drivers/ide/ide.c

   1 /*
   2  *  linux/drivers/ide/ide.c             Version 7.00beta2       Mar 05 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  */
   6
   7 /*
   8  *  Mostly written by Mark Lord  <mlord@pobox.com>
   9  *                and Gadi Oxman <gadio@netvision.net.il>
  10  *                and Andre Hedrick <andre@linux-ide.org>
  11  *
  12  *  See linux/MAINTAINERS for address of current maintainer.
  13  *
  14  * This is the multiple IDE interface driver, as evolved from hd.c.
  15  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  16  *   (usually 14 & 15).
  17  * There can be up to two drives per interface, as per the ATA-2 spec.
  18  *
  19  * Primary:    ide0, port 0x1f0; major=3;  hda is minor=0; hdb is minor=64
  20  * Secondary:  ide1, port 0x170; major=22; hdc is minor=0; hdd is minor=64
  21  * Tertiary:   ide2, port 0x???; major=33; hde is minor=0; hdf is minor=64
  22  * Quaternary: ide3, port 0x???; major=34; hdg is minor=0; hdh is minor=64
  23  * ...
  24  *
  25  *  From hd.c:
  26  *  |
  27  *  | It traverses the request-list, using interrupts to jump between functions.
  28  *  | As nearly all functions can be called within interrupts, we may not sleep.
  29  *  | Special care is recommended.  Have Fun!
  30  *  |
  31  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  32  *  |
  33  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  34  *  | in the early extended-partition checks and added DM partitions.
  35  *  |
  36  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  37  *  |
  38  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  39  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  40  *
  41  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  42  *
  43  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  44  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  45  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  46  *
  47  *  This was a rewrite of just about everything from hd.c, though some original
  48  *  code is still sprinkled about.  Think of it as a major evolution, with
  49  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  50  *
  51  *  Version 1.0 ALPHA   initial code, primary i/f working okay
  52  *  Version 1.3 BETA    dual i/f on shared irq tested & working!
  53  *  Version 1.4 BETA    added auto probing for irq(s)
  54  *  Version 1.5 BETA    added ALPHA (untested) support for IDE cd-roms,
  55  *  ...
  56  * Version 5.50         allow values as small as 20 for idebus=
  57  * Version 5.51         force non io_32bit in drive_cmd_intr()
  58  *                      change delay_10ms() to delay_50ms() to fix problems
  59  * Version 5.52         fix incorrect invalidation of removable devices
  60  *                      add "hdx=slow" command line option
  61  * Version 5.60         start to modularize the driver; the disk and ATAPI
  62  *                       drivers can be compiled as loadable modules.
  63  *                      move IDE probe code to ide-probe.c
  64  *                      move IDE disk code to ide-disk.c
  65  *                      add support for generic IDE device subdrivers
  66  *                      add m68k code from Geert Uytterhoeven
  67  *                      probe all interfaces by default
  68  *                      add ioctl to (re)probe an interface
  69  * Version 6.00         use per device request queues
  70  *                      attempt to optimize shared hwgroup performance
  71  *                      add ioctl to manually adjust bandwidth algorithms
  72  *                      add kerneld support for the probe module
  73  *                      fix bug in ide_error()
  74  *                      fix bug in the first ide_get_lock() call for Atari
  75  *                      don't flush leftover data for ATAPI devices
  76  * Version 6.01         clear hwgroup->active while the hwgroup sleeps
  77  *                      support HDIO_GETGEO for floppies
  78  * Version 6.02         fix ide_ack_intr() call
  79  *                      check partition table on floppies
  80  * Version 6.03         handle bad status bit sequencing in ide_wait_stat()
  81  * Version 6.10         deleted old entries from this list of updates
  82  *                      replaced triton.c with ide-dma.c generic PCI DMA
  83  *                      added support for BIOS-enabled UltraDMA
  84  *                      rename all "promise" things to "pdc4030"
  85  *                      fix EZ-DRIVE handling on small disks
  86  * Version 6.11         fix probe error in ide_scan_devices()
  87  *                      fix ancient "jiffies" polling bugs
  88  *                      mask all hwgroup interrupts on each irq entry
  89  * Version 6.12         integrate ioctl and proc interfaces
  90  *                      fix parsing of "idex=" command line parameter
  91  * Version 6.13         add support for ide4/ide5 courtesy rjones@orchestream.com
  92  * Version 6.14         fixed IRQ sharing among PCI devices
  93  * Version 6.15         added SMP awareness to IDE drivers
  94  * Version 6.16         fixed various bugs; even more SMP friendly
  95  * Version 6.17         fix for newest EZ-Drive problem
  96  * Version 6.18         default unpartitioned-disk translation now "BIOS LBA"
  97  * Version 6.19         Re-design for a UNIFORM driver for all platforms,
  98  *                        model based on suggestions from Russell King and
  99  *                        Geert Uytterhoeven
 100  *                      Promise DC4030VL now supported.
 101  *                      add support for ide6/ide7
 102  *                      delay_50ms() changed to ide_delay_50ms() and exported.
 103  * Version 6.20         Added/Fixed Generic ATA-66 support and hwif detection.
 104  *                      Added hdx=flash to allow for second flash disk
 105  *                        detection w/o the hang loop.
 106  *                      Added support for ide8/ide9
 107  *                      Added idex=ata66 for the quirky chipsets that are
 108  *                        ATA-66 compliant, but have yet to determine a method
 109  *                        of verification of the 80c cable presence.
 110  *                        Specifically Promise's PDC20262 chipset.
 111  * Version 6.21         Fixing/Fixed SMP spinlock issue with insight from an old
 112  *                        hat that clarified original low level driver design.
 113  * Version 6.30         Added SMP support; fixed multmode issues.  -ml
 114  * Version 6.31         Debug Share INTR's and request queue streaming
 115  *                      Native ATA-100 support
 116  *                      Prep for Cascades Project
 117  * Version 7.00alpha    First named revision of ide rearrange
 118  *
 119  *  Some additional driver compile-time options are in ./include/linux/ide.h
 120  *
 121  *  To do, in likely order of completion:
 122  *      - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
 123  *
 124  */
 125
 126 #define REVISION        "Revision: 7.00alpha2"
 127 #define VERSION         "Id: ide.c 7.00a2 20020906"
 128
 129 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
 130
 131 #define _IDE_C                  /* Tell ide.h it's really us */
 132
 133 #include <linux/config.h>
 134 #include <linux/module.h>
 135 #include <linux/types.h>
 136 #include <linux/string.h>
 137 #include <linux/kernel.h>
 138 #include <linux/timer.h>
 139 #include <linux/mm.h>
 140 #include <linux/interrupt.h>
 141 #include <linux/major.h>
 142 #include <linux/errno.h>
 143 #include <linux/genhd.h>
 144 #include <linux/blkpg.h>
 145 #include <linux/slab.h>
 146 #include <linux/init.h>
 147 #include <linux/pci.h>
 148 #include <linux/delay.h>
 149 #include <linux/ide.h>
 150 #include <linux/devfs_fs_kernel.h>
 151 #include <linux/completion.h>
 152 #include <linux/reboot.h>
 153 #include <linux/cdrom.h>
 154 #include <linux/seq_file.h>
 155 #include <linux/device.h>
 156 #include <linux/bitops.h>
 157
 158 #include <asm/byteorder.h>
 159 #include <asm/irq.h>
 160 #include <asm/uaccess.h>
 161 #include <asm/io.h>
 162
 163
 164 /* default maximum number of failures */
 165 #define IDE_DEFAULT_MAX_FAILURES        1
 166
 167 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
 168                                         IDE2_MAJOR, IDE3_MAJOR,
 169                                         IDE4_MAJOR, IDE5_MAJOR,
 170                                         IDE6_MAJOR, IDE7_MAJOR,
 171                                         IDE8_MAJOR, IDE9_MAJOR };
 172
 173 static int idebus_parameter;    /* holds the "idebus=" parameter */
 174 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
 175 static int initializing;        /* set while initializing built-in drivers */
 176
 177 DECLARE_MUTEX(ide_cfg_sem);
 178  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
 179
 180 #ifdef CONFIG_BLK_DEV_IDEPCI
 181 static int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
 182 #endif
 183
 184 #ifdef CONFIG_IDEDMA_AUTO
 185 int noautodma = 0;
 186 #else
 187 int noautodma = 1;
 188 #endif
 189
 190 EXPORT_SYMBOL(noautodma);
 191
 192 /*
 193  * This is declared extern in ide.h, for access by other IDE modules:
 194  */
 195 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 196
 197 EXPORT_SYMBOL(ide_hwifs);
 198
 199 extern ide_driver_t idedefault_driver;
 200 static void setup_driver_defaults(ide_driver_t *driver);
 201
 202 /*
 203  * Do not even *think* about calling this!
 204  */
 205 static void init_hwif_data(ide_hwif_t *hwif, unsigned int index)
 206 {
 207         unsigned int unit;
 208
 209         /* bulk initialize hwif & drive info with zeros */
 210         memset(hwif, 0, sizeof(ide_hwif_t));
 211
 212         /* fill in any non-zero initial values */
 213         hwif->index     = index;
 214         hwif->major     = ide_hwif_to_major[index];
 215
 216         hwif->name[0]   = 'i';
 217         hwif->name[1]   = 'd';
 218         hwif->name[2]   = 'e';
 219         hwif->name[3]   = '0' + index;
 220
 221         hwif->bus_state = BUSSTATE_ON;
 222
 223         hwif->atapi_dma = 0;            /* disable all atapi dma */
 224         hwif->ultra_mask = 0x80;        /* disable all ultra */
 225         hwif->mwdma_mask = 0x80;        /* disable all mwdma */
 226         hwif->swdma_mask = 0x80;        /* disable all swdma */
 227
 228         sema_init(&hwif->gendev_rel_sem, 0);
 229
 230         default_hwif_iops(hwif);
 231         default_hwif_transport(hwif);
 232         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 233                 ide_drive_t *drive = &hwif->drives[unit];
 234
 235                 drive->media                    = ide_disk;
 236                 drive->select.all               = (unit<<4)|0xa0;
 237                 drive->hwif                     = hwif;
 238                 drive->ctl                      = 0x08;
 239                 drive->ready_stat               = READY_STAT;
 240                 drive->bad_wstat                = BAD_W_STAT;
 241                 drive->special.b.recalibrate    = 1;
 242                 drive->special.b.set_geometry   = 1;
 243                 drive->name[0]                  = 'h';
 244                 drive->name[1]                  = 'd';
 245                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
 246                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 247                 drive->using_dma                = 0;
 248                 drive->is_flash                 = 0;
 249                 drive->driver                   = &idedefault_driver;
 250                 drive->vdma                     = 0;
 251                 INIT_LIST_HEAD(&drive->list);
 252                 sema_init(&drive->gendev_rel_sem, 0);
 253         }
 254 }
 255
 256 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 257 {
 258         hw_regs_t hw;
 259
 260         memset(&hw, 0, sizeof(hw_regs_t));
 261
 262         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 263
 264         memcpy(&hwif->hw, &hw, sizeof(hw));
 265         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 266
 267         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 268 #ifdef CONFIG_BLK_DEV_HD
 269         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 270                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 271 #endif
 272 }
 273
 274 extern void ide_arm_init(void);
 275
 276 /*
 277  * init_ide_data() sets reasonable default values into all fields
 278  * of all instances of the hwifs and drives, but only on the first call.
 279  * Subsequent calls have no effect (they don't wipe out anything).
 280  *
 281  * This routine is normally called at driver initialization time,
 282  * but may also be called MUCH earlier during kernel "command-line"
 283  * parameter processing.  As such, we cannot depend on any other parts
 284  * of the kernel (such as memory allocation) to be functioning yet.
 285  *
 286  * This is too bad, as otherwise we could dynamically allocate the
 287  * ide_drive_t structs as needed, rather than always consuming memory
 288  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 289  *
 290  * FIXME: We should stuff the setup data into __init and copy the
 291  * relevant hwifs/allocate them properly during boot.
 292  */
 293 #define MAGIC_COOKIE 0x12345678
 294 static void __init init_ide_data (void)
 295 {
 296         ide_hwif_t *hwif;
 297         unsigned int index;
 298         static unsigned long magic_cookie = MAGIC_COOKIE;
 299
 300         if (magic_cookie != MAGIC_COOKIE)
 301                 return;         /* already initialized */
 302         magic_cookie = 0;
 303
 304         setup_driver_defaults(&idedefault_driver);
 305
 306         /* Initialise all interface structures */
 307         for (index = 0; index < MAX_HWIFS; ++index) {
 308                 hwif = &ide_hwifs[index];
 309                 init_hwif_data(hwif, index);
 310                 init_hwif_default(hwif, index);
 311 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 312                 hwif->irq = hwif->hw.irq =
 313                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 314 #endif
 315         }
 316 #ifdef CONFIG_IDE_ARM
 317         initializing = 1;
 318         ide_arm_init();
 319         initializing = 0;
 320 #endif
 321 }
 322
 323 /**
 324  *      ide_system_bus_speed    -       guess bus speed
 325  *
 326  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 327  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 328  *      The default is 40 for known PCI systems, 50 otherwise.
 329  *      The "idebus=xx" parameter can be used to override this value.
 330  *      The actual value to be used is computed/displayed the first time
 331  *      through. Drivers should only use this as a last resort.
 332  *
 333  *      Returns a guessed speed in MHz.
 334  */
 335
 336 static int ide_system_bus_speed(void)
 337 {
 338 #ifdef CONFIG_PCI
 339         static struct pci_device_id pci_default[] = {
 340                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 341                 { }
 342         };
 343 #else
 344 #define pci_default 0
 345 #endif /* CONFIG_PCI */
 346
 347         if (!system_bus_speed) {
 348                 if (idebus_parameter) {
 349                         /* user supplied value */
 350                         system_bus_speed = idebus_parameter;
 351                 } else if (pci_dev_present(pci_default)) {
 352                         /* safe default value for PCI */
 353                         system_bus_speed = 33;
 354                 } else {
 355                         /* safe default value for VESA and PCI */
 356                         system_bus_speed = 50;
 357                 }
 358                 printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
 359                         "for PIO modes%s\n", system_bus_speed,
 360                         idebus_parameter ? "" : "; override with idebus=xx");
 361         }
 362         return system_bus_speed;
 363 }
 364
 365 static int ide_open (struct inode * inode, struct file * filp)
 366 {
 367         return -ENXIO;
 368 }
 369
 370 /*
 371  *      drives_lock protects the list of drives, drivers_lock the
 372  *      list of drivers.  Currently nobody takes both at once.
 373  */
 374
 375 static DEFINE_SPINLOCK(drives_lock);
 376 static DEFINE_SPINLOCK(drivers_lock);
 377 static LIST_HEAD(drivers);
 378
 379 /* Iterator for the driver list. */
 380
 381 static void *m_start(struct seq_file *m, loff_t *pos)
 382 {
 383         struct list_head *p;
 384         loff_t l = *pos;
 385         spin_lock(&drivers_lock);
 386         list_for_each(p, &drivers)
 387                 if (!l--)
 388                         return list_entry(p, ide_driver_t, drivers);
 389         return NULL;
 390 }
 391
 392 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 393 {
 394         struct list_head *p = ((ide_driver_t *)v)->drivers.next;
 395         (*pos)++;
 396         return p==&drivers ? NULL : list_entry(p, ide_driver_t, drivers);
 397 }
 398
 399 static void m_stop(struct seq_file *m, void *v)
 400 {
 401         spin_unlock(&drivers_lock);
 402 }
 403
 404 static int show_driver(struct seq_file *m, void *v)
 405 {
 406         ide_driver_t *driver = v;
 407         seq_printf(m, "%s version %s\n", driver->name, driver->version);
 408         return 0;
 409 }
 410
 411 struct seq_operations ide_drivers_op = {
 412         .start  = m_start,
 413         .next   = m_next,
 414         .stop   = m_stop,
 415         .show   = show_driver
 416 };
 417
 418 #ifdef CONFIG_PROC_FS
 419 struct proc_dir_entry *proc_ide_root;
 420
 421 static ide_proc_entry_t generic_subdriver_entries[] = {
 422         { "capacity",   S_IFREG|S_IRUGO,        proc_ide_read_capacity, NULL },
 423         { NULL, 0, NULL, NULL }
 424 };
 425 #endif
 426
 427 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 428                                             unsigned long addr, int num)
 429 {
 430         struct resource *res = request_region(addr, num, hwif->name);
 431
 432         if (!res)
 433                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 434                                 hwif->name, addr, addr+num-1);
 435         return res;
 436 }
 437
 438 /**
 439  *      ide_hwif_request_regions - request resources for IDE
 440  *      @hwif: interface to use
 441  *
 442  *      Requests all the needed resources for an interface.
 443  *      Right now core IDE code does this work which is deeply wrong.
 444  *      MMIO leaves it to the controller driver,
 445  *      PIO will migrate this way over time.
 446  */
 447
 448 int ide_hwif_request_regions(ide_hwif_t *hwif)
 449 {
 450         unsigned long addr;
 451         unsigned int i;
 452
 453         if (hwif->mmio == 2)
 454                 return 0;
 455         BUG_ON(hwif->mmio == 1);
 456         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 457         if (addr && !hwif_request_region(hwif, addr, 1))
 458                 goto control_region_busy;
 459         hwif->straight8 = 0;
 460         addr = hwif->io_ports[IDE_DATA_OFFSET];
 461         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 462                 if (!hwif_request_region(hwif, addr, 8))
 463                         goto data_region_busy;
 464                 hwif->straight8 = 1;
 465                 return 0;
 466         }
 467         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 468                 addr = hwif->io_ports[i];
 469                 if (!hwif_request_region(hwif, addr, 1)) {
 470                         while (--i)
 471                                 release_region(addr, 1);
 472                         goto data_region_busy;
 473                 }
 474         }
 475         return 0;
 476
 477 data_region_busy:
 478         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 479         if (addr)
 480                 release_region(addr, 1);
 481 control_region_busy:
 482         /* If any errors are return, we drop the hwif interface. */
 483         return -EBUSY;
 484 }
 485
 486 /**
 487  *      ide_hwif_release_regions - free IDE resources
 488  *
 489  *      Note that we only release the standard ports,
 490  *      and do not even try to handle any extra ports
 491  *      allocated for weird IDE interface chipsets.
 492  *
 493  *      Note also that we don't yet handle mmio resources here. More
 494  *      importantly our caller should be doing this so we need to
 495  *      restructure this as a helper function for drivers.
 496  */
 497
 498 void ide_hwif_release_regions(ide_hwif_t *hwif)
 499 {
 500         u32 i = 0;
 501
 502         if (hwif->mmio == 2)
 503                 return;
 504         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 505                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 506         if (hwif->straight8) {
 507                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 508                 return;
 509         }
 510         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 511                 if (hwif->io_ports[i])
 512                         release_region(hwif->io_ports[i], 1);
 513 }
 514
 515 /**
 516  *      ide_hwif_restore        -       restore hwif to template
 517  *      @hwif: hwif to update
 518  *      @tmp_hwif: template
 519  *
 520  *      Restore hwif to a previous state by copying most settngs
 521  *      from the template.
 522  */
 523
 524 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 525 {
 526         hwif->hwgroup                   = tmp_hwif->hwgroup;
 527
 528         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 529
 530         hwif->proc                      = tmp_hwif->proc;
 531
 532         hwif->major                     = tmp_hwif->major;
 533         hwif->straight8                 = tmp_hwif->straight8;
 534         hwif->bus_state                 = tmp_hwif->bus_state;
 535
 536         hwif->atapi_dma                 = tmp_hwif->atapi_dma;
 537         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 538         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 539         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 540
 541         hwif->chipset                   = tmp_hwif->chipset;
 542         hwif->hold                      = tmp_hwif->hold;
 543
 544 #ifdef CONFIG_BLK_DEV_IDEPCI
 545         hwif->pci_dev                   = tmp_hwif->pci_dev;
 546         hwif->cds                       = tmp_hwif->cds;
 547 #endif
 548
 549         hwif->tuneproc                  = tmp_hwif->tuneproc;
 550         hwif->speedproc                 = tmp_hwif->speedproc;
 551         hwif->selectproc                = tmp_hwif->selectproc;
 552         hwif->reset_poll                = tmp_hwif->reset_poll;
 553         hwif->pre_reset                 = tmp_hwif->pre_reset;
 554         hwif->resetproc                 = tmp_hwif->resetproc;
 555         hwif->intrproc                  = tmp_hwif->intrproc;
 556         hwif->maskproc                  = tmp_hwif->maskproc;
 557         hwif->quirkproc                 = tmp_hwif->quirkproc;
 558         hwif->busproc                   = tmp_hwif->busproc;
 559
 560         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 561         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 562         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 563         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 564
 565         hwif->dma_setup                 = tmp_hwif->dma_setup;
 566         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 567         hwif->dma_start                 = tmp_hwif->dma_start;
 568         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 569         hwif->ide_dma_check             = tmp_hwif->ide_dma_check;
 570         hwif->ide_dma_on                = tmp_hwif->ide_dma_on;
 571         hwif->ide_dma_off_quietly       = tmp_hwif->ide_dma_off_quietly;
 572         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 573         hwif->ide_dma_host_on           = tmp_hwif->ide_dma_host_on;
 574         hwif->ide_dma_host_off          = tmp_hwif->ide_dma_host_off;
 575         hwif->ide_dma_lostirq           = tmp_hwif->ide_dma_lostirq;
 576         hwif->ide_dma_timeout           = tmp_hwif->ide_dma_timeout;
 577
 578         hwif->OUTB                      = tmp_hwif->OUTB;
 579         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 580         hwif->OUTW                      = tmp_hwif->OUTW;
 581         hwif->OUTL                      = tmp_hwif->OUTL;
 582         hwif->OUTSW                     = tmp_hwif->OUTSW;
 583         hwif->OUTSL                     = tmp_hwif->OUTSL;
 584
 585         hwif->INB                       = tmp_hwif->INB;
 586         hwif->INW                       = tmp_hwif->INW;
 587         hwif->INL                       = tmp_hwif->INL;
 588         hwif->INSW                      = tmp_hwif->INSW;
 589         hwif->INSL                      = tmp_hwif->INSL;
 590
 591         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 592
 593         hwif->mmio                      = tmp_hwif->mmio;
 594         hwif->rqsize                    = tmp_hwif->rqsize;
 595         hwif->no_lba48                  = tmp_hwif->no_lba48;
 596
 597 #ifndef CONFIG_BLK_DEV_IDECS
 598         hwif->irq                       = tmp_hwif->irq;
 599 #endif
 600
 601         hwif->dma_base                  = tmp_hwif->dma_base;
 602         hwif->dma_master                = tmp_hwif->dma_master;
 603         hwif->dma_command               = tmp_hwif->dma_command;
 604         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 605         hwif->dma_status                = tmp_hwif->dma_status;
 606         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 607         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 608
 609         hwif->dma_extra                 = tmp_hwif->dma_extra;
 610         hwif->config_data               = tmp_hwif->config_data;
 611         hwif->select_data               = tmp_hwif->select_data;
 612         hwif->autodma                   = tmp_hwif->autodma;
 613         hwif->udma_four                 = tmp_hwif->udma_four;
 614         hwif->no_dsc                    = tmp_hwif->no_dsc;
 615
 616         hwif->hwif_data                 = tmp_hwif->hwif_data;
 617 }
 618
 619 /**
 620  *      ide_unregister          -       free an ide interface
 621  *      @index: index of interface (will change soon to a pointer)
 622  *
 623  *      Perform the final unregister of an IDE interface. At the moment
 624  *      we don't refcount interfaces so this will also get split up.
 625  *
 626  *      Locking:
 627  *      The caller must not hold the IDE locks
 628  *      The drive present/vanishing is not yet properly locked
 629  *      Take care with the callbacks. These have been split to avoid
 630  *      deadlocking the IDE layer. The shutdown callback is called
 631  *      before we take the lock and free resources. It is up to the
 632  *      caller to be sure there is no pending I/O here, and that
 633  *      the interfce will not be reopened (present/vanishing locking
 634  *      isnt yet done btw). After we commit to the final kill we
 635  *      call the cleanup callback with the ide locks held.
 636  *
 637  *      Unregister restores the hwif structures to the default state.
 638  *      This is raving bonkers.
 639  */
 640
 641 void ide_unregister(unsigned int index)
 642 {
 643         ide_drive_t *drive;
 644         ide_hwif_t *hwif, *g;
 645         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_sem */
 646         ide_hwgroup_t *hwgroup;
 647         int irq_count = 0, unit, i;
 648
 649         BUG_ON(index >= MAX_HWIFS);
 650
 651         BUG_ON(in_interrupt());
 652         BUG_ON(irqs_disabled());
 653         down(&ide_cfg_sem);
 654         spin_lock_irq(&ide_lock);
 655         hwif = &ide_hwifs[index];
 656         if (!hwif->present)
 657                 goto abort;
 658         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 659                 drive = &hwif->drives[unit];
 660                 if (!drive->present)
 661                         continue;
 662                 if (drive->usage || DRIVER(drive)->busy)
 663                         goto abort;
 664                 drive->dead = 1;
 665         }
 666         hwif->present = 0;
 667
 668         spin_unlock_irq(&ide_lock);
 669
 670         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 671                 drive = &hwif->drives[unit];
 672                 if (!drive->present)
 673                         continue;
 674                 DRIVER(drive)->cleanup(drive);
 675         }
 676
 677         destroy_proc_ide_interface(hwif);
 678
 679         hwgroup = hwif->hwgroup;
 680         /*
 681          * free the irq if we were the only hwif using it
 682          */
 683         g = hwgroup->hwif;
 684         do {
 685                 if (g->irq == hwif->irq)
 686                         ++irq_count;
 687                 g = g->next;
 688         } while (g != hwgroup->hwif);
 689         if (irq_count == 1)
 690                 free_irq(hwif->irq, hwgroup);
 691
 692         spin_lock_irq(&ide_lock);
 693         /*
 694          * Note that we only release the standard ports,
 695          * and do not even try to handle any extra ports
 696          * allocated for weird IDE interface chipsets.
 697          */
 698         ide_hwif_release_regions(hwif);
 699
 700         /*
 701          * Remove us from the hwgroup, and free
 702          * the hwgroup if we were the only member
 703          */
 704         for (i = 0; i < MAX_DRIVES; ++i) {
 705                 drive = &hwif->drives[i];
 706                 if (drive->devfs_name[0] != '\0') {
 707                         devfs_remove(drive->devfs_name);
 708                         drive->devfs_name[0] = '\0';
 709                 }
 710                 if (!drive->present)
 711                         continue;
 712                 if (drive == drive->next) {
 713                         /* special case: last drive from hwgroup. */
 714                         BUG_ON(hwgroup->drive != drive);
 715                         hwgroup->drive = NULL;
 716                 } else {
 717                         ide_drive_t *walk;
 718
 719                         walk = hwgroup->drive;
 720                         while (walk->next != drive)
 721                                 walk = walk->next;
 722                         walk->next = drive->next;
 723                         if (hwgroup->drive == drive) {
 724                                 hwgroup->drive = drive->next;
 725                                 hwgroup->hwif = HWIF(hwgroup->drive);
 726                         }
 727                 }
 728                 BUG_ON(hwgroup->drive == drive);
 729                 if (drive->id != NULL) {
 730                         kfree(drive->id);
 731                         drive->id = NULL;
 732                 }
 733                 drive->present = 0;
 734                 /* Messed up locking ... */
 735                 spin_unlock_irq(&ide_lock);
 736                 blk_cleanup_queue(drive->queue);
 737                 device_unregister(&drive->gendev);
 738                 down(&drive->gendev_rel_sem);
 739                 spin_lock_irq(&ide_lock);
 740                 drive->queue = NULL;
 741         }
 742         if (hwif->next == hwif) {
 743                 BUG_ON(hwgroup->hwif != hwif);
 744                 kfree(hwgroup);
 745         } else {
 746                 /* There is another interface in hwgroup.
 747                  * Unlink us, and set hwgroup->drive and ->hwif to
 748                  * something sane.
 749                  */
 750                 g = hwgroup->hwif;
 751                 while (g->next != hwif)
 752                         g = g->next;
 753                 g->next = hwif->next;
 754                 if (hwgroup->hwif == hwif) {
 755                         /* Chose a random hwif for hwgroup->hwif.
 756                          * It's guaranteed that there are no drives
 757                          * left in the hwgroup.
 758                          */
 759                         BUG_ON(hwgroup->drive != NULL);
 760                         hwgroup->hwif = g;
 761                 }
 762                 BUG_ON(hwgroup->hwif == hwif);
 763         }
 764
 765         /* More messed up locking ... */
 766         spin_unlock_irq(&ide_lock);
 767         device_unregister(&hwif->gendev);
 768         down(&hwif->gendev_rel_sem);
 769
 770         /*
 771          * Remove us from the kernel's knowledge
 772          */
 773         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 774         for (i = 0; i < MAX_DRIVES; i++) {
 775                 struct gendisk *disk = hwif->drives[i].disk;
 776                 hwif->drives[i].disk = NULL;
 777                 put_disk(disk);
 778         }
 779         kfree(hwif->sg_table);
 780         unregister_blkdev(hwif->major, hwif->name);
 781         spin_lock_irq(&ide_lock);
 782
 783         if (hwif->dma_base) {
 784                 (void) ide_release_dma(hwif);
 785
 786                 hwif->dma_base = 0;
 787                 hwif->dma_master = 0;
 788                 hwif->dma_command = 0;
 789                 hwif->dma_vendor1 = 0;
 790                 hwif->dma_status = 0;
 791                 hwif->dma_vendor3 = 0;
 792                 hwif->dma_prdtable = 0;
 793         }
 794
 795         /* copy original settings */
 796         tmp_hwif = *hwif;
 797
 798         /* restore hwif data to pristine status */
 799         init_hwif_data(hwif, index);
 800         init_hwif_default(hwif, index);
 801
 802         ide_hwif_restore(hwif, &tmp_hwif);
 803
 804 abort:
 805         spin_unlock_irq(&ide_lock);
 806         up(&ide_cfg_sem);
 807 }
 808
 809 EXPORT_SYMBOL(ide_unregister);
 810
 811
 812 /**
 813  *      ide_setup_ports         -       set up IDE interface ports
 814  *      @hw: register descriptions
 815  *      @base: base register
 816  *      @offsets: table of register offsets
 817  *      @ctrl: control register
 818  *      @ack_irq: IRQ ack
 819  *      @irq: interrupt lie
 820  *
 821  *      Setup hw_regs_t structure described by parameters.  You
 822  *      may set up the hw structure yourself OR use this routine to
 823  *      do it for you. This is basically a helper
 824  *
 825  */
 826
 827 void ide_setup_ports (  hw_regs_t *hw,
 828                         unsigned long base, int *offsets,
 829                         unsigned long ctrl, unsigned long intr,
 830                         ide_ack_intr_t *ack_intr,
 831 /*
 832  *                      ide_io_ops_t *iops,
 833  */
 834                         int irq)
 835 {
 836         int i;
 837
 838         for (i = 0; i < IDE_NR_PORTS; i++) {
 839                 if (offsets[i] == -1) {
 840                         switch(i) {
 841                                 case IDE_CONTROL_OFFSET:
 842                                         hw->io_ports[i] = ctrl;
 843                                         break;
 844 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
 845                                 case IDE_IRQ_OFFSET:
 846                                         hw->io_ports[i] = intr;
 847                                         break;
 848 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
 849                                 default:
 850                                         hw->io_ports[i] = 0;
 851                                         break;
 852                         }
 853                 } else {
 854                         hw->io_ports[i] = base + offsets[i];
 855                 }
 856         }
 857         hw->irq = irq;
 858         hw->dma = NO_DMA;
 859         hw->ack_intr = ack_intr;
 860 /*
 861  *      hw->iops = iops;
 862  */
 863 }
 864
 865 /**
 866  *      ide_register_hw_with_fixup      -       register IDE interface
 867  *      @hw: hardware registers
 868  *      @hwifp: pointer to returned hwif
 869  *      @fixup: fixup function
 870  *
 871  *      Register an IDE interface, specifying exactly the registers etc.
 872  *      Set init=1 iff calling before probes have taken place.
 873  *
 874  *      Returns -1 on error.
 875  */
 876
 877 int ide_register_hw_with_fixup(hw_regs_t *hw, ide_hwif_t **hwifp, void(*fixup)(ide_hwif_t *hwif))
 878 {
 879         int index, retry = 1;
 880         ide_hwif_t *hwif;
 881
 882         do {
 883                 for (index = 0; index < MAX_HWIFS; ++index) {
 884                         hwif = &ide_hwifs[index];
 885                         if (hwif->hw.io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
 886                                 goto found;
 887                 }
 888                 for (index = 0; index < MAX_HWIFS; ++index) {
 889                         hwif = &ide_hwifs[index];
 890                         if (hwif->hold)
 891                                 continue;
 892                         if ((!hwif->present && !hwif->mate && !initializing) ||
 893                             (!hwif->hw.io_ports[IDE_DATA_OFFSET] && initializing))
 894                                 goto found;
 895                 }
 896                 for (index = 0; index < MAX_HWIFS; index++)
 897                         ide_unregister(index);
 898         } while (retry--);
 899         return -1;
 900 found:
 901         if (hwif->present)
 902                 ide_unregister(index);
 903         else if (!hwif->hold) {
 904                 init_hwif_data(hwif, index);
 905                 init_hwif_default(hwif, index);
 906         }
 907         if (hwif->present)
 908                 return -1;
 909         memcpy(&hwif->hw, hw, sizeof(*hw));
 910         memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
 911         hwif->irq = hw->irq;
 912         hwif->noprobe = 0;
 913         hwif->chipset = hw->chipset;
 914
 915         if (!initializing) {
 916                 probe_hwif_init_with_fixup(hwif, fixup);
 917                 create_proc_ide_interfaces();
 918         }
 919
 920         if (hwifp)
 921                 *hwifp = hwif;
 922
 923         return (initializing || hwif->present) ? index : -1;
 924 }
 925
 926 EXPORT_SYMBOL(ide_register_hw_with_fixup);
 927
 928 int ide_register_hw(hw_regs_t *hw, ide_hwif_t **hwifp)
 929 {
 930         return ide_register_hw_with_fixup(hw, hwifp, NULL);
 931 }
 932
 933 EXPORT_SYMBOL(ide_register_hw);
 934
 935 /*
 936  *      Locks for IDE setting functionality
 937  */
 938
 939 DECLARE_MUTEX(ide_setting_sem);
 940
 941 /**
 942  *      ide_add_setting -       add an ide setting option
 943  *      @drive: drive to use
 944  *      @name: setting name
 945  *      @rw: true if the function is read write
 946  *      @read_ioctl: function to call on read
 947  *      @write_ioctl: function to call on write
 948  *      @data_type: type of data
 949  *      @min: range minimum
 950  *      @max: range maximum
 951  *      @mul_factor: multiplication scale
 952  *      @div_factor: divison scale
 953  *      @data: private data field
 954  *      @set: setting
 955  *
 956  *      Removes the setting named from the device if it is present.
 957  *      The function takes the settings_lock to protect against
 958  *      parallel changes. This function must not be called from IRQ
 959  *      context. Returns 0 on success or -1 on failure.
 960  *
 961  *      BUGS: This code is seriously over-engineered. There is also
 962  *      magic about how the driver specific features are setup. If
 963  *      a driver is attached we assume the driver settings are auto
 964  *      remove.
 965  */
 966
 967 int ide_add_setting (ide_drive_t *drive, const char *name, int rw, int read_ioctl, int write_ioctl, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set)
 968 {
 969         ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL;
 970
 971         down(&ide_setting_sem);
 972         while ((*p) && strcmp((*p)->name, name) < 0)
 973                 p = &((*p)->next);
 974         if ((setting = kmalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
 975                 goto abort;
 976         memset(setting, 0, sizeof(*setting));
 977         if ((setting->name = kmalloc(strlen(name) + 1, GFP_KERNEL)) == NULL)
 978                 goto abort;
 979         strcpy(setting->name, name);
 980         setting->rw = rw;
 981         setting->read_ioctl = read_ioctl;
 982         setting->write_ioctl = write_ioctl;
 983         setting->data_type = data_type;
 984         setting->min = min;
 985         setting->max = max;
 986         setting->mul_factor = mul_factor;
 987         setting->div_factor = div_factor;
 988         setting->data = data;
 989         setting->set = set;
 990
 991         setting->next = *p;
 992         if (drive->driver != &idedefault_driver)
 993                 setting->auto_remove = 1;
 994         *p = setting;
 995         up(&ide_setting_sem);
 996         return 0;
 997 abort:
 998         up(&ide_setting_sem);
 999         if (setting)
1000                 kfree(setting);
1001         return -1;
1002 }
1003
1004 EXPORT_SYMBOL(ide_add_setting);
1005
1006 /**
1007  *      __ide_remove_setting    -       remove an ide setting option
1008  *      @drive: drive to use
1009  *      @name: setting name
1010  *
1011  *      Removes the setting named from the device if it is present.
1012  *      The caller must hold the setting semaphore.
1013  */
1014
1015 static void __ide_remove_setting (ide_drive_t *drive, char *name)
1016 {
1017         ide_settings_t **p, *setting;
1018
1019         p = (ide_settings_t **) &drive->settings;
1020
1021         while ((*p) && strcmp((*p)->name, name))
1022                 p = &((*p)->next);
1023         if ((setting = (*p)) == NULL)
1024                 return;
1025
1026         (*p) = setting->next;
1027
1028         kfree(setting->name);
1029         kfree(setting);
1030 }
1031
1032 /**
1033  *      ide_find_setting_by_ioctl       -       find a drive specific ioctl
1034  *      @drive: drive to scan
1035  *      @cmd: ioctl command to handle
1036  *
1037  *      Scan's the device setting table for a matching entry and returns
1038  *      this or NULL if no entry is found. The caller must hold the
1039  *      setting semaphore
1040  */
1041
1042 static ide_settings_t *ide_find_setting_by_ioctl (ide_drive_t *drive, int cmd)
1043 {
1044         ide_settings_t *setting = drive->settings;
1045
1046         while (setting) {
1047                 if (setting->read_ioctl == cmd || setting->write_ioctl == cmd)
1048                         break;
1049                 setting = setting->next;
1050         }
1051
1052         return setting;
1053 }
1054
1055 /**
1056  *      ide_find_setting_by_name        -       find a drive specific setting
1057  *      @drive: drive to scan
1058  *      @name: setting name
1059  *
1060  *      Scan's the device setting table for a matching entry and returns
1061  *      this or NULL if no entry is found. The caller must hold the
1062  *      setting semaphore
1063  */
1064
1065 ide_settings_t *ide_find_setting_by_name (ide_drive_t *drive, char *name)
1066 {
1067         ide_settings_t *setting = drive->settings;
1068
1069         while (setting) {
1070                 if (strcmp(setting->name, name) == 0)
1071                         break;
1072                 setting = setting->next;
1073         }
1074         return setting;
1075 }
1076
1077 /**
1078  *      auto_remove_settings    -       remove driver specific settings
1079  *      @drive: drive
1080  *
1081  *      Automatically remove all the driver specific settings for this
1082  *      drive. This function may sleep and must not be called from IRQ
1083  *      context. The caller must hold ide_setting_sem.
1084  */
1085
1086 static void auto_remove_settings (ide_drive_t *drive)
1087 {
1088         ide_settings_t *setting;
1089 repeat:
1090         setting = drive->settings;
1091         while (setting) {
1092                 if (setting->auto_remove) {
1093                         __ide_remove_setting(drive, setting->name);
1094                         goto repeat;
1095                 }
1096                 setting = setting->next;
1097         }
1098 }
1099
1100 /**
1101  *      ide_read_setting        -       read an IDE setting
1102  *      @drive: drive to read from
1103  *      @setting: drive setting
1104  *
1105  *      Read a drive setting and return the value. The caller
1106  *      must hold the ide_setting_sem when making this call.
1107  *
1108  *      BUGS: the data return and error are the same return value
1109  *      so an error -EINVAL and true return of the same value cannot
1110  *      be told apart
1111  */
1112
1113 int ide_read_setting (ide_drive_t *drive, ide_settings_t *setting)
1114 {
1115         int             val = -EINVAL;
1116         unsigned long   flags;
1117
1118         if ((setting->rw & SETTING_READ)) {
1119                 spin_lock_irqsave(&ide_lock, flags);
1120                 switch(setting->data_type) {
1121                         case TYPE_BYTE:
1122                                 val = *((u8 *) setting->data);
1123                                 break;
1124                         case TYPE_SHORT:
1125                                 val = *((u16 *) setting->data);
1126                                 break;
1127                         case TYPE_INT:
1128                         case TYPE_INTA:
1129                                 val = *((u32 *) setting->data);
1130                                 break;
1131                 }
1132                 spin_unlock_irqrestore(&ide_lock, flags);
1133         }
1134         return val;
1135 }
1136
1137 /**
1138  *      ide_spin_wait_hwgroup   -       wait for group
1139  *      @drive: drive in the group
1140  *
1141  *      Wait for an IDE device group to go non busy and then return
1142  *      holding the ide_lock which guards the hwgroup->busy status
1143  *      and right to use it.
1144  */
1145
1146 int ide_spin_wait_hwgroup (ide_drive_t *drive)
1147 {
1148         ide_hwgroup_t *hwgroup = HWGROUP(drive);
1149         unsigned long timeout = jiffies + (3 * HZ);
1150
1151         spin_lock_irq(&ide_lock);
1152
1153         while (hwgroup->busy) {
1154                 unsigned long lflags;
1155                 spin_unlock_irq(&ide_lock);
1156                 local_irq_set(lflags);
1157                 if (time_after(jiffies, timeout)) {
1158                         local_irq_restore(lflags);
1159                         printk(KERN_ERR "%s: channel busy\n", drive->name);
1160                         return -EBUSY;
1161                 }
1162                 local_irq_restore(lflags);
1163                 spin_lock_irq(&ide_lock);
1164         }
1165         return 0;
1166 }
1167
1168 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
1169
1170 /**
1171  *      ide_write_setting       -       read an IDE setting
1172  *      @drive: drive to read from
1173  *      @setting: drive setting
1174  *      @val: value
1175  *
1176  *      Write a drive setting if it is possible. The caller
1177  *      must hold the ide_setting_sem when making this call.
1178  *
1179  *      BUGS: the data return and error are the same return value
1180  *      so an error -EINVAL and true return of the same value cannot
1181  *      be told apart
1182  *
1183  *      FIXME:  This should be changed to enqueue a special request
1184  *      to the driver to change settings, and then wait on a sema for completion.
1185  *      The current scheme of polling is kludgy, though safe enough.
1186  */
1187
1188 int ide_write_setting (ide_drive_t *drive, ide_settings_t *setting, int val)
1189 {
1190         int i;
1191         u32 *p;
1192
1193         if (!capable(CAP_SYS_ADMIN))
1194                 return -EACCES;
1195         if (!(setting->rw & SETTING_WRITE))
1196                 return -EPERM;
1197         if (val < setting->min || val > setting->max)
1198                 return -EINVAL;
1199         if (setting->set)
1200                 return setting->set(drive, val);
1201         if (ide_spin_wait_hwgroup(drive))
1202                 return -EBUSY;
1203         switch (setting->data_type) {
1204                 case TYPE_BYTE:
1205                         *((u8 *) setting->data) = val;
1206                         break;
1207                 case TYPE_SHORT:
1208                         *((u16 *) setting->data) = val;
1209                         break;
1210                 case TYPE_INT:
1211                         *((u32 *) setting->data) = val;
1212                         break;
1213                 case TYPE_INTA:
1214                         p = (u32 *) setting->data;
1215                         for (i = 0; i < 1 << PARTN_BITS; i++, p++)
1216                                 *p = val;
1217                         break;
1218         }
1219         spin_unlock_irq(&ide_lock);
1220         return 0;
1221 }
1222
1223 static int set_io_32bit(ide_drive_t *drive, int arg)
1224 {
1225         drive->io_32bit = arg;
1226 #ifdef CONFIG_BLK_DEV_DTC2278
1227         if (HWIF(drive)->chipset == ide_dtc2278)
1228                 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
1229 #endif /* CONFIG_BLK_DEV_DTC2278 */
1230         return 0;
1231 }
1232
1233 static int set_using_dma (ide_drive_t *drive, int arg)
1234 {
1235 #ifdef CONFIG_BLK_DEV_IDEDMA
1236         if (!drive->id || !(drive->id->capability & 1))
1237                 return -EPERM;
1238         if (HWIF(drive)->ide_dma_check == NULL)
1239                 return -EPERM;
1240         if (arg) {
1241                 if (HWIF(drive)->ide_dma_check(drive)) return -EIO;
1242                 if (HWIF(drive)->ide_dma_on(drive)) return -EIO;
1243         } else {
1244                 if (__ide_dma_off(drive))
1245                         return -EIO;
1246         }
1247         return 0;
1248 #else
1249         return -EPERM;
1250 #endif
1251 }
1252
1253 static int set_pio_mode (ide_drive_t *drive, int arg)
1254 {
1255         struct request rq;
1256
1257         if (!HWIF(drive)->tuneproc)
1258                 return -ENOSYS;
1259         if (drive->special.b.set_tune)
1260                 return -EBUSY;
1261         ide_init_drive_cmd(&rq);
1262         drive->tune_req = (u8) arg;
1263         drive->special.b.set_tune = 1;
1264         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1265         return 0;
1266 }
1267
1268 static int set_xfer_rate (ide_drive_t *drive, int arg)
1269 {
1270         int err = ide_wait_cmd(drive,
1271                         WIN_SETFEATURES, (u8) arg,
1272                         SETFEATURES_XFER, 0, NULL);
1273
1274         if (!err && arg) {
1275                 ide_set_xfer_rate(drive, (u8) arg);
1276                 ide_driveid_update(drive);
1277         }
1278         return err;
1279 }
1280
1281 /**
1282  *      ide_add_generic_settings        -       generic ide settings
1283  *      @drive: drive being configured
1284  *
1285  *      Add the generic parts of the system settings to the /proc files and
1286  *      ioctls for this IDE device. The caller must not be holding the
1287  *      ide_setting_sem.
1288  */
1289
1290 void ide_add_generic_settings (ide_drive_t *drive)
1291 {
1292 /*
1293  *                      drive   setting name            read/write access                               read ioctl              write ioctl             data type       min     max                             mul_factor      div_factor      data pointer                    set function
1294  */
1295         ide_add_setting(drive,  "io_32bit",             drive->no_io_32bit ? SETTING_READ : SETTING_RW, HDIO_GET_32BIT,         HDIO_SET_32BIT,         TYPE_BYTE,      0,      1 + (SUPPORT_VLB_SYNC << 1),    1,              1,              &drive->io_32bit,               set_io_32bit);
1296         ide_add_setting(drive,  "keepsettings",         SETTING_RW,                                     HDIO_GET_KEEPSETTINGS,  HDIO_SET_KEEPSETTINGS,  TYPE_BYTE,      0,      1,                              1,              1,              &drive->keep_settings,          NULL);
1297         ide_add_setting(drive,  "nice1",                SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->nice1,                  NULL);
1298         ide_add_setting(drive,  "pio_mode",             SETTING_WRITE,                                  -1,                     HDIO_SET_PIO_MODE,      TYPE_BYTE,      0,      255,                            1,              1,              NULL,                           set_pio_mode);
1299         ide_add_setting(drive,  "unmaskirq",            drive->no_unmask ? SETTING_READ : SETTING_RW,   HDIO_GET_UNMASKINTR,    HDIO_SET_UNMASKINTR,    TYPE_BYTE,      0,      1,                              1,              1,              &drive->unmask,                 NULL);
1300         ide_add_setting(drive,  "using_dma",            SETTING_RW,                                     HDIO_GET_DMA,           HDIO_SET_DMA,           TYPE_BYTE,      0,      1,                              1,              1,              &drive->using_dma,              set_using_dma);
1301         ide_add_setting(drive,  "init_speed",           SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      70,                             1,              1,              &drive->init_speed,             NULL);
1302         ide_add_setting(drive,  "current_speed",        SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      70,                             1,              1,              &drive->current_speed,          set_xfer_rate);
1303         ide_add_setting(drive,  "number",               SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      3,                              1,              1,              &drive->dn,                     NULL);
1304 }
1305
1306 /**
1307  *      system_bus_clock        -       clock guess
1308  *
1309  *      External version of the bus clock guess used by very old IDE drivers
1310  *      for things like VLB timings. Should not be used.
1311  */
1312
1313 int system_bus_clock (void)
1314 {
1315         return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
1316 }
1317
1318 EXPORT_SYMBOL(system_bus_clock);
1319
1320 /*
1321  *      Locking is badly broken here - since way back.  That sucker is
1322  * root-only, but that's not an excuse...  The real question is what
1323  * exclusion rules do we want here.
1324  */
1325 int ide_replace_subdriver (ide_drive_t *drive, const char *driver)
1326 {
1327         if (!drive->present || drive->usage || drive->dead)
1328                 goto abort;
1329         if (DRIVER(drive)->cleanup(drive))
1330                 goto abort;
1331         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
1332         if (ata_attach(drive)) {
1333                 spin_lock(&drives_lock);
1334                 list_del_init(&drive->list);
1335                 spin_unlock(&drives_lock);
1336                 drive->driver_req[0] = 0;
1337                 ata_attach(drive);
1338         } else {
1339                 drive->driver_req[0] = 0;
1340         }
1341         if (DRIVER(drive)!= &idedefault_driver && !strcmp(DRIVER(drive)->name, driver))
1342                 return 0;
1343 abort:
1344         return 1;
1345 }
1346
1347 /**
1348  *      ata_attach              -       attach an ATA/ATAPI device
1349  *      @drive: drive to attach
1350  *
1351  *      Takes a drive that is as yet not assigned to any midlayer IDE
1352  *      driver (or is assigned to the default driver) and figures out
1353  *      which driver would like to own it. If nobody claims the drive
1354  *      then it is automatically attached to the default driver used for
1355  *      unclaimed objects.
1356  *
1357  *      A return of zero indicates attachment to a driver, of one
1358  *      attachment to the default driver.
1359  *
1360  *      Takes drivers_lock.
1361  */
1362
1363 int ata_attach(ide_drive_t *drive)
1364 {
1365         struct list_head *p;
1366         spin_lock(&drivers_lock);
1367         list_for_each(p, &drivers) {
1368                 ide_driver_t *driver = list_entry(p, ide_driver_t, drivers);
1369                 if (!try_module_get(driver->owner))
1370                         continue;
1371                 spin_unlock(&drivers_lock);
1372                 if (driver->attach(drive) == 0) {
1373                         module_put(driver->owner);
1374                         drive->gendev.driver = &driver->gen_driver;
1375                         return 0;
1376                 }
1377                 spin_lock(&drivers_lock);
1378                 module_put(driver->owner);
1379         }
1380         drive->gendev.driver = &idedefault_driver.gen_driver;
1381         spin_unlock(&drivers_lock);
1382         if(idedefault_driver.attach(drive) != 0)
1383                 panic("ide: default attach failed");
1384         return 1;
1385 }
1386
1387 static int generic_ide_suspend(struct device *dev, pm_message_t state)
1388 {
1389         ide_drive_t *drive = dev->driver_data;
1390         struct request rq;
1391         struct request_pm_state rqpm;
1392         ide_task_t args;
1393
1394         memset(&rq, 0, sizeof(rq));
1395         memset(&rqpm, 0, sizeof(rqpm));
1396         memset(&args, 0, sizeof(args));
1397         rq.flags = REQ_PM_SUSPEND;
1398         rq.special = &args;
1399         rq.pm = &rqpm;
1400         rqpm.pm_step = ide_pm_state_start_suspend;
1401         rqpm.pm_state = state;
1402
1403         return ide_do_drive_cmd(drive, &rq, ide_wait);
1404 }
1405
1406 static int generic_ide_resume(struct device *dev)
1407 {
1408         ide_drive_t *drive = dev->driver_data;
1409         struct request rq;
1410         struct request_pm_state rqpm;
1411         ide_task_t args;
1412
1413         memset(&rq, 0, sizeof(rq));
1414         memset(&rqpm, 0, sizeof(rqpm));
1415         memset(&args, 0, sizeof(args));
1416         rq.flags = REQ_PM_RESUME;
1417         rq.special = &args;
1418         rq.pm = &rqpm;
1419         rqpm.pm_step = ide_pm_state_start_resume;
1420         rqpm.pm_state = 0;
1421
1422         return ide_do_drive_cmd(drive, &rq, ide_head_wait);
1423 }
1424
1425 int generic_ide_ioctl(struct file *file, struct block_device *bdev,
1426                         unsigned int cmd, unsigned long arg)
1427 {
1428         ide_drive_t *drive = bdev->bd_disk->private_data;
1429         ide_settings_t *setting;
1430         int err = 0;
1431         void __user *p = (void __user *)arg;
1432
1433         down(&ide_setting_sem);
1434         if ((setting = ide_find_setting_by_ioctl(drive, cmd)) != NULL) {
1435                 if (cmd == setting->read_ioctl) {
1436                         err = ide_read_setting(drive, setting);
1437                         up(&ide_setting_sem);
1438                         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1439                 } else {
1440                         if (bdev != bdev->bd_contains)
1441                                 err = -EINVAL;
1442                         else
1443                                 err = ide_write_setting(drive, setting, arg);
1444                         up(&ide_setting_sem);
1445                         return err;
1446                 }
1447         }
1448         up(&ide_setting_sem);
1449
1450         switch (cmd) {
1451                 case HDIO_GETGEO:
1452                 {
1453                         struct hd_geometry geom;
1454                         if (!p || (drive->media != ide_disk && drive->media != ide_floppy)) return -EINVAL;
1455                         geom.heads = drive->bios_head;
1456                         geom.sectors = drive->bios_sect;
1457                         geom.cylinders = (u16)drive->bios_cyl; /* truncate */
1458                         geom.start = get_start_sect(bdev);
1459                         if (copy_to_user(p, &geom, sizeof(struct hd_geometry)))
1460                                 return -EFAULT;
1461                         return 0;
1462                 }
1463
1464                 case HDIO_OBSOLETE_IDENTITY:
1465                 case HDIO_GET_IDENTITY:
1466                         if (bdev != bdev->bd_contains)
1467                                 return -EINVAL;
1468                         if (drive->id_read == 0)
1469                                 return -ENOMSG;
1470                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1471                                 return -EFAULT;
1472                         return 0;
1473
1474                 case HDIO_GET_NICE:
1475                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1476                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1477                                         drive->nice0            <<      IDE_NICE_0              |
1478                                         drive->nice1            <<      IDE_NICE_1              |
1479                                         drive->nice2            <<      IDE_NICE_2,
1480                                         (long __user *) arg);
1481
1482 #ifdef CONFIG_IDE_TASK_IOCTL
1483                 case HDIO_DRIVE_TASKFILE:
1484                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1485                                 return -EACCES;
1486                         switch(drive->media) {
1487                                 case ide_disk:
1488                                         return ide_taskfile_ioctl(drive, cmd, arg);
1489                                 default:
1490                                         return -ENOMSG;
1491                         }
1492 #endif /* CONFIG_IDE_TASK_IOCTL */
1493
1494                 case HDIO_DRIVE_CMD:
1495                         if (!capable(CAP_SYS_RAWIO))
1496                                 return -EACCES;
1497                         return ide_cmd_ioctl(drive, cmd, arg);
1498
1499                 case HDIO_DRIVE_TASK:
1500                         if (!capable(CAP_SYS_RAWIO))
1501                                 return -EACCES;
1502                         return ide_task_ioctl(drive, cmd, arg);
1503
1504                 case HDIO_SCAN_HWIF:
1505                 {
1506                         hw_regs_t hw;
1507                         int args[3];
1508                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1509                         if (copy_from_user(args, p, 3 * sizeof(int)))
1510                                 return -EFAULT;
1511                         memset(&hw, 0, sizeof(hw));
1512                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1513                                             (unsigned long) args[1], NULL);
1514                         hw.irq = args[2];
1515                         if (ide_register_hw(&hw, NULL) == -1)
1516                                 return -EIO;
1517                         return 0;
1518                 }
1519                 case HDIO_UNREGISTER_HWIF:
1520                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1521                         /* (arg > MAX_HWIFS) checked in function */
1522                         ide_unregister(arg);
1523                         return 0;
1524                 case HDIO_SET_NICE:
1525                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1526                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1527                                 return -EPERM;
1528                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1529                         if (drive->dsc_overlap && !DRIVER(drive)->supports_dsc_overlap) {
1530                                 drive->dsc_overlap = 0;
1531                                 return -EPERM;
1532                         }
1533                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1534                         return 0;
1535                 case HDIO_DRIVE_RESET:
1536                 {
1537                         unsigned long flags;
1538                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1539
1540                         /*
1541                          *      Abort the current command on the
1542                          *      group if there is one, taking
1543                          *      care not to allow anything else
1544                          *      to be queued and to die on the
1545                          *      spot if we miss one somehow
1546                          */
1547
1548                         spin_lock_irqsave(&ide_lock, flags);
1549
1550                         ide_abort(drive, "drive reset");
1551
1552                         if(HWGROUP(drive)->handler)
1553                                 BUG();
1554
1555                         /* Ensure nothing gets queued after we
1556                            drop the lock. Reset will clear the busy */
1557
1558                         HWGROUP(drive)->busy = 1;
1559                         spin_unlock_irqrestore(&ide_lock, flags);
1560                         (void) ide_do_reset(drive);
1561
1562                         return 0;
1563                 }
1564
1565                 case CDROMEJECT:
1566                 case CDROMCLOSETRAY:
1567                         return scsi_cmd_ioctl(file, bdev->bd_disk, cmd, p);
1568
1569                 case HDIO_GET_BUSSTATE:
1570                         if (!capable(CAP_SYS_ADMIN))
1571                                 return -EACCES;
1572                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1573                                 return -EFAULT;
1574                         return 0;
1575
1576                 case HDIO_SET_BUSSTATE:
1577                         if (!capable(CAP_SYS_ADMIN))
1578                                 return -EACCES;
1579                         if (HWIF(drive)->busproc)
1580                                 return HWIF(drive)->busproc(drive, (int)arg);
1581                         return -EOPNOTSUPP;
1582                 default:
1583                         return -EINVAL;
1584         }
1585 }
1586
1587 EXPORT_SYMBOL(generic_ide_ioctl);
1588
1589 /*
1590  * stridx() returns the offset of c within s,
1591  * or -1 if c is '\0' or not found within s.
1592  */
1593 static int __init stridx (const char *s, char c)
1594 {
1595         char *i = strchr(s, c);
1596         return (i && c) ? i - s : -1;
1597 }
1598
1599 /*
1600  * match_parm() does parsing for ide_setup():
1601  *
1602  * 1. the first char of s must be '='.
1603  * 2. if the remainder matches one of the supplied keywords,
1604  *     the index (1 based) of the keyword is negated and returned.
1605  * 3. if the remainder is a series of no more than max_vals numbers
1606  *     separated by commas, the numbers are saved in vals[] and a
1607  *     count of how many were saved is returned.  Base10 is assumed,
1608  *     and base16 is allowed when prefixed with "0x".
1609  * 4. otherwise, zero is returned.
1610  */
1611 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1612 {
1613         static const char *decimal = "0123456789";
1614         static const char *hex = "0123456789abcdef";
1615         int i, n;
1616
1617         if (*s++ == '=') {
1618                 /*
1619                  * Try matching against the supplied keywords,
1620                  * and return -(index+1) if we match one
1621                  */
1622                 if (keywords != NULL) {
1623                         for (i = 0; *keywords != NULL; ++i) {
1624                                 if (!strcmp(s, *keywords++))
1625                                         return -(i+1);
1626                         }
1627                 }
1628                 /*
1629                  * Look for a series of no more than "max_vals"
1630                  * numeric values separated by commas, in base10,
1631                  * or base16 when prefixed with "0x".
1632                  * Return a count of how many were found.
1633                  */
1634                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1635                         vals[n] = i;
1636                         while ((i = stridx(decimal, *++s)) >= 0)
1637                                 vals[n] = (vals[n] * 10) + i;
1638                         if (*s == 'x' && !vals[n]) {
1639                                 while ((i = stridx(hex, *++s)) >= 0)
1640                                         vals[n] = (vals[n] * 0x10) + i;
1641                         }
1642                         if (++n == max_vals)
1643                                 break;
1644                         if (*s == ',' || *s == ';')
1645                                 ++s;
1646                 }
1647                 if (!*s)
1648                         return n;
1649         }
1650         return 0;       /* zero = nothing matched */
1651 }
1652
1653 #ifdef CONFIG_BLK_DEV_ALI14XX
1654 static int __initdata probe_ali14xx;
1655 extern int ali14xx_init(void);
1656 #endif
1657 #ifdef CONFIG_BLK_DEV_UMC8672
1658 static int __initdata probe_umc8672;
1659 extern int umc8672_init(void);
1660 #endif
1661 #ifdef CONFIG_BLK_DEV_DTC2278
1662 static int __initdata probe_dtc2278;
1663 extern int dtc2278_init(void);
1664 #endif
1665 #ifdef CONFIG_BLK_DEV_HT6560B
1666 static int __initdata probe_ht6560b;
1667 extern int ht6560b_init(void);
1668 #endif
1669 #ifdef CONFIG_BLK_DEV_QD65XX
1670 static int __initdata probe_qd65xx;
1671 extern int qd65xx_init(void);
1672 #endif
1673
1674 static int __initdata is_chipset_set[MAX_HWIFS];
1675
1676 /*
1677  * ide_setup() gets called VERY EARLY during initialization,
1678  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1679  *
1680  * Remember to update Documentation/ide.txt if you change something here.
1681  */
1682 static int __init ide_setup(char *s)
1683 {
1684         int i, vals[3];
1685         ide_hwif_t *hwif;
1686         ide_drive_t *drive;
1687         unsigned int hw, unit;
1688         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1689         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1690
1691
1692         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1693                 return 0;                               /* driver and not us */
1694
1695         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1696                 return 0;
1697
1698         printk(KERN_INFO "ide_setup: %s", s);
1699         init_ide_data ();
1700
1701 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1702         if (!strcmp(s, "ide=doubler")) {
1703                 extern int ide_doubler;
1704
1705                 printk(" : Enabled support for IDE doublers\n");
1706                 ide_doubler = 1;
1707                 return 1;
1708         }
1709 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1710
1711         if (!strcmp(s, "ide=nodma")) {
1712                 printk(" : Prevented DMA\n");
1713                 noautodma = 1;
1714                 return 1;
1715         }
1716
1717 #ifdef CONFIG_BLK_DEV_IDEPCI
1718         if (!strcmp(s, "ide=reverse")) {
1719                 ide_scan_direction = 1;
1720                 printk(" : Enabled support for IDE inverse scan order.\n");
1721                 return 1;
1722         }
1723 #endif /* CONFIG_BLK_DEV_IDEPCI */
1724
1725         /*
1726          * Look for drive options:  "hdx="
1727          */
1728         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1729                 const char *hd_words[] = {
1730                         "none", "noprobe", "nowerr", "cdrom", "serialize",
1731                         "autotune", "noautotune", "minus8", "swapdata", "bswap",
1732                         "minus11", "remap", "remap63", "scsi", NULL };
1733                 unit = s[2] - 'a';
1734                 hw   = unit / MAX_DRIVES;
1735                 unit = unit % MAX_DRIVES;
1736                 hwif = &ide_hwifs[hw];
1737                 drive = &hwif->drives[unit];
1738                 if (strncmp(s + 4, "ide-", 4) == 0) {
1739                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1740                         goto done;
1741                 }
1742                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1743                         case -1: /* "none" */
1744                         case -2: /* "noprobe" */
1745                                 drive->noprobe = 1;
1746                                 goto done;
1747                         case -3: /* "nowerr" */
1748                                 drive->bad_wstat = BAD_R_STAT;
1749                                 hwif->noprobe = 0;
1750                                 goto done;
1751                         case -4: /* "cdrom" */
1752                                 drive->present = 1;
1753                                 drive->media = ide_cdrom;
1754                                 hwif->noprobe = 0;
1755                                 goto done;
1756                         case -5: /* "serialize" */
1757                                 printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
1758                                 goto do_serialize;
1759                         case -6: /* "autotune" */
1760                                 drive->autotune = IDE_TUNE_AUTO;
1761                                 goto obsolete_option;
1762                         case -7: /* "noautotune" */
1763                                 drive->autotune = IDE_TUNE_NOAUTO;
1764                                 goto obsolete_option;
1765                         case -9: /* "swapdata" */
1766                         case -10: /* "bswap" */
1767                                 drive->bswap = 1;
1768                                 goto done;
1769                         case -12: /* "remap" */
1770                                 drive->remap_0_to_1 = 1;
1771                                 goto done;
1772                         case -13: /* "remap63" */
1773                                 drive->sect0 = 63;
1774                                 goto done;
1775                         case -14: /* "scsi" */
1776                                 drive->scsi = 1;
1777                                 goto done;
1778                         case 3: /* cyl,head,sect */
1779                                 drive->media    = ide_disk;
1780                                 drive->cyl      = drive->bios_cyl  = vals[0];
1781                                 drive->head     = drive->bios_head = vals[1];
1782                                 drive->sect     = drive->bios_sect = vals[2];
1783                                 drive->present  = 1;
1784                                 drive->forced_geom = 1;
1785                                 hwif->noprobe = 0;
1786                                 goto done;
1787                         default:
1788                                 goto bad_option;
1789                 }
1790         }
1791
1792         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1793                 goto bad_option;
1794         /*
1795          * Look for bus speed option:  "idebus="
1796          */
1797         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1798                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1799                         goto bad_option;
1800                 if (vals[0] >= 20 && vals[0] <= 66) {
1801                         idebus_parameter = vals[0];
1802                 } else
1803                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1804                 goto done;
1805         }
1806         /*
1807          * Look for interface options:  "idex="
1808          */
1809         if (s[3] >= '0' && s[3] <= max_hwif) {
1810                 /*
1811                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1812                  * (-8, -9, -10) are reserved to ease the hardcoding.
1813                  */
1814                 static const char *ide_words[] = {
1815                         "noprobe", "serialize", "autotune", "noautotune",
1816                         "reset", "dma", "ata66", "minus8", "minus9",
1817                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1818                         "dtc2278", "umc8672", "ali14xx", NULL };
1819                 hw = s[3] - '0';
1820                 hwif = &ide_hwifs[hw];
1821                 i = match_parm(&s[4], ide_words, vals, 3);
1822
1823                 /*
1824                  * Cryptic check to ensure chipset not already set for hwif.
1825                  * Note: we can't depend on hwif->chipset here.
1826                  */
1827                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1828                         /* chipset already specified */
1829                         if (is_chipset_set[hw])
1830                                 goto bad_option;
1831                         if (i > -18 && i <= -11) {
1832                                 /* these drivers are for "ide0=" only */
1833                                 if (hw != 0)
1834                                         goto bad_hwif;
1835                                 /* chipset already specified for 2nd port */
1836                                 if (is_chipset_set[hw+1])
1837                                         goto bad_option;
1838                         }
1839                         is_chipset_set[hw] = 1;
1840                         printk("\n");
1841                 }
1842
1843                 switch (i) {
1844 #ifdef CONFIG_BLK_DEV_ALI14XX
1845                         case -17: /* "ali14xx" */
1846                                 probe_ali14xx = 1;
1847                                 goto done;
1848 #endif
1849 #ifdef CONFIG_BLK_DEV_UMC8672
1850                         case -16: /* "umc8672" */
1851                                 probe_umc8672 = 1;
1852                                 goto done;
1853 #endif
1854 #ifdef CONFIG_BLK_DEV_DTC2278
1855                         case -15: /* "dtc2278" */
1856                                 probe_dtc2278 = 1;
1857                                 goto done;
1858 #endif
1859 #ifdef CONFIG_BLK_DEV_CMD640
1860                         case -14: /* "cmd640_vlb" */
1861                         {
1862                                 extern int cmd640_vlb; /* flag for cmd640.c */
1863                                 cmd640_vlb = 1;
1864                                 goto done;
1865                         }
1866 #endif
1867 #ifdef CONFIG_BLK_DEV_HT6560B
1868                         case -13: /* "ht6560b" */
1869                                 probe_ht6560b = 1;
1870                                 goto done;
1871 #endif
1872 #ifdef CONFIG_BLK_DEV_QD65XX
1873                         case -12: /* "qd65xx" */
1874                                 probe_qd65xx = 1;
1875                                 goto done;
1876 #endif
1877 #ifdef CONFIG_BLK_DEV_4DRIVES
1878                         case -11: /* "four" drives on one set of ports */
1879                         {
1880                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1881                                 mate->drives[0].select.all ^= 0x20;
1882                                 mate->drives[1].select.all ^= 0x20;
1883                                 hwif->chipset = mate->chipset = ide_4drives;
1884                                 mate->irq = hwif->irq;
1885                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1886                                 goto do_serialize;
1887                         }
1888 #endif /* CONFIG_BLK_DEV_4DRIVES */
1889                         case -10: /* minus10 */
1890                         case -9: /* minus9 */
1891                         case -8: /* minus8 */
1892                                 goto bad_option;
1893                         case -7: /* ata66 */
1894 #ifdef CONFIG_BLK_DEV_IDEPCI
1895                                 hwif->udma_four = 1;
1896                                 goto obsolete_option;
1897 #else
1898                                 goto bad_hwif;
1899 #endif
1900                         case -6: /* dma */
1901                                 hwif->autodma = 1;
1902                                 goto obsolete_option;
1903                         case -5: /* "reset" */
1904                                 hwif->reset = 1;
1905                                 goto obsolete_option;
1906                         case -4: /* "noautotune" */
1907                                 hwif->drives[0].autotune = IDE_TUNE_NOAUTO;
1908                                 hwif->drives[1].autotune = IDE_TUNE_NOAUTO;
1909                                 goto obsolete_option;
1910                         case -3: /* "autotune" */
1911                                 hwif->drives[0].autotune = IDE_TUNE_AUTO;
1912                                 hwif->drives[1].autotune = IDE_TUNE_AUTO;
1913                                 goto obsolete_option;
1914                         case -2: /* "serialize" */
1915                         do_serialize:
1916                                 hwif->mate = &ide_hwifs[hw^1];
1917                                 hwif->mate->mate = hwif;
1918                                 hwif->serialized = hwif->mate->serialized = 1;
1919                                 goto obsolete_option;
1920
1921                         case -1: /* "noprobe" */
1922                                 hwif->noprobe = 1;
1923                                 goto done;
1924
1925                         case 1: /* base */
1926                                 vals[1] = vals[0] + 0x206; /* default ctl */
1927                         case 2: /* base,ctl */
1928                                 vals[2] = 0;    /* default irq = probe for it */
1929                         case 3: /* base,ctl,irq */
1930                                 hwif->hw.irq = vals[2];
1931                                 ide_init_hwif_ports(&hwif->hw, (unsigned long) vals[0], (unsigned long) vals[1], &hwif->irq);
1932                                 memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
1933                                 hwif->irq      = vals[2];
1934                                 hwif->noprobe  = 0;
1935                                 hwif->chipset  = ide_forced;
1936                                 goto obsolete_option;
1937
1938                         case 0: goto bad_option;
1939                         default:
1940                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1941                                 return 1;
1942                 }
1943         }
1944 bad_option:
1945         printk(" -- BAD OPTION\n");
1946         return 1;
1947 obsolete_option:
1948         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1949         return 1;
1950 bad_hwif:
1951         printk("-- NOT SUPPORTED ON ide%d", hw);
1952 done:
1953         printk("\n");
1954         return 1;
1955 }
1956
1957 extern void pnpide_init(void);
1958 extern void h8300_ide_init(void);
1959
1960 /*
1961  * probe_for_hwifs() finds/initializes "known" IDE interfaces
1962  */
1963 static void __init probe_for_hwifs (void)
1964 {
1965 #ifdef CONFIG_BLK_DEV_IDEPCI
1966         ide_scan_pcibus(ide_scan_direction);
1967 #endif /* CONFIG_BLK_DEV_IDEPCI */
1968
1969 #ifdef CONFIG_ETRAX_IDE
1970         {
1971                 extern void init_e100_ide(void);
1972                 init_e100_ide();
1973         }
1974 #endif /* CONFIG_ETRAX_IDE */
1975 #ifdef CONFIG_BLK_DEV_CMD640
1976         {
1977                 extern void ide_probe_for_cmd640x(void);
1978                 ide_probe_for_cmd640x();
1979         }
1980 #endif /* CONFIG_BLK_DEV_CMD640 */
1981 #ifdef CONFIG_BLK_DEV_IDE_PMAC
1982         {
1983                 extern void pmac_ide_probe(void);
1984                 pmac_ide_probe();
1985         }
1986 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
1987 #ifdef CONFIG_BLK_DEV_GAYLE
1988         {
1989                 extern void gayle_init(void);
1990                 gayle_init();
1991         }
1992 #endif /* CONFIG_BLK_DEV_GAYLE */
1993 #ifdef CONFIG_BLK_DEV_FALCON_IDE
1994         {
1995                 extern void falconide_init(void);
1996                 falconide_init();
1997         }
1998 #endif /* CONFIG_BLK_DEV_FALCON_IDE */
1999 #ifdef CONFIG_BLK_DEV_MAC_IDE
2000         {
2001                 extern void macide_init(void);
2002                 macide_init();
2003         }
2004 #endif /* CONFIG_BLK_DEV_MAC_IDE */
2005 #ifdef CONFIG_BLK_DEV_Q40IDE
2006         {
2007                 extern void q40ide_init(void);
2008                 q40ide_init();
2009         }
2010 #endif /* CONFIG_BLK_DEV_Q40IDE */
2011 #ifdef CONFIG_BLK_DEV_BUDDHA
2012         {
2013                 extern void buddha_init(void);
2014                 buddha_init();
2015         }
2016 #endif /* CONFIG_BLK_DEV_BUDDHA */
2017 #ifdef CONFIG_BLK_DEV_IDEPNP
2018         pnpide_init();
2019 #endif
2020 #ifdef CONFIG_H8300
2021         h8300_ide_init();
2022 #endif
2023 }
2024
2025 static ide_startstop_t default_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
2026 {
2027         ide_end_request(drive, 0, 0);
2028         return ide_stopped;
2029 }
2030
2031 static int default_end_request (ide_drive_t *drive, int uptodate, int nr_sects)
2032 {
2033         return ide_end_request(drive, uptodate, nr_sects);
2034 }
2035
2036 static ide_startstop_t
2037 default_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
2038 {
2039         return __ide_error(drive, rq, stat, err);
2040 }
2041
2042 static void default_pre_reset (ide_drive_t *drive)
2043 {
2044 }
2045
2046 static sector_t default_capacity (ide_drive_t *drive)
2047 {
2048         return 0x7fffffff;
2049 }
2050
2051 static ide_startstop_t default_special (ide_drive_t *drive)
2052 {
2053         special_t *s = &drive->special;
2054
2055         s->all = 0;
2056         drive->mult_req = 0;
2057         return ide_stopped;
2058 }
2059
2060 static ide_startstop_t default_abort(ide_drive_t *drive, struct request *rq)
2061 {
2062         return __ide_abort(drive, rq);
2063 }
2064
2065 static ide_startstop_t default_start_power_step(ide_drive_t *drive,
2066                                                 struct request *rq)
2067 {
2068         rq->pm->pm_step = ide_pm_state_completed;
2069         return ide_stopped;
2070 }
2071
2072 static void setup_driver_defaults (ide_driver_t *d)
2073 {
2074         BUG_ON(d->attach == NULL || d->cleanup == NULL);
2075
2076         if (d->do_request == NULL)      d->do_request = default_do_request;
2077         if (d->end_request == NULL)     d->end_request = default_end_request;
2078         if (d->error == NULL)           d->error = default_error;
2079         if (d->abort == NULL)           d->abort = default_abort;
2080         if (d->pre_reset == NULL)       d->pre_reset = default_pre_reset;
2081         if (d->capacity == NULL)        d->capacity = default_capacity;
2082         if (d->special == NULL)         d->special = default_special;
2083         if (d->start_power_step == NULL)
2084                 d->start_power_step = default_start_power_step;
2085 }
2086
2087 int ide_register_subdriver(ide_drive_t *drive, ide_driver_t *driver)
2088 {
2089         unsigned long flags;
2090
2091         BUG_ON(!drive->driver);
2092
2093         spin_lock_irqsave(&ide_lock, flags);
2094         if (!drive->present || drive->driver != &idedefault_driver ||
2095             drive->usage || drive->dead) {
2096                 spin_unlock_irqrestore(&ide_lock, flags);
2097                 return 1;
2098         }
2099         drive->driver = driver;
2100         spin_unlock_irqrestore(&ide_lock, flags);
2101         spin_lock(&drives_lock);
2102         list_add_tail(&drive->list, &driver->drives);
2103         spin_unlock(&drives_lock);
2104 //      printk(KERN_INFO "%s: attached %s driver.\n", drive->name, driver->name);
2105         if ((drive->autotune == IDE_TUNE_DEFAULT) ||
2106                 (drive->autotune == IDE_TUNE_AUTO)) {
2107                 /* DMA timings and setup moved to ide-probe.c */
2108                 drive->dsc_overlap = (drive->next != drive && driver->supports_dsc_overlap);
2109                 drive->nice1 = 1;
2110         }
2111 #ifdef CONFIG_PROC_FS
2112         if (drive->driver != &idedefault_driver) {
2113                 ide_add_proc_entries(drive->proc, generic_subdriver_entries, drive);
2114                 ide_add_proc_entries(drive->proc, driver->proc, drive);
2115         }
2116 #endif
2117         return 0;
2118 }
2119
2120 EXPORT_SYMBOL(ide_register_subdriver);
2121
2122 /**
2123  *      ide_unregister_subdriver        -       disconnect drive from driver
2124  *      @drive: drive to unplug
2125  *
2126  *      Disconnect a drive from the driver it was attached to and then
2127  *      clean up the various proc files and other objects attached to it.
2128  *
2129  *      Takes ide_setting_sem, ide_lock and drives_lock.
2130  *      Caller must hold none of the locks.
2131  *
2132  *      No locking versus subdriver unload because we are moving to the
2133  *      default driver anyway. Wants double checking.
2134  */
2135
2136 int ide_unregister_subdriver (ide_drive_t *drive)
2137 {
2138         unsigned long flags;
2139
2140         down(&ide_setting_sem);
2141         spin_lock_irqsave(&ide_lock, flags);
2142         if (drive->usage || drive->driver == &idedefault_driver || DRIVER(drive)->busy) {
2143                 spin_unlock_irqrestore(&ide_lock, flags);
2144                 up(&ide_setting_sem);
2145                 return 1;
2146         }
2147 #ifdef CONFIG_PROC_FS
2148         ide_remove_proc_entries(drive->proc, DRIVER(drive)->proc);
2149         ide_remove_proc_entries(drive->proc, generic_subdriver_entries);
2150 #endif
2151         auto_remove_settings(drive);
2152         drive->driver = &idedefault_driver;
2153         spin_unlock_irqrestore(&ide_lock, flags);
2154         up(&ide_setting_sem);
2155         spin_lock(&drives_lock);
2156         list_del_init(&drive->list);
2157         spin_unlock(&drives_lock);
2158         /* drive will be added to &idedefault_driver->drives in ata_attach() */
2159         return 0;
2160 }
2161
2162 EXPORT_SYMBOL(ide_unregister_subdriver);
2163
2164 static int ide_drive_remove(struct device * dev)
2165 {
2166         ide_drive_t * drive = container_of(dev,ide_drive_t,gendev);
2167         DRIVER(drive)->cleanup(drive);
2168         return 0;
2169 }
2170
2171 /**
2172  *      ide_register_driver     -       register IDE device driver
2173  *      @driver: the IDE device driver
2174  *
2175  *      Register a new device driver and then scan the devices
2176  *      on the IDE bus in case any should be attached to the
2177  *      driver we have just registered.  If so attach them.
2178  *
2179  *      Takes drivers_lock and drives_lock.
2180  */
2181
2182 int ide_register_driver(ide_driver_t *driver)
2183 {
2184         struct list_head list;
2185         struct list_head *list_loop;
2186         struct list_head *tmp_storage;
2187
2188         setup_driver_defaults(driver);
2189
2190         spin_lock(&drivers_lock);
2191         list_add(&driver->drivers, &drivers);
2192         spin_unlock(&drivers_lock);
2193
2194         INIT_LIST_HEAD(&list);
2195         spin_lock(&drives_lock);
2196         list_splice_init(&idedefault_driver.drives, &list);
2197         spin_unlock(&drives_lock);
2198
2199         list_for_each_safe(list_loop, tmp_storage, &list) {
2200                 ide_drive_t *drive = container_of(list_loop, ide_drive_t, list);
2201                 list_del_init(&drive->list);
2202                 if (drive->present)
2203                         ata_attach(drive);
2204         }
2205         driver->gen_driver.name = (char *) driver->name;
2206         driver->gen_driver.bus = &ide_bus_type;
2207         driver->gen_driver.remove = ide_drive_remove;
2208         return driver_register(&driver->gen_driver);
2209 }
2210
2211 EXPORT_SYMBOL(ide_register_driver);
2212
2213 /**
2214  *      ide_unregister_driver   -       unregister IDE device driver
2215  *      @driver: the IDE device driver
2216  *
2217  *      Called when a driver module is being unloaded. We reattach any
2218  *      devices to whatever driver claims them next (typically the default
2219  *      driver).
2220  *
2221  *      Takes drivers_lock and called functions will take ide_setting_sem.
2222  */
2223
2224 void ide_unregister_driver(ide_driver_t *driver)
2225 {
2226         ide_drive_t *drive;
2227
2228         spin_lock(&drivers_lock);
2229         list_del(&driver->drivers);
2230         spin_unlock(&drivers_lock);
2231
2232         driver_unregister(&driver->gen_driver);
2233
2234         while(!list_empty(&driver->drives)) {
2235                 drive = list_entry(driver->drives.next, ide_drive_t, list);
2236                 if (driver->cleanup(drive)) {
2237                         printk(KERN_ERR "%s: cleanup_module() called while still busy\n", drive->name);
2238                         BUG();
2239                 }
2240                 ata_attach(drive);
2241         }
2242 }
2243
2244 EXPORT_SYMBOL(ide_unregister_driver);
2245
2246 struct block_device_operations ide_fops[] = {{
2247         .owner          = THIS_MODULE,
2248         .open           = ide_open,
2249 }};
2250
2251 EXPORT_SYMBOL(ide_fops);
2252
2253 /*
2254  * Probe module
2255  */
2256
2257 EXPORT_SYMBOL(ide_lock);
2258
2259 struct bus_type ide_bus_type = {
2260         .name           = "ide",
2261         .suspend        = generic_ide_suspend,
2262         .resume         = generic_ide_resume,
2263 };
2264
2265 /*
2266  * This is gets invoked once during initialization, to set *everything* up
2267  */
2268 static int __init ide_init(void)
2269 {
2270         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
2271         devfs_mk_dir("ide");
2272         system_bus_speed = ide_system_bus_speed();
2273
2274         bus_register(&ide_bus_type);
2275
2276         init_ide_data();
2277
2278 #ifdef CONFIG_PROC_FS
2279         proc_ide_root = proc_mkdir("ide", NULL);
2280 #endif
2281
2282 #ifdef CONFIG_BLK_DEV_ALI14XX
2283         if (probe_ali14xx)
2284                 (void)ali14xx_init();
2285 #endif
2286 #ifdef CONFIG_BLK_DEV_UMC8672
2287         if (probe_umc8672)
2288                 (void)umc8672_init();
2289 #endif
2290 #ifdef CONFIG_BLK_DEV_DTC2278
2291         if (probe_dtc2278)
2292                 (void)dtc2278_init();
2293 #endif
2294 #ifdef CONFIG_BLK_DEV_HT6560B
2295         if (probe_ht6560b)
2296                 (void)ht6560b_init();
2297 #endif
2298 #ifdef CONFIG_BLK_DEV_QD65XX
2299         if (probe_qd65xx)
2300                 (void)qd65xx_init();
2301 #endif
2302
2303         initializing = 1;
2304         /* Probe for special PCI and other "known" interface chipsets. */
2305         probe_for_hwifs();
2306         initializing = 0;
2307
2308 #ifdef CONFIG_PROC_FS
2309         proc_ide_create();
2310 #endif
2311         return 0;
2312 }
2313
2314 #ifdef MODULE
2315 static char *options = NULL;
2316 module_param(options, charp, 0);
2317 MODULE_LICENSE("GPL");
2318
2319 static void __init parse_options (char *line)
2320 {
2321         char *next = line;
2322
2323         if (line == NULL || !*line)
2324                 return;
2325         while ((line = next) != NULL) {
2326                 if ((next = strchr(line,' ')) != NULL)
2327                         *next++ = 0;
2328                 if (!ide_setup(line))
2329                         printk (KERN_INFO "Unknown option '%s'\n", line);
2330         }
2331 }
2332
2333 int init_module (void)
2334 {
2335         parse_options(options);
2336         return ide_init();
2337 }
2338
2339 void cleanup_module (void)
2340 {
2341         int index;
2342
2343         for (index = 0; index < MAX_HWIFS; ++index)
2344                 ide_unregister(index);
2345
2346 #ifdef CONFIG_PROC_FS
2347         proc_ide_destroy();
2348 #endif
2349         devfs_remove("ide");
2350
2351         bus_unregister(&ide_bus_type);
2352 }
2353
2354 #else /* !MODULE */
2355
2356 __setup("", ide_setup);
2357
2358 module_init(ide_init);
2359
2360 #endif /* MODULE */