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 = kzalloc(sizeof(struct rio_dev), GFP_KERNEL); 301 if (!rdev) 302 goto out; 303 304 rdev->net = net; 305 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR, 306 &result); 307 rdev->did = result >> 16; 308 rdev->vid = result & 0xffff; 309 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR, 310 &rdev->device_rev); 311 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR, 312 &result); 313 rdev->asm_did = result >> 16; 314 rdev->asm_vid = result & 0xffff; 315 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR, 316 &result); 317 rdev->asm_rev = result >> 16; 318 rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR, 319 &rdev->pef); 320 if (rdev->pef & RIO_PEF_EXT_FEATURES) 321 rdev->efptr = result & 0xffff; 322 323 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR, 324 &rdev->src_ops); 325 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR, 326 &rdev->dst_ops); 327 328 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { 329 if (do_enum) { 330 rio_set_device_id(port, destid, hopcount, next_destid); 331 rdev->destid = next_destid++; 332 if (next_destid == port->host_deviceid) 333 next_destid++; 334 } else 335 rdev->destid = rio_get_device_id(port, destid, hopcount); 336 } else 337 /* Switch device has an associated destID */ 338 rdev->destid = RIO_INVALID_DESTID; 339 340 /* If a PE has both switch and other functions, show it as a switch */ 341 if (rio_is_switch(rdev)) { 342 rio_mport_read_config_32(port, destid, hopcount, 343 RIO_SWP_INFO_CAR, &rdev->swpinfo); 344 rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL); 345 if (!rswitch) { 346 kfree(rdev); 347 rdev = NULL; 348 goto out; 349 } 350 rswitch->switchid = next_switchid; 351 rswitch->hopcount = hopcount; 352 rswitch->destid = destid; 353 /* Initialize switch route table */ 354 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES; rdid++) 355 rswitch->route_table[rdid] = RIO_INVALID_ROUTE; 356 rdev->rswitch = rswitch; 357 sprintf(rio_name(rdev), "%02x:s:%04x", rdev->net->id, 358 rdev->rswitch->switchid); 359 rio_route_set_ops(rdev); 360 361 list_add_tail(&rswitch->node, &rio_switches); 362 363 } else 364 sprintf(rio_name(rdev), "%02x:e:%04x", rdev->net->id, 365 rdev->destid); 366 367 rdev->dev.bus = &rio_bus_type; 368 369 device_initialize(&rdev->dev); 370 rdev->dev.release = rio_release_dev; 371 rio_dev_get(rdev); 372 373 rdev->dma_mask = DMA_32BIT_MASK; 374 rdev->dev.dma_mask = &rdev->dma_mask; 375 rdev->dev.coherent_dma_mask = DMA_32BIT_MASK; 376 377 if ((rdev->pef & RIO_PEF_INB_DOORBELL) && 378 (rdev->dst_ops & RIO_DST_OPS_DOORBELL)) 379 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], 380 0, 0xffff); 381 382 rio_add_device(rdev); 383 384 out: 385 return rdev; 386 } 387 388 /** 389 * rio_sport_is_active- Tests if a switch port has an active connection. 390 * @port: Master port to send transaction 391 * @destid: Associated destination ID for switch 392 * @hopcount: Hopcount to reach switch 393 * @sport: Switch port number 394 * 395 * Reads the port error status CSR for a particular switch port to 396 * determine if the port has an active link. Returns 397 * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is 398 * inactive. 399 */ 400 static int 401 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport) 402 { 403 u32 result; 404 u32 ext_ftr_ptr; 405 406 int *entry = rio_sport_phys_table; 407 408 do { 409 if ((ext_ftr_ptr = 410 rio_mport_get_feature(port, 0, destid, hopcount, *entry))) 411 412 break; 413 } while (*++entry >= 0); 414 415 if (ext_ftr_ptr) 416 rio_mport_read_config_32(port, destid, hopcount, 417 ext_ftr_ptr + 418 RIO_PORT_N_ERR_STS_CSR(sport), 419 &result); 420 421 return (result & PORT_N_ERR_STS_PORT_OK); 422 } 423 424 /** 425 * rio_route_add_entry- Add a route entry to a switch routing table 426 * @mport: Master port to send transaction 427 * @rswitch: Switch device 428 * @table: Routing table ID 429 * @route_destid: Destination ID to be routed 430 * @route_port: Port number to be routed 431 * 432 * Calls the switch specific add_entry() method to add a route entry 433 * on a switch. The route table can be specified using the @table 434 * argument if a switch has per port routing tables or the normal 435 * use is to specific all tables (or the global table) by passing 436 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL 437 * on failure. 438 */ 439 static int rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch, 440 u16 table, u16 route_destid, u8 route_port) 441 { 442 return rswitch->add_entry(mport, rswitch->destid, 443 rswitch->hopcount, table, 444 route_destid, route_port); 445 } 446 447 /** 448 * rio_route_get_entry- Read a route entry in a switch routing table 449 * @mport: Master port to send transaction 450 * @rswitch: Switch device 451 * @table: Routing table ID 452 * @route_destid: Destination ID to be routed 453 * @route_port: Pointer to read port number into 454 * 455 * Calls the switch specific get_entry() method to read a route entry 456 * in a switch. The route table can be specified using the @table 457 * argument if a switch has per port routing tables or the normal 458 * use is to specific all tables (or the global table) by passing 459 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL 460 * on failure. 461 */ 462 static int 463 rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table, 464 u16 route_destid, u8 * route_port) 465 { 466 return rswitch->get_entry(mport, rswitch->destid, 467 rswitch->hopcount, table, 468 route_destid, route_port); 469 } 470 471 /** 472 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device 473 * @port: Master port to send transaction 474 * @hopcount: Number of hops to the device 475 * 476 * Used during enumeration to read the Host Device ID Lock CSR on a 477 * RIO device. Returns the value of the lock register. 478 */ 479 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) 480 { 481 u32 result; 482 483 rio_mport_read_config_32(port, RIO_ANY_DESTID, hopcount, 484 RIO_HOST_DID_LOCK_CSR, &result); 485 486 return (u16) (result & 0xffff); 487 } 488 489 /** 490 * rio_get_swpinfo_inport- Gets the ingress port number 491 * @mport: Master port to send transaction 492 * @destid: Destination ID associated with the switch 493 * @hopcount: Number of hops to the device 494 * 495 * Returns port number being used to access the switch device. 496 */ 497 static u8 498 rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount) 499 { 500 u32 result; 501 502 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, 503 &result); 504 505 return (u8) (result & 0xff); 506 } 507 508 /** 509 * rio_get_swpinfo_tports- Gets total number of ports on the switch 510 * @mport: Master port to send transaction 511 * @destid: Destination ID associated with the switch 512 * @hopcount: Number of hops to the device 513 * 514 * Returns total numbers of ports implemented by the switch device. 515 */ 516 static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid, 517 u8 hopcount) 518 { 519 u32 result; 520 521 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, 522 &result); 523 524 return RIO_GET_TOTAL_PORTS(result); 525 } 526 527 /** 528 * rio_net_add_mport- Add a master port to a RIO network 529 * @net: RIO network 530 * @port: Master port to add 531 * 532 * Adds a master port to the network list of associated master 533 * ports.. 534 */ 535 static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port) 536 { 537 spin_lock(&rio_global_list_lock); 538 list_add_tail(&port->nnode, &net->mports); 539 spin_unlock(&rio_global_list_lock); 540 } 541 542 /** 543 * rio_enum_peer- Recursively enumerate a RIO network through a master port 544 * @net: RIO network being enumerated 545 * @port: Master port to send transactions 546 * @hopcount: Number of hops into the network 547 * 548 * Recursively enumerates a RIO network. Transactions are sent via the 549 * master port passed in @port. 550 */ 551 static int rio_enum_peer(struct rio_net *net, struct rio_mport *port, 552 u8 hopcount) 553 { 554 int port_num; 555 int num_ports; 556 int cur_destid; 557 int sw_destid; 558 int sw_inport; 559 struct rio_dev *rdev; 560 u16 destid; 561 int tmp; 562 563 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { 564 pr_debug("RIO: PE already discovered by this host\n"); 565 /* 566 * Already discovered by this host. Add it as another 567 * master port for the current network. 568 */ 569 rio_net_add_mport(net, port); 570 return 0; 571 } 572 573 /* Attempt to acquire device lock */ 574 rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount, 575 RIO_HOST_DID_LOCK_CSR, port->host_deviceid); 576 while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) 577 < port->host_deviceid) { 578 /* Delay a bit */ 579 mdelay(1); 580 /* Attempt to acquire device lock again */ 581 rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount, 582 RIO_HOST_DID_LOCK_CSR, 583 port->host_deviceid); 584 } 585 586 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { 587 pr_debug( 588 "RIO: PE locked by a higher priority host...retreating\n"); 589 return -1; 590 } 591 592 /* Setup new RIO device */ 593 if ((rdev = rio_setup_device(net, port, RIO_ANY_DESTID, hopcount, 1))) { 594 /* Add device to the global and bus/net specific list. */ 595 list_add_tail(&rdev->net_list, &net->devices); 596 } else 597 return -1; 598 599 if (rio_is_switch(rdev)) { 600 next_switchid++; 601 sw_inport = rio_get_swpinfo_inport(port, RIO_ANY_DESTID, hopcount); 602 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE, 603 port->host_deviceid, sw_inport); 604 rdev->rswitch->route_table[port->host_deviceid] = sw_inport; 605 606 for (destid = 0; destid < next_destid; destid++) { 607 if (destid == port->host_deviceid) 608 continue; 609 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE, 610 destid, sw_inport); 611 rdev->rswitch->route_table[destid] = sw_inport; 612 } 613 614 num_ports = 615 rio_get_swpinfo_tports(port, RIO_ANY_DESTID, hopcount); 616 pr_debug( 617 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", 618 rio_name(rdev), rdev->vid, rdev->did, num_ports); 619 sw_destid = next_destid; 620 for (port_num = 0; port_num < num_ports; port_num++) { 621 if (sw_inport == port_num) 622 continue; 623 624 cur_destid = next_destid; 625 626 if (rio_sport_is_active 627 (port, RIO_ANY_DESTID, hopcount, port_num)) { 628 pr_debug( 629 "RIO: scanning device on port %d\n", 630 port_num); 631 rio_route_add_entry(port, rdev->rswitch, 632 RIO_GLOBAL_TABLE, 633 RIO_ANY_DESTID, port_num); 634 635 if (rio_enum_peer(net, port, hopcount + 1) < 0) 636 return -1; 637 638 /* Update routing tables */ 639 if (next_destid > cur_destid) { 640 for (destid = cur_destid; 641 destid < next_destid; destid++) { 642 if (destid == port->host_deviceid) 643 continue; 644 rio_route_add_entry(port, rdev->rswitch, 645 RIO_GLOBAL_TABLE, 646 destid, 647 port_num); 648 rdev->rswitch-> 649 route_table[destid] = 650 port_num; 651 } 652 } 653 } 654 } 655 656 /* Check for empty switch */ 657 if (next_destid == sw_destid) { 658 next_destid++; 659 if (next_destid == port->host_deviceid) 660 next_destid++; 661 } 662 663 rdev->rswitch->destid = sw_destid; 664 } else 665 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", 666 rio_name(rdev), rdev->vid, rdev->did); 667 668 return 0; 669 } 670 671 /** 672 * rio_enum_complete- Tests if enumeration of a network is complete 673 * @port: Master port to send transaction 674 * 675 * Tests the Component Tag CSR for presence of the magic enumeration 676 * complete flag. Return %1 if enumeration is complete or %0 if 677 * enumeration is incomplete. 678 */ 679 static int rio_enum_complete(struct rio_mport *port) 680 { 681 u32 tag_csr; 682 int ret = 0; 683 684 rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr); 685 686 if (tag_csr == RIO_ENUM_CMPL_MAGIC) 687 ret = 1; 688 689 return ret; 690 } 691 692 /** 693 * rio_disc_peer- Recursively discovers a RIO network through a master port 694 * @net: RIO network being discovered 695 * @port: Master port to send transactions 696 * @destid: Current destination ID in network 697 * @hopcount: Number of hops into the network 698 * 699 * Recursively discovers a RIO network. Transactions are sent via the 700 * master port passed in @port. 701 */ 702 static int 703 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, 704 u8 hopcount) 705 { 706 u8 port_num, route_port; 707 int num_ports; 708 struct rio_dev *rdev; 709 u16 ndestid; 710 711 /* Setup new RIO device */ 712 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { 713 /* Add device to the global and bus/net specific list. */ 714 list_add_tail(&rdev->net_list, &net->devices); 715 } else 716 return -1; 717 718 if (rio_is_switch(rdev)) { 719 next_switchid++; 720 721 /* Associated destid is how we accessed this switch */ 722 rdev->rswitch->destid = destid; 723 724 num_ports = rio_get_swpinfo_tports(port, destid, hopcount); 725 pr_debug( 726 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", 727 rio_name(rdev), rdev->vid, rdev->did, num_ports); 728 for (port_num = 0; port_num < num_ports; port_num++) { 729 if (rio_get_swpinfo_inport(port, destid, hopcount) == 730 port_num) 731 continue; 732 733 if (rio_sport_is_active 734 (port, destid, hopcount, port_num)) { 735 pr_debug( 736 "RIO: scanning device on port %d\n", 737 port_num); 738 for (ndestid = 0; ndestid < RIO_ANY_DESTID; 739 ndestid++) { 740 rio_route_get_entry(port, rdev->rswitch, 741 RIO_GLOBAL_TABLE, 742 ndestid, 743 &route_port); 744 if (route_port == port_num) 745 break; 746 } 747 748 if (rio_disc_peer 749 (net, port, ndestid, hopcount + 1) < 0) 750 return -1; 751 } 752 } 753 } else 754 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", 755 rio_name(rdev), rdev->vid, rdev->did); 756 757 return 0; 758 } 759 760 /** 761 * rio_mport_is_active- Tests if master port link is active 762 * @port: Master port to test 763 * 764 * Reads the port error status CSR for the master port to 765 * determine if the port has an active link. Returns 766 * %PORT_N_ERR_STS_PORT_OK if the master port is active 767 * or %0 if it is inactive. 768 */ 769 static int rio_mport_is_active(struct rio_mport *port) 770 { 771 u32 result = 0; 772 u32 ext_ftr_ptr; 773 int *entry = rio_mport_phys_table; 774 775 do { 776 if ((ext_ftr_ptr = 777 rio_mport_get_feature(port, 1, 0, 0, *entry))) 778 break; 779 } while (*++entry >= 0); 780 781 if (ext_ftr_ptr) 782 rio_local_read_config_32(port, 783 ext_ftr_ptr + 784 RIO_PORT_N_ERR_STS_CSR(port->index), 785 &result); 786 787 return (result & PORT_N_ERR_STS_PORT_OK); 788 } 789 790 /** 791 * rio_alloc_net- Allocate and configure a new RIO network 792 * @port: Master port associated with the RIO network 793 * 794 * Allocates a RIO network structure, initializes per-network 795 * list heads, and adds the associated master port to the 796 * network list of associated master ports. Returns a 797 * RIO network pointer on success or %NULL on failure. 798 */ 799 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port) 800 { 801 struct rio_net *net; 802 803 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL); 804 if (net) { 805 INIT_LIST_HEAD(&net->node); 806 INIT_LIST_HEAD(&net->devices); 807 INIT_LIST_HEAD(&net->mports); 808 list_add_tail(&port->nnode, &net->mports); 809 net->hport = port; 810 net->id = next_net++; 811 } 812 return net; 813 } 814 815 /** 816 * rio_update_route_tables- Updates route tables in switches 817 * @port: Master port associated with the RIO network 818 * 819 * For each enumerated device, ensure that each switch in a system 820 * has correct routing entries. Add routes for devices that where 821 * unknown dirung the first enumeration pass through the switch. 822 */ 823 static void rio_update_route_tables(struct rio_mport *port) 824 { 825 struct rio_dev *rdev; 826 struct rio_switch *rswitch; 827 u8 sport; 828 u16 destid; 829 830 list_for_each_entry(rdev, &rio_devices, global_list) { 831 832 destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid; 833 834 list_for_each_entry(rswitch, &rio_switches, node) { 835 836 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch)) 837 continue; 838 839 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) { 840 841 sport = rio_get_swpinfo_inport(port, 842 rswitch->destid, rswitch->hopcount); 843 844 if (rswitch->add_entry) { 845 rio_route_add_entry(port, rswitch, RIO_GLOBAL_TABLE, destid, sport); 846 rswitch->route_table[destid] = sport; 847 } 848 } 849 } 850 } 851 } 852 853 /** 854 * rio_enum_mport- Start enumeration through a master port 855 * @mport: Master port to send transactions 856 * 857 * Starts the enumeration process. If somebody has enumerated our 858 * master port device, then give up. If not and we have an active 859 * link, then start recursive peer enumeration. Returns %0 if 860 * enumeration succeeds or %-EBUSY if enumeration fails. 861 */ 862 int rio_enum_mport(struct rio_mport *mport) 863 { 864 struct rio_net *net = NULL; 865 int rc = 0; 866 867 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, 868 mport->name); 869 /* If somebody else enumerated our master port device, bail. */ 870 if (rio_enum_host(mport) < 0) { 871 printk(KERN_INFO 872 "RIO: master port %d device has been enumerated by a remote host\n", 873 mport->id); 874 rc = -EBUSY; 875 goto out; 876 } 877 878 /* If master port has an active link, allocate net and enum peers */ 879 if (rio_mport_is_active(mport)) { 880 if (!(net = rio_alloc_net(mport))) { 881 printk(KERN_ERR "RIO: failed to allocate new net\n"); 882 rc = -ENOMEM; 883 goto out; 884 } 885 if (rio_enum_peer(net, mport, 0) < 0) { 886 /* A higher priority host won enumeration, bail. */ 887 printk(KERN_INFO 888 "RIO: master port %d device has lost enumeration to a remote host\n", 889 mport->id); 890 rio_clear_locks(mport); 891 rc = -EBUSY; 892 goto out; 893 } 894 rio_update_route_tables(mport); 895 rio_clear_locks(mport); 896 } else { 897 printk(KERN_INFO "RIO: master port %d link inactive\n", 898 mport->id); 899 rc = -EINVAL; 900 } 901 902 out: 903 return rc; 904 } 905 906 /** 907 * rio_build_route_tables- Generate route tables from switch route entries 908 * 909 * For each switch device, generate a route table by copying existing 910 * route entries from the switch. 911 */ 912 static void rio_build_route_tables(void) 913 { 914 struct rio_dev *rdev; 915 int i; 916 u8 sport; 917 918 list_for_each_entry(rdev, &rio_devices, global_list) 919 if (rio_is_switch(rdev)) 920 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) { 921 if (rio_route_get_entry 922 (rdev->net->hport, rdev->rswitch, RIO_GLOBAL_TABLE, 923 i, &sport) < 0) 924 continue; 925 rdev->rswitch->route_table[i] = sport; 926 } 927 } 928 929 /** 930 * rio_enum_timeout- Signal that enumeration timed out 931 * @data: Address of timeout flag. 932 * 933 * When the enumeration complete timer expires, set a flag that 934 * signals to the discovery process that enumeration did not 935 * complete in a sane amount of time. 936 */ 937 static void rio_enum_timeout(unsigned long data) 938 { 939 /* Enumeration timed out, set flag */ 940 *(int *)data = 1; 941 } 942 943 /** 944 * rio_disc_mport- Start discovery through a master port 945 * @mport: Master port to send transactions 946 * 947 * Starts the discovery process. If we have an active link, 948 * then wait for the signal that enumeration is complete. 949 * When enumeration completion is signaled, start recursive 950 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY 951 * on failure. 952 */ 953 int rio_disc_mport(struct rio_mport *mport) 954 { 955 struct rio_net *net = NULL; 956 int enum_timeout_flag = 0; 957 958 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, 959 mport->name); 960 961 /* If master port has an active link, allocate net and discover peers */ 962 if (rio_mport_is_active(mport)) { 963 if (!(net = rio_alloc_net(mport))) { 964 printk(KERN_ERR "RIO: Failed to allocate new net\n"); 965 goto bail; 966 } 967 968 pr_debug("RIO: wait for enumeration complete..."); 969 970 rio_enum_timer.expires = 971 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; 972 rio_enum_timer.data = (unsigned long)&enum_timeout_flag; 973 add_timer(&rio_enum_timer); 974 while (!rio_enum_complete(mport)) { 975 mdelay(1); 976 if (enum_timeout_flag) { 977 del_timer_sync(&rio_enum_timer); 978 goto timeout; 979 } 980 } 981 del_timer_sync(&rio_enum_timer); 982 983 pr_debug("done\n"); 984 if (rio_disc_peer(net, mport, RIO_ANY_DESTID, 0) < 0) { 985 printk(KERN_INFO 986 "RIO: master port %d device has failed discovery\n", 987 mport->id); 988 goto bail; 989 } 990 991 rio_build_route_tables(); 992 } 993 994 return 0; 995 996 timeout: 997 pr_debug("timeout\n"); 998 bail: 999 return -EBUSY; 1000 } 1001