1 /*
2 * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
3 * for RPA-compliant PPC64 platform.
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 *
10 * All rights reserved.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
20 * NON INFRINGEMENT. See the GNU General Public License for more
21 * details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28 #include <linux/pci.h>
29 #include <linux/export.h>
30 #include <asm/pci-bridge.h>
31 #include <asm/ppc-pci.h>
32 #include <asm/firmware.h>
33 #include <asm/eeh.h>
34
35 #include "pseries.h"
36
37 struct pci_controller *init_phb_dynamic(struct device_node *dn)
38 {
39 struct pci_controller *phb;
40
41 pr_debug("PCI: Initializing new hotplug PHB %pOF\n", dn);
42
43 phb = pcibios_alloc_controller(dn);
44 if (!phb)
45 return NULL;
46 rtas_setup_phb(phb);
47 pci_process_bridge_OF_ranges(phb, dn, 0);
48 phb->controller_ops = pseries_pci_controller_ops;
49
50 pci_devs_phb_init_dynamic(phb);
51
52 /* Create EEH devices for the PHB */
53 eeh_dev_phb_init_dynamic(phb);
54
55 if (dn->child)
56 eeh_add_device_tree_early(PCI_DN(dn));
57
58 pcibios_scan_phb(phb);
59 pcibios_finish_adding_to_bus(phb->bus);
60
61 return phb;
62 }
63 EXPORT_SYMBOL_GPL(init_phb_dynamic);
64
65 /* RPA-specific bits for removing PHBs */
66 int remove_phb_dynamic(struct pci_controller *phb)
67 {
68 struct pci_bus *b = phb->bus;
69 struct resource *res;
70 int rc, i;
71
72 pr_debug("PCI: Removing PHB %04x:%02x...\n",
73 pci_domain_nr(b), b->number);
74
75 /* We cannot to remove a root bus that has children */
76 if (!(list_empty(&b->children) && list_empty(&b->devices)))
77 return -EBUSY;
78
79 /* We -know- there aren't any child devices anymore at this stage
80 * and thus, we can safely unmap the IO space as it's not in use
81 */
82 res = &phb->io_resource;
83 if (res->flags & IORESOURCE_IO) {
84 rc = pcibios_unmap_io_space(b);
85 if (rc) {
86 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
87 __func__, b->name);
88 return 1;
89 }
90 }
91
92 /* Remove the PCI bus and unregister the bridge device from sysfs */
93 phb->bus = NULL;
94 pci_remove_bus(b);
95 device_unregister(b->bridge);
96
97 /* Now release the IO resource */
98 if (res->flags & IORESOURCE_IO)
99 release_resource(res);
100
101 /* Release memory resources */
102 for (i = 0; i < 3; ++i) {
103 res = &phb->mem_resources[i];
104 if (!(res->flags & IORESOURCE_MEM))
105 continue;
106 release_resource(res);
107 }
108
109 /*
110 * The pci_controller data structure is freed by
111 * the pcibios_free_controller_deferred() callback;
112 * see pseries_root_bridge_prepare().
113 */
114
115 return 0;
116 }
117 EXPORT_SYMBOL_GPL(remove_phb_dynamic);