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 u32 regval; 475 476 rio_read_config_32(rdev, 477 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum), 478 ®val); 479 if (lock) 480 regval |= RIO_PORT_N_CTL_LOCKOUT; 481 else 482 regval &= ~RIO_PORT_N_CTL_LOCKOUT; 483 484 rio_write_config_32(rdev, 485 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum), 486 regval); 487 return 0; 488 } 489 490 /** 491 * rio_chk_dev_route - Validate route to the specified device. 492 * @rdev: RIO device failed to respond 493 * @nrdev: Last active device on the route to rdev 494 * @npnum: nrdev's port number on the route to rdev 495 * 496 * Follows a route to the specified RIO device to determine the last available 497 * device (and corresponding RIO port) on the route. 498 */ 499 static int 500 rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum) 501 { 502 u32 result; 503 int p_port, rc = -EIO; 504 struct rio_dev *prev = NULL; 505 506 /* Find switch with failed RIO link */ 507 while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) { 508 if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) { 509 prev = rdev->prev; 510 break; 511 } 512 rdev = rdev->prev; 513 } 514 515 if (prev == NULL) 516 goto err_out; 517 518 p_port = prev->rswitch->route_table[rdev->destid]; 519 520 if (p_port != RIO_INVALID_ROUTE) { 521 pr_debug("RIO: link failed on [%s]-P%d\n", 522 rio_name(prev), p_port); 523 *nrdev = prev; 524 *npnum = p_port; 525 rc = 0; 526 } else 527 pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev)); 528 err_out: 529 return rc; 530 } 531 532 /** 533 * rio_mport_chk_dev_access - Validate access to the specified device. 534 * @mport: Master port to send transactions 535 * @destid: Device destination ID in network 536 * @hopcount: Number of hops into the network 537 */ 538 int 539 rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount) 540 { 541 int i = 0; 542 u32 tmp; 543 544 while (rio_mport_read_config_32(mport, destid, hopcount, 545 RIO_DEV_ID_CAR, &tmp)) { 546 i++; 547 if (i == RIO_MAX_CHK_RETRY) 548 return -EIO; 549 mdelay(1); 550 } 551 552 return 0; 553 } 554 555 /** 556 * rio_chk_dev_access - Validate access to the specified device. 557 * @rdev: Pointer to RIO device control structure 558 */ 559 static int rio_chk_dev_access(struct rio_dev *rdev) 560 { 561 return rio_mport_chk_dev_access(rdev->net->hport, 562 rdev->destid, rdev->hopcount); 563 } 564 565 /** 566 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and 567 * returns link-response (if requested). 568 * @rdev: RIO devive to issue Input-status command 569 * @pnum: Device port number to issue the command 570 * @lnkresp: Response from a link partner 571 */ 572 static int 573 rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp) 574 { 575 u32 regval; 576 int checkcount; 577 578 if (lnkresp) { 579 /* Read from link maintenance response register 580 * to clear valid bit */ 581 rio_read_config_32(rdev, 582 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum), 583 ®val); 584 udelay(50); 585 } 586 587 /* Issue Input-status command */ 588 rio_write_config_32(rdev, 589 rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum), 590 RIO_MNT_REQ_CMD_IS); 591 592 /* Exit if the response is not expected */ 593 if (lnkresp == NULL) 594 return 0; 595 596 checkcount = 3; 597 while (checkcount--) { 598 udelay(50); 599 rio_read_config_32(rdev, 600 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum), 601 ®val); 602 if (regval & RIO_PORT_N_MNT_RSP_RVAL) { 603 *lnkresp = regval; 604 return 0; 605 } 606 } 607 608 return -EIO; 609 } 610 611 /** 612 * rio_clr_err_stopped - Clears port Error-stopped states. 613 * @rdev: Pointer to RIO device control structure 614 * @pnum: Switch port number to clear errors 615 * @err_status: port error status (if 0 reads register from device) 616 */ 617 static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status) 618 { 619 struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum]; 620 u32 regval; 621 u32 far_ackid, far_linkstat, near_ackid; 622 623 if (err_status == 0) 624 rio_read_config_32(rdev, 625 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum), 626 &err_status); 627 628 if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) { 629 pr_debug("RIO_EM: servicing Output Error-Stopped state\n"); 630 /* 631 * Send a Link-Request/Input-Status control symbol 632 */ 633 if (rio_get_input_status(rdev, pnum, ®val)) { 634 pr_debug("RIO_EM: Input-status response timeout\n"); 635 goto rd_err; 636 } 637 638 pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n", 639 pnum, regval); 640 far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5; 641 far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT; 642 rio_read_config_32(rdev, 643 rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum), 644 ®val); 645 pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval); 646 near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24; 647 pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \ 648 " near_ackID=0x%02x\n", 649 pnum, far_ackid, far_linkstat, near_ackid); 650 651 /* 652 * If required, synchronize ackIDs of near and 653 * far sides. 654 */ 655 if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) || 656 (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) { 657 /* Align near outstanding/outbound ackIDs with 658 * far inbound. 659 */ 660 rio_write_config_32(rdev, 661 rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum), 662 (near_ackid << 24) | 663 (far_ackid << 8) | far_ackid); 664 /* Align far outstanding/outbound ackIDs with 665 * near inbound. 666 */ 667 far_ackid++; 668 if (nextdev) 669 rio_write_config_32(nextdev, 670 nextdev->phys_efptr + 671 RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)), 672 (far_ackid << 24) | 673 (near_ackid << 8) | near_ackid); 674 else 675 pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n"); 676 } 677 rd_err: 678 rio_read_config_32(rdev, 679 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum), 680 &err_status); 681 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status); 682 } 683 684 if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) { 685 pr_debug("RIO_EM: servicing Input Error-Stopped state\n"); 686 rio_get_input_status(nextdev, 687 RIO_GET_PORT_NUM(nextdev->swpinfo), NULL); 688 udelay(50); 689 690 rio_read_config_32(rdev, 691 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum), 692 &err_status); 693 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status); 694 } 695 696 return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES | 697 RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0; 698 } 699 700 /** 701 * rio_inb_pwrite_handler - process inbound port-write message 702 * @pw_msg: pointer to inbound port-write message 703 * 704 * Processes an inbound port-write message. Returns 0 if the request 705 * has been satisfied. 706 */ 707 int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg) 708 { 709 struct rio_dev *rdev; 710 u32 err_status, em_perrdet, em_ltlerrdet; 711 int rc, portnum; 712 713 rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL); 714 if (rdev == NULL) { 715 /* Device removed or enumeration error */ 716 pr_debug("RIO: %s No matching device for CTag 0x%08x\n", 717 __func__, pw_msg->em.comptag); 718 return -EIO; 719 } 720 721 pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev)); 722 723 #ifdef DEBUG_PW 724 { 725 u32 i; 726 for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32);) { 727 pr_debug("0x%02x: %08x %08x %08x %08x\n", 728 i*4, pw_msg->raw[i], pw_msg->raw[i + 1], 729 pw_msg->raw[i + 2], pw_msg->raw[i + 3]); 730 i += 4; 731 } 732 } 733 #endif 734 735 /* Call an external service function (if such is registered 736 * for this device). This may be the service for endpoints that send 737 * device-specific port-write messages. End-point messages expected 738 * to be handled completely by EP specific device driver. 739 * For switches rc==0 signals that no standard processing required. 740 */ 741 if (rdev->pwcback != NULL) { 742 rc = rdev->pwcback(rdev, pw_msg, 0); 743 if (rc == 0) 744 return 0; 745 } 746 747 portnum = pw_msg->em.is_port & 0xFF; 748 749 /* Check if device and route to it are functional: 750 * Sometimes devices may send PW message(s) just before being 751 * powered down (or link being lost). 752 */ 753 if (rio_chk_dev_access(rdev)) { 754 pr_debug("RIO: device access failed - get link partner\n"); 755 /* Scan route to the device and identify failed link. 756 * This will replace device and port reported in PW message. 757 * PW message should not be used after this point. 758 */ 759 if (rio_chk_dev_route(rdev, &rdev, &portnum)) { 760 pr_err("RIO: Route trace for %s failed\n", 761 rio_name(rdev)); 762 return -EIO; 763 } 764 pw_msg = NULL; 765 } 766 767 /* For End-point devices processing stops here */ 768 if (!(rdev->pef & RIO_PEF_SWITCH)) 769 return 0; 770 771 if (rdev->phys_efptr == 0) { 772 pr_err("RIO_PW: Bad switch initialization for %s\n", 773 rio_name(rdev)); 774 return 0; 775 } 776 777 /* 778 * Process the port-write notification from switch 779 */ 780 if (rdev->rswitch->em_handle) 781 rdev->rswitch->em_handle(rdev, portnum); 782 783 rio_read_config_32(rdev, 784 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum), 785 &err_status); 786 pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status); 787 788 if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) { 789 790 if (!(rdev->rswitch->port_ok & (1 << portnum))) { 791 rdev->rswitch->port_ok |= (1 << portnum); 792 rio_set_port_lockout(rdev, portnum, 0); 793 /* Schedule Insertion Service */ 794 pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n", 795 rio_name(rdev), portnum); 796 } 797 798 /* Clear error-stopped states (if reported). 799 * Depending on the link partner state, two attempts 800 * may be needed for successful recovery. 801 */ 802 if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES | 803 RIO_PORT_N_ERR_STS_PW_INP_ES)) { 804 if (rio_clr_err_stopped(rdev, portnum, err_status)) 805 rio_clr_err_stopped(rdev, portnum, 0); 806 } 807 } else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */ 808 809 if (rdev->rswitch->port_ok & (1 << portnum)) { 810 rdev->rswitch->port_ok &= ~(1 << portnum); 811 rio_set_port_lockout(rdev, portnum, 1); 812 813 rio_write_config_32(rdev, 814 rdev->phys_efptr + 815 RIO_PORT_N_ACK_STS_CSR(portnum), 816 RIO_PORT_N_ACK_CLEAR); 817 818 /* Schedule Extraction Service */ 819 pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n", 820 rio_name(rdev), portnum); 821 } 822 } 823 824 rio_read_config_32(rdev, 825 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet); 826 if (em_perrdet) { 827 pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n", 828 portnum, em_perrdet); 829 /* Clear EM Port N Error Detect CSR */ 830 rio_write_config_32(rdev, 831 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0); 832 } 833 834 rio_read_config_32(rdev, 835 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet); 836 if (em_ltlerrdet) { 837 pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n", 838 em_ltlerrdet); 839 /* Clear EM L/T Layer Error Detect CSR */ 840 rio_write_config_32(rdev, 841 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0); 842 } 843 844 /* Clear remaining error bits and Port-Write Pending bit */ 845 rio_write_config_32(rdev, 846 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum), 847 err_status); 848 849 return 0; 850 } 851 EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler); 852 853 /** 854 * rio_mport_get_efb - get pointer to next extended features block 855 * @port: Master port to issue transaction 856 * @local: Indicate a local master port or remote device access 857 * @destid: Destination ID of the device 858 * @hopcount: Number of switch hops to the device 859 * @from: Offset of current Extended Feature block header (if 0 starts 860 * from ExtFeaturePtr) 861 */ 862 u32 863 rio_mport_get_efb(struct rio_mport *port, int local, u16 destid, 864 u8 hopcount, u32 from) 865 { 866 u32 reg_val; 867 868 if (from == 0) { 869 if (local) 870 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, 871 ®_val); 872 else 873 rio_mport_read_config_32(port, destid, hopcount, 874 RIO_ASM_INFO_CAR, ®_val); 875 return reg_val & RIO_EXT_FTR_PTR_MASK; 876 } else { 877 if (local) 878 rio_local_read_config_32(port, from, ®_val); 879 else 880 rio_mport_read_config_32(port, destid, hopcount, 881 from, ®_val); 882 return RIO_GET_BLOCK_ID(reg_val); 883 } 884 } 885 886 /** 887 * rio_mport_get_feature - query for devices' extended features 888 * @port: Master port to issue transaction 889 * @local: Indicate a local master port or remote device access 890 * @destid: Destination ID of the device 891 * @hopcount: Number of switch hops to the device 892 * @ftr: Extended feature code 893 * 894 * Tell if a device supports a given RapidIO capability. 895 * Returns the offset of the requested extended feature 896 * block within the device's RIO configuration space or 897 * 0 in case the device does not support it. Possible 898 * values for @ftr: 899 * 900 * %RIO_EFB_PAR_EP_ID LP/LVDS EP Devices 901 * 902 * %RIO_EFB_PAR_EP_REC_ID LP/LVDS EP Recovery Devices 903 * 904 * %RIO_EFB_PAR_EP_FREE_ID LP/LVDS EP Free Devices 905 * 906 * %RIO_EFB_SER_EP_ID LP/Serial EP Devices 907 * 908 * %RIO_EFB_SER_EP_REC_ID LP/Serial EP Recovery Devices 909 * 910 * %RIO_EFB_SER_EP_FREE_ID LP/Serial EP Free Devices 911 */ 912 u32 913 rio_mport_get_feature(struct rio_mport * port, int local, u16 destid, 914 u8 hopcount, int ftr) 915 { 916 u32 asm_info, ext_ftr_ptr, ftr_header; 917 918 if (local) 919 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info); 920 else 921 rio_mport_read_config_32(port, destid, hopcount, 922 RIO_ASM_INFO_CAR, &asm_info); 923 924 ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK; 925 926 while (ext_ftr_ptr) { 927 if (local) 928 rio_local_read_config_32(port, ext_ftr_ptr, 929 &ftr_header); 930 else 931 rio_mport_read_config_32(port, destid, hopcount, 932 ext_ftr_ptr, &ftr_header); 933 if (RIO_GET_BLOCK_ID(ftr_header) == ftr) 934 return ext_ftr_ptr; 935 if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header))) 936 break; 937 } 938 939 return 0; 940 } 941 942 /** 943 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did 944 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids 945 * @did: RIO did to match or %RIO_ANY_ID to match all dids 946 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids 947 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids 948 * @from: Previous RIO device found in search, or %NULL for new search 949 * 950 * Iterates through the list of known RIO devices. If a RIO device is 951 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference 952 * count to the device is incrememted and a pointer to its device 953 * structure is returned. Otherwise, %NULL is returned. A new search 954 * is initiated by passing %NULL to the @from argument. Otherwise, if 955 * @from is not %NULL, searches continue from next device on the global 956 * list. The reference count for @from is always decremented if it is 957 * not %NULL. 958 */ 959 struct rio_dev *rio_get_asm(u16 vid, u16 did, 960 u16 asm_vid, u16 asm_did, struct rio_dev *from) 961 { 962 struct list_head *n; 963 struct rio_dev *rdev; 964 965 WARN_ON(in_interrupt()); 966 spin_lock(&rio_global_list_lock); 967 n = from ? from->global_list.next : rio_devices.next; 968 969 while (n && (n != &rio_devices)) { 970 rdev = rio_dev_g(n); 971 if ((vid == RIO_ANY_ID || rdev->vid == vid) && 972 (did == RIO_ANY_ID || rdev->did == did) && 973 (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) && 974 (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did)) 975 goto exit; 976 n = n->next; 977 } 978 rdev = NULL; 979 exit: 980 rio_dev_put(from); 981 rdev = rio_dev_get(rdev); 982 spin_unlock(&rio_global_list_lock); 983 return rdev; 984 } 985 986 /** 987 * rio_get_device - Begin or continue searching for a RIO device by vid/did 988 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids 989 * @did: RIO did to match or %RIO_ANY_ID to match all dids 990 * @from: Previous RIO device found in search, or %NULL for new search 991 * 992 * Iterates through the list of known RIO devices. If a RIO device is 993 * found with a matching @vid and @did, the reference count to the 994 * device is incrememted and a pointer to its device structure is returned. 995 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL 996 * to the @from argument. Otherwise, if @from is not %NULL, searches 997 * continue from next device on the global list. The reference count for 998 * @from is always decremented if it is not %NULL. 999 */ 1000 struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from) 1001 { 1002 return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from); 1003 } 1004 1005 /** 1006 * rio_std_route_add_entry - Add switch route table entry using standard 1007 * registers defined in RIO specification rev.1.3 1008 * @mport: Master port to issue transaction 1009 * @destid: Destination ID of the device 1010 * @hopcount: Number of switch hops to the device 1011 * @table: routing table ID (global or port-specific) 1012 * @route_destid: destID entry in the RT 1013 * @route_port: destination port for specified destID 1014 */ 1015 int rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount, 1016 u16 table, u16 route_destid, u8 route_port) 1017 { 1018 if (table == RIO_GLOBAL_TABLE) { 1019 rio_mport_write_config_32(mport, destid, hopcount, 1020 RIO_STD_RTE_CONF_DESTID_SEL_CSR, 1021 (u32)route_destid); 1022 rio_mport_write_config_32(mport, destid, hopcount, 1023 RIO_STD_RTE_CONF_PORT_SEL_CSR, 1024 (u32)route_port); 1025 } 1026 1027 udelay(10); 1028 return 0; 1029 } 1030 1031 /** 1032 * rio_std_route_get_entry - Read switch route table entry (port number) 1033 * associated with specified destID using standard registers defined in RIO 1034 * specification rev.1.3 1035 * @mport: Master port to issue transaction 1036 * @destid: Destination ID of the device 1037 * @hopcount: Number of switch hops to the device 1038 * @table: routing table ID (global or port-specific) 1039 * @route_destid: destID entry in the RT 1040 * @route_port: returned destination port for specified destID 1041 */ 1042 int rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount, 1043 u16 table, u16 route_destid, u8 *route_port) 1044 { 1045 u32 result; 1046 1047 if (table == RIO_GLOBAL_TABLE) { 1048 rio_mport_write_config_32(mport, destid, hopcount, 1049 RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid); 1050 rio_mport_read_config_32(mport, destid, hopcount, 1051 RIO_STD_RTE_CONF_PORT_SEL_CSR, &result); 1052 1053 *route_port = (u8)result; 1054 } 1055 1056 return 0; 1057 } 1058 1059 /** 1060 * rio_std_route_clr_table - Clear swotch route table using standard registers 1061 * defined in RIO specification rev.1.3. 1062 * @mport: Master port to issue transaction 1063 * @destid: Destination ID of the device 1064 * @hopcount: Number of switch hops to the device 1065 * @table: routing table ID (global or port-specific) 1066 */ 1067 int rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount, 1068 u16 table) 1069 { 1070 u32 max_destid = 0xff; 1071 u32 i, pef, id_inc = 1, ext_cfg = 0; 1072 u32 port_sel = RIO_INVALID_ROUTE; 1073 1074 if (table == RIO_GLOBAL_TABLE) { 1075 rio_mport_read_config_32(mport, destid, hopcount, 1076 RIO_PEF_CAR, &pef); 1077 1078 if (mport->sys_size) { 1079 rio_mport_read_config_32(mport, destid, hopcount, 1080 RIO_SWITCH_RT_LIMIT, 1081 &max_destid); 1082 max_destid &= RIO_RT_MAX_DESTID; 1083 } 1084 1085 if (pef & RIO_PEF_EXT_RT) { 1086 ext_cfg = 0x80000000; 1087 id_inc = 4; 1088 port_sel = (RIO_INVALID_ROUTE << 24) | 1089 (RIO_INVALID_ROUTE << 16) | 1090 (RIO_INVALID_ROUTE << 8) | 1091 RIO_INVALID_ROUTE; 1092 } 1093 1094 for (i = 0; i <= max_destid;) { 1095 rio_mport_write_config_32(mport, destid, hopcount, 1096 RIO_STD_RTE_CONF_DESTID_SEL_CSR, 1097 ext_cfg | i); 1098 rio_mport_write_config_32(mport, destid, hopcount, 1099 RIO_STD_RTE_CONF_PORT_SEL_CSR, 1100 port_sel); 1101 i += id_inc; 1102 } 1103 } 1104 1105 udelay(10); 1106 return 0; 1107 } 1108 1109 static void rio_fixup_device(struct rio_dev *dev) 1110 { 1111 } 1112 1113 static int __devinit rio_init(void) 1114 { 1115 struct rio_dev *dev = NULL; 1116 1117 while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) { 1118 rio_fixup_device(dev); 1119 } 1120 return 0; 1121 } 1122 1123 device_initcall(rio_init); 1124 1125 int __devinit rio_init_mports(void) 1126 { 1127 int rc = 0; 1128 struct rio_mport *port; 1129 1130 list_for_each_entry(port, &rio_mports, node) { 1131 if (!request_mem_region(port->iores.start, 1132 resource_size(&port->iores), 1133 port->name)) { 1134 printk(KERN_ERR 1135 "RIO: Error requesting master port region 0x%016llx-0x%016llx\n", 1136 (u64)port->iores.start, (u64)port->iores.end); 1137 rc = -ENOMEM; 1138 goto out; 1139 } 1140 1141 if (port->host_deviceid >= 0) 1142 rio_enum_mport(port); 1143 else 1144 rio_disc_mport(port); 1145 } 1146 1147 out: 1148 return rc; 1149 } 1150 1151 void rio_register_mport(struct rio_mport *port) 1152 { 1153 list_add_tail(&port->node, &rio_mports); 1154 } 1155 1156 EXPORT_SYMBOL_GPL(rio_local_get_device_id); 1157 EXPORT_SYMBOL_GPL(rio_get_device); 1158 EXPORT_SYMBOL_GPL(rio_get_asm); 1159 EXPORT_SYMBOL_GPL(rio_request_inb_dbell); 1160 EXPORT_SYMBOL_GPL(rio_release_inb_dbell); 1161 EXPORT_SYMBOL_GPL(rio_request_outb_dbell); 1162 EXPORT_SYMBOL_GPL(rio_release_outb_dbell); 1163 EXPORT_SYMBOL_GPL(rio_request_inb_mbox); 1164 EXPORT_SYMBOL_GPL(rio_release_inb_mbox); 1165 EXPORT_SYMBOL_GPL(rio_request_outb_mbox); 1166 EXPORT_SYMBOL_GPL(rio_release_outb_mbox); 1167