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);
118