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/of.h>
12 #include <linux/pci.h>
13 #include <linux/string.h>
14
15 #include <asm/pci-bridge.h>
16 #include <asm/rtas.h>
17 #include <asm/machdep.h>
18
19 #include "../pci.h" /* for pci_add_new_bus */
20 #include "rpaphp.h"
21
rpaphp_get_sensor_state(struct slot * slot,int * state)22 int rpaphp_get_sensor_state(struct slot *slot, int *state)
23 {
24 int rc;
25 int setlevel;
26
27 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
28
29 if (rc < 0) {
30 if (rc == -EFAULT || rc == -EEXIST) {
31 dbg("%s: slot must be power up to get sensor-state\n",
32 __func__);
33
34 /* some slots have to be powered up
35 * before get-sensor will succeed.
36 */
37 rc = rtas_set_power_level(slot->power_domain, POWER_ON,
38 &setlevel);
39 if (rc < 0) {
40 dbg("%s: power on slot[%s] failed rc=%d.\n",
41 __func__, slot->name, rc);
42 } else {
43 rc = rtas_get_sensor(DR_ENTITY_SENSE,
44 slot->index, state);
45 }
46 } else if (rc == -ENODEV)
47 info("%s: slot is unusable\n", __func__);
48 else
49 err("%s failed to get sensor state\n", __func__);
50 }
51 return rc;
52 }
53
54 /**
55 * rpaphp_enable_slot - record slot state, config pci device
56 * @slot: target &slot
57 *
58 * Initialize values in the slot structure to indicate if there is a pci card
59 * plugged into the slot. If the slot is not empty, run the pcibios routine
60 * to get pcibios stuff correctly set up.
61 */
rpaphp_enable_slot(struct slot * slot)62 int rpaphp_enable_slot(struct slot *slot)
63 {
64 int rc, level, state;
65 struct pci_bus *bus;
66
67 slot->state = EMPTY;
68
69 /* Find out if the power is turned on for the slot */
70 rc = rtas_get_power_level(slot->power_domain, &level);
71 if (rc)
72 return rc;
73
74 /* Figure out if there is an adapter in the slot */
75 rc = rpaphp_get_sensor_state(slot, &state);
76 if (rc)
77 return rc;
78
79 bus = pci_find_bus_by_node(slot->dn);
80 if (!bus) {
81 err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn);
82 return -EINVAL;
83 }
84
85 slot->bus = bus;
86 slot->pci_devs = &bus->devices;
87
88 /* if there's an adapter in the slot, go add the pci devices */
89 if (state == PRESENT) {
90 slot->state = NOT_CONFIGURED;
91
92 /* non-empty slot has to have child */
93 if (!slot->dn->child) {
94 err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
95 __func__, slot->name);
96 return -EINVAL;
97 }
98
99 if (list_empty(&bus->devices)) {
100 pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));
101 pci_hp_add_devices(bus);
102 }
103
104 if (!list_empty(&bus->devices)) {
105 slot->state = CONFIGURED;
106 }
107
108 if (rpaphp_debug) {
109 struct pci_dev *dev;
110 dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn);
111 list_for_each_entry(dev, &bus->devices, bus_list)
112 dbg("\t%s\n", pci_name(dev));
113 }
114 }
115
116 return 0;
117 }
118