bus driver MSI support
 *
 * Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
 * Author: German Rivera <[email protected]>
 *
 */

#include <linux/of_irq.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/msi.h>
#include <linux/acpi_iort.h>

#include "fsl-mc-private.h"

#ifdef GENERIC_MSI_DOMAIN_OPS
/*
 * Generate a unique ID identifying the interrupt (only used within the MSI
 * irqdomain.  Combine the icid with the interrupt index.
 */
static irq_hw_number_t fsl_mc_domain_calc_hwirq(struct fsl_mc_device *dev,
						struct msi_desc *desc)
{
	/*
	 * Make the base hwirq value for ICID*10000 so it is readable
	 * as a decimal value in /proc/interrupts.
	 */
	return (irq_hw_number_t)(desc->msi_index + (dev->icid * 10000));
}

static void fsl_mc_msi_set_desc(msi_alloc_info_t *arg,
				struct msi_desc *desc)
{
	arg->desc = desc;
	arg->hwirq = fsl_mc_domain_calc_hwirq(to_fsl_mc_device(desc->dev),
					      desc);
}
#else
#define fsl_mc_msi_set_desc …
#endif

static void fsl_mc_msi_update_dom_ops(struct msi_domain_info *info)
{ … }

static void __fsl_mc_msi_write_msg(struct fsl_mc_device *mc_bus_dev,
				   struct fsl_mc_device_irq *mc_dev_irq,
				   struct msi_desc *msi_desc)
{ … }

/*
 * NOTE: This function is invoked with interrupts disabled
 */
static void fsl_mc_msi_write_msg(struct irq_data *irq_data,
				 struct msi_msg *msg)
{ … }

static void fsl_mc_msi_update_chip_ops(struct msi_domain_info *info)
{ … }

/**
 * fsl_mc_msi_create_irq_domain - Create a fsl-mc MSI interrupt domain
 * @fwnode:	Optional firmware node of the interrupt controller
 * @info:	MSI domain info
 * @parent:	Parent irq domain
 *
 * Updates the domain and chip ops and creates a fsl-mc MSI
 * interrupt domain.
 *
 * Returns:
 * A domain pointer or NULL in case of failure.
 */
struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
						struct msi_domain_info *info,
						struct irq_domain *parent)
{ … }

struct irq_domain *fsl_mc_find_msi_domain(struct device *dev)
{ … }

int fsl_mc_msi_domain_alloc_irqs(struct device *dev,  unsigned int irq_count)
{ … }

void fsl_mc_msi_domain_free_irqs(struct device *dev)
{ … }