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1.1 root 1: /*
2: * linux/drivers/block/ide.c Version 5.53 Jun 24, 1997
3: *
4: * Copyright (C) 1994-1996 Linus Torvalds & authors (see below)
5: */
6: #define _IDE_C /* needed by <linux/blk.h> */
7:
8: /*
9: * Maintained by Mark Lord <[email protected]>
10: * and Gadi Oxman <[email protected]>
11: *
12: * This is the multiple IDE interface driver, as evolved from hd.c.
13: * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).
14: * There can be up to two drives per interface, as per the ATA-2 spec.
15: *
16: * Primary: ide0, port 0x1f0; major=3; hda is minor=0; hdb is minor=64
17: * Secondary: ide1, port 0x170; major=22; hdc is minor=0; hdd is minor=64
18: * Tertiary: ide2, port 0x???; major=33; hde is minor=0; hdf is minor=64
19: * Quaternary: ide3, port 0x???; major=34; hdg is minor=0; hdh is minor=64
20: *
21: * It is easy to extend ide.c to handle more than four interfaces:
22: *
23: * Change the MAX_HWIFS constant in ide.h.
24: *
25: * Define some new major numbers (in major.h), and insert them into
26: * the ide_hwif_to_major table in ide.c.
27: *
28: * Fill in the extra values for the new interfaces into the two tables
29: * inside ide.c: default_io_base[] and default_irqs[].
30: *
31: * Create the new request handlers by cloning "do_ide3_request()"
32: * for each new interface, and add them to the switch statement
33: * in the ide_init() function in ide.c.
34: *
35: * Recompile, create the new /dev/ entries, and it will probably work.
36: *
37: * From hd.c:
38: * |
39: * | It traverses the request-list, using interrupts to jump between functions.
40: * | As nearly all functions can be called within interrupts, we may not sleep.
41: * | Special care is recommended. Have Fun!
42: * |
43: * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
44: * |
45: * | Thanks to Branko Lankester, [email protected], who found a bug
46: * | in the early extended-partition checks and added DM partitions.
47: * |
48: * | Early work on error handling by Mika Liljeberg ([email protected]).
49: * |
50: * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
51: * | and general streamlining by Mark Lord ([email protected]).
52: *
53: * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
54: *
55: * Mark Lord ([email protected]) (IDE Perf.Pkg)
56: * Delman Lee ([email protected]) ("Mr. atdisk2")
57: * Scott Snyder ([email protected]) (ATAPI IDE cd-rom)
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: * removable 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 removable
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: * Version 5.29 fixed non-IDE check for too many physical heads
209: * don't use LBA if capacity is smaller than CHS
210: * Version 5.30 remove real_devices kludge, formerly used by genhd.c
211: * Version 5.32 change "KB" to "kB"
212: * fix serialize (was broken in kernel 1.3.72)
213: * add support for "hdparm -I"
214: * use common code for disk/tape/cdrom IDE_DRIVE_CMDs
215: * add support for Promise DC4030VL caching card
216: * improved serialize support
217: * put partition check back into alphabetical order
218: * add config option for PCMCIA baggage
219: * try to make PCMCIA support safer to use
220: * improve security on ioctls(): all are suser() only
221: * Version 5.33 improve handling of HDIO_DRIVE_CMDs that read data
222: * Version 5.34 fix irq-sharing problem from 5.33
223: * fix cdrom ioctl problem from 5.33
224: * Version 5.35 cosmetic changes
225: * fix cli() problem in try_to_identify()
226: * Version 5.36 fixes to optional PCMCIA support
227: * Version 5.37 don't use DMA when "noautotune" is specified
228: * Version 5.37a (go) fix shared irq probing (was broken in kernel 1.3.72)
229: * call unplug_device() from ide_do_drive_cmd()
230: * Version 5.38 add "hdx=none" option, courtesy of Joel Maslak
231: * mask drive irq after use, if sharing with another hwif
232: * add code to help debug weird cmd640 problems
233: * Version 5.39 fix horrible error in earlier irq sharing "fix"
234: * Version 5.40 fix serialization -- was broken in 5.39
235: * help sharing by masking device irq after probing
236: * Version 5.41 more fixes to irq sharing/serialize detection
237: * disable io_32bit by default on drive reset
238: * Version 5.42 simplify irq-masking after probe
239: * fix NULL pointer deref in save_match()
240: * Version 5.43 Ugh.. unexpected_intr is back: try to exterminate it
241: * Version 5.44 Fix for "irq probe failed" on cmd640
242: * change path on message regarding MAKEDEV.ide
243: * add a throttle to the unexpected_intr() messages
244: * Version 5.45 fix ugly parameter parsing bugs (thanks Derek)
245: * include Gadi's magic fix for cmd640 unexpected_intr
246: * include mc68000 patches from Geert Uytterhoeven
247: * add Gadi's fix for PCMCIA cdroms
248: * Version 5.46 remove the mc68000 #ifdefs for 2.0.x
249: * Version 5.47 fix set_tune race condition
250: * fix bug in earlier PCMCIA cdrom update
251: * Version 5.48 if def'd, invoke CMD640_DUMP_REGS when irq probe fails
252: * lengthen the do_reset1() pulse, for laptops
253: * add idebus=xx parameter for cmd640 and ali chipsets
254: * no_unmask flag now per-drive instead of per-hwif
255: * fix tune_req so that it gets done immediately
256: * fix missing restore_flags() in ide_ioctl
257: * prevent use of io_32bit on cmd640 with no prefetch
258: * Version 5.49 fix minor quirks in probing routines
259: * Version 5.50 allow values as small as 20 for idebus=
260: * Version 5.51 force non io_32bit in drive_cmd_intr()
261: * change delay_10ms() to delay_50ms() to fix problems
262: * Version 5.52 fix incorrect invalidation of removable devices
263: * add "hdx=slow" command line option
264: * Version 5.53 add ATAPI floppy drive support
265: * change default media for type 0 to floppy
266: * add support for Exabyte Nest
267: * add missing set_blocksize() in revalidate_disk()
268: * handle bad status bit sequencing in ide_wait_stat()
269: * support partition table translations with 255 heads
270: * probe all interfaces by default
271: * add probe for the i82371AB chipset
272: * acknowledge media change on removable drives
273: * add work-around for BMI drives
274: * remove "LBA" from boot messages
275: * Version 5.53.1 add UDMA "CRC retry" support
276: * Version 5.53.2 add Promise/33 auto-detection and DMA support
277: * fix MC_ERR handling
278: * fix mis-detection of NEC cdrom as floppy
279: * issue ATAPI reset and re-probe after "no response"
280: *
281: * Some additional driver compile-time options are in ide.h
282: *
283: * To do, in likely order of completion:
284: * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
285: */
286:
287: #undef REALLY_SLOW_IO /* most systems can safely undef this */
288:
289: #include <linux/config.h>
290: #include <linux/types.h>
291: #include <linux/string.h>
292: #include <linux/kernel.h>
293: #include <linux/delay.h>
294: #include <linux/timer.h>
295: #include <linux/mm.h>
296: #include <linux/ioport.h>
297: #include <linux/interrupt.h>
298: #include <linux/major.h>
299: #include <linux/blkdev.h>
300: #include <linux/errno.h>
301: #include <linux/hdreg.h>
302: #include <linux/genhd.h>
303: #include <linux/malloc.h>
304:
305: #include <asm/byteorder.h>
306: #include <asm/irq.h>
307: #include <asm/segment.h>
308: #include <asm/io.h>
309:
310: #ifdef CONFIG_PCI
311: #include <linux/bios32.h>
312: #include <linux/pci.h>
313: #endif /* CONFIG_PCI */
314:
315: #include "ide.h"
316: #include "ide_modes.h"
317:
318: #ifdef CONFIG_BLK_DEV_PROMISE
319: #include "promise.h"
320: #define IS_PROMISE_DRIVE (HWIF(drive)->chipset == ide_promise)
321: #else
322: #define IS_PROMISE_DRIVE (0) /* auto-NULLs out Promise code */
323: #endif /* CONFIG_BLK_DEV_PROMISE */
324:
325: static const byte ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
326: static const unsigned short default_io_base[MAX_HWIFS] = {0x1f0, 0x170, 0x1e8, 0x168};
327: static const byte default_irqs[MAX_HWIFS] = {14, 15, 11, 10};
328: static int idebus_parameter; /* holds the "idebus=" parameter */
329: static int system_bus_speed; /* holds what we think is VESA/PCI bus speed */
330:
331: /*
332: * This is declared extern in ide.h, for access by other IDE modules:
333: */
334: ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */
335:
336: #if (DISK_RECOVERY_TIME > 0)
337: /*
338: * For really screwy hardware (hey, at least it *can* be used with Linux)
339: * we can enforce a minimum delay time between successive operations.
340: */
341: static unsigned long read_timer(void)
342: {
343: unsigned long t, flags;
344: int i;
345:
346: save_flags(flags);
347: cli();
348: t = jiffies * 11932;
349: outb_p(0, 0x43);
350: i = inb_p(0x40);
351: i |= inb(0x40) << 8;
352: restore_flags(flags);
353: return (t - i);
354: }
355:
356: static void set_recovery_timer (ide_hwif_t *hwif)
357: {
358: hwif->last_time = read_timer();
359: }
360: #define SET_RECOVERY_TIMER(drive) set_recovery_timer (drive)
361:
362: #else
363:
364: #define SET_RECOVERY_TIMER(drive)
365:
366: #endif /* DISK_RECOVERY_TIME */
367:
368:
369: /*
370: * Do not even *think* about calling this!
371: */
372: static void init_hwif_data (unsigned int index)
373: {
374: byte *p;
375: unsigned int unit;
376: ide_hwif_t *hwif = &ide_hwifs[index];
377:
378: /* bulk initialize hwif & drive info with zeros */
379: p = ((byte *) hwif) + sizeof(ide_hwif_t);
380: do {
381: *--p = 0;
382: } while (p > (byte *) hwif);
383:
384: /* fill in any non-zero initial values */
385: hwif->index = index;
386: hwif->io_base = default_io_base[index];
387: hwif->ctl_port = hwif->io_base ? hwif->io_base+0x206 : 0x000;
388: #ifdef CONFIG_BLK_DEV_HD
389: if (hwif->io_base == HD_DATA)
390: hwif->noprobe = 1; /* may be overridden by ide_setup() */
391: #endif /* CONFIG_BLK_DEV_HD */
392: hwif->major = ide_hwif_to_major[index];
393: hwif->name[0] = 'i';
394: hwif->name[1] = 'd';
395: hwif->name[2] = 'e';
396: hwif->name[3] = '0' + index;
397: #ifdef CONFIG_BLK_DEV_IDETAPE
398: hwif->tape_drive = NULL;
399: #endif /* CONFIG_BLK_DEV_IDETAPE */
400: for (unit = 0; unit < MAX_DRIVES; ++unit) {
401: ide_drive_t *drive = &hwif->drives[unit];
402:
403: drive->select.all = (unit<<4)|0xa0;
404: drive->hwif = hwif;
405: drive->ctl = 0x08;
406: drive->ready_stat = READY_STAT;
407: drive->bad_wstat = BAD_W_STAT;
408: drive->special.b.recalibrate = 1;
409: drive->special.b.set_geometry = 1;
410: drive->name[0] = 'h';
411: drive->name[1] = 'd';
412: drive->name[2] = 'a' + (index * MAX_DRIVES) + unit;
413: }
414: }
415:
416: /*
417: * init_ide_data() sets reasonable default values into all fields
418: * of all instances of the hwifs and drives, but only on the first call.
419: * Subsequent calls have no effect (they don't wipe out anything).
420: *
421: * This routine is normally called at driver initialization time,
422: * but may also be called MUCH earlier during kernel "command-line"
423: * parameter processing. As such, we cannot depend on any other parts
424: * of the kernel (such as memory allocation) to be functioning yet.
425: *
426: * This is too bad, as otherwise we could dynamically allocate the
427: * ide_drive_t structs as needed, rather than always consuming memory
428: * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
429: */
430: #define MAGIC_COOKIE 0x12345678
431: static void init_ide_data (void)
432: {
433: unsigned int index;
434: static unsigned long magic_cookie = MAGIC_COOKIE;
435:
436: if (magic_cookie != MAGIC_COOKIE)
437: return; /* already initialized */
438: magic_cookie = 0;
439:
440: for (index = 0; index < MAX_HWIFS; ++index)
441: init_hwif_data(index);
442:
443: idebus_parameter = 0;
444: system_bus_speed = 0;
445: }
446:
447: /*
448: * ide_system_bus_speed() returns what we think is the system VESA/PCI
449: * bus speed (in Mhz). This is used for calculating interface PIO timings.
450: * The default is 40 for known PCI systems, 50 otherwise.
451: * The "idebus=xx" parameter can be used to override this value.
452: * The actual value to be used is computed/displayed the first time through.
453: */
454: int ide_system_bus_speed (void)
455: {
456: if (!system_bus_speed) {
457: if (idebus_parameter)
458: system_bus_speed = idebus_parameter; /* user supplied value */
459: #ifdef CONFIG_PCI
460: else if (pcibios_present())
461: system_bus_speed = 40; /* safe default value for PCI */
462: #endif /* CONFIG_PCI */
463: else
464: system_bus_speed = 50; /* safe default value for VESA and PCI */
465: printk("ide: Assuming %dMhz system bus speed for PIO modes; override with idebus=xx\n", system_bus_speed);
466: }
467: return system_bus_speed;
468: }
469:
470: #if SUPPORT_VLB_SYNC
471: /*
472: * Some localbus EIDE interfaces require a special access sequence
473: * when using 32-bit I/O instructions to transfer data. We call this
474: * the "vlb_sync" sequence, which consists of three successive reads
475: * of the sector count register location, with interrupts disabled
476: * to ensure that the reads all happen together.
477: */
478: static inline void do_vlb_sync (unsigned short port) {
479: (void) inb (port);
480: (void) inb (port);
481: (void) inb (port);
482: }
483: #endif /* SUPPORT_VLB_SYNC */
484:
485: /*
486: * This is used for most PIO data transfers *from* the IDE interface
487: */
488: void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
489: {
490: unsigned short io_base = HWIF(drive)->io_base;
491: unsigned short data_reg = io_base+IDE_DATA_OFFSET;
492: byte io_32bit = drive->io_32bit;
493:
494: if (io_32bit) {
495: #if SUPPORT_VLB_SYNC
496: if (io_32bit & 2) {
497: cli();
498: do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
499: insl(data_reg, buffer, wcount);
500: if (drive->unmask)
501: sti();
502: } else
503: #endif /* SUPPORT_VLB_SYNC */
504: insl(data_reg, buffer, wcount);
505: } else {
506: #if SUPPORT_SLOW_DATA_PORTS
507: if (drive->slow) {
508: unsigned short *ptr = (unsigned short *) buffer;
509: while (wcount--) {
510: *ptr++ = inw_p(data_reg);
511: *ptr++ = inw_p(data_reg);
512: }
513: } else
514: #endif /* SUPPORT_SLOW_DATA_PORTS */
515: insw(data_reg, buffer, wcount<<1);
516: }
517: }
518:
519: /*
520: * This is used for most PIO data transfers *to* the IDE interface
521: */
522: void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
523: {
524: unsigned short io_base = HWIF(drive)->io_base;
525: unsigned short data_reg = io_base+IDE_DATA_OFFSET;
526: byte io_32bit = drive->io_32bit;
527:
528: if (io_32bit) {
529: #if SUPPORT_VLB_SYNC
530: if (io_32bit & 2) {
531: cli();
532: do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
533: outsl(data_reg, buffer, wcount);
534: if (drive->unmask)
535: sti();
536: } else
537: #endif /* SUPPORT_VLB_SYNC */
538: outsl(data_reg, buffer, wcount);
539: } else {
540: #if SUPPORT_SLOW_DATA_PORTS
541: if (drive->slow) {
542: unsigned short *ptr = (unsigned short *) buffer;
543: while (wcount--) {
544: outw_p(*ptr++, data_reg);
545: outw_p(*ptr++, data_reg);
546: }
547: } else
548: #endif /* SUPPORT_SLOW_DATA_PORTS */
549: outsw(data_reg, buffer, wcount<<1);
550: }
551: }
552:
553: /*
554: * The following routines are mainly used by the ATAPI drivers.
555: *
556: * These routines will round up any request for an odd number of bytes,
557: * so if an odd bytecount is specified, be sure that there's at least one
558: * extra byte allocated for the buffer.
559: */
560: void atapi_input_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount)
561: {
562: ++bytecount;
563: ide_input_data (drive, buffer, bytecount / 4);
564: if ((bytecount & 0x03) >= 2)
565: insw (IDE_DATA_REG, ((byte *)buffer) + (bytecount & ~0x03), 1);
566: }
567:
568: void atapi_output_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount)
569: {
570: ++bytecount;
571: ide_output_data (drive, buffer, bytecount / 4);
572: if ((bytecount & 0x03) >= 2)
573: outsw (IDE_DATA_REG, ((byte *)buffer) + (bytecount & ~0x03), 1);
574: }
575:
576: /*
577: * This should get invoked any time we exit the driver to
578: * wait for an interrupt response from a drive. handler() points
579: * at the appropriate code to handle the next interrupt, and a
580: * timer is started to prevent us from waiting forever in case
581: * something goes wrong (see the timer_expiry() handler later on).
582: */
583: void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout)
584: {
585: ide_hwgroup_t *hwgroup = HWGROUP(drive);
586: #ifdef DEBUG
587: if (hwgroup->handler != NULL) {
588: printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
589: drive->name, hwgroup->handler, handler);
590: }
591: #endif
592: hwgroup->handler = handler;
593: hwgroup->timer.expires = jiffies + timeout;
594: add_timer(&(hwgroup->timer));
595: }
596:
597: /*
598: * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
599: * value for this drive (from its reported identification information).
600: *
601: * Returns: 1 if lba_capacity looks sensible
602: * 0 otherwise
603: */
604: static int lba_capacity_is_ok (struct hd_driveid *id)
605: {
606: unsigned long lba_sects = id->lba_capacity;
607: unsigned long chs_sects = id->cyls * id->heads * id->sectors;
608: unsigned long _10_percent = chs_sects / 10;
609:
610: /* very large drives (8GB+) may lie about the number of cylinders */
611: if (id->cyls == 16383 && id->heads == 16 && id->sectors == 63 && lba_sects > chs_sects) {
612: id->cyls = lba_sects / (16 * 63); /* correct cyls */
613: return 1; /* lba_capacity is our only option */
614: }
615: /* perform a rough sanity check on lba_sects: within 10% is "okay" */
616: if ((lba_sects - chs_sects) < _10_percent)
617: return 1; /* lba_capacity is good */
618:
619: /* some drives have the word order reversed */
620: lba_sects = (lba_sects << 16) | (lba_sects >> 16);
621: if ((lba_sects - chs_sects) < _10_percent) {
622: id->lba_capacity = lba_sects; /* fix it */
623: return 1; /* lba_capacity is (now) good */
624: }
625: return 0; /* lba_capacity value is bad */
626: }
627:
628: /*
629: * current_capacity() returns the capacity (in sectors) of a drive
630: * according to its current geometry/LBA settings.
631: */
632: static unsigned long current_capacity (ide_drive_t *drive)
633: {
634: struct hd_driveid *id = drive->id;
635: unsigned long capacity = drive->cyl * drive->head * drive->sect;
636:
637: if (!drive->present)
638: return 0;
639: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
640: if (drive->media == ide_floppy)
641: return idefloppy_capacity(drive);
642: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
643: if (drive->media != ide_disk)
644: return 0x7fffffff; /* cdrom or tape */
645: drive->select.b.lba = 0;
646: /* Determine capacity, and use LBA if the drive properly supports it */
647: if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
648: if (id->lba_capacity >= capacity) {
649: drive->cyl = id->lba_capacity / (drive->head * drive->sect);
650: capacity = id->lba_capacity;
651: drive->select.b.lba = 1;
652: }
653: }
654: return (capacity - drive->sect0);
655: }
656:
657: /*
658: * ide_geninit() is called exactly *once* for each major, from genhd.c,
659: * at the beginning of the initial partition check for the drives.
660: */
661: static void ide_geninit (struct gendisk *gd)
662: {
663: unsigned int unit;
664: ide_hwif_t *hwif = gd->real_devices;
665:
666: for (unit = 0; unit < gd->nr_real; ++unit) {
667: ide_drive_t *drive = &hwif->drives[unit];
668: #ifdef CONFIG_BLK_DEV_IDECD
669: if (drive->present && drive->media == ide_cdrom)
670: ide_cdrom_setup(drive);
671: #endif /* CONFIG_BLK_DEV_IDECD */
672: #ifdef CONFIG_BLK_DEV_IDETAPE
673: if (drive->present && drive->media == ide_tape)
674: idetape_setup(drive);
675: #endif /* CONFIG_BLK_DEV_IDETAPE */
676: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
677: if (drive->present && drive->media == ide_floppy)
678: idefloppy_setup(drive);
679: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
680: drive->part[0].nr_sects = current_capacity(drive);
681: if (!drive->present || (drive->media != ide_disk && drive->media != ide_floppy) ||
682: !drive->part[0].nr_sects) {
683: drive->part[0].start_sect = -1; /* skip partition check */
684: }
685: }
686: }
687:
688: /*
689: * init_gendisk() (as opposed to ide_geninit) is called for each major device,
690: * after probing for drives, to allocate partition tables and other data
691: * structures needed for the routines in genhd.c. ide_geninit() gets called
692: * somewhat later, during the partition check.
693: */
694: static void init_gendisk (ide_hwif_t *hwif)
695: {
696: struct gendisk *gd, **gdp;
697: unsigned int unit, units, minors;
698: int *bs;
699:
700: /* figure out maximum drive number on the interface */
701: for (units = MAX_DRIVES; units > 0; --units) {
702: if (hwif->drives[units-1].present)
703: break;
704: }
705: minors = units * (1<<PARTN_BITS);
706: gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
707: gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
708: gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
709: bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
710:
711: memset(gd->part, 0, minors * sizeof(struct hd_struct));
712:
713: /* cdroms and msdos f/s are examples of non-1024 blocksizes */
714: blksize_size[hwif->major] = bs;
715: for (unit = 0; unit < minors; ++unit)
716: *bs++ = BLOCK_SIZE;
717:
718: for (unit = 0; unit < units; ++unit)
719: hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
720:
721: gd->major = hwif->major; /* our major device number */
722: gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
723: gd->minor_shift = PARTN_BITS; /* num bits for partitions */
724: gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
725: gd->max_nr = units; /* max num real drives */
726: gd->nr_real = units; /* current num real drives */
727: gd->init = ide_geninit; /* initialization function */
728: gd->real_devices= hwif; /* ptr to internal data */
729: gd->next = NULL; /* linked list of major devs */
730:
731: for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next)) ;
732: hwif->gd = *gdp = gd; /* link onto tail of list */
733: }
734:
735: static void do_reset1 (ide_drive_t *, int); /* needed below */
736:
737: #ifdef CONFIG_BLK_DEV_IDEATAPI
738: /*
739: * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
740: * during an atapi drive reset operation. If the drive has not yet responded,
741: * and we have not yet hit our maximum waiting time, then the timer is restarted
742: * for another 50ms.
743: */
744: static void atapi_reset_pollfunc (ide_drive_t *drive)
745: {
746: ide_hwgroup_t *hwgroup = HWGROUP(drive);
747: byte stat;
748:
749: OUT_BYTE (drive->select.all, IDE_SELECT_REG);
750: udelay (10);
751:
752: if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
753: printk("%s: ATAPI reset complete\n", drive->name);
754: } else {
755: if (jiffies < hwgroup->poll_timeout) {
756: ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
757: return; /* continue polling */
758: }
759: hwgroup->poll_timeout = 0; /* end of polling */
760: printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
761: do_reset1 (drive, 1); /* do it the old fashioned way */
762: return;
763: }
764: hwgroup->poll_timeout = 0; /* done polling */
765: }
766: #endif /* CONFIG_BLK_DEV_IDEATAPI */
767:
768: /*
769: * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
770: * during an ide reset operation. If the drives have not yet responded,
771: * and we have not yet hit our maximum waiting time, then the timer is restarted
772: * for another 50ms.
773: */
774: static void reset_pollfunc (ide_drive_t *drive)
775: {
776: ide_hwgroup_t *hwgroup = HWGROUP(drive);
777: ide_hwif_t *hwif = HWIF(drive);
778: byte tmp;
779:
780: if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
781: if (jiffies < hwgroup->poll_timeout) {
782: ide_set_handler (drive, &reset_pollfunc, HZ/20);
783: return; /* continue polling */
784: }
785: printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
786: } else {
787: printk("%s: reset: ", hwif->name);
788: if ((tmp = GET_ERR()) == 1)
789: printk("success\n");
790: else {
791: #if FANCY_STATUS_DUMPS
792: printk("master: ");
793: switch (tmp & 0x7f) {
794: case 1: printk("passed");
795: break;
796: case 2: printk("formatter device error");
797: break;
798: case 3: printk("sector buffer error");
799: break;
800: case 4: printk("ECC circuitry error");
801: break;
802: case 5: printk("controlling MPU error");
803: break;
804: default:printk("error (0x%02x?)", tmp);
805: }
806: if (tmp & 0x80)
807: printk("; slave: failed");
808: printk("\n");
809: #else
810: printk("failed\n");
811: #endif /* FANCY_STATUS_DUMPS */
812: }
813: }
814: hwgroup->poll_timeout = 0; /* done polling */
815: }
816:
817: /*
818: * do_reset1() attempts to recover a confused drive by resetting it.
819: * Unfortunately, resetting a disk drive actually resets all devices on
820: * the same interface, so it can really be thought of as resetting the
821: * interface rather than resetting the drive.
822: *
823: * ATAPI devices have their own reset mechanism which allows them to be
824: * individually reset without clobbering other devices on the same interface.
825: *
826: * Unfortunately, the IDE interface does not generate an interrupt to let
827: * us know when the reset operation has finished, so we must poll for this.
828: * Equally poor, though, is the fact that this may a very long time to complete,
829: * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
830: * we set a timer to poll at 50ms intervals.
831: */
832: static void do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
833: {
834: unsigned int unit;
835: unsigned long flags;
836: ide_hwif_t *hwif = HWIF(drive);
837: ide_hwgroup_t *hwgroup = HWGROUP(drive);
838:
839: save_flags(flags);
840: cli(); /* Why ? */
841:
842: #ifdef CONFIG_BLK_DEV_IDEATAPI
843: /* For an ATAPI device, first try an ATAPI SRST. */
844: if (drive->media != ide_disk) {
845: if (!do_not_try_atapi) {
846: if (!drive->keep_settings) {
847: drive->unmask = 0;
848: drive->io_32bit = 0;
849: }
850: OUT_BYTE (drive->select.all, IDE_SELECT_REG);
851: udelay (20);
852: OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
853: hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
854: ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
855: restore_flags (flags);
856: return;
857: }
858: }
859: #endif /* CONFIG_BLK_DEV_IDEATAPI */
860:
861: /*
862: * First, reset any device state data we were maintaining
863: * for any of the drives on this interface.
864: */
865: for (unit = 0; unit < MAX_DRIVES; ++unit) {
866: ide_drive_t *rdrive = &hwif->drives[unit];
867: #ifdef CONFIG_BLK_DEV_IDETAPE
868: if (rdrive->media == ide_tape)
869: rdrive->tape.reset_issued = 1;
870: #endif /* CONFIG_BLK_DEV_IDETAPE */
871: rdrive->special.all = 0;
872: rdrive->special.b.set_geometry = 1;
873: rdrive->special.b.recalibrate = 1;
874: if (OK_TO_RESET_CONTROLLER)
875: rdrive->mult_count = 0;
876: if (!rdrive->keep_settings) {
877: rdrive->mult_req = 0;
878: rdrive->unmask = 0;
879: rdrive->io_32bit = 0;
880: if (rdrive->using_dma) {
881: rdrive->using_dma = 0;
882: printk("%s: disabled DMA\n", rdrive->name);
883: }
884: }
885: if (rdrive->mult_req != rdrive->mult_count)
886: rdrive->special.b.set_multmode = 1;
887: }
888:
889: #if OK_TO_RESET_CONTROLLER
890: /*
891: * Note that we also set nIEN while resetting the device,
892: * to mask unwanted interrupts from the interface during the reset.
893: * However, due to the design of PC hardware, this will cause an
894: * immediate interrupt due to the edge transition it produces.
895: * This single interrupt gives us a "fast poll" for drives that
896: * recover from reset very quickly, saving us the first 50ms wait time.
897: */
898: OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
899: udelay(10); /* more than enough time */
900: OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
901: udelay(10); /* more than enough time */
902: hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
903: ide_set_handler (drive, &reset_pollfunc, HZ/20);
904: #endif /* OK_TO_RESET_CONTROLLER */
905:
906: restore_flags (flags);
907: }
908:
909: /*
910: * ide_do_reset() is the entry point to the drive/interface reset code.
911: */
912: void ide_do_reset (ide_drive_t *drive)
913: {
914: do_reset1 (drive, 0);
915: #ifdef CONFIG_BLK_DEV_IDETAPE
916: if (drive->media == ide_tape)
917: drive->tape.reset_issued=1;
918: #endif /* CONFIG_BLK_DEV_IDETAPE */
919: }
920:
921: /*
922: * Clean up after success/failure of an explicit drive cmd
923: */
924: void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
925: {
926: unsigned long flags;
927: struct request *rq = HWGROUP(drive)->rq;
928:
929: if (rq->cmd == IDE_DRIVE_CMD) {
930: byte *args = (byte *) rq->buffer;
931: rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
932: if (args) {
933: args[0] = stat;
934: args[1] = err;
935: args[2] = IN_BYTE(IDE_NSECTOR_REG);
936: }
937: }
938: save_flags(flags);
939: cli();
940: blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
941: HWGROUP(drive)->rq = NULL;
942: rq->rq_status = RQ_INACTIVE;
943: if (rq->sem != NULL)
944: up(rq->sem);
945: restore_flags(flags);
946: }
947:
948: /*
949: * Error reporting, in human readable form (luxurious, but a memory hog).
950: */
951: byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
952: {
953: unsigned long flags;
954: byte err = 0;
955:
956: save_flags (flags);
957: sti();
958: printk("%s: %s: status=0x%02x", drive->name, msg, stat);
959: #if FANCY_STATUS_DUMPS
960: if (drive->media == ide_disk) {
961: printk(" { ");
962: if (stat & BUSY_STAT)
963: printk("Busy ");
964: else {
965: if (stat & READY_STAT) printk("DriveReady ");
966: if (stat & WRERR_STAT) printk("DeviceFault ");
967: if (stat & SEEK_STAT) printk("SeekComplete ");
968: if (stat & DRQ_STAT) printk("DataRequest ");
969: if (stat & ECC_STAT) printk("CorrectedError ");
970: if (stat & INDEX_STAT) printk("Index ");
971: if (stat & ERR_STAT) printk("Error ");
972: }
973: printk("}");
974: }
975: #endif /* FANCY_STATUS_DUMPS */
976: printk("\n");
977: if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
978: err = GET_ERR();
979: printk("%s: %s: error=0x%02x", drive->name, msg, err);
980: #if FANCY_STATUS_DUMPS
981: if (drive->media == ide_disk) {
982: printk(" { ");
983: if (err & ICRC_ERR) printk((err & ABRT_ERR) ? "BadCRC " : "BadSector ");
984: if (err & ECC_ERR) printk("UncorrectableError ");
985: if (err & ID_ERR) printk("SectorIdNotFound ");
986: if (err & ABRT_ERR) printk("DriveStatusError ");
987: if (err & TRK0_ERR) printk("TrackZeroNotFound ");
988: if (err & MARK_ERR) printk("AddrMarkNotFound ");
989: printk("}");
990: if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
991: byte cur = IN_BYTE(IDE_SELECT_REG);
992: if (cur & 0x40) { /* using LBA? */
993: printk(", LBAsect=%ld", (unsigned long)
994: ((cur&0xf)<<24)
995: |(IN_BYTE(IDE_HCYL_REG)<<16)
996: |(IN_BYTE(IDE_LCYL_REG)<<8)
997: | IN_BYTE(IDE_SECTOR_REG));
998: } else {
999: printk(", CHS=%d/%d/%d",
1000: (IN_BYTE(IDE_HCYL_REG)<<8) +
1001: IN_BYTE(IDE_LCYL_REG),
1002: cur & 0xf,
1003: IN_BYTE(IDE_SECTOR_REG));
1004: }
1005: if (HWGROUP(drive)->rq)
1006: printk(", sector=%ld", HWGROUP(drive)->rq->sector);
1007: }
1008: }
1009: #endif /* FANCY_STATUS_DUMPS */
1010: printk("\n");
1011: }
1012: restore_flags (flags);
1013: return err;
1014: }
1015:
1016: /*
1017: * try_to_flush_leftover_data() is invoked in response to a drive
1018: * unexpectedly having its DRQ_STAT bit set. As an alternative to
1019: * resetting the drive, this routine tries to clear the condition
1020: * by read a sector's worth of data from the drive. Of course,
1021: * this may not help if the drive is *waiting* for data from *us*.
1022: */
1023: static void try_to_flush_leftover_data (ide_drive_t *drive)
1024: {
1025: int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
1026:
1027: while (i > 0) {
1028: unsigned long buffer[16];
1029: unsigned int wcount = (i > 16) ? 16 : i;
1030: i -= wcount;
1031: ide_input_data (drive, buffer, wcount);
1032: }
1033: }
1034:
1035: /*
1036: * ide_error() takes action based on the error returned by the controller.
1037: */
1038: void ide_error (ide_drive_t *drive, const char *msg, byte stat)
1039: {
1040: struct request *rq;
1041: byte err;
1042:
1043: err = ide_dump_status(drive, msg, stat);
1044: if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
1045: return;
1046: /* retry only "normal" I/O: */
1047: if (rq->cmd == IDE_DRIVE_CMD) {
1048: rq->errors = 1;
1049: ide_end_drive_cmd(drive, stat, err);
1050: return;
1051: }
1052: if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
1053: rq->errors |= ERROR_RESET;
1054: } else {
1055: if (drive->media == ide_disk && (stat & ERR_STAT)) {
1056: /* err has different meaning on cdrom and tape */
1057: if (err == ABRT_ERR) {
1058: if (drive->select.b.lba && IN_BYTE(IDE_COMMAND_REG) == WIN_SPECIFY)
1059: return; /* some newer drives don't support WIN_SPECIFY */
1060: } else if ((err & (ABRT_ERR | ICRC_ERR)) == (ABRT_ERR | ICRC_ERR))
1061: ; /* UDMA crc error -- just retry the operation */
1062: else if (err & (BBD_ERR | ECC_ERR)) /* retries won't help these */
1063: rq->errors = ERROR_MAX;
1064: else if (err & TRK0_ERR) /* help it find track zero */
1065: rq->errors |= ERROR_RECAL;
1066: else if (err & MC_ERR)
1067: drive->special.b.mc = 1;
1068: }
1069: if ((stat & DRQ_STAT) && rq->cmd != WRITE)
1070: try_to_flush_leftover_data(drive);
1071: }
1072: if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
1073: rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
1074:
1075: if (rq->errors >= ERROR_MAX) {
1076: #ifdef CONFIG_BLK_DEV_IDETAPE
1077: if (drive->media == ide_tape) {
1078: rq->errors = 0;
1079: idetape_end_request(0, HWGROUP(drive));
1080: } else
1081: #endif /* CONFIG_BLK_DEV_IDETAPE */
1082: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
1083: if (drive->media == ide_floppy) {
1084: rq->errors = 0;
1085: idefloppy_end_request(0, HWGROUP(drive));
1086: } else
1087: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
1088: #ifdef CONFIG_BLK_DEV_IDESCSI
1089: if (drive->media == ide_scsi) {
1090: rq->errors = 0;
1091: idescsi_end_request(0, HWGROUP(drive));
1092: } else
1093: #endif /* CONFIG_BLK_DEV_IDESCSI */
1094: ide_end_request(0, HWGROUP(drive));
1095: }
1096: else {
1097: if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
1098: ++rq->errors;
1099: ide_do_reset(drive);
1100: return;
1101: } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
1102: drive->special.b.recalibrate = 1;
1103: ++rq->errors;
1104: }
1105: }
1106:
1107: /*
1108: * read_intr() is the handler for disk read/multread interrupts
1109: */
1110: static void read_intr (ide_drive_t *drive)
1111: {
1112: byte stat;
1113: int i;
1114: unsigned int msect, nsect;
1115: struct request *rq;
1116:
1117: if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
1118: ide_error(drive, "read_intr", stat);
1119: return;
1120: }
1121: msect = drive->mult_count;
1122: read_next:
1123: rq = HWGROUP(drive)->rq;
1124: if (msect) {
1125: if ((nsect = rq->current_nr_sectors) > msect)
1126: nsect = msect;
1127: msect -= nsect;
1128: } else
1129: nsect = 1;
1130: ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
1131: #ifdef DEBUG
1132: printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
1133: drive->name, rq->sector, rq->sector+nsect-1,
1134: (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
1135: #endif
1136: rq->sector += nsect;
1137: rq->buffer += nsect<<9;
1138: rq->errors = 0;
1139: i = (rq->nr_sectors -= nsect);
1140: if ((rq->current_nr_sectors -= nsect) <= 0)
1141: ide_end_request(1, HWGROUP(drive));
1142: if (i > 0) {
1143: if (msect)
1144: goto read_next;
1145: ide_set_handler (drive, &read_intr, WAIT_CMD);
1146: }
1147: }
1148:
1149: /*
1150: * write_intr() is the handler for disk write interrupts
1151: */
1152: static void write_intr (ide_drive_t *drive)
1153: {
1154: byte stat;
1155: int i;
1156: ide_hwgroup_t *hwgroup = HWGROUP(drive);
1157: struct request *rq = hwgroup->rq;
1158:
1159: if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1160: #ifdef DEBUG
1161: printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
1162: drive->name, rq->sector, (unsigned long) rq->buffer,
1163: rq->nr_sectors-1);
1164: #endif
1165: if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
1166: rq->sector++;
1167: rq->buffer += 512;
1168: rq->errors = 0;
1169: i = --rq->nr_sectors;
1170: --rq->current_nr_sectors;
1171: if (rq->current_nr_sectors <= 0)
1172: ide_end_request(1, hwgroup);
1173: if (i > 0) {
1174: ide_output_data (drive, rq->buffer, SECTOR_WORDS);
1175: ide_set_handler (drive, &write_intr, WAIT_CMD);
1176: }
1177: return;
1178: }
1179: }
1180: ide_error(drive, "write_intr", stat);
1181: }
1182:
1183: /*
1184: * ide_multwrite() transfers a block of up to mcount sectors of data
1185: * to a drive as part of a disk multiple-sector write operation.
1186: */
1187: void ide_multwrite (ide_drive_t *drive, unsigned int mcount)
1188: {
1189: struct request *rq = &HWGROUP(drive)->wrq;
1190:
1191: do {
1192: unsigned int nsect = rq->current_nr_sectors;
1193: if (nsect > mcount)
1194: nsect = mcount;
1195: mcount -= nsect;
1196:
1197: ide_output_data(drive, rq->buffer, nsect<<7);
1198: #ifdef DEBUG
1199: printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1200: drive->name, rq->sector, (unsigned long) rq->buffer,
1201: nsect, rq->nr_sectors - nsect);
1202: #endif
1203: if ((rq->nr_sectors -= nsect) <= 0)
1204: break;
1205: if ((rq->current_nr_sectors -= nsect) == 0) {
1206: if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1207: rq->current_nr_sectors = rq->bh->b_size>>9;
1208: rq->buffer = rq->bh->b_data;
1209: } else {
1210: panic("%s: buffer list corrupted\n", drive->name);
1211: break;
1212: }
1213: } else {
1214: rq->buffer += nsect << 9;
1215: }
1216: } while (mcount);
1217: }
1218:
1219: /*
1220: * multwrite_intr() is the handler for disk multwrite interrupts
1221: */
1222: static void multwrite_intr (ide_drive_t *drive)
1223: {
1224: byte stat;
1225: int i;
1226: ide_hwgroup_t *hwgroup = HWGROUP(drive);
1227: struct request *rq = &hwgroup->wrq;
1228:
1229: if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1230: if (stat & DRQ_STAT) {
1231: if (rq->nr_sectors) {
1232: ide_multwrite(drive, drive->mult_count);
1233: ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1234: return;
1235: }
1236: } else {
1237: if (!rq->nr_sectors) { /* all done? */
1238: rq = hwgroup->rq;
1239: for (i = rq->nr_sectors; i > 0;){
1240: i -= rq->current_nr_sectors;
1241: ide_end_request(1, hwgroup);
1242: }
1243: return;
1244: }
1245: }
1246: }
1247: ide_error(drive, "multwrite_intr", stat);
1248: }
1249:
1250: /*
1251: * Issue a simple drive command
1252: * The drive must be selected beforehand.
1253: */
1254: static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
1255: {
1256: ide_set_handler (drive, handler, WAIT_CMD);
1257: OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1258: OUT_BYTE(nsect,IDE_NSECTOR_REG);
1259: OUT_BYTE(cmd,IDE_COMMAND_REG);
1260: }
1261:
1262: /*
1263: * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1264: */
1265: static void set_multmode_intr (ide_drive_t *drive)
1266: {
1267: byte stat = GET_STAT();
1268:
1269: sti();
1270: if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1271: drive->mult_count = drive->mult_req;
1272: } else {
1273: drive->mult_req = drive->mult_count = 0;
1274: drive->special.b.recalibrate = 1;
1275: (void) ide_dump_status(drive, "set_multmode", stat);
1276: }
1277: }
1278:
1279: /*
1280: * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1281: */
1282: static void set_geometry_intr (ide_drive_t *drive)
1283: {
1284: byte stat = GET_STAT();
1285:
1286: sti();
1287: if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1288: ide_error(drive, "set_geometry_intr", stat);
1289: }
1290:
1291: /*
1292: * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1293: */
1294: static void recal_intr (ide_drive_t *drive)
1295: {
1296: byte stat = GET_STAT();
1297:
1298: sti();
1299: if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1300: ide_error(drive, "recal_intr", stat);
1301: }
1302:
1303: /*
1304: * mc_intr() is invoked on completion of a WIN_ACKMC cmd.
1305: */
1306: static void mc_intr (ide_drive_t *drive)
1307: {
1308: byte stat = GET_STAT();
1309:
1310: sti();
1311: if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1312: ide_error(drive, "mc_intr", stat);
1313: drive->special.b.mc = 0;
1314: }
1315:
1316: /*
1317: * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1318: */
1319: static void drive_cmd_intr (ide_drive_t *drive)
1320: {
1321: struct request *rq = HWGROUP(drive)->rq;
1322: byte *args = (byte *) rq->buffer;
1323: byte stat = GET_STAT();
1324:
1325: sti();
1326: if ((stat & DRQ_STAT) && args && args[3]) {
1327: byte io_32bit = drive->io_32bit;
1328: drive->io_32bit = 0;
1329: ide_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
1330: drive->io_32bit = io_32bit;
1331: stat = GET_STAT();
1332: }
1333: if (OK_STAT(stat,READY_STAT,BAD_STAT))
1334: ide_end_drive_cmd (drive, stat, GET_ERR());
1335: else
1336: ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
1337: }
1338:
1339: /*
1340: * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1341: * commands to a drive. It used to do much more, but has been scaled back.
1342: */
1343: static inline void do_special (ide_drive_t *drive)
1344: {
1345: special_t *s = &drive->special;
1346:
1347: #ifdef DEBUG
1348: printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1349: #endif
1350: if (s->b.set_geometry) {
1351: s->b.set_geometry = 0;
1352: if (drive->media == ide_disk && !drive->no_geom) {
1353: OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1354: OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1355: OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1356: OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1357: if (!IS_PROMISE_DRIVE)
1358: ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1359: }
1360: } else if (s->b.recalibrate) {
1361: s->b.recalibrate = 0;
1362: if (drive->media == ide_disk && !IS_PROMISE_DRIVE)
1363: ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1364: } else if (s->b.set_tune) {
1365: ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
1366: s->b.set_tune = 0;
1367: if (tuneproc != NULL)
1368: tuneproc(drive, drive->tune_req);
1369: } else if (s->b.set_multmode) {
1370: s->b.set_multmode = 0;
1371: if (drive->media == ide_disk) {
1372: if (drive->id && drive->mult_req > drive->id->max_multsect)
1373: drive->mult_req = drive->id->max_multsect;
1374: if (!IS_PROMISE_DRIVE)
1375: ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1376: } else
1377: drive->mult_req = 0;
1378: } else if (s->b.mc) {
1379: s->b.mc = 0;
1380: if (drive->media == ide_disk && !IS_PROMISE_DRIVE)
1381: ide_cmd(drive, WIN_ACKMC, drive->sect, &mc_intr);
1382: } else if (s->all) {
1383: int special = s->all;
1384: s->all = 0;
1385: printk("%s: bad special flag: 0x%02x\n", drive->name, special);
1386: }
1387: }
1388:
1389: /*
1390: * This routine busy-waits for the drive status to be not "busy".
1391: * It then checks the status for all of the "good" bits and none
1392: * of the "bad" bits, and if all is okay it returns 0. All other
1393: * cases return 1 after invoking ide_error() -- caller should just return.
1394: *
1395: * This routine should get fixed to not hog the cpu during extra long waits..
1396: * That could be done by busy-waiting for the first jiffy or two, and then
1397: * setting a timer to wake up at half second intervals thereafter,
1398: * until timeout is achieved, before timing out.
1399: */
1400: int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
1401: {
1402: byte stat;
1403: unsigned long flags;
1404:
1405: udelay(1); /* spec allows drive 400ns to assert "BUSY" */
1406: if ((stat = GET_STAT()) & BUSY_STAT) {
1407: save_flags(flags);
1408: sti();
1409: timeout += jiffies;
1410: while ((stat = GET_STAT()) & BUSY_STAT) {
1411: if (jiffies > timeout) {
1412: restore_flags(flags);
1413: ide_error(drive, "status timeout", stat);
1414: return 1;
1415: }
1416: }
1417: restore_flags(flags);
1418: }
1419: udelay(1); /* allow status to settle, then read it again */
1420: if (OK_STAT((stat = GET_STAT()), good, bad))
1421: return 0;
1422: ide_error(drive, "status error", stat);
1423: return 1;
1424: }
1425:
1426: /*
1427: * do_rw_disk() issues READ and WRITE commands to a disk,
1428: * using LBA if supported, or CHS otherwise, to address sectors.
1429: * It also takes care of issuing special DRIVE_CMDs.
1430: */
1431: static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
1432: {
1433: ide_hwif_t *hwif = HWIF(drive);
1434: unsigned short io_base = hwif->io_base;
1435: #ifdef CONFIG_BLK_DEV_PROMISE
1436: int use_promise_io = 0;
1437: #endif /* CONFIG_BLK_DEV_PROMISE */
1438:
1439: OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1440: OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1441: #ifdef CONFIG_BLK_DEV_PROMISE
1442: if (IS_PROMISE_DRIVE) {
1443: if (hwif->is_promise2 || rq->cmd == READ) {
1444: use_promise_io = 1;
1445: }
1446: }
1447: if (drive->select.b.lba || use_promise_io) {
1448: #else /* !CONFIG_BLK_DEV_PROMISE */
1449: if (drive->select.b.lba) {
1450: #endif /* CONFIG_BLK_DEV_PROMISE */
1451: #ifdef DEBUG
1452: printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1453: drive->name, (rq->cmd==READ)?"read":"writ",
1454: block, rq->nr_sectors, (unsigned long) rq->buffer);
1455: #endif
1456: OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1457: OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1458: OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1459: OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1460: } else {
1461: unsigned int sect,head,cyl,track;
1462: track = block / drive->sect;
1463: sect = block % drive->sect + 1;
1464: OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1465: head = track % drive->head;
1466: cyl = track / drive->head;
1467: OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1468: OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1469: OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1470: #ifdef DEBUG
1471: printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1472: drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1473: head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1474: #endif
1475: }
1476: #ifdef CONFIG_BLK_DEV_PROMISE
1477: if (use_promise_io) {
1478: do_promise_io (drive, rq);
1479: return;
1480: }
1481: #endif /* CONFIG_BLK_DEV_PROMISE */
1482: if (rq->cmd == READ) {
1483: #ifdef CONFIG_BLK_DEV_TRITON
1484: if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1485: return;
1486: #endif /* CONFIG_BLK_DEV_TRITON */
1487: ide_set_handler(drive, &read_intr, WAIT_CMD);
1488: OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1489: return;
1490: }
1491: if (rq->cmd == WRITE) {
1492: #ifdef CONFIG_BLK_DEV_TRITON
1493: if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1494: return;
1495: #endif /* CONFIG_BLK_DEV_TRITON */
1496: OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1497: if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1498: printk("%s: no DRQ after issuing %s\n", drive->name,
1499: drive->mult_count ? "MULTWRITE" : "WRITE");
1500: return;
1501: }
1502: if (!drive->unmask)
1503: cli();
1504: if (drive->mult_count) {
1505: HWGROUP(drive)->wrq = *rq; /* scratchpad */
1506: ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1507: ide_multwrite(drive, drive->mult_count);
1508: } else {
1509: ide_set_handler (drive, &write_intr, WAIT_CMD);
1510: ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1511: }
1512: return;
1513: }
1514: printk("%s: bad command: %d\n", drive->name, rq->cmd);
1515: ide_end_request(0, HWGROUP(drive));
1516: }
1517:
1518: /*
1519: * execute_drive_cmd() issues a special drive command,
1520: * usually initiated by ioctl() from the external hdparm program.
1521: */
1522: static void execute_drive_cmd (ide_drive_t *drive, struct request *rq)
1523: {
1524: byte *args = rq->buffer;
1525: if (args) {
1526: #ifdef DEBUG
1527: printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x xx=0x%02x\n",
1528: drive->name, args[0], args[1], args[2], args[3]);
1529: #endif
1530: OUT_BYTE(args[2],IDE_FEATURE_REG);
1531: ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1532: return;
1533: } else {
1534: /*
1535: * NULL is actually a valid way of waiting for
1536: * all current requests to be flushed from the queue.
1537: */
1538: #ifdef DEBUG
1539: printk("%s: DRIVE_CMD (null)\n", drive->name);
1540: #endif
1541: ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
1542: return;
1543: }
1544: }
1545:
1546: /*
1547: * do_request() initiates handling of a new I/O request
1548: */
1549: static inline void do_request (ide_hwif_t *hwif, struct request *rq)
1550: {
1551: unsigned int minor, unit;
1552: unsigned long block, blockend;
1553: ide_drive_t *drive;
1554:
1555: sti();
1556: #ifdef DEBUG
1557: printk("%s: do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1558: #endif
1559: minor = MINOR(rq->rq_dev);
1560: unit = minor >> PARTN_BITS;
1561: if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1562: printk("%s: bad device number: %s\n",
1563: hwif->name, kdevname(rq->rq_dev));
1564: goto kill_rq;
1565: }
1566: drive = &hwif->drives[unit];
1567: #ifdef DEBUG
1568: if (rq->bh && !buffer_locked(rq->bh)) {
1569: printk("%s: block not locked\n", drive->name);
1570: goto kill_rq;
1571: }
1572: #endif
1573: block = rq->sector;
1574: blockend = block + rq->nr_sectors;
1575: if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1576: printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1577: (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1578: goto kill_rq;
1579: }
1580: block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1581: #if FAKE_FDISK_FOR_EZDRIVE
1582: if (block == 0 && drive->remap_0_to_1)
1583: block = 1; /* redirect MBR access to EZ-Drive partn table */
1584: #endif /* FAKE_FDISK_FOR_EZDRIVE */
1585: ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1586: #if (DISK_RECOVERY_TIME > 0)
1587: while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1588: #endif
1589:
1590: #ifdef CONFIG_BLK_DEV_IDETAPE
1591: POLL_HWIF_TAPE_DRIVE; /* macro from ide-tape.h */
1592: #endif /* CONFIG_BLK_DEV_IDETAPE */
1593:
1594: SELECT_DRIVE(hwif,drive);
1595: if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1596: printk("%s: drive not ready for command\n", drive->name);
1597: return;
1598: }
1599:
1600: if (!drive->special.all) {
1601: if (rq->cmd == IDE_DRIVE_CMD) {
1602: execute_drive_cmd(drive, rq);
1603: return;
1604: }
1605: #ifdef CONFIG_BLK_DEV_IDEATAPI
1606: switch (drive->media) {
1607: case ide_disk:
1608: do_rw_disk (drive, rq, block);
1609: return;
1610: #ifdef CONFIG_BLK_DEV_IDECD
1611: case ide_cdrom:
1612: ide_do_rw_cdrom (drive, block);
1613: return;
1614: #endif /* CONFIG_BLK_DEV_IDECD */
1615: #ifdef CONFIG_BLK_DEV_IDETAPE
1616: case ide_tape:
1617: idetape_do_request (drive, rq, block);
1618: return;
1619: #endif /* CONFIG_BLK_DEV_IDETAPE */
1620: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
1621: case ide_floppy:
1622: idefloppy_do_request (drive, rq, block);
1623: return;
1624: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
1625: #ifdef CONFIG_BLK_DEV_IDESCSI
1626: case ide_scsi:
1627: idescsi_do_request (drive, rq, block);
1628: return;
1629: #endif /* CONFIG_BLK_DEV_IDESCSI */
1630:
1631: default:
1632: printk("%s: media type %d not supported\n",
1633: drive->name, drive->media);
1634: goto kill_rq;
1635: }
1636: #else
1637: do_rw_disk (drive, rq, block); /* simpler and faster */
1638: return;
1639: #endif /* CONFIG_BLK_DEV_IDEATAPI */;
1640: }
1641: do_special(drive);
1642: return;
1643: kill_rq:
1644: ide_end_request(0, hwif->hwgroup);
1645: }
1646:
1647: /*
1648: * The driver enables interrupts as much as possible. In order to do this,
1649: * (a) the device-interrupt is always masked before entry, and
1650: * (b) the timeout-interrupt is always disabled before entry.
1651: *
1652: * If we enter here from, say irq14, and then start a new request for irq15,
1653: * (possible with "serialize" option) then we cannot ensure that we exit
1654: * before the irq15 hits us. So, we must be careful not to let this bother us.
1655: *
1656: * Interrupts are still masked (by default) whenever we are exchanging
1657: * data/cmds with a drive, because some drives seem to have very poor
1658: * tolerance for latency during I/O. For devices which don't suffer from
1659: * this problem (most don't), the unmask flag can be set using the "hdparm"
1660: * utility, to permit other interrupts during data/cmd transfers.
1661: */
1662: void ide_do_request (ide_hwgroup_t *hwgroup)
1663: {
1664: cli(); /* paranoia */
1665: if (hwgroup->handler != NULL) {
1666: printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1667: return;
1668: }
1669: do {
1670: ide_hwif_t *hwif = hwgroup->hwif;
1671: struct request *rq;
1672: if ((rq = hwgroup->rq) == NULL) {
1673: if (hwif->sharing_irq && hwgroup->drive) /* set nIEN */
1674: OUT_BYTE(hwgroup->drive->ctl|2,hwif->ctl_port);
1675: /*
1676: * hwgroup->next_hwif is different from hwgroup->hwif
1677: * only when a request is inserted using "ide_next".
1678: * This saves wear and tear on IDE tapes.
1679: */
1680: hwif = hwgroup->next_hwif;
1681: do {
1682: rq = blk_dev[hwif->major].current_request;
1683: if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1684: goto got_rq;
1685: } while ((hwif = hwif->next) != hwgroup->next_hwif);
1686: hwgroup->active = 0;
1687: return; /* no work left for this hwgroup */
1688: }
1689: got_rq:
1690: do_request(hwgroup->hwif = hwgroup->next_hwif = hwif, hwgroup->rq = rq);
1691: cli();
1692: } while (hwgroup->handler == NULL);
1693: }
1694:
1695: /*
1696: * do_hwgroup_request() invokes ide_do_request() after first masking
1697: * all possible interrupts for the current hwgroup. This prevents race
1698: * conditions in the event that an unexpected interrupt occurs while
1699: * we are in the driver.
1700: *
1701: * Note that when an interrupt is used to reenter the driver, the first level
1702: * handler will already have masked the irq that triggered, but any other ones
1703: * for the hwgroup will still be unmasked. The driver tries to be careful
1704: * about such things.
1705: */
1706: static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
1707: {
1708: if (hwgroup->handler == NULL) {
1709: ide_hwif_t *hgif = hwgroup->hwif;
1710: ide_hwif_t *hwif = hgif;
1711: hwgroup->active = 1;
1712: do {
1713: disable_irq(hwif->irq);
1714: } while ((hwif = hwif->next) != hgif);
1715: ide_do_request (hwgroup);
1716: do {
1717: enable_irq(hwif->irq);
1718: } while ((hwif = hwif->next) != hgif);
1719: }
1720: }
1721:
1722: static void do_ide0_request (void) /* invoked with cli() */
1723: {
1724: do_hwgroup_request (ide_hwifs[0].hwgroup);
1725: }
1726:
1727: #if MAX_HWIFS > 1
1728: static void do_ide1_request (void) /* invoked with cli() */
1729: {
1730: do_hwgroup_request (ide_hwifs[1].hwgroup);
1731: }
1732: #endif
1733:
1734: #if MAX_HWIFS > 2
1735: static void do_ide2_request (void) /* invoked with cli() */
1736: {
1737: do_hwgroup_request (ide_hwifs[2].hwgroup);
1738: }
1739: #endif
1740:
1741: #if MAX_HWIFS > 3
1742: static void do_ide3_request (void) /* invoked with cli() */
1743: {
1744: do_hwgroup_request (ide_hwifs[3].hwgroup);
1745: }
1746: #endif
1747:
1748: static void timer_expiry (unsigned long data)
1749: {
1750: ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1751: ide_drive_t *drive = hwgroup->drive;
1752: unsigned long flags;
1753:
1754: save_flags(flags);
1755: cli();
1756:
1757: if (hwgroup->poll_timeout != 0) { /* polling in progress? */
1758: ide_handler_t *handler = hwgroup->handler;
1759: hwgroup->handler = NULL;
1760: handler(drive);
1761: } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1762: sti(); /* drive must have responded just as the timer expired */
1763: printk("%s: marginal timeout\n", drive->name);
1764: } else {
1765: hwgroup->handler = NULL; /* abort the operation */
1766: if (hwgroup->hwif->dmaproc)
1767: (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1768: ide_error(drive, "irq timeout", GET_STAT());
1769: }
1770: if (hwgroup->handler == NULL)
1771: do_hwgroup_request (hwgroup);
1772: restore_flags(flags);
1773: }
1774:
1775: /*
1776: * There's nothing really useful we can do with an unexpected interrupt,
1777: * other than reading the status register (to clear it), and logging it.
1778: * There should be no way that an irq can happen before we're ready for it,
1779: * so we needn't worry much about losing an "important" interrupt here.
1780: *
1781: * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1782: * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1783: * "good", we just ignore the interrupt completely.
1784: *
1785: * This routine assumes cli() is in effect when called.
1786: *
1787: * If an unexpected interrupt happens on irq15 while we are handling irq14
1788: * and if the two interfaces are "serialized" (CMD640), then it looks like
1789: * we could screw up by interfering with a new request being set up for irq15.
1790: *
1791: * In reality, this is a non-issue. The new command is not sent unless the
1792: * drive is ready to accept one, in which case we know the drive is not
1793: * trying to interrupt us. And ide_set_handler() is always invoked before
1794: * completing the issuance of any new drive command, so we will not be
1795: * accidently invoked as a result of any valid command completion interrupt.
1796: *
1797: */
1798: static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
1799: {
1800: byte stat;
1801: unsigned int unit;
1802: ide_hwif_t *hwif = hwgroup->hwif;
1803:
1804: /*
1805: * handle the unexpected interrupt
1806: */
1807: do {
1808: if (hwif->irq == irq) {
1809: for (unit = 0; unit < MAX_DRIVES; ++unit) {
1810: ide_drive_t *drive = &hwif->drives[unit];
1811: if (!drive->present)
1812: continue;
1813: SELECT_DRIVE(hwif,drive);
1814: udelay(100); /* Ugly, but wait_stat() may not be safe here */
1815: if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT)) {
1816: /* Try to not flood the console with msgs */
1817: static unsigned long last_msgtime = 0;
1818: if ((last_msgtime + (HZ/2)) < jiffies) {
1819: last_msgtime = jiffies;
1820: (void) ide_dump_status(drive, "unexpected_intr", stat);
1821: }
1822: }
1823: if ((stat & DRQ_STAT))
1824: try_to_flush_leftover_data(drive);
1825: }
1826: }
1827: } while ((hwif = hwif->next) != hwgroup->hwif);
1828: SELECT_DRIVE(hwif,hwgroup->drive); /* Ugh.. probably interrupts current I/O */
1829: udelay(100); /* Ugly, but wait_stat() may not be safe here */
1830: }
1831:
1832: /*
1833: * entry point for all interrupts, caller does cli() for us
1834: */
1835: void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
1836: {
1837: ide_hwgroup_t *hwgroup = dev_id;
1838: ide_handler_t *handler;
1839:
1840: if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1841: ide_drive_t *drive = hwgroup->drive;
1842: hwgroup->handler = NULL;
1843: del_timer(&(hwgroup->timer));
1844: if (drive->unmask)
1845: sti();
1846: handler(drive);
1847: cli(); /* this is necessary, as next rq may be different irq */
1848: if (hwgroup->handler == NULL) {
1849: SET_RECOVERY_TIMER(HWIF(drive));
1850: ide_do_request(hwgroup);
1851: }
1852: } else {
1853: unexpected_intr(irq, hwgroup);
1854: }
1855: cli();
1856: }
1857:
1858: /*
1859: * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1860: * It returns NULL if the given device number does not match any present drives.
1861: */
1862: static ide_drive_t *get_info_ptr (kdev_t i_rdev)
1863: {
1864: int major = MAJOR(i_rdev);
1865: unsigned int h;
1866:
1867: for (h = 0; h < MAX_HWIFS; ++h) {
1868: ide_hwif_t *hwif = &ide_hwifs[h];
1869: if (hwif->present && major == hwif->major) {
1870: unsigned unit = DEVICE_NR(i_rdev);
1871: if (unit < MAX_DRIVES) {
1872: ide_drive_t *drive = &hwif->drives[unit];
1873: if (drive->present)
1874: return drive;
1875: } else if (major == IDE0_MAJOR && unit < 4) {
1876: printk("ide: probable bad entry for /dev/hd%c\n", 'a'+unit);
1877: printk("ide: to fix it, run: /usr/src/linux/scripts/MAKEDEV.ide\n");
1878: }
1879: break;
1880: }
1881: }
1882: return NULL;
1883: }
1884:
1885: /*
1886: * This function is intended to be used prior to invoking ide_do_drive_cmd().
1887: */
1888: void ide_init_drive_cmd (struct request *rq)
1889: {
1890: rq->buffer = NULL;
1891: rq->cmd = IDE_DRIVE_CMD;
1892: rq->sector = 0;
1893: rq->nr_sectors = 0;
1894: rq->current_nr_sectors = 0;
1895: rq->sem = NULL;
1896: rq->bh = NULL;
1897: rq->bhtail = NULL;
1898: rq->next = NULL;
1899:
1900: #if 0 /* these are done each time through ide_do_drive_cmd() */
1901: rq->errors = 0;
1902: rq->rq_status = RQ_ACTIVE;
1903: rq->rq_dev = ????;
1904: #endif
1905: }
1906:
1907: /*
1908: * This function issues a special IDE device request
1909: * onto the request queue.
1910: *
1911: * If action is ide_wait, then the rq is queued at the end of the
1912: * request queue, and the function sleeps until it has been processed.
1913: * This is for use when invoked from an ioctl handler.
1914: *
1915: * If action is ide_preempt, then the rq is queued at the head of
1916: * the request queue, displacing the currently-being-processed
1917: * request and this function returns immediately without waiting
1918: * for the new rq to be completed. This is VERY DANGEROUS, and is
1919: * intended for careful use by the ATAPI tape/cdrom driver code.
1920: *
1921: * If action is ide_next, then the rq is queued immediately after
1922: * the currently-being-processed-request (if any), and the function
1923: * returns without waiting for the new rq to be completed. As above,
1924: * This is VERY DANGEROUS, and is intended for careful use by the
1925: * ATAPI tape/cdrom driver code.
1926: *
1927: * If action is ide_end, then the rq is queued at the end of the
1928: * request queue, and the function returns immediately without waiting
1929: * for the new rq to be completed. This is again intended for careful
1930: * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
1931: * when operating in the pipelined operation mode).
1932: */
1933: int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
1934: {
1935: unsigned long flags;
1936: unsigned int major = HWIF(drive)->major;
1937: struct request *cur_rq;
1938: struct blk_dev_struct *bdev = &blk_dev[major];
1939: struct semaphore sem = MUTEX_LOCKED;
1940:
1941: if (IS_PROMISE_DRIVE && rq->buffer != NULL)
1942: return -ENOSYS; /* special drive cmds not supported */
1943: rq->errors = 0;
1944: rq->rq_status = RQ_ACTIVE;
1945: rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
1946: if (action == ide_wait)
1947: rq->sem = &sem;
1948: unplug_device(bdev);
1949:
1950: save_flags(flags);
1951: cli();
1952: if (action == ide_next)
1953: HWGROUP(drive)->next_hwif = HWIF(drive);
1954: cur_rq = bdev->current_request;
1955:
1956: if (cur_rq == NULL || action == ide_preempt) {
1957: rq->next = cur_rq;
1958: bdev->current_request = rq;
1959: if (action == ide_preempt)
1960: HWGROUP(drive)->rq = NULL;
1961: } else {
1962: if (action == ide_wait || action == ide_end) {
1963: while (cur_rq->next != NULL) /* find end of list */
1964: cur_rq = cur_rq->next;
1965: }
1966: rq->next = cur_rq->next;
1967: cur_rq->next = rq;
1968: }
1969: if (!HWGROUP(drive)->active) {
1970: do_hwgroup_request(HWGROUP(drive));
1971: cli();
1972: }
1973: if (action == ide_wait && rq->rq_status != RQ_INACTIVE)
1974: down(&sem); /* wait for it to be serviced */
1975: restore_flags(flags);
1976: return rq->errors ? -EIO : 0; /* return -EIO if errors */
1977: }
1978:
1979: static int ide_open(struct inode * inode, struct file * filp)
1980: {
1981: ide_drive_t *drive;
1982: unsigned long flags;
1983:
1984: if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1985: return -ENXIO;
1986: save_flags(flags);
1987: cli();
1988: while (drive->busy)
1989: sleep_on(&drive->wqueue);
1990: drive->usage++;
1991: restore_flags(flags);
1992: #ifdef CONFIG_BLK_DEV_IDECD
1993: if (drive->media == ide_cdrom)
1994: return ide_cdrom_open (inode, filp, drive);
1995: #endif /* CONFIG_BLK_DEV_IDECD */
1996: #ifdef CONFIG_BLK_DEV_IDETAPE
1997: if (drive->media == ide_tape)
1998: return idetape_blkdev_open (inode, filp, drive);
1999: #endif /* CONFIG_BLK_DEV_IDETAPE */
2000: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
2001: if (drive->media == ide_floppy)
2002: return idefloppy_open (inode, filp, drive);
2003: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
2004: #ifdef CONFIG_BLK_DEV_IDESCSI
2005: if (drive->media == ide_scsi)
2006: return idescsi_open (inode, filp, drive);
2007: #endif /* CONFIG_BLK_DEV_IDESCSI */
2008: if (drive->removable && drive->usage == 1) {
2009: byte door_lock[] = {WIN_DOORLOCK,0,0,0};
2010: struct request rq;
2011: check_disk_change(inode->i_rdev);
2012: ide_init_drive_cmd (&rq);
2013: rq.buffer = door_lock;
2014: /*
2015: * Ignore the return code from door_lock,
2016: * since the open() has already succeeded,
2017: * and the door_lock is irrelevant at this point.
2018: */
2019: (void) ide_do_drive_cmd(drive, &rq, ide_wait);
2020: }
2021: return 0;
2022: }
2023:
2024: /*
2025: * Releasing a block device means we sync() it, so that it can safely
2026: * be forgotten about...
2027: */
2028: static void ide_release(struct inode * inode, struct file * file)
2029: {
2030: ide_drive_t *drive;
2031:
2032: if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
2033: fsync_dev(inode->i_rdev);
2034: drive->usage--;
2035: #ifdef CONFIG_BLK_DEV_IDECD
2036: if (drive->media == ide_cdrom) {
2037: ide_cdrom_release (inode, file, drive);
2038: return;
2039: }
2040: #endif /* CONFIG_BLK_DEV_IDECD */
2041: #ifdef CONFIG_BLK_DEV_IDETAPE
2042: if (drive->media == ide_tape) {
2043: idetape_blkdev_release (inode, file, drive);
2044: return;
2045: }
2046: #endif /* CONFIG_BLK_DEV_IDETAPE */
2047: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
2048: if (drive->media == ide_floppy) {
2049: idefloppy_release (inode, file, drive);
2050: return;
2051: }
2052: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
2053: #ifdef CONFIG_BLK_DEV_IDESCSI
2054: if (drive->media == ide_scsi) {
2055: idescsi_ide_release (inode, file, drive);
2056: return;
2057: }
2058: #endif /* CONFIG_BLK_DEV_IDESCSI */
2059: if (drive->removable && !drive->usage) {
2060: byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
2061: struct request rq;
2062: invalidate_buffers(inode->i_rdev);
2063: ide_init_drive_cmd (&rq);
2064: rq.buffer = door_unlock;
2065: (void) ide_do_drive_cmd(drive, &rq, ide_wait);
2066: }
2067: }
2068: }
2069:
2070: /*
2071: * This routine is called to flush all partitions and partition tables
2072: * for a changed disk, and then re-read the new partition table.
2073: * If we are revalidating a disk because of a media change, then we
2074: * enter with usage == 0. If we are using an ioctl, we automatically have
2075: * usage == 1 (we need an open channel to use an ioctl :-), so this
2076: * is our limit.
2077: */
2078: static int revalidate_disk(kdev_t i_rdev)
2079: {
2080: ide_drive_t *drive;
2081: unsigned int p, major, minor;
2082: long flags;
2083:
2084: if ((drive = get_info_ptr(i_rdev)) == NULL)
2085: return -ENODEV;
2086:
2087: major = MAJOR(i_rdev);
2088: minor = drive->select.b.unit << PARTN_BITS;
2089: save_flags(flags);
2090: cli();
2091: if (drive->busy || (drive->usage > 1)) {
2092: restore_flags(flags);
2093: return -EBUSY;
2094: };
2095: drive->busy = 1;
2096: restore_flags(flags);
2097:
2098: for (p = 0; p < (1<<PARTN_BITS); ++p) {
2099: if (drive->part[p].nr_sects > 0) {
2100: kdev_t devp = MKDEV(major, minor+p);
2101: fsync_dev (devp);
2102: invalidate_inodes (devp);
2103: invalidate_buffers (devp);
2104: set_blocksize(devp, 1024);
2105: }
2106: drive->part[p].start_sect = 0;
2107: drive->part[p].nr_sects = 0;
2108: };
2109:
2110: drive->part[0].nr_sects = current_capacity(drive);
2111: if ((drive->media != ide_disk && drive->media != ide_floppy) || !drive->part[0].nr_sects)
2112: drive->part[0].start_sect = -1;
2113: resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
2114:
2115: drive->busy = 0;
2116: wake_up(&drive->wqueue);
2117: return 0;
2118: }
2119:
2120: static int write_fs_long (unsigned long useraddr, long value)
2121: {
2122: int err;
2123:
2124: if (NULL == (long *)useraddr)
2125: return -EINVAL;
2126: if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
2127: return err;
2128: put_user((unsigned)value, (long *) useraddr);
2129: return 0;
2130: }
2131:
2132: static int ide_ioctl (struct inode *inode, struct file *file,
2133: unsigned int cmd, unsigned long arg)
2134: {
2135: int err;
2136: ide_drive_t *drive;
2137: unsigned long flags;
2138: struct request rq;
2139:
2140: if (!inode || !(inode->i_rdev))
2141: return -EINVAL;
2142: if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
2143: return -ENODEV;
2144: ide_init_drive_cmd (&rq);
2145: switch (cmd) {
2146: case HDIO_GETGEO:
2147: {
2148: struct hd_geometry *loc = (struct hd_geometry *) arg;
2149: if (!loc || (drive->media != ide_disk && drive->media != ide_floppy)) return -EINVAL;
2150: err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
2151: if (err) return err;
2152: put_user(drive->bios_head, (byte *) &loc->heads);
2153: put_user(drive->bios_sect, (byte *) &loc->sectors);
2154: put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
2155: put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
2156: (unsigned long *) &loc->start);
2157: return 0;
2158: }
2159: case BLKFLSBUF:
2160: if (!suser()) return -EACCES;
2161: fsync_dev(inode->i_rdev);
2162: invalidate_buffers(inode->i_rdev);
2163: return 0;
2164:
2165: case BLKRASET:
2166: if (!suser()) return -EACCES;
2167: if(arg > 0xff) return -EINVAL;
2168: read_ahead[MAJOR(inode->i_rdev)] = arg;
2169: return 0;
2170:
2171: case BLKRAGET:
2172: return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
2173:
2174: case BLKGETSIZE: /* Return device size */
2175: return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
2176: case BLKRRPART: /* Re-read partition tables */
2177: if (!suser()) return -EACCES;
2178: return revalidate_disk(inode->i_rdev);
2179:
2180: case HDIO_GET_KEEPSETTINGS:
2181: return write_fs_long(arg, drive->keep_settings);
2182:
2183: case HDIO_GET_UNMASKINTR:
2184: return write_fs_long(arg, drive->unmask);
2185:
2186: case HDIO_GET_DMA:
2187: return write_fs_long(arg, drive->using_dma);
2188:
2189: case HDIO_GET_32BIT:
2190: return write_fs_long(arg, drive->io_32bit);
2191:
2192: case HDIO_GET_MULTCOUNT:
2193: return write_fs_long(arg, drive->mult_count);
2194:
2195: case HDIO_GET_IDENTITY:
2196: if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
2197: return -EINVAL;
2198: if (drive->id == NULL)
2199: return -ENOMSG;
2200: err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
2201: if (!err)
2202: memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
2203: return err;
2204:
2205: case HDIO_GET_NOWERR:
2206: return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
2207:
2208: case HDIO_SET_DMA:
2209: if (!suser()) return -EACCES;
2210: #ifdef CONFIG_BLK_DEV_IDECD
2211: if (drive->media == ide_cdrom)
2212: return -EPERM;
2213: #endif /* CONFIG_BLK_DEV_IDECD */
2214: if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
2215: return -EPERM;
2216: case HDIO_SET_KEEPSETTINGS:
2217: case HDIO_SET_UNMASKINTR:
2218: case HDIO_SET_NOWERR:
2219: if (arg > 1)
2220: return -EINVAL;
2221: case HDIO_SET_32BIT:
2222: if (!suser()) return -EACCES;
2223: if ((MINOR(inode->i_rdev) & PARTN_MASK))
2224: return -EINVAL;
2225: save_flags(flags);
2226: cli();
2227: switch (cmd) {
2228: case HDIO_SET_DMA:
2229: if (!(HWIF(drive)->dmaproc)) {
2230: restore_flags(flags);
2231: return -EPERM;
2232: }
2233: drive->using_dma = arg;
2234: break;
2235: case HDIO_SET_KEEPSETTINGS:
2236: drive->keep_settings = arg;
2237: break;
2238: case HDIO_SET_UNMASKINTR:
2239: if (arg && drive->no_unmask) {
2240: restore_flags(flags);
2241: return -EPERM;
2242: }
2243: drive->unmask = arg;
2244: break;
2245: case HDIO_SET_NOWERR:
2246: drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
2247: break;
2248: case HDIO_SET_32BIT:
2249: if (arg > (1 + (SUPPORT_VLB_SYNC<<1))) {
2250: restore_flags(flags);
2251: return -EINVAL;
2252: }
2253: if (arg && drive->no_io_32bit) {
2254: restore_flags(flags);
2255: return -EPERM;
2256: }
2257: drive->io_32bit = arg;
2258: #ifdef CONFIG_BLK_DEV_DTC2278
2259: if (HWIF(drive)->chipset == ide_dtc2278)
2260: HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
2261: #endif /* CONFIG_BLK_DEV_DTC2278 */
2262: break;
2263: }
2264: restore_flags(flags);
2265: return 0;
2266:
2267: case HDIO_SET_MULTCOUNT:
2268: if (!suser()) return -EACCES;
2269: if (MINOR(inode->i_rdev) & PARTN_MASK)
2270: return -EINVAL;
2271: if (drive->id && arg > drive->id->max_multsect)
2272: return -EINVAL;
2273: save_flags(flags);
2274: cli();
2275: if (drive->special.b.set_multmode) {
2276: restore_flags(flags);
2277: return -EBUSY;
2278: }
2279: drive->mult_req = arg;
2280: drive->special.b.set_multmode = 1;
2281: restore_flags(flags);
2282: (void) ide_do_drive_cmd (drive, &rq, ide_wait);
2283: return (drive->mult_count == arg) ? 0 : -EIO;
2284:
2285: case HDIO_DRIVE_CMD:
2286: {
2287: byte args[4], *argbuf = args;
2288: int argsize = 4;
2289: if (!suser() || securelevel > 0) return -EACCES;
2290: if (NULL == (void *) arg) {
2291: err = ide_do_drive_cmd(drive, &rq, ide_wait);
2292: } else if (!(err = verify_area(VERIFY_READ,(void *)arg, 4))) {
2293: memcpy_fromfs(args, (void *)arg, 4);
2294: if (args[3]) {
2295: argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
2296: argbuf = kmalloc(argsize, GFP_KERNEL);
2297: if (argbuf == NULL)
2298: return -ENOMEM;
2299: argbuf[0] = args[0];
2300: argbuf[1] = args[1];
2301: argbuf[2] = args[2];
2302: argbuf[3] = args[3];
2303: }
2304: if (!(err = verify_area(VERIFY_WRITE,(void *)arg, argsize))) {
2305: rq.buffer = argbuf;
2306: err = ide_do_drive_cmd(drive, &rq, ide_wait);
2307: memcpy_tofs((void *)arg, argbuf, argsize);
2308: }
2309: if (argsize > 4)
2310: kfree(argbuf);
2311: }
2312: return err;
2313: }
2314: case HDIO_SET_PIO_MODE:
2315: if (!suser()) return -EACCES;
2316: if (MINOR(inode->i_rdev) & PARTN_MASK)
2317: return -EINVAL;
2318: if (!HWIF(drive)->tuneproc)
2319: return -ENOSYS;
2320: save_flags(flags);
2321: cli();
2322: if (drive->special.b.set_tune) {
2323: restore_flags(flags);
2324: return -EBUSY;
2325: }
2326: drive->tune_req = (byte) arg;
2327: drive->special.b.set_tune = 1;
2328: restore_flags(flags);
2329: (void) ide_do_drive_cmd (drive, &rq, ide_wait);
2330: return 0;
2331:
2332: RO_IOCTLS(inode->i_rdev, arg);
2333:
2334: default:
2335: #ifdef CONFIG_BLK_DEV_IDECD
2336: if (drive->media == ide_cdrom)
2337: return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
2338: #endif /* CONFIG_BLK_DEV_IDECD */
2339: #ifdef CONFIG_BLK_DEV_IDETAPE
2340: if (drive->media == ide_tape)
2341: return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
2342: #endif /* CONFIG_BLK_DEV_IDETAPE */
2343: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
2344: if (drive->media == ide_floppy)
2345: return idefloppy_ioctl(drive, inode, file, cmd, arg);
2346: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
2347: #ifdef CONFIG_BLK_DEV_IDESCSI
2348: if (drive->media == ide_scsi)
2349: return idescsi_ioctl(drive, inode, file, cmd, arg);
2350: #endif /* CONFIG_BLK_DEV_IDESCSI */
2351: return -EPERM;
2352: }
2353: }
2354:
2355: static int ide_check_media_change (kdev_t i_rdev)
2356: {
2357: ide_drive_t *drive;
2358:
2359: if ((drive = get_info_ptr(i_rdev)) == NULL)
2360: return -ENODEV;
2361: #ifdef CONFIG_BLK_DEV_IDECD
2362: if (drive->media == ide_cdrom)
2363: return ide_cdrom_check_media_change (drive);
2364: #endif /* CONFIG_BLK_DEV_IDECD */
2365: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
2366: if (drive->media == ide_floppy)
2367: return idefloppy_media_change (drive);
2368: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
2369: if (drive->removable) /* for disks */
2370: return 1; /* always assume it was changed */
2371: return 0;
2372: }
2373:
2374: void ide_fixstring (byte *s, const int bytecount, const int byteswap)
2375: {
2376: byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
2377:
2378: if (byteswap) {
2379: /* convert from big-endian to host byte order */
2380: for (p = end ; p != s;) {
2381: unsigned short *pp = (unsigned short *) (p -= 2);
2382: *pp = ntohs(*pp);
2383: }
2384: }
2385:
2386: /* strip leading blanks */
2387: while (s != end && *s == ' ')
2388: ++s;
2389:
2390: /* compress internal blanks and strip trailing blanks */
2391: while (s != end && *s) {
2392: if (*s++ != ' ' || (s != end && *s && *s != ' '))
2393: *p++ = *(s-1);
2394: }
2395:
2396: /* wipe out trailing garbage */
2397: while (p != end)
2398: *p++ = '\0';
2399: }
2400:
2401: static inline void do_identify (ide_drive_t *drive, byte cmd)
2402: {
2403: int bswap;
2404: struct hd_driveid *id;
2405: unsigned long capacity, check;
2406:
2407: id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
2408: ide_input_data(drive, id, SECTOR_WORDS);/* read 512 bytes of id info */
2409: sti();
2410:
2411: #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
2412: /*
2413: * EATA SCSI controllers do a hardware ATA emulation:
2414: * Ignore them if there is a driver for them available.
2415: */
2416: if ((id->model[0] == 'P' && id->model[1] == 'M')
2417: || (id->model[0] == 'S' && id->model[1] == 'K')) {
2418: printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
2419: drive->present = 0;
2420: return;
2421: }
2422: #endif
2423:
2424: /*
2425: * WIN_IDENTIFY returns little-endian info,
2426: * WIN_PIDENTIFY *usually* returns little-endian info.
2427: */
2428: bswap = 1;
2429: if (cmd == WIN_PIDENTIFY) {
2430: if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2431: || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2432: || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2433: bswap = 0; /* Vertos drives may still be weird */
2434: }
2435: ide_fixstring (id->model, sizeof(id->model), bswap);
2436: ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2437: ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2438:
2439: if (strstr(id->model, "E X A B Y T E N E S T"))
2440: return;
2441:
2442: #ifdef CONFIG_BLK_DEV_IDEATAPI
2443: /*
2444: * Check for an ATAPI device
2445: */
2446: if (cmd == WIN_PIDENTIFY) {
2447: byte type = (id->config >> 8) & 0x1f;
2448: printk("%s: %s, ATAPI ", drive->name, id->model);
2449: #ifdef CONFIG_BLK_DEV_PROMISE
2450: if (HWIF(drive)->is_promise2) {
2451: printk(" -- not supported on 2nd Promise port\n");
2452: drive->present = 0;
2453: return;
2454: }
2455: #endif /* CONFIG_BLK_DEV_PROMISE */
2456: if (!drive->ide_scsi) switch (type) {
2457: case 0:
2458: if (!strstr(id->model, "oppy") && !strstr(id->model, "poyp") && !strstr(id->model, "ZIP"))
2459: printk("cdrom or floppy?, assuming ");
2460: if (drive->media != ide_cdrom && !strstr(id->model, "CD-ROM")) {
2461: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
2462: printk("FLOPPY drive\n");
2463: drive->media = ide_floppy;
2464: if (idefloppy_identify_device(drive, id))
2465: drive->present = 1;
2466: return;
2467: #else
2468: printk("FLOPPY ");
2469: break;
2470: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
2471: }
2472: /* Early cdrom models used zero */
2473: case 5:
2474: #ifdef CONFIG_BLK_DEV_IDECD
2475: printk ("CDROM drive\n");
2476: drive->media = ide_cdrom;
2477: drive->present = 1;
2478: drive->removable = 1;
2479: return;
2480: #else
2481: printk ("CDROM ");
2482: break;
2483: #endif /* CONFIG_BLK_DEV_IDECD */
2484: case 1:
2485: #ifdef CONFIG_BLK_DEV_IDETAPE
2486: printk ("TAPE drive");
2487: if (idetape_identify_device (drive,id)) {
2488: drive->media = ide_tape;
2489: drive->present = 1;
2490: drive->removable = 1;
2491: if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
2492: if (!HWIF(drive)->dmaproc(ide_dma_check, drive))
2493: printk(", DMA");
2494: }
2495: printk("\n");
2496: }
2497: else {
2498: drive->present = 0;
2499: printk ("\nide-tape: the tape is not supported by this version of the driver\n");
2500: }
2501: return;
2502: #else
2503: printk ("TAPE ");
2504: break;
2505: #endif /* CONFIG_BLK_DEV_IDETAPE */
2506: default:
2507: drive->present = 0;
2508: printk("Type %d - Unknown device\n", type);
2509: return;
2510: }
2511: #ifdef CONFIG_BLK_DEV_IDESCSI
2512: printk("drive - enabling SCSI emulation\n");
2513: drive->media = ide_scsi;
2514: drive->present = 1;
2515: idescsi_setup(drive);
2516: #else
2517: drive->present = 0;
2518: printk("- not supported by this kernel\n");
2519: #endif /* CONFIG_BLK_DEV_IDESCSI */
2520: return;
2521: }
2522: #endif /* CONFIG_BLK_DEV_IDEATAPI */
2523:
2524: /* check for removable disks (eg. SYQUEST), ignore 'WD' drives */
2525: if (id->config & (1<<7)) { /* removable disk ? */
2526: if (id->model[0] != 'W' || id->model[1] != 'D')
2527: drive->removable = 1;
2528: }
2529:
2530: /* SunDisk drives: treat as non-removable, force one unit */
2531: if (id->model[0] == 'S' && id->model[1] == 'u') {
2532: drive->removable = 0;
2533: if (drive->select.all & (1<<4)) {
2534: drive->present = 0;
2535: return;
2536: }
2537: }
2538:
2539: drive->media = ide_disk;
2540: /* Extract geometry if we did not already have one for the drive */
2541: if (!drive->present) {
2542: drive->present = 1;
2543: drive->cyl = drive->bios_cyl = id->cyls;
2544: drive->head = drive->bios_head = id->heads;
2545: drive->sect = drive->bios_sect = id->sectors;
2546: }
2547: /* Handle logical geometry translation by the drive */
2548: if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2549: && (id->cur_heads <= 16) && id->cur_sectors)
2550: {
2551: /*
2552: * Extract the physical drive geometry for our use.
2553: * Note that we purposely do *not* update the bios info.
2554: * This way, programs that use it (like fdisk) will
2555: * still have the same logical view as the BIOS does,
2556: * which keeps the partition table from being screwed.
2557: *
2558: * An exception to this is the cylinder count,
2559: * which we reexamine later on to correct for 1024 limitations.
2560: */
2561: drive->cyl = id->cur_cyls;
2562: drive->head = id->cur_heads;
2563: drive->sect = id->cur_sectors;
2564:
2565: /* check for word-swapped "capacity" field in id information */
2566: capacity = drive->cyl * drive->head * drive->sect;
2567: check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2568: if (check == capacity) { /* was it swapped? */
2569: /* yes, bring it into little-endian order: */
2570: id->cur_capacity0 = (capacity >> 0) & 0xffff;
2571: id->cur_capacity1 = (capacity >> 16) & 0xffff;
2572: }
2573: }
2574: /* Use physical geometry if what we have still makes no sense */
2575: if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2576: drive->cyl = id->cyls;
2577: drive->head = id->heads;
2578: drive->sect = id->sectors;
2579: }
2580:
2581: /* calculate drive capacity, and select LBA if possible */
2582: (void) current_capacity (drive);
2583:
2584: /* Correct the number of cyls if the bios value is too small */
2585: if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
2586: if (drive->cyl > drive->bios_cyl)
2587: drive->bios_cyl = drive->cyl;
2588: }
2589:
2590: if (!strncmp(id->model, "BMI ", 4) &&
2591: strstr(id->model, " ENHANCED IDE ") &&
2592: drive->select.b.lba)
2593: drive->no_geom = 1;
2594:
2595: printk ("%s: %.40s, %ldMB w/%dkB Cache, CHS=%d/%d/%d",
2596: drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2597: drive->bios_cyl, drive->bios_head, drive->bios_sect);
2598:
2599: drive->mult_count = 0;
2600: if (id->max_multsect) {
2601: drive->mult_req = INITIAL_MULT_COUNT;
2602: if (drive->mult_req > id->max_multsect)
2603: drive->mult_req = id->max_multsect;
2604: if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2605: drive->special.b.set_multmode = 1;
2606: }
2607: if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
2608: if (!(HWIF(drive)->dmaproc(ide_dma_check, drive))) {
2609: if ((id->field_valid & 4) && (id->dma_ultra & (id->dma_ultra >> 8) & 7))
2610: printk(", UDMA");
2611: else
2612: printk(", DMA");
2613: }
2614: }
2615: printk("\n");
2616: }
2617:
2618: /*
2619: * Delay for *at least* 50ms. As we don't know how much time is left
2620: * until the next tick occurs, we wait an extra tick to be safe.
2621: * This is used only during the probing/polling for drives at boot time.
2622: */
2623: static void delay_50ms (void)
2624: {
2625: unsigned long timer = jiffies + ((HZ + 19)/20) + 1;
2626: while (timer > jiffies);
2627: }
2628:
2629: /*
2630: * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2631: * and waits for a response. It also monitors irqs while this is
2632: * happening, in hope of automatically determining which one is
2633: * being used by the interface.
2634: *
2635: * Returns: 0 device was identified
2636: * 1 device timed-out (no response to identify request)
2637: * 2 device aborted the command (refused to identify itself)
2638: */
2639: static int try_to_identify (ide_drive_t *drive, byte cmd)
2640: {
2641: int hd_status, rc;
2642: unsigned long timeout;
2643: unsigned long irqs_on = 0;
2644: int irq_off;
2645:
2646: if (!HWIF(drive)->irq) { /* already got an IRQ? */
2647: probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2648: irqs_on = probe_irq_on(); /* start monitoring irqs */
2649: OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2650: }
2651:
2652: delay_50ms(); /* take a deep breath */
2653: if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2654: printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2655: hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2656: } else
2657: hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2658:
2659: #if CONFIG_BLK_DEV_PROMISE
2660: if (IS_PROMISE_DRIVE) {
2661: if (promise_cmd(drive,PROMISE_IDENTIFY)) {
2662: if (irqs_on)
2663: (void) probe_irq_off(irqs_on);
2664: return 1;
2665: }
2666: } else
2667: #endif /* CONFIG_BLK_DEV_PROMISE */
2668: OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2669: timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2670: timeout += jiffies;
2671: do {
2672: if (jiffies > timeout) {
2673: if (irqs_on)
2674: (void) probe_irq_off(irqs_on);
2675: return 1; /* drive timed-out */
2676: }
2677: delay_50ms(); /* give drive a breather */
2678: } while (IN_BYTE(hd_status) & BUSY_STAT);
2679:
2680: delay_50ms(); /* wait for IRQ and DRQ_STAT */
2681: if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2682: unsigned long flags;
2683: save_flags(flags);
2684: cli(); /* some systems need this */
2685: do_identify(drive, cmd); /* drive returned ID */
2686: rc = 0; /* drive responded with ID */
2687: (void) GET_STAT(); /* clear drive IRQ */
2688: restore_flags(flags);
2689: } else
2690: rc = 2; /* drive refused ID */
2691: if (!HWIF(drive)->irq) {
2692: irq_off = probe_irq_off(irqs_on); /* get our irq number */
2693: if (irq_off > 0) {
2694: HWIF(drive)->irq = irq_off; /* save it for later */
2695: irqs_on = probe_irq_on();
2696: OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* mask device irq */
2697: udelay(5);
2698: (void) probe_irq_off(irqs_on);
2699: (void) probe_irq_off(probe_irq_on()); /* clear self-inflicted irq */
2700: (void) GET_STAT(); /* clear drive IRQ */
2701:
2702: } else { /* Mmmm.. multiple IRQs.. don't know which was ours */
2703: printk("%s: IRQ probe failed (%d)\n", drive->name, irq_off);
2704: #ifdef CONFIG_BLK_DEV_CMD640
2705: #ifdef CMD640_DUMP_REGS
2706: if (HWIF(drive)->chipset == ide_cmd640) {
2707: printk("%s: Hmmm.. probably a driver problem.\n", drive->name);
2708: CMD640_DUMP_REGS;
2709: }
2710: #endif /* CMD640_DUMP_REGS */
2711: #endif /* CONFIG_BLK_DEV_CMD640 */
2712: }
2713: }
2714: return rc;
2715: }
2716:
2717: /*
2718: * do_probe() has the difficult job of finding a drive if it exists,
2719: * without getting hung up if it doesn't exist, without trampling on
2720: * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2721: *
2722: * If a drive is "known" to exist (from CMOS or kernel parameters),
2723: * but does not respond right away, the probe will "hang in there"
2724: * for the maximum wait time (about 30 seconds), otherwise it will
2725: * exit much more quickly.
2726: *
2727: * Returns: 0 device was identified
2728: * 1 device timed-out (no response to identify request)
2729: * 2 device aborted the command (refused to identify itself)
2730: * 3 bad status from device (possible for ATAPI drives)
2731: * 4 probe was not attempted because failure was obvious
2732: */
2733: static int do_probe (ide_drive_t *drive, byte cmd)
2734: {
2735: int rc;
2736: ide_hwif_t *hwif = HWIF(drive);
2737: unsigned long timeout;
2738: #ifdef CONFIG_BLK_DEV_IDEATAPI
2739: if (drive->present) { /* avoid waiting for inappropriate probes */
2740: if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
2741: return 4;
2742: }
2743: #endif /* CONFIG_BLK_DEV_IDEATAPI */
2744: #ifdef DEBUG
2745: printk("probing for %s: present=%d, media=%d, probetype=%s\n",
2746: drive->name, drive->present, drive->media,
2747: (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2748: #endif
2749: SELECT_DRIVE(hwif,drive);
2750: delay_50ms();
2751: if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2752: OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2753: delay_50ms(); /* allow BUSY_STAT to assert & clear */
2754: return 3; /* no i/f present: avoid killing ethernet cards */
2755: }
2756:
2757: if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2758: || drive->present || cmd == WIN_PIDENTIFY)
2759: {
2760: if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2761: rc = try_to_identify(drive,cmd); /* failed: try again */
2762: if (rc == 1 && cmd == WIN_PIDENTIFY && drive->autotune != 2) {
2763: printk("%s: no response (status = 0x%02x), resetting drive\n", drive->name, GET_STAT());
2764: delay_50ms();
2765: OUT_BYTE (drive->select.all, IDE_SELECT_REG);
2766: delay_50ms();
2767: OUT_BYTE(WIN_SRST, IDE_COMMAND_REG);
2768: timeout = jiffies;
2769: while ((GET_STAT() & BUSY_STAT) && jiffies < timeout + WAIT_WORSTCASE)
2770: delay_50ms();
2771: rc = try_to_identify(drive, cmd);
2772: }
2773: if (rc == 1)
2774: printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2775: (void) GET_STAT(); /* ensure drive irq is clear */
2776: } else {
2777: rc = 3; /* not present or maybe ATAPI */
2778: }
2779: if (drive->select.b.unit != 0) {
2780: OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2781: delay_50ms();
2782: (void) GET_STAT(); /* ensure drive irq is clear */
2783: }
2784: return rc;
2785: }
2786:
2787: static void enable_nest (ide_drive_t *drive)
2788: {
2789: unsigned long timeout;
2790:
2791: printk("%s: enabling %s -- ", HWIF(drive)->name, drive->id->model);
2792: SELECT_DRIVE(HWIF(drive), drive);
2793: delay_50ms();
2794: OUT_BYTE(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
2795: timeout = jiffies + WAIT_WORSTCASE;
2796: do {
2797: if (jiffies > timeout) {
2798: printk("failed (timeout)\n");
2799: return;
2800: }
2801: delay_50ms();
2802: } while (GET_STAT() & BUSY_STAT);
2803: delay_50ms();
2804: if (!OK_STAT(GET_STAT(), 0, BAD_STAT))
2805: printk("failed (status = 0x%02x)\n", GET_STAT());
2806: else
2807: printk("success\n");
2808: if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2809: #ifdef CONFIG_BLK_DEV_IDEATAPI
2810: (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2811: #endif /* CONFIG_BLK_DEV_IDEATAPI */
2812: }
2813: }
2814:
2815: /*
2816: * probe_for_drive() tests for existence of a given drive using do_probe().
2817: *
2818: * Returns: 0 no device was found
2819: * 1 device was found (note: drive->present might still be 0)
2820: */
2821: static inline byte probe_for_drive (ide_drive_t *drive)
2822: {
2823: if (drive->noprobe) /* skip probing? */
2824: return drive->present;
2825: if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2826: #ifdef CONFIG_BLK_DEV_IDEATAPI
2827: (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2828: #endif /* CONFIG_BLK_DEV_IDEATAPI */
2829: }
2830: if (drive->id && strstr(drive->id->model, "E X A B Y T E N E S T"))
2831: enable_nest(drive);
2832: if (!drive->present)
2833: return 0; /* drive not found */
2834: if (drive->id == NULL) { /* identification failed? */
2835: if (drive->media == ide_disk) {
2836: printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2837: drive->name, drive->cyl, drive->head, drive->sect);
2838: }
2839: #ifdef CONFIG_BLK_DEV_IDECD
2840: else if (drive->media == ide_cdrom) {
2841: printk("%s: ATAPI cdrom (?)\n", drive->name);
2842: }
2843: #endif /* CONFIG_BLK_DEV_IDECD */
2844: else {
2845: drive->present = 0; /* nuke it */
2846: }
2847: }
2848: return 1; /* drive was found */
2849: }
2850:
2851: /*
2852: * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2853: * controller that is BIOS compatible with ST-506, and thus showing up in our
2854: * BIOS table, but not register compatible, and therefore not present in CMOS.
2855: *
2856: * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2857: * drives in the system -- the ones reflected as drive 1 or 2. The first
2858: * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2859: * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2860: * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2861: * means we have an AT controller hard disk for that drive.
2862: *
2863: * Of course, there is no guarantee that either drive is actually on the
2864: * "primary" IDE interface, but we don't bother trying to sort that out here.
2865: * If a drive is not actually on the primary interface, then these parameters
2866: * will be ignored. This results in the user having to supply the logical
2867: * drive geometry as a boot parameter for each drive not on the primary i/f.
2868: *
2869: * The only "perfect" way to handle this would be to modify the setup.[cS] code
2870: * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2871: * for us during initialization. I have the necessary docs -- any takers? -ml
2872: */
2873: static void probe_cmos_for_drives (ide_hwif_t *hwif)
2874: {
2875: #ifdef __i386__
2876: extern struct drive_info_struct drive_info;
2877: byte cmos_disks, *BIOS = (byte *) &drive_info;
2878: int unit;
2879:
2880: #ifdef CONFIG_BLK_DEV_PROMISE
2881: if (hwif->is_promise2)
2882: return;
2883: #endif /* CONFIG_BLK_DEV_PROMISE */
2884: outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2885: cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2886: /* Extract drive geometry from CMOS+BIOS if not already setup */
2887: for (unit = 0; unit < MAX_DRIVES; ++unit) {
2888: ide_drive_t *drive = &hwif->drives[unit];
2889: if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present && !drive->nobios) {
2890: drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2891: drive->head = drive->bios_head = *(BIOS+2);
2892: drive->sect = drive->bios_sect = *(BIOS+14);
2893: drive->ctl = *(BIOS+8);
2894: drive->present = 1;
2895: }
2896: BIOS += 16;
2897: }
2898: #endif
2899: }
2900:
2901: /*
2902: * This routine only knows how to look for drive units 0 and 1
2903: * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2904: */
2905: static void probe_hwif (ide_hwif_t *hwif)
2906: {
2907: unsigned int unit;
2908:
2909: if (hwif->noprobe)
2910: return;
2911: if (hwif->io_base == HD_DATA)
2912: probe_cmos_for_drives (hwif);
2913: #if CONFIG_BLK_DEV_PROMISE
2914: if (!hwif->is_promise2 &&
2915: (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1))) {
2916: #else
2917: if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2918: #endif /* CONFIG_BLK_DEV_PROMISE */
2919: int msgout = 0;
2920: for (unit = 0; unit < MAX_DRIVES; ++unit) {
2921: ide_drive_t *drive = &hwif->drives[unit];
2922: if (drive->present) {
2923: drive->present = 0;
2924: printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2925: msgout = 1;
2926: }
2927: }
2928: if (!msgout)
2929: printk("%s: ports already in use, skipping probe\n", hwif->name);
2930: } else {
2931: unsigned long flags;
2932: save_flags(flags);
2933:
2934: sti(); /* needed for jiffies and irq probing */
2935: /*
2936: * Second drive should only exist if first drive was found,
2937: * but a lot of cdrom drives are configured as single slaves.
2938: */
2939: for (unit = 0; unit < MAX_DRIVES; ++unit) {
2940: ide_drive_t *drive = &hwif->drives[unit];
2941: (void) probe_for_drive (drive);
2942: if (drive->present && drive->media == ide_disk) {
2943: if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
2944: printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2945: drive->name, drive->head);
2946: drive->present = 0;
2947: }
2948: }
2949: if (drive->present && !hwif->present) {
2950: hwif->present = 1;
2951: request_region(hwif->io_base, 8, hwif->name);
2952: request_region(hwif->ctl_port, 1, hwif->name);
2953: }
2954: }
2955: restore_flags(flags);
2956: for (unit = 0; unit < MAX_DRIVES; ++unit) {
2957: ide_drive_t *drive = &hwif->drives[unit];
2958: if (drive->present && drive->media != ide_tape) {
2959: ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
2960: if (tuneproc != NULL && drive->autotune == 1)
2961: tuneproc(drive, 255); /* auto-tune PIO mode */
2962: }
2963: }
2964: }
2965: }
2966:
2967: /*
2968: * stridx() returns the offset of c within s,
2969: * or -1 if c is '\0' or not found within s.
2970: */
2971: static int stridx (const char *s, char c)
2972: {
2973: char *i = strchr(s, c);
2974: return (i && c) ? i - s : -1;
2975: }
2976:
2977: /*
2978: * match_parm() does parsing for ide_setup():
2979: *
2980: * 1. the first char of s must be '='.
2981: * 2. if the remainder matches one of the supplied keywords,
2982: * the index (1 based) of the keyword is negated and returned.
2983: * 3. if the remainder is a series of no more than max_vals numbers
2984: * separated by commas, the numbers are saved in vals[] and a
2985: * count of how many were saved is returned. Base10 is assumed,
2986: * and base16 is allowed when prefixed with "0x".
2987: * 4. otherwise, zero is returned.
2988: */
2989: static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
2990: {
2991: static const char *decimal = "0123456789";
2992: static const char *hex = "0123456789abcdef";
2993: int i, n;
2994:
2995: if (*s++ == '=') {
2996: /*
2997: * Try matching against the supplied keywords,
2998: * and return -(index+1) if we match one
2999: */
3000: if (keywords != NULL) {
3001: for (i = 0; *keywords != NULL; ++i) {
3002: if (!strcmp(s, *keywords++))
3003: return -(i+1);
3004: }
3005: }
3006: /*
3007: * Look for a series of no more than "max_vals"
3008: * numeric values separated by commas, in base10,
3009: * or base16 when prefixed with "0x".
3010: * Return a count of how many were found.
3011: */
3012: for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
3013: vals[n] = i;
3014: while ((i = stridx(decimal, *++s)) >= 0)
3015: vals[n] = (vals[n] * 10) + i;
3016: if (*s == 'x' && !vals[n]) {
3017: while ((i = stridx(hex, *++s)) >= 0)
3018: vals[n] = (vals[n] * 0x10) + i;
3019: }
3020: if (++n == max_vals)
3021: break;
3022: if (*s == ',')
3023: ++s;
3024: }
3025: if (!*s)
3026: return n;
3027: }
3028: return 0; /* zero = nothing matched */
3029: }
3030:
3031: /*
3032: * ide_setup() gets called VERY EARLY during initialization,
3033: * to handle kernel "command line" strings beginning with "hdx="
3034: * or "ide". Here is the complete set currently supported:
3035: *
3036: * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
3037: * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
3038: *
3039: * "hdx=noprobe" : drive may be present, but do not probe for it
3040: * "hdx=none" : drive is NOT present, ignore cmos and do not probe
3041: * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
3042: * "hdx=cdrom" : drive is present, and is a cdrom drive
3043: * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
3044: * "hdx=autotune" : driver will attempt to tune interface speed
3045: * to the fastest PIO mode supported,
3046: * if possible for this drive only.
3047: * Not fully supported by all chipset types,
3048: * and quite likely to cause trouble with
3049: * older/odd IDE drives.
3050: *
3051: * "idebus=xx" : inform IDE driver of VESA/PCI bus speed in Mhz,
3052: * where "xx" is between 20 and 66 inclusive,
3053: * used when tuning chipset PIO modes.
3054: * For PCI bus, 25 is correct for a P75 system,
3055: * 30 is correct for P90,P120,P180 systems,
3056: * and 33 is used for P100,P133,P166 systems.
3057: * If in doubt, use idebus=33 for PCI.
3058: * As for VLB, it is safest to not specify it.
3059: *
3060: * "idex=noprobe" : do not attempt to access/use this interface
3061: * "idex=base" : probe for an interface at the addr specified,
3062: * where "base" is usually 0x1f0 or 0x170
3063: * and "ctl" is assumed to be "base"+0x206
3064: * "idex=base,ctl" : specify both base and ctl
3065: * "idex=base,ctl,irq" : specify base, ctl, and irq number
3066: * "idex=autotune" : driver will attempt to tune interface speed
3067: * to the fastest PIO mode supported,
3068: * for all drives on this interface.
3069: * Not fully supported by all chipset types,
3070: * and quite likely to cause trouble with
3071: * older/odd IDE drives.
3072: * "idex=noautotune" : driver will NOT attempt to tune interface speed
3073: * This is the default for most chipsets,
3074: * except the cmd640.
3075: * "idex=serialize" : do not overlap operations on idex and ide(x^1)
3076: *
3077: * The following are valid ONLY on ide0,
3078: * and the defaults for the base,ctl ports must not be altered.
3079: *
3080: * "ide0=dtc2278" : probe/support DTC2278 interface
3081: * "ide0=ht6560b" : probe/support HT6560B interface
3082: * "ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
3083: * (not for PCI -- automatically detected)
3084: * "ide0=qd6580" : probe/support qd6580 interface
3085: * "ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
3086: * "ide0=umc8672" : probe/support umc8672 chipsets
3087: */
3088: void ide_setup (char *s)
3089: {
3090: int i, vals[3];
3091: ide_hwif_t *hwif;
3092: ide_drive_t *drive;
3093: unsigned int hw, unit;
3094: const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
3095: const char max_hwif = '0' + (MAX_HWIFS - 1);
3096:
3097: printk("ide_setup: %s", s);
3098: init_ide_data ();
3099:
3100: /*
3101: * Look for drive options: "hdx="
3102: */
3103: if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
3104: const char *hd_words[] = {"none", "noprobe", "nowerr", "cdrom",
3105: "serialize", "autotune", "noautotune",
3106: "slow", "ide-scsi", NULL};
3107: unit = s[2] - 'a';
3108: hw = unit / MAX_DRIVES;
3109: unit = unit % MAX_DRIVES;
3110: hwif = &ide_hwifs[hw];
3111: drive = &hwif->drives[unit];
3112: switch (match_parm(&s[3], hd_words, vals, 3)) {
3113: case -1: /* "none" */
3114: drive->nobios = 1; /* drop into "noprobe" */
3115: case -2: /* "noprobe" */
3116: drive->noprobe = 1;
3117: goto done;
3118: case -3: /* "nowerr" */
3119: drive->bad_wstat = BAD_R_STAT;
3120: hwif->noprobe = 0;
3121: goto done;
3122: case -4: /* "cdrom" */
3123: drive->present = 1;
3124: drive->media = ide_cdrom;
3125: hwif->noprobe = 0;
3126: goto done;
3127: case -5: /* "serialize" */
3128: printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
3129: goto do_serialize;
3130: case -6: /* "autotune" */
3131: drive->autotune = 1;
3132: goto done;
3133: case -7: /* "noautotune" */
3134: drive->autotune = 2;
3135: goto done;
3136: case -8: /* "slow" */
3137: drive->slow = 1;
3138: goto done;
3139: case -9: /* "ide-scsi" */
3140: drive->ide_scsi = 1;
3141: goto done;
3142: case 3: /* cyl,head,sect */
3143: drive->media = ide_disk;
3144: drive->cyl = drive->bios_cyl = vals[0];
3145: drive->head = drive->bios_head = vals[1];
3146: drive->sect = drive->bios_sect = vals[2];
3147: drive->present = 1;
3148: drive->forced_geom = 1;
3149: hwif->noprobe = 0;
3150: goto done;
3151: default:
3152: goto bad_option;
3153: }
3154: }
3155:
3156: if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
3157: goto bad_option;
3158: /*
3159: * Look for bus speed option: "idebus="
3160: */
3161: if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
3162: if (match_parm(&s[6], NULL, vals, 1) != 1)
3163: goto bad_option;
3164: if (vals[0] >= 20 && vals[0] <= 66)
3165: idebus_parameter = vals[0];
3166: else
3167: printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
3168: goto done;
3169: }
3170: /*
3171: * Look for interface options: "idex="
3172: */
3173: if (s[3] >= '0' && s[3] <= max_hwif) {
3174: /*
3175: * Be VERY CAREFUL changing this: note hardcoded indexes below
3176: */
3177: const char *ide_words[] = {"noprobe", "serialize", "autotune", "noautotune",
3178: "qd6580", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", "dc4030", NULL};
3179: hw = s[3] - '0';
3180: hwif = &ide_hwifs[hw];
3181: i = match_parm(&s[4], ide_words, vals, 3);
3182:
3183: /*
3184: * Cryptic check to ensure chipset not already set for hwif:
3185: */
3186: if (i > 0 || i <= -5) {
3187: if (hwif->chipset != ide_unknown)
3188: goto bad_option;
3189: if (i <= -5) {
3190: if (ide_hwifs[1].chipset != ide_unknown)
3191: goto bad_option;
3192: /*
3193: * Interface keywords work only for ide0:
3194: */
3195: if (hw != 0)
3196: goto bad_hwif;
3197: }
3198: }
3199:
3200: switch (i) {
3201: #ifdef CONFIG_BLK_DEV_PROMISE
3202: case -11: /* "dc4030" */
3203: {
3204: setup_dc4030(hwif);
3205: goto done;
3206: }
3207: #endif /* CONFIG_BLK_DEV_PROMISE */
3208: #ifdef CONFIG_BLK_DEV_ALI14XX
3209: case -10: /* "ali14xx" */
3210: {
3211: extern void init_ali14xx (void);
3212: init_ali14xx();
3213: goto done;
3214: }
3215: #endif /* CONFIG_BLK_DEV_ALI14XX */
3216: #ifdef CONFIG_BLK_DEV_UMC8672
3217: case -9: /* "umc8672" */
3218: {
3219: extern void init_umc8672 (void);
3220: init_umc8672();
3221: goto done;
3222: }
3223: #endif /* CONFIG_BLK_DEV_UMC8672 */
3224: #ifdef CONFIG_BLK_DEV_DTC2278
3225: case -8: /* "dtc2278" */
3226: {
3227: extern void init_dtc2278 (void);
3228: init_dtc2278();
3229: goto done;
3230: }
3231: #endif /* CONFIG_BLK_DEV_DTC2278 */
3232: #ifdef CONFIG_BLK_DEV_CMD640
3233: case -7: /* "cmd640_vlb" */
3234: {
3235: extern int cmd640_vlb; /* flag for cmd640.c */
3236: cmd640_vlb = 1;
3237: goto done;
3238: }
3239: #endif /* CONFIG_BLK_DEV_CMD640 */
3240: #ifdef CONFIG_BLK_DEV_HT6560B
3241: case -6: /* "ht6560b" */
3242: {
3243: extern void init_ht6560b (void);
3244: init_ht6560b();
3245: goto done;
3246: }
3247: #endif /* CONFIG_BLK_DEV_HT6560B */
3248: #if CONFIG_BLK_DEV_QD6580
3249: case -5: /* "qd6580" (has secondary i/f) */
3250: {
3251: extern void init_qd6580 (void);
3252: init_qd6580();
3253: goto done;
3254: }
3255: #endif /* CONFIG_BLK_DEV_QD6580 */
3256: case -4: /* "noautotune" */
3257: hwif->drives[0].autotune = 2;
3258: hwif->drives[1].autotune = 2;
3259: goto done;
3260: case -3: /* "autotune" */
3261: hwif->drives[0].autotune = 1;
3262: hwif->drives[1].autotune = 1;
3263: goto done;
3264: case -2: /* "serialize" */
3265: do_serialize:
3266: ide_hwifs[hw].serialized = 1; /* serialize */
3267: ide_hwifs[hw^1].serialized = 1; /* with mate */
3268: goto done;
3269:
3270: case -1: /* "noprobe" */
3271: hwif->noprobe = 1;
3272: goto done;
3273:
3274: case 1: /* base */
3275: vals[1] = vals[0] + 0x206; /* default ctl */
3276: case 2: /* base,ctl */
3277: vals[2] = 0; /* default irq = probe for it */
3278: case 3: /* base,ctl,irq */
3279: hwif->io_base = vals[0];
3280: hwif->ctl_port = vals[1];
3281: hwif->irq = vals[2];
3282: hwif->noprobe = 0;
3283: hwif->chipset = ide_generic;
3284: goto done;
3285:
3286: case 0: goto bad_option;
3287: default:
3288: printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
3289: return;
3290: }
3291: }
3292: bad_option:
3293: printk(" -- BAD OPTION\n");
3294: return;
3295: bad_hwif:
3296: printk("-- NOT SUPPORTED ON ide%d", hw);
3297: done:
3298: printk("\n");
3299: }
3300:
3301: /*
3302: * This routine is called from the partition-table code in genhd.c
3303: * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
3304: *
3305: * The second parameter, "xparm", determines exactly how the translation
3306: * will be handled:
3307: * 0 = convert to CHS with fewer than 1024 cyls
3308: * using the same method as Ontrack DiskManager.
3309: * 1 = same as "0", plus offset everything by 63 sectors.
3310: * -1 = similar to "0", plus redirect sector 0 to sector 1.
3311: * >1 = convert to a CHS geometry with "xparm" heads.
3312: *
3313: * Returns 0 if the translation was not possible, if the device was not
3314: * an IDE disk drive, or if a geometry was "forced" on the commandline.
3315: * Returns 1 if the geometry translation was successful.
3316: */
3317: int ide_xlate_1024 (kdev_t i_rdev, int xparm, const char *msg)
3318: {
3319: ide_drive_t *drive;
3320: static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
3321: const byte *heads = head_vals;
3322: unsigned long tracks;
3323:
3324: if ((drive = get_info_ptr(i_rdev)) == NULL || drive->forced_geom)
3325: return 0;
3326:
3327: if (xparm > 1 && xparm <= drive->bios_head && drive->bios_sect == 63)
3328: return 0; /* we already have a translation */
3329:
3330: printk("%s ", msg);
3331:
3332: if (drive->id) {
3333: drive->cyl = drive->id->cyls;
3334: drive->head = drive->id->heads;
3335: drive->sect = drive->id->sectors;
3336: }
3337: drive->bios_cyl = drive->cyl;
3338: drive->bios_head = drive->head;
3339: drive->bios_sect = drive->sect;
3340: drive->special.b.set_geometry = 1;
3341:
3342: tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
3343: drive->bios_sect = 63;
3344: if (xparm > 1) {
3345: drive->bios_head = xparm;
3346: drive->bios_cyl = tracks / drive->bios_head;
3347: } else {
3348: while (drive->bios_cyl >= 1024) {
3349: drive->bios_head = *heads;
3350: drive->bios_cyl = tracks / drive->bios_head;
3351: if (0 == *++heads)
3352: break;
3353: }
3354: #if FAKE_FDISK_FOR_EZDRIVE
3355: if (xparm == -1) {
3356: drive->remap_0_to_1 = 1;
3357: msg = "0->1";
3358: } else
3359: #endif /* FAKE_FDISK_FOR_EZDRIVE */
3360: if (xparm == 1) {
3361: drive->sect0 = 63;
3362: drive->bios_cyl = (tracks - 1) / drive->bios_head;
3363: msg = "+63";
3364: }
3365: printk("[remap %s] ", msg);
3366: }
3367: drive->part[0].nr_sects = current_capacity(drive);
3368: printk("[%d/%d/%d]", drive->bios_cyl, drive->bios_head, drive->bios_sect);
3369: return 1;
3370: }
3371:
3372: #if MAX_HWIFS > 1
3373: /*
3374: * save_match() is used to simplify logic in init_irq() below.
3375: *
3376: * A loophole here is that we may not know about a particular
3377: * hwif's irq until after that hwif is actually probed/initialized..
3378: * This could be a problem for the case where an hwif is on a
3379: * dual interface that requires serialization (eg. cmd640) and another
3380: * hwif using one of the same irqs is initialized beforehand.
3381: *
3382: * This routine detects and reports such situations, but does not fix them.
3383: */
3384: static void save_match (ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
3385: {
3386: ide_hwif_t *m = *match;
3387:
3388: if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
3389: if (!new->hwgroup)
3390: return;
3391: printk("%s: potential irq problem with %s and %s\n", hwif->name, new->name, m->name);
3392: }
3393: if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
3394: *match = new;
3395: }
3396: #endif /* MAX_HWIFS > 1 */
3397:
3398: /*
3399: * This routine sets up the irq for an ide interface, and creates a new
3400: * hwgroup for the irq/hwif if none was previously assigned.
3401: *
3402: * Much of the code is for correctly detecting/handling irq sharing
3403: * and irq serialization situations. This is somewhat complex because
3404: * it handles static as well as dynamic (PCMCIA) IDE interfaces.
3405: *
3406: * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
3407: * interrupts completely disabled. This can be bad for interrupt latency,
3408: * but anything else has led to problems on some machines. We re-enable
3409: * interrupts as much as we can safely do in most places.
3410: */
3411: static int init_irq (ide_hwif_t *hwif)
3412: {
3413: unsigned long flags;
3414: #if MAX_HWIFS > 1
3415: unsigned int index;
3416: #endif /* MAX_HWIFS > 1 */
3417: ide_hwgroup_t *hwgroup;
3418: ide_hwif_t *match = NULL;
3419:
3420: save_flags(flags);
3421: cli();
3422:
3423: hwif->hwgroup = NULL;
3424: #if MAX_HWIFS > 1
3425: /*
3426: * Group up with any other hwifs that share our irq(s).
3427: */
3428: for (index = 0; index < MAX_HWIFS; index++) {
3429: ide_hwif_t *h = &ide_hwifs[index];
3430: if (h->hwgroup) { /* scan only initialized hwif's */
3431: if (hwif->irq == h->irq) {
3432: hwif->sharing_irq = h->sharing_irq = 1;
3433: save_match(hwif, h, &match);
3434: }
3435: if (hwif->serialized) {
3436: ide_hwif_t *mate = &ide_hwifs[hwif->index^1];
3437: if (index == mate->index || h->irq == mate->irq)
3438: save_match(hwif, h, &match);
3439: }
3440: if (h->serialized) {
3441: ide_hwif_t *mate = &ide_hwifs[h->index^1];
3442: if (hwif->irq == mate->irq)
3443: save_match(hwif, h, &match);
3444: }
3445: }
3446: }
3447: #endif /* MAX_HWIFS > 1 */
3448: /*
3449: * If we are still without a hwgroup, then form a new one
3450: */
3451: if (match) {
3452: hwgroup = match->hwgroup;
3453: } else {
3454: hwgroup = kmalloc(sizeof(ide_hwgroup_t), GFP_KERNEL);
3455: hwgroup->hwif = hwgroup->next_hwif = hwif->next = hwif;
3456: hwgroup->rq = NULL;
3457: hwgroup->handler = NULL;
3458: if (hwif->drives[0].present)
3459: hwgroup->drive = &hwif->drives[0];
3460: else
3461: hwgroup->drive = &hwif->drives[1];
3462: hwgroup->poll_timeout = 0;
3463: hwgroup->active = 0;
3464: init_timer(&hwgroup->timer);
3465: hwgroup->timer.function = &timer_expiry;
3466: hwgroup->timer.data = (unsigned long) hwgroup;
3467: }
3468:
3469: /*
3470: * Allocate the irq, if not already obtained for another hwif
3471: */
3472: if (!match || match->irq != hwif->irq) {
3473: if (request_irq(hwif->irq, ide_intr, SA_INTERRUPT, hwif->name, hwgroup)) {
3474: if (!match)
3475: kfree(hwgroup);
3476: restore_flags(flags);
3477: return 1;
3478: }
3479: }
3480:
3481: /*
3482: * Everything is okay, so link us into the hwgroup
3483: */
3484: hwif->hwgroup = hwgroup;
3485: hwif->next = hwgroup->hwif->next;
3486: hwgroup->hwif->next = hwif;
3487:
3488: restore_flags(flags); /* safe now that hwif->hwgroup is set up */
3489:
3490: printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
3491: hwif->io_base, hwif->io_base+7, hwif->ctl_port, hwif->irq);
3492: if (match)
3493: printk(" (%sed with %s)", hwif->sharing_irq ? "shar" : "serializ", match->name);
3494: printk("\n");
3495: return 0;
3496: }
3497:
3498: static struct file_operations ide_fops = {
3499: NULL, /* lseek - default */
3500: block_read, /* read - general block-dev read */
3501: block_write, /* write - general block-dev write */
3502: NULL, /* readdir - bad */
3503: NULL, /* select */
3504: ide_ioctl, /* ioctl */
3505: NULL, /* mmap */
3506: ide_open, /* open */
3507: ide_release, /* release */
3508: block_fsync /* fsync */
3509: ,NULL, /* fasync */
3510: ide_check_media_change, /* check_media_change */
3511: revalidate_disk /* revalidate */
3512: };
3513:
3514: #ifdef CONFIG_PCI
3515: #if defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON)
3516:
3517: typedef void (ide_pci_init_proc_t)(byte, byte);
3518:
3519: /*
3520: * ide_probe_pci() scans PCI for a specific vendor/device function,
3521: * and invokes the supplied init routine for each instance detected.
3522: */
3523: static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
3524: {
3525: unsigned long flags;
3526: unsigned index;
3527: byte fn, bus;
3528:
3529: save_flags(flags);
3530: cli();
3531: for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
3532: init (bus, fn + func_adj);
3533: }
3534: restore_flags(flags);
3535: }
3536:
3537: #endif /* defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON) */
3538:
3539: static void ide_probe_promise_20246(void)
3540: {
3541: byte fn, bus;
3542: unsigned short io[6], count = 0;
3543: unsigned int reg, tmp, i;
3544: ide_hwif_t *hwif;
3545:
3546: memset(io, 0, 6 * sizeof(unsigned short));
3547: if (pcibios_find_device(PCI_VENDOR_ID_PROMISE, PCI_DEVICE_ID_PROMISE_20246, 0, &bus, &fn))
3548: return;
3549: printk("ide: Promise Technology IDE Ultra-DMA 33 on PCI bus %d function %d\n", bus, fn);
3550: for (reg = PCI_BASE_ADDRESS_0; reg <= PCI_BASE_ADDRESS_5; reg += 4) {
3551: pcibios_read_config_dword(bus, fn, reg, &tmp);
3552: if (tmp & PCI_BASE_ADDRESS_SPACE_IO)
3553: io[count++] = tmp & PCI_BASE_ADDRESS_IO_MASK;
3554: }
3555: for (i = 2; i < 4; i++) {
3556: hwif = ide_hwifs + i;
3557: if (hwif->chipset == ide_generic) {
3558: printk("ide%d: overridden with command line parameter\n", i);
3559: return;
3560: }
3561: tmp = (i - 2) * 2;
3562: if (!io[tmp] || !io[tmp + 1]) {
3563: printk("ide%d: invalid port address %x, %x -- aborting\n", i, io[tmp], io[tmp + 1]);
3564: return;
3565: }
3566: hwif->io_base = io[tmp];
3567: hwif->ctl_port = io[tmp + 1] + 2;
3568: hwif->noprobe = 0;
3569: }
3570: #ifdef CONFIG_BLK_DEV_TRITON
3571: ide_init_promise (bus, fn, &ide_hwifs[2], &ide_hwifs[3], io[4]);
3572: #endif /* CONFIG_BLK_DEV_TRITON */
3573: }
3574:
3575: #endif /* CONFIG_PCI */
3576:
3577: /*
3578: * ide_init_pci() finds/initializes "known" PCI IDE interfaces
3579: *
3580: * This routine should ideally be using pcibios_find_class() to find
3581: * all IDE interfaces, but that function causes some systems to "go weird".
3582: */
3583: static void probe_for_hwifs (void)
3584: {
3585: #ifdef CONFIG_PCI
3586: /*
3587: * Find/initialize PCI IDE interfaces
3588: */
3589: if (pcibios_present()) {
3590: #ifdef CONFIG_BLK_DEV_RZ1000
3591: ide_pci_init_proc_t init_rz1000;
3592: ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
3593: ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, &init_rz1000, 0);
3594: #endif /* CONFIG_BLK_DEV_RZ1000 */
3595: #ifdef CONFIG_BLK_DEV_TRITON
3596: /*
3597: * Apparently the BIOS32 services on Intel motherboards are
3598: * buggy and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
3599: * So instead, we search for PCI_DEVICE_ID_INTEL_82371_0,
3600: * and then add 1.
3601: */
3602: ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
3603: ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_1, &ide_init_triton, 0);
3604: ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB, &ide_init_triton, 0);
3605: #endif /* CONFIG_BLK_DEV_TRITON */
3606: ide_probe_promise_20246();
3607: }
3608: #endif /* CONFIG_PCI */
3609: #ifdef CONFIG_BLK_DEV_CMD640
3610: {
3611: extern void ide_probe_for_cmd640x (void);
3612: ide_probe_for_cmd640x();
3613: }
3614: #endif
3615: #ifdef CONFIG_BLK_DEV_PROMISE
3616: init_dc4030();
3617: #endif
3618: }
3619:
3620: static int hwif_init (int h)
3621: {
3622: ide_hwif_t *hwif = &ide_hwifs[h];
3623: void (*rfn)(void);
3624:
3625: if (!hwif->present)
3626: return 0;
3627: if (!hwif->irq) {
3628: if (!(hwif->irq = default_irqs[h])) {
3629: printk("%s: DISABLED, NO IRQ\n", hwif->name);
3630: return (hwif->present = 0);
3631: }
3632: }
3633: #ifdef CONFIG_BLK_DEV_HD
3634: if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
3635: printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
3636: return (hwif->present = 0);
3637: }
3638: #endif /* CONFIG_BLK_DEV_HD */
3639:
3640: hwif->present = 0; /* we set it back to 1 if all is ok below */
3641: switch (hwif->major) {
3642: case IDE0_MAJOR: rfn = &do_ide0_request; break;
3643: #if MAX_HWIFS > 1
3644: case IDE1_MAJOR: rfn = &do_ide1_request; break;
3645: #endif
3646: #if MAX_HWIFS > 2
3647: case IDE2_MAJOR: rfn = &do_ide2_request; break;
3648: #endif
3649: #if MAX_HWIFS > 3
3650: case IDE3_MAJOR: rfn = &do_ide3_request; break;
3651: #endif
3652: default:
3653: printk("%s: request_fn NOT DEFINED\n", hwif->name);
3654: return (hwif->present = 0);
3655: }
3656: if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3657: printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3658: } else if (init_irq (hwif)) {
3659: printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3660: (void) unregister_blkdev (hwif->major, hwif->name);
3661: } else {
3662: init_gendisk(hwif);
3663: blk_dev[hwif->major].request_fn = rfn;
3664: read_ahead[hwif->major] = 8; /* (4kB) */
3665: hwif->present = 1; /* success */
3666: }
3667: return hwif->present;
3668: }
3669:
3670: /*
3671: * This is gets invoked once during initialization, to set *everything* up
3672: */
3673: int ide_init (void)
3674: {
3675: int index;
3676:
3677: init_ide_data ();
3678: /*
3679: * Probe for special "known" interface chipsets
3680: */
3681: probe_for_hwifs ();
3682:
3683: /*
3684: * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
3685: */
3686: for (index = 0; index < MAX_HWIFS; ++index)
3687: probe_hwif (&ide_hwifs[index]);
3688: for (index = 0; index < MAX_HWIFS; ++index)
3689: hwif_init (index);
3690:
3691: #ifdef CONFIG_BLK_DEV_IDETAPE
3692: idetape_register_chrdev(); /* Register character device interface to the ide tape */
3693: #endif /* CONFIG_BLK_DEV_IDETAPE */
3694:
3695: return 0;
3696: }
3697:
3698: #ifdef CONFIG_BLK_DEV_IDE_PCMCIA
3699: int ide_register(int io_base, int ctl_port, int irq)
3700: {
3701: int index, i, rc = -1;
3702: ide_hwif_t *hwif;
3703: ide_drive_t *drive;
3704: unsigned long flags;
3705:
3706: save_flags(flags);
3707: cli();
3708: for (index = 0; index < MAX_HWIFS; ++index) {
3709: hwif = &ide_hwifs[index];
3710: if (hwif->present) {
3711: if (hwif->io_base == io_base || hwif->ctl_port == ctl_port)
3712: break; /* this ide port already exists */
3713: } else {
3714: hwif->io_base = io_base;
3715: hwif->ctl_port = ctl_port;
3716: hwif->irq = irq;
3717: hwif->noprobe = 0;
3718: probe_hwif(hwif);
3719: if (!hwif_init(index))
3720: break;
3721: for (i = 0; i < hwif->gd->nr_real; i++) {
3722: drive = &hwif->drives[i];
3723: revalidate_disk(MKDEV(hwif->major, i<<PARTN_BITS));
3724: #ifdef CONFIG_BLK_DEV_IDECD
3725: if (drive->present && drive->media == ide_cdrom)
3726: ide_cdrom_setup(drive);
3727: #endif /* CONFIG_BLK_DEV_IDECD */
3728: }
3729: rc = index;
3730: break;
3731: }
3732: }
3733: restore_flags(flags);
3734: return rc;
3735: }
3736:
3737: void ide_unregister (unsigned int index)
3738: {
3739: struct gendisk *gd, **gdp;
3740: ide_hwif_t *hwif, *g;
3741: ide_hwgroup_t *hwgroup;
3742: int irq_count = 0;
3743: unsigned long flags;
3744:
3745: if (index >= MAX_HWIFS)
3746: return;
3747: save_flags(flags);
3748: cli();
3749: hwif = &ide_hwifs[index];
3750: if (!hwif->present || hwif->drives[0].busy || hwif->drives[1].busy) {
3751: restore_flags(flags);
3752: return;
3753: }
3754: hwif->present = 0;
3755: hwgroup = hwif->hwgroup;
3756:
3757: /*
3758: * free the irq if we were the only hwif using it
3759: */
3760: g = hwgroup->hwif;
3761: do {
3762: if (g->irq == hwif->irq)
3763: ++irq_count;
3764: g = g->next;
3765: } while (g != hwgroup->hwif);
3766: if (irq_count == 1)
3767: free_irq(hwif->irq, hwgroup);
3768:
3769: /*
3770: * Note that we only release the standard ports,
3771: * and do not even try to handle any extra ports
3772: * allocated for weird IDE interface chipsets.
3773: */
3774: release_region(hwif->io_base, 8);
3775: release_region(hwif->ctl_port, 1);
3776:
3777: /*
3778: * Remove us from the hwgroup, and free
3779: * the hwgroup if we were the only member
3780: */
3781: while (hwgroup->hwif->next != hwif)
3782: hwgroup->hwif = hwgroup->hwif->next;
3783: hwgroup->hwif->next = hwif->next;
3784: if (hwgroup->hwif == hwif)
3785: hwgroup->hwif = hwif->next;
3786: if (hwgroup->next_hwif == hwif)
3787: hwgroup->next_hwif = hwif->next;
3788: if (hwgroup->hwif == hwif)
3789: kfree(hwgroup);
3790:
3791: /*
3792: * Remove us from the kernel's knowledge
3793: */
3794: unregister_blkdev(hwif->major, hwif->name);
3795: kfree(blksize_size[hwif->major]);
3796: blk_dev[hwif->major].request_fn = NULL;
3797: blksize_size[hwif->major] = NULL;
3798: for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next))
3799: if (*gdp == hwif->gd)
3800: break;
3801: if (*gdp == NULL)
3802: printk("gd not in disk chain!\n");
3803: else {
3804: gd = *gdp; *gdp = gd->next;
3805: kfree(gd->sizes);
3806: kfree(gd->part);
3807: kfree(gd);
3808: }
3809: init_hwif_data (index); /* restore hwif data to pristine status */
3810: restore_flags(flags);
3811: }
3812: #endif /* CONFIG_BLK_DEV_IDE_PCMCIA */
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