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// SPDX-License-Identifier: GPL-2.0
/*
* Freescale Management Complex (MC) bus driver MSI support
*
* Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
* Author: German Rivera <German.Rivera@freescale.com>
*
*/
#include <linux/acpi.h>
#include <linux/acpi_iort.h>
#include <linux/irq.h>
#include <linux/msi.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/fsl/mc.h>
static struct irq_chip its_msi_irq_chip = {
.name = "ITS-fMSI",
.irq_mask = irq_chip_mask_parent,
.irq_unmask = irq_chip_unmask_parent,
.irq_eoi = irq_chip_eoi_parent,
.irq_set_affinity = msi_domain_set_affinity
};
static u32 fsl_mc_msi_domain_get_msi_id(struct irq_domain *domain,
struct fsl_mc_device *mc_dev)
{
struct device_node *of_node;
u32 out_id;
of_node = irq_domain_get_of_node(domain);
out_id = of_node ? of_msi_map_id(&mc_dev->dev, of_node, mc_dev->icid) :
iort_msi_map_id(&mc_dev->dev, mc_dev->icid);
return out_id;
}
static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
struct device *dev,
int nvec, msi_alloc_info_t *info)
{
struct fsl_mc_device *mc_bus_dev;
struct msi_domain_info *msi_info;
if (!dev_is_fsl_mc(dev))
return -EINVAL;
mc_bus_dev = to_fsl_mc_device(dev);
if (!(mc_bus_dev->flags & FSL_MC_IS_DPRC))
return -EINVAL;
/*
* Set the device Id to be passed to the GIC-ITS:
*
* NOTE: This device id corresponds to the IOMMU stream ID
* associated with the DPRC object (ICID).
*/
info->scratchpad[0].ul = fsl_mc_msi_domain_get_msi_id(msi_domain,
mc_bus_dev);
msi_info = msi_get_domain_info(msi_domain->parent);
/* Allocate at least 32 MSIs, and always as a power of 2 */
nvec = max_t(int, 32, roundup_pow_of_two(nvec));
return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);
}
static struct msi_domain_ops its_fsl_mc_msi_ops __ro_after_init = {
.msi_prepare = its_fsl_mc_msi_prepare,
};
static struct msi_domain_info its_fsl_mc_msi_domain_info = {
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
.ops = &its_fsl_mc_msi_ops,
.chip = &its_msi_irq_chip,
};
static const struct of_device_id its_device_id[] = {
{ .compatible = "arm,gic-v3-its", },
{},
};
static void __init its_fsl_mc_msi_init_one(struct fwnode_handle *handle,
const char *name)
{
struct irq_domain *parent;
struct irq_domain *mc_msi_domain;
parent = irq_find_matching_fwnode(handle, DOMAIN_BUS_NEXUS);
if (!parent || !msi_get_domain_info(parent)) {
pr_err("%s: unable to locate ITS domain\n", name);
return;
}
mc_msi_domain = fsl_mc_msi_create_irq_domain(handle,
&its_fsl_mc_msi_domain_info,
parent);
if (!mc_msi_domain) {
pr_err("%s: unable to create fsl-mc domain\n", name);
return;
}
pr_info("fsl-mc MSI: %s domain created\n", name);
}
#ifdef CONFIG_ACPI
static int __init
its_fsl_mc_msi_parse_madt(union acpi_subtable_headers *header,
const unsigned long end)
{
struct acpi_madt_generic_translator *its_entry;
struct fwnode_handle *dom_handle;
const char *node_name;
int err = 0;
its_entry = (struct acpi_madt_generic_translator *)header;
node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx",
(long)its_entry->base_address);
dom_handle = iort_find_domain_token(its_entry->translation_id);
if (!dom_handle) {
pr_err("%s: Unable to locate ITS domain handle\n", node_name);
err = -ENXIO;
goto out;
}
its_fsl_mc_msi_init_one(dom_handle, node_name);
out:
kfree(node_name);
return err;
}
static void __init its_fsl_mc_acpi_msi_init(void)
{
acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
its_fsl_mc_msi_parse_madt, 0);
}
#else
static inline void its_fsl_mc_acpi_msi_init(void) { }
#endif
static void __init its_fsl_mc_of_msi_init(void)
{
struct device_node *np;
for (np = of_find_matching_node(NULL, its_device_id); np;
np = of_find_matching_node(np, its_device_id)) {
if (!of_device_is_available(np))
continue;
if (!of_property_read_bool(np, "msi-controller"))
continue;
its_fsl_mc_msi_init_one(of_node_to_fwnode(np),
np->full_name);
}
}
static int __init its_fsl_mc_msi_init(void)
{
its_fsl_mc_of_msi_init();
its_fsl_mc_acpi_msi_init();
return 0;
}
early_initcall(its_fsl_mc_msi_init);
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