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 */ 120