ide-iops.c revision 1a7809e3499921a016d203b9ee51a77d3cc1dc98
1/* 2 * Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org> 3 * Copyright (C) 2003 Red Hat <alan@redhat.com> 4 * 5 */ 6 7#include <linux/module.h> 8#include <linux/types.h> 9#include <linux/string.h> 10#include <linux/kernel.h> 11#include <linux/timer.h> 12#include <linux/mm.h> 13#include <linux/interrupt.h> 14#include <linux/major.h> 15#include <linux/errno.h> 16#include <linux/genhd.h> 17#include <linux/blkpg.h> 18#include <linux/slab.h> 19#include <linux/pci.h> 20#include <linux/delay.h> 21#include <linux/hdreg.h> 22#include <linux/ide.h> 23#include <linux/bitops.h> 24#include <linux/nmi.h> 25 26#include <asm/byteorder.h> 27#include <asm/irq.h> 28#include <asm/uaccess.h> 29#include <asm/io.h> 30 31/* 32 * Conventional PIO operations for ATA devices 33 */ 34 35static u8 ide_inb (unsigned long port) 36{ 37 return (u8) inb(port); 38} 39 40static void ide_outb (u8 val, unsigned long port) 41{ 42 outb(val, port); 43} 44 45/* 46 * MMIO operations, typically used for SATA controllers 47 */ 48 49static u8 ide_mm_inb (unsigned long port) 50{ 51 return (u8) readb((void __iomem *) port); 52} 53 54static void ide_mm_outb (u8 value, unsigned long port) 55{ 56 writeb(value, (void __iomem *) port); 57} 58 59void SELECT_DRIVE (ide_drive_t *drive) 60{ 61 ide_hwif_t *hwif = drive->hwif; 62 const struct ide_port_ops *port_ops = hwif->port_ops; 63 ide_task_t task; 64 65 if (port_ops && port_ops->selectproc) 66 port_ops->selectproc(drive); 67 68 memset(&task, 0, sizeof(task)); 69 task.tf_flags = IDE_TFLAG_OUT_DEVICE; 70 71 drive->hwif->tp_ops->tf_load(drive, &task); 72} 73 74void SELECT_MASK(ide_drive_t *drive, int mask) 75{ 76 const struct ide_port_ops *port_ops = drive->hwif->port_ops; 77 78 if (port_ops && port_ops->maskproc) 79 port_ops->maskproc(drive, mask); 80} 81 82void ide_exec_command(ide_hwif_t *hwif, u8 cmd) 83{ 84 if (hwif->host_flags & IDE_HFLAG_MMIO) 85 writeb(cmd, (void __iomem *)hwif->io_ports.command_addr); 86 else 87 outb(cmd, hwif->io_ports.command_addr); 88} 89EXPORT_SYMBOL_GPL(ide_exec_command); 90 91u8 ide_read_status(ide_hwif_t *hwif) 92{ 93 if (hwif->host_flags & IDE_HFLAG_MMIO) 94 return readb((void __iomem *)hwif->io_ports.status_addr); 95 else 96 return inb(hwif->io_ports.status_addr); 97} 98EXPORT_SYMBOL_GPL(ide_read_status); 99 100u8 ide_read_altstatus(ide_hwif_t *hwif) 101{ 102 if (hwif->host_flags & IDE_HFLAG_MMIO) 103 return readb((void __iomem *)hwif->io_ports.ctl_addr); 104 else 105 return inb(hwif->io_ports.ctl_addr); 106} 107EXPORT_SYMBOL_GPL(ide_read_altstatus); 108 109u8 ide_read_sff_dma_status(ide_hwif_t *hwif) 110{ 111 if (hwif->host_flags & IDE_HFLAG_MMIO) 112 return readb((void __iomem *)(hwif->dma_base + ATA_DMA_STATUS)); 113 else 114 return inb(hwif->dma_base + ATA_DMA_STATUS); 115} 116EXPORT_SYMBOL_GPL(ide_read_sff_dma_status); 117 118void ide_set_irq(ide_hwif_t *hwif, int on) 119{ 120 u8 ctl = ATA_DEVCTL_OBS; 121 122 if (on == 4) { /* hack for SRST */ 123 ctl |= 4; 124 on &= ~4; 125 } 126 127 ctl |= on ? 0 : 2; 128 129 if (hwif->host_flags & IDE_HFLAG_MMIO) 130 writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr); 131 else 132 outb(ctl, hwif->io_ports.ctl_addr); 133} 134EXPORT_SYMBOL_GPL(ide_set_irq); 135 136void ide_tf_load(ide_drive_t *drive, ide_task_t *task) 137{ 138 ide_hwif_t *hwif = drive->hwif; 139 struct ide_io_ports *io_ports = &hwif->io_ports; 140 struct ide_taskfile *tf = &task->tf; 141 void (*tf_outb)(u8 addr, unsigned long port); 142 u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0; 143 u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF; 144 145 if (mmio) 146 tf_outb = ide_mm_outb; 147 else 148 tf_outb = ide_outb; 149 150 if (task->tf_flags & IDE_TFLAG_FLAGGED) 151 HIHI = 0xFF; 152 153 if (task->tf_flags & IDE_TFLAG_OUT_DATA) { 154 u16 data = (tf->hob_data << 8) | tf->data; 155 156 if (mmio) 157 writew(data, (void __iomem *)io_ports->data_addr); 158 else 159 outw(data, io_ports->data_addr); 160 } 161 162 if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE) 163 tf_outb(tf->hob_feature, io_ports->feature_addr); 164 if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT) 165 tf_outb(tf->hob_nsect, io_ports->nsect_addr); 166 if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL) 167 tf_outb(tf->hob_lbal, io_ports->lbal_addr); 168 if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM) 169 tf_outb(tf->hob_lbam, io_ports->lbam_addr); 170 if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH) 171 tf_outb(tf->hob_lbah, io_ports->lbah_addr); 172 173 if (task->tf_flags & IDE_TFLAG_OUT_FEATURE) 174 tf_outb(tf->feature, io_ports->feature_addr); 175 if (task->tf_flags & IDE_TFLAG_OUT_NSECT) 176 tf_outb(tf->nsect, io_ports->nsect_addr); 177 if (task->tf_flags & IDE_TFLAG_OUT_LBAL) 178 tf_outb(tf->lbal, io_ports->lbal_addr); 179 if (task->tf_flags & IDE_TFLAG_OUT_LBAM) 180 tf_outb(tf->lbam, io_ports->lbam_addr); 181 if (task->tf_flags & IDE_TFLAG_OUT_LBAH) 182 tf_outb(tf->lbah, io_ports->lbah_addr); 183 184 if (task->tf_flags & IDE_TFLAG_OUT_DEVICE) 185 tf_outb((tf->device & HIHI) | drive->select.all, 186 io_ports->device_addr); 187} 188EXPORT_SYMBOL_GPL(ide_tf_load); 189 190void ide_tf_read(ide_drive_t *drive, ide_task_t *task) 191{ 192 ide_hwif_t *hwif = drive->hwif; 193 struct ide_io_ports *io_ports = &hwif->io_ports; 194 struct ide_taskfile *tf = &task->tf; 195 void (*tf_outb)(u8 addr, unsigned long port); 196 u8 (*tf_inb)(unsigned long port); 197 u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0; 198 199 if (mmio) { 200 tf_outb = ide_mm_outb; 201 tf_inb = ide_mm_inb; 202 } else { 203 tf_outb = ide_outb; 204 tf_inb = ide_inb; 205 } 206 207 if (task->tf_flags & IDE_TFLAG_IN_DATA) { 208 u16 data; 209 210 if (mmio) 211 data = readw((void __iomem *)io_ports->data_addr); 212 else 213 data = inw(io_ports->data_addr); 214 215 tf->data = data & 0xff; 216 tf->hob_data = (data >> 8) & 0xff; 217 } 218 219 /* be sure we're looking at the low order bits */ 220 tf_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr); 221 222 if (task->tf_flags & IDE_TFLAG_IN_FEATURE) 223 tf->feature = tf_inb(io_ports->feature_addr); 224 if (task->tf_flags & IDE_TFLAG_IN_NSECT) 225 tf->nsect = tf_inb(io_ports->nsect_addr); 226 if (task->tf_flags & IDE_TFLAG_IN_LBAL) 227 tf->lbal = tf_inb(io_ports->lbal_addr); 228 if (task->tf_flags & IDE_TFLAG_IN_LBAM) 229 tf->lbam = tf_inb(io_ports->lbam_addr); 230 if (task->tf_flags & IDE_TFLAG_IN_LBAH) 231 tf->lbah = tf_inb(io_ports->lbah_addr); 232 if (task->tf_flags & IDE_TFLAG_IN_DEVICE) 233 tf->device = tf_inb(io_ports->device_addr); 234 235 if (task->tf_flags & IDE_TFLAG_LBA48) { 236 tf_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr); 237 238 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE) 239 tf->hob_feature = tf_inb(io_ports->feature_addr); 240 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT) 241 tf->hob_nsect = tf_inb(io_ports->nsect_addr); 242 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL) 243 tf->hob_lbal = tf_inb(io_ports->lbal_addr); 244 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM) 245 tf->hob_lbam = tf_inb(io_ports->lbam_addr); 246 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH) 247 tf->hob_lbah = tf_inb(io_ports->lbah_addr); 248 } 249} 250EXPORT_SYMBOL_GPL(ide_tf_read); 251 252/* 253 * Some localbus EIDE interfaces require a special access sequence 254 * when using 32-bit I/O instructions to transfer data. We call this 255 * the "vlb_sync" sequence, which consists of three successive reads 256 * of the sector count register location, with interrupts disabled 257 * to ensure that the reads all happen together. 258 */ 259static void ata_vlb_sync(unsigned long port) 260{ 261 (void)inb(port); 262 (void)inb(port); 263 (void)inb(port); 264} 265 266/* 267 * This is used for most PIO data transfers *from* the IDE interface 268 * 269 * These routines will round up any request for an odd number of bytes, 270 * so if an odd len is specified, be sure that there's at least one 271 * extra byte allocated for the buffer. 272 */ 273void ide_input_data(ide_drive_t *drive, struct request *rq, void *buf, 274 unsigned int len) 275{ 276 ide_hwif_t *hwif = drive->hwif; 277 struct ide_io_ports *io_ports = &hwif->io_ports; 278 unsigned long data_addr = io_ports->data_addr; 279 u8 io_32bit = drive->io_32bit; 280 u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0; 281 282 len++; 283 284 if (io_32bit) { 285 unsigned long uninitialized_var(flags); 286 287 if ((io_32bit & 2) && !mmio) { 288 local_irq_save(flags); 289 ata_vlb_sync(io_ports->nsect_addr); 290 } 291 292 if (mmio) 293 __ide_mm_insl((void __iomem *)data_addr, buf, len / 4); 294 else 295 insl(data_addr, buf, len / 4); 296 297 if ((io_32bit & 2) && !mmio) 298 local_irq_restore(flags); 299 300 if ((len & 3) >= 2) { 301 if (mmio) 302 __ide_mm_insw((void __iomem *)data_addr, 303 (u8 *)buf + (len & ~3), 1); 304 else 305 insw(data_addr, (u8 *)buf + (len & ~3), 1); 306 } 307 } else { 308 if (mmio) 309 __ide_mm_insw((void __iomem *)data_addr, buf, len / 2); 310 else 311 insw(data_addr, buf, len / 2); 312 } 313} 314EXPORT_SYMBOL_GPL(ide_input_data); 315 316/* 317 * This is used for most PIO data transfers *to* the IDE interface 318 */ 319void ide_output_data(ide_drive_t *drive, struct request *rq, void *buf, 320 unsigned int len) 321{ 322 ide_hwif_t *hwif = drive->hwif; 323 struct ide_io_ports *io_ports = &hwif->io_ports; 324 unsigned long data_addr = io_ports->data_addr; 325 u8 io_32bit = drive->io_32bit; 326 u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0; 327 328 if (io_32bit) { 329 unsigned long uninitialized_var(flags); 330 331 if ((io_32bit & 2) && !mmio) { 332 local_irq_save(flags); 333 ata_vlb_sync(io_ports->nsect_addr); 334 } 335 336 if (mmio) 337 __ide_mm_outsl((void __iomem *)data_addr, buf, len / 4); 338 else 339 outsl(data_addr, buf, len / 4); 340 341 if ((io_32bit & 2) && !mmio) 342 local_irq_restore(flags); 343 344 if ((len & 3) >= 2) { 345 if (mmio) 346 __ide_mm_outsw((void __iomem *)data_addr, 347 (u8 *)buf + (len & ~3), 1); 348 else 349 outsw(data_addr, (u8 *)buf + (len & ~3), 1); 350 } 351 } else { 352 if (mmio) 353 __ide_mm_outsw((void __iomem *)data_addr, buf, len / 2); 354 else 355 outsw(data_addr, buf, len / 2); 356 } 357} 358EXPORT_SYMBOL_GPL(ide_output_data); 359 360u8 ide_read_error(ide_drive_t *drive) 361{ 362 ide_task_t task; 363 364 memset(&task, 0, sizeof(task)); 365 task.tf_flags = IDE_TFLAG_IN_FEATURE; 366 367 drive->hwif->tp_ops->tf_read(drive, &task); 368 369 return task.tf.error; 370} 371EXPORT_SYMBOL_GPL(ide_read_error); 372 373void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason) 374{ 375 ide_task_t task; 376 377 memset(&task, 0, sizeof(task)); 378 task.tf_flags = IDE_TFLAG_IN_LBAH | IDE_TFLAG_IN_LBAM | 379 IDE_TFLAG_IN_NSECT; 380 381 drive->hwif->tp_ops->tf_read(drive, &task); 382 383 *bcount = (task.tf.lbah << 8) | task.tf.lbam; 384 *ireason = task.tf.nsect & 3; 385} 386EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason); 387 388const struct ide_tp_ops default_tp_ops = { 389 .exec_command = ide_exec_command, 390 .read_status = ide_read_status, 391 .read_altstatus = ide_read_altstatus, 392 .read_sff_dma_status = ide_read_sff_dma_status, 393 394 .set_irq = ide_set_irq, 395 396 .tf_load = ide_tf_load, 397 .tf_read = ide_tf_read, 398 399 .input_data = ide_input_data, 400 .output_data = ide_output_data, 401}; 402 403void ide_fix_driveid(u16 *id) 404{ 405#ifndef __LITTLE_ENDIAN 406# ifdef __BIG_ENDIAN 407 int i; 408 409 for (i = 0; i < 256; i++) 410 id[i] = __le16_to_cpu(id[i]); 411# else 412# error "Please fix <asm/byteorder.h>" 413# endif 414#endif 415} 416 417/* 418 * ide_fixstring() cleans up and (optionally) byte-swaps a text string, 419 * removing leading/trailing blanks and compressing internal blanks. 420 * It is primarily used to tidy up the model name/number fields as 421 * returned by the ATA_CMD_ID_ATA[PI] commands. 422 */ 423 424void ide_fixstring (u8 *s, const int bytecount, const int byteswap) 425{ 426 u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */ 427 428 if (byteswap) { 429 /* convert from big-endian to host byte order */ 430 for (p = s ; p != end ; p += 2) 431 be16_to_cpus((u16 *) p); 432 } 433 434 /* strip leading blanks */ 435 p = s; 436 while (s != end && *s == ' ') 437 ++s; 438 /* compress internal blanks and strip trailing blanks */ 439 while (s != end && *s) { 440 if (*s++ != ' ' || (s != end && *s && *s != ' ')) 441 *p++ = *(s-1); 442 } 443 /* wipe out trailing garbage */ 444 while (p != end) 445 *p++ = '\0'; 446} 447 448EXPORT_SYMBOL(ide_fixstring); 449 450/* 451 * Needed for PCI irq sharing 452 */ 453int drive_is_ready (ide_drive_t *drive) 454{ 455 ide_hwif_t *hwif = HWIF(drive); 456 u8 stat = 0; 457 458 if (drive->waiting_for_dma) 459 return hwif->dma_ops->dma_test_irq(drive); 460 461#if 0 462 /* need to guarantee 400ns since last command was issued */ 463 udelay(1); 464#endif 465 466 /* 467 * We do a passive status test under shared PCI interrupts on 468 * cards that truly share the ATA side interrupt, but may also share 469 * an interrupt with another pci card/device. We make no assumptions 470 * about possible isa-pnp and pci-pnp issues yet. 471 */ 472 if (hwif->io_ports.ctl_addr) 473 stat = hwif->tp_ops->read_altstatus(hwif); 474 else 475 /* Note: this may clear a pending IRQ!! */ 476 stat = hwif->tp_ops->read_status(hwif); 477 478 if (stat & ATA_BUSY) 479 /* drive busy: definitely not interrupting */ 480 return 0; 481 482 /* drive ready: *might* be interrupting */ 483 return 1; 484} 485 486EXPORT_SYMBOL(drive_is_ready); 487 488/* 489 * This routine busy-waits for the drive status to be not "busy". 490 * It then checks the status for all of the "good" bits and none 491 * of the "bad" bits, and if all is okay it returns 0. All other 492 * cases return error -- caller may then invoke ide_error(). 493 * 494 * This routine should get fixed to not hog the cpu during extra long waits.. 495 * That could be done by busy-waiting for the first jiffy or two, and then 496 * setting a timer to wake up at half second intervals thereafter, 497 * until timeout is achieved, before timing out. 498 */ 499static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat) 500{ 501 ide_hwif_t *hwif = drive->hwif; 502 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 503 unsigned long flags; 504 int i; 505 u8 stat; 506 507 udelay(1); /* spec allows drive 400ns to assert "BUSY" */ 508 stat = tp_ops->read_status(hwif); 509 510 if (stat & ATA_BUSY) { 511 local_irq_set(flags); 512 timeout += jiffies; 513 while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) { 514 if (time_after(jiffies, timeout)) { 515 /* 516 * One last read after the timeout in case 517 * heavy interrupt load made us not make any 518 * progress during the timeout.. 519 */ 520 stat = tp_ops->read_status(hwif); 521 if ((stat & ATA_BUSY) == 0) 522 break; 523 524 local_irq_restore(flags); 525 *rstat = stat; 526 return -EBUSY; 527 } 528 } 529 local_irq_restore(flags); 530 } 531 /* 532 * Allow status to settle, then read it again. 533 * A few rare drives vastly violate the 400ns spec here, 534 * so we'll wait up to 10usec for a "good" status 535 * rather than expensively fail things immediately. 536 * This fix courtesy of Matthew Faupel & Niccolo Rigacci. 537 */ 538 for (i = 0; i < 10; i++) { 539 udelay(1); 540 stat = tp_ops->read_status(hwif); 541 542 if (OK_STAT(stat, good, bad)) { 543 *rstat = stat; 544 return 0; 545 } 546 } 547 *rstat = stat; 548 return -EFAULT; 549} 550 551/* 552 * In case of error returns error value after doing "*startstop = ide_error()". 553 * The caller should return the updated value of "startstop" in this case, 554 * "startstop" is unchanged when the function returns 0. 555 */ 556int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout) 557{ 558 int err; 559 u8 stat; 560 561 /* bail early if we've exceeded max_failures */ 562 if (drive->max_failures && (drive->failures > drive->max_failures)) { 563 *startstop = ide_stopped; 564 return 1; 565 } 566 567 err = __ide_wait_stat(drive, good, bad, timeout, &stat); 568 569 if (err) { 570 char *s = (err == -EBUSY) ? "status timeout" : "status error"; 571 *startstop = ide_error(drive, s, stat); 572 } 573 574 return err; 575} 576 577EXPORT_SYMBOL(ide_wait_stat); 578 579/** 580 * ide_in_drive_list - look for drive in black/white list 581 * @id: drive identifier 582 * @table: list to inspect 583 * 584 * Look for a drive in the blacklist and the whitelist tables 585 * Returns 1 if the drive is found in the table. 586 */ 587 588int ide_in_drive_list(u16 *id, const struct drive_list_entry *table) 589{ 590 for ( ; table->id_model; table++) 591 if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) && 592 (!table->id_firmware || 593 strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware))) 594 return 1; 595 return 0; 596} 597 598EXPORT_SYMBOL_GPL(ide_in_drive_list); 599 600/* 601 * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid. 602 * We list them here and depend on the device side cable detection for them. 603 * 604 * Some optical devices with the buggy firmwares have the same problem. 605 */ 606static const struct drive_list_entry ivb_list[] = { 607 { "QUANTUM FIREBALLlct10 05" , "A03.0900" }, 608 { "TSSTcorp CDDVDW SH-S202J" , "SB00" }, 609 { "TSSTcorp CDDVDW SH-S202J" , "SB01" }, 610 { "TSSTcorp CDDVDW SH-S202N" , "SB00" }, 611 { "TSSTcorp CDDVDW SH-S202N" , "SB01" }, 612 { "TSSTcorp CDDVDW SH-S202H" , "SB00" }, 613 { "TSSTcorp CDDVDW SH-S202H" , "SB01" }, 614 { NULL , NULL } 615}; 616 617/* 618 * All hosts that use the 80c ribbon must use! 619 * The name is derived from upper byte of word 93 and the 80c ribbon. 620 */ 621u8 eighty_ninty_three (ide_drive_t *drive) 622{ 623 ide_hwif_t *hwif = drive->hwif; 624 u16 *id = drive->id; 625 int ivb = ide_in_drive_list(id, ivb_list); 626 627 if (hwif->cbl == ATA_CBL_PATA40_SHORT) 628 return 1; 629 630 if (ivb) 631 printk(KERN_DEBUG "%s: skipping word 93 validity check\n", 632 drive->name); 633 634 if (ide_dev_is_sata(id) && !ivb) 635 return 1; 636 637 if (hwif->cbl != ATA_CBL_PATA80 && !ivb) 638 goto no_80w; 639 640 /* 641 * FIXME: 642 * - change master/slave IDENTIFY order 643 * - force bit13 (80c cable present) check also for !ivb devices 644 * (unless the slave device is pre-ATA3) 645 */ 646 if ((id[ATA_ID_HW_CONFIG] & 0x4000) || 647 (ivb && (id[ATA_ID_HW_CONFIG] & 0x2000))) 648 return 1; 649 650no_80w: 651 if (drive->udma33_warned == 1) 652 return 0; 653 654 printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, " 655 "limiting max speed to UDMA33\n", 656 drive->name, 657 hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host"); 658 659 drive->udma33_warned = 1; 660 661 return 0; 662} 663 664int ide_driveid_update(ide_drive_t *drive) 665{ 666 ide_hwif_t *hwif = drive->hwif; 667 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 668 u16 *id; 669 unsigned long timeout, flags; 670 u8 stat; 671 672 /* 673 * Re-read drive->id for possible DMA mode 674 * change (copied from ide-probe.c) 675 */ 676 677 SELECT_MASK(drive, 1); 678 tp_ops->set_irq(hwif, 0); 679 msleep(50); 680 tp_ops->exec_command(hwif, ATA_CMD_ID_ATA); 681 timeout = jiffies + WAIT_WORSTCASE; 682 do { 683 if (time_after(jiffies, timeout)) { 684 SELECT_MASK(drive, 0); 685 return 0; /* drive timed-out */ 686 } 687 688 msleep(50); /* give drive a breather */ 689 stat = tp_ops->read_altstatus(hwif); 690 } while (stat & ATA_BUSY); 691 692 msleep(50); /* wait for IRQ and ATA_DRQ */ 693 stat = tp_ops->read_status(hwif); 694 695 if (!OK_STAT(stat, ATA_DRQ, BAD_R_STAT)) { 696 SELECT_MASK(drive, 0); 697 printk("%s: CHECK for good STATUS\n", drive->name); 698 return 0; 699 } 700 local_irq_save(flags); 701 SELECT_MASK(drive, 0); 702 id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC); 703 if (!id) { 704 local_irq_restore(flags); 705 return 0; 706 } 707 tp_ops->input_data(drive, NULL, id, SECTOR_SIZE); 708 (void)tp_ops->read_status(hwif); /* clear drive IRQ */ 709 local_irq_enable(); 710 local_irq_restore(flags); 711 ide_fix_driveid(id); 712 713 drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES]; 714 drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES]; 715 drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES]; 716 /* anything more ? */ 717 718 kfree(id); 719 720 if (drive->using_dma && ide_id_dma_bug(drive)) 721 ide_dma_off(drive); 722 723 return 1; 724} 725 726int ide_config_drive_speed(ide_drive_t *drive, u8 speed) 727{ 728 ide_hwif_t *hwif = drive->hwif; 729 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 730 u16 *id = drive->id, i; 731 int error = 0; 732 u8 stat; 733 ide_task_t task; 734 735#ifdef CONFIG_BLK_DEV_IDEDMA 736 if (hwif->dma_ops) /* check if host supports DMA */ 737 hwif->dma_ops->dma_host_set(drive, 0); 738#endif 739 740 /* Skip setting PIO flow-control modes on pre-EIDE drives */ 741 if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0) 742 goto skip; 743 744 /* 745 * Don't use ide_wait_cmd here - it will 746 * attempt to set_geometry and recalibrate, 747 * but for some reason these don't work at 748 * this point (lost interrupt). 749 */ 750 /* 751 * Select the drive, and issue the SETFEATURES command 752 */ 753 disable_irq_nosync(hwif->irq); 754 755 /* 756 * FIXME: we race against the running IRQ here if 757 * this is called from non IRQ context. If we use 758 * disable_irq() we hang on the error path. Work 759 * is needed. 760 */ 761 762 udelay(1); 763 SELECT_DRIVE(drive); 764 SELECT_MASK(drive, 0); 765 udelay(1); 766 tp_ops->set_irq(hwif, 0); 767 768 memset(&task, 0, sizeof(task)); 769 task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT; 770 task.tf.feature = SETFEATURES_XFER; 771 task.tf.nsect = speed; 772 773 tp_ops->tf_load(drive, &task); 774 775 tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES); 776 777 if (drive->quirk_list == 2) 778 tp_ops->set_irq(hwif, 1); 779 780 error = __ide_wait_stat(drive, drive->ready_stat, 781 ATA_BUSY | ATA_DRQ | ATA_ERR, 782 WAIT_CMD, &stat); 783 784 SELECT_MASK(drive, 0); 785 786 enable_irq(hwif->irq); 787 788 if (error) { 789 (void) ide_dump_status(drive, "set_drive_speed_status", stat); 790 return error; 791 } 792 793 id[ATA_ID_UDMA_MODES] &= ~0xFF00; 794 id[ATA_ID_MWDMA_MODES] &= ~0x0F00; 795 id[ATA_ID_SWDMA_MODES] &= ~0x0F00; 796 797 skip: 798#ifdef CONFIG_BLK_DEV_IDEDMA 799 if (speed >= XFER_SW_DMA_0 && drive->using_dma) 800 hwif->dma_ops->dma_host_set(drive, 1); 801 else if (hwif->dma_ops) /* check if host supports DMA */ 802 ide_dma_off_quietly(drive); 803#endif 804 805 if (speed >= XFER_UDMA_0) { 806 i = 1 << (speed - XFER_UDMA_0); 807 id[ATA_ID_UDMA_MODES] |= (i << 8 | i); 808 } else if (speed >= XFER_MW_DMA_0) { 809 i = 1 << (speed - XFER_MW_DMA_0); 810 id[ATA_ID_MWDMA_MODES] |= (i << 8 | i); 811 } else if (speed >= XFER_SW_DMA_0) { 812 i = 1 << (speed - XFER_SW_DMA_0); 813 id[ATA_ID_SWDMA_MODES] |= (i << 8 | i); 814 } 815 816 if (!drive->init_speed) 817 drive->init_speed = speed; 818 drive->current_speed = speed; 819 return error; 820} 821 822/* 823 * This should get invoked any time we exit the driver to 824 * wait for an interrupt response from a drive. handler() points 825 * at the appropriate code to handle the next interrupt, and a 826 * timer is started to prevent us from waiting forever in case 827 * something goes wrong (see the ide_timer_expiry() handler later on). 828 * 829 * See also ide_execute_command 830 */ 831static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, 832 unsigned int timeout, ide_expiry_t *expiry) 833{ 834 ide_hwgroup_t *hwgroup = HWGROUP(drive); 835 836 BUG_ON(hwgroup->handler); 837 hwgroup->handler = handler; 838 hwgroup->expiry = expiry; 839 hwgroup->timer.expires = jiffies + timeout; 840 hwgroup->req_gen_timer = hwgroup->req_gen; 841 add_timer(&hwgroup->timer); 842} 843 844void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, 845 unsigned int timeout, ide_expiry_t *expiry) 846{ 847 unsigned long flags; 848 spin_lock_irqsave(&ide_lock, flags); 849 __ide_set_handler(drive, handler, timeout, expiry); 850 spin_unlock_irqrestore(&ide_lock, flags); 851} 852 853EXPORT_SYMBOL(ide_set_handler); 854 855/** 856 * ide_execute_command - execute an IDE command 857 * @drive: IDE drive to issue the command against 858 * @command: command byte to write 859 * @handler: handler for next phase 860 * @timeout: timeout for command 861 * @expiry: handler to run on timeout 862 * 863 * Helper function to issue an IDE command. This handles the 864 * atomicity requirements, command timing and ensures that the 865 * handler and IRQ setup do not race. All IDE command kick off 866 * should go via this function or do equivalent locking. 867 */ 868 869void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler, 870 unsigned timeout, ide_expiry_t *expiry) 871{ 872 unsigned long flags; 873 ide_hwif_t *hwif = HWIF(drive); 874 875 spin_lock_irqsave(&ide_lock, flags); 876 __ide_set_handler(drive, handler, timeout, expiry); 877 hwif->tp_ops->exec_command(hwif, cmd); 878 /* 879 * Drive takes 400nS to respond, we must avoid the IRQ being 880 * serviced before that. 881 * 882 * FIXME: we could skip this delay with care on non shared devices 883 */ 884 ndelay(400); 885 spin_unlock_irqrestore(&ide_lock, flags); 886} 887EXPORT_SYMBOL(ide_execute_command); 888 889void ide_execute_pkt_cmd(ide_drive_t *drive) 890{ 891 ide_hwif_t *hwif = drive->hwif; 892 unsigned long flags; 893 894 spin_lock_irqsave(&ide_lock, flags); 895 hwif->tp_ops->exec_command(hwif, ATA_CMD_PACKET); 896 ndelay(400); 897 spin_unlock_irqrestore(&ide_lock, flags); 898} 899EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd); 900 901static inline void ide_complete_drive_reset(ide_drive_t *drive, int err) 902{ 903 struct request *rq = drive->hwif->hwgroup->rq; 904 905 if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET) 906 ide_end_request(drive, err ? err : 1, 0); 907} 908 909/* needed below */ 910static ide_startstop_t do_reset1 (ide_drive_t *, int); 911 912/* 913 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms 914 * during an atapi drive reset operation. If the drive has not yet responded, 915 * and we have not yet hit our maximum waiting time, then the timer is restarted 916 * for another 50ms. 917 */ 918static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive) 919{ 920 ide_hwif_t *hwif = drive->hwif; 921 ide_hwgroup_t *hwgroup = hwif->hwgroup; 922 u8 stat; 923 924 SELECT_DRIVE(drive); 925 udelay (10); 926 stat = hwif->tp_ops->read_status(hwif); 927 928 if (OK_STAT(stat, 0, ATA_BUSY)) 929 printk("%s: ATAPI reset complete\n", drive->name); 930 else { 931 if (time_before(jiffies, hwgroup->poll_timeout)) { 932 ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL); 933 /* continue polling */ 934 return ide_started; 935 } 936 /* end of polling */ 937 hwgroup->polling = 0; 938 printk("%s: ATAPI reset timed-out, status=0x%02x\n", 939 drive->name, stat); 940 /* do it the old fashioned way */ 941 return do_reset1(drive, 1); 942 } 943 /* done polling */ 944 hwgroup->polling = 0; 945 ide_complete_drive_reset(drive, 0); 946 return ide_stopped; 947} 948 949/* 950 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms 951 * during an ide reset operation. If the drives have not yet responded, 952 * and we have not yet hit our maximum waiting time, then the timer is restarted 953 * for another 50ms. 954 */ 955static ide_startstop_t reset_pollfunc (ide_drive_t *drive) 956{ 957 ide_hwgroup_t *hwgroup = HWGROUP(drive); 958 ide_hwif_t *hwif = HWIF(drive); 959 const struct ide_port_ops *port_ops = hwif->port_ops; 960 u8 tmp; 961 int err = 0; 962 963 if (port_ops && port_ops->reset_poll) { 964 err = port_ops->reset_poll(drive); 965 if (err) { 966 printk(KERN_ERR "%s: host reset_poll failure for %s.\n", 967 hwif->name, drive->name); 968 goto out; 969 } 970 } 971 972 tmp = hwif->tp_ops->read_status(hwif); 973 974 if (!OK_STAT(tmp, 0, ATA_BUSY)) { 975 if (time_before(jiffies, hwgroup->poll_timeout)) { 976 ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL); 977 /* continue polling */ 978 return ide_started; 979 } 980 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp); 981 drive->failures++; 982 err = -EIO; 983 } else { 984 printk("%s: reset: ", hwif->name); 985 tmp = ide_read_error(drive); 986 987 if (tmp == 1) { 988 printk("success\n"); 989 drive->failures = 0; 990 } else { 991 drive->failures++; 992 printk("master: "); 993 switch (tmp & 0x7f) { 994 case 1: printk("passed"); 995 break; 996 case 2: printk("formatter device error"); 997 break; 998 case 3: printk("sector buffer error"); 999 break; 1000 case 4: printk("ECC circuitry error"); 1001 break; 1002 case 5: printk("controlling MPU error"); 1003 break; 1004 default:printk("error (0x%02x?)", tmp); 1005 } 1006 if (tmp & 0x80) 1007 printk("; slave: failed"); 1008 printk("\n"); 1009 err = -EIO; 1010 } 1011 } 1012out: 1013 hwgroup->polling = 0; /* done polling */ 1014 ide_complete_drive_reset(drive, err); 1015 return ide_stopped; 1016} 1017 1018static void ide_disk_pre_reset(ide_drive_t *drive) 1019{ 1020 int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1; 1021 1022 drive->special.all = 0; 1023 drive->special.b.set_geometry = legacy; 1024 drive->special.b.recalibrate = legacy; 1025 drive->mult_count = 0; 1026 if (!drive->keep_settings && !drive->using_dma) 1027 drive->mult_req = 0; 1028 if (drive->mult_req != drive->mult_count) 1029 drive->special.b.set_multmode = 1; 1030} 1031 1032static void pre_reset(ide_drive_t *drive) 1033{ 1034 const struct ide_port_ops *port_ops = drive->hwif->port_ops; 1035 1036 if (drive->media == ide_disk) 1037 ide_disk_pre_reset(drive); 1038 else 1039 drive->post_reset = 1; 1040 1041 if (drive->using_dma) { 1042 if (drive->crc_count) 1043 ide_check_dma_crc(drive); 1044 else 1045 ide_dma_off(drive); 1046 } 1047 1048 if (!drive->keep_settings) { 1049 if (!drive->using_dma) { 1050 drive->unmask = 0; 1051 drive->io_32bit = 0; 1052 } 1053 return; 1054 } 1055 1056 if (port_ops && port_ops->pre_reset) 1057 port_ops->pre_reset(drive); 1058 1059 if (drive->current_speed != 0xff) 1060 drive->desired_speed = drive->current_speed; 1061 drive->current_speed = 0xff; 1062} 1063 1064/* 1065 * do_reset1() attempts to recover a confused drive by resetting it. 1066 * Unfortunately, resetting a disk drive actually resets all devices on 1067 * the same interface, so it can really be thought of as resetting the 1068 * interface rather than resetting the drive. 1069 * 1070 * ATAPI devices have their own reset mechanism which allows them to be 1071 * individually reset without clobbering other devices on the same interface. 1072 * 1073 * Unfortunately, the IDE interface does not generate an interrupt to let 1074 * us know when the reset operation has finished, so we must poll for this. 1075 * Equally poor, though, is the fact that this may a very long time to complete, 1076 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it, 1077 * we set a timer to poll at 50ms intervals. 1078 */ 1079static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi) 1080{ 1081 unsigned int unit; 1082 unsigned long flags; 1083 ide_hwif_t *hwif; 1084 ide_hwgroup_t *hwgroup; 1085 struct ide_io_ports *io_ports; 1086 const struct ide_tp_ops *tp_ops; 1087 const struct ide_port_ops *port_ops; 1088 1089 spin_lock_irqsave(&ide_lock, flags); 1090 hwif = HWIF(drive); 1091 hwgroup = HWGROUP(drive); 1092 1093 io_ports = &hwif->io_ports; 1094 1095 tp_ops = hwif->tp_ops; 1096 1097 /* We must not reset with running handlers */ 1098 BUG_ON(hwgroup->handler != NULL); 1099 1100 /* For an ATAPI device, first try an ATAPI SRST. */ 1101 if (drive->media != ide_disk && !do_not_try_atapi) { 1102 pre_reset(drive); 1103 SELECT_DRIVE(drive); 1104 udelay (20); 1105 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET); 1106 ndelay(400); 1107 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE; 1108 hwgroup->polling = 1; 1109 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL); 1110 spin_unlock_irqrestore(&ide_lock, flags); 1111 return ide_started; 1112 } 1113 1114 /* 1115 * First, reset any device state data we were maintaining 1116 * for any of the drives on this interface. 1117 */ 1118 for (unit = 0; unit < MAX_DRIVES; ++unit) 1119 pre_reset(&hwif->drives[unit]); 1120 1121 if (io_ports->ctl_addr == 0) { 1122 spin_unlock_irqrestore(&ide_lock, flags); 1123 ide_complete_drive_reset(drive, -ENXIO); 1124 return ide_stopped; 1125 } 1126 1127 /* 1128 * Note that we also set nIEN while resetting the device, 1129 * to mask unwanted interrupts from the interface during the reset. 1130 * However, due to the design of PC hardware, this will cause an 1131 * immediate interrupt due to the edge transition it produces. 1132 * This single interrupt gives us a "fast poll" for drives that 1133 * recover from reset very quickly, saving us the first 50ms wait time. 1134 * 1135 * TODO: add ->softreset method and stop abusing ->set_irq 1136 */ 1137 /* set SRST and nIEN */ 1138 tp_ops->set_irq(hwif, 4); 1139 /* more than enough time */ 1140 udelay(10); 1141 /* clear SRST, leave nIEN (unless device is on the quirk list) */ 1142 tp_ops->set_irq(hwif, drive->quirk_list == 2); 1143 /* more than enough time */ 1144 udelay(10); 1145 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE; 1146 hwgroup->polling = 1; 1147 __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL); 1148 1149 /* 1150 * Some weird controller like resetting themselves to a strange 1151 * state when the disks are reset this way. At least, the Winbond 1152 * 553 documentation says that 1153 */ 1154 port_ops = hwif->port_ops; 1155 if (port_ops && port_ops->resetproc) 1156 port_ops->resetproc(drive); 1157 1158 spin_unlock_irqrestore(&ide_lock, flags); 1159 return ide_started; 1160} 1161 1162/* 1163 * ide_do_reset() is the entry point to the drive/interface reset code. 1164 */ 1165 1166ide_startstop_t ide_do_reset (ide_drive_t *drive) 1167{ 1168 return do_reset1(drive, 0); 1169} 1170 1171EXPORT_SYMBOL(ide_do_reset); 1172 1173/* 1174 * ide_wait_not_busy() waits for the currently selected device on the hwif 1175 * to report a non-busy status, see comments in ide_probe_port(). 1176 */ 1177int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout) 1178{ 1179 u8 stat = 0; 1180 1181 while(timeout--) { 1182 /* 1183 * Turn this into a schedule() sleep once I'm sure 1184 * about locking issues (2.5 work ?). 1185 */ 1186 mdelay(1); 1187 stat = hwif->tp_ops->read_status(hwif); 1188 if ((stat & ATA_BUSY) == 0) 1189 return 0; 1190 /* 1191 * Assume a value of 0xff means nothing is connected to 1192 * the interface and it doesn't implement the pull-down 1193 * resistor on D7. 1194 */ 1195 if (stat == 0xff) 1196 return -ENODEV; 1197 touch_softlockup_watchdog(); 1198 touch_nmi_watchdog(); 1199 } 1200 return -EBUSY; 1201} 1202 1203EXPORT_SYMBOL_GPL(ide_wait_not_busy); 1204 1205