drivers/ide/ide.c

   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 struct class *ide_port_class;
  64
  65 /*
  66  *      Locks for IDE setting functionality
  67  */
  68
  69 DEFINE_MUTEX(ide_setting_mtx);
  70
  71 ide_devset_get(io_32bit, io_32bit);
  72
  73 static int set_io_32bit(ide_drive_t *drive, int arg)
  74 {
  75         if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT)
  76                 return -EPERM;
  77
  78         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
  79                 return -EINVAL;
  80
  81         drive->io_32bit = arg;
  82
  83         return 0;
  84 }
  85
  86 ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS);
  87
  88 static int set_ksettings(ide_drive_t *drive, int arg)
  89 {
  90         if (arg < 0 || arg > 1)
  91                 return -EINVAL;
  92
  93         if (arg)
  94                 drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS;
  95         else
  96                 drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS;
  97
  98         return 0;
  99 }
 100
 101 ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA);
 102
 103 static int set_using_dma(ide_drive_t *drive, int arg)
 104 {
 105 #ifdef CONFIG_BLK_DEV_IDEDMA
 106         int err = -EPERM;
 107
 108         if (arg < 0 || arg > 1)
 109                 return -EINVAL;
 110
 111         if (ata_id_has_dma(drive->id) == 0)
 112                 goto out;
 113
 114         if (drive->hwif->dma_ops == NULL)
 115                 goto out;
 116
 117         err = 0;
 118
 119         if (arg) {
 120                 if (ide_set_dma(drive))
 121                         err = -EIO;
 122         } else
 123                 ide_dma_off(drive);
 124
 125 out:
 126         return err;
 127 #else
 128         if (arg < 0 || arg > 1)
 129                 return -EINVAL;
 130
 131         return -EPERM;
 132 #endif
 133 }
 134
 135 /*
 136  * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
 137  */
 138 static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
 139 {
 140         switch (req_pio) {
 141         case 202:
 142         case 201:
 143         case 200:
 144         case 102:
 145         case 101:
 146         case 100:
 147                 return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
 148         case 9:
 149         case 8:
 150                 return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
 151         case 7:
 152         case 6:
 153                 return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
 154         default:
 155                 return 0;
 156         }
 157 }
 158
 159 static int set_pio_mode(ide_drive_t *drive, int arg)
 160 {
 161         ide_hwif_t *hwif = drive->hwif;
 162         const struct ide_port_ops *port_ops = hwif->port_ops;
 163
 164         if (arg < 0 || arg > 255)
 165                 return -EINVAL;
 166
 167         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 168             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 169                 return -ENOSYS;
 170
 171         if (set_pio_mode_abuse(drive->hwif, arg)) {
 172                 if (arg == 8 || arg == 9) {
 173                         unsigned long flags;
 174
 175                         /* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
 176                         spin_lock_irqsave(&hwif->lock, flags);
 177                         port_ops->set_pio_mode(drive, arg);
 178                         spin_unlock_irqrestore(&hwif->lock, flags);
 179                 } else
 180                         port_ops->set_pio_mode(drive, arg);
 181         } else {
 182                 int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
 183
 184                 ide_set_pio(drive, arg);
 185
 186                 if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
 187                         if (keep_dma)
 188                                 ide_dma_on(drive);
 189                 }
 190         }
 191
 192         return 0;
 193 }
 194
 195 ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK);
 196
 197 static int set_unmaskirq(ide_drive_t *drive, int arg)
 198 {
 199         if (drive->dev_flags & IDE_DFLAG_NO_UNMASK)
 200                 return -EPERM;
 201
 202         if (arg < 0 || arg > 1)
 203                 return -EINVAL;
 204
 205         if (arg)
 206                 drive->dev_flags |= IDE_DFLAG_UNMASK;
 207         else
 208                 drive->dev_flags &= ~IDE_DFLAG_UNMASK;
 209
 210         return 0;
 211 }
 212
 213 ide_ext_devset_rw_sync(io_32bit, io_32bit);
 214 ide_ext_devset_rw_sync(keepsettings, ksettings);
 215 ide_ext_devset_rw_sync(unmaskirq, unmaskirq);
 216 ide_ext_devset_rw_sync(using_dma, using_dma);
 217 __IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode);
 218
 219 /**
 220  * ide_device_get       -       get an additional reference to a ide_drive_t
 221  * @drive:      device to get a reference to
 222  *
 223  * Gets a reference to the ide_drive_t and increments the use count of the
 224  * underlying LLDD module.
 225  */
 226 int ide_device_get(ide_drive_t *drive)
 227 {
 228         struct device *host_dev;
 229         struct module *module;
 230
 231         if (!get_device(&drive->gendev))
 232                 return -ENXIO;
 233
 234         host_dev = drive->hwif->host->dev[0];
 235         module = host_dev ? host_dev->driver->owner : NULL;
 236
 237         if (module && !try_module_get(module)) {
 238                 put_device(&drive->gendev);
 239                 return -ENXIO;
 240         }
 241
 242         return 0;
 243 }
 244 EXPORT_SYMBOL_GPL(ide_device_get);
 245
 246 /**
 247  * ide_device_put       -       release a reference to a ide_drive_t
 248  * @drive:      device to release a reference on
 249  *
 250  * Release a reference to the ide_drive_t and decrements the use count of
 251  * the underlying LLDD module.
 252  */
 253 void ide_device_put(ide_drive_t *drive)
 254 {
 255 #ifdef CONFIG_MODULE_UNLOAD
 256         struct device *host_dev = drive->hwif->host->dev[0];
 257         struct module *module = host_dev ? host_dev->driver->owner : NULL;
 258
 259         if (module)
 260                 module_put(module);
 261 #endif
 262         put_device(&drive->gendev);
 263 }
 264 EXPORT_SYMBOL_GPL(ide_device_put);
 265
 266 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 267 {
 268         return 1;
 269 }
 270
 271 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 272 {
 273         ide_drive_t *drive = to_ide_device(dev);
 274
 275         add_uevent_var(env, "MEDIA=%s", ide_media_string(drive));
 276         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 277         add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive));
 278         return 0;
 279 }
 280
 281 static int generic_ide_probe(struct device *dev)
 282 {
 283         ide_drive_t *drive = to_ide_device(dev);
 284         ide_driver_t *drv = to_ide_driver(dev->driver);
 285
 286         return drv->probe ? drv->probe(drive) : -ENODEV;
 287 }
 288
 289 static int generic_ide_remove(struct device *dev)
 290 {
 291         ide_drive_t *drive = to_ide_device(dev);
 292         ide_driver_t *drv = to_ide_driver(dev->driver);
 293
 294         if (drv->remove)
 295                 drv->remove(drive);
 296
 297         return 0;
 298 }
 299
 300 static void generic_ide_shutdown(struct device *dev)
 301 {
 302         ide_drive_t *drive = to_ide_device(dev);
 303         ide_driver_t *drv = to_ide_driver(dev->driver);
 304
 305         if (dev->driver && drv->shutdown)
 306                 drv->shutdown(drive);
 307 }
 308
 309 struct bus_type ide_bus_type = {
 310         .name           = "ide",
 311         .match          = ide_bus_match,
 312         .uevent         = ide_uevent,
 313         .probe          = generic_ide_probe,
 314         .remove         = generic_ide_remove,
 315         .shutdown       = generic_ide_shutdown,
 316         .dev_attrs      = ide_dev_attrs,
 317         .suspend        = generic_ide_suspend,
 318         .resume         = generic_ide_resume,
 319 };
 320
 321 EXPORT_SYMBOL_GPL(ide_bus_type);
 322
 323 int ide_vlb_clk;
 324 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 325
 326 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 327 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 328
 329 int ide_pci_clk;
 330 EXPORT_SYMBOL_GPL(ide_pci_clk);
 331
 332 module_param_named(pci_clock, ide_pci_clk, int, 0);
 333 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 334
 335 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 336 {
 337         int a, b, i, j = 1;
 338         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 339
 340         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 341             sscanf(s, "%d.%d", &a, &b) != 2)
 342                 return -EINVAL;
 343
 344         i = a * MAX_DRIVES + b;
 345
 346         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 347                 return -EINVAL;
 348
 349         if (j)
 350                 *dev_param_mask |= (1 << i);
 351         else
 352                 *dev_param_mask &= (1 << i);
 353
 354         return 0;
 355 }
 356
 357 static unsigned int ide_nodma;
 358
 359 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 360 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 361
 362 static unsigned int ide_noflush;
 363
 364 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 365 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 366
 367 static unsigned int ide_noprobe;
 368
 369 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 370 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 371
 372 static unsigned int ide_nowerr;
 373
 374 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 375 MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
 376
 377 static unsigned int ide_cdroms;
 378
 379 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 380 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 381
 382 struct chs_geom {
 383         unsigned int    cyl;
 384         u8              head;
 385         u8              sect;
 386 };
 387
 388 static unsigned int ide_disks;
 389 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 390
 391 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 392 {
 393         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 394
 395         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 396             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 397                 return -EINVAL;
 398
 399         i = a * MAX_DRIVES + b;
 400
 401         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 402                 return -EINVAL;
 403
 404         if (c > INT_MAX || h > 255 || s > 255)
 405                 return -EINVAL;
 406
 407         if (j)
 408                 ide_disks |= (1 << i);
 409         else
 410                 ide_disks &= (1 << i);
 411
 412         ide_disks_chs[i].cyl  = c;
 413         ide_disks_chs[i].head = h;
 414         ide_disks_chs[i].sect = s;
 415
 416         return 0;
 417 }
 418
 419 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 420 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 421
 422 static void ide_dev_apply_params(ide_drive_t *drive, u8 unit)
 423 {
 424         int i = drive->hwif->index * MAX_DRIVES + unit;
 425
 426         if (ide_nodma & (1 << i)) {
 427                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 428                 drive->dev_flags |= IDE_DFLAG_NODMA;
 429         }
 430         if (ide_noflush & (1 << i)) {
 431                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 432                                  drive->name);
 433                 drive->dev_flags |= IDE_DFLAG_NOFLUSH;
 434         }
 435         if (ide_noprobe & (1 << i)) {
 436                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 437                 drive->dev_flags |= IDE_DFLAG_NOPROBE;
 438         }
 439         if (ide_nowerr & (1 << i)) {
 440                 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
 441                                  drive->name);
 442                 drive->bad_wstat = BAD_R_STAT;
 443         }
 444         if (ide_cdroms & (1 << i)) {
 445                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 446                 drive->dev_flags |= IDE_DFLAG_PRESENT;
 447                 drive->media = ide_cdrom;
 448                 /* an ATAPI device ignores DRDY */
 449                 drive->ready_stat = 0;
 450         }
 451         if (ide_disks & (1 << i)) {
 452                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 453                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 454                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 455
 456                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 457                                  drive->name,
 458                                  drive->cyl, drive->head, drive->sect);
 459
 460                 drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT;
 461                 drive->media = ide_disk;
 462                 drive->ready_stat = ATA_DRDY;
 463         }
 464 }
 465
 466 static unsigned int ide_ignore_cable;
 467
 468 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 469 {
 470         int i, j = 1;
 471
 472         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 473                 return -EINVAL;
 474
 475         if (i >= MAX_HWIFS || j < 0 || j > 1)
 476                 return -EINVAL;
 477
 478         if (j)
 479                 ide_ignore_cable |= (1 << i);
 480         else
 481                 ide_ignore_cable &= (1 << i);
 482
 483         return 0;
 484 }
 485
 486 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 487 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 488
 489 void ide_port_apply_params(ide_hwif_t *hwif)
 490 {
 491         int i;
 492
 493         if (ide_ignore_cable & (1 << hwif->index)) {
 494                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
 495                                  hwif->name);
 496                 hwif->cbl = ATA_CBL_PATA40_SHORT;
 497         }
 498
 499         for (i = 0; i < MAX_DRIVES; i++)
 500                 ide_dev_apply_params(&hwif->drives[i], i);
 501 }
 502
 503 /*
 504  * This is gets invoked once during initialization, to set *everything* up
 505  */
 506 static int __init ide_init(void)
 507 {
 508         int ret;
 509
 510         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
 511
 512         ret = bus_register(&ide_bus_type);
 513         if (ret < 0) {
 514                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
 515                 return ret;
 516         }
 517
 518         ide_port_class = class_create(THIS_MODULE, "ide_port");
 519         if (IS_ERR(ide_port_class)) {
 520                 ret = PTR_ERR(ide_port_class);
 521                 goto out_port_class;
 522         }
 523
 524         proc_ide_create();
 525
 526         return 0;
 527
 528 out_port_class:
 529         bus_unregister(&ide_bus_type);
 530
 531         return ret;
 532 }
 533
 534 static void __exit ide_exit(void)
 535 {
 536         proc_ide_destroy();
 537
 538         class_destroy(ide_port_class);
 539
 540         bus_unregister(&ide_bus_type);
 541 }
 542
 543 module_init(ide_init);
 544 module_exit(ide_exit);
 545
 546 MODULE_LICENSE("GPL");