drivers/rapidio/rio-scan.c

   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
  40 static void rio_init_em(struct rio_dev *rdev);
  41
  42 static int next_destid = 0;
  43 static int next_comptag = 1;
  44
  45 static 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  */
  62 static 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  */
  88 static 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  */
 107 static 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  */
 121 static 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  */
 141 static 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  */
 165 static 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  */
 183 static 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  */
 196 static 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  */
 210 static 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  */
 259 static 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  */
 286 static 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  */
 301 static 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  */
 318 static 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  */
 341 static 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
 485 cleanup:
 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  */
 505 static int
 506 rio_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  */
 545 static int
 546 rio_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  */
 588 static int
 589 rio_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  */
 624 static int
 625 rio_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  */
 662 static int
 663 rio_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  */
 693 static 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  */
 714 static 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  */
 900 static 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  */
 921 static int
 922 rio_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  */
 996 static 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  */
1028 static 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  */
1072 static 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  */
1115 static 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  */
1128 static 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  */
1144 int 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  */
1222 static 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  */
1259 int 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;
1286 enum_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;
1313 bail:
1314         return -EBUSY;
1315 }
1316
1317 static struct rio_scan rio_scan_ops = {
1318         .enumerate = rio_enum_mport,
1319         .discover = rio_disc_mport,
1320 };
1321
1322 static bool scan;
1323 module_param(scan, bool, 0);
1324 MODULE_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
1341 static 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
1350 late_initcall(rio_basic_attach);
1351
1352 MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1353 MODULE_LICENSE("GPL");