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1.1 root 1: /*
2: * linux/drivers/block/ide.c Version 5.28 Feb 11, 1996
3: *
4: * Copyright (C) 1994-1996 Linus Torvalds & authors (see below)
5: */
6: #define _IDE_C /* needed by <linux/blk.h> */
7:
8: /*
9: * This is the multiple IDE interface driver, as evolved from hd.c.
10: * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
11: * There can be up to two drives per interface, as per the ATA-2 spec.
12: *
13: * Primary i/f: ide0: major=3; (hda) minor=0; (hdb) minor=64
14: * Secondary i/f: ide1: major=22; (hdc or hd1a) minor=0; (hdd or hd1b) minor=64
15: * Tertiary i/f: ide2: major=33; (hde) minor=0; (hdf) minor=64
16: * Quaternary i/f: ide3: major=34; (hdg) minor=0; (hdh) minor=64
17: *
18: * It is easy to extend ide.c to handle more than four interfaces:
19: *
20: * Change the MAX_HWIFS constant in ide.h.
21: *
22: * Define some new major numbers (in major.h), and insert them into
23: * the ide_hwif_to_major table in ide.c.
24: *
25: * Fill in the extra values for the new interfaces into the two tables
26: * inside ide.c: default_io_base[] and default_irqs[].
27: *
28: * Create the new request handlers by cloning "do_ide3_request()"
29: * for each new interface, and add them to the switch statement
30: * in the ide_init() function in ide.c.
31: *
32: * Recompile, create the new /dev/ entries, and it will probably work.
33: *
34: * From hd.c:
35: * |
36: * | It traverses the request-list, using interrupts to jump between functions.
37: * | As nearly all functions can be called within interrupts, we may not sleep.
38: * | Special care is recommended. Have Fun!
39: * |
40: * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
41: * |
42: * | Thanks to Branko Lankester, [email protected], who found a bug
43: * | in the early extended-partition checks and added DM partitions.
44: * |
45: * | Early work on error handling by Mika Liljeberg ([email protected]).
46: * |
47: * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
48: * | and general streamlining by Mark Lord ([email protected]).
49: *
50: * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
51: *
52: * Mark Lord ([email protected]) (IDE Perf.Pkg)
53: * Delman Lee ([email protected]) ("Mr. atdisk2")
54: * Petri Mattila ([email protected]) (EIDE stuff)
55: * Scott Snyder ([email protected]) (ATAPI IDE cd-rom)
56: *
57: * Maintained by Mark Lord ([email protected]): ide.c, ide.h, triton.c, hd.c, ..
58: *
59: * This was a rewrite of just about everything from hd.c, though some original
60: * code is still sprinkled about. Think of it as a major evolution, with
61: * inspiration from lots of linux users, esp. [email protected]
62: *
63: * Version 1.0 ALPHA initial code, primary i/f working okay
64: * Version 1.3 BETA dual i/f on shared irq tested & working!
65: * Version 1.4 BETA added auto probing for irq(s)
66: * Version 1.5 BETA added ALPHA (untested) support for IDE cd-roms,
67: * ...
68: * Version 3.5 correct the bios_cyl field if it's too small
69: * (linux 1.1.76) (to help fdisk with brain-dead BIOSs)
70: * Version 3.6 cosmetic corrections to comments and stuff
71: * (linux 1.1.77) reorganise probing code to make it understandable
72: * added halfway retry to probing for drive identification
73: * added "hdx=noprobe" command line option
74: * allow setting multmode even when identification fails
75: * Version 3.7 move set_geometry=1 from do_identify() to ide_init()
76: * increase DRQ_WAIT to eliminate nuisance messages
77: * wait for DRQ_STAT instead of DATA_READY during probing
78: * (courtesy of Gary Thomas [email protected])
79: * Version 3.8 fixed byte-swapping for confused Mitsumi cdrom drives
80: * update of ide-cd.c from Scott, allows blocksize=1024
81: * cdrom probe fixes, inspired by [email protected]
82: * Version 3.9 don't use LBA if lba_capacity looks funny
83: * correct the drive capacity calculations
84: * fix probing for old Seagates without IDE_ALTSTATUS_REG
85: * fix byte-ordering for some NEC cdrom drives
86: * Version 3.10 disable multiple mode by default; was causing trouble
87: * Version 3.11 fix mis-identification of old WD disks as cdroms
88: * Version 3,12 simplify logic for selecting initial mult_count
89: * (fixes problems with buggy WD drives)
90: * Version 3.13 remove excess "multiple mode disabled" messages
91: * Version 3.14 fix ide_error() handling of BUSY_STAT
92: * fix byte-swapped cdrom strings (again.. arghh!)
93: * ignore INDEX bit when checking the ALTSTATUS reg
94: * Version 3.15 add SINGLE_THREADED flag for use with dual-CMD i/f
95: * ignore WRERR_STAT for non-write operations
96: * added vlb_sync support for DC-2000A & others,
97: * (incl. some Promise chips), courtesy of Frank Gockel
98: * Version 3.16 convert vlb_32bit and vlb_sync into runtime flags
99: * add ioctls to get/set VLB flags (HDIO_[SG]ET_CHIPSET)
100: * rename SINGLE_THREADED to SUPPORT_SERIALIZE,
101: * add boot flag to "serialize" operation for CMD i/f
102: * add optional support for DTC2278 interfaces,
103: * courtesy of [email protected] (Dyan Wile).
104: * add boot flag to enable "dtc2278" probe
105: * add probe to avoid EATA (SCSI) interfaces,
106: * courtesy of [email protected].
107: * Version 4.00 tidy up verify_area() calls - [email protected]
108: * add flag to ignore WRERR_STAT for some drives
109: * courtesy of [email protected]
110: * assembly syntax tweak to vlb_sync
111: * removeable drive support from [email protected]
112: * add transparent support for DiskManager-6.0x "Dynamic
113: * Disk Overlay" (DDO), most of this is in genhd.c
114: * eliminate "multiple mode turned off" message at boot
115: * Version 4.10 fix bug in ioctl for "hdparm -c3"
116: * fix DM6:DDO support -- now works with LILO, fdisk, ...
117: * don't treat some naughty WD drives as removeable
118: * Version 4.11 updated DM6 support using info provided by OnTrack
119: * Version 5.00 major overhaul, multmode setting fixed, vlb_sync fixed
120: * added support for 3rd/4th/alternative IDE ports
121: * created ide.h; ide-cd.c now compiles separate from ide.c
122: * hopefully fixed infinite "unexpected_intr" from cdroms
123: * zillions of other changes and restructuring
124: * somehow reduced overall memory usage by several kB
125: * probably slowed things down slightly, but worth it
126: * Version 5.01 AT LAST!! Finally understood why "unexpected_intr"
127: * was happening at various times/places: whenever the
128: * ide-interface's ctl_port was used to "mask" the irq,
129: * it also would trigger an edge in the process of masking
130: * which would result in a self-inflicted interrupt!!
131: * (such a stupid way to build a hardware interrupt mask).
132: * This is now fixed (after a year of head-scratching).
133: * Version 5.02 got rid of need for {enable,disable}_irq_list()
134: * Version 5.03 tune-ups, comments, remove "busy wait" from drive resets
135: * removed PROBE_FOR_IRQS option -- no longer needed
136: * OOOPS! fixed "bad access" bug for 2nd drive on an i/f
137: * Version 5.04 changed "ira %d" to "irq %d" in DEBUG message
138: * added more comments, cleaned up unexpected_intr()
139: * OOOPS! fixed null pointer problem in ide reset code
140: * added autodetect for Triton chipset -- no effect yet
141: * Version 5.05 OOOPS! fixed bug in revalidate_disk()
142: * OOOPS! fixed bug in ide_do_request()
143: * added ATAPI reset sequence for cdroms
144: * Version 5.10 added Bus-Mastered DMA support for Triton Chipset
145: * some (mostly) cosmetic changes
146: * Version 5.11 added ht6560b support by [email protected]
147: * reworked PCI scanning code
148: * added automatic RZ1000 detection/support
149: * added automatic PCI CMD640 detection/support
150: * added option for VLB CMD640 support
151: * tweaked probe to find cdrom on hdb with disks on hda,hdc
152: * Version 5.12 some performance tuning
153: * added message to alert user to bad /dev/hd[cd] entries
154: * OOOPS! fixed bug in atapi reset
155: * driver now forces "serialize" again for all cmd640 chips
156: * noticed REALLY_SLOW_IO had no effect, moved it to ide.c
157: * made do_drive_cmd() into public ide_do_drive_cmd()
158: * Version 5.13 fixed typo ('B'), thanks to [email protected]
159: * fixed ht6560b support
160: * Version 5.13b (sss) fix problem in calling ide_cdrom_setup()
161: * don't bother invalidating nonexistent partitions
162: * Version 5.14 fixes to cmd640 support.. maybe it works now(?)
163: * added & tested full EZ-DRIVE support -- don't use LILO!
164: * don't enable 2nd CMD640 PCI port during init - conflict
165: * Version 5.15 bug fix in init_cmd640_vlb()
166: * bug fix in interrupt sharing code
167: * Version 5.16 ugh.. fix "serialize" support, broken in 5.15
168: * remove "Huh?" from cmd640 code
169: * added qd6580 interface speed select from Colten Edwards
170: * Version 5.17 kludge around bug in BIOS32 on Intel triton motherboards
171: * Version 5.18 new CMD640 code, moved to cmd640.c, #include'd for now
172: * new UMC8672 code, moved to umc8672.c, #include'd for now
173: * disallow turning on DMA when h/w not capable of DMA
174: * Version 5.19 fix potential infinite timeout on resets
175: * extend reset poll into a general purpose polling scheme
176: * add atapi tape drive support from Gadi Oxman
177: * simplify exit from _intr routines -- no IDE_DO_REQUEST
178: * Version 5.20 leave current rq on blkdev request list during I/O
179: * generalized ide_do_drive_cmd() for tape/cdrom driver use
180: * Version 5.21 fix nasty cdrom/tape bug (ide_preempt was messed up)
181: * Version 5.22 fix ide_xlate_1024() to work with/without drive->id
182: * Version 5.23 miscellaneous touch-ups
183: * Version 5.24 fix #if's for SUPPORT_CMD640
184: * Version 5.25 more touch-ups, fix cdrom resets, ...
185: * cmd640.c now configs/compiles separate from ide.c
186: * Version 5.26 keep_settings now maintains the using_dma flag
187: * fix [EZD] remap message to only output at boot time
188: * fix "bad /dev/ entry" message to say hdc, not hdc0
189: * fix ide_xlate_1024() to respect user specified CHS
190: * use CHS from partn table if it looks translated
191: * re-merged flags chipset,vlb_32bit,vlb_sync into io_32bit
192: * keep track of interface chipset type, when known
193: * add generic PIO mode "tuneproc" mechanism
194: * fix cmd640_vlb option
195: * fix ht6560b support (was completely broken)
196: * umc8672.c now configures/compiles separate from ide.c
197: * move dtc2278 support to dtc2278.c
198: * move ht6560b support to ht6560b.c
199: * move qd6580 support to qd6580.c
200: * add ali14xx support in ali14xx.c
201: * Version 5.27 add [no]autotune parameters to help cmd640
202: * move rz1000 support to rz1000.c
203: * Version 5.28 #include "ide_modes.h"
204: * fix disallow_unmask: now per-interface "no_unmask" bit
205: * force io_32bit to be the same on drive pairs of dtc2278
206: * improved IDE tape error handling, and tape DMA support
207: * bugfix in ide_do_drive_cmd() for cdroms + serialize
208: *
209: * Some additional driver compile-time options are in ide.h
210: *
211: * To do, in likely order of completion:
212: * - add Promise DC4030VL support from [email protected]
213: * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
214: */
215:
216: #if defined (MACH) && !defined (LINUX_IDE_DEBUG)
217: #undef DEBUG
218: #endif
219:
220: #undef REALLY_SLOW_IO /* most systems can safely undef this */
221:
222: #include <linux/config.h>
223: #include <linux/types.h>
224: #include <linux/string.h>
225: #include <linux/kernel.h>
226: #include <linux/delay.h>
227: #include <linux/timer.h>
228: #include <linux/mm.h>
229: #include <linux/ioport.h>
230: #include <linux/interrupt.h>
231: #include <linux/major.h>
232: #include <linux/blkdev.h>
233: #include <linux/errno.h>
234: #include <linux/hdreg.h>
235: #include <linux/genhd.h>
236: #include <linux/malloc.h>
237:
238: #include <asm/byteorder.h>
239: #include <asm/irq.h>
240: #include <asm/segment.h>
241: #include <asm/io.h>
242:
243: #ifdef CONFIG_PCI
244: #include <linux/bios32.h>
245: #include <linux/pci.h>
246: #endif /* CONFIG_PCI */
247:
248: #include "ide.h"
249: #include "ide_modes.h"
250:
251: static ide_hwgroup_t *irq_to_hwgroup [NR_IRQS];
252: static const byte ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
253:
254: static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
255: static const byte default_irqs[MAX_HWIFS] = {14, 15, 11, 10};
256:
257: #if (DISK_RECOVERY_TIME > 0)
258: /*
259: * For really screwy hardware (hey, at least it *can* be used with Linux)
260: * we can enforce a minimum delay time between successive operations.
261: */
262: static unsigned long read_timer(void)
263: {
264: unsigned long t, flags;
265: int i;
266:
267: save_flags(flags);
268: cli();
269: t = jiffies * 11932;
270: outb_p(0, 0x43);
271: i = inb_p(0x40);
272: i |= inb(0x40) << 8;
273: restore_flags(flags);
274: return (t - i);
275: }
276:
277: static void set_recovery_timer (ide_hwif_t *hwif)
278: {
279: hwif->last_time = read_timer();
280: }
281: #define SET_RECOVERY_TIMER(drive) set_recovery_timer (drive)
282:
283: #else
284:
285: #define SET_RECOVERY_TIMER(drive)
286:
287: #endif /* DISK_RECOVERY_TIME */
288:
289: /*
290: * init_ide_data() sets reasonable default values into all fields
291: * of all instances of the hwifs and drives, but only on the first call.
292: * Subsequent calls have no effect (they don't wipe out anything).
293: *
294: * This routine is normally called at driver initialization time,
295: * but may also be called MUCH earlier during kernel "command-line"
296: * parameter processing. As such, we cannot depend on any other parts
297: * of the kernel (such as memory allocation) to be functioning yet.
298: *
299: * This is too bad, as otherwise we could dynamically allocate the
300: * ide_drive_t structs as needed, rather than always consuming memory
301: * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
302: */
303: #define MAGIC_COOKIE 0x12345678
304: static void init_ide_data (void)
305: {
306: byte *p;
307: unsigned int h, unit;
308: static unsigned long magic_cookie = MAGIC_COOKIE;
309:
310: if (magic_cookie != MAGIC_COOKIE)
311: return; /* already initialized */
312: magic_cookie = 0;
313:
314: for (h = 0; h < NR_IRQS; ++h)
315: irq_to_hwgroup[h] = NULL;
316:
317: /* bulk initialize hwif & drive info with zeros */
318: p = ((byte *) ide_hwifs) + sizeof(ide_hwifs);
319: do {
320: *--p = 0;
321: } while (p > (byte *) ide_hwifs);
322:
323: /* fill in any non-zero initial values */
324: for (h = 0; h < MAX_HWIFS; ++h) {
325: ide_hwif_t *hwif = &ide_hwifs[h];
326:
327: hwif->index = h;
328: hwif->noprobe = (h > 1);
329: hwif->io_base = default_io_base[h];
330: hwif->ctl_port = hwif->io_base ? hwif->io_base+0x206 : 0x000;
331: #ifdef CONFIG_BLK_DEV_HD
332: if (hwif->io_base == HD_DATA)
333: hwif->noprobe = 1; /* may be overriden by ide_setup() */
334: #endif /* CONFIG_BLK_DEV_HD */
335: hwif->major = ide_hwif_to_major[h];
336: hwif->name[0] = 'i';
337: hwif->name[1] = 'd';
338: hwif->name[2] = 'e';
339: hwif->name[3] = '0' + h;
340: #ifdef CONFIG_BLK_DEV_IDETAPE
341: hwif->tape_drive = NULL;
342: #endif /* CONFIG_BLK_DEV_IDETAPE */
343: for (unit = 0; unit < MAX_DRIVES; ++unit) {
344: ide_drive_t *drive = &hwif->drives[unit];
345:
346: drive->select.all = (unit<<4)|0xa0;
347: drive->hwif = hwif;
348: drive->ctl = 0x08;
349: drive->ready_stat = READY_STAT;
350: drive->bad_wstat = BAD_W_STAT;
351: drive->special.b.recalibrate = 1;
352: drive->special.b.set_geometry = 1;
353: drive->name[0] = 'h';
354: drive->name[1] = 'd';
355: drive->name[2] = 'a' + (h * MAX_DRIVES) + unit;
356: }
357: }
358: }
359:
360: #if SUPPORT_VLB_SYNC
361: /*
362: * Some localbus EIDE interfaces require a special access sequence
363: * when using 32-bit I/O instructions to transfer data. We call this
364: * the "vlb_sync" sequence, which consists of three successive reads
365: * of the sector count register location, with interrupts disabled
366: * to ensure that the reads all happen together.
367: */
368: static inline void do_vlb_sync (unsigned short port) {
369: (void) inb (port);
370: (void) inb (port);
371: (void) inb (port);
372: }
373: #endif /* SUPPORT_VLB_SYNC */
374:
375: /*
376: * This is used for most PIO data transfers *from* the IDE interface
377: */
378: void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
379: {
380: unsigned short io_base = HWIF(drive)->io_base;
381: unsigned short data_reg = io_base+IDE_DATA_OFFSET;
382: byte io_32bit = drive->io_32bit;
383:
384: if (io_32bit) {
385: #if SUPPORT_VLB_SYNC
386: if (io_32bit & 2) {
387: cli();
388: do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
389: insl(data_reg, buffer, wcount);
390: if (drive->unmask)
391: sti();
392: } else
393: #endif /* SUPPORT_VLB_SYNC */
394: insl(data_reg, buffer, wcount);
395: } else
396: insw(data_reg, buffer, wcount<<1);
397: }
398:
399: /*
400: * This is used for most PIO data transfers *to* the IDE interface
401: */
402: void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
403: {
404: unsigned short io_base = HWIF(drive)->io_base;
405: unsigned short data_reg = io_base+IDE_DATA_OFFSET;
406: byte io_32bit = drive->io_32bit;
407:
408: if (io_32bit) {
409: #if SUPPORT_VLB_SYNC
410: if (io_32bit & 2) {
411: cli();
412: do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
413: outsl(data_reg, buffer, wcount);
414: if (drive->unmask)
415: sti();
416: } else
417: #endif /* SUPPORT_VLB_SYNC */
418: outsl(data_reg, buffer, wcount);
419: } else
420: outsw(data_reg, buffer, wcount<<1);
421: }
422:
423: /*
424: * This should get invoked any time we exit the driver to
425: * wait for an interrupt response from a drive. handler() points
426: * at the appropriate code to handle the next interrupt, and a
427: * timer is started to prevent us from waiting forever in case
428: * something goes wrong (see the timer_expiry() handler later on).
429: */
430: void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout)
431: {
432: ide_hwgroup_t *hwgroup = HWGROUP(drive);
433: #ifdef DEBUG
434: if (hwgroup->handler != NULL) {
435: printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
436: drive->name, hwgroup->handler, handler);
437: }
438: #endif
439: hwgroup->handler = handler;
440: hwgroup->timer.expires = jiffies + timeout;
441: add_timer(&(hwgroup->timer));
442: }
443:
444: /*
445: * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
446: * value for this drive (from its reported identification information).
447: *
448: * Returns: 1 if lba_capacity looks sensible
449: * 0 otherwise
450: */
451: static int lba_capacity_is_ok (struct hd_driveid *id)
452: {
453: unsigned long lba_sects = id->lba_capacity;
454: unsigned long chs_sects = id->cyls * id->heads * id->sectors;
455: unsigned long _10_percent = chs_sects / 10;
456:
457: /* perform a rough sanity check on lba_sects: within 10% is "okay" */
458: if ((lba_sects - chs_sects) < _10_percent)
459: return 1; /* lba_capacity is good */
460:
461: /* some drives have the word order reversed */
462: lba_sects = (lba_sects << 16) | (lba_sects >> 16);
463: if ((lba_sects - chs_sects) < _10_percent) {
464: id->lba_capacity = lba_sects; /* fix it */
465: return 1; /* lba_capacity is (now) good */
466: }
467: return 0; /* lba_capacity value is bad */
468: }
469:
470: /*
471: * current_capacity() returns the capacity (in sectors) of a drive
472: * according to its current geometry/LBA settings.
473: */
474: static unsigned long current_capacity (ide_drive_t *drive)
475: {
476: struct hd_driveid *id = drive->id;
477: unsigned long capacity;
478:
479: if (!drive->present)
480: return 0;
481: if (drive->media != ide_disk)
482: return 0x7fffffff; /* cdrom or tape */
483: /* Determine capacity, and use LBA if the drive properly supports it */
484: if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
485: drive->select.b.lba = 1;
486: capacity = id->lba_capacity;
487: } else {
488: drive->select.b.lba = 0;
489: capacity = drive->cyl * drive->head * drive->sect;
490: }
491: return (capacity - drive->sect0);
492: }
493:
494: /*
495: * ide_geninit() is called exactly *once* for each major, from genhd.c,
496: * at the beginning of the initial partition check for the drives.
497: */
498: static void ide_geninit (struct gendisk *gd)
499: {
500: unsigned int unit;
501: ide_hwif_t *hwif = gd->real_devices;
502:
503: for (unit = 0; unit < gd->nr_real; ++unit) {
504: ide_drive_t *drive = &hwif->drives[unit];
505: #ifdef CONFIG_BLK_DEV_IDECD
506: if (drive->present && drive->media == ide_cdrom)
507: ide_cdrom_setup(drive);
508: #endif /* CONFIG_BLK_DEV_IDECD */
509: #ifdef CONFIG_BLK_DEV_IDETAPE
510: if (drive->present && drive->media == ide_tape)
511: idetape_setup(drive);
512: #endif /* CONFIG_BLK_DEV_IDETAPE */
513: drive->part[0].nr_sects = current_capacity(drive);
514: if (!drive->present || drive->media != ide_disk) {
515: drive->part[0].start_sect = -1; /* skip partition check */
516: }
517: }
518: /*
519: * The partition check in genhd.c needs this string to identify
520: * our minor devices by name for display purposes.
521: * Note that doing this will prevent us from working correctly
522: * if ever called a second time for this major (never happens).
523: */
524: gd->real_devices = hwif->drives[0].name; /* name of first drive */
525: }
526:
527: /*
528: * init_gendisk() (as opposed to ide_geninit) is called for each major device,
529: * after probing for drives, to allocate partition tables and other data
530: * structures needed for the routines in genhd.c. ide_geninit() gets called
531: * somewhat later, during the partition check.
532: */
533: static void init_gendisk (ide_hwif_t *hwif)
534: {
535: struct gendisk *gd;
536: unsigned int unit, units, minors;
537: int *bs;
538:
539: /* figure out maximum drive number on the interface */
540: for (units = MAX_DRIVES; units > 0; --units) {
541: if (hwif->drives[units-1].present)
542: break;
543: }
544: minors = units * (1<<PARTN_BITS);
545: gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
546: gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
547: gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
548: bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
549:
550: /* cdroms and msdos f/s are examples of non-1024 blocksizes */
551: blksize_size[hwif->major] = bs;
552: for (unit = 0; unit < minors; ++unit)
553: *bs++ = BLOCK_SIZE;
554:
555: for (unit = 0; unit < units; ++unit)
556: hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
557:
558: gd->major = hwif->major; /* our major device number */
559: gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
560: gd->minor_shift = PARTN_BITS; /* num bits for partitions */
561: gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
562: gd->max_nr = units; /* max num real drives */
563: gd->nr_real = units; /* current num real drives */
564: gd->init = ide_geninit; /* initialization function */
565: gd->real_devices= hwif; /* ptr to internal data */
566:
567: gd->next = gendisk_head; /* link new major into list */
568: hwif->gd = gendisk_head = gd;
569: }
570:
571: static void do_reset1 (ide_drive_t *, int); /* needed below */
572:
573: #ifdef CONFIG_BLK_DEV_IDEATAPI
574: /*
575: * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
576: * during an atapi drive reset operation. If the drive has not yet responded,
577: * and we have not yet hit our maximum waiting time, then the timer is restarted
578: * for another 50ms.
579: */
580: static void atapi_reset_pollfunc (ide_drive_t *drive)
581: {
582: ide_hwgroup_t *hwgroup = HWGROUP(drive);
583: byte stat;
584:
585: OUT_BYTE (drive->select.all, IDE_SELECT_REG);
586: udelay (10);
587:
588: if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
589: printk("%s: ATAPI reset complete\n", drive->name);
590: } else {
591: if (jiffies < hwgroup->poll_timeout) {
592: ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
593: return; /* continue polling */
594: }
595: hwgroup->poll_timeout = 0; /* end of polling */
596: printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
597: do_reset1 (drive, 1); /* do it the old fashioned way */
598: }
599: hwgroup->poll_timeout = 0; /* done polling */
600: }
601: #endif /* CONFIG_BLK_DEV_IDEATAPI */
602:
603: /*
604: * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
605: * during an ide reset operation. If the drives have not yet responded,
606: * and we have not yet hit our maximum waiting time, then the timer is restarted
607: * for another 50ms.
608: */
609: static void reset_pollfunc (ide_drive_t *drive)
610: {
611: ide_hwgroup_t *hwgroup = HWGROUP(drive);
612: ide_hwif_t *hwif = HWIF(drive);
613: byte tmp;
614:
615: if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
616: if (jiffies < hwgroup->poll_timeout) {
617: ide_set_handler (drive, &reset_pollfunc, HZ/20);
618: return; /* continue polling */
619: }
620: printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
621: } else {
622: printk("%s: reset: ", hwif->name);
623: if ((tmp = GET_ERR()) == 1)
624: printk("success\n");
625: else {
626: printk("master: ");
627: switch (tmp & 0x7f) {
628: case 1: printk("passed");
629: break;
630: case 2: printk("formatter device error");
631: break;
632: case 3: printk("sector buffer error");
633: break;
634: case 4: printk("ECC circuitry error");
635: break;
636: case 5: printk("controlling MPU error");
637: break;
638: default:printk("error (0x%02x?)", tmp);
639: }
640: if (tmp & 0x80)
641: printk("; slave: failed");
642: printk("\n");
643: }
644: }
645: hwgroup->poll_timeout = 0; /* done polling */
646: }
647:
648: /*
649: * do_reset1() attempts to recover a confused drive by resetting it.
650: * Unfortunately, resetting a disk drive actually resets all devices on
651: * the same interface, so it can really be thought of as resetting the
652: * interface rather than resetting the drive.
653: *
654: * ATAPI devices have their own reset mechanism which allows them to be
655: * individually reset without clobbering other devices on the same interface.
656: *
657: * Unfortunately, the IDE interface does not generate an interrupt to let
658: * us know when the reset operation has finished, so we must poll for this.
659: * Equally poor, though, is the fact that this may a very long time to complete,
660: * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
661: * we set a timer to poll at 50ms intervals.
662: */
663: static void do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
664: {
665: unsigned int unit;
666: unsigned long flags;
667: ide_hwif_t *hwif = HWIF(drive);
668: ide_hwgroup_t *hwgroup = HWGROUP(drive);
669:
670: save_flags(flags);
671: cli(); /* Why ? */
672:
673: #ifdef CONFIG_BLK_DEV_IDEATAPI
674: /* For an ATAPI device, first try an ATAPI SRST. */
675: if (drive->media != ide_disk) {
676: if (!do_not_try_atapi) {
677: if (!drive->keep_settings)
678: drive->unmask = 0;
679: OUT_BYTE (drive->select.all, IDE_SELECT_REG);
680: udelay (20);
681: OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
682: hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
683: ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
684: restore_flags (flags);
685: return;
686: }
687: }
688: #endif /* CONFIG_BLK_DEV_IDEATAPI */
689:
690: /*
691: * First, reset any device state data we were maintaining
692: * for any of the drives on this interface.
693: */
694: for (unit = 0; unit < MAX_DRIVES; ++unit) {
695: ide_drive_t *rdrive = &hwif->drives[unit];
696: rdrive->special.all = 0;
697: rdrive->special.b.set_geometry = 1;
698: rdrive->special.b.recalibrate = 1;
699: if (OK_TO_RESET_CONTROLLER)
700: rdrive->mult_count = 0;
701: if (!rdrive->keep_settings) {
702: rdrive->using_dma = 0;
703: rdrive->mult_req = 0;
704: rdrive->unmask = 0;
705: }
706: if (rdrive->mult_req != rdrive->mult_count)
707: rdrive->special.b.set_multmode = 1;
708: }
709:
710: #if OK_TO_RESET_CONTROLLER
711: /*
712: * Note that we also set nIEN while resetting the device,
713: * to mask unwanted interrupts from the interface during the reset.
714: * However, due to the design of PC hardware, this will cause an
715: * immediate interrupt due to the edge transition it produces.
716: * This single interrupt gives us a "fast poll" for drives that
717: * recover from reset very quickly, saving us the first 50ms wait time.
718: */
719: OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
720: udelay(5); /* more than enough time */
721: OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
722: hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
723: ide_set_handler (drive, &reset_pollfunc, HZ/20);
724: #endif /* OK_TO_RESET_CONTROLLER */
725:
726: restore_flags (flags);
727: }
728:
729: /*
730: * ide_do_reset() is the entry point to the drive/interface reset code.
731: */
732: void ide_do_reset (ide_drive_t *drive)
733: {
734: do_reset1 (drive, 0);
735: #ifdef CONFIG_BLK_DEV_IDETAPE
736: if (drive->media == ide_tape)
737: drive->tape.reset_issued=1;
738: #endif /* CONFIG_BLK_DEV_IDETAPE */
739: }
740:
741: /*
742: * Clean up after success/failure of an explicit drive cmd
743: */
744: void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
745: {
746: unsigned long flags;
747: struct request *rq = HWGROUP(drive)->rq;
748:
749: if (rq->cmd == IDE_DRIVE_CMD) {
750: byte *args = (byte *) rq->buffer;
751: rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
752: if (args) {
753: args[0] = stat;
754: args[1] = err;
755: args[2] = IN_BYTE(IDE_NSECTOR_REG);
756: }
757: }
758: save_flags(flags);
759: cli();
760: blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
761: HWGROUP(drive)->rq = NULL;
762: rq->rq_status = RQ_INACTIVE;
763: if (rq->sem != NULL)
764: up(rq->sem);
765: restore_flags(flags);
766: }
767:
768: /*
769: * Error reporting, in human readable form (luxurious, but a memory hog).
770: */
771: byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
772: {
773: unsigned long flags;
774: byte err = 0;
775:
776: save_flags (flags);
777: sti();
778: printk("%s: %s: status=0x%02x", drive->name, msg, stat);
779: #if FANCY_STATUS_DUMPS
780: if (drive->media == ide_disk) {
781: printk(" { ");
782: if (stat & BUSY_STAT)
783: printk("Busy ");
784: else {
785: if (stat & READY_STAT) printk("DriveReady ");
786: if (stat & WRERR_STAT) printk("DeviceFault ");
787: if (stat & SEEK_STAT) printk("SeekComplete ");
788: if (stat & DRQ_STAT) printk("DataRequest ");
789: if (stat & ECC_STAT) printk("CorrectedError ");
790: if (stat & INDEX_STAT) printk("Index ");
791: if (stat & ERR_STAT) printk("Error ");
792: }
793: printk("}");
794: }
795: #endif /* FANCY_STATUS_DUMPS */
796: printk("\n");
797: if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
798: err = GET_ERR();
799: printk("%s: %s: error=0x%02x", drive->name, msg, err);
800: #if FANCY_STATUS_DUMPS
801: if (drive->media == ide_disk) {
802: printk(" { ");
803: if (err & BBD_ERR) printk("BadSector ");
804: if (err & ECC_ERR) printk("UncorrectableError ");
805: if (err & ID_ERR) printk("SectorIdNotFound ");
806: if (err & ABRT_ERR) printk("DriveStatusError ");
807: if (err & TRK0_ERR) printk("TrackZeroNotFound ");
808: if (err & MARK_ERR) printk("AddrMarkNotFound ");
809: printk("}");
810: if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
811: byte cur = IN_BYTE(IDE_SELECT_REG);
812: if (cur & 0x40) { /* using LBA? */
813: printk(", LBAsect=%ld", (unsigned long)
814: ((cur&0xf)<<24)
815: |(IN_BYTE(IDE_HCYL_REG)<<16)
816: |(IN_BYTE(IDE_LCYL_REG)<<8)
817: | IN_BYTE(IDE_SECTOR_REG));
818: } else {
819: printk(", CHS=%d/%d/%d",
820: (IN_BYTE(IDE_HCYL_REG)<<8) +
821: IN_BYTE(IDE_LCYL_REG),
822: cur & 0xf,
823: IN_BYTE(IDE_SECTOR_REG));
824: }
825: if (HWGROUP(drive)->rq)
826: printk(", sector=%ld", HWGROUP(drive)->rq->sector);
827: }
828: }
829: #endif /* FANCY_STATUS_DUMPS */
830: printk("\n");
831: }
832: restore_flags (flags);
833: return err;
834: }
835:
836: /*
837: * try_to_flush_leftover_data() is invoked in response to a drive
838: * unexpectedly having its DRQ_STAT bit set. As an alternative to
839: * resetting the drive, this routine tries to clear the condition
840: * by read a sector's worth of data from the drive. Of course,
841: * this may not help if the drive is *waiting* for data from *us*.
842: */
843: static void try_to_flush_leftover_data (ide_drive_t *drive)
844: {
845: int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
846:
847: while (i > 0) {
848: unsigned long buffer[16];
849: unsigned int wcount = (i > 16) ? 16 : i;
850: i -= wcount;
851: ide_input_data (drive, buffer, wcount);
852: }
853: }
854:
855: /*
856: * ide_error() takes action based on the error returned by the controller.
857: */
858: void ide_error (ide_drive_t *drive, const char *msg, byte stat)
859: {
860: struct request *rq;
861: byte err;
862:
863: err = ide_dump_status(drive, msg, stat);
864: if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
865: return;
866: /* retry only "normal" I/O: */
867: if (rq->cmd == IDE_DRIVE_CMD || (rq->cmd != READ && rq->cmd != WRITE && drive->media == ide_disk))
868: {
869: rq->errors = 1;
870: ide_end_drive_cmd(drive, stat, err);
871: return;
872: }
873: if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
874: rq->errors |= ERROR_RESET;
875: } else {
876: if (drive->media == ide_disk && (stat & ERR_STAT)) {
877: /* err has different meaning on cdrom and tape */
878: if (err & (BBD_ERR | ECC_ERR)) /* retries won't help these */
879: rq->errors = ERROR_MAX;
880: else if (err & TRK0_ERR) /* help it find track zero */
881: rq->errors |= ERROR_RECAL;
882: }
883: if ((stat & DRQ_STAT) && rq->cmd != WRITE)
884: try_to_flush_leftover_data(drive);
885: }
886: if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
887: rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
888:
889: if (rq->errors >= ERROR_MAX) {
890: #ifdef CONFIG_BLK_DEV_IDETAPE
891: if (drive->media == ide_tape) {
892: rq->errors = 0;
893: idetape_end_request(0, HWGROUP(drive));
894: }
895: else
896: #endif /* CONFIG_BLK_DEV_IDETAPE */
897: ide_end_request(0, HWGROUP(drive));
898: }
899: else {
900: if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
901: ++rq->errors;
902: ide_do_reset(drive);
903: return;
904: } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
905: drive->special.b.recalibrate = 1;
906: ++rq->errors;
907: }
908: }
909:
910: /*
911: * read_intr() is the handler for disk read/multread interrupts
912: */
913: static void read_intr (ide_drive_t *drive)
914: {
915: byte stat;
916: int i;
917: unsigned int msect, nsect;
918: struct request *rq;
919:
920: if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
921: ide_error(drive, "read_intr", stat);
922: return;
923: }
924: msect = drive->mult_count;
925: read_next:
926: rq = HWGROUP(drive)->rq;
927: if (msect) {
928: if ((nsect = rq->current_nr_sectors) > msect)
929: nsect = msect;
930: msect -= nsect;
931: } else
932: nsect = 1;
933: ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
934: #ifdef DEBUG
935: printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
936: drive->name, rq->sector, rq->sector+nsect-1,
937: (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
938: #endif
939: rq->sector += nsect;
940: rq->buffer += nsect<<9;
941: rq->errors = 0;
942: i = (rq->nr_sectors -= nsect);
943: if ((rq->current_nr_sectors -= nsect) <= 0)
944: ide_end_request(1, HWGROUP(drive));
945: if (i > 0) {
946: if (msect)
947: goto read_next;
948: ide_set_handler (drive, &read_intr, WAIT_CMD);
949: }
950: }
951:
952: /*
953: * write_intr() is the handler for disk write interrupts
954: */
955: static void write_intr (ide_drive_t *drive)
956: {
957: byte stat;
958: int i;
959: ide_hwgroup_t *hwgroup = HWGROUP(drive);
960: struct request *rq = hwgroup->rq;
961:
962: if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
963: #ifdef DEBUG
964: printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
965: drive->name, rq->sector, (unsigned long) rq->buffer,
966: rq->nr_sectors-1);
967: #endif
968: if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
969: rq->sector++;
970: rq->buffer += 512;
971: rq->errors = 0;
972: i = --rq->nr_sectors;
973: --rq->current_nr_sectors;
974: if (rq->current_nr_sectors <= 0)
975: ide_end_request(1, hwgroup);
976: if (i > 0) {
977: ide_output_data (drive, rq->buffer, SECTOR_WORDS);
978: ide_set_handler (drive, &write_intr, WAIT_CMD);
979: }
980: return;
981: }
982: }
983: ide_error(drive, "write_intr", stat);
984: }
985:
986: /*
987: * multwrite() transfers a block of one or more sectors of data to a drive
988: * as part of a disk multwrite operation.
989: */
990: static void multwrite (ide_drive_t *drive)
991: {
992: struct request *rq = &HWGROUP(drive)->wrq;
993: unsigned int mcount = drive->mult_count;
994:
995: do {
996: unsigned int nsect = rq->current_nr_sectors;
997: if (nsect > mcount)
998: nsect = mcount;
999: mcount -= nsect;
1000:
1001: ide_output_data(drive, rq->buffer, nsect<<7);
1002: #ifdef DEBUG
1003: printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1004: drive->name, rq->sector, (unsigned long) rq->buffer,
1005: nsect, rq->nr_sectors - nsect);
1006: #endif
1007: if ((rq->nr_sectors -= nsect) <= 0)
1008: break;
1009: if ((rq->current_nr_sectors -= nsect) == 0) {
1010: if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1011: rq->current_nr_sectors = rq->bh->b_size>>9;
1012: rq->buffer = rq->bh->b_data;
1013: } else {
1014: panic("%s: buffer list corrupted\n", drive->name);
1015: break;
1016: }
1017: } else {
1018: rq->buffer += nsect << 9;
1019: }
1020: } while (mcount);
1021: }
1022:
1023: /*
1024: * multwrite_intr() is the handler for disk multwrite interrupts
1025: */
1026: static void multwrite_intr (ide_drive_t *drive)
1027: {
1028: byte stat;
1029: int i;
1030: ide_hwgroup_t *hwgroup = HWGROUP(drive);
1031: struct request *rq = &hwgroup->wrq;
1032:
1033: if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1034: if (stat & DRQ_STAT) {
1035: if (rq->nr_sectors) {
1036: multwrite(drive);
1037: ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1038: return;
1039: }
1040: } else {
1041: if (!rq->nr_sectors) { /* all done? */
1042: rq = hwgroup->rq;
1043: for (i = rq->nr_sectors; i > 0;){
1044: i -= rq->current_nr_sectors;
1045: ide_end_request(1, hwgroup);
1046: }
1047: return;
1048: }
1049: }
1050: }
1051: ide_error(drive, "multwrite_intr", stat);
1052: }
1053:
1054: /*
1055: * Issue a simple drive command
1056: * The drive must be selected beforehand.
1057: */
1058: static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
1059: {
1060: ide_set_handler (drive, handler, WAIT_CMD);
1061: OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1062: OUT_BYTE(nsect,IDE_NSECTOR_REG);
1063: OUT_BYTE(cmd,IDE_COMMAND_REG);
1064: }
1065:
1066: /*
1067: * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1068: */
1069: static void set_multmode_intr (ide_drive_t *drive)
1070: {
1071: byte stat = GET_STAT();
1072:
1073: sti();
1074: if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1075: drive->mult_count = drive->mult_req;
1076: } else {
1077: drive->mult_req = drive->mult_count = 0;
1078: drive->special.b.recalibrate = 1;
1079: (void) ide_dump_status(drive, "set_multmode", stat);
1080: }
1081: }
1082:
1083: /*
1084: * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1085: */
1086: static void set_geometry_intr (ide_drive_t *drive)
1087: {
1088: byte stat = GET_STAT();
1089:
1090: sti();
1091: if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1092: ide_error(drive, "set_geometry_intr", stat);
1093: }
1094:
1095: /*
1096: * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1097: */
1098: static void recal_intr (ide_drive_t *drive)
1099: {
1100: byte stat = GET_STAT();
1101:
1102: sti();
1103: if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1104: ide_error(drive, "recal_intr", stat);
1105: }
1106:
1107: /*
1108: * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1109: */
1110: static void drive_cmd_intr (ide_drive_t *drive)
1111: {
1112: byte stat = GET_STAT();
1113:
1114: sti();
1115: if (OK_STAT(stat,READY_STAT,BAD_STAT))
1116: ide_end_drive_cmd (drive, stat, GET_ERR());
1117: else
1118: ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
1119: }
1120:
1121: /*
1122: * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1123: * commands to a drive. It used to do much more, but has been scaled back.
1124: */
1125: static inline void do_special (ide_drive_t *drive)
1126: {
1127: special_t *s = &drive->special;
1128: next:
1129: #ifdef DEBUG
1130: printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1131: #endif
1132: if (s->b.set_geometry) {
1133: s->b.set_geometry = 0;
1134: if (drive->media == ide_disk) {
1135: OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1136: OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1137: OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1138: OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1139: ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1140: }
1141: } else if (s->b.recalibrate) {
1142: s->b.recalibrate = 0;
1143: if (drive->media == ide_disk) {
1144: ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1145: }
1146: } else if (s->b.set_pio) {
1147: ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
1148: s->b.set_pio = 0;
1149: if (tuneproc != NULL)
1150: tuneproc(drive, drive->pio_req);
1151: goto next;
1152: } else if (s->b.set_multmode) {
1153: s->b.set_multmode = 0;
1154: if (drive->media == ide_disk) {
1155: if (drive->id && drive->mult_req > drive->id->max_multsect)
1156: drive->mult_req = drive->id->max_multsect;
1157: ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1158: } else
1159: drive->mult_req = 0;
1160: } else if (s->all) {
1161: s->all = 0;
1162: printk("%s: bad special flag: 0x%02x\n", drive->name, s->all);
1163: }
1164: }
1165:
1166: /*
1167: * This routine busy-waits for the drive status to be not "busy".
1168: * It then checks the status for all of the "good" bits and none
1169: * of the "bad" bits, and if all is okay it returns 0. All other
1170: * cases return 1 after invoking ide_error() -- caller should just return.
1171: *
1172: * This routine should get fixed to not hog the cpu during extra long waits..
1173: * That could be done by busy-waiting for the first jiffy or two, and then
1174: * setting a timer to wake up at half second intervals thereafter,
1175: * until timeout is achieved, before timing out.
1176: */
1177: int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
1178: {
1179: byte stat;
1180: unsigned long flags;
1181:
1182: test:
1183: udelay(1); /* spec allows drive 400ns to change "BUSY" */
1184: if (OK_STAT((stat = GET_STAT()), good, bad))
1185: return 0; /* fast exit for most frequent case */
1186: if (!(stat & BUSY_STAT)) {
1187: ide_error(drive, "status error", stat);
1188: return 1;
1189: }
1190:
1191: save_flags(flags);
1192: sti();
1193: timeout += jiffies;
1194: do {
1195: if (!((stat = GET_STAT()) & BUSY_STAT)) {
1196: restore_flags(flags);
1197: goto test;
1198: }
1199: } while (jiffies <= timeout);
1200:
1201: restore_flags(flags);
1202: ide_error(drive, "status timeout", GET_STAT());
1203: return 1;
1204: }
1205:
1206: /*
1207: * do_rw_disk() issues WIN_{MULT}READ and WIN_{MULT}WRITE commands to a disk,
1208: * using LBA if supported, or CHS otherwise, to address sectors. It also takes
1209: * care of issuing special DRIVE_CMDs.
1210: */
1211: static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
1212: {
1213: unsigned short io_base = HWIF(drive)->io_base;
1214:
1215: OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1216: OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1217: if (drive->select.b.lba) {
1218: #ifdef DEBUG
1219: printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1220: drive->name, (rq->cmd==READ)?"read":"writ",
1221: block, rq->nr_sectors, (unsigned long) rq->buffer);
1222: #endif
1223: OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1224: OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1225: OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1226: OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1227: } else {
1228: unsigned int sect,head,cyl,track;
1229: track = block / drive->sect;
1230: sect = block % drive->sect + 1;
1231: OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1232: head = track % drive->head;
1233: cyl = track / drive->head;
1234: OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1235: OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1236: OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1237: #ifdef DEBUG
1238: printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1239: drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1240: head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1241: #endif
1242: }
1243: if (rq->cmd == READ) {
1244: #ifdef CONFIG_BLK_DEV_TRITON
1245: if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1246: return;
1247: #endif /* CONFIG_BLK_DEV_TRITON */
1248: ide_set_handler(drive, &read_intr, WAIT_CMD);
1249: OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1250: return;
1251: }
1252: if (rq->cmd == WRITE) {
1253: #ifdef CONFIG_BLK_DEV_TRITON
1254: if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1255: return;
1256: #endif /* CONFIG_BLK_DEV_TRITON */
1257: OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1258: if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1259: printk("%s: no DRQ after issuing %s\n", drive->name,
1260: drive->mult_count ? "MULTWRITE" : "WRITE");
1261: return;
1262: }
1263: if (!drive->unmask)
1264: cli();
1265: if (drive->mult_count) {
1266: HWGROUP(drive)->wrq = *rq; /* scratchpad */
1267: ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1268: multwrite(drive);
1269: } else {
1270: ide_set_handler (drive, &write_intr, WAIT_CMD);
1271: ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1272: }
1273: return;
1274: }
1275: if (rq->cmd == IDE_DRIVE_CMD) {
1276: byte *args = rq->buffer;
1277: if (args) {
1278: #ifdef DEBUG
1279: printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x\n",
1280: drive->name, args[0], args[1], args[2]);
1281: #endif
1282: OUT_BYTE(args[2],io_base+IDE_FEATURE_OFFSET);
1283: ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1284: return;
1285: } else {
1286: /*
1287: * NULL is actually a valid way of waiting for
1288: * all current requests to be flushed from the queue.
1289: */
1290: #ifdef DEBUG
1291: printk("%s: DRIVE_CMD (null)\n", drive->name);
1292: #endif
1293: ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
1294: return;
1295: }
1296: }
1297: printk("%s: bad command: %d\n", drive->name, rq->cmd);
1298: ide_end_request(0, HWGROUP(drive));
1299: }
1300:
1301: /*
1302: * do_request() initiates handling of a new I/O request
1303: */
1304: static inline void do_request (ide_hwif_t *hwif, struct request *rq)
1305: {
1306: unsigned int minor, unit;
1307: unsigned long block, blockend;
1308: ide_drive_t *drive;
1309:
1310: sti();
1311: #ifdef DEBUG
1312: printk("%s: do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1313: #endif
1314: minor = MINOR(rq->rq_dev);
1315: unit = minor >> PARTN_BITS;
1316: if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1317: printk("%s: bad device number: %s\n",
1318: hwif->name, kdevname(rq->rq_dev));
1319: goto kill_rq;
1320: }
1321: drive = &hwif->drives[unit];
1322: #ifdef DEBUG
1323: if (rq->bh && !buffer_locked(rq->bh)) {
1324: printk("%s: block not locked\n", drive->name);
1325: goto kill_rq;
1326: }
1327: #endif
1328: block = rq->sector;
1329: blockend = block + rq->nr_sectors;
1330: if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1331: printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1332: (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1333: goto kill_rq;
1334: }
1335: block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1336: #if FAKE_FDISK_FOR_EZDRIVE
1337: if (block == 0 && drive->remap_0_to_1)
1338: block = 1; /* redirect MBR access to EZ-Drive partn table */
1339: #endif /* FAKE_FDISK_FOR_EZDRIVE */
1340: ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1341: #ifdef CONFIG_BLK_DEV_HT6560B
1342: if (hwif->selectproc)
1343: hwif->selectproc (drive);
1344: #endif /* CONFIG_BLK_DEV_HT6560B */
1345: #if (DISK_RECOVERY_TIME > 0)
1346: while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1347: #endif
1348:
1349: #ifdef CONFIG_BLK_DEV_IDETAPE
1350: POLL_HWIF_TAPE_DRIVE; /* macro from ide-tape.h */
1351: #endif /* CONFIG_BLK_DEV_IDETAPE */
1352:
1353: OUT_BYTE(drive->select.all,IDE_SELECT_REG);
1354: if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1355: printk("%s: drive not ready for command\n", drive->name);
1356: return;
1357: }
1358:
1359: if (!drive->special.all) {
1360: #ifdef CONFIG_BLK_DEV_IDEATAPI
1361: switch (drive->media) {
1362: case ide_disk:
1363: do_rw_disk (drive, rq, block);
1364: return;
1365: #ifdef CONFIG_BLK_DEV_IDECD
1366: case ide_cdrom:
1367: ide_do_rw_cdrom (drive, block);
1368: return;
1369: #endif /* CONFIG_BLK_DEV_IDECD */
1370: #ifdef CONFIG_BLK_DEV_IDETAPE
1371: case ide_tape:
1372: if (rq->cmd == IDE_DRIVE_CMD) {
1373: byte *args = (byte *) rq->buffer;
1374: OUT_BYTE(args[2],IDE_FEATURE_REG);
1375: ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1376: return;
1377: }
1378: idetape_do_request (drive, rq, block);
1379: return;
1380: #endif /* CONFIG_BLK_DEV_IDETAPE */
1381:
1382: default:
1383: printk("%s: media type %d not supported\n",
1384: drive->name, drive->media);
1385: goto kill_rq;
1386: }
1387: #else
1388: do_rw_disk (drive, rq, block); /* simpler and faster */
1389: return;
1390: #endif /* CONFIG_BLK_DEV_IDEATAPI */;
1391: }
1392: do_special(drive);
1393: return;
1394: kill_rq:
1395: ide_end_request(0, hwif->hwgroup);
1396: }
1397:
1398: /*
1399: * The driver enables interrupts as much as possible. In order to do this,
1400: * (a) the device-interrupt is always masked before entry, and
1401: * (b) the timeout-interrupt is always disabled before entry.
1402: *
1403: * If we enter here from, say irq14, and then start a new request for irq15,
1404: * (possible with "serialize" option) then we cannot ensure that we exit
1405: * before the irq15 hits us. So, we must be careful not to let this bother us.
1406: *
1407: * Interrupts are still masked (by default) whenever we are exchanging
1408: * data/cmds with a drive, because some drives seem to have very poor
1409: * tolerance for latency during I/O. For devices which don't suffer from
1410: * this problem (most don't), the unmask flag can be set using the "hdparm"
1411: * utility, to permit other interrupts during data/cmd transfers.
1412: */
1413: void ide_do_request (ide_hwgroup_t *hwgroup)
1414: {
1415: cli(); /* paranoia */
1416: if (hwgroup->handler != NULL) {
1417: printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1418: return;
1419: }
1420: do {
1421: ide_hwif_t *hwif = hwgroup->hwif;
1422: struct request *rq;
1423: if ((rq = hwgroup->rq) == NULL) {
1424: do {
1425: rq = blk_dev[hwif->major].current_request;
1426: if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1427: goto got_rq;
1428: } while ((hwif = hwif->next) != hwgroup->hwif);
1429: return; /* no work left for this hwgroup */
1430: }
1431: got_rq:
1432: do_request(hwgroup->hwif = hwif, hwgroup->rq = rq);
1433: cli();
1434: } while (hwgroup->handler == NULL);
1435: }
1436:
1437: /*
1438: * do_hwgroup_request() invokes ide_do_request() after first masking
1439: * all possible interrupts for the current hwgroup. This prevents race
1440: * conditions in the event that an unexpected interrupt occurs while
1441: * we are in the driver.
1442: *
1443: * Note that when an interrupt is used to reenter the driver, the first level
1444: * handler will already have masked the irq that triggered, but any other ones
1445: * for the hwgroup will still be unmasked. The driver tries to be careful
1446: * about such things.
1447: */
1448: static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
1449: {
1450: if (hwgroup->handler == NULL) {
1451: ide_hwif_t *hgif = hwgroup->hwif;
1452: ide_hwif_t *hwif = hgif;
1453: do {
1454: disable_irq(hwif->irq);
1455: } while ((hwif = hwif->next) != hgif);
1456: ide_do_request (hwgroup);
1457: do {
1458: enable_irq(hwif->irq);
1459: } while ((hwif = hwif->next) != hgif);
1460: }
1461: }
1462:
1463: static void do_ide0_request (void) /* invoked with cli() */
1464: {
1465: do_hwgroup_request (ide_hwifs[0].hwgroup);
1466: }
1467:
1468: static void do_ide1_request (void) /* invoked with cli() */
1469: {
1470: do_hwgroup_request (ide_hwifs[1].hwgroup);
1471: }
1472:
1473: static void do_ide2_request (void) /* invoked with cli() */
1474: {
1475: do_hwgroup_request (ide_hwifs[2].hwgroup);
1476: }
1477:
1478: static void do_ide3_request (void) /* invoked with cli() */
1479: {
1480: do_hwgroup_request (ide_hwifs[3].hwgroup);
1481: }
1482:
1483: static void timer_expiry (unsigned long data)
1484: {
1485: ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1486: ide_drive_t *drive = hwgroup->drive;
1487: unsigned long flags;
1488:
1489: save_flags(flags);
1490: cli();
1491:
1492: if (hwgroup->poll_timeout != 0) { /* polling in progress? */
1493: ide_handler_t *handler = hwgroup->handler;
1494: hwgroup->handler = NULL;
1495: handler(drive);
1496: } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1497: sti(); /* drive must have responded just as the timer expired */
1498: printk("%s: marginal timeout\n", drive->name);
1499: } else {
1500: hwgroup->handler = NULL; /* abort the operation */
1501: if (hwgroup->hwif->dmaproc)
1502: (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1503: ide_error(drive, "irq timeout", GET_STAT());
1504: }
1505: if (hwgroup->handler == NULL)
1506: do_hwgroup_request (hwgroup);
1507: restore_flags(flags);
1508: }
1509:
1510: /*
1511: * There's nothing really useful we can do with an unexpected interrupt,
1512: * other than reading the status register (to clear it), and logging it.
1513: * There should be no way that an irq can happen before we're ready for it,
1514: * so we needn't worry much about losing an "important" interrupt here.
1515: *
1516: * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1517: * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1518: * "good", we just ignore the interrupt completely.
1519: *
1520: * This routine assumes cli() is in effect when called.
1521: *
1522: * If an unexpected interrupt happens on irq15 while we are handling irq14
1523: * and if the two interfaces are "serialized" (CMD640B), then it looks like
1524: * we could screw up by interfering with a new request being set up for irq15.
1525: *
1526: * In reality, this is a non-issue. The new command is not sent unless the
1527: * drive is ready to accept one, in which case we know the drive is not
1528: * trying to interrupt us. And ide_set_handler() is always invoked before
1529: * completing the issuance of any new drive command, so we will not be
1530: * accidently invoked as a result of any valid command completion interrupt.
1531: *
1532: */
1533: static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
1534: {
1535: byte stat;
1536: unsigned int unit;
1537: ide_hwif_t *hwif = hwgroup->hwif;
1538:
1539: /*
1540: * handle the unexpected interrupt
1541: */
1542: do {
1543: if (hwif->irq == irq) {
1544: for (unit = 0; unit < MAX_DRIVES; ++unit) {
1545: ide_drive_t *drive = &hwif->drives[unit];
1546: if (!drive->present)
1547: continue;
1548: #ifdef CONFIG_BLK_DEV_HT6560B
1549: if (hwif->selectproc)
1550: hwif->selectproc (drive);
1551: #endif /* CONFIG_BLK_DEV_HT6560B */
1552: if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT))
1553: (void) ide_dump_status(drive, "unexpected_intr", stat);
1554: if ((stat & DRQ_STAT))
1555: try_to_flush_leftover_data(drive);
1556: }
1557: }
1558: } while ((hwif = hwif->next) != hwgroup->hwif);
1559: #ifdef CONFIG_BLK_DEV_HT6560B
1560: if (hwif->selectproc)
1561: hwif->selectproc (hwgroup->drive);
1562: #endif /* CONFIG_BLK_DEV_HT6560B */
1563: }
1564:
1565: /*
1566: * entry point for all interrupts, caller does cli() for us
1567: */
1568: static void ide_intr (int irq, struct pt_regs *regs)
1569: {
1570: ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
1571: ide_handler_t *handler;
1572:
1573: if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1574: ide_drive_t *drive = hwgroup->drive;
1575: hwgroup->handler = NULL;
1576: del_timer(&(hwgroup->timer));
1577: if (drive->unmask)
1578: sti();
1579: handler(drive);
1580: cli(); /* this is necessary, as next rq may be different irq */
1581: if (hwgroup->handler == NULL) {
1582: SET_RECOVERY_TIMER(HWIF(drive));
1583: ide_do_request(hwgroup);
1584: }
1585: } else {
1586: unexpected_intr(irq, hwgroup);
1587: }
1588: cli();
1589: }
1590:
1591: /*
1592: * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1593: * It returns NULL if the given device number does not match any present drives.
1594: */
1595: static ide_drive_t *get_info_ptr (kdev_t i_rdev)
1596: {
1597: int major = MAJOR(i_rdev);
1598: unsigned int h;
1599:
1600: for (h = 0; h < MAX_HWIFS; ++h) {
1601: ide_hwif_t *hwif = &ide_hwifs[h];
1602: if (hwif->present && major == hwif->major) {
1603: unsigned unit = DEVICE_NR(i_rdev);
1604: if (unit < MAX_DRIVES) {
1605: ide_drive_t *drive = &hwif->drives[unit];
1606: if (drive->present)
1607: return drive;
1608: } else if (major == IDE0_MAJOR && unit < 4) {
1609: printk("ide: probable bad entry for /dev/hd%c\n", 'a'+unit);
1610: printk("ide: to fix it, run: /usr/src/linux/drivers/block/MAKEDEV.ide\n");
1611: }
1612: break;
1613: }
1614: }
1615: return NULL;
1616: }
1617:
1618: /*
1619: * This function is intended to be used prior to invoking ide_do_drive_cmd().
1620: */
1621: void ide_init_drive_cmd (struct request *rq)
1622: {
1623: rq->buffer = NULL;
1624: rq->cmd = IDE_DRIVE_CMD;
1625: rq->sector = 0;
1626: rq->nr_sectors = 0;
1627: rq->current_nr_sectors = 0;
1628: rq->sem = NULL;
1629: rq->bh = NULL;
1630: rq->bhtail = NULL;
1631: rq->next = NULL;
1632:
1633: #if 0 /* these are done each time through ide_do_drive_cmd() */
1634: rq->errors = 0;
1635: rq->rq_status = RQ_ACTIVE;
1636: rq->rq_dev = ????;
1637: #endif
1638: }
1639:
1640: /*
1641: * This function issues a special IDE device request
1642: * onto the request queue.
1643: *
1644: * If action is ide_wait, then then rq is queued at the end of
1645: * the request queue, and the function sleeps until it has been
1646: * processed. This is for use when invoked from an ioctl handler.
1647: *
1648: * If action is ide_preempt, then the rq is queued at the head of
1649: * the request queue, displacing the currently-being-processed
1650: * request and this function returns immediately without waiting
1651: * for the new rq to be completed. This is VERY DANGEROUS, and is
1652: * intended for careful use by the ATAPI tape/cdrom driver code.
1653: *
1654: * If action is ide_next, then the rq is queued immediately after
1655: * the currently-being-processed-request (if any), and the function
1656: * returns without waiting for the new rq to be completed. As above,
1657: * This is VERY DANGEROUS, and is intended for careful use by the
1658: * ATAPI tape/cdrom driver code.
1659: *
1660: * If action is ide_end, then the rq is queued at the end of the
1661: * request queue, and the function returns immediately without waiting
1662: * for the new rq to be completed. This is again intended for careful
1663: * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
1664: * when operating in the pipelined operation mode).
1665: */
1666: int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
1667: {
1668: unsigned long flags;
1669: unsigned int major = HWIF(drive)->major;
1670: struct request *cur_rq;
1671: struct blk_dev_struct *bdev = &blk_dev[major];
1672: struct semaphore sem = MUTEX_LOCKED;
1673:
1674: rq->errors = 0;
1675: rq->rq_status = RQ_ACTIVE;
1676: rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
1677: if (action == ide_wait)
1678: rq->sem = &sem;
1679:
1680: save_flags(flags);
1681: cli();
1682: cur_rq = bdev->current_request;
1683:
1684: if (cur_rq == NULL || action == ide_preempt) {
1685: rq->next = cur_rq;
1686: bdev->current_request = rq;
1687: if (action == ide_preempt) {
1688: HWGROUP(drive)->rq = NULL;
1689: } else
1690: if (HWGROUP(drive)->rq == NULL) { /* is this necessary (?) */
1691: bdev->request_fn();
1692: cli();
1693: }
1694: } else {
1695: if (action == ide_wait || action == ide_end) {
1696: while (cur_rq->next != NULL) /* find end of list */
1697: cur_rq = cur_rq->next;
1698: }
1699: rq->next = cur_rq->next;
1700: cur_rq->next = rq;
1701: }
1702: if (action == ide_wait && rq->rq_status != RQ_INACTIVE)
1703: down(&sem); /* wait for it to be serviced */
1704: restore_flags(flags);
1705: return rq->errors ? -EIO : 0; /* return -EIO if errors */
1706: }
1707:
1708: static int ide_open(struct inode * inode, struct file * filp)
1709: {
1710: ide_drive_t *drive;
1711: unsigned long flags;
1712:
1713: if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1714: return -ENODEV;
1715: save_flags(flags);
1716: cli();
1717: while (drive->busy)
1718: sleep_on(&drive->wqueue);
1719: drive->usage++;
1720: restore_flags(flags);
1721: #ifdef CONFIG_BLK_DEV_IDECD
1722: if (drive->media == ide_cdrom)
1723: return ide_cdrom_open (inode, filp, drive);
1724: #endif /* CONFIG_BLK_DEV_IDECD */
1725: #ifdef CONFIG_BLK_DEV_IDETAPE
1726: if (drive->media == ide_tape)
1727: return idetape_blkdev_open (inode, filp, drive);
1728: #endif /* CONFIG_BLK_DEV_IDETAPE */
1729: if (drive->removeable) {
1730: byte door_lock[] = {WIN_DOORLOCK,0,0,0};
1731: struct request rq;
1732: check_disk_change(inode->i_rdev);
1733: ide_init_drive_cmd (&rq);
1734: rq.buffer = door_lock;
1735: /*
1736: * Ignore the return code from door_lock,
1737: * since the open() has already succeeded,
1738: * and the door_lock is irrelevant at this point.
1739: */
1740: (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1741: }
1742: return 0;
1743: }
1744:
1745: /*
1746: * Releasing a block device means we sync() it, so that it can safely
1747: * be forgotten about...
1748: */
1749: static void ide_release(struct inode * inode, struct file * file)
1750: {
1751: ide_drive_t *drive;
1752:
1753: if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
1754: sync_dev(inode->i_rdev);
1755: drive->usage--;
1756: #ifdef CONFIG_BLK_DEV_IDECD
1757: if (drive->media == ide_cdrom) {
1758: ide_cdrom_release (inode, file, drive);
1759: return;
1760: }
1761: #endif /* CONFIG_BLK_DEV_IDECD */
1762: #ifdef CONFIG_BLK_DEV_IDETAPE
1763: if (drive->media == ide_tape) {
1764: idetape_blkdev_release (inode, file, drive);
1765: return;
1766: }
1767: #endif /* CONFIG_BLK_DEV_IDETAPE */
1768: if (drive->removeable) {
1769: byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
1770: struct request rq;
1771: invalidate_buffers(inode->i_rdev);
1772: ide_init_drive_cmd (&rq);
1773: rq.buffer = door_unlock;
1774: (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1775: }
1776: }
1777: }
1778:
1779: /*
1780: * This routine is called to flush all partitions and partition tables
1781: * for a changed disk, and then re-read the new partition table.
1782: * If we are revalidating a disk because of a media change, then we
1783: * enter with usage == 0. If we are using an ioctl, we automatically have
1784: * usage == 1 (we need an open channel to use an ioctl :-), so this
1785: * is our limit.
1786: */
1787: static int revalidate_disk(kdev_t i_rdev)
1788: {
1789: ide_drive_t *drive;
1790: unsigned int p, major, minor;
1791: long flags;
1792:
1793: if ((drive = get_info_ptr(i_rdev)) == NULL)
1794: return -ENODEV;
1795:
1796: major = MAJOR(i_rdev);
1797: minor = drive->select.b.unit << PARTN_BITS;
1798: save_flags(flags);
1799: cli();
1800: if (drive->busy || (drive->usage > 1)) {
1801: restore_flags(flags);
1802: return -EBUSY;
1803: };
1804: drive->busy = 1;
1805: restore_flags(flags);
1806:
1807: for (p = 0; p < (1<<PARTN_BITS); ++p) {
1808: if (drive->part[p].nr_sects > 0) {
1809: kdev_t devp = MKDEV(major, minor+p);
1810: sync_dev (devp);
1811: invalidate_inodes (devp);
1812: invalidate_buffers (devp);
1813: }
1814: drive->part[p].start_sect = 0;
1815: drive->part[p].nr_sects = 0;
1816: };
1817:
1818: drive->part[0].nr_sects = current_capacity(drive);
1819: if (drive->media == ide_disk)
1820: resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
1821:
1822: drive->busy = 0;
1823: wake_up(&drive->wqueue);
1824: return 0;
1825: }
1826:
1827: static int write_fs_long (unsigned long useraddr, long value)
1828: {
1829: int err;
1830:
1831: if (NULL == (long *)useraddr)
1832: return -EINVAL;
1833: if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
1834: return err;
1835: put_user((unsigned)value, (long *) useraddr);
1836: return 0;
1837: }
1838:
1839: static int ide_ioctl (struct inode *inode, struct file *file,
1840: unsigned int cmd, unsigned long arg)
1841: {
1842: struct hd_geometry *loc = (struct hd_geometry *) arg;
1843: int err;
1844: ide_drive_t *drive;
1845: unsigned long flags;
1846: struct request rq;
1847:
1848: ide_init_drive_cmd (&rq);
1849: if (!inode || !(inode->i_rdev))
1850: return -EINVAL;
1851: if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1852: return -ENODEV;
1853: switch (cmd) {
1854: case HDIO_GETGEO:
1855: if (!loc || drive->media != ide_disk) return -EINVAL;
1856: err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
1857: if (err) return err;
1858: put_user(drive->bios_head, (byte *) &loc->heads);
1859: put_user(drive->bios_sect, (byte *) &loc->sectors);
1860: put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
1861: put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
1862: (unsigned long *) &loc->start);
1863: return 0;
1864:
1865: case BLKFLSBUF:
1866: if(!suser()) return -EACCES;
1867: fsync_dev(inode->i_rdev);
1868: invalidate_buffers(inode->i_rdev);
1869: return 0;
1870:
1871: case BLKRASET:
1872: if(!suser()) return -EACCES;
1873: if(arg > 0xff) return -EINVAL;
1874: read_ahead[MAJOR(inode->i_rdev)] = arg;
1875: return 0;
1876:
1877: case BLKRAGET:
1878: return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
1879:
1880: case BLKGETSIZE: /* Return device size */
1881: return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
1882: case BLKRRPART: /* Re-read partition tables */
1883: return revalidate_disk(inode->i_rdev);
1884:
1885: case HDIO_GET_KEEPSETTINGS:
1886: return write_fs_long(arg, drive->keep_settings);
1887:
1888: case HDIO_GET_UNMASKINTR:
1889: return write_fs_long(arg, drive->unmask);
1890:
1891: case HDIO_GET_DMA:
1892: return write_fs_long(arg, drive->using_dma);
1893:
1894: case HDIO_GET_32BIT:
1895: return write_fs_long(arg, drive->io_32bit);
1896:
1897: case HDIO_GET_MULTCOUNT:
1898: return write_fs_long(arg, drive->mult_count);
1899:
1900: case HDIO_GET_IDENTITY:
1901: if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
1902: return -EINVAL;
1903: if (drive->id == NULL)
1904: return -ENOMSG;
1905: err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
1906: if (!err)
1907: memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
1908: return err;
1909:
1910: case HDIO_GET_NOWERR:
1911: return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
1912:
1913: case HDIO_SET_DMA:
1914: #ifdef CONFIG_BLK_DEV_IDECD
1915: if (drive->media == ide_cdrom)
1916: return -EPERM;
1917: #endif /* CONFIG_BLK_DEV_IDECD */
1918: if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
1919: return -EPERM;
1920: case HDIO_SET_KEEPSETTINGS:
1921: case HDIO_SET_UNMASKINTR:
1922: case HDIO_SET_NOWERR:
1923: if (arg > 1)
1924: return -EINVAL;
1925: case HDIO_SET_32BIT:
1926: if (!suser())
1927: return -EACCES;
1928: if ((MINOR(inode->i_rdev) & PARTN_MASK))
1929: return -EINVAL;
1930: save_flags(flags);
1931: cli();
1932: switch (cmd) {
1933: case HDIO_SET_DMA:
1934: if (!(HWIF(drive)->dmaproc)) {
1935: restore_flags(flags);
1936: return -EPERM;
1937: }
1938: drive->using_dma = arg;
1939: break;
1940: case HDIO_SET_KEEPSETTINGS:
1941: drive->keep_settings = arg;
1942: break;
1943: case HDIO_SET_UNMASKINTR:
1944: if (arg && HWIF(drive)->no_unmask) {
1945: restore_flags(flags);
1946: return -EPERM;
1947: }
1948: drive->unmask = arg;
1949: break;
1950: case HDIO_SET_NOWERR:
1951: drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
1952: break;
1953: case HDIO_SET_32BIT:
1954: if (arg > (1 + (SUPPORT_VLB_SYNC<<1)))
1955: return -EINVAL;
1956: drive->io_32bit = arg;
1957: #ifdef CONFIG_BLK_DEV_DTC2278
1958: if (HWIF(drive)->chipset == ide_dtc2278)
1959: HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
1960: #endif /* CONFIG_BLK_DEV_DTC2278 */
1961: break;
1962: }
1963: restore_flags(flags);
1964: return 0;
1965:
1966: case HDIO_SET_MULTCOUNT:
1967: if (!suser())
1968: return -EACCES;
1969: if (MINOR(inode->i_rdev) & PARTN_MASK)
1970: return -EINVAL;
1971: if (drive->id && arg > drive->id->max_multsect)
1972: return -EINVAL;
1973: save_flags(flags);
1974: cli();
1975: if (drive->special.b.set_multmode) {
1976: restore_flags(flags);
1977: return -EBUSY;
1978: }
1979: drive->mult_req = arg;
1980: drive->special.b.set_multmode = 1;
1981: restore_flags(flags);
1982: (void) ide_do_drive_cmd (drive, &rq, ide_wait);
1983: return (drive->mult_count == arg) ? 0 : -EIO;
1984:
1985: case HDIO_DRIVE_CMD:
1986: {
1987: unsigned long args;
1988:
1989: if (NULL == (long *) arg)
1990: err = ide_do_drive_cmd(drive, &rq, ide_wait);
1991: else {
1992: if (!(err = verify_area(VERIFY_READ,(long *)arg,sizeof(long))))
1993: {
1994: args = get_user((long *)arg);
1995: if (!(err = verify_area(VERIFY_WRITE,(long *)arg,sizeof(long)))) {
1996: rq.buffer = (char *) &args;
1997: err = ide_do_drive_cmd(drive, &rq, ide_wait);
1998: put_user(args,(long *)arg);
1999: }
2000: }
2001: }
2002: return err;
2003: }
2004: case HDIO_SET_PIO_MODE:
2005: if (!suser())
2006: return -EACCES;
2007: if (MINOR(inode->i_rdev) & PARTN_MASK)
2008: return -EINVAL;
2009: if (!HWIF(drive)->tuneproc)
2010: return -ENOSYS;
2011: save_flags(flags);
2012: cli();
2013: drive->pio_req = (int) arg;
2014: drive->special.b.set_pio = 1;
2015: restore_flags(flags);
2016: return 0;
2017:
2018: RO_IOCTLS(inode->i_rdev, arg);
2019:
2020: default:
2021: #ifdef CONFIG_BLK_DEV_IDECD
2022: if (drive->media == ide_cdrom)
2023: return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
2024: #endif /* CONFIG_BLK_DEV_IDECD */
2025: #ifdef CONFIG_BLK_DEV_IDETAPE
2026: if (drive->media == ide_tape)
2027: return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
2028: #endif /* CONFIG_BLK_DEV_IDETAPE */
2029: return -EPERM;
2030: }
2031: }
2032:
2033: static int ide_check_media_change (kdev_t i_rdev)
2034: {
2035: ide_drive_t *drive;
2036:
2037: if ((drive = get_info_ptr(i_rdev)) == NULL)
2038: return -ENODEV;
2039: #ifdef CONFIG_BLK_DEV_IDECD
2040: if (drive->media == ide_cdrom)
2041: return ide_cdrom_check_media_change (drive);
2042: #endif /* CONFIG_BLK_DEV_IDECD */
2043: if (drive->removeable) /* for disks */
2044: return 1; /* always assume it was changed */
2045: return 0;
2046: }
2047:
2048: void ide_fixstring (byte *s, const int bytecount, const int byteswap)
2049: {
2050: byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
2051:
2052: if (byteswap) {
2053: /* convert from big-endian to host byte order */
2054: for (p = end ; p != s;) {
2055: unsigned short *pp = (unsigned short *) (p -= 2);
2056: *pp = ntohs(*pp);
2057: }
2058: }
2059:
2060: /* strip leading blanks */
2061: while (s != end && *s == ' ')
2062: ++s;
2063:
2064: /* compress internal blanks and strip trailing blanks */
2065: while (s != end && *s) {
2066: if (*s++ != ' ' || (s != end && *s && *s != ' '))
2067: *p++ = *(s-1);
2068: }
2069:
2070: /* wipe out trailing garbage */
2071: while (p != end)
2072: *p++ = '\0';
2073: }
2074:
2075: static inline void do_identify (ide_drive_t *drive, byte cmd)
2076: {
2077: int bswap;
2078: struct hd_driveid *id;
2079: unsigned long capacity, check;
2080:
2081: id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
2082: ide_input_data(drive, id, SECTOR_WORDS); /* read 512 bytes of id info */
2083: sti();
2084:
2085: /*
2086: * EATA SCSI controllers do a hardware ATA emulation: ignore them
2087: */
2088: if ((id->model[0] == 'P' && id->model[1] == 'M')
2089: || (id->model[0] == 'S' && id->model[1] == 'K')) {
2090: printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
2091: drive->present = 0;
2092: return;
2093: }
2094:
2095: /*
2096: * WIN_IDENTIFY returns little-endian info,
2097: * WIN_PIDENTIFY *usually* returns little-endian info.
2098: */
2099: bswap = 1;
2100: if (cmd == WIN_PIDENTIFY) {
2101: if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2102: || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2103: || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2104: bswap = 0; /* Vertos drives may still be weird */
2105: }
2106: ide_fixstring (id->model, sizeof(id->model), bswap);
2107: ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2108: ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2109:
2110: /*
2111: * Check for an ATAPI device
2112: */
2113:
2114: if (cmd == WIN_PIDENTIFY) {
2115: byte type = (id->config >> 8) & 0x1f;
2116: printk("%s: %s, ATAPI ", drive->name, id->model);
2117: switch (type) {
2118: case 0: /* Early cdrom models used zero */
2119: case 5:
2120: #ifdef CONFIG_BLK_DEV_IDECD
2121: printk ("CDROM drive\n");
2122: drive->media = ide_cdrom;
2123: drive->present = 1;
2124: drive->removeable = 1;
2125: return;
2126: #else
2127: printk ("CDROM ");
2128: break;
2129: #endif /* CONFIG_BLK_DEV_IDECD */
2130: case 1:
2131: #ifdef CONFIG_BLK_DEV_IDETAPE
2132: printk ("TAPE drive");
2133: if (idetape_identify_device (drive,id)) {
2134: drive->media = ide_tape;
2135: drive->present = 1;
2136: drive->removeable = 1;
2137: if (HWIF(drive)->dmaproc != NULL &&
2138: !HWIF(drive)->dmaproc(ide_dma_check, drive))
2139: printk(", DMA");
2140: printk("\n");
2141: }
2142: else {
2143: drive->present = 0;
2144: printk ("\nide-tape: the tape is not supported by this version of the driver\n");
2145: }
2146: return;
2147: #else
2148: printk ("TAPE ");
2149: break;
2150: #endif /* CONFIG_BLK_DEV_IDETAPE */
2151: default:
2152: drive->present = 0;
2153: printk("Type %d - Unknown device\n", type);
2154: return;
2155: }
2156: drive->present = 0;
2157: printk("- not supported by this kernel\n");
2158: return;
2159: }
2160:
2161: /* check for removeable disks (eg. SYQUEST), ignore 'WD' drives */
2162: if (id->config & (1<<7)) { /* removeable disk ? */
2163: if (id->model[0] != 'W' || id->model[1] != 'D')
2164: drive->removeable = 1;
2165: }
2166:
2167: drive->media = ide_disk;
2168: /* Extract geometry if we did not already have one for the drive */
2169: if (!drive->present) {
2170: drive->present = 1;
2171: drive->cyl = drive->bios_cyl = id->cyls;
2172: drive->head = drive->bios_head = id->heads;
2173: drive->sect = drive->bios_sect = id->sectors;
2174: }
2175: /* Handle logical geometry translation by the drive */
2176: if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2177: && (id->cur_heads <= 16) && id->cur_sectors)
2178: {
2179: /*
2180: * Extract the physical drive geometry for our use.
2181: * Note that we purposely do *not* update the bios info.
2182: * This way, programs that use it (like fdisk) will
2183: * still have the same logical view as the BIOS does,
2184: * which keeps the partition table from being screwed.
2185: *
2186: * An exception to this is the cylinder count,
2187: * which we reexamine later on to correct for 1024 limitations.
2188: */
2189: drive->cyl = id->cur_cyls;
2190: drive->head = id->cur_heads;
2191: drive->sect = id->cur_sectors;
2192:
2193: /* check for word-swapped "capacity" field in id information */
2194: capacity = drive->cyl * drive->head * drive->sect;
2195: check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2196: if (check == capacity) { /* was it swapped? */
2197: /* yes, bring it into little-endian order: */
2198: id->cur_capacity0 = (capacity >> 0) & 0xffff;
2199: id->cur_capacity1 = (capacity >> 16) & 0xffff;
2200: }
2201: }
2202: /* Use physical geometry if what we have still makes no sense */
2203: if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2204: drive->cyl = id->cyls;
2205: drive->head = id->heads;
2206: drive->sect = id->sectors;
2207: }
2208: /* Correct the number of cyls if the bios value is too small */
2209: if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2210: if (drive->cyl > drive->bios_cyl)
2211: drive->bios_cyl = drive->cyl;
2212: }
2213:
2214: (void) current_capacity (drive); /* initialize LBA selection */
2215:
2216: printk ("%s: %.40s, %ldMB w/%dKB Cache, %sCHS=%d/%d/%d",
2217: drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2218: drive->select.b.lba ? "LBA, " : "",
2219: drive->bios_cyl, drive->bios_head, drive->bios_sect);
2220:
2221: drive->mult_count = 0;
2222: if (id->max_multsect) {
2223: drive->mult_req = INITIAL_MULT_COUNT;
2224: if (drive->mult_req > id->max_multsect)
2225: drive->mult_req = id->max_multsect;
2226: if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2227: drive->special.b.set_multmode = 1;
2228: }
2229: if (HWIF(drive)->dmaproc != NULL) { /* hwif supports DMA? */
2230: if (!(HWIF(drive)->dmaproc(ide_dma_check, drive)))
2231: printk(", DMA");
2232: }
2233: printk("\n");
2234: }
2235:
2236: /*
2237: * Delay for *at least* 10ms. As we don't know how much time is left
2238: * until the next tick occurs, we wait an extra tick to be safe.
2239: * This is used only during the probing/polling for drives at boot time.
2240: */
2241: static void delay_10ms (void)
2242: {
2243: unsigned long timer = jiffies + (HZ + 99)/100 + 1;
2244: while (timer > jiffies);
2245: }
2246:
2247: /*
2248: * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2249: * and waits for a response. It also monitors irqs while this is
2250: * happening, in hope of automatically determining which one is
2251: * being used by the interface.
2252: *
2253: * Returns: 0 device was identified
2254: * 1 device timed-out (no response to identify request)
2255: * 2 device aborted the command (refused to identify itself)
2256: */
2257: static int try_to_identify (ide_drive_t *drive, byte cmd)
2258: {
2259: int hd_status, rc;
2260: unsigned long timeout;
2261: int irqs = 0;
2262:
2263: if (!HWIF(drive)->irq) { /* already got an IRQ? */
2264: probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2265: irqs = probe_irq_on(); /* start monitoring irqs */
2266: OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2267: }
2268:
2269: delay_10ms(); /* take a deep breath */
2270: if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2271: printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2272: hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2273: } else
2274: hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2275:
2276: OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2277: timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2278: timeout += jiffies;
2279: do {
2280: if (jiffies > timeout) {
2281: if (!HWIF(drive)->irq)
2282: (void) probe_irq_off(irqs);
2283: return 1; /* drive timed-out */
2284: }
2285: delay_10ms(); /* give drive a breather */
2286: } while (IN_BYTE(hd_status) & BUSY_STAT);
2287:
2288: delay_10ms(); /* wait for IRQ and DRQ_STAT */
2289: if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2290: cli(); /* some systems need this */
2291: do_identify(drive, cmd); /* drive returned ID */
2292: if (drive->present && drive->media != ide_tape) {
2293: ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
2294: if (tuneproc != NULL && drive->autotune == 1)
2295: tuneproc(drive, 255); /* auto-tune PIO mode */
2296: }
2297: rc = 0; /* drive responded with ID */
2298: } else
2299: rc = 2; /* drive refused ID */
2300: if (!HWIF(drive)->irq) {
2301: irqs = probe_irq_off(irqs); /* get irq number */
2302: if (irqs > 0)
2303: HWIF(drive)->irq = irqs;
2304: else /* Mmmm.. multiple IRQs */
2305: printk("%s: IRQ probe failed (%d)\n", drive->name, irqs);
2306: }
2307: return rc;
2308: }
2309:
2310: /*
2311: * do_probe() has the difficult job of finding a drive if it exists,
2312: * without getting hung up if it doesn't exist, without trampling on
2313: * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2314: *
2315: * If a drive is "known" to exist (from CMOS or kernel parameters),
2316: * but does not respond right away, the probe will "hang in there"
2317: * for the maximum wait time (about 30 seconds), otherwise it will
2318: * exit much more quickly.
2319: *
2320: * Returns: 0 device was identified
2321: * 1 device timed-out (no response to identify request)
2322: * 2 device aborted the command (refused to identify itself)
2323: * 3 bad status from device (possible for ATAPI drives)
2324: * 4 probe was not attempted because failure was obvious
2325: */
2326: static int do_probe (ide_drive_t *drive, byte cmd)
2327: {
2328: int rc;
2329: #ifdef CONFIG_BLK_DEV_IDEATAPI
2330: if (drive->present) { /* avoid waiting for inappropriate probes */
2331: if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
2332: return 4;
2333: }
2334: #endif /* CONFIG_BLK_DEV_IDEATAPI */
2335: #ifdef DEBUG
2336: printk("probing for %s: present=%d, media=%d, probetype=%s\n",
2337: drive->name, drive->present, drive->media,
2338: (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2339: #endif
2340: #ifdef CONFIG_BLK_DEV_HT6560B
2341: if (HWIF(drive)->selectproc)
2342: HWIF(drive)->selectproc (drive);
2343: #endif /* CONFIG_BLK_DEV_HT6560B */
2344: OUT_BYTE(drive->select.all,IDE_SELECT_REG); /* select target drive */
2345: delay_10ms(); /* wait for BUSY_STAT */
2346: if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2347: OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2348: return 3; /* no i/f present: avoid killing ethernet cards */
2349: }
2350:
2351: if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2352: || drive->present || cmd == WIN_PIDENTIFY)
2353: {
2354: if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2355: rc = try_to_identify(drive,cmd); /* failed: try again */
2356: if (rc == 1)
2357: printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2358: (void) GET_STAT(); /* ensure drive irq is clear */
2359: } else {
2360: rc = 3; /* not present or maybe ATAPI */
2361: }
2362: if (drive->select.b.unit != 0) {
2363: OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2364: delay_10ms();
2365: (void) GET_STAT(); /* ensure drive irq is clear */
2366: }
2367: return rc;
2368: }
2369:
2370: /*
2371: * probe_for_drive() tests for existance of a given drive using do_probe().
2372: *
2373: * Returns: 0 no device was found
2374: * 1 device was found (note: drive->present might still be 0)
2375: */
2376: static inline byte probe_for_drive (ide_drive_t *drive)
2377: {
2378: if (drive->noprobe) /* skip probing? */
2379: return drive->present;
2380: if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2381: #ifdef CONFIG_BLK_DEV_IDEATAPI
2382: (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2383: #endif /* CONFIG_BLK_DEV_IDEATAPI */
2384: }
2385: if (!drive->present)
2386: return 0; /* drive not found */
2387: if (drive->id == NULL) { /* identification failed? */
2388: if (drive->media == ide_disk) {
2389: printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2390: drive->name, drive->cyl, drive->head, drive->sect);
2391: }
2392: #ifdef CONFIG_BLK_DEV_IDECD
2393: else if (drive->media == ide_cdrom) {
2394: printk("%s: ATAPI cdrom (?)\n", drive->name);
2395: }
2396: #endif /* CONFIG_BLK_DEV_IDECD */
2397: else {
2398: drive->present = 0; /* nuke it */
2399: return 1; /* drive was found */
2400: }
2401: }
2402: if (drive->media == ide_disk && !drive->select.b.lba) {
2403: if (!drive->head || drive->head > 16) {
2404: printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2405: drive->name, drive->head);
2406: drive->present = 0;
2407: }
2408: }
2409: return 1; /* drive was found */
2410: }
2411:
2412: /*
2413: * This routine only knows how to look for drive units 0 and 1
2414: * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2415: */
2416: static void probe_for_drives (ide_hwif_t *hwif)
2417: {
2418: unsigned int unit;
2419:
2420: if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2421: int msgout = 0;
2422: for (unit = 0; unit < MAX_DRIVES; ++unit) {
2423: ide_drive_t *drive = &hwif->drives[unit];
2424: if (drive->present) {
2425: drive->present = 0;
2426: printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2427: msgout = 1;
2428: }
2429: }
2430: if (!msgout)
2431: printk("%s: ports already in use, skipping probe\n", hwif->name);
2432: } else {
2433: unsigned long flags;
2434: save_flags(flags);
2435:
2436: #if (MAX_DRIVES > 2)
2437: printk("%s: probing for first 2 of %d possible drives\n", hwif->name, MAX_DRIVES);
2438: #endif
2439: sti(); /* needed for jiffies and irq probing */
2440: /*
2441: * Second drive should only exist if first drive was found,
2442: * but a lot of cdrom drives seem to be configured as slave-only
2443: */
2444: for (unit = 0; unit < 2; ++unit) { /* note the hardcoded '2' */
2445: ide_drive_t *drive = &hwif->drives[unit];
2446: (void) probe_for_drive (drive);
2447: }
2448: for (unit = 0; unit < MAX_DRIVES; ++unit) {
2449: ide_drive_t *drive = &hwif->drives[unit];
2450: if (drive->present) {
2451: hwif->present = 1;
2452: request_region(hwif->io_base, 8, hwif->name);
2453: request_region(hwif->ctl_port, 1, hwif->name);
2454: break;
2455: }
2456: }
2457: restore_flags(flags);
2458: }
2459: }
2460:
2461: /*
2462: * stridx() returns the offset of c within s,
2463: * or -1 if c is '\0' or not found within s.
2464: */
2465: static int stridx (const char *s, char c)
2466: {
2467: char *i = strchr(s, c);
2468: return (i && c) ? i - s : -1;
2469: }
2470:
2471: /*
2472: * match_parm() does parsing for ide_setup():
2473: *
2474: * 1. the first char of s must be '='.
2475: * 2. if the remainder matches one of the supplied keywords,
2476: * the index (1 based) of the keyword is negated and returned.
2477: * 3. if the remainder is a series of no more than max_vals numbers
2478: * separated by commas, the numbers are saved in vals[] and a
2479: * count of how many were saved is returned. Base10 is assumed,
2480: * and base16 is allowed when prefixed with "0x".
2481: * 4. otherwise, zero is returned.
2482: */
2483: static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
2484: {
2485: static const char *decimal = "0123456789";
2486: static const char *hex = "0123456789abcdef";
2487: int i, n;
2488:
2489: if (*s++ == '=') {
2490: /*
2491: * Try matching against the supplied keywords,
2492: * and return -(index+1) if we match one
2493: */
2494: for (i = 0; *keywords != NULL; ++i) {
2495: if (!strcmp(s, *keywords++))
2496: return -(i+1);
2497: }
2498: /*
2499: * Look for a series of no more than "max_vals"
2500: * numeric values separated by commas, in base10,
2501: * or base16 when prefixed with "0x".
2502: * Return a count of how many were found.
2503: */
2504: for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
2505: vals[n] = i;
2506: while ((i = stridx(decimal, *++s)) >= 0)
2507: vals[n] = (vals[n] * 10) + i;
2508: if (*s == 'x' && !vals[n]) {
2509: while ((i = stridx(hex, *++s)) >= 0)
2510: vals[n] = (vals[n] * 0x10) + i;
2511: }
2512: if (++n == max_vals)
2513: break;
2514: if (*s == ',')
2515: ++s;
2516: }
2517: if (!*s)
2518: return n;
2519: }
2520: return 0; /* zero = nothing matched */
2521: }
2522:
2523: /*
2524: * ide_setup() gets called VERY EARLY during initialization,
2525: * to handle kernel "command line" strings beginning with "hdx="
2526: * or "ide". Here is the complete set currently supported:
2527: *
2528: * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
2529: * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
2530: *
2531: * "hdx=noprobe" : drive may be present, but do not probe for it
2532: * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
2533: * "hdx=cdrom" : drive is present, and is a cdrom drive
2534: * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
2535: * "hdx=autotune" : driver will attempt to tune interface speed
2536: * to the fastest PIO mode supported,
2537: * if possible for this drive only.
2538: * Not fully supported by all chipset types,
2539: * and quite likely to cause trouble with
2540: * older/odd IDE drives.
2541: *
2542: * "idex=noprobe" : do not attempt to access/use this interface
2543: * "idex=base" : probe for an interface at the addr specified,
2544: * where "base" is usually 0x1f0 or 0x170
2545: * and "ctl" is assumed to be "base"+0x206
2546: * "idex=base,ctl" : specify both base and ctl
2547: * "idex=base,ctl,irq" : specify base, ctl, and irq number
2548: * "idex=autotune" : driver will attempt to tune interface speed
2549: * to the fastest PIO mode supported,
2550: * for all drives on this interface.
2551: * Not fully supported by all chipset types,
2552: * and quite likely to cause trouble with
2553: * older/odd IDE drives.
2554: * "idex=noautotune" : driver will NOT attempt to tune interface speed
2555: * This is the default for most chipsets,
2556: * except the cmd640.
2557: *
2558: * The following two are valid ONLY on ide0,
2559: * and the defaults for the base,ctl ports must not be altered.
2560: *
2561: * "ide0=serialize" : do not overlap operations on ide0 and ide1.
2562: * "ide0=dtc2278" : probe/support DTC2278 interface
2563: * "ide0=ht6560b" : probe/support HT6560B interface
2564: * "ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
2565: * (not for PCI -- automatically detected)
2566: * "ide0=qd6580" : probe/support qd6580 interface
2567: * "ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
2568: * "ide0=umc8672" : probe/support umc8672 chipsets
2569: */
2570: void ide_setup (char *s)
2571: {
2572: int i, vals[3];
2573: ide_hwif_t *hwif;
2574: ide_drive_t *drive;
2575: unsigned int hw, unit;
2576: const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
2577: const char max_hwif = '0' + (MAX_HWIFS - 1);
2578:
2579: printk("ide_setup: %s", s);
2580: init_ide_data ();
2581:
2582: /*
2583: * Look for drive options: "hdx="
2584: */
2585: if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
2586: const char *hd_words[] = {"noprobe", "nowerr", "cdrom", "serialize",
2587: "autotune", "noautotune", NULL};
2588: unit = s[2] - 'a';
2589: hw = unit / MAX_DRIVES;
2590: unit = unit % MAX_DRIVES;
2591: hwif = &ide_hwifs[hw];
2592: drive = &hwif->drives[unit];
2593: switch (match_parm(&s[3], hd_words, vals, 3)) {
2594: case -1: /* "noprobe" */
2595: drive->noprobe = 1;
2596: goto done;
2597: case -2: /* "nowerr" */
2598: drive->bad_wstat = BAD_R_STAT;
2599: hwif->noprobe = 0;
2600: goto done;
2601: case -3: /* "cdrom" */
2602: drive->present = 1;
2603: drive->media = ide_cdrom;
2604: hwif->noprobe = 0;
2605: goto done;
2606: case -4: /* "serialize" */
2607: printk(" -- USE \"ide%c=serialize\" INSTEAD", '0'+hw);
2608: goto do_serialize;
2609: case -5: /* "autotune" */
2610: drive->autotune = 1;
2611: goto done;
2612: case -6: /* "noautotune" */
2613: drive->autotune = 2;
2614: goto done;
2615: case 3: /* cyl,head,sect */
2616: drive->media = ide_disk;
2617: drive->cyl = drive->bios_cyl = vals[0];
2618: drive->head = drive->bios_head = vals[1];
2619: drive->sect = drive->bios_sect = vals[2];
2620: drive->present = 1;
2621: drive->forced_geom = 1;
2622: hwif->noprobe = 0;
2623: goto done;
2624: default:
2625: goto bad_option;
2626: }
2627: }
2628: /*
2629: * Look for interface options: "idex="
2630: */
2631: if (s[0] == 'i' && s[1] == 'd' && s[2] == 'e' && s[3] >= '0' && s[3] <= max_hwif) {
2632: /*
2633: * Be VERY CAREFUL changing this: note hardcoded indexes below
2634: */
2635: const char *ide_words[] = {"noprobe", "serialize", "autotune", "noautotune",
2636: "qd6580", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", NULL};
2637: hw = s[3] - '0';
2638: hwif = &ide_hwifs[hw];
2639: i = match_parm(&s[4], ide_words, vals, 3);
2640:
2641: /*
2642: * Cryptic check to ensure chipset not already set for hwif:
2643: */
2644: if (i != -1 && i != -2) {
2645: if (hwif->chipset != ide_unknown)
2646: goto bad_option;
2647: if (i < 0 && ide_hwifs[1].chipset != ide_unknown)
2648: goto bad_option;
2649: }
2650: /*
2651: * Interface keywords work only for ide0:
2652: */
2653: if (i <= -6 && hw != 0)
2654: goto bad_hwif;
2655:
2656: switch (i) {
2657: #ifdef CONFIG_BLK_DEV_ALI14XX
2658: case -10: /* "ali14xx" */
2659: {
2660: extern void init_ali14xx (void);
2661: init_ali14xx();
2662: goto done;
2663: }
2664: #endif /* CONFIG_BLK_DEV_ALI14XX */
2665: #ifdef CONFIG_BLK_DEV_UMC8672
2666: case -9: /* "umc8672" */
2667: {
2668: extern void init_umc8672 (void);
2669: init_umc8672();
2670: goto done;
2671: }
2672: #endif /* CONFIG_BLK_DEV_UMC8672 */
2673: #ifdef CONFIG_BLK_DEV_DTC2278
2674: case -8: /* "dtc2278" */
2675: {
2676: extern void init_dtc2278 (void);
2677: init_dtc2278();
2678: goto done;
2679: }
2680: #endif /* CONFIG_BLK_DEV_DTC2278 */
2681: #ifdef CONFIG_BLK_DEV_CMD640
2682: case -7: /* "cmd640_vlb" */
2683: {
2684: extern int cmd640_vlb; /* flag for cmd640.c */
2685: cmd640_vlb = 1;
2686: goto done;
2687: }
2688: #endif /* CONFIG_BLK_DEV_CMD640 */
2689: #ifdef CONFIG_BLK_DEV_HT6560B
2690: case -6: /* "ht6560b" */
2691: {
2692: extern void init_ht6560b (void);
2693: init_ht6560b();
2694: goto done;
2695: }
2696: #endif /* CONFIG_BLK_DEV_HT6560B */
2697: #if CONFIG_BLK_DEV_QD6580
2698: case -5: /* "qd6580" (no secondary i/f) */
2699: {
2700: extern void init_qd6580 (void);
2701: init_qd6580();
2702: goto done;
2703: }
2704: #endif /* CONFIG_BLK_DEV_QD6580 */
2705: case -4: /* "noautotune" */
2706: hwif->drives[0].autotune = 2;
2707: hwif->drives[1].autotune = 2;
2708: goto done;
2709: case -3: /* "autotune" */
2710: hwif->drives[0].autotune = 1;
2711: hwif->drives[1].autotune = 1;
2712: goto done;
2713: case -2: /* "serialize" */
2714: do_serialize:
2715: if (hw > 1) goto bad_hwif;
2716: ide_hwifs[0].serialized = 1;
2717: goto done;
2718:
2719: case -1: /* "noprobe" */
2720: hwif->noprobe = 1;
2721: goto done;
2722:
2723: case 1: /* base */
2724: vals[1] = vals[0] + 0x206; /* default ctl */
2725: case 2: /* base,ctl */
2726: vals[2] = 0; /* default irq = probe for it */
2727: case 3: /* base,ctl,irq */
2728: hwif->io_base = vals[0];
2729: hwif->ctl_port = vals[1];
2730: hwif->irq = vals[2];
2731: hwif->noprobe = 0;
2732: hwif->chipset = ide_generic;
2733: goto done;
2734:
2735: case 0: goto bad_option;
2736: default:
2737: printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
2738: return;
2739: }
2740: }
2741: bad_option:
2742: printk(" -- BAD OPTION\n");
2743: return;
2744: bad_hwif:
2745: printk("-- NOT SUPPORTED ON ide%d", hw);
2746: done:
2747: printk("\n");
2748: }
2749:
2750: /*
2751: * This routine is called from the partition-table code in genhd.c
2752: * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
2753: *
2754: * The second parameter, "xparm", determines exactly how the translation
2755: * will be handled:
2756: * 0 = convert to CHS with fewer than 1024 cyls
2757: * using the same method as Ontrack DiskManager.
2758: * 1 = same as "0", plus offset everything by 63 sectors.
2759: * -1 = similar to "0", plus redirect sector 0 to sector 1.
2760: * >1 = convert to a CHS geometry with "xparm" heads.
2761: *
2762: * Returns 0 if the translation was not possible, if the device was not
2763: * an IDE disk drive, or if a geometry was "forced" on the commandline.
2764: * Returns 1 if the geometry translation was successful.
2765: */
2766: int ide_xlate_1024 (kdev_t i_rdev, int xparm, const char *msg)
2767: {
2768: ide_drive_t *drive;
2769: static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
2770: const byte *heads = head_vals;
2771: unsigned long tracks;
2772:
2773: if ((drive = get_info_ptr(i_rdev)) == NULL || drive->forced_geom)
2774: return 0;
2775:
2776: if (xparm > 1 && xparm <= drive->bios_head && drive->bios_sect == 63)
2777: return 0; /* we already have a translation */
2778:
2779: printk("%s ", msg);
2780:
2781: if (drive->id) {
2782: drive->cyl = drive->id->cyls;
2783: drive->head = drive->id->heads;
2784: drive->sect = drive->id->sectors;
2785: }
2786: drive->bios_cyl = drive->cyl;
2787: drive->bios_head = drive->head;
2788: drive->bios_sect = drive->sect;
2789: drive->special.b.set_geometry = 1;
2790:
2791: tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
2792: drive->bios_sect = 63;
2793: if (xparm > 1) {
2794: drive->bios_head = xparm;
2795: drive->bios_cyl = tracks / drive->bios_head;
2796: } else {
2797: while (drive->bios_cyl >= 1024) {
2798: drive->bios_head = *heads;
2799: drive->bios_cyl = tracks / drive->bios_head;
2800: if (0 == *++heads)
2801: break;
2802: }
2803: #if FAKE_FDISK_FOR_EZDRIVE
2804: if (xparm == -1) {
2805: drive->remap_0_to_1 = 1;
2806: msg = "0->1";
2807: } else
2808: #endif /* FAKE_FDISK_FOR_EZDRIVE */
2809: if (xparm == 1) {
2810: drive->sect0 = 63;
2811: drive->bios_cyl = (tracks - 1) / drive->bios_head;
2812: msg = "+63";
2813: }
2814: printk("[remap %s] ", msg);
2815: }
2816: drive->part[0].nr_sects = current_capacity(drive);
2817: printk("[%d/%d/%d]", drive->bios_cyl, drive->bios_head, drive->bios_sect);
2818: return 1;
2819: }
2820:
2821: /*
2822: * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2823: * controller that is BIOS compatible with ST-506, and thus showing up in our
2824: * BIOS table, but not register compatible, and therefore not present in CMOS.
2825: *
2826: * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2827: * drives in the system -- the ones reflected as drive 1 or 2. The first
2828: * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2829: * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2830: * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2831: * means we have an AT controller hard disk for that drive.
2832: *
2833: * Of course, there is no guarantee that either drive is actually on the
2834: * "primary" IDE interface, but we don't bother trying to sort that out here.
2835: * If a drive is not actually on the primary interface, then these parameters
2836: * will be ignored. This results in the user having to supply the logical
2837: * drive geometry as a boot parameter for each drive not on the primary i/f.
2838: *
2839: * The only "perfect" way to handle this would be to modify the setup.[cS] code
2840: * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2841: * for us during initialization. I have the necessary docs -- any takers? -ml
2842: */
2843:
2844: static void probe_cmos_for_drives (ide_hwif_t *hwif)
2845: {
2846: #ifdef __i386__
2847: extern struct drive_info_struct drive_info;
2848: byte cmos_disks, *BIOS = (byte *) &drive_info;
2849: int unit;
2850:
2851: outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2852: cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2853: /* Extract drive geometry from CMOS+BIOS if not already setup */
2854: for (unit = 0; unit < MAX_DRIVES; ++unit) {
2855: ide_drive_t *drive = &hwif->drives[unit];
2856: if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present) {
2857: drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2858: drive->head = drive->bios_head = *(BIOS+2);
2859: drive->sect = drive->bios_sect = *(BIOS+14);
2860: drive->ctl = *(BIOS+8);
2861: drive->present = 1;
2862: }
2863: BIOS += 16;
2864: }
2865: #endif
2866: }
2867:
2868: /*
2869: * This routine sets up the irq for an ide interface, and creates a new
2870: * hwgroup for the irq/hwif if none was previously assigned.
2871: *
2872: * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
2873: * interrupts completely disabled. This can be bad for interrupt latency,
2874: * but anything else has led to problems on some machines. We re-enable
2875: * interrupts as much as we can safely do in most places.
2876: */
2877: static int init_irq (ide_hwif_t *hwif)
2878: {
2879: unsigned long flags;
2880: int irq = hwif->irq;
2881: ide_hwgroup_t *hwgroup = irq_to_hwgroup[irq];
2882:
2883: save_flags(flags);
2884: cli();
2885:
2886: /*
2887: * Grab the irq if we don't already have it from a previous hwif
2888: */
2889: if (hwgroup == NULL) {
2890: if (request_irq(irq, ide_intr, SA_INTERRUPT|SA_SAMPLE_RANDOM, hwif->name)) {
2891: restore_flags(flags);
2892: printk(" -- FAILED!");
2893: return 1;
2894: }
2895: }
2896: /*
2897: * Check for serialization with ide1.
2898: * This code depends on us having already taken care of ide1.
2899: */
2900: if (hwif->serialized && hwif->name[3] == '0' && ide_hwifs[1].present)
2901: hwgroup = ide_hwifs[1].hwgroup;
2902: /*
2903: * If this is the first interface in a group,
2904: * then we need to create the hwgroup structure
2905: */
2906: if (hwgroup == NULL) {
2907: hwgroup = kmalloc (sizeof(ide_hwgroup_t), GFP_KERNEL);
2908: hwgroup->hwif = hwif->next = hwif;
2909: hwgroup->rq = NULL;
2910: hwgroup->handler = NULL;
2911: hwgroup->drive = &hwif->drives[0];
2912: hwgroup->poll_timeout = 0;
2913: init_timer(&hwgroup->timer);
2914: hwgroup->timer.function = &timer_expiry;
2915: hwgroup->timer.data = (unsigned long) hwgroup;
2916: } else {
2917: hwif->next = hwgroup->hwif->next;
2918: hwgroup->hwif->next = hwif;
2919: }
2920: hwif->hwgroup = hwgroup;
2921: irq_to_hwgroup[irq] = hwgroup;
2922:
2923: restore_flags(flags); /* safe now that hwif->hwgroup is set up */
2924:
2925: printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
2926: hwif->io_base, hwif->io_base+7, hwif->ctl_port, irq);
2927: if (hwgroup->hwif != hwif)
2928: printk(" (serialized with %s)", hwgroup->hwif->name);
2929: printk("\n");
2930: return 0;
2931: }
2932:
2933: static struct file_operations ide_fops = {
2934: NULL, /* lseek - default */
2935: block_read, /* read - general block-dev read */
2936: block_write, /* write - general block-dev write */
2937: NULL, /* readdir - bad */
2938: NULL, /* select */
2939: ide_ioctl, /* ioctl */
2940: NULL, /* mmap */
2941: ide_open, /* open */
2942: ide_release, /* release */
2943: block_fsync /* fsync */
2944: ,NULL, /* fasync */
2945: ide_check_media_change, /* check_media_change */
2946: revalidate_disk /* revalidate */
2947: };
2948:
2949: #ifdef CONFIG_PCI
2950: #if defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON)
2951:
2952: typedef void (ide_pci_init_proc_t)(byte, byte);
2953:
2954: /*
2955: * ide_probe_pci() scans PCI for a specific vendor/device function,
2956: * and invokes the supplied init routine for each instance detected.
2957: */
2958: static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
2959: {
2960: unsigned long flags;
2961: unsigned index;
2962: byte fn, bus;
2963:
2964: save_flags(flags);
2965: cli();
2966: for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
2967: init (bus, fn + func_adj);
2968: }
2969: restore_flags(flags);
2970: }
2971:
2972: #endif /* defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON) */
2973: #endif /* CONFIG_PCI */
2974:
2975: /*
2976: * ide_init_pci() finds/initializes "known" PCI IDE interfaces
2977: *
2978: * This routine should ideally be using pcibios_find_class() to find
2979: * all IDE interfaces, but that function causes some systems to "go weird".
2980: */
2981: static void probe_for_hwifs (void)
2982: {
2983: #ifdef CONFIG_PCI
2984: /*
2985: * Find/initialize PCI IDE interfaces
2986: */
2987: if (pcibios_present()) {
2988: #ifdef CONFIG_BLK_DEV_RZ1000
2989: ide_pci_init_proc_t init_rz1000;
2990: ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
2991: #endif /* CONFIG_BLK_DEV_RZ1000 */
2992: #ifdef CONFIG_BLK_DEV_TRITON
2993: /*
2994: * Apparently the BIOS32 services on Intel motherboards are
2995: * buggy and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
2996: * So instead, we search for PCI_DEVICE_ID_INTEL_82371_0,
2997: * and then add 1.
2998: */
2999: ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
3000: #endif /* CONFIG_BLK_DEV_TRITON */
3001: }
3002: #endif /* CONFIG_PCI */
3003: #ifdef CONFIG_BLK_DEV_CMD640
3004: {
3005: extern void ide_probe_for_cmd640x (void);
3006: ide_probe_for_cmd640x();
3007: }
3008: #endif
3009: }
3010:
3011: /*
3012: * This is gets invoked once during initialization, to set *everything* up
3013: */
3014: int ide_init (void)
3015: {
3016: int h;
3017:
3018: init_ide_data ();
3019: /*
3020: * Probe for special "known" interface chipsets
3021: */
3022: probe_for_hwifs ();
3023:
3024: /*
3025: * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
3026: */
3027: for (h = 0; h < MAX_HWIFS; ++h) {
3028: ide_hwif_t *hwif = &ide_hwifs[h];
3029: if (!hwif->noprobe) {
3030: if (hwif->io_base == HD_DATA)
3031: probe_cmos_for_drives (hwif);
3032: probe_for_drives (hwif);
3033: }
3034: if (hwif->present) {
3035: if (!hwif->irq) {
3036: if (!(hwif->irq = default_irqs[h])) {
3037: printk("%s: DISABLED, NO IRQ\n", hwif->name);
3038: hwif->present = 0;
3039: continue;
3040: }
3041: }
3042: #ifdef CONFIG_BLK_DEV_HD
3043: if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
3044: printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
3045: hwif->present = 0;
3046: }
3047: #endif /* CONFIG_BLK_DEV_HD */
3048: }
3049: }
3050:
3051: /*
3052: * Now we try to set up irqs and major devices for what was found
3053: */
3054: for (h = MAX_HWIFS-1; h >= 0; --h) {
3055: void (*rfn)(void);
3056: ide_hwif_t *hwif = &ide_hwifs[h];
3057: if (!hwif->present)
3058: continue;
3059: hwif->present = 0; /* we set it back to 1 if all is ok below */
3060: switch (hwif->major) {
3061: case IDE0_MAJOR: rfn = &do_ide0_request; break;
3062: case IDE1_MAJOR: rfn = &do_ide1_request; break;
3063: case IDE2_MAJOR: rfn = &do_ide2_request; break;
3064: case IDE3_MAJOR: rfn = &do_ide3_request; break;
3065: default:
3066: printk("%s: request_fn NOT DEFINED\n", hwif->name);
3067: continue;
3068: }
3069: if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3070: printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3071: } else if (init_irq (hwif)) {
3072: printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3073: (void) unregister_blkdev (hwif->major, hwif->name);
3074: } else {
3075: init_gendisk(hwif);
3076: blk_dev[hwif->major].request_fn = rfn;
3077: read_ahead[hwif->major] = 8; /* (4kB) */
3078: hwif->present = 1; /* success */
3079: }
3080: }
3081:
3082: #ifdef CONFIG_BLK_DEV_IDETAPE
3083: idetape_register_chrdev(); /* Register character device interface to the ide tape */
3084: #endif /* CONFIG_BLK_DEV_IDETAPE */
3085:
3086: return 0;
3087: }
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