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 */
36static 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
42void 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
50struct 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
77error_info:
78	kfree(slot->hotplug_slot->info);
79error_hpslot:
80	kfree(slot->hotplug_slot);
81error_slot:
82	kfree(slot);
83error_nomem:
84	return NULL;
85}
86
87static 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
98int 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}
115EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
116
117int 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}
148