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/module.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
  25#include <asm/errno.h>
  26#include <asm/topology.h>
  27#include <asm/pci-bridge.h>
  28#include <asm/ppc-pci.h>
  29#include <asm/atomic.h>
  30
  31#ifdef CONFIG_PPC_OF_PLATFORM_PCI
  32
  33/* The probing of PCI controllers from of_platform is currently
  34 * 64 bits only, mostly due to gratuitous differences between
  35 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
  36 * lacking some bits needed here.
  37 */
  38
  39static int __devinit of_pci_phb_probe(struct platform_device *dev)
  40{
  41        struct pci_controller *phb;
  42
  43        /* Check if we can do that ... */
  44        if (ppc_md.pci_setup_phb == NULL)
  45                return -ENODEV;
  46
  47        pr_info("Setting up PCI bus %s\n", dev->dev.of_node->full_name);
  48
  49        /* Alloc and setup PHB data structure */
  50        phb = pcibios_alloc_controller(dev->dev.of_node);
  51        if (!phb)
  52                return -ENODEV;
  53
  54        /* Setup parent in sysfs */
  55        phb->parent = &dev->dev;
  56
  57        /* Setup the PHB using arch provided callback */
  58        if (ppc_md.pci_setup_phb(phb)) {
  59                pcibios_free_controller(phb);
  60                return -ENODEV;
  61        }
  62
  63        /* Process "ranges" property */
  64        pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);
  65
  66        /* Init pci_dn data structures */
  67        pci_devs_phb_init_dynamic(phb);
  68
  69        /* Register devices with EEH */
  70#ifdef CONFIG_EEH
  71        if (dev->dev.of_node->child)
  72                eeh_add_device_tree_early(dev->dev.of_node);
  73#endif /* CONFIG_EEH */
  74
  75        /* Scan the bus */
  76        pcibios_scan_phb(phb);
  77        if (phb->bus == NULL)
  78                return -ENXIO;
  79
  80        /* Claim resources. This might need some rework as well depending
  81         * wether we are doing probe-only or not, like assigning unassigned
  82         * resources etc...
  83         */
  84        pcibios_claim_one_bus(phb->bus);
  85
  86        /* Finish EEH setup */
  87#ifdef CONFIG_EEH
  88        eeh_add_device_tree_late(phb->bus);
  89#endif
  90
  91        /* Add probed PCI devices to the device model */
  92        pci_bus_add_devices(phb->bus);
  93
  94        return 0;
  95}
  96
  97static struct of_device_id of_pci_phb_ids[] = {
  98        { .type = "pci", },
  99        { .type = "pcix", },
 100        { .type = "pcie", },
 101        { .type = "pciex", },
 102        { .type = "ht", },
 103        {}
 104};
 105
 106static struct platform_driver of_pci_phb_driver = {
 107        .probe = of_pci_phb_probe,
 108        .driver = {
 109                .name = "of-pci",
 110                .owner = THIS_MODULE,
 111                .of_match_table = of_pci_phb_ids,
 112        },
 113};
 114
 115static __init int of_pci_phb_init(void)
 116{
 117        return platform_driver_register(&of_pci_phb_driver);
 118}
 119
 120device_initcall(of_pci_phb_init);
 121
 122#endif /* CONFIG_PPC_OF_PLATFORM_PCI */
 123