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https://github.com/torvalds/linux
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3a8f77e486
The patch moves the gen_pci_parse_request_of_pci_ranges() function from drivers/pci/host/pci-host-common.c into drivers/pci/of.c to easily share common source code between PCI host drivers. Signed-off-by: Cyrille Pitchen <cyrille.pitchen@free-electrons.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
142 lines
3.3 KiB
C
142 lines
3.3 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_irq.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 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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d = of_msi_get_domain(&bus->dev, bus->dev.of_node, DOMAIN_BUS_PCI_MSI);
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if (d)
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return d;
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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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d = irq_find_matching_host(bus->dev.of_node, DOMAIN_BUS_PCI_MSI);
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if (d)
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return d;
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return irq_find_host(bus->dev.of_node);
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#else
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return NULL;
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#endif
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}
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int pci_parse_request_of_pci_ranges(struct device *dev,
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struct list_head *resources,
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struct resource **bus_range)
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{
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int err, res_valid = 0;
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struct device_node *np = dev->of_node;
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resource_size_t iobase;
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struct resource_entry *win, *tmp;
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INIT_LIST_HEAD(resources);
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err = of_pci_get_host_bridge_resources(np, 0, 0xff, resources, &iobase);
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if (err)
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return err;
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err = devm_request_pci_bus_resources(dev, resources);
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if (err)
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goto out_release_res;
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resource_list_for_each_entry_safe(win, tmp, resources) {
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struct resource *res = win->res;
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switch (resource_type(res)) {
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case IORESOURCE_IO:
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err = pci_remap_iospace(res, iobase);
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if (err) {
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dev_warn(dev, "error %d: failed to map resource %pR\n",
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err, res);
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resource_list_destroy_entry(win);
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}
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break;
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case IORESOURCE_MEM:
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res_valid |= !(res->flags & IORESOURCE_PREFETCH);
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break;
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case IORESOURCE_BUS:
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if (bus_range)
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*bus_range = res;
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break;
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}
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}
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if (res_valid)
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return 0;
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dev_err(dev, "non-prefetchable memory resource required\n");
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err = -EINVAL;
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out_release_res:
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pci_free_resource_list(resources);
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return err;
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}
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