drivers/rapidio/rio.c - kernel/msm-4.9 - Gitiles

 /*
  * RapidIO interconnect services
  * (RapidIO Interconnect Specification, http://www.rapidio.org)
  *
  * Copyright 2005 MontaVista Software, Inc.
  * Matt Porter <mporter@kernel.crashing.org>
  *
  * 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.
  */

 #include <linux/config.h>
 #include <linux/types.h>
 #include <linux/kernel.h>

 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/rio.h>
 #include <linux/rio_drv.h>
 #include <linux/rio_ids.h>
 #include <linux/rio_regs.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>

 #include "rio.h"

 static LIST_HEAD(rio_mports);

 /**
  * rio_local_get_device_id - Get the base/extended device id for a port
  * @port: RIO master port from which to get the deviceid
  *
  * Reads the base/extended device id from the local device
  * implementing the master port. Returns the 8/16-bit device
  * id.
  */
 u16 rio_local_get_device_id(struct rio_mport *port)
 {
 	u32 result;

 	rio_local_read_config_32(port, RIO_DID_CSR, &result);

 	return (RIO_GET_DID(result));
 }

 /**
  * rio_request_inb_mbox - request inbound mailbox service
  * @mport: RIO master port from which to allocate the mailbox resource
  * @dev_id: Device specific pointer to pass on event
  * @mbox: Mailbox number to claim
  * @entries: Number of entries in inbound mailbox queue
  * @minb: Callback to execute when inbound message is received
  *
  * Requests ownership of an inbound mailbox resource and binds
  * a callback function to the resource. Returns %0 on success.
  */
 int rio_request_inb_mbox(struct rio_mport *mport,
 			 void *dev_id,
 			 int mbox,
 			 int entries,
 			 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
 				       int slot))
 {
 	int rc = 0;

 	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

 	if (res) {
 		rio_init_mbox_res(res, mbox, mbox);

 		/* Make sure this mailbox isn't in use */
 		if ((rc =
 		     request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
 				      res)) < 0) {
 			kfree(res);
 			goto out;
 		}

 		mport->inb_msg[mbox].res = res;

 		/* Hook the inbound message callback */
 		mport->inb_msg[mbox].mcback = minb;

 		rc = rio_open_inb_mbox(mport, dev_id, mbox, entries);
 	} else
 		rc = -ENOMEM;

       out:
 	return rc;
 }

 /**
  * rio_release_inb_mbox - release inbound mailbox message service
  * @mport: RIO master port from which to release the mailbox resource
  * @mbox: Mailbox number to release
  *
  * Releases ownership of an inbound mailbox resource. Returns 0
  * if the request has been satisfied.
  */
 int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
 {
 	rio_close_inb_mbox(mport, mbox);

 	/* Release the mailbox resource */
 	return release_resource(mport->inb_msg[mbox].res);
 }

 /**
  * rio_request_outb_mbox - request outbound mailbox service
  * @mport: RIO master port from which to allocate the mailbox resource
  * @dev_id: Device specific pointer to pass on event
  * @mbox: Mailbox number to claim
  * @entries: Number of entries in outbound mailbox queue
  * @moutb: Callback to execute when outbound message is sent
  *
  * Requests ownership of an outbound mailbox resource and binds
  * a callback function to the resource. Returns 0 on success.
  */
 int rio_request_outb_mbox(struct rio_mport *mport,
 			  void *dev_id,
 			  int mbox,
 			  int entries,
 			  void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
 {
 	int rc = 0;

 	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

 	if (res) {
 		rio_init_mbox_res(res, mbox, mbox);

 		/* Make sure this outbound mailbox isn't in use */
 		if ((rc =
 		     request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
 				      res)) < 0) {
 			kfree(res);
 			goto out;
 		}

 		mport->outb_msg[mbox].res = res;

 		/* Hook the inbound message callback */
 		mport->outb_msg[mbox].mcback = moutb;

 		rc = rio_open_outb_mbox(mport, dev_id, mbox, entries);
 	} else
 		rc = -ENOMEM;

       out:
 	return rc;
 }

 /**
  * rio_release_outb_mbox - release outbound mailbox message service
  * @mport: RIO master port from which to release the mailbox resource
  * @mbox: Mailbox number to release
  *
  * Releases ownership of an inbound mailbox resource. Returns 0
  * if the request has been satisfied.
  */
 int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
 {
 	rio_close_outb_mbox(mport, mbox);

 	/* Release the mailbox resource */
 	return release_resource(mport->outb_msg[mbox].res);
 }

 /**
  * rio_setup_inb_dbell - bind inbound doorbell callback
  * @mport: RIO master port to bind the doorbell callback
  * @dev_id: Device specific pointer to pass on event
  * @res: Doorbell message resource
  * @dinb: Callback to execute when doorbell is received
  *
  * Adds a doorbell resource/callback pair into a port's
  * doorbell event list. Returns 0 if the request has been
  * satisfied.
  */
 static int
 rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
 		    void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
 				  u16 info))
 {
 	int rc = 0;
 	struct rio_dbell *dbell;

 	if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
 		rc = -ENOMEM;
 		goto out;
 	}

 	dbell->res = res;
 	dbell->dinb = dinb;
 	dbell->dev_id = dev_id;

 	list_add_tail(&dbell->node, &mport->dbells);

       out:
 	return rc;
 }

 /**
  * rio_request_inb_dbell - request inbound doorbell message service
  * @mport: RIO master port from which to allocate the doorbell resource
  * @dev_id: Device specific pointer to pass on event
  * @start: Doorbell info range start
  * @end: Doorbell info range end
  * @dinb: Callback to execute when doorbell is received
  *
  * Requests ownership of an inbound doorbell resource and binds
  * a callback function to the resource. Returns 0 if the request
  * has been satisfied.
  */
 int rio_request_inb_dbell(struct rio_mport *mport,
 			  void *dev_id,
 			  u16 start,
 			  u16 end,
 			  void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
 					u16 dst, u16 info))
 {
 	int rc = 0;

 	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

 	if (res) {
 		rio_init_dbell_res(res, start, end);

 		/* Make sure these doorbells aren't in use */
 		if ((rc =
 		     request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
 				      res)) < 0) {
 			kfree(res);
 			goto out;
 		}

 		/* Hook the doorbell callback */
 		rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
 	} else
 		rc = -ENOMEM;

       out:
 	return rc;
 }

 /**
  * rio_release_inb_dbell - release inbound doorbell message service
  * @mport: RIO master port from which to release the doorbell resource
  * @start: Doorbell info range start
  * @end: Doorbell info range end
  *
  * Releases ownership of an inbound doorbell resource and removes
  * callback from the doorbell event list. Returns 0 if the request
  * has been satisfied.
  */
 int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
 {
 	int rc = 0, found = 0;
 	struct rio_dbell *dbell;

 	list_for_each_entry(dbell, &mport->dbells, node) {
 		if ((dbell->res->start == start) && (dbell->res->end == end)) {
 			found = 1;
 			break;
 		}
 	}

 	/* If we can't find an exact match, fail */
 	if (!found) {
 		rc = -EINVAL;
 		goto out;
 	}

 	/* Delete from list */
 	list_del(&dbell->node);

 	/* Release the doorbell resource */
 	rc = release_resource(dbell->res);

 	/* Free the doorbell event */
 	kfree(dbell);

       out:
 	return rc;
 }

 /**
  * rio_request_outb_dbell - request outbound doorbell message range
  * @rdev: RIO device from which to allocate the doorbell resource
  * @start: Doorbell message range start
  * @end: Doorbell message range end
  *
  * Requests ownership of a doorbell message range. Returns a resource
  * if the request has been satisfied or %NULL on failure.
  */
 struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
 					u16 end)
 {
 	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

 	if (res) {
 		rio_init_dbell_res(res, start, end);

 		/* Make sure these doorbells aren't in use */
 		if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
 		    < 0) {
 			kfree(res);
 			res = NULL;
 		}
 	}

 	return res;
 }

 /**
  * rio_release_outb_dbell - release outbound doorbell message range
  * @rdev: RIO device from which to release the doorbell resource
  * @res: Doorbell resource to be freed
  *
  * Releases ownership of a doorbell message range. Returns 0 if the
  * request has been satisfied.
  */
 int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
 {
 	int rc = release_resource(res);

 	kfree(res);

 	return rc;
 }

 /**
  * rio_mport_get_feature - query for devices' extended features
  * @port: Master port to issue transaction
  * @local: Indicate a local master port or remote device access
  * @destid: Destination ID of the device
  * @hopcount: Number of switch hops to the device
  * @ftr: Extended feature code
  *
  * Tell if a device supports a given RapidIO capability.
  * Returns the offset of the requested extended feature
  * block within the device's RIO configuration space or
  * 0 in case the device does not support it.  Possible
  * values for @ftr:
  *
  * %RIO_EFB_PAR_EP_ID		LP/LVDS EP Devices
  *
  * %RIO_EFB_PAR_EP_REC_ID	LP/LVDS EP Recovery Devices
  *
  * %RIO_EFB_PAR_EP_FREE_ID	LP/LVDS EP Free Devices
  *
  * %RIO_EFB_SER_EP_ID		LP/Serial EP Devices
  *
  * %RIO_EFB_SER_EP_REC_ID	LP/Serial EP Recovery Devices
  *
  * %RIO_EFB_SER_EP_FREE_ID	LP/Serial EP Free Devices
  */
 u32
 rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
 		      u8 hopcount, int ftr)
 {
 	u32 asm_info, ext_ftr_ptr, ftr_header;

 	if (local)
 		rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
 	else
 		rio_mport_read_config_32(port, destid, hopcount,
 					 RIO_ASM_INFO_CAR, &asm_info);

 	ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;

 	while (ext_ftr_ptr) {
 		if (local)
 			rio_local_read_config_32(port, ext_ftr_ptr,
 						 &ftr_header);
 		else
 			rio_mport_read_config_32(port, destid, hopcount,
 						 ext_ftr_ptr, &ftr_header);
 		if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
 			return ext_ftr_ptr;
 		if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
 			break;
 	}

 	return 0;
 }

 /**
  * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
  * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
  * @did: RIO did to match or %RIO_ANY_ID to match all dids
  * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
  * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
  * @from: Previous RIO device found in search, or %NULL for new search
  *
  * Iterates through the list of known RIO devices. If a RIO device is
  * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
  * count to the device is incrememted and a pointer to its device
  * structure is returned. Otherwise, %NULL is returned. A new search
  * is initiated by passing %NULL to the @from argument. Otherwise, if
  * @from is not %NULL, searches continue from next device on the global
  * list. The reference count for @from is always decremented if it is
  * not %NULL.
  */
 struct rio_dev *rio_get_asm(u16 vid, u16 did,
 			    u16 asm_vid, u16 asm_did, struct rio_dev *from)
 {
 	struct list_head *n;
 	struct rio_dev *rdev;

 	WARN_ON(in_interrupt());
 	spin_lock(&rio_global_list_lock);
 	n = from ? from->global_list.next : rio_devices.next;

 	while (n && (n != &rio_devices)) {
 		rdev = rio_dev_g(n);
 		if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
 		    (did == RIO_ANY_ID || rdev->did == did) &&
 		    (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
 		    (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
 			goto exit;
 		n = n->next;
 	}
 	rdev = NULL;
       exit:
 	rio_dev_put(from);
 	rdev = rio_dev_get(rdev);
 	spin_unlock(&rio_global_list_lock);
 	return rdev;
 }

 /**
  * rio_get_device - Begin or continue searching for a RIO device by vid/did
  * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
  * @did: RIO did to match or %RIO_ANY_ID to match all dids
  * @from: Previous RIO device found in search, or %NULL for new search
  *
  * Iterates through the list of known RIO devices. If a RIO device is
  * found with a matching @vid and @did, the reference count to the
  * device is incrememted and a pointer to its device structure is returned.
  * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
  * to the @from argument. Otherwise, if @from is not %NULL, searches
  * continue from next device on the global list. The reference count for
  * @from is always decremented if it is not %NULL.
  */
 struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
 {
 	return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
 }

 static void rio_fixup_device(struct rio_dev *dev)
 {
 }

 static int __devinit rio_init(void)
 {
 	struct rio_dev *dev = NULL;

 	while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
 		rio_fixup_device(dev);
 	}
 	return 0;
 }

 device_initcall(rio_init);

 int rio_init_mports(void)
 {
 	int rc = 0;
 	struct rio_mport *port;

 	list_for_each_entry(port, &rio_mports, node) {
 		if (!request_mem_region(port->iores.start,
 					port->iores.end - port->iores.start,
 					port->name)) {
 			printk(KERN_ERR
 			       "RIO: Error requesting master port region %8.8lx-%8.8lx\n",
 			       port->iores.start, port->iores.end - 1);
 			rc = -ENOMEM;
 			goto out;
 		}

 		if (port->host_deviceid >= 0)
 			rio_enum_mport(port);
 		else
 			rio_disc_mport(port);
 	}

       out:
 	return rc;
 }

 void rio_register_mport(struct rio_mport *port)
 {
 	list_add_tail(&port->node, &rio_mports);
 }

 EXPORT_SYMBOL_GPL(rio_local_get_device_id);
 EXPORT_SYMBOL_GPL(rio_get_device);
 EXPORT_SYMBOL_GPL(rio_get_asm);
 EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
 EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
 EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
 EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
 EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
 EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
 EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
 EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
	/*
	* RapidIO interconnect services
	* (RapidIO Interconnect Specification, http://www.rapidio.org)
	*
	* Copyright 2005 MontaVista Software, Inc.
	* Matt Porter <mporter@kernel.crashing.org>
	*
	* 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.
	*/

	#include <linux/config.h>
	#include <linux/types.h>
	#include <linux/kernel.h>

	#include <linux/delay.h>
	#include <linux/init.h>
	#include <linux/rio.h>
	#include <linux/rio_drv.h>
	#include <linux/rio_ids.h>
	#include <linux/rio_regs.h>
	#include <linux/module.h>
	#include <linux/spinlock.h>
	#include <linux/slab.h>

	#include "rio.h"

	static LIST_HEAD(rio_mports);

	/**
	* rio_local_get_device_id - Get the base/extended device id for a port
	* @port: RIO master port from which to get the deviceid
	*
	* Reads the base/extended device id from the local device
	* implementing the master port. Returns the 8/16-bit device
	* id.
	*/
	u16 rio_local_get_device_id(struct rio_mport *port)
	{
	u32 result;

	rio_local_read_config_32(port, RIO_DID_CSR, &result);

	return (RIO_GET_DID(result));
	}

	/**
	* rio_request_inb_mbox - request inbound mailbox service
	* @mport: RIO master port from which to allocate the mailbox resource
	* @dev_id: Device specific pointer to pass on event
	* @mbox: Mailbox number to claim
	* @entries: Number of entries in inbound mailbox queue
	* @minb: Callback to execute when inbound message is received
	*
	* Requests ownership of an inbound mailbox resource and binds
	* a callback function to the resource. Returns %0 on success.
	*/
	int rio_request_inb_mbox(struct rio_mport *mport,
	void *dev_id,
	int mbox,
	int entries,
	void (minb) (struct rio_mport mport, void *dev_id, int mbox,
	int slot))
	{
	int rc = 0;

	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
	rio_init_mbox_res(res, mbox, mbox);

	/* Make sure this mailbox isn't in use */
	if ((rc =
	request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
	res)) < 0) {
	kfree(res);
	goto out;
	}

	mport->inb_msg[mbox].res = res;

	/* Hook the inbound message callback */
	mport->inb_msg[mbox].mcback = minb;

	rc = rio_open_inb_mbox(mport, dev_id, mbox, entries);
	} else
	rc = -ENOMEM;

	out:
	return rc;
	}

	/**
	* rio_release_inb_mbox - release inbound mailbox message service
	* @mport: RIO master port from which to release the mailbox resource
	* @mbox: Mailbox number to release
	*
	* Releases ownership of an inbound mailbox resource. Returns 0
	* if the request has been satisfied.
	*/
	int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
	{
	rio_close_inb_mbox(mport, mbox);

	/* Release the mailbox resource */
	return release_resource(mport->inb_msg[mbox].res);
	}

	/**
	* rio_request_outb_mbox - request outbound mailbox service
	* @mport: RIO master port from which to allocate the mailbox resource
	* @dev_id: Device specific pointer to pass on event
	* @mbox: Mailbox number to claim
	* @entries: Number of entries in outbound mailbox queue
	* @moutb: Callback to execute when outbound message is sent
	*
	* Requests ownership of an outbound mailbox resource and binds
	* a callback function to the resource. Returns 0 on success.
	*/
	int rio_request_outb_mbox(struct rio_mport *mport,
	void *dev_id,
	int mbox,
	int entries,
	void (moutb) (struct rio_mport mport, void *dev_id, int mbox, int slot))
	{
	int rc = 0;

	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
	rio_init_mbox_res(res, mbox, mbox);

	/* Make sure this outbound mailbox isn't in use */
	if ((rc =
	request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
	res)) < 0) {
	kfree(res);
	goto out;
	}

	mport->outb_msg[mbox].res = res;

	/* Hook the inbound message callback */
	mport->outb_msg[mbox].mcback = moutb;

	rc = rio_open_outb_mbox(mport, dev_id, mbox, entries);
	} else
	rc = -ENOMEM;

	out:
	return rc;
	}

	/**
	* rio_release_outb_mbox - release outbound mailbox message service
	* @mport: RIO master port from which to release the mailbox resource
	* @mbox: Mailbox number to release
	*
	* Releases ownership of an inbound mailbox resource. Returns 0
	* if the request has been satisfied.
	*/
	int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
	{
	rio_close_outb_mbox(mport, mbox);

	/* Release the mailbox resource */
	return release_resource(mport->outb_msg[mbox].res);
	}

	/**
	* rio_setup_inb_dbell - bind inbound doorbell callback
	* @mport: RIO master port to bind the doorbell callback
	* @dev_id: Device specific pointer to pass on event
	* @res: Doorbell message resource
	* @dinb: Callback to execute when doorbell is received
	*
	* Adds a doorbell resource/callback pair into a port's
	* doorbell event list. Returns 0 if the request has been
	* satisfied.
	*/
	static int
	rio_setup_inb_dbell(struct rio_mport mport, void dev_id, struct resource *res,
	void (dinb) (struct rio_mport mport, void *dev_id, u16 src, u16 dst,
	u16 info))
	{
	int rc = 0;
	struct rio_dbell *dbell;

	if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
	rc = -ENOMEM;
	goto out;
	}

	dbell->res = res;
	dbell->dinb = dinb;
	dbell->dev_id = dev_id;

	list_add_tail(&dbell->node, &mport->dbells);

	out:
	return rc;
	}

	/**
	* rio_request_inb_dbell - request inbound doorbell message service
	* @mport: RIO master port from which to allocate the doorbell resource
	* @dev_id: Device specific pointer to pass on event
	* @start: Doorbell info range start
	* @end: Doorbell info range end
	* @dinb: Callback to execute when doorbell is received
	*
	* Requests ownership of an inbound doorbell resource and binds
	* a callback function to the resource. Returns 0 if the request
	* has been satisfied.
	*/
	int rio_request_inb_dbell(struct rio_mport *mport,
	void *dev_id,
	u16 start,
	u16 end,
	void (dinb) (struct rio_mport mport, void *dev_id, u16 src,
	u16 dst, u16 info))
	{
	int rc = 0;

	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
	rio_init_dbell_res(res, start, end);

	/* Make sure these doorbells aren't in use */
	if ((rc =
	request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
	res)) < 0) {
	kfree(res);
	goto out;
	}

	/* Hook the doorbell callback */
	rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
	} else
	rc = -ENOMEM;

	out:
	return rc;
	}

	/**
	* rio_release_inb_dbell - release inbound doorbell message service
	* @mport: RIO master port from which to release the doorbell resource
	* @start: Doorbell info range start
	* @end: Doorbell info range end
	*
	* Releases ownership of an inbound doorbell resource and removes
	* callback from the doorbell event list. Returns 0 if the request
	* has been satisfied.
	*/
	int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
	{
	int rc = 0, found = 0;
	struct rio_dbell *dbell;

	list_for_each_entry(dbell, &mport->dbells, node) {
	if ((dbell->res->start == start) && (dbell->res->end == end)) {
	found = 1;
	break;
	}
	}

	/* If we can't find an exact match, fail */
	if (!found) {
	rc = -EINVAL;
	goto out;
	}

	/* Delete from list */
	list_del(&dbell->node);

	/* Release the doorbell resource */
	rc = release_resource(dbell->res);

	/* Free the doorbell event */
	kfree(dbell);

	out:
	return rc;
	}

	/**
	* rio_request_outb_dbell - request outbound doorbell message range
	* @rdev: RIO device from which to allocate the doorbell resource
	* @start: Doorbell message range start
	* @end: Doorbell message range end
	*
	* Requests ownership of a doorbell message range. Returns a resource
	* if the request has been satisfied or %NULL on failure.
	*/
	struct resource rio_request_outb_dbell(struct rio_dev rdev, u16 start,
	u16 end)
	{
	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
	rio_init_dbell_res(res, start, end);

	/* Make sure these doorbells aren't in use */
	if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
	< 0) {
	kfree(res);
	res = NULL;
	}
	}

	return res;
	}

	/**
	* rio_release_outb_dbell - release outbound doorbell message range
	* @rdev: RIO device from which to release the doorbell resource
	* @res: Doorbell resource to be freed
	*
	* Releases ownership of a doorbell message range. Returns 0 if the
	* request has been satisfied.
	*/
	int rio_release_outb_dbell(struct rio_dev rdev, struct resource res)
	{
	int rc = release_resource(res);

	kfree(res);

	return rc;
	}

	/**
	* rio_mport_get_feature - query for devices' extended features
	* @port: Master port to issue transaction
	* @local: Indicate a local master port or remote device access
	* @destid: Destination ID of the device
	* @hopcount: Number of switch hops to the device
	* @ftr: Extended feature code
	*
	* Tell if a device supports a given RapidIO capability.
	* Returns the offset of the requested extended feature
	* block within the device's RIO configuration space or
	* 0 in case the device does not support it. Possible
	* values for @ftr:
	*
	* %RIO_EFB_PAR_EP_ID LP/LVDS EP Devices
	*
	* %RIO_EFB_PAR_EP_REC_ID LP/LVDS EP Recovery Devices
	*
	* %RIO_EFB_PAR_EP_FREE_ID LP/LVDS EP Free Devices
	*
	* %RIO_EFB_SER_EP_ID LP/Serial EP Devices
	*
	* %RIO_EFB_SER_EP_REC_ID LP/Serial EP Recovery Devices
	*
	* %RIO_EFB_SER_EP_FREE_ID LP/Serial EP Free Devices
	*/
	u32
	rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
	u8 hopcount, int ftr)
	{
	u32 asm_info, ext_ftr_ptr, ftr_header;

	if (local)
	rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
	else
	rio_mport_read_config_32(port, destid, hopcount,
	RIO_ASM_INFO_CAR, &asm_info);

	ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;

	while (ext_ftr_ptr) {
	if (local)
	rio_local_read_config_32(port, ext_ftr_ptr,
	&ftr_header);
	else
	rio_mport_read_config_32(port, destid, hopcount,
	ext_ftr_ptr, &ftr_header);
	if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
	return ext_ftr_ptr;
	if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
	break;
	}

	return 0;
	}

	/**
	* rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
	* @vid: RIO vid to match or %RIO_ANY_ID to match all vids
	* @did: RIO did to match or %RIO_ANY_ID to match all dids
	* @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
	* @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
	* @from: Previous RIO device found in search, or %NULL for new search
	*
	* Iterates through the list of known RIO devices. If a RIO device is
	* found with a matching @vid, @did, @asm_vid, @asm_did, the reference
	* count to the device is incrememted and a pointer to its device
	* structure is returned. Otherwise, %NULL is returned. A new search
	* is initiated by passing %NULL to the @from argument. Otherwise, if
	* @from is not %NULL, searches continue from next device on the global
	* list. The reference count for @from is always decremented if it is
	* not %NULL.
	*/
	struct rio_dev *rio_get_asm(u16 vid, u16 did,
	u16 asm_vid, u16 asm_did, struct rio_dev *from)
	{
	struct list_head *n;
	struct rio_dev *rdev;

	WARN_ON(in_interrupt());
	spin_lock(&rio_global_list_lock);
	n = from ? from->global_list.next : rio_devices.next;

	while (n && (n != &rio_devices)) {
	rdev = rio_dev_g(n);
	if ((vid == RIO_ANY_ID \|\| rdev->vid == vid) &&
	(did == RIO_ANY_ID \|\| rdev->did == did) &&
	(asm_vid == RIO_ANY_ID \|\| rdev->asm_vid == asm_vid) &&
	(asm_did == RIO_ANY_ID \|\| rdev->asm_did == asm_did))
	goto exit;
	n = n->next;
	}
	rdev = NULL;
	exit:
	rio_dev_put(from);
	rdev = rio_dev_get(rdev);
	spin_unlock(&rio_global_list_lock);
	return rdev;
	}

	/**
	* rio_get_device - Begin or continue searching for a RIO device by vid/did
	* @vid: RIO vid to match or %RIO_ANY_ID to match all vids
	* @did: RIO did to match or %RIO_ANY_ID to match all dids
	* @from: Previous RIO device found in search, or %NULL for new search
	*
	* Iterates through the list of known RIO devices. If a RIO device is
	* found with a matching @vid and @did, the reference count to the
	* device is incrememted and a pointer to its device structure is returned.
	* Otherwise, %NULL is returned. A new search is initiated by passing %NULL
	* to the @from argument. Otherwise, if @from is not %NULL, searches
	* continue from next device on the global list. The reference count for
	* @from is always decremented if it is not %NULL.
	*/
	struct rio_dev rio_get_device(u16 vid, u16 did, struct rio_dev from)
	{
	return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
	}

	static void rio_fixup_device(struct rio_dev *dev)
	{
	}

	static int __devinit rio_init(void)
	{
	struct rio_dev *dev = NULL;

	while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
	rio_fixup_device(dev);
	}
	return 0;
	}

	device_initcall(rio_init);

	int rio_init_mports(void)
	{
	int rc = 0;
	struct rio_mport *port;

	list_for_each_entry(port, &rio_mports, node) {
	if (!request_mem_region(port->iores.start,
	port->iores.end - port->iores.start,
	port->name)) {
	printk(KERN_ERR
	"RIO: Error requesting master port region %8.8lx-%8.8lx\n",
	port->iores.start, port->iores.end - 1);
	rc = -ENOMEM;
	goto out;
	}

	if (port->host_deviceid >= 0)
	rio_enum_mport(port);
	else
	rio_disc_mport(port);
	}

	out:
	return rc;
	}

	void rio_register_mport(struct rio_mport *port)
	{
	list_add_tail(&port->node, &rio_mports);
	}

	EXPORT_SYMBOL_GPL(rio_local_get_device_id);
	EXPORT_SYMBOL_GPL(rio_get_device);
	EXPORT_SYMBOL_GPL(rio_get_asm);
	EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
	EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
	EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
	EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
	EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
	EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
	EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
	EXPORT_SYMBOL_GPL(rio_release_outb_mbox);