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1da177e4 LT |
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> | |
4e57b681 TS |
26 | #include <linux/string.h> |
27 | ||
1da177e4 LT |
28 | #include <asm/pci-bridge.h> |
29 | #include <asm/rtas.h> | |
30 | #include <asm/machdep.h> | |
1da177e4 | 31 | |
4e57b681 | 32 | #include "../pci.h" /* for pci_add_new_bus */ |
1da177e4 LT |
33 | #include "rpaphp.h" |
34 | ||
e06b80b7 | 35 | int rpaphp_get_sensor_state(struct slot *slot, int *state) |
1da177e4 LT |
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", | |
66bef8c0 | 45 | __func__); |
1da177e4 | 46 | |
f7625980 | 47 | /* some slots have to be powered up |
1da177e4 LT |
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", | |
66bef8c0 | 54 | __func__, slot->name, rc); |
1da177e4 LT |
55 | } else { |
56 | rc = rtas_get_sensor(DR_ENTITY_SENSE, | |
57 | slot->index, state); | |
58 | } | |
59 | } else if (rc == -ENODEV) | |
66bef8c0 | 60 | info("%s: slot is unusable\n", __func__); |
1da177e4 | 61 | else |
66bef8c0 | 62 | err("%s failed to get sensor state\n", __func__); |
1da177e4 LT |
63 | } |
64 | return rc; | |
65 | } | |
66 | ||
fea54b8c LV |
67 | /** |
68 | * rpaphp_enable_slot - record slot state, config pci device | |
26e6c66e | 69 | * @slot: target &slot |
fea54b8c LV |
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 | */ | |
76 | int rpaphp_enable_slot(struct slot *slot) | |
1da177e4 | 77 | { |
bf0af511 LV |
78 | int rc, level, state; |
79 | struct pci_bus *bus; | |
517d5a04 LV |
80 | struct hotplug_slot_info *info = slot->hotplug_slot->info; |
81 | ||
03a66755 LV |
82 | info->adapter_status = NOT_VALID; |
83 | slot->state = EMPTY; | |
84 | ||
bf0af511 | 85 | /* Find out if the power is turned on for the slot */ |
427310ff LV |
86 | rc = rtas_get_power_level(slot->power_domain, &level); |
87 | if (rc) | |
88 | return rc; | |
89 | info->power_status = level; | |
90 | ||
bf0af511 | 91 | /* Figure out if there is an adapter in the slot */ |
bf0af511 LV |
92 | rc = rpaphp_get_sensor_state(slot, &state); |
93 | if (rc) | |
94 | return rc; | |
517d5a04 | 95 | |
03a66755 LV |
96 | bus = pcibios_find_pci_bus(slot->dn); |
97 | if (!bus) { | |
66bef8c0 | 98 | err("%s: no pci_bus for dn %s\n", __func__, slot->dn->full_name); |
03a66755 | 99 | return -EINVAL; |
517d5a04 | 100 | } |
1da177e4 | 101 | |
03a66755 LV |
102 | info->adapter_status = EMPTY; |
103 | slot->bus = bus; | |
104 | slot->pci_devs = &bus->devices; | |
03a66755 LV |
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", | |
66bef8c0 | 114 | __func__, slot->name); |
03a66755 LV |
115 | return -EINVAL; |
116 | } | |
117 | ||
118 | if (list_empty(&bus->devices)) | |
119 | pcibios_add_pci_devices(bus); | |
120 | ||
03a66755 LV |
121 | if (!list_empty(&bus->devices)) { |
122 | info->adapter_status = CONFIGURED; | |
123 | slot->state = CONFIGURED; | |
124 | } | |
307ff12e | 125 | |
5d9bc1fa | 126 | if (rpaphp_debug) { |
307ff12e | 127 | struct pci_dev *dev; |
66bef8c0 | 128 | dbg("%s: pci_devs of slot[%s]\n", __func__, slot->dn->full_name); |
ff3ce480 | 129 | list_for_each_entry(dev, &bus->devices, bus_list) |
307ff12e LV |
130 | dbg("\t%s\n", pci_name(dev)); |
131 | } | |
03a66755 | 132 | } |
517d5a04 | 133 | |
6f79eb74 | 134 | return 0; |
1da177e4 | 135 | } |