linux-stable/drivers/irqchip/irq-gic-v3-its-platform-msi.c
Thomas Gleixner caab277b1d treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation this program is
  distributed in the hope that it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program if not see http www gnu org
  licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 503 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Enrico Weigelt <info@metux.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:07 +02:00

163 lines
3.8 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013-2015 ARM Limited, All Rights Reserved.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*/
#include <linux/acpi_iort.h>
#include <linux/device.h>
#include <linux/msi.h>
#include <linux/of.h>
#include <linux/of_irq.h>
static struct irq_chip its_pmsi_irq_chip = {
.name = "ITS-pMSI",
};
static int of_pmsi_get_dev_id(struct irq_domain *domain, struct device *dev,
u32 *dev_id)
{
int ret, index = 0;
/* Suck the DeviceID out of the msi-parent property */
do {
struct of_phandle_args args;
ret = of_parse_phandle_with_args(dev->of_node,
"msi-parent", "#msi-cells",
index, &args);
if (args.np == irq_domain_get_of_node(domain)) {
if (WARN_ON(args.args_count != 1))
return -EINVAL;
*dev_id = args.args[0];
break;
}
index++;
} while (!ret);
return ret;
}
int __weak iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
{
return -1;
}
static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
int nvec, msi_alloc_info_t *info)
{
struct msi_domain_info *msi_info;
u32 dev_id;
int ret;
msi_info = msi_get_domain_info(domain->parent);
if (dev->of_node)
ret = of_pmsi_get_dev_id(domain, dev, &dev_id);
else
ret = iort_pmsi_get_dev_id(dev, &dev_id);
if (ret)
return ret;
/* ITS specific DeviceID, as the core ITS ignores dev. */
info->scratchpad[0].ul = dev_id;
/* 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(domain->parent,
dev, nvec, info);
}
static struct msi_domain_ops its_pmsi_ops = {
.msi_prepare = its_pmsi_prepare,
};
static struct msi_domain_info its_pmsi_domain_info = {
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
.ops = &its_pmsi_ops,
.chip = &its_pmsi_irq_chip,
};
static const struct of_device_id its_device_id[] = {
{ .compatible = "arm,gic-v3-its", },
{},
};
static int __init its_pmsi_init_one(struct fwnode_handle *fwnode,
const char *name)
{
struct irq_domain *parent;
parent = irq_find_matching_fwnode(fwnode, DOMAIN_BUS_NEXUS);
if (!parent || !msi_get_domain_info(parent)) {
pr_err("%s: unable to locate ITS domain\n", name);
return -ENXIO;
}
if (!platform_msi_create_irq_domain(fwnode, &its_pmsi_domain_info,
parent)) {
pr_err("%s: unable to create platform domain\n", name);
return -ENXIO;
}
pr_info("Platform MSI: %s domain created\n", name);
return 0;
}
#ifdef CONFIG_ACPI
static int __init
its_pmsi_parse_madt(union acpi_subtable_headers *header,
const unsigned long end)
{
struct acpi_madt_generic_translator *its_entry;
struct fwnode_handle *domain_handle;
const char *node_name;
int err = -ENXIO;
its_entry = (struct acpi_madt_generic_translator *)header;
node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx",
(long)its_entry->base_address);
domain_handle = iort_find_domain_token(its_entry->translation_id);
if (!domain_handle) {
pr_err("%s: Unable to locate ITS domain handle\n", node_name);
goto out;
}
err = its_pmsi_init_one(domain_handle, node_name);
out:
kfree(node_name);
return err;
}
static void __init its_pmsi_acpi_init(void)
{
acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
its_pmsi_parse_madt, 0);
}
#else
static inline void its_pmsi_acpi_init(void) { }
#endif
static void __init its_pmsi_of_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_pmsi_init_one(of_node_to_fwnode(np), np->full_name);
}
}
static int __init its_pmsi_init(void)
{
its_pmsi_of_init();
its_pmsi_acpi_init();
return 0;
}
early_initcall(its_pmsi_init);