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 = 1;
  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         /* Release host device id locks */
 125         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 126                                   port->host_deviceid);
 127         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 128         if ((result & 0xffff) != 0xffff) {
 129                 printk(KERN_INFO
 130                        "RIO: badness when releasing host lock on master port, result %8.8x\n",
 131                        result);
 132                 ret = -EINVAL;
 133         }
 134         list_for_each_entry(rdev, &rio_devices, global_list) {
 135                 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
 136                                     port->host_deviceid);
 137                 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
 138                 if ((result & 0xffff) != 0xffff) {
 139                         printk(KERN_INFO
 140                                "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
 141                                rdev->vid, rdev->did);
 142                         ret = -EINVAL;
 143                 }
 144
 145                 /* Mark device as discovered and enable master */
 146                 rio_read_config_32(rdev,
 147                                    rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 148                                    &result);
 149                 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
 150                 rio_write_config_32(rdev,
 151                                     rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 152                                     result);
 153         }
 154
 155         return ret;
 156 }
 157
 158 /**
 159  * rio_enum_host- Set host lock and initialize host destination ID
 160  * @port: Master port to issue transaction
 161  *
 162  * Sets the local host master port lock and destination ID register
 163  * with the host device ID value. The host device ID value is provided
 164  * by the platform. Returns %0 on success or %-1 on failure.
 165  */
 166 static int rio_enum_host(struct rio_mport *port)
 167 {
 168         u32 result;
 169
 170         /* Set master port host device id lock */
 171         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 172                                   port->host_deviceid);
 173
 174         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 175         if ((result & 0xffff) != port->host_deviceid)
 176                 return -1;
 177
 178         /* Set master port destid and init destid ctr */
 179         rio_local_set_device_id(port, port->host_deviceid);
 180
 181         if (next_destid == port->host_deviceid)
 182                 next_destid++;
 183
 184         return 0;
 185 }
 186
 187 /**
 188  * rio_device_has_destid- Test if a device contains a destination ID register
 189  * @port: Master port to issue transaction
 190  * @src_ops: RIO device source operations
 191  * @dst_ops: RIO device destination operations
 192  *
 193  * Checks the provided @src_ops and @dst_ops for the necessary transaction
 194  * capabilities that indicate whether or not a device will implement a
 195  * destination ID register. Returns 1 if true or 0 if false.
 196  */
 197 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
 198                                  int dst_ops)
 199 {
 200         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;
 201
 202         return !!((src_ops | dst_ops) & mask);
 203 }
 204
 205 /**
 206  * rio_release_dev- Frees a RIO device struct
 207  * @dev: LDM device associated with a RIO device struct
 208  *
 209  * Gets the RIO device struct associated a RIO device struct.
 210  * The RIO device struct is freed.
 211  */
 212 static void rio_release_dev(struct device *dev)
 213 {
 214         struct rio_dev *rdev;
 215
 216         rdev = to_rio_dev(dev);
 217         kfree(rdev);
 218 }
 219
 220 /**
 221  * rio_is_switch- Tests if a RIO device has switch capabilities
 222  * @rdev: RIO device
 223  *
 224  * Gets the RIO device Processing Element Features register
 225  * contents and tests for switch capabilities. Returns 1 if
 226  * the device is a switch or 0 if it is not a switch.
 227  * The RIO device struct is freed.
 228  */
 229 static int rio_is_switch(struct rio_dev *rdev)
 230 {
 231         if (rdev->pef & RIO_PEF_SWITCH)
 232                 return 1;
 233         return 0;
 234 }
 235
 236 /**
 237  * rio_switch_init - Sets switch operations for a particular vendor switch
 238  * @rdev: RIO device
 239  * @do_enum: Enumeration/Discovery mode flag
 240  *
 241  * Searches the RIO switch ops table for known switch types. If the vid
 242  * and did match a switch table entry, then call switch initialization
 243  * routine to setup switch-specific routines.
 244  */
 245 static void rio_switch_init(struct rio_dev *rdev, int do_enum)
 246 {
 247         struct rio_switch_ops *cur = __start_rio_switch_ops;
 248         struct rio_switch_ops *end = __end_rio_switch_ops;
 249
 250         while (cur < end) {
 251                 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
 252                         pr_debug("RIO: calling init routine for %s\n",
 253                                  rio_name(rdev));
 254                         cur->init_hook(rdev, do_enum);
 255                         break;
 256                 }
 257                 cur++;
 258         }
 259
 260         if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
 261                 pr_debug("RIO: adding STD routing ops for %s\n",
 262                         rio_name(rdev));
 263                 rdev->rswitch->add_entry = rio_std_route_add_entry;
 264                 rdev->rswitch->get_entry = rio_std_route_get_entry;
 265                 rdev->rswitch->clr_table = rio_std_route_clr_table;
 266         }
 267
 268         if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
 269                 printk(KERN_ERR "RIO: missing routing ops for %s\n",
 270                        rio_name(rdev));
 271 }
 272
 273 /**
 274  * rio_add_device- Adds a RIO device to the device model
 275  * @rdev: RIO device
 276  *
 277  * Adds the RIO device to the global device list and adds the RIO
 278  * device to the RIO device list.  Creates the generic sysfs nodes
 279  * for an RIO device.
 280  */
 281 static int __devinit rio_add_device(struct rio_dev *rdev)
 282 {
 283         int err;
 284
 285         err = device_add(&rdev->dev);
 286         if (err)
 287                 return err;
 288
 289         spin_lock(&rio_global_list_lock);
 290         list_add_tail(&rdev->global_list, &rio_devices);
 291         spin_unlock(&rio_global_list_lock);
 292
 293         rio_create_sysfs_dev_files(rdev);
 294
 295         return 0;
 296 }
 297
 298 /**
 299  * rio_enable_rx_tx_port - enable input reciever and output transmitter of
 300  * given port
 301  * @port: Master port associated with the RIO network
 302  * @local: local=1 select local port otherwise a far device is reached
 303  * @destid: Destination ID of the device to check host bit
 304  * @hopcount: Number of hops to reach the target
 305  * @port_num: Port (-number on switch) to enable on a far end device
 306  *
 307  * Returns 0 or 1 from on General Control Command and Status Register
 308  * (EXT_PTR+0x3C)
 309  */
 310 inline int rio_enable_rx_tx_port(struct rio_mport *port,
 311                                  int local, u16 destid,
 312                                  u8 hopcount, u8 port_num) {
 313 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
 314         u32 regval;
 315         u32 ext_ftr_ptr;
 316
 317         /*
 318         * enable rx input tx output port
 319         */
 320         pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
 321                  "%d, port_num = %d)\n", local, destid, hopcount, port_num);
 322
 323         ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
 324
 325         if (local) {
 326                 rio_local_read_config_32(port, ext_ftr_ptr +
 327                                 RIO_PORT_N_CTL_CSR(0),
 328                                 &regval);
 329         } else {
 330                 if (rio_mport_read_config_32(port, destid, hopcount,
 331                 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 0)
 332                         return -EIO;
 333         }
 334
 335         if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
 336                 /* serial */
 337                 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
 338                                 | RIO_PORT_N_CTL_EN_TX_SER;
 339         } else {
 340                 /* parallel */
 341                 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
 342                                 | RIO_PORT_N_CTL_EN_TX_PAR;
 343         }
 344
 345         if (local) {
 346                 rio_local_write_config_32(port, ext_ftr_ptr +
 347                                           RIO_PORT_N_CTL_CSR(0), regval);
 348         } else {
 349                 if (rio_mport_write_config_32(port, destid, hopcount,
 350                     ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
 351                         return -EIO;
 352         }
 353 #endif
 354         return 0;
 355 }
 356
 357 /**
 358  * rio_setup_device- Allocates and sets up a RIO device
 359  * @net: RIO network
 360  * @port: Master port to send transactions
 361  * @destid: Current destination ID
 362  * @hopcount: Current hopcount
 363  * @do_enum: Enumeration/Discovery mode flag
 364  *
 365  * Allocates a RIO device and configures fields based on configuration
 366  * space contents. If device has a destination ID register, a destination
 367  * ID is either assigned in enumeration mode or read from configuration
 368  * space in discovery mode.  If the device has switch capabilities, then
 369  * a switch is allocated and configured appropriately. Returns a pointer
 370  * to a RIO device on success or NULL on failure.
 371  *
 372  */
 373 static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
 374                                         struct rio_mport *port, u16 destid,
 375                                         u8 hopcount, int do_enum)
 376 {
 377         int ret = 0;
 378         struct rio_dev *rdev;
 379         struct rio_switch *rswitch = NULL;
 380         int result, rdid;
 381
 382         rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL);
 383         if (!rdev)
 384                 return NULL;
 385
 386         rdev->net = net;
 387         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
 388                                  &result);
 389         rdev->did = result >> 16;
 390         rdev->vid = result & 0xffff;
 391         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
 392                                  &rdev->device_rev);
 393         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
 394                                  &result);
 395         rdev->asm_did = result >> 16;
 396         rdev->asm_vid = result & 0xffff;
 397         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
 398                                  &result);
 399         rdev->asm_rev = result >> 16;
 400         rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
 401                                  &rdev->pef);
 402         if (rdev->pef & RIO_PEF_EXT_FEATURES) {
 403                 rdev->efptr = result & 0xffff;
 404                 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
 405                                                          hopcount);
 406
 407                 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
 408                                                 hopcount, RIO_EFB_ERR_MGMNT);
 409         }
 410
 411         if (rdev->pef & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
 412                 rio_mport_read_config_32(port, destid, hopcount,
 413                                          RIO_SWP_INFO_CAR, &rdev->swpinfo);
 414         }
 415
 416         rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
 417                                  &rdev->src_ops);
 418         rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
 419                                  &rdev->dst_ops);
 420
 421         if (do_enum) {
 422                 /* Assign component tag to device */
 423                 if (next_comptag >= 0x10000) {
 424                         pr_err("RIO: Component Tag Counter Overflow\n");
 425                         goto cleanup;
 426                 }
 427                 rio_mport_write_config_32(port, destid, hopcount,
 428                                           RIO_COMPONENT_TAG_CSR, next_comptag);
 429                 rdev->comp_tag = next_comptag++;
 430         }
 431
 432         if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
 433                 if (do_enum) {
 434                         rio_set_device_id(port, destid, hopcount, next_destid);
 435                         rdev->destid = next_destid++;
 436                         if (next_destid == port->host_deviceid)
 437                                 next_destid++;
 438                 } else
 439                         rdev->destid = rio_get_device_id(port, destid, hopcount);
 440
 441                 rdev->hopcount = 0xff;
 442         } else {
 443                 /* Switch device has an associated destID which
 444                  * will be adjusted later
 445                  */
 446                 rdev->destid = destid;
 447                 rdev->hopcount = hopcount;
 448         }
 449
 450         /* If a PE has both switch and other functions, show it as a switch */
 451         if (rio_is_switch(rdev)) {
 452                 rswitch = kzalloc(sizeof(*rswitch) +
 453                                   RIO_GET_TOTAL_PORTS(rdev->swpinfo) *
 454                                   sizeof(rswitch->nextdev[0]),
 455                                   GFP_KERNEL);
 456                 if (!rswitch)
 457                         goto cleanup;
 458                 rswitch->switchid = next_switchid;
 459                 rswitch->port_ok = 0;
 460                 rswitch->route_table = kzalloc(sizeof(u8)*
 461                                         RIO_MAX_ROUTE_ENTRIES(port->sys_size),
 462                                         GFP_KERNEL);
 463                 if (!rswitch->route_table)
 464                         goto cleanup;
 465                 /* Initialize switch route table */
 466                 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
 467                                 rdid++)
 468                         rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
 469                 rdev->rswitch = rswitch;
 470                 rswitch->rdev = rdev;
 471                 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
 472                              rdev->rswitch->switchid);
 473                 rio_switch_init(rdev, do_enum);
 474
 475                 if (do_enum && rdev->rswitch->clr_table)
 476                         rdev->rswitch->clr_table(port, destid, hopcount,
 477                                                  RIO_GLOBAL_TABLE);
 478
 479                 list_add_tail(&rswitch->node, &rio_switches);
 480
 481         } else {
 482                 if (do_enum)
 483                         /*Enable Input Output Port (transmitter reviever)*/
 484                         rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
 485
 486                 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
 487                              rdev->destid);
 488         }
 489
 490         rdev->dev.bus = &rio_bus_type;
 491         rdev->dev.parent = &rio_bus;
 492
 493         device_initialize(&rdev->dev);
 494         rdev->dev.release = rio_release_dev;
 495         rio_dev_get(rdev);
 496
 497         rdev->dma_mask = DMA_BIT_MASK(32);
 498         rdev->dev.dma_mask = &rdev->dma_mask;
 499         rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 500
 501         if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
 502             (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
 503                 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 504                                    0, 0xffff);
 505
 506         ret = rio_add_device(rdev);
 507         if (ret)
 508                 goto cleanup;
 509
 510         return rdev;
 511
 512 cleanup:
 513         if (rswitch) {
 514                 kfree(rswitch->route_table);
 515                 kfree(rswitch);
 516         }
 517         kfree(rdev);
 518         return NULL;
 519 }
 520
 521 /**
 522  * rio_sport_is_active- Tests if a switch port has an active connection.
 523  * @port: Master port to send transaction
 524  * @destid: Associated destination ID for switch
 525  * @hopcount: Hopcount to reach switch
 526  * @sport: Switch port number
 527  *
 528  * Reads the port error status CSR for a particular switch port to
 529  * determine if the port has an active link.  Returns
 530  * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
 531  * inactive.
 532  */
 533 static int
 534 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
 535 {
 536         u32 result = 0;
 537         u32 ext_ftr_ptr;
 538
 539         ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
 540
 541         while (ext_ftr_ptr) {
 542                 rio_mport_read_config_32(port, destid, hopcount,
 543                                          ext_ftr_ptr, &result);
 544                 result = RIO_GET_BLOCK_ID(result);
 545                 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
 546                     (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
 547                     (result == RIO_EFB_SER_EP_FREC_ID))
 548                         break;
 549
 550                 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
 551                                                 ext_ftr_ptr);
 552         }
 553
 554         if (ext_ftr_ptr)
 555                 rio_mport_read_config_32(port, destid, hopcount,
 556                                          ext_ftr_ptr +
 557                                          RIO_PORT_N_ERR_STS_CSR(sport),
 558                                          &result);
 559
 560         return result & RIO_PORT_N_ERR_STS_PORT_OK;
 561 }
 562
 563 /**
 564  * rio_lock_device - Acquires host device lock for specified device
 565  * @port: Master port to send transaction
 566  * @destid: Destination ID for device/switch
 567  * @hopcount: Hopcount to reach switch
 568  * @wait_ms: Max wait time in msec (0 = no timeout)
 569  *
 570  * Attepts to acquire host device lock for specified device
 571  * Returns 0 if device lock acquired or EINVAL if timeout expires.
 572  */
 573 static int
 574 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
 575 {
 576         u32 result;
 577         int tcnt = 0;
 578
 579         /* Attempt to acquire device lock */
 580         rio_mport_write_config_32(port, destid, hopcount,
 581                                   RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 582         rio_mport_read_config_32(port, destid, hopcount,
 583                                  RIO_HOST_DID_LOCK_CSR, &result);
 584
 585         while (result != port->host_deviceid) {
 586                 if (wait_ms != 0 && tcnt == wait_ms) {
 587                         pr_debug("RIO: timeout when locking device %x:%x\n",
 588                                 destid, hopcount);
 589                         return -EINVAL;
 590                 }
 591
 592                 /* Delay a bit */
 593                 mdelay(1);
 594                 tcnt++;
 595                 /* Try to acquire device lock again */
 596                 rio_mport_write_config_32(port, destid,
 597                         hopcount,
 598                         RIO_HOST_DID_LOCK_CSR,
 599                         port->host_deviceid);
 600                 rio_mport_read_config_32(port, destid,
 601                         hopcount,
 602                         RIO_HOST_DID_LOCK_CSR, &result);
 603         }
 604
 605         return 0;
 606 }
 607
 608 /**
 609  * rio_unlock_device - Releases host device lock for specified device
 610  * @port: Master port to send transaction
 611  * @destid: Destination ID for device/switch
 612  * @hopcount: Hopcount to reach switch
 613  *
 614  * Returns 0 if device lock released or EINVAL if fails.
 615  */
 616 static int
 617 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
 618 {
 619         u32 result;
 620
 621         /* Release device lock */
 622         rio_mport_write_config_32(port, destid,
 623                                   hopcount,
 624                                   RIO_HOST_DID_LOCK_CSR,
 625                                   port->host_deviceid);
 626         rio_mport_read_config_32(port, destid, hopcount,
 627                 RIO_HOST_DID_LOCK_CSR, &result);
 628         if ((result & 0xffff) != 0xffff) {
 629                 pr_debug("RIO: badness when releasing device lock %x:%x\n",
 630                          destid, hopcount);
 631                 return -EINVAL;
 632         }
 633
 634         return 0;
 635 }
 636
 637 /**
 638  * rio_route_add_entry- Add a route entry to a switch routing table
 639  * @rdev: RIO device
 640  * @table: Routing table ID
 641  * @route_destid: Destination ID to be routed
 642  * @route_port: Port number to be routed
 643  * @lock: lock switch device flag
 644  *
 645  * Calls the switch specific add_entry() method to add a route entry
 646  * on a switch. The route table can be specified using the @table
 647  * argument if a switch has per port routing tables or the normal
 648  * use is to specific all tables (or the global table) by passing
 649  * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 650  * on failure.
 651  */
 652 static int
 653 rio_route_add_entry(struct rio_dev *rdev,
 654                     u16 table, u16 route_destid, u8 route_port, int lock)
 655 {
 656         int rc;
 657
 658         if (lock) {
 659                 rc = rio_lock_device(rdev->net->hport, rdev->destid,
 660                                      rdev->hopcount, 1000);
 661                 if (rc)
 662                         return rc;
 663         }
 664
 665         rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
 666                                       rdev->hopcount, table,
 667                                       route_destid, route_port);
 668         if (lock)
 669                 rio_unlock_device(rdev->net->hport, rdev->destid,
 670                                   rdev->hopcount);
 671
 672         return rc;
 673 }
 674
 675 /**
 676  * rio_route_get_entry- Read a route entry in a switch routing table
 677  * @rdev: RIO device
 678  * @table: Routing table ID
 679  * @route_destid: Destination ID to be routed
 680  * @route_port: Pointer to read port number into
 681  * @lock: lock switch device flag
 682  *
 683  * Calls the switch specific get_entry() method to read a route entry
 684  * in a switch. The route table can be specified using the @table
 685  * argument if a switch has per port routing tables or the normal
 686  * use is to specific all tables (or the global table) by passing
 687  * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 688  * on failure.
 689  */
 690 static int
 691 rio_route_get_entry(struct rio_dev *rdev, u16 table,
 692                     u16 route_destid, u8 *route_port, int lock)
 693 {
 694         int rc;
 695
 696         if (lock) {
 697                 rc = rio_lock_device(rdev->net->hport, rdev->destid,
 698                                      rdev->hopcount, 1000);
 699                 if (rc)
 700                         return rc;
 701         }
 702
 703         rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
 704                                       rdev->hopcount, table,
 705                                       route_destid, route_port);
 706         if (lock)
 707                 rio_unlock_device(rdev->net->hport, rdev->destid,
 708                                   rdev->hopcount);
 709
 710         return rc;
 711 }
 712
 713 /**
 714  * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
 715  * @port: Master port to send transaction
 716  * @hopcount: Number of hops to the device
 717  *
 718  * Used during enumeration to read the Host Device ID Lock CSR on a
 719  * RIO device. Returns the value of the lock register.
 720  */
 721 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
 722 {
 723         u32 result;
 724
 725         rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
 726                                  RIO_HOST_DID_LOCK_CSR, &result);
 727
 728         return (u16) (result & 0xffff);
 729 }
 730
 731 /**
 732  * rio_enum_peer- Recursively enumerate a RIO network through a master port
 733  * @net: RIO network being enumerated
 734  * @port: Master port to send transactions
 735  * @hopcount: Number of hops into the network
 736  * @prev: Previous RIO device connected to the enumerated one
 737  * @prev_port: Port on previous RIO device
 738  *
 739  * Recursively enumerates a RIO network.  Transactions are sent via the
 740  * master port passed in @port.
 741  */
 742 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 743                          u8 hopcount, struct rio_dev *prev, int prev_port)
 744 {
 745         int port_num;
 746         int cur_destid;
 747         int sw_destid;
 748         int sw_inport;
 749         struct rio_dev *rdev;
 750         u16 destid;
 751         u32 regval;
 752         int tmp;
 753
 754         if (rio_mport_chk_dev_access(port,
 755                         RIO_ANY_DESTID(port->sys_size), hopcount)) {
 756                 pr_debug("RIO: device access check failed\n");
 757                 return -1;
 758         }
 759
 760         if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 761                 pr_debug("RIO: PE already discovered by this host\n");
 762                 /*
 763                  * Already discovered by this host. Add it as another
 764                  * link to the existing device.
 765                  */
 766                 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
 767                                 hopcount, RIO_COMPONENT_TAG_CSR, &regval);
 768
 769                 if (regval) {
 770                         rdev = rio_get_comptag((regval & 0xffff), NULL);
 771
 772                         if (rdev && prev && rio_is_switch(prev)) {
 773                                 pr_debug("RIO: redundant path to %s\n",
 774                                          rio_name(rdev));
 775                                 prev->rswitch->nextdev[prev_port] = rdev;
 776                         }
 777                 }
 778
 779                 return 0;
 780         }
 781
 782         /* Attempt to acquire device lock */
 783         rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 784                                   hopcount,
 785                                   RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 786         while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
 787                < port->host_deviceid) {
 788                 /* Delay a bit */
 789                 mdelay(1);
 790                 /* Attempt to acquire device lock again */
 791                 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 792                                           hopcount,
 793                                           RIO_HOST_DID_LOCK_CSR,
 794                                           port->host_deviceid);
 795         }
 796
 797         if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
 798                 pr_debug(
 799                     "RIO: PE locked by a higher priority host...retreating\n");
 800                 return -1;
 801         }
 802
 803         /* Setup new RIO device */
 804         rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
 805                                         hopcount, 1);
 806         if (rdev) {
 807                 /* Add device to the global and bus/net specific list. */
 808                 list_add_tail(&rdev->net_list, &net->devices);
 809                 rdev->prev = prev;
 810                 if (prev && rio_is_switch(prev))
 811                         prev->rswitch->nextdev[prev_port] = rdev;
 812         } else
 813                 return -1;
 814
 815         if (rio_is_switch(rdev)) {
 816                 next_switchid++;
 817                 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
 818                 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 819                                     port->host_deviceid, sw_inport, 0);
 820                 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
 821
 822                 for (destid = 0; destid < next_destid; destid++) {
 823                         if (destid == port->host_deviceid)
 824                                 continue;
 825                         rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 826                                             destid, sw_inport, 0);
 827                         rdev->rswitch->route_table[destid] = sw_inport;
 828                 }
 829
 830                 pr_debug(
 831                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 832                     rio_name(rdev), rdev->vid, rdev->did,
 833                     RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 834                 sw_destid = next_destid;
 835                 for (port_num = 0;
 836                      port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 837                      port_num++) {
 838                         /*Enable Input Output Port (transmitter reviever)*/
 839                         rio_enable_rx_tx_port(port, 0,
 840                                               RIO_ANY_DESTID(port->sys_size),
 841                                               hopcount, port_num);
 842
 843                         if (sw_inport == port_num) {
 844                                 rdev->rswitch->port_ok |= (1 << port_num);
 845                                 continue;
 846                         }
 847
 848                         cur_destid = next_destid;
 849
 850                         if (rio_sport_is_active
 851                             (port, RIO_ANY_DESTID(port->sys_size), hopcount,
 852                              port_num)) {
 853                                 pr_debug(
 854                                     "RIO: scanning device on port %d\n",
 855                                     port_num);
 856                                 rdev->rswitch->port_ok |= (1 << port_num);
 857                                 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 858                                                 RIO_ANY_DESTID(port->sys_size),
 859                                                 port_num, 0);
 860
 861                                 if (rio_enum_peer(net, port, hopcount + 1,
 862                                                   rdev, port_num) < 0)
 863                                         return -1;
 864
 865                                 /* Update routing tables */
 866                                 if (next_destid > cur_destid) {
 867                                         for (destid = cur_destid;
 868                                              destid < next_destid; destid++) {
 869                                                 if (destid == port->host_deviceid)
 870                                                         continue;
 871                                                 rio_route_add_entry(rdev,
 872                                                                     RIO_GLOBAL_TABLE,
 873                                                                     destid,
 874                                                                     port_num,
 875                                                                     0);
 876                                                 rdev->rswitch->
 877                                                     route_table[destid] =
 878                                                     port_num;
 879                                         }
 880                                 }
 881                         } else {
 882                                 /* If switch supports Error Management,
 883                                  * set PORT_LOCKOUT bit for unused port
 884                                  */
 885                                 if (rdev->em_efptr)
 886                                         rio_set_port_lockout(rdev, port_num, 1);
 887
 888                                 rdev->rswitch->port_ok &= ~(1 << port_num);
 889                         }
 890                 }
 891
 892                 /* Direct Port-write messages to the enumeratiing host */
 893                 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
 894                     (rdev->em_efptr)) {
 895                         rio_write_config_32(rdev,
 896                                         rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
 897                                         (port->host_deviceid << 16) |
 898                                         (port->sys_size << 15));
 899                 }
 900
 901                 rio_init_em(rdev);
 902
 903                 /* Check for empty switch */
 904                 if (next_destid == sw_destid) {
 905                         next_destid++;
 906                         if (next_destid == port->host_deviceid)
 907                                 next_destid++;
 908                 }
 909
 910                 rdev->destid = sw_destid;
 911         } else
 912                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 913                     rio_name(rdev), rdev->vid, rdev->did);
 914
 915         return 0;
 916 }
 917
 918 /**
 919  * rio_enum_complete- Tests if enumeration of a network is complete
 920  * @port: Master port to send transaction
 921  *
 922  * Tests the Component Tag CSR for non-zero value (enumeration
 923  * complete flag). Return %1 if enumeration is complete or %0 if
 924  * enumeration is incomplete.
 925  */
 926 static int rio_enum_complete(struct rio_mport *port)
 927 {
 928         u32 regval;
 929
 930         rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 931                                  &regval);
 932         return (regval & RIO_PORT_GEN_MASTER) ? 1 : 0;
 933 }
 934
 935 /**
 936  * rio_disc_peer- Recursively discovers a RIO network through a master port
 937  * @net: RIO network being discovered
 938  * @port: Master port to send transactions
 939  * @destid: Current destination ID in network
 940  * @hopcount: Number of hops into the network
 941  *
 942  * Recursively discovers a RIO network.  Transactions are sent via the
 943  * master port passed in @port.
 944  */
 945 static int __devinit
 946 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
 947               u8 hopcount)
 948 {
 949         u8 port_num, route_port;
 950         struct rio_dev *rdev;
 951         u16 ndestid;
 952
 953         /* Setup new RIO device */
 954         if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
 955                 /* Add device to the global and bus/net specific list. */
 956                 list_add_tail(&rdev->net_list, &net->devices);
 957         } else
 958                 return -1;
 959
 960         if (rio_is_switch(rdev)) {
 961                 next_switchid++;
 962
 963                 /* Associated destid is how we accessed this switch */
 964                 rdev->destid = destid;
 965
 966                 pr_debug(
 967                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 968                     rio_name(rdev), rdev->vid, rdev->did,
 969                     RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 970                 for (port_num = 0;
 971                      port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 972                      port_num++) {
 973                         if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
 974                                 continue;
 975
 976                         if (rio_sport_is_active
 977                             (port, destid, hopcount, port_num)) {
 978                                 pr_debug(
 979                                     "RIO: scanning device on port %d\n",
 980                                     port_num);
 981
 982                                 rio_lock_device(port, destid, hopcount, 1000);
 983
 984                                 for (ndestid = 0;
 985                                      ndestid < RIO_ANY_DESTID(port->sys_size);
 986                                      ndestid++) {
 987                                         rio_route_get_entry(rdev,
 988                                                             RIO_GLOBAL_TABLE,
 989                                                             ndestid,
 990                                                             &route_port, 0);
 991                                         if (route_port == port_num)
 992                                                 break;
 993                                 }
 994
 995                                 if (ndestid == RIO_ANY_DESTID(port->sys_size))
 996                                         continue;
 997                                 rio_unlock_device(port, destid, hopcount);
 998                                 if (rio_disc_peer
 999                                     (net, port, ndestid, hopcount + 1) < 0)
1000                                         return -1;
1001                         }
1002                 }
1003         } else
1004                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1005                     rio_name(rdev), rdev->vid, rdev->did);
1006
1007         return 0;
1008 }
1009
1010 /**
1011  * rio_mport_is_active- Tests if master port link is active
1012  * @port: Master port to test
1013  *
1014  * Reads the port error status CSR for the master port to
1015  * determine if the port has an active link.  Returns
1016  * %RIO_PORT_N_ERR_STS_PORT_OK if the  master port is active
1017  * or %0 if it is inactive.
1018  */
1019 static int rio_mport_is_active(struct rio_mport *port)
1020 {
1021         u32 result = 0;
1022         u32 ext_ftr_ptr;
1023         int *entry = rio_mport_phys_table;
1024
1025         do {
1026                 if ((ext_ftr_ptr =
1027                      rio_mport_get_feature(port, 1, 0, 0, *entry)))
1028                         break;
1029         } while (*++entry >= 0);
1030
1031         if (ext_ftr_ptr)
1032                 rio_local_read_config_32(port,
1033                                          ext_ftr_ptr +
1034                                          RIO_PORT_N_ERR_STS_CSR(port->index),
1035                                          &result);
1036
1037         return result & RIO_PORT_N_ERR_STS_PORT_OK;
1038 }
1039
1040 /**
1041  * rio_alloc_net- Allocate and configure a new RIO network
1042  * @port: Master port associated with the RIO network
1043  *
1044  * Allocates a RIO network structure, initializes per-network
1045  * list heads, and adds the associated master port to the
1046  * network list of associated master ports. Returns a
1047  * RIO network pointer on success or %NULL on failure.
1048  */
1049 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1050 {
1051         struct rio_net *net;
1052
1053         net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1054         if (net) {
1055                 INIT_LIST_HEAD(&net->node);
1056                 INIT_LIST_HEAD(&net->devices);
1057                 INIT_LIST_HEAD(&net->mports);
1058                 list_add_tail(&port->nnode, &net->mports);
1059                 net->hport = port;
1060                 net->id = next_net++;
1061         }
1062         return net;
1063 }
1064
1065 /**
1066  * rio_update_route_tables- Updates route tables in switches
1067  * @port: Master port associated with the RIO network
1068  *
1069  * For each enumerated device, ensure that each switch in a system
1070  * has correct routing entries. Add routes for devices that where
1071  * unknown dirung the first enumeration pass through the switch.
1072  */
1073 static void rio_update_route_tables(struct rio_mport *port)
1074 {
1075         struct rio_dev *rdev;
1076         struct rio_switch *rswitch;
1077         u8 sport;
1078         u16 destid;
1079
1080         list_for_each_entry(rdev, &rio_devices, global_list) {
1081
1082                 destid = rdev->destid;
1083
1084                 list_for_each_entry(rswitch, &rio_switches, node) {
1085
1086                         if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1087                                 continue;
1088
1089                         if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1090                                 /* Skip if destid ends in empty switch*/
1091                                 if (rswitch->rdev->destid == destid)
1092                                         continue;
1093
1094                                 sport = RIO_GET_PORT_NUM(rswitch->rdev->swpinfo);
1095
1096                                 if (rswitch->add_entry) {
1097                                         rio_route_add_entry(rswitch->rdev,
1098                                                 RIO_GLOBAL_TABLE, destid,
1099                                                 sport, 0);
1100                                         rswitch->route_table[destid] = sport;
1101                                 }
1102                         }
1103                 }
1104         }
1105 }
1106
1107 /**
1108  * rio_init_em - Initializes RIO Error Management (for switches)
1109  * @rdev: RIO device
1110  *
1111  * For each enumerated switch, call device-specific error management
1112  * initialization routine (if supplied by the switch driver).
1113  */
1114 static void rio_init_em(struct rio_dev *rdev)
1115 {
1116         if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1117             (rdev->rswitch->em_init)) {
1118                 rdev->rswitch->em_init(rdev);
1119         }
1120 }
1121
1122 /**
1123  * rio_pw_enable - Enables/disables port-write handling by a master port
1124  * @port: Master port associated with port-write handling
1125  * @enable:  1=enable,  0=disable
1126  */
1127 static void rio_pw_enable(struct rio_mport *port, int enable)
1128 {
1129         if (port->ops->pwenable)
1130                 port->ops->pwenable(port, enable);
1131 }
1132
1133 /**
1134  * rio_enum_mport- Start enumeration through a master port
1135  * @mport: Master port to send transactions
1136  *
1137  * Starts the enumeration process. If somebody has enumerated our
1138  * master port device, then give up. If not and we have an active
1139  * link, then start recursive peer enumeration. Returns %0 if
1140  * enumeration succeeds or %-EBUSY if enumeration fails.
1141  */
1142 int __devinit rio_enum_mport(struct rio_mport *mport)
1143 {
1144         struct rio_net *net = NULL;
1145         int rc = 0;
1146
1147         printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1148                mport->name);
1149         /* If somebody else enumerated our master port device, bail. */
1150         if (rio_enum_host(mport) < 0) {
1151                 printk(KERN_INFO
1152                        "RIO: master port %d device has been enumerated by a remote host\n",
1153                        mport->id);
1154                 rc = -EBUSY;
1155                 goto out;
1156         }
1157
1158         /* If master port has an active link, allocate net and enum peers */
1159         if (rio_mport_is_active(mport)) {
1160                 if (!(net = rio_alloc_net(mport))) {
1161                         printk(KERN_ERR "RIO: failed to allocate new net\n");
1162                         rc = -ENOMEM;
1163                         goto out;
1164                 }
1165
1166                 /* Enable Input Output Port (transmitter reviever) */
1167                 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1168
1169                 /* Set component tag for host */
1170                 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1171                                           next_comptag++);
1172
1173                 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1174                         /* A higher priority host won enumeration, bail. */
1175                         printk(KERN_INFO
1176                                "RIO: master port %d device has lost enumeration to a remote host\n",
1177                                mport->id);
1178                         rio_clear_locks(mport);
1179                         rc = -EBUSY;
1180                         goto out;
1181                 }
1182                 rio_update_route_tables(mport);
1183                 rio_clear_locks(mport);
1184                 rio_pw_enable(mport, 1);
1185         } else {
1186                 printk(KERN_INFO "RIO: master port %d link inactive\n",
1187                        mport->id);
1188                 rc = -EINVAL;
1189         }
1190
1191       out:
1192         return rc;
1193 }
1194
1195 /**
1196  * rio_build_route_tables- Generate route tables from switch route entries
1197  *
1198  * For each switch device, generate a route table by copying existing
1199  * route entries from the switch.
1200  */
1201 static void rio_build_route_tables(void)
1202 {
1203         struct rio_dev *rdev;
1204         int i;
1205         u8 sport;
1206
1207         list_for_each_entry(rdev, &rio_devices, global_list)
1208                 if (rio_is_switch(rdev)) {
1209                         rio_lock_device(rdev->net->hport, rdev->destid,
1210                                         rdev->hopcount, 1000);
1211                         for (i = 0;
1212                              i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1213                              i++) {
1214                                 if (rio_route_get_entry(rdev,
1215                                         RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1216                                         continue;
1217                                 rdev->rswitch->route_table[i] = sport;
1218                         }
1219
1220                         rio_unlock_device(rdev->net->hport,
1221                                           rdev->destid,
1222                                           rdev->hopcount);
1223                 }
1224 }
1225
1226 /**
1227  * rio_enum_timeout- Signal that enumeration timed out
1228  * @data: Address of timeout flag.
1229  *
1230  * When the enumeration complete timer expires, set a flag that
1231  * signals to the discovery process that enumeration did not
1232  * complete in a sane amount of time.
1233  */
1234 static void rio_enum_timeout(unsigned long data)
1235 {
1236         /* Enumeration timed out, set flag */
1237         *(int *)data = 1;
1238 }
1239
1240 /**
1241  * rio_disc_mport- Start discovery through a master port
1242  * @mport: Master port to send transactions
1243  *
1244  * Starts the discovery process. If we have an active link,
1245  * then wait for the signal that enumeration is complete.
1246  * When enumeration completion is signaled, start recursive
1247  * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1248  * on failure.
1249  */
1250 int __devinit rio_disc_mport(struct rio_mport *mport)
1251 {
1252         struct rio_net *net = NULL;
1253         int enum_timeout_flag = 0;
1254
1255         printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1256                mport->name);
1257
1258         /* If master port has an active link, allocate net and discover peers */
1259         if (rio_mport_is_active(mport)) {
1260                 if (!(net = rio_alloc_net(mport))) {
1261                         printk(KERN_ERR "RIO: Failed to allocate new net\n");
1262                         goto bail;
1263                 }
1264
1265                 pr_debug("RIO: wait for enumeration complete...");
1266
1267                 rio_enum_timer.expires =
1268                     jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1269                 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1270                 add_timer(&rio_enum_timer);
1271                 while (!rio_enum_complete(mport)) {
1272                         mdelay(1);
1273                         if (enum_timeout_flag) {
1274                                 del_timer_sync(&rio_enum_timer);
1275                                 goto timeout;
1276                         }
1277                 }
1278                 del_timer_sync(&rio_enum_timer);
1279
1280                 pr_debug("done\n");
1281
1282                 /* Read DestID assigned by enumerator */
1283                 rio_local_read_config_32(mport, RIO_DID_CSR,
1284                                          &mport->host_deviceid);
1285                 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1286                                                    mport->host_deviceid);
1287
1288                 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1289                                         0) < 0) {
1290                         printk(KERN_INFO
1291                                "RIO: master port %d device has failed discovery\n",
1292                                mport->id);
1293                         goto bail;
1294                 }
1295
1296                 rio_build_route_tables();
1297         }
1298
1299         return 0;
1300
1301       timeout:
1302         pr_debug("timeout\n");
1303       bail:
1304         return -EBUSY;
1305 }