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c9ffa5a5 KK |
1 | /* |
2 | * ACPI related functions for PCI Express Hot Plug driver. | |
3 | * | |
4 | * Copyright (C) 2008 Kenji Kaneshige | |
5 | * Copyright (C) 2008 Fujitsu Limited. | |
6 | * | |
7 | * All rights reserved. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
17 | * NON INFRINGEMENT. See the GNU General Public License for more | |
18 | * details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/acpi.h> | |
e8c331e9 KK |
27 | #include <linux/pci.h> |
28 | #include <linux/pci_hotplug.h> | |
c9ffa5a5 KK |
29 | #include "pciehp.h" |
30 | ||
31 | #define PCIEHP_DETECT_PCIE (0) | |
32 | #define PCIEHP_DETECT_ACPI (1) | |
e046cbd6 KK |
33 | #define PCIEHP_DETECT_AUTO (2) |
34 | #define PCIEHP_DETECT_DEFAULT PCIEHP_DETECT_AUTO | |
c9ffa5a5 KK |
35 | |
36 | static int slot_detection_mode; | |
37 | static char *pciehp_detect_mode; | |
38 | module_param(pciehp_detect_mode, charp, 0444); | |
39 | MODULE_PARM_DESC(pciehp_detect_mode, | |
e046cbd6 KK |
40 | "Slot detection mode: pcie, acpi, auto\n" |
41 | " pcie - Use PCIe based slot detection\n" | |
42 | " acpi - Use ACPI for slot detection\n" | |
43 | " auto(default) - Auto select mode. Use acpi option if duplicate\n" | |
44 | " slot ids are found. Otherwise, use pcie option\n"); | |
c9ffa5a5 | 45 | |
c9ffa5a5 KK |
46 | int pciehp_acpi_slot_detection_check(struct pci_dev *dev) |
47 | { | |
48 | if (slot_detection_mode != PCIEHP_DETECT_ACPI) | |
49 | return 0; | |
e8c331e9 | 50 | if (acpi_pci_detect_ejectable(dev->subordinate)) |
c9ffa5a5 KK |
51 | return 0; |
52 | return -ENODEV; | |
53 | } | |
54 | ||
55 | static int __init parse_detect_mode(void) | |
56 | { | |
57 | if (!pciehp_detect_mode) | |
58 | return PCIEHP_DETECT_DEFAULT; | |
59 | if (!strcmp(pciehp_detect_mode, "pcie")) | |
60 | return PCIEHP_DETECT_PCIE; | |
61 | if (!strcmp(pciehp_detect_mode, "acpi")) | |
62 | return PCIEHP_DETECT_ACPI; | |
e046cbd6 KK |
63 | if (!strcmp(pciehp_detect_mode, "auto")) |
64 | return PCIEHP_DETECT_AUTO; | |
c9ffa5a5 KK |
65 | warn("bad specifier '%s' for pciehp_detect_mode. Use default\n", |
66 | pciehp_detect_mode); | |
67 | return PCIEHP_DETECT_DEFAULT; | |
68 | } | |
69 | ||
e046cbd6 KK |
70 | static int __initdata dup_slot_id; |
71 | static int __initdata acpi_slot_detected; | |
72 | static struct list_head __initdata dummy_slots = LIST_HEAD_INIT(dummy_slots); | |
73 | ||
74 | /* Dummy driver for dumplicate name detection */ | |
0516c8bc | 75 | static int __init dummy_probe(struct pcie_device *dev) |
e046cbd6 KK |
76 | { |
77 | int pos; | |
78 | u32 slot_cap; | |
79 | struct slot *slot, *tmp; | |
80 | struct pci_dev *pdev = dev->port; | |
e8c331e9 | 81 | struct pci_bus *pbus = pdev->subordinate; |
e046cbd6 KK |
82 | /* Note: pciehp_detect_mode != PCIEHP_DETECT_ACPI here */ |
83 | if (pciehp_get_hp_hw_control_from_firmware(pdev)) | |
84 | return -ENODEV; | |
85 | if (!(pos = pci_find_capability(pdev, PCI_CAP_ID_EXP))) | |
86 | return -ENODEV; | |
87 | pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, &slot_cap); | |
0b3e7388 JL |
88 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); |
89 | if (!slot) | |
90 | return -ENOMEM; | |
e046cbd6 KK |
91 | slot->number = slot_cap >> 19; |
92 | list_for_each_entry(tmp, &dummy_slots, slot_list) { | |
93 | if (tmp->number == slot->number) | |
94 | dup_slot_id++; | |
95 | } | |
96 | list_add_tail(&slot->slot_list, &dummy_slots); | |
e8c331e9 | 97 | if (!acpi_slot_detected && acpi_pci_detect_ejectable(pbus)) |
e046cbd6 KK |
98 | acpi_slot_detected = 1; |
99 | return -ENODEV; /* dummy driver always returns error */ | |
100 | } | |
101 | ||
102 | static struct pcie_port_service_driver __initdata dummy_driver = { | |
103 | .name = "pciehp_dummy", | |
22106368 RW |
104 | .port_type = PCIE_ANY_PORT, |
105 | .service = PCIE_PORT_SERVICE_HP, | |
e046cbd6 KK |
106 | .probe = dummy_probe, |
107 | }; | |
108 | ||
109 | static int __init select_detection_mode(void) | |
110 | { | |
111 | struct slot *slot, *tmp; | |
112 | pcie_port_service_register(&dummy_driver); | |
113 | pcie_port_service_unregister(&dummy_driver); | |
114 | list_for_each_entry_safe(slot, tmp, &dummy_slots, slot_list) { | |
115 | list_del(&slot->slot_list); | |
116 | kfree(slot); | |
117 | } | |
118 | if (acpi_slot_detected && dup_slot_id) | |
119 | return PCIEHP_DETECT_ACPI; | |
120 | return PCIEHP_DETECT_PCIE; | |
121 | } | |
122 | ||
c9ffa5a5 KK |
123 | void __init pciehp_acpi_slot_detection_init(void) |
124 | { | |
125 | slot_detection_mode = parse_detect_mode(); | |
e046cbd6 KK |
126 | if (slot_detection_mode != PCIEHP_DETECT_AUTO) |
127 | goto out; | |
128 | slot_detection_mode = select_detection_mode(); | |
129 | out: | |
130 | if (slot_detection_mode == PCIEHP_DETECT_ACPI) | |
131 | info("Using ACPI for slot detection.\n"); | |
c9ffa5a5 | 132 | } |