1 /* 2 * RapidIO interconnect services 3 * (RapidIO Interconnect Specification, http://www.rapidio.org) 4 * 5 * Copyright 2005 MontaVista Software, Inc. 6 * Matt Porter <mporter@kernel.crashing.org> 7 * 8 * Copyright 2009 Integrated Device Technology, Inc. 9 * Alex Bounine <alexandre.bounine@idt.com> 10 * - Added Port-Write/Error Management initialization and handling 11 * 12 * This program is free software; you can redistribute it and/or modify it 13 * under the terms of the GNU General Public License as published by the 14 * Free Software Foundation; either version 2 of the License, or (at your 15 * option) any later version. 16 */ 17 18 #include <linux/types.h> 19 #include <linux/kernel.h> 20 21 #include <linux/delay.h> 22 #include <linux/init.h> 23 #include <linux/rio.h> 24 #include <linux/rio_drv.h> 25 #include <linux/rio_ids.h> 26 #include <linux/rio_regs.h> 27 #include <linux/module.h> 28 #include <linux/spinlock.h> 29 #include <linux/slab.h> 30 #include <linux/interrupt.h> 31 32 #include "rio.h" 33 34 static LIST_HEAD(rio_mports); 35 36 /** 37 * rio_local_get_device_id - Get the base/extended device id for a port 38 * @port: RIO master port from which to get the deviceid 39 * 40 * Reads the base/extended device id from the local device 41 * implementing the master port. Returns the 8/16-bit device 42 * id. 43 */ 44 u16 rio_local_get_device_id(struct rio_mport *port) 45 { 46 u32 result; 47 48 rio_local_read_config_32(port, RIO_DID_CSR, &result); 49 50 return (RIO_GET_DID(port->sys_size, result)); 51 } 52 53 /** 54 * rio_request_inb_mbox - request inbound mailbox service 55 * @mport: RIO master port from which to allocate the mailbox resource 56 * @dev_id: Device specific pointer to pass on event 57 * @mbox: Mailbox number to claim 58 * @entries: Number of entries in inbound mailbox queue 59 * @minb: Callback to execute when inbound message is received 60 * 61 * Requests ownership of an inbound mailbox resource and binds 62 * a callback function to the resource. Returns %0 on success. 63 */ 64 int rio_request_inb_mbox(struct rio_mport *mport, 65 void *dev_id, 66 int mbox, 67 int entries, 68 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox, 69 int slot)) 70 { 71 int rc = 0; 72 73 struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL); 74 75 if (res) { 76 rio_init_mbox_res(res, mbox, mbox); 77 78 /* Make sure this mailbox isn't in use */ 79 if ((rc = 80 request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE], 81 res)) < 0) { 82 kfree(res); 83 goto out; 84 } 85 86 mport->inb_msg[mbox].res = res; 87 88 /* Hook the inbound message callback */ 89 mport->inb_msg[mbox].mcback = minb; 90 91 rc = rio_open_inb_mbox(mport, dev_id, mbox, entries); 92 } else 93 rc = -ENOMEM; 94 95 out: 96 return rc; 97 } 98 99 /** 100 * rio_release_inb_mbox - release inbound mailbox message service 101 * @mport: RIO master port from which to release the mailbox resource 102 * @mbox: Mailbox number to release 103 * 104 * Releases ownership of an inbound mailbox resource. Returns 0 105 * if the request has been satisfied. 106 */ 107 int rio_release_inb_mbox(struct rio_mport *mport, int mbox) 108 { 109 rio_close_inb_mbox(mport, mbox); 110 111 /* Release the mailbox resource */ 112 return release_resource(mport->inb_msg[mbox].res); 113 } 114 115 /** 116 * rio_request_outb_mbox - request outbound mailbox service 117 * @mport: RIO master port from which to allocate the mailbox resource 118 * @dev_id: Device specific pointer to pass on event 119 * @mbox: Mailbox number to claim 120 * @entries: Number of entries in outbound mailbox queue 121 * @moutb: Callback to execute when outbound message is sent 122 * 123 * Requests ownership of an outbound mailbox resource and binds 124 * a callback function to the resource. Returns 0 on success. 125 */ 126 int rio_request_outb_mbox(struct rio_mport *mport, 127 void *dev_id, 128 int mbox, 129 int entries, 130 void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot)) 131 { 132 int rc = 0; 133 134 struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL); 135 136 if (res) { 137 rio_init_mbox_res(res, mbox, mbox); 138 139 /* Make sure this outbound mailbox isn't in use */ 140 if ((rc = 141 request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE], 142 res)) < 0) { 143 kfree(res); 144 goto out; 145 } 146 147 mport->outb_msg[mbox].res = res; 148 149 /* Hook the inbound message callback */ 150 mport->outb_msg[mbox].mcback = moutb; 151 152 rc = rio_open_outb_mbox(mport, dev_id, mbox, entries); 153 } else 154 rc = -ENOMEM; 155 156 out: 157 return rc; 158 } 159 160 /** 161 * rio_release_outb_mbox - release outbound mailbox message service 162 * @mport: RIO master port from which to release the mailbox resource 163 * @mbox: Mailbox number to release 164 * 165 * Releases ownership of an inbound mailbox resource. Returns 0 166 * if the request has been satisfied. 167 */ 168 int rio_release_outb_mbox(struct rio_mport *mport, int mbox) 169 { 170 rio_close_outb_mbox(mport, mbox); 171 172 /* Release the mailbox resource */ 173 return release_resource(mport->outb_msg[mbox].res); 174 } 175 176 /** 177 * rio_setup_inb_dbell - bind inbound doorbell callback 178 * @mport: RIO master port to bind the doorbell callback 179 * @dev_id: Device specific pointer to pass on event 180 * @res: Doorbell message resource 181 * @dinb: Callback to execute when doorbell is received 182 * 183 * Adds a doorbell resource/callback pair into a port's 184 * doorbell event list. Returns 0 if the request has been 185 * satisfied. 186 */ 187 static int 188 rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res, 189 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst, 190 u16 info)) 191 { 192 int rc = 0; 193 struct rio_dbell *dbell; 194 195 if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) { 196 rc = -ENOMEM; 197 goto out; 198 } 199 200 dbell->res = res; 201 dbell->dinb = dinb; 202 dbell->dev_id = dev_id; 203 204 list_add_tail(&dbell->node, &mport->dbells); 205 206 out: 207 return rc; 208 } 209 210 /** 211 * rio_request_inb_dbell - request inbound doorbell message service 212 * @mport: RIO master port from which to allocate the doorbell resource 213 * @dev_id: Device specific pointer to pass on event 214 * @start: Doorbell info range start 215 * @end: Doorbell info range end 216 * @dinb: Callback to execute when doorbell is received 217 * 218 * Requests ownership of an inbound doorbell resource and binds 219 * a callback function to the resource. Returns 0 if the request 220 * has been satisfied. 221 */ 222 int rio_request_inb_dbell(struct rio_mport *mport, 223 void *dev_id, 224 u16 start, 225 u16 end, 226 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, 227 u16 dst, u16 info)) 228 { 229 int rc = 0; 230 231 struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL); 232 233 if (res) { 234 rio_init_dbell_res(res, start, end); 235 236 /* Make sure these doorbells aren't in use */ 237 if ((rc = 238 request_resource(&mport->riores[RIO_DOORBELL_RESOURCE], 239 res)) < 0) { 240 kfree(res); 241 goto out; 242 } 243 244 /* Hook the doorbell callback */ 245 rc = rio_setup_inb_dbell(mport, dev_id, res, dinb); 246 } else 247 rc = -ENOMEM; 248 249 out: 250 return rc; 251 } 252 253 /** 254 * rio_release_inb_dbell - release inbound doorbell message service 255 * @mport: RIO master port from which to release the doorbell resource 256 * @start: Doorbell info range start 257 * @end: Doorbell info range end 258 * 259 * Releases ownership of an inbound doorbell resource and removes 260 * callback from the doorbell event list. Returns 0 if the request 261 * has been satisfied. 262 */ 263 int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end) 264 { 265 int rc = 0, found = 0; 266 struct rio_dbell *dbell; 267 268 list_for_each_entry(dbell, &mport->dbells, node) { 269 if ((dbell->res->start == start) && (dbell->res->end == end)) { 270 found = 1; 271 break; 272 } 273 } 274 275 /* If we can't find an exact match, fail */ 276 if (!found) { 277 rc = -EINVAL; 278 goto out; 279 } 280 281 /* Delete from list */ 282 list_del(&dbell->node); 283 284 /* Release the doorbell resource */ 285 rc = release_resource(dbell->res); 286 287 /* Free the doorbell event */ 288 kfree(dbell); 289 290 out: 291 return rc; 292 } 293 294 /** 295 * rio_request_outb_dbell - request outbound doorbell message range 296 * @rdev: RIO device from which to allocate the doorbell resource 297 * @start: Doorbell message range start 298 * @end: Doorbell message range end 299 * 300 * Requests ownership of a doorbell message range. Returns a resource 301 * if the request has been satisfied or %NULL on failure. 302 */ 303 struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start, 304 u16 end) 305 { 306 struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL); 307 308 if (res) { 309 rio_init_dbell_res(res, start, end); 310 311 /* Make sure these doorbells aren't in use */ 312 if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res) 313 < 0) { 314 kfree(res); 315 res = NULL; 316 } 317 } 318 319 return res; 320 } 321 322 /** 323 * rio_release_outb_dbell - release outbound doorbell message range 324 * @rdev: RIO device from which to release the doorbell resource 325 * @res: Doorbell resource to be freed 326 * 327 * Releases ownership of a doorbell message range. Returns 0 if the 328 * request has been satisfied. 329 */ 330 int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res) 331 { 332 int rc = release_resource(res); 333 334 kfree(res); 335 336 return rc; 337 } 338 339 /** 340 * rio_request_inb_pwrite - request inbound port-write message service 341 * @rdev: RIO device to which register inbound port-write callback routine 342 * @pwcback: Callback routine to execute when port-write is received 343 * 344 * Binds a port-write callback function to the RapidIO device. 345 * Returns 0 if the request has been satisfied. 346 */ 347 int rio_request_inb_pwrite(struct rio_dev *rdev, 348 int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step)) 349 { 350 int rc = 0; 351 352 spin_lock(&rio_global_list_lock); 353 if (rdev->pwcback != NULL) 354 rc = -ENOMEM; 355 else 356 rdev->pwcback = pwcback; 357 358 spin_unlock(&rio_global_list_lock); 359 return rc; 360 } 361 EXPORT_SYMBOL_GPL(rio_request_inb_pwrite); 362 363 /** 364 * rio_release_inb_pwrite - release inbound port-write message service 365 * @rdev: RIO device which registered for inbound port-write callback 366 * 367 * Removes callback from the rio_dev structure. Returns 0 if the request 368 * has been satisfied. 369 */ 370 int rio_release_inb_pwrite(struct rio_dev *rdev) 371 { 372 int rc = -ENOMEM; 373 374 spin_lock(&rio_global_list_lock); 375 if (rdev->pwcback) { 376 rdev->pwcback = NULL; 377 rc = 0; 378 } 379 380 spin_unlock(&rio_global_list_lock); 381 return rc; 382 } 383 EXPORT_SYMBOL_GPL(rio_release_inb_pwrite); 384 385 /** 386 * rio_mport_get_physefb - Helper function that returns register offset 387 * for Physical Layer Extended Features Block. 388 * @port: Master port to issue transaction 389 * @local: Indicate a local master port or remote device access 390 * @destid: Destination ID of the device 391 * @hopcount: Number of switch hops to the device 392 */ 393 u32 394 rio_mport_get_physefb(struct rio_mport *port, int local, 395 u16 destid, u8 hopcount) 396 { 397 u32 ext_ftr_ptr; 398 u32 ftr_header; 399 400 ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0); 401 402 while (ext_ftr_ptr) { 403 if (local) 404 rio_local_read_config_32(port, ext_ftr_ptr, 405 &ftr_header); 406 else 407 rio_mport_read_config_32(port, destid, hopcount, 408 ext_ftr_ptr, &ftr_header); 409 410 ftr_header = RIO_GET_BLOCK_ID(ftr_header); 411 switch (ftr_header) { 412 413 case RIO_EFB_SER_EP_ID_V13P: 414 case RIO_EFB_SER_EP_REC_ID_V13P: 415 case RIO_EFB_SER_EP_FREE_ID_V13P: 416 case RIO_EFB_SER_EP_ID: 417 case RIO_EFB_SER_EP_REC_ID: 418 case RIO_EFB_SER_EP_FREE_ID: 419 case RIO_EFB_SER_EP_FREC_ID: 420 421 return ext_ftr_ptr; 422 423 default: 424 break; 425 } 426 427 ext_ftr_ptr = rio_mport_get_efb(port, local, destid, 428 hopcount, ext_ftr_ptr); 429 } 430 431 return ext_ftr_ptr; 432 } 433 434 /** 435 * rio_get_comptag - Begin or continue searching for a RIO device by component tag 436 * @comp_tag: RIO component tag to match 437 * @from: Previous RIO device found in search, or %NULL for new search 438 * 439 * Iterates through the list of known RIO devices. If a RIO device is 440 * found with a matching @comp_tag, a pointer to its device 441 * structure is returned. Otherwise, %NULL is returned. A new search 442 * is initiated by passing %NULL to the @from argument. Otherwise, if 443 * @from is not %NULL, searches continue from next device on the global 444 * list. 445 */ 446 struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from) 447 { 448 struct list_head *n; 449 struct rio_dev *rdev; 450 451 spin_lock(&rio_global_list_lock); 452 n = from ? from->global_list.next : rio_devices.next; 453 454 while (n && (n != &rio_devices)) { 455 rdev = rio_dev_g(n); 456 if (rdev->comp_tag == comp_tag) 457 goto exit; 458 n = n->next; 459 } 460 rdev = NULL; 461 exit: 462 spin_unlock(&rio_global_list_lock); 463 return rdev; 464 } 465 466 /** 467 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port. 468 * @rdev: Pointer to RIO device control structure 469 * @pnum: Switch port number to set LOCKOUT bit 470 * @lock: Operation : set (=1) or clear (=0) 471 */ 472 int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock) 473 { 474 u8 hopcount = 0xff; 475 u16 destid = rdev->destid; 476 u32 regval; 477 478 if (rdev->rswitch) { 479 destid = rdev->rswitch->destid; 480 hopcount = rdev->rswitch->hopcount; 481 } 482 483 rio_mport_read_config_32(rdev->net->hport, destid, hopcount, 484 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum), 485 ®val); 486 if (lock) 487 regval |= RIO_PORT_N_CTL_LOCKOUT; 488 else 489 regval &= ~RIO_PORT_N_CTL_LOCKOUT; 490 491 rio_mport_write_config_32(rdev->net->hport, destid, hopcount, 492 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum), 493 regval); 494 return 0; 495 } 496 497 /** 498 * rio_chk_dev_route - Validate route to the specified device. 499 * @rdev: RIO device failed to respond 500 * @nrdev: Last active device on the route to rdev 501 * @npnum: nrdev's port number on the route to rdev 502 * 503 * Follows a route to the specified RIO device to determine the last available 504 * device (and corresponding RIO port) on the route. 505 */ 506 static int 507 rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum) 508 { 509 u32 result; 510 int p_port, dstid, rc = -EIO; 511 struct rio_dev *prev = NULL; 512 513 /* Find switch with failed RIO link */ 514 while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) { 515 if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) { 516 prev = rdev->prev; 517 break; 518 } 519 rdev = rdev->prev; 520 } 521 522 if (prev == NULL) 523 goto err_out; 524 525 dstid = (rdev->pef & RIO_PEF_SWITCH) ? 526 rdev->rswitch->destid : rdev->destid; 527 p_port = prev->rswitch->route_table[dstid]; 528 529 if (p_port != RIO_INVALID_ROUTE) { 530 pr_debug("RIO: link failed on [%s]-P%d\n", 531 rio_name(prev), p_port); 532 *nrdev = prev; 533 *npnum = p_port; 534 rc = 0; 535 } else 536 pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev)); 537 err_out: 538 return rc; 539 } 540 541 /** 542 * rio_mport_chk_dev_access - Validate access to the specified device. 543 * @mport: Master port to send transactions 544 * @destid: Device destination ID in network 545 * @hopcount: Number of hops into the network 546 */ 547 int 548 rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount) 549 { 550 int i = 0; 551 u32 tmp; 552 553 while (rio_mport_read_config_32(mport, destid, hopcount, 554 RIO_DEV_ID_CAR, &tmp)) { 555 i++; 556 if (i == RIO_MAX_CHK_RETRY) 557 return -EIO; 558 mdelay(1); 559 } 560 561 return 0; 562 } 563 564 /** 565 * rio_chk_dev_access - Validate access to the specified device. 566 * @rdev: Pointer to RIO device control structure 567 */ 568 static int rio_chk_dev_access(struct rio_dev *rdev) 569 { 570 u8 hopcount = 0xff; 571 u16 destid = rdev->destid; 572 573 if (rdev->rswitch) { 574 destid = rdev->rswitch->destid; 575 hopcount = rdev->rswitch->hopcount; 576 } 577 578 return rio_mport_chk_dev_access(rdev->net->hport, destid, hopcount); 579 } 580 581 /** 582 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and 583 * returns link-response (if requested). 584 * @rdev: RIO devive to issue Input-status command 585 * @pnum: Device port number to issue the command 586 * @lnkresp: Response from a link partner 587 */ 588 static int 589 rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp) 590 { 591 struct rio_mport *mport = rdev->net->hport; 592 u16 destid = rdev->rswitch->destid; 593 u8 hopcount = rdev->rswitch->hopcount; 594 u32 regval; 595 int checkcount; 596 597 if (lnkresp) { 598 /* Read from link maintenance response register 599 * to clear valid bit */ 600 rio_mport_read_config_32(mport, destid, hopcount, 601 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum), 602 ®val); 603 udelay(50); 604 } 605 606 /* Issue Input-status command */ 607 rio_mport_write_config_32(mport, destid, hopcount, 608 rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum), 609 RIO_MNT_REQ_CMD_IS); 610 611 /* Exit if the response is not expected */ 612 if (lnkresp == NULL) 613 return 0; 614 615 checkcount = 3; 616 while (checkcount--) { 617 udelay(50); 618 rio_mport_read_config_32(mport, destid, hopcount, 619 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum), 620 ®val); 621 if (regval & RIO_PORT_N_MNT_RSP_RVAL) { 622 *lnkresp = regval; 623 return 0; 624 } 625 } 626 627 return -EIO; 628 } 629 630 /** 631 * rio_clr_err_stopped - Clears port Error-stopped states. 632 * @rdev: Pointer to RIO device control structure 633 * @pnum: Switch port number to clear errors 634 * @err_status: port error status (if 0 reads register from device) 635 */ 636 static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status) 637 { 638 struct rio_mport *mport = rdev->net->hport; 639 u16 destid = rdev->rswitch->destid; 640 u8 hopcount = rdev->rswitch->hopcount; 641 struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum]; 642 u32 regval; 643 u32 far_ackid, far_linkstat, near_ackid; 644 645 if (err_status == 0) 646 rio_mport_read_config_32(mport, destid, hopcount, 647 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum), 648 &err_status); 649 650 if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) { 651 pr_debug("RIO_EM: servicing Output Error-Stopped state\n"); 652 /* 653 * Send a Link-Request/Input-Status control symbol 654 */ 655 if (rio_get_input_status(rdev, pnum, ®val)) { 656 pr_debug("RIO_EM: Input-status response timeout\n"); 657 goto rd_err; 658 } 659 660 pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n", 661 pnum, regval); 662 far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5; 663 far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT; 664 rio_mport_read_config_32(mport, destid, hopcount, 665 rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum), 666 ®val); 667 pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval); 668 near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24; 669 pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \ 670 " near_ackID=0x%02x\n", 671 pnum, far_ackid, far_linkstat, near_ackid); 672 673 /* 674 * If required, synchronize ackIDs of near and 675 * far sides. 676 */ 677 if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) || 678 (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) { 679 /* Align near outstanding/outbound ackIDs with 680 * far inbound. 681 */ 682 rio_mport_write_config_32(mport, destid, 683 hopcount, rdev->phys_efptr + 684 RIO_PORT_N_ACK_STS_CSR(pnum), 685 (near_ackid << 24) | 686 (far_ackid << 8) | far_ackid); 687 /* Align far outstanding/outbound ackIDs with 688 * near inbound. 689 */ 690 far_ackid++; 691 if (nextdev) 692 rio_write_config_32(nextdev, 693 nextdev->phys_efptr + 694 RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)), 695 (far_ackid << 24) | 696 (near_ackid << 8) | near_ackid); 697 else 698 pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n"); 699 } 700 rd_err: 701 rio_mport_read_config_32(mport, destid, hopcount, 702 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum), 703 &err_status); 704 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status); 705 } 706 707 if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) { 708 pr_debug("RIO_EM: servicing Input Error-Stopped state\n"); 709 rio_get_input_status(nextdev, 710 RIO_GET_PORT_NUM(nextdev->swpinfo), NULL); 711 udelay(50); 712 713 rio_mport_read_config_32(mport, destid, hopcount, 714 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum), 715 &err_status); 716 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status); 717 } 718 719 return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES | 720 RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0; 721 } 722 723 /** 724 * rio_inb_pwrite_handler - process inbound port-write message 725 * @pw_msg: pointer to inbound port-write message 726 * 727 * Processes an inbound port-write message. Returns 0 if the request 728 * has been satisfied. 729 */ 730 int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg) 731 { 732 struct rio_dev *rdev; 733 struct rio_mport *mport; 734 u8 hopcount; 735 u16 destid; 736 u32 err_status, em_perrdet, em_ltlerrdet; 737 int rc, portnum; 738 739 rdev = rio_get_comptag(pw_msg->em.comptag, NULL); 740 if (rdev == NULL) { 741 /* Device removed or enumeration error */ 742 pr_debug("RIO: %s No matching device for CTag 0x%08x\n", 743 __func__, pw_msg->em.comptag); 744 return -EIO; 745 } 746 747 pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev)); 748 749 #ifdef DEBUG_PW 750 { 751 u32 i; 752 for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32);) { 753 pr_debug("0x%02x: %08x %08x %08x %08x\n", 754 i*4, pw_msg->raw[i], pw_msg->raw[i + 1], 755 pw_msg->raw[i + 2], pw_msg->raw[i + 3]); 756 i += 4; 757 } 758 } 759 #endif 760 761 /* Call an external service function (if such is registered 762 * for this device). This may be the service for endpoints that send 763 * device-specific port-write messages. End-point messages expected 764 * to be handled completely by EP specific device driver. 765 * For switches rc==0 signals that no standard processing required. 766 */ 767 if (rdev->pwcback != NULL) { 768 rc = rdev->pwcback(rdev, pw_msg, 0); 769 if (rc == 0) 770 return 0; 771 } 772 773 portnum = pw_msg->em.is_port & 0xFF; 774 775 /* Check if device and route to it are functional: 776 * Sometimes devices may send PW message(s) just before being 777 * powered down (or link being lost). 778 */ 779 if (rio_chk_dev_access(rdev)) { 780 pr_debug("RIO: device access failed - get link partner\n"); 781 /* Scan route to the device and identify failed link. 782 * This will replace device and port reported in PW message. 783 * PW message should not be used after this point. 784 */ 785 if (rio_chk_dev_route(rdev, &rdev, &portnum)) { 786 pr_err("RIO: Route trace for %s failed\n", 787 rio_name(rdev)); 788 return -EIO; 789 } 790 pw_msg = NULL; 791 } 792 793 /* For End-point devices processing stops here */ 794 if (!(rdev->pef & RIO_PEF_SWITCH)) 795 return 0; 796 797 if (rdev->phys_efptr == 0) { 798 pr_err("RIO_PW: Bad switch initialization for %s\n", 799 rio_name(rdev)); 800 return 0; 801 } 802 803 mport = rdev->net->hport; 804 destid = rdev->rswitch->destid; 805 hopcount = rdev->rswitch->hopcount; 806 807 /* 808 * Process the port-write notification from switch 809 */ 810 if (rdev->rswitch->em_handle) 811 rdev->rswitch->em_handle(rdev, portnum); 812 813 rio_mport_read_config_32(mport, destid, hopcount, 814 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum), 815 &err_status); 816 pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status); 817 818 if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) { 819 820 if (!(rdev->rswitch->port_ok & (1 << portnum))) { 821 rdev->rswitch->port_ok |= (1 << portnum); 822 rio_set_port_lockout(rdev, portnum, 0); 823 /* Schedule Insertion Service */ 824 pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n", 825 rio_name(rdev), portnum); 826 } 827 828 /* Clear error-stopped states (if reported). 829 * Depending on the link partner state, two attempts 830 * may be needed for successful recovery. 831 */ 832 if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES | 833 RIO_PORT_N_ERR_STS_PW_INP_ES)) { 834 if (rio_clr_err_stopped(rdev, portnum, err_status)) 835 rio_clr_err_stopped(rdev, portnum, 0); 836 } 837 } else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */ 838 839 if (rdev->rswitch->port_ok & (1 << portnum)) { 840 rdev->rswitch->port_ok &= ~(1 << portnum); 841 rio_set_port_lockout(rdev, portnum, 1); 842 843 rio_mport_write_config_32(mport, destid, hopcount, 844 rdev->phys_efptr + 845 RIO_PORT_N_ACK_STS_CSR(portnum), 846 RIO_PORT_N_ACK_CLEAR); 847 848 /* Schedule Extraction Service */ 849 pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n", 850 rio_name(rdev), portnum); 851 } 852 } 853 854 rio_mport_read_config_32(mport, destid, hopcount, 855 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet); 856 if (em_perrdet) { 857 pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n", 858 portnum, em_perrdet); 859 /* Clear EM Port N Error Detect CSR */ 860 rio_mport_write_config_32(mport, destid, hopcount, 861 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0); 862 } 863 864 rio_mport_read_config_32(mport, destid, hopcount, 865 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet); 866 if (em_ltlerrdet) { 867 pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n", 868 em_ltlerrdet); 869 /* Clear EM L/T Layer Error Detect CSR */ 870 rio_mport_write_config_32(mport, destid, hopcount, 871 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0); 872 } 873 874 /* Clear remaining error bits and Port-Write Pending bit */ 875 rio_mport_write_config_32(mport, destid, hopcount, 876 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum), 877 err_status); 878 879 return 0; 880 } 881 EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler); 882 883 /** 884 * rio_mport_get_efb - get pointer to next extended features block 885 * @port: Master port to issue transaction 886 * @local: Indicate a local master port or remote device access 887 * @destid: Destination ID of the device 888 * @hopcount: Number of switch hops to the device 889 * @from: Offset of current Extended Feature block header (if 0 starts 890 * from ExtFeaturePtr) 891 */ 892 u32 893 rio_mport_get_efb(struct rio_mport *port, int local, u16 destid, 894 u8 hopcount, u32 from) 895 { 896 u32 reg_val; 897 898 if (from == 0) { 899 if (local) 900 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, 901 ®_val); 902 else 903 rio_mport_read_config_32(port, destid, hopcount, 904 RIO_ASM_INFO_CAR, ®_val); 905 return reg_val & RIO_EXT_FTR_PTR_MASK; 906 } else { 907 if (local) 908 rio_local_read_config_32(port, from, ®_val); 909 else 910 rio_mport_read_config_32(port, destid, hopcount, 911 from, ®_val); 912 return RIO_GET_BLOCK_ID(reg_val); 913 } 914 } 915 916 /** 917 * rio_mport_get_feature - query for devices' extended features 918 * @port: Master port to issue transaction 919 * @local: Indicate a local master port or remote device access 920 * @destid: Destination ID of the device 921 * @hopcount: Number of switch hops to the device 922 * @ftr: Extended feature code 923 * 924 * Tell if a device supports a given RapidIO capability. 925 * Returns the offset of the requested extended feature 926 * block within the device's RIO configuration space or 927 * 0 in case the device does not support it. Possible 928 * values for @ftr: 929 * 930 * %RIO_EFB_PAR_EP_ID LP/LVDS EP Devices 931 * 932 * %RIO_EFB_PAR_EP_REC_ID LP/LVDS EP Recovery Devices 933 * 934 * %RIO_EFB_PAR_EP_FREE_ID LP/LVDS EP Free Devices 935 * 936 * %RIO_EFB_SER_EP_ID LP/Serial EP Devices 937 * 938 * %RIO_EFB_SER_EP_REC_ID LP/Serial EP Recovery Devices 939 * 940 * %RIO_EFB_SER_EP_FREE_ID LP/Serial EP Free Devices 941 */ 942 u32 943 rio_mport_get_feature(struct rio_mport * port, int local, u16 destid, 944 u8 hopcount, int ftr) 945 { 946 u32 asm_info, ext_ftr_ptr, ftr_header; 947 948 if (local) 949 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info); 950 else 951 rio_mport_read_config_32(port, destid, hopcount, 952 RIO_ASM_INFO_CAR, &asm_info); 953 954 ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK; 955 956 while (ext_ftr_ptr) { 957 if (local) 958 rio_local_read_config_32(port, ext_ftr_ptr, 959 &ftr_header); 960 else 961 rio_mport_read_config_32(port, destid, hopcount, 962 ext_ftr_ptr, &ftr_header); 963 if (RIO_GET_BLOCK_ID(ftr_header) == ftr) 964 return ext_ftr_ptr; 965 if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header))) 966 break; 967 } 968 969 return 0; 970 } 971 972 /** 973 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did 974 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids 975 * @did: RIO did to match or %RIO_ANY_ID to match all dids 976 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids 977 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids 978 * @from: Previous RIO device found in search, or %NULL for new search 979 * 980 * Iterates through the list of known RIO devices. If a RIO device is 981 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference 982 * count to the device is incrememted and a pointer to its device 983 * structure is returned. Otherwise, %NULL is returned. A new search 984 * is initiated by passing %NULL to the @from argument. Otherwise, if 985 * @from is not %NULL, searches continue from next device on the global 986 * list. The reference count for @from is always decremented if it is 987 * not %NULL. 988 */ 989 struct rio_dev *rio_get_asm(u16 vid, u16 did, 990 u16 asm_vid, u16 asm_did, struct rio_dev *from) 991 { 992 struct list_head *n; 993 struct rio_dev *rdev; 994 995 WARN_ON(in_interrupt()); 996 spin_lock(&rio_global_list_lock); 997 n = from ? from->global_list.next : rio_devices.next; 998 999 while (n && (n != &rio_devices)) { 1000 rdev = rio_dev_g(n); 1001 if ((vid == RIO_ANY_ID || rdev->vid == vid) && 1002 (did == RIO_ANY_ID || rdev->did == did) && 1003 (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) && 1004 (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did)) 1005 goto exit; 1006 n = n->next; 1007 } 1008 rdev = NULL; 1009 exit: 1010 rio_dev_put(from); 1011 rdev = rio_dev_get(rdev); 1012 spin_unlock(&rio_global_list_lock); 1013 return rdev; 1014 } 1015 1016 /** 1017 * rio_get_device - Begin or continue searching for a RIO device by vid/did 1018 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids 1019 * @did: RIO did to match or %RIO_ANY_ID to match all dids 1020 * @from: Previous RIO device found in search, or %NULL for new search 1021 * 1022 * Iterates through the list of known RIO devices. If a RIO device is 1023 * found with a matching @vid and @did, the reference count to the 1024 * device is incrememted and a pointer to its device structure is returned. 1025 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL 1026 * to the @from argument. Otherwise, if @from is not %NULL, searches 1027 * continue from next device on the global list. The reference count for 1028 * @from is always decremented if it is not %NULL. 1029 */ 1030 struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from) 1031 { 1032 return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from); 1033 } 1034 1035 /** 1036 * rio_std_route_add_entry - Add switch route table entry using standard 1037 * registers defined in RIO specification rev.1.3 1038 * @mport: Master port to issue transaction 1039 * @destid: Destination ID of the device 1040 * @hopcount: Number of switch hops to the device 1041 * @table: routing table ID (global or port-specific) 1042 * @route_destid: destID entry in the RT 1043 * @route_port: destination port for specified destID 1044 */ 1045 int rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount, 1046 u16 table, u16 route_destid, u8 route_port) 1047 { 1048 if (table == RIO_GLOBAL_TABLE) { 1049 rio_mport_write_config_32(mport, destid, hopcount, 1050 RIO_STD_RTE_CONF_DESTID_SEL_CSR, 1051 (u32)route_destid); 1052 rio_mport_write_config_32(mport, destid, hopcount, 1053 RIO_STD_RTE_CONF_PORT_SEL_CSR, 1054 (u32)route_port); 1055 } 1056 1057 udelay(10); 1058 return 0; 1059 } 1060 1061 /** 1062 * rio_std_route_get_entry - Read switch route table entry (port number) 1063 * associated with specified destID using standard registers defined in RIO 1064 * specification rev.1.3 1065 * @mport: Master port to issue transaction 1066 * @destid: Destination ID of the device 1067 * @hopcount: Number of switch hops to the device 1068 * @table: routing table ID (global or port-specific) 1069 * @route_destid: destID entry in the RT 1070 * @route_port: returned destination port for specified destID 1071 */ 1072 int rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount, 1073 u16 table, u16 route_destid, u8 *route_port) 1074 { 1075 u32 result; 1076 1077 if (table == RIO_GLOBAL_TABLE) { 1078 rio_mport_write_config_32(mport, destid, hopcount, 1079 RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid); 1080 rio_mport_read_config_32(mport, destid, hopcount, 1081 RIO_STD_RTE_CONF_PORT_SEL_CSR, &result); 1082 1083 *route_port = (u8)result; 1084 } 1085 1086 return 0; 1087 } 1088 1089 /** 1090 * rio_std_route_clr_table - Clear swotch route table using standard registers 1091 * defined in RIO specification rev.1.3. 1092 * @mport: Master port to issue transaction 1093 * @destid: Destination ID of the device 1094 * @hopcount: Number of switch hops to the device 1095 * @table: routing table ID (global or port-specific) 1096 */ 1097 int rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount, 1098 u16 table) 1099 { 1100 u32 max_destid = 0xff; 1101 u32 i, pef, id_inc = 1, ext_cfg = 0; 1102 u32 port_sel = RIO_INVALID_ROUTE; 1103 1104 if (table == RIO_GLOBAL_TABLE) { 1105 rio_mport_read_config_32(mport, destid, hopcount, 1106 RIO_PEF_CAR, &pef); 1107 1108 if (mport->sys_size) { 1109 rio_mport_read_config_32(mport, destid, hopcount, 1110 RIO_SWITCH_RT_LIMIT, 1111 &max_destid); 1112 max_destid &= RIO_RT_MAX_DESTID; 1113 } 1114 1115 if (pef & RIO_PEF_EXT_RT) { 1116 ext_cfg = 0x80000000; 1117 id_inc = 4; 1118 port_sel = (RIO_INVALID_ROUTE << 24) | 1119 (RIO_INVALID_ROUTE << 16) | 1120 (RIO_INVALID_ROUTE << 8) | 1121 RIO_INVALID_ROUTE; 1122 } 1123 1124 for (i = 0; i <= max_destid;) { 1125 rio_mport_write_config_32(mport, destid, hopcount, 1126 RIO_STD_RTE_CONF_DESTID_SEL_CSR, 1127 ext_cfg | i); 1128 rio_mport_write_config_32(mport, destid, hopcount, 1129 RIO_STD_RTE_CONF_PORT_SEL_CSR, 1130 port_sel); 1131 i += id_inc; 1132 } 1133 } 1134 1135 udelay(10); 1136 return 0; 1137 } 1138 1139 static void rio_fixup_device(struct rio_dev *dev) 1140 { 1141 } 1142 1143 static int __devinit rio_init(void) 1144 { 1145 struct rio_dev *dev = NULL; 1146 1147 while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) { 1148 rio_fixup_device(dev); 1149 } 1150 return 0; 1151 } 1152 1153 device_initcall(rio_init); 1154 1155 int __devinit rio_init_mports(void) 1156 { 1157 int rc = 0; 1158 struct rio_mport *port; 1159 1160 list_for_each_entry(port, &rio_mports, node) { 1161 if (!request_mem_region(port->iores.start, 1162 resource_size(&port->iores), 1163 port->name)) { 1164 printk(KERN_ERR 1165 "RIO: Error requesting master port region 0x%016llx-0x%016llx\n", 1166 (u64)port->iores.start, (u64)port->iores.end); 1167 rc = -ENOMEM; 1168 goto out; 1169 } 1170 1171 if (port->host_deviceid >= 0) 1172 rio_enum_mport(port); 1173 else 1174 rio_disc_mport(port); 1175 } 1176 1177 out: 1178 return rc; 1179 } 1180 1181 void rio_register_mport(struct rio_mport *port) 1182 { 1183 list_add_tail(&port->node, &rio_mports); 1184 } 1185 1186 EXPORT_SYMBOL_GPL(rio_local_get_device_id); 1187 EXPORT_SYMBOL_GPL(rio_get_device); 1188 EXPORT_SYMBOL_GPL(rio_get_asm); 1189 EXPORT_SYMBOL_GPL(rio_request_inb_dbell); 1190 EXPORT_SYMBOL_GPL(rio_release_inb_dbell); 1191 EXPORT_SYMBOL_GPL(rio_request_outb_dbell); 1192 EXPORT_SYMBOL_GPL(rio_release_outb_dbell); 1193 EXPORT_SYMBOL_GPL(rio_request_inb_mbox); 1194 EXPORT_SYMBOL_GPL(rio_release_inb_mbox); 1195 EXPORT_SYMBOL_GPL(rio_request_outb_mbox); 1196 EXPORT_SYMBOL_GPL(rio_release_outb_mbox); 1197