1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
4 * for RPA-compliant PPC64 platform.
5 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
6 * Copyright (C) 2005 International Business Machines
7 *
8 * Updates, 2005, John Rose <johnrose@austin.ibm.com>
9 * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
10 */
11
12#include <linux/pci.h>
13#include <linux/export.h>
14#include <asm/pci-bridge.h>
15#include <asm/ppc-pci.h>
16#include <asm/firmware.h>
17#include <asm/eeh.h>
18
19#include "pseries.h"
20
21struct pci_controller *init_phb_dynamic(struct device_node *dn)
22{
23	struct pci_controller *phb;
24
25	pr_debug("PCI: Initializing new hotplug PHB %pOF\n", dn);
26
27	phb = pcibios_alloc_controller(dn);
28	if (!phb)
29		return NULL;
30	rtas_setup_phb(phb);
31	pci_process_bridge_OF_ranges(phb, dn, 0);
32	phb->controller_ops = pseries_pci_controller_ops;
33
34	pci_devs_phb_init_dynamic(phb);
35
36	/* Create EEH devices for the PHB */
37	eeh_phb_pe_create(phb);
38
39	if (dn->child)
40		pseries_eeh_init_edev_recursive(PCI_DN(dn));
41
42	pcibios_scan_phb(phb);
43	pcibios_finish_adding_to_bus(phb->bus);
44
45	return phb;
46}
47EXPORT_SYMBOL_GPL(init_phb_dynamic);
48
49/* RPA-specific bits for removing PHBs */
50int remove_phb_dynamic(struct pci_controller *phb)
51{
52	struct pci_bus *b = phb->bus;
53	struct pci_host_bridge *host_bridge = to_pci_host_bridge(b->bridge);
54	struct resource *res;
55	int rc, i;
56
57	pr_debug("PCI: Removing PHB %04x:%02x...\n",
58		 pci_domain_nr(b), b->number);
59
60	/* We cannot to remove a root bus that has children */
61	if (!(list_empty(&b->children) && list_empty(&b->devices)))
62		return -EBUSY;
63
64	/* We -know- there aren't any child devices anymore at this stage
65	 * and thus, we can safely unmap the IO space as it's not in use
66	 */
67	res = &phb->io_resource;
68	if (res->flags & IORESOURCE_IO) {
69		rc = pcibios_unmap_io_space(b);
70		if (rc) {
71			printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
72			       __func__, b->name);
73			return 1;
74		}
75	}
76
77	/* Remove the PCI bus and unregister the bridge device from sysfs */
78	phb->bus = NULL;
79	pci_remove_bus(b);
80	host_bridge->bus = NULL;
81	device_unregister(&host_bridge->dev);
82
83	/* Now release the IO resource */
84	if (res->flags & IORESOURCE_IO)
85		release_resource(res);
86
87	/* Release memory resources */
88	for (i = 0; i < 3; ++i) {
89		res = &phb->mem_resources[i];
90		if (!(res->flags & IORESOURCE_MEM))
91			continue;
92		release_resource(res);
93	}
94
95	/*
96	 * The pci_controller data structure is freed by
97	 * the pcibios_free_controller_deferred() callback;
98	 * see pseries_root_bridge_prepare().
99	 */
100
101	return 0;
102}
103EXPORT_SYMBOL_GPL(remove_phb_dynamic);
104