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ide-tape: remove pipelined mode tape control flags
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / ide / ide-tape.c
CommitLineData
1da177e4 1/*
5ce78af4
BP		 2 * IDE ATAPI streaming tape driver.
3 *
59bca8cc
BZ		 4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
1da177e4 6 *
1da177e4
LT		 7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
10 *
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
1da177e4 13 *
5ce78af4
BP		 14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
1da177e4
LT		 16 */
17
dfe79936 18#define IDETAPE_VERSION "1.20"
1da177e4 19
1da177e4
LT		 20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/string.h>
23#include <linux/kernel.h>
24#include <linux/delay.h>
25#include <linux/timer.h>
26#include <linux/mm.h>
27#include <linux/interrupt.h>
9bae1ff3 28#include <linux/jiffies.h>
1da177e4 29#include <linux/major.h>
1da177e4
LT		 30#include <linux/errno.h>
31#include <linux/genhd.h>
32#include <linux/slab.h>
33#include <linux/pci.h>
34#include <linux/ide.h>
35#include <linux/smp_lock.h>
36#include <linux/completion.h>
37#include <linux/bitops.h>
cf8b8975 38#include <linux/mutex.h>
90699ce2 39#include <scsi/scsi.h>
1da177e4
LT		 40
41#include <asm/byteorder.h>
c837cfa5
BP		 42#include <linux/irq.h>
43#include <linux/uaccess.h>
44#include <linux/io.h>
1da177e4 45#include <asm/unaligned.h>
1da177e4
LT		 46#include <linux/mtio.h>
47
8004a8c9
BP		 48enum {
49 /* output errors only */
50 DBG_ERR = (1 << 0),
51 /* output all sense key/asc */
52 DBG_SENSE = (1 << 1),
53 /* info regarding all chrdev-related procedures */
54 DBG_CHRDEV = (1 << 2),
55 /* all remaining procedures */
56 DBG_PROCS = (1 << 3),
57 /* buffer alloc info (pc_stack & rq_stack) */
58 DBG_PCRQ_STACK = (1 << 4),
59};
60
61/* define to see debug info */
62#define IDETAPE_DEBUG_LOG 0
63
64#if IDETAPE_DEBUG_LOG
65#define debug_log(lvl, fmt, args...) \
66{ \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
69}
70#else
71#define debug_log(lvl, fmt, args...) do {} while (0)
72#endif
73
1da177e4
LT		 74/**************************** Tunable parameters *****************************/
75
76
77/*
3c98bf34 78 * Pipelined mode parameters.
1da177e4 79 *
3c98bf34
BP		 80 * We try to use the minimum number of stages which is enough to keep the tape
81 * constantly streaming. To accomplish that, we implement a feedback loop around
82 * the maximum number of stages:
1da177e4 83 *
3c98bf34
BP		 84 * We start from MIN maximum stages (we will not even use MIN stages if we don't
85 * need them), increment it by RATE*(MAX-MIN) whenever we sense that the
86 * pipeline is empty, until we reach the optimum value or until we reach MAX.
1da177e4
LT		 87 */
88#define IDETAPE_MIN_PIPELINE_STAGES 1
89#define IDETAPE_MAX_PIPELINE_STAGES 400
90#define IDETAPE_INCREASE_STAGES_RATE 20
91
1da177e4 92/*
3c98bf34
BP		 93 * After each failed packet command we issue a request sense command and retry
94 * the packet command IDETAPE_MAX_PC_RETRIES times.
1da177e4 95 *
3c98bf34 96 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
1da177e4
LT		 97 */
98#define IDETAPE_MAX_PC_RETRIES 3
99
100/*
3c98bf34
BP		 101 * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE
102 * bytes. This is used for several packet commands (Not for READ/WRITE commands)
1da177e4
LT		 103 */
104#define IDETAPE_PC_BUFFER_SIZE 256
105
106/*
107 * In various places in the driver, we need to allocate storage
108 * for packet commands and requests, which will remain valid while
109 * we leave the driver to wait for an interrupt or a timeout event.
110 */
111#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
112
113/*
114 * Some drives (for example, Seagate STT3401A Travan) require a very long
115 * timeout, because they don't return an interrupt or clear their busy bit
116 * until after the command completes (even retension commands).
117 */
118#define IDETAPE_WAIT_CMD (900*HZ)
119
120/*
3c98bf34
BP		 121 * The following parameter is used to select the point in the internal tape fifo
122 * in which we will start to refill the buffer. Decreasing the following
123 * parameter will improve the system's latency and interactive response, while
124 * using a high value might improve system throughput.
1da177e4 125 */
3c98bf34 126#define IDETAPE_FIFO_THRESHOLD 2
1da177e4
LT		 127
128/*
3c98bf34 129 * DSC polling parameters.
1da177e4 130 *
3c98bf34
BP		 131 * Polling for DSC (a single bit in the status register) is a very important
132 * function in ide-tape. There are two cases in which we poll for DSC:
1da177e4 133 *
3c98bf34
BP		 134 * 1. Before a read/write packet command, to ensure that we can transfer data
135 * from/to the tape's data buffers, without causing an actual media access.
136 * In case the tape is not ready yet, we take out our request from the device
137 * request queue, so that ide.c could service requests from the other device
138 * on the same interface in the meantime.
1da177e4 139 *
3c98bf34
BP		 140 * 2. After the successful initialization of a "media access packet command",
141 * which is a command that can take a long time to complete (the interval can
142 * range from several seconds to even an hour). Again, we postpone our request
143 * in the middle to free the bus for the other device. The polling frequency
144 * here should be lower than the read/write frequency since those media access
145 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
146 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
147 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
1da177e4 148 *
3c98bf34
BP		 149 * We also set a timeout for the timer, in case something goes wrong. The
150 * timeout should be longer then the maximum execution time of a tape operation.
1da177e4 151 */
3c98bf34
BP		 152
153/* DSC timings. */
1da177e4
LT		 154#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
155#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
156#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
157#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
158#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
159#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
160#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
161
162/*************************** End of tunable parameters ***********************/
163
3c98bf34 164/* Read/Write error simulation */
1da177e4
LT		 165#define SIMULATE_ERRORS 0
166
54abf37e
BP		 167/* tape directions */
168enum {
169 IDETAPE_DIR_NONE = (1 << 0),
170 IDETAPE_DIR_READ = (1 << 1),
171 IDETAPE_DIR_WRITE = (1 << 2),
172};
1da177e4
LT		 173
174struct idetape_bh {
ab057968 175 u32 b_size;
1da177e4
LT		 176 atomic_t b_count;
177 struct idetape_bh *b_reqnext;
178 char *b_data;
179};
180
03056b90
BP		 181/* Tape door status */
182#define DOOR_UNLOCKED 0
183#define DOOR_LOCKED 1
184#define DOOR_EXPLICITLY_LOCKED 2
185
186/* Some defines for the SPACE command */
187#define IDETAPE_SPACE_OVER_FILEMARK 1
188#define IDETAPE_SPACE_TO_EOD 3
189
190/* Some defines for the LOAD UNLOAD command */
191#define IDETAPE_LU_LOAD_MASK 1
192#define IDETAPE_LU_RETENSION_MASK 2
193#define IDETAPE_LU_EOT_MASK 4
194
195/*
196 * Special requests for our block device strategy routine.
197 *
198 * In order to service a character device command, we add special requests to
199 * the tail of our block device request queue and wait for their completion.
200 */
201
202enum {
203 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
204 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
205 REQ_IDETAPE_READ = (1 << 2),
206 REQ_IDETAPE_WRITE = (1 << 3),
207};
208
209/* Error codes returned in rq->errors to the higher part of the driver. */
210#define IDETAPE_ERROR_GENERAL 101
211#define IDETAPE_ERROR_FILEMARK 102
212#define IDETAPE_ERROR_EOD 103
213
214/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
215#define IDETAPE_BLOCK_DESCRIPTOR 0
216#define IDETAPE_CAPABILITIES_PAGE 0x2a
217
346331f8
BP		 218/* Tape flag bits values. */
219enum {
220 IDETAPE_FLAG_IGNORE_DSC = (1 << 0),
221 /* 0 When the tape position is unknown */
222 IDETAPE_FLAG_ADDRESS_VALID = (1 << 1),
223 /* Device already opened */
42d54689 224 IDETAPE_FLAG_BUSY = (1 << 2),
346331f8 225 /* Attempt to auto-detect the current user block size */
42d54689 226 IDETAPE_FLAG_DETECT_BS = (1 << 3),
346331f8 227 /* Currently on a filemark */
42d54689 228 IDETAPE_FLAG_FILEMARK = (1 << 4),
346331f8 229 /* DRQ interrupt device */
42d54689 230 IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 5),
346331f8 231 /* 0 = no tape is loaded, so we don't rewind after ejecting */
42d54689 232 IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 6),
346331f8
BP		 233};
234
3c98bf34 235/* A pipeline stage. */
1da177e4
LT		 236typedef struct idetape_stage_s {
237 struct request rq; /* The corresponding request */
238 struct idetape_bh *bh; /* The data buffers */
239 struct idetape_stage_s *next; /* Pointer to the next stage */
240} idetape_stage_t;
241
1da177e4 242/*
3c98bf34
BP		 243 * Most of our global data which we need to save even as we leave the driver due
244 * to an interrupt or a timer event is stored in the struct defined below.
1da177e4
LT		 245 */
246typedef struct ide_tape_obj {
247 ide_drive_t *drive;
248 ide_driver_t *driver;
249 struct gendisk *disk;
250 struct kref kref;
251
252 /*
253 * Since a typical character device operation requires more
254 * than one packet command, we provide here enough memory
255 * for the maximum of interconnected packet commands.
256 * The packet commands are stored in the circular array pc_stack.
257 * pc_stack_index points to the last used entry, and warps around
258 * to the start when we get to the last array entry.
259 *
260 * pc points to the current processed packet command.
261 *
262 * failed_pc points to the last failed packet command, or contains
263 * NULL if we do not need to retry any packet command. This is
264 * required since an additional packet command is needed before the
265 * retry, to get detailed information on what went wrong.
266 */
267 /* Current packet command */
d236d74c 268 struct ide_atapi_pc *pc;
1da177e4 269 /* Last failed packet command */
d236d74c 270 struct ide_atapi_pc *failed_pc;
1da177e4 271 /* Packet command stack */
d236d74c 272 struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK];
1da177e4
LT		 273 /* Next free packet command storage space */
274 int pc_stack_index;
275 struct request rq_stack[IDETAPE_PC_STACK];
276 /* We implement a circular array */
277 int rq_stack_index;
278
279 /*
3c98bf34 280 * DSC polling variables.
1da177e4 281 *
3c98bf34
BP		 282 * While polling for DSC we use postponed_rq to postpone the current
283 * request so that ide.c will be able to service pending requests on the
284 * other device. Note that at most we will have only one DSC (usually
285 * data transfer) request in the device request queue. Additional
286 * requests can be queued in our internal pipeline, but they will be
287 * visible to ide.c only one at a time.
1da177e4
LT		 288 */
289 struct request *postponed_rq;
290 /* The time in which we started polling for DSC */
291 unsigned long dsc_polling_start;
292 /* Timer used to poll for dsc */
293 struct timer_list dsc_timer;
294 /* Read/Write dsc polling frequency */
54bb2074
BP		 295 unsigned long best_dsc_rw_freq;
296 unsigned long dsc_poll_freq;
1da177e4
LT		 297 unsigned long dsc_timeout;
298
3c98bf34 299 /* Read position information */
1da177e4
LT		 300 u8 partition;
301 /* Current block */
54bb2074 302 unsigned int first_frame;
1da177e4 303
3c98bf34 304 /* Last error information */
1da177e4
LT		 305 u8 sense_key, asc, ascq;
306
3c98bf34 307 /* Character device operation */
1da177e4
LT		 308 unsigned int minor;
309 /* device name */
310 char name[4];
311 /* Current character device data transfer direction */
54abf37e 312 u8 chrdev_dir;
1da177e4 313
54bb2074
BP		 314 /* tape block size, usually 512 or 1024 bytes */
315 unsigned short blk_size;
1da177e4 316 int user_bs_factor;
b6422013 317
1da177e4 318 /* Copy of the tape's Capabilities and Mechanical Page */
b6422013 319 u8 caps[20];
1da177e4
LT		 320
321 /*
3c98bf34 322 * Active data transfer request parameters.
1da177e4 323 *
3c98bf34
BP		 324 * At most, there is only one ide-tape originated data transfer request
325 * in the device request queue. This allows ide.c to easily service
326 * requests from the other device when we postpone our active request.
327 * In the pipelined operation mode, we use our internal pipeline
328 * structure to hold more data requests. The data buffer size is chosen
329 * based on the tape's recommendation.
1da177e4 330 */
3c98bf34 331 /* ptr to the request which is waiting in the device request queue */
54bb2074 332 struct request *active_data_rq;
3c98bf34 333 /* Data buffer size chosen based on the tape's recommendation */
1da177e4
LT		 334 int stage_size;
335 idetape_stage_t *merge_stage;
336 int merge_stage_size;
337 struct idetape_bh *bh;
338 char *b_data;
339 int b_count;
3c98bf34 340
1da177e4 341 /*
3c98bf34 342 * Pipeline parameters.
1da177e4 343 *
3c98bf34
BP		 344 * To accomplish non-pipelined mode, we simply set the following
345 * variables to zero (or NULL, where appropriate).
1da177e4
LT		 346 */
347 /* Number of currently used stages */
348 int nr_stages;
349 /* Number of pending stages */
350 int nr_pending_stages;
351 /* We will not allocate more than this number of stages */
352 int max_stages, min_pipeline, max_pipeline;
353 /* The first stage which will be removed from the pipeline */
354 idetape_stage_t *first_stage;
355 /* The currently active stage */
356 idetape_stage_t *active_stage;
357 /* Will be serviced after the currently active request */
358 idetape_stage_t *next_stage;
359 /* New requests will be added to the pipeline here */
360 idetape_stage_t *last_stage;
1da177e4
LT		 361 int pages_per_stage;
362 /* Wasted space in each stage */
363 int excess_bh_size;
364
365 /* Status/Action flags: long for set_bit */
366 unsigned long flags;
367 /* protects the ide-tape queue */
54bb2074 368 spinlock_t lock;
1da177e4 369
3c98bf34 370 /* Measures average tape speed */
1da177e4
LT		 371 unsigned long avg_time;
372 int avg_size;
373 int avg_speed;
374
1da177e4
LT		 375 /* the door is currently locked */
376 int door_locked;
377 /* the tape hardware is write protected */
378 char drv_write_prot;
379 /* the tape is write protected (hardware or opened as read-only) */
380 char write_prot;
381
382 /*
3c98bf34
BP		 383 * Limit the number of times a request can be postponed, to avoid an
384 * infinite postpone deadlock.
1da177e4 385 */
1da177e4
LT		 386 int postpone_cnt;
387
3c98bf34 388 /* Speed control at the tape buffers input/output */
1da177e4
LT		 389 unsigned long insert_time;
390 int insert_size;
391 int insert_speed;
1da177e4
LT		 392 int measure_insert_time;
393
8004a8c9 394 u32 debug_mask;
1da177e4
LT		 395} idetape_tape_t;
396
cf8b8975 397static DEFINE_MUTEX(idetape_ref_mutex);
1da177e4 398
d5dee80a
WD		 399static struct class *idetape_sysfs_class;
400
1da177e4
LT		 401#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
402
403#define ide_tape_g(disk) \
404 container_of((disk)->private_data, struct ide_tape_obj, driver)
405
406static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
407{
408 struct ide_tape_obj *tape = NULL;
409
cf8b8975 410 mutex_lock(&idetape_ref_mutex);
1da177e4
LT		 411 tape = ide_tape_g(disk);
412 if (tape)
413 kref_get(&tape->kref);
cf8b8975 414 mutex_unlock(&idetape_ref_mutex);
1da177e4
LT		 415 return tape;
416}
417
418static void ide_tape_release(struct kref *);
419
420static void ide_tape_put(struct ide_tape_obj *tape)
421{
cf8b8975 422 mutex_lock(&idetape_ref_mutex);
1da177e4 423 kref_put(&tape->kref, ide_tape_release);
cf8b8975 424 mutex_unlock(&idetape_ref_mutex);
1da177e4
LT		 425}
426
1da177e4 427/*
3c98bf34
BP		 428 * The variables below are used for the character device interface. Additional
429 * state variables are defined in our ide_drive_t structure.
1da177e4 430 */
5a04cfa9 431static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
1da177e4
LT		 432
433#define ide_tape_f(file) ((file)->private_data)
434
435static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
436{
437 struct ide_tape_obj *tape = NULL;
438
cf8b8975 439 mutex_lock(&idetape_ref_mutex);
1da177e4
LT		 440 tape = idetape_devs[i];
441 if (tape)
442 kref_get(&tape->kref);
cf8b8975 443 mutex_unlock(&idetape_ref_mutex);
1da177e4
LT		 444 return tape;
445}
446
d236d74c 447static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
5a04cfa9 448 unsigned int bcount)
1da177e4
LT		 449{
450 struct idetape_bh *bh = pc->bh;
451 int count;
452
453 while (bcount) {
1da177e4
LT		 454 if (bh == NULL) {
455 printk(KERN_ERR "ide-tape: bh == NULL in "
456 "idetape_input_buffers\n");
7616c0ad 457 ide_atapi_discard_data(drive, bcount);
1da177e4
LT		 458 return;
459 }
5a04cfa9
BP		 460 count = min(
461 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
462 bcount);
463 HWIF(drive)->atapi_input_bytes(drive, bh->b_data +
464 atomic_read(&bh->b_count), count);
1da177e4
LT		 465 bcount -= count;
466 atomic_add(count, &bh->b_count);
467 if (atomic_read(&bh->b_count) == bh->b_size) {
468 bh = bh->b_reqnext;
469 if (bh)
470 atomic_set(&bh->b_count, 0);
471 }
472 }
473 pc->bh = bh;
474}
475
d236d74c 476static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
5a04cfa9 477 unsigned int bcount)
1da177e4
LT		 478{
479 struct idetape_bh *bh = pc->bh;
480 int count;
481
482 while (bcount) {
1da177e4 483 if (bh == NULL) {
5a04cfa9
BP		 484 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
485 __func__);
1da177e4
LT		 486 return;
487 }
1da177e4
LT		 488 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
489 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
490 bcount -= count;
491 pc->b_data += count;
492 pc->b_count -= count;
493 if (!pc->b_count) {
5a04cfa9
BP		 494 bh = bh->b_reqnext;
495 pc->bh = bh;
1da177e4
LT		 496 if (bh) {
497 pc->b_data = bh->b_data;
498 pc->b_count = atomic_read(&bh->b_count);
499 }
500 }
501 }
502}
503
d236d74c 504static void idetape_update_buffers(struct ide_atapi_pc *pc)
1da177e4
LT		 505{
506 struct idetape_bh *bh = pc->bh;
507 int count;
d236d74c 508 unsigned int bcount = pc->xferred;
1da177e4 509
346331f8 510 if (pc->flags & PC_FLAG_WRITING)
1da177e4
LT		 511 return;
512 while (bcount) {
1da177e4 513 if (bh == NULL) {
5a04cfa9
BP		 514 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
515 __func__);
1da177e4
LT		 516 return;
517 }
1da177e4
LT		 518 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
519 atomic_set(&bh->b_count, count);
520 if (atomic_read(&bh->b_count) == bh->b_size)
521 bh = bh->b_reqnext;
522 bcount -= count;
523 }
524 pc->bh = bh;
525}
526
527/*
528 * idetape_next_pc_storage returns a pointer to a place in which we can
529 * safely store a packet command, even though we intend to leave the
530 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
531 * commands is allocated at initialization time.
532 */
d236d74c 533static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive)
1da177e4
LT		 534{
535 idetape_tape_t *tape = drive->driver_data;
536
8004a8c9
BP		 537 debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index);
538
1da177e4 539 if (tape->pc_stack_index == IDETAPE_PC_STACK)
5a04cfa9 540 tape->pc_stack_index = 0;
1da177e4
LT		 541 return (&tape->pc_stack[tape->pc_stack_index++]);
542}
543
544/*
545 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
546 * Since we queue packet commands in the request queue, we need to
547 * allocate a request, along with the allocation of a packet command.
548 */
5a04cfa9 549
1da177e4
LT		 550/**************************************************************
551 * *
552 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
553 * followed later on by kfree(). -ml *
554 * *
555 **************************************************************/
5a04cfa9
BP		 556
557static struct request *idetape_next_rq_storage(ide_drive_t *drive)
1da177e4
LT		 558{
559 idetape_tape_t *tape = drive->driver_data;
560
8004a8c9
BP		 561 debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index);
562
1da177e4 563 if (tape->rq_stack_index == IDETAPE_PC_STACK)
5a04cfa9 564 tape->rq_stack_index = 0;
1da177e4
LT		 565 return (&tape->rq_stack[tape->rq_stack_index++]);
566}
567
d236d74c 568static void idetape_init_pc(struct ide_atapi_pc *pc)
1da177e4
LT		 569{
570 memset(pc->c, 0, 12);
571 pc->retries = 0;
572 pc->flags = 0;
d236d74c
BP		 573 pc->req_xfer = 0;
574 pc->buf = pc->pc_buf;
575 pc->buf_size = IDETAPE_PC_BUFFER_SIZE;
1da177e4
LT		 576 pc->bh = NULL;
577 pc->b_data = NULL;
578}
579
580/*
1b5db434
BP		 581 * called on each failed packet command retry to analyze the request sense. We
582 * currently do not utilize this information.
1da177e4 583 */
1b5db434 584static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
1da177e4
LT		 585{
586 idetape_tape_t *tape = drive->driver_data;
d236d74c 587 struct ide_atapi_pc *pc = tape->failed_pc;
1da177e4 588
1b5db434
BP		 589 tape->sense_key = sense[2] & 0xF;
590 tape->asc = sense[12];
591 tape->ascq = sense[13];
8004a8c9
BP		 592
593 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
594 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
1da177e4 595
d236d74c 596 /* Correct pc->xferred by asking the tape. */
346331f8 597 if (pc->flags & PC_FLAG_DMA_ERROR) {
d236d74c 598 pc->xferred = pc->req_xfer -
54bb2074 599 tape->blk_size *
860ff5ec 600 be32_to_cpu(get_unaligned((u32 *)&sense[3]));
1da177e4
LT		 601 idetape_update_buffers(pc);
602 }
603
604 /*
605 * If error was the result of a zero-length read or write command,
606 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
607 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
608 */
90699ce2 609 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
1b5db434
BP		 610 /* length == 0 */
611 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
612 if (tape->sense_key == 5) {
1da177e4
LT		 613 /* don't report an error, everything's ok */
614 pc->error = 0;
615 /* don't retry read/write */
346331f8 616 pc->flags |= PC_FLAG_ABORT;
1da177e4
LT		 617 }
618 }
90699ce2 619 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
1da177e4 620 pc->error = IDETAPE_ERROR_FILEMARK;
346331f8 621 pc->flags |= PC_FLAG_ABORT;
1da177e4 622 }
90699ce2 623 if (pc->c[0] == WRITE_6) {
1b5db434
BP		 624 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
625 && tape->asc == 0x0 && tape->ascq == 0x2)) {
1da177e4 626 pc->error = IDETAPE_ERROR_EOD;
346331f8 627 pc->flags |= PC_FLAG_ABORT;
1da177e4
LT		 628 }
629 }
90699ce2 630 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
1b5db434 631 if (tape->sense_key == 8) {
1da177e4 632 pc->error = IDETAPE_ERROR_EOD;
346331f8 633 pc->flags |= PC_FLAG_ABORT;
1da177e4 634 }
346331f8 635 if (!(pc->flags & PC_FLAG_ABORT) &&
d236d74c 636 pc->xferred)
1da177e4
LT		 637 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
638 }
639}
640
3c98bf34 641/* Free a stage along with its related buffers completely. */
5a04cfa9 642static void __idetape_kfree_stage(idetape_stage_t *stage)
1da177e4
LT		 643{
644 struct idetape_bh *prev_bh, *bh = stage->bh;
645 int size;
646
647 while (bh != NULL) {
648 if (bh->b_data != NULL) {
649 size = (int) bh->b_size;
650 while (size > 0) {
651 free_page((unsigned long) bh->b_data);
652 size -= PAGE_SIZE;
653 bh->b_data += PAGE_SIZE;
654 }
655 }
656 prev_bh = bh;
657 bh = bh->b_reqnext;
658 kfree(prev_bh);
659 }
660 kfree(stage);
661}
662
1da177e4 663/*
3c98bf34
BP		 664 * Finish servicing a request and insert a pending pipeline request into the
665 * main device queue.
1da177e4
LT		 666 */
667static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
668{
669 struct request *rq = HWGROUP(drive)->rq;
670 idetape_tape_t *tape = drive->driver_data;
671 unsigned long flags;
672 int error;
1da177e4 673
8004a8c9 674 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1da177e4
LT		 675
676 switch (uptodate) {
5a04cfa9
BP		 677 case 0: error = IDETAPE_ERROR_GENERAL; break;
678 case 1: error = 0; break;
679 default: error = uptodate;
1da177e4
LT		 680 }
681 rq->errors = error;
682 if (error)
683 tape->failed_pc = NULL;
684
3687221f
BZ		 685 if (!blk_special_request(rq)) {
686 ide_end_request(drive, uptodate, nr_sects);
687 return 0;
688 }
689
54bb2074 690 spin_lock_irqsave(&tape->lock, flags);
1da177e4 691
1da177e4 692 ide_end_drive_cmd(drive, 0, 0);
1da177e4 693
54bb2074 694 spin_unlock_irqrestore(&tape->lock, flags);
1da177e4
LT		 695 return 0;
696}
697
5a04cfa9 698static ide_startstop_t idetape_request_sense_callback(ide_drive_t *drive)
1da177e4
LT		 699{
700 idetape_tape_t *tape = drive->driver_data;
701
8004a8c9
BP		 702 debug_log(DBG_PROCS, "Enter %s\n", __func__);
703
1da177e4 704 if (!tape->pc->error) {
d236d74c 705 idetape_analyze_error(drive, tape->pc->buf);
1da177e4
LT		 706 idetape_end_request(drive, 1, 0);
707 } else {
5a04cfa9
BP		 708 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - "
709 "Aborting request!\n");
1da177e4
LT		 710 idetape_end_request(drive, 0, 0);
711 }
712 return ide_stopped;
713}
714
d236d74c 715static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
1da177e4 716{
5a04cfa9 717 idetape_init_pc(pc);
90699ce2 718 pc->c[0] = REQUEST_SENSE;
1da177e4 719 pc->c[4] = 20;
d236d74c
BP		 720 pc->req_xfer = 20;
721 pc->idetape_callback = &idetape_request_sense_callback;
1da177e4
LT		 722}
723
724static void idetape_init_rq(struct request *rq, u8 cmd)
725{
726 memset(rq, 0, sizeof(*rq));
4aff5e23 727 rq->cmd_type = REQ_TYPE_SPECIAL;
1da177e4
LT		 728 rq->cmd[0] = cmd;
729}
730
731/*
3c98bf34
BP		 732 * Generate a new packet command request in front of the request queue, before
733 * the current request, so that it will be processed immediately, on the next
734 * pass through the driver. The function below is called from the request
735 * handling part of the driver (the "bottom" part). Safe storage for the request
736 * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that.
1da177e4 737 *
3c98bf34
BP		 738 * Memory for those requests is pre-allocated at initialization time, and is
739 * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for
740 * the maximum possible number of inter-dependent packet commands.
1da177e4 741 *
3c98bf34
BP		 742 * The higher level of the driver - The ioctl handler and the character device
743 * handling functions should queue request to the lower level part and wait for
744 * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail.
1da177e4 745 */
d236d74c 746static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc,
5a04cfa9 747 struct request *rq)
1da177e4
LT		 748{
749 struct ide_tape_obj *tape = drive->driver_data;
750
751 idetape_init_rq(rq, REQ_IDETAPE_PC1);
752 rq->buffer = (char *) pc;
753 rq->rq_disk = tape->disk;
754 (void) ide_do_drive_cmd(drive, rq, ide_preempt);
755}
756
757/*
758 * idetape_retry_pc is called when an error was detected during the
759 * last packet command. We queue a request sense packet command in
760 * the head of the request list.
761 */
762static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
763{
764 idetape_tape_t *tape = drive->driver_data;
d236d74c 765 struct ide_atapi_pc *pc;
1da177e4 766 struct request *rq;
1da177e4 767
64a57fe4 768 (void)ide_read_error(drive);
1da177e4
LT		 769 pc = idetape_next_pc_storage(drive);
770 rq = idetape_next_rq_storage(drive);
771 idetape_create_request_sense_cmd(pc);
346331f8 772 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
1da177e4
LT		 773 idetape_queue_pc_head(drive, pc, rq);
774 return ide_stopped;
775}
776
777/*
3c98bf34
BP		 778 * Postpone the current request so that ide.c will be able to service requests
779 * from another device on the same hwgroup while we are polling for DSC.
1da177e4 780 */
5a04cfa9 781static void idetape_postpone_request(ide_drive_t *drive)
1da177e4
LT		 782{
783 idetape_tape_t *tape = drive->driver_data;
784
8004a8c9
BP		 785 debug_log(DBG_PROCS, "Enter %s\n", __func__);
786
1da177e4 787 tape->postponed_rq = HWGROUP(drive)->rq;
54bb2074 788 ide_stall_queue(drive, tape->dsc_poll_freq);
1da177e4
LT		 789}
790
d236d74c 791typedef void idetape_io_buf(ide_drive_t *, struct ide_atapi_pc *, unsigned int);
a1efc85f 792
1da177e4 793/*
a1efc85f
BP		 794 * This is the usual interrupt handler which will be called during a packet
795 * command. We will transfer some of the data (as requested by the drive) and
796 * will re-point interrupt handler to us. When data transfer is finished, we
797 * will act according to the algorithm described before
8d06bfad 798 * idetape_issue_pc.
1da177e4 799 */
a1efc85f 800static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
1da177e4
LT		 801{
802 ide_hwif_t *hwif = drive->hwif;
803 idetape_tape_t *tape = drive->driver_data;
d236d74c 804 struct ide_atapi_pc *pc = tape->pc;
a1efc85f
BP		 805 xfer_func_t *xferfunc;
806 idetape_io_buf *iobuf;
1da177e4
LT		 807 unsigned int temp;
808#if SIMULATE_ERRORS
5a04cfa9 809 static int error_sim_count;
1da177e4 810#endif
790d1239 811 u16 bcount;
8e7657ae 812 u8 stat, ireason;
1da177e4 813
8004a8c9 814 debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__);
1da177e4
LT		 815
816 /* Clear the interrupt */
c47137a9 817 stat = ide_read_status(drive);
1da177e4 818
346331f8 819 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
5e37bdc0 820 if (hwif->dma_ops->dma_end(drive) || (stat & ERR_STAT)) {
1da177e4
LT		 821 /*
822 * A DMA error is sometimes expected. For example,
823 * if the tape is crossing a filemark during a
824 * READ command, it will issue an irq and position
825 * itself before the filemark, so that only a partial
826 * data transfer will occur (which causes the DMA
827 * error). In that case, we will later ask the tape
828 * how much bytes of the original request were
829 * actually transferred (we can't receive that
830 * information from the DMA engine on most chipsets).
831 */
832
833 /*
834 * On the contrary, a DMA error is never expected;
835 * it usually indicates a hardware error or abort.
836 * If the tape crosses a filemark during a READ
837 * command, it will issue an irq and position itself
838 * after the filemark (not before). Only a partial
839 * data transfer will occur, but no DMA error.
840 * (AS, 19 Apr 2001)
841 */
346331f8 842 pc->flags |= PC_FLAG_DMA_ERROR;
1da177e4 843 } else {
d236d74c 844 pc->xferred = pc->req_xfer;
1da177e4
LT		 845 idetape_update_buffers(pc);
846 }
8004a8c9
BP		 847 debug_log(DBG_PROCS, "DMA finished\n");
848
1da177e4
LT		 849 }
850
851 /* No more interrupts */
22c525b9 852 if ((stat & DRQ_STAT) == 0) {
8004a8c9 853 debug_log(DBG_SENSE, "Packet command completed, %d bytes"
d236d74c 854 " transferred\n", pc->xferred);
1da177e4 855
346331f8 856 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
1da177e4
LT		 857 local_irq_enable();
858
859#if SIMULATE_ERRORS
90699ce2 860 if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) &&
1da177e4
LT		 861 (++error_sim_count % 100) == 0) {
862 printk(KERN_INFO "ide-tape: %s: simulating error\n",
863 tape->name);
22c525b9 864 stat |= ERR_STAT;
1da177e4
LT		 865 }
866#endif
90699ce2 867 if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
22c525b9 868 stat &= ~ERR_STAT;
346331f8 869 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
22c525b9 870 /* Error detected */
8004a8c9
BP		 871 debug_log(DBG_ERR, "%s: I/O error\n", tape->name);
872
90699ce2 873 if (pc->c[0] == REQUEST_SENSE) {
a1efc85f
BP		 874 printk(KERN_ERR "ide-tape: I/O error in request"
875 " sense command\n");
1da177e4
LT		 876 return ide_do_reset(drive);
877 }
8004a8c9
BP		 878 debug_log(DBG_ERR, "[cmd %x]: check condition\n",
879 pc->c[0]);
880
1da177e4
LT		 881 /* Retry operation */
882 return idetape_retry_pc(drive);
883 }
884 pc->error = 0;
346331f8 885 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) &&
22c525b9 886 (stat & SEEK_STAT) == 0) {
1da177e4
LT		 887 /* Media access command */
888 tape->dsc_polling_start = jiffies;
54bb2074 889 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
1da177e4
LT		 890 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
891 /* Allow ide.c to handle other requests */
892 idetape_postpone_request(drive);
893 return ide_stopped;
894 }
895 if (tape->failed_pc == pc)
896 tape->failed_pc = NULL;
897 /* Command finished - Call the callback function */
d236d74c 898 return pc->idetape_callback(drive);
1da177e4 899 }
346331f8
BP		 900
901 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
902 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
1da177e4
LT		 903 printk(KERN_ERR "ide-tape: The tape wants to issue more "
904 "interrupts in DMA mode\n");
905 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
7469aaf6 906 ide_dma_off(drive);
1da177e4
LT		 907 return ide_do_reset(drive);
908 }
909 /* Get the number of bytes to transfer on this interrupt. */
23579a2a
BZ		 910 bcount = (hwif->INB(hwif->io_ports[IDE_BCOUNTH_OFFSET]) << 8) |
911 hwif->INB(hwif->io_ports[IDE_BCOUNTL_OFFSET]);
1da177e4 912
23579a2a 913 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
1da177e4 914
8e7657ae 915 if (ireason & CD) {
a1efc85f 916 printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__);
1da177e4
LT		 917 return ide_do_reset(drive);
918 }
346331f8 919 if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
1da177e4
LT		 920 /* Hopefully, we will never get here */
921 printk(KERN_ERR "ide-tape: We wanted to %s, ",
8e7657ae 922 (ireason & IO) ? "Write" : "Read");
1da177e4 923 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
8e7657ae 924 (ireason & IO) ? "Read" : "Write");
1da177e4
LT		 925 return ide_do_reset(drive);
926 }
346331f8 927 if (!(pc->flags & PC_FLAG_WRITING)) {
1da177e4 928 /* Reading - Check that we have enough space */
d236d74c
BP		 929 temp = pc->xferred + bcount;
930 if (temp > pc->req_xfer) {
931 if (temp > pc->buf_size) {
a1efc85f
BP		 932 printk(KERN_ERR "ide-tape: The tape wants to "
933 "send us more data than expected "
934 "- discarding data\n");
7616c0ad 935 ide_atapi_discard_data(drive, bcount);
a1efc85f
BP		 936 ide_set_handler(drive, &idetape_pc_intr,
937 IDETAPE_WAIT_CMD, NULL);
1da177e4
LT		 938 return ide_started;
939 }
8004a8c9
BP		 940 debug_log(DBG_SENSE, "The tape wants to send us more "
941 "data than expected - allowing transfer\n");
1da177e4 942 }
a1efc85f
BP		 943 iobuf = &idetape_input_buffers;
944 xferfunc = hwif->atapi_input_bytes;
1da177e4 945 } else {
a1efc85f
BP		 946 iobuf = &idetape_output_buffers;
947 xferfunc = hwif->atapi_output_bytes;
1da177e4 948 }
a1efc85f
BP		 949
950 if (pc->bh)
951 iobuf(drive, pc, bcount);
952 else
d236d74c 953 xferfunc(drive, pc->cur_pos, bcount);
a1efc85f 954
1da177e4 955 /* Update the current position */
d236d74c
BP		 956 pc->xferred += bcount;
957 pc->cur_pos += bcount;
8004a8c9
BP		 958
959 debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n",
960 pc->c[0], bcount);
961
1da177e4
LT		 962 /* And set the interrupt handler again */
963 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
964 return ide_started;
965}
966
967/*
3c98bf34 968 * Packet Command Interface
1da177e4 969 *
3c98bf34
BP		 970 * The current Packet Command is available in tape->pc, and will not change
971 * until we finish handling it. Each packet command is associated with a
972 * callback function that will be called when the command is finished.
1da177e4 973 *
3c98bf34 974 * The handling will be done in three stages:
1da177e4 975 *
3c98bf34
BP		 976 * 1. idetape_issue_pc will send the packet command to the drive, and will set
977 * the interrupt handler to idetape_pc_intr.
1da177e4 978 *
3c98bf34
BP		 979 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
980 * repeated until the device signals us that no more interrupts will be issued.
1da177e4 981 *
3c98bf34
BP		 982 * 3. ATAPI Tape media access commands have immediate status with a delayed
983 * process. In case of a successful initiation of a media access packet command,
984 * the DSC bit will be set when the actual execution of the command is finished.
985 * Since the tape drive will not issue an interrupt, we have to poll for this
986 * event. In this case, we define the request as "low priority request" by
987 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
988 * exit the driver.
1da177e4 989 *
3c98bf34
BP		 990 * ide.c will then give higher priority to requests which originate from the
991 * other device, until will change rq_status to RQ_ACTIVE.
1da177e4 992 *
3c98bf34 993 * 4. When the packet command is finished, it will be checked for errors.
1da177e4 994 *
3c98bf34
BP		 995 * 5. In case an error was found, we queue a request sense packet command in
996 * front of the request queue and retry the operation up to
997 * IDETAPE_MAX_PC_RETRIES times.
1da177e4 998 *
3c98bf34
BP		 999 * 6. In case no error was found, or we decided to give up and not to retry
1000 * again, the callback function will be called and then we will handle the next
1001 * request.
1da177e4
LT		 1002 */
1003static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
1004{
1005 ide_hwif_t *hwif = drive->hwif;
1006 idetape_tape_t *tape = drive->driver_data;
d236d74c 1007 struct ide_atapi_pc *pc = tape->pc;
1da177e4
LT		 1008 int retries = 100;
1009 ide_startstop_t startstop;
8e7657ae 1010 u8 ireason;
1da177e4 1011
5a04cfa9
BP		 1012 if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
1013 printk(KERN_ERR "ide-tape: Strange, packet command initiated "
1014 "yet DRQ isn't asserted\n");
1da177e4
LT		 1015 return startstop;
1016 }
23579a2a 1017 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
8e7657ae 1018 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
1da177e4
LT		 1019 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
1020 "a packet command, retrying\n");
1021 udelay(100);
23579a2a 1022 ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]);
1da177e4
LT		 1023 if (retries == 0) {
1024 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
1025 "issuing a packet command, ignoring\n");
8e7657ae
BZ		 1026 ireason |= CD;
1027 ireason &= ~IO;
1da177e4
LT		 1028 }
1029 }
8e7657ae 1030 if ((ireason & CD) == 0 || (ireason & IO)) {
1da177e4
LT		 1031 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
1032 "a packet command\n");
1033 return ide_do_reset(drive);
1034 }
1035 /* Set the interrupt routine */
1036 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1037#ifdef CONFIG_BLK_DEV_IDEDMA
1038 /* Begin DMA, if necessary */
346331f8 1039 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS)
5e37bdc0 1040 hwif->dma_ops->dma_start(drive);
1da177e4
LT		 1041#endif
1042 /* Send the actual packet */
1043 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
1044 return ide_started;
1045}
1046
d236d74c
BP		 1047static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
1048 struct ide_atapi_pc *pc)
1da177e4
LT		 1049{
1050 ide_hwif_t *hwif = drive->hwif;
1051 idetape_tape_t *tape = drive->driver_data;
1da177e4 1052 int dma_ok = 0;
790d1239 1053 u16 bcount;
1da177e4 1054
90699ce2
BP		 1055 if (tape->pc->c[0] == REQUEST_SENSE &&
1056 pc->c[0] == REQUEST_SENSE) {
1da177e4
LT		 1057 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
1058 "Two request sense in serial were issued\n");
1059 }
1da177e4 1060
90699ce2 1061 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
1da177e4
LT		 1062 tape->failed_pc = pc;
1063 /* Set the current packet command */
1064 tape->pc = pc;
1065
1066 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
346331f8 1067 (pc->flags & PC_FLAG_ABORT)) {
1da177e4 1068 /*
3c98bf34
BP		 1069 * We will "abort" retrying a packet command in case legitimate
1070 * error code was received (crossing a filemark, or end of the
1071 * media, for example).
1da177e4 1072 */
346331f8 1073 if (!(pc->flags & PC_FLAG_ABORT)) {
90699ce2 1074 if (!(pc->c[0] == TEST_UNIT_READY &&
1da177e4
LT		 1075 tape->sense_key == 2 && tape->asc == 4 &&
1076 (tape->ascq == 1 || tape->ascq == 8))) {
1077 printk(KERN_ERR "ide-tape: %s: I/O error, "
1078 "pc = %2x, key = %2x, "
1079 "asc = %2x, ascq = %2x\n",
1080 tape->name, pc->c[0],
1081 tape->sense_key, tape->asc,
1082 tape->ascq);
1083 }
1084 /* Giving up */
1085 pc->error = IDETAPE_ERROR_GENERAL;
1086 }
1087 tape->failed_pc = NULL;
d236d74c 1088 return pc->idetape_callback(drive);
1da177e4 1089 }
8004a8c9 1090 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
1da177e4
LT		 1091
1092 pc->retries++;
1093 /* We haven't transferred any data yet */
d236d74c
BP		 1094 pc->xferred = 0;
1095 pc->cur_pos = pc->buf;
1da177e4 1096 /* Request to transfer the entire buffer at once */
d236d74c 1097 bcount = pc->req_xfer;
1da177e4 1098
346331f8
BP		 1099 if (pc->flags & PC_FLAG_DMA_ERROR) {
1100 pc->flags &= ~PC_FLAG_DMA_ERROR;
1da177e4
LT		 1101 printk(KERN_WARNING "ide-tape: DMA disabled, "
1102 "reverting to PIO\n");
7469aaf6 1103 ide_dma_off(drive);
1da177e4 1104 }
346331f8 1105 if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma)
5e37bdc0 1106 dma_ok = !hwif->dma_ops->dma_setup(drive);
1da177e4 1107
2fc57388
BZ		 1108 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
1109 IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
1110
346331f8
BP		 1111 if (dma_ok)
1112 /* Will begin DMA later */
1113 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
1114 if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags)) {
c1c9dbc8
BZ		 1115 ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc,
1116 IDETAPE_WAIT_CMD, NULL);
1da177e4
LT		 1117 return ide_started;
1118 } else {
23579a2a 1119 hwif->OUTB(WIN_PACKETCMD, hwif->io_ports[IDE_COMMAND_OFFSET]);
1da177e4
LT		 1120 return idetape_transfer_pc(drive);
1121 }
1122}
1123
5a04cfa9 1124static ide_startstop_t idetape_pc_callback(ide_drive_t *drive)
1da177e4
LT		 1125{
1126 idetape_tape_t *tape = drive->driver_data;
8004a8c9
BP		 1127
1128 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1da177e4
LT		 1129
1130 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
1131 return ide_stopped;
1132}
1133
3c98bf34 1134/* A mode sense command is used to "sense" tape parameters. */
d236d74c 1135static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
1da177e4
LT		 1136{
1137 idetape_init_pc(pc);
90699ce2 1138 pc->c[0] = MODE_SENSE;
1da177e4 1139 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
3c98bf34
BP		 1140 /* DBD = 1 - Don't return block descriptors */
1141 pc->c[1] = 8;
1da177e4
LT		 1142 pc->c[2] = page_code;
1143 /*
1144 * Changed pc->c[3] to 0 (255 will at best return unused info).
1145 *
1146 * For SCSI this byte is defined as subpage instead of high byte
1147 * of length and some IDE drives seem to interpret it this way
1148 * and return an error when 255 is used.
1149 */
1150 pc->c[3] = 0;
3c98bf34
BP		 1151 /* We will just discard data in that case */
1152 pc->c[4] = 255;
1da177e4 1153 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
d236d74c 1154 pc->req_xfer = 12;
1da177e4 1155 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
d236d74c 1156 pc->req_xfer = 24;
1da177e4 1157 else
d236d74c
BP		 1158 pc->req_xfer = 50;
1159 pc->idetape_callback = &idetape_pc_callback;
1da177e4
LT		 1160}
1161
5a04cfa9 1162static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
1da177e4
LT		 1163{
1164 idetape_tape_t *tape = drive->driver_data;
d236d74c 1165 struct ide_atapi_pc *pc = tape->pc;
22c525b9 1166 u8 stat;
1da177e4 1167
c47137a9
BZ		 1168 stat = ide_read_status(drive);
1169
22c525b9
BZ		 1170 if (stat & SEEK_STAT) {
1171 if (stat & ERR_STAT) {
1da177e4 1172 /* Error detected */
90699ce2 1173 if (pc->c[0] != TEST_UNIT_READY)
1da177e4
LT		 1174 printk(KERN_ERR "ide-tape: %s: I/O error, ",
1175 tape->name);
1176 /* Retry operation */
1177 return idetape_retry_pc(drive);
1178 }
1179 pc->error = 0;
1180 if (tape->failed_pc == pc)
1181 tape->failed_pc = NULL;
1182 } else {
1183 pc->error = IDETAPE_ERROR_GENERAL;
1184 tape->failed_pc = NULL;
1185 }
d236d74c 1186 return pc->idetape_callback(drive);
1da177e4
LT		 1187}
1188
5a04cfa9 1189static ide_startstop_t idetape_rw_callback(ide_drive_t *drive)
1da177e4
LT		 1190{
1191 idetape_tape_t *tape = drive->driver_data;
1192 struct request *rq = HWGROUP(drive)->rq;
d236d74c 1193 int blocks = tape->pc->xferred / tape->blk_size;
1da177e4 1194
54bb2074
BP		 1195 tape->avg_size += blocks * tape->blk_size;
1196 tape->insert_size += blocks * tape->blk_size;
1da177e4
LT		 1197 if (tape->insert_size > 1024 * 1024)
1198 tape->measure_insert_time = 1;
1199 if (tape->measure_insert_time) {
1200 tape->measure_insert_time = 0;
1201 tape->insert_time = jiffies;
1202 tape->insert_size = 0;
1203 }
1204 if (time_after(jiffies, tape->insert_time))
5a04cfa9
BP		 1205 tape->insert_speed = tape->insert_size / 1024 * HZ /
1206 (jiffies - tape->insert_time);
9bae1ff3 1207 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
5a04cfa9
BP		 1208 tape->avg_speed = tape->avg_size * HZ /
1209 (jiffies - tape->avg_time) / 1024;
1da177e4
LT		 1210 tape->avg_size = 0;
1211 tape->avg_time = jiffies;
1212 }
8004a8c9 1213 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1da177e4 1214
54bb2074 1215 tape->first_frame += blocks;
1da177e4
LT		 1216 rq->current_nr_sectors -= blocks;
1217
1218 if (!tape->pc->error)
1219 idetape_end_request(drive, 1, 0);
1220 else
1221 idetape_end_request(drive, tape->pc->error, 0);
1222 return ide_stopped;
1223}
1224
d236d74c
BP		 1225static void idetape_create_read_cmd(idetape_tape_t *tape,
1226 struct ide_atapi_pc *pc,
5a04cfa9 1227 unsigned int length, struct idetape_bh *bh)
1da177e4
LT		 1228{
1229 idetape_init_pc(pc);
90699ce2 1230 pc->c[0] = READ_6;
860ff5ec 1231 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
1da177e4 1232 pc->c[1] = 1;
d236d74c 1233 pc->idetape_callback = &idetape_rw_callback;
1da177e4
LT		 1234 pc->bh = bh;
1235 atomic_set(&bh->b_count, 0);
d236d74c
BP		 1236 pc->buf = NULL;
1237 pc->buf_size = length * tape->blk_size;
1238 pc->req_xfer = pc->buf_size;
1239 if (pc->req_xfer == tape->stage_size)
346331f8 1240 pc->flags |= PC_FLAG_DMA_RECOMMENDED;
1da177e4
LT		 1241}
1242
d236d74c
BP		 1243static void idetape_create_write_cmd(idetape_tape_t *tape,
1244 struct ide_atapi_pc *pc,
5a04cfa9 1245 unsigned int length, struct idetape_bh *bh)
1da177e4
LT		 1246{
1247 idetape_init_pc(pc);
90699ce2 1248 pc->c[0] = WRITE_6;
860ff5ec 1249 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
1da177e4 1250 pc->c[1] = 1;
d236d74c 1251 pc->idetape_callback = &idetape_rw_callback;
346331f8 1252 pc->flags |= PC_FLAG_WRITING;
1da177e4
LT		 1253 pc->bh = bh;
1254 pc->b_data = bh->b_data;
1255 pc->b_count = atomic_read(&bh->b_count);
d236d74c
BP		 1256 pc->buf = NULL;
1257 pc->buf_size = length * tape->blk_size;
1258 pc->req_xfer = pc->buf_size;
1259 if (pc->req_xfer == tape->stage_size)
346331f8 1260 pc->flags |= PC_FLAG_DMA_RECOMMENDED;
1da177e4
LT		 1261}
1262
1da177e4
LT		 1263static ide_startstop_t idetape_do_request(ide_drive_t *drive,
1264 struct request *rq, sector_t block)
1265{
1266 idetape_tape_t *tape = drive->driver_data;
d236d74c 1267 struct ide_atapi_pc *pc = NULL;
1da177e4 1268 struct request *postponed_rq = tape->postponed_rq;
22c525b9 1269 u8 stat;
1da177e4 1270
8004a8c9
BP		 1271 debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld,"
1272 " current_nr_sectors: %d\n",
1da177e4 1273 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
1da177e4 1274
4aff5e23 1275 if (!blk_special_request(rq)) {
3c98bf34 1276 /* We do not support buffer cache originated requests. */
1da177e4 1277 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
4aff5e23 1278 "request queue (%d)\n", drive->name, rq->cmd_type);
1da177e4
LT		 1279 ide_end_request(drive, 0, 0);
1280 return ide_stopped;
1281 }
1282
3c98bf34 1283 /* Retry a failed packet command */
5a04cfa9 1284 if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE)
8d06bfad 1285 return idetape_issue_pc(drive, tape->failed_pc);
5a04cfa9 1286
1da177e4
LT		 1287 if (postponed_rq != NULL)
1288 if (rq != postponed_rq) {
1289 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
1290 "Two DSC requests were queued\n");
1291 idetape_end_request(drive, 0, 0);
1292 return ide_stopped;
1293 }
1da177e4
LT		 1294
1295 tape->postponed_rq = NULL;
1296
1297 /*
1298 * If the tape is still busy, postpone our request and service
1299 * the other device meanwhile.
1300 */
c47137a9 1301 stat = ide_read_status(drive);
1da177e4
LT		 1302
1303 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
346331f8 1304 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
1da177e4
LT		 1305
1306 if (drive->post_reset == 1) {
346331f8 1307 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags);
1da177e4
LT		 1308 drive->post_reset = 0;
1309 }
1310
1da177e4 1311 if (time_after(jiffies, tape->insert_time))
5a04cfa9
BP		 1312 tape->insert_speed = tape->insert_size / 1024 * HZ /
1313 (jiffies - tape->insert_time);
346331f8 1314 if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) &&
22c525b9 1315 (stat & SEEK_STAT) == 0) {
1da177e4
LT		 1316 if (postponed_rq == NULL) {
1317 tape->dsc_polling_start = jiffies;
54bb2074 1318 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
1da177e4
LT		 1319 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
1320 } else if (time_after(jiffies, tape->dsc_timeout)) {
1321 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
1322 tape->name);
1323 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1324 idetape_media_access_finished(drive);
1325 return ide_stopped;
1326 } else {
1327 return ide_do_reset(drive);
1328 }
5a04cfa9
BP		 1329 } else if (time_after(jiffies,
1330 tape->dsc_polling_start +
1331 IDETAPE_DSC_MA_THRESHOLD))
54bb2074 1332 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
1da177e4
LT		 1333 idetape_postpone_request(drive);
1334 return ide_stopped;
1335 }
1336 if (rq->cmd[0] & REQ_IDETAPE_READ) {
1da177e4
LT		 1337 tape->postpone_cnt = 0;
1338 pc = idetape_next_pc_storage(drive);
5a04cfa9
BP		 1339 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors,
1340 (struct idetape_bh *)rq->special);
1da177e4
LT		 1341 goto out;
1342 }
1343 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
1da177e4
LT		 1344 tape->postpone_cnt = 0;
1345 pc = idetape_next_pc_storage(drive);
5a04cfa9
BP		 1346 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors,
1347 (struct idetape_bh *)rq->special);
1da177e4
LT		 1348 goto out;
1349 }
1da177e4 1350 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
d236d74c 1351 pc = (struct ide_atapi_pc *) rq->buffer;
1da177e4
LT		 1352 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
1353 rq->cmd[0] |= REQ_IDETAPE_PC2;
1354 goto out;
1355 }
1356 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
1357 idetape_media_access_finished(drive);
1358 return ide_stopped;
1359 }
1360 BUG();
1361out:
8d06bfad 1362 return idetape_issue_pc(drive, pc);
1da177e4
LT		 1363}
1364
3c98bf34 1365/* Pipeline related functions */
1da177e4
LT		 1366
1367/*
3c98bf34
BP		 1368 * The function below uses __get_free_page to allocate a pipeline stage, along
1369 * with all the necessary small buffers which together make a buffer of size
1370 * tape->stage_size (or a bit more). We attempt to combine sequential pages as
1371 * much as possible.
1da177e4 1372 *
3c98bf34
BP		 1373 * It returns a pointer to the new allocated stage, or NULL if we can't (or
1374 * don't want to) allocate a stage.
1da177e4 1375 *
3c98bf34
BP		 1376 * Pipeline stages are optional and are used to increase performance. If we
1377 * can't allocate them, we'll manage without them.
1da177e4 1378 */
5a04cfa9
BP		 1379static idetape_stage_t *__idetape_kmalloc_stage(idetape_tape_t *tape, int full,
1380 int clear)
1da177e4
LT		 1381{
1382 idetape_stage_t *stage;
1383 struct idetape_bh *prev_bh, *bh;
1384 int pages = tape->pages_per_stage;
1385 char *b_data = NULL;
1386
5a04cfa9
BP		 1387 stage = kmalloc(sizeof(idetape_stage_t), GFP_KERNEL);
1388 if (!stage)
1da177e4
LT		 1389 return NULL;
1390 stage->next = NULL;
1391
5a04cfa9
BP		 1392 stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1393 bh = stage->bh;
1da177e4
LT		 1394 if (bh == NULL)
1395 goto abort;
1396 bh->b_reqnext = NULL;
5a04cfa9
BP		 1397 bh->b_data = (char *) __get_free_page(GFP_KERNEL);
1398 if (!bh->b_data)
1da177e4
LT		 1399 goto abort;
1400 if (clear)
1401 memset(bh->b_data, 0, PAGE_SIZE);
1402 bh->b_size = PAGE_SIZE;
1403 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1404
1405 while (--pages) {
5a04cfa9
BP		 1406 b_data = (char *) __get_free_page(GFP_KERNEL);
1407 if (!b_data)
1da177e4
LT		 1408 goto abort;
1409 if (clear)
1410 memset(b_data, 0, PAGE_SIZE);
1411 if (bh->b_data == b_data + PAGE_SIZE) {
1412 bh->b_size += PAGE_SIZE;
1413 bh->b_data -= PAGE_SIZE;
1414 if (full)
1415 atomic_add(PAGE_SIZE, &bh->b_count);
1416 continue;
1417 }
1418 if (b_data == bh->b_data + bh->b_size) {
1419 bh->b_size += PAGE_SIZE;
1420 if (full)
1421 atomic_add(PAGE_SIZE, &bh->b_count);
1422 continue;
1423 }
1424 prev_bh = bh;
5a04cfa9
BP		 1425 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1426 if (!bh) {
1da177e4
LT		 1427 free_page((unsigned long) b_data);
1428 goto abort;
1429 }
1430 bh->b_reqnext = NULL;
1431 bh->b_data = b_data;
1432 bh->b_size = PAGE_SIZE;
1433 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1434 prev_bh->b_reqnext = bh;
1435 }
1436 bh->b_size -= tape->excess_bh_size;
1437 if (full)
1438 atomic_sub(tape->excess_bh_size, &bh->b_count);
1439 return stage;
1440abort:
1441 __idetape_kfree_stage(stage);
1442 return NULL;
1443}
1444
5a04cfa9 1445static int idetape_copy_stage_from_user(idetape_tape_t *tape,
8646c88f 1446 const char __user *buf, int n)
1da177e4
LT		 1447{
1448 struct idetape_bh *bh = tape->bh;
1449 int count;
dcd96379 1450 int ret = 0;
1da177e4
LT		 1451
1452 while (n) {
1da177e4 1453 if (bh == NULL) {
5a04cfa9
BP		 1454 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1455 __func__);
dcd96379 1456 return 1;
1da177e4 1457 }
5a04cfa9
BP		 1458 count = min((unsigned int)
1459 (bh->b_size - atomic_read(&bh->b_count)),
1460 (unsigned int)n);
1461 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1462 count))
dcd96379 1463 ret = 1;
1da177e4
LT		 1464 n -= count;
1465 atomic_add(count, &bh->b_count);
1466 buf += count;
1467 if (atomic_read(&bh->b_count) == bh->b_size) {
1468 bh = bh->b_reqnext;
1469 if (bh)
1470 atomic_set(&bh->b_count, 0);
1471 }
1472 }
1473 tape->bh = bh;
dcd96379 1474 return ret;
1da177e4
LT		 1475}
1476
5a04cfa9 1477static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
99d74e61 1478 int n)
1da177e4
LT		 1479{
1480 struct idetape_bh *bh = tape->bh;
1481 int count;
dcd96379 1482 int ret = 0;
1da177e4
LT		 1483
1484 while (n) {
1da177e4 1485 if (bh == NULL) {
5a04cfa9
BP		 1486 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1487 __func__);
dcd96379 1488 return 1;
1da177e4 1489 }
1da177e4 1490 count = min(tape->b_count, n);
dcd96379
DW		 1491 if (copy_to_user(buf, tape->b_data, count))
1492 ret = 1;
1da177e4
LT		 1493 n -= count;
1494 tape->b_data += count;
1495 tape->b_count -= count;
1496 buf += count;
1497 if (!tape->b_count) {
5a04cfa9
BP		 1498 bh = bh->b_reqnext;
1499 tape->bh = bh;
1da177e4
LT		 1500 if (bh) {
1501 tape->b_data = bh->b_data;
1502 tape->b_count = atomic_read(&bh->b_count);
1503 }
1504 }
1505 }
dcd96379 1506 return ret;
1da177e4
LT		 1507}
1508
5a04cfa9 1509static void idetape_init_merge_stage(idetape_tape_t *tape)
1da177e4
LT		 1510{
1511 struct idetape_bh *bh = tape->merge_stage->bh;
5a04cfa9 1512
1da177e4 1513 tape->bh = bh;
54abf37e 1514 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1da177e4
LT		 1515 atomic_set(&bh->b_count, 0);
1516 else {
1517 tape->b_data = bh->b_data;
1518 tape->b_count = atomic_read(&bh->b_count);
1519 }
1520}
1521
a2f5b7f4 1522static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive)
1da177e4
LT		 1523{
1524 idetape_tape_t *tape = drive->driver_data;
d236d74c 1525 u8 *readpos = tape->pc->buf;
8004a8c9
BP		 1526
1527 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1da177e4
LT		 1528
1529 if (!tape->pc->error) {
a2f5b7f4
BP		 1530 debug_log(DBG_SENSE, "BOP - %s\n",
1531 (readpos[0] & 0x80) ? "Yes" : "No");
1532 debug_log(DBG_SENSE, "EOP - %s\n",
1533 (readpos[0] & 0x40) ? "Yes" : "No");
1534
1535 if (readpos[0] & 0x4) {
1536 printk(KERN_INFO "ide-tape: Block location is unknown"
1537 "to the tape\n");
346331f8 1538 clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
1da177e4
LT		 1539 idetape_end_request(drive, 0, 0);
1540 } else {
8004a8c9 1541 debug_log(DBG_SENSE, "Block Location - %u\n",
a2f5b7f4
BP		 1542 be32_to_cpu(*(u32 *)&readpos[4]));
1543
1544 tape->partition = readpos[1];
54bb2074 1545 tape->first_frame =
a2f5b7f4 1546 be32_to_cpu(*(u32 *)&readpos[4]);
346331f8 1547 set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags);
1da177e4
LT		 1548 idetape_end_request(drive, 1, 0);
1549 }
1550 } else {
1551 idetape_end_request(drive, 0, 0);
1552 }
1553 return ide_stopped;
1554}
1555
1556/*
3c98bf34
BP		 1557 * Write a filemark if write_filemark=1. Flush the device buffers without
1558 * writing a filemark otherwise.
1da177e4 1559 */
5a04cfa9 1560static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
d236d74c 1561 struct ide_atapi_pc *pc, int write_filemark)
1da177e4
LT		 1562{
1563 idetape_init_pc(pc);
90699ce2 1564 pc->c[0] = WRITE_FILEMARKS;
1da177e4 1565 pc->c[4] = write_filemark;
346331f8 1566 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
d236d74c 1567 pc->idetape_callback = &idetape_pc_callback;
1da177e4
LT		 1568}
1569
d236d74c 1570static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc)
1da177e4
LT		 1571{
1572 idetape_init_pc(pc);
90699ce2 1573 pc->c[0] = TEST_UNIT_READY;
d236d74c 1574 pc->idetape_callback = &idetape_pc_callback;
1da177e4
LT		 1575}
1576
1577/*
3c98bf34
BP		 1578 * We add a special packet command request to the tail of the request queue, and
1579 * wait for it to be serviced. This is not to be called from within the request
1580 * handling part of the driver! We allocate here data on the stack and it is
1581 * valid until the request is finished. This is not the case for the bottom part
1582 * of the driver, where we are always leaving the functions to wait for an
1583 * interrupt or a timer event.
1da177e4 1584 *
3c98bf34
BP		 1585 * From the bottom part of the driver, we should allocate safe memory using
1586 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request
1587 * to the request list without waiting for it to be serviced! In that case, we
1588 * usually use idetape_queue_pc_head().
1da177e4 1589 */
ea1ab3d3 1590static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
1da177e4
LT		 1591{
1592 struct ide_tape_obj *tape = drive->driver_data;
1593 struct request rq;
1594
1595 idetape_init_rq(&rq, REQ_IDETAPE_PC1);
1596 rq.buffer = (char *) pc;
1597 rq.rq_disk = tape->disk;
1598 return ide_do_drive_cmd(drive, &rq, ide_wait);
1599}
1600
d236d74c
BP		 1601static void idetape_create_load_unload_cmd(ide_drive_t *drive,
1602 struct ide_atapi_pc *pc, int cmd)
1da177e4
LT		 1603{
1604 idetape_init_pc(pc);
90699ce2 1605 pc->c[0] = START_STOP;
1da177e4 1606 pc->c[4] = cmd;
346331f8 1607 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
d236d74c 1608 pc->idetape_callback = &idetape_pc_callback;
1da177e4
LT		 1609}
1610
1611static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1612{
1613 idetape_tape_t *tape = drive->driver_data;
d236d74c 1614 struct ide_atapi_pc pc;
1da177e4
LT		 1615 int load_attempted = 0;
1616
3c98bf34 1617 /* Wait for the tape to become ready */
346331f8 1618 set_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags);
1da177e4
LT		 1619 timeout += jiffies;
1620 while (time_before(jiffies, timeout)) {
1621 idetape_create_test_unit_ready_cmd(&pc);
ea1ab3d3 1622 if (!idetape_queue_pc_tail(drive, &pc))
1da177e4
LT		 1623 return 0;
1624 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
3c98bf34
BP		 1625 || (tape->asc == 0x3A)) {
1626 /* no media */
1da177e4
LT		 1627 if (load_attempted)
1628 return -ENOMEDIUM;
5a04cfa9
BP		 1629 idetape_create_load_unload_cmd(drive, &pc,
1630 IDETAPE_LU_LOAD_MASK);
ea1ab3d3 1631 idetape_queue_pc_tail(drive, &pc);
1da177e4
LT		 1632 load_attempted = 1;
1633 /* not about to be ready */
1634 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1635 (tape->ascq == 1 || tape->ascq == 8)))
1636 return -EIO;
80ce45fd 1637 msleep(100);
1da177e4
LT		 1638 }
1639 return -EIO;
1640}
1641
5a04cfa9 1642static int idetape_flush_tape_buffers(ide_drive_t *drive)
1da177e4 1643{
d236d74c 1644 struct ide_atapi_pc pc;
1da177e4
LT		 1645 int rc;
1646
1647 idetape_create_write_filemark_cmd(drive, &pc, 0);
5a04cfa9
BP		 1648 rc = idetape_queue_pc_tail(drive, &pc);
1649 if (rc)
1da177e4
LT		 1650 return rc;
1651 idetape_wait_ready(drive, 60 * 5 * HZ);
1652 return 0;
1653}
1654
d236d74c 1655static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1da177e4
LT		 1656{
1657 idetape_init_pc(pc);
90699ce2 1658 pc->c[0] = READ_POSITION;
d236d74c
BP		 1659 pc->req_xfer = 20;
1660 pc->idetape_callback = &idetape_read_position_callback;
1da177e4
LT		 1661}
1662
5a04cfa9 1663static int idetape_read_position(ide_drive_t *drive)
1da177e4
LT		 1664{
1665 idetape_tape_t *tape = drive->driver_data;
d236d74c 1666 struct ide_atapi_pc pc;
1da177e4
LT		 1667 int position;
1668
8004a8c9 1669 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1da177e4
LT		 1670
1671 idetape_create_read_position_cmd(&pc);
1672 if (idetape_queue_pc_tail(drive, &pc))
1673 return -1;
54bb2074 1674 position = tape->first_frame;
1da177e4
LT		 1675 return position;
1676}
1677
d236d74c
BP		 1678static void idetape_create_locate_cmd(ide_drive_t *drive,
1679 struct ide_atapi_pc *pc,
5a04cfa9 1680 unsigned int block, u8 partition, int skip)
1da177e4
LT		 1681{
1682 idetape_init_pc(pc);
90699ce2 1683 pc->c[0] = POSITION_TO_ELEMENT;
1da177e4 1684 pc->c[1] = 2;
860ff5ec 1685 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1da177e4 1686 pc->c[8] = partition;
346331f8 1687 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
d236d74c 1688 pc->idetape_callback = &idetape_pc_callback;
1da177e4
LT		 1689}
1690
d236d74c
BP		 1691static int idetape_create_prevent_cmd(ide_drive_t *drive,
1692 struct ide_atapi_pc *pc, int prevent)
1da177e4
LT		 1693{
1694 idetape_tape_t *tape = drive->driver_data;
1695
b6422013
BP		 1696 /* device supports locking according to capabilities page */
1697 if (!(tape->caps[6] & 0x01))
1da177e4
LT		 1698 return 0;
1699
1700 idetape_init_pc(pc);
90699ce2 1701 pc->c[0] = ALLOW_MEDIUM_REMOVAL;
1da177e4 1702 pc->c[4] = prevent;
d236d74c 1703 pc->idetape_callback = &idetape_pc_callback;
1da177e4
LT		 1704 return 1;
1705}
1706
5a04cfa9 1707static int __idetape_discard_read_pipeline(ide_drive_t *drive)
1da177e4
LT		 1708{
1709 idetape_tape_t *tape = drive->driver_data;
1710 unsigned long flags;
1711 int cnt;
1712
54abf37e 1713 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1da177e4
LT		 1714 return 0;
1715
1716 /* Remove merge stage. */
54bb2074 1717 cnt = tape->merge_stage_size / tape->blk_size;
346331f8 1718 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
1da177e4
LT		 1719 ++cnt; /* Filemarks count as 1 sector */
1720 tape->merge_stage_size = 0;
1721 if (tape->merge_stage != NULL) {
1722 __idetape_kfree_stage(tape->merge_stage);
1723 tape->merge_stage = NULL;
1724 }
1725
54abf37e 1726 tape->chrdev_dir = IDETAPE_DIR_NONE;
1da177e4
LT		 1727
1728 /* Remove pipeline stages. */
1729 if (tape->first_stage == NULL)
1730 return 0;
1731
54bb2074 1732 spin_lock_irqsave(&tape->lock, flags);
1da177e4 1733 tape->next_stage = NULL;
54bb2074 1734 spin_unlock_irqrestore(&tape->lock, flags);
1da177e4
LT		 1735
1736 while (tape->first_stage != NULL) {
1737 struct request *rq_ptr = &tape->first_stage->rq;
1738
5a04cfa9 1739 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
1da177e4
LT		 1740 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
1741 ++cnt;
1da177e4
LT		 1742 }
1743 tape->nr_pending_stages = 0;
1744 tape->max_stages = tape->min_pipeline;
1745 return cnt;
1746}
1747
1748/*
3c98bf34
BP		 1749 * Position the tape to the requested block using the LOCATE packet command.
1750 * A READ POSITION command is then issued to check where we are positioned. Like
1751 * all higher level operations, we queue the commands at the tail of the request
1752 * queue and wait for their completion.
1da177e4 1753 */
5a04cfa9
BP		 1754static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1755 u8 partition, int skip)
1da177e4
LT		 1756{
1757 idetape_tape_t *tape = drive->driver_data;
1758 int retval;
d236d74c 1759 struct ide_atapi_pc pc;
1da177e4 1760
54abf37e 1761 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1da177e4
LT		 1762 __idetape_discard_read_pipeline(drive);
1763 idetape_wait_ready(drive, 60 * 5 * HZ);
1764 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1765 retval = idetape_queue_pc_tail(drive, &pc);
1766 if (retval)
1767 return (retval);
1768
1769 idetape_create_read_position_cmd(&pc);
1770 return (idetape_queue_pc_tail(drive, &pc));
1771}
1772
5a04cfa9
BP		 1773static void idetape_discard_read_pipeline(ide_drive_t *drive,
1774 int restore_position)
1da177e4
LT		 1775{
1776 idetape_tape_t *tape = drive->driver_data;
1777 int cnt;
1778 int seek, position;
1779
1780 cnt = __idetape_discard_read_pipeline(drive);
1781 if (restore_position) {
1782 position = idetape_read_position(drive);
1783 seek = position > cnt ? position - cnt : 0;
1784 if (idetape_position_tape(drive, seek, 0, 0)) {
5a04cfa9
BP		 1785 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1786 " discard_pipeline()\n", tape->name);
1da177e4
LT		 1787 return;
1788 }
1789 }
1790}
1791
1792/*
3c98bf34
BP		 1793 * Generate a read/write request for the block device interface and wait for it
1794 * to be serviced.
1da177e4 1795 */
5a04cfa9
BP		 1796static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1797 struct idetape_bh *bh)
1da177e4
LT		 1798{
1799 idetape_tape_t *tape = drive->driver_data;
1800 struct request rq;
1801
8004a8c9
BP		 1802 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1803
1da177e4
LT		 1804 idetape_init_rq(&rq, cmd);
1805 rq.rq_disk = tape->disk;
1806 rq.special = (void *)bh;
54bb2074 1807 rq.sector = tape->first_frame;
5a04cfa9
BP		 1808 rq.nr_sectors = blocks;
1809 rq.current_nr_sectors = blocks;
1da177e4
LT		 1810 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
1811
1812 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1813 return 0;
1814
1815 if (tape->merge_stage)
1816 idetape_init_merge_stage(tape);
1817 if (rq.errors == IDETAPE_ERROR_GENERAL)
1818 return -EIO;
54bb2074 1819 return (tape->blk_size * (blocks-rq.current_nr_sectors));
1da177e4
LT		 1820}
1821
d236d74c 1822static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1da177e4
LT		 1823{
1824 idetape_init_pc(pc);
90699ce2 1825 pc->c[0] = INQUIRY;
5a04cfa9 1826 pc->c[4] = 254;
d236d74c
BP		 1827 pc->req_xfer = 254;
1828 pc->idetape_callback = &idetape_pc_callback;
1da177e4
LT		 1829}
1830
d236d74c
BP		 1831static void idetape_create_rewind_cmd(ide_drive_t *drive,
1832 struct ide_atapi_pc *pc)
1da177e4
LT		 1833{
1834 idetape_init_pc(pc);
90699ce2 1835 pc->c[0] = REZERO_UNIT;
346331f8 1836 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
d236d74c 1837 pc->idetape_callback = &idetape_pc_callback;
1da177e4
LT		 1838}
1839
d236d74c 1840static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1da177e4
LT		 1841{
1842 idetape_init_pc(pc);
90699ce2 1843 pc->c[0] = ERASE;
1da177e4 1844 pc->c[1] = 1;
346331f8 1845 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
d236d74c 1846 pc->idetape_callback = &idetape_pc_callback;
1da177e4
LT		 1847}
1848
d236d74c 1849static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1da177e4
LT		 1850{
1851 idetape_init_pc(pc);
90699ce2 1852 pc->c[0] = SPACE;
860ff5ec 1853 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1da177e4 1854 pc->c[1] = cmd;
346331f8 1855 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
d236d74c 1856 pc->idetape_callback = &idetape_pc_callback;
1da177e4
LT		 1857}
1858
97c566ce 1859/* Queue up a character device originated write request. */
5a04cfa9 1860static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1da177e4
LT		 1861{
1862 idetape_tape_t *tape = drive->driver_data;
1da177e4 1863
8004a8c9 1864 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1da177e4 1865
0aa4b01e
BP		 1866 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1867 blocks, tape->merge_stage->bh);
1da177e4
LT		 1868}
1869
5a04cfa9 1870static void idetape_empty_write_pipeline(ide_drive_t *drive)
1da177e4
LT		 1871{
1872 idetape_tape_t *tape = drive->driver_data;
1873 int blocks, min;
1874 struct idetape_bh *bh;
55a5d291 1875
54abf37e 1876 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
5a04cfa9
BP		 1877 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline,"
1878 " but we are not writing.\n");
1da177e4
LT		 1879 return;
1880 }
1881 if (tape->merge_stage_size > tape->stage_size) {
1882 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1883 tape->merge_stage_size = tape->stage_size;
1884 }
1da177e4 1885 if (tape->merge_stage_size) {
54bb2074
BP		 1886 blocks = tape->merge_stage_size / tape->blk_size;
1887 if (tape->merge_stage_size % tape->blk_size) {
1da177e4
LT		 1888 unsigned int i;
1889
1890 blocks++;
54bb2074
BP		 1891 i = tape->blk_size - tape->merge_stage_size %
1892 tape->blk_size;
1da177e4
LT		 1893 bh = tape->bh->b_reqnext;
1894 while (bh) {
1895 atomic_set(&bh->b_count, 0);
1896 bh = bh->b_reqnext;
1897 }
1898 bh = tape->bh;
1899 while (i) {
1900 if (bh == NULL) {
5a04cfa9
BP		 1901 printk(KERN_INFO "ide-tape: bug,"
1902 " bh NULL\n");
1da177e4
LT		 1903 break;
1904 }
5a04cfa9
BP		 1905 min = min(i, (unsigned int)(bh->b_size -
1906 atomic_read(&bh->b_count)));
1907 memset(bh->b_data + atomic_read(&bh->b_count),
1908 0, min);
1da177e4
LT		 1909 atomic_add(min, &bh->b_count);
1910 i -= min;
1911 bh = bh->b_reqnext;
1912 }
1913 }
1914 (void) idetape_add_chrdev_write_request(drive, blocks);
1915 tape->merge_stage_size = 0;
1916 }
1da177e4
LT		 1917 if (tape->merge_stage != NULL) {
1918 __idetape_kfree_stage(tape->merge_stage);
1919 tape->merge_stage = NULL;
1920 }
54abf37e 1921 tape->chrdev_dir = IDETAPE_DIR_NONE;
1da177e4
LT		 1922
1923 /*
3c98bf34
BP		 1924 * On the next backup, perform the feedback loop again. (I don't want to
1925 * keep sense information between backups, as some systems are
1926 * constantly on, and the system load can be totally different on the
1927 * next backup).
1da177e4
LT		 1928 */
1929 tape->max_stages = tape->min_pipeline;
1da177e4
LT		 1930 if (tape->first_stage != NULL ||
1931 tape->next_stage != NULL ||
1932 tape->last_stage != NULL ||
1933 tape->nr_stages != 0) {
1934 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
1935 "first_stage %p, next_stage %p, "
1936 "last_stage %p, nr_stages %d\n",
1937 tape->first_stage, tape->next_stage,
1938 tape->last_stage, tape->nr_stages);
1939 }
1da177e4
LT		 1940}
1941
8d06bfad 1942static int idetape_init_read(ide_drive_t *drive, int max_stages)
1da177e4
LT		 1943{
1944 idetape_tape_t *tape = drive->driver_data;
1da177e4 1945 int bytes_read;
1da177e4
LT		 1946
1947 /* Initialize read operation */
54abf37e
BP		 1948 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1949 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1da177e4
LT		 1950 idetape_empty_write_pipeline(drive);
1951 idetape_flush_tape_buffers(drive);
1952 }
1da177e4 1953 if (tape->merge_stage || tape->merge_stage_size) {
5a04cfa9
BP		 1954 printk(KERN_ERR "ide-tape: merge_stage_size should be"
1955 " 0 now\n");
1da177e4
LT		 1956 tape->merge_stage_size = 0;
1957 }
5a04cfa9
BP		 1958 tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0);
1959 if (!tape->merge_stage)
1da177e4 1960 return -ENOMEM;
54abf37e 1961 tape->chrdev_dir = IDETAPE_DIR_READ;
1da177e4
LT		 1962
1963 /*
3c98bf34
BP		 1964 * Issue a read 0 command to ensure that DSC handshake is
1965 * switched from completion mode to buffer available mode.
1966 * No point in issuing this if DSC overlap isn't supported, some
1967 * drives (Seagate STT3401A) will return an error.
1da177e4
LT		 1968 */
1969 if (drive->dsc_overlap) {
5a04cfa9
BP		 1970 bytes_read = idetape_queue_rw_tail(drive,
1971 REQ_IDETAPE_READ, 0,
1972 tape->merge_stage->bh);
1da177e4
LT		 1973 if (bytes_read < 0) {
1974 __idetape_kfree_stage(tape->merge_stage);
1975 tape->merge_stage = NULL;
54abf37e 1976 tape->chrdev_dir = IDETAPE_DIR_NONE;
1da177e4
LT		 1977 return bytes_read;
1978 }
1979 }
1980 }
5e69bd95 1981
42d54689
BP		 1982 if (tape->nr_pending_stages >= 3 * max_stages / 4) {
1983 tape->measure_insert_time = 1;
1984 tape->insert_time = jiffies;
1985 tape->insert_size = 0;
1986 tape->insert_speed = 0;
1da177e4 1987 }
42d54689 1988
1da177e4
LT		 1989 return 0;
1990}
1991
1992/*
3c98bf34
BP		 1993 * Called from idetape_chrdev_read() to service a character device read request
1994 * and add read-ahead requests to our pipeline.
1da177e4 1995 */
5a04cfa9 1996static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1da177e4
LT		 1997{
1998 idetape_tape_t *tape = drive->driver_data;
1da177e4 1999
8004a8c9 2000 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1da177e4 2001
3c98bf34 2002 /* If we are at a filemark, return a read length of 0 */
346331f8 2003 if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
1da177e4
LT		 2004 return 0;
2005
8d06bfad 2006 idetape_init_read(drive, tape->max_stages);
5e69bd95 2007
5e69bd95
BP		 2008 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
2009 tape->merge_stage->bh);
1da177e4
LT		 2010}
2011
5a04cfa9 2012static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1da177e4
LT		 2013{
2014 idetape_tape_t *tape = drive->driver_data;
2015 struct idetape_bh *bh;
2016 int blocks;
3c98bf34 2017
1da177e4
LT		 2018 while (bcount) {
2019 unsigned int count;
2020
2021 bh = tape->merge_stage->bh;
2022 count = min(tape->stage_size, bcount);
2023 bcount -= count;
54bb2074 2024 blocks = count / tape->blk_size;
1da177e4 2025 while (count) {
5a04cfa9
BP		 2026 atomic_set(&bh->b_count,
2027 min(count, (unsigned int)bh->b_size));
1da177e4
LT		 2028 memset(bh->b_data, 0, atomic_read(&bh->b_count));
2029 count -= atomic_read(&bh->b_count);
2030 bh = bh->b_reqnext;
2031 }
5a04cfa9
BP		 2032 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
2033 tape->merge_stage->bh);
1da177e4
LT		 2034 }
2035}
2036
1da177e4 2037/*
3c98bf34
BP		 2038 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
2039 * currently support only one partition.
2040 */
5a04cfa9 2041static int idetape_rewind_tape(ide_drive_t *drive)
1da177e4
LT		 2042{
2043 int retval;
d236d74c 2044 struct ide_atapi_pc pc;
8004a8c9
BP		 2045 idetape_tape_t *tape;
2046 tape = drive->driver_data;
2047
2048 debug_log(DBG_SENSE, "Enter %s\n", __func__);
2049
1da177e4
LT		 2050 idetape_create_rewind_cmd(drive, &pc);
2051 retval = idetape_queue_pc_tail(drive, &pc);
2052 if (retval)
2053 return retval;
2054
2055 idetape_create_read_position_cmd(&pc);
2056 retval = idetape_queue_pc_tail(drive, &pc);
2057 if (retval)
2058 return retval;
2059 return 0;
2060}
2061
3c98bf34 2062/* mtio.h compatible commands should be issued to the chrdev interface. */
5a04cfa9
BP		 2063static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
2064 unsigned long arg)
1da177e4
LT		 2065{
2066 idetape_tape_t *tape = drive->driver_data;
1da177e4
LT		 2067 void __user *argp = (void __user *)arg;
2068
d59823fa
BP		 2069 struct idetape_config {
2070 int dsc_rw_frequency;
2071 int dsc_media_access_frequency;
2072 int nr_stages;
2073 } config;
2074
8004a8c9
BP		 2075 debug_log(DBG_PROCS, "Enter %s\n", __func__);
2076
1da177e4 2077 switch (cmd) {
5a04cfa9
BP		 2078 case 0x0340:
2079 if (copy_from_user(&config, argp, sizeof(config)))
2080 return -EFAULT;
2081 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
2082 tape->max_stages = config.nr_stages;
2083 break;
2084 case 0x0350:
2085 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
2086 config.nr_stages = tape->max_stages;
2087 if (copy_to_user(argp, &config, sizeof(config)))
2088 return -EFAULT;
2089 break;
2090 default:
2091 return -EIO;
1da177e4
LT		 2092 }
2093 return 0;
2094}
2095
5a04cfa9
BP		 2096static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
2097 int mt_count)
1da177e4
LT		 2098{
2099 idetape_tape_t *tape = drive->driver_data;
d236d74c 2100 struct ide_atapi_pc pc;
5a04cfa9 2101 int retval, count = 0;
b6422013 2102 int sprev = !!(tape->caps[4] & 0x20);
1da177e4
LT		 2103
2104 if (mt_count == 0)
2105 return 0;
2106 if (MTBSF == mt_op || MTBSFM == mt_op) {
b6422013 2107 if (!sprev)
1da177e4 2108 return -EIO;
5a04cfa9 2109 mt_count = -mt_count;
1da177e4
LT		 2110 }
2111
54abf37e 2112 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1da177e4 2113 tape->merge_stage_size = 0;
346331f8 2114 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
1da177e4 2115 ++count;
1da177e4
LT		 2116 idetape_discard_read_pipeline(drive, 0);
2117 }
2118
2119 /*
3c98bf34
BP		 2120 * The filemark was not found in our internal pipeline; now we can issue
2121 * the space command.
1da177e4
LT		 2122 */
2123 switch (mt_op) {
5a04cfa9
BP		 2124 case MTFSF:
2125 case MTBSF:
2126 idetape_create_space_cmd(&pc, mt_count - count,
2127 IDETAPE_SPACE_OVER_FILEMARK);
2128 return idetape_queue_pc_tail(drive, &pc);
2129 case MTFSFM:
2130 case MTBSFM:
2131 if (!sprev)
2132 return -EIO;
2133 retval = idetape_space_over_filemarks(drive, MTFSF,
2134 mt_count - count);
2135 if (retval)
2136 return retval;
2137 count = (MTBSFM == mt_op ? 1 : -1);
2138 return idetape_space_over_filemarks(drive, MTFSF, count);
2139 default:
2140 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
2141 mt_op);
2142 return -EIO;
1da177e4
LT		 2143 }
2144}
2145
1da177e4 2146/*
3c98bf34 2147 * Our character device read / write functions.
1da177e4 2148 *
3c98bf34
BP		 2149 * The tape is optimized to maximize throughput when it is transferring an
2150 * integral number of the "continuous transfer limit", which is a parameter of
2151 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1da177e4 2152 *
3c98bf34
BP		 2153 * As of version 1.3 of the driver, the character device provides an abstract
2154 * continuous view of the media - any mix of block sizes (even 1 byte) on the
2155 * same backup/restore procedure is supported. The driver will internally
2156 * convert the requests to the recommended transfer unit, so that an unmatch
2157 * between the user's block size to the recommended size will only result in a
2158 * (slightly) increased driver overhead, but will no longer hit performance.
2159 * This is not applicable to Onstream.
1da177e4 2160 */
5a04cfa9
BP		 2161static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
2162 size_t count, loff_t *ppos)
1da177e4
LT		 2163{
2164 struct ide_tape_obj *tape = ide_tape_f(file);
2165 ide_drive_t *drive = tape->drive;
5a04cfa9 2166 ssize_t bytes_read, temp, actually_read = 0, rc;
dcd96379 2167 ssize_t ret = 0;
b6422013 2168 u16 ctl = *(u16 *)&tape->caps[12];
1da177e4 2169
8004a8c9 2170 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1da177e4 2171
54abf37e 2172 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
346331f8 2173 if (test_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags))
54bb2074
BP		 2174 if (count > tape->blk_size &&
2175 (count % tape->blk_size) == 0)
2176 tape->user_bs_factor = count / tape->blk_size;
1da177e4 2177 }
8d06bfad
BP		 2178 rc = idetape_init_read(drive, tape->max_stages);
2179 if (rc < 0)
1da177e4
LT		 2180 return rc;
2181 if (count == 0)
2182 return (0);
2183 if (tape->merge_stage_size) {
5a04cfa9
BP		 2184 actually_read = min((unsigned int)(tape->merge_stage_size),
2185 (unsigned int)count);
99d74e61 2186 if (idetape_copy_stage_to_user(tape, buf, actually_read))
dcd96379 2187 ret = -EFAULT;
1da177e4
LT		 2188 buf += actually_read;
2189 tape->merge_stage_size -= actually_read;
2190 count -= actually_read;
2191 }
2192 while (count >= tape->stage_size) {
b6422013 2193 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1da177e4
LT		 2194 if (bytes_read <= 0)
2195 goto finish;
99d74e61 2196 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
dcd96379 2197 ret = -EFAULT;
1da177e4
LT		 2198 buf += bytes_read;
2199 count -= bytes_read;
2200 actually_read += bytes_read;
2201 }
2202 if (count) {
b6422013 2203 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1da177e4
LT		 2204 if (bytes_read <= 0)
2205 goto finish;
2206 temp = min((unsigned long)count, (unsigned long)bytes_read);
99d74e61 2207 if (idetape_copy_stage_to_user(tape, buf, temp))
dcd96379 2208 ret = -EFAULT;
1da177e4
LT		 2209 actually_read += temp;
2210 tape->merge_stage_size = bytes_read-temp;
2211 }
2212finish:
346331f8 2213 if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) {
8004a8c9
BP		 2214 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
2215
1da177e4
LT		 2216 idetape_space_over_filemarks(drive, MTFSF, 1);
2217 return 0;
2218 }
dcd96379 2219
5a04cfa9 2220 return ret ? ret : actually_read;
1da177e4
LT		 2221}
2222
5a04cfa9 2223static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1da177e4
LT		 2224 size_t count, loff_t *ppos)
2225{
2226 struct ide_tape_obj *tape = ide_tape_f(file);
2227 ide_drive_t *drive = tape->drive;
dcd96379
DW		 2228 ssize_t actually_written = 0;
2229 ssize_t ret = 0;
b6422013 2230 u16 ctl = *(u16 *)&tape->caps[12];
1da177e4
LT		 2231
2232 /* The drive is write protected. */
2233 if (tape->write_prot)
2234 return -EACCES;
2235
8004a8c9 2236 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1da177e4
LT		 2237
2238 /* Initialize write operation */
54abf37e
BP		 2239 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
2240 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1da177e4 2241 idetape_discard_read_pipeline(drive, 1);
1da177e4
LT		 2242 if (tape->merge_stage || tape->merge_stage_size) {
2243 printk(KERN_ERR "ide-tape: merge_stage_size "
2244 "should be 0 now\n");
2245 tape->merge_stage_size = 0;
2246 }
5a04cfa9
BP		 2247 tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0);
2248 if (!tape->merge_stage)
1da177e4 2249 return -ENOMEM;
54abf37e 2250 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1da177e4
LT		 2251 idetape_init_merge_stage(tape);
2252
2253 /*
3c98bf34
BP		 2254 * Issue a write 0 command to ensure that DSC handshake is
2255 * switched from completion mode to buffer available mode. No
2256 * point in issuing this if DSC overlap isn't supported, some
2257 * drives (Seagate STT3401A) will return an error.
1da177e4
LT		 2258 */
2259 if (drive->dsc_overlap) {
5a04cfa9
BP		 2260 ssize_t retval = idetape_queue_rw_tail(drive,
2261 REQ_IDETAPE_WRITE, 0,
2262 tape->merge_stage->bh);
1da177e4
LT		 2263 if (retval < 0) {
2264 __idetape_kfree_stage(tape->merge_stage);
2265 tape->merge_stage = NULL;
54abf37e 2266 tape->chrdev_dir = IDETAPE_DIR_NONE;
1da177e4
LT		 2267 return retval;
2268 }
2269 }
2270 }
2271 if (count == 0)
2272 return (0);
1da177e4 2273 if (tape->merge_stage_size) {
1da177e4 2274 if (tape->merge_stage_size >= tape->stage_size) {
5a04cfa9 2275 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1da177e4
LT		 2276 tape->merge_stage_size = 0;
2277 }
5a04cfa9
BP		 2278 actually_written = min((unsigned int)
2279 (tape->stage_size - tape->merge_stage_size),
2280 (unsigned int)count);
8646c88f 2281 if (idetape_copy_stage_from_user(tape, buf, actually_written))
dcd96379 2282 ret = -EFAULT;
1da177e4
LT		 2283 buf += actually_written;
2284 tape->merge_stage_size += actually_written;
2285 count -= actually_written;
2286
2287 if (tape->merge_stage_size == tape->stage_size) {
dcd96379 2288 ssize_t retval;
1da177e4 2289 tape->merge_stage_size = 0;
b6422013 2290 retval = idetape_add_chrdev_write_request(drive, ctl);
1da177e4
LT		 2291 if (retval <= 0)
2292 return (retval);
2293 }
2294 }
2295 while (count >= tape->stage_size) {
dcd96379 2296 ssize_t retval;
8646c88f 2297 if (idetape_copy_stage_from_user(tape, buf, tape->stage_size))
dcd96379 2298 ret = -EFAULT;
1da177e4
LT		 2299 buf += tape->stage_size;
2300 count -= tape->stage_size;
b6422013 2301 retval = idetape_add_chrdev_write_request(drive, ctl);
1da177e4
LT		 2302 actually_written += tape->stage_size;
2303 if (retval <= 0)
2304 return (retval);
2305 }
2306 if (count) {
2307 actually_written += count;
8646c88f 2308 if (idetape_copy_stage_from_user(tape, buf, count))
dcd96379 2309 ret = -EFAULT;
1da177e4
LT		 2310 tape->merge_stage_size += count;
2311 }
5a04cfa9 2312 return ret ? ret : actually_written;
1da177e4
LT		 2313}
2314
5a04cfa9 2315static int idetape_write_filemark(ide_drive_t *drive)
1da177e4 2316{
d236d74c 2317 struct ide_atapi_pc pc;
1da177e4
LT		 2318
2319 /* Write a filemark */
2320 idetape_create_write_filemark_cmd(drive, &pc, 1);
2321 if (idetape_queue_pc_tail(drive, &pc)) {
2322 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
2323 return -EIO;
2324 }
2325 return 0;
2326}
2327
2328/*
d99c9da2
BP		 2329 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
2330 * requested.
1da177e4 2331 *
d99c9da2
BP		 2332 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
2333 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
2334 * usually not supported (it is supported in the rare case in which we crossed
2335 * the filemark during our read-ahead pipelined operation mode).
1da177e4 2336 *
d99c9da2 2337 * The following commands are currently not supported:
1da177e4 2338 *
d99c9da2
BP		 2339 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
2340 * MT_ST_WRITE_THRESHOLD.
1da177e4 2341 */
d99c9da2 2342static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1da177e4
LT		 2343{
2344 idetape_tape_t *tape = drive->driver_data;
d236d74c 2345 struct ide_atapi_pc pc;
5a04cfa9 2346 int i, retval;
1da177e4 2347
8004a8c9
BP		 2348 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
2349 mt_op, mt_count);
5a04cfa9 2350
3c98bf34 2351 /* Commands which need our pipelined read-ahead stages. */
1da177e4 2352 switch (mt_op) {
5a04cfa9
BP		 2353 case MTFSF:
2354 case MTFSFM:
2355 case MTBSF:
2356 case MTBSFM:
2357 if (!mt_count)
2358 return 0;
2359 return idetape_space_over_filemarks(drive, mt_op, mt_count);
2360 default:
2361 break;
1da177e4 2362 }
5a04cfa9 2363
1da177e4 2364 switch (mt_op) {
5a04cfa9
BP		 2365 case MTWEOF:
2366 if (tape->write_prot)
2367 return -EACCES;
2368 idetape_discard_read_pipeline(drive, 1);
2369 for (i = 0; i < mt_count; i++) {
2370 retval = idetape_write_filemark(drive);
2371 if (retval)
2372 return retval;
2373 }
2374 return 0;
2375 case MTREW:
2376 idetape_discard_read_pipeline(drive, 0);
2377 if (idetape_rewind_tape(drive))
2378 return -EIO;
2379 return 0;
2380 case MTLOAD:
2381 idetape_discard_read_pipeline(drive, 0);
2382 idetape_create_load_unload_cmd(drive, &pc,
2383 IDETAPE_LU_LOAD_MASK);
2384 return idetape_queue_pc_tail(drive, &pc);
2385 case MTUNLOAD:
2386 case MTOFFL:
2387 /*
2388 * If door is locked, attempt to unlock before
2389 * attempting to eject.
2390 */
2391 if (tape->door_locked) {
2392 if (idetape_create_prevent_cmd(drive, &pc, 0))
2393 if (!idetape_queue_pc_tail(drive, &pc))
2394 tape->door_locked = DOOR_UNLOCKED;
2395 }
2396 idetape_discard_read_pipeline(drive, 0);
2397 idetape_create_load_unload_cmd(drive, &pc,
2398 !IDETAPE_LU_LOAD_MASK);
2399 retval = idetape_queue_pc_tail(drive, &pc);
2400 if (!retval)
346331f8 2401 clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags);
5a04cfa9
BP		 2402 return retval;
2403 case MTNOP:
2404 idetape_discard_read_pipeline(drive, 0);
2405 return idetape_flush_tape_buffers(drive);
2406 case MTRETEN:
2407 idetape_discard_read_pipeline(drive, 0);
2408 idetape_create_load_unload_cmd(drive, &pc,
2409 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
2410 return idetape_queue_pc_tail(drive, &pc);
2411 case MTEOM:
2412 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
2413 return idetape_queue_pc_tail(drive, &pc);
2414 case MTERASE:
2415 (void)idetape_rewind_tape(drive);
2416 idetape_create_erase_cmd(&pc);
2417 return idetape_queue_pc_tail(drive, &pc);
2418 case MTSETBLK:
2419 if (mt_count) {
2420 if (mt_count < tape->blk_size ||
2421 mt_count % tape->blk_size)
1da177e4 2422 return -EIO;
5a04cfa9 2423 tape->user_bs_factor = mt_count / tape->blk_size;
346331f8 2424 clear_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags);
5a04cfa9 2425 } else
346331f8 2426 set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags);
5a04cfa9
BP		 2427 return 0;
2428 case MTSEEK:
2429 idetape_discard_read_pipeline(drive, 0);
2430 return idetape_position_tape(drive,
2431 mt_count * tape->user_bs_factor, tape->partition, 0);
2432 case MTSETPART:
2433 idetape_discard_read_pipeline(drive, 0);
2434 return idetape_position_tape(drive, 0, mt_count, 0);
2435 case MTFSR:
2436 case MTBSR:
2437 case MTLOCK:
2438 if (!idetape_create_prevent_cmd(drive, &pc, 1))
1da177e4 2439 return 0;
5a04cfa9
BP		 2440 retval = idetape_queue_pc_tail(drive, &pc);
2441 if (retval)
1da177e4 2442 return retval;
5a04cfa9
BP		 2443 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
2444 return 0;
2445 case MTUNLOCK:
2446 if (!idetape_create_prevent_cmd(drive, &pc, 0))
1da177e4 2447 return 0;
5a04cfa9
BP		 2448 retval = idetape_queue_pc_tail(drive, &pc);
2449 if (retval)
2450 return retval;
2451 tape->door_locked = DOOR_UNLOCKED;
2452 return 0;
2453 default:
2454 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
2455 mt_op);
2456 return -EIO;
1da177e4
LT		 2457 }
2458}
2459
2460/*
d99c9da2
BP		 2461 * Our character device ioctls. General mtio.h magnetic io commands are
2462 * supported here, and not in the corresponding block interface. Our own
2463 * ide-tape ioctls are supported on both interfaces.
1da177e4 2464 */
d99c9da2
BP		 2465static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
2466 unsigned int cmd, unsigned long arg)
1da177e4
LT		 2467{
2468 struct ide_tape_obj *tape = ide_tape_f(file);
2469 ide_drive_t *drive = tape->drive;
2470 struct mtop mtop;
2471 struct mtget mtget;
2472 struct mtpos mtpos;
54bb2074 2473 int block_offset = 0, position = tape->first_frame;
1da177e4
LT		 2474 void __user *argp = (void __user *)arg;
2475
8004a8c9 2476 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
1da177e4 2477
54abf37e 2478 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1da177e4
LT		 2479 idetape_empty_write_pipeline(drive);
2480 idetape_flush_tape_buffers(drive);
2481 }
2482 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
b361acb1 2483 block_offset = tape->merge_stage_size /
54bb2074 2484 (tape->blk_size * tape->user_bs_factor);
5a04cfa9
BP		 2485 position = idetape_read_position(drive);
2486 if (position < 0)
1da177e4
LT		 2487 return -EIO;
2488 }
2489 switch (cmd) {
5a04cfa9
BP		 2490 case MTIOCTOP:
2491 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
2492 return -EFAULT;
2493 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
2494 case MTIOCGET:
2495 memset(&mtget, 0, sizeof(struct mtget));
2496 mtget.mt_type = MT_ISSCSI2;
2497 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
2498 mtget.mt_dsreg =
2499 ((tape->blk_size * tape->user_bs_factor)
2500 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
2501
2502 if (tape->drv_write_prot)
2503 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
2504
2505 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
2506 return -EFAULT;
2507 return 0;
2508 case MTIOCPOS:
2509 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
2510 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
2511 return -EFAULT;
2512 return 0;
2513 default:
2514 if (tape->chrdev_dir == IDETAPE_DIR_READ)
2515 idetape_discard_read_pipeline(drive, 1);
2516 return idetape_blkdev_ioctl(drive, cmd, arg);
1da177e4
LT		 2517 }
2518}
2519
3cffb9ce
BP		 2520/*
2521 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
2522 * block size with the reported value.
2523 */
2524static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
2525{
2526 idetape_tape_t *tape = drive->driver_data;
d236d74c 2527 struct ide_atapi_pc pc;
3cffb9ce
BP		 2528
2529 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
2530 if (idetape_queue_pc_tail(drive, &pc)) {
2531 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
54bb2074 2532 if (tape->blk_size == 0) {
3cffb9ce
BP		 2533 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
2534 "block size, assuming 32k\n");
54bb2074 2535 tape->blk_size = 32768;
3cffb9ce
BP		 2536 }
2537 return;
2538 }
d236d74c
BP		 2539 tape->blk_size = (pc.buf[4 + 5] << 16) +
2540 (pc.buf[4 + 6] << 8) +
2541 pc.buf[4 + 7];
2542 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
3cffb9ce 2543}
1da177e4 2544
5a04cfa9 2545static int idetape_chrdev_open(struct inode *inode, struct file *filp)
1da177e4
LT		 2546{
2547 unsigned int minor = iminor(inode), i = minor & ~0xc0;
2548 ide_drive_t *drive;
2549 idetape_tape_t *tape;
d236d74c 2550 struct ide_atapi_pc pc;
1da177e4
LT		 2551 int retval;
2552
8004a8c9
BP		 2553 if (i >= MAX_HWIFS * MAX_DRIVES)
2554 return -ENXIO;
2555
2556 tape = ide_tape_chrdev_get(i);
2557 if (!tape)
2558 return -ENXIO;
2559
2560 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2561
1da177e4
LT		 2562 /*
2563 * We really want to do nonseekable_open(inode, filp); here, but some
2564 * versions of tar incorrectly call lseek on tapes and bail out if that
2565 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2566 */
2567 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
2568
1da177e4
LT		 2569 drive = tape->drive;
2570
2571 filp->private_data = tape;
2572
346331f8 2573 if (test_and_set_bit(IDETAPE_FLAG_BUSY, &tape->flags)) {
1da177e4
LT		 2574 retval = -EBUSY;
2575 goto out_put_tape;
2576 }
2577
2578 retval = idetape_wait_ready(drive, 60 * HZ);
2579 if (retval) {
346331f8 2580 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
1da177e4
LT		 2581 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
2582 goto out_put_tape;
2583 }
2584
2585 idetape_read_position(drive);
346331f8 2586 if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags))
1da177e4
LT		 2587 (void)idetape_rewind_tape(drive);
2588
1da177e4 2589 /* Read block size and write protect status from drive. */
3cffb9ce 2590 ide_tape_get_bsize_from_bdesc(drive);
1da177e4
LT		 2591
2592 /* Set write protect flag if device is opened as read-only. */
2593 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
2594 tape->write_prot = 1;
2595 else
2596 tape->write_prot = tape->drv_write_prot;
2597
2598 /* Make sure drive isn't write protected if user wants to write. */
2599 if (tape->write_prot) {
2600 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
2601 (filp->f_flags & O_ACCMODE) == O_RDWR) {
346331f8 2602 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
1da177e4
LT		 2603 retval = -EROFS;
2604 goto out_put_tape;
2605 }
2606 }
2607
3c98bf34 2608 /* Lock the tape drive door so user can't eject. */
54abf37e 2609 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1da177e4
LT		 2610 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
2611 if (!idetape_queue_pc_tail(drive, &pc)) {
2612 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2613 tape->door_locked = DOOR_LOCKED;
2614 }
2615 }
2616 }
1da177e4
LT		 2617 return 0;
2618
2619out_put_tape:
2620 ide_tape_put(tape);
2621 return retval;
2622}
2623
5a04cfa9 2624static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
1da177e4
LT		 2625{
2626 idetape_tape_t *tape = drive->driver_data;
2627
2628 idetape_empty_write_pipeline(drive);
2629 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
2630 if (tape->merge_stage != NULL) {
54bb2074
BP		 2631 idetape_pad_zeros(drive, tape->blk_size *
2632 (tape->user_bs_factor - 1));
1da177e4
LT		 2633 __idetape_kfree_stage(tape->merge_stage);
2634 tape->merge_stage = NULL;
2635 }
2636 idetape_write_filemark(drive);
2637 idetape_flush_tape_buffers(drive);
2638 idetape_flush_tape_buffers(drive);
2639}
2640
5a04cfa9 2641static int idetape_chrdev_release(struct inode *inode, struct file *filp)
1da177e4
LT		 2642{
2643 struct ide_tape_obj *tape = ide_tape_f(filp);
2644 ide_drive_t *drive = tape->drive;
d236d74c 2645 struct ide_atapi_pc pc;
1da177e4
LT		 2646 unsigned int minor = iminor(inode);
2647
2648 lock_kernel();
2649 tape = drive->driver_data;
8004a8c9
BP		 2650
2651 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1da177e4 2652
54abf37e 2653 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1da177e4 2654 idetape_write_release(drive, minor);
54abf37e 2655 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1da177e4
LT		 2656 if (minor < 128)
2657 idetape_discard_read_pipeline(drive, 1);
1da177e4 2658 }
f64eee7b 2659
346331f8 2660 if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags))
1da177e4 2661 (void) idetape_rewind_tape(drive);
54abf37e 2662 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
1da177e4
LT		 2663 if (tape->door_locked == DOOR_LOCKED) {
2664 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
2665 if (!idetape_queue_pc_tail(drive, &pc))
2666 tape->door_locked = DOOR_UNLOCKED;
2667 }
2668 }
2669 }
346331f8 2670 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags);
1da177e4
LT		 2671 ide_tape_put(tape);
2672 unlock_kernel();
2673 return 0;
2674}
2675
2676/*
71071b8e 2677 * check the contents of the ATAPI IDENTIFY command results. We return:
1da177e4 2678 *
71071b8e
BP		 2679 * 1 - If the tape can be supported by us, based on the information we have so
2680 * far.
1da177e4 2681 *
71071b8e 2682 * 0 - If this tape driver is not currently supported by us.
1da177e4 2683 */
71071b8e 2684static int idetape_identify_device(ide_drive_t *drive)
1da177e4 2685{
71071b8e 2686 u8 gcw[2], protocol, device_type, removable, packet_size;
1da177e4
LT		 2687
2688 if (drive->id_read == 0)
2689 return 1;
2690
71071b8e 2691 *((unsigned short *) &gcw) = drive->id->config;
1da177e4 2692
71071b8e
BP		 2693 protocol = (gcw[1] & 0xC0) >> 6;
2694 device_type = gcw[1] & 0x1F;
2695 removable = !!(gcw[0] & 0x80);
2696 packet_size = gcw[0] & 0x3;
1da177e4 2697
71071b8e
BP		 2698 /* Check that we can support this device */
2699 if (protocol != 2)
16422de3 2700 printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n",
71071b8e
BP		 2701 protocol);
2702 else if (device_type != 1)
16422de3 2703 printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set "
71071b8e
BP		 2704 "to tape\n", device_type);
2705 else if (!removable)
1da177e4 2706 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
71071b8e 2707 else if (packet_size != 0) {
24d57f8b
BP		 2708 printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12"
2709 " bytes\n", packet_size);
1da177e4
LT		 2710 } else
2711 return 1;
2712 return 0;
2713}
2714
6d29c8f0 2715static void idetape_get_inquiry_results(ide_drive_t *drive)
1da177e4 2716{
1da177e4 2717 idetape_tape_t *tape = drive->driver_data;
d236d74c 2718 struct ide_atapi_pc pc;
41f81d54 2719 char fw_rev[6], vendor_id[10], product_id[18];
6d29c8f0 2720
1da177e4
LT		 2721 idetape_create_inquiry_cmd(&pc);
2722 if (idetape_queue_pc_tail(drive, &pc)) {
6d29c8f0
BP		 2723 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2724 tape->name);
1da177e4
LT		 2725 return;
2726 }
d236d74c
BP		 2727 memcpy(vendor_id, &pc.buf[8], 8);
2728 memcpy(product_id, &pc.buf[16], 16);
2729 memcpy(fw_rev, &pc.buf[32], 4);
41f81d54
BP		 2730
2731 ide_fixstring(vendor_id, 10, 0);
2732 ide_fixstring(product_id, 18, 0);
2733 ide_fixstring(fw_rev, 6, 0);
2734
6d29c8f0 2735 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n",
41f81d54 2736 drive->name, tape->name, vendor_id, product_id, fw_rev);
1da177e4
LT		 2737}
2738
2739/*
b6422013
BP		 2740 * Ask the tape about its various parameters. In particular, we will adjust our
2741 * data transfer buffer size to the recommended value as returned by the tape.
1da177e4 2742 */
5a04cfa9 2743static void idetape_get_mode_sense_results(ide_drive_t *drive)
1da177e4
LT		 2744{
2745 idetape_tape_t *tape = drive->driver_data;
d236d74c 2746 struct ide_atapi_pc pc;
b6422013
BP		 2747 u8 *caps;
2748 u8 speed, max_speed;
47314fa4 2749
1da177e4
LT		 2750 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2751 if (idetape_queue_pc_tail(drive, &pc)) {
b6422013
BP		 2752 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2753 " some default values\n");
54bb2074 2754 tape->blk_size = 512;
b6422013
BP		 2755 put_unaligned(52, (u16 *)&tape->caps[12]);
2756 put_unaligned(540, (u16 *)&tape->caps[14]);
2757 put_unaligned(6*52, (u16 *)&tape->caps[16]);
1da177e4
LT		 2758 return;
2759 }
d236d74c 2760 caps = pc.buf + 4 + pc.buf[3];
b6422013
BP		 2761
2762 /* convert to host order and save for later use */
2763 speed = be16_to_cpu(*(u16 *)&caps[14]);
2764 max_speed = be16_to_cpu(*(u16 *)&caps[8]);
1da177e4 2765
b6422013
BP		 2766 put_unaligned(max_speed, (u16 *)&caps[8]);
2767 put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]);
2768 put_unaligned(speed, (u16 *)&caps[14]);
2769 put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]);
1da177e4 2770
b6422013
BP		 2771 if (!speed) {
2772 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2773 "(assuming 650KB/sec)\n", drive->name);
2774 put_unaligned(650, (u16 *)&caps[14]);
1da177e4 2775 }
b6422013
BP		 2776 if (!max_speed) {
2777 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2778 "(assuming 650KB/sec)\n", drive->name);
2779 put_unaligned(650, (u16 *)&caps[8]);
1da177e4
LT		 2780 }
2781
b6422013
BP		 2782 memcpy(&tape->caps, caps, 20);
2783 if (caps[7] & 0x02)
54bb2074 2784 tape->blk_size = 512;
b6422013 2785 else if (caps[7] & 0x04)
54bb2074 2786 tape->blk_size = 1024;
1da177e4
LT		 2787}
2788
7662d046 2789#ifdef CONFIG_IDE_PROC_FS
5a04cfa9 2790static void idetape_add_settings(ide_drive_t *drive)
1da177e4
LT		 2791{
2792 idetape_tape_t *tape = drive->driver_data;
2793
b6422013
BP		 2794 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
2795 1, 2, (u16 *)&tape->caps[16], NULL);
5a04cfa9
BP		 2796 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff,
2797 tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
2798 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff,
2799 tape->stage_size / 1024, 1, &tape->max_stages, NULL);
2800 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff,
2801 tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
2802 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0,
2803 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages,
2804 NULL);
2805 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0,
2806 0xffff, tape->stage_size / 1024, 1,
2807 &tape->nr_pending_stages, NULL);
b6422013
BP		 2808 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
2809 1, 1, (u16 *)&tape->caps[14], NULL);
54bb2074
BP		 2810 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1,
2811 1024, &tape->stage_size, NULL);
2812 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN,
2813 IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq,
2814 NULL);
5a04cfa9
BP		 2815 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1,
2816 1, &drive->dsc_overlap, NULL);
5a04cfa9
BP		 2817 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff,
2818 1, 1, &tape->avg_speed, NULL);
8004a8c9
BP		 2819 ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1,
2820 1, &tape->debug_mask, NULL);
1da177e4 2821}
7662d046
BZ		 2822#else
2823static inline void idetape_add_settings(ide_drive_t *drive) { ; }
2824#endif
1da177e4
LT		 2825
2826/*
3c98bf34 2827 * The function below is called to:
1da177e4 2828 *
3c98bf34
BP		 2829 * 1. Initialize our various state variables.
2830 * 2. Ask the tape for its capabilities.
2831 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2832 * is chosen based on the recommendation which we received in step 2.
1da177e4 2833 *
3c98bf34
BP		 2834 * Note that at this point ide.c already assigned us an irq, so that we can
2835 * queue requests here and wait for their completion.
1da177e4 2836 */
5a04cfa9 2837static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
1da177e4
LT		 2838{
2839 unsigned long t1, tmid, tn, t;
2840 int speed;
1da177e4 2841 int stage_size;
71071b8e 2842 u8 gcw[2];
1da177e4 2843 struct sysinfo si;
b6422013 2844 u16 *ctl = (u16 *)&tape->caps[12];
1da177e4 2845
54bb2074 2846 spin_lock_init(&tape->lock);
1da177e4 2847 drive->dsc_overlap = 1;
4166c199
BZ		 2848 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2849 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2850 tape->name);
2851 drive->dsc_overlap = 0;
1da177e4 2852 }
1da177e4
LT		 2853 /* Seagate Travan drives do not support DSC overlap. */
2854 if (strstr(drive->id->model, "Seagate STT3401"))
2855 drive->dsc_overlap = 0;
2856 tape->minor = minor;
2857 tape->name[0] = 'h';
2858 tape->name[1] = 't';
2859 tape->name[2] = '0' + minor;
54abf37e 2860 tape->chrdev_dir = IDETAPE_DIR_NONE;
1da177e4 2861 tape->pc = tape->pc_stack;
1da177e4 2862 *((unsigned short *) &gcw) = drive->id->config;
71071b8e
BP		 2863
2864 /* Command packet DRQ type */
2865 if (((gcw[0] & 0x60) >> 5) == 1)
346331f8 2866 set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags);
1da177e4 2867
5a04cfa9
BP		 2868 tape->min_pipeline = 10;
2869 tape->max_pipeline = 10;
2870 tape->max_stages = 10;
3c98bf34 2871
1da177e4
LT		 2872 idetape_get_inquiry_results(drive);
2873 idetape_get_mode_sense_results(drive);
3cffb9ce 2874 ide_tape_get_bsize_from_bdesc(drive);
1da177e4 2875 tape->user_bs_factor = 1;
54bb2074 2876 tape->stage_size = *ctl * tape->blk_size;
1da177e4
LT		 2877 while (tape->stage_size > 0xffff) {
2878 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
b6422013 2879 *ctl /= 2;
54bb2074 2880 tape->stage_size = *ctl * tape->blk_size;
1da177e4
LT		 2881 }
2882 stage_size = tape->stage_size;
2883 tape->pages_per_stage = stage_size / PAGE_SIZE;
2884 if (stage_size % PAGE_SIZE) {
2885 tape->pages_per_stage++;
2886 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
2887 }
2888
b6422013
BP		 2889 /* Select the "best" DSC read/write polling freq and pipeline size. */
2890 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
1da177e4
LT		 2891
2892 tape->max_stages = speed * 1000 * 10 / tape->stage_size;
2893
3c98bf34 2894 /* Limit memory use for pipeline to 10% of physical memory */
1da177e4 2895 si_meminfo(&si);
5a04cfa9
BP		 2896 if (tape->max_stages * tape->stage_size >
2897 si.totalram * si.mem_unit / 10)
2898 tape->max_stages =
2899 si.totalram * si.mem_unit / (10 * tape->stage_size);
2900
1da177e4
LT		 2901 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
2902 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
5a04cfa9
BP		 2903 tape->max_pipeline =
2904 min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
2905 if (tape->max_stages == 0) {
2906 tape->max_stages = 1;
2907 tape->min_pipeline = 1;
2908 tape->max_pipeline = 1;
2909 }
1da177e4
LT		 2910
2911 t1 = (tape->stage_size * HZ) / (speed * 1000);
b6422013 2912 tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125);
1da177e4
LT		 2913 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
2914
2915 if (tape->max_stages)
2916 t = tn;
2917 else
2918 t = t1;
2919
2920 /*
3c98bf34
BP		 2921 * Ensure that the number we got makes sense; limit it within
2922 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
1da177e4 2923 */
54bb2074
BP		 2924 tape->best_dsc_rw_freq = max_t(unsigned long,
2925 min_t(unsigned long, t, IDETAPE_DSC_RW_MAX),
2926 IDETAPE_DSC_RW_MIN);
1da177e4
LT		 2927 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2928 "%dkB pipeline, %lums tDSC%s\n",
b6422013
BP		 2929 drive->name, tape->name, *(u16 *)&tape->caps[14],
2930 (*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
1da177e4
LT		 2931 tape->stage_size / 1024,
2932 tape->max_stages * tape->stage_size / 1024,
54bb2074 2933 tape->best_dsc_rw_freq * 1000 / HZ,
1da177e4
LT		 2934 drive->using_dma ? ", DMA":"");
2935
2936 idetape_add_settings(drive);
2937}
2938
4031bbe4 2939static void ide_tape_remove(ide_drive_t *drive)
1da177e4
LT		 2940{
2941 idetape_tape_t *tape = drive->driver_data;
1da177e4 2942
7662d046 2943 ide_proc_unregister_driver(drive, tape->driver);
1da177e4
LT		 2944
2945 ide_unregister_region(tape->disk);
2946
2947 ide_tape_put(tape);
1da177e4
LT		 2948}
2949
2950static void ide_tape_release(struct kref *kref)
2951{
2952 struct ide_tape_obj *tape = to_ide_tape(kref);
2953 ide_drive_t *drive = tape->drive;
2954 struct gendisk *g = tape->disk;
2955
8604affd
BZ		 2956 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
2957
1da177e4
LT		 2958 drive->dsc_overlap = 0;
2959 drive->driver_data = NULL;
dbc1272e 2960 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
5a04cfa9
BP		 2961 device_destroy(idetape_sysfs_class,
2962 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
1da177e4
LT		 2963 idetape_devs[tape->minor] = NULL;
2964 g->private_data = NULL;
2965 put_disk(g);
2966 kfree(tape);
2967}
2968
ecfd80e4 2969#ifdef CONFIG_IDE_PROC_FS
1da177e4
LT		 2970static int proc_idetape_read_name
2971 (char *page, char **start, off_t off, int count, int *eof, void *data)
2972{
2973 ide_drive_t *drive = (ide_drive_t *) data;
2974 idetape_tape_t *tape = drive->driver_data;
2975 char *out = page;
2976 int len;
2977
2978 len = sprintf(out, "%s\n", tape->name);
2979 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2980}
2981
2982static ide_proc_entry_t idetape_proc[] = {
2983 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2984 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2985 { NULL, 0, NULL, NULL }
2986};
1da177e4
LT		 2987#endif
2988
4031bbe4 2989static int ide_tape_probe(ide_drive_t *);
1da177e4 2990
1da177e4 2991static ide_driver_t idetape_driver = {
8604affd 2992 .gen_driver = {
4ef3b8f4 2993 .owner = THIS_MODULE,
8604affd
BZ		 2994 .name = "ide-tape",
2995 .bus = &ide_bus_type,
8604affd 2996 },
4031bbe4
RK		 2997 .probe = ide_tape_probe,
2998 .remove = ide_tape_remove,
1da177e4
LT		 2999 .version = IDETAPE_VERSION,
3000 .media = ide_tape,
1da177e4 3001 .supports_dsc_overlap = 1,
1da177e4
LT		 3002 .do_request = idetape_do_request,
3003 .end_request = idetape_end_request,
3004 .error = __ide_error,
3005 .abort = __ide_abort,
7662d046 3006#ifdef CONFIG_IDE_PROC_FS
1da177e4 3007 .proc = idetape_proc,
7662d046 3008#endif
1da177e4
LT		 3009};
3010
3c98bf34 3011/* Our character device supporting functions, passed to register_chrdev. */
2b8693c0 3012static const struct file_operations idetape_fops = {
1da177e4
LT		 3013 .owner = THIS_MODULE,
3014 .read = idetape_chrdev_read,
3015 .write = idetape_chrdev_write,
3016 .ioctl = idetape_chrdev_ioctl,
3017 .open = idetape_chrdev_open,
3018 .release = idetape_chrdev_release,
3019};
3020
3021static int idetape_open(struct inode *inode, struct file *filp)
3022{
3023 struct gendisk *disk = inode->i_bdev->bd_disk;
3024 struct ide_tape_obj *tape;
1da177e4 3025
5a04cfa9
BP		 3026 tape = ide_tape_get(disk);
3027 if (!tape)
1da177e4
LT		 3028 return -ENXIO;
3029
1da177e4
LT		 3030 return 0;
3031}
3032
3033static int idetape_release(struct inode *inode, struct file *filp)
3034{
3035 struct gendisk *disk = inode->i_bdev->bd_disk;
3036 struct ide_tape_obj *tape = ide_tape_g(disk);
1da177e4
LT		 3037
3038 ide_tape_put(tape);
3039
3040 return 0;
3041}
3042
3043static int idetape_ioctl(struct inode *inode, struct file *file,
3044 unsigned int cmd, unsigned long arg)
3045{
3046 struct block_device *bdev = inode->i_bdev;
3047 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
3048 ide_drive_t *drive = tape->drive;
3049 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
3050 if (err == -EINVAL)
3051 err = idetape_blkdev_ioctl(drive, cmd, arg);
3052 return err;
3053}
3054
3055static struct block_device_operations idetape_block_ops = {
3056 .owner = THIS_MODULE,
3057 .open = idetape_open,
3058 .release = idetape_release,
3059 .ioctl = idetape_ioctl,
3060};
3061
4031bbe4 3062static int ide_tape_probe(ide_drive_t *drive)
1da177e4
LT		 3063{
3064 idetape_tape_t *tape;
3065 struct gendisk *g;
3066 int minor;
3067
3068 if (!strstr("ide-tape", drive->driver_req))
3069 goto failed;
3070 if (!drive->present)
3071 goto failed;
3072 if (drive->media != ide_tape)
3073 goto failed;
5a04cfa9
BP		 3074 if (!idetape_identify_device(drive)) {
3075 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
3076 " the driver\n", drive->name);
1da177e4
LT		 3077 goto failed;
3078 }
3079 if (drive->scsi) {
5a04cfa9
BP		 3080 printk(KERN_INFO "ide-tape: passing drive %s to ide-scsi"
3081 " emulation.\n", drive->name);
1da177e4
LT		 3082 goto failed;
3083 }
5a04cfa9 3084 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
1da177e4 3085 if (tape == NULL) {
5a04cfa9
BP		 3086 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
3087 drive->name);
1da177e4
LT		 3088 goto failed;
3089 }
3090
3091 g = alloc_disk(1 << PARTN_BITS);
3092 if (!g)
3093 goto out_free_tape;
3094
3095 ide_init_disk(g, drive);
3096
7662d046 3097 ide_proc_register_driver(drive, &idetape_driver);
1da177e4 3098
1da177e4
LT		 3099 kref_init(&tape->kref);
3100
3101 tape->drive = drive;
3102 tape->driver = &idetape_driver;
3103 tape->disk = g;
3104
3105 g->private_data = &tape->driver;
3106
3107 drive->driver_data = tape;
3108
cf8b8975 3109 mutex_lock(&idetape_ref_mutex);
1da177e4
LT		 3110 for (minor = 0; idetape_devs[minor]; minor++)
3111 ;
3112 idetape_devs[minor] = tape;
cf8b8975 3113 mutex_unlock(&idetape_ref_mutex);
1da177e4
LT		 3114
3115 idetape_setup(drive, tape, minor);
3116
dbc1272e
TJ		 3117 device_create(idetape_sysfs_class, &drive->gendev,
3118 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name);
3119 device_create(idetape_sysfs_class, &drive->gendev,
3120 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name);
d5dee80a 3121
1da177e4
LT		 3122 g->fops = &idetape_block_ops;
3123 ide_register_region(g);
3124
3125 return 0;
8604affd 3126
1da177e4
LT		 3127out_free_tape:
3128 kfree(tape);
3129failed:
8604affd 3130 return -ENODEV;
1da177e4
LT		 3131}
3132
5a04cfa9 3133static void __exit idetape_exit(void)
1da177e4 3134{
8604affd 3135 driver_unregister(&idetape_driver.gen_driver);
d5dee80a 3136 class_destroy(idetape_sysfs_class);
1da177e4
LT		 3137 unregister_chrdev(IDETAPE_MAJOR, "ht");
3138}
3139
17514e8a 3140static int __init idetape_init(void)
1da177e4 3141{
d5dee80a
WD		 3142 int error = 1;
3143 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
3144 if (IS_ERR(idetape_sysfs_class)) {
3145 idetape_sysfs_class = NULL;
3146 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
3147 error = -EBUSY;
3148 goto out;
3149 }
3150
1da177e4 3151 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
5a04cfa9
BP		 3152 printk(KERN_ERR "ide-tape: Failed to register chrdev"
3153 " interface\n");
d5dee80a
WD		 3154 error = -EBUSY;
3155 goto out_free_class;
1da177e4 3156 }
d5dee80a
WD		 3157
3158 error = driver_register(&idetape_driver.gen_driver);
3159 if (error)
3160 goto out_free_driver;
3161
3162 return 0;
3163
3164out_free_driver:
3165 driver_unregister(&idetape_driver.gen_driver);
3166out_free_class:
3167 class_destroy(idetape_sysfs_class);
3168out:
3169 return error;
1da177e4
LT		 3170}
3171
263756ec 3172MODULE_ALIAS("ide:*m-tape*");
1da177e4
LT		 3173module_init(idetape_init);
3174module_exit(idetape_exit);
3175MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
9c145768
BP		 3176MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
3177MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)