drivers/pci/hotplug/rpaphp_core.c - maze/linux - Git at Google

 /*
  * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
  * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
  *
  * 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 <lxie@us.ibm.com>
  *
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/pci.h>
 #include <linux/pci_hotplug.h>
 #include <linux/slab.h>
 #include <linux/smp.h>
 #include <linux/init.h>
 #include <asm/eeh.h>       /* for eeh_add_device() */
 #include <asm/rtas.h>		/* rtas_call */
 #include <asm/pci-bridge.h>	/* for pci_controller */
 #include "../pci.h"		/* for pci_add_new_bus */
 				/* and pci_do_scan_bus */
 #include "rpaphp.h"

 int rpaphp_debug;
 LIST_HEAD(rpaphp_slot_head);

 #define DRIVER_VERSION	"0.1"
 #define DRIVER_AUTHOR	"Linda Xie <lxie@us.ibm.com>"
 #define DRIVER_DESC	"RPA HOT Plug PCI Controller Driver"

 #define MAX_LOC_CODE 128

 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");

 module_param_named(debug, rpaphp_debug, bool, 0644);

 /**
  * set_attention_status - set attention LED
  * @hotplug_slot: target &hotplug_slot
  * @value: LED control value
  *
  * echo 0 > attention -- set LED OFF
  * echo 1 > attention -- set LED ON
  * echo 2 > attention -- set LED ID(identify, light is blinking)
  */
 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
 {
 	int rc;
 	struct slot *slot = (struct slot *)hotplug_slot->private;

 	switch (value) {
 	case 0:
 	case 1:
 	case 2:
 		break;
 	default:
 		value = 1;
 		break;
 	}

 	rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
 	if (!rc)
 		hotplug_slot->info->attention_status = value;

 	return rc;
 }

 /**
  * get_power_status - get power status of a slot
  * @hotplug_slot: slot to get status
  * @value: pointer to store status
  */
 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
 {
 	int retval, level;
 	struct slot *slot = (struct slot *)hotplug_slot->private;

 	retval = rtas_get_power_level (slot->power_domain, &level);
 	if (!retval)
 		*value = level;
 	return retval;
 }

 /**
  * get_attention_status - get attention LED status
  * @hotplug_slot: slot to get status
  * @value: pointer to store status
  */
 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
 {
 	struct slot *slot = (struct slot *)hotplug_slot->private;
 	*value = slot->hotplug_slot->info->attention_status;
 	return 0;
 }

 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
 {
 	struct slot *slot = (struct slot *)hotplug_slot->private;
 	int rc, state;

 	rc = rpaphp_get_sensor_state(slot, &state);

 	*value = NOT_VALID;
 	if (rc)
 		return rc;

 	if (state == EMPTY)
 		*value = EMPTY;
 	else if (state == PRESENT)
 		*value = slot->state;

 	return 0;
 }

 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 {
 	struct slot *slot = (struct slot *)hotplug_slot->private;

 	switch (slot->type) {
 	case 1:
 	case 2:
 	case 3:
 	case 4:
 	case 5:
 	case 6:
 		*value = PCI_SPEED_33MHz;	/* speed for case 1-6 */
 		break;
 	case 7:
 	case 8:
 		*value = PCI_SPEED_66MHz;
 		break;
 	case 11:
 	case 14:
 		*value = PCI_SPEED_66MHz_PCIX;
 		break;
 	case 12:
 	case 15:
 		*value = PCI_SPEED_100MHz_PCIX;
 		break;
 	case 13:
 	case 16:
 		*value = PCI_SPEED_133MHz_PCIX;
 		break;
 	default:
 		*value = PCI_SPEED_UNKNOWN;
 		break;

 	}
 	return 0;
 }

 static int get_children_props(struct device_node *dn, const int **drc_indexes,
 		const int **drc_names, const int **drc_types,
 		const int **drc_power_domains)
 {
 	const int *indexes, *names, *types, *domains;

 	indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
 	names = of_get_property(dn, "ibm,drc-names", NULL);
 	types = of_get_property(dn, "ibm,drc-types", NULL);
 	domains = of_get_property(dn, "ibm,drc-power-domains", NULL);

 	if (!indexes || !names || !types || !domains) {
 		/* Slot does not have dynamically-removable children */
 		return -EINVAL;
 	}
 	if (drc_indexes)
 		*drc_indexes = indexes;
 	if (drc_names)
 		/* &drc_names[1] contains NULL terminated slot names */
 		*drc_names = names;
 	if (drc_types)
 		/* &drc_types[1] contains NULL terminated slot types */
 		*drc_types = types;
 	if (drc_power_domains)
 		*drc_power_domains = domains;

 	return 0;
 }

 /* To get the DRC props describing the current node, first obtain it's
  * my-drc-index property.  Next obtain the DRC list from it's parent.  Use
  * the my-drc-index for correlation, and obtain the requested properties.
  */
 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
 		char **drc_name, char **drc_type, int *drc_power_domain)
 {
 	const int *indexes, *names;
 	const int *types, *domains;
 	const unsigned int *my_index;
 	char *name_tmp, *type_tmp;
 	int i, rc;

 	my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
 	if (!my_index) {
 		/* Node isn't DLPAR/hotplug capable */
 		return -EINVAL;
 	}

 	rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
 	if (rc < 0) {
 		return -EINVAL;
 	}

 	name_tmp = (char *) &names[1];
 	type_tmp = (char *) &types[1];

 	/* Iterate through parent properties, looking for my-drc-index */
 	for (i = 0; i < indexes[0]; i++) {
 		if ((unsigned int) indexes[i + 1] == *my_index) {
 			if (drc_name)
                 		*drc_name = name_tmp;
 			if (drc_type)
 				*drc_type = type_tmp;
 			if (drc_index)
 				*drc_index = *my_index;
 			if (drc_power_domain)
 				*drc_power_domain = domains[i+1];
 			return 0;
 		}
 		name_tmp += (strlen(name_tmp) + 1);
 		type_tmp += (strlen(type_tmp) + 1);
 	}

 	return -EINVAL;
 }

 static int is_php_type(char *drc_type)
 {
 	unsigned long value;
 	char *endptr;

 	/* PCI Hotplug nodes have an integer for drc_type */
 	value = simple_strtoul(drc_type, &endptr, 10);
 	if (endptr == drc_type)
 		return 0;

 	return 1;
 }

 /**
  * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
  * @dn: target &device_node
  * @indexes: passed to get_children_props()
  * @names: passed to get_children_props()
  * @types: returned from get_children_props()
  * @power_domains:
  *
  * This routine will return true only if the device node is
  * a hotpluggable slot. This routine will return false
  * for built-in pci slots (even when the built-in slots are
  * dlparable.)
  */
 static int is_php_dn(struct device_node *dn, const int **indexes,
 		const int **names, const int **types, const int **power_domains)
 {
 	const int *drc_types;
 	int rc;

 	rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
 	if (rc < 0)
 		return 0;

 	if (!is_php_type((char *) &drc_types[1]))
 		return 0;

 	*types = drc_types;
 	return 1;
 }

 /**
  * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
  * @dn: device node of slot
  *
  * This subroutine will register a hotplugable slot with the
  * PCI hotplug infrastructure. This routine is typicaly called
  * during boot time, if the hotplug slots are present at boot time,
  * or is called later, by the dlpar add code, if the slot is
  * being dynamically added during runtime.
  *
  * If the device node points at an embedded (built-in) slot, this
  * routine will just return without doing anything, since embedded
  * slots cannot be hotplugged.
  *
  * To remove a slot, it suffices to call rpaphp_deregister_slot().
  */
 int rpaphp_add_slot(struct device_node *dn)
 {
 	struct slot *slot;
 	int retval = 0;
 	int i;
 	const int *indexes, *names, *types, *power_domains;
 	char *name, *type;

 	if (!dn->name || strcmp(dn->name, "pci"))
 		return 0;

 	/* If this is not a hotplug slot, return without doing anything. */
 	if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
 		return 0;

 	dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);

 	/* register PCI devices */
 	name = (char *) &names[1];
 	type = (char *) &types[1];
 	for (i = 0; i < indexes[0]; i++) {

 		slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
 		if (!slot)
 			return -ENOMEM;

 		slot->type = simple_strtoul(type, NULL, 10);

 		dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
 				indexes[i + 1], name, type);

 		retval = rpaphp_enable_slot(slot);
 		if (!retval)
 			retval = rpaphp_register_slot(slot);

 		if (retval)
 			dealloc_slot_struct(slot);

 		name += strlen(name) + 1;
 		type += strlen(type) + 1;
 	}
 	dbg("%s - Exit: rc[%d]\n", __func__, retval);

 	/* XXX FIXME: reports a failure only if last entry in loop failed */
 	return retval;
 }

 static void __exit cleanup_slots(void)
 {
 	struct list_head *tmp, *n;
 	struct slot *slot;

 	/*
 	 * Unregister all of our slots with the pci_hotplug subsystem,
 	 * and free up all memory that we had allocated.
 	 * memory will be freed in release_slot callback.
 	 */

 	list_for_each_safe(tmp, n, &rpaphp_slot_head) {
 		slot = list_entry(tmp, struct slot, rpaphp_slot_list);
 		list_del(&slot->rpaphp_slot_list);
 		pci_hp_deregister(slot->hotplug_slot);
 	}
 	return;
 }

 static int __init rpaphp_init(void)
 {
 	struct device_node *dn = NULL;

 	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");

 	while ((dn = of_find_node_by_name(dn, "pci")))
 		rpaphp_add_slot(dn);

 	return 0;
 }

 static void __exit rpaphp_exit(void)
 {
 	cleanup_slots();
 }

 static int enable_slot(struct hotplug_slot *hotplug_slot)
 {
 	struct slot *slot = (struct slot *)hotplug_slot->private;
 	int state;
 	int retval;

 	if (slot->state == CONFIGURED)
 		return 0;

 	retval = rpaphp_get_sensor_state(slot, &state);
 	if (retval)
 		return retval;

 	if (state == PRESENT) {
 		pcibios_add_pci_devices(slot->bus);
 		slot->state = CONFIGURED;
 	} else if (state == EMPTY) {
 		slot->state = EMPTY;
 	} else {
 		err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
 		slot->state = NOT_VALID;
 		return -EINVAL;
 	}
 	return 0;
 }

 static int disable_slot(struct hotplug_slot *hotplug_slot)
 {
 	struct slot *slot = (struct slot *)hotplug_slot->private;
 	if (slot->state == NOT_CONFIGURED)
 		return -EINVAL;

 	pcibios_remove_pci_devices(slot->bus);
 	slot->state = NOT_CONFIGURED;
 	return 0;
 }

 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
 	.enable_slot = enable_slot,
 	.disable_slot = disable_slot,
 	.set_attention_status = set_attention_status,
 	.get_power_status = get_power_status,
 	.get_attention_status = get_attention_status,
 	.get_adapter_status = get_adapter_status,
 	.get_max_bus_speed = get_max_bus_speed,
 };

 module_init(rpaphp_init);
 module_exit(rpaphp_exit);

 EXPORT_SYMBOL_GPL(rpaphp_add_slot);
 EXPORT_SYMBOL_GPL(rpaphp_slot_head);
 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
	/*
	* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
	* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
	*
	* 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 <lxie@us.ibm.com>
	*
	*/
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/pci.h>
	#include <linux/pci_hotplug.h>
	#include <linux/slab.h>
	#include <linux/smp.h>
	#include <linux/init.h>
	#include <asm/eeh.h> /* for eeh_add_device() */
	#include <asm/rtas.h> /* rtas_call */
	#include <asm/pci-bridge.h> /* for pci_controller */
	#include "../pci.h" /* for pci_add_new_bus */
	/* and pci_do_scan_bus */
	#include "rpaphp.h"

	int rpaphp_debug;
	LIST_HEAD(rpaphp_slot_head);

	#define DRIVER_VERSION "0.1"
	#define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
	#define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"

	#define MAX_LOC_CODE 128

	MODULE_AUTHOR(DRIVER_AUTHOR);
	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_LICENSE("GPL");

	module_param_named(debug, rpaphp_debug, bool, 0644);

	/**
	* set_attention_status - set attention LED
	* @hotplug_slot: target &hotplug_slot
	* @value: LED control value
	*
	* echo 0 > attention -- set LED OFF
	* echo 1 > attention -- set LED ON
	* echo 2 > attention -- set LED ID(identify, light is blinking)
	*/
	static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
	{
	int rc;
	struct slot slot = (struct slot )hotplug_slot->private;

	switch (value) {
	case 0:
	case 1:
	case 2:
	break;
	default:
	value = 1;
	break;
	}

	rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
	if (!rc)
	hotplug_slot->info->attention_status = value;

	return rc;
	}

	/**
	* get_power_status - get power status of a slot
	* @hotplug_slot: slot to get status
	* @value: pointer to store status
	*/
	static int get_power_status(struct hotplug_slot hotplug_slot, u8 value)
	{
	int retval, level;
	struct slot slot = (struct slot )hotplug_slot->private;

	retval = rtas_get_power_level (slot->power_domain, &level);
	if (!retval)
	*value = level;
	return retval;
	}

	/**
	* get_attention_status - get attention LED status
	* @hotplug_slot: slot to get status
	* @value: pointer to store status
	*/
	static int get_attention_status(struct hotplug_slot hotplug_slot, u8 value)
	{
	struct slot slot = (struct slot )hotplug_slot->private;
	*value = slot->hotplug_slot->info->attention_status;
	return 0;
	}

	static int get_adapter_status(struct hotplug_slot hotplug_slot, u8 value)
	{
	struct slot slot = (struct slot )hotplug_slot->private;
	int rc, state;

	rc = rpaphp_get_sensor_state(slot, &state);

	*value = NOT_VALID;
	if (rc)
	return rc;

	if (state == EMPTY)
	*value = EMPTY;
	else if (state == PRESENT)
	*value = slot->state;

	return 0;
	}

	static int get_max_bus_speed(struct hotplug_slot hotplug_slot, enum pci_bus_speed value)
	{
	struct slot slot = (struct slot )hotplug_slot->private;

	switch (slot->type) {
	case 1:
	case 2:
	case 3:
	case 4:
	case 5:
	case 6:
	value = PCI_SPEED_33MHz; / speed for case 1-6 */
	break;
	case 7:
	case 8:
	*value = PCI_SPEED_66MHz;
	break;
	case 11:
	case 14:
	*value = PCI_SPEED_66MHz_PCIX;
	break;
	case 12:
	case 15:
	*value = PCI_SPEED_100MHz_PCIX;
	break;
	case 13:
	case 16:
	*value = PCI_SPEED_133MHz_PCIX;
	break;
	default:
	*value = PCI_SPEED_UNKNOWN;
	break;

	}
	return 0;
	}

	static int get_children_props(struct device_node dn, const int *drc_indexes,
	const int drc_names, const int drc_types,
	const int **drc_power_domains)
	{
	const int indexes, names, types, domains;

	indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
	names = of_get_property(dn, "ibm,drc-names", NULL);
	types = of_get_property(dn, "ibm,drc-types", NULL);
	domains = of_get_property(dn, "ibm,drc-power-domains", NULL);

	if (!indexes \|\| !names \|\| !types \|\| !domains) {
	/* Slot does not have dynamically-removable children */
	return -EINVAL;
	}
	if (drc_indexes)
	*drc_indexes = indexes;
	if (drc_names)
	/* &drc_names[1] contains NULL terminated slot names */
	*drc_names = names;
	if (drc_types)
	/* &drc_types[1] contains NULL terminated slot types */
	*drc_types = types;
	if (drc_power_domains)
	*drc_power_domains = domains;

	return 0;
	}

	/* To get the DRC props describing the current node, first obtain it's
	* my-drc-index property. Next obtain the DRC list from it's parent. Use
	* the my-drc-index for correlation, and obtain the requested properties.
	*/
	int rpaphp_get_drc_props(struct device_node dn, int drc_index,
	char drc_name, char drc_type, int *drc_power_domain)
	{
	const int indexes, names;
	const int types, domains;
	const unsigned int *my_index;
	char name_tmp, type_tmp;
	int i, rc;

	my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
	if (!my_index) {
	/* Node isn't DLPAR/hotplug capable */
	return -EINVAL;
	}

	rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
	if (rc < 0) {
	return -EINVAL;
	}

	name_tmp = (char *) &names[1];
	type_tmp = (char *) &types[1];

	/* Iterate through parent properties, looking for my-drc-index */
	for (i = 0; i < indexes[0]; i++) {
	if ((unsigned int) indexes[i + 1] == *my_index) {
	if (drc_name)
	*drc_name = name_tmp;
	if (drc_type)
	*drc_type = type_tmp;
	if (drc_index)
	drc_index = my_index;
	if (drc_power_domain)
	*drc_power_domain = domains[i+1];
	return 0;
	}
	name_tmp += (strlen(name_tmp) + 1);
	type_tmp += (strlen(type_tmp) + 1);
	}

	return -EINVAL;
	}

	static int is_php_type(char *drc_type)
	{
	unsigned long value;
	char *endptr;

	/* PCI Hotplug nodes have an integer for drc_type */
	value = simple_strtoul(drc_type, &endptr, 10);
	if (endptr == drc_type)
	return 0;

	return 1;
	}

	/**
	* is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
	* @dn: target &device_node
	* @indexes: passed to get_children_props()
	* @names: passed to get_children_props()
	* @types: returned from get_children_props()
	* @power_domains:
	*
	* This routine will return true only if the device node is
	* a hotpluggable slot. This routine will return false
	* for built-in pci slots (even when the built-in slots are
	* dlparable.)
	*/
	static int is_php_dn(struct device_node dn, const int *indexes,
	const int names, const int types, const int **power_domains)
	{
	const int *drc_types;
	int rc;

	rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
	if (rc < 0)
	return 0;

	if (!is_php_type((char *) &drc_types[1]))
	return 0;

	*types = drc_types;
	return 1;
	}

	/**
	* rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
	* @dn: device node of slot
	*
	* This subroutine will register a hotplugable slot with the
	* PCI hotplug infrastructure. This routine is typicaly called
	* during boot time, if the hotplug slots are present at boot time,
	* or is called later, by the dlpar add code, if the slot is
	* being dynamically added during runtime.
	*
	* If the device node points at an embedded (built-in) slot, this
	* routine will just return without doing anything, since embedded
	* slots cannot be hotplugged.
	*
	* To remove a slot, it suffices to call rpaphp_deregister_slot().
	*/
	int rpaphp_add_slot(struct device_node *dn)
	{
	struct slot *slot;
	int retval = 0;
	int i;
	const int indexes, names, types, power_domains;
	char name, type;

	if (!dn->name \|\| strcmp(dn->name, "pci"))
	return 0;

	/* If this is not a hotplug slot, return without doing anything. */
	if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
	return 0;

	dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);

	/* register PCI devices */
	name = (char *) &names[1];
	type = (char *) &types[1];
	for (i = 0; i < indexes[0]; i++) {

	slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
	if (!slot)
	return -ENOMEM;

	slot->type = simple_strtoul(type, NULL, 10);

	dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
	indexes[i + 1], name, type);

	retval = rpaphp_enable_slot(slot);
	if (!retval)
	retval = rpaphp_register_slot(slot);

	if (retval)
	dealloc_slot_struct(slot);

	name += strlen(name) + 1;
	type += strlen(type) + 1;
	}
	dbg("%s - Exit: rc[%d]\n", __func__, retval);

	/* XXX FIXME: reports a failure only if last entry in loop failed */
	return retval;
	}

	static void __exit cleanup_slots(void)
	{
	struct list_head tmp, n;
	struct slot *slot;

	/*
	* Unregister all of our slots with the pci_hotplug subsystem,
	* and free up all memory that we had allocated.
	* memory will be freed in release_slot callback.
	*/

	list_for_each_safe(tmp, n, &rpaphp_slot_head) {
	slot = list_entry(tmp, struct slot, rpaphp_slot_list);
	list_del(&slot->rpaphp_slot_list);
	pci_hp_deregister(slot->hotplug_slot);
	}
	return;
	}

	static int __init rpaphp_init(void)
	{
	struct device_node *dn = NULL;

	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");

	while ((dn = of_find_node_by_name(dn, "pci")))
	rpaphp_add_slot(dn);

	return 0;
	}

	static void __exit rpaphp_exit(void)
	{
	cleanup_slots();
	}

	static int enable_slot(struct hotplug_slot *hotplug_slot)
	{
	struct slot slot = (struct slot )hotplug_slot->private;
	int state;
	int retval;

	if (slot->state == CONFIGURED)
	return 0;

	retval = rpaphp_get_sensor_state(slot, &state);
	if (retval)
	return retval;

	if (state == PRESENT) {
	pcibios_add_pci_devices(slot->bus);
	slot->state = CONFIGURED;
	} else if (state == EMPTY) {
	slot->state = EMPTY;
	} else {
	err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
	slot->state = NOT_VALID;
	return -EINVAL;
	}
	return 0;
	}

	static int disable_slot(struct hotplug_slot *hotplug_slot)
	{
	struct slot slot = (struct slot )hotplug_slot->private;
	if (slot->state == NOT_CONFIGURED)
	return -EINVAL;

	pcibios_remove_pci_devices(slot->bus);
	slot->state = NOT_CONFIGURED;
	return 0;
	}

	struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
	.enable_slot = enable_slot,
	.disable_slot = disable_slot,
	.set_attention_status = set_attention_status,
	.get_power_status = get_power_status,
	.get_attention_status = get_attention_status,
	.get_adapter_status = get_adapter_status,
	.get_max_bus_speed = get_max_bus_speed,
	};

	module_init(rpaphp_init);
	module_exit(rpaphp_exit);

	EXPORT_SYMBOL_GPL(rpaphp_add_slot);
	EXPORT_SYMBOL_GPL(rpaphp_slot_head);
	EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);