ide.c revision 9fa295e12d490fd571c614b221defaa9212c20dc
1/* 2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below) 3 * Copyright (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#include <linux/module.h> 48#include <linux/types.h> 49#include <linux/string.h> 50#include <linux/kernel.h> 51#include <linux/interrupt.h> 52#include <linux/major.h> 53#include <linux/errno.h> 54#include <linux/genhd.h> 55#include <linux/slab.h> 56#include <linux/init.h> 57#include <linux/pci.h> 58#include <linux/ide.h> 59#include <linux/hdreg.h> 60#include <linux/completion.h> 61#include <linux/device.h> 62 63 64/* default maximum number of failures */ 65#define IDE_DEFAULT_MAX_FAILURES 1 66 67struct class *ide_port_class; 68 69static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR, 70 IDE2_MAJOR, IDE3_MAJOR, 71 IDE4_MAJOR, IDE5_MAJOR, 72 IDE6_MAJOR, IDE7_MAJOR, 73 IDE8_MAJOR, IDE9_MAJOR }; 74 75DEFINE_MUTEX(ide_cfg_mtx); 76 77__cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock); 78EXPORT_SYMBOL(ide_lock); 79 80static void ide_port_init_devices_data(ide_hwif_t *); 81 82/* 83 * Do not even *think* about calling this! 84 */ 85void ide_init_port_data(ide_hwif_t *hwif, unsigned int index) 86{ 87 /* bulk initialize hwif & drive info with zeros */ 88 memset(hwif, 0, sizeof(ide_hwif_t)); 89 90 /* fill in any non-zero initial values */ 91 hwif->index = index; 92 hwif->major = ide_hwif_to_major[index]; 93 94 hwif->name[0] = 'i'; 95 hwif->name[1] = 'd'; 96 hwif->name[2] = 'e'; 97 hwif->name[3] = '0' + index; 98 99 hwif->bus_state = BUSSTATE_ON; 100 101 init_completion(&hwif->gendev_rel_comp); 102 103 hwif->tp_ops = &default_tp_ops; 104 105 ide_port_init_devices_data(hwif); 106} 107 108static void ide_port_init_devices_data(ide_hwif_t *hwif) 109{ 110 int unit; 111 112 for (unit = 0; unit < MAX_DRIVES; ++unit) { 113 ide_drive_t *drive = &hwif->drives[unit]; 114 u8 j = (hwif->index * MAX_DRIVES) + unit; 115 116 memset(drive, 0, sizeof(*drive)); 117 118 drive->media = ide_disk; 119 drive->select.all = (unit<<4)|0xa0; 120 drive->hwif = hwif; 121 drive->ready_stat = ATA_DRDY; 122 drive->bad_wstat = BAD_W_STAT; 123 drive->special.b.recalibrate = 1; 124 drive->special.b.set_geometry = 1; 125 drive->name[0] = 'h'; 126 drive->name[1] = 'd'; 127 drive->name[2] = 'a' + j; 128 drive->max_failures = IDE_DEFAULT_MAX_FAILURES; 129 130 INIT_LIST_HEAD(&drive->list); 131 init_completion(&drive->gendev_rel_comp); 132 } 133} 134 135/* Called with ide_lock held. */ 136static void __ide_port_unregister_devices(ide_hwif_t *hwif) 137{ 138 int i; 139 140 for (i = 0; i < MAX_DRIVES; i++) { 141 ide_drive_t *drive = &hwif->drives[i]; 142 143 if (drive->present) { 144 spin_unlock_irq(&ide_lock); 145 device_unregister(&drive->gendev); 146 wait_for_completion(&drive->gendev_rel_comp); 147 spin_lock_irq(&ide_lock); 148 } 149 } 150} 151 152void ide_port_unregister_devices(ide_hwif_t *hwif) 153{ 154 mutex_lock(&ide_cfg_mtx); 155 spin_lock_irq(&ide_lock); 156 __ide_port_unregister_devices(hwif); 157 hwif->present = 0; 158 ide_port_init_devices_data(hwif); 159 spin_unlock_irq(&ide_lock); 160 mutex_unlock(&ide_cfg_mtx); 161} 162EXPORT_SYMBOL_GPL(ide_port_unregister_devices); 163 164/** 165 * ide_unregister - free an IDE interface 166 * @hwif: IDE interface 167 * 168 * Perform the final unregister of an IDE interface. At the moment 169 * we don't refcount interfaces so this will also get split up. 170 * 171 * Locking: 172 * The caller must not hold the IDE locks 173 * The drive present/vanishing is not yet properly locked 174 * Take care with the callbacks. These have been split to avoid 175 * deadlocking the IDE layer. The shutdown callback is called 176 * before we take the lock and free resources. It is up to the 177 * caller to be sure there is no pending I/O here, and that 178 * the interface will not be reopened (present/vanishing locking 179 * isn't yet done BTW). After we commit to the final kill we 180 * call the cleanup callback with the ide locks held. 181 * 182 * Unregister restores the hwif structures to the default state. 183 * This is raving bonkers. 184 */ 185 186void ide_unregister(ide_hwif_t *hwif) 187{ 188 ide_hwif_t *g; 189 ide_hwgroup_t *hwgroup; 190 int irq_count = 0; 191 192 BUG_ON(in_interrupt()); 193 BUG_ON(irqs_disabled()); 194 195 mutex_lock(&ide_cfg_mtx); 196 197 spin_lock_irq(&ide_lock); 198 if (hwif->present) { 199 __ide_port_unregister_devices(hwif); 200 hwif->present = 0; 201 } 202 spin_unlock_irq(&ide_lock); 203 204 ide_proc_unregister_port(hwif); 205 206 hwgroup = hwif->hwgroup; 207 /* 208 * free the irq if we were the only hwif using it 209 */ 210 g = hwgroup->hwif; 211 do { 212 if (g->irq == hwif->irq) 213 ++irq_count; 214 g = g->next; 215 } while (g != hwgroup->hwif); 216 if (irq_count == 1) 217 free_irq(hwif->irq, hwgroup); 218 219 ide_remove_port_from_hwgroup(hwif); 220 221 device_unregister(hwif->portdev); 222 device_unregister(&hwif->gendev); 223 wait_for_completion(&hwif->gendev_rel_comp); 224 225 /* 226 * Remove us from the kernel's knowledge 227 */ 228 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS); 229 kfree(hwif->sg_table); 230 unregister_blkdev(hwif->major, hwif->name); 231 232 if (hwif->dma_base) 233 ide_release_dma_engine(hwif); 234 235 mutex_unlock(&ide_cfg_mtx); 236} 237 238void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw) 239{ 240 memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports)); 241 hwif->irq = hw->irq; 242 hwif->chipset = hw->chipset; 243 hwif->dev = hw->dev; 244 hwif->gendev.parent = hw->parent ? hw->parent : hw->dev; 245 hwif->ack_intr = hw->ack_intr; 246 hwif->config_data = hw->config; 247} 248 249/* 250 * Locks for IDE setting functionality 251 */ 252 253DEFINE_MUTEX(ide_setting_mtx); 254 255EXPORT_SYMBOL_GPL(ide_setting_mtx); 256 257/** 258 * ide_spin_wait_hwgroup - wait for group 259 * @drive: drive in the group 260 * 261 * Wait for an IDE device group to go non busy and then return 262 * holding the ide_lock which guards the hwgroup->busy status 263 * and right to use it. 264 */ 265 266int ide_spin_wait_hwgroup (ide_drive_t *drive) 267{ 268 ide_hwgroup_t *hwgroup = HWGROUP(drive); 269 unsigned long timeout = jiffies + (3 * HZ); 270 271 spin_lock_irq(&ide_lock); 272 273 while (hwgroup->busy) { 274 unsigned long lflags; 275 spin_unlock_irq(&ide_lock); 276 local_irq_set(lflags); 277 if (time_after(jiffies, timeout)) { 278 local_irq_restore(lflags); 279 printk(KERN_ERR "%s: channel busy\n", drive->name); 280 return -EBUSY; 281 } 282 local_irq_restore(lflags); 283 spin_lock_irq(&ide_lock); 284 } 285 return 0; 286} 287 288EXPORT_SYMBOL(ide_spin_wait_hwgroup); 289 290ide_devset_get(io_32bit, io_32bit); 291 292int set_io_32bit(ide_drive_t *drive, int arg) 293{ 294 if (drive->no_io_32bit) 295 return -EPERM; 296 297 if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1)) 298 return -EINVAL; 299 300 if (ide_spin_wait_hwgroup(drive)) 301 return -EBUSY; 302 303 drive->io_32bit = arg; 304 305 spin_unlock_irq(&ide_lock); 306 307 return 0; 308} 309 310ide_devset_get(ksettings, keep_settings); 311 312int set_ksettings(ide_drive_t *drive, int arg) 313{ 314 if (arg < 0 || arg > 1) 315 return -EINVAL; 316 317 if (ide_spin_wait_hwgroup(drive)) 318 return -EBUSY; 319 drive->keep_settings = arg; 320 spin_unlock_irq(&ide_lock); 321 322 return 0; 323} 324 325ide_devset_get(using_dma, using_dma); 326 327int set_using_dma(ide_drive_t *drive, int arg) 328{ 329#ifdef CONFIG_BLK_DEV_IDEDMA 330 ide_hwif_t *hwif = drive->hwif; 331 int err = -EPERM; 332 333 if (arg < 0 || arg > 1) 334 return -EINVAL; 335 336 if (ata_id_has_dma(drive->id) == 0) 337 goto out; 338 339 if (hwif->dma_ops == NULL) 340 goto out; 341 342 err = -EBUSY; 343 if (ide_spin_wait_hwgroup(drive)) 344 goto out; 345 /* 346 * set ->busy flag, unlock and let it ride 347 */ 348 hwif->hwgroup->busy = 1; 349 spin_unlock_irq(&ide_lock); 350 351 err = 0; 352 353 if (arg) { 354 if (ide_set_dma(drive)) 355 err = -EIO; 356 } else 357 ide_dma_off(drive); 358 359 /* 360 * lock, clear ->busy flag and unlock before leaving 361 */ 362 spin_lock_irq(&ide_lock); 363 hwif->hwgroup->busy = 0; 364 spin_unlock_irq(&ide_lock); 365out: 366 return err; 367#else 368 if (arg < 0 || arg > 1) 369 return -EINVAL; 370 371 return -EPERM; 372#endif 373} 374 375int set_pio_mode(ide_drive_t *drive, int arg) 376{ 377 struct request *rq; 378 ide_hwif_t *hwif = drive->hwif; 379 const struct ide_port_ops *port_ops = hwif->port_ops; 380 381 if (arg < 0 || arg > 255) 382 return -EINVAL; 383 384 if (port_ops == NULL || port_ops->set_pio_mode == NULL || 385 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) 386 return -ENOSYS; 387 388 if (drive->special.b.set_tune) 389 return -EBUSY; 390 391 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 392 rq->cmd_type = REQ_TYPE_ATA_TASKFILE; 393 394 drive->tune_req = (u8) arg; 395 drive->special.b.set_tune = 1; 396 397 blk_execute_rq(drive->queue, NULL, rq, 0); 398 blk_put_request(rq); 399 400 return 0; 401} 402 403ide_devset_get(unmaskirq, unmask); 404 405int set_unmaskirq(ide_drive_t *drive, int arg) 406{ 407 if (drive->no_unmask) 408 return -EPERM; 409 410 if (arg < 0 || arg > 1) 411 return -EINVAL; 412 413 if (ide_spin_wait_hwgroup(drive)) 414 return -EBUSY; 415 drive->unmask = arg; 416 spin_unlock_irq(&ide_lock); 417 418 return 0; 419} 420 421static int generic_ide_suspend(struct device *dev, pm_message_t mesg) 422{ 423 ide_drive_t *drive = dev->driver_data; 424 ide_hwif_t *hwif = HWIF(drive); 425 struct request *rq; 426 struct request_pm_state rqpm; 427 ide_task_t args; 428 int ret; 429 430 /* Call ACPI _GTM only once */ 431 if (!(drive->dn % 2)) 432 ide_acpi_get_timing(hwif); 433 434 memset(&rqpm, 0, sizeof(rqpm)); 435 memset(&args, 0, sizeof(args)); 436 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 437 rq->cmd_type = REQ_TYPE_PM_SUSPEND; 438 rq->special = &args; 439 rq->data = &rqpm; 440 rqpm.pm_step = ide_pm_state_start_suspend; 441 if (mesg.event == PM_EVENT_PRETHAW) 442 mesg.event = PM_EVENT_FREEZE; 443 rqpm.pm_state = mesg.event; 444 445 ret = blk_execute_rq(drive->queue, NULL, rq, 0); 446 blk_put_request(rq); 447 /* only call ACPI _PS3 after both drivers are suspended */ 448 if (!ret && (((drive->dn % 2) && hwif->drives[0].present 449 && hwif->drives[1].present) 450 || !hwif->drives[0].present 451 || !hwif->drives[1].present)) 452 ide_acpi_set_state(hwif, 0); 453 return ret; 454} 455 456static int generic_ide_resume(struct device *dev) 457{ 458 ide_drive_t *drive = dev->driver_data; 459 ide_hwif_t *hwif = HWIF(drive); 460 struct request *rq; 461 struct request_pm_state rqpm; 462 ide_task_t args; 463 int err; 464 465 /* Call ACPI _STM only once */ 466 if (!(drive->dn % 2)) { 467 ide_acpi_set_state(hwif, 1); 468 ide_acpi_push_timing(hwif); 469 } 470 471 ide_acpi_exec_tfs(drive); 472 473 memset(&rqpm, 0, sizeof(rqpm)); 474 memset(&args, 0, sizeof(args)); 475 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 476 rq->cmd_type = REQ_TYPE_PM_RESUME; 477 rq->cmd_flags |= REQ_PREEMPT; 478 rq->special = &args; 479 rq->data = &rqpm; 480 rqpm.pm_step = ide_pm_state_start_resume; 481 rqpm.pm_state = PM_EVENT_ON; 482 483 err = blk_execute_rq(drive->queue, NULL, rq, 1); 484 blk_put_request(rq); 485 486 if (err == 0 && dev->driver) { 487 ide_driver_t *drv = to_ide_driver(dev->driver); 488 489 if (drv->resume) 490 drv->resume(drive); 491 } 492 493 return err; 494} 495 496static int generic_drive_reset(ide_drive_t *drive) 497{ 498 struct request *rq; 499 int ret = 0; 500 501 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 502 rq->cmd_type = REQ_TYPE_SPECIAL; 503 rq->cmd_len = 1; 504 rq->cmd[0] = REQ_DRIVE_RESET; 505 rq->cmd_flags |= REQ_SOFTBARRIER; 506 if (blk_execute_rq(drive->queue, NULL, rq, 1)) 507 ret = rq->errors; 508 blk_put_request(rq); 509 return ret; 510} 511 512static inline void ide_id_to_hd_driveid(u16 *id) 513{ 514#ifdef __BIG_ENDIAN 515 /* accessed in struct hd_driveid as 8-bit values */ 516 id[ATA_ID_MAX_MULTSECT] = __cpu_to_le16(id[ATA_ID_MAX_MULTSECT]); 517 id[ATA_ID_CAPABILITY] = __cpu_to_le16(id[ATA_ID_CAPABILITY]); 518 id[ATA_ID_OLD_PIO_MODES] = __cpu_to_le16(id[ATA_ID_OLD_PIO_MODES]); 519 id[ATA_ID_OLD_DMA_MODES] = __cpu_to_le16(id[ATA_ID_OLD_DMA_MODES]); 520 id[ATA_ID_MULTSECT] = __cpu_to_le16(id[ATA_ID_MULTSECT]); 521 522 /* as 32-bit values */ 523 *(u32 *)&id[ATA_ID_LBA_CAPACITY] = ata_id_u32(id, ATA_ID_LBA_CAPACITY); 524 *(u32 *)&id[ATA_ID_SPG] = ata_id_u32(id, ATA_ID_SPG); 525 526 /* as 64-bit value */ 527 *(u64 *)&id[ATA_ID_LBA_CAPACITY_2] = 528 ata_id_u64(id, ATA_ID_LBA_CAPACITY_2); 529#endif 530} 531 532static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd, 533 unsigned long arg) 534{ 535 u16 *id = NULL; 536 int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142; 537 int rc = 0; 538 539 if (drive->id_read == 0) { 540 rc = -ENOMSG; 541 goto out; 542 } 543 544 id = kmalloc(size, GFP_KERNEL); 545 if (id == NULL) { 546 rc = -ENOMEM; 547 goto out; 548 } 549 550 memcpy(id, drive->id, size); 551 ide_id_to_hd_driveid(id); 552 553 if (copy_to_user((void __user *)arg, id, size)) 554 rc = -EFAULT; 555 556 kfree(id); 557out: 558 return rc; 559} 560 561static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg) 562{ 563 return put_user((drive->dsc_overlap << IDE_NICE_DSC_OVERLAP) | 564 (drive->nice1 << IDE_NICE_1), (long __user *)arg); 565} 566 567static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg) 568{ 569 if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1)))) 570 return -EPERM; 571 572 if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) && 573 (drive->media == ide_disk || drive->media == ide_floppy || 574 drive->scsi)) 575 return -EPERM; 576 577 drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1; 578 drive->nice1 = (arg >> IDE_NICE_1) & 1; 579 580 return 0; 581} 582 583int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev, 584 unsigned int cmd, unsigned long arg) 585{ 586 unsigned long flags; 587 int err = 0, (*getfunc)(ide_drive_t *), (*setfunc)(ide_drive_t *, int); 588 589 switch (cmd) { 590 case HDIO_GET_32BIT: getfunc = get_io_32bit; goto read_val; 591 case HDIO_GET_KEEPSETTINGS: getfunc = get_ksettings; goto read_val; 592 case HDIO_GET_UNMASKINTR: getfunc = get_unmaskirq; goto read_val; 593 case HDIO_GET_DMA: getfunc = get_using_dma; goto read_val; 594 case HDIO_SET_32BIT: setfunc = set_io_32bit; goto set_val; 595 case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings; goto set_val; 596 case HDIO_SET_PIO_MODE: setfunc = set_pio_mode; goto set_val; 597 case HDIO_SET_UNMASKINTR: setfunc = set_unmaskirq; goto set_val; 598 case HDIO_SET_DMA: setfunc = set_using_dma; goto set_val; 599 } 600 601 switch (cmd) { 602 case HDIO_OBSOLETE_IDENTITY: 603 case HDIO_GET_IDENTITY: 604 if (bdev != bdev->bd_contains) 605 return -EINVAL; 606 return ide_get_identity_ioctl(drive, cmd, arg); 607 case HDIO_GET_NICE: 608 return ide_get_nice_ioctl(drive, arg); 609#ifdef CONFIG_IDE_TASK_IOCTL 610 case HDIO_DRIVE_TASKFILE: 611 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 612 return -EACCES; 613 switch(drive->media) { 614 case ide_disk: 615 return ide_taskfile_ioctl(drive, cmd, arg); 616 default: 617 return -ENOMSG; 618 } 619#endif /* CONFIG_IDE_TASK_IOCTL */ 620 621 case HDIO_DRIVE_CMD: 622 if (!capable(CAP_SYS_RAWIO)) 623 return -EACCES; 624 return ide_cmd_ioctl(drive, cmd, arg); 625 626 case HDIO_DRIVE_TASK: 627 if (!capable(CAP_SYS_RAWIO)) 628 return -EACCES; 629 return ide_task_ioctl(drive, cmd, arg); 630 case HDIO_SET_NICE: 631 if (!capable(CAP_SYS_ADMIN)) 632 return -EACCES; 633 return ide_set_nice_ioctl(drive, arg); 634 case HDIO_DRIVE_RESET: 635 if (!capable(CAP_SYS_ADMIN)) 636 return -EACCES; 637 638 return generic_drive_reset(drive); 639 640 case HDIO_GET_BUSSTATE: 641 if (!capable(CAP_SYS_ADMIN)) 642 return -EACCES; 643 if (put_user(HWIF(drive)->bus_state, (long __user *)arg)) 644 return -EFAULT; 645 return 0; 646 647 case HDIO_SET_BUSSTATE: 648 if (!capable(CAP_SYS_ADMIN)) 649 return -EACCES; 650 return -EOPNOTSUPP; 651 default: 652 return -EINVAL; 653 } 654 655read_val: 656 mutex_lock(&ide_setting_mtx); 657 spin_lock_irqsave(&ide_lock, flags); 658 err = getfunc(drive); 659 spin_unlock_irqrestore(&ide_lock, flags); 660 mutex_unlock(&ide_setting_mtx); 661 return err >= 0 ? put_user(err, (long __user *)arg) : err; 662 663set_val: 664 if (bdev != bdev->bd_contains) 665 err = -EINVAL; 666 else { 667 if (!capable(CAP_SYS_ADMIN)) 668 err = -EACCES; 669 else { 670 mutex_lock(&ide_setting_mtx); 671 err = setfunc(drive, arg); 672 mutex_unlock(&ide_setting_mtx); 673 } 674 } 675 return err; 676} 677 678EXPORT_SYMBOL(generic_ide_ioctl); 679 680/** 681 * ide_device_get - get an additional reference to a ide_drive_t 682 * @drive: device to get a reference to 683 * 684 * Gets a reference to the ide_drive_t and increments the use count of the 685 * underlying LLDD module. 686 */ 687int ide_device_get(ide_drive_t *drive) 688{ 689 struct device *host_dev; 690 struct module *module; 691 692 if (!get_device(&drive->gendev)) 693 return -ENXIO; 694 695 host_dev = drive->hwif->host->dev[0]; 696 module = host_dev ? host_dev->driver->owner : NULL; 697 698 if (module && !try_module_get(module)) { 699 put_device(&drive->gendev); 700 return -ENXIO; 701 } 702 703 return 0; 704} 705EXPORT_SYMBOL_GPL(ide_device_get); 706 707/** 708 * ide_device_put - release a reference to a ide_drive_t 709 * @drive: device to release a reference on 710 * 711 * Release a reference to the ide_drive_t and decrements the use count of 712 * the underlying LLDD module. 713 */ 714void ide_device_put(ide_drive_t *drive) 715{ 716#ifdef CONFIG_MODULE_UNLOAD 717 struct device *host_dev = drive->hwif->host->dev[0]; 718 struct module *module = host_dev ? host_dev->driver->owner : NULL; 719 720 if (module) 721 module_put(module); 722#endif 723 put_device(&drive->gendev); 724} 725EXPORT_SYMBOL_GPL(ide_device_put); 726 727static int ide_bus_match(struct device *dev, struct device_driver *drv) 728{ 729 return 1; 730} 731 732static char *media_string(ide_drive_t *drive) 733{ 734 switch (drive->media) { 735 case ide_disk: 736 return "disk"; 737 case ide_cdrom: 738 return "cdrom"; 739 case ide_tape: 740 return "tape"; 741 case ide_floppy: 742 return "floppy"; 743 case ide_optical: 744 return "optical"; 745 default: 746 return "UNKNOWN"; 747 } 748} 749 750static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf) 751{ 752 ide_drive_t *drive = to_ide_device(dev); 753 return sprintf(buf, "%s\n", media_string(drive)); 754} 755 756static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf) 757{ 758 ide_drive_t *drive = to_ide_device(dev); 759 return sprintf(buf, "%s\n", drive->name); 760} 761 762static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) 763{ 764 ide_drive_t *drive = to_ide_device(dev); 765 return sprintf(buf, "ide:m-%s\n", media_string(drive)); 766} 767 768static ssize_t model_show(struct device *dev, struct device_attribute *attr, 769 char *buf) 770{ 771 ide_drive_t *drive = to_ide_device(dev); 772 return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_PROD]); 773} 774 775static ssize_t firmware_show(struct device *dev, struct device_attribute *attr, 776 char *buf) 777{ 778 ide_drive_t *drive = to_ide_device(dev); 779 return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_FW_REV]); 780} 781 782static ssize_t serial_show(struct device *dev, struct device_attribute *attr, 783 char *buf) 784{ 785 ide_drive_t *drive = to_ide_device(dev); 786 return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_SERNO]); 787} 788 789static struct device_attribute ide_dev_attrs[] = { 790 __ATTR_RO(media), 791 __ATTR_RO(drivename), 792 __ATTR_RO(modalias), 793 __ATTR_RO(model), 794 __ATTR_RO(firmware), 795 __ATTR(serial, 0400, serial_show, NULL), 796 __ATTR_NULL 797}; 798 799static int ide_uevent(struct device *dev, struct kobj_uevent_env *env) 800{ 801 ide_drive_t *drive = to_ide_device(dev); 802 803 add_uevent_var(env, "MEDIA=%s", media_string(drive)); 804 add_uevent_var(env, "DRIVENAME=%s", drive->name); 805 add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive)); 806 return 0; 807} 808 809static int generic_ide_probe(struct device *dev) 810{ 811 ide_drive_t *drive = to_ide_device(dev); 812 ide_driver_t *drv = to_ide_driver(dev->driver); 813 814 return drv->probe ? drv->probe(drive) : -ENODEV; 815} 816 817static int generic_ide_remove(struct device *dev) 818{ 819 ide_drive_t *drive = to_ide_device(dev); 820 ide_driver_t *drv = to_ide_driver(dev->driver); 821 822 if (drv->remove) 823 drv->remove(drive); 824 825 return 0; 826} 827 828static void generic_ide_shutdown(struct device *dev) 829{ 830 ide_drive_t *drive = to_ide_device(dev); 831 ide_driver_t *drv = to_ide_driver(dev->driver); 832 833 if (dev->driver && drv->shutdown) 834 drv->shutdown(drive); 835} 836 837struct bus_type ide_bus_type = { 838 .name = "ide", 839 .match = ide_bus_match, 840 .uevent = ide_uevent, 841 .probe = generic_ide_probe, 842 .remove = generic_ide_remove, 843 .shutdown = generic_ide_shutdown, 844 .dev_attrs = ide_dev_attrs, 845 .suspend = generic_ide_suspend, 846 .resume = generic_ide_resume, 847}; 848 849EXPORT_SYMBOL_GPL(ide_bus_type); 850 851int ide_vlb_clk; 852EXPORT_SYMBOL_GPL(ide_vlb_clk); 853 854module_param_named(vlb_clock, ide_vlb_clk, int, 0); 855MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)"); 856 857int ide_pci_clk; 858EXPORT_SYMBOL_GPL(ide_pci_clk); 859 860module_param_named(pci_clock, ide_pci_clk, int, 0); 861MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)"); 862 863static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp) 864{ 865 int a, b, i, j = 1; 866 unsigned int *dev_param_mask = (unsigned int *)kp->arg; 867 868 if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 && 869 sscanf(s, "%d.%d", &a, &b) != 2) 870 return -EINVAL; 871 872 i = a * MAX_DRIVES + b; 873 874 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 875 return -EINVAL; 876 877 if (j) 878 *dev_param_mask |= (1 << i); 879 else 880 *dev_param_mask &= (1 << i); 881 882 return 0; 883} 884 885static unsigned int ide_nodma; 886 887module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0); 888MODULE_PARM_DESC(nodma, "disallow DMA for a device"); 889 890static unsigned int ide_noflush; 891 892module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0); 893MODULE_PARM_DESC(noflush, "disable flush requests for a device"); 894 895static unsigned int ide_noprobe; 896 897module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0); 898MODULE_PARM_DESC(noprobe, "skip probing for a device"); 899 900static unsigned int ide_nowerr; 901 902module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0); 903MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device"); 904 905static unsigned int ide_cdroms; 906 907module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0); 908MODULE_PARM_DESC(cdrom, "force device as a CD-ROM"); 909 910struct chs_geom { 911 unsigned int cyl; 912 u8 head; 913 u8 sect; 914}; 915 916static unsigned int ide_disks; 917static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES]; 918 919static int ide_set_disk_chs(const char *str, struct kernel_param *kp) 920{ 921 int a, b, c = 0, h = 0, s = 0, i, j = 1; 922 923 if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 && 924 sscanf(str, "%d.%d:%d", &a, &b, &j) != 3) 925 return -EINVAL; 926 927 i = a * MAX_DRIVES + b; 928 929 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 930 return -EINVAL; 931 932 if (c > INT_MAX || h > 255 || s > 255) 933 return -EINVAL; 934 935 if (j) 936 ide_disks |= (1 << i); 937 else 938 ide_disks &= (1 << i); 939 940 ide_disks_chs[i].cyl = c; 941 ide_disks_chs[i].head = h; 942 ide_disks_chs[i].sect = s; 943 944 return 0; 945} 946 947module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0); 948MODULE_PARM_DESC(chs, "force device as a disk (using CHS)"); 949 950static void ide_dev_apply_params(ide_drive_t *drive) 951{ 952 int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit; 953 954 if (ide_nodma & (1 << i)) { 955 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name); 956 drive->nodma = 1; 957 } 958 if (ide_noflush & (1 << i)) { 959 printk(KERN_INFO "ide: disabling flush requests for %s\n", 960 drive->name); 961 drive->noflush = 1; 962 } 963 if (ide_noprobe & (1 << i)) { 964 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name); 965 drive->noprobe = 1; 966 } 967 if (ide_nowerr & (1 << i)) { 968 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n", 969 drive->name); 970 drive->bad_wstat = BAD_R_STAT; 971 } 972 if (ide_cdroms & (1 << i)) { 973 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name); 974 drive->present = 1; 975 drive->media = ide_cdrom; 976 /* an ATAPI device ignores DRDY */ 977 drive->ready_stat = 0; 978 } 979 if (ide_disks & (1 << i)) { 980 drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl; 981 drive->head = drive->bios_head = ide_disks_chs[i].head; 982 drive->sect = drive->bios_sect = ide_disks_chs[i].sect; 983 drive->forced_geom = 1; 984 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n", 985 drive->name, 986 drive->cyl, drive->head, drive->sect); 987 drive->present = 1; 988 drive->media = ide_disk; 989 drive->ready_stat = ATA_DRDY; 990 } 991} 992 993static unsigned int ide_ignore_cable; 994 995static int ide_set_ignore_cable(const char *s, struct kernel_param *kp) 996{ 997 int i, j = 1; 998 999 if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1) 1000 return -EINVAL; 1001 1002 if (i >= MAX_HWIFS || j < 0 || j > 1) 1003 return -EINVAL; 1004 1005 if (j) 1006 ide_ignore_cable |= (1 << i); 1007 else 1008 ide_ignore_cable &= (1 << i); 1009 1010 return 0; 1011} 1012 1013module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0); 1014MODULE_PARM_DESC(ignore_cable, "ignore cable detection"); 1015 1016void ide_port_apply_params(ide_hwif_t *hwif) 1017{ 1018 int i; 1019 1020 if (ide_ignore_cable & (1 << hwif->index)) { 1021 printk(KERN_INFO "ide: ignoring cable detection for %s\n", 1022 hwif->name); 1023 hwif->cbl = ATA_CBL_PATA40_SHORT; 1024 } 1025 1026 for (i = 0; i < MAX_DRIVES; i++) 1027 ide_dev_apply_params(&hwif->drives[i]); 1028} 1029 1030/* 1031 * This is gets invoked once during initialization, to set *everything* up 1032 */ 1033static int __init ide_init(void) 1034{ 1035 int ret; 1036 1037 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n"); 1038 1039 ret = bus_register(&ide_bus_type); 1040 if (ret < 0) { 1041 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret); 1042 return ret; 1043 } 1044 1045 ide_port_class = class_create(THIS_MODULE, "ide_port"); 1046 if (IS_ERR(ide_port_class)) { 1047 ret = PTR_ERR(ide_port_class); 1048 goto out_port_class; 1049 } 1050 1051 proc_ide_create(); 1052 1053 return 0; 1054 1055out_port_class: 1056 bus_unregister(&ide_bus_type); 1057 1058 return ret; 1059} 1060 1061static void __exit ide_exit(void) 1062{ 1063 proc_ide_destroy(); 1064 1065 class_destroy(ide_port_class); 1066 1067 bus_unregister(&ide_bus_type); 1068} 1069 1070module_init(ide_init); 1071module_exit(ide_exit); 1072 1073MODULE_LICENSE("GPL"); 1074