forked from luck/tmp_suning_uos_patched
471c931cb2
A number of platforms do not need to use the msi-parent property, as the host bridge itself provides the MSI controller. Allow this configuration by performing an irq domain lookup based on the host bridge node if it doesn't have a valid msi-parent property. Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Cc: <linux-arm-kernel@lists.infradead.org> Cc: Yijing Wang <wangyijing@huawei.com> Cc: Ma Jun <majun258@huawei.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Duc Dang <dhdang@apm.com> Cc: Hanjun Guo <hanjun.guo@linaro.org> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Jason Cooper <jason@lakedaemon.net> Link: http://lkml.kernel.org/r/1438091186-10244-7-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
/*
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* PCI <-> OF mapping helpers
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*
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* Copyright 2011 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/irqdomain.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/of.h>
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#include <linux/of_pci.h>
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#include "pci.h"
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void pci_set_of_node(struct pci_dev *dev)
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{
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if (!dev->bus->dev.of_node)
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return;
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dev->dev.of_node = of_pci_find_child_device(dev->bus->dev.of_node,
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dev->devfn);
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}
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void pci_release_of_node(struct pci_dev *dev)
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{
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of_node_put(dev->dev.of_node);
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dev->dev.of_node = NULL;
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}
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void pci_set_bus_of_node(struct pci_bus *bus)
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{
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if (bus->self == NULL)
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bus->dev.of_node = pcibios_get_phb_of_node(bus);
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else
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bus->dev.of_node = of_node_get(bus->self->dev.of_node);
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}
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void pci_release_bus_of_node(struct pci_bus *bus)
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{
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of_node_put(bus->dev.of_node);
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bus->dev.of_node = NULL;
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}
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struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus)
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{
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/* This should only be called for PHBs */
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if (WARN_ON(bus->self || bus->parent))
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return NULL;
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/* Look for a node pointer in either the intermediary device we
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* create above the root bus or it's own parent. Normally only
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* the later is populated.
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*/
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if (bus->bridge->of_node)
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return of_node_get(bus->bridge->of_node);
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if (bus->bridge->parent && bus->bridge->parent->of_node)
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return of_node_get(bus->bridge->parent->of_node);
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return NULL;
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}
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struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus)
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{
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#ifdef CONFIG_IRQ_DOMAIN
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struct device_node *np;
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struct irq_domain *d;
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if (!bus->dev.of_node)
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return NULL;
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/* Start looking for a phandle to an MSI controller. */
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np = of_parse_phandle(bus->dev.of_node, "msi-parent", 0);
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/*
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* If we don't have an msi-parent property, look for a domain
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* directly attached to the host bridge.
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*/
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if (!np)
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np = bus->dev.of_node;
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d = irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI);
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if (d)
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return d;
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return irq_find_host(np);
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#else
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return NULL;
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#endif
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}
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