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         -1,
  59 };
  60
  61 /**
  62  * rio_get_device_id - Get the base/extended device id for a device
  63  * @port: RIO master port
  64  * @destid: Destination ID of device
  65  * @hopcount: Hopcount to device
  66  *
  67  * Reads the base/extended device id from a device. Returns the
  68  * 8/16-bit device ID.
  69  */
  70 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
  71 {
  72         u32 result;
  73
  74         rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
  75
  76         return RIO_GET_DID(result);
  77 }
  78
  79 /**
  80  * rio_set_device_id - Set the base/extended device id for a device
  81  * @port: RIO master port
  82  * @destid: Destination ID of device
  83  * @hopcount: Hopcount to device
  84  * @did: Device ID value to be written
  85  *
  86  * Writes the base/extended device id from a device.
  87  */
  88 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
  89 {
  90         rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
  91                                   RIO_SET_DID(did));
  92 }
  93
  94 /**
  95  * rio_local_set_device_id - Set the base/extended device id for a port
  96  * @port: RIO master port
  97  * @did: Device ID value to be written
  98  *
  99  * Writes the base/extended device id from a device.
 100  */
 101 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
 102 {
 103         rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(did));
 104 }
 105
 106 /**
 107  * rio_clear_locks- Release all host locks and signal enumeration complete
 108  * @port: Master port to issue transaction
 109  *
 110  * Marks the component tag CSR on each device with the enumeration
 111  * complete flag. When complete, it then release the host locks on
 112  * each device. Returns 0 on success or %-EINVAL on failure.
 113  */
 114 static int rio_clear_locks(struct rio_mport *port)
 115 {
 116         struct rio_dev *rdev;
 117         u32 result;
 118         int ret = 0;
 119
 120         /* Write component tag CSR magic complete value */
 121         rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR,
 122                                   RIO_ENUM_CMPL_MAGIC);
 123         list_for_each_entry(rdev, &rio_devices, global_list)
 124             rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR,
 125                                 RIO_ENUM_CMPL_MAGIC);
 126
 127         /* Release host device id locks */
 128         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 129                                   port->host_deviceid);
 130         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 131         if ((result & 0xffff) != 0xffff) {
 132                 printk(KERN_INFO
 133                        "RIO: badness when releasing host lock on master port, result %8.8x\n",
 134                        result);
 135                 ret = -EINVAL;
 136         }
 137         list_for_each_entry(rdev, &rio_devices, global_list) {
 138                 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
 139                                     port->host_deviceid);
 140                 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
 141                 if ((result & 0xffff) != 0xffff) {
 142                         printk(KERN_INFO
 143                                "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
 144                                rdev->vid, rdev->did);
 145                         ret = -EINVAL;
 146                 }
 147         }
 148
 149         return ret;
 150 }
 151
 152 /**
 153  * rio_enum_host- Set host lock and initialize host destination ID
 154  * @port: Master port to issue transaction
 155  *
 156  * Sets the local host master port lock and destination ID register
 157  * with the host device ID value. The host device ID value is provided
 158  * by the platform. Returns %0 on success or %-1 on failure.
 159  */
 160 static int rio_enum_host(struct rio_mport *port)
 161 {
 162         u32 result;
 163
 164         /* Set master port host device id lock */
 165         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 166                                   port->host_deviceid);
 167
 168         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 169         if ((result & 0xffff) != port->host_deviceid)
 170                 return -1;
 171
 172         /* Set master port destid and init destid ctr */
 173         rio_local_set_device_id(port, port->host_deviceid);
 174
 175         if (next_destid == port->host_deviceid)
 176                 next_destid++;
 177
 178         return 0;
 179 }
 180
 181 /**
 182  * rio_device_has_destid- Test if a device contains a destination ID register
 183  * @port: Master port to issue transaction
 184  * @src_ops: RIO device source operations
 185  * @dst_ops: RIO device destination operations
 186  *
 187  * Checks the provided @src_ops and @dst_ops for the necessary transaction
 188  * capabilities that indicate whether or not a device will implement a
 189  * destination ID register. Returns 1 if true or 0 if false.
 190  */
 191 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
 192                                  int dst_ops)
 193 {
 194         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;
 195
 196         return !!((src_ops | dst_ops) & mask);
 197 }
 198
 199 /**
 200  * rio_release_dev- Frees a RIO device struct
 201  * @dev: LDM device associated with a RIO device struct
 202  *
 203  * Gets the RIO device struct associated a RIO device struct.
 204  * The RIO device struct is freed.
 205  */
 206 static void rio_release_dev(struct device *dev)
 207 {
 208         struct rio_dev *rdev;
 209
 210         rdev = to_rio_dev(dev);
 211         kfree(rdev);
 212 }
 213
 214 /**
 215  * rio_is_switch- Tests if a RIO device has switch capabilities
 216  * @rdev: RIO device
 217  *
 218  * Gets the RIO device Processing Element Features register
 219  * contents and tests for switch capabilities. Returns 1 if
 220  * the device is a switch or 0 if it is not a switch.
 221  * The RIO device struct is freed.
 222  */
 223 static int rio_is_switch(struct rio_dev *rdev)
 224 {
 225         if (rdev->pef & RIO_PEF_SWITCH)
 226                 return 1;
 227         return 0;
 228 }
 229
 230 /**
 231  * rio_route_set_ops- Sets routing operations for a particular vendor switch
 232  * @rdev: RIO device
 233  *
 234  * Searches the RIO route ops table for known switch types. If the vid
 235  * and did match a switch table entry, then set the add_entry() and
 236  * get_entry() ops to the table entry values.
 237  */
 238 static void rio_route_set_ops(struct rio_dev *rdev)
 239 {
 240         struct rio_route_ops *cur = __start_rio_route_ops;
 241         struct rio_route_ops *end = __end_rio_route_ops;
 242
 243         while (cur < end) {
 244                 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
 245                         pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev));
 246                         rdev->rswitch->add_entry = cur->add_hook;
 247                         rdev->rswitch->get_entry = cur->get_hook;
 248                 }
 249                 cur++;
 250         }
 251
 252         if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
 253                 printk(KERN_ERR "RIO: missing routing ops for %s\n",
 254                        rio_name(rdev));
 255 }
 256
 257 /**
 258  * rio_add_device- Adds a RIO device to the device model
 259  * @rdev: RIO device
 260  *
 261  * Adds the RIO device to the global device list and adds the RIO
 262  * device to the RIO device list.  Creates the generic sysfs nodes
 263  * for an RIO device.
 264  */
 265 static void __devinit rio_add_device(struct rio_dev *rdev)
 266 {
 267         device_add(&rdev->dev);
 268
 269         spin_lock(&rio_global_list_lock);
 270         list_add_tail(&rdev->global_list, &rio_devices);
 271         spin_unlock(&rio_global_list_lock);
 272
 273         rio_create_sysfs_dev_files(rdev);
 274 }
 275
 276 /**
 277  * rio_setup_device- Allocates and sets up a RIO device
 278  * @net: RIO network
 279  * @port: Master port to send transactions
 280  * @destid: Current destination ID
 281  * @hopcount: Current hopcount
 282  * @do_enum: Enumeration/Discovery mode flag
 283  *
 284  * Allocates a RIO device and configures fields based on configuration
 285  * space contents. If device has a destination ID register, a destination
 286  * ID is either assigned in enumeration mode or read from configuration
 287  * space in discovery mode.  If the device has switch capabilities, then
 288  * a switch is allocated and configured appropriately. Returns a pointer
 289  * to a RIO device on success or NULL on failure.
 290  *
 291  */
 292 static struct rio_dev *rio_setup_device(struct rio_net *net,
 293                                         struct rio_mport *port, u16 destid,
 294                                         u8 hopcount, int do_enum)
 295 {
 296         struct rio_dev *rdev;
 297         struct rio_switch *rswitch;
 298         int result, rdid;
 299
 300         rdev = kmalloc(sizeof(struct rio_dev), GFP_KERNEL);
 301         if (!rdev)
 302                 goto out;
 303
 304         memset(rdev, 0, sizeof(struct rio_dev));
 305         rdev->net = net;
 306         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
 307                                  &result);
 308         rdev->did = result >> 16;
 309         rdev->vid = result & 0xffff;
 310         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
 311                                  &rdev->device_rev);
 312         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
 313                                  &result);
 314         rdev->asm_did = result >> 16;
 315         rdev->asm_vid = result & 0xffff;
 316         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
 317                                  &result);
 318         rdev->asm_rev = result >> 16;
 319         rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
 320                                  &rdev->pef);
 321         if (rdev->pef & RIO_PEF_EXT_FEATURES)
 322                 rdev->efptr = result & 0xffff;
 323
 324         rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
 325                                  &rdev->src_ops);
 326         rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
 327                                  &rdev->dst_ops);
 328
 329         if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
 330                 if (do_enum) {
 331                         rio_set_device_id(port, destid, hopcount, next_destid);
 332                         rdev->destid = next_destid++;
 333                         if (next_destid == port->host_deviceid)
 334                                 next_destid++;
 335                 } else
 336                         rdev->destid = rio_get_device_id(port, destid, hopcount);
 337         } else
 338                 /* Switch device has an associated destID */
 339                 rdev->destid = RIO_INVALID_DESTID;
 340
 341         /* If a PE has both switch and other functions, show it as a switch */
 342         if (rio_is_switch(rdev)) {
 343                 rio_mport_read_config_32(port, destid, hopcount,
 344                                          RIO_SWP_INFO_CAR, &rdev->swpinfo);
 345                 rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL);
 346                 if (!rswitch) {
 347                         kfree(rdev);
 348                         rdev = NULL;
 349                         goto out;
 350                 }
 351                 rswitch->switchid = next_switchid;
 352                 rswitch->hopcount = hopcount;
 353                 rswitch->destid = destid;
 354                 /* Initialize switch route table */
 355                 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES; rdid++)
 356                         rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
 357                 rdev->rswitch = rswitch;
 358                 sprintf(rio_name(rdev), "%02x:s:%04x", rdev->net->id,
 359                         rdev->rswitch->switchid);
 360                 rio_route_set_ops(rdev);
 361
 362                 list_add_tail(&rswitch->node, &rio_switches);
 363
 364         } else
 365                 sprintf(rio_name(rdev), "%02x:e:%04x", rdev->net->id,
 366                         rdev->destid);
 367
 368         rdev->dev.bus = &rio_bus_type;
 369
 370         device_initialize(&rdev->dev);
 371         rdev->dev.release = rio_release_dev;
 372         rio_dev_get(rdev);
 373
 374         rdev->dma_mask = DMA_32BIT_MASK;
 375         rdev->dev.dma_mask = &rdev->dma_mask;
 376         rdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
 377
 378         if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
 379             (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
 380                 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 381                                    0, 0xffff);
 382
 383         rio_add_device(rdev);
 384
 385       out:
 386         return rdev;
 387 }
 388
 389 /**
 390  * rio_sport_is_active- Tests if a switch port has an active connection.
 391  * @port: Master port to send transaction
 392  * @destid: Associated destination ID for switch
 393  * @hopcount: Hopcount to reach switch
 394  * @sport: Switch port number
 395  *
 396  * Reads the port error status CSR for a particular switch port to
 397  * determine if the port has an active link.  Returns
 398  * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
 399  * inactive.
 400  */
 401 static int
 402 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
 403 {
 404         u32 result;
 405         u32 ext_ftr_ptr;
 406
 407         int *entry = rio_sport_phys_table;
 408
 409         do {
 410                 if ((ext_ftr_ptr =
 411                      rio_mport_get_feature(port, 0, destid, hopcount, *entry)))
 412
 413                         break;
 414         } while (*++entry >= 0);
 415
 416         if (ext_ftr_ptr)
 417                 rio_mport_read_config_32(port, destid, hopcount,
 418                                          ext_ftr_ptr +
 419                                          RIO_PORT_N_ERR_STS_CSR(sport),
 420                                          &result);
 421
 422         return (result & PORT_N_ERR_STS_PORT_OK);
 423 }
 424
 425 /**
 426  * rio_route_add_entry- Add a route entry to a switch routing table
 427  * @mport: Master port to send transaction
 428  * @rswitch: Switch device
 429  * @table: Routing table ID
 430  * @route_destid: Destination ID to be routed
 431  * @route_port: Port number to be routed
 432  *
 433  * Calls the switch specific add_entry() method to add a route entry
 434  * on a switch. The route table can be specified using the @table
 435  * argument if a switch has per port routing tables or the normal
 436  * use is to specific all tables (or the global table) by passing
 437  * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 438  * on failure.
 439  */
 440 static int rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch,
 441                                u16 table, u16 route_destid, u8 route_port)
 442 {
 443         return rswitch->add_entry(mport, rswitch->destid,
 444                                         rswitch->hopcount, table,
 445                                         route_destid, route_port);
 446 }
 447
 448 /**
 449  * rio_route_get_entry- Read a route entry in a switch routing table
 450  * @mport: Master port to send transaction
 451  * @rswitch: Switch device
 452  * @table: Routing table ID
 453  * @route_destid: Destination ID to be routed
 454  * @route_port: Pointer to read port number into
 455  *
 456  * Calls the switch specific get_entry() method to read a route entry
 457  * in a switch. The route table can be specified using the @table
 458  * argument if a switch has per port routing tables or the normal
 459  * use is to specific all tables (or the global table) by passing
 460  * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
 461  * on failure.
 462  */
 463 static int
 464 rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table,
 465                     u16 route_destid, u8 * route_port)
 466 {
 467         return rswitch->get_entry(mport, rswitch->destid,
 468                                         rswitch->hopcount, table,
 469                                         route_destid, route_port);
 470 }
 471
 472 /**
 473  * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
 474  * @port: Master port to send transaction
 475  * @hopcount: Number of hops to the device
 476  *
 477  * Used during enumeration to read the Host Device ID Lock CSR on a
 478  * RIO device. Returns the value of the lock register.
 479  */
 480 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
 481 {
 482         u32 result;
 483
 484         rio_mport_read_config_32(port, RIO_ANY_DESTID, hopcount,
 485                                  RIO_HOST_DID_LOCK_CSR, &result);
 486
 487         return (u16) (result & 0xffff);
 488 }
 489
 490 /**
 491  * rio_get_swpinfo_inport- Gets the ingress port number
 492  * @mport: Master port to send transaction
 493  * @destid: Destination ID associated with the switch
 494  * @hopcount: Number of hops to the device
 495  *
 496  * Returns port number being used to access the switch device.
 497  */
 498 static u8
 499 rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount)
 500 {
 501         u32 result;
 502
 503         rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
 504                                  &result);
 505
 506         return (u8) (result & 0xff);
 507 }
 508
 509 /**
 510  * rio_get_swpinfo_tports- Gets total number of ports on the switch
 511  * @mport: Master port to send transaction
 512  * @destid: Destination ID associated with the switch
 513  * @hopcount: Number of hops to the device
 514  *
 515  * Returns total numbers of ports implemented by the switch device.
 516  */
 517 static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid,
 518                                  u8 hopcount)
 519 {
 520         u32 result;
 521
 522         rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
 523                                  &result);
 524
 525         return RIO_GET_TOTAL_PORTS(result);
 526 }
 527
 528 /**
 529  * rio_net_add_mport- Add a master port to a RIO network
 530  * @net: RIO network
 531  * @port: Master port to add
 532  *
 533  * Adds a master port to the network list of associated master
 534  * ports..
 535  */
 536 static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port)
 537 {
 538         spin_lock(&rio_global_list_lock);
 539         list_add_tail(&port->nnode, &net->mports);
 540         spin_unlock(&rio_global_list_lock);
 541 }
 542
 543 /**
 544  * rio_enum_peer- Recursively enumerate a RIO network through a master port
 545  * @net: RIO network being enumerated
 546  * @port: Master port to send transactions
 547  * @hopcount: Number of hops into the network
 548  *
 549  * Recursively enumerates a RIO network.  Transactions are sent via the
 550  * master port passed in @port.
 551  */
 552 static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 553                          u8 hopcount)
 554 {
 555         int port_num;
 556         int num_ports;
 557         int cur_destid;
 558         int sw_destid;
 559         int sw_inport;
 560         struct rio_dev *rdev;
 561         u16 destid;
 562         int tmp;
 563
 564         if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 565                 pr_debug("RIO: PE already discovered by this host\n");
 566                 /*
 567                  * Already discovered by this host. Add it as another
 568                  * master port for the current network.
 569                  */
 570                 rio_net_add_mport(net, port);
 571                 return 0;
 572         }
 573
 574         /* Attempt to acquire device lock */
 575         rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount,
 576                                   RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 577         while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
 578                < port->host_deviceid) {
 579                 /* Delay a bit */
 580                 mdelay(1);
 581                 /* Attempt to acquire device lock again */
 582                 rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount,
 583                                           RIO_HOST_DID_LOCK_CSR,
 584                                           port->host_deviceid);
 585         }
 586
 587         if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
 588                 pr_debug(
 589                     "RIO: PE locked by a higher priority host...retreating\n");
 590                 return -1;
 591         }
 592
 593         /* Setup new RIO device */
 594         if ((rdev = rio_setup_device(net, port, RIO_ANY_DESTID, hopcount, 1))) {
 595                 /* Add device to the global and bus/net specific list. */
 596                 list_add_tail(&rdev->net_list, &net->devices);
 597         } else
 598                 return -1;
 599
 600         if (rio_is_switch(rdev)) {
 601                 next_switchid++;
 602                 sw_inport = rio_get_swpinfo_inport(port, RIO_ANY_DESTID, hopcount);
 603                 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
 604                                     port->host_deviceid, sw_inport);
 605                 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
 606
 607                 for (destid = 0; destid < next_destid; destid++) {
 608                         if (destid == port->host_deviceid)
 609                                 continue;
 610                         rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
 611                                             destid, sw_inport);
 612                         rdev->rswitch->route_table[destid] = sw_inport;
 613                 }
 614
 615                 num_ports =
 616                     rio_get_swpinfo_tports(port, RIO_ANY_DESTID, hopcount);
 617                 pr_debug(
 618                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 619                     rio_name(rdev), rdev->vid, rdev->did, num_ports);
 620                 sw_destid = next_destid;
 621                 for (port_num = 0; port_num < num_ports; port_num++) {
 622                         if (sw_inport == port_num)
 623                                 continue;
 624
 625                         cur_destid = next_destid;
 626
 627                         if (rio_sport_is_active
 628                             (port, RIO_ANY_DESTID, hopcount, port_num)) {
 629                                 pr_debug(
 630                                     "RIO: scanning device on port %d\n",
 631                                     port_num);
 632                                 rio_route_add_entry(port, rdev->rswitch,
 633                                                     RIO_GLOBAL_TABLE,
 634                                                     RIO_ANY_DESTID, port_num);
 635
 636                                 if (rio_enum_peer(net, port, hopcount + 1) < 0)
 637                                         return -1;
 638
 639                                 /* Update routing tables */
 640                                 if (next_destid > cur_destid) {
 641                                         for (destid = cur_destid;
 642                                              destid < next_destid; destid++) {
 643                                                 if (destid == port->host_deviceid)
 644                                                         continue;
 645                                                 rio_route_add_entry(port, rdev->rswitch,
 646                                                                     RIO_GLOBAL_TABLE,
 647                                                                     destid,
 648                                                                     port_num);
 649                                                 rdev->rswitch->
 650                                                     route_table[destid] =
 651                                                     port_num;
 652                                         }
 653                                 }
 654                         }
 655                 }
 656
 657                 /* Check for empty switch */
 658                 if (next_destid == sw_destid) {
 659                         next_destid++;
 660                         if (next_destid == port->host_deviceid)
 661                                 next_destid++;
 662                 }
 663
 664                 rdev->rswitch->destid = sw_destid;
 665         } else
 666                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 667                     rio_name(rdev), rdev->vid, rdev->did);
 668
 669         return 0;
 670 }
 671
 672 /**
 673  * rio_enum_complete- Tests if enumeration of a network is complete
 674  * @port: Master port to send transaction
 675  *
 676  * Tests the Component Tag CSR for presence of the magic enumeration
 677  * complete flag. Return %1 if enumeration is complete or %0 if
 678  * enumeration is incomplete.
 679  */
 680 static int rio_enum_complete(struct rio_mport *port)
 681 {
 682         u32 tag_csr;
 683         int ret = 0;
 684
 685         rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr);
 686
 687         if (tag_csr == RIO_ENUM_CMPL_MAGIC)
 688                 ret = 1;
 689
 690         return ret;
 691 }
 692
 693 /**
 694  * rio_disc_peer- Recursively discovers a RIO network through a master port
 695  * @net: RIO network being discovered
 696  * @port: Master port to send transactions
 697  * @destid: Current destination ID in network
 698  * @hopcount: Number of hops into the network
 699  *
 700  * Recursively discovers a RIO network.  Transactions are sent via the
 701  * master port passed in @port.
 702  */
 703 static int
 704 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
 705               u8 hopcount)
 706 {
 707         u8 port_num, route_port;
 708         int num_ports;
 709         struct rio_dev *rdev;
 710         u16 ndestid;
 711
 712         /* Setup new RIO device */
 713         if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
 714                 /* Add device to the global and bus/net specific list. */
 715                 list_add_tail(&rdev->net_list, &net->devices);
 716         } else
 717                 return -1;
 718
 719         if (rio_is_switch(rdev)) {
 720                 next_switchid++;
 721
 722                 /* Associated destid is how we accessed this switch */
 723                 rdev->rswitch->destid = destid;
 724
 725                 num_ports = rio_get_swpinfo_tports(port, destid, hopcount);
 726                 pr_debug(
 727                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 728                     rio_name(rdev), rdev->vid, rdev->did, num_ports);
 729                 for (port_num = 0; port_num < num_ports; port_num++) {
 730                         if (rio_get_swpinfo_inport(port, destid, hopcount) ==
 731                             port_num)
 732                                 continue;
 733
 734                         if (rio_sport_is_active
 735                             (port, destid, hopcount, port_num)) {
 736                                 pr_debug(
 737                                     "RIO: scanning device on port %d\n",
 738                                     port_num);
 739                                 for (ndestid = 0; ndestid < RIO_ANY_DESTID;
 740                                      ndestid++) {
 741                                         rio_route_get_entry(port, rdev->rswitch,
 742                                                             RIO_GLOBAL_TABLE,
 743                                                             ndestid,
 744                                                             &route_port);
 745                                         if (route_port == port_num)
 746                                                 break;
 747                                 }
 748
 749                                 if (rio_disc_peer
 750                                     (net, port, ndestid, hopcount + 1) < 0)
 751                                         return -1;
 752                         }
 753                 }
 754         } else
 755                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 756                     rio_name(rdev), rdev->vid, rdev->did);
 757
 758         return 0;
 759 }
 760
 761 /**
 762  * rio_mport_is_active- Tests if master port link is active
 763  * @port: Master port to test
 764  *
 765  * Reads the port error status CSR for the master port to
 766  * determine if the port has an active link.  Returns
 767  * %PORT_N_ERR_STS_PORT_OK if the  master port is active
 768  * or %0 if it is inactive.
 769  */
 770 static int rio_mport_is_active(struct rio_mport *port)
 771 {
 772         u32 result = 0;
 773         u32 ext_ftr_ptr;
 774         int *entry = rio_mport_phys_table;
 775
 776         do {
 777                 if ((ext_ftr_ptr =
 778                      rio_mport_get_feature(port, 1, 0, 0, *entry)))
 779                         break;
 780         } while (*++entry >= 0);
 781
 782         if (ext_ftr_ptr)
 783                 rio_local_read_config_32(port,
 784                                          ext_ftr_ptr +
 785                                          RIO_PORT_N_ERR_STS_CSR(port->index),
 786                                          &result);
 787
 788         return (result & PORT_N_ERR_STS_PORT_OK);
 789 }
 790
 791 /**
 792  * rio_alloc_net- Allocate and configure a new RIO network
 793  * @port: Master port associated with the RIO network
 794  *
 795  * Allocates a RIO network structure, initializes per-network
 796  * list heads, and adds the associated master port to the
 797  * network list of associated master ports. Returns a
 798  * RIO network pointer on success or %NULL on failure.
 799  */
 800 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
 801 {
 802         struct rio_net *net;
 803
 804         net = kmalloc(sizeof(struct rio_net), GFP_KERNEL);
 805         if (net) {
 806                 memset(net, 0, sizeof(struct rio_net));
 807                 INIT_LIST_HEAD(&net->node);
 808                 INIT_LIST_HEAD(&net->devices);
 809                 INIT_LIST_HEAD(&net->mports);
 810                 list_add_tail(&port->nnode, &net->mports);
 811                 net->hport = port;
 812                 net->id = next_net++;
 813         }
 814         return net;
 815 }
 816
 817 /**
 818  * rio_update_route_tables- Updates route tables in switches
 819  * @port: Master port associated with the RIO network
 820  *
 821  * For each enumerated device, ensure that each switch in a system
 822  * has correct routing entries. Add routes for devices that where
 823  * unknown dirung the first enumeration pass through the switch.
 824  */
 825 static void rio_update_route_tables(struct rio_mport *port)
 826 {
 827         struct rio_dev *rdev;
 828         struct rio_switch *rswitch;
 829         u8 sport;
 830         u16 destid;
 831
 832         list_for_each_entry(rdev, &rio_devices, global_list) {
 833
 834                 destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid;
 835
 836                 list_for_each_entry(rswitch, &rio_switches, node) {
 837
 838                         if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
 839                                 continue;
 840
 841                         if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
 842
 843                                 sport = rio_get_swpinfo_inport(port,
 844                                                 rswitch->destid, rswitch->hopcount);
 845
 846                                 if (rswitch->add_entry) {
 847                                         rio_route_add_entry(port, rswitch, RIO_GLOBAL_TABLE, destid, sport);
 848                                         rswitch->route_table[destid] = sport;
 849                                 }
 850                         }
 851                 }
 852         }
 853 }
 854
 855 /**
 856  * rio_enum_mport- Start enumeration through a master port
 857  * @mport: Master port to send transactions
 858  *
 859  * Starts the enumeration process. If somebody has enumerated our
 860  * master port device, then give up. If not and we have an active
 861  * link, then start recursive peer enumeration. Returns %0 if
 862  * enumeration succeeds or %-EBUSY if enumeration fails.
 863  */
 864 int rio_enum_mport(struct rio_mport *mport)
 865 {
 866         struct rio_net *net = NULL;
 867         int rc = 0;
 868
 869         printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
 870                mport->name);
 871         /* If somebody else enumerated our master port device, bail. */
 872         if (rio_enum_host(mport) < 0) {
 873                 printk(KERN_INFO
 874                        "RIO: master port %d device has been enumerated by a remote host\n",
 875                        mport->id);
 876                 rc = -EBUSY;
 877                 goto out;
 878         }
 879
 880         /* If master port has an active link, allocate net and enum peers */
 881         if (rio_mport_is_active(mport)) {
 882                 if (!(net = rio_alloc_net(mport))) {
 883                         printk(KERN_ERR "RIO: failed to allocate new net\n");
 884                         rc = -ENOMEM;
 885                         goto out;
 886                 }
 887                 if (rio_enum_peer(net, mport, 0) < 0) {
 888                         /* A higher priority host won enumeration, bail. */
 889                         printk(KERN_INFO
 890                                "RIO: master port %d device has lost enumeration to a remote host\n",
 891                                mport->id);
 892                         rio_clear_locks(mport);
 893                         rc = -EBUSY;
 894                         goto out;
 895                 }
 896                 rio_update_route_tables(mport);
 897                 rio_clear_locks(mport);
 898         } else {
 899                 printk(KERN_INFO "RIO: master port %d link inactive\n",
 900                        mport->id);
 901                 rc = -EINVAL;
 902         }
 903
 904       out:
 905         return rc;
 906 }
 907
 908 /**
 909  * rio_build_route_tables- Generate route tables from switch route entries
 910  *
 911  * For each switch device, generate a route table by copying existing
 912  * route entries from the switch.
 913  */
 914 static void rio_build_route_tables(void)
 915 {
 916         struct rio_dev *rdev;
 917         int i;
 918         u8 sport;
 919
 920         list_for_each_entry(rdev, &rio_devices, global_list)
 921             if (rio_is_switch(rdev))
 922                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) {
 923                         if (rio_route_get_entry
 924                             (rdev->net->hport, rdev->rswitch, RIO_GLOBAL_TABLE,
 925                              i, &sport) < 0)
 926                                 continue;
 927                         rdev->rswitch->route_table[i] = sport;
 928                 }
 929 }
 930
 931 /**
 932  * rio_enum_timeout- Signal that enumeration timed out
 933  * @data: Address of timeout flag.
 934  *
 935  * When the enumeration complete timer expires, set a flag that
 936  * signals to the discovery process that enumeration did not
 937  * complete in a sane amount of time.
 938  */
 939 static void rio_enum_timeout(unsigned long data)
 940 {
 941         /* Enumeration timed out, set flag */
 942         *(int *)data = 1;
 943 }
 944
 945 /**
 946  * rio_disc_mport- Start discovery through a master port
 947  * @mport: Master port to send transactions
 948  *
 949  * Starts the discovery process. If we have an active link,
 950  * then wait for the signal that enumeration is complete.
 951  * When enumeration completion is signaled, start recursive
 952  * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
 953  * on failure.
 954  */
 955 int rio_disc_mport(struct rio_mport *mport)
 956 {
 957         struct rio_net *net = NULL;
 958         int enum_timeout_flag = 0;
 959
 960         printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
 961                mport->name);
 962
 963         /* If master port has an active link, allocate net and discover peers */
 964         if (rio_mport_is_active(mport)) {
 965                 if (!(net = rio_alloc_net(mport))) {
 966                         printk(KERN_ERR "RIO: Failed to allocate new net\n");
 967                         goto bail;
 968                 }
 969
 970                 pr_debug("RIO: wait for enumeration complete...");
 971
 972                 rio_enum_timer.expires =
 973                     jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
 974                 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
 975                 add_timer(&rio_enum_timer);
 976                 while (!rio_enum_complete(mport)) {
 977                         mdelay(1);
 978                         if (enum_timeout_flag) {
 979                                 del_timer_sync(&rio_enum_timer);
 980                                 goto timeout;
 981                         }
 982                 }
 983                 del_timer_sync(&rio_enum_timer);
 984
 985                 pr_debug("done\n");
 986                 if (rio_disc_peer(net, mport, RIO_ANY_DESTID, 0) < 0) {
 987                         printk(KERN_INFO
 988                                "RIO: master port %d device has failed discovery\n",
 989                                mport->id);
 990                         goto bail;
 991                 }
 992
 993                 rio_build_route_tables();
 994         }
 995
 996         return 0;
 997
 998       timeout:
 999         pr_debug("timeout\n");
1000       bail:
1001         return -EBUSY;
1002 }