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// SPDX-License-Identifier: GPL-2.0
/*
* MSI framework for platform devices
*
* Copyright (C) 2015 ARM Limited, All Rights Reserved.
* Author: Marc Zyngier <marc.zyngier@arm.com>
* Copyright (C) 2022 Linutronix GmbH
*/
#include <linux/device.h>
#include <linux/irqdomain.h>
#include <linux/msi.h>
/*
* This indirection can go when platform_device_msi_init_and_alloc_irqs()
* is switched to a proper irq_chip::irq_write_msi_msg() callback. Keep it
* simple for now.
*/
static void platform_msi_write_msi_msg(struct irq_data *d, struct msi_msg *msg)
{
irq_write_msi_msg_t cb = d->chip_data;
cb(irq_data_get_msi_desc(d), msg);
}
static void platform_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
{
arg->desc = desc;
arg->hwirq = desc->msi_index;
}
static const struct msi_domain_template platform_msi_template = {
.chip = {
.name = "pMSI",
.irq_mask = irq_chip_mask_parent,
.irq_unmask = irq_chip_unmask_parent,
.irq_write_msi_msg = platform_msi_write_msi_msg,
/* The rest is filled in by the platform MSI parent */
},
.ops = {
.set_desc = platform_msi_set_desc,
},
.info = {
.bus_token = DOMAIN_BUS_DEVICE_MSI,
},
};
/**
* platform_device_msi_init_and_alloc_irqs - Initialize platform device MSI
* and allocate interrupts for @dev
* @dev: The device for which to allocate interrupts
* @nvec: The number of interrupts to allocate
* @write_msi_msg: Callback to write an interrupt message for @dev
*
* Returns:
* Zero for success, or an error code in case of failure
*
* This creates a MSI domain on @dev which has @dev->msi.domain as
* parent. The parent domain sets up the new domain. The domain has
* a fixed size of @nvec. The domain is managed by devres and will
* be removed when the device is removed.
*
* Note: For migration purposes this falls back to the original platform_msi code
* up to the point where all platforms have been converted to the MSI
* parent model.
*/
int platform_device_msi_init_and_alloc_irqs(struct device *dev, unsigned int nvec,
irq_write_msi_msg_t write_msi_msg)
{
struct irq_domain *domain = dev->msi.domain;
if (!domain || !write_msi_msg)
return -EINVAL;
/*
* @write_msi_msg is stored in the resulting msi_domain_info::data.
* The underlying domain creation mechanism will assign that
* callback to the resulting irq chip.
*/
if (!msi_create_device_irq_domain(dev, MSI_DEFAULT_DOMAIN,
&platform_msi_template,
nvec, NULL, write_msi_msg))
return -ENODEV;
return msi_domain_alloc_irqs_range(dev, MSI_DEFAULT_DOMAIN, 0, nvec - 1);
}
EXPORT_SYMBOL_GPL(platform_device_msi_init_and_alloc_irqs);
/**
* platform_device_msi_free_irqs_all - Free all interrupts for @dev
* @dev: The device for which to free interrupts
*/
void platform_device_msi_free_irqs_all(struct device *dev)
{
msi_domain_free_irqs_all(dev, MSI_DEFAULT_DOMAIN);
}
EXPORT_SYMBOL_GPL(platform_device_msi_free_irqs_all);
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