d42216b52a7b0b5c11be3bef333618bcfeb341ee
[linux-2.6.git] / drivers / ide / ide.c
1 /*
2  *  Copyright (C) 1994-1998         Linus Torvalds & authors (see below)
3  *  Copyrifht (C) 2003-2005, 2007   Bartlomiej Zolnierkiewicz
4  */
5
6 /*
7  *  Mostly written by Mark Lord  <mlord@pobox.com>
8  *                and Gadi Oxman <gadio@netvision.net.il>
9  *                and Andre Hedrick <andre@linux-ide.org>
10  *
11  *  See linux/MAINTAINERS for address of current maintainer.
12  *
13  * This is the multiple IDE interface driver, as evolved from hd.c.
14  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
15  *   (usually 14 & 15).
16  * There can be up to two drives per interface, as per the ATA-2 spec.
17  *
18  * ...
19  *
20  *  From hd.c:
21  *  |
22  *  | It traverses the request-list, using interrupts to jump between functions.
23  *  | As nearly all functions can be called within interrupts, we may not sleep.
24  *  | Special care is recommended.  Have Fun!
25  *  |
26  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
27  *  |
28  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
29  *  | in the early extended-partition checks and added DM partitions.
30  *  |
31  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
32  *  |
33  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
34  *  | and general streamlining by Mark Lord (mlord@pobox.com).
35  *
36  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
37  *
38  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
39  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
40  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
41  *
42  *  This was a rewrite of just about everything from hd.c, though some original
43  *  code is still sprinkled about.  Think of it as a major evolution, with
44  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
45  */
46
47 #define REVISION        "Revision: 7.00alpha2"
48
49 #define _IDE_C                  /* Tell ide.h it's really us */
50
51 #include <linux/module.h>
52 #include <linux/types.h>
53 #include <linux/string.h>
54 #include <linux/kernel.h>
55 #include <linux/timer.h>
56 #include <linux/mm.h>
57 #include <linux/interrupt.h>
58 #include <linux/major.h>
59 #include <linux/errno.h>
60 #include <linux/genhd.h>
61 #include <linux/blkpg.h>
62 #include <linux/slab.h>
63 #include <linux/init.h>
64 #include <linux/pci.h>
65 #include <linux/delay.h>
66 #include <linux/ide.h>
67 #include <linux/completion.h>
68 #include <linux/reboot.h>
69 #include <linux/cdrom.h>
70 #include <linux/seq_file.h>
71 #include <linux/device.h>
72 #include <linux/bitops.h>
73
74 #include <asm/byteorder.h>
75 #include <asm/irq.h>
76 #include <asm/uaccess.h>
77 #include <asm/io.h>
78
79
80 /* default maximum number of failures */
81 #define IDE_DEFAULT_MAX_FAILURES        1
82
83 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
84                                         IDE2_MAJOR, IDE3_MAJOR,
85                                         IDE4_MAJOR, IDE5_MAJOR,
86                                         IDE6_MAJOR, IDE7_MAJOR,
87                                         IDE8_MAJOR, IDE9_MAJOR };
88
89 static int idebus_parameter;    /* holds the "idebus=" parameter */
90 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
91
92 DEFINE_MUTEX(ide_cfg_mtx);
93  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
94
95 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
96 int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
97 #endif
98
99 int noautodma = 0;
100
101 #ifdef CONFIG_BLK_DEV_IDEACPI
102 int ide_noacpi = 0;
103 int ide_noacpitfs = 1;
104 int ide_noacpionboot = 1;
105 #endif
106
107 /*
108  * This is declared extern in ide.h, for access by other IDE modules:
109  */
110 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
111
112 EXPORT_SYMBOL(ide_hwifs);
113
114 /*
115  * Do not even *think* about calling this!
116  */
117 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
118 {
119         unsigned int unit;
120
121         /* bulk initialize hwif & drive info with zeros */
122         memset(hwif, 0, sizeof(ide_hwif_t));
123
124         /* fill in any non-zero initial values */
125         hwif->index     = index;
126         hwif->major     = ide_hwif_to_major[index];
127
128         hwif->name[0]   = 'i';
129         hwif->name[1]   = 'd';
130         hwif->name[2]   = 'e';
131         hwif->name[3]   = '0' + index;
132
133         hwif->bus_state = BUSSTATE_ON;
134
135         init_completion(&hwif->gendev_rel_comp);
136
137         default_hwif_iops(hwif);
138         default_hwif_transport(hwif);
139         for (unit = 0; unit < MAX_DRIVES; ++unit) {
140                 ide_drive_t *drive = &hwif->drives[unit];
141
142                 drive->media                    = ide_disk;
143                 drive->select.all               = (unit<<4)|0xa0;
144                 drive->hwif                     = hwif;
145                 drive->ctl                      = 0x08;
146                 drive->ready_stat               = READY_STAT;
147                 drive->bad_wstat                = BAD_W_STAT;
148                 drive->special.b.recalibrate    = 1;
149                 drive->special.b.set_geometry   = 1;
150                 drive->name[0]                  = 'h';
151                 drive->name[1]                  = 'd';
152                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
153                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
154                 drive->using_dma                = 0;
155                 drive->vdma                     = 0;
156                 INIT_LIST_HEAD(&drive->list);
157                 init_completion(&drive->gendev_rel_comp);
158         }
159 }
160 EXPORT_SYMBOL_GPL(ide_init_port_data);
161
162 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
163 {
164         hw_regs_t hw;
165
166         memset(&hw, 0, sizeof(hw_regs_t));
167
168         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
169
170         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
171
172         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
173 #ifdef CONFIG_BLK_DEV_HD
174         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
175                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
176 #endif
177 }
178
179 /*
180  * init_ide_data() sets reasonable default values into all fields
181  * of all instances of the hwifs and drives, but only on the first call.
182  * Subsequent calls have no effect (they don't wipe out anything).
183  *
184  * This routine is normally called at driver initialization time,
185  * but may also be called MUCH earlier during kernel "command-line"
186  * parameter processing.  As such, we cannot depend on any other parts
187  * of the kernel (such as memory allocation) to be functioning yet.
188  *
189  * This is too bad, as otherwise we could dynamically allocate the
190  * ide_drive_t structs as needed, rather than always consuming memory
191  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
192  *
193  * FIXME: We should stuff the setup data into __init and copy the
194  * relevant hwifs/allocate them properly during boot.
195  */
196 #define MAGIC_COOKIE 0x12345678
197 static void __init init_ide_data (void)
198 {
199         ide_hwif_t *hwif;
200         unsigned int index;
201         static unsigned long magic_cookie = MAGIC_COOKIE;
202
203         if (magic_cookie != MAGIC_COOKIE)
204                 return;         /* already initialized */
205         magic_cookie = 0;
206
207         /* Initialise all interface structures */
208         for (index = 0; index < MAX_HWIFS; ++index) {
209                 hwif = &ide_hwifs[index];
210                 ide_init_port_data(hwif, index);
211                 init_hwif_default(hwif, index);
212 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
213                 hwif->irq =
214                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
215 #endif
216         }
217 }
218
219 /**
220  *      ide_system_bus_speed    -       guess bus speed
221  *
222  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
223  *      bus speed (in MHz). This is used for calculating interface PIO timings.
224  *      The default is 40 for known PCI systems, 50 otherwise.
225  *      The "idebus=xx" parameter can be used to override this value.
226  *      The actual value to be used is computed/displayed the first time
227  *      through. Drivers should only use this as a last resort.
228  *
229  *      Returns a guessed speed in MHz.
230  */
231
232 static int ide_system_bus_speed(void)
233 {
234 #ifdef CONFIG_PCI
235         static struct pci_device_id pci_default[] = {
236                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
237                 { }
238         };
239 #else
240 #define pci_default 0
241 #endif /* CONFIG_PCI */
242
243         /* user supplied value */
244         if (idebus_parameter)
245                 return idebus_parameter;
246
247         /* safe default value for PCI or VESA and PCI*/
248         return pci_dev_present(pci_default) ? 33 : 50;
249 }
250
251 ide_hwif_t * ide_find_port(unsigned long base)
252 {
253         ide_hwif_t *hwif;
254         int i;
255
256         for (i = 0; i < MAX_HWIFS; i++) {
257                 hwif = &ide_hwifs[i];
258                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
259                         goto found;
260         }
261
262         for (i = 0; i < MAX_HWIFS; i++) {
263                 hwif = &ide_hwifs[i];
264                 if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
265                         goto found;
266         }
267
268         hwif = NULL;
269 found:
270         return hwif;
271 }
272
273 EXPORT_SYMBOL_GPL(ide_find_port);
274
275 static struct resource* hwif_request_region(ide_hwif_t *hwif,
276                                             unsigned long addr, int num)
277 {
278         struct resource *res = request_region(addr, num, hwif->name);
279
280         if (!res)
281                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
282                                 hwif->name, addr, addr+num-1);
283         return res;
284 }
285
286 /**
287  *      ide_hwif_request_regions - request resources for IDE
288  *      @hwif: interface to use
289  *
290  *      Requests all the needed resources for an interface.
291  *      Right now core IDE code does this work which is deeply wrong.
292  *      MMIO leaves it to the controller driver,
293  *      PIO will migrate this way over time.
294  */
295
296 int ide_hwif_request_regions(ide_hwif_t *hwif)
297 {
298         unsigned long addr;
299         unsigned int i;
300
301         if (hwif->mmio)
302                 return 0;
303         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
304         if (addr && !hwif_request_region(hwif, addr, 1))
305                 goto control_region_busy;
306         hwif->straight8 = 0;
307         addr = hwif->io_ports[IDE_DATA_OFFSET];
308         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
309                 if (!hwif_request_region(hwif, addr, 8))
310                         goto data_region_busy;
311                 hwif->straight8 = 1;
312                 return 0;
313         }
314         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
315                 addr = hwif->io_ports[i];
316                 if (!hwif_request_region(hwif, addr, 1)) {
317                         while (--i)
318                                 release_region(addr, 1);
319                         goto data_region_busy;
320                 }
321         }
322         return 0;
323
324 data_region_busy:
325         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
326         if (addr)
327                 release_region(addr, 1);
328 control_region_busy:
329         /* If any errors are return, we drop the hwif interface. */
330         return -EBUSY;
331 }
332
333 /**
334  *      ide_hwif_release_regions - free IDE resources
335  *
336  *      Note that we only release the standard ports,
337  *      and do not even try to handle any extra ports
338  *      allocated for weird IDE interface chipsets.
339  *
340  *      Note also that we don't yet handle mmio resources here. More
341  *      importantly our caller should be doing this so we need to 
342  *      restructure this as a helper function for drivers.
343  */
344
345 void ide_hwif_release_regions(ide_hwif_t *hwif)
346 {
347         u32 i = 0;
348
349         if (hwif->mmio)
350                 return;
351         if (hwif->io_ports[IDE_CONTROL_OFFSET])
352                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
353         if (hwif->straight8) {
354                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
355                 return;
356         }
357         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
358                 if (hwif->io_ports[i])
359                         release_region(hwif->io_ports[i], 1);
360 }
361
362 /**
363  *      ide_hwif_restore        -       restore hwif to template
364  *      @hwif: hwif to update
365  *      @tmp_hwif: template
366  *
367  *      Restore hwif to a previous state by copying most settings
368  *      from the template.
369  */
370
371 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
372 {
373         hwif->hwgroup                   = tmp_hwif->hwgroup;
374
375         hwif->gendev.parent             = tmp_hwif->gendev.parent;
376
377         hwif->proc                      = tmp_hwif->proc;
378
379         hwif->major                     = tmp_hwif->major;
380         hwif->straight8                 = tmp_hwif->straight8;
381         hwif->bus_state                 = tmp_hwif->bus_state;
382
383         hwif->host_flags                = tmp_hwif->host_flags;
384
385         hwif->pio_mask                  = tmp_hwif->pio_mask;
386
387         hwif->ultra_mask                = tmp_hwif->ultra_mask;
388         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
389         hwif->swdma_mask                = tmp_hwif->swdma_mask;
390
391         hwif->cbl                       = tmp_hwif->cbl;
392
393         hwif->chipset                   = tmp_hwif->chipset;
394         hwif->hold                      = tmp_hwif->hold;
395
396         hwif->dev                       = tmp_hwif->dev;
397
398 #ifdef CONFIG_BLK_DEV_IDEPCI
399         hwif->cds                       = tmp_hwif->cds;
400 #endif
401
402         hwif->set_pio_mode              = tmp_hwif->set_pio_mode;
403         hwif->set_dma_mode              = tmp_hwif->set_dma_mode;
404         hwif->mdma_filter               = tmp_hwif->mdma_filter;
405         hwif->udma_filter               = tmp_hwif->udma_filter;
406         hwif->selectproc                = tmp_hwif->selectproc;
407         hwif->reset_poll                = tmp_hwif->reset_poll;
408         hwif->pre_reset                 = tmp_hwif->pre_reset;
409         hwif->resetproc                 = tmp_hwif->resetproc;
410         hwif->maskproc                  = tmp_hwif->maskproc;
411         hwif->quirkproc                 = tmp_hwif->quirkproc;
412         hwif->busproc                   = tmp_hwif->busproc;
413
414         hwif->ata_input_data            = tmp_hwif->ata_input_data;
415         hwif->ata_output_data           = tmp_hwif->ata_output_data;
416         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
417         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
418
419         hwif->dma_host_set              = tmp_hwif->dma_host_set;
420         hwif->dma_setup                 = tmp_hwif->dma_setup;
421         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
422         hwif->dma_start                 = tmp_hwif->dma_start;
423         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
424         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
425         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
426         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
427         hwif->dma_timeout               = tmp_hwif->dma_timeout;
428
429         hwif->OUTB                      = tmp_hwif->OUTB;
430         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
431         hwif->OUTW                      = tmp_hwif->OUTW;
432         hwif->OUTSW                     = tmp_hwif->OUTSW;
433         hwif->OUTSL                     = tmp_hwif->OUTSL;
434
435         hwif->INB                       = tmp_hwif->INB;
436         hwif->INW                       = tmp_hwif->INW;
437         hwif->INSW                      = tmp_hwif->INSW;
438         hwif->INSL                      = tmp_hwif->INSL;
439
440         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
441
442         hwif->mmio                      = tmp_hwif->mmio;
443         hwif->rqsize                    = tmp_hwif->rqsize;
444
445 #ifndef CONFIG_BLK_DEV_IDECS
446         hwif->irq                       = tmp_hwif->irq;
447 #endif
448
449         hwif->dma_base                  = tmp_hwif->dma_base;
450         hwif->dma_command               = tmp_hwif->dma_command;
451         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
452         hwif->dma_status                = tmp_hwif->dma_status;
453         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
454         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
455
456         hwif->config_data               = tmp_hwif->config_data;
457         hwif->select_data               = tmp_hwif->select_data;
458         hwif->extra_base                = tmp_hwif->extra_base;
459         hwif->extra_ports               = tmp_hwif->extra_ports;
460
461         hwif->hwif_data                 = tmp_hwif->hwif_data;
462 }
463
464 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
465 {
466         ide_hwgroup_t *hwgroup = hwif->hwgroup;
467
468         spin_lock_irq(&ide_lock);
469         /*
470          * Remove us from the hwgroup, and free
471          * the hwgroup if we were the only member
472          */
473         if (hwif->next == hwif) {
474                 BUG_ON(hwgroup->hwif != hwif);
475                 kfree(hwgroup);
476         } else {
477                 /* There is another interface in hwgroup.
478                  * Unlink us, and set hwgroup->drive and ->hwif to
479                  * something sane.
480                  */
481                 ide_hwif_t *g = hwgroup->hwif;
482
483                 while (g->next != hwif)
484                         g = g->next;
485                 g->next = hwif->next;
486                 if (hwgroup->hwif == hwif) {
487                         /* Chose a random hwif for hwgroup->hwif.
488                          * It's guaranteed that there are no drives
489                          * left in the hwgroup.
490                          */
491                         BUG_ON(hwgroup->drive != NULL);
492                         hwgroup->hwif = g;
493                 }
494                 BUG_ON(hwgroup->hwif == hwif);
495         }
496         spin_unlock_irq(&ide_lock);
497 }
498
499 /**
500  *      ide_unregister          -       free an IDE interface
501  *      @index: index of interface (will change soon to a pointer)
502  *      @init_default: init default hwif flag
503  *      @restore: restore hwif flag
504  *
505  *      Perform the final unregister of an IDE interface. At the moment
506  *      we don't refcount interfaces so this will also get split up.
507  *
508  *      Locking:
509  *      The caller must not hold the IDE locks
510  *      The drive present/vanishing is not yet properly locked
511  *      Take care with the callbacks. These have been split to avoid
512  *      deadlocking the IDE layer. The shutdown callback is called
513  *      before we take the lock and free resources. It is up to the
514  *      caller to be sure there is no pending I/O here, and that
515  *      the interface will not be reopened (present/vanishing locking
516  *      isn't yet done BTW). After we commit to the final kill we
517  *      call the cleanup callback with the ide locks held.
518  *
519  *      Unregister restores the hwif structures to the default state.
520  *      This is raving bonkers.
521  */
522
523 void ide_unregister(unsigned int index, int init_default, int restore)
524 {
525         ide_drive_t *drive;
526         ide_hwif_t *hwif, *g;
527         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
528         ide_hwgroup_t *hwgroup;
529         int irq_count = 0, unit;
530
531         BUG_ON(index >= MAX_HWIFS);
532
533         BUG_ON(in_interrupt());
534         BUG_ON(irqs_disabled());
535         mutex_lock(&ide_cfg_mtx);
536         spin_lock_irq(&ide_lock);
537         hwif = &ide_hwifs[index];
538         if (!hwif->present)
539                 goto abort;
540         for (unit = 0; unit < MAX_DRIVES; ++unit) {
541                 drive = &hwif->drives[unit];
542                 if (!drive->present)
543                         continue;
544                 spin_unlock_irq(&ide_lock);
545                 device_unregister(&drive->gendev);
546                 wait_for_completion(&drive->gendev_rel_comp);
547                 spin_lock_irq(&ide_lock);
548         }
549         hwif->present = 0;
550
551         spin_unlock_irq(&ide_lock);
552
553         ide_proc_unregister_port(hwif);
554
555         hwgroup = hwif->hwgroup;
556         /*
557          * free the irq if we were the only hwif using it
558          */
559         g = hwgroup->hwif;
560         do {
561                 if (g->irq == hwif->irq)
562                         ++irq_count;
563                 g = g->next;
564         } while (g != hwgroup->hwif);
565         if (irq_count == 1)
566                 free_irq(hwif->irq, hwgroup);
567
568         ide_remove_port_from_hwgroup(hwif);
569
570         device_unregister(&hwif->gendev);
571         wait_for_completion(&hwif->gendev_rel_comp);
572
573         /*
574          * Remove us from the kernel's knowledge
575          */
576         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
577         kfree(hwif->sg_table);
578         unregister_blkdev(hwif->major, hwif->name);
579         spin_lock_irq(&ide_lock);
580
581         if (hwif->dma_base) {
582                 (void) ide_release_dma(hwif);
583
584                 hwif->dma_base = 0;
585                 hwif->dma_command = 0;
586                 hwif->dma_vendor1 = 0;
587                 hwif->dma_status = 0;
588                 hwif->dma_vendor3 = 0;
589                 hwif->dma_prdtable = 0;
590
591                 hwif->extra_base  = 0;
592                 hwif->extra_ports = 0;
593         }
594
595         /*
596          * Note that we only release the standard ports,
597          * and do not even try to handle any extra ports
598          * allocated for weird IDE interface chipsets.
599          */
600         ide_hwif_release_regions(hwif);
601
602         /* copy original settings */
603         tmp_hwif = *hwif;
604
605         /* restore hwif data to pristine status */
606         ide_init_port_data(hwif, index);
607
608         if (init_default)
609                 init_hwif_default(hwif, index);
610
611         if (restore)
612                 ide_hwif_restore(hwif, &tmp_hwif);
613
614 abort:
615         spin_unlock_irq(&ide_lock);
616         mutex_unlock(&ide_cfg_mtx);
617 }
618
619 EXPORT_SYMBOL(ide_unregister);
620
621
622 /**
623  *      ide_setup_ports         -       set up IDE interface ports
624  *      @hw: register descriptions
625  *      @base: base register
626  *      @offsets: table of register offsets
627  *      @ctrl: control register
628  *      @ack_irq: IRQ ack
629  *      @irq: interrupt lie
630  *
631  *      Setup hw_regs_t structure described by parameters.  You
632  *      may set up the hw structure yourself OR use this routine to
633  *      do it for you. This is basically a helper
634  *
635  */
636  
637 void ide_setup_ports (  hw_regs_t *hw,
638                         unsigned long base, int *offsets,
639                         unsigned long ctrl, unsigned long intr,
640                         ide_ack_intr_t *ack_intr,
641 /*
642  *                      ide_io_ops_t *iops,
643  */
644                         int irq)
645 {
646         int i;
647
648         memset(hw, 0, sizeof(hw_regs_t));
649         for (i = 0; i < IDE_NR_PORTS; i++) {
650                 if (offsets[i] == -1) {
651                         switch(i) {
652                                 case IDE_CONTROL_OFFSET:
653                                         hw->io_ports[i] = ctrl;
654                                         break;
655 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
656                                 case IDE_IRQ_OFFSET:
657                                         hw->io_ports[i] = intr;
658                                         break;
659 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
660                                 default:
661                                         hw->io_ports[i] = 0;
662                                         break;
663                         }
664                 } else {
665                         hw->io_ports[i] = base + offsets[i];
666                 }
667         }
668         hw->irq = irq;
669         hw->ack_intr = ack_intr;
670 /*
671  *      hw->iops = iops;
672  */
673 }
674
675 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
676 {
677         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
678         hwif->irq = hw->irq;
679         hwif->noprobe = 0;
680         hwif->chipset = hw->chipset;
681         hwif->gendev.parent = hw->dev;
682         hwif->ack_intr = hw->ack_intr;
683 }
684 EXPORT_SYMBOL_GPL(ide_init_port_hw);
685
686 ide_hwif_t *ide_deprecated_find_port(unsigned long base)
687 {
688         ide_hwif_t *hwif;
689         int i;
690
691         for (i = 0; i < MAX_HWIFS; i++) {
692                 hwif = &ide_hwifs[i];
693                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
694                         goto found;
695         }
696
697         for (i = 0; i < MAX_HWIFS; i++) {
698                 hwif = &ide_hwifs[i];
699                 if (hwif->hold)
700                         continue;
701                 if (!hwif->present && hwif->mate == NULL)
702                         goto found;
703         }
704
705         hwif = NULL;
706 found:
707         return hwif;
708 }
709 EXPORT_SYMBOL_GPL(ide_deprecated_find_port);
710
711 /**
712  *      ide_register_hw         -       register IDE interface
713  *      @hw: hardware registers
714  *      @quirkproc: quirkproc function
715  *      @hwifp: pointer to returned hwif
716  *
717  *      Register an IDE interface, specifying exactly the registers etc.
718  *
719  *      Returns -1 on error.
720  */
721
722 int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
723                     ide_hwif_t **hwifp)
724 {
725         int index, retry = 1;
726         ide_hwif_t *hwif;
727         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
728
729         do {
730                 hwif = ide_deprecated_find_port(hw->io_ports[IDE_DATA_OFFSET]);
731                 index = hwif->index;
732                 if (hwif)
733                         goto found;
734                 for (index = 0; index < MAX_HWIFS; index++)
735                         ide_unregister(index, 1, 1);
736         } while (retry--);
737         return -1;
738 found:
739         if (hwif->present)
740                 ide_unregister(index, 0, 1);
741         else if (!hwif->hold)
742                 ide_init_port_data(hwif, index);
743
744         ide_init_port_hw(hwif, hw);
745         hwif->quirkproc = quirkproc;
746
747         idx[0] = index;
748
749         ide_device_add(idx, NULL);
750
751         if (hwifp)
752                 *hwifp = hwif;
753
754         return hwif->present ? index : -1;
755 }
756
757 EXPORT_SYMBOL(ide_register_hw);
758
759 /*
760  *      Locks for IDE setting functionality
761  */
762
763 DEFINE_MUTEX(ide_setting_mtx);
764
765 EXPORT_SYMBOL_GPL(ide_setting_mtx);
766
767 /**
768  *      ide_spin_wait_hwgroup   -       wait for group
769  *      @drive: drive in the group
770  *
771  *      Wait for an IDE device group to go non busy and then return
772  *      holding the ide_lock which guards the hwgroup->busy status
773  *      and right to use it.
774  */
775
776 int ide_spin_wait_hwgroup (ide_drive_t *drive)
777 {
778         ide_hwgroup_t *hwgroup = HWGROUP(drive);
779         unsigned long timeout = jiffies + (3 * HZ);
780
781         spin_lock_irq(&ide_lock);
782
783         while (hwgroup->busy) {
784                 unsigned long lflags;
785                 spin_unlock_irq(&ide_lock);
786                 local_irq_set(lflags);
787                 if (time_after(jiffies, timeout)) {
788                         local_irq_restore(lflags);
789                         printk(KERN_ERR "%s: channel busy\n", drive->name);
790                         return -EBUSY;
791                 }
792                 local_irq_restore(lflags);
793                 spin_lock_irq(&ide_lock);
794         }
795         return 0;
796 }
797
798 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
799
800 int set_io_32bit(ide_drive_t *drive, int arg)
801 {
802         if (drive->no_io_32bit)
803                 return -EPERM;
804
805         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
806                 return -EINVAL;
807
808         if (ide_spin_wait_hwgroup(drive))
809                 return -EBUSY;
810
811         drive->io_32bit = arg;
812
813         spin_unlock_irq(&ide_lock);
814
815         return 0;
816 }
817
818 static int set_ksettings(ide_drive_t *drive, int arg)
819 {
820         if (arg < 0 || arg > 1)
821                 return -EINVAL;
822
823         if (ide_spin_wait_hwgroup(drive))
824                 return -EBUSY;
825         drive->keep_settings = arg;
826         spin_unlock_irq(&ide_lock);
827
828         return 0;
829 }
830
831 int set_using_dma(ide_drive_t *drive, int arg)
832 {
833 #ifdef CONFIG_BLK_DEV_IDEDMA
834         ide_hwif_t *hwif = drive->hwif;
835         int err = -EPERM;
836
837         if (arg < 0 || arg > 1)
838                 return -EINVAL;
839
840         if (!drive->id || !(drive->id->capability & 1))
841                 goto out;
842
843         if (hwif->dma_host_set == NULL)
844                 goto out;
845
846         err = -EBUSY;
847         if (ide_spin_wait_hwgroup(drive))
848                 goto out;
849         /*
850          * set ->busy flag, unlock and let it ride
851          */
852         hwif->hwgroup->busy = 1;
853         spin_unlock_irq(&ide_lock);
854
855         err = 0;
856
857         if (arg) {
858                 if (ide_set_dma(drive))
859                         err = -EIO;
860         } else
861                 ide_dma_off(drive);
862
863         /*
864          * lock, clear ->busy flag and unlock before leaving
865          */
866         spin_lock_irq(&ide_lock);
867         hwif->hwgroup->busy = 0;
868         spin_unlock_irq(&ide_lock);
869 out:
870         return err;
871 #else
872         if (arg < 0 || arg > 1)
873                 return -EINVAL;
874
875         return -EPERM;
876 #endif
877 }
878
879 int set_pio_mode(ide_drive_t *drive, int arg)
880 {
881         struct request rq;
882
883         if (arg < 0 || arg > 255)
884                 return -EINVAL;
885
886         if (drive->hwif->set_pio_mode == NULL)
887                 return -ENOSYS;
888
889         if (drive->special.b.set_tune)
890                 return -EBUSY;
891
892         ide_init_drive_cmd(&rq);
893         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
894
895         drive->tune_req = (u8) arg;
896         drive->special.b.set_tune = 1;
897         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
898         return 0;
899 }
900
901 static int set_unmaskirq(ide_drive_t *drive, int arg)
902 {
903         if (drive->no_unmask)
904                 return -EPERM;
905
906         if (arg < 0 || arg > 1)
907                 return -EINVAL;
908
909         if (ide_spin_wait_hwgroup(drive))
910                 return -EBUSY;
911         drive->unmask = arg;
912         spin_unlock_irq(&ide_lock);
913
914         return 0;
915 }
916
917 /**
918  *      system_bus_clock        -       clock guess
919  *
920  *      External version of the bus clock guess used by very old IDE drivers
921  *      for things like VLB timings. Should not be used.
922  */
923
924 int system_bus_clock (void)
925 {
926         return system_bus_speed;
927 }
928
929 EXPORT_SYMBOL(system_bus_clock);
930
931 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
932 {
933         ide_drive_t *drive = dev->driver_data;
934         ide_hwif_t *hwif = HWIF(drive);
935         struct request rq;
936         struct request_pm_state rqpm;
937         ide_task_t args;
938         int ret;
939
940         /* Call ACPI _GTM only once */
941         if (!(drive->dn % 2))
942                 ide_acpi_get_timing(hwif);
943
944         memset(&rq, 0, sizeof(rq));
945         memset(&rqpm, 0, sizeof(rqpm));
946         memset(&args, 0, sizeof(args));
947         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
948         rq.special = &args;
949         rq.data = &rqpm;
950         rqpm.pm_step = ide_pm_state_start_suspend;
951         if (mesg.event == PM_EVENT_PRETHAW)
952                 mesg.event = PM_EVENT_FREEZE;
953         rqpm.pm_state = mesg.event;
954
955         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
956         /* only call ACPI _PS3 after both drivers are suspended */
957         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
958                  && hwif->drives[1].present)
959                  || !hwif->drives[0].present
960                  || !hwif->drives[1].present))
961                 ide_acpi_set_state(hwif, 0);
962         return ret;
963 }
964
965 static int generic_ide_resume(struct device *dev)
966 {
967         ide_drive_t *drive = dev->driver_data;
968         ide_hwif_t *hwif = HWIF(drive);
969         struct request rq;
970         struct request_pm_state rqpm;
971         ide_task_t args;
972         int err;
973
974         /* Call ACPI _STM only once */
975         if (!(drive->dn % 2)) {
976                 ide_acpi_set_state(hwif, 1);
977                 ide_acpi_push_timing(hwif);
978         }
979
980         ide_acpi_exec_tfs(drive);
981
982         memset(&rq, 0, sizeof(rq));
983         memset(&rqpm, 0, sizeof(rqpm));
984         memset(&args, 0, sizeof(args));
985         rq.cmd_type = REQ_TYPE_PM_RESUME;
986         rq.special = &args;
987         rq.data = &rqpm;
988         rqpm.pm_step = ide_pm_state_start_resume;
989         rqpm.pm_state = PM_EVENT_ON;
990
991         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
992
993         if (err == 0 && dev->driver) {
994                 ide_driver_t *drv = to_ide_driver(dev->driver);
995
996                 if (drv->resume)
997                         drv->resume(drive);
998         }
999
1000         return err;
1001 }
1002
1003 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
1004                         unsigned int cmd, unsigned long arg)
1005 {
1006         unsigned long flags;
1007         ide_driver_t *drv;
1008         void __user *p = (void __user *)arg;
1009         int err = 0, (*setfunc)(ide_drive_t *, int);
1010         u8 *val;
1011
1012         switch (cmd) {
1013         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
1014         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
1015         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
1016         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
1017         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
1018         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
1019         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
1020         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
1021         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
1022         }
1023
1024         switch (cmd) {
1025                 case HDIO_OBSOLETE_IDENTITY:
1026                 case HDIO_GET_IDENTITY:
1027                         if (bdev != bdev->bd_contains)
1028                                 return -EINVAL;
1029                         if (drive->id_read == 0)
1030                                 return -ENOMSG;
1031                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1032                                 return -EFAULT;
1033                         return 0;
1034
1035                 case HDIO_GET_NICE:
1036                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1037                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1038                                         drive->nice0            <<      IDE_NICE_0              |
1039                                         drive->nice1            <<      IDE_NICE_1              |
1040                                         drive->nice2            <<      IDE_NICE_2,
1041                                         (long __user *) arg);
1042
1043 #ifdef CONFIG_IDE_TASK_IOCTL
1044                 case HDIO_DRIVE_TASKFILE:
1045                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1046                                 return -EACCES;
1047                         switch(drive->media) {
1048                                 case ide_disk:
1049                                         return ide_taskfile_ioctl(drive, cmd, arg);
1050                                 default:
1051                                         return -ENOMSG;
1052                         }
1053 #endif /* CONFIG_IDE_TASK_IOCTL */
1054
1055                 case HDIO_DRIVE_CMD:
1056                         if (!capable(CAP_SYS_RAWIO))
1057                                 return -EACCES;
1058                         return ide_cmd_ioctl(drive, cmd, arg);
1059
1060                 case HDIO_DRIVE_TASK:
1061                         if (!capable(CAP_SYS_RAWIO))
1062                                 return -EACCES;
1063                         return ide_task_ioctl(drive, cmd, arg);
1064
1065                 case HDIO_SCAN_HWIF:
1066                 {
1067                         hw_regs_t hw;
1068                         int args[3];
1069                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1070                         if (copy_from_user(args, p, 3 * sizeof(int)))
1071                                 return -EFAULT;
1072                         memset(&hw, 0, sizeof(hw));
1073                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1074                                             (unsigned long) args[1], NULL);
1075                         hw.irq = args[2];
1076                         if (ide_register_hw(&hw, NULL, NULL) == -1)
1077                                 return -EIO;
1078                         return 0;
1079                 }
1080                 case HDIO_UNREGISTER_HWIF:
1081                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1082                         /* (arg > MAX_HWIFS) checked in function */
1083                         ide_unregister(arg, 1, 1);
1084                         return 0;
1085                 case HDIO_SET_NICE:
1086                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1087                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1088                                 return -EPERM;
1089                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1090                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1091                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1092                                 drive->dsc_overlap = 0;
1093                                 return -EPERM;
1094                         }
1095                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1096                         return 0;
1097                 case HDIO_DRIVE_RESET:
1098                 {
1099                         unsigned long flags;
1100                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1101                         
1102                         /*
1103                          *      Abort the current command on the
1104                          *      group if there is one, taking
1105                          *      care not to allow anything else
1106                          *      to be queued and to die on the
1107                          *      spot if we miss one somehow
1108                          */
1109
1110                         spin_lock_irqsave(&ide_lock, flags);
1111
1112                         if (HWGROUP(drive)->resetting) {
1113                                 spin_unlock_irqrestore(&ide_lock, flags);
1114                                 return -EBUSY;
1115                         }
1116
1117                         ide_abort(drive, "drive reset");
1118
1119                         BUG_ON(HWGROUP(drive)->handler);
1120                                 
1121                         /* Ensure nothing gets queued after we
1122                            drop the lock. Reset will clear the busy */
1123                    
1124                         HWGROUP(drive)->busy = 1;
1125                         spin_unlock_irqrestore(&ide_lock, flags);
1126                         (void) ide_do_reset(drive);
1127
1128                         return 0;
1129                 }
1130
1131                 case HDIO_GET_BUSSTATE:
1132                         if (!capable(CAP_SYS_ADMIN))
1133                                 return -EACCES;
1134                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1135                                 return -EFAULT;
1136                         return 0;
1137
1138                 case HDIO_SET_BUSSTATE:
1139                         if (!capable(CAP_SYS_ADMIN))
1140                                 return -EACCES;
1141                         if (HWIF(drive)->busproc)
1142                                 return HWIF(drive)->busproc(drive, (int)arg);
1143                         return -EOPNOTSUPP;
1144                 default:
1145                         return -EINVAL;
1146         }
1147
1148 read_val:
1149         mutex_lock(&ide_setting_mtx);
1150         spin_lock_irqsave(&ide_lock, flags);
1151         err = *val;
1152         spin_unlock_irqrestore(&ide_lock, flags);
1153         mutex_unlock(&ide_setting_mtx);
1154         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1155
1156 set_val:
1157         if (bdev != bdev->bd_contains)
1158                 err = -EINVAL;
1159         else {
1160                 if (!capable(CAP_SYS_ADMIN))
1161                         err = -EACCES;
1162                 else {
1163                         mutex_lock(&ide_setting_mtx);
1164                         err = setfunc(drive, arg);
1165                         mutex_unlock(&ide_setting_mtx);
1166                 }
1167         }
1168         return err;
1169 }
1170
1171 EXPORT_SYMBOL(generic_ide_ioctl);
1172
1173 /*
1174  * stridx() returns the offset of c within s,
1175  * or -1 if c is '\0' or not found within s.
1176  */
1177 static int __init stridx (const char *s, char c)
1178 {
1179         char *i = strchr(s, c);
1180         return (i && c) ? i - s : -1;
1181 }
1182
1183 /*
1184  * match_parm() does parsing for ide_setup():
1185  *
1186  * 1. the first char of s must be '='.
1187  * 2. if the remainder matches one of the supplied keywords,
1188  *     the index (1 based) of the keyword is negated and returned.
1189  * 3. if the remainder is a series of no more than max_vals numbers
1190  *     separated by commas, the numbers are saved in vals[] and a
1191  *     count of how many were saved is returned.  Base10 is assumed,
1192  *     and base16 is allowed when prefixed with "0x".
1193  * 4. otherwise, zero is returned.
1194  */
1195 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1196 {
1197         static const char *decimal = "0123456789";
1198         static const char *hex = "0123456789abcdef";
1199         int i, n;
1200
1201         if (*s++ == '=') {
1202                 /*
1203                  * Try matching against the supplied keywords,
1204                  * and return -(index+1) if we match one
1205                  */
1206                 if (keywords != NULL) {
1207                         for (i = 0; *keywords != NULL; ++i) {
1208                                 if (!strcmp(s, *keywords++))
1209                                         return -(i+1);
1210                         }
1211                 }
1212                 /*
1213                  * Look for a series of no more than "max_vals"
1214                  * numeric values separated by commas, in base10,
1215                  * or base16 when prefixed with "0x".
1216                  * Return a count of how many were found.
1217                  */
1218                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1219                         vals[n] = i;
1220                         while ((i = stridx(decimal, *++s)) >= 0)
1221                                 vals[n] = (vals[n] * 10) + i;
1222                         if (*s == 'x' && !vals[n]) {
1223                                 while ((i = stridx(hex, *++s)) >= 0)
1224                                         vals[n] = (vals[n] * 0x10) + i;
1225                         }
1226                         if (++n == max_vals)
1227                                 break;
1228                         if (*s == ',' || *s == ';')
1229                                 ++s;
1230                 }
1231                 if (!*s)
1232                         return n;
1233         }
1234         return 0;       /* zero = nothing matched */
1235 }
1236
1237 extern int probe_ali14xx;
1238 extern int probe_umc8672;
1239 extern int probe_dtc2278;
1240 extern int probe_ht6560b;
1241 extern int probe_qd65xx;
1242 extern int cmd640_vlb;
1243
1244 static int __initdata is_chipset_set[MAX_HWIFS];
1245
1246 /*
1247  * ide_setup() gets called VERY EARLY during initialization,
1248  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1249  *
1250  * Remember to update Documentation/ide.txt if you change something here.
1251  */
1252 static int __init ide_setup(char *s)
1253 {
1254         int i, vals[3];
1255         ide_hwif_t *hwif;
1256         ide_drive_t *drive;
1257         unsigned int hw, unit;
1258         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1259         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1260
1261         
1262         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1263                 return 0;                               /* driver and not us */
1264
1265         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1266                 return 0;
1267
1268         printk(KERN_INFO "ide_setup: %s", s);
1269         init_ide_data ();
1270
1271 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1272         if (!strcmp(s, "ide=doubler")) {
1273                 extern int ide_doubler;
1274
1275                 printk(" : Enabled support for IDE doublers\n");
1276                 ide_doubler = 1;
1277                 return 1;
1278         }
1279 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1280
1281         if (!strcmp(s, "ide=nodma")) {
1282                 printk(" : Prevented DMA\n");
1283                 noautodma = 1;
1284                 goto obsolete_option;
1285         }
1286
1287 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1288         if (!strcmp(s, "ide=reverse")) {
1289                 ide_scan_direction = 1;
1290                 printk(" : Enabled support for IDE inverse scan order.\n");
1291                 return 1;
1292         }
1293 #endif
1294
1295 #ifdef CONFIG_BLK_DEV_IDEACPI
1296         if (!strcmp(s, "ide=noacpi")) {
1297                 //printk(" : Disable IDE ACPI support.\n");
1298                 ide_noacpi = 1;
1299                 return 1;
1300         }
1301         if (!strcmp(s, "ide=acpigtf")) {
1302                 //printk(" : Enable IDE ACPI _GTF support.\n");
1303                 ide_noacpitfs = 0;
1304                 return 1;
1305         }
1306         if (!strcmp(s, "ide=acpionboot")) {
1307                 //printk(" : Call IDE ACPI methods on boot.\n");
1308                 ide_noacpionboot = 0;
1309                 return 1;
1310         }
1311 #endif /* CONFIG_BLK_DEV_IDEACPI */
1312
1313         /*
1314          * Look for drive options:  "hdx="
1315          */
1316         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1317                 const char *hd_words[] = {
1318                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1319                         "autotune", "noautotune", "-8", "-9", "-10",
1320                         "noflush", "remap", "remap63", "scsi", NULL };
1321                 unit = s[2] - 'a';
1322                 hw   = unit / MAX_DRIVES;
1323                 unit = unit % MAX_DRIVES;
1324                 hwif = &ide_hwifs[hw];
1325                 drive = &hwif->drives[unit];
1326                 if (strncmp(s + 4, "ide-", 4) == 0) {
1327                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1328                         goto done;
1329                 }
1330                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1331                         case -1: /* "none" */
1332                         case -2: /* "noprobe" */
1333                                 drive->noprobe = 1;
1334                                 goto done;
1335                         case -3: /* "nowerr" */
1336                                 drive->bad_wstat = BAD_R_STAT;
1337                                 hwif->noprobe = 0;
1338                                 goto done;
1339                         case -4: /* "cdrom" */
1340                                 drive->present = 1;
1341                                 drive->media = ide_cdrom;
1342                                 /* an ATAPI device ignores DRDY */
1343                                 drive->ready_stat = 0;
1344                                 hwif->noprobe = 0;
1345                                 goto done;
1346                         case -5: /* nodma */
1347                                 drive->nodma = 1;
1348                                 goto done;
1349                         case -6: /* "autotune" */
1350                                 drive->autotune = IDE_TUNE_AUTO;
1351                                 goto obsolete_option;
1352                         case -7: /* "noautotune" */
1353                                 drive->autotune = IDE_TUNE_NOAUTO;
1354                                 goto obsolete_option;
1355                         case -11: /* noflush */
1356                                 drive->noflush = 1;
1357                                 goto done;
1358                         case -12: /* "remap" */
1359                                 drive->remap_0_to_1 = 1;
1360                                 goto done;
1361                         case -13: /* "remap63" */
1362                                 drive->sect0 = 63;
1363                                 goto done;
1364                         case -14: /* "scsi" */
1365                                 drive->scsi = 1;
1366                                 goto done;
1367                         case 3: /* cyl,head,sect */
1368                                 drive->media    = ide_disk;
1369                                 drive->ready_stat = READY_STAT;
1370                                 drive->cyl      = drive->bios_cyl  = vals[0];
1371                                 drive->head     = drive->bios_head = vals[1];
1372                                 drive->sect     = drive->bios_sect = vals[2];
1373                                 drive->present  = 1;
1374                                 drive->forced_geom = 1;
1375                                 hwif->noprobe = 0;
1376                                 goto done;
1377                         default:
1378                                 goto bad_option;
1379                 }
1380         }
1381
1382         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1383                 goto bad_option;
1384         /*
1385          * Look for bus speed option:  "idebus="
1386          */
1387         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1388                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1389                         goto bad_option;
1390                 if (vals[0] >= 20 && vals[0] <= 66) {
1391                         idebus_parameter = vals[0];
1392                 } else
1393                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1394                 goto done;
1395         }
1396         /*
1397          * Look for interface options:  "idex="
1398          */
1399         if (s[3] >= '0' && s[3] <= max_hwif) {
1400                 /*
1401                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1402                  * (-8, -9, -10) are reserved to ease the hardcoding.
1403                  */
1404                 static const char *ide_words[] = {
1405                         "noprobe", "serialize", "minus3", "minus4",
1406                         "reset", "minus6", "ata66", "minus8", "minus9",
1407                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1408                         "dtc2278", "umc8672", "ali14xx", NULL };
1409
1410                 hw_regs_t hwregs;
1411
1412                 hw = s[3] - '0';
1413                 hwif = &ide_hwifs[hw];
1414                 i = match_parm(&s[4], ide_words, vals, 3);
1415
1416                 /*
1417                  * Cryptic check to ensure chipset not already set for hwif.
1418                  * Note: we can't depend on hwif->chipset here.
1419                  */
1420                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1421                         /* chipset already specified */
1422                         if (is_chipset_set[hw])
1423                                 goto bad_option;
1424                         if (i > -18 && i <= -11) {
1425                                 /* these drivers are for "ide0=" only */
1426                                 if (hw != 0)
1427                                         goto bad_hwif;
1428                                 /* chipset already specified for 2nd port */
1429                                 if (is_chipset_set[hw+1])
1430                                         goto bad_option;
1431                         }
1432                         is_chipset_set[hw] = 1;
1433                         printk("\n");
1434                 }
1435
1436                 switch (i) {
1437 #ifdef CONFIG_BLK_DEV_ALI14XX
1438                         case -17: /* "ali14xx" */
1439                                 probe_ali14xx = 1;
1440                                 goto done;
1441 #endif
1442 #ifdef CONFIG_BLK_DEV_UMC8672
1443                         case -16: /* "umc8672" */
1444                                 probe_umc8672 = 1;
1445                                 goto done;
1446 #endif
1447 #ifdef CONFIG_BLK_DEV_DTC2278
1448                         case -15: /* "dtc2278" */
1449                                 probe_dtc2278 = 1;
1450                                 goto done;
1451 #endif
1452 #ifdef CONFIG_BLK_DEV_CMD640
1453                         case -14: /* "cmd640_vlb" */
1454                                 cmd640_vlb = 1;
1455                                 goto done;
1456 #endif
1457 #ifdef CONFIG_BLK_DEV_HT6560B
1458                         case -13: /* "ht6560b" */
1459                                 probe_ht6560b = 1;
1460                                 goto done;
1461 #endif
1462 #ifdef CONFIG_BLK_DEV_QD65XX
1463                         case -12: /* "qd65xx" */
1464                                 probe_qd65xx = 1;
1465                                 goto done;
1466 #endif
1467 #ifdef CONFIG_BLK_DEV_4DRIVES
1468                         case -11: /* "four" drives on one set of ports */
1469                         {
1470                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1471                                 mate->drives[0].select.all ^= 0x20;
1472                                 mate->drives[1].select.all ^= 0x20;
1473                                 hwif->chipset = mate->chipset = ide_4drives;
1474                                 mate->irq = hwif->irq;
1475                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1476                                 hwif->mate = mate;
1477                                 mate->mate = hwif;
1478                                 hwif->serialized = mate->serialized = 1;
1479                                 goto obsolete_option;
1480                         }
1481 #endif /* CONFIG_BLK_DEV_4DRIVES */
1482                         case -10: /* minus10 */
1483                         case -9: /* minus9 */
1484                         case -8: /* minus8 */
1485                         case -6:
1486                         case -4:
1487                         case -3:
1488                                 goto bad_option;
1489                         case -7: /* ata66 */
1490 #ifdef CONFIG_BLK_DEV_IDEPCI
1491                                 /*
1492                                  * Use ATA_CBL_PATA40_SHORT so drive side
1493                                  * cable detection is also overriden.
1494                                  */
1495                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1496                                 goto obsolete_option;
1497 #else
1498                                 goto bad_hwif;
1499 #endif
1500                         case -5: /* "reset" */
1501                                 hwif->reset = 1;
1502                                 goto obsolete_option;
1503                         case -2: /* "serialize" */
1504                                 hwif->mate = &ide_hwifs[hw^1];
1505                                 hwif->mate->mate = hwif;
1506                                 hwif->serialized = hwif->mate->serialized = 1;
1507                                 goto obsolete_option;
1508
1509                         case -1: /* "noprobe" */
1510                                 hwif->noprobe = 1;
1511                                 goto done;
1512
1513                         case 1: /* base */
1514                                 vals[1] = vals[0] + 0x206; /* default ctl */
1515                         case 2: /* base,ctl */
1516                                 vals[2] = 0;    /* default irq = probe for it */
1517                         case 3: /* base,ctl,irq */
1518                                 memset(&hwregs, 0, sizeof(hwregs));
1519                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1520                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1521                                 hwif->irq      = vals[2];
1522                                 hwif->noprobe  = 0;
1523                                 hwif->chipset  = ide_forced;
1524                                 goto obsolete_option;
1525
1526                         case 0: goto bad_option;
1527                         default:
1528                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1529                                 return 1;
1530                 }
1531         }
1532 bad_option:
1533         printk(" -- BAD OPTION\n");
1534         return 1;
1535 obsolete_option:
1536         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1537         return 1;
1538 bad_hwif:
1539         printk("-- NOT SUPPORTED ON ide%d", hw);
1540 done:
1541         printk("\n");
1542         return 1;
1543 }
1544
1545 EXPORT_SYMBOL(ide_lock);
1546
1547 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1548 {
1549         return 1;
1550 }
1551
1552 static char *media_string(ide_drive_t *drive)
1553 {
1554         switch (drive->media) {
1555         case ide_disk:
1556                 return "disk";
1557         case ide_cdrom:
1558                 return "cdrom";
1559         case ide_tape:
1560                 return "tape";
1561         case ide_floppy:
1562                 return "floppy";
1563         case ide_optical:
1564                 return "optical";
1565         default:
1566                 return "UNKNOWN";
1567         }
1568 }
1569
1570 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1571 {
1572         ide_drive_t *drive = to_ide_device(dev);
1573         return sprintf(buf, "%s\n", media_string(drive));
1574 }
1575
1576 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1577 {
1578         ide_drive_t *drive = to_ide_device(dev);
1579         return sprintf(buf, "%s\n", drive->name);
1580 }
1581
1582 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1583 {
1584         ide_drive_t *drive = to_ide_device(dev);
1585         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1586 }
1587
1588 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1589                           char *buf)
1590 {
1591         ide_drive_t *drive = to_ide_device(dev);
1592         return sprintf(buf, "%s\n", drive->id->model);
1593 }
1594
1595 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1596                              char *buf)
1597 {
1598         ide_drive_t *drive = to_ide_device(dev);
1599         return sprintf(buf, "%s\n", drive->id->fw_rev);
1600 }
1601
1602 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1603                            char *buf)
1604 {
1605         ide_drive_t *drive = to_ide_device(dev);
1606         return sprintf(buf, "%s\n", drive->id->serial_no);
1607 }
1608
1609 static struct device_attribute ide_dev_attrs[] = {
1610         __ATTR_RO(media),
1611         __ATTR_RO(drivename),
1612         __ATTR_RO(modalias),
1613         __ATTR_RO(model),
1614         __ATTR_RO(firmware),
1615         __ATTR(serial, 0400, serial_show, NULL),
1616         __ATTR_NULL
1617 };
1618
1619 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1620 {
1621         ide_drive_t *drive = to_ide_device(dev);
1622
1623         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1624         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1625         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1626         return 0;
1627 }
1628
1629 static int generic_ide_probe(struct device *dev)
1630 {
1631         ide_drive_t *drive = to_ide_device(dev);
1632         ide_driver_t *drv = to_ide_driver(dev->driver);
1633
1634         return drv->probe ? drv->probe(drive) : -ENODEV;
1635 }
1636
1637 static int generic_ide_remove(struct device *dev)
1638 {
1639         ide_drive_t *drive = to_ide_device(dev);
1640         ide_driver_t *drv = to_ide_driver(dev->driver);
1641
1642         if (drv->remove)
1643                 drv->remove(drive);
1644
1645         return 0;
1646 }
1647
1648 static void generic_ide_shutdown(struct device *dev)
1649 {
1650         ide_drive_t *drive = to_ide_device(dev);
1651         ide_driver_t *drv = to_ide_driver(dev->driver);
1652
1653         if (dev->driver && drv->shutdown)
1654                 drv->shutdown(drive);
1655 }
1656
1657 struct bus_type ide_bus_type = {
1658         .name           = "ide",
1659         .match          = ide_bus_match,
1660         .uevent         = ide_uevent,
1661         .probe          = generic_ide_probe,
1662         .remove         = generic_ide_remove,
1663         .shutdown       = generic_ide_shutdown,
1664         .dev_attrs      = ide_dev_attrs,
1665         .suspend        = generic_ide_suspend,
1666         .resume         = generic_ide_resume,
1667 };
1668
1669 EXPORT_SYMBOL_GPL(ide_bus_type);
1670
1671 /*
1672  * This is gets invoked once during initialization, to set *everything* up
1673  */
1674 static int __init ide_init(void)
1675 {
1676         int ret;
1677
1678         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1679         system_bus_speed = ide_system_bus_speed();
1680
1681         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1682                          "for PIO modes%s\n", system_bus_speed,
1683                         idebus_parameter ? "" : "; override with idebus=xx");
1684
1685         ret = bus_register(&ide_bus_type);
1686         if (ret < 0) {
1687                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1688                 return ret;
1689         }
1690
1691         init_ide_data();
1692
1693         proc_ide_create();
1694
1695         return 0;
1696 }
1697
1698 #ifdef MODULE
1699 static char *options = NULL;
1700 module_param(options, charp, 0);
1701 MODULE_LICENSE("GPL");
1702
1703 static void __init parse_options (char *line)
1704 {
1705         char *next = line;
1706
1707         if (line == NULL || !*line)
1708                 return;
1709         while ((line = next) != NULL) {
1710                 if ((next = strchr(line,' ')) != NULL)
1711                         *next++ = 0;
1712                 if (!ide_setup(line))
1713                         printk (KERN_INFO "Unknown option '%s'\n", line);
1714         }
1715 }
1716
1717 int __init init_module (void)
1718 {
1719         parse_options(options);
1720         return ide_init();
1721 }
1722
1723 void __exit cleanup_module (void)
1724 {
1725         int index;
1726
1727         for (index = 0; index < MAX_HWIFS; ++index)
1728                 ide_unregister(index, 0, 0);
1729
1730         proc_ide_destroy();
1731
1732         bus_unregister(&ide_bus_type);
1733 }
1734
1735 #else /* !MODULE */
1736
1737 __setup("", ide_setup);
1738
1739 module_init(ide_init);
1740
1741 #endif /* MODULE */