Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[linux-2.6] / 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  *
503  *      Perform the final unregister of an IDE interface. At the moment
504  *      we don't refcount interfaces so this will also get split up.
505  *
506  *      Locking:
507  *      The caller must not hold the IDE locks
508  *      The drive present/vanishing is not yet properly locked
509  *      Take care with the callbacks. These have been split to avoid
510  *      deadlocking the IDE layer. The shutdown callback is called
511  *      before we take the lock and free resources. It is up to the
512  *      caller to be sure there is no pending I/O here, and that
513  *      the interface will not be reopened (present/vanishing locking
514  *      isn't yet done BTW). After we commit to the final kill we
515  *      call the cleanup callback with the ide locks held.
516  *
517  *      Unregister restores the hwif structures to the default state.
518  *      This is raving bonkers.
519  */
520
521 void ide_unregister(unsigned int index)
522 {
523         ide_drive_t *drive;
524         ide_hwif_t *hwif, *g;
525         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
526         ide_hwgroup_t *hwgroup;
527         int irq_count = 0, unit;
528
529         BUG_ON(index >= MAX_HWIFS);
530
531         BUG_ON(in_interrupt());
532         BUG_ON(irqs_disabled());
533         mutex_lock(&ide_cfg_mtx);
534         spin_lock_irq(&ide_lock);
535         hwif = &ide_hwifs[index];
536         if (!hwif->present)
537                 goto abort;
538         for (unit = 0; unit < MAX_DRIVES; ++unit) {
539                 drive = &hwif->drives[unit];
540                 if (!drive->present)
541                         continue;
542                 spin_unlock_irq(&ide_lock);
543                 device_unregister(&drive->gendev);
544                 wait_for_completion(&drive->gendev_rel_comp);
545                 spin_lock_irq(&ide_lock);
546         }
547         hwif->present = 0;
548
549         spin_unlock_irq(&ide_lock);
550
551         ide_proc_unregister_port(hwif);
552
553         hwgroup = hwif->hwgroup;
554         /*
555          * free the irq if we were the only hwif using it
556          */
557         g = hwgroup->hwif;
558         do {
559                 if (g->irq == hwif->irq)
560                         ++irq_count;
561                 g = g->next;
562         } while (g != hwgroup->hwif);
563         if (irq_count == 1)
564                 free_irq(hwif->irq, hwgroup);
565
566         ide_remove_port_from_hwgroup(hwif);
567
568         device_unregister(&hwif->gendev);
569         wait_for_completion(&hwif->gendev_rel_comp);
570
571         /*
572          * Remove us from the kernel's knowledge
573          */
574         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
575         kfree(hwif->sg_table);
576         unregister_blkdev(hwif->major, hwif->name);
577         spin_lock_irq(&ide_lock);
578
579         if (hwif->dma_base) {
580                 (void) ide_release_dma(hwif);
581
582                 hwif->dma_base = 0;
583                 hwif->dma_command = 0;
584                 hwif->dma_vendor1 = 0;
585                 hwif->dma_status = 0;
586                 hwif->dma_vendor3 = 0;
587                 hwif->dma_prdtable = 0;
588
589                 hwif->extra_base  = 0;
590                 hwif->extra_ports = 0;
591         }
592
593         /*
594          * Note that we only release the standard ports,
595          * and do not even try to handle any extra ports
596          * allocated for weird IDE interface chipsets.
597          */
598         ide_hwif_release_regions(hwif);
599
600         /* copy original settings */
601         tmp_hwif = *hwif;
602
603         /* restore hwif data to pristine status */
604         ide_init_port_data(hwif, index);
605         init_hwif_default(hwif, index);
606
607         ide_hwif_restore(hwif, &tmp_hwif);
608
609 abort:
610         spin_unlock_irq(&ide_lock);
611         mutex_unlock(&ide_cfg_mtx);
612 }
613
614 EXPORT_SYMBOL(ide_unregister);
615
616
617 /**
618  *      ide_setup_ports         -       set up IDE interface ports
619  *      @hw: register descriptions
620  *      @base: base register
621  *      @offsets: table of register offsets
622  *      @ctrl: control register
623  *      @ack_irq: IRQ ack
624  *      @irq: interrupt lie
625  *
626  *      Setup hw_regs_t structure described by parameters.  You
627  *      may set up the hw structure yourself OR use this routine to
628  *      do it for you. This is basically a helper
629  *
630  */
631  
632 void ide_setup_ports (  hw_regs_t *hw,
633                         unsigned long base, int *offsets,
634                         unsigned long ctrl, unsigned long intr,
635                         ide_ack_intr_t *ack_intr,
636 /*
637  *                      ide_io_ops_t *iops,
638  */
639                         int irq)
640 {
641         int i;
642
643         memset(hw, 0, sizeof(hw_regs_t));
644         for (i = 0; i < IDE_NR_PORTS; i++) {
645                 if (offsets[i] == -1) {
646                         switch(i) {
647                                 case IDE_CONTROL_OFFSET:
648                                         hw->io_ports[i] = ctrl;
649                                         break;
650 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
651                                 case IDE_IRQ_OFFSET:
652                                         hw->io_ports[i] = intr;
653                                         break;
654 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
655                                 default:
656                                         hw->io_ports[i] = 0;
657                                         break;
658                         }
659                 } else {
660                         hw->io_ports[i] = base + offsets[i];
661                 }
662         }
663         hw->irq = irq;
664         hw->ack_intr = ack_intr;
665 /*
666  *      hw->iops = iops;
667  */
668 }
669
670 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
671 {
672         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
673         hwif->irq = hw->irq;
674         hwif->noprobe = 0;
675         hwif->chipset = hw->chipset;
676         hwif->gendev.parent = hw->dev;
677         hwif->ack_intr = hw->ack_intr;
678 }
679 EXPORT_SYMBOL_GPL(ide_init_port_hw);
680
681 /**
682  *      ide_register_hw         -       register IDE interface
683  *      @hw: hardware registers
684  *      @quirkproc: quirkproc function
685  *      @hwifp: pointer to returned hwif
686  *
687  *      Register an IDE interface, specifying exactly the registers etc.
688  *
689  *      Returns -1 on error.
690  */
691
692 int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
693                     ide_hwif_t **hwifp)
694 {
695         int index, retry = 1;
696         ide_hwif_t *hwif;
697         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
698
699         do {
700                 for (index = 0; index < MAX_HWIFS; ++index) {
701                         hwif = &ide_hwifs[index];
702                         if (hwif->io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
703                                 goto found;
704                 }
705                 for (index = 0; index < MAX_HWIFS; ++index) {
706                         hwif = &ide_hwifs[index];
707                         if (hwif->hold)
708                                 continue;
709                         if (!hwif->present && hwif->mate == NULL)
710                                 goto found;
711                 }
712                 for (index = 0; index < MAX_HWIFS; index++)
713                         ide_unregister(index);
714         } while (retry--);
715         return -1;
716 found:
717         if (hwif->present)
718                 ide_unregister(index);
719         else if (!hwif->hold) {
720                 ide_init_port_data(hwif, index);
721                 init_hwif_default(hwif, index);
722         }
723         if (hwif->present)
724                 return -1;
725
726         ide_init_port_hw(hwif, hw);
727         hwif->quirkproc = quirkproc;
728
729         idx[0] = index;
730
731         ide_device_add(idx);
732
733         if (hwifp)
734                 *hwifp = hwif;
735
736         return hwif->present ? index : -1;
737 }
738
739 EXPORT_SYMBOL(ide_register_hw);
740
741 /*
742  *      Locks for IDE setting functionality
743  */
744
745 DEFINE_MUTEX(ide_setting_mtx);
746
747 EXPORT_SYMBOL_GPL(ide_setting_mtx);
748
749 /**
750  *      ide_spin_wait_hwgroup   -       wait for group
751  *      @drive: drive in the group
752  *
753  *      Wait for an IDE device group to go non busy and then return
754  *      holding the ide_lock which guards the hwgroup->busy status
755  *      and right to use it.
756  */
757
758 int ide_spin_wait_hwgroup (ide_drive_t *drive)
759 {
760         ide_hwgroup_t *hwgroup = HWGROUP(drive);
761         unsigned long timeout = jiffies + (3 * HZ);
762
763         spin_lock_irq(&ide_lock);
764
765         while (hwgroup->busy) {
766                 unsigned long lflags;
767                 spin_unlock_irq(&ide_lock);
768                 local_irq_set(lflags);
769                 if (time_after(jiffies, timeout)) {
770                         local_irq_restore(lflags);
771                         printk(KERN_ERR "%s: channel busy\n", drive->name);
772                         return -EBUSY;
773                 }
774                 local_irq_restore(lflags);
775                 spin_lock_irq(&ide_lock);
776         }
777         return 0;
778 }
779
780 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
781
782 int set_io_32bit(ide_drive_t *drive, int arg)
783 {
784         if (drive->no_io_32bit)
785                 return -EPERM;
786
787         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
788                 return -EINVAL;
789
790         if (ide_spin_wait_hwgroup(drive))
791                 return -EBUSY;
792
793         drive->io_32bit = arg;
794 #ifdef CONFIG_BLK_DEV_DTC2278
795         if (HWIF(drive)->chipset == ide_dtc2278)
796                 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
797 #endif /* CONFIG_BLK_DEV_DTC2278 */
798
799         spin_unlock_irq(&ide_lock);
800
801         return 0;
802 }
803
804 static int set_ksettings(ide_drive_t *drive, int arg)
805 {
806         if (arg < 0 || arg > 1)
807                 return -EINVAL;
808
809         if (ide_spin_wait_hwgroup(drive))
810                 return -EBUSY;
811         drive->keep_settings = arg;
812         spin_unlock_irq(&ide_lock);
813
814         return 0;
815 }
816
817 int set_using_dma(ide_drive_t *drive, int arg)
818 {
819 #ifdef CONFIG_BLK_DEV_IDEDMA
820         ide_hwif_t *hwif = drive->hwif;
821         int err = -EPERM;
822
823         if (arg < 0 || arg > 1)
824                 return -EINVAL;
825
826         if (!drive->id || !(drive->id->capability & 1))
827                 goto out;
828
829         if (hwif->dma_host_set == NULL)
830                 goto out;
831
832         err = -EBUSY;
833         if (ide_spin_wait_hwgroup(drive))
834                 goto out;
835         /*
836          * set ->busy flag, unlock and let it ride
837          */
838         hwif->hwgroup->busy = 1;
839         spin_unlock_irq(&ide_lock);
840
841         err = 0;
842
843         if (arg) {
844                 if (ide_set_dma(drive))
845                         err = -EIO;
846         } else
847                 ide_dma_off(drive);
848
849         /*
850          * lock, clear ->busy flag and unlock before leaving
851          */
852         spin_lock_irq(&ide_lock);
853         hwif->hwgroup->busy = 0;
854         spin_unlock_irq(&ide_lock);
855 out:
856         return err;
857 #else
858         if (arg < 0 || arg > 1)
859                 return -EINVAL;
860
861         return -EPERM;
862 #endif
863 }
864
865 int set_pio_mode(ide_drive_t *drive, int arg)
866 {
867         struct request rq;
868
869         if (arg < 0 || arg > 255)
870                 return -EINVAL;
871
872         if (drive->hwif->set_pio_mode == NULL)
873                 return -ENOSYS;
874
875         if (drive->special.b.set_tune)
876                 return -EBUSY;
877
878         ide_init_drive_cmd(&rq);
879         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
880
881         drive->tune_req = (u8) arg;
882         drive->special.b.set_tune = 1;
883         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
884         return 0;
885 }
886
887 static int set_unmaskirq(ide_drive_t *drive, int arg)
888 {
889         if (drive->no_unmask)
890                 return -EPERM;
891
892         if (arg < 0 || arg > 1)
893                 return -EINVAL;
894
895         if (ide_spin_wait_hwgroup(drive))
896                 return -EBUSY;
897         drive->unmask = arg;
898         spin_unlock_irq(&ide_lock);
899
900         return 0;
901 }
902
903 /**
904  *      system_bus_clock        -       clock guess
905  *
906  *      External version of the bus clock guess used by very old IDE drivers
907  *      for things like VLB timings. Should not be used.
908  */
909
910 int system_bus_clock (void)
911 {
912         return system_bus_speed;
913 }
914
915 EXPORT_SYMBOL(system_bus_clock);
916
917 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
918 {
919         ide_drive_t *drive = dev->driver_data;
920         ide_hwif_t *hwif = HWIF(drive);
921         struct request rq;
922         struct request_pm_state rqpm;
923         ide_task_t args;
924         int ret;
925
926         /* Call ACPI _GTM only once */
927         if (!(drive->dn % 2))
928                 ide_acpi_get_timing(hwif);
929
930         memset(&rq, 0, sizeof(rq));
931         memset(&rqpm, 0, sizeof(rqpm));
932         memset(&args, 0, sizeof(args));
933         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
934         rq.special = &args;
935         rq.data = &rqpm;
936         rqpm.pm_step = ide_pm_state_start_suspend;
937         if (mesg.event == PM_EVENT_PRETHAW)
938                 mesg.event = PM_EVENT_FREEZE;
939         rqpm.pm_state = mesg.event;
940
941         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
942         /* only call ACPI _PS3 after both drivers are suspended */
943         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
944                  && hwif->drives[1].present)
945                  || !hwif->drives[0].present
946                  || !hwif->drives[1].present))
947                 ide_acpi_set_state(hwif, 0);
948         return ret;
949 }
950
951 static int generic_ide_resume(struct device *dev)
952 {
953         ide_drive_t *drive = dev->driver_data;
954         ide_hwif_t *hwif = HWIF(drive);
955         struct request rq;
956         struct request_pm_state rqpm;
957         ide_task_t args;
958         int err;
959
960         /* Call ACPI _STM only once */
961         if (!(drive->dn % 2)) {
962                 ide_acpi_set_state(hwif, 1);
963                 ide_acpi_push_timing(hwif);
964         }
965
966         ide_acpi_exec_tfs(drive);
967
968         memset(&rq, 0, sizeof(rq));
969         memset(&rqpm, 0, sizeof(rqpm));
970         memset(&args, 0, sizeof(args));
971         rq.cmd_type = REQ_TYPE_PM_RESUME;
972         rq.special = &args;
973         rq.data = &rqpm;
974         rqpm.pm_step = ide_pm_state_start_resume;
975         rqpm.pm_state = PM_EVENT_ON;
976
977         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
978
979         if (err == 0 && dev->driver) {
980                 ide_driver_t *drv = to_ide_driver(dev->driver);
981
982                 if (drv->resume)
983                         drv->resume(drive);
984         }
985
986         return err;
987 }
988
989 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
990                         unsigned int cmd, unsigned long arg)
991 {
992         unsigned long flags;
993         ide_driver_t *drv;
994         void __user *p = (void __user *)arg;
995         int err = 0, (*setfunc)(ide_drive_t *, int);
996         u8 *val;
997
998         switch (cmd) {
999         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
1000         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
1001         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
1002         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
1003         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
1004         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
1005         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
1006         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
1007         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
1008         }
1009
1010         switch (cmd) {
1011                 case HDIO_OBSOLETE_IDENTITY:
1012                 case HDIO_GET_IDENTITY:
1013                         if (bdev != bdev->bd_contains)
1014                                 return -EINVAL;
1015                         if (drive->id_read == 0)
1016                                 return -ENOMSG;
1017                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1018                                 return -EFAULT;
1019                         return 0;
1020
1021                 case HDIO_GET_NICE:
1022                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1023                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1024                                         drive->nice0            <<      IDE_NICE_0              |
1025                                         drive->nice1            <<      IDE_NICE_1              |
1026                                         drive->nice2            <<      IDE_NICE_2,
1027                                         (long __user *) arg);
1028
1029 #ifdef CONFIG_IDE_TASK_IOCTL
1030                 case HDIO_DRIVE_TASKFILE:
1031                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1032                                 return -EACCES;
1033                         switch(drive->media) {
1034                                 case ide_disk:
1035                                         return ide_taskfile_ioctl(drive, cmd, arg);
1036                                 default:
1037                                         return -ENOMSG;
1038                         }
1039 #endif /* CONFIG_IDE_TASK_IOCTL */
1040
1041                 case HDIO_DRIVE_CMD:
1042                         if (!capable(CAP_SYS_RAWIO))
1043                                 return -EACCES;
1044                         return ide_cmd_ioctl(drive, cmd, arg);
1045
1046                 case HDIO_DRIVE_TASK:
1047                         if (!capable(CAP_SYS_RAWIO))
1048                                 return -EACCES;
1049                         return ide_task_ioctl(drive, cmd, arg);
1050
1051                 case HDIO_SCAN_HWIF:
1052                 {
1053                         hw_regs_t hw;
1054                         int args[3];
1055                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1056                         if (copy_from_user(args, p, 3 * sizeof(int)))
1057                                 return -EFAULT;
1058                         memset(&hw, 0, sizeof(hw));
1059                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1060                                             (unsigned long) args[1], NULL);
1061                         hw.irq = args[2];
1062                         if (ide_register_hw(&hw, NULL, NULL) == -1)
1063                                 return -EIO;
1064                         return 0;
1065                 }
1066                 case HDIO_UNREGISTER_HWIF:
1067                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1068                         /* (arg > MAX_HWIFS) checked in function */
1069                         ide_unregister(arg);
1070                         return 0;
1071                 case HDIO_SET_NICE:
1072                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1073                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1074                                 return -EPERM;
1075                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1076                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1077                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1078                                 drive->dsc_overlap = 0;
1079                                 return -EPERM;
1080                         }
1081                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1082                         return 0;
1083                 case HDIO_DRIVE_RESET:
1084                 {
1085                         unsigned long flags;
1086                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1087                         
1088                         /*
1089                          *      Abort the current command on the
1090                          *      group if there is one, taking
1091                          *      care not to allow anything else
1092                          *      to be queued and to die on the
1093                          *      spot if we miss one somehow
1094                          */
1095
1096                         spin_lock_irqsave(&ide_lock, flags);
1097
1098                         if (HWGROUP(drive)->resetting) {
1099                                 spin_unlock_irqrestore(&ide_lock, flags);
1100                                 return -EBUSY;
1101                         }
1102
1103                         ide_abort(drive, "drive reset");
1104
1105                         BUG_ON(HWGROUP(drive)->handler);
1106                                 
1107                         /* Ensure nothing gets queued after we
1108                            drop the lock. Reset will clear the busy */
1109                    
1110                         HWGROUP(drive)->busy = 1;
1111                         spin_unlock_irqrestore(&ide_lock, flags);
1112                         (void) ide_do_reset(drive);
1113
1114                         return 0;
1115                 }
1116
1117                 case HDIO_GET_BUSSTATE:
1118                         if (!capable(CAP_SYS_ADMIN))
1119                                 return -EACCES;
1120                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1121                                 return -EFAULT;
1122                         return 0;
1123
1124                 case HDIO_SET_BUSSTATE:
1125                         if (!capable(CAP_SYS_ADMIN))
1126                                 return -EACCES;
1127                         if (HWIF(drive)->busproc)
1128                                 return HWIF(drive)->busproc(drive, (int)arg);
1129                         return -EOPNOTSUPP;
1130                 default:
1131                         return -EINVAL;
1132         }
1133
1134 read_val:
1135         mutex_lock(&ide_setting_mtx);
1136         spin_lock_irqsave(&ide_lock, flags);
1137         err = *val;
1138         spin_unlock_irqrestore(&ide_lock, flags);
1139         mutex_unlock(&ide_setting_mtx);
1140         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1141
1142 set_val:
1143         if (bdev != bdev->bd_contains)
1144                 err = -EINVAL;
1145         else {
1146                 if (!capable(CAP_SYS_ADMIN))
1147                         err = -EACCES;
1148                 else {
1149                         mutex_lock(&ide_setting_mtx);
1150                         err = setfunc(drive, arg);
1151                         mutex_unlock(&ide_setting_mtx);
1152                 }
1153         }
1154         return err;
1155 }
1156
1157 EXPORT_SYMBOL(generic_ide_ioctl);
1158
1159 /*
1160  * stridx() returns the offset of c within s,
1161  * or -1 if c is '\0' or not found within s.
1162  */
1163 static int __init stridx (const char *s, char c)
1164 {
1165         char *i = strchr(s, c);
1166         return (i && c) ? i - s : -1;
1167 }
1168
1169 /*
1170  * match_parm() does parsing for ide_setup():
1171  *
1172  * 1. the first char of s must be '='.
1173  * 2. if the remainder matches one of the supplied keywords,
1174  *     the index (1 based) of the keyword is negated and returned.
1175  * 3. if the remainder is a series of no more than max_vals numbers
1176  *     separated by commas, the numbers are saved in vals[] and a
1177  *     count of how many were saved is returned.  Base10 is assumed,
1178  *     and base16 is allowed when prefixed with "0x".
1179  * 4. otherwise, zero is returned.
1180  */
1181 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1182 {
1183         static const char *decimal = "0123456789";
1184         static const char *hex = "0123456789abcdef";
1185         int i, n;
1186
1187         if (*s++ == '=') {
1188                 /*
1189                  * Try matching against the supplied keywords,
1190                  * and return -(index+1) if we match one
1191                  */
1192                 if (keywords != NULL) {
1193                         for (i = 0; *keywords != NULL; ++i) {
1194                                 if (!strcmp(s, *keywords++))
1195                                         return -(i+1);
1196                         }
1197                 }
1198                 /*
1199                  * Look for a series of no more than "max_vals"
1200                  * numeric values separated by commas, in base10,
1201                  * or base16 when prefixed with "0x".
1202                  * Return a count of how many were found.
1203                  */
1204                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1205                         vals[n] = i;
1206                         while ((i = stridx(decimal, *++s)) >= 0)
1207                                 vals[n] = (vals[n] * 10) + i;
1208                         if (*s == 'x' && !vals[n]) {
1209                                 while ((i = stridx(hex, *++s)) >= 0)
1210                                         vals[n] = (vals[n] * 0x10) + i;
1211                         }
1212                         if (++n == max_vals)
1213                                 break;
1214                         if (*s == ',' || *s == ';')
1215                                 ++s;
1216                 }
1217                 if (!*s)
1218                         return n;
1219         }
1220         return 0;       /* zero = nothing matched */
1221 }
1222
1223 extern int probe_ali14xx;
1224 extern int probe_umc8672;
1225 extern int probe_dtc2278;
1226 extern int probe_ht6560b;
1227 extern int probe_qd65xx;
1228 extern int cmd640_vlb;
1229
1230 static int __initdata is_chipset_set[MAX_HWIFS];
1231
1232 /*
1233  * ide_setup() gets called VERY EARLY during initialization,
1234  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1235  *
1236  * Remember to update Documentation/ide.txt if you change something here.
1237  */
1238 static int __init ide_setup(char *s)
1239 {
1240         int i, vals[3];
1241         ide_hwif_t *hwif;
1242         ide_drive_t *drive;
1243         unsigned int hw, unit;
1244         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1245         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1246
1247         
1248         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1249                 return 0;                               /* driver and not us */
1250
1251         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1252                 return 0;
1253
1254         printk(KERN_INFO "ide_setup: %s", s);
1255         init_ide_data ();
1256
1257 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1258         if (!strcmp(s, "ide=doubler")) {
1259                 extern int ide_doubler;
1260
1261                 printk(" : Enabled support for IDE doublers\n");
1262                 ide_doubler = 1;
1263                 return 1;
1264         }
1265 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1266
1267         if (!strcmp(s, "ide=nodma")) {
1268                 printk(" : Prevented DMA\n");
1269                 noautodma = 1;
1270                 goto obsolete_option;
1271         }
1272
1273 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1274         if (!strcmp(s, "ide=reverse")) {
1275                 ide_scan_direction = 1;
1276                 printk(" : Enabled support for IDE inverse scan order.\n");
1277                 return 1;
1278         }
1279 #endif
1280
1281 #ifdef CONFIG_BLK_DEV_IDEACPI
1282         if (!strcmp(s, "ide=noacpi")) {
1283                 //printk(" : Disable IDE ACPI support.\n");
1284                 ide_noacpi = 1;
1285                 return 1;
1286         }
1287         if (!strcmp(s, "ide=acpigtf")) {
1288                 //printk(" : Enable IDE ACPI _GTF support.\n");
1289                 ide_noacpitfs = 0;
1290                 return 1;
1291         }
1292         if (!strcmp(s, "ide=acpionboot")) {
1293                 //printk(" : Call IDE ACPI methods on boot.\n");
1294                 ide_noacpionboot = 0;
1295                 return 1;
1296         }
1297 #endif /* CONFIG_BLK_DEV_IDEACPI */
1298
1299         /*
1300          * Look for drive options:  "hdx="
1301          */
1302         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1303                 const char *hd_words[] = {
1304                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1305                         "autotune", "noautotune", "-8", "-9", "-10",
1306                         "noflush", "remap", "remap63", "scsi", NULL };
1307                 unit = s[2] - 'a';
1308                 hw   = unit / MAX_DRIVES;
1309                 unit = unit % MAX_DRIVES;
1310                 hwif = &ide_hwifs[hw];
1311                 drive = &hwif->drives[unit];
1312                 if (strncmp(s + 4, "ide-", 4) == 0) {
1313                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1314                         goto done;
1315                 }
1316                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1317                         case -1: /* "none" */
1318                         case -2: /* "noprobe" */
1319                                 drive->noprobe = 1;
1320                                 goto done;
1321                         case -3: /* "nowerr" */
1322                                 drive->bad_wstat = BAD_R_STAT;
1323                                 hwif->noprobe = 0;
1324                                 goto done;
1325                         case -4: /* "cdrom" */
1326                                 drive->present = 1;
1327                                 drive->media = ide_cdrom;
1328                                 /* an ATAPI device ignores DRDY */
1329                                 drive->ready_stat = 0;
1330                                 hwif->noprobe = 0;
1331                                 goto done;
1332                         case -5: /* nodma */
1333                                 drive->nodma = 1;
1334                                 goto done;
1335                         case -6: /* "autotune" */
1336                                 drive->autotune = IDE_TUNE_AUTO;
1337                                 goto obsolete_option;
1338                         case -7: /* "noautotune" */
1339                                 drive->autotune = IDE_TUNE_NOAUTO;
1340                                 goto obsolete_option;
1341                         case -11: /* noflush */
1342                                 drive->noflush = 1;
1343                                 goto done;
1344                         case -12: /* "remap" */
1345                                 drive->remap_0_to_1 = 1;
1346                                 goto done;
1347                         case -13: /* "remap63" */
1348                                 drive->sect0 = 63;
1349                                 goto done;
1350                         case -14: /* "scsi" */
1351                                 drive->scsi = 1;
1352                                 goto done;
1353                         case 3: /* cyl,head,sect */
1354                                 drive->media    = ide_disk;
1355                                 drive->ready_stat = READY_STAT;
1356                                 drive->cyl      = drive->bios_cyl  = vals[0];
1357                                 drive->head     = drive->bios_head = vals[1];
1358                                 drive->sect     = drive->bios_sect = vals[2];
1359                                 drive->present  = 1;
1360                                 drive->forced_geom = 1;
1361                                 hwif->noprobe = 0;
1362                                 goto done;
1363                         default:
1364                                 goto bad_option;
1365                 }
1366         }
1367
1368         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1369                 goto bad_option;
1370         /*
1371          * Look for bus speed option:  "idebus="
1372          */
1373         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1374                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1375                         goto bad_option;
1376                 if (vals[0] >= 20 && vals[0] <= 66) {
1377                         idebus_parameter = vals[0];
1378                 } else
1379                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1380                 goto done;
1381         }
1382         /*
1383          * Look for interface options:  "idex="
1384          */
1385         if (s[3] >= '0' && s[3] <= max_hwif) {
1386                 /*
1387                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1388                  * (-8, -9, -10) are reserved to ease the hardcoding.
1389                  */
1390                 static const char *ide_words[] = {
1391                         "noprobe", "serialize", "minus3", "minus4",
1392                         "reset", "minus6", "ata66", "minus8", "minus9",
1393                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1394                         "dtc2278", "umc8672", "ali14xx", NULL };
1395
1396                 hw_regs_t hwregs;
1397
1398                 hw = s[3] - '0';
1399                 hwif = &ide_hwifs[hw];
1400                 i = match_parm(&s[4], ide_words, vals, 3);
1401
1402                 /*
1403                  * Cryptic check to ensure chipset not already set for hwif.
1404                  * Note: we can't depend on hwif->chipset here.
1405                  */
1406                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1407                         /* chipset already specified */
1408                         if (is_chipset_set[hw])
1409                                 goto bad_option;
1410                         if (i > -18 && i <= -11) {
1411                                 /* these drivers are for "ide0=" only */
1412                                 if (hw != 0)
1413                                         goto bad_hwif;
1414                                 /* chipset already specified for 2nd port */
1415                                 if (is_chipset_set[hw+1])
1416                                         goto bad_option;
1417                         }
1418                         is_chipset_set[hw] = 1;
1419                         printk("\n");
1420                 }
1421
1422                 switch (i) {
1423 #ifdef CONFIG_BLK_DEV_ALI14XX
1424                         case -17: /* "ali14xx" */
1425                                 probe_ali14xx = 1;
1426                                 goto done;
1427 #endif
1428 #ifdef CONFIG_BLK_DEV_UMC8672
1429                         case -16: /* "umc8672" */
1430                                 probe_umc8672 = 1;
1431                                 goto done;
1432 #endif
1433 #ifdef CONFIG_BLK_DEV_DTC2278
1434                         case -15: /* "dtc2278" */
1435                                 probe_dtc2278 = 1;
1436                                 goto done;
1437 #endif
1438 #ifdef CONFIG_BLK_DEV_CMD640
1439                         case -14: /* "cmd640_vlb" */
1440                                 cmd640_vlb = 1;
1441                                 goto done;
1442 #endif
1443 #ifdef CONFIG_BLK_DEV_HT6560B
1444                         case -13: /* "ht6560b" */
1445                                 probe_ht6560b = 1;
1446                                 goto done;
1447 #endif
1448 #ifdef CONFIG_BLK_DEV_QD65XX
1449                         case -12: /* "qd65xx" */
1450                                 probe_qd65xx = 1;
1451                                 goto done;
1452 #endif
1453 #ifdef CONFIG_BLK_DEV_4DRIVES
1454                         case -11: /* "four" drives on one set of ports */
1455                         {
1456                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1457                                 mate->drives[0].select.all ^= 0x20;
1458                                 mate->drives[1].select.all ^= 0x20;
1459                                 hwif->chipset = mate->chipset = ide_4drives;
1460                                 mate->irq = hwif->irq;
1461                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1462                                 hwif->mate = mate;
1463                                 mate->mate = hwif;
1464                                 hwif->serialized = mate->serialized = 1;
1465                                 goto obsolete_option;
1466                         }
1467 #endif /* CONFIG_BLK_DEV_4DRIVES */
1468                         case -10: /* minus10 */
1469                         case -9: /* minus9 */
1470                         case -8: /* minus8 */
1471                         case -6:
1472                         case -4:
1473                         case -3:
1474                                 goto bad_option;
1475                         case -7: /* ata66 */
1476 #ifdef CONFIG_BLK_DEV_IDEPCI
1477                                 /*
1478                                  * Use ATA_CBL_PATA40_SHORT so drive side
1479                                  * cable detection is also overriden.
1480                                  */
1481                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1482                                 goto obsolete_option;
1483 #else
1484                                 goto bad_hwif;
1485 #endif
1486                         case -5: /* "reset" */
1487                                 hwif->reset = 1;
1488                                 goto obsolete_option;
1489                         case -2: /* "serialize" */
1490                                 hwif->mate = &ide_hwifs[hw^1];
1491                                 hwif->mate->mate = hwif;
1492                                 hwif->serialized = hwif->mate->serialized = 1;
1493                                 goto obsolete_option;
1494
1495                         case -1: /* "noprobe" */
1496                                 hwif->noprobe = 1;
1497                                 goto done;
1498
1499                         case 1: /* base */
1500                                 vals[1] = vals[0] + 0x206; /* default ctl */
1501                         case 2: /* base,ctl */
1502                                 vals[2] = 0;    /* default irq = probe for it */
1503                         case 3: /* base,ctl,irq */
1504                                 memset(&hwregs, 0, sizeof(hwregs));
1505                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1506                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1507                                 hwif->irq      = vals[2];
1508                                 hwif->noprobe  = 0;
1509                                 hwif->chipset  = ide_forced;
1510                                 goto obsolete_option;
1511
1512                         case 0: goto bad_option;
1513                         default:
1514                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1515                                 return 1;
1516                 }
1517         }
1518 bad_option:
1519         printk(" -- BAD OPTION\n");
1520         return 1;
1521 obsolete_option:
1522         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1523         return 1;
1524 bad_hwif:
1525         printk("-- NOT SUPPORTED ON ide%d", hw);
1526 done:
1527         printk("\n");
1528         return 1;
1529 }
1530
1531 EXPORT_SYMBOL(ide_lock);
1532
1533 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1534 {
1535         return 1;
1536 }
1537
1538 static char *media_string(ide_drive_t *drive)
1539 {
1540         switch (drive->media) {
1541         case ide_disk:
1542                 return "disk";
1543         case ide_cdrom:
1544                 return "cdrom";
1545         case ide_tape:
1546                 return "tape";
1547         case ide_floppy:
1548                 return "floppy";
1549         case ide_optical:
1550                 return "optical";
1551         default:
1552                 return "UNKNOWN";
1553         }
1554 }
1555
1556 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1557 {
1558         ide_drive_t *drive = to_ide_device(dev);
1559         return sprintf(buf, "%s\n", media_string(drive));
1560 }
1561
1562 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1563 {
1564         ide_drive_t *drive = to_ide_device(dev);
1565         return sprintf(buf, "%s\n", drive->name);
1566 }
1567
1568 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1569 {
1570         ide_drive_t *drive = to_ide_device(dev);
1571         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1572 }
1573
1574 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1575                           char *buf)
1576 {
1577         ide_drive_t *drive = to_ide_device(dev);
1578         return sprintf(buf, "%s\n", drive->id->model);
1579 }
1580
1581 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1582                              char *buf)
1583 {
1584         ide_drive_t *drive = to_ide_device(dev);
1585         return sprintf(buf, "%s\n", drive->id->fw_rev);
1586 }
1587
1588 static ssize_t serial_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->serial_no);
1593 }
1594
1595 static struct device_attribute ide_dev_attrs[] = {
1596         __ATTR_RO(media),
1597         __ATTR_RO(drivename),
1598         __ATTR_RO(modalias),
1599         __ATTR_RO(model),
1600         __ATTR_RO(firmware),
1601         __ATTR(serial, 0400, serial_show, NULL),
1602         __ATTR_NULL
1603 };
1604
1605 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1606 {
1607         ide_drive_t *drive = to_ide_device(dev);
1608
1609         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1610         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1611         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1612         return 0;
1613 }
1614
1615 static int generic_ide_probe(struct device *dev)
1616 {
1617         ide_drive_t *drive = to_ide_device(dev);
1618         ide_driver_t *drv = to_ide_driver(dev->driver);
1619
1620         return drv->probe ? drv->probe(drive) : -ENODEV;
1621 }
1622
1623 static int generic_ide_remove(struct device *dev)
1624 {
1625         ide_drive_t *drive = to_ide_device(dev);
1626         ide_driver_t *drv = to_ide_driver(dev->driver);
1627
1628         if (drv->remove)
1629                 drv->remove(drive);
1630
1631         return 0;
1632 }
1633
1634 static void generic_ide_shutdown(struct device *dev)
1635 {
1636         ide_drive_t *drive = to_ide_device(dev);
1637         ide_driver_t *drv = to_ide_driver(dev->driver);
1638
1639         if (dev->driver && drv->shutdown)
1640                 drv->shutdown(drive);
1641 }
1642
1643 struct bus_type ide_bus_type = {
1644         .name           = "ide",
1645         .match          = ide_bus_match,
1646         .uevent         = ide_uevent,
1647         .probe          = generic_ide_probe,
1648         .remove         = generic_ide_remove,
1649         .shutdown       = generic_ide_shutdown,
1650         .dev_attrs      = ide_dev_attrs,
1651         .suspend        = generic_ide_suspend,
1652         .resume         = generic_ide_resume,
1653 };
1654
1655 EXPORT_SYMBOL_GPL(ide_bus_type);
1656
1657 /*
1658  * This is gets invoked once during initialization, to set *everything* up
1659  */
1660 static int __init ide_init(void)
1661 {
1662         int ret;
1663
1664         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1665         system_bus_speed = ide_system_bus_speed();
1666
1667         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1668                          "for PIO modes%s\n", system_bus_speed,
1669                         idebus_parameter ? "" : "; override with idebus=xx");
1670
1671         ret = bus_register(&ide_bus_type);
1672         if (ret < 0) {
1673                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1674                 return ret;
1675         }
1676
1677         init_ide_data();
1678
1679         proc_ide_create();
1680
1681         return 0;
1682 }
1683
1684 #ifdef MODULE
1685 static char *options = NULL;
1686 module_param(options, charp, 0);
1687 MODULE_LICENSE("GPL");
1688
1689 static void __init parse_options (char *line)
1690 {
1691         char *next = line;
1692
1693         if (line == NULL || !*line)
1694                 return;
1695         while ((line = next) != NULL) {
1696                 if ((next = strchr(line,' ')) != NULL)
1697                         *next++ = 0;
1698                 if (!ide_setup(line))
1699                         printk (KERN_INFO "Unknown option '%s'\n", line);
1700         }
1701 }
1702
1703 int __init init_module (void)
1704 {
1705         parse_options(options);
1706         return ide_init();
1707 }
1708
1709 void __exit cleanup_module (void)
1710 {
1711         int index;
1712
1713         for (index = 0; index < MAX_HWIFS; ++index)
1714                 ide_unregister(index);
1715
1716         proc_ide_destroy();
1717
1718         bus_unregister(&ide_bus_type);
1719 }
1720
1721 #else /* !MODULE */
1722
1723 __setup("", ide_setup);
1724
1725 module_init(ide_init);
1726
1727 #endif /* MODULE */