31bc28aacdc96b741561505305602dc6966bf690
[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 _IDE_C                  /* Tell ide.h it's really us */
48
49 #include <linux/module.h>
50 #include <linux/types.h>
51 #include <linux/string.h>
52 #include <linux/kernel.h>
53 #include <linux/timer.h>
54 #include <linux/mm.h>
55 #include <linux/interrupt.h>
56 #include <linux/major.h>
57 #include <linux/errno.h>
58 #include <linux/genhd.h>
59 #include <linux/blkpg.h>
60 #include <linux/slab.h>
61 #include <linux/init.h>
62 #include <linux/pci.h>
63 #include <linux/delay.h>
64 #include <linux/ide.h>
65 #include <linux/completion.h>
66 #include <linux/reboot.h>
67 #include <linux/cdrom.h>
68 #include <linux/seq_file.h>
69 #include <linux/device.h>
70 #include <linux/bitops.h>
71
72 #include <asm/byteorder.h>
73 #include <asm/irq.h>
74 #include <asm/uaccess.h>
75 #include <asm/io.h>
76
77
78 /* default maximum number of failures */
79 #define IDE_DEFAULT_MAX_FAILURES        1
80
81 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
82                                         IDE2_MAJOR, IDE3_MAJOR,
83                                         IDE4_MAJOR, IDE5_MAJOR,
84                                         IDE6_MAJOR, IDE7_MAJOR,
85                                         IDE8_MAJOR, IDE9_MAJOR };
86
87 static int idebus_parameter;    /* holds the "idebus=" parameter */
88 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
89
90 DEFINE_MUTEX(ide_cfg_mtx);
91  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
92
93 int noautodma = 0;
94
95 #ifdef CONFIG_BLK_DEV_IDEACPI
96 int ide_noacpi = 0;
97 int ide_noacpitfs = 1;
98 int ide_noacpionboot = 1;
99 #endif
100
101 /*
102  * This is declared extern in ide.h, for access by other IDE modules:
103  */
104 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
105
106 EXPORT_SYMBOL(ide_hwifs);
107
108 /*
109  * Do not even *think* about calling this!
110  */
111 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
112 {
113         unsigned int unit;
114
115         /* bulk initialize hwif & drive info with zeros */
116         memset(hwif, 0, sizeof(ide_hwif_t));
117
118         /* fill in any non-zero initial values */
119         hwif->index     = index;
120         hwif->major     = ide_hwif_to_major[index];
121
122         hwif->name[0]   = 'i';
123         hwif->name[1]   = 'd';
124         hwif->name[2]   = 'e';
125         hwif->name[3]   = '0' + index;
126
127         hwif->bus_state = BUSSTATE_ON;
128
129         init_completion(&hwif->gendev_rel_comp);
130
131         default_hwif_iops(hwif);
132         default_hwif_transport(hwif);
133         for (unit = 0; unit < MAX_DRIVES; ++unit) {
134                 ide_drive_t *drive = &hwif->drives[unit];
135
136                 drive->media                    = ide_disk;
137                 drive->select.all               = (unit<<4)|0xa0;
138                 drive->hwif                     = hwif;
139                 drive->ctl                      = 0x08;
140                 drive->ready_stat               = READY_STAT;
141                 drive->bad_wstat                = BAD_W_STAT;
142                 drive->special.b.recalibrate    = 1;
143                 drive->special.b.set_geometry   = 1;
144                 drive->name[0]                  = 'h';
145                 drive->name[1]                  = 'd';
146                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
147                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
148                 drive->using_dma                = 0;
149                 drive->vdma                     = 0;
150                 INIT_LIST_HEAD(&drive->list);
151                 init_completion(&drive->gendev_rel_comp);
152         }
153 }
154 EXPORT_SYMBOL_GPL(ide_init_port_data);
155
156 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
157 {
158         hw_regs_t hw;
159
160         memset(&hw, 0, sizeof(hw_regs_t));
161
162         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
163
164         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
165
166         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
167 #ifdef CONFIG_BLK_DEV_HD
168         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
169                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
170 #endif
171 }
172
173 /*
174  * init_ide_data() sets reasonable default values into all fields
175  * of all instances of the hwifs and drives, but only on the first call.
176  * Subsequent calls have no effect (they don't wipe out anything).
177  *
178  * This routine is normally called at driver initialization time,
179  * but may also be called MUCH earlier during kernel "command-line"
180  * parameter processing.  As such, we cannot depend on any other parts
181  * of the kernel (such as memory allocation) to be functioning yet.
182  *
183  * This is too bad, as otherwise we could dynamically allocate the
184  * ide_drive_t structs as needed, rather than always consuming memory
185  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
186  *
187  * FIXME: We should stuff the setup data into __init and copy the
188  * relevant hwifs/allocate them properly during boot.
189  */
190 #define MAGIC_COOKIE 0x12345678
191 static void __init init_ide_data (void)
192 {
193         ide_hwif_t *hwif;
194         unsigned int index;
195         static unsigned long magic_cookie = MAGIC_COOKIE;
196
197         if (magic_cookie != MAGIC_COOKIE)
198                 return;         /* already initialized */
199         magic_cookie = 0;
200
201         /* Initialise all interface structures */
202         for (index = 0; index < MAX_HWIFS; ++index) {
203                 hwif = &ide_hwifs[index];
204                 ide_init_port_data(hwif, index);
205                 init_hwif_default(hwif, index);
206 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
207                 hwif->irq =
208                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
209 #endif
210         }
211 }
212
213 /**
214  *      ide_system_bus_speed    -       guess bus speed
215  *
216  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
217  *      bus speed (in MHz). This is used for calculating interface PIO timings.
218  *      The default is 40 for known PCI systems, 50 otherwise.
219  *      The "idebus=xx" parameter can be used to override this value.
220  *      The actual value to be used is computed/displayed the first time
221  *      through. Drivers should only use this as a last resort.
222  *
223  *      Returns a guessed speed in MHz.
224  */
225
226 static int ide_system_bus_speed(void)
227 {
228 #ifdef CONFIG_PCI
229         static struct pci_device_id pci_default[] = {
230                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
231                 { }
232         };
233 #else
234 #define pci_default 0
235 #endif /* CONFIG_PCI */
236
237         /* user supplied value */
238         if (idebus_parameter)
239                 return idebus_parameter;
240
241         /* safe default value for PCI or VESA and PCI*/
242         return pci_dev_present(pci_default) ? 33 : 50;
243 }
244
245 ide_hwif_t * ide_find_port(unsigned long base)
246 {
247         ide_hwif_t *hwif;
248         int i;
249
250         for (i = 0; i < MAX_HWIFS; i++) {
251                 hwif = &ide_hwifs[i];
252                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
253                         goto found;
254         }
255
256         for (i = 0; i < MAX_HWIFS; i++) {
257                 hwif = &ide_hwifs[i];
258                 if (hwif->chipset == ide_unknown)
259                         goto found;
260         }
261
262         hwif = NULL;
263 found:
264         return hwif;
265 }
266
267 EXPORT_SYMBOL_GPL(ide_find_port);
268
269 static struct resource* hwif_request_region(ide_hwif_t *hwif,
270                                             unsigned long addr, int num)
271 {
272         struct resource *res = request_region(addr, num, hwif->name);
273
274         if (!res)
275                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
276                                 hwif->name, addr, addr+num-1);
277         return res;
278 }
279
280 /**
281  *      ide_hwif_request_regions - request resources for IDE
282  *      @hwif: interface to use
283  *
284  *      Requests all the needed resources for an interface.
285  *      Right now core IDE code does this work which is deeply wrong.
286  *      MMIO leaves it to the controller driver,
287  *      PIO will migrate this way over time.
288  */
289
290 int ide_hwif_request_regions(ide_hwif_t *hwif)
291 {
292         unsigned long addr;
293         unsigned int i;
294
295         if (hwif->mmio)
296                 return 0;
297         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
298         if (addr && !hwif_request_region(hwif, addr, 1))
299                 goto control_region_busy;
300         hwif->straight8 = 0;
301         addr = hwif->io_ports[IDE_DATA_OFFSET];
302         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
303                 if (!hwif_request_region(hwif, addr, 8))
304                         goto data_region_busy;
305                 hwif->straight8 = 1;
306                 return 0;
307         }
308         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
309                 addr = hwif->io_ports[i];
310                 if (!hwif_request_region(hwif, addr, 1)) {
311                         while (--i)
312                                 release_region(addr, 1);
313                         goto data_region_busy;
314                 }
315         }
316         return 0;
317
318 data_region_busy:
319         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
320         if (addr)
321                 release_region(addr, 1);
322 control_region_busy:
323         /* If any errors are return, we drop the hwif interface. */
324         return -EBUSY;
325 }
326
327 /**
328  *      ide_hwif_release_regions - free IDE resources
329  *
330  *      Note that we only release the standard ports,
331  *      and do not even try to handle any extra ports
332  *      allocated for weird IDE interface chipsets.
333  *
334  *      Note also that we don't yet handle mmio resources here. More
335  *      importantly our caller should be doing this so we need to 
336  *      restructure this as a helper function for drivers.
337  */
338
339 void ide_hwif_release_regions(ide_hwif_t *hwif)
340 {
341         u32 i = 0;
342
343         if (hwif->mmio)
344                 return;
345         if (hwif->io_ports[IDE_CONTROL_OFFSET])
346                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
347         if (hwif->straight8) {
348                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
349                 return;
350         }
351         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
352                 if (hwif->io_ports[i])
353                         release_region(hwif->io_ports[i], 1);
354 }
355
356 /**
357  *      ide_hwif_restore        -       restore hwif to template
358  *      @hwif: hwif to update
359  *      @tmp_hwif: template
360  *
361  *      Restore hwif to a previous state by copying most settings
362  *      from the template.
363  */
364
365 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
366 {
367         hwif->hwgroup                   = tmp_hwif->hwgroup;
368
369         hwif->gendev.parent             = tmp_hwif->gendev.parent;
370
371         hwif->proc                      = tmp_hwif->proc;
372
373         hwif->major                     = tmp_hwif->major;
374         hwif->straight8                 = tmp_hwif->straight8;
375         hwif->bus_state                 = tmp_hwif->bus_state;
376
377         hwif->host_flags                = tmp_hwif->host_flags;
378
379         hwif->pio_mask                  = tmp_hwif->pio_mask;
380
381         hwif->ultra_mask                = tmp_hwif->ultra_mask;
382         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
383         hwif->swdma_mask                = tmp_hwif->swdma_mask;
384
385         hwif->cbl                       = tmp_hwif->cbl;
386
387         hwif->chipset                   = tmp_hwif->chipset;
388         hwif->hold                      = tmp_hwif->hold;
389
390         hwif->dev                       = tmp_hwif->dev;
391
392 #ifdef CONFIG_BLK_DEV_IDEPCI
393         hwif->cds                       = tmp_hwif->cds;
394 #endif
395
396         hwif->set_pio_mode              = tmp_hwif->set_pio_mode;
397         hwif->set_dma_mode              = tmp_hwif->set_dma_mode;
398         hwif->mdma_filter               = tmp_hwif->mdma_filter;
399         hwif->udma_filter               = tmp_hwif->udma_filter;
400         hwif->selectproc                = tmp_hwif->selectproc;
401         hwif->reset_poll                = tmp_hwif->reset_poll;
402         hwif->pre_reset                 = tmp_hwif->pre_reset;
403         hwif->resetproc                 = tmp_hwif->resetproc;
404         hwif->maskproc                  = tmp_hwif->maskproc;
405         hwif->quirkproc                 = tmp_hwif->quirkproc;
406         hwif->busproc                   = tmp_hwif->busproc;
407
408         hwif->ata_input_data            = tmp_hwif->ata_input_data;
409         hwif->ata_output_data           = tmp_hwif->ata_output_data;
410         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
411         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
412
413         hwif->dma_host_set              = tmp_hwif->dma_host_set;
414         hwif->dma_setup                 = tmp_hwif->dma_setup;
415         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
416         hwif->dma_start                 = tmp_hwif->dma_start;
417         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
418         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
419         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
420         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
421         hwif->dma_timeout               = tmp_hwif->dma_timeout;
422
423         hwif->OUTB                      = tmp_hwif->OUTB;
424         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
425         hwif->OUTW                      = tmp_hwif->OUTW;
426         hwif->OUTSW                     = tmp_hwif->OUTSW;
427         hwif->OUTSL                     = tmp_hwif->OUTSL;
428
429         hwif->INB                       = tmp_hwif->INB;
430         hwif->INW                       = tmp_hwif->INW;
431         hwif->INSW                      = tmp_hwif->INSW;
432         hwif->INSL                      = tmp_hwif->INSL;
433
434         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
435
436         hwif->mmio                      = tmp_hwif->mmio;
437         hwif->rqsize                    = tmp_hwif->rqsize;
438
439 #ifndef CONFIG_BLK_DEV_IDECS
440         hwif->irq                       = tmp_hwif->irq;
441 #endif
442
443         hwif->dma_base                  = tmp_hwif->dma_base;
444         hwif->dma_command               = tmp_hwif->dma_command;
445         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
446         hwif->dma_status                = tmp_hwif->dma_status;
447         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
448         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
449
450         hwif->config_data               = tmp_hwif->config_data;
451         hwif->select_data               = tmp_hwif->select_data;
452         hwif->extra_base                = tmp_hwif->extra_base;
453         hwif->extra_ports               = tmp_hwif->extra_ports;
454
455         hwif->hwif_data                 = tmp_hwif->hwif_data;
456 }
457
458 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
459 {
460         ide_hwgroup_t *hwgroup = hwif->hwgroup;
461
462         spin_lock_irq(&ide_lock);
463         /*
464          * Remove us from the hwgroup, and free
465          * the hwgroup if we were the only member
466          */
467         if (hwif->next == hwif) {
468                 BUG_ON(hwgroup->hwif != hwif);
469                 kfree(hwgroup);
470         } else {
471                 /* There is another interface in hwgroup.
472                  * Unlink us, and set hwgroup->drive and ->hwif to
473                  * something sane.
474                  */
475                 ide_hwif_t *g = hwgroup->hwif;
476
477                 while (g->next != hwif)
478                         g = g->next;
479                 g->next = hwif->next;
480                 if (hwgroup->hwif == hwif) {
481                         /* Chose a random hwif for hwgroup->hwif.
482                          * It's guaranteed that there are no drives
483                          * left in the hwgroup.
484                          */
485                         BUG_ON(hwgroup->drive != NULL);
486                         hwgroup->hwif = g;
487                 }
488                 BUG_ON(hwgroup->hwif == hwif);
489         }
490         spin_unlock_irq(&ide_lock);
491 }
492
493 /* Called with ide_lock held. */
494 static void ide_port_unregister_devices(ide_hwif_t *hwif)
495 {
496         int i;
497
498         for (i = 0; i < MAX_DRIVES; i++) {
499                 ide_drive_t *drive = &hwif->drives[i];
500
501                 if (drive->present) {
502                         spin_unlock_irq(&ide_lock);
503                         device_unregister(&drive->gendev);
504                         wait_for_completion(&drive->gendev_rel_comp);
505                         spin_lock_irq(&ide_lock);
506                 }
507         }
508 }
509
510 /**
511  *      ide_unregister          -       free an IDE interface
512  *      @index: index of interface (will change soon to a pointer)
513  *      @init_default: init default hwif flag
514  *      @restore: restore hwif flag
515  *
516  *      Perform the final unregister of an IDE interface. At the moment
517  *      we don't refcount interfaces so this will also get split up.
518  *
519  *      Locking:
520  *      The caller must not hold the IDE locks
521  *      The drive present/vanishing is not yet properly locked
522  *      Take care with the callbacks. These have been split to avoid
523  *      deadlocking the IDE layer. The shutdown callback is called
524  *      before we take the lock and free resources. It is up to the
525  *      caller to be sure there is no pending I/O here, and that
526  *      the interface will not be reopened (present/vanishing locking
527  *      isn't yet done BTW). After we commit to the final kill we
528  *      call the cleanup callback with the ide locks held.
529  *
530  *      Unregister restores the hwif structures to the default state.
531  *      This is raving bonkers.
532  */
533
534 void ide_unregister(unsigned int index, int init_default, int restore)
535 {
536         ide_hwif_t *hwif, *g;
537         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
538         ide_hwgroup_t *hwgroup;
539         int irq_count = 0;
540
541         BUG_ON(index >= MAX_HWIFS);
542
543         BUG_ON(in_interrupt());
544         BUG_ON(irqs_disabled());
545         mutex_lock(&ide_cfg_mtx);
546         spin_lock_irq(&ide_lock);
547         hwif = &ide_hwifs[index];
548         if (!hwif->present)
549                 goto abort;
550         ide_port_unregister_devices(hwif);
551         hwif->present = 0;
552
553         spin_unlock_irq(&ide_lock);
554
555         ide_proc_unregister_port(hwif);
556
557         hwgroup = hwif->hwgroup;
558         /*
559          * free the irq if we were the only hwif using it
560          */
561         g = hwgroup->hwif;
562         do {
563                 if (g->irq == hwif->irq)
564                         ++irq_count;
565                 g = g->next;
566         } while (g != hwgroup->hwif);
567         if (irq_count == 1)
568                 free_irq(hwif->irq, hwgroup);
569
570         ide_remove_port_from_hwgroup(hwif);
571
572         device_unregister(&hwif->gendev);
573         wait_for_completion(&hwif->gendev_rel_comp);
574
575         /*
576          * Remove us from the kernel's knowledge
577          */
578         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
579         kfree(hwif->sg_table);
580         unregister_blkdev(hwif->major, hwif->name);
581         spin_lock_irq(&ide_lock);
582
583         if (hwif->dma_base) {
584                 (void) ide_release_dma(hwif);
585
586                 hwif->dma_base = 0;
587                 hwif->dma_command = 0;
588                 hwif->dma_vendor1 = 0;
589                 hwif->dma_status = 0;
590                 hwif->dma_vendor3 = 0;
591                 hwif->dma_prdtable = 0;
592
593                 hwif->extra_base  = 0;
594                 hwif->extra_ports = 0;
595         }
596
597         ide_hwif_release_regions(hwif);
598
599         /* copy original settings */
600         tmp_hwif = *hwif;
601
602         /* restore hwif data to pristine status */
603         ide_init_port_data(hwif, index);
604
605         if (init_default)
606                 init_hwif_default(hwif, index);
607
608         if (restore)
609                 ide_hwif_restore(hwif, &tmp_hwif);
610
611 abort:
612         spin_unlock_irq(&ide_lock);
613         mutex_unlock(&ide_cfg_mtx);
614 }
615
616 EXPORT_SYMBOL(ide_unregister);
617
618 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
619 {
620         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
621         hwif->irq = hw->irq;
622         hwif->noprobe = 0;
623         hwif->chipset = hw->chipset;
624         hwif->gendev.parent = hw->dev;
625         hwif->ack_intr = hw->ack_intr;
626 }
627 EXPORT_SYMBOL_GPL(ide_init_port_hw);
628
629 /**
630  *      ide_register_hw         -       register IDE interface
631  *      @hw: hardware registers
632  *      @quirkproc: quirkproc function
633  *      @hwifp: pointer to returned hwif
634  *
635  *      Register an IDE interface, specifying exactly the registers etc.
636  *
637  *      Returns -1 on error.
638  */
639
640 int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
641                     ide_hwif_t **hwifp)
642 {
643         int index, retry = 1;
644         ide_hwif_t *hwif;
645         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
646
647         do {
648                 hwif = ide_find_port(hw->io_ports[IDE_DATA_OFFSET]);
649                 if (hwif)
650                         goto found;
651                 for (index = 0; index < MAX_HWIFS; index++)
652                         ide_unregister(index, 1, 1);
653         } while (retry--);
654         return -1;
655 found:
656         index = hwif->index;
657         if (hwif->present)
658                 ide_unregister(index, 0, 1);
659         else if (!hwif->hold)
660                 ide_init_port_data(hwif, index);
661
662         ide_init_port_hw(hwif, hw);
663         hwif->quirkproc = quirkproc;
664
665         idx[0] = index;
666
667         ide_device_add(idx, NULL);
668
669         if (hwifp)
670                 *hwifp = hwif;
671
672         return hwif->present ? index : -1;
673 }
674
675 EXPORT_SYMBOL(ide_register_hw);
676
677 /*
678  *      Locks for IDE setting functionality
679  */
680
681 DEFINE_MUTEX(ide_setting_mtx);
682
683 EXPORT_SYMBOL_GPL(ide_setting_mtx);
684
685 /**
686  *      ide_spin_wait_hwgroup   -       wait for group
687  *      @drive: drive in the group
688  *
689  *      Wait for an IDE device group to go non busy and then return
690  *      holding the ide_lock which guards the hwgroup->busy status
691  *      and right to use it.
692  */
693
694 int ide_spin_wait_hwgroup (ide_drive_t *drive)
695 {
696         ide_hwgroup_t *hwgroup = HWGROUP(drive);
697         unsigned long timeout = jiffies + (3 * HZ);
698
699         spin_lock_irq(&ide_lock);
700
701         while (hwgroup->busy) {
702                 unsigned long lflags;
703                 spin_unlock_irq(&ide_lock);
704                 local_irq_set(lflags);
705                 if (time_after(jiffies, timeout)) {
706                         local_irq_restore(lflags);
707                         printk(KERN_ERR "%s: channel busy\n", drive->name);
708                         return -EBUSY;
709                 }
710                 local_irq_restore(lflags);
711                 spin_lock_irq(&ide_lock);
712         }
713         return 0;
714 }
715
716 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
717
718 int set_io_32bit(ide_drive_t *drive, int arg)
719 {
720         if (drive->no_io_32bit)
721                 return -EPERM;
722
723         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
724                 return -EINVAL;
725
726         if (ide_spin_wait_hwgroup(drive))
727                 return -EBUSY;
728
729         drive->io_32bit = arg;
730
731         spin_unlock_irq(&ide_lock);
732
733         return 0;
734 }
735
736 static int set_ksettings(ide_drive_t *drive, int arg)
737 {
738         if (arg < 0 || arg > 1)
739                 return -EINVAL;
740
741         if (ide_spin_wait_hwgroup(drive))
742                 return -EBUSY;
743         drive->keep_settings = arg;
744         spin_unlock_irq(&ide_lock);
745
746         return 0;
747 }
748
749 int set_using_dma(ide_drive_t *drive, int arg)
750 {
751 #ifdef CONFIG_BLK_DEV_IDEDMA
752         ide_hwif_t *hwif = drive->hwif;
753         int err = -EPERM;
754
755         if (arg < 0 || arg > 1)
756                 return -EINVAL;
757
758         if (!drive->id || !(drive->id->capability & 1))
759                 goto out;
760
761         if (hwif->dma_host_set == NULL)
762                 goto out;
763
764         err = -EBUSY;
765         if (ide_spin_wait_hwgroup(drive))
766                 goto out;
767         /*
768          * set ->busy flag, unlock and let it ride
769          */
770         hwif->hwgroup->busy = 1;
771         spin_unlock_irq(&ide_lock);
772
773         err = 0;
774
775         if (arg) {
776                 if (ide_set_dma(drive))
777                         err = -EIO;
778         } else
779                 ide_dma_off(drive);
780
781         /*
782          * lock, clear ->busy flag and unlock before leaving
783          */
784         spin_lock_irq(&ide_lock);
785         hwif->hwgroup->busy = 0;
786         spin_unlock_irq(&ide_lock);
787 out:
788         return err;
789 #else
790         if (arg < 0 || arg > 1)
791                 return -EINVAL;
792
793         return -EPERM;
794 #endif
795 }
796
797 int set_pio_mode(ide_drive_t *drive, int arg)
798 {
799         struct request rq;
800
801         if (arg < 0 || arg > 255)
802                 return -EINVAL;
803
804         if (drive->hwif->set_pio_mode == NULL)
805                 return -ENOSYS;
806
807         if (drive->special.b.set_tune)
808                 return -EBUSY;
809
810         ide_init_drive_cmd(&rq);
811         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
812
813         drive->tune_req = (u8) arg;
814         drive->special.b.set_tune = 1;
815         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
816         return 0;
817 }
818
819 static int set_unmaskirq(ide_drive_t *drive, int arg)
820 {
821         if (drive->no_unmask)
822                 return -EPERM;
823
824         if (arg < 0 || arg > 1)
825                 return -EINVAL;
826
827         if (ide_spin_wait_hwgroup(drive))
828                 return -EBUSY;
829         drive->unmask = arg;
830         spin_unlock_irq(&ide_lock);
831
832         return 0;
833 }
834
835 /**
836  *      system_bus_clock        -       clock guess
837  *
838  *      External version of the bus clock guess used by very old IDE drivers
839  *      for things like VLB timings. Should not be used.
840  */
841
842 int system_bus_clock (void)
843 {
844         return system_bus_speed;
845 }
846
847 EXPORT_SYMBOL(system_bus_clock);
848
849 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
850 {
851         ide_drive_t *drive = dev->driver_data;
852         ide_hwif_t *hwif = HWIF(drive);
853         struct request rq;
854         struct request_pm_state rqpm;
855         ide_task_t args;
856         int ret;
857
858         /* Call ACPI _GTM only once */
859         if (!(drive->dn % 2))
860                 ide_acpi_get_timing(hwif);
861
862         memset(&rq, 0, sizeof(rq));
863         memset(&rqpm, 0, sizeof(rqpm));
864         memset(&args, 0, sizeof(args));
865         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
866         rq.special = &args;
867         rq.data = &rqpm;
868         rqpm.pm_step = ide_pm_state_start_suspend;
869         if (mesg.event == PM_EVENT_PRETHAW)
870                 mesg.event = PM_EVENT_FREEZE;
871         rqpm.pm_state = mesg.event;
872
873         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
874         /* only call ACPI _PS3 after both drivers are suspended */
875         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
876                  && hwif->drives[1].present)
877                  || !hwif->drives[0].present
878                  || !hwif->drives[1].present))
879                 ide_acpi_set_state(hwif, 0);
880         return ret;
881 }
882
883 static int generic_ide_resume(struct device *dev)
884 {
885         ide_drive_t *drive = dev->driver_data;
886         ide_hwif_t *hwif = HWIF(drive);
887         struct request rq;
888         struct request_pm_state rqpm;
889         ide_task_t args;
890         int err;
891
892         /* Call ACPI _STM only once */
893         if (!(drive->dn % 2)) {
894                 ide_acpi_set_state(hwif, 1);
895                 ide_acpi_push_timing(hwif);
896         }
897
898         ide_acpi_exec_tfs(drive);
899
900         memset(&rq, 0, sizeof(rq));
901         memset(&rqpm, 0, sizeof(rqpm));
902         memset(&args, 0, sizeof(args));
903         rq.cmd_type = REQ_TYPE_PM_RESUME;
904         rq.special = &args;
905         rq.data = &rqpm;
906         rqpm.pm_step = ide_pm_state_start_resume;
907         rqpm.pm_state = PM_EVENT_ON;
908
909         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
910
911         if (err == 0 && dev->driver) {
912                 ide_driver_t *drv = to_ide_driver(dev->driver);
913
914                 if (drv->resume)
915                         drv->resume(drive);
916         }
917
918         return err;
919 }
920
921 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
922                         unsigned int cmd, unsigned long arg)
923 {
924         unsigned long flags;
925         ide_driver_t *drv;
926         void __user *p = (void __user *)arg;
927         int err = 0, (*setfunc)(ide_drive_t *, int);
928         u8 *val;
929
930         switch (cmd) {
931         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
932         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
933         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
934         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
935         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
936         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
937         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
938         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
939         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
940         }
941
942         switch (cmd) {
943                 case HDIO_OBSOLETE_IDENTITY:
944                 case HDIO_GET_IDENTITY:
945                         if (bdev != bdev->bd_contains)
946                                 return -EINVAL;
947                         if (drive->id_read == 0)
948                                 return -ENOMSG;
949                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
950                                 return -EFAULT;
951                         return 0;
952
953                 case HDIO_GET_NICE:
954                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
955                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
956                                         drive->nice1 << IDE_NICE_1,
957                                         (long __user *) arg);
958 #ifdef CONFIG_IDE_TASK_IOCTL
959                 case HDIO_DRIVE_TASKFILE:
960                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
961                                 return -EACCES;
962                         switch(drive->media) {
963                                 case ide_disk:
964                                         return ide_taskfile_ioctl(drive, cmd, arg);
965                                 default:
966                                         return -ENOMSG;
967                         }
968 #endif /* CONFIG_IDE_TASK_IOCTL */
969
970                 case HDIO_DRIVE_CMD:
971                         if (!capable(CAP_SYS_RAWIO))
972                                 return -EACCES;
973                         return ide_cmd_ioctl(drive, cmd, arg);
974
975                 case HDIO_DRIVE_TASK:
976                         if (!capable(CAP_SYS_RAWIO))
977                                 return -EACCES;
978                         return ide_task_ioctl(drive, cmd, arg);
979
980                 case HDIO_SCAN_HWIF:
981                 {
982                         hw_regs_t hw;
983                         int args[3];
984                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
985                         if (copy_from_user(args, p, 3 * sizeof(int)))
986                                 return -EFAULT;
987                         memset(&hw, 0, sizeof(hw));
988                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
989                                             (unsigned long) args[1], NULL);
990                         hw.irq = args[2];
991                         if (ide_register_hw(&hw, NULL, NULL) == -1)
992                                 return -EIO;
993                         return 0;
994                 }
995                 case HDIO_UNREGISTER_HWIF:
996                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
997                         /* (arg > MAX_HWIFS) checked in function */
998                         ide_unregister(arg, 1, 1);
999                         return 0;
1000                 case HDIO_SET_NICE:
1001                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1002                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1003                                 return -EPERM;
1004                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1005                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1006                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1007                                 drive->dsc_overlap = 0;
1008                                 return -EPERM;
1009                         }
1010                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1011                         return 0;
1012                 case HDIO_DRIVE_RESET:
1013                         if (!capable(CAP_SYS_ADMIN))
1014                                 return -EACCES;
1015
1016                         /*
1017                          *      Abort the current command on the
1018                          *      group if there is one, taking
1019                          *      care not to allow anything else
1020                          *      to be queued and to die on the
1021                          *      spot if we miss one somehow
1022                          */
1023
1024                         spin_lock_irqsave(&ide_lock, flags);
1025
1026                         if (HWGROUP(drive)->resetting) {
1027                                 spin_unlock_irqrestore(&ide_lock, flags);
1028                                 return -EBUSY;
1029                         }
1030
1031                         ide_abort(drive, "drive reset");
1032
1033                         BUG_ON(HWGROUP(drive)->handler);
1034
1035                         /* Ensure nothing gets queued after we
1036                            drop the lock. Reset will clear the busy */
1037
1038                         HWGROUP(drive)->busy = 1;
1039                         spin_unlock_irqrestore(&ide_lock, flags);
1040                         (void) ide_do_reset(drive);
1041
1042                         return 0;
1043                 case HDIO_GET_BUSSTATE:
1044                         if (!capable(CAP_SYS_ADMIN))
1045                                 return -EACCES;
1046                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1047                                 return -EFAULT;
1048                         return 0;
1049
1050                 case HDIO_SET_BUSSTATE:
1051                         if (!capable(CAP_SYS_ADMIN))
1052                                 return -EACCES;
1053                         if (HWIF(drive)->busproc)
1054                                 return HWIF(drive)->busproc(drive, (int)arg);
1055                         return -EOPNOTSUPP;
1056                 default:
1057                         return -EINVAL;
1058         }
1059
1060 read_val:
1061         mutex_lock(&ide_setting_mtx);
1062         spin_lock_irqsave(&ide_lock, flags);
1063         err = *val;
1064         spin_unlock_irqrestore(&ide_lock, flags);
1065         mutex_unlock(&ide_setting_mtx);
1066         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1067
1068 set_val:
1069         if (bdev != bdev->bd_contains)
1070                 err = -EINVAL;
1071         else {
1072                 if (!capable(CAP_SYS_ADMIN))
1073                         err = -EACCES;
1074                 else {
1075                         mutex_lock(&ide_setting_mtx);
1076                         err = setfunc(drive, arg);
1077                         mutex_unlock(&ide_setting_mtx);
1078                 }
1079         }
1080         return err;
1081 }
1082
1083 EXPORT_SYMBOL(generic_ide_ioctl);
1084
1085 /*
1086  * stridx() returns the offset of c within s,
1087  * or -1 if c is '\0' or not found within s.
1088  */
1089 static int __init stridx (const char *s, char c)
1090 {
1091         char *i = strchr(s, c);
1092         return (i && c) ? i - s : -1;
1093 }
1094
1095 /*
1096  * match_parm() does parsing for ide_setup():
1097  *
1098  * 1. the first char of s must be '='.
1099  * 2. if the remainder matches one of the supplied keywords,
1100  *     the index (1 based) of the keyword is negated and returned.
1101  * 3. if the remainder is a series of no more than max_vals numbers
1102  *     separated by commas, the numbers are saved in vals[] and a
1103  *     count of how many were saved is returned.  Base10 is assumed,
1104  *     and base16 is allowed when prefixed with "0x".
1105  * 4. otherwise, zero is returned.
1106  */
1107 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1108 {
1109         static const char *decimal = "0123456789";
1110         static const char *hex = "0123456789abcdef";
1111         int i, n;
1112
1113         if (*s++ == '=') {
1114                 /*
1115                  * Try matching against the supplied keywords,
1116                  * and return -(index+1) if we match one
1117                  */
1118                 if (keywords != NULL) {
1119                         for (i = 0; *keywords != NULL; ++i) {
1120                                 if (!strcmp(s, *keywords++))
1121                                         return -(i+1);
1122                         }
1123                 }
1124                 /*
1125                  * Look for a series of no more than "max_vals"
1126                  * numeric values separated by commas, in base10,
1127                  * or base16 when prefixed with "0x".
1128                  * Return a count of how many were found.
1129                  */
1130                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1131                         vals[n] = i;
1132                         while ((i = stridx(decimal, *++s)) >= 0)
1133                                 vals[n] = (vals[n] * 10) + i;
1134                         if (*s == 'x' && !vals[n]) {
1135                                 while ((i = stridx(hex, *++s)) >= 0)
1136                                         vals[n] = (vals[n] * 0x10) + i;
1137                         }
1138                         if (++n == max_vals)
1139                                 break;
1140                         if (*s == ',' || *s == ';')
1141                                 ++s;
1142                 }
1143                 if (!*s)
1144                         return n;
1145         }
1146         return 0;       /* zero = nothing matched */
1147 }
1148
1149 extern int probe_ali14xx;
1150 extern int probe_umc8672;
1151 extern int probe_dtc2278;
1152 extern int probe_ht6560b;
1153 extern int probe_qd65xx;
1154 extern int cmd640_vlb;
1155
1156 static int __initdata is_chipset_set[MAX_HWIFS];
1157
1158 /*
1159  * ide_setup() gets called VERY EARLY during initialization,
1160  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1161  *
1162  * Remember to update Documentation/ide/ide.txt if you change something here.
1163  */
1164 static int __init ide_setup(char *s)
1165 {
1166         int i, vals[3];
1167         ide_hwif_t *hwif;
1168         ide_drive_t *drive;
1169         unsigned int hw, unit;
1170         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1171         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1172
1173         
1174         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1175                 return 0;                               /* driver and not us */
1176
1177         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1178                 return 0;
1179
1180         printk(KERN_INFO "ide_setup: %s", s);
1181         init_ide_data ();
1182
1183 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1184         if (!strcmp(s, "ide=doubler")) {
1185                 extern int ide_doubler;
1186
1187                 printk(" : Enabled support for IDE doublers\n");
1188                 ide_doubler = 1;
1189                 return 1;
1190         }
1191 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1192
1193         if (!strcmp(s, "ide=nodma")) {
1194                 printk(" : Prevented DMA\n");
1195                 noautodma = 1;
1196                 goto obsolete_option;
1197         }
1198
1199 #ifdef CONFIG_BLK_DEV_IDEACPI
1200         if (!strcmp(s, "ide=noacpi")) {
1201                 //printk(" : Disable IDE ACPI support.\n");
1202                 ide_noacpi = 1;
1203                 return 1;
1204         }
1205         if (!strcmp(s, "ide=acpigtf")) {
1206                 //printk(" : Enable IDE ACPI _GTF support.\n");
1207                 ide_noacpitfs = 0;
1208                 return 1;
1209         }
1210         if (!strcmp(s, "ide=acpionboot")) {
1211                 //printk(" : Call IDE ACPI methods on boot.\n");
1212                 ide_noacpionboot = 0;
1213                 return 1;
1214         }
1215 #endif /* CONFIG_BLK_DEV_IDEACPI */
1216
1217         /*
1218          * Look for drive options:  "hdx="
1219          */
1220         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1221                 const char *hd_words[] = {
1222                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1223                         "autotune", "noautotune", "-8", "-9", "-10",
1224                         "noflush", "remap", "remap63", "scsi", NULL };
1225                 unit = s[2] - 'a';
1226                 hw   = unit / MAX_DRIVES;
1227                 unit = unit % MAX_DRIVES;
1228                 hwif = &ide_hwifs[hw];
1229                 drive = &hwif->drives[unit];
1230                 if (strncmp(s + 4, "ide-", 4) == 0) {
1231                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1232                         goto obsolete_option;
1233                 }
1234                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1235                         case -1: /* "none" */
1236                         case -2: /* "noprobe" */
1237                                 drive->noprobe = 1;
1238                                 goto done;
1239                         case -3: /* "nowerr" */
1240                                 drive->bad_wstat = BAD_R_STAT;
1241                                 hwif->noprobe = 0;
1242                                 goto done;
1243                         case -4: /* "cdrom" */
1244                                 drive->present = 1;
1245                                 drive->media = ide_cdrom;
1246                                 /* an ATAPI device ignores DRDY */
1247                                 drive->ready_stat = 0;
1248                                 hwif->noprobe = 0;
1249                                 goto done;
1250                         case -5: /* nodma */
1251                                 drive->nodma = 1;
1252                                 goto done;
1253                         case -6: /* "autotune" */
1254                                 drive->autotune = IDE_TUNE_AUTO;
1255                                 goto obsolete_option;
1256                         case -7: /* "noautotune" */
1257                                 drive->autotune = IDE_TUNE_NOAUTO;
1258                                 goto obsolete_option;
1259                         case -11: /* noflush */
1260                                 drive->noflush = 1;
1261                                 goto done;
1262                         case -12: /* "remap" */
1263                                 drive->remap_0_to_1 = 1;
1264                                 goto obsolete_option;
1265                         case -13: /* "remap63" */
1266                                 drive->sect0 = 63;
1267                                 goto obsolete_option;
1268                         case -14: /* "scsi" */
1269                                 drive->scsi = 1;
1270                                 goto obsolete_option;
1271                         case 3: /* cyl,head,sect */
1272                                 drive->media    = ide_disk;
1273                                 drive->ready_stat = READY_STAT;
1274                                 drive->cyl      = drive->bios_cyl  = vals[0];
1275                                 drive->head     = drive->bios_head = vals[1];
1276                                 drive->sect     = drive->bios_sect = vals[2];
1277                                 drive->present  = 1;
1278                                 drive->forced_geom = 1;
1279                                 hwif->noprobe = 0;
1280                                 goto done;
1281                         default:
1282                                 goto bad_option;
1283                 }
1284         }
1285
1286         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1287                 goto bad_option;
1288         /*
1289          * Look for bus speed option:  "idebus="
1290          */
1291         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1292                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1293                         goto bad_option;
1294                 if (vals[0] >= 20 && vals[0] <= 66) {
1295                         idebus_parameter = vals[0];
1296                 } else
1297                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1298                 goto done;
1299         }
1300         /*
1301          * Look for interface options:  "idex="
1302          */
1303         if (s[3] >= '0' && s[3] <= max_hwif) {
1304                 /*
1305                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1306                  * (-8, -9, -10) are reserved to ease the hardcoding.
1307                  */
1308                 static const char *ide_words[] = {
1309                         "noprobe", "serialize", "minus3", "minus4",
1310                         "reset", "minus6", "ata66", "minus8", "minus9",
1311                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1312                         "dtc2278", "umc8672", "ali14xx", NULL };
1313
1314                 hw_regs_t hwregs;
1315
1316                 hw = s[3] - '0';
1317                 hwif = &ide_hwifs[hw];
1318                 i = match_parm(&s[4], ide_words, vals, 3);
1319
1320                 /*
1321                  * Cryptic check to ensure chipset not already set for hwif.
1322                  * Note: we can't depend on hwif->chipset here.
1323                  */
1324                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1325                         /* chipset already specified */
1326                         if (is_chipset_set[hw])
1327                                 goto bad_option;
1328                         if (i > -18 && i <= -11) {
1329                                 /* these drivers are for "ide0=" only */
1330                                 if (hw != 0)
1331                                         goto bad_hwif;
1332                                 /* chipset already specified for 2nd port */
1333                                 if (is_chipset_set[hw+1])
1334                                         goto bad_option;
1335                         }
1336                         is_chipset_set[hw] = 1;
1337                         printk("\n");
1338                 }
1339
1340                 switch (i) {
1341 #ifdef CONFIG_BLK_DEV_ALI14XX
1342                         case -17: /* "ali14xx" */
1343                                 probe_ali14xx = 1;
1344                                 goto obsolete_option;
1345 #endif
1346 #ifdef CONFIG_BLK_DEV_UMC8672
1347                         case -16: /* "umc8672" */
1348                                 probe_umc8672 = 1;
1349                                 goto obsolete_option;
1350 #endif
1351 #ifdef CONFIG_BLK_DEV_DTC2278
1352                         case -15: /* "dtc2278" */
1353                                 probe_dtc2278 = 1;
1354                                 goto obsolete_option;
1355 #endif
1356 #ifdef CONFIG_BLK_DEV_CMD640
1357                         case -14: /* "cmd640_vlb" */
1358                                 cmd640_vlb = 1;
1359                                 goto obsolete_option;
1360 #endif
1361 #ifdef CONFIG_BLK_DEV_HT6560B
1362                         case -13: /* "ht6560b" */
1363                                 probe_ht6560b = 1;
1364                                 goto obsolete_option;
1365 #endif
1366 #ifdef CONFIG_BLK_DEV_QD65XX
1367                         case -12: /* "qd65xx" */
1368                                 probe_qd65xx = 1;
1369                                 goto obsolete_option;
1370 #endif
1371 #ifdef CONFIG_BLK_DEV_4DRIVES
1372                         case -11: /* "four" drives on one set of ports */
1373                         {
1374                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1375                                 mate->drives[0].select.all ^= 0x20;
1376                                 mate->drives[1].select.all ^= 0x20;
1377                                 hwif->chipset = mate->chipset = ide_4drives;
1378                                 mate->irq = hwif->irq;
1379                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1380                                 hwif->mate = mate;
1381                                 mate->mate = hwif;
1382                                 hwif->serialized = mate->serialized = 1;
1383                                 goto obsolete_option;
1384                         }
1385 #endif /* CONFIG_BLK_DEV_4DRIVES */
1386                         case -10: /* minus10 */
1387                         case -9: /* minus9 */
1388                         case -8: /* minus8 */
1389                         case -6:
1390                         case -4:
1391                         case -3:
1392                                 goto bad_option;
1393                         case -7: /* ata66 */
1394 #ifdef CONFIG_BLK_DEV_IDEPCI
1395                                 /*
1396                                  * Use ATA_CBL_PATA40_SHORT so drive side
1397                                  * cable detection is also overriden.
1398                                  */
1399                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1400                                 goto obsolete_option;
1401 #else
1402                                 goto bad_hwif;
1403 #endif
1404                         case -5: /* "reset" */
1405                                 hwif->reset = 1;
1406                                 goto obsolete_option;
1407                         case -2: /* "serialize" */
1408                                 hwif->mate = &ide_hwifs[hw^1];
1409                                 hwif->mate->mate = hwif;
1410                                 hwif->serialized = hwif->mate->serialized = 1;
1411                                 goto obsolete_option;
1412
1413                         case -1: /* "noprobe" */
1414                                 hwif->noprobe = 1;
1415                                 goto obsolete_option;
1416
1417                         case 1: /* base */
1418                                 vals[1] = vals[0] + 0x206; /* default ctl */
1419                         case 2: /* base,ctl */
1420                                 vals[2] = 0;    /* default irq = probe for it */
1421                         case 3: /* base,ctl,irq */
1422                                 memset(&hwregs, 0, sizeof(hwregs));
1423                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1424                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1425                                 hwif->irq      = vals[2];
1426                                 hwif->noprobe  = 0;
1427                                 hwif->chipset  = ide_forced;
1428                                 goto obsolete_option;
1429
1430                         case 0: goto bad_option;
1431                         default:
1432                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1433                                 return 1;
1434                 }
1435         }
1436 bad_option:
1437         printk(" -- BAD OPTION\n");
1438         return 1;
1439 obsolete_option:
1440         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1441         return 1;
1442 bad_hwif:
1443         printk("-- NOT SUPPORTED ON ide%d", hw);
1444 done:
1445         printk("\n");
1446         return 1;
1447 }
1448
1449 EXPORT_SYMBOL(ide_lock);
1450
1451 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1452 {
1453         return 1;
1454 }
1455
1456 static char *media_string(ide_drive_t *drive)
1457 {
1458         switch (drive->media) {
1459         case ide_disk:
1460                 return "disk";
1461         case ide_cdrom:
1462                 return "cdrom";
1463         case ide_tape:
1464                 return "tape";
1465         case ide_floppy:
1466                 return "floppy";
1467         case ide_optical:
1468                 return "optical";
1469         default:
1470                 return "UNKNOWN";
1471         }
1472 }
1473
1474 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1475 {
1476         ide_drive_t *drive = to_ide_device(dev);
1477         return sprintf(buf, "%s\n", media_string(drive));
1478 }
1479
1480 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1481 {
1482         ide_drive_t *drive = to_ide_device(dev);
1483         return sprintf(buf, "%s\n", drive->name);
1484 }
1485
1486 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1487 {
1488         ide_drive_t *drive = to_ide_device(dev);
1489         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1490 }
1491
1492 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1493                           char *buf)
1494 {
1495         ide_drive_t *drive = to_ide_device(dev);
1496         return sprintf(buf, "%s\n", drive->id->model);
1497 }
1498
1499 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1500                              char *buf)
1501 {
1502         ide_drive_t *drive = to_ide_device(dev);
1503         return sprintf(buf, "%s\n", drive->id->fw_rev);
1504 }
1505
1506 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1507                            char *buf)
1508 {
1509         ide_drive_t *drive = to_ide_device(dev);
1510         return sprintf(buf, "%s\n", drive->id->serial_no);
1511 }
1512
1513 static struct device_attribute ide_dev_attrs[] = {
1514         __ATTR_RO(media),
1515         __ATTR_RO(drivename),
1516         __ATTR_RO(modalias),
1517         __ATTR_RO(model),
1518         __ATTR_RO(firmware),
1519         __ATTR(serial, 0400, serial_show, NULL),
1520         __ATTR_NULL
1521 };
1522
1523 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1524 {
1525         ide_drive_t *drive = to_ide_device(dev);
1526
1527         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1528         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1529         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1530         return 0;
1531 }
1532
1533 static int generic_ide_probe(struct device *dev)
1534 {
1535         ide_drive_t *drive = to_ide_device(dev);
1536         ide_driver_t *drv = to_ide_driver(dev->driver);
1537
1538         return drv->probe ? drv->probe(drive) : -ENODEV;
1539 }
1540
1541 static int generic_ide_remove(struct device *dev)
1542 {
1543         ide_drive_t *drive = to_ide_device(dev);
1544         ide_driver_t *drv = to_ide_driver(dev->driver);
1545
1546         if (drv->remove)
1547                 drv->remove(drive);
1548
1549         return 0;
1550 }
1551
1552 static void generic_ide_shutdown(struct device *dev)
1553 {
1554         ide_drive_t *drive = to_ide_device(dev);
1555         ide_driver_t *drv = to_ide_driver(dev->driver);
1556
1557         if (dev->driver && drv->shutdown)
1558                 drv->shutdown(drive);
1559 }
1560
1561 struct bus_type ide_bus_type = {
1562         .name           = "ide",
1563         .match          = ide_bus_match,
1564         .uevent         = ide_uevent,
1565         .probe          = generic_ide_probe,
1566         .remove         = generic_ide_remove,
1567         .shutdown       = generic_ide_shutdown,
1568         .dev_attrs      = ide_dev_attrs,
1569         .suspend        = generic_ide_suspend,
1570         .resume         = generic_ide_resume,
1571 };
1572
1573 EXPORT_SYMBOL_GPL(ide_bus_type);
1574
1575 /*
1576  * This is gets invoked once during initialization, to set *everything* up
1577  */
1578 static int __init ide_init(void)
1579 {
1580         int ret;
1581
1582         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1583         system_bus_speed = ide_system_bus_speed();
1584
1585         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1586                          "for PIO modes%s\n", system_bus_speed,
1587                         idebus_parameter ? "" : "; override with idebus=xx");
1588
1589         ret = bus_register(&ide_bus_type);
1590         if (ret < 0) {
1591                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1592                 return ret;
1593         }
1594
1595         init_ide_data();
1596
1597         proc_ide_create();
1598
1599         return 0;
1600 }
1601
1602 #ifdef MODULE
1603 static char *options = NULL;
1604 module_param(options, charp, 0);
1605 MODULE_LICENSE("GPL");
1606
1607 static void __init parse_options (char *line)
1608 {
1609         char *next = line;
1610
1611         if (line == NULL || !*line)
1612                 return;
1613         while ((line = next) != NULL) {
1614                 if ((next = strchr(line,' ')) != NULL)
1615                         *next++ = 0;
1616                 if (!ide_setup(line))
1617                         printk (KERN_INFO "Unknown option '%s'\n", line);
1618         }
1619 }
1620
1621 int __init init_module (void)
1622 {
1623         parse_options(options);
1624         return ide_init();
1625 }
1626
1627 void __exit cleanup_module (void)
1628 {
1629         int index;
1630
1631         for (index = 0; index < MAX_HWIFS; ++index)
1632                 ide_unregister(index, 0, 0);
1633
1634         proc_ide_destroy();
1635
1636         bus_unregister(&ide_bus_type);
1637 }
1638
1639 #else /* !MODULE */
1640
1641 __setup("", ide_setup);
1642
1643 module_init(ide_init);
1644
1645 #endif /* MODULE */