linux/drivers/rapidio/rio.c
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   1/*
   2 * RapidIO interconnect services
   3 * (RapidIO Interconnect Specification, http://www.rapidio.org)
   4 *
   5 * Copyright 2005 MontaVista Software, Inc.
   6 * Matt Porter <mporter@kernel.crashing.org>
   7 *
   8 * Copyright 2009 - 2013 Integrated Device Technology, Inc.
   9 * Alex Bounine <alexandre.bounine@idt.com>
  10 *
  11 * This program is free software; you can redistribute  it and/or modify it
  12 * under  the terms of  the GNU General  Public License as published by the
  13 * Free Software Foundation;  either version 2 of the  License, or (at your
  14 * option) any later version.
  15 */
  16
  17#include <linux/types.h>
  18#include <linux/kernel.h>
  19
  20#include <linux/delay.h>
  21#include <linux/init.h>
  22#include <linux/rio.h>
  23#include <linux/rio_drv.h>
  24#include <linux/rio_ids.h>
  25#include <linux/rio_regs.h>
  26#include <linux/module.h>
  27#include <linux/spinlock.h>
  28#include <linux/slab.h>
  29#include <linux/interrupt.h>
  30
  31#include "rio.h"
  32
  33MODULE_DESCRIPTION("RapidIO Subsystem Core");
  34MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>");
  35MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
  36MODULE_LICENSE("GPL");
  37
  38static int hdid[RIO_MAX_MPORTS];
  39static int ids_num;
  40module_param_array(hdid, int, &ids_num, 0);
  41MODULE_PARM_DESC(hdid,
  42        "Destination ID assignment to local RapidIO controllers");
  43
  44static LIST_HEAD(rio_devices);
  45static DEFINE_SPINLOCK(rio_global_list_lock);
  46
  47static LIST_HEAD(rio_mports);
  48static LIST_HEAD(rio_scans);
  49static DEFINE_MUTEX(rio_mport_list_lock);
  50static unsigned char next_portid;
  51static DEFINE_SPINLOCK(rio_mmap_lock);
  52
  53/**
  54 * rio_local_get_device_id - Get the base/extended device id for a port
  55 * @port: RIO master port from which to get the deviceid
  56 *
  57 * Reads the base/extended device id from the local device
  58 * implementing the master port. Returns the 8/16-bit device
  59 * id.
  60 */
  61u16 rio_local_get_device_id(struct rio_mport *port)
  62{
  63        u32 result;
  64
  65        rio_local_read_config_32(port, RIO_DID_CSR, &result);
  66
  67        return (RIO_GET_DID(port->sys_size, result));
  68}
  69
  70/**
  71 * rio_add_device- Adds a RIO device to the device model
  72 * @rdev: RIO device
  73 *
  74 * Adds the RIO device to the global device list and adds the RIO
  75 * device to the RIO device list.  Creates the generic sysfs nodes
  76 * for an RIO device.
  77 */
  78int rio_add_device(struct rio_dev *rdev)
  79{
  80        int err;
  81
  82        err = device_add(&rdev->dev);
  83        if (err)
  84                return err;
  85
  86        spin_lock(&rio_global_list_lock);
  87        list_add_tail(&rdev->global_list, &rio_devices);
  88        spin_unlock(&rio_global_list_lock);
  89
  90        rio_create_sysfs_dev_files(rdev);
  91
  92        return 0;
  93}
  94EXPORT_SYMBOL_GPL(rio_add_device);
  95
  96/**
  97 * rio_request_inb_mbox - request inbound mailbox service
  98 * @mport: RIO master port from which to allocate the mailbox resource
  99 * @dev_id: Device specific pointer to pass on event
 100 * @mbox: Mailbox number to claim
 101 * @entries: Number of entries in inbound mailbox queue
 102 * @minb: Callback to execute when inbound message is received
 103 *
 104 * Requests ownership of an inbound mailbox resource and binds
 105 * a callback function to the resource. Returns %0 on success.
 106 */
 107int rio_request_inb_mbox(struct rio_mport *mport,
 108                         void *dev_id,
 109                         int mbox,
 110                         int entries,
 111                         void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
 112                                       int slot))
 113{
 114        int rc = -ENOSYS;
 115        struct resource *res;
 116
 117        if (mport->ops->open_inb_mbox == NULL)
 118                goto out;
 119
 120        res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 121
 122        if (res) {
 123                rio_init_mbox_res(res, mbox, mbox);
 124
 125                /* Make sure this mailbox isn't in use */
 126                if ((rc =
 127                     request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
 128                                      res)) < 0) {
 129                        kfree(res);
 130                        goto out;
 131                }
 132
 133                mport->inb_msg[mbox].res = res;
 134
 135                /* Hook the inbound message callback */
 136                mport->inb_msg[mbox].mcback = minb;
 137
 138                rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
 139        } else
 140                rc = -ENOMEM;
 141
 142      out:
 143        return rc;
 144}
 145
 146/**
 147 * rio_release_inb_mbox - release inbound mailbox message service
 148 * @mport: RIO master port from which to release the mailbox resource
 149 * @mbox: Mailbox number to release
 150 *
 151 * Releases ownership of an inbound mailbox resource. Returns 0
 152 * if the request has been satisfied.
 153 */
 154int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
 155{
 156        if (mport->ops->close_inb_mbox) {
 157                mport->ops->close_inb_mbox(mport, mbox);
 158
 159                /* Release the mailbox resource */
 160                return release_resource(mport->inb_msg[mbox].res);
 161        } else
 162                return -ENOSYS;
 163}
 164
 165/**
 166 * rio_request_outb_mbox - request outbound mailbox service
 167 * @mport: RIO master port from which to allocate the mailbox resource
 168 * @dev_id: Device specific pointer to pass on event
 169 * @mbox: Mailbox number to claim
 170 * @entries: Number of entries in outbound mailbox queue
 171 * @moutb: Callback to execute when outbound message is sent
 172 *
 173 * Requests ownership of an outbound mailbox resource and binds
 174 * a callback function to the resource. Returns 0 on success.
 175 */
 176int rio_request_outb_mbox(struct rio_mport *mport,
 177                          void *dev_id,
 178                          int mbox,
 179                          int entries,
 180                          void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
 181{
 182        int rc = -ENOSYS;
 183        struct resource *res;
 184
 185        if (mport->ops->open_outb_mbox == NULL)
 186                goto out;
 187
 188        res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 189
 190        if (res) {
 191                rio_init_mbox_res(res, mbox, mbox);
 192
 193                /* Make sure this outbound mailbox isn't in use */
 194                if ((rc =
 195                     request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
 196                                      res)) < 0) {
 197                        kfree(res);
 198                        goto out;
 199                }
 200
 201                mport->outb_msg[mbox].res = res;
 202
 203                /* Hook the inbound message callback */
 204                mport->outb_msg[mbox].mcback = moutb;
 205
 206                rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
 207        } else
 208                rc = -ENOMEM;
 209
 210      out:
 211        return rc;
 212}
 213
 214/**
 215 * rio_release_outb_mbox - release outbound mailbox message service
 216 * @mport: RIO master port from which to release the mailbox resource
 217 * @mbox: Mailbox number to release
 218 *
 219 * Releases ownership of an inbound mailbox resource. Returns 0
 220 * if the request has been satisfied.
 221 */
 222int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
 223{
 224        if (mport->ops->close_outb_mbox) {
 225                mport->ops->close_outb_mbox(mport, mbox);
 226
 227                /* Release the mailbox resource */
 228                return release_resource(mport->outb_msg[mbox].res);
 229        } else
 230                return -ENOSYS;
 231}
 232
 233/**
 234 * rio_setup_inb_dbell - bind inbound doorbell callback
 235 * @mport: RIO master port to bind the doorbell callback
 236 * @dev_id: Device specific pointer to pass on event
 237 * @res: Doorbell message resource
 238 * @dinb: Callback to execute when doorbell is received
 239 *
 240 * Adds a doorbell resource/callback pair into a port's
 241 * doorbell event list. Returns 0 if the request has been
 242 * satisfied.
 243 */
 244static int
 245rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
 246                    void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
 247                                  u16 info))
 248{
 249        int rc = 0;
 250        struct rio_dbell *dbell;
 251
 252        if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
 253                rc = -ENOMEM;
 254                goto out;
 255        }
 256
 257        dbell->res = res;
 258        dbell->dinb = dinb;
 259        dbell->dev_id = dev_id;
 260
 261        list_add_tail(&dbell->node, &mport->dbells);
 262
 263      out:
 264        return rc;
 265}
 266
 267/**
 268 * rio_request_inb_dbell - request inbound doorbell message service
 269 * @mport: RIO master port from which to allocate the doorbell resource
 270 * @dev_id: Device specific pointer to pass on event
 271 * @start: Doorbell info range start
 272 * @end: Doorbell info range end
 273 * @dinb: Callback to execute when doorbell is received
 274 *
 275 * Requests ownership of an inbound doorbell resource and binds
 276 * a callback function to the resource. Returns 0 if the request
 277 * has been satisfied.
 278 */
 279int rio_request_inb_dbell(struct rio_mport *mport,
 280                          void *dev_id,
 281                          u16 start,
 282                          u16 end,
 283                          void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
 284                                        u16 dst, u16 info))
 285{
 286        int rc = 0;
 287
 288        struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 289
 290        if (res) {
 291                rio_init_dbell_res(res, start, end);
 292
 293                /* Make sure these doorbells aren't in use */
 294                if ((rc =
 295                     request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
 296                                      res)) < 0) {
 297                        kfree(res);
 298                        goto out;
 299                }
 300
 301                /* Hook the doorbell callback */
 302                rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
 303        } else
 304                rc = -ENOMEM;
 305
 306      out:
 307        return rc;
 308}
 309
 310/**
 311 * rio_release_inb_dbell - release inbound doorbell message service
 312 * @mport: RIO master port from which to release the doorbell resource
 313 * @start: Doorbell info range start
 314 * @end: Doorbell info range end
 315 *
 316 * Releases ownership of an inbound doorbell resource and removes
 317 * callback from the doorbell event list. Returns 0 if the request
 318 * has been satisfied.
 319 */
 320int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
 321{
 322        int rc = 0, found = 0;
 323        struct rio_dbell *dbell;
 324
 325        list_for_each_entry(dbell, &mport->dbells, node) {
 326                if ((dbell->res->start == start) && (dbell->res->end == end)) {
 327                        found = 1;
 328                        break;
 329                }
 330        }
 331
 332        /* If we can't find an exact match, fail */
 333        if (!found) {
 334                rc = -EINVAL;
 335                goto out;
 336        }
 337
 338        /* Delete from list */
 339        list_del(&dbell->node);
 340
 341        /* Release the doorbell resource */
 342        rc = release_resource(dbell->res);
 343
 344        /* Free the doorbell event */
 345        kfree(dbell);
 346
 347      out:
 348        return rc;
 349}
 350
 351/**
 352 * rio_request_outb_dbell - request outbound doorbell message range
 353 * @rdev: RIO device from which to allocate the doorbell resource
 354 * @start: Doorbell message range start
 355 * @end: Doorbell message range end
 356 *
 357 * Requests ownership of a doorbell message range. Returns a resource
 358 * if the request has been satisfied or %NULL on failure.
 359 */
 360struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
 361                                        u16 end)
 362{
 363        struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 364
 365        if (res) {
 366                rio_init_dbell_res(res, start, end);
 367
 368                /* Make sure these doorbells aren't in use */
 369                if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
 370                    < 0) {
 371                        kfree(res);
 372                        res = NULL;
 373                }
 374        }
 375
 376        return res;
 377}
 378
 379/**
 380 * rio_release_outb_dbell - release outbound doorbell message range
 381 * @rdev: RIO device from which to release the doorbell resource
 382 * @res: Doorbell resource to be freed
 383 *
 384 * Releases ownership of a doorbell message range. Returns 0 if the
 385 * request has been satisfied.
 386 */
 387int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
 388{
 389        int rc = release_resource(res);
 390
 391        kfree(res);
 392
 393        return rc;
 394}
 395
 396/**
 397 * rio_request_inb_pwrite - request inbound port-write message service
 398 * @rdev: RIO device to which register inbound port-write callback routine
 399 * @pwcback: Callback routine to execute when port-write is received
 400 *
 401 * Binds a port-write callback function to the RapidIO device.
 402 * Returns 0 if the request has been satisfied.
 403 */
 404int rio_request_inb_pwrite(struct rio_dev *rdev,
 405        int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
 406{
 407        int rc = 0;
 408
 409        spin_lock(&rio_global_list_lock);
 410        if (rdev->pwcback != NULL)
 411                rc = -ENOMEM;
 412        else
 413                rdev->pwcback = pwcback;
 414
 415        spin_unlock(&rio_global_list_lock);
 416        return rc;
 417}
 418EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);
 419
 420/**
 421 * rio_release_inb_pwrite - release inbound port-write message service
 422 * @rdev: RIO device which registered for inbound port-write callback
 423 *
 424 * Removes callback from the rio_dev structure. Returns 0 if the request
 425 * has been satisfied.
 426 */
 427int rio_release_inb_pwrite(struct rio_dev *rdev)
 428{
 429        int rc = -ENOMEM;
 430
 431        spin_lock(&rio_global_list_lock);
 432        if (rdev->pwcback) {
 433                rdev->pwcback = NULL;
 434                rc = 0;
 435        }
 436
 437        spin_unlock(&rio_global_list_lock);
 438        return rc;
 439}
 440EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
 441
 442/**
 443 * rio_map_inb_region -- Map inbound memory region.
 444 * @mport: Master port.
 445 * @local: physical address of memory region to be mapped
 446 * @rbase: RIO base address assigned to this window
 447 * @size: Size of the memory region
 448 * @rflags: Flags for mapping.
 449 *
 450 * Return: 0 -- Success.
 451 *
 452 * This function will create the mapping from RIO space to local memory.
 453 */
 454int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
 455                        u64 rbase, u32 size, u32 rflags)
 456{
 457        int rc = 0;
 458        unsigned long flags;
 459
 460        if (!mport->ops->map_inb)
 461                return -1;
 462        spin_lock_irqsave(&rio_mmap_lock, flags);
 463        rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
 464        spin_unlock_irqrestore(&rio_mmap_lock, flags);
 465        return rc;
 466}
 467EXPORT_SYMBOL_GPL(rio_map_inb_region);
 468
 469/**
 470 * rio_unmap_inb_region -- Unmap the inbound memory region
 471 * @mport: Master port
 472 * @lstart: physical address of memory region to be unmapped
 473 */
 474void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
 475{
 476        unsigned long flags;
 477        if (!mport->ops->unmap_inb)
 478                return;
 479        spin_lock_irqsave(&rio_mmap_lock, flags);
 480        mport->ops->unmap_inb(mport, lstart);
 481        spin_unlock_irqrestore(&rio_mmap_lock, flags);
 482}
 483EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
 484
 485/**
 486 * rio_mport_get_physefb - Helper function that returns register offset
 487 *                      for Physical Layer Extended Features Block.
 488 * @port: Master port to issue transaction
 489 * @local: Indicate a local master port or remote device access
 490 * @destid: Destination ID of the device
 491 * @hopcount: Number of switch hops to the device
 492 */
 493u32
 494rio_mport_get_physefb(struct rio_mport *port, int local,
 495                      u16 destid, u8 hopcount)
 496{
 497        u32 ext_ftr_ptr;
 498        u32 ftr_header;
 499
 500        ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);
 501
 502        while (ext_ftr_ptr)  {
 503                if (local)
 504                        rio_local_read_config_32(port, ext_ftr_ptr,
 505                                                 &ftr_header);
 506                else
 507                        rio_mport_read_config_32(port, destid, hopcount,
 508                                                 ext_ftr_ptr, &ftr_header);
 509
 510                ftr_header = RIO_GET_BLOCK_ID(ftr_header);
 511                switch (ftr_header) {
 512
 513                case RIO_EFB_SER_EP_ID_V13P:
 514                case RIO_EFB_SER_EP_REC_ID_V13P:
 515                case RIO_EFB_SER_EP_FREE_ID_V13P:
 516                case RIO_EFB_SER_EP_ID:
 517                case RIO_EFB_SER_EP_REC_ID:
 518                case RIO_EFB_SER_EP_FREE_ID:
 519                case RIO_EFB_SER_EP_FREC_ID:
 520
 521                        return ext_ftr_ptr;
 522
 523                default:
 524                        break;
 525                }
 526
 527                ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
 528                                                hopcount, ext_ftr_ptr);
 529        }
 530
 531        return ext_ftr_ptr;
 532}
 533EXPORT_SYMBOL_GPL(rio_mport_get_physefb);
 534
 535/**
 536 * rio_get_comptag - Begin or continue searching for a RIO device by component tag
 537 * @comp_tag: RIO component tag to match
 538 * @from: Previous RIO device found in search, or %NULL for new search
 539 *
 540 * Iterates through the list of known RIO devices. If a RIO device is
 541 * found with a matching @comp_tag, a pointer to its device
 542 * structure is returned. Otherwise, %NULL is returned. A new search
 543 * is initiated by passing %NULL to the @from argument. Otherwise, if
 544 * @from is not %NULL, searches continue from next device on the global
 545 * list.
 546 */
 547struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
 548{
 549        struct list_head *n;
 550        struct rio_dev *rdev;
 551
 552        spin_lock(&rio_global_list_lock);
 553        n = from ? from->global_list.next : rio_devices.next;
 554
 555        while (n && (n != &rio_devices)) {
 556                rdev = rio_dev_g(n);
 557                if (rdev->comp_tag == comp_tag)
 558                        goto exit;
 559                n = n->next;
 560        }
 561        rdev = NULL;
 562exit:
 563        spin_unlock(&rio_global_list_lock);
 564        return rdev;
 565}
 566EXPORT_SYMBOL_GPL(rio_get_comptag);
 567
 568/**
 569 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
 570 * @rdev: Pointer to RIO device control structure
 571 * @pnum: Switch port number to set LOCKOUT bit
 572 * @lock: Operation : set (=1) or clear (=0)
 573 */
 574int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
 575{
 576        u32 regval;
 577
 578        rio_read_config_32(rdev,
 579                                 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
 580                                 &regval);
 581        if (lock)
 582                regval |= RIO_PORT_N_CTL_LOCKOUT;
 583        else
 584                regval &= ~RIO_PORT_N_CTL_LOCKOUT;
 585
 586        rio_write_config_32(rdev,
 587                                  rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
 588                                  regval);
 589        return 0;
 590}
 591EXPORT_SYMBOL_GPL(rio_set_port_lockout);
 592
 593/**
 594 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
 595 * given port
 596 * @port: Master port associated with the RIO network
 597 * @local: local=1 select local port otherwise a far device is reached
 598 * @destid: Destination ID of the device to check host bit
 599 * @hopcount: Number of hops to reach the target
 600 * @port_num: Port (-number on switch) to enable on a far end device
 601 *
 602 * Returns 0 or 1 from on General Control Command and Status Register
 603 * (EXT_PTR+0x3C)
 604 */
 605int rio_enable_rx_tx_port(struct rio_mport *port,
 606                          int local, u16 destid,
 607                          u8 hopcount, u8 port_num)
 608{
 609#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
 610        u32 regval;
 611        u32 ext_ftr_ptr;
 612
 613        /*
 614        * enable rx input tx output port
 615        */
 616        pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
 617                 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
 618
 619        ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
 620
 621        if (local) {
 622                rio_local_read_config_32(port, ext_ftr_ptr +
 623                                RIO_PORT_N_CTL_CSR(0),
 624                                &regval);
 625        } else {
 626                if (rio_mport_read_config_32(port, destid, hopcount,
 627                ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 0)
 628                        return -EIO;
 629        }
 630
 631        if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
 632                /* serial */
 633                regval = regval | RIO_PORT_N_CTL_EN_RX_SER
 634                                | RIO_PORT_N_CTL_EN_TX_SER;
 635        } else {
 636                /* parallel */
 637                regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
 638                                | RIO_PORT_N_CTL_EN_TX_PAR;
 639        }
 640
 641        if (local) {
 642                rio_local_write_config_32(port, ext_ftr_ptr +
 643                                          RIO_PORT_N_CTL_CSR(0), regval);
 644        } else {
 645                if (rio_mport_write_config_32(port, destid, hopcount,
 646                    ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
 647                        return -EIO;
 648        }
 649#endif
 650        return 0;
 651}
 652EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port);
 653
 654
 655/**
 656 * rio_chk_dev_route - Validate route to the specified device.
 657 * @rdev:  RIO device failed to respond
 658 * @nrdev: Last active device on the route to rdev
 659 * @npnum: nrdev's port number on the route to rdev
 660 *
 661 * Follows a route to the specified RIO device to determine the last available
 662 * device (and corresponding RIO port) on the route.
 663 */
 664static int
 665rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
 666{
 667        u32 result;
 668        int p_port, rc = -EIO;
 669        struct rio_dev *prev = NULL;
 670
 671        /* Find switch with failed RIO link */
 672        while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
 673                if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
 674                        prev = rdev->prev;
 675                        break;
 676                }
 677                rdev = rdev->prev;
 678        }
 679
 680        if (prev == NULL)
 681                goto err_out;
 682
 683        p_port = prev->rswitch->route_table[rdev->destid];
 684
 685        if (p_port != RIO_INVALID_ROUTE) {
 686                pr_debug("RIO: link failed on [%s]-P%d\n",
 687                         rio_name(prev), p_port);
 688                *nrdev = prev;
 689                *npnum = p_port;
 690                rc = 0;
 691        } else
 692                pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
 693err_out:
 694        return rc;
 695}
 696
 697/**
 698 * rio_mport_chk_dev_access - Validate access to the specified device.
 699 * @mport: Master port to send transactions
 700 * @destid: Device destination ID in network
 701 * @hopcount: Number of hops into the network
 702 */
 703int
 704rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
 705{
 706        int i = 0;
 707        u32 tmp;
 708
 709        while (rio_mport_read_config_32(mport, destid, hopcount,
 710                                        RIO_DEV_ID_CAR, &tmp)) {
 711                i++;
 712                if (i == RIO_MAX_CHK_RETRY)
 713                        return -EIO;
 714                mdelay(1);
 715        }
 716
 717        return 0;
 718}
 719EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access);
 720
 721/**
 722 * rio_chk_dev_access - Validate access to the specified device.
 723 * @rdev: Pointer to RIO device control structure
 724 */
 725static int rio_chk_dev_access(struct rio_dev *rdev)
 726{
 727        return rio_mport_chk_dev_access(rdev->net->hport,
 728                                        rdev->destid, rdev->hopcount);
 729}
 730
 731/**
 732 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
 733 *                        returns link-response (if requested).
 734 * @rdev: RIO devive to issue Input-status command
 735 * @pnum: Device port number to issue the command
 736 * @lnkresp: Response from a link partner
 737 */
 738static int
 739rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
 740{
 741        u32 regval;
 742        int checkcount;
 743
 744        if (lnkresp) {
 745                /* Read from link maintenance response register
 746                 * to clear valid bit */
 747                rio_read_config_32(rdev,
 748                        rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
 749                        &regval);
 750                udelay(50);
 751        }
 752
 753        /* Issue Input-status command */
 754        rio_write_config_32(rdev,
 755                rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum),
 756                RIO_MNT_REQ_CMD_IS);
 757
 758        /* Exit if the response is not expected */
 759        if (lnkresp == NULL)
 760                return 0;
 761
 762        checkcount = 3;
 763        while (checkcount--) {
 764                udelay(50);
 765                rio_read_config_32(rdev,
 766                        rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
 767                        &regval);
 768                if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
 769                        *lnkresp = regval;
 770                        return 0;
 771                }
 772        }
 773
 774        return -EIO;
 775}
 776
 777/**
 778 * rio_clr_err_stopped - Clears port Error-stopped states.
 779 * @rdev: Pointer to RIO device control structure
 780 * @pnum: Switch port number to clear errors
 781 * @err_status: port error status (if 0 reads register from device)
 782 */
 783static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
 784{
 785        struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
 786        u32 regval;
 787        u32 far_ackid, far_linkstat, near_ackid;
 788
 789        if (err_status == 0)
 790                rio_read_config_32(rdev,
 791                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
 792                        &err_status);
 793
 794        if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) {
 795                pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
 796                /*
 797                 * Send a Link-Request/Input-Status control symbol
 798                 */
 799                if (rio_get_input_status(rdev, pnum, &regval)) {
 800                        pr_debug("RIO_EM: Input-status response timeout\n");
 801                        goto rd_err;
 802                }
 803
 804                pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
 805                         pnum, regval);
 806                far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
 807                far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
 808                rio_read_config_32(rdev,
 809                        rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
 810                        &regval);
 811                pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
 812                near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
 813                pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
 814                         " near_ackID=0x%02x\n",
 815                        pnum, far_ackid, far_linkstat, near_ackid);
 816
 817                /*
 818                 * If required, synchronize ackIDs of near and
 819                 * far sides.
 820                 */
 821                if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
 822                    (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
 823                        /* Align near outstanding/outbound ackIDs with
 824                         * far inbound.
 825                         */
 826                        rio_write_config_32(rdev,
 827                                rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
 828                                (near_ackid << 24) |
 829                                        (far_ackid << 8) | far_ackid);
 830                        /* Align far outstanding/outbound ackIDs with
 831                         * near inbound.
 832                         */
 833                        far_ackid++;
 834                        if (nextdev)
 835                                rio_write_config_32(nextdev,
 836                                        nextdev->phys_efptr +
 837                                        RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)),
 838                                        (far_ackid << 24) |
 839                                        (near_ackid << 8) | near_ackid);
 840                        else
 841                                pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n");
 842                }
 843rd_err:
 844                rio_read_config_32(rdev,
 845                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
 846                        &err_status);
 847                pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
 848        }
 849
 850        if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) {
 851                pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
 852                rio_get_input_status(nextdev,
 853                                     RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
 854                udelay(50);
 855
 856                rio_read_config_32(rdev,
 857                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
 858                        &err_status);
 859                pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
 860        }
 861
 862        return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
 863                              RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0;
 864}
 865
 866/**
 867 * rio_inb_pwrite_handler - process inbound port-write message
 868 * @pw_msg: pointer to inbound port-write message
 869 *
 870 * Processes an inbound port-write message. Returns 0 if the request
 871 * has been satisfied.
 872 */
 873int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg)
 874{
 875        struct rio_dev *rdev;
 876        u32 err_status, em_perrdet, em_ltlerrdet;
 877        int rc, portnum;
 878
 879        rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
 880        if (rdev == NULL) {
 881                /* Device removed or enumeration error */
 882                pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
 883                        __func__, pw_msg->em.comptag);
 884                return -EIO;
 885        }
 886
 887        pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
 888
 889#ifdef DEBUG_PW
 890        {
 891        u32 i;
 892        for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32);) {
 893                        pr_debug("0x%02x: %08x %08x %08x %08x\n",
 894                                 i*4, pw_msg->raw[i], pw_msg->raw[i + 1],
 895                                 pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
 896                        i += 4;
 897        }
 898        }
 899#endif
 900
 901        /* Call an external service function (if such is registered
 902         * for this device). This may be the service for endpoints that send
 903         * device-specific port-write messages. End-point messages expected
 904         * to be handled completely by EP specific device driver.
 905         * For switches rc==0 signals that no standard processing required.
 906         */
 907        if (rdev->pwcback != NULL) {
 908                rc = rdev->pwcback(rdev, pw_msg, 0);
 909                if (rc == 0)
 910                        return 0;
 911        }
 912
 913        portnum = pw_msg->em.is_port & 0xFF;
 914
 915        /* Check if device and route to it are functional:
 916         * Sometimes devices may send PW message(s) just before being
 917         * powered down (or link being lost).
 918         */
 919        if (rio_chk_dev_access(rdev)) {
 920                pr_debug("RIO: device access failed - get link partner\n");
 921                /* Scan route to the device and identify failed link.
 922                 * This will replace device and port reported in PW message.
 923                 * PW message should not be used after this point.
 924                 */
 925                if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
 926                        pr_err("RIO: Route trace for %s failed\n",
 927                                rio_name(rdev));
 928                        return -EIO;
 929                }
 930                pw_msg = NULL;
 931        }
 932
 933        /* For End-point devices processing stops here */
 934        if (!(rdev->pef & RIO_PEF_SWITCH))
 935                return 0;
 936
 937        if (rdev->phys_efptr == 0) {
 938                pr_err("RIO_PW: Bad switch initialization for %s\n",
 939                        rio_name(rdev));
 940                return 0;
 941        }
 942
 943        /*
 944         * Process the port-write notification from switch
 945         */
 946        if (rdev->rswitch->ops && rdev->rswitch->ops->em_handle)
 947                rdev->rswitch->ops->em_handle(rdev, portnum);
 948
 949        rio_read_config_32(rdev,
 950                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
 951                        &err_status);
 952        pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);
 953
 954        if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
 955
 956                if (!(rdev->rswitch->port_ok & (1 << portnum))) {
 957                        rdev->rswitch->port_ok |= (1 << portnum);
 958                        rio_set_port_lockout(rdev, portnum, 0);
 959                        /* Schedule Insertion Service */
 960                        pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
 961                               rio_name(rdev), portnum);
 962                }
 963
 964                /* Clear error-stopped states (if reported).
 965                 * Depending on the link partner state, two attempts
 966                 * may be needed for successful recovery.
 967                 */
 968                if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
 969                                  RIO_PORT_N_ERR_STS_PW_INP_ES)) {
 970                        if (rio_clr_err_stopped(rdev, portnum, err_status))
 971                                rio_clr_err_stopped(rdev, portnum, 0);
 972                }
 973        }  else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
 974
 975                if (rdev->rswitch->port_ok & (1 << portnum)) {
 976                        rdev->rswitch->port_ok &= ~(1 << portnum);
 977                        rio_set_port_lockout(rdev, portnum, 1);
 978
 979                        rio_write_config_32(rdev,
 980                                rdev->phys_efptr +
 981                                        RIO_PORT_N_ACK_STS_CSR(portnum),
 982                                RIO_PORT_N_ACK_CLEAR);
 983
 984                        /* Schedule Extraction Service */
 985                        pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
 986                               rio_name(rdev), portnum);
 987                }
 988        }
 989
 990        rio_read_config_32(rdev,
 991                rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
 992        if (em_perrdet) {
 993                pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
 994                         portnum, em_perrdet);
 995                /* Clear EM Port N Error Detect CSR */
 996                rio_write_config_32(rdev,
 997                        rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
 998        }
 999
1000        rio_read_config_32(rdev,
1001                rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
1002        if (em_ltlerrdet) {
1003                pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
1004                         em_ltlerrdet);
1005                /* Clear EM L/T Layer Error Detect CSR */
1006                rio_write_config_32(rdev,
1007                        rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
1008        }
1009
1010        /* Clear remaining error bits and Port-Write Pending bit */
1011        rio_write_config_32(rdev,
1012                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
1013                        err_status);
1014
1015        return 0;
1016}
1017EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);
1018
1019/**
1020 * rio_mport_get_efb - get pointer to next extended features block
1021 * @port: Master port to issue transaction
1022 * @local: Indicate a local master port or remote device access
1023 * @destid: Destination ID of the device
1024 * @hopcount: Number of switch hops to the device
1025 * @from: Offset of  current Extended Feature block header (if 0 starts
1026 * from ExtFeaturePtr)
1027 */
1028u32
1029rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
1030                      u8 hopcount, u32 from)
1031{
1032        u32 reg_val;
1033
1034        if (from == 0) {
1035                if (local)
1036                        rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
1037                                                 &reg_val);
1038                else
1039                        rio_mport_read_config_32(port, destid, hopcount,
1040                                                 RIO_ASM_INFO_CAR, &reg_val);
1041                return reg_val & RIO_EXT_FTR_PTR_MASK;
1042        } else {
1043                if (local)
1044                        rio_local_read_config_32(port, from, &reg_val);
1045                else
1046                        rio_mport_read_config_32(port, destid, hopcount,
1047                                                 from, &reg_val);
1048                return RIO_GET_BLOCK_ID(reg_val);
1049        }
1050}
1051EXPORT_SYMBOL_GPL(rio_mport_get_efb);
1052
1053/**
1054 * rio_mport_get_feature - query for devices' extended features
1055 * @port: Master port to issue transaction
1056 * @local: Indicate a local master port or remote device access
1057 * @destid: Destination ID of the device
1058 * @hopcount: Number of switch hops to the device
1059 * @ftr: Extended feature code
1060 *
1061 * Tell if a device supports a given RapidIO capability.
1062 * Returns the offset of the requested extended feature
1063 * block within the device's RIO configuration space or
1064 * 0 in case the device does not support it.  Possible
1065 * values for @ftr:
1066 *
1067 * %RIO_EFB_PAR_EP_ID           LP/LVDS EP Devices
1068 *
1069 * %RIO_EFB_PAR_EP_REC_ID       LP/LVDS EP Recovery Devices
1070 *
1071 * %RIO_EFB_PAR_EP_FREE_ID      LP/LVDS EP Free Devices
1072 *
1073 * %RIO_EFB_SER_EP_ID           LP/Serial EP Devices
1074 *
1075 * %RIO_EFB_SER_EP_REC_ID       LP/Serial EP Recovery Devices
1076 *
1077 * %RIO_EFB_SER_EP_FREE_ID      LP/Serial EP Free Devices
1078 */
1079u32
1080rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
1081                      u8 hopcount, int ftr)
1082{
1083        u32 asm_info, ext_ftr_ptr, ftr_header;
1084
1085        if (local)
1086                rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
1087        else
1088                rio_mport_read_config_32(port, destid, hopcount,
1089                                         RIO_ASM_INFO_CAR, &asm_info);
1090
1091        ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
1092
1093        while (ext_ftr_ptr) {
1094                if (local)
1095                        rio_local_read_config_32(port, ext_ftr_ptr,
1096                                                 &ftr_header);
1097                else
1098                        rio_mport_read_config_32(port, destid, hopcount,
1099                                                 ext_ftr_ptr, &ftr_header);
1100                if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
1101                        return ext_ftr_ptr;
1102                if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
1103                        break;
1104        }
1105
1106        return 0;
1107}
1108EXPORT_SYMBOL_GPL(rio_mport_get_feature);
1109
1110/**
1111 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
1112 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1113 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1114 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
1115 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
1116 * @from: Previous RIO device found in search, or %NULL for new search
1117 *
1118 * Iterates through the list of known RIO devices. If a RIO device is
1119 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
1120 * count to the device is incrememted and a pointer to its device
1121 * structure is returned. Otherwise, %NULL is returned. A new search
1122 * is initiated by passing %NULL to the @from argument. Otherwise, if
1123 * @from is not %NULL, searches continue from next device on the global
1124 * list. The reference count for @from is always decremented if it is
1125 * not %NULL.
1126 */
1127struct rio_dev *rio_get_asm(u16 vid, u16 did,
1128                            u16 asm_vid, u16 asm_did, struct rio_dev *from)
1129{
1130        struct list_head *n;
1131        struct rio_dev *rdev;
1132
1133        WARN_ON(in_interrupt());
1134        spin_lock(&rio_global_list_lock);
1135        n = from ? from->global_list.next : rio_devices.next;
1136
1137        while (n && (n != &rio_devices)) {
1138                rdev = rio_dev_g(n);
1139                if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
1140                    (did == RIO_ANY_ID || rdev->did == did) &&
1141                    (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
1142                    (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
1143                        goto exit;
1144                n = n->next;
1145        }
1146        rdev = NULL;
1147      exit:
1148        rio_dev_put(from);
1149        rdev = rio_dev_get(rdev);
1150        spin_unlock(&rio_global_list_lock);
1151        return rdev;
1152}
1153
1154/**
1155 * rio_get_device - Begin or continue searching for a RIO device by vid/did
1156 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1157 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1158 * @from: Previous RIO device found in search, or %NULL for new search
1159 *
1160 * Iterates through the list of known RIO devices. If a RIO device is
1161 * found with a matching @vid and @did, the reference count to the
1162 * device is incrememted and a pointer to its device structure is returned.
1163 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
1164 * to the @from argument. Otherwise, if @from is not %NULL, searches
1165 * continue from next device on the global list. The reference count for
1166 * @from is always decremented if it is not %NULL.
1167 */
1168struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
1169{
1170        return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
1171}
1172
1173/**
1174 * rio_std_route_add_entry - Add switch route table entry using standard
1175 *   registers defined in RIO specification rev.1.3
1176 * @mport: Master port to issue transaction
1177 * @destid: Destination ID of the device
1178 * @hopcount: Number of switch hops to the device
1179 * @table: routing table ID (global or port-specific)
1180 * @route_destid: destID entry in the RT
1181 * @route_port: destination port for specified destID
1182 */
1183static int
1184rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1185                        u16 table, u16 route_destid, u8 route_port)
1186{
1187        if (table == RIO_GLOBAL_TABLE) {
1188                rio_mport_write_config_32(mport, destid, hopcount,
1189                                RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1190                                (u32)route_destid);
1191                rio_mport_write_config_32(mport, destid, hopcount,
1192                                RIO_STD_RTE_CONF_PORT_SEL_CSR,
1193                                (u32)route_port);
1194        }
1195
1196        udelay(10);
1197        return 0;
1198}
1199
1200/**
1201 * rio_std_route_get_entry - Read switch route table entry (port number)
1202 *   associated with specified destID using standard registers defined in RIO
1203 *   specification rev.1.3
1204 * @mport: Master port to issue transaction
1205 * @destid: Destination ID of the device
1206 * @hopcount: Number of switch hops to the device
1207 * @table: routing table ID (global or port-specific)
1208 * @route_destid: destID entry in the RT
1209 * @route_port: returned destination port for specified destID
1210 */
1211static int
1212rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1213                        u16 table, u16 route_destid, u8 *route_port)
1214{
1215        u32 result;
1216
1217        if (table == RIO_GLOBAL_TABLE) {
1218                rio_mport_write_config_32(mport, destid, hopcount,
1219                                RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
1220                rio_mport_read_config_32(mport, destid, hopcount,
1221                                RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);
1222
1223                *route_port = (u8)result;
1224        }
1225
1226        return 0;
1227}
1228
1229/**
1230 * rio_std_route_clr_table - Clear swotch route table using standard registers
1231 *   defined in RIO specification rev.1.3.
1232 * @mport: Master port to issue transaction
1233 * @destid: Destination ID of the device
1234 * @hopcount: Number of switch hops to the device
1235 * @table: routing table ID (global or port-specific)
1236 */
1237static int
1238rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
1239                        u16 table)
1240{
1241        u32 max_destid = 0xff;
1242        u32 i, pef, id_inc = 1, ext_cfg = 0;
1243        u32 port_sel = RIO_INVALID_ROUTE;
1244
1245        if (table == RIO_GLOBAL_TABLE) {
1246                rio_mport_read_config_32(mport, destid, hopcount,
1247                                         RIO_PEF_CAR, &pef);
1248
1249                if (mport->sys_size) {
1250                        rio_mport_read_config_32(mport, destid, hopcount,
1251                                                 RIO_SWITCH_RT_LIMIT,
1252                                                 &max_destid);
1253                        max_destid &= RIO_RT_MAX_DESTID;
1254                }
1255
1256                if (pef & RIO_PEF_EXT_RT) {
1257                        ext_cfg = 0x80000000;
1258                        id_inc = 4;
1259                        port_sel = (RIO_INVALID_ROUTE << 24) |
1260                                   (RIO_INVALID_ROUTE << 16) |
1261                                   (RIO_INVALID_ROUTE << 8) |
1262                                   RIO_INVALID_ROUTE;
1263                }
1264
1265                for (i = 0; i <= max_destid;) {
1266                        rio_mport_write_config_32(mport, destid, hopcount,
1267                                        RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1268                                        ext_cfg | i);
1269                        rio_mport_write_config_32(mport, destid, hopcount,
1270                                        RIO_STD_RTE_CONF_PORT_SEL_CSR,
1271                                        port_sel);
1272                        i += id_inc;
1273                }
1274        }
1275
1276        udelay(10);
1277        return 0;
1278}
1279
1280/**
1281 * rio_lock_device - Acquires host device lock for specified device
1282 * @port: Master port to send transaction
1283 * @destid: Destination ID for device/switch
1284 * @hopcount: Hopcount to reach switch
1285 * @wait_ms: Max wait time in msec (0 = no timeout)
1286 *
1287 * Attepts to acquire host device lock for specified device
1288 * Returns 0 if device lock acquired or EINVAL if timeout expires.
1289 */
1290int rio_lock_device(struct rio_mport *port, u16 destid,
1291                    u8 hopcount, int wait_ms)
1292{
1293        u32 result;
1294        int tcnt = 0;
1295
1296        /* Attempt to acquire device lock */
1297        rio_mport_write_config_32(port, destid, hopcount,
1298                                  RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
1299        rio_mport_read_config_32(port, destid, hopcount,
1300                                 RIO_HOST_DID_LOCK_CSR, &result);
1301
1302        while (result != port->host_deviceid) {
1303                if (wait_ms != 0 && tcnt == wait_ms) {
1304                        pr_debug("RIO: timeout when locking device %x:%x\n",
1305                                destid, hopcount);
1306                        return -EINVAL;
1307                }
1308
1309                /* Delay a bit */
1310                mdelay(1);
1311                tcnt++;
1312                /* Try to acquire device lock again */
1313                rio_mport_write_config_32(port, destid,
1314                        hopcount,
1315                        RIO_HOST_DID_LOCK_CSR,
1316                        port->host_deviceid);
1317                rio_mport_read_config_32(port, destid,
1318                        hopcount,
1319                        RIO_HOST_DID_LOCK_CSR, &result);
1320        }
1321
1322        return 0;
1323}
1324EXPORT_SYMBOL_GPL(rio_lock_device);
1325
1326/**
1327 * rio_unlock_device - Releases host device lock for specified device
1328 * @port: Master port to send transaction
1329 * @destid: Destination ID for device/switch
1330 * @hopcount: Hopcount to reach switch
1331 *
1332 * Returns 0 if device lock released or EINVAL if fails.
1333 */
1334int rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
1335{
1336        u32 result;
1337
1338        /* Release device lock */
1339        rio_mport_write_config_32(port, destid,
1340                                  hopcount,
1341                                  RIO_HOST_DID_LOCK_CSR,
1342                                  port->host_deviceid);
1343        rio_mport_read_config_32(port, destid, hopcount,
1344                RIO_HOST_DID_LOCK_CSR, &result);
1345        if ((result & 0xffff) != 0xffff) {
1346                pr_debug("RIO: badness when releasing device lock %x:%x\n",
1347                         destid, hopcount);
1348                return -EINVAL;
1349        }
1350
1351        return 0;
1352}
1353EXPORT_SYMBOL_GPL(rio_unlock_device);
1354
1355/**
1356 * rio_route_add_entry- Add a route entry to a switch routing table
1357 * @rdev: RIO device
1358 * @table: Routing table ID
1359 * @route_destid: Destination ID to be routed
1360 * @route_port: Port number to be routed
1361 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1362 *
1363 * If available calls the switch specific add_entry() method to add a route
1364 * entry into a switch routing table. Otherwise uses standard RT update method
1365 * as defined by RapidIO specification. A specific routing table can be selected
1366 * using the @table argument if a switch has per port routing tables or
1367 * the standard (or global) table may be used by passing
1368 * %RIO_GLOBAL_TABLE in @table.
1369 *
1370 * Returns %0 on success or %-EINVAL on failure.
1371 */
1372int rio_route_add_entry(struct rio_dev *rdev,
1373                        u16 table, u16 route_destid, u8 route_port, int lock)
1374{
1375        int rc = -EINVAL;
1376        struct rio_switch_ops *ops = rdev->rswitch->ops;
1377
1378        if (lock) {
1379                rc = rio_lock_device(rdev->net->hport, rdev->destid,
1380                                     rdev->hopcount, 1000);
1381                if (rc)
1382                        return rc;
1383        }
1384
1385        spin_lock(&rdev->rswitch->lock);
1386
1387        if (ops == NULL || ops->add_entry == NULL) {
1388                rc = rio_std_route_add_entry(rdev->net->hport, rdev->destid,
1389                                             rdev->hopcount, table,
1390                                             route_destid, route_port);
1391        } else if (try_module_get(ops->owner)) {
1392                rc = ops->add_entry(rdev->net->hport, rdev->destid,
1393                                    rdev->hopcount, table, route_destid,
1394                                    route_port);
1395                module_put(ops->owner);
1396        }
1397
1398        spin_unlock(&rdev->rswitch->lock);
1399
1400        if (lock)
1401                rio_unlock_device(rdev->net->hport, rdev->destid,
1402                                  rdev->hopcount);
1403
1404        return rc;
1405}
1406EXPORT_SYMBOL_GPL(rio_route_add_entry);
1407
1408/**
1409 * rio_route_get_entry- Read an entry from a switch routing table
1410 * @rdev: RIO device
1411 * @table: Routing table ID
1412 * @route_destid: Destination ID to be routed
1413 * @route_port: Pointer to read port number into
1414 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1415 *
1416 * If available calls the switch specific get_entry() method to fetch a route
1417 * entry from a switch routing table. Otherwise uses standard RT read method
1418 * as defined by RapidIO specification. A specific routing table can be selected
1419 * using the @table argument if a switch has per port routing tables or
1420 * the standard (or global) table may be used by passing
1421 * %RIO_GLOBAL_TABLE in @table.
1422 *
1423 * Returns %0 on success or %-EINVAL on failure.
1424 */
1425int rio_route_get_entry(struct rio_dev *rdev, u16 table,
1426                        u16 route_destid, u8 *route_port, int lock)
1427{
1428        int rc = -EINVAL;
1429        struct rio_switch_ops *ops = rdev->rswitch->ops;
1430
1431        if (lock) {
1432                rc = rio_lock_device(rdev->net->hport, rdev->destid,
1433                                     rdev->hopcount, 1000);
1434                if (rc)
1435                        return rc;
1436        }
1437
1438        spin_lock(&rdev->rswitch->lock);
1439
1440        if (ops == NULL || ops->get_entry == NULL) {
1441                rc = rio_std_route_get_entry(rdev->net->hport, rdev->destid,
1442                                             rdev->hopcount, table,
1443                                             route_destid, route_port);
1444        } else if (try_module_get(ops->owner)) {
1445                rc = ops->get_entry(rdev->net->hport, rdev->destid,
1446                                    rdev->hopcount, table, route_destid,
1447                                    route_port);
1448                module_put(ops->owner);
1449        }
1450
1451        spin_unlock(&rdev->rswitch->lock);
1452
1453        if (lock)
1454                rio_unlock_device(rdev->net->hport, rdev->destid,
1455                                  rdev->hopcount);
1456        return rc;
1457}
1458EXPORT_SYMBOL_GPL(rio_route_get_entry);
1459
1460/**
1461 * rio_route_clr_table - Clear a switch routing table
1462 * @rdev: RIO device
1463 * @table: Routing table ID
1464 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1465 *
1466 * If available calls the switch specific clr_table() method to clear a switch
1467 * routing table. Otherwise uses standard RT write method as defined by RapidIO
1468 * specification. A specific routing table can be selected using the @table
1469 * argument if a switch has per port routing tables or the standard (or global)
1470 * table may be used by passing %RIO_GLOBAL_TABLE in @table.
1471 *
1472 * Returns %0 on success or %-EINVAL on failure.
1473 */
1474int rio_route_clr_table(struct rio_dev *rdev, u16 table, int lock)
1475{
1476        int rc = -EINVAL;
1477        struct rio_switch_ops *ops = rdev->rswitch->ops;
1478
1479        if (lock) {
1480                rc = rio_lock_device(rdev->net->hport, rdev->destid,
1481                                     rdev->hopcount, 1000);
1482                if (rc)
1483                        return rc;
1484        }
1485
1486        spin_lock(&rdev->rswitch->lock);
1487
1488        if (ops == NULL || ops->clr_table == NULL) {
1489                rc = rio_std_route_clr_table(rdev->net->hport, rdev->destid,
1490                                             rdev->hopcount, table);
1491        } else if (try_module_get(ops->owner)) {
1492                rc = ops->clr_table(rdev->net->hport, rdev->destid,
1493                                    rdev->hopcount, table);
1494
1495                module_put(ops->owner);
1496        }
1497
1498        spin_unlock(&rdev->rswitch->lock);
1499
1500        if (lock)
1501                rio_unlock_device(rdev->net->hport, rdev->destid,
1502                                  rdev->hopcount);
1503
1504        return rc;
1505}
1506EXPORT_SYMBOL_GPL(rio_route_clr_table);
1507
1508#ifdef CONFIG_RAPIDIO_DMA_ENGINE
1509
1510static bool rio_chan_filter(struct dma_chan *chan, void *arg)
1511{
1512        struct rio_dev *rdev = arg;
1513
1514        /* Check that DMA device belongs to the right MPORT */
1515        return (rdev->net->hport ==
1516                container_of(chan->device, struct rio_mport, dma));
1517}
1518
1519/**
1520 * rio_request_dma - request RapidIO capable DMA channel that supports
1521 *   specified target RapidIO device.
1522 * @rdev: RIO device control structure
1523 *
1524 * Returns pointer to allocated DMA channel or NULL if failed.
1525 */
1526struct dma_chan *rio_request_dma(struct rio_dev *rdev)
1527{
1528        dma_cap_mask_t mask;
1529        struct dma_chan *dchan;
1530
1531        dma_cap_zero(mask);
1532        dma_cap_set(DMA_SLAVE, mask);
1533        dchan = dma_request_channel(mask, rio_chan_filter, rdev);
1534
1535        return dchan;
1536}
1537EXPORT_SYMBOL_GPL(rio_request_dma);
1538
1539/**
1540 * rio_release_dma - release specified DMA channel
1541 * @dchan: DMA channel to release
1542 */
1543void rio_release_dma(struct dma_chan *dchan)
1544{
1545        dma_release_channel(dchan);
1546}
1547EXPORT_SYMBOL_GPL(rio_release_dma);
1548
1549/**
1550 * rio_dma_prep_slave_sg - RapidIO specific wrapper
1551 *   for device_prep_slave_sg callback defined by DMAENGINE.
1552 * @rdev: RIO device control structure
1553 * @dchan: DMA channel to configure
1554 * @data: RIO specific data descriptor
1555 * @direction: DMA data transfer direction (TO or FROM the device)
1556 * @flags: dmaengine defined flags
1557 *
1558 * Initializes RapidIO capable DMA channel for the specified data transfer.
1559 * Uses DMA channel private extension to pass information related to remote
1560 * target RIO device.
1561 * Returns pointer to DMA transaction descriptor or NULL if failed.
1562 */
1563struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
1564        struct dma_chan *dchan, struct rio_dma_data *data,
1565        enum dma_transfer_direction direction, unsigned long flags)
1566{
1567        struct dma_async_tx_descriptor *txd = NULL;
1568        struct rio_dma_ext rio_ext;
1569
1570        if (dchan->device->device_prep_slave_sg == NULL) {
1571                pr_err("%s: prep_rio_sg == NULL\n", __func__);
1572                return NULL;
1573        }
1574
1575        rio_ext.destid = rdev->destid;
1576        rio_ext.rio_addr_u = data->rio_addr_u;
1577        rio_ext.rio_addr = data->rio_addr;
1578        rio_ext.wr_type = data->wr_type;
1579
1580        txd = dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
1581                                        direction, flags, &rio_ext);
1582
1583        return txd;
1584}
1585EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
1586
1587#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1588
1589/**
1590 * rio_find_mport - find RIO mport by its ID
1591 * @mport_id: number (ID) of mport device
1592 *
1593 * Given a RIO mport number, the desired mport is located
1594 * in the global list of mports. If the mport is found, a pointer to its
1595 * data structure is returned.  If no mport is found, %NULL is returned.
1596 */
1597struct rio_mport *rio_find_mport(int mport_id)
1598{
1599        struct rio_mport *port;
1600
1601        mutex_lock(&rio_mport_list_lock);
1602        list_for_each_entry(port, &rio_mports, node) {
1603                if (port->id == mport_id)
1604                        goto found;
1605        }
1606        port = NULL;
1607found:
1608        mutex_unlock(&rio_mport_list_lock);
1609
1610        return port;
1611}
1612
1613/**
1614 * rio_register_scan - enumeration/discovery method registration interface
1615 * @mport_id: mport device ID for which fabric scan routine has to be set
1616 *            (RIO_MPORT_ANY = set for all available mports)
1617 * @scan_ops: enumeration/discovery operations structure
1618 *
1619 * Registers enumeration/discovery operations with RapidIO subsystem and
1620 * attaches it to the specified mport device (or all available mports
1621 * if RIO_MPORT_ANY is specified).
1622 *
1623 * Returns error if the mport already has an enumerator attached to it.
1624 * In case of RIO_MPORT_ANY skips mports with valid scan routines (no error).
1625 */
1626int rio_register_scan(int mport_id, struct rio_scan *scan_ops)
1627{
1628        struct rio_mport *port;
1629        struct rio_scan_node *scan;
1630        int rc = 0;
1631
1632        pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
1633
1634        if ((mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS) ||
1635            !scan_ops)
1636                return -EINVAL;
1637
1638        mutex_lock(&rio_mport_list_lock);
1639
1640        /*
1641         * Check if there is another enumerator already registered for
1642         * the same mport ID (including RIO_MPORT_ANY). Multiple enumerators
1643         * for the same mport ID are not supported.
1644         */
1645        list_for_each_entry(scan, &rio_scans, node) {
1646                if (scan->mport_id == mport_id) {
1647                        rc = -EBUSY;
1648                        goto err_out;
1649                }
1650        }
1651
1652        /*
1653         * Allocate and initialize new scan registration node.
1654         */
1655        scan = kzalloc(sizeof(*scan), GFP_KERNEL);
1656        if (!scan) {
1657                rc = -ENOMEM;
1658                goto err_out;
1659        }
1660
1661        scan->mport_id = mport_id;
1662        scan->ops = scan_ops;
1663
1664        /*
1665         * Traverse the list of registered mports to attach this new scan.
1666         *
1667         * The new scan with matching mport ID overrides any previously attached
1668         * scan assuming that old scan (if any) is the default one (based on the
1669         * enumerator registration check above).
1670         * If the new scan is the global one, it will be attached only to mports
1671         * that do not have their own individual operations already attached.
1672         */
1673        list_for_each_entry(port, &rio_mports, node) {
1674                if (port->id == mport_id) {
1675                        port->nscan = scan_ops;
1676                        break;
1677                } else if (mport_id == RIO_MPORT_ANY && !port->nscan)
1678                        port->nscan = scan_ops;
1679        }
1680
1681        list_add_tail(&scan->node, &rio_scans);
1682
1683err_out:
1684        mutex_unlock(&rio_mport_list_lock);
1685
1686        return rc;
1687}
1688EXPORT_SYMBOL_GPL(rio_register_scan);
1689
1690/**
1691 * rio_unregister_scan - removes enumeration/discovery method from mport
1692 * @mport_id: mport device ID for which fabric scan routine has to be
1693 *            unregistered (RIO_MPORT_ANY = apply to all mports that use
1694 *            the specified scan_ops)
1695 * @scan_ops: enumeration/discovery operations structure
1696 *
1697 * Removes enumeration or discovery method assigned to the specified mport
1698 * device. If RIO_MPORT_ANY is specified, removes the specified operations from
1699 * all mports that have them attached.
1700 */
1701int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops)
1702{
1703        struct rio_mport *port;
1704        struct rio_scan_node *scan;
1705
1706        pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
1707
1708        if (mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS)
1709                return -EINVAL;
1710
1711        mutex_lock(&rio_mport_list_lock);
1712
1713        list_for_each_entry(port, &rio_mports, node)
1714                if (port->id == mport_id ||
1715                    (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops))
1716                        port->nscan = NULL;
1717
1718        list_for_each_entry(scan, &rio_scans, node) {
1719                if (scan->mport_id == mport_id) {
1720                        list_del(&scan->node);
1721                        kfree(scan);
1722                        break;
1723                }
1724        }
1725
1726        mutex_unlock(&rio_mport_list_lock);
1727
1728        return 0;
1729}
1730EXPORT_SYMBOL_GPL(rio_unregister_scan);
1731
1732/**
1733 * rio_mport_scan - execute enumeration/discovery on the specified mport
1734 * @mport_id: number (ID) of mport device
1735 */
1736int rio_mport_scan(int mport_id)
1737{
1738        struct rio_mport *port = NULL;
1739        int rc;
1740
1741        mutex_lock(&rio_mport_list_lock);
1742        list_for_each_entry(port, &rio_mports, node) {
1743                if (port->id == mport_id)
1744                        goto found;
1745        }
1746        mutex_unlock(&rio_mport_list_lock);
1747        return -ENODEV;
1748found:
1749        if (!port->nscan) {
1750                mutex_unlock(&rio_mport_list_lock);
1751                return -EINVAL;
1752        }
1753
1754        if (!try_module_get(port->nscan->owner)) {
1755                mutex_unlock(&rio_mport_list_lock);
1756                return -ENODEV;
1757        }
1758
1759        mutex_unlock(&rio_mport_list_lock);
1760
1761        if (port->host_deviceid >= 0)
1762                rc = port->nscan->enumerate(port, 0);
1763        else
1764                rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT);
1765
1766        module_put(port->nscan->owner);
1767        return rc;
1768}
1769
1770static void rio_fixup_device(struct rio_dev *dev)
1771{
1772}
1773
1774static int rio_init(void)
1775{
1776        struct rio_dev *dev = NULL;
1777
1778        while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
1779                rio_fixup_device(dev);
1780        }
1781        return 0;
1782}
1783
1784static struct workqueue_struct *rio_wq;
1785
1786struct rio_disc_work {
1787        struct work_struct      work;
1788        struct rio_mport        *mport;
1789};
1790
1791static void disc_work_handler(struct work_struct *_work)
1792{
1793        struct rio_disc_work *work;
1794
1795        work = container_of(_work, struct rio_disc_work, work);
1796        pr_debug("RIO: discovery work for mport %d %s\n",
1797                 work->mport->id, work->mport->name);
1798        if (try_module_get(work->mport->nscan->owner)) {
1799                work->mport->nscan->discover(work->mport, 0);
1800                module_put(work->mport->nscan->owner);
1801        }
1802}
1803
1804int rio_init_mports(void)
1805{
1806        struct rio_mport *port;
1807        struct rio_disc_work *work;
1808        int n = 0;
1809
1810        if (!next_portid)
1811                return -ENODEV;
1812
1813        /*
1814         * First, run enumerations and check if we need to perform discovery
1815         * on any of the registered mports.
1816         */
1817        mutex_lock(&rio_mport_list_lock);
1818        list_for_each_entry(port, &rio_mports, node) {
1819                if (port->host_deviceid >= 0) {
1820                        if (port->nscan && try_module_get(port->nscan->owner)) {
1821                                port->nscan->enumerate(port, 0);
1822                                module_put(port->nscan->owner);
1823                        }
1824                } else
1825                        n++;
1826        }
1827        mutex_unlock(&rio_mport_list_lock);
1828
1829        if (!n)
1830                goto no_disc;
1831
1832        /*
1833         * If we have mports that require discovery schedule a discovery work
1834         * for each of them. If the code below fails to allocate needed
1835         * resources, exit without error to keep results of enumeration
1836         * process (if any).
1837         * TODO: Implement restart of discovery process for all or
1838         * individual discovering mports.
1839         */
1840        rio_wq = alloc_workqueue("riodisc", 0, 0);
1841        if (!rio_wq) {
1842                pr_err("RIO: unable allocate rio_wq\n");
1843                goto no_disc;
1844        }
1845
1846        work = kcalloc(n, sizeof *work, GFP_KERNEL);
1847        if (!work) {
1848                pr_err("RIO: no memory for work struct\n");
1849                destroy_workqueue(rio_wq);
1850                goto no_disc;
1851        }
1852
1853        n = 0;
1854        mutex_lock(&rio_mport_list_lock);
1855        list_for_each_entry(port, &rio_mports, node) {
1856                if (port->host_deviceid < 0 && port->nscan) {
1857                        work[n].mport = port;
1858                        INIT_WORK(&work[n].work, disc_work_handler);
1859                        queue_work(rio_wq, &work[n].work);
1860                        n++;
1861                }
1862        }
1863
1864        flush_workqueue(rio_wq);
1865        mutex_unlock(&rio_mport_list_lock);
1866        pr_debug("RIO: destroy discovery workqueue\n");
1867        destroy_workqueue(rio_wq);
1868        kfree(work);
1869
1870no_disc:
1871        rio_init();
1872
1873        return 0;
1874}
1875
1876static int rio_get_hdid(int index)
1877{
1878        if (ids_num == 0 || ids_num <= index || index >= RIO_MAX_MPORTS)
1879                return -1;
1880
1881        return hdid[index];
1882}
1883
1884int rio_register_mport(struct rio_mport *port)
1885{
1886        struct rio_scan_node *scan = NULL;
1887
1888        if (next_portid >= RIO_MAX_MPORTS) {
1889                pr_err("RIO: reached specified max number of mports\n");
1890                return 1;
1891        }
1892
1893        port->id = next_portid++;
1894        port->host_deviceid = rio_get_hdid(port->id);
1895        port->nscan = NULL;
1896
1897        mutex_lock(&rio_mport_list_lock);
1898        list_add_tail(&port->node, &rio_mports);
1899
1900        /*
1901         * Check if there are any registered enumeration/discovery operations
1902         * that have to be attached to the added mport.
1903         */
1904        list_for_each_entry(scan, &rio_scans, node) {
1905                if (port->id == scan->mport_id ||
1906                    scan->mport_id == RIO_MPORT_ANY) {
1907                        port->nscan = scan->ops;
1908                        if (port->id == scan->mport_id)
1909                                break;
1910                }
1911        }
1912        mutex_unlock(&rio_mport_list_lock);
1913
1914        pr_debug("RIO: %s %s id=%d\n", __func__, port->name, port->id);
1915        return 0;
1916}
1917EXPORT_SYMBOL_GPL(rio_register_mport);
1918
1919EXPORT_SYMBOL_GPL(rio_local_get_device_id);
1920EXPORT_SYMBOL_GPL(rio_get_device);
1921EXPORT_SYMBOL_GPL(rio_get_asm);
1922EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
1923EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
1924EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
1925EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
1926EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
1927EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
1928EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
1929EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
1930EXPORT_SYMBOL_GPL(rio_init_mports);
1931
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