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163 lines
3.8 KiB
163 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2013-2015 ARM Limited, All Rights Reserved. |
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* Author: Marc Zyngier <[email protected]> |
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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(union acpi_subtable_headers *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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