517 lines
14 KiB
C
517 lines
14 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/pci.h>
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#include <linux/workqueue.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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#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 int get_address (struct hotplug_slot *slot, u32 *value);
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static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
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static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
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static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
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.owner = THIS_MODULE,
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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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.get_address = get_address,
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.get_max_bus_speed = get_max_bus_speed,
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.get_cur_bus_speed = get_cur_bus_speed,
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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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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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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 void make_slot_name(struct slot *slot)
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{
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snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
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slot->bus, slot->number);
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}
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static int
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shpchprm_get_physical_slot_number(struct controller *ctrl, u32 *sun,
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u8 busnum, u8 devnum)
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{
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int offset = devnum - ctrl->slot_device_offset;
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dbg("%s: ctrl->slot_num_inc %d, offset %d\n", __FUNCTION__,
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ctrl->slot_num_inc, offset);
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*sun = (u8) (ctrl->first_slot + ctrl->slot_num_inc *offset);
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return 0;
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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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int retval = -ENOMEM;
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int i;
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u32 sun;
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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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hotplug_slot->name = slot->name;
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slot->hp_slot = i;
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slot->ctrl = ctrl;
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slot->bus = ctrl->slot_bus;
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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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mutex_init(&slot->lock);
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if (shpchprm_get_physical_slot_number(ctrl, &sun,
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slot->bus, slot->device))
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goto error_info;
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slot->number = sun;
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INIT_WORK(&slot->work, queue_pushbutton_work, slot);
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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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make_slot_name(slot);
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hotplug_slot->ops = &shpchp_hotplug_slot_ops;
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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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dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
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"slot_device_offset=%x\n", slot->bus, slot->device,
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slot->hp_slot, slot->number, ctrl->slot_device_offset);
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retval = pci_hp_register(slot->hotplug_slot);
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if (retval) {
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err("pci_hp_register failed with error %d\n", retval);
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goto error_info;
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}
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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_scheduled_work();
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flush_workqueue(shpchp_wq);
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pci_hp_deregister(slot->hotplug_slot);
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}
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}
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static int get_ctlr_slot_config(struct controller *ctrl)
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{
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int num_ctlr_slots;
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int first_device_num;
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int physical_slot_num;
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int updown;
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int rc;
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int flags;
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rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots,
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&first_device_num, &physical_slot_num,
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&updown, &flags);
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if (rc) {
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err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n",
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__FUNCTION__, ctrl->bus, ctrl->device);
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return -1;
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}
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ctrl->num_slots = num_ctlr_slots;
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ctrl->slot_device_offset = first_device_num;
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ctrl->first_slot = physical_slot_num;
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ctrl->slot_num_inc = updown; /* either -1 or 1 */
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dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d "
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"(%x:%x)\n", __FUNCTION__, num_ctlr_slots, first_device_num,
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physical_slot_num, updown, ctrl->bus, ctrl->device);
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return 0;
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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, __FUNCTION__);
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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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, __FUNCTION__);
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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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, __FUNCTION__);
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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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, __FUNCTION__);
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int retval;
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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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, __FUNCTION__);
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int retval;
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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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, __FUNCTION__);
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int retval;
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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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, __FUNCTION__);
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int retval;
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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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 get_address (struct hotplug_slot *hotplug_slot, u32 *value)
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{
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struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
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struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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*value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
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return 0;
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}
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static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
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{
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struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
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int retval;
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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retval = slot->hpc_ops->get_max_bus_speed(slot, value);
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if (retval < 0)
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*value = PCI_SPEED_UNKNOWN;
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return 0;
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}
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static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
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{
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struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
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int retval;
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
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if (retval < 0)
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*value = PCI_SPEED_UNKNOWN;
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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 1;
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return 0;
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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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struct slot *t_slot;
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int first_device_num; /* first PCI device number */
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int num_ctlr_slots; /* number of slots implemented */
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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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err("%s : out of memory\n", __FUNCTION__);
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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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dbg("%s: controller initialization failed\n",
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SHPC_MODULE_NAME);
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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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ctrl->bus = pdev->bus->number;
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ctrl->slot_bus = pdev->subordinate->number;
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ctrl->device = PCI_SLOT(pdev->devfn);
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ctrl->function = PCI_FUNC(pdev->devfn);
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dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n",
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ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
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/*
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* Save configuration headers for this and subordinate PCI buses
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*/
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rc = get_ctlr_slot_config(ctrl);
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if (rc) {
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err(msg_initialization_err, rc);
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goto err_out_release_ctlr;
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}
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first_device_num = ctrl->slot_device_offset;
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num_ctlr_slots = ctrl->num_slots;
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ctrl->add_support = 1;
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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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err(msg_initialization_err, 6);
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goto err_out_release_ctlr;
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}
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/* Now hpc_functions (slot->hpc_ops->functions) are ready */
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t_slot = shpchp_find_slot(ctrl, first_device_num);
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/* Check for operation bus speed */
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rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed);
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dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot);
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if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) {
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err(SHPC_MODULE_NAME ": Can't get current bus speed. "
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"Set to 33MHz PCI.\n");
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ctrl->speed = PCI_SPEED_33MHz;
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}
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shpchp_create_ctrl_files(ctrl);
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return 0;
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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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#ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE
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shpchp_poll_mode = 1;
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#endif
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shpchp_wq = create_singlethread_workqueue("shpchpd");
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if (!shpchp_wq)
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return -ENOMEM;
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retval = pci_register_driver(&shpc_driver);
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dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval);
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info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
|
|
if (retval) {
|
|
destroy_workqueue(shpchp_wq);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static void __exit shpcd_cleanup(void)
|
|
{
|
|
dbg("unload_shpchpd()\n");
|
|
pci_unregister_driver(&shpc_driver);
|
|
destroy_workqueue(shpchp_wq);
|
|
info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
|
|
}
|
|
|
|
module_init(shpcd_init);
|
|
module_exit(shpcd_cleanup);
|