[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);

static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
{
	struct event_info *info;

	info = kmalloc(sizeof(*info), GFP_ATOMIC);
	if (!info)
		return -ENOMEM;

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

	queue_work(pciehp_wq, &info->work);

	return 0;
}

u8 pciehp_handle_attention_button(struct slot *p_slot)
{
	u32 event_type;
	struct controller *ctrl = p_slot->ctrl;

	/* Attention Button Change */
	ctrl_dbg(ctrl, "Attention button interrupt received\n");

	/*
	 *  Button pressed - See if need to TAKE ACTION!!!
	 */
	ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
	event_type = INT_BUTTON_PRESS;

	queue_interrupt_event(p_slot, event_type);

	return 0;
}

u8 pciehp_handle_switch_change(struct slot *p_slot)
{
	u8 getstatus;
	u32 event_type;
	struct controller *ctrl = p_slot->ctrl;

	/* Switch Change */
	ctrl_dbg(ctrl, "Switch interrupt received\n");

	pciehp_get_latch_status(p_slot, &getstatus);
	if (getstatus) {
		/*
		 * Switch opened
		 */
		ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
		event_type = INT_SWITCH_OPEN;
	} else {
		/*
		 *  Switch closed
		 */
		ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
		event_type = INT_SWITCH_CLOSE;
	}

	queue_interrupt_event(p_slot, event_type);

	return 1;
}

u8 pciehp_handle_presence_change(struct slot *p_slot)
{
	u32 event_type;
	u8 presence_save;
	struct controller *ctrl = p_slot->ctrl;

	/* Presence Change */
	ctrl_dbg(ctrl, "Presence/Notify input change\n");

	/* Switch is open, assume a presence change
	 * Save the presence state
	 */
	pciehp_get_adapter_status(p_slot, &presence_save);
	if (presence_save) {
		/*
		 * Card Present
		 */
		ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot));
		event_type = INT_PRESENCE_ON;
	} else {
		/*
		 * Not Present
		 */
		ctrl_info(ctrl, "Card not present on Slot(%s)\n",
			  slot_name(p_slot));
		event_type = INT_PRESENCE_OFF;
	}

	queue_interrupt_event(p_slot, event_type);

	return 1;
}

u8 pciehp_handle_power_fault(struct slot *p_slot)
{
	u32 event_type;
	struct controller *ctrl = p_slot->ctrl;

	/* power fault */
	ctrl_dbg(ctrl, "Power fault interrupt received\n");
	ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
	event_type = INT_POWER_FAULT;
	ctrl_info(ctrl, "Power fault bit %x set\n", 0);
	queue_interrupt_event(p_slot, event_type);

	return 1;
}

/* 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)) {
		if (pciehp_power_off_slot(pslot)) {
			ctrl_err(ctrl,
				 "Issue of Slot Power Off command failed\n");
			return;
		}
		/*
		 * 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);
	}

	if (PWR_LED(ctrl))
		pciehp_green_led_off(pslot);

	if (ATTN_LED(ctrl)) {
		if (pciehp_set_attention_status(pslot, 1)) {
			ctrl_err(ctrl,
				 "Issue of Set Attention Led command failed\n");
			return;
		}
	}
}

/**
 * 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;
	}

	if (PWR_LED(ctrl))
		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);
		goto err_exit;
	}

	if (PWR_LED(ctrl))
		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 = 0;
	struct controller *ctrl = p_slot->ctrl;

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

	if (POWER_CTRL(ctrl)) {
		/* power off slot */
		retval = pciehp_power_off_slot(p_slot);
		if (retval) {
			ctrl_err(ctrl,
				 "Issue of Slot Disable command failed\n");
			return retval;
		}
		/*
		 * 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 */
	if (PWR_LED(ctrl))
		pciehp_green_led_off(p_slot);

	return 0;
}

struct power_work_info {
	struct slot *p_slot;
	struct work_struct work;
};

/**
 * 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;

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case POWEROFF_STATE:
		mutex_unlock(&p_slot->lock);
		ctrl_dbg(p_slot->ctrl,
			 "Disabling domain:bus:device=%04x:%02x:00\n",
			 pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
			 p_slot->ctrl->pcie->port->subordinate->number);
		pciehp_disable_slot(p_slot);
		mutex_lock(&p_slot->lock);
		p_slot->state = STATIC_STATE;
		break;
	case POWERON_STATE:
		mutex_unlock(&p_slot->lock);
		if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl))
			pciehp_green_led_off(p_slot);
		mutex_lock(&p_slot->lock);
		p_slot->state = STATIC_STATE;
		break;
	default:
		break;
	}
	mutex_unlock(&p_slot->lock);

	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;
		break;
	case BLINKINGON_STATE:
		p_slot->state = POWERON_STATE;
		break;
	default:
		kfree(info);
		goto out;
	}
	queue_work(pciehp_ordered_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 */
		if (PWR_LED(ctrl))
			pciehp_green_led_blink(p_slot);
		if (ATTN_LED(ctrl))
			pciehp_set_attention_status(p_slot, 0);

		queue_delayed_work(pciehp_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) {
			if (PWR_LED(ctrl))
				pciehp_green_led_on(p_slot);
		} else {
			if (PWR_LED(ctrl))
				pciehp_green_led_off(p_slot);
		}
		if (ATTN_LED(ctrl))
			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, "Not a valid state\n");
		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;
	else
		p_slot->state = POWERON_STATE;

	queue_work(pciehp_ordered_wq, &info->work);
}

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;
		if (ATTN_LED(ctrl))
			pciehp_set_attention_status(p_slot, 1);
		if (PWR_LED(ctrl))
			pciehp_green_led_off(p_slot);
		break;
	case INT_PRESENCE_ON:
	case INT_PRESENCE_OFF:
		if (!HP_SUPR_RM(ctrl))
			break;
		ctrl_dbg(ctrl, "Surprise Removal\n");
		handle_surprise_event(p_slot);
		break;
	default:
		break;
	}
	mutex_unlock(&p_slot->lock);

	kfree(info);
}

int pciehp_enable_slot(struct slot *p_slot)
{
	u8 getstatus = 0;
	int rc;
	struct controller *ctrl = p_slot->ctrl;

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

	if (POWER_CTRL(p_slot->ctrl)) {
		rc = pciehp_get_power_status(p_slot, &getstatus);
		if (rc || 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;
}


int pciehp_disable_slot(struct slot *p_slot)
{
	u8 getstatus = 0;
	int ret = 0;
	struct controller *ctrl = p_slot->ctrl;

	if (!p_slot->ctrl)
		return 1;

	if (!HP_SUPR_RM(p_slot->ctrl)) {
		ret = pciehp_get_adapter_status(p_slot, &getstatus);
		if (ret || !getstatus) {
			ctrl_info(ctrl, "No adapter on slot(%s)\n",
				  slot_name(p_slot));
			return -ENODEV;
		}
	}

	if (MRL_SENS(p_slot->ctrl)) {
		ret = pciehp_get_latch_status(p_slot, &getstatus);
		if (ret || getstatus) {
			ctrl_info(ctrl, "Latch open on slot(%s)\n",
				  slot_name(p_slot));
			return -ENODEV;
		}
	}

	if (POWER_CTRL(p_slot->ctrl)) {
		ret = pciehp_get_power_status(p_slot, &getstatus);
		if (ret || !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);
		retval = pciehp_enable_slot(p_slot);
		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, "Not a valid state on slot %s\n",
			 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, "Not a valid state on slot %s\n",
			 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
5d386e1a	40	static int 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);
	45	if (!info)
	46	return -ENOMEM;
	47
	48	info->event_type = event_type;
	49	info->p_slot = p_slot;
	50	INIT_WORK(&info->work, interrupt_event_handler);
	51
a827ea30	52	queue_work(pciehp_wq, &info->work);
5d386e1a KK	53
5d386e1a KK	54	return 0;
49ed2b49 KK	55	}
49ed2b49 KK	56
dbd79aed	57	u8 pciehp_handle_attention_button(struct slot *p_slot)
1da177e4	58	{
5d386e1a	59	u32 event_type;
7f2feec1	60	struct controller *ctrl = p_slot->ctrl;
1da177e4 LT	61
1da177e4 LT	62	/* Attention Button Change */
18b341b7	63	ctrl_dbg(ctrl, "Attention button interrupt received\n");
1da177e4	64
1da177e4 LT	65	/*
	66	* Button pressed - See if need to TAKE ACTION!!!
	67	*/
e1acb24f	68	ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
5d386e1a	69	event_type = INT_BUTTON_PRESS;
1da177e4	70
5d386e1a	71	queue_interrupt_event(p_slot, event_type);
1da177e4 LT	72
1da177e4 LT	73	return 0;
1da177e4 LT	74	}
1da177e4 LT	75
dbd79aed	76	u8 pciehp_handle_switch_change(struct slot *p_slot)
1da177e4	77	{
1da177e4	78	u8 getstatus;
5d386e1a	79	u32 event_type;
7f2feec1	80	struct controller *ctrl = p_slot->ctrl;
1da177e4 LT	81
1da177e4 LT	82	/* Switch Change */
18b341b7	83	ctrl_dbg(ctrl, "Switch interrupt received\n");
1da177e4	84
82a9e79e	85	pciehp_get_latch_status(p_slot, &getstatus);
1da177e4 LT	86	if (getstatus) {
	87	/*
	88	* Switch opened
	89	*/
e1acb24f	90	ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
5d386e1a	91	event_type = INT_SWITCH_OPEN;
1da177e4 LT	92	} else {
	93	/*
	94	* Switch closed
	95	*/
e1acb24f	96	ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
5d386e1a	97	event_type = INT_SWITCH_CLOSE;
1da177e4 LT	98	}
1da177e4 LT	99
5d386e1a	100	queue_interrupt_event(p_slot, event_type);
1da177e4	101
5d386e1a	102	return 1;
1da177e4 LT	103	}
1da177e4 LT	104
dbd79aed	105	u8 pciehp_handle_presence_change(struct slot *p_slot)
1da177e4	106	{
5d386e1a KK	107	u32 event_type;
5d386e1a KK	108	u8 presence_save;
7f2feec1	109	struct controller *ctrl = p_slot->ctrl;
1da177e4 LT	110
1da177e4 LT	111	/* Presence Change */
18b341b7	112	ctrl_dbg(ctrl, "Presence/Notify input change\n");
1da177e4	113
1da177e4 LT	114	/* Switch is open, assume a presence change
	115	* Save the presence state
	116	*/
82a9e79e	117	pciehp_get_adapter_status(p_slot, &presence_save);
ed6cbcf2	118	if (presence_save) {
1da177e4 LT	119	/*
	120	* Card Present
	121	*/
e1acb24f	122	ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot));
5d386e1a	123	event_type = INT_PRESENCE_ON;
1da177e4 LT	124	} else {
	125	/*
	126	* Not Present
	127	*/
e1acb24f AC	128	ctrl_info(ctrl, "Card not present on Slot(%s)\n",
e1acb24f AC	129	slot_name(p_slot));
5d386e1a	130	event_type = INT_PRESENCE_OFF;
1da177e4 LT	131	}
1da177e4 LT	132
5d386e1a	133	queue_interrupt_event(p_slot, event_type);
1da177e4	134
5d386e1a	135	return 1;
1da177e4 LT	136	}
1da177e4 LT	137
dbd79aed	138	u8 pciehp_handle_power_fault(struct slot *p_slot)
1da177e4	139	{
5d386e1a	140	u32 event_type;
7f2feec1	141	struct controller *ctrl = p_slot->ctrl;
1da177e4 LT	142
1da177e4 LT	143	/* power fault */
18b341b7	144	ctrl_dbg(ctrl, "Power fault interrupt received\n");
5651c48c KK	145	ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
	146	event_type = INT_POWER_FAULT;
	147	ctrl_info(ctrl, "Power fault bit %x set\n", 0);
5d386e1a KK	148	queue_interrupt_event(p_slot, event_type);
	149
	150	return 1;
1da177e4 LT	151	}
1da177e4 LT	152
36ed27b0	153	/* The following routines constitute the bulk of the
1da177e4 LT	154	hotplug controller logic
	155	*/
	156
	157	static void set_slot_off(struct controller ctrl, struct slot pslot)
	158	{
1da177e4	159	/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
ae416e6b	160	if (POWER_CTRL(ctrl)) {
82a9e79e	161	if (pciehp_power_off_slot(pslot)) {
7f2feec1	162	ctrl_err(ctrl,
18b341b7	163	"Issue of Slot Power Off command failed\n");
1da177e4 LT	164	return;
1da177e4 LT	165	}
c7b4fee3 KK	166	/*
	167	* After turning power off, we must wait for at least 1 second
	168	* before taking any action that relies on power having been
	169	* removed from the slot/adapter.
	170	*/
	171	msleep(1000);
1da177e4 LT	172	}
1da177e4 LT	173
ae416e6b	174	if (PWR_LED(ctrl))
82a9e79e	175	pciehp_green_led_off(pslot);
1da177e4	176
ae416e6b	177	if (ATTN_LED(ctrl)) {
82a9e79e	178	if (pciehp_set_attention_status(pslot, 1)) {
18b341b7 TI	179	ctrl_err(ctrl,
18b341b7 TI	180	"Issue of Set Attention Led command failed\n");
1da177e4 LT	181	return;
1da177e4 LT	182	}
1da177e4	183	}
1da177e4 LT	184	}
	185
	186	/**
	187	* board_added - Called after a board has been added to the system.
26e6c66e	188	* @p_slot: &slot where board is added
1da177e4	189	*
26e6c66e RD	190	* Turns power on for the board.
26e6c66e RD	191	* Configures board.
1da177e4	192	*/
ed6cbcf2	193	static int board_added(struct slot *p_slot)
1da177e4	194	{
44ef4cef	195	int retval = 0;
ca22a5e4	196	struct controller *ctrl = p_slot->ctrl;
385e2491	197	struct pci_bus *parent = ctrl->pcie->port->subordinate;
1da177e4	198
ae416e6b	199	if (POWER_CTRL(ctrl)) {
1da177e4	200	/* Power on slot */
82a9e79e	201	retval = pciehp_power_on_slot(p_slot);
44ef4cef KK	202	if (retval)
44ef4cef KK	203	return retval;
1da177e4	204	}
36ed27b0	205
ae416e6b	206	if (PWR_LED(ctrl))
82a9e79e	207	pciehp_green_led_blink(p_slot);
1da177e4	208
44ef4cef	209	/* Check link training status */
82a9e79e	210	retval = pciehp_check_link_status(ctrl);
44ef4cef	211	if (retval) {
18b341b7	212	ctrl_err(ctrl, "Failed to check link status\n");
5651c48c	213	goto err_exit;
1da177e4 LT	214	}
1da177e4 LT	215
1da177e4	216	/* Check for a power fault */
5651c48c KK	217	if (ctrl->power_fault_detected \|\| pciehp_query_power_fault(p_slot)) {
5651c48c KK	218	ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
d9fb42a8	219	retval = -EIO;
71b720c0	220	goto err_exit;
1da177e4 LT	221	}
1da177e4 LT	222
44ef4cef KK	223	retval = pciehp_configure_device(p_slot);
44ef4cef KK	224	if (retval) {
d689f7eb KK	225	ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
d689f7eb KK	226	pci_domain_nr(parent), parent->number);
71b720c0	227	goto err_exit;
71b720c0	228	}
1da177e4	229
ae416e6b	230	if (PWR_LED(ctrl))
82a9e79e	231	pciehp_green_led_on(p_slot);
44ef4cef	232
1da177e4	233	return 0;
71b720c0	234
	235	err_exit:
	236	set_slot_off(ctrl, p_slot);
44ef4cef	237	return retval;
1da177e4 LT	238	}
1da177e4 LT	239
1da177e4	240	/**
26e6c66e RD	241	* remove_board - Turns off slot and LEDs
26e6c66e RD	242	* @p_slot: slot where board is being removed
1da177e4	243	*/
ed6cbcf2	244	static int remove_board(struct slot *p_slot)
1da177e4	245	{
44ef4cef	246	int retval = 0;
ca22a5e4	247	struct controller *ctrl = p_slot->ctrl;
1da177e4	248
44ef4cef KK	249	retval = pciehp_unconfigure_device(p_slot);
	250	if (retval)
	251	return retval;
1da177e4	252
ae416e6b	253	if (POWER_CTRL(ctrl)) {
1da177e4	254	/* power off slot */
82a9e79e	255	retval = pciehp_power_off_slot(p_slot);
44ef4cef	256	if (retval) {
18b341b7 TI	257	ctrl_err(ctrl,
18b341b7 TI	258	"Issue of Slot Disable command failed\n");
44ef4cef	259	return retval;
1da177e4	260	}
c7b4fee3 KK	261	/*
	262	* After turning power off, we must wait for at least 1 second
	263	* before taking any action that relies on power having been
	264	* removed from the slot/adapter.
	265	*/
	266	msleep(1000);
1da177e4 LT	267	}
1da177e4 LT	268
82a9e79e	269	/* turn off Green LED */
ae416e6b	270	if (PWR_LED(ctrl))
82a9e79e	271	pciehp_green_led_off(p_slot);
1da177e4	272
1da177e4 LT	273	return 0;
	274	}
	275
5d386e1a KK	276	struct power_work_info {
	277	struct slot *p_slot;
	278	struct work_struct work;
	279	};
1da177e4 LT	280
1da177e4 LT	281	/**
26e6c66e RD	282	* pciehp_power_thread - handle pushbutton events
26e6c66e RD	283	* @work: &struct work_struct describing work to be done
1da177e4	284	*
26e6c66e	285	* Scheduled procedure to handle blocking stuff for the pushbuttons.
1da177e4	286	* Handles all pending events and exits.
1da177e4	287	*/
5d386e1a	288	static void pciehp_power_thread(struct work_struct *work)
1da177e4	289	{
5d386e1a KK	290	struct power_work_info *info =
	291	container_of(work, struct power_work_info, work);
	292	struct slot *p_slot = info->p_slot;
	293
	294	mutex_lock(&p_slot->lock);
	295	switch (p_slot->state) {
	296	case POWEROFF_STATE:
	297	mutex_unlock(&p_slot->lock);
18b341b7	298	ctrl_dbg(p_slot->ctrl,
d689f7eb	299	"Disabling domain:bus:device=%04x:%02x:00\n",
385e2491 KK	300	pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
385e2491 KK	301	p_slot->ctrl->pcie->port->subordinate->number);
1da177e4	302	pciehp_disable_slot(p_slot);
5d386e1a	303	mutex_lock(&p_slot->lock);
1da177e4	304	p_slot->state = STATIC_STATE;
5d386e1a KK	305	break;
	306	case POWERON_STATE:
	307	mutex_unlock(&p_slot->lock);
82a9e79e KK	308	if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl))
82a9e79e KK	309	pciehp_green_led_off(p_slot);
5d386e1a	310	mutex_lock(&p_slot->lock);
1da177e4	311	p_slot->state = STATIC_STATE;
5d386e1a KK	312	break;
	313	default:
	314	break;
1da177e4	315	}
5d386e1a	316	mutex_unlock(&p_slot->lock);
1da177e4	317
5d386e1a	318	kfree(info);
1da177e4 LT	319	}
1da177e4 LT	320
e325e1f0	321	void pciehp_queue_pushbutton_work(struct work_struct *work)
1da177e4	322	{
5d386e1a KK	323	struct slot *p_slot = container_of(work, struct slot, work.work);
5d386e1a KK	324	struct power_work_info *info;
1da177e4	325
5d386e1a KK	326	info = kmalloc(sizeof(*info), GFP_KERNEL);
5d386e1a KK	327	if (!info) {
7f2feec1 TI	328	ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
7f2feec1 TI	329	__func__);
1da177e4 LT	330	return;
1da177e4 LT	331	}
5d386e1a KK	332	info->p_slot = p_slot;
5d386e1a KK	333	INIT_WORK(&info->work, pciehp_power_thread);
1da177e4	334
5d386e1a KK	335	mutex_lock(&p_slot->lock);
	336	switch (p_slot->state) {
	337	case BLINKINGOFF_STATE:
1da177e4	338	p_slot->state = POWEROFF_STATE;
5d386e1a KK	339	break;
5d386e1a KK	340	case BLINKINGON_STATE:
1da177e4	341	p_slot->state = POWERON_STATE;
5d386e1a KK	342	break;
5d386e1a KK	343	default:
6fcaf17a	344	kfree(info);
5d386e1a	345	goto out;
1da177e4	346	}
a827ea30	347	queue_work(pciehp_ordered_wq, &info->work);
5d386e1a KK	348	out:
5d386e1a KK	349	mutex_unlock(&p_slot->lock);
1da177e4 LT	350	}
1da177e4 LT	351
5d386e1a KK	352	/*
	353	* Note: This function must be called with slot->lock held
	354	*/
	355	static void handle_button_press_event(struct slot *p_slot)
1da177e4	356	{
5d386e1a	357	struct controller *ctrl = p_slot->ctrl;
1da177e4	358	u8 getstatus;
1da177e4	359
5d386e1a KK	360	switch (p_slot->state) {
5d386e1a KK	361	case STATIC_STATE:
82a9e79e	362	pciehp_get_power_status(p_slot, &getstatus);
5d386e1a KK	363	if (getstatus) {
5d386e1a KK	364	p_slot->state = BLINKINGOFF_STATE;
7f2feec1 TI	365	ctrl_info(ctrl,
7f2feec1 TI	366	"PCI slot #%s - powering off due to button "
e1acb24f	367	"press.\n", slot_name(p_slot));
5d386e1a KK	368	} else {
5d386e1a KK	369	p_slot->state = BLINKINGON_STATE;
7f2feec1 TI	370	ctrl_info(ctrl,
7f2feec1 TI	371	"PCI slot #%s - powering on due to button "
e1acb24f	372	"press.\n", slot_name(p_slot));
5d386e1a KK	373	}
5d386e1a KK	374	/* blink green LED and turn off amber */
ae416e6b	375	if (PWR_LED(ctrl))
82a9e79e	376	pciehp_green_led_blink(p_slot);
ae416e6b	377	if (ATTN_LED(ctrl))
82a9e79e	378	pciehp_set_attention_status(p_slot, 0);
5d386e1a	379
a827ea30	380	queue_delayed_work(pciehp_wq, &p_slot->work, 5*HZ);
5d386e1a KK	381	break;
	382	case BLINKINGOFF_STATE:
	383	case BLINKINGON_STATE:
	384	/*
	385	* Cancel if we are still blinking; this means that we
	386	* press the attention again before the 5 sec. limit
	387	* expires to cancel hot-add or hot-remove
	388	*/
e1acb24f	389	ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
5d386e1a KK	390	cancel_delayed_work(&p_slot->work);
5d386e1a KK	391	if (p_slot->state == BLINKINGOFF_STATE) {
ae416e6b	392	if (PWR_LED(ctrl))
82a9e79e	393	pciehp_green_led_on(p_slot);
5d386e1a	394	} else {
ae416e6b	395	if (PWR_LED(ctrl))
82a9e79e	396	pciehp_green_led_off(p_slot);
5d386e1a	397	}
ae416e6b	398	if (ATTN_LED(ctrl))
82a9e79e	399	pciehp_set_attention_status(p_slot, 0);
7f2feec1	400	ctrl_info(ctrl, "PCI slot #%s - action canceled "
e1acb24f	401	"due to button press\n", slot_name(p_slot));
5d386e1a KK	402	p_slot->state = STATIC_STATE;
	403	break;
	404	case POWEROFF_STATE:
	405	case POWERON_STATE:
	406	/*
	407	* Ignore if the slot is on power-on or power-off state;
	408	* this means that the previous attention button action
	409	* to hot-add or hot-remove is undergoing
	410	*/
e1acb24f	411	ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
5d386e1a KK	412	break;
5d386e1a KK	413	default:
7f2feec1	414	ctrl_warn(ctrl, "Not a valid state\n");
5d386e1a	415	break;
1da177e4 LT	416	}
	417	}
	418
5d386e1a KK	419	/*
	420	* Note: This function must be called with slot->lock held
	421	*/
	422	static void handle_surprise_event(struct slot *p_slot)
	423	{
	424	u8 getstatus;
	425	struct power_work_info *info;
	426
	427	info = kmalloc(sizeof(*info), GFP_KERNEL);
	428	if (!info) {
7f2feec1 TI	429	ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
7f2feec1 TI	430	__func__);
5d386e1a KK	431	return;
	432	}
	433	info->p_slot = p_slot;
	434	INIT_WORK(&info->work, pciehp_power_thread);
	435
82a9e79e	436	pciehp_get_adapter_status(p_slot, &getstatus);
5d386e1a KK	437	if (!getstatus)
	438	p_slot->state = POWEROFF_STATE;
	439	else
	440	p_slot->state = POWERON_STATE;
	441
a827ea30	442	queue_work(pciehp_ordered_wq, &info->work);
5d386e1a KK	443	}
	444
	445	static void interrupt_event_handler(struct work_struct *work)
	446	{
	447	struct event_info *info = container_of(work, struct event_info, work);
	448	struct slot *p_slot = info->p_slot;
	449	struct controller *ctrl = p_slot->ctrl;
	450
	451	mutex_lock(&p_slot->lock);
	452	switch (info->event_type) {
	453	case INT_BUTTON_PRESS:
	454	handle_button_press_event(p_slot);
	455	break;
	456	case INT_POWER_FAULT:
ae416e6b	457	if (!POWER_CTRL(ctrl))
5d386e1a	458	break;
ae416e6b	459	if (ATTN_LED(ctrl))
82a9e79e	460	pciehp_set_attention_status(p_slot, 1);
ae416e6b	461	if (PWR_LED(ctrl))
82a9e79e	462	pciehp_green_led_off(p_slot);
5d386e1a KK	463	break;
	464	case INT_PRESENCE_ON:
	465	case INT_PRESENCE_OFF:
ae416e6b	466	if (!HP_SUPR_RM(ctrl))
5d386e1a	467	break;
7f2feec1	468	ctrl_dbg(ctrl, "Surprise Removal\n");
5d386e1a KK	469	handle_surprise_event(p_slot);
	470	break;
	471	default:
5d386e1a KK	472	break;
	473	}
	474	mutex_unlock(&p_slot->lock);
	475
	476	kfree(info);
	477	}
	478
1da177e4 LT	479	int pciehp_enable_slot(struct slot *p_slot)
	480	{
	481	u8 getstatus = 0;
	482	int rc;
7f2feec1	483	struct controller *ctrl = p_slot->ctrl;
1da177e4	484
82a9e79e	485	rc = pciehp_get_adapter_status(p_slot, &getstatus);
1da177e4	486	if (rc \|\| !getstatus) {
18b341b7	487	ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
c9d86d76	488	return -ENODEV;
1da177e4	489	}
ae416e6b	490	if (MRL_SENS(p_slot->ctrl)) {
82a9e79e	491	rc = pciehp_get_latch_status(p_slot, &getstatus);
1da177e4	492	if (rc \|\| getstatus) {
18b341b7 TI	493	ctrl_info(ctrl, "Latch open on slot(%s)\n",
18b341b7 TI	494	slot_name(p_slot));
c9d86d76	495	return -ENODEV;
1da177e4 LT	496	}
1da177e4 LT	497	}
36ed27b0	498
ae416e6b	499	if (POWER_CTRL(p_slot->ctrl)) {
82a9e79e	500	rc = pciehp_get_power_status(p_slot, &getstatus);
1da177e4	501	if (rc \|\| getstatus) {
18b341b7 TI	502	ctrl_info(ctrl, "Already enabled on slot(%s)\n",
18b341b7 TI	503	slot_name(p_slot));
c9d86d76	504	return -EINVAL;
1da177e4 LT	505	}
1da177e4 LT	506	}
1da177e4	507
82a9e79e	508	pciehp_get_latch_status(p_slot, &getstatus);
1da177e4	509
ca22a5e4	510	rc = board_added(p_slot);
1da177e4	511	if (rc) {
82a9e79e	512	pciehp_get_latch_status(p_slot, &getstatus);
1da177e4	513	}
1da177e4 LT	514	return rc;
	515	}
	516
	517
	518	int pciehp_disable_slot(struct slot *p_slot)
	519	{
1da177e4	520	u8 getstatus = 0;
1da177e4	521	int ret = 0;
7f2feec1	522	struct controller *ctrl = p_slot->ctrl;
1da177e4 LT	523
	524	if (!p_slot->ctrl)
	525	return 1;
	526
ae416e6b	527	if (!HP_SUPR_RM(p_slot->ctrl)) {
82a9e79e	528	ret = pciehp_get_adapter_status(p_slot, &getstatus);
1da177e4	529	if (ret \|\| !getstatus) {
18b341b7 TI	530	ctrl_info(ctrl, "No adapter on slot(%s)\n",
18b341b7 TI	531	slot_name(p_slot));
c9d86d76	532	return -ENODEV;
1da177e4 LT	533	}
	534	}
	535
ae416e6b	536	if (MRL_SENS(p_slot->ctrl)) {
82a9e79e	537	ret = pciehp_get_latch_status(p_slot, &getstatus);
1da177e4	538	if (ret \|\| getstatus) {
18b341b7 TI	539	ctrl_info(ctrl, "Latch open on slot(%s)\n",
18b341b7 TI	540	slot_name(p_slot));
c9d86d76	541	return -ENODEV;
1da177e4 LT	542	}
	543	}
	544
ae416e6b	545	if (POWER_CTRL(p_slot->ctrl)) {
82a9e79e	546	ret = pciehp_get_power_status(p_slot, &getstatus);
1da177e4	547	if (ret \|\| !getstatus) {
18b341b7 TI	548	ctrl_info(ctrl, "Already disabled on slot(%s)\n",
18b341b7 TI	549	slot_name(p_slot));
c9d86d76	550	return -EINVAL;
1da177e4 LT	551	}
	552	}
	553
445f7985	554	return remove_board(p_slot);
1da177e4 LT	555	}
1da177e4 LT	556
5d386e1a KK	557	int pciehp_sysfs_enable_slot(struct slot *p_slot)
	558	{
	559	int retval = -ENODEV;
7f2feec1	560	struct controller *ctrl = p_slot->ctrl;
5d386e1a KK	561
	562	mutex_lock(&p_slot->lock);
	563	switch (p_slot->state) {
	564	case BLINKINGON_STATE:
	565	cancel_delayed_work(&p_slot->work);
	566	case STATIC_STATE:
	567	p_slot->state = POWERON_STATE;
	568	mutex_unlock(&p_slot->lock);
	569	retval = pciehp_enable_slot(p_slot);
	570	mutex_lock(&p_slot->lock);
	571	p_slot->state = STATIC_STATE;
	572	break;
	573	case POWERON_STATE:
7f2feec1	574	ctrl_info(ctrl, "Slot %s is already in powering on state\n",
e1acb24f	575	slot_name(p_slot));
5d386e1a KK	576	break;
	577	case BLINKINGOFF_STATE:
	578	case POWEROFF_STATE:
e1acb24f AC	579	ctrl_info(ctrl, "Already enabled on slot %s\n",
e1acb24f AC	580	slot_name(p_slot));
5d386e1a KK	581	break;
5d386e1a KK	582	default:
e1acb24f AC	583	ctrl_err(ctrl, "Not a valid state on slot %s\n",
e1acb24f AC	584	slot_name(p_slot));
5d386e1a KK	585	break;
	586	}
	587	mutex_unlock(&p_slot->lock);
	588
	589	return retval;
	590	}
	591
	592	int pciehp_sysfs_disable_slot(struct slot *p_slot)
	593	{
	594	int retval = -ENODEV;
7f2feec1	595	struct controller *ctrl = p_slot->ctrl;
5d386e1a KK	596
	597	mutex_lock(&p_slot->lock);
	598	switch (p_slot->state) {
	599	case BLINKINGOFF_STATE:
	600	cancel_delayed_work(&p_slot->work);
	601	case STATIC_STATE:
	602	p_slot->state = POWEROFF_STATE;
	603	mutex_unlock(&p_slot->lock);
	604	retval = pciehp_disable_slot(p_slot);
	605	mutex_lock(&p_slot->lock);
	606	p_slot->state = STATIC_STATE;
	607	break;
	608	case POWEROFF_STATE:
7f2feec1	609	ctrl_info(ctrl, "Slot %s is already in powering off state\n",
e1acb24f	610	slot_name(p_slot));
5d386e1a KK	611	break;
	612	case BLINKINGON_STATE:
	613	case POWERON_STATE:
e1acb24f AC	614	ctrl_info(ctrl, "Already disabled on slot %s\n",
e1acb24f AC	615	slot_name(p_slot));
5d386e1a KK	616	break;
5d386e1a KK	617	default:
e1acb24f AC	618	ctrl_err(ctrl, "Not a valid state on slot %s\n",
e1acb24f AC	619	slot_name(p_slot));
5d386e1a KK	620	break;
	621	}
	622	mutex_unlock(&p_slot->lock);
	623
	624	return retval;
	625	}