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/jiffies.h>
  35 #include <linux/slab.h>
  36
  37 #include "rio.h"
  38
  39 LIST_HEAD(rio_devices);
  40 static LIST_HEAD(rio_switches);
  41
  42 static void rio_enum_timeout(unsigned long);
  43
  44 static void rio_init_em(struct rio_dev *rdev);
  45
  46 DEFINE_SPINLOCK(rio_global_list_lock);
  47
  48 static int next_destid = 0;
  49 static int next_switchid = 0;
  50 static int next_net = 0;
  51 static int next_comptag;
  52
  53 static struct timer_list rio_enum_timer =
  54 TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
  55
  56 static int rio_mport_phys_table[] = {
  57         RIO_EFB_PAR_EP_ID,
  58         RIO_EFB_PAR_EP_REC_ID,
  59         RIO_EFB_SER_EP_ID,
  60         RIO_EFB_SER_EP_REC_ID,
  61         -1,
  62 };
  63
  64 /**
  65  * rio_get_device_id - Get the base/extended device id for a device
  66  * @port: RIO master port
  67  * @destid: Destination ID of device
  68  * @hopcount: Hopcount to device
  69  *
  70  * Reads the base/extended device id from a device. Returns the
  71  * 8/16-bit device ID.
  72  */
  73 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
  74 {
  75         u32 result;
  76
  77         rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
  78
  79         return RIO_GET_DID(port->sys_size, result);
  80 }
  81
  82 /**
  83  * rio_set_device_id - Set the base/extended device id for a device
  84  * @port: RIO master port
  85  * @destid: Destination ID of device
  86  * @hopcount: Hopcount to device
  87  * @did: Device ID value to be written
  88  *
  89  * Writes the base/extended device id from a device.
  90  */
  91 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
  92 {
  93         rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
  94                                   RIO_SET_DID(port->sys_size, did));
  95 }
  96
  97 /**
  98  * rio_local_set_device_id - Set the base/extended device id for a port
  99  * @port: RIO master port
 100  * @did: Device ID value to be written
 101  *
 102  * Writes the base/extended device id from a device.
 103  */
 104 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
 105 {
 106         rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
 107                                 did));
 108 }
 109
 110 /**
 111  * rio_clear_locks- Release all host locks and signal enumeration complete
 112  * @port: Master port to issue transaction
 113  *
 114  * Marks the component tag CSR on each device with the enumeration
 115  * complete flag. When complete, it then release the host locks on
 116  * each device. Returns 0 on success or %-EINVAL on failure.
 117  */
 118 static int rio_clear_locks(struct rio_mport *port)
 119 {
 120         struct rio_dev *rdev;
 121         u32 result;
 122         int ret = 0;
 123
 124         /* Assign component tag to all devices */
 125         next_comptag = 1;
 126         rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR, next_comptag++);
 127
 128         list_for_each_entry(rdev, &rio_devices, global_list) {
 129                 /* Mark device as discovered */
 130                 rio_read_config_32(rdev,
 131                                    rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 132                                    &result);
 133                 rio_write_config_32(rdev,
 134                                     rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 135                                     result | RIO_PORT_GEN_DISCOVERED);
 136
 137                 rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR, next_comptag);
 138                 rdev->comp_tag = next_comptag++;
 139                 if (next_comptag >= 0x10000) {
 140                         pr_err("RIO: Component Tag Counter Overflow\n");
 141                         break;
 142                 }
 143         }
 144
 145         /* Release host device id locks */
 146         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 147                                   port->host_deviceid);
 148         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 149         if ((result & 0xffff) != 0xffff) {
 150                 printk(KERN_INFO
 151                        "RIO: badness when releasing host lock on master port, result %8.8x\n",
 152                        result);
 153                 ret = -EINVAL;
 154         }
 155         list_for_each_entry(rdev, &rio_devices, global_list) {
 156                 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
 157                                     port->host_deviceid);
 158                 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
 159                 if ((result & 0xffff) != 0xffff) {
 160                         printk(KERN_INFO
 161                                "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
 162                                rdev->vid, rdev->did);
 163                         ret = -EINVAL;
 164                 }
 165         }
 166
 167         return ret;
 168 }
 169
 170 /**
 171  * rio_enum_host- Set host lock and initialize host destination ID
 172  * @port: Master port to issue transaction
 173  *
 174  * Sets the local host master port lock and destination ID register
 175  * with the host device ID value. The host device ID value is provided
 176  * by the platform. Returns %0 on success or %-1 on failure.
 177  */
 178 static int rio_enum_host(struct rio_mport *port)
 179 {
 180         u32 result;
 181
 182         /* Set master port host device id lock */
 183         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 184                                   port->host_deviceid);
 185
 186         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 187         if ((result & 0xffff) != port->host_deviceid)
 188                 return -1;
 189
 190         /* Set master port destid and init destid ctr */
 191         rio_local_set_device_id(port, port->host_deviceid);
 192
 193         if (next_destid == port->host_deviceid)
 194                 next_destid++;
 195
 196         return 0;
 197 }
 198
 199 /**
 200  * rio_device_has_destid- Test if a device contains a destination ID register
 201  * @port: Master port to issue transaction
 202  * @src_ops: RIO device source operations
 203  * @dst_ops: RIO device destination operations
 204  *
 205  * Checks the provided @src_ops and @dst_ops for the necessary transaction
 206  * capabilities that indicate whether or not a device will implement a
 207  * destination ID register. Returns 1 if true or 0 if false.
 208  */
 209 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
 210                                  int dst_ops)
 211 {
 212         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;
 213
 214         return !!((src_ops | dst_ops) & mask);
 215 }
 216
 217 /**
 218  * rio_release_dev- Frees a RIO device struct
 219  * @dev: LDM device associated with a RIO device struct
 220  *
 221  * Gets the RIO device struct associated a RIO device struct.
 222  * The RIO device struct is freed.
 223  */
 224 static void rio_release_dev(struct device *dev)
 225 {
 226         struct rio_dev *rdev;
 227
 228         rdev = to_rio_dev(dev);
 229         kfree(rdev);
 230 }
 231
 232 /**
 233  * rio_is_switch- Tests if a RIO device has switch capabilities
 234  * @rdev: RIO device
 235  *
 236  * Gets the RIO device Processing Element Features register
 237  * contents and tests for switch capabilities. Returns 1 if
 238  * the device is a switch or 0 if it is not a switch.
 239  * The RIO device struct is freed.
 240  */
 241 static int rio_is_switch(struct rio_dev *rdev)
 242 {
 243         if (rdev->pef & RIO_PEF_SWITCH)
 244                 return 1;
 245         return 0;
 246 }
 247
 248 /**
 249  * rio_switch_init - Sets switch operations for a particular vendor switch
 250  * @rdev: RIO device
 251  * @do_enum: Enumeration/Discovery mode flag
 252  *
 253  * Searches the RIO switch ops table for known switch types. If the vid
 254  * and did match a switch table entry, then call switch initialization
 255  * routine to setup switch-specific routines.
 256  */
 257 static void rio_switch_init(struct rio_dev *rdev, int do_enum)
 258 {
 259         struct rio_switch_ops *cur = __start_rio_switch_ops;
 260         struct rio_switch_ops *end = __end_rio_switch_ops;
 261
 262         while (cur < end) {
 263                 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
 264                         pr_debug("RIO: calling init routine for %s\n",
 265                                  rio_name(rdev));
 266                         cur->init_hook(rdev, do_enum);
 267                         break;
 268                 }
 269                 cur++;
 270         }
 271
 272         if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
 273                 pr_debug("RIO: adding STD routing ops for %s\n",
 274                         rio_name(rdev));
 275                 rdev->rswitch->add_entry = rio_std_route_add_entry;
 276                 rdev->rswitch->get_entry = rio_std_route_get_entry;
 277                 rdev->rswitch->clr_table = rio_std_route_clr_table;
 278         }
 279
 280         if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
 281                 printk(KERN_ERR "RIO: missing routing ops for %s\n",
 282                        rio_name(rdev));
 283 }
 284
 285 /**
 286  * rio_add_device- Adds a RIO device to the device model
 287  * @rdev: RIO device
 288  *
 289  * Adds the RIO device to the global device list and adds the RIO
 290  * device to the RIO device list.  Creates the generic sysfs nodes
 291  * for an RIO device.
 292  */
 293 static int __devinit rio_add_device(struct rio_dev *rdev)
 294 {
 295         int err;
 296
 297         err = device_add(&rdev->dev);
 298         if (err)
 299                 return err;
 300
 301         spin_lock(&rio_global_list_lock);
 302         list_add_tail(&rdev->global_list, &rio_devices);
 303         spin_unlock(&rio_global_list_lock);
 304
 305         rio_create_sysfs_dev_files(rdev);
 306
 307         return 0;
 308 }
 309
 310 /**
 311  * rio_enable_rx_tx_port - enable input reciever and output transmitter of
 312  * given port
 313  * @port: Master port associated with the RIO network
 314  * @local: local=1 select local port otherwise a far device is reached
 315  * @destid: Destination ID of the device to check host bit
 316  * @hopcount: Number of hops to reach the target
 317  * @port_num: Port (-number on switch) to enable on a far end device
 318  *
 319  * Returns 0 or 1 from on General Control Command and Status Register
 320  * (EXT_PTR+0x3C)
 321  */
 322 inline int rio_enable_rx_tx_port(struct rio_mport *port,
 323                                  int local, u16 destid,
 324                                  u8 hopcount, u8 port_num) {
 325 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
 326         u32 regval;
 327         u32 ext_ftr_ptr;
 328
 329         /*
 330         * enable rx input tx output port
 331         */
 332         pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
 333                  "%d, port_num = %d)\n", local, destid, hopcount, port_num);
 334
 335         ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
 336
 337         if (local) {
 338                 rio_local_read_config_32(port, ext_ftr_ptr +
 339                                 RIO_PORT_N_CTL_CSR(0),
 340                                 &regval);
 341         } else {
 342                 if (rio_mport_read_config_32(port, destid, hopcount,
 343                 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 0)
 344                         return -EIO;
 345         }
 346
 347         if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
 348                 /* serial */
 349                 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
 350                                 | RIO_PORT_N_CTL_EN_TX_SER;
 351         } else {
 352                 /* parallel */
 353                 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
 354                                 | RIO_PORT_N_CTL_EN_TX_PAR;
 355         }
 356
 357         if (local) {
 358                 rio_local_write_config_32(port, ext_ftr_ptr +
 359                                           RIO_PORT_N_CTL_CSR(0), regval);
 360         } else {
 361                 if (rio_mport_write_config_32(port, destid, hopcount,
 362                     ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
 363                         return -EIO;
 364         }
 365 #endif
 366         return 0;
 367 }
 368
 369 /**
 370  * rio_setup_device- Allocates and sets up a RIO device
 371  * @net: RIO network
 372  * @port: Master port to send transactions
 373  * @destid: Current destination ID
 374  * @hopcount: Current hopcount
 375  * @do_enum: Enumeration/Discovery mode flag
 376  *
 377  * Allocates a RIO device and configures fields based on configuration
 378  * space contents. If device has a destination ID register, a destination
 379  * ID is either assigned in enumeration mode or read from configuration
 380  * space in discovery mode.  If the device has switch capabilities, then
 381  * a switch is allocated and configured appropriately. Returns a pointer
 382  * to a RIO device on success or NULL on failure.
 383  *
 384  */
 385 static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
 386                                         struct rio_mport *port, u16 destid,
 387                                         u8 hopcount, int do_enum)
 388 {
 389         int ret = 0;
 390         struct rio_dev *rdev;
 391         struct rio_switch *rswitch = NULL;
 392         int result, rdid;
 393
 394         rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL);
 395         if (!rdev)
 396                 return NULL;
 397
 398         rdev->net = net;
 399         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
 400                                  &result);
 401         rdev->did = result >> 16;
 402         rdev->vid = result & 0xffff;
 403         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
 404                                  &rdev->device_rev);
 405         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
 406                                  &result);
 407         rdev->asm_did = result >> 16;
 408         rdev->asm_vid = result & 0xffff;
 409         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
 410                                  &result);
 411         rdev->asm_rev = result >> 16;
 412         rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
 413                                  &rdev->pef);
 414         if (rdev->pef & RIO_PEF_EXT_FEATURES) {
 415                 rdev->efptr = result & 0xffff;
 416                 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
 417                                                          hopcount);
 418
 419                 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
 420                                                 hopcount, RIO_EFB_ERR_MGMNT);
 421         }
 422
 423         if (rdev->pef & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
 424                 rio_mport_read_config_32(port, destid, hopcount,
 425                                          RIO_SWP_INFO_CAR, &rdev->swpinfo);
 426         }
 427
 428         rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
 429                                  &rdev->src_ops);
 430         rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
 431                                  &rdev->dst_ops);
 432
 433         if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
 434                 if (do_enum) {
 435                         rio_set_device_id(port, destid, hopcount, next_destid);
 436                         rdev->destid = next_destid++;
 437                         if (next_destid == port->host_deviceid)
 438                                 next_destid++;
 439                 } else
 440                         rdev->destid = rio_get_device_id(port, destid, hopcount);
 441         } else
 442                 /* Switch device has an associated destID */
 443                 rdev->destid = RIO_INVALID_DESTID;
 444
 445         /* If a PE has both switch and other functions, show it as a switch */
 446         if (rio_is_switch(rdev)) {
 447                 rswitch = kzalloc(sizeof(struct rio_switch), GFP_KERNEL);
 448                 if (!rswitch)
 449                         goto cleanup;
 450                 rswitch->switchid = next_switchid;
 451                 rswitch->hopcount = hopcount;
 452                 rswitch->destid = destid;
 453                 rswitch->port_ok = 0;
 454                 rswitch->route_table = kzalloc(sizeof(u8)*
 455                                         RIO_MAX_ROUTE_ENTRIES(port->sys_size),
 456                                         GFP_KERNEL);
 457                 if (!rswitch->route_table)
 458                         goto cleanup;
 459                 /* Initialize switch route table */
 460                 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
 461                                 rdid++)
 462                         rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
 463                 rdev->rswitch = rswitch;
 464                 rswitch->rdev = rdev;
 465                 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
 466                              rdev->rswitch->switchid);
 467                 rio_switch_init(rdev, do_enum);
 468
 469                 if (do_enum && rdev->rswitch->clr_table)
 470                         rdev->rswitch->clr_table(port, destid, hopcount,
 471                                                  RIO_GLOBAL_TABLE);
 472
 473                 list_add_tail(&rswitch->node, &rio_switches);
 474
 475         } else {
 476                 if (do_enum)
 477                         /*Enable Input Output Port (transmitter reviever)*/
 478                         rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
 479
 480                 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
 481                              rdev->destid);
 482         }
 483
 484         rdev->dev.bus = &rio_bus_type;
 485         rdev->dev.parent = &rio_bus;
 486
 487         device_initialize(&rdev->dev);
 488         rdev->dev.release = rio_release_dev;
 489         rio_dev_get(rdev);
 490
 491         rdev->dma_mask = DMA_BIT_MASK(32);
 492         rdev->dev.dma_mask = &rdev->dma_mask;
 493         rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 494
 495         if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
 496             (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
 497                 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 498                                    0, 0xffff);
 499
 500         ret = rio_add_device(rdev);
 501         if (ret)
 502                 goto cleanup;
 503
 504         return rdev;
 505
 506 cleanup:
 507         if (rswitch) {
 508                 kfree(rswitch->route_table);
 509                 kfree(rswitch);
 510         }
 511         kfree(rdev);
 512         return NULL;
 513 }
 514
 515 /**
 516  * rio_sport_is_active- Tests if a switch port has an active connection.
 517  * @port: Master port to send transaction
 518  * @destid: Associated destination ID for switch
 519  * @hopcount: Hopcount to reach switch
 520  * @sport: Switch port number
 521  *
 522  * Reads the port error status CSR for a particular switch port to
 523  * determine if the port has an active link.  Returns
 524  * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
 525  * inactive.
 526  */
 527 static int
 528 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
 529 {
 530         u32 result = 0;
 531         u32 ext_ftr_ptr;
 532
 533         ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
 534
 535         while (ext_ftr_ptr) {
 536                 rio_mport_read_config_32(port, destid, hopcount,
 537                                          ext_ftr_ptr, &result);
 538                 result = RIO_GET_BLOCK_ID(result);
 539                 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
 540                     (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
 541                     (result == RIO_EFB_SER_EP_FREC_ID))
 542                         break;
 543
 544                 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
 545                                                 ext_ftr_ptr);
 546         }
 547
 548         if (ext_ftr_ptr)
 549                 rio_mport_read_config_32(port, destid, hopcount,
 550                                          ext_ftr_ptr +
 551                                          RIO_PORT_N_ERR_STS_CSR(sport),
 552                                          &result);
 553
 554         return result & RIO_PORT_N_ERR_STS_PORT_OK;
 555 }
 556
 557 /**
 558  * rio_lock_device - Acquires host device lock for specified device
 559  * @port: Master port to send transaction
 560  * @destid: Destination ID for device/switch
 561  * @hopcount: Hopcount to reach switch
 562  * @wait_ms: Max wait time in msec (0 = no timeout)
 563  *
 564  * Attepts to acquire host device lock for specified device
 565  * Returns 0 if device lock acquired or EINVAL if timeout expires.
 566  */
 567 static int
 568 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
 569 {
 570         u32 result;
 571         int tcnt = 0;
 572
 573         /* Attempt to acquire device lock */
 574         rio_mport_write_config_32(port, destid, hopcount,
 575                                   RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 576         rio_mport_read_config_32(port, destid, hopcount,
 577                                  RIO_HOST_DID_LOCK_CSR, &result);
 578
 579         while (result != port->host_deviceid) {
 580                 if (wait_ms != 0 && tcnt == wait_ms) {
 581                         pr_debug("RIO: timeout when locking device %x:%x\n",
 582                                 destid, hopcount);
 583                         return -EINVAL;
 584                 }
 585
 586                 /* Delay a bit */
 587                 mdelay(1);
 588                 tcnt++;
 589                 /* Try to acquire device lock again */
 590                 rio_mport_write_config_32(port, destid,
 591                         hopcount,
 592                         RIO_HOST_DID_LOCK_CSR,
 593                         port->host_deviceid);
 594                 rio_mport_read_config_32(port, destid,
 595                         hopcount,
 596                         RIO_HOST_DID_LOCK_CSR, &result);
 597         }
 598
 599         return 0;
 600 }
 601
 602 /**
 603  * rio_unlock_device - Releases host device lock for specified device
 604  * @port: Master port to send transaction
 605  * @destid: Destination ID for device/switch
 606  * @hopcount: Hopcount to reach switch
 607  *
 608  * Returns 0 if device lock released or EINVAL if fails.
 609  */
 610 static int
 611 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
 612 {
 613         u32 result;
 614
 615         /* Release device lock */
 616         rio_mport_write_config_32(port, destid,
 617                                   hopcount,
 618                                   RIO_HOST_DID_LOCK_CSR,
 619                                   port->host_deviceid);
 620         rio_mport_read_config_32(port, destid, hopcount,
 621                 RIO_HOST_DID_LOCK_CSR, &result);
 622         if ((result & 0xffff) != 0xffff) {
 623                 pr_debug("RIO: badness when releasing device lock %x:%x\n",
 624                          destid, hopcount);
 625                 return -EINVAL;
 626         }
 627
 628         return 0;
 629 }
 630
 631 /**
 632  * rio_route_add_entry- Add a route entry to a switch routing table
 633  * @mport: Master port to send transaction
 634  * @rswitch: Switch device
 635  * @table: Routing table ID
 636  * @route_destid: Destination ID to be routed
 637  * @route_port: Port number to be routed
 638  * @lock: lock switch device flag
 639  *
 640  * Calls the switch specific add_entry() method to add a route entry
 641  * on a switch. The route table can be specified using the @table
 642  * argument if a switch has per port routing tables or the normal
 643  * use is to specific all tables (or the global table) by passing
 644  * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 645  * on failure.
 646  */
 647 static int
 648 rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch,
 649                     u16 table, u16 route_destid, u8 route_port, int lock)
 650 {
 651         int rc;
 652
 653         if (lock) {
 654                 rc = rio_lock_device(mport, rswitch->destid,
 655                                      rswitch->hopcount, 1000);
 656                 if (rc)
 657                         return rc;
 658         }
 659
 660         rc = rswitch->add_entry(mport, rswitch->destid,
 661                                         rswitch->hopcount, table,
 662                                         route_destid, route_port);
 663         if (lock)
 664                 rio_unlock_device(mport, rswitch->destid, rswitch->hopcount);
 665
 666         return rc;
 667 }
 668
 669 /**
 670  * rio_route_get_entry- Read a route entry in a switch routing table
 671  * @mport: Master port to send transaction
 672  * @rswitch: Switch device
 673  * @table: Routing table ID
 674  * @route_destid: Destination ID to be routed
 675  * @route_port: Pointer to read port number into
 676  * @lock: lock switch device flag
 677  *
 678  * Calls the switch specific get_entry() method to read a route entry
 679  * in a switch. The route table can be specified using the @table
 680  * argument if a switch has per port routing tables or the normal
 681  * use is to specific all tables (or the global table) by passing
 682  * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 683  * on failure.
 684  */
 685 static int
 686 rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table,
 687                     u16 route_destid, u8 *route_port, int lock)
 688 {
 689         int rc;
 690
 691         if (lock) {
 692                 rc = rio_lock_device(mport, rswitch->destid,
 693                                      rswitch->hopcount, 1000);
 694                 if (rc)
 695                         return rc;
 696         }
 697
 698         rc = rswitch->get_entry(mport, rswitch->destid,
 699                                         rswitch->hopcount, table,
 700                                         route_destid, route_port);
 701         if (lock)
 702                 rio_unlock_device(mport, rswitch->destid, rswitch->hopcount);
 703
 704         return rc;
 705 }
 706
 707 /**
 708  * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
 709  * @port: Master port to send transaction
 710  * @hopcount: Number of hops to the device
 711  *
 712  * Used during enumeration to read the Host Device ID Lock CSR on a
 713  * RIO device. Returns the value of the lock register.
 714  */
 715 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
 716 {
 717         u32 result;
 718
 719         rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
 720                                  RIO_HOST_DID_LOCK_CSR, &result);
 721
 722         return (u16) (result & 0xffff);
 723 }
 724
 725 /**
 726  * rio_get_swpinfo_tports- Gets total number of ports on the switch
 727  * @mport: Master port to send transaction
 728  * @destid: Destination ID associated with the switch
 729  * @hopcount: Number of hops to the device
 730  *
 731  * Returns total numbers of ports implemented by the switch device.
 732  */
 733 static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid,
 734                                  u8 hopcount)
 735 {
 736         u32 result;
 737
 738         rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
 739                                  &result);
 740
 741         return RIO_GET_TOTAL_PORTS(result);
 742 }
 743
 744 /**
 745  * rio_net_add_mport- Add a master port to a RIO network
 746  * @net: RIO network
 747  * @port: Master port to add
 748  *
 749  * Adds a master port to the network list of associated master
 750  * ports..
 751  */
 752 static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port)
 753 {
 754         spin_lock(&rio_global_list_lock);
 755         list_add_tail(&port->nnode, &net->mports);
 756         spin_unlock(&rio_global_list_lock);
 757 }
 758
 759 /**
 760  * rio_enum_peer- Recursively enumerate a RIO network through a master port
 761  * @net: RIO network being enumerated
 762  * @port: Master port to send transactions
 763  * @hopcount: Number of hops into the network
 764  *
 765  * Recursively enumerates a RIO network.  Transactions are sent via the
 766  * master port passed in @port.
 767  */
 768 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 769                          u8 hopcount)
 770 {
 771         int port_num;
 772         int num_ports;
 773         int cur_destid;
 774         int sw_destid;
 775         int sw_inport;
 776         struct rio_dev *rdev;
 777         u16 destid;
 778         int tmp;
 779
 780         if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 781                 pr_debug("RIO: PE already discovered by this host\n");
 782                 /*
 783                  * Already discovered by this host. Add it as another
 784                  * master port for the current network.
 785                  */
 786                 rio_net_add_mport(net, port);
 787                 return 0;
 788         }
 789
 790         /* Attempt to acquire device lock */
 791         rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 792                                   hopcount,
 793                                   RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 794         while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
 795                < port->host_deviceid) {
 796                 /* Delay a bit */
 797                 mdelay(1);
 798                 /* Attempt to acquire device lock again */
 799                 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 800                                           hopcount,
 801                                           RIO_HOST_DID_LOCK_CSR,
 802                                           port->host_deviceid);
 803         }
 804
 805         if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
 806                 pr_debug(
 807                     "RIO: PE locked by a higher priority host...retreating\n");
 808                 return -1;
 809         }
 810
 811         /* Setup new RIO device */
 812         rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
 813                                         hopcount, 1);
 814         if (rdev) {
 815                 /* Add device to the global and bus/net specific list. */
 816                 list_add_tail(&rdev->net_list, &net->devices);
 817         } else
 818                 return -1;
 819
 820         if (rio_is_switch(rdev)) {
 821                 next_switchid++;
 822                 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
 823                 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
 824                                     port->host_deviceid, sw_inport, 0);
 825                 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
 826
 827                 for (destid = 0; destid < next_destid; destid++) {
 828                         if (destid == port->host_deviceid)
 829                                 continue;
 830                         rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
 831                                             destid, sw_inport, 0);
 832                         rdev->rswitch->route_table[destid] = sw_inport;
 833                 }
 834
 835                 num_ports =
 836                     rio_get_swpinfo_tports(port, RIO_ANY_DESTID(port->sys_size),
 837                                                 hopcount);
 838                 pr_debug(
 839                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 840                     rio_name(rdev), rdev->vid, rdev->did, num_ports);
 841                 sw_destid = next_destid;
 842                 for (port_num = 0; port_num < num_ports; port_num++) {
 843                         /*Enable Input Output Port (transmitter reviever)*/
 844                         rio_enable_rx_tx_port(port, 0,
 845                                               RIO_ANY_DESTID(port->sys_size),
 846                                               hopcount, port_num);
 847
 848                         if (sw_inport == port_num) {
 849                                 rdev->rswitch->port_ok |= (1 << port_num);
 850                                 continue;
 851                         }
 852
 853                         cur_destid = next_destid;
 854
 855                         if (rio_sport_is_active
 856                             (port, RIO_ANY_DESTID(port->sys_size), hopcount,
 857                              port_num)) {
 858                                 pr_debug(
 859                                     "RIO: scanning device on port %d\n",
 860                                     port_num);
 861                                 rdev->rswitch->port_ok |= (1 << port_num);
 862                                 rio_route_add_entry(port, rdev->rswitch,
 863                                                 RIO_GLOBAL_TABLE,
 864                                                 RIO_ANY_DESTID(port->sys_size),
 865                                                 port_num, 0);
 866
 867                                 if (rio_enum_peer(net, port, hopcount + 1) < 0)
 868                                         return -1;
 869
 870                                 /* Update routing tables */
 871                                 if (next_destid > cur_destid) {
 872                                         for (destid = cur_destid;
 873                                              destid < next_destid; destid++) {
 874                                                 if (destid == port->host_deviceid)
 875                                                         continue;
 876                                                 rio_route_add_entry(port, rdev->rswitch,
 877                                                                     RIO_GLOBAL_TABLE,
 878                                                                     destid,
 879                                                                     port_num,
 880                                                                     0);
 881                                                 rdev->rswitch->
 882                                                     route_table[destid] =
 883                                                     port_num;
 884                                         }
 885                                 }
 886                         } else {
 887                                 /* If switch supports Error Management,
 888                                  * set PORT_LOCKOUT bit for unused port
 889                                  */
 890                                 if (rdev->em_efptr)
 891                                         rio_set_port_lockout(rdev, port_num, 1);
 892
 893                                 rdev->rswitch->port_ok &= ~(1 << port_num);
 894                         }
 895                 }
 896
 897                 /* Direct Port-write messages to the enumeratiing host */
 898                 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
 899                     (rdev->em_efptr)) {
 900                         rio_write_config_32(rdev,
 901                                         rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
 902                                         (port->host_deviceid << 16) |
 903                                         (port->sys_size << 15));
 904                 }
 905
 906                 rio_init_em(rdev);
 907
 908                 /* Check for empty switch */
 909                 if (next_destid == sw_destid) {
 910                         next_destid++;
 911                         if (next_destid == port->host_deviceid)
 912                                 next_destid++;
 913                 }
 914
 915                 rdev->rswitch->destid = sw_destid;
 916         } else
 917                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 918                     rio_name(rdev), rdev->vid, rdev->did);
 919
 920         return 0;
 921 }
 922
 923 /**
 924  * rio_enum_complete- Tests if enumeration of a network is complete
 925  * @port: Master port to send transaction
 926  *
 927  * Tests the Component Tag CSR for non-zero value (enumeration
 928  * complete flag). Return %1 if enumeration is complete or %0 if
 929  * enumeration is incomplete.
 930  */
 931 static int rio_enum_complete(struct rio_mport *port)
 932 {
 933         u32 tag_csr;
 934
 935         rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr);
 936         return (tag_csr & 0xffff) ? 1 : 0;
 937 }
 938
 939 /**
 940  * rio_disc_peer- Recursively discovers a RIO network through a master port
 941  * @net: RIO network being discovered
 942  * @port: Master port to send transactions
 943  * @destid: Current destination ID in network
 944  * @hopcount: Number of hops into the network
 945  *
 946  * Recursively discovers a RIO network.  Transactions are sent via the
 947  * master port passed in @port.
 948  */
 949 static int __devinit
 950 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
 951               u8 hopcount)
 952 {
 953         u8 port_num, route_port;
 954         int num_ports;
 955         struct rio_dev *rdev;
 956         u16 ndestid;
 957
 958         /* Setup new RIO device */
 959         if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
 960                 /* Add device to the global and bus/net specific list. */
 961                 list_add_tail(&rdev->net_list, &net->devices);
 962         } else
 963                 return -1;
 964
 965         if (rio_is_switch(rdev)) {
 966                 next_switchid++;
 967
 968                 /* Associated destid is how we accessed this switch */
 969                 rdev->rswitch->destid = destid;
 970
 971                 num_ports = rio_get_swpinfo_tports(port, destid, hopcount);
 972                 pr_debug(
 973                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 974                     rio_name(rdev), rdev->vid, rdev->did, num_ports);
 975                 for (port_num = 0; port_num < num_ports; port_num++) {
 976                         if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
 977                                 continue;
 978
 979                         if (rio_sport_is_active
 980                             (port, destid, hopcount, port_num)) {
 981                                 pr_debug(
 982                                     "RIO: scanning device on port %d\n",
 983                                     port_num);
 984
 985                                 rio_lock_device(port, destid, hopcount, 1000);
 986
 987                                 for (ndestid = 0;
 988                                      ndestid < RIO_ANY_DESTID(port->sys_size);
 989                                      ndestid++) {
 990                                         rio_route_get_entry(port, rdev->rswitch,
 991                                                             RIO_GLOBAL_TABLE,
 992                                                             ndestid,
 993                                                             &route_port, 0);
 994                                         if (route_port == port_num)
 995                                                 break;
 996                                 }
 997
 998                                 rio_unlock_device(port, destid, hopcount);
 999                                 if (rio_disc_peer
1000                                     (net, port, ndestid, hopcount + 1) < 0)
1001                                         return -1;
1002                         }
1003                 }
1004         } else
1005                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1006                     rio_name(rdev), rdev->vid, rdev->did);
1007
1008         return 0;
1009 }
1010
1011 /**
1012  * rio_mport_is_active- Tests if master port link is active
1013  * @port: Master port to test
1014  *
1015  * Reads the port error status CSR for the master port to
1016  * determine if the port has an active link.  Returns
1017  * %RIO_PORT_N_ERR_STS_PORT_OK if the  master port is active
1018  * or %0 if it is inactive.
1019  */
1020 static int rio_mport_is_active(struct rio_mport *port)
1021 {
1022         u32 result = 0;
1023         u32 ext_ftr_ptr;
1024         int *entry = rio_mport_phys_table;
1025
1026         do {
1027                 if ((ext_ftr_ptr =
1028                      rio_mport_get_feature(port, 1, 0, 0, *entry)))
1029                         break;
1030         } while (*++entry >= 0);
1031
1032         if (ext_ftr_ptr)
1033                 rio_local_read_config_32(port,
1034                                          ext_ftr_ptr +
1035                                          RIO_PORT_N_ERR_STS_CSR(port->index),
1036                                          &result);
1037
1038         return result & RIO_PORT_N_ERR_STS_PORT_OK;
1039 }
1040
1041 /**
1042  * rio_alloc_net- Allocate and configure a new RIO network
1043  * @port: Master port associated with the RIO network
1044  *
1045  * Allocates a RIO network structure, initializes per-network
1046  * list heads, and adds the associated master port to the
1047  * network list of associated master ports. Returns a
1048  * RIO network pointer on success or %NULL on failure.
1049  */
1050 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1051 {
1052         struct rio_net *net;
1053
1054         net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1055         if (net) {
1056                 INIT_LIST_HEAD(&net->node);
1057                 INIT_LIST_HEAD(&net->devices);
1058                 INIT_LIST_HEAD(&net->mports);
1059                 list_add_tail(&port->nnode, &net->mports);
1060                 net->hport = port;
1061                 net->id = next_net++;
1062         }
1063         return net;
1064 }
1065
1066 /**
1067  * rio_update_route_tables- Updates route tables in switches
1068  * @port: Master port associated with the RIO network
1069  *
1070  * For each enumerated device, ensure that each switch in a system
1071  * has correct routing entries. Add routes for devices that where
1072  * unknown dirung the first enumeration pass through the switch.
1073  */
1074 static void rio_update_route_tables(struct rio_mport *port)
1075 {
1076         struct rio_dev *rdev;
1077         struct rio_switch *rswitch;
1078         u8 sport;
1079         u16 destid;
1080
1081         list_for_each_entry(rdev, &rio_devices, global_list) {
1082
1083                 destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid;
1084
1085                 list_for_each_entry(rswitch, &rio_switches, node) {
1086
1087                         if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1088                                 continue;
1089
1090                         if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1091                                 /* Skip if destid ends in empty switch*/
1092                                 if (rswitch->destid == destid)
1093                                         continue;
1094
1095                                 sport = RIO_GET_PORT_NUM(rswitch->rdev->swpinfo);
1096
1097                                 if (rswitch->add_entry) {
1098                                         rio_route_add_entry(port, rswitch,
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  *
1138  * Starts the enumeration process. If somebody has enumerated our
1139  * master port device, then give up. If not and we have an active
1140  * link, then start recursive peer enumeration. Returns %0 if
1141  * enumeration succeeds or %-EBUSY if enumeration fails.
1142  */
1143 int __devinit rio_enum_mport(struct rio_mport *mport)
1144 {
1145         struct rio_net *net = NULL;
1146         int rc = 0;
1147
1148         printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1149                mport->name);
1150         /* If somebody else enumerated our master port device, bail. */
1151         if (rio_enum_host(mport) < 0) {
1152                 printk(KERN_INFO
1153                        "RIO: master port %d device has been enumerated by a remote host\n",
1154                        mport->id);
1155                 rc = -EBUSY;
1156                 goto out;
1157         }
1158
1159         /* If master port has an active link, allocate net and enum peers */
1160         if (rio_mport_is_active(mport)) {
1161                 if (!(net = rio_alloc_net(mport))) {
1162                         printk(KERN_ERR "RIO: failed to allocate new net\n");
1163                         rc = -ENOMEM;
1164                         goto out;
1165                 }
1166
1167                 /* Enable Input Output Port (transmitter reviever) */
1168                 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1169
1170                 if (rio_enum_peer(net, mport, 0) < 0) {
1171                         /* A higher priority host won enumeration, bail. */
1172                         printk(KERN_INFO
1173                                "RIO: master port %d device has lost enumeration to a remote host\n",
1174                                mport->id);
1175                         rio_clear_locks(mport);
1176                         rc = -EBUSY;
1177                         goto out;
1178                 }
1179                 rio_update_route_tables(mport);
1180                 rio_clear_locks(mport);
1181                 rio_pw_enable(mport, 1);
1182         } else {
1183                 printk(KERN_INFO "RIO: master port %d link inactive\n",
1184                        mport->id);
1185                 rc = -EINVAL;
1186         }
1187
1188       out:
1189         return rc;
1190 }
1191
1192 /**
1193  * rio_build_route_tables- Generate route tables from switch route entries
1194  *
1195  * For each switch device, generate a route table by copying existing
1196  * route entries from the switch.
1197  */
1198 static void rio_build_route_tables(void)
1199 {
1200         struct rio_dev *rdev;
1201         int i;
1202         u8 sport;
1203
1204         list_for_each_entry(rdev, &rio_devices, global_list)
1205                 if (rio_is_switch(rdev)) {
1206                         rio_lock_device(rdev->net->hport, rdev->rswitch->destid,
1207                                         rdev->rswitch->hopcount, 1000);
1208                         for (i = 0;
1209                              i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1210                              i++) {
1211                                 if (rio_route_get_entry
1212                                     (rdev->net->hport, rdev->rswitch,
1213                                      RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1214                                         continue;
1215                                 rdev->rswitch->route_table[i] = sport;
1216                         }
1217
1218                         rio_unlock_device(rdev->net->hport,
1219                                           rdev->rswitch->destid,
1220                                           rdev->rswitch->hopcount);
1221                 }
1222 }
1223
1224 /**
1225  * rio_enum_timeout- Signal that enumeration timed out
1226  * @data: Address of timeout flag.
1227  *
1228  * When the enumeration complete timer expires, set a flag that
1229  * signals to the discovery process that enumeration did not
1230  * complete in a sane amount of time.
1231  */
1232 static void rio_enum_timeout(unsigned long data)
1233 {
1234         /* Enumeration timed out, set flag */
1235         *(int *)data = 1;
1236 }
1237
1238 /**
1239  * rio_disc_mport- Start discovery through a master port
1240  * @mport: Master port to send transactions
1241  *
1242  * Starts the discovery process. If we have an active link,
1243  * then wait for the signal that enumeration is complete.
1244  * When enumeration completion is signaled, start recursive
1245  * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1246  * on failure.
1247  */
1248 int __devinit rio_disc_mport(struct rio_mport *mport)
1249 {
1250         struct rio_net *net = NULL;
1251         int enum_timeout_flag = 0;
1252
1253         printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1254                mport->name);
1255
1256         /* If master port has an active link, allocate net and discover peers */
1257         if (rio_mport_is_active(mport)) {
1258                 if (!(net = rio_alloc_net(mport))) {
1259                         printk(KERN_ERR "RIO: Failed to allocate new net\n");
1260                         goto bail;
1261                 }
1262
1263                 pr_debug("RIO: wait for enumeration complete...");
1264
1265                 rio_enum_timer.expires =
1266                     jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1267                 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1268                 add_timer(&rio_enum_timer);
1269                 while (!rio_enum_complete(mport)) {
1270                         mdelay(1);
1271                         if (enum_timeout_flag) {
1272                                 del_timer_sync(&rio_enum_timer);
1273                                 goto timeout;
1274                         }
1275                 }
1276                 del_timer_sync(&rio_enum_timer);
1277
1278                 pr_debug("done\n");
1279
1280                 /* Read DestID assigned by enumerator */
1281                 rio_local_read_config_32(mport, RIO_DID_CSR,
1282                                          &mport->host_deviceid);
1283                 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1284                                                    mport->host_deviceid);
1285
1286                 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1287                                         0) < 0) {
1288                         printk(KERN_INFO
1289                                "RIO: master port %d device has failed discovery\n",
1290                                mport->id);
1291                         goto bail;
1292                 }
1293
1294                 rio_build_route_tables();
1295         }
1296
1297         return 0;
1298
1299       timeout:
1300         pr_debug("timeout\n");
1301       bail:
1302         return -EBUSY;
1303 }