arch/powerpc/kernel/of_platform.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
   4  *                       <benh@kernel.crashing.org>
   5  *    and                Arnd Bergmann, IBM Corp.
   6  */
   7
   8 #undef DEBUG
   9
  10 #include <linux/string.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/export.h>
  14 #include <linux/mod_devicetable.h>
  15 #include <linux/pci.h>
  16 #include <linux/of.h>
  17 #include <linux/of_device.h>
  18 #include <linux/of_platform.h>
  19 #include <linux/atomic.h>
  20
  21 #include <asm/errno.h>
  22 #include <asm/topology.h>
  23 #include <asm/pci-bridge.h>
  24 #include <asm/ppc-pci.h>
  25 #include <asm/eeh.h>
  26
  27 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
  28
  29 /* The probing of PCI controllers from of_platform is currently
  30  * 64 bits only, mostly due to gratuitous differences between
  31  * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
  32  * lacking some bits needed here.
  33  */
  34
  35 static int of_pci_phb_probe(struct platform_device *dev)
  36 {
  37         struct pci_controller *phb;
  38
  39         /* Check if we can do that ... */
  40         if (ppc_md.pci_setup_phb == NULL)
  41                 return -ENODEV;
  42
  43         pr_info("Setting up PCI bus %pOF\n", dev->dev.of_node);
  44
  45         /* Alloc and setup PHB data structure */
  46         phb = pcibios_alloc_controller(dev->dev.of_node);
  47         if (!phb)
  48                 return -ENODEV;
  49
  50         /* Setup parent in sysfs */
  51         phb->parent = &dev->dev;
  52
  53         /* Setup the PHB using arch provided callback */
  54         if (ppc_md.pci_setup_phb(phb)) {
  55                 pcibios_free_controller(phb);
  56                 return -ENODEV;
  57         }
  58
  59         /* Process "ranges" property */
  60         pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);
  61
  62         /* Init pci_dn data structures */
  63         pci_devs_phb_init_dynamic(phb);
  64
  65         /* Create EEH devices for the PHB */
  66         eeh_dev_phb_init_dynamic(phb);
  67
  68         /* Register devices with EEH */
  69         if (dev->dev.of_node->child)
  70                 eeh_add_device_tree_early(PCI_DN(dev->dev.of_node));
  71
  72         /* Scan the bus */
  73         pcibios_scan_phb(phb);
  74         if (phb->bus == NULL)
  75                 return -ENXIO;
  76
  77         /* Claim resources. This might need some rework as well depending
  78          * whether we are doing probe-only or not, like assigning unassigned
  79          * resources etc...
  80          */
  81         pcibios_claim_one_bus(phb->bus);
  82
  83         /* Finish EEH setup */
  84         eeh_add_device_tree_late(phb->bus);
  85
  86         /* Add probed PCI devices to the device model */
  87         pci_bus_add_devices(phb->bus);
  88
  89         /* sysfs files should only be added after devices are added */
  90         eeh_add_sysfs_files(phb->bus);
  91
  92         return 0;
  93 }
  94
  95 static const struct of_device_id of_pci_phb_ids[] = {
  96         { .type = "pci", },
  97         { .type = "pcix", },
  98         { .type = "pcie", },
  99         { .type = "pciex", },
 100         { .type = "ht", },
 101         {}
 102 };
 103
 104 static struct platform_driver of_pci_phb_driver = {
 105         .probe = of_pci_phb_probe,
 106         .driver = {
 107                 .name = "of-pci",
 108                 .of_match_table = of_pci_phb_ids,
 109         },
 110 };
 111
 112 builtin_platform_driver(of_pci_phb_driver);
 113
 114 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */