ide.c revision bf64b7a9ddc604883a1f41535d3d7a62bca9ee81
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 * @index: index of interface (will change soon to a pointer) 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(unsigned int index) 311{ 312 ide_hwif_t *hwif, *g; 313 ide_hwgroup_t *hwgroup; 314 int irq_count = 0; 315 316 BUG_ON(index >= MAX_HWIFS); 317 318 BUG_ON(in_interrupt()); 319 BUG_ON(irqs_disabled()); 320 mutex_lock(&ide_cfg_mtx); 321 spin_lock_irq(&ide_lock); 322 hwif = &ide_hwifs[index]; 323 if (!hwif->present) 324 goto abort; 325 __ide_port_unregister_devices(hwif); 326 hwif->present = 0; 327 328 spin_unlock_irq(&ide_lock); 329 330 ide_proc_unregister_port(hwif); 331 332 hwgroup = hwif->hwgroup; 333 /* 334 * free the irq if we were the only hwif using it 335 */ 336 g = hwgroup->hwif; 337 do { 338 if (g->irq == hwif->irq) 339 ++irq_count; 340 g = g->next; 341 } while (g != hwgroup->hwif); 342 if (irq_count == 1) 343 free_irq(hwif->irq, hwgroup); 344 345 ide_remove_port_from_hwgroup(hwif); 346 347 device_unregister(hwif->portdev); 348 device_unregister(&hwif->gendev); 349 wait_for_completion(&hwif->gendev_rel_comp); 350 351 /* 352 * Remove us from the kernel's knowledge 353 */ 354 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS); 355 kfree(hwif->sg_table); 356 unregister_blkdev(hwif->major, hwif->name); 357 spin_lock_irq(&ide_lock); 358 359 if (hwif->dma_base) 360 ide_release_dma_engine(hwif); 361 362 /* restore hwif data to pristine status */ 363 ide_init_port_data(hwif, index); 364 365abort: 366 spin_unlock_irq(&ide_lock); 367 mutex_unlock(&ide_cfg_mtx); 368} 369 370EXPORT_SYMBOL(ide_unregister); 371 372void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw) 373{ 374 memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports)); 375 hwif->irq = hw->irq; 376 hwif->chipset = hw->chipset; 377 hwif->gendev.parent = hw->dev; 378 hwif->ack_intr = hw->ack_intr; 379} 380EXPORT_SYMBOL_GPL(ide_init_port_hw); 381 382/* 383 * Locks for IDE setting functionality 384 */ 385 386DEFINE_MUTEX(ide_setting_mtx); 387 388EXPORT_SYMBOL_GPL(ide_setting_mtx); 389 390/** 391 * ide_spin_wait_hwgroup - wait for group 392 * @drive: drive in the group 393 * 394 * Wait for an IDE device group to go non busy and then return 395 * holding the ide_lock which guards the hwgroup->busy status 396 * and right to use it. 397 */ 398 399int ide_spin_wait_hwgroup (ide_drive_t *drive) 400{ 401 ide_hwgroup_t *hwgroup = HWGROUP(drive); 402 unsigned long timeout = jiffies + (3 * HZ); 403 404 spin_lock_irq(&ide_lock); 405 406 while (hwgroup->busy) { 407 unsigned long lflags; 408 spin_unlock_irq(&ide_lock); 409 local_irq_set(lflags); 410 if (time_after(jiffies, timeout)) { 411 local_irq_restore(lflags); 412 printk(KERN_ERR "%s: channel busy\n", drive->name); 413 return -EBUSY; 414 } 415 local_irq_restore(lflags); 416 spin_lock_irq(&ide_lock); 417 } 418 return 0; 419} 420 421EXPORT_SYMBOL(ide_spin_wait_hwgroup); 422 423int set_io_32bit(ide_drive_t *drive, int arg) 424{ 425 if (drive->no_io_32bit) 426 return -EPERM; 427 428 if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1)) 429 return -EINVAL; 430 431 if (ide_spin_wait_hwgroup(drive)) 432 return -EBUSY; 433 434 drive->io_32bit = arg; 435 436 spin_unlock_irq(&ide_lock); 437 438 return 0; 439} 440 441static int set_ksettings(ide_drive_t *drive, int arg) 442{ 443 if (arg < 0 || arg > 1) 444 return -EINVAL; 445 446 if (ide_spin_wait_hwgroup(drive)) 447 return -EBUSY; 448 drive->keep_settings = arg; 449 spin_unlock_irq(&ide_lock); 450 451 return 0; 452} 453 454int set_using_dma(ide_drive_t *drive, int arg) 455{ 456#ifdef CONFIG_BLK_DEV_IDEDMA 457 ide_hwif_t *hwif = drive->hwif; 458 int err = -EPERM; 459 460 if (arg < 0 || arg > 1) 461 return -EINVAL; 462 463 if (!drive->id || !(drive->id->capability & 1)) 464 goto out; 465 466 if (hwif->dma_ops == NULL) 467 goto out; 468 469 err = -EBUSY; 470 if (ide_spin_wait_hwgroup(drive)) 471 goto out; 472 /* 473 * set ->busy flag, unlock and let it ride 474 */ 475 hwif->hwgroup->busy = 1; 476 spin_unlock_irq(&ide_lock); 477 478 err = 0; 479 480 if (arg) { 481 if (ide_set_dma(drive)) 482 err = -EIO; 483 } else 484 ide_dma_off(drive); 485 486 /* 487 * lock, clear ->busy flag and unlock before leaving 488 */ 489 spin_lock_irq(&ide_lock); 490 hwif->hwgroup->busy = 0; 491 spin_unlock_irq(&ide_lock); 492out: 493 return err; 494#else 495 if (arg < 0 || arg > 1) 496 return -EINVAL; 497 498 return -EPERM; 499#endif 500} 501 502int set_pio_mode(ide_drive_t *drive, int arg) 503{ 504 struct request rq; 505 ide_hwif_t *hwif = drive->hwif; 506 const struct ide_port_ops *port_ops = hwif->port_ops; 507 508 if (arg < 0 || arg > 255) 509 return -EINVAL; 510 511 if (port_ops == NULL || port_ops->set_pio_mode == NULL || 512 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) 513 return -ENOSYS; 514 515 if (drive->special.b.set_tune) 516 return -EBUSY; 517 518 ide_init_drive_cmd(&rq); 519 rq.cmd_type = REQ_TYPE_ATA_TASKFILE; 520 521 drive->tune_req = (u8) arg; 522 drive->special.b.set_tune = 1; 523 (void) ide_do_drive_cmd(drive, &rq, ide_wait); 524 return 0; 525} 526 527static int set_unmaskirq(ide_drive_t *drive, int arg) 528{ 529 if (drive->no_unmask) 530 return -EPERM; 531 532 if (arg < 0 || arg > 1) 533 return -EINVAL; 534 535 if (ide_spin_wait_hwgroup(drive)) 536 return -EBUSY; 537 drive->unmask = arg; 538 spin_unlock_irq(&ide_lock); 539 540 return 0; 541} 542 543/** 544 * system_bus_clock - clock guess 545 * 546 * External version of the bus clock guess used by very old IDE drivers 547 * for things like VLB timings. Should not be used. 548 */ 549 550int system_bus_clock (void) 551{ 552 return system_bus_speed; 553} 554 555EXPORT_SYMBOL(system_bus_clock); 556 557static int generic_ide_suspend(struct device *dev, pm_message_t mesg) 558{ 559 ide_drive_t *drive = dev->driver_data; 560 ide_hwif_t *hwif = HWIF(drive); 561 struct request rq; 562 struct request_pm_state rqpm; 563 ide_task_t args; 564 int ret; 565 566 /* Call ACPI _GTM only once */ 567 if (!(drive->dn % 2)) 568 ide_acpi_get_timing(hwif); 569 570 memset(&rq, 0, sizeof(rq)); 571 memset(&rqpm, 0, sizeof(rqpm)); 572 memset(&args, 0, sizeof(args)); 573 rq.cmd_type = REQ_TYPE_PM_SUSPEND; 574 rq.special = &args; 575 rq.data = &rqpm; 576 rqpm.pm_step = ide_pm_state_start_suspend; 577 if (mesg.event == PM_EVENT_PRETHAW) 578 mesg.event = PM_EVENT_FREEZE; 579 rqpm.pm_state = mesg.event; 580 581 ret = ide_do_drive_cmd(drive, &rq, ide_wait); 582 /* only call ACPI _PS3 after both drivers are suspended */ 583 if (!ret && (((drive->dn % 2) && hwif->drives[0].present 584 && hwif->drives[1].present) 585 || !hwif->drives[0].present 586 || !hwif->drives[1].present)) 587 ide_acpi_set_state(hwif, 0); 588 return ret; 589} 590 591static int generic_ide_resume(struct device *dev) 592{ 593 ide_drive_t *drive = dev->driver_data; 594 ide_hwif_t *hwif = HWIF(drive); 595 struct request rq; 596 struct request_pm_state rqpm; 597 ide_task_t args; 598 int err; 599 600 /* Call ACPI _STM only once */ 601 if (!(drive->dn % 2)) { 602 ide_acpi_set_state(hwif, 1); 603 ide_acpi_push_timing(hwif); 604 } 605 606 ide_acpi_exec_tfs(drive); 607 608 memset(&rq, 0, sizeof(rq)); 609 memset(&rqpm, 0, sizeof(rqpm)); 610 memset(&args, 0, sizeof(args)); 611 rq.cmd_type = REQ_TYPE_PM_RESUME; 612 rq.special = &args; 613 rq.data = &rqpm; 614 rqpm.pm_step = ide_pm_state_start_resume; 615 rqpm.pm_state = PM_EVENT_ON; 616 617 err = ide_do_drive_cmd(drive, &rq, ide_head_wait); 618 619 if (err == 0 && dev->driver) { 620 ide_driver_t *drv = to_ide_driver(dev->driver); 621 622 if (drv->resume) 623 drv->resume(drive); 624 } 625 626 return err; 627} 628 629int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev, 630 unsigned int cmd, unsigned long arg) 631{ 632 unsigned long flags; 633 ide_driver_t *drv; 634 void __user *p = (void __user *)arg; 635 int err = 0, (*setfunc)(ide_drive_t *, int); 636 u8 *val; 637 638 switch (cmd) { 639 case HDIO_GET_32BIT: val = &drive->io_32bit; goto read_val; 640 case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val; 641 case HDIO_GET_UNMASKINTR: val = &drive->unmask; goto read_val; 642 case HDIO_GET_DMA: val = &drive->using_dma; goto read_val; 643 case HDIO_SET_32BIT: setfunc = set_io_32bit; goto set_val; 644 case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings; goto set_val; 645 case HDIO_SET_PIO_MODE: setfunc = set_pio_mode; goto set_val; 646 case HDIO_SET_UNMASKINTR: setfunc = set_unmaskirq; goto set_val; 647 case HDIO_SET_DMA: setfunc = set_using_dma; goto set_val; 648 } 649 650 switch (cmd) { 651 case HDIO_OBSOLETE_IDENTITY: 652 case HDIO_GET_IDENTITY: 653 if (bdev != bdev->bd_contains) 654 return -EINVAL; 655 if (drive->id_read == 0) 656 return -ENOMSG; 657 if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142)) 658 return -EFAULT; 659 return 0; 660 661 case HDIO_GET_NICE: 662 return put_user(drive->dsc_overlap << IDE_NICE_DSC_OVERLAP | 663 drive->atapi_overlap << IDE_NICE_ATAPI_OVERLAP | 664 drive->nice1 << IDE_NICE_1, 665 (long __user *) arg); 666#ifdef CONFIG_IDE_TASK_IOCTL 667 case HDIO_DRIVE_TASKFILE: 668 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 669 return -EACCES; 670 switch(drive->media) { 671 case ide_disk: 672 return ide_taskfile_ioctl(drive, cmd, arg); 673 default: 674 return -ENOMSG; 675 } 676#endif /* CONFIG_IDE_TASK_IOCTL */ 677 678 case HDIO_DRIVE_CMD: 679 if (!capable(CAP_SYS_RAWIO)) 680 return -EACCES; 681 return ide_cmd_ioctl(drive, cmd, arg); 682 683 case HDIO_DRIVE_TASK: 684 if (!capable(CAP_SYS_RAWIO)) 685 return -EACCES; 686 return ide_task_ioctl(drive, cmd, arg); 687 case HDIO_SET_NICE: 688 if (!capable(CAP_SYS_ADMIN)) return -EACCES; 689 if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1)))) 690 return -EPERM; 691 drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1; 692 drv = *(ide_driver_t **)bdev->bd_disk->private_data; 693 if (drive->dsc_overlap && !drv->supports_dsc_overlap) { 694 drive->dsc_overlap = 0; 695 return -EPERM; 696 } 697 drive->nice1 = (arg >> IDE_NICE_1) & 1; 698 return 0; 699 case HDIO_DRIVE_RESET: 700 if (!capable(CAP_SYS_ADMIN)) 701 return -EACCES; 702 703 /* 704 * Abort the current command on the 705 * group if there is one, taking 706 * care not to allow anything else 707 * to be queued and to die on the 708 * spot if we miss one somehow 709 */ 710 711 spin_lock_irqsave(&ide_lock, flags); 712 713 if (HWGROUP(drive)->resetting) { 714 spin_unlock_irqrestore(&ide_lock, flags); 715 return -EBUSY; 716 } 717 718 ide_abort(drive, "drive reset"); 719 720 BUG_ON(HWGROUP(drive)->handler); 721 722 /* Ensure nothing gets queued after we 723 drop the lock. Reset will clear the busy */ 724 725 HWGROUP(drive)->busy = 1; 726 spin_unlock_irqrestore(&ide_lock, flags); 727 (void) ide_do_reset(drive); 728 729 return 0; 730 case HDIO_GET_BUSSTATE: 731 if (!capable(CAP_SYS_ADMIN)) 732 return -EACCES; 733 if (put_user(HWIF(drive)->bus_state, (long __user *)arg)) 734 return -EFAULT; 735 return 0; 736 737 case HDIO_SET_BUSSTATE: 738 if (!capable(CAP_SYS_ADMIN)) 739 return -EACCES; 740 return -EOPNOTSUPP; 741 default: 742 return -EINVAL; 743 } 744 745read_val: 746 mutex_lock(&ide_setting_mtx); 747 spin_lock_irqsave(&ide_lock, flags); 748 err = *val; 749 spin_unlock_irqrestore(&ide_lock, flags); 750 mutex_unlock(&ide_setting_mtx); 751 return err >= 0 ? put_user(err, (long __user *)arg) : err; 752 753set_val: 754 if (bdev != bdev->bd_contains) 755 err = -EINVAL; 756 else { 757 if (!capable(CAP_SYS_ADMIN)) 758 err = -EACCES; 759 else { 760 mutex_lock(&ide_setting_mtx); 761 err = setfunc(drive, arg); 762 mutex_unlock(&ide_setting_mtx); 763 } 764 } 765 return err; 766} 767 768EXPORT_SYMBOL(generic_ide_ioctl); 769 770/* 771 * stridx() returns the offset of c within s, 772 * or -1 if c is '\0' or not found within s. 773 */ 774static int __init stridx (const char *s, char c) 775{ 776 char *i = strchr(s, c); 777 return (i && c) ? i - s : -1; 778} 779 780/* 781 * match_parm() does parsing for ide_setup(): 782 * 783 * 1. the first char of s must be '='. 784 * 2. if the remainder matches one of the supplied keywords, 785 * the index (1 based) of the keyword is negated and returned. 786 * 3. if the remainder is a series of no more than max_vals numbers 787 * separated by commas, the numbers are saved in vals[] and a 788 * count of how many were saved is returned. Base10 is assumed, 789 * and base16 is allowed when prefixed with "0x". 790 * 4. otherwise, zero is returned. 791 */ 792static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals) 793{ 794 static const char *decimal = "0123456789"; 795 static const char *hex = "0123456789abcdef"; 796 int i, n; 797 798 if (*s++ == '=') { 799 /* 800 * Try matching against the supplied keywords, 801 * and return -(index+1) if we match one 802 */ 803 if (keywords != NULL) { 804 for (i = 0; *keywords != NULL; ++i) { 805 if (!strcmp(s, *keywords++)) 806 return -(i+1); 807 } 808 } 809 /* 810 * Look for a series of no more than "max_vals" 811 * numeric values separated by commas, in base10, 812 * or base16 when prefixed with "0x". 813 * Return a count of how many were found. 814 */ 815 for (n = 0; (i = stridx(decimal, *s)) >= 0;) { 816 vals[n] = i; 817 while ((i = stridx(decimal, *++s)) >= 0) 818 vals[n] = (vals[n] * 10) + i; 819 if (*s == 'x' && !vals[n]) { 820 while ((i = stridx(hex, *++s)) >= 0) 821 vals[n] = (vals[n] * 0x10) + i; 822 } 823 if (++n == max_vals) 824 break; 825 if (*s == ',' || *s == ';') 826 ++s; 827 } 828 if (!*s) 829 return n; 830 } 831 return 0; /* zero = nothing matched */ 832} 833 834/* 835 * ide_setup() gets called VERY EARLY during initialization, 836 * to handle kernel "command line" strings beginning with "hdx=" or "ide". 837 * 838 * Remember to update Documentation/ide/ide.txt if you change something here. 839 */ 840static int __init ide_setup(char *s) 841{ 842 ide_hwif_t *hwif; 843 ide_drive_t *drive; 844 unsigned int hw, unit; 845 int vals[3]; 846 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1); 847 848 if (strncmp(s,"hd",2) == 0 && s[2] == '=') /* hd= is for hd.c */ 849 return 0; /* driver and not us */ 850 851 if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2)) 852 return 0; 853 854 printk(KERN_INFO "ide_setup: %s", s); 855 init_ide_data (); 856 857#ifdef CONFIG_BLK_DEV_IDEDOUBLER 858 if (!strcmp(s, "ide=doubler")) { 859 extern int ide_doubler; 860 861 printk(" : Enabled support for IDE doublers\n"); 862 ide_doubler = 1; 863 goto obsolete_option; 864 } 865#endif /* CONFIG_BLK_DEV_IDEDOUBLER */ 866 867 if (!strcmp(s, "ide=nodma")) { 868 printk(" : Prevented DMA\n"); 869 noautodma = 1; 870 goto obsolete_option; 871 } 872 873#ifdef CONFIG_BLK_DEV_IDEACPI 874 if (!strcmp(s, "ide=noacpi")) { 875 //printk(" : Disable IDE ACPI support.\n"); 876 ide_noacpi = 1; 877 goto obsolete_option; 878 } 879 if (!strcmp(s, "ide=acpigtf")) { 880 //printk(" : Enable IDE ACPI _GTF support.\n"); 881 ide_acpigtf = 1; 882 goto obsolete_option; 883 } 884 if (!strcmp(s, "ide=acpionboot")) { 885 //printk(" : Call IDE ACPI methods on boot.\n"); 886 ide_acpionboot = 1; 887 goto obsolete_option; 888 } 889#endif /* CONFIG_BLK_DEV_IDEACPI */ 890 891 /* 892 * Look for drive options: "hdx=" 893 */ 894 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) { 895 const char *hd_words[] = { 896 "none", "noprobe", "nowerr", "cdrom", "nodma", 897 "-6", "-7", "-8", "-9", "-10", 898 "noflush", "remap", "remap63", "scsi", NULL }; 899 unit = s[2] - 'a'; 900 hw = unit / MAX_DRIVES; 901 unit = unit % MAX_DRIVES; 902 hwif = &ide_hwifs[hw]; 903 drive = &hwif->drives[unit]; 904 if (strncmp(s + 4, "ide-", 4) == 0) { 905 strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req)); 906 goto obsolete_option; 907 } 908 switch (match_parm(&s[3], hd_words, vals, 3)) { 909 case -1: /* "none" */ 910 case -2: /* "noprobe" */ 911 drive->noprobe = 1; 912 goto obsolete_option; 913 case -3: /* "nowerr" */ 914 drive->bad_wstat = BAD_R_STAT; 915 goto obsolete_option; 916 case -4: /* "cdrom" */ 917 drive->present = 1; 918 drive->media = ide_cdrom; 919 /* an ATAPI device ignores DRDY */ 920 drive->ready_stat = 0; 921 goto obsolete_option; 922 case -5: /* nodma */ 923 drive->nodma = 1; 924 goto obsolete_option; 925 case -11: /* noflush */ 926 drive->noflush = 1; 927 goto obsolete_option; 928 case -12: /* "remap" */ 929 drive->remap_0_to_1 = 1; 930 goto obsolete_option; 931 case -13: /* "remap63" */ 932 drive->sect0 = 63; 933 goto obsolete_option; 934 case -14: /* "scsi" */ 935 drive->scsi = 1; 936 goto obsolete_option; 937 case 3: /* cyl,head,sect */ 938 drive->media = ide_disk; 939 drive->ready_stat = READY_STAT; 940 drive->cyl = drive->bios_cyl = vals[0]; 941 drive->head = drive->bios_head = vals[1]; 942 drive->sect = drive->bios_sect = vals[2]; 943 drive->present = 1; 944 drive->forced_geom = 1; 945 goto obsolete_option; 946 default: 947 goto bad_option; 948 } 949 } 950 951 if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e') 952 goto bad_option; 953 /* 954 * Look for bus speed option: "idebus=" 955 */ 956 if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') { 957 if (match_parm(&s[6], NULL, vals, 1) != 1) 958 goto bad_option; 959 if (vals[0] >= 20 && vals[0] <= 66) { 960 idebus_parameter = vals[0]; 961 } else 962 printk(" -- BAD BUS SPEED! Expected value from 20 to 66"); 963 goto obsolete_option; 964 } 965 966bad_option: 967 printk(" -- BAD OPTION\n"); 968 return 1; 969obsolete_option: 970 printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n"); 971 return 1; 972} 973 974EXPORT_SYMBOL(ide_lock); 975 976static int ide_bus_match(struct device *dev, struct device_driver *drv) 977{ 978 return 1; 979} 980 981static char *media_string(ide_drive_t *drive) 982{ 983 switch (drive->media) { 984 case ide_disk: 985 return "disk"; 986 case ide_cdrom: 987 return "cdrom"; 988 case ide_tape: 989 return "tape"; 990 case ide_floppy: 991 return "floppy"; 992 case ide_optical: 993 return "optical"; 994 default: 995 return "UNKNOWN"; 996 } 997} 998 999static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf) 1000{ 1001 ide_drive_t *drive = to_ide_device(dev); 1002 return sprintf(buf, "%s\n", media_string(drive)); 1003} 1004 1005static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf) 1006{ 1007 ide_drive_t *drive = to_ide_device(dev); 1008 return sprintf(buf, "%s\n", drive->name); 1009} 1010 1011static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) 1012{ 1013 ide_drive_t *drive = to_ide_device(dev); 1014 return sprintf(buf, "ide:m-%s\n", media_string(drive)); 1015} 1016 1017static ssize_t model_show(struct device *dev, struct device_attribute *attr, 1018 char *buf) 1019{ 1020 ide_drive_t *drive = to_ide_device(dev); 1021 return sprintf(buf, "%s\n", drive->id->model); 1022} 1023 1024static ssize_t firmware_show(struct device *dev, struct device_attribute *attr, 1025 char *buf) 1026{ 1027 ide_drive_t *drive = to_ide_device(dev); 1028 return sprintf(buf, "%s\n", drive->id->fw_rev); 1029} 1030 1031static ssize_t serial_show(struct device *dev, struct device_attribute *attr, 1032 char *buf) 1033{ 1034 ide_drive_t *drive = to_ide_device(dev); 1035 return sprintf(buf, "%s\n", drive->id->serial_no); 1036} 1037 1038static struct device_attribute ide_dev_attrs[] = { 1039 __ATTR_RO(media), 1040 __ATTR_RO(drivename), 1041 __ATTR_RO(modalias), 1042 __ATTR_RO(model), 1043 __ATTR_RO(firmware), 1044 __ATTR(serial, 0400, serial_show, NULL), 1045 __ATTR_NULL 1046}; 1047 1048static int ide_uevent(struct device *dev, struct kobj_uevent_env *env) 1049{ 1050 ide_drive_t *drive = to_ide_device(dev); 1051 1052 add_uevent_var(env, "MEDIA=%s", media_string(drive)); 1053 add_uevent_var(env, "DRIVENAME=%s", drive->name); 1054 add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive)); 1055 return 0; 1056} 1057 1058static int generic_ide_probe(struct device *dev) 1059{ 1060 ide_drive_t *drive = to_ide_device(dev); 1061 ide_driver_t *drv = to_ide_driver(dev->driver); 1062 1063 return drv->probe ? drv->probe(drive) : -ENODEV; 1064} 1065 1066static int generic_ide_remove(struct device *dev) 1067{ 1068 ide_drive_t *drive = to_ide_device(dev); 1069 ide_driver_t *drv = to_ide_driver(dev->driver); 1070 1071 if (drv->remove) 1072 drv->remove(drive); 1073 1074 return 0; 1075} 1076 1077static void generic_ide_shutdown(struct device *dev) 1078{ 1079 ide_drive_t *drive = to_ide_device(dev); 1080 ide_driver_t *drv = to_ide_driver(dev->driver); 1081 1082 if (dev->driver && drv->shutdown) 1083 drv->shutdown(drive); 1084} 1085 1086struct bus_type ide_bus_type = { 1087 .name = "ide", 1088 .match = ide_bus_match, 1089 .uevent = ide_uevent, 1090 .probe = generic_ide_probe, 1091 .remove = generic_ide_remove, 1092 .shutdown = generic_ide_shutdown, 1093 .dev_attrs = ide_dev_attrs, 1094 .suspend = generic_ide_suspend, 1095 .resume = generic_ide_resume, 1096}; 1097 1098EXPORT_SYMBOL_GPL(ide_bus_type); 1099 1100static void ide_port_class_release(struct device *portdev) 1101{ 1102 ide_hwif_t *hwif = dev_get_drvdata(portdev); 1103 1104 put_device(&hwif->gendev); 1105} 1106 1107int ide_vlb_clk; 1108EXPORT_SYMBOL_GPL(ide_vlb_clk); 1109 1110module_param_named(vlb_clock, ide_vlb_clk, int, 0); 1111MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)"); 1112 1113int ide_pci_clk; 1114EXPORT_SYMBOL_GPL(ide_pci_clk); 1115 1116module_param_named(pci_clock, ide_pci_clk, int, 0); 1117MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)"); 1118 1119static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp) 1120{ 1121 int a, b, i, j = 1; 1122 unsigned int *dev_param_mask = (unsigned int *)kp->arg; 1123 1124 if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 && 1125 sscanf(s, "%d.%d", &a, &b) != 2) 1126 return -EINVAL; 1127 1128 i = a * MAX_DRIVES + b; 1129 1130 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 1131 return -EINVAL; 1132 1133 if (j) 1134 *dev_param_mask |= (1 << i); 1135 else 1136 *dev_param_mask &= (1 << i); 1137 1138 return 0; 1139} 1140 1141static unsigned int ide_nodma; 1142 1143module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0); 1144MODULE_PARM_DESC(nodma, "disallow DMA for a device"); 1145 1146static unsigned int ide_noflush; 1147 1148module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0); 1149MODULE_PARM_DESC(noflush, "disable flush requests for a device"); 1150 1151static unsigned int ide_noprobe; 1152 1153module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0); 1154MODULE_PARM_DESC(noprobe, "skip probing for a device"); 1155 1156static unsigned int ide_nowerr; 1157 1158module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0); 1159MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device"); 1160 1161static unsigned int ide_cdroms; 1162 1163module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0); 1164MODULE_PARM_DESC(cdrom, "force device as a CD-ROM"); 1165 1166struct chs_geom { 1167 unsigned int cyl; 1168 u8 head; 1169 u8 sect; 1170}; 1171 1172static unsigned int ide_disks; 1173static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES]; 1174 1175static int ide_set_disk_chs(const char *str, struct kernel_param *kp) 1176{ 1177 int a, b, c = 0, h = 0, s = 0, i, j = 1; 1178 1179 if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 && 1180 sscanf(str, "%d.%d:%d", &a, &b, &j) != 3) 1181 return -EINVAL; 1182 1183 i = a * MAX_DRIVES + b; 1184 1185 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 1186 return -EINVAL; 1187 1188 if (c > INT_MAX || h > 255 || s > 255) 1189 return -EINVAL; 1190 1191 if (j) 1192 ide_disks |= (1 << i); 1193 else 1194 ide_disks &= (1 << i); 1195 1196 ide_disks_chs[i].cyl = c; 1197 ide_disks_chs[i].head = h; 1198 ide_disks_chs[i].sect = s; 1199 1200 return 0; 1201} 1202 1203module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0); 1204MODULE_PARM_DESC(chs, "force device as a disk (using CHS)"); 1205 1206static void ide_dev_apply_params(ide_drive_t *drive) 1207{ 1208 int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit; 1209 1210 if (ide_nodma & (1 << i)) { 1211 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name); 1212 drive->nodma = 1; 1213 } 1214 if (ide_noflush & (1 << i)) { 1215 printk(KERN_INFO "ide: disabling flush requests for %s\n", 1216 drive->name); 1217 drive->noflush = 1; 1218 } 1219 if (ide_noprobe & (1 << i)) { 1220 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name); 1221 drive->noprobe = 1; 1222 } 1223 if (ide_nowerr & (1 << i)) { 1224 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n", 1225 drive->name); 1226 drive->bad_wstat = BAD_R_STAT; 1227 } 1228 if (ide_cdroms & (1 << i)) { 1229 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name); 1230 drive->present = 1; 1231 drive->media = ide_cdrom; 1232 /* an ATAPI device ignores DRDY */ 1233 drive->ready_stat = 0; 1234 } 1235 if (ide_disks & (1 << i)) { 1236 drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl; 1237 drive->head = drive->bios_head = ide_disks_chs[i].head; 1238 drive->sect = drive->bios_sect = ide_disks_chs[i].sect; 1239 drive->forced_geom = 1; 1240 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n", 1241 drive->name, 1242 drive->cyl, drive->head, drive->sect); 1243 drive->present = 1; 1244 drive->media = ide_disk; 1245 drive->ready_stat = READY_STAT; 1246 } 1247} 1248 1249static unsigned int ide_ignore_cable; 1250 1251static int ide_set_ignore_cable(const char *s, struct kernel_param *kp) 1252{ 1253 int i, j = 1; 1254 1255 if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1) 1256 return -EINVAL; 1257 1258 if (i >= MAX_HWIFS || j < 0 || j > 1) 1259 return -EINVAL; 1260 1261 if (j) 1262 ide_ignore_cable |= (1 << i); 1263 else 1264 ide_ignore_cable &= (1 << i); 1265 1266 return 0; 1267} 1268 1269module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0); 1270MODULE_PARM_DESC(ignore_cable, "ignore cable detection"); 1271 1272void ide_port_apply_params(ide_hwif_t *hwif) 1273{ 1274 int i; 1275 1276 if (ide_ignore_cable & (1 << hwif->index)) { 1277 printk(KERN_INFO "ide: ignoring cable detection for %s\n", 1278 hwif->name); 1279 hwif->cbl = ATA_CBL_PATA40_SHORT; 1280 } 1281 1282 for (i = 0; i < MAX_DRIVES; i++) 1283 ide_dev_apply_params(&hwif->drives[i]); 1284} 1285 1286/* 1287 * This is gets invoked once during initialization, to set *everything* up 1288 */ 1289static int __init ide_init(void) 1290{ 1291 int ret; 1292 1293 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n"); 1294 system_bus_speed = ide_system_bus_speed(); 1295 1296 printk(KERN_INFO "ide: Assuming %dMHz system bus speed " 1297 "for PIO modes%s\n", system_bus_speed, 1298 idebus_parameter ? "" : "; override with idebus=xx"); 1299 1300 ret = bus_register(&ide_bus_type); 1301 if (ret < 0) { 1302 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret); 1303 return ret; 1304 } 1305 1306 ide_port_class = class_create(THIS_MODULE, "ide_port"); 1307 if (IS_ERR(ide_port_class)) { 1308 ret = PTR_ERR(ide_port_class); 1309 goto out_port_class; 1310 } 1311 ide_port_class->dev_release = ide_port_class_release; 1312 1313 init_ide_data(); 1314 1315 proc_ide_create(); 1316 1317 return 0; 1318 1319out_port_class: 1320 bus_unregister(&ide_bus_type); 1321 1322 return ret; 1323} 1324 1325#ifdef MODULE 1326static char *options = NULL; 1327module_param(options, charp, 0); 1328MODULE_LICENSE("GPL"); 1329 1330static void __init parse_options (char *line) 1331{ 1332 char *next = line; 1333 1334 if (line == NULL || !*line) 1335 return; 1336 while ((line = next) != NULL) { 1337 if ((next = strchr(line,' ')) != NULL) 1338 *next++ = 0; 1339 if (!ide_setup(line)) 1340 printk (KERN_INFO "Unknown option '%s'\n", line); 1341 } 1342} 1343 1344int __init init_module (void) 1345{ 1346 parse_options(options); 1347 return ide_init(); 1348} 1349 1350void __exit cleanup_module (void) 1351{ 1352 proc_ide_destroy(); 1353 1354 class_destroy(ide_port_class); 1355 1356 bus_unregister(&ide_bus_type); 1357} 1358 1359#else /* !MODULE */ 1360 1361__setup("", ide_setup); 1362 1363module_init(ide_init); 1364 1365#endif /* MODULE */ 1366