[deliverable/linux.git] / drivers / pci / hotplug / pciehp_ctrl.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/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include "../pci.h"
#include "pciehp.h"

static void interrupt_event_handler(struct work_struct *work);

void pciehp_queue_interrupt_event(struct slot *p_slot, u32 event_type)
{
	struct event_info *info;

	info = kmalloc(sizeof(*info), GFP_ATOMIC);
	if (!info) {
		ctrl_err(p_slot->ctrl, "dropped event %d (ENOMEM)\n", event_type);
		return;
	}

	INIT_WORK(&info->work, interrupt_event_handler);
	info->event_type = event_type;
	info->p_slot = p_slot;
	queue_work(p_slot->wq, &info->work);
}

/* The following routines constitute the bulk of the
   hotplug controller logic
 */

static void set_slot_off(struct controller *ctrl, struct slot *pslot)
{
	/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
	if (POWER_CTRL(ctrl)) {
		pciehp_power_off_slot(pslot);

		/*
		 * After turning power off, we must wait for at least 1 second
		 * before taking any action that relies on power having been
		 * removed from the slot/adapter.
		 */
		msleep(1000);
	}

	pciehp_green_led_off(pslot);
	pciehp_set_attention_status(pslot, 1);
}

/**
 * board_added - Called after a board has been added to the system.
 * @p_slot: &slot where board is added
 *
 * Turns power on for the board.
 * Configures board.
 */
static int board_added(struct slot *p_slot)
{
	int retval = 0;
	struct controller *ctrl = p_slot->ctrl;
	struct pci_bus *parent = ctrl->pcie->port->subordinate;

	if (POWER_CTRL(ctrl)) {
		/* Power on slot */
		retval = pciehp_power_on_slot(p_slot);
		if (retval)
			return retval;
	}

	pciehp_green_led_blink(p_slot);

	/* Check link training status */
	retval = pciehp_check_link_status(ctrl);
	if (retval) {
		ctrl_err(ctrl, "Failed to check link status\n");
		goto err_exit;
	}

	/* Check for a power fault */
	if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
		ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
		retval = -EIO;
		goto err_exit;
	}

	retval = pciehp_configure_device(p_slot);
	if (retval) {
		ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
			 pci_domain_nr(parent), parent->number);
		if (retval != -EEXIST)
			goto err_exit;
	}

	pciehp_green_led_on(p_slot);
	return 0;

err_exit:
	set_slot_off(ctrl, p_slot);
	return retval;
}

/**
 * remove_board - Turns off slot and LEDs
 * @p_slot: slot where board is being removed
 */
static int remove_board(struct slot *p_slot)
{
	int retval;
	struct controller *ctrl = p_slot->ctrl;

	retval = pciehp_unconfigure_device(p_slot);
	if (retval)
		return retval;

	if (POWER_CTRL(ctrl)) {
		pciehp_power_off_slot(p_slot);

		/*
		 * After turning power off, we must wait for at least 1 second
		 * before taking any action that relies on power having been
		 * removed from the slot/adapter.
		 */
		msleep(1000);
	}

	/* turn off Green LED */
	pciehp_green_led_off(p_slot);
	return 0;
}

struct power_work_info {
	struct slot *p_slot;
	struct work_struct work;
	unsigned int req;
#define DISABLE_REQ 0
#define ENABLE_REQ  1
};

/**
 * pciehp_power_thread - handle pushbutton events
 * @work: &struct work_struct describing work to be done
 *
 * Scheduled procedure to handle blocking stuff for the pushbuttons.
 * Handles all pending events and exits.
 */
static void pciehp_power_thread(struct work_struct *work)
{
	struct power_work_info *info =
		container_of(work, struct power_work_info, work);
	struct slot *p_slot = info->p_slot;
	int ret;

	switch (info->req) {
	case DISABLE_REQ:
		mutex_lock(&p_slot->hotplug_lock);
		pciehp_disable_slot(p_slot);
		mutex_unlock(&p_slot->hotplug_lock);
		mutex_lock(&p_slot->lock);
		p_slot->state = STATIC_STATE;
		mutex_unlock(&p_slot->lock);
		break;
	case ENABLE_REQ:
		mutex_lock(&p_slot->hotplug_lock);
		ret = pciehp_enable_slot(p_slot);
		mutex_unlock(&p_slot->hotplug_lock);
		if (ret)
			pciehp_green_led_off(p_slot);
		mutex_lock(&p_slot->lock);
		p_slot->state = STATIC_STATE;
		mutex_unlock(&p_slot->lock);
		break;
	default:
		break;
	}

	kfree(info);
}

static void pciehp_queue_power_work(struct slot *p_slot, int req)
{
	struct power_work_info *info;

	p_slot->state = (req == ENABLE_REQ) ? POWERON_STATE : POWEROFF_STATE;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		ctrl_err(p_slot->ctrl, "no memory to queue %s request\n",
			 (req == ENABLE_REQ) ? "poweron" : "poweroff");
		return;
	}
	info->p_slot = p_slot;
	INIT_WORK(&info->work, pciehp_power_thread);
	info->req = req;
	queue_work(p_slot->wq, &info->work);
}

void pciehp_queue_pushbutton_work(struct work_struct *work)
{
	struct slot *p_slot = container_of(work, struct slot, work.work);

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case BLINKINGOFF_STATE:
		pciehp_queue_power_work(p_slot, DISABLE_REQ);
		break;
	case BLINKINGON_STATE:
		pciehp_queue_power_work(p_slot, ENABLE_REQ);
		break;
	default:
		break;
	}
	mutex_unlock(&p_slot->lock);
}

/*
 * Note: This function must be called with slot->lock held
 */
static void handle_button_press_event(struct slot *p_slot)
{
	struct controller *ctrl = p_slot->ctrl;
	u8 getstatus;

	switch (p_slot->state) {
	case STATIC_STATE:
		pciehp_get_power_status(p_slot, &getstatus);
		if (getstatus) {
			p_slot->state = BLINKINGOFF_STATE;
			ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n",
				  slot_name(p_slot));
		} else {
			p_slot->state = BLINKINGON_STATE;
			ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n",
				  slot_name(p_slot));
		}
		/* blink green LED and turn off amber */
		pciehp_green_led_blink(p_slot);
		pciehp_set_attention_status(p_slot, 0);
		queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
		break;
	case BLINKINGOFF_STATE:
	case BLINKINGON_STATE:
		/*
		 * Cancel if we are still blinking; this means that we
		 * press the attention again before the 5 sec. limit
		 * expires to cancel hot-add or hot-remove
		 */
		ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
		cancel_delayed_work(&p_slot->work);
		if (p_slot->state == BLINKINGOFF_STATE)
			pciehp_green_led_on(p_slot);
		else
			pciehp_green_led_off(p_slot);
		pciehp_set_attention_status(p_slot, 0);
		ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n",
			  slot_name(p_slot));
		p_slot->state = STATIC_STATE;
		break;
	case POWEROFF_STATE:
	case POWERON_STATE:
		/*
		 * Ignore if the slot is on power-on or power-off state;
		 * this means that the previous attention button action
		 * to hot-add or hot-remove is undergoing
		 */
		ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
		break;
	default:
		ctrl_warn(ctrl, "ignoring invalid state %#x\n", p_slot->state);
		break;
	}
}

/*
 * Note: This function must be called with slot->lock held
 */
static void handle_surprise_event(struct slot *p_slot)
{
	u8 getstatus;

	pciehp_get_adapter_status(p_slot, &getstatus);
	if (!getstatus)
		pciehp_queue_power_work(p_slot, DISABLE_REQ);
	else
		pciehp_queue_power_work(p_slot, ENABLE_REQ);
}

/*
 * Note: This function must be called with slot->lock held
 */
static void handle_link_event(struct slot *p_slot, u32 event)
{
	struct controller *ctrl = p_slot->ctrl;

	switch (p_slot->state) {
	case BLINKINGON_STATE:
	case BLINKINGOFF_STATE:
		cancel_delayed_work(&p_slot->work);
		/* Fall through */
	case STATIC_STATE:
		pciehp_queue_power_work(p_slot, event == INT_LINK_UP ?
					ENABLE_REQ : DISABLE_REQ);
		break;
	case POWERON_STATE:
		if (event == INT_LINK_UP) {
			ctrl_info(ctrl,
				  "Link Up event ignored on slot(%s): already powering on\n",
				  slot_name(p_slot));
		} else {
			ctrl_info(ctrl,
				  "Link Down event queued on slot(%s): currently getting powered on\n",
				  slot_name(p_slot));
			pciehp_queue_power_work(p_slot, DISABLE_REQ);
		}
		break;
	case POWEROFF_STATE:
		if (event == INT_LINK_UP) {
			ctrl_info(ctrl,
				  "Link Up event queued on slot(%s): currently getting powered off\n",
				  slot_name(p_slot));
			pciehp_queue_power_work(p_slot, ENABLE_REQ);
		} else {
			ctrl_info(ctrl,
				  "Link Down event ignored on slot(%s): already powering off\n",
				  slot_name(p_slot));
		}
		break;
	default:
		ctrl_err(ctrl, "ignoring invalid state %#x on slot(%s)\n",
			 p_slot->state, slot_name(p_slot));
		break;
	}
}

static void interrupt_event_handler(struct work_struct *work)
{
	struct event_info *info = container_of(work, struct event_info, work);
	struct slot *p_slot = info->p_slot;
	struct controller *ctrl = p_slot->ctrl;

	mutex_lock(&p_slot->lock);
	switch (info->event_type) {
	case INT_BUTTON_PRESS:
		handle_button_press_event(p_slot);
		break;
	case INT_POWER_FAULT:
		if (!POWER_CTRL(ctrl))
			break;
		pciehp_set_attention_status(p_slot, 1);
		pciehp_green_led_off(p_slot);
		break;
	case INT_PRESENCE_ON:
		handle_surprise_event(p_slot);
		break;
	case INT_PRESENCE_OFF:
		/*
		 * Regardless of surprise capability, we need to
		 * definitely remove a card that has been pulled out!
		 */
		handle_surprise_event(p_slot);
		break;
	case INT_LINK_UP:
	case INT_LINK_DOWN:
		handle_link_event(p_slot, info->event_type);
		break;
	default:
		break;
	}
	mutex_unlock(&p_slot->lock);

	kfree(info);
}

/*
 * Note: This function must be called with slot->hotplug_lock held
 */
int pciehp_enable_slot(struct slot *p_slot)
{
	u8 getstatus = 0;
	int rc;
	struct controller *ctrl = p_slot->ctrl;

	pciehp_get_adapter_status(p_slot, &getstatus);
	if (!getstatus) {
		ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
		return -ENODEV;
	}
	if (MRL_SENS(p_slot->ctrl)) {
		pciehp_get_latch_status(p_slot, &getstatus);
		if (getstatus) {
			ctrl_info(ctrl, "Latch open on slot(%s)\n",
				  slot_name(p_slot));
			return -ENODEV;
		}
	}

	if (POWER_CTRL(p_slot->ctrl)) {
		pciehp_get_power_status(p_slot, &getstatus);
		if (getstatus) {
			ctrl_info(ctrl, "Already enabled on slot(%s)\n",
				  slot_name(p_slot));
			return -EINVAL;
		}
	}

	pciehp_get_latch_status(p_slot, &getstatus);

	rc = board_added(p_slot);
	if (rc)
		pciehp_get_latch_status(p_slot, &getstatus);

	return rc;
}

/*
 * Note: This function must be called with slot->hotplug_lock held
 */
int pciehp_disable_slot(struct slot *p_slot)
{
	u8 getstatus = 0;
	struct controller *ctrl = p_slot->ctrl;

	if (!p_slot->ctrl)
		return 1;

	if (POWER_CTRL(p_slot->ctrl)) {
		pciehp_get_power_status(p_slot, &getstatus);
		if (!getstatus) {
			ctrl_info(ctrl, "Already disabled on slot(%s)\n",
				  slot_name(p_slot));
			return -EINVAL;
		}
	}

	return remove_board(p_slot);
}

int pciehp_sysfs_enable_slot(struct slot *p_slot)
{
	int retval = -ENODEV;
	struct controller *ctrl = p_slot->ctrl;

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case BLINKINGON_STATE:
		cancel_delayed_work(&p_slot->work);
	case STATIC_STATE:
		p_slot->state = POWERON_STATE;
		mutex_unlock(&p_slot->lock);
		mutex_lock(&p_slot->hotplug_lock);
		retval = pciehp_enable_slot(p_slot);
		mutex_unlock(&p_slot->hotplug_lock);
		mutex_lock(&p_slot->lock);
		p_slot->state = STATIC_STATE;
		break;
	case POWERON_STATE:
		ctrl_info(ctrl, "Slot %s is already in powering on state\n",
			  slot_name(p_slot));
		break;
	case BLINKINGOFF_STATE:
	case POWEROFF_STATE:
		ctrl_info(ctrl, "Already enabled on slot %s\n",
			  slot_name(p_slot));
		break;
	default:
		ctrl_err(ctrl, "invalid state %#x on slot %s\n",
			 p_slot->state, slot_name(p_slot));
		break;
	}
	mutex_unlock(&p_slot->lock);

	return retval;
}

int pciehp_sysfs_disable_slot(struct slot *p_slot)
{
	int retval = -ENODEV;
	struct controller *ctrl = p_slot->ctrl;

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case BLINKINGOFF_STATE:
		cancel_delayed_work(&p_slot->work);
	case STATIC_STATE:
		p_slot->state = POWEROFF_STATE;
		mutex_unlock(&p_slot->lock);
		mutex_lock(&p_slot->hotplug_lock);
		retval = pciehp_disable_slot(p_slot);
		mutex_unlock(&p_slot->hotplug_lock);
		mutex_lock(&p_slot->lock);
		p_slot->state = STATIC_STATE;
		break;
	case POWEROFF_STATE:
		ctrl_info(ctrl, "Slot %s is already in powering off state\n",
			  slot_name(p_slot));
		break;
	case BLINKINGON_STATE:
	case POWERON_STATE:
		ctrl_info(ctrl, "Already disabled on slot %s\n",
			  slot_name(p_slot));
		break;
	default:
		ctrl_err(ctrl, "invalid state %#x on slot %s\n",
			 p_slot->state, slot_name(p_slot));
		break;
	}
	mutex_unlock(&p_slot->lock);

	return retval;
}
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/kernel.h>
	32	#include <linux/types.h>
5a0e3ad6	33	#include <linux/slab.h>
1da177e4 LT	34	#include <linux/pci.h>
	35	#include "../pci.h"
	36	#include "pciehp.h"
1da177e4	37
5d386e1a	38	static void interrupt_event_handler(struct work_struct *work);
1da177e4	39
4f092fec	40	void pciehp_queue_interrupt_event(struct slot *p_slot, u32 event_type)
49ed2b49	41	{
5d386e1a KK	42	struct event_info *info;
	43
	44	info = kmalloc(sizeof(*info), GFP_ATOMIC);
7d852b68 BH	45	if (!info) {
	46	ctrl_err(p_slot->ctrl, "dropped event %d (ENOMEM)\n", event_type);
	47	return;
	48	}
5d386e1a	49
7d852b68	50	INIT_WORK(&info->work, interrupt_event_handler);
5d386e1a KK	51	info->event_type = event_type;
5d386e1a KK	52	info->p_slot = p_slot;
c2be6f93	53	queue_work(p_slot->wq, &info->work);
49ed2b49 KK	54	}
49ed2b49 KK	55
36ed27b0	56	/* The following routines constitute the bulk of the
1da177e4 LT	57	hotplug controller logic
	58	*/
	59
3c78bc61	60	static void set_slot_off(struct controller ctrl, struct slot pslot)
1da177e4	61	{
1da177e4	62	/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
ae416e6b	63	if (POWER_CTRL(ctrl)) {
6dae6202 BH	64	pciehp_power_off_slot(pslot);
6dae6202 BH	65
c7b4fee3 KK	66	/*
	67	* After turning power off, we must wait for at least 1 second
	68	* before taking any action that relies on power having been
	69	* removed from the slot/adapter.
	70	*/
	71	msleep(1000);
1da177e4 LT	72	}
1da177e4 LT	73
af9ab791 BH	74	pciehp_green_led_off(pslot);
af9ab791 BH	75	pciehp_set_attention_status(pslot, 1);
1da177e4 LT	76	}
	77
	78	/**
	79	* board_added - Called after a board has been added to the system.
26e6c66e	80	* @p_slot: &slot where board is added
1da177e4	81	*
26e6c66e RD	82	* Turns power on for the board.
26e6c66e RD	83	* Configures board.
1da177e4	84	*/
ed6cbcf2	85	static int board_added(struct slot *p_slot)
1da177e4	86	{
44ef4cef	87	int retval = 0;
ca22a5e4	88	struct controller *ctrl = p_slot->ctrl;
385e2491	89	struct pci_bus *parent = ctrl->pcie->port->subordinate;
1da177e4	90
ae416e6b	91	if (POWER_CTRL(ctrl)) {
1da177e4	92	/* Power on slot */
82a9e79e	93	retval = pciehp_power_on_slot(p_slot);
44ef4cef KK	94	if (retval)
44ef4cef KK	95	return retval;
1da177e4	96	}
36ed27b0	97
af9ab791	98	pciehp_green_led_blink(p_slot);
1da177e4	99
44ef4cef	100	/* Check link training status */
82a9e79e	101	retval = pciehp_check_link_status(ctrl);
44ef4cef	102	if (retval) {
18b341b7	103	ctrl_err(ctrl, "Failed to check link status\n");
5651c48c	104	goto err_exit;
1da177e4 LT	105	}
1da177e4 LT	106
1da177e4	107	/* Check for a power fault */
5651c48c KK	108	if (ctrl->power_fault_detected \|\| pciehp_query_power_fault(p_slot)) {
5651c48c KK	109	ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
d9fb42a8	110	retval = -EIO;
71b720c0	111	goto err_exit;
1da177e4 LT	112	}
1da177e4 LT	113
44ef4cef KK	114	retval = pciehp_configure_device(p_slot);
44ef4cef KK	115	if (retval) {
d689f7eb KK	116	ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
d689f7eb KK	117	pci_domain_nr(parent), parent->number);
50277c8b YW	118	if (retval != -EEXIST)
50277c8b YW	119	goto err_exit;
71b720c0	120	}
1da177e4	121
af9ab791	122	pciehp_green_led_on(p_slot);
1da177e4	123	return 0;
71b720c0	124
	125	err_exit:
	126	set_slot_off(ctrl, p_slot);
44ef4cef	127	return retval;
1da177e4 LT	128	}
1da177e4 LT	129
1da177e4	130	/**
26e6c66e RD	131	* remove_board - Turns off slot and LEDs
26e6c66e RD	132	* @p_slot: slot where board is being removed
1da177e4	133	*/
ed6cbcf2	134	static int remove_board(struct slot *p_slot)
1da177e4	135	{
6dae6202	136	int retval;
ca22a5e4	137	struct controller *ctrl = p_slot->ctrl;
1da177e4	138
44ef4cef KK	139	retval = pciehp_unconfigure_device(p_slot);
	140	if (retval)
	141	return retval;
1da177e4	142
ae416e6b	143	if (POWER_CTRL(ctrl)) {
6dae6202 BH	144	pciehp_power_off_slot(p_slot);
6dae6202 BH	145
c7b4fee3 KK	146	/*
	147	* After turning power off, we must wait for at least 1 second
	148	* before taking any action that relies on power having been
	149	* removed from the slot/adapter.
	150	*/
	151	msleep(1000);
1da177e4 LT	152	}
1da177e4 LT	153
82a9e79e	154	/* turn off Green LED */
af9ab791	155	pciehp_green_led_off(p_slot);
1da177e4 LT	156	return 0;
	157	}
	158
5d386e1a KK	159	struct power_work_info {
	160	struct slot *p_slot;
	161	struct work_struct work;
c4f2f5e4 RJ	162	unsigned int req;
	163	#define DISABLE_REQ 0
	164	#define ENABLE_REQ 1
5d386e1a	165	};
1da177e4 LT	166
1da177e4 LT	167	/**
26e6c66e RD	168	* pciehp_power_thread - handle pushbutton events
26e6c66e RD	169	* @work: &struct work_struct describing work to be done
1da177e4	170	*
26e6c66e	171	* Scheduled procedure to handle blocking stuff for the pushbuttons.
1da177e4	172	* Handles all pending events and exits.
1da177e4	173	*/
5d386e1a	174	static void pciehp_power_thread(struct work_struct *work)
1da177e4	175	{
5d386e1a KK	176	struct power_work_info *info =
	177	container_of(work, struct power_work_info, work);
	178	struct slot *p_slot = info->p_slot;
50b52fde	179	int ret;
5d386e1a	180
c4f2f5e4 RJ	181	switch (info->req) {
c4f2f5e4 RJ	182	case DISABLE_REQ:
50b52fde	183	mutex_lock(&p_slot->hotplug_lock);
1da177e4	184	pciehp_disable_slot(p_slot);
50b52fde	185	mutex_unlock(&p_slot->hotplug_lock);
5d386e1a	186	mutex_lock(&p_slot->lock);
1da177e4	187	p_slot->state = STATIC_STATE;
5d386e1a	188	mutex_unlock(&p_slot->lock);
c4f2f5e4 RJ	189	break;
c4f2f5e4 RJ	190	case ENABLE_REQ:
50b52fde RJ	191	mutex_lock(&p_slot->hotplug_lock);
	192	ret = pciehp_enable_slot(p_slot);
	193	mutex_unlock(&p_slot->hotplug_lock);
	194	if (ret)
82a9e79e	195	pciehp_green_led_off(p_slot);
5d386e1a	196	mutex_lock(&p_slot->lock);
1da177e4	197	p_slot->state = STATIC_STATE;
c4f2f5e4	198	mutex_unlock(&p_slot->lock);
5d386e1a KK	199	break;
	200	default:
	201	break;
1da177e4 LT	202	}
1da177e4 LT	203
5d386e1a	204	kfree(info);
1da177e4 LT	205	}
1da177e4 LT	206
bee67756	207	static void pciehp_queue_power_work(struct slot *p_slot, int req)
1da177e4	208	{
5d386e1a	209	struct power_work_info *info;
1da177e4	210
bee67756 GR	211	p_slot->state = (req == ENABLE_REQ) ? POWERON_STATE : POWEROFF_STATE;
bee67756 GR	212
5d386e1a KK	213	info = kmalloc(sizeof(*info), GFP_KERNEL);
5d386e1a KK	214	if (!info) {
bee67756 GR	215	ctrl_err(p_slot->ctrl, "no memory to queue %s request\n",
bee67756 GR	216	(req == ENABLE_REQ) ? "poweron" : "poweroff");
1da177e4 LT	217	return;
1da177e4 LT	218	}
5d386e1a KK	219	info->p_slot = p_slot;
5d386e1a KK	220	INIT_WORK(&info->work, pciehp_power_thread);
bee67756 GR	221	info->req = req;
	222	queue_work(p_slot->wq, &info->work);
	223	}
	224
	225	void pciehp_queue_pushbutton_work(struct work_struct *work)
	226	{
	227	struct slot *p_slot = container_of(work, struct slot, work.work);
1da177e4	228
5d386e1a KK	229	mutex_lock(&p_slot->lock);
	230	switch (p_slot->state) {
	231	case BLINKINGOFF_STATE:
bee67756	232	pciehp_queue_power_work(p_slot, DISABLE_REQ);
5d386e1a KK	233	break;
5d386e1a KK	234	case BLINKINGON_STATE:
bee67756	235	pciehp_queue_power_work(p_slot, ENABLE_REQ);
5d386e1a KK	236	break;
5d386e1a KK	237	default:
bee67756	238	break;
1da177e4	239	}
5d386e1a	240	mutex_unlock(&p_slot->lock);
1da177e4 LT	241	}
1da177e4 LT	242
5d386e1a KK	243	/*
	244	* Note: This function must be called with slot->lock held
	245	*/
	246	static void handle_button_press_event(struct slot *p_slot)
1da177e4	247	{
5d386e1a	248	struct controller *ctrl = p_slot->ctrl;
1da177e4	249	u8 getstatus;
1da177e4	250
5d386e1a KK	251	switch (p_slot->state) {
5d386e1a KK	252	case STATIC_STATE:
82a9e79e	253	pciehp_get_power_status(p_slot, &getstatus);
5d386e1a KK	254	if (getstatus) {
5d386e1a KK	255	p_slot->state = BLINKINGOFF_STATE;
227f0647 RD	256	ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n",
227f0647 RD	257	slot_name(p_slot));
5d386e1a KK	258	} else {
5d386e1a KK	259	p_slot->state = BLINKINGON_STATE;
227f0647 RD	260	ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n",
227f0647 RD	261	slot_name(p_slot));
5d386e1a KK	262	}
5d386e1a KK	263	/* blink green LED and turn off amber */
af9ab791 BH	264	pciehp_green_led_blink(p_slot);
af9ab791 BH	265	pciehp_set_attention_status(p_slot, 0);
c2be6f93	266	queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
5d386e1a KK	267	break;
	268	case BLINKINGOFF_STATE:
	269	case BLINKINGON_STATE:
	270	/*
	271	* Cancel if we are still blinking; this means that we
	272	* press the attention again before the 5 sec. limit
	273	* expires to cancel hot-add or hot-remove
	274	*/
e1acb24f	275	ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
5d386e1a	276	cancel_delayed_work(&p_slot->work);
9cad7f58	277	if (p_slot->state == BLINKINGOFF_STATE)
af9ab791	278	pciehp_green_led_on(p_slot);
9cad7f58	279	else
af9ab791	280	pciehp_green_led_off(p_slot);
af9ab791	281	pciehp_set_attention_status(p_slot, 0);
227f0647 RD	282	ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n",
227f0647 RD	283	slot_name(p_slot));
5d386e1a KK	284	p_slot->state = STATIC_STATE;
	285	break;
	286	case POWEROFF_STATE:
	287	case POWERON_STATE:
	288	/*
	289	* Ignore if the slot is on power-on or power-off state;
	290	* this means that the previous attention button action
	291	* to hot-add or hot-remove is undergoing
	292	*/
e1acb24f	293	ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
5d386e1a KK	294	break;
5d386e1a KK	295	default:
3784e0c6	296	ctrl_warn(ctrl, "ignoring invalid state %#x\n", p_slot->state);
5d386e1a	297	break;
1da177e4 LT	298	}
	299	}
	300
5d386e1a KK	301	/*
	302	* Note: This function must be called with slot->lock held
	303	*/
	304	static void handle_surprise_event(struct slot *p_slot)
	305	{
	306	u8 getstatus;
5d386e1a	307
82a9e79e	308	pciehp_get_adapter_status(p_slot, &getstatus);
bee67756 GR	309	if (!getstatus)
	310	pciehp_queue_power_work(p_slot, DISABLE_REQ);
	311	else
	312	pciehp_queue_power_work(p_slot, ENABLE_REQ);
5d386e1a KK	313	}
5d386e1a KK	314
e48f1b67 RJ	315	/*
	316	* Note: This function must be called with slot->lock held
	317	*/
	318	static void handle_link_event(struct slot *p_slot, u32 event)
	319	{
	320	struct controller *ctrl = p_slot->ctrl;
e48f1b67 RJ	321
	322	switch (p_slot->state) {
	323	case BLINKINGON_STATE:
	324	case BLINKINGOFF_STATE:
	325	cancel_delayed_work(&p_slot->work);
	326	/* Fall through */
	327	case STATIC_STATE:
bee67756 GR	328	pciehp_queue_power_work(p_slot, event == INT_LINK_UP ?
bee67756 GR	329	ENABLE_REQ : DISABLE_REQ);
e48f1b67 RJ	330	break;
	331	case POWERON_STATE:
	332	if (event == INT_LINK_UP) {
	333	ctrl_info(ctrl,
	334	"Link Up event ignored on slot(%s): already powering on\n",
	335	slot_name(p_slot));
e48f1b67 RJ	336	} else {
	337	ctrl_info(ctrl,
	338	"Link Down event queued on slot(%s): currently getting powered on\n",
	339	slot_name(p_slot));
bee67756	340	pciehp_queue_power_work(p_slot, DISABLE_REQ);
e48f1b67 RJ	341	}
	342	break;
	343	case POWEROFF_STATE:
	344	if (event == INT_LINK_UP) {
	345	ctrl_info(ctrl,
	346	"Link Up event queued on slot(%s): currently getting powered off\n",
	347	slot_name(p_slot));
bee67756	348	pciehp_queue_power_work(p_slot, ENABLE_REQ);
e48f1b67 RJ	349	} else {
	350	ctrl_info(ctrl,
	351	"Link Down event ignored on slot(%s): already powering off\n",
	352	slot_name(p_slot));
e48f1b67 RJ	353	}
	354	break;
	355	default:
3784e0c6 BH	356	ctrl_err(ctrl, "ignoring invalid state %#x on slot(%s)\n",
3784e0c6 BH	357	p_slot->state, slot_name(p_slot));
e48f1b67 RJ	358	break;
	359	}
	360	}
	361
5d386e1a KK	362	static void interrupt_event_handler(struct work_struct *work)
	363	{
	364	struct event_info *info = container_of(work, struct event_info, work);
	365	struct slot *p_slot = info->p_slot;
	366	struct controller *ctrl = p_slot->ctrl;
	367
	368	mutex_lock(&p_slot->lock);
	369	switch (info->event_type) {
	370	case INT_BUTTON_PRESS:
	371	handle_button_press_event(p_slot);
	372	break;
	373	case INT_POWER_FAULT:
ae416e6b	374	if (!POWER_CTRL(ctrl))
5d386e1a	375	break;
af9ab791 BH	376	pciehp_set_attention_status(p_slot, 1);
af9ab791 BH	377	pciehp_green_led_off(p_slot);
5d386e1a KK	378	break;
5d386e1a KK	379	case INT_PRESENCE_ON:
2b3940b6 RJ	380	handle_surprise_event(p_slot);
	381	break;
	382	case INT_PRESENCE_OFF:
	383	/*
	384	* Regardless of surprise capability, we need to
	385	* definitely remove a card that has been pulled out!
	386	*/
5d386e1a KK	387	handle_surprise_event(p_slot);
5d386e1a KK	388	break;
e48f1b67 RJ	389	case INT_LINK_UP:
	390	case INT_LINK_DOWN:
	391	handle_link_event(p_slot, info->event_type);
	392	break;
5d386e1a	393	default:
5d386e1a KK	394	break;
	395	}
	396	mutex_unlock(&p_slot->lock);
	397
	398	kfree(info);
	399	}
	400
50b52fde RJ	401	/*
	402	* Note: This function must be called with slot->hotplug_lock held
	403	*/
1da177e4 LT	404	int pciehp_enable_slot(struct slot *p_slot)
	405	{
	406	u8 getstatus = 0;
	407	int rc;
7f2feec1	408	struct controller *ctrl = p_slot->ctrl;
1da177e4	409
6dae6202 BH	410	pciehp_get_adapter_status(p_slot, &getstatus);
6dae6202 BH	411	if (!getstatus) {
18b341b7	412	ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
c9d86d76	413	return -ENODEV;
1da177e4	414	}
ae416e6b	415	if (MRL_SENS(p_slot->ctrl)) {
6dae6202 BH	416	pciehp_get_latch_status(p_slot, &getstatus);
6dae6202 BH	417	if (getstatus) {
18b341b7 TI	418	ctrl_info(ctrl, "Latch open on slot(%s)\n",
18b341b7 TI	419	slot_name(p_slot));
c9d86d76	420	return -ENODEV;
1da177e4 LT	421	}
1da177e4 LT	422	}
36ed27b0	423
ae416e6b	424	if (POWER_CTRL(p_slot->ctrl)) {
6dae6202 BH	425	pciehp_get_power_status(p_slot, &getstatus);
6dae6202 BH	426	if (getstatus) {
18b341b7 TI	427	ctrl_info(ctrl, "Already enabled on slot(%s)\n",
18b341b7 TI	428	slot_name(p_slot));
c9d86d76	429	return -EINVAL;
1da177e4 LT	430	}
1da177e4 LT	431	}
1da177e4	432
82a9e79e	433	pciehp_get_latch_status(p_slot, &getstatus);
1da177e4	434
ca22a5e4	435	rc = board_added(p_slot);
9cad7f58	436	if (rc)
82a9e79e	437	pciehp_get_latch_status(p_slot, &getstatus);
9cad7f58	438
1da177e4 LT	439	return rc;
	440	}
	441
50b52fde RJ	442	/*
	443	* Note: This function must be called with slot->hotplug_lock held
	444	*/
1da177e4 LT	445	int pciehp_disable_slot(struct slot *p_slot)
1da177e4 LT	446	{
1da177e4	447	u8 getstatus = 0;
7f2feec1	448	struct controller *ctrl = p_slot->ctrl;
1da177e4 LT	449
	450	if (!p_slot->ctrl)
	451	return 1;
	452
ae416e6b	453	if (POWER_CTRL(p_slot->ctrl)) {
6dae6202 BH	454	pciehp_get_power_status(p_slot, &getstatus);
6dae6202 BH	455	if (!getstatus) {
18b341b7 TI	456	ctrl_info(ctrl, "Already disabled on slot(%s)\n",
18b341b7 TI	457	slot_name(p_slot));
c9d86d76	458	return -EINVAL;
1da177e4 LT	459	}
	460	}
	461
445f7985	462	return remove_board(p_slot);
1da177e4 LT	463	}
1da177e4 LT	464
5d386e1a KK	465	int pciehp_sysfs_enable_slot(struct slot *p_slot)
	466	{
	467	int retval = -ENODEV;
7f2feec1	468	struct controller *ctrl = p_slot->ctrl;
5d386e1a KK	469
	470	mutex_lock(&p_slot->lock);
	471	switch (p_slot->state) {
	472	case BLINKINGON_STATE:
	473	cancel_delayed_work(&p_slot->work);
	474	case STATIC_STATE:
	475	p_slot->state = POWERON_STATE;
	476	mutex_unlock(&p_slot->lock);
50b52fde	477	mutex_lock(&p_slot->hotplug_lock);
5d386e1a	478	retval = pciehp_enable_slot(p_slot);
50b52fde	479	mutex_unlock(&p_slot->hotplug_lock);
5d386e1a KK	480	mutex_lock(&p_slot->lock);
	481	p_slot->state = STATIC_STATE;
	482	break;
	483	case POWERON_STATE:
7f2feec1	484	ctrl_info(ctrl, "Slot %s is already in powering on state\n",
e1acb24f	485	slot_name(p_slot));
5d386e1a KK	486	break;
	487	case BLINKINGOFF_STATE:
	488	case POWEROFF_STATE:
e1acb24f AC	489	ctrl_info(ctrl, "Already enabled on slot %s\n",
e1acb24f AC	490	slot_name(p_slot));
5d386e1a KK	491	break;
5d386e1a KK	492	default:
3784e0c6 BH	493	ctrl_err(ctrl, "invalid state %#x on slot %s\n",
3784e0c6 BH	494	p_slot->state, slot_name(p_slot));
5d386e1a KK	495	break;
	496	}
	497	mutex_unlock(&p_slot->lock);
	498
	499	return retval;
	500	}
	501
	502	int pciehp_sysfs_disable_slot(struct slot *p_slot)
	503	{
	504	int retval = -ENODEV;
7f2feec1	505	struct controller *ctrl = p_slot->ctrl;
5d386e1a KK	506
	507	mutex_lock(&p_slot->lock);
	508	switch (p_slot->state) {
	509	case BLINKINGOFF_STATE:
	510	cancel_delayed_work(&p_slot->work);
	511	case STATIC_STATE:
	512	p_slot->state = POWEROFF_STATE;
	513	mutex_unlock(&p_slot->lock);
64609eaa	514	mutex_lock(&p_slot->hotplug_lock);
5d386e1a	515	retval = pciehp_disable_slot(p_slot);
64609eaa	516	mutex_unlock(&p_slot->hotplug_lock);
5d386e1a KK	517	mutex_lock(&p_slot->lock);
	518	p_slot->state = STATIC_STATE;
	519	break;
	520	case POWEROFF_STATE:
7f2feec1	521	ctrl_info(ctrl, "Slot %s is already in powering off state\n",
e1acb24f	522	slot_name(p_slot));
5d386e1a KK	523	break;
	524	case BLINKINGON_STATE:
	525	case POWERON_STATE:
e1acb24f AC	526	ctrl_info(ctrl, "Already disabled on slot %s\n",
e1acb24f AC	527	slot_name(p_slot));
5d386e1a KK	528	break;
5d386e1a KK	529	default:
3784e0c6 BH	530	ctrl_err(ctrl, "invalid state %#x on slot %s\n",
3784e0c6 BH	531	p_slot->state, slot_name(p_slot));
5d386e1a KK	532	break;
	533	}
	534	mutex_unlock(&p_slot->lock);
	535
	536	return retval;
	537	}