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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> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
eefa9cfc | 30 | #include <linux/module.h> |
c9ffa5a5 KK |
31 | #include "pciehp.h" |
32 | ||
33 | #define PCIEHP_DETECT_PCIE (0) | |
34 | #define PCIEHP_DETECT_ACPI (1) | |
e046cbd6 KK |
35 | #define PCIEHP_DETECT_AUTO (2) |
36 | #define PCIEHP_DETECT_DEFAULT PCIEHP_DETECT_AUTO | |
c9ffa5a5 | 37 | |
8720d27d KK |
38 | struct dummy_slot { |
39 | u32 number; | |
40 | struct list_head list; | |
41 | }; | |
42 | ||
c9ffa5a5 KK |
43 | static int slot_detection_mode; |
44 | static char *pciehp_detect_mode; | |
45 | module_param(pciehp_detect_mode, charp, 0444); | |
46 | MODULE_PARM_DESC(pciehp_detect_mode, | |
e046cbd6 KK |
47 | "Slot detection mode: pcie, acpi, auto\n" |
48 | " pcie - Use PCIe based slot detection\n" | |
49 | " acpi - Use ACPI for slot detection\n" | |
50 | " auto(default) - Auto select mode. Use acpi option if duplicate\n" | |
51 | " slot ids are found. Otherwise, use pcie option\n"); | |
c9ffa5a5 | 52 | |
c9ffa5a5 KK |
53 | int pciehp_acpi_slot_detection_check(struct pci_dev *dev) |
54 | { | |
55 | if (slot_detection_mode != PCIEHP_DETECT_ACPI) | |
56 | return 0; | |
7f538669 | 57 | if (acpi_pci_detect_ejectable(DEVICE_ACPI_HANDLE(&dev->dev))) |
c9ffa5a5 KK |
58 | return 0; |
59 | return -ENODEV; | |
60 | } | |
61 | ||
62 | static int __init parse_detect_mode(void) | |
63 | { | |
64 | if (!pciehp_detect_mode) | |
65 | return PCIEHP_DETECT_DEFAULT; | |
66 | if (!strcmp(pciehp_detect_mode, "pcie")) | |
67 | return PCIEHP_DETECT_PCIE; | |
68 | if (!strcmp(pciehp_detect_mode, "acpi")) | |
69 | return PCIEHP_DETECT_ACPI; | |
e046cbd6 KK |
70 | if (!strcmp(pciehp_detect_mode, "auto")) |
71 | return PCIEHP_DETECT_AUTO; | |
c9ffa5a5 KK |
72 | warn("bad specifier '%s' for pciehp_detect_mode. Use default\n", |
73 | pciehp_detect_mode); | |
74 | return PCIEHP_DETECT_DEFAULT; | |
75 | } | |
76 | ||
e046cbd6 KK |
77 | static int __initdata dup_slot_id; |
78 | static int __initdata acpi_slot_detected; | |
79 | static struct list_head __initdata dummy_slots = LIST_HEAD_INIT(dummy_slots); | |
80 | ||
81 | /* Dummy driver for dumplicate name detection */ | |
0516c8bc | 82 | static int __init dummy_probe(struct pcie_device *dev) |
e046cbd6 | 83 | { |
e046cbd6 | 84 | u32 slot_cap; |
7f538669 | 85 | acpi_handle handle; |
8720d27d | 86 | struct dummy_slot *slot, *tmp; |
e046cbd6 | 87 | struct pci_dev *pdev = dev->port; |
28eb5f27 | 88 | |
537a77e6 | 89 | pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &slot_cap); |
0b3e7388 JL |
90 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); |
91 | if (!slot) | |
92 | return -ENOMEM; | |
e046cbd6 | 93 | slot->number = slot_cap >> 19; |
8720d27d | 94 | list_for_each_entry(tmp, &dummy_slots, list) { |
e046cbd6 KK |
95 | if (tmp->number == slot->number) |
96 | dup_slot_id++; | |
97 | } | |
8720d27d | 98 | list_add_tail(&slot->list, &dummy_slots); |
7f538669 AC |
99 | handle = DEVICE_ACPI_HANDLE(&pdev->dev); |
100 | if (!acpi_slot_detected && acpi_pci_detect_ejectable(handle)) | |
e046cbd6 KK |
101 | acpi_slot_detected = 1; |
102 | return -ENODEV; /* dummy driver always returns error */ | |
103 | } | |
104 | ||
105 | static struct pcie_port_service_driver __initdata dummy_driver = { | |
106 | .name = "pciehp_dummy", | |
22106368 RW |
107 | .port_type = PCIE_ANY_PORT, |
108 | .service = PCIE_PORT_SERVICE_HP, | |
e046cbd6 KK |
109 | .probe = dummy_probe, |
110 | }; | |
111 | ||
112 | static int __init select_detection_mode(void) | |
113 | { | |
8720d27d | 114 | struct dummy_slot *slot, *tmp; |
994e0b2c RW |
115 | if (pcie_port_service_register(&dummy_driver)) |
116 | return PCIEHP_DETECT_ACPI; | |
e046cbd6 | 117 | pcie_port_service_unregister(&dummy_driver); |
8720d27d KK |
118 | list_for_each_entry_safe(slot, tmp, &dummy_slots, list) { |
119 | list_del(&slot->list); | |
e046cbd6 KK |
120 | kfree(slot); |
121 | } | |
122 | if (acpi_slot_detected && dup_slot_id) | |
123 | return PCIEHP_DETECT_ACPI; | |
124 | return PCIEHP_DETECT_PCIE; | |
125 | } | |
126 | ||
c9ffa5a5 KK |
127 | void __init pciehp_acpi_slot_detection_init(void) |
128 | { | |
129 | slot_detection_mode = parse_detect_mode(); | |
e046cbd6 KK |
130 | if (slot_detection_mode != PCIEHP_DETECT_AUTO) |
131 | goto out; | |
132 | slot_detection_mode = select_detection_mode(); | |
133 | out: | |
134 | if (slot_detection_mode == PCIEHP_DETECT_ACPI) | |
135 | info("Using ACPI for slot detection.\n"); | |
c9ffa5a5 | 136 | } |