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