1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
4*4882a593Smuzhiyun * for RPA-compliant PPC64 platform.
5*4882a593Smuzhiyun * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
6*4882a593Smuzhiyun * Copyright (C) 2005 International Business Machines
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Updates, 2005, John Rose <johnrose@austin.ibm.com>
9*4882a593Smuzhiyun * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/pci.h>
13*4882a593Smuzhiyun #include <linux/export.h>
14*4882a593Smuzhiyun #include <asm/pci-bridge.h>
15*4882a593Smuzhiyun #include <asm/ppc-pci.h>
16*4882a593Smuzhiyun #include <asm/firmware.h>
17*4882a593Smuzhiyun #include <asm/eeh.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include "pseries.h"
20*4882a593Smuzhiyun
init_phb_dynamic(struct device_node * dn)21*4882a593Smuzhiyun struct pci_controller *init_phb_dynamic(struct device_node *dn)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun struct pci_controller *phb;
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun pr_debug("PCI: Initializing new hotplug PHB %pOF\n", dn);
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun phb = pcibios_alloc_controller(dn);
28*4882a593Smuzhiyun if (!phb)
29*4882a593Smuzhiyun return NULL;
30*4882a593Smuzhiyun rtas_setup_phb(phb);
31*4882a593Smuzhiyun pci_process_bridge_OF_ranges(phb, dn, 0);
32*4882a593Smuzhiyun phb->controller_ops = pseries_pci_controller_ops;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun pci_devs_phb_init_dynamic(phb);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun /* Create EEH devices for the PHB */
37*4882a593Smuzhiyun eeh_phb_pe_create(phb);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun if (dn->child)
40*4882a593Smuzhiyun pseries_eeh_init_edev_recursive(PCI_DN(dn));
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun pcibios_scan_phb(phb);
43*4882a593Smuzhiyun pcibios_finish_adding_to_bus(phb->bus);
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun return phb;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(init_phb_dynamic);
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun /* RPA-specific bits for removing PHBs */
remove_phb_dynamic(struct pci_controller * phb)50*4882a593Smuzhiyun int remove_phb_dynamic(struct pci_controller *phb)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun struct pci_bus *b = phb->bus;
53*4882a593Smuzhiyun struct pci_host_bridge *host_bridge = to_pci_host_bridge(b->bridge);
54*4882a593Smuzhiyun struct resource *res;
55*4882a593Smuzhiyun int rc, i;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun pr_debug("PCI: Removing PHB %04x:%02x...\n",
58*4882a593Smuzhiyun pci_domain_nr(b), b->number);
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun /* We cannot to remove a root bus that has children */
61*4882a593Smuzhiyun if (!(list_empty(&b->children) && list_empty(&b->devices)))
62*4882a593Smuzhiyun return -EBUSY;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun /* We -know- there aren't any child devices anymore at this stage
65*4882a593Smuzhiyun * and thus, we can safely unmap the IO space as it's not in use
66*4882a593Smuzhiyun */
67*4882a593Smuzhiyun res = &phb->io_resource;
68*4882a593Smuzhiyun if (res->flags & IORESOURCE_IO) {
69*4882a593Smuzhiyun rc = pcibios_unmap_io_space(b);
70*4882a593Smuzhiyun if (rc) {
71*4882a593Smuzhiyun printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
72*4882a593Smuzhiyun __func__, b->name);
73*4882a593Smuzhiyun return 1;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun }
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun /* Remove the PCI bus and unregister the bridge device from sysfs */
78*4882a593Smuzhiyun phb->bus = NULL;
79*4882a593Smuzhiyun pci_remove_bus(b);
80*4882a593Smuzhiyun host_bridge->bus = NULL;
81*4882a593Smuzhiyun device_unregister(&host_bridge->dev);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun /* Now release the IO resource */
84*4882a593Smuzhiyun if (res->flags & IORESOURCE_IO)
85*4882a593Smuzhiyun release_resource(res);
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun /* Release memory resources */
88*4882a593Smuzhiyun for (i = 0; i < 3; ++i) {
89*4882a593Smuzhiyun res = &phb->mem_resources[i];
90*4882a593Smuzhiyun if (!(res->flags & IORESOURCE_MEM))
91*4882a593Smuzhiyun continue;
92*4882a593Smuzhiyun release_resource(res);
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun /*
96*4882a593Smuzhiyun * The pci_controller data structure is freed by
97*4882a593Smuzhiyun * the pcibios_free_controller_deferred() callback;
98*4882a593Smuzhiyun * see pseries_root_bridge_prepare().
99*4882a593Smuzhiyun */
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun return 0;
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(remove_phb_dynamic);
104