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/drivers/ide/ide-floppy.c

https://bitbucket.org/ndreys/linux-sunxi
C | 543 lines | 385 code | 92 blank | 66 comment | 64 complexity | d02e3aeb46f8bf60cb964693f515a404 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * IDE ATAPI floppy driver.
  3 *
  4 * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
  5 * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
  6 * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
  7 *
  8 * This driver supports the following IDE floppy drives:
  9 *
 10 * LS-120/240 SuperDisk
 11 * Iomega Zip 100/250
 12 * Iomega PC Card Clik!/PocketZip
 13 *
 14 * For a historical changelog see
 15 * Documentation/ide/ChangeLog.ide-floppy.1996-2002
 16 */
 17
 18#include <linux/types.h>
 19#include <linux/string.h>
 20#include <linux/kernel.h>
 21#include <linux/delay.h>
 22#include <linux/timer.h>
 23#include <linux/mm.h>
 24#include <linux/interrupt.h>
 25#include <linux/major.h>
 26#include <linux/errno.h>
 27#include <linux/genhd.h>
 28#include <linux/cdrom.h>
 29#include <linux/ide.h>
 30#include <linux/hdreg.h>
 31#include <linux/bitops.h>
 32#include <linux/mutex.h>
 33#include <linux/scatterlist.h>
 34
 35#include <scsi/scsi_ioctl.h>
 36
 37#include <asm/byteorder.h>
 38#include <linux/irq.h>
 39#include <linux/uaccess.h>
 40#include <linux/io.h>
 41#include <asm/unaligned.h>
 42
 43#include "ide-floppy.h"
 44
 45/*
 46 * After each failed packet command we issue a request sense command and retry
 47 * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
 48 */
 49#define IDEFLOPPY_MAX_PC_RETRIES	3
 50
 51/* format capacities descriptor codes */
 52#define CAPACITY_INVALID	0x00
 53#define CAPACITY_UNFORMATTED	0x01
 54#define CAPACITY_CURRENT	0x02
 55#define CAPACITY_NO_CARTRIDGE	0x03
 56
 57/*
 58 * The following delay solves a problem with ATAPI Zip 100 drive where BSY bit
 59 * was apparently being deasserted before the unit was ready to receive data.
 60 */
 61#define IDEFLOPPY_PC_DELAY	(HZ/20)	/* default delay for ZIP 100 (50ms) */
 62
 63static int ide_floppy_callback(ide_drive_t *drive, int dsc)
 64{
 65	struct ide_disk_obj *floppy = drive->driver_data;
 66	struct ide_atapi_pc *pc = drive->pc;
 67	struct request *rq = pc->rq;
 68	int uptodate = pc->error ? 0 : 1;
 69
 70	ide_debug_log(IDE_DBG_FUNC, "enter");
 71
 72	if (drive->failed_pc == pc)
 73		drive->failed_pc = NULL;
 74
 75	if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
 76	    rq->cmd_type == REQ_TYPE_BLOCK_PC)
 77		uptodate = 1; /* FIXME */
 78	else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
 79
 80		u8 *buf = bio_data(rq->bio);
 81
 82		if (!pc->error) {
 83			floppy->sense_key = buf[2] & 0x0F;
 84			floppy->asc = buf[12];
 85			floppy->ascq = buf[13];
 86			floppy->progress_indication = buf[15] & 0x80 ?
 87				(u16)get_unaligned((u16 *)&buf[16]) : 0x10000;
 88
 89			if (drive->failed_pc)
 90				ide_debug_log(IDE_DBG_PC, "pc = %x",
 91					      drive->failed_pc->c[0]);
 92
 93			ide_debug_log(IDE_DBG_SENSE, "sense key = %x, asc = %x,"
 94				      "ascq = %x", floppy->sense_key,
 95				      floppy->asc, floppy->ascq);
 96		} else
 97			printk(KERN_ERR PFX "Error in REQUEST SENSE itself - "
 98			       "Aborting request!\n");
 99	}
100
101	if (rq->cmd_type == REQ_TYPE_SPECIAL)
102		rq->errors = uptodate ? 0 : IDE_DRV_ERROR_GENERAL;
103
104	return uptodate;
105}
106
107static void ide_floppy_report_error(struct ide_disk_obj *floppy,
108				    struct ide_atapi_pc *pc)
109{
110	/* suppress error messages resulting from Medium not present */
111	if (floppy->sense_key == 0x02 &&
112	    floppy->asc       == 0x3a &&
113	    floppy->ascq      == 0x00)
114		return;
115
116	printk(KERN_ERR PFX "%s: I/O error, pc = %2x, key = %2x, "
117			"asc = %2x, ascq = %2x\n",
118			floppy->drive->name, pc->c[0], floppy->sense_key,
119			floppy->asc, floppy->ascq);
120
121}
122
123static ide_startstop_t ide_floppy_issue_pc(ide_drive_t *drive,
124					   struct ide_cmd *cmd,
125					   struct ide_atapi_pc *pc)
126{
127	struct ide_disk_obj *floppy = drive->driver_data;
128
129	if (drive->failed_pc == NULL &&
130	    pc->c[0] != GPCMD_REQUEST_SENSE)
131		drive->failed_pc = pc;
132
133	/* Set the current packet command */
134	drive->pc = pc;
135
136	if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
137		unsigned int done = blk_rq_bytes(drive->hwif->rq);
138
139		if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
140			ide_floppy_report_error(floppy, pc);
141
142		/* Giving up */
143		pc->error = IDE_DRV_ERROR_GENERAL;
144
145		drive->failed_pc = NULL;
146		drive->pc_callback(drive, 0);
147		ide_complete_rq(drive, -EIO, done);
148		return ide_stopped;
149	}
150
151	ide_debug_log(IDE_DBG_FUNC, "retry #%d", pc->retries);
152
153	pc->retries++;
154
155	return ide_issue_pc(drive, cmd);
156}
157
158void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
159{
160	ide_init_pc(pc);
161	pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
162	pc->c[7] = 255;
163	pc->c[8] = 255;
164	pc->req_xfer = 255;
165}
166
167/* A mode sense command is used to "sense" floppy parameters. */
168void ide_floppy_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
169{
170	u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */
171
172	ide_init_pc(pc);
173	pc->c[0] = GPCMD_MODE_SENSE_10;
174	pc->c[1] = 0;
175	pc->c[2] = page_code;
176
177	switch (page_code) {
178	case IDEFLOPPY_CAPABILITIES_PAGE:
179		length += 12;
180		break;
181	case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
182		length += 32;
183		break;
184	default:
185		printk(KERN_ERR PFX "unsupported page code in %s\n", __func__);
186	}
187	put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
188	pc->req_xfer = length;
189}
190
191static void idefloppy_create_rw_cmd(ide_drive_t *drive,
192				    struct ide_atapi_pc *pc, struct request *rq,
193				    unsigned long sector)
194{
195	struct ide_disk_obj *floppy = drive->driver_data;
196	int block = sector / floppy->bs_factor;
197	int blocks = blk_rq_sectors(rq) / floppy->bs_factor;
198	int cmd = rq_data_dir(rq);
199
200	ide_debug_log(IDE_DBG_FUNC, "block: %d, blocks: %d", block, blocks);
201
202	ide_init_pc(pc);
203	pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
204	put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
205	put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);
206
207	memcpy(rq->cmd, pc->c, 12);
208
209	pc->rq = rq;
210	if (rq->cmd_flags & REQ_WRITE)
211		pc->flags |= PC_FLAG_WRITING;
212
213	pc->flags |= PC_FLAG_DMA_OK;
214}
215
216static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
217		struct ide_atapi_pc *pc, struct request *rq)
218{
219	ide_init_pc(pc);
220	memcpy(pc->c, rq->cmd, sizeof(pc->c));
221	pc->rq = rq;
222	if (blk_rq_bytes(rq)) {
223		pc->flags |= PC_FLAG_DMA_OK;
224		if (rq_data_dir(rq) == WRITE)
225			pc->flags |= PC_FLAG_WRITING;
226	}
227}
228
229static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
230					     struct request *rq, sector_t block)
231{
232	struct ide_disk_obj *floppy = drive->driver_data;
233	struct ide_cmd cmd;
234	struct ide_atapi_pc *pc;
235
236	ide_debug_log(IDE_DBG_FUNC, "enter, cmd: 0x%x\n", rq->cmd[0]);
237
238	if (drive->debug_mask & IDE_DBG_RQ)
239		blk_dump_rq_flags(rq, (rq->rq_disk
240					? rq->rq_disk->disk_name
241					: "dev?"));
242
243	if (rq->errors >= ERROR_MAX) {
244		if (drive->failed_pc) {
245			ide_floppy_report_error(floppy, drive->failed_pc);
246			drive->failed_pc = NULL;
247		} else
248			printk(KERN_ERR PFX "%s: I/O error\n", drive->name);
249
250		if (rq->cmd_type == REQ_TYPE_SPECIAL) {
251			rq->errors = 0;
252			ide_complete_rq(drive, 0, blk_rq_bytes(rq));
253			return ide_stopped;
254		} else
255			goto out_end;
256	}
257
258	switch (rq->cmd_type) {
259	case REQ_TYPE_FS:
260		if (((long)blk_rq_pos(rq) % floppy->bs_factor) ||
261		    (blk_rq_sectors(rq) % floppy->bs_factor)) {
262			printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
263				drive->name);
264			goto out_end;
265		}
266		pc = &floppy->queued_pc;
267		idefloppy_create_rw_cmd(drive, pc, rq, (unsigned long)block);
268		break;
269	case REQ_TYPE_SPECIAL:
270	case REQ_TYPE_SENSE:
271		pc = (struct ide_atapi_pc *)rq->special;
272		break;
273	case REQ_TYPE_BLOCK_PC:
274		pc = &floppy->queued_pc;
275		idefloppy_blockpc_cmd(floppy, pc, rq);
276		break;
277	default:
278		BUG();
279	}
280
281	ide_prep_sense(drive, rq);
282
283	memset(&cmd, 0, sizeof(cmd));
284
285	if (rq_data_dir(rq))
286		cmd.tf_flags |= IDE_TFLAG_WRITE;
287
288	cmd.rq = rq;
289
290	if (rq->cmd_type == REQ_TYPE_FS || blk_rq_bytes(rq)) {
291		ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
292		ide_map_sg(drive, &cmd);
293	}
294
295	pc->rq = rq;
296
297	return ide_floppy_issue_pc(drive, &cmd, pc);
298out_end:
299	drive->failed_pc = NULL;
300	if (rq->cmd_type != REQ_TYPE_FS && rq->errors == 0)
301		rq->errors = -EIO;
302	ide_complete_rq(drive, -EIO, blk_rq_bytes(rq));
303	return ide_stopped;
304}
305
306/*
307 * Look at the flexible disk page parameters. We ignore the CHS capacity
308 * parameters and use the LBA parameters instead.
309 */
310static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive,
311					     struct ide_atapi_pc *pc)
312{
313	struct ide_disk_obj *floppy = drive->driver_data;
314	struct gendisk *disk = floppy->disk;
315	u8 *page, buf[40];
316	int capacity, lba_capacity;
317	u16 transfer_rate, sector_size, cyls, rpm;
318	u8 heads, sectors;
319
320	ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);
321
322	if (ide_queue_pc_tail(drive, disk, pc, buf, pc->req_xfer)) {
323		printk(KERN_ERR PFX "Can't get flexible disk page params\n");
324		return 1;
325	}
326
327	if (buf[3] & 0x80)
328		drive->dev_flags |= IDE_DFLAG_WP;
329	else
330		drive->dev_flags &= ~IDE_DFLAG_WP;
331
332	set_disk_ro(disk, !!(drive->dev_flags & IDE_DFLAG_WP));
333
334	page = &buf[8];
335
336	transfer_rate = be16_to_cpup((__be16 *)&buf[8 + 2]);
337	sector_size   = be16_to_cpup((__be16 *)&buf[8 + 6]);
338	cyls          = be16_to_cpup((__be16 *)&buf[8 + 8]);
339	rpm           = be16_to_cpup((__be16 *)&buf[8 + 28]);
340	heads         = buf[8 + 4];
341	sectors       = buf[8 + 5];
342
343	capacity = cyls * heads * sectors * sector_size;
344
345	if (memcmp(page, &floppy->flexible_disk_page, 32))
346		printk(KERN_INFO PFX "%s: %dkB, %d/%d/%d CHS, %d kBps, "
347				"%d sector size, %d rpm\n",
348				drive->name, capacity / 1024, cyls, heads,
349				sectors, transfer_rate / 8, sector_size, rpm);
350
351	memcpy(&floppy->flexible_disk_page, page, 32);
352	drive->bios_cyl = cyls;
353	drive->bios_head = heads;
354	drive->bios_sect = sectors;
355	lba_capacity = floppy->blocks * floppy->block_size;
356
357	if (capacity < lba_capacity) {
358		printk(KERN_NOTICE PFX "%s: The disk reports a capacity of %d "
359			"bytes, but the drive only handles %d\n",
360			drive->name, lba_capacity, capacity);
361		floppy->blocks = floppy->block_size ?
362			capacity / floppy->block_size : 0;
363		drive->capacity64 = floppy->blocks * floppy->bs_factor;
364	}
365
366	return 0;
367}
368
369/*
370 * Determine if a media is present in the floppy drive, and if so, its LBA
371 * capacity.
372 */
373static int ide_floppy_get_capacity(ide_drive_t *drive)
374{
375	struct ide_disk_obj *floppy = drive->driver_data;
376	struct gendisk *disk = floppy->disk;
377	struct ide_atapi_pc pc;
378	u8 *cap_desc;
379	u8 pc_buf[256], header_len, desc_cnt;
380	int i, rc = 1, blocks, length;
381
382	ide_debug_log(IDE_DBG_FUNC, "enter");
383
384	drive->bios_cyl = 0;
385	drive->bios_head = drive->bios_sect = 0;
386	floppy->blocks = 0;
387	floppy->bs_factor = 1;
388	drive->capacity64 = 0;
389
390	ide_floppy_create_read_capacity_cmd(&pc);
391	if (ide_queue_pc_tail(drive, disk, &pc, pc_buf, pc.req_xfer)) {
392		printk(KERN_ERR PFX "Can't get floppy parameters\n");
393		return 1;
394	}
395	header_len = pc_buf[3];
396	cap_desc = &pc_buf[4];
397	desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
398
399	for (i = 0; i < desc_cnt; i++) {
400		unsigned int desc_start = 4 + i*8;
401
402		blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
403		length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);
404
405		ide_debug_log(IDE_DBG_PROBE, "Descriptor %d: %dkB, %d blocks, "
406					     "%d sector size",
407					     i, blocks * length / 1024,
408					     blocks, length);
409
410		if (i)
411			continue;
412		/*
413		 * the code below is valid only for the 1st descriptor, ie i=0
414		 */
415
416		switch (pc_buf[desc_start + 4] & 0x03) {
417		/* Clik! drive returns this instead of CAPACITY_CURRENT */
418		case CAPACITY_UNFORMATTED:
419			if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
420				/*
421				 * If it is not a clik drive, break out
422				 * (maintains previous driver behaviour)
423				 */
424				break;
425		case CAPACITY_CURRENT:
426			/* Normal Zip/LS-120 disks */
427			if (memcmp(cap_desc, &floppy->cap_desc, 8))
428				printk(KERN_INFO PFX "%s: %dkB, %d blocks, %d "
429				       "sector size\n",
430				       drive->name, blocks * length / 1024,
431				       blocks, length);
432			memcpy(&floppy->cap_desc, cap_desc, 8);
433
434			if (!length || length % 512) {
435				printk(KERN_NOTICE PFX "%s: %d bytes block size"
436				       " not supported\n", drive->name, length);
437			} else {
438				floppy->blocks = blocks;
439				floppy->block_size = length;
440				floppy->bs_factor = length / 512;
441				if (floppy->bs_factor != 1)
442					printk(KERN_NOTICE PFX "%s: Warning: "
443					       "non 512 bytes block size not "
444					       "fully supported\n",
445					       drive->name);
446				drive->capacity64 =
447					floppy->blocks * floppy->bs_factor;
448				rc = 0;
449			}
450			break;
451		case CAPACITY_NO_CARTRIDGE:
452			/*
453			 * This is a KERN_ERR so it appears on screen
454			 * for the user to see
455			 */
456			printk(KERN_ERR PFX "%s: No disk in drive\n",
457			       drive->name);
458			break;
459		case CAPACITY_INVALID:
460			printk(KERN_ERR PFX "%s: Invalid capacity for disk "
461				"in drive\n", drive->name);
462			break;
463		}
464		ide_debug_log(IDE_DBG_PROBE, "Descriptor 0 Code: %d",
465					     pc_buf[desc_start + 4] & 0x03);
466	}
467
468	/* Clik! disk does not support get_flexible_disk_page */
469	if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
470		(void) ide_floppy_get_flexible_disk_page(drive, &pc);
471
472	return rc;
473}
474
475static void ide_floppy_setup(ide_drive_t *drive)
476{
477	struct ide_disk_obj *floppy = drive->driver_data;
478	u16 *id = drive->id;
479
480	drive->pc_callback	 = ide_floppy_callback;
481
482	/*
483	 * We used to check revisions here. At this point however I'm giving up.
484	 * Just assume they are all broken, its easier.
485	 *
486	 * The actual reason for the workarounds was likely a driver bug after
487	 * all rather than a firmware bug, and the workaround below used to hide
488	 * it. It should be fixed as of version 1.9, but to be on the safe side
489	 * we'll leave the limitation below for the 2.2.x tree.
490	 */
491	if (!strncmp((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI", 20)) {
492		drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
493		/* This value will be visible in the /proc/ide/hdx/settings */
494		drive->pc_delay = IDEFLOPPY_PC_DELAY;
495		blk_queue_max_hw_sectors(drive->queue, 64);
496	}
497
498	/*
499	 * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
500	 * nasty clicking noises without it, so please don't remove this.
501	 */
502	if (strncmp((char *)&id[ATA_ID_PROD], "IOMEGA Clik!", 11) == 0) {
503		blk_queue_max_hw_sectors(drive->queue, 64);
504		drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
505		/* IOMEGA Clik! drives do not support lock/unlock commands */
506		drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
507	}
508
509	(void) ide_floppy_get_capacity(drive);
510
511	ide_proc_register_driver(drive, floppy->driver);
512
513	drive->dev_flags |= IDE_DFLAG_ATTACH;
514}
515
516static void ide_floppy_flush(ide_drive_t *drive)
517{
518}
519
520static int ide_floppy_init_media(ide_drive_t *drive, struct gendisk *disk)
521{
522	int ret = 0;
523
524	if (ide_do_test_unit_ready(drive, disk))
525		ide_do_start_stop(drive, disk, 1);
526
527	ret = ide_floppy_get_capacity(drive);
528
529	set_capacity(disk, ide_gd_capacity(drive));
530
531	return ret;
532}
533
534const struct ide_disk_ops ide_atapi_disk_ops = {
535	.check		= ide_check_atapi_device,
536	.get_capacity	= ide_floppy_get_capacity,
537	.setup		= ide_floppy_setup,
538	.flush		= ide_floppy_flush,
539	.init_media	= ide_floppy_init_media,
540	.set_doorlock	= ide_set_media_lock,
541	.do_request	= ide_floppy_do_request,
542	.ioctl		= ide_floppy_ioctl,
543};