Kenji Kaneshige | c9ffa5a | 2008-12-17 12:07:38 +0900 | [diff] [blame] | 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> |
Kenji Kaneshige | e8c331e | 2008-12-17 12:09:12 +0900 | [diff] [blame] | 27 | #include <linux/pci.h> |
| 28 | #include <linux/pci_hotplug.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 29 | #include <linux/slab.h> |
Paul Gortmaker | eefa9cf | 2011-05-27 09:42:30 -0400 | [diff] [blame] | 30 | #include <linux/module.h> |
Kenji Kaneshige | c9ffa5a | 2008-12-17 12:07:38 +0900 | [diff] [blame] | 31 | #include "pciehp.h" |
| 32 | |
| 33 | #define PCIEHP_DETECT_PCIE (0) |
| 34 | #define PCIEHP_DETECT_ACPI (1) |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 35 | #define PCIEHP_DETECT_AUTO (2) |
| 36 | #define PCIEHP_DETECT_DEFAULT PCIEHP_DETECT_AUTO |
Kenji Kaneshige | c9ffa5a | 2008-12-17 12:07:38 +0900 | [diff] [blame] | 37 | |
Kenji Kaneshige | 8720d27 | 2009-09-15 17:24:46 +0900 | [diff] [blame] | 38 | struct dummy_slot { |
| 39 | u32 number; |
| 40 | struct list_head list; |
| 41 | }; |
| 42 | |
Kenji Kaneshige | c9ffa5a | 2008-12-17 12:07:38 +0900 | [diff] [blame] | 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, |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 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"); |
Kenji Kaneshige | c9ffa5a | 2008-12-17 12:07:38 +0900 | [diff] [blame] | 52 | |
Kenji Kaneshige | c9ffa5a | 2008-12-17 12:07:38 +0900 | [diff] [blame] | 53 | int pciehp_acpi_slot_detection_check(struct pci_dev *dev) |
| 54 | { |
| 55 | if (slot_detection_mode != PCIEHP_DETECT_ACPI) |
| 56 | return 0; |
Rafael J. Wysocki | 3a83f99 | 2013-11-14 23:17:21 +0100 | [diff] [blame^] | 57 | if (acpi_pci_detect_ejectable(ACPI_HANDLE(&dev->dev))) |
Kenji Kaneshige | c9ffa5a | 2008-12-17 12:07:38 +0900 | [diff] [blame] | 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; |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 70 | if (!strcmp(pciehp_detect_mode, "auto")) |
| 71 | return PCIEHP_DETECT_AUTO; |
Kenji Kaneshige | c9ffa5a | 2008-12-17 12:07:38 +0900 | [diff] [blame] | 72 | warn("bad specifier '%s' for pciehp_detect_mode. Use default\n", |
| 73 | pciehp_detect_mode); |
| 74 | return PCIEHP_DETECT_DEFAULT; |
| 75 | } |
| 76 | |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 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 */ |
Rafael J. Wysocki | 0516c8b | 2009-01-13 14:44:19 +0100 | [diff] [blame] | 82 | static int __init dummy_probe(struct pcie_device *dev) |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 83 | { |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 84 | u32 slot_cap; |
Alex Chiang | 7f53866 | 2009-09-10 12:34:09 -0600 | [diff] [blame] | 85 | acpi_handle handle; |
Kenji Kaneshige | 8720d27 | 2009-09-15 17:24:46 +0900 | [diff] [blame] | 86 | struct dummy_slot *slot, *tmp; |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 87 | struct pci_dev *pdev = dev->port; |
Rafael J. Wysocki | 28eb5f2 | 2010-08-21 22:02:38 +0200 | [diff] [blame] | 88 | |
Jiang Liu | 537a77e | 2012-07-24 17:20:09 +0800 | [diff] [blame] | 89 | pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &slot_cap); |
Julia Lawall | 0b3e738 | 2009-02-08 22:45:24 +0100 | [diff] [blame] | 90 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); |
| 91 | if (!slot) |
| 92 | return -ENOMEM; |
Bjorn Helgaas | 545d7b7 | 2013-04-09 16:46:12 -0600 | [diff] [blame] | 93 | slot->number = (slot_cap & PCI_EXP_SLTCAP_PSN) >> 19; |
Kenji Kaneshige | 8720d27 | 2009-09-15 17:24:46 +0900 | [diff] [blame] | 94 | list_for_each_entry(tmp, &dummy_slots, list) { |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 95 | if (tmp->number == slot->number) |
| 96 | dup_slot_id++; |
| 97 | } |
Kenji Kaneshige | 8720d27 | 2009-09-15 17:24:46 +0900 | [diff] [blame] | 98 | list_add_tail(&slot->list, &dummy_slots); |
Rafael J. Wysocki | 3a83f99 | 2013-11-14 23:17:21 +0100 | [diff] [blame^] | 99 | handle = ACPI_HANDLE(&pdev->dev); |
Alex Chiang | 7f53866 | 2009-09-10 12:34:09 -0600 | [diff] [blame] | 100 | if (!acpi_slot_detected && acpi_pci_detect_ejectable(handle)) |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 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", |
Rafael J. Wysocki | 2210636 | 2009-01-13 14:46:46 +0100 | [diff] [blame] | 107 | .port_type = PCIE_ANY_PORT, |
| 108 | .service = PCIE_PORT_SERVICE_HP, |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 109 | .probe = dummy_probe, |
| 110 | }; |
| 111 | |
| 112 | static int __init select_detection_mode(void) |
| 113 | { |
Kenji Kaneshige | 8720d27 | 2009-09-15 17:24:46 +0900 | [diff] [blame] | 114 | struct dummy_slot *slot, *tmp; |
Rafael J. Wysocki | 994e0b2 | 2010-12-18 13:29:45 +0100 | [diff] [blame] | 115 | if (pcie_port_service_register(&dummy_driver)) |
| 116 | return PCIEHP_DETECT_ACPI; |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 117 | pcie_port_service_unregister(&dummy_driver); |
Kenji Kaneshige | 8720d27 | 2009-09-15 17:24:46 +0900 | [diff] [blame] | 118 | list_for_each_entry_safe(slot, tmp, &dummy_slots, list) { |
| 119 | list_del(&slot->list); |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 120 | kfree(slot); |
| 121 | } |
| 122 | if (acpi_slot_detected && dup_slot_id) |
| 123 | return PCIEHP_DETECT_ACPI; |
| 124 | return PCIEHP_DETECT_PCIE; |
| 125 | } |
| 126 | |
Kenji Kaneshige | c9ffa5a | 2008-12-17 12:07:38 +0900 | [diff] [blame] | 127 | void __init pciehp_acpi_slot_detection_init(void) |
| 128 | { |
| 129 | slot_detection_mode = parse_detect_mode(); |
Kenji Kaneshige | e046cbd | 2008-12-17 12:08:15 +0900 | [diff] [blame] | 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"); |
Kenji Kaneshige | c9ffa5a | 2008-12-17 12:07:38 +0900 | [diff] [blame] | 136 | } |