359 lines
9.2 KiB
C
359 lines
9.2 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/slab.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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bool pciehp_debug;
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bool pciehp_poll_mode;
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int pciehp_poll_time;
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bool pciehp_force;
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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 OSHP is 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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/**
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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__, hotplug_slot_name(hotplug_slot));
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kfree(hotplug_slot->ops);
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kfree(hotplug_slot->info);
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kfree(hotplug_slot);
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}
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static int init_slot(struct controller *ctrl)
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{
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struct slot *slot = ctrl->slot;
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struct hotplug_slot *hotplug = NULL;
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struct hotplug_slot_info *info = NULL;
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struct hotplug_slot_ops *ops = NULL;
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char name[SLOT_NAME_SIZE];
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int retval = -ENOMEM;
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hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
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if (!hotplug)
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goto out;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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goto out;
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/* Setup hotplug slot ops */
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ops = kzalloc(sizeof(*ops), GFP_KERNEL);
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if (!ops)
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goto out;
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ops->enable_slot = enable_slot;
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ops->disable_slot = disable_slot;
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ops->get_power_status = get_power_status;
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ops->get_adapter_status = get_adapter_status;
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if (MRL_SENS(ctrl))
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ops->get_latch_status = get_latch_status;
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if (ATTN_LED(ctrl)) {
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ops->get_attention_status = get_attention_status;
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ops->set_attention_status = set_attention_status;
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}
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/* register this slot with the hotplug pci core */
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hotplug->info = info;
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hotplug->private = slot;
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hotplug->release = &release_slot;
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hotplug->ops = ops;
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slot->hotplug_slot = hotplug;
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snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
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ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:00 sun=%x\n",
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pci_domain_nr(ctrl->pcie->port->subordinate),
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ctrl->pcie->port->subordinate->number, PSN(ctrl));
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retval = pci_hp_register(hotplug,
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ctrl->pcie->port->subordinate, 0, name);
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if (retval)
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ctrl_err(ctrl,
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"pci_hp_register failed with error %d\n", retval);
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out:
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if (retval) {
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kfree(ops);
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kfree(info);
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kfree(hotplug);
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}
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return retval;
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}
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static void cleanup_slot(struct controller *ctrl)
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{
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pci_hp_deregister(ctrl->slot->hotplug_slot);
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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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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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return pciehp_set_attention_status(slot, status);
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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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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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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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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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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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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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return pciehp_get_power_status(slot, value);
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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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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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return pciehp_get_attention_status(slot, value);
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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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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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return pciehp_get_latch_status(slot, value);
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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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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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return pciehp_get_adapter_status(slot, value);
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}
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static int pciehp_probe(struct pcie_device *dev)
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{
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int rc;
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struct controller *ctrl;
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struct slot *slot;
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u8 occupied, poweron;
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if (pciehp_force)
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dev_info(&dev->device,
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"Bypassing BIOS check for pciehp use on %s\n",
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pci_name(dev->port));
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else if (pciehp_acpi_slot_detection_check(dev->port))
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goto err_out_none;
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ctrl = pcie_init(dev);
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if (!ctrl) {
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dev_err(&dev->device, "Controller initialization failed\n");
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goto err_out_none;
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}
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set_service_data(dev, ctrl);
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/* Setup the slot information structures */
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rc = init_slot(ctrl);
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if (rc) {
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if (rc == -EBUSY)
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ctrl_warn(ctrl, "Slot already registered by another "
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"hotplug driver\n");
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else
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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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/* Enable events after we have setup the data structures */
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rc = pcie_init_notification(ctrl);
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if (rc) {
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ctrl_err(ctrl, "Notification initialization failed\n");
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goto err_out_free_ctrl_slot;
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}
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/* Check if slot is occupied */
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slot = ctrl->slot;
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pciehp_get_adapter_status(slot, &occupied);
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pciehp_get_power_status(slot, &poweron);
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if (occupied && pciehp_force)
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pciehp_enable_slot(slot);
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/* If empty slot's power status is on, turn power off */
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if (!occupied && poweron && POWER_CTRL(ctrl))
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pciehp_power_off_slot(slot);
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return 0;
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err_out_free_ctrl_slot:
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cleanup_slot(ctrl);
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err_out_release_ctlr:
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pciehp_release_ctrl(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 controller *ctrl = get_service_data(dev);
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cleanup_slot(ctrl);
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pciehp_release_ctrl(ctrl);
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}
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#ifdef CONFIG_PM
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static int pciehp_suspend (struct pcie_device *dev)
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{
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return 0;
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}
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static int pciehp_resume (struct pcie_device *dev)
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{
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struct controller *ctrl;
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struct slot *slot;
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u8 status;
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ctrl = get_service_data(dev);
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/* reinitialize the chipset's event detection logic */
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pcie_enable_notification(ctrl);
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slot = ctrl->slot;
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/* Check if slot is occupied */
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pciehp_get_adapter_status(slot, &status);
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if (status)
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pciehp_enable_slot(slot);
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else
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pciehp_disable_slot(slot);
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return 0;
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}
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#endif /* PM */
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static struct pcie_port_service_driver hpdriver_portdrv = {
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.name = PCIE_MODULE_NAME,
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.port_type = PCIE_ANY_PORT,
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.service = PCIE_PORT_SERVICE_HP,
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.probe = pciehp_probe,
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.remove = pciehp_remove,
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#ifdef CONFIG_PM
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.suspend = pciehp_suspend,
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.resume = pciehp_resume,
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#endif /* PM */
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};
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static int __init pcied_init(void)
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{
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int retval = 0;
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pciehp_firmware_init();
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retval = pcie_port_service_register(&hpdriver_portdrv);
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dbg("pcie_port_service_register = %d\n", retval);
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info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
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if (retval)
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dbg("Failure to register service\n");
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return retval;
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}
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static void __exit pcied_cleanup(void)
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{
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dbg("unload_pciehpd()\n");
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pcie_port_service_unregister(&hpdriver_portdrv);
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info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
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}
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module_init(pcied_init);
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module_exit(pcied_cleanup);
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