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