1 files changed, 141 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/pciehp_acpi.c b/drivers/pci/hotplug/pciehp_acpi.c
new file mode 100644
index 000000000000..438d795f9fe3
--- /dev/null
+++ b/drivers/pci/hotplug/pciehp_acpi.c
@@ -0,0 +1,141 @@
+/*
+ * 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(dev->subordinate))
+                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 struct pcie_port_service_id __initdata port_pci_ids[] = {
+        {
+                .vendor = PCI_ANY_ID,
+                .device = PCI_ANY_ID,
+                .port_type = PCIE_ANY_PORT,
+                .service_type = PCIE_PORT_SERVICE_HP,
+                .driver_data =  0,
+        }, { /* end: all zeroes */ }
+};
+
+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,
+                              const struct pcie_port_service_id *id)
+{
+        int pos;
+        u32 slot_cap;
+        struct slot *slot, *tmp;
+        struct pci_dev *pdev = dev->port;
+        struct pci_bus *pbus = pdev->subordinate;
+        if (!(slot = kzalloc(sizeof(*slot), GFP_KERNEL)))
+                return -ENOMEM;
+        /* 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->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);
+        if (!acpi_slot_detected && acpi_pci_detect_ejectable(pbus))
+                acpi_slot_detected = 1;
+        return -ENODEV;         /* dummy driver always returns error */
+}
+
+static struct pcie_port_service_driver __initdata dummy_driver = {
+        .name           = "pciehp_dummy",
+        .id_table       = port_pci_ids,
+        .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");
+}