summaryrefslogtreecommitdiff
path: root/drivers/ide/ide-floppy.c
blob: af7503b47dbe3296d491cb2b246f82f0b9456e75 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
// SPDX-License-Identifier: GPL-2.0
/*
 * IDE ATAPI floppy driver.
 *
 * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
 * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
 * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
 *
 * This driver supports the following IDE floppy drives:
 *
 * LS-120/240 SuperDisk
 * Iomega Zip 100/250
 * Iomega PC Card Clik!/PocketZip
 *
 * For a historical changelog see
 * Documentation/ide/ChangeLog.ide-floppy.1996-2002
 */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/compat.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/cdrom.h>
#include <linux/ide.h>
#include <linux/hdreg.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>

#include <scsi/scsi_ioctl.h>

#include <asm/byteorder.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/unaligned.h>

#include "ide-floppy.h"

/*
 * After each failed packet command we issue a request sense command and retry
 * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
 */
#define IDEFLOPPY_MAX_PC_RETRIES	3

/* format capacities descriptor codes */
#define CAPACITY_INVALID	0x00
#define CAPACITY_UNFORMATTED	0x01
#define CAPACITY_CURRENT	0x02
#define CAPACITY_NO_CARTRIDGE	0x03

/*
 * The following delay solves a problem with ATAPI Zip 100 drive where BSY bit
 * was apparently being deasserted before the unit was ready to receive data.
 */
#define IDEFLOPPY_PC_DELAY	(HZ/20)	/* default delay for ZIP 100 (50ms) */

static int ide_floppy_callback(ide_drive_t *drive, int dsc)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	struct ide_atapi_pc *pc = drive->pc;
	struct request *rq = pc->rq;
	int uptodate = pc->error ? 0 : 1;

	ide_debug_log(IDE_DBG_FUNC, "enter");

	if (drive->failed_pc == pc)
		drive->failed_pc = NULL;

	if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
	    blk_rq_is_scsi(rq))
		uptodate = 1; /* FIXME */
	else if (pc->c[0] == GPCMD_REQUEST_SENSE) {

		u8 *buf = bio_data(rq->bio);

		if (!pc->error) {
			floppy->sense_key = buf[2] & 0x0F;
			floppy->asc = buf[12];
			floppy->ascq = buf[13];
			floppy->progress_indication = buf[15] & 0x80 ?
				(u16)get_unaligned((u16 *)&buf[16]) : 0x10000;

			if (drive->failed_pc)
				ide_debug_log(IDE_DBG_PC, "pc = %x",
					      drive->failed_pc->c[0]);

			ide_debug_log(IDE_DBG_SENSE, "sense key = %x, asc = %x,"
				      "ascq = %x", floppy->sense_key,
				      floppy->asc, floppy->ascq);
		} else
			printk(KERN_ERR PFX "Error in REQUEST SENSE itself - "
			       "Aborting request!\n");
	}

	if (ata_misc_request(rq))
		scsi_req(rq)->result = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;

	return uptodate;
}

static void ide_floppy_report_error(struct ide_disk_obj *floppy,
				    struct ide_atapi_pc *pc)
{
	/* suppress error messages resulting from Medium not present */
	if (floppy->sense_key == 0x02 &&
	    floppy->asc       == 0x3a &&
	    floppy->ascq      == 0x00)
		return;

	printk(KERN_ERR PFX "%s: I/O error, pc = %2x, key = %2x, "
			"asc = %2x, ascq = %2x\n",
			floppy->drive->name, pc->c[0], floppy->sense_key,
			floppy->asc, floppy->ascq);

}

static ide_startstop_t ide_floppy_issue_pc(ide_drive_t *drive,
					   struct ide_cmd *cmd,
					   struct ide_atapi_pc *pc)
{
	struct ide_disk_obj *floppy = drive->driver_data;

	if (drive->failed_pc == NULL &&
	    pc->c[0] != GPCMD_REQUEST_SENSE)
		drive->failed_pc = pc;

	/* Set the current packet command */
	drive->pc = pc;

	if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
		unsigned int done = blk_rq_bytes(drive->hwif->rq);

		if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
			ide_floppy_report_error(floppy, pc);

		/* Giving up */
		pc->error = IDE_DRV_ERROR_GENERAL;

		drive->failed_pc = NULL;
		drive->pc_callback(drive, 0);
		ide_complete_rq(drive, BLK_STS_IOERR, done);
		return ide_stopped;
	}

	ide_debug_log(IDE_DBG_FUNC, "retry #%d", pc->retries);

	pc->retries++;

	return ide_issue_pc(drive, cmd);
}

void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
{
	ide_init_pc(pc);
	pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
	pc->c[7] = 255;
	pc->c[8] = 255;
	pc->req_xfer = 255;
}

/* A mode sense command is used to "sense" floppy parameters. */
void ide_floppy_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
{
	u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */

	ide_init_pc(pc);
	pc->c[0] = GPCMD_MODE_SENSE_10;
	pc->c[1] = 0;
	pc->c[2] = page_code;

	switch (page_code) {
	case IDEFLOPPY_CAPABILITIES_PAGE:
		length += 12;
		break;
	case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
		length += 32;
		break;
	default:
		printk(KERN_ERR PFX "unsupported page code in %s\n", __func__);
	}
	put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
	pc->req_xfer = length;
}

static void idefloppy_create_rw_cmd(ide_drive_t *drive,
				    struct ide_atapi_pc *pc, struct request *rq,
				    unsigned long sector)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	int block = sector / floppy->bs_factor;
	int blocks = blk_rq_sectors(rq) / floppy->bs_factor;
	int cmd = rq_data_dir(rq);

	ide_debug_log(IDE_DBG_FUNC, "block: %d, blocks: %d", block, blocks);

	ide_init_pc(pc);
	pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
	put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
	put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);

	memcpy(scsi_req(rq)->cmd, pc->c, 12);

	pc->rq = rq;
	if (cmd == WRITE)
		pc->flags |= PC_FLAG_WRITING;

	pc->flags |= PC_FLAG_DMA_OK;
}

static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
		struct ide_atapi_pc *pc, struct request *rq)
{
	ide_init_pc(pc);
	memcpy(pc->c, scsi_req(rq)->cmd, sizeof(pc->c));
	pc->rq = rq;
	if (blk_rq_bytes(rq)) {
		pc->flags |= PC_FLAG_DMA_OK;
		if (rq_data_dir(rq) == WRITE)
			pc->flags |= PC_FLAG_WRITING;
	}
}

static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
					     struct request *rq, sector_t block)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	struct ide_cmd cmd;
	struct ide_atapi_pc *pc;

	ide_debug_log(IDE_DBG_FUNC, "enter, cmd: 0x%x\n", rq->cmd[0]);

	if (drive->debug_mask & IDE_DBG_RQ)
		blk_dump_rq_flags(rq, (rq->rq_disk
					? rq->rq_disk->disk_name
					: "dev?"));

	if (scsi_req(rq)->result >= ERROR_MAX) {
		if (drive->failed_pc) {
			ide_floppy_report_error(floppy, drive->failed_pc);
			drive->failed_pc = NULL;
		} else
			printk(KERN_ERR PFX "%s: I/O error\n", drive->name);

		if (ata_misc_request(rq)) {
			scsi_req(rq)->result = 0;
			ide_complete_rq(drive, BLK_STS_OK, blk_rq_bytes(rq));
			return ide_stopped;
		} else
			goto out_end;
	}

	switch (req_op(rq)) {
	default:
		if (((long)blk_rq_pos(rq) % floppy->bs_factor) ||
		    (blk_rq_sectors(rq) % floppy->bs_factor)) {
			printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
				drive->name);
			goto out_end;
		}
		pc = &floppy->queued_pc;
		idefloppy_create_rw_cmd(drive, pc, rq, (unsigned long)block);
		break;
	case REQ_OP_SCSI_IN:
	case REQ_OP_SCSI_OUT:
		pc = &floppy->queued_pc;
		idefloppy_blockpc_cmd(floppy, pc, rq);
		break;
	case REQ_OP_DRV_IN:
	case REQ_OP_DRV_OUT:
		switch (ide_req(rq)->type) {
		case ATA_PRIV_MISC:
		case ATA_PRIV_SENSE:
			pc = (struct ide_atapi_pc *)ide_req(rq)->special;
			break;
		default:
			BUG();
		}
	}

	ide_prep_sense(drive, rq);

	memset(&cmd, 0, sizeof(cmd));

	if (rq_data_dir(rq))
		cmd.tf_flags |= IDE_TFLAG_WRITE;

	cmd.rq = rq;

	if (!blk_rq_is_passthrough(rq) || blk_rq_bytes(rq)) {
		ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
		ide_map_sg(drive, &cmd);
	}

	pc->rq = rq;

	return ide_floppy_issue_pc(drive, &cmd, pc);
out_end:
	drive->failed_pc = NULL;
	if (blk_rq_is_passthrough(rq) && scsi_req(rq)->result == 0)
		scsi_req(rq)->result = -EIO;
	ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(rq));
	return ide_stopped;
}

/*
 * Look at the flexible disk page parameters. We ignore the CHS capacity
 * parameters and use the LBA parameters instead.
 */
static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive,
					     struct ide_atapi_pc *pc)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	struct gendisk *disk = floppy->disk;
	u8 *page, buf[40];
	int capacity, lba_capacity;
	u16 transfer_rate, sector_size, cyls, rpm;
	u8 heads, sectors;

	ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);

	if (ide_queue_pc_tail(drive, disk, pc, buf, pc->req_xfer)) {
		printk(KERN_ERR PFX "Can't get flexible disk page params\n");
		return 1;
	}

	if (buf[3] & 0x80)
		drive->dev_flags |= IDE_DFLAG_WP;
	else
		drive->dev_flags &= ~IDE_DFLAG_WP;

	set_disk_ro(disk, !!(drive->dev_flags & IDE_DFLAG_WP));

	page = &buf[8];

	transfer_rate = be16_to_cpup((__be16 *)&buf[8 + 2]);
	sector_size   = be16_to_cpup((__be16 *)&buf[8 + 6]);
	cyls          = be16_to_cpup((__be16 *)&buf[8 + 8]);
	rpm           = be16_to_cpup((__be16 *)&buf[8 + 28]);
	heads         = buf[8 + 4];
	sectors       = buf[8 + 5];

	capacity = cyls * heads * sectors * sector_size;

	if (memcmp(page, &floppy->flexible_disk_page, 32))
		printk(KERN_INFO PFX "%s: %dkB, %d/%d/%d CHS, %d kBps, "
				"%d sector size, %d rpm\n",
				drive->name, capacity / 1024, cyls, heads,
				sectors, transfer_rate / 8, sector_size, rpm);

	memcpy(&floppy->flexible_disk_page, page, 32);
	drive->bios_cyl = cyls;
	drive->bios_head = heads;
	drive->bios_sect = sectors;
	lba_capacity = floppy->blocks * floppy->block_size;

	if (capacity < lba_capacity) {
		printk(KERN_NOTICE PFX "%s: The disk reports a capacity of %d "
			"bytes, but the drive only handles %d\n",
			drive->name, lba_capacity, capacity);
		floppy->blocks = floppy->block_size ?
			capacity / floppy->block_size : 0;
		drive->capacity64 = floppy->blocks * floppy->bs_factor;
	}

	return 0;
}

/*
 * Determine if a media is present in the floppy drive, and if so, its LBA
 * capacity.
 */
static int ide_floppy_get_capacity(ide_drive_t *drive)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	struct gendisk *disk = floppy->disk;
	struct ide_atapi_pc pc;
	u8 *cap_desc;
	u8 pc_buf[256], header_len, desc_cnt;
	int i, rc = 1, blocks, length;

	ide_debug_log(IDE_DBG_FUNC, "enter");

	drive->bios_cyl = 0;
	drive->bios_head = drive->bios_sect = 0;
	floppy->blocks = 0;
	floppy->bs_factor = 1;
	drive->capacity64 = 0;

	ide_floppy_create_read_capacity_cmd(&pc);
	if (ide_queue_pc_tail(drive, disk, &pc, pc_buf, pc.req_xfer)) {
		printk(KERN_ERR PFX "Can't get floppy parameters\n");
		return 1;
	}
	header_len = pc_buf[3];
	cap_desc = &pc_buf[4];
	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */

	for (i = 0; i < desc_cnt; i++) {
		unsigned int desc_start = 4 + i*8;

		blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
		length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);

		ide_debug_log(IDE_DBG_PROBE, "Descriptor %d: %dkB, %d blocks, "
					     "%d sector size",
					     i, blocks * length / 1024,
					     blocks, length);

		if (i)
			continue;
		/*
		 * the code below is valid only for the 1st descriptor, ie i=0
		 */

		switch (pc_buf[desc_start + 4] & 0x03) {
		/* Clik! drive returns this instead of CAPACITY_CURRENT */
		case CAPACITY_UNFORMATTED:
			if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
				/*
				 * If it is not a clik drive, break out
				 * (maintains previous driver behaviour)
				 */
				break;
			fallthrough;
		case CAPACITY_CURRENT:
			/* Normal Zip/LS-120 disks */
			if (memcmp(cap_desc, &floppy->cap_desc, 8))
				printk(KERN_INFO PFX "%s: %dkB, %d blocks, %d "
				       "sector size\n",
				       drive->name, blocks * length / 1024,
				       blocks, length);
			memcpy(&floppy->cap_desc, cap_desc, 8);

			if (!length || length % 512) {
				printk(KERN_NOTICE PFX "%s: %d bytes block size"
				       " not supported\n", drive->name, length);
			} else {
				floppy->blocks = blocks;
				floppy->block_size = length;
				floppy->bs_factor = length / 512;
				if (floppy->bs_factor != 1)
					printk(KERN_NOTICE PFX "%s: Warning: "
					       "non 512 bytes block size not "
					       "fully supported\n",
					       drive->name);
				drive->capacity64 =
					floppy->blocks * floppy->bs_factor;
				rc = 0;
			}
			break;
		case CAPACITY_NO_CARTRIDGE:
			/*
			 * This is a KERN_ERR so it appears on screen
			 * for the user to see
			 */
			printk(KERN_ERR PFX "%s: No disk in drive\n",
			       drive->name);
			break;
		case CAPACITY_INVALID:
			printk(KERN_ERR PFX "%s: Invalid capacity for disk "
				"in drive\n", drive->name);
			break;
		}
		ide_debug_log(IDE_DBG_PROBE, "Descriptor 0 Code: %d",
					     pc_buf[desc_start + 4] & 0x03);
	}

	/* Clik! disk does not support get_flexible_disk_page */
	if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
		(void) ide_floppy_get_flexible_disk_page(drive, &pc);

	return rc;
}

static void ide_floppy_setup(ide_drive_t *drive)
{
	struct ide_disk_obj *floppy = drive->driver_data;
	u16 *id = drive->id;

	drive->pc_callback	 = ide_floppy_callback;

	/*
	 * We used to check revisions here. At this point however I'm giving up.
	 * Just assume they are all broken, its easier.
	 *
	 * The actual reason for the workarounds was likely a driver bug after
	 * all rather than a firmware bug, and the workaround below used to hide
	 * it. It should be fixed as of version 1.9, but to be on the safe side
	 * we'll leave the limitation below for the 2.2.x tree.
	 */
	if (strstarts((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI")) {
		drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
		/* This value will be visible in the /proc/ide/hdx/settings */
		drive->pc_delay = IDEFLOPPY_PC_DELAY;
		blk_queue_max_hw_sectors(drive->queue, 64);
	}

	/*
	 * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
	 * nasty clicking noises without it, so please don't remove this.
	 */
	if (strstarts((char *)&id[ATA_ID_PROD], "IOMEGA Clik!")) {
		blk_queue_max_hw_sectors(drive->queue, 64);
		drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
		/* IOMEGA Clik! drives do not support lock/unlock commands */
		drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
	}

	(void) ide_floppy_get_capacity(drive);

	ide_proc_register_driver(drive, floppy->driver);

	drive->dev_flags |= IDE_DFLAG_ATTACH;
}

static void ide_floppy_flush(ide_drive_t *drive)
{
}

static int ide_floppy_init_media(ide_drive_t *drive, struct gendisk *disk)
{
	int ret = 0;

	if (ide_do_test_unit_ready(drive, disk))
		ide_do_start_stop(drive, disk, 1);

	ret = ide_floppy_get_capacity(drive);

	set_capacity(disk, ide_gd_capacity(drive));

	return ret;
}

const struct ide_disk_ops ide_atapi_disk_ops = {
	.check		= ide_check_atapi_device,
	.get_capacity	= ide_floppy_get_capacity,
	.setup		= ide_floppy_setup,
	.flush		= ide_floppy_flush,
	.init_media	= ide_floppy_init_media,
	.set_doorlock	= ide_set_media_lock,
	.do_request	= ide_floppy_do_request,
	.ioctl		= ide_floppy_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= ide_floppy_compat_ioctl,
#endif
};