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 <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
  39 static int __devinit of_pci_phb_probe(struct platform_device *dev,
  40                                       const struct of_device_id *match)
  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         /* Register devices with EEH */
  71 #ifdef CONFIG_EEH
  72         if (dev->dev.of_node->child)
  73                 eeh_add_device_tree_early(dev->dev.of_node);
  74 #endif /* CONFIG_EEH */
  75
  76         /* Scan the bus */
  77         pcibios_scan_phb(phb, dev->dev.of_node);
  78         if (phb->bus == NULL)
  79                 return -ENXIO;
  80
  81         /* Claim resources. This might need some rework as well depending
  82          * wether we are doing probe-only or not, like assigning unassigned
  83          * resources etc...
  84          */
  85         pcibios_claim_one_bus(phb->bus);
  86
  87         /* Finish EEH setup */
  88 #ifdef CONFIG_EEH
  89         eeh_add_device_tree_late(phb->bus);
  90 #endif
  91
  92         /* Add probed PCI devices to the device model */
  93         pci_bus_add_devices(phb->bus);
  94
  95         return 0;
  96 }
  97
  98 static struct of_device_id of_pci_phb_ids[] = {
  99         { .type = "pci", },
 100         { .type = "pcix", },
 101         { .type = "pcie", },
 102         { .type = "pciex", },
 103         { .type = "ht", },
 104         {}
 105 };
 106
 107 static struct of_platform_driver of_pci_phb_driver = {
 108         .probe = of_pci_phb_probe,
 109         .driver = {
 110                 .name = "of-pci",
 111                 .owner = THIS_MODULE,
 112                 .of_match_table = of_pci_phb_ids,
 113         },
 114 };
 115
 116 static __init int of_pci_phb_init(void)
 117 {
 118         return of_register_platform_driver(&of_pci_phb_driver);
 119 }
 120
 121 device_initcall(of_pci_phb_init);
 122
 123 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */