[linux-2.6-block.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);
}

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

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
			 __func__);
		return;
	}
	info->p_slot = p_slot;
	INIT_WORK(&info->work, pciehp_power_thread);

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case BLINKINGOFF_STATE:
		p_slot->state = POWEROFF_STATE;
		info->req = DISABLE_REQ;
		break;
	case BLINKINGON_STATE:
		p_slot->state = POWERON_STATE;
		info->req = ENABLE_REQ;
		break;
	default:
		kfree(info);
		goto out;
	}
	queue_work(p_slot->wq, &info->work);
 out:
	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;
	struct power_work_info *info;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
			 __func__);
		return;
	}
	info->p_slot = p_slot;
	INIT_WORK(&info->work, pciehp_power_thread);

	pciehp_get_adapter_status(p_slot, &getstatus);
	if (!getstatus) {
		p_slot->state = POWEROFF_STATE;
		info->req = DISABLE_REQ;
	} else {
		p_slot->state = POWERON_STATE;
		info->req = ENABLE_REQ;
	}

	queue_work(p_slot->wq, &info->work);
}

/*
 * 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;
	struct power_work_info *info;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
			 __func__);
		return;
	}
	info->p_slot = p_slot;
	info->req = event == INT_LINK_UP ? ENABLE_REQ : DISABLE_REQ;
	INIT_WORK(&info->work, pciehp_power_thread);

	switch (p_slot->state) {
	case BLINKINGON_STATE:
	case BLINKINGOFF_STATE:
		cancel_delayed_work(&p_slot->work);
		/* Fall through */
	case STATIC_STATE:
		p_slot->state = event == INT_LINK_UP ?
		    POWERON_STATE : POWEROFF_STATE;
		queue_work(p_slot->wq, &info->work);
		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));
			kfree(info);
		} else {
			ctrl_info(ctrl,
				  "Link Down event queued on slot(%s): currently getting powered on\n",
				  slot_name(p_slot));
			p_slot->state = POWEROFF_STATE;
			queue_work(p_slot->wq, &info->work);
		}
		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));
			p_slot->state = POWERON_STATE;
			queue_work(p_slot->wq, &info->work);
		} else {
			ctrl_info(ctrl,
				  "Link Down event ignored on slot(%s): already powering off\n",
				  slot_name(p_slot));
			kfree(info);
		}
		break;
	default:
		ctrl_err(ctrl, "ignoring invalid state %#x on slot(%s)\n",
			 p_slot->state, slot_name(p_slot));
		kfree(info);
		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);
		retval = pciehp_disable_slot(p_slot);
		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
e325e1f0	207	void pciehp_queue_pushbutton_work(struct work_struct *work)
1da177e4	208	{
5d386e1a KK	209	struct slot *p_slot = container_of(work, struct slot, work.work);
5d386e1a KK	210	struct power_work_info *info;
1da177e4	211
5d386e1a KK	212	info = kmalloc(sizeof(*info), GFP_KERNEL);
5d386e1a KK	213	if (!info) {
7f2feec1 TI	214	ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
7f2feec1 TI	215	__func__);
1da177e4 LT	216	return;
1da177e4 LT	217	}
5d386e1a KK	218	info->p_slot = p_slot;
5d386e1a KK	219	INIT_WORK(&info->work, pciehp_power_thread);
1da177e4	220
5d386e1a KK	221	mutex_lock(&p_slot->lock);
	222	switch (p_slot->state) {
	223	case BLINKINGOFF_STATE:
1da177e4	224	p_slot->state = POWEROFF_STATE;
c4f2f5e4	225	info->req = DISABLE_REQ;
5d386e1a KK	226	break;
5d386e1a KK	227	case BLINKINGON_STATE:
1da177e4	228	p_slot->state = POWERON_STATE;
c4f2f5e4	229	info->req = ENABLE_REQ;
5d386e1a KK	230	break;
5d386e1a KK	231	default:
6fcaf17a	232	kfree(info);
5d386e1a	233	goto out;
1da177e4	234	}
c2be6f93	235	queue_work(p_slot->wq, &info->work);
5d386e1a KK	236	out:
5d386e1a KK	237	mutex_unlock(&p_slot->lock);
1da177e4 LT	238	}
1da177e4 LT	239
5d386e1a KK	240	/*
	241	* Note: This function must be called with slot->lock held
	242	*/
	243	static void handle_button_press_event(struct slot *p_slot)
1da177e4	244	{
5d386e1a	245	struct controller *ctrl = p_slot->ctrl;
1da177e4	246	u8 getstatus;
1da177e4	247
5d386e1a KK	248	switch (p_slot->state) {
5d386e1a KK	249	case STATIC_STATE:
82a9e79e	250	pciehp_get_power_status(p_slot, &getstatus);
5d386e1a KK	251	if (getstatus) {
5d386e1a KK	252	p_slot->state = BLINKINGOFF_STATE;
227f0647 RD	253	ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n",
227f0647 RD	254	slot_name(p_slot));
5d386e1a KK	255	} else {
5d386e1a KK	256	p_slot->state = BLINKINGON_STATE;
227f0647 RD	257	ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n",
227f0647 RD	258	slot_name(p_slot));
5d386e1a KK	259	}
5d386e1a KK	260	/* blink green LED and turn off amber */
af9ab791 BH	261	pciehp_green_led_blink(p_slot);
af9ab791 BH	262	pciehp_set_attention_status(p_slot, 0);
c2be6f93	263	queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
5d386e1a KK	264	break;
	265	case BLINKINGOFF_STATE:
	266	case BLINKINGON_STATE:
	267	/*
	268	* Cancel if we are still blinking; this means that we
	269	* press the attention again before the 5 sec. limit
	270	* expires to cancel hot-add or hot-remove
	271	*/
e1acb24f	272	ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
5d386e1a	273	cancel_delayed_work(&p_slot->work);
9cad7f58	274	if (p_slot->state == BLINKINGOFF_STATE)
af9ab791	275	pciehp_green_led_on(p_slot);
9cad7f58	276	else
af9ab791	277	pciehp_green_led_off(p_slot);
af9ab791	278	pciehp_set_attention_status(p_slot, 0);
227f0647 RD	279	ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n",
227f0647 RD	280	slot_name(p_slot));
5d386e1a KK	281	p_slot->state = STATIC_STATE;
	282	break;
	283	case POWEROFF_STATE:
	284	case POWERON_STATE:
	285	/*
	286	* Ignore if the slot is on power-on or power-off state;
	287	* this means that the previous attention button action
	288	* to hot-add or hot-remove is undergoing
	289	*/
e1acb24f	290	ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
5d386e1a KK	291	break;
5d386e1a KK	292	default:
3784e0c6	293	ctrl_warn(ctrl, "ignoring invalid state %#x\n", p_slot->state);
5d386e1a	294	break;
1da177e4 LT	295	}
	296	}
	297
5d386e1a KK	298	/*
	299	* Note: This function must be called with slot->lock held
	300	*/
	301	static void handle_surprise_event(struct slot *p_slot)
	302	{
	303	u8 getstatus;
	304	struct power_work_info *info;
	305
	306	info = kmalloc(sizeof(*info), GFP_KERNEL);
	307	if (!info) {
7f2feec1 TI	308	ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
7f2feec1 TI	309	__func__);
5d386e1a KK	310	return;
	311	}
	312	info->p_slot = p_slot;
	313	INIT_WORK(&info->work, pciehp_power_thread);
	314
82a9e79e	315	pciehp_get_adapter_status(p_slot, &getstatus);
c4f2f5e4	316	if (!getstatus) {
5d386e1a	317	p_slot->state = POWEROFF_STATE;
c4f2f5e4 RJ	318	info->req = DISABLE_REQ;
c4f2f5e4 RJ	319	} else {
5d386e1a	320	p_slot->state = POWERON_STATE;
c4f2f5e4 RJ	321	info->req = ENABLE_REQ;
c4f2f5e4 RJ	322	}
5d386e1a	323
c2be6f93	324	queue_work(p_slot->wq, &info->work);
5d386e1a KK	325	}
5d386e1a KK	326
e48f1b67 RJ	327	/*
	328	* Note: This function must be called with slot->lock held
	329	*/
	330	static void handle_link_event(struct slot *p_slot, u32 event)
	331	{
	332	struct controller *ctrl = p_slot->ctrl;
	333	struct power_work_info *info;
	334
	335	info = kmalloc(sizeof(*info), GFP_KERNEL);
	336	if (!info) {
	337	ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
	338	__func__);
	339	return;
	340	}
	341	info->p_slot = p_slot;
c4f2f5e4	342	info->req = event == INT_LINK_UP ? ENABLE_REQ : DISABLE_REQ;
e48f1b67 RJ	343	INIT_WORK(&info->work, pciehp_power_thread);
	344
	345	switch (p_slot->state) {
	346	case BLINKINGON_STATE:
	347	case BLINKINGOFF_STATE:
	348	cancel_delayed_work(&p_slot->work);
	349	/* Fall through */
	350	case STATIC_STATE:
	351	p_slot->state = event == INT_LINK_UP ?
	352	POWERON_STATE : POWEROFF_STATE;
	353	queue_work(p_slot->wq, &info->work);
	354	break;
	355	case POWERON_STATE:
	356	if (event == INT_LINK_UP) {
	357	ctrl_info(ctrl,
	358	"Link Up event ignored on slot(%s): already powering on\n",
	359	slot_name(p_slot));
	360	kfree(info);
	361	} else {
	362	ctrl_info(ctrl,
	363	"Link Down event queued on slot(%s): currently getting powered on\n",
	364	slot_name(p_slot));
	365	p_slot->state = POWEROFF_STATE;
	366	queue_work(p_slot->wq, &info->work);
	367	}
	368	break;
	369	case POWEROFF_STATE:
	370	if (event == INT_LINK_UP) {
	371	ctrl_info(ctrl,
	372	"Link Up event queued on slot(%s): currently getting powered off\n",
	373	slot_name(p_slot));
	374	p_slot->state = POWERON_STATE;
	375	queue_work(p_slot->wq, &info->work);
	376	} else {
	377	ctrl_info(ctrl,
	378	"Link Down event ignored on slot(%s): already powering off\n",
	379	slot_name(p_slot));
	380	kfree(info);
	381	}
	382	break;
	383	default:
3784e0c6 BH	384	ctrl_err(ctrl, "ignoring invalid state %#x on slot(%s)\n",
3784e0c6 BH	385	p_slot->state, slot_name(p_slot));
e48f1b67 RJ	386	kfree(info);
	387	break;
	388	}
	389	}
	390
5d386e1a KK	391	static void interrupt_event_handler(struct work_struct *work)
	392	{
	393	struct event_info *info = container_of(work, struct event_info, work);
	394	struct slot *p_slot = info->p_slot;
	395	struct controller *ctrl = p_slot->ctrl;
	396
	397	mutex_lock(&p_slot->lock);
	398	switch (info->event_type) {
	399	case INT_BUTTON_PRESS:
	400	handle_button_press_event(p_slot);
	401	break;
	402	case INT_POWER_FAULT:
ae416e6b	403	if (!POWER_CTRL(ctrl))
5d386e1a	404	break;
af9ab791 BH	405	pciehp_set_attention_status(p_slot, 1);
af9ab791 BH	406	pciehp_green_led_off(p_slot);
5d386e1a KK	407	break;
5d386e1a KK	408	case INT_PRESENCE_ON:
2b3940b6 RJ	409	handle_surprise_event(p_slot);
	410	break;
	411	case INT_PRESENCE_OFF:
	412	/*
	413	* Regardless of surprise capability, we need to
	414	* definitely remove a card that has been pulled out!
	415	*/
5d386e1a KK	416	handle_surprise_event(p_slot);
5d386e1a KK	417	break;
e48f1b67 RJ	418	case INT_LINK_UP:
	419	case INT_LINK_DOWN:
	420	handle_link_event(p_slot, info->event_type);
	421	break;
5d386e1a	422	default:
5d386e1a KK	423	break;
	424	}
	425	mutex_unlock(&p_slot->lock);
	426
	427	kfree(info);
	428	}
	429
50b52fde RJ	430	/*
	431	* Note: This function must be called with slot->hotplug_lock held
	432	*/
1da177e4 LT	433	int pciehp_enable_slot(struct slot *p_slot)
	434	{
	435	u8 getstatus = 0;
	436	int rc;
7f2feec1	437	struct controller *ctrl = p_slot->ctrl;
1da177e4	438
6dae6202 BH	439	pciehp_get_adapter_status(p_slot, &getstatus);
6dae6202 BH	440	if (!getstatus) {
18b341b7	441	ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
c9d86d76	442	return -ENODEV;
1da177e4	443	}
ae416e6b	444	if (MRL_SENS(p_slot->ctrl)) {
6dae6202 BH	445	pciehp_get_latch_status(p_slot, &getstatus);
6dae6202 BH	446	if (getstatus) {
18b341b7 TI	447	ctrl_info(ctrl, "Latch open on slot(%s)\n",
18b341b7 TI	448	slot_name(p_slot));
c9d86d76	449	return -ENODEV;
1da177e4 LT	450	}
1da177e4 LT	451	}
36ed27b0	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 enabled on slot(%s)\n",
18b341b7 TI	457	slot_name(p_slot));
c9d86d76	458	return -EINVAL;
1da177e4 LT	459	}
1da177e4 LT	460	}
1da177e4	461
82a9e79e	462	pciehp_get_latch_status(p_slot, &getstatus);
1da177e4	463
ca22a5e4	464	rc = board_added(p_slot);
9cad7f58	465	if (rc)
82a9e79e	466	pciehp_get_latch_status(p_slot, &getstatus);
9cad7f58	467
1da177e4 LT	468	return rc;
	469	}
	470
50b52fde RJ	471	/*
	472	* Note: This function must be called with slot->hotplug_lock held
	473	*/
1da177e4 LT	474	int pciehp_disable_slot(struct slot *p_slot)
1da177e4 LT	475	{
1da177e4	476	u8 getstatus = 0;
7f2feec1	477	struct controller *ctrl = p_slot->ctrl;
1da177e4 LT	478
	479	if (!p_slot->ctrl)
	480	return 1;
	481
ae416e6b	482	if (POWER_CTRL(p_slot->ctrl)) {
6dae6202 BH	483	pciehp_get_power_status(p_slot, &getstatus);
6dae6202 BH	484	if (!getstatus) {
18b341b7 TI	485	ctrl_info(ctrl, "Already disabled on slot(%s)\n",
18b341b7 TI	486	slot_name(p_slot));
c9d86d76	487	return -EINVAL;
1da177e4 LT	488	}
	489	}
	490
445f7985	491	return remove_board(p_slot);
1da177e4 LT	492	}
1da177e4 LT	493
5d386e1a KK	494	int pciehp_sysfs_enable_slot(struct slot *p_slot)
	495	{
	496	int retval = -ENODEV;
7f2feec1	497	struct controller *ctrl = p_slot->ctrl;
5d386e1a KK	498
	499	mutex_lock(&p_slot->lock);
	500	switch (p_slot->state) {
	501	case BLINKINGON_STATE:
	502	cancel_delayed_work(&p_slot->work);
	503	case STATIC_STATE:
	504	p_slot->state = POWERON_STATE;
	505	mutex_unlock(&p_slot->lock);
50b52fde	506	mutex_lock(&p_slot->hotplug_lock);
5d386e1a	507	retval = pciehp_enable_slot(p_slot);
50b52fde	508	mutex_unlock(&p_slot->hotplug_lock);
5d386e1a KK	509	mutex_lock(&p_slot->lock);
	510	p_slot->state = STATIC_STATE;
	511	break;
	512	case POWERON_STATE:
7f2feec1	513	ctrl_info(ctrl, "Slot %s is already in powering on state\n",
e1acb24f	514	slot_name(p_slot));
5d386e1a KK	515	break;
	516	case BLINKINGOFF_STATE:
	517	case POWEROFF_STATE:
e1acb24f AC	518	ctrl_info(ctrl, "Already enabled on slot %s\n",
e1acb24f AC	519	slot_name(p_slot));
5d386e1a KK	520	break;
5d386e1a KK	521	default:
3784e0c6 BH	522	ctrl_err(ctrl, "invalid state %#x on slot %s\n",
3784e0c6 BH	523	p_slot->state, slot_name(p_slot));
5d386e1a KK	524	break;
	525	}
	526	mutex_unlock(&p_slot->lock);
	527
	528	return retval;
	529	}
	530
	531	int pciehp_sysfs_disable_slot(struct slot *p_slot)
	532	{
	533	int retval = -ENODEV;
7f2feec1	534	struct controller *ctrl = p_slot->ctrl;
5d386e1a KK	535
	536	mutex_lock(&p_slot->lock);
	537	switch (p_slot->state) {
	538	case BLINKINGOFF_STATE:
	539	cancel_delayed_work(&p_slot->work);
	540	case STATIC_STATE:
	541	p_slot->state = POWEROFF_STATE;
	542	mutex_unlock(&p_slot->lock);
	543	retval = pciehp_disable_slot(p_slot);
	544	mutex_lock(&p_slot->lock);
	545	p_slot->state = STATIC_STATE;
	546	break;
	547	case POWEROFF_STATE:
7f2feec1	548	ctrl_info(ctrl, "Slot %s is already in powering off state\n",
e1acb24f	549	slot_name(p_slot));
5d386e1a KK	550	break;
	551	case BLINKINGON_STATE:
	552	case POWERON_STATE:
e1acb24f AC	553	ctrl_info(ctrl, "Already disabled on slot %s\n",
e1acb24f AC	554	slot_name(p_slot));
5d386e1a KK	555	break;
5d386e1a KK	556	default:
3784e0c6 BH	557	ctrl_err(ctrl, "invalid state %#x on slot %s\n",
3784e0c6 BH	558	p_slot->state, slot_name(p_slot));
5d386e1a KK	559	break;
	560	}
	561	mutex_unlock(&p_slot->lock);
	562
	563	return retval;
	564	}