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/kobject.h>
28#include <linux/sysfs.h>
29#include <linux/pci.h>
30#include <linux/string.h>
31#include <linux/slab.h>
32
33#include <asm/rtas.h>
34#include "rpaphp.h"
35
36static ssize_t location_read_file (struct hotplug_slot *php_slot, char *buf)
37{
38	char *value;
39	int retval = -ENOENT;
40	struct slot *slot = (struct slot *)php_slot->private;
41
42	if (!slot)
43		return retval;
44
45	value = slot->location;
46	retval = sprintf (buf, "%s\n", value);
47	return retval;
48}
49
50static struct hotplug_slot_attribute php_attr_location = {
51	.attr = {.name = "phy_location", .mode = S_IFREG | S_IRUGO},
52	.show = location_read_file,
53};
54
55/* free up the memory used by a slot */
56static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
57{
58	struct slot *slot = (struct slot *) hotplug_slot->private;
59	dealloc_slot_struct(slot);
60}
61
62void dealloc_slot_struct(struct slot *slot)
63{
64	kfree(slot->hotplug_slot->info);
65	kfree(slot->hotplug_slot->name);
66	kfree(slot->hotplug_slot);
67	kfree(slot->location);
68	kfree(slot);
69}
70
71struct slot *alloc_slot_struct(struct device_node *dn,
72                       int drc_index, char *drc_name, int power_domain)
73{
74	struct slot *slot;
75
76	slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
77	if (!slot)
78		goto error_nomem;
79	slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
80	if (!slot->hotplug_slot)
81		goto error_slot;
82	slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
83					   GFP_KERNEL);
84	if (!slot->hotplug_slot->info)
85		goto error_hpslot;
86	slot->hotplug_slot->name = kmalloc(BUS_ID_SIZE + 1, GFP_KERNEL);
87	if (!slot->hotplug_slot->name)
88		goto error_info;
89	slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
90	if (!slot->location)
91		goto error_name;
92	slot->name = slot->hotplug_slot->name;
93	slot->dn = dn;
94	slot->index = drc_index;
95	strcpy(slot->location, drc_name);
96	slot->power_domain = power_domain;
97	slot->hotplug_slot->private = slot;
98	slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
99	slot->hotplug_slot->release = &rpaphp_release_slot;
100
101	return (slot);
102
103error_name:
104	kfree(slot->hotplug_slot->name);
105error_info:
106	kfree(slot->hotplug_slot->info);
107error_hpslot:
108	kfree(slot->hotplug_slot);
109error_slot:
110	kfree(slot);
111error_nomem:
112	return NULL;
113}
114
115static int is_registered(struct slot *slot)
116{
117	struct slot *tmp_slot;
118
119	list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
120		if (!strcmp(tmp_slot->name, slot->name))
121			return 1;
122	}
123	return 0;
124}
125
126int rpaphp_deregister_slot(struct slot *slot)
127{
128	int retval = 0;
129	struct hotplug_slot *php_slot = slot->hotplug_slot;
130
131	 dbg("%s - Entry: deregistering slot=%s\n",
132		__FUNCTION__, slot->name);
133
134	list_del(&slot->rpaphp_slot_list);
135
136	/* remove "phy_location" file */
137	sysfs_remove_file(&php_slot->kobj, &php_attr_location.attr);
138
139	retval = pci_hp_deregister(php_slot);
140	if (retval)
141		err("Problem unregistering a slot %s\n", slot->name);
142
143	dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
144	return retval;
145}
146EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
147
148int rpaphp_register_slot(struct slot *slot)
149{
150	struct hotplug_slot *php_slot = slot->hotplug_slot;
151	int retval;
152
153	dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
154		__FUNCTION__, slot->dn->full_name, slot->index, slot->name,
155		slot->power_domain, slot->type);
156
157	/* should not try to register the same slot twice */
158	if (is_registered(slot)) {
159		err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
160		return -EAGAIN;
161	}
162
163	retval = pci_hp_register(php_slot);
164	if (retval) {
165		err("pci_hp_register failed with error %d\n", retval);
166		return retval;
167	}
168
169	/* create "phy_location" file */
170	retval = sysfs_create_file(&php_slot->kobj, &php_attr_location.attr);
171	if (retval) {
172		err("sysfs_create_file failed with error %d\n", retval);
173		goto sysfs_fail;
174	}
175
176	/* add slot to our internal list */
177	list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
178	info("Slot [%s](PCI location=%s) registered\n", slot->name,
179			slot->location);
180	return 0;
181
182sysfs_fail:
183	pci_hp_deregister(php_slot);
184	return retval;
185}
186