1 /*
2 * RPA Virtual I/O device functions
3 * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
4 *
5 * All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or (at
10 * your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
15 * NON INFRINGEMENT. See the GNU General Public License for more
16 * details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * Send feedback to <lxie@us.ibm.com>
23 *
24 */
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/sysfs.h>
28 #include <linux/pci.h>
29 #include <linux/string.h>
30 #include <linux/slab.h>
31
32 #include <asm/rtas.h>
33 #include "rpaphp.h"
34
35 /* free up the memory used by a slot */
rpaphp_release_slot(struct hotplug_slot * hotplug_slot)36 static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
37 {
38 struct slot *slot = (struct slot *) hotplug_slot->private;
39 dealloc_slot_struct(slot);
40 }
41
dealloc_slot_struct(struct slot * slot)42 void dealloc_slot_struct(struct slot *slot)
43 {
44 kfree(slot->hotplug_slot->info);
45 kfree(slot->name);
46 kfree(slot->hotplug_slot);
47 kfree(slot);
48 }
49
alloc_slot_struct(struct device_node * dn,int drc_index,char * drc_name,int power_domain)50 struct slot *alloc_slot_struct(struct device_node *dn,
51 int drc_index, char *drc_name, int power_domain)
52 {
53 struct slot *slot;
54
55 slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
56 if (!slot)
57 goto error_nomem;
58 slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
59 if (!slot->hotplug_slot)
60 goto error_slot;
61 slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
62 GFP_KERNEL);
63 if (!slot->hotplug_slot->info)
64 goto error_hpslot;
65 slot->name = kstrdup(drc_name, GFP_KERNEL);
66 if (!slot->name)
67 goto error_info;
68 slot->dn = dn;
69 slot->index = drc_index;
70 slot->power_domain = power_domain;
71 slot->hotplug_slot->private = slot;
72 slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
73 slot->hotplug_slot->release = &rpaphp_release_slot;
74
75 return (slot);
76
77 error_info:
78 kfree(slot->hotplug_slot->info);
79 error_hpslot:
80 kfree(slot->hotplug_slot);
81 error_slot:
82 kfree(slot);
83 error_nomem:
84 return NULL;
85 }
86
is_registered(struct slot * slot)87 static int is_registered(struct slot *slot)
88 {
89 struct slot *tmp_slot;
90
91 list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
92 if (!strcmp(tmp_slot->name, slot->name))
93 return 1;
94 }
95 return 0;
96 }
97
rpaphp_deregister_slot(struct slot * slot)98 int rpaphp_deregister_slot(struct slot *slot)
99 {
100 int retval = 0;
101 struct hotplug_slot *php_slot = slot->hotplug_slot;
102
103 dbg("%s - Entry: deregistering slot=%s\n",
104 __func__, slot->name);
105
106 list_del(&slot->rpaphp_slot_list);
107
108 retval = pci_hp_deregister(php_slot);
109 if (retval)
110 err("Problem unregistering a slot %s\n", slot->name);
111
112 dbg("%s - Exit: rc[%d]\n", __func__, retval);
113 return retval;
114 }
115 EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
116
rpaphp_register_slot(struct slot * slot)117 int rpaphp_register_slot(struct slot *slot)
118 {
119 struct hotplug_slot *php_slot = slot->hotplug_slot;
120 struct device_node *child;
121 u32 my_index;
122 int retval;
123 int slotno = -1;
124
125 dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
126 __func__, slot->dn->full_name, slot->index, slot->name,
127 slot->power_domain, slot->type);
128
129 /* should not try to register the same slot twice */
130 if (is_registered(slot)) {
131 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
132 return -EAGAIN;
133 }
134
135 for_each_child_of_node(slot->dn, child) {
136 retval = of_property_read_u32(child, "ibm,my-drc-index", &my_index);
137 if (my_index == slot->index) {
138 slotno = PCI_SLOT(PCI_DN(child)->devfn);
139 of_node_put(child);
140 break;
141 }
142 }
143
144 retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
145 if (retval) {
146 err("pci_hp_register failed with error %d\n", retval);
147 return retval;
148 }
149
150 /* add slot to our internal list */
151 list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
152 info("Slot [%s] registered\n", slot->name);
153 return 0;
154 }
155