// SPDX-License-Identifier: GPL-2.0+ /* * Standard Hot Plug Controller Driver * * Copyright (C) 1995,2001 Compaq Computer Corporation * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2001 IBM Corp. * Copyright (C) 2003-2004 Intel Corporation * * All rights reserved. * * Send feedback to , * */ #include #include #include #include #include #include #include "shpchp.h" /* Global variables */ bool shpchp_debug; bool shpchp_poll_mode; int shpchp_poll_time; #define DRIVER_VERSION "0.4" #define DRIVER_AUTHOR "Dan Zink , Greg Kroah-Hartman , Dely Sy " #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver" MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); module_param(shpchp_debug, bool, 0644); module_param(shpchp_poll_mode, bool, 0644); module_param(shpchp_poll_time, int, 0644); MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not"); MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not"); MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds"); #define SHPC_MODULE_NAME "shpchp" static int set_attention_status(struct hotplug_slot *slot, u8 value); static int enable_slot(struct hotplug_slot *slot); static int disable_slot(struct hotplug_slot *slot); static int get_power_status(struct hotplug_slot *slot, u8 *value); static int get_attention_status(struct hotplug_slot *slot, u8 *value); static int get_latch_status(struct hotplug_slot *slot, u8 *value); static int get_adapter_status(struct hotplug_slot *slot, u8 *value); static const struct hotplug_slot_ops shpchp_hotplug_slot_ops = { .set_attention_status = set_attention_status, .enable_slot = enable_slot, .disable_slot = disable_slot, .get_power_status = get_power_status, .get_attention_status = get_attention_status, .get_latch_status = get_latch_status, .get_adapter_status = get_adapter_status, }; static int init_slots(struct controller *ctrl) { struct slot *slot; struct hotplug_slot *hotplug_slot; char name[SLOT_NAME_SIZE]; int retval; int i; for (i = 0; i < ctrl->num_slots; i++) { slot = kzalloc(sizeof(*slot), GFP_KERNEL); if (!slot) { retval = -ENOMEM; goto error; } hotplug_slot = &slot->hotplug_slot; slot->hp_slot = i; slot->ctrl = ctrl; slot->bus = ctrl->pci_dev->subordinate->number; slot->device = ctrl->slot_device_offset + i; slot->hpc_ops = ctrl->hpc_ops; slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i); slot->wq = alloc_workqueue("shpchp-%d", 0, 0, slot->number); if (!slot->wq) { retval = -ENOMEM; goto error_slot; } mutex_init(&slot->lock); INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work); /* register this slot with the hotplug pci core */ snprintf(name, SLOT_NAME_SIZE, "%d", slot->number); hotplug_slot->ops = &shpchp_hotplug_slot_ops; ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x hp_slot=%x sun=%x slot_device_offset=%x\n", pci_domain_nr(ctrl->pci_dev->subordinate), slot->bus, slot->device, slot->hp_slot, slot->number, ctrl->slot_device_offset); retval = pci_hp_register(hotplug_slot, ctrl->pci_dev->subordinate, slot->device, name); if (retval) { ctrl_err(ctrl, "pci_hp_register failed with error %d\n", retval); goto error_slotwq; } get_power_status(hotplug_slot, &slot->pwr_save); get_attention_status(hotplug_slot, &slot->attention_save); get_latch_status(hotplug_slot, &slot->latch_save); get_adapter_status(hotplug_slot, &slot->presence_save); list_add(&slot->slot_list, &ctrl->slot_list); } return 0; error_slotwq: destroy_workqueue(slot->wq); error_slot: kfree(slot); error: return retval; } void cleanup_slots(struct controller *ctrl) { struct slot *slot, *next; list_for_each_entry_safe(slot, next, &ctrl->slot_list, slot_list) { list_del(&slot->slot_list); cancel_delayed_work(&slot->work); destroy_workqueue(slot->wq); pci_hp_deregister(&slot->hotplug_slot); kfree(slot); } } /* * set_attention_status - Turns the Amber LED for a slot on, off or blink */ static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) { struct slot *slot = get_slot(hotplug_slot); ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", __func__, slot_name(slot)); slot->attention_save = status; slot->hpc_ops->set_attention_status(slot, status); return 0; } static int enable_slot(struct hotplug_slot *hotplug_slot) { struct slot *slot = get_slot(hotplug_slot); ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", __func__, slot_name(slot)); return shpchp_sysfs_enable_slot(slot); } static int disable_slot(struct hotplug_slot *hotplug_slot) { struct slot *slot = get_slot(hotplug_slot); ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", __func__, slot_name(slot)); return shpchp_sysfs_disable_slot(slot); } static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct slot *slot = get_slot(hotplug_slot); int retval; ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", __func__, slot_name(slot)); retval = slot->hpc_ops->get_power_status(slot, value); if (retval < 0) *value = slot->pwr_save; return 0; } static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct slot *slot = get_slot(hotplug_slot); int retval; ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", __func__, slot_name(slot)); retval = slot->hpc_ops->get_attention_status(slot, value); if (retval < 0) *value = slot->attention_save; return 0; } static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct slot *slot = get_slot(hotplug_slot); int retval; ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", __func__, slot_name(slot)); retval = slot->hpc_ops->get_latch_status(slot, value); if (retval < 0) *value = slot->latch_save; return 0; } static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct slot *slot = get_slot(hotplug_slot); int retval; ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", __func__, slot_name(slot)); retval = slot->hpc_ops->get_adapter_status(slot, value); if (retval < 0) *value = slot->presence_save; return 0; } static bool shpc_capable(struct pci_dev *bridge) { /* * It is assumed that AMD GOLAM chips support SHPC but they do not * have SHPC capability. */ if (bridge->vendor == PCI_VENDOR_ID_AMD && bridge->device == PCI_DEVICE_ID_AMD_GOLAM_7450) return true; if (pci_find_capability(bridge, PCI_CAP_ID_SHPC)) return true; return false; } static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { int rc; struct controller *ctrl; if (!shpc_capable(pdev)) return -ENODEV; if (acpi_get_hp_hw_control_from_firmware(pdev)) return -ENODEV; ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); if (!ctrl) goto err_out_none; INIT_LIST_HEAD(&ctrl->slot_list); rc = shpc_init(ctrl, pdev); if (rc) { ctrl_dbg(ctrl, "Controller initialization failed\n"); goto err_out_free_ctrl; } pci_set_drvdata(pdev, ctrl); /* Setup the slot information structures */ rc = init_slots(ctrl); if (rc) { ctrl_err(ctrl, "Slot initialization failed\n"); goto err_out_release_ctlr; } rc = shpchp_create_ctrl_files(ctrl); if (rc) goto err_cleanup_slots; pdev->shpc_managed = 1; return 0; err_cleanup_slots: cleanup_slots(ctrl); err_out_release_ctlr: ctrl->hpc_ops->release_ctlr(ctrl); err_out_free_ctrl: kfree(ctrl); err_out_none: return -ENODEV; } static void shpc_remove(struct pci_dev *dev) { struct controller *ctrl = pci_get_drvdata(dev); dev->shpc_managed = 0; shpchp_remove_ctrl_files(ctrl); ctrl->hpc_ops->release_ctlr(ctrl); kfree(ctrl); } static const struct pci_device_id shpcd_pci_tbl[] = { {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, { /* end: all zeroes */ } }; MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); static struct pci_driver shpc_driver = { .name = SHPC_MODULE_NAME, .id_table = shpcd_pci_tbl, .probe = shpc_probe, .remove = shpc_remove, }; static int __init shpcd_init(void) { int retval; retval = pci_register_driver(&shpc_driver); dbg("%s: pci_register_driver = %d\n", __func__, retval); info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); return retval; } static void __exit shpcd_cleanup(void) { dbg("unload_shpchpd()\n"); pci_unregister_driver(&shpc_driver); info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); } module_init(shpcd_init); module_exit(shpcd_cleanup);