linux/drivers/rapidio/rio-scan.c
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   1/*
   2 * RapidIO enumeration and discovery support
   3 *
   4 * Copyright 2005 MontaVista Software, Inc.
   5 * Matt Porter <mporter@kernel.crashing.org>
   6 *
   7 * Copyright 2009 Integrated Device Technology, Inc.
   8 * Alex Bounine <alexandre.bounine@idt.com>
   9 * - Added Port-Write/Error Management initialization and handling
  10 *
  11 * Copyright 2009 Sysgo AG
  12 * Thomas Moll <thomas.moll@sysgo.com>
  13 * - Added Input- Output- enable functionality, to allow full communication
  14 *
  15 * This program is free software; you can redistribute  it and/or modify it
  16 * under  the terms of  the GNU General  Public License as published by the
  17 * Free Software Foundation;  either version 2 of the  License, or (at your
  18 * option) any later version.
  19 */
  20
  21#include <linux/types.h>
  22#include <linux/kernel.h>
  23
  24#include <linux/delay.h>
  25#include <linux/dma-mapping.h>
  26#include <linux/init.h>
  27#include <linux/rio.h>
  28#include <linux/rio_drv.h>
  29#include <linux/rio_ids.h>
  30#include <linux/rio_regs.h>
  31#include <linux/module.h>
  32#include <linux/spinlock.h>
  33#include <linux/timer.h>
  34#include <linux/sched.h>
  35#include <linux/jiffies.h>
  36#include <linux/slab.h>
  37
  38#include "rio.h"
  39
  40static void rio_init_em(struct rio_dev *rdev);
  41
  42static int next_destid = 0;
  43static int next_comptag = 1;
  44
  45static int rio_mport_phys_table[] = {
  46        RIO_EFB_PAR_EP_ID,
  47        RIO_EFB_PAR_EP_REC_ID,
  48        RIO_EFB_SER_EP_ID,
  49        RIO_EFB_SER_EP_REC_ID,
  50        -1,
  51};
  52
  53
  54/**
  55 * rio_destid_alloc - Allocate next available destID for given network
  56 * @net: RIO network
  57 *
  58 * Returns next available device destination ID for the specified RIO network.
  59 * Marks allocated ID as one in use.
  60 * Returns RIO_INVALID_DESTID if new destID is not available.
  61 */
  62static u16 rio_destid_alloc(struct rio_net *net)
  63{
  64        int destid;
  65        struct rio_id_table *idtab = &net->destid_table;
  66
  67        spin_lock(&idtab->lock);
  68        destid = find_first_zero_bit(idtab->table, idtab->max);
  69
  70        if (destid < idtab->max) {
  71                set_bit(destid, idtab->table);
  72                destid += idtab->start;
  73        } else
  74                destid = RIO_INVALID_DESTID;
  75
  76        spin_unlock(&idtab->lock);
  77        return (u16)destid;
  78}
  79
  80/**
  81 * rio_destid_reserve - Reserve the specivied destID
  82 * @net: RIO network
  83 * @destid: destID to reserve
  84 *
  85 * Tries to reserve the specified destID.
  86 * Returns 0 if successfull.
  87 */
  88static int rio_destid_reserve(struct rio_net *net, u16 destid)
  89{
  90        int oldbit;
  91        struct rio_id_table *idtab = &net->destid_table;
  92
  93        destid -= idtab->start;
  94        spin_lock(&idtab->lock);
  95        oldbit = test_and_set_bit(destid, idtab->table);
  96        spin_unlock(&idtab->lock);
  97        return oldbit;
  98}
  99
 100/**
 101 * rio_destid_free - free a previously allocated destID
 102 * @net: RIO network
 103 * @destid: destID to free
 104 *
 105 * Makes the specified destID available for use.
 106 */
 107static void rio_destid_free(struct rio_net *net, u16 destid)
 108{
 109        struct rio_id_table *idtab = &net->destid_table;
 110
 111        destid -= idtab->start;
 112        spin_lock(&idtab->lock);
 113        clear_bit(destid, idtab->table);
 114        spin_unlock(&idtab->lock);
 115}
 116
 117/**
 118 * rio_destid_first - return first destID in use
 119 * @net: RIO network
 120 */
 121static u16 rio_destid_first(struct rio_net *net)
 122{
 123        int destid;
 124        struct rio_id_table *idtab = &net->destid_table;
 125
 126        spin_lock(&idtab->lock);
 127        destid = find_first_bit(idtab->table, idtab->max);
 128        if (destid >= idtab->max)
 129                destid = RIO_INVALID_DESTID;
 130        else
 131                destid += idtab->start;
 132        spin_unlock(&idtab->lock);
 133        return (u16)destid;
 134}
 135
 136/**
 137 * rio_destid_next - return next destID in use
 138 * @net: RIO network
 139 * @from: destination ID from which search shall continue
 140 */
 141static u16 rio_destid_next(struct rio_net *net, u16 from)
 142{
 143        int destid;
 144        struct rio_id_table *idtab = &net->destid_table;
 145
 146        spin_lock(&idtab->lock);
 147        destid = find_next_bit(idtab->table, idtab->max, from);
 148        if (destid >= idtab->max)
 149                destid = RIO_INVALID_DESTID;
 150        else
 151                destid += idtab->start;
 152        spin_unlock(&idtab->lock);
 153        return (u16)destid;
 154}
 155
 156/**
 157 * rio_get_device_id - Get the base/extended device id for a device
 158 * @port: RIO master port
 159 * @destid: Destination ID of device
 160 * @hopcount: Hopcount to device
 161 *
 162 * Reads the base/extended device id from a device. Returns the
 163 * 8/16-bit device ID.
 164 */
 165static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
 166{
 167        u32 result;
 168
 169        rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
 170
 171        return RIO_GET_DID(port->sys_size, result);
 172}
 173
 174/**
 175 * rio_set_device_id - Set the base/extended device id for a device
 176 * @port: RIO master port
 177 * @destid: Destination ID of device
 178 * @hopcount: Hopcount to device
 179 * @did: Device ID value to be written
 180 *
 181 * Writes the base/extended device id from a device.
 182 */
 183static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
 184{
 185        rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
 186                                  RIO_SET_DID(port->sys_size, did));
 187}
 188
 189/**
 190 * rio_local_set_device_id - Set the base/extended device id for a port
 191 * @port: RIO master port
 192 * @did: Device ID value to be written
 193 *
 194 * Writes the base/extended device id from a device.
 195 */
 196static void rio_local_set_device_id(struct rio_mport *port, u16 did)
 197{
 198        rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
 199                                did));
 200}
 201
 202/**
 203 * rio_clear_locks- Release all host locks and signal enumeration complete
 204 * @net: RIO network to run on
 205 *
 206 * Marks the component tag CSR on each device with the enumeration
 207 * complete flag. When complete, it then release the host locks on
 208 * each device. Returns 0 on success or %-EINVAL on failure.
 209 */
 210static int rio_clear_locks(struct rio_net *net)
 211{
 212        struct rio_mport *port = net->hport;
 213        struct rio_dev *rdev;
 214        u32 result;
 215        int ret = 0;
 216
 217        /* Release host device id locks */
 218        rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 219                                  port->host_deviceid);
 220        rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 221        if ((result & 0xffff) != 0xffff) {
 222                printk(KERN_INFO
 223                       "RIO: badness when releasing host lock on master port, result %8.8x\n",
 224                       result);
 225                ret = -EINVAL;
 226        }
 227        list_for_each_entry(rdev, &net->devices, net_list) {
 228                rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
 229                                    port->host_deviceid);
 230                rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
 231                if ((result & 0xffff) != 0xffff) {
 232                        printk(KERN_INFO
 233                               "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
 234                               rdev->vid, rdev->did);
 235                        ret = -EINVAL;
 236                }
 237
 238                /* Mark device as discovered and enable master */
 239                rio_read_config_32(rdev,
 240                                   rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 241                                   &result);
 242                result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
 243                rio_write_config_32(rdev,
 244                                    rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 245                                    result);
 246        }
 247
 248        return ret;
 249}
 250
 251/**
 252 * rio_enum_host- Set host lock and initialize host destination ID
 253 * @port: Master port to issue transaction
 254 *
 255 * Sets the local host master port lock and destination ID register
 256 * with the host device ID value. The host device ID value is provided
 257 * by the platform. Returns %0 on success or %-1 on failure.
 258 */
 259static int rio_enum_host(struct rio_mport *port)
 260{
 261        u32 result;
 262
 263        /* Set master port host device id lock */
 264        rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 265                                  port->host_deviceid);
 266
 267        rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 268        if ((result & 0xffff) != port->host_deviceid)
 269                return -1;
 270
 271        /* Set master port destid and init destid ctr */
 272        rio_local_set_device_id(port, port->host_deviceid);
 273        return 0;
 274}
 275
 276/**
 277 * rio_device_has_destid- Test if a device contains a destination ID register
 278 * @port: Master port to issue transaction
 279 * @src_ops: RIO device source operations
 280 * @dst_ops: RIO device destination operations
 281 *
 282 * Checks the provided @src_ops and @dst_ops for the necessary transaction
 283 * capabilities that indicate whether or not a device will implement a
 284 * destination ID register. Returns 1 if true or 0 if false.
 285 */
 286static int rio_device_has_destid(struct rio_mport *port, int src_ops,
 287                                 int dst_ops)
 288{
 289        u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
 290
 291        return !!((src_ops | dst_ops) & mask);
 292}
 293
 294/**
 295 * rio_release_dev- Frees a RIO device struct
 296 * @dev: LDM device associated with a RIO device struct
 297 *
 298 * Gets the RIO device struct associated a RIO device struct.
 299 * The RIO device struct is freed.
 300 */
 301static void rio_release_dev(struct device *dev)
 302{
 303        struct rio_dev *rdev;
 304
 305        rdev = to_rio_dev(dev);
 306        kfree(rdev);
 307}
 308
 309/**
 310 * rio_is_switch- Tests if a RIO device has switch capabilities
 311 * @rdev: RIO device
 312 *
 313 * Gets the RIO device Processing Element Features register
 314 * contents and tests for switch capabilities. Returns 1 if
 315 * the device is a switch or 0 if it is not a switch.
 316 * The RIO device struct is freed.
 317 */
 318static int rio_is_switch(struct rio_dev *rdev)
 319{
 320        if (rdev->pef & RIO_PEF_SWITCH)
 321                return 1;
 322        return 0;
 323}
 324
 325/**
 326 * rio_setup_device- Allocates and sets up a RIO device
 327 * @net: RIO network
 328 * @port: Master port to send transactions
 329 * @destid: Current destination ID
 330 * @hopcount: Current hopcount
 331 * @do_enum: Enumeration/Discovery mode flag
 332 *
 333 * Allocates a RIO device and configures fields based on configuration
 334 * space contents. If device has a destination ID register, a destination
 335 * ID is either assigned in enumeration mode or read from configuration
 336 * space in discovery mode.  If the device has switch capabilities, then
 337 * a switch is allocated and configured appropriately. Returns a pointer
 338 * to a RIO device on success or NULL on failure.
 339 *
 340 */
 341static struct rio_dev *rio_setup_device(struct rio_net *net,
 342                                        struct rio_mport *port, u16 destid,
 343                                        u8 hopcount, int do_enum)
 344{
 345        int ret = 0;
 346        struct rio_dev *rdev;
 347        struct rio_switch *rswitch = NULL;
 348        int result, rdid;
 349        size_t size;
 350        u32 swpinfo = 0;
 351
 352        size = sizeof(struct rio_dev);
 353        if (rio_mport_read_config_32(port, destid, hopcount,
 354                                     RIO_PEF_CAR, &result))
 355                return NULL;
 356
 357        if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
 358                rio_mport_read_config_32(port, destid, hopcount,
 359                                         RIO_SWP_INFO_CAR, &swpinfo);
 360                if (result & RIO_PEF_SWITCH) {
 361                        size += (RIO_GET_TOTAL_PORTS(swpinfo) *
 362                                sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
 363                }
 364        }
 365
 366        rdev = kzalloc(size, GFP_KERNEL);
 367        if (!rdev)
 368                return NULL;
 369
 370        rdev->net = net;
 371        rdev->pef = result;
 372        rdev->swpinfo = swpinfo;
 373        rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
 374                                 &result);
 375        rdev->did = result >> 16;
 376        rdev->vid = result & 0xffff;
 377        rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
 378                                 &rdev->device_rev);
 379        rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
 380                                 &result);
 381        rdev->asm_did = result >> 16;
 382        rdev->asm_vid = result & 0xffff;
 383        rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
 384                                 &result);
 385        rdev->asm_rev = result >> 16;
 386        if (rdev->pef & RIO_PEF_EXT_FEATURES) {
 387                rdev->efptr = result & 0xffff;
 388                rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
 389                                                         hopcount);
 390
 391                rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
 392                                                hopcount, RIO_EFB_ERR_MGMNT);
 393        }
 394
 395        rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
 396                                 &rdev->src_ops);
 397        rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
 398                                 &rdev->dst_ops);
 399
 400        if (do_enum) {
 401                /* Assign component tag to device */
 402                if (next_comptag >= 0x10000) {
 403                        pr_err("RIO: Component Tag Counter Overflow\n");
 404                        goto cleanup;
 405                }
 406                rio_mport_write_config_32(port, destid, hopcount,
 407                                          RIO_COMPONENT_TAG_CSR, next_comptag);
 408                rdev->comp_tag = next_comptag++;
 409        }  else {
 410                rio_mport_read_config_32(port, destid, hopcount,
 411                                         RIO_COMPONENT_TAG_CSR,
 412                                         &rdev->comp_tag);
 413        }
 414
 415        if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
 416                if (do_enum) {
 417                        rio_set_device_id(port, destid, hopcount, next_destid);
 418                        rdev->destid = next_destid;
 419                        next_destid = rio_destid_alloc(net);
 420                } else
 421                        rdev->destid = rio_get_device_id(port, destid, hopcount);
 422
 423                rdev->hopcount = 0xff;
 424        } else {
 425                /* Switch device has an associated destID which
 426                 * will be adjusted later
 427                 */
 428                rdev->destid = destid;
 429                rdev->hopcount = hopcount;
 430        }
 431
 432        /* If a PE has both switch and other functions, show it as a switch */
 433        if (rio_is_switch(rdev)) {
 434                rswitch = rdev->rswitch;
 435                rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID;
 436                rswitch->port_ok = 0;
 437                rswitch->route_table = kzalloc(sizeof(u8)*
 438                                        RIO_MAX_ROUTE_ENTRIES(port->sys_size),
 439                                        GFP_KERNEL);
 440                if (!rswitch->route_table)
 441                        goto cleanup;
 442                /* Initialize switch route table */
 443                for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
 444                                rdid++)
 445                        rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
 446                dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
 447                             rswitch->switchid);
 448                rio_switch_init(rdev, do_enum);
 449
 450                if (do_enum && rswitch->clr_table)
 451                        rswitch->clr_table(port, destid, hopcount,
 452                                           RIO_GLOBAL_TABLE);
 453
 454                list_add_tail(&rswitch->node, &net->switches);
 455
 456        } else {
 457                if (do_enum)
 458                        /*Enable Input Output Port (transmitter reviever)*/
 459                        rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
 460
 461                dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
 462                             rdev->destid);
 463        }
 464
 465        rio_attach_device(rdev);
 466
 467        device_initialize(&rdev->dev);
 468        rdev->dev.release = rio_release_dev;
 469        rio_dev_get(rdev);
 470
 471        rdev->dma_mask = DMA_BIT_MASK(32);
 472        rdev->dev.dma_mask = &rdev->dma_mask;
 473        rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 474
 475        if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
 476                rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 477                                   0, 0xffff);
 478
 479        ret = rio_add_device(rdev);
 480        if (ret)
 481                goto cleanup;
 482
 483        return rdev;
 484
 485cleanup:
 486        if (rswitch)
 487                kfree(rswitch->route_table);
 488
 489        kfree(rdev);
 490        return NULL;
 491}
 492
 493/**
 494 * rio_sport_is_active- Tests if a switch port has an active connection.
 495 * @port: Master port to send transaction
 496 * @destid: Associated destination ID for switch
 497 * @hopcount: Hopcount to reach switch
 498 * @sport: Switch port number
 499 *
 500 * Reads the port error status CSR for a particular switch port to
 501 * determine if the port has an active link.  Returns
 502 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
 503 * inactive.
 504 */
 505static int
 506rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
 507{
 508        u32 result = 0;
 509        u32 ext_ftr_ptr;
 510
 511        ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
 512
 513        while (ext_ftr_ptr) {
 514                rio_mport_read_config_32(port, destid, hopcount,
 515                                         ext_ftr_ptr, &result);
 516                result = RIO_GET_BLOCK_ID(result);
 517                if ((result == RIO_EFB_SER_EP_FREE_ID) ||
 518                    (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
 519                    (result == RIO_EFB_SER_EP_FREC_ID))
 520                        break;
 521
 522                ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
 523                                                ext_ftr_ptr);
 524        }
 525
 526        if (ext_ftr_ptr)
 527                rio_mport_read_config_32(port, destid, hopcount,
 528                                         ext_ftr_ptr +
 529                                         RIO_PORT_N_ERR_STS_CSR(sport),
 530                                         &result);
 531
 532        return result & RIO_PORT_N_ERR_STS_PORT_OK;
 533}
 534
 535/**
 536 * rio_lock_device - Acquires host device lock for specified device
 537 * @port: Master port to send transaction
 538 * @destid: Destination ID for device/switch
 539 * @hopcount: Hopcount to reach switch
 540 * @wait_ms: Max wait time in msec (0 = no timeout)
 541 *
 542 * Attepts to acquire host device lock for specified device
 543 * Returns 0 if device lock acquired or EINVAL if timeout expires.
 544 */
 545static int
 546rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
 547{
 548        u32 result;
 549        int tcnt = 0;
 550
 551        /* Attempt to acquire device lock */
 552        rio_mport_write_config_32(port, destid, hopcount,
 553                                  RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 554        rio_mport_read_config_32(port, destid, hopcount,
 555                                 RIO_HOST_DID_LOCK_CSR, &result);
 556
 557        while (result != port->host_deviceid) {
 558                if (wait_ms != 0 && tcnt == wait_ms) {
 559                        pr_debug("RIO: timeout when locking device %x:%x\n",
 560                                destid, hopcount);
 561                        return -EINVAL;
 562                }
 563
 564                /* Delay a bit */
 565                mdelay(1);
 566                tcnt++;
 567                /* Try to acquire device lock again */
 568                rio_mport_write_config_32(port, destid,
 569                        hopcount,
 570                        RIO_HOST_DID_LOCK_CSR,
 571                        port->host_deviceid);
 572                rio_mport_read_config_32(port, destid,
 573                        hopcount,
 574                        RIO_HOST_DID_LOCK_CSR, &result);
 575        }
 576
 577        return 0;
 578}
 579
 580/**
 581 * rio_unlock_device - Releases host device lock for specified device
 582 * @port: Master port to send transaction
 583 * @destid: Destination ID for device/switch
 584 * @hopcount: Hopcount to reach switch
 585 *
 586 * Returns 0 if device lock released or EINVAL if fails.
 587 */
 588static int
 589rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
 590{
 591        u32 result;
 592
 593        /* Release device lock */
 594        rio_mport_write_config_32(port, destid,
 595                                  hopcount,
 596                                  RIO_HOST_DID_LOCK_CSR,
 597                                  port->host_deviceid);
 598        rio_mport_read_config_32(port, destid, hopcount,
 599                RIO_HOST_DID_LOCK_CSR, &result);
 600        if ((result & 0xffff) != 0xffff) {
 601                pr_debug("RIO: badness when releasing device lock %x:%x\n",
 602                         destid, hopcount);
 603                return -EINVAL;
 604        }
 605
 606        return 0;
 607}
 608
 609/**
 610 * rio_route_add_entry- Add a route entry to a switch routing table
 611 * @rdev: RIO device
 612 * @table: Routing table ID
 613 * @route_destid: Destination ID to be routed
 614 * @route_port: Port number to be routed
 615 * @lock: lock switch device flag
 616 *
 617 * Calls the switch specific add_entry() method to add a route entry
 618 * on a switch. The route table can be specified using the @table
 619 * argument if a switch has per port routing tables or the normal
 620 * use is to specific all tables (or the global table) by passing
 621 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 622 * on failure.
 623 */
 624static int
 625rio_route_add_entry(struct rio_dev *rdev,
 626                    u16 table, u16 route_destid, u8 route_port, int lock)
 627{
 628        int rc;
 629
 630        if (lock) {
 631                rc = rio_lock_device(rdev->net->hport, rdev->destid,
 632                                     rdev->hopcount, 1000);
 633                if (rc)
 634                        return rc;
 635        }
 636
 637        rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
 638                                      rdev->hopcount, table,
 639                                      route_destid, route_port);
 640        if (lock)
 641                rio_unlock_device(rdev->net->hport, rdev->destid,
 642                                  rdev->hopcount);
 643
 644        return rc;
 645}
 646
 647/**
 648 * rio_route_get_entry- Read a route entry in a switch routing table
 649 * @rdev: RIO device
 650 * @table: Routing table ID
 651 * @route_destid: Destination ID to be routed
 652 * @route_port: Pointer to read port number into
 653 * @lock: lock switch device flag
 654 *
 655 * Calls the switch specific get_entry() method to read a route entry
 656 * in a switch. The route table can be specified using the @table
 657 * argument if a switch has per port routing tables or the normal
 658 * use is to specific all tables (or the global table) by passing
 659 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 660 * on failure.
 661 */
 662static int
 663rio_route_get_entry(struct rio_dev *rdev, u16 table,
 664                    u16 route_destid, u8 *route_port, int lock)
 665{
 666        int rc;
 667
 668        if (lock) {
 669                rc = rio_lock_device(rdev->net->hport, rdev->destid,
 670                                     rdev->hopcount, 1000);
 671                if (rc)
 672                        return rc;
 673        }
 674
 675        rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
 676                                      rdev->hopcount, table,
 677                                      route_destid, route_port);
 678        if (lock)
 679                rio_unlock_device(rdev->net->hport, rdev->destid,
 680                                  rdev->hopcount);
 681
 682        return rc;
 683}
 684
 685/**
 686 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
 687 * @port: Master port to send transaction
 688 * @hopcount: Number of hops to the device
 689 *
 690 * Used during enumeration to read the Host Device ID Lock CSR on a
 691 * RIO device. Returns the value of the lock register.
 692 */
 693static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
 694{
 695        u32 result;
 696
 697        rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
 698                                 RIO_HOST_DID_LOCK_CSR, &result);
 699
 700        return (u16) (result & 0xffff);
 701}
 702
 703/**
 704 * rio_enum_peer- Recursively enumerate a RIO network through a master port
 705 * @net: RIO network being enumerated
 706 * @port: Master port to send transactions
 707 * @hopcount: Number of hops into the network
 708 * @prev: Previous RIO device connected to the enumerated one
 709 * @prev_port: Port on previous RIO device
 710 *
 711 * Recursively enumerates a RIO network.  Transactions are sent via the
 712 * master port passed in @port.
 713 */
 714static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 715                         u8 hopcount, struct rio_dev *prev, int prev_port)
 716{
 717        struct rio_dev *rdev;
 718        u32 regval;
 719        int tmp;
 720
 721        if (rio_mport_chk_dev_access(port,
 722                        RIO_ANY_DESTID(port->sys_size), hopcount)) {
 723                pr_debug("RIO: device access check failed\n");
 724                return -1;
 725        }
 726
 727        if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 728                pr_debug("RIO: PE already discovered by this host\n");
 729                /*
 730                 * Already discovered by this host. Add it as another
 731                 * link to the existing device.
 732                 */
 733                rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
 734                                hopcount, RIO_COMPONENT_TAG_CSR, &regval);
 735
 736                if (regval) {
 737                        rdev = rio_get_comptag((regval & 0xffff), NULL);
 738
 739                        if (rdev && prev && rio_is_switch(prev)) {
 740                                pr_debug("RIO: redundant path to %s\n",
 741                                         rio_name(rdev));
 742                                prev->rswitch->nextdev[prev_port] = rdev;
 743                        }
 744                }
 745
 746                return 0;
 747        }
 748
 749        /* Attempt to acquire device lock */
 750        rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 751                                  hopcount,
 752                                  RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 753        while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
 754               < port->host_deviceid) {
 755                /* Delay a bit */
 756                mdelay(1);
 757                /* Attempt to acquire device lock again */
 758                rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 759                                          hopcount,
 760                                          RIO_HOST_DID_LOCK_CSR,
 761                                          port->host_deviceid);
 762        }
 763
 764        if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
 765                pr_debug(
 766                    "RIO: PE locked by a higher priority host...retreating\n");
 767                return -1;
 768        }
 769
 770        /* Setup new RIO device */
 771        rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
 772                                        hopcount, 1);
 773        if (rdev) {
 774                /* Add device to the global and bus/net specific list. */
 775                list_add_tail(&rdev->net_list, &net->devices);
 776                rdev->prev = prev;
 777                if (prev && rio_is_switch(prev))
 778                        prev->rswitch->nextdev[prev_port] = rdev;
 779        } else
 780                return -1;
 781
 782        if (rio_is_switch(rdev)) {
 783                int sw_destid;
 784                int cur_destid;
 785                int sw_inport;
 786                u16 destid;
 787                int port_num;
 788
 789                sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
 790                rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 791                                    port->host_deviceid, sw_inport, 0);
 792                rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
 793
 794                destid = rio_destid_first(net);
 795                while (destid != RIO_INVALID_DESTID && destid < next_destid) {
 796                        if (destid != port->host_deviceid) {
 797                                rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 798                                                    destid, sw_inport, 0);
 799                                rdev->rswitch->route_table[destid] = sw_inport;
 800                        }
 801                        destid = rio_destid_next(net, destid + 1);
 802                }
 803                pr_debug(
 804                    "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 805                    rio_name(rdev), rdev->vid, rdev->did,
 806                    RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 807                sw_destid = next_destid;
 808                for (port_num = 0;
 809                     port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 810                     port_num++) {
 811                        if (sw_inport == port_num) {
 812                                rio_enable_rx_tx_port(port, 0,
 813                                              RIO_ANY_DESTID(port->sys_size),
 814                                              hopcount, port_num);
 815                                rdev->rswitch->port_ok |= (1 << port_num);
 816                                continue;
 817                        }
 818
 819                        cur_destid = next_destid;
 820
 821                        if (rio_sport_is_active
 822                            (port, RIO_ANY_DESTID(port->sys_size), hopcount,
 823                             port_num)) {
 824                                pr_debug(
 825                                    "RIO: scanning device on port %d\n",
 826                                    port_num);
 827                                rio_enable_rx_tx_port(port, 0,
 828                                              RIO_ANY_DESTID(port->sys_size),
 829                                              hopcount, port_num);
 830                                rdev->rswitch->port_ok |= (1 << port_num);
 831                                rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 832                                                RIO_ANY_DESTID(port->sys_size),
 833                                                port_num, 0);
 834
 835                                if (rio_enum_peer(net, port, hopcount + 1,
 836                                                  rdev, port_num) < 0)
 837                                        return -1;
 838
 839                                /* Update routing tables */
 840                                destid = rio_destid_next(net, cur_destid + 1);
 841                                if (destid != RIO_INVALID_DESTID) {
 842                                        for (destid = cur_destid;
 843                                             destid < next_destid;) {
 844                                                if (destid != port->host_deviceid) {
 845                                                        rio_route_add_entry(rdev,
 846                                                                    RIO_GLOBAL_TABLE,
 847                                                                    destid,
 848                                                                    port_num,
 849                                                                    0);
 850                                                        rdev->rswitch->
 851                                                                route_table[destid] =
 852                                                                port_num;
 853                                                }
 854                                                destid = rio_destid_next(net,
 855                                                                destid + 1);
 856                                        }
 857                                }
 858                        } else {
 859                                /* If switch supports Error Management,
 860                                 * set PORT_LOCKOUT bit for unused port
 861                                 */
 862                                if (rdev->em_efptr)
 863                                        rio_set_port_lockout(rdev, port_num, 1);
 864
 865                                rdev->rswitch->port_ok &= ~(1 << port_num);
 866                        }
 867                }
 868
 869                /* Direct Port-write messages to the enumeratiing host */
 870                if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
 871                    (rdev->em_efptr)) {
 872                        rio_write_config_32(rdev,
 873                                        rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
 874                                        (port->host_deviceid << 16) |
 875                                        (port->sys_size << 15));
 876                }
 877
 878                rio_init_em(rdev);
 879
 880                /* Check for empty switch */
 881                if (next_destid == sw_destid)
 882                        next_destid = rio_destid_alloc(net);
 883
 884                rdev->destid = sw_destid;
 885        } else
 886                pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 887                    rio_name(rdev), rdev->vid, rdev->did);
 888
 889        return 0;
 890}
 891
 892/**
 893 * rio_enum_complete- Tests if enumeration of a network is complete
 894 * @port: Master port to send transaction
 895 *
 896 * Tests the PGCCSR discovered bit for non-zero value (enumeration
 897 * complete flag). Return %1 if enumeration is complete or %0 if
 898 * enumeration is incomplete.
 899 */
 900static int rio_enum_complete(struct rio_mport *port)
 901{
 902        u32 regval;
 903
 904        rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 905                                 &regval);
 906        return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
 907}
 908
 909/**
 910 * rio_disc_peer- Recursively discovers a RIO network through a master port
 911 * @net: RIO network being discovered
 912 * @port: Master port to send transactions
 913 * @destid: Current destination ID in network
 914 * @hopcount: Number of hops into the network
 915 * @prev: previous rio_dev
 916 * @prev_port: previous port number
 917 *
 918 * Recursively discovers a RIO network.  Transactions are sent via the
 919 * master port passed in @port.
 920 */
 921static int
 922rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
 923              u8 hopcount, struct rio_dev *prev, int prev_port)
 924{
 925        u8 port_num, route_port;
 926        struct rio_dev *rdev;
 927        u16 ndestid;
 928
 929        /* Setup new RIO device */
 930        if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
 931                /* Add device to the global and bus/net specific list. */
 932                list_add_tail(&rdev->net_list, &net->devices);
 933                rdev->prev = prev;
 934                if (prev && rio_is_switch(prev))
 935                        prev->rswitch->nextdev[prev_port] = rdev;
 936        } else
 937                return -1;
 938
 939        if (rio_is_switch(rdev)) {
 940                /* Associated destid is how we accessed this switch */
 941                rdev->destid = destid;
 942
 943                pr_debug(
 944                    "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 945                    rio_name(rdev), rdev->vid, rdev->did,
 946                    RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 947                for (port_num = 0;
 948                     port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 949                     port_num++) {
 950                        if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
 951                                continue;
 952
 953                        if (rio_sport_is_active
 954                            (port, destid, hopcount, port_num)) {
 955                                pr_debug(
 956                                    "RIO: scanning device on port %d\n",
 957                                    port_num);
 958
 959                                rio_lock_device(port, destid, hopcount, 1000);
 960
 961                                for (ndestid = 0;
 962                                     ndestid < RIO_ANY_DESTID(port->sys_size);
 963                                     ndestid++) {
 964                                        rio_route_get_entry(rdev,
 965                                                            RIO_GLOBAL_TABLE,
 966                                                            ndestid,
 967                                                            &route_port, 0);
 968                                        if (route_port == port_num)
 969                                                break;
 970                                }
 971
 972                                if (ndestid == RIO_ANY_DESTID(port->sys_size))
 973                                        continue;
 974                                rio_unlock_device(port, destid, hopcount);
 975                                if (rio_disc_peer(net, port, ndestid,
 976                                        hopcount + 1, rdev, port_num) < 0)
 977                                        return -1;
 978                        }
 979                }
 980        } else
 981                pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 982                    rio_name(rdev), rdev->vid, rdev->did);
 983
 984        return 0;
 985}
 986
 987/**
 988 * rio_mport_is_active- Tests if master port link is active
 989 * @port: Master port to test
 990 *
 991 * Reads the port error status CSR for the master port to
 992 * determine if the port has an active link.  Returns
 993 * %RIO_PORT_N_ERR_STS_PORT_OK if the  master port is active
 994 * or %0 if it is inactive.
 995 */
 996static int rio_mport_is_active(struct rio_mport *port)
 997{
 998        u32 result = 0;
 999        u32 ext_ftr_ptr;
1000        int *entry = rio_mport_phys_table;
1001
1002        do {
1003                if ((ext_ftr_ptr =
1004                     rio_mport_get_feature(port, 1, 0, 0, *entry)))
1005                        break;
1006        } while (*++entry >= 0);
1007
1008        if (ext_ftr_ptr)
1009                rio_local_read_config_32(port,
1010                                         ext_ftr_ptr +
1011                                         RIO_PORT_N_ERR_STS_CSR(port->index),
1012                                         &result);
1013
1014        return result & RIO_PORT_N_ERR_STS_PORT_OK;
1015}
1016
1017/**
1018 * rio_alloc_net- Allocate and configure a new RIO network
1019 * @port: Master port associated with the RIO network
1020 * @do_enum: Enumeration/Discovery mode flag
1021 * @start: logical minimal start id for new net
1022 *
1023 * Allocates a RIO network structure, initializes per-network
1024 * list heads, and adds the associated master port to the
1025 * network list of associated master ports. Returns a
1026 * RIO network pointer on success or %NULL on failure.
1027 */
1028static struct rio_net *rio_alloc_net(struct rio_mport *port,
1029                                               int do_enum, u16 start)
1030{
1031        struct rio_net *net;
1032
1033        net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1034        if (net && do_enum) {
1035                net->destid_table.table = kcalloc(
1036                        BITS_TO_LONGS(RIO_MAX_ROUTE_ENTRIES(port->sys_size)),
1037                        sizeof(long),
1038                        GFP_KERNEL);
1039
1040                if (net->destid_table.table == NULL) {
1041                        pr_err("RIO: failed to allocate destID table\n");
1042                        kfree(net);
1043                        net = NULL;
1044                } else {
1045                        net->destid_table.start = start;
1046                        net->destid_table.max =
1047                                        RIO_MAX_ROUTE_ENTRIES(port->sys_size);
1048                        spin_lock_init(&net->destid_table.lock);
1049                }
1050        }
1051
1052        if (net) {
1053                INIT_LIST_HEAD(&net->node);
1054                INIT_LIST_HEAD(&net->devices);
1055                INIT_LIST_HEAD(&net->switches);
1056                INIT_LIST_HEAD(&net->mports);
1057                list_add_tail(&port->nnode, &net->mports);
1058                net->hport = port;
1059                net->id = port->id;
1060        }
1061        return net;
1062}
1063
1064/**
1065 * rio_update_route_tables- Updates route tables in switches
1066 * @net: RIO network to run update on
1067 *
1068 * For each enumerated device, ensure that each switch in a system
1069 * has correct routing entries. Add routes for devices that where
1070 * unknown dirung the first enumeration pass through the switch.
1071 */
1072static void rio_update_route_tables(struct rio_net *net)
1073{
1074        struct rio_dev *rdev, *swrdev;
1075        struct rio_switch *rswitch;
1076        u8 sport;
1077        u16 destid;
1078
1079        list_for_each_entry(rdev, &net->devices, net_list) {
1080
1081                destid = rdev->destid;
1082
1083                list_for_each_entry(rswitch, &net->switches, node) {
1084
1085                        if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1086                                continue;
1087
1088                        if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1089                                swrdev = sw_to_rio_dev(rswitch);
1090
1091                                /* Skip if destid ends in empty switch*/
1092                                if (swrdev->destid == destid)
1093                                        continue;
1094
1095                                sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1096
1097                                if (rswitch->add_entry) {
1098                                        rio_route_add_entry(swrdev,
1099                                                RIO_GLOBAL_TABLE, destid,
1100                                                sport, 0);
1101                                        rswitch->route_table[destid] = sport;
1102                                }
1103                        }
1104                }
1105        }
1106}
1107
1108/**
1109 * rio_init_em - Initializes RIO Error Management (for switches)
1110 * @rdev: RIO device
1111 *
1112 * For each enumerated switch, call device-specific error management
1113 * initialization routine (if supplied by the switch driver).
1114 */
1115static void rio_init_em(struct rio_dev *rdev)
1116{
1117        if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1118            (rdev->rswitch->em_init)) {
1119                rdev->rswitch->em_init(rdev);
1120        }
1121}
1122
1123/**
1124 * rio_pw_enable - Enables/disables port-write handling by a master port
1125 * @port: Master port associated with port-write handling
1126 * @enable:  1=enable,  0=disable
1127 */
1128static void rio_pw_enable(struct rio_mport *port, int enable)
1129{
1130        if (port->ops->pwenable)
1131                port->ops->pwenable(port, enable);
1132}
1133
1134/**
1135 * rio_enum_mport- Start enumeration through a master port
1136 * @mport: Master port to send transactions
1137 * @flags: Enumeration control flags
1138 *
1139 * Starts the enumeration process. If somebody has enumerated our
1140 * master port device, then give up. If not and we have an active
1141 * link, then start recursive peer enumeration. Returns %0 if
1142 * enumeration succeeds or %-EBUSY if enumeration fails.
1143 */
1144int rio_enum_mport(struct rio_mport *mport, u32 flags)
1145{
1146        struct rio_net *net = NULL;
1147        int rc = 0;
1148
1149        printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1150               mport->name);
1151
1152        /*
1153         * To avoid multiple start requests (repeat enumeration is not supported
1154         * by this method) check if enumeration/discovery was performed for this
1155         * mport: if mport was added into the list of mports for a net exit
1156         * with error.
1157         */
1158        if (mport->nnode.next || mport->nnode.prev)
1159                return -EBUSY;
1160
1161        /* If somebody else enumerated our master port device, bail. */
1162        if (rio_enum_host(mport) < 0) {
1163                printk(KERN_INFO
1164                       "RIO: master port %d device has been enumerated by a remote host\n",
1165                       mport->id);
1166                rc = -EBUSY;
1167                goto out;
1168        }
1169
1170        /* If master port has an active link, allocate net and enum peers */
1171        if (rio_mport_is_active(mport)) {
1172                net = rio_alloc_net(mport, 1, 0);
1173                if (!net) {
1174                        printk(KERN_ERR "RIO: failed to allocate new net\n");
1175                        rc = -ENOMEM;
1176                        goto out;
1177                }
1178
1179                /* reserve mport destID in new net */
1180                rio_destid_reserve(net, mport->host_deviceid);
1181
1182                /* Enable Input Output Port (transmitter reviever) */
1183                rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1184
1185                /* Set component tag for host */
1186                rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1187                                          next_comptag++);
1188
1189                next_destid = rio_destid_alloc(net);
1190
1191                if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1192                        /* A higher priority host won enumeration, bail. */
1193                        printk(KERN_INFO
1194                               "RIO: master port %d device has lost enumeration to a remote host\n",
1195                               mport->id);
1196                        rio_clear_locks(net);
1197                        rc = -EBUSY;
1198                        goto out;
1199                }
1200                /* free the last allocated destID (unused) */
1201                rio_destid_free(net, next_destid);
1202                rio_update_route_tables(net);
1203                rio_clear_locks(net);
1204                rio_pw_enable(mport, 1);
1205        } else {
1206                printk(KERN_INFO "RIO: master port %d link inactive\n",
1207                       mport->id);
1208                rc = -EINVAL;
1209        }
1210
1211      out:
1212        return rc;
1213}
1214
1215/**
1216 * rio_build_route_tables- Generate route tables from switch route entries
1217 * @net: RIO network to run route tables scan on
1218 *
1219 * For each switch device, generate a route table by copying existing
1220 * route entries from the switch.
1221 */
1222static void rio_build_route_tables(struct rio_net *net)
1223{
1224        struct rio_switch *rswitch;
1225        struct rio_dev *rdev;
1226        int i;
1227        u8 sport;
1228
1229        list_for_each_entry(rswitch, &net->switches, node) {
1230                rdev = sw_to_rio_dev(rswitch);
1231
1232                rio_lock_device(net->hport, rdev->destid,
1233                                rdev->hopcount, 1000);
1234                for (i = 0;
1235                     i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1236                     i++) {
1237                        if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1238                                                i, &sport, 0) < 0)
1239                                continue;
1240                        rswitch->route_table[i] = sport;
1241                }
1242
1243                rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1244        }
1245}
1246
1247/**
1248 * rio_disc_mport- Start discovery through a master port
1249 * @mport: Master port to send transactions
1250 * @flags: discovery control flags
1251 *
1252 * Starts the discovery process. If we have an active link,
1253 * then wait for the signal that enumeration is complete (if wait
1254 * is allowed).
1255 * When enumeration completion is signaled, start recursive
1256 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1257 * on failure.
1258 */
1259int rio_disc_mport(struct rio_mport *mport, u32 flags)
1260{
1261        struct rio_net *net = NULL;
1262        unsigned long to_end;
1263
1264        printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1265               mport->name);
1266
1267        /* If master port has an active link, allocate net and discover peers */
1268        if (rio_mport_is_active(mport)) {
1269                if (rio_enum_complete(mport))
1270                        goto enum_done;
1271                else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1272                        return -EAGAIN;
1273
1274                pr_debug("RIO: wait for enumeration to complete...\n");
1275
1276                to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1277                while (time_before(jiffies, to_end)) {
1278                        if (rio_enum_complete(mport))
1279                                goto enum_done;
1280                        msleep(10);
1281                }
1282
1283                pr_debug("RIO: discovery timeout on mport %d %s\n",
1284                         mport->id, mport->name);
1285                goto bail;
1286enum_done:
1287                pr_debug("RIO: ... enumeration done\n");
1288
1289                net = rio_alloc_net(mport, 0, 0);
1290                if (!net) {
1291                        printk(KERN_ERR "RIO: Failed to allocate new net\n");
1292                        goto bail;
1293                }
1294
1295                /* Read DestID assigned by enumerator */
1296                rio_local_read_config_32(mport, RIO_DID_CSR,
1297                                         &mport->host_deviceid);
1298                mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1299                                                   mport->host_deviceid);
1300
1301                if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1302                                        0, NULL, 0) < 0) {
1303                        printk(KERN_INFO
1304                               "RIO: master port %d device has failed discovery\n",
1305                               mport->id);
1306                        goto bail;
1307                }
1308
1309                rio_build_route_tables(net);
1310        }
1311
1312        return 0;
1313bail:
1314        return -EBUSY;
1315}
1316
1317static struct rio_scan rio_scan_ops = {
1318        .enumerate = rio_enum_mport,
1319        .discover = rio_disc_mport,
1320};
1321
1322static bool scan;
1323module_param(scan, bool, 0);
1324MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1325                        "(default = 0)");
1326
1327/**
1328 * rio_basic_attach:
1329 *
1330 * When this enumeration/discovery method is loaded as a module this function
1331 * registers its specific enumeration and discover routines for all available
1332 * RapidIO mport devices. The "scan" command line parameter controls ability of
1333 * the module to start RapidIO enumeration/discovery automatically.
1334 *
1335 * Returns 0 for success or -EIO if unable to register itself.
1336 *
1337 * This enumeration/discovery method cannot be unloaded and therefore does not
1338 * provide a matching cleanup_module routine.
1339 */
1340
1341static int __init rio_basic_attach(void)
1342{
1343        if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1344                return -EIO;
1345        if (scan)
1346                rio_init_mports();
1347        return 0;
1348}
1349
1350late_initcall(rio_basic_attach);
1351
1352MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1353MODULE_LICENSE("GPL");
1354
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