1 /*
2 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
3 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
4 *
5 * All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or (at
10 * your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
15 * NON INFRINGEMENT. See the GNU General Public License for more
16 * details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * Send feedback to <lxie@us.ibm.com>
23 *
24 */
25 #include <linux/pci.h>
26 #include <linux/string.h>
27
28 #include <asm/pci-bridge.h>
29 #include <asm/rtas.h>
30 #include <asm/machdep.h>
31
32 #include "../pci.h" /* for pci_add_new_bus */
33 #include "rpaphp.h"
34
rpaphp_get_sensor_state(struct slot * slot,int * state)35 int rpaphp_get_sensor_state(struct slot *slot, int *state)
36 {
37 int rc;
38 int setlevel;
39
40 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
41
42 if (rc < 0) {
43 if (rc == -EFAULT || rc == -EEXIST) {
44 dbg("%s: slot must be power up to get sensor-state\n",
45 __func__);
46
47 /* some slots have to be powered up
48 * before get-sensor will succeed.
49 */
50 rc = rtas_set_power_level(slot->power_domain, POWER_ON,
51 &setlevel);
52 if (rc < 0) {
53 dbg("%s: power on slot[%s] failed rc=%d.\n",
54 __func__, slot->name, rc);
55 } else {
56 rc = rtas_get_sensor(DR_ENTITY_SENSE,
57 slot->index, state);
58 }
59 } else if (rc == -ENODEV)
60 info("%s: slot is unusable\n", __func__);
61 else
62 err("%s failed to get sensor state\n", __func__);
63 }
64 return rc;
65 }
66
67 /**
68 * rpaphp_enable_slot - record slot state, config pci device
69 * @slot: target &slot
70 *
71 * Initialize values in the slot, and the hotplug_slot info
72 * structures to indicate if there is a pci card plugged into
73 * the slot. If the slot is not empty, run the pcibios routine
74 * to get pcibios stuff correctly set up.
75 */
rpaphp_enable_slot(struct slot * slot)76 int rpaphp_enable_slot(struct slot *slot)
77 {
78 int rc, level, state;
79 struct pci_bus *bus;
80 struct hotplug_slot_info *info = slot->hotplug_slot->info;
81
82 info->adapter_status = NOT_VALID;
83 slot->state = EMPTY;
84
85 /* Find out if the power is turned on for the slot */
86 rc = rtas_get_power_level(slot->power_domain, &level);
87 if (rc)
88 return rc;
89 info->power_status = level;
90
91 /* Figure out if there is an adapter in the slot */
92 rc = rpaphp_get_sensor_state(slot, &state);
93 if (rc)
94 return rc;
95
96 bus = pci_find_bus_by_node(slot->dn);
97 if (!bus) {
98 err("%s: no pci_bus for dn %s\n", __func__, slot->dn->full_name);
99 return -EINVAL;
100 }
101
102 info->adapter_status = EMPTY;
103 slot->bus = bus;
104 slot->pci_devs = &bus->devices;
105
106 /* if there's an adapter in the slot, go add the pci devices */
107 if (state == PRESENT) {
108 info->adapter_status = NOT_CONFIGURED;
109 slot->state = NOT_CONFIGURED;
110
111 /* non-empty slot has to have child */
112 if (!slot->dn->child) {
113 err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
114 __func__, slot->name);
115 return -EINVAL;
116 }
117
118 if (list_empty(&bus->devices))
119 pci_hp_add_devices(bus);
120
121 if (!list_empty(&bus->devices)) {
122 info->adapter_status = CONFIGURED;
123 slot->state = CONFIGURED;
124 }
125
126 if (rpaphp_debug) {
127 struct pci_dev *dev;
128 dbg("%s: pci_devs of slot[%s]\n", __func__, slot->dn->full_name);
129 list_for_each_entry(dev, &bus->devices, bus_list)
130 dbg("\t%s\n", pci_name(dev));
131 }
132 }
133
134 return 0;
135 }
136