378a22ca55c1dcde362c8f41457dda630c5a05e2
[linux-2.6.git] / drivers / ide / ide-floppy.c
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 #define DRV_NAME "ide-floppy"
19
20 #define IDEFLOPPY_VERSION "1.00"
21
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/string.h>
25 #include <linux/kernel.h>
26 #include <linux/delay.h>
27 #include <linux/timer.h>
28 #include <linux/mm.h>
29 #include <linux/interrupt.h>
30 #include <linux/major.h>
31 #include <linux/errno.h>
32 #include <linux/genhd.h>
33 #include <linux/slab.h>
34 #include <linux/cdrom.h>
35 #include <linux/ide.h>
36 #include <linux/hdreg.h>
37 #include <linux/bitops.h>
38 #include <linux/mutex.h>
39 #include <linux/scatterlist.h>
40
41 #include <scsi/scsi_ioctl.h>
42
43 #include <asm/byteorder.h>
44 #include <linux/irq.h>
45 #include <linux/uaccess.h>
46 #include <linux/io.h>
47 #include <asm/unaligned.h>
48
49 #include "ide-floppy.h"
50
51 /* define to see debug info */
52 #define IDEFLOPPY_DEBUG_LOG             0
53
54 /* #define IDEFLOPPY_DEBUG(fmt, args...) printk(KERN_INFO fmt, ## args) */
55 #define IDEFLOPPY_DEBUG(fmt, args...)
56
57 #if IDEFLOPPY_DEBUG_LOG
58 #define debug_log(fmt, args...) \
59         printk(KERN_INFO "ide-floppy: " fmt, ## args)
60 #else
61 #define debug_log(fmt, args...) do {} while (0)
62 #endif
63
64 /*
65  * After each failed packet command we issue a request sense command and retry
66  * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
67  */
68 #define IDEFLOPPY_MAX_PC_RETRIES        3
69
70 /* format capacities descriptor codes */
71 #define CAPACITY_INVALID        0x00
72 #define CAPACITY_UNFORMATTED    0x01
73 #define CAPACITY_CURRENT        0x02
74 #define CAPACITY_NO_CARTRIDGE   0x03
75
76 #define IDEFLOPPY_TICKS_DELAY   HZ/20   /* default delay for ZIP 100 (50ms) */
77
78 /* Error code returned in rq->errors to the higher part of the driver. */
79 #define IDEFLOPPY_ERROR_GENERAL         101
80
81 static DEFINE_MUTEX(idefloppy_ref_mutex);
82
83 #define to_ide_floppy(obj) container_of(obj, struct ide_floppy_obj, kref)
84
85 #define ide_floppy_g(disk) \
86         container_of((disk)->private_data, struct ide_floppy_obj, driver)
87
88 static void idefloppy_cleanup_obj(struct kref *);
89
90 static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
91 {
92         struct ide_floppy_obj *floppy = NULL;
93
94         mutex_lock(&idefloppy_ref_mutex);
95         floppy = ide_floppy_g(disk);
96         if (floppy) {
97                 if (ide_device_get(floppy->drive))
98                         floppy = NULL;
99                 else
100                         kref_get(&floppy->kref);
101         }
102         mutex_unlock(&idefloppy_ref_mutex);
103         return floppy;
104 }
105
106 static void ide_floppy_put(struct ide_floppy_obj *floppy)
107 {
108         ide_drive_t *drive = floppy->drive;
109
110         mutex_lock(&idefloppy_ref_mutex);
111         kref_put(&floppy->kref, idefloppy_cleanup_obj);
112         ide_device_put(drive);
113         mutex_unlock(&idefloppy_ref_mutex);
114 }
115
116 /*
117  * Used to finish servicing a request. For read/write requests, we will call
118  * ide_end_request to pass to the next buffer.
119  */
120 static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
121 {
122         idefloppy_floppy_t *floppy = drive->driver_data;
123         struct request *rq = HWGROUP(drive)->rq;
124         int error;
125
126         debug_log("Reached %s\n", __func__);
127
128         switch (uptodate) {
129         case 0: error = IDEFLOPPY_ERROR_GENERAL; break;
130         case 1: error = 0; break;
131         default: error = uptodate;
132         }
133         if (error)
134                 floppy->failed_pc = NULL;
135         /* Why does this happen? */
136         if (!rq)
137                 return 0;
138         if (!blk_special_request(rq)) {
139                 /* our real local end request function */
140                 ide_end_request(drive, uptodate, nsecs);
141                 return 0;
142         }
143         rq->errors = error;
144         /* fixme: need to move this local also */
145         ide_end_drive_cmd(drive, 0, 0);
146         return 0;
147 }
148
149 static void idefloppy_update_buffers(ide_drive_t *drive,
150                                 struct ide_atapi_pc *pc)
151 {
152         struct request *rq = pc->rq;
153         struct bio *bio = rq->bio;
154
155         while ((bio = rq->bio) != NULL)
156                 idefloppy_end_request(drive, 1, 0);
157 }
158
159 static void ide_floppy_callback(ide_drive_t *drive, int dsc)
160 {
161         idefloppy_floppy_t *floppy = drive->driver_data;
162         struct ide_atapi_pc *pc = drive->pc;
163         int uptodate = pc->error ? 0 : 1;
164
165         debug_log("Reached %s\n", __func__);
166
167         if (floppy->failed_pc == pc)
168                 floppy->failed_pc = NULL;
169
170         if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
171             (pc->rq && blk_pc_request(pc->rq)))
172                 uptodate = 1; /* FIXME */
173         else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
174                 u8 *buf = pc->buf;
175
176                 if (!pc->error) {
177                         floppy->sense_key = buf[2] & 0x0F;
178                         floppy->asc = buf[12];
179                         floppy->ascq = buf[13];
180                         floppy->progress_indication = buf[15] & 0x80 ?
181                                 (u16)get_unaligned((u16 *)&buf[16]) : 0x10000;
182
183                         if (floppy->failed_pc)
184                                 debug_log("pc = %x, ", floppy->failed_pc->c[0]);
185
186                         debug_log("sense key = %x, asc = %x, ascq = %x\n",
187                                   floppy->sense_key, floppy->asc, floppy->ascq);
188                 } else
189                         printk(KERN_ERR "Error in REQUEST SENSE itself - "
190                                         "Aborting request!\n");
191         }
192
193         idefloppy_end_request(drive, uptodate, 0);
194 }
195
196 /* The usual interrupt handler called during a packet command. */
197 static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
198 {
199         return ide_pc_intr(drive, idefloppy_pc_intr);
200 }
201
202 /*
203  * What we have here is a classic case of a top half / bottom half interrupt
204  * service routine. In interrupt mode, the device sends an interrupt to signal
205  * that it is ready to receive a packet. However, we need to delay about 2-3
206  * ticks before issuing the packet or we gets in trouble.
207  */
208 static int idefloppy_transfer_pc(ide_drive_t *drive)
209 {
210         /* Send the actual packet */
211         drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
212
213         /* Timeout for the packet command */
214         return WAIT_FLOPPY_CMD;
215 }
216
217 /*
218  * Called as an interrupt (or directly). When the device says it's ready for a
219  * packet, we schedule the packet transfer to occur about 2-3 ticks later in
220  * transfer_pc.
221  */
222 static ide_startstop_t idefloppy_start_pc_transfer(ide_drive_t *drive)
223 {
224         idefloppy_floppy_t *floppy = drive->driver_data;
225         ide_expiry_t *expiry;
226         unsigned int timeout;
227
228         /*
229          * The following delay solves a problem with ATAPI Zip 100 drives
230          * where the Busy flag was apparently being deasserted before the
231          * unit was ready to receive data. This was happening on a
232          * 1200 MHz Athlon system. 10/26/01 25msec is too short,
233          * 40 and 50msec work well. idefloppy_pc_intr will not be actually
234          * used until after the packet is moved in about 50 msec.
235          */
236         if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
237                 timeout = floppy->ticks;
238                 expiry = &idefloppy_transfer_pc;
239         } else {
240                 timeout = WAIT_FLOPPY_CMD;
241                 expiry = NULL;
242         }
243
244         return ide_transfer_pc(drive, idefloppy_pc_intr, timeout, expiry);
245 }
246
247 static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
248                                     struct ide_atapi_pc *pc)
249 {
250         /* supress error messages resulting from Medium not present */
251         if (floppy->sense_key == 0x02 &&
252             floppy->asc       == 0x3a &&
253             floppy->ascq      == 0x00)
254                 return;
255
256         printk(KERN_ERR "ide-floppy: %s: I/O error, pc = %2x, key = %2x, "
257                         "asc = %2x, ascq = %2x\n",
258                         floppy->drive->name, pc->c[0], floppy->sense_key,
259                         floppy->asc, floppy->ascq);
260
261 }
262
263 static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
264                 struct ide_atapi_pc *pc)
265 {
266         idefloppy_floppy_t *floppy = drive->driver_data;
267
268         if (floppy->failed_pc == NULL &&
269             pc->c[0] != GPCMD_REQUEST_SENSE)
270                 floppy->failed_pc = pc;
271
272         /* Set the current packet command */
273         drive->pc = pc;
274
275         if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
276                 if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
277                         ide_floppy_report_error(floppy, pc);
278                 /* Giving up */
279                 pc->error = IDEFLOPPY_ERROR_GENERAL;
280
281                 floppy->failed_pc = NULL;
282                 drive->pc_callback(drive, 0);
283                 return ide_stopped;
284         }
285
286         debug_log("Retry number - %d\n", pc->retries);
287
288         pc->retries++;
289
290         return ide_issue_pc(drive, idefloppy_start_pc_transfer,
291                             WAIT_FLOPPY_CMD, NULL);
292 }
293
294 void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
295 {
296         ide_init_pc(pc);
297         pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
298         pc->c[7] = 255;
299         pc->c[8] = 255;
300         pc->req_xfer = 255;
301 }
302
303 /* A mode sense command is used to "sense" floppy parameters. */
304 void ide_floppy_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
305 {
306         u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */
307
308         ide_init_pc(pc);
309         pc->c[0] = GPCMD_MODE_SENSE_10;
310         pc->c[1] = 0;
311         pc->c[2] = page_code;
312
313         switch (page_code) {
314         case IDEFLOPPY_CAPABILITIES_PAGE:
315                 length += 12;
316                 break;
317         case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
318                 length += 32;
319                 break;
320         default:
321                 printk(KERN_ERR "ide-floppy: unsupported page code "
322                                 "in create_mode_sense_cmd\n");
323         }
324         put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
325         pc->req_xfer = length;
326 }
327
328 static void idefloppy_create_rw_cmd(idefloppy_floppy_t *floppy,
329                                     struct ide_atapi_pc *pc, struct request *rq,
330                                     unsigned long sector)
331 {
332         int block = sector / floppy->bs_factor;
333         int blocks = rq->nr_sectors / floppy->bs_factor;
334         int cmd = rq_data_dir(rq);
335
336         debug_log("create_rw10_cmd: block == %d, blocks == %d\n",
337                 block, blocks);
338
339         ide_init_pc(pc);
340         pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
341         put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
342         put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);
343
344         memcpy(rq->cmd, pc->c, 12);
345
346         pc->rq = rq;
347         pc->b_count = 0;
348         if (rq->cmd_flags & REQ_RW)
349                 pc->flags |= PC_FLAG_WRITING;
350         pc->buf = NULL;
351         pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
352         pc->flags |= PC_FLAG_DMA_OK;
353 }
354
355 static void idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy,
356                 struct ide_atapi_pc *pc, struct request *rq)
357 {
358         ide_init_pc(pc);
359         memcpy(pc->c, rq->cmd, sizeof(pc->c));
360         pc->rq = rq;
361         pc->b_count = 0;
362         if (rq->data_len && rq_data_dir(rq) == WRITE)
363                 pc->flags |= PC_FLAG_WRITING;
364         pc->buf = rq->data;
365         if (rq->bio)
366                 pc->flags |= PC_FLAG_DMA_OK;
367         /*
368          * possibly problematic, doesn't look like ide-floppy correctly
369          * handled scattered requests if dma fails...
370          */
371         pc->req_xfer = pc->buf_size = rq->data_len;
372 }
373
374 static ide_startstop_t idefloppy_do_request(ide_drive_t *drive,
375                 struct request *rq, sector_t block_s)
376 {
377         idefloppy_floppy_t *floppy = drive->driver_data;
378         ide_hwif_t *hwif = drive->hwif;
379         struct ide_atapi_pc *pc;
380         unsigned long block = (unsigned long)block_s;
381
382         debug_log("%s: dev: %s, cmd: 0x%x, cmd_type: %x, errors: %d\n",
383                   __func__, rq->rq_disk ? rq->rq_disk->disk_name : "?",
384                   rq->cmd[0], rq->cmd_type, rq->errors);
385
386         debug_log("%s: sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
387                   __func__, (long)rq->sector, rq->nr_sectors,
388                   rq->current_nr_sectors);
389
390         if (rq->errors >= ERROR_MAX) {
391                 if (floppy->failed_pc)
392                         ide_floppy_report_error(floppy, floppy->failed_pc);
393                 else
394                         printk(KERN_ERR "ide-floppy: %s: I/O error\n",
395                                 drive->name);
396                 idefloppy_end_request(drive, 0, 0);
397                 return ide_stopped;
398         }
399         if (blk_fs_request(rq)) {
400                 if (((long)rq->sector % floppy->bs_factor) ||
401                     (rq->nr_sectors % floppy->bs_factor)) {
402                         printk(KERN_ERR "%s: unsupported r/w request size\n",
403                                         drive->name);
404                         idefloppy_end_request(drive, 0, 0);
405                         return ide_stopped;
406                 }
407                 pc = &floppy->queued_pc;
408                 idefloppy_create_rw_cmd(floppy, pc, rq, block);
409         } else if (blk_special_request(rq)) {
410                 pc = (struct ide_atapi_pc *) rq->buffer;
411         } else if (blk_pc_request(rq)) {
412                 pc = &floppy->queued_pc;
413                 idefloppy_blockpc_cmd(floppy, pc, rq);
414         } else {
415                 blk_dump_rq_flags(rq,
416                         "ide-floppy: unsupported command in queue");
417                 idefloppy_end_request(drive, 0, 0);
418                 return ide_stopped;
419         }
420
421         ide_init_sg_cmd(drive, rq);
422         ide_map_sg(drive, rq);
423
424         pc->sg = hwif->sg_table;
425         pc->sg_cnt = hwif->sg_nents;
426
427         pc->rq = rq;
428
429         return idefloppy_issue_pc(drive, pc);
430 }
431
432 /*
433  * Look at the flexible disk page parameters. We ignore the CHS capacity
434  * parameters and use the LBA parameters instead.
435  */
436 static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive)
437 {
438         idefloppy_floppy_t *floppy = drive->driver_data;
439         struct gendisk *disk = floppy->disk;
440         struct ide_atapi_pc pc;
441         u8 *page;
442         int capacity, lba_capacity;
443         u16 transfer_rate, sector_size, cyls, rpm;
444         u8 heads, sectors;
445
446         ide_floppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);
447
448         if (ide_queue_pc_tail(drive, disk, &pc)) {
449                 printk(KERN_ERR "ide-floppy: Can't get flexible disk page"
450                                 " parameters\n");
451                 return 1;
452         }
453
454         if (pc.buf[3] & 0x80)
455                 drive->atapi_flags |= IDE_AFLAG_WP;
456         else
457                 drive->atapi_flags &= ~IDE_AFLAG_WP;
458
459         set_disk_ro(disk, !!(drive->atapi_flags & IDE_AFLAG_WP));
460
461         page = &pc.buf[8];
462
463         transfer_rate = be16_to_cpup((__be16 *)&pc.buf[8 + 2]);
464         sector_size   = be16_to_cpup((__be16 *)&pc.buf[8 + 6]);
465         cyls          = be16_to_cpup((__be16 *)&pc.buf[8 + 8]);
466         rpm           = be16_to_cpup((__be16 *)&pc.buf[8 + 28]);
467         heads         = pc.buf[8 + 4];
468         sectors       = pc.buf[8 + 5];
469
470         capacity = cyls * heads * sectors * sector_size;
471
472         if (memcmp(page, &floppy->flexible_disk_page, 32))
473                 printk(KERN_INFO "%s: %dkB, %d/%d/%d CHS, %d kBps, "
474                                 "%d sector size, %d rpm\n",
475                                 drive->name, capacity / 1024, cyls, heads,
476                                 sectors, transfer_rate / 8, sector_size, rpm);
477
478         memcpy(&floppy->flexible_disk_page, page, 32);
479         drive->bios_cyl = cyls;
480         drive->bios_head = heads;
481         drive->bios_sect = sectors;
482         lba_capacity = floppy->blocks * floppy->block_size;
483
484         if (capacity < lba_capacity) {
485                 printk(KERN_NOTICE "%s: The disk reports a capacity of %d "
486                         "bytes, but the drive only handles %d\n",
487                         drive->name, lba_capacity, capacity);
488                 floppy->blocks = floppy->block_size ?
489                         capacity / floppy->block_size : 0;
490         }
491         return 0;
492 }
493
494 /*
495  * Determine if a media is present in the floppy drive, and if so, its LBA
496  * capacity.
497  */
498 static int ide_floppy_get_capacity(ide_drive_t *drive)
499 {
500         idefloppy_floppy_t *floppy = drive->driver_data;
501         struct gendisk *disk = floppy->disk;
502         struct ide_atapi_pc pc;
503         u8 *cap_desc;
504         u8 header_len, desc_cnt;
505         int i, rc = 1, blocks, length;
506
507         drive->bios_cyl = 0;
508         drive->bios_head = drive->bios_sect = 0;
509         floppy->blocks = 0;
510         floppy->bs_factor = 1;
511         set_capacity(floppy->disk, 0);
512
513         ide_floppy_create_read_capacity_cmd(&pc);
514         if (ide_queue_pc_tail(drive, disk, &pc)) {
515                 printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
516                 return 1;
517         }
518         header_len = pc.buf[3];
519         cap_desc = &pc.buf[4];
520         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
521
522         for (i = 0; i < desc_cnt; i++) {
523                 unsigned int desc_start = 4 + i*8;
524
525                 blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
526                 length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
527
528                 debug_log("Descriptor %d: %dkB, %d blocks, %d sector size\n",
529                                 i, blocks * length / 1024, blocks, length);
530
531                 if (i)
532                         continue;
533                 /*
534                  * the code below is valid only for the 1st descriptor, ie i=0
535                  */
536
537                 switch (pc.buf[desc_start + 4] & 0x03) {
538                 /* Clik! drive returns this instead of CAPACITY_CURRENT */
539                 case CAPACITY_UNFORMATTED:
540                         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
541                                 /*
542                                  * If it is not a clik drive, break out
543                                  * (maintains previous driver behaviour)
544                                  */
545                                 break;
546                 case CAPACITY_CURRENT:
547                         /* Normal Zip/LS-120 disks */
548                         if (memcmp(cap_desc, &floppy->cap_desc, 8))
549                                 printk(KERN_INFO "%s: %dkB, %d blocks, %d "
550                                         "sector size\n", drive->name,
551                                         blocks * length / 1024, blocks, length);
552                         memcpy(&floppy->cap_desc, cap_desc, 8);
553
554                         if (!length || length % 512) {
555                                 printk(KERN_NOTICE "%s: %d bytes block size "
556                                         "not supported\n", drive->name, length);
557                         } else {
558                                 floppy->blocks = blocks;
559                                 floppy->block_size = length;
560                                 floppy->bs_factor = length / 512;
561                                 if (floppy->bs_factor != 1)
562                                         printk(KERN_NOTICE "%s: warning: non "
563                                                 "512 bytes block size not "
564                                                 "fully supported\n",
565                                                 drive->name);
566                                 rc = 0;
567                         }
568                         break;
569                 case CAPACITY_NO_CARTRIDGE:
570                         /*
571                          * This is a KERN_ERR so it appears on screen
572                          * for the user to see
573                          */
574                         printk(KERN_ERR "%s: No disk in drive\n", drive->name);
575                         break;
576                 case CAPACITY_INVALID:
577                         printk(KERN_ERR "%s: Invalid capacity for disk "
578                                 "in drive\n", drive->name);
579                         break;
580                 }
581                 debug_log("Descriptor 0 Code: %d\n",
582                           pc.buf[desc_start + 4] & 0x03);
583         }
584
585         /* Clik! disk does not support get_flexible_disk_page */
586         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
587                 (void) ide_floppy_get_flexible_disk_page(drive);
588
589         set_capacity(disk, floppy->blocks * floppy->bs_factor);
590
591         return rc;
592 }
593
594 static sector_t idefloppy_capacity(ide_drive_t *drive)
595 {
596         idefloppy_floppy_t *floppy = drive->driver_data;
597         unsigned long capacity = floppy->blocks * floppy->bs_factor;
598
599         return capacity;
600 }
601
602 #ifdef CONFIG_IDE_PROC_FS
603 ide_devset_rw_field(bios_cyl, bios_cyl);
604 ide_devset_rw_field(bios_head, bios_head);
605 ide_devset_rw_field(bios_sect, bios_sect);
606
607 static int get_ticks(ide_drive_t *drive)
608 {
609         idefloppy_floppy_t *floppy = drive->driver_data;
610         return floppy->ticks;
611 }
612
613 static int set_ticks(ide_drive_t *drive, int arg)
614 {
615         idefloppy_floppy_t *floppy = drive->driver_data;
616         floppy->ticks = arg;
617         return 0;
618 }
619
620 IDE_DEVSET(ticks, DS_SYNC, get_ticks, set_ticks);
621
622 static const struct ide_proc_devset idefloppy_settings[] = {
623         IDE_PROC_DEVSET(bios_cyl,  0, 1023),
624         IDE_PROC_DEVSET(bios_head, 0,  255),
625         IDE_PROC_DEVSET(bios_sect, 0,   63),
626         IDE_PROC_DEVSET(ticks,     0,  255),
627         { 0 },
628 };
629 #endif
630
631 static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
632 {
633         u16 *id = drive->id;
634         u8 gcw[2];
635
636         *((u16 *)&gcw) = id[ATA_ID_CONFIG];
637
638         drive->pc_callback       = ide_floppy_callback;
639         drive->pc_update_buffers = idefloppy_update_buffers;
640         drive->pc_io_buffers     = ide_io_buffers;
641
642         if (((gcw[0] & 0x60) >> 5) == 1)
643                 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
644         /*
645          * We used to check revisions here. At this point however I'm giving up.
646          * Just assume they are all broken, its easier.
647          *
648          * The actual reason for the workarounds was likely a driver bug after
649          * all rather than a firmware bug, and the workaround below used to hide
650          * it. It should be fixed as of version 1.9, but to be on the safe side
651          * we'll leave the limitation below for the 2.2.x tree.
652          */
653         if (!strncmp((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI", 20)) {
654                 drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
655                 /* This value will be visible in the /proc/ide/hdx/settings */
656                 floppy->ticks = IDEFLOPPY_TICKS_DELAY;
657                 blk_queue_max_sectors(drive->queue, 64);
658         }
659
660         /*
661          * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
662          * nasty clicking noises without it, so please don't remove this.
663          */
664         if (strncmp((char *)&id[ATA_ID_PROD], "IOMEGA Clik!", 11) == 0) {
665                 blk_queue_max_sectors(drive->queue, 64);
666                 drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
667                 /* IOMEGA Clik! drives do not support lock/unlock commands */
668                 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
669         }
670
671         (void) ide_floppy_get_capacity(drive);
672
673         ide_proc_register_driver(drive, floppy->driver);
674 }
675
676 static void ide_floppy_remove(ide_drive_t *drive)
677 {
678         idefloppy_floppy_t *floppy = drive->driver_data;
679         struct gendisk *g = floppy->disk;
680
681         ide_proc_unregister_driver(drive, floppy->driver);
682
683         del_gendisk(g);
684
685         ide_floppy_put(floppy);
686 }
687
688 static void idefloppy_cleanup_obj(struct kref *kref)
689 {
690         struct ide_floppy_obj *floppy = to_ide_floppy(kref);
691         ide_drive_t *drive = floppy->drive;
692         struct gendisk *g = floppy->disk;
693
694         drive->driver_data = NULL;
695         g->private_data = NULL;
696         put_disk(g);
697         kfree(floppy);
698 }
699
700 #ifdef CONFIG_IDE_PROC_FS
701 static int proc_idefloppy_read_capacity(char *page, char **start, off_t off,
702                 int count, int *eof, void *data)
703 {
704         ide_drive_t*drive = (ide_drive_t *)data;
705         int len;
706
707         len = sprintf(page, "%llu\n", (long long)idefloppy_capacity(drive));
708         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
709 }
710
711 static ide_proc_entry_t idefloppy_proc[] = {
712         { "capacity",   S_IFREG|S_IRUGO, proc_idefloppy_read_capacity,  NULL },
713         { "geometry",   S_IFREG|S_IRUGO, proc_ide_read_geometry,        NULL },
714         { NULL, 0, NULL, NULL }
715 };
716 #endif  /* CONFIG_IDE_PROC_FS */
717
718 static int ide_floppy_probe(ide_drive_t *);
719
720 static ide_driver_t idefloppy_driver = {
721         .gen_driver = {
722                 .owner          = THIS_MODULE,
723                 .name           = "ide-floppy",
724                 .bus            = &ide_bus_type,
725         },
726         .probe                  = ide_floppy_probe,
727         .remove                 = ide_floppy_remove,
728         .version                = IDEFLOPPY_VERSION,
729         .media                  = ide_floppy,
730         .do_request             = idefloppy_do_request,
731         .end_request            = idefloppy_end_request,
732         .error                  = __ide_error,
733 #ifdef CONFIG_IDE_PROC_FS
734         .proc                   = idefloppy_proc,
735         .settings               = idefloppy_settings,
736 #endif
737 };
738
739 static int idefloppy_open(struct inode *inode, struct file *filp)
740 {
741         struct gendisk *disk = inode->i_bdev->bd_disk;
742         struct ide_floppy_obj *floppy;
743         ide_drive_t *drive;
744         int ret = 0;
745
746         debug_log("Reached %s\n", __func__);
747
748         floppy = ide_floppy_get(disk);
749         if (!floppy)
750                 return -ENXIO;
751
752         drive = floppy->drive;
753
754         floppy->openers++;
755
756         if (floppy->openers == 1) {
757                 drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
758                 /* Just in case */
759
760                 if (ide_do_test_unit_ready(drive, disk))
761                         ide_do_start_stop(drive, disk, 1);
762
763                 if (ide_floppy_get_capacity(drive)
764                    && (filp->f_flags & O_NDELAY) == 0
765                     /*
766                      * Allow O_NDELAY to open a drive without a disk, or with an
767                      * unreadable disk, so that we can get the format capacity
768                      * of the drive or begin the format - Sam
769                      */
770                     ) {
771                         ret = -EIO;
772                         goto out_put_floppy;
773                 }
774
775                 if ((drive->atapi_flags & IDE_AFLAG_WP) && (filp->f_mode & 2)) {
776                         ret = -EROFS;
777                         goto out_put_floppy;
778                 }
779
780                 drive->atapi_flags |= IDE_AFLAG_MEDIA_CHANGED;
781                 ide_set_media_lock(drive, disk, 1);
782                 check_disk_change(inode->i_bdev);
783         } else if (drive->atapi_flags & IDE_AFLAG_FORMAT_IN_PROGRESS) {
784                 ret = -EBUSY;
785                 goto out_put_floppy;
786         }
787         return 0;
788
789 out_put_floppy:
790         floppy->openers--;
791         ide_floppy_put(floppy);
792         return ret;
793 }
794
795 static int idefloppy_release(struct inode *inode, struct file *filp)
796 {
797         struct gendisk *disk = inode->i_bdev->bd_disk;
798         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
799         ide_drive_t *drive = floppy->drive;
800
801         debug_log("Reached %s\n", __func__);
802
803         if (floppy->openers == 1) {
804                 ide_set_media_lock(drive, disk, 0);
805                 drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
806         }
807
808         floppy->openers--;
809
810         ide_floppy_put(floppy);
811
812         return 0;
813 }
814
815 static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
816 {
817         struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
818         ide_drive_t *drive = floppy->drive;
819
820         geo->heads = drive->bios_head;
821         geo->sectors = drive->bios_sect;
822         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
823         return 0;
824 }
825
826 static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
827                                unsigned long arg, unsigned int cmd)
828 {
829         idefloppy_floppy_t *floppy = drive->driver_data;
830         struct gendisk *disk = floppy->disk;
831         int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
832
833         if (floppy->openers > 1)
834                 return -EBUSY;
835
836         ide_set_media_lock(drive, disk, prevent);
837
838         if (cmd == CDROMEJECT)
839                 ide_do_start_stop(drive, disk, 2);
840
841         return 0;
842 }
843
844 static int idefloppy_ioctl(struct inode *inode, struct file *file,
845                         unsigned int cmd, unsigned long arg)
846 {
847         struct block_device *bdev = inode->i_bdev;
848         struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
849         ide_drive_t *drive = floppy->drive;
850         struct ide_atapi_pc pc;
851         void __user *argp = (void __user *)arg;
852         int err;
853
854         if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR)
855                 return ide_floppy_lockdoor(drive, &pc, arg, cmd);
856
857         err = ide_floppy_format_ioctl(drive, file, cmd, argp);
858         if (err != -ENOTTY)
859                 return err;
860
861         /*
862          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
863          * and CDROM_SEND_PACKET (legacy) ioctls
864          */
865         if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
866                 err = scsi_cmd_ioctl(file, bdev->bd_disk->queue,
867                                         bdev->bd_disk, cmd, argp);
868
869         if (err == -ENOTTY)
870                 err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
871
872         return err;
873 }
874
875 static int idefloppy_media_changed(struct gendisk *disk)
876 {
877         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
878         ide_drive_t *drive = floppy->drive;
879         int ret;
880
881         /* do not scan partitions twice if this is a removable device */
882         if (drive->attach) {
883                 drive->attach = 0;
884                 return 0;
885         }
886         ret = !!(drive->atapi_flags & IDE_AFLAG_MEDIA_CHANGED);
887         drive->atapi_flags &= ~IDE_AFLAG_MEDIA_CHANGED;
888         return ret;
889 }
890
891 static int idefloppy_revalidate_disk(struct gendisk *disk)
892 {
893         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
894         set_capacity(disk, idefloppy_capacity(floppy->drive));
895         return 0;
896 }
897
898 static struct block_device_operations idefloppy_ops = {
899         .owner                  = THIS_MODULE,
900         .open                   = idefloppy_open,
901         .release                = idefloppy_release,
902         .ioctl                  = idefloppy_ioctl,
903         .getgeo                 = idefloppy_getgeo,
904         .media_changed          = idefloppy_media_changed,
905         .revalidate_disk        = idefloppy_revalidate_disk
906 };
907
908 static int ide_floppy_probe(ide_drive_t *drive)
909 {
910         idefloppy_floppy_t *floppy;
911         struct gendisk *g;
912
913         if (!strstr("ide-floppy", drive->driver_req))
914                 goto failed;
915
916         if (drive->media != ide_floppy)
917                 goto failed;
918
919         if (!ide_check_atapi_device(drive, DRV_NAME)) {
920                 printk(KERN_ERR "ide-floppy: %s: not supported by this version"
921                                 " of ide-floppy\n", drive->name);
922                 goto failed;
923         }
924         floppy = kzalloc(sizeof(idefloppy_floppy_t), GFP_KERNEL);
925         if (!floppy) {
926                 printk(KERN_ERR "ide-floppy: %s: Can't allocate a floppy"
927                                 " structure\n", drive->name);
928                 goto failed;
929         }
930
931         g = alloc_disk(1 << PARTN_BITS);
932         if (!g)
933                 goto out_free_floppy;
934
935         ide_init_disk(g, drive);
936
937         kref_init(&floppy->kref);
938
939         floppy->drive = drive;
940         floppy->driver = &idefloppy_driver;
941         floppy->disk = g;
942
943         g->private_data = &floppy->driver;
944
945         drive->driver_data = floppy;
946
947         idefloppy_setup(drive, floppy);
948
949         g->minors = 1 << PARTN_BITS;
950         g->driverfs_dev = &drive->gendev;
951         g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
952         g->fops = &idefloppy_ops;
953         drive->attach = 1;
954         add_disk(g);
955         return 0;
956
957 out_free_floppy:
958         kfree(floppy);
959 failed:
960         return -ENODEV;
961 }
962
963 static void __exit idefloppy_exit(void)
964 {
965         driver_unregister(&idefloppy_driver.gen_driver);
966 }
967
968 static int __init idefloppy_init(void)
969 {
970         printk("ide-floppy driver " IDEFLOPPY_VERSION "\n");
971         return driver_register(&idefloppy_driver.gen_driver);
972 }
973
974 MODULE_ALIAS("ide:*m-floppy*");
975 MODULE_ALIAS("ide-floppy");
976 module_init(idefloppy_init);
977 module_exit(idefloppy_exit);
978 MODULE_LICENSE("GPL");
979 MODULE_DESCRIPTION("ATAPI FLOPPY Driver");
980