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