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