rio-scan.c revision a571259f4874023306db36e83054d093833b1902
1/* 2 * RapidIO enumeration and discovery support 3 * 4 * Copyright 2005 MontaVista Software, Inc. 5 * Matt Porter <mporter@kernel.crashing.org> 6 * 7 * Copyright 2009 Integrated Device Technology, Inc. 8 * Alex Bounine <alexandre.bounine@idt.com> 9 * - Added Port-Write/Error Management initialization and handling 10 * 11 * Copyright 2009 Sysgo AG 12 * Thomas Moll <thomas.moll@sysgo.com> 13 * - Added Input- Output- enable functionality, to allow full communication 14 * 15 * This program is free software; you can redistribute it and/or modify it 16 * under the terms of the GNU General Public License as published by the 17 * Free Software Foundation; either version 2 of the License, or (at your 18 * option) any later version. 19 */ 20 21#include <linux/types.h> 22#include <linux/kernel.h> 23 24#include <linux/delay.h> 25#include <linux/dma-mapping.h> 26#include <linux/init.h> 27#include <linux/rio.h> 28#include <linux/rio_drv.h> 29#include <linux/rio_ids.h> 30#include <linux/rio_regs.h> 31#include <linux/module.h> 32#include <linux/spinlock.h> 33#include <linux/timer.h> 34#include <linux/jiffies.h> 35#include <linux/slab.h> 36 37#include "rio.h" 38 39LIST_HEAD(rio_devices); 40static LIST_HEAD(rio_switches); 41 42static void rio_enum_timeout(unsigned long); 43 44static void rio_init_em(struct rio_dev *rdev); 45 46DEFINE_SPINLOCK(rio_global_list_lock); 47 48static int next_destid = 0; 49static int next_net = 0; 50static int next_comptag = 1; 51 52static struct timer_list rio_enum_timer = 53TIMER_INITIALIZER(rio_enum_timeout, 0, 0); 54 55static int rio_mport_phys_table[] = { 56 RIO_EFB_PAR_EP_ID, 57 RIO_EFB_PAR_EP_REC_ID, 58 RIO_EFB_SER_EP_ID, 59 RIO_EFB_SER_EP_REC_ID, 60 -1, 61}; 62 63/** 64 * rio_get_device_id - Get the base/extended device id for a device 65 * @port: RIO master port 66 * @destid: Destination ID of device 67 * @hopcount: Hopcount to device 68 * 69 * Reads the base/extended device id from a device. Returns the 70 * 8/16-bit device ID. 71 */ 72static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount) 73{ 74 u32 result; 75 76 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result); 77 78 return RIO_GET_DID(port->sys_size, result); 79} 80 81/** 82 * rio_set_device_id - Set the base/extended device id for a device 83 * @port: RIO master port 84 * @destid: Destination ID of device 85 * @hopcount: Hopcount to device 86 * @did: Device ID value to be written 87 * 88 * Writes the base/extended device id from a device. 89 */ 90static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did) 91{ 92 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR, 93 RIO_SET_DID(port->sys_size, did)); 94} 95 96/** 97 * rio_local_set_device_id - Set the base/extended device id for a port 98 * @port: RIO master port 99 * @did: Device ID value to be written 100 * 101 * Writes the base/extended device id from a device. 102 */ 103static void rio_local_set_device_id(struct rio_mport *port, u16 did) 104{ 105 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size, 106 did)); 107} 108 109/** 110 * rio_clear_locks- Release all host locks and signal enumeration complete 111 * @port: Master port to issue transaction 112 * 113 * Marks the component tag CSR on each device with the enumeration 114 * complete flag. When complete, it then release the host locks on 115 * each device. Returns 0 on success or %-EINVAL on failure. 116 */ 117static int rio_clear_locks(struct rio_mport *port) 118{ 119 struct rio_dev *rdev; 120 u32 result; 121 int ret = 0; 122 123 /* Release host device id locks */ 124 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, 125 port->host_deviceid); 126 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); 127 if ((result & 0xffff) != 0xffff) { 128 printk(KERN_INFO 129 "RIO: badness when releasing host lock on master port, result %8.8x\n", 130 result); 131 ret = -EINVAL; 132 } 133 list_for_each_entry(rdev, &rio_devices, global_list) { 134 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR, 135 port->host_deviceid); 136 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result); 137 if ((result & 0xffff) != 0xffff) { 138 printk(KERN_INFO 139 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n", 140 rdev->vid, rdev->did); 141 ret = -EINVAL; 142 } 143 144 /* Mark device as discovered and enable master */ 145 rio_read_config_32(rdev, 146 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, 147 &result); 148 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER; 149 rio_write_config_32(rdev, 150 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, 151 result); 152 } 153 154 return ret; 155} 156 157/** 158 * rio_enum_host- Set host lock and initialize host destination ID 159 * @port: Master port to issue transaction 160 * 161 * Sets the local host master port lock and destination ID register 162 * with the host device ID value. The host device ID value is provided 163 * by the platform. Returns %0 on success or %-1 on failure. 164 */ 165static int rio_enum_host(struct rio_mport *port) 166{ 167 u32 result; 168 169 /* Set master port host device id lock */ 170 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, 171 port->host_deviceid); 172 173 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); 174 if ((result & 0xffff) != port->host_deviceid) 175 return -1; 176 177 /* Set master port destid and init destid ctr */ 178 rio_local_set_device_id(port, port->host_deviceid); 179 180 if (next_destid == port->host_deviceid) 181 next_destid++; 182 183 return 0; 184} 185 186/** 187 * rio_device_has_destid- Test if a device contains a destination ID register 188 * @port: Master port to issue transaction 189 * @src_ops: RIO device source operations 190 * @dst_ops: RIO device destination operations 191 * 192 * Checks the provided @src_ops and @dst_ops for the necessary transaction 193 * capabilities that indicate whether or not a device will implement a 194 * destination ID register. Returns 1 if true or 0 if false. 195 */ 196static int rio_device_has_destid(struct rio_mport *port, int src_ops, 197 int dst_ops) 198{ 199 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; 200 201 return !!((src_ops | dst_ops) & mask); 202} 203 204/** 205 * rio_release_dev- Frees a RIO device struct 206 * @dev: LDM device associated with a RIO device struct 207 * 208 * Gets the RIO device struct associated a RIO device struct. 209 * The RIO device struct is freed. 210 */ 211static void rio_release_dev(struct device *dev) 212{ 213 struct rio_dev *rdev; 214 215 rdev = to_rio_dev(dev); 216 kfree(rdev); 217} 218 219/** 220 * rio_is_switch- Tests if a RIO device has switch capabilities 221 * @rdev: RIO device 222 * 223 * Gets the RIO device Processing Element Features register 224 * contents and tests for switch capabilities. Returns 1 if 225 * the device is a switch or 0 if it is not a switch. 226 * The RIO device struct is freed. 227 */ 228static int rio_is_switch(struct rio_dev *rdev) 229{ 230 if (rdev->pef & RIO_PEF_SWITCH) 231 return 1; 232 return 0; 233} 234 235/** 236 * rio_switch_init - Sets switch operations for a particular vendor switch 237 * @rdev: RIO device 238 * @do_enum: Enumeration/Discovery mode flag 239 * 240 * Searches the RIO switch ops table for known switch types. If the vid 241 * and did match a switch table entry, then call switch initialization 242 * routine to setup switch-specific routines. 243 */ 244static void rio_switch_init(struct rio_dev *rdev, int do_enum) 245{ 246 struct rio_switch_ops *cur = __start_rio_switch_ops; 247 struct rio_switch_ops *end = __end_rio_switch_ops; 248 249 while (cur < end) { 250 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) { 251 pr_debug("RIO: calling init routine for %s\n", 252 rio_name(rdev)); 253 cur->init_hook(rdev, do_enum); 254 break; 255 } 256 cur++; 257 } 258 259 if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) { 260 pr_debug("RIO: adding STD routing ops for %s\n", 261 rio_name(rdev)); 262 rdev->rswitch->add_entry = rio_std_route_add_entry; 263 rdev->rswitch->get_entry = rio_std_route_get_entry; 264 rdev->rswitch->clr_table = rio_std_route_clr_table; 265 } 266 267 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry) 268 printk(KERN_ERR "RIO: missing routing ops for %s\n", 269 rio_name(rdev)); 270} 271 272/** 273 * rio_add_device- Adds a RIO device to the device model 274 * @rdev: RIO device 275 * 276 * Adds the RIO device to the global device list and adds the RIO 277 * device to the RIO device list. Creates the generic sysfs nodes 278 * for an RIO device. 279 */ 280static int __devinit rio_add_device(struct rio_dev *rdev) 281{ 282 int err; 283 284 err = device_add(&rdev->dev); 285 if (err) 286 return err; 287 288 spin_lock(&rio_global_list_lock); 289 list_add_tail(&rdev->global_list, &rio_devices); 290 spin_unlock(&rio_global_list_lock); 291 292 rio_create_sysfs_dev_files(rdev); 293 294 return 0; 295} 296 297/** 298 * rio_enable_rx_tx_port - enable input receiver and output transmitter of 299 * given port 300 * @port: Master port associated with the RIO network 301 * @local: local=1 select local port otherwise a far device is reached 302 * @destid: Destination ID of the device to check host bit 303 * @hopcount: Number of hops to reach the target 304 * @port_num: Port (-number on switch) to enable on a far end device 305 * 306 * Returns 0 or 1 from on General Control Command and Status Register 307 * (EXT_PTR+0x3C) 308 */ 309inline int rio_enable_rx_tx_port(struct rio_mport *port, 310 int local, u16 destid, 311 u8 hopcount, u8 port_num) { 312#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS 313 u32 regval; 314 u32 ext_ftr_ptr; 315 316 /* 317 * enable rx input tx output port 318 */ 319 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = " 320 "%d, port_num = %d)\n", local, destid, hopcount, port_num); 321 322 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount); 323 324 if (local) { 325 rio_local_read_config_32(port, ext_ftr_ptr + 326 RIO_PORT_N_CTL_CSR(0), 327 ®val); 328 } else { 329 if (rio_mport_read_config_32(port, destid, hopcount, 330 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0) 331 return -EIO; 332 } 333 334 if (regval & RIO_PORT_N_CTL_P_TYP_SER) { 335 /* serial */ 336 regval = regval | RIO_PORT_N_CTL_EN_RX_SER 337 | RIO_PORT_N_CTL_EN_TX_SER; 338 } else { 339 /* parallel */ 340 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR 341 | RIO_PORT_N_CTL_EN_TX_PAR; 342 } 343 344 if (local) { 345 rio_local_write_config_32(port, ext_ftr_ptr + 346 RIO_PORT_N_CTL_CSR(0), regval); 347 } else { 348 if (rio_mport_write_config_32(port, destid, hopcount, 349 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0) 350 return -EIO; 351 } 352#endif 353 return 0; 354} 355 356/** 357 * rio_setup_device- Allocates and sets up a RIO device 358 * @net: RIO network 359 * @port: Master port to send transactions 360 * @destid: Current destination ID 361 * @hopcount: Current hopcount 362 * @do_enum: Enumeration/Discovery mode flag 363 * 364 * Allocates a RIO device and configures fields based on configuration 365 * space contents. If device has a destination ID register, a destination 366 * ID is either assigned in enumeration mode or read from configuration 367 * space in discovery mode. If the device has switch capabilities, then 368 * a switch is allocated and configured appropriately. Returns a pointer 369 * to a RIO device on success or NULL on failure. 370 * 371 */ 372static struct rio_dev __devinit *rio_setup_device(struct rio_net *net, 373 struct rio_mport *port, u16 destid, 374 u8 hopcount, int do_enum) 375{ 376 int ret = 0; 377 struct rio_dev *rdev; 378 struct rio_switch *rswitch = NULL; 379 int result, rdid; 380 size_t size; 381 u32 swpinfo = 0; 382 383 size = sizeof(struct rio_dev); 384 if (rio_mport_read_config_32(port, destid, hopcount, 385 RIO_PEF_CAR, &result)) 386 return NULL; 387 388 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) { 389 rio_mport_read_config_32(port, destid, hopcount, 390 RIO_SWP_INFO_CAR, &swpinfo); 391 if (result & RIO_PEF_SWITCH) { 392 size += (RIO_GET_TOTAL_PORTS(swpinfo) * 393 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch); 394 } 395 } 396 397 rdev = kzalloc(size, GFP_KERNEL); 398 if (!rdev) 399 return NULL; 400 401 rdev->net = net; 402 rdev->pef = result; 403 rdev->swpinfo = swpinfo; 404 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR, 405 &result); 406 rdev->did = result >> 16; 407 rdev->vid = result & 0xffff; 408 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR, 409 &rdev->device_rev); 410 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR, 411 &result); 412 rdev->asm_did = result >> 16; 413 rdev->asm_vid = result & 0xffff; 414 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR, 415 &result); 416 rdev->asm_rev = result >> 16; 417 if (rdev->pef & RIO_PEF_EXT_FEATURES) { 418 rdev->efptr = result & 0xffff; 419 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid, 420 hopcount); 421 422 rdev->em_efptr = rio_mport_get_feature(port, 0, destid, 423 hopcount, RIO_EFB_ERR_MGMNT); 424 } 425 426 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR, 427 &rdev->src_ops); 428 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR, 429 &rdev->dst_ops); 430 431 if (do_enum) { 432 /* Assign component tag to device */ 433 if (next_comptag >= 0x10000) { 434 pr_err("RIO: Component Tag Counter Overflow\n"); 435 goto cleanup; 436 } 437 rio_mport_write_config_32(port, destid, hopcount, 438 RIO_COMPONENT_TAG_CSR, next_comptag); 439 rdev->comp_tag = next_comptag++; 440 } else { 441 rio_mport_read_config_32(port, destid, hopcount, 442 RIO_COMPONENT_TAG_CSR, 443 &rdev->comp_tag); 444 } 445 446 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { 447 if (do_enum) { 448 rio_set_device_id(port, destid, hopcount, next_destid); 449 rdev->destid = next_destid++; 450 if (next_destid == port->host_deviceid) 451 next_destid++; 452 } else 453 rdev->destid = rio_get_device_id(port, destid, hopcount); 454 455 rdev->hopcount = 0xff; 456 } else { 457 /* Switch device has an associated destID which 458 * will be adjusted later 459 */ 460 rdev->destid = destid; 461 rdev->hopcount = hopcount; 462 } 463 464 /* If a PE has both switch and other functions, show it as a switch */ 465 if (rio_is_switch(rdev)) { 466 rswitch = rdev->rswitch; 467 rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID; 468 rswitch->port_ok = 0; 469 rswitch->route_table = kzalloc(sizeof(u8)* 470 RIO_MAX_ROUTE_ENTRIES(port->sys_size), 471 GFP_KERNEL); 472 if (!rswitch->route_table) 473 goto cleanup; 474 /* Initialize switch route table */ 475 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size); 476 rdid++) 477 rswitch->route_table[rdid] = RIO_INVALID_ROUTE; 478 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id, 479 rswitch->switchid); 480 rio_switch_init(rdev, do_enum); 481 482 if (do_enum && rswitch->clr_table) 483 rswitch->clr_table(port, destid, hopcount, 484 RIO_GLOBAL_TABLE); 485 486 list_add_tail(&rswitch->node, &rio_switches); 487 488 } else { 489 if (do_enum) 490 /*Enable Input Output Port (transmitter reviever)*/ 491 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0); 492 493 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id, 494 rdev->destid); 495 } 496 497 rdev->dev.bus = &rio_bus_type; 498 rdev->dev.parent = &rio_bus; 499 500 device_initialize(&rdev->dev); 501 rdev->dev.release = rio_release_dev; 502 rio_dev_get(rdev); 503 504 rdev->dma_mask = DMA_BIT_MASK(32); 505 rdev->dev.dma_mask = &rdev->dma_mask; 506 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 507 508 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL) 509 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], 510 0, 0xffff); 511 512 ret = rio_add_device(rdev); 513 if (ret) 514 goto cleanup; 515 516 return rdev; 517 518cleanup: 519 if (rio_is_switch(rdev)) 520 kfree(rswitch->route_table); 521 522 kfree(rdev); 523 return NULL; 524} 525 526/** 527 * rio_sport_is_active- Tests if a switch port has an active connection. 528 * @port: Master port to send transaction 529 * @destid: Associated destination ID for switch 530 * @hopcount: Hopcount to reach switch 531 * @sport: Switch port number 532 * 533 * Reads the port error status CSR for a particular switch port to 534 * determine if the port has an active link. Returns 535 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is 536 * inactive. 537 */ 538static int 539rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport) 540{ 541 u32 result = 0; 542 u32 ext_ftr_ptr; 543 544 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0); 545 546 while (ext_ftr_ptr) { 547 rio_mport_read_config_32(port, destid, hopcount, 548 ext_ftr_ptr, &result); 549 result = RIO_GET_BLOCK_ID(result); 550 if ((result == RIO_EFB_SER_EP_FREE_ID) || 551 (result == RIO_EFB_SER_EP_FREE_ID_V13P) || 552 (result == RIO_EFB_SER_EP_FREC_ID)) 553 break; 554 555 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 556 ext_ftr_ptr); 557 } 558 559 if (ext_ftr_ptr) 560 rio_mport_read_config_32(port, destid, hopcount, 561 ext_ftr_ptr + 562 RIO_PORT_N_ERR_STS_CSR(sport), 563 &result); 564 565 return result & RIO_PORT_N_ERR_STS_PORT_OK; 566} 567 568/** 569 * rio_lock_device - Acquires host device lock for specified device 570 * @port: Master port to send transaction 571 * @destid: Destination ID for device/switch 572 * @hopcount: Hopcount to reach switch 573 * @wait_ms: Max wait time in msec (0 = no timeout) 574 * 575 * Attepts to acquire host device lock for specified device 576 * Returns 0 if device lock acquired or EINVAL if timeout expires. 577 */ 578static int 579rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms) 580{ 581 u32 result; 582 int tcnt = 0; 583 584 /* Attempt to acquire device lock */ 585 rio_mport_write_config_32(port, destid, hopcount, 586 RIO_HOST_DID_LOCK_CSR, port->host_deviceid); 587 rio_mport_read_config_32(port, destid, hopcount, 588 RIO_HOST_DID_LOCK_CSR, &result); 589 590 while (result != port->host_deviceid) { 591 if (wait_ms != 0 && tcnt == wait_ms) { 592 pr_debug("RIO: timeout when locking device %x:%x\n", 593 destid, hopcount); 594 return -EINVAL; 595 } 596 597 /* Delay a bit */ 598 mdelay(1); 599 tcnt++; 600 /* Try to acquire device lock again */ 601 rio_mport_write_config_32(port, destid, 602 hopcount, 603 RIO_HOST_DID_LOCK_CSR, 604 port->host_deviceid); 605 rio_mport_read_config_32(port, destid, 606 hopcount, 607 RIO_HOST_DID_LOCK_CSR, &result); 608 } 609 610 return 0; 611} 612 613/** 614 * rio_unlock_device - Releases host device lock for specified device 615 * @port: Master port to send transaction 616 * @destid: Destination ID for device/switch 617 * @hopcount: Hopcount to reach switch 618 * 619 * Returns 0 if device lock released or EINVAL if fails. 620 */ 621static int 622rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount) 623{ 624 u32 result; 625 626 /* Release device lock */ 627 rio_mport_write_config_32(port, destid, 628 hopcount, 629 RIO_HOST_DID_LOCK_CSR, 630 port->host_deviceid); 631 rio_mport_read_config_32(port, destid, hopcount, 632 RIO_HOST_DID_LOCK_CSR, &result); 633 if ((result & 0xffff) != 0xffff) { 634 pr_debug("RIO: badness when releasing device lock %x:%x\n", 635 destid, hopcount); 636 return -EINVAL; 637 } 638 639 return 0; 640} 641 642/** 643 * rio_route_add_entry- Add a route entry to a switch routing table 644 * @rdev: RIO device 645 * @table: Routing table ID 646 * @route_destid: Destination ID to be routed 647 * @route_port: Port number to be routed 648 * @lock: lock switch device flag 649 * 650 * Calls the switch specific add_entry() method to add a route entry 651 * on a switch. The route table can be specified using the @table 652 * argument if a switch has per port routing tables or the normal 653 * use is to specific all tables (or the global table) by passing 654 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL 655 * on failure. 656 */ 657static int 658rio_route_add_entry(struct rio_dev *rdev, 659 u16 table, u16 route_destid, u8 route_port, int lock) 660{ 661 int rc; 662 663 if (lock) { 664 rc = rio_lock_device(rdev->net->hport, rdev->destid, 665 rdev->hopcount, 1000); 666 if (rc) 667 return rc; 668 } 669 670 rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid, 671 rdev->hopcount, table, 672 route_destid, route_port); 673 if (lock) 674 rio_unlock_device(rdev->net->hport, rdev->destid, 675 rdev->hopcount); 676 677 return rc; 678} 679 680/** 681 * rio_route_get_entry- Read a route entry in a switch routing table 682 * @rdev: RIO device 683 * @table: Routing table ID 684 * @route_destid: Destination ID to be routed 685 * @route_port: Pointer to read port number into 686 * @lock: lock switch device flag 687 * 688 * Calls the switch specific get_entry() method to read a route entry 689 * in a switch. The route table can be specified using the @table 690 * argument if a switch has per port routing tables or the normal 691 * use is to specific all tables (or the global table) by passing 692 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL 693 * on failure. 694 */ 695static int 696rio_route_get_entry(struct rio_dev *rdev, u16 table, 697 u16 route_destid, u8 *route_port, int lock) 698{ 699 int rc; 700 701 if (lock) { 702 rc = rio_lock_device(rdev->net->hport, rdev->destid, 703 rdev->hopcount, 1000); 704 if (rc) 705 return rc; 706 } 707 708 rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid, 709 rdev->hopcount, table, 710 route_destid, route_port); 711 if (lock) 712 rio_unlock_device(rdev->net->hport, rdev->destid, 713 rdev->hopcount); 714 715 return rc; 716} 717 718/** 719 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device 720 * @port: Master port to send transaction 721 * @hopcount: Number of hops to the device 722 * 723 * Used during enumeration to read the Host Device ID Lock CSR on a 724 * RIO device. Returns the value of the lock register. 725 */ 726static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) 727{ 728 u32 result; 729 730 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount, 731 RIO_HOST_DID_LOCK_CSR, &result); 732 733 return (u16) (result & 0xffff); 734} 735 736/** 737 * rio_enum_peer- Recursively enumerate a RIO network through a master port 738 * @net: RIO network being enumerated 739 * @port: Master port to send transactions 740 * @hopcount: Number of hops into the network 741 * @prev: Previous RIO device connected to the enumerated one 742 * @prev_port: Port on previous RIO device 743 * 744 * Recursively enumerates a RIO network. Transactions are sent via the 745 * master port passed in @port. 746 */ 747static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port, 748 u8 hopcount, struct rio_dev *prev, int prev_port) 749{ 750 int port_num; 751 int cur_destid; 752 int sw_destid; 753 int sw_inport; 754 struct rio_dev *rdev; 755 u16 destid; 756 u32 regval; 757 int tmp; 758 759 if (rio_mport_chk_dev_access(port, 760 RIO_ANY_DESTID(port->sys_size), hopcount)) { 761 pr_debug("RIO: device access check failed\n"); 762 return -1; 763 } 764 765 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { 766 pr_debug("RIO: PE already discovered by this host\n"); 767 /* 768 * Already discovered by this host. Add it as another 769 * link to the existing device. 770 */ 771 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), 772 hopcount, RIO_COMPONENT_TAG_CSR, ®val); 773 774 if (regval) { 775 rdev = rio_get_comptag((regval & 0xffff), NULL); 776 777 if (rdev && prev && rio_is_switch(prev)) { 778 pr_debug("RIO: redundant path to %s\n", 779 rio_name(rdev)); 780 prev->rswitch->nextdev[prev_port] = rdev; 781 } 782 } 783 784 return 0; 785 } 786 787 /* Attempt to acquire device lock */ 788 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), 789 hopcount, 790 RIO_HOST_DID_LOCK_CSR, port->host_deviceid); 791 while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) 792 < port->host_deviceid) { 793 /* Delay a bit */ 794 mdelay(1); 795 /* Attempt to acquire device lock again */ 796 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), 797 hopcount, 798 RIO_HOST_DID_LOCK_CSR, 799 port->host_deviceid); 800 } 801 802 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { 803 pr_debug( 804 "RIO: PE locked by a higher priority host...retreating\n"); 805 return -1; 806 } 807 808 /* Setup new RIO device */ 809 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size), 810 hopcount, 1); 811 if (rdev) { 812 /* Add device to the global and bus/net specific list. */ 813 list_add_tail(&rdev->net_list, &net->devices); 814 rdev->prev = prev; 815 if (prev && rio_is_switch(prev)) 816 prev->rswitch->nextdev[prev_port] = rdev; 817 } else 818 return -1; 819 820 if (rio_is_switch(rdev)) { 821 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo); 822 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, 823 port->host_deviceid, sw_inport, 0); 824 rdev->rswitch->route_table[port->host_deviceid] = sw_inport; 825 826 for (destid = 0; destid < next_destid; destid++) { 827 if (destid == port->host_deviceid) 828 continue; 829 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, 830 destid, sw_inport, 0); 831 rdev->rswitch->route_table[destid] = sw_inport; 832 } 833 834 pr_debug( 835 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", 836 rio_name(rdev), rdev->vid, rdev->did, 837 RIO_GET_TOTAL_PORTS(rdev->swpinfo)); 838 sw_destid = next_destid; 839 for (port_num = 0; 840 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); 841 port_num++) { 842 /*Enable Input Output Port (transmitter reviever)*/ 843 rio_enable_rx_tx_port(port, 0, 844 RIO_ANY_DESTID(port->sys_size), 845 hopcount, port_num); 846 847 if (sw_inport == port_num) { 848 rdev->rswitch->port_ok |= (1 << port_num); 849 continue; 850 } 851 852 cur_destid = next_destid; 853 854 if (rio_sport_is_active 855 (port, RIO_ANY_DESTID(port->sys_size), hopcount, 856 port_num)) { 857 pr_debug( 858 "RIO: scanning device on port %d\n", 859 port_num); 860 rdev->rswitch->port_ok |= (1 << port_num); 861 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, 862 RIO_ANY_DESTID(port->sys_size), 863 port_num, 0); 864 865 if (rio_enum_peer(net, port, hopcount + 1, 866 rdev, port_num) < 0) 867 return -1; 868 869 /* Update routing tables */ 870 if (next_destid > cur_destid) { 871 for (destid = cur_destid; 872 destid < next_destid; destid++) { 873 if (destid == port->host_deviceid) 874 continue; 875 rio_route_add_entry(rdev, 876 RIO_GLOBAL_TABLE, 877 destid, 878 port_num, 879 0); 880 rdev->rswitch-> 881 route_table[destid] = 882 port_num; 883 } 884 } 885 } else { 886 /* If switch supports Error Management, 887 * set PORT_LOCKOUT bit for unused port 888 */ 889 if (rdev->em_efptr) 890 rio_set_port_lockout(rdev, port_num, 1); 891 892 rdev->rswitch->port_ok &= ~(1 << port_num); 893 } 894 } 895 896 /* Direct Port-write messages to the enumeratiing host */ 897 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) && 898 (rdev->em_efptr)) { 899 rio_write_config_32(rdev, 900 rdev->em_efptr + RIO_EM_PW_TGT_DEVID, 901 (port->host_deviceid << 16) | 902 (port->sys_size << 15)); 903 } 904 905 rio_init_em(rdev); 906 907 /* Check for empty switch */ 908 if (next_destid == sw_destid) { 909 next_destid++; 910 if (next_destid == port->host_deviceid) 911 next_destid++; 912 } 913 914 rdev->destid = sw_destid; 915 } else 916 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", 917 rio_name(rdev), rdev->vid, rdev->did); 918 919 return 0; 920} 921 922/** 923 * rio_enum_complete- Tests if enumeration of a network is complete 924 * @port: Master port to send transaction 925 * 926 * Tests the PGCCSR discovered bit for non-zero value (enumeration 927 * complete flag). Return %1 if enumeration is complete or %0 if 928 * enumeration is incomplete. 929 */ 930static int rio_enum_complete(struct rio_mport *port) 931{ 932 u32 regval; 933 934 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR, 935 ®val); 936 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0; 937} 938 939/** 940 * rio_disc_peer- Recursively discovers a RIO network through a master port 941 * @net: RIO network being discovered 942 * @port: Master port to send transactions 943 * @destid: Current destination ID in network 944 * @hopcount: Number of hops into the network 945 * @prev: previous rio_dev 946 * @prev_port: previous port number 947 * 948 * Recursively discovers a RIO network. Transactions are sent via the 949 * master port passed in @port. 950 */ 951static int __devinit 952rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, 953 u8 hopcount, struct rio_dev *prev, int prev_port) 954{ 955 u8 port_num, route_port; 956 struct rio_dev *rdev; 957 u16 ndestid; 958 959 /* Setup new RIO device */ 960 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { 961 /* Add device to the global and bus/net specific list. */ 962 list_add_tail(&rdev->net_list, &net->devices); 963 rdev->prev = prev; 964 if (prev && rio_is_switch(prev)) 965 prev->rswitch->nextdev[prev_port] = rdev; 966 } else 967 return -1; 968 969 if (rio_is_switch(rdev)) { 970 /* Associated destid is how we accessed this switch */ 971 rdev->destid = destid; 972 973 pr_debug( 974 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", 975 rio_name(rdev), rdev->vid, rdev->did, 976 RIO_GET_TOTAL_PORTS(rdev->swpinfo)); 977 for (port_num = 0; 978 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); 979 port_num++) { 980 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num) 981 continue; 982 983 if (rio_sport_is_active 984 (port, destid, hopcount, port_num)) { 985 pr_debug( 986 "RIO: scanning device on port %d\n", 987 port_num); 988 989 rio_lock_device(port, destid, hopcount, 1000); 990 991 for (ndestid = 0; 992 ndestid < RIO_ANY_DESTID(port->sys_size); 993 ndestid++) { 994 rio_route_get_entry(rdev, 995 RIO_GLOBAL_TABLE, 996 ndestid, 997 &route_port, 0); 998 if (route_port == port_num) 999 break; 1000 } 1001 1002 if (ndestid == RIO_ANY_DESTID(port->sys_size)) 1003 continue; 1004 rio_unlock_device(port, destid, hopcount); 1005 if (rio_disc_peer(net, port, ndestid, 1006 hopcount + 1, rdev, port_num) < 0) 1007 return -1; 1008 } 1009 } 1010 } else 1011 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", 1012 rio_name(rdev), rdev->vid, rdev->did); 1013 1014 return 0; 1015} 1016 1017/** 1018 * rio_mport_is_active- Tests if master port link is active 1019 * @port: Master port to test 1020 * 1021 * Reads the port error status CSR for the master port to 1022 * determine if the port has an active link. Returns 1023 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active 1024 * or %0 if it is inactive. 1025 */ 1026static int rio_mport_is_active(struct rio_mport *port) 1027{ 1028 u32 result = 0; 1029 u32 ext_ftr_ptr; 1030 int *entry = rio_mport_phys_table; 1031 1032 do { 1033 if ((ext_ftr_ptr = 1034 rio_mport_get_feature(port, 1, 0, 0, *entry))) 1035 break; 1036 } while (*++entry >= 0); 1037 1038 if (ext_ftr_ptr) 1039 rio_local_read_config_32(port, 1040 ext_ftr_ptr + 1041 RIO_PORT_N_ERR_STS_CSR(port->index), 1042 &result); 1043 1044 return result & RIO_PORT_N_ERR_STS_PORT_OK; 1045} 1046 1047/** 1048 * rio_alloc_net- Allocate and configure a new RIO network 1049 * @port: Master port associated with the RIO network 1050 * 1051 * Allocates a RIO network structure, initializes per-network 1052 * list heads, and adds the associated master port to the 1053 * network list of associated master ports. Returns a 1054 * RIO network pointer on success or %NULL on failure. 1055 */ 1056static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port) 1057{ 1058 struct rio_net *net; 1059 1060 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL); 1061 if (net) { 1062 INIT_LIST_HEAD(&net->node); 1063 INIT_LIST_HEAD(&net->devices); 1064 INIT_LIST_HEAD(&net->mports); 1065 list_add_tail(&port->nnode, &net->mports); 1066 net->hport = port; 1067 net->id = next_net++; 1068 } 1069 return net; 1070} 1071 1072/** 1073 * rio_update_route_tables- Updates route tables in switches 1074 * @port: Master port associated with the RIO network 1075 * 1076 * For each enumerated device, ensure that each switch in a system 1077 * has correct routing entries. Add routes for devices that where 1078 * unknown dirung the first enumeration pass through the switch. 1079 */ 1080static void rio_update_route_tables(struct rio_mport *port) 1081{ 1082 struct rio_dev *rdev, *swrdev; 1083 struct rio_switch *rswitch; 1084 u8 sport; 1085 u16 destid; 1086 1087 list_for_each_entry(rdev, &rio_devices, global_list) { 1088 1089 destid = rdev->destid; 1090 1091 list_for_each_entry(rswitch, &rio_switches, node) { 1092 1093 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch)) 1094 continue; 1095 1096 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) { 1097 swrdev = sw_to_rio_dev(rswitch); 1098 1099 /* Skip if destid ends in empty switch*/ 1100 if (swrdev->destid == destid) 1101 continue; 1102 1103 sport = RIO_GET_PORT_NUM(swrdev->swpinfo); 1104 1105 if (rswitch->add_entry) { 1106 rio_route_add_entry(swrdev, 1107 RIO_GLOBAL_TABLE, destid, 1108 sport, 0); 1109 rswitch->route_table[destid] = sport; 1110 } 1111 } 1112 } 1113 } 1114} 1115 1116/** 1117 * rio_init_em - Initializes RIO Error Management (for switches) 1118 * @rdev: RIO device 1119 * 1120 * For each enumerated switch, call device-specific error management 1121 * initialization routine (if supplied by the switch driver). 1122 */ 1123static void rio_init_em(struct rio_dev *rdev) 1124{ 1125 if (rio_is_switch(rdev) && (rdev->em_efptr) && 1126 (rdev->rswitch->em_init)) { 1127 rdev->rswitch->em_init(rdev); 1128 } 1129} 1130 1131/** 1132 * rio_pw_enable - Enables/disables port-write handling by a master port 1133 * @port: Master port associated with port-write handling 1134 * @enable: 1=enable, 0=disable 1135 */ 1136static void rio_pw_enable(struct rio_mport *port, int enable) 1137{ 1138 if (port->ops->pwenable) 1139 port->ops->pwenable(port, enable); 1140} 1141 1142/** 1143 * rio_enum_mport- Start enumeration through a master port 1144 * @mport: Master port to send transactions 1145 * 1146 * Starts the enumeration process. If somebody has enumerated our 1147 * master port device, then give up. If not and we have an active 1148 * link, then start recursive peer enumeration. Returns %0 if 1149 * enumeration succeeds or %-EBUSY if enumeration fails. 1150 */ 1151int __devinit rio_enum_mport(struct rio_mport *mport) 1152{ 1153 struct rio_net *net = NULL; 1154 int rc = 0; 1155 1156 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, 1157 mport->name); 1158 /* If somebody else enumerated our master port device, bail. */ 1159 if (rio_enum_host(mport) < 0) { 1160 printk(KERN_INFO 1161 "RIO: master port %d device has been enumerated by a remote host\n", 1162 mport->id); 1163 rc = -EBUSY; 1164 goto out; 1165 } 1166 1167 /* If master port has an active link, allocate net and enum peers */ 1168 if (rio_mport_is_active(mport)) { 1169 if (!(net = rio_alloc_net(mport))) { 1170 printk(KERN_ERR "RIO: failed to allocate new net\n"); 1171 rc = -ENOMEM; 1172 goto out; 1173 } 1174 1175 /* Enable Input Output Port (transmitter reviever) */ 1176 rio_enable_rx_tx_port(mport, 1, 0, 0, 0); 1177 1178 /* Set component tag for host */ 1179 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR, 1180 next_comptag++); 1181 1182 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) { 1183 /* A higher priority host won enumeration, bail. */ 1184 printk(KERN_INFO 1185 "RIO: master port %d device has lost enumeration to a remote host\n", 1186 mport->id); 1187 rio_clear_locks(mport); 1188 rc = -EBUSY; 1189 goto out; 1190 } 1191 rio_update_route_tables(mport); 1192 rio_clear_locks(mport); 1193 rio_pw_enable(mport, 1); 1194 } else { 1195 printk(KERN_INFO "RIO: master port %d link inactive\n", 1196 mport->id); 1197 rc = -EINVAL; 1198 } 1199 1200 out: 1201 return rc; 1202} 1203 1204/** 1205 * rio_build_route_tables- Generate route tables from switch route entries 1206 * 1207 * For each switch device, generate a route table by copying existing 1208 * route entries from the switch. 1209 */ 1210static void rio_build_route_tables(void) 1211{ 1212 struct rio_dev *rdev; 1213 int i; 1214 u8 sport; 1215 1216 list_for_each_entry(rdev, &rio_devices, global_list) 1217 if (rio_is_switch(rdev)) { 1218 rio_lock_device(rdev->net->hport, rdev->destid, 1219 rdev->hopcount, 1000); 1220 for (i = 0; 1221 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size); 1222 i++) { 1223 if (rio_route_get_entry(rdev, 1224 RIO_GLOBAL_TABLE, i, &sport, 0) < 0) 1225 continue; 1226 rdev->rswitch->route_table[i] = sport; 1227 } 1228 1229 rio_unlock_device(rdev->net->hport, 1230 rdev->destid, 1231 rdev->hopcount); 1232 } 1233} 1234 1235/** 1236 * rio_enum_timeout- Signal that enumeration timed out 1237 * @data: Address of timeout flag. 1238 * 1239 * When the enumeration complete timer expires, set a flag that 1240 * signals to the discovery process that enumeration did not 1241 * complete in a sane amount of time. 1242 */ 1243static void rio_enum_timeout(unsigned long data) 1244{ 1245 /* Enumeration timed out, set flag */ 1246 *(int *)data = 1; 1247} 1248 1249/** 1250 * rio_disc_mport- Start discovery through a master port 1251 * @mport: Master port to send transactions 1252 * 1253 * Starts the discovery process. If we have an active link, 1254 * then wait for the signal that enumeration is complete. 1255 * When enumeration completion is signaled, start recursive 1256 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY 1257 * on failure. 1258 */ 1259int __devinit rio_disc_mport(struct rio_mport *mport) 1260{ 1261 struct rio_net *net = NULL; 1262 int enum_timeout_flag = 0; 1263 1264 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, 1265 mport->name); 1266 1267 /* If master port has an active link, allocate net and discover peers */ 1268 if (rio_mport_is_active(mport)) { 1269 if (!(net = rio_alloc_net(mport))) { 1270 printk(KERN_ERR "RIO: Failed to allocate new net\n"); 1271 goto bail; 1272 } 1273 1274 pr_debug("RIO: wait for enumeration complete..."); 1275 1276 rio_enum_timer.expires = 1277 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; 1278 rio_enum_timer.data = (unsigned long)&enum_timeout_flag; 1279 add_timer(&rio_enum_timer); 1280 while (!rio_enum_complete(mport)) { 1281 mdelay(1); 1282 if (enum_timeout_flag) { 1283 del_timer_sync(&rio_enum_timer); 1284 goto timeout; 1285 } 1286 } 1287 del_timer_sync(&rio_enum_timer); 1288 1289 pr_debug("done\n"); 1290 1291 /* Read DestID assigned by enumerator */ 1292 rio_local_read_config_32(mport, RIO_DID_CSR, 1293 &mport->host_deviceid); 1294 mport->host_deviceid = RIO_GET_DID(mport->sys_size, 1295 mport->host_deviceid); 1296 1297 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size), 1298 0, NULL, 0) < 0) { 1299 printk(KERN_INFO 1300 "RIO: master port %d device has failed discovery\n", 1301 mport->id); 1302 goto bail; 1303 } 1304 1305 rio_build_route_tables(); 1306 } 1307 1308 return 0; 1309 1310 timeout: 1311 pr_debug("timeout\n"); 1312 bail: 1313 return -EBUSY; 1314} 1315