1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
4 * Copyright (C) 2003 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/pci.h>
12#include <linux/string.h>
13
14#include <asm/pci-bridge.h>
15#include <asm/rtas.h>
16#include <asm/machdep.h>
17
18#include "../pci.h"		/* for pci_add_new_bus */
19#include "rpaphp.h"
20
21int rpaphp_get_sensor_state(struct slot *slot, int *state)
22{
23	int rc;
24	int setlevel;
25
26	rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
27
28	if (rc < 0) {
29		if (rc == -EFAULT || rc == -EEXIST) {
30			dbg("%s: slot must be power up to get sensor-state\n",
31			    __func__);
32
33			/* some slots have to be powered up
34			 * before get-sensor will succeed.
35			 */
36			rc = rtas_set_power_level(slot->power_domain, POWER_ON,
37						  &setlevel);
38			if (rc < 0) {
39				dbg("%s: power on slot[%s] failed rc=%d.\n",
40				    __func__, slot->name, rc);
41			} else {
42				rc = rtas_get_sensor(DR_ENTITY_SENSE,
43						     slot->index, state);
44			}
45		} else if (rc == -ENODEV)
46			info("%s: slot is unusable\n", __func__);
47		else
48			err("%s failed to get sensor state\n", __func__);
49	}
50	return rc;
51}
52
53/**
54 * rpaphp_enable_slot - record slot state, config pci device
55 * @slot: target &slot
56 *
57 * Initialize values in the slot structure to indicate if there is a pci card
58 * plugged into the slot. If the slot is not empty, run the pcibios routine
59 * to get pcibios stuff correctly set up.
60 */
61int rpaphp_enable_slot(struct slot *slot)
62{
63	int rc, level, state;
64	struct pci_bus *bus;
65
66	slot->state = EMPTY;
67
68	/* Find out if the power is turned on for the slot */
69	rc = rtas_get_power_level(slot->power_domain, &level);
70	if (rc)
71		return rc;
72
73	/* Figure out if there is an adapter in the slot */
74	rc = rpaphp_get_sensor_state(slot, &state);
75	if (rc)
76		return rc;
77
78	bus = pci_find_bus_by_node(slot->dn);
79	if (!bus) {
80		err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn);
81		return -EINVAL;
82	}
83
84	slot->bus = bus;
85	slot->pci_devs = &bus->devices;
86
87	/* if there's an adapter in the slot, go add the pci devices */
88	if (state == PRESENT) {
89		slot->state = NOT_CONFIGURED;
90
91		/* non-empty slot has to have child */
92		if (!slot->dn->child) {
93			err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
94			    __func__, slot->name);
95			return -EINVAL;
96		}
97
98		if (list_empty(&bus->devices)) {
99			pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));
100			pci_hp_add_devices(bus);
101		}
102
103		if (!list_empty(&bus->devices)) {
104			slot->state = CONFIGURED;
105		}
106
107		if (rpaphp_debug) {
108			struct pci_dev *dev;
109			dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn);
110			list_for_each_entry(dev, &bus->devices, bus_list)
111				dbg("\t%s\n", pci_name(dev));
112		}
113	}
114
115	return 0;
116}
117