rio-scan.c revision ded05782719d0f7e79af98be7cf88c7e23a90435
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_switchid = 0; 50static int next_net = 0; 51static int next_comptag = 1; 52 53static struct timer_list rio_enum_timer = 54TIMER_INITIALIZER(rio_enum_timeout, 0, 0); 55 56static int rio_mport_phys_table[] = { 57 RIO_EFB_PAR_EP_ID, 58 RIO_EFB_PAR_EP_REC_ID, 59 RIO_EFB_SER_EP_ID, 60 RIO_EFB_SER_EP_REC_ID, 61 -1, 62}; 63 64/** 65 * rio_get_device_id - Get the base/extended device id for a device 66 * @port: RIO master port 67 * @destid: Destination ID of device 68 * @hopcount: Hopcount to device 69 * 70 * Reads the base/extended device id from a device. Returns the 71 * 8/16-bit device ID. 72 */ 73static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount) 74{ 75 u32 result; 76 77 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result); 78 79 return RIO_GET_DID(port->sys_size, result); 80} 81 82/** 83 * rio_set_device_id - Set the base/extended device id for a device 84 * @port: RIO master port 85 * @destid: Destination ID of device 86 * @hopcount: Hopcount to device 87 * @did: Device ID value to be written 88 * 89 * Writes the base/extended device id from a device. 90 */ 91static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did) 92{ 93 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR, 94 RIO_SET_DID(port->sys_size, did)); 95} 96 97/** 98 * rio_local_set_device_id - Set the base/extended device id for a port 99 * @port: RIO master port 100 * @did: Device ID value to be written 101 * 102 * Writes the base/extended device id from a device. 103 */ 104static void rio_local_set_device_id(struct rio_mport *port, u16 did) 105{ 106 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size, 107 did)); 108} 109 110/** 111 * rio_clear_locks- Release all host locks and signal enumeration complete 112 * @port: Master port to issue transaction 113 * 114 * Marks the component tag CSR on each device with the enumeration 115 * complete flag. When complete, it then release the host locks on 116 * each device. Returns 0 on success or %-EINVAL on failure. 117 */ 118static int rio_clear_locks(struct rio_mport *port) 119{ 120 struct rio_dev *rdev; 121 u32 result; 122 int ret = 0; 123 124 /* Release host device id locks */ 125 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, 126 port->host_deviceid); 127 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); 128 if ((result & 0xffff) != 0xffff) { 129 printk(KERN_INFO 130 "RIO: badness when releasing host lock on master port, result %8.8x\n", 131 result); 132 ret = -EINVAL; 133 } 134 list_for_each_entry(rdev, &rio_devices, global_list) { 135 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR, 136 port->host_deviceid); 137 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result); 138 if ((result & 0xffff) != 0xffff) { 139 printk(KERN_INFO 140 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n", 141 rdev->vid, rdev->did); 142 ret = -EINVAL; 143 } 144 145 /* Mark device as discovered and enable master */ 146 rio_read_config_32(rdev, 147 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, 148 &result); 149 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER; 150 rio_write_config_32(rdev, 151 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR, 152 result); 153 } 154 155 return ret; 156} 157 158/** 159 * rio_enum_host- Set host lock and initialize host destination ID 160 * @port: Master port to issue transaction 161 * 162 * Sets the local host master port lock and destination ID register 163 * with the host device ID value. The host device ID value is provided 164 * by the platform. Returns %0 on success or %-1 on failure. 165 */ 166static int rio_enum_host(struct rio_mport *port) 167{ 168 u32 result; 169 170 /* Set master port host device id lock */ 171 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, 172 port->host_deviceid); 173 174 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); 175 if ((result & 0xffff) != port->host_deviceid) 176 return -1; 177 178 /* Set master port destid and init destid ctr */ 179 rio_local_set_device_id(port, port->host_deviceid); 180 181 if (next_destid == port->host_deviceid) 182 next_destid++; 183 184 return 0; 185} 186 187/** 188 * rio_device_has_destid- Test if a device contains a destination ID register 189 * @port: Master port to issue transaction 190 * @src_ops: RIO device source operations 191 * @dst_ops: RIO device destination operations 192 * 193 * Checks the provided @src_ops and @dst_ops for the necessary transaction 194 * capabilities that indicate whether or not a device will implement a 195 * destination ID register. Returns 1 if true or 0 if false. 196 */ 197static int rio_device_has_destid(struct rio_mport *port, int src_ops, 198 int dst_ops) 199{ 200 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; 201 202 return !!((src_ops | dst_ops) & mask); 203} 204 205/** 206 * rio_release_dev- Frees a RIO device struct 207 * @dev: LDM device associated with a RIO device struct 208 * 209 * Gets the RIO device struct associated a RIO device struct. 210 * The RIO device struct is freed. 211 */ 212static void rio_release_dev(struct device *dev) 213{ 214 struct rio_dev *rdev; 215 216 rdev = to_rio_dev(dev); 217 kfree(rdev); 218} 219 220/** 221 * rio_is_switch- Tests if a RIO device has switch capabilities 222 * @rdev: RIO device 223 * 224 * Gets the RIO device Processing Element Features register 225 * contents and tests for switch capabilities. Returns 1 if 226 * the device is a switch or 0 if it is not a switch. 227 * The RIO device struct is freed. 228 */ 229static int rio_is_switch(struct rio_dev *rdev) 230{ 231 if (rdev->pef & RIO_PEF_SWITCH) 232 return 1; 233 return 0; 234} 235 236/** 237 * rio_switch_init - Sets switch operations for a particular vendor switch 238 * @rdev: RIO device 239 * @do_enum: Enumeration/Discovery mode flag 240 * 241 * Searches the RIO switch ops table for known switch types. If the vid 242 * and did match a switch table entry, then call switch initialization 243 * routine to setup switch-specific routines. 244 */ 245static void rio_switch_init(struct rio_dev *rdev, int do_enum) 246{ 247 struct rio_switch_ops *cur = __start_rio_switch_ops; 248 struct rio_switch_ops *end = __end_rio_switch_ops; 249 250 while (cur < end) { 251 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) { 252 pr_debug("RIO: calling init routine for %s\n", 253 rio_name(rdev)); 254 cur->init_hook(rdev, do_enum); 255 break; 256 } 257 cur++; 258 } 259 260 if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) { 261 pr_debug("RIO: adding STD routing ops for %s\n", 262 rio_name(rdev)); 263 rdev->rswitch->add_entry = rio_std_route_add_entry; 264 rdev->rswitch->get_entry = rio_std_route_get_entry; 265 rdev->rswitch->clr_table = rio_std_route_clr_table; 266 } 267 268 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry) 269 printk(KERN_ERR "RIO: missing routing ops for %s\n", 270 rio_name(rdev)); 271} 272 273/** 274 * rio_add_device- Adds a RIO device to the device model 275 * @rdev: RIO device 276 * 277 * Adds the RIO device to the global device list and adds the RIO 278 * device to the RIO device list. Creates the generic sysfs nodes 279 * for an RIO device. 280 */ 281static int __devinit rio_add_device(struct rio_dev *rdev) 282{ 283 int err; 284 285 err = device_add(&rdev->dev); 286 if (err) 287 return err; 288 289 spin_lock(&rio_global_list_lock); 290 list_add_tail(&rdev->global_list, &rio_devices); 291 spin_unlock(&rio_global_list_lock); 292 293 rio_create_sysfs_dev_files(rdev); 294 295 return 0; 296} 297 298/** 299 * rio_enable_rx_tx_port - enable input reciever and output transmitter of 300 * given port 301 * @port: Master port associated with the RIO network 302 * @local: local=1 select local port otherwise a far device is reached 303 * @destid: Destination ID of the device to check host bit 304 * @hopcount: Number of hops to reach the target 305 * @port_num: Port (-number on switch) to enable on a far end device 306 * 307 * Returns 0 or 1 from on General Control Command and Status Register 308 * (EXT_PTR+0x3C) 309 */ 310inline int rio_enable_rx_tx_port(struct rio_mport *port, 311 int local, u16 destid, 312 u8 hopcount, u8 port_num) { 313#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS 314 u32 regval; 315 u32 ext_ftr_ptr; 316 317 /* 318 * enable rx input tx output port 319 */ 320 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = " 321 "%d, port_num = %d)\n", local, destid, hopcount, port_num); 322 323 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount); 324 325 if (local) { 326 rio_local_read_config_32(port, ext_ftr_ptr + 327 RIO_PORT_N_CTL_CSR(0), 328 ®val); 329 } else { 330 if (rio_mport_read_config_32(port, destid, hopcount, 331 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0) 332 return -EIO; 333 } 334 335 if (regval & RIO_PORT_N_CTL_P_TYP_SER) { 336 /* serial */ 337 regval = regval | RIO_PORT_N_CTL_EN_RX_SER 338 | RIO_PORT_N_CTL_EN_TX_SER; 339 } else { 340 /* parallel */ 341 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR 342 | RIO_PORT_N_CTL_EN_TX_PAR; 343 } 344 345 if (local) { 346 rio_local_write_config_32(port, ext_ftr_ptr + 347 RIO_PORT_N_CTL_CSR(0), regval); 348 } else { 349 if (rio_mport_write_config_32(port, destid, hopcount, 350 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0) 351 return -EIO; 352 } 353#endif 354 return 0; 355} 356 357/** 358 * rio_setup_device- Allocates and sets up a RIO device 359 * @net: RIO network 360 * @port: Master port to send transactions 361 * @destid: Current destination ID 362 * @hopcount: Current hopcount 363 * @do_enum: Enumeration/Discovery mode flag 364 * 365 * Allocates a RIO device and configures fields based on configuration 366 * space contents. If device has a destination ID register, a destination 367 * ID is either assigned in enumeration mode or read from configuration 368 * space in discovery mode. If the device has switch capabilities, then 369 * a switch is allocated and configured appropriately. Returns a pointer 370 * to a RIO device on success or NULL on failure. 371 * 372 */ 373static struct rio_dev __devinit *rio_setup_device(struct rio_net *net, 374 struct rio_mport *port, u16 destid, 375 u8 hopcount, int do_enum) 376{ 377 int ret = 0; 378 struct rio_dev *rdev; 379 struct rio_switch *rswitch = NULL; 380 int result, rdid; 381 size_t size; 382 u32 swpinfo = 0; 383 384 size = sizeof(struct rio_dev); 385 if (rio_mport_read_config_32(port, destid, hopcount, 386 RIO_PEF_CAR, &result)) 387 return NULL; 388 389 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) { 390 rio_mport_read_config_32(port, destid, hopcount, 391 RIO_SWP_INFO_CAR, &swpinfo); 392 if (result & RIO_PEF_SWITCH) { 393 size += (RIO_GET_TOTAL_PORTS(swpinfo) * 394 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch); 395 } 396 } 397 398 rdev = kzalloc(size, GFP_KERNEL); 399 if (!rdev) 400 return NULL; 401 402 rdev->net = net; 403 rdev->pef = result; 404 rdev->swpinfo = swpinfo; 405 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR, 406 &result); 407 rdev->did = result >> 16; 408 rdev->vid = result & 0xffff; 409 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR, 410 &rdev->device_rev); 411 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR, 412 &result); 413 rdev->asm_did = result >> 16; 414 rdev->asm_vid = result & 0xffff; 415 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR, 416 &result); 417 rdev->asm_rev = result >> 16; 418 if (rdev->pef & RIO_PEF_EXT_FEATURES) { 419 rdev->efptr = result & 0xffff; 420 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid, 421 hopcount); 422 423 rdev->em_efptr = rio_mport_get_feature(port, 0, destid, 424 hopcount, RIO_EFB_ERR_MGMNT); 425 } 426 427 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR, 428 &rdev->src_ops); 429 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR, 430 &rdev->dst_ops); 431 432 if (do_enum) { 433 /* Assign component tag to device */ 434 if (next_comptag >= 0x10000) { 435 pr_err("RIO: Component Tag Counter Overflow\n"); 436 goto cleanup; 437 } 438 rio_mport_write_config_32(port, destid, hopcount, 439 RIO_COMPONENT_TAG_CSR, next_comptag); 440 rdev->comp_tag = next_comptag++; 441 } 442 443 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { 444 if (do_enum) { 445 rio_set_device_id(port, destid, hopcount, next_destid); 446 rdev->destid = next_destid++; 447 if (next_destid == port->host_deviceid) 448 next_destid++; 449 } else 450 rdev->destid = rio_get_device_id(port, destid, hopcount); 451 452 rdev->hopcount = 0xff; 453 } else { 454 /* Switch device has an associated destID which 455 * will be adjusted later 456 */ 457 rdev->destid = destid; 458 rdev->hopcount = hopcount; 459 } 460 461 /* If a PE has both switch and other functions, show it as a switch */ 462 if (rio_is_switch(rdev)) { 463 rswitch = rdev->rswitch; 464 rswitch->switchid = next_switchid; 465 rswitch->port_ok = 0; 466 rswitch->route_table = kzalloc(sizeof(u8)* 467 RIO_MAX_ROUTE_ENTRIES(port->sys_size), 468 GFP_KERNEL); 469 if (!rswitch->route_table) 470 goto cleanup; 471 /* Initialize switch route table */ 472 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size); 473 rdid++) 474 rswitch->route_table[rdid] = RIO_INVALID_ROUTE; 475 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id, 476 rswitch->switchid); 477 rio_switch_init(rdev, do_enum); 478 479 if (do_enum && rswitch->clr_table) 480 rswitch->clr_table(port, destid, hopcount, 481 RIO_GLOBAL_TABLE); 482 483 list_add_tail(&rswitch->node, &rio_switches); 484 485 } else { 486 if (do_enum) 487 /*Enable Input Output Port (transmitter reviever)*/ 488 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0); 489 490 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id, 491 rdev->destid); 492 } 493 494 rdev->dev.bus = &rio_bus_type; 495 rdev->dev.parent = &rio_bus; 496 497 device_initialize(&rdev->dev); 498 rdev->dev.release = rio_release_dev; 499 rio_dev_get(rdev); 500 501 rdev->dma_mask = DMA_BIT_MASK(32); 502 rdev->dev.dma_mask = &rdev->dma_mask; 503 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 504 505 if ((rdev->pef & RIO_PEF_INB_DOORBELL) && 506 (rdev->dst_ops & RIO_DST_OPS_DOORBELL)) 507 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], 508 0, 0xffff); 509 510 ret = rio_add_device(rdev); 511 if (ret) 512 goto cleanup; 513 514 return rdev; 515 516cleanup: 517 if (rswitch->route_table) 518 kfree(rswitch->route_table); 519 520 kfree(rdev); 521 return NULL; 522} 523 524/** 525 * rio_sport_is_active- Tests if a switch port has an active connection. 526 * @port: Master port to send transaction 527 * @destid: Associated destination ID for switch 528 * @hopcount: Hopcount to reach switch 529 * @sport: Switch port number 530 * 531 * Reads the port error status CSR for a particular switch port to 532 * determine if the port has an active link. Returns 533 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is 534 * inactive. 535 */ 536static int 537rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport) 538{ 539 u32 result = 0; 540 u32 ext_ftr_ptr; 541 542 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0); 543 544 while (ext_ftr_ptr) { 545 rio_mport_read_config_32(port, destid, hopcount, 546 ext_ftr_ptr, &result); 547 result = RIO_GET_BLOCK_ID(result); 548 if ((result == RIO_EFB_SER_EP_FREE_ID) || 549 (result == RIO_EFB_SER_EP_FREE_ID_V13P) || 550 (result == RIO_EFB_SER_EP_FREC_ID)) 551 break; 552 553 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 554 ext_ftr_ptr); 555 } 556 557 if (ext_ftr_ptr) 558 rio_mport_read_config_32(port, destid, hopcount, 559 ext_ftr_ptr + 560 RIO_PORT_N_ERR_STS_CSR(sport), 561 &result); 562 563 return result & RIO_PORT_N_ERR_STS_PORT_OK; 564} 565 566/** 567 * rio_lock_device - Acquires host device lock for specified device 568 * @port: Master port to send transaction 569 * @destid: Destination ID for device/switch 570 * @hopcount: Hopcount to reach switch 571 * @wait_ms: Max wait time in msec (0 = no timeout) 572 * 573 * Attepts to acquire host device lock for specified device 574 * Returns 0 if device lock acquired or EINVAL if timeout expires. 575 */ 576static int 577rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms) 578{ 579 u32 result; 580 int tcnt = 0; 581 582 /* Attempt to acquire device lock */ 583 rio_mport_write_config_32(port, destid, hopcount, 584 RIO_HOST_DID_LOCK_CSR, port->host_deviceid); 585 rio_mport_read_config_32(port, destid, hopcount, 586 RIO_HOST_DID_LOCK_CSR, &result); 587 588 while (result != port->host_deviceid) { 589 if (wait_ms != 0 && tcnt == wait_ms) { 590 pr_debug("RIO: timeout when locking device %x:%x\n", 591 destid, hopcount); 592 return -EINVAL; 593 } 594 595 /* Delay a bit */ 596 mdelay(1); 597 tcnt++; 598 /* Try to acquire device lock again */ 599 rio_mport_write_config_32(port, destid, 600 hopcount, 601 RIO_HOST_DID_LOCK_CSR, 602 port->host_deviceid); 603 rio_mport_read_config_32(port, destid, 604 hopcount, 605 RIO_HOST_DID_LOCK_CSR, &result); 606 } 607 608 return 0; 609} 610 611/** 612 * rio_unlock_device - Releases host device lock for specified device 613 * @port: Master port to send transaction 614 * @destid: Destination ID for device/switch 615 * @hopcount: Hopcount to reach switch 616 * 617 * Returns 0 if device lock released or EINVAL if fails. 618 */ 619static int 620rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount) 621{ 622 u32 result; 623 624 /* Release device lock */ 625 rio_mport_write_config_32(port, destid, 626 hopcount, 627 RIO_HOST_DID_LOCK_CSR, 628 port->host_deviceid); 629 rio_mport_read_config_32(port, destid, hopcount, 630 RIO_HOST_DID_LOCK_CSR, &result); 631 if ((result & 0xffff) != 0xffff) { 632 pr_debug("RIO: badness when releasing device lock %x:%x\n", 633 destid, hopcount); 634 return -EINVAL; 635 } 636 637 return 0; 638} 639 640/** 641 * rio_route_add_entry- Add a route entry to a switch routing table 642 * @rdev: RIO device 643 * @table: Routing table ID 644 * @route_destid: Destination ID to be routed 645 * @route_port: Port number to be routed 646 * @lock: lock switch device flag 647 * 648 * Calls the switch specific add_entry() method to add a route entry 649 * on a switch. The route table can be specified using the @table 650 * argument if a switch has per port routing tables or the normal 651 * use is to specific all tables (or the global table) by passing 652 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL 653 * on failure. 654 */ 655static int 656rio_route_add_entry(struct rio_dev *rdev, 657 u16 table, u16 route_destid, u8 route_port, int lock) 658{ 659 int rc; 660 661 if (lock) { 662 rc = rio_lock_device(rdev->net->hport, rdev->destid, 663 rdev->hopcount, 1000); 664 if (rc) 665 return rc; 666 } 667 668 rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid, 669 rdev->hopcount, table, 670 route_destid, route_port); 671 if (lock) 672 rio_unlock_device(rdev->net->hport, rdev->destid, 673 rdev->hopcount); 674 675 return rc; 676} 677 678/** 679 * rio_route_get_entry- Read a route entry in a switch routing table 680 * @rdev: RIO device 681 * @table: Routing table ID 682 * @route_destid: Destination ID to be routed 683 * @route_port: Pointer to read port number into 684 * @lock: lock switch device flag 685 * 686 * Calls the switch specific get_entry() method to read a route entry 687 * in a switch. The route table can be specified using the @table 688 * argument if a switch has per port routing tables or the normal 689 * use is to specific all tables (or the global table) by passing 690 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL 691 * on failure. 692 */ 693static int 694rio_route_get_entry(struct rio_dev *rdev, u16 table, 695 u16 route_destid, u8 *route_port, int lock) 696{ 697 int rc; 698 699 if (lock) { 700 rc = rio_lock_device(rdev->net->hport, rdev->destid, 701 rdev->hopcount, 1000); 702 if (rc) 703 return rc; 704 } 705 706 rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid, 707 rdev->hopcount, table, 708 route_destid, route_port); 709 if (lock) 710 rio_unlock_device(rdev->net->hport, rdev->destid, 711 rdev->hopcount); 712 713 return rc; 714} 715 716/** 717 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device 718 * @port: Master port to send transaction 719 * @hopcount: Number of hops to the device 720 * 721 * Used during enumeration to read the Host Device ID Lock CSR on a 722 * RIO device. Returns the value of the lock register. 723 */ 724static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) 725{ 726 u32 result; 727 728 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount, 729 RIO_HOST_DID_LOCK_CSR, &result); 730 731 return (u16) (result & 0xffff); 732} 733 734/** 735 * rio_enum_peer- Recursively enumerate a RIO network through a master port 736 * @net: RIO network being enumerated 737 * @port: Master port to send transactions 738 * @hopcount: Number of hops into the network 739 * @prev: Previous RIO device connected to the enumerated one 740 * @prev_port: Port on previous RIO device 741 * 742 * Recursively enumerates a RIO network. Transactions are sent via the 743 * master port passed in @port. 744 */ 745static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port, 746 u8 hopcount, struct rio_dev *prev, int prev_port) 747{ 748 int port_num; 749 int cur_destid; 750 int sw_destid; 751 int sw_inport; 752 struct rio_dev *rdev; 753 u16 destid; 754 u32 regval; 755 int tmp; 756 757 if (rio_mport_chk_dev_access(port, 758 RIO_ANY_DESTID(port->sys_size), hopcount)) { 759 pr_debug("RIO: device access check failed\n"); 760 return -1; 761 } 762 763 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { 764 pr_debug("RIO: PE already discovered by this host\n"); 765 /* 766 * Already discovered by this host. Add it as another 767 * link to the existing device. 768 */ 769 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), 770 hopcount, RIO_COMPONENT_TAG_CSR, ®val); 771 772 if (regval) { 773 rdev = rio_get_comptag((regval & 0xffff), NULL); 774 775 if (rdev && prev && rio_is_switch(prev)) { 776 pr_debug("RIO: redundant path to %s\n", 777 rio_name(rdev)); 778 prev->rswitch->nextdev[prev_port] = rdev; 779 } 780 } 781 782 return 0; 783 } 784 785 /* Attempt to acquire device lock */ 786 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), 787 hopcount, 788 RIO_HOST_DID_LOCK_CSR, port->host_deviceid); 789 while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) 790 < port->host_deviceid) { 791 /* Delay a bit */ 792 mdelay(1); 793 /* Attempt to acquire device lock again */ 794 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size), 795 hopcount, 796 RIO_HOST_DID_LOCK_CSR, 797 port->host_deviceid); 798 } 799 800 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { 801 pr_debug( 802 "RIO: PE locked by a higher priority host...retreating\n"); 803 return -1; 804 } 805 806 /* Setup new RIO device */ 807 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size), 808 hopcount, 1); 809 if (rdev) { 810 /* Add device to the global and bus/net specific list. */ 811 list_add_tail(&rdev->net_list, &net->devices); 812 rdev->prev = prev; 813 if (prev && rio_is_switch(prev)) 814 prev->rswitch->nextdev[prev_port] = rdev; 815 } else 816 return -1; 817 818 if (rio_is_switch(rdev)) { 819 next_switchid++; 820 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo); 821 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, 822 port->host_deviceid, sw_inport, 0); 823 rdev->rswitch->route_table[port->host_deviceid] = sw_inport; 824 825 for (destid = 0; destid < next_destid; destid++) { 826 if (destid == port->host_deviceid) 827 continue; 828 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, 829 destid, sw_inport, 0); 830 rdev->rswitch->route_table[destid] = sw_inport; 831 } 832 833 pr_debug( 834 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", 835 rio_name(rdev), rdev->vid, rdev->did, 836 RIO_GET_TOTAL_PORTS(rdev->swpinfo)); 837 sw_destid = next_destid; 838 for (port_num = 0; 839 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); 840 port_num++) { 841 /*Enable Input Output Port (transmitter reviever)*/ 842 rio_enable_rx_tx_port(port, 0, 843 RIO_ANY_DESTID(port->sys_size), 844 hopcount, port_num); 845 846 if (sw_inport == port_num) { 847 rdev->rswitch->port_ok |= (1 << port_num); 848 continue; 849 } 850 851 cur_destid = next_destid; 852 853 if (rio_sport_is_active 854 (port, RIO_ANY_DESTID(port->sys_size), hopcount, 855 port_num)) { 856 pr_debug( 857 "RIO: scanning device on port %d\n", 858 port_num); 859 rdev->rswitch->port_ok |= (1 << port_num); 860 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE, 861 RIO_ANY_DESTID(port->sys_size), 862 port_num, 0); 863 864 if (rio_enum_peer(net, port, hopcount + 1, 865 rdev, port_num) < 0) 866 return -1; 867 868 /* Update routing tables */ 869 if (next_destid > cur_destid) { 870 for (destid = cur_destid; 871 destid < next_destid; destid++) { 872 if (destid == port->host_deviceid) 873 continue; 874 rio_route_add_entry(rdev, 875 RIO_GLOBAL_TABLE, 876 destid, 877 port_num, 878 0); 879 rdev->rswitch-> 880 route_table[destid] = 881 port_num; 882 } 883 } 884 } else { 885 /* If switch supports Error Management, 886 * set PORT_LOCKOUT bit for unused port 887 */ 888 if (rdev->em_efptr) 889 rio_set_port_lockout(rdev, port_num, 1); 890 891 rdev->rswitch->port_ok &= ~(1 << port_num); 892 } 893 } 894 895 /* Direct Port-write messages to the enumeratiing host */ 896 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) && 897 (rdev->em_efptr)) { 898 rio_write_config_32(rdev, 899 rdev->em_efptr + RIO_EM_PW_TGT_DEVID, 900 (port->host_deviceid << 16) | 901 (port->sys_size << 15)); 902 } 903 904 rio_init_em(rdev); 905 906 /* Check for empty switch */ 907 if (next_destid == sw_destid) { 908 next_destid++; 909 if (next_destid == port->host_deviceid) 910 next_destid++; 911 } 912 913 rdev->destid = sw_destid; 914 } else 915 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", 916 rio_name(rdev), rdev->vid, rdev->did); 917 918 return 0; 919} 920 921/** 922 * rio_enum_complete- Tests if enumeration of a network is complete 923 * @port: Master port to send transaction 924 * 925 * Tests the Component Tag CSR for non-zero value (enumeration 926 * complete flag). Return %1 if enumeration is complete or %0 if 927 * enumeration is incomplete. 928 */ 929static int rio_enum_complete(struct rio_mport *port) 930{ 931 u32 regval; 932 933 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR, 934 ®val); 935 return (regval & RIO_PORT_GEN_MASTER) ? 1 : 0; 936} 937 938/** 939 * rio_disc_peer- Recursively discovers a RIO network through a master port 940 * @net: RIO network being discovered 941 * @port: Master port to send transactions 942 * @destid: Current destination ID in network 943 * @hopcount: Number of hops into the network 944 * 945 * Recursively discovers a RIO network. Transactions are sent via the 946 * master port passed in @port. 947 */ 948static int __devinit 949rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, 950 u8 hopcount) 951{ 952 u8 port_num, route_port; 953 struct rio_dev *rdev; 954 u16 ndestid; 955 956 /* Setup new RIO device */ 957 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { 958 /* Add device to the global and bus/net specific list. */ 959 list_add_tail(&rdev->net_list, &net->devices); 960 } else 961 return -1; 962 963 if (rio_is_switch(rdev)) { 964 next_switchid++; 965 966 /* Associated destid is how we accessed this switch */ 967 rdev->destid = destid; 968 969 pr_debug( 970 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", 971 rio_name(rdev), rdev->vid, rdev->did, 972 RIO_GET_TOTAL_PORTS(rdev->swpinfo)); 973 for (port_num = 0; 974 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo); 975 port_num++) { 976 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num) 977 continue; 978 979 if (rio_sport_is_active 980 (port, destid, hopcount, port_num)) { 981 pr_debug( 982 "RIO: scanning device on port %d\n", 983 port_num); 984 985 rio_lock_device(port, destid, hopcount, 1000); 986 987 for (ndestid = 0; 988 ndestid < RIO_ANY_DESTID(port->sys_size); 989 ndestid++) { 990 rio_route_get_entry(rdev, 991 RIO_GLOBAL_TABLE, 992 ndestid, 993 &route_port, 0); 994 if (route_port == port_num) 995 break; 996 } 997 998 if (ndestid == RIO_ANY_DESTID(port->sys_size)) 999 continue; 1000 rio_unlock_device(port, destid, hopcount); 1001 if (rio_disc_peer 1002 (net, port, ndestid, hopcount + 1) < 0) 1003 return -1; 1004 } 1005 } 1006 } else 1007 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", 1008 rio_name(rdev), rdev->vid, rdev->did); 1009 1010 return 0; 1011} 1012 1013/** 1014 * rio_mport_is_active- Tests if master port link is active 1015 * @port: Master port to test 1016 * 1017 * Reads the port error status CSR for the master port to 1018 * determine if the port has an active link. Returns 1019 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active 1020 * or %0 if it is inactive. 1021 */ 1022static int rio_mport_is_active(struct rio_mport *port) 1023{ 1024 u32 result = 0; 1025 u32 ext_ftr_ptr; 1026 int *entry = rio_mport_phys_table; 1027 1028 do { 1029 if ((ext_ftr_ptr = 1030 rio_mport_get_feature(port, 1, 0, 0, *entry))) 1031 break; 1032 } while (*++entry >= 0); 1033 1034 if (ext_ftr_ptr) 1035 rio_local_read_config_32(port, 1036 ext_ftr_ptr + 1037 RIO_PORT_N_ERR_STS_CSR(port->index), 1038 &result); 1039 1040 return result & RIO_PORT_N_ERR_STS_PORT_OK; 1041} 1042 1043/** 1044 * rio_alloc_net- Allocate and configure a new RIO network 1045 * @port: Master port associated with the RIO network 1046 * 1047 * Allocates a RIO network structure, initializes per-network 1048 * list heads, and adds the associated master port to the 1049 * network list of associated master ports. Returns a 1050 * RIO network pointer on success or %NULL on failure. 1051 */ 1052static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port) 1053{ 1054 struct rio_net *net; 1055 1056 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL); 1057 if (net) { 1058 INIT_LIST_HEAD(&net->node); 1059 INIT_LIST_HEAD(&net->devices); 1060 INIT_LIST_HEAD(&net->mports); 1061 list_add_tail(&port->nnode, &net->mports); 1062 net->hport = port; 1063 net->id = next_net++; 1064 } 1065 return net; 1066} 1067 1068/** 1069 * rio_update_route_tables- Updates route tables in switches 1070 * @port: Master port associated with the RIO network 1071 * 1072 * For each enumerated device, ensure that each switch in a system 1073 * has correct routing entries. Add routes for devices that where 1074 * unknown dirung the first enumeration pass through the switch. 1075 */ 1076static void rio_update_route_tables(struct rio_mport *port) 1077{ 1078 struct rio_dev *rdev, *swrdev; 1079 struct rio_switch *rswitch; 1080 u8 sport; 1081 u16 destid; 1082 1083 list_for_each_entry(rdev, &rio_devices, global_list) { 1084 1085 destid = rdev->destid; 1086 1087 list_for_each_entry(rswitch, &rio_switches, node) { 1088 1089 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch)) 1090 continue; 1091 1092 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) { 1093 swrdev = sw_to_rio_dev(rswitch); 1094 1095 /* Skip if destid ends in empty switch*/ 1096 if (swrdev->destid == destid) 1097 continue; 1098 1099 sport = RIO_GET_PORT_NUM(swrdev->swpinfo); 1100 1101 if (rswitch->add_entry) { 1102 rio_route_add_entry(swrdev, 1103 RIO_GLOBAL_TABLE, destid, 1104 sport, 0); 1105 rswitch->route_table[destid] = sport; 1106 } 1107 } 1108 } 1109 } 1110} 1111 1112/** 1113 * rio_init_em - Initializes RIO Error Management (for switches) 1114 * @rdev: RIO device 1115 * 1116 * For each enumerated switch, call device-specific error management 1117 * initialization routine (if supplied by the switch driver). 1118 */ 1119static void rio_init_em(struct rio_dev *rdev) 1120{ 1121 if (rio_is_switch(rdev) && (rdev->em_efptr) && 1122 (rdev->rswitch->em_init)) { 1123 rdev->rswitch->em_init(rdev); 1124 } 1125} 1126 1127/** 1128 * rio_pw_enable - Enables/disables port-write handling by a master port 1129 * @port: Master port associated with port-write handling 1130 * @enable: 1=enable, 0=disable 1131 */ 1132static void rio_pw_enable(struct rio_mport *port, int enable) 1133{ 1134 if (port->ops->pwenable) 1135 port->ops->pwenable(port, enable); 1136} 1137 1138/** 1139 * rio_enum_mport- Start enumeration through a master port 1140 * @mport: Master port to send transactions 1141 * 1142 * Starts the enumeration process. If somebody has enumerated our 1143 * master port device, then give up. If not and we have an active 1144 * link, then start recursive peer enumeration. Returns %0 if 1145 * enumeration succeeds or %-EBUSY if enumeration fails. 1146 */ 1147int __devinit rio_enum_mport(struct rio_mport *mport) 1148{ 1149 struct rio_net *net = NULL; 1150 int rc = 0; 1151 1152 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, 1153 mport->name); 1154 /* If somebody else enumerated our master port device, bail. */ 1155 if (rio_enum_host(mport) < 0) { 1156 printk(KERN_INFO 1157 "RIO: master port %d device has been enumerated by a remote host\n", 1158 mport->id); 1159 rc = -EBUSY; 1160 goto out; 1161 } 1162 1163 /* If master port has an active link, allocate net and enum peers */ 1164 if (rio_mport_is_active(mport)) { 1165 if (!(net = rio_alloc_net(mport))) { 1166 printk(KERN_ERR "RIO: failed to allocate new net\n"); 1167 rc = -ENOMEM; 1168 goto out; 1169 } 1170 1171 /* Enable Input Output Port (transmitter reviever) */ 1172 rio_enable_rx_tx_port(mport, 1, 0, 0, 0); 1173 1174 /* Set component tag for host */ 1175 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR, 1176 next_comptag++); 1177 1178 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) { 1179 /* A higher priority host won enumeration, bail. */ 1180 printk(KERN_INFO 1181 "RIO: master port %d device has lost enumeration to a remote host\n", 1182 mport->id); 1183 rio_clear_locks(mport); 1184 rc = -EBUSY; 1185 goto out; 1186 } 1187 rio_update_route_tables(mport); 1188 rio_clear_locks(mport); 1189 rio_pw_enable(mport, 1); 1190 } else { 1191 printk(KERN_INFO "RIO: master port %d link inactive\n", 1192 mport->id); 1193 rc = -EINVAL; 1194 } 1195 1196 out: 1197 return rc; 1198} 1199 1200/** 1201 * rio_build_route_tables- Generate route tables from switch route entries 1202 * 1203 * For each switch device, generate a route table by copying existing 1204 * route entries from the switch. 1205 */ 1206static void rio_build_route_tables(void) 1207{ 1208 struct rio_dev *rdev; 1209 int i; 1210 u8 sport; 1211 1212 list_for_each_entry(rdev, &rio_devices, global_list) 1213 if (rio_is_switch(rdev)) { 1214 rio_lock_device(rdev->net->hport, rdev->destid, 1215 rdev->hopcount, 1000); 1216 for (i = 0; 1217 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size); 1218 i++) { 1219 if (rio_route_get_entry(rdev, 1220 RIO_GLOBAL_TABLE, i, &sport, 0) < 0) 1221 continue; 1222 rdev->rswitch->route_table[i] = sport; 1223 } 1224 1225 rio_unlock_device(rdev->net->hport, 1226 rdev->destid, 1227 rdev->hopcount); 1228 } 1229} 1230 1231/** 1232 * rio_enum_timeout- Signal that enumeration timed out 1233 * @data: Address of timeout flag. 1234 * 1235 * When the enumeration complete timer expires, set a flag that 1236 * signals to the discovery process that enumeration did not 1237 * complete in a sane amount of time. 1238 */ 1239static void rio_enum_timeout(unsigned long data) 1240{ 1241 /* Enumeration timed out, set flag */ 1242 *(int *)data = 1; 1243} 1244 1245/** 1246 * rio_disc_mport- Start discovery through a master port 1247 * @mport: Master port to send transactions 1248 * 1249 * Starts the discovery process. If we have an active link, 1250 * then wait for the signal that enumeration is complete. 1251 * When enumeration completion is signaled, start recursive 1252 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY 1253 * on failure. 1254 */ 1255int __devinit rio_disc_mport(struct rio_mport *mport) 1256{ 1257 struct rio_net *net = NULL; 1258 int enum_timeout_flag = 0; 1259 1260 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, 1261 mport->name); 1262 1263 /* If master port has an active link, allocate net and discover peers */ 1264 if (rio_mport_is_active(mport)) { 1265 if (!(net = rio_alloc_net(mport))) { 1266 printk(KERN_ERR "RIO: Failed to allocate new net\n"); 1267 goto bail; 1268 } 1269 1270 pr_debug("RIO: wait for enumeration complete..."); 1271 1272 rio_enum_timer.expires = 1273 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; 1274 rio_enum_timer.data = (unsigned long)&enum_timeout_flag; 1275 add_timer(&rio_enum_timer); 1276 while (!rio_enum_complete(mport)) { 1277 mdelay(1); 1278 if (enum_timeout_flag) { 1279 del_timer_sync(&rio_enum_timer); 1280 goto timeout; 1281 } 1282 } 1283 del_timer_sync(&rio_enum_timer); 1284 1285 pr_debug("done\n"); 1286 1287 /* Read DestID assigned by enumerator */ 1288 rio_local_read_config_32(mport, RIO_DID_CSR, 1289 &mport->host_deviceid); 1290 mport->host_deviceid = RIO_GET_DID(mport->sys_size, 1291 mport->host_deviceid); 1292 1293 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size), 1294 0) < 0) { 1295 printk(KERN_INFO 1296 "RIO: master port %d device has failed discovery\n", 1297 mport->id); 1298 goto bail; 1299 } 1300 1301 rio_build_route_tables(); 1302 } 1303 1304 return 0; 1305 1306 timeout: 1307 pr_debug("timeout\n"); 1308 bail: 1309 return -EBUSY; 1310} 1311