ide.c revision 48fb2688aa67baba373531cc4ed2d9e695983c3f
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#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/interrupt.h> 54#include <linux/major.h> 55#include <linux/errno.h> 56#include <linux/genhd.h> 57#include <linux/slab.h> 58#include <linux/init.h> 59#include <linux/pci.h> 60#include <linux/ide.h> 61#include <linux/completion.h> 62#include <linux/device.h> 63 64 65/* default maximum number of failures */ 66#define IDE_DEFAULT_MAX_FAILURES 1 67 68struct class *ide_port_class; 69 70static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR, 71 IDE2_MAJOR, IDE3_MAJOR, 72 IDE4_MAJOR, IDE5_MAJOR, 73 IDE6_MAJOR, IDE7_MAJOR, 74 IDE8_MAJOR, IDE9_MAJOR }; 75 76DEFINE_MUTEX(ide_cfg_mtx); 77 78__cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock); 79EXPORT_SYMBOL(ide_lock); 80 81static void ide_port_init_devices_data(ide_hwif_t *); 82 83/* 84 * Do not even *think* about calling this! 85 */ 86void ide_init_port_data(ide_hwif_t *hwif, unsigned int index) 87{ 88 /* bulk initialize hwif & drive info with zeros */ 89 memset(hwif, 0, sizeof(ide_hwif_t)); 90 91 /* fill in any non-zero initial values */ 92 hwif->index = index; 93 hwif->major = ide_hwif_to_major[index]; 94 95 hwif->name[0] = 'i'; 96 hwif->name[1] = 'd'; 97 hwif->name[2] = 'e'; 98 hwif->name[3] = '0' + index; 99 100 hwif->bus_state = BUSSTATE_ON; 101 102 init_completion(&hwif->gendev_rel_comp); 103 104 hwif->tp_ops = &default_tp_ops; 105 106 ide_port_init_devices_data(hwif); 107} 108 109static void ide_port_init_devices_data(ide_hwif_t *hwif) 110{ 111 int unit; 112 113 for (unit = 0; unit < MAX_DRIVES; ++unit) { 114 ide_drive_t *drive = &hwif->drives[unit]; 115 u8 j = (hwif->index * MAX_DRIVES) + unit; 116 117 memset(drive, 0, sizeof(*drive)); 118 119 drive->media = ide_disk; 120 drive->select.all = (unit<<4)|0xa0; 121 drive->hwif = hwif; 122 drive->ready_stat = READY_STAT; 123 drive->bad_wstat = BAD_W_STAT; 124 drive->special.b.recalibrate = 1; 125 drive->special.b.set_geometry = 1; 126 drive->name[0] = 'h'; 127 drive->name[1] = 'd'; 128 drive->name[2] = 'a' + j; 129 drive->max_failures = IDE_DEFAULT_MAX_FAILURES; 130 131 INIT_LIST_HEAD(&drive->list); 132 init_completion(&drive->gendev_rel_comp); 133 } 134} 135 136/* Called with ide_lock held. */ 137static void __ide_port_unregister_devices(ide_hwif_t *hwif) 138{ 139 int i; 140 141 for (i = 0; i < MAX_DRIVES; i++) { 142 ide_drive_t *drive = &hwif->drives[i]; 143 144 if (drive->present) { 145 spin_unlock_irq(&ide_lock); 146 device_unregister(&drive->gendev); 147 wait_for_completion(&drive->gendev_rel_comp); 148 spin_lock_irq(&ide_lock); 149 } 150 } 151} 152 153void ide_port_unregister_devices(ide_hwif_t *hwif) 154{ 155 mutex_lock(&ide_cfg_mtx); 156 spin_lock_irq(&ide_lock); 157 __ide_port_unregister_devices(hwif); 158 hwif->present = 0; 159 ide_port_init_devices_data(hwif); 160 spin_unlock_irq(&ide_lock); 161 mutex_unlock(&ide_cfg_mtx); 162} 163EXPORT_SYMBOL_GPL(ide_port_unregister_devices); 164 165/** 166 * ide_unregister - free an IDE interface 167 * @hwif: IDE interface 168 * 169 * Perform the final unregister of an IDE interface. At the moment 170 * we don't refcount interfaces so this will also get split up. 171 * 172 * Locking: 173 * The caller must not hold the IDE locks 174 * The drive present/vanishing is not yet properly locked 175 * Take care with the callbacks. These have been split to avoid 176 * deadlocking the IDE layer. The shutdown callback is called 177 * before we take the lock and free resources. It is up to the 178 * caller to be sure there is no pending I/O here, and that 179 * the interface will not be reopened (present/vanishing locking 180 * isn't yet done BTW). After we commit to the final kill we 181 * call the cleanup callback with the ide locks held. 182 * 183 * Unregister restores the hwif structures to the default state. 184 * This is raving bonkers. 185 */ 186 187void ide_unregister(ide_hwif_t *hwif) 188{ 189 ide_hwif_t *g; 190 ide_hwgroup_t *hwgroup; 191 int irq_count = 0; 192 193 BUG_ON(in_interrupt()); 194 BUG_ON(irqs_disabled()); 195 196 mutex_lock(&ide_cfg_mtx); 197 198 spin_lock_irq(&ide_lock); 199 if (hwif->present) { 200 __ide_port_unregister_devices(hwif); 201 hwif->present = 0; 202 } 203 spin_unlock_irq(&ide_lock); 204 205 ide_proc_unregister_port(hwif); 206 207 hwgroup = hwif->hwgroup; 208 /* 209 * free the irq if we were the only hwif using it 210 */ 211 g = hwgroup->hwif; 212 do { 213 if (g->irq == hwif->irq) 214 ++irq_count; 215 g = g->next; 216 } while (g != hwgroup->hwif); 217 if (irq_count == 1) 218 free_irq(hwif->irq, hwgroup); 219 220 ide_remove_port_from_hwgroup(hwif); 221 222 device_unregister(hwif->portdev); 223 device_unregister(&hwif->gendev); 224 wait_for_completion(&hwif->gendev_rel_comp); 225 226 /* 227 * Remove us from the kernel's knowledge 228 */ 229 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS); 230 kfree(hwif->sg_table); 231 unregister_blkdev(hwif->major, hwif->name); 232 233 if (hwif->dma_base) 234 ide_release_dma_engine(hwif); 235 236 mutex_unlock(&ide_cfg_mtx); 237} 238 239void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw) 240{ 241 memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports)); 242 hwif->irq = hw->irq; 243 hwif->chipset = hw->chipset; 244 hwif->dev = hw->dev; 245 hwif->gendev.parent = hw->parent ? hw->parent : hw->dev; 246 hwif->ack_intr = hw->ack_intr; 247 hwif->config_data = hw->config; 248} 249 250/* 251 * Locks for IDE setting functionality 252 */ 253 254DEFINE_MUTEX(ide_setting_mtx); 255 256EXPORT_SYMBOL_GPL(ide_setting_mtx); 257 258/** 259 * ide_spin_wait_hwgroup - wait for group 260 * @drive: drive in the group 261 * 262 * Wait for an IDE device group to go non busy and then return 263 * holding the ide_lock which guards the hwgroup->busy status 264 * and right to use it. 265 */ 266 267int ide_spin_wait_hwgroup (ide_drive_t *drive) 268{ 269 ide_hwgroup_t *hwgroup = HWGROUP(drive); 270 unsigned long timeout = jiffies + (3 * HZ); 271 272 spin_lock_irq(&ide_lock); 273 274 while (hwgroup->busy) { 275 unsigned long lflags; 276 spin_unlock_irq(&ide_lock); 277 local_irq_set(lflags); 278 if (time_after(jiffies, timeout)) { 279 local_irq_restore(lflags); 280 printk(KERN_ERR "%s: channel busy\n", drive->name); 281 return -EBUSY; 282 } 283 local_irq_restore(lflags); 284 spin_lock_irq(&ide_lock); 285 } 286 return 0; 287} 288 289EXPORT_SYMBOL(ide_spin_wait_hwgroup); 290 291int set_io_32bit(ide_drive_t *drive, int arg) 292{ 293 if (drive->no_io_32bit) 294 return -EPERM; 295 296 if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1)) 297 return -EINVAL; 298 299 if (ide_spin_wait_hwgroup(drive)) 300 return -EBUSY; 301 302 drive->io_32bit = arg; 303 304 spin_unlock_irq(&ide_lock); 305 306 return 0; 307} 308 309static int set_ksettings(ide_drive_t *drive, int arg) 310{ 311 if (arg < 0 || arg > 1) 312 return -EINVAL; 313 314 if (ide_spin_wait_hwgroup(drive)) 315 return -EBUSY; 316 drive->keep_settings = arg; 317 spin_unlock_irq(&ide_lock); 318 319 return 0; 320} 321 322int set_using_dma(ide_drive_t *drive, int arg) 323{ 324#ifdef CONFIG_BLK_DEV_IDEDMA 325 ide_hwif_t *hwif = drive->hwif; 326 int err = -EPERM; 327 328 if (arg < 0 || arg > 1) 329 return -EINVAL; 330 331 if (ata_id_has_dma(drive->id) == 0) 332 goto out; 333 334 if (hwif->dma_ops == NULL) 335 goto out; 336 337 err = -EBUSY; 338 if (ide_spin_wait_hwgroup(drive)) 339 goto out; 340 /* 341 * set ->busy flag, unlock and let it ride 342 */ 343 hwif->hwgroup->busy = 1; 344 spin_unlock_irq(&ide_lock); 345 346 err = 0; 347 348 if (arg) { 349 if (ide_set_dma(drive)) 350 err = -EIO; 351 } else 352 ide_dma_off(drive); 353 354 /* 355 * lock, clear ->busy flag and unlock before leaving 356 */ 357 spin_lock_irq(&ide_lock); 358 hwif->hwgroup->busy = 0; 359 spin_unlock_irq(&ide_lock); 360out: 361 return err; 362#else 363 if (arg < 0 || arg > 1) 364 return -EINVAL; 365 366 return -EPERM; 367#endif 368} 369 370int set_pio_mode(ide_drive_t *drive, int arg) 371{ 372 struct request *rq; 373 ide_hwif_t *hwif = drive->hwif; 374 const struct ide_port_ops *port_ops = hwif->port_ops; 375 376 if (arg < 0 || arg > 255) 377 return -EINVAL; 378 379 if (port_ops == NULL || port_ops->set_pio_mode == NULL || 380 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) 381 return -ENOSYS; 382 383 if (drive->special.b.set_tune) 384 return -EBUSY; 385 386 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 387 rq->cmd_type = REQ_TYPE_ATA_TASKFILE; 388 389 drive->tune_req = (u8) arg; 390 drive->special.b.set_tune = 1; 391 392 blk_execute_rq(drive->queue, NULL, rq, 0); 393 blk_put_request(rq); 394 395 return 0; 396} 397 398static int set_unmaskirq(ide_drive_t *drive, int arg) 399{ 400 if (drive->no_unmask) 401 return -EPERM; 402 403 if (arg < 0 || arg > 1) 404 return -EINVAL; 405 406 if (ide_spin_wait_hwgroup(drive)) 407 return -EBUSY; 408 drive->unmask = arg; 409 spin_unlock_irq(&ide_lock); 410 411 return 0; 412} 413 414static int generic_ide_suspend(struct device *dev, pm_message_t mesg) 415{ 416 ide_drive_t *drive = dev->driver_data; 417 ide_hwif_t *hwif = HWIF(drive); 418 struct request *rq; 419 struct request_pm_state rqpm; 420 ide_task_t args; 421 int ret; 422 423 /* Call ACPI _GTM only once */ 424 if (!(drive->dn % 2)) 425 ide_acpi_get_timing(hwif); 426 427 memset(&rqpm, 0, sizeof(rqpm)); 428 memset(&args, 0, sizeof(args)); 429 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 430 rq->cmd_type = REQ_TYPE_PM_SUSPEND; 431 rq->special = &args; 432 rq->data = &rqpm; 433 rqpm.pm_step = ide_pm_state_start_suspend; 434 if (mesg.event == PM_EVENT_PRETHAW) 435 mesg.event = PM_EVENT_FREEZE; 436 rqpm.pm_state = mesg.event; 437 438 ret = blk_execute_rq(drive->queue, NULL, rq, 0); 439 blk_put_request(rq); 440 /* only call ACPI _PS3 after both drivers are suspended */ 441 if (!ret && (((drive->dn % 2) && hwif->drives[0].present 442 && hwif->drives[1].present) 443 || !hwif->drives[0].present 444 || !hwif->drives[1].present)) 445 ide_acpi_set_state(hwif, 0); 446 return ret; 447} 448 449static int generic_ide_resume(struct device *dev) 450{ 451 ide_drive_t *drive = dev->driver_data; 452 ide_hwif_t *hwif = HWIF(drive); 453 struct request *rq; 454 struct request_pm_state rqpm; 455 ide_task_t args; 456 int err; 457 458 /* Call ACPI _STM only once */ 459 if (!(drive->dn % 2)) { 460 ide_acpi_set_state(hwif, 1); 461 ide_acpi_push_timing(hwif); 462 } 463 464 ide_acpi_exec_tfs(drive); 465 466 memset(&rqpm, 0, sizeof(rqpm)); 467 memset(&args, 0, sizeof(args)); 468 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 469 rq->cmd_type = REQ_TYPE_PM_RESUME; 470 rq->cmd_flags |= REQ_PREEMPT; 471 rq->special = &args; 472 rq->data = &rqpm; 473 rqpm.pm_step = ide_pm_state_start_resume; 474 rqpm.pm_state = PM_EVENT_ON; 475 476 err = blk_execute_rq(drive->queue, NULL, rq, 1); 477 blk_put_request(rq); 478 479 if (err == 0 && dev->driver) { 480 ide_driver_t *drv = to_ide_driver(dev->driver); 481 482 if (drv->resume) 483 drv->resume(drive); 484 } 485 486 return err; 487} 488 489static int generic_drive_reset(ide_drive_t *drive) 490{ 491 struct request *rq; 492 int ret = 0; 493 494 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 495 rq->cmd_type = REQ_TYPE_SPECIAL; 496 rq->cmd_len = 1; 497 rq->cmd[0] = REQ_DRIVE_RESET; 498 rq->cmd_flags |= REQ_SOFTBARRIER; 499 if (blk_execute_rq(drive->queue, NULL, rq, 1)) 500 ret = rq->errors; 501 blk_put_request(rq); 502 return ret; 503} 504 505static inline void ide_id_to_hd_driveid(u16 *id) 506{ 507#ifdef __BIG_ENDIAN 508 /* accessed in struct hd_driveid as 8-bit values */ 509 id[ATA_ID_MAX_MULTSECT] = __cpu_to_le16(id[ATA_ID_MAX_MULTSECT]); 510 id[ATA_ID_CAPABILITY] = __cpu_to_le16(id[ATA_ID_CAPABILITY]); 511 id[ATA_ID_OLD_PIO_MODES] = __cpu_to_le16(id[ATA_ID_OLD_PIO_MODES]); 512 id[ATA_ID_OLD_DMA_MODES] = __cpu_to_le16(id[ATA_ID_OLD_DMA_MODES]); 513 id[ATA_ID_MULTSECT] = __cpu_to_le16(id[ATA_ID_MULTSECT]); 514 515 /* as 32-bit values */ 516 *(u32 *)&id[ATA_ID_LBA_CAPACITY] = ata_id_u32(id, ATA_ID_LBA_CAPACITY); 517 *(u32 *)&id[ATA_ID_SPG] = ata_id_u32(id, ATA_ID_SPG); 518 519 /* as 64-bit value */ 520 *(u64 *)&id[ATA_ID_LBA_CAPACITY_2] = 521 ata_id_u64(id, ATA_ID_LBA_CAPACITY_2); 522#endif 523} 524 525static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd, 526 unsigned long arg) 527{ 528 u16 *id = NULL; 529 int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142; 530 int rc = 0; 531 532 if (drive->id_read == 0) { 533 rc = -ENOMSG; 534 goto out; 535 } 536 537 id = kmalloc(size, GFP_KERNEL); 538 if (id == NULL) { 539 rc = -ENOMEM; 540 goto out; 541 } 542 543 memcpy(id, drive->id, size); 544 ide_id_to_hd_driveid(id); 545 546 if (copy_to_user((void __user *)arg, id, size)) 547 rc = -EFAULT; 548 549 kfree(id); 550out: 551 return rc; 552} 553 554int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev, 555 unsigned int cmd, unsigned long arg) 556{ 557 unsigned long flags; 558 ide_driver_t *drv; 559 int err = 0, (*setfunc)(ide_drive_t *, int); 560 u8 *val; 561 562 switch (cmd) { 563 case HDIO_GET_32BIT: val = &drive->io_32bit; goto read_val; 564 case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val; 565 case HDIO_GET_UNMASKINTR: val = &drive->unmask; goto read_val; 566 case HDIO_GET_DMA: val = &drive->using_dma; goto read_val; 567 case HDIO_SET_32BIT: setfunc = set_io_32bit; goto set_val; 568 case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings; goto set_val; 569 case HDIO_SET_PIO_MODE: setfunc = set_pio_mode; goto set_val; 570 case HDIO_SET_UNMASKINTR: setfunc = set_unmaskirq; goto set_val; 571 case HDIO_SET_DMA: setfunc = set_using_dma; goto set_val; 572 } 573 574 switch (cmd) { 575 case HDIO_OBSOLETE_IDENTITY: 576 case HDIO_GET_IDENTITY: 577 if (bdev != bdev->bd_contains) 578 return -EINVAL; 579 return ide_get_identity_ioctl(drive, cmd, arg); 580 case HDIO_GET_NICE: 581 return put_user(drive->dsc_overlap << IDE_NICE_DSC_OVERLAP | 582 drive->atapi_overlap << IDE_NICE_ATAPI_OVERLAP | 583 drive->nice1 << IDE_NICE_1, 584 (long __user *) arg); 585#ifdef CONFIG_IDE_TASK_IOCTL 586 case HDIO_DRIVE_TASKFILE: 587 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 588 return -EACCES; 589 switch(drive->media) { 590 case ide_disk: 591 return ide_taskfile_ioctl(drive, cmd, arg); 592 default: 593 return -ENOMSG; 594 } 595#endif /* CONFIG_IDE_TASK_IOCTL */ 596 597 case HDIO_DRIVE_CMD: 598 if (!capable(CAP_SYS_RAWIO)) 599 return -EACCES; 600 return ide_cmd_ioctl(drive, cmd, arg); 601 602 case HDIO_DRIVE_TASK: 603 if (!capable(CAP_SYS_RAWIO)) 604 return -EACCES; 605 return ide_task_ioctl(drive, cmd, arg); 606 case HDIO_SET_NICE: 607 if (!capable(CAP_SYS_ADMIN)) return -EACCES; 608 if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1)))) 609 return -EPERM; 610 drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1; 611 drv = *(ide_driver_t **)bdev->bd_disk->private_data; 612 if (drive->dsc_overlap && !drv->supports_dsc_overlap) { 613 drive->dsc_overlap = 0; 614 return -EPERM; 615 } 616 drive->nice1 = (arg >> IDE_NICE_1) & 1; 617 return 0; 618 case HDIO_DRIVE_RESET: 619 if (!capable(CAP_SYS_ADMIN)) 620 return -EACCES; 621 622 return generic_drive_reset(drive); 623 624 case HDIO_GET_BUSSTATE: 625 if (!capable(CAP_SYS_ADMIN)) 626 return -EACCES; 627 if (put_user(HWIF(drive)->bus_state, (long __user *)arg)) 628 return -EFAULT; 629 return 0; 630 631 case HDIO_SET_BUSSTATE: 632 if (!capable(CAP_SYS_ADMIN)) 633 return -EACCES; 634 return -EOPNOTSUPP; 635 default: 636 return -EINVAL; 637 } 638 639read_val: 640 mutex_lock(&ide_setting_mtx); 641 spin_lock_irqsave(&ide_lock, flags); 642 err = *val; 643 spin_unlock_irqrestore(&ide_lock, flags); 644 mutex_unlock(&ide_setting_mtx); 645 return err >= 0 ? put_user(err, (long __user *)arg) : err; 646 647set_val: 648 if (bdev != bdev->bd_contains) 649 err = -EINVAL; 650 else { 651 if (!capable(CAP_SYS_ADMIN)) 652 err = -EACCES; 653 else { 654 mutex_lock(&ide_setting_mtx); 655 err = setfunc(drive, arg); 656 mutex_unlock(&ide_setting_mtx); 657 } 658 } 659 return err; 660} 661 662EXPORT_SYMBOL(generic_ide_ioctl); 663 664/** 665 * ide_device_get - get an additional reference to a ide_drive_t 666 * @drive: device to get a reference to 667 * 668 * Gets a reference to the ide_drive_t and increments the use count of the 669 * underlying LLDD module. 670 */ 671int ide_device_get(ide_drive_t *drive) 672{ 673 struct device *host_dev; 674 struct module *module; 675 676 if (!get_device(&drive->gendev)) 677 return -ENXIO; 678 679 host_dev = drive->hwif->host->dev[0]; 680 module = host_dev ? host_dev->driver->owner : NULL; 681 682 if (module && !try_module_get(module)) { 683 put_device(&drive->gendev); 684 return -ENXIO; 685 } 686 687 return 0; 688} 689EXPORT_SYMBOL_GPL(ide_device_get); 690 691/** 692 * ide_device_put - release a reference to a ide_drive_t 693 * @drive: device to release a reference on 694 * 695 * Release a reference to the ide_drive_t and decrements the use count of 696 * the underlying LLDD module. 697 */ 698void ide_device_put(ide_drive_t *drive) 699{ 700#ifdef CONFIG_MODULE_UNLOAD 701 struct device *host_dev = drive->hwif->host->dev[0]; 702 struct module *module = host_dev ? host_dev->driver->owner : NULL; 703 704 if (module) 705 module_put(module); 706#endif 707 put_device(&drive->gendev); 708} 709EXPORT_SYMBOL_GPL(ide_device_put); 710 711static int ide_bus_match(struct device *dev, struct device_driver *drv) 712{ 713 return 1; 714} 715 716static char *media_string(ide_drive_t *drive) 717{ 718 switch (drive->media) { 719 case ide_disk: 720 return "disk"; 721 case ide_cdrom: 722 return "cdrom"; 723 case ide_tape: 724 return "tape"; 725 case ide_floppy: 726 return "floppy"; 727 case ide_optical: 728 return "optical"; 729 default: 730 return "UNKNOWN"; 731 } 732} 733 734static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf) 735{ 736 ide_drive_t *drive = to_ide_device(dev); 737 return sprintf(buf, "%s\n", media_string(drive)); 738} 739 740static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf) 741{ 742 ide_drive_t *drive = to_ide_device(dev); 743 return sprintf(buf, "%s\n", drive->name); 744} 745 746static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) 747{ 748 ide_drive_t *drive = to_ide_device(dev); 749 return sprintf(buf, "ide:m-%s\n", media_string(drive)); 750} 751 752static ssize_t model_show(struct device *dev, struct device_attribute *attr, 753 char *buf) 754{ 755 ide_drive_t *drive = to_ide_device(dev); 756 return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_PROD]); 757} 758 759static ssize_t firmware_show(struct device *dev, struct device_attribute *attr, 760 char *buf) 761{ 762 ide_drive_t *drive = to_ide_device(dev); 763 return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_FW_REV]); 764} 765 766static ssize_t serial_show(struct device *dev, struct device_attribute *attr, 767 char *buf) 768{ 769 ide_drive_t *drive = to_ide_device(dev); 770 return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_SERNO]); 771} 772 773static struct device_attribute ide_dev_attrs[] = { 774 __ATTR_RO(media), 775 __ATTR_RO(drivename), 776 __ATTR_RO(modalias), 777 __ATTR_RO(model), 778 __ATTR_RO(firmware), 779 __ATTR(serial, 0400, serial_show, NULL), 780 __ATTR_NULL 781}; 782 783static int ide_uevent(struct device *dev, struct kobj_uevent_env *env) 784{ 785 ide_drive_t *drive = to_ide_device(dev); 786 787 add_uevent_var(env, "MEDIA=%s", media_string(drive)); 788 add_uevent_var(env, "DRIVENAME=%s", drive->name); 789 add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive)); 790 return 0; 791} 792 793static int generic_ide_probe(struct device *dev) 794{ 795 ide_drive_t *drive = to_ide_device(dev); 796 ide_driver_t *drv = to_ide_driver(dev->driver); 797 798 return drv->probe ? drv->probe(drive) : -ENODEV; 799} 800 801static int generic_ide_remove(struct device *dev) 802{ 803 ide_drive_t *drive = to_ide_device(dev); 804 ide_driver_t *drv = to_ide_driver(dev->driver); 805 806 if (drv->remove) 807 drv->remove(drive); 808 809 return 0; 810} 811 812static void generic_ide_shutdown(struct device *dev) 813{ 814 ide_drive_t *drive = to_ide_device(dev); 815 ide_driver_t *drv = to_ide_driver(dev->driver); 816 817 if (dev->driver && drv->shutdown) 818 drv->shutdown(drive); 819} 820 821struct bus_type ide_bus_type = { 822 .name = "ide", 823 .match = ide_bus_match, 824 .uevent = ide_uevent, 825 .probe = generic_ide_probe, 826 .remove = generic_ide_remove, 827 .shutdown = generic_ide_shutdown, 828 .dev_attrs = ide_dev_attrs, 829 .suspend = generic_ide_suspend, 830 .resume = generic_ide_resume, 831}; 832 833EXPORT_SYMBOL_GPL(ide_bus_type); 834 835int ide_vlb_clk; 836EXPORT_SYMBOL_GPL(ide_vlb_clk); 837 838module_param_named(vlb_clock, ide_vlb_clk, int, 0); 839MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)"); 840 841int ide_pci_clk; 842EXPORT_SYMBOL_GPL(ide_pci_clk); 843 844module_param_named(pci_clock, ide_pci_clk, int, 0); 845MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)"); 846 847static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp) 848{ 849 int a, b, i, j = 1; 850 unsigned int *dev_param_mask = (unsigned int *)kp->arg; 851 852 if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 && 853 sscanf(s, "%d.%d", &a, &b) != 2) 854 return -EINVAL; 855 856 i = a * MAX_DRIVES + b; 857 858 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 859 return -EINVAL; 860 861 if (j) 862 *dev_param_mask |= (1 << i); 863 else 864 *dev_param_mask &= (1 << i); 865 866 return 0; 867} 868 869static unsigned int ide_nodma; 870 871module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0); 872MODULE_PARM_DESC(nodma, "disallow DMA for a device"); 873 874static unsigned int ide_noflush; 875 876module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0); 877MODULE_PARM_DESC(noflush, "disable flush requests for a device"); 878 879static unsigned int ide_noprobe; 880 881module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0); 882MODULE_PARM_DESC(noprobe, "skip probing for a device"); 883 884static unsigned int ide_nowerr; 885 886module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0); 887MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device"); 888 889static unsigned int ide_cdroms; 890 891module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0); 892MODULE_PARM_DESC(cdrom, "force device as a CD-ROM"); 893 894struct chs_geom { 895 unsigned int cyl; 896 u8 head; 897 u8 sect; 898}; 899 900static unsigned int ide_disks; 901static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES]; 902 903static int ide_set_disk_chs(const char *str, struct kernel_param *kp) 904{ 905 int a, b, c = 0, h = 0, s = 0, i, j = 1; 906 907 if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 && 908 sscanf(str, "%d.%d:%d", &a, &b, &j) != 3) 909 return -EINVAL; 910 911 i = a * MAX_DRIVES + b; 912 913 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1) 914 return -EINVAL; 915 916 if (c > INT_MAX || h > 255 || s > 255) 917 return -EINVAL; 918 919 if (j) 920 ide_disks |= (1 << i); 921 else 922 ide_disks &= (1 << i); 923 924 ide_disks_chs[i].cyl = c; 925 ide_disks_chs[i].head = h; 926 ide_disks_chs[i].sect = s; 927 928 return 0; 929} 930 931module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0); 932MODULE_PARM_DESC(chs, "force device as a disk (using CHS)"); 933 934static void ide_dev_apply_params(ide_drive_t *drive) 935{ 936 int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit; 937 938 if (ide_nodma & (1 << i)) { 939 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name); 940 drive->nodma = 1; 941 } 942 if (ide_noflush & (1 << i)) { 943 printk(KERN_INFO "ide: disabling flush requests for %s\n", 944 drive->name); 945 drive->noflush = 1; 946 } 947 if (ide_noprobe & (1 << i)) { 948 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name); 949 drive->noprobe = 1; 950 } 951 if (ide_nowerr & (1 << i)) { 952 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n", 953 drive->name); 954 drive->bad_wstat = BAD_R_STAT; 955 } 956 if (ide_cdroms & (1 << i)) { 957 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name); 958 drive->present = 1; 959 drive->media = ide_cdrom; 960 /* an ATAPI device ignores DRDY */ 961 drive->ready_stat = 0; 962 } 963 if (ide_disks & (1 << i)) { 964 drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl; 965 drive->head = drive->bios_head = ide_disks_chs[i].head; 966 drive->sect = drive->bios_sect = ide_disks_chs[i].sect; 967 drive->forced_geom = 1; 968 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n", 969 drive->name, 970 drive->cyl, drive->head, drive->sect); 971 drive->present = 1; 972 drive->media = ide_disk; 973 drive->ready_stat = READY_STAT; 974 } 975} 976 977static unsigned int ide_ignore_cable; 978 979static int ide_set_ignore_cable(const char *s, struct kernel_param *kp) 980{ 981 int i, j = 1; 982 983 if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1) 984 return -EINVAL; 985 986 if (i >= MAX_HWIFS || j < 0 || j > 1) 987 return -EINVAL; 988 989 if (j) 990 ide_ignore_cable |= (1 << i); 991 else 992 ide_ignore_cable &= (1 << i); 993 994 return 0; 995} 996 997module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0); 998MODULE_PARM_DESC(ignore_cable, "ignore cable detection"); 999 1000void ide_port_apply_params(ide_hwif_t *hwif) 1001{ 1002 int i; 1003 1004 if (ide_ignore_cable & (1 << hwif->index)) { 1005 printk(KERN_INFO "ide: ignoring cable detection for %s\n", 1006 hwif->name); 1007 hwif->cbl = ATA_CBL_PATA40_SHORT; 1008 } 1009 1010 for (i = 0; i < MAX_DRIVES; i++) 1011 ide_dev_apply_params(&hwif->drives[i]); 1012} 1013 1014/* 1015 * This is gets invoked once during initialization, to set *everything* up 1016 */ 1017static int __init ide_init(void) 1018{ 1019 int ret; 1020 1021 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n"); 1022 1023 ret = bus_register(&ide_bus_type); 1024 if (ret < 0) { 1025 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret); 1026 return ret; 1027 } 1028 1029 ide_port_class = class_create(THIS_MODULE, "ide_port"); 1030 if (IS_ERR(ide_port_class)) { 1031 ret = PTR_ERR(ide_port_class); 1032 goto out_port_class; 1033 } 1034 1035 proc_ide_create(); 1036 1037 return 0; 1038 1039out_port_class: 1040 bus_unregister(&ide_bus_type); 1041 1042 return ret; 1043} 1044 1045static void __exit ide_exit(void) 1046{ 1047 proc_ide_destroy(); 1048 1049 class_destroy(ide_port_class); 1050 1051 bus_unregister(&ide_bus_type); 1052} 1053 1054module_init(ide_init); 1055module_exit(ide_exit); 1056 1057MODULE_LICENSE("GPL"); 1058