ide.c revision d083c03f2524af699a6b85cf4d2f8090242b1b84
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 230static struct resource* hwif_request_region(ide_hwif_t *hwif, 231 unsigned long addr, int num) 232{ 233 struct resource *res = request_region(addr, num, hwif->name); 234 235 if (!res) 236 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n", 237 hwif->name, addr, addr+num-1); 238 return res; 239} 240 241/** 242 * ide_hwif_request_regions - request resources for IDE 243 * @hwif: interface to use 244 * 245 * Requests all the needed resources for an interface. 246 * Right now core IDE code does this work which is deeply wrong. 247 * MMIO leaves it to the controller driver, 248 * PIO will migrate this way over time. 249 */ 250 251int ide_hwif_request_regions(ide_hwif_t *hwif) 252{ 253 unsigned long addr; 254 255 if (hwif->mmio) 256 return 0; 257 258 addr = hwif->io_ports[IDE_CONTROL_OFFSET]; 259 260 if (addr && !hwif_request_region(hwif, addr, 1)) 261 goto control_region_busy; 262 263 addr = hwif->io_ports[IDE_DATA_OFFSET]; 264 BUG_ON((addr | 7) != hwif->io_ports[IDE_STATUS_OFFSET]); 265 266 if (!hwif_request_region(hwif, addr, 8)) 267 goto data_region_busy; 268 269 return 0; 270 271data_region_busy: 272 addr = hwif->io_ports[IDE_CONTROL_OFFSET]; 273 if (addr) 274 release_region(addr, 1); 275control_region_busy: 276 /* If any errors are return, we drop the hwif interface. */ 277 return -EBUSY; 278} 279 280void ide_remove_port_from_hwgroup(ide_hwif_t *hwif) 281{ 282 ide_hwgroup_t *hwgroup = hwif->hwgroup; 283 284 spin_lock_irq(&ide_lock); 285 /* 286 * Remove us from the hwgroup, and free 287 * the hwgroup if we were the only member 288 */ 289 if (hwif->next == hwif) { 290 BUG_ON(hwgroup->hwif != hwif); 291 kfree(hwgroup); 292 } else { 293 /* There is another interface in hwgroup. 294 * Unlink us, and set hwgroup->drive and ->hwif to 295 * something sane. 296 */ 297 ide_hwif_t *g = hwgroup->hwif; 298 299 while (g->next != hwif) 300 g = g->next; 301 g->next = hwif->next; 302 if (hwgroup->hwif == hwif) { 303 /* Chose a random hwif for hwgroup->hwif. 304 * It's guaranteed that there are no drives 305 * left in the hwgroup. 306 */ 307 BUG_ON(hwgroup->drive != NULL); 308 hwgroup->hwif = g; 309 } 310 BUG_ON(hwgroup->hwif == hwif); 311 } 312 spin_unlock_irq(&ide_lock); 313} 314 315/* Called with ide_lock held. */ 316static void __ide_port_unregister_devices(ide_hwif_t *hwif) 317{ 318 int i; 319 320 for (i = 0; i < MAX_DRIVES; i++) { 321 ide_drive_t *drive = &hwif->drives[i]; 322 323 if (drive->present) { 324 spin_unlock_irq(&ide_lock); 325 device_unregister(&drive->gendev); 326 wait_for_completion(&drive->gendev_rel_comp); 327 spin_lock_irq(&ide_lock); 328 } 329 } 330} 331 332void ide_port_unregister_devices(ide_hwif_t *hwif) 333{ 334 mutex_lock(&ide_cfg_mtx); 335 spin_lock_irq(&ide_lock); 336 __ide_port_unregister_devices(hwif); 337 hwif->present = 0; 338 ide_port_init_devices_data(hwif); 339 spin_unlock_irq(&ide_lock); 340 mutex_unlock(&ide_cfg_mtx); 341} 342EXPORT_SYMBOL_GPL(ide_port_unregister_devices); 343 344/** 345 * ide_unregister - free an IDE interface 346 * @index: index of interface (will change soon to a pointer) 347 * 348 * Perform the final unregister of an IDE interface. At the moment 349 * we don't refcount interfaces so this will also get split up. 350 * 351 * Locking: 352 * The caller must not hold the IDE locks 353 * The drive present/vanishing is not yet properly locked 354 * Take care with the callbacks. These have been split to avoid 355 * deadlocking the IDE layer. The shutdown callback is called 356 * before we take the lock and free resources. It is up to the 357 * caller to be sure there is no pending I/O here, and that 358 * the interface will not be reopened (present/vanishing locking 359 * isn't yet done BTW). After we commit to the final kill we 360 * call the cleanup callback with the ide locks held. 361 * 362 * Unregister restores the hwif structures to the default state. 363 * This is raving bonkers. 364 */ 365 366void ide_unregister(unsigned int index) 367{ 368 ide_hwif_t *hwif, *g; 369 ide_hwgroup_t *hwgroup; 370 int irq_count = 0; 371 372 BUG_ON(index >= MAX_HWIFS); 373 374 BUG_ON(in_interrupt()); 375 BUG_ON(irqs_disabled()); 376 mutex_lock(&ide_cfg_mtx); 377 spin_lock_irq(&ide_lock); 378 hwif = &ide_hwifs[index]; 379 if (!hwif->present) 380 goto abort; 381 __ide_port_unregister_devices(hwif); 382 hwif->present = 0; 383 384 spin_unlock_irq(&ide_lock); 385 386 ide_proc_unregister_port(hwif); 387 388 hwgroup = hwif->hwgroup; 389 /* 390 * free the irq if we were the only hwif using it 391 */ 392 g = hwgroup->hwif; 393 do { 394 if (g->irq == hwif->irq) 395 ++irq_count; 396 g = g->next; 397 } while (g != hwgroup->hwif); 398 if (irq_count == 1) 399 free_irq(hwif->irq, hwgroup); 400 401 ide_remove_port_from_hwgroup(hwif); 402 403 device_unregister(hwif->portdev); 404 device_unregister(&hwif->gendev); 405 wait_for_completion(&hwif->gendev_rel_comp); 406 407 /* 408 * Remove us from the kernel's knowledge 409 */ 410 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS); 411 kfree(hwif->sg_table); 412 unregister_blkdev(hwif->major, hwif->name); 413 spin_lock_irq(&ide_lock); 414 415 if (hwif->dma_base) 416 (void)ide_release_dma(hwif); 417 418 /* restore hwif data to pristine status */ 419 ide_init_port_data(hwif, index); 420 421abort: 422 spin_unlock_irq(&ide_lock); 423 mutex_unlock(&ide_cfg_mtx); 424} 425 426EXPORT_SYMBOL(ide_unregister); 427 428void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw) 429{ 430 memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports)); 431 hwif->irq = hw->irq; 432 hwif->chipset = hw->chipset; 433 hwif->gendev.parent = hw->dev; 434 hwif->ack_intr = hw->ack_intr; 435} 436EXPORT_SYMBOL_GPL(ide_init_port_hw); 437 438/* 439 * Locks for IDE setting functionality 440 */ 441 442DEFINE_MUTEX(ide_setting_mtx); 443 444EXPORT_SYMBOL_GPL(ide_setting_mtx); 445 446/** 447 * ide_spin_wait_hwgroup - wait for group 448 * @drive: drive in the group 449 * 450 * Wait for an IDE device group to go non busy and then return 451 * holding the ide_lock which guards the hwgroup->busy status 452 * and right to use it. 453 */ 454 455int ide_spin_wait_hwgroup (ide_drive_t *drive) 456{ 457 ide_hwgroup_t *hwgroup = HWGROUP(drive); 458 unsigned long timeout = jiffies + (3 * HZ); 459 460 spin_lock_irq(&ide_lock); 461 462 while (hwgroup->busy) { 463 unsigned long lflags; 464 spin_unlock_irq(&ide_lock); 465 local_irq_set(lflags); 466 if (time_after(jiffies, timeout)) { 467 local_irq_restore(lflags); 468 printk(KERN_ERR "%s: channel busy\n", drive->name); 469 return -EBUSY; 470 } 471 local_irq_restore(lflags); 472 spin_lock_irq(&ide_lock); 473 } 474 return 0; 475} 476 477EXPORT_SYMBOL(ide_spin_wait_hwgroup); 478 479int set_io_32bit(ide_drive_t *drive, int arg) 480{ 481 if (drive->no_io_32bit) 482 return -EPERM; 483 484 if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1)) 485 return -EINVAL; 486 487 if (ide_spin_wait_hwgroup(drive)) 488 return -EBUSY; 489 490 drive->io_32bit = arg; 491 492 spin_unlock_irq(&ide_lock); 493 494 return 0; 495} 496 497static int set_ksettings(ide_drive_t *drive, int arg) 498{ 499 if (arg < 0 || arg > 1) 500 return -EINVAL; 501 502 if (ide_spin_wait_hwgroup(drive)) 503 return -EBUSY; 504 drive->keep_settings = arg; 505 spin_unlock_irq(&ide_lock); 506 507 return 0; 508} 509 510int set_using_dma(ide_drive_t *drive, int arg) 511{ 512#ifdef CONFIG_BLK_DEV_IDEDMA 513 ide_hwif_t *hwif = drive->hwif; 514 int err = -EPERM; 515 516 if (arg < 0 || arg > 1) 517 return -EINVAL; 518 519 if (!drive->id || !(drive->id->capability & 1)) 520 goto out; 521 522 if (hwif->dma_host_set == NULL) 523 goto out; 524 525 err = -EBUSY; 526 if (ide_spin_wait_hwgroup(drive)) 527 goto out; 528 /* 529 * set ->busy flag, unlock and let it ride 530 */ 531 hwif->hwgroup->busy = 1; 532 spin_unlock_irq(&ide_lock); 533 534 err = 0; 535 536 if (arg) { 537 if (ide_set_dma(drive)) 538 err = -EIO; 539 } else 540 ide_dma_off(drive); 541 542 /* 543 * lock, clear ->busy flag and unlock before leaving 544 */ 545 spin_lock_irq(&ide_lock); 546 hwif->hwgroup->busy = 0; 547 spin_unlock_irq(&ide_lock); 548out: 549 return err; 550#else 551 if (arg < 0 || arg > 1) 552 return -EINVAL; 553 554 return -EPERM; 555#endif 556} 557 558int set_pio_mode(ide_drive_t *drive, int arg) 559{ 560 struct request rq; 561 ide_hwif_t *hwif = drive->hwif; 562 const struct ide_port_ops *port_ops = hwif->port_ops; 563 564 if (arg < 0 || arg > 255) 565 return -EINVAL; 566 567 if (port_ops == NULL || port_ops->set_pio_mode == NULL || 568 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) 569 return -ENOSYS; 570 571 if (drive->special.b.set_tune) 572 return -EBUSY; 573 574 ide_init_drive_cmd(&rq); 575 rq.cmd_type = REQ_TYPE_ATA_TASKFILE; 576 577 drive->tune_req = (u8) arg; 578 drive->special.b.set_tune = 1; 579 (void) ide_do_drive_cmd(drive, &rq, ide_wait); 580 return 0; 581} 582 583static int set_unmaskirq(ide_drive_t *drive, int arg) 584{ 585 if (drive->no_unmask) 586 return -EPERM; 587 588 if (arg < 0 || arg > 1) 589 return -EINVAL; 590 591 if (ide_spin_wait_hwgroup(drive)) 592 return -EBUSY; 593 drive->unmask = arg; 594 spin_unlock_irq(&ide_lock); 595 596 return 0; 597} 598 599/** 600 * system_bus_clock - clock guess 601 * 602 * External version of the bus clock guess used by very old IDE drivers 603 * for things like VLB timings. Should not be used. 604 */ 605 606int system_bus_clock (void) 607{ 608 return system_bus_speed; 609} 610 611EXPORT_SYMBOL(system_bus_clock); 612 613static int generic_ide_suspend(struct device *dev, pm_message_t mesg) 614{ 615 ide_drive_t *drive = dev->driver_data; 616 ide_hwif_t *hwif = HWIF(drive); 617 struct request rq; 618 struct request_pm_state rqpm; 619 ide_task_t args; 620 int ret; 621 622 /* Call ACPI _GTM only once */ 623 if (!(drive->dn % 2)) 624 ide_acpi_get_timing(hwif); 625 626 memset(&rq, 0, sizeof(rq)); 627 memset(&rqpm, 0, sizeof(rqpm)); 628 memset(&args, 0, sizeof(args)); 629 rq.cmd_type = REQ_TYPE_PM_SUSPEND; 630 rq.special = &args; 631 rq.data = &rqpm; 632 rqpm.pm_step = ide_pm_state_start_suspend; 633 if (mesg.event == PM_EVENT_PRETHAW) 634 mesg.event = PM_EVENT_FREEZE; 635 rqpm.pm_state = mesg.event; 636 637 ret = ide_do_drive_cmd(drive, &rq, ide_wait); 638 /* only call ACPI _PS3 after both drivers are suspended */ 639 if (!ret && (((drive->dn % 2) && hwif->drives[0].present 640 && hwif->drives[1].present) 641 || !hwif->drives[0].present 642 || !hwif->drives[1].present)) 643 ide_acpi_set_state(hwif, 0); 644 return ret; 645} 646 647static int generic_ide_resume(struct device *dev) 648{ 649 ide_drive_t *drive = dev->driver_data; 650 ide_hwif_t *hwif = HWIF(drive); 651 struct request rq; 652 struct request_pm_state rqpm; 653 ide_task_t args; 654 int err; 655 656 /* Call ACPI _STM only once */ 657 if (!(drive->dn % 2)) { 658 ide_acpi_set_state(hwif, 1); 659 ide_acpi_push_timing(hwif); 660 } 661 662 ide_acpi_exec_tfs(drive); 663 664 memset(&rq, 0, sizeof(rq)); 665 memset(&rqpm, 0, sizeof(rqpm)); 666 memset(&args, 0, sizeof(args)); 667 rq.cmd_type = REQ_TYPE_PM_RESUME; 668 rq.special = &args; 669 rq.data = &rqpm; 670 rqpm.pm_step = ide_pm_state_start_resume; 671 rqpm.pm_state = PM_EVENT_ON; 672 673 err = ide_do_drive_cmd(drive, &rq, ide_head_wait); 674 675 if (err == 0 && dev->driver) { 676 ide_driver_t *drv = to_ide_driver(dev->driver); 677 678 if (drv->resume) 679 drv->resume(drive); 680 } 681 682 return err; 683} 684 685int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev, 686 unsigned int cmd, unsigned long arg) 687{ 688 unsigned long flags; 689 ide_driver_t *drv; 690 void __user *p = (void __user *)arg; 691 int err = 0, (*setfunc)(ide_drive_t *, int); 692 u8 *val; 693 694 switch (cmd) { 695 case HDIO_GET_32BIT: val = &drive->io_32bit; goto read_val; 696 case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val; 697 case HDIO_GET_UNMASKINTR: val = &drive->unmask; goto read_val; 698 case HDIO_GET_DMA: val = &drive->using_dma; goto read_val; 699 case HDIO_SET_32BIT: setfunc = set_io_32bit; goto set_val; 700 case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings; goto set_val; 701 case HDIO_SET_PIO_MODE: setfunc = set_pio_mode; goto set_val; 702 case HDIO_SET_UNMASKINTR: setfunc = set_unmaskirq; goto set_val; 703 case HDIO_SET_DMA: setfunc = set_using_dma; goto set_val; 704 } 705 706 switch (cmd) { 707 case HDIO_OBSOLETE_IDENTITY: 708 case HDIO_GET_IDENTITY: 709 if (bdev != bdev->bd_contains) 710 return -EINVAL; 711 if (drive->id_read == 0) 712 return -ENOMSG; 713 if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142)) 714 return -EFAULT; 715 return 0; 716 717 case HDIO_GET_NICE: 718 return put_user(drive->dsc_overlap << IDE_NICE_DSC_OVERLAP | 719 drive->atapi_overlap << IDE_NICE_ATAPI_OVERLAP | 720 drive->nice1 << IDE_NICE_1, 721 (long __user *) arg); 722#ifdef CONFIG_IDE_TASK_IOCTL 723 case HDIO_DRIVE_TASKFILE: 724 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 725 return -EACCES; 726 switch(drive->media) { 727 case ide_disk: 728 return ide_taskfile_ioctl(drive, cmd, arg); 729 default: 730 return -ENOMSG; 731 } 732#endif /* CONFIG_IDE_TASK_IOCTL */ 733 734 case HDIO_DRIVE_CMD: 735 if (!capable(CAP_SYS_RAWIO)) 736 return -EACCES; 737 return ide_cmd_ioctl(drive, cmd, arg); 738 739 case HDIO_DRIVE_TASK: 740 if (!capable(CAP_SYS_RAWIO)) 741 return -EACCES; 742 return ide_task_ioctl(drive, cmd, arg); 743 case HDIO_SET_NICE: 744 if (!capable(CAP_SYS_ADMIN)) return -EACCES; 745 if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1)))) 746 return -EPERM; 747 drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1; 748 drv = *(ide_driver_t **)bdev->bd_disk->private_data; 749 if (drive->dsc_overlap && !drv->supports_dsc_overlap) { 750 drive->dsc_overlap = 0; 751 return -EPERM; 752 } 753 drive->nice1 = (arg >> IDE_NICE_1) & 1; 754 return 0; 755 case HDIO_DRIVE_RESET: 756 if (!capable(CAP_SYS_ADMIN)) 757 return -EACCES; 758 759 /* 760 * Abort the current command on the 761 * group if there is one, taking 762 * care not to allow anything else 763 * to be queued and to die on the 764 * spot if we miss one somehow 765 */ 766 767 spin_lock_irqsave(&ide_lock, flags); 768 769 if (HWGROUP(drive)->resetting) { 770 spin_unlock_irqrestore(&ide_lock, flags); 771 return -EBUSY; 772 } 773 774 ide_abort(drive, "drive reset"); 775 776 BUG_ON(HWGROUP(drive)->handler); 777 778 /* Ensure nothing gets queued after we 779 drop the lock. Reset will clear the busy */ 780 781 HWGROUP(drive)->busy = 1; 782 spin_unlock_irqrestore(&ide_lock, flags); 783 (void) ide_do_reset(drive); 784 785 return 0; 786 case HDIO_GET_BUSSTATE: 787 if (!capable(CAP_SYS_ADMIN)) 788 return -EACCES; 789 if (put_user(HWIF(drive)->bus_state, (long __user *)arg)) 790 return -EFAULT; 791 return 0; 792 793 case HDIO_SET_BUSSTATE: 794 if (!capable(CAP_SYS_ADMIN)) 795 return -EACCES; 796 return -EOPNOTSUPP; 797 default: 798 return -EINVAL; 799 } 800 801read_val: 802 mutex_lock(&ide_setting_mtx); 803 spin_lock_irqsave(&ide_lock, flags); 804 err = *val; 805 spin_unlock_irqrestore(&ide_lock, flags); 806 mutex_unlock(&ide_setting_mtx); 807 return err >= 0 ? put_user(err, (long __user *)arg) : err; 808 809set_val: 810 if (bdev != bdev->bd_contains) 811 err = -EINVAL; 812 else { 813 if (!capable(CAP_SYS_ADMIN)) 814 err = -EACCES; 815 else { 816 mutex_lock(&ide_setting_mtx); 817 err = setfunc(drive, arg); 818 mutex_unlock(&ide_setting_mtx); 819 } 820 } 821 return err; 822} 823 824EXPORT_SYMBOL(generic_ide_ioctl); 825 826/* 827 * stridx() returns the offset of c within s, 828 * or -1 if c is '\0' or not found within s. 829 */ 830static int __init stridx (const char *s, char c) 831{ 832 char *i = strchr(s, c); 833 return (i && c) ? i - s : -1; 834} 835 836/* 837 * match_parm() does parsing for ide_setup(): 838 * 839 * 1. the first char of s must be '='. 840 * 2. if the remainder matches one of the supplied keywords, 841 * the index (1 based) of the keyword is negated and returned. 842 * 3. if the remainder is a series of no more than max_vals numbers 843 * separated by commas, the numbers are saved in vals[] and a 844 * count of how many were saved is returned. Base10 is assumed, 845 * and base16 is allowed when prefixed with "0x". 846 * 4. otherwise, zero is returned. 847 */ 848static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals) 849{ 850 static const char *decimal = "0123456789"; 851 static const char *hex = "0123456789abcdef"; 852 int i, n; 853 854 if (*s++ == '=') { 855 /* 856 * Try matching against the supplied keywords, 857 * and return -(index+1) if we match one 858 */ 859 if (keywords != NULL) { 860 for (i = 0; *keywords != NULL; ++i) { 861 if (!strcmp(s, *keywords++)) 862 return -(i+1); 863 } 864 } 865 /* 866 * Look for a series of no more than "max_vals" 867 * numeric values separated by commas, in base10, 868 * or base16 when prefixed with "0x". 869 * Return a count of how many were found. 870 */ 871 for (n = 0; (i = stridx(decimal, *s)) >= 0;) { 872 vals[n] = i; 873 while ((i = stridx(decimal, *++s)) >= 0) 874 vals[n] = (vals[n] * 10) + i; 875 if (*s == 'x' && !vals[n]) { 876 while ((i = stridx(hex, *++s)) >= 0) 877 vals[n] = (vals[n] * 0x10) + i; 878 } 879 if (++n == max_vals) 880 break; 881 if (*s == ',' || *s == ';') 882 ++s; 883 } 884 if (!*s) 885 return n; 886 } 887 return 0; /* zero = nothing matched */ 888} 889 890extern int probe_ali14xx; 891extern int probe_umc8672; 892extern int probe_dtc2278; 893extern int probe_ht6560b; 894extern int probe_qd65xx; 895extern int cmd640_vlb; 896extern int probe_4drives; 897 898static int __initdata is_chipset_set; 899 900/* 901 * ide_setup() gets called VERY EARLY during initialization, 902 * to handle kernel "command line" strings beginning with "hdx=" or "ide". 903 * 904 * Remember to update Documentation/ide/ide.txt if you change something here. 905 */ 906static int __init ide_setup(char *s) 907{ 908 int i, vals[3]; 909 ide_hwif_t *hwif; 910 ide_drive_t *drive; 911 unsigned int hw, unit; 912 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1); 913 const char max_hwif = '0' + (MAX_HWIFS - 1); 914 915 916 if (strncmp(s,"hd",2) == 0 && s[2] == '=') /* hd= is for hd.c */ 917 return 0; /* driver and not us */ 918 919 if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2)) 920 return 0; 921 922 printk(KERN_INFO "ide_setup: %s", s); 923 init_ide_data (); 924 925#ifdef CONFIG_BLK_DEV_IDEDOUBLER 926 if (!strcmp(s, "ide=doubler")) { 927 extern int ide_doubler; 928 929 printk(" : Enabled support for IDE doublers\n"); 930 ide_doubler = 1; 931 return 1; 932 } 933#endif /* CONFIG_BLK_DEV_IDEDOUBLER */ 934 935 if (!strcmp(s, "ide=nodma")) { 936 printk(" : Prevented DMA\n"); 937 noautodma = 1; 938 goto obsolete_option; 939 } 940 941#ifdef CONFIG_BLK_DEV_IDEACPI 942 if (!strcmp(s, "ide=noacpi")) { 943 //printk(" : Disable IDE ACPI support.\n"); 944 ide_noacpi = 1; 945 return 1; 946 } 947 if (!strcmp(s, "ide=acpigtf")) { 948 //printk(" : Enable IDE ACPI _GTF support.\n"); 949 ide_noacpitfs = 0; 950 return 1; 951 } 952 if (!strcmp(s, "ide=acpionboot")) { 953 //printk(" : Call IDE ACPI methods on boot.\n"); 954 ide_noacpionboot = 0; 955 return 1; 956 } 957#endif /* CONFIG_BLK_DEV_IDEACPI */ 958 959 /* 960 * Look for drive options: "hdx=" 961 */ 962 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) { 963 const char *hd_words[] = { 964 "none", "noprobe", "nowerr", "cdrom", "nodma", 965 "autotune", "noautotune", "-8", "-9", "-10", 966 "noflush", "remap", "remap63", "scsi", NULL }; 967 unit = s[2] - 'a'; 968 hw = unit / MAX_DRIVES; 969 unit = unit % MAX_DRIVES; 970 hwif = &ide_hwifs[hw]; 971 drive = &hwif->drives[unit]; 972 if (strncmp(s + 4, "ide-", 4) == 0) { 973 strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req)); 974 goto obsolete_option; 975 } 976 switch (match_parm(&s[3], hd_words, vals, 3)) { 977 case -1: /* "none" */ 978 case -2: /* "noprobe" */ 979 drive->noprobe = 1; 980 goto done; 981 case -3: /* "nowerr" */ 982 drive->bad_wstat = BAD_R_STAT; 983 goto done; 984 case -4: /* "cdrom" */ 985 drive->present = 1; 986 drive->media = ide_cdrom; 987 /* an ATAPI device ignores DRDY */ 988 drive->ready_stat = 0; 989 goto done; 990 case -5: /* nodma */ 991 drive->nodma = 1; 992 goto done; 993 case -6: /* "autotune" */ 994 drive->autotune = IDE_TUNE_AUTO; 995 goto obsolete_option; 996 case -7: /* "noautotune" */ 997 drive->autotune = IDE_TUNE_NOAUTO; 998 goto obsolete_option; 999 case -11: /* noflush */ 1000 drive->noflush = 1; 1001 goto done; 1002 case -12: /* "remap" */ 1003 drive->remap_0_to_1 = 1; 1004 goto obsolete_option; 1005 case -13: /* "remap63" */ 1006 drive->sect0 = 63; 1007 goto obsolete_option; 1008 case -14: /* "scsi" */ 1009 drive->scsi = 1; 1010 goto obsolete_option; 1011 case 3: /* cyl,head,sect */ 1012 drive->media = ide_disk; 1013 drive->ready_stat = READY_STAT; 1014 drive->cyl = drive->bios_cyl = vals[0]; 1015 drive->head = drive->bios_head = vals[1]; 1016 drive->sect = drive->bios_sect = vals[2]; 1017 drive->present = 1; 1018 drive->forced_geom = 1; 1019 goto done; 1020 default: 1021 goto bad_option; 1022 } 1023 } 1024 1025 if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e') 1026 goto bad_option; 1027 /* 1028 * Look for bus speed option: "idebus=" 1029 */ 1030 if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') { 1031 if (match_parm(&s[6], NULL, vals, 1) != 1) 1032 goto bad_option; 1033 if (vals[0] >= 20 && vals[0] <= 66) { 1034 idebus_parameter = vals[0]; 1035 } else 1036 printk(" -- BAD BUS SPEED! Expected value from 20 to 66"); 1037 goto done; 1038 } 1039 /* 1040 * Look for interface options: "idex=" 1041 */ 1042 if (s[3] >= '0' && s[3] <= max_hwif) { 1043 /* 1044 * Be VERY CAREFUL changing this: note hardcoded indexes below 1045 * (-8, -9, -10) are reserved to ease the hardcoding. 1046 */ 1047 static const char *ide_words[] = { 1048 "minus1", "serialize", "minus3", "minus4", 1049 "reset", "minus6", "ata66", "minus8", "minus9", 1050 "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb", 1051 "dtc2278", "umc8672", "ali14xx", NULL }; 1052 1053 hw = s[3] - '0'; 1054 hwif = &ide_hwifs[hw]; 1055 i = match_parm(&s[4], ide_words, vals, 3); 1056 1057 /* 1058 * Cryptic check to ensure chipset not already set for hwif. 1059 * Note: we can't depend on hwif->chipset here. 1060 */ 1061 if (i >= -18 && i <= -11) { 1062 /* chipset already specified */ 1063 if (is_chipset_set) 1064 goto bad_option; 1065 /* these drivers are for "ide0=" only */ 1066 if (hw != 0) 1067 goto bad_hwif; 1068 is_chipset_set = 1; 1069 printk("\n"); 1070 } 1071 1072 switch (i) { 1073#ifdef CONFIG_BLK_DEV_ALI14XX 1074 case -17: /* "ali14xx" */ 1075 probe_ali14xx = 1; 1076 goto obsolete_option; 1077#endif 1078#ifdef CONFIG_BLK_DEV_UMC8672 1079 case -16: /* "umc8672" */ 1080 probe_umc8672 = 1; 1081 goto obsolete_option; 1082#endif 1083#ifdef CONFIG_BLK_DEV_DTC2278 1084 case -15: /* "dtc2278" */ 1085 probe_dtc2278 = 1; 1086 goto obsolete_option; 1087#endif 1088#ifdef CONFIG_BLK_DEV_CMD640 1089 case -14: /* "cmd640_vlb" */ 1090 cmd640_vlb = 1; 1091 goto obsolete_option; 1092#endif 1093#ifdef CONFIG_BLK_DEV_HT6560B 1094 case -13: /* "ht6560b" */ 1095 probe_ht6560b = 1; 1096 goto obsolete_option; 1097#endif 1098#ifdef CONFIG_BLK_DEV_QD65XX 1099 case -12: /* "qd65xx" */ 1100 probe_qd65xx = 1; 1101 goto obsolete_option; 1102#endif 1103#ifdef CONFIG_BLK_DEV_4DRIVES 1104 case -11: /* "four" drives on one set of ports */ 1105 probe_4drives = 1; 1106 goto obsolete_option; 1107#endif 1108 case -10: /* minus10 */ 1109 case -9: /* minus9 */ 1110 case -8: /* minus8 */ 1111 case -6: 1112 case -4: 1113 case -3: 1114 goto bad_option; 1115 case -7: /* ata66 */ 1116#ifdef CONFIG_BLK_DEV_IDEPCI 1117 /* 1118 * Use ATA_CBL_PATA40_SHORT so drive side 1119 * cable detection is also overriden. 1120 */ 1121 hwif->cbl = ATA_CBL_PATA40_SHORT; 1122 goto obsolete_option; 1123#else 1124 goto bad_hwif; 1125#endif 1126 case -5: /* "reset" */ 1127 hwif->reset = 1; 1128 goto obsolete_option; 1129 case -2: /* "serialize" */ 1130 hwif->mate = &ide_hwifs[hw^1]; 1131 hwif->mate->mate = hwif; 1132 hwif->serialized = hwif->mate->serialized = 1; 1133 goto obsolete_option; 1134 1135 case -1: 1136 case 0: 1137 case 1: 1138 case 2: 1139 case 3: 1140 goto bad_option; 1141 default: 1142 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n"); 1143 return 1; 1144 } 1145 } 1146bad_option: 1147 printk(" -- BAD OPTION\n"); 1148 return 1; 1149obsolete_option: 1150 printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n"); 1151 return 1; 1152bad_hwif: 1153 printk("-- NOT SUPPORTED ON ide%d", hw); 1154done: 1155 printk("\n"); 1156 return 1; 1157} 1158 1159EXPORT_SYMBOL(ide_lock); 1160 1161static int ide_bus_match(struct device *dev, struct device_driver *drv) 1162{ 1163 return 1; 1164} 1165 1166static char *media_string(ide_drive_t *drive) 1167{ 1168 switch (drive->media) { 1169 case ide_disk: 1170 return "disk"; 1171 case ide_cdrom: 1172 return "cdrom"; 1173 case ide_tape: 1174 return "tape"; 1175 case ide_floppy: 1176 return "floppy"; 1177 case ide_optical: 1178 return "optical"; 1179 default: 1180 return "UNKNOWN"; 1181 } 1182} 1183 1184static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf) 1185{ 1186 ide_drive_t *drive = to_ide_device(dev); 1187 return sprintf(buf, "%s\n", media_string(drive)); 1188} 1189 1190static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf) 1191{ 1192 ide_drive_t *drive = to_ide_device(dev); 1193 return sprintf(buf, "%s\n", drive->name); 1194} 1195 1196static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) 1197{ 1198 ide_drive_t *drive = to_ide_device(dev); 1199 return sprintf(buf, "ide:m-%s\n", media_string(drive)); 1200} 1201 1202static ssize_t model_show(struct device *dev, struct device_attribute *attr, 1203 char *buf) 1204{ 1205 ide_drive_t *drive = to_ide_device(dev); 1206 return sprintf(buf, "%s\n", drive->id->model); 1207} 1208 1209static ssize_t firmware_show(struct device *dev, struct device_attribute *attr, 1210 char *buf) 1211{ 1212 ide_drive_t *drive = to_ide_device(dev); 1213 return sprintf(buf, "%s\n", drive->id->fw_rev); 1214} 1215 1216static ssize_t serial_show(struct device *dev, struct device_attribute *attr, 1217 char *buf) 1218{ 1219 ide_drive_t *drive = to_ide_device(dev); 1220 return sprintf(buf, "%s\n", drive->id->serial_no); 1221} 1222 1223static struct device_attribute ide_dev_attrs[] = { 1224 __ATTR_RO(media), 1225 __ATTR_RO(drivename), 1226 __ATTR_RO(modalias), 1227 __ATTR_RO(model), 1228 __ATTR_RO(firmware), 1229 __ATTR(serial, 0400, serial_show, NULL), 1230 __ATTR_NULL 1231}; 1232 1233static int ide_uevent(struct device *dev, struct kobj_uevent_env *env) 1234{ 1235 ide_drive_t *drive = to_ide_device(dev); 1236 1237 add_uevent_var(env, "MEDIA=%s", media_string(drive)); 1238 add_uevent_var(env, "DRIVENAME=%s", drive->name); 1239 add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive)); 1240 return 0; 1241} 1242 1243static int generic_ide_probe(struct device *dev) 1244{ 1245 ide_drive_t *drive = to_ide_device(dev); 1246 ide_driver_t *drv = to_ide_driver(dev->driver); 1247 1248 return drv->probe ? drv->probe(drive) : -ENODEV; 1249} 1250 1251static int generic_ide_remove(struct device *dev) 1252{ 1253 ide_drive_t *drive = to_ide_device(dev); 1254 ide_driver_t *drv = to_ide_driver(dev->driver); 1255 1256 if (drv->remove) 1257 drv->remove(drive); 1258 1259 return 0; 1260} 1261 1262static void generic_ide_shutdown(struct device *dev) 1263{ 1264 ide_drive_t *drive = to_ide_device(dev); 1265 ide_driver_t *drv = to_ide_driver(dev->driver); 1266 1267 if (dev->driver && drv->shutdown) 1268 drv->shutdown(drive); 1269} 1270 1271struct bus_type ide_bus_type = { 1272 .name = "ide", 1273 .match = ide_bus_match, 1274 .uevent = ide_uevent, 1275 .probe = generic_ide_probe, 1276 .remove = generic_ide_remove, 1277 .shutdown = generic_ide_shutdown, 1278 .dev_attrs = ide_dev_attrs, 1279 .suspend = generic_ide_suspend, 1280 .resume = generic_ide_resume, 1281}; 1282 1283EXPORT_SYMBOL_GPL(ide_bus_type); 1284 1285static void ide_port_class_release(struct device *portdev) 1286{ 1287 ide_hwif_t *hwif = dev_get_drvdata(portdev); 1288 1289 put_device(&hwif->gendev); 1290} 1291 1292/* 1293 * This is gets invoked once during initialization, to set *everything* up 1294 */ 1295static int __init ide_init(void) 1296{ 1297 int ret; 1298 1299 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n"); 1300 system_bus_speed = ide_system_bus_speed(); 1301 1302 printk(KERN_INFO "ide: Assuming %dMHz system bus speed " 1303 "for PIO modes%s\n", system_bus_speed, 1304 idebus_parameter ? "" : "; override with idebus=xx"); 1305 1306 ret = bus_register(&ide_bus_type); 1307 if (ret < 0) { 1308 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret); 1309 return ret; 1310 } 1311 1312 ide_port_class = class_create(THIS_MODULE, "ide_port"); 1313 if (IS_ERR(ide_port_class)) { 1314 ret = PTR_ERR(ide_port_class); 1315 goto out_port_class; 1316 } 1317 ide_port_class->dev_release = ide_port_class_release; 1318 1319 init_ide_data(); 1320 1321 proc_ide_create(); 1322 1323 return 0; 1324 1325out_port_class: 1326 bus_unregister(&ide_bus_type); 1327 1328 return ret; 1329} 1330 1331#ifdef MODULE 1332static char *options = NULL; 1333module_param(options, charp, 0); 1334MODULE_LICENSE("GPL"); 1335 1336static void __init parse_options (char *line) 1337{ 1338 char *next = line; 1339 1340 if (line == NULL || !*line) 1341 return; 1342 while ((line = next) != NULL) { 1343 if ((next = strchr(line,' ')) != NULL) 1344 *next++ = 0; 1345 if (!ide_setup(line)) 1346 printk (KERN_INFO "Unknown option '%s'\n", line); 1347 } 1348} 1349 1350int __init init_module (void) 1351{ 1352 parse_options(options); 1353 return ide_init(); 1354} 1355 1356void __exit cleanup_module (void) 1357{ 1358 int index; 1359 1360 for (index = 0; index < MAX_HWIFS; ++index) 1361 ide_unregister(index); 1362 1363 proc_ide_destroy(); 1364 1365 class_destroy(ide_port_class); 1366 1367 bus_unregister(&ide_bus_type); 1368} 1369 1370#else /* !MODULE */ 1371 1372__setup("", ide_setup); 1373 1374module_init(ide_init); 1375 1376#endif /* MODULE */ 1377