ide.c revision 5e37bdc081a980dd0d669e6387bcf15ca9666f81
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 97#ifdef CONFIG_BLK_DEV_IDEACPI 98int ide_noacpi = 0; 99int ide_noacpitfs = 1; 100int ide_noacpionboot = 1; 101#endif 102 103ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */ 104 105static void ide_port_init_devices_data(ide_hwif_t *); 106 107/* 108 * Do not even *think* about calling this! 109 */ 110void ide_init_port_data(ide_hwif_t *hwif, unsigned int index) 111{ 112 /* bulk initialize hwif & drive info with zeros */ 113 memset(hwif, 0, sizeof(ide_hwif_t)); 114 115 /* fill in any non-zero initial values */ 116 hwif->index = index; 117 hwif->major = ide_hwif_to_major[index]; 118 119 hwif->name[0] = 'i'; 120 hwif->name[1] = 'd'; 121 hwif->name[2] = 'e'; 122 hwif->name[3] = '0' + index; 123 124 hwif->bus_state = BUSSTATE_ON; 125 126 init_completion(&hwif->gendev_rel_comp); 127 128 default_hwif_iops(hwif); 129 default_hwif_transport(hwif); 130 131 ide_port_init_devices_data(hwif); 132} 133EXPORT_SYMBOL_GPL(ide_init_port_data); 134 135static void ide_port_init_devices_data(ide_hwif_t *hwif) 136{ 137 int unit; 138 139 for (unit = 0; unit < MAX_DRIVES; ++unit) { 140 ide_drive_t *drive = &hwif->drives[unit]; 141 u8 j = (hwif->index * MAX_DRIVES) + unit; 142 143 memset(drive, 0, sizeof(*drive)); 144 145 drive->media = ide_disk; 146 drive->select.all = (unit<<4)|0xa0; 147 drive->hwif = hwif; 148 drive->ctl = 0x08; 149 drive->ready_stat = READY_STAT; 150 drive->bad_wstat = BAD_W_STAT; 151 drive->special.b.recalibrate = 1; 152 drive->special.b.set_geometry = 1; 153 drive->name[0] = 'h'; 154 drive->name[1] = 'd'; 155 drive->name[2] = 'a' + j; 156 drive->max_failures = IDE_DEFAULT_MAX_FAILURES; 157 158 INIT_LIST_HEAD(&drive->list); 159 init_completion(&drive->gendev_rel_comp); 160 } 161} 162 163/* 164 * init_ide_data() sets reasonable default values into all fields 165 * of all instances of the hwifs and drives, but only on the first call. 166 * Subsequent calls have no effect (they don't wipe out anything). 167 * 168 * This routine is normally called at driver initialization time, 169 * but may also be called MUCH earlier during kernel "command-line" 170 * parameter processing. As such, we cannot depend on any other parts 171 * of the kernel (such as memory allocation) to be functioning yet. 172 * 173 * This is too bad, as otherwise we could dynamically allocate the 174 * ide_drive_t structs as needed, rather than always consuming memory 175 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them. 176 * 177 * FIXME: We should stuff the setup data into __init and copy the 178 * relevant hwifs/allocate them properly during boot. 179 */ 180#define MAGIC_COOKIE 0x12345678 181static void __init init_ide_data (void) 182{ 183 unsigned int index; 184 static unsigned long magic_cookie = MAGIC_COOKIE; 185 186 if (magic_cookie != MAGIC_COOKIE) 187 return; /* already initialized */ 188 magic_cookie = 0; 189 190 /* Initialise all interface structures */ 191 for (index = 0; index < MAX_HWIFS; ++index) { 192 ide_hwif_t *hwif = &ide_hwifs[index]; 193 194 ide_init_port_data(hwif, index); 195 } 196} 197 198/** 199 * ide_system_bus_speed - guess bus speed 200 * 201 * ide_system_bus_speed() returns what we think is the system VESA/PCI 202 * bus speed (in MHz). This is used for calculating interface PIO timings. 203 * The default is 40 for known PCI systems, 50 otherwise. 204 * The "idebus=xx" parameter can be used to override this value. 205 * The actual value to be used is computed/displayed the first time 206 * through. Drivers should only use this as a last resort. 207 * 208 * Returns a guessed speed in MHz. 209 */ 210 211static int ide_system_bus_speed(void) 212{ 213#ifdef CONFIG_PCI 214 static struct pci_device_id pci_default[] = { 215 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) }, 216 { } 217 }; 218#else 219#define pci_default 0 220#endif /* CONFIG_PCI */ 221 222 /* user supplied value */ 223 if (idebus_parameter) 224 return idebus_parameter; 225 226 /* safe default value for PCI or VESA and PCI*/ 227 return pci_dev_present(pci_default) ? 33 : 50; 228} 229 230void ide_remove_port_from_hwgroup(ide_hwif_t *hwif) 231{ 232 ide_hwgroup_t *hwgroup = hwif->hwgroup; 233 234 spin_lock_irq(&ide_lock); 235 /* 236 * Remove us from the hwgroup, and free 237 * the hwgroup if we were the only member 238 */ 239 if (hwif->next == hwif) { 240 BUG_ON(hwgroup->hwif != hwif); 241 kfree(hwgroup); 242 } else { 243 /* There is another interface in hwgroup. 244 * Unlink us, and set hwgroup->drive and ->hwif to 245 * something sane. 246 */ 247 ide_hwif_t *g = hwgroup->hwif; 248 249 while (g->next != hwif) 250 g = g->next; 251 g->next = hwif->next; 252 if (hwgroup->hwif == hwif) { 253 /* Chose a random hwif for hwgroup->hwif. 254 * It's guaranteed that there are no drives 255 * left in the hwgroup. 256 */ 257 BUG_ON(hwgroup->drive != NULL); 258 hwgroup->hwif = g; 259 } 260 BUG_ON(hwgroup->hwif == hwif); 261 } 262 spin_unlock_irq(&ide_lock); 263} 264 265/* Called with ide_lock held. */ 266static void __ide_port_unregister_devices(ide_hwif_t *hwif) 267{ 268 int i; 269 270 for (i = 0; i < MAX_DRIVES; i++) { 271 ide_drive_t *drive = &hwif->drives[i]; 272 273 if (drive->present) { 274 spin_unlock_irq(&ide_lock); 275 device_unregister(&drive->gendev); 276 wait_for_completion(&drive->gendev_rel_comp); 277 spin_lock_irq(&ide_lock); 278 } 279 } 280} 281 282void ide_port_unregister_devices(ide_hwif_t *hwif) 283{ 284 mutex_lock(&ide_cfg_mtx); 285 spin_lock_irq(&ide_lock); 286 __ide_port_unregister_devices(hwif); 287 hwif->present = 0; 288 ide_port_init_devices_data(hwif); 289 spin_unlock_irq(&ide_lock); 290 mutex_unlock(&ide_cfg_mtx); 291} 292EXPORT_SYMBOL_GPL(ide_port_unregister_devices); 293 294/** 295 * ide_unregister - free an IDE interface 296 * @index: index of interface (will change soon to a pointer) 297 * 298 * Perform the final unregister of an IDE interface. At the moment 299 * we don't refcount interfaces so this will also get split up. 300 * 301 * Locking: 302 * The caller must not hold the IDE locks 303 * The drive present/vanishing is not yet properly locked 304 * Take care with the callbacks. These have been split to avoid 305 * deadlocking the IDE layer. The shutdown callback is called 306 * before we take the lock and free resources. It is up to the 307 * caller to be sure there is no pending I/O here, and that 308 * the interface will not be reopened (present/vanishing locking 309 * isn't yet done BTW). After we commit to the final kill we 310 * call the cleanup callback with the ide locks held. 311 * 312 * Unregister restores the hwif structures to the default state. 313 * This is raving bonkers. 314 */ 315 316void ide_unregister(unsigned int index) 317{ 318 ide_hwif_t *hwif, *g; 319 ide_hwgroup_t *hwgroup; 320 int irq_count = 0; 321 322 BUG_ON(index >= MAX_HWIFS); 323 324 BUG_ON(in_interrupt()); 325 BUG_ON(irqs_disabled()); 326 mutex_lock(&ide_cfg_mtx); 327 spin_lock_irq(&ide_lock); 328 hwif = &ide_hwifs[index]; 329 if (!hwif->present) 330 goto abort; 331 __ide_port_unregister_devices(hwif); 332 hwif->present = 0; 333 334 spin_unlock_irq(&ide_lock); 335 336 ide_proc_unregister_port(hwif); 337 338 hwgroup = hwif->hwgroup; 339 /* 340 * free the irq if we were the only hwif using it 341 */ 342 g = hwgroup->hwif; 343 do { 344 if (g->irq == hwif->irq) 345 ++irq_count; 346 g = g->next; 347 } while (g != hwgroup->hwif); 348 if (irq_count == 1) 349 free_irq(hwif->irq, hwgroup); 350 351 ide_remove_port_from_hwgroup(hwif); 352 353 device_unregister(hwif->portdev); 354 device_unregister(&hwif->gendev); 355 wait_for_completion(&hwif->gendev_rel_comp); 356 357 /* 358 * Remove us from the kernel's knowledge 359 */ 360 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS); 361 kfree(hwif->sg_table); 362 unregister_blkdev(hwif->major, hwif->name); 363 spin_lock_irq(&ide_lock); 364 365 if (hwif->dma_base) 366 ide_release_dma_engine(hwif); 367 368 /* restore hwif data to pristine status */ 369 ide_init_port_data(hwif, index); 370 371abort: 372 spin_unlock_irq(&ide_lock); 373 mutex_unlock(&ide_cfg_mtx); 374} 375 376EXPORT_SYMBOL(ide_unregister); 377 378void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw) 379{ 380 memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports)); 381 hwif->irq = hw->irq; 382 hwif->chipset = hw->chipset; 383 hwif->gendev.parent = hw->dev; 384 hwif->ack_intr = hw->ack_intr; 385} 386EXPORT_SYMBOL_GPL(ide_init_port_hw); 387 388/* 389 * Locks for IDE setting functionality 390 */ 391 392DEFINE_MUTEX(ide_setting_mtx); 393 394EXPORT_SYMBOL_GPL(ide_setting_mtx); 395 396/** 397 * ide_spin_wait_hwgroup - wait for group 398 * @drive: drive in the group 399 * 400 * Wait for an IDE device group to go non busy and then return 401 * holding the ide_lock which guards the hwgroup->busy status 402 * and right to use it. 403 */ 404 405int ide_spin_wait_hwgroup (ide_drive_t *drive) 406{ 407 ide_hwgroup_t *hwgroup = HWGROUP(drive); 408 unsigned long timeout = jiffies + (3 * HZ); 409 410 spin_lock_irq(&ide_lock); 411 412 while (hwgroup->busy) { 413 unsigned long lflags; 414 spin_unlock_irq(&ide_lock); 415 local_irq_set(lflags); 416 if (time_after(jiffies, timeout)) { 417 local_irq_restore(lflags); 418 printk(KERN_ERR "%s: channel busy\n", drive->name); 419 return -EBUSY; 420 } 421 local_irq_restore(lflags); 422 spin_lock_irq(&ide_lock); 423 } 424 return 0; 425} 426 427EXPORT_SYMBOL(ide_spin_wait_hwgroup); 428 429int set_io_32bit(ide_drive_t *drive, int arg) 430{ 431 if (drive->no_io_32bit) 432 return -EPERM; 433 434 if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1)) 435 return -EINVAL; 436 437 if (ide_spin_wait_hwgroup(drive)) 438 return -EBUSY; 439 440 drive->io_32bit = arg; 441 442 spin_unlock_irq(&ide_lock); 443 444 return 0; 445} 446 447static int set_ksettings(ide_drive_t *drive, int arg) 448{ 449 if (arg < 0 || arg > 1) 450 return -EINVAL; 451 452 if (ide_spin_wait_hwgroup(drive)) 453 return -EBUSY; 454 drive->keep_settings = arg; 455 spin_unlock_irq(&ide_lock); 456 457 return 0; 458} 459 460int set_using_dma(ide_drive_t *drive, int arg) 461{ 462#ifdef CONFIG_BLK_DEV_IDEDMA 463 ide_hwif_t *hwif = drive->hwif; 464 int err = -EPERM; 465 466 if (arg < 0 || arg > 1) 467 return -EINVAL; 468 469 if (!drive->id || !(drive->id->capability & 1)) 470 goto out; 471 472 if (hwif->dma_ops == NULL) 473 goto out; 474 475 err = -EBUSY; 476 if (ide_spin_wait_hwgroup(drive)) 477 goto out; 478 /* 479 * set ->busy flag, unlock and let it ride 480 */ 481 hwif->hwgroup->busy = 1; 482 spin_unlock_irq(&ide_lock); 483 484 err = 0; 485 486 if (arg) { 487 if (ide_set_dma(drive)) 488 err = -EIO; 489 } else 490 ide_dma_off(drive); 491 492 /* 493 * lock, clear ->busy flag and unlock before leaving 494 */ 495 spin_lock_irq(&ide_lock); 496 hwif->hwgroup->busy = 0; 497 spin_unlock_irq(&ide_lock); 498out: 499 return err; 500#else 501 if (arg < 0 || arg > 1) 502 return -EINVAL; 503 504 return -EPERM; 505#endif 506} 507 508int set_pio_mode(ide_drive_t *drive, int arg) 509{ 510 struct request rq; 511 ide_hwif_t *hwif = drive->hwif; 512 const struct ide_port_ops *port_ops = hwif->port_ops; 513 514 if (arg < 0 || arg > 255) 515 return -EINVAL; 516 517 if (port_ops == NULL || port_ops->set_pio_mode == NULL || 518 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) 519 return -ENOSYS; 520 521 if (drive->special.b.set_tune) 522 return -EBUSY; 523 524 ide_init_drive_cmd(&rq); 525 rq.cmd_type = REQ_TYPE_ATA_TASKFILE; 526 527 drive->tune_req = (u8) arg; 528 drive->special.b.set_tune = 1; 529 (void) ide_do_drive_cmd(drive, &rq, ide_wait); 530 return 0; 531} 532 533static int set_unmaskirq(ide_drive_t *drive, int arg) 534{ 535 if (drive->no_unmask) 536 return -EPERM; 537 538 if (arg < 0 || arg > 1) 539 return -EINVAL; 540 541 if (ide_spin_wait_hwgroup(drive)) 542 return -EBUSY; 543 drive->unmask = arg; 544 spin_unlock_irq(&ide_lock); 545 546 return 0; 547} 548 549/** 550 * system_bus_clock - clock guess 551 * 552 * External version of the bus clock guess used by very old IDE drivers 553 * for things like VLB timings. Should not be used. 554 */ 555 556int system_bus_clock (void) 557{ 558 return system_bus_speed; 559} 560 561EXPORT_SYMBOL(system_bus_clock); 562 563static int generic_ide_suspend(struct device *dev, pm_message_t mesg) 564{ 565 ide_drive_t *drive = dev->driver_data; 566 ide_hwif_t *hwif = HWIF(drive); 567 struct request rq; 568 struct request_pm_state rqpm; 569 ide_task_t args; 570 int ret; 571 572 /* Call ACPI _GTM only once */ 573 if (!(drive->dn % 2)) 574 ide_acpi_get_timing(hwif); 575 576 memset(&rq, 0, sizeof(rq)); 577 memset(&rqpm, 0, sizeof(rqpm)); 578 memset(&args, 0, sizeof(args)); 579 rq.cmd_type = REQ_TYPE_PM_SUSPEND; 580 rq.special = &args; 581 rq.data = &rqpm; 582 rqpm.pm_step = ide_pm_state_start_suspend; 583 if (mesg.event == PM_EVENT_PRETHAW) 584 mesg.event = PM_EVENT_FREEZE; 585 rqpm.pm_state = mesg.event; 586 587 ret = ide_do_drive_cmd(drive, &rq, ide_wait); 588 /* only call ACPI _PS3 after both drivers are suspended */ 589 if (!ret && (((drive->dn % 2) && hwif->drives[0].present 590 && hwif->drives[1].present) 591 || !hwif->drives[0].present 592 || !hwif->drives[1].present)) 593 ide_acpi_set_state(hwif, 0); 594 return ret; 595} 596 597static int generic_ide_resume(struct device *dev) 598{ 599 ide_drive_t *drive = dev->driver_data; 600 ide_hwif_t *hwif = HWIF(drive); 601 struct request rq; 602 struct request_pm_state rqpm; 603 ide_task_t args; 604 int err; 605 606 /* Call ACPI _STM only once */ 607 if (!(drive->dn % 2)) { 608 ide_acpi_set_state(hwif, 1); 609 ide_acpi_push_timing(hwif); 610 } 611 612 ide_acpi_exec_tfs(drive); 613 614 memset(&rq, 0, sizeof(rq)); 615 memset(&rqpm, 0, sizeof(rqpm)); 616 memset(&args, 0, sizeof(args)); 617 rq.cmd_type = REQ_TYPE_PM_RESUME; 618 rq.special = &args; 619 rq.data = &rqpm; 620 rqpm.pm_step = ide_pm_state_start_resume; 621 rqpm.pm_state = PM_EVENT_ON; 622 623 err = ide_do_drive_cmd(drive, &rq, ide_head_wait); 624 625 if (err == 0 && dev->driver) { 626 ide_driver_t *drv = to_ide_driver(dev->driver); 627 628 if (drv->resume) 629 drv->resume(drive); 630 } 631 632 return err; 633} 634 635int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev, 636 unsigned int cmd, unsigned long arg) 637{ 638 unsigned long flags; 639 ide_driver_t *drv; 640 void __user *p = (void __user *)arg; 641 int err = 0, (*setfunc)(ide_drive_t *, int); 642 u8 *val; 643 644 switch (cmd) { 645 case HDIO_GET_32BIT: val = &drive->io_32bit; goto read_val; 646 case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val; 647 case HDIO_GET_UNMASKINTR: val = &drive->unmask; goto read_val; 648 case HDIO_GET_DMA: val = &drive->using_dma; goto read_val; 649 case HDIO_SET_32BIT: setfunc = set_io_32bit; goto set_val; 650 case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings; goto set_val; 651 case HDIO_SET_PIO_MODE: setfunc = set_pio_mode; goto set_val; 652 case HDIO_SET_UNMASKINTR: setfunc = set_unmaskirq; goto set_val; 653 case HDIO_SET_DMA: setfunc = set_using_dma; goto set_val; 654 } 655 656 switch (cmd) { 657 case HDIO_OBSOLETE_IDENTITY: 658 case HDIO_GET_IDENTITY: 659 if (bdev != bdev->bd_contains) 660 return -EINVAL; 661 if (drive->id_read == 0) 662 return -ENOMSG; 663 if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142)) 664 return -EFAULT; 665 return 0; 666 667 case HDIO_GET_NICE: 668 return put_user(drive->dsc_overlap << IDE_NICE_DSC_OVERLAP | 669 drive->atapi_overlap << IDE_NICE_ATAPI_OVERLAP | 670 drive->nice1 << IDE_NICE_1, 671 (long __user *) arg); 672#ifdef CONFIG_IDE_TASK_IOCTL 673 case HDIO_DRIVE_TASKFILE: 674 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 675 return -EACCES; 676 switch(drive->media) { 677 case ide_disk: 678 return ide_taskfile_ioctl(drive, cmd, arg); 679 default: 680 return -ENOMSG; 681 } 682#endif /* CONFIG_IDE_TASK_IOCTL */ 683 684 case HDIO_DRIVE_CMD: 685 if (!capable(CAP_SYS_RAWIO)) 686 return -EACCES; 687 return ide_cmd_ioctl(drive, cmd, arg); 688 689 case HDIO_DRIVE_TASK: 690 if (!capable(CAP_SYS_RAWIO)) 691 return -EACCES; 692 return ide_task_ioctl(drive, cmd, arg); 693 case HDIO_SET_NICE: 694 if (!capable(CAP_SYS_ADMIN)) return -EACCES; 695 if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1)))) 696 return -EPERM; 697 drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1; 698 drv = *(ide_driver_t **)bdev->bd_disk->private_data; 699 if (drive->dsc_overlap && !drv->supports_dsc_overlap) { 700 drive->dsc_overlap = 0; 701 return -EPERM; 702 } 703 drive->nice1 = (arg >> IDE_NICE_1) & 1; 704 return 0; 705 case HDIO_DRIVE_RESET: 706 if (!capable(CAP_SYS_ADMIN)) 707 return -EACCES; 708 709 /* 710 * Abort the current command on the 711 * group if there is one, taking 712 * care not to allow anything else 713 * to be queued and to die on the 714 * spot if we miss one somehow 715 */ 716 717 spin_lock_irqsave(&ide_lock, flags); 718 719 if (HWGROUP(drive)->resetting) { 720 spin_unlock_irqrestore(&ide_lock, flags); 721 return -EBUSY; 722 } 723 724 ide_abort(drive, "drive reset"); 725 726 BUG_ON(HWGROUP(drive)->handler); 727 728 /* Ensure nothing gets queued after we 729 drop the lock. Reset will clear the busy */ 730 731 HWGROUP(drive)->busy = 1; 732 spin_unlock_irqrestore(&ide_lock, flags); 733 (void) ide_do_reset(drive); 734 735 return 0; 736 case HDIO_GET_BUSSTATE: 737 if (!capable(CAP_SYS_ADMIN)) 738 return -EACCES; 739 if (put_user(HWIF(drive)->bus_state, (long __user *)arg)) 740 return -EFAULT; 741 return 0; 742 743 case HDIO_SET_BUSSTATE: 744 if (!capable(CAP_SYS_ADMIN)) 745 return -EACCES; 746 return -EOPNOTSUPP; 747 default: 748 return -EINVAL; 749 } 750 751read_val: 752 mutex_lock(&ide_setting_mtx); 753 spin_lock_irqsave(&ide_lock, flags); 754 err = *val; 755 spin_unlock_irqrestore(&ide_lock, flags); 756 mutex_unlock(&ide_setting_mtx); 757 return err >= 0 ? put_user(err, (long __user *)arg) : err; 758 759set_val: 760 if (bdev != bdev->bd_contains) 761 err = -EINVAL; 762 else { 763 if (!capable(CAP_SYS_ADMIN)) 764 err = -EACCES; 765 else { 766 mutex_lock(&ide_setting_mtx); 767 err = setfunc(drive, arg); 768 mutex_unlock(&ide_setting_mtx); 769 } 770 } 771 return err; 772} 773 774EXPORT_SYMBOL(generic_ide_ioctl); 775 776/* 777 * stridx() returns the offset of c within s, 778 * or -1 if c is '\0' or not found within s. 779 */ 780static int __init stridx (const char *s, char c) 781{ 782 char *i = strchr(s, c); 783 return (i && c) ? i - s : -1; 784} 785 786/* 787 * match_parm() does parsing for ide_setup(): 788 * 789 * 1. the first char of s must be '='. 790 * 2. if the remainder matches one of the supplied keywords, 791 * the index (1 based) of the keyword is negated and returned. 792 * 3. if the remainder is a series of no more than max_vals numbers 793 * separated by commas, the numbers are saved in vals[] and a 794 * count of how many were saved is returned. Base10 is assumed, 795 * and base16 is allowed when prefixed with "0x". 796 * 4. otherwise, zero is returned. 797 */ 798static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals) 799{ 800 static const char *decimal = "0123456789"; 801 static const char *hex = "0123456789abcdef"; 802 int i, n; 803 804 if (*s++ == '=') { 805 /* 806 * Try matching against the supplied keywords, 807 * and return -(index+1) if we match one 808 */ 809 if (keywords != NULL) { 810 for (i = 0; *keywords != NULL; ++i) { 811 if (!strcmp(s, *keywords++)) 812 return -(i+1); 813 } 814 } 815 /* 816 * Look for a series of no more than "max_vals" 817 * numeric values separated by commas, in base10, 818 * or base16 when prefixed with "0x". 819 * Return a count of how many were found. 820 */ 821 for (n = 0; (i = stridx(decimal, *s)) >= 0;) { 822 vals[n] = i; 823 while ((i = stridx(decimal, *++s)) >= 0) 824 vals[n] = (vals[n] * 10) + i; 825 if (*s == 'x' && !vals[n]) { 826 while ((i = stridx(hex, *++s)) >= 0) 827 vals[n] = (vals[n] * 0x10) + i; 828 } 829 if (++n == max_vals) 830 break; 831 if (*s == ',' || *s == ';') 832 ++s; 833 } 834 if (!*s) 835 return n; 836 } 837 return 0; /* zero = nothing matched */ 838} 839 840extern int probe_ali14xx; 841extern int probe_umc8672; 842extern int probe_dtc2278; 843extern int probe_ht6560b; 844extern int probe_qd65xx; 845extern int cmd640_vlb; 846extern int probe_4drives; 847 848static int __initdata is_chipset_set; 849 850/* 851 * ide_setup() gets called VERY EARLY during initialization, 852 * to handle kernel "command line" strings beginning with "hdx=" or "ide". 853 * 854 * Remember to update Documentation/ide/ide.txt if you change something here. 855 */ 856static int __init ide_setup(char *s) 857{ 858 int i, vals[3]; 859 ide_hwif_t *hwif; 860 ide_drive_t *drive; 861 unsigned int hw, unit; 862 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1); 863 const char max_hwif = '0' + (MAX_HWIFS - 1); 864 865 866 if (strncmp(s,"hd",2) == 0 && s[2] == '=') /* hd= is for hd.c */ 867 return 0; /* driver and not us */ 868 869 if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2)) 870 return 0; 871 872 printk(KERN_INFO "ide_setup: %s", s); 873 init_ide_data (); 874 875#ifdef CONFIG_BLK_DEV_IDEDOUBLER 876 if (!strcmp(s, "ide=doubler")) { 877 extern int ide_doubler; 878 879 printk(" : Enabled support for IDE doublers\n"); 880 ide_doubler = 1; 881 return 1; 882 } 883#endif /* CONFIG_BLK_DEV_IDEDOUBLER */ 884 885 if (!strcmp(s, "ide=nodma")) { 886 printk(" : Prevented DMA\n"); 887 noautodma = 1; 888 goto obsolete_option; 889 } 890 891#ifdef CONFIG_BLK_DEV_IDEACPI 892 if (!strcmp(s, "ide=noacpi")) { 893 //printk(" : Disable IDE ACPI support.\n"); 894 ide_noacpi = 1; 895 return 1; 896 } 897 if (!strcmp(s, "ide=acpigtf")) { 898 //printk(" : Enable IDE ACPI _GTF support.\n"); 899 ide_noacpitfs = 0; 900 return 1; 901 } 902 if (!strcmp(s, "ide=acpionboot")) { 903 //printk(" : Call IDE ACPI methods on boot.\n"); 904 ide_noacpionboot = 0; 905 return 1; 906 } 907#endif /* CONFIG_BLK_DEV_IDEACPI */ 908 909 /* 910 * Look for drive options: "hdx=" 911 */ 912 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) { 913 const char *hd_words[] = { 914 "none", "noprobe", "nowerr", "cdrom", "nodma", 915 "autotune", "noautotune", "-8", "-9", "-10", 916 "noflush", "remap", "remap63", "scsi", NULL }; 917 unit = s[2] - 'a'; 918 hw = unit / MAX_DRIVES; 919 unit = unit % MAX_DRIVES; 920 hwif = &ide_hwifs[hw]; 921 drive = &hwif->drives[unit]; 922 if (strncmp(s + 4, "ide-", 4) == 0) { 923 strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req)); 924 goto obsolete_option; 925 } 926 switch (match_parm(&s[3], hd_words, vals, 3)) { 927 case -1: /* "none" */ 928 case -2: /* "noprobe" */ 929 drive->noprobe = 1; 930 goto done; 931 case -3: /* "nowerr" */ 932 drive->bad_wstat = BAD_R_STAT; 933 goto done; 934 case -4: /* "cdrom" */ 935 drive->present = 1; 936 drive->media = ide_cdrom; 937 /* an ATAPI device ignores DRDY */ 938 drive->ready_stat = 0; 939 goto done; 940 case -5: /* nodma */ 941 drive->nodma = 1; 942 goto done; 943 case -6: /* "autotune" */ 944 drive->autotune = IDE_TUNE_AUTO; 945 goto obsolete_option; 946 case -7: /* "noautotune" */ 947 drive->autotune = IDE_TUNE_NOAUTO; 948 goto obsolete_option; 949 case -11: /* noflush */ 950 drive->noflush = 1; 951 goto done; 952 case -12: /* "remap" */ 953 drive->remap_0_to_1 = 1; 954 goto obsolete_option; 955 case -13: /* "remap63" */ 956 drive->sect0 = 63; 957 goto obsolete_option; 958 case -14: /* "scsi" */ 959 drive->scsi = 1; 960 goto obsolete_option; 961 case 3: /* cyl,head,sect */ 962 drive->media = ide_disk; 963 drive->ready_stat = READY_STAT; 964 drive->cyl = drive->bios_cyl = vals[0]; 965 drive->head = drive->bios_head = vals[1]; 966 drive->sect = drive->bios_sect = vals[2]; 967 drive->present = 1; 968 drive->forced_geom = 1; 969 goto done; 970 default: 971 goto bad_option; 972 } 973 } 974 975 if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e') 976 goto bad_option; 977 /* 978 * Look for bus speed option: "idebus=" 979 */ 980 if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') { 981 if (match_parm(&s[6], NULL, vals, 1) != 1) 982 goto bad_option; 983 if (vals[0] >= 20 && vals[0] <= 66) { 984 idebus_parameter = vals[0]; 985 } else 986 printk(" -- BAD BUS SPEED! Expected value from 20 to 66"); 987 goto done; 988 } 989 /* 990 * Look for interface options: "idex=" 991 */ 992 if (s[3] >= '0' && s[3] <= max_hwif) { 993 /* 994 * Be VERY CAREFUL changing this: note hardcoded indexes below 995 * (-8, -9, -10) are reserved to ease the hardcoding. 996 */ 997 static const char *ide_words[] = { 998 "minus1", "serialize", "minus3", "minus4", 999 "reset", "minus6", "ata66", "minus8", "minus9", 1000 "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb", 1001 "dtc2278", "umc8672", "ali14xx", NULL }; 1002 1003 hw = s[3] - '0'; 1004 hwif = &ide_hwifs[hw]; 1005 i = match_parm(&s[4], ide_words, vals, 3); 1006 1007 /* 1008 * Cryptic check to ensure chipset not already set for hwif. 1009 * Note: we can't depend on hwif->chipset here. 1010 */ 1011 if (i >= -18 && i <= -11) { 1012 /* chipset already specified */ 1013 if (is_chipset_set) 1014 goto bad_option; 1015 /* these drivers are for "ide0=" only */ 1016 if (hw != 0) 1017 goto bad_hwif; 1018 is_chipset_set = 1; 1019 printk("\n"); 1020 } 1021 1022 switch (i) { 1023#ifdef CONFIG_BLK_DEV_ALI14XX 1024 case -17: /* "ali14xx" */ 1025 probe_ali14xx = 1; 1026 goto obsolete_option; 1027#endif 1028#ifdef CONFIG_BLK_DEV_UMC8672 1029 case -16: /* "umc8672" */ 1030 probe_umc8672 = 1; 1031 goto obsolete_option; 1032#endif 1033#ifdef CONFIG_BLK_DEV_DTC2278 1034 case -15: /* "dtc2278" */ 1035 probe_dtc2278 = 1; 1036 goto obsolete_option; 1037#endif 1038#ifdef CONFIG_BLK_DEV_CMD640 1039 case -14: /* "cmd640_vlb" */ 1040 cmd640_vlb = 1; 1041 goto obsolete_option; 1042#endif 1043#ifdef CONFIG_BLK_DEV_HT6560B 1044 case -13: /* "ht6560b" */ 1045 probe_ht6560b = 1; 1046 goto obsolete_option; 1047#endif 1048#ifdef CONFIG_BLK_DEV_QD65XX 1049 case -12: /* "qd65xx" */ 1050 probe_qd65xx = 1; 1051 goto obsolete_option; 1052#endif 1053#ifdef CONFIG_BLK_DEV_4DRIVES 1054 case -11: /* "four" drives on one set of ports */ 1055 probe_4drives = 1; 1056 goto obsolete_option; 1057#endif 1058 case -10: /* minus10 */ 1059 case -9: /* minus9 */ 1060 case -8: /* minus8 */ 1061 case -6: 1062 case -4: 1063 case -3: 1064 goto bad_option; 1065 case -7: /* ata66 */ 1066#ifdef CONFIG_BLK_DEV_IDEPCI 1067 /* 1068 * Use ATA_CBL_PATA40_SHORT so drive side 1069 * cable detection is also overriden. 1070 */ 1071 hwif->cbl = ATA_CBL_PATA40_SHORT; 1072 goto obsolete_option; 1073#else 1074 goto bad_hwif; 1075#endif 1076 case -5: /* "reset" */ 1077 hwif->reset = 1; 1078 goto obsolete_option; 1079 case -2: /* "serialize" */ 1080 hwif->mate = &ide_hwifs[hw^1]; 1081 hwif->mate->mate = hwif; 1082 hwif->serialized = hwif->mate->serialized = 1; 1083 goto obsolete_option; 1084 1085 case -1: 1086 case 0: 1087 case 1: 1088 case 2: 1089 case 3: 1090 goto bad_option; 1091 default: 1092 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n"); 1093 return 1; 1094 } 1095 } 1096bad_option: 1097 printk(" -- BAD OPTION\n"); 1098 return 1; 1099obsolete_option: 1100 printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n"); 1101 return 1; 1102bad_hwif: 1103 printk("-- NOT SUPPORTED ON ide%d", hw); 1104done: 1105 printk("\n"); 1106 return 1; 1107} 1108 1109EXPORT_SYMBOL(ide_lock); 1110 1111static int ide_bus_match(struct device *dev, struct device_driver *drv) 1112{ 1113 return 1; 1114} 1115 1116static char *media_string(ide_drive_t *drive) 1117{ 1118 switch (drive->media) { 1119 case ide_disk: 1120 return "disk"; 1121 case ide_cdrom: 1122 return "cdrom"; 1123 case ide_tape: 1124 return "tape"; 1125 case ide_floppy: 1126 return "floppy"; 1127 case ide_optical: 1128 return "optical"; 1129 default: 1130 return "UNKNOWN"; 1131 } 1132} 1133 1134static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf) 1135{ 1136 ide_drive_t *drive = to_ide_device(dev); 1137 return sprintf(buf, "%s\n", media_string(drive)); 1138} 1139 1140static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf) 1141{ 1142 ide_drive_t *drive = to_ide_device(dev); 1143 return sprintf(buf, "%s\n", drive->name); 1144} 1145 1146static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) 1147{ 1148 ide_drive_t *drive = to_ide_device(dev); 1149 return sprintf(buf, "ide:m-%s\n", media_string(drive)); 1150} 1151 1152static ssize_t model_show(struct device *dev, struct device_attribute *attr, 1153 char *buf) 1154{ 1155 ide_drive_t *drive = to_ide_device(dev); 1156 return sprintf(buf, "%s\n", drive->id->model); 1157} 1158 1159static ssize_t firmware_show(struct device *dev, struct device_attribute *attr, 1160 char *buf) 1161{ 1162 ide_drive_t *drive = to_ide_device(dev); 1163 return sprintf(buf, "%s\n", drive->id->fw_rev); 1164} 1165 1166static ssize_t serial_show(struct device *dev, struct device_attribute *attr, 1167 char *buf) 1168{ 1169 ide_drive_t *drive = to_ide_device(dev); 1170 return sprintf(buf, "%s\n", drive->id->serial_no); 1171} 1172 1173static struct device_attribute ide_dev_attrs[] = { 1174 __ATTR_RO(media), 1175 __ATTR_RO(drivename), 1176 __ATTR_RO(modalias), 1177 __ATTR_RO(model), 1178 __ATTR_RO(firmware), 1179 __ATTR(serial, 0400, serial_show, NULL), 1180 __ATTR_NULL 1181}; 1182 1183static int ide_uevent(struct device *dev, struct kobj_uevent_env *env) 1184{ 1185 ide_drive_t *drive = to_ide_device(dev); 1186 1187 add_uevent_var(env, "MEDIA=%s", media_string(drive)); 1188 add_uevent_var(env, "DRIVENAME=%s", drive->name); 1189 add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive)); 1190 return 0; 1191} 1192 1193static int generic_ide_probe(struct device *dev) 1194{ 1195 ide_drive_t *drive = to_ide_device(dev); 1196 ide_driver_t *drv = to_ide_driver(dev->driver); 1197 1198 return drv->probe ? drv->probe(drive) : -ENODEV; 1199} 1200 1201static int generic_ide_remove(struct device *dev) 1202{ 1203 ide_drive_t *drive = to_ide_device(dev); 1204 ide_driver_t *drv = to_ide_driver(dev->driver); 1205 1206 if (drv->remove) 1207 drv->remove(drive); 1208 1209 return 0; 1210} 1211 1212static void generic_ide_shutdown(struct device *dev) 1213{ 1214 ide_drive_t *drive = to_ide_device(dev); 1215 ide_driver_t *drv = to_ide_driver(dev->driver); 1216 1217 if (dev->driver && drv->shutdown) 1218 drv->shutdown(drive); 1219} 1220 1221struct bus_type ide_bus_type = { 1222 .name = "ide", 1223 .match = ide_bus_match, 1224 .uevent = ide_uevent, 1225 .probe = generic_ide_probe, 1226 .remove = generic_ide_remove, 1227 .shutdown = generic_ide_shutdown, 1228 .dev_attrs = ide_dev_attrs, 1229 .suspend = generic_ide_suspend, 1230 .resume = generic_ide_resume, 1231}; 1232 1233EXPORT_SYMBOL_GPL(ide_bus_type); 1234 1235static void ide_port_class_release(struct device *portdev) 1236{ 1237 ide_hwif_t *hwif = dev_get_drvdata(portdev); 1238 1239 put_device(&hwif->gendev); 1240} 1241 1242/* 1243 * This is gets invoked once during initialization, to set *everything* up 1244 */ 1245static int __init ide_init(void) 1246{ 1247 int ret; 1248 1249 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n"); 1250 system_bus_speed = ide_system_bus_speed(); 1251 1252 printk(KERN_INFO "ide: Assuming %dMHz system bus speed " 1253 "for PIO modes%s\n", system_bus_speed, 1254 idebus_parameter ? "" : "; override with idebus=xx"); 1255 1256 ret = bus_register(&ide_bus_type); 1257 if (ret < 0) { 1258 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret); 1259 return ret; 1260 } 1261 1262 ide_port_class = class_create(THIS_MODULE, "ide_port"); 1263 if (IS_ERR(ide_port_class)) { 1264 ret = PTR_ERR(ide_port_class); 1265 goto out_port_class; 1266 } 1267 ide_port_class->dev_release = ide_port_class_release; 1268 1269 init_ide_data(); 1270 1271 proc_ide_create(); 1272 1273 return 0; 1274 1275out_port_class: 1276 bus_unregister(&ide_bus_type); 1277 1278 return ret; 1279} 1280 1281#ifdef MODULE 1282static char *options = NULL; 1283module_param(options, charp, 0); 1284MODULE_LICENSE("GPL"); 1285 1286static void __init parse_options (char *line) 1287{ 1288 char *next = line; 1289 1290 if (line == NULL || !*line) 1291 return; 1292 while ((line = next) != NULL) { 1293 if ((next = strchr(line,' ')) != NULL) 1294 *next++ = 0; 1295 if (!ide_setup(line)) 1296 printk (KERN_INFO "Unknown option '%s'\n", line); 1297 } 1298} 1299 1300int __init init_module (void) 1301{ 1302 parse_options(options); 1303 return ide_init(); 1304} 1305 1306void __exit cleanup_module (void) 1307{ 1308 int index; 1309 1310 for (index = 0; index < MAX_HWIFS; ++index) 1311 ide_unregister(index); 1312 1313 proc_ide_destroy(); 1314 1315 class_destroy(ide_port_class); 1316 1317 bus_unregister(&ide_bus_type); 1318} 1319 1320#else /* !MODULE */ 1321 1322__setup("", ide_setup); 1323 1324module_init(ide_init); 1325 1326#endif /* MODULE */ 1327