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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(struct timer_list *t)
1496 {
1497 struct msb_data *msb = from_timer(msb, t, cache_flush_timer);
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 timer_setup(&msb->cache_flush_timer, msb_cache_flush_timer, 0);
1518
1519 if (!msb->cache)
1520 msb->cache = kzalloc(msb->block_size, GFP_KERNEL);
1521 if (!msb->cache)
1522 return -ENOMEM;
1523
1524 msb_cache_discard(msb);
1525 return 0;
1526 }
1527
1528 static int msb_cache_flush(struct msb_data *msb)
1529 {
1530 struct scatterlist sg;
1531 struct ms_extra_data_register extra;
1532 int page, offset, error;
1533 u16 pba, lba;
1534
1535 if (msb->read_only)
1536 return -EROFS;
1537
1538 if (msb->cache_block_lba == MS_BLOCK_INVALID)
1539 return 0;
1540
1541 lba = msb->cache_block_lba;
1542 pba = msb->lba_to_pba_table[lba];
1543
1544 dbg_verbose("Flushing the write cache of pba %d (LBA %d)",
1545 pba, msb->cache_block_lba);
1546
1547 sg_init_one(&sg, msb->cache , msb->block_size);
1548
1549 /* Read all missing pages in cache */
1550 for (page = 0; page < msb->pages_in_block; page++) {
1551
1552 if (test_bit(page, &msb->valid_cache_bitmap))
1553 continue;
1554
1555 offset = page * msb->page_size;
1556
1557 dbg_verbose("reading non-present sector %d of cache block %d",
1558 page, lba);
1559 error = msb_read_page(msb, pba, page, &extra, &sg, offset);
1560
1561 /* Bad pages are copied with 00 page status */
1562 if (error == -EBADMSG) {
1563 pr_err("read error on sector %d, contents probably damaged", page);
1564 continue;
1565 }
1566
1567 if (error)
1568 return error;
1569
1570 if ((extra.overwrite_flag & MEMSTICK_OV_PG_NORMAL) !=
1571 MEMSTICK_OV_PG_NORMAL) {
1572 dbg("page %d is marked as bad", page);
1573 continue;
1574 }
1575
1576 set_bit(page, &msb->valid_cache_bitmap);
1577 }
1578
1579 /* Write the cache now */
1580 error = msb_update_block(msb, msb->cache_block_lba, &sg, 0);
1581 pba = msb->lba_to_pba_table[msb->cache_block_lba];
1582
1583 /* Mark invalid pages */
1584 if (!error) {
1585 for (page = 0; page < msb->pages_in_block; page++) {
1586
1587 if (test_bit(page, &msb->valid_cache_bitmap))
1588 continue;
1589
1590 dbg("marking page %d as containing damaged data",
1591 page);
1592 msb_set_overwrite_flag(msb,
1593 pba , page, 0xFF & ~MEMSTICK_OV_PG_NORMAL);
1594 }
1595 }
1596
1597 msb_cache_discard(msb);
1598 return error;
1599 }
1600
1601 static int msb_cache_write(struct msb_data *msb, int lba,
1602 int page, bool add_to_cache_only, struct scatterlist *sg, int offset)
1603 {
1604 int error;
1605 struct scatterlist sg_tmp[10];
1606
1607 if (msb->read_only)
1608 return -EROFS;
1609
1610 if (msb->cache_block_lba == MS_BLOCK_INVALID ||
1611 lba != msb->cache_block_lba)
1612 if (add_to_cache_only)
1613 return 0;
1614
1615 /* If we need to write different block */
1616 if (msb->cache_block_lba != MS_BLOCK_INVALID &&
1617 lba != msb->cache_block_lba) {
1618 dbg_verbose("first flush the cache");
1619 error = msb_cache_flush(msb);
1620 if (error)
1621 return error;
1622 }
1623
1624 if (msb->cache_block_lba == MS_BLOCK_INVALID) {
1625 msb->cache_block_lba = lba;
1626 mod_timer(&msb->cache_flush_timer,
1627 jiffies + msecs_to_jiffies(cache_flush_timeout));
1628 }
1629
1630 dbg_verbose("Write of LBA %d page %d to cache ", lba, page);
1631
1632 sg_init_table(sg_tmp, ARRAY_SIZE(sg_tmp));
1633 msb_sg_copy(sg, sg_tmp, ARRAY_SIZE(sg_tmp), offset, msb->page_size);
1634
1635 sg_copy_to_buffer(sg_tmp, sg_nents(sg_tmp),
1636 msb->cache + page * msb->page_size, msb->page_size);
1637
1638 set_bit(page, &msb->valid_cache_bitmap);
1639 return 0;
1640 }
1641
1642 static int msb_cache_read(struct msb_data *msb, int lba,
1643 int page, struct scatterlist *sg, int offset)
1644 {
1645 int pba = msb->lba_to_pba_table[lba];
1646 struct scatterlist sg_tmp[10];
1647 int error = 0;
1648
1649 if (lba == msb->cache_block_lba &&
1650 test_bit(page, &msb->valid_cache_bitmap)) {
1651
1652 dbg_verbose("Read of LBA %d (pba %d) sector %d from cache",
1653 lba, pba, page);
1654
1655 sg_init_table(sg_tmp, ARRAY_SIZE(sg_tmp));
1656 msb_sg_copy(sg, sg_tmp, ARRAY_SIZE(sg_tmp),
1657 offset, msb->page_size);
1658 sg_copy_from_buffer(sg_tmp, sg_nents(sg_tmp),
1659 msb->cache + msb->page_size * page,
1660 msb->page_size);
1661 } else {
1662 dbg_verbose("Read of LBA %d (pba %d) sector %d from device",
1663 lba, pba, page);
1664
1665 error = msb_read_page(msb, pba, page, NULL, sg, offset);
1666 if (error)
1667 return error;
1668
1669 msb_cache_write(msb, lba, page, true, sg, offset);
1670 }
1671 return error;
1672 }
1673
1674 /* Emulated geometry table
1675 * This table content isn't that importaint,
1676 * One could put here different values, providing that they still
1677 * cover whole disk.
1678 * 64 MB entry is what windows reports for my 64M memstick */
1679
1680 static const struct chs_entry chs_table[] = {
1681 /* size sectors cylynders heads */
1682 { 4, 16, 247, 2 },
1683 { 8, 16, 495, 2 },
1684 { 16, 16, 495, 4 },
1685 { 32, 16, 991, 4 },
1686 { 64, 16, 991, 8 },
1687 {128, 16, 991, 16 },
1688 { 0 }
1689 };
1690
1691 /* Load information about the card */
1692 static int msb_init_card(struct memstick_dev *card)
1693 {
1694 struct msb_data *msb = memstick_get_drvdata(card);
1695 struct memstick_host *host = card->host;
1696 struct ms_boot_page *boot_block;
1697 int error = 0, i, raw_size_in_megs;
1698
1699 msb->caps = 0;
1700
1701 if (card->id.class >= MEMSTICK_CLASS_ROM &&
1702 card->id.class <= MEMSTICK_CLASS_ROM)
1703 msb->read_only = true;
1704
1705 msb->state = -1;
1706 error = msb_reset(msb, false);
1707 if (error)
1708 return error;
1709
1710 /* Due to a bug in Jmicron driver written by Alex Dubov,
1711 its serial mode barely works,
1712 so we switch to parallel mode right away */
1713 if (host->caps & MEMSTICK_CAP_PAR4)
1714 msb_switch_to_parallel(msb);
1715
1716 msb->page_size = sizeof(struct ms_boot_page);
1717
1718 /* Read the boot page */
1719 error = msb_read_boot_blocks(msb);
1720 if (error)
1721 return -EIO;
1722
1723 boot_block = &msb->boot_page[0];
1724
1725 /* Save intersting attributes from boot page */
1726 msb->block_count = boot_block->attr.number_of_blocks;
1727 msb->page_size = boot_block->attr.page_size;
1728
1729 msb->pages_in_block = boot_block->attr.block_size * 2;
1730 msb->block_size = msb->page_size * msb->pages_in_block;
1731
1732 if (msb->page_size > PAGE_SIZE) {
1733 /* this isn't supported by linux at all, anyway*/
1734 dbg("device page %d size isn't supported", msb->page_size);
1735 return -EINVAL;
1736 }
1737
1738 msb->block_buffer = kzalloc(msb->block_size, GFP_KERNEL);
1739 if (!msb->block_buffer)
1740 return -ENOMEM;
1741
1742 raw_size_in_megs = (msb->block_size * msb->block_count) >> 20;
1743
1744 for (i = 0; chs_table[i].size; i++) {
1745
1746 if (chs_table[i].size != raw_size_in_megs)
1747 continue;
1748
1749 msb->geometry.cylinders = chs_table[i].cyl;
1750 msb->geometry.heads = chs_table[i].head;
1751 msb->geometry.sectors = chs_table[i].sec;
1752 break;
1753 }
1754
1755 if (boot_block->attr.transfer_supporting == 1)
1756 msb->caps |= MEMSTICK_CAP_PAR4;
1757
1758 if (boot_block->attr.device_type & 0x03)
1759 msb->read_only = true;
1760
1761 dbg("Total block count = %d", msb->block_count);
1762 dbg("Each block consists of %d pages", msb->pages_in_block);
1763 dbg("Page size = %d bytes", msb->page_size);
1764 dbg("Parallel mode supported: %d", !!(msb->caps & MEMSTICK_CAP_PAR4));
1765 dbg("Read only: %d", msb->read_only);
1766
1767 #if 0
1768 /* Now we can switch the interface */
1769 if (host->caps & msb->caps & MEMSTICK_CAP_PAR4)
1770 msb_switch_to_parallel(msb);
1771 #endif
1772
1773 error = msb_cache_init(msb);
1774 if (error)
1775 return error;
1776
1777 error = msb_ftl_initialize(msb);
1778 if (error)
1779 return error;
1780
1781
1782 /* Read the bad block table */
1783 error = msb_read_bad_block_table(msb, 0);
1784
1785 if (error && error != -ENOMEM) {
1786 dbg("failed to read bad block table from primary boot block, trying from backup");
1787 error = msb_read_bad_block_table(msb, 1);
1788 }
1789
1790 if (error)
1791 return error;
1792
1793 /* *drum roll* Scan the media */
1794 error = msb_ftl_scan(msb);
1795 if (error) {
1796 pr_err("Scan of media failed");
1797 return error;
1798 }
1799
1800 return 0;
1801
1802 }
1803
1804 static int msb_do_write_request(struct msb_data *msb, int lba,
1805 int page, struct scatterlist *sg, size_t len, int *sucessfuly_written)
1806 {
1807 int error = 0;
1808 off_t offset = 0;
1809 *sucessfuly_written = 0;
1810
1811 while (offset < len) {
1812 if (page == 0 && len - offset >= msb->block_size) {
1813
1814 if (msb->cache_block_lba == lba)
1815 msb_cache_discard(msb);
1816
1817 dbg_verbose("Writing whole lba %d", lba);
1818 error = msb_update_block(msb, lba, sg, offset);
1819 if (error)
1820 return error;
1821
1822 offset += msb->block_size;
1823 *sucessfuly_written += msb->block_size;
1824 lba++;
1825 continue;
1826 }
1827
1828 error = msb_cache_write(msb, lba, page, false, sg, offset);
1829 if (error)
1830 return error;
1831
1832 offset += msb->page_size;
1833 *sucessfuly_written += msb->page_size;
1834
1835 page++;
1836 if (page == msb->pages_in_block) {
1837 page = 0;
1838 lba++;
1839 }
1840 }
1841 return 0;
1842 }
1843
1844 static int msb_do_read_request(struct msb_data *msb, int lba,
1845 int page, struct scatterlist *sg, int len, int *sucessfuly_read)
1846 {
1847 int error = 0;
1848 int offset = 0;
1849 *sucessfuly_read = 0;
1850
1851 while (offset < len) {
1852
1853 error = msb_cache_read(msb, lba, page, sg, offset);
1854 if (error)
1855 return error;
1856
1857 offset += msb->page_size;
1858 *sucessfuly_read += msb->page_size;
1859
1860 page++;
1861 if (page == msb->pages_in_block) {
1862 page = 0;
1863 lba++;
1864 }
1865 }
1866 return 0;
1867 }
1868
1869 static void msb_io_work(struct work_struct *work)
1870 {
1871 struct msb_data *msb = container_of(work, struct msb_data, io_work);
1872 int page, error, len;
1873 sector_t lba;
1874 unsigned long flags;
1875 struct scatterlist *sg = msb->prealloc_sg;
1876
1877 dbg_verbose("IO: work started");
1878
1879 while (1) {
1880 spin_lock_irqsave(&msb->q_lock, flags);
1881
1882 if (msb->need_flush_cache) {
1883 msb->need_flush_cache = false;
1884 spin_unlock_irqrestore(&msb->q_lock, flags);
1885 msb_cache_flush(msb);
1886 continue;
1887 }
1888
1889 if (!msb->req) {
1890 msb->req = blk_fetch_request(msb->queue);
1891 if (!msb->req) {
1892 dbg_verbose("IO: no more requests exiting");
1893 spin_unlock_irqrestore(&msb->q_lock, flags);
1894 return;
1895 }
1896 }
1897
1898 spin_unlock_irqrestore(&msb->q_lock, flags);
1899
1900 /* If card was removed meanwhile */
1901 if (!msb->req)
1902 return;
1903
1904 /* process the request */
1905 dbg_verbose("IO: processing new request");
1906 blk_rq_map_sg(msb->queue, msb->req, sg);
1907
1908 lba = blk_rq_pos(msb->req);
1909
1910 sector_div(lba, msb->page_size / 512);
1911 page = sector_div(lba, msb->pages_in_block);
1912
1913 if (rq_data_dir(msb->req) == READ)
1914 error = msb_do_read_request(msb, lba, page, sg,
1915 blk_rq_bytes(msb->req), &len);
1916 else
1917 error = msb_do_write_request(msb, lba, page, sg,
1918 blk_rq_bytes(msb->req), &len);
1919
1920 spin_lock_irqsave(&msb->q_lock, flags);
1921
1922 if (len)
1923 if (!__blk_end_request(msb->req, BLK_STS_OK, len))
1924 msb->req = NULL;
1925
1926 if (error && msb->req) {
1927 blk_status_t ret = errno_to_blk_status(error);
1928 dbg_verbose("IO: ending one sector of the request with error");
1929 if (!__blk_end_request(msb->req, ret, msb->page_size))
1930 msb->req = NULL;
1931 }
1932
1933 if (msb->req)
1934 dbg_verbose("IO: request still pending");
1935
1936 spin_unlock_irqrestore(&msb->q_lock, flags);
1937 }
1938 }
1939
1940 static DEFINE_IDR(msb_disk_idr); /*set of used disk numbers */
1941 static DEFINE_MUTEX(msb_disk_lock); /* protects against races in open/release */
1942
1943 static int msb_bd_open(struct block_device *bdev, fmode_t mode)
1944 {
1945 struct gendisk *disk = bdev->bd_disk;
1946 struct msb_data *msb = disk->private_data;
1947
1948 dbg_verbose("block device open");
1949
1950 mutex_lock(&msb_disk_lock);
1951
1952 if (msb && msb->card)
1953 msb->usage_count++;
1954
1955 mutex_unlock(&msb_disk_lock);
1956 return 0;
1957 }
1958
1959 static void msb_data_clear(struct msb_data *msb)
1960 {
1961 kfree(msb->boot_page);
1962 kfree(msb->used_blocks_bitmap);
1963 kfree(msb->lba_to_pba_table);
1964 kfree(msb->cache);
1965 msb->card = NULL;
1966 }
1967
1968 static int msb_disk_release(struct gendisk *disk)
1969 {
1970 struct msb_data *msb = disk->private_data;
1971
1972 dbg_verbose("block device release");
1973 mutex_lock(&msb_disk_lock);
1974
1975 if (msb) {
1976 if (msb->usage_count)
1977 msb->usage_count--;
1978
1979 if (!msb->usage_count) {
1980 disk->private_data = NULL;
1981 idr_remove(&msb_disk_idr, msb->disk_id);
1982 put_disk(disk);
1983 kfree(msb);
1984 }
1985 }
1986 mutex_unlock(&msb_disk_lock);
1987 return 0;
1988 }
1989
1990 static void msb_bd_release(struct gendisk *disk, fmode_t mode)
1991 {
1992 msb_disk_release(disk);
1993 }
1994
1995 static int msb_bd_getgeo(struct block_device *bdev,
1996 struct hd_geometry *geo)
1997 {
1998 struct msb_data *msb = bdev->bd_disk->private_data;
1999 *geo = msb->geometry;
2000 return 0;
2001 }
2002
2003 static void msb_submit_req(struct request_queue *q)
2004 {
2005 struct memstick_dev *card = q->queuedata;
2006 struct msb_data *msb = memstick_get_drvdata(card);
2007 struct request *req = NULL;
2008
2009 dbg_verbose("Submit request");
2010
2011 if (msb->card_dead) {
2012 dbg("Refusing requests on removed card");
2013
2014 WARN_ON(!msb->io_queue_stopped);
2015
2016 while ((req = blk_fetch_request(q)) != NULL)
2017 __blk_end_request_all(req, BLK_STS_IOERR);
2018 return;
2019 }
2020
2021 if (msb->req)
2022 return;
2023
2024 if (!msb->io_queue_stopped)
2025 queue_work(msb->io_queue, &msb->io_work);
2026 }
2027
2028 static int msb_check_card(struct memstick_dev *card)
2029 {
2030 struct msb_data *msb = memstick_get_drvdata(card);
2031 return (msb->card_dead == 0);
2032 }
2033
2034 static void msb_stop(struct memstick_dev *card)
2035 {
2036 struct msb_data *msb = memstick_get_drvdata(card);
2037 unsigned long flags;
2038
2039 dbg("Stopping all msblock IO");
2040
2041 spin_lock_irqsave(&msb->q_lock, flags);
2042 blk_stop_queue(msb->queue);
2043 msb->io_queue_stopped = true;
2044 spin_unlock_irqrestore(&msb->q_lock, flags);
2045
2046 del_timer_sync(&msb->cache_flush_timer);
2047 flush_workqueue(msb->io_queue);
2048
2049 if (msb->req) {
2050 spin_lock_irqsave(&msb->q_lock, flags);
2051 blk_requeue_request(msb->queue, msb->req);
2052 msb->req = NULL;
2053 spin_unlock_irqrestore(&msb->q_lock, flags);
2054 }
2055
2056 }
2057
2058 static void msb_start(struct memstick_dev *card)
2059 {
2060 struct msb_data *msb = memstick_get_drvdata(card);
2061 unsigned long flags;
2062
2063 dbg("Resuming IO from msblock");
2064
2065 msb_invalidate_reg_window(msb);
2066
2067 spin_lock_irqsave(&msb->q_lock, flags);
2068 if (!msb->io_queue_stopped || msb->card_dead) {
2069 spin_unlock_irqrestore(&msb->q_lock, flags);
2070 return;
2071 }
2072 spin_unlock_irqrestore(&msb->q_lock, flags);
2073
2074 /* Kick cache flush anyway, its harmless */
2075 msb->need_flush_cache = true;
2076 msb->io_queue_stopped = false;
2077
2078 spin_lock_irqsave(&msb->q_lock, flags);
2079 blk_start_queue(msb->queue);
2080 spin_unlock_irqrestore(&msb->q_lock, flags);
2081
2082 queue_work(msb->io_queue, &msb->io_work);
2083
2084 }
2085
2086 static const struct block_device_operations msb_bdops = {
2087 .open = msb_bd_open,
2088 .release = msb_bd_release,
2089 .getgeo = msb_bd_getgeo,
2090 .owner = THIS_MODULE
2091 };
2092
2093 /* Registers the block device */
2094 static int msb_init_disk(struct memstick_dev *card)
2095 {
2096 struct msb_data *msb = memstick_get_drvdata(card);
2097 struct memstick_host *host = card->host;
2098 int rc;
2099 u64 limit = BLK_BOUNCE_HIGH;
2100 unsigned long capacity;
2101
2102 if (host->dev.dma_mask && *(host->dev.dma_mask))
2103 limit = *(host->dev.dma_mask);
2104
2105 mutex_lock(&msb_disk_lock);
2106 msb->disk_id = idr_alloc(&msb_disk_idr, card, 0, 256, GFP_KERNEL);
2107 mutex_unlock(&msb_disk_lock);
2108
2109 if (msb->disk_id < 0)
2110 return msb->disk_id;
2111
2112 msb->disk = alloc_disk(0);
2113 if (!msb->disk) {
2114 rc = -ENOMEM;
2115 goto out_release_id;
2116 }
2117
2118 msb->queue = blk_init_queue(msb_submit_req, &msb->q_lock);
2119 if (!msb->queue) {
2120 rc = -ENOMEM;
2121 goto out_put_disk;
2122 }
2123
2124 msb->queue->queuedata = card;
2125
2126 blk_queue_bounce_limit(msb->queue, limit);
2127 blk_queue_max_hw_sectors(msb->queue, MS_BLOCK_MAX_PAGES);
2128 blk_queue_max_segments(msb->queue, MS_BLOCK_MAX_SEGS);
2129 blk_queue_max_segment_size(msb->queue,
2130 MS_BLOCK_MAX_PAGES * msb->page_size);
2131 blk_queue_logical_block_size(msb->queue, msb->page_size);
2132
2133 sprintf(msb->disk->disk_name, "msblk%d", msb->disk_id);
2134 msb->disk->fops = &msb_bdops;
2135 msb->disk->private_data = msb;
2136 msb->disk->queue = msb->queue;
2137 msb->disk->flags |= GENHD_FL_EXT_DEVT;
2138
2139 capacity = msb->pages_in_block * msb->logical_block_count;
2140 capacity *= (msb->page_size / 512);
2141 set_capacity(msb->disk, capacity);
2142 dbg("Set total disk size to %lu sectors", capacity);
2143
2144 msb->usage_count = 1;
2145 msb->io_queue = alloc_ordered_workqueue("ms_block", WQ_MEM_RECLAIM);
2146 INIT_WORK(&msb->io_work, msb_io_work);
2147 sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1);
2148
2149 if (msb->read_only)
2150 set_disk_ro(msb->disk, 1);
2151
2152 msb_start(card);
2153 device_add_disk(&card->dev, msb->disk);
2154 dbg("Disk added");
2155 return 0;
2156
2157 out_put_disk:
2158 put_disk(msb->disk);
2159 out_release_id:
2160 mutex_lock(&msb_disk_lock);
2161 idr_remove(&msb_disk_idr, msb->disk_id);
2162 mutex_unlock(&msb_disk_lock);
2163 return rc;
2164 }
2165
2166 static int msb_probe(struct memstick_dev *card)
2167 {
2168 struct msb_data *msb;
2169 int rc = 0;
2170
2171 msb = kzalloc(sizeof(struct msb_data), GFP_KERNEL);
2172 if (!msb)
2173 return -ENOMEM;
2174 memstick_set_drvdata(card, msb);
2175 msb->card = card;
2176 spin_lock_init(&msb->q_lock);
2177
2178 rc = msb_init_card(card);
2179 if (rc)
2180 goto out_free;
2181
2182 rc = msb_init_disk(card);
2183 if (!rc) {
2184 card->check = msb_check_card;
2185 card->stop = msb_stop;
2186 card->start = msb_start;
2187 return 0;
2188 }
2189 out_free:
2190 memstick_set_drvdata(card, NULL);
2191 msb_data_clear(msb);
2192 kfree(msb);
2193 return rc;
2194 }
2195
2196 static void msb_remove(struct memstick_dev *card)
2197 {
2198 struct msb_data *msb = memstick_get_drvdata(card);
2199 unsigned long flags;
2200
2201 if (!msb->io_queue_stopped)
2202 msb_stop(card);
2203
2204 dbg("Removing the disk device");
2205
2206 /* Take care of unhandled + new requests from now on */
2207 spin_lock_irqsave(&msb->q_lock, flags);
2208 msb->card_dead = true;
2209 blk_start_queue(msb->queue);
2210 spin_unlock_irqrestore(&msb->q_lock, flags);
2211
2212 /* Remove the disk */
2213 del_gendisk(msb->disk);
2214 blk_cleanup_queue(msb->queue);
2215 msb->queue = NULL;
2216
2217 mutex_lock(&msb_disk_lock);
2218 msb_data_clear(msb);
2219 mutex_unlock(&msb_disk_lock);
2220
2221 msb_disk_release(msb->disk);
2222 memstick_set_drvdata(card, NULL);
2223 }
2224
2225 #ifdef CONFIG_PM
2226
2227 static int msb_suspend(struct memstick_dev *card, pm_message_t state)
2228 {
2229 msb_stop(card);
2230 return 0;
2231 }
2232
2233 static int msb_resume(struct memstick_dev *card)
2234 {
2235 struct msb_data *msb = memstick_get_drvdata(card);
2236 struct msb_data *new_msb = NULL;
2237 bool card_dead = true;
2238
2239 #ifndef CONFIG_MEMSTICK_UNSAFE_RESUME
2240 msb->card_dead = true;
2241 return 0;
2242 #endif
2243 mutex_lock(&card->host->lock);
2244
2245 new_msb = kzalloc(sizeof(struct msb_data), GFP_KERNEL);
2246 if (!new_msb)
2247 goto out;
2248
2249 new_msb->card = card;
2250 memstick_set_drvdata(card, new_msb);
2251 spin_lock_init(&new_msb->q_lock);
2252 sg_init_table(msb->prealloc_sg, MS_BLOCK_MAX_SEGS+1);
2253
2254 if (msb_init_card(card))
2255 goto out;
2256
2257 if (msb->block_size != new_msb->block_size)
2258 goto out;
2259
2260 if (memcmp(msb->boot_page, new_msb->boot_page,
2261 sizeof(struct ms_boot_page)))
2262 goto out;
2263
2264 if (msb->logical_block_count != new_msb->logical_block_count ||
2265 memcmp(msb->lba_to_pba_table, new_msb->lba_to_pba_table,
2266 msb->logical_block_count))
2267 goto out;
2268
2269 if (msb->block_count != new_msb->block_count ||
2270 memcmp(msb->used_blocks_bitmap, new_msb->used_blocks_bitmap,
2271 msb->block_count / 8))
2272 goto out;
2273
2274 card_dead = false;
2275 out:
2276 if (card_dead)
2277 dbg("Card was removed/replaced during suspend");
2278
2279 msb->card_dead = card_dead;
2280 memstick_set_drvdata(card, msb);
2281
2282 if (new_msb) {
2283 msb_data_clear(new_msb);
2284 kfree(new_msb);
2285 }
2286
2287 msb_start(card);
2288 mutex_unlock(&card->host->lock);
2289 return 0;
2290 }
2291 #else
2292
2293 #define msb_suspend NULL
2294 #define msb_resume NULL
2295
2296 #endif /* CONFIG_PM */
2297
2298 static struct memstick_device_id msb_id_tbl[] = {
2299 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2300 MEMSTICK_CLASS_FLASH},
2301
2302 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2303 MEMSTICK_CLASS_ROM},
2304
2305 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2306 MEMSTICK_CLASS_RO},
2307
2308 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
2309 MEMSTICK_CLASS_WP},
2310
2311 {MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_DUO, MEMSTICK_CATEGORY_STORAGE_DUO,
2312 MEMSTICK_CLASS_DUO},
2313 {}
2314 };
2315 MODULE_DEVICE_TABLE(memstick, msb_id_tbl);
2316
2317
2318 static struct memstick_driver msb_driver = {
2319 .driver = {
2320 .name = DRIVER_NAME,
2321 .owner = THIS_MODULE
2322 },
2323 .id_table = msb_id_tbl,
2324 .probe = msb_probe,
2325 .remove = msb_remove,
2326 .suspend = msb_suspend,
2327 .resume = msb_resume
2328 };
2329
2330 static int __init msb_init(void)
2331 {
2332 int rc = memstick_register_driver(&msb_driver);
2333 if (rc)
2334 pr_err("failed to register memstick driver (error %d)\n", rc);
2335
2336 return rc;
2337 }
2338
2339 static void __exit msb_exit(void)
2340 {
2341 memstick_unregister_driver(&msb_driver);
2342 idr_destroy(&msb_disk_idr);
2343 }
2344
2345 module_init(msb_init);
2346 module_exit(msb_exit);
2347
2348 module_param(cache_flush_timeout, int, S_IRUGO);
2349 MODULE_PARM_DESC(cache_flush_timeout,
2350 "Cache flush timeout in msec (1000 default)");
2351 module_param(debug, int, S_IRUGO | S_IWUSR);
2352 MODULE_PARM_DESC(debug, "Debug level (0-2)");
2353
2354 module_param(verify_writes, bool, S_IRUGO);
2355 MODULE_PARM_DESC(verify_writes, "Read back and check all data that is written");
2356
2357 MODULE_LICENSE("GPL");
2358 MODULE_AUTHOR("Maxim Levitsky");
2359 MODULE_DESCRIPTION("Sony MemoryStick block device driver");
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