linux/drivers/rapidio/rio-scan.c
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   1/*
   2 * RapidIO enumeration and discovery support
   3 *
   4 * Copyright 2005 MontaVista Software, Inc.
   5 * Matt Porter <mporter@kernel.crashing.org>
   6 *
   7 * Copyright 2009 Integrated Device Technology, Inc.
   8 * Alex Bounine <alexandre.bounine@idt.com>
   9 * - Added Port-Write/Error Management initialization and handling
  10 *
  11 * Copyright 2009 Sysgo AG
  12 * Thomas Moll <thomas.moll@sysgo.com>
  13 * - Added Input- Output- enable functionality, to allow full communication
  14 *
  15 * This program is free software; you can redistribute  it and/or modify it
  16 * under  the terms of  the GNU General  Public License as published by the
  17 * Free Software Foundation;  either version 2 of the  License, or (at your
  18 * option) any later version.
  19 */
  20
  21#include <linux/types.h>
  22#include <linux/kernel.h>
  23
  24#include <linux/delay.h>
  25#include <linux/dma-mapping.h>
  26#include <linux/init.h>
  27#include <linux/rio.h>
  28#include <linux/rio_drv.h>
  29#include <linux/rio_ids.h>
  30#include <linux/rio_regs.h>
  31#include <linux/module.h>
  32#include <linux/spinlock.h>
  33#include <linux/timer.h>
  34#include <linux/jiffies.h>
  35#include <linux/slab.h>
  36
  37#include "rio.h"
  38
  39LIST_HEAD(rio_devices);
  40static LIST_HEAD(rio_switches);
  41
  42static void rio_enum_timeout(unsigned long);
  43
  44static void rio_init_em(struct rio_dev *rdev);
  45
  46DEFINE_SPINLOCK(rio_global_list_lock);
  47
  48static int next_destid = 0;
  49static int next_net = 0;
  50static int next_comptag = 1;
  51
  52static struct timer_list rio_enum_timer =
  53TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
  54
  55static 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 */
  72static 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 */
  90static 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 */
 103static 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 */
 117static 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 */
 165static 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 */
 196static 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 */
 211static 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 */
 228static 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 */
 244static 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 */
 280static 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 receiver 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 */
 309inline 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 */
 372static 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->dst_ops & RIO_DST_OPS_DOORBELL)
 509                rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 510                                   0, 0xffff);
 511
 512        ret = rio_add_device(rdev);
 513        if (ret)
 514                goto cleanup;
 515
 516        return rdev;
 517
 518cleanup:
 519        if (rswitch)
 520                kfree(rswitch->route_table);
 521
 522        kfree(rdev);
 523        return NULL;
 524}
 525
 526/**
 527 * rio_sport_is_active- Tests if a switch port has an active connection.
 528 * @port: Master port to send transaction
 529 * @destid: Associated destination ID for switch
 530 * @hopcount: Hopcount to reach switch
 531 * @sport: Switch port number
 532 *
 533 * Reads the port error status CSR for a particular switch port to
 534 * determine if the port has an active link.  Returns
 535 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
 536 * inactive.
 537 */
 538static int
 539rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
 540{
 541        u32 result = 0;
 542        u32 ext_ftr_ptr;
 543
 544        ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
 545
 546        while (ext_ftr_ptr) {
 547                rio_mport_read_config_32(port, destid, hopcount,
 548                                         ext_ftr_ptr, &result);
 549                result = RIO_GET_BLOCK_ID(result);
 550                if ((result == RIO_EFB_SER_EP_FREE_ID) ||
 551                    (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
 552                    (result == RIO_EFB_SER_EP_FREC_ID))
 553                        break;
 554
 555                ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
 556                                                ext_ftr_ptr);
 557        }
 558
 559        if (ext_ftr_ptr)
 560                rio_mport_read_config_32(port, destid, hopcount,
 561                                         ext_ftr_ptr +
 562                                         RIO_PORT_N_ERR_STS_CSR(sport),
 563                                         &result);
 564
 565        return result & RIO_PORT_N_ERR_STS_PORT_OK;
 566}
 567
 568/**
 569 * rio_lock_device - Acquires host device lock for specified device
 570 * @port: Master port to send transaction
 571 * @destid: Destination ID for device/switch
 572 * @hopcount: Hopcount to reach switch
 573 * @wait_ms: Max wait time in msec (0 = no timeout)
 574 *
 575 * Attepts to acquire host device lock for specified device
 576 * Returns 0 if device lock acquired or EINVAL if timeout expires.
 577 */
 578static int
 579rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
 580{
 581        u32 result;
 582        int tcnt = 0;
 583
 584        /* Attempt to acquire device lock */
 585        rio_mport_write_config_32(port, destid, hopcount,
 586                                  RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 587        rio_mport_read_config_32(port, destid, hopcount,
 588                                 RIO_HOST_DID_LOCK_CSR, &result);
 589
 590        while (result != port->host_deviceid) {
 591                if (wait_ms != 0 && tcnt == wait_ms) {
 592                        pr_debug("RIO: timeout when locking device %x:%x\n",
 593                                destid, hopcount);
 594                        return -EINVAL;
 595                }
 596
 597                /* Delay a bit */
 598                mdelay(1);
 599                tcnt++;
 600                /* Try to acquire device lock again */
 601                rio_mport_write_config_32(port, destid,
 602                        hopcount,
 603                        RIO_HOST_DID_LOCK_CSR,
 604                        port->host_deviceid);
 605                rio_mport_read_config_32(port, destid,
 606                        hopcount,
 607                        RIO_HOST_DID_LOCK_CSR, &result);
 608        }
 609
 610        return 0;
 611}
 612
 613/**
 614 * rio_unlock_device - Releases host device lock for specified device
 615 * @port: Master port to send transaction
 616 * @destid: Destination ID for device/switch
 617 * @hopcount: Hopcount to reach switch
 618 *
 619 * Returns 0 if device lock released or EINVAL if fails.
 620 */
 621static int
 622rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
 623{
 624        u32 result;
 625
 626        /* Release device lock */
 627        rio_mport_write_config_32(port, destid,
 628                                  hopcount,
 629                                  RIO_HOST_DID_LOCK_CSR,
 630                                  port->host_deviceid);
 631        rio_mport_read_config_32(port, destid, hopcount,
 632                RIO_HOST_DID_LOCK_CSR, &result);
 633        if ((result & 0xffff) != 0xffff) {
 634                pr_debug("RIO: badness when releasing device lock %x:%x\n",
 635                         destid, hopcount);
 636                return -EINVAL;
 637        }
 638
 639        return 0;
 640}
 641
 642/**
 643 * rio_route_add_entry- Add a route entry to a switch routing table
 644 * @rdev: RIO device
 645 * @table: Routing table ID
 646 * @route_destid: Destination ID to be routed
 647 * @route_port: Port number to be routed
 648 * @lock: lock switch device flag
 649 *
 650 * Calls the switch specific add_entry() method to add a route entry
 651 * on a switch. The route table can be specified using the @table
 652 * argument if a switch has per port routing tables or the normal
 653 * use is to specific all tables (or the global table) by passing
 654 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 655 * on failure.
 656 */
 657static int
 658rio_route_add_entry(struct rio_dev *rdev,
 659                    u16 table, u16 route_destid, u8 route_port, int lock)
 660{
 661        int rc;
 662
 663        if (lock) {
 664                rc = rio_lock_device(rdev->net->hport, rdev->destid,
 665                                     rdev->hopcount, 1000);
 666                if (rc)
 667                        return rc;
 668        }
 669
 670        rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
 671                                      rdev->hopcount, table,
 672                                      route_destid, route_port);
 673        if (lock)
 674                rio_unlock_device(rdev->net->hport, rdev->destid,
 675                                  rdev->hopcount);
 676
 677        return rc;
 678}
 679
 680/**
 681 * rio_route_get_entry- Read a route entry in a switch routing table
 682 * @rdev: RIO device
 683 * @table: Routing table ID
 684 * @route_destid: Destination ID to be routed
 685 * @route_port: Pointer to read port number into
 686 * @lock: lock switch device flag
 687 *
 688 * Calls the switch specific get_entry() method to read a route entry
 689 * in a switch. The route table can be specified using the @table
 690 * argument if a switch has per port routing tables or the normal
 691 * use is to specific all tables (or the global table) by passing
 692 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 693 * on failure.
 694 */
 695static int
 696rio_route_get_entry(struct rio_dev *rdev, u16 table,
 697                    u16 route_destid, u8 *route_port, int lock)
 698{
 699        int rc;
 700
 701        if (lock) {
 702                rc = rio_lock_device(rdev->net->hport, rdev->destid,
 703                                     rdev->hopcount, 1000);
 704                if (rc)
 705                        return rc;
 706        }
 707
 708        rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
 709                                      rdev->hopcount, table,
 710                                      route_destid, route_port);
 711        if (lock)
 712                rio_unlock_device(rdev->net->hport, rdev->destid,
 713                                  rdev->hopcount);
 714
 715        return rc;
 716}
 717
 718/**
 719 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
 720 * @port: Master port to send transaction
 721 * @hopcount: Number of hops to the device
 722 *
 723 * Used during enumeration to read the Host Device ID Lock CSR on a
 724 * RIO device. Returns the value of the lock register.
 725 */
 726static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
 727{
 728        u32 result;
 729
 730        rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
 731                                 RIO_HOST_DID_LOCK_CSR, &result);
 732
 733        return (u16) (result & 0xffff);
 734}
 735
 736/**
 737 * rio_enum_peer- Recursively enumerate a RIO network through a master port
 738 * @net: RIO network being enumerated
 739 * @port: Master port to send transactions
 740 * @hopcount: Number of hops into the network
 741 * @prev: Previous RIO device connected to the enumerated one
 742 * @prev_port: Port on previous RIO device
 743 *
 744 * Recursively enumerates a RIO network.  Transactions are sent via the
 745 * master port passed in @port.
 746 */
 747static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 748                         u8 hopcount, struct rio_dev *prev, int prev_port)
 749{
 750        int port_num;
 751        int cur_destid;
 752        int sw_destid;
 753        int sw_inport;
 754        struct rio_dev *rdev;
 755        u16 destid;
 756        u32 regval;
 757        int tmp;
 758
 759        if (rio_mport_chk_dev_access(port,
 760                        RIO_ANY_DESTID(port->sys_size), hopcount)) {
 761                pr_debug("RIO: device access check failed\n");
 762                return -1;
 763        }
 764
 765        if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 766                pr_debug("RIO: PE already discovered by this host\n");
 767                /*
 768                 * Already discovered by this host. Add it as another
 769                 * link to the existing device.
 770                 */
 771                rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
 772                                hopcount, RIO_COMPONENT_TAG_CSR, &regval);
 773
 774                if (regval) {
 775                        rdev = rio_get_comptag((regval & 0xffff), NULL);
 776
 777                        if (rdev && prev && rio_is_switch(prev)) {
 778                                pr_debug("RIO: redundant path to %s\n",
 779                                         rio_name(rdev));
 780                                prev->rswitch->nextdev[prev_port] = rdev;
 781                        }
 782                }
 783
 784                return 0;
 785        }
 786
 787        /* Attempt to acquire device lock */
 788        rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 789                                  hopcount,
 790                                  RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 791        while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
 792               < port->host_deviceid) {
 793                /* Delay a bit */
 794                mdelay(1);
 795                /* Attempt to acquire device lock again */
 796                rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 797                                          hopcount,
 798                                          RIO_HOST_DID_LOCK_CSR,
 799                                          port->host_deviceid);
 800        }
 801
 802        if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
 803                pr_debug(
 804                    "RIO: PE locked by a higher priority host...retreating\n");
 805                return -1;
 806        }
 807
 808        /* Setup new RIO device */
 809        rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
 810                                        hopcount, 1);
 811        if (rdev) {
 812                /* Add device to the global and bus/net specific list. */
 813                list_add_tail(&rdev->net_list, &net->devices);
 814                rdev->prev = prev;
 815                if (prev && rio_is_switch(prev))
 816                        prev->rswitch->nextdev[prev_port] = rdev;
 817        } else
 818                return -1;
 819
 820        if (rio_is_switch(rdev)) {
 821                sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
 822                rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 823                                    port->host_deviceid, sw_inport, 0);
 824                rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
 825
 826                for (destid = 0; destid < next_destid; destid++) {
 827                        if (destid == port->host_deviceid)
 828                                continue;
 829                        rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 830                                            destid, sw_inport, 0);
 831                        rdev->rswitch->route_table[destid] = sw_inport;
 832                }
 833
 834                pr_debug(
 835                    "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 836                    rio_name(rdev), rdev->vid, rdev->did,
 837                    RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 838                sw_destid = next_destid;
 839                for (port_num = 0;
 840                     port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 841                     port_num++) {
 842                        /*Enable Input Output Port (transmitter reviever)*/
 843                        rio_enable_rx_tx_port(port, 0,
 844                                              RIO_ANY_DESTID(port->sys_size),
 845                                              hopcount, port_num);
 846
 847                        if (sw_inport == port_num) {
 848                                rdev->rswitch->port_ok |= (1 << port_num);
 849                                continue;
 850                        }
 851
 852                        cur_destid = next_destid;
 853
 854                        if (rio_sport_is_active
 855                            (port, RIO_ANY_DESTID(port->sys_size), hopcount,
 856                             port_num)) {
 857                                pr_debug(
 858                                    "RIO: scanning device on port %d\n",
 859                                    port_num);
 860                                rdev->rswitch->port_ok |= (1 << port_num);
 861                                rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 862                                                RIO_ANY_DESTID(port->sys_size),
 863                                                port_num, 0);
 864
 865                                if (rio_enum_peer(net, port, hopcount + 1,
 866                                                  rdev, port_num) < 0)
 867                                        return -1;
 868
 869                                /* Update routing tables */
 870                                if (next_destid > cur_destid) {
 871                                        for (destid = cur_destid;
 872                                             destid < next_destid; destid++) {
 873                                                if (destid == port->host_deviceid)
 874                                                        continue;
 875                                                rio_route_add_entry(rdev,
 876                                                                    RIO_GLOBAL_TABLE,
 877                                                                    destid,
 878                                                                    port_num,
 879                                                                    0);
 880                                                rdev->rswitch->
 881                                                    route_table[destid] =
 882                                                    port_num;
 883                                        }
 884                                }
 885                        } else {
 886                                /* If switch supports Error Management,
 887                                 * set PORT_LOCKOUT bit for unused port
 888                                 */
 889                                if (rdev->em_efptr)
 890                                        rio_set_port_lockout(rdev, port_num, 1);
 891
 892                                rdev->rswitch->port_ok &= ~(1 << port_num);
 893                        }
 894                }
 895
 896                /* Direct Port-write messages to the enumeratiing host */
 897                if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
 898                    (rdev->em_efptr)) {
 899                        rio_write_config_32(rdev,
 900                                        rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
 901                                        (port->host_deviceid << 16) |
 902                                        (port->sys_size << 15));
 903                }
 904
 905                rio_init_em(rdev);
 906
 907                /* Check for empty switch */
 908                if (next_destid == sw_destid) {
 909                        next_destid++;
 910                        if (next_destid == port->host_deviceid)
 911                                next_destid++;
 912                }
 913
 914                rdev->destid = sw_destid;
 915        } else
 916                pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 917                    rio_name(rdev), rdev->vid, rdev->did);
 918
 919        return 0;
 920}
 921
 922/**
 923 * rio_enum_complete- Tests if enumeration of a network is complete
 924 * @port: Master port to send transaction
 925 *
 926 * Tests the PGCCSR discovered bit for non-zero value (enumeration
 927 * complete flag). Return %1 if enumeration is complete or %0 if
 928 * enumeration is incomplete.
 929 */
 930static int rio_enum_complete(struct rio_mport *port)
 931{
 932        u32 regval;
 933
 934        rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 935                                 &regval);
 936        return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
 937}
 938
 939/**
 940 * rio_disc_peer- Recursively discovers a RIO network through a master port
 941 * @net: RIO network being discovered
 942 * @port: Master port to send transactions
 943 * @destid: Current destination ID in network
 944 * @hopcount: Number of hops into the network
 945 * @prev: previous rio_dev
 946 * @prev_port: previous port number
 947 *
 948 * Recursively discovers a RIO network.  Transactions are sent via the
 949 * master port passed in @port.
 950 */
 951static int __devinit
 952rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
 953              u8 hopcount, struct rio_dev *prev, int prev_port)
 954{
 955        u8 port_num, route_port;
 956        struct rio_dev *rdev;
 957        u16 ndestid;
 958
 959        /* Setup new RIO device */
 960        if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
 961                /* Add device to the global and bus/net specific list. */
 962                list_add_tail(&rdev->net_list, &net->devices);
 963                rdev->prev = prev;
 964                if (prev && rio_is_switch(prev))
 965                        prev->rswitch->nextdev[prev_port] = rdev;
 966        } else
 967                return -1;
 968
 969        if (rio_is_switch(rdev)) {
 970                /* Associated destid is how we accessed this switch */
 971                rdev->destid = destid;
 972
 973                pr_debug(
 974                    "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 975                    rio_name(rdev), rdev->vid, rdev->did,
 976                    RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 977                for (port_num = 0;
 978                     port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 979                     port_num++) {
 980                        if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
 981                                continue;
 982
 983                        if (rio_sport_is_active
 984                            (port, destid, hopcount, port_num)) {
 985                                pr_debug(
 986                                    "RIO: scanning device on port %d\n",
 987                                    port_num);
 988
 989                                rio_lock_device(port, destid, hopcount, 1000);
 990
 991                                for (ndestid = 0;
 992                                     ndestid < RIO_ANY_DESTID(port->sys_size);
 993                                     ndestid++) {
 994                                        rio_route_get_entry(rdev,
 995                                                            RIO_GLOBAL_TABLE,
 996                                                            ndestid,
 997                                                            &route_port, 0);
 998                                        if (route_port == port_num)
 999                                                break;
1000                                }
1001
1002                                if (ndestid == RIO_ANY_DESTID(port->sys_size))
1003                                        continue;
1004                                rio_unlock_device(port, destid, hopcount);
1005                                if (rio_disc_peer(net, port, ndestid,
1006                                        hopcount + 1, rdev, port_num) < 0)
1007                                        return -1;
1008                        }
1009                }
1010        } else
1011                pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1012                    rio_name(rdev), rdev->vid, rdev->did);
1013
1014        return 0;
1015}
1016
1017/**
1018 * rio_mport_is_active- Tests if master port link is active
1019 * @port: Master port to test
1020 *
1021 * Reads the port error status CSR for the master port to
1022 * determine if the port has an active link.  Returns
1023 * %RIO_PORT_N_ERR_STS_PORT_OK if the  master port is active
1024 * or %0 if it is inactive.
1025 */
1026static int rio_mport_is_active(struct rio_mport *port)
1027{
1028        u32 result = 0;
1029        u32 ext_ftr_ptr;
1030        int *entry = rio_mport_phys_table;
1031
1032        do {
1033                if ((ext_ftr_ptr =
1034                     rio_mport_get_feature(port, 1, 0, 0, *entry)))
1035                        break;
1036        } while (*++entry >= 0);
1037
1038        if (ext_ftr_ptr)
1039                rio_local_read_config_32(port,
1040                                         ext_ftr_ptr +
1041                                         RIO_PORT_N_ERR_STS_CSR(port->index),
1042                                         &result);
1043
1044        return result & RIO_PORT_N_ERR_STS_PORT_OK;
1045}
1046
1047/**
1048 * rio_alloc_net- Allocate and configure a new RIO network
1049 * @port: Master port associated with the RIO network
1050 *
1051 * Allocates a RIO network structure, initializes per-network
1052 * list heads, and adds the associated master port to the
1053 * network list of associated master ports. Returns a
1054 * RIO network pointer on success or %NULL on failure.
1055 */
1056static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1057{
1058        struct rio_net *net;
1059
1060        net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1061        if (net) {
1062                INIT_LIST_HEAD(&net->node);
1063                INIT_LIST_HEAD(&net->devices);
1064                INIT_LIST_HEAD(&net->mports);
1065                list_add_tail(&port->nnode, &net->mports);
1066                net->hport = port;
1067                net->id = next_net++;
1068        }
1069        return net;
1070}
1071
1072/**
1073 * rio_update_route_tables- Updates route tables in switches
1074 * @port: Master port associated with the RIO network
1075 *
1076 * For each enumerated device, ensure that each switch in a system
1077 * has correct routing entries. Add routes for devices that where
1078 * unknown dirung the first enumeration pass through the switch.
1079 */
1080static void rio_update_route_tables(struct rio_mport *port)
1081{
1082        struct rio_dev *rdev, *swrdev;
1083        struct rio_switch *rswitch;
1084        u8 sport;
1085        u16 destid;
1086
1087        list_for_each_entry(rdev, &rio_devices, global_list) {
1088
1089                destid = rdev->destid;
1090
1091                list_for_each_entry(rswitch, &rio_switches, node) {
1092
1093                        if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1094                                continue;
1095
1096                        if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1097                                swrdev = sw_to_rio_dev(rswitch);
1098
1099                                /* Skip if destid ends in empty switch*/
1100                                if (swrdev->destid == destid)
1101                                        continue;
1102
1103                                sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1104
1105                                if (rswitch->add_entry) {
1106                                        rio_route_add_entry(swrdev,
1107                                                RIO_GLOBAL_TABLE, destid,
1108                                                sport, 0);
1109                                        rswitch->route_table[destid] = sport;
1110                                }
1111                        }
1112                }
1113        }
1114}
1115
1116/**
1117 * rio_init_em - Initializes RIO Error Management (for switches)
1118 * @rdev: RIO device
1119 *
1120 * For each enumerated switch, call device-specific error management
1121 * initialization routine (if supplied by the switch driver).
1122 */
1123static void rio_init_em(struct rio_dev *rdev)
1124{
1125        if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1126            (rdev->rswitch->em_init)) {
1127                rdev->rswitch->em_init(rdev);
1128        }
1129}
1130
1131/**
1132 * rio_pw_enable - Enables/disables port-write handling by a master port
1133 * @port: Master port associated with port-write handling
1134 * @enable:  1=enable,  0=disable
1135 */
1136static void rio_pw_enable(struct rio_mport *port, int enable)
1137{
1138        if (port->ops->pwenable)
1139                port->ops->pwenable(port, enable);
1140}
1141
1142/**
1143 * rio_enum_mport- Start enumeration through a master port
1144 * @mport: Master port to send transactions
1145 *
1146 * Starts the enumeration process. If somebody has enumerated our
1147 * master port device, then give up. If not and we have an active
1148 * link, then start recursive peer enumeration. Returns %0 if
1149 * enumeration succeeds or %-EBUSY if enumeration fails.
1150 */
1151int __devinit rio_enum_mport(struct rio_mport *mport)
1152{
1153        struct rio_net *net = NULL;
1154        int rc = 0;
1155
1156        printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1157               mport->name);
1158        /* If somebody else enumerated our master port device, bail. */
1159        if (rio_enum_host(mport) < 0) {
1160                printk(KERN_INFO
1161                       "RIO: master port %d device has been enumerated by a remote host\n",
1162                       mport->id);
1163                rc = -EBUSY;
1164                goto out;
1165        }
1166
1167        /* If master port has an active link, allocate net and enum peers */
1168        if (rio_mport_is_active(mport)) {
1169                if (!(net = rio_alloc_net(mport))) {
1170                        printk(KERN_ERR "RIO: failed to allocate new net\n");
1171                        rc = -ENOMEM;
1172                        goto out;
1173                }
1174
1175                /* Enable Input Output Port (transmitter reviever) */
1176                rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1177
1178                /* Set component tag for host */
1179                rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1180                                          next_comptag++);
1181
1182                if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1183                        /* A higher priority host won enumeration, bail. */
1184                        printk(KERN_INFO
1185                               "RIO: master port %d device has lost enumeration to a remote host\n",
1186                               mport->id);
1187                        rio_clear_locks(mport);
1188                        rc = -EBUSY;
1189                        goto out;
1190                }
1191                rio_update_route_tables(mport);
1192                rio_clear_locks(mport);
1193                rio_pw_enable(mport, 1);
1194        } else {
1195                printk(KERN_INFO "RIO: master port %d link inactive\n",
1196                       mport->id);
1197                rc = -EINVAL;
1198        }
1199
1200      out:
1201        return rc;
1202}
1203
1204/**
1205 * rio_build_route_tables- Generate route tables from switch route entries
1206 *
1207 * For each switch device, generate a route table by copying existing
1208 * route entries from the switch.
1209 */
1210static void rio_build_route_tables(void)
1211{
1212        struct rio_dev *rdev;
1213        int i;
1214        u8 sport;
1215
1216        list_for_each_entry(rdev, &rio_devices, global_list)
1217                if (rio_is_switch(rdev)) {
1218                        rio_lock_device(rdev->net->hport, rdev->destid,
1219                                        rdev->hopcount, 1000);
1220                        for (i = 0;
1221                             i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1222                             i++) {
1223                                if (rio_route_get_entry(rdev,
1224                                        RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1225                                        continue;
1226                                rdev->rswitch->route_table[i] = sport;
1227                        }
1228
1229                        rio_unlock_device(rdev->net->hport,
1230                                          rdev->destid,
1231                                          rdev->hopcount);
1232                }
1233}
1234
1235/**
1236 * rio_enum_timeout- Signal that enumeration timed out
1237 * @data: Address of timeout flag.
1238 *
1239 * When the enumeration complete timer expires, set a flag that
1240 * signals to the discovery process that enumeration did not
1241 * complete in a sane amount of time.
1242 */
1243static void rio_enum_timeout(unsigned long data)
1244{
1245        /* Enumeration timed out, set flag */
1246        *(int *)data = 1;
1247}
1248
1249/**
1250 * rio_disc_mport- Start discovery through a master port
1251 * @mport: Master port to send transactions
1252 *
1253 * Starts the discovery process. If we have an active link,
1254 * then wait for the signal that enumeration is complete.
1255 * When enumeration completion is signaled, start recursive
1256 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1257 * on failure.
1258 */
1259int __devinit rio_disc_mport(struct rio_mport *mport)
1260{
1261        struct rio_net *net = NULL;
1262        int enum_timeout_flag = 0;
1263
1264        printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1265               mport->name);
1266
1267        /* If master port has an active link, allocate net and discover peers */
1268        if (rio_mport_is_active(mport)) {
1269                if (!(net = rio_alloc_net(mport))) {
1270                        printk(KERN_ERR "RIO: Failed to allocate new net\n");
1271                        goto bail;
1272                }
1273
1274                pr_debug("RIO: wait for enumeration complete...");
1275
1276                rio_enum_timer.expires =
1277                    jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1278                rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1279                add_timer(&rio_enum_timer);
1280                while (!rio_enum_complete(mport)) {
1281                        mdelay(1);
1282                        if (enum_timeout_flag) {
1283                                del_timer_sync(&rio_enum_timer);
1284                                goto timeout;
1285                        }
1286                }
1287                del_timer_sync(&rio_enum_timer);
1288
1289                pr_debug("done\n");
1290
1291                /* Read DestID assigned by enumerator */
1292                rio_local_read_config_32(mport, RIO_DID_CSR,
1293                                         &mport->host_deviceid);
1294                mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1295                                                   mport->host_deviceid);
1296
1297                if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1298                                        0, NULL, 0) < 0) {
1299                        printk(KERN_INFO
1300                               "RIO: master port %d device has failed discovery\n",
1301                               mport->id);
1302                        goto bail;
1303                }
1304
1305                rio_build_route_tables();
1306        }
1307
1308        return 0;
1309
1310      timeout:
1311        pr_debug("timeout\n");
1312      bail:
1313        return -EBUSY;
1314}
1315
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