175 lines
4.3 KiB
C
175 lines
4.3 KiB
C
/*
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* Copyright (C) 2013-2015 ARM Limited, All Rights Reserved.
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/acpi_iort.h>
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#include <linux/device.h>
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#include <linux/msi.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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static struct irq_chip its_pmsi_irq_chip = {
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.name = "ITS-pMSI",
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};
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static int of_pmsi_get_dev_id(struct irq_domain *domain, struct device *dev,
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u32 *dev_id)
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{
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int ret, index = 0;
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/* Suck the DeviceID out of the msi-parent property */
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do {
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struct of_phandle_args args;
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ret = of_parse_phandle_with_args(dev->of_node,
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"msi-parent", "#msi-cells",
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index, &args);
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if (args.np == irq_domain_get_of_node(domain)) {
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if (WARN_ON(args.args_count != 1))
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return -EINVAL;
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*dev_id = args.args[0];
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break;
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}
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index++;
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} while (!ret);
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return ret;
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}
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int __weak iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
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{
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return -1;
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}
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static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
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int nvec, msi_alloc_info_t *info)
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{
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struct msi_domain_info *msi_info;
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u32 dev_id;
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int ret;
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msi_info = msi_get_domain_info(domain->parent);
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if (dev->of_node)
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ret = of_pmsi_get_dev_id(domain, dev, &dev_id);
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else
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ret = iort_pmsi_get_dev_id(dev, &dev_id);
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if (ret)
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return ret;
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/* ITS specific DeviceID, as the core ITS ignores dev. */
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info->scratchpad[0].ul = dev_id;
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/* Allocate at least 32 MSIs, and always as a power of 2 */
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nvec = max_t(int, 32, roundup_pow_of_two(nvec));
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return msi_info->ops->msi_prepare(domain->parent,
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dev, nvec, info);
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}
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static struct msi_domain_ops its_pmsi_ops = {
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.msi_prepare = its_pmsi_prepare,
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};
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static struct msi_domain_info its_pmsi_domain_info = {
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.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
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.ops = &its_pmsi_ops,
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.chip = &its_pmsi_irq_chip,
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};
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static const struct of_device_id its_device_id[] = {
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{ .compatible = "arm,gic-v3-its", },
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{},
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};
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static int __init its_pmsi_init_one(struct fwnode_handle *fwnode,
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const char *name)
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{
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struct irq_domain *parent;
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parent = irq_find_matching_fwnode(fwnode, DOMAIN_BUS_NEXUS);
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if (!parent || !msi_get_domain_info(parent)) {
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pr_err("%s: unable to locate ITS domain\n", name);
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return -ENXIO;
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}
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if (!platform_msi_create_irq_domain(fwnode, &its_pmsi_domain_info,
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parent)) {
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pr_err("%s: unable to create platform domain\n", name);
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return -ENXIO;
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}
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pr_info("Platform MSI: %s domain created\n", name);
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return 0;
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}
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#ifdef CONFIG_ACPI
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static int __init
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its_pmsi_parse_madt(struct acpi_subtable_header *header,
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const unsigned long end)
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{
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struct acpi_madt_generic_translator *its_entry;
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struct fwnode_handle *domain_handle;
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const char *node_name;
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int err = -ENXIO;
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its_entry = (struct acpi_madt_generic_translator *)header;
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node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx",
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(long)its_entry->base_address);
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domain_handle = iort_find_domain_token(its_entry->translation_id);
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if (!domain_handle) {
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pr_err("%s: Unable to locate ITS domain handle\n", node_name);
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goto out;
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}
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err = its_pmsi_init_one(domain_handle, node_name);
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out:
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kfree(node_name);
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return err;
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}
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static void __init its_pmsi_acpi_init(void)
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{
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acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
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its_pmsi_parse_madt, 0);
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}
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#else
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static inline void its_pmsi_acpi_init(void) { }
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#endif
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static void __init its_pmsi_of_init(void)
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{
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struct device_node *np;
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for (np = of_find_matching_node(NULL, its_device_id); np;
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np = of_find_matching_node(np, its_device_id)) {
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if (!of_device_is_available(np))
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continue;
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if (!of_property_read_bool(np, "msi-controller"))
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continue;
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its_pmsi_init_one(of_node_to_fwnode(np), np->full_name);
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}
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}
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static int __init its_pmsi_init(void)
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{
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its_pmsi_of_init();
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its_pmsi_acpi_init();
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return 0;
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}
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early_initcall(its_pmsi_init);
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