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  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15
  16 #include <linux/delay.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/init.h>
  19 #include <linux/rio.h>
  20 #include <linux/rio_drv.h>
  21 #include <linux/rio_ids.h>
  22 #include <linux/rio_regs.h>
  23 #include <linux/module.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/timer.h>
  26 #include <linux/jiffies.h>
  27 #include <linux/slab.h>
  28
  29 #include "rio.h"
  30
  31 LIST_HEAD(rio_devices);
  32 static LIST_HEAD(rio_switches);
  33
  34 #define RIO_ENUM_CMPL_MAGIC     0xdeadbeef
  35
  36 static void rio_enum_timeout(unsigned long);
  37
  38 DEFINE_SPINLOCK(rio_global_list_lock);
  39
  40 static int next_destid = 0;
  41 static int next_switchid = 0;
  42 static int next_net = 0;
  43
  44 static struct timer_list rio_enum_timer =
  45 TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
  46
  47 static int rio_mport_phys_table[] = {
  48         RIO_EFB_PAR_EP_ID,
  49         RIO_EFB_PAR_EP_REC_ID,
  50         RIO_EFB_SER_EP_ID,
  51         RIO_EFB_SER_EP_REC_ID,
  52         -1,
  53 };
  54
  55 static int rio_sport_phys_table[] = {
  56         RIO_EFB_PAR_EP_FREE_ID,
  57         RIO_EFB_SER_EP_FREE_ID,
  58         RIO_EFB_SER_EP_FREC_ID,
  59         -1,
  60 };
  61
  62 /**
  63  * rio_get_device_id - Get the base/extended device id for a device
  64  * @port: RIO master port
  65  * @destid: Destination ID of device
  66  * @hopcount: Hopcount to device
  67  *
  68  * Reads the base/extended device id from a device. Returns the
  69  * 8/16-bit device ID.
  70  */
  71 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
  72 {
  73         u32 result;
  74
  75         rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
  76
  77         return RIO_GET_DID(port->sys_size, result);
  78 }
  79
  80 /**
  81  * rio_set_device_id - Set the base/extended device id for a device
  82  * @port: RIO master port
  83  * @destid: Destination ID of device
  84  * @hopcount: Hopcount to device
  85  * @did: Device ID value to be written
  86  *
  87  * Writes the base/extended device id from a device.
  88  */
  89 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
  90 {
  91         rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
  92                                   RIO_SET_DID(port->sys_size, did));
  93 }
  94
  95 /**
  96  * rio_local_set_device_id - Set the base/extended device id for a port
  97  * @port: RIO master port
  98  * @did: Device ID value to be written
  99  *
 100  * Writes the base/extended device id from a device.
 101  */
 102 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
 103 {
 104         rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
 105                                 did));
 106 }
 107
 108 /**
 109  * rio_clear_locks- Release all host locks and signal enumeration complete
 110  * @port: Master port to issue transaction
 111  *
 112  * Marks the component tag CSR on each device with the enumeration
 113  * complete flag. When complete, it then release the host locks on
 114  * each device. Returns 0 on success or %-EINVAL on failure.
 115  */
 116 static int rio_clear_locks(struct rio_mport *port)
 117 {
 118         struct rio_dev *rdev;
 119         u32 result;
 120         int ret = 0;
 121
 122         /* Write component tag CSR magic complete value */
 123         rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR,
 124                                   RIO_ENUM_CMPL_MAGIC);
 125         list_for_each_entry(rdev, &rio_devices, global_list)
 126             rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR,
 127                                 RIO_ENUM_CMPL_MAGIC);
 128
 129         /* Release host device id locks */
 130         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 131                                   port->host_deviceid);
 132         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 133         if ((result & 0xffff) != 0xffff) {
 134                 printk(KERN_INFO
 135                        "RIO: badness when releasing host lock on master port, result %8.8x\n",
 136                        result);
 137                 ret = -EINVAL;
 138         }
 139         list_for_each_entry(rdev, &rio_devices, global_list) {
 140                 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
 141                                     port->host_deviceid);
 142                 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
 143                 if ((result & 0xffff) != 0xffff) {
 144                         printk(KERN_INFO
 145                                "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
 146                                rdev->vid, rdev->did);
 147                         ret = -EINVAL;
 148                 }
 149         }
 150
 151         return ret;
 152 }
 153
 154 /**
 155  * rio_enum_host- Set host lock and initialize host destination ID
 156  * @port: Master port to issue transaction
 157  *
 158  * Sets the local host master port lock and destination ID register
 159  * with the host device ID value. The host device ID value is provided
 160  * by the platform. Returns %0 on success or %-1 on failure.
 161  */
 162 static int rio_enum_host(struct rio_mport *port)
 163 {
 164         u32 result;
 165
 166         /* Set master port host device id lock */
 167         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 168                                   port->host_deviceid);
 169
 170         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 171         if ((result & 0xffff) != port->host_deviceid)
 172                 return -1;
 173
 174         /* Set master port destid and init destid ctr */
 175         rio_local_set_device_id(port, port->host_deviceid);
 176
 177         if (next_destid == port->host_deviceid)
 178                 next_destid++;
 179
 180         return 0;
 181 }
 182
 183 /**
 184  * rio_device_has_destid- Test if a device contains a destination ID register
 185  * @port: Master port to issue transaction
 186  * @src_ops: RIO device source operations
 187  * @dst_ops: RIO device destination operations
 188  *
 189  * Checks the provided @src_ops and @dst_ops for the necessary transaction
 190  * capabilities that indicate whether or not a device will implement a
 191  * destination ID register. Returns 1 if true or 0 if false.
 192  */
 193 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
 194                                  int dst_ops)
 195 {
 196         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;
 197
 198         return !!((src_ops | dst_ops) & mask);
 199 }
 200
 201 /**
 202  * rio_release_dev- Frees a RIO device struct
 203  * @dev: LDM device associated with a RIO device struct
 204  *
 205  * Gets the RIO device struct associated a RIO device struct.
 206  * The RIO device struct is freed.
 207  */
 208 static void rio_release_dev(struct device *dev)
 209 {
 210         struct rio_dev *rdev;
 211
 212         rdev = to_rio_dev(dev);
 213         kfree(rdev);
 214 }
 215
 216 /**
 217  * rio_is_switch- Tests if a RIO device has switch capabilities
 218  * @rdev: RIO device
 219  *
 220  * Gets the RIO device Processing Element Features register
 221  * contents and tests for switch capabilities. Returns 1 if
 222  * the device is a switch or 0 if it is not a switch.
 223  * The RIO device struct is freed.
 224  */
 225 static int rio_is_switch(struct rio_dev *rdev)
 226 {
 227         if (rdev->pef & RIO_PEF_SWITCH)
 228                 return 1;
 229         return 0;
 230 }
 231
 232 /**
 233  * rio_route_set_ops- Sets routing operations for a particular vendor switch
 234  * @rdev: RIO device
 235  *
 236  * Searches the RIO route ops table for known switch types. If the vid
 237  * and did match a switch table entry, then set the add_entry() and
 238  * get_entry() ops to the table entry values.
 239  */
 240 static void rio_route_set_ops(struct rio_dev *rdev)
 241 {
 242         struct rio_route_ops *cur = __start_rio_route_ops;
 243         struct rio_route_ops *end = __end_rio_route_ops;
 244
 245         while (cur < end) {
 246                 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
 247                         pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev));
 248                         rdev->rswitch->add_entry = cur->add_hook;
 249                         rdev->rswitch->get_entry = cur->get_hook;
 250                         rdev->rswitch->clr_table = cur->clr_hook;
 251                         break;
 252                 }
 253                 cur++;
 254         }
 255
 256         if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
 257                 pr_debug("RIO: adding STD routing ops for %s\n",
 258                         rio_name(rdev));
 259                 rdev->rswitch->add_entry = rio_std_route_add_entry;
 260                 rdev->rswitch->get_entry = rio_std_route_get_entry;
 261                 rdev->rswitch->clr_table = rio_std_route_clr_table;
 262         }
 263
 264         if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
 265                 printk(KERN_ERR "RIO: missing routing ops for %s\n",
 266                        rio_name(rdev));
 267 }
 268
 269 /**
 270  * rio_add_device- Adds a RIO device to the device model
 271  * @rdev: RIO device
 272  *
 273  * Adds the RIO device to the global device list and adds the RIO
 274  * device to the RIO device list.  Creates the generic sysfs nodes
 275  * for an RIO device.
 276  */
 277 static int __devinit rio_add_device(struct rio_dev *rdev)
 278 {
 279         int err;
 280
 281         err = device_add(&rdev->dev);
 282         if (err)
 283                 return err;
 284
 285         spin_lock(&rio_global_list_lock);
 286         list_add_tail(&rdev->global_list, &rio_devices);
 287         spin_unlock(&rio_global_list_lock);
 288
 289         rio_create_sysfs_dev_files(rdev);
 290
 291         return 0;
 292 }
 293
 294 /**
 295  * rio_setup_device- Allocates and sets up a RIO device
 296  * @net: RIO network
 297  * @port: Master port to send transactions
 298  * @destid: Current destination ID
 299  * @hopcount: Current hopcount
 300  * @do_enum: Enumeration/Discovery mode flag
 301  *
 302  * Allocates a RIO device and configures fields based on configuration
 303  * space contents. If device has a destination ID register, a destination
 304  * ID is either assigned in enumeration mode or read from configuration
 305  * space in discovery mode.  If the device has switch capabilities, then
 306  * a switch is allocated and configured appropriately. Returns a pointer
 307  * to a RIO device on success or NULL on failure.
 308  *
 309  */
 310 static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
 311                                         struct rio_mport *port, u16 destid,
 312                                         u8 hopcount, int do_enum)
 313 {
 314         int ret = 0;
 315         struct rio_dev *rdev;
 316         struct rio_switch *rswitch = NULL;
 317         int result, rdid;
 318
 319         rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL);
 320         if (!rdev)
 321                 return NULL;
 322
 323         rdev->net = net;
 324         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
 325                                  &result);
 326         rdev->did = result >> 16;
 327         rdev->vid = result & 0xffff;
 328         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
 329                                  &rdev->device_rev);
 330         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
 331                                  &result);
 332         rdev->asm_did = result >> 16;
 333         rdev->asm_vid = result & 0xffff;
 334         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
 335                                  &result);
 336         rdev->asm_rev = result >> 16;
 337         rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
 338                                  &rdev->pef);
 339         if (rdev->pef & RIO_PEF_EXT_FEATURES)
 340                 rdev->efptr = result & 0xffff;
 341
 342         rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
 343                                  &rdev->src_ops);
 344         rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
 345                                  &rdev->dst_ops);
 346
 347         if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
 348                 if (do_enum) {
 349                         rio_set_device_id(port, destid, hopcount, next_destid);
 350                         rdev->destid = next_destid++;
 351                         if (next_destid == port->host_deviceid)
 352                                 next_destid++;
 353                 } else
 354                         rdev->destid = rio_get_device_id(port, destid, hopcount);
 355         } else
 356                 /* Switch device has an associated destID */
 357                 rdev->destid = RIO_INVALID_DESTID;
 358
 359         /* If a PE has both switch and other functions, show it as a switch */
 360         if (rio_is_switch(rdev)) {
 361                 rio_mport_read_config_32(port, destid, hopcount,
 362                                          RIO_SWP_INFO_CAR, &rdev->swpinfo);
 363                 rswitch = kzalloc(sizeof(struct rio_switch), GFP_KERNEL);
 364                 if (!rswitch)
 365                         goto cleanup;
 366                 rswitch->switchid = next_switchid;
 367                 rswitch->hopcount = hopcount;
 368                 rswitch->destid = destid;
 369                 rswitch->route_table = kzalloc(sizeof(u8)*
 370                                         RIO_MAX_ROUTE_ENTRIES(port->sys_size),
 371                                         GFP_KERNEL);
 372                 if (!rswitch->route_table)
 373                         goto cleanup;
 374                 /* Initialize switch route table */
 375                 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
 376                                 rdid++)
 377                         rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
 378                 rdev->rswitch = rswitch;
 379                 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
 380                              rdev->rswitch->switchid);
 381                 rio_route_set_ops(rdev);
 382
 383                 if (do_enum && rdev->rswitch->clr_table)
 384                         rdev->rswitch->clr_table(port, destid, hopcount,
 385                                                  RIO_GLOBAL_TABLE);
 386
 387                 list_add_tail(&rswitch->node, &rio_switches);
 388
 389         } else
 390                 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
 391                              rdev->destid);
 392
 393         rdev->dev.bus = &rio_bus_type;
 394
 395         device_initialize(&rdev->dev);
 396         rdev->dev.release = rio_release_dev;
 397         rio_dev_get(rdev);
 398
 399         rdev->dma_mask = DMA_BIT_MASK(32);
 400         rdev->dev.dma_mask = &rdev->dma_mask;
 401         rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 402
 403         if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
 404             (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
 405                 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 406                                    0, 0xffff);
 407
 408         ret = rio_add_device(rdev);
 409         if (ret)
 410                 goto cleanup;
 411
 412         return rdev;
 413
 414 cleanup:
 415         if (rswitch) {
 416                 kfree(rswitch->route_table);
 417                 kfree(rswitch);
 418         }
 419         kfree(rdev);
 420         return NULL;
 421 }
 422
 423 /**
 424  * rio_sport_is_active- Tests if a switch port has an active connection.
 425  * @port: Master port to send transaction
 426  * @destid: Associated destination ID for switch
 427  * @hopcount: Hopcount to reach switch
 428  * @sport: Switch port number
 429  *
 430  * Reads the port error status CSR for a particular switch port to
 431  * determine if the port has an active link.  Returns
 432  * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
 433  * inactive.
 434  */
 435 static int
 436 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
 437 {
 438         u32 result;
 439         u32 ext_ftr_ptr;
 440
 441         int *entry = rio_sport_phys_table;
 442
 443         do {
 444                 if ((ext_ftr_ptr =
 445                      rio_mport_get_feature(port, 0, destid, hopcount, *entry)))
 446
 447                         break;
 448         } while (*++entry >= 0);
 449
 450         if (ext_ftr_ptr)
 451                 rio_mport_read_config_32(port, destid, hopcount,
 452                                          ext_ftr_ptr +
 453                                          RIO_PORT_N_ERR_STS_CSR(sport),
 454                                          &result);
 455
 456         return (result & PORT_N_ERR_STS_PORT_OK);
 457 }
 458
 459 /**
 460  * rio_lock_device - Acquires host device lock for specified device
 461  * @port: Master port to send transaction
 462  * @destid: Destination ID for device/switch
 463  * @hopcount: Hopcount to reach switch
 464  * @wait_ms: Max wait time in msec (0 = no timeout)
 465  *
 466  * Attepts to acquire host device lock for specified device
 467  * Returns 0 if device lock acquired or EINVAL if timeout expires.
 468  */
 469 static int
 470 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
 471 {
 472         u32 result;
 473         int tcnt = 0;
 474
 475         /* Attempt to acquire device lock */
 476         rio_mport_write_config_32(port, destid, hopcount,
 477                                   RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 478         rio_mport_read_config_32(port, destid, hopcount,
 479                                  RIO_HOST_DID_LOCK_CSR, &result);
 480
 481         while (result != port->host_deviceid) {
 482                 if (wait_ms != 0 && tcnt == wait_ms) {
 483                         pr_debug("RIO: timeout when locking device %x:%x\n",
 484                                 destid, hopcount);
 485                         return -EINVAL;
 486                 }
 487
 488                 /* Delay a bit */
 489                 mdelay(1);
 490                 tcnt++;
 491                 /* Try to acquire device lock again */
 492                 rio_mport_write_config_32(port, destid,
 493                         hopcount,
 494                         RIO_HOST_DID_LOCK_CSR,
 495                         port->host_deviceid);
 496                 rio_mport_read_config_32(port, destid,
 497                         hopcount,
 498                         RIO_HOST_DID_LOCK_CSR, &result);
 499         }
 500
 501         return 0;
 502 }
 503
 504 /**
 505  * rio_unlock_device - Releases host device lock for specified device
 506  * @port: Master port to send transaction
 507  * @destid: Destination ID for device/switch
 508  * @hopcount: Hopcount to reach switch
 509  *
 510  * Returns 0 if device lock released or EINVAL if fails.
 511  */
 512 static int
 513 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
 514 {
 515         u32 result;
 516
 517         /* Release device lock */
 518         rio_mport_write_config_32(port, destid,
 519                                   hopcount,
 520                                   RIO_HOST_DID_LOCK_CSR,
 521                                   port->host_deviceid);
 522         rio_mport_read_config_32(port, destid, hopcount,
 523                 RIO_HOST_DID_LOCK_CSR, &result);
 524         if ((result & 0xffff) != 0xffff) {
 525                 pr_debug("RIO: badness when releasing device lock %x:%x\n",
 526                          destid, hopcount);
 527                 return -EINVAL;
 528         }
 529
 530         return 0;
 531 }
 532
 533 /**
 534  * rio_route_add_entry- Add a route entry to a switch routing table
 535  * @mport: Master port to send transaction
 536  * @rswitch: Switch device
 537  * @table: Routing table ID
 538  * @route_destid: Destination ID to be routed
 539  * @route_port: Port number to be routed
 540  * @lock: lock switch device flag
 541  *
 542  * Calls the switch specific add_entry() method to add a route entry
 543  * on a switch. The route table can be specified using the @table
 544  * argument if a switch has per port routing tables or the normal
 545  * use is to specific all tables (or the global table) by passing
 546  * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 547  * on failure.
 548  */
 549 static int
 550 rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch,
 551                     u16 table, u16 route_destid, u8 route_port, int lock)
 552 {
 553         int rc;
 554
 555         if (lock) {
 556                 rc = rio_lock_device(mport, rswitch->destid,
 557                                      rswitch->hopcount, 1000);
 558                 if (rc)
 559                         return rc;
 560         }
 561
 562         rc = rswitch->add_entry(mport, rswitch->destid,
 563                                         rswitch->hopcount, table,
 564                                         route_destid, route_port);
 565         if (lock)
 566                 rio_unlock_device(mport, rswitch->destid, rswitch->hopcount);
 567
 568         return rc;
 569 }
 570
 571 /**
 572  * rio_route_get_entry- Read a route entry in a switch routing table
 573  * @mport: Master port to send transaction
 574  * @rswitch: Switch device
 575  * @table: Routing table ID
 576  * @route_destid: Destination ID to be routed
 577  * @route_port: Pointer to read port number into
 578  * @lock: lock switch device flag
 579  *
 580  * Calls the switch specific get_entry() method to read a route entry
 581  * in a switch. The route table can be specified using the @table
 582  * argument if a switch has per port routing tables or the normal
 583  * use is to specific all tables (or the global table) by passing
 584  * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 585  * on failure.
 586  */
 587 static int
 588 rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table,
 589                     u16 route_destid, u8 *route_port, int lock)
 590 {
 591         int rc;
 592
 593         if (lock) {
 594                 rc = rio_lock_device(mport, rswitch->destid,
 595                                      rswitch->hopcount, 1000);
 596                 if (rc)
 597                         return rc;
 598         }
 599
 600         rc = rswitch->get_entry(mport, rswitch->destid,
 601                                         rswitch->hopcount, table,
 602                                         route_destid, route_port);
 603         if (lock)
 604                 rio_unlock_device(mport, rswitch->destid, rswitch->hopcount);
 605
 606         return rc;
 607 }
 608
 609 /**
 610  * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
 611  * @port: Master port to send transaction
 612  * @hopcount: Number of hops to the device
 613  *
 614  * Used during enumeration to read the Host Device ID Lock CSR on a
 615  * RIO device. Returns the value of the lock register.
 616  */
 617 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
 618 {
 619         u32 result;
 620
 621         rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
 622                                  RIO_HOST_DID_LOCK_CSR, &result);
 623
 624         return (u16) (result & 0xffff);
 625 }
 626
 627 /**
 628  * rio_get_swpinfo_inport- Gets the ingress port number
 629  * @mport: Master port to send transaction
 630  * @destid: Destination ID associated with the switch
 631  * @hopcount: Number of hops to the device
 632  *
 633  * Returns port number being used to access the switch device.
 634  */
 635 static u8
 636 rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount)
 637 {
 638         u32 result;
 639
 640         rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
 641                                  &result);
 642
 643         return (u8) (result & 0xff);
 644 }
 645
 646 /**
 647  * rio_get_swpinfo_tports- Gets total number of ports on the switch
 648  * @mport: Master port to send transaction
 649  * @destid: Destination ID associated with the switch
 650  * @hopcount: Number of hops to the device
 651  *
 652  * Returns total numbers of ports implemented by the switch device.
 653  */
 654 static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid,
 655                                  u8 hopcount)
 656 {
 657         u32 result;
 658
 659         rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
 660                                  &result);
 661
 662         return RIO_GET_TOTAL_PORTS(result);
 663 }
 664
 665 /**
 666  * rio_net_add_mport- Add a master port to a RIO network
 667  * @net: RIO network
 668  * @port: Master port to add
 669  *
 670  * Adds a master port to the network list of associated master
 671  * ports..
 672  */
 673 static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port)
 674 {
 675         spin_lock(&rio_global_list_lock);
 676         list_add_tail(&port->nnode, &net->mports);
 677         spin_unlock(&rio_global_list_lock);
 678 }
 679
 680 /**
 681  * rio_enum_peer- Recursively enumerate a RIO network through a master port
 682  * @net: RIO network being enumerated
 683  * @port: Master port to send transactions
 684  * @hopcount: Number of hops into the network
 685  *
 686  * Recursively enumerates a RIO network.  Transactions are sent via the
 687  * master port passed in @port.
 688  */
 689 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 690                          u8 hopcount)
 691 {
 692         int port_num;
 693         int num_ports;
 694         int cur_destid;
 695         int sw_destid;
 696         int sw_inport;
 697         struct rio_dev *rdev;
 698         u16 destid;
 699         int tmp;
 700
 701         if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 702                 pr_debug("RIO: PE already discovered by this host\n");
 703                 /*
 704                  * Already discovered by this host. Add it as another
 705                  * master port for the current network.
 706                  */
 707                 rio_net_add_mport(net, port);
 708                 return 0;
 709         }
 710
 711         /* Attempt to acquire device lock */
 712         rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 713                                   hopcount,
 714                                   RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 715         while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
 716                < port->host_deviceid) {
 717                 /* Delay a bit */
 718                 mdelay(1);
 719                 /* Attempt to acquire device lock again */
 720                 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 721                                           hopcount,
 722                                           RIO_HOST_DID_LOCK_CSR,
 723                                           port->host_deviceid);
 724         }
 725
 726         if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
 727                 pr_debug(
 728                     "RIO: PE locked by a higher priority host...retreating\n");
 729                 return -1;
 730         }
 731
 732         /* Setup new RIO device */
 733         rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
 734                                         hopcount, 1);
 735         if (rdev) {
 736                 /* Add device to the global and bus/net specific list. */
 737                 list_add_tail(&rdev->net_list, &net->devices);
 738         } else
 739                 return -1;
 740
 741         if (rio_is_switch(rdev)) {
 742                 next_switchid++;
 743                 sw_inport = rio_get_swpinfo_inport(port,
 744                                 RIO_ANY_DESTID(port->sys_size), hopcount);
 745                 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
 746                                     port->host_deviceid, sw_inport, 0);
 747                 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
 748
 749                 for (destid = 0; destid < next_destid; destid++) {
 750                         if (destid == port->host_deviceid)
 751                                 continue;
 752                         rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
 753                                             destid, sw_inport, 0);
 754                         rdev->rswitch->route_table[destid] = sw_inport;
 755                 }
 756
 757                 num_ports =
 758                     rio_get_swpinfo_tports(port, RIO_ANY_DESTID(port->sys_size),
 759                                                 hopcount);
 760                 pr_debug(
 761                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 762                     rio_name(rdev), rdev->vid, rdev->did, num_ports);
 763                 sw_destid = next_destid;
 764                 for (port_num = 0; port_num < num_ports; port_num++) {
 765                         if (sw_inport == port_num)
 766                                 continue;
 767
 768                         cur_destid = next_destid;
 769
 770                         if (rio_sport_is_active
 771                             (port, RIO_ANY_DESTID(port->sys_size), hopcount,
 772                              port_num)) {
 773                                 pr_debug(
 774                                     "RIO: scanning device on port %d\n",
 775                                     port_num);
 776                                 rio_route_add_entry(port, rdev->rswitch,
 777                                                 RIO_GLOBAL_TABLE,
 778                                                 RIO_ANY_DESTID(port->sys_size),
 779                                                 port_num, 0);
 780
 781                                 if (rio_enum_peer(net, port, hopcount + 1) < 0)
 782                                         return -1;
 783
 784                                 /* Update routing tables */
 785                                 if (next_destid > cur_destid) {
 786                                         for (destid = cur_destid;
 787                                              destid < next_destid; destid++) {
 788                                                 if (destid == port->host_deviceid)
 789                                                         continue;
 790                                                 rio_route_add_entry(port, rdev->rswitch,
 791                                                                     RIO_GLOBAL_TABLE,
 792                                                                     destid,
 793                                                                     port_num,
 794                                                                     0);
 795                                                 rdev->rswitch->
 796                                                     route_table[destid] =
 797                                                     port_num;
 798                                         }
 799                                 }
 800                         }
 801                 }
 802
 803                 /* Check for empty switch */
 804                 if (next_destid == sw_destid) {
 805                         next_destid++;
 806                         if (next_destid == port->host_deviceid)
 807                                 next_destid++;
 808                 }
 809
 810                 rdev->rswitch->destid = sw_destid;
 811         } else
 812                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 813                     rio_name(rdev), rdev->vid, rdev->did);
 814
 815         return 0;
 816 }
 817
 818 /**
 819  * rio_enum_complete- Tests if enumeration of a network is complete
 820  * @port: Master port to send transaction
 821  *
 822  * Tests the Component Tag CSR for presence of the magic enumeration
 823  * complete flag. Return %1 if enumeration is complete or %0 if
 824  * enumeration is incomplete.
 825  */
 826 static int rio_enum_complete(struct rio_mport *port)
 827 {
 828         u32 tag_csr;
 829         int ret = 0;
 830
 831         rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr);
 832
 833         if (tag_csr == RIO_ENUM_CMPL_MAGIC)
 834                 ret = 1;
 835
 836         return ret;
 837 }
 838
 839 /**
 840  * rio_disc_peer- Recursively discovers a RIO network through a master port
 841  * @net: RIO network being discovered
 842  * @port: Master port to send transactions
 843  * @destid: Current destination ID in network
 844  * @hopcount: Number of hops into the network
 845  *
 846  * Recursively discovers a RIO network.  Transactions are sent via the
 847  * master port passed in @port.
 848  */
 849 static int __devinit
 850 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
 851               u8 hopcount)
 852 {
 853         u8 port_num, route_port;
 854         int num_ports;
 855         struct rio_dev *rdev;
 856         u16 ndestid;
 857
 858         /* Setup new RIO device */
 859         if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
 860                 /* Add device to the global and bus/net specific list. */
 861                 list_add_tail(&rdev->net_list, &net->devices);
 862         } else
 863                 return -1;
 864
 865         if (rio_is_switch(rdev)) {
 866                 next_switchid++;
 867
 868                 /* Associated destid is how we accessed this switch */
 869                 rdev->rswitch->destid = destid;
 870
 871                 num_ports = rio_get_swpinfo_tports(port, destid, hopcount);
 872                 pr_debug(
 873                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 874                     rio_name(rdev), rdev->vid, rdev->did, num_ports);
 875                 for (port_num = 0; port_num < num_ports; port_num++) {
 876                         if (rio_get_swpinfo_inport(port, destid, hopcount) ==
 877                             port_num)
 878                                 continue;
 879
 880                         if (rio_sport_is_active
 881                             (port, destid, hopcount, port_num)) {
 882                                 pr_debug(
 883                                     "RIO: scanning device on port %d\n",
 884                                     port_num);
 885
 886                                 rio_lock_device(port, destid, hopcount, 1000);
 887
 888                                 for (ndestid = 0;
 889                                      ndestid < RIO_ANY_DESTID(port->sys_size);
 890                                      ndestid++) {
 891                                         rio_route_get_entry(port, rdev->rswitch,
 892                                                             RIO_GLOBAL_TABLE,
 893                                                             ndestid,
 894                                                             &route_port, 0);
 895                                         if (route_port == port_num)
 896                                                 break;
 897                                 }
 898
 899                                 rio_unlock_device(port, destid, hopcount);
 900                                 if (rio_disc_peer
 901                                     (net, port, ndestid, hopcount + 1) < 0)
 902                                         return -1;
 903                         }
 904                 }
 905         } else
 906                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 907                     rio_name(rdev), rdev->vid, rdev->did);
 908
 909         return 0;
 910 }
 911
 912 /**
 913  * rio_mport_is_active- Tests if master port link is active
 914  * @port: Master port to test
 915  *
 916  * Reads the port error status CSR for the master port to
 917  * determine if the port has an active link.  Returns
 918  * %PORT_N_ERR_STS_PORT_OK if the  master port is active
 919  * or %0 if it is inactive.
 920  */
 921 static int rio_mport_is_active(struct rio_mport *port)
 922 {
 923         u32 result = 0;
 924         u32 ext_ftr_ptr;
 925         int *entry = rio_mport_phys_table;
 926
 927         do {
 928                 if ((ext_ftr_ptr =
 929                      rio_mport_get_feature(port, 1, 0, 0, *entry)))
 930                         break;
 931         } while (*++entry >= 0);
 932
 933         if (ext_ftr_ptr)
 934                 rio_local_read_config_32(port,
 935                                          ext_ftr_ptr +
 936                                          RIO_PORT_N_ERR_STS_CSR(port->index),
 937                                          &result);
 938
 939         return (result & PORT_N_ERR_STS_PORT_OK);
 940 }
 941
 942 /**
 943  * rio_alloc_net- Allocate and configure a new RIO network
 944  * @port: Master port associated with the RIO network
 945  *
 946  * Allocates a RIO network structure, initializes per-network
 947  * list heads, and adds the associated master port to the
 948  * network list of associated master ports. Returns a
 949  * RIO network pointer on success or %NULL on failure.
 950  */
 951 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
 952 {
 953         struct rio_net *net;
 954
 955         net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
 956         if (net) {
 957                 INIT_LIST_HEAD(&net->node);
 958                 INIT_LIST_HEAD(&net->devices);
 959                 INIT_LIST_HEAD(&net->mports);
 960                 list_add_tail(&port->nnode, &net->mports);
 961                 net->hport = port;
 962                 net->id = next_net++;
 963         }
 964         return net;
 965 }
 966
 967 /**
 968  * rio_update_route_tables- Updates route tables in switches
 969  * @port: Master port associated with the RIO network
 970  *
 971  * For each enumerated device, ensure that each switch in a system
 972  * has correct routing entries. Add routes for devices that where
 973  * unknown dirung the first enumeration pass through the switch.
 974  */
 975 static void rio_update_route_tables(struct rio_mport *port)
 976 {
 977         struct rio_dev *rdev;
 978         struct rio_switch *rswitch;
 979         u8 sport;
 980         u16 destid;
 981
 982         list_for_each_entry(rdev, &rio_devices, global_list) {
 983
 984                 destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid;
 985
 986                 list_for_each_entry(rswitch, &rio_switches, node) {
 987
 988                         if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
 989                                 continue;
 990
 991                         if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
 992                                 /* Skip if destid ends in empty switch*/
 993                                 if (rswitch->destid == destid)
 994                                         continue;
 995
 996                                 sport = rio_get_swpinfo_inport(port,
 997                                                 rswitch->destid, rswitch->hopcount);
 998
 999                                 if (rswitch->add_entry) {
1000                                         rio_route_add_entry(port, rswitch,
1001                                                 RIO_GLOBAL_TABLE, destid,
1002                                                 sport, 0);
1003                                         rswitch->route_table[destid] = sport;
1004                                 }
1005                         }
1006                 }
1007         }
1008 }
1009
1010 /**
1011  * rio_enum_mport- Start enumeration through a master port
1012  * @mport: Master port to send transactions
1013  *
1014  * Starts the enumeration process. If somebody has enumerated our
1015  * master port device, then give up. If not and we have an active
1016  * link, then start recursive peer enumeration. Returns %0 if
1017  * enumeration succeeds or %-EBUSY if enumeration fails.
1018  */
1019 int __devinit rio_enum_mport(struct rio_mport *mport)
1020 {
1021         struct rio_net *net = NULL;
1022         int rc = 0;
1023
1024         printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1025                mport->name);
1026         /* If somebody else enumerated our master port device, bail. */
1027         if (rio_enum_host(mport) < 0) {
1028                 printk(KERN_INFO
1029                        "RIO: master port %d device has been enumerated by a remote host\n",
1030                        mport->id);
1031                 rc = -EBUSY;
1032                 goto out;
1033         }
1034
1035         /* If master port has an active link, allocate net and enum peers */
1036         if (rio_mport_is_active(mport)) {
1037                 if (!(net = rio_alloc_net(mport))) {
1038                         printk(KERN_ERR "RIO: failed to allocate new net\n");
1039                         rc = -ENOMEM;
1040                         goto out;
1041                 }
1042                 if (rio_enum_peer(net, mport, 0) < 0) {
1043                         /* A higher priority host won enumeration, bail. */
1044                         printk(KERN_INFO
1045                                "RIO: master port %d device has lost enumeration to a remote host\n",
1046                                mport->id);
1047                         rio_clear_locks(mport);
1048                         rc = -EBUSY;
1049                         goto out;
1050                 }
1051                 rio_update_route_tables(mport);
1052                 rio_clear_locks(mport);
1053         } else {
1054                 printk(KERN_INFO "RIO: master port %d link inactive\n",
1055                        mport->id);
1056                 rc = -EINVAL;
1057         }
1058
1059       out:
1060         return rc;
1061 }
1062
1063 /**
1064  * rio_build_route_tables- Generate route tables from switch route entries
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(void)
1070 {
1071         struct rio_dev *rdev;
1072         int i;
1073         u8 sport;
1074
1075         list_for_each_entry(rdev, &rio_devices, global_list)
1076                 if (rio_is_switch(rdev)) {
1077                         rio_lock_device(rdev->net->hport, rdev->rswitch->destid,
1078                                         rdev->rswitch->hopcount, 1000);
1079                         for (i = 0;
1080                              i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1081                              i++) {
1082                                 if (rio_route_get_entry
1083                                     (rdev->net->hport, rdev->rswitch,
1084                                      RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1085                                         continue;
1086                                 rdev->rswitch->route_table[i] = sport;
1087                         }
1088
1089                         rio_unlock_device(rdev->net->hport,
1090                                           rdev->rswitch->destid,
1091                                           rdev->rswitch->hopcount);
1092                 }
1093 }
1094
1095 /**
1096  * rio_enum_timeout- Signal that enumeration timed out
1097  * @data: Address of timeout flag.
1098  *
1099  * When the enumeration complete timer expires, set a flag that
1100  * signals to the discovery process that enumeration did not
1101  * complete in a sane amount of time.
1102  */
1103 static void rio_enum_timeout(unsigned long data)
1104 {
1105         /* Enumeration timed out, set flag */
1106         *(int *)data = 1;
1107 }
1108
1109 /**
1110  * rio_disc_mport- Start discovery through a master port
1111  * @mport: Master port to send transactions
1112  *
1113  * Starts the discovery process. If we have an active link,
1114  * then wait for the signal that enumeration is complete.
1115  * When enumeration completion is signaled, start recursive
1116  * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1117  * on failure.
1118  */
1119 int __devinit rio_disc_mport(struct rio_mport *mport)
1120 {
1121         struct rio_net *net = NULL;
1122         int enum_timeout_flag = 0;
1123
1124         printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1125                mport->name);
1126
1127         /* If master port has an active link, allocate net and discover peers */
1128         if (rio_mport_is_active(mport)) {
1129                 if (!(net = rio_alloc_net(mport))) {
1130                         printk(KERN_ERR "RIO: Failed to allocate new net\n");
1131                         goto bail;
1132                 }
1133
1134                 pr_debug("RIO: wait for enumeration complete...");
1135
1136                 rio_enum_timer.expires =
1137                     jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1138                 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1139                 add_timer(&rio_enum_timer);
1140                 while (!rio_enum_complete(mport)) {
1141                         mdelay(1);
1142                         if (enum_timeout_flag) {
1143                                 del_timer_sync(&rio_enum_timer);
1144                                 goto timeout;
1145                         }
1146                 }
1147                 del_timer_sync(&rio_enum_timer);
1148
1149                 pr_debug("done\n");
1150
1151                 /* Read DestID assigned by enumerator */
1152                 rio_local_read_config_32(mport, RIO_DID_CSR,
1153                                          &mport->host_deviceid);
1154                 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1155                                                    mport->host_deviceid);
1156
1157                 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1158                                         0) < 0) {
1159                         printk(KERN_INFO
1160                                "RIO: master port %d device has failed discovery\n",
1161                                mport->id);
1162                         goto bail;
1163                 }
1164
1165                 rio_build_route_tables();
1166         }
1167
1168         return 0;
1169
1170       timeout:
1171         pr_debug("timeout\n");
1172       bail:
1173         return -EBUSY;
1174 }