rio.c 63.3 KB
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/*
 * RapidIO interconnect services
 * (RapidIO Interconnect Specification, http://www.rapidio.org)
 *
 * Copyright 2005 MontaVista Software, Inc.
 * Matt Porter <mporter@kernel.crashing.org>
 *
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 * Copyright 2009 - 2013 Integrated Device Technology, Inc.
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 * Alex Bounine <alexandre.bounine@idt.com>
 *
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 * 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/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>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include "rio.h"

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/*
 * struct rio_pwrite - RIO portwrite event
 * @node:    Node in list of doorbell events
 * @pwcback: Doorbell event callback
 * @context: Handler specific context to pass on event
 */
struct rio_pwrite {
	struct list_head node;

	int (*pwcback)(struct rio_mport *mport, void *context,
		       union rio_pw_msg *msg, int step);
	void *context;
};

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MODULE_DESCRIPTION("RapidIO Subsystem Core");
MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>");
MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
MODULE_LICENSE("GPL");

static int hdid[RIO_MAX_MPORTS];
static int ids_num;
module_param_array(hdid, int, &ids_num, 0);
MODULE_PARM_DESC(hdid,
	"Destination ID assignment to local RapidIO controllers");

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static LIST_HEAD(rio_devices);
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static LIST_HEAD(rio_nets);
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static DEFINE_SPINLOCK(rio_global_list_lock);

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static LIST_HEAD(rio_mports);
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static LIST_HEAD(rio_scans);
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static DEFINE_MUTEX(rio_mport_list_lock);
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static unsigned char next_portid;
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static DEFINE_SPINLOCK(rio_mmap_lock);
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/**
 * 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);

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	return (RIO_GET_DID(port->sys_size, result));
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}

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/**
 * rio_query_mport - Query mport device attributes
 * @port: mport device to query
 * @mport_attr: mport attributes data structure
 *
 * Returns attributes of specified mport through the
 * pointer to attributes data structure.
 */
int rio_query_mport(struct rio_mport *port,
		    struct rio_mport_attr *mport_attr)
{
	if (!port->ops->query_mport)
		return -ENODATA;
	return port->ops->query_mport(port, mport_attr);
}
EXPORT_SYMBOL(rio_query_mport);

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/**
 * rio_alloc_net- Allocate and initialize a new RIO network data structure
 * @mport: Master port associated with the RIO network
 *
 * Allocates a RIO network structure, initializes per-network
 * list heads, and adds the associated master port to the
 * network list of associated master ports. Returns a
 * RIO network pointer on success or %NULL on failure.
 */
struct rio_net *rio_alloc_net(struct rio_mport *mport)
{
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	struct rio_net *net = kzalloc(sizeof(*net), GFP_KERNEL);
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	if (net) {
		INIT_LIST_HEAD(&net->node);
		INIT_LIST_HEAD(&net->devices);
		INIT_LIST_HEAD(&net->switches);
		INIT_LIST_HEAD(&net->mports);
		mport->net = net;
	}
	return net;
}
EXPORT_SYMBOL_GPL(rio_alloc_net);

int rio_add_net(struct rio_net *net)
{
	int err;

	err = device_register(&net->dev);
	if (err)
		return err;
	spin_lock(&rio_global_list_lock);
	list_add_tail(&net->node, &rio_nets);
	spin_unlock(&rio_global_list_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(rio_add_net);

void rio_free_net(struct rio_net *net)
{
	spin_lock(&rio_global_list_lock);
	if (!list_empty(&net->node))
		list_del(&net->node);
	spin_unlock(&rio_global_list_lock);
	if (net->release)
		net->release(net);
	device_unregister(&net->dev);
}
EXPORT_SYMBOL_GPL(rio_free_net);

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/**
 * rio_local_set_device_id - Set the base/extended device id for a port
 * @port: RIO master port
 * @did: Device ID value to be written
 *
 * Writes the base/extended device id from a device.
 */
void rio_local_set_device_id(struct rio_mport *port, u16 did)
{
	rio_local_write_config_32(port, RIO_DID_CSR,
				  RIO_SET_DID(port->sys_size, did));
}
EXPORT_SYMBOL_GPL(rio_local_set_device_id);

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/**
 * rio_add_device- Adds a RIO device to the device model
 * @rdev: RIO device
 *
 * Adds the RIO device to the global device list and adds the RIO
 * device to the RIO device list.  Creates the generic sysfs nodes
 * for an RIO device.
 */
int rio_add_device(struct rio_dev *rdev)
{
	int err;

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	atomic_set(&rdev->state, RIO_DEVICE_RUNNING);
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	err = device_register(&rdev->dev);
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	if (err)
		return err;

	spin_lock(&rio_global_list_lock);
	list_add_tail(&rdev->global_list, &rio_devices);
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	if (rdev->net) {
		list_add_tail(&rdev->net_list, &rdev->net->devices);
		if (rdev->pef & RIO_PEF_SWITCH)
			list_add_tail(&rdev->rswitch->node,
				      &rdev->net->switches);
	}
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	spin_unlock(&rio_global_list_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(rio_add_device);

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/*
 * rio_del_device - removes a RIO device from the device model
 * @rdev: RIO device
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 * @state: device state to set during removal process
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 *
 * Removes the RIO device to the kernel device list and subsystem's device list.
 * Clears sysfs entries for the removed device.
 */
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void rio_del_device(struct rio_dev *rdev, enum rio_device_state state)
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{
	pr_debug("RIO: %s: removing %s\n", __func__, rio_name(rdev));
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	atomic_set(&rdev->state, state);
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	spin_lock(&rio_global_list_lock);
	list_del(&rdev->global_list);
	if (rdev->net) {
		list_del(&rdev->net_list);
		if (rdev->pef & RIO_PEF_SWITCH) {
			list_del(&rdev->rswitch->node);
			kfree(rdev->rswitch->route_table);
		}
	}
	spin_unlock(&rio_global_list_lock);
	device_unregister(&rdev->dev);
}
EXPORT_SYMBOL_GPL(rio_del_device);

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/**
 * rio_request_inb_mbox - request inbound mailbox service
 * @mport: RIO master port from which to allocate the mailbox resource
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 * @dev_id: Device specific pointer to pass on event
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 * @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,
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			 void *dev_id,
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			 int mbox,
			 int entries,
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			 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
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				       int slot))
{
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	int rc = -ENOSYS;
	struct resource *res;
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	if (!mport->ops->open_inb_mbox)
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		goto out;

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	res = kzalloc(sizeof(*res), GFP_KERNEL);
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	if (res) {
		rio_init_mbox_res(res, mbox, mbox);

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

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

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

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		rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
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		if (rc) {
			mport->inb_msg[mbox].mcback = NULL;
			mport->inb_msg[mbox].res = NULL;
			release_resource(res);
			kfree(res);
		}
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	} 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)
{
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	int rc;
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	if (!mport->ops->close_inb_mbox || !mport->inb_msg[mbox].res)
		return -EINVAL;

	mport->ops->close_inb_mbox(mport, mbox);
	mport->inb_msg[mbox].mcback = NULL;

	rc = release_resource(mport->inb_msg[mbox].res);
	if (rc)
		return rc;

	kfree(mport->inb_msg[mbox].res);
	mport->inb_msg[mbox].res = NULL;

	return 0;
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}

/**
 * rio_request_outb_mbox - request outbound mailbox service
 * @mport: RIO master port from which to allocate the mailbox resource
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 * @dev_id: Device specific pointer to pass on event
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 * @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,
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			  void *dev_id,
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			  int mbox,
			  int entries,
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			  void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
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{
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	int rc = -ENOSYS;
	struct resource *res;
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	if (!mport->ops->open_outb_mbox)
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		goto out;

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	res = kzalloc(sizeof(*res), GFP_KERNEL);
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	if (res) {
		rio_init_mbox_res(res, mbox, mbox);

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

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

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

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		rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
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		if (rc) {
			mport->outb_msg[mbox].mcback = NULL;
			mport->outb_msg[mbox].res = NULL;
			release_resource(res);
			kfree(res);
		}
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	} 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)
{
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	int rc;
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	if (!mport->ops->close_outb_mbox || !mport->outb_msg[mbox].res)
		return -EINVAL;

	mport->ops->close_outb_mbox(mport, mbox);
	mport->outb_msg[mbox].mcback = NULL;

	rc = release_resource(mport->outb_msg[mbox].res);
	if (rc)
		return rc;

	kfree(mport->outb_msg[mbox].res);
	mport->outb_msg[mbox].res = NULL;

	return 0;
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}

/**
 * rio_setup_inb_dbell - bind inbound doorbell callback
 * @mport: RIO master port to bind the doorbell callback
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 * @dev_id: Device specific pointer to pass on event
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 * @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
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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,
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				  u16 info))
{
	int rc = 0;
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	struct rio_dbell *dbell = kmalloc(sizeof(*dbell), GFP_KERNEL);
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	if (!dbell) {
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		rc = -ENOMEM;
		goto out;
	}

	dbell->res = res;
	dbell->dinb = dinb;
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	dbell->dev_id = dev_id;
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	mutex_lock(&mport->lock);
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	list_add_tail(&dbell->node, &mport->dbells);
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	mutex_unlock(&mport->lock);
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      out:
	return rc;
}

/**
 * rio_request_inb_dbell - request inbound doorbell message service
 * @mport: RIO master port from which to allocate the doorbell resource
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 * @dev_id: Device specific pointer to pass on event
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 * @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,
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			  void *dev_id,
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			  u16 start,
			  u16 end,
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			  void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
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					u16 dst, u16 info))
{
	int rc = 0;
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	struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
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	if (res) {
		rio_init_dbell_res(res, start, end);

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

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

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	mutex_lock(&mport->lock);
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	list_for_each_entry(dbell, &mport->dbells, node) {
		if ((dbell->res->start == start) && (dbell->res->end == end)) {
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			list_del(&dbell->node);
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			found = 1;
			break;
		}
	}
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	mutex_unlock(&mport->lock);
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	/* If we can't find an exact match, fail */
	if (!found) {
		rc = -EINVAL;
		goto out;
	}

	/* 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)
{
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	struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);
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	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;
}

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/**
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 * rio_add_mport_pw_handler - add port-write message handler into the list
 *                            of mport specific pw handlers
 * @mport:   RIO master port to bind the portwrite callback
 * @context: Handler specific context to pass on event
 * @pwcback: Callback to execute when portwrite is received
 *
 * Returns 0 if the request has been satisfied.
 */
int rio_add_mport_pw_handler(struct rio_mport *mport, void *context,
			     int (*pwcback)(struct rio_mport *mport,
			     void *context, union rio_pw_msg *msg, int step))
{
	int rc = 0;
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	struct rio_pwrite *pwrite = kzalloc(sizeof(*pwrite), GFP_KERNEL);
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	if (!pwrite) {
		rc = -ENOMEM;
		goto out;
	}

	pwrite->pwcback = pwcback;
	pwrite->context = context;
	mutex_lock(&mport->lock);
	list_add_tail(&pwrite->node, &mport->pwrites);
	mutex_unlock(&mport->lock);
out:
	return rc;
}
EXPORT_SYMBOL_GPL(rio_add_mport_pw_handler);

/**
 * rio_del_mport_pw_handler - remove port-write message handler from the list
 *                            of mport specific pw handlers
 * @mport:   RIO master port to bind the portwrite callback
 * @context: Registered handler specific context to pass on event
 * @pwcback: Registered callback function
 *
 * Returns 0 if the request has been satisfied.
 */
int rio_del_mport_pw_handler(struct rio_mport *mport, void *context,
			     int (*pwcback)(struct rio_mport *mport,
			     void *context, union rio_pw_msg *msg, int step))
{
	int rc = -EINVAL;
	struct rio_pwrite *pwrite;

	mutex_lock(&mport->lock);
	list_for_each_entry(pwrite, &mport->pwrites, node) {
		if (pwrite->pwcback == pwcback && pwrite->context == context) {
			list_del(&pwrite->node);
			kfree(pwrite);
			rc = 0;
			break;
		}
	}
	mutex_unlock(&mport->lock);

	return rc;
}
EXPORT_SYMBOL_GPL(rio_del_mport_pw_handler);

/**
 * rio_request_inb_pwrite - request inbound port-write message service for
 *                          specific RapidIO device
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 * @rdev: RIO device to which register inbound port-write callback routine
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 * @pwcback: Callback routine to execute when port-write is received
 *
 * Binds a port-write callback function to the RapidIO device.
 * Returns 0 if the request has been satisfied.
 */
int rio_request_inb_pwrite(struct rio_dev *rdev,
	int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
{
	int rc = 0;

	spin_lock(&rio_global_list_lock);
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	if (rdev->pwcback)
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		rc = -ENOMEM;
	else
		rdev->pwcback = pwcback;

	spin_unlock(&rio_global_list_lock);
	return rc;
}
EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);

/**
 * rio_release_inb_pwrite - release inbound port-write message service
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 *                          associated with specific RapidIO device
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 * @rdev: RIO device which registered for inbound port-write callback
 *
 * Removes callback from the rio_dev structure. Returns 0 if the request
 * has been satisfied.
 */
int rio_release_inb_pwrite(struct rio_dev *rdev)
{
	int rc = -ENOMEM;

	spin_lock(&rio_global_list_lock);
	if (rdev->pwcback) {
		rdev->pwcback = NULL;
		rc = 0;
	}

	spin_unlock(&rio_global_list_lock);
	return rc;
}
EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);

663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680
/**
 * rio_pw_enable - Enables/disables port-write handling by a master port
 * @mport: Master port associated with port-write handling
 * @enable:  1=enable,  0=disable
 */
void rio_pw_enable(struct rio_mport *mport, int enable)
{
	if (mport->ops->pwenable) {
		mutex_lock(&mport->lock);

		if ((enable && ++mport->pwe_refcnt == 1) ||
		    (!enable && mport->pwe_refcnt && --mport->pwe_refcnt == 0))
			mport->ops->pwenable(mport, enable);
		mutex_unlock(&mport->lock);
	}
}
EXPORT_SYMBOL_GPL(rio_pw_enable);

681 682 683
/**
 * rio_map_inb_region -- Map inbound memory region.
 * @mport: Master port.
R
Randy Dunlap 已提交
684
 * @local: physical address of memory region to be mapped
685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723
 * @rbase: RIO base address assigned to this window
 * @size: Size of the memory region
 * @rflags: Flags for mapping.
 *
 * Return: 0 -- Success.
 *
 * This function will create the mapping from RIO space to local memory.
 */
int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
			u64 rbase, u32 size, u32 rflags)
{
	int rc = 0;
	unsigned long flags;

	if (!mport->ops->map_inb)
		return -1;
	spin_lock_irqsave(&rio_mmap_lock, flags);
	rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
	spin_unlock_irqrestore(&rio_mmap_lock, flags);
	return rc;
}
EXPORT_SYMBOL_GPL(rio_map_inb_region);

/**
 * rio_unmap_inb_region -- Unmap the inbound memory region
 * @mport: Master port
 * @lstart: physical address of memory region to be unmapped
 */
void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
{
	unsigned long flags;
	if (!mport->ops->unmap_inb)
		return;
	spin_lock_irqsave(&rio_mmap_lock, flags);
	mport->ops->unmap_inb(mport, lstart);
	spin_unlock_irqrestore(&rio_mmap_lock, flags);
}
EXPORT_SYMBOL_GPL(rio_unmap_inb_region);

724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
/**
 * rio_map_outb_region -- Map outbound memory region.
 * @mport: Master port.
 * @destid: destination id window points to
 * @rbase: RIO base address window translates to
 * @size: Size of the memory region
 * @rflags: Flags for mapping.
 * @local: physical address of memory region mapped
 *
 * Return: 0 -- Success.
 *
 * This function will create the mapping from RIO space to local memory.
 */
int rio_map_outb_region(struct rio_mport *mport, u16 destid, u64 rbase,
			u32 size, u32 rflags, dma_addr_t *local)
{
	int rc = 0;
	unsigned long flags;

	if (!mport->ops->map_outb)
		return -ENODEV;

	spin_lock_irqsave(&rio_mmap_lock, flags);
	rc = mport->ops->map_outb(mport, destid, rbase, size,
		rflags, local);
	spin_unlock_irqrestore(&rio_mmap_lock, flags);

	return rc;
}
EXPORT_SYMBOL_GPL(rio_map_outb_region);

/**
 * rio_unmap_inb_region -- Unmap the inbound memory region
 * @mport: Master port
 * @destid: destination id mapping points to
 * @rstart: RIO base address window translates to
 */
void rio_unmap_outb_region(struct rio_mport *mport, u16 destid, u64 rstart)
{
	unsigned long flags;

	if (!mport->ops->unmap_outb)
		return;

	spin_lock_irqsave(&rio_mmap_lock, flags);
	mport->ops->unmap_outb(mport, destid, rstart);
	spin_unlock_irqrestore(&rio_mmap_lock, flags);
}
EXPORT_SYMBOL_GPL(rio_unmap_outb_region);

774 775 776
/**
 * rio_mport_get_physefb - Helper function that returns register offset
 *                      for Physical Layer Extended Features Block.
777 778 779 780
 * @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
781
 * @rmap: pointer to location to store register map type info
782 783 784
 */
u32
rio_mport_get_physefb(struct rio_mport *port, int local,
785
		      u16 destid, u8 hopcount, u32 *rmap)
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
{
	u32 ext_ftr_ptr;
	u32 ftr_header;

	ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);

	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);

		ftr_header = RIO_GET_BLOCK_ID(ftr_header);
		switch (ftr_header) {

		case RIO_EFB_SER_EP_ID:
		case RIO_EFB_SER_EP_REC_ID:
		case RIO_EFB_SER_EP_FREE_ID:
806 807 808 809 810 811
		case RIO_EFB_SER_EP_M1_ID:
		case RIO_EFB_SER_EP_SW_M1_ID:
		case RIO_EFB_SER_EPF_M1_ID:
		case RIO_EFB_SER_EPF_SW_M1_ID:
			*rmap = 1;
			return ext_ftr_ptr;
812

813 814 815 816 817
		case RIO_EFB_SER_EP_M2_ID:
		case RIO_EFB_SER_EP_SW_M2_ID:
		case RIO_EFB_SER_EPF_M2_ID:
		case RIO_EFB_SER_EPF_SW_M2_ID:
			*rmap = 2;
818 819 820 821 822 823 824 825 826 827 828 829
			return ext_ftr_ptr;

		default:
			break;
		}

		ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
						hopcount, ext_ftr_ptr);
	}

	return ext_ftr_ptr;
}
830
EXPORT_SYMBOL_GPL(rio_mport_get_physefb);
831 832 833

/**
 * rio_get_comptag - Begin or continue searching for a RIO device by component tag
834
 * @comp_tag: RIO component tag to match
835 836 837 838 839 840 841 842 843
 * @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 @comp_tag, 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.
 */
844
struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862
{
	struct list_head *n;
	struct rio_dev *rdev;

	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 (rdev->comp_tag == comp_tag)
			goto exit;
		n = n->next;
	}
	rdev = NULL;
exit:
	spin_unlock(&rio_global_list_lock);
	return rdev;
}
863
EXPORT_SYMBOL_GPL(rio_get_comptag);
864 865 866 867 868 869 870 871 872 873 874

/**
 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
 * @rdev: Pointer to RIO device control structure
 * @pnum: Switch port number to set LOCKOUT bit
 * @lock: Operation : set (=1) or clear (=0)
 */
int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
{
	u32 regval;

875
	rio_read_config_32(rdev,
876 877
		RIO_DEV_PORT_N_CTL_CSR(rdev, pnum),
		&regval);
878 879 880 881 882
	if (lock)
		regval |= RIO_PORT_N_CTL_LOCKOUT;
	else
		regval &= ~RIO_PORT_N_CTL_LOCKOUT;

883
	rio_write_config_32(rdev,
884 885
		RIO_DEV_PORT_N_CTL_CSR(rdev, pnum),
		regval);
886 887
	return 0;
}
888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
EXPORT_SYMBOL_GPL(rio_set_port_lockout);

/**
 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
 * given port
 * @port: Master port associated with the RIO network
 * @local: local=1 select local port otherwise a far device is reached
 * @destid: Destination ID of the device to check host bit
 * @hopcount: Number of hops to reach the target
 * @port_num: Port (-number on switch) to enable on a far end device
 *
 * Returns 0 or 1 from on General Control Command and Status Register
 * (EXT_PTR+0x3C)
 */
int rio_enable_rx_tx_port(struct rio_mport *port,
			  int local, u16 destid,
			  u8 hopcount, u8 port_num)
{
#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
	u32 regval;
	u32 ext_ftr_ptr;
909
	u32 rmap;
910 911 912 913 914 915 916

	/*
	* enable rx input tx output port
	*/
	pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
		 "%d, port_num = %d)\n", local, destid, hopcount, port_num);

917 918
	ext_ftr_ptr = rio_mport_get_physefb(port, local, destid,
					    hopcount, &rmap);
919 920

	if (local) {
921 922
		rio_local_read_config_32(port,
				ext_ftr_ptr + RIO_PORT_N_CTL_CSR(0, rmap),
923 924 925
				&regval);
	} else {
		if (rio_mport_read_config_32(port, destid, hopcount,
926 927
			ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num, rmap),
				&regval) < 0)
928 929 930
			return -EIO;
	}

931
	regval = regval | RIO_PORT_N_CTL_EN_RX | RIO_PORT_N_CTL_EN_TX;
932 933

	if (local) {
934 935
		rio_local_write_config_32(port,
			ext_ftr_ptr + RIO_PORT_N_CTL_CSR(0, rmap), regval);
936 937
	} else {
		if (rio_mport_write_config_32(port, destid, hopcount,
938 939
			ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num, rmap),
				regval) < 0)
940 941 942 943 944 945 946
			return -EIO;
	}
#endif
	return 0;
}
EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port);

947

948 949 950 951 952 953 954 955 956 957 958 959 960
/**
 * rio_chk_dev_route - Validate route to the specified device.
 * @rdev:  RIO device failed to respond
 * @nrdev: Last active device on the route to rdev
 * @npnum: nrdev's port number on the route to rdev
 *
 * Follows a route to the specified RIO device to determine the last available
 * device (and corresponding RIO port) on the route.
 */
static int
rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
{
	u32 result;
961
	int p_port, rc = -EIO;
962 963 964 965 966 967 968 969 970 971 972
	struct rio_dev *prev = NULL;

	/* Find switch with failed RIO link */
	while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
		if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
			prev = rdev->prev;
			break;
		}
		rdev = rdev->prev;
	}

973
	if (!prev)
974 975
		goto err_out;

976
	p_port = prev->rswitch->route_table[rdev->destid];
977

978
	if (p_port != RIO_INVALID_ROUTE) {
979 980 981 982 983 984
		pr_debug("RIO: link failed on [%s]-P%d\n",
			 rio_name(prev), p_port);
		*nrdev = prev;
		*npnum = p_port;
		rc = 0;
	} else
985
		pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
986 987 988 989 990 991 992 993 994 995
err_out:
	return rc;
}

/**
 * rio_mport_chk_dev_access - Validate access to the specified device.
 * @mport: Master port to send transactions
 * @destid: Device destination ID in network
 * @hopcount: Number of hops into the network
 */
996
int
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011
rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
{
	int i = 0;
	u32 tmp;

	while (rio_mport_read_config_32(mport, destid, hopcount,
					RIO_DEV_ID_CAR, &tmp)) {
		i++;
		if (i == RIO_MAX_CHK_RETRY)
			return -EIO;
		mdelay(1);
	}

	return 0;
}
1012
EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access);
1013 1014 1015 1016 1017 1018 1019

/**
 * rio_chk_dev_access - Validate access to the specified device.
 * @rdev: Pointer to RIO device control structure
 */
static int rio_chk_dev_access(struct rio_dev *rdev)
{
1020 1021
	return rio_mport_chk_dev_access(rdev->net->hport,
					rdev->destid, rdev->hopcount);
1022 1023
}

1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
/**
 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
 *                        returns link-response (if requested).
 * @rdev: RIO devive to issue Input-status command
 * @pnum: Device port number to issue the command
 * @lnkresp: Response from a link partner
 */
static int
rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
{
	u32 regval;
	int checkcount;

	if (lnkresp) {
		/* Read from link maintenance response register
		 * to clear valid bit */
1040
		rio_read_config_32(rdev,
1041
			RIO_DEV_PORT_N_MNT_RSP_CSR(rdev, pnum),
1042 1043 1044 1045 1046
			&regval);
		udelay(50);
	}

	/* Issue Input-status command */
1047
	rio_write_config_32(rdev,
1048
		RIO_DEV_PORT_N_MNT_REQ_CSR(rdev, pnum),
1049 1050 1051
		RIO_MNT_REQ_CMD_IS);

	/* Exit if the response is not expected */
1052
	if (!lnkresp)
1053 1054 1055 1056 1057
		return 0;

	checkcount = 3;
	while (checkcount--) {
		udelay(50);
1058
		rio_read_config_32(rdev,
1059
			RIO_DEV_PORT_N_MNT_RSP_CSR(rdev, pnum),
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
			&regval);
		if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
			*lnkresp = regval;
			return 0;
		}
	}

	return -EIO;
}

/**
 * rio_clr_err_stopped - Clears port Error-stopped states.
 * @rdev: Pointer to RIO device control structure
 * @pnum: Switch port number to clear errors
 * @err_status: port error status (if 0 reads register from device)
1075 1076 1077 1078 1079 1080 1081
 *
 * TODO: Currently this routine is not compatible with recovery process
 * specified for idt_gen3 RapidIO switch devices. It has to be reviewed
 * to implement universal recovery process that is compatible full range
 * off available devices.
 * IDT gen3 switch driver now implements HW-specific error handler that
 * issues soft port reset to the port to reset ERR_STOP bits and ackIDs.
1082 1083 1084 1085 1086 1087 1088 1089
 */
static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
{
	struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
	u32 regval;
	u32 far_ackid, far_linkstat, near_ackid;

	if (err_status == 0)
1090
		rio_read_config_32(rdev,
1091
			RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
1092 1093
			&err_status);

1094
	if (err_status & RIO_PORT_N_ERR_STS_OUT_ES) {
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
		pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
		/*
		 * Send a Link-Request/Input-Status control symbol
		 */
		if (rio_get_input_status(rdev, pnum, &regval)) {
			pr_debug("RIO_EM: Input-status response timeout\n");
			goto rd_err;
		}

		pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
			 pnum, regval);
		far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
		far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
1108
		rio_read_config_32(rdev,
1109
			RIO_DEV_PORT_N_ACK_STS_CSR(rdev, pnum),
1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
			&regval);
		pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
		near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
		pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
			 " near_ackID=0x%02x\n",
			pnum, far_ackid, far_linkstat, near_ackid);

		/*
		 * If required, synchronize ackIDs of near and
		 * far sides.
		 */
		if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
		    (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
			/* Align near outstanding/outbound ackIDs with
			 * far inbound.
			 */
1126
			rio_write_config_32(rdev,
1127
				RIO_DEV_PORT_N_ACK_STS_CSR(rdev, pnum),
1128 1129 1130 1131 1132 1133
				(near_ackid << 24) |
					(far_ackid << 8) | far_ackid);
			/* Align far outstanding/outbound ackIDs with
			 * near inbound.
			 */
			far_ackid++;
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143
			if (!nextdev) {
				pr_debug("RIO_EM: nextdev pointer == NULL\n");
				goto rd_err;
			}

			rio_write_config_32(nextdev,
				RIO_DEV_PORT_N_ACK_STS_CSR(nextdev,
					RIO_GET_PORT_NUM(nextdev->swpinfo)),
				(far_ackid << 24) |
				(near_ackid << 8) | near_ackid);
1144 1145
		}
rd_err:
1146 1147
		rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
				   &err_status);
1148 1149 1150
		pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
	}

1151
	if ((err_status & RIO_PORT_N_ERR_STS_INP_ES) && nextdev) {
1152 1153 1154 1155 1156
		pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
		rio_get_input_status(nextdev,
				     RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
		udelay(50);

1157 1158
		rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),
				   &err_status);
1159 1160 1161
		pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
	}

1162 1163
	return (err_status & (RIO_PORT_N_ERR_STS_OUT_ES |
			      RIO_PORT_N_ERR_STS_INP_ES)) ? 1 : 0;
1164 1165
}

1166
/**
1167 1168
 * rio_inb_pwrite_handler - inbound port-write message handler
 * @mport:  mport device associated with port-write
1169 1170 1171 1172 1173
 * @pw_msg: pointer to inbound port-write message
 *
 * Processes an inbound port-write message. Returns 0 if the request
 * has been satisfied.
 */
1174
int rio_inb_pwrite_handler(struct rio_mport *mport, union rio_pw_msg *pw_msg)
1175 1176
{
	struct rio_dev *rdev;
1177
	u32 err_status, em_perrdet, em_ltlerrdet;
1178
	int rc, portnum;
1179
	struct rio_pwrite *pwrite;
1180 1181 1182

#ifdef DEBUG_PW
	{
1183 1184 1185 1186
		u32 i;

		pr_debug("%s: PW to mport_%d:\n", __func__, mport->id);
		for (i = 0; i < RIO_PW_MSG_SIZE / sizeof(u32); i = i + 4) {
1187
			pr_debug("0x%02x: %08x %08x %08x %08x\n",
1188 1189 1190
				i * 4, pw_msg->raw[i], pw_msg->raw[i + 1],
				pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
		}
1191 1192 1193
	}
#endif

1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
	rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
	if (rdev) {
		pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
	} else {
		pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
			__func__, pw_msg->em.comptag);
	}

	/* Call a device-specific handler (if it is registered for the device).
	 * This may be the service for endpoints that send device-specific
	 * port-write messages. End-point messages expected to be handled
	 * completely by EP specific device driver.
1206 1207
	 * For switches rc==0 signals that no standard processing required.
	 */
1208
	if (rdev && rdev->pwcback) {
1209 1210 1211 1212 1213
		rc = rdev->pwcback(rdev, pw_msg, 0);
		if (rc == 0)
			return 0;
	}

1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226
	mutex_lock(&mport->lock);
	list_for_each_entry(pwrite, &mport->pwrites, node)
		pwrite->pwcback(mport, pwrite->context, pw_msg, 0);
	mutex_unlock(&mport->lock);

	if (!rdev)
		return 0;

	/*
	 * FIXME: The code below stays as it was before for now until we decide
	 * how to do default PW handling in combination with per-mport callbacks
	 */

1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246
	portnum = pw_msg->em.is_port & 0xFF;

	/* Check if device and route to it are functional:
	 * Sometimes devices may send PW message(s) just before being
	 * powered down (or link being lost).
	 */
	if (rio_chk_dev_access(rdev)) {
		pr_debug("RIO: device access failed - get link partner\n");
		/* Scan route to the device and identify failed link.
		 * This will replace device and port reported in PW message.
		 * PW message should not be used after this point.
		 */
		if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
			pr_err("RIO: Route trace for %s failed\n",
				rio_name(rdev));
			return -EIO;
		}
		pw_msg = NULL;
	}

1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
	/* For End-point devices processing stops here */
	if (!(rdev->pef & RIO_PEF_SWITCH))
		return 0;

	if (rdev->phys_efptr == 0) {
		pr_err("RIO_PW: Bad switch initialization for %s\n",
			rio_name(rdev));
		return 0;
	}

	/*
	 * Process the port-write notification from switch
	 */
1260 1261
	if (rdev->rswitch->ops && rdev->rswitch->ops->em_handle)
		rdev->rswitch->ops->em_handle(rdev, portnum);
1262

1263 1264
	rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, portnum),
			   &err_status);
1265 1266
	pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);

1267
	if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
1268

1269 1270 1271 1272 1273 1274 1275
		if (!(rdev->rswitch->port_ok & (1 << portnum))) {
			rdev->rswitch->port_ok |= (1 << portnum);
			rio_set_port_lockout(rdev, portnum, 0);
			/* Schedule Insertion Service */
			pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
			       rio_name(rdev), portnum);
		}
1276

1277 1278 1279 1280
		/* Clear error-stopped states (if reported).
		 * Depending on the link partner state, two attempts
		 * may be needed for successful recovery.
		 */
1281 1282
		if (err_status & (RIO_PORT_N_ERR_STS_OUT_ES |
				  RIO_PORT_N_ERR_STS_INP_ES)) {
1283 1284 1285 1286
			if (rio_clr_err_stopped(rdev, portnum, err_status))
				rio_clr_err_stopped(rdev, portnum, 0);
		}
	}  else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
1287

1288
		if (rdev->rswitch->port_ok & (1 << portnum)) {
1289 1290 1291
			rdev->rswitch->port_ok &= ~(1 << portnum);
			rio_set_port_lockout(rdev, portnum, 1);

1292
			if (rdev->phys_rmap == 1) {
1293
			rio_write_config_32(rdev,
1294
				RIO_DEV_PORT_N_ACK_STS_CSR(rdev, portnum),
1295
				RIO_PORT_N_ACK_CLEAR);
1296 1297 1298 1299 1300 1301 1302 1303
			} else {
				rio_write_config_32(rdev,
					RIO_DEV_PORT_N_OB_ACK_CSR(rdev, portnum),
					RIO_PORT_N_OB_ACK_CLEAR);
				rio_write_config_32(rdev,
					RIO_DEV_PORT_N_IB_ACK_CSR(rdev, portnum),
					0);
			}
1304 1305 1306 1307 1308

			/* Schedule Extraction Service */
			pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
			       rio_name(rdev), portnum);
		}
1309
	}
1310

1311
	rio_read_config_32(rdev,
1312 1313 1314 1315 1316
		rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
	if (em_perrdet) {
		pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
			 portnum, em_perrdet);
		/* Clear EM Port N Error Detect CSR */
1317
		rio_write_config_32(rdev,
1318 1319 1320
			rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
	}

1321
	rio_read_config_32(rdev,
1322 1323 1324 1325 1326
		rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
	if (em_ltlerrdet) {
		pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
			 em_ltlerrdet);
		/* Clear EM L/T Layer Error Detect CSR */
1327
		rio_write_config_32(rdev,
1328
			rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
1329 1330
	}

1331
	/* Clear remaining error bits and Port-Write Pending bit */
1332 1333
	rio_write_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, portnum),
			    err_status);
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370

	return 0;
}
EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);

/**
 * rio_mport_get_efb - get pointer to next extended features block
 * @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
 * @from: Offset of  current Extended Feature block header (if 0 starts
 * from	ExtFeaturePtr)
 */
u32
rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
		      u8 hopcount, u32 from)
{
	u32 reg_val;

	if (from == 0) {
		if (local)
			rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
						 &reg_val);
		else
			rio_mport_read_config_32(port, destid, hopcount,
						 RIO_ASM_INFO_CAR, &reg_val);
		return reg_val & RIO_EXT_FTR_PTR_MASK;
	} else {
		if (local)
			rio_local_read_config_32(port, from, &reg_val);
		else
			rio_mport_read_config_32(port, destid, hopcount,
						 from, &reg_val);
		return RIO_GET_BLOCK_ID(reg_val);
	}
}
1371
EXPORT_SYMBOL_GPL(rio_mport_get_efb);
1372

M
Matt Porter 已提交
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
/**
 * 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
1384
 * 0 in case the device does not support it.
M
Matt Porter 已提交
1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408
 */
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;
1409 1410 1411

		ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header);
		if (!ext_ftr_ptr)
M
Matt Porter 已提交
1412 1413 1414 1415 1416
			break;
	}

	return 0;
}
1417
EXPORT_SYMBOL_GPL(rio_mport_get_feature);
M
Matt Porter 已提交
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481

/**
 * 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);
}

1482 1483 1484 1485 1486 1487 1488 1489 1490 1491
/**
 * rio_std_route_add_entry - Add switch route table entry using standard
 *   registers defined in RIO specification rev.1.3
 * @mport: Master port to issue transaction
 * @destid: Destination ID of the device
 * @hopcount: Number of switch hops to the device
 * @table: routing table ID (global or port-specific)
 * @route_destid: destID entry in the RT
 * @route_port: destination port for specified destID
 */
1492 1493 1494
static int
rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
			u16 table, u16 route_destid, u8 route_port)
1495 1496 1497 1498 1499 1500 1501 1502 1503
{
	if (table == RIO_GLOBAL_TABLE) {
		rio_mport_write_config_32(mport, destid, hopcount,
				RIO_STD_RTE_CONF_DESTID_SEL_CSR,
				(u32)route_destid);
		rio_mport_write_config_32(mport, destid, hopcount,
				RIO_STD_RTE_CONF_PORT_SEL_CSR,
				(u32)route_port);
	}
1504

1505 1506 1507 1508 1509 1510
	udelay(10);
	return 0;
}

/**
 * rio_std_route_get_entry - Read switch route table entry (port number)
1511
 *   associated with specified destID using standard registers defined in RIO
1512 1513 1514 1515 1516 1517 1518 1519
 *   specification rev.1.3
 * @mport: Master port to issue transaction
 * @destid: Destination ID of the device
 * @hopcount: Number of switch hops to the device
 * @table: routing table ID (global or port-specific)
 * @route_destid: destID entry in the RT
 * @route_port: returned destination port for specified destID
 */
1520 1521 1522
static int
rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
			u16 table, u16 route_destid, u8 *route_port)
1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545
{
	u32 result;

	if (table == RIO_GLOBAL_TABLE) {
		rio_mport_write_config_32(mport, destid, hopcount,
				RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
		rio_mport_read_config_32(mport, destid, hopcount,
				RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);

		*route_port = (u8)result;
	}

	return 0;
}

/**
 * rio_std_route_clr_table - Clear swotch route table using standard registers
 *   defined in RIO specification rev.1.3.
 * @mport: Master port to issue transaction
 * @destid: Destination ID of the device
 * @hopcount: Number of switch hops to the device
 * @table: routing table ID (global or port-specific)
 */
1546 1547 1548
static int
rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
			u16 table)
1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588
{
	u32 max_destid = 0xff;
	u32 i, pef, id_inc = 1, ext_cfg = 0;
	u32 port_sel = RIO_INVALID_ROUTE;

	if (table == RIO_GLOBAL_TABLE) {
		rio_mport_read_config_32(mport, destid, hopcount,
					 RIO_PEF_CAR, &pef);

		if (mport->sys_size) {
			rio_mport_read_config_32(mport, destid, hopcount,
						 RIO_SWITCH_RT_LIMIT,
						 &max_destid);
			max_destid &= RIO_RT_MAX_DESTID;
		}

		if (pef & RIO_PEF_EXT_RT) {
			ext_cfg = 0x80000000;
			id_inc = 4;
			port_sel = (RIO_INVALID_ROUTE << 24) |
				   (RIO_INVALID_ROUTE << 16) |
				   (RIO_INVALID_ROUTE << 8) |
				   RIO_INVALID_ROUTE;
		}

		for (i = 0; i <= max_destid;) {
			rio_mport_write_config_32(mport, destid, hopcount,
					RIO_STD_RTE_CONF_DESTID_SEL_CSR,
					ext_cfg | i);
			rio_mport_write_config_32(mport, destid, hopcount,
					RIO_STD_RTE_CONF_PORT_SEL_CSR,
					port_sel);
			i += id_inc;
		}
	}

	udelay(10);
	return 0;
}

1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695
/**
 * rio_lock_device - Acquires host device lock for specified device
 * @port: Master port to send transaction
 * @destid: Destination ID for device/switch
 * @hopcount: Hopcount to reach switch
 * @wait_ms: Max wait time in msec (0 = no timeout)
 *
 * Attepts to acquire host device lock for specified device
 * Returns 0 if device lock acquired or EINVAL if timeout expires.
 */
int rio_lock_device(struct rio_mport *port, u16 destid,
		    u8 hopcount, int wait_ms)
{
	u32 result;
	int tcnt = 0;

	/* Attempt to acquire device lock */
	rio_mport_write_config_32(port, destid, hopcount,
				  RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
	rio_mport_read_config_32(port, destid, hopcount,
				 RIO_HOST_DID_LOCK_CSR, &result);

	while (result != port->host_deviceid) {
		if (wait_ms != 0 && tcnt == wait_ms) {
			pr_debug("RIO: timeout when locking device %x:%x\n",
				destid, hopcount);
			return -EINVAL;
		}

		/* Delay a bit */
		mdelay(1);
		tcnt++;
		/* Try to acquire device lock again */
		rio_mport_write_config_32(port, destid,
			hopcount,
			RIO_HOST_DID_LOCK_CSR,
			port->host_deviceid);
		rio_mport_read_config_32(port, destid,
			hopcount,
			RIO_HOST_DID_LOCK_CSR, &result);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(rio_lock_device);

/**
 * rio_unlock_device - Releases host device lock for specified device
 * @port: Master port to send transaction
 * @destid: Destination ID for device/switch
 * @hopcount: Hopcount to reach switch
 *
 * Returns 0 if device lock released or EINVAL if fails.
 */
int rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
{
	u32 result;

	/* Release device lock */
	rio_mport_write_config_32(port, destid,
				  hopcount,
				  RIO_HOST_DID_LOCK_CSR,
				  port->host_deviceid);
	rio_mport_read_config_32(port, destid, hopcount,
		RIO_HOST_DID_LOCK_CSR, &result);
	if ((result & 0xffff) != 0xffff) {
		pr_debug("RIO: badness when releasing device lock %x:%x\n",
			 destid, hopcount);
		return -EINVAL;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(rio_unlock_device);

/**
 * rio_route_add_entry- Add a route entry to a switch routing table
 * @rdev: RIO device
 * @table: Routing table ID
 * @route_destid: Destination ID to be routed
 * @route_port: Port number to be routed
 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
 *
 * If available calls the switch specific add_entry() method to add a route
 * entry into a switch routing table. Otherwise uses standard RT update method
 * as defined by RapidIO specification. A specific routing table can be selected
 * using the @table argument if a switch has per port routing tables or
 * the standard (or global) table may be used by passing
 * %RIO_GLOBAL_TABLE in @table.
 *
 * Returns %0 on success or %-EINVAL on failure.
 */
int rio_route_add_entry(struct rio_dev *rdev,
			u16 table, u16 route_destid, u8 route_port, int lock)
{
	int rc = -EINVAL;
	struct rio_switch_ops *ops = rdev->rswitch->ops;

	if (lock) {
		rc = rio_lock_device(rdev->net->hport, rdev->destid,
				     rdev->hopcount, 1000);
		if (rc)
			return rc;
	}

	spin_lock(&rdev->rswitch->lock);

1696
	if (!ops || !ops->add_entry) {
1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748
		rc = rio_std_route_add_entry(rdev->net->hport, rdev->destid,
					     rdev->hopcount, table,
					     route_destid, route_port);
	} else if (try_module_get(ops->owner)) {
		rc = ops->add_entry(rdev->net->hport, rdev->destid,
				    rdev->hopcount, table, route_destid,
				    route_port);
		module_put(ops->owner);
	}

	spin_unlock(&rdev->rswitch->lock);

	if (lock)
		rio_unlock_device(rdev->net->hport, rdev->destid,
				  rdev->hopcount);

	return rc;
}
EXPORT_SYMBOL_GPL(rio_route_add_entry);

/**
 * rio_route_get_entry- Read an entry from a switch routing table
 * @rdev: RIO device
 * @table: Routing table ID
 * @route_destid: Destination ID to be routed
 * @route_port: Pointer to read port number into
 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
 *
 * If available calls the switch specific get_entry() method to fetch a route
 * entry from a switch routing table. Otherwise uses standard RT read method
 * as defined by RapidIO specification. A specific routing table can be selected
 * using the @table argument if a switch has per port routing tables or
 * the standard (or global) table may be used by passing
 * %RIO_GLOBAL_TABLE in @table.
 *
 * Returns %0 on success or %-EINVAL on failure.
 */
int rio_route_get_entry(struct rio_dev *rdev, u16 table,
			u16 route_destid, u8 *route_port, int lock)
{
	int rc = -EINVAL;
	struct rio_switch_ops *ops = rdev->rswitch->ops;

	if (lock) {
		rc = rio_lock_device(rdev->net->hport, rdev->destid,
				     rdev->hopcount, 1000);
		if (rc)
			return rc;
	}

	spin_lock(&rdev->rswitch->lock);

1749
	if (!ops || !ops->get_entry) {
1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796
		rc = rio_std_route_get_entry(rdev->net->hport, rdev->destid,
					     rdev->hopcount, table,
					     route_destid, route_port);
	} else if (try_module_get(ops->owner)) {
		rc = ops->get_entry(rdev->net->hport, rdev->destid,
				    rdev->hopcount, table, route_destid,
				    route_port);
		module_put(ops->owner);
	}

	spin_unlock(&rdev->rswitch->lock);

	if (lock)
		rio_unlock_device(rdev->net->hport, rdev->destid,
				  rdev->hopcount);
	return rc;
}
EXPORT_SYMBOL_GPL(rio_route_get_entry);

/**
 * rio_route_clr_table - Clear a switch routing table
 * @rdev: RIO device
 * @table: Routing table ID
 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
 *
 * If available calls the switch specific clr_table() method to clear a switch
 * routing table. Otherwise uses standard RT write method as defined by RapidIO
 * specification. A specific routing table can be selected using the @table
 * argument if a switch has per port routing tables or the standard (or global)
 * table may be used by passing %RIO_GLOBAL_TABLE in @table.
 *
 * Returns %0 on success or %-EINVAL on failure.
 */
int rio_route_clr_table(struct rio_dev *rdev, u16 table, int lock)
{
	int rc = -EINVAL;
	struct rio_switch_ops *ops = rdev->rswitch->ops;

	if (lock) {
		rc = rio_lock_device(rdev->net->hport, rdev->destid,
				     rdev->hopcount, 1000);
		if (rc)
			return rc;
	}

	spin_lock(&rdev->rswitch->lock);

1797
	if (!ops || !ops->clr_table) {
1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816
		rc = rio_std_route_clr_table(rdev->net->hport, rdev->destid,
					     rdev->hopcount, table);
	} else if (try_module_get(ops->owner)) {
		rc = ops->clr_table(rdev->net->hport, rdev->destid,
				    rdev->hopcount, table);

		module_put(ops->owner);
	}

	spin_unlock(&rdev->rswitch->lock);

	if (lock)
		rio_unlock_device(rdev->net->hport, rdev->destid,
				  rdev->hopcount);

	return rc;
}
EXPORT_SYMBOL_GPL(rio_route_clr_table);

1817 1818 1819 1820
#ifdef CONFIG_RAPIDIO_DMA_ENGINE

static bool rio_chan_filter(struct dma_chan *chan, void *arg)
{
1821
	struct rio_mport *mport = arg;
1822 1823

	/* Check that DMA device belongs to the right MPORT */
1824
	return mport == container_of(chan->device, struct rio_mport, dma);
1825 1826 1827
}

/**
1828 1829 1830
 * rio_request_mport_dma - request RapidIO capable DMA channel associated
 *   with specified local RapidIO mport device.
 * @mport: RIO mport to perform DMA data transfers
1831 1832 1833
 *
 * Returns pointer to allocated DMA channel or NULL if failed.
 */
1834
struct dma_chan *rio_request_mport_dma(struct rio_mport *mport)
1835 1836 1837 1838 1839
{
	dma_cap_mask_t mask;

	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);
1840 1841 1842
	return dma_request_channel(mask, rio_chan_filter, mport);
}
EXPORT_SYMBOL_GPL(rio_request_mport_dma);
1843

1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
/**
 * rio_request_dma - request RapidIO capable DMA channel that supports
 *   specified target RapidIO device.
 * @rdev: RIO device associated with DMA transfer
 *
 * Returns pointer to allocated DMA channel or NULL if failed.
 */
struct dma_chan *rio_request_dma(struct rio_dev *rdev)
{
	return rio_request_mport_dma(rdev->net->hport);
1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
}
EXPORT_SYMBOL_GPL(rio_request_dma);

/**
 * rio_release_dma - release specified DMA channel
 * @dchan: DMA channel to release
 */
void rio_release_dma(struct dma_chan *dchan)
{
	dma_release_channel(dchan);
}
EXPORT_SYMBOL_GPL(rio_release_dma);

/**
1868
 * rio_dma_prep_xfer - RapidIO specific wrapper
1869 1870
 *   for device_prep_slave_sg callback defined by DMAENGINE.
 * @dchan: DMA channel to configure
1871
 * @destid: target RapidIO device destination ID
1872 1873 1874 1875 1876 1877 1878
 * @data: RIO specific data descriptor
 * @direction: DMA data transfer direction (TO or FROM the device)
 * @flags: dmaengine defined flags
 *
 * Initializes RapidIO capable DMA channel for the specified data transfer.
 * Uses DMA channel private extension to pass information related to remote
 * target RIO device.
1879 1880 1881
 *
 * Returns: pointer to DMA transaction descriptor if successful,
 *          error-valued pointer or NULL if failed.
1882
 */
1883 1884
struct dma_async_tx_descriptor *rio_dma_prep_xfer(struct dma_chan *dchan,
	u16 destid, struct rio_dma_data *data,
1885 1886 1887 1888
	enum dma_transfer_direction direction, unsigned long flags)
{
	struct rio_dma_ext rio_ext;

1889
	if (!dchan->device->device_prep_slave_sg) {
1890 1891 1892 1893
		pr_err("%s: prep_rio_sg == NULL\n", __func__);
		return NULL;
	}

1894
	rio_ext.destid = destid;
1895 1896 1897 1898
	rio_ext.rio_addr_u = data->rio_addr_u;
	rio_ext.rio_addr = data->rio_addr;
	rio_ext.wr_type = data->wr_type;

1899 1900 1901 1902
	return dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
				     direction, flags, &rio_ext);
}
EXPORT_SYMBOL_GPL(rio_dma_prep_xfer);
1903

1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915
/**
 * rio_dma_prep_slave_sg - RapidIO specific wrapper
 *   for device_prep_slave_sg callback defined by DMAENGINE.
 * @rdev: RIO device control structure
 * @dchan: DMA channel to configure
 * @data: RIO specific data descriptor
 * @direction: DMA data transfer direction (TO or FROM the device)
 * @flags: dmaengine defined flags
 *
 * Initializes RapidIO capable DMA channel for the specified data transfer.
 * Uses DMA channel private extension to pass information related to remote
 * target RIO device.
1916 1917 1918
 *
 * Returns: pointer to DMA transaction descriptor if successful,
 *          error-valued pointer or NULL if failed.
1919 1920 1921 1922 1923 1924
 */
struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
	struct dma_chan *dchan, struct rio_dma_data *data,
	enum dma_transfer_direction direction, unsigned long flags)
{
	return rio_dma_prep_xfer(dchan,	rdev->destid, data, direction, flags);
1925 1926 1927 1928 1929
}
EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);

#endif /* CONFIG_RAPIDIO_DMA_ENGINE */

1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953
/**
 * rio_find_mport - find RIO mport by its ID
 * @mport_id: number (ID) of mport device
 *
 * Given a RIO mport number, the desired mport is located
 * in the global list of mports. If the mport is found, a pointer to its
 * data structure is returned.  If no mport is found, %NULL is returned.
 */
struct rio_mport *rio_find_mport(int mport_id)
{
	struct rio_mport *port;

	mutex_lock(&rio_mport_list_lock);
	list_for_each_entry(port, &rio_mports, node) {
		if (port->id == mport_id)
			goto found;
	}
	port = NULL;
found:
	mutex_unlock(&rio_mport_list_lock);

	return port;
}

1954 1955 1956 1957
/**
 * rio_register_scan - enumeration/discovery method registration interface
 * @mport_id: mport device ID for which fabric scan routine has to be set
 *            (RIO_MPORT_ANY = set for all available mports)
1958 1959 1960 1961 1962
 * @scan_ops: enumeration/discovery operations structure
 *
 * Registers enumeration/discovery operations with RapidIO subsystem and
 * attaches it to the specified mport device (or all available mports
 * if RIO_MPORT_ANY is specified).
1963 1964
 *
 * Returns error if the mport already has an enumerator attached to it.
1965
 * In case of RIO_MPORT_ANY skips mports with valid scan routines (no error).
1966 1967 1968 1969
 */
int rio_register_scan(int mport_id, struct rio_scan *scan_ops)
{
	struct rio_mport *port;
1970 1971
	struct rio_scan_node *scan;
	int rc = 0;
1972

1973
	pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
1974

1975 1976 1977
	if ((mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS) ||
	    !scan_ops)
		return -EINVAL;
1978

1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
	mutex_lock(&rio_mport_list_lock);

	/*
	 * Check if there is another enumerator already registered for
	 * the same mport ID (including RIO_MPORT_ANY). Multiple enumerators
	 * for the same mport ID are not supported.
	 */
	list_for_each_entry(scan, &rio_scans, node) {
		if (scan->mport_id == mport_id) {
			rc = -EBUSY;
			goto err_out;
1990 1991
		}
	}
1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024

	/*
	 * Allocate and initialize new scan registration node.
	 */
	scan = kzalloc(sizeof(*scan), GFP_KERNEL);
	if (!scan) {
		rc = -ENOMEM;
		goto err_out;
	}

	scan->mport_id = mport_id;
	scan->ops = scan_ops;

	/*
	 * Traverse the list of registered mports to attach this new scan.
	 *
	 * The new scan with matching mport ID overrides any previously attached
	 * scan assuming that old scan (if any) is the default one (based on the
	 * enumerator registration check above).
	 * If the new scan is the global one, it will be attached only to mports
	 * that do not have their own individual operations already attached.
	 */
	list_for_each_entry(port, &rio_mports, node) {
		if (port->id == mport_id) {
			port->nscan = scan_ops;
			break;
		} else if (mport_id == RIO_MPORT_ANY && !port->nscan)
			port->nscan = scan_ops;
	}

	list_add_tail(&scan->node, &rio_scans);

err_out:
2025 2026 2027 2028 2029 2030 2031 2032 2033
	mutex_unlock(&rio_mport_list_lock);

	return rc;
}
EXPORT_SYMBOL_GPL(rio_register_scan);

/**
 * rio_unregister_scan - removes enumeration/discovery method from mport
 * @mport_id: mport device ID for which fabric scan routine has to be
2034 2035 2036
 *            unregistered (RIO_MPORT_ANY = apply to all mports that use
 *            the specified scan_ops)
 * @scan_ops: enumeration/discovery operations structure
2037 2038
 *
 * Removes enumeration or discovery method assigned to the specified mport
2039 2040
 * device. If RIO_MPORT_ANY is specified, removes the specified operations from
 * all mports that have them attached.
2041
 */
2042
int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops)
2043 2044
{
	struct rio_mport *port;
2045 2046 2047 2048 2049 2050
	struct rio_scan_node *scan;

	pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);

	if (mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS)
		return -EINVAL;
2051 2052

	mutex_lock(&rio_mport_list_lock);
2053 2054 2055 2056 2057 2058

	list_for_each_entry(port, &rio_mports, node)
		if (port->id == mport_id ||
		    (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops))
			port->nscan = NULL;

2059
	list_for_each_entry(scan, &rio_scans, node) {
2060 2061 2062
		if (scan->mport_id == mport_id) {
			list_del(&scan->node);
			kfree(scan);
2063
			break;
2064
		}
2065
	}
2066

2067 2068 2069 2070 2071 2072
	mutex_unlock(&rio_mport_list_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(rio_unregister_scan);

2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110
/**
 * rio_mport_scan - execute enumeration/discovery on the specified mport
 * @mport_id: number (ID) of mport device
 */
int rio_mport_scan(int mport_id)
{
	struct rio_mport *port = NULL;
	int rc;

	mutex_lock(&rio_mport_list_lock);
	list_for_each_entry(port, &rio_mports, node) {
		if (port->id == mport_id)
			goto found;
	}
	mutex_unlock(&rio_mport_list_lock);
	return -ENODEV;
found:
	if (!port->nscan) {
		mutex_unlock(&rio_mport_list_lock);
		return -EINVAL;
	}

	if (!try_module_get(port->nscan->owner)) {
		mutex_unlock(&rio_mport_list_lock);
		return -ENODEV;
	}

	mutex_unlock(&rio_mport_list_lock);

	if (port->host_deviceid >= 0)
		rc = port->nscan->enumerate(port, 0);
	else
		rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT);

	module_put(port->nscan->owner);
	return rc;
}

M
Matt Porter 已提交
2111 2112 2113 2114
static void rio_fixup_device(struct rio_dev *dev)
{
}

B
Bill Pemberton 已提交
2115
static int rio_init(void)
M
Matt Porter 已提交
2116 2117 2118 2119 2120 2121 2122 2123 2124
{
	struct rio_dev *dev = NULL;

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

2125 2126 2127 2128 2129 2130 2131
static struct workqueue_struct *rio_wq;

struct rio_disc_work {
	struct work_struct	work;
	struct rio_mport	*mport;
};

B
Bill Pemberton 已提交
2132
static void disc_work_handler(struct work_struct *_work)
2133 2134 2135 2136 2137 2138
{
	struct rio_disc_work *work;

	work = container_of(_work, struct rio_disc_work, work);
	pr_debug("RIO: discovery work for mport %d %s\n",
		 work->mport->id, work->mport->name);
2139 2140 2141 2142
	if (try_module_get(work->mport->nscan->owner)) {
		work->mport->nscan->discover(work->mport, 0);
		module_put(work->mport->nscan->owner);
	}
2143 2144
}

B
Bill Pemberton 已提交
2145
int rio_init_mports(void)
M
Matt Porter 已提交
2146 2147
{
	struct rio_mport *port;
2148
	struct rio_disc_work *work;
2149 2150 2151 2152
	int n = 0;

	if (!next_portid)
		return -ENODEV;
M
Matt Porter 已提交
2153

2154 2155 2156 2157
	/*
	 * First, run enumerations and check if we need to perform discovery
	 * on any of the registered mports.
	 */
2158
	mutex_lock(&rio_mport_list_lock);
M
Matt Porter 已提交
2159
	list_for_each_entry(port, &rio_mports, node) {
2160
		if (port->host_deviceid >= 0) {
2161
			if (port->nscan && try_module_get(port->nscan->owner)) {
2162
				port->nscan->enumerate(port, 0);
2163 2164
				module_put(port->nscan->owner);
			}
2165
		} else
2166 2167
			n++;
	}
2168
	mutex_unlock(&rio_mport_list_lock);
2169 2170 2171 2172 2173 2174 2175 2176 2177

	if (!n)
		goto no_disc;

	/*
	 * If we have mports that require discovery schedule a discovery work
	 * for each of them. If the code below fails to allocate needed
	 * resources, exit without error to keep results of enumeration
	 * process (if any).
2178
	 * TODO: Implement restart of discovery process for all or
2179 2180 2181 2182 2183 2184
	 * individual discovering mports.
	 */
	rio_wq = alloc_workqueue("riodisc", 0, 0);
	if (!rio_wq) {
		pr_err("RIO: unable allocate rio_wq\n");
		goto no_disc;
2185 2186
	}

2187 2188
	work = kcalloc(n, sizeof *work, GFP_KERNEL);
	if (!work) {
2189
		destroy_workqueue(rio_wq);
2190
		goto no_disc;
M
Matt Porter 已提交
2191 2192
	}

2193
	n = 0;
2194
	mutex_lock(&rio_mport_list_lock);
2195
	list_for_each_entry(port, &rio_mports, node) {
2196
		if (port->host_deviceid < 0 && port->nscan) {
2197 2198 2199 2200 2201 2202 2203 2204
			work[n].mport = port;
			INIT_WORK(&work[n].work, disc_work_handler);
			queue_work(rio_wq, &work[n].work);
			n++;
		}
	}

	flush_workqueue(rio_wq);
2205
	mutex_unlock(&rio_mport_list_lock);
2206 2207 2208 2209 2210
	pr_debug("RIO: destroy discovery workqueue\n");
	destroy_workqueue(rio_wq);
	kfree(work);

no_disc:
2211 2212
	rio_init();

2213
	return 0;
M
Matt Porter 已提交
2214 2215
}

2216 2217
static int rio_get_hdid(int index)
{
2218
	if (ids_num == 0 || ids_num <= index || index >= RIO_MAX_MPORTS)
2219 2220
		return -1;

2221
	return hdid[index];
2222 2223
}

2224
int rio_mport_initialize(struct rio_mport *mport)
M
Matt Porter 已提交
2225
{
2226 2227
	if (next_portid >= RIO_MAX_MPORTS) {
		pr_err("RIO: reached specified max number of mports\n");
2228
		return -ENODEV;
2229 2230
	}

2231 2232 2233 2234
	atomic_set(&mport->state, RIO_DEVICE_INITIALIZING);
	mport->id = next_portid++;
	mport->host_deviceid = rio_get_hdid(mport->id);
	mport->nscan = NULL;
2235
	mutex_init(&mport->lock);
2236
	mport->pwe_refcnt = 0;
2237
	INIT_LIST_HEAD(&mport->pwrites);
2238

2239 2240 2241
	return 0;
}
EXPORT_SYMBOL_GPL(rio_mport_initialize);
2242

2243 2244 2245 2246
int rio_register_mport(struct rio_mport *port)
{
	struct rio_scan_node *scan = NULL;
	int res = 0;
2247

2248
	mutex_lock(&rio_mport_list_lock);
2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261

	/*
	 * Check if there are any registered enumeration/discovery operations
	 * that have to be attached to the added mport.
	 */
	list_for_each_entry(scan, &rio_scans, node) {
		if (port->id == scan->mport_id ||
		    scan->mport_id == RIO_MPORT_ANY) {
			port->nscan = scan->ops;
			if (port->id == scan->mport_id)
				break;
		}
	}
2262 2263

	list_add_tail(&port->node, &rio_mports);
2264
	mutex_unlock(&rio_mport_list_lock);
2265

2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301
	dev_set_name(&port->dev, "rapidio%d", port->id);
	port->dev.class = &rio_mport_class;
	atomic_set(&port->state, RIO_DEVICE_RUNNING);

	res = device_register(&port->dev);
	if (res)
		dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",
			port->id, res);
	else
		dev_dbg(&port->dev, "RIO: registered mport%d\n", port->id);

	return res;
}
EXPORT_SYMBOL_GPL(rio_register_mport);

static int rio_mport_cleanup_callback(struct device *dev, void *data)
{
	struct rio_dev *rdev = to_rio_dev(dev);

	if (dev->bus == &rio_bus_type)
		rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
	return 0;
}

static int rio_net_remove_children(struct rio_net *net)
{
	/*
	 * Unregister all RapidIO devices residing on this net (this will
	 * invoke notification of registered subsystem interfaces as well).
	 */
	device_for_each_child(&net->dev, NULL, rio_mport_cleanup_callback);
	return 0;
}

int rio_unregister_mport(struct rio_mport *port)
{
2302
	pr_debug("RIO: %s %s id=%d\n", __func__, port->name, port->id);
2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325

	/* Transition mport to the SHUTDOWN state */
	if (atomic_cmpxchg(&port->state,
			   RIO_DEVICE_RUNNING,
			   RIO_DEVICE_SHUTDOWN) != RIO_DEVICE_RUNNING) {
		pr_err("RIO: %s unexpected state transition for mport %s\n",
			__func__, port->name);
	}

	if (port->net && port->net->hport == port) {
		rio_net_remove_children(port->net);
		rio_free_net(port->net);
	}

	/*
	 * Unregister all RapidIO devices attached to this mport (this will
	 * invoke notification of registered subsystem interfaces as well).
	 */
	mutex_lock(&rio_mport_list_lock);
	list_del(&port->node);
	mutex_unlock(&rio_mport_list_lock);
	device_unregister(&port->dev);

2326
	return 0;
M
Matt Porter 已提交
2327
}
2328
EXPORT_SYMBOL_GPL(rio_unregister_mport);
M
Matt Porter 已提交
2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340

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);
2341
EXPORT_SYMBOL_GPL(rio_init_mports);