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_net = 0;
  50 static int next_comptag = 1;
  51
  52 static struct timer_list rio_enum_timer =
  53 TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
  54
  55 static int rio_mport_phys_table[] = {
  56         RIO_EFB_PAR_EP_ID,
  57         RIO_EFB_PAR_EP_REC_ID,
  58         RIO_EFB_SER_EP_ID,
  59         RIO_EFB_SER_EP_REC_ID,
  60         -1,
  61 };
  62
  63 /**
  64  * rio_get_device_id - Get the base/extended device id for a device
  65  * @port: RIO master port
  66  * @destid: Destination ID of device
  67  * @hopcount: Hopcount to device
  68  *
  69  * Reads the base/extended device id from a device. Returns the
  70  * 8/16-bit device ID.
  71  */
  72 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
  73 {
  74         u32 result;
  75
  76         rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
  77
  78         return RIO_GET_DID(port->sys_size, result);
  79 }
  80
  81 /**
  82  * rio_set_device_id - Set the base/extended device id for a device
  83  * @port: RIO master port
  84  * @destid: Destination ID of device
  85  * @hopcount: Hopcount to device
  86  * @did: Device ID value to be written
  87  *
  88  * Writes the base/extended device id from a device.
  89  */
  90 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
  91 {
  92         rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
  93                                   RIO_SET_DID(port->sys_size, did));
  94 }
  95
  96 /**
  97  * rio_local_set_device_id - Set the base/extended device id for a port
  98  * @port: RIO master port
  99  * @did: Device ID value to be written
 100  *
 101  * Writes the base/extended device id from a device.
 102  */
 103 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
 104 {
 105         rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
 106                                 did));
 107 }
 108
 109 /**
 110  * rio_clear_locks- Release all host locks and signal enumeration complete
 111  * @port: Master port to issue transaction
 112  *
 113  * Marks the component tag CSR on each device with the enumeration
 114  * complete flag. When complete, it then release the host locks on
 115  * each device. Returns 0 on success or %-EINVAL on failure.
 116  */
 117 static int rio_clear_locks(struct rio_mport *port)
 118 {
 119         struct rio_dev *rdev;
 120         u32 result;
 121         int ret = 0;
 122
 123         /* Release host device id locks */
 124         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 125                                   port->host_deviceid);
 126         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 127         if ((result & 0xffff) != 0xffff) {
 128                 printk(KERN_INFO
 129                        "RIO: badness when releasing host lock on master port, result %8.8x\n",
 130                        result);
 131                 ret = -EINVAL;
 132         }
 133         list_for_each_entry(rdev, &rio_devices, global_list) {
 134                 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
 135                                     port->host_deviceid);
 136                 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
 137                 if ((result & 0xffff) != 0xffff) {
 138                         printk(KERN_INFO
 139                                "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
 140                                rdev->vid, rdev->did);
 141                         ret = -EINVAL;
 142                 }
 143
 144                 /* Mark device as discovered and enable master */
 145                 rio_read_config_32(rdev,
 146                                    rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 147                                    &result);
 148                 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
 149                 rio_write_config_32(rdev,
 150                                     rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 151                                     result);
 152         }
 153
 154         return ret;
 155 }
 156
 157 /**
 158  * rio_enum_host- Set host lock and initialize host destination ID
 159  * @port: Master port to issue transaction
 160  *
 161  * Sets the local host master port lock and destination ID register
 162  * with the host device ID value. The host device ID value is provided
 163  * by the platform. Returns %0 on success or %-1 on failure.
 164  */
 165 static int rio_enum_host(struct rio_mport *port)
 166 {
 167         u32 result;
 168
 169         /* Set master port host device id lock */
 170         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 171                                   port->host_deviceid);
 172
 173         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 174         if ((result & 0xffff) != port->host_deviceid)
 175                 return -1;
 176
 177         /* Set master port destid and init destid ctr */
 178         rio_local_set_device_id(port, port->host_deviceid);
 179
 180         if (next_destid == port->host_deviceid)
 181                 next_destid++;
 182
 183         return 0;
 184 }
 185
 186 /**
 187  * rio_device_has_destid- Test if a device contains a destination ID register
 188  * @port: Master port to issue transaction
 189  * @src_ops: RIO device source operations
 190  * @dst_ops: RIO device destination operations
 191  *
 192  * Checks the provided @src_ops and @dst_ops for the necessary transaction
 193  * capabilities that indicate whether or not a device will implement a
 194  * destination ID register. Returns 1 if true or 0 if false.
 195  */
 196 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
 197                                  int dst_ops)
 198 {
 199         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;
 200
 201         return !!((src_ops | dst_ops) & mask);
 202 }
 203
 204 /**
 205  * rio_release_dev- Frees a RIO device struct
 206  * @dev: LDM device associated with a RIO device struct
 207  *
 208  * Gets the RIO device struct associated a RIO device struct.
 209  * The RIO device struct is freed.
 210  */
 211 static void rio_release_dev(struct device *dev)
 212 {
 213         struct rio_dev *rdev;
 214
 215         rdev = to_rio_dev(dev);
 216         kfree(rdev);
 217 }
 218
 219 /**
 220  * rio_is_switch- Tests if a RIO device has switch capabilities
 221  * @rdev: RIO device
 222  *
 223  * Gets the RIO device Processing Element Features register
 224  * contents and tests for switch capabilities. Returns 1 if
 225  * the device is a switch or 0 if it is not a switch.
 226  * The RIO device struct is freed.
 227  */
 228 static int rio_is_switch(struct rio_dev *rdev)
 229 {
 230         if (rdev->pef & RIO_PEF_SWITCH)
 231                 return 1;
 232         return 0;
 233 }
 234
 235 /**
 236  * rio_switch_init - Sets switch operations for a particular vendor switch
 237  * @rdev: RIO device
 238  * @do_enum: Enumeration/Discovery mode flag
 239  *
 240  * Searches the RIO switch ops table for known switch types. If the vid
 241  * and did match a switch table entry, then call switch initialization
 242  * routine to setup switch-specific routines.
 243  */
 244 static void rio_switch_init(struct rio_dev *rdev, int do_enum)
 245 {
 246         struct rio_switch_ops *cur = __start_rio_switch_ops;
 247         struct rio_switch_ops *end = __end_rio_switch_ops;
 248
 249         while (cur < end) {
 250                 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
 251                         pr_debug("RIO: calling init routine for %s\n",
 252                                  rio_name(rdev));
 253                         cur->init_hook(rdev, do_enum);
 254                         break;
 255                 }
 256                 cur++;
 257         }
 258
 259         if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
 260                 pr_debug("RIO: adding STD routing ops for %s\n",
 261                         rio_name(rdev));
 262                 rdev->rswitch->add_entry = rio_std_route_add_entry;
 263                 rdev->rswitch->get_entry = rio_std_route_get_entry;
 264                 rdev->rswitch->clr_table = rio_std_route_clr_table;
 265         }
 266
 267         if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
 268                 printk(KERN_ERR "RIO: missing routing ops for %s\n",
 269                        rio_name(rdev));
 270 }
 271
 272 /**
 273  * rio_add_device- Adds a RIO device to the device model
 274  * @rdev: RIO device
 275  *
 276  * Adds the RIO device to the global device list and adds the RIO
 277  * device to the RIO device list.  Creates the generic sysfs nodes
 278  * for an RIO device.
 279  */
 280 static int __devinit rio_add_device(struct rio_dev *rdev)
 281 {
 282         int err;
 283
 284         err = device_add(&rdev->dev);
 285         if (err)
 286                 return err;
 287
 288         spin_lock(&rio_global_list_lock);
 289         list_add_tail(&rdev->global_list, &rio_devices);
 290         spin_unlock(&rio_global_list_lock);
 291
 292         rio_create_sysfs_dev_files(rdev);
 293
 294         return 0;
 295 }
 296
 297 /**
 298  * rio_enable_rx_tx_port - enable input reciever and output transmitter of
 299  * given port
 300  * @port: Master port associated with the RIO network
 301  * @local: local=1 select local port otherwise a far device is reached
 302  * @destid: Destination ID of the device to check host bit
 303  * @hopcount: Number of hops to reach the target
 304  * @port_num: Port (-number on switch) to enable on a far end device
 305  *
 306  * Returns 0 or 1 from on General Control Command and Status Register
 307  * (EXT_PTR+0x3C)
 308  */
 309 inline int rio_enable_rx_tx_port(struct rio_mport *port,
 310                                  int local, u16 destid,
 311                                  u8 hopcount, u8 port_num) {
 312 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
 313         u32 regval;
 314         u32 ext_ftr_ptr;
 315
 316         /*
 317         * enable rx input tx output port
 318         */
 319         pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
 320                  "%d, port_num = %d)\n", local, destid, hopcount, port_num);
 321
 322         ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
 323
 324         if (local) {
 325                 rio_local_read_config_32(port, ext_ftr_ptr +
 326                                 RIO_PORT_N_CTL_CSR(0),
 327                                 &regval);
 328         } else {
 329                 if (rio_mport_read_config_32(port, destid, hopcount,
 330                 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 0)
 331                         return -EIO;
 332         }
 333
 334         if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
 335                 /* serial */
 336                 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
 337                                 | RIO_PORT_N_CTL_EN_TX_SER;
 338         } else {
 339                 /* parallel */
 340                 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
 341                                 | RIO_PORT_N_CTL_EN_TX_PAR;
 342         }
 343
 344         if (local) {
 345                 rio_local_write_config_32(port, ext_ftr_ptr +
 346                                           RIO_PORT_N_CTL_CSR(0), regval);
 347         } else {
 348                 if (rio_mport_write_config_32(port, destid, hopcount,
 349                     ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
 350                         return -EIO;
 351         }
 352 #endif
 353         return 0;
 354 }
 355
 356 /**
 357  * rio_setup_device- Allocates and sets up a RIO device
 358  * @net: RIO network
 359  * @port: Master port to send transactions
 360  * @destid: Current destination ID
 361  * @hopcount: Current hopcount
 362  * @do_enum: Enumeration/Discovery mode flag
 363  *
 364  * Allocates a RIO device and configures fields based on configuration
 365  * space contents. If device has a destination ID register, a destination
 366  * ID is either assigned in enumeration mode or read from configuration
 367  * space in discovery mode.  If the device has switch capabilities, then
 368  * a switch is allocated and configured appropriately. Returns a pointer
 369  * to a RIO device on success or NULL on failure.
 370  *
 371  */
 372 static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
 373                                         struct rio_mport *port, u16 destid,
 374                                         u8 hopcount, int do_enum)
 375 {
 376         int ret = 0;
 377         struct rio_dev *rdev;
 378         struct rio_switch *rswitch = NULL;
 379         int result, rdid;
 380         size_t size;
 381         u32 swpinfo = 0;
 382
 383         size = sizeof(struct rio_dev);
 384         if (rio_mport_read_config_32(port, destid, hopcount,
 385                                      RIO_PEF_CAR, &result))
 386                 return NULL;
 387
 388         if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
 389                 rio_mport_read_config_32(port, destid, hopcount,
 390                                          RIO_SWP_INFO_CAR, &swpinfo);
 391                 if (result & RIO_PEF_SWITCH) {
 392                         size += (RIO_GET_TOTAL_PORTS(swpinfo) *
 393                                 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
 394                 }
 395         }
 396
 397         rdev = kzalloc(size, GFP_KERNEL);
 398         if (!rdev)
 399                 return NULL;
 400
 401         rdev->net = net;
 402         rdev->pef = result;
 403         rdev->swpinfo = swpinfo;
 404         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
 405                                  &result);
 406         rdev->did = result >> 16;
 407         rdev->vid = result & 0xffff;
 408         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
 409                                  &rdev->device_rev);
 410         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
 411                                  &result);
 412         rdev->asm_did = result >> 16;
 413         rdev->asm_vid = result & 0xffff;
 414         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
 415                                  &result);
 416         rdev->asm_rev = result >> 16;
 417         if (rdev->pef & RIO_PEF_EXT_FEATURES) {
 418                 rdev->efptr = result & 0xffff;
 419                 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
 420                                                          hopcount);
 421
 422                 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
 423                                                 hopcount, RIO_EFB_ERR_MGMNT);
 424         }
 425
 426         rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
 427                                  &rdev->src_ops);
 428         rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
 429                                  &rdev->dst_ops);
 430
 431         if (do_enum) {
 432                 /* Assign component tag to device */
 433                 if (next_comptag >= 0x10000) {
 434                         pr_err("RIO: Component Tag Counter Overflow\n");
 435                         goto cleanup;
 436                 }
 437                 rio_mport_write_config_32(port, destid, hopcount,
 438                                           RIO_COMPONENT_TAG_CSR, next_comptag);
 439                 rdev->comp_tag = next_comptag++;
 440         }  else {
 441                 rio_mport_read_config_32(port, destid, hopcount,
 442                                          RIO_COMPONENT_TAG_CSR,
 443                                          &rdev->comp_tag);
 444         }
 445
 446         if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
 447                 if (do_enum) {
 448                         rio_set_device_id(port, destid, hopcount, next_destid);
 449                         rdev->destid = next_destid++;
 450                         if (next_destid == port->host_deviceid)
 451                                 next_destid++;
 452                 } else
 453                         rdev->destid = rio_get_device_id(port, destid, hopcount);
 454
 455                 rdev->hopcount = 0xff;
 456         } else {
 457                 /* Switch device has an associated destID which
 458                  * will be adjusted later
 459                  */
 460                 rdev->destid = destid;
 461                 rdev->hopcount = hopcount;
 462         }
 463
 464         /* If a PE has both switch and other functions, show it as a switch */
 465         if (rio_is_switch(rdev)) {
 466                 rswitch = rdev->rswitch;
 467                 rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID;
 468                 rswitch->port_ok = 0;
 469                 rswitch->route_table = kzalloc(sizeof(u8)*
 470                                         RIO_MAX_ROUTE_ENTRIES(port->sys_size),
 471                                         GFP_KERNEL);
 472                 if (!rswitch->route_table)
 473                         goto cleanup;
 474                 /* Initialize switch route table */
 475                 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
 476                                 rdid++)
 477                         rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
 478                 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
 479                              rswitch->switchid);
 480                 rio_switch_init(rdev, do_enum);
 481
 482                 if (do_enum && rswitch->clr_table)
 483                         rswitch->clr_table(port, destid, hopcount,
 484                                            RIO_GLOBAL_TABLE);
 485
 486                 list_add_tail(&rswitch->node, &rio_switches);
 487
 488         } else {
 489                 if (do_enum)
 490                         /*Enable Input Output Port (transmitter reviever)*/
 491                         rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
 492
 493                 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
 494                              rdev->destid);
 495         }
 496
 497         rdev->dev.bus = &rio_bus_type;
 498         rdev->dev.parent = &rio_bus;
 499
 500         device_initialize(&rdev->dev);
 501         rdev->dev.release = rio_release_dev;
 502         rio_dev_get(rdev);
 503
 504         rdev->dma_mask = DMA_BIT_MASK(32);
 505         rdev->dev.dma_mask = &rdev->dma_mask;
 506         rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 507
 508         if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
 509             (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
 510                 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 511                                    0, 0xffff);
 512
 513         ret = rio_add_device(rdev);
 514         if (ret)
 515                 goto cleanup;
 516
 517         return rdev;
 518
 519 cleanup:
 520         if (rswitch->route_table)
 521                 kfree(rswitch->route_table);
 522
 523         kfree(rdev);
 524         return NULL;
 525 }
 526
 527 /**
 528  * rio_sport_is_active- Tests if a switch port has an active connection.
 529  * @port: Master port to send transaction
 530  * @destid: Associated destination ID for switch
 531  * @hopcount: Hopcount to reach switch
 532  * @sport: Switch port number
 533  *
 534  * Reads the port error status CSR for a particular switch port to
 535  * determine if the port has an active link.  Returns
 536  * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
 537  * inactive.
 538  */
 539 static int
 540 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
 541 {
 542         u32 result = 0;
 543         u32 ext_ftr_ptr;
 544
 545         ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
 546
 547         while (ext_ftr_ptr) {
 548                 rio_mport_read_config_32(port, destid, hopcount,
 549                                          ext_ftr_ptr, &result);
 550                 result = RIO_GET_BLOCK_ID(result);
 551                 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
 552                     (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
 553                     (result == RIO_EFB_SER_EP_FREC_ID))
 554                         break;
 555
 556                 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
 557                                                 ext_ftr_ptr);
 558         }
 559
 560         if (ext_ftr_ptr)
 561                 rio_mport_read_config_32(port, destid, hopcount,
 562                                          ext_ftr_ptr +
 563                                          RIO_PORT_N_ERR_STS_CSR(sport),
 564                                          &result);
 565
 566         return result & RIO_PORT_N_ERR_STS_PORT_OK;
 567 }
 568
 569 /**
 570  * rio_lock_device - Acquires host device lock for specified device
 571  * @port: Master port to send transaction
 572  * @destid: Destination ID for device/switch
 573  * @hopcount: Hopcount to reach switch
 574  * @wait_ms: Max wait time in msec (0 = no timeout)
 575  *
 576  * Attepts to acquire host device lock for specified device
 577  * Returns 0 if device lock acquired or EINVAL if timeout expires.
 578  */
 579 static int
 580 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
 581 {
 582         u32 result;
 583         int tcnt = 0;
 584
 585         /* Attempt to acquire device lock */
 586         rio_mport_write_config_32(port, destid, hopcount,
 587                                   RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 588         rio_mport_read_config_32(port, destid, hopcount,
 589                                  RIO_HOST_DID_LOCK_CSR, &result);
 590
 591         while (result != port->host_deviceid) {
 592                 if (wait_ms != 0 && tcnt == wait_ms) {
 593                         pr_debug("RIO: timeout when locking device %x:%x\n",
 594                                 destid, hopcount);
 595                         return -EINVAL;
 596                 }
 597
 598                 /* Delay a bit */
 599                 mdelay(1);
 600                 tcnt++;
 601                 /* Try to acquire device lock again */
 602                 rio_mport_write_config_32(port, destid,
 603                         hopcount,
 604                         RIO_HOST_DID_LOCK_CSR,
 605                         port->host_deviceid);
 606                 rio_mport_read_config_32(port, destid,
 607                         hopcount,
 608                         RIO_HOST_DID_LOCK_CSR, &result);
 609         }
 610
 611         return 0;
 612 }
 613
 614 /**
 615  * rio_unlock_device - Releases host device lock for specified device
 616  * @port: Master port to send transaction
 617  * @destid: Destination ID for device/switch
 618  * @hopcount: Hopcount to reach switch
 619  *
 620  * Returns 0 if device lock released or EINVAL if fails.
 621  */
 622 static int
 623 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
 624 {
 625         u32 result;
 626
 627         /* Release device lock */
 628         rio_mport_write_config_32(port, destid,
 629                                   hopcount,
 630                                   RIO_HOST_DID_LOCK_CSR,
 631                                   port->host_deviceid);
 632         rio_mport_read_config_32(port, destid, hopcount,
 633                 RIO_HOST_DID_LOCK_CSR, &result);
 634         if ((result & 0xffff) != 0xffff) {
 635                 pr_debug("RIO: badness when releasing device lock %x:%x\n",
 636                          destid, hopcount);
 637                 return -EINVAL;
 638         }
 639
 640         return 0;
 641 }
 642
 643 /**
 644  * rio_route_add_entry- Add a route entry to a switch routing table
 645  * @rdev: RIO device
 646  * @table: Routing table ID
 647  * @route_destid: Destination ID to be routed
 648  * @route_port: Port number to be routed
 649  * @lock: lock switch device flag
 650  *
 651  * Calls the switch specific add_entry() method to add a route entry
 652  * on a switch. The route table can be specified using the @table
 653  * argument if a switch has per port routing tables or the normal
 654  * use is to specific all tables (or the global table) by passing
 655  * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 656  * on failure.
 657  */
 658 static int
 659 rio_route_add_entry(struct rio_dev *rdev,
 660                     u16 table, u16 route_destid, u8 route_port, int lock)
 661 {
 662         int rc;
 663
 664         if (lock) {
 665                 rc = rio_lock_device(rdev->net->hport, rdev->destid,
 666                                      rdev->hopcount, 1000);
 667                 if (rc)
 668                         return rc;
 669         }
 670
 671         rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
 672                                       rdev->hopcount, table,
 673                                       route_destid, route_port);
 674         if (lock)
 675                 rio_unlock_device(rdev->net->hport, rdev->destid,
 676                                   rdev->hopcount);
 677
 678         return rc;
 679 }
 680
 681 /**
 682  * rio_route_get_entry- Read a route entry in a switch routing table
 683  * @rdev: RIO device
 684  * @table: Routing table ID
 685  * @route_destid: Destination ID to be routed
 686  * @route_port: Pointer to read port number into
 687  * @lock: lock switch device flag
 688  *
 689  * Calls the switch specific get_entry() method to read a route entry
 690  * in a switch. The route table can be specified using the @table
 691  * argument if a switch has per port routing tables or the normal
 692  * use is to specific all tables (or the global table) by passing
 693  * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 694  * on failure.
 695  */
 696 static int
 697 rio_route_get_entry(struct rio_dev *rdev, u16 table,
 698                     u16 route_destid, u8 *route_port, int lock)
 699 {
 700         int rc;
 701
 702         if (lock) {
 703                 rc = rio_lock_device(rdev->net->hport, rdev->destid,
 704                                      rdev->hopcount, 1000);
 705                 if (rc)
 706                         return rc;
 707         }
 708
 709         rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
 710                                       rdev->hopcount, table,
 711                                       route_destid, route_port);
 712         if (lock)
 713                 rio_unlock_device(rdev->net->hport, rdev->destid,
 714                                   rdev->hopcount);
 715
 716         return rc;
 717 }
 718
 719 /**
 720  * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
 721  * @port: Master port to send transaction
 722  * @hopcount: Number of hops to the device
 723  *
 724  * Used during enumeration to read the Host Device ID Lock CSR on a
 725  * RIO device. Returns the value of the lock register.
 726  */
 727 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
 728 {
 729         u32 result;
 730
 731         rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
 732                                  RIO_HOST_DID_LOCK_CSR, &result);
 733
 734         return (u16) (result & 0xffff);
 735 }
 736
 737 /**
 738  * rio_enum_peer- Recursively enumerate a RIO network through a master port
 739  * @net: RIO network being enumerated
 740  * @port: Master port to send transactions
 741  * @hopcount: Number of hops into the network
 742  * @prev: Previous RIO device connected to the enumerated one
 743  * @prev_port: Port on previous RIO device
 744  *
 745  * Recursively enumerates a RIO network.  Transactions are sent via the
 746  * master port passed in @port.
 747  */
 748 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 749                          u8 hopcount, struct rio_dev *prev, int prev_port)
 750 {
 751         int port_num;
 752         int cur_destid;
 753         int sw_destid;
 754         int sw_inport;
 755         struct rio_dev *rdev;
 756         u16 destid;
 757         u32 regval;
 758         int tmp;
 759
 760         if (rio_mport_chk_dev_access(port,
 761                         RIO_ANY_DESTID(port->sys_size), hopcount)) {
 762                 pr_debug("RIO: device access check failed\n");
 763                 return -1;
 764         }
 765
 766         if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 767                 pr_debug("RIO: PE already discovered by this host\n");
 768                 /*
 769                  * Already discovered by this host. Add it as another
 770                  * link to the existing device.
 771                  */
 772                 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
 773                                 hopcount, RIO_COMPONENT_TAG_CSR, &regval);
 774
 775                 if (regval) {
 776                         rdev = rio_get_comptag((regval & 0xffff), NULL);
 777
 778                         if (rdev && prev && rio_is_switch(prev)) {
 779                                 pr_debug("RIO: redundant path to %s\n",
 780                                          rio_name(rdev));
 781                                 prev->rswitch->nextdev[prev_port] = rdev;
 782                         }
 783                 }
 784
 785                 return 0;
 786         }
 787
 788         /* Attempt to acquire device lock */
 789         rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 790                                   hopcount,
 791                                   RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 792         while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
 793                < port->host_deviceid) {
 794                 /* Delay a bit */
 795                 mdelay(1);
 796                 /* Attempt to acquire device lock again */
 797                 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 798                                           hopcount,
 799                                           RIO_HOST_DID_LOCK_CSR,
 800                                           port->host_deviceid);
 801         }
 802
 803         if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
 804                 pr_debug(
 805                     "RIO: PE locked by a higher priority host...retreating\n");
 806                 return -1;
 807         }
 808
 809         /* Setup new RIO device */
 810         rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
 811                                         hopcount, 1);
 812         if (rdev) {
 813                 /* Add device to the global and bus/net specific list. */
 814                 list_add_tail(&rdev->net_list, &net->devices);
 815                 rdev->prev = prev;
 816                 if (prev && rio_is_switch(prev))
 817                         prev->rswitch->nextdev[prev_port] = rdev;
 818         } else
 819                 return -1;
 820
 821         if (rio_is_switch(rdev)) {
 822                 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
 823                 rio_route_add_entry(rdev, 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(rdev, RIO_GLOBAL_TABLE,
 831                                             destid, sw_inport, 0);
 832                         rdev->rswitch->route_table[destid] = sw_inport;
 833                 }
 834
 835                 pr_debug(
 836                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 837                     rio_name(rdev), rdev->vid, rdev->did,
 838                     RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 839                 sw_destid = next_destid;
 840                 for (port_num = 0;
 841                      port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 842                      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(rdev, RIO_GLOBAL_TABLE,
 863                                                 RIO_ANY_DESTID(port->sys_size),
 864                                                 port_num, 0);
 865
 866                                 if (rio_enum_peer(net, port, hopcount + 1,
 867                                                   rdev, port_num) < 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(rdev,
 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->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 regval;
 934
 935         rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 936                                  &regval);
 937         return (regval & RIO_PORT_GEN_MASTER) ? 1 : 0;
 938 }
 939
 940 /**
 941  * rio_disc_peer- Recursively discovers a RIO network through a master port
 942  * @net: RIO network being discovered
 943  * @port: Master port to send transactions
 944  * @destid: Current destination ID in network
 945  * @hopcount: Number of hops into the network
 946  * @prev: previous rio_dev
 947  * @prev_port: previous port number
 948  *
 949  * Recursively discovers a RIO network.  Transactions are sent via the
 950  * master port passed in @port.
 951  */
 952 static int __devinit
 953 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
 954               u8 hopcount, struct rio_dev *prev, int prev_port)
 955 {
 956         u8 port_num, route_port;
 957         struct rio_dev *rdev;
 958         u16 ndestid;
 959
 960         /* Setup new RIO device */
 961         if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
 962                 /* Add device to the global and bus/net specific list. */
 963                 list_add_tail(&rdev->net_list, &net->devices);
 964                 rdev->prev = prev;
 965                 if (prev && rio_is_switch(prev))
 966                         prev->rswitch->nextdev[prev_port] = rdev;
 967         } else
 968                 return -1;
 969
 970         if (rio_is_switch(rdev)) {
 971                 /* Associated destid is how we accessed this switch */
 972                 rdev->destid = destid;
 973
 974                 pr_debug(
 975                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 976                     rio_name(rdev), rdev->vid, rdev->did,
 977                     RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 978                 for (port_num = 0;
 979                      port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 980                      port_num++) {
 981                         if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
 982                                 continue;
 983
 984                         if (rio_sport_is_active
 985                             (port, destid, hopcount, port_num)) {
 986                                 pr_debug(
 987                                     "RIO: scanning device on port %d\n",
 988                                     port_num);
 989
 990                                 rio_lock_device(port, destid, hopcount, 1000);
 991
 992                                 for (ndestid = 0;
 993                                      ndestid < RIO_ANY_DESTID(port->sys_size);
 994                                      ndestid++) {
 995                                         rio_route_get_entry(rdev,
 996                                                             RIO_GLOBAL_TABLE,
 997                                                             ndestid,
 998                                                             &route_port, 0);
 999                                         if (route_port == port_num)
1000                                                 break;
1001                                 }
1002
1003                                 if (ndestid == RIO_ANY_DESTID(port->sys_size))
1004                                         continue;
1005                                 rio_unlock_device(port, destid, hopcount);
1006                                 if (rio_disc_peer(net, port, ndestid,
1007                                         hopcount + 1, rdev, port_num) < 0)
1008                                         return -1;
1009                         }
1010                 }
1011         } else
1012                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1013                     rio_name(rdev), rdev->vid, rdev->did);
1014
1015         return 0;
1016 }
1017
1018 /**
1019  * rio_mport_is_active- Tests if master port link is active
1020  * @port: Master port to test
1021  *
1022  * Reads the port error status CSR for the master port to
1023  * determine if the port has an active link.  Returns
1024  * %RIO_PORT_N_ERR_STS_PORT_OK if the  master port is active
1025  * or %0 if it is inactive.
1026  */
1027 static int rio_mport_is_active(struct rio_mport *port)
1028 {
1029         u32 result = 0;
1030         u32 ext_ftr_ptr;
1031         int *entry = rio_mport_phys_table;
1032
1033         do {
1034                 if ((ext_ftr_ptr =
1035                      rio_mport_get_feature(port, 1, 0, 0, *entry)))
1036                         break;
1037         } while (*++entry >= 0);
1038
1039         if (ext_ftr_ptr)
1040                 rio_local_read_config_32(port,
1041                                          ext_ftr_ptr +
1042                                          RIO_PORT_N_ERR_STS_CSR(port->index),
1043                                          &result);
1044
1045         return result & RIO_PORT_N_ERR_STS_PORT_OK;
1046 }
1047
1048 /**
1049  * rio_alloc_net- Allocate and configure a new RIO network
1050  * @port: Master port associated with the RIO network
1051  *
1052  * Allocates a RIO network structure, initializes per-network
1053  * list heads, and adds the associated master port to the
1054  * network list of associated master ports. Returns a
1055  * RIO network pointer on success or %NULL on failure.
1056  */
1057 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1058 {
1059         struct rio_net *net;
1060
1061         net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1062         if (net) {
1063                 INIT_LIST_HEAD(&net->node);
1064                 INIT_LIST_HEAD(&net->devices);
1065                 INIT_LIST_HEAD(&net->mports);
1066                 list_add_tail(&port->nnode, &net->mports);
1067                 net->hport = port;
1068                 net->id = next_net++;
1069         }
1070         return net;
1071 }
1072
1073 /**
1074  * rio_update_route_tables- Updates route tables in switches
1075  * @port: Master port associated with the RIO network
1076  *
1077  * For each enumerated device, ensure that each switch in a system
1078  * has correct routing entries. Add routes for devices that where
1079  * unknown dirung the first enumeration pass through the switch.
1080  */
1081 static void rio_update_route_tables(struct rio_mport *port)
1082 {
1083         struct rio_dev *rdev, *swrdev;
1084         struct rio_switch *rswitch;
1085         u8 sport;
1086         u16 destid;
1087
1088         list_for_each_entry(rdev, &rio_devices, global_list) {
1089
1090                 destid = rdev->destid;
1091
1092                 list_for_each_entry(rswitch, &rio_switches, node) {
1093
1094                         if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1095                                 continue;
1096
1097                         if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1098                                 swrdev = sw_to_rio_dev(rswitch);
1099
1100                                 /* Skip if destid ends in empty switch*/
1101                                 if (swrdev->destid == destid)
1102                                         continue;
1103
1104                                 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1105
1106                                 if (rswitch->add_entry) {
1107                                         rio_route_add_entry(swrdev,
1108                                                 RIO_GLOBAL_TABLE, destid,
1109                                                 sport, 0);
1110                                         rswitch->route_table[destid] = sport;
1111                                 }
1112                         }
1113                 }
1114         }
1115 }
1116
1117 /**
1118  * rio_init_em - Initializes RIO Error Management (for switches)
1119  * @rdev: RIO device
1120  *
1121  * For each enumerated switch, call device-specific error management
1122  * initialization routine (if supplied by the switch driver).
1123  */
1124 static void rio_init_em(struct rio_dev *rdev)
1125 {
1126         if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1127             (rdev->rswitch->em_init)) {
1128                 rdev->rswitch->em_init(rdev);
1129         }
1130 }
1131
1132 /**
1133  * rio_pw_enable - Enables/disables port-write handling by a master port
1134  * @port: Master port associated with port-write handling
1135  * @enable:  1=enable,  0=disable
1136  */
1137 static void rio_pw_enable(struct rio_mport *port, int enable)
1138 {
1139         if (port->ops->pwenable)
1140                 port->ops->pwenable(port, enable);
1141 }
1142
1143 /**
1144  * rio_enum_mport- Start enumeration through a master port
1145  * @mport: Master port to send transactions
1146  *
1147  * Starts the enumeration process. If somebody has enumerated our
1148  * master port device, then give up. If not and we have an active
1149  * link, then start recursive peer enumeration. Returns %0 if
1150  * enumeration succeeds or %-EBUSY if enumeration fails.
1151  */
1152 int __devinit rio_enum_mport(struct rio_mport *mport)
1153 {
1154         struct rio_net *net = NULL;
1155         int rc = 0;
1156
1157         printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1158                mport->name);
1159         /* If somebody else enumerated our master port device, bail. */
1160         if (rio_enum_host(mport) < 0) {
1161                 printk(KERN_INFO
1162                        "RIO: master port %d device has been enumerated by a remote host\n",
1163                        mport->id);
1164                 rc = -EBUSY;
1165                 goto out;
1166         }
1167
1168         /* If master port has an active link, allocate net and enum peers */
1169         if (rio_mport_is_active(mport)) {
1170                 if (!(net = rio_alloc_net(mport))) {
1171                         printk(KERN_ERR "RIO: failed to allocate new net\n");
1172                         rc = -ENOMEM;
1173                         goto out;
1174                 }
1175
1176                 /* Enable Input Output Port (transmitter reviever) */
1177                 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1178
1179                 /* Set component tag for host */
1180                 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1181                                           next_comptag++);
1182
1183                 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1184                         /* A higher priority host won enumeration, bail. */
1185                         printk(KERN_INFO
1186                                "RIO: master port %d device has lost enumeration to a remote host\n",
1187                                mport->id);
1188                         rio_clear_locks(mport);
1189                         rc = -EBUSY;
1190                         goto out;
1191                 }
1192                 rio_update_route_tables(mport);
1193                 rio_clear_locks(mport);
1194                 rio_pw_enable(mport, 1);
1195         } else {
1196                 printk(KERN_INFO "RIO: master port %d link inactive\n",
1197                        mport->id);
1198                 rc = -EINVAL;
1199         }
1200
1201       out:
1202         return rc;
1203 }
1204
1205 /**
1206  * rio_build_route_tables- Generate route tables from switch route entries
1207  *
1208  * For each switch device, generate a route table by copying existing
1209  * route entries from the switch.
1210  */
1211 static void rio_build_route_tables(void)
1212 {
1213         struct rio_dev *rdev;
1214         int i;
1215         u8 sport;
1216
1217         list_for_each_entry(rdev, &rio_devices, global_list)
1218                 if (rio_is_switch(rdev)) {
1219                         rio_lock_device(rdev->net->hport, rdev->destid,
1220                                         rdev->hopcount, 1000);
1221                         for (i = 0;
1222                              i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1223                              i++) {
1224                                 if (rio_route_get_entry(rdev,
1225                                         RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1226                                         continue;
1227                                 rdev->rswitch->route_table[i] = sport;
1228                         }
1229
1230                         rio_unlock_device(rdev->net->hport,
1231                                           rdev->destid,
1232                                           rdev->hopcount);
1233                 }
1234 }
1235
1236 /**
1237  * rio_enum_timeout- Signal that enumeration timed out
1238  * @data: Address of timeout flag.
1239  *
1240  * When the enumeration complete timer expires, set a flag that
1241  * signals to the discovery process that enumeration did not
1242  * complete in a sane amount of time.
1243  */
1244 static void rio_enum_timeout(unsigned long data)
1245 {
1246         /* Enumeration timed out, set flag */
1247         *(int *)data = 1;
1248 }
1249
1250 /**
1251  * rio_disc_mport- Start discovery through a master port
1252  * @mport: Master port to send transactions
1253  *
1254  * Starts the discovery process. If we have an active link,
1255  * then wait for the signal that enumeration is complete.
1256  * When enumeration completion is signaled, start recursive
1257  * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1258  * on failure.
1259  */
1260 int __devinit rio_disc_mport(struct rio_mport *mport)
1261 {
1262         struct rio_net *net = NULL;
1263         int enum_timeout_flag = 0;
1264
1265         printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1266                mport->name);
1267
1268         /* If master port has an active link, allocate net and discover peers */
1269         if (rio_mport_is_active(mport)) {
1270                 if (!(net = rio_alloc_net(mport))) {
1271                         printk(KERN_ERR "RIO: Failed to allocate new net\n");
1272                         goto bail;
1273                 }
1274
1275                 pr_debug("RIO: wait for enumeration complete...");
1276
1277                 rio_enum_timer.expires =
1278                     jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1279                 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1280                 add_timer(&rio_enum_timer);
1281                 while (!rio_enum_complete(mport)) {
1282                         mdelay(1);
1283                         if (enum_timeout_flag) {
1284                                 del_timer_sync(&rio_enum_timer);
1285                                 goto timeout;
1286                         }
1287                 }
1288                 del_timer_sync(&rio_enum_timer);
1289
1290                 pr_debug("done\n");
1291
1292                 /* Read DestID assigned by enumerator */
1293                 rio_local_read_config_32(mport, RIO_DID_CSR,
1294                                          &mport->host_deviceid);
1295                 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1296                                                    mport->host_deviceid);
1297
1298                 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1299                                         0, NULL, 0) < 0) {
1300                         printk(KERN_INFO
1301                                "RIO: master port %d device has failed discovery\n",
1302                                mport->id);
1303                         goto bail;
1304                 }
1305
1306                 rio_build_route_tables();
1307         }
1308
1309         return 0;
1310
1311       timeout:
1312         pr_debug("timeout\n");
1313       bail:
1314         return -EBUSY;
1315 }