1 /* 2 * libata-core.c - helper library for ATA 3 * 4 * Maintained by: Jeff Garzik <jgarzik@pobox.com> 5 * Please ALWAYS copy linux-ide@vger.kernel.org 6 * on emails. 7 * 8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 9 * Copyright 2003-2004 Jeff Garzik 10 * 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; see the file COPYING. If not, write to 24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * 27 * libata documentation is available via 'make {ps|pdf}docs', 28 * as Documentation/DocBook/libata.* 29 * 30 * Hardware documentation available from http://www.t13.org/ and 31 * http://www.sata-io.org/ 32 * 33 * Standards documents from: 34 * http://www.t13.org (ATA standards, PCI DMA IDE spec) 35 * http://www.t10.org (SCSI MMC - for ATAPI MMC) 36 * http://www.sata-io.org (SATA) 37 * http://www.compactflash.org (CF) 38 * http://www.qic.org (QIC157 - Tape and DSC) 39 * http://www.ce-ata.org (CE-ATA: not supported) 40 * 41 */ 42 43 #include <linux/kernel.h> 44 #include <linux/module.h> 45 #include <linux/pci.h> 46 #include <linux/init.h> 47 #include <linux/list.h> 48 #include <linux/mm.h> 49 #include <linux/spinlock.h> 50 #include <linux/blkdev.h> 51 #include <linux/delay.h> 52 #include <linux/timer.h> 53 #include <linux/interrupt.h> 54 #include <linux/completion.h> 55 #include <linux/suspend.h> 56 #include <linux/workqueue.h> 57 #include <linux/scatterlist.h> 58 #include <linux/io.h> 59 #include <linux/async.h> 60 #include <scsi/scsi.h> 61 #include <scsi/scsi_cmnd.h> 62 #include <scsi/scsi_host.h> 63 #include <linux/libata.h> 64 #include <asm/byteorder.h> 65 #include <linux/cdrom.h> 66 67 #include "libata.h" 68 69 70 /* debounce timing parameters in msecs { interval, duration, timeout } */ 71 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 }; 72 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 }; 73 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 }; 74 75 const struct ata_port_operations ata_base_port_ops = { 76 .prereset = ata_std_prereset, 77 .postreset = ata_std_postreset, 78 .error_handler = ata_std_error_handler, 79 }; 80 81 const struct ata_port_operations sata_port_ops = { 82 .inherits = &ata_base_port_ops, 83 84 .qc_defer = ata_std_qc_defer, 85 .hardreset = sata_std_hardreset, 86 }; 87 88 static unsigned int ata_dev_init_params(struct ata_device *dev, 89 u16 heads, u16 sectors); 90 static unsigned int ata_dev_set_xfermode(struct ata_device *dev); 91 static unsigned int ata_dev_set_feature(struct ata_device *dev, 92 u8 enable, u8 feature); 93 static void ata_dev_xfermask(struct ata_device *dev); 94 static unsigned long ata_dev_blacklisted(const struct ata_device *dev); 95 96 unsigned int ata_print_id = 1; 97 static struct workqueue_struct *ata_wq; 98 99 struct workqueue_struct *ata_aux_wq; 100 101 struct ata_force_param { 102 const char *name; 103 unsigned int cbl; 104 int spd_limit; 105 unsigned long xfer_mask; 106 unsigned int horkage_on; 107 unsigned int horkage_off; 108 unsigned int lflags; 109 }; 110 111 struct ata_force_ent { 112 int port; 113 int device; 114 struct ata_force_param param; 115 }; 116 117 static struct ata_force_ent *ata_force_tbl; 118 static int ata_force_tbl_size; 119 120 static char ata_force_param_buf[PAGE_SIZE] __initdata; 121 /* param_buf is thrown away after initialization, disallow read */ 122 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0); 123 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/kernel-parameters.txt for details)"); 124 125 static int atapi_enabled = 1; 126 module_param(atapi_enabled, int, 0444); 127 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)"); 128 129 static int atapi_dmadir = 0; 130 module_param(atapi_dmadir, int, 0444); 131 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)"); 132 133 int atapi_passthru16 = 1; 134 module_param(atapi_passthru16, int, 0444); 135 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)"); 136 137 int libata_fua = 0; 138 module_param_named(fua, libata_fua, int, 0444); 139 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)"); 140 141 static int ata_ignore_hpa; 142 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644); 143 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)"); 144 145 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA; 146 module_param_named(dma, libata_dma_mask, int, 0444); 147 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)"); 148 149 static int ata_probe_timeout; 150 module_param(ata_probe_timeout, int, 0444); 151 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)"); 152 153 int libata_noacpi = 0; 154 module_param_named(noacpi, libata_noacpi, int, 0444); 155 MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set"); 156 157 int libata_allow_tpm = 0; 158 module_param_named(allow_tpm, libata_allow_tpm, int, 0444); 159 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands"); 160 161 MODULE_AUTHOR("Jeff Garzik"); 162 MODULE_DESCRIPTION("Library module for ATA devices"); 163 MODULE_LICENSE("GPL"); 164 MODULE_VERSION(DRV_VERSION); 165 166 167 /** 168 * ata_link_next - link iteration helper 169 * @link: the previous link, NULL to start 170 * @ap: ATA port containing links to iterate 171 * @mode: iteration mode, one of ATA_LITER_* 172 * 173 * LOCKING: 174 * Host lock or EH context. 175 * 176 * RETURNS: 177 * Pointer to the next link. 178 */ 179 struct ata_link *ata_link_next(struct ata_link *link, struct ata_port *ap, 180 enum ata_link_iter_mode mode) 181 { 182 BUG_ON(mode != ATA_LITER_EDGE && 183 mode != ATA_LITER_PMP_FIRST && mode != ATA_LITER_HOST_FIRST); 184 185 /* NULL link indicates start of iteration */ 186 if (!link) 187 switch (mode) { 188 case ATA_LITER_EDGE: 189 case ATA_LITER_PMP_FIRST: 190 if (sata_pmp_attached(ap)) 191 return ap->pmp_link; 192 /* fall through */ 193 case ATA_LITER_HOST_FIRST: 194 return &ap->link; 195 } 196 197 /* we just iterated over the host link, what's next? */ 198 if (link == &ap->link) 199 switch (mode) { 200 case ATA_LITER_HOST_FIRST: 201 if (sata_pmp_attached(ap)) 202 return ap->pmp_link; 203 /* fall through */ 204 case ATA_LITER_PMP_FIRST: 205 if (unlikely(ap->slave_link)) 206 return ap->slave_link; 207 /* fall through */ 208 case ATA_LITER_EDGE: 209 return NULL; 210 } 211 212 /* slave_link excludes PMP */ 213 if (unlikely(link == ap->slave_link)) 214 return NULL; 215 216 /* we were over a PMP link */ 217 if (++link < ap->pmp_link + ap->nr_pmp_links) 218 return link; 219 220 if (mode == ATA_LITER_PMP_FIRST) 221 return &ap->link; 222 223 return NULL; 224 } 225 226 /** 227 * ata_dev_next - device iteration helper 228 * @dev: the previous device, NULL to start 229 * @link: ATA link containing devices to iterate 230 * @mode: iteration mode, one of ATA_DITER_* 231 * 232 * LOCKING: 233 * Host lock or EH context. 234 * 235 * RETURNS: 236 * Pointer to the next device. 237 */ 238 struct ata_device *ata_dev_next(struct ata_device *dev, struct ata_link *link, 239 enum ata_dev_iter_mode mode) 240 { 241 BUG_ON(mode != ATA_DITER_ENABLED && mode != ATA_DITER_ENABLED_REVERSE && 242 mode != ATA_DITER_ALL && mode != ATA_DITER_ALL_REVERSE); 243 244 /* NULL dev indicates start of iteration */ 245 if (!dev) 246 switch (mode) { 247 case ATA_DITER_ENABLED: 248 case ATA_DITER_ALL: 249 dev = link->device; 250 goto check; 251 case ATA_DITER_ENABLED_REVERSE: 252 case ATA_DITER_ALL_REVERSE: 253 dev = link->device + ata_link_max_devices(link) - 1; 254 goto check; 255 } 256 257 next: 258 /* move to the next one */ 259 switch (mode) { 260 case ATA_DITER_ENABLED: 261 case ATA_DITER_ALL: 262 if (++dev < link->device + ata_link_max_devices(link)) 263 goto check; 264 return NULL; 265 case ATA_DITER_ENABLED_REVERSE: 266 case ATA_DITER_ALL_REVERSE: 267 if (--dev >= link->device) 268 goto check; 269 return NULL; 270 } 271 272 check: 273 if ((mode == ATA_DITER_ENABLED || mode == ATA_DITER_ENABLED_REVERSE) && 274 !ata_dev_enabled(dev)) 275 goto next; 276 return dev; 277 } 278 279 /** 280 * ata_dev_phys_link - find physical link for a device 281 * @dev: ATA device to look up physical link for 282 * 283 * Look up physical link which @dev is attached to. Note that 284 * this is different from @dev->link only when @dev is on slave 285 * link. For all other cases, it's the same as @dev->link. 286 * 287 * LOCKING: 288 * Don't care. 289 * 290 * RETURNS: 291 * Pointer to the found physical link. 292 */ 293 struct ata_link *ata_dev_phys_link(struct ata_device *dev) 294 { 295 struct ata_port *ap = dev->link->ap; 296 297 if (!ap->slave_link) 298 return dev->link; 299 if (!dev->devno) 300 return &ap->link; 301 return ap->slave_link; 302 } 303 304 /** 305 * ata_force_cbl - force cable type according to libata.force 306 * @ap: ATA port of interest 307 * 308 * Force cable type according to libata.force and whine about it. 309 * The last entry which has matching port number is used, so it 310 * can be specified as part of device force parameters. For 311 * example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the 312 * same effect. 313 * 314 * LOCKING: 315 * EH context. 316 */ 317 void ata_force_cbl(struct ata_port *ap) 318 { 319 int i; 320 321 for (i = ata_force_tbl_size - 1; i >= 0; i--) { 322 const struct ata_force_ent *fe = &ata_force_tbl[i]; 323 324 if (fe->port != -1 && fe->port != ap->print_id) 325 continue; 326 327 if (fe->param.cbl == ATA_CBL_NONE) 328 continue; 329 330 ap->cbl = fe->param.cbl; 331 ata_port_printk(ap, KERN_NOTICE, 332 "FORCE: cable set to %s\n", fe->param.name); 333 return; 334 } 335 } 336 337 /** 338 * ata_force_link_limits - force link limits according to libata.force 339 * @link: ATA link of interest 340 * 341 * Force link flags and SATA spd limit according to libata.force 342 * and whine about it. When only the port part is specified 343 * (e.g. 1:), the limit applies to all links connected to both 344 * the host link and all fan-out ports connected via PMP. If the 345 * device part is specified as 0 (e.g. 1.00:), it specifies the 346 * first fan-out link not the host link. Device number 15 always 347 * points to the host link whether PMP is attached or not. If the 348 * controller has slave link, device number 16 points to it. 349 * 350 * LOCKING: 351 * EH context. 352 */ 353 static void ata_force_link_limits(struct ata_link *link) 354 { 355 bool did_spd = false; 356 int linkno = link->pmp; 357 int i; 358 359 if (ata_is_host_link(link)) 360 linkno += 15; 361 362 for (i = ata_force_tbl_size - 1; i >= 0; i--) { 363 const struct ata_force_ent *fe = &ata_force_tbl[i]; 364 365 if (fe->port != -1 && fe->port != link->ap->print_id) 366 continue; 367 368 if (fe->device != -1 && fe->device != linkno) 369 continue; 370 371 /* only honor the first spd limit */ 372 if (!did_spd && fe->param.spd_limit) { 373 link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1; 374 ata_link_printk(link, KERN_NOTICE, 375 "FORCE: PHY spd limit set to %s\n", 376 fe->param.name); 377 did_spd = true; 378 } 379 380 /* let lflags stack */ 381 if (fe->param.lflags) { 382 link->flags |= fe->param.lflags; 383 ata_link_printk(link, KERN_NOTICE, 384 "FORCE: link flag 0x%x forced -> 0x%x\n", 385 fe->param.lflags, link->flags); 386 } 387 } 388 } 389 390 /** 391 * ata_force_xfermask - force xfermask according to libata.force 392 * @dev: ATA device of interest 393 * 394 * Force xfer_mask according to libata.force and whine about it. 395 * For consistency with link selection, device number 15 selects 396 * the first device connected to the host link. 397 * 398 * LOCKING: 399 * EH context. 400 */ 401 static void ata_force_xfermask(struct ata_device *dev) 402 { 403 int devno = dev->link->pmp + dev->devno; 404 int alt_devno = devno; 405 int i; 406 407 /* allow n.15/16 for devices attached to host port */ 408 if (ata_is_host_link(dev->link)) 409 alt_devno += 15; 410 411 for (i = ata_force_tbl_size - 1; i >= 0; i--) { 412 const struct ata_force_ent *fe = &ata_force_tbl[i]; 413 unsigned long pio_mask, mwdma_mask, udma_mask; 414 415 if (fe->port != -1 && fe->port != dev->link->ap->print_id) 416 continue; 417 418 if (fe->device != -1 && fe->device != devno && 419 fe->device != alt_devno) 420 continue; 421 422 if (!fe->param.xfer_mask) 423 continue; 424 425 ata_unpack_xfermask(fe->param.xfer_mask, 426 &pio_mask, &mwdma_mask, &udma_mask); 427 if (udma_mask) 428 dev->udma_mask = udma_mask; 429 else if (mwdma_mask) { 430 dev->udma_mask = 0; 431 dev->mwdma_mask = mwdma_mask; 432 } else { 433 dev->udma_mask = 0; 434 dev->mwdma_mask = 0; 435 dev->pio_mask = pio_mask; 436 } 437 438 ata_dev_printk(dev, KERN_NOTICE, 439 "FORCE: xfer_mask set to %s\n", fe->param.name); 440 return; 441 } 442 } 443 444 /** 445 * ata_force_horkage - force horkage according to libata.force 446 * @dev: ATA device of interest 447 * 448 * Force horkage according to libata.force and whine about it. 449 * For consistency with link selection, device number 15 selects 450 * the first device connected to the host link. 451 * 452 * LOCKING: 453 * EH context. 454 */ 455 static void ata_force_horkage(struct ata_device *dev) 456 { 457 int devno = dev->link->pmp + dev->devno; 458 int alt_devno = devno; 459 int i; 460 461 /* allow n.15/16 for devices attached to host port */ 462 if (ata_is_host_link(dev->link)) 463 alt_devno += 15; 464 465 for (i = 0; i < ata_force_tbl_size; i++) { 466 const struct ata_force_ent *fe = &ata_force_tbl[i]; 467 468 if (fe->port != -1 && fe->port != dev->link->ap->print_id) 469 continue; 470 471 if (fe->device != -1 && fe->device != devno && 472 fe->device != alt_devno) 473 continue; 474 475 if (!(~dev->horkage & fe->param.horkage_on) && 476 !(dev->horkage & fe->param.horkage_off)) 477 continue; 478 479 dev->horkage |= fe->param.horkage_on; 480 dev->horkage &= ~fe->param.horkage_off; 481 482 ata_dev_printk(dev, KERN_NOTICE, 483 "FORCE: horkage modified (%s)\n", fe->param.name); 484 } 485 } 486 487 /** 488 * atapi_cmd_type - Determine ATAPI command type from SCSI opcode 489 * @opcode: SCSI opcode 490 * 491 * Determine ATAPI command type from @opcode. 492 * 493 * LOCKING: 494 * None. 495 * 496 * RETURNS: 497 * ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC} 498 */ 499 int atapi_cmd_type(u8 opcode) 500 { 501 switch (opcode) { 502 case GPCMD_READ_10: 503 case GPCMD_READ_12: 504 return ATAPI_READ; 505 506 case GPCMD_WRITE_10: 507 case GPCMD_WRITE_12: 508 case GPCMD_WRITE_AND_VERIFY_10: 509 return ATAPI_WRITE; 510 511 case GPCMD_READ_CD: 512 case GPCMD_READ_CD_MSF: 513 return ATAPI_READ_CD; 514 515 case ATA_16: 516 case ATA_12: 517 if (atapi_passthru16) 518 return ATAPI_PASS_THRU; 519 /* fall thru */ 520 default: 521 return ATAPI_MISC; 522 } 523 } 524 525 /** 526 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure 527 * @tf: Taskfile to convert 528 * @pmp: Port multiplier port 529 * @is_cmd: This FIS is for command 530 * @fis: Buffer into which data will output 531 * 532 * Converts a standard ATA taskfile to a Serial ATA 533 * FIS structure (Register - Host to Device). 534 * 535 * LOCKING: 536 * Inherited from caller. 537 */ 538 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis) 539 { 540 fis[0] = 0x27; /* Register - Host to Device FIS */ 541 fis[1] = pmp & 0xf; /* Port multiplier number*/ 542 if (is_cmd) 543 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */ 544 545 fis[2] = tf->command; 546 fis[3] = tf->feature; 547 548 fis[4] = tf->lbal; 549 fis[5] = tf->lbam; 550 fis[6] = tf->lbah; 551 fis[7] = tf->device; 552 553 fis[8] = tf->hob_lbal; 554 fis[9] = tf->hob_lbam; 555 fis[10] = tf->hob_lbah; 556 fis[11] = tf->hob_feature; 557 558 fis[12] = tf->nsect; 559 fis[13] = tf->hob_nsect; 560 fis[14] = 0; 561 fis[15] = tf->ctl; 562 563 fis[16] = 0; 564 fis[17] = 0; 565 fis[18] = 0; 566 fis[19] = 0; 567 } 568 569 /** 570 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile 571 * @fis: Buffer from which data will be input 572 * @tf: Taskfile to output 573 * 574 * Converts a serial ATA FIS structure to a standard ATA taskfile. 575 * 576 * LOCKING: 577 * Inherited from caller. 578 */ 579 580 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf) 581 { 582 tf->command = fis[2]; /* status */ 583 tf->feature = fis[3]; /* error */ 584 585 tf->lbal = fis[4]; 586 tf->lbam = fis[5]; 587 tf->lbah = fis[6]; 588 tf->device = fis[7]; 589 590 tf->hob_lbal = fis[8]; 591 tf->hob_lbam = fis[9]; 592 tf->hob_lbah = fis[10]; 593 594 tf->nsect = fis[12]; 595 tf->hob_nsect = fis[13]; 596 } 597 598 static const u8 ata_rw_cmds[] = { 599 /* pio multi */ 600 ATA_CMD_READ_MULTI, 601 ATA_CMD_WRITE_MULTI, 602 ATA_CMD_READ_MULTI_EXT, 603 ATA_CMD_WRITE_MULTI_EXT, 604 0, 605 0, 606 0, 607 ATA_CMD_WRITE_MULTI_FUA_EXT, 608 /* pio */ 609 ATA_CMD_PIO_READ, 610 ATA_CMD_PIO_WRITE, 611 ATA_CMD_PIO_READ_EXT, 612 ATA_CMD_PIO_WRITE_EXT, 613 0, 614 0, 615 0, 616 0, 617 /* dma */ 618 ATA_CMD_READ, 619 ATA_CMD_WRITE, 620 ATA_CMD_READ_EXT, 621 ATA_CMD_WRITE_EXT, 622 0, 623 0, 624 0, 625 ATA_CMD_WRITE_FUA_EXT 626 }; 627 628 /** 629 * ata_rwcmd_protocol - set taskfile r/w commands and protocol 630 * @tf: command to examine and configure 631 * @dev: device tf belongs to 632 * 633 * Examine the device configuration and tf->flags to calculate 634 * the proper read/write commands and protocol to use. 635 * 636 * LOCKING: 637 * caller. 638 */ 639 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev) 640 { 641 u8 cmd; 642 643 int index, fua, lba48, write; 644 645 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0; 646 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0; 647 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0; 648 649 if (dev->flags & ATA_DFLAG_PIO) { 650 tf->protocol = ATA_PROT_PIO; 651 index = dev->multi_count ? 0 : 8; 652 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) { 653 /* Unable to use DMA due to host limitation */ 654 tf->protocol = ATA_PROT_PIO; 655 index = dev->multi_count ? 0 : 8; 656 } else { 657 tf->protocol = ATA_PROT_DMA; 658 index = 16; 659 } 660 661 cmd = ata_rw_cmds[index + fua + lba48 + write]; 662 if (cmd) { 663 tf->command = cmd; 664 return 0; 665 } 666 return -1; 667 } 668 669 /** 670 * ata_tf_read_block - Read block address from ATA taskfile 671 * @tf: ATA taskfile of interest 672 * @dev: ATA device @tf belongs to 673 * 674 * LOCKING: 675 * None. 676 * 677 * Read block address from @tf. This function can handle all 678 * three address formats - LBA, LBA48 and CHS. tf->protocol and 679 * flags select the address format to use. 680 * 681 * RETURNS: 682 * Block address read from @tf. 683 */ 684 u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev) 685 { 686 u64 block = 0; 687 688 if (tf->flags & ATA_TFLAG_LBA) { 689 if (tf->flags & ATA_TFLAG_LBA48) { 690 block |= (u64)tf->hob_lbah << 40; 691 block |= (u64)tf->hob_lbam << 32; 692 block |= (u64)tf->hob_lbal << 24; 693 } else 694 block |= (tf->device & 0xf) << 24; 695 696 block |= tf->lbah << 16; 697 block |= tf->lbam << 8; 698 block |= tf->lbal; 699 } else { 700 u32 cyl, head, sect; 701 702 cyl = tf->lbam | (tf->lbah << 8); 703 head = tf->device & 0xf; 704 sect = tf->lbal; 705 706 block = (cyl * dev->heads + head) * dev->sectors + sect; 707 } 708 709 return block; 710 } 711 712 /** 713 * ata_build_rw_tf - Build ATA taskfile for given read/write request 714 * @tf: Target ATA taskfile 715 * @dev: ATA device @tf belongs to 716 * @block: Block address 717 * @n_block: Number of blocks 718 * @tf_flags: RW/FUA etc... 719 * @tag: tag 720 * 721 * LOCKING: 722 * None. 723 * 724 * Build ATA taskfile @tf for read/write request described by 725 * @block, @n_block, @tf_flags and @tag on @dev. 726 * 727 * RETURNS: 728 * 729 * 0 on success, -ERANGE if the request is too large for @dev, 730 * -EINVAL if the request is invalid. 731 */ 732 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev, 733 u64 block, u32 n_block, unsigned int tf_flags, 734 unsigned int tag) 735 { 736 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 737 tf->flags |= tf_flags; 738 739 if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) { 740 /* yay, NCQ */ 741 if (!lba_48_ok(block, n_block)) 742 return -ERANGE; 743 744 tf->protocol = ATA_PROT_NCQ; 745 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48; 746 747 if (tf->flags & ATA_TFLAG_WRITE) 748 tf->command = ATA_CMD_FPDMA_WRITE; 749 else 750 tf->command = ATA_CMD_FPDMA_READ; 751 752 tf->nsect = tag << 3; 753 tf->hob_feature = (n_block >> 8) & 0xff; 754 tf->feature = n_block & 0xff; 755 756 tf->hob_lbah = (block >> 40) & 0xff; 757 tf->hob_lbam = (block >> 32) & 0xff; 758 tf->hob_lbal = (block >> 24) & 0xff; 759 tf->lbah = (block >> 16) & 0xff; 760 tf->lbam = (block >> 8) & 0xff; 761 tf->lbal = block & 0xff; 762 763 tf->device = 1 << 6; 764 if (tf->flags & ATA_TFLAG_FUA) 765 tf->device |= 1 << 7; 766 } else if (dev->flags & ATA_DFLAG_LBA) { 767 tf->flags |= ATA_TFLAG_LBA; 768 769 if (lba_28_ok(block, n_block)) { 770 /* use LBA28 */ 771 tf->device |= (block >> 24) & 0xf; 772 } else if (lba_48_ok(block, n_block)) { 773 if (!(dev->flags & ATA_DFLAG_LBA48)) 774 return -ERANGE; 775 776 /* use LBA48 */ 777 tf->flags |= ATA_TFLAG_LBA48; 778 779 tf->hob_nsect = (n_block >> 8) & 0xff; 780 781 tf->hob_lbah = (block >> 40) & 0xff; 782 tf->hob_lbam = (block >> 32) & 0xff; 783 tf->hob_lbal = (block >> 24) & 0xff; 784 } else 785 /* request too large even for LBA48 */ 786 return -ERANGE; 787 788 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0)) 789 return -EINVAL; 790 791 tf->nsect = n_block & 0xff; 792 793 tf->lbah = (block >> 16) & 0xff; 794 tf->lbam = (block >> 8) & 0xff; 795 tf->lbal = block & 0xff; 796 797 tf->device |= ATA_LBA; 798 } else { 799 /* CHS */ 800 u32 sect, head, cyl, track; 801 802 /* The request -may- be too large for CHS addressing. */ 803 if (!lba_28_ok(block, n_block)) 804 return -ERANGE; 805 806 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0)) 807 return -EINVAL; 808 809 /* Convert LBA to CHS */ 810 track = (u32)block / dev->sectors; 811 cyl = track / dev->heads; 812 head = track % dev->heads; 813 sect = (u32)block % dev->sectors + 1; 814 815 DPRINTK("block %u track %u cyl %u head %u sect %u\n", 816 (u32)block, track, cyl, head, sect); 817 818 /* Check whether the converted CHS can fit. 819 Cylinder: 0-65535 820 Head: 0-15 821 Sector: 1-255*/ 822 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 823 return -ERANGE; 824 825 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ 826 tf->lbal = sect; 827 tf->lbam = cyl; 828 tf->lbah = cyl >> 8; 829 tf->device |= head; 830 } 831 832 return 0; 833 } 834 835 /** 836 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask 837 * @pio_mask: pio_mask 838 * @mwdma_mask: mwdma_mask 839 * @udma_mask: udma_mask 840 * 841 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single 842 * unsigned int xfer_mask. 843 * 844 * LOCKING: 845 * None. 846 * 847 * RETURNS: 848 * Packed xfer_mask. 849 */ 850 unsigned long ata_pack_xfermask(unsigned long pio_mask, 851 unsigned long mwdma_mask, 852 unsigned long udma_mask) 853 { 854 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) | 855 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) | 856 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA); 857 } 858 859 /** 860 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks 861 * @xfer_mask: xfer_mask to unpack 862 * @pio_mask: resulting pio_mask 863 * @mwdma_mask: resulting mwdma_mask 864 * @udma_mask: resulting udma_mask 865 * 866 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask. 867 * Any NULL distination masks will be ignored. 868 */ 869 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask, 870 unsigned long *mwdma_mask, unsigned long *udma_mask) 871 { 872 if (pio_mask) 873 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO; 874 if (mwdma_mask) 875 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA; 876 if (udma_mask) 877 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA; 878 } 879 880 static const struct ata_xfer_ent { 881 int shift, bits; 882 u8 base; 883 } ata_xfer_tbl[] = { 884 { ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 }, 885 { ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 }, 886 { ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 }, 887 { -1, }, 888 }; 889 890 /** 891 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask 892 * @xfer_mask: xfer_mask of interest 893 * 894 * Return matching XFER_* value for @xfer_mask. Only the highest 895 * bit of @xfer_mask is considered. 896 * 897 * LOCKING: 898 * None. 899 * 900 * RETURNS: 901 * Matching XFER_* value, 0xff if no match found. 902 */ 903 u8 ata_xfer_mask2mode(unsigned long xfer_mask) 904 { 905 int highbit = fls(xfer_mask) - 1; 906 const struct ata_xfer_ent *ent; 907 908 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++) 909 if (highbit >= ent->shift && highbit < ent->shift + ent->bits) 910 return ent->base + highbit - ent->shift; 911 return 0xff; 912 } 913 914 /** 915 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_* 916 * @xfer_mode: XFER_* of interest 917 * 918 * Return matching xfer_mask for @xfer_mode. 919 * 920 * LOCKING: 921 * None. 922 * 923 * RETURNS: 924 * Matching xfer_mask, 0 if no match found. 925 */ 926 unsigned long ata_xfer_mode2mask(u8 xfer_mode) 927 { 928 const struct ata_xfer_ent *ent; 929 930 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++) 931 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits) 932 return ((2 << (ent->shift + xfer_mode - ent->base)) - 1) 933 & ~((1 << ent->shift) - 1); 934 return 0; 935 } 936 937 /** 938 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_* 939 * @xfer_mode: XFER_* of interest 940 * 941 * Return matching xfer_shift for @xfer_mode. 942 * 943 * LOCKING: 944 * None. 945 * 946 * RETURNS: 947 * Matching xfer_shift, -1 if no match found. 948 */ 949 int ata_xfer_mode2shift(unsigned long xfer_mode) 950 { 951 const struct ata_xfer_ent *ent; 952 953 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++) 954 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits) 955 return ent->shift; 956 return -1; 957 } 958 959 /** 960 * ata_mode_string - convert xfer_mask to string 961 * @xfer_mask: mask of bits supported; only highest bit counts. 962 * 963 * Determine string which represents the highest speed 964 * (highest bit in @modemask). 965 * 966 * LOCKING: 967 * None. 968 * 969 * RETURNS: 970 * Constant C string representing highest speed listed in 971 * @mode_mask, or the constant C string "<n/a>". 972 */ 973 const char *ata_mode_string(unsigned long xfer_mask) 974 { 975 static const char * const xfer_mode_str[] = { 976 "PIO0", 977 "PIO1", 978 "PIO2", 979 "PIO3", 980 "PIO4", 981 "PIO5", 982 "PIO6", 983 "MWDMA0", 984 "MWDMA1", 985 "MWDMA2", 986 "MWDMA3", 987 "MWDMA4", 988 "UDMA/16", 989 "UDMA/25", 990 "UDMA/33", 991 "UDMA/44", 992 "UDMA/66", 993 "UDMA/100", 994 "UDMA/133", 995 "UDMA7", 996 }; 997 int highbit; 998 999 highbit = fls(xfer_mask) - 1; 1000 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str)) 1001 return xfer_mode_str[highbit]; 1002 return "<n/a>"; 1003 } 1004 1005 static const char *sata_spd_string(unsigned int spd) 1006 { 1007 static const char * const spd_str[] = { 1008 "1.5 Gbps", 1009 "3.0 Gbps", 1010 "6.0 Gbps", 1011 }; 1012 1013 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str)) 1014 return "<unknown>"; 1015 return spd_str[spd - 1]; 1016 } 1017 1018 void ata_dev_disable(struct ata_device *dev) 1019 { 1020 if (ata_dev_enabled(dev)) { 1021 if (ata_msg_drv(dev->link->ap)) 1022 ata_dev_printk(dev, KERN_WARNING, "disabled\n"); 1023 ata_acpi_on_disable(dev); 1024 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 | 1025 ATA_DNXFER_QUIET); 1026 dev->class++; 1027 } 1028 } 1029 1030 static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy) 1031 { 1032 struct ata_link *link = dev->link; 1033 struct ata_port *ap = link->ap; 1034 u32 scontrol; 1035 unsigned int err_mask; 1036 int rc; 1037 1038 /* 1039 * disallow DIPM for drivers which haven't set 1040 * ATA_FLAG_IPM. This is because when DIPM is enabled, 1041 * phy ready will be set in the interrupt status on 1042 * state changes, which will cause some drivers to 1043 * think there are errors - additionally drivers will 1044 * need to disable hot plug. 1045 */ 1046 if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) { 1047 ap->pm_policy = NOT_AVAILABLE; 1048 return -EINVAL; 1049 } 1050 1051 /* 1052 * For DIPM, we will only enable it for the 1053 * min_power setting. 1054 * 1055 * Why? Because Disks are too stupid to know that 1056 * If the host rejects a request to go to SLUMBER 1057 * they should retry at PARTIAL, and instead it 1058 * just would give up. So, for medium_power to 1059 * work at all, we need to only allow HIPM. 1060 */ 1061 rc = sata_scr_read(link, SCR_CONTROL, &scontrol); 1062 if (rc) 1063 return rc; 1064 1065 switch (policy) { 1066 case MIN_POWER: 1067 /* no restrictions on IPM transitions */ 1068 scontrol &= ~(0x3 << 8); 1069 rc = sata_scr_write(link, SCR_CONTROL, scontrol); 1070 if (rc) 1071 return rc; 1072 1073 /* enable DIPM */ 1074 if (dev->flags & ATA_DFLAG_DIPM) 1075 err_mask = ata_dev_set_feature(dev, 1076 SETFEATURES_SATA_ENABLE, SATA_DIPM); 1077 break; 1078 case MEDIUM_POWER: 1079 /* allow IPM to PARTIAL */ 1080 scontrol &= ~(0x1 << 8); 1081 scontrol |= (0x2 << 8); 1082 rc = sata_scr_write(link, SCR_CONTROL, scontrol); 1083 if (rc) 1084 return rc; 1085 1086 /* 1087 * we don't have to disable DIPM since IPM flags 1088 * disallow transitions to SLUMBER, which effectively 1089 * disable DIPM if it does not support PARTIAL 1090 */ 1091 break; 1092 case NOT_AVAILABLE: 1093 case MAX_PERFORMANCE: 1094 /* disable all IPM transitions */ 1095 scontrol |= (0x3 << 8); 1096 rc = sata_scr_write(link, SCR_CONTROL, scontrol); 1097 if (rc) 1098 return rc; 1099 1100 /* 1101 * we don't have to disable DIPM since IPM flags 1102 * disallow all transitions which effectively 1103 * disable DIPM anyway. 1104 */ 1105 break; 1106 } 1107 1108 /* FIXME: handle SET FEATURES failure */ 1109 (void) err_mask; 1110 1111 return 0; 1112 } 1113 1114 /** 1115 * ata_dev_enable_pm - enable SATA interface power management 1116 * @dev: device to enable power management 1117 * @policy: the link power management policy 1118 * 1119 * Enable SATA Interface power management. This will enable 1120 * Device Interface Power Management (DIPM) for min_power 1121 * policy, and then call driver specific callbacks for 1122 * enabling Host Initiated Power management. 1123 * 1124 * Locking: Caller. 1125 * Returns: -EINVAL if IPM is not supported, 0 otherwise. 1126 */ 1127 void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy) 1128 { 1129 int rc = 0; 1130 struct ata_port *ap = dev->link->ap; 1131 1132 /* set HIPM first, then DIPM */ 1133 if (ap->ops->enable_pm) 1134 rc = ap->ops->enable_pm(ap, policy); 1135 if (rc) 1136 goto enable_pm_out; 1137 rc = ata_dev_set_dipm(dev, policy); 1138 1139 enable_pm_out: 1140 if (rc) 1141 ap->pm_policy = MAX_PERFORMANCE; 1142 else 1143 ap->pm_policy = policy; 1144 return /* rc */; /* hopefully we can use 'rc' eventually */ 1145 } 1146 1147 #ifdef CONFIG_PM 1148 /** 1149 * ata_dev_disable_pm - disable SATA interface power management 1150 * @dev: device to disable power management 1151 * 1152 * Disable SATA Interface power management. This will disable 1153 * Device Interface Power Management (DIPM) without changing 1154 * policy, call driver specific callbacks for disabling Host 1155 * Initiated Power management. 1156 * 1157 * Locking: Caller. 1158 * Returns: void 1159 */ 1160 static void ata_dev_disable_pm(struct ata_device *dev) 1161 { 1162 struct ata_port *ap = dev->link->ap; 1163 1164 ata_dev_set_dipm(dev, MAX_PERFORMANCE); 1165 if (ap->ops->disable_pm) 1166 ap->ops->disable_pm(ap); 1167 } 1168 #endif /* CONFIG_PM */ 1169 1170 void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy) 1171 { 1172 ap->pm_policy = policy; 1173 ap->link.eh_info.action |= ATA_EH_LPM; 1174 ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY; 1175 ata_port_schedule_eh(ap); 1176 } 1177 1178 #ifdef CONFIG_PM 1179 static void ata_lpm_enable(struct ata_host *host) 1180 { 1181 struct ata_link *link; 1182 struct ata_port *ap; 1183 struct ata_device *dev; 1184 int i; 1185 1186 for (i = 0; i < host->n_ports; i++) { 1187 ap = host->ports[i]; 1188 ata_for_each_link(link, ap, EDGE) { 1189 ata_for_each_dev(dev, link, ALL) 1190 ata_dev_disable_pm(dev); 1191 } 1192 } 1193 } 1194 1195 static void ata_lpm_disable(struct ata_host *host) 1196 { 1197 int i; 1198 1199 for (i = 0; i < host->n_ports; i++) { 1200 struct ata_port *ap = host->ports[i]; 1201 ata_lpm_schedule(ap, ap->pm_policy); 1202 } 1203 } 1204 #endif /* CONFIG_PM */ 1205 1206 /** 1207 * ata_dev_classify - determine device type based on ATA-spec signature 1208 * @tf: ATA taskfile register set for device to be identified 1209 * 1210 * Determine from taskfile register contents whether a device is 1211 * ATA or ATAPI, as per "Signature and persistence" section 1212 * of ATA/PI spec (volume 1, sect 5.14). 1213 * 1214 * LOCKING: 1215 * None. 1216 * 1217 * RETURNS: 1218 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or 1219 * %ATA_DEV_UNKNOWN the event of failure. 1220 */ 1221 unsigned int ata_dev_classify(const struct ata_taskfile *tf) 1222 { 1223 /* Apple's open source Darwin code hints that some devices only 1224 * put a proper signature into the LBA mid/high registers, 1225 * So, we only check those. It's sufficient for uniqueness. 1226 * 1227 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate 1228 * signatures for ATA and ATAPI devices attached on SerialATA, 1229 * 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA 1230 * spec has never mentioned about using different signatures 1231 * for ATA/ATAPI devices. Then, Serial ATA II: Port 1232 * Multiplier specification began to use 0x69/0x96 to identify 1233 * port multpliers and 0x3c/0xc3 to identify SEMB device. 1234 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and 1235 * 0x69/0x96 shortly and described them as reserved for 1236 * SerialATA. 1237 * 1238 * We follow the current spec and consider that 0x69/0x96 1239 * identifies a port multiplier and 0x3c/0xc3 a SEMB device. 1240 */ 1241 if ((tf->lbam == 0) && (tf->lbah == 0)) { 1242 DPRINTK("found ATA device by sig\n"); 1243 return ATA_DEV_ATA; 1244 } 1245 1246 if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) { 1247 DPRINTK("found ATAPI device by sig\n"); 1248 return ATA_DEV_ATAPI; 1249 } 1250 1251 if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) { 1252 DPRINTK("found PMP device by sig\n"); 1253 return ATA_DEV_PMP; 1254 } 1255 1256 if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) { 1257 printk(KERN_INFO "ata: SEMB device ignored\n"); 1258 return ATA_DEV_SEMB_UNSUP; /* not yet */ 1259 } 1260 1261 DPRINTK("unknown device\n"); 1262 return ATA_DEV_UNKNOWN; 1263 } 1264 1265 /** 1266 * ata_id_string - Convert IDENTIFY DEVICE page into string 1267 * @id: IDENTIFY DEVICE results we will examine 1268 * @s: string into which data is output 1269 * @ofs: offset into identify device page 1270 * @len: length of string to return. must be an even number. 1271 * 1272 * The strings in the IDENTIFY DEVICE page are broken up into 1273 * 16-bit chunks. Run through the string, and output each 1274 * 8-bit chunk linearly, regardless of platform. 1275 * 1276 * LOCKING: 1277 * caller. 1278 */ 1279 1280 void ata_id_string(const u16 *id, unsigned char *s, 1281 unsigned int ofs, unsigned int len) 1282 { 1283 unsigned int c; 1284 1285 BUG_ON(len & 1); 1286 1287 while (len > 0) { 1288 c = id[ofs] >> 8; 1289 *s = c; 1290 s++; 1291 1292 c = id[ofs] & 0xff; 1293 *s = c; 1294 s++; 1295 1296 ofs++; 1297 len -= 2; 1298 } 1299 } 1300 1301 /** 1302 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string 1303 * @id: IDENTIFY DEVICE results we will examine 1304 * @s: string into which data is output 1305 * @ofs: offset into identify device page 1306 * @len: length of string to return. must be an odd number. 1307 * 1308 * This function is identical to ata_id_string except that it 1309 * trims trailing spaces and terminates the resulting string with 1310 * null. @len must be actual maximum length (even number) + 1. 1311 * 1312 * LOCKING: 1313 * caller. 1314 */ 1315 void ata_id_c_string(const u16 *id, unsigned char *s, 1316 unsigned int ofs, unsigned int len) 1317 { 1318 unsigned char *p; 1319 1320 ata_id_string(id, s, ofs, len - 1); 1321 1322 p = s + strnlen(s, len - 1); 1323 while (p > s && p[-1] == ' ') 1324 p--; 1325 *p = '\0'; 1326 } 1327 1328 static u64 ata_id_n_sectors(const u16 *id) 1329 { 1330 if (ata_id_has_lba(id)) { 1331 if (ata_id_has_lba48(id)) 1332 return ata_id_u64(id, 100); 1333 else 1334 return ata_id_u32(id, 60); 1335 } else { 1336 if (ata_id_current_chs_valid(id)) 1337 return ata_id_u32(id, 57); 1338 else 1339 return id[1] * id[3] * id[6]; 1340 } 1341 } 1342 1343 u64 ata_tf_to_lba48(const struct ata_taskfile *tf) 1344 { 1345 u64 sectors = 0; 1346 1347 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40; 1348 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32; 1349 sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24; 1350 sectors |= (tf->lbah & 0xff) << 16; 1351 sectors |= (tf->lbam & 0xff) << 8; 1352 sectors |= (tf->lbal & 0xff); 1353 1354 return sectors; 1355 } 1356 1357 u64 ata_tf_to_lba(const struct ata_taskfile *tf) 1358 { 1359 u64 sectors = 0; 1360 1361 sectors |= (tf->device & 0x0f) << 24; 1362 sectors |= (tf->lbah & 0xff) << 16; 1363 sectors |= (tf->lbam & 0xff) << 8; 1364 sectors |= (tf->lbal & 0xff); 1365 1366 return sectors; 1367 } 1368 1369 /** 1370 * ata_read_native_max_address - Read native max address 1371 * @dev: target device 1372 * @max_sectors: out parameter for the result native max address 1373 * 1374 * Perform an LBA48 or LBA28 native size query upon the device in 1375 * question. 1376 * 1377 * RETURNS: 1378 * 0 on success, -EACCES if command is aborted by the drive. 1379 * -EIO on other errors. 1380 */ 1381 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors) 1382 { 1383 unsigned int err_mask; 1384 struct ata_taskfile tf; 1385 int lba48 = ata_id_has_lba48(dev->id); 1386 1387 ata_tf_init(dev, &tf); 1388 1389 /* always clear all address registers */ 1390 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1391 1392 if (lba48) { 1393 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT; 1394 tf.flags |= ATA_TFLAG_LBA48; 1395 } else 1396 tf.command = ATA_CMD_READ_NATIVE_MAX; 1397 1398 tf.protocol |= ATA_PROT_NODATA; 1399 tf.device |= ATA_LBA; 1400 1401 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0); 1402 if (err_mask) { 1403 ata_dev_printk(dev, KERN_WARNING, "failed to read native " 1404 "max address (err_mask=0x%x)\n", err_mask); 1405 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED)) 1406 return -EACCES; 1407 return -EIO; 1408 } 1409 1410 if (lba48) 1411 *max_sectors = ata_tf_to_lba48(&tf) + 1; 1412 else 1413 *max_sectors = ata_tf_to_lba(&tf) + 1; 1414 if (dev->horkage & ATA_HORKAGE_HPA_SIZE) 1415 (*max_sectors)--; 1416 return 0; 1417 } 1418 1419 /** 1420 * ata_set_max_sectors - Set max sectors 1421 * @dev: target device 1422 * @new_sectors: new max sectors value to set for the device 1423 * 1424 * Set max sectors of @dev to @new_sectors. 1425 * 1426 * RETURNS: 1427 * 0 on success, -EACCES if command is aborted or denied (due to 1428 * previous non-volatile SET_MAX) by the drive. -EIO on other 1429 * errors. 1430 */ 1431 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors) 1432 { 1433 unsigned int err_mask; 1434 struct ata_taskfile tf; 1435 int lba48 = ata_id_has_lba48(dev->id); 1436 1437 new_sectors--; 1438 1439 ata_tf_init(dev, &tf); 1440 1441 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; 1442 1443 if (lba48) { 1444 tf.command = ATA_CMD_SET_MAX_EXT; 1445 tf.flags |= ATA_TFLAG_LBA48; 1446 1447 tf.hob_lbal = (new_sectors >> 24) & 0xff; 1448 tf.hob_lbam = (new_sectors >> 32) & 0xff; 1449 tf.hob_lbah = (new_sectors >> 40) & 0xff; 1450 } else { 1451 tf.command = ATA_CMD_SET_MAX; 1452 1453 tf.device |= (new_sectors >> 24) & 0xf; 1454 } 1455 1456 tf.protocol |= ATA_PROT_NODATA; 1457 tf.device |= ATA_LBA; 1458 1459 tf.lbal = (new_sectors >> 0) & 0xff; 1460 tf.lbam = (new_sectors >> 8) & 0xff; 1461 tf.lbah = (new_sectors >> 16) & 0xff; 1462 1463 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0); 1464 if (err_mask) { 1465 ata_dev_printk(dev, KERN_WARNING, "failed to set " 1466 "max address (err_mask=0x%x)\n", err_mask); 1467 if (err_mask == AC_ERR_DEV && 1468 (tf.feature & (ATA_ABORTED | ATA_IDNF))) 1469 return -EACCES; 1470 return -EIO; 1471 } 1472 1473 return 0; 1474 } 1475 1476 /** 1477 * ata_hpa_resize - Resize a device with an HPA set 1478 * @dev: Device to resize 1479 * 1480 * Read the size of an LBA28 or LBA48 disk with HPA features and resize 1481 * it if required to the full size of the media. The caller must check 1482 * the drive has the HPA feature set enabled. 1483 * 1484 * RETURNS: 1485 * 0 on success, -errno on failure. 1486 */ 1487 static int ata_hpa_resize(struct ata_device *dev) 1488 { 1489 struct ata_eh_context *ehc = &dev->link->eh_context; 1490 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO; 1491 u64 sectors = ata_id_n_sectors(dev->id); 1492 u64 native_sectors; 1493 int rc; 1494 1495 /* do we need to do it? */ 1496 if (dev->class != ATA_DEV_ATA || 1497 !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) || 1498 (dev->horkage & ATA_HORKAGE_BROKEN_HPA)) 1499 return 0; 1500 1501 /* read native max address */ 1502 rc = ata_read_native_max_address(dev, &native_sectors); 1503 if (rc) { 1504 /* If device aborted the command or HPA isn't going to 1505 * be unlocked, skip HPA resizing. 1506 */ 1507 if (rc == -EACCES || !ata_ignore_hpa) { 1508 ata_dev_printk(dev, KERN_WARNING, "HPA support seems " 1509 "broken, skipping HPA handling\n"); 1510 dev->horkage |= ATA_HORKAGE_BROKEN_HPA; 1511 1512 /* we can continue if device aborted the command */ 1513 if (rc == -EACCES) 1514 rc = 0; 1515 } 1516 1517 return rc; 1518 } 1519 1520 /* nothing to do? */ 1521 if (native_sectors <= sectors || !ata_ignore_hpa) { 1522 if (!print_info || native_sectors == sectors) 1523 return 0; 1524 1525 if (native_sectors > sectors) 1526 ata_dev_printk(dev, KERN_INFO, 1527 "HPA detected: current %llu, native %llu\n", 1528 (unsigned long long)sectors, 1529 (unsigned long long)native_sectors); 1530 else if (native_sectors < sectors) 1531 ata_dev_printk(dev, KERN_WARNING, 1532 "native sectors (%llu) is smaller than " 1533 "sectors (%llu)\n", 1534 (unsigned long long)native_sectors, 1535 (unsigned long long)sectors); 1536 return 0; 1537 } 1538 1539 /* let's unlock HPA */ 1540 rc = ata_set_max_sectors(dev, native_sectors); 1541 if (rc == -EACCES) { 1542 /* if device aborted the command, skip HPA resizing */ 1543 ata_dev_printk(dev, KERN_WARNING, "device aborted resize " 1544 "(%llu -> %llu), skipping HPA handling\n", 1545 (unsigned long long)sectors, 1546 (unsigned long long)native_sectors); 1547 dev->horkage |= ATA_HORKAGE_BROKEN_HPA; 1548 return 0; 1549 } else if (rc) 1550 return rc; 1551 1552 /* re-read IDENTIFY data */ 1553 rc = ata_dev_reread_id(dev, 0); 1554 if (rc) { 1555 ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY " 1556 "data after HPA resizing\n"); 1557 return rc; 1558 } 1559 1560 if (print_info) { 1561 u64 new_sectors = ata_id_n_sectors(dev->id); 1562 ata_dev_printk(dev, KERN_INFO, 1563 "HPA unlocked: %llu -> %llu, native %llu\n", 1564 (unsigned long long)sectors, 1565 (unsigned long long)new_sectors, 1566 (unsigned long long)native_sectors); 1567 } 1568 1569 return 0; 1570 } 1571 1572 /** 1573 * ata_dump_id - IDENTIFY DEVICE info debugging output 1574 * @id: IDENTIFY DEVICE page to dump 1575 * 1576 * Dump selected 16-bit words from the given IDENTIFY DEVICE 1577 * page. 1578 * 1579 * LOCKING: 1580 * caller. 1581 */ 1582 1583 static inline void ata_dump_id(const u16 *id) 1584 { 1585 DPRINTK("49==0x%04x " 1586 "53==0x%04x " 1587 "63==0x%04x " 1588 "64==0x%04x " 1589 "75==0x%04x \n", 1590 id[49], 1591 id[53], 1592 id[63], 1593 id[64], 1594 id[75]); 1595 DPRINTK("80==0x%04x " 1596 "81==0x%04x " 1597 "82==0x%04x " 1598 "83==0x%04x " 1599 "84==0x%04x \n", 1600 id[80], 1601 id[81], 1602 id[82], 1603 id[83], 1604 id[84]); 1605 DPRINTK("88==0x%04x " 1606 "93==0x%04x\n", 1607 id[88], 1608 id[93]); 1609 } 1610 1611 /** 1612 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data 1613 * @id: IDENTIFY data to compute xfer mask from 1614 * 1615 * Compute the xfermask for this device. This is not as trivial 1616 * as it seems if we must consider early devices correctly. 1617 * 1618 * FIXME: pre IDE drive timing (do we care ?). 1619 * 1620 * LOCKING: 1621 * None. 1622 * 1623 * RETURNS: 1624 * Computed xfermask 1625 */ 1626 unsigned long ata_id_xfermask(const u16 *id) 1627 { 1628 unsigned long pio_mask, mwdma_mask, udma_mask; 1629 1630 /* Usual case. Word 53 indicates word 64 is valid */ 1631 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) { 1632 pio_mask = id[ATA_ID_PIO_MODES] & 0x03; 1633 pio_mask <<= 3; 1634 pio_mask |= 0x7; 1635 } else { 1636 /* If word 64 isn't valid then Word 51 high byte holds 1637 * the PIO timing number for the maximum. Turn it into 1638 * a mask. 1639 */ 1640 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF; 1641 if (mode < 5) /* Valid PIO range */ 1642 pio_mask = (2 << mode) - 1; 1643 else 1644 pio_mask = 1; 1645 1646 /* But wait.. there's more. Design your standards by 1647 * committee and you too can get a free iordy field to 1648 * process. However its the speeds not the modes that 1649 * are supported... Note drivers using the timing API 1650 * will get this right anyway 1651 */ 1652 } 1653 1654 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07; 1655 1656 if (ata_id_is_cfa(id)) { 1657 /* 1658 * Process compact flash extended modes 1659 */ 1660 int pio = id[163] & 0x7; 1661 int dma = (id[163] >> 3) & 7; 1662 1663 if (pio) 1664 pio_mask |= (1 << 5); 1665 if (pio > 1) 1666 pio_mask |= (1 << 6); 1667 if (dma) 1668 mwdma_mask |= (1 << 3); 1669 if (dma > 1) 1670 mwdma_mask |= (1 << 4); 1671 } 1672 1673 udma_mask = 0; 1674 if (id[ATA_ID_FIELD_VALID] & (1 << 2)) 1675 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff; 1676 1677 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask); 1678 } 1679 1680 /** 1681 * ata_pio_queue_task - Queue port_task 1682 * @ap: The ata_port to queue port_task for 1683 * @data: data for @fn to use 1684 * @delay: delay time in msecs for workqueue function 1685 * 1686 * Schedule @fn(@data) for execution after @delay jiffies using 1687 * port_task. There is one port_task per port and it's the 1688 * user(low level driver)'s responsibility to make sure that only 1689 * one task is active at any given time. 1690 * 1691 * libata core layer takes care of synchronization between 1692 * port_task and EH. ata_pio_queue_task() may be ignored for EH 1693 * synchronization. 1694 * 1695 * LOCKING: 1696 * Inherited from caller. 1697 */ 1698 void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay) 1699 { 1700 ap->port_task_data = data; 1701 1702 /* may fail if ata_port_flush_task() in progress */ 1703 queue_delayed_work(ata_wq, &ap->port_task, msecs_to_jiffies(delay)); 1704 } 1705 1706 /** 1707 * ata_port_flush_task - Flush port_task 1708 * @ap: The ata_port to flush port_task for 1709 * 1710 * After this function completes, port_task is guranteed not to 1711 * be running or scheduled. 1712 * 1713 * LOCKING: 1714 * Kernel thread context (may sleep) 1715 */ 1716 void ata_port_flush_task(struct ata_port *ap) 1717 { 1718 DPRINTK("ENTER\n"); 1719 1720 cancel_rearming_delayed_work(&ap->port_task); 1721 1722 if (ata_msg_ctl(ap)) 1723 ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__); 1724 } 1725 1726 static void ata_qc_complete_internal(struct ata_queued_cmd *qc) 1727 { 1728 struct completion *waiting = qc->private_data; 1729 1730 complete(waiting); 1731 } 1732 1733 /** 1734 * ata_exec_internal_sg - execute libata internal command 1735 * @dev: Device to which the command is sent 1736 * @tf: Taskfile registers for the command and the result 1737 * @cdb: CDB for packet command 1738 * @dma_dir: Data tranfer direction of the command 1739 * @sgl: sg list for the data buffer of the command 1740 * @n_elem: Number of sg entries 1741 * @timeout: Timeout in msecs (0 for default) 1742 * 1743 * Executes libata internal command with timeout. @tf contains 1744 * command on entry and result on return. Timeout and error 1745 * conditions are reported via return value. No recovery action 1746 * is taken after a command times out. It's caller's duty to 1747 * clean up after timeout. 1748 * 1749 * LOCKING: 1750 * None. Should be called with kernel context, might sleep. 1751 * 1752 * RETURNS: 1753 * Zero on success, AC_ERR_* mask on failure 1754 */ 1755 unsigned ata_exec_internal_sg(struct ata_device *dev, 1756 struct ata_taskfile *tf, const u8 *cdb, 1757 int dma_dir, struct scatterlist *sgl, 1758 unsigned int n_elem, unsigned long timeout) 1759 { 1760 struct ata_link *link = dev->link; 1761 struct ata_port *ap = link->ap; 1762 u8 command = tf->command; 1763 int auto_timeout = 0; 1764 struct ata_queued_cmd *qc; 1765 unsigned int tag, preempted_tag; 1766 u32 preempted_sactive, preempted_qc_active; 1767 int preempted_nr_active_links; 1768 DECLARE_COMPLETION_ONSTACK(wait); 1769 unsigned long flags; 1770 unsigned int err_mask; 1771 int rc; 1772 1773 spin_lock_irqsave(ap->lock, flags); 1774 1775 /* no internal command while frozen */ 1776 if (ap->pflags & ATA_PFLAG_FROZEN) { 1777 spin_unlock_irqrestore(ap->lock, flags); 1778 return AC_ERR_SYSTEM; 1779 } 1780 1781 /* initialize internal qc */ 1782 1783 /* XXX: Tag 0 is used for drivers with legacy EH as some 1784 * drivers choke if any other tag is given. This breaks 1785 * ata_tag_internal() test for those drivers. Don't use new 1786 * EH stuff without converting to it. 1787 */ 1788 if (ap->ops->error_handler) 1789 tag = ATA_TAG_INTERNAL; 1790 else 1791 tag = 0; 1792 1793 if (test_and_set_bit(tag, &ap->qc_allocated)) 1794 BUG(); 1795 qc = __ata_qc_from_tag(ap, tag); 1796 1797 qc->tag = tag; 1798 qc->scsicmd = NULL; 1799 qc->ap = ap; 1800 qc->dev = dev; 1801 ata_qc_reinit(qc); 1802 1803 preempted_tag = link->active_tag; 1804 preempted_sactive = link->sactive; 1805 preempted_qc_active = ap->qc_active; 1806 preempted_nr_active_links = ap->nr_active_links; 1807 link->active_tag = ATA_TAG_POISON; 1808 link->sactive = 0; 1809 ap->qc_active = 0; 1810 ap->nr_active_links = 0; 1811 1812 /* prepare & issue qc */ 1813 qc->tf = *tf; 1814 if (cdb) 1815 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN); 1816 qc->flags |= ATA_QCFLAG_RESULT_TF; 1817 qc->dma_dir = dma_dir; 1818 if (dma_dir != DMA_NONE) { 1819 unsigned int i, buflen = 0; 1820 struct scatterlist *sg; 1821 1822 for_each_sg(sgl, sg, n_elem, i) 1823 buflen += sg->length; 1824 1825 ata_sg_init(qc, sgl, n_elem); 1826 qc->nbytes = buflen; 1827 } 1828 1829 qc->private_data = &wait; 1830 qc->complete_fn = ata_qc_complete_internal; 1831 1832 ata_qc_issue(qc); 1833 1834 spin_unlock_irqrestore(ap->lock, flags); 1835 1836 if (!timeout) { 1837 if (ata_probe_timeout) 1838 timeout = ata_probe_timeout * 1000; 1839 else { 1840 timeout = ata_internal_cmd_timeout(dev, command); 1841 auto_timeout = 1; 1842 } 1843 } 1844 1845 rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout)); 1846 1847 ata_port_flush_task(ap); 1848 1849 if (!rc) { 1850 spin_lock_irqsave(ap->lock, flags); 1851 1852 /* We're racing with irq here. If we lose, the 1853 * following test prevents us from completing the qc 1854 * twice. If we win, the port is frozen and will be 1855 * cleaned up by ->post_internal_cmd(). 1856 */ 1857 if (qc->flags & ATA_QCFLAG_ACTIVE) { 1858 qc->err_mask |= AC_ERR_TIMEOUT; 1859 1860 if (ap->ops->error_handler) 1861 ata_port_freeze(ap); 1862 else 1863 ata_qc_complete(qc); 1864 1865 if (ata_msg_warn(ap)) 1866 ata_dev_printk(dev, KERN_WARNING, 1867 "qc timeout (cmd 0x%x)\n", command); 1868 } 1869 1870 spin_unlock_irqrestore(ap->lock, flags); 1871 } 1872 1873 /* do post_internal_cmd */ 1874 if (ap->ops->post_internal_cmd) 1875 ap->ops->post_internal_cmd(qc); 1876 1877 /* perform minimal error analysis */ 1878 if (qc->flags & ATA_QCFLAG_FAILED) { 1879 if (qc->result_tf.command & (ATA_ERR | ATA_DF)) 1880 qc->err_mask |= AC_ERR_DEV; 1881 1882 if (!qc->err_mask) 1883 qc->err_mask |= AC_ERR_OTHER; 1884 1885 if (qc->err_mask & ~AC_ERR_OTHER) 1886 qc->err_mask &= ~AC_ERR_OTHER; 1887 } 1888 1889 /* finish up */ 1890 spin_lock_irqsave(ap->lock, flags); 1891 1892 *tf = qc->result_tf; 1893 err_mask = qc->err_mask; 1894 1895 ata_qc_free(qc); 1896 link->active_tag = preempted_tag; 1897 link->sactive = preempted_sactive; 1898 ap->qc_active = preempted_qc_active; 1899 ap->nr_active_links = preempted_nr_active_links; 1900 1901 /* XXX - Some LLDDs (sata_mv) disable port on command failure. 1902 * Until those drivers are fixed, we detect the condition 1903 * here, fail the command with AC_ERR_SYSTEM and reenable the 1904 * port. 1905 * 1906 * Note that this doesn't change any behavior as internal 1907 * command failure results in disabling the device in the 1908 * higher layer for LLDDs without new reset/EH callbacks. 1909 * 1910 * Kill the following code as soon as those drivers are fixed. 1911 */ 1912 if (ap->flags & ATA_FLAG_DISABLED) { 1913 err_mask |= AC_ERR_SYSTEM; 1914 ata_port_probe(ap); 1915 } 1916 1917 spin_unlock_irqrestore(ap->lock, flags); 1918 1919 if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout) 1920 ata_internal_cmd_timed_out(dev, command); 1921 1922 return err_mask; 1923 } 1924 1925 /** 1926 * ata_exec_internal - execute libata internal command 1927 * @dev: Device to which the command is sent 1928 * @tf: Taskfile registers for the command and the result 1929 * @cdb: CDB for packet command 1930 * @dma_dir: Data tranfer direction of the command 1931 * @buf: Data buffer of the command 1932 * @buflen: Length of data buffer 1933 * @timeout: Timeout in msecs (0 for default) 1934 * 1935 * Wrapper around ata_exec_internal_sg() which takes simple 1936 * buffer instead of sg list. 1937 * 1938 * LOCKING: 1939 * None. Should be called with kernel context, might sleep. 1940 * 1941 * RETURNS: 1942 * Zero on success, AC_ERR_* mask on failure 1943 */ 1944 unsigned ata_exec_internal(struct ata_device *dev, 1945 struct ata_taskfile *tf, const u8 *cdb, 1946 int dma_dir, void *buf, unsigned int buflen, 1947 unsigned long timeout) 1948 { 1949 struct scatterlist *psg = NULL, sg; 1950 unsigned int n_elem = 0; 1951 1952 if (dma_dir != DMA_NONE) { 1953 WARN_ON(!buf); 1954 sg_init_one(&sg, buf, buflen); 1955 psg = &sg; 1956 n_elem++; 1957 } 1958 1959 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem, 1960 timeout); 1961 } 1962 1963 /** 1964 * ata_do_simple_cmd - execute simple internal command 1965 * @dev: Device to which the command is sent 1966 * @cmd: Opcode to execute 1967 * 1968 * Execute a 'simple' command, that only consists of the opcode 1969 * 'cmd' itself, without filling any other registers 1970 * 1971 * LOCKING: 1972 * Kernel thread context (may sleep). 1973 * 1974 * RETURNS: 1975 * Zero on success, AC_ERR_* mask on failure 1976 */ 1977 unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd) 1978 { 1979 struct ata_taskfile tf; 1980 1981 ata_tf_init(dev, &tf); 1982 1983 tf.command = cmd; 1984 tf.flags |= ATA_TFLAG_DEVICE; 1985 tf.protocol = ATA_PROT_NODATA; 1986 1987 return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0); 1988 } 1989 1990 /** 1991 * ata_pio_need_iordy - check if iordy needed 1992 * @adev: ATA device 1993 * 1994 * Check if the current speed of the device requires IORDY. Used 1995 * by various controllers for chip configuration. 1996 */ 1997 1998 unsigned int ata_pio_need_iordy(const struct ata_device *adev) 1999 { 2000 /* Controller doesn't support IORDY. Probably a pointless check 2001 as the caller should know this */ 2002 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY) 2003 return 0; 2004 /* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6. */ 2005 if (ata_id_is_cfa(adev->id) 2006 && (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6)) 2007 return 0; 2008 /* PIO3 and higher it is mandatory */ 2009 if (adev->pio_mode > XFER_PIO_2) 2010 return 1; 2011 /* We turn it on when possible */ 2012 if (ata_id_has_iordy(adev->id)) 2013 return 1; 2014 return 0; 2015 } 2016 2017 /** 2018 * ata_pio_mask_no_iordy - Return the non IORDY mask 2019 * @adev: ATA device 2020 * 2021 * Compute the highest mode possible if we are not using iordy. Return 2022 * -1 if no iordy mode is available. 2023 */ 2024 2025 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev) 2026 { 2027 /* If we have no drive specific rule, then PIO 2 is non IORDY */ 2028 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */ 2029 u16 pio = adev->id[ATA_ID_EIDE_PIO]; 2030 /* Is the speed faster than the drive allows non IORDY ? */ 2031 if (pio) { 2032 /* This is cycle times not frequency - watch the logic! */ 2033 if (pio > 240) /* PIO2 is 240nS per cycle */ 2034 return 3 << ATA_SHIFT_PIO; 2035 return 7 << ATA_SHIFT_PIO; 2036 } 2037 } 2038 return 3 << ATA_SHIFT_PIO; 2039 } 2040 2041 /** 2042 * ata_do_dev_read_id - default ID read method 2043 * @dev: device 2044 * @tf: proposed taskfile 2045 * @id: data buffer 2046 * 2047 * Issue the identify taskfile and hand back the buffer containing 2048 * identify data. For some RAID controllers and for pre ATA devices 2049 * this function is wrapped or replaced by the driver 2050 */ 2051 unsigned int ata_do_dev_read_id(struct ata_device *dev, 2052 struct ata_taskfile *tf, u16 *id) 2053 { 2054 return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE, 2055 id, sizeof(id[0]) * ATA_ID_WORDS, 0); 2056 } 2057 2058 /** 2059 * ata_dev_read_id - Read ID data from the specified device 2060 * @dev: target device 2061 * @p_class: pointer to class of the target device (may be changed) 2062 * @flags: ATA_READID_* flags 2063 * @id: buffer to read IDENTIFY data into 2064 * 2065 * Read ID data from the specified device. ATA_CMD_ID_ATA is 2066 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI 2067 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS 2068 * for pre-ATA4 drives. 2069 * 2070 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right 2071 * now we abort if we hit that case. 2072 * 2073 * LOCKING: 2074 * Kernel thread context (may sleep) 2075 * 2076 * RETURNS: 2077 * 0 on success, -errno otherwise. 2078 */ 2079 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class, 2080 unsigned int flags, u16 *id) 2081 { 2082 struct ata_port *ap = dev->link->ap; 2083 unsigned int class = *p_class; 2084 struct ata_taskfile tf; 2085 unsigned int err_mask = 0; 2086 const char *reason; 2087 int may_fallback = 1, tried_spinup = 0; 2088 int rc; 2089 2090 if (ata_msg_ctl(ap)) 2091 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__); 2092 2093 retry: 2094 ata_tf_init(dev, &tf); 2095 2096 switch (class) { 2097 case ATA_DEV_ATA: 2098 tf.command = ATA_CMD_ID_ATA; 2099 break; 2100 case ATA_DEV_ATAPI: 2101 tf.command = ATA_CMD_ID_ATAPI; 2102 break; 2103 default: 2104 rc = -ENODEV; 2105 reason = "unsupported class"; 2106 goto err_out; 2107 } 2108 2109 tf.protocol = ATA_PROT_PIO; 2110 2111 /* Some devices choke if TF registers contain garbage. Make 2112 * sure those are properly initialized. 2113 */ 2114 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 2115 2116 /* Device presence detection is unreliable on some 2117 * controllers. Always poll IDENTIFY if available. 2118 */ 2119 tf.flags |= ATA_TFLAG_POLLING; 2120 2121 if (ap->ops->read_id) 2122 err_mask = ap->ops->read_id(dev, &tf, id); 2123 else 2124 err_mask = ata_do_dev_read_id(dev, &tf, id); 2125 2126 if (err_mask) { 2127 if (err_mask & AC_ERR_NODEV_HINT) { 2128 ata_dev_printk(dev, KERN_DEBUG, 2129 "NODEV after polling detection\n"); 2130 return -ENOENT; 2131 } 2132 2133 if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) { 2134 /* Device or controller might have reported 2135 * the wrong device class. Give a shot at the 2136 * other IDENTIFY if the current one is 2137 * aborted by the device. 2138 */ 2139 if (may_fallback) { 2140 may_fallback = 0; 2141 2142 if (class == ATA_DEV_ATA) 2143 class = ATA_DEV_ATAPI; 2144 else 2145 class = ATA_DEV_ATA; 2146 goto retry; 2147 } 2148 2149 /* Control reaches here iff the device aborted 2150 * both flavors of IDENTIFYs which happens 2151 * sometimes with phantom devices. 2152 */ 2153 ata_dev_printk(dev, KERN_DEBUG, 2154 "both IDENTIFYs aborted, assuming NODEV\n"); 2155 return -ENOENT; 2156 } 2157 2158 rc = -EIO; 2159 reason = "I/O error"; 2160 goto err_out; 2161 } 2162 2163 /* Falling back doesn't make sense if ID data was read 2164 * successfully at least once. 2165 */ 2166 may_fallback = 0; 2167 2168 swap_buf_le16(id, ATA_ID_WORDS); 2169 2170 /* sanity check */ 2171 rc = -EINVAL; 2172 reason = "device reports invalid type"; 2173 2174 if (class == ATA_DEV_ATA) { 2175 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id)) 2176 goto err_out; 2177 } else { 2178 if (ata_id_is_ata(id)) 2179 goto err_out; 2180 } 2181 2182 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) { 2183 tried_spinup = 1; 2184 /* 2185 * Drive powered-up in standby mode, and requires a specific 2186 * SET_FEATURES spin-up subcommand before it will accept 2187 * anything other than the original IDENTIFY command. 2188 */ 2189 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0); 2190 if (err_mask && id[2] != 0x738c) { 2191 rc = -EIO; 2192 reason = "SPINUP failed"; 2193 goto err_out; 2194 } 2195 /* 2196 * If the drive initially returned incomplete IDENTIFY info, 2197 * we now must reissue the IDENTIFY command. 2198 */ 2199 if (id[2] == 0x37c8) 2200 goto retry; 2201 } 2202 2203 if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) { 2204 /* 2205 * The exact sequence expected by certain pre-ATA4 drives is: 2206 * SRST RESET 2207 * IDENTIFY (optional in early ATA) 2208 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA) 2209 * anything else.. 2210 * Some drives were very specific about that exact sequence. 2211 * 2212 * Note that ATA4 says lba is mandatory so the second check 2213 * shoud never trigger. 2214 */ 2215 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) { 2216 err_mask = ata_dev_init_params(dev, id[3], id[6]); 2217 if (err_mask) { 2218 rc = -EIO; 2219 reason = "INIT_DEV_PARAMS failed"; 2220 goto err_out; 2221 } 2222 2223 /* current CHS translation info (id[53-58]) might be 2224 * changed. reread the identify device info. 2225 */ 2226 flags &= ~ATA_READID_POSTRESET; 2227 goto retry; 2228 } 2229 } 2230 2231 *p_class = class; 2232 2233 return 0; 2234 2235 err_out: 2236 if (ata_msg_warn(ap)) 2237 ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY " 2238 "(%s, err_mask=0x%x)\n", reason, err_mask); 2239 return rc; 2240 } 2241 2242 static inline u8 ata_dev_knobble(struct ata_device *dev) 2243 { 2244 struct ata_port *ap = dev->link->ap; 2245 2246 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK) 2247 return 0; 2248 2249 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id))); 2250 } 2251 2252 static void ata_dev_config_ncq(struct ata_device *dev, 2253 char *desc, size_t desc_sz) 2254 { 2255 struct ata_port *ap = dev->link->ap; 2256 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id); 2257 2258 if (!ata_id_has_ncq(dev->id)) { 2259 desc[0] = '\0'; 2260 return; 2261 } 2262 if (dev->horkage & ATA_HORKAGE_NONCQ) { 2263 snprintf(desc, desc_sz, "NCQ (not used)"); 2264 return; 2265 } 2266 if (ap->flags & ATA_FLAG_NCQ) { 2267 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1); 2268 dev->flags |= ATA_DFLAG_NCQ; 2269 } 2270 2271 if (hdepth >= ddepth) 2272 snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth); 2273 else 2274 snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth); 2275 } 2276 2277 /** 2278 * ata_dev_configure - Configure the specified ATA/ATAPI device 2279 * @dev: Target device to configure 2280 * 2281 * Configure @dev according to @dev->id. Generic and low-level 2282 * driver specific fixups are also applied. 2283 * 2284 * LOCKING: 2285 * Kernel thread context (may sleep) 2286 * 2287 * RETURNS: 2288 * 0 on success, -errno otherwise 2289 */ 2290 int ata_dev_configure(struct ata_device *dev) 2291 { 2292 struct ata_port *ap = dev->link->ap; 2293 struct ata_eh_context *ehc = &dev->link->eh_context; 2294 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO; 2295 const u16 *id = dev->id; 2296 unsigned long xfer_mask; 2297 char revbuf[7]; /* XYZ-99\0 */ 2298 char fwrevbuf[ATA_ID_FW_REV_LEN+1]; 2299 char modelbuf[ATA_ID_PROD_LEN+1]; 2300 int rc; 2301 2302 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) { 2303 ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n", 2304 __func__); 2305 return 0; 2306 } 2307 2308 if (ata_msg_probe(ap)) 2309 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__); 2310 2311 /* set horkage */ 2312 dev->horkage |= ata_dev_blacklisted(dev); 2313 ata_force_horkage(dev); 2314 2315 if (dev->horkage & ATA_HORKAGE_DISABLE) { 2316 ata_dev_printk(dev, KERN_INFO, 2317 "unsupported device, disabling\n"); 2318 ata_dev_disable(dev); 2319 return 0; 2320 } 2321 2322 if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) && 2323 dev->class == ATA_DEV_ATAPI) { 2324 ata_dev_printk(dev, KERN_WARNING, 2325 "WARNING: ATAPI is %s, device ignored.\n", 2326 atapi_enabled ? "not supported with this driver" 2327 : "disabled"); 2328 ata_dev_disable(dev); 2329 return 0; 2330 } 2331 2332 /* let ACPI work its magic */ 2333 rc = ata_acpi_on_devcfg(dev); 2334 if (rc) 2335 return rc; 2336 2337 /* massage HPA, do it early as it might change IDENTIFY data */ 2338 rc = ata_hpa_resize(dev); 2339 if (rc) 2340 return rc; 2341 2342 /* print device capabilities */ 2343 if (ata_msg_probe(ap)) 2344 ata_dev_printk(dev, KERN_DEBUG, 2345 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x " 2346 "85:%04x 86:%04x 87:%04x 88:%04x\n", 2347 __func__, 2348 id[49], id[82], id[83], id[84], 2349 id[85], id[86], id[87], id[88]); 2350 2351 /* initialize to-be-configured parameters */ 2352 dev->flags &= ~ATA_DFLAG_CFG_MASK; 2353 dev->max_sectors = 0; 2354 dev->cdb_len = 0; 2355 dev->n_sectors = 0; 2356 dev->cylinders = 0; 2357 dev->heads = 0; 2358 dev->sectors = 0; 2359 2360 /* 2361 * common ATA, ATAPI feature tests 2362 */ 2363 2364 /* find max transfer mode; for printk only */ 2365 xfer_mask = ata_id_xfermask(id); 2366 2367 if (ata_msg_probe(ap)) 2368 ata_dump_id(id); 2369 2370 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */ 2371 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV, 2372 sizeof(fwrevbuf)); 2373 2374 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD, 2375 sizeof(modelbuf)); 2376 2377 /* ATA-specific feature tests */ 2378 if (dev->class == ATA_DEV_ATA) { 2379 if (ata_id_is_cfa(id)) { 2380 if (id[162] & 1) /* CPRM may make this media unusable */ 2381 ata_dev_printk(dev, KERN_WARNING, 2382 "supports DRM functions and may " 2383 "not be fully accessable.\n"); 2384 snprintf(revbuf, 7, "CFA"); 2385 } else { 2386 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id)); 2387 /* Warn the user if the device has TPM extensions */ 2388 if (ata_id_has_tpm(id)) 2389 ata_dev_printk(dev, KERN_WARNING, 2390 "supports DRM functions and may " 2391 "not be fully accessable.\n"); 2392 } 2393 2394 dev->n_sectors = ata_id_n_sectors(id); 2395 2396 if (dev->id[59] & 0x100) 2397 dev->multi_count = dev->id[59] & 0xff; 2398 2399 if (ata_id_has_lba(id)) { 2400 const char *lba_desc; 2401 char ncq_desc[20]; 2402 2403 lba_desc = "LBA"; 2404 dev->flags |= ATA_DFLAG_LBA; 2405 if (ata_id_has_lba48(id)) { 2406 dev->flags |= ATA_DFLAG_LBA48; 2407 lba_desc = "LBA48"; 2408 2409 if (dev->n_sectors >= (1UL << 28) && 2410 ata_id_has_flush_ext(id)) 2411 dev->flags |= ATA_DFLAG_FLUSH_EXT; 2412 } 2413 2414 /* config NCQ */ 2415 ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc)); 2416 2417 /* print device info to dmesg */ 2418 if (ata_msg_drv(ap) && print_info) { 2419 ata_dev_printk(dev, KERN_INFO, 2420 "%s: %s, %s, max %s\n", 2421 revbuf, modelbuf, fwrevbuf, 2422 ata_mode_string(xfer_mask)); 2423 ata_dev_printk(dev, KERN_INFO, 2424 "%Lu sectors, multi %u: %s %s\n", 2425 (unsigned long long)dev->n_sectors, 2426 dev->multi_count, lba_desc, ncq_desc); 2427 } 2428 } else { 2429 /* CHS */ 2430 2431 /* Default translation */ 2432 dev->cylinders = id[1]; 2433 dev->heads = id[3]; 2434 dev->sectors = id[6]; 2435 2436 if (ata_id_current_chs_valid(id)) { 2437 /* Current CHS translation is valid. */ 2438 dev->cylinders = id[54]; 2439 dev->heads = id[55]; 2440 dev->sectors = id[56]; 2441 } 2442 2443 /* print device info to dmesg */ 2444 if (ata_msg_drv(ap) && print_info) { 2445 ata_dev_printk(dev, KERN_INFO, 2446 "%s: %s, %s, max %s\n", 2447 revbuf, modelbuf, fwrevbuf, 2448 ata_mode_string(xfer_mask)); 2449 ata_dev_printk(dev, KERN_INFO, 2450 "%Lu sectors, multi %u, CHS %u/%u/%u\n", 2451 (unsigned long long)dev->n_sectors, 2452 dev->multi_count, dev->cylinders, 2453 dev->heads, dev->sectors); 2454 } 2455 } 2456 2457 dev->cdb_len = 16; 2458 } 2459 2460 /* ATAPI-specific feature tests */ 2461 else if (dev->class == ATA_DEV_ATAPI) { 2462 const char *cdb_intr_string = ""; 2463 const char *atapi_an_string = ""; 2464 const char *dma_dir_string = ""; 2465 u32 sntf; 2466 2467 rc = atapi_cdb_len(id); 2468 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) { 2469 if (ata_msg_warn(ap)) 2470 ata_dev_printk(dev, KERN_WARNING, 2471 "unsupported CDB len\n"); 2472 rc = -EINVAL; 2473 goto err_out_nosup; 2474 } 2475 dev->cdb_len = (unsigned int) rc; 2476 2477 /* Enable ATAPI AN if both the host and device have 2478 * the support. If PMP is attached, SNTF is required 2479 * to enable ATAPI AN to discern between PHY status 2480 * changed notifications and ATAPI ANs. 2481 */ 2482 if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) && 2483 (!sata_pmp_attached(ap) || 2484 sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) { 2485 unsigned int err_mask; 2486 2487 /* issue SET feature command to turn this on */ 2488 err_mask = ata_dev_set_feature(dev, 2489 SETFEATURES_SATA_ENABLE, SATA_AN); 2490 if (err_mask) 2491 ata_dev_printk(dev, KERN_ERR, 2492 "failed to enable ATAPI AN " 2493 "(err_mask=0x%x)\n", err_mask); 2494 else { 2495 dev->flags |= ATA_DFLAG_AN; 2496 atapi_an_string = ", ATAPI AN"; 2497 } 2498 } 2499 2500 if (ata_id_cdb_intr(dev->id)) { 2501 dev->flags |= ATA_DFLAG_CDB_INTR; 2502 cdb_intr_string = ", CDB intr"; 2503 } 2504 2505 if (atapi_dmadir || atapi_id_dmadir(dev->id)) { 2506 dev->flags |= ATA_DFLAG_DMADIR; 2507 dma_dir_string = ", DMADIR"; 2508 } 2509 2510 /* print device info to dmesg */ 2511 if (ata_msg_drv(ap) && print_info) 2512 ata_dev_printk(dev, KERN_INFO, 2513 "ATAPI: %s, %s, max %s%s%s%s\n", 2514 modelbuf, fwrevbuf, 2515 ata_mode_string(xfer_mask), 2516 cdb_intr_string, atapi_an_string, 2517 dma_dir_string); 2518 } 2519 2520 /* determine max_sectors */ 2521 dev->max_sectors = ATA_MAX_SECTORS; 2522 if (dev->flags & ATA_DFLAG_LBA48) 2523 dev->max_sectors = ATA_MAX_SECTORS_LBA48; 2524 2525 if (!(dev->horkage & ATA_HORKAGE_IPM)) { 2526 if (ata_id_has_hipm(dev->id)) 2527 dev->flags |= ATA_DFLAG_HIPM; 2528 if (ata_id_has_dipm(dev->id)) 2529 dev->flags |= ATA_DFLAG_DIPM; 2530 } 2531 2532 /* Limit PATA drive on SATA cable bridge transfers to udma5, 2533 200 sectors */ 2534 if (ata_dev_knobble(dev)) { 2535 if (ata_msg_drv(ap) && print_info) 2536 ata_dev_printk(dev, KERN_INFO, 2537 "applying bridge limits\n"); 2538 dev->udma_mask &= ATA_UDMA5; 2539 dev->max_sectors = ATA_MAX_SECTORS; 2540 } 2541 2542 if ((dev->class == ATA_DEV_ATAPI) && 2543 (atapi_command_packet_set(id) == TYPE_TAPE)) { 2544 dev->max_sectors = ATA_MAX_SECTORS_TAPE; 2545 dev->horkage |= ATA_HORKAGE_STUCK_ERR; 2546 } 2547 2548 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128) 2549 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128, 2550 dev->max_sectors); 2551 2552 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) { 2553 dev->horkage |= ATA_HORKAGE_IPM; 2554 2555 /* reset link pm_policy for this port to no pm */ 2556 ap->pm_policy = MAX_PERFORMANCE; 2557 } 2558 2559 if (ap->ops->dev_config) 2560 ap->ops->dev_config(dev); 2561 2562 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) { 2563 /* Let the user know. We don't want to disallow opens for 2564 rescue purposes, or in case the vendor is just a blithering 2565 idiot. Do this after the dev_config call as some controllers 2566 with buggy firmware may want to avoid reporting false device 2567 bugs */ 2568 2569 if (print_info) { 2570 ata_dev_printk(dev, KERN_WARNING, 2571 "Drive reports diagnostics failure. This may indicate a drive\n"); 2572 ata_dev_printk(dev, KERN_WARNING, 2573 "fault or invalid emulation. Contact drive vendor for information.\n"); 2574 } 2575 } 2576 2577 if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) { 2578 ata_dev_printk(dev, KERN_WARNING, "WARNING: device requires " 2579 "firmware update to be fully functional.\n"); 2580 ata_dev_printk(dev, KERN_WARNING, " contact the vendor " 2581 "or visit http://ata.wiki.kernel.org.\n"); 2582 } 2583 2584 return 0; 2585 2586 err_out_nosup: 2587 if (ata_msg_probe(ap)) 2588 ata_dev_printk(dev, KERN_DEBUG, 2589 "%s: EXIT, err\n", __func__); 2590 return rc; 2591 } 2592 2593 /** 2594 * ata_cable_40wire - return 40 wire cable type 2595 * @ap: port 2596 * 2597 * Helper method for drivers which want to hardwire 40 wire cable 2598 * detection. 2599 */ 2600 2601 int ata_cable_40wire(struct ata_port *ap) 2602 { 2603 return ATA_CBL_PATA40; 2604 } 2605 2606 /** 2607 * ata_cable_80wire - return 80 wire cable type 2608 * @ap: port 2609 * 2610 * Helper method for drivers which want to hardwire 80 wire cable 2611 * detection. 2612 */ 2613 2614 int ata_cable_80wire(struct ata_port *ap) 2615 { 2616 return ATA_CBL_PATA80; 2617 } 2618 2619 /** 2620 * ata_cable_unknown - return unknown PATA cable. 2621 * @ap: port 2622 * 2623 * Helper method for drivers which have no PATA cable detection. 2624 */ 2625 2626 int ata_cable_unknown(struct ata_port *ap) 2627 { 2628 return ATA_CBL_PATA_UNK; 2629 } 2630 2631 /** 2632 * ata_cable_ignore - return ignored PATA cable. 2633 * @ap: port 2634 * 2635 * Helper method for drivers which don't use cable type to limit 2636 * transfer mode. 2637 */ 2638 int ata_cable_ignore(struct ata_port *ap) 2639 { 2640 return ATA_CBL_PATA_IGN; 2641 } 2642 2643 /** 2644 * ata_cable_sata - return SATA cable type 2645 * @ap: port 2646 * 2647 * Helper method for drivers which have SATA cables 2648 */ 2649 2650 int ata_cable_sata(struct ata_port *ap) 2651 { 2652 return ATA_CBL_SATA; 2653 } 2654 2655 /** 2656 * ata_bus_probe - Reset and probe ATA bus 2657 * @ap: Bus to probe 2658 * 2659 * Master ATA bus probing function. Initiates a hardware-dependent 2660 * bus reset, then attempts to identify any devices found on 2661 * the bus. 2662 * 2663 * LOCKING: 2664 * PCI/etc. bus probe sem. 2665 * 2666 * RETURNS: 2667 * Zero on success, negative errno otherwise. 2668 */ 2669 2670 int ata_bus_probe(struct ata_port *ap) 2671 { 2672 unsigned int classes[ATA_MAX_DEVICES]; 2673 int tries[ATA_MAX_DEVICES]; 2674 int rc; 2675 struct ata_device *dev; 2676 2677 ata_port_probe(ap); 2678 2679 ata_for_each_dev(dev, &ap->link, ALL) 2680 tries[dev->devno] = ATA_PROBE_MAX_TRIES; 2681 2682 retry: 2683 ata_for_each_dev(dev, &ap->link, ALL) { 2684 /* If we issue an SRST then an ATA drive (not ATAPI) 2685 * may change configuration and be in PIO0 timing. If 2686 * we do a hard reset (or are coming from power on) 2687 * this is true for ATA or ATAPI. Until we've set a 2688 * suitable controller mode we should not touch the 2689 * bus as we may be talking too fast. 2690 */ 2691 dev->pio_mode = XFER_PIO_0; 2692 2693 /* If the controller has a pio mode setup function 2694 * then use it to set the chipset to rights. Don't 2695 * touch the DMA setup as that will be dealt with when 2696 * configuring devices. 2697 */ 2698 if (ap->ops->set_piomode) 2699 ap->ops->set_piomode(ap, dev); 2700 } 2701 2702 /* reset and determine device classes */ 2703 ap->ops->phy_reset(ap); 2704 2705 ata_for_each_dev(dev, &ap->link, ALL) { 2706 if (!(ap->flags & ATA_FLAG_DISABLED) && 2707 dev->class != ATA_DEV_UNKNOWN) 2708 classes[dev->devno] = dev->class; 2709 else 2710 classes[dev->devno] = ATA_DEV_NONE; 2711 2712 dev->class = ATA_DEV_UNKNOWN; 2713 } 2714 2715 ata_port_probe(ap); 2716 2717 /* read IDENTIFY page and configure devices. We have to do the identify 2718 specific sequence bass-ackwards so that PDIAG- is released by 2719 the slave device */ 2720 2721 ata_for_each_dev(dev, &ap->link, ALL_REVERSE) { 2722 if (tries[dev->devno]) 2723 dev->class = classes[dev->devno]; 2724 2725 if (!ata_dev_enabled(dev)) 2726 continue; 2727 2728 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET, 2729 dev->id); 2730 if (rc) 2731 goto fail; 2732 } 2733 2734 /* Now ask for the cable type as PDIAG- should have been released */ 2735 if (ap->ops->cable_detect) 2736 ap->cbl = ap->ops->cable_detect(ap); 2737 2738 /* We may have SATA bridge glue hiding here irrespective of 2739 * the reported cable types and sensed types. When SATA 2740 * drives indicate we have a bridge, we don't know which end 2741 * of the link the bridge is which is a problem. 2742 */ 2743 ata_for_each_dev(dev, &ap->link, ENABLED) 2744 if (ata_id_is_sata(dev->id)) 2745 ap->cbl = ATA_CBL_SATA; 2746 2747 /* After the identify sequence we can now set up the devices. We do 2748 this in the normal order so that the user doesn't get confused */ 2749 2750 ata_for_each_dev(dev, &ap->link, ENABLED) { 2751 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO; 2752 rc = ata_dev_configure(dev); 2753 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO; 2754 if (rc) 2755 goto fail; 2756 } 2757 2758 /* configure transfer mode */ 2759 rc = ata_set_mode(&ap->link, &dev); 2760 if (rc) 2761 goto fail; 2762 2763 ata_for_each_dev(dev, &ap->link, ENABLED) 2764 return 0; 2765 2766 /* no device present, disable port */ 2767 ata_port_disable(ap); 2768 return -ENODEV; 2769 2770 fail: 2771 tries[dev->devno]--; 2772 2773 switch (rc) { 2774 case -EINVAL: 2775 /* eeek, something went very wrong, give up */ 2776 tries[dev->devno] = 0; 2777 break; 2778 2779 case -ENODEV: 2780 /* give it just one more chance */ 2781 tries[dev->devno] = min(tries[dev->devno], 1); 2782 case -EIO: 2783 if (tries[dev->devno] == 1) { 2784 /* This is the last chance, better to slow 2785 * down than lose it. 2786 */ 2787 sata_down_spd_limit(&ap->link); 2788 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO); 2789 } 2790 } 2791 2792 if (!tries[dev->devno]) 2793 ata_dev_disable(dev); 2794 2795 goto retry; 2796 } 2797 2798 /** 2799 * ata_port_probe - Mark port as enabled 2800 * @ap: Port for which we indicate enablement 2801 * 2802 * Modify @ap data structure such that the system 2803 * thinks that the entire port is enabled. 2804 * 2805 * LOCKING: host lock, or some other form of 2806 * serialization. 2807 */ 2808 2809 void ata_port_probe(struct ata_port *ap) 2810 { 2811 ap->flags &= ~ATA_FLAG_DISABLED; 2812 } 2813 2814 /** 2815 * sata_print_link_status - Print SATA link status 2816 * @link: SATA link to printk link status about 2817 * 2818 * This function prints link speed and status of a SATA link. 2819 * 2820 * LOCKING: 2821 * None. 2822 */ 2823 static void sata_print_link_status(struct ata_link *link) 2824 { 2825 u32 sstatus, scontrol, tmp; 2826 2827 if (sata_scr_read(link, SCR_STATUS, &sstatus)) 2828 return; 2829 sata_scr_read(link, SCR_CONTROL, &scontrol); 2830 2831 if (ata_phys_link_online(link)) { 2832 tmp = (sstatus >> 4) & 0xf; 2833 ata_link_printk(link, KERN_INFO, 2834 "SATA link up %s (SStatus %X SControl %X)\n", 2835 sata_spd_string(tmp), sstatus, scontrol); 2836 } else { 2837 ata_link_printk(link, KERN_INFO, 2838 "SATA link down (SStatus %X SControl %X)\n", 2839 sstatus, scontrol); 2840 } 2841 } 2842 2843 /** 2844 * ata_dev_pair - return other device on cable 2845 * @adev: device 2846 * 2847 * Obtain the other device on the same cable, or if none is 2848 * present NULL is returned 2849 */ 2850 2851 struct ata_device *ata_dev_pair(struct ata_device *adev) 2852 { 2853 struct ata_link *link = adev->link; 2854 struct ata_device *pair = &link->device[1 - adev->devno]; 2855 if (!ata_dev_enabled(pair)) 2856 return NULL; 2857 return pair; 2858 } 2859 2860 /** 2861 * ata_port_disable - Disable port. 2862 * @ap: Port to be disabled. 2863 * 2864 * Modify @ap data structure such that the system 2865 * thinks that the entire port is disabled, and should 2866 * never attempt to probe or communicate with devices 2867 * on this port. 2868 * 2869 * LOCKING: host lock, or some other form of 2870 * serialization. 2871 */ 2872 2873 void ata_port_disable(struct ata_port *ap) 2874 { 2875 ap->link.device[0].class = ATA_DEV_NONE; 2876 ap->link.device[1].class = ATA_DEV_NONE; 2877 ap->flags |= ATA_FLAG_DISABLED; 2878 } 2879 2880 /** 2881 * sata_down_spd_limit - adjust SATA spd limit downward 2882 * @link: Link to adjust SATA spd limit for 2883 * 2884 * Adjust SATA spd limit of @link downward. Note that this 2885 * function only adjusts the limit. The change must be applied 2886 * using sata_set_spd(). 2887 * 2888 * LOCKING: 2889 * Inherited from caller. 2890 * 2891 * RETURNS: 2892 * 0 on success, negative errno on failure 2893 */ 2894 int sata_down_spd_limit(struct ata_link *link) 2895 { 2896 u32 sstatus, spd, mask; 2897 int rc, highbit; 2898 2899 if (!sata_scr_valid(link)) 2900 return -EOPNOTSUPP; 2901 2902 /* If SCR can be read, use it to determine the current SPD. 2903 * If not, use cached value in link->sata_spd. 2904 */ 2905 rc = sata_scr_read(link, SCR_STATUS, &sstatus); 2906 if (rc == 0) 2907 spd = (sstatus >> 4) & 0xf; 2908 else 2909 spd = link->sata_spd; 2910 2911 mask = link->sata_spd_limit; 2912 if (mask <= 1) 2913 return -EINVAL; 2914 2915 /* unconditionally mask off the highest bit */ 2916 highbit = fls(mask) - 1; 2917 mask &= ~(1 << highbit); 2918 2919 /* Mask off all speeds higher than or equal to the current 2920 * one. Force 1.5Gbps if current SPD is not available. 2921 */ 2922 if (spd > 1) 2923 mask &= (1 << (spd - 1)) - 1; 2924 else 2925 mask &= 1; 2926 2927 /* were we already at the bottom? */ 2928 if (!mask) 2929 return -EINVAL; 2930 2931 link->sata_spd_limit = mask; 2932 2933 ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n", 2934 sata_spd_string(fls(mask))); 2935 2936 return 0; 2937 } 2938 2939 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol) 2940 { 2941 struct ata_link *host_link = &link->ap->link; 2942 u32 limit, target, spd; 2943 2944 limit = link->sata_spd_limit; 2945 2946 /* Don't configure downstream link faster than upstream link. 2947 * It doesn't speed up anything and some PMPs choke on such 2948 * configuration. 2949 */ 2950 if (!ata_is_host_link(link) && host_link->sata_spd) 2951 limit &= (1 << host_link->sata_spd) - 1; 2952 2953 if (limit == UINT_MAX) 2954 target = 0; 2955 else 2956 target = fls(limit); 2957 2958 spd = (*scontrol >> 4) & 0xf; 2959 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4); 2960 2961 return spd != target; 2962 } 2963 2964 /** 2965 * sata_set_spd_needed - is SATA spd configuration needed 2966 * @link: Link in question 2967 * 2968 * Test whether the spd limit in SControl matches 2969 * @link->sata_spd_limit. This function is used to determine 2970 * whether hardreset is necessary to apply SATA spd 2971 * configuration. 2972 * 2973 * LOCKING: 2974 * Inherited from caller. 2975 * 2976 * RETURNS: 2977 * 1 if SATA spd configuration is needed, 0 otherwise. 2978 */ 2979 static int sata_set_spd_needed(struct ata_link *link) 2980 { 2981 u32 scontrol; 2982 2983 if (sata_scr_read(link, SCR_CONTROL, &scontrol)) 2984 return 1; 2985 2986 return __sata_set_spd_needed(link, &scontrol); 2987 } 2988 2989 /** 2990 * sata_set_spd - set SATA spd according to spd limit 2991 * @link: Link to set SATA spd for 2992 * 2993 * Set SATA spd of @link according to sata_spd_limit. 2994 * 2995 * LOCKING: 2996 * Inherited from caller. 2997 * 2998 * RETURNS: 2999 * 0 if spd doesn't need to be changed, 1 if spd has been 3000 * changed. Negative errno if SCR registers are inaccessible. 3001 */ 3002 int sata_set_spd(struct ata_link *link) 3003 { 3004 u32 scontrol; 3005 int rc; 3006 3007 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol))) 3008 return rc; 3009 3010 if (!__sata_set_spd_needed(link, &scontrol)) 3011 return 0; 3012 3013 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol))) 3014 return rc; 3015 3016 return 1; 3017 } 3018 3019 /* 3020 * This mode timing computation functionality is ported over from 3021 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik 3022 */ 3023 /* 3024 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds). 3025 * These were taken from ATA/ATAPI-6 standard, rev 0a, except 3026 * for UDMA6, which is currently supported only by Maxtor drives. 3027 * 3028 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0. 3029 */ 3030 3031 static const struct ata_timing ata_timing[] = { 3032 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960, 0 }, */ 3033 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0 }, 3034 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 383, 0 }, 3035 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 240, 0 }, 3036 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 180, 0 }, 3037 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 120, 0 }, 3038 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 100, 0 }, 3039 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 80, 0 }, 3040 3041 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 960, 0 }, 3042 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 480, 0 }, 3043 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 240, 0 }, 3044 3045 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 480, 0 }, 3046 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 150, 0 }, 3047 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 120, 0 }, 3048 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 100, 0 }, 3049 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 80, 0 }, 3050 3051 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 150 }, */ 3052 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 120 }, 3053 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 80 }, 3054 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 60 }, 3055 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 45 }, 3056 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 30 }, 3057 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 20 }, 3058 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 15 }, 3059 3060 { 0xFF } 3061 }; 3062 3063 #define ENOUGH(v, unit) (((v)-1)/(unit)+1) 3064 #define EZ(v, unit) ((v)?ENOUGH(v, unit):0) 3065 3066 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT) 3067 { 3068 q->setup = EZ(t->setup * 1000, T); 3069 q->act8b = EZ(t->act8b * 1000, T); 3070 q->rec8b = EZ(t->rec8b * 1000, T); 3071 q->cyc8b = EZ(t->cyc8b * 1000, T); 3072 q->active = EZ(t->active * 1000, T); 3073 q->recover = EZ(t->recover * 1000, T); 3074 q->cycle = EZ(t->cycle * 1000, T); 3075 q->udma = EZ(t->udma * 1000, UT); 3076 } 3077 3078 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b, 3079 struct ata_timing *m, unsigned int what) 3080 { 3081 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup); 3082 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b); 3083 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b); 3084 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b); 3085 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active); 3086 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover); 3087 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle); 3088 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma); 3089 } 3090 3091 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode) 3092 { 3093 const struct ata_timing *t = ata_timing; 3094 3095 while (xfer_mode > t->mode) 3096 t++; 3097 3098 if (xfer_mode == t->mode) 3099 return t; 3100 return NULL; 3101 } 3102 3103 int ata_timing_compute(struct ata_device *adev, unsigned short speed, 3104 struct ata_timing *t, int T, int UT) 3105 { 3106 const struct ata_timing *s; 3107 struct ata_timing p; 3108 3109 /* 3110 * Find the mode. 3111 */ 3112 3113 if (!(s = ata_timing_find_mode(speed))) 3114 return -EINVAL; 3115 3116 memcpy(t, s, sizeof(*s)); 3117 3118 /* 3119 * If the drive is an EIDE drive, it can tell us it needs extended 3120 * PIO/MW_DMA cycle timing. 3121 */ 3122 3123 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */ 3124 memset(&p, 0, sizeof(p)); 3125 if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) { 3126 if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO]; 3127 else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY]; 3128 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) { 3129 p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN]; 3130 } 3131 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B); 3132 } 3133 3134 /* 3135 * Convert the timing to bus clock counts. 3136 */ 3137 3138 ata_timing_quantize(t, t, T, UT); 3139 3140 /* 3141 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY, 3142 * S.M.A.R.T * and some other commands. We have to ensure that the 3143 * DMA cycle timing is slower/equal than the fastest PIO timing. 3144 */ 3145 3146 if (speed > XFER_PIO_6) { 3147 ata_timing_compute(adev, adev->pio_mode, &p, T, UT); 3148 ata_timing_merge(&p, t, t, ATA_TIMING_ALL); 3149 } 3150 3151 /* 3152 * Lengthen active & recovery time so that cycle time is correct. 3153 */ 3154 3155 if (t->act8b + t->rec8b < t->cyc8b) { 3156 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2; 3157 t->rec8b = t->cyc8b - t->act8b; 3158 } 3159 3160 if (t->active + t->recover < t->cycle) { 3161 t->active += (t->cycle - (t->active + t->recover)) / 2; 3162 t->recover = t->cycle - t->active; 3163 } 3164 3165 /* In a few cases quantisation may produce enough errors to 3166 leave t->cycle too low for the sum of active and recovery 3167 if so we must correct this */ 3168 if (t->active + t->recover > t->cycle) 3169 t->cycle = t->active + t->recover; 3170 3171 return 0; 3172 } 3173 3174 /** 3175 * ata_timing_cycle2mode - find xfer mode for the specified cycle duration 3176 * @xfer_shift: ATA_SHIFT_* value for transfer type to examine. 3177 * @cycle: cycle duration in ns 3178 * 3179 * Return matching xfer mode for @cycle. The returned mode is of 3180 * the transfer type specified by @xfer_shift. If @cycle is too 3181 * slow for @xfer_shift, 0xff is returned. If @cycle is faster 3182 * than the fastest known mode, the fasted mode is returned. 3183 * 3184 * LOCKING: 3185 * None. 3186 * 3187 * RETURNS: 3188 * Matching xfer_mode, 0xff if no match found. 3189 */ 3190 u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle) 3191 { 3192 u8 base_mode = 0xff, last_mode = 0xff; 3193 const struct ata_xfer_ent *ent; 3194 const struct ata_timing *t; 3195 3196 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++) 3197 if (ent->shift == xfer_shift) 3198 base_mode = ent->base; 3199 3200 for (t = ata_timing_find_mode(base_mode); 3201 t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) { 3202 unsigned short this_cycle; 3203 3204 switch (xfer_shift) { 3205 case ATA_SHIFT_PIO: 3206 case ATA_SHIFT_MWDMA: 3207 this_cycle = t->cycle; 3208 break; 3209 case ATA_SHIFT_UDMA: 3210 this_cycle = t->udma; 3211 break; 3212 default: 3213 return 0xff; 3214 } 3215 3216 if (cycle > this_cycle) 3217 break; 3218 3219 last_mode = t->mode; 3220 } 3221 3222 return last_mode; 3223 } 3224 3225 /** 3226 * ata_down_xfermask_limit - adjust dev xfer masks downward 3227 * @dev: Device to adjust xfer masks 3228 * @sel: ATA_DNXFER_* selector 3229 * 3230 * Adjust xfer masks of @dev downward. Note that this function 3231 * does not apply the change. Invoking ata_set_mode() afterwards 3232 * will apply the limit. 3233 * 3234 * LOCKING: 3235 * Inherited from caller. 3236 * 3237 * RETURNS: 3238 * 0 on success, negative errno on failure 3239 */ 3240 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel) 3241 { 3242 char buf[32]; 3243 unsigned long orig_mask, xfer_mask; 3244 unsigned long pio_mask, mwdma_mask, udma_mask; 3245 int quiet, highbit; 3246 3247 quiet = !!(sel & ATA_DNXFER_QUIET); 3248 sel &= ~ATA_DNXFER_QUIET; 3249 3250 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask, 3251 dev->mwdma_mask, 3252 dev->udma_mask); 3253 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask); 3254 3255 switch (sel) { 3256 case ATA_DNXFER_PIO: 3257 highbit = fls(pio_mask) - 1; 3258 pio_mask &= ~(1 << highbit); 3259 break; 3260 3261 case ATA_DNXFER_DMA: 3262 if (udma_mask) { 3263 highbit = fls(udma_mask) - 1; 3264 udma_mask &= ~(1 << highbit); 3265 if (!udma_mask) 3266 return -ENOENT; 3267 } else if (mwdma_mask) { 3268 highbit = fls(mwdma_mask) - 1; 3269 mwdma_mask &= ~(1 << highbit); 3270 if (!mwdma_mask) 3271 return -ENOENT; 3272 } 3273 break; 3274 3275 case ATA_DNXFER_40C: 3276 udma_mask &= ATA_UDMA_MASK_40C; 3277 break; 3278 3279 case ATA_DNXFER_FORCE_PIO0: 3280 pio_mask &= 1; 3281 case ATA_DNXFER_FORCE_PIO: 3282 mwdma_mask = 0; 3283 udma_mask = 0; 3284 break; 3285 3286 default: 3287 BUG(); 3288 } 3289 3290 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask); 3291 3292 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask) 3293 return -ENOENT; 3294 3295 if (!quiet) { 3296 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA)) 3297 snprintf(buf, sizeof(buf), "%s:%s", 3298 ata_mode_string(xfer_mask), 3299 ata_mode_string(xfer_mask & ATA_MASK_PIO)); 3300 else 3301 snprintf(buf, sizeof(buf), "%s", 3302 ata_mode_string(xfer_mask)); 3303 3304 ata_dev_printk(dev, KERN_WARNING, 3305 "limiting speed to %s\n", buf); 3306 } 3307 3308 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask, 3309 &dev->udma_mask); 3310 3311 return 0; 3312 } 3313 3314 static int ata_dev_set_mode(struct ata_device *dev) 3315 { 3316 struct ata_eh_context *ehc = &dev->link->eh_context; 3317 const char *dev_err_whine = ""; 3318 int ign_dev_err = 0; 3319 unsigned int err_mask; 3320 int rc; 3321 3322 dev->flags &= ~ATA_DFLAG_PIO; 3323 if (dev->xfer_shift == ATA_SHIFT_PIO) 3324 dev->flags |= ATA_DFLAG_PIO; 3325 3326 err_mask = ata_dev_set_xfermode(dev); 3327 3328 if (err_mask & ~AC_ERR_DEV) 3329 goto fail; 3330 3331 /* revalidate */ 3332 ehc->i.flags |= ATA_EHI_POST_SETMODE; 3333 rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0); 3334 ehc->i.flags &= ~ATA_EHI_POST_SETMODE; 3335 if (rc) 3336 return rc; 3337 3338 if (dev->xfer_shift == ATA_SHIFT_PIO) { 3339 /* Old CFA may refuse this command, which is just fine */ 3340 if (ata_id_is_cfa(dev->id)) 3341 ign_dev_err = 1; 3342 /* Catch several broken garbage emulations plus some pre 3343 ATA devices */ 3344 if (ata_id_major_version(dev->id) == 0 && 3345 dev->pio_mode <= XFER_PIO_2) 3346 ign_dev_err = 1; 3347 /* Some very old devices and some bad newer ones fail 3348 any kind of SET_XFERMODE request but support PIO0-2 3349 timings and no IORDY */ 3350 if (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2) 3351 ign_dev_err = 1; 3352 } 3353 /* Early MWDMA devices do DMA but don't allow DMA mode setting. 3354 Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */ 3355 if (dev->xfer_shift == ATA_SHIFT_MWDMA && 3356 dev->dma_mode == XFER_MW_DMA_0 && 3357 (dev->id[63] >> 8) & 1) 3358 ign_dev_err = 1; 3359 3360 /* if the device is actually configured correctly, ignore dev err */ 3361 if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id))) 3362 ign_dev_err = 1; 3363 3364 if (err_mask & AC_ERR_DEV) { 3365 if (!ign_dev_err) 3366 goto fail; 3367 else 3368 dev_err_whine = " (device error ignored)"; 3369 } 3370 3371 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n", 3372 dev->xfer_shift, (int)dev->xfer_mode); 3373 3374 ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n", 3375 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)), 3376 dev_err_whine); 3377 3378 return 0; 3379 3380 fail: 3381 ata_dev_printk(dev, KERN_ERR, "failed to set xfermode " 3382 "(err_mask=0x%x)\n", err_mask); 3383 return -EIO; 3384 } 3385 3386 /** 3387 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER 3388 * @link: link on which timings will be programmed 3389 * @r_failed_dev: out parameter for failed device 3390 * 3391 * Standard implementation of the function used to tune and set 3392 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If 3393 * ata_dev_set_mode() fails, pointer to the failing device is 3394 * returned in @r_failed_dev. 3395 * 3396 * LOCKING: 3397 * PCI/etc. bus probe sem. 3398 * 3399 * RETURNS: 3400 * 0 on success, negative errno otherwise 3401 */ 3402 3403 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev) 3404 { 3405 struct ata_port *ap = link->ap; 3406 struct ata_device *dev; 3407 int rc = 0, used_dma = 0, found = 0; 3408 3409 /* step 1: calculate xfer_mask */ 3410 ata_for_each_dev(dev, link, ENABLED) { 3411 unsigned long pio_mask, dma_mask; 3412 unsigned int mode_mask; 3413 3414 mode_mask = ATA_DMA_MASK_ATA; 3415 if (dev->class == ATA_DEV_ATAPI) 3416 mode_mask = ATA_DMA_MASK_ATAPI; 3417 else if (ata_id_is_cfa(dev->id)) 3418 mode_mask = ATA_DMA_MASK_CFA; 3419 3420 ata_dev_xfermask(dev); 3421 ata_force_xfermask(dev); 3422 3423 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0); 3424 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask); 3425 3426 if (libata_dma_mask & mode_mask) 3427 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask); 3428 else 3429 dma_mask = 0; 3430 3431 dev->pio_mode = ata_xfer_mask2mode(pio_mask); 3432 dev->dma_mode = ata_xfer_mask2mode(dma_mask); 3433 3434 found = 1; 3435 if (ata_dma_enabled(dev)) 3436 used_dma = 1; 3437 } 3438 if (!found) 3439 goto out; 3440 3441 /* step 2: always set host PIO timings */ 3442 ata_for_each_dev(dev, link, ENABLED) { 3443 if (dev->pio_mode == 0xff) { 3444 ata_dev_printk(dev, KERN_WARNING, "no PIO support\n"); 3445 rc = -EINVAL; 3446 goto out; 3447 } 3448 3449 dev->xfer_mode = dev->pio_mode; 3450 dev->xfer_shift = ATA_SHIFT_PIO; 3451 if (ap->ops->set_piomode) 3452 ap->ops->set_piomode(ap, dev); 3453 } 3454 3455 /* step 3: set host DMA timings */ 3456 ata_for_each_dev(dev, link, ENABLED) { 3457 if (!ata_dma_enabled(dev)) 3458 continue; 3459 3460 dev->xfer_mode = dev->dma_mode; 3461 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode); 3462 if (ap->ops->set_dmamode) 3463 ap->ops->set_dmamode(ap, dev); 3464 } 3465 3466 /* step 4: update devices' xfer mode */ 3467 ata_for_each_dev(dev, link, ENABLED) { 3468 rc = ata_dev_set_mode(dev); 3469 if (rc) 3470 goto out; 3471 } 3472 3473 /* Record simplex status. If we selected DMA then the other 3474 * host channels are not permitted to do so. 3475 */ 3476 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX)) 3477 ap->host->simplex_claimed = ap; 3478 3479 out: 3480 if (rc) 3481 *r_failed_dev = dev; 3482 return rc; 3483 } 3484 3485 /** 3486 * ata_wait_ready - wait for link to become ready 3487 * @link: link to be waited on 3488 * @deadline: deadline jiffies for the operation 3489 * @check_ready: callback to check link readiness 3490 * 3491 * Wait for @link to become ready. @check_ready should return 3492 * positive number if @link is ready, 0 if it isn't, -ENODEV if 3493 * link doesn't seem to be occupied, other errno for other error 3494 * conditions. 3495 * 3496 * Transient -ENODEV conditions are allowed for 3497 * ATA_TMOUT_FF_WAIT. 3498 * 3499 * LOCKING: 3500 * EH context. 3501 * 3502 * RETURNS: 3503 * 0 if @linke is ready before @deadline; otherwise, -errno. 3504 */ 3505 int ata_wait_ready(struct ata_link *link, unsigned long deadline, 3506 int (*check_ready)(struct ata_link *link)) 3507 { 3508 unsigned long start = jiffies; 3509 unsigned long nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT); 3510 int warned = 0; 3511 3512 /* Slave readiness can't be tested separately from master. On 3513 * M/S emulation configuration, this function should be called 3514 * only on the master and it will handle both master and slave. 3515 */ 3516 WARN_ON(link == link->ap->slave_link); 3517 3518 if (time_after(nodev_deadline, deadline)) 3519 nodev_deadline = deadline; 3520 3521 while (1) { 3522 unsigned long now = jiffies; 3523 int ready, tmp; 3524 3525 ready = tmp = check_ready(link); 3526 if (ready > 0) 3527 return 0; 3528 3529 /* -ENODEV could be transient. Ignore -ENODEV if link 3530 * is online. Also, some SATA devices take a long 3531 * time to clear 0xff after reset. For example, 3532 * HHD424020F7SV00 iVDR needs >= 800ms while Quantum 3533 * GoVault needs even more than that. Wait for 3534 * ATA_TMOUT_FF_WAIT on -ENODEV if link isn't offline. 3535 * 3536 * Note that some PATA controllers (pata_ali) explode 3537 * if status register is read more than once when 3538 * there's no device attached. 3539 */ 3540 if (ready == -ENODEV) { 3541 if (ata_link_online(link)) 3542 ready = 0; 3543 else if ((link->ap->flags & ATA_FLAG_SATA) && 3544 !ata_link_offline(link) && 3545 time_before(now, nodev_deadline)) 3546 ready = 0; 3547 } 3548 3549 if (ready) 3550 return ready; 3551 if (time_after(now, deadline)) 3552 return -EBUSY; 3553 3554 if (!warned && time_after(now, start + 5 * HZ) && 3555 (deadline - now > 3 * HZ)) { 3556 ata_link_printk(link, KERN_WARNING, 3557 "link is slow to respond, please be patient " 3558 "(ready=%d)\n", tmp); 3559 warned = 1; 3560 } 3561 3562 msleep(50); 3563 } 3564 } 3565 3566 /** 3567 * ata_wait_after_reset - wait for link to become ready after reset 3568 * @link: link to be waited on 3569 * @deadline: deadline jiffies for the operation 3570 * @check_ready: callback to check link readiness 3571 * 3572 * Wait for @link to become ready after reset. 3573 * 3574 * LOCKING: 3575 * EH context. 3576 * 3577 * RETURNS: 3578 * 0 if @linke is ready before @deadline; otherwise, -errno. 3579 */ 3580 int ata_wait_after_reset(struct ata_link *link, unsigned long deadline, 3581 int (*check_ready)(struct ata_link *link)) 3582 { 3583 msleep(ATA_WAIT_AFTER_RESET); 3584 3585 return ata_wait_ready(link, deadline, check_ready); 3586 } 3587 3588 /** 3589 * sata_link_debounce - debounce SATA phy status 3590 * @link: ATA link to debounce SATA phy status for 3591 * @params: timing parameters { interval, duratinon, timeout } in msec 3592 * @deadline: deadline jiffies for the operation 3593 * 3594 * Make sure SStatus of @link reaches stable state, determined by 3595 * holding the same value where DET is not 1 for @duration polled 3596 * every @interval, before @timeout. Timeout constraints the 3597 * beginning of the stable state. Because DET gets stuck at 1 on 3598 * some controllers after hot unplugging, this functions waits 3599 * until timeout then returns 0 if DET is stable at 1. 3600 * 3601 * @timeout is further limited by @deadline. The sooner of the 3602 * two is used. 3603 * 3604 * LOCKING: 3605 * Kernel thread context (may sleep) 3606 * 3607 * RETURNS: 3608 * 0 on success, -errno on failure. 3609 */ 3610 int sata_link_debounce(struct ata_link *link, const unsigned long *params, 3611 unsigned long deadline) 3612 { 3613 unsigned long interval = params[0]; 3614 unsigned long duration = params[1]; 3615 unsigned long last_jiffies, t; 3616 u32 last, cur; 3617 int rc; 3618 3619 t = ata_deadline(jiffies, params[2]); 3620 if (time_before(t, deadline)) 3621 deadline = t; 3622 3623 if ((rc = sata_scr_read(link, SCR_STATUS, &cur))) 3624 return rc; 3625 cur &= 0xf; 3626 3627 last = cur; 3628 last_jiffies = jiffies; 3629 3630 while (1) { 3631 msleep(interval); 3632 if ((rc = sata_scr_read(link, SCR_STATUS, &cur))) 3633 return rc; 3634 cur &= 0xf; 3635 3636 /* DET stable? */ 3637 if (cur == last) { 3638 if (cur == 1 && time_before(jiffies, deadline)) 3639 continue; 3640 if (time_after(jiffies, 3641 ata_deadline(last_jiffies, duration))) 3642 return 0; 3643 continue; 3644 } 3645 3646 /* unstable, start over */ 3647 last = cur; 3648 last_jiffies = jiffies; 3649 3650 /* Check deadline. If debouncing failed, return 3651 * -EPIPE to tell upper layer to lower link speed. 3652 */ 3653 if (time_after(jiffies, deadline)) 3654 return -EPIPE; 3655 } 3656 } 3657 3658 /** 3659 * sata_link_resume - resume SATA link 3660 * @link: ATA link to resume SATA 3661 * @params: timing parameters { interval, duratinon, timeout } in msec 3662 * @deadline: deadline jiffies for the operation 3663 * 3664 * Resume SATA phy @link and debounce it. 3665 * 3666 * LOCKING: 3667 * Kernel thread context (may sleep) 3668 * 3669 * RETURNS: 3670 * 0 on success, -errno on failure. 3671 */ 3672 int sata_link_resume(struct ata_link *link, const unsigned long *params, 3673 unsigned long deadline) 3674 { 3675 u32 scontrol, serror; 3676 int rc; 3677 3678 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol))) 3679 return rc; 3680 3681 scontrol = (scontrol & 0x0f0) | 0x300; 3682 3683 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol))) 3684 return rc; 3685 3686 /* Some PHYs react badly if SStatus is pounded immediately 3687 * after resuming. Delay 200ms before debouncing. 3688 */ 3689 msleep(200); 3690 3691 if ((rc = sata_link_debounce(link, params, deadline))) 3692 return rc; 3693 3694 /* clear SError, some PHYs require this even for SRST to work */ 3695 if (!(rc = sata_scr_read(link, SCR_ERROR, &serror))) 3696 rc = sata_scr_write(link, SCR_ERROR, serror); 3697 3698 return rc != -EINVAL ? rc : 0; 3699 } 3700 3701 /** 3702 * ata_std_prereset - prepare for reset 3703 * @link: ATA link to be reset 3704 * @deadline: deadline jiffies for the operation 3705 * 3706 * @link is about to be reset. Initialize it. Failure from 3707 * prereset makes libata abort whole reset sequence and give up 3708 * that port, so prereset should be best-effort. It does its 3709 * best to prepare for reset sequence but if things go wrong, it 3710 * should just whine, not fail. 3711 * 3712 * LOCKING: 3713 * Kernel thread context (may sleep) 3714 * 3715 * RETURNS: 3716 * 0 on success, -errno otherwise. 3717 */ 3718 int ata_std_prereset(struct ata_link *link, unsigned long deadline) 3719 { 3720 struct ata_port *ap = link->ap; 3721 struct ata_eh_context *ehc = &link->eh_context; 3722 const unsigned long *timing = sata_ehc_deb_timing(ehc); 3723 int rc; 3724 3725 /* if we're about to do hardreset, nothing more to do */ 3726 if (ehc->i.action & ATA_EH_HARDRESET) 3727 return 0; 3728 3729 /* if SATA, resume link */ 3730 if (ap->flags & ATA_FLAG_SATA) { 3731 rc = sata_link_resume(link, timing, deadline); 3732 /* whine about phy resume failure but proceed */ 3733 if (rc && rc != -EOPNOTSUPP) 3734 ata_link_printk(link, KERN_WARNING, "failed to resume " 3735 "link for reset (errno=%d)\n", rc); 3736 } 3737 3738 /* no point in trying softreset on offline link */ 3739 if (ata_phys_link_offline(link)) 3740 ehc->i.action &= ~ATA_EH_SOFTRESET; 3741 3742 return 0; 3743 } 3744 3745 /** 3746 * sata_link_hardreset - reset link via SATA phy reset 3747 * @link: link to reset 3748 * @timing: timing parameters { interval, duratinon, timeout } in msec 3749 * @deadline: deadline jiffies for the operation 3750 * @online: optional out parameter indicating link onlineness 3751 * @check_ready: optional callback to check link readiness 3752 * 3753 * SATA phy-reset @link using DET bits of SControl register. 3754 * After hardreset, link readiness is waited upon using 3755 * ata_wait_ready() if @check_ready is specified. LLDs are 3756 * allowed to not specify @check_ready and wait itself after this 3757 * function returns. Device classification is LLD's 3758 * responsibility. 3759 * 3760 * *@online is set to one iff reset succeeded and @link is online 3761 * after reset. 3762 * 3763 * LOCKING: 3764 * Kernel thread context (may sleep) 3765 * 3766 * RETURNS: 3767 * 0 on success, -errno otherwise. 3768 */ 3769 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing, 3770 unsigned long deadline, 3771 bool *online, int (*check_ready)(struct ata_link *)) 3772 { 3773 u32 scontrol; 3774 int rc; 3775 3776 DPRINTK("ENTER\n"); 3777 3778 if (online) 3779 *online = false; 3780 3781 if (sata_set_spd_needed(link)) { 3782 /* SATA spec says nothing about how to reconfigure 3783 * spd. To be on the safe side, turn off phy during 3784 * reconfiguration. This works for at least ICH7 AHCI 3785 * and Sil3124. 3786 */ 3787 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol))) 3788 goto out; 3789 3790 scontrol = (scontrol & 0x0f0) | 0x304; 3791 3792 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol))) 3793 goto out; 3794 3795 sata_set_spd(link); 3796 } 3797 3798 /* issue phy wake/reset */ 3799 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol))) 3800 goto out; 3801 3802 scontrol = (scontrol & 0x0f0) | 0x301; 3803 3804 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol))) 3805 goto out; 3806 3807 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1 3808 * 10.4.2 says at least 1 ms. 3809 */ 3810 msleep(1); 3811 3812 /* bring link back */ 3813 rc = sata_link_resume(link, timing, deadline); 3814 if (rc) 3815 goto out; 3816 /* if link is offline nothing more to do */ 3817 if (ata_phys_link_offline(link)) 3818 goto out; 3819 3820 /* Link is online. From this point, -ENODEV too is an error. */ 3821 if (online) 3822 *online = true; 3823 3824 if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) { 3825 /* If PMP is supported, we have to do follow-up SRST. 3826 * Some PMPs don't send D2H Reg FIS after hardreset if 3827 * the first port is empty. Wait only for 3828 * ATA_TMOUT_PMP_SRST_WAIT. 3829 */ 3830 if (check_ready) { 3831 unsigned long pmp_deadline; 3832 3833 pmp_deadline = ata_deadline(jiffies, 3834 ATA_TMOUT_PMP_SRST_WAIT); 3835 if (time_after(pmp_deadline, deadline)) 3836 pmp_deadline = deadline; 3837 ata_wait_ready(link, pmp_deadline, check_ready); 3838 } 3839 rc = -EAGAIN; 3840 goto out; 3841 } 3842 3843 rc = 0; 3844 if (check_ready) 3845 rc = ata_wait_ready(link, deadline, check_ready); 3846 out: 3847 if (rc && rc != -EAGAIN) { 3848 /* online is set iff link is online && reset succeeded */ 3849 if (online) 3850 *online = false; 3851 ata_link_printk(link, KERN_ERR, 3852 "COMRESET failed (errno=%d)\n", rc); 3853 } 3854 DPRINTK("EXIT, rc=%d\n", rc); 3855 return rc; 3856 } 3857 3858 /** 3859 * sata_std_hardreset - COMRESET w/o waiting or classification 3860 * @link: link to reset 3861 * @class: resulting class of attached device 3862 * @deadline: deadline jiffies for the operation 3863 * 3864 * Standard SATA COMRESET w/o waiting or classification. 3865 * 3866 * LOCKING: 3867 * Kernel thread context (may sleep) 3868 * 3869 * RETURNS: 3870 * 0 if link offline, -EAGAIN if link online, -errno on errors. 3871 */ 3872 int sata_std_hardreset(struct ata_link *link, unsigned int *class, 3873 unsigned long deadline) 3874 { 3875 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context); 3876 bool online; 3877 int rc; 3878 3879 /* do hardreset */ 3880 rc = sata_link_hardreset(link, timing, deadline, &online, NULL); 3881 return online ? -EAGAIN : rc; 3882 } 3883 3884 /** 3885 * ata_std_postreset - standard postreset callback 3886 * @link: the target ata_link 3887 * @classes: classes of attached devices 3888 * 3889 * This function is invoked after a successful reset. Note that 3890 * the device might have been reset more than once using 3891 * different reset methods before postreset is invoked. 3892 * 3893 * LOCKING: 3894 * Kernel thread context (may sleep) 3895 */ 3896 void ata_std_postreset(struct ata_link *link, unsigned int *classes) 3897 { 3898 u32 serror; 3899 3900 DPRINTK("ENTER\n"); 3901 3902 /* reset complete, clear SError */ 3903 if (!sata_scr_read(link, SCR_ERROR, &serror)) 3904 sata_scr_write(link, SCR_ERROR, serror); 3905 3906 /* print link status */ 3907 sata_print_link_status(link); 3908 3909 DPRINTK("EXIT\n"); 3910 } 3911 3912 /** 3913 * ata_dev_same_device - Determine whether new ID matches configured device 3914 * @dev: device to compare against 3915 * @new_class: class of the new device 3916 * @new_id: IDENTIFY page of the new device 3917 * 3918 * Compare @new_class and @new_id against @dev and determine 3919 * whether @dev is the device indicated by @new_class and 3920 * @new_id. 3921 * 3922 * LOCKING: 3923 * None. 3924 * 3925 * RETURNS: 3926 * 1 if @dev matches @new_class and @new_id, 0 otherwise. 3927 */ 3928 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class, 3929 const u16 *new_id) 3930 { 3931 const u16 *old_id = dev->id; 3932 unsigned char model[2][ATA_ID_PROD_LEN + 1]; 3933 unsigned char serial[2][ATA_ID_SERNO_LEN + 1]; 3934 3935 if (dev->class != new_class) { 3936 ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n", 3937 dev->class, new_class); 3938 return 0; 3939 } 3940 3941 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0])); 3942 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1])); 3943 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0])); 3944 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1])); 3945 3946 if (strcmp(model[0], model[1])) { 3947 ata_dev_printk(dev, KERN_INFO, "model number mismatch " 3948 "'%s' != '%s'\n", model[0], model[1]); 3949 return 0; 3950 } 3951 3952 if (strcmp(serial[0], serial[1])) { 3953 ata_dev_printk(dev, KERN_INFO, "serial number mismatch " 3954 "'%s' != '%s'\n", serial[0], serial[1]); 3955 return 0; 3956 } 3957 3958 return 1; 3959 } 3960 3961 /** 3962 * ata_dev_reread_id - Re-read IDENTIFY data 3963 * @dev: target ATA device 3964 * @readid_flags: read ID flags 3965 * 3966 * Re-read IDENTIFY page and make sure @dev is still attached to 3967 * the port. 3968 * 3969 * LOCKING: 3970 * Kernel thread context (may sleep) 3971 * 3972 * RETURNS: 3973 * 0 on success, negative errno otherwise 3974 */ 3975 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags) 3976 { 3977 unsigned int class = dev->class; 3978 u16 *id = (void *)dev->link->ap->sector_buf; 3979 int rc; 3980 3981 /* read ID data */ 3982 rc = ata_dev_read_id(dev, &class, readid_flags, id); 3983 if (rc) 3984 return rc; 3985 3986 /* is the device still there? */ 3987 if (!ata_dev_same_device(dev, class, id)) 3988 return -ENODEV; 3989 3990 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS); 3991 return 0; 3992 } 3993 3994 /** 3995 * ata_dev_revalidate - Revalidate ATA device 3996 * @dev: device to revalidate 3997 * @new_class: new class code 3998 * @readid_flags: read ID flags 3999 * 4000 * Re-read IDENTIFY page, make sure @dev is still attached to the 4001 * port and reconfigure it according to the new IDENTIFY page. 4002 * 4003 * LOCKING: 4004 * Kernel thread context (may sleep) 4005 * 4006 * RETURNS: 4007 * 0 on success, negative errno otherwise 4008 */ 4009 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class, 4010 unsigned int readid_flags) 4011 { 4012 u64 n_sectors = dev->n_sectors; 4013 int rc; 4014 4015 if (!ata_dev_enabled(dev)) 4016 return -ENODEV; 4017 4018 /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */ 4019 if (ata_class_enabled(new_class) && 4020 new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) { 4021 ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n", 4022 dev->class, new_class); 4023 rc = -ENODEV; 4024 goto fail; 4025 } 4026 4027 /* re-read ID */ 4028 rc = ata_dev_reread_id(dev, readid_flags); 4029 if (rc) 4030 goto fail; 4031 4032 /* configure device according to the new ID */ 4033 rc = ata_dev_configure(dev); 4034 if (rc) 4035 goto fail; 4036 4037 /* verify n_sectors hasn't changed */ 4038 if (dev->class == ATA_DEV_ATA && n_sectors && 4039 dev->n_sectors != n_sectors) { 4040 ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch " 4041 "%llu != %llu\n", 4042 (unsigned long long)n_sectors, 4043 (unsigned long long)dev->n_sectors); 4044 4045 /* restore original n_sectors */ 4046 dev->n_sectors = n_sectors; 4047 4048 rc = -ENODEV; 4049 goto fail; 4050 } 4051 4052 return 0; 4053 4054 fail: 4055 ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc); 4056 return rc; 4057 } 4058 4059 struct ata_blacklist_entry { 4060 const char *model_num; 4061 const char *model_rev; 4062 unsigned long horkage; 4063 }; 4064 4065 static const struct ata_blacklist_entry ata_device_blacklist [] = { 4066 /* Devices with DMA related problems under Linux */ 4067 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA }, 4068 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA }, 4069 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA }, 4070 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA }, 4071 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA }, 4072 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA }, 4073 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA }, 4074 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA }, 4075 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA }, 4076 { "CRD-8480B", NULL, ATA_HORKAGE_NODMA }, 4077 { "CRD-8482B", NULL, ATA_HORKAGE_NODMA }, 4078 { "CRD-84", NULL, ATA_HORKAGE_NODMA }, 4079 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA }, 4080 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA }, 4081 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA }, 4082 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA }, 4083 { "HITACHI CDR-8335", NULL, ATA_HORKAGE_NODMA }, 4084 { "HITACHI CDR-8435", NULL, ATA_HORKAGE_NODMA }, 4085 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA }, 4086 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA }, 4087 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA }, 4088 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA }, 4089 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA }, 4090 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA }, 4091 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA }, 4092 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA }, 4093 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA }, 4094 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA }, 4095 { "SAMSUNG CD-ROM SN-124", "N001", ATA_HORKAGE_NODMA }, 4096 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA }, 4097 /* Odd clown on sil3726/4726 PMPs */ 4098 { "Config Disk", NULL, ATA_HORKAGE_DISABLE }, 4099 4100 /* Weird ATAPI devices */ 4101 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 }, 4102 { "QUANTUM DAT DAT72-000", NULL, ATA_HORKAGE_ATAPI_MOD16_DMA }, 4103 4104 /* Devices we expect to fail diagnostics */ 4105 4106 /* Devices where NCQ should be avoided */ 4107 /* NCQ is slow */ 4108 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ }, 4109 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, }, 4110 /* http://thread.gmane.org/gmane.linux.ide/14907 */ 4111 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ }, 4112 /* NCQ is broken */ 4113 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ }, 4114 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ }, 4115 { "ST380817AS", "3.42", ATA_HORKAGE_NONCQ }, 4116 { "ST3160023AS", "3.42", ATA_HORKAGE_NONCQ }, 4117 { "OCZ CORE_SSD", "02.10104", ATA_HORKAGE_NONCQ }, 4118 4119 /* Seagate NCQ + FLUSH CACHE firmware bug */ 4120 { "ST31500341AS", "SD15", ATA_HORKAGE_NONCQ | 4121 ATA_HORKAGE_FIRMWARE_WARN }, 4122 { "ST31500341AS", "SD16", ATA_HORKAGE_NONCQ | 4123 ATA_HORKAGE_FIRMWARE_WARN }, 4124 { "ST31500341AS", "SD17", ATA_HORKAGE_NONCQ | 4125 ATA_HORKAGE_FIRMWARE_WARN }, 4126 { "ST31500341AS", "SD18", ATA_HORKAGE_NONCQ | 4127 ATA_HORKAGE_FIRMWARE_WARN }, 4128 { "ST31500341AS", "SD19", ATA_HORKAGE_NONCQ | 4129 ATA_HORKAGE_FIRMWARE_WARN }, 4130 4131 { "ST31000333AS", "SD15", ATA_HORKAGE_NONCQ | 4132 ATA_HORKAGE_FIRMWARE_WARN }, 4133 { "ST31000333AS", "SD16", ATA_HORKAGE_NONCQ | 4134 ATA_HORKAGE_FIRMWARE_WARN }, 4135 { "ST31000333AS", "SD17", ATA_HORKAGE_NONCQ | 4136 ATA_HORKAGE_FIRMWARE_WARN }, 4137 { "ST31000333AS", "SD18", ATA_HORKAGE_NONCQ | 4138 ATA_HORKAGE_FIRMWARE_WARN }, 4139 { "ST31000333AS", "SD19", ATA_HORKAGE_NONCQ | 4140 ATA_HORKAGE_FIRMWARE_WARN }, 4141 4142 { "ST3640623AS", "SD15", ATA_HORKAGE_NONCQ | 4143 ATA_HORKAGE_FIRMWARE_WARN }, 4144 { "ST3640623AS", "SD16", ATA_HORKAGE_NONCQ | 4145 ATA_HORKAGE_FIRMWARE_WARN }, 4146 { "ST3640623AS", "SD17", ATA_HORKAGE_NONCQ | 4147 ATA_HORKAGE_FIRMWARE_WARN }, 4148 { "ST3640623AS", "SD18", ATA_HORKAGE_NONCQ | 4149 ATA_HORKAGE_FIRMWARE_WARN }, 4150 { "ST3640623AS", "SD19", ATA_HORKAGE_NONCQ | 4151 ATA_HORKAGE_FIRMWARE_WARN }, 4152 4153 { "ST3640323AS", "SD15", ATA_HORKAGE_NONCQ | 4154 ATA_HORKAGE_FIRMWARE_WARN }, 4155 { "ST3640323AS", "SD16", ATA_HORKAGE_NONCQ | 4156 ATA_HORKAGE_FIRMWARE_WARN }, 4157 { "ST3640323AS", "SD17", ATA_HORKAGE_NONCQ | 4158 ATA_HORKAGE_FIRMWARE_WARN }, 4159 { "ST3640323AS", "SD18", ATA_HORKAGE_NONCQ | 4160 ATA_HORKAGE_FIRMWARE_WARN }, 4161 { "ST3640323AS", "SD19", ATA_HORKAGE_NONCQ | 4162 ATA_HORKAGE_FIRMWARE_WARN }, 4163 4164 { "ST3320813AS", "SD15", ATA_HORKAGE_NONCQ | 4165 ATA_HORKAGE_FIRMWARE_WARN }, 4166 { "ST3320813AS", "SD16", ATA_HORKAGE_NONCQ | 4167 ATA_HORKAGE_FIRMWARE_WARN }, 4168 { "ST3320813AS", "SD17", ATA_HORKAGE_NONCQ | 4169 ATA_HORKAGE_FIRMWARE_WARN }, 4170 { "ST3320813AS", "SD18", ATA_HORKAGE_NONCQ | 4171 ATA_HORKAGE_FIRMWARE_WARN }, 4172 { "ST3320813AS", "SD19", ATA_HORKAGE_NONCQ | 4173 ATA_HORKAGE_FIRMWARE_WARN }, 4174 4175 { "ST3320613AS", "SD15", ATA_HORKAGE_NONCQ | 4176 ATA_HORKAGE_FIRMWARE_WARN }, 4177 { "ST3320613AS", "SD16", ATA_HORKAGE_NONCQ | 4178 ATA_HORKAGE_FIRMWARE_WARN }, 4179 { "ST3320613AS", "SD17", ATA_HORKAGE_NONCQ | 4180 ATA_HORKAGE_FIRMWARE_WARN }, 4181 { "ST3320613AS", "SD18", ATA_HORKAGE_NONCQ | 4182 ATA_HORKAGE_FIRMWARE_WARN }, 4183 { "ST3320613AS", "SD19", ATA_HORKAGE_NONCQ | 4184 ATA_HORKAGE_FIRMWARE_WARN }, 4185 4186 /* Blacklist entries taken from Silicon Image 3124/3132 4187 Windows driver .inf file - also several Linux problem reports */ 4188 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, }, 4189 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, }, 4190 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, }, 4191 4192 /* devices which puke on READ_NATIVE_MAX */ 4193 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, }, 4194 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA }, 4195 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA }, 4196 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA }, 4197 4198 /* Devices which report 1 sector over size HPA */ 4199 { "ST340823A", NULL, ATA_HORKAGE_HPA_SIZE, }, 4200 { "ST320413A", NULL, ATA_HORKAGE_HPA_SIZE, }, 4201 { "ST310211A", NULL, ATA_HORKAGE_HPA_SIZE, }, 4202 4203 /* Devices which get the IVB wrong */ 4204 { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, }, 4205 /* Maybe we should just blacklist TSSTcorp... */ 4206 { "TSSTcorp CDDVDW SH-S202H", "SB00", ATA_HORKAGE_IVB, }, 4207 { "TSSTcorp CDDVDW SH-S202H", "SB01", ATA_HORKAGE_IVB, }, 4208 { "TSSTcorp CDDVDW SH-S202J", "SB00", ATA_HORKAGE_IVB, }, 4209 { "TSSTcorp CDDVDW SH-S202J", "SB01", ATA_HORKAGE_IVB, }, 4210 { "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, }, 4211 { "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, }, 4212 4213 /* Devices that do not need bridging limits applied */ 4214 { "MTRON MSP-SATA*", NULL, ATA_HORKAGE_BRIDGE_OK, }, 4215 4216 /* End Marker */ 4217 { } 4218 }; 4219 4220 static int strn_pattern_cmp(const char *patt, const char *name, int wildchar) 4221 { 4222 const char *p; 4223 int len; 4224 4225 /* 4226 * check for trailing wildcard: *\0 4227 */ 4228 p = strchr(patt, wildchar); 4229 if (p && ((*(p + 1)) == 0)) 4230 len = p - patt; 4231 else { 4232 len = strlen(name); 4233 if (!len) { 4234 if (!*patt) 4235 return 0; 4236 return -1; 4237 } 4238 } 4239 4240 return strncmp(patt, name, len); 4241 } 4242 4243 static unsigned long ata_dev_blacklisted(const struct ata_device *dev) 4244 { 4245 unsigned char model_num[ATA_ID_PROD_LEN + 1]; 4246 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1]; 4247 const struct ata_blacklist_entry *ad = ata_device_blacklist; 4248 4249 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num)); 4250 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev)); 4251 4252 while (ad->model_num) { 4253 if (!strn_pattern_cmp(ad->model_num, model_num, '*')) { 4254 if (ad->model_rev == NULL) 4255 return ad->horkage; 4256 if (!strn_pattern_cmp(ad->model_rev, model_rev, '*')) 4257 return ad->horkage; 4258 } 4259 ad++; 4260 } 4261 return 0; 4262 } 4263 4264 static int ata_dma_blacklisted(const struct ata_device *dev) 4265 { 4266 /* We don't support polling DMA. 4267 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO) 4268 * if the LLDD handles only interrupts in the HSM_ST_LAST state. 4269 */ 4270 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) && 4271 (dev->flags & ATA_DFLAG_CDB_INTR)) 4272 return 1; 4273 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0; 4274 } 4275 4276 /** 4277 * ata_is_40wire - check drive side detection 4278 * @dev: device 4279 * 4280 * Perform drive side detection decoding, allowing for device vendors 4281 * who can't follow the documentation. 4282 */ 4283 4284 static int ata_is_40wire(struct ata_device *dev) 4285 { 4286 if (dev->horkage & ATA_HORKAGE_IVB) 4287 return ata_drive_40wire_relaxed(dev->id); 4288 return ata_drive_40wire(dev->id); 4289 } 4290 4291 /** 4292 * cable_is_40wire - 40/80/SATA decider 4293 * @ap: port to consider 4294 * 4295 * This function encapsulates the policy for speed management 4296 * in one place. At the moment we don't cache the result but 4297 * there is a good case for setting ap->cbl to the result when 4298 * we are called with unknown cables (and figuring out if it 4299 * impacts hotplug at all). 4300 * 4301 * Return 1 if the cable appears to be 40 wire. 4302 */ 4303 4304 static int cable_is_40wire(struct ata_port *ap) 4305 { 4306 struct ata_link *link; 4307 struct ata_device *dev; 4308 4309 /* If the controller thinks we are 40 wire, we are. */ 4310 if (ap->cbl == ATA_CBL_PATA40) 4311 return 1; 4312 4313 /* If the controller thinks we are 80 wire, we are. */ 4314 if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA) 4315 return 0; 4316 4317 /* If the system is known to be 40 wire short cable (eg 4318 * laptop), then we allow 80 wire modes even if the drive 4319 * isn't sure. 4320 */ 4321 if (ap->cbl == ATA_CBL_PATA40_SHORT) 4322 return 0; 4323 4324 /* If the controller doesn't know, we scan. 4325 * 4326 * Note: We look for all 40 wire detects at this point. Any 4327 * 80 wire detect is taken to be 80 wire cable because 4328 * - in many setups only the one drive (slave if present) will 4329 * give a valid detect 4330 * - if you have a non detect capable drive you don't want it 4331 * to colour the choice 4332 */ 4333 ata_for_each_link(link, ap, EDGE) { 4334 ata_for_each_dev(dev, link, ENABLED) { 4335 if (!ata_is_40wire(dev)) 4336 return 0; 4337 } 4338 } 4339 return 1; 4340 } 4341 4342 /** 4343 * ata_dev_xfermask - Compute supported xfermask of the given device 4344 * @dev: Device to compute xfermask for 4345 * 4346 * Compute supported xfermask of @dev and store it in 4347 * dev->*_mask. This function is responsible for applying all 4348 * known limits including host controller limits, device 4349 * blacklist, etc... 4350 * 4351 * LOCKING: 4352 * None. 4353 */ 4354 static void ata_dev_xfermask(struct ata_device *dev) 4355 { 4356 struct ata_link *link = dev->link; 4357 struct ata_port *ap = link->ap; 4358 struct ata_host *host = ap->host; 4359 unsigned long xfer_mask; 4360 4361 /* controller modes available */ 4362 xfer_mask = ata_pack_xfermask(ap->pio_mask, 4363 ap->mwdma_mask, ap->udma_mask); 4364 4365 /* drive modes available */ 4366 xfer_mask &= ata_pack_xfermask(dev->pio_mask, 4367 dev->mwdma_mask, dev->udma_mask); 4368 xfer_mask &= ata_id_xfermask(dev->id); 4369 4370 /* 4371 * CFA Advanced TrueIDE timings are not allowed on a shared 4372 * cable 4373 */ 4374 if (ata_dev_pair(dev)) { 4375 /* No PIO5 or PIO6 */ 4376 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5)); 4377 /* No MWDMA3 or MWDMA 4 */ 4378 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3)); 4379 } 4380 4381 if (ata_dma_blacklisted(dev)) { 4382 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA); 4383 ata_dev_printk(dev, KERN_WARNING, 4384 "device is on DMA blacklist, disabling DMA\n"); 4385 } 4386 4387 if ((host->flags & ATA_HOST_SIMPLEX) && 4388 host->simplex_claimed && host->simplex_claimed != ap) { 4389 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA); 4390 ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by " 4391 "other device, disabling DMA\n"); 4392 } 4393 4394 if (ap->flags & ATA_FLAG_NO_IORDY) 4395 xfer_mask &= ata_pio_mask_no_iordy(dev); 4396 4397 if (ap->ops->mode_filter) 4398 xfer_mask = ap->ops->mode_filter(dev, xfer_mask); 4399 4400 /* Apply cable rule here. Don't apply it early because when 4401 * we handle hot plug the cable type can itself change. 4402 * Check this last so that we know if the transfer rate was 4403 * solely limited by the cable. 4404 * Unknown or 80 wire cables reported host side are checked 4405 * drive side as well. Cases where we know a 40wire cable 4406 * is used safely for 80 are not checked here. 4407 */ 4408 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA)) 4409 /* UDMA/44 or higher would be available */ 4410 if (cable_is_40wire(ap)) { 4411 ata_dev_printk(dev, KERN_WARNING, 4412 "limited to UDMA/33 due to 40-wire cable\n"); 4413 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA); 4414 } 4415 4416 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, 4417 &dev->mwdma_mask, &dev->udma_mask); 4418 } 4419 4420 /** 4421 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command 4422 * @dev: Device to which command will be sent 4423 * 4424 * Issue SET FEATURES - XFER MODE command to device @dev 4425 * on port @ap. 4426 * 4427 * LOCKING: 4428 * PCI/etc. bus probe sem. 4429 * 4430 * RETURNS: 4431 * 0 on success, AC_ERR_* mask otherwise. 4432 */ 4433 4434 static unsigned int ata_dev_set_xfermode(struct ata_device *dev) 4435 { 4436 struct ata_taskfile tf; 4437 unsigned int err_mask; 4438 4439 /* set up set-features taskfile */ 4440 DPRINTK("set features - xfer mode\n"); 4441 4442 /* Some controllers and ATAPI devices show flaky interrupt 4443 * behavior after setting xfer mode. Use polling instead. 4444 */ 4445 ata_tf_init(dev, &tf); 4446 tf.command = ATA_CMD_SET_FEATURES; 4447 tf.feature = SETFEATURES_XFER; 4448 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING; 4449 tf.protocol = ATA_PROT_NODATA; 4450 /* If we are using IORDY we must send the mode setting command */ 4451 if (ata_pio_need_iordy(dev)) 4452 tf.nsect = dev->xfer_mode; 4453 /* If the device has IORDY and the controller does not - turn it off */ 4454 else if (ata_id_has_iordy(dev->id)) 4455 tf.nsect = 0x01; 4456 else /* In the ancient relic department - skip all of this */ 4457 return 0; 4458 4459 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0); 4460 4461 DPRINTK("EXIT, err_mask=%x\n", err_mask); 4462 return err_mask; 4463 } 4464 /** 4465 * ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES 4466 * @dev: Device to which command will be sent 4467 * @enable: Whether to enable or disable the feature 4468 * @feature: The sector count represents the feature to set 4469 * 4470 * Issue SET FEATURES - SATA FEATURES command to device @dev 4471 * on port @ap with sector count 4472 * 4473 * LOCKING: 4474 * PCI/etc. bus probe sem. 4475 * 4476 * RETURNS: 4477 * 0 on success, AC_ERR_* mask otherwise. 4478 */ 4479 static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable, 4480 u8 feature) 4481 { 4482 struct ata_taskfile tf; 4483 unsigned int err_mask; 4484 4485 /* set up set-features taskfile */ 4486 DPRINTK("set features - SATA features\n"); 4487 4488 ata_tf_init(dev, &tf); 4489 tf.command = ATA_CMD_SET_FEATURES; 4490 tf.feature = enable; 4491 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 4492 tf.protocol = ATA_PROT_NODATA; 4493 tf.nsect = feature; 4494 4495 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0); 4496 4497 DPRINTK("EXIT, err_mask=%x\n", err_mask); 4498 return err_mask; 4499 } 4500 4501 /** 4502 * ata_dev_init_params - Issue INIT DEV PARAMS command 4503 * @dev: Device to which command will be sent 4504 * @heads: Number of heads (taskfile parameter) 4505 * @sectors: Number of sectors (taskfile parameter) 4506 * 4507 * LOCKING: 4508 * Kernel thread context (may sleep) 4509 * 4510 * RETURNS: 4511 * 0 on success, AC_ERR_* mask otherwise. 4512 */ 4513 static unsigned int ata_dev_init_params(struct ata_device *dev, 4514 u16 heads, u16 sectors) 4515 { 4516 struct ata_taskfile tf; 4517 unsigned int err_mask; 4518 4519 /* Number of sectors per track 1-255. Number of heads 1-16 */ 4520 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16) 4521 return AC_ERR_INVALID; 4522 4523 /* set up init dev params taskfile */ 4524 DPRINTK("init dev params \n"); 4525 4526 ata_tf_init(dev, &tf); 4527 tf.command = ATA_CMD_INIT_DEV_PARAMS; 4528 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; 4529 tf.protocol = ATA_PROT_NODATA; 4530 tf.nsect = sectors; 4531 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */ 4532 4533 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0); 4534 /* A clean abort indicates an original or just out of spec drive 4535 and we should continue as we issue the setup based on the 4536 drive reported working geometry */ 4537 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED)) 4538 err_mask = 0; 4539 4540 DPRINTK("EXIT, err_mask=%x\n", err_mask); 4541 return err_mask; 4542 } 4543 4544 /** 4545 * ata_sg_clean - Unmap DMA memory associated with command 4546 * @qc: Command containing DMA memory to be released 4547 * 4548 * Unmap all mapped DMA memory associated with this command. 4549 * 4550 * LOCKING: 4551 * spin_lock_irqsave(host lock) 4552 */ 4553 void ata_sg_clean(struct ata_queued_cmd *qc) 4554 { 4555 struct ata_port *ap = qc->ap; 4556 struct scatterlist *sg = qc->sg; 4557 int dir = qc->dma_dir; 4558 4559 WARN_ON_ONCE(sg == NULL); 4560 4561 VPRINTK("unmapping %u sg elements\n", qc->n_elem); 4562 4563 if (qc->n_elem) 4564 dma_unmap_sg(ap->dev, sg, qc->n_elem, dir); 4565 4566 qc->flags &= ~ATA_QCFLAG_DMAMAP; 4567 qc->sg = NULL; 4568 } 4569 4570 /** 4571 * atapi_check_dma - Check whether ATAPI DMA can be supported 4572 * @qc: Metadata associated with taskfile to check 4573 * 4574 * Allow low-level driver to filter ATA PACKET commands, returning 4575 * a status indicating whether or not it is OK to use DMA for the 4576 * supplied PACKET command. 4577 * 4578 * LOCKING: 4579 * spin_lock_irqsave(host lock) 4580 * 4581 * RETURNS: 0 when ATAPI DMA can be used 4582 * nonzero otherwise 4583 */ 4584 int atapi_check_dma(struct ata_queued_cmd *qc) 4585 { 4586 struct ata_port *ap = qc->ap; 4587 4588 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a 4589 * few ATAPI devices choke on such DMA requests. 4590 */ 4591 if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) && 4592 unlikely(qc->nbytes & 15)) 4593 return 1; 4594 4595 if (ap->ops->check_atapi_dma) 4596 return ap->ops->check_atapi_dma(qc); 4597 4598 return 0; 4599 } 4600 4601 /** 4602 * ata_std_qc_defer - Check whether a qc needs to be deferred 4603 * @qc: ATA command in question 4604 * 4605 * Non-NCQ commands cannot run with any other command, NCQ or 4606 * not. As upper layer only knows the queue depth, we are 4607 * responsible for maintaining exclusion. This function checks 4608 * whether a new command @qc can be issued. 4609 * 4610 * LOCKING: 4611 * spin_lock_irqsave(host lock) 4612 * 4613 * RETURNS: 4614 * ATA_DEFER_* if deferring is needed, 0 otherwise. 4615 */ 4616 int ata_std_qc_defer(struct ata_queued_cmd *qc) 4617 { 4618 struct ata_link *link = qc->dev->link; 4619 4620 if (qc->tf.protocol == ATA_PROT_NCQ) { 4621 if (!ata_tag_valid(link->active_tag)) 4622 return 0; 4623 } else { 4624 if (!ata_tag_valid(link->active_tag) && !link->sactive) 4625 return 0; 4626 } 4627 4628 return ATA_DEFER_LINK; 4629 } 4630 4631 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { } 4632 4633 /** 4634 * ata_sg_init - Associate command with scatter-gather table. 4635 * @qc: Command to be associated 4636 * @sg: Scatter-gather table. 4637 * @n_elem: Number of elements in s/g table. 4638 * 4639 * Initialize the data-related elements of queued_cmd @qc 4640 * to point to a scatter-gather table @sg, containing @n_elem 4641 * elements. 4642 * 4643 * LOCKING: 4644 * spin_lock_irqsave(host lock) 4645 */ 4646 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg, 4647 unsigned int n_elem) 4648 { 4649 qc->sg = sg; 4650 qc->n_elem = n_elem; 4651 qc->cursg = qc->sg; 4652 } 4653 4654 /** 4655 * ata_sg_setup - DMA-map the scatter-gather table associated with a command. 4656 * @qc: Command with scatter-gather table to be mapped. 4657 * 4658 * DMA-map the scatter-gather table associated with queued_cmd @qc. 4659 * 4660 * LOCKING: 4661 * spin_lock_irqsave(host lock) 4662 * 4663 * RETURNS: 4664 * Zero on success, negative on error. 4665 * 4666 */ 4667 static int ata_sg_setup(struct ata_queued_cmd *qc) 4668 { 4669 struct ata_port *ap = qc->ap; 4670 unsigned int n_elem; 4671 4672 VPRINTK("ENTER, ata%u\n", ap->print_id); 4673 4674 n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir); 4675 if (n_elem < 1) 4676 return -1; 4677 4678 DPRINTK("%d sg elements mapped\n", n_elem); 4679 4680 qc->n_elem = n_elem; 4681 qc->flags |= ATA_QCFLAG_DMAMAP; 4682 4683 return 0; 4684 } 4685 4686 /** 4687 * swap_buf_le16 - swap halves of 16-bit words in place 4688 * @buf: Buffer to swap 4689 * @buf_words: Number of 16-bit words in buffer. 4690 * 4691 * Swap halves of 16-bit words if needed to convert from 4692 * little-endian byte order to native cpu byte order, or 4693 * vice-versa. 4694 * 4695 * LOCKING: 4696 * Inherited from caller. 4697 */ 4698 void swap_buf_le16(u16 *buf, unsigned int buf_words) 4699 { 4700 #ifdef __BIG_ENDIAN 4701 unsigned int i; 4702 4703 for (i = 0; i < buf_words; i++) 4704 buf[i] = le16_to_cpu(buf[i]); 4705 #endif /* __BIG_ENDIAN */ 4706 } 4707 4708 /** 4709 * ata_qc_new - Request an available ATA command, for queueing 4710 * @ap: Port associated with device @dev 4711 * @dev: Device from whom we request an available command structure 4712 * 4713 * LOCKING: 4714 * None. 4715 */ 4716 4717 static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap) 4718 { 4719 struct ata_queued_cmd *qc = NULL; 4720 unsigned int i; 4721 4722 /* no command while frozen */ 4723 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) 4724 return NULL; 4725 4726 /* the last tag is reserved for internal command. */ 4727 for (i = 0; i < ATA_MAX_QUEUE - 1; i++) 4728 if (!test_and_set_bit(i, &ap->qc_allocated)) { 4729 qc = __ata_qc_from_tag(ap, i); 4730 break; 4731 } 4732 4733 if (qc) 4734 qc->tag = i; 4735 4736 return qc; 4737 } 4738 4739 /** 4740 * ata_qc_new_init - Request an available ATA command, and initialize it 4741 * @dev: Device from whom we request an available command structure 4742 * 4743 * LOCKING: 4744 * None. 4745 */ 4746 4747 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev) 4748 { 4749 struct ata_port *ap = dev->link->ap; 4750 struct ata_queued_cmd *qc; 4751 4752 qc = ata_qc_new(ap); 4753 if (qc) { 4754 qc->scsicmd = NULL; 4755 qc->ap = ap; 4756 qc->dev = dev; 4757 4758 ata_qc_reinit(qc); 4759 } 4760 4761 return qc; 4762 } 4763 4764 /** 4765 * ata_qc_free - free unused ata_queued_cmd 4766 * @qc: Command to complete 4767 * 4768 * Designed to free unused ata_queued_cmd object 4769 * in case something prevents using it. 4770 * 4771 * LOCKING: 4772 * spin_lock_irqsave(host lock) 4773 */ 4774 void ata_qc_free(struct ata_queued_cmd *qc) 4775 { 4776 struct ata_port *ap = qc->ap; 4777 unsigned int tag; 4778 4779 WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */ 4780 4781 qc->flags = 0; 4782 tag = qc->tag; 4783 if (likely(ata_tag_valid(tag))) { 4784 qc->tag = ATA_TAG_POISON; 4785 clear_bit(tag, &ap->qc_allocated); 4786 } 4787 } 4788 4789 void __ata_qc_complete(struct ata_queued_cmd *qc) 4790 { 4791 struct ata_port *ap = qc->ap; 4792 struct ata_link *link = qc->dev->link; 4793 4794 WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */ 4795 WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE)); 4796 4797 if (likely(qc->flags & ATA_QCFLAG_DMAMAP)) 4798 ata_sg_clean(qc); 4799 4800 /* command should be marked inactive atomically with qc completion */ 4801 if (qc->tf.protocol == ATA_PROT_NCQ) { 4802 link->sactive &= ~(1 << qc->tag); 4803 if (!link->sactive) 4804 ap->nr_active_links--; 4805 } else { 4806 link->active_tag = ATA_TAG_POISON; 4807 ap->nr_active_links--; 4808 } 4809 4810 /* clear exclusive status */ 4811 if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL && 4812 ap->excl_link == link)) 4813 ap->excl_link = NULL; 4814 4815 /* atapi: mark qc as inactive to prevent the interrupt handler 4816 * from completing the command twice later, before the error handler 4817 * is called. (when rc != 0 and atapi request sense is needed) 4818 */ 4819 qc->flags &= ~ATA_QCFLAG_ACTIVE; 4820 ap->qc_active &= ~(1 << qc->tag); 4821 4822 /* call completion callback */ 4823 qc->complete_fn(qc); 4824 } 4825 4826 static void fill_result_tf(struct ata_queued_cmd *qc) 4827 { 4828 struct ata_port *ap = qc->ap; 4829 4830 qc->result_tf.flags = qc->tf.flags; 4831 ap->ops->qc_fill_rtf(qc); 4832 } 4833 4834 static void ata_verify_xfer(struct ata_queued_cmd *qc) 4835 { 4836 struct ata_device *dev = qc->dev; 4837 4838 if (ata_tag_internal(qc->tag)) 4839 return; 4840 4841 if (ata_is_nodata(qc->tf.protocol)) 4842 return; 4843 4844 if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol)) 4845 return; 4846 4847 dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER; 4848 } 4849 4850 /** 4851 * ata_qc_complete - Complete an active ATA command 4852 * @qc: Command to complete 4853 * 4854 * Indicate to the mid and upper layers that an ATA 4855 * command has completed, with either an ok or not-ok status. 4856 * 4857 * LOCKING: 4858 * spin_lock_irqsave(host lock) 4859 */ 4860 void ata_qc_complete(struct ata_queued_cmd *qc) 4861 { 4862 struct ata_port *ap = qc->ap; 4863 4864 /* XXX: New EH and old EH use different mechanisms to 4865 * synchronize EH with regular execution path. 4866 * 4867 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED. 4868 * Normal execution path is responsible for not accessing a 4869 * failed qc. libata core enforces the rule by returning NULL 4870 * from ata_qc_from_tag() for failed qcs. 4871 * 4872 * Old EH depends on ata_qc_complete() nullifying completion 4873 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does 4874 * not synchronize with interrupt handler. Only PIO task is 4875 * taken care of. 4876 */ 4877 if (ap->ops->error_handler) { 4878 struct ata_device *dev = qc->dev; 4879 struct ata_eh_info *ehi = &dev->link->eh_info; 4880 4881 WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN); 4882 4883 if (unlikely(qc->err_mask)) 4884 qc->flags |= ATA_QCFLAG_FAILED; 4885 4886 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) { 4887 if (!ata_tag_internal(qc->tag)) { 4888 /* always fill result TF for failed qc */ 4889 fill_result_tf(qc); 4890 ata_qc_schedule_eh(qc); 4891 return; 4892 } 4893 } 4894 4895 /* read result TF if requested */ 4896 if (qc->flags & ATA_QCFLAG_RESULT_TF) 4897 fill_result_tf(qc); 4898 4899 /* Some commands need post-processing after successful 4900 * completion. 4901 */ 4902 switch (qc->tf.command) { 4903 case ATA_CMD_SET_FEATURES: 4904 if (qc->tf.feature != SETFEATURES_WC_ON && 4905 qc->tf.feature != SETFEATURES_WC_OFF) 4906 break; 4907 /* fall through */ 4908 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */ 4909 case ATA_CMD_SET_MULTI: /* multi_count changed */ 4910 /* revalidate device */ 4911 ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE; 4912 ata_port_schedule_eh(ap); 4913 break; 4914 4915 case ATA_CMD_SLEEP: 4916 dev->flags |= ATA_DFLAG_SLEEPING; 4917 break; 4918 } 4919 4920 if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER)) 4921 ata_verify_xfer(qc); 4922 4923 __ata_qc_complete(qc); 4924 } else { 4925 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED) 4926 return; 4927 4928 /* read result TF if failed or requested */ 4929 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF) 4930 fill_result_tf(qc); 4931 4932 __ata_qc_complete(qc); 4933 } 4934 } 4935 4936 /** 4937 * ata_qc_complete_multiple - Complete multiple qcs successfully 4938 * @ap: port in question 4939 * @qc_active: new qc_active mask 4940 * 4941 * Complete in-flight commands. This functions is meant to be 4942 * called from low-level driver's interrupt routine to complete 4943 * requests normally. ap->qc_active and @qc_active is compared 4944 * and commands are completed accordingly. 4945 * 4946 * LOCKING: 4947 * spin_lock_irqsave(host lock) 4948 * 4949 * RETURNS: 4950 * Number of completed commands on success, -errno otherwise. 4951 */ 4952 int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active) 4953 { 4954 int nr_done = 0; 4955 u32 done_mask; 4956 int i; 4957 4958 done_mask = ap->qc_active ^ qc_active; 4959 4960 if (unlikely(done_mask & qc_active)) { 4961 ata_port_printk(ap, KERN_ERR, "illegal qc_active transition " 4962 "(%08x->%08x)\n", ap->qc_active, qc_active); 4963 return -EINVAL; 4964 } 4965 4966 for (i = 0; i < ATA_MAX_QUEUE; i++) { 4967 struct ata_queued_cmd *qc; 4968 4969 if (!(done_mask & (1 << i))) 4970 continue; 4971 4972 if ((qc = ata_qc_from_tag(ap, i))) { 4973 ata_qc_complete(qc); 4974 nr_done++; 4975 } 4976 } 4977 4978 return nr_done; 4979 } 4980 4981 /** 4982 * ata_qc_issue - issue taskfile to device 4983 * @qc: command to issue to device 4984 * 4985 * Prepare an ATA command to submission to device. 4986 * This includes mapping the data into a DMA-able 4987 * area, filling in the S/G table, and finally 4988 * writing the taskfile to hardware, starting the command. 4989 * 4990 * LOCKING: 4991 * spin_lock_irqsave(host lock) 4992 */ 4993 void ata_qc_issue(struct ata_queued_cmd *qc) 4994 { 4995 struct ata_port *ap = qc->ap; 4996 struct ata_link *link = qc->dev->link; 4997 u8 prot = qc->tf.protocol; 4998 4999 /* Make sure only one non-NCQ command is outstanding. The 5000 * check is skipped for old EH because it reuses active qc to 5001 * request ATAPI sense. 5002 */ 5003 WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag)); 5004 5005 if (ata_is_ncq(prot)) { 5006 WARN_ON_ONCE(link->sactive & (1 << qc->tag)); 5007 5008 if (!link->sactive) 5009 ap->nr_active_links++; 5010 link->sactive |= 1 << qc->tag; 5011 } else { 5012 WARN_ON_ONCE(link->sactive); 5013 5014 ap->nr_active_links++; 5015 link->active_tag = qc->tag; 5016 } 5017 5018 qc->flags |= ATA_QCFLAG_ACTIVE; 5019 ap->qc_active |= 1 << qc->tag; 5020 5021 /* We guarantee to LLDs that they will have at least one 5022 * non-zero sg if the command is a data command. 5023 */ 5024 BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes)); 5025 5026 if (ata_is_dma(prot) || (ata_is_pio(prot) && 5027 (ap->flags & ATA_FLAG_PIO_DMA))) 5028 if (ata_sg_setup(qc)) 5029 goto sg_err; 5030 5031 /* if device is sleeping, schedule reset and abort the link */ 5032 if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) { 5033 link->eh_info.action |= ATA_EH_RESET; 5034 ata_ehi_push_desc(&link->eh_info, "waking up from sleep"); 5035 ata_link_abort(link); 5036 return; 5037 } 5038 5039 ap->ops->qc_prep(qc); 5040 5041 qc->err_mask |= ap->ops->qc_issue(qc); 5042 if (unlikely(qc->err_mask)) 5043 goto err; 5044 return; 5045 5046 sg_err: 5047 qc->err_mask |= AC_ERR_SYSTEM; 5048 err: 5049 ata_qc_complete(qc); 5050 } 5051 5052 /** 5053 * sata_scr_valid - test whether SCRs are accessible 5054 * @link: ATA link to test SCR accessibility for 5055 * 5056 * Test whether SCRs are accessible for @link. 5057 * 5058 * LOCKING: 5059 * None. 5060 * 5061 * RETURNS: 5062 * 1 if SCRs are accessible, 0 otherwise. 5063 */ 5064 int sata_scr_valid(struct ata_link *link) 5065 { 5066 struct ata_port *ap = link->ap; 5067 5068 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read; 5069 } 5070 5071 /** 5072 * sata_scr_read - read SCR register of the specified port 5073 * @link: ATA link to read SCR for 5074 * @reg: SCR to read 5075 * @val: Place to store read value 5076 * 5077 * Read SCR register @reg of @link into *@val. This function is 5078 * guaranteed to succeed if @link is ap->link, the cable type of 5079 * the port is SATA and the port implements ->scr_read. 5080 * 5081 * LOCKING: 5082 * None if @link is ap->link. Kernel thread context otherwise. 5083 * 5084 * RETURNS: 5085 * 0 on success, negative errno on failure. 5086 */ 5087 int sata_scr_read(struct ata_link *link, int reg, u32 *val) 5088 { 5089 if (ata_is_host_link(link)) { 5090 if (sata_scr_valid(link)) 5091 return link->ap->ops->scr_read(link, reg, val); 5092 return -EOPNOTSUPP; 5093 } 5094 5095 return sata_pmp_scr_read(link, reg, val); 5096 } 5097 5098 /** 5099 * sata_scr_write - write SCR register of the specified port 5100 * @link: ATA link to write SCR for 5101 * @reg: SCR to write 5102 * @val: value to write 5103 * 5104 * Write @val to SCR register @reg of @link. This function is 5105 * guaranteed to succeed if @link is ap->link, the cable type of 5106 * the port is SATA and the port implements ->scr_read. 5107 * 5108 * LOCKING: 5109 * None if @link is ap->link. Kernel thread context otherwise. 5110 * 5111 * RETURNS: 5112 * 0 on success, negative errno on failure. 5113 */ 5114 int sata_scr_write(struct ata_link *link, int reg, u32 val) 5115 { 5116 if (ata_is_host_link(link)) { 5117 if (sata_scr_valid(link)) 5118 return link->ap->ops->scr_write(link, reg, val); 5119 return -EOPNOTSUPP; 5120 } 5121 5122 return sata_pmp_scr_write(link, reg, val); 5123 } 5124 5125 /** 5126 * sata_scr_write_flush - write SCR register of the specified port and flush 5127 * @link: ATA link to write SCR for 5128 * @reg: SCR to write 5129 * @val: value to write 5130 * 5131 * This function is identical to sata_scr_write() except that this 5132 * function performs flush after writing to the register. 5133 * 5134 * LOCKING: 5135 * None if @link is ap->link. Kernel thread context otherwise. 5136 * 5137 * RETURNS: 5138 * 0 on success, negative errno on failure. 5139 */ 5140 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val) 5141 { 5142 if (ata_is_host_link(link)) { 5143 int rc; 5144 5145 if (sata_scr_valid(link)) { 5146 rc = link->ap->ops->scr_write(link, reg, val); 5147 if (rc == 0) 5148 rc = link->ap->ops->scr_read(link, reg, &val); 5149 return rc; 5150 } 5151 return -EOPNOTSUPP; 5152 } 5153 5154 return sata_pmp_scr_write(link, reg, val); 5155 } 5156 5157 /** 5158 * ata_phys_link_online - test whether the given link is online 5159 * @link: ATA link to test 5160 * 5161 * Test whether @link is online. Note that this function returns 5162 * 0 if online status of @link cannot be obtained, so 5163 * ata_link_online(link) != !ata_link_offline(link). 5164 * 5165 * LOCKING: 5166 * None. 5167 * 5168 * RETURNS: 5169 * True if the port online status is available and online. 5170 */ 5171 bool ata_phys_link_online(struct ata_link *link) 5172 { 5173 u32 sstatus; 5174 5175 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 && 5176 (sstatus & 0xf) == 0x3) 5177 return true; 5178 return false; 5179 } 5180 5181 /** 5182 * ata_phys_link_offline - test whether the given link is offline 5183 * @link: ATA link to test 5184 * 5185 * Test whether @link is offline. Note that this function 5186 * returns 0 if offline status of @link cannot be obtained, so 5187 * ata_link_online(link) != !ata_link_offline(link). 5188 * 5189 * LOCKING: 5190 * None. 5191 * 5192 * RETURNS: 5193 * True if the port offline status is available and offline. 5194 */ 5195 bool ata_phys_link_offline(struct ata_link *link) 5196 { 5197 u32 sstatus; 5198 5199 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 && 5200 (sstatus & 0xf) != 0x3) 5201 return true; 5202 return false; 5203 } 5204 5205 /** 5206 * ata_link_online - test whether the given link is online 5207 * @link: ATA link to test 5208 * 5209 * Test whether @link is online. This is identical to 5210 * ata_phys_link_online() when there's no slave link. When 5211 * there's a slave link, this function should only be called on 5212 * the master link and will return true if any of M/S links is 5213 * online. 5214 * 5215 * LOCKING: 5216 * None. 5217 * 5218 * RETURNS: 5219 * True if the port online status is available and online. 5220 */ 5221 bool ata_link_online(struct ata_link *link) 5222 { 5223 struct ata_link *slave = link->ap->slave_link; 5224 5225 WARN_ON(link == slave); /* shouldn't be called on slave link */ 5226 5227 return ata_phys_link_online(link) || 5228 (slave && ata_phys_link_online(slave)); 5229 } 5230 5231 /** 5232 * ata_link_offline - test whether the given link is offline 5233 * @link: ATA link to test 5234 * 5235 * Test whether @link is offline. This is identical to 5236 * ata_phys_link_offline() when there's no slave link. When 5237 * there's a slave link, this function should only be called on 5238 * the master link and will return true if both M/S links are 5239 * offline. 5240 * 5241 * LOCKING: 5242 * None. 5243 * 5244 * RETURNS: 5245 * True if the port offline status is available and offline. 5246 */ 5247 bool ata_link_offline(struct ata_link *link) 5248 { 5249 struct ata_link *slave = link->ap->slave_link; 5250 5251 WARN_ON(link == slave); /* shouldn't be called on slave link */ 5252 5253 return ata_phys_link_offline(link) && 5254 (!slave || ata_phys_link_offline(slave)); 5255 } 5256 5257 #ifdef CONFIG_PM 5258 static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg, 5259 unsigned int action, unsigned int ehi_flags, 5260 int wait) 5261 { 5262 unsigned long flags; 5263 int i, rc; 5264 5265 for (i = 0; i < host->n_ports; i++) { 5266 struct ata_port *ap = host->ports[i]; 5267 struct ata_link *link; 5268 5269 /* Previous resume operation might still be in 5270 * progress. Wait for PM_PENDING to clear. 5271 */ 5272 if (ap->pflags & ATA_PFLAG_PM_PENDING) { 5273 ata_port_wait_eh(ap); 5274 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING); 5275 } 5276 5277 /* request PM ops to EH */ 5278 spin_lock_irqsave(ap->lock, flags); 5279 5280 ap->pm_mesg = mesg; 5281 if (wait) { 5282 rc = 0; 5283 ap->pm_result = &rc; 5284 } 5285 5286 ap->pflags |= ATA_PFLAG_PM_PENDING; 5287 ata_for_each_link(link, ap, HOST_FIRST) { 5288 link->eh_info.action |= action; 5289 link->eh_info.flags |= ehi_flags; 5290 } 5291 5292 ata_port_schedule_eh(ap); 5293 5294 spin_unlock_irqrestore(ap->lock, flags); 5295 5296 /* wait and check result */ 5297 if (wait) { 5298 ata_port_wait_eh(ap); 5299 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING); 5300 if (rc) 5301 return rc; 5302 } 5303 } 5304 5305 return 0; 5306 } 5307 5308 /** 5309 * ata_host_suspend - suspend host 5310 * @host: host to suspend 5311 * @mesg: PM message 5312 * 5313 * Suspend @host. Actual operation is performed by EH. This 5314 * function requests EH to perform PM operations and waits for EH 5315 * to finish. 5316 * 5317 * LOCKING: 5318 * Kernel thread context (may sleep). 5319 * 5320 * RETURNS: 5321 * 0 on success, -errno on failure. 5322 */ 5323 int ata_host_suspend(struct ata_host *host, pm_message_t mesg) 5324 { 5325 int rc; 5326 5327 /* 5328 * disable link pm on all ports before requesting 5329 * any pm activity 5330 */ 5331 ata_lpm_enable(host); 5332 5333 rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1); 5334 if (rc == 0) 5335 host->dev->power.power_state = mesg; 5336 return rc; 5337 } 5338 5339 /** 5340 * ata_host_resume - resume host 5341 * @host: host to resume 5342 * 5343 * Resume @host. Actual operation is performed by EH. This 5344 * function requests EH to perform PM operations and returns. 5345 * Note that all resume operations are performed parallely. 5346 * 5347 * LOCKING: 5348 * Kernel thread context (may sleep). 5349 */ 5350 void ata_host_resume(struct ata_host *host) 5351 { 5352 ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET, 5353 ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0); 5354 host->dev->power.power_state = PMSG_ON; 5355 5356 /* reenable link pm */ 5357 ata_lpm_disable(host); 5358 } 5359 #endif 5360 5361 /** 5362 * ata_port_start - Set port up for dma. 5363 * @ap: Port to initialize 5364 * 5365 * Called just after data structures for each port are 5366 * initialized. Allocates space for PRD table. 5367 * 5368 * May be used as the port_start() entry in ata_port_operations. 5369 * 5370 * LOCKING: 5371 * Inherited from caller. 5372 */ 5373 int ata_port_start(struct ata_port *ap) 5374 { 5375 struct device *dev = ap->dev; 5376 5377 ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, 5378 GFP_KERNEL); 5379 if (!ap->prd) 5380 return -ENOMEM; 5381 5382 return 0; 5383 } 5384 5385 /** 5386 * ata_dev_init - Initialize an ata_device structure 5387 * @dev: Device structure to initialize 5388 * 5389 * Initialize @dev in preparation for probing. 5390 * 5391 * LOCKING: 5392 * Inherited from caller. 5393 */ 5394 void ata_dev_init(struct ata_device *dev) 5395 { 5396 struct ata_link *link = ata_dev_phys_link(dev); 5397 struct ata_port *ap = link->ap; 5398 unsigned long flags; 5399 5400 /* SATA spd limit is bound to the attached device, reset together */ 5401 link->sata_spd_limit = link->hw_sata_spd_limit; 5402 link->sata_spd = 0; 5403 5404 /* High bits of dev->flags are used to record warm plug 5405 * requests which occur asynchronously. Synchronize using 5406 * host lock. 5407 */ 5408 spin_lock_irqsave(ap->lock, flags); 5409 dev->flags &= ~ATA_DFLAG_INIT_MASK; 5410 dev->horkage = 0; 5411 spin_unlock_irqrestore(ap->lock, flags); 5412 5413 memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0, 5414 sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET); 5415 dev->pio_mask = UINT_MAX; 5416 dev->mwdma_mask = UINT_MAX; 5417 dev->udma_mask = UINT_MAX; 5418 } 5419 5420 /** 5421 * ata_link_init - Initialize an ata_link structure 5422 * @ap: ATA port link is attached to 5423 * @link: Link structure to initialize 5424 * @pmp: Port multiplier port number 5425 * 5426 * Initialize @link. 5427 * 5428 * LOCKING: 5429 * Kernel thread context (may sleep) 5430 */ 5431 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp) 5432 { 5433 int i; 5434 5435 /* clear everything except for devices */ 5436 memset(link, 0, offsetof(struct ata_link, device[0])); 5437 5438 link->ap = ap; 5439 link->pmp = pmp; 5440 link->active_tag = ATA_TAG_POISON; 5441 link->hw_sata_spd_limit = UINT_MAX; 5442 5443 /* can't use iterator, ap isn't initialized yet */ 5444 for (i = 0; i < ATA_MAX_DEVICES; i++) { 5445 struct ata_device *dev = &link->device[i]; 5446 5447 dev->link = link; 5448 dev->devno = dev - link->device; 5449 ata_dev_init(dev); 5450 } 5451 } 5452 5453 /** 5454 * sata_link_init_spd - Initialize link->sata_spd_limit 5455 * @link: Link to configure sata_spd_limit for 5456 * 5457 * Initialize @link->[hw_]sata_spd_limit to the currently 5458 * configured value. 5459 * 5460 * LOCKING: 5461 * Kernel thread context (may sleep). 5462 * 5463 * RETURNS: 5464 * 0 on success, -errno on failure. 5465 */ 5466 int sata_link_init_spd(struct ata_link *link) 5467 { 5468 u8 spd; 5469 int rc; 5470 5471 rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol); 5472 if (rc) 5473 return rc; 5474 5475 spd = (link->saved_scontrol >> 4) & 0xf; 5476 if (spd) 5477 link->hw_sata_spd_limit &= (1 << spd) - 1; 5478 5479 ata_force_link_limits(link); 5480 5481 link->sata_spd_limit = link->hw_sata_spd_limit; 5482 5483 return 0; 5484 } 5485 5486 /** 5487 * ata_port_alloc - allocate and initialize basic ATA port resources 5488 * @host: ATA host this allocated port belongs to 5489 * 5490 * Allocate and initialize basic ATA port resources. 5491 * 5492 * RETURNS: 5493 * Allocate ATA port on success, NULL on failure. 5494 * 5495 * LOCKING: 5496 * Inherited from calling layer (may sleep). 5497 */ 5498 struct ata_port *ata_port_alloc(struct ata_host *host) 5499 { 5500 struct ata_port *ap; 5501 5502 DPRINTK("ENTER\n"); 5503 5504 ap = kzalloc(sizeof(*ap), GFP_KERNEL); 5505 if (!ap) 5506 return NULL; 5507 5508 ap->pflags |= ATA_PFLAG_INITIALIZING; 5509 ap->lock = &host->lock; 5510 ap->flags = ATA_FLAG_DISABLED; 5511 ap->print_id = -1; 5512 ap->ctl = ATA_DEVCTL_OBS; 5513 ap->host = host; 5514 ap->dev = host->dev; 5515 ap->last_ctl = 0xFF; 5516 5517 #if defined(ATA_VERBOSE_DEBUG) 5518 /* turn on all debugging levels */ 5519 ap->msg_enable = 0x00FF; 5520 #elif defined(ATA_DEBUG) 5521 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR; 5522 #else 5523 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN; 5524 #endif 5525 5526 #ifdef CONFIG_ATA_SFF 5527 INIT_DELAYED_WORK(&ap->port_task, ata_pio_task); 5528 #else 5529 INIT_DELAYED_WORK(&ap->port_task, NULL); 5530 #endif 5531 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug); 5532 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan); 5533 INIT_LIST_HEAD(&ap->eh_done_q); 5534 init_waitqueue_head(&ap->eh_wait_q); 5535 init_completion(&ap->park_req_pending); 5536 init_timer_deferrable(&ap->fastdrain_timer); 5537 ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn; 5538 ap->fastdrain_timer.data = (unsigned long)ap; 5539 5540 ap->cbl = ATA_CBL_NONE; 5541 5542 ata_link_init(ap, &ap->link, 0); 5543 5544 #ifdef ATA_IRQ_TRAP 5545 ap->stats.unhandled_irq = 1; 5546 ap->stats.idle_irq = 1; 5547 #endif 5548 return ap; 5549 } 5550 5551 static void ata_host_release(struct device *gendev, void *res) 5552 { 5553 struct ata_host *host = dev_get_drvdata(gendev); 5554 int i; 5555 5556 for (i = 0; i < host->n_ports; i++) { 5557 struct ata_port *ap = host->ports[i]; 5558 5559 if (!ap) 5560 continue; 5561 5562 if (ap->scsi_host) 5563 scsi_host_put(ap->scsi_host); 5564 5565 kfree(ap->pmp_link); 5566 kfree(ap->slave_link); 5567 kfree(ap); 5568 host->ports[i] = NULL; 5569 } 5570 5571 dev_set_drvdata(gendev, NULL); 5572 } 5573 5574 /** 5575 * ata_host_alloc - allocate and init basic ATA host resources 5576 * @dev: generic device this host is associated with 5577 * @max_ports: maximum number of ATA ports associated with this host 5578 * 5579 * Allocate and initialize basic ATA host resources. LLD calls 5580 * this function to allocate a host, initializes it fully and 5581 * attaches it using ata_host_register(). 5582 * 5583 * @max_ports ports are allocated and host->n_ports is 5584 * initialized to @max_ports. The caller is allowed to decrease 5585 * host->n_ports before calling ata_host_register(). The unused 5586 * ports will be automatically freed on registration. 5587 * 5588 * RETURNS: 5589 * Allocate ATA host on success, NULL on failure. 5590 * 5591 * LOCKING: 5592 * Inherited from calling layer (may sleep). 5593 */ 5594 struct ata_host *ata_host_alloc(struct device *dev, int max_ports) 5595 { 5596 struct ata_host *host; 5597 size_t sz; 5598 int i; 5599 5600 DPRINTK("ENTER\n"); 5601 5602 if (!devres_open_group(dev, NULL, GFP_KERNEL)) 5603 return NULL; 5604 5605 /* alloc a container for our list of ATA ports (buses) */ 5606 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *); 5607 /* alloc a container for our list of ATA ports (buses) */ 5608 host = devres_alloc(ata_host_release, sz, GFP_KERNEL); 5609 if (!host) 5610 goto err_out; 5611 5612 devres_add(dev, host); 5613 dev_set_drvdata(dev, host); 5614 5615 spin_lock_init(&host->lock); 5616 host->dev = dev; 5617 host->n_ports = max_ports; 5618 5619 /* allocate ports bound to this host */ 5620 for (i = 0; i < max_ports; i++) { 5621 struct ata_port *ap; 5622 5623 ap = ata_port_alloc(host); 5624 if (!ap) 5625 goto err_out; 5626 5627 ap->port_no = i; 5628 host->ports[i] = ap; 5629 } 5630 5631 devres_remove_group(dev, NULL); 5632 return host; 5633 5634 err_out: 5635 devres_release_group(dev, NULL); 5636 return NULL; 5637 } 5638 5639 /** 5640 * ata_host_alloc_pinfo - alloc host and init with port_info array 5641 * @dev: generic device this host is associated with 5642 * @ppi: array of ATA port_info to initialize host with 5643 * @n_ports: number of ATA ports attached to this host 5644 * 5645 * Allocate ATA host and initialize with info from @ppi. If NULL 5646 * terminated, @ppi may contain fewer entries than @n_ports. The 5647 * last entry will be used for the remaining ports. 5648 * 5649 * RETURNS: 5650 * Allocate ATA host on success, NULL on failure. 5651 * 5652 * LOCKING: 5653 * Inherited from calling layer (may sleep). 5654 */ 5655 struct ata_host *ata_host_alloc_pinfo(struct device *dev, 5656 const struct ata_port_info * const * ppi, 5657 int n_ports) 5658 { 5659 const struct ata_port_info *pi; 5660 struct ata_host *host; 5661 int i, j; 5662 5663 host = ata_host_alloc(dev, n_ports); 5664 if (!host) 5665 return NULL; 5666 5667 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) { 5668 struct ata_port *ap = host->ports[i]; 5669 5670 if (ppi[j]) 5671 pi = ppi[j++]; 5672 5673 ap->pio_mask = pi->pio_mask; 5674 ap->mwdma_mask = pi->mwdma_mask; 5675 ap->udma_mask = pi->udma_mask; 5676 ap->flags |= pi->flags; 5677 ap->link.flags |= pi->link_flags; 5678 ap->ops = pi->port_ops; 5679 5680 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops)) 5681 host->ops = pi->port_ops; 5682 } 5683 5684 return host; 5685 } 5686 5687 /** 5688 * ata_slave_link_init - initialize slave link 5689 * @ap: port to initialize slave link for 5690 * 5691 * Create and initialize slave link for @ap. This enables slave 5692 * link handling on the port. 5693 * 5694 * In libata, a port contains links and a link contains devices. 5695 * There is single host link but if a PMP is attached to it, 5696 * there can be multiple fan-out links. On SATA, there's usually 5697 * a single device connected to a link but PATA and SATA 5698 * controllers emulating TF based interface can have two - master 5699 * and slave. 5700 * 5701 * However, there are a few controllers which don't fit into this 5702 * abstraction too well - SATA controllers which emulate TF 5703 * interface with both master and slave devices but also have 5704 * separate SCR register sets for each device. These controllers 5705 * need separate links for physical link handling 5706 * (e.g. onlineness, link speed) but should be treated like a 5707 * traditional M/S controller for everything else (e.g. command 5708 * issue, softreset). 5709 * 5710 * slave_link is libata's way of handling this class of 5711 * controllers without impacting core layer too much. For 5712 * anything other than physical link handling, the default host 5713 * link is used for both master and slave. For physical link 5714 * handling, separate @ap->slave_link is used. All dirty details 5715 * are implemented inside libata core layer. From LLD's POV, the 5716 * only difference is that prereset, hardreset and postreset are 5717 * called once more for the slave link, so the reset sequence 5718 * looks like the following. 5719 * 5720 * prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) -> 5721 * softreset(M) -> postreset(M) -> postreset(S) 5722 * 5723 * Note that softreset is called only for the master. Softreset 5724 * resets both M/S by definition, so SRST on master should handle 5725 * both (the standard method will work just fine). 5726 * 5727 * LOCKING: 5728 * Should be called before host is registered. 5729 * 5730 * RETURNS: 5731 * 0 on success, -errno on failure. 5732 */ 5733 int ata_slave_link_init(struct ata_port *ap) 5734 { 5735 struct ata_link *link; 5736 5737 WARN_ON(ap->slave_link); 5738 WARN_ON(ap->flags & ATA_FLAG_PMP); 5739 5740 link = kzalloc(sizeof(*link), GFP_KERNEL); 5741 if (!link) 5742 return -ENOMEM; 5743 5744 ata_link_init(ap, link, 1); 5745 ap->slave_link = link; 5746 return 0; 5747 } 5748 5749 static void ata_host_stop(struct device *gendev, void *res) 5750 { 5751 struct ata_host *host = dev_get_drvdata(gendev); 5752 int i; 5753 5754 WARN_ON(!(host->flags & ATA_HOST_STARTED)); 5755 5756 for (i = 0; i < host->n_ports; i++) { 5757 struct ata_port *ap = host->ports[i]; 5758 5759 if (ap->ops->port_stop) 5760 ap->ops->port_stop(ap); 5761 } 5762 5763 if (host->ops->host_stop) 5764 host->ops->host_stop(host); 5765 } 5766 5767 /** 5768 * ata_finalize_port_ops - finalize ata_port_operations 5769 * @ops: ata_port_operations to finalize 5770 * 5771 * An ata_port_operations can inherit from another ops and that 5772 * ops can again inherit from another. This can go on as many 5773 * times as necessary as long as there is no loop in the 5774 * inheritance chain. 5775 * 5776 * Ops tables are finalized when the host is started. NULL or 5777 * unspecified entries are inherited from the closet ancestor 5778 * which has the method and the entry is populated with it. 5779 * After finalization, the ops table directly points to all the 5780 * methods and ->inherits is no longer necessary and cleared. 5781 * 5782 * Using ATA_OP_NULL, inheriting ops can force a method to NULL. 5783 * 5784 * LOCKING: 5785 * None. 5786 */ 5787 static void ata_finalize_port_ops(struct ata_port_operations *ops) 5788 { 5789 static DEFINE_SPINLOCK(lock); 5790 const struct ata_port_operations *cur; 5791 void **begin = (void **)ops; 5792 void **end = (void **)&ops->inherits; 5793 void **pp; 5794 5795 if (!ops || !ops->inherits) 5796 return; 5797 5798 spin_lock(&lock); 5799 5800 for (cur = ops->inherits; cur; cur = cur->inherits) { 5801 void **inherit = (void **)cur; 5802 5803 for (pp = begin; pp < end; pp++, inherit++) 5804 if (!*pp) 5805 *pp = *inherit; 5806 } 5807 5808 for (pp = begin; pp < end; pp++) 5809 if (IS_ERR(*pp)) 5810 *pp = NULL; 5811 5812 ops->inherits = NULL; 5813 5814 spin_unlock(&lock); 5815 } 5816 5817 /** 5818 * ata_host_start - start and freeze ports of an ATA host 5819 * @host: ATA host to start ports for 5820 * 5821 * Start and then freeze ports of @host. Started status is 5822 * recorded in host->flags, so this function can be called 5823 * multiple times. Ports are guaranteed to get started only 5824 * once. If host->ops isn't initialized yet, its set to the 5825 * first non-dummy port ops. 5826 * 5827 * LOCKING: 5828 * Inherited from calling layer (may sleep). 5829 * 5830 * RETURNS: 5831 * 0 if all ports are started successfully, -errno otherwise. 5832 */ 5833 int ata_host_start(struct ata_host *host) 5834 { 5835 int have_stop = 0; 5836 void *start_dr = NULL; 5837 int i, rc; 5838 5839 if (host->flags & ATA_HOST_STARTED) 5840 return 0; 5841 5842 ata_finalize_port_ops(host->ops); 5843 5844 for (i = 0; i < host->n_ports; i++) { 5845 struct ata_port *ap = host->ports[i]; 5846 5847 ata_finalize_port_ops(ap->ops); 5848 5849 if (!host->ops && !ata_port_is_dummy(ap)) 5850 host->ops = ap->ops; 5851 5852 if (ap->ops->port_stop) 5853 have_stop = 1; 5854 } 5855 5856 if (host->ops->host_stop) 5857 have_stop = 1; 5858 5859 if (have_stop) { 5860 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL); 5861 if (!start_dr) 5862 return -ENOMEM; 5863 } 5864 5865 for (i = 0; i < host->n_ports; i++) { 5866 struct ata_port *ap = host->ports[i]; 5867 5868 if (ap->ops->port_start) { 5869 rc = ap->ops->port_start(ap); 5870 if (rc) { 5871 if (rc != -ENODEV) 5872 dev_printk(KERN_ERR, host->dev, 5873 "failed to start port %d " 5874 "(errno=%d)\n", i, rc); 5875 goto err_out; 5876 } 5877 } 5878 ata_eh_freeze_port(ap); 5879 } 5880 5881 if (start_dr) 5882 devres_add(host->dev, start_dr); 5883 host->flags |= ATA_HOST_STARTED; 5884 return 0; 5885 5886 err_out: 5887 while (--i >= 0) { 5888 struct ata_port *ap = host->ports[i]; 5889 5890 if (ap->ops->port_stop) 5891 ap->ops->port_stop(ap); 5892 } 5893 devres_free(start_dr); 5894 return rc; 5895 } 5896 5897 /** 5898 * ata_sas_host_init - Initialize a host struct 5899 * @host: host to initialize 5900 * @dev: device host is attached to 5901 * @flags: host flags 5902 * @ops: port_ops 5903 * 5904 * LOCKING: 5905 * PCI/etc. bus probe sem. 5906 * 5907 */ 5908 /* KILLME - the only user left is ipr */ 5909 void ata_host_init(struct ata_host *host, struct device *dev, 5910 unsigned long flags, struct ata_port_operations *ops) 5911 { 5912 spin_lock_init(&host->lock); 5913 host->dev = dev; 5914 host->flags = flags; 5915 host->ops = ops; 5916 } 5917 5918 5919 static void async_port_probe(void *data, async_cookie_t cookie) 5920 { 5921 int rc; 5922 struct ata_port *ap = data; 5923 5924 /* 5925 * If we're not allowed to scan this host in parallel, 5926 * we need to wait until all previous scans have completed 5927 * before going further. 5928 * Jeff Garzik says this is only within a controller, so we 5929 * don't need to wait for port 0, only for later ports. 5930 */ 5931 if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0) 5932 async_synchronize_cookie(cookie); 5933 5934 /* probe */ 5935 if (ap->ops->error_handler) { 5936 struct ata_eh_info *ehi = &ap->link.eh_info; 5937 unsigned long flags; 5938 5939 ata_port_probe(ap); 5940 5941 /* kick EH for boot probing */ 5942 spin_lock_irqsave(ap->lock, flags); 5943 5944 ehi->probe_mask |= ATA_ALL_DEVICES; 5945 ehi->action |= ATA_EH_RESET | ATA_EH_LPM; 5946 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET; 5947 5948 ap->pflags &= ~ATA_PFLAG_INITIALIZING; 5949 ap->pflags |= ATA_PFLAG_LOADING; 5950 ata_port_schedule_eh(ap); 5951 5952 spin_unlock_irqrestore(ap->lock, flags); 5953 5954 /* wait for EH to finish */ 5955 ata_port_wait_eh(ap); 5956 } else { 5957 DPRINTK("ata%u: bus probe begin\n", ap->print_id); 5958 rc = ata_bus_probe(ap); 5959 DPRINTK("ata%u: bus probe end\n", ap->print_id); 5960 5961 if (rc) { 5962 /* FIXME: do something useful here? 5963 * Current libata behavior will 5964 * tear down everything when 5965 * the module is removed 5966 * or the h/w is unplugged. 5967 */ 5968 } 5969 } 5970 5971 /* in order to keep device order, we need to synchronize at this point */ 5972 async_synchronize_cookie(cookie); 5973 5974 ata_scsi_scan_host(ap, 1); 5975 5976 } 5977 /** 5978 * ata_host_register - register initialized ATA host 5979 * @host: ATA host to register 5980 * @sht: template for SCSI host 5981 * 5982 * Register initialized ATA host. @host is allocated using 5983 * ata_host_alloc() and fully initialized by LLD. This function 5984 * starts ports, registers @host with ATA and SCSI layers and 5985 * probe registered devices. 5986 * 5987 * LOCKING: 5988 * Inherited from calling layer (may sleep). 5989 * 5990 * RETURNS: 5991 * 0 on success, -errno otherwise. 5992 */ 5993 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht) 5994 { 5995 int i, rc; 5996 5997 /* host must have been started */ 5998 if (!(host->flags & ATA_HOST_STARTED)) { 5999 dev_printk(KERN_ERR, host->dev, 6000 "BUG: trying to register unstarted host\n"); 6001 WARN_ON(1); 6002 return -EINVAL; 6003 } 6004 6005 /* Blow away unused ports. This happens when LLD can't 6006 * determine the exact number of ports to allocate at 6007 * allocation time. 6008 */ 6009 for (i = host->n_ports; host->ports[i]; i++) 6010 kfree(host->ports[i]); 6011 6012 /* give ports names and add SCSI hosts */ 6013 for (i = 0; i < host->n_ports; i++) 6014 host->ports[i]->print_id = ata_print_id++; 6015 6016 rc = ata_scsi_add_hosts(host, sht); 6017 if (rc) 6018 return rc; 6019 6020 /* associate with ACPI nodes */ 6021 ata_acpi_associate(host); 6022 6023 /* set cable, sata_spd_limit and report */ 6024 for (i = 0; i < host->n_ports; i++) { 6025 struct ata_port *ap = host->ports[i]; 6026 unsigned long xfer_mask; 6027 6028 /* set SATA cable type if still unset */ 6029 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA)) 6030 ap->cbl = ATA_CBL_SATA; 6031 6032 /* init sata_spd_limit to the current value */ 6033 sata_link_init_spd(&ap->link); 6034 if (ap->slave_link) 6035 sata_link_init_spd(ap->slave_link); 6036 6037 /* print per-port info to dmesg */ 6038 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask, 6039 ap->udma_mask); 6040 6041 if (!ata_port_is_dummy(ap)) { 6042 ata_port_printk(ap, KERN_INFO, 6043 "%cATA max %s %s\n", 6044 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P', 6045 ata_mode_string(xfer_mask), 6046 ap->link.eh_info.desc); 6047 ata_ehi_clear_desc(&ap->link.eh_info); 6048 } else 6049 ata_port_printk(ap, KERN_INFO, "DUMMY\n"); 6050 } 6051 6052 /* perform each probe synchronously */ 6053 DPRINTK("probe begin\n"); 6054 for (i = 0; i < host->n_ports; i++) { 6055 struct ata_port *ap = host->ports[i]; 6056 async_schedule(async_port_probe, ap); 6057 } 6058 DPRINTK("probe end\n"); 6059 6060 return 0; 6061 } 6062 6063 /** 6064 * ata_host_activate - start host, request IRQ and register it 6065 * @host: target ATA host 6066 * @irq: IRQ to request 6067 * @irq_handler: irq_handler used when requesting IRQ 6068 * @irq_flags: irq_flags used when requesting IRQ 6069 * @sht: scsi_host_template to use when registering the host 6070 * 6071 * After allocating an ATA host and initializing it, most libata 6072 * LLDs perform three steps to activate the host - start host, 6073 * request IRQ and register it. This helper takes necessasry 6074 * arguments and performs the three steps in one go. 6075 * 6076 * An invalid IRQ skips the IRQ registration and expects the host to 6077 * have set polling mode on the port. In this case, @irq_handler 6078 * should be NULL. 6079 * 6080 * LOCKING: 6081 * Inherited from calling layer (may sleep). 6082 * 6083 * RETURNS: 6084 * 0 on success, -errno otherwise. 6085 */ 6086 int ata_host_activate(struct ata_host *host, int irq, 6087 irq_handler_t irq_handler, unsigned long irq_flags, 6088 struct scsi_host_template *sht) 6089 { 6090 int i, rc; 6091 6092 rc = ata_host_start(host); 6093 if (rc) 6094 return rc; 6095 6096 /* Special case for polling mode */ 6097 if (!irq) { 6098 WARN_ON(irq_handler); 6099 return ata_host_register(host, sht); 6100 } 6101 6102 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags, 6103 dev_driver_string(host->dev), host); 6104 if (rc) 6105 return rc; 6106 6107 for (i = 0; i < host->n_ports; i++) 6108 ata_port_desc(host->ports[i], "irq %d", irq); 6109 6110 rc = ata_host_register(host, sht); 6111 /* if failed, just free the IRQ and leave ports alone */ 6112 if (rc) 6113 devm_free_irq(host->dev, irq, host); 6114 6115 return rc; 6116 } 6117 6118 /** 6119 * ata_port_detach - Detach ATA port in prepration of device removal 6120 * @ap: ATA port to be detached 6121 * 6122 * Detach all ATA devices and the associated SCSI devices of @ap; 6123 * then, remove the associated SCSI host. @ap is guaranteed to 6124 * be quiescent on return from this function. 6125 * 6126 * LOCKING: 6127 * Kernel thread context (may sleep). 6128 */ 6129 static void ata_port_detach(struct ata_port *ap) 6130 { 6131 unsigned long flags; 6132 6133 if (!ap->ops->error_handler) 6134 goto skip_eh; 6135 6136 /* tell EH we're leaving & flush EH */ 6137 spin_lock_irqsave(ap->lock, flags); 6138 ap->pflags |= ATA_PFLAG_UNLOADING; 6139 ata_port_schedule_eh(ap); 6140 spin_unlock_irqrestore(ap->lock, flags); 6141 6142 /* wait till EH commits suicide */ 6143 ata_port_wait_eh(ap); 6144 6145 /* it better be dead now */ 6146 WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED)); 6147 6148 cancel_rearming_delayed_work(&ap->hotplug_task); 6149 6150 skip_eh: 6151 /* remove the associated SCSI host */ 6152 scsi_remove_host(ap->scsi_host); 6153 } 6154 6155 /** 6156 * ata_host_detach - Detach all ports of an ATA host 6157 * @host: Host to detach 6158 * 6159 * Detach all ports of @host. 6160 * 6161 * LOCKING: 6162 * Kernel thread context (may sleep). 6163 */ 6164 void ata_host_detach(struct ata_host *host) 6165 { 6166 int i; 6167 6168 for (i = 0; i < host->n_ports; i++) 6169 ata_port_detach(host->ports[i]); 6170 6171 /* the host is dead now, dissociate ACPI */ 6172 ata_acpi_dissociate(host); 6173 } 6174 6175 #ifdef CONFIG_PCI 6176 6177 /** 6178 * ata_pci_remove_one - PCI layer callback for device removal 6179 * @pdev: PCI device that was removed 6180 * 6181 * PCI layer indicates to libata via this hook that hot-unplug or 6182 * module unload event has occurred. Detach all ports. Resource 6183 * release is handled via devres. 6184 * 6185 * LOCKING: 6186 * Inherited from PCI layer (may sleep). 6187 */ 6188 void ata_pci_remove_one(struct pci_dev *pdev) 6189 { 6190 struct device *dev = &pdev->dev; 6191 struct ata_host *host = dev_get_drvdata(dev); 6192 6193 ata_host_detach(host); 6194 } 6195 6196 /* move to PCI subsystem */ 6197 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits) 6198 { 6199 unsigned long tmp = 0; 6200 6201 switch (bits->width) { 6202 case 1: { 6203 u8 tmp8 = 0; 6204 pci_read_config_byte(pdev, bits->reg, &tmp8); 6205 tmp = tmp8; 6206 break; 6207 } 6208 case 2: { 6209 u16 tmp16 = 0; 6210 pci_read_config_word(pdev, bits->reg, &tmp16); 6211 tmp = tmp16; 6212 break; 6213 } 6214 case 4: { 6215 u32 tmp32 = 0; 6216 pci_read_config_dword(pdev, bits->reg, &tmp32); 6217 tmp = tmp32; 6218 break; 6219 } 6220 6221 default: 6222 return -EINVAL; 6223 } 6224 6225 tmp &= bits->mask; 6226 6227 return (tmp == bits->val) ? 1 : 0; 6228 } 6229 6230 #ifdef CONFIG_PM 6231 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg) 6232 { 6233 pci_save_state(pdev); 6234 pci_disable_device(pdev); 6235 6236 if (mesg.event & PM_EVENT_SLEEP) 6237 pci_set_power_state(pdev, PCI_D3hot); 6238 } 6239 6240 int ata_pci_device_do_resume(struct pci_dev *pdev) 6241 { 6242 int rc; 6243 6244 pci_set_power_state(pdev, PCI_D0); 6245 pci_restore_state(pdev); 6246 6247 rc = pcim_enable_device(pdev); 6248 if (rc) { 6249 dev_printk(KERN_ERR, &pdev->dev, 6250 "failed to enable device after resume (%d)\n", rc); 6251 return rc; 6252 } 6253 6254 pci_set_master(pdev); 6255 return 0; 6256 } 6257 6258 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg) 6259 { 6260 struct ata_host *host = dev_get_drvdata(&pdev->dev); 6261 int rc = 0; 6262 6263 rc = ata_host_suspend(host, mesg); 6264 if (rc) 6265 return rc; 6266 6267 ata_pci_device_do_suspend(pdev, mesg); 6268 6269 return 0; 6270 } 6271 6272 int ata_pci_device_resume(struct pci_dev *pdev) 6273 { 6274 struct ata_host *host = dev_get_drvdata(&pdev->dev); 6275 int rc; 6276 6277 rc = ata_pci_device_do_resume(pdev); 6278 if (rc == 0) 6279 ata_host_resume(host); 6280 return rc; 6281 } 6282 #endif /* CONFIG_PM */ 6283 6284 #endif /* CONFIG_PCI */ 6285 6286 static int __init ata_parse_force_one(char **cur, 6287 struct ata_force_ent *force_ent, 6288 const char **reason) 6289 { 6290 /* FIXME: Currently, there's no way to tag init const data and 6291 * using __initdata causes build failure on some versions of 6292 * gcc. Once __initdataconst is implemented, add const to the 6293 * following structure. 6294 */ 6295 static struct ata_force_param force_tbl[] __initdata = { 6296 { "40c", .cbl = ATA_CBL_PATA40 }, 6297 { "80c", .cbl = ATA_CBL_PATA80 }, 6298 { "short40c", .cbl = ATA_CBL_PATA40_SHORT }, 6299 { "unk", .cbl = ATA_CBL_PATA_UNK }, 6300 { "ign", .cbl = ATA_CBL_PATA_IGN }, 6301 { "sata", .cbl = ATA_CBL_SATA }, 6302 { "1.5Gbps", .spd_limit = 1 }, 6303 { "3.0Gbps", .spd_limit = 2 }, 6304 { "noncq", .horkage_on = ATA_HORKAGE_NONCQ }, 6305 { "ncq", .horkage_off = ATA_HORKAGE_NONCQ }, 6306 { "pio0", .xfer_mask = 1 << (ATA_SHIFT_PIO + 0) }, 6307 { "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) }, 6308 { "pio2", .xfer_mask = 1 << (ATA_SHIFT_PIO + 2) }, 6309 { "pio3", .xfer_mask = 1 << (ATA_SHIFT_PIO + 3) }, 6310 { "pio4", .xfer_mask = 1 << (ATA_SHIFT_PIO + 4) }, 6311 { "pio5", .xfer_mask = 1 << (ATA_SHIFT_PIO + 5) }, 6312 { "pio6", .xfer_mask = 1 << (ATA_SHIFT_PIO + 6) }, 6313 { "mwdma0", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 0) }, 6314 { "mwdma1", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 1) }, 6315 { "mwdma2", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 2) }, 6316 { "mwdma3", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 3) }, 6317 { "mwdma4", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 4) }, 6318 { "udma0", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) }, 6319 { "udma16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) }, 6320 { "udma/16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) }, 6321 { "udma1", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) }, 6322 { "udma25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) }, 6323 { "udma/25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) }, 6324 { "udma2", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) }, 6325 { "udma33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) }, 6326 { "udma/33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) }, 6327 { "udma3", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) }, 6328 { "udma44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) }, 6329 { "udma/44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) }, 6330 { "udma4", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) }, 6331 { "udma66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) }, 6332 { "udma/66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) }, 6333 { "udma5", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) }, 6334 { "udma100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) }, 6335 { "udma/100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) }, 6336 { "udma6", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) }, 6337 { "udma133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) }, 6338 { "udma/133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) }, 6339 { "udma7", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 7) }, 6340 { "nohrst", .lflags = ATA_LFLAG_NO_HRST }, 6341 { "nosrst", .lflags = ATA_LFLAG_NO_SRST }, 6342 { "norst", .lflags = ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST }, 6343 }; 6344 char *start = *cur, *p = *cur; 6345 char *id, *val, *endp; 6346 const struct ata_force_param *match_fp = NULL; 6347 int nr_matches = 0, i; 6348 6349 /* find where this param ends and update *cur */ 6350 while (*p != '\0' && *p != ',') 6351 p++; 6352 6353 if (*p == '\0') 6354 *cur = p; 6355 else 6356 *cur = p + 1; 6357 6358 *p = '\0'; 6359 6360 /* parse */ 6361 p = strchr(start, ':'); 6362 if (!p) { 6363 val = strstrip(start); 6364 goto parse_val; 6365 } 6366 *p = '\0'; 6367 6368 id = strstrip(start); 6369 val = strstrip(p + 1); 6370 6371 /* parse id */ 6372 p = strchr(id, '.'); 6373 if (p) { 6374 *p++ = '\0'; 6375 force_ent->device = simple_strtoul(p, &endp, 10); 6376 if (p == endp || *endp != '\0') { 6377 *reason = "invalid device"; 6378 return -EINVAL; 6379 } 6380 } 6381 6382 force_ent->port = simple_strtoul(id, &endp, 10); 6383 if (p == endp || *endp != '\0') { 6384 *reason = "invalid port/link"; 6385 return -EINVAL; 6386 } 6387 6388 parse_val: 6389 /* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */ 6390 for (i = 0; i < ARRAY_SIZE(force_tbl); i++) { 6391 const struct ata_force_param *fp = &force_tbl[i]; 6392 6393 if (strncasecmp(val, fp->name, strlen(val))) 6394 continue; 6395 6396 nr_matches++; 6397 match_fp = fp; 6398 6399 if (strcasecmp(val, fp->name) == 0) { 6400 nr_matches = 1; 6401 break; 6402 } 6403 } 6404 6405 if (!nr_matches) { 6406 *reason = "unknown value"; 6407 return -EINVAL; 6408 } 6409 if (nr_matches > 1) { 6410 *reason = "ambigious value"; 6411 return -EINVAL; 6412 } 6413 6414 force_ent->param = *match_fp; 6415 6416 return 0; 6417 } 6418 6419 static void __init ata_parse_force_param(void) 6420 { 6421 int idx = 0, size = 1; 6422 int last_port = -1, last_device = -1; 6423 char *p, *cur, *next; 6424 6425 /* calculate maximum number of params and allocate force_tbl */ 6426 for (p = ata_force_param_buf; *p; p++) 6427 if (*p == ',') 6428 size++; 6429 6430 ata_force_tbl = kzalloc(sizeof(ata_force_tbl[0]) * size, GFP_KERNEL); 6431 if (!ata_force_tbl) { 6432 printk(KERN_WARNING "ata: failed to extend force table, " 6433 "libata.force ignored\n"); 6434 return; 6435 } 6436 6437 /* parse and populate the table */ 6438 for (cur = ata_force_param_buf; *cur != '\0'; cur = next) { 6439 const char *reason = ""; 6440 struct ata_force_ent te = { .port = -1, .device = -1 }; 6441 6442 next = cur; 6443 if (ata_parse_force_one(&next, &te, &reason)) { 6444 printk(KERN_WARNING "ata: failed to parse force " 6445 "parameter \"%s\" (%s)\n", 6446 cur, reason); 6447 continue; 6448 } 6449 6450 if (te.port == -1) { 6451 te.port = last_port; 6452 te.device = last_device; 6453 } 6454 6455 ata_force_tbl[idx++] = te; 6456 6457 last_port = te.port; 6458 last_device = te.device; 6459 } 6460 6461 ata_force_tbl_size = idx; 6462 } 6463 6464 static int __init ata_init(void) 6465 { 6466 ata_parse_force_param(); 6467 6468 ata_wq = create_workqueue("ata"); 6469 if (!ata_wq) 6470 goto free_force_tbl; 6471 6472 ata_aux_wq = create_singlethread_workqueue("ata_aux"); 6473 if (!ata_aux_wq) 6474 goto free_wq; 6475 6476 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n"); 6477 return 0; 6478 6479 free_wq: 6480 destroy_workqueue(ata_wq); 6481 free_force_tbl: 6482 kfree(ata_force_tbl); 6483 return -ENOMEM; 6484 } 6485 6486 static void __exit ata_exit(void) 6487 { 6488 kfree(ata_force_tbl); 6489 destroy_workqueue(ata_wq); 6490 destroy_workqueue(ata_aux_wq); 6491 } 6492 6493 subsys_initcall(ata_init); 6494 module_exit(ata_exit); 6495 6496 static unsigned long ratelimit_time; 6497 static DEFINE_SPINLOCK(ata_ratelimit_lock); 6498 6499 int ata_ratelimit(void) 6500 { 6501 int rc; 6502 unsigned long flags; 6503 6504 spin_lock_irqsave(&ata_ratelimit_lock, flags); 6505 6506 if (time_after(jiffies, ratelimit_time)) { 6507 rc = 1; 6508 ratelimit_time = jiffies + (HZ/5); 6509 } else 6510 rc = 0; 6511 6512 spin_unlock_irqrestore(&ata_ratelimit_lock, flags); 6513 6514 return rc; 6515 } 6516 6517 /** 6518 * ata_wait_register - wait until register value changes 6519 * @reg: IO-mapped register 6520 * @mask: Mask to apply to read register value 6521 * @val: Wait condition 6522 * @interval: polling interval in milliseconds 6523 * @timeout: timeout in milliseconds 6524 * 6525 * Waiting for some bits of register to change is a common 6526 * operation for ATA controllers. This function reads 32bit LE 6527 * IO-mapped register @reg and tests for the following condition. 6528 * 6529 * (*@reg & mask) != val 6530 * 6531 * If the condition is met, it returns; otherwise, the process is 6532 * repeated after @interval_msec until timeout. 6533 * 6534 * LOCKING: 6535 * Kernel thread context (may sleep) 6536 * 6537 * RETURNS: 6538 * The final register value. 6539 */ 6540 u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val, 6541 unsigned long interval, unsigned long timeout) 6542 { 6543 unsigned long deadline; 6544 u32 tmp; 6545 6546 tmp = ioread32(reg); 6547 6548 /* Calculate timeout _after_ the first read to make sure 6549 * preceding writes reach the controller before starting to 6550 * eat away the timeout. 6551 */ 6552 deadline = ata_deadline(jiffies, timeout); 6553 6554 while ((tmp & mask) == val && time_before(jiffies, deadline)) { 6555 msleep(interval); 6556 tmp = ioread32(reg); 6557 } 6558 6559 return tmp; 6560 } 6561 6562 /* 6563 * Dummy port_ops 6564 */ 6565 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc) 6566 { 6567 return AC_ERR_SYSTEM; 6568 } 6569 6570 static void ata_dummy_error_handler(struct ata_port *ap) 6571 { 6572 /* truly dummy */ 6573 } 6574 6575 struct ata_port_operations ata_dummy_port_ops = { 6576 .qc_prep = ata_noop_qc_prep, 6577 .qc_issue = ata_dummy_qc_issue, 6578 .error_handler = ata_dummy_error_handler, 6579 }; 6580 6581 const struct ata_port_info ata_dummy_port_info = { 6582 .port_ops = &ata_dummy_port_ops, 6583 }; 6584 6585 /* 6586 * libata is essentially a library of internal helper functions for 6587 * low-level ATA host controller drivers. As such, the API/ABI is 6588 * likely to change as new drivers are added and updated. 6589 * Do not depend on ABI/API stability. 6590 */ 6591 EXPORT_SYMBOL_GPL(sata_deb_timing_normal); 6592 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug); 6593 EXPORT_SYMBOL_GPL(sata_deb_timing_long); 6594 EXPORT_SYMBOL_GPL(ata_base_port_ops); 6595 EXPORT_SYMBOL_GPL(sata_port_ops); 6596 EXPORT_SYMBOL_GPL(ata_dummy_port_ops); 6597 EXPORT_SYMBOL_GPL(ata_dummy_port_info); 6598 EXPORT_SYMBOL_GPL(ata_link_next); 6599 EXPORT_SYMBOL_GPL(ata_dev_next); 6600 EXPORT_SYMBOL_GPL(ata_std_bios_param); 6601 EXPORT_SYMBOL_GPL(ata_host_init); 6602 EXPORT_SYMBOL_GPL(ata_host_alloc); 6603 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo); 6604 EXPORT_SYMBOL_GPL(ata_slave_link_init); 6605 EXPORT_SYMBOL_GPL(ata_host_start); 6606 EXPORT_SYMBOL_GPL(ata_host_register); 6607 EXPORT_SYMBOL_GPL(ata_host_activate); 6608 EXPORT_SYMBOL_GPL(ata_host_detach); 6609 EXPORT_SYMBOL_GPL(ata_sg_init); 6610 EXPORT_SYMBOL_GPL(ata_qc_complete); 6611 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple); 6612 EXPORT_SYMBOL_GPL(atapi_cmd_type); 6613 EXPORT_SYMBOL_GPL(ata_tf_to_fis); 6614 EXPORT_SYMBOL_GPL(ata_tf_from_fis); 6615 EXPORT_SYMBOL_GPL(ata_pack_xfermask); 6616 EXPORT_SYMBOL_GPL(ata_unpack_xfermask); 6617 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode); 6618 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask); 6619 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift); 6620 EXPORT_SYMBOL_GPL(ata_mode_string); 6621 EXPORT_SYMBOL_GPL(ata_id_xfermask); 6622 EXPORT_SYMBOL_GPL(ata_port_start); 6623 EXPORT_SYMBOL_GPL(ata_do_set_mode); 6624 EXPORT_SYMBOL_GPL(ata_std_qc_defer); 6625 EXPORT_SYMBOL_GPL(ata_noop_qc_prep); 6626 EXPORT_SYMBOL_GPL(ata_port_probe); 6627 EXPORT_SYMBOL_GPL(ata_dev_disable); 6628 EXPORT_SYMBOL_GPL(sata_set_spd); 6629 EXPORT_SYMBOL_GPL(ata_wait_after_reset); 6630 EXPORT_SYMBOL_GPL(sata_link_debounce); 6631 EXPORT_SYMBOL_GPL(sata_link_resume); 6632 EXPORT_SYMBOL_GPL(ata_std_prereset); 6633 EXPORT_SYMBOL_GPL(sata_link_hardreset); 6634 EXPORT_SYMBOL_GPL(sata_std_hardreset); 6635 EXPORT_SYMBOL_GPL(ata_std_postreset); 6636 EXPORT_SYMBOL_GPL(ata_dev_classify); 6637 EXPORT_SYMBOL_GPL(ata_dev_pair); 6638 EXPORT_SYMBOL_GPL(ata_port_disable); 6639 EXPORT_SYMBOL_GPL(ata_ratelimit); 6640 EXPORT_SYMBOL_GPL(ata_wait_register); 6641 EXPORT_SYMBOL_GPL(ata_scsi_ioctl); 6642 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd); 6643 EXPORT_SYMBOL_GPL(ata_scsi_slave_config); 6644 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy); 6645 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth); 6646 EXPORT_SYMBOL_GPL(sata_scr_valid); 6647 EXPORT_SYMBOL_GPL(sata_scr_read); 6648 EXPORT_SYMBOL_GPL(sata_scr_write); 6649 EXPORT_SYMBOL_GPL(sata_scr_write_flush); 6650 EXPORT_SYMBOL_GPL(ata_link_online); 6651 EXPORT_SYMBOL_GPL(ata_link_offline); 6652 #ifdef CONFIG_PM 6653 EXPORT_SYMBOL_GPL(ata_host_suspend); 6654 EXPORT_SYMBOL_GPL(ata_host_resume); 6655 #endif /* CONFIG_PM */ 6656 EXPORT_SYMBOL_GPL(ata_id_string); 6657 EXPORT_SYMBOL_GPL(ata_id_c_string); 6658 EXPORT_SYMBOL_GPL(ata_do_dev_read_id); 6659 EXPORT_SYMBOL_GPL(ata_scsi_simulate); 6660 6661 EXPORT_SYMBOL_GPL(ata_pio_need_iordy); 6662 EXPORT_SYMBOL_GPL(ata_timing_find_mode); 6663 EXPORT_SYMBOL_GPL(ata_timing_compute); 6664 EXPORT_SYMBOL_GPL(ata_timing_merge); 6665 EXPORT_SYMBOL_GPL(ata_timing_cycle2mode); 6666 6667 #ifdef CONFIG_PCI 6668 EXPORT_SYMBOL_GPL(pci_test_config_bits); 6669 EXPORT_SYMBOL_GPL(ata_pci_remove_one); 6670 #ifdef CONFIG_PM 6671 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend); 6672 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume); 6673 EXPORT_SYMBOL_GPL(ata_pci_device_suspend); 6674 EXPORT_SYMBOL_GPL(ata_pci_device_resume); 6675 #endif /* CONFIG_PM */ 6676 #endif /* CONFIG_PCI */ 6677 6678 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc); 6679 EXPORT_SYMBOL_GPL(ata_ehi_push_desc); 6680 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc); 6681 EXPORT_SYMBOL_GPL(ata_port_desc); 6682 #ifdef CONFIG_PCI 6683 EXPORT_SYMBOL_GPL(ata_port_pbar_desc); 6684 #endif /* CONFIG_PCI */ 6685 EXPORT_SYMBOL_GPL(ata_port_schedule_eh); 6686 EXPORT_SYMBOL_GPL(ata_link_abort); 6687 EXPORT_SYMBOL_GPL(ata_port_abort); 6688 EXPORT_SYMBOL_GPL(ata_port_freeze); 6689 EXPORT_SYMBOL_GPL(sata_async_notification); 6690 EXPORT_SYMBOL_GPL(ata_eh_freeze_port); 6691 EXPORT_SYMBOL_GPL(ata_eh_thaw_port); 6692 EXPORT_SYMBOL_GPL(ata_eh_qc_complete); 6693 EXPORT_SYMBOL_GPL(ata_eh_qc_retry); 6694 EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error); 6695 EXPORT_SYMBOL_GPL(ata_do_eh); 6696 EXPORT_SYMBOL_GPL(ata_std_error_handler); 6697 6698 EXPORT_SYMBOL_GPL(ata_cable_40wire); 6699 EXPORT_SYMBOL_GPL(ata_cable_80wire); 6700 EXPORT_SYMBOL_GPL(ata_cable_unknown); 6701 EXPORT_SYMBOL_GPL(ata_cable_ignore); 6702 EXPORT_SYMBOL_GPL(ata_cable_sata); 6703