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/platform_device.h>
  17 #include <linux/atomic.h>
  18
  19 #include <asm/errno.h>
  20 #include <asm/topology.h>
  21 #include <asm/pci-bridge.h>
  22 #include <asm/ppc-pci.h>
  23 #include <asm/eeh.h>
  24
  25 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
  26
  27 /* The probing of PCI controllers from of_platform is currently
  28  * 64 bits only, mostly due to gratuitous differences between
  29  * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
  30  * lacking some bits needed here.
  31  */
  32
  33 static int of_pci_phb_probe(struct platform_device *dev)
  34 {
  35         struct pci_controller *phb;
  36
  37         /* Check if we can do that ... */
  38         if (ppc_md.pci_setup_phb == NULL)
  39                 return -ENODEV;
  40
  41         pr_info("Setting up PCI bus %pOF\n", dev->dev.of_node);
  42
  43         /* Alloc and setup PHB data structure */
  44         phb = pcibios_alloc_controller(dev->dev.of_node);
  45         if (!phb)
  46                 return -ENODEV;
  47
  48         /* Setup parent in sysfs */
  49         phb->parent = &dev->dev;
  50
  51         /* Setup the PHB using arch provided callback */
  52         if (ppc_md.pci_setup_phb(phb)) {
  53                 pcibios_free_controller(phb);
  54                 return -ENODEV;
  55         }
  56
  57         /* Process "ranges" property */
  58         pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);
  59
  60         /* Init pci_dn data structures */
  61         pci_devs_phb_init_dynamic(phb);
  62
  63         /* Create EEH PE for the PHB */
  64         eeh_phb_pe_create(phb);
  65
  66         /* Scan the bus */
  67         pcibios_scan_phb(phb);
  68         if (phb->bus == NULL)
  69                 return -ENXIO;
  70
  71         /* Claim resources. This might need some rework as well depending
  72          * whether we are doing probe-only or not, like assigning unassigned
  73          * resources etc...
  74          */
  75         pcibios_claim_one_bus(phb->bus);
  76
  77         /* Add probed PCI devices to the device model */
  78         pci_bus_add_devices(phb->bus);
  79
  80         return 0;
  81 }
  82
  83 static const struct of_device_id of_pci_phb_ids[] = {
  84         { .type = "pci", },
  85         { .type = "pcix", },
  86         { .type = "pcie", },
  87         { .type = "pciex", },
  88         { .type = "ht", },
  89         {}
  90 };
  91
  92 static struct platform_driver of_pci_phb_driver = {
  93         .probe = of_pci_phb_probe,
  94         .driver = {
  95                 .name = "of-pci",
  96                 .of_match_table = of_pci_phb_ids,
  97         },
  98 };
  99
 100 builtin_platform_driver(of_pci_phb_driver);
 101
 102 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */