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 Integrated Device Technology, Inc.
   9 * Alex Bounine <alexandre.bounine@idt.com>
  10 * - Added Port-Write/Error Management initialization and handling
  11 *
  12 * This program is free software; you can redistribute  it and/or modify it
  13 * under  the terms of  the GNU General  Public License as published by the
  14 * Free Software Foundation;  either version 2 of the  License, or (at your
  15 * option) any later version.
  16 */
  17
  18#include <linux/types.h>
  19#include <linux/kernel.h>
  20
  21#include <linux/delay.h>
  22#include <linux/init.h>
  23#include <linux/rio.h>
  24#include <linux/rio_drv.h>
  25#include <linux/rio_ids.h>
  26#include <linux/rio_regs.h>
  27#include <linux/module.h>
  28#include <linux/spinlock.h>
  29#include <linux/slab.h>
  30#include <linux/interrupt.h>
  31
  32#include "rio.h"
  33
  34static LIST_HEAD(rio_mports);
  35static unsigned char next_portid;
  36static DEFINE_SPINLOCK(rio_mmap_lock);
  37
  38/**
  39 * rio_local_get_device_id - Get the base/extended device id for a port
  40 * @port: RIO master port from which to get the deviceid
  41 *
  42 * Reads the base/extended device id from the local device
  43 * implementing the master port. Returns the 8/16-bit device
  44 * id.
  45 */
  46u16 rio_local_get_device_id(struct rio_mport *port)
  47{
  48        u32 result;
  49
  50        rio_local_read_config_32(port, RIO_DID_CSR, &result);
  51
  52        return (RIO_GET_DID(port->sys_size, result));
  53}
  54
  55/**
  56 * rio_request_inb_mbox - request inbound mailbox service
  57 * @mport: RIO master port from which to allocate the mailbox resource
  58 * @dev_id: Device specific pointer to pass on event
  59 * @mbox: Mailbox number to claim
  60 * @entries: Number of entries in inbound mailbox queue
  61 * @minb: Callback to execute when inbound message is received
  62 *
  63 * Requests ownership of an inbound mailbox resource and binds
  64 * a callback function to the resource. Returns %0 on success.
  65 */
  66int rio_request_inb_mbox(struct rio_mport *mport,
  67                         void *dev_id,
  68                         int mbox,
  69                         int entries,
  70                         void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
  71                                       int slot))
  72{
  73        int rc = -ENOSYS;
  74        struct resource *res;
  75
  76        if (mport->ops->open_inb_mbox == NULL)
  77                goto out;
  78
  79        res = kmalloc(sizeof(struct resource), GFP_KERNEL);
  80
  81        if (res) {
  82                rio_init_mbox_res(res, mbox, mbox);
  83
  84                /* Make sure this mailbox isn't in use */
  85                if ((rc =
  86                     request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
  87                                      res)) < 0) {
  88                        kfree(res);
  89                        goto out;
  90                }
  91
  92                mport->inb_msg[mbox].res = res;
  93
  94                /* Hook the inbound message callback */
  95                mport->inb_msg[mbox].mcback = minb;
  96
  97                rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
  98        } else
  99                rc = -ENOMEM;
 100
 101      out:
 102        return rc;
 103}
 104
 105/**
 106 * rio_release_inb_mbox - release inbound mailbox message service
 107 * @mport: RIO master port from which to release the mailbox resource
 108 * @mbox: Mailbox number to release
 109 *
 110 * Releases ownership of an inbound mailbox resource. Returns 0
 111 * if the request has been satisfied.
 112 */
 113int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
 114{
 115        if (mport->ops->close_inb_mbox) {
 116                mport->ops->close_inb_mbox(mport, mbox);
 117
 118                /* Release the mailbox resource */
 119                return release_resource(mport->inb_msg[mbox].res);
 120        } else
 121                return -ENOSYS;
 122}
 123
 124/**
 125 * rio_request_outb_mbox - request outbound mailbox service
 126 * @mport: RIO master port from which to allocate the mailbox resource
 127 * @dev_id: Device specific pointer to pass on event
 128 * @mbox: Mailbox number to claim
 129 * @entries: Number of entries in outbound mailbox queue
 130 * @moutb: Callback to execute when outbound message is sent
 131 *
 132 * Requests ownership of an outbound mailbox resource and binds
 133 * a callback function to the resource. Returns 0 on success.
 134 */
 135int rio_request_outb_mbox(struct rio_mport *mport,
 136                          void *dev_id,
 137                          int mbox,
 138                          int entries,
 139                          void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
 140{
 141        int rc = -ENOSYS;
 142        struct resource *res;
 143
 144        if (mport->ops->open_outb_mbox == NULL)
 145                goto out;
 146
 147        res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 148
 149        if (res) {
 150                rio_init_mbox_res(res, mbox, mbox);
 151
 152                /* Make sure this outbound mailbox isn't in use */
 153                if ((rc =
 154                     request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
 155                                      res)) < 0) {
 156                        kfree(res);
 157                        goto out;
 158                }
 159
 160                mport->outb_msg[mbox].res = res;
 161
 162                /* Hook the inbound message callback */
 163                mport->outb_msg[mbox].mcback = moutb;
 164
 165                rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
 166        } else
 167                rc = -ENOMEM;
 168
 169      out:
 170        return rc;
 171}
 172
 173/**
 174 * rio_release_outb_mbox - release outbound mailbox message service
 175 * @mport: RIO master port from which to release the mailbox resource
 176 * @mbox: Mailbox number to release
 177 *
 178 * Releases ownership of an inbound mailbox resource. Returns 0
 179 * if the request has been satisfied.
 180 */
 181int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
 182{
 183        if (mport->ops->close_outb_mbox) {
 184                mport->ops->close_outb_mbox(mport, mbox);
 185
 186                /* Release the mailbox resource */
 187                return release_resource(mport->outb_msg[mbox].res);
 188        } else
 189                return -ENOSYS;
 190}
 191
 192/**
 193 * rio_setup_inb_dbell - bind inbound doorbell callback
 194 * @mport: RIO master port to bind the doorbell callback
 195 * @dev_id: Device specific pointer to pass on event
 196 * @res: Doorbell message resource
 197 * @dinb: Callback to execute when doorbell is received
 198 *
 199 * Adds a doorbell resource/callback pair into a port's
 200 * doorbell event list. Returns 0 if the request has been
 201 * satisfied.
 202 */
 203static int
 204rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
 205                    void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
 206                                  u16 info))
 207{
 208        int rc = 0;
 209        struct rio_dbell *dbell;
 210
 211        if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
 212                rc = -ENOMEM;
 213                goto out;
 214        }
 215
 216        dbell->res = res;
 217        dbell->dinb = dinb;
 218        dbell->dev_id = dev_id;
 219
 220        list_add_tail(&dbell->node, &mport->dbells);
 221
 222      out:
 223        return rc;
 224}
 225
 226/**
 227 * rio_request_inb_dbell - request inbound doorbell message service
 228 * @mport: RIO master port from which to allocate the doorbell resource
 229 * @dev_id: Device specific pointer to pass on event
 230 * @start: Doorbell info range start
 231 * @end: Doorbell info range end
 232 * @dinb: Callback to execute when doorbell is received
 233 *
 234 * Requests ownership of an inbound doorbell resource and binds
 235 * a callback function to the resource. Returns 0 if the request
 236 * has been satisfied.
 237 */
 238int rio_request_inb_dbell(struct rio_mport *mport,
 239                          void *dev_id,
 240                          u16 start,
 241                          u16 end,
 242                          void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
 243                                        u16 dst, u16 info))
 244{
 245        int rc = 0;
 246
 247        struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 248
 249        if (res) {
 250                rio_init_dbell_res(res, start, end);
 251
 252                /* Make sure these doorbells aren't in use */
 253                if ((rc =
 254                     request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
 255                                      res)) < 0) {
 256                        kfree(res);
 257                        goto out;
 258                }
 259
 260                /* Hook the doorbell callback */
 261                rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
 262        } else
 263                rc = -ENOMEM;
 264
 265      out:
 266        return rc;
 267}
 268
 269/**
 270 * rio_release_inb_dbell - release inbound doorbell message service
 271 * @mport: RIO master port from which to release the doorbell resource
 272 * @start: Doorbell info range start
 273 * @end: Doorbell info range end
 274 *
 275 * Releases ownership of an inbound doorbell resource and removes
 276 * callback from the doorbell event list. Returns 0 if the request
 277 * has been satisfied.
 278 */
 279int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
 280{
 281        int rc = 0, found = 0;
 282        struct rio_dbell *dbell;
 283
 284        list_for_each_entry(dbell, &mport->dbells, node) {
 285                if ((dbell->res->start == start) && (dbell->res->end == end)) {
 286                        found = 1;
 287                        break;
 288                }
 289        }
 290
 291        /* If we can't find an exact match, fail */
 292        if (!found) {
 293                rc = -EINVAL;
 294                goto out;
 295        }
 296
 297        /* Delete from list */
 298        list_del(&dbell->node);
 299
 300        /* Release the doorbell resource */
 301        rc = release_resource(dbell->res);
 302
 303        /* Free the doorbell event */
 304        kfree(dbell);
 305
 306      out:
 307        return rc;
 308}
 309
 310/**
 311 * rio_request_outb_dbell - request outbound doorbell message range
 312 * @rdev: RIO device from which to allocate the doorbell resource
 313 * @start: Doorbell message range start
 314 * @end: Doorbell message range end
 315 *
 316 * Requests ownership of a doorbell message range. Returns a resource
 317 * if the request has been satisfied or %NULL on failure.
 318 */
 319struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
 320                                        u16 end)
 321{
 322        struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 323
 324        if (res) {
 325                rio_init_dbell_res(res, start, end);
 326
 327                /* Make sure these doorbells aren't in use */
 328                if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
 329                    < 0) {
 330                        kfree(res);
 331                        res = NULL;
 332                }
 333        }
 334
 335        return res;
 336}
 337
 338/**
 339 * rio_release_outb_dbell - release outbound doorbell message range
 340 * @rdev: RIO device from which to release the doorbell resource
 341 * @res: Doorbell resource to be freed
 342 *
 343 * Releases ownership of a doorbell message range. Returns 0 if the
 344 * request has been satisfied.
 345 */
 346int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
 347{
 348        int rc = release_resource(res);
 349
 350        kfree(res);
 351
 352        return rc;
 353}
 354
 355/**
 356 * rio_request_inb_pwrite - request inbound port-write message service
 357 * @rdev: RIO device to which register inbound port-write callback routine
 358 * @pwcback: Callback routine to execute when port-write is received
 359 *
 360 * Binds a port-write callback function to the RapidIO device.
 361 * Returns 0 if the request has been satisfied.
 362 */
 363int rio_request_inb_pwrite(struct rio_dev *rdev,
 364        int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
 365{
 366        int rc = 0;
 367
 368        spin_lock(&rio_global_list_lock);
 369        if (rdev->pwcback != NULL)
 370                rc = -ENOMEM;
 371        else
 372                rdev->pwcback = pwcback;
 373
 374        spin_unlock(&rio_global_list_lock);
 375        return rc;
 376}
 377EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);
 378
 379/**
 380 * rio_release_inb_pwrite - release inbound port-write message service
 381 * @rdev: RIO device which registered for inbound port-write callback
 382 *
 383 * Removes callback from the rio_dev structure. Returns 0 if the request
 384 * has been satisfied.
 385 */
 386int rio_release_inb_pwrite(struct rio_dev *rdev)
 387{
 388        int rc = -ENOMEM;
 389
 390        spin_lock(&rio_global_list_lock);
 391        if (rdev->pwcback) {
 392                rdev->pwcback = NULL;
 393                rc = 0;
 394        }
 395
 396        spin_unlock(&rio_global_list_lock);
 397        return rc;
 398}
 399EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
 400
 401/**
 402 * rio_map_inb_region -- Map inbound memory region.
 403 * @mport: Master port.
 404 * @local: physical address of memory region to be mapped
 405 * @rbase: RIO base address assigned to this window
 406 * @size: Size of the memory region
 407 * @rflags: Flags for mapping.
 408 *
 409 * Return: 0 -- Success.
 410 *
 411 * This function will create the mapping from RIO space to local memory.
 412 */
 413int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
 414                        u64 rbase, u32 size, u32 rflags)
 415{
 416        int rc = 0;
 417        unsigned long flags;
 418
 419        if (!mport->ops->map_inb)
 420                return -1;
 421        spin_lock_irqsave(&rio_mmap_lock, flags);
 422        rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
 423        spin_unlock_irqrestore(&rio_mmap_lock, flags);
 424        return rc;
 425}
 426EXPORT_SYMBOL_GPL(rio_map_inb_region);
 427
 428/**
 429 * rio_unmap_inb_region -- Unmap the inbound memory region
 430 * @mport: Master port
 431 * @lstart: physical address of memory region to be unmapped
 432 */
 433void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
 434{
 435        unsigned long flags;
 436        if (!mport->ops->unmap_inb)
 437                return;
 438        spin_lock_irqsave(&rio_mmap_lock, flags);
 439        mport->ops->unmap_inb(mport, lstart);
 440        spin_unlock_irqrestore(&rio_mmap_lock, flags);
 441}
 442EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
 443
 444/**
 445 * rio_mport_get_physefb - Helper function that returns register offset
 446 *                      for Physical Layer Extended Features Block.
 447 * @port: Master port to issue transaction
 448 * @local: Indicate a local master port or remote device access
 449 * @destid: Destination ID of the device
 450 * @hopcount: Number of switch hops to the device
 451 */
 452u32
 453rio_mport_get_physefb(struct rio_mport *port, int local,
 454                      u16 destid, u8 hopcount)
 455{
 456        u32 ext_ftr_ptr;
 457        u32 ftr_header;
 458
 459        ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);
 460
 461        while (ext_ftr_ptr)  {
 462                if (local)
 463                        rio_local_read_config_32(port, ext_ftr_ptr,
 464                                                 &ftr_header);
 465                else
 466                        rio_mport_read_config_32(port, destid, hopcount,
 467                                                 ext_ftr_ptr, &ftr_header);
 468
 469                ftr_header = RIO_GET_BLOCK_ID(ftr_header);
 470                switch (ftr_header) {
 471
 472                case RIO_EFB_SER_EP_ID_V13P:
 473                case RIO_EFB_SER_EP_REC_ID_V13P:
 474                case RIO_EFB_SER_EP_FREE_ID_V13P:
 475                case RIO_EFB_SER_EP_ID:
 476                case RIO_EFB_SER_EP_REC_ID:
 477                case RIO_EFB_SER_EP_FREE_ID:
 478                case RIO_EFB_SER_EP_FREC_ID:
 479
 480                        return ext_ftr_ptr;
 481
 482                default:
 483                        break;
 484                }
 485
 486                ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
 487                                                hopcount, ext_ftr_ptr);
 488        }
 489
 490        return ext_ftr_ptr;
 491}
 492
 493/**
 494 * rio_get_comptag - Begin or continue searching for a RIO device by component tag
 495 * @comp_tag: RIO component tag to match
 496 * @from: Previous RIO device found in search, or %NULL for new search
 497 *
 498 * Iterates through the list of known RIO devices. If a RIO device is
 499 * found with a matching @comp_tag, a pointer to its device
 500 * structure is returned. Otherwise, %NULL is returned. A new search
 501 * is initiated by passing %NULL to the @from argument. Otherwise, if
 502 * @from is not %NULL, searches continue from next device on the global
 503 * list.
 504 */
 505struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
 506{
 507        struct list_head *n;
 508        struct rio_dev *rdev;
 509
 510        spin_lock(&rio_global_list_lock);
 511        n = from ? from->global_list.next : rio_devices.next;
 512
 513        while (n && (n != &rio_devices)) {
 514                rdev = rio_dev_g(n);
 515                if (rdev->comp_tag == comp_tag)
 516                        goto exit;
 517                n = n->next;
 518        }
 519        rdev = NULL;
 520exit:
 521        spin_unlock(&rio_global_list_lock);
 522        return rdev;
 523}
 524
 525/**
 526 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
 527 * @rdev: Pointer to RIO device control structure
 528 * @pnum: Switch port number to set LOCKOUT bit
 529 * @lock: Operation : set (=1) or clear (=0)
 530 */
 531int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
 532{
 533        u32 regval;
 534
 535        rio_read_config_32(rdev,
 536                                 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
 537                                 &regval);
 538        if (lock)
 539                regval |= RIO_PORT_N_CTL_LOCKOUT;
 540        else
 541                regval &= ~RIO_PORT_N_CTL_LOCKOUT;
 542
 543        rio_write_config_32(rdev,
 544                                  rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
 545                                  regval);
 546        return 0;
 547}
 548
 549/**
 550 * rio_chk_dev_route - Validate route to the specified device.
 551 * @rdev:  RIO device failed to respond
 552 * @nrdev: Last active device on the route to rdev
 553 * @npnum: nrdev's port number on the route to rdev
 554 *
 555 * Follows a route to the specified RIO device to determine the last available
 556 * device (and corresponding RIO port) on the route.
 557 */
 558static int
 559rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
 560{
 561        u32 result;
 562        int p_port, rc = -EIO;
 563        struct rio_dev *prev = NULL;
 564
 565        /* Find switch with failed RIO link */
 566        while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
 567                if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
 568                        prev = rdev->prev;
 569                        break;
 570                }
 571                rdev = rdev->prev;
 572        }
 573
 574        if (prev == NULL)
 575                goto err_out;
 576
 577        p_port = prev->rswitch->route_table[rdev->destid];
 578
 579        if (p_port != RIO_INVALID_ROUTE) {
 580                pr_debug("RIO: link failed on [%s]-P%d\n",
 581                         rio_name(prev), p_port);
 582                *nrdev = prev;
 583                *npnum = p_port;
 584                rc = 0;
 585        } else
 586                pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
 587err_out:
 588        return rc;
 589}
 590
 591/**
 592 * rio_mport_chk_dev_access - Validate access to the specified device.
 593 * @mport: Master port to send transactions
 594 * @destid: Device destination ID in network
 595 * @hopcount: Number of hops into the network
 596 */
 597int
 598rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
 599{
 600        int i = 0;
 601        u32 tmp;
 602
 603        while (rio_mport_read_config_32(mport, destid, hopcount,
 604                                        RIO_DEV_ID_CAR, &tmp)) {
 605                i++;
 606                if (i == RIO_MAX_CHK_RETRY)
 607                        return -EIO;
 608                mdelay(1);
 609        }
 610
 611        return 0;
 612}
 613
 614/**
 615 * rio_chk_dev_access - Validate access to the specified device.
 616 * @rdev: Pointer to RIO device control structure
 617 */
 618static int rio_chk_dev_access(struct rio_dev *rdev)
 619{
 620        return rio_mport_chk_dev_access(rdev->net->hport,
 621                                        rdev->destid, rdev->hopcount);
 622}
 623
 624/**
 625 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
 626 *                        returns link-response (if requested).
 627 * @rdev: RIO devive to issue Input-status command
 628 * @pnum: Device port number to issue the command
 629 * @lnkresp: Response from a link partner
 630 */
 631static int
 632rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
 633{
 634        u32 regval;
 635        int checkcount;
 636
 637        if (lnkresp) {
 638                /* Read from link maintenance response register
 639                 * to clear valid bit */
 640                rio_read_config_32(rdev,
 641                        rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
 642                        &regval);
 643                udelay(50);
 644        }
 645
 646        /* Issue Input-status command */
 647        rio_write_config_32(rdev,
 648                rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum),
 649                RIO_MNT_REQ_CMD_IS);
 650
 651        /* Exit if the response is not expected */
 652        if (lnkresp == NULL)
 653                return 0;
 654
 655        checkcount = 3;
 656        while (checkcount--) {
 657                udelay(50);
 658                rio_read_config_32(rdev,
 659                        rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
 660                        &regval);
 661                if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
 662                        *lnkresp = regval;
 663                        return 0;
 664                }
 665        }
 666
 667        return -EIO;
 668}
 669
 670/**
 671 * rio_clr_err_stopped - Clears port Error-stopped states.
 672 * @rdev: Pointer to RIO device control structure
 673 * @pnum: Switch port number to clear errors
 674 * @err_status: port error status (if 0 reads register from device)
 675 */
 676static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
 677{
 678        struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
 679        u32 regval;
 680        u32 far_ackid, far_linkstat, near_ackid;
 681
 682        if (err_status == 0)
 683                rio_read_config_32(rdev,
 684                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
 685                        &err_status);
 686
 687        if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) {
 688                pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
 689                /*
 690                 * Send a Link-Request/Input-Status control symbol
 691                 */
 692                if (rio_get_input_status(rdev, pnum, &regval)) {
 693                        pr_debug("RIO_EM: Input-status response timeout\n");
 694                        goto rd_err;
 695                }
 696
 697                pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
 698                         pnum, regval);
 699                far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
 700                far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
 701                rio_read_config_32(rdev,
 702                        rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
 703                        &regval);
 704                pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
 705                near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
 706                pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
 707                         " near_ackID=0x%02x\n",
 708                        pnum, far_ackid, far_linkstat, near_ackid);
 709
 710                /*
 711                 * If required, synchronize ackIDs of near and
 712                 * far sides.
 713                 */
 714                if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
 715                    (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
 716                        /* Align near outstanding/outbound ackIDs with
 717                         * far inbound.
 718                         */
 719                        rio_write_config_32(rdev,
 720                                rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
 721                                (near_ackid << 24) |
 722                                        (far_ackid << 8) | far_ackid);
 723                        /* Align far outstanding/outbound ackIDs with
 724                         * near inbound.
 725                         */
 726                        far_ackid++;
 727                        if (nextdev)
 728                                rio_write_config_32(nextdev,
 729                                        nextdev->phys_efptr +
 730                                        RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)),
 731                                        (far_ackid << 24) |
 732                                        (near_ackid << 8) | near_ackid);
 733                        else
 734                                pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n");
 735                }
 736rd_err:
 737                rio_read_config_32(rdev,
 738                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
 739                        &err_status);
 740                pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
 741        }
 742
 743        if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) {
 744                pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
 745                rio_get_input_status(nextdev,
 746                                     RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
 747                udelay(50);
 748
 749                rio_read_config_32(rdev,
 750                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
 751                        &err_status);
 752                pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
 753        }
 754
 755        return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
 756                              RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0;
 757}
 758
 759/**
 760 * rio_inb_pwrite_handler - process inbound port-write message
 761 * @pw_msg: pointer to inbound port-write message
 762 *
 763 * Processes an inbound port-write message. Returns 0 if the request
 764 * has been satisfied.
 765 */
 766int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg)
 767{
 768        struct rio_dev *rdev;
 769        u32 err_status, em_perrdet, em_ltlerrdet;
 770        int rc, portnum;
 771
 772        rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
 773        if (rdev == NULL) {
 774                /* Device removed or enumeration error */
 775                pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
 776                        __func__, pw_msg->em.comptag);
 777                return -EIO;
 778        }
 779
 780        pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
 781
 782#ifdef DEBUG_PW
 783        {
 784        u32 i;
 785        for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32);) {
 786                        pr_debug("0x%02x: %08x %08x %08x %08x\n",
 787                                 i*4, pw_msg->raw[i], pw_msg->raw[i + 1],
 788                                 pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
 789                        i += 4;
 790        }
 791        }
 792#endif
 793
 794        /* Call an external service function (if such is registered
 795         * for this device). This may be the service for endpoints that send
 796         * device-specific port-write messages. End-point messages expected
 797         * to be handled completely by EP specific device driver.
 798         * For switches rc==0 signals that no standard processing required.
 799         */
 800        if (rdev->pwcback != NULL) {
 801                rc = rdev->pwcback(rdev, pw_msg, 0);
 802                if (rc == 0)
 803                        return 0;
 804        }
 805
 806        portnum = pw_msg->em.is_port & 0xFF;
 807
 808        /* Check if device and route to it are functional:
 809         * Sometimes devices may send PW message(s) just before being
 810         * powered down (or link being lost).
 811         */
 812        if (rio_chk_dev_access(rdev)) {
 813                pr_debug("RIO: device access failed - get link partner\n");
 814                /* Scan route to the device and identify failed link.
 815                 * This will replace device and port reported in PW message.
 816                 * PW message should not be used after this point.
 817                 */
 818                if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
 819                        pr_err("RIO: Route trace for %s failed\n",
 820                                rio_name(rdev));
 821                        return -EIO;
 822                }
 823                pw_msg = NULL;
 824        }
 825
 826        /* For End-point devices processing stops here */
 827        if (!(rdev->pef & RIO_PEF_SWITCH))
 828                return 0;
 829
 830        if (rdev->phys_efptr == 0) {
 831                pr_err("RIO_PW: Bad switch initialization for %s\n",
 832                        rio_name(rdev));
 833                return 0;
 834        }
 835
 836        /*
 837         * Process the port-write notification from switch
 838         */
 839        if (rdev->rswitch->em_handle)
 840                rdev->rswitch->em_handle(rdev, portnum);
 841
 842        rio_read_config_32(rdev,
 843                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
 844                        &err_status);
 845        pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);
 846
 847        if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
 848
 849                if (!(rdev->rswitch->port_ok & (1 << portnum))) {
 850                        rdev->rswitch->port_ok |= (1 << portnum);
 851                        rio_set_port_lockout(rdev, portnum, 0);
 852                        /* Schedule Insertion Service */
 853                        pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
 854                               rio_name(rdev), portnum);
 855                }
 856
 857                /* Clear error-stopped states (if reported).
 858                 * Depending on the link partner state, two attempts
 859                 * may be needed for successful recovery.
 860                 */
 861                if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
 862                                  RIO_PORT_N_ERR_STS_PW_INP_ES)) {
 863                        if (rio_clr_err_stopped(rdev, portnum, err_status))
 864                                rio_clr_err_stopped(rdev, portnum, 0);
 865                }
 866        }  else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
 867
 868                if (rdev->rswitch->port_ok & (1 << portnum)) {
 869                        rdev->rswitch->port_ok &= ~(1 << portnum);
 870                        rio_set_port_lockout(rdev, portnum, 1);
 871
 872                        rio_write_config_32(rdev,
 873                                rdev->phys_efptr +
 874                                        RIO_PORT_N_ACK_STS_CSR(portnum),
 875                                RIO_PORT_N_ACK_CLEAR);
 876
 877                        /* Schedule Extraction Service */
 878                        pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
 879                               rio_name(rdev), portnum);
 880                }
 881        }
 882
 883        rio_read_config_32(rdev,
 884                rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
 885        if (em_perrdet) {
 886                pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
 887                         portnum, em_perrdet);
 888                /* Clear EM Port N Error Detect CSR */
 889                rio_write_config_32(rdev,
 890                        rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
 891        }
 892
 893        rio_read_config_32(rdev,
 894                rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
 895        if (em_ltlerrdet) {
 896                pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
 897                         em_ltlerrdet);
 898                /* Clear EM L/T Layer Error Detect CSR */
 899                rio_write_config_32(rdev,
 900                        rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
 901        }
 902
 903        /* Clear remaining error bits and Port-Write Pending bit */
 904        rio_write_config_32(rdev,
 905                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
 906                        err_status);
 907
 908        return 0;
 909}
 910EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);
 911
 912/**
 913 * rio_mport_get_efb - get pointer to next extended features block
 914 * @port: Master port to issue transaction
 915 * @local: Indicate a local master port or remote device access
 916 * @destid: Destination ID of the device
 917 * @hopcount: Number of switch hops to the device
 918 * @from: Offset of  current Extended Feature block header (if 0 starts
 919 * from ExtFeaturePtr)
 920 */
 921u32
 922rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
 923                      u8 hopcount, u32 from)
 924{
 925        u32 reg_val;
 926
 927        if (from == 0) {
 928                if (local)
 929                        rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
 930                                                 &reg_val);
 931                else
 932                        rio_mport_read_config_32(port, destid, hopcount,
 933                                                 RIO_ASM_INFO_CAR, &reg_val);
 934                return reg_val & RIO_EXT_FTR_PTR_MASK;
 935        } else {
 936                if (local)
 937                        rio_local_read_config_32(port, from, &reg_val);
 938                else
 939                        rio_mport_read_config_32(port, destid, hopcount,
 940                                                 from, &reg_val);
 941                return RIO_GET_BLOCK_ID(reg_val);
 942        }
 943}
 944
 945/**
 946 * rio_mport_get_feature - query for devices' extended features
 947 * @port: Master port to issue transaction
 948 * @local: Indicate a local master port or remote device access
 949 * @destid: Destination ID of the device
 950 * @hopcount: Number of switch hops to the device
 951 * @ftr: Extended feature code
 952 *
 953 * Tell if a device supports a given RapidIO capability.
 954 * Returns the offset of the requested extended feature
 955 * block within the device's RIO configuration space or
 956 * 0 in case the device does not support it.  Possible
 957 * values for @ftr:
 958 *
 959 * %RIO_EFB_PAR_EP_ID           LP/LVDS EP Devices
 960 *
 961 * %RIO_EFB_PAR_EP_REC_ID       LP/LVDS EP Recovery Devices
 962 *
 963 * %RIO_EFB_PAR_EP_FREE_ID      LP/LVDS EP Free Devices
 964 *
 965 * %RIO_EFB_SER_EP_ID           LP/Serial EP Devices
 966 *
 967 * %RIO_EFB_SER_EP_REC_ID       LP/Serial EP Recovery Devices
 968 *
 969 * %RIO_EFB_SER_EP_FREE_ID      LP/Serial EP Free Devices
 970 */
 971u32
 972rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
 973                      u8 hopcount, int ftr)
 974{
 975        u32 asm_info, ext_ftr_ptr, ftr_header;
 976
 977        if (local)
 978                rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
 979        else
 980                rio_mport_read_config_32(port, destid, hopcount,
 981                                         RIO_ASM_INFO_CAR, &asm_info);
 982
 983        ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
 984
 985        while (ext_ftr_ptr) {
 986                if (local)
 987                        rio_local_read_config_32(port, ext_ftr_ptr,
 988                                                 &ftr_header);
 989                else
 990                        rio_mport_read_config_32(port, destid, hopcount,
 991                                                 ext_ftr_ptr, &ftr_header);
 992                if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
 993                        return ext_ftr_ptr;
 994                if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
 995                        break;
 996        }
 997
 998        return 0;
 999}
1000
1001/**
1002 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
1003 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1004 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1005 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
1006 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
1007 * @from: Previous RIO device found in search, or %NULL for new search
1008 *
1009 * Iterates through the list of known RIO devices. If a RIO device is
1010 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
1011 * count to the device is incrememted and a pointer to its device
1012 * structure is returned. Otherwise, %NULL is returned. A new search
1013 * is initiated by passing %NULL to the @from argument. Otherwise, if
1014 * @from is not %NULL, searches continue from next device on the global
1015 * list. The reference count for @from is always decremented if it is
1016 * not %NULL.
1017 */
1018struct rio_dev *rio_get_asm(u16 vid, u16 did,
1019                            u16 asm_vid, u16 asm_did, struct rio_dev *from)
1020{
1021        struct list_head *n;
1022        struct rio_dev *rdev;
1023
1024        WARN_ON(in_interrupt());
1025        spin_lock(&rio_global_list_lock);
1026        n = from ? from->global_list.next : rio_devices.next;
1027
1028        while (n && (n != &rio_devices)) {
1029                rdev = rio_dev_g(n);
1030                if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
1031                    (did == RIO_ANY_ID || rdev->did == did) &&
1032                    (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
1033                    (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
1034                        goto exit;
1035                n = n->next;
1036        }
1037        rdev = NULL;
1038      exit:
1039        rio_dev_put(from);
1040        rdev = rio_dev_get(rdev);
1041        spin_unlock(&rio_global_list_lock);
1042        return rdev;
1043}
1044
1045/**
1046 * rio_get_device - Begin or continue searching for a RIO device by vid/did
1047 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1048 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1049 * @from: Previous RIO device found in search, or %NULL for new search
1050 *
1051 * Iterates through the list of known RIO devices. If a RIO device is
1052 * found with a matching @vid and @did, the reference count to the
1053 * device is incrememted and a pointer to its device structure is returned.
1054 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
1055 * to the @from argument. Otherwise, if @from is not %NULL, searches
1056 * continue from next device on the global list. The reference count for
1057 * @from is always decremented if it is not %NULL.
1058 */
1059struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
1060{
1061        return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
1062}
1063
1064/**
1065 * rio_std_route_add_entry - Add switch route table entry using standard
1066 *   registers defined in RIO specification rev.1.3
1067 * @mport: Master port to issue transaction
1068 * @destid: Destination ID of the device
1069 * @hopcount: Number of switch hops to the device
1070 * @table: routing table ID (global or port-specific)
1071 * @route_destid: destID entry in the RT
1072 * @route_port: destination port for specified destID
1073 */
1074int rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1075                       u16 table, u16 route_destid, u8 route_port)
1076{
1077        if (table == RIO_GLOBAL_TABLE) {
1078                rio_mport_write_config_32(mport, destid, hopcount,
1079                                RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1080                                (u32)route_destid);
1081                rio_mport_write_config_32(mport, destid, hopcount,
1082                                RIO_STD_RTE_CONF_PORT_SEL_CSR,
1083                                (u32)route_port);
1084        }
1085
1086        udelay(10);
1087        return 0;
1088}
1089
1090/**
1091 * rio_std_route_get_entry - Read switch route table entry (port number)
1092 *   associated with specified destID using standard registers defined in RIO
1093 *   specification rev.1.3
1094 * @mport: Master port to issue transaction
1095 * @destid: Destination ID of the device
1096 * @hopcount: Number of switch hops to the device
1097 * @table: routing table ID (global or port-specific)
1098 * @route_destid: destID entry in the RT
1099 * @route_port: returned destination port for specified destID
1100 */
1101int rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1102                       u16 table, u16 route_destid, u8 *route_port)
1103{
1104        u32 result;
1105
1106        if (table == RIO_GLOBAL_TABLE) {
1107                rio_mport_write_config_32(mport, destid, hopcount,
1108                                RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
1109                rio_mport_read_config_32(mport, destid, hopcount,
1110                                RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);
1111
1112                *route_port = (u8)result;
1113        }
1114
1115        return 0;
1116}
1117
1118/**
1119 * rio_std_route_clr_table - Clear swotch route table using standard registers
1120 *   defined in RIO specification rev.1.3.
1121 * @mport: Master port to issue transaction
1122 * @destid: Destination ID of the device
1123 * @hopcount: Number of switch hops to the device
1124 * @table: routing table ID (global or port-specific)
1125 */
1126int rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
1127                       u16 table)
1128{
1129        u32 max_destid = 0xff;
1130        u32 i, pef, id_inc = 1, ext_cfg = 0;
1131        u32 port_sel = RIO_INVALID_ROUTE;
1132
1133        if (table == RIO_GLOBAL_TABLE) {
1134                rio_mport_read_config_32(mport, destid, hopcount,
1135                                         RIO_PEF_CAR, &pef);
1136
1137                if (mport->sys_size) {
1138                        rio_mport_read_config_32(mport, destid, hopcount,
1139                                                 RIO_SWITCH_RT_LIMIT,
1140                                                 &max_destid);
1141                        max_destid &= RIO_RT_MAX_DESTID;
1142                }
1143
1144                if (pef & RIO_PEF_EXT_RT) {
1145                        ext_cfg = 0x80000000;
1146                        id_inc = 4;
1147                        port_sel = (RIO_INVALID_ROUTE << 24) |
1148                                   (RIO_INVALID_ROUTE << 16) |
1149                                   (RIO_INVALID_ROUTE << 8) |
1150                                   RIO_INVALID_ROUTE;
1151                }
1152
1153                for (i = 0; i <= max_destid;) {
1154                        rio_mport_write_config_32(mport, destid, hopcount,
1155                                        RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1156                                        ext_cfg | i);
1157                        rio_mport_write_config_32(mport, destid, hopcount,
1158                                        RIO_STD_RTE_CONF_PORT_SEL_CSR,
1159                                        port_sel);
1160                        i += id_inc;
1161                }
1162        }
1163
1164        udelay(10);
1165        return 0;
1166}
1167
1168#ifdef CONFIG_RAPIDIO_DMA_ENGINE
1169
1170static bool rio_chan_filter(struct dma_chan *chan, void *arg)
1171{
1172        struct rio_dev *rdev = arg;
1173
1174        /* Check that DMA device belongs to the right MPORT */
1175        return (rdev->net->hport ==
1176                container_of(chan->device, struct rio_mport, dma));
1177}
1178
1179/**
1180 * rio_request_dma - request RapidIO capable DMA channel that supports
1181 *   specified target RapidIO device.
1182 * @rdev: RIO device control structure
1183 *
1184 * Returns pointer to allocated DMA channel or NULL if failed.
1185 */
1186struct dma_chan *rio_request_dma(struct rio_dev *rdev)
1187{
1188        dma_cap_mask_t mask;
1189        struct dma_chan *dchan;
1190
1191        dma_cap_zero(mask);
1192        dma_cap_set(DMA_SLAVE, mask);
1193        dchan = dma_request_channel(mask, rio_chan_filter, rdev);
1194
1195        return dchan;
1196}
1197EXPORT_SYMBOL_GPL(rio_request_dma);
1198
1199/**
1200 * rio_release_dma - release specified DMA channel
1201 * @dchan: DMA channel to release
1202 */
1203void rio_release_dma(struct dma_chan *dchan)
1204{
1205        dma_release_channel(dchan);
1206}
1207EXPORT_SYMBOL_GPL(rio_release_dma);
1208
1209/**
1210 * rio_dma_prep_slave_sg - RapidIO specific wrapper
1211 *   for device_prep_slave_sg callback defined by DMAENGINE.
1212 * @rdev: RIO device control structure
1213 * @dchan: DMA channel to configure
1214 * @data: RIO specific data descriptor
1215 * @direction: DMA data transfer direction (TO or FROM the device)
1216 * @flags: dmaengine defined flags
1217 *
1218 * Initializes RapidIO capable DMA channel for the specified data transfer.
1219 * Uses DMA channel private extension to pass information related to remote
1220 * target RIO device.
1221 * Returns pointer to DMA transaction descriptor or NULL if failed.
1222 */
1223struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
1224        struct dma_chan *dchan, struct rio_dma_data *data,
1225        enum dma_transfer_direction direction, unsigned long flags)
1226{
1227        struct dma_async_tx_descriptor *txd = NULL;
1228        struct rio_dma_ext rio_ext;
1229
1230        if (dchan->device->device_prep_slave_sg == NULL) {
1231                pr_err("%s: prep_rio_sg == NULL\n", __func__);
1232                return NULL;
1233        }
1234
1235        rio_ext.destid = rdev->destid;
1236        rio_ext.rio_addr_u = data->rio_addr_u;
1237        rio_ext.rio_addr = data->rio_addr;
1238        rio_ext.wr_type = data->wr_type;
1239
1240        txd = dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
1241                                        direction, flags, &rio_ext);
1242
1243        return txd;
1244}
1245EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
1246
1247#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1248
1249static void rio_fixup_device(struct rio_dev *dev)
1250{
1251}
1252
1253static int __devinit rio_init(void)
1254{
1255        struct rio_dev *dev = NULL;
1256
1257        while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
1258                rio_fixup_device(dev);
1259        }
1260        return 0;
1261}
1262
1263static struct workqueue_struct *rio_wq;
1264
1265struct rio_disc_work {
1266        struct work_struct      work;
1267        struct rio_mport        *mport;
1268};
1269
1270static void __devinit disc_work_handler(struct work_struct *_work)
1271{
1272        struct rio_disc_work *work;
1273
1274        work = container_of(_work, struct rio_disc_work, work);
1275        pr_debug("RIO: discovery work for mport %d %s\n",
1276                 work->mport->id, work->mport->name);
1277        rio_disc_mport(work->mport);
1278}
1279
1280int __devinit rio_init_mports(void)
1281{
1282        struct rio_mport *port;
1283        struct rio_disc_work *work;
1284        int n = 0;
1285
1286        if (!next_portid)
1287                return -ENODEV;
1288
1289        /*
1290         * First, run enumerations and check if we need to perform discovery
1291         * on any of the registered mports.
1292         */
1293        list_for_each_entry(port, &rio_mports, node) {
1294                if (port->host_deviceid >= 0)
1295                        rio_enum_mport(port);
1296                else
1297                        n++;
1298        }
1299
1300        if (!n)
1301                goto no_disc;
1302
1303        /*
1304         * If we have mports that require discovery schedule a discovery work
1305         * for each of them. If the code below fails to allocate needed
1306         * resources, exit without error to keep results of enumeration
1307         * process (if any).
1308         * TODO: Implement restart of dicovery process for all or
1309         * individual discovering mports.
1310         */
1311        rio_wq = alloc_workqueue("riodisc", 0, 0);
1312        if (!rio_wq) {
1313                pr_err("RIO: unable allocate rio_wq\n");
1314                goto no_disc;
1315        }
1316
1317        work = kcalloc(n, sizeof *work, GFP_KERNEL);
1318        if (!work) {
1319                pr_err("RIO: no memory for work struct\n");
1320                destroy_workqueue(rio_wq);
1321                goto no_disc;
1322        }
1323
1324        n = 0;
1325        list_for_each_entry(port, &rio_mports, node) {
1326                if (port->host_deviceid < 0) {
1327                        work[n].mport = port;
1328                        INIT_WORK(&work[n].work, disc_work_handler);
1329                        queue_work(rio_wq, &work[n].work);
1330                        n++;
1331                }
1332        }
1333
1334        flush_workqueue(rio_wq);
1335        pr_debug("RIO: destroy discovery workqueue\n");
1336        destroy_workqueue(rio_wq);
1337        kfree(work);
1338
1339no_disc:
1340        rio_init();
1341
1342        return 0;
1343}
1344
1345device_initcall_sync(rio_init_mports);
1346
1347static int hdids[RIO_MAX_MPORTS + 1];
1348
1349static int rio_get_hdid(int index)
1350{
1351        if (!hdids[0] || hdids[0] <= index || index >= RIO_MAX_MPORTS)
1352                return -1;
1353
1354        return hdids[index + 1];
1355}
1356
1357static int rio_hdid_setup(char *str)
1358{
1359        (void)get_options(str, ARRAY_SIZE(hdids), hdids);
1360        return 1;
1361}
1362
1363__setup("riohdid=", rio_hdid_setup);
1364
1365int rio_register_mport(struct rio_mport *port)
1366{
1367        if (next_portid >= RIO_MAX_MPORTS) {
1368                pr_err("RIO: reached specified max number of mports\n");
1369                return 1;
1370        }
1371
1372        port->id = next_portid++;
1373        port->host_deviceid = rio_get_hdid(port->id);
1374        list_add_tail(&port->node, &rio_mports);
1375        return 0;
1376}
1377
1378EXPORT_SYMBOL_GPL(rio_local_get_device_id);
1379EXPORT_SYMBOL_GPL(rio_get_device);
1380EXPORT_SYMBOL_GPL(rio_get_asm);
1381EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
1382EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
1383EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
1384EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
1385EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
1386EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
1387EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
1388EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
1389
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