LXR linux/arch/powerpc/kernel/of

   1/*
   2 *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
   3 *                       <benh@kernel.crashing.org>
   4 *    and                Arnd Bergmann, IBM Corp.
   5 *
   6 *  This program is free software; you can redistribute it and/or
   7 *  modify it under the terms of the GNU General Public License
   8 *  as published by the Free Software Foundation; either version
   9 *  2 of the License, or (at your option) any later version.
  10 *
  11 */
  12
  13#undef DEBUG
  14
  15#include <linux/string.h>
  16#include <linux/kernel.h>
  17#include <linux/init.h>
  18#include <linux/export.h>
  19#include <linux/mod_devicetable.h>
  20#include <linux/pci.h>
  21#include <linux/of.h>
  22#include <linux/of_device.h>
  23#include <linux/of_platform.h>
  24#include <linux/atomic.h>
  25
  26#include <asm/errno.h>
  27#include <asm/topology.h>
  28#include <asm/pci-bridge.h>
  29#include <asm/ppc-pci.h>
  30#include <asm/eeh.h>
  31
  32#ifdef CONFIG_PPC_OF_PLATFORM_PCI
  33
  34/* The probing of PCI controllers from of_platform is currently
  35 * 64 bits only, mostly due to gratuitous differences between
  36 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
  37 * lacking some bits needed here.
  38 */
  39
  40static int of_pci_phb_probe(struct platform_device *dev)
  41{
  42        struct pci_controller *phb;
  43
  44        /* Check if we can do that ... */
  45        if (ppc_md.pci_setup_phb == NULL)
  46                return -ENODEV;
  47
  48        pr_info("Setting up PCI bus %s\n", dev->dev.of_node->full_name);
  49
  50        /* Alloc and setup PHB data structure */
  51        phb = pcibios_alloc_controller(dev->dev.of_node);
  52        if (!phb)
  53                return -ENODEV;
  54
  55        /* Setup parent in sysfs */
  56        phb->parent = &dev->dev;
  57
  58        /* Setup the PHB using arch provided callback */
  59        if (ppc_md.pci_setup_phb(phb)) {
  60                pcibios_free_controller(phb);
  61                return -ENODEV;
  62        }
  63
  64        /* Process "ranges" property */
  65        pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);
  66
  67        /* Init pci_dn data structures */
  68        pci_devs_phb_init_dynamic(phb);
  69
  70        /* Create EEH devices for the PHB */
  71        eeh_dev_phb_init_dynamic(phb);
  72
  73        /* Register devices with EEH */
  74        if (dev->dev.of_node->child)
  75                eeh_add_device_tree_early(dev->dev.of_node);
  76
  77        /* Scan the bus */
  78        pcibios_scan_phb(phb);
  79        if (phb->bus == NULL)
  80                return -ENXIO;
  81
  82        /* Claim resources. This might need some rework as well depending
  83         * whether we are doing probe-only or not, like assigning unassigned
  84         * resources etc...
  85         */
  86        pcibios_claim_one_bus(phb->bus);
  87
  88        /* Finish EEH setup */
  89        eeh_add_device_tree_late(phb->bus);
  90
  91        /* Add probed PCI devices to the device model */
  92        pci_bus_add_devices(phb->bus);
  93
  94        /* sysfs files should only be added after devices are added */
  95        eeh_add_sysfs_files(phb->bus);
  96
  97        return 0;
  98}
  99
 100static struct of_device_id of_pci_phb_ids[] = {
 101        { .type = "pci", },
 102        { .type = "pcix", },
 103        { .type = "pcie", },
 104        { .type = "pciex", },
 105        { .type = "ht", },
 106        {}
 107};
 108
 109static struct platform_driver of_pci_phb_driver = {
 110        .probe = of_pci_phb_probe,
 111        .driver = {
 112                .name = "of-pci",
 113                .owner = THIS_MODULE,
 114                .of_match_table = of_pci_phb_ids,
 115        },
 116};
 117
 118static __init int of_pci_phb_init(void)
 119{
 120        return platform_driver_register(&of_pci_phb_driver);
 121}
 122
 123device_initcall(of_pci_phb_init);
 124
 125#endif /* CONFIG_PPC_OF_PLATFORM_PCI */
 126