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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 */ | |
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
117 | int rpaphp_register_slot(struct slot *slot) | |
118 | { | |
119 | struct hotplug_slot *php_slot = slot->hotplug_slot; | |
120 | int retval; | |
121 | int slotno; | |
122 | ||
123 | dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n", | |
124 | __func__, slot->dn->full_name, slot->index, slot->name, | |
125 | slot->power_domain, slot->type); | |
126 | ||
127 | /* should not try to register the same slot twice */ | |
128 | if (is_registered(slot)) { | |
129 | err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name); | |
130 | return -EAGAIN; | |
131 | } | |
132 | ||
133 | if (slot->dn->child) | |
134 | slotno = PCI_SLOT(PCI_DN(slot->dn->child)->devfn); | |
135 | else | |
136 | slotno = -1; | |
137 | retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name); | |
138 | if (retval) { | |
139 | err("pci_hp_register failed with error %d\n", retval); | |
140 | return retval; | |
141 | } | |
142 | ||
143 | /* add slot to our internal list */ | |
144 | list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head); | |
145 | info("Slot [%s] registered\n", slot->name); | |
146 | return 0; | |
147 | } |