1 /*
2  * Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c"
3  *
4  * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
5  * Copyright (C) 2005 International Business Machines
6  *
7  * Updates, 2005, John Rose <johnrose@austin.ibm.com>
8  * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
9  * Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  */
16 
17 #include <linux/pci.h>
18 #include <linux/export.h>
19 #include <asm/pci-bridge.h>
20 #include <asm/ppc-pci.h>
21 #include <asm/firmware.h>
22 #include <asm/eeh.h>
23 
24 /**
25  * pcibios_release_device - release PCI device
26  * @dev: PCI device
27  *
28  * The function is called before releasing the indicated PCI device.
29  */
30 void pcibios_release_device(struct pci_dev *dev)
31 {
32 	eeh_remove_device(dev);
33 }
34 
35 /**
36  * pcibios_remove_pci_devices - remove all devices under this bus
37  * @bus: the indicated PCI bus
38  *
39  * Remove all of the PCI devices under this bus both from the
40  * linux pci device tree, and from the powerpc EEH address cache.
41  */
42 void pcibios_remove_pci_devices(struct pci_bus *bus)
43 {
44 	struct pci_dev *dev, *tmp;
45 	struct pci_bus *child_bus;
46 
47 	/* First go down child busses */
48 	list_for_each_entry(child_bus, &bus->children, node)
49 		pcibios_remove_pci_devices(child_bus);
50 
51 	pr_debug("PCI: Removing devices on bus %04x:%02x\n",
52 		 pci_domain_nr(bus),  bus->number);
53 	list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
54 		pr_debug("   Removing %s...\n", pci_name(dev));
55 		pci_stop_and_remove_bus_device(dev);
56 	}
57 }
58 
59 EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
60 
61 /**
62  * pcibios_add_pci_devices - adds new pci devices to bus
63  * @bus: the indicated PCI bus
64  *
65  * This routine will find and fixup new pci devices under
66  * the indicated bus. This routine presumes that there
67  * might already be some devices under this bridge, so
68  * it carefully tries to add only new devices.  (And that
69  * is how this routine differs from other, similar pcibios
70  * routines.)
71  */
72 void pcibios_add_pci_devices(struct pci_bus * bus)
73 {
74 	int slotno, mode, pass, max;
75 	struct pci_dev *dev;
76 	struct device_node *dn = pci_bus_to_OF_node(bus);
77 
78 	eeh_add_device_tree_early(dn);
79 
80 	mode = PCI_PROBE_NORMAL;
81 	if (ppc_md.pci_probe_mode)
82 		mode = ppc_md.pci_probe_mode(bus);
83 
84 	if (mode == PCI_PROBE_DEVTREE) {
85 		/* use ofdt-based probe */
86 		of_rescan_bus(dn, bus);
87 	} else if (mode == PCI_PROBE_NORMAL) {
88 		/*
89 		 * Use legacy probe. In the partial hotplug case, we
90 		 * probably have grandchildren devices unplugged. So
91 		 * we don't check the return value from pci_scan_slot() in
92 		 * order for fully rescan all the way down to pick them up.
93 		 * They can have been removed during partial hotplug.
94 		 */
95 		slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
96 		pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
97 		pcibios_setup_bus_devices(bus);
98 		max = bus->busn_res.start;
99 		for (pass = 0; pass < 2; pass++) {
100 			list_for_each_entry(dev, &bus->devices, bus_list) {
101 				if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
102 				    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
103 					max = pci_scan_bridge(bus, dev,
104 							      max, pass);
105 			}
106 		}
107 	}
108 	pcibios_finish_adding_to_bus(bus);
109 }
110 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
111