drivers/rapidio/rio-scan.c

   1 /*
   2  * RapidIO enumeration and discovery support
   3  *
   4  * Copyright 2005 MontaVista Software, Inc.
   5  * Matt Porter <mporter@kernel.crashing.org>
   6  *
   7  * Copyright 2009 Integrated Device Technology, Inc.
   8  * Alex Bounine <alexandre.bounine@idt.com>
   9  * - Added Port-Write/Error Management initialization and handling
  10  *
  11  * Copyright 2009 Sysgo AG
  12  * Thomas Moll <thomas.moll@sysgo.com>
  13  * - Added Input- Output- enable functionality, to allow full communication
  14  *
  15  * This program is free software; you can redistribute  it and/or modify it
  16  * under  the terms of  the GNU General  Public License as published by the
  17  * Free Software Foundation;  either version 2 of the  License, or (at your
  18  * option) any later version.
  19  */
  20
  21 #include <linux/types.h>
  22 #include <linux/kernel.h>
  23
  24 #include <linux/delay.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/init.h>
  27 #include <linux/rio.h>
  28 #include <linux/rio_drv.h>
  29 #include <linux/rio_ids.h>
  30 #include <linux/rio_regs.h>
  31 #include <linux/module.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/timer.h>
  34 #include <linux/sched.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/slab.h>
  37
  38 #include "rio.h"
  39
  40 static void rio_init_em(struct rio_dev *rdev);
  41
  42 static int next_destid = 0;
  43 static int next_comptag = 1;
  44
  45 static 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  */
  62 static 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 successful.
  87  */
  88 static 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  */
 107 static 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  */
 121 static 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  */
 141 static 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  */
 165 static 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  */
 183 static 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  */
 196 static 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  */
 210 static 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  */
 259 static 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  */
 286 static 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  */
 301 static 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  */
 318 static 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  */
 341 static 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         rdev->dev.parent = &port->dev;
 465         rio_attach_device(rdev);
 466
 467         device_initialize(&rdev->dev);
 468         rdev->dev.release = rio_release_dev;
 469         rio_dev_get(rdev);
 470
 471         rdev->dma_mask = DMA_BIT_MASK(32);
 472         rdev->dev.dma_mask = &rdev->dma_mask;
 473         rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 474
 475         if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
 476                 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 477                                    0, 0xffff);
 478
 479         ret = rio_add_device(rdev);
 480         if (ret)
 481                 goto cleanup;
 482
 483         return rdev;
 484
 485 cleanup:
 486         if (rswitch)
 487                 kfree(rswitch->route_table);
 488
 489         kfree(rdev);
 490         return NULL;
 491 }
 492
 493 /**
 494  * rio_sport_is_active- Tests if a switch port has an active connection.
 495  * @port: Master port to send transaction
 496  * @destid: Associated destination ID for switch
 497  * @hopcount: Hopcount to reach switch
 498  * @sport: Switch port number
 499  *
 500  * Reads the port error status CSR for a particular switch port to
 501  * determine if the port has an active link.  Returns
 502  * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
 503  * inactive.
 504  */
 505 static int
 506 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
 507 {
 508         u32 result = 0;
 509         u32 ext_ftr_ptr;
 510
 511         ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
 512
 513         while (ext_ftr_ptr) {
 514                 rio_mport_read_config_32(port, destid, hopcount,
 515                                          ext_ftr_ptr, &result);
 516                 result = RIO_GET_BLOCK_ID(result);
 517                 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
 518                     (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
 519                     (result == RIO_EFB_SER_EP_FREC_ID))
 520                         break;
 521
 522                 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
 523                                                 ext_ftr_ptr);
 524         }
 525
 526         if (ext_ftr_ptr)
 527                 rio_mport_read_config_32(port, destid, hopcount,
 528                                          ext_ftr_ptr +
 529                                          RIO_PORT_N_ERR_STS_CSR(sport),
 530                                          &result);
 531
 532         return result & RIO_PORT_N_ERR_STS_PORT_OK;
 533 }
 534
 535 /**
 536  * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
 537  * @port: Master port to send transaction
 538  * @hopcount: Number of hops to the device
 539  *
 540  * Used during enumeration to read the Host Device ID Lock CSR on a
 541  * RIO device. Returns the value of the lock register.
 542  */
 543 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
 544 {
 545         u32 result;
 546
 547         rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
 548                                  RIO_HOST_DID_LOCK_CSR, &result);
 549
 550         return (u16) (result & 0xffff);
 551 }
 552
 553 /**
 554  * rio_enum_peer- Recursively enumerate a RIO network through a master port
 555  * @net: RIO network being enumerated
 556  * @port: Master port to send transactions
 557  * @hopcount: Number of hops into the network
 558  * @prev: Previous RIO device connected to the enumerated one
 559  * @prev_port: Port on previous RIO device
 560  *
 561  * Recursively enumerates a RIO network.  Transactions are sent via the
 562  * master port passed in @port.
 563  */
 564 static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 565                          u8 hopcount, struct rio_dev *prev, int prev_port)
 566 {
 567         struct rio_dev *rdev;
 568         u32 regval;
 569         int tmp;
 570
 571         if (rio_mport_chk_dev_access(port,
 572                         RIO_ANY_DESTID(port->sys_size), hopcount)) {
 573                 pr_debug("RIO: device access check failed\n");
 574                 return -1;
 575         }
 576
 577         if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 578                 pr_debug("RIO: PE already discovered by this host\n");
 579                 /*
 580                  * Already discovered by this host. Add it as another
 581                  * link to the existing device.
 582                  */
 583                 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
 584                                 hopcount, RIO_COMPONENT_TAG_CSR, &regval);
 585
 586                 if (regval) {
 587                         rdev = rio_get_comptag((regval & 0xffff), NULL);
 588
 589                         if (rdev && prev && rio_is_switch(prev)) {
 590                                 pr_debug("RIO: redundant path to %s\n",
 591                                          rio_name(rdev));
 592                                 prev->rswitch->nextdev[prev_port] = rdev;
 593                         }
 594                 }
 595
 596                 return 0;
 597         }
 598
 599         /* Attempt to acquire device lock */
 600         rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 601                                   hopcount,
 602                                   RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 603         while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
 604                < port->host_deviceid) {
 605                 /* Delay a bit */
 606                 mdelay(1);
 607                 /* Attempt to acquire device lock again */
 608                 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 609                                           hopcount,
 610                                           RIO_HOST_DID_LOCK_CSR,
 611                                           port->host_deviceid);
 612         }
 613
 614         if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
 615                 pr_debug(
 616                     "RIO: PE locked by a higher priority host...retreating\n");
 617                 return -1;
 618         }
 619
 620         /* Setup new RIO device */
 621         rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
 622                                         hopcount, 1);
 623         if (rdev) {
 624                 /* Add device to the global and bus/net specific list. */
 625                 list_add_tail(&rdev->net_list, &net->devices);
 626                 rdev->prev = prev;
 627                 if (prev && rio_is_switch(prev))
 628                         prev->rswitch->nextdev[prev_port] = rdev;
 629         } else
 630                 return -1;
 631
 632         if (rio_is_switch(rdev)) {
 633                 int sw_destid;
 634                 int cur_destid;
 635                 int sw_inport;
 636                 u16 destid;
 637                 int port_num;
 638
 639                 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
 640                 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 641                                     port->host_deviceid, sw_inport, 0);
 642                 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
 643
 644                 destid = rio_destid_first(net);
 645                 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
 646                         if (destid != port->host_deviceid) {
 647                                 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 648                                                     destid, sw_inport, 0);
 649                                 rdev->rswitch->route_table[destid] = sw_inport;
 650                         }
 651                         destid = rio_destid_next(net, destid + 1);
 652                 }
 653                 pr_debug(
 654                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 655                     rio_name(rdev), rdev->vid, rdev->did,
 656                     RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 657                 sw_destid = next_destid;
 658                 for (port_num = 0;
 659                      port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 660                      port_num++) {
 661                         if (sw_inport == port_num) {
 662                                 rio_enable_rx_tx_port(port, 0,
 663                                               RIO_ANY_DESTID(port->sys_size),
 664                                               hopcount, port_num);
 665                                 rdev->rswitch->port_ok |= (1 << port_num);
 666                                 continue;
 667                         }
 668
 669                         cur_destid = next_destid;
 670
 671                         if (rio_sport_is_active
 672                             (port, RIO_ANY_DESTID(port->sys_size), hopcount,
 673                              port_num)) {
 674                                 pr_debug(
 675                                     "RIO: scanning device on port %d\n",
 676                                     port_num);
 677                                 rio_enable_rx_tx_port(port, 0,
 678                                               RIO_ANY_DESTID(port->sys_size),
 679                                               hopcount, port_num);
 680                                 rdev->rswitch->port_ok |= (1 << port_num);
 681                                 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 682                                                 RIO_ANY_DESTID(port->sys_size),
 683                                                 port_num, 0);
 684
 685                                 if (rio_enum_peer(net, port, hopcount + 1,
 686                                                   rdev, port_num) < 0)
 687                                         return -1;
 688
 689                                 /* Update routing tables */
 690                                 destid = rio_destid_next(net, cur_destid + 1);
 691                                 if (destid != RIO_INVALID_DESTID) {
 692                                         for (destid = cur_destid;
 693                                              destid < next_destid;) {
 694                                                 if (destid != port->host_deviceid) {
 695                                                         rio_route_add_entry(rdev,
 696                                                                     RIO_GLOBAL_TABLE,
 697                                                                     destid,
 698                                                                     port_num,
 699                                                                     0);
 700                                                         rdev->rswitch->
 701                                                                 route_table[destid] =
 702                                                                 port_num;
 703                                                 }
 704                                                 destid = rio_destid_next(net,
 705                                                                 destid + 1);
 706                                         }
 707                                 }
 708                         } else {
 709                                 /* If switch supports Error Management,
 710                                  * set PORT_LOCKOUT bit for unused port
 711                                  */
 712                                 if (rdev->em_efptr)
 713                                         rio_set_port_lockout(rdev, port_num, 1);
 714
 715                                 rdev->rswitch->port_ok &= ~(1 << port_num);
 716                         }
 717                 }
 718
 719                 /* Direct Port-write messages to the enumeratiing host */
 720                 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
 721                     (rdev->em_efptr)) {
 722                         rio_write_config_32(rdev,
 723                                         rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
 724                                         (port->host_deviceid << 16) |
 725                                         (port->sys_size << 15));
 726                 }
 727
 728                 rio_init_em(rdev);
 729
 730                 /* Check for empty switch */
 731                 if (next_destid == sw_destid)
 732                         next_destid = rio_destid_alloc(net);
 733
 734                 rdev->destid = sw_destid;
 735         } else
 736                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 737                     rio_name(rdev), rdev->vid, rdev->did);
 738
 739         return 0;
 740 }
 741
 742 /**
 743  * rio_enum_complete- Tests if enumeration of a network is complete
 744  * @port: Master port to send transaction
 745  *
 746  * Tests the PGCCSR discovered bit for non-zero value (enumeration
 747  * complete flag). Return %1 if enumeration is complete or %0 if
 748  * enumeration is incomplete.
 749  */
 750 static int rio_enum_complete(struct rio_mport *port)
 751 {
 752         u32 regval;
 753
 754         rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 755                                  &regval);
 756         return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
 757 }
 758
 759 /**
 760  * rio_disc_peer- Recursively discovers a RIO network through a master port
 761  * @net: RIO network being discovered
 762  * @port: Master port to send transactions
 763  * @destid: Current destination ID in network
 764  * @hopcount: Number of hops into the network
 765  * @prev: previous rio_dev
 766  * @prev_port: previous port number
 767  *
 768  * Recursively discovers a RIO network.  Transactions are sent via the
 769  * master port passed in @port.
 770  */
 771 static int
 772 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
 773               u8 hopcount, struct rio_dev *prev, int prev_port)
 774 {
 775         u8 port_num, route_port;
 776         struct rio_dev *rdev;
 777         u16 ndestid;
 778
 779         /* Setup new RIO device */
 780         if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
 781                 /* Add device to the global and bus/net specific list. */
 782                 list_add_tail(&rdev->net_list, &net->devices);
 783                 rdev->prev = prev;
 784                 if (prev && rio_is_switch(prev))
 785                         prev->rswitch->nextdev[prev_port] = rdev;
 786         } else
 787                 return -1;
 788
 789         if (rio_is_switch(rdev)) {
 790                 /* Associated destid is how we accessed this switch */
 791                 rdev->destid = destid;
 792
 793                 pr_debug(
 794                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 795                     rio_name(rdev), rdev->vid, rdev->did,
 796                     RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 797                 for (port_num = 0;
 798                      port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 799                      port_num++) {
 800                         if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
 801                                 continue;
 802
 803                         if (rio_sport_is_active
 804                             (port, destid, hopcount, port_num)) {
 805                                 pr_debug(
 806                                     "RIO: scanning device on port %d\n",
 807                                     port_num);
 808
 809                                 rio_lock_device(port, destid, hopcount, 1000);
 810
 811                                 for (ndestid = 0;
 812                                      ndestid < RIO_ANY_DESTID(port->sys_size);
 813                                      ndestid++) {
 814                                         rio_route_get_entry(rdev,
 815                                                             RIO_GLOBAL_TABLE,
 816                                                             ndestid,
 817                                                             &route_port, 0);
 818                                         if (route_port == port_num)
 819                                                 break;
 820                                 }
 821
 822                                 if (ndestid == RIO_ANY_DESTID(port->sys_size))
 823                                         continue;
 824                                 rio_unlock_device(port, destid, hopcount);
 825                                 if (rio_disc_peer(net, port, ndestid,
 826                                         hopcount + 1, rdev, port_num) < 0)
 827                                         return -1;
 828                         }
 829                 }
 830         } else
 831                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 832                     rio_name(rdev), rdev->vid, rdev->did);
 833
 834         return 0;
 835 }
 836
 837 /**
 838  * rio_mport_is_active- Tests if master port link is active
 839  * @port: Master port to test
 840  *
 841  * Reads the port error status CSR for the master port to
 842  * determine if the port has an active link.  Returns
 843  * %RIO_PORT_N_ERR_STS_PORT_OK if the  master port is active
 844  * or %0 if it is inactive.
 845  */
 846 static int rio_mport_is_active(struct rio_mport *port)
 847 {
 848         u32 result = 0;
 849         u32 ext_ftr_ptr;
 850         int *entry = rio_mport_phys_table;
 851
 852         do {
 853                 if ((ext_ftr_ptr =
 854                      rio_mport_get_feature(port, 1, 0, 0, *entry)))
 855                         break;
 856         } while (*++entry >= 0);
 857
 858         if (ext_ftr_ptr)
 859                 rio_local_read_config_32(port,
 860                                          ext_ftr_ptr +
 861                                          RIO_PORT_N_ERR_STS_CSR(port->index),
 862                                          &result);
 863
 864         return result & RIO_PORT_N_ERR_STS_PORT_OK;
 865 }
 866
 867 /**
 868  * rio_alloc_net- Allocate and configure a new RIO network
 869  * @port: Master port associated with the RIO network
 870  * @do_enum: Enumeration/Discovery mode flag
 871  * @start: logical minimal start id for new net
 872  *
 873  * Allocates a RIO network structure, initializes per-network
 874  * list heads, and adds the associated master port to the
 875  * network list of associated master ports. Returns a
 876  * RIO network pointer on success or %NULL on failure.
 877  */
 878 static struct rio_net *rio_alloc_net(struct rio_mport *port,
 879                                                int do_enum, u16 start)
 880 {
 881         struct rio_net *net;
 882
 883         net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
 884         if (net && do_enum) {
 885                 net->destid_table.table = kcalloc(
 886                         BITS_TO_LONGS(RIO_MAX_ROUTE_ENTRIES(port->sys_size)),
 887                         sizeof(long),
 888                         GFP_KERNEL);
 889
 890                 if (net->destid_table.table == NULL) {
 891                         pr_err("RIO: failed to allocate destID table\n");
 892                         kfree(net);
 893                         net = NULL;
 894                 } else {
 895                         net->destid_table.start = start;
 896                         net->destid_table.max =
 897                                         RIO_MAX_ROUTE_ENTRIES(port->sys_size);
 898                         spin_lock_init(&net->destid_table.lock);
 899                 }
 900         }
 901
 902         if (net) {
 903                 INIT_LIST_HEAD(&net->node);
 904                 INIT_LIST_HEAD(&net->devices);
 905                 INIT_LIST_HEAD(&net->switches);
 906                 INIT_LIST_HEAD(&net->mports);
 907                 list_add_tail(&port->nnode, &net->mports);
 908                 net->hport = port;
 909                 net->id = port->id;
 910         }
 911         return net;
 912 }
 913
 914 /**
 915  * rio_update_route_tables- Updates route tables in switches
 916  * @net: RIO network to run update on
 917  *
 918  * For each enumerated device, ensure that each switch in a system
 919  * has correct routing entries. Add routes for devices that where
 920  * unknown dirung the first enumeration pass through the switch.
 921  */
 922 static void rio_update_route_tables(struct rio_net *net)
 923 {
 924         struct rio_dev *rdev, *swrdev;
 925         struct rio_switch *rswitch;
 926         u8 sport;
 927         u16 destid;
 928
 929         list_for_each_entry(rdev, &net->devices, net_list) {
 930
 931                 destid = rdev->destid;
 932
 933                 list_for_each_entry(rswitch, &net->switches, node) {
 934
 935                         if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
 936                                 continue;
 937
 938                         if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
 939                                 swrdev = sw_to_rio_dev(rswitch);
 940
 941                                 /* Skip if destid ends in empty switch*/
 942                                 if (swrdev->destid == destid)
 943                                         continue;
 944
 945                                 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
 946
 947                                 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
 948                                                     destid, sport, 0);
 949                                 rswitch->route_table[destid] = sport;
 950                         }
 951                 }
 952         }
 953 }
 954
 955 /**
 956  * rio_init_em - Initializes RIO Error Management (for switches)
 957  * @rdev: RIO device
 958  *
 959  * For each enumerated switch, call device-specific error management
 960  * initialization routine (if supplied by the switch driver).
 961  */
 962 static void rio_init_em(struct rio_dev *rdev)
 963 {
 964         if (rio_is_switch(rdev) && (rdev->em_efptr) &&
 965             rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
 966                 rdev->rswitch->ops->em_init(rdev);
 967         }
 968 }
 969
 970 /**
 971  * rio_pw_enable - Enables/disables port-write handling by a master port
 972  * @port: Master port associated with port-write handling
 973  * @enable:  1=enable,  0=disable
 974  */
 975 static void rio_pw_enable(struct rio_mport *port, int enable)
 976 {
 977         if (port->ops->pwenable)
 978                 port->ops->pwenable(port, enable);
 979 }
 980
 981 /**
 982  * rio_enum_mport- Start enumeration through a master port
 983  * @mport: Master port to send transactions
 984  * @flags: Enumeration control flags
 985  *
 986  * Starts the enumeration process. If somebody has enumerated our
 987  * master port device, then give up. If not and we have an active
 988  * link, then start recursive peer enumeration. Returns %0 if
 989  * enumeration succeeds or %-EBUSY if enumeration fails.
 990  */
 991 static int rio_enum_mport(struct rio_mport *mport, u32 flags)
 992 {
 993         struct rio_net *net = NULL;
 994         int rc = 0;
 995
 996         printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
 997                mport->name);
 998
 999         /*
1000          * To avoid multiple start requests (repeat enumeration is not supported
1001          * by this method) check if enumeration/discovery was performed for this
1002          * mport: if mport was added into the list of mports for a net exit
1003          * with error.
1004          */
1005         if (mport->nnode.next || mport->nnode.prev)
1006                 return -EBUSY;
1007
1008         /* If somebody else enumerated our master port device, bail. */
1009         if (rio_enum_host(mport) < 0) {
1010                 printk(KERN_INFO
1011                        "RIO: master port %d device has been enumerated by a remote host\n",
1012                        mport->id);
1013                 rc = -EBUSY;
1014                 goto out;
1015         }
1016
1017         /* If master port has an active link, allocate net and enum peers */
1018         if (rio_mport_is_active(mport)) {
1019                 net = rio_alloc_net(mport, 1, 0);
1020                 if (!net) {
1021                         printk(KERN_ERR "RIO: failed to allocate new net\n");
1022                         rc = -ENOMEM;
1023                         goto out;
1024                 }
1025
1026                 /* reserve mport destID in new net */
1027                 rio_destid_reserve(net, mport->host_deviceid);
1028
1029                 /* Enable Input Output Port (transmitter reviever) */
1030                 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1031
1032                 /* Set component tag for host */
1033                 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1034                                           next_comptag++);
1035
1036                 next_destid = rio_destid_alloc(net);
1037
1038                 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1039                         /* A higher priority host won enumeration, bail. */
1040                         printk(KERN_INFO
1041                                "RIO: master port %d device has lost enumeration to a remote host\n",
1042                                mport->id);
1043                         rio_clear_locks(net);
1044                         rc = -EBUSY;
1045                         goto out;
1046                 }
1047                 /* free the last allocated destID (unused) */
1048                 rio_destid_free(net, next_destid);
1049                 rio_update_route_tables(net);
1050                 rio_clear_locks(net);
1051                 rio_pw_enable(mport, 1);
1052         } else {
1053                 printk(KERN_INFO "RIO: master port %d link inactive\n",
1054                        mport->id);
1055                 rc = -EINVAL;
1056         }
1057
1058       out:
1059         return rc;
1060 }
1061
1062 /**
1063  * rio_build_route_tables- Generate route tables from switch route entries
1064  * @net: RIO network to run route tables scan on
1065  *
1066  * For each switch device, generate a route table by copying existing
1067  * route entries from the switch.
1068  */
1069 static void rio_build_route_tables(struct rio_net *net)
1070 {
1071         struct rio_switch *rswitch;
1072         struct rio_dev *rdev;
1073         int i;
1074         u8 sport;
1075
1076         list_for_each_entry(rswitch, &net->switches, node) {
1077                 rdev = sw_to_rio_dev(rswitch);
1078
1079                 rio_lock_device(net->hport, rdev->destid,
1080                                 rdev->hopcount, 1000);
1081                 for (i = 0;
1082                      i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1083                      i++) {
1084                         if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1085                                                 i, &sport, 0) < 0)
1086                                 continue;
1087                         rswitch->route_table[i] = sport;
1088                 }
1089
1090                 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1091         }
1092 }
1093
1094 /**
1095  * rio_disc_mport- Start discovery through a master port
1096  * @mport: Master port to send transactions
1097  * @flags: discovery control flags
1098  *
1099  * Starts the discovery process. If we have an active link,
1100  * then wait for the signal that enumeration is complete (if wait
1101  * is allowed).
1102  * When enumeration completion is signaled, start recursive
1103  * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1104  * on failure.
1105  */
1106 static int rio_disc_mport(struct rio_mport *mport, u32 flags)
1107 {
1108         struct rio_net *net = NULL;
1109         unsigned long to_end;
1110
1111         printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1112                mport->name);
1113
1114         /* If master port has an active link, allocate net and discover peers */
1115         if (rio_mport_is_active(mport)) {
1116                 if (rio_enum_complete(mport))
1117                         goto enum_done;
1118                 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1119                         return -EAGAIN;
1120
1121                 pr_debug("RIO: wait for enumeration to complete...\n");
1122
1123                 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1124                 while (time_before(jiffies, to_end)) {
1125                         if (rio_enum_complete(mport))
1126                                 goto enum_done;
1127                         msleep(10);
1128                 }
1129
1130                 pr_debug("RIO: discovery timeout on mport %d %s\n",
1131                          mport->id, mport->name);
1132                 goto bail;
1133 enum_done:
1134                 pr_debug("RIO: ... enumeration done\n");
1135
1136                 net = rio_alloc_net(mport, 0, 0);
1137                 if (!net) {
1138                         printk(KERN_ERR "RIO: Failed to allocate new net\n");
1139                         goto bail;
1140                 }
1141
1142                 /* Read DestID assigned by enumerator */
1143                 rio_local_read_config_32(mport, RIO_DID_CSR,
1144                                          &mport->host_deviceid);
1145                 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1146                                                    mport->host_deviceid);
1147
1148                 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1149                                         0, NULL, 0) < 0) {
1150                         printk(KERN_INFO
1151                                "RIO: master port %d device has failed discovery\n",
1152                                mport->id);
1153                         goto bail;
1154                 }
1155
1156                 rio_build_route_tables(net);
1157         }
1158
1159         return 0;
1160 bail:
1161         return -EBUSY;
1162 }
1163
1164 static struct rio_scan rio_scan_ops = {
1165         .owner = THIS_MODULE,
1166         .enumerate = rio_enum_mport,
1167         .discover = rio_disc_mport,
1168 };
1169
1170 static bool scan;
1171 module_param(scan, bool, 0);
1172 MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1173                         "(default = 0)");
1174
1175 /**
1176  * rio_basic_attach:
1177  *
1178  * When this enumeration/discovery method is loaded as a module this function
1179  * registers its specific enumeration and discover routines for all available
1180  * RapidIO mport devices. The "scan" command line parameter controls ability of
1181  * the module to start RapidIO enumeration/discovery automatically.
1182  *
1183  * Returns 0 for success or -EIO if unable to register itself.
1184  *
1185  * This enumeration/discovery method cannot be unloaded and therefore does not
1186  * provide a matching cleanup_module routine.
1187  */
1188
1189 static int __init rio_basic_attach(void)
1190 {
1191         if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1192                 return -EIO;
1193         if (scan)
1194                 rio_init_mports();
1195         return 0;
1196 }
1197
1198 late_initcall(rio_basic_attach);
1199
1200 MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1201 MODULE_LICENSE("GPL");