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/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
  40 static 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(PCI_DN(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
 100 static const 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
 109 static struct platform_driver of_pci_phb_driver = {
 110         .probe = of_pci_phb_probe,
 111         .driver = {
 112                 .name = "of-pci",
 113                 .of_match_table = of_pci_phb_ids,
 114         },
 115 };
 116
 117 builtin_platform_driver(of_pci_phb_driver);
 118
 119 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */