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 */
30void 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 */
42void 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
59EXPORT_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 */
72void pcibios_add_pci_devices(struct pci_bus * bus)
73{
74	int slotno, mode, pass, max;
75	struct pci_dev *dev;
76	struct pci_controller *phb;
77	struct device_node *dn = pci_bus_to_OF_node(bus);
78
79	eeh_add_device_tree_early(PCI_DN(dn));
80
81	phb = pci_bus_to_host(bus);
82
83	mode = PCI_PROBE_NORMAL;
84	if (phb->controller_ops.probe_mode)
85		mode = phb->controller_ops.probe_mode(bus);
86
87	if (mode == PCI_PROBE_DEVTREE) {
88		/* use ofdt-based probe */
89		of_rescan_bus(dn, bus);
90	} else if (mode == PCI_PROBE_NORMAL) {
91		/*
92		 * Use legacy probe. In the partial hotplug case, we
93		 * probably have grandchildren devices unplugged. So
94		 * we don't check the return value from pci_scan_slot() in
95		 * order for fully rescan all the way down to pick them up.
96		 * They can have been removed during partial hotplug.
97		 */
98		slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
99		pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
100		pcibios_setup_bus_devices(bus);
101		max = bus->busn_res.start;
102		for (pass = 0; pass < 2; pass++) {
103			list_for_each_entry(dev, &bus->devices, bus_list) {
104				if (pci_is_bridge(dev))
105					max = pci_scan_bridge(bus, dev,
106							      max, pass);
107			}
108		}
109	}
110	pcibios_finish_adding_to_bus(bus);
111}
112EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
113