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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: #ifdef MACH
413: drive->name[2] = '0' + (index * MAX_DRIVES) + unit;
414: #else
415: drive->name[2] = 'a' + (index * MAX_DRIVES) + unit;
416: #endif
417: }
418: }
419:
420: /*
421: * init_ide_data() sets reasonable default values into all fields
422: * of all instances of the hwifs and drives, but only on the first call.
423: * Subsequent calls have no effect (they don't wipe out anything).
424: *
425: * This routine is normally called at driver initialization time,
426: * but may also be called MUCH earlier during kernel "command-line"
427: * parameter processing. As such, we cannot depend on any other parts
428: * of the kernel (such as memory allocation) to be functioning yet.
429: *
430: * This is too bad, as otherwise we could dynamically allocate the
431: * ide_drive_t structs as needed, rather than always consuming memory
432: * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
433: */
434: #define MAGIC_COOKIE 0x12345678
435: static void init_ide_data (void)
436: {
437: unsigned int index;
438: static unsigned long magic_cookie = MAGIC_COOKIE;
439:
440: if (magic_cookie != MAGIC_COOKIE)
441: return; /* already initialized */
442: magic_cookie = 0;
443:
444: for (index = 0; index < MAX_HWIFS; ++index)
445: init_hwif_data(index);
446:
447: idebus_parameter = 0;
448: system_bus_speed = 0;
449: }
450:
451: /*
452: * ide_system_bus_speed() returns what we think is the system VESA/PCI
453: * bus speed (in Mhz). This is used for calculating interface PIO timings.
454: * The default is 40 for known PCI systems, 50 otherwise.
455: * The "idebus=xx" parameter can be used to override this value.
456: * The actual value to be used is computed/displayed the first time through.
457: */
458: int ide_system_bus_speed (void)
459: {
460: if (!system_bus_speed) {
461: if (idebus_parameter)
462: system_bus_speed = idebus_parameter; /* user supplied value */
463: #ifdef CONFIG_PCI
464: else if (pcibios_present())
465: system_bus_speed = 40; /* safe default value for PCI */
466: #endif /* CONFIG_PCI */
467: else
468: system_bus_speed = 50; /* safe default value for VESA and PCI */
469: printk("ide: Assuming %dMhz system bus speed for PIO modes; override with idebus=xx\n", system_bus_speed);
470: }
471: return system_bus_speed;
472: }
473:
474: #if SUPPORT_VLB_SYNC
475: /*
476: * Some localbus EIDE interfaces require a special access sequence
477: * when using 32-bit I/O instructions to transfer data. We call this
478: * the "vlb_sync" sequence, which consists of three successive reads
479: * of the sector count register location, with interrupts disabled
480: * to ensure that the reads all happen together.
481: */
482: static inline void do_vlb_sync (unsigned short port) {
483: (void) inb (port);
484: (void) inb (port);
485: (void) inb (port);
486: }
487: #endif /* SUPPORT_VLB_SYNC */
488:
489: /*
490: * This is used for most PIO data transfers *from* the IDE interface
491: */
492: void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
493: {
494: unsigned short io_base = HWIF(drive)->io_base;
495: unsigned short data_reg = io_base+IDE_DATA_OFFSET;
496: byte io_32bit = drive->io_32bit;
497:
498: if (io_32bit) {
499: #if SUPPORT_VLB_SYNC
500: if (io_32bit & 2) {
501: cli();
502: do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
503: insl(data_reg, buffer, wcount);
504: if (drive->unmask)
505: sti();
506: } else
507: #endif /* SUPPORT_VLB_SYNC */
508: insl(data_reg, buffer, wcount);
509: } else {
510: #if SUPPORT_SLOW_DATA_PORTS
511: if (drive->slow) {
512: unsigned short *ptr = (unsigned short *) buffer;
513: while (wcount--) {
514: *ptr++ = inw_p(data_reg);
515: *ptr++ = inw_p(data_reg);
516: }
517: } else
518: #endif /* SUPPORT_SLOW_DATA_PORTS */
519: insw(data_reg, buffer, wcount<<1);
520: }
521: }
522:
523: /*
524: * This is used for most PIO data transfers *to* the IDE interface
525: */
526: void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
527: {
528: unsigned short io_base = HWIF(drive)->io_base;
529: unsigned short data_reg = io_base+IDE_DATA_OFFSET;
530: byte io_32bit = drive->io_32bit;
531:
532: if (io_32bit) {
533: #if SUPPORT_VLB_SYNC
534: if (io_32bit & 2) {
535: cli();
536: do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
537: outsl(data_reg, buffer, wcount);
538: if (drive->unmask)
539: sti();
540: } else
541: #endif /* SUPPORT_VLB_SYNC */
542: outsl(data_reg, buffer, wcount);
543: } else {
544: #if SUPPORT_SLOW_DATA_PORTS
545: if (drive->slow) {
546: unsigned short *ptr = (unsigned short *) buffer;
547: while (wcount--) {
548: outw_p(*ptr++, data_reg);
549: outw_p(*ptr++, data_reg);
550: }
551: } else
552: #endif /* SUPPORT_SLOW_DATA_PORTS */
553: outsw(data_reg, buffer, wcount<<1);
554: }
555: }
556:
557: /*
558: * The following routines are mainly used by the ATAPI drivers.
559: *
560: * These routines will round up any request for an odd number of bytes,
561: * so if an odd bytecount is specified, be sure that there's at least one
562: * extra byte allocated for the buffer.
563: */
564: void atapi_input_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount)
565: {
566: ++bytecount;
567: ide_input_data (drive, buffer, bytecount / 4);
568: if ((bytecount & 0x03) >= 2)
569: insw (IDE_DATA_REG, ((byte *)buffer) + (bytecount & ~0x03), 1);
570: }
571:
572: void atapi_output_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount)
573: {
574: ++bytecount;
575: ide_output_data (drive, buffer, bytecount / 4);
576: if ((bytecount & 0x03) >= 2)
577: outsw (IDE_DATA_REG, ((byte *)buffer) + (bytecount & ~0x03), 1);
578: }
579:
580: /*
581: * This should get invoked any time we exit the driver to
582: * wait for an interrupt response from a drive. handler() points
583: * at the appropriate code to handle the next interrupt, and a
584: * timer is started to prevent us from waiting forever in case
585: * something goes wrong (see the timer_expiry() handler later on).
586: */
587: void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout)
588: {
589: ide_hwgroup_t *hwgroup = HWGROUP(drive);
590: #ifdef DEBUG
591: if (hwgroup->handler != NULL) {
592: printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
593: drive->name, hwgroup->handler, handler);
594: }
595: #endif
596: hwgroup->handler = handler;
597: hwgroup->timer.expires = jiffies + timeout;
598: add_timer(&(hwgroup->timer));
599: }
600:
601: /*
602: * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
603: * value for this drive (from its reported identification information).
604: *
605: * Returns: 1 if lba_capacity looks sensible
606: * 0 otherwise
607: */
608: static int lba_capacity_is_ok (struct hd_driveid *id)
609: {
610: unsigned long lba_sects = id->lba_capacity;
611: unsigned long chs_sects = id->cyls * id->heads * id->sectors;
612: unsigned long _10_percent = chs_sects / 10;
613:
614: /* very large drives (8GB+) may lie about the number of cylinders */
615: if (id->cyls == 16383 && id->heads == 16 && id->sectors == 63 && lba_sects > chs_sects) {
616: return 1; /* lba_capacity is our only option */
617: }
618: /* perform a rough sanity check on lba_sects: within 10% is "okay" */
619: if ((lba_sects - chs_sects) < _10_percent)
620: return 1; /* lba_capacity is good */
621:
622: /* some drives have the word order reversed */
623: lba_sects = (lba_sects << 16) | (lba_sects >> 16);
624: if ((lba_sects - chs_sects) < _10_percent) {
625: id->lba_capacity = lba_sects; /* fix it */
626: return 1; /* lba_capacity is (now) good */
627: }
628: return 0; /* lba_capacity value is bad */
629: }
630:
631: /*
632: * current_capacity() returns the capacity (in sectors) of a drive
633: * according to its current geometry/LBA settings.
634: */
635: static unsigned long current_capacity (ide_drive_t *drive)
636: {
637: struct hd_driveid *id = drive->id;
638: unsigned long capacity = drive->cyl * drive->head * drive->sect;
639:
640: if (!drive->present)
641: return 0;
642: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
643: if (drive->media == ide_floppy)
644: return idefloppy_capacity(drive);
645: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
646: if (drive->media != ide_disk)
647: return 0x7fffffff; /* cdrom or tape */
648: drive->select.b.lba = 0;
649: /* Determine capacity, and use LBA if the drive properly supports it */
650: if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
651: if (id->lba_capacity >= capacity) {
652: capacity = id->lba_capacity;
653: drive->select.b.lba = 1;
654: }
655: }
656: return (capacity - drive->sect0);
657: }
658:
659: /*
660: * ide_geninit() is called exactly *once* for each major, from genhd.c,
661: * at the beginning of the initial partition check for the drives.
662: */
663: static void ide_geninit (struct gendisk *gd)
664: {
665: unsigned int unit;
666: ide_hwif_t *hwif = gd->real_devices;
667:
668: for (unit = 0; unit < gd->nr_real; ++unit) {
669: ide_drive_t *drive = &hwif->drives[unit];
670: #ifdef CONFIG_BLK_DEV_IDECD
671: if (drive->present && drive->media == ide_cdrom)
672: ide_cdrom_setup(drive);
673: #endif /* CONFIG_BLK_DEV_IDECD */
674: #ifdef CONFIG_BLK_DEV_IDETAPE
675: if (drive->present && drive->media == ide_tape)
676: idetape_setup(drive);
677: #endif /* CONFIG_BLK_DEV_IDETAPE */
678: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
679: if (drive->present && drive->media == ide_floppy)
680: idefloppy_setup(drive);
681: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
682: drive->part[0].nr_sects = current_capacity(drive);
683: if (!drive->present || (drive->media != ide_disk && drive->media != ide_floppy) ||
684: !drive->part[0].nr_sects) {
685: drive->part[0].start_sect = -1; /* skip partition check */
686: }
687: }
688: }
689:
690: /*
691: * init_gendisk() (as opposed to ide_geninit) is called for each major device,
692: * after probing for drives, to allocate partition tables and other data
693: * structures needed for the routines in genhd.c. ide_geninit() gets called
694: * somewhat later, during the partition check.
695: */
696: static void init_gendisk (ide_hwif_t *hwif)
697: {
698: struct gendisk *gd, **gdp;
699: unsigned int unit, units, minors;
700: int *bs;
701:
702: /* figure out maximum drive number on the interface */
703: for (units = MAX_DRIVES; units > 0; --units) {
704: if (hwif->drives[units-1].present)
705: break;
706: }
707: minors = units * (1<<PARTN_BITS);
708: gd = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
709: gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
710: gd->part = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
711: bs = kmalloc (minors*sizeof(int), GFP_KERNEL);
712:
713: memset(gd->part, 0, minors * sizeof(struct hd_struct));
714:
715: /* cdroms and msdos f/s are examples of non-1024 blocksizes */
716: blksize_size[hwif->major] = bs;
717: for (unit = 0; unit < minors; ++unit)
718: *bs++ = BLOCK_SIZE;
719:
720: for (unit = 0; unit < units; ++unit)
721: hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
722:
723: gd->major = hwif->major; /* our major device number */
724: gd->major_name = IDE_MAJOR_NAME; /* treated special in genhd.c */
725: gd->minor_shift = PARTN_BITS; /* num bits for partitions */
726: gd->max_p = 1<<PARTN_BITS; /* 1 + max partitions / drive */
727: gd->max_nr = units; /* max num real drives */
728: gd->nr_real = units; /* current num real drives */
729: gd->init = ide_geninit; /* initialization function */
730: gd->real_devices= hwif; /* ptr to internal data */
731: gd->next = NULL; /* linked list of major devs */
732:
733: for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next)) ;
734: hwif->gd = *gdp = gd; /* link onto tail of list */
735: }
736:
737: static void do_reset1 (ide_drive_t *, int); /* needed below */
738:
739: #ifdef CONFIG_BLK_DEV_IDEATAPI
740: /*
741: * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
742: * during an atapi drive reset operation. If the drive has not yet responded,
743: * and we have not yet hit our maximum waiting time, then the timer is restarted
744: * for another 50ms.
745: */
746: static void atapi_reset_pollfunc (ide_drive_t *drive)
747: {
748: ide_hwgroup_t *hwgroup = HWGROUP(drive);
749: byte stat;
750:
751: OUT_BYTE (drive->select.all, IDE_SELECT_REG);
752: udelay (10);
753:
754: if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
755: printk("%s: ATAPI reset complete\n", drive->name);
756: } else {
757: if (jiffies < hwgroup->poll_timeout) {
758: ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
759: return; /* continue polling */
760: }
761: hwgroup->poll_timeout = 0; /* end of polling */
762: printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
763: do_reset1 (drive, 1); /* do it the old fashioned way */
764: return;
765: }
766: hwgroup->poll_timeout = 0; /* done polling */
767: }
768: #endif /* CONFIG_BLK_DEV_IDEATAPI */
769:
770: /*
771: * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
772: * during an ide reset operation. If the drives have not yet responded,
773: * and we have not yet hit our maximum waiting time, then the timer is restarted
774: * for another 50ms.
775: */
776: static void reset_pollfunc (ide_drive_t *drive)
777: {
778: ide_hwgroup_t *hwgroup = HWGROUP(drive);
779: ide_hwif_t *hwif = HWIF(drive);
780: byte tmp;
781:
782: if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
783: if (jiffies < hwgroup->poll_timeout) {
784: ide_set_handler (drive, &reset_pollfunc, HZ/20);
785: return; /* continue polling */
786: }
787: printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
788: } else {
789: printk("%s: reset: ", hwif->name);
790: if ((tmp = GET_ERR()) == 1)
791: printk("success\n");
792: else {
793: #if FANCY_STATUS_DUMPS
794: printk("master: ");
795: switch (tmp & 0x7f) {
796: case 1: printk("passed");
797: break;
798: case 2: printk("formatter device error");
799: break;
800: case 3: printk("sector buffer error");
801: break;
802: case 4: printk("ECC circuitry error");
803: break;
804: case 5: printk("controlling MPU error");
805: break;
806: default:printk("error (0x%02x?)", tmp);
807: }
808: if (tmp & 0x80)
809: printk("; slave: failed");
810: printk("\n");
811: #else
812: printk("failed\n");
813: #endif /* FANCY_STATUS_DUMPS */
814: }
815: }
816: hwgroup->poll_timeout = 0; /* done polling */
817: }
818:
819: /*
820: * do_reset1() attempts to recover a confused drive by resetting it.
821: * Unfortunately, resetting a disk drive actually resets all devices on
822: * the same interface, so it can really be thought of as resetting the
823: * interface rather than resetting the drive.
824: *
825: * ATAPI devices have their own reset mechanism which allows them to be
826: * individually reset without clobbering other devices on the same interface.
827: *
828: * Unfortunately, the IDE interface does not generate an interrupt to let
829: * us know when the reset operation has finished, so we must poll for this.
830: * Equally poor, though, is the fact that this may a very long time to complete,
831: * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
832: * we set a timer to poll at 50ms intervals.
833: */
834: static void do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
835: {
836: unsigned int unit;
837: unsigned long flags;
838: ide_hwif_t *hwif = HWIF(drive);
839: ide_hwgroup_t *hwgroup = HWGROUP(drive);
840:
841: save_flags(flags);
842: cli(); /* Why ? */
843:
844: #ifdef CONFIG_BLK_DEV_IDEATAPI
845: /* For an ATAPI device, first try an ATAPI SRST. */
846: if (drive->media != ide_disk) {
847: if (!do_not_try_atapi) {
848: if (!drive->keep_settings) {
849: drive->unmask = 0;
850: drive->io_32bit = 0;
851: }
852: OUT_BYTE (drive->select.all, IDE_SELECT_REG);
853: udelay (20);
854: OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
855: hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
856: ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
857: restore_flags (flags);
858: return;
859: }
860: }
861: #endif /* CONFIG_BLK_DEV_IDEATAPI */
862:
863: /*
864: * First, reset any device state data we were maintaining
865: * for any of the drives on this interface.
866: */
867: for (unit = 0; unit < MAX_DRIVES; ++unit) {
868: ide_drive_t *rdrive = &hwif->drives[unit];
869: #ifdef CONFIG_BLK_DEV_IDETAPE
870: if (rdrive->media == ide_tape)
871: rdrive->tape.reset_issued = 1;
872: #endif /* CONFIG_BLK_DEV_IDETAPE */
873: rdrive->special.all = 0;
874: rdrive->special.b.set_geometry = 1;
875: rdrive->special.b.recalibrate = 1;
876: if (OK_TO_RESET_CONTROLLER)
877: rdrive->mult_count = 0;
878: if (!rdrive->keep_settings) {
879: rdrive->mult_req = 0;
880: rdrive->unmask = 0;
881: rdrive->io_32bit = 0;
882: if (rdrive->using_dma) {
883: rdrive->using_dma = 0;
884: printk("%s: disabled DMA\n", rdrive->name);
885: }
886: }
887: if (rdrive->mult_req != rdrive->mult_count)
888: rdrive->special.b.set_multmode = 1;
889: }
890:
891: #if OK_TO_RESET_CONTROLLER
892: /*
893: * Note that we also set nIEN while resetting the device,
894: * to mask unwanted interrupts from the interface during the reset.
895: * However, due to the design of PC hardware, this will cause an
896: * immediate interrupt due to the edge transition it produces.
897: * This single interrupt gives us a "fast poll" for drives that
898: * recover from reset very quickly, saving us the first 50ms wait time.
899: */
900: OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
901: udelay(10); /* more than enough time */
902: OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
903: udelay(10); /* more than enough time */
904: hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
905: ide_set_handler (drive, &reset_pollfunc, HZ/20);
906: #endif /* OK_TO_RESET_CONTROLLER */
907:
908: restore_flags (flags);
909: }
910:
911: /*
912: * ide_do_reset() is the entry point to the drive/interface reset code.
913: */
914: void ide_do_reset (ide_drive_t *drive)
915: {
916: do_reset1 (drive, 0);
917: #ifdef CONFIG_BLK_DEV_IDETAPE
918: if (drive->media == ide_tape)
919: drive->tape.reset_issued=1;
920: #endif /* CONFIG_BLK_DEV_IDETAPE */
921: }
922:
923: /*
924: * Clean up after success/failure of an explicit drive cmd
925: */
926: void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
927: {
928: unsigned long flags;
929: struct request *rq = HWGROUP(drive)->rq;
930:
931: if (rq->cmd == IDE_DRIVE_CMD) {
932: byte *args = (byte *) rq->buffer;
933: rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
934: if (args) {
935: args[0] = stat;
936: args[1] = err;
937: args[2] = IN_BYTE(IDE_NSECTOR_REG);
938: }
939: }
940: save_flags(flags);
941: cli();
942: blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
943: HWGROUP(drive)->rq = NULL;
944: rq->rq_status = RQ_INACTIVE;
945: if (rq->sem != NULL)
946: up(rq->sem);
947: restore_flags(flags);
948: }
949:
950: /*
951: * Error reporting, in human readable form (luxurious, but a memory hog).
952: */
953: byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
954: {
955: unsigned long flags;
956: byte err = 0;
957:
958: save_flags (flags);
959: sti();
960: printk("%s: %s: status=0x%02x", drive->name, msg, stat);
961: #if FANCY_STATUS_DUMPS
962: if (drive->media == ide_disk) {
963: printk(" { ");
964: if (stat & BUSY_STAT)
965: printk("Busy ");
966: else {
967: if (stat & READY_STAT) printk("DriveReady ");
968: if (stat & WRERR_STAT) printk("DeviceFault ");
969: if (stat & SEEK_STAT) printk("SeekComplete ");
970: if (stat & DRQ_STAT) printk("DataRequest ");
971: if (stat & ECC_STAT) printk("CorrectedError ");
972: if (stat & INDEX_STAT) printk("Index ");
973: if (stat & ERR_STAT) printk("Error ");
974: }
975: printk("}");
976: }
977: #endif /* FANCY_STATUS_DUMPS */
978: printk("\n");
979: if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
980: err = GET_ERR();
981: printk("%s: %s: error=0x%02x", drive->name, msg, err);
982: #if FANCY_STATUS_DUMPS
983: if (drive->media == ide_disk) {
984: printk(" { ");
985: if (err & ICRC_ERR) printk((err & ABRT_ERR) ? "BadCRC " : "BadSector ");
986: if (err & ECC_ERR) printk("UncorrectableError ");
987: if (err & ID_ERR) printk("SectorIdNotFound ");
988: if (err & ABRT_ERR) printk("DriveStatusError ");
989: if (err & TRK0_ERR) printk("TrackZeroNotFound ");
990: if (err & MARK_ERR) printk("AddrMarkNotFound ");
991: printk("}");
992: if (err & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
993: byte cur = IN_BYTE(IDE_SELECT_REG);
994: if (cur & 0x40) { /* using LBA? */
995: printk(", LBAsect=%ld", (unsigned long)
996: ((cur&0xf)<<24)
997: |(IN_BYTE(IDE_HCYL_REG)<<16)
998: |(IN_BYTE(IDE_LCYL_REG)<<8)
999: | IN_BYTE(IDE_SECTOR_REG));
1000: } else {
1001: printk(", CHS=%d/%d/%d",
1002: (IN_BYTE(IDE_HCYL_REG)<<8) +
1003: IN_BYTE(IDE_LCYL_REG),
1004: cur & 0xf,
1005: IN_BYTE(IDE_SECTOR_REG));
1006: }
1007: if (HWGROUP(drive)->rq)
1008: printk(", sector=%ld", HWGROUP(drive)->rq->sector);
1009: }
1010: }
1011: #endif /* FANCY_STATUS_DUMPS */
1012: printk("\n");
1013: }
1014: restore_flags (flags);
1015: return err;
1016: }
1017:
1018: /*
1019: * try_to_flush_leftover_data() is invoked in response to a drive
1020: * unexpectedly having its DRQ_STAT bit set. As an alternative to
1021: * resetting the drive, this routine tries to clear the condition
1022: * by read a sector's worth of data from the drive. Of course,
1023: * this may not help if the drive is *waiting* for data from *us*.
1024: */
1025: static void try_to_flush_leftover_data (ide_drive_t *drive)
1026: {
1027: int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
1028:
1029: while (i > 0) {
1030: unsigned long buffer[16];
1031: unsigned int wcount = (i > 16) ? 16 : i;
1032: i -= wcount;
1033: ide_input_data (drive, buffer, wcount);
1034: }
1035: }
1036:
1037: /*
1038: * ide_error() takes action based on the error returned by the controller.
1039: */
1040: void ide_error (ide_drive_t *drive, const char *msg, byte stat)
1041: {
1042: struct request *rq;
1043: byte err;
1044:
1045: err = ide_dump_status(drive, msg, stat);
1046: if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
1047: return;
1048: /* retry only "normal" I/O: */
1049: if (rq->cmd == IDE_DRIVE_CMD) {
1050: rq->errors = 1;
1051: ide_end_drive_cmd(drive, stat, err);
1052: return;
1053: }
1054: if (stat & BUSY_STAT) { /* other bits are useless when BUSY */
1055: rq->errors |= ERROR_RESET;
1056: } else {
1057: if (drive->media == ide_disk && (stat & ERR_STAT)) {
1058: /* err has different meaning on cdrom and tape */
1059: if (err == ABRT_ERR) {
1060: if (drive->select.b.lba && IN_BYTE(IDE_COMMAND_REG) == WIN_SPECIFY)
1061: return; /* some newer drives don't support WIN_SPECIFY */
1062: } else if ((err & (ABRT_ERR | ICRC_ERR)) == (ABRT_ERR | ICRC_ERR))
1063: ; /* UDMA crc error -- just retry the operation */
1064: else if (err & (BBD_ERR | ECC_ERR)) /* retries won't help these */
1065: rq->errors = ERROR_MAX;
1066: else if (err & TRK0_ERR) /* help it find track zero */
1067: rq->errors |= ERROR_RECAL;
1068: else if (err & MC_ERR)
1069: drive->special.b.mc = 1;
1070: }
1071: if ((stat & DRQ_STAT) && rq->cmd != WRITE)
1072: try_to_flush_leftover_data(drive);
1073: }
1074: if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
1075: rq->errors |= ERROR_RESET; /* Mmmm.. timing problem */
1076:
1077: if (rq->errors >= ERROR_MAX) {
1078: #ifdef CONFIG_BLK_DEV_IDETAPE
1079: if (drive->media == ide_tape) {
1080: rq->errors = 0;
1081: idetape_end_request(0, HWGROUP(drive));
1082: } else
1083: #endif /* CONFIG_BLK_DEV_IDETAPE */
1084: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
1085: if (drive->media == ide_floppy) {
1086: rq->errors = 0;
1087: idefloppy_end_request(0, HWGROUP(drive));
1088: } else
1089: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
1090: #ifdef CONFIG_BLK_DEV_IDESCSI
1091: if (drive->media == ide_scsi) {
1092: rq->errors = 0;
1093: idescsi_end_request(0, HWGROUP(drive));
1094: } else
1095: #endif /* CONFIG_BLK_DEV_IDESCSI */
1096: ide_end_request(0, HWGROUP(drive));
1097: }
1098: else {
1099: if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
1100: ++rq->errors;
1101: ide_do_reset(drive);
1102: return;
1103: } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
1104: drive->special.b.recalibrate = 1;
1105: ++rq->errors;
1106: }
1107: }
1108:
1109: /*
1110: * read_intr() is the handler for disk read/multread interrupts
1111: */
1112: static void read_intr (ide_drive_t *drive)
1113: {
1114: byte stat;
1115: int i;
1116: unsigned int msect, nsect;
1117: struct request *rq;
1118:
1119: if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
1120: ide_error(drive, "read_intr", stat);
1121: return;
1122: }
1123: msect = drive->mult_count;
1124: read_next:
1125: rq = HWGROUP(drive)->rq;
1126: if (msect) {
1127: if ((nsect = rq->current_nr_sectors) > msect)
1128: nsect = msect;
1129: msect -= nsect;
1130: } else
1131: nsect = 1;
1132: ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
1133: #ifdef DEBUG
1134: printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
1135: drive->name, rq->sector, rq->sector+nsect-1,
1136: (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
1137: #endif
1138: rq->sector += nsect;
1139: rq->buffer += nsect<<9;
1140: rq->errors = 0;
1141: i = (rq->nr_sectors -= nsect);
1142: if ((rq->current_nr_sectors -= nsect) <= 0)
1143: ide_end_request(1, HWGROUP(drive));
1144: if (i > 0) {
1145: if (msect)
1146: goto read_next;
1147: ide_set_handler (drive, &read_intr, WAIT_CMD);
1148: }
1149: }
1150:
1151: /*
1152: * write_intr() is the handler for disk write interrupts
1153: */
1154: static void write_intr (ide_drive_t *drive)
1155: {
1156: byte stat;
1157: int i;
1158: ide_hwgroup_t *hwgroup = HWGROUP(drive);
1159: struct request *rq = hwgroup->rq;
1160:
1161: if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1162: #ifdef DEBUG
1163: printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
1164: drive->name, rq->sector, (unsigned long) rq->buffer,
1165: rq->nr_sectors-1);
1166: #endif
1167: if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
1168: rq->sector++;
1169: rq->buffer += 512;
1170: rq->errors = 0;
1171: i = --rq->nr_sectors;
1172: --rq->current_nr_sectors;
1173: if (rq->current_nr_sectors <= 0)
1174: ide_end_request(1, hwgroup);
1175: if (i > 0) {
1176: ide_output_data (drive, rq->buffer, SECTOR_WORDS);
1177: ide_set_handler (drive, &write_intr, WAIT_CMD);
1178: }
1179: return;
1180: }
1181: }
1182: ide_error(drive, "write_intr", stat);
1183: }
1184:
1185: /*
1186: * ide_multwrite() transfers a block of up to mcount sectors of data
1187: * to a drive as part of a disk multiple-sector write operation.
1188: */
1189: void ide_multwrite (ide_drive_t *drive, unsigned int mcount)
1190: {
1191: struct request *rq = &HWGROUP(drive)->wrq;
1192:
1193: do {
1194: unsigned int nsect = rq->current_nr_sectors;
1195: if (nsect > mcount)
1196: nsect = mcount;
1197: mcount -= nsect;
1198:
1199: ide_output_data(drive, rq->buffer, nsect<<7);
1200: #ifdef DEBUG
1201: printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
1202: drive->name, rq->sector, (unsigned long) rq->buffer,
1203: nsect, rq->nr_sectors - nsect);
1204: #endif
1205: if ((rq->nr_sectors -= nsect) <= 0)
1206: break;
1207: if ((rq->current_nr_sectors -= nsect) == 0) {
1208: if ((rq->bh = rq->bh->b_reqnext) != NULL) {
1209: rq->current_nr_sectors = rq->bh->b_size>>9;
1210: rq->buffer = rq->bh->b_data;
1211: } else {
1212: panic("%s: buffer list corrupted\n", drive->name);
1213: break;
1214: }
1215: } else {
1216: rq->buffer += nsect << 9;
1217: }
1218: } while (mcount);
1219: }
1220:
1221: /*
1222: * multwrite_intr() is the handler for disk multwrite interrupts
1223: */
1224: static void multwrite_intr (ide_drive_t *drive)
1225: {
1226: byte stat;
1227: int i;
1228: ide_hwgroup_t *hwgroup = HWGROUP(drive);
1229: struct request *rq = &hwgroup->wrq;
1230:
1231: if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
1232: if (stat & DRQ_STAT) {
1233: if (rq->nr_sectors) {
1234: ide_multwrite(drive, drive->mult_count);
1235: ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1236: return;
1237: }
1238: } else {
1239: if (!rq->nr_sectors) { /* all done? */
1240: rq = hwgroup->rq;
1241: for (i = rq->nr_sectors; i > 0;){
1242: i -= rq->current_nr_sectors;
1243: ide_end_request(1, hwgroup);
1244: }
1245: return;
1246: }
1247: }
1248: }
1249: ide_error(drive, "multwrite_intr", stat);
1250: }
1251:
1252: /*
1253: * Issue a simple drive command
1254: * The drive must be selected beforehand.
1255: */
1256: static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
1257: {
1258: ide_set_handler (drive, handler, WAIT_CMD);
1259: OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1260: OUT_BYTE(nsect,IDE_NSECTOR_REG);
1261: OUT_BYTE(cmd,IDE_COMMAND_REG);
1262: }
1263:
1264: /*
1265: * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
1266: */
1267: static void set_multmode_intr (ide_drive_t *drive)
1268: {
1269: byte stat = GET_STAT();
1270:
1271: sti();
1272: if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
1273: drive->mult_count = drive->mult_req;
1274: } else {
1275: drive->mult_req = drive->mult_count = 0;
1276: drive->special.b.recalibrate = 1;
1277: (void) ide_dump_status(drive, "set_multmode", stat);
1278: }
1279: }
1280:
1281: /*
1282: * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
1283: */
1284: static void set_geometry_intr (ide_drive_t *drive)
1285: {
1286: byte stat = GET_STAT();
1287:
1288: sti();
1289: if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1290: ide_error(drive, "set_geometry_intr", stat);
1291: }
1292:
1293: /*
1294: * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
1295: */
1296: static void recal_intr (ide_drive_t *drive)
1297: {
1298: byte stat = GET_STAT();
1299:
1300: sti();
1301: if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1302: ide_error(drive, "recal_intr", stat);
1303: }
1304:
1305: /*
1306: * mc_intr() is invoked on completion of a WIN_ACKMC cmd.
1307: */
1308: static void mc_intr (ide_drive_t *drive)
1309: {
1310: byte stat = GET_STAT();
1311:
1312: sti();
1313: if (!OK_STAT(stat,READY_STAT,BAD_STAT))
1314: ide_error(drive, "mc_intr", stat);
1315: drive->special.b.mc = 0;
1316: }
1317:
1318: /*
1319: * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
1320: */
1321: static void drive_cmd_intr (ide_drive_t *drive)
1322: {
1323: struct request *rq = HWGROUP(drive)->rq;
1324: byte *args = (byte *) rq->buffer;
1325: byte stat = GET_STAT();
1326:
1327: sti();
1328: if ((stat & DRQ_STAT) && args && args[3]) {
1329: byte io_32bit = drive->io_32bit;
1330: drive->io_32bit = 0;
1331: ide_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
1332: drive->io_32bit = io_32bit;
1333: stat = GET_STAT();
1334: }
1335: if (OK_STAT(stat,READY_STAT,BAD_STAT))
1336: ide_end_drive_cmd (drive, stat, GET_ERR());
1337: else
1338: ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
1339: }
1340:
1341: /*
1342: * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
1343: * commands to a drive. It used to do much more, but has been scaled back.
1344: */
1345: static inline void do_special (ide_drive_t *drive)
1346: {
1347: special_t *s = &drive->special;
1348:
1349: #ifdef DEBUG
1350: printk("%s: do_special: 0x%02x\n", drive->name, s->all);
1351: #endif
1352: if (s->b.set_geometry) {
1353: s->b.set_geometry = 0;
1354: if (drive->media == ide_disk && !drive->no_geom) {
1355: OUT_BYTE(drive->sect,IDE_SECTOR_REG);
1356: OUT_BYTE(drive->cyl,IDE_LCYL_REG);
1357: OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
1358: OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
1359: if (!IS_PROMISE_DRIVE)
1360: ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
1361: }
1362: } else if (s->b.recalibrate) {
1363: s->b.recalibrate = 0;
1364: if (drive->media == ide_disk && !IS_PROMISE_DRIVE)
1365: ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
1366: } else if (s->b.set_tune) {
1367: ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
1368: s->b.set_tune = 0;
1369: if (tuneproc != NULL)
1370: tuneproc(drive, drive->tune_req);
1371: } else if (s->b.set_multmode) {
1372: s->b.set_multmode = 0;
1373: if (drive->media == ide_disk) {
1374: if (drive->id && drive->mult_req > drive->id->max_multsect)
1375: drive->mult_req = drive->id->max_multsect;
1376: if (!IS_PROMISE_DRIVE)
1377: ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
1378: } else
1379: drive->mult_req = 0;
1380: } else if (s->b.mc) {
1381: s->b.mc = 0;
1382: if (drive->media == ide_disk && !IS_PROMISE_DRIVE)
1383: ide_cmd(drive, WIN_ACKMC, drive->sect, &mc_intr);
1384: } else if (s->all) {
1385: int special = s->all;
1386: s->all = 0;
1387: printk("%s: bad special flag: 0x%02x\n", drive->name, special);
1388: }
1389: }
1390:
1391: /*
1392: * This routine busy-waits for the drive status to be not "busy".
1393: * It then checks the status for all of the "good" bits and none
1394: * of the "bad" bits, and if all is okay it returns 0. All other
1395: * cases return 1 after invoking ide_error() -- caller should just return.
1396: *
1397: * This routine should get fixed to not hog the cpu during extra long waits..
1398: * That could be done by busy-waiting for the first jiffy or two, and then
1399: * setting a timer to wake up at half second intervals thereafter,
1400: * until timeout is achieved, before timing out.
1401: */
1402: int ide_wait_stat (ide_drive_t *drive, byte good, byte bad, unsigned long timeout)
1403: {
1404: byte stat;
1405: unsigned long flags;
1406:
1407: udelay(1); /* spec allows drive 400ns to assert "BUSY" */
1408: if ((stat = GET_STAT()) & BUSY_STAT) {
1409: save_flags(flags);
1410: sti();
1411: timeout += jiffies;
1412: while ((stat = GET_STAT()) & BUSY_STAT) {
1413: if (jiffies > timeout) {
1414: restore_flags(flags);
1415: ide_error(drive, "status timeout", stat);
1416: return 1;
1417: }
1418: }
1419: restore_flags(flags);
1420: }
1421: udelay(1); /* allow status to settle, then read it again */
1422: if (OK_STAT((stat = GET_STAT()), good, bad))
1423: return 0;
1424: ide_error(drive, "status error", stat);
1425: return 1;
1426: }
1427:
1428: /*
1429: * do_rw_disk() issues READ and WRITE commands to a disk,
1430: * using LBA if supported, or CHS otherwise, to address sectors.
1431: * It also takes care of issuing special DRIVE_CMDs.
1432: */
1433: static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
1434: {
1435: ide_hwif_t *hwif = HWIF(drive);
1436: unsigned short io_base = hwif->io_base;
1437: #ifdef CONFIG_BLK_DEV_PROMISE
1438: int use_promise_io = 0;
1439: #endif /* CONFIG_BLK_DEV_PROMISE */
1440:
1441: OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
1442: OUT_BYTE(rq->nr_sectors,io_base+IDE_NSECTOR_OFFSET);
1443: #ifdef CONFIG_BLK_DEV_PROMISE
1444: if (IS_PROMISE_DRIVE) {
1445: if (hwif->is_promise2 || rq->cmd == READ) {
1446: use_promise_io = 1;
1447: }
1448: }
1449: if (drive->select.b.lba || use_promise_io) {
1450: #else /* !CONFIG_BLK_DEV_PROMISE */
1451: if (drive->select.b.lba) {
1452: #endif /* CONFIG_BLK_DEV_PROMISE */
1453: #ifdef DEBUG
1454: printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
1455: drive->name, (rq->cmd==READ)?"read":"writ",
1456: block, rq->nr_sectors, (unsigned long) rq->buffer);
1457: #endif
1458: OUT_BYTE(block,io_base+IDE_SECTOR_OFFSET);
1459: OUT_BYTE(block>>=8,io_base+IDE_LCYL_OFFSET);
1460: OUT_BYTE(block>>=8,io_base+IDE_HCYL_OFFSET);
1461: OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base+IDE_SELECT_OFFSET);
1462: } else {
1463: unsigned int sect,head,cyl,track;
1464: track = block / drive->sect;
1465: sect = block % drive->sect + 1;
1466: OUT_BYTE(sect,io_base+IDE_SECTOR_OFFSET);
1467: head = track % drive->head;
1468: cyl = track / drive->head;
1469: OUT_BYTE(cyl,io_base+IDE_LCYL_OFFSET);
1470: OUT_BYTE(cyl>>8,io_base+IDE_HCYL_OFFSET);
1471: OUT_BYTE(head|drive->select.all,io_base+IDE_SELECT_OFFSET);
1472: #ifdef DEBUG
1473: printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
1474: drive->name, (rq->cmd==READ)?"read":"writ", cyl,
1475: head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
1476: #endif
1477: }
1478: #ifdef CONFIG_BLK_DEV_PROMISE
1479: if (use_promise_io) {
1480: do_promise_io (drive, rq);
1481: return;
1482: }
1483: #endif /* CONFIG_BLK_DEV_PROMISE */
1484: if (rq->cmd == READ) {
1485: #ifdef CONFIG_BLK_DEV_TRITON
1486: if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
1487: return;
1488: #endif /* CONFIG_BLK_DEV_TRITON */
1489: ide_set_handler(drive, &read_intr, WAIT_CMD);
1490: OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base+IDE_COMMAND_OFFSET);
1491: return;
1492: }
1493: if (rq->cmd == WRITE) {
1494: #ifdef CONFIG_BLK_DEV_TRITON
1495: if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
1496: return;
1497: #endif /* CONFIG_BLK_DEV_TRITON */
1498: OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base+IDE_COMMAND_OFFSET);
1499: if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
1500: printk("%s: no DRQ after issuing %s\n", drive->name,
1501: drive->mult_count ? "MULTWRITE" : "WRITE");
1502: return;
1503: }
1504: if (!drive->unmask)
1505: cli();
1506: if (drive->mult_count) {
1507: HWGROUP(drive)->wrq = *rq; /* scratchpad */
1508: ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
1509: ide_multwrite(drive, drive->mult_count);
1510: } else {
1511: ide_set_handler (drive, &write_intr, WAIT_CMD);
1512: ide_output_data(drive, rq->buffer, SECTOR_WORDS);
1513: }
1514: return;
1515: }
1516: printk("%s: bad command: %d\n", drive->name, rq->cmd);
1517: ide_end_request(0, HWGROUP(drive));
1518: }
1519:
1520: /*
1521: * execute_drive_cmd() issues a special drive command,
1522: * usually initiated by ioctl() from the external hdparm program.
1523: */
1524: static void execute_drive_cmd (ide_drive_t *drive, struct request *rq)
1525: {
1526: byte *args = rq->buffer;
1527: if (args) {
1528: #ifdef DEBUG
1529: printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x xx=0x%02x\n",
1530: drive->name, args[0], args[1], args[2], args[3]);
1531: #endif
1532: OUT_BYTE(args[2],IDE_FEATURE_REG);
1533: ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
1534: return;
1535: } else {
1536: /*
1537: * NULL is actually a valid way of waiting for
1538: * all current requests to be flushed from the queue.
1539: */
1540: #ifdef DEBUG
1541: printk("%s: DRIVE_CMD (null)\n", drive->name);
1542: #endif
1543: ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
1544: return;
1545: }
1546: }
1547:
1548: /*
1549: * do_request() initiates handling of a new I/O request
1550: */
1551: static inline void do_request (ide_hwif_t *hwif, struct request *rq)
1552: {
1553: unsigned int minor, unit;
1554: unsigned long block, blockend;
1555: ide_drive_t *drive;
1556:
1557: sti();
1558: #ifdef DEBUG
1559: printk("%s: do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
1560: #endif
1561: minor = MINOR(rq->rq_dev);
1562: unit = minor >> PARTN_BITS;
1563: if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
1564: printk("%s: bad device number: %s\n",
1565: hwif->name, kdevname(rq->rq_dev));
1566: goto kill_rq;
1567: }
1568: drive = &hwif->drives[unit];
1569: #ifdef DEBUG
1570: if (rq->bh && !buffer_locked(rq->bh)) {
1571: printk("%s: block not locked\n", drive->name);
1572: goto kill_rq;
1573: }
1574: #endif
1575: block = rq->sector;
1576: blockend = block + rq->nr_sectors;
1577: if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
1578: #ifdef MACH
1.1.1.2 ! root 1579: printk ("%s%c: bad access: block=%ld, count=%ld, blockend=%ld, nr_sects%ld\n",
1.1 root 1580: drive->name, (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ',
1581: block, rq->nr_sectors, blockend, drive->part[minor&PARTN_MASK].nr_sects);
1582: #else
1583: printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
1584: (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
1585: #endif
1586: goto kill_rq;
1587: }
1588: block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
1589: #if FAKE_FDISK_FOR_EZDRIVE
1590: if (block == 0 && drive->remap_0_to_1)
1591: block = 1; /* redirect MBR access to EZ-Drive partn table */
1592: #endif /* FAKE_FDISK_FOR_EZDRIVE */
1593: ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
1594: #if (DISK_RECOVERY_TIME > 0)
1595: while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
1596: #endif
1597:
1598: #ifdef CONFIG_BLK_DEV_IDETAPE
1599: POLL_HWIF_TAPE_DRIVE; /* macro from ide-tape.h */
1600: #endif /* CONFIG_BLK_DEV_IDETAPE */
1601:
1602: SELECT_DRIVE(hwif,drive);
1603: if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1604: printk("%s: drive not ready for command\n", drive->name);
1605: return;
1606: }
1.1.1.2 ! root 1607:
1.1 root 1608: if (!drive->special.all) {
1609: if (rq->cmd == IDE_DRIVE_CMD) {
1610: execute_drive_cmd(drive, rq);
1611: return;
1612: }
1613: #ifdef CONFIG_BLK_DEV_IDEATAPI
1614: switch (drive->media) {
1615: case ide_disk:
1616: do_rw_disk (drive, rq, block);
1617: return;
1618: #ifdef CONFIG_BLK_DEV_IDECD
1619: case ide_cdrom:
1620: ide_do_rw_cdrom (drive, block);
1621: return;
1622: #endif /* CONFIG_BLK_DEV_IDECD */
1623: #ifdef CONFIG_BLK_DEV_IDETAPE
1624: case ide_tape:
1625: idetape_do_request (drive, rq, block);
1626: return;
1627: #endif /* CONFIG_BLK_DEV_IDETAPE */
1628: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
1629: case ide_floppy:
1630: idefloppy_do_request (drive, rq, block);
1631: return;
1632: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
1633: #ifdef CONFIG_BLK_DEV_IDESCSI
1634: case ide_scsi:
1635: idescsi_do_request (drive, rq, block);
1636: return;
1637: #endif /* CONFIG_BLK_DEV_IDESCSI */
1638:
1639: default:
1640: printk("%s: media type %d not supported\n",
1641: drive->name, drive->media);
1642: goto kill_rq;
1643: }
1644: #else
1645: do_rw_disk (drive, rq, block); /* simpler and faster */
1646: return;
1.1.1.2 ! root 1647: #endif /* CONFIG_BLK_DEV_IDEATAPI */
1.1 root 1648: }
1649: do_special(drive);
1650: return;
1651: kill_rq:
1652: ide_end_request(0, hwif->hwgroup);
1653: }
1654:
1655: /*
1656: * The driver enables interrupts as much as possible. In order to do this,
1657: * (a) the device-interrupt is always masked before entry, and
1658: * (b) the timeout-interrupt is always disabled before entry.
1659: *
1660: * If we enter here from, say irq14, and then start a new request for irq15,
1661: * (possible with "serialize" option) then we cannot ensure that we exit
1662: * before the irq15 hits us. So, we must be careful not to let this bother us.
1663: *
1664: * Interrupts are still masked (by default) whenever we are exchanging
1665: * data/cmds with a drive, because some drives seem to have very poor
1666: * tolerance for latency during I/O. For devices which don't suffer from
1667: * this problem (most don't), the unmask flag can be set using the "hdparm"
1668: * utility, to permit other interrupts during data/cmd transfers.
1669: */
1670: void ide_do_request (ide_hwgroup_t *hwgroup)
1671: {
1672: cli(); /* paranoia */
1673: if (hwgroup->handler != NULL) {
1674: printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
1675: return;
1676: }
1677: do {
1678: ide_hwif_t *hwif = hwgroup->hwif;
1679: struct request *rq;
1680: if ((rq = hwgroup->rq) == NULL) {
1681: if (hwif->sharing_irq && hwgroup->drive) /* set nIEN */
1682: OUT_BYTE(hwgroup->drive->ctl|2,hwif->ctl_port);
1683: /*
1684: * hwgroup->next_hwif is different from hwgroup->hwif
1685: * only when a request is inserted using "ide_next".
1686: * This saves wear and tear on IDE tapes.
1687: */
1688: hwif = hwgroup->next_hwif;
1689: do {
1690: rq = blk_dev[hwif->major].current_request;
1691: if (rq != NULL && rq->rq_status != RQ_INACTIVE)
1692: goto got_rq;
1693: } while ((hwif = hwif->next) != hwgroup->next_hwif);
1694: hwgroup->active = 0;
1695: return; /* no work left for this hwgroup */
1696: }
1.1.1.2 ! root 1697: got_rq:
1.1 root 1698: do_request(hwgroup->hwif = hwgroup->next_hwif = hwif, hwgroup->rq = rq);
1699: cli();
1700: } while (hwgroup->handler == NULL);
1701: }
1702:
1703: /*
1704: * do_hwgroup_request() invokes ide_do_request() after first masking
1705: * all possible interrupts for the current hwgroup. This prevents race
1706: * conditions in the event that an unexpected interrupt occurs while
1707: * we are in the driver.
1708: *
1709: * Note that when an interrupt is used to reenter the driver, the first level
1710: * handler will already have masked the irq that triggered, but any other ones
1711: * for the hwgroup will still be unmasked. The driver tries to be careful
1712: * about such things.
1713: */
1714: static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
1715: {
1716: if (hwgroup->handler == NULL) {
1717: ide_hwif_t *hgif = hwgroup->hwif;
1718: ide_hwif_t *hwif = hgif;
1719: hwgroup->active = 1;
1720: do {
1721: disable_irq(hwif->irq);
1722: } while ((hwif = hwif->next) != hgif);
1723: ide_do_request (hwgroup);
1724: do {
1725: enable_irq(hwif->irq);
1726: } while ((hwif = hwif->next) != hgif);
1727: }
1728: }
1729:
1730: static void do_ide0_request (void) /* invoked with cli() */
1731: {
1732: do_hwgroup_request (ide_hwifs[0].hwgroup);
1733: }
1734:
1735: #if MAX_HWIFS > 1
1736: static void do_ide1_request (void) /* invoked with cli() */
1737: {
1738: do_hwgroup_request (ide_hwifs[1].hwgroup);
1739: }
1740: #endif
1741:
1742: #if MAX_HWIFS > 2
1743: static void do_ide2_request (void) /* invoked with cli() */
1744: {
1745: do_hwgroup_request (ide_hwifs[2].hwgroup);
1746: }
1747: #endif
1748:
1749: #if MAX_HWIFS > 3
1750: static void do_ide3_request (void) /* invoked with cli() */
1751: {
1752: do_hwgroup_request (ide_hwifs[3].hwgroup);
1753: }
1754: #endif
1755:
1756: static void timer_expiry (unsigned long data)
1757: {
1758: ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1759: ide_drive_t *drive = hwgroup->drive;
1760: unsigned long flags;
1761:
1762: save_flags(flags);
1763: cli();
1764:
1765: if (hwgroup->poll_timeout != 0) { /* polling in progress? */
1766: ide_handler_t *handler = hwgroup->handler;
1767: hwgroup->handler = NULL;
1768: handler(drive);
1769: } else if (hwgroup->handler == NULL) { /* not waiting for anything? */
1770: sti(); /* drive must have responded just as the timer expired */
1771: printk("%s: marginal timeout\n", drive->name);
1772: } else {
1773: hwgroup->handler = NULL; /* abort the operation */
1774: if (hwgroup->hwif->dmaproc)
1775: (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
1776: ide_error(drive, "irq timeout", GET_STAT());
1777: }
1778: if (hwgroup->handler == NULL)
1779: do_hwgroup_request (hwgroup);
1780: restore_flags(flags);
1781: }
1782:
1783: /*
1784: * There's nothing really useful we can do with an unexpected interrupt,
1785: * other than reading the status register (to clear it), and logging it.
1786: * There should be no way that an irq can happen before we're ready for it,
1787: * so we needn't worry much about losing an "important" interrupt here.
1788: *
1789: * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
1790: * drive enters "idle", "standby", or "sleep" mode, so if the status looks
1791: * "good", we just ignore the interrupt completely.
1792: *
1793: * This routine assumes cli() is in effect when called.
1794: *
1795: * If an unexpected interrupt happens on irq15 while we are handling irq14
1796: * and if the two interfaces are "serialized" (CMD640), then it looks like
1797: * we could screw up by interfering with a new request being set up for irq15.
1798: *
1799: * In reality, this is a non-issue. The new command is not sent unless the
1800: * drive is ready to accept one, in which case we know the drive is not
1801: * trying to interrupt us. And ide_set_handler() is always invoked before
1802: * completing the issuance of any new drive command, so we will not be
1803: * accidently invoked as a result of any valid command completion interrupt.
1804: *
1805: */
1806: static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
1807: {
1808: byte stat;
1809: unsigned int unit;
1810: ide_hwif_t *hwif = hwgroup->hwif;
1811:
1812: /*
1813: * handle the unexpected interrupt
1814: */
1815: do {
1816: if (hwif->irq == irq) {
1817: for (unit = 0; unit < MAX_DRIVES; ++unit) {
1818: ide_drive_t *drive = &hwif->drives[unit];
1819: if (!drive->present)
1820: continue;
1821: SELECT_DRIVE(hwif,drive);
1822: udelay(100); /* Ugly, but wait_stat() may not be safe here */
1823: if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT)) {
1824: /* Try to not flood the console with msgs */
1825: static unsigned long last_msgtime = 0;
1826: if ((last_msgtime + (HZ/2)) < jiffies) {
1827: last_msgtime = jiffies;
1828: (void) ide_dump_status(drive, "unexpected_intr", stat);
1829: }
1830: }
1831: if ((stat & DRQ_STAT))
1832: try_to_flush_leftover_data(drive);
1833: }
1834: }
1835: } while ((hwif = hwif->next) != hwgroup->hwif);
1836: SELECT_DRIVE(hwif,hwgroup->drive); /* Ugh.. probably interrupts current I/O */
1837: udelay(100); /* Ugly, but wait_stat() may not be safe here */
1838: }
1839:
1840: /*
1841: * entry point for all interrupts, caller does cli() for us
1842: */
1843: void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
1844: {
1845: ide_hwgroup_t *hwgroup = dev_id;
1846: ide_handler_t *handler;
1847:
1848: if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
1849: ide_drive_t *drive = hwgroup->drive;
1850: hwgroup->handler = NULL;
1851: del_timer(&(hwgroup->timer));
1852: if (drive->unmask)
1853: sti();
1854: handler(drive);
1855: cli(); /* this is necessary, as next rq may be different irq */
1856: if (hwgroup->handler == NULL) {
1857: SET_RECOVERY_TIMER(HWIF(drive));
1858: ide_do_request(hwgroup);
1859: }
1860: } else {
1861: unexpected_intr(irq, hwgroup);
1862: }
1863: cli();
1864: }
1865:
1866: /*
1867: * get_info_ptr() returns the (ide_drive_t *) for a given device number.
1868: * It returns NULL if the given device number does not match any present drives.
1869: */
1870: static ide_drive_t *get_info_ptr (kdev_t i_rdev)
1871: {
1872: int major = MAJOR(i_rdev);
1873: unsigned int h;
1874:
1875: for (h = 0; h < MAX_HWIFS; ++h) {
1876: ide_hwif_t *hwif = &ide_hwifs[h];
1877: if (hwif->present && major == hwif->major) {
1878: unsigned unit = DEVICE_NR(i_rdev);
1879: if (unit < MAX_DRIVES) {
1880: ide_drive_t *drive = &hwif->drives[unit];
1881: if (drive->present)
1882: return drive;
1883: } else if (major == IDE0_MAJOR && unit < 4) {
1884: printk("ide: probable bad entry for /dev/hd%c\n", 'a'+unit);
1885: printk("ide: to fix it, run: /usr/src/linux/scripts/MAKEDEV.ide\n");
1886: }
1887: break;
1888: }
1889: }
1890: return NULL;
1891: }
1892:
1893: /*
1894: * This function is intended to be used prior to invoking ide_do_drive_cmd().
1895: */
1896: void ide_init_drive_cmd (struct request *rq)
1897: {
1898: rq->buffer = NULL;
1899: rq->cmd = IDE_DRIVE_CMD;
1900: rq->sector = 0;
1901: rq->nr_sectors = 0;
1902: rq->current_nr_sectors = 0;
1903: rq->sem = NULL;
1904: rq->bh = NULL;
1905: rq->bhtail = NULL;
1906: rq->next = NULL;
1907:
1908: #if 0 /* these are done each time through ide_do_drive_cmd() */
1909: rq->errors = 0;
1910: rq->rq_status = RQ_ACTIVE;
1911: rq->rq_dev = ????;
1912: #endif
1913: }
1914:
1915: /*
1916: * This function issues a special IDE device request
1917: * onto the request queue.
1918: *
1919: * If action is ide_wait, then the rq is queued at the end of the
1920: * request queue, and the function sleeps until it has been processed.
1921: * This is for use when invoked from an ioctl handler.
1922: *
1923: * If action is ide_preempt, then the rq is queued at the head of
1924: * the request queue, displacing the currently-being-processed
1925: * request and this function returns immediately without waiting
1926: * for the new rq to be completed. This is VERY DANGEROUS, and is
1927: * intended for careful use by the ATAPI tape/cdrom driver code.
1928: *
1929: * If action is ide_next, then the rq is queued immediately after
1930: * the currently-being-processed-request (if any), and the function
1931: * returns without waiting for the new rq to be completed. As above,
1932: * This is VERY DANGEROUS, and is intended for careful use by the
1933: * ATAPI tape/cdrom driver code.
1934: *
1935: * If action is ide_end, then the rq is queued at the end of the
1936: * request queue, and the function returns immediately without waiting
1937: * for the new rq to be completed. This is again intended for careful
1938: * use by the ATAPI tape/cdrom driver code. (Currently used by ide-tape.c,
1939: * when operating in the pipelined operation mode).
1940: */
1941: int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
1942: {
1943: unsigned long flags;
1944: unsigned int major = HWIF(drive)->major;
1945: struct request *cur_rq;
1946: struct blk_dev_struct *bdev = &blk_dev[major];
1947: struct semaphore sem = MUTEX_LOCKED;
1948:
1949: if (IS_PROMISE_DRIVE && rq->buffer != NULL)
1950: return -ENOSYS; /* special drive cmds not supported */
1951: rq->errors = 0;
1952: rq->rq_status = RQ_ACTIVE;
1953: rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
1954: if (action == ide_wait)
1955: rq->sem = &sem;
1956: unplug_device(bdev);
1957:
1958: save_flags(flags);
1959: cli();
1960: if (action == ide_next)
1961: HWGROUP(drive)->next_hwif = HWIF(drive);
1962: cur_rq = bdev->current_request;
1963:
1964: if (cur_rq == NULL || action == ide_preempt) {
1965: rq->next = cur_rq;
1966: bdev->current_request = rq;
1967: if (action == ide_preempt)
1968: HWGROUP(drive)->rq = NULL;
1969: } else {
1970: if (action == ide_wait || action == ide_end) {
1971: while (cur_rq->next != NULL) /* find end of list */
1972: cur_rq = cur_rq->next;
1973: }
1974: rq->next = cur_rq->next;
1975: cur_rq->next = rq;
1976: }
1977: if (!HWGROUP(drive)->active) {
1978: do_hwgroup_request(HWGROUP(drive));
1979: cli();
1980: }
1981: if (action == ide_wait && rq->rq_status != RQ_INACTIVE)
1982: down(&sem); /* wait for it to be serviced */
1983: restore_flags(flags);
1984: return rq->errors ? -EIO : 0; /* return -EIO if errors */
1985: }
1986:
1987: static int ide_open(struct inode * inode, struct file * filp)
1988: {
1989: ide_drive_t *drive;
1990: unsigned long flags;
1991:
1992: if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
1993: return -ENXIO;
1994: save_flags(flags);
1995: cli();
1996: while (drive->busy)
1997: sleep_on(&drive->wqueue);
1998: drive->usage++;
1999: restore_flags(flags);
2000: #ifdef CONFIG_BLK_DEV_IDECD
2001: if (drive->media == ide_cdrom)
2002: return ide_cdrom_open (inode, filp, drive);
2003: #endif /* CONFIG_BLK_DEV_IDECD */
2004: #ifdef CONFIG_BLK_DEV_IDETAPE
2005: if (drive->media == ide_tape)
2006: return idetape_blkdev_open (inode, filp, drive);
2007: #endif /* CONFIG_BLK_DEV_IDETAPE */
2008: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
2009: if (drive->media == ide_floppy)
2010: return idefloppy_open (inode, filp, drive);
2011: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
2012: #ifdef CONFIG_BLK_DEV_IDESCSI
2013: if (drive->media == ide_scsi)
2014: return idescsi_open (inode, filp, drive);
2015: #endif /* CONFIG_BLK_DEV_IDESCSI */
2016: if (drive->removable && drive->usage == 1) {
2017: byte door_lock[] = {WIN_DOORLOCK,0,0,0};
2018: struct request rq;
2019: check_disk_change(inode->i_rdev);
2020: ide_init_drive_cmd (&rq);
2021: rq.buffer = door_lock;
2022: /*
2023: * Ignore the return code from door_lock,
2024: * since the open() has already succeeded,
2025: * and the door_lock is irrelevant at this point.
2026: */
2027: (void) ide_do_drive_cmd(drive, &rq, ide_wait);
2028: }
2029: return 0;
2030: }
2031:
2032: /*
2033: * Releasing a block device means we sync() it, so that it can safely
2034: * be forgotten about...
2035: */
2036: static void ide_release(struct inode * inode, struct file * file)
2037: {
2038: ide_drive_t *drive;
2039:
2040: if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
2041: fsync_dev(inode->i_rdev);
2042: drive->usage--;
2043: #ifdef CONFIG_BLK_DEV_IDECD
2044: if (drive->media == ide_cdrom) {
2045: ide_cdrom_release (inode, file, drive);
2046: return;
2047: }
2048: #endif /* CONFIG_BLK_DEV_IDECD */
2049: #ifdef CONFIG_BLK_DEV_IDETAPE
2050: if (drive->media == ide_tape) {
2051: idetape_blkdev_release (inode, file, drive);
2052: return;
2053: }
2054: #endif /* CONFIG_BLK_DEV_IDETAPE */
2055: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
2056: if (drive->media == ide_floppy) {
2057: idefloppy_release (inode, file, drive);
2058: return;
2059: }
2060: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
2061: #ifdef CONFIG_BLK_DEV_IDESCSI
2062: if (drive->media == ide_scsi) {
2063: idescsi_ide_release (inode, file, drive);
2064: return;
2065: }
2066: #endif /* CONFIG_BLK_DEV_IDESCSI */
2067: if (drive->removable && !drive->usage) {
2068: byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
2069: struct request rq;
2070: invalidate_buffers(inode->i_rdev);
2071: ide_init_drive_cmd (&rq);
2072: rq.buffer = door_unlock;
2073: (void) ide_do_drive_cmd(drive, &rq, ide_wait);
2074: }
2075: }
2076: }
2077:
2078: /*
2079: * This routine is called to flush all partitions and partition tables
2080: * for a changed disk, and then re-read the new partition table.
2081: * If we are revalidating a disk because of a media change, then we
2082: * enter with usage == 0. If we are using an ioctl, we automatically have
2083: * usage == 1 (we need an open channel to use an ioctl :-), so this
2084: * is our limit.
2085: */
2086: static int revalidate_disk(kdev_t i_rdev)
2087: {
2088: ide_drive_t *drive;
2089: unsigned int p, major, minor;
2090: long flags;
2091:
2092: if ((drive = get_info_ptr(i_rdev)) == NULL)
2093: return -ENODEV;
2094:
2095: major = MAJOR(i_rdev);
2096: minor = drive->select.b.unit << PARTN_BITS;
2097: save_flags(flags);
2098: cli();
2099: if (drive->busy || (drive->usage > 1)) {
2100: restore_flags(flags);
2101: return -EBUSY;
2102: };
2103: drive->busy = 1;
2104: restore_flags(flags);
2105:
2106: for (p = 0; p < (1<<PARTN_BITS); ++p) {
2107: if (drive->part[p].nr_sects > 0) {
2108: kdev_t devp = MKDEV(major, minor+p);
2109: fsync_dev (devp);
2110: invalidate_inodes (devp);
2111: invalidate_buffers (devp);
2112: set_blocksize(devp, 1024);
2113: }
2114: drive->part[p].start_sect = 0;
2115: drive->part[p].nr_sects = 0;
2116: };
2117:
2118: drive->part[0].nr_sects = current_capacity(drive);
2119: if ((drive->media != ide_disk && drive->media != ide_floppy) || !drive->part[0].nr_sects)
2120: drive->part[0].start_sect = -1;
2121: resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
2122:
2123: drive->busy = 0;
2124: wake_up(&drive->wqueue);
2125: return 0;
2126: }
2127:
2128: static int write_fs_long (unsigned long useraddr, long value)
2129: {
2130: int err;
2131:
2132: if (NULL == (long *)useraddr)
2133: return -EINVAL;
2134: if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
2135: return err;
2136: put_user((unsigned)value, (long *) useraddr);
2137: return 0;
2138: }
2139:
2140: static int ide_ioctl (struct inode *inode, struct file *file,
2141: unsigned int cmd, unsigned long arg)
2142: {
2143: int err;
2144: ide_drive_t *drive;
2145: unsigned long flags;
2146: struct request rq;
2147:
2148: if (!inode || !(inode->i_rdev))
2149: return -EINVAL;
2150: if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
2151: return -ENODEV;
2152: ide_init_drive_cmd (&rq);
2153: switch (cmd) {
2154: case HDIO_GETGEO:
2155: {
2156: struct hd_geometry *loc = (struct hd_geometry *) arg;
2157: if (!loc || (drive->media != ide_disk && drive->media != ide_floppy)) return -EINVAL;
2158: #ifdef MACH
2159: loc->heads = drive->bios_head;
2160: loc->sectors = drive->bios_sect;
2161: loc->cylinders = drive->bios_cyl;
2162: loc->start
2163: = (drive->part[MINOR(inode->i_rdev)&PARTN_MASK]
2164: .start_sect);
2165: #else
2166: err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
2167: if (err) return err;
2168: put_user(drive->bios_head, (byte *) &loc->heads);
2169: put_user(drive->bios_sect, (byte *) &loc->sectors);
2170: put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
2171: put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
2172: (unsigned long *) &loc->start);
2173: #endif
2174: return 0;
2175: }
2176: case BLKFLSBUF:
2177: if (!suser()) return -EACCES;
2178: fsync_dev(inode->i_rdev);
2179: invalidate_buffers(inode->i_rdev);
2180: return 0;
2181:
2182: case BLKRASET:
2183: if (!suser()) return -EACCES;
2184: if(arg > 0xff) return -EINVAL;
2185: read_ahead[MAJOR(inode->i_rdev)] = arg;
2186: return 0;
2187:
2188: case BLKRAGET:
2189: return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
2190:
2191: case BLKGETSIZE: /* Return device size */
2192: return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
2193: case BLKRRPART: /* Re-read partition tables */
2194: if (!suser()) return -EACCES;
2195: return revalidate_disk(inode->i_rdev);
2196:
2197: case HDIO_GET_KEEPSETTINGS:
2198: return write_fs_long(arg, drive->keep_settings);
2199:
2200: case HDIO_GET_UNMASKINTR:
2201: return write_fs_long(arg, drive->unmask);
2202:
2203: case HDIO_GET_DMA:
2204: return write_fs_long(arg, drive->using_dma);
2205:
2206: case HDIO_GET_32BIT:
2207: return write_fs_long(arg, drive->io_32bit);
2208:
2209: case HDIO_GET_MULTCOUNT:
2210: return write_fs_long(arg, drive->mult_count);
2211:
2212: case HDIO_GET_IDENTITY:
2213: if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
2214: return -EINVAL;
2215: if (drive->id == NULL)
2216: return -ENOMSG;
2217: err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
2218: if (!err)
2219: memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
2220: return err;
2221:
2222: case HDIO_GET_NOWERR:
2223: return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
2224:
2225: case HDIO_SET_DMA:
2226: if (!suser()) return -EACCES;
2227: #ifdef CONFIG_BLK_DEV_IDECD
2228: if (drive->media == ide_cdrom)
2229: return -EPERM;
2230: #endif /* CONFIG_BLK_DEV_IDECD */
2231: if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
2232: return -EPERM;
2233: case HDIO_SET_KEEPSETTINGS:
2234: case HDIO_SET_UNMASKINTR:
2235: case HDIO_SET_NOWERR:
2236: if (arg > 1)
2237: return -EINVAL;
2238: case HDIO_SET_32BIT:
2239: if (!suser()) return -EACCES;
2240: if ((MINOR(inode->i_rdev) & PARTN_MASK))
2241: return -EINVAL;
2242: save_flags(flags);
2243: cli();
2244: switch (cmd) {
2245: case HDIO_SET_DMA:
2246: if (!(HWIF(drive)->dmaproc)) {
2247: restore_flags(flags);
2248: return -EPERM;
2249: }
2250: drive->using_dma = arg;
2251: break;
2252: case HDIO_SET_KEEPSETTINGS:
2253: drive->keep_settings = arg;
2254: break;
2255: case HDIO_SET_UNMASKINTR:
2256: if (arg && drive->no_unmask) {
2257: restore_flags(flags);
2258: return -EPERM;
2259: }
2260: drive->unmask = arg;
2261: break;
2262: case HDIO_SET_NOWERR:
2263: drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
2264: break;
2265: case HDIO_SET_32BIT:
2266: if (arg > (1 + (SUPPORT_VLB_SYNC<<1))) {
2267: restore_flags(flags);
2268: return -EINVAL;
2269: }
2270: if (arg && drive->no_io_32bit) {
2271: restore_flags(flags);
2272: return -EPERM;
2273: }
2274: drive->io_32bit = arg;
2275: #ifdef CONFIG_BLK_DEV_DTC2278
2276: if (HWIF(drive)->chipset == ide_dtc2278)
2277: HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
2278: #endif /* CONFIG_BLK_DEV_DTC2278 */
2279: break;
2280: }
2281: restore_flags(flags);
2282: return 0;
2283:
2284: case HDIO_SET_MULTCOUNT:
2285: if (!suser()) return -EACCES;
2286: if (MINOR(inode->i_rdev) & PARTN_MASK)
2287: return -EINVAL;
2288: if (drive->id && arg > drive->id->max_multsect)
2289: return -EINVAL;
2290: save_flags(flags);
2291: cli();
2292: if (drive->special.b.set_multmode) {
2293: restore_flags(flags);
2294: return -EBUSY;
2295: }
2296: drive->mult_req = arg;
2297: drive->special.b.set_multmode = 1;
2298: restore_flags(flags);
2299: (void) ide_do_drive_cmd (drive, &rq, ide_wait);
2300: return (drive->mult_count == arg) ? 0 : -EIO;
2301:
2302: case HDIO_DRIVE_CMD:
2303: {
2304: byte args[4], *argbuf = args;
2305: int argsize = 4;
2306: if (!suser() || securelevel > 0) return -EACCES;
2307: if (NULL == (void *) arg) {
2308: err = ide_do_drive_cmd(drive, &rq, ide_wait);
2309: } else if (!(err = verify_area(VERIFY_READ,(void *)arg, 4))) {
2310: memcpy_fromfs(args, (void *)arg, 4);
2311: if (args[3]) {
2312: argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
2313: argbuf = kmalloc(argsize, GFP_KERNEL);
2314: if (argbuf == NULL)
2315: return -ENOMEM;
2316: argbuf[0] = args[0];
2317: argbuf[1] = args[1];
2318: argbuf[2] = args[2];
2319: argbuf[3] = args[3];
2320: }
2321: if (!(err = verify_area(VERIFY_WRITE,(void *)arg, argsize))) {
2322: rq.buffer = argbuf;
2323: err = ide_do_drive_cmd(drive, &rq, ide_wait);
2324: memcpy_tofs((void *)arg, argbuf, argsize);
2325: }
2326: if (argsize > 4)
2327: kfree(argbuf);
2328: }
2329: return err;
2330: }
2331: case HDIO_SET_PIO_MODE:
2332: if (!suser()) return -EACCES;
2333: if (MINOR(inode->i_rdev) & PARTN_MASK)
2334: return -EINVAL;
2335: if (!HWIF(drive)->tuneproc)
2336: return -ENOSYS;
2337: save_flags(flags);
2338: cli();
2339: if (drive->special.b.set_tune) {
2340: restore_flags(flags);
2341: return -EBUSY;
2342: }
2343: drive->tune_req = (byte) arg;
2344: drive->special.b.set_tune = 1;
2345: restore_flags(flags);
2346: (void) ide_do_drive_cmd (drive, &rq, ide_wait);
2347: return 0;
2348:
2349: RO_IOCTLS(inode->i_rdev, arg);
2350:
2351: default:
2352: #ifdef CONFIG_BLK_DEV_IDECD
2353: if (drive->media == ide_cdrom)
2354: return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
2355: #endif /* CONFIG_BLK_DEV_IDECD */
2356: #ifdef CONFIG_BLK_DEV_IDETAPE
2357: if (drive->media == ide_tape)
2358: return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
2359: #endif /* CONFIG_BLK_DEV_IDETAPE */
2360: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
2361: if (drive->media == ide_floppy)
2362: return idefloppy_ioctl(drive, inode, file, cmd, arg);
2363: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
2364: #ifdef CONFIG_BLK_DEV_IDESCSI
2365: if (drive->media == ide_scsi)
2366: return idescsi_ioctl(drive, inode, file, cmd, arg);
2367: #endif /* CONFIG_BLK_DEV_IDESCSI */
2368: return -EPERM;
2369: }
2370: }
2371:
2372: static int ide_check_media_change (kdev_t i_rdev)
2373: {
2374: ide_drive_t *drive;
2375:
2376: if ((drive = get_info_ptr(i_rdev)) == NULL)
2377: return -ENODEV;
2378: #ifdef CONFIG_BLK_DEV_IDECD
2379: if (drive->media == ide_cdrom)
2380: return ide_cdrom_check_media_change (drive);
2381: #endif /* CONFIG_BLK_DEV_IDECD */
2382: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
2383: if (drive->media == ide_floppy)
2384: return idefloppy_media_change (drive);
2385: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
2386: if (drive->removable) /* for disks */
2387: return 1; /* always assume it was changed */
2388: return 0;
2389: }
2390:
2391: void ide_fixstring (byte *s, const int bytecount, const int byteswap)
2392: {
2393: byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
2394:
2395: if (byteswap) {
2396: /* convert from big-endian to host byte order */
2397: for (p = end ; p != s;) {
2398: unsigned short *pp = (unsigned short *) (p -= 2);
2399: *pp = ntohs(*pp);
2400: }
2401: }
2402:
2403: /* strip leading blanks */
2404: while (s != end && *s == ' ')
2405: ++s;
2406:
2407: /* compress internal blanks and strip trailing blanks */
2408: while (s != end && *s) {
2409: if (*s++ != ' ' || (s != end && *s && *s != ' '))
2410: *p++ = *(s-1);
2411: }
2412:
2413: /* wipe out trailing garbage */
2414: while (p != end)
2415: *p++ = '\0';
2416: }
2417:
2418: static inline void do_identify (ide_drive_t *drive, byte cmd)
2419: {
2420: int bswap;
2421: struct hd_driveid *id;
2422: unsigned long capacity, check;
2423:
2424: id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
2425: ide_input_data(drive, id, SECTOR_WORDS);/* read 512 bytes of id info */
2426: sti();
2427:
2428: #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
2429: /*
1.1.1.2 ! root 2430: * EATA SCSI controllers do a hardware ATA emulation:
1.1 root 2431: * Ignore them if there is a driver for them available.
2432: */
2433: if ((id->model[0] == 'P' && id->model[1] == 'M')
2434: || (id->model[0] == 'S' && id->model[1] == 'K')) {
2435: printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
2436: drive->present = 0;
2437: return;
2438: }
2439: #endif
2440:
2441: /*
2442: * WIN_IDENTIFY returns little-endian info,
2443: * WIN_PIDENTIFY *usually* returns little-endian info.
2444: */
2445: bswap = 1;
2446: if (cmd == WIN_PIDENTIFY) {
2447: if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
2448: || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
2449: || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
2450: bswap = 0; /* Vertos drives may still be weird */
2451: }
2452: ide_fixstring (id->model, sizeof(id->model), bswap);
2453: ide_fixstring (id->fw_rev, sizeof(id->fw_rev), bswap);
2454: ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
2455:
2456: if (strstr(id->model, "E X A B Y T E N E S T"))
2457: return;
2458:
2459: #ifdef CONFIG_BLK_DEV_IDEATAPI
2460: /*
2461: * Check for an ATAPI device
2462: */
2463: if (cmd == WIN_PIDENTIFY) {
2464: byte type = (id->config >> 8) & 0x1f;
2465: printk("%s: %s, ATAPI ", drive->name, id->model);
2466: #ifdef CONFIG_BLK_DEV_PROMISE
2467: if (HWIF(drive)->is_promise2) {
2468: printk(" -- not supported on 2nd Promise port\n");
2469: drive->present = 0;
2470: return;
2471: }
2472: #endif /* CONFIG_BLK_DEV_PROMISE */
2473: if (!drive->ide_scsi) switch (type) {
2474: case 0:
2475: if (!strstr(id->model, "oppy") && !strstr(id->model, "poyp") && !strstr(id->model, "ZIP"))
2476: printk("cdrom or floppy?, assuming ");
2477: if (drive->media != ide_cdrom && !strstr(id->model, "CD-ROM")) {
2478: #ifdef CONFIG_BLK_DEV_IDEFLOPPY
2479: printk("FLOPPY drive\n");
2480: drive->media = ide_floppy;
2481: if (idefloppy_identify_device(drive, id))
2482: drive->present = 1;
2483: return;
2484: #else
2485: printk("FLOPPY ");
2486: break;
2487: #endif /* CONFIG_BLK_DEV_IDEFLOPPY */
2488: }
2489: /* Early cdrom models used zero */
2490: case 5:
2491: #ifdef CONFIG_BLK_DEV_IDECD
2492: printk ("CDROM drive\n");
2493: drive->media = ide_cdrom;
2494: drive->present = 1;
2495: drive->removable = 1;
2496: return;
2497: #else
2498: printk ("CDROM ");
2499: break;
2500: #endif /* CONFIG_BLK_DEV_IDECD */
2501: case 1:
2502: #ifdef CONFIG_BLK_DEV_IDETAPE
2503: printk ("TAPE drive");
2504: if (idetape_identify_device (drive,id)) {
2505: drive->media = ide_tape;
2506: drive->present = 1;
2507: drive->removable = 1;
2508: if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
2509: if (!HWIF(drive)->dmaproc(ide_dma_check, drive))
2510: printk(", DMA");
2511: }
2512: printk("\n");
2513: }
2514: else {
2515: drive->present = 0;
2516: printk ("\nide-tape: the tape is not supported by this version of the driver\n");
2517: }
2518: return;
2519: #else
2520: printk ("TAPE ");
2521: break;
2522: #endif /* CONFIG_BLK_DEV_IDETAPE */
2523: default:
2524: drive->present = 0;
2525: printk("Type %d - Unknown device\n", type);
2526: return;
2527: }
2528: #ifdef CONFIG_BLK_DEV_IDESCSI
2529: printk("drive - enabling SCSI emulation\n");
2530: drive->media = ide_scsi;
2531: drive->present = 1;
2532: idescsi_setup(drive);
2533: #else
2534: drive->present = 0;
2535: printk("- not supported by this kernel\n");
2536: #endif /* CONFIG_BLK_DEV_IDESCSI */
2537: return;
2538: }
2539: #endif /* CONFIG_BLK_DEV_IDEATAPI */
2540:
2541: /* check for removable disks (eg. SYQUEST), ignore 'WD' drives */
2542: if (id->config & (1<<7)) { /* removable disk ? */
2543: if (id->model[0] != 'W' || id->model[1] != 'D')
2544: drive->removable = 1;
2545: }
2546:
2547: /* SunDisk drives: treat as non-removable, force one unit */
2548: if (id->model[0] == 'S' && id->model[1] == 'u') {
2549: drive->removable = 0;
2550: if (drive->select.all & (1<<4)) {
2551: drive->present = 0;
2552: return;
2553: }
2554: }
2555:
2556: drive->media = ide_disk;
2557: /* Extract geometry if we did not already have one for the drive */
2558: if (!drive->present) {
2559: drive->present = 1;
2560: drive->cyl = drive->bios_cyl = id->cyls;
2561: drive->head = drive->bios_head = id->heads;
2562: drive->sect = drive->bios_sect = id->sectors;
2563: }
2564: /* Handle logical geometry translation by the drive */
2565: if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
2566: && (id->cur_heads <= 16) && id->cur_sectors)
2567: {
2568: /*
2569: * Extract the physical drive geometry for our use.
2570: * Note that we purposely do *not* update the bios info.
2571: * This way, programs that use it (like fdisk) will
2572: * still have the same logical view as the BIOS does,
2573: * which keeps the partition table from being screwed.
2574: *
2575: * An exception to this is the cylinder count,
2576: * which we reexamine later on to correct for 1024 limitations.
2577: */
2578: drive->cyl = id->cur_cyls;
2579: drive->head = id->cur_heads;
2580: drive->sect = id->cur_sectors;
2581:
2582: /* check for word-swapped "capacity" field in id information */
2583: capacity = drive->cyl * drive->head * drive->sect;
2584: check = (id->cur_capacity0 << 16) | id->cur_capacity1;
2585: if (check == capacity) { /* was it swapped? */
2586: /* yes, bring it into little-endian order: */
2587: id->cur_capacity0 = (capacity >> 0) & 0xffff;
2588: id->cur_capacity1 = (capacity >> 16) & 0xffff;
2589: }
2590: }
2591: /* Use physical geometry if what we have still makes no sense */
2592: if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
2593: drive->cyl = id->cyls;
2594: drive->head = id->heads;
2595: drive->sect = id->sectors;
2596: }
2597:
2598: /* calculate drive capacity, and select LBA if possible */
1.1.1.2 ! root 2599: capacity = current_capacity (drive);
1.1 root 2600:
2601: /* Correct the number of cyls if the bios value is too small */
1.1.1.2 ! root 2602: if (!drive->forced_geom &&
! 2603: capacity > drive->bios_cyl * drive->bios_sect * drive->bios_head) {
! 2604: unsigned long cylsize;
! 2605: cylsize = drive->bios_sect * drive->bios_head;
! 2606: if (cylsize == 0 || capacity/cylsize > 65535) {
! 2607: drive->bios_sect = 63;
! 2608: drive->bios_head = 255;
! 2609: cylsize = 63*255;
! 2610: }
! 2611: if (capacity/cylsize > 65535)
! 2612: drive->bios_cyl = 65535;
! 2613: else
! 2614: drive->bios_cyl = capacity/cylsize;
! 2615: }
1.1 root 2616:
2617: if (!strncmp(id->model, "BMI ", 4) &&
2618: strstr(id->model, " ENHANCED IDE ") &&
2619: drive->select.b.lba)
2620: drive->no_geom = 1;
2621:
2622: printk ("%s: %.40s, %ldMB w/%dkB Cache, CHS=%d/%d/%d",
2623: drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
2624: drive->bios_cyl, drive->bios_head, drive->bios_sect);
2625:
2626: drive->mult_count = 0;
2627: if (id->max_multsect) {
2628: drive->mult_req = INITIAL_MULT_COUNT;
2629: if (drive->mult_req > id->max_multsect)
2630: drive->mult_req = id->max_multsect;
2631: if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
2632: drive->special.b.set_multmode = 1;
2633: }
2634: if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
2635: if (!(HWIF(drive)->dmaproc(ide_dma_check, drive))) {
2636: if ((id->field_valid & 4) && (id->dma_ultra & (id->dma_ultra >> 8) & 7))
2637: printk(", UDMA");
2638: else
2639: printk(", DMA");
2640: }
2641: }
2642: printk("\n");
2643: }
2644:
2645: /*
2646: * Delay for *at least* 50ms. As we don't know how much time is left
2647: * until the next tick occurs, we wait an extra tick to be safe.
2648: * This is used only during the probing/polling for drives at boot time.
2649: */
2650: static void delay_50ms (void)
2651: {
2652: unsigned long timer = jiffies + ((HZ + 19)/20) + 1;
2653: while (timer > jiffies);
2654: }
2655:
2656: /*
2657: * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
2658: * and waits for a response. It also monitors irqs while this is
2659: * happening, in hope of automatically determining which one is
2660: * being used by the interface.
2661: *
2662: * Returns: 0 device was identified
2663: * 1 device timed-out (no response to identify request)
2664: * 2 device aborted the command (refused to identify itself)
2665: */
2666: static int try_to_identify (ide_drive_t *drive, byte cmd)
2667: {
2668: int hd_status, rc;
2669: unsigned long timeout;
2670: unsigned long irqs_on = 0;
2671: int irq_off;
2672:
2673: if (!HWIF(drive)->irq) { /* already got an IRQ? */
2674: probe_irq_off(probe_irq_on()); /* clear dangling irqs */
2675: irqs_on = probe_irq_on(); /* start monitoring irqs */
2676: OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* enable device irq */
2677: }
2678:
2679: delay_50ms(); /* take a deep breath */
2680: if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
2681: printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
2682: hd_status = IDE_STATUS_REG; /* ancient Seagate drives */
2683: } else
2684: hd_status = IDE_ALTSTATUS_REG; /* use non-intrusive polling */
2685:
2686: #if CONFIG_BLK_DEV_PROMISE
2687: if (IS_PROMISE_DRIVE) {
2688: if (promise_cmd(drive,PROMISE_IDENTIFY)) {
2689: if (irqs_on)
2690: (void) probe_irq_off(irqs_on);
2691: return 1;
2692: }
2693: } else
2694: #endif /* CONFIG_BLK_DEV_PROMISE */
2695: OUT_BYTE(cmd,IDE_COMMAND_REG); /* ask drive for ID */
2696: timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
2697: timeout += jiffies;
2698: do {
2699: if (jiffies > timeout) {
2700: if (irqs_on)
2701: (void) probe_irq_off(irqs_on);
2702: return 1; /* drive timed-out */
2703: }
2704: delay_50ms(); /* give drive a breather */
2705: } while (IN_BYTE(hd_status) & BUSY_STAT);
2706:
2707: delay_50ms(); /* wait for IRQ and DRQ_STAT */
2708: if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
2709: unsigned long flags;
2710: save_flags(flags);
2711: cli(); /* some systems need this */
2712: do_identify(drive, cmd); /* drive returned ID */
2713: rc = 0; /* drive responded with ID */
2714: (void) GET_STAT(); /* clear drive IRQ */
2715: restore_flags(flags);
2716: } else
2717: rc = 2; /* drive refused ID */
2718: if (!HWIF(drive)->irq) {
2719: irq_off = probe_irq_off(irqs_on); /* get our irq number */
2720: if (irq_off > 0) {
2721: HWIF(drive)->irq = irq_off; /* save it for later */
2722: irqs_on = probe_irq_on();
2723: OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* mask device irq */
2724: udelay(5);
2725: (void) probe_irq_off(irqs_on);
2726: (void) probe_irq_off(probe_irq_on()); /* clear self-inflicted irq */
2727: (void) GET_STAT(); /* clear drive IRQ */
2728:
2729: } else { /* Mmmm.. multiple IRQs.. don't know which was ours */
2730: printk("%s: IRQ probe failed (%d)\n", drive->name, irq_off);
2731: #ifdef CONFIG_BLK_DEV_CMD640
2732: #ifdef CMD640_DUMP_REGS
2733: if (HWIF(drive)->chipset == ide_cmd640) {
2734: printk("%s: Hmmm.. probably a driver problem.\n", drive->name);
2735: CMD640_DUMP_REGS;
2736: }
2737: #endif /* CMD640_DUMP_REGS */
2738: #endif /* CONFIG_BLK_DEV_CMD640 */
2739: }
2740: }
2741: return rc;
2742: }
2743:
2744: /*
2745: * do_probe() has the difficult job of finding a drive if it exists,
2746: * without getting hung up if it doesn't exist, without trampling on
2747: * ethernet cards, and without leaving any IRQs dangling to haunt us later.
2748: *
2749: * If a drive is "known" to exist (from CMOS or kernel parameters),
2750: * but does not respond right away, the probe will "hang in there"
2751: * for the maximum wait time (about 30 seconds), otherwise it will
2752: * exit much more quickly.
2753: *
2754: * Returns: 0 device was identified
2755: * 1 device timed-out (no response to identify request)
2756: * 2 device aborted the command (refused to identify itself)
2757: * 3 bad status from device (possible for ATAPI drives)
2758: * 4 probe was not attempted because failure was obvious
2759: */
2760: static int do_probe (ide_drive_t *drive, byte cmd)
2761: {
2762: int rc;
2763: ide_hwif_t *hwif = HWIF(drive);
2764: unsigned long timeout;
2765: #ifdef CONFIG_BLK_DEV_IDEATAPI
2766: if (drive->present) { /* avoid waiting for inappropriate probes */
2767: if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
2768: return 4;
2769: }
2770: #endif /* CONFIG_BLK_DEV_IDEATAPI */
2771: #ifdef DEBUG
2772: printk("probing for %s: present=%d, media=%d, probetype=%s\n",
2773: drive->name, drive->present, drive->media,
2774: (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
2775: #endif
2776: SELECT_DRIVE(hwif,drive);
2777: delay_50ms();
2778: if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
2779: OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2780: delay_50ms(); /* allow BUSY_STAT to assert & clear */
2781: return 3; /* no i/f present: avoid killing ethernet cards */
2782: }
2783:
2784: if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
2785: || drive->present || cmd == WIN_PIDENTIFY)
2786: {
2787: if ((rc = try_to_identify(drive,cmd))) /* send cmd and wait */
2788: rc = try_to_identify(drive,cmd); /* failed: try again */
2789: if (rc == 1 && cmd == WIN_PIDENTIFY && drive->autotune != 2) {
2790: printk("%s: no response (status = 0x%02x), resetting drive\n", drive->name, GET_STAT());
2791: delay_50ms();
2792: OUT_BYTE (drive->select.all, IDE_SELECT_REG);
2793: delay_50ms();
2794: OUT_BYTE(WIN_SRST, IDE_COMMAND_REG);
2795: timeout = jiffies;
2796: while ((GET_STAT() & BUSY_STAT) && jiffies < timeout + WAIT_WORSTCASE)
2797: delay_50ms();
2798: rc = try_to_identify(drive, cmd);
2799: }
2800: if (rc == 1)
2801: printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
2802: (void) GET_STAT(); /* ensure drive irq is clear */
2803: } else {
2804: rc = 3; /* not present or maybe ATAPI */
2805: }
2806: if (drive->select.b.unit != 0) {
2807: OUT_BYTE(0xa0,IDE_SELECT_REG); /* exit with drive0 selected */
2808: delay_50ms();
2809: (void) GET_STAT(); /* ensure drive irq is clear */
2810: }
2811: return rc;
2812: }
2813:
2814: static void enable_nest (ide_drive_t *drive)
2815: {
2816: unsigned long timeout;
2817:
2818: printk("%s: enabling %s -- ", HWIF(drive)->name, drive->id->model);
2819: SELECT_DRIVE(HWIF(drive), drive);
2820: delay_50ms();
2821: OUT_BYTE(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
2822: timeout = jiffies + WAIT_WORSTCASE;
2823: do {
2824: if (jiffies > timeout) {
2825: printk("failed (timeout)\n");
2826: return;
2827: }
2828: delay_50ms();
2829: } while (GET_STAT() & BUSY_STAT);
2830: delay_50ms();
2831: if (!OK_STAT(GET_STAT(), 0, BAD_STAT))
2832: printk("failed (status = 0x%02x)\n", GET_STAT());
2833: else
2834: printk("success\n");
2835: if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2836: #ifdef CONFIG_BLK_DEV_IDEATAPI
2837: (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2838: #endif /* CONFIG_BLK_DEV_IDEATAPI */
2839: }
2840: }
2841:
2842: /*
2843: * probe_for_drive() tests for existence of a given drive using do_probe().
2844: *
2845: * Returns: 0 no device was found
2846: * 1 device was found (note: drive->present might still be 0)
2847: */
2848: static inline byte probe_for_drive (ide_drive_t *drive)
2849: {
2850: if (drive->noprobe) /* skip probing? */
2851: return drive->present;
2852: if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
2853: #ifdef CONFIG_BLK_DEV_IDEATAPI
2854: (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
2855: #endif /* CONFIG_BLK_DEV_IDEATAPI */
2856: }
2857: if (drive->id && strstr(drive->id->model, "E X A B Y T E N E S T"))
2858: enable_nest(drive);
2859: if (!drive->present)
2860: return 0; /* drive not found */
2861: if (drive->id == NULL) { /* identification failed? */
2862: if (drive->media == ide_disk) {
2863: printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
2864: drive->name, drive->cyl, drive->head, drive->sect);
2865: }
2866: #ifdef CONFIG_BLK_DEV_IDECD
2867: else if (drive->media == ide_cdrom) {
2868: printk("%s: ATAPI cdrom (?)\n", drive->name);
2869: }
2870: #endif /* CONFIG_BLK_DEV_IDECD */
2871: else {
2872: drive->present = 0; /* nuke it */
2873: }
2874: }
2875: return 1; /* drive was found */
2876: }
2877:
2878: /*
2879: * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
2880: * controller that is BIOS compatible with ST-506, and thus showing up in our
2881: * BIOS table, but not register compatible, and therefore not present in CMOS.
2882: *
2883: * Furthermore, we will assume that our ST-506 drives <if any> are the primary
2884: * drives in the system -- the ones reflected as drive 1 or 2. The first
2885: * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
2886: * nibble. This will be either a 4 bit drive type or 0xf indicating use byte
2887: * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS. A non-zero value
2888: * means we have an AT controller hard disk for that drive.
2889: *
2890: * Of course, there is no guarantee that either drive is actually on the
2891: * "primary" IDE interface, but we don't bother trying to sort that out here.
2892: * If a drive is not actually on the primary interface, then these parameters
2893: * will be ignored. This results in the user having to supply the logical
2894: * drive geometry as a boot parameter for each drive not on the primary i/f.
2895: *
2896: * The only "perfect" way to handle this would be to modify the setup.[cS] code
2897: * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
2898: * for us during initialization. I have the necessary docs -- any takers? -ml
2899: */
2900: static void probe_cmos_for_drives (ide_hwif_t *hwif)
2901: {
2902: #ifdef __i386__
2903: extern struct drive_info_struct drive_info;
2904: byte cmos_disks, *BIOS = (byte *) &drive_info;
2905: int unit;
2906:
2907: #ifdef CONFIG_BLK_DEV_PROMISE
2908: if (hwif->is_promise2)
2909: return;
2910: #endif /* CONFIG_BLK_DEV_PROMISE */
2911: outb_p(0x12,0x70); /* specify CMOS address 0x12 */
2912: cmos_disks = inb_p(0x71); /* read the data from 0x12 */
2913: /* Extract drive geometry from CMOS+BIOS if not already setup */
2914: for (unit = 0; unit < MAX_DRIVES; ++unit) {
2915: ide_drive_t *drive = &hwif->drives[unit];
2916: if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present && !drive->nobios) {
2917: drive->cyl = drive->bios_cyl = *(unsigned short *)BIOS;
2918: drive->head = drive->bios_head = *(BIOS+2);
2919: drive->sect = drive->bios_sect = *(BIOS+14);
2920: drive->ctl = *(BIOS+8);
2921: drive->present = 1;
2922: }
2923: BIOS += 16;
2924: }
2925: #endif
2926: }
2927:
2928: /*
2929: * This routine only knows how to look for drive units 0 and 1
2930: * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
2931: */
2932: static void probe_hwif (ide_hwif_t *hwif)
2933: {
2934: unsigned int unit;
2935:
2936: if (hwif->noprobe)
2937: return;
2938: if (hwif->io_base == HD_DATA)
2939: probe_cmos_for_drives (hwif);
2940: #if CONFIG_BLK_DEV_PROMISE
2941: if (!hwif->is_promise2 &&
2942: (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1))) {
2943: #else
2944: if (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1)) {
2945: #endif /* CONFIG_BLK_DEV_PROMISE */
2946: int msgout = 0;
2947: for (unit = 0; unit < MAX_DRIVES; ++unit) {
2948: ide_drive_t *drive = &hwif->drives[unit];
2949: if (drive->present) {
2950: drive->present = 0;
2951: printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
2952: msgout = 1;
2953: }
2954: }
2955: if (!msgout)
2956: printk("%s: ports already in use, skipping probe\n", hwif->name);
2957: } else {
2958: unsigned long flags;
2959: save_flags(flags);
2960:
2961: sti(); /* needed for jiffies and irq probing */
2962: /*
2963: * Second drive should only exist if first drive was found,
2964: * but a lot of cdrom drives are configured as single slaves.
2965: */
2966: for (unit = 0; unit < MAX_DRIVES; ++unit) {
2967: ide_drive_t *drive = &hwif->drives[unit];
2968: (void) probe_for_drive (drive);
2969: if (drive->present && drive->media == ide_disk) {
2970: if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
2971: printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
2972: drive->name, drive->head);
2973: drive->present = 0;
2974: }
2975: }
2976: if (drive->present && !hwif->present) {
2977: hwif->present = 1;
2978: request_region(hwif->io_base, 8, hwif->name);
2979: request_region(hwif->ctl_port, 1, hwif->name);
2980: }
2981: }
2982: restore_flags(flags);
2983: for (unit = 0; unit < MAX_DRIVES; ++unit) {
2984: ide_drive_t *drive = &hwif->drives[unit];
2985: if (drive->present && drive->media != ide_tape) {
2986: ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
2987: if (tuneproc != NULL && drive->autotune == 1)
2988: tuneproc(drive, 255); /* auto-tune PIO mode */
2989: }
2990: }
2991: }
2992: }
2993:
2994: /*
2995: * stridx() returns the offset of c within s,
2996: * or -1 if c is '\0' or not found within s.
2997: */
2998: static int stridx (const char *s, char c)
2999: {
3000: char *i = strchr(s, c);
3001: return (i && c) ? i - s : -1;
3002: }
3003:
3004: /*
3005: * match_parm() does parsing for ide_setup():
3006: *
3007: * 1. the first char of s must be '='.
3008: * 2. if the remainder matches one of the supplied keywords,
3009: * the index (1 based) of the keyword is negated and returned.
3010: * 3. if the remainder is a series of no more than max_vals numbers
3011: * separated by commas, the numbers are saved in vals[] and a
3012: * count of how many were saved is returned. Base10 is assumed,
3013: * and base16 is allowed when prefixed with "0x".
3014: * 4. otherwise, zero is returned.
3015: */
3016: static int match_parm (char *s, const char *keywords[], int vals[], int max_vals)
3017: {
3018: static const char *decimal = "0123456789";
3019: static const char *hex = "0123456789abcdef";
3020: int i, n;
3021:
3022: if (*s++ == '=') {
3023: /*
3024: * Try matching against the supplied keywords,
3025: * and return -(index+1) if we match one
3026: */
3027: if (keywords != NULL) {
3028: for (i = 0; *keywords != NULL; ++i) {
3029: if (!strcmp(s, *keywords++))
3030: return -(i+1);
3031: }
3032: }
3033: /*
3034: * Look for a series of no more than "max_vals"
3035: * numeric values separated by commas, in base10,
3036: * or base16 when prefixed with "0x".
3037: * Return a count of how many were found.
3038: */
3039: for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
3040: vals[n] = i;
3041: while ((i = stridx(decimal, *++s)) >= 0)
3042: vals[n] = (vals[n] * 10) + i;
3043: if (*s == 'x' && !vals[n]) {
3044: while ((i = stridx(hex, *++s)) >= 0)
3045: vals[n] = (vals[n] * 0x10) + i;
3046: }
3047: if (++n == max_vals)
3048: break;
3049: if (*s == ',')
3050: ++s;
3051: }
3052: if (!*s)
3053: return n;
3054: }
3055: return 0; /* zero = nothing matched */
3056: }
3057:
3058: /*
3059: * ide_setup() gets called VERY EARLY during initialization,
3060: * to handle kernel "command line" strings beginning with "hdx="
3061: * or "ide". Here is the complete set currently supported:
3062: *
3063: * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
3064: * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
3065: *
3066: * "hdx=noprobe" : drive may be present, but do not probe for it
3067: * "hdx=none" : drive is NOT present, ignore cmos and do not probe
3068: * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
3069: * "hdx=cdrom" : drive is present, and is a cdrom drive
3070: * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
3071: * "hdx=autotune" : driver will attempt to tune interface speed
3072: * to the fastest PIO mode supported,
3073: * if possible for this drive only.
3074: * Not fully supported by all chipset types,
3075: * and quite likely to cause trouble with
3076: * older/odd IDE drives.
3077: *
3078: * "idebus=xx" : inform IDE driver of VESA/PCI bus speed in Mhz,
3079: * where "xx" is between 20 and 66 inclusive,
3080: * used when tuning chipset PIO modes.
3081: * For PCI bus, 25 is correct for a P75 system,
3082: * 30 is correct for P90,P120,P180 systems,
3083: * and 33 is used for P100,P133,P166 systems.
3084: * If in doubt, use idebus=33 for PCI.
3085: * As for VLB, it is safest to not specify it.
3086: *
3087: * "idex=noprobe" : do not attempt to access/use this interface
3088: * "idex=base" : probe for an interface at the addr specified,
3089: * where "base" is usually 0x1f0 or 0x170
3090: * and "ctl" is assumed to be "base"+0x206
3091: * "idex=base,ctl" : specify both base and ctl
3092: * "idex=base,ctl,irq" : specify base, ctl, and irq number
3093: * "idex=autotune" : driver will attempt to tune interface speed
3094: * to the fastest PIO mode supported,
3095: * for all drives on this interface.
3096: * Not fully supported by all chipset types,
3097: * and quite likely to cause trouble with
3098: * older/odd IDE drives.
3099: * "idex=noautotune" : driver will NOT attempt to tune interface speed
3100: * This is the default for most chipsets,
3101: * except the cmd640.
3102: * "idex=serialize" : do not overlap operations on idex and ide(x^1)
3103: *
3104: * The following are valid ONLY on ide0,
3105: * and the defaults for the base,ctl ports must not be altered.
3106: *
3107: * "ide0=dtc2278" : probe/support DTC2278 interface
3108: * "ide0=ht6560b" : probe/support HT6560B interface
3109: * "ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
3110: * (not for PCI -- automatically detected)
3111: * "ide0=qd6580" : probe/support qd6580 interface
3112: * "ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
3113: * "ide0=umc8672" : probe/support umc8672 chipsets
3114: */
3115: void ide_setup (char *s)
3116: {
3117: int i, vals[3];
3118: ide_hwif_t *hwif;
3119: ide_drive_t *drive;
3120: unsigned int hw, unit;
3121: const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
3122: const char max_hwif = '0' + (MAX_HWIFS - 1);
3123:
3124: printk("ide_setup: %s", s);
3125: init_ide_data ();
3126:
3127: /*
3128: * Look for drive options: "hdx="
3129: */
3130: if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
3131: const char *hd_words[] = {"none", "noprobe", "nowerr", "cdrom",
3132: "serialize", "autotune", "noautotune",
3133: "slow", "ide-scsi", NULL};
3134: unit = s[2] - 'a';
3135: hw = unit / MAX_DRIVES;
3136: unit = unit % MAX_DRIVES;
3137: hwif = &ide_hwifs[hw];
3138: drive = &hwif->drives[unit];
3139: switch (match_parm(&s[3], hd_words, vals, 3)) {
3140: case -1: /* "none" */
3141: drive->nobios = 1; /* drop into "noprobe" */
3142: case -2: /* "noprobe" */
3143: drive->noprobe = 1;
3144: goto done;
3145: case -3: /* "nowerr" */
3146: drive->bad_wstat = BAD_R_STAT;
3147: hwif->noprobe = 0;
3148: goto done;
3149: case -4: /* "cdrom" */
3150: drive->present = 1;
3151: drive->media = ide_cdrom;
3152: hwif->noprobe = 0;
3153: goto done;
3154: case -5: /* "serialize" */
3155: printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
3156: goto do_serialize;
3157: case -6: /* "autotune" */
3158: drive->autotune = 1;
3159: goto done;
3160: case -7: /* "noautotune" */
3161: drive->autotune = 2;
3162: goto done;
3163: case -8: /* "slow" */
3164: drive->slow = 1;
3165: goto done;
3166: case -9: /* "ide-scsi" */
3167: drive->ide_scsi = 1;
3168: goto done;
3169: case 3: /* cyl,head,sect */
3170: drive->media = ide_disk;
3171: drive->cyl = drive->bios_cyl = vals[0];
3172: drive->head = drive->bios_head = vals[1];
3173: drive->sect = drive->bios_sect = vals[2];
3174: drive->present = 1;
3175: drive->forced_geom = 1;
3176: hwif->noprobe = 0;
3177: goto done;
3178: default:
3179: goto bad_option;
3180: }
3181: }
3182:
3183: if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
3184: goto bad_option;
3185: /*
3186: * Look for bus speed option: "idebus="
3187: */
3188: if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
3189: if (match_parm(&s[6], NULL, vals, 1) != 1)
3190: goto bad_option;
3191: if (vals[0] >= 20 && vals[0] <= 66)
3192: idebus_parameter = vals[0];
3193: else
3194: printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
3195: goto done;
3196: }
3197: /*
3198: * Look for interface options: "idex="
3199: */
3200: if (s[3] >= '0' && s[3] <= max_hwif) {
3201: /*
3202: * Be VERY CAREFUL changing this: note hardcoded indexes below
3203: */
3204: const char *ide_words[] = {"noprobe", "serialize", "autotune", "noautotune",
3205: "qd6580", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", "dc4030", NULL};
3206: hw = s[3] - '0';
3207: hwif = &ide_hwifs[hw];
3208: i = match_parm(&s[4], ide_words, vals, 3);
3209:
3210: /*
3211: * Cryptic check to ensure chipset not already set for hwif:
3212: */
3213: if (i > 0 || i <= -5) {
3214: if (hwif->chipset != ide_unknown)
3215: goto bad_option;
3216: if (i <= -5) {
3217: if (ide_hwifs[1].chipset != ide_unknown)
3218: goto bad_option;
3219: /*
3220: * Interface keywords work only for ide0:
3221: */
3222: if (hw != 0)
3223: goto bad_hwif;
3224: }
3225: }
3226:
3227: switch (i) {
3228: #ifdef CONFIG_BLK_DEV_PROMISE
3229: case -11: /* "dc4030" */
3230: {
3231: setup_dc4030(hwif);
3232: goto done;
3233: }
3234: #endif /* CONFIG_BLK_DEV_PROMISE */
3235: #ifdef CONFIG_BLK_DEV_ALI14XX
3236: case -10: /* "ali14xx" */
3237: {
3238: extern void init_ali14xx (void);
3239: init_ali14xx();
3240: goto done;
3241: }
3242: #endif /* CONFIG_BLK_DEV_ALI14XX */
3243: #ifdef CONFIG_BLK_DEV_UMC8672
3244: case -9: /* "umc8672" */
3245: {
3246: extern void init_umc8672 (void);
3247: init_umc8672();
3248: goto done;
3249: }
3250: #endif /* CONFIG_BLK_DEV_UMC8672 */
3251: #ifdef CONFIG_BLK_DEV_DTC2278
3252: case -8: /* "dtc2278" */
3253: {
3254: extern void init_dtc2278 (void);
3255: init_dtc2278();
3256: goto done;
3257: }
3258: #endif /* CONFIG_BLK_DEV_DTC2278 */
3259: #ifdef CONFIG_BLK_DEV_CMD640
3260: case -7: /* "cmd640_vlb" */
3261: {
3262: extern int cmd640_vlb; /* flag for cmd640.c */
3263: cmd640_vlb = 1;
3264: goto done;
3265: }
3266: #endif /* CONFIG_BLK_DEV_CMD640 */
3267: #ifdef CONFIG_BLK_DEV_HT6560B
3268: case -6: /* "ht6560b" */
3269: {
3270: extern void init_ht6560b (void);
3271: init_ht6560b();
3272: goto done;
3273: }
3274: #endif /* CONFIG_BLK_DEV_HT6560B */
3275: #if CONFIG_BLK_DEV_QD6580
3276: case -5: /* "qd6580" (has secondary i/f) */
3277: {
3278: extern void init_qd6580 (void);
3279: init_qd6580();
3280: goto done;
3281: }
3282: #endif /* CONFIG_BLK_DEV_QD6580 */
3283: case -4: /* "noautotune" */
3284: hwif->drives[0].autotune = 2;
3285: hwif->drives[1].autotune = 2;
3286: goto done;
3287: case -3: /* "autotune" */
3288: hwif->drives[0].autotune = 1;
3289: hwif->drives[1].autotune = 1;
3290: goto done;
3291: case -2: /* "serialize" */
3292: do_serialize:
3293: ide_hwifs[hw].serialized = 1; /* serialize */
3294: ide_hwifs[hw^1].serialized = 1; /* with mate */
3295: goto done;
3296:
3297: case -1: /* "noprobe" */
3298: hwif->noprobe = 1;
3299: goto done;
3300:
3301: case 1: /* base */
3302: vals[1] = vals[0] + 0x206; /* default ctl */
3303: case 2: /* base,ctl */
3304: vals[2] = 0; /* default irq = probe for it */
3305: case 3: /* base,ctl,irq */
3306: hwif->io_base = vals[0];
3307: hwif->ctl_port = vals[1];
3308: hwif->irq = vals[2];
3309: hwif->noprobe = 0;
3310: hwif->chipset = ide_generic;
3311: goto done;
3312:
3313: case 0: goto bad_option;
3314: default:
3315: printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
3316: return;
3317: }
3318: }
3319: bad_option:
3320: printk(" -- BAD OPTION\n");
3321: return;
3322: bad_hwif:
3323: printk("-- NOT SUPPORTED ON ide%d", hw);
3324: done:
3325: printk("\n");
3326: }
3327:
3328: /*
3329: * This routine is called from the partition-table code in genhd.c
3330: * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
3331: *
1.1.1.2 ! root 3332: * The second parameter, "xparm", determines exactly how the translation
1.1 root 3333: * will be handled:
3334: * 0 = convert to CHS with fewer than 1024 cyls
3335: * using the same method as Ontrack DiskManager.
3336: * 1 = same as "0", plus offset everything by 63 sectors.
3337: * -1 = similar to "0", plus redirect sector 0 to sector 1.
3338: * >1 = convert to a CHS geometry with "xparm" heads.
3339: *
1.1.1.2 ! root 3340: * Returns 0 if the translation was not possible, if the device was not
1.1 root 3341: * an IDE disk drive, or if a geometry was "forced" on the commandline.
3342: * Returns 1 if the geometry translation was successful.
3343: */
3344: int ide_xlate_1024 (kdev_t i_rdev, int xparm, const char *msg)
3345: {
3346: ide_drive_t *drive;
3347: static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
3348: const byte *heads = head_vals;
3349: unsigned long tracks;
3350:
3351: if ((drive = get_info_ptr(i_rdev)) == NULL || drive->forced_geom)
3352: return 0;
3353:
3354: if (xparm > 1 && xparm <= drive->bios_head && drive->bios_sect == 63)
3355: return 0; /* we already have a translation */
3356:
3357: printk("%s ", msg);
3358:
3359: if (drive->id) {
3360: drive->cyl = drive->id->cyls;
3361: drive->head = drive->id->heads;
3362: drive->sect = drive->id->sectors;
3363: }
3364: drive->bios_cyl = drive->cyl;
3365: drive->bios_head = drive->head;
3366: drive->bios_sect = drive->sect;
3367: drive->special.b.set_geometry = 1;
3368:
3369: tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
3370: drive->bios_sect = 63;
3371: if (xparm > 1) {
3372: drive->bios_head = xparm;
3373: drive->bios_cyl = tracks / drive->bios_head;
3374: } else {
3375: while (drive->bios_cyl >= 1024) {
3376: drive->bios_head = *heads;
3377: drive->bios_cyl = tracks / drive->bios_head;
3378: if (0 == *++heads)
3379: break;
3380: }
3381: #if FAKE_FDISK_FOR_EZDRIVE
3382: if (xparm == -1) {
3383: drive->remap_0_to_1 = 1;
3384: msg = "0->1";
3385: } else
3386: #endif /* FAKE_FDISK_FOR_EZDRIVE */
3387: if (xparm == 1) {
3388: drive->sect0 = 63;
3389: drive->bios_cyl = (tracks - 1) / drive->bios_head;
3390: msg = "+63";
3391: }
3392: printk("[remap %s] ", msg);
3393: }
3394: drive->part[0].nr_sects = current_capacity(drive);
3395: printk("[%d/%d/%d]", drive->bios_cyl, drive->bios_head, drive->bios_sect);
3396: return 1;
3397: }
3398:
3399: #if MAX_HWIFS > 1
3400: /*
3401: * save_match() is used to simplify logic in init_irq() below.
3402: *
3403: * A loophole here is that we may not know about a particular
3404: * hwif's irq until after that hwif is actually probed/initialized..
3405: * This could be a problem for the case where an hwif is on a
3406: * dual interface that requires serialization (eg. cmd640) and another
3407: * hwif using one of the same irqs is initialized beforehand.
3408: *
3409: * This routine detects and reports such situations, but does not fix them.
3410: */
3411: static void save_match (ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
3412: {
3413: ide_hwif_t *m = *match;
3414:
3415: if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
3416: if (!new->hwgroup)
3417: return;
3418: printk("%s: potential irq problem with %s and %s\n", hwif->name, new->name, m->name);
3419: }
3420: if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
3421: *match = new;
3422: }
3423: #endif /* MAX_HWIFS > 1 */
3424:
3425: /*
3426: * This routine sets up the irq for an ide interface, and creates a new
3427: * hwgroup for the irq/hwif if none was previously assigned.
3428: *
3429: * Much of the code is for correctly detecting/handling irq sharing
3430: * and irq serialization situations. This is somewhat complex because
3431: * it handles static as well as dynamic (PCMCIA) IDE interfaces.
3432: *
3433: * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
3434: * interrupts completely disabled. This can be bad for interrupt latency,
3435: * but anything else has led to problems on some machines. We re-enable
3436: * interrupts as much as we can safely do in most places.
3437: */
3438: static int init_irq (ide_hwif_t *hwif)
3439: {
3440: unsigned long flags;
3441: #if MAX_HWIFS > 1
3442: unsigned int index;
3443: #endif /* MAX_HWIFS > 1 */
3444: ide_hwgroup_t *hwgroup;
3445: ide_hwif_t *match = NULL;
3446:
3447: save_flags(flags);
3448: cli();
3449:
3450: hwif->hwgroup = NULL;
3451: #if MAX_HWIFS > 1
3452: /*
3453: * Group up with any other hwifs that share our irq(s).
3454: */
3455: for (index = 0; index < MAX_HWIFS; index++) {
3456: ide_hwif_t *h = &ide_hwifs[index];
3457: if (h->hwgroup) { /* scan only initialized hwif's */
3458: if (hwif->irq == h->irq) {
3459: hwif->sharing_irq = h->sharing_irq = 1;
3460: save_match(hwif, h, &match);
3461: }
3462: if (hwif->serialized) {
3463: ide_hwif_t *mate = &ide_hwifs[hwif->index^1];
3464: if (index == mate->index || h->irq == mate->irq)
3465: save_match(hwif, h, &match);
3466: }
3467: if (h->serialized) {
3468: ide_hwif_t *mate = &ide_hwifs[h->index^1];
3469: if (hwif->irq == mate->irq)
3470: save_match(hwif, h, &match);
3471: }
3472: }
3473: }
3474: #endif /* MAX_HWIFS > 1 */
3475: /*
3476: * If we are still without a hwgroup, then form a new one
3477: */
3478: if (match) {
3479: hwgroup = match->hwgroup;
3480: } else {
3481: hwgroup = kmalloc(sizeof(ide_hwgroup_t), GFP_KERNEL);
3482: hwgroup->hwif = hwgroup->next_hwif = hwif->next = hwif;
3483: hwgroup->rq = NULL;
3484: hwgroup->handler = NULL;
3485: if (hwif->drives[0].present)
3486: hwgroup->drive = &hwif->drives[0];
3487: else
3488: hwgroup->drive = &hwif->drives[1];
3489: hwgroup->poll_timeout = 0;
3490: hwgroup->active = 0;
3491: init_timer(&hwgroup->timer);
3492: hwgroup->timer.function = &timer_expiry;
3493: hwgroup->timer.data = (unsigned long) hwgroup;
3494: }
3495:
3496: /*
3497: * Allocate the irq, if not already obtained for another hwif
3498: */
3499: if (!match || match->irq != hwif->irq) {
3500: if (request_irq(hwif->irq, ide_intr, SA_INTERRUPT, hwif->name, hwgroup)) {
3501: if (!match)
3502: kfree(hwgroup);
3503: restore_flags(flags);
3504: return 1;
3505: }
3506: }
3507:
3508: /*
3509: * Everything is okay, so link us into the hwgroup
3510: */
3511: hwif->hwgroup = hwgroup;
3512: hwif->next = hwgroup->hwif->next;
3513: hwgroup->hwif->next = hwif;
3514:
3515: restore_flags(flags); /* safe now that hwif->hwgroup is set up */
3516:
3517: printk("%s at 0x%03x-0x%03x,0x%03x on irq %d", hwif->name,
3518: hwif->io_base, hwif->io_base+7, hwif->ctl_port, hwif->irq);
3519: if (match)
3520: printk(" (%sed with %s)", hwif->sharing_irq ? "shar" : "serializ", match->name);
3521: printk("\n");
3522: return 0;
3523: }
3524:
3525: static struct file_operations ide_fops = {
3526: NULL, /* lseek - default */
3527: block_read, /* read - general block-dev read */
3528: block_write, /* write - general block-dev write */
3529: NULL, /* readdir - bad */
3530: NULL, /* select */
3531: ide_ioctl, /* ioctl */
3532: NULL, /* mmap */
3533: ide_open, /* open */
3534: ide_release, /* release */
3535: block_fsync /* fsync */
3536: ,NULL, /* fasync */
3537: ide_check_media_change, /* check_media_change */
3538: revalidate_disk /* revalidate */
3539: };
3540:
3541: #ifdef CONFIG_PCI
3542: #if defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON)
3543:
3544: typedef void (ide_pci_init_proc_t)(byte, byte);
3545:
3546: /*
3547: * ide_probe_pci() scans PCI for a specific vendor/device function,
3548: * and invokes the supplied init routine for each instance detected.
3549: */
3550: static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
3551: {
3552: unsigned long flags;
3553: unsigned index;
3554: byte fn, bus;
3555:
3556: save_flags(flags);
3557: cli();
3558: for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
3559: init (bus, fn + func_adj);
3560: }
3561: restore_flags(flags);
3562: }
3563:
3564: #endif /* defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON) */
3565:
3566: static void ide_probe_promise_20246(void)
3567: {
3568: byte fn, bus;
3569: unsigned short io[6], count = 0;
3570: unsigned int reg, tmp, i;
3571: ide_hwif_t *hwif;
3572:
3573: memset(io, 0, 6 * sizeof(unsigned short));
3574: if (pcibios_find_device(PCI_VENDOR_ID_PROMISE, PCI_DEVICE_ID_PROMISE_20246, 0, &bus, &fn))
3575: return;
3576: printk("ide: Promise Technology IDE Ultra-DMA 33 on PCI bus %d function %d\n", bus, fn);
3577: for (reg = PCI_BASE_ADDRESS_0; reg <= PCI_BASE_ADDRESS_5; reg += 4) {
3578: pcibios_read_config_dword(bus, fn, reg, &tmp);
3579: if (tmp & PCI_BASE_ADDRESS_SPACE_IO)
3580: io[count++] = tmp & PCI_BASE_ADDRESS_IO_MASK;
3581: }
3582: for (i = 2; i < 4; i++) {
3583: hwif = ide_hwifs + i;
3584: if (hwif->chipset == ide_generic) {
3585: printk("ide%d: overridden with command line parameter\n", i);
3586: return;
3587: }
3588: tmp = (i - 2) * 2;
3589: if (!io[tmp] || !io[tmp + 1]) {
3590: printk("ide%d: invalid port address %x, %x -- aborting\n", i, io[tmp], io[tmp + 1]);
3591: return;
3592: }
3593: hwif->io_base = io[tmp];
3594: hwif->ctl_port = io[tmp + 1] + 2;
3595: hwif->noprobe = 0;
3596: }
3597: #ifdef CONFIG_BLK_DEV_TRITON
3598: ide_init_promise (bus, fn, &ide_hwifs[2], &ide_hwifs[3], io[4]);
3599: #endif /* CONFIG_BLK_DEV_TRITON */
3600: }
3601:
3602: #endif /* CONFIG_PCI */
3603:
3604: /*
3605: * ide_init_pci() finds/initializes "known" PCI IDE interfaces
3606: *
3607: * This routine should ideally be using pcibios_find_class() to find
3608: * all IDE interfaces, but that function causes some systems to "go weird".
3609: */
3610: static void probe_for_hwifs (void)
3611: {
3612: #ifdef CONFIG_PCI
3613: /*
3614: * Find/initialize PCI IDE interfaces
3615: */
3616: if (pcibios_present()) {
3617: #ifdef CONFIG_BLK_DEV_RZ1000
3618: ide_pci_init_proc_t init_rz1000;
3619: ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
3620: ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, &init_rz1000, 0);
3621: #endif /* CONFIG_BLK_DEV_RZ1000 */
3622: #ifdef CONFIG_BLK_DEV_TRITON
3623: /*
3624: * Apparently the BIOS32 services on Intel motherboards are
3625: * buggy and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
3626: * So instead, we search for PCI_DEVICE_ID_INTEL_82371_0,
3627: * and then add 1.
3628: */
3629: ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
3630: ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_1, &ide_init_triton, 0);
3631: ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB, &ide_init_triton, 0);
3632: #endif /* CONFIG_BLK_DEV_TRITON */
3633: ide_probe_promise_20246();
3634: }
3635: #endif /* CONFIG_PCI */
3636: #ifdef CONFIG_BLK_DEV_CMD640
3637: {
3638: extern void ide_probe_for_cmd640x (void);
3639: ide_probe_for_cmd640x();
3640: }
3641: #endif
3642: #ifdef CONFIG_BLK_DEV_PROMISE
3643: init_dc4030();
3644: #endif
3645: }
3646:
3647: static int hwif_init (int h)
3648: {
3649: ide_hwif_t *hwif = &ide_hwifs[h];
3650: void (*rfn)(void);
1.1.1.2 ! root 3651:
1.1 root 3652: if (!hwif->present)
3653: return 0;
3654: if (!hwif->irq) {
3655: if (!(hwif->irq = default_irqs[h])) {
3656: printk("%s: DISABLED, NO IRQ\n", hwif->name);
3657: return (hwif->present = 0);
3658: }
3659: }
3660: #ifdef CONFIG_BLK_DEV_HD
3661: if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
3662: printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
3663: return (hwif->present = 0);
3664: }
3665: #endif /* CONFIG_BLK_DEV_HD */
1.1.1.2 ! root 3666:
1.1 root 3667: hwif->present = 0; /* we set it back to 1 if all is ok below */
3668: switch (hwif->major) {
3669: case IDE0_MAJOR: rfn = &do_ide0_request; break;
3670: #if MAX_HWIFS > 1
3671: case IDE1_MAJOR: rfn = &do_ide1_request; break;
3672: #endif
3673: #if MAX_HWIFS > 2
3674: case IDE2_MAJOR: rfn = &do_ide2_request; break;
3675: #endif
3676: #if MAX_HWIFS > 3
3677: case IDE3_MAJOR: rfn = &do_ide3_request; break;
3678: #endif
3679: default:
3680: printk("%s: request_fn NOT DEFINED\n", hwif->name);
3681: return (hwif->present = 0);
3682: }
3683: if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
3684: printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
3685: } else if (init_irq (hwif)) {
3686: printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
3687: (void) unregister_blkdev (hwif->major, hwif->name);
3688: } else {
3689: init_gendisk(hwif);
3690: blk_dev[hwif->major].request_fn = rfn;
3691: read_ahead[hwif->major] = 8; /* (4kB) */
3692: hwif->present = 1; /* success */
3693: }
3694: return hwif->present;
3695: }
3696:
3697: /*
3698: * This is gets invoked once during initialization, to set *everything* up
3699: */
3700: int ide_init (void)
3701: {
3702: int index;
3703:
3704: init_ide_data ();
3705: /*
3706: * Probe for special "known" interface chipsets
3707: */
3708: probe_for_hwifs ();
3709:
3710: /*
3711: * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
3712: */
3713: for (index = 0; index < MAX_HWIFS; ++index)
3714: probe_hwif (&ide_hwifs[index]);
3715: for (index = 0; index < MAX_HWIFS; ++index)
3716: hwif_init (index);
3717:
3718: #ifdef CONFIG_BLK_DEV_IDETAPE
3719: idetape_register_chrdev(); /* Register character device interface to the ide tape */
3720: #endif /* CONFIG_BLK_DEV_IDETAPE */
1.1.1.2 ! root 3721:
1.1 root 3722: return 0;
3723: }
3724:
3725: #ifdef CONFIG_BLK_DEV_IDE_PCMCIA
3726: int ide_register(int io_base, int ctl_port, int irq)
3727: {
3728: int index, i, rc = -1;
3729: ide_hwif_t *hwif;
3730: ide_drive_t *drive;
3731: unsigned long flags;
3732:
3733: save_flags(flags);
3734: cli();
3735: for (index = 0; index < MAX_HWIFS; ++index) {
3736: hwif = &ide_hwifs[index];
3737: if (hwif->present) {
3738: if (hwif->io_base == io_base || hwif->ctl_port == ctl_port)
3739: break; /* this ide port already exists */
3740: } else {
3741: hwif->io_base = io_base;
3742: hwif->ctl_port = ctl_port;
3743: hwif->irq = irq;
3744: hwif->noprobe = 0;
3745: probe_hwif(hwif);
3746: if (!hwif_init(index))
3747: break;
3748: for (i = 0; i < hwif->gd->nr_real; i++) {
3749: drive = &hwif->drives[i];
3750: revalidate_disk(MKDEV(hwif->major, i<<PARTN_BITS));
3751: #ifdef CONFIG_BLK_DEV_IDECD
3752: if (drive->present && drive->media == ide_cdrom)
3753: ide_cdrom_setup(drive);
3754: #endif /* CONFIG_BLK_DEV_IDECD */
3755: }
3756: rc = index;
3757: break;
3758: }
3759: }
3760: restore_flags(flags);
3761: return rc;
3762: }
3763:
3764: void ide_unregister (unsigned int index)
3765: {
3766: struct gendisk *gd, **gdp;
3767: ide_hwif_t *hwif, *g;
3768: ide_hwgroup_t *hwgroup;
3769: int irq_count = 0;
3770: unsigned long flags;
3771:
3772: if (index >= MAX_HWIFS)
3773: return;
3774: save_flags(flags);
3775: cli();
3776: hwif = &ide_hwifs[index];
3777: if (!hwif->present || hwif->drives[0].busy || hwif->drives[1].busy) {
3778: restore_flags(flags);
3779: return;
3780: }
3781: hwif->present = 0;
3782: hwgroup = hwif->hwgroup;
3783:
3784: /*
3785: * free the irq if we were the only hwif using it
3786: */
3787: g = hwgroup->hwif;
3788: do {
3789: if (g->irq == hwif->irq)
3790: ++irq_count;
3791: g = g->next;
3792: } while (g != hwgroup->hwif);
3793: if (irq_count == 1)
3794: free_irq(hwif->irq, hwgroup);
3795:
3796: /*
3797: * Note that we only release the standard ports,
3798: * and do not even try to handle any extra ports
3799: * allocated for weird IDE interface chipsets.
3800: */
3801: release_region(hwif->io_base, 8);
3802: release_region(hwif->ctl_port, 1);
3803:
3804: /*
3805: * Remove us from the hwgroup, and free
3806: * the hwgroup if we were the only member
3807: */
3808: while (hwgroup->hwif->next != hwif)
3809: hwgroup->hwif = hwgroup->hwif->next;
3810: hwgroup->hwif->next = hwif->next;
3811: if (hwgroup->hwif == hwif)
3812: hwgroup->hwif = hwif->next;
3813: if (hwgroup->next_hwif == hwif)
3814: hwgroup->next_hwif = hwif->next;
3815: if (hwgroup->hwif == hwif)
3816: kfree(hwgroup);
3817:
3818: /*
3819: * Remove us from the kernel's knowledge
3820: */
3821: unregister_blkdev(hwif->major, hwif->name);
3822: kfree(blksize_size[hwif->major]);
3823: blk_dev[hwif->major].request_fn = NULL;
3824: blksize_size[hwif->major] = NULL;
3825: for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next))
3826: if (*gdp == hwif->gd)
3827: break;
3828: if (*gdp == NULL)
3829: printk("gd not in disk chain!\n");
3830: else {
3831: gd = *gdp; *gdp = gd->next;
3832: kfree(gd->sizes);
3833: kfree(gd->part);
3834: kfree(gd);
3835: }
3836: init_hwif_data (index); /* restore hwif data to pristine status */
3837: restore_flags(flags);
3838: }
3839: #endif /* CONFIG_BLK_DEV_IDE_PCMCIA */
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