1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * RPA Virtual I/O device functions
4 * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
5 *
6 * All rights reserved.
7 *
8 * Send feedback to <lxie@us.ibm.com>
9 *
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/sysfs.h>
14#include <linux/of.h>
15#include <linux/pci.h>
16#include <linux/string.h>
17#include <linux/slab.h>
18
19#include <asm/rtas.h>
20#include "rpaphp.h"
21
22/* free up the memory used by a slot */
23void dealloc_slot_struct(struct slot *slot)
24{
25	of_node_put(slot->dn);
26	kfree(slot->name);
27	kfree(slot);
28}
29
30struct slot *alloc_slot_struct(struct device_node *dn,
31		int drc_index, char *drc_name, int power_domain)
32{
33	struct slot *slot;
34
35	slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
36	if (!slot)
37		goto error_nomem;
38	slot->name = kstrdup(drc_name, GFP_KERNEL);
39	if (!slot->name)
40		goto error_slot;
41	slot->dn = of_node_get(dn);
42	slot->index = drc_index;
43	slot->power_domain = power_domain;
44	slot->hotplug_slot.ops = &rpaphp_hotplug_slot_ops;
45
46	return (slot);
47
48error_slot:
49	kfree(slot);
50error_nomem:
51	return NULL;
52}
53
54static int is_registered(struct slot *slot)
55{
56	struct slot *tmp_slot;
57
58	list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
59		if (!strcmp(tmp_slot->name, slot->name))
60			return 1;
61	}
62	return 0;
63}
64
65int rpaphp_deregister_slot(struct slot *slot)
66{
67	int retval = 0;
68	struct hotplug_slot *php_slot = &slot->hotplug_slot;
69
70	 dbg("%s - Entry: deregistering slot=%s\n",
71		__func__, slot->name);
72
73	list_del(&slot->rpaphp_slot_list);
74	pci_hp_deregister(php_slot);
75	dealloc_slot_struct(slot);
76
77	dbg("%s - Exit: rc[%d]\n", __func__, retval);
78	return retval;
79}
80EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
81
82int rpaphp_register_slot(struct slot *slot)
83{
84	struct hotplug_slot *php_slot = &slot->hotplug_slot;
85	struct device_node *child;
86	u32 my_index;
87	int retval;
88	int slotno = -1;
89
90	dbg("%s registering slot:path[%pOF] index[%x], name[%s] pdomain[%x] type[%d]\n",
91		__func__, slot->dn, slot->index, slot->name,
92		slot->power_domain, slot->type);
93
94	/* should not try to register the same slot twice */
95	if (is_registered(slot)) {
96		err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
97		return -EAGAIN;
98	}
99
100	for_each_child_of_node(slot->dn, child) {
101		retval = of_property_read_u32(child, "ibm,my-drc-index", &my_index);
102		if (my_index == slot->index) {
103			slotno = PCI_SLOT(PCI_DN(child)->devfn);
104			of_node_put(child);
105			break;
106		}
107	}
108
109	retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
110	if (retval) {
111		err("pci_hp_register failed with error %d\n", retval);
112		return retval;
113	}
114
115	/* add slot to our internal list */
116	list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
117	info("Slot [%s] registered\n", slot->name);
118	return 0;
119}
120