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[PATCH] ppc32: Fix address checking on lmw/stmw align exception
[linux-2.6/verdex.git] / drivers / ide / ide-lib.c
blob6806d407e9c12ab41250e69daffaccca919dd4d6
1 #include <linux/config.h>
2 #include <linux/module.h>
3 #include <linux/types.h>
4 #include <linux/string.h>
5 #include <linux/kernel.h>
6 #include <linux/timer.h>
7 #include <linux/mm.h>
8 #include <linux/interrupt.h>
9 #include <linux/major.h>
10 #include <linux/errno.h>
11 #include <linux/genhd.h>
12 #include <linux/blkpg.h>
13 #include <linux/slab.h>
14 #include <linux/pci.h>
15 #include <linux/delay.h>
16 #include <linux/hdreg.h>
17 #include <linux/ide.h>
18 #include <linux/bitops.h>
19
20 #include <asm/byteorder.h>
21 #include <asm/irq.h>
22 #include <asm/uaccess.h>
23 #include <asm/io.h>
24
25 /*
26 * IDE library routines. These are plug in code that most
27 * drivers can use but occasionally may be weird enough
28 * to want to do their own thing with
29 *
30 * Add common non I/O op stuff here. Make sure it has proper
31 * kernel-doc function headers or your patch will be rejected
32 */
33
34
35 /**
36 * ide_xfer_verbose - return IDE mode names
37 * @xfer_rate: rate to name
38 *
39 * Returns a constant string giving the name of the mode
40 * requested.
41 */
42
43 char *ide_xfer_verbose (u8 xfer_rate)
44 {
45 switch(xfer_rate) {
46 case XFER_UDMA_7: return("UDMA 7");
47 case XFER_UDMA_6: return("UDMA 6");
48 case XFER_UDMA_5: return("UDMA 5");
49 case XFER_UDMA_4: return("UDMA 4");
50 case XFER_UDMA_3: return("UDMA 3");
51 case XFER_UDMA_2: return("UDMA 2");
52 case XFER_UDMA_1: return("UDMA 1");
53 case XFER_UDMA_0: return("UDMA 0");
54 case XFER_MW_DMA_2: return("MW DMA 2");
55 case XFER_MW_DMA_1: return("MW DMA 1");
56 case XFER_MW_DMA_0: return("MW DMA 0");
57 case XFER_SW_DMA_2: return("SW DMA 2");
58 case XFER_SW_DMA_1: return("SW DMA 1");
59 case XFER_SW_DMA_0: return("SW DMA 0");
60 case XFER_PIO_4: return("PIO 4");
61 case XFER_PIO_3: return("PIO 3");
62 case XFER_PIO_2: return("PIO 2");
63 case XFER_PIO_1: return("PIO 1");
64 case XFER_PIO_0: return("PIO 0");
65 case XFER_PIO_SLOW: return("PIO SLOW");
66 default: return("XFER ERROR");
67 }
68 }
69
70 EXPORT_SYMBOL(ide_xfer_verbose);
71
72 /**
73 * ide_dma_speed - compute DMA speed
74 * @drive: drive
75 * @mode; intended mode
76 *
77 * Checks the drive capabilities and returns the speed to use
78 * for the transfer. Returns -1 if the requested mode is unknown
79 * (eg PIO)
80 */
81
82 u8 ide_dma_speed(ide_drive_t *drive, u8 mode)
83 {
84 struct hd_driveid *id = drive->id;
85 ide_hwif_t *hwif = HWIF(drive);
86 u8 speed = 0;
87
88 if (drive->media != ide_disk && hwif->atapi_dma == 0)
89 return 0;
90
91 switch(mode) {
92 case 0x04:
93 if ((id->dma_ultra & 0x0040) &&
94 (id->dma_ultra & hwif->ultra_mask))
95 { speed = XFER_UDMA_6; break; }
96 case 0x03:
97 if ((id->dma_ultra & 0x0020) &&
98 (id->dma_ultra & hwif->ultra_mask))
99 { speed = XFER_UDMA_5; break; }
100 case 0x02:
101 if ((id->dma_ultra & 0x0010) &&
102 (id->dma_ultra & hwif->ultra_mask))
103 { speed = XFER_UDMA_4; break; }
104 if ((id->dma_ultra & 0x0008) &&
105 (id->dma_ultra & hwif->ultra_mask))
106 { speed = XFER_UDMA_3; break; }
107 case 0x01:
108 if ((id->dma_ultra & 0x0004) &&
109 (id->dma_ultra & hwif->ultra_mask))
110 { speed = XFER_UDMA_2; break; }
111 if ((id->dma_ultra & 0x0002) &&
112 (id->dma_ultra & hwif->ultra_mask))
113 { speed = XFER_UDMA_1; break; }
114 if ((id->dma_ultra & 0x0001) &&
115 (id->dma_ultra & hwif->ultra_mask))
116 { speed = XFER_UDMA_0; break; }
117 case 0x00:
118 if ((id->dma_mword & 0x0004) &&
119 (id->dma_mword & hwif->mwdma_mask))
120 { speed = XFER_MW_DMA_2; break; }
121 if ((id->dma_mword & 0x0002) &&
122 (id->dma_mword & hwif->mwdma_mask))
123 { speed = XFER_MW_DMA_1; break; }
124 if ((id->dma_mword & 0x0001) &&
125 (id->dma_mword & hwif->mwdma_mask))
126 { speed = XFER_MW_DMA_0; break; }
127 if ((id->dma_1word & 0x0004) &&
128 (id->dma_1word & hwif->swdma_mask))
129 { speed = XFER_SW_DMA_2; break; }
130 if ((id->dma_1word & 0x0002) &&
131 (id->dma_1word & hwif->swdma_mask))
132 { speed = XFER_SW_DMA_1; break; }
133 if ((id->dma_1word & 0x0001) &&
134 (id->dma_1word & hwif->swdma_mask))
135 { speed = XFER_SW_DMA_0; break; }
136 }
137
138 // printk("%s: %s: mode 0x%02x, speed 0x%02x\n",
139 // __FUNCTION__, drive->name, mode, speed);
140
141 return speed;
142 }
143
144 EXPORT_SYMBOL(ide_dma_speed);
145
146
147 /**
148 * ide_rate_filter - return best speed for mode
149 * @mode: modes available
150 * @speed: desired speed
151 *
152 * Given the available DMA/UDMA mode this function returns
153 * the best available speed at or below the speed requested.
154 */
155
156 u8 ide_rate_filter (u8 mode, u8 speed)
157 {
158 #ifdef CONFIG_BLK_DEV_IDEDMA
159 static u8 speed_max[] = {
160 XFER_MW_DMA_2, XFER_UDMA_2, XFER_UDMA_4,
161 XFER_UDMA_5, XFER_UDMA_6
162 };
163
164 // printk("%s: mode 0x%02x, speed 0x%02x\n", __FUNCTION__, mode, speed);
165
166 /* So that we remember to update this if new modes appear */
167 if (mode > 4)
168 BUG();
169 return min(speed, speed_max[mode]);
170 #else /* !CONFIG_BLK_DEV_IDEDMA */
171 return min(speed, (u8)XFER_PIO_4);
172 #endif /* CONFIG_BLK_DEV_IDEDMA */
173 }
174
175 EXPORT_SYMBOL(ide_rate_filter);
176
177 int ide_dma_enable (ide_drive_t *drive)
178 {
179 ide_hwif_t *hwif = HWIF(drive);
180 struct hd_driveid *id = drive->id;
181
182 return ((int) ((((id->dma_ultra >> 8) & hwif->ultra_mask) ||
183 ((id->dma_mword >> 8) & hwif->mwdma_mask) ||
184 ((id->dma_1word >> 8) & hwif->swdma_mask)) ? 1 : 0));
185 }
186
187 EXPORT_SYMBOL(ide_dma_enable);
188
189 /*
190 * Standard (generic) timings for PIO modes, from ATA2 specification.
191 * These timings are for access to the IDE data port register *only*.
192 * Some drives may specify a mode, while also specifying a different
193 * value for cycle_time (from drive identification data).
194 */
195 const ide_pio_timings_t ide_pio_timings[6] = {
196 { 70, 165, 600 }, /* PIO Mode 0 */
197 { 50, 125, 383 }, /* PIO Mode 1 */
198 { 30, 100, 240 }, /* PIO Mode 2 */
199 { 30, 80, 180 }, /* PIO Mode 3 with IORDY */
200 { 25, 70, 120 }, /* PIO Mode 4 with IORDY */
201 { 20, 50, 100 } /* PIO Mode 5 with IORDY (nonstandard) */
202 };
203
204 EXPORT_SYMBOL_GPL(ide_pio_timings);
205
206 /*
207 * Shared data/functions for determining best PIO mode for an IDE drive.
208 * Most of this stuff originally lived in cmd640.c, and changes to the
209 * ide_pio_blacklist[] table should be made with EXTREME CAUTION to avoid
210 * breaking the fragile cmd640.c support.
211 */
212
213 /*
214 * Black list. Some drives incorrectly report their maximal PIO mode,
215 * at least in respect to CMD640. Here we keep info on some known drives.
216 */
217 static struct ide_pio_info {
218 const char *name;
219 int pio;
220 } ide_pio_blacklist [] = {
221 /* { "Conner Peripherals 1275MB - CFS1275A", 4 }, */
222 { "Conner Peripherals 540MB - CFS540A", 3 },
223
224 { "WDC AC2700", 3 },
225 { "WDC AC2540", 3 },
226 { "WDC AC2420", 3 },
227 { "WDC AC2340", 3 },
228 { "WDC AC2250", 0 },
229 { "WDC AC2200", 0 },
230 { "WDC AC21200", 4 },
231 { "WDC AC2120", 0 },
232 { "WDC AC2850", 3 },
233 { "WDC AC1270", 3 },
234 { "WDC AC1170", 1 },
235 { "WDC AC1210", 1 },
236 { "WDC AC280", 0 },
237 /* { "WDC AC21000", 4 }, */
238 { "WDC AC31000", 3 },
239 { "WDC AC31200", 3 },
240 /* { "WDC AC31600", 4 }, */
241
242 { "Maxtor 7131 AT", 1 },
243 { "Maxtor 7171 AT", 1 },
244 { "Maxtor 7213 AT", 1 },
245 { "Maxtor 7245 AT", 1 },
246 { "Maxtor 7345 AT", 1 },
247 { "Maxtor 7546 AT", 3 },
248 { "Maxtor 7540 AV", 3 },
249
250 { "SAMSUNG SHD-3121A", 1 },
251 { "SAMSUNG SHD-3122A", 1 },
252 { "SAMSUNG SHD-3172A", 1 },
253
254 /* { "ST51080A", 4 },
255 * { "ST51270A", 4 },
256 * { "ST31220A", 4 },
257 * { "ST31640A", 4 },
258 * { "ST32140A", 4 },
259 * { "ST3780A", 4 },
260 */
261 { "ST5660A", 3 },
262 { "ST3660A", 3 },
263 { "ST3630A", 3 },
264 { "ST3655A", 3 },
265 { "ST3391A", 3 },
266 { "ST3390A", 1 },
267 { "ST3600A", 1 },
268 { "ST3290A", 0 },
269 { "ST3144A", 0 },
270 { "ST3491A", 1 }, /* reports 3, should be 1 or 2 (depending on */
271 /* drive) according to Seagates FIND-ATA program */
272
273 { "QUANTUM ELS127A", 0 },
274 { "QUANTUM ELS170A", 0 },
275 { "QUANTUM LPS240A", 0 },
276 { "QUANTUM LPS210A", 3 },
277 { "QUANTUM LPS270A", 3 },
278 { "QUANTUM LPS365A", 3 },
279 { "QUANTUM LPS540A", 3 },
280 { "QUANTUM LIGHTNING 540A", 3 },
281 { "QUANTUM LIGHTNING 730A", 3 },
282
283 { "QUANTUM FIREBALL_540", 3 }, /* Older Quantum Fireballs don't work */
284 { "QUANTUM FIREBALL_640", 3 },
285 { "QUANTUM FIREBALL_1080", 3 },
286 { "QUANTUM FIREBALL_1280", 3 },
287 { NULL, 0 }
288 };
289
290 /**
291 * ide_scan_pio_blacklist - check for a blacklisted drive
292 * @model: Drive model string
293 *
294 * This routine searches the ide_pio_blacklist for an entry
295 * matching the start/whole of the supplied model name.
296 *
297 * Returns -1 if no match found.
298 * Otherwise returns the recommended PIO mode from ide_pio_blacklist[].
299 */
300
301 static int ide_scan_pio_blacklist (char *model)
302 {
303 struct ide_pio_info *p;
304
305 for (p = ide_pio_blacklist; p->name != NULL; p++) {
306 if (strncmp(p->name, model, strlen(p->name)) == 0)
307 return p->pio;
308 }
309 return -1;
310 }
311
312 /**
313 * ide_get_best_pio_mode - get PIO mode from drive
314 * @driver: drive to consider
315 * @mode_wanted: preferred mode
316 * @max_mode: highest allowed
317 * @d: pio data
318 *
319 * This routine returns the recommended PIO settings for a given drive,
320 * based on the drive->id information and the ide_pio_blacklist[].
321 * This is used by most chipset support modules when "auto-tuning".
322 *
323 * Drive PIO mode auto selection
324 */
325
326 u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode, ide_pio_data_t *d)
327 {
328 int pio_mode;
329 int cycle_time = 0;
330 int use_iordy = 0;
331 struct hd_driveid* id = drive->id;
332 int overridden = 0;
333 int blacklisted = 0;
334
335 if (mode_wanted != 255) {
336 pio_mode = mode_wanted;
337 } else if (!drive->id) {
338 pio_mode = 0;
339 } else if ((pio_mode = ide_scan_pio_blacklist(id->model)) != -1) {
340 overridden = 1;
341 blacklisted = 1;
342 use_iordy = (pio_mode > 2);
343 } else {
344 pio_mode = id->tPIO;
345 if (pio_mode > 2) { /* 2 is maximum allowed tPIO value */
346 pio_mode = 2;
347 overridden = 1;
348 }
349 if (id->field_valid & 2) { /* drive implements ATA2? */
350 if (id->capability & 8) { /* drive supports use_iordy? */
351 use_iordy = 1;
352 cycle_time = id->eide_pio_iordy;
353 if (id->eide_pio_modes & 7) {
354 overridden = 0;
355 if (id->eide_pio_modes & 4)
356 pio_mode = 5;
357 else if (id->eide_pio_modes & 2)
358 pio_mode = 4;
359 else
360 pio_mode = 3;
361 }
362 } else {
363 cycle_time = id->eide_pio;
364 }
365 }
366
367 #if 0
368 if (drive->id->major_rev_num & 0x0004) printk("ATA-2 ");
369 #endif
370
371 /*
372 * Conservative "downgrade" for all pre-ATA2 drives
373 */
374 if (pio_mode && pio_mode < 4) {
375 pio_mode--;
376 overridden = 1;
377 #if 0
378 use_iordy = (pio_mode > 2);
379 #endif
380 if (cycle_time && cycle_time < ide_pio_timings[pio_mode].cycle_time)
381 cycle_time = 0; /* use standard timing */
382 }
383 }
384 if (pio_mode > max_mode) {
385 pio_mode = max_mode;
386 cycle_time = 0;
387 }
388 if (d) {
389 d->pio_mode = pio_mode;
390 d->cycle_time = cycle_time ? cycle_time : ide_pio_timings[pio_mode].cycle_time;
391 d->use_iordy = use_iordy;
392 d->overridden = overridden;
393 d->blacklisted = blacklisted;
394 }
395 return pio_mode;
396 }
397
398 EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
399
400 /**
401 * ide_toggle_bounce - handle bounce buffering
402 * @drive: drive to update
403 * @on: on/off boolean
404 *
405 * Enable or disable bounce buffering for the device. Drives move
406 * between PIO and DMA and that changes the rules we need.
407 */
408
409 void ide_toggle_bounce(ide_drive_t *drive, int on)
410 {
411 u64 addr = BLK_BOUNCE_HIGH; /* dma64_addr_t */
412
413 if (on && drive->media == ide_disk) {
414 if (!PCI_DMA_BUS_IS_PHYS)
415 addr = BLK_BOUNCE_ANY;
416 else if (HWIF(drive)->pci_dev)
417 addr = HWIF(drive)->pci_dev->dma_mask;
418 }
419
420 if (drive->queue)
421 blk_queue_bounce_limit(drive->queue, addr);
422 }
423
424 /**
425 * ide_set_xfer_rate - set transfer rate
426 * @drive: drive to set
427 * @speed: speed to attempt to set
428 *
429 * General helper for setting the speed of an IDE device. This
430 * function knows about user enforced limits from the configuration
431 * which speedproc() does not. High level drivers should never
432 * invoke speedproc() directly.
433 */
434
435 int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
436 {
437 #ifndef CONFIG_BLK_DEV_IDEDMA
438 rate = min(rate, (u8) XFER_PIO_4);
439 #endif
440 if(HWIF(drive)->speedproc)
441 return HWIF(drive)->speedproc(drive, rate);
442 else
443 return -1;
444 }
445
446 EXPORT_SYMBOL_GPL(ide_set_xfer_rate);
447
448 static void ide_dump_opcode(ide_drive_t *drive)
449 {
450 struct request *rq;
451 u8 opcode = 0;
452 int found = 0;
453
454 spin_lock(&ide_lock);
455 rq = NULL;
456 if (HWGROUP(drive))
457 rq = HWGROUP(drive)->rq;
458 spin_unlock(&ide_lock);
459 if (!rq)
460 return;
461 if (rq->flags & (REQ_DRIVE_CMD | REQ_DRIVE_TASK)) {
462 char *args = rq->buffer;
463 if (args) {
464 opcode = args[0];
465 found = 1;
466 }
467 } else if (rq->flags & REQ_DRIVE_TASKFILE) {
468 ide_task_t *args = rq->special;
469 if (args) {
470 task_struct_t *tf = (task_struct_t *) args->tfRegister;
471 opcode = tf->command;
472 found = 1;
473 }
474 }
475
476 printk("ide: failed opcode was: ");
477 if (!found)
478 printk("unknown\n");
479 else
480 printk("0x%02x\n", opcode);
481 }
482
483 static u8 ide_dump_ata_status(ide_drive_t *drive, const char *msg, u8 stat)
484 {
485 ide_hwif_t *hwif = HWIF(drive);
486 unsigned long flags;
487 u8 err = 0;
488
489 local_irq_set(flags);
490 printk("%s: %s: status=0x%02x", drive->name, msg, stat);
491 printk(" { ");
492 if (stat & BUSY_STAT)
493 printk("Busy ");
494 else {
495 if (stat & READY_STAT) printk("DriveReady ");
496 if (stat & WRERR_STAT) printk("DeviceFault ");
497 if (stat & SEEK_STAT) printk("SeekComplete ");
498 if (stat & DRQ_STAT) printk("DataRequest ");
499 if (stat & ECC_STAT) printk("CorrectedError ");
500 if (stat & INDEX_STAT) printk("Index ");
501 if (stat & ERR_STAT) printk("Error ");
502 }
503 printk("}");
504 printk("\n");
505 if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
506 err = hwif->INB(IDE_ERROR_REG);
507 printk("%s: %s: error=0x%02x", drive->name, msg, err);
508 printk(" { ");
509 if (err & ABRT_ERR) printk("DriveStatusError ");
510 if (err & ICRC_ERR)
511 printk("Bad%s ", (err & ABRT_ERR) ? "CRC" : "Sector");
512 if (err & ECC_ERR) printk("UncorrectableError ");
513 if (err & ID_ERR) printk("SectorIdNotFound ");
514 if (err & TRK0_ERR) printk("TrackZeroNotFound ");
515 if (err & MARK_ERR) printk("AddrMarkNotFound ");
516 printk("}");
517 if ((err & (BBD_ERR | ABRT_ERR)) == BBD_ERR ||
518 (err & (ECC_ERR|ID_ERR|MARK_ERR))) {
519 if (drive->addressing == 1) {
520 __u64 sectors = 0;
521 u32 low = 0, high = 0;
522 low = ide_read_24(drive);
523 hwif->OUTB(drive->ctl|0x80, IDE_CONTROL_REG);
524 high = ide_read_24(drive);
525 sectors = ((__u64)high << 24) | low;
526 printk(", LBAsect=%llu, high=%d, low=%d",
527 (unsigned long long) sectors,
528 high, low);
529 } else {
530 u8 cur = hwif->INB(IDE_SELECT_REG);
531 if (cur & 0x40) { /* using LBA? */
532 printk(", LBAsect=%ld", (unsigned long)
533 ((cur&0xf)<<24)
534 |(hwif->INB(IDE_HCYL_REG)<<16)
535 |(hwif->INB(IDE_LCYL_REG)<<8)
536 | hwif->INB(IDE_SECTOR_REG));
537 } else {
538 printk(", CHS=%d/%d/%d",
539 (hwif->INB(IDE_HCYL_REG)<<8) +
540 hwif->INB(IDE_LCYL_REG),
541 cur & 0xf,
542 hwif->INB(IDE_SECTOR_REG));
543 }
544 }
545 if (HWGROUP(drive) && HWGROUP(drive)->rq)
546 printk(", sector=%llu",
547 (unsigned long long)HWGROUP(drive)->rq->sector);
548 }
549 }
550 printk("\n");
551 ide_dump_opcode(drive);
552 local_irq_restore(flags);
553 return err;
554 }
555
556 /**
557 * ide_dump_atapi_status - print human readable atapi status
558 * @drive: drive that status applies to
559 * @msg: text message to print
560 * @stat: status byte to decode
561 *
562 * Error reporting, in human readable form (luxurious, but a memory hog).
563 */
564
565 static u8 ide_dump_atapi_status(ide_drive_t *drive, const char *msg, u8 stat)
566 {
567 unsigned long flags;
568
569 atapi_status_t status;
570 atapi_error_t error;
571
572 status.all = stat;
573 error.all = 0;
574 local_irq_set(flags);
575 printk("%s: %s: status=0x%02x { ", drive->name, msg, stat);
576 if (status.b.bsy)
577 printk("Busy ");
578 else {
579 if (status.b.drdy) printk("DriveReady ");
580 if (status.b.df) printk("DeviceFault ");
581 if (status.b.dsc) printk("SeekComplete ");
582 if (status.b.drq) printk("DataRequest ");
583 if (status.b.corr) printk("CorrectedError ");
584 if (status.b.idx) printk("Index ");
585 if (status.b.check) printk("Error ");
586 }
587 printk("}\n");
588 if (status.b.check && !status.b.bsy) {
589 error.all = HWIF(drive)->INB(IDE_ERROR_REG);
590 printk("%s: %s: error=0x%02x { ", drive->name, msg, error.all);
591 if (error.b.ili) printk("IllegalLengthIndication ");
592 if (error.b.eom) printk("EndOfMedia ");
593 if (error.b.abrt) printk("AbortedCommand ");
594 if (error.b.mcr) printk("MediaChangeRequested ");
595 if (error.b.sense_key) printk("LastFailedSense=0x%02x ",
596 error.b.sense_key);
597 printk("}\n");
598 }
599 ide_dump_opcode(drive);
600 local_irq_restore(flags);
601 return error.all;
602 }
603
604 /**
605 * ide_dump_status - translate ATA/ATAPI error
606 * @drive: drive the error occured on
607 * @msg: information string
608 * @stat: status byte
609 *
610 * Error reporting, in human readable form (luxurious, but a memory hog).
611 * Combines the drive name, message and status byte to provide a
612 * user understandable explanation of the device error.
613 */
614
615 u8 ide_dump_status(ide_drive_t *drive, const char *msg, u8 stat)
616 {
617 if (drive->media == ide_disk)
618 return ide_dump_ata_status(drive, msg, stat);
619 return ide_dump_atapi_status(drive, msg, stat);
620 }
621
622 EXPORT_SYMBOL(ide_dump_status);
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