394 lines
10 KiB
C
394 lines
10 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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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int shpchp_debug;
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int shpchp_poll_mode;
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int shpchp_poll_time;
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struct workqueue_struct *shpchp_wq;
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struct workqueue_struct *shpchp_ordered_wq;
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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 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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/**
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* release_slot - free up the memory used by a slot
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* @hotplug_slot: slot to free
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*/
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static void release_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = hotplug_slot->private;
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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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kfree(slot->hotplug_slot->info);
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kfree(slot->hotplug_slot);
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kfree(slot);
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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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struct hotplug_slot_info *info;
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char name[SLOT_NAME_SIZE];
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int retval = -ENOMEM;
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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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goto error;
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hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
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if (!hotplug_slot)
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goto error_slot;
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slot->hotplug_slot = hotplug_slot;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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goto error_hpslot;
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hotplug_slot->info = info;
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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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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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hotplug_slot->private = slot;
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hotplug_slot->release = &release_slot;
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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 "
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"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(slot->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_info;
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}
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get_power_status(hotplug_slot, &info->power_status);
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get_attention_status(hotplug_slot, &info->attention_status);
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get_latch_status(hotplug_slot, &info->latch_status);
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get_adapter_status(hotplug_slot, &info->adapter_status);
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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_info:
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kfree(info);
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error_hpslot:
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kfree(hotplug_slot);
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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 list_head *tmp;
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struct list_head *next;
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struct slot *slot;
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list_for_each_safe(tmp, next, &ctrl->slot_list) {
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slot = list_entry(tmp, struct slot, slot_list);
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list_del(&slot->slot_list);
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cancel_delayed_work(&slot->work);
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flush_workqueue(shpchp_wq);
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flush_workqueue(shpchp_ordered_wq);
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pci_hp_deregister(slot->hotplug_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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hotplug_slot->info->attention_status = 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 = hotplug_slot->info->power_status;
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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 = hotplug_slot->info->attention_status;
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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 = hotplug_slot->info->latch_status;
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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 = hotplug_slot->info->adapter_status;
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return 0;
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}
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static int is_shpc_capable(struct pci_dev *dev)
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{
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if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
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PCI_DEVICE_ID_AMD_GOLAM_7450))
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return 1;
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if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
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return 0;
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if (get_hp_hw_control_from_firmware(dev))
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return 0;
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return 1;
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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 (!is_shpc_capable(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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dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
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goto err_out_none;
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}
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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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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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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 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 = 0;
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shpchp_wq = alloc_ordered_workqueue("shpchp", 0);
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if (!shpchp_wq)
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return -ENOMEM;
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shpchp_ordered_wq = alloc_ordered_workqueue("shpchp_ordered", 0);
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if (!shpchp_ordered_wq) {
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destroy_workqueue(shpchp_wq);
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return -ENOMEM;
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}
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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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if (retval) {
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destroy_workqueue(shpchp_ordered_wq);
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destroy_workqueue(shpchp_wq);
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}
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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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destroy_workqueue(shpchp_ordered_wq);
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destroy_workqueue(shpchp_wq);
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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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