| // 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 <greg@kroah.com>, <kristen.c.accardi@intel.com> |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/kernel.h> |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/pci.h> |
| #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 <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>" |
| #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); |
