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/sched.h>
  35#include <linux/jiffies.h>
  36#include <linux/slab.h>
  37
  38#include "rio.h"
  39
  40LIST_HEAD(rio_devices);
  41
  42static void rio_init_em(struct rio_dev *rdev);
  43
  44DEFINE_SPINLOCK(rio_global_list_lock);
  45
  46static int next_destid = 0;
  47static int next_comptag = 1;
  48
  49static int rio_mport_phys_table[] = {
  50        RIO_EFB_PAR_EP_ID,
  51        RIO_EFB_PAR_EP_REC_ID,
  52        RIO_EFB_SER_EP_ID,
  53        RIO_EFB_SER_EP_REC_ID,
  54        -1,
  55};
  56
  57
  58/**
  59 * rio_destid_alloc - Allocate next available destID for given network
  60 * @net: RIO network
  61 *
  62 * Returns next available device destination ID for the specified RIO network.
  63 * Marks allocated ID as one in use.
  64 * Returns RIO_INVALID_DESTID if new destID is not available.
  65 */
  66static u16 rio_destid_alloc(struct rio_net *net)
  67{
  68        int destid;
  69        struct rio_id_table *idtab = &net->destid_table;
  70
  71        spin_lock(&idtab->lock);
  72        destid = find_first_zero_bit(idtab->table, idtab->max);
  73
  74        if (destid < idtab->max) {
  75                set_bit(destid, idtab->table);
  76                destid += idtab->start;
  77        } else
  78                destid = RIO_INVALID_DESTID;
  79
  80        spin_unlock(&idtab->lock);
  81        return (u16)destid;
  82}
  83
  84/**
  85 * rio_destid_reserve - Reserve the specivied destID
  86 * @net: RIO network
  87 * @destid: destID to reserve
  88 *
  89 * Tries to reserve the specified destID.
  90 * Returns 0 if successfull.
  91 */
  92static int rio_destid_reserve(struct rio_net *net, u16 destid)
  93{
  94        int oldbit;
  95        struct rio_id_table *idtab = &net->destid_table;
  96
  97        destid -= idtab->start;
  98        spin_lock(&idtab->lock);
  99        oldbit = test_and_set_bit(destid, idtab->table);
 100        spin_unlock(&idtab->lock);
 101        return oldbit;
 102}
 103
 104/**
 105 * rio_destid_free - free a previously allocated destID
 106 * @net: RIO network
 107 * @destid: destID to free
 108 *
 109 * Makes the specified destID available for use.
 110 */
 111static void rio_destid_free(struct rio_net *net, u16 destid)
 112{
 113        struct rio_id_table *idtab = &net->destid_table;
 114
 115        destid -= idtab->start;
 116        spin_lock(&idtab->lock);
 117        clear_bit(destid, idtab->table);
 118        spin_unlock(&idtab->lock);
 119}
 120
 121/**
 122 * rio_destid_first - return first destID in use
 123 * @net: RIO network
 124 */
 125static u16 rio_destid_first(struct rio_net *net)
 126{
 127        int destid;
 128        struct rio_id_table *idtab = &net->destid_table;
 129
 130        spin_lock(&idtab->lock);
 131        destid = find_first_bit(idtab->table, idtab->max);
 132        if (destid >= idtab->max)
 133                destid = RIO_INVALID_DESTID;
 134        else
 135                destid += idtab->start;
 136        spin_unlock(&idtab->lock);
 137        return (u16)destid;
 138}
 139
 140/**
 141 * rio_destid_next - return next destID in use
 142 * @net: RIO network
 143 * @from: destination ID from which search shall continue
 144 */
 145static u16 rio_destid_next(struct rio_net *net, u16 from)
 146{
 147        int destid;
 148        struct rio_id_table *idtab = &net->destid_table;
 149
 150        spin_lock(&idtab->lock);
 151        destid = find_next_bit(idtab->table, idtab->max, from);
 152        if (destid >= idtab->max)
 153                destid = RIO_INVALID_DESTID;
 154        else
 155                destid += idtab->start;
 156        spin_unlock(&idtab->lock);
 157        return (u16)destid;
 158}
 159
 160/**
 161 * rio_get_device_id - Get the base/extended device id for a device
 162 * @port: RIO master port
 163 * @destid: Destination ID of device
 164 * @hopcount: Hopcount to device
 165 *
 166 * Reads the base/extended device id from a device. Returns the
 167 * 8/16-bit device ID.
 168 */
 169static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
 170{
 171        u32 result;
 172
 173        rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
 174
 175        return RIO_GET_DID(port->sys_size, result);
 176}
 177
 178/**
 179 * rio_set_device_id - Set the base/extended device id for a device
 180 * @port: RIO master port
 181 * @destid: Destination ID of device
 182 * @hopcount: Hopcount to device
 183 * @did: Device ID value to be written
 184 *
 185 * Writes the base/extended device id from a device.
 186 */
 187static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
 188{
 189        rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
 190                                  RIO_SET_DID(port->sys_size, did));
 191}
 192
 193/**
 194 * rio_local_set_device_id - Set the base/extended device id for a port
 195 * @port: RIO master port
 196 * @did: Device ID value to be written
 197 *
 198 * Writes the base/extended device id from a device.
 199 */
 200static void rio_local_set_device_id(struct rio_mport *port, u16 did)
 201{
 202        rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
 203                                did));
 204}
 205
 206/**
 207 * rio_clear_locks- Release all host locks and signal enumeration complete
 208 * @net: RIO network to run on
 209 *
 210 * Marks the component tag CSR on each device with the enumeration
 211 * complete flag. When complete, it then release the host locks on
 212 * each device. Returns 0 on success or %-EINVAL on failure.
 213 */
 214static int rio_clear_locks(struct rio_net *net)
 215{
 216        struct rio_mport *port = net->hport;
 217        struct rio_dev *rdev;
 218        u32 result;
 219        int ret = 0;
 220
 221        /* Release host device id locks */
 222        rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 223                                  port->host_deviceid);
 224        rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 225        if ((result & 0xffff) != 0xffff) {
 226                printk(KERN_INFO
 227                       "RIO: badness when releasing host lock on master port, result %8.8x\n",
 228                       result);
 229                ret = -EINVAL;
 230        }
 231        list_for_each_entry(rdev, &net->devices, net_list) {
 232                rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
 233                                    port->host_deviceid);
 234                rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
 235                if ((result & 0xffff) != 0xffff) {
 236                        printk(KERN_INFO
 237                               "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
 238                               rdev->vid, rdev->did);
 239                        ret = -EINVAL;
 240                }
 241
 242                /* Mark device as discovered and enable master */
 243                rio_read_config_32(rdev,
 244                                   rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 245                                   &result);
 246                result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
 247                rio_write_config_32(rdev,
 248                                    rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 249                                    result);
 250        }
 251
 252        return ret;
 253}
 254
 255/**
 256 * rio_enum_host- Set host lock and initialize host destination ID
 257 * @port: Master port to issue transaction
 258 *
 259 * Sets the local host master port lock and destination ID register
 260 * with the host device ID value. The host device ID value is provided
 261 * by the platform. Returns %0 on success or %-1 on failure.
 262 */
 263static int rio_enum_host(struct rio_mport *port)
 264{
 265        u32 result;
 266
 267        /* Set master port host device id lock */
 268        rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 269                                  port->host_deviceid);
 270
 271        rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 272        if ((result & 0xffff) != port->host_deviceid)
 273                return -1;
 274
 275        /* Set master port destid and init destid ctr */
 276        rio_local_set_device_id(port, port->host_deviceid);
 277        return 0;
 278}
 279
 280/**
 281 * rio_device_has_destid- Test if a device contains a destination ID register
 282 * @port: Master port to issue transaction
 283 * @src_ops: RIO device source operations
 284 * @dst_ops: RIO device destination operations
 285 *
 286 * Checks the provided @src_ops and @dst_ops for the necessary transaction
 287 * capabilities that indicate whether or not a device will implement a
 288 * destination ID register. Returns 1 if true or 0 if false.
 289 */
 290static int rio_device_has_destid(struct rio_mport *port, int src_ops,
 291                                 int dst_ops)
 292{
 293        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;
 294
 295        return !!((src_ops | dst_ops) & mask);
 296}
 297
 298/**
 299 * rio_release_dev- Frees a RIO device struct
 300 * @dev: LDM device associated with a RIO device struct
 301 *
 302 * Gets the RIO device struct associated a RIO device struct.
 303 * The RIO device struct is freed.
 304 */
 305static void rio_release_dev(struct device *dev)
 306{
 307        struct rio_dev *rdev;
 308
 309        rdev = to_rio_dev(dev);
 310        kfree(rdev);
 311}
 312
 313/**
 314 * rio_is_switch- Tests if a RIO device has switch capabilities
 315 * @rdev: RIO device
 316 *
 317 * Gets the RIO device Processing Element Features register
 318 * contents and tests for switch capabilities. Returns 1 if
 319 * the device is a switch or 0 if it is not a switch.
 320 * The RIO device struct is freed.
 321 */
 322static int rio_is_switch(struct rio_dev *rdev)
 323{
 324        if (rdev->pef & RIO_PEF_SWITCH)
 325                return 1;
 326        return 0;
 327}
 328
 329/**
 330 * rio_switch_init - Sets switch operations for a particular vendor switch
 331 * @rdev: RIO device
 332 * @do_enum: Enumeration/Discovery mode flag
 333 *
 334 * Searches the RIO switch ops table for known switch types. If the vid
 335 * and did match a switch table entry, then call switch initialization
 336 * routine to setup switch-specific routines.
 337 */
 338static void rio_switch_init(struct rio_dev *rdev, int do_enum)
 339{
 340        struct rio_switch_ops *cur = __start_rio_switch_ops;
 341        struct rio_switch_ops *end = __end_rio_switch_ops;
 342
 343        while (cur < end) {
 344                if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
 345                        pr_debug("RIO: calling init routine for %s\n",
 346                                 rio_name(rdev));
 347                        cur->init_hook(rdev, do_enum);
 348                        break;
 349                }
 350                cur++;
 351        }
 352
 353        if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
 354                pr_debug("RIO: adding STD routing ops for %s\n",
 355                        rio_name(rdev));
 356                rdev->rswitch->add_entry = rio_std_route_add_entry;
 357                rdev->rswitch->get_entry = rio_std_route_get_entry;
 358                rdev->rswitch->clr_table = rio_std_route_clr_table;
 359        }
 360
 361        if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
 362                printk(KERN_ERR "RIO: missing routing ops for %s\n",
 363                       rio_name(rdev));
 364}
 365
 366/**
 367 * rio_add_device- Adds a RIO device to the device model
 368 * @rdev: RIO device
 369 *
 370 * Adds the RIO device to the global device list and adds the RIO
 371 * device to the RIO device list.  Creates the generic sysfs nodes
 372 * for an RIO device.
 373 */
 374static int __devinit rio_add_device(struct rio_dev *rdev)
 375{
 376        int err;
 377
 378        err = device_add(&rdev->dev);
 379        if (err)
 380                return err;
 381
 382        spin_lock(&rio_global_list_lock);
 383        list_add_tail(&rdev->global_list, &rio_devices);
 384        spin_unlock(&rio_global_list_lock);
 385
 386        rio_create_sysfs_dev_files(rdev);
 387
 388        return 0;
 389}
 390
 391/**
 392 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
 393 * given port
 394 * @port: Master port associated with the RIO network
 395 * @local: local=1 select local port otherwise a far device is reached
 396 * @destid: Destination ID of the device to check host bit
 397 * @hopcount: Number of hops to reach the target
 398 * @port_num: Port (-number on switch) to enable on a far end device
 399 *
 400 * Returns 0 or 1 from on General Control Command and Status Register
 401 * (EXT_PTR+0x3C)
 402 */
 403inline int rio_enable_rx_tx_port(struct rio_mport *port,
 404                                 int local, u16 destid,
 405                                 u8 hopcount, u8 port_num) {
 406#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
 407        u32 regval;
 408        u32 ext_ftr_ptr;
 409
 410        /*
 411        * enable rx input tx output port
 412        */
 413        pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
 414                 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
 415
 416        ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
 417
 418        if (local) {
 419                rio_local_read_config_32(port, ext_ftr_ptr +
 420                                RIO_PORT_N_CTL_CSR(0),
 421                                &regval);
 422        } else {
 423                if (rio_mport_read_config_32(port, destid, hopcount,
 424                ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 0)
 425                        return -EIO;
 426        }
 427
 428        if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
 429                /* serial */
 430                regval = regval | RIO_PORT_N_CTL_EN_RX_SER
 431                                | RIO_PORT_N_CTL_EN_TX_SER;
 432        } else {
 433                /* parallel */
 434                regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
 435                                | RIO_PORT_N_CTL_EN_TX_PAR;
 436        }
 437
 438        if (local) {
 439                rio_local_write_config_32(port, ext_ftr_ptr +
 440                                          RIO_PORT_N_CTL_CSR(0), regval);
 441        } else {
 442                if (rio_mport_write_config_32(port, destid, hopcount,
 443                    ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
 444                        return -EIO;
 445        }
 446#endif
 447        return 0;
 448}
 449
 450/**
 451 * rio_setup_device- Allocates and sets up a RIO device
 452 * @net: RIO network
 453 * @port: Master port to send transactions
 454 * @destid: Current destination ID
 455 * @hopcount: Current hopcount
 456 * @do_enum: Enumeration/Discovery mode flag
 457 *
 458 * Allocates a RIO device and configures fields based on configuration
 459 * space contents. If device has a destination ID register, a destination
 460 * ID is either assigned in enumeration mode or read from configuration
 461 * space in discovery mode.  If the device has switch capabilities, then
 462 * a switch is allocated and configured appropriately. Returns a pointer
 463 * to a RIO device on success or NULL on failure.
 464 *
 465 */
 466static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
 467                                        struct rio_mport *port, u16 destid,
 468                                        u8 hopcount, int do_enum)
 469{
 470        int ret = 0;
 471        struct rio_dev *rdev;
 472        struct rio_switch *rswitch = NULL;
 473        int result, rdid;
 474        size_t size;
 475        u32 swpinfo = 0;
 476
 477        size = sizeof(struct rio_dev);
 478        if (rio_mport_read_config_32(port, destid, hopcount,
 479                                     RIO_PEF_CAR, &result))
 480                return NULL;
 481
 482        if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
 483                rio_mport_read_config_32(port, destid, hopcount,
 484                                         RIO_SWP_INFO_CAR, &swpinfo);
 485                if (result & RIO_PEF_SWITCH) {
 486                        size += (RIO_GET_TOTAL_PORTS(swpinfo) *
 487                                sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
 488                }
 489        }
 490
 491        rdev = kzalloc(size, GFP_KERNEL);
 492        if (!rdev)
 493                return NULL;
 494
 495        rdev->net = net;
 496        rdev->pef = result;
 497        rdev->swpinfo = swpinfo;
 498        rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
 499                                 &result);
 500        rdev->did = result >> 16;
 501        rdev->vid = result & 0xffff;
 502        rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
 503                                 &rdev->device_rev);
 504        rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
 505                                 &result);
 506        rdev->asm_did = result >> 16;
 507        rdev->asm_vid = result & 0xffff;
 508        rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
 509                                 &result);
 510        rdev->asm_rev = result >> 16;
 511        if (rdev->pef & RIO_PEF_EXT_FEATURES) {
 512                rdev->efptr = result & 0xffff;
 513                rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
 514                                                         hopcount);
 515
 516                rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
 517                                                hopcount, RIO_EFB_ERR_MGMNT);
 518        }
 519
 520        rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
 521                                 &rdev->src_ops);
 522        rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
 523                                 &rdev->dst_ops);
 524
 525        if (do_enum) {
 526                /* Assign component tag to device */
 527                if (next_comptag >= 0x10000) {
 528                        pr_err("RIO: Component Tag Counter Overflow\n");
 529                        goto cleanup;
 530                }
 531                rio_mport_write_config_32(port, destid, hopcount,
 532                                          RIO_COMPONENT_TAG_CSR, next_comptag);
 533                rdev->comp_tag = next_comptag++;
 534        }  else {
 535                rio_mport_read_config_32(port, destid, hopcount,
 536                                         RIO_COMPONENT_TAG_CSR,
 537                                         &rdev->comp_tag);
 538        }
 539
 540        if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
 541                if (do_enum) {
 542                        rio_set_device_id(port, destid, hopcount, next_destid);
 543                        rdev->destid = next_destid;
 544                        next_destid = rio_destid_alloc(net);
 545                } else
 546                        rdev->destid = rio_get_device_id(port, destid, hopcount);
 547
 548                rdev->hopcount = 0xff;
 549        } else {
 550                /* Switch device has an associated destID which
 551                 * will be adjusted later
 552                 */
 553                rdev->destid = destid;
 554                rdev->hopcount = hopcount;
 555        }
 556
 557        /* If a PE has both switch and other functions, show it as a switch */
 558        if (rio_is_switch(rdev)) {
 559                rswitch = rdev->rswitch;
 560                rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID;
 561                rswitch->port_ok = 0;
 562                rswitch->route_table = kzalloc(sizeof(u8)*
 563                                        RIO_MAX_ROUTE_ENTRIES(port->sys_size),
 564                                        GFP_KERNEL);
 565                if (!rswitch->route_table)
 566                        goto cleanup;
 567                /* Initialize switch route table */
 568                for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
 569                                rdid++)
 570                        rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
 571                dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
 572                             rswitch->switchid);
 573                rio_switch_init(rdev, do_enum);
 574
 575                if (do_enum && rswitch->clr_table)
 576                        rswitch->clr_table(port, destid, hopcount,
 577                                           RIO_GLOBAL_TABLE);
 578
 579                list_add_tail(&rswitch->node, &net->switches);
 580
 581        } else {
 582                if (do_enum)
 583                        /*Enable Input Output Port (transmitter reviever)*/
 584                        rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
 585
 586                dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
 587                             rdev->destid);
 588        }
 589
 590        rdev->dev.bus = &rio_bus_type;
 591        rdev->dev.parent = &rio_bus;
 592
 593        device_initialize(&rdev->dev);
 594        rdev->dev.release = rio_release_dev;
 595        rio_dev_get(rdev);
 596
 597        rdev->dma_mask = DMA_BIT_MASK(32);
 598        rdev->dev.dma_mask = &rdev->dma_mask;
 599        rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 600
 601        if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
 602                rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 603                                   0, 0xffff);
 604
 605        ret = rio_add_device(rdev);
 606        if (ret)
 607                goto cleanup;
 608
 609        return rdev;
 610
 611cleanup:
 612        if (rswitch)
 613                kfree(rswitch->route_table);
 614
 615        kfree(rdev);
 616        return NULL;
 617}
 618
 619/**
 620 * rio_sport_is_active- Tests if a switch port has an active connection.
 621 * @port: Master port to send transaction
 622 * @destid: Associated destination ID for switch
 623 * @hopcount: Hopcount to reach switch
 624 * @sport: Switch port number
 625 *
 626 * Reads the port error status CSR for a particular switch port to
 627 * determine if the port has an active link.  Returns
 628 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
 629 * inactive.
 630 */
 631static int
 632rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
 633{
 634        u32 result = 0;
 635        u32 ext_ftr_ptr;
 636
 637        ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
 638
 639        while (ext_ftr_ptr) {
 640                rio_mport_read_config_32(port, destid, hopcount,
 641                                         ext_ftr_ptr, &result);
 642                result = RIO_GET_BLOCK_ID(result);
 643                if ((result == RIO_EFB_SER_EP_FREE_ID) ||
 644                    (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
 645                    (result == RIO_EFB_SER_EP_FREC_ID))
 646                        break;
 647
 648                ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
 649                                                ext_ftr_ptr);
 650        }
 651
 652        if (ext_ftr_ptr)
 653                rio_mport_read_config_32(port, destid, hopcount,
 654                                         ext_ftr_ptr +
 655                                         RIO_PORT_N_ERR_STS_CSR(sport),
 656                                         &result);
 657
 658        return result & RIO_PORT_N_ERR_STS_PORT_OK;
 659}
 660
 661/**
 662 * rio_lock_device - Acquires host device lock for specified device
 663 * @port: Master port to send transaction
 664 * @destid: Destination ID for device/switch
 665 * @hopcount: Hopcount to reach switch
 666 * @wait_ms: Max wait time in msec (0 = no timeout)
 667 *
 668 * Attepts to acquire host device lock for specified device
 669 * Returns 0 if device lock acquired or EINVAL if timeout expires.
 670 */
 671static int
 672rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
 673{
 674        u32 result;
 675        int tcnt = 0;
 676
 677        /* Attempt to acquire device lock */
 678        rio_mport_write_config_32(port, destid, hopcount,
 679                                  RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 680        rio_mport_read_config_32(port, destid, hopcount,
 681                                 RIO_HOST_DID_LOCK_CSR, &result);
 682
 683        while (result != port->host_deviceid) {
 684                if (wait_ms != 0 && tcnt == wait_ms) {
 685                        pr_debug("RIO: timeout when locking device %x:%x\n",
 686                                destid, hopcount);
 687                        return -EINVAL;
 688                }
 689
 690                /* Delay a bit */
 691                mdelay(1);
 692                tcnt++;
 693                /* Try to acquire device lock again */
 694                rio_mport_write_config_32(port, destid,
 695                        hopcount,
 696                        RIO_HOST_DID_LOCK_CSR,
 697                        port->host_deviceid);
 698                rio_mport_read_config_32(port, destid,
 699                        hopcount,
 700                        RIO_HOST_DID_LOCK_CSR, &result);
 701        }
 702
 703        return 0;
 704}
 705
 706/**
 707 * rio_unlock_device - Releases host device lock for specified device
 708 * @port: Master port to send transaction
 709 * @destid: Destination ID for device/switch
 710 * @hopcount: Hopcount to reach switch
 711 *
 712 * Returns 0 if device lock released or EINVAL if fails.
 713 */
 714static int
 715rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
 716{
 717        u32 result;
 718
 719        /* Release device lock */
 720        rio_mport_write_config_32(port, destid,
 721                                  hopcount,
 722                                  RIO_HOST_DID_LOCK_CSR,
 723                                  port->host_deviceid);
 724        rio_mport_read_config_32(port, destid, hopcount,
 725                RIO_HOST_DID_LOCK_CSR, &result);
 726        if ((result & 0xffff) != 0xffff) {
 727                pr_debug("RIO: badness when releasing device lock %x:%x\n",
 728                         destid, hopcount);
 729                return -EINVAL;
 730        }
 731
 732        return 0;
 733}
 734
 735/**
 736 * rio_route_add_entry- Add a route entry to a switch routing table
 737 * @rdev: RIO device
 738 * @table: Routing table ID
 739 * @route_destid: Destination ID to be routed
 740 * @route_port: Port number to be routed
 741 * @lock: lock switch device flag
 742 *
 743 * Calls the switch specific add_entry() method to add a route entry
 744 * on a switch. The route table can be specified using the @table
 745 * argument if a switch has per port routing tables or the normal
 746 * use is to specific all tables (or the global table) by passing
 747 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 748 * on failure.
 749 */
 750static int
 751rio_route_add_entry(struct rio_dev *rdev,
 752                    u16 table, u16 route_destid, u8 route_port, int lock)
 753{
 754        int rc;
 755
 756        if (lock) {
 757                rc = rio_lock_device(rdev->net->hport, rdev->destid,
 758                                     rdev->hopcount, 1000);
 759                if (rc)
 760                        return rc;
 761        }
 762
 763        rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
 764                                      rdev->hopcount, table,
 765                                      route_destid, route_port);
 766        if (lock)
 767                rio_unlock_device(rdev->net->hport, rdev->destid,
 768                                  rdev->hopcount);
 769
 770        return rc;
 771}
 772
 773/**
 774 * rio_route_get_entry- Read a route entry in a switch routing table
 775 * @rdev: RIO device
 776 * @table: Routing table ID
 777 * @route_destid: Destination ID to be routed
 778 * @route_port: Pointer to read port number into
 779 * @lock: lock switch device flag
 780 *
 781 * Calls the switch specific get_entry() method to read a route entry
 782 * in a switch. The route table can be specified using the @table
 783 * argument if a switch has per port routing tables or the normal
 784 * use is to specific all tables (or the global table) by passing
 785 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 786 * on failure.
 787 */
 788static int
 789rio_route_get_entry(struct rio_dev *rdev, u16 table,
 790                    u16 route_destid, u8 *route_port, int lock)
 791{
 792        int rc;
 793
 794        if (lock) {
 795                rc = rio_lock_device(rdev->net->hport, rdev->destid,
 796                                     rdev->hopcount, 1000);
 797                if (rc)
 798                        return rc;
 799        }
 800
 801        rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
 802                                      rdev->hopcount, table,
 803                                      route_destid, route_port);
 804        if (lock)
 805                rio_unlock_device(rdev->net->hport, rdev->destid,
 806                                  rdev->hopcount);
 807
 808        return rc;
 809}
 810
 811/**
 812 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
 813 * @port: Master port to send transaction
 814 * @hopcount: Number of hops to the device
 815 *
 816 * Used during enumeration to read the Host Device ID Lock CSR on a
 817 * RIO device. Returns the value of the lock register.
 818 */
 819static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
 820{
 821        u32 result;
 822
 823        rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
 824                                 RIO_HOST_DID_LOCK_CSR, &result);
 825
 826        return (u16) (result & 0xffff);
 827}
 828
 829/**
 830 * rio_enum_peer- Recursively enumerate a RIO network through a master port
 831 * @net: RIO network being enumerated
 832 * @port: Master port to send transactions
 833 * @hopcount: Number of hops into the network
 834 * @prev: Previous RIO device connected to the enumerated one
 835 * @prev_port: Port on previous RIO device
 836 *
 837 * Recursively enumerates a RIO network.  Transactions are sent via the
 838 * master port passed in @port.
 839 */
 840static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 841                         u8 hopcount, struct rio_dev *prev, int prev_port)
 842{
 843        struct rio_dev *rdev;
 844        u32 regval;
 845        int tmp;
 846
 847        if (rio_mport_chk_dev_access(port,
 848                        RIO_ANY_DESTID(port->sys_size), hopcount)) {
 849                pr_debug("RIO: device access check failed\n");
 850                return -1;
 851        }
 852
 853        if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 854                pr_debug("RIO: PE already discovered by this host\n");
 855                /*
 856                 * Already discovered by this host. Add it as another
 857                 * link to the existing device.
 858                 */
 859                rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
 860                                hopcount, RIO_COMPONENT_TAG_CSR, &regval);
 861
 862                if (regval) {
 863                        rdev = rio_get_comptag((regval & 0xffff), NULL);
 864
 865                        if (rdev && prev && rio_is_switch(prev)) {
 866                                pr_debug("RIO: redundant path to %s\n",
 867                                         rio_name(rdev));
 868                                prev->rswitch->nextdev[prev_port] = rdev;
 869                        }
 870                }
 871
 872                return 0;
 873        }
 874
 875        /* Attempt to acquire device lock */
 876        rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 877                                  hopcount,
 878                                  RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 879        while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
 880               < port->host_deviceid) {
 881                /* Delay a bit */
 882                mdelay(1);
 883                /* Attempt to acquire device lock again */
 884                rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 885                                          hopcount,
 886                                          RIO_HOST_DID_LOCK_CSR,
 887                                          port->host_deviceid);
 888        }
 889
 890        if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
 891                pr_debug(
 892                    "RIO: PE locked by a higher priority host...retreating\n");
 893                return -1;
 894        }
 895
 896        /* Setup new RIO device */
 897        rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
 898                                        hopcount, 1);
 899        if (rdev) {
 900                /* Add device to the global and bus/net specific list. */
 901                list_add_tail(&rdev->net_list, &net->devices);
 902                rdev->prev = prev;
 903                if (prev && rio_is_switch(prev))
 904                        prev->rswitch->nextdev[prev_port] = rdev;
 905        } else
 906                return -1;
 907
 908        if (rio_is_switch(rdev)) {
 909                int sw_destid;
 910                int cur_destid;
 911                int sw_inport;
 912                u16 destid;
 913                int port_num;
 914
 915                sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
 916                rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 917                                    port->host_deviceid, sw_inport, 0);
 918                rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
 919
 920                destid = rio_destid_first(net);
 921                while (destid != RIO_INVALID_DESTID && destid < next_destid) {
 922                        if (destid != port->host_deviceid) {
 923                                rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 924                                                    destid, sw_inport, 0);
 925                                rdev->rswitch->route_table[destid] = sw_inport;
 926                        }
 927                        destid = rio_destid_next(net, destid + 1);
 928                }
 929                pr_debug(
 930                    "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 931                    rio_name(rdev), rdev->vid, rdev->did,
 932                    RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 933                sw_destid = next_destid;
 934                for (port_num = 0;
 935                     port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 936                     port_num++) {
 937                        if (sw_inport == port_num) {
 938                                rio_enable_rx_tx_port(port, 0,
 939                                              RIO_ANY_DESTID(port->sys_size),
 940                                              hopcount, port_num);
 941                                rdev->rswitch->port_ok |= (1 << port_num);
 942                                continue;
 943                        }
 944
 945                        cur_destid = next_destid;
 946
 947                        if (rio_sport_is_active
 948                            (port, RIO_ANY_DESTID(port->sys_size), hopcount,
 949                             port_num)) {
 950                                pr_debug(
 951                                    "RIO: scanning device on port %d\n",
 952                                    port_num);
 953                                rio_enable_rx_tx_port(port, 0,
 954                                              RIO_ANY_DESTID(port->sys_size),
 955                                              hopcount, port_num);
 956                                rdev->rswitch->port_ok |= (1 << port_num);
 957                                rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 958                                                RIO_ANY_DESTID(port->sys_size),
 959                                                port_num, 0);
 960
 961                                if (rio_enum_peer(net, port, hopcount + 1,
 962                                                  rdev, port_num) < 0)
 963                                        return -1;
 964
 965                                /* Update routing tables */
 966                                destid = rio_destid_next(net, cur_destid + 1);
 967                                if (destid != RIO_INVALID_DESTID) {
 968                                        for (destid = cur_destid;
 969                                             destid < next_destid;) {
 970                                                if (destid != port->host_deviceid) {
 971                                                        rio_route_add_entry(rdev,
 972                                                                    RIO_GLOBAL_TABLE,
 973                                                                    destid,
 974                                                                    port_num,
 975                                                                    0);
 976                                                        rdev->rswitch->
 977                                                                route_table[destid] =
 978                                                                port_num;
 979                                                }
 980                                                destid = rio_destid_next(net,
 981                                                                destid + 1);
 982                                        }
 983                                }
 984                        } else {
 985                                /* If switch supports Error Management,
 986                                 * set PORT_LOCKOUT bit for unused port
 987                                 */
 988                                if (rdev->em_efptr)
 989                                        rio_set_port_lockout(rdev, port_num, 1);
 990
 991                                rdev->rswitch->port_ok &= ~(1 << port_num);
 992                        }
 993                }
 994
 995                /* Direct Port-write messages to the enumeratiing host */
 996                if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
 997                    (rdev->em_efptr)) {
 998                        rio_write_config_32(rdev,
 999                                        rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
1000                                        (port->host_deviceid << 16) |
1001                                        (port->sys_size << 15));
1002                }
1003
1004                rio_init_em(rdev);
1005
1006                /* Check for empty switch */
1007                if (next_destid == sw_destid)
1008                        next_destid = rio_destid_alloc(net);
1009
1010                rdev->destid = sw_destid;
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_enum_complete- Tests if enumeration of a network is complete
1020 * @port: Master port to send transaction
1021 *
1022 * Tests the PGCCSR discovered bit for non-zero value (enumeration
1023 * complete flag). Return %1 if enumeration is complete or %0 if
1024 * enumeration is incomplete.
1025 */
1026static int rio_enum_complete(struct rio_mport *port)
1027{
1028        u32 regval;
1029
1030        rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
1031                                 &regval);
1032        return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
1033}
1034
1035/**
1036 * rio_disc_peer- Recursively discovers a RIO network through a master port
1037 * @net: RIO network being discovered
1038 * @port: Master port to send transactions
1039 * @destid: Current destination ID in network
1040 * @hopcount: Number of hops into the network
1041 * @prev: previous rio_dev
1042 * @prev_port: previous port number
1043 *
1044 * Recursively discovers a RIO network.  Transactions are sent via the
1045 * master port passed in @port.
1046 */
1047static int __devinit
1048rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
1049              u8 hopcount, struct rio_dev *prev, int prev_port)
1050{
1051        u8 port_num, route_port;
1052        struct rio_dev *rdev;
1053        u16 ndestid;
1054
1055        /* Setup new RIO device */
1056        if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
1057                /* Add device to the global and bus/net specific list. */
1058                list_add_tail(&rdev->net_list, &net->devices);
1059                rdev->prev = prev;
1060                if (prev && rio_is_switch(prev))
1061                        prev->rswitch->nextdev[prev_port] = rdev;
1062        } else
1063                return -1;
1064
1065        if (rio_is_switch(rdev)) {
1066                /* Associated destid is how we accessed this switch */
1067                rdev->destid = destid;
1068
1069                pr_debug(
1070                    "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
1071                    rio_name(rdev), rdev->vid, rdev->did,
1072                    RIO_GET_TOTAL_PORTS(rdev->swpinfo));
1073                for (port_num = 0;
1074                     port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
1075                     port_num++) {
1076                        if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
1077                                continue;
1078
1079                        if (rio_sport_is_active
1080                            (port, destid, hopcount, port_num)) {
1081                                pr_debug(
1082                                    "RIO: scanning device on port %d\n",
1083                                    port_num);
1084
1085                                rio_lock_device(port, destid, hopcount, 1000);
1086
1087                                for (ndestid = 0;
1088                                     ndestid < RIO_ANY_DESTID(port->sys_size);
1089                                     ndestid++) {
1090                                        rio_route_get_entry(rdev,
1091                                                            RIO_GLOBAL_TABLE,
1092                                                            ndestid,
1093                                                            &route_port, 0);
1094                                        if (route_port == port_num)
1095                                                break;
1096                                }
1097
1098                                if (ndestid == RIO_ANY_DESTID(port->sys_size))
1099                                        continue;
1100                                rio_unlock_device(port, destid, hopcount);
1101                                if (rio_disc_peer(net, port, ndestid,
1102                                        hopcount + 1, rdev, port_num) < 0)
1103                                        return -1;
1104                        }
1105                }
1106        } else
1107                pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1108                    rio_name(rdev), rdev->vid, rdev->did);
1109
1110        return 0;
1111}
1112
1113/**
1114 * rio_mport_is_active- Tests if master port link is active
1115 * @port: Master port to test
1116 *
1117 * Reads the port error status CSR for the master port to
1118 * determine if the port has an active link.  Returns
1119 * %RIO_PORT_N_ERR_STS_PORT_OK if the  master port is active
1120 * or %0 if it is inactive.
1121 */
1122static int rio_mport_is_active(struct rio_mport *port)
1123{
1124        u32 result = 0;
1125        u32 ext_ftr_ptr;
1126        int *entry = rio_mport_phys_table;
1127
1128        do {
1129                if ((ext_ftr_ptr =
1130                     rio_mport_get_feature(port, 1, 0, 0, *entry)))
1131                        break;
1132        } while (*++entry >= 0);
1133
1134        if (ext_ftr_ptr)
1135                rio_local_read_config_32(port,
1136                                         ext_ftr_ptr +
1137                                         RIO_PORT_N_ERR_STS_CSR(port->index),
1138                                         &result);
1139
1140        return result & RIO_PORT_N_ERR_STS_PORT_OK;
1141}
1142
1143/**
1144 * rio_alloc_net- Allocate and configure a new RIO network
1145 * @port: Master port associated with the RIO network
1146 * @do_enum: Enumeration/Discovery mode flag
1147 * @start: logical minimal start id for new net
1148 *
1149 * Allocates a RIO network structure, initializes per-network
1150 * list heads, and adds the associated master port to the
1151 * network list of associated master ports. Returns a
1152 * RIO network pointer on success or %NULL on failure.
1153 */
1154static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port,
1155                                               int do_enum, u16 start)
1156{
1157        struct rio_net *net;
1158
1159        net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1160        if (net && do_enum) {
1161                net->destid_table.table = kcalloc(
1162                        BITS_TO_LONGS(RIO_MAX_ROUTE_ENTRIES(port->sys_size)),
1163                        sizeof(long),
1164                        GFP_KERNEL);
1165
1166                if (net->destid_table.table == NULL) {
1167                        pr_err("RIO: failed to allocate destID table\n");
1168                        kfree(net);
1169                        net = NULL;
1170                } else {
1171                        net->destid_table.start = start;
1172                        net->destid_table.max =
1173                                        RIO_MAX_ROUTE_ENTRIES(port->sys_size);
1174                        spin_lock_init(&net->destid_table.lock);
1175                }
1176        }
1177
1178        if (net) {
1179                INIT_LIST_HEAD(&net->node);
1180                INIT_LIST_HEAD(&net->devices);
1181                INIT_LIST_HEAD(&net->switches);
1182                INIT_LIST_HEAD(&net->mports);
1183                list_add_tail(&port->nnode, &net->mports);
1184                net->hport = port;
1185                net->id = port->id;
1186        }
1187        return net;
1188}
1189
1190/**
1191 * rio_update_route_tables- Updates route tables in switches
1192 * @net: RIO network to run update on
1193 *
1194 * For each enumerated device, ensure that each switch in a system
1195 * has correct routing entries. Add routes for devices that where
1196 * unknown dirung the first enumeration pass through the switch.
1197 */
1198static void rio_update_route_tables(struct rio_net *net)
1199{
1200        struct rio_dev *rdev, *swrdev;
1201        struct rio_switch *rswitch;
1202        u8 sport;
1203        u16 destid;
1204
1205        list_for_each_entry(rdev, &net->devices, net_list) {
1206
1207                destid = rdev->destid;
1208
1209                list_for_each_entry(rswitch, &net->switches, node) {
1210
1211                        if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1212                                continue;
1213
1214                        if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1215                                swrdev = sw_to_rio_dev(rswitch);
1216
1217                                /* Skip if destid ends in empty switch*/
1218                                if (swrdev->destid == destid)
1219                                        continue;
1220
1221                                sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1222
1223                                if (rswitch->add_entry) {
1224                                        rio_route_add_entry(swrdev,
1225                                                RIO_GLOBAL_TABLE, destid,
1226                                                sport, 0);
1227                                        rswitch->route_table[destid] = sport;
1228                                }
1229                        }
1230                }
1231        }
1232}
1233
1234/**
1235 * rio_init_em - Initializes RIO Error Management (for switches)
1236 * @rdev: RIO device
1237 *
1238 * For each enumerated switch, call device-specific error management
1239 * initialization routine (if supplied by the switch driver).
1240 */
1241static void rio_init_em(struct rio_dev *rdev)
1242{
1243        if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1244            (rdev->rswitch->em_init)) {
1245                rdev->rswitch->em_init(rdev);
1246        }
1247}
1248
1249/**
1250 * rio_pw_enable - Enables/disables port-write handling by a master port
1251 * @port: Master port associated with port-write handling
1252 * @enable:  1=enable,  0=disable
1253 */
1254static void rio_pw_enable(struct rio_mport *port, int enable)
1255{
1256        if (port->ops->pwenable)
1257                port->ops->pwenable(port, enable);
1258}
1259
1260/**
1261 * rio_enum_mport- Start enumeration through a master port
1262 * @mport: Master port to send transactions
1263 *
1264 * Starts the enumeration process. If somebody has enumerated our
1265 * master port device, then give up. If not and we have an active
1266 * link, then start recursive peer enumeration. Returns %0 if
1267 * enumeration succeeds or %-EBUSY if enumeration fails.
1268 */
1269int __devinit rio_enum_mport(struct rio_mport *mport)
1270{
1271        struct rio_net *net = NULL;
1272        int rc = 0;
1273
1274        printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1275               mport->name);
1276        /* If somebody else enumerated our master port device, bail. */
1277        if (rio_enum_host(mport) < 0) {
1278                printk(KERN_INFO
1279                       "RIO: master port %d device has been enumerated by a remote host\n",
1280                       mport->id);
1281                rc = -EBUSY;
1282                goto out;
1283        }
1284
1285        /* If master port has an active link, allocate net and enum peers */
1286        if (rio_mport_is_active(mport)) {
1287                net = rio_alloc_net(mport, 1, 0);
1288                if (!net) {
1289                        printk(KERN_ERR "RIO: failed to allocate new net\n");
1290                        rc = -ENOMEM;
1291                        goto out;
1292                }
1293
1294                /* reserve mport destID in new net */
1295                rio_destid_reserve(net, mport->host_deviceid);
1296
1297                /* Enable Input Output Port (transmitter reviever) */
1298                rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1299
1300                /* Set component tag for host */
1301                rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1302                                          next_comptag++);
1303
1304                next_destid = rio_destid_alloc(net);
1305
1306                if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1307                        /* A higher priority host won enumeration, bail. */
1308                        printk(KERN_INFO
1309                               "RIO: master port %d device has lost enumeration to a remote host\n",
1310                               mport->id);
1311                        rio_clear_locks(net);
1312                        rc = -EBUSY;
1313                        goto out;
1314                }
1315                /* free the last allocated destID (unused) */
1316                rio_destid_free(net, next_destid);
1317                rio_update_route_tables(net);
1318                rio_clear_locks(net);
1319                rio_pw_enable(mport, 1);
1320        } else {
1321                printk(KERN_INFO "RIO: master port %d link inactive\n",
1322                       mport->id);
1323                rc = -EINVAL;
1324        }
1325
1326      out:
1327        return rc;
1328}
1329
1330/**
1331 * rio_build_route_tables- Generate route tables from switch route entries
1332 * @net: RIO network to run route tables scan on
1333 *
1334 * For each switch device, generate a route table by copying existing
1335 * route entries from the switch.
1336 */
1337static void rio_build_route_tables(struct rio_net *net)
1338{
1339        struct rio_switch *rswitch;
1340        struct rio_dev *rdev;
1341        int i;
1342        u8 sport;
1343
1344        list_for_each_entry(rswitch, &net->switches, node) {
1345                rdev = sw_to_rio_dev(rswitch);
1346
1347                rio_lock_device(net->hport, rdev->destid,
1348                                rdev->hopcount, 1000);
1349                for (i = 0;
1350                     i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1351                     i++) {
1352                        if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1353                                                i, &sport, 0) < 0)
1354                                continue;
1355                        rswitch->route_table[i] = sport;
1356                }
1357
1358                rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1359        }
1360}
1361
1362/**
1363 * rio_disc_mport- Start discovery through a master port
1364 * @mport: Master port to send transactions
1365 *
1366 * Starts the discovery process. If we have an active link,
1367 * then wait for the signal that enumeration is complete.
1368 * When enumeration completion is signaled, start recursive
1369 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1370 * on failure.
1371 */
1372int __devinit rio_disc_mport(struct rio_mport *mport)
1373{
1374        struct rio_net *net = NULL;
1375        unsigned long to_end;
1376
1377        printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1378               mport->name);
1379
1380        /* If master port has an active link, allocate net and discover peers */
1381        if (rio_mport_is_active(mport)) {
1382                pr_debug("RIO: wait for enumeration to complete...\n");
1383
1384                to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1385                while (time_before(jiffies, to_end)) {
1386                        if (rio_enum_complete(mport))
1387                                goto enum_done;
1388                        msleep(10);
1389                }
1390
1391                pr_debug("RIO: discovery timeout on mport %d %s\n",
1392                         mport->id, mport->name);
1393                goto bail;
1394enum_done:
1395                pr_debug("RIO: ... enumeration done\n");
1396
1397                net = rio_alloc_net(mport, 0, 0);
1398                if (!net) {
1399                        printk(KERN_ERR "RIO: Failed to allocate new net\n");
1400                        goto bail;
1401                }
1402
1403                /* Read DestID assigned by enumerator */
1404                rio_local_read_config_32(mport, RIO_DID_CSR,
1405                                         &mport->host_deviceid);
1406                mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1407                                                   mport->host_deviceid);
1408
1409                if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1410                                        0, NULL, 0) < 0) {
1411                        printk(KERN_INFO
1412                               "RIO: master port %d device has failed discovery\n",
1413                               mport->id);
1414                        goto bail;
1415                }
1416
1417                rio_build_route_tables(net);
1418        }
1419
1420        return 0;
1421bail:
1422        return -EBUSY;
1423}
1424
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