drivers/rapidio/rio-scan.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * RapidIO enumeration and discovery support
   4  *
   5  * Copyright 2005 MontaVista Software, Inc.
   6  * Matt Porter <mporter@kernel.crashing.org>
   7  *
   8  * Copyright 2009 Integrated Device Technology, Inc.
   9  * Alex Bounine <alexandre.bounine@idt.com>
  10  * - Added Port-Write/Error Management initialization and handling
  11  *
  12  * Copyright 2009 Sysgo AG
  13  * Thomas Moll <thomas.moll@sysgo.com>
  14  * - Added Input- Output- enable functionality, to allow full communication
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19
  20 #include <linux/delay.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/init.h>
  23 #include <linux/rio.h>
  24 #include <linux/rio_drv.h>
  25 #include <linux/rio_ids.h>
  26 #include <linux/rio_regs.h>
  27 #include <linux/module.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/timer.h>
  30 #include <linux/sched.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/slab.h>
  33
  34 #include "rio.h"
  35
  36 static void rio_init_em(struct rio_dev *rdev);
  37
  38 struct rio_id_table {
  39         u16 start;      /* logical minimal id */
  40         u32 max;        /* max number of IDs in table */
  41         spinlock_t lock;
  42         unsigned long table[];
  43 };
  44
  45 static int next_destid = 0;
  46 static int next_comptag = 1;
  47
  48 /**
  49  * rio_destid_alloc - Allocate next available destID for given network
  50  * @net: RIO network
  51  *
  52  * Returns next available device destination ID for the specified RIO network.
  53  * Marks allocated ID as one in use.
  54  * Returns RIO_INVALID_DESTID if new destID is not available.
  55  */
  56 static u16 rio_destid_alloc(struct rio_net *net)
  57 {
  58         int destid;
  59         struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
  60
  61         spin_lock(&idtab->lock);
  62         destid = find_first_zero_bit(idtab->table, idtab->max);
  63
  64         if (destid < idtab->max) {
  65                 set_bit(destid, idtab->table);
  66                 destid += idtab->start;
  67         } else
  68                 destid = RIO_INVALID_DESTID;
  69
  70         spin_unlock(&idtab->lock);
  71         return (u16)destid;
  72 }
  73
  74 /**
  75  * rio_destid_reserve - Reserve the specified destID
  76  * @net: RIO network
  77  * @destid: destID to reserve
  78  *
  79  * Tries to reserve the specified destID.
  80  * Returns 0 if successful.
  81  */
  82 static int rio_destid_reserve(struct rio_net *net, u16 destid)
  83 {
  84         int oldbit;
  85         struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
  86
  87         destid -= idtab->start;
  88         spin_lock(&idtab->lock);
  89         oldbit = test_and_set_bit(destid, idtab->table);
  90         spin_unlock(&idtab->lock);
  91         return oldbit;
  92 }
  93
  94 /**
  95  * rio_destid_free - free a previously allocated destID
  96  * @net: RIO network
  97  * @destid: destID to free
  98  *
  99  * Makes the specified destID available for use.
 100  */
 101 static void rio_destid_free(struct rio_net *net, u16 destid)
 102 {
 103         struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
 104
 105         destid -= idtab->start;
 106         spin_lock(&idtab->lock);
 107         clear_bit(destid, idtab->table);
 108         spin_unlock(&idtab->lock);
 109 }
 110
 111 /**
 112  * rio_destid_first - return first destID in use
 113  * @net: RIO network
 114  */
 115 static u16 rio_destid_first(struct rio_net *net)
 116 {
 117         int destid;
 118         struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
 119
 120         spin_lock(&idtab->lock);
 121         destid = find_first_bit(idtab->table, idtab->max);
 122         if (destid >= idtab->max)
 123                 destid = RIO_INVALID_DESTID;
 124         else
 125                 destid += idtab->start;
 126         spin_unlock(&idtab->lock);
 127         return (u16)destid;
 128 }
 129
 130 /**
 131  * rio_destid_next - return next destID in use
 132  * @net: RIO network
 133  * @from: destination ID from which search shall continue
 134  */
 135 static u16 rio_destid_next(struct rio_net *net, u16 from)
 136 {
 137         int destid;
 138         struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
 139
 140         spin_lock(&idtab->lock);
 141         destid = find_next_bit(idtab->table, idtab->max, from);
 142         if (destid >= idtab->max)
 143                 destid = RIO_INVALID_DESTID;
 144         else
 145                 destid += idtab->start;
 146         spin_unlock(&idtab->lock);
 147         return (u16)destid;
 148 }
 149
 150 /**
 151  * rio_get_device_id - Get the base/extended device id for a device
 152  * @port: RIO master port
 153  * @destid: Destination ID of device
 154  * @hopcount: Hopcount to device
 155  *
 156  * Reads the base/extended device id from a device. Returns the
 157  * 8/16-bit device ID.
 158  */
 159 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
 160 {
 161         u32 result;
 162
 163         rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
 164
 165         return RIO_GET_DID(port->sys_size, result);
 166 }
 167
 168 /**
 169  * rio_set_device_id - Set the base/extended device id for a device
 170  * @port: RIO master port
 171  * @destid: Destination ID of device
 172  * @hopcount: Hopcount to device
 173  * @did: Device ID value to be written
 174  *
 175  * Writes the base/extended device id from a device.
 176  */
 177 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
 178 {
 179         rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
 180                                   RIO_SET_DID(port->sys_size, did));
 181 }
 182
 183 /**
 184  * rio_clear_locks- Release all host locks and signal enumeration complete
 185  * @net: RIO network to run on
 186  *
 187  * Marks the component tag CSR on each device with the enumeration
 188  * complete flag. When complete, it then release the host locks on
 189  * each device. Returns 0 on success or %-EINVAL on failure.
 190  */
 191 static int rio_clear_locks(struct rio_net *net)
 192 {
 193         struct rio_mport *port = net->hport;
 194         struct rio_dev *rdev;
 195         u32 result;
 196         int ret = 0;
 197
 198         /* Release host device id locks */
 199         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 200                                   port->host_deviceid);
 201         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 202         if ((result & 0xffff) != 0xffff) {
 203                 printk(KERN_INFO
 204                        "RIO: badness when releasing host lock on master port, result %8.8x\n",
 205                        result);
 206                 ret = -EINVAL;
 207         }
 208         list_for_each_entry(rdev, &net->devices, net_list) {
 209                 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
 210                                     port->host_deviceid);
 211                 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
 212                 if ((result & 0xffff) != 0xffff) {
 213                         printk(KERN_INFO
 214                                "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
 215                                rdev->vid, rdev->did);
 216                         ret = -EINVAL;
 217                 }
 218
 219                 /* Mark device as discovered and enable master */
 220                 rio_read_config_32(rdev,
 221                                    rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 222                                    &result);
 223                 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
 224                 rio_write_config_32(rdev,
 225                                     rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 226                                     result);
 227         }
 228
 229         return ret;
 230 }
 231
 232 /**
 233  * rio_enum_host- Set host lock and initialize host destination ID
 234  * @port: Master port to issue transaction
 235  *
 236  * Sets the local host master port lock and destination ID register
 237  * with the host device ID value. The host device ID value is provided
 238  * by the platform. Returns %0 on success or %-1 on failure.
 239  */
 240 static int rio_enum_host(struct rio_mport *port)
 241 {
 242         u32 result;
 243
 244         /* Set master port host device id lock */
 245         rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
 246                                   port->host_deviceid);
 247
 248         rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
 249         if ((result & 0xffff) != port->host_deviceid)
 250                 return -1;
 251
 252         /* Set master port destid and init destid ctr */
 253         rio_local_set_device_id(port, port->host_deviceid);
 254         return 0;
 255 }
 256
 257 /**
 258  * rio_device_has_destid- Test if a device contains a destination ID register
 259  * @port: Master port to issue transaction
 260  * @src_ops: RIO device source operations
 261  * @dst_ops: RIO device destination operations
 262  *
 263  * Checks the provided @src_ops and @dst_ops for the necessary transaction
 264  * capabilities that indicate whether or not a device will implement a
 265  * destination ID register. Returns 1 if true or 0 if false.
 266  */
 267 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
 268                                  int dst_ops)
 269 {
 270         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;
 271
 272         return !!((src_ops | dst_ops) & mask);
 273 }
 274
 275 /**
 276  * rio_release_dev- Frees a RIO device struct
 277  * @dev: LDM device associated with a RIO device struct
 278  *
 279  * Gets the RIO device struct associated a RIO device struct.
 280  * The RIO device struct is freed.
 281  */
 282 static void rio_release_dev(struct device *dev)
 283 {
 284         struct rio_dev *rdev;
 285
 286         rdev = to_rio_dev(dev);
 287         kfree(rdev);
 288 }
 289
 290 /**
 291  * rio_is_switch- Tests if a RIO device has switch capabilities
 292  * @rdev: RIO device
 293  *
 294  * Gets the RIO device Processing Element Features register
 295  * contents and tests for switch capabilities. Returns 1 if
 296  * the device is a switch or 0 if it is not a switch.
 297  * The RIO device struct is freed.
 298  */
 299 static int rio_is_switch(struct rio_dev *rdev)
 300 {
 301         if (rdev->pef & RIO_PEF_SWITCH)
 302                 return 1;
 303         return 0;
 304 }
 305
 306 /**
 307  * rio_setup_device- Allocates and sets up a RIO device
 308  * @net: RIO network
 309  * @port: Master port to send transactions
 310  * @destid: Current destination ID
 311  * @hopcount: Current hopcount
 312  * @do_enum: Enumeration/Discovery mode flag
 313  *
 314  * Allocates a RIO device and configures fields based on configuration
 315  * space contents. If device has a destination ID register, a destination
 316  * ID is either assigned in enumeration mode or read from configuration
 317  * space in discovery mode.  If the device has switch capabilities, then
 318  * a switch is allocated and configured appropriately. Returns a pointer
 319  * to a RIO device on success or NULL on failure.
 320  *
 321  */
 322 static struct rio_dev *rio_setup_device(struct rio_net *net,
 323                                         struct rio_mport *port, u16 destid,
 324                                         u8 hopcount, int do_enum)
 325 {
 326         int ret = 0;
 327         struct rio_dev *rdev;
 328         struct rio_switch *rswitch = NULL;
 329         int result, rdid;
 330         size_t size;
 331         u32 swpinfo = 0;
 332
 333         size = sizeof(*rdev);
 334         if (rio_mport_read_config_32(port, destid, hopcount,
 335                                      RIO_PEF_CAR, &result))
 336                 return NULL;
 337
 338         if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
 339                 rio_mport_read_config_32(port, destid, hopcount,
 340                                          RIO_SWP_INFO_CAR, &swpinfo);
 341                 if (result & RIO_PEF_SWITCH)
 342                         size += struct_size(rswitch, nextdev, RIO_GET_TOTAL_PORTS(swpinfo));
 343         }
 344
 345         rdev = kzalloc(size, GFP_KERNEL);
 346         if (!rdev)
 347                 return NULL;
 348
 349         rdev->net = net;
 350         rdev->pef = result;
 351         rdev->swpinfo = swpinfo;
 352         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
 353                                  &result);
 354         rdev->did = result >> 16;
 355         rdev->vid = result & 0xffff;
 356         rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
 357                                  &rdev->device_rev);
 358         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
 359                                  &result);
 360         rdev->asm_did = result >> 16;
 361         rdev->asm_vid = result & 0xffff;
 362         rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
 363                                  &result);
 364         rdev->asm_rev = result >> 16;
 365         if (rdev->pef & RIO_PEF_EXT_FEATURES) {
 366                 rdev->efptr = result & 0xffff;
 367                 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
 368                                                 hopcount, &rdev->phys_rmap);
 369                 pr_debug("RIO: %s Register Map %d device\n",
 370                          __func__, rdev->phys_rmap);
 371
 372                 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
 373                                                 hopcount, RIO_EFB_ERR_MGMNT);
 374                 if (!rdev->em_efptr)
 375                         rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
 376                                                 hopcount, RIO_EFB_ERR_MGMNT_HS);
 377         }
 378
 379         rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
 380                                  &rdev->src_ops);
 381         rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
 382                                  &rdev->dst_ops);
 383
 384         if (do_enum) {
 385                 /* Assign component tag to device */
 386                 if (next_comptag >= 0x10000) {
 387                         pr_err("RIO: Component Tag Counter Overflow\n");
 388                         goto cleanup;
 389                 }
 390                 rio_mport_write_config_32(port, destid, hopcount,
 391                                           RIO_COMPONENT_TAG_CSR, next_comptag);
 392                 rdev->comp_tag = next_comptag++;
 393                 rdev->do_enum = true;
 394         }  else {
 395                 rio_mport_read_config_32(port, destid, hopcount,
 396                                          RIO_COMPONENT_TAG_CSR,
 397                                          &rdev->comp_tag);
 398         }
 399
 400         if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
 401                 if (do_enum) {
 402                         rio_set_device_id(port, destid, hopcount, next_destid);
 403                         rdev->destid = next_destid;
 404                         next_destid = rio_destid_alloc(net);
 405                 } else
 406                         rdev->destid = rio_get_device_id(port, destid, hopcount);
 407
 408                 rdev->hopcount = 0xff;
 409         } else {
 410                 /* Switch device has an associated destID which
 411                  * will be adjusted later
 412                  */
 413                 rdev->destid = destid;
 414                 rdev->hopcount = hopcount;
 415         }
 416
 417         /* If a PE has both switch and other functions, show it as a switch */
 418         if (rio_is_switch(rdev)) {
 419                 rswitch = rdev->rswitch;
 420                 rswitch->port_ok = 0;
 421                 spin_lock_init(&rswitch->lock);
 422                 rswitch->route_table =
 423                         kzalloc(RIO_MAX_ROUTE_ENTRIES(port->sys_size),
 424                                 GFP_KERNEL);
 425                 if (!rswitch->route_table)
 426                         goto cleanup;
 427                 /* Initialize switch route table */
 428                 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
 429                                 rdid++)
 430                         rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
 431                 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
 432                              rdev->comp_tag & RIO_CTAG_UDEVID);
 433
 434                 if (do_enum)
 435                         rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
 436         } else {
 437                 if (do_enum)
 438                         /*Enable Input Output Port (transmitter receiver)*/
 439                         rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
 440
 441                 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
 442                              rdev->comp_tag & RIO_CTAG_UDEVID);
 443         }
 444
 445         rdev->dev.parent = &net->dev;
 446         rio_attach_device(rdev);
 447         rdev->dev.release = rio_release_dev;
 448         rdev->dma_mask = DMA_BIT_MASK(32);
 449         rdev->dev.dma_mask = &rdev->dma_mask;
 450         rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 451
 452         if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
 453                 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
 454                                    0, 0xffff);
 455
 456         ret = rio_add_device(rdev);
 457         if (ret)
 458                 goto cleanup;
 459
 460         rio_dev_get(rdev);
 461
 462         return rdev;
 463
 464 cleanup:
 465         if (rswitch)
 466                 kfree(rswitch->route_table);
 467
 468         kfree(rdev);
 469         return NULL;
 470 }
 471
 472 /**
 473  * rio_sport_is_active- Tests if a switch port has an active connection.
 474  * @rdev: RapidIO device object
 475  * @sp: Switch port number
 476  *
 477  * Reads the port error status CSR for a particular switch port to
 478  * determine if the port has an active link.  Returns
 479  * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
 480  * inactive.
 481  */
 482 static int
 483 rio_sport_is_active(struct rio_dev *rdev, int sp)
 484 {
 485         u32 result = 0;
 486
 487         rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, sp),
 488                            &result);
 489
 490         return result & RIO_PORT_N_ERR_STS_PORT_OK;
 491 }
 492
 493 /**
 494  * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
 495  * @port: Master port to send transaction
 496  * @hopcount: Number of hops to the device
 497  *
 498  * Used during enumeration to read the Host Device ID Lock CSR on a
 499  * RIO device. Returns the value of the lock register.
 500  */
 501 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
 502 {
 503         u32 result;
 504
 505         rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
 506                                  RIO_HOST_DID_LOCK_CSR, &result);
 507
 508         return (u16) (result & 0xffff);
 509 }
 510
 511 /**
 512  * rio_enum_peer- Recursively enumerate a RIO network through a master port
 513  * @net: RIO network being enumerated
 514  * @port: Master port to send transactions
 515  * @hopcount: Number of hops into the network
 516  * @prev: Previous RIO device connected to the enumerated one
 517  * @prev_port: Port on previous RIO device
 518  *
 519  * Recursively enumerates a RIO network.  Transactions are sent via the
 520  * master port passed in @port.
 521  */
 522 static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 523                          u8 hopcount, struct rio_dev *prev, int prev_port)
 524 {
 525         struct rio_dev *rdev;
 526         u32 regval;
 527         int tmp;
 528
 529         if (rio_mport_chk_dev_access(port,
 530                         RIO_ANY_DESTID(port->sys_size), hopcount)) {
 531                 pr_debug("RIO: device access check failed\n");
 532                 return -1;
 533         }
 534
 535         if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 536                 pr_debug("RIO: PE already discovered by this host\n");
 537                 /*
 538                  * Already discovered by this host. Add it as another
 539                  * link to the existing device.
 540                  */
 541                 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
 542                                 hopcount, RIO_COMPONENT_TAG_CSR, &regval);
 543
 544                 if (regval) {
 545                         rdev = rio_get_comptag((regval & 0xffff), NULL);
 546
 547                         if (rdev && prev && rio_is_switch(prev)) {
 548                                 pr_debug("RIO: redundant path to %s\n",
 549                                          rio_name(rdev));
 550                                 prev->rswitch->nextdev[prev_port] = rdev;
 551                         }
 552                 }
 553
 554                 return 0;
 555         }
 556
 557         /* Attempt to acquire device lock */
 558         rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 559                                   hopcount,
 560                                   RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
 561         while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
 562                < port->host_deviceid) {
 563                 /* Delay a bit */
 564                 mdelay(1);
 565                 /* Attempt to acquire device lock again */
 566                 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
 567                                           hopcount,
 568                                           RIO_HOST_DID_LOCK_CSR,
 569                                           port->host_deviceid);
 570         }
 571
 572         if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
 573                 pr_debug(
 574                     "RIO: PE locked by a higher priority host...retreating\n");
 575                 return -1;
 576         }
 577
 578         /* Setup new RIO device */
 579         rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
 580                                         hopcount, 1);
 581         if (rdev) {
 582                 rdev->prev = prev;
 583                 if (prev && rio_is_switch(prev))
 584                         prev->rswitch->nextdev[prev_port] = rdev;
 585         } else
 586                 return -1;
 587
 588         if (rio_is_switch(rdev)) {
 589                 int sw_destid;
 590                 int cur_destid;
 591                 int sw_inport;
 592                 u16 destid;
 593                 int port_num;
 594
 595                 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
 596                 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 597                                     port->host_deviceid, sw_inport, 0);
 598                 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
 599
 600                 destid = rio_destid_first(net);
 601                 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
 602                         if (destid != port->host_deviceid) {
 603                                 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 604                                                     destid, sw_inport, 0);
 605                                 rdev->rswitch->route_table[destid] = sw_inport;
 606                         }
 607                         destid = rio_destid_next(net, destid + 1);
 608                 }
 609                 pr_debug(
 610                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 611                     rio_name(rdev), rdev->vid, rdev->did,
 612                     RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 613                 sw_destid = next_destid;
 614                 for (port_num = 0;
 615                      port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 616                      port_num++) {
 617                         if (sw_inport == port_num) {
 618                                 rio_enable_rx_tx_port(port, 0,
 619                                               RIO_ANY_DESTID(port->sys_size),
 620                                               hopcount, port_num);
 621                                 rdev->rswitch->port_ok |= (1 << port_num);
 622                                 continue;
 623                         }
 624
 625                         cur_destid = next_destid;
 626
 627                         if (rio_sport_is_active(rdev, port_num)) {
 628                                 pr_debug(
 629                                     "RIO: scanning device on port %d\n",
 630                                     port_num);
 631                                 rio_enable_rx_tx_port(port, 0,
 632                                               RIO_ANY_DESTID(port->sys_size),
 633                                               hopcount, port_num);
 634                                 rdev->rswitch->port_ok |= (1 << port_num);
 635                                 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
 636                                                 RIO_ANY_DESTID(port->sys_size),
 637                                                 port_num, 0);
 638
 639                                 if (rio_enum_peer(net, port, hopcount + 1,
 640                                                   rdev, port_num) < 0)
 641                                         return -1;
 642
 643                                 /* Update routing tables */
 644                                 destid = rio_destid_next(net, cur_destid + 1);
 645                                 if (destid != RIO_INVALID_DESTID) {
 646                                         for (destid = cur_destid;
 647                                              destid < next_destid;) {
 648                                                 if (destid != port->host_deviceid) {
 649                                                         rio_route_add_entry(rdev,
 650                                                                     RIO_GLOBAL_TABLE,
 651                                                                     destid,
 652                                                                     port_num,
 653                                                                     0);
 654                                                         rdev->rswitch->
 655                                                                 route_table[destid] =
 656                                                                 port_num;
 657                                                 }
 658                                                 destid = rio_destid_next(net,
 659                                                                 destid + 1);
 660                                         }
 661                                 }
 662                         } else {
 663                                 /* If switch supports Error Management,
 664                                  * set PORT_LOCKOUT bit for unused port
 665                                  */
 666                                 if (rdev->em_efptr)
 667                                         rio_set_port_lockout(rdev, port_num, 1);
 668
 669                                 rdev->rswitch->port_ok &= ~(1 << port_num);
 670                         }
 671                 }
 672
 673                 /* Direct Port-write messages to the enumeratiing host */
 674                 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
 675                     (rdev->em_efptr)) {
 676                         rio_write_config_32(rdev,
 677                                         rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
 678                                         (port->host_deviceid << 16) |
 679                                         (port->sys_size << 15));
 680                 }
 681
 682                 rio_init_em(rdev);
 683
 684                 /* Check for empty switch */
 685                 if (next_destid == sw_destid)
 686                         next_destid = rio_destid_alloc(net);
 687
 688                 rdev->destid = sw_destid;
 689         } else
 690                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 691                     rio_name(rdev), rdev->vid, rdev->did);
 692
 693         return 0;
 694 }
 695
 696 /**
 697  * rio_enum_complete- Tests if enumeration of a network is complete
 698  * @port: Master port to send transaction
 699  *
 700  * Tests the PGCCSR discovered bit for non-zero value (enumeration
 701  * complete flag). Return %1 if enumeration is complete or %0 if
 702  * enumeration is incomplete.
 703  */
 704 static int rio_enum_complete(struct rio_mport *port)
 705 {
 706         u32 regval;
 707
 708         rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
 709                                  &regval);
 710         return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
 711 }
 712
 713 /**
 714  * rio_disc_peer- Recursively discovers a RIO network through a master port
 715  * @net: RIO network being discovered
 716  * @port: Master port to send transactions
 717  * @destid: Current destination ID in network
 718  * @hopcount: Number of hops into the network
 719  * @prev: previous rio_dev
 720  * @prev_port: previous port number
 721  *
 722  * Recursively discovers a RIO network.  Transactions are sent via the
 723  * master port passed in @port.
 724  */
 725 static int
 726 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
 727               u8 hopcount, struct rio_dev *prev, int prev_port)
 728 {
 729         u8 port_num, route_port;
 730         struct rio_dev *rdev;
 731         u16 ndestid;
 732
 733         /* Setup new RIO device */
 734         if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
 735                 rdev->prev = prev;
 736                 if (prev && rio_is_switch(prev))
 737                         prev->rswitch->nextdev[prev_port] = rdev;
 738         } else
 739                 return -1;
 740
 741         if (rio_is_switch(rdev)) {
 742                 /* Associated destid is how we accessed this switch */
 743                 rdev->destid = destid;
 744
 745                 pr_debug(
 746                     "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
 747                     rio_name(rdev), rdev->vid, rdev->did,
 748                     RIO_GET_TOTAL_PORTS(rdev->swpinfo));
 749                 for (port_num = 0;
 750                      port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
 751                      port_num++) {
 752                         if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
 753                                 continue;
 754
 755                         if (rio_sport_is_active(rdev, port_num)) {
 756                                 pr_debug(
 757                                     "RIO: scanning device on port %d\n",
 758                                     port_num);
 759
 760                                 rio_lock_device(port, destid, hopcount, 1000);
 761
 762                                 for (ndestid = 0;
 763                                      ndestid < RIO_ANY_DESTID(port->sys_size);
 764                                      ndestid++) {
 765                                         rio_route_get_entry(rdev,
 766                                                             RIO_GLOBAL_TABLE,
 767                                                             ndestid,
 768                                                             &route_port, 0);
 769                                         if (route_port == port_num)
 770                                                 break;
 771                                 }
 772
 773                                 if (ndestid == RIO_ANY_DESTID(port->sys_size))
 774                                         continue;
 775                                 rio_unlock_device(port, destid, hopcount);
 776                                 if (rio_disc_peer(net, port, ndestid,
 777                                         hopcount + 1, rdev, port_num) < 0)
 778                                         return -1;
 779                         }
 780                 }
 781         } else
 782                 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
 783                     rio_name(rdev), rdev->vid, rdev->did);
 784
 785         return 0;
 786 }
 787
 788 /**
 789  * rio_mport_is_active- Tests if master port link is active
 790  * @port: Master port to test
 791  *
 792  * Reads the port error status CSR for the master port to
 793  * determine if the port has an active link.  Returns
 794  * %RIO_PORT_N_ERR_STS_PORT_OK if the  master port is active
 795  * or %0 if it is inactive.
 796  */
 797 static int rio_mport_is_active(struct rio_mport *port)
 798 {
 799         u32 result = 0;
 800
 801         rio_local_read_config_32(port,
 802                 port->phys_efptr +
 803                         RIO_PORT_N_ERR_STS_CSR(port->index, port->phys_rmap),
 804                 &result);
 805         return result & RIO_PORT_N_ERR_STS_PORT_OK;
 806 }
 807
 808 static void rio_scan_release_net(struct rio_net *net)
 809 {
 810         pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
 811         kfree(net->enum_data);
 812 }
 813
 814 static void rio_scan_release_dev(struct device *dev)
 815 {
 816         struct rio_net *net;
 817
 818         net = to_rio_net(dev);
 819         pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
 820         kfree(net);
 821 }
 822
 823 /*
 824  * rio_scan_alloc_net - Allocate and configure a new RIO network
 825  * @mport: Master port associated with the RIO network
 826  * @do_enum: Enumeration/Discovery mode flag
 827  * @start: logical minimal start id for new net
 828  *
 829  * Allocates a new RIO network structure and initializes enumerator-specific
 830  * part of it (if required).
 831  * Returns a RIO network pointer on success or %NULL on failure.
 832  */
 833 static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
 834                                           int do_enum, u16 start)
 835 {
 836         struct rio_net *net;
 837
 838         net = rio_alloc_net(mport);
 839
 840         if (net && do_enum) {
 841                 struct rio_id_table *idtab;
 842                 size_t size;
 843
 844                 size = sizeof(struct rio_id_table) +
 845                                 BITS_TO_LONGS(
 846                                         RIO_MAX_ROUTE_ENTRIES(mport->sys_size)
 847                                         ) * sizeof(long);
 848
 849                 idtab = kzalloc(size, GFP_KERNEL);
 850
 851                 if (idtab == NULL) {
 852                         pr_err("RIO: failed to allocate destID table\n");
 853                         rio_free_net(net);
 854                         net = NULL;
 855                 } else {
 856                         net->enum_data = idtab;
 857                         net->release = rio_scan_release_net;
 858                         idtab->start = start;
 859                         idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
 860                         spin_lock_init(&idtab->lock);
 861                 }
 862         }
 863
 864         if (net) {
 865                 net->id = mport->id;
 866                 net->hport = mport;
 867                 dev_set_name(&net->dev, "rnet_%d", net->id);
 868                 net->dev.parent = &mport->dev;
 869                 net->dev.release = rio_scan_release_dev;
 870                 rio_add_net(net);
 871         }
 872
 873         return net;
 874 }
 875
 876 /**
 877  * rio_update_route_tables- Updates route tables in switches
 878  * @net: RIO network to run update on
 879  *
 880  * For each enumerated device, ensure that each switch in a system
 881  * has correct routing entries. Add routes for devices that where
 882  * unknown during the first enumeration pass through the switch.
 883  */
 884 static void rio_update_route_tables(struct rio_net *net)
 885 {
 886         struct rio_dev *rdev, *swrdev;
 887         struct rio_switch *rswitch;
 888         u8 sport;
 889         u16 destid;
 890
 891         list_for_each_entry(rdev, &net->devices, net_list) {
 892
 893                 destid = rdev->destid;
 894
 895                 list_for_each_entry(rswitch, &net->switches, node) {
 896
 897                         if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
 898                                 continue;
 899
 900                         if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
 901                                 swrdev = sw_to_rio_dev(rswitch);
 902
 903                                 /* Skip if destid ends in empty switch*/
 904                                 if (swrdev->destid == destid)
 905                                         continue;
 906
 907                                 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
 908
 909                                 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
 910                                                     destid, sport, 0);
 911                                 rswitch->route_table[destid] = sport;
 912                         }
 913                 }
 914         }
 915 }
 916
 917 /**
 918  * rio_init_em - Initializes RIO Error Management (for switches)
 919  * @rdev: RIO device
 920  *
 921  * For each enumerated switch, call device-specific error management
 922  * initialization routine (if supplied by the switch driver).
 923  */
 924 static void rio_init_em(struct rio_dev *rdev)
 925 {
 926         if (rio_is_switch(rdev) && (rdev->em_efptr) &&
 927             rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
 928                 rdev->rswitch->ops->em_init(rdev);
 929         }
 930 }
 931
 932 /**
 933  * rio_enum_mport- Start enumeration through a master port
 934  * @mport: Master port to send transactions
 935  * @flags: Enumeration control flags
 936  *
 937  * Starts the enumeration process. If somebody has enumerated our
 938  * master port device, then give up. If not and we have an active
 939  * link, then start recursive peer enumeration. Returns %0 if
 940  * enumeration succeeds or %-EBUSY if enumeration fails.
 941  */
 942 static int rio_enum_mport(struct rio_mport *mport, u32 flags)
 943 {
 944         struct rio_net *net = NULL;
 945         int rc = 0;
 946
 947         printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
 948                mport->name);
 949
 950         /*
 951          * To avoid multiple start requests (repeat enumeration is not supported
 952          * by this method) check if enumeration/discovery was performed for this
 953          * mport: if mport was added into the list of mports for a net exit
 954          * with error.
 955          */
 956         if (mport->nnode.next || mport->nnode.prev)
 957                 return -EBUSY;
 958
 959         /* If somebody else enumerated our master port device, bail. */
 960         if (rio_enum_host(mport) < 0) {
 961                 printk(KERN_INFO
 962                        "RIO: master port %d device has been enumerated by a remote host\n",
 963                        mport->id);
 964                 rc = -EBUSY;
 965                 goto out;
 966         }
 967
 968         /* If master port has an active link, allocate net and enum peers */
 969         if (rio_mport_is_active(mport)) {
 970                 net = rio_scan_alloc_net(mport, 1, 0);
 971                 if (!net) {
 972                         printk(KERN_ERR "RIO: failed to allocate new net\n");
 973                         rc = -ENOMEM;
 974                         goto out;
 975                 }
 976
 977                 /* reserve mport destID in new net */
 978                 rio_destid_reserve(net, mport->host_deviceid);
 979
 980                 /* Enable Input Output Port (transmitter receiver) */
 981                 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
 982
 983                 /* Set component tag for host */
 984                 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
 985                                           next_comptag++);
 986
 987                 next_destid = rio_destid_alloc(net);
 988
 989                 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
 990                         /* A higher priority host won enumeration, bail. */
 991                         printk(KERN_INFO
 992                                "RIO: master port %d device has lost enumeration to a remote host\n",
 993                                mport->id);
 994                         rio_clear_locks(net);
 995                         rc = -EBUSY;
 996                         goto out;
 997                 }
 998                 /* free the last allocated destID (unused) */
 999                 rio_destid_free(net, next_destid);
1000                 rio_update_route_tables(net);
1001                 rio_clear_locks(net);
1002                 rio_pw_enable(mport, 1);
1003         } else {
1004                 printk(KERN_INFO "RIO: master port %d link inactive\n",
1005                        mport->id);
1006                 rc = -EINVAL;
1007         }
1008
1009       out:
1010         return rc;
1011 }
1012
1013 /**
1014  * rio_build_route_tables- Generate route tables from switch route entries
1015  * @net: RIO network to run route tables scan on
1016  *
1017  * For each switch device, generate a route table by copying existing
1018  * route entries from the switch.
1019  */
1020 static void rio_build_route_tables(struct rio_net *net)
1021 {
1022         struct rio_switch *rswitch;
1023         struct rio_dev *rdev;
1024         int i;
1025         u8 sport;
1026
1027         list_for_each_entry(rswitch, &net->switches, node) {
1028                 rdev = sw_to_rio_dev(rswitch);
1029
1030                 rio_lock_device(net->hport, rdev->destid,
1031                                 rdev->hopcount, 1000);
1032                 for (i = 0;
1033                      i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1034                      i++) {
1035                         if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1036                                                 i, &sport, 0) < 0)
1037                                 continue;
1038                         rswitch->route_table[i] = sport;
1039                 }
1040
1041                 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1042         }
1043 }
1044
1045 /**
1046  * rio_disc_mport- Start discovery through a master port
1047  * @mport: Master port to send transactions
1048  * @flags: discovery control flags
1049  *
1050  * Starts the discovery process. If we have an active link,
1051  * then wait for the signal that enumeration is complete (if wait
1052  * is allowed).
1053  * When enumeration completion is signaled, start recursive
1054  * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1055  * on failure.
1056  */
1057 static int rio_disc_mport(struct rio_mport *mport, u32 flags)
1058 {
1059         struct rio_net *net = NULL;
1060         unsigned long to_end;
1061
1062         printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1063                mport->name);
1064
1065         /* If master port has an active link, allocate net and discover peers */
1066         if (rio_mport_is_active(mport)) {
1067                 if (rio_enum_complete(mport))
1068                         goto enum_done;
1069                 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1070                         return -EAGAIN;
1071
1072                 pr_debug("RIO: wait for enumeration to complete...\n");
1073
1074                 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1075                 while (time_before(jiffies, to_end)) {
1076                         if (rio_enum_complete(mport))
1077                                 goto enum_done;
1078                         msleep(10);
1079                 }
1080
1081                 pr_debug("RIO: discovery timeout on mport %d %s\n",
1082                          mport->id, mport->name);
1083                 goto bail;
1084 enum_done:
1085                 pr_debug("RIO: ... enumeration done\n");
1086
1087                 net = rio_scan_alloc_net(mport, 0, 0);
1088                 if (!net) {
1089                         printk(KERN_ERR "RIO: Failed to allocate new net\n");
1090                         goto bail;
1091                 }
1092
1093                 /* Read DestID assigned by enumerator */
1094                 rio_local_read_config_32(mport, RIO_DID_CSR,
1095                                          &mport->host_deviceid);
1096                 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1097                                                    mport->host_deviceid);
1098
1099                 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1100                                         0, NULL, 0) < 0) {
1101                         printk(KERN_INFO
1102                                "RIO: master port %d device has failed discovery\n",
1103                                mport->id);
1104                         goto bail;
1105                 }
1106
1107                 rio_build_route_tables(net);
1108         }
1109
1110         return 0;
1111 bail:
1112         return -EBUSY;
1113 }
1114
1115 static struct rio_scan rio_scan_ops = {
1116         .owner = THIS_MODULE,
1117         .enumerate = rio_enum_mport,
1118         .discover = rio_disc_mport,
1119 };
1120
1121 static bool scan;
1122 module_param(scan, bool, 0);
1123 MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1124                         "(default = 0)");
1125
1126 /**
1127  * rio_basic_attach:
1128  *
1129  * When this enumeration/discovery method is loaded as a module this function
1130  * registers its specific enumeration and discover routines for all available
1131  * RapidIO mport devices. The "scan" command line parameter controls ability of
1132  * the module to start RapidIO enumeration/discovery automatically.
1133  *
1134  * Returns 0 for success or -EIO if unable to register itself.
1135  *
1136  * This enumeration/discovery method cannot be unloaded and therefore does not
1137  * provide a matching cleanup_module routine.
1138  */
1139
1140 static int __init rio_basic_attach(void)
1141 {
1142         if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1143                 return -EIO;
1144         if (scan)
1145                 rio_init_mports();
1146         return 0;
1147 }
1148
1149 late_initcall(rio_basic_attach);
1150
1151 MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1152 MODULE_LICENSE("GPL");