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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>

 *

 * 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>

#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);