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[mirror_ubuntu-bionic-kernel.git] / drivers / memstick / core / ms_block.c
1 /*
2 * ms_block.c - Sony MemoryStick (legacy) storage support
3
4 * Copyright (C) 2013 Maxim Levitsky <maximlevitsky@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Minor portions of the driver were copied from mspro_block.c which is
11 * Copyright (C) 2007 Alex Dubov <oakad@yahoo.com>
12 *
13 */
14 #define DRIVER_NAME "ms_block"
15 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
16
17 #include <linux/module.h>
18 #include <linux/blkdev.h>
19 #include <linux/memstick.h>
20 #include <linux/idr.h>
21 #include <linux/hdreg.h>
22 #include <linux/delay.h>
23 #include <linux/slab.h>
24 #include <linux/random.h>
25 #include <linux/bitmap.h>
26 #include <linux/scatterlist.h>
27 #include <linux/jiffies.h>
28 #include <linux/workqueue.h>
29 #include <linux/mutex.h>
30 #include "ms_block.h"
31
32 static int debug;
33 static int cache_flush_timeout = 1000;
34 static bool verify_writes;
35
36 /*
37 * Copies section of 'sg_from' starting from offset 'offset' and with length
38 * 'len' To another scatterlist of to_nents enties
39 */
40 static size_t msb_sg_copy(struct scatterlist *sg_from,
41 struct scatterlist *sg_to, int to_nents, size_t offset, size_t len)
42 {
43 size_t copied = 0;
44
45 while (offset > 0) {
46 if (offset >= sg_from->length) {
47 if (sg_is_last(sg_from))
48 return 0;
49
50 offset -= sg_from->length;
51 sg_from = sg_next(sg_from);
52 continue;
53 }
54
55 copied = min(len, sg_from->length - offset);
56 sg_set_page(sg_to, sg_page(sg_from),
57 copied, sg_from->offset + offset);
58
59 len -= copied;
60 offset = 0;
61
62 if (sg_is_last(sg_from) || !len)
63 goto out;
64
65 sg_to = sg_next(sg_to);
66 to_nents--;
67 sg_from = sg_next(sg_from);
68 }
69
70 while (len > sg_from->length && to_nents--) {
71 len -= sg_from->length;
72 copied += sg_from->length;
73
74 sg_set_page(sg_to, sg_page(sg_from),
75 sg_from->length, sg_from->offset);
76
77 if (sg_is_last(sg_from) || !len)
78 goto out;
79
80 sg_from = sg_next(sg_from);
81 sg_to = sg_next(sg_to);
82 }
83
84 if (len && to_nents) {
85 sg_set_page(sg_to, sg_page(sg_from), len, sg_from->offset);
86 copied += len;
87 }
88 out:
89 sg_mark_end(sg_to);
90 return copied;
91 }
92
93 /*
94 * Compares section of 'sg' starting from offset 'offset' and with length 'len'
95 * to linear buffer of length 'len' at address 'buffer'
96 * Returns 0 if equal and -1 otherwice
97 */
98 static int msb_sg_compare_to_buffer(struct scatterlist *sg,
99 size_t offset, u8 *buffer, size_t len)
100 {
101 int retval = 0, cmplen;
102 struct sg_mapping_iter miter;
103
104 sg_miter_start(&miter, sg, sg_nents(sg),
105 SG_MITER_ATOMIC | SG_MITER_FROM_SG);
106
107 while (sg_miter_next(&miter) && len > 0) {
108 if (offset >= miter.length) {
109 offset -= miter.length;
110 continue;
111 }
112
113 cmplen = min(miter.length - offset, len);
114 retval = memcmp(miter.addr + offset, buffer, cmplen) ? -1 : 0;
115 if (retval)
116 break;
117
118 buffer += cmplen;
119 len -= cmplen;
120 offset = 0;
121 }
122
123 if (!retval && len)
124 retval = -1;
125
126 sg_miter_stop(&miter);
127 return retval;
128 }
129
130
131 /* Get zone at which block with logical address 'lba' lives
132 * Flash is broken into zones.
133 * Each zone consists of 512 eraseblocks, out of which in first
134 * zone 494 are used and 496 are for all following zones.
135 * Therefore zone #0 hosts blocks 0-493, zone #1 blocks 494-988, etc...
136 */
137 static int msb_get_zone_from_lba(int lba)
138 {
139 if (lba < 494)
140 return 0;
141 return ((lba - 494) / 496) + 1;
142 }
143
144 /* Get zone of physical block. Trivial */
145 static int msb_get_zone_from_pba(int pba)
146 {
147 return pba / MS_BLOCKS_IN_ZONE;
148 }
149
150 /* Debug test to validate free block counts */
151 static int msb_validate_used_block_bitmap(struct msb_data *msb)
152 {
153 int total_free_blocks = 0;
154 int i;
155
156 if (!debug)
157 return 0;
158
159 for (i = 0; i < msb->zone_count; i++)
160 total_free_blocks += msb->free_block_count[i];
161
162 if (msb->block_count - bitmap_weight(msb->used_blocks_bitmap,
163 msb->block_count) == total_free_blocks)
164 return 0;
165
166 pr_err("BUG: free block counts don't match the bitmap");
167 msb->read_only = true;
168 return -EINVAL;
169 }
170
171 /* Mark physical block as used */
172 static void msb_mark_block_used(struct msb_data *msb, int pba)
173 {
174 int zone = msb_get_zone_from_pba(pba);
175
176 if (test_bit(pba, msb->used_blocks_bitmap)) {
177 pr_err(
178 "BUG: attempt to mark already used pba %d as used", pba);
179 msb->read_only = true;
180 return;
181 }
182
183 if (msb_validate_used_block_bitmap(msb))
184 return;
185
186 /* No races because all IO is single threaded */
187 __set_bit(pba, msb->used_blocks_bitmap);
188 msb->free_block_count[zone]--;
189 }
190
191 /* Mark physical block as free */
192 static void msb_mark_block_unused(struct msb_data *msb, int pba)
193 {
194 int zone = msb_get_zone_from_pba(pba);
195
196 if (!test_bit(pba, msb->used_blocks_bitmap)) {
197 pr_err("BUG: attempt to mark already unused pba %d as unused" , pba);
198 msb->read_only = true;
199 return;
200 }
201
202 if (msb_validate_used_block_bitmap(msb))
203 return;
204
205 /* No races because all IO is single threaded */
206 __clear_bit(pba, msb->used_blocks_bitmap);
207 msb->free_block_count[zone]++;
208 }
209
210 /* Invalidate current register window */
211 static void msb_invalidate_reg_window(struct msb_data *msb)
212 {
213 msb->reg_addr.w_offset = offsetof(struct ms_register, id);
214 msb->reg_addr.w_length = sizeof(struct ms_id_register);
215 msb->reg_addr.r_offset = offsetof(struct ms_register, id);
216 msb->reg_addr.r_length = sizeof(struct ms_id_register);
217 msb->addr_valid = false;
218 }
219
220 /* Start a state machine */
221 static int msb_run_state_machine(struct msb_data *msb, int (*state_func)
222 (struct memstick_dev *card, struct memstick_request **req))
223 {
224 struct memstick_dev *card = msb->card;
225
226 WARN_ON(msb->state != -1);
227 msb->int_polling = false;
228 msb->state = 0;
229 msb->exit_error = 0;
230
231 memset(&card->current_mrq, 0, sizeof(card->current_mrq));
232
233 card->next_request = state_func;
234 memstick_new_req(card->host);
235 wait_for_completion(&card->mrq_complete);
236
237 WARN_ON(msb->state != -1);
238 return msb->exit_error;
239 }
240
241 /* State machines call that to exit */
242 static int msb_exit_state_machine(struct msb_data *msb, int error)
243 {
244 WARN_ON(msb->state == -1);
245
246 msb->state = -1;
247 msb->exit_error = error;
248 msb->card->next_request = h_msb_default_bad;
249
250 /* Invalidate reg window on errors */
251 if (error)
252 msb_invalidate_reg_window(msb);
253
254 complete(&msb->card->mrq_complete);
255 return -ENXIO;
256 }
257
258 /* read INT register */
259 static int msb_read_int_reg(struct msb_data *msb, long timeout)
260 {
261 struct memstick_request *mrq = &msb->card->current_mrq;
262
263 WARN_ON(msb->state == -1);
264
265 if (!msb->int_polling) {
266 msb->int_timeout = jiffies +
267 msecs_to_jiffies(timeout == -1 ? 500 : timeout);
268 msb->int_polling = true;
269 } else if (time_after(jiffies, msb->int_timeout)) {
270 mrq->data[0] = MEMSTICK_INT_CMDNAK;
271 return 0;
272 }
273
274 if ((msb->caps & MEMSTICK_CAP_AUTO_GET_INT) &&
275 mrq->need_card_int && !mrq->error) {
276 mrq->data[0] = mrq->int_reg;
277 mrq->need_card_int = false;
278 return 0;
279 } else {
280 memstick_init_req(mrq, MS_TPC_GET_INT, NULL, 1);
281 return 1;
282 }
283 }
284
285 /* Read a register */
286 static int msb_read_regs(struct msb_data *msb, int offset, int len)
287 {
288 struct memstick_request *req = &msb->card->current_mrq;
289
290 if (msb->reg_addr.r_offset != offset ||
291 msb->reg_addr.r_length != len || !msb->addr_valid) {
292
293 msb->reg_addr.r_offset = offset;
294 msb->reg_addr.r_length = len;
295 msb->addr_valid = true;
296
297 memstick_init_req(req, MS_TPC_SET_RW_REG_ADRS,
298 &msb->reg_addr, sizeof(msb->reg_addr));
299 return 0;
300 }
301
302 memstick_init_req(req, MS_TPC_READ_REG, NULL, len);
303 return 1;
304 }
305
306 /* Write a card register */
307 static int msb_write_regs(struct msb_data *msb, int offset, int len, void *buf)
308 {
309 struct memstick_request *req = &msb->card->current_mrq;
310
311 if (msb->reg_addr.w_offset != offset ||
312 msb->reg_addr.w_length != len || !msb->addr_valid) {
313
314 msb->reg_addr.w_offset = offset;
315 msb->reg_addr.w_length = len;
316 msb->addr_valid = true;
317
318 memstick_init_req(req, MS_TPC_SET_RW_REG_ADRS,
319 &msb->reg_addr, sizeof(msb->reg_addr));
320 return 0;
321 }
322
323 memstick_init_req(req, MS_TPC_WRITE_REG, buf, len);
324 return 1;
325 }
326
327 /* Handler for absence of IO */
328 static int h_msb_default_bad(struct memstick_dev *card,
329 struct memstick_request **mrq)
330 {
331 return -ENXIO;
332 }
333
334 /*
335 * This function is a handler for reads of one page from device.
336 * Writes output to msb->current_sg, takes sector address from msb->reg.param
337 * Can also be used to read extra data only. Set params accordintly.
338 */
339 static int h_msb_read_page(struct memstick_dev *card,
340 struct memstick_request **out_mrq)
341 {
342 struct msb_data *msb = memstick_get_drvdata(card);
343 struct memstick_request *mrq = *out_mrq = &card->current_mrq;
344 struct scatterlist sg[2];
345 u8 command, intreg;
346
347 if (mrq->error) {
348 dbg("read_page, unknown error");
349 return msb_exit_state_machine(msb, mrq->error);
350 }
351 again:
352 switch (msb->state) {
353 case MSB_RP_SEND_BLOCK_ADDRESS:
354 /* msb_write_regs sometimes "fails" because it needs to update
355 the reg window, and thus it returns request for that.
356 Then we stay in this state and retry */
357 if (!msb_write_regs(msb,
358 offsetof(struct ms_register, param),
359 sizeof(struct ms_param_register),
360 (unsigned char *)&msb->regs.param))
361 return 0;
362
363 msb->state = MSB_RP_SEND_READ_COMMAND;
364 return 0;
365
366 case MSB_RP_SEND_READ_COMMAND:
367 command = MS_CMD_BLOCK_READ;
368 memstick_init_req(mrq, MS_TPC_SET_CMD, &command, 1);
369 msb->state = MSB_RP_SEND_INT_REQ;
370 return 0;
371
372 case MSB_RP_SEND_INT_REQ:
373 msb->state = MSB_RP_RECEIVE_INT_REQ_RESULT;
374 /* If dont actually need to send the int read request (only in
375 serial mode), then just fall through */
376 if (msb_read_int_reg(msb, -1))
377 return 0;
378 /* fallthrough */
379
380 case MSB_RP_RECEIVE_INT_REQ_RESULT:
381 intreg = mrq->data[0];
382 msb->regs.status.interrupt = intreg;
383
384 if (intreg & MEMSTICK_INT_CMDNAK)
385 return msb_exit_state_machine(msb, -EIO);
386
387 if (!(intreg & MEMSTICK_INT_CED)) {
388 msb->state = MSB_RP_SEND_INT_REQ;
389 goto again;
390 }
391
392 msb->int_polling = false;
393 msb->state = (intreg & MEMSTICK_INT_ERR) ?
394 MSB_RP_SEND_READ_STATUS_REG : MSB_RP_SEND_OOB_READ;
395 goto again;
396
397 case MSB_RP_SEND_READ_STATUS_REG:
398 /* read the status register to understand source of the INT_ERR */
399 if (!msb_read_regs(msb,
400 offsetof(struct ms_register, status),
401 sizeof(struct ms_status_register)))
402 return 0;
403
404 msb->state = MSB_RP_RECEIVE_STATUS_REG;
405 return 0;
406
407 case MSB_RP_RECEIVE_STATUS_REG:
408 msb->regs.status = *(struct ms_status_register *)mrq->data;
409 msb->state = MSB_RP_SEND_OOB_READ;
410 /* fallthrough */
411
412 case MSB_RP_SEND_OOB_READ:
413 if (!msb_read_regs(msb,
414 offsetof(struct ms_register, extra_data),
415 sizeof(struct ms_extra_data_register)))
416 return 0;
417
418 msb->state = MSB_RP_RECEIVE_OOB_READ;
419 return 0;
420
421 case MSB_RP_RECEIVE_OOB_READ:
422 msb->regs.extra_data =
423 *(struct ms_extra_data_register *) mrq->data;
424 msb->state = MSB_RP_SEND_READ_DATA;
425 /* fallthrough */
426
427 case MSB_RP_SEND_READ_DATA:
428 /* Skip that state if we only read the oob */
429 if (msb->regs.param.cp == MEMSTICK_CP_EXTRA) {
430 msb->state = MSB_RP_RECEIVE_READ_DATA;
431 goto again;
432 }
433
434 sg_init_table(sg, ARRAY_SIZE(sg));
435 msb_sg_copy(msb->current_sg, sg, ARRAY_SIZE(sg),
436 msb->current_sg_offset,
437 msb->page_size);
438
439 memstick_init_req_sg(mrq, MS_TPC_READ_LONG_DATA, sg);
440 msb->state = MSB_RP_RECEIVE_READ_DATA;
441 return 0;
442
443 case MSB_RP_RECEIVE_READ_DATA:
444 if (!(msb->regs.status.interrupt & MEMSTICK_INT_ERR)) {
445 msb->current_sg_offset += msb->page_size;
446 return msb_exit_state_machine(msb, 0);
447 }
448
449 if (msb->regs.status.status1 & MEMSTICK_UNCORR_ERROR) {
450 dbg("read_page: uncorrectable error");
451 return msb_exit_state_machine(msb, -EBADMSG);
452 }
453
454 if (msb->regs.status.status1 & MEMSTICK_CORR_ERROR) {
455 dbg("read_page: correctable error");
456 msb->current_sg_offset += msb->page_size;
457 return msb_exit_state_machine(msb, -EUCLEAN);
458 } else {
459 dbg("read_page: INT error, but no status error bits");
460 return msb_exit_state_machine(msb, -EIO);
461 }
462 }
463
464 BUG();
465 }
466
467 /*
468 * Handler of writes of exactly one block.
469 * Takes address from msb->regs.param.
470 * Writes same extra data to blocks, also taken
471 * from msb->regs.extra
472 * Returns -EBADMSG if write fails due to uncorrectable error, or -EIO if
473 * device refuses to take the command or something else
474 */
475 static int h_msb_write_block(struct memstick_dev *card,
476 struct memstick_request **out_mrq)
477 {
478 struct msb_data *msb = memstick_get_drvdata(card);
479 struct memstick_request *mrq = *out_mrq = &card->current_mrq;
480 struct scatterlist sg[2];
481 u8 intreg, command;
482
483 if (mrq->error)
484 return msb_exit_state_machine(msb, mrq->error);
485
486 again:
487 switch (msb->state) {
488
489 /* HACK: Jmicon handling of TPCs between 8 and
490 * sizeof(memstick_request.data) is broken due to hardware
491 * bug in PIO mode that is used for these TPCs
492 * Therefore split the write
493 */
494
495 case MSB_WB_SEND_WRITE_PARAMS:
496 if (!msb_write_regs(msb,
497 offsetof(struct ms_register, param),
498 sizeof(struct ms_param_register),
499 &msb->regs.param))
500 return 0;
501
502 msb->state = MSB_WB_SEND_WRITE_OOB;
503 return 0;
504
505 case MSB_WB_SEND_WRITE_OOB:
506 if (!msb_write_regs(msb,
507 offsetof(struct ms_register, extra_data),
508 sizeof(struct ms_extra_data_register),
509 &msb->regs.extra_data))
510 return 0;
511 msb->state = MSB_WB_SEND_WRITE_COMMAND;
512 return 0;
513
514
515 case MSB_WB_SEND_WRITE_COMMAND:
516 command = MS_CMD_BLOCK_WRITE;
517 memstick_init_req(mrq, MS_TPC_SET_CMD, &command, 1);
518 msb->state = MSB_WB_SEND_INT_REQ;
519 return 0;
520
521 case MSB_WB_SEND_INT_REQ:
522 msb->state = MSB_WB_RECEIVE_INT_REQ;
523 if (msb_read_int_reg(msb, -1))
524 return 0;
525 /* fallthrough */
526
527 case MSB_WB_RECEIVE_INT_REQ:
528 intreg = mrq->data[0];
529 msb->regs.status.interrupt = intreg;
530
531 /* errors mean out of here, and fast... */
532 if (intreg & (MEMSTICK_INT_CMDNAK))
533 return msb_exit_state_machine(msb, -EIO);
534
535 if (intreg & MEMSTICK_INT_ERR)
536 return msb_exit_state_machine(msb, -EBADMSG);
537
538
539 /* for last page we need to poll CED */
540 if (msb->current_page == msb->pages_in_block) {
541 if (intreg & MEMSTICK_INT_CED)
542 return msb_exit_state_machine(msb, 0);
543 msb->state = MSB_WB_SEND_INT_REQ;
544 goto again;
545
546 }
547
548 /* for non-last page we need BREQ before writing next chunk */
549 if (!(intreg & MEMSTICK_INT_BREQ)) {
550 msb->state = MSB_WB_SEND_INT_REQ;
551 goto again;
552 }
553
554 msb->int_polling = false;
555 msb->state = MSB_WB_SEND_WRITE_DATA;
556 /* fallthrough */
557
558 case MSB_WB_SEND_WRITE_DATA:
559 sg_init_table(sg, ARRAY_SIZE(sg));
560
561 if (msb_sg_copy(msb->current_sg, sg, ARRAY_SIZE(sg),
562 msb->current_sg_offset,
563 msb->page_size) < msb->page_size)
564 return msb_exit_state_machine(msb, -EIO);
565
566 memstick_init_req_sg(mrq, MS_TPC_WRITE_LONG_DATA, sg);
567 mrq->need_card_int = 1;
568 msb->state = MSB_WB_RECEIVE_WRITE_CONFIRMATION;
569 return 0;
570
571 case MSB_WB_RECEIVE_WRITE_CONFIRMATION:
572 msb->current_page++;
573 msb->current_sg_offset += msb->page_size;
574 msb->state = MSB_WB_SEND_INT_REQ;
575 goto again;
576 default:
577 BUG();
578 }
579
580 return 0;
581 }
582
583 /*
584 * This function is used to send simple IO requests to device that consist
585 * of register write + command
586 */
587 static int h_msb_send_command(struct memstick_dev *card,
588 struct memstick_request **out_mrq)
589 {
590 struct msb_data *msb = memstick_get_drvdata(card);
591 struct memstick_request *mrq = *out_mrq = &card->current_mrq;
592 u8 intreg;
593
594 if (mrq->error) {
595 dbg("send_command: unknown error");
596 return msb_exit_state_machine(msb, mrq->error);
597 }
598 again:
599 switch (msb->state) {
600
601 /* HACK: see h_msb_write_block */
602 case MSB_SC_SEND_WRITE_PARAMS: /* write param register*/
603 if (!msb_write_regs(msb,
604 offsetof(struct ms_register, param),
605 sizeof(struct ms_param_register),
606 &msb->regs.param))
607 return 0;
608 msb->state = MSB_SC_SEND_WRITE_OOB;
609 return 0;
610
611 case MSB_SC_SEND_WRITE_OOB:
612 if (!msb->command_need_oob) {
613 msb->state = MSB_SC_SEND_COMMAND;
614 goto again;
615 }
616
617 if (!msb_write_regs(msb,
618 offsetof(struct ms_register, extra_data),
619 sizeof(struct ms_extra_data_register),
620 &msb->regs.extra_data))
621 return 0;
622
623 msb->state = MSB_SC_SEND_COMMAND;
624 return 0;
625
626 case MSB_SC_SEND_COMMAND:
627 memstick_init_req(mrq, MS_TPC_SET_CMD, &msb->command_value, 1);
628 msb->state = MSB_SC_SEND_INT_REQ;
629 return 0;
630
631 case MSB_SC_SEND_INT_REQ:
632 msb->state = MSB_SC_RECEIVE_INT_REQ;
633 if (msb_read_int_reg(msb, -1))
634 return 0;
635 /* fallthrough */
636
637 case MSB_SC_RECEIVE_INT_REQ:
638 intreg = mrq->data[0];
639
640 if (intreg & MEMSTICK_INT_CMDNAK)
641 return msb_exit_state_machine(msb, -EIO);
642 if (intreg & MEMSTICK_INT_ERR)
643 return msb_exit_state_machine(msb, -EBADMSG);
644
645 if (!(intreg & MEMSTICK_INT_CED)) {
646 msb->state = MSB_SC_SEND_INT_REQ;
647 goto again;
648 }
649
650 return msb_exit_state_machine(msb, 0);
651 }
652
653 BUG();
654 }
655
656 /* Small handler for card reset */
657 static int h_msb_reset(struct memstick_dev *card,
658 struct memstick_request **out_mrq)
659 {
660 u8 command = MS_CMD_RESET;
661 struct msb_data *msb = memstick_get_drvdata(card);
662 struct memstick_request *mrq = *out_mrq = &card->current_mrq;
663
664 if (mrq->error)
665 return msb_exit_state_machine(msb, mrq->error);
666
667 switch (msb->state) {
668 case MSB_RS_SEND:
669 memstick_init_req(mrq, MS_TPC_SET_CMD, &command, 1);
670 mrq->need_card_int = 0;
671 msb->state = MSB_RS_CONFIRM;
672 return 0;
673 case MSB_RS_CONFIRM:
674 return msb_exit_state_machine(msb, 0);
675 }
676 BUG();
677 }
678
679 /* This handler is used to do serial->parallel switch */
680 static int h_msb_parallel_switch(struct memstick_dev *card,
681 struct memstick_request **out_mrq)
682 {
683 struct msb_data *msb = memstick_get_drvdata(card);
684 struct memstick_request *mrq = *out_mrq = &card->current_mrq;
685 struct memstick_host *host = card->host;
686
687 if (mrq->error) {
688 dbg("parallel_switch: error");
689 msb->regs.param.system &= ~MEMSTICK_SYS_PAM;
690 return msb_exit_state_machine(msb, mrq->error);
691 }
692
693 switch (msb->state) {
694 case MSB_PS_SEND_SWITCH_COMMAND:
695 /* Set the parallel interface on memstick side */
696 msb->regs.param.system |= MEMSTICK_SYS_PAM;
697
698 if (!msb_write_regs(msb,
699 offsetof(struct ms_register, param),
700 1,
701 (unsigned char *)&msb->regs.param))
702 return 0;
703
704 msb->state = MSB_PS_SWICH_HOST;
705 return 0;
706
707 case MSB_PS_SWICH_HOST:
708 /* Set parallel interface on our side + send a dummy request
709 to see if card responds */
710 host->set_param(host, MEMSTICK_INTERFACE, MEMSTICK_PAR4);
711 memstick_init_req(mrq, MS_TPC_GET_INT, NULL, 1);
712 msb->state = MSB_PS_CONFIRM;
713 return 0;
714
715 case MSB_PS_CONFIRM:
716 return msb_exit_state_machine(msb, 0);
717 }
718
719 BUG();
720 }
721
722 static int msb_switch_to_parallel(struct msb_data *msb);
723
724 /* Reset the card, to guard against hw errors beeing treated as bad blocks */
725 static int msb_reset(struct msb_data *msb, bool full)
726 {
727
728 bool was_parallel = msb->regs.param.system & MEMSTICK_SYS_PAM;
729 struct memstick_dev *card = msb->card;
730 struct memstick_host *host = card->host;
731 int error;
732
733 /* Reset the card */
734 msb->regs.param.system = MEMSTICK_SYS_BAMD;
735
736 if (full) {
737 error = host->set_param(host,
738 MEMSTICK_POWER, MEMSTICK_POWER_OFF);
739 if (error)
740 goto out_error;
741
742 msb_invalidate_reg_window(msb);
743
744 error = host->set_param(host,
745 MEMSTICK_POWER, MEMSTICK_POWER_ON);
746 if (error)
747 goto out_error;
748
749 error = host->set_param(host,
750 MEMSTICK_INTERFACE, MEMSTICK_SERIAL);
751 if (error) {
752 out_error:
753 dbg("Failed to reset the host controller");
754 msb->read_only = true;
755 return -EFAULT;
756 }
757 }
758
759 error = msb_run_state_machine(msb, h_msb_reset);
760 if (error) {
761 dbg("Failed to reset the card");
762 msb->read_only = true;
763 return -ENODEV;
764 }
765
766 /* Set parallel mode */
767 if (was_parallel)
768 msb_switch_to_parallel(msb);
769 return 0;
770 }
771
772 /* Attempts to switch interface to parallel mode */
773 static int msb_switch_to_parallel(struct msb_data *msb)
774 {
775 int error;
776
777 error = msb_run_state_machine(msb, h_msb_parallel_switch);
778 if (error) {
779 pr_err("Switch to parallel failed");
780 msb->regs.param.system &= ~MEMSTICK_SYS_PAM;
781 msb_reset(msb, true);
782 return -EFAULT;
783 }
784
785 msb->caps |= MEMSTICK_CAP_AUTO_GET_INT;
786 return 0;
787 }
788
789 /* Changes overwrite flag on a page */
790 static int msb_set_overwrite_flag(struct msb_data *msb,
791 u16 pba, u8 page, u8 flag)
792 {
793 if (msb->read_only)
794 return -EROFS;
795
796 msb->regs.param.block_address = cpu_to_be16(pba);
797 msb->regs.param.page_address = page;
798 msb->regs.param.cp = MEMSTICK_CP_OVERWRITE;
799 msb->regs.extra_data.overwrite_flag = flag;
800 msb->command_value = MS_CMD_BLOCK_WRITE;
801 msb->command_need_oob = true;
802
803 dbg_verbose("changing overwrite flag to %02x for sector %d, page %d",
804 flag, pba, page);
805 return msb_run_state_machine(msb, h_msb_send_command);
806 }
807
808 static int msb_mark_bad(struct msb_data *msb, int pba)
809 {
810 pr_notice("marking pba %d as bad", pba);
811 msb_reset(msb, true);
812 return msb_set_overwrite_flag(
813 msb, pba, 0, 0xFF & ~MEMSTICK_OVERWRITE_BKST);
814 }
815
816 static int msb_mark_page_bad(struct msb_data *msb, int pba, int page)
817 {
818 dbg("marking page %d of pba %d as bad", page, pba);
819 msb_reset(msb, true);
820 return msb_set_overwrite_flag(msb,
821 pba, page, ~MEMSTICK_OVERWRITE_PGST0);
822 }
823
824 /* Erases one physical block */
825 static int msb_erase_block(struct msb_data *msb, u16 pba)
826 {
827 int error, try;
828 if (msb->read_only)
829 return -EROFS;
830
831 dbg_verbose("erasing pba %d", pba);
832
833 for (try = 1; try < 3; try++) {
834 msb->regs.param.block_address = cpu_to_be16(pba);
835 msb->regs.param.page_address = 0;
836 msb->regs.param.cp = MEMSTICK_CP_BLOCK;
837 msb->command_value = MS_CMD_BLOCK_ERASE;
838 msb->command_need_oob = false;
839
840
841 error = msb_run_state_machine(msb, h_msb_send_command);
842 if (!error || msb_reset(msb, true))
843 break;
844 }
845
846 if (error) {
847 pr_err("erase failed, marking pba %d as bad", pba);
848 msb_mark_bad(msb, pba);
849 }
850
851 dbg_verbose("erase success, marking pba %d as unused", pba);
852 msb_mark_block_unused(msb, pba);
853 __set_bit(pba, msb->erased_blocks_bitmap);
854 return error;
855 }
856
857 /* Reads one page from device */
858 static int msb_read_page(struct msb_data *msb,
859 u16 pba, u8 page, struct ms_extra_data_register *extra,
860 struct scatterlist *sg, int offset)
861 {
862 int try, error;
863
864 if (pba == MS_BLOCK_INVALID) {
865 unsigned long flags;
866 struct sg_mapping_iter miter;
867 size_t len = msb->page_size;
868
869 dbg_verbose("read unmapped sector. returning 0xFF");
870
871 local_irq_save(flags);
872 sg_miter_start(&miter, sg, sg_nents(sg),
873 SG_MITER_ATOMIC | SG_MITER_TO_SG);
874
875 while (sg_miter_next(&miter) && len > 0) {
876
877 int chunklen;
878
879 if (offset && offset >= miter.length) {
880 offset -= miter.length;
881 continue;
882 }
883
884 chunklen = min(miter.length - offset, len);
885 memset(miter.addr + offset, 0xFF, chunklen);
886 len -= chunklen;
887 offset = 0;
888 }
889
890 sg_miter_stop(&miter);
891 local_irq_restore(flags);
892
893 if (offset)
894 return -EFAULT;
895
896 if (extra)
897 memset(extra, 0xFF, sizeof(*extra));
898 return 0;
899 }
900
901 if (pba >= msb->block_count) {
902 pr_err("BUG: attempt to read beyond the end of the card at pba %d", pba);
903 return -EINVAL;
904 }
905
906 for (try = 1; try < 3; try++) {
907 msb->regs.param.block_address = cpu_to_be16(pba);
908 msb->regs.param.page_address = page;
909 msb->regs.param.cp = MEMSTICK_CP_PAGE;
910
911 msb->current_sg = sg;
912 msb->current_sg_offset = offset;
913 error = msb_run_state_machine(msb, h_msb_read_page);
914
915
916 if (error == -EUCLEAN) {
917 pr_notice("correctable error on pba %d, page %d",
918 pba, page);
919 error = 0;
920 }
921
922 if (!error && extra)
923 *extra = msb->regs.extra_data;
924
925 if (!error || msb_reset(msb, true))
926 break;
927
928 }
929
930 /* Mark bad pages */
931 if (error == -EBADMSG) {
932 pr_err("uncorrectable error on read of pba %d, page %d",
933 pba, page);
934
935 if (msb->regs.extra_data.overwrite_flag &
936 MEMSTICK_OVERWRITE_PGST0)
937 msb_mark_page_bad(msb, pba, page);
938 return -EBADMSG;
939 }
940
941 if (error)
942 pr_err("read of pba %d, page %d failed with error %d",
943 pba, page, error);
944 return error;
945 }
946
947 /* Reads oob of page only */
948 static int msb_read_oob(struct msb_data *msb, u16 pba, u16 page,
949 struct ms_extra_data_register *extra)
950 {
951 int error;
952
953 BUG_ON(!extra);
954 msb->regs.param.block_address = cpu_to_be16(pba);
955 msb->regs.param.page_address = page;
956 msb->regs.param.cp = MEMSTICK_CP_EXTRA;
957
958 if (pba > msb->block_count) {
959 pr_err("BUG: attempt to read beyond the end of card at pba %d", pba);
960 return -EINVAL;
961 }
962
963 error = msb_run_state_machine(msb, h_msb_read_page);
964 *extra = msb->regs.extra_data;
965
966 if (error == -EUCLEAN) {
967 pr_notice("correctable error on pba %d, page %d",
968 pba, page);
969 return 0;
970 }
971
972 return error;
973 }
974
975 /* Reads a block and compares it with data contained in scatterlist orig_sg */
976 static int msb_verify_block(struct msb_data *msb, u16 pba,
977 struct scatterlist *orig_sg, int offset)
978 {
979 struct scatterlist sg;
980 int page = 0, error;
981
982 sg_init_one(&sg, msb->block_buffer, msb->block_size);
983
984 while (page < msb->pages_in_block) {
985
986 error = msb_read_page(msb, pba, page,
987 NULL, &sg, page * msb->page_size);
988 if (error)
989 return error;
990 page++;
991 }
992
993 if (msb_sg_compare_to_buffer(orig_sg, offset,
994 msb->block_buffer, msb->block_size))
995 return -EIO;
996 return 0;
997 }
998
999 /* Writes exectly one block + oob */
1000 static int msb_write_block(struct msb_data *msb,
1001 u16 pba, u32 lba, struct scatterlist *sg, int offset)
1002 {
1003 int error, current_try = 1;
1004 BUG_ON(sg->length < msb->page_size);
1005
1006 if (msb->read_only)
1007 return -EROFS;
1008
1009 if (pba == MS_BLOCK_INVALID) {
1010 pr_err(
1011 "BUG: write: attempt to write MS_BLOCK_INVALID block");
1012 return -EINVAL;
1013 }
1014
1015 if (pba >= msb->block_count || lba >= msb->logical_block_count) {
1016 pr_err(
1017 "BUG: write: attempt to write beyond the end of device");
1018 return -EINVAL;
1019 }
1020
1021 if (msb_get_zone_from_lba(lba) != msb_get_zone_from_pba(pba)) {
1022 pr_err("BUG: write: lba zone mismatch");
1023 return -EINVAL;
1024 }
1025
1026 if (pba == msb->boot_block_locations[0] ||
1027 pba == msb->boot_block_locations[1]) {
1028 pr_err("BUG: write: attempt to write to boot blocks!");
1029 return -EINVAL;
1030 }
1031
1032 while (1) {
1033
1034 if (msb->read_only)
1035 return -EROFS;
1036
1037 msb->regs.param.cp = MEMSTICK_CP_BLOCK;
1038 msb->regs.param.page_address = 0;
1039 msb->regs.param.block_address = cpu_to_be16(pba);
1040
1041 msb->regs.extra_data.management_flag = 0xFF;
1042 msb->regs.extra_data.overwrite_flag = 0xF8;
1043 msb->regs.extra_data.logical_address = cpu_to_be16(lba);
1044
1045 msb->current_sg = sg;
1046 msb->current_sg_offset = offset;
1047 msb->current_page = 0;
1048
1049 error = msb_run_state_machine(msb, h_msb_write_block);
1050
1051 /* Sector we just wrote to is assumed erased since its pba
1052 was erased. If it wasn't erased, write will succeed
1053 and will just clear the bits that were set in the block
1054 thus test that what we have written,
1055 matches what we expect.
1056 We do trust the blocks that we erased */
1057 if (!error && (verify_writes ||
1058 !test_bit(pba, msb->erased_blocks_bitmap)))
1059 error = msb_verify_block(msb, pba, sg, offset);
1060
1061 if (!error)
1062 break;
1063
1064 if (current_try > 1 || msb_reset(msb, true))
1065 break;
1066
1067 pr_err("write failed, trying to erase the pba %d", pba);
1068 error = msb_erase_block(msb, pba);
1069 if (error)
1070 break;
1071
1072 current_try++;
1073 }
1074 return error;
1075 }
1076
1077 /* Finds a free block for write replacement */
1078 static u16 msb_get_free_block(struct msb_data *msb, int zone)
1079 {
1080 u16 pos;
1081 int pba = zone * MS_BLOCKS_IN_ZONE;
1082 int i;
1083
1084 get_random_bytes(&pos, sizeof(pos));
1085
1086 if (!msb->free_block_count[zone]) {
1087 pr_err("NO free blocks in the zone %d, to use for a write, (media is WORN out) switching to RO mode", zone);
1088 msb->read_only = true;
1089 return MS_BLOCK_INVALID;
1090 }
1091
1092 pos %= msb->free_block_count[zone];
1093
1094 dbg_verbose("have %d choices for a free block, selected randomally: %d",
1095 msb->free_block_count[zone], pos);
1096
1097 pba = find_next_zero_bit(msb->used_blocks_bitmap,
1098 msb->block_count, pba);
1099 for (i = 0; i < pos; ++i)
1100 pba = find_next_zero_bit(msb->used_blocks_bitmap,
1101 msb->block_count, pba + 1);
1102
1103 dbg_verbose("result of the free blocks scan: pba %d", pba);
1104
1105 if (pba == msb->block_count || (msb_get_zone_from_pba(pba)) != zone) {
1106 pr_err("BUG: cant get a free block");
1107 msb->read_only = true;
1108 return MS_BLOCK_INVALID;
1109 }
1110
1111 msb_mark_block_used(msb, pba);
1112 return pba;
1113 }
1114
1115 static int msb_update_block(struct msb_data *msb, u16 lba,
1116 struct scatterlist *sg, int offset)
1117 {
1118 u16 pba, new_pba;
1119 int error, try;
1120
1121 pba = msb->lba_to_pba_table[lba];
1122 dbg_verbose("start of a block update at lba %d, pba %d", lba, pba);
1123
1124 if (pba != MS_BLOCK_INVALID) {
1125 dbg_verbose("setting the update flag on the block");
1126 msb_set_overwrite_flag(msb, pba, 0,
1127 0xFF & ~MEMSTICK_OVERWRITE_UDST);
1128 }
1129
1130 for (try = 0; try < 3; try++) {
1131 new_pba = msb_get_free_block(msb,
1132 msb_get_zone_from_lba(lba));
1133
1134 if (new_pba == MS_BLOCK_INVALID) {
1135 error = -EIO;
1136 goto out;
1137 }
1138
1139 dbg_verbose("block update: writing updated block to the pba %d",
1140 new_pba);
1141 error = msb_write_block(msb, new_pba, lba, sg, offset);
1142 if (error == -EBADMSG) {
1143 msb_mark_bad(msb, new_pba);
1144 continue;
1145 }
1146
1147 if (error)
1148 goto out;
1149
1150 dbg_verbose("block update: erasing the old block");
1151 msb_erase_block(msb, pba);
1152 msb->lba_to_pba_table[lba] = new_pba;
1153 return 0;
1154 }
1155 out:
1156 if (error) {
1157 pr_err("block update error after %d tries, switching to r/o mode", try);
1158 msb->read_only = true;
1159 }
1160 return error;
1161 }
1162
1163 /* Converts endiannes in the boot block for easy use */
1164 static void msb_fix_boot_page_endianness(struct ms_boot_page *p)
1165 {
1166 p->header.block_id = be16_to_cpu(p->header.block_id);
1167 p->header.format_reserved = be16_to_cpu(p->header.format_reserved);
1168 p->entry.disabled_block.start_addr
1169 = be32_to_cpu(p->entry.disabled_block.start_addr);
1170 p->entry.disabled_block.data_size
1171 = be32_to_cpu(p->entry.disabled_block.data_size);
1172 p->entry.cis_idi.start_addr
1173 = be32_to_cpu(p->entry.cis_idi.start_addr);
1174 p->entry.cis_idi.data_size
1175 = be32_to_cpu(p->entry.cis_idi.data_size);
1176 p->attr.block_size = be16_to_cpu(p->attr.block_size);
1177 p->attr.number_of_blocks = be16_to_cpu(p->attr.number_of_blocks);
1178 p->attr.number_of_effective_blocks
1179 = be16_to_cpu(p->attr.number_of_effective_blocks);
1180 p->attr.page_size = be16_to_cpu(p->attr.page_size);
1181 p->attr.memory_manufacturer_code
1182 = be16_to_cpu(p->attr.memory_manufacturer_code);
1183 p->attr.memory_device_code = be16_to_cpu(p->attr.memory_device_code);
1184 p->attr.implemented_capacity
1185 = be16_to_cpu(p->attr.implemented_capacity);
1186 p->attr.controller_number = be16_to_cpu(p->attr.controller_number);
1187 p->attr.controller_function = be16_to_cpu(p->attr.controller_function);
1188 }
1189
1190 static int msb_read_boot_blocks(struct msb_data *msb)
1191 {
1192 int pba = 0;
1193 struct scatterlist sg;
1194 struct ms_extra_data_register extra;
1195 struct ms_boot_page *page;
1196
1197 msb->boot_block_locations[0] = MS_BLOCK_INVALID;
1198 msb->boot_block_locations[1] = MS_BLOCK_INVALID;
1199 msb->boot_block_count = 0;
1200
1201 dbg_verbose("Start of a scan for the boot blocks");
1202
1203 if (!msb->boot_page) {
1204 page = kmalloc(sizeof(struct ms_boot_page)*2, GFP_KERNEL);
1205 if (!page)
1206 return -ENOMEM;
1207
1208 msb->boot_page = page;
1209 } else
1210 page = msb->boot_page;
1211
1212 msb->block_count = MS_BLOCK_MAX_BOOT_ADDR;
1213
1214 for (pba = 0; pba < MS_BLOCK_MAX_BOOT_ADDR; pba++) {
1215
1216 sg_init_one(&sg, page, sizeof(*page));
1217 if (msb_read_page(msb, pba, 0, &extra, &sg, 0)) {
1218 dbg("boot scan: can't read pba %d", pba);
1219 continue;
1220 }
1221
1222 if (extra.management_flag & MEMSTICK_MANAGEMENT_SYSFLG) {
1223 dbg("management flag doesn't indicate boot block %d",
1224 pba);
1225 continue;
1226 }
1227
1228 if (be16_to_cpu(page->header.block_id) != MS_BLOCK_BOOT_ID) {
1229 dbg("the pba at %d doesn' contain boot block ID", pba);
1230 continue;
1231 }
1232
1233 msb_fix_boot_page_endianness(page);
1234 msb->boot_block_locations[msb->boot_block_count] = pba;
1235
1236 page++;
1237 msb->boot_block_count++;
1238
1239 if (msb->boot_block_count == 2)
1240 break;
1241 }
1242
1243 if (!msb->boot_block_count) {
1244 pr_err("media doesn't contain master page, aborting");
1245 return -EIO;
1246 }
1247
1248 dbg_verbose("End of scan for boot blocks");
1249 return 0;
1250 }
1251
1252 static int msb_read_bad_block_table(struct msb_data *msb, int block_nr)
1253 {
1254 struct ms_boot_page *boot_block;
1255 struct scatterlist sg;
1256 u16 *buffer = NULL;
1257 int offset = 0;
1258 int i, error = 0;
1259 int data_size, data_offset, page, page_offset, size_to_read;
1260 u16 pba;
1261
1262 BUG_ON(block_nr > 1);
1263 boot_block = &msb->boot_page[block_nr];
1264 pba = msb->boot_block_locations[block_nr];
1265
1266 if (msb->boot_block_locations[block_nr] == MS_BLOCK_INVALID)
1267 return -EINVAL;
1268
1269 data_size = boot_block->entry.disabled_block.data_size;
1270 data_offset = sizeof(struct ms_boot_page) +
1271 boot_block->entry.disabled_block.start_addr;
1272 if (!data_size)
1273 return 0;
1274
1275 page = data_offset / msb->page_size;
1276 page_offset = data_offset % msb->page_size;
1277 size_to_read =
1278 DIV_ROUND_UP(data_size + page_offset, msb->page_size) *
1279 msb->page_size;
1280
1281 dbg("reading bad block of boot block at pba %d, offset %d len %d",
1282 pba, data_offset, data_size);
1283
1284 buffer = kzalloc(size_to_read, GFP_KERNEL);
1285 if (!buffer)
1286 return -ENOMEM;
1287
1288 /* Read the buffer */
1289 sg_init_one(&sg, buffer, size_to_read);
1290
1291 while (offset < size_to_read) {
1292 error = msb_read_page(msb, pba, page, NULL, &sg, offset);
1293 if (error)
1294 goto out;
1295
1296 page++;
1297 offset += msb->page_size;
1298
1299 if (page == msb->pages_in_block) {
1300 pr_err(
1301 "bad block table extends beyond the boot block");
1302 break;
1303 }
1304 }
1305
1306 /* Process the bad block table */
1307 for (i = page_offset; i < data_size / sizeof(u16); i++) {
1308
1309 u16 bad_block = be16_to_cpu(buffer[i]);
1310
1311 if (bad_block >= msb->block_count) {
1312 dbg("bad block table contains invalid block %d",
1313 bad_block);
1314 continue;
1315 }
1316
1317 if (test_bit(bad_block, msb->used_blocks_bitmap)) {
1318 dbg("duplicate bad block %d in the table",
1319 bad_block);
1320 continue;
1321 }
1322
1323 dbg("block %d is marked as factory bad", bad_block);
1324 msb_mark_block_used(msb, bad_block);
1325 }
1326 out:
1327 kfree(buffer);
1328 return error;
1329 }
1330
1331 static int msb_ftl_initialize(struct msb_data *msb)
1332 {
1333 int i;
1334
1335 if (msb->ftl_initialized)
1336 return 0;
1337
1338 msb->zone_count = msb->block_count / MS_BLOCKS_IN_ZONE;
1339 msb->logical_block_count = msb->zone_count * 496 - 2;
1340
1341 msb->used_blocks_bitmap = kzalloc(msb->block_count / 8, GFP_KERNEL);
1342 msb->erased_blocks_bitmap = kzalloc(msb->block_count / 8, GFP_KERNEL);
1343 msb->lba_to_pba_table =
1344 kmalloc(msb->logical_block_count * sizeof(u16), GFP_KERNEL);
1345
1346 if (!msb->used_blocks_bitmap || !msb->lba_to_pba_table ||
1347 !msb->erased_blocks_bitmap) {
1348 kfree(msb->used_blocks_bitmap);
1349 kfree(msb->lba_to_pba_table);
1350 kfree(msb->erased_blocks_bitmap);
1351 return -ENOMEM;
1352 }
1353
1354 for (i = 0; i < msb->zone_count; i++)
1355 msb->free_block_count[i] = MS_BLOCKS_IN_ZONE;
1356
1357 memset(msb->lba_to_pba_table, MS_BLOCK_INVALID,
1358 msb->logical_block_count * sizeof(u16));
1359
1360 dbg("initial FTL tables created. Zone count = %d, Logical block count = %d",
1361 msb->zone_count, msb->logical_block_count);
1362
1363 msb->ftl_initialized = true;
1364 return 0;
1365 }
1366
1367 static int msb_ftl_scan(struct msb_data *msb)
1368 {
1369 u16 pba, lba, other_block;
1370 u8 overwrite_flag, management_flag, other_overwrite_flag;
1371 int error;
1372 struct ms_extra_data_register extra;
1373 u8 *overwrite_flags = kzalloc(msb->block_count, GFP_KERNEL);
1374
1375 if (!overwrite_flags)
1376 return -ENOMEM;
1377
1378 dbg("Start of media scanning");
1379 for (pba = 0; pba < msb->block_count; pba++) {
1380
1381 if (pba == msb->boot_block_locations[0] ||
1382 pba == msb->boot_block_locations[1]) {
1383 dbg_verbose("pba %05d -> [boot block]", pba);
1384 msb_mark_block_used(msb, pba);
1385 continue;
1386 }
1387
1388 if (test_bit(pba, msb->used_blocks_bitmap)) {
1389 dbg_verbose("pba %05d -> [factory bad]", pba);
1390 continue;
1391 }
1392
1393 memset(&extra, 0, sizeof(extra));
1394 error = msb_read_oob(msb, pba, 0, &extra);
1395
1396 /* can't trust the page if we can't read the oob */
1397 if (error == -EBADMSG) {
1398 pr_notice(
1399 "oob of pba %d damaged, will try to erase it", pba);
1400 msb_mark_block_used(msb, pba);
1401 msb_erase_block(msb, pba);
1402 continue;
1403 } else if (error) {
1404 pr_err("unknown error %d on read of oob of pba %d - aborting",
1405 error, pba);
1406
1407 kfree(overwrite_flags);
1408 return error;
1409 }
1410
1411 lba = be16_to_cpu(extra.logical_address);
1412 management_flag = extra.management_flag;
1413 overwrite_flag = extra.overwrite_flag;
1414 overwrite_flags[pba] = overwrite_flag;
1415
1416 /* Skip bad blocks */
1417 if (!(overwrite_flag & MEMSTICK_OVERWRITE_BKST)) {
1418 dbg("pba %05d -> [BAD]", pba);
1419 msb_mark_block_used(msb, pba);
1420 continue;
1421 }
1422
1423 /* Skip system/drm blocks */
1424 if ((management_flag & MEMSTICK_MANAGEMENT_FLAG_NORMAL) !=
1425 MEMSTICK_MANAGEMENT_FLAG_NORMAL) {
1426 dbg("pba %05d -> [reserved management flag %02x]",
1427 pba, management_flag);
1428 msb_mark_block_used(msb, pba);
1429 continue;
1430 }
1431
1432 /* Erase temporary tables */
1433 if (!(management_flag & MEMSTICK_MANAGEMENT_ATFLG)) {
1434 dbg("pba %05d -> [temp table] - will erase", pba);
1435
1436 msb_mark_block_used(msb, pba);
1437 msb_erase_block(msb, pba);
1438 continue;
1439 }
1440
1441 if (lba == MS_BLOCK_INVALID) {
1442 dbg_verbose("pba %05d -> [free]", pba);
1443 continue;
1444 }
1445
1446 msb_mark_block_used(msb, pba);
1447
1448 /* Block has LBA not according to zoning*/
1449 if (msb_get_zone_from_lba(lba) != msb_get_zone_from_pba(pba)) {
1450 pr_notice("pba %05d -> [bad lba %05d] - will erase",
1451 pba, lba);
1452 msb_erase_block(msb, pba);
1453 continue;
1454 }
1455
1456 /* No collisions - great */
1457 if (msb->lba_to_pba_table[lba] == MS_BLOCK_INVALID) {
1458 dbg_verbose("pba %05d -> [lba %05d]", pba, lba);
1459 msb->lba_to_pba_table[lba] = pba;
1460 continue;
1461 }
1462
1463 other_block = msb->lba_to_pba_table[lba];
1464 other_overwrite_flag = overwrite_flags[other_block];
1465
1466 pr_notice("Collision between pba %d and pba %d",
1467 pba, other_block);
1468
1469 if (!(overwrite_flag & MEMSTICK_OVERWRITE_UDST)) {
1470 pr_notice("pba %d is marked as stable, use it", pba);
1471 msb_erase_block(msb, other_block);
1472 msb->lba_to_pba_table[lba] = pba;
1473 continue;
1474 }
1475
1476 if (!(other_overwrite_flag & MEMSTICK_OVERWRITE_UDST)) {
1477 pr_notice("pba %d is marked as stable, use it",
1478 other_block);
1479 msb_erase_block(msb, pba);
1480 continue;
1481 }
1482
1483 pr_notice("collision between blocks %d and %d, without stable flag set on both, erasing pba %d",
1484 pba, other_block, other_block);
1485
1486 msb_erase_block(msb, other_block);
1487 msb->lba_to_pba_table[lba] = pba;
1488 }
1489
1490 dbg("End of media scanning");
1491 kfree(overwrite_flags);
1492 return 0;
1493 }
1494
1495 static void msb_cache_flush_timer(unsigned long data)
1496 {
1497 struct msb_data *msb = (struct msb_data *)data;
1498 msb->need_flush_cache = true;
1499 queue_work(msb->io_queue, &msb->io_work);
1500 }
1501
1502
1503 static void msb_cache_discard(struct msb_data *msb)
1504 {
1505 if (msb->cache_block_lba == MS_BLOCK_INVALID)
1506 return;
1507
1508 del_timer_sync(&msb->cache_flush_timer);
1509
1510 dbg_verbose("Discarding the write cache");
1511 msb->cache_block_lba = MS_BLOCK_INVALID;
1512 bitmap_zero(&msb->valid_cache_bitmap, msb->pages_in_block);
1513 }
1514
1515 static int msb_cache_init(struct msb_data *msb)
1516 {
1517 setup_timer(&msb->cache_flush_timer, msb_cache_flush_timer,
1518 (unsigned long)msb);
1519
1520 if (!msb->cache)
1521 msb->cache = kzalloc(msb->block_size, GFP_KERNEL);
1522 if (!msb->cache)
1523 return -ENOMEM;
1524
1525 msb_cache_discard(msb);
1526 return 0;
1527 }
1528
1529 static int msb_cache_flush(struct msb_data *msb)
1530 {
1531 struct scatterlist sg;
1532 struct ms_extra_data_register extra;
1533 int page, offset, error;
1534 u16 pba, lba;
1535
1536 if (msb->read_only)
1537 return -EROFS;
1538
1539 if (msb->cache_block_lba == MS_BLOCK_INVALID)
1540 return 0;
1541
1542 lba = msb->cache_block_lba;
1543 pba = msb->lba_to_pba_table[lba];
1544
1545 dbg_verbose("Flushing the write cache of pba %d (LBA %d)",
1546 pba, msb->cache_block_lba);
1547
1548 sg_init_one(&sg, msb->cache , msb->block_size);
1549
1550 /* Read all missing pages in cache */
1551 for (page = 0; page < msb->pages_in_block; page++) {
1552
1553 if (test_bit(page, &msb->valid_cache_bitmap))
1554 continue;
1555
1556 offset = page * msb->page_size;
1557
1558 dbg_verbose("reading non-present sector %d of cache block %d",
1559 page, lba);
1560 error = msb_read_page(msb, pba, page, &extra, &sg, offset);
1561
1562 /* Bad pages are copied with 00 page status */
1563 if (error == -EBADMSG) {
1564 pr_err("read error on sector %d, contents probably damaged", page);
1565 continue;
1566 }
1567
1568 if (error)
1569 return error;
1570
1571 if ((extra.overwrite_flag & MEMSTICK_OV_PG_NORMAL) !=
1572 MEMSTICK_OV_PG_NORMAL) {
1573 dbg("page %d is marked as bad", page);
1574 continue;
1575 }
1576
1577 set_bit(page, &msb->valid_cache_bitmap);
1578 }
1579
1580 /* Write the cache now */
1581 error = msb_update_block(msb, msb->cache_block_lba, &sg, 0);
1582 pba = msb->lba_to_pba_table[msb->cache_block_lba];
1583
1584 /* Mark invalid pages */
1585 if (!error) {
1586 for (page = 0; page < msb->pages_in_block; page++) {
1587
1588 if (test_bit(page, &msb->valid_cache_bitmap))
1589 continue;
1590
1591 dbg("marking page %d as containing damaged data",
1592 page);
1593 msb_set_overwrite_flag(msb,
1594 pba , page, 0xFF & ~MEMSTICK_OV_PG_NORMAL);
1595 }
1596 }
1597
1598 msb_cache_discard(msb);
1599 return error;
1600 }
1601
1602 static int msb_cache_write(struct msb_data *msb, int lba,
1603 int page, bool add_to_cache_only, struct scatterlist *sg, int offset)
1604 {
1605 int error;
1606 struct scatterlist sg_tmp[10];
1607
1608 if (msb->read_only)
1609 return -EROFS;
1610
1611 if (msb->cache_block_lba == MS_BLOCK_INVALID ||
1612 lba != msb->cache_block_lba)
1613 if (add_to_cache_only)
1614 return 0;
1615
1616 /* If we need to write different block */
1617 if (msb->cache_block_lba != MS_BLOCK_INVALID &&
1618 lba != msb->cache_block_lba) {
1619 dbg_verbose("first flush the cache");
1620 error = msb_cache_flush(msb);
1621 if (error)
1622 return error;
1623 }
1624
1625 if (msb->cache_block_lba == MS_BLOCK_INVALID) {
1626 msb->cache_block_lba = lba;
1627 mod_timer(&msb->cache_flush_timer,
1628 jiffies + msecs_to_jiffies(cache_flush_timeout));
1629 }
1630
1631 dbg_verbose("Write of LBA %d page %d to cache ", lba, page);
1632
1633 sg_init_table(sg_tmp, ARRAY_SIZE(sg_tmp));
1634 msb_sg_copy(sg, sg_tmp, ARRAY_SIZE(sg_tmp), offset, msb->page_size);
1635
1636 sg_copy_to_buffer(sg_tmp, sg_nents(sg_tmp),
1637 msb->cache + page * msb->page_size, msb->page_size);
1638
1639 set_bit(page, &msb->valid_cache_bitmap);
1640 return 0;
1641 }
1642
1643 static int msb_cache_read(struct msb_data *msb, int lba,
1644 int page, struct scatterlist *sg, int offset)
1645 {
1646 int pba = msb->lba_to_pba_table[lba];
1647 struct scatterlist sg_tmp[10];
1648 int error = 0;
1649
1650 if (lba == msb->cache_block_lba &&
1651 test_bit(page, &msb->valid_cache_bitmap)) {
1652
1653 dbg_verbose("Read of LBA %d (pba %d) sector %d from cache",
1654 lba, pba, page);
1655
1656 sg_init_table(sg_tmp, ARRAY_SIZE(sg_tmp));
1657 msb_sg_copy(sg, sg_tmp, ARRAY_SIZE(sg_tmp),
1658 offset, msb->page_size);
1659 sg_copy_from_buffer(sg_tmp, sg_nents(sg_tmp),
1660 msb->cache + msb->page_size * page,
1661 msb->page_size);
1662 } else {
1663 dbg_verbose("Read of LBA %d (pba %d) sector %d from device",
1664 lba, pba, page);
1665
1666 error = msb_read_page(msb, pba, page, NULL, sg, offset);
1667 if (error)
1668 return error;
1669
1670 msb_cache_write(msb, lba, page, true, sg, offset);
1671 }
1672 return error;
1673 }
1674
1675 /* Emulated geometry table
1676 * This table content isn't that importaint,
1677 * One could put here different values, providing that they still
1678 * cover whole disk.
1679 * 64 MB entry is what windows reports for my 64M memstick */
1680
1681 static const struct chs_entry chs_table[] = {
1682 /* size sectors cylynders heads */
1683 { 4, 16, 247, 2 },
1684 { 8, 16, 495, 2 },
1685 { 16, 16, 495, 4 },
1686 { 32, 16, 991, 4 },
1687 { 64, 16, 991, 8 },
1688 {128, 16, 991, 16 },
1689 { 0 }
1690 };
1691
1692 /* Load information about the card */
1693 static int msb_init_card(struct memstick_dev *card)
1694 {
1695 struct msb_data *msb = memstick_get_drvdata(card);
1696 struct memstick_host *host = card->host;
1697 struct ms_boot_page *boot_block;
1698 int error = 0, i, raw_size_in_megs;
1699
1700 msb->caps = 0;
1701
1702 if (card->id.class >= MEMSTICK_CLASS_ROM &&
1703 card->id.class <= MEMSTICK_CLASS_ROM)
1704 msb->read_only = true;
1705
1706 msb->state = -1;
1707 error = msb_reset(msb, false);
1708 if (error)
1709 return error;
1710
1711 /* Due to a bug in Jmicron driver written by Alex Dubov,
1712 its serial mode barely works,
1713 so we switch to parallel mode right away */
1714 if (host->caps & MEMSTICK_CAP_PAR4)
1715 msb_switch_to_parallel(msb);
1716
1717 msb->page_size = sizeof(struct ms_boot_page);
1718
1719 /* Read the boot page */
1720 error = msb_read_boot_blocks(msb);
1721 if (error)
1722 return -EIO;
1723
1724 boot_block = &msb->boot_page[0];
1725
1726 /* Save intersting attributes from boot page */
1727 msb->block_count = boot_block->attr.number_of_blocks;
1728 msb->page_size = boot_block->attr.page_size;
1729
1730 msb->pages_in_block = boot_block->attr.block_size * 2;
1731 msb->block_size = msb->page_size * msb->pages_in_block;
1732
1733 if (msb->page_size > PAGE_SIZE) {
1734 /* this isn't supported by linux at all, anyway*/
1735 dbg("device page %d size isn't supported", msb->page_size);
1736 return -EINVAL;
1737 }
1738
1739 msb->block_buffer = kzalloc(msb->block_size, GFP_KERNEL);
1740 if (!msb->block_buffer)
1741 return -ENOMEM;
1742
1743 raw_size_in_megs = (msb->block_size * msb->block_count) >> 20;
1744
1745 for (i = 0; chs_table[i].size; i++) {
1746
1747 if (chs_table[i].size != raw_size_in_megs)
1748 continue;
1749
1750 msb->geometry.cylinders = chs_table[i].cyl;
1751 msb->geometry.heads = chs_table[i].head;
1752 msb->geometry.sectors = chs_table[i].sec;
1753 break;
1754 }
1755
1756 if (boot_block->attr.transfer_supporting == 1)
1757 msb->caps |= MEMSTICK_CAP_PAR4;
1758
1759 if (boot_block->attr.device_type & 0x03)
1760 msb->read_only = true;
1761
1762 dbg("Total block count = %d", msb->block_count);
1763 dbg("Each block consists of %d pages", msb->pages_in_block);
1764 dbg("Page size = %d bytes", msb->page_size);
1765 dbg("Parallel mode supported: %d", !!(msb->caps & MEMSTICK_CAP_PAR4));
1766 dbg("Read only: %d", msb->read_only);
1767
1768 #if 0
1769 /* Now we can switch the interface */
1770 if (host->caps & msb->caps & MEMSTICK_CAP_PAR4)
1771 msb_switch_to_parallel(msb);
1772 #endif
1773
1774 error = msb_cache_init(msb);
1775 if (error)
1776 return error;
1777
1778 error = msb_ftl_initialize(msb);
1779 if (error)
1780 return error;
1781
1782
1783 /* Read the bad block table */
1784 error = msb_read_bad_block_table(msb, 0);
1785
1786 if (error && error != -ENOMEM) {
1787 dbg("failed to read bad block table from primary boot block, trying from backup");
1788 error = msb_read_bad_block_table(msb, 1);
1789 }
1790
1791 if (error)
1792 return error;
1793
1794 /* *drum roll* Scan the media */
1795 error = msb_ftl_scan(msb);
1796 if (error) {
1797 pr_err("Scan of media failed");
1798 return error;
1799 }
1800
1801 return 0;
1802
1803 }
1804
1805 static int msb_do_write_request(struct msb_data *msb, int lba,
1806 int page, struct scatterlist *sg, size_t len, int *sucessfuly_written)
1807 {
1808 int error = 0;
1809 off_t offset = 0;
1810 *sucessfuly_written = 0;
1811
1812 while (offset < len) {
1813 if (page == 0 && len - offset >= msb->block_size) {
1814
1815 if (msb->cache_block_lba == lba)
1816 msb_cache_discard(msb);
1817
1818 dbg_verbose("Writing whole lba %d", lba);
1819 error = msb_update_block(msb, lba, sg, offset);
1820 if (error)
1821 return error;
1822
1823 offset += msb->block_size;
1824 *sucessfuly_written += msb->block_size;
1825 lba++;
1826 continue;
1827 }
1828
1829 error = msb_cache_write(msb, lba, page, false, sg, offset);
1830 if (error)
1831 return error;
1832
1833 offset += msb->page_size;
1834 *sucessfuly_written += msb->page_size;
1835
1836 page++;
1837 if (page == msb->pages_in_block) {
1838 page = 0;
1839 lba++;
1840 }
1841 }
1842 return 0;
1843 }
1844
1845 static int msb_do_read_request(struct msb_data *msb, int lba,
1846 int page, struct scatterlist *sg, int len, int *sucessfuly_read)
1847 {
1848 int error = 0;
1849 int offset = 0;
1850 *sucessfuly_read = 0;
1851
1852 while (offset < len) {
1853
1854 error = msb_cache_read(msb, lba, page, sg, offset);
1855 if (error)
1856 return error;
1857
1858 offset += msb->page_size;
1859 *sucessfuly_read += msb->page_size;
1860
1861 page++;
1862 if (page == msb->pages_in_block) {
1863 page = 0;
1864 lba++;
1865 }
1866 }
1867 return 0;
1868 }
1869
1870 static void msb_io_work(struct work_struct *work)
1871 {
1872 struct msb_data *msb = container_of(work, struct msb_data, io_work);
1873 int page, error, len;
1874 sector_t lba;
1875 unsigned long flags;
1876 struct scatterlist *sg = msb->prealloc_sg;
1877
1878 dbg_verbose("IO: work started");
1879
1880 while (1) {
1881 spin_lock_irqsave(&msb->q_lock, flags);
1882
1883 if (msb->need_flush_cache) {
1884 msb->need_flush_cache = false;
1885 spin_unlock_irqrestore(&msb->q_lock, flags);
1886 msb_cache_flush(msb);
1887 continue;
1888 }
1889
1890 if (!msb->req) {
1891 msb->req = blk_fetch_request(msb->queue);
1892 if (!msb->req) {
1893 dbg_verbose("IO: no more requests exiting");
1894 spin_unlock_irqrestore(&msb->q_lock, flags);
1895 return;
1896 }
1897 }
1898
1899 spin_unlock_irqrestore(&msb->q_lock, flags);
1900
1901 /* If card was removed meanwhile */
1902 if (!msb->req)
1903 return;
1904
1905 /* process the request */
1906 dbg_verbose("IO: processing new request");
1907 blk_rq_map_sg(msb->queue, msb->req, sg);
1908
1909 lba = blk_rq_pos(msb->req);
1910
1911 sector_div(lba, msb->page_size / 512);
1912 page = sector_div(lba, msb->pages_in_block);
1913
1914 if (rq_data_dir(msb->req) == READ)
1915 error = msb_do_read_request(msb, lba, page, sg,
1916 blk_rq_bytes(msb->req), &len);
1917 else
1918 error = msb_do_write_request(msb, lba, page, sg,
1919 blk_rq_bytes(msb->req), &len);
1920
1921 spin_lock_irqsave(&msb->q_lock, flags);
1922
1923 if (len)
1924 if (!__blk_end_request(msb->req, BLK_STS_OK, len))
1925 msb->req = NULL;
1926
1927 if (error && msb->req) {
1928 blk_status_t ret = errno_to_blk_status(error);
1929 dbg_verbose("IO: ending one sector of the request with error");
1930 if (!__blk_end_request(msb->req, ret, msb->page_size))
1931 msb->req = NULL;
1932 }
1933
1934 if (msb->req)
1935 dbg_verbose("IO: request still pending");
1936
1937 spin_unlock_irqrestore(&msb->q_lock, flags);
1938 }
1939 }
1940
1941 static DEFINE_IDR(msb_disk_idr); /*set of used disk numbers */
1942 static DEFINE_MUTEX(msb_disk_lock); /* protects against races in open/release */
1943
1944 static int msb_bd_open(struct block_device *bdev, fmode_t mode)
1945 {
1946 struct gendisk *disk = bdev->bd_disk;
1947 struct msb_data *msb = disk->private_data;
1948
1949 dbg_verbose("block device open");
1950
1951 mutex_lock(&msb_disk_lock);
1952
1953 if (msb && msb->card)
1954 msb->usage_count++;
1955
1956 mutex_unlock(&msb_disk_lock);
1957 return 0;
1958 }
1959
1960 static void msb_data_clear(struct msb_data *msb)
1961 {
1962 kfree(msb->boot_page);
1963 kfree(msb->used_blocks_bitmap);
1964 kfree(msb->lba_to_pba_table);
1965 kfree(msb->cache);
1966 msb->card = NULL;
1967 }
1968
1969 static int msb_disk_release(struct gendisk *disk)
1970 {
1971 struct msb_data *msb = disk->private_data;
1972
1973 dbg_verbose("block device release");
1974 mutex_lock(&msb_disk_lock);
1975
1976 if (msb) {
1977 if (msb->usage_count)
1978 msb->usage_count--;
1979
1980 if (!msb->usage_count) {
1981 disk->private_data = NULL;
1982 idr_remove(&msb_disk_idr, msb->disk_id);
1983 put_disk(disk);
1984 kfree(msb);
1985 }
1986 }
1987 mutex_unlock(&msb_disk_lock);
1988 return 0;
1989 }
1990
1991 static void msb_bd_release(struct gendisk *disk, fmode_t mode)
1992 {
1993 msb_disk_release(disk);
1994 }
1995
1996 static int msb_bd_getgeo(struct block_device *bdev,
1997 struct hd_geometry *geo)
1998 {
1999 struct msb_data *msb = bdev->bd_disk->private_data;
2000 *geo = msb->geometry;
2001 return 0;
2002 }
2003
2004 static void msb_submit_req(struct request_queue *q)
2005 {
2006 struct memstick_dev *card = q->queuedata;
2007 struct msb_data *msb = memstick_get_drvdata(card);
2008 struct request *req = NULL;
2009
2010 dbg_verbose("Submit request");
2011
2012 if (msb->card_dead) {
2013 dbg("Refusing requests on removed card");
2014
2015 WARN_ON(!msb->io_queue_stopped);
2016
2017 while ((req = blk_fetch_request(q)) != NULL)
2018 __blk_end_request_all(req, BLK_STS_IOERR);
2019 return;
2020 }
2021
2022 if (msb->req)
2023 return;
2024
2025 if (!msb->io_queue_stopped)
2026 queue_work(msb->io_queue, &msb->io_work);
2027 }
2028
2029 static int msb_check_card(struct memstick_dev *card)
2030 {
2031 struct msb_data *msb = memstick_get_drvdata(card);
2032 return (msb->card_dead == 0);
2033 }
2034
2035 static void msb_stop(struct memstick_dev *card)
2036 {
2037 struct msb_data *msb = memstick_get_drvdata(card);
2038 unsigned long flags;
2039
2040 dbg("Stopping all msblock IO");
2041
2042 spin_lock_irqsave(&msb->q_lock, flags);
2043 blk_stop_queue(msb->queue);
2044 msb->io_queue_stopped = true;
2045 spin_unlock_irqrestore(&msb->q_lock, flags);
2046
2047 del_timer_sync(&msb->cache_flush_timer);
2048 flush_workqueue(msb->io_queue);
2049
2050 if (msb->req) {
2051 spin_lock_irqsave(&msb->q_lock, flags);
2052 blk_requeue_request(msb->queue, msb->req);
2053 msb->req = NULL;
2054 spin_unlock_irqrestore(&msb->q_lock, flags);
2055 }
2056
2057 }
2058
2059 static void msb_start(struct memstick_dev *card)
2060 {
2061 struct msb_data *msb = memstick_get_drvdata(card);
2062 unsigned long flags;
2063
2064 dbg("Resuming IO from msblock");
2065
2066 msb_invalidate_reg_window(msb);
2067
2068 spin_lock_irqsave(&msb->q_lock, flags);
2069 if (!msb->io_queue_stopped || msb->card_dead) {
2070 spin_unlock_irqrestore(&msb->q_lock, flags);
2071 return;
2072 }
2073 spin_unlock_irqrestore(&msb->q_lock, flags);
2074
2075 /* Kick cache flush anyway, its harmless */
2076 msb->need_flush_cache = true;
2077 msb->io_queue_stopped = false;
2078
2079 spin_lock_irqsave(&msb->q_lock, flags);
2080 blk_start_queue(msb->queue);
2081 spin_unlock_irqrestore(&msb->q_lock, flags);
2082
2083 queue_work(msb->io_queue, &msb->io_work);
2084
2085 }
2086
2087 static const struct block_device_operations msb_bdops = {
2088 .open = msb_bd_open,
2089 .release = msb_bd_release,
2090 .getgeo = msb_bd_getgeo,
2091 .owner = THIS_MODULE
2092 };
2093
2094 /* Registers the block device */
2095 static int msb_init_disk(struct memstick_dev *card)
2096 {
2097 struct msb_data *msb = memstick_get_drvdata(card);
2098 struct memstick_host *host = card->host;
2099 int rc;
2100 u64 limit = BLK_BOUNCE_HIGH;
2101 unsigned long capacity;
2102
2103 if (host->dev.dma_mask && *(host->dev.dma_mask))
2104 limit = *(host->dev.dma_mask);
2105
2106 mutex_lock(&msb_disk_lock);
2107 msb->disk_id = idr_alloc(&msb_disk_idr, card, 0, 256, GFP_KERNEL);
2108 mutex_unlock(&msb_disk_lock);
2109
2110 if (msb->disk_id < 0)
2111 return msb->disk_id;
2112
2113 msb->disk = alloc_disk(0);
2114 if (!msb->disk) {
2115 rc = -ENOMEM;
2116 goto out_release_id;
2117 }
2118
2119 msb->queue = blk_init_queue(msb_submit_req, &msb->q_lock);
2120 if (!msb->queue) {
2121 rc = -ENOMEM;
2122 goto out_put_disk;
2123 }
2124
2125 msb->queue->queuedata = card;
2126
2127 blk_queue_bounce_limit(msb->queue, limit);
2128 blk_queue_max_hw_sectors(msb->queue, MS_BLOCK_MAX_PAGES);
2129 blk_queue_max_segments(msb->queue, MS_BLOCK_MAX_SEGS);
2130 blk_queue_max_segment_size(msb->queue,
2131 MS_BLOCK_MAX_PAGES * msb->page_size);
2132 blk_queue_logical_block_size(msb->queue, msb->page_size);
2133
2134 sprintf(msb->disk->disk_name, "msblk%d", msb->disk_id);
2135 msb->disk->fops = &msb_bdops;
2136 msb->disk->private_data = msb;
2137 msb->disk->queue = msb->queue;
2138 msb->disk->flags |= GENHD_FL_EXT_DEVT;
2139
2140 capacity = msb->pages_in_block * msb->logical_block_count;
2141 capacity *= (msb->page_size / 512);
2142 set_capacity(msb->disk, capacity);
2143 dbg("Set total disk size to %lu sectors", capacity);
2144
2145 msb->usage_count = 1;
2146 msb->io_queue = alloc_ordered_workqueue("ms_block", WQ_MEM_RECLAIM);
2147 INIT_WORK(&msb->io_work, msb_io_work);
2148 sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1);
2149
2150 if (msb->read_only)
2151 set_disk_ro(msb->disk, 1);
2152
2153 msb_start(card);
2154 device_add_disk(&card->dev, msb->disk);
2155 dbg("Disk added");
2156 return 0;
2157
2158 out_put_disk:
2159 put_disk(msb->disk);
2160 out_release_id:
2161 mutex_lock(&msb_disk_lock);
2162 idr_remove(&msb_disk_idr, msb->disk_id);
2163 mutex_unlock(&msb_disk_lock);
2164 return rc;
2165 }
2166
2167 static int msb_probe(struct memstick_dev *card)
2168 {
2169 struct msb_data *msb;
2170 int rc = 0;
2171
2172 msb = kzalloc(sizeof(struct msb_data), GFP_KERNEL);
2173 if (!msb)
2174 return -ENOMEM;
2175 memstick_set_drvdata(card, msb);
2176 msb->card = card;
2177 spin_lock_init(&msb->q_lock);
2178
2179 rc = msb_init_card(card);
2180 if (rc)
2181 goto out_free;
2182
2183 rc = msb_init_disk(card);
2184 if (!rc) {
2185 card->check = msb_check_card;
2186 card->stop = msb_stop;
2187 card->start = msb_start;
2188 return 0;
2189 }
2190 out_free:
2191 memstick_set_drvdata(card, NULL);
2192 msb_data_clear(msb);
2193 kfree(msb);
2194 return rc;
2195 }
2196
2197 static void msb_remove(struct memstick_dev *card)
2198 {
2199 struct msb_data *msb = memstick_get_drvdata(card);
2200 unsigned long flags;
2201
2202 if (!msb->io_queue_stopped)
2203 msb_stop(card);
2204
2205 dbg("Removing the disk device");
2206
2207 /* Take care of unhandled + new requests from now on */
2208 spin_lock_irqsave(&msb->q_lock, flags);
2209 msb->card_dead = true;
2210 blk_start_queue(msb->queue);
2211 spin_unlock_irqrestore(&msb->q_lock, flags);
2212
2213 /* Remove the disk */
2214 del_gendisk(msb->disk);
2215 blk_cleanup_queue(msb->queue);
2216 msb->queue = NULL;
2217
2218 mutex_lock(&msb_disk_lock);
2219 msb_data_clear(msb);
2220 mutex_unlock(&msb_disk_lock);
2221
2222 msb_disk_release(msb->disk);
2223 memstick_set_drvdata(card, NULL);
2224 }
2225
2226 #ifdef CONFIG_PM
2227
2228 static int msb_suspend(struct memstick_dev *card, pm_message_t state)
2229 {
2230 msb_stop(card);
2231 return 0;
2232 }
2233
2234 static int msb_resume(struct memstick_dev *card)
2235 {
2236 struct msb_data *msb = memstick_get_drvdata(card);
2237 struct msb_data *new_msb = NULL;
2238 bool card_dead = true;
2239
2240 #ifndef CONFIG_MEMSTICK_UNSAFE_RESUME
2241 msb->card_dead = true;
2242 return 0;
2243 #endif
2244 mutex_lock(&card->host->lock);
2245
2246 new_msb = kzalloc(sizeof(struct msb_data), GFP_KERNEL);
2247 if (!new_msb)
2248 goto out;
2249
2250 new_msb->card = card;
2251 memstick_set_drvdata(card, new_msb);
2252 spin_lock_init(&new_msb->q_lock);
2253 sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1);
2254
2255 if (msb_init_card(card))
2256 goto out;
2257
2258 if (msb->block_size != new_msb->block_size)
2259 goto out;
2260
2261 if (memcmp(msb->boot_page, new_msb->boot_page,
2262 sizeof(struct ms_boot_page)))
2263 goto out;
2264
2265 if (msb->logical_block_count != new_msb->logical_block_count ||
2266 memcmp(msb->lba_to_pba_table, new_msb->lba_to_pba_table,
2267 msb->logical_block_count))
2268 goto out;
2269
2270 if (msb->block_count != new_msb->block_count ||
2271 memcmp(msb->used_blocks_bitmap, new_msb->used_blocks_bitmap,
2272 msb->block_count / 8))
2273 goto out;
2274
2275 card_dead = false;
2276 out:
2277 if (card_dead)
2278 dbg("Card was removed/replaced during suspend");
2279
2280 msb->card_dead = card_dead;
2281 memstick_set_drvdata(card, msb);
2282
2283 if (new_msb) {
2284 msb_data_clear(new_msb);
2285 kfree(new_msb);
2286 }
2287
2288 msb_start(card);
2289 mutex_unlock(&card->host->lock);
2290 return 0;
2291 }
2292 #else
2293
2294 #define msb_suspend NULL
2295 #define msb_resume NULL
2296
2297 #endif /* CONFIG_PM */
2298
2299 static struct memstick_device_id msb_id_tbl[] = {
2300 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2301 MEMSTICK_CLASS_FLASH},
2302
2303 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2304 MEMSTICK_CLASS_ROM},
2305
2306 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2307 MEMSTICK_CLASS_RO},
2308
2309 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2310 MEMSTICK_CLASS_WP},
2311
2312 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_DUO, MEMSTICK_CATEGORY_STORAGE_DUO,
2313 MEMSTICK_CLASS_DUO},
2314 {}
2315 };
2316 MODULE_DEVICE_TABLE(memstick, msb_id_tbl);
2317
2318
2319 static struct memstick_driver msb_driver = {
2320 .driver = {
2321 .name = DRIVER_NAME,
2322 .owner = THIS_MODULE
2323 },
2324 .id_table = msb_id_tbl,
2325 .probe = msb_probe,
2326 .remove = msb_remove,
2327 .suspend = msb_suspend,
2328 .resume = msb_resume
2329 };
2330
2331 static int __init msb_init(void)
2332 {
2333 int rc = memstick_register_driver(&msb_driver);
2334 if (rc)
2335 pr_err("failed to register memstick driver (error %d)\n", rc);
2336
2337 return rc;
2338 }
2339
2340 static void __exit msb_exit(void)
2341 {
2342 memstick_unregister_driver(&msb_driver);
2343 idr_destroy(&msb_disk_idr);
2344 }
2345
2346 module_init(msb_init);
2347 module_exit(msb_exit);
2348
2349 module_param(cache_flush_timeout, int, S_IRUGO);
2350 MODULE_PARM_DESC(cache_flush_timeout,
2351 "Cache flush timeout in msec (1000 default)");
2352 module_param(debug, int, S_IRUGO | S_IWUSR);
2353 MODULE_PARM_DESC(debug, "Debug level (0-2)");
2354
2355 module_param(verify_writes, bool, S_IRUGO);
2356 MODULE_PARM_DESC(verify_writes, "Read back and check all data that is written");
2357
2358 MODULE_LICENSE("GPL");
2359 MODULE_AUTHOR("Maxim Levitsky");
2360 MODULE_DESCRIPTION("Sony MemoryStick block device driver");
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