arch/powerpc/kernel/of_platform.c

   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 <linux/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
  39 static 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
  97 static 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
 106 static 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
 115 static __init int of_pci_phb_init(void)
 116 {
 117         return platform_driver_register(&of_pci_phb_driver);
 118 }
 119
 120 device_initcall(of_pci_phb_init);
 121
 122 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */