564 lines
15 KiB
C
564 lines
15 KiB
C
/*
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* PCI Express 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 "pciehp.h"
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#include <linux/interrupt.h>
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#include <linux/time.h>
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/* Global variables */
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int pciehp_debug;
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int pciehp_poll_mode;
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int pciehp_poll_time;
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int pciehp_force;
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struct workqueue_struct *pciehp_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 "PCI Express Hot Plug 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(pciehp_debug, bool, 0644);
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module_param(pciehp_poll_mode, bool, 0644);
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module_param(pciehp_poll_time, int, 0644);
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module_param(pciehp_force, bool, 0644);
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MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
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MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
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MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
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MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
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#define PCIE_MODULE_NAME "pciehp"
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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 pciehp_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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* Check the status of the Electro Mechanical Interlock (EMI)
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*/
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static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = hotplug_slot->private;
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return (slot->hpc_ops->get_emi_status(slot, value));
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}
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/*
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* sysfs interface for the Electro Mechanical Interlock (EMI)
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* 1 == locked, 0 == unlocked
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*/
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static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf)
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{
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int retval;
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u8 value;
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retval = get_lock_status(slot, &value);
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if (retval)
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goto lock_read_exit;
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retval = sprintf (buf, "%d\n", value);
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lock_read_exit:
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return retval;
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}
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/*
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* Change the status of the Electro Mechanical Interlock (EMI)
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* This is a toggle - in addition there must be at least 1 second
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* in between toggles.
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*/
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static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
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{
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struct slot *slot = hotplug_slot->private;
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int retval;
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u8 value;
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mutex_lock(&slot->ctrl->crit_sect);
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/* has it been >1 sec since our last toggle? */
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if ((get_seconds() - slot->last_emi_toggle) < 1)
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return -EINVAL;
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/* see what our current state is */
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retval = get_lock_status(hotplug_slot, &value);
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if (retval || (value == status))
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goto set_lock_exit;
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slot->hpc_ops->toggle_emi(slot);
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set_lock_exit:
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mutex_unlock(&slot->ctrl->crit_sect);
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return 0;
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}
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/*
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* sysfs interface which allows the user to toggle the Electro Mechanical
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* Interlock. Valid values are either 0 or 1. 0 == unlock, 1 == lock
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*/
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static ssize_t lock_write_file(struct hotplug_slot *slot, const char *buf,
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size_t count)
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{
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unsigned long llock;
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u8 lock;
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int retval = 0;
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llock = simple_strtoul(buf, NULL, 10);
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lock = (u8)(llock & 0xff);
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switch (lock) {
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case 0:
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case 1:
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retval = set_lock_status(slot, lock);
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break;
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default:
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err ("%d is an invalid lock value\n", lock);
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retval = -EINVAL;
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}
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if (retval)
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return retval;
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return count;
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}
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static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
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.attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR},
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.show = lock_read_file,
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.store = lock_write_file
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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 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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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->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;
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mutex_init(&slot->lock);
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INIT_DELAYED_WORK(&slot->work, pciehp_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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make_slot_name(slot);
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hotplug_slot->ops = &pciehp_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(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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/* create additional sysfs entries */
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if (EMI(ctrl->ctrlcap)) {
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retval = sysfs_create_file(&hotplug_slot->kobj,
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&hotplug_slot_attr_lock.attr);
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if (retval) {
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pci_hp_deregister(hotplug_slot);
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err("cannot create additional sysfs entries\n");
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goto error_info;
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}
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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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static 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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if (EMI(ctrl->ctrlcap))
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sysfs_remove_file(&slot->hotplug_slot->kobj,
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&hotplug_slot_attr_lock.attr);
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cancel_delayed_work(&slot->work);
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flush_scheduled_work();
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flush_workqueue(pciehp_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 = hotplug_slot->private;
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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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if (ATTN_LED(slot->ctrl->ctrlcap))
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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 = hotplug_slot->private;
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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return pciehp_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 = hotplug_slot->private;
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dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
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return pciehp_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 = hotplug_slot->private;
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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 = hotplug_slot->private;
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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 = hotplug_slot->private;
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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 = hotplug_slot->private;
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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 = hotplug_slot->private;
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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 = hotplug_slot->private;
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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 = hotplug_slot->private;
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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 pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
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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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u8 value;
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struct pci_dev *pdev;
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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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pdev = dev->port;
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ctrl->pci_dev = pdev;
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rc = pcie_init(ctrl, dev);
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if (rc) {
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dbg("%s: controller initialization failed\n", PCIE_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; /* ctrl bus */
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ctrl->slot_bus = pdev->subordinate->number; /* bus controlled by this HPC */
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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("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", __FUNCTION__,
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ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
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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("%s: slot initialization failed\n", PCIE_MODULE_NAME);
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goto err_out_release_ctlr;
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}
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t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
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t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
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if ((POWER_CTRL(ctrl->ctrlcap)) && !value) {
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rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
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if (rc)
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goto err_out_free_ctrl_slot;
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}
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return 0;
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err_out_free_ctrl_slot:
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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 pciehp_remove (struct pcie_device *dev)
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{
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struct pci_dev *pdev = dev->port;
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struct controller *ctrl = pci_get_drvdata(pdev);
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cleanup_slots(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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#ifdef CONFIG_PM
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static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
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{
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printk("%s ENTRY\n", __FUNCTION__);
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return 0;
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}
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static int pciehp_resume (struct pcie_device *dev)
|
|
{
|
|
printk("%s ENTRY\n", __FUNCTION__);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static struct pcie_port_service_id port_pci_ids[] = { {
|
|
.vendor = PCI_ANY_ID,
|
|
.device = PCI_ANY_ID,
|
|
.port_type = PCIE_ANY_PORT,
|
|
.service_type = PCIE_PORT_SERVICE_HP,
|
|
.driver_data = 0,
|
|
}, { /* end: all zeroes */ }
|
|
};
|
|
static const char device_name[] = "hpdriver";
|
|
|
|
static struct pcie_port_service_driver hpdriver_portdrv = {
|
|
.name = (char *)device_name,
|
|
.id_table = &port_pci_ids[0],
|
|
|
|
.probe = pciehp_probe,
|
|
.remove = pciehp_remove,
|
|
|
|
#ifdef CONFIG_PM
|
|
.suspend = pciehp_suspend,
|
|
.resume = pciehp_resume,
|
|
#endif /* PM */
|
|
};
|
|
|
|
static int __init pcied_init(void)
|
|
{
|
|
int retval = 0;
|
|
|
|
#ifdef CONFIG_HOTPLUG_PCI_PCIE_POLL_EVENT_MODE
|
|
pciehp_poll_mode = 1;
|
|
#endif
|
|
|
|
retval = pcie_port_service_register(&hpdriver_portdrv);
|
|
dbg("pcie_port_service_register = %d\n", retval);
|
|
info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
|
|
if (retval)
|
|
dbg("%s: Failure to register service\n", __FUNCTION__);
|
|
return retval;
|
|
}
|
|
|
|
static void __exit pcied_cleanup(void)
|
|
{
|
|
dbg("unload_pciehpd()\n");
|
|
pcie_port_service_unregister(&hpdriver_portdrv);
|
|
info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
|
|
}
|
|
|
|
module_init(pcied_init);
|
|
module_exit(pcied_cleanup);
|