mirror of https://gitee.com/openkylin/linux.git
141 lines
3.5 KiB
C
141 lines
3.5 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/msi.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/of_pci.h>
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static void its_mask_msi_irq(struct irq_data *d)
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{
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pci_msi_mask_irq(d);
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irq_chip_mask_parent(d);
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}
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static void its_unmask_msi_irq(struct irq_data *d)
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{
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pci_msi_unmask_irq(d);
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irq_chip_unmask_parent(d);
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}
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static struct irq_chip its_msi_irq_chip = {
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.name = "ITS-MSI",
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.irq_unmask = its_unmask_msi_irq,
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.irq_mask = its_mask_msi_irq,
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.irq_eoi = irq_chip_eoi_parent,
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.irq_write_msi_msg = pci_msi_domain_write_msg,
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};
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struct its_pci_alias {
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struct pci_dev *pdev;
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u32 dev_id;
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u32 count;
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};
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static int its_pci_msi_vec_count(struct pci_dev *pdev)
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{
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int msi, msix;
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msi = max(pci_msi_vec_count(pdev), 0);
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msix = max(pci_msix_vec_count(pdev), 0);
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return max(msi, msix);
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}
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static int its_get_pci_alias(struct pci_dev *pdev, u16 alias, void *data)
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{
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struct its_pci_alias *dev_alias = data;
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dev_alias->dev_id = alias;
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if (pdev != dev_alias->pdev)
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dev_alias->count += its_pci_msi_vec_count(pdev);
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return 0;
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}
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static int its_pci_msi_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 pci_dev *pdev;
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struct its_pci_alias dev_alias;
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struct msi_domain_info *msi_info;
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if (!dev_is_pci(dev))
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return -EINVAL;
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msi_info = msi_get_domain_info(domain->parent);
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pdev = to_pci_dev(dev);
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dev_alias.pdev = pdev;
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dev_alias.count = nvec;
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pci_for_each_dma_alias(pdev, its_get_pci_alias, &dev_alias);
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/* ITS specific DeviceID, as the core ITS ignores dev. */
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info->scratchpad[0].ul = dev_alias.dev_id;
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return msi_info->ops->msi_prepare(domain->parent,
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dev, dev_alias.count, info);
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}
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static struct msi_domain_ops its_pci_msi_ops = {
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.msi_prepare = its_pci_msi_prepare,
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};
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static struct msi_domain_info its_pci_msi_domain_info = {
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.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
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MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX),
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.ops = &its_pci_msi_ops,
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.chip = &its_msi_irq_chip,
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};
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static 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_pci_msi_init(void)
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{
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struct device_node *np;
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struct irq_domain *parent;
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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_property_read_bool(np, "msi-controller"))
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continue;
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parent = irq_find_matching_host(np, 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",
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np->full_name);
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continue;
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}
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if (!pci_msi_create_irq_domain(np, &its_pci_msi_domain_info,
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parent)) {
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pr_err("%s: unable to create PCI domain\n",
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np->full_name);
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continue;
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}
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pr_info("PCI/MSI: %s domain created\n", np->full_name);
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}
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return 0;
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}
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early_initcall(its_pci_msi_init);
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