[mirror_ubuntu-bionic-kernel.git] / drivers / pci / hotplug / pciehp_core.c

/*
 * PCI Express Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2001 IBM Corp.
 * Copyright (C) 2003-2004 Intel Corporation
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include "pciehp.h"
#include <linux/interrupt.h>
#include <linux/time.h>

/* Global variables */
int pciehp_debug;
int pciehp_poll_mode;
int pciehp_poll_time;
int pciehp_force;
struct workqueue_struct *pciehp_wq;

#define DRIVER_VERSION	"0.4"
#define DRIVER_AUTHOR	"Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
#define DRIVER_DESC	"PCI Express Hot Plug Controller Driver"

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param(pciehp_debug, bool, 0644);
module_param(pciehp_poll_mode, bool, 0644);
module_param(pciehp_poll_time, int, 0644);
module_param(pciehp_force, bool, 0644);
MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");

#define PCIE_MODULE_NAME "pciehp"

static int set_attention_status (struct hotplug_slot *slot, u8 value);
static int enable_slot		(struct hotplug_slot *slot);
static int disable_slot		(struct hotplug_slot *slot);
static int get_power_status	(struct hotplug_slot *slot, u8 *value);
static int get_attention_status	(struct hotplug_slot *slot, u8 *value);
static int get_latch_status	(struct hotplug_slot *slot, u8 *value);
static int get_adapter_status	(struct hotplug_slot *slot, u8 *value);
static int get_max_bus_speed	(struct hotplug_slot *slot, enum pci_bus_speed *value);
static int get_cur_bus_speed	(struct hotplug_slot *slot, enum pci_bus_speed *value);

static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
	.owner =		THIS_MODULE,
	.set_attention_status =	set_attention_status,
	.enable_slot =		enable_slot,
	.disable_slot =		disable_slot,
	.get_power_status =	get_power_status,
	.get_attention_status =	get_attention_status,
	.get_latch_status =	get_latch_status,
	.get_adapter_status =	get_adapter_status,
  	.get_max_bus_speed =	get_max_bus_speed,
  	.get_cur_bus_speed =	get_cur_bus_speed,
};

/*
 * Check the status of the Electro Mechanical Interlock (EMI)
 */
static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	return (slot->hpc_ops->get_emi_status(slot, value));
}

/*
 * sysfs interface for the Electro Mechanical Interlock (EMI)
 * 1 == locked, 0 == unlocked
 */
static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_lock_status(slot, &value);
	if (retval)
		goto lock_read_exit;
	retval = sprintf (buf, "%d\n", value);

lock_read_exit:
	return retval;
}

/*
 * Change the status of the Electro Mechanical Interlock (EMI)
 * This is a toggle - in addition there must be at least 1 second
 * in between toggles.
 */
static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
{
	struct slot *slot = hotplug_slot->private;
	int retval;
	u8 value;

	mutex_lock(&slot->ctrl->crit_sect);

	/* has it been >1 sec since our last toggle? */
	if ((get_seconds() - slot->last_emi_toggle) < 1)
		return -EINVAL;

	/* see what our current state is */
	retval = get_lock_status(hotplug_slot, &value);
	if (retval || (value == status))
		goto set_lock_exit;

	slot->hpc_ops->toggle_emi(slot);
set_lock_exit:
	mutex_unlock(&slot->ctrl->crit_sect);
	return 0;
}

/*
 * sysfs interface which allows the user to toggle the Electro Mechanical
 * Interlock.  Valid values are either 0 or 1.  0 == unlock, 1 == lock
 */
static ssize_t lock_write_file(struct hotplug_slot *hotplug_slot,
		const char *buf, size_t count)
{
	struct slot *slot = hotplug_slot->private;
	unsigned long llock;
	u8 lock;
	int retval = 0;

	llock = simple_strtoul(buf, NULL, 10);
	lock = (u8)(llock & 0xff);

	switch (lock) {
		case 0:
		case 1:
			retval = set_lock_status(hotplug_slot, lock);
			break;
		default:
			ctrl_err(slot->ctrl, "%d is an invalid lock value\n",
				 lock);
			retval = -EINVAL;
	}
	if (retval)
		return retval;
	return count;
}

static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
	.attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR},
	.show = lock_read_file,
	.store = lock_write_file
};

/**
 * release_slot - free up the memory used by a slot
 * @hotplug_slot: slot to free
 */
static void release_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, hotplug_slot_name(hotplug_slot));

	kfree(hotplug_slot->info);
	kfree(hotplug_slot);
}

static int init_slots(struct controller *ctrl)
{
	struct slot *slot;
	struct hotplug_slot *hotplug_slot;
	struct hotplug_slot_info *info;
	char name[SLOT_NAME_SIZE];
	int retval = -ENOMEM;

	list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
		hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
		if (!hotplug_slot)
			goto error;

		info = kzalloc(sizeof(*info), GFP_KERNEL);
		if (!info)
			goto error_hpslot;

		/* register this slot with the hotplug pci core */
		hotplug_slot->info = info;
		hotplug_slot->private = slot;
		hotplug_slot->release = &release_slot;
		hotplug_slot->ops = &pciehp_hotplug_slot_ops;
		slot->hotplug_slot = hotplug_slot;
		snprintf(name, SLOT_NAME_SIZE, "%u", slot->number);

		ctrl_dbg(ctrl, "Registering bus=%x dev=%x hp_slot=%x sun=%x "
			 "slot_device_offset=%x\n", slot->bus, slot->device,
			 slot->hp_slot, slot->number, ctrl->slot_device_offset);
		retval = pci_hp_register(hotplug_slot,
					 ctrl->pci_dev->subordinate,
					 slot->device,
					 name);
		if (retval) {
			ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
				 retval);
			goto error_info;
		}
		get_power_status(hotplug_slot, &info->power_status);
		get_attention_status(hotplug_slot, &info->attention_status);
		get_latch_status(hotplug_slot, &info->latch_status);
		get_adapter_status(hotplug_slot, &info->adapter_status);
		/* create additional sysfs entries */
		if (EMI(ctrl)) {
			retval = sysfs_create_file(&hotplug_slot->pci_slot->kobj,
				&hotplug_slot_attr_lock.attr);
			if (retval) {
				pci_hp_deregister(hotplug_slot);
				ctrl_err(ctrl, "cannot create additional sysfs "
					 "entries\n");
				goto error_info;
			}
		}
	}

	return 0;
error_info:
	kfree(info);
error_hpslot:
	kfree(hotplug_slot);
error:
	return retval;
}

static void cleanup_slots(struct controller *ctrl)
{
	struct slot *slot;

	list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
		if (EMI(ctrl))
			sysfs_remove_file(&slot->hotplug_slot->pci_slot->kobj,
				&hotplug_slot_attr_lock.attr);
		pci_hp_deregister(slot->hotplug_slot);
	}
}

/*
 * set_attention_status - Turns the Amber LED for a slot on, off or blink
 */
static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
{
	struct slot *slot = hotplug_slot->private;

	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		  __func__, slot_name(slot));

	hotplug_slot->info->attention_status = status;

	if (ATTN_LED(slot->ctrl))
		slot->hpc_ops->set_attention_status(slot, status);

	return 0;
}


static int enable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));

	return pciehp_sysfs_enable_slot(slot);
}


static int disable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		  __func__, slot_name(slot));

	return pciehp_sysfs_disable_slot(slot);
}

static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		  __func__, slot_name(slot));

	retval = slot->hpc_ops->get_power_status(slot, value);
	if (retval < 0)
		*value = hotplug_slot->info->power_status;

	return 0;
}

static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		  __func__, slot_name(slot));

	retval = slot->hpc_ops->get_attention_status(slot, value);
	if (retval < 0)
		*value = hotplug_slot->info->attention_status;

	return 0;
}

static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));

	retval = slot->hpc_ops->get_latch_status(slot, value);
	if (retval < 0)
		*value = hotplug_slot->info->latch_status;

	return 0;
}

static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));

	retval = slot->hpc_ops->get_adapter_status(slot, value);
	if (retval < 0)
		*value = hotplug_slot->info->adapter_status;

	return 0;
}

static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
				enum pci_bus_speed *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));

	retval = slot->hpc_ops->get_max_bus_speed(slot, value);
	if (retval < 0)
		*value = PCI_SPEED_UNKNOWN;

	return 0;
}

static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));

	retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
	if (retval < 0)
		*value = PCI_SPEED_UNKNOWN;

	return 0;
}

static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
{
	int rc;
	struct controller *ctrl;
	struct slot *t_slot;
	u8 value;
	struct pci_dev *pdev = dev->port;

	if (pciehp_force)
		dev_info(&dev->device,
			 "Bypassing BIOS check for pciehp use on %s\n",
			 pci_name(pdev));
	else if (pciehp_get_hp_hw_control_from_firmware(pdev))
		goto err_out_none;

	ctrl = pcie_init(dev);
	if (!ctrl) {
		dev_err(&dev->device, "controller initialization failed\n");
		goto err_out_none;
	}
	set_service_data(dev, ctrl);

	/* Setup the slot information structures */
	rc = init_slots(ctrl);
	if (rc) {
		if (rc == -EBUSY)
			ctrl_warn(ctrl, "slot already registered by another "
				  "hotplug driver\n");
		else
			ctrl_err(ctrl, "slot initialization failed\n");
		goto err_out_release_ctlr;
	}

	t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);

	t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
	if (value && pciehp_force) {
		rc = pciehp_enable_slot(t_slot);
		if (rc)	/* -ENODEV: shouldn't happen, but deal with it */
			value = 0;
	}
	if ((POWER_CTRL(ctrl)) && !value) {
		rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
		if (rc)
			goto err_out_free_ctrl_slot;
	}

	return 0;

err_out_free_ctrl_slot:
	cleanup_slots(ctrl);
err_out_release_ctlr:
	ctrl->hpc_ops->release_ctlr(ctrl);
err_out_none:
	return -ENODEV;
}

static void pciehp_remove (struct pcie_device *dev)
{
	struct controller *ctrl = get_service_data(dev);

	cleanup_slots(ctrl);
	ctrl->hpc_ops->release_ctlr(ctrl);
}

#ifdef CONFIG_PM
static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
{
	dev_info(&dev->device, "%s ENTRY\n", __func__);
	return 0;
}

static int pciehp_resume (struct pcie_device *dev)
{
	dev_info(&dev->device, "%s ENTRY\n", __func__);
	if (pciehp_force) {
		struct controller *ctrl = get_service_data(dev);
		struct slot *t_slot;
		u8 status;

		/* reinitialize the chipset's event detection logic */
		pcie_enable_notification(ctrl);

		t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);

		/* Check if slot is occupied */
		t_slot->hpc_ops->get_adapter_status(t_slot, &status);
		if (status)
			pciehp_enable_slot(t_slot);
		else
			pciehp_disable_slot(t_slot);
	}
	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 struct pcie_port_service_driver hpdriver_portdrv = {
	.name		= PCIE_MODULE_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;

	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", __func__);
	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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* PCI Express Hot Plug Controller Driver
	3	*
	4	* Copyright (C) 1995,2001 Compaq Computer Corporation
	5	* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
	6	* Copyright (C) 2001 IBM Corp.
	7	* Copyright (C) 2003-2004 Intel Corporation
	8	*
	9	* All rights reserved.
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or (at
	14	* your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful, but
	17	* WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	19	* NON INFRINGEMENT. See the GNU General Public License for more
	20	* details.
	21	*
	22	* You should have received a copy of the GNU General Public License
	23	* along with this program; if not, write to the Free Software
	24	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	25	*
8cf4c195	26	* Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
1da177e4 LT	27	*
	28	*/
	29
1da177e4 LT	30	#include <linux/module.h>
	31	#include <linux/moduleparam.h>
	32	#include <linux/kernel.h>
	33	#include <linux/types.h>
1da177e4	34	#include <linux/pci.h>
1da177e4	35	#include "pciehp.h"
1da177e4	36	#include <linux/interrupt.h>
34d03419	37	#include <linux/time.h>
1da177e4 LT	38
	39	/* Global variables */
	40	int pciehp_debug;
	41	int pciehp_poll_mode;
	42	int pciehp_poll_time;
a3a45ec8	43	int pciehp_force;
5d386e1a	44	struct workqueue_struct *pciehp_wq;
1da177e4 LT	45
	46	#define DRIVER_VERSION "0.4"
	47	#define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
	48	#define DRIVER_DESC "PCI Express Hot Plug Controller Driver"
	49
	50	MODULE_AUTHOR(DRIVER_AUTHOR);
	51	MODULE_DESCRIPTION(DRIVER_DESC);
	52	MODULE_LICENSE("GPL");
	53
	54	module_param(pciehp_debug, bool, 0644);
	55	module_param(pciehp_poll_mode, bool, 0644);
	56	module_param(pciehp_poll_time, int, 0644);
a3a45ec8	57	module_param(pciehp_force, bool, 0644);
1da177e4 LT	58	MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
	59	MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
	60	MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
a3a45ec8	61	MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
1da177e4 LT	62
	63	#define PCIE_MODULE_NAME "pciehp"
	64
1da177e4 LT	65	static int set_attention_status (struct hotplug_slot *slot, u8 value);
	66	static int enable_slot (struct hotplug_slot *slot);
	67	static int disable_slot (struct hotplug_slot *slot);
	68	static int get_power_status (struct hotplug_slot slot, u8 value);
	69	static int get_attention_status (struct hotplug_slot slot, u8 value);
	70	static int get_latch_status (struct hotplug_slot slot, u8 value);
	71	static int get_adapter_status (struct hotplug_slot slot, u8 value);
	72	static int get_max_bus_speed (struct hotplug_slot slot, enum pci_bus_speed value);
	73	static int get_cur_bus_speed (struct hotplug_slot slot, enum pci_bus_speed value);
	74
	75	static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
	76	.owner = THIS_MODULE,
	77	.set_attention_status = set_attention_status,
	78	.enable_slot = enable_slot,
	79	.disable_slot = disable_slot,
	80	.get_power_status = get_power_status,
	81	.get_attention_status = get_attention_status,
	82	.get_latch_status = get_latch_status,
	83	.get_adapter_status = get_adapter_status,
	84	.get_max_bus_speed = get_max_bus_speed,
	85	.get_cur_bus_speed = get_cur_bus_speed,
	86	};
	87
34d03419 KCA	88	/*
	89	* Check the status of the Electro Mechanical Interlock (EMI)
	90	*/
	91	static int get_lock_status(struct hotplug_slot hotplug_slot, u8 value)
	92	{
	93	struct slot *slot = hotplug_slot->private;
	94	return (slot->hpc_ops->get_emi_status(slot, value));
	95	}
	96
	97	/*
	98	* sysfs interface for the Electro Mechanical Interlock (EMI)
	99	* 1 == locked, 0 == unlocked
	100	*/
	101	static ssize_t lock_read_file(struct hotplug_slot slot, char buf)
	102	{
	103	int retval;
	104	u8 value;
	105
	106	retval = get_lock_status(slot, &value);
	107	if (retval)
	108	goto lock_read_exit;
	109	retval = sprintf (buf, "%d\n", value);
	110
	111	lock_read_exit:
	112	return retval;
	113	}
	114
	115	/*
	116	* Change the status of the Electro Mechanical Interlock (EMI)
	117	* This is a toggle - in addition there must be at least 1 second
	118	* in between toggles.
	119	*/
	120	static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
	121	{
	122	struct slot *slot = hotplug_slot->private;
	123	int retval;
	124	u8 value;
	125
	126	mutex_lock(&slot->ctrl->crit_sect);
	127
	128	/* has it been >1 sec since our last toggle? */
	129	if ((get_seconds() - slot->last_emi_toggle) < 1)
	130	return -EINVAL;
	131
	132	/* see what our current state is */
	133	retval = get_lock_status(hotplug_slot, &value);
	134	if (retval \|\| (value == status))
	135	goto set_lock_exit;
	136
	137	slot->hpc_ops->toggle_emi(slot);
	138	set_lock_exit:
	139	mutex_unlock(&slot->ctrl->crit_sect);
	140	return 0;
	141	}
	142
	143	/*
	144	* sysfs interface which allows the user to toggle the Electro Mechanical
	145	* Interlock. Valid values are either 0 or 1. 0 == unlock, 1 == lock
	146	*/
7f2feec1 TI	147	static ssize_t lock_write_file(struct hotplug_slot *hotplug_slot,
7f2feec1 TI	148	const char *buf, size_t count)
34d03419	149	{
7f2feec1	150	struct slot *slot = hotplug_slot->private;
34d03419 KCA	151	unsigned long llock;
	152	u8 lock;
	153	int retval = 0;
	154
	155	llock = simple_strtoul(buf, NULL, 10);
	156	lock = (u8)(llock & 0xff);
	157
	158	switch (lock) {
	159	case 0:
	160	case 1:
7f2feec1	161	retval = set_lock_status(hotplug_slot, lock);
34d03419 KCA	162	break;
34d03419 KCA	163	default:
7f2feec1 TI	164	ctrl_err(slot->ctrl, "%d is an invalid lock value\n",
7f2feec1 TI	165	lock);
34d03419 KCA	166	retval = -EINVAL;
	167	}
	168	if (retval)
	169	return retval;
	170	return count;
	171	}
	172
	173	static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
	174	.attr = {.name = "lock", .mode = S_IFREG \| S_IRUGO \| S_IWUSR},
	175	.show = lock_read_file,
	176	.store = lock_write_file
	177	};
	178
b308240b DS	179	/**
	180	* release_slot - free up the memory used by a slot
	181	* @hotplug_slot: slot to free
	182	*/
	183	static void release_slot(struct hotplug_slot *hotplug_slot)
	184	{
7f2feec1 TI	185	struct slot *slot = hotplug_slot->private;
	186
	187	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
e1acb24f	188	__func__, hotplug_slot_name(hotplug_slot));
b308240b	189
c4635eb0 KK	190	kfree(hotplug_slot->info);
c4635eb0 KK	191	kfree(hotplug_slot);
a0b17257 KK	192	}
a0b17257 KK	193
1da177e4 LT	194	static int init_slots(struct controller *ctrl)
1da177e4 LT	195	{
121082e2	196	struct slot *slot;
121082e2	197	struct hotplug_slot *hotplug_slot;
a0b17257	198	struct hotplug_slot_info *info;
e1acb24f	199	char name[SLOT_NAME_SIZE];
a0b17257	200	int retval = -ENOMEM;
1da177e4	201
c4635eb0	202	list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
a0b17257 KK	203	hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
a0b17257 KK	204	if (!hotplug_slot)
c4635eb0	205	goto error;
1da177e4	206
a0b17257 KK	207	info = kzalloc(sizeof(*info), GFP_KERNEL);
a0b17257 KK	208	if (!info)
1da177e4	209	goto error_hpslot;
1da177e4 LT	210
1da177e4 LT	211	/* register this slot with the hotplug pci core */
c4635eb0	212	hotplug_slot->info = info;
121082e2 JJ	213	hotplug_slot->private = slot;
121082e2 JJ	214	hotplug_slot->release = &release_slot;
121082e2	215	hotplug_slot->ops = &pciehp_hotplug_slot_ops;
c4635eb0	216	slot->hotplug_slot = hotplug_slot;
e1acb24f	217	snprintf(name, SLOT_NAME_SIZE, "%u", slot->number);
121082e2	218
7f2feec1 TI	219	ctrl_dbg(ctrl, "Registering bus=%x dev=%x hp_slot=%x sun=%x "
	220	"slot_device_offset=%x\n", slot->bus, slot->device,
	221	slot->hp_slot, slot->number, ctrl->slot_device_offset);
f46753c5 AC	222	retval = pci_hp_register(hotplug_slot,
f46753c5 AC	223	ctrl->pci_dev->subordinate,
1359f270	224	slot->device,
e1acb24f	225	name);
a0b17257	226	if (retval) {
7f2feec1 TI	227	ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
7f2feec1 TI	228	retval);
a0b17257	229	goto error_info;
1da177e4	230	}
e1acb24f AC	231	get_power_status(hotplug_slot, &info->power_status);
	232	get_attention_status(hotplug_slot, &info->attention_status);
	233	get_latch_status(hotplug_slot, &info->latch_status);
	234	get_adapter_status(hotplug_slot, &info->adapter_status);
34d03419	235	/* create additional sysfs entries */
ae416e6b	236	if (EMI(ctrl)) {
f46753c5	237	retval = sysfs_create_file(&hotplug_slot->pci_slot->kobj,
34d03419 KCA	238	&hotplug_slot_attr_lock.attr);
	239	if (retval) {
	240	pci_hp_deregister(hotplug_slot);
7f2feec1 TI	241	ctrl_err(ctrl, "cannot create additional sysfs "
7f2feec1 TI	242	"entries\n");
34d03419 KCA	243	goto error_info;
	244	}
	245	}
1da177e4 LT	246	}
	247
	248	return 0;
1da177e4	249	error_info:
a0b17257	250	kfree(info);
1da177e4	251	error_hpslot:
121082e2	252	kfree(hotplug_slot);
1da177e4	253	error:
a0b17257	254	return retval;
1da177e4 LT	255	}
1da177e4 LT	256
2410fa4e	257	static void cleanup_slots(struct controller *ctrl)
1da177e4	258	{
2410fa4e	259	struct slot *slot;
1da177e4	260
c4635eb0	261	list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
ae416e6b	262	if (EMI(ctrl))
f46753c5	263	sysfs_remove_file(&slot->hotplug_slot->pci_slot->kobj,
34d03419	264	&hotplug_slot_attr_lock.attr);
2410fa4e	265	pci_hp_deregister(slot->hotplug_slot);
1da177e4	266	}
1da177e4 LT	267	}
1da177e4 LT	268
1da177e4 LT	269	/*
	270	* set_attention_status - Turns the Amber LED for a slot on, off or blink
	271	*/
	272	static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
	273	{
	274	struct slot *slot = hotplug_slot->private;
	275
7f2feec1	276	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
e1acb24f	277	__func__, slot_name(slot));
1da177e4 LT	278
1da177e4 LT	279	hotplug_slot->info->attention_status = status;
a073a826	280
ae416e6b	281	if (ATTN_LED(slot->ctrl))
1da177e4 LT	282	slot->hpc_ops->set_attention_status(slot, status);
	283
	284	return 0;
	285	}
	286
	287
	288	static int enable_slot(struct hotplug_slot *hotplug_slot)
	289	{
	290	struct slot *slot = hotplug_slot->private;
	291
7f2feec1	292	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
e1acb24f	293	__func__, slot_name(slot));
1da177e4	294
5d386e1a	295	return pciehp_sysfs_enable_slot(slot);
1da177e4 LT	296	}
	297
	298
	299	static int disable_slot(struct hotplug_slot *hotplug_slot)
	300	{
	301	struct slot *slot = hotplug_slot->private;
	302
7f2feec1	303	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
e1acb24f	304	__func__, slot_name(slot));
1da177e4	305
5d386e1a	306	return pciehp_sysfs_disable_slot(slot);
1da177e4 LT	307	}
	308
	309	static int get_power_status(struct hotplug_slot hotplug_slot, u8 value)
	310	{
	311	struct slot *slot = hotplug_slot->private;
	312	int retval;
	313
7f2feec1	314	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
e1acb24f	315	__func__, slot_name(slot));
1da177e4 LT	316
	317	retval = slot->hpc_ops->get_power_status(slot, value);
	318	if (retval < 0)
	319	*value = hotplug_slot->info->power_status;
	320
	321	return 0;
	322	}
	323
	324	static int get_attention_status(struct hotplug_slot hotplug_slot, u8 value)
	325	{
	326	struct slot *slot = hotplug_slot->private;
	327	int retval;
	328
7f2feec1	329	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
e1acb24f	330	__func__, slot_name(slot));
1da177e4 LT	331
	332	retval = slot->hpc_ops->get_attention_status(slot, value);
	333	if (retval < 0)
	334	*value = hotplug_slot->info->attention_status;
	335
	336	return 0;
	337	}
	338
	339	static int get_latch_status(struct hotplug_slot hotplug_slot, u8 value)
	340	{
	341	struct slot *slot = hotplug_slot->private;
	342	int retval;
	343
7f2feec1	344	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
e1acb24f	345	__func__, slot_name(slot));
1da177e4 LT	346
	347	retval = slot->hpc_ops->get_latch_status(slot, value);
	348	if (retval < 0)
	349	*value = hotplug_slot->info->latch_status;
	350
	351	return 0;
	352	}
	353
	354	static int get_adapter_status(struct hotplug_slot hotplug_slot, u8 value)
	355	{
	356	struct slot *slot = hotplug_slot->private;
	357	int retval;
	358
7f2feec1	359	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
e1acb24f	360	__func__, slot_name(slot));
1da177e4 LT	361
	362	retval = slot->hpc_ops->get_adapter_status(slot, value);
	363	if (retval < 0)
	364	*value = hotplug_slot->info->adapter_status;
	365
	366	return 0;
	367	}
	368
f46753c5 AC	369	static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
f46753c5 AC	370	enum pci_bus_speed *value)
1da177e4 LT	371	{
	372	struct slot *slot = hotplug_slot->private;
	373	int retval;
	374
7f2feec1	375	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
e1acb24f	376	__func__, slot_name(slot));
a073a826	377
1da177e4 LT	378	retval = slot->hpc_ops->get_max_bus_speed(slot, value);
	379	if (retval < 0)
	380	*value = PCI_SPEED_UNKNOWN;
	381
	382	return 0;
	383	}
	384
	385	static int get_cur_bus_speed(struct hotplug_slot hotplug_slot, enum pci_bus_speed value)
	386	{
	387	struct slot *slot = hotplug_slot->private;
	388	int retval;
	389
7f2feec1	390	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
e1acb24f	391	__func__, slot_name(slot));
a073a826	392
1da177e4 LT	393	retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
	394	if (retval < 0)
	395	*value = PCI_SPEED_UNKNOWN;
	396
	397	return 0;
	398	}
	399
	400	static int pciehp_probe(struct pcie_device dev, const struct pcie_port_service_id id)
	401	{
	402	int rc;
	403	struct controller *ctrl;
	404	struct slot *t_slot;
1da177e4	405	u8 value;
125c39f7 KK	406	struct pci_dev *pdev = dev->port;
	407
	408	if (pciehp_force)
7f2feec1 TI	409	dev_info(&dev->device,
	410	"Bypassing BIOS check for pciehp use on %s\n",
	411	pci_name(pdev));
125c39f7 KK	412	else if (pciehp_get_hp_hw_control_from_firmware(pdev))
125c39f7 KK	413	goto err_out_none;
a073a826	414
c4635eb0	415	ctrl = pcie_init(dev);
1da177e4	416	if (!ctrl) {
7f2feec1	417	dev_err(&dev->device, "controller initialization failed\n");
c4635eb0	418	goto err_out_none;
1da177e4	419	}
b9708940	420	set_service_data(dev, ctrl);
1da177e4	421
1da177e4 LT	422	/* Setup the slot information structures */
	423	rc = init_slots(ctrl);
	424	if (rc) {
f46753c5	425	if (rc == -EBUSY)
7f2feec1 TI	426	ctrl_warn(ctrl, "slot already registered by another "
7f2feec1 TI	427	"hotplug driver\n");
f46753c5	428	else
7f2feec1	429	ctrl_err(ctrl, "slot initialization failed\n");
a8c2b635	430	goto err_out_release_ctlr;
1da177e4 LT	431	}
1da177e4 LT	432
48fe3915	433	t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
1da177e4	434
1da177e4	435	t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
9e585824	436	if (value && pciehp_force) {
0a3c33d7 ML	437	rc = pciehp_enable_slot(t_slot);
	438	if (rc) /* -ENODEV: shouldn't happen, but deal with it */
	439	value = 0;
	440	}
ae416e6b	441	if ((POWER_CTRL(ctrl)) && !value) {
1da177e4	442	rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
44ef4cef	443	if (rc)
1da177e4	444	goto err_out_free_ctrl_slot;
1da177e4 LT	445	}
1da177e4 LT	446
1da177e4 LT	447	return 0;
	448
	449	err_out_free_ctrl_slot:
	450	cleanup_slots(ctrl);
a8c2b635	451	err_out_release_ctlr:
1da177e4	452	ctrl->hpc_ops->release_ctlr(ctrl);
1da177e4 LT	453	err_out_none:
	454	return -ENODEV;
	455	}
	456
92333526	457	static void pciehp_remove (struct pcie_device *dev)
1da177e4	458	{
b9708940	459	struct controller *ctrl = get_service_data(dev);
1da177e4	460
92333526 KK	461	cleanup_slots(ctrl);
92333526 KK	462	ctrl->hpc_ops->release_ctlr(ctrl);
1da177e4 LT	463	}
	464
	465	#ifdef CONFIG_PM
7f4927c1	466	static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
1da177e4	467	{
7f2feec1	468	dev_info(&dev->device, "%s ENTRY\n", __func__);
1da177e4 LT	469	return 0;
	470	}
	471
	472	static int pciehp_resume (struct pcie_device *dev)
	473	{
7f2feec1	474	dev_info(&dev->device, "%s ENTRY\n", __func__);
cd2fe83a	475	if (pciehp_force) {
b9708940	476	struct controller *ctrl = get_service_data(dev);
cd2fe83a ML	477	struct slot *t_slot;
	478	u8 status;
	479
	480	/* reinitialize the chipset's event detection logic */
c4635eb0	481	pcie_enable_notification(ctrl);
cd2fe83a ML	482
	483	t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
	484
	485	/* Check if slot is occupied */
	486	t_slot->hpc_ops->get_adapter_status(t_slot, &status);
	487	if (status)
	488	pciehp_enable_slot(t_slot);
	489	else
	490	pciehp_disable_slot(t_slot);
	491	}
1da177e4 LT	492	return 0;
	493	}
	494	#endif
	495
a073a826 KK	496	static struct pcie_port_service_id port_pci_ids[] = { {
a073a826 KK	497	.vendor = PCI_ANY_ID,
1da177e4	498	.device = PCI_ANY_ID,
8b245e45	499	.port_type = PCIE_ANY_PORT,
1da177e4	500	.service_type = PCIE_PORT_SERVICE_HP,
a073a826	501	.driver_data = 0,
1da177e4 LT	502	}, { /* end: all zeroes */ }
1da177e4 LT	503	};
1da177e4 LT	504
1da177e4 LT	505	static struct pcie_port_service_driver hpdriver_portdrv = {
83e9ad54	506	.name = PCIE_MODULE_NAME,
1da177e4 LT	507	.id_table = &port_pci_ids[0],
	508
	509	.probe = pciehp_probe,
	510	.remove = pciehp_remove,
	511
	512	#ifdef CONFIG_PM
	513	.suspend = pciehp_suspend,
	514	.resume = pciehp_resume,
	515	#endif /* PM */
	516	};
	517
	518	static int __init pcied_init(void)
	519	{
	520	int retval = 0;
	521
a8a2be94 RS	522	retval = pcie_port_service_register(&hpdriver_portdrv);
	523	dbg("pcie_port_service_register = %d\n", retval);
	524	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
	525	if (retval)
66bef8c0	526	dbg("%s: Failure to register service\n", __func__);
1da177e4 LT	527	return retval;
	528	}
	529
	530	static void __exit pcied_cleanup(void)
	531	{
	532	dbg("unload_pciehpd()\n");
1da177e4	533	pcie_port_service_unregister(&hpdriver_portdrv);
1da177e4 LT	534	info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
	535	}
	536
	537	module_init(pcied_init);
	538	module_exit(pcied_cleanup);