[mirror_ubuntu-bionic-kernel.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/pm_runtime.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 */
	pm_runtime_get_sync(&ctrl->pcie->port->dev);
	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, "Slot(%s): Power fault\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;
	}
	pm_runtime_put(&ctrl->pcie->port->dev);

	pciehp_green_led_on(p_slot);
	pciehp_set_attention_status(p_slot, 0);
	return 0;

err_exit:
	pm_runtime_put(&ctrl->pcie->port->dev);
	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;

	pm_runtime_get_sync(&ctrl->pcie->port->dev);
	retval = pciehp_unconfigure_device(p_slot);
	pm_runtime_put(&ctrl->pcie->port->dev);
	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, "Slot(%s): Powering off due to button press\n",
				  slot_name(p_slot));
		} else {
			p_slot->state = BLINKINGON_STATE;
			ctrl_info(ctrl, "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, "Slot(%s): Button cancel\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, "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, "Slot(%s): Button ignored\n",
			  slot_name(p_slot));
		break;
	default:
		ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
			 slot_name(p_slot), p_slot->state);
		break;
	}
}

/*
 * 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, "Slot(%s): Link Up event ignored; already powering on\n",
				  slot_name(p_slot));
		} else {
			ctrl_info(ctrl, "Slot(%s): Link Down event queued; 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, "Slot(%s): Link Up event queued; currently getting powered off\n",
				  slot_name(p_slot));
			pciehp_queue_power_work(p_slot, ENABLE_REQ);
		} else {
			ctrl_info(ctrl, "Slot(%s): Link Down event ignored; already powering off\n",
				  slot_name(p_slot));
		}
		break;
	default:
		ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
			 slot_name(p_slot), p_slot->state);
		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:
		pciehp_queue_power_work(p_slot, ENABLE_REQ);
		break;
	case INT_PRESENCE_OFF:
		/*
		 * Regardless of surprise capability, we need to
		 * definitely remove a card that has been pulled out!
		 */
		pciehp_queue_power_work(p_slot, DISABLE_REQ);
		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;
	struct controller *ctrl = p_slot->ctrl;

	pciehp_get_adapter_status(p_slot, &getstatus);
	if (!getstatus) {
		ctrl_info(ctrl, "Slot(%s): No adapter\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, "Slot(%s): Latch open\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, "Slot(%s): Already enabled\n",
				  slot_name(p_slot));
			return 0;
		}
	}

	return board_added(p_slot);
}

/*
 * 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, "Slot(%s): Already disabled\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): Already in powering on state\n",
			  slot_name(p_slot));
		break;
	case BLINKINGOFF_STATE:
	case POWEROFF_STATE:
		ctrl_info(ctrl, "Slot(%s): Already enabled\n",
			  slot_name(p_slot));
		break;
	default:
		ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
			 slot_name(p_slot), p_slot->state);
		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): Already in powering off state\n",
			  slot_name(p_slot));
		break;
	case BLINKINGON_STATE:
	case POWERON_STATE:
		ctrl_info(ctrl, "Slot(%s): Already disabled\n",
			  slot_name(p_slot));
		break;
	default:
		ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
			 slot_name(p_slot), p_slot->state);
		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>
68db9bc8	34	#include <linux/pm_runtime.h>
1da177e4 LT	35	#include <linux/pci.h>
	36	#include "../pci.h"
	37	#include "pciehp.h"
1da177e4	38
5d386e1a	39	static void interrupt_event_handler(struct work_struct *work);
1da177e4	40
4f092fec	41	void pciehp_queue_interrupt_event(struct slot *p_slot, u32 event_type)
49ed2b49	42	{
5d386e1a KK	43	struct event_info *info;
	44
	45	info = kmalloc(sizeof(*info), GFP_ATOMIC);
7d852b68 BH	46	if (!info) {
	47	ctrl_err(p_slot->ctrl, "dropped event %d (ENOMEM)\n", event_type);
	48	return;
	49	}
5d386e1a	50
7d852b68	51	INIT_WORK(&info->work, interrupt_event_handler);
5d386e1a KK	52	info->event_type = event_type;
5d386e1a KK	53	info->p_slot = p_slot;
c2be6f93	54	queue_work(p_slot->wq, &info->work);
49ed2b49 KK	55	}
49ed2b49 KK	56
36ed27b0	57	/* The following routines constitute the bulk of the
1da177e4 LT	58	hotplug controller logic
	59	*/
	60
3c78bc61	61	static void set_slot_off(struct controller ctrl, struct slot pslot)
1da177e4	62	{
1da177e4	63	/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
ae416e6b	64	if (POWER_CTRL(ctrl)) {
6dae6202 BH	65	pciehp_power_off_slot(pslot);
6dae6202 BH	66
c7b4fee3 KK	67	/*
	68	* After turning power off, we must wait for at least 1 second
	69	* before taking any action that relies on power having been
	70	* removed from the slot/adapter.
	71	*/
	72	msleep(1000);
1da177e4 LT	73	}
1da177e4 LT	74
af9ab791 BH	75	pciehp_green_led_off(pslot);
af9ab791 BH	76	pciehp_set_attention_status(pslot, 1);
1da177e4 LT	77	}
	78
	79	/**
	80	* board_added - Called after a board has been added to the system.
26e6c66e	81	* @p_slot: &slot where board is added
1da177e4	82	*
26e6c66e RD	83	* Turns power on for the board.
26e6c66e RD	84	* Configures board.
1da177e4	85	*/
ed6cbcf2	86	static int board_added(struct slot *p_slot)
1da177e4	87	{
44ef4cef	88	int retval = 0;
ca22a5e4	89	struct controller *ctrl = p_slot->ctrl;
385e2491	90	struct pci_bus *parent = ctrl->pcie->port->subordinate;
1da177e4	91
ae416e6b	92	if (POWER_CTRL(ctrl)) {
1da177e4	93	/* Power on slot */
82a9e79e	94	retval = pciehp_power_on_slot(p_slot);
44ef4cef KK	95	if (retval)
44ef4cef KK	96	return retval;
1da177e4	97	}
36ed27b0	98
af9ab791	99	pciehp_green_led_blink(p_slot);
1da177e4	100
44ef4cef	101	/* Check link training status */
68db9bc8	102	pm_runtime_get_sync(&ctrl->pcie->port->dev);
82a9e79e	103	retval = pciehp_check_link_status(ctrl);
44ef4cef	104	if (retval) {
18b341b7	105	ctrl_err(ctrl, "Failed to check link status\n");
5651c48c	106	goto err_exit;
1da177e4 LT	107	}
1da177e4 LT	108
1da177e4	109	/* Check for a power fault */
5651c48c	110	if (ctrl->power_fault_detected \|\| pciehp_query_power_fault(p_slot)) {
6e49b304	111	ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(p_slot));
d9fb42a8	112	retval = -EIO;
71b720c0	113	goto err_exit;
1da177e4 LT	114	}
1da177e4 LT	115
44ef4cef KK	116	retval = pciehp_configure_device(p_slot);
44ef4cef KK	117	if (retval) {
d689f7eb KK	118	ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
d689f7eb KK	119	pci_domain_nr(parent), parent->number);
50277c8b YW	120	if (retval != -EEXIST)
50277c8b YW	121	goto err_exit;
71b720c0	122	}
68db9bc8	123	pm_runtime_put(&ctrl->pcie->port->dev);
1da177e4	124
af9ab791	125	pciehp_green_led_on(p_slot);
8b7c8b46	126	pciehp_set_attention_status(p_slot, 0);
1da177e4	127	return 0;
71b720c0 RS	128
71b720c0 RS	129	err_exit:
68db9bc8	130	pm_runtime_put(&ctrl->pcie->port->dev);
71b720c0	131	set_slot_off(ctrl, p_slot);
44ef4cef	132	return retval;
1da177e4 LT	133	}
1da177e4 LT	134
1da177e4	135	/**
26e6c66e RD	136	* remove_board - Turns off slot and LEDs
26e6c66e RD	137	* @p_slot: slot where board is being removed
1da177e4	138	*/
ed6cbcf2	139	static int remove_board(struct slot *p_slot)
1da177e4	140	{
6dae6202	141	int retval;
ca22a5e4	142	struct controller *ctrl = p_slot->ctrl;
1da177e4	143
68db9bc8	144	pm_runtime_get_sync(&ctrl->pcie->port->dev);
44ef4cef	145	retval = pciehp_unconfigure_device(p_slot);
68db9bc8	146	pm_runtime_put(&ctrl->pcie->port->dev);
44ef4cef KK	147	if (retval)
44ef4cef KK	148	return retval;
1da177e4	149
ae416e6b	150	if (POWER_CTRL(ctrl)) {
6dae6202 BH	151	pciehp_power_off_slot(p_slot);
6dae6202 BH	152
c7b4fee3 KK	153	/*
	154	* After turning power off, we must wait for at least 1 second
	155	* before taking any action that relies on power having been
	156	* removed from the slot/adapter.
	157	*/
	158	msleep(1000);
1da177e4 LT	159	}
1da177e4 LT	160
82a9e79e	161	/* turn off Green LED */
af9ab791	162	pciehp_green_led_off(p_slot);
1da177e4 LT	163	return 0;
	164	}
	165
5d386e1a KK	166	struct power_work_info {
	167	struct slot *p_slot;
	168	struct work_struct work;
c4f2f5e4 RJ	169	unsigned int req;
	170	#define DISABLE_REQ 0
	171	#define ENABLE_REQ 1
5d386e1a	172	};
1da177e4 LT	173
1da177e4 LT	174	/**
26e6c66e RD	175	* pciehp_power_thread - handle pushbutton events
26e6c66e RD	176	* @work: &struct work_struct describing work to be done
1da177e4	177	*
26e6c66e	178	* Scheduled procedure to handle blocking stuff for the pushbuttons.
1da177e4	179	* Handles all pending events and exits.
1da177e4	180	*/
5d386e1a	181	static void pciehp_power_thread(struct work_struct *work)
1da177e4	182	{
5d386e1a KK	183	struct power_work_info *info =
	184	container_of(work, struct power_work_info, work);
	185	struct slot *p_slot = info->p_slot;
50b52fde	186	int ret;
5d386e1a	187
c4f2f5e4 RJ	188	switch (info->req) {
c4f2f5e4 RJ	189	case DISABLE_REQ:
50b52fde	190	mutex_lock(&p_slot->hotplug_lock);
1da177e4	191	pciehp_disable_slot(p_slot);
50b52fde	192	mutex_unlock(&p_slot->hotplug_lock);
5d386e1a	193	mutex_lock(&p_slot->lock);
1da177e4	194	p_slot->state = STATIC_STATE;
5d386e1a	195	mutex_unlock(&p_slot->lock);
c4f2f5e4 RJ	196	break;
c4f2f5e4 RJ	197	case ENABLE_REQ:
50b52fde RJ	198	mutex_lock(&p_slot->hotplug_lock);
	199	ret = pciehp_enable_slot(p_slot);
	200	mutex_unlock(&p_slot->hotplug_lock);
	201	if (ret)
82a9e79e	202	pciehp_green_led_off(p_slot);
5d386e1a	203	mutex_lock(&p_slot->lock);
1da177e4	204	p_slot->state = STATIC_STATE;
c4f2f5e4	205	mutex_unlock(&p_slot->lock);
5d386e1a KK	206	break;
	207	default:
	208	break;
1da177e4 LT	209	}
1da177e4 LT	210
5d386e1a	211	kfree(info);
1da177e4 LT	212	}
1da177e4 LT	213
bee67756	214	static void pciehp_queue_power_work(struct slot *p_slot, int req)
1da177e4	215	{
5d386e1a	216	struct power_work_info *info;
1da177e4	217
bee67756 GR	218	p_slot->state = (req == ENABLE_REQ) ? POWERON_STATE : POWEROFF_STATE;
bee67756 GR	219
5d386e1a KK	220	info = kmalloc(sizeof(*info), GFP_KERNEL);
5d386e1a KK	221	if (!info) {
bee67756 GR	222	ctrl_err(p_slot->ctrl, "no memory to queue %s request\n",
bee67756 GR	223	(req == ENABLE_REQ) ? "poweron" : "poweroff");
1da177e4 LT	224	return;
1da177e4 LT	225	}
5d386e1a KK	226	info->p_slot = p_slot;
5d386e1a KK	227	INIT_WORK(&info->work, pciehp_power_thread);
bee67756 GR	228	info->req = req;
	229	queue_work(p_slot->wq, &info->work);
	230	}
	231
	232	void pciehp_queue_pushbutton_work(struct work_struct *work)
	233	{
	234	struct slot *p_slot = container_of(work, struct slot, work.work);
1da177e4	235
5d386e1a KK	236	mutex_lock(&p_slot->lock);
	237	switch (p_slot->state) {
	238	case BLINKINGOFF_STATE:
bee67756	239	pciehp_queue_power_work(p_slot, DISABLE_REQ);
5d386e1a KK	240	break;
5d386e1a KK	241	case BLINKINGON_STATE:
bee67756	242	pciehp_queue_power_work(p_slot, ENABLE_REQ);
5d386e1a KK	243	break;
5d386e1a KK	244	default:
bee67756	245	break;
1da177e4	246	}
5d386e1a	247	mutex_unlock(&p_slot->lock);
1da177e4 LT	248	}
1da177e4 LT	249
5d386e1a KK	250	/*
	251	* Note: This function must be called with slot->lock held
	252	*/
	253	static void handle_button_press_event(struct slot *p_slot)
1da177e4	254	{
5d386e1a	255	struct controller *ctrl = p_slot->ctrl;
1da177e4	256	u8 getstatus;
1da177e4	257
5d386e1a KK	258	switch (p_slot->state) {
5d386e1a KK	259	case STATIC_STATE:
82a9e79e	260	pciehp_get_power_status(p_slot, &getstatus);
5d386e1a KK	261	if (getstatus) {
5d386e1a KK	262	p_slot->state = BLINKINGOFF_STATE;
6e49b304	263	ctrl_info(ctrl, "Slot(%s): Powering off due to button press\n",
227f0647	264	slot_name(p_slot));
5d386e1a KK	265	} else {
5d386e1a KK	266	p_slot->state = BLINKINGON_STATE;
6e49b304	267	ctrl_info(ctrl, "Slot(%s) Powering on due to button press\n",
227f0647	268	slot_name(p_slot));
5d386e1a KK	269	}
5d386e1a KK	270	/* blink green LED and turn off amber */
af9ab791 BH	271	pciehp_green_led_blink(p_slot);
af9ab791 BH	272	pciehp_set_attention_status(p_slot, 0);
c2be6f93	273	queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
5d386e1a KK	274	break;
	275	case BLINKINGOFF_STATE:
	276	case BLINKINGON_STATE:
	277	/*
	278	* Cancel if we are still blinking; this means that we
	279	* press the attention again before the 5 sec. limit
	280	* expires to cancel hot-add or hot-remove
	281	*/
6e49b304	282	ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(p_slot));
5d386e1a	283	cancel_delayed_work(&p_slot->work);
9cad7f58	284	if (p_slot->state == BLINKINGOFF_STATE)
af9ab791	285	pciehp_green_led_on(p_slot);
9cad7f58	286	else
af9ab791	287	pciehp_green_led_off(p_slot);
af9ab791	288	pciehp_set_attention_status(p_slot, 0);
6e49b304	289	ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n",
227f0647	290	slot_name(p_slot));
5d386e1a KK	291	p_slot->state = STATIC_STATE;
	292	break;
	293	case POWEROFF_STATE:
	294	case POWERON_STATE:
	295	/*
	296	* Ignore if the slot is on power-on or power-off state;
	297	* this means that the previous attention button action
	298	* to hot-add or hot-remove is undergoing
	299	*/
6e49b304 BH	300	ctrl_info(ctrl, "Slot(%s): Button ignored\n",
6e49b304 BH	301	slot_name(p_slot));
5d386e1a KK	302	break;
5d386e1a KK	303	default:
6e49b304 BH	304	ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
6e49b304 BH	305	slot_name(p_slot), p_slot->state);
5d386e1a	306	break;
1da177e4 LT	307	}
	308	}
	309
e48f1b67 RJ	310	/*
	311	* Note: This function must be called with slot->lock held
	312	*/
	313	static void handle_link_event(struct slot *p_slot, u32 event)
	314	{
	315	struct controller *ctrl = p_slot->ctrl;
e48f1b67 RJ	316
	317	switch (p_slot->state) {
	318	case BLINKINGON_STATE:
	319	case BLINKINGOFF_STATE:
	320	cancel_delayed_work(&p_slot->work);
	321	/* Fall through */
	322	case STATIC_STATE:
bee67756 GR	323	pciehp_queue_power_work(p_slot, event == INT_LINK_UP ?
bee67756 GR	324	ENABLE_REQ : DISABLE_REQ);
e48f1b67 RJ	325	break;
	326	case POWERON_STATE:
	327	if (event == INT_LINK_UP) {
6e49b304	328	ctrl_info(ctrl, "Slot(%s): Link Up event ignored; already powering on\n",
e48f1b67	329	slot_name(p_slot));
e48f1b67	330	} else {
6e49b304	331	ctrl_info(ctrl, "Slot(%s): Link Down event queued; currently getting powered on\n",
e48f1b67	332	slot_name(p_slot));
bee67756	333	pciehp_queue_power_work(p_slot, DISABLE_REQ);
e48f1b67 RJ	334	}
	335	break;
	336	case POWEROFF_STATE:
	337	if (event == INT_LINK_UP) {
6e49b304	338	ctrl_info(ctrl, "Slot(%s): Link Up event queued; currently getting powered off\n",
e48f1b67	339	slot_name(p_slot));
bee67756	340	pciehp_queue_power_work(p_slot, ENABLE_REQ);
e48f1b67	341	} else {
6e49b304	342	ctrl_info(ctrl, "Slot(%s): Link Down event ignored; already powering off\n",
e48f1b67	343	slot_name(p_slot));
e48f1b67 RJ	344	}
	345	break;
	346	default:
6e49b304 BH	347	ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
6e49b304 BH	348	slot_name(p_slot), p_slot->state);
e48f1b67 RJ	349	break;
	350	}
	351	}
	352
5d386e1a KK	353	static void interrupt_event_handler(struct work_struct *work)
	354	{
	355	struct event_info *info = container_of(work, struct event_info, work);
	356	struct slot *p_slot = info->p_slot;
	357	struct controller *ctrl = p_slot->ctrl;
	358
	359	mutex_lock(&p_slot->lock);
	360	switch (info->event_type) {
	361	case INT_BUTTON_PRESS:
	362	handle_button_press_event(p_slot);
	363	break;
	364	case INT_POWER_FAULT:
ae416e6b	365	if (!POWER_CTRL(ctrl))
5d386e1a	366	break;
af9ab791 BH	367	pciehp_set_attention_status(p_slot, 1);
af9ab791 BH	368	pciehp_green_led_off(p_slot);
5d386e1a KK	369	break;
5d386e1a KK	370	case INT_PRESENCE_ON:
69bd3c5b	371	pciehp_queue_power_work(p_slot, ENABLE_REQ);
2b3940b6 RJ	372	break;
	373	case INT_PRESENCE_OFF:
	374	/*
	375	* Regardless of surprise capability, we need to
	376	* definitely remove a card that has been pulled out!
	377	*/
69bd3c5b	378	pciehp_queue_power_work(p_slot, DISABLE_REQ);
5d386e1a	379	break;
e48f1b67 RJ	380	case INT_LINK_UP:
	381	case INT_LINK_DOWN:
	382	handle_link_event(p_slot, info->event_type);
	383	break;
5d386e1a	384	default:
5d386e1a KK	385	break;
	386	}
	387	mutex_unlock(&p_slot->lock);
	388
	389	kfree(info);
	390	}
	391
50b52fde RJ	392	/*
	393	* Note: This function must be called with slot->hotplug_lock held
	394	*/
1da177e4 LT	395	int pciehp_enable_slot(struct slot *p_slot)
	396	{
	397	u8 getstatus = 0;
7f2feec1	398	struct controller *ctrl = p_slot->ctrl;
1da177e4	399
6dae6202 BH	400	pciehp_get_adapter_status(p_slot, &getstatus);
6dae6202 BH	401	if (!getstatus) {
6e49b304	402	ctrl_info(ctrl, "Slot(%s): No adapter\n", slot_name(p_slot));
c9d86d76	403	return -ENODEV;
1da177e4	404	}
ae416e6b	405	if (MRL_SENS(p_slot->ctrl)) {
6dae6202 BH	406	pciehp_get_latch_status(p_slot, &getstatus);
6dae6202 BH	407	if (getstatus) {
6e49b304	408	ctrl_info(ctrl, "Slot(%s): Latch open\n",
18b341b7	409	slot_name(p_slot));
c9d86d76	410	return -ENODEV;
1da177e4 LT	411	}
1da177e4 LT	412	}
36ed27b0	413
ae416e6b	414	if (POWER_CTRL(p_slot->ctrl)) {
6dae6202 BH	415	pciehp_get_power_status(p_slot, &getstatus);
6dae6202 BH	416	if (getstatus) {
6e49b304	417	ctrl_info(ctrl, "Slot(%s): Already enabled\n",
18b341b7	418	slot_name(p_slot));
c4ae2ade	419	return 0;
1da177e4 LT	420	}
1da177e4 LT	421	}
1da177e4	422
29a654e5	423	return board_added(p_slot);
1da177e4 LT	424	}
1da177e4 LT	425
50b52fde RJ	426	/*
	427	* Note: This function must be called with slot->hotplug_lock held
	428	*/
1da177e4 LT	429	int pciehp_disable_slot(struct slot *p_slot)
1da177e4 LT	430	{
1da177e4	431	u8 getstatus = 0;
7f2feec1	432	struct controller *ctrl = p_slot->ctrl;
1da177e4 LT	433
	434	if (!p_slot->ctrl)
	435	return 1;
	436
ae416e6b	437	if (POWER_CTRL(p_slot->ctrl)) {
6dae6202 BH	438	pciehp_get_power_status(p_slot, &getstatus);
6dae6202 BH	439	if (!getstatus) {
6e49b304	440	ctrl_info(ctrl, "Slot(%s): Already disabled\n",
18b341b7	441	slot_name(p_slot));
c9d86d76	442	return -EINVAL;
1da177e4 LT	443	}
	444	}
	445
445f7985	446	return remove_board(p_slot);
1da177e4 LT	447	}
1da177e4 LT	448
5d386e1a KK	449	int pciehp_sysfs_enable_slot(struct slot *p_slot)
	450	{
	451	int retval = -ENODEV;
7f2feec1	452	struct controller *ctrl = p_slot->ctrl;
5d386e1a KK	453
	454	mutex_lock(&p_slot->lock);
	455	switch (p_slot->state) {
	456	case BLINKINGON_STATE:
	457	cancel_delayed_work(&p_slot->work);
	458	case STATIC_STATE:
	459	p_slot->state = POWERON_STATE;
	460	mutex_unlock(&p_slot->lock);
50b52fde	461	mutex_lock(&p_slot->hotplug_lock);
5d386e1a	462	retval = pciehp_enable_slot(p_slot);
50b52fde	463	mutex_unlock(&p_slot->hotplug_lock);
5d386e1a KK	464	mutex_lock(&p_slot->lock);
	465	p_slot->state = STATIC_STATE;
	466	break;
	467	case POWERON_STATE:
6e49b304	468	ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
e1acb24f	469	slot_name(p_slot));
5d386e1a KK	470	break;
	471	case BLINKINGOFF_STATE:
	472	case POWEROFF_STATE:
6e49b304	473	ctrl_info(ctrl, "Slot(%s): Already enabled\n",
e1acb24f	474	slot_name(p_slot));
5d386e1a KK	475	break;
5d386e1a KK	476	default:
6e49b304 BH	477	ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
6e49b304 BH	478	slot_name(p_slot), p_slot->state);
5d386e1a KK	479	break;
	480	}
	481	mutex_unlock(&p_slot->lock);
	482
	483	return retval;
	484	}
	485
	486	int pciehp_sysfs_disable_slot(struct slot *p_slot)
	487	{
	488	int retval = -ENODEV;
7f2feec1	489	struct controller *ctrl = p_slot->ctrl;
5d386e1a KK	490
	491	mutex_lock(&p_slot->lock);
	492	switch (p_slot->state) {
	493	case BLINKINGOFF_STATE:
	494	cancel_delayed_work(&p_slot->work);
	495	case STATIC_STATE:
	496	p_slot->state = POWEROFF_STATE;
	497	mutex_unlock(&p_slot->lock);
64609eaa	498	mutex_lock(&p_slot->hotplug_lock);
5d386e1a	499	retval = pciehp_disable_slot(p_slot);
64609eaa	500	mutex_unlock(&p_slot->hotplug_lock);
5d386e1a KK	501	mutex_lock(&p_slot->lock);
	502	p_slot->state = STATIC_STATE;
	503	break;
	504	case POWEROFF_STATE:
6e49b304	505	ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
e1acb24f	506	slot_name(p_slot));
5d386e1a KK	507	break;
	508	case BLINKINGON_STATE:
	509	case POWERON_STATE:
6e49b304	510	ctrl_info(ctrl, "Slot(%s): Already disabled\n",
e1acb24f	511	slot_name(p_slot));
5d386e1a KK	512	break;
5d386e1a KK	513	default:
6e49b304 BH	514	ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
6e49b304 BH	515	slot_name(p_slot), p_slot->state);
5d386e1a KK	516	break;
	517	}
	518	mutex_unlock(&p_slot->lock);
	519
	520	return retval;
	521	}