ide.c revision 73f1ad8670effa9849c3d42457fa2b58f139e013
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} 839 840/* 841 * ide_setup() gets called VERY EARLY during initialization, 842 * to handle kernel "command line" strings beginning with "hdx=" or "ide". 843 * 844 * Remember to update Documentation/ide/ide.txt if you change something here. 845 */ 846static int __init ide_setup(char *s) 847{ 848 ide_hwif_t *hwif; 849 ide_drive_t *drive; 850 unsigned int hw, unit; 851 int vals[3]; 852 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1); 853 854 if (strncmp(s,"hd",2) == 0 && s[2] == '=') /* hd= is for hd.c */ 855 return 0; /* driver and not us */ 856 857 if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2)) 858 return 0; 859 860 printk(KERN_INFO "ide_setup: %s", s); 861 init_ide_data (); 862 863#ifdef CONFIG_BLK_DEV_IDEDOUBLER 864 if (!strcmp(s, "ide=doubler")) { 865 extern int ide_doubler; 866 867 printk(" : Enabled support for IDE doublers\n"); 868 ide_doubler = 1; 869 return 1; 870 } 871#endif /* CONFIG_BLK_DEV_IDEDOUBLER */ 872 873 if (!strcmp(s, "ide=nodma")) { 874 printk(" : Prevented DMA\n"); 875 noautodma = 1; 876 goto obsolete_option; 877 } 878 879#ifdef CONFIG_BLK_DEV_IDEACPI 880 if (!strcmp(s, "ide=noacpi")) { 881 //printk(" : Disable IDE ACPI support.\n"); 882 ide_noacpi = 1; 883 return 1; 884 } 885 if (!strcmp(s, "ide=acpigtf")) { 886 //printk(" : Enable IDE ACPI _GTF support.\n"); 887 ide_noacpitfs = 0; 888 return 1; 889 } 890 if (!strcmp(s, "ide=acpionboot")) { 891 //printk(" : Call IDE ACPI methods on boot.\n"); 892 ide_noacpionboot = 0; 893 return 1; 894 } 895#endif /* CONFIG_BLK_DEV_IDEACPI */ 896 897 /* 898 * Look for drive options: "hdx=" 899 */ 900 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) { 901 const char *hd_words[] = { 902 "none", "noprobe", "nowerr", "cdrom", "nodma", 903 "autotune", "-7", "-8", "-9", "-10", 904 "noflush", "remap", "remap63", "scsi", NULL }; 905 unit = s[2] - 'a'; 906 hw = unit / MAX_DRIVES; 907 unit = unit % MAX_DRIVES; 908 hwif = &ide_hwifs[hw]; 909 drive = &hwif->drives[unit]; 910 if (strncmp(s + 4, "ide-", 4) == 0) { 911 strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req)); 912 goto obsolete_option; 913 } 914 switch (match_parm(&s[3], hd_words, vals, 3)) { 915 case -1: /* "none" */ 916 case -2: /* "noprobe" */ 917 drive->noprobe = 1; 918 goto done; 919 case -3: /* "nowerr" */ 920 drive->bad_wstat = BAD_R_STAT; 921 goto done; 922 case -4: /* "cdrom" */ 923 drive->present = 1; 924 drive->media = ide_cdrom; 925 /* an ATAPI device ignores DRDY */ 926 drive->ready_stat = 0; 927 goto done; 928 case -5: /* nodma */ 929 drive->nodma = 1; 930 goto done; 931 case -6: /* "autotune" */ 932 drive->autotune = 1; 933 goto obsolete_option; 934 case -11: /* noflush */ 935 drive->noflush = 1; 936 goto done; 937 case -12: /* "remap" */ 938 drive->remap_0_to_1 = 1; 939 goto obsolete_option; 940 case -13: /* "remap63" */ 941 drive->sect0 = 63; 942 goto obsolete_option; 943 case -14: /* "scsi" */ 944 drive->scsi = 1; 945 goto obsolete_option; 946 case 3: /* cyl,head,sect */ 947 drive->media = ide_disk; 948 drive->ready_stat = READY_STAT; 949 drive->cyl = drive->bios_cyl = vals[0]; 950 drive->head = drive->bios_head = vals[1]; 951 drive->sect = drive->bios_sect = vals[2]; 952 drive->present = 1; 953 drive->forced_geom = 1; 954 goto done; 955 default: 956 goto bad_option; 957 } 958 } 959 960 if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e') 961 goto bad_option; 962 /* 963 * Look for bus speed option: "idebus=" 964 */ 965 if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') { 966 if (match_parm(&s[6], NULL, vals, 1) != 1) 967 goto bad_option; 968 if (vals[0] >= 20 && vals[0] <= 66) { 969 idebus_parameter = vals[0]; 970 } else 971 printk(" -- BAD BUS SPEED! Expected value from 20 to 66"); 972 goto obsolete_option; 973 } 974 975bad_option: 976 printk(" -- BAD OPTION\n"); 977 return 1; 978obsolete_option: 979 printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n"); 980 return 1; 981done: 982 printk("\n"); 983 return 1; 984} 985 986EXPORT_SYMBOL(ide_lock); 987 988static int ide_bus_match(struct device *dev, struct device_driver *drv) 989{ 990 return 1; 991} 992 993static char *media_string(ide_drive_t *drive) 994{ 995 switch (drive->media) { 996 case ide_disk: 997 return "disk"; 998 case ide_cdrom: 999 return "cdrom"; 1000 case ide_tape: 1001 return "tape"; 1002 case ide_floppy: 1003 return "floppy"; 1004 case ide_optical: 1005 return "optical"; 1006 default: 1007 return "UNKNOWN"; 1008 } 1009} 1010 1011static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf) 1012{ 1013 ide_drive_t *drive = to_ide_device(dev); 1014 return sprintf(buf, "%s\n", media_string(drive)); 1015} 1016 1017static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf) 1018{ 1019 ide_drive_t *drive = to_ide_device(dev); 1020 return sprintf(buf, "%s\n", drive->name); 1021} 1022 1023static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) 1024{ 1025 ide_drive_t *drive = to_ide_device(dev); 1026 return sprintf(buf, "ide:m-%s\n", media_string(drive)); 1027} 1028 1029static ssize_t model_show(struct device *dev, struct device_attribute *attr, 1030 char *buf) 1031{ 1032 ide_drive_t *drive = to_ide_device(dev); 1033 return sprintf(buf, "%s\n", drive->id->model); 1034} 1035 1036static ssize_t firmware_show(struct device *dev, struct device_attribute *attr, 1037 char *buf) 1038{ 1039 ide_drive_t *drive = to_ide_device(dev); 1040 return sprintf(buf, "%s\n", drive->id->fw_rev); 1041} 1042 1043static ssize_t serial_show(struct device *dev, struct device_attribute *attr, 1044 char *buf) 1045{ 1046 ide_drive_t *drive = to_ide_device(dev); 1047 return sprintf(buf, "%s\n", drive->id->serial_no); 1048} 1049 1050static struct device_attribute ide_dev_attrs[] = { 1051 __ATTR_RO(media), 1052 __ATTR_RO(drivename), 1053 __ATTR_RO(modalias), 1054 __ATTR_RO(model), 1055 __ATTR_RO(firmware), 1056 __ATTR(serial, 0400, serial_show, NULL), 1057 __ATTR_NULL 1058}; 1059 1060static int ide_uevent(struct device *dev, struct kobj_uevent_env *env) 1061{ 1062 ide_drive_t *drive = to_ide_device(dev); 1063 1064 add_uevent_var(env, "MEDIA=%s", media_string(drive)); 1065 add_uevent_var(env, "DRIVENAME=%s", drive->name); 1066 add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive)); 1067 return 0; 1068} 1069 1070static int generic_ide_probe(struct device *dev) 1071{ 1072 ide_drive_t *drive = to_ide_device(dev); 1073 ide_driver_t *drv = to_ide_driver(dev->driver); 1074 1075 return drv->probe ? drv->probe(drive) : -ENODEV; 1076} 1077 1078static int generic_ide_remove(struct device *dev) 1079{ 1080 ide_drive_t *drive = to_ide_device(dev); 1081 ide_driver_t *drv = to_ide_driver(dev->driver); 1082 1083 if (drv->remove) 1084 drv->remove(drive); 1085 1086 return 0; 1087} 1088 1089static void generic_ide_shutdown(struct device *dev) 1090{ 1091 ide_drive_t *drive = to_ide_device(dev); 1092 ide_driver_t *drv = to_ide_driver(dev->driver); 1093 1094 if (dev->driver && drv->shutdown) 1095 drv->shutdown(drive); 1096} 1097 1098struct bus_type ide_bus_type = { 1099 .name = "ide", 1100 .match = ide_bus_match, 1101 .uevent = ide_uevent, 1102 .probe = generic_ide_probe, 1103 .remove = generic_ide_remove, 1104 .shutdown = generic_ide_shutdown, 1105 .dev_attrs = ide_dev_attrs, 1106 .suspend = generic_ide_suspend, 1107 .resume = generic_ide_resume, 1108}; 1109 1110EXPORT_SYMBOL_GPL(ide_bus_type); 1111 1112static void ide_port_class_release(struct device *portdev) 1113{ 1114 ide_hwif_t *hwif = dev_get_drvdata(portdev); 1115 1116 put_device(&hwif->gendev); 1117} 1118 1119int ide_vlb_clk; 1120EXPORT_SYMBOL_GPL(ide_vlb_clk); 1121 1122module_param_named(vlb_clock, ide_vlb_clk, int, 0); 1123MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)"); 1124 1125int ide_pci_clk; 1126EXPORT_SYMBOL_GPL(ide_pci_clk); 1127 1128module_param_named(pci_clock, ide_pci_clk, int, 0); 1129MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)"); 1130 1131static unsigned int ide_ignore_cable; 1132 1133static int ide_set_ignore_cable(const char *s, struct kernel_param *kp) 1134{ 1135 int i, j = 1; 1136 1137 if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1) 1138 return -EINVAL; 1139 1140 if (i >= MAX_HWIFS || j < 0 || j > 1) 1141 return -EINVAL; 1142 1143 if (j) 1144 ide_ignore_cable |= (1 << i); 1145 else 1146 ide_ignore_cable &= (1 << i); 1147 1148 return 0; 1149} 1150 1151module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0); 1152MODULE_PARM_DESC(ignore_cable, "ignore cable detection"); 1153 1154void ide_port_apply_params(ide_hwif_t *hwif) 1155{ 1156 if (ide_ignore_cable & (1 << hwif->index)) { 1157 printk(KERN_INFO "ide: ignoring cable detection for %s\n", 1158 hwif->name); 1159 hwif->cbl = ATA_CBL_PATA40_SHORT; 1160 } 1161} 1162 1163/* 1164 * This is gets invoked once during initialization, to set *everything* up 1165 */ 1166static int __init ide_init(void) 1167{ 1168 int ret; 1169 1170 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n"); 1171 system_bus_speed = ide_system_bus_speed(); 1172 1173 printk(KERN_INFO "ide: Assuming %dMHz system bus speed " 1174 "for PIO modes%s\n", system_bus_speed, 1175 idebus_parameter ? "" : "; override with idebus=xx"); 1176 1177 ret = bus_register(&ide_bus_type); 1178 if (ret < 0) { 1179 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret); 1180 return ret; 1181 } 1182 1183 ide_port_class = class_create(THIS_MODULE, "ide_port"); 1184 if (IS_ERR(ide_port_class)) { 1185 ret = PTR_ERR(ide_port_class); 1186 goto out_port_class; 1187 } 1188 ide_port_class->dev_release = ide_port_class_release; 1189 1190 init_ide_data(); 1191 1192 proc_ide_create(); 1193 1194 return 0; 1195 1196out_port_class: 1197 bus_unregister(&ide_bus_type); 1198 1199 return ret; 1200} 1201 1202#ifdef MODULE 1203static char *options = NULL; 1204module_param(options, charp, 0); 1205MODULE_LICENSE("GPL"); 1206 1207static void __init parse_options (char *line) 1208{ 1209 char *next = line; 1210 1211 if (line == NULL || !*line) 1212 return; 1213 while ((line = next) != NULL) { 1214 if ((next = strchr(line,' ')) != NULL) 1215 *next++ = 0; 1216 if (!ide_setup(line)) 1217 printk (KERN_INFO "Unknown option '%s'\n", line); 1218 } 1219} 1220 1221int __init init_module (void) 1222{ 1223 parse_options(options); 1224 return ide_init(); 1225} 1226 1227void __exit cleanup_module (void) 1228{ 1229 int index; 1230 1231 for (index = 0; index < MAX_HWIFS; ++index) 1232 ide_unregister(index); 1233 1234 proc_ide_destroy(); 1235 1236 class_destroy(ide_port_class); 1237 1238 bus_unregister(&ide_bus_type); 1239} 1240 1241#else /* !MODULE */ 1242 1243__setup("", ide_setup); 1244 1245module_init(ide_init); 1246 1247#endif /* MODULE */ 1248