| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013-2015 ARM Limited, All Rights Reserved. |
| 3 | * Author: Marc Zyngier <marc.zyngier@arm.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/device.h> |
| 19 | #include <linux/msi.h> |
| 20 | #include <linux/of.h> |
| 21 | #include <linux/of_irq.h> |
| 22 | |
| 23 | static struct irq_chip its_pmsi_irq_chip = { |
| 24 | .name = "ITS-pMSI", |
| 25 | }; |
| 26 | |
| 27 | static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev, |
| 28 | int nvec, msi_alloc_info_t *info) |
| 29 | { |
| 30 | struct msi_domain_info *msi_info; |
| 31 | u32 dev_id; |
| 32 | int ret, index = 0; |
| 33 | |
| 34 | msi_info = msi_get_domain_info(domain->parent); |
| 35 | |
| 36 | /* Suck the DeviceID out of the msi-parent property */ |
| 37 | do { |
| 38 | struct of_phandle_args args; |
| 39 | |
| 40 | ret = of_parse_phandle_with_args(dev->of_node, |
| 41 | "msi-parent", "#msi-cells", |
| 42 | index, &args); |
| 43 | if (args.np == irq_domain_get_of_node(domain)) { |
| 44 | if (WARN_ON(args.args_count != 1)) |
| 45 | return -EINVAL; |
| 46 | dev_id = args.args[0]; |
| 47 | break; |
| 48 | } |
| 49 | } while (!ret); |
| 50 | |
| 51 | if (ret) |
| 52 | return ret; |
| 53 | |
| 54 | /* ITS specific DeviceID, as the core ITS ignores dev. */ |
| 55 | info->scratchpad[0].ul = dev_id; |
| 56 | |
| 57 | return msi_info->ops->msi_prepare(domain->parent, |
| 58 | dev, nvec, info); |
| 59 | } |
| 60 | |
| 61 | static struct msi_domain_ops its_pmsi_ops = { |
| 62 | .msi_prepare = its_pmsi_prepare, |
| 63 | }; |
| 64 | |
| 65 | static struct msi_domain_info its_pmsi_domain_info = { |
| 66 | .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), |
| 67 | .ops = &its_pmsi_ops, |
| 68 | .chip = &its_pmsi_irq_chip, |
| 69 | }; |
| 70 | |
| 71 | static struct of_device_id its_device_id[] = { |
| 72 | { .compatible = "arm,gic-v3-its", }, |
| 73 | {}, |
| 74 | }; |
| 75 | |
| 76 | static int __init its_pmsi_init(void) |
| 77 | { |
| 78 | struct device_node *np; |
| 79 | struct irq_domain *parent; |
| 80 | |
| 81 | for (np = of_find_matching_node(NULL, its_device_id); np; |
| 82 | np = of_find_matching_node(np, its_device_id)) { |
| 83 | if (!of_property_read_bool(np, "msi-controller")) |
| 84 | continue; |
| 85 | |
| 86 | parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS); |
| 87 | if (!parent || !msi_get_domain_info(parent)) { |
| 88 | pr_err("%s: unable to locate ITS domain\n", |
| 89 | np->full_name); |
| 90 | continue; |
| 91 | } |
| 92 | |
| 93 | if (!platform_msi_create_irq_domain(of_node_to_fwnode(np), |
| 94 | &its_pmsi_domain_info, |
| 95 | parent)) { |
| 96 | pr_err("%s: unable to create platform domain\n", |
| 97 | np->full_name); |
| 98 | continue; |
| 99 | } |
| 100 | |
| 101 | pr_info("Platform MSI: %s domain created\n", np->full_name); |
| 102 | } |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | early_initcall(its_pmsi_init); |