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