mirror of https://gitee.com/openkylin/linux.git
138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
/*
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* ACPI related functions for PCI Express Hot Plug driver.
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*
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* Copyright (C) 2008 Kenji Kaneshige
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* Copyright (C) 2008 Fujitsu Limited.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/acpi.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include "pciehp.h"
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#define PCIEHP_DETECT_PCIE (0)
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#define PCIEHP_DETECT_ACPI (1)
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#define PCIEHP_DETECT_AUTO (2)
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#define PCIEHP_DETECT_DEFAULT PCIEHP_DETECT_AUTO
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struct dummy_slot {
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u32 number;
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struct list_head list;
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};
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static int slot_detection_mode;
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static char *pciehp_detect_mode;
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module_param(pciehp_detect_mode, charp, 0444);
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MODULE_PARM_DESC(pciehp_detect_mode,
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"Slot detection mode: pcie, acpi, auto\n"
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" pcie - Use PCIe based slot detection\n"
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" acpi - Use ACPI for slot detection\n"
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" auto(default) - Auto select mode. Use acpi option if duplicate\n"
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" slot ids are found. Otherwise, use pcie option\n");
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int pciehp_acpi_slot_detection_check(struct pci_dev *dev)
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{
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if (slot_detection_mode != PCIEHP_DETECT_ACPI)
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return 0;
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if (acpi_pci_detect_ejectable(ACPI_HANDLE(&dev->dev)))
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return 0;
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return -ENODEV;
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}
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static int __init parse_detect_mode(void)
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{
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if (!pciehp_detect_mode)
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return PCIEHP_DETECT_DEFAULT;
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if (!strcmp(pciehp_detect_mode, "pcie"))
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return PCIEHP_DETECT_PCIE;
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if (!strcmp(pciehp_detect_mode, "acpi"))
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return PCIEHP_DETECT_ACPI;
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if (!strcmp(pciehp_detect_mode, "auto"))
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return PCIEHP_DETECT_AUTO;
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warn("bad specifier '%s' for pciehp_detect_mode. Use default\n",
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pciehp_detect_mode);
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return PCIEHP_DETECT_DEFAULT;
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}
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static int __initdata dup_slot_id;
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static int __initdata acpi_slot_detected;
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static struct list_head __initdata dummy_slots = LIST_HEAD_INIT(dummy_slots);
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/* Dummy driver for duplicate name detection */
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static int __init dummy_probe(struct pcie_device *dev)
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{
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u32 slot_cap;
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acpi_handle handle;
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struct dummy_slot *slot, *tmp;
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struct pci_dev *pdev = dev->port;
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pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &slot_cap);
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slot = kzalloc(sizeof(*slot), GFP_KERNEL);
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if (!slot)
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return -ENOMEM;
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slot->number = (slot_cap & PCI_EXP_SLTCAP_PSN) >> 19;
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list_for_each_entry(tmp, &dummy_slots, list) {
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if (tmp->number == slot->number)
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dup_slot_id++;
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}
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list_add_tail(&slot->list, &dummy_slots);
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handle = ACPI_HANDLE(&pdev->dev);
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if (!acpi_slot_detected && acpi_pci_detect_ejectable(handle))
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acpi_slot_detected = 1;
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return -ENODEV; /* dummy driver always returns error */
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}
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static struct pcie_port_service_driver __initdata dummy_driver = {
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.name = "pciehp_dummy",
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.port_type = PCIE_ANY_PORT,
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.service = PCIE_PORT_SERVICE_HP,
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.probe = dummy_probe,
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};
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static int __init select_detection_mode(void)
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{
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struct dummy_slot *slot, *tmp;
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if (pcie_port_service_register(&dummy_driver))
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return PCIEHP_DETECT_ACPI;
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pcie_port_service_unregister(&dummy_driver);
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list_for_each_entry_safe(slot, tmp, &dummy_slots, list) {
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list_del(&slot->list);
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kfree(slot);
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}
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if (acpi_slot_detected && dup_slot_id)
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return PCIEHP_DETECT_ACPI;
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return PCIEHP_DETECT_PCIE;
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}
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void __init pciehp_acpi_slot_detection_init(void)
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{
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slot_detection_mode = parse_detect_mode();
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if (slot_detection_mode != PCIEHP_DETECT_AUTO)
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goto out;
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slot_detection_mode = select_detection_mode();
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out:
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if (slot_detection_mode == PCIEHP_DETECT_ACPI)
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info("Using ACPI for slot detection.\n");
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}
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