1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
4*4882a593Smuzhiyun * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * All rights reserved.
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Send feedback to <lxie@us.ibm.com>
9*4882a593Smuzhiyun *
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun #include <linux/pci.h>
12*4882a593Smuzhiyun #include <linux/string.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <asm/pci-bridge.h>
15*4882a593Smuzhiyun #include <asm/rtas.h>
16*4882a593Smuzhiyun #include <asm/machdep.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #include "../pci.h" /* for pci_add_new_bus */
19*4882a593Smuzhiyun #include "rpaphp.h"
20*4882a593Smuzhiyun
rpaphp_get_sensor_state(struct slot * slot,int * state)21*4882a593Smuzhiyun int rpaphp_get_sensor_state(struct slot *slot, int *state)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun int rc;
24*4882a593Smuzhiyun int setlevel;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun if (rc < 0) {
29*4882a593Smuzhiyun if (rc == -EFAULT || rc == -EEXIST) {
30*4882a593Smuzhiyun dbg("%s: slot must be power up to get sensor-state\n",
31*4882a593Smuzhiyun __func__);
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun /* some slots have to be powered up
34*4882a593Smuzhiyun * before get-sensor will succeed.
35*4882a593Smuzhiyun */
36*4882a593Smuzhiyun rc = rtas_set_power_level(slot->power_domain, POWER_ON,
37*4882a593Smuzhiyun &setlevel);
38*4882a593Smuzhiyun if (rc < 0) {
39*4882a593Smuzhiyun dbg("%s: power on slot[%s] failed rc=%d.\n",
40*4882a593Smuzhiyun __func__, slot->name, rc);
41*4882a593Smuzhiyun } else {
42*4882a593Smuzhiyun rc = rtas_get_sensor(DR_ENTITY_SENSE,
43*4882a593Smuzhiyun slot->index, state);
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun } else if (rc == -ENODEV)
46*4882a593Smuzhiyun info("%s: slot is unusable\n", __func__);
47*4882a593Smuzhiyun else
48*4882a593Smuzhiyun err("%s failed to get sensor state\n", __func__);
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun return rc;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun /**
54*4882a593Smuzhiyun * rpaphp_enable_slot - record slot state, config pci device
55*4882a593Smuzhiyun * @slot: target &slot
56*4882a593Smuzhiyun *
57*4882a593Smuzhiyun * Initialize values in the slot structure to indicate if there is a pci card
58*4882a593Smuzhiyun * plugged into the slot. If the slot is not empty, run the pcibios routine
59*4882a593Smuzhiyun * to get pcibios stuff correctly set up.
60*4882a593Smuzhiyun */
rpaphp_enable_slot(struct slot * slot)61*4882a593Smuzhiyun int rpaphp_enable_slot(struct slot *slot)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun int rc, level, state;
64*4882a593Smuzhiyun struct pci_bus *bus;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun slot->state = EMPTY;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun /* Find out if the power is turned on for the slot */
69*4882a593Smuzhiyun rc = rtas_get_power_level(slot->power_domain, &level);
70*4882a593Smuzhiyun if (rc)
71*4882a593Smuzhiyun return rc;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun /* Figure out if there is an adapter in the slot */
74*4882a593Smuzhiyun rc = rpaphp_get_sensor_state(slot, &state);
75*4882a593Smuzhiyun if (rc)
76*4882a593Smuzhiyun return rc;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun bus = pci_find_bus_by_node(slot->dn);
79*4882a593Smuzhiyun if (!bus) {
80*4882a593Smuzhiyun err("%s: no pci_bus for dn %pOF\n", __func__, slot->dn);
81*4882a593Smuzhiyun return -EINVAL;
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun slot->bus = bus;
85*4882a593Smuzhiyun slot->pci_devs = &bus->devices;
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun /* if there's an adapter in the slot, go add the pci devices */
88*4882a593Smuzhiyun if (state == PRESENT) {
89*4882a593Smuzhiyun slot->state = NOT_CONFIGURED;
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun /* non-empty slot has to have child */
92*4882a593Smuzhiyun if (!slot->dn->child) {
93*4882a593Smuzhiyun err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
94*4882a593Smuzhiyun __func__, slot->name);
95*4882a593Smuzhiyun return -EINVAL;
96*4882a593Smuzhiyun }
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun if (list_empty(&bus->devices)) {
99*4882a593Smuzhiyun pseries_eeh_init_edev_recursive(PCI_DN(slot->dn));
100*4882a593Smuzhiyun pci_hp_add_devices(bus);
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun if (!list_empty(&bus->devices)) {
104*4882a593Smuzhiyun slot->state = CONFIGURED;
105*4882a593Smuzhiyun }
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun if (rpaphp_debug) {
108*4882a593Smuzhiyun struct pci_dev *dev;
109*4882a593Smuzhiyun dbg("%s: pci_devs of slot[%pOF]\n", __func__, slot->dn);
110*4882a593Smuzhiyun list_for_each_entry(dev, &bus->devices, bus_list)
111*4882a593Smuzhiyun dbg("\t%s\n", pci_name(dev));
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun }
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun return 0;
116*4882a593Smuzhiyun }
117