LXR linux/arch/powerpc/kernel/of

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
   4 *                       <benh@kernel.crashing.org>
   5 *    and                Arnd Bergmann, IBM Corp.
   6 */
   7
   8#undef DEBUG
   9
  10#include <linux/string.h>
  11#include <linux/kernel.h>
  12#include <linux/init.h>
  13#include <linux/export.h>
  14#include <linux/mod_devicetable.h>
  15#include <linux/pci.h>
  16#include <linux/of.h>
  17#include <linux/of_device.h>
  18#include <linux/of_platform.h>
  19#include <linux/atomic.h>
  20
  21#include <asm/errno.h>
  22#include <asm/topology.h>
  23#include <asm/pci-bridge.h>
  24#include <asm/ppc-pci.h>
  25#include <asm/eeh.h>
  26
  27#ifdef CONFIG_PPC_OF_PLATFORM_PCI
  28
  29/* The probing of PCI controllers from of_platform is currently
  30 * 64 bits only, mostly due to gratuitous differences between
  31 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
  32 * lacking some bits needed here.
  33 */
  34
  35static int of_pci_phb_probe(struct platform_device *dev)
  36{
  37        struct pci_controller *phb;
  38
  39        /* Check if we can do that ... */
  40        if (ppc_md.pci_setup_phb == NULL)
  41                return -ENODEV;
  42
  43        pr_info("Setting up PCI bus %pOF\n", dev->dev.of_node);
  44
  45        /* Alloc and setup PHB data structure */
  46        phb = pcibios_alloc_controller(dev->dev.of_node);
  47        if (!phb)
  48                return -ENODEV;
  49
  50        /* Setup parent in sysfs */
  51        phb->parent = &dev->dev;
  52
  53        /* Setup the PHB using arch provided callback */
  54        if (ppc_md.pci_setup_phb(phb)) {
  55                pcibios_free_controller(phb);
  56                return -ENODEV;
  57        }
  58
  59        /* Process "ranges" property */
  60        pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);
  61
  62        /* Init pci_dn data structures */
  63        pci_devs_phb_init_dynamic(phb);
  64
  65        /* Create EEH devices for the PHB */
  66        eeh_dev_phb_init_dynamic(phb);
  67
  68        /* Register devices with EEH */
  69        if (dev->dev.of_node->child)
  70                eeh_add_device_tree_early(PCI_DN(dev->dev.of_node));
  71
  72        /* Scan the bus */
  73        pcibios_scan_phb(phb);
  74        if (phb->bus == NULL)
  75                return -ENXIO;
  76
  77        /* Claim resources. This might need some rework as well depending
  78         * whether we are doing probe-only or not, like assigning unassigned
  79         * resources etc...
  80         */
  81        pcibios_claim_one_bus(phb->bus);
  82
  83        /* Finish EEH setup */
  84        eeh_add_device_tree_late(phb->bus);
  85
  86        /* Add probed PCI devices to the device model */
  87        pci_bus_add_devices(phb->bus);
  88
  89        /* sysfs files should only be added after devices are added */
  90        eeh_add_sysfs_files(phb->bus);
  91
  92        return 0;
  93}
  94
  95static const struct of_device_id of_pci_phb_ids[] = {
  96        { .type = "pci", },
  97        { .type = "pcix", },
  98        { .type = "pcie", },
  99        { .type = "pciex", },
 100        { .type = "ht", },
 101        {}
 102};
 103
 104static struct platform_driver of_pci_phb_driver = {
 105        .probe = of_pci_phb_probe,
 106        .driver = {
 107                .name = "of-pci",
 108                .of_match_table = of_pci_phb_ids,
 109        },
 110};
 111
 112builtin_platform_driver(of_pci_phb_driver);
 113
 114#endif /* CONFIG_PPC_OF_PLATFORM_PCI */
 115