linux/drivers/rapidio/rio-scan.c
<<
>>
Prefs
   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
  40static void rio_init_em(struct rio_dev *rdev);
  41
  42static int next_destid = 0;
  43static int next_comptag = 1;
  44
  45static int rio_mport_phys_table[] = {
  46        RIO_EFB_PAR_EP_ID,
  47        RIO_EFB_PAR_EP_REC_ID,
  48        RIO_EFB_SER_EP_ID,
  49        RIO_EFB_SER_EP_REC_ID,
  50        -1,
  51};
  52
  53
  54/**
  55 * rio_destid_alloc - Allocate next available destID for given network
  56 * @net: RIO network
  57 *
  58 * Returns next available device destination ID for the specified RIO network.
  59 * Marks allocated ID as one in use.
  60 * Returns RIO_INVALID_DESTID if new destID is not available.
  61 */
  62static u16 rio_destid_alloc(struct rio_net *net)
  63{
  64        int destid;
  65        struct rio_id_table *idtab = &net->destid_table;
  66
  67        spin_lock(&idtab->lock);
  68        destid = find_first_zero_bit(idtab->table, idtab->max);
  69
  70        if (destid < idtab->max) {
  71                set_bit(destid, idtab->table);
  72                destid += idtab->start;
  73        } else
  74                destid = RIO_INVALID_DESTID;
  75
  76        spin_unlock(&idtab->lock);
  77        return (u16)destid;
  78}
  79
  80/**
  81 * rio_destid_reserve - Reserve the specivied destID
  82 * @net: RIO network
  83 * @destid: destID to reserve
  84 *
  85 * Tries to reserve the specified destID.
  86 * Returns 0 if successfull.
  87 */
  88static int rio_destid_reserve(struct rio_net *net, u16 destid)
  89{
  90        int oldbit;
  91        struct rio_id_table *idtab = &net->destid_table;
  92
  93        destid -= idtab->start;
  94        spin_lock(&idtab->lock);
  95        oldbit = test_and_set_bit(destid, idtab->table);
  96        spin_unlock(&idtab->lock);
  97        return oldbit;
  98}
  99
 100/**
 101 * rio_destid_free - free a previously allocated destID
 102 * @net: RIO network
 103 * @destid: destID to free
 104 *
 105 * Makes the specified destID available for use.
 106 */
 107static void rio_destid_free(struct rio_net *net, u16 destid)
 108{
 109        struct rio_id_table *idtab = &net->destid_table;
 110
 111        destid -= idtab->start;
 112        spin_lock(&idtab->lock);
 113        clear_bit(destid, idtab->table);
 114        spin_unlock(&idtab->lock);
 115}
 116
 117/**
 118 * rio_destid_first - return first destID in use
 119 * @net: RIO network
 120 */
 121static u16 rio_destid_first(struct rio_net *net)
 122{
 123        int destid;
 124        struct rio_id_table *idtab = &net->destid_table;
 125
 126        spin_lock(&idtab->lock);
 127        destid = find_first_bit(idtab->table, idtab->max);
 128        if (destid >= idtab->max)
 129                destid = RIO_INVALID_DESTID;
 130        else
 131                destid += idtab->start;
 132        spin_unlock(&idtab->lock);
 133        return (u16)destid;
 134}
 135
 136/**
 137 * rio_destid_next - return next destID in use
 138 * @net: RIO network
 139 * @from: destination ID from which search shall continue
 140 */
 141static u16 rio_destid_next(struct rio_net *net, u16 from)
 142{
 143        int destid;
 144        struct rio_id_table *idtab = &net->destid_table;
 145
 146        spin_lock(&idtab->lock);
 147        destid = find_next_bit(idtab->table, idtab->max, from);
 148        if (destid >= idtab->max)
 149                destid = RIO_INVALID_DESTID;
 150        else
 151                destid += idtab->start;
 152        spin_unlock(&idtab->lock);
 153        return (u16)destid;
 154}
 155
 156/**
 157 * rio_get_device_id - Get the base/extended device id for a device
 158 * @port: RIO master port
 159 * @destid: Destination ID of device
 160 * @hopcount: Hopcount to device
 161 *
 162 * Reads the base/extended device id from a device. Returns the
 163 * 8/16-bit device ID.
 164 */
 165static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
 166{
 167        u32 result;
 168
 169        rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
 170
 171        return RIO_GET_DID(port->sys_size, result);
 172}
 173
 174/**
 175 * rio_set_device_id - Set the base/extended device id for a device
 176 * @port: RIO master port
 177 * @destid: Destination ID of device
 178 * @hopcount: Hopcount to device
 179 * @did: Device ID value to be written
 180 *
 181 * Writes the base/extended device id from a device.
 182 */
 183static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
 184{
 185        rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
 186                                  RIO_SET_DID(port->sys_size, did));
 187}
 188
 189/**
 190 * rio_local_set_device_id - Set the base/extended device id for a port
 191 * @port: RIO master port
 192 * @did: Device ID value to be written
 193 *
 194 * Writes the base/extended device id from a device.
 195 */
 196static void rio_local_set_device_id(struct rio_mport *port, u16 did)
 197{
 198        rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
 199                                did));
 200}
 201
 202/**
 203 * rio_clear_locks- Release all host locks and signal enumeration complete
 204 * @net: RIO network to run on
 205 *
 206 * Marks the component tag CSR on each device with the enumeration
 207 * complete flag. When complete, it then release the host locks on
 208 * each device. Returns 0 on success or %-EINVAL on failure.
 209 */
 210static int rio_clear_locks(struct rio_net *net)
 211{
 212        struct rio_mport *port = net->hport;
 213        struct rio_dev *rdev;
 214        u32 result;
 215        int ret = 0;
 216
 217        /* Release host device id locks */
 218        rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 219                                  port->host_deviceid);
 220        rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 221        if ((result & 0xffff) != 0xffff) {
 222                printk(KERN_INFO
 223                       "RIO: badness when releasing host lock on master port, result %8.8x\n",
 224                       result);
 225                ret = -EINVAL;
 226        }
 227        list_for_each_entry(rdev, &net->devices, net_list) {
 228                rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
 229                                    port->host_deviceid);
 230                rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
 231                if ((result & 0xffff) != 0xffff) {
 232                        printk(KERN_INFO
 233                               "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
 234                               rdev->vid, rdev->did);
 235                        ret = -EINVAL;
 236                }
 237
 238                /* Mark device as discovered and enable master */
 239                rio_read_config_32(rdev,
 240                                   rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 241                                   &result);
 242                result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
 243                rio_write_config_32(rdev,
 244                                    rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 245                                    result);
 246        }
 247
 248        return ret;
 249}
 250
 251/**
 252 * rio_enum_host- Set host lock and initialize host destination ID
 253 * @port: Master port to issue transaction
 254 *
 255 * Sets the local host master port lock and destination ID register
 256 * with the host device ID value. The host device ID value is provided
 257 * by the platform. Returns %0 on success or %-1 on failure.
 258 */
 259static int rio_enum_host(struct rio_mport *port)
 260{
 261        u32 result;
 262
 263        /* Set master port host device id lock */
 264        rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 265                                  port->host_deviceid);
 266
 267        rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 268        if ((result & 0xffff) != port->host_deviceid)
 269                return -1;
 270
 271        /* Set master port destid and init destid ctr */
 272        rio_local_set_device_id(port, port->host_deviceid);
 273        return 0;
 274}
 275
 276/**
 277 * rio_device_has_destid- Test if a device contains a destination ID register
 278 * @port: Master port to issue transaction
 279 * @src_ops: RIO device source operations
 280 * @dst_ops: RIO device destination operations
 281 *
 282 * Checks the provided @src_ops and @dst_ops for the necessary transaction
 283 * capabilities that indicate whether or not a device will implement a
 284 * destination ID register. Returns 1 if true or 0 if false.
 285 */
 286static int rio_device_has_destid(struct rio_mport *port, int src_ops,
 287                                 int dst_ops)
 288{
 289        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;
 290
 291        return !!((src_ops | dst_ops) & mask);
 292}
 293
 294/**
 295 * rio_release_dev- Frees a RIO device struct
 296 * @dev: LDM device associated with a RIO device struct
 297 *
 298 * Gets the RIO device struct associated a RIO device struct.
 299 * The RIO device struct is freed.
 300 */
 301static void rio_release_dev(struct device *dev)
 302{
 303        struct rio_dev *rdev;
 304
 305        rdev = to_rio_dev(dev);
 306        kfree(rdev);
 307}
 308
 309/**
 310 * rio_is_switch- Tests if a RIO device has switch capabilities
 311 * @rdev: RIO device
 312 *
 313 * Gets the RIO device Processing Element Features register
 314 * contents and tests for switch capabilities. Returns 1 if
 315 * the device is a switch or 0 if it is not a switch.
 316 * The RIO device struct is freed.
 317 */
 318static int rio_is_switch(struct rio_dev *rdev)
 319{
 320        if (rdev->pef & RIO_PEF_SWITCH)
 321                return 1;
 322        return 0;
 323}
 324
 325/**
 326 * rio_setup_device- Allocates and sets up a RIO device
 327 * @net: RIO network
 328 * @port: Master port to send transactions
 329 * @destid: Current destination ID
 330 * @hopcount: Current hopcount
 331 * @do_enum: Enumeration/Discovery mode flag
 332 *
 333 * Allocates a RIO device and configures fields based on configuration
 334 * space contents. If device has a destination ID register, a destination
 335 * ID is either assigned in enumeration mode or read from configuration
 336 * space in discovery mode.  If the device has switch capabilities, then
 337 * a switch is allocated and configured appropriately. Returns a pointer
 338 * to a RIO device on success or NULL on failure.
 339 *
 340 */
 341static struct rio_dev *rio_setup_device(struct rio_net *net,
 342                                        struct rio_mport *port, u16 destid,
 343                                        u8 hopcount, int do_enum)
 344{
 345        int ret = 0;
 346        struct rio_dev *rdev;
 347        struct rio_switch *rswitch = NULL;
 348        int result, rdid;
 349        size_t size;
 350        u32 swpinfo = 0;
 351
 352        size = sizeof(struct rio_dev);
 353        if (rio_mport_read_config_32(port, destid, hopcount,
 354                                     RIO_PEF_CAR, &result))
 355                return NULL;
 356
 357        if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
 358                rio_mport_read_config_32(port, destid, hopcount,
 359                                         RIO_SWP_INFO_CAR, &swpinfo);
 360                if (result & RIO_PEF_SWITCH) {
 361                        size += (RIO_GET_TOTAL_PORTS(swpinfo) *
 362                                sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
 363                }
 364        }
 365
 366        rdev = kzalloc(size, GFP_KERNEL);
 367        if (!rdev)
 368                return NULL;
 369
 370        rdev->net = net;
 371        rdev->pef = result;
 372        rdev->swpinfo = swpinfo;
 373        rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
 374                                 &result);
 375        rdev->did = result >> 16;
 376        rdev->vid = result & 0xffff;
 377        rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
 378                                 &rdev->device_rev);
 379        rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
 380                                 &result);
 381        rdev->asm_did = result >> 16;
 382        rdev->asm_vid = result & 0xffff;
 383        rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
 384                                 &result);
 385        rdev->asm_rev = result >> 16;
 386        if (rdev->pef & RIO_PEF_EXT_FEATURES) {
 387                rdev->efptr = result & 0xffff;
 388                rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
 389                                                         hopcount);
 390
 391                rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
 392                                                hopcount, RIO_EFB_ERR_MGMNT);
 393        }
 394
 395        rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
 396                                 &rdev->src_ops);
 397        rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
 398                                 &rdev->dst_ops);
 399
 400        if (do_enum) {
 401                /* Assign component tag to device */
 402                if (next_comptag >= 0x10000) {
 403                        pr_err("RIO: Component Tag Counter Overflow\n");
 404                        goto cleanup;
 405                }
 406                rio_mport_write_config_32(port, destid, hopcount,
 407                                          RIO_COMPONENT_TAG_CSR, next_comptag);
 408                rdev->comp_tag = next_comptag++;
 409                rdev->do_enum = true;
 410        }  else {
 411                rio_mport_read_config_32(port, destid, hopcount,
 412                                         RIO_COMPONENT_TAG_CSR,
 413                                         &rdev->comp_tag);
 414        }
 415
 416        if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
 417                if (do_enum) {
 418                        rio_set_device_id(port, destid, hopcount, next_destid);
 419                        rdev->destid = next_destid;
 420                        next_destid = rio_destid_alloc(net);
 421                } else
 422                        rdev->destid = rio_get_device_id(port, destid, hopcount);
 423
 424                rdev->hopcount = 0xff;
 425        } else {
 426                /* Switch device has an associated destID which
 427                 * will be adjusted later
 428                 */
 429                rdev->destid = destid;
 430                rdev->hopcount = hopcount;
 431        }
 432
 433        /* If a PE has both switch and other functions, show it as a switch */
 434        if (rio_is_switch(rdev)) {
 435                rswitch = rdev->rswitch;
 436                rswitch->port_ok = 0;
 437                spin_lock_init(&rswitch->lock);
 438                rswitch->route_table = kzalloc(sizeof(u8)*
 439                                        RIO_MAX_ROUTE_ENTRIES(port->sys_size),
 440                                        GFP_KERNEL);
 441                if (!rswitch->route_table)
 442                        goto cleanup;
 443                /* Initialize switch route table */
 444                for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
 445                                rdid++)
 446                        rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
 447                dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
 448                             rdev->comp_tag & RIO_CTAG_UDEVID);
 449
 450                if (do_enum)
 451                        rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
 452
 453                list_add_tail(&rswitch->node, &net->switches);
 454
 455        } else {
 456                if (do_enum)
 457                        /*Enable Input Output Port (transmitter reviever)*/
 458                        rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
 459
 460                dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
 461                             rdev->comp_tag & RIO_CTAG_UDEVID);
 462        }
 463
 464        rio_attach_device(rdev);
 465
 466        device_initialize(&rdev->dev);
 467        rdev->dev.release = rio_release_dev;
 468        rio_dev_get(rdev);
 469
 470        rdev->dma_mask = DMA_BIT_MASK(32);
 471        rdev->dev.dma_mask = &rdev->dma_mask;
 472        rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 473
 474        if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
 475                rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 476                                   0, 0xffff);
 477
 478        ret = rio_add_device(rdev);
 479        if (ret)
 480                goto cleanup;
 481
 482        return rdev;
 483
 484cleanup:
 485        if (rswitch)
 486                kfree(rswitch->route_table);
 487
 488        kfree(rdev);
 489        return NULL;
 490}
 491
 492/**
 493 * rio_sport_is_active- Tests if a switch port has an active connection.
 494 * @port: Master port to send transaction
 495 * @destid: Associated destination ID for switch
 496 * @hopcount: Hopcount to reach switch
 497 * @sport: Switch port number
 498 *
 499 * Reads the port error status CSR for a particular switch port to
 500 * determine if the port has an active link.  Returns
 501 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
 502 * inactive.
 503 */
 504static int
 505rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
 506{
 507        u32 result = 0;
 508        u32 ext_ftr_ptr;
 509
 510        ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
 511
 512        while (ext_ftr_ptr) {
 513                rio_mport_read_config_32(port, destid, hopcount,
 514                                         ext_ftr_ptr, &result);
 515                result = RIO_GET_BLOCK_ID(result);
 516                if ((result == RIO_EFB_SER_EP_FREE_ID) ||
 517                    (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
 518                    (result == RIO_EFB_SER_EP_FREC_ID))
 519                        break;
 520
 521                ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
 522                                                ext_ftr_ptr);
 523        }
 524
 525        if (ext_ftr_ptr)
 526                rio_mport_read_config_32(port, destid, hopcount,
 527                                         ext_ftr_ptr +
 528                                         RIO_PORT_N_ERR_STS_CSR(sport),
 529                                         &result);
 530
 531        return result & RIO_PORT_N_ERR_STS_PORT_OK;
 532}
 533
 534/**
 535 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
 536 * @port: Master port to send transaction
 537 * @hopcount: Number of hops to the device
 538 *
 539 * Used during enumeration to read the Host Device ID Lock CSR on a
 540 * RIO device. Returns the value of the lock register.
 541 */
 542static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
 543{
 544        u32 result;
 545
 546        rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
 547                                 RIO_HOST_DID_LOCK_CSR, &result);
 548
 549        return (u16) (result & 0xffff);
 550}
 551
 552/**
 553 * rio_enum_peer- Recursively enumerate a RIO network through a master port
 554 * @net: RIO network being enumerated
 555 * @port: Master port to send transactions
 556 * @hopcount: Number of hops into the network
 557 * @prev: Previous RIO device connected to the enumerated one
 558 * @prev_port: Port on previous RIO device
 559 *
 560 * Recursively enumerates a RIO network.  Transactions are sent via the
 561 * master port passed in @port.
 562 */
 563static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 564                         u8 hopcount, struct rio_dev *prev, int prev_port)
 565{
 566        struct rio_dev *rdev;
 567        u32 regval;
 568        int tmp;
 569
 570        if (rio_mport_chk_dev_access(port,
 571                        RIO_ANY_DESTID(port->sys_size), hopcount)) {
 572                pr_debug("RIO: device access check failed\n");
 573                return -1;
 574        }
 575
 576        if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 577                pr_debug("RIO: PE already discovered by this host\n");
 578                /*
 579                 * Already discovered by this host. Add it as another
 580                 * link to the existing device.
 581                 */
 582                rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
 583                                hopcount, RIO_COMPONENT_TAG_CSR, &regval);
 584
 585                if (regval) {
 586                        rdev = rio_get_comptag((regval & 0xffff), NULL);
 587
 588                        if (rdev && prev && rio_is_switch(prev)) {
 589                                pr_debug("RIO: redundant path to %s\n",
 590                                         rio_name(rdev));
 591                                prev->rswitch->nextdev[prev_port] = rdev;
 592                        }
 593                }
 594
 595                return 0;
 596        }
 597
 598        /* Attempt to acquire device lock */
 599        rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 600                                  hopcount,
 601                                  RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 602        while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
 603               < port->host_deviceid) {
 604                /* Delay a bit */
 605                mdelay(1);
 606                /* Attempt to acquire device lock again */
 607                rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 608                                          hopcount,
 609                                          RIO_HOST_DID_LOCK_CSR,
 610                                          port->host_deviceid);
 611        }
 612
 613        if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
 614                pr_debug(
 615                    "RIO: PE locked by a higher priority host...retreating\n");
 616                return -1;
 617        }
 618
 619        /* Setup new RIO device */
 620        rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
 621                                        hopcount, 1);
 622        if (rdev) {
 623                /* Add device to the global and bus/net specific list. */
 624                list_add_tail(&rdev->net_list, &net->devices);
 625                rdev->prev = prev;
 626                if (prev && rio_is_switch(prev))
 627                        prev->rswitch->nextdev[prev_port] = rdev;
 628        } else
 629                return -1;
 630
 631        if (rio_is_switch(rdev)) {
 632                int sw_destid;
 633                int cur_destid;
 634                int sw_inport;
 635                u16 destid;
 636                int port_num;
 637
 638                sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
 639                rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 640                                    port->host_deviceid, sw_inport, 0);
 641                rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
 642
 643                destid = rio_destid_first(net);
 644                while (destid != RIO_INVALID_DESTID && destid < next_destid) {
 645                        if (destid != port->host_deviceid) {
 646                                rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 647                                                    destid, sw_inport, 0);
 648                                rdev->rswitch->route_table[destid] = sw_inport;
 649                        }
 650                        destid = rio_destid_next(net, destid + 1);
 651                }
 652                pr_debug(
 653                    "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 654                    rio_name(rdev), rdev->vid, rdev->did,
 655                    RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 656                sw_destid = next_destid;
 657                for (port_num = 0;
 658                     port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 659                     port_num++) {
 660                        if (sw_inport == port_num) {
 661                                rio_enable_rx_tx_port(port, 0,
 662                                              RIO_ANY_DESTID(port->sys_size),
 663                                              hopcount, port_num);
 664                                rdev->rswitch->port_ok |= (1 << port_num);
 665                                continue;
 666                        }
 667
 668                        cur_destid = next_destid;
 669
 670                        if (rio_sport_is_active
 671                            (port, RIO_ANY_DESTID(port->sys_size), hopcount,
 672                             port_num)) {
 673                                pr_debug(
 674                                    "RIO: scanning device on port %d\n",
 675                                    port_num);
 676                                rio_enable_rx_tx_port(port, 0,
 677                                              RIO_ANY_DESTID(port->sys_size),
 678                                              hopcount, port_num);
 679                                rdev->rswitch->port_ok |= (1 << port_num);
 680                                rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 681                                                RIO_ANY_DESTID(port->sys_size),
 682                                                port_num, 0);
 683
 684                                if (rio_enum_peer(net, port, hopcount + 1,
 685                                                  rdev, port_num) < 0)
 686                                        return -1;
 687
 688                                /* Update routing tables */
 689                                destid = rio_destid_next(net, cur_destid + 1);
 690                                if (destid != RIO_INVALID_DESTID) {
 691                                        for (destid = cur_destid;
 692                                             destid < next_destid;) {
 693                                                if (destid != port->host_deviceid) {
 694                                                        rio_route_add_entry(rdev,
 695                                                                    RIO_GLOBAL_TABLE,
 696                                                                    destid,
 697                                                                    port_num,
 698                                                                    0);
 699                                                        rdev->rswitch->
 700                                                                route_table[destid] =
 701                                                                port_num;
 702                                                }
 703                                                destid = rio_destid_next(net,
 704                                                                destid + 1);
 705                                        }
 706                                }
 707                        } else {
 708                                /* If switch supports Error Management,
 709                                 * set PORT_LOCKOUT bit for unused port
 710                                 */
 711                                if (rdev->em_efptr)
 712                                        rio_set_port_lockout(rdev, port_num, 1);
 713
 714                                rdev->rswitch->port_ok &= ~(1 << port_num);
 715                        }
 716                }
 717
 718                /* Direct Port-write messages to the enumeratiing host */
 719                if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
 720                    (rdev->em_efptr)) {
 721                        rio_write_config_32(rdev,
 722                                        rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
 723                                        (port->host_deviceid << 16) |
 724                                        (port->sys_size << 15));
 725                }
 726
 727                rio_init_em(rdev);
 728
 729                /* Check for empty switch */
 730                if (next_destid == sw_destid)
 731                        next_destid = rio_destid_alloc(net);
 732
 733                rdev->destid = sw_destid;
 734        } else
 735                pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 736                    rio_name(rdev), rdev->vid, rdev->did);
 737
 738        return 0;
 739}
 740
 741/**
 742 * rio_enum_complete- Tests if enumeration of a network is complete
 743 * @port: Master port to send transaction
 744 *
 745 * Tests the PGCCSR discovered bit for non-zero value (enumeration
 746 * complete flag). Return %1 if enumeration is complete or %0 if
 747 * enumeration is incomplete.
 748 */
 749static int rio_enum_complete(struct rio_mport *port)
 750{
 751        u32 regval;
 752
 753        rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 754                                 &regval);
 755        return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
 756}
 757
 758/**
 759 * rio_disc_peer- Recursively discovers a RIO network through a master port
 760 * @net: RIO network being discovered
 761 * @port: Master port to send transactions
 762 * @destid: Current destination ID in network
 763 * @hopcount: Number of hops into the network
 764 * @prev: previous rio_dev
 765 * @prev_port: previous port number
 766 *
 767 * Recursively discovers a RIO network.  Transactions are sent via the
 768 * master port passed in @port.
 769 */
 770static int
 771rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
 772              u8 hopcount, struct rio_dev *prev, int prev_port)
 773{
 774        u8 port_num, route_port;
 775        struct rio_dev *rdev;
 776        u16 ndestid;
 777
 778        /* Setup new RIO device */
 779        if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
 780                /* Add device to the global and bus/net specific list. */
 781                list_add_tail(&rdev->net_list, &net->devices);
 782                rdev->prev = prev;
 783                if (prev && rio_is_switch(prev))
 784                        prev->rswitch->nextdev[prev_port] = rdev;
 785        } else
 786                return -1;
 787
 788        if (rio_is_switch(rdev)) {
 789                /* Associated destid is how we accessed this switch */
 790                rdev->destid = destid;
 791
 792                pr_debug(
 793                    "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 794                    rio_name(rdev), rdev->vid, rdev->did,
 795                    RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 796                for (port_num = 0;
 797                     port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 798                     port_num++) {
 799                        if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
 800                                continue;
 801
 802                        if (rio_sport_is_active
 803                            (port, destid, hopcount, port_num)) {
 804                                pr_debug(
 805                                    "RIO: scanning device on port %d\n",
 806                                    port_num);
 807
 808                                rio_lock_device(port, destid, hopcount, 1000);
 809
 810                                for (ndestid = 0;
 811                                     ndestid < RIO_ANY_DESTID(port->sys_size);
 812                                     ndestid++) {
 813                                        rio_route_get_entry(rdev,
 814                                                            RIO_GLOBAL_TABLE,
 815                                                            ndestid,
 816                                                            &route_port, 0);
 817                                        if (route_port == port_num)
 818                                                break;
 819                                }
 820
 821                                if (ndestid == RIO_ANY_DESTID(port->sys_size))
 822                                        continue;
 823                                rio_unlock_device(port, destid, hopcount);
 824                                if (rio_disc_peer(net, port, ndestid,
 825                                        hopcount + 1, rdev, port_num) < 0)
 826                                        return -1;
 827                        }
 828                }
 829        } else
 830                pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 831                    rio_name(rdev), rdev->vid, rdev->did);
 832
 833        return 0;
 834}
 835
 836/**
 837 * rio_mport_is_active- Tests if master port link is active
 838 * @port: Master port to test
 839 *
 840 * Reads the port error status CSR for the master port to
 841 * determine if the port has an active link.  Returns
 842 * %RIO_PORT_N_ERR_STS_PORT_OK if the  master port is active
 843 * or %0 if it is inactive.
 844 */
 845static int rio_mport_is_active(struct rio_mport *port)
 846{
 847        u32 result = 0;
 848        u32 ext_ftr_ptr;
 849        int *entry = rio_mport_phys_table;
 850
 851        do {
 852                if ((ext_ftr_ptr =
 853                     rio_mport_get_feature(port, 1, 0, 0, *entry)))
 854                        break;
 855        } while (*++entry >= 0);
 856
 857        if (ext_ftr_ptr)
 858                rio_local_read_config_32(port,
 859                                         ext_ftr_ptr +
 860                                         RIO_PORT_N_ERR_STS_CSR(port->index),
 861                                         &result);
 862
 863        return result & RIO_PORT_N_ERR_STS_PORT_OK;
 864}
 865
 866/**
 867 * rio_alloc_net- Allocate and configure a new RIO network
 868 * @port: Master port associated with the RIO network
 869 * @do_enum: Enumeration/Discovery mode flag
 870 * @start: logical minimal start id for new net
 871 *
 872 * Allocates a RIO network structure, initializes per-network
 873 * list heads, and adds the associated master port to the
 874 * network list of associated master ports. Returns a
 875 * RIO network pointer on success or %NULL on failure.
 876 */
 877static struct rio_net *rio_alloc_net(struct rio_mport *port,
 878                                               int do_enum, u16 start)
 879{
 880        struct rio_net *net;
 881
 882        net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
 883        if (net && do_enum) {
 884                net->destid_table.table = kcalloc(
 885                        BITS_TO_LONGS(RIO_MAX_ROUTE_ENTRIES(port->sys_size)),
 886                        sizeof(long),
 887                        GFP_KERNEL);
 888
 889                if (net->destid_table.table == NULL) {
 890                        pr_err("RIO: failed to allocate destID table\n");
 891                        kfree(net);
 892                        net = NULL;
 893                } else {
 894                        net->destid_table.start = start;
 895                        net->destid_table.max =
 896                                        RIO_MAX_ROUTE_ENTRIES(port->sys_size);
 897                        spin_lock_init(&net->destid_table.lock);
 898                }
 899        }
 900
 901        if (net) {
 902                INIT_LIST_HEAD(&net->node);
 903                INIT_LIST_HEAD(&net->devices);
 904                INIT_LIST_HEAD(&net->switches);
 905                INIT_LIST_HEAD(&net->mports);
 906                list_add_tail(&port->nnode, &net->mports);
 907                net->hport = port;
 908                net->id = port->id;
 909        }
 910        return net;
 911}
 912
 913/**
 914 * rio_update_route_tables- Updates route tables in switches
 915 * @net: RIO network to run update on
 916 *
 917 * For each enumerated device, ensure that each switch in a system
 918 * has correct routing entries. Add routes for devices that where
 919 * unknown dirung the first enumeration pass through the switch.
 920 */
 921static void rio_update_route_tables(struct rio_net *net)
 922{
 923        struct rio_dev *rdev, *swrdev;
 924        struct rio_switch *rswitch;
 925        u8 sport;
 926        u16 destid;
 927
 928        list_for_each_entry(rdev, &net->devices, net_list) {
 929
 930                destid = rdev->destid;
 931
 932                list_for_each_entry(rswitch, &net->switches, node) {
 933
 934                        if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
 935                                continue;
 936
 937                        if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
 938                                swrdev = sw_to_rio_dev(rswitch);
 939
 940                                /* Skip if destid ends in empty switch*/
 941                                if (swrdev->destid == destid)
 942                                        continue;
 943
 944                                sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
 945
 946                                rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
 947                                                    destid, sport, 0);
 948                                rswitch->route_table[destid] = sport;
 949                        }
 950                }
 951        }
 952}
 953
 954/**
 955 * rio_init_em - Initializes RIO Error Management (for switches)
 956 * @rdev: RIO device
 957 *
 958 * For each enumerated switch, call device-specific error management
 959 * initialization routine (if supplied by the switch driver).
 960 */
 961static void rio_init_em(struct rio_dev *rdev)
 962{
 963        if (rio_is_switch(rdev) && (rdev->em_efptr) &&
 964            rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
 965                rdev->rswitch->ops->em_init(rdev);
 966        }
 967}
 968
 969/**
 970 * rio_pw_enable - Enables/disables port-write handling by a master port
 971 * @port: Master port associated with port-write handling
 972 * @enable:  1=enable,  0=disable
 973 */
 974static void rio_pw_enable(struct rio_mport *port, int enable)
 975{
 976        if (port->ops->pwenable)
 977                port->ops->pwenable(port, enable);
 978}
 979
 980/**
 981 * rio_enum_mport- Start enumeration through a master port
 982 * @mport: Master port to send transactions
 983 * @flags: Enumeration control flags
 984 *
 985 * Starts the enumeration process. If somebody has enumerated our
 986 * master port device, then give up. If not and we have an active
 987 * link, then start recursive peer enumeration. Returns %0 if
 988 * enumeration succeeds or %-EBUSY if enumeration fails.
 989 */
 990static int rio_enum_mport(struct rio_mport *mport, u32 flags)
 991{
 992        struct rio_net *net = NULL;
 993        int rc = 0;
 994
 995        printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
 996               mport->name);
 997
 998        /*
 999         * To avoid multiple start requests (repeat enumeration is not supported
1000         * by this method) check if enumeration/discovery was performed for this
1001         * mport: if mport was added into the list of mports for a net exit
1002         * with error.
1003         */
1004        if (mport->nnode.next || mport->nnode.prev)
1005                return -EBUSY;
1006
1007        /* If somebody else enumerated our master port device, bail. */
1008        if (rio_enum_host(mport) < 0) {
1009                printk(KERN_INFO
1010                       "RIO: master port %d device has been enumerated by a remote host\n",
1011                       mport->id);
1012                rc = -EBUSY;
1013                goto out;
1014        }
1015
1016        /* If master port has an active link, allocate net and enum peers */
1017        if (rio_mport_is_active(mport)) {
1018                net = rio_alloc_net(mport, 1, 0);
1019                if (!net) {
1020                        printk(KERN_ERR "RIO: failed to allocate new net\n");
1021                        rc = -ENOMEM;
1022                        goto out;
1023                }
1024
1025                /* reserve mport destID in new net */
1026                rio_destid_reserve(net, mport->host_deviceid);
1027
1028                /* Enable Input Output Port (transmitter reviever) */
1029                rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1030
1031                /* Set component tag for host */
1032                rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1033                                          next_comptag++);
1034
1035                next_destid = rio_destid_alloc(net);
1036
1037                if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1038                        /* A higher priority host won enumeration, bail. */
1039                        printk(KERN_INFO
1040                               "RIO: master port %d device has lost enumeration to a remote host\n",
1041                               mport->id);
1042                        rio_clear_locks(net);
1043                        rc = -EBUSY;
1044                        goto out;
1045                }
1046                /* free the last allocated destID (unused) */
1047                rio_destid_free(net, next_destid);
1048                rio_update_route_tables(net);
1049                rio_clear_locks(net);
1050                rio_pw_enable(mport, 1);
1051        } else {
1052                printk(KERN_INFO "RIO: master port %d link inactive\n",
1053                       mport->id);
1054                rc = -EINVAL;
1055        }
1056
1057      out:
1058        return rc;
1059}
1060
1061/**
1062 * rio_build_route_tables- Generate route tables from switch route entries
1063 * @net: RIO network to run route tables scan on
1064 *
1065 * For each switch device, generate a route table by copying existing
1066 * route entries from the switch.
1067 */
1068static void rio_build_route_tables(struct rio_net *net)
1069{
1070        struct rio_switch *rswitch;
1071        struct rio_dev *rdev;
1072        int i;
1073        u8 sport;
1074
1075        list_for_each_entry(rswitch, &net->switches, node) {
1076                rdev = sw_to_rio_dev(rswitch);
1077
1078                rio_lock_device(net->hport, rdev->destid,
1079                                rdev->hopcount, 1000);
1080                for (i = 0;
1081                     i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1082                     i++) {
1083                        if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1084                                                i, &sport, 0) < 0)
1085                                continue;
1086                        rswitch->route_table[i] = sport;
1087                }
1088
1089                rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1090        }
1091}
1092
1093/**
1094 * rio_disc_mport- Start discovery through a master port
1095 * @mport: Master port to send transactions
1096 * @flags: discovery control flags
1097 *
1098 * Starts the discovery process. If we have an active link,
1099 * then wait for the signal that enumeration is complete (if wait
1100 * is allowed).
1101 * When enumeration completion is signaled, start recursive
1102 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1103 * on failure.
1104 */
1105static int rio_disc_mport(struct rio_mport *mport, u32 flags)
1106{
1107        struct rio_net *net = NULL;
1108        unsigned long to_end;
1109
1110        printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1111               mport->name);
1112
1113        /* If master port has an active link, allocate net and discover peers */
1114        if (rio_mport_is_active(mport)) {
1115                if (rio_enum_complete(mport))
1116                        goto enum_done;
1117                else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1118                        return -EAGAIN;
1119
1120                pr_debug("RIO: wait for enumeration to complete...\n");
1121
1122                to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1123                while (time_before(jiffies, to_end)) {
1124                        if (rio_enum_complete(mport))
1125                                goto enum_done;
1126                        msleep(10);
1127                }
1128
1129                pr_debug("RIO: discovery timeout on mport %d %s\n",
1130                         mport->id, mport->name);
1131                goto bail;
1132enum_done:
1133                pr_debug("RIO: ... enumeration done\n");
1134
1135                net = rio_alloc_net(mport, 0, 0);
1136                if (!net) {
1137                        printk(KERN_ERR "RIO: Failed to allocate new net\n");
1138                        goto bail;
1139                }
1140
1141                /* Read DestID assigned by enumerator */
1142                rio_local_read_config_32(mport, RIO_DID_CSR,
1143                                         &mport->host_deviceid);
1144                mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1145                                                   mport->host_deviceid);
1146
1147                if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1148                                        0, NULL, 0) < 0) {
1149                        printk(KERN_INFO
1150                               "RIO: master port %d device has failed discovery\n",
1151                               mport->id);
1152                        goto bail;
1153                }
1154
1155                rio_build_route_tables(net);
1156        }
1157
1158        return 0;
1159bail:
1160        return -EBUSY;
1161}
1162
1163static struct rio_scan rio_scan_ops = {
1164        .owner = THIS_MODULE,
1165        .enumerate = rio_enum_mport,
1166        .discover = rio_disc_mport,
1167};
1168
1169static bool scan;
1170module_param(scan, bool, 0);
1171MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1172                        "(default = 0)");
1173
1174/**
1175 * rio_basic_attach:
1176 *
1177 * When this enumeration/discovery method is loaded as a module this function
1178 * registers its specific enumeration and discover routines for all available
1179 * RapidIO mport devices. The "scan" command line parameter controls ability of
1180 * the module to start RapidIO enumeration/discovery automatically.
1181 *
1182 * Returns 0 for success or -EIO if unable to register itself.
1183 *
1184 * This enumeration/discovery method cannot be unloaded and therefore does not
1185 * provide a matching cleanup_module routine.
1186 */
1187
1188static int __init rio_basic_attach(void)
1189{
1190        if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1191                return -EIO;
1192        if (scan)
1193                rio_init_mports();
1194        return 0;
1195}
1196
1197late_initcall(rio_basic_attach);
1198
1199MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1200MODULE_LICENSE("GPL");
1201
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.