ide.c revision 387750c3bf49c22f6189436032145e2131985076
1/* 2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below) 3 * Copyrifht (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz 4 */ 5 6/* 7 * Mostly written by Mark Lord <mlord@pobox.com> 8 * and Gadi Oxman <gadio@netvision.net.il> 9 * and Andre Hedrick <andre@linux-ide.org> 10 * 11 * See linux/MAINTAINERS for address of current maintainer. 12 * 13 * This is the multiple IDE interface driver, as evolved from hd.c. 14 * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs 15 * (usually 14 & 15). 16 * There can be up to two drives per interface, as per the ATA-2 spec. 17 * 18 * ... 19 * 20 * From hd.c: 21 * | 22 * | It traverses the request-list, using interrupts to jump between functions. 23 * | As nearly all functions can be called within interrupts, we may not sleep. 24 * | Special care is recommended. Have Fun! 25 * | 26 * | modified by Drew Eckhardt to check nr of hd's from the CMOS. 27 * | 28 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug 29 * | in the early extended-partition checks and added DM partitions. 30 * | 31 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI). 32 * | 33 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads", 34 * | and general streamlining by Mark Lord (mlord@pobox.com). 35 * 36 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by: 37 * 38 * Mark Lord (mlord@pobox.com) (IDE Perf.Pkg) 39 * Delman Lee (delman@ieee.org) ("Mr. atdisk2") 40 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom) 41 * 42 * This was a rewrite of just about everything from hd.c, though some original 43 * code is still sprinkled about. Think of it as a major evolution, with 44 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au 45 */ 46 47#define _IDE_C /* Tell ide.h it's really us */ 48 49#include <linux/module.h> 50#include <linux/types.h> 51#include <linux/string.h> 52#include <linux/kernel.h> 53#include <linux/timer.h> 54#include <linux/mm.h> 55#include <linux/interrupt.h> 56#include <linux/major.h> 57#include <linux/errno.h> 58#include <linux/genhd.h> 59#include <linux/blkpg.h> 60#include <linux/slab.h> 61#include <linux/init.h> 62#include <linux/pci.h> 63#include <linux/delay.h> 64#include <linux/ide.h> 65#include <linux/completion.h> 66#include <linux/reboot.h> 67#include <linux/cdrom.h> 68#include <linux/seq_file.h> 69#include <linux/device.h> 70#include <linux/bitops.h> 71 72#include <asm/byteorder.h> 73#include <asm/irq.h> 74#include <asm/uaccess.h> 75#include <asm/io.h> 76 77 78/* default maximum number of failures */ 79#define IDE_DEFAULT_MAX_FAILURES 1 80 81struct class *ide_port_class; 82 83static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR, 84 IDE2_MAJOR, IDE3_MAJOR, 85 IDE4_MAJOR, IDE5_MAJOR, 86 IDE6_MAJOR, IDE7_MAJOR, 87 IDE8_MAJOR, IDE9_MAJOR }; 88 89static int idebus_parameter; /* holds the "idebus=" parameter */ 90static int system_bus_speed; /* holds what we think is VESA/PCI bus speed */ 91 92DEFINE_MUTEX(ide_cfg_mtx); 93 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock); 94 95int noautodma = 0; 96 97ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */ 98 99static void ide_port_init_devices_data(ide_hwif_t *); 100 101/* 102 * Do not even *think* about calling this! 103 */ 104void ide_init_port_data(ide_hwif_t *hwif, unsigned int index) 105{ 106 /* bulk initialize hwif & drive info with zeros */ 107 memset(hwif, 0, sizeof(ide_hwif_t)); 108 109 /* fill in any non-zero initial values */ 110 hwif->index = index; 111 hwif->major = ide_hwif_to_major[index]; 112 113 hwif->name[0] = 'i'; 114 hwif->name[1] = 'd'; 115 hwif->name[2] = 'e'; 116 hwif->name[3] = '0' + index; 117 118 hwif->bus_state = BUSSTATE_ON; 119 120 init_completion(&hwif->gendev_rel_comp); 121 122 default_hwif_iops(hwif); 123 default_hwif_transport(hwif); 124 125 ide_port_init_devices_data(hwif); 126} 127EXPORT_SYMBOL_GPL(ide_init_port_data); 128 129static void ide_port_init_devices_data(ide_hwif_t *hwif) 130{ 131 int unit; 132 133 for (unit = 0; unit < MAX_DRIVES; ++unit) { 134 ide_drive_t *drive = &hwif->drives[unit]; 135 u8 j = (hwif->index * MAX_DRIVES) + unit; 136 137 memset(drive, 0, sizeof(*drive)); 138 139 drive->media = ide_disk; 140 drive->select.all = (unit<<4)|0xa0; 141 drive->hwif = hwif; 142 drive->ctl = 0x08; 143 drive->ready_stat = READY_STAT; 144 drive->bad_wstat = BAD_W_STAT; 145 drive->special.b.recalibrate = 1; 146 drive->special.b.set_geometry = 1; 147 drive->name[0] = 'h'; 148 drive->name[1] = 'd'; 149 drive->name[2] = 'a' + j; 150 drive->max_failures = IDE_DEFAULT_MAX_FAILURES; 151 152 INIT_LIST_HEAD(&drive->list); 153 init_completion(&drive->gendev_rel_comp); 154 } 155} 156 157/* 158 * init_ide_data() sets reasonable default values into all fields 159 * of all instances of the hwifs and drives, but only on the first call. 160 * Subsequent calls have no effect (they don't wipe out anything). 161 * 162 * This routine is normally called at driver initialization time, 163 * but may also be called MUCH earlier during kernel "command-line" 164 * parameter processing. As such, we cannot depend on any other parts 165 * of the kernel (such as memory allocation) to be functioning yet. 166 * 167 * This is too bad, as otherwise we could dynamically allocate the 168 * ide_drive_t structs as needed, rather than always consuming memory 169 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them. 170 * 171 * FIXME: We should stuff the setup data into __init and copy the 172 * relevant hwifs/allocate them properly during boot. 173 */ 174#define MAGIC_COOKIE 0x12345678 175static void __init init_ide_data (void) 176{ 177 unsigned int index; 178 static unsigned long magic_cookie = MAGIC_COOKIE; 179 180 if (magic_cookie != MAGIC_COOKIE) 181 return; /* already initialized */ 182 magic_cookie = 0; 183 184 /* Initialise all interface structures */ 185 for (index = 0; index < MAX_HWIFS; ++index) { 186 ide_hwif_t *hwif = &ide_hwifs[index]; 187 188 ide_init_port_data(hwif, index); 189 } 190} 191 192/** 193 * ide_system_bus_speed - guess bus speed 194 * 195 * ide_system_bus_speed() returns what we think is the system VESA/PCI 196 * bus speed (in MHz). This is used for calculating interface PIO timings. 197 * The default is 40 for known PCI systems, 50 otherwise. 198 * The "idebus=xx" parameter can be used to override this value. 199 * The actual value to be used is computed/displayed the first time 200 * through. Drivers should only use this as a last resort. 201 * 202 * Returns a guessed speed in MHz. 203 */ 204 205static int ide_system_bus_speed(void) 206{ 207#ifdef CONFIG_PCI 208 static struct pci_device_id pci_default[] = { 209 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) }, 210 { } 211 }; 212#else 213#define pci_default 0 214#endif /* CONFIG_PCI */ 215 216 /* user supplied value */ 217 if (idebus_parameter) 218 return idebus_parameter; 219 220 /* safe default value for PCI or VESA and PCI*/ 221 return pci_dev_present(pci_default) ? 33 : 50; 222} 223 224void ide_remove_port_from_hwgroup(ide_hwif_t *hwif) 225{ 226 ide_hwgroup_t *hwgroup = hwif->hwgroup; 227 228 spin_lock_irq(&ide_lock); 229 /* 230 * Remove us from the hwgroup, and free 231 * the hwgroup if we were the only member 232 */ 233 if (hwif->next == hwif) { 234 BUG_ON(hwgroup->hwif != hwif); 235 kfree(hwgroup); 236 } else { 237 /* There is another interface in hwgroup. 238 * Unlink us, and set hwgroup->drive and ->hwif to 239 * something sane. 240 */ 241 ide_hwif_t *g = hwgroup->hwif; 242 243 while (g->next != hwif) 244 g = g->next; 245 g->next = hwif->next; 246 if (hwgroup->hwif == hwif) { 247 /* Chose a random hwif for hwgroup->hwif. 248 * It's guaranteed that there are no drives 249 * left in the hwgroup. 250 */ 251 BUG_ON(hwgroup->drive != NULL); 252 hwgroup->hwif = g; 253 } 254 BUG_ON(hwgroup->hwif == hwif); 255 } 256 spin_unlock_irq(&ide_lock); 257} 258 259/* Called with ide_lock held. */ 260static void __ide_port_unregister_devices(ide_hwif_t *hwif) 261{ 262 int i; 263 264 for (i = 0; i < MAX_DRIVES; i++) { 265 ide_drive_t *drive = &hwif->drives[i]; 266 267 if (drive->present) { 268 spin_unlock_irq(&ide_lock); 269 device_unregister(&drive->gendev); 270 wait_for_completion(&drive->gendev_rel_comp); 271 spin_lock_irq(&ide_lock); 272 } 273 } 274} 275 276void ide_port_unregister_devices(ide_hwif_t *hwif) 277{ 278 mutex_lock(&ide_cfg_mtx); 279 spin_lock_irq(&ide_lock); 280 __ide_port_unregister_devices(hwif); 281 hwif->present = 0; 282 ide_port_init_devices_data(hwif); 283 spin_unlock_irq(&ide_lock); 284 mutex_unlock(&ide_cfg_mtx); 285} 286EXPORT_SYMBOL_GPL(ide_port_unregister_devices); 287 288/** 289 * ide_unregister - free an IDE interface 290 * @hwif: IDE interface 291 * 292 * Perform the final unregister of an IDE interface. At the moment 293 * we don't refcount interfaces so this will also get split up. 294 * 295 * Locking: 296 * The caller must not hold the IDE locks 297 * The drive present/vanishing is not yet properly locked 298 * Take care with the callbacks. These have been split to avoid 299 * deadlocking the IDE layer. The shutdown callback is called 300 * before we take the lock and free resources. It is up to the 301 * caller to be sure there is no pending I/O here, and that 302 * the interface will not be reopened (present/vanishing locking 303 * isn't yet done BTW). After we commit to the final kill we 304 * call the cleanup callback with the ide locks held. 305 * 306 * Unregister restores the hwif structures to the default state. 307 * This is raving bonkers. 308 */ 309 310void ide_unregister(ide_hwif_t *hwif) 311{ 312 ide_hwif_t *g; 313 ide_hwgroup_t *hwgroup; 314 int irq_count = 0; 315 316 BUG_ON(in_interrupt()); 317 BUG_ON(irqs_disabled()); 318 mutex_lock(&ide_cfg_mtx); 319 spin_lock_irq(&ide_lock); 320 if (!hwif->present) 321 goto abort; 322 __ide_port_unregister_devices(hwif); 323 hwif->present = 0; 324 325 spin_unlock_irq(&ide_lock); 326 327 ide_proc_unregister_port(hwif); 328 329 hwgroup = hwif->hwgroup; 330 /* 331 * free the irq if we were the only hwif using it 332 */ 333 g = hwgroup->hwif; 334 do { 335 if (g->irq == hwif->irq) 336 ++irq_count; 337 g = g->next; 338 } while (g != hwgroup->hwif); 339 if (irq_count == 1) 340 free_irq(hwif->irq, hwgroup); 341 342 ide_remove_port_from_hwgroup(hwif); 343 344 device_unregister(hwif->portdev); 345 device_unregister(&hwif->gendev); 346 wait_for_completion(&hwif->gendev_rel_comp); 347 348 /* 349 * Remove us from the kernel's knowledge 350 */ 351 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS); 352 kfree(hwif->sg_table); 353 unregister_blkdev(hwif->major, hwif->name); 354 spin_lock_irq(&ide_lock); 355 356 if (hwif->dma_base) 357 ide_release_dma_engine(hwif); 358 359 /* restore hwif data to pristine status */ 360 ide_init_port_data(hwif, hwif->index); 361 362abort: 363 spin_unlock_irq(&ide_lock); 364 mutex_unlock(&ide_cfg_mtx); 365} 366 367EXPORT_SYMBOL(ide_unregister); 368 369void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw) 370{ 371 memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports)); 372 hwif->irq = hw->irq; 373 hwif->chipset = hw->chipset; 374 hwif->gendev.parent = hw->dev; 375 hwif->ack_intr = hw->ack_intr; 376} 377EXPORT_SYMBOL_GPL(ide_init_port_hw); 378 379/* 380 * Locks for IDE setting functionality 381 */ 382 383DEFINE_MUTEX(ide_setting_mtx); 384 385EXPORT_SYMBOL_GPL(ide_setting_mtx); 386 387/** 388 * ide_spin_wait_hwgroup - wait for group 389 * @drive: drive in the group 390 * 391 * Wait for an IDE device group to go non busy and then return 392 * holding the ide_lock which guards the hwgroup->busy status 393 * and right to use it. 394 */ 395 396int ide_spin_wait_hwgroup (ide_drive_t *drive) 397{ 398 ide_hwgroup_t *hwgroup = HWGROUP(drive); 399 unsigned long timeout = jiffies + (3 * HZ); 400 401 spin_lock_irq(&ide_lock); 402 403 while (hwgroup->busy) { 404 unsigned long lflags; 405 spin_unlock_irq(&ide_lock); 406 local_irq_set(lflags); 407 if (time_after(jiffies, timeout)) { 408 local_irq_restore(lflags); 409 printk(KERN_ERR "%s: channel busy\n", drive->name); 410 return -EBUSY; 411 } 412 local_irq_restore(lflags); 413 spin_lock_irq(&ide_lock); 414 } 415 return 0; 416} 417 418EXPORT_SYMBOL(ide_spin_wait_hwgroup); 419 420int set_io_32bit(ide_drive_t *drive, int arg) 421{ 422 if (drive->no_io_32bit) 423 return -EPERM; 424 425 if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1)) 426 return -EINVAL; 427 428 if (ide_spin_wait_hwgroup(drive)) 429 return -EBUSY; 430 431 drive->io_32bit = arg; 432 433 spin_unlock_irq(&ide_lock); 434 435 return 0; 436} 437 438static int set_ksettings(ide_drive_t *drive, int arg) 439{ 440 if (arg < 0 || arg > 1) 441 return -EINVAL; 442 443 if (ide_spin_wait_hwgroup(drive)) 444 return -EBUSY; 445 drive->keep_settings = arg; 446 spin_unlock_irq(&ide_lock); 447 448 return 0; 449} 450 451int set_using_dma(ide_drive_t *drive, int arg) 452{ 453#ifdef CONFIG_BLK_DEV_IDEDMA 454 ide_hwif_t *hwif = drive->hwif; 455 int err = -EPERM; 456 457 if (arg < 0 || arg > 1) 458 return -EINVAL; 459 460 if (!drive->id || !(drive->id->capability & 1)) 461 goto out; 462 463 if (hwif->dma_ops == NULL) 464 goto out; 465 466 err = -EBUSY; 467 if (ide_spin_wait_hwgroup(drive)) 468 goto out; 469 /* 470 * set ->busy flag, unlock and let it ride 471 */ 472 hwif->hwgroup->busy = 1; 473 spin_unlock_irq(&ide_lock); 474 475 err = 0; 476 477 if (arg) { 478 if (ide_set_dma(drive)) 479 err = -EIO; 480 } else 481 ide_dma_off(drive); 482 483 /* 484 * lock, clear ->busy flag and unlock before leaving 485 */ 486 spin_lock_irq(&ide_lock); 487 hwif->hwgroup->busy = 0; 488 spin_unlock_irq(&ide_lock); 489out: 490 return err; 491#else 492 if (arg < 0 || arg > 1) 493 return -EINVAL; 494 495 return -EPERM; 496#endif 497} 498 499int set_pio_mode(ide_drive_t *drive, int arg) 500{ 501 struct request rq; 502 ide_hwif_t *hwif = drive->hwif; 503 const struct ide_port_ops *port_ops = hwif->port_ops; 504 505 if (arg < 0 || arg > 255) 506 return -EINVAL; 507 508 if (port_ops == NULL || port_ops->set_pio_mode == NULL || 509 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) 510 return -ENOSYS; 511 512 if (drive->special.b.set_tune) 513 return -EBUSY; 514 515 ide_init_drive_cmd(&rq); 516 rq.cmd_type = REQ_TYPE_ATA_TASKFILE; 517 518 drive->tune_req = (u8) arg; 519 drive->special.b.set_tune = 1; 520 (void) ide_do_drive_cmd(drive, &rq, ide_wait); 521 return 0; 522} 523 524static int set_unmaskirq(ide_drive_t *drive, int arg) 525{ 526 if (drive->no_unmask) 527 return -EPERM; 528 529 if (arg < 0 || arg > 1) 530 return -EINVAL; 531 532 if (ide_spin_wait_hwgroup(drive)) 533 return -EBUSY; 534 drive->unmask = arg; 535 spin_unlock_irq(&ide_lock); 536 537 return 0; 538} 539 540/** 541 * system_bus_clock - clock guess 542 * 543 * External version of the bus clock guess used by very old IDE drivers 544 * for things like VLB timings. Should not be used. 545 */ 546 547int system_bus_clock (void) 548{ 549 return system_bus_speed; 550} 551 552EXPORT_SYMBOL(system_bus_clock); 553 554static int generic_ide_suspend(struct device *dev, pm_message_t mesg) 555{ 556 ide_drive_t *drive = dev->driver_data; 557 ide_hwif_t *hwif = HWIF(drive); 558 struct request rq; 559 struct request_pm_state rqpm; 560 ide_task_t args; 561 int ret; 562 563 /* Call ACPI _GTM only once */ 564 if (!(drive->dn % 2)) 565 ide_acpi_get_timing(hwif); 566 567 memset(&rq, 0, sizeof(rq)); 568 memset(&rqpm, 0, sizeof(rqpm)); 569 memset(&args, 0, sizeof(args)); 570 rq.cmd_type = REQ_TYPE_PM_SUSPEND; 571 rq.special = &args; 572 rq.data = &rqpm; 573 rqpm.pm_step = ide_pm_state_start_suspend; 574 if (mesg.event == PM_EVENT_PRETHAW) 575 mesg.event = PM_EVENT_FREEZE; 576 rqpm.pm_state = mesg.event; 577 578 ret = ide_do_drive_cmd(drive, &rq, ide_wait); 579 /* only call ACPI _PS3 after both drivers are suspended */ 580 if (!ret && (((drive->dn % 2) && hwif->drives[0].present 581 && hwif->drives[1].present) 582 || !hwif->drives[0].present 583 || !hwif->drives[1].present)) 584 ide_acpi_set_state(hwif, 0); 585 return ret; 586} 587 588static int generic_ide_resume(struct device *dev) 589{ 590 ide_drive_t *drive = dev->driver_data; 591 ide_hwif_t *hwif = HWIF(drive); 592 struct request rq; 593 struct request_pm_state rqpm; 594 ide_task_t args; 595 int err; 596 597 /* Call ACPI _STM only once */ 598 if (!(drive->dn % 2)) { 599 ide_acpi_set_state(hwif, 1); 600 ide_acpi_push_timing(hwif); 601 } 602 603 ide_acpi_exec_tfs(drive); 604 605 memset(&rq, 0, sizeof(rq)); 606 memset(&rqpm, 0, sizeof(rqpm)); 607 memset(&args, 0, sizeof(args)); 608 rq.cmd_type = REQ_TYPE_PM_RESUME; 609 rq.special = &args; 610 rq.data = &rqpm; 611 rqpm.pm_step = ide_pm_state_start_resume; 612 rqpm.pm_state = PM_EVENT_ON; 613 614 err = ide_do_drive_cmd(drive, &rq, ide_head_wait); 615 616 if (err == 0 && dev->driver) { 617 ide_driver_t *drv = to_ide_driver(dev->driver); 618 619 if (drv->resume) 620 drv->resume(drive); 621 } 622 623 return err; 624} 625 626int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev, 627 unsigned int cmd, unsigned long arg) 628{ 629 unsigned long flags; 630 ide_driver_t *drv; 631 void __user *p = (void __user *)arg; 632 int err = 0, (*setfunc)(ide_drive_t *, int); 633 u8 *val; 634 635 switch (cmd) { 636 case HDIO_GET_32BIT: val = &drive->io_32bit; goto read_val; 637 case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val; 638 case HDIO_GET_UNMASKINTR: val = &drive->unmask; goto read_val; 639 case HDIO_GET_DMA: val = &drive->using_dma; goto read_val; 640 case HDIO_SET_32BIT: setfunc = set_io_32bit; goto set_val; 641 case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings; goto set_val; 642 case HDIO_SET_PIO_MODE: setfunc = set_pio_mode; goto set_val; 643 case HDIO_SET_UNMASKINTR: setfunc = set_unmaskirq; goto set_val; 644 case HDIO_SET_DMA: setfunc = set_using_dma; goto set_val; 645 } 646 647 switch (cmd) { 648 case HDIO_OBSOLETE_IDENTITY: 649 case HDIO_GET_IDENTITY: 650 if (bdev != bdev->bd_contains) 651 return -EINVAL; 652 if (drive->id_read == 0) 653 return -ENOMSG; 654 if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142)) 655 return -EFAULT; 656 return 0; 657 658 case HDIO_GET_NICE: 659 return put_user(drive->dsc_overlap << IDE_NICE_DSC_OVERLAP | 660 drive->atapi_overlap << IDE_NICE_ATAPI_OVERLAP | 661 drive->nice1 << IDE_NICE_1, 662 (long __user *) arg); 663#ifdef CONFIG_IDE_TASK_IOCTL 664 case HDIO_DRIVE_TASKFILE: 665 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 666 return -EACCES; 667 switch(drive->media) { 668 case ide_disk: 669 return ide_taskfile_ioctl(drive, cmd, arg); 670 default: 671 return -ENOMSG; 672 } 673#endif /* CONFIG_IDE_TASK_IOCTL */ 674 675 case HDIO_DRIVE_CMD: 676 if (!capable(CAP_SYS_RAWIO)) 677 return -EACCES; 678 return ide_cmd_ioctl(drive, cmd, arg); 679 680 case HDIO_DRIVE_TASK: 681 if (!capable(CAP_SYS_RAWIO)) 682 return -EACCES; 683 return ide_task_ioctl(drive, cmd, arg); 684 case HDIO_SET_NICE: 685 if (!capable(CAP_SYS_ADMIN)) return -EACCES; 686 if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1)))) 687 return -EPERM; 688 drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1; 689 drv = *(ide_driver_t **)bdev->bd_disk->private_data; 690 if (drive->dsc_overlap && !drv->supports_dsc_overlap) { 691 drive->dsc_overlap = 0; 692 return -EPERM; 693 } 694 drive->nice1 = (arg >> IDE_NICE_1) & 1; 695 return 0; 696 case HDIO_DRIVE_RESET: 697 if (!capable(CAP_SYS_ADMIN)) 698 return -EACCES; 699 700 /* 701 * Abort the current command on the 702 * group if there is one, taking 703 * care not to allow anything else 704 * to be queued and to die on the 705 * spot if we miss one somehow 706 */ 707 708 spin_lock_irqsave(&ide_lock, flags); 709 710 if (HWGROUP(drive)->resetting) { 711 spin_unlock_irqrestore(&ide_lock, flags); 712 return -EBUSY; 713 } 714 715 ide_abort(drive, "drive reset"); 716 717 BUG_ON(HWGROUP(drive)->handler); 718 719 /* Ensure nothing gets queued after we 720 drop the lock. Reset will clear the busy */ 721 722 HWGROUP(drive)->busy = 1; 723 spin_unlock_irqrestore(&ide_lock, flags); 724 (void) ide_do_reset(drive); 725 726 return 0; 727 case HDIO_GET_BUSSTATE: 728 if (!capable(CAP_SYS_ADMIN)) 729 return -EACCES; 730 if (put_user(HWIF(drive)->bus_state, (long __user *)arg)) 731 return -EFAULT; 732 return 0; 733 734 case HDIO_SET_BUSSTATE: 735 if (!capable(CAP_SYS_ADMIN)) 736 return -EACCES; 737 return -EOPNOTSUPP; 738 default: 739 return -EINVAL; 740 } 741 742read_val: 743 mutex_lock(&ide_setting_mtx); 744 spin_lock_irqsave(&ide_lock, flags); 745 err = *val; 746 spin_unlock_irqrestore(&ide_lock, flags); 747 mutex_unlock(&ide_setting_mtx); 748 return err >= 0 ? put_user(err, (long __user *)arg) : err; 749 750set_val: 751 if (bdev != bdev->bd_contains) 752 err = -EINVAL; 753 else { 754 if (!capable(CAP_SYS_ADMIN)) 755 err = -EACCES; 756 else { 757 mutex_lock(&ide_setting_mtx); 758 err = setfunc(drive, arg); 759 mutex_unlock(&ide_setting_mtx); 760 } 761 } 762 return err; 763} 764 765EXPORT_SYMBOL(generic_ide_ioctl); 766 767/* 768 * stridx() returns the offset of c within s, 769 * or -1 if c is '\0' or not found within s. 770 */ 771static int __init stridx (const char *s, char c) 772{ 773 char *i = strchr(s, c); 774 return (i && c) ? i - s : -1; 775} 776 777/* 778 * match_parm() does parsing for ide_setup(): 779 * 780 * 1. the first char of s must be '='. 781 * 2. if the remainder matches one of the supplied keywords, 782 * the index (1 based) of the keyword is negated and returned. 783 * 3. if the remainder is a series of no more than max_vals numbers 784 * separated by commas, the numbers are saved in vals[] and a 785 * count of how many were saved is returned. Base10 is assumed, 786 * and base16 is allowed when prefixed with "0x". 787 * 4. otherwise, zero is returned. 788 */ 789static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals) 790{ 791 static const char *decimal = "0123456789"; 792 static const char *hex = "0123456789abcdef"; 793 int i, n; 794 795 if (*s++ == '=') { 796 /* 797 * Try matching against the supplied keywords, 798 * and return -(index+1) if we match one 799 */ 800 if (keywords != NULL) { 801 for (i = 0; *keywords != NULL; ++i) { 802 if (!strcmp(s, *keywords++)) 803 return -(i+1); 804 } 805 } 806 /* 807 * Look for a series of no more than "max_vals" 808 * numeric values separated by commas, in base10, 809 * or base16 when prefixed with "0x". 810 * Return a count of how many were found. 811 */ 812 for (n = 0; (i = stridx(decimal, *s)) >= 0;) { 813 vals[n] = i; 814 while ((i = stridx(decimal, *++s)) >= 0) 815 vals[n] = (vals[n] * 10) + i; 816 if (*s == 'x' && !vals[n]) { 817 while ((i = stridx(hex, *++s)) >= 0) 818 vals[n] = (vals[n] * 0x10) + i; 819 } 820 if (++n == max_vals) 821 break; 822 if (*s == ',' || *s == ';') 823 ++s; 824 } 825 if (!*s) 826 return n; 827 } 828 return 0; /* zero = nothing matched */ 829} 830 831/* 832 * ide_setup() gets called VERY EARLY during initialization, 833 * to handle kernel "command line" strings beginning with "hdx=" or "ide". 834 * 835 * Remember to update Documentation/ide/ide.txt if you change something here. 836 */ 837static int __init ide_setup(char *s) 838{ 839 ide_hwif_t *hwif; 840 ide_drive_t *drive; 841 unsigned int hw, unit; 842 int vals[3]; 843 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1); 844 845 if (strncmp(s,"hd",2) == 0 && s[2] == '=') /* hd= is for hd.c */ 846 return 0; /* driver and not us */ 847 848 if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2)) 849 return 0; 850 851 printk(KERN_INFO "ide_setup: %s", s); 852 init_ide_data (); 853 854#ifdef CONFIG_BLK_DEV_IDEDOUBLER 855 if (!strcmp(s, "ide=doubler")) { 856 extern int ide_doubler; 857 858 printk(" : Enabled support for IDE doublers\n"); 859 ide_doubler = 1; 860 goto obsolete_option; 861 } 862#endif /* CONFIG_BLK_DEV_IDEDOUBLER */ 863 864 if (!strcmp(s, "ide=nodma")) { 865 printk(" : Prevented DMA\n"); 866 noautodma = 1; 867 goto obsolete_option; 868 } 869 870#ifdef CONFIG_BLK_DEV_IDEACPI 871 if (!strcmp(s, "ide=noacpi")) { 872 //printk(" : Disable IDE ACPI support.\n"); 873 ide_noacpi = 1; 874 goto obsolete_option; 875 } 876 if (!strcmp(s, "ide=acpigtf")) { 877 //printk(" : Enable IDE ACPI _GTF support.\n"); 878 ide_acpigtf = 1; 879 goto obsolete_option; 880 } 881 if (!strcmp(s, "ide=acpionboot")) { 882 //printk(" : Call IDE ACPI methods on boot.\n"); 883 ide_acpionboot = 1; 884 goto obsolete_option; 885 } 886#endif /* CONFIG_BLK_DEV_IDEACPI */ 887 888 /* 889 * Look for drive options: "hdx=" 890 */ 891 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) { 892 const char *hd_words[] = { 893 "none", "noprobe", "nowerr", "cdrom", "nodma", 894 "-6", "-7", "-8", "-9", "-10", 895 "noflush", "remap", "remap63", "scsi", NULL }; 896 unit = s[2] - 'a'; 897 hw = unit / MAX_DRIVES; 898 unit = unit % MAX_DRIVES; 899 hwif = &ide_hwifs[hw]; 900 drive = &hwif->drives[unit]; 901 if (strncmp(s + 4, "ide-", 4) == 0) { 902 strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req)); 903 goto obsolete_option; 904 } 905 switch (match_parm(&s[3], hd_words, vals, 3)) { 906 case -1: /* "none" */ 907 case -2: /* "noprobe" */ 908 drive->noprobe = 1; 909 goto obsolete_option; 910 case -3: /* "nowerr" */ 911 drive->bad_wstat = BAD_R_STAT; 912 goto obsolete_option; 913 case -4: /* "cdrom" */ 914 drive->present = 1; 915 drive->media = ide_cdrom; 916 /* an ATAPI device ignores DRDY */ 917 drive->ready_stat = 0; 918 goto obsolete_option; 919 case -5: /* nodma */ 920 drive->nodma = 1; 921 goto obsolete_option; 922 case -11: /* noflush */ 923 drive->noflush = 1; 924 goto obsolete_option; 925 case -12: /* "remap" */ 926 drive->remap_0_to_1 = 1; 927 goto obsolete_option; 928 case -13: /* "remap63" */ 929 drive->sect0 = 63; 930 goto obsolete_option; 931 case -14: /* "scsi" */ 932 drive->scsi = 1; 933 goto obsolete_option; 934 case 3: /* cyl,head,sect */ 935 drive->media = ide_disk; 936 drive->ready_stat = READY_STAT; 937 drive->cyl = drive->bios_cyl = vals[0]; 938 drive->head = drive->bios_head = vals[1]; 939 drive->sect = drive->bios_sect = vals[2]; 940 drive->present = 1; 941 drive->forced_geom = 1; 942 goto obsolete_option; 943 default: 944 goto bad_option; 945 } 946 } 947 948 if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e') 949 goto bad_option; 950 /* 951 * Look for bus speed option: "idebus=" 952 */ 953 if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') { 954 if (match_parm(&s[6], NULL, vals, 1) != 1) 955 goto bad_option; 956 if (vals[0] >= 20 && vals[0] <= 66) { 957 idebus_parameter = vals[0]; 958 } else 959 printk(" -- BAD BUS SPEED! Expected value from 20 to 66"); 960 goto obsolete_option; 961 } 962 963bad_option: 964 printk(" -- BAD OPTION\n"); 965 return 1; 966obsolete_option: 967 printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n"); 968 return 1; 969} 970 971EXPORT_SYMBOL(ide_lock); 972 973static int ide_bus_match(struct device *dev, struct device_driver *drv) 974{ 975 return 1; 976} 977 978static char *media_string(ide_drive_t *drive) 979{ 980 switch (drive->media) { 981 case ide_disk: 982 return "disk"; 983 case ide_cdrom: 984 return "cdrom"; 985 case ide_tape: 986 return "tape"; 987 case ide_floppy: 988 return "floppy"; 989 case ide_optical: 990 return "optical"; 991 default: 992 return "UNKNOWN"; 993 } 994} 995 996static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf) 997{ 998 ide_drive_t *drive = to_ide_device(dev); 999 return sprintf(buf, "%s\n", media_string(drive)); 1000} 1001 1002static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf) 1003{ 1004 ide_drive_t *drive = to_ide_device(dev); 1005 return sprintf(buf, "%s\n", drive->name); 1006} 1007 1008static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) 1009{ 1010 ide_drive_t *drive = to_ide_device(dev); 1011 return sprintf(buf, "ide:m-%s\n", media_string(drive)); 1012} 1013 1014static ssize_t model_show(struct device *dev, struct device_attribute *attr, 1015 char *buf) 1016{ 1017 ide_drive_t *drive = to_ide_device(dev); 1018 return sprintf(buf, "%s\n", drive->id->model); 1019} 1020 1021static ssize_t firmware_show(struct device *dev, struct device_attribute *attr, 1022 char *buf) 1023{ 1024 ide_drive_t *drive = to_ide_device(dev); 1025 return sprintf(buf, "%s\n", drive->id->fw_rev); 1026} 1027 1028static ssize_t serial_show(struct device *dev, struct device_attribute *attr, 1029 char *buf) 1030{ 1031 ide_drive_t *drive = to_ide_device(dev); 1032 return sprintf(buf, "%s\n", drive->id->serial_no); 1033} 1034 1035static struct device_attribute ide_dev_attrs[] = { 1036 __ATTR_RO(media), 1037 __ATTR_RO(drivename), 1038 __ATTR_RO(modalias), 1039 __ATTR_RO(model), 1040 __ATTR_RO(firmware), 1041 __ATTR(serial, 0400, serial_show, NULL), 1042 __ATTR_NULL 1043}; 1044 1045static int ide_uevent(struct device *dev, struct kobj_uevent_env *env) 1046{ 1047 ide_drive_t *drive = to_ide_device(dev); 1048 1049 add_uevent_var(env, "MEDIA=%s", media_string(drive)); 1050 add_uevent_var(env, "DRIVENAME=%s", drive->name); 1051 add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive)); 1052 return 0; 1053} 1054 1055static int generic_ide_probe(struct device *dev) 1056{ 1057 ide_drive_t *drive = to_ide_device(dev); 1058 ide_driver_t *drv = to_ide_driver(dev->driver); 1059 1060 return drv->probe ? drv->probe(drive) : -ENODEV; 1061} 1062 1063static int generic_ide_remove(struct device *dev) 1064{ 1065 ide_drive_t *drive = to_ide_device(dev); 1066 ide_driver_t *drv = to_ide_driver(dev->driver); 1067 1068 if (drv->remove) 1069 drv->remove(drive); 1070 1071 return 0; 1072} 1073 1074static void generic_ide_shutdown(struct device *dev) 1075{ 1076 ide_drive_t *drive = to_ide_device(dev); 1077 ide_driver_t *drv = to_ide_driver(dev->driver); 1078 1079 if (dev->driver && drv->shutdown) 1080 drv->shutdown(drive); 1081} 1082 1083struct bus_type ide_bus_type = { 1084 .name = "ide", 1085 .match = ide_bus_match, 1086 .uevent = ide_uevent, 1087 .probe = generic_ide_probe, 1088 .remove = generic_ide_remove, 1089 .shutdown = generic_ide_shutdown, 1090 .dev_attrs = ide_dev_attrs, 1091 .suspend = generic_ide_suspend, 1092 .resume = generic_ide_resume, 1093}; 1094 1095EXPORT_SYMBOL_GPL(ide_bus_type); 1096 1097static void ide_port_class_release(struct device *portdev) 1098{ 1099 ide_hwif_t *hwif = dev_get_drvdata(portdev); 1100 1101 put_device(&hwif->gendev); 1102} 1103 1104int ide_vlb_clk; 1105EXPORT_SYMBOL_GPL(ide_vlb_clk); 1106 1107module_param_named(vlb_clock, ide_vlb_clk, int, 0); 1108MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)"); 1109 1110int ide_pci_clk; 1111EXPORT_SYMBOL_GPL(ide_pci_clk); 1112 1113module_param_named(pci_clock, ide_pci_clk, int, 0); 1114MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)"); 1115 1116static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp) 1117{ 1118 int a, b, i, j = 1; 1119 unsigned int *dev_param_mask = (unsigned int *)kp->arg; 1120 1121 if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 && 1122 sscanf(s, "%d.%d", &a, &b) != 2) 1123 return -EINVAL; 1124 1125 i = a * MAX_DRIVES + b; 1126 1127 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 1128 return -EINVAL; 1129 1130 if (j) 1131 *dev_param_mask |= (1 << i); 1132 else 1133 *dev_param_mask &= (1 << i); 1134 1135 return 0; 1136} 1137 1138static unsigned int ide_nodma; 1139 1140module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0); 1141MODULE_PARM_DESC(nodma, "disallow DMA for a device"); 1142 1143static unsigned int ide_noflush; 1144 1145module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0); 1146MODULE_PARM_DESC(noflush, "disable flush requests for a device"); 1147 1148static unsigned int ide_noprobe; 1149 1150module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0); 1151MODULE_PARM_DESC(noprobe, "skip probing for a device"); 1152 1153static unsigned int ide_nowerr; 1154 1155module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0); 1156MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device"); 1157 1158static unsigned int ide_cdroms; 1159 1160module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0); 1161MODULE_PARM_DESC(cdrom, "force device as a CD-ROM"); 1162 1163struct chs_geom { 1164 unsigned int cyl; 1165 u8 head; 1166 u8 sect; 1167}; 1168 1169static unsigned int ide_disks; 1170static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES]; 1171 1172static int ide_set_disk_chs(const char *str, struct kernel_param *kp) 1173{ 1174 int a, b, c = 0, h = 0, s = 0, i, j = 1; 1175 1176 if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 && 1177 sscanf(str, "%d.%d:%d", &a, &b, &j) != 3) 1178 return -EINVAL; 1179 1180 i = a * MAX_DRIVES + b; 1181 1182 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 1183 return -EINVAL; 1184 1185 if (c > INT_MAX || h > 255 || s > 255) 1186 return -EINVAL; 1187 1188 if (j) 1189 ide_disks |= (1 << i); 1190 else 1191 ide_disks &= (1 << i); 1192 1193 ide_disks_chs[i].cyl = c; 1194 ide_disks_chs[i].head = h; 1195 ide_disks_chs[i].sect = s; 1196 1197 return 0; 1198} 1199 1200module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0); 1201MODULE_PARM_DESC(chs, "force device as a disk (using CHS)"); 1202 1203static void ide_dev_apply_params(ide_drive_t *drive) 1204{ 1205 int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit; 1206 1207 if (ide_nodma & (1 << i)) { 1208 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name); 1209 drive->nodma = 1; 1210 } 1211 if (ide_noflush & (1 << i)) { 1212 printk(KERN_INFO "ide: disabling flush requests for %s\n", 1213 drive->name); 1214 drive->noflush = 1; 1215 } 1216 if (ide_noprobe & (1 << i)) { 1217 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name); 1218 drive->noprobe = 1; 1219 } 1220 if (ide_nowerr & (1 << i)) { 1221 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n", 1222 drive->name); 1223 drive->bad_wstat = BAD_R_STAT; 1224 } 1225 if (ide_cdroms & (1 << i)) { 1226 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name); 1227 drive->present = 1; 1228 drive->media = ide_cdrom; 1229 /* an ATAPI device ignores DRDY */ 1230 drive->ready_stat = 0; 1231 } 1232 if (ide_disks & (1 << i)) { 1233 drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl; 1234 drive->head = drive->bios_head = ide_disks_chs[i].head; 1235 drive->sect = drive->bios_sect = ide_disks_chs[i].sect; 1236 drive->forced_geom = 1; 1237 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n", 1238 drive->name, 1239 drive->cyl, drive->head, drive->sect); 1240 drive->present = 1; 1241 drive->media = ide_disk; 1242 drive->ready_stat = READY_STAT; 1243 } 1244} 1245 1246static unsigned int ide_ignore_cable; 1247 1248static int ide_set_ignore_cable(const char *s, struct kernel_param *kp) 1249{ 1250 int i, j = 1; 1251 1252 if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1) 1253 return -EINVAL; 1254 1255 if (i >= MAX_HWIFS || j < 0 || j > 1) 1256 return -EINVAL; 1257 1258 if (j) 1259 ide_ignore_cable |= (1 << i); 1260 else 1261 ide_ignore_cable &= (1 << i); 1262 1263 return 0; 1264} 1265 1266module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0); 1267MODULE_PARM_DESC(ignore_cable, "ignore cable detection"); 1268 1269void ide_port_apply_params(ide_hwif_t *hwif) 1270{ 1271 int i; 1272 1273 if (ide_ignore_cable & (1 << hwif->index)) { 1274 printk(KERN_INFO "ide: ignoring cable detection for %s\n", 1275 hwif->name); 1276 hwif->cbl = ATA_CBL_PATA40_SHORT; 1277 } 1278 1279 for (i = 0; i < MAX_DRIVES; i++) 1280 ide_dev_apply_params(&hwif->drives[i]); 1281} 1282 1283/* 1284 * This is gets invoked once during initialization, to set *everything* up 1285 */ 1286static int __init ide_init(void) 1287{ 1288 int ret; 1289 1290 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n"); 1291 system_bus_speed = ide_system_bus_speed(); 1292 1293 printk(KERN_INFO "ide: Assuming %dMHz system bus speed " 1294 "for PIO modes%s\n", system_bus_speed, 1295 idebus_parameter ? "" : "; override with idebus=xx"); 1296 1297 ret = bus_register(&ide_bus_type); 1298 if (ret < 0) { 1299 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret); 1300 return ret; 1301 } 1302 1303 ide_port_class = class_create(THIS_MODULE, "ide_port"); 1304 if (IS_ERR(ide_port_class)) { 1305 ret = PTR_ERR(ide_port_class); 1306 goto out_port_class; 1307 } 1308 ide_port_class->dev_release = ide_port_class_release; 1309 1310 init_ide_data(); 1311 1312 proc_ide_create(); 1313 1314 return 0; 1315 1316out_port_class: 1317 bus_unregister(&ide_bus_type); 1318 1319 return ret; 1320} 1321 1322#ifdef MODULE 1323static char *options = NULL; 1324module_param(options, charp, 0); 1325MODULE_LICENSE("GPL"); 1326 1327static void __init parse_options (char *line) 1328{ 1329 char *next = line; 1330 1331 if (line == NULL || !*line) 1332 return; 1333 while ((line = next) != NULL) { 1334 if ((next = strchr(line,' ')) != NULL) 1335 *next++ = 0; 1336 if (!ide_setup(line)) 1337 printk (KERN_INFO "Unknown option '%s'\n", line); 1338 } 1339} 1340 1341int __init init_module (void) 1342{ 1343 parse_options(options); 1344 return ide_init(); 1345} 1346 1347void __exit cleanup_module (void) 1348{ 1349 proc_ide_destroy(); 1350 1351 class_destroy(ide_port_class); 1352 1353 bus_unregister(&ide_bus_type); 1354} 1355 1356#else /* !MODULE */ 1357 1358__setup("", ide_setup); 1359 1360module_init(ide_init); 1361 1362#endif /* MODULE */ 1363