[deliverable/linux.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) {
		mutex_unlock(&slot->ctrl->crit_sect);
		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 domain:bus:dev=%04x:%02x:%02x "
 			 "hp_slot=%x sun=%x slot_device_offset=%x\n",
 			 pci_domain_nr(ctrl->pci_dev->subordinate),
 			 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)
{
	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;
	}

	/* Enable events after we have setup the data structures */
	rc = pcie_init_notification(ctrl);
	if (rc) {
		ctrl_err(ctrl, "Notification initialization failed\n");
		goto err_out_release_ctlr;
	}

	/* Check if slot is occupied */
	t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
	t_slot->hpc_ops->get_adapter_status(t_slot, &value);
	if (value) {
		if (pciehp_force)
			pciehp_enable_slot(t_slot);
	} else {
		/* Power off slot if not occupied */
		if (POWER_CTRL(ctrl)) {
			rc = t_slot->hpc_ops->power_off_slot(t_slot);
			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)
{
	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 /* PM */

static struct pcie_port_service_driver hpdriver_portdrv = {
	.name		= PCIE_MODULE_NAME,
	.port_type	= PCIE_ANY_PORT,
	.service	= PCIE_PORT_SERVICE_HP,

	.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;

	pciehp_firmware_init();
	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("Failure to register service\n");
	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? */
c2fdd36b JS	129	if ((get_seconds() - slot->last_emi_toggle) < 1) {
c2fdd36b JS	130	mutex_unlock(&slot->ctrl->crit_sect);
34d03419	131	return -EINVAL;
c2fdd36b	132	}
34d03419 KCA	133
	134	/* see what our current state is */
	135	retval = get_lock_status(hotplug_slot, &value);
	136	if (retval \|\| (value == status))
	137	goto set_lock_exit;
	138
	139	slot->hpc_ops->toggle_emi(slot);
	140	set_lock_exit:
	141	mutex_unlock(&slot->ctrl->crit_sect);
	142	return 0;
	143	}
	144
	145	/*
	146	* sysfs interface which allows the user to toggle the Electro Mechanical
	147	* Interlock. Valid values are either 0 or 1. 0 == unlock, 1 == lock
	148	*/
7f2feec1 TI	149	static ssize_t lock_write_file(struct hotplug_slot *hotplug_slot,
7f2feec1 TI	150	const char *buf, size_t count)
34d03419	151	{
7f2feec1	152	struct slot *slot = hotplug_slot->private;
34d03419 KCA	153	unsigned long llock;
	154	u8 lock;
	155	int retval = 0;
	156
	157	llock = simple_strtoul(buf, NULL, 10);
	158	lock = (u8)(llock & 0xff);
	159
	160	switch (lock) {
	161	case 0:
	162	case 1:
7f2feec1	163	retval = set_lock_status(hotplug_slot, lock);
34d03419 KCA	164	break;
34d03419 KCA	165	default:
7f2feec1 TI	166	ctrl_err(slot->ctrl, "%d is an invalid lock value\n",
7f2feec1 TI	167	lock);
34d03419 KCA	168	retval = -EINVAL;
	169	}
	170	if (retval)
	171	return retval;
	172	return count;
	173	}
	174
	175	static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
	176	.attr = {.name = "lock", .mode = S_IFREG \| S_IRUGO \| S_IWUSR},
	177	.show = lock_read_file,
	178	.store = lock_write_file
	179	};
	180
b308240b DS	181	/**
	182	* release_slot - free up the memory used by a slot
	183	* @hotplug_slot: slot to free
	184	*/
	185	static void release_slot(struct hotplug_slot *hotplug_slot)
	186	{
7f2feec1 TI	187	struct slot *slot = hotplug_slot->private;
7f2feec1 TI	188
18b341b7	189	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
e1acb24f	190	__func__, hotplug_slot_name(hotplug_slot));
b308240b	191
c4635eb0 KK	192	kfree(hotplug_slot->info);
c4635eb0 KK	193	kfree(hotplug_slot);
a0b17257 KK	194	}
a0b17257 KK	195
1da177e4 LT	196	static int init_slots(struct controller *ctrl)
1da177e4 LT	197	{
121082e2	198	struct slot *slot;
121082e2	199	struct hotplug_slot *hotplug_slot;
a0b17257	200	struct hotplug_slot_info *info;
e1acb24f	201	char name[SLOT_NAME_SIZE];
a0b17257	202	int retval = -ENOMEM;
1da177e4	203
c4635eb0	204	list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
a0b17257 KK	205	hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
a0b17257 KK	206	if (!hotplug_slot)
c4635eb0	207	goto error;
1da177e4	208
a0b17257 KK	209	info = kzalloc(sizeof(*info), GFP_KERNEL);
a0b17257 KK	210	if (!info)
1da177e4	211	goto error_hpslot;
1da177e4 LT	212
1da177e4 LT	213	/* register this slot with the hotplug pci core */
c4635eb0	214	hotplug_slot->info = info;
121082e2 JJ	215	hotplug_slot->private = slot;
121082e2 JJ	216	hotplug_slot->release = &release_slot;
121082e2	217	hotplug_slot->ops = &pciehp_hotplug_slot_ops;
c4635eb0	218	slot->hotplug_slot = hotplug_slot;
e1acb24f	219	snprintf(name, SLOT_NAME_SIZE, "%u", slot->number);
121082e2	220
18b341b7 TI	221	ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
	222	"hp_slot=%x sun=%x slot_device_offset=%x\n",
	223	pci_domain_nr(ctrl->pci_dev->subordinate),
	224	slot->bus, slot->device, slot->hp_slot, slot->number,
	225	ctrl->slot_device_offset);
f46753c5 AC	226	retval = pci_hp_register(hotplug_slot,
f46753c5 AC	227	ctrl->pci_dev->subordinate,
1359f270	228	slot->device,
e1acb24f	229	name);
a0b17257	230	if (retval) {
7f2feec1 TI	231	ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
7f2feec1 TI	232	retval);
a0b17257	233	goto error_info;
1da177e4	234	}
e1acb24f AC	235	get_power_status(hotplug_slot, &info->power_status);
	236	get_attention_status(hotplug_slot, &info->attention_status);
	237	get_latch_status(hotplug_slot, &info->latch_status);
	238	get_adapter_status(hotplug_slot, &info->adapter_status);
34d03419	239	/* create additional sysfs entries */
ae416e6b	240	if (EMI(ctrl)) {
f46753c5	241	retval = sysfs_create_file(&hotplug_slot->pci_slot->kobj,
34d03419 KCA	242	&hotplug_slot_attr_lock.attr);
	243	if (retval) {
	244	pci_hp_deregister(hotplug_slot);
18b341b7	245	ctrl_err(ctrl, "Cannot create additional sysfs "
7f2feec1	246	"entries\n");
34d03419 KCA	247	goto error_info;
	248	}
	249	}
1da177e4 LT	250	}
	251
	252	return 0;
1da177e4	253	error_info:
a0b17257	254	kfree(info);
1da177e4	255	error_hpslot:
121082e2	256	kfree(hotplug_slot);
1da177e4	257	error:
a0b17257	258	return retval;
1da177e4 LT	259	}
1da177e4 LT	260
2410fa4e	261	static void cleanup_slots(struct controller *ctrl)
1da177e4	262	{
2410fa4e	263	struct slot *slot;
1da177e4	264
c4635eb0	265	list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
ae416e6b	266	if (EMI(ctrl))
f46753c5	267	sysfs_remove_file(&slot->hotplug_slot->pci_slot->kobj,
34d03419	268	&hotplug_slot_attr_lock.attr);
2410fa4e	269	pci_hp_deregister(slot->hotplug_slot);
1da177e4	270	}
1da177e4 LT	271	}
1da177e4 LT	272
1da177e4 LT	273	/*
	274	* set_attention_status - Turns the Amber LED for a slot on, off or blink
	275	*/
	276	static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
	277	{
	278	struct slot *slot = hotplug_slot->private;
	279
18b341b7	280	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
e1acb24f	281	__func__, slot_name(slot));
1da177e4 LT	282
1da177e4 LT	283	hotplug_slot->info->attention_status = status;
a073a826	284
ae416e6b	285	if (ATTN_LED(slot->ctrl))
1da177e4 LT	286	slot->hpc_ops->set_attention_status(slot, status);
	287
	288	return 0;
	289	}
	290
	291
	292	static int enable_slot(struct hotplug_slot *hotplug_slot)
	293	{
	294	struct slot *slot = hotplug_slot->private;
	295
18b341b7	296	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
e1acb24f	297	__func__, slot_name(slot));
1da177e4	298
5d386e1a	299	return pciehp_sysfs_enable_slot(slot);
1da177e4 LT	300	}
	301
	302
	303	static int disable_slot(struct hotplug_slot *hotplug_slot)
	304	{
	305	struct slot *slot = hotplug_slot->private;
	306
18b341b7	307	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
e1acb24f	308	__func__, slot_name(slot));
1da177e4	309
5d386e1a	310	return pciehp_sysfs_disable_slot(slot);
1da177e4 LT	311	}
	312
	313	static int get_power_status(struct hotplug_slot hotplug_slot, u8 value)
	314	{
	315	struct slot *slot = hotplug_slot->private;
	316	int retval;
	317
18b341b7	318	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
e1acb24f	319	__func__, slot_name(slot));
1da177e4 LT	320
	321	retval = slot->hpc_ops->get_power_status(slot, value);
	322	if (retval < 0)
	323	*value = hotplug_slot->info->power_status;
	324
	325	return 0;
	326	}
	327
	328	static int get_attention_status(struct hotplug_slot hotplug_slot, u8 value)
	329	{
	330	struct slot *slot = hotplug_slot->private;
	331	int retval;
	332
18b341b7	333	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
e1acb24f	334	__func__, slot_name(slot));
1da177e4 LT	335
	336	retval = slot->hpc_ops->get_attention_status(slot, value);
	337	if (retval < 0)
	338	*value = hotplug_slot->info->attention_status;
	339
	340	return 0;
	341	}
	342
	343	static int get_latch_status(struct hotplug_slot hotplug_slot, u8 value)
	344	{
	345	struct slot *slot = hotplug_slot->private;
	346	int retval;
	347
18b341b7	348	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
e1acb24f	349	__func__, slot_name(slot));
1da177e4 LT	350
	351	retval = slot->hpc_ops->get_latch_status(slot, value);
	352	if (retval < 0)
	353	*value = hotplug_slot->info->latch_status;
	354
	355	return 0;
	356	}
	357
	358	static int get_adapter_status(struct hotplug_slot hotplug_slot, u8 value)
	359	{
	360	struct slot *slot = hotplug_slot->private;
	361	int retval;
	362
18b341b7	363	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
e1acb24f	364	__func__, slot_name(slot));
1da177e4 LT	365
	366	retval = slot->hpc_ops->get_adapter_status(slot, value);
	367	if (retval < 0)
	368	*value = hotplug_slot->info->adapter_status;
	369
	370	return 0;
	371	}
	372
f46753c5 AC	373	static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
f46753c5 AC	374	enum pci_bus_speed *value)
1da177e4 LT	375	{
	376	struct slot *slot = hotplug_slot->private;
	377	int retval;
	378
18b341b7	379	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
e1acb24f	380	__func__, slot_name(slot));
a073a826	381
1da177e4 LT	382	retval = slot->hpc_ops->get_max_bus_speed(slot, value);
	383	if (retval < 0)
	384	*value = PCI_SPEED_UNKNOWN;
	385
	386	return 0;
	387	}
	388
	389	static int get_cur_bus_speed(struct hotplug_slot hotplug_slot, enum pci_bus_speed value)
	390	{
	391	struct slot *slot = hotplug_slot->private;
	392	int retval;
	393
18b341b7	394	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
e1acb24f	395	__func__, slot_name(slot));
a073a826	396
1da177e4 LT	397	retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
	398	if (retval < 0)
	399	*value = PCI_SPEED_UNKNOWN;
	400
	401	return 0;
	402	}
	403
0516c8bc	404	static int pciehp_probe(struct pcie_device *dev)
1da177e4 LT	405	{
	406	int rc;
	407	struct controller *ctrl;
	408	struct slot *t_slot;
1da177e4	409	u8 value;
125c39f7 KK	410	struct pci_dev *pdev = dev->port;
	411
	412	if (pciehp_force)
7f2feec1 TI	413	dev_info(&dev->device,
	414	"Bypassing BIOS check for pciehp use on %s\n",
	415	pci_name(pdev));
125c39f7 KK	416	else if (pciehp_get_hp_hw_control_from_firmware(pdev))
125c39f7 KK	417	goto err_out_none;
a073a826	418
c4635eb0	419	ctrl = pcie_init(dev);
1da177e4	420	if (!ctrl) {
18b341b7	421	dev_err(&dev->device, "Controller initialization failed\n");
c4635eb0	422	goto err_out_none;
1da177e4	423	}
b9708940	424	set_service_data(dev, ctrl);
1da177e4	425
1da177e4 LT	426	/* Setup the slot information structures */
	427	rc = init_slots(ctrl);
	428	if (rc) {
f46753c5	429	if (rc == -EBUSY)
18b341b7	430	ctrl_warn(ctrl, "Slot already registered by another "
7f2feec1	431	"hotplug driver\n");
f46753c5	432	else
18b341b7	433	ctrl_err(ctrl, "Slot initialization failed\n");
a8c2b635	434	goto err_out_release_ctlr;
1da177e4 LT	435	}
1da177e4 LT	436
dbc7e1e5 EB	437	/* Enable events after we have setup the data structures */
	438	rc = pcie_init_notification(ctrl);
	439	if (rc) {
	440	ctrl_err(ctrl, "Notification initialization failed\n");
	441	goto err_out_release_ctlr;
	442	}
	443
db9aaf0b	444	/* Check if slot is occupied */
48fe3915	445	t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
db9aaf0b KK	446	t_slot->hpc_ops->get_adapter_status(t_slot, &value);
	447	if (value) {
	448	if (pciehp_force)
	449	pciehp_enable_slot(t_slot);
	450	} else {
	451	/* Power off slot if not occupied */
	452	if (POWER_CTRL(ctrl)) {
	453	rc = t_slot->hpc_ops->power_off_slot(t_slot);
	454	if (rc)
	455	goto err_out_free_ctrl_slot;
	456	}
1da177e4 LT	457	}
1da177e4 LT	458
1da177e4 LT	459	return 0;
	460
	461	err_out_free_ctrl_slot:
	462	cleanup_slots(ctrl);
a8c2b635	463	err_out_release_ctlr:
1da177e4	464	ctrl->hpc_ops->release_ctlr(ctrl);
1da177e4 LT	465	err_out_none:
	466	return -ENODEV;
	467	}
	468
92333526	469	static void pciehp_remove (struct pcie_device *dev)
1da177e4	470	{
b9708940	471	struct controller *ctrl = get_service_data(dev);
1da177e4	472
92333526 KK	473	cleanup_slots(ctrl);
92333526 KK	474	ctrl->hpc_ops->release_ctlr(ctrl);
1da177e4 LT	475	}
	476
	477	#ifdef CONFIG_PM
3a3c244c	478	static int pciehp_suspend (struct pcie_device *dev)
1da177e4	479	{
7f2feec1	480	dev_info(&dev->device, "%s ENTRY\n", __func__);
1da177e4 LT	481	return 0;
	482	}
	483
	484	static int pciehp_resume (struct pcie_device *dev)
	485	{
7f2feec1	486	dev_info(&dev->device, "%s ENTRY\n", __func__);
cd2fe83a	487	if (pciehp_force) {
b9708940	488	struct controller *ctrl = get_service_data(dev);
cd2fe83a ML	489	struct slot *t_slot;
	490	u8 status;
	491
	492	/* reinitialize the chipset's event detection logic */
c4635eb0	493	pcie_enable_notification(ctrl);
cd2fe83a ML	494
	495	t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
	496
	497	/* Check if slot is occupied */
	498	t_slot->hpc_ops->get_adapter_status(t_slot, &status);
	499	if (status)
	500	pciehp_enable_slot(t_slot);
	501	else
	502	pciehp_disable_slot(t_slot);
	503	}
1da177e4 LT	504	return 0;
1da177e4 LT	505	}
3a3c244c	506	#endif /* PM */
1da177e4	507
1da177e4	508	static struct pcie_port_service_driver hpdriver_portdrv = {
83e9ad54	509	.name = PCIE_MODULE_NAME,
22106368 RW	510	.port_type = PCIE_ANY_PORT,
22106368 RW	511	.service = PCIE_PORT_SERVICE_HP,
1da177e4 LT	512
	513	.probe = pciehp_probe,
	514	.remove = pciehp_remove,
	515
	516	#ifdef CONFIG_PM
	517	.suspend = pciehp_suspend,
	518	.resume = pciehp_resume,
	519	#endif /* PM */
	520	};
	521
	522	static int __init pcied_init(void)
	523	{
	524	int retval = 0;
	525
c9ffa5a5	526	pciehp_firmware_init();
a8a2be94	527	retval = pcie_port_service_register(&hpdriver_portdrv);
	528	dbg("pcie_port_service_register = %d\n", retval);
	529	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
	530	if (retval)
18b341b7	531	dbg("Failure to register service\n");
1da177e4 LT	532	return retval;
	533	}
	534
	535	static void __exit pcied_cleanup(void)
	536	{
	537	dbg("unload_pciehpd()\n");
1da177e4	538	pcie_port_service_unregister(&hpdriver_portdrv);
1da177e4 LT	539	info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
	540	}
	541
	542	module_init(pcied_init);
	543	module_exit(pcied_cleanup);