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13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/completion.h>
17#include <linux/device.h>
18#include <linux/delay.h>
19#include <linux/pagemap.h>
20#include <linux/err.h>
21#include <linux/leds.h>
22#include <linux/scatterlist.h>
23#include <linux/log2.h>
24#include <linux/regulator/consumer.h>
25#include <linux/pm_runtime.h>
26#include <linux/pm_wakeup.h>
27#include <linux/suspend.h>
28#include <linux/fault-inject.h>
29#include <linux/random.h>
30#include <linux/slab.h>
31#include <linux/of.h>
32
33#include <linux/mmc/card.h>
34#include <linux/mmc/host.h>
35#include <linux/mmc/mmc.h>
36#include <linux/mmc/sd.h>
37#include <linux/mmc/slot-gpio.h>
38
39#define CREATE_TRACE_POINTS
40#include <trace/events/mmc.h>
41
42#include "core.h"
43#include "bus.h"
44#include "host.h"
45#include "sdio_bus.h"
46#include "pwrseq.h"
47
48#include "mmc_ops.h"
49#include "sd_ops.h"
50#include "sdio_ops.h"
51
52
53#define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000)
54
55
56
57
58
59#define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000)
60
61
62#define MMC_ERASE_TIMEOUT_MS (60 * 1000)
63
64static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
65
66
67
68
69
70
71bool use_spi_crc = 1;
72module_param(use_spi_crc, bool, 0);
73
74static int mmc_schedule_delayed_work(struct delayed_work *work,
75 unsigned long delay)
76{
77
78
79
80
81
82
83 return queue_delayed_work(system_freezable_wq, work, delay);
84}
85
86#ifdef CONFIG_FAIL_MMC_REQUEST
87
88
89
90
91
92static void mmc_should_fail_request(struct mmc_host *host,
93 struct mmc_request *mrq)
94{
95 struct mmc_command *cmd = mrq->cmd;
96 struct mmc_data *data = mrq->data;
97 static const int data_errors[] = {
98 -ETIMEDOUT,
99 -EILSEQ,
100 -EIO,
101 };
102
103 if (!data)
104 return;
105
106 if (cmd->error || data->error ||
107 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
108 return;
109
110 data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
111 data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
112}
113
114#else
115
116static inline void mmc_should_fail_request(struct mmc_host *host,
117 struct mmc_request *mrq)
118{
119}
120
121#endif
122
123static inline void mmc_complete_cmd(struct mmc_request *mrq)
124{
125 if (mrq->cap_cmd_during_tfr && !completion_done(&mrq->cmd_completion))
126 complete_all(&mrq->cmd_completion);
127}
128
129void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq)
130{
131 if (!mrq->cap_cmd_during_tfr)
132 return;
133
134 mmc_complete_cmd(mrq);
135
136 pr_debug("%s: cmd done, tfr ongoing (CMD%u)\n",
137 mmc_hostname(host), mrq->cmd->opcode);
138}
139EXPORT_SYMBOL(mmc_command_done);
140
141
142
143
144
145
146
147
148
149void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
150{
151 struct mmc_command *cmd = mrq->cmd;
152 int err = cmd->error;
153
154
155 if ((cmd->opcode != MMC_SEND_TUNING_BLOCK &&
156 cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
157 (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
158 (mrq->data && mrq->data->error == -EILSEQ) ||
159 (mrq->stop && mrq->stop->error == -EILSEQ)))
160 mmc_retune_needed(host);
161
162 if (err && cmd->retries && mmc_host_is_spi(host)) {
163 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
164 cmd->retries = 0;
165 }
166
167 if (host->ongoing_mrq == mrq)
168 host->ongoing_mrq = NULL;
169
170 mmc_complete_cmd(mrq);
171
172 trace_mmc_request_done(host, mrq);
173
174 if (err && cmd->retries && !mmc_card_removed(host->card)) {
175
176
177
178
179 if (mrq->done)
180 mrq->done(mrq);
181 } else {
182 mmc_should_fail_request(host, mrq);
183
184 if (!host->ongoing_mrq)
185 led_trigger_event(host->led, LED_OFF);
186
187 if (mrq->sbc) {
188 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
189 mmc_hostname(host), mrq->sbc->opcode,
190 mrq->sbc->error,
191 mrq->sbc->resp[0], mrq->sbc->resp[1],
192 mrq->sbc->resp[2], mrq->sbc->resp[3]);
193 }
194
195 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
196 mmc_hostname(host), cmd->opcode, err,
197 cmd->resp[0], cmd->resp[1],
198 cmd->resp[2], cmd->resp[3]);
199
200 if (mrq->data) {
201 pr_debug("%s: %d bytes transferred: %d\n",
202 mmc_hostname(host),
203 mrq->data->bytes_xfered, mrq->data->error);
204 }
205
206 if (mrq->stop) {
207 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
208 mmc_hostname(host), mrq->stop->opcode,
209 mrq->stop->error,
210 mrq->stop->resp[0], mrq->stop->resp[1],
211 mrq->stop->resp[2], mrq->stop->resp[3]);
212 }
213
214 if (mrq->done)
215 mrq->done(mrq);
216 }
217}
218
219EXPORT_SYMBOL(mmc_request_done);
220
221static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
222{
223 int err;
224
225
226 err = mmc_retune(host);
227 if (err) {
228 mrq->cmd->error = err;
229 mmc_request_done(host, mrq);
230 return;
231 }
232
233
234
235
236
237 if (mmc_is_io_op(mrq->cmd->opcode) && host->ops->card_busy) {
238 int tries = 500;
239
240 while (host->ops->card_busy(host) && --tries)
241 mmc_delay(1);
242
243 if (tries == 0) {
244 mrq->cmd->error = -EBUSY;
245 mmc_request_done(host, mrq);
246 return;
247 }
248 }
249
250 if (mrq->cap_cmd_during_tfr) {
251 host->ongoing_mrq = mrq;
252
253
254
255
256 reinit_completion(&mrq->cmd_completion);
257 }
258
259 trace_mmc_request_start(host, mrq);
260
261 host->ops->request(host, mrq);
262}
263
264static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
265{
266#ifdef CONFIG_MMC_DEBUG
267 unsigned int i, sz;
268 struct scatterlist *sg;
269#endif
270 mmc_retune_hold(host);
271
272 if (mmc_card_removed(host->card))
273 return -ENOMEDIUM;
274
275 if (mrq->sbc) {
276 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
277 mmc_hostname(host), mrq->sbc->opcode,
278 mrq->sbc->arg, mrq->sbc->flags);
279 }
280
281 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
282 mmc_hostname(host), mrq->cmd->opcode,
283 mrq->cmd->arg, mrq->cmd->flags);
284
285 if (mrq->data) {
286 pr_debug("%s: blksz %d blocks %d flags %08x "
287 "tsac %d ms nsac %d\n",
288 mmc_hostname(host), mrq->data->blksz,
289 mrq->data->blocks, mrq->data->flags,
290 mrq->data->timeout_ns / 1000000,
291 mrq->data->timeout_clks);
292 }
293
294 if (mrq->stop) {
295 pr_debug("%s: CMD%u arg %08x flags %08x\n",
296 mmc_hostname(host), mrq->stop->opcode,
297 mrq->stop->arg, mrq->stop->flags);
298 }
299
300 WARN_ON(!host->claimed);
301
302 mrq->cmd->error = 0;
303 mrq->cmd->mrq = mrq;
304 if (mrq->sbc) {
305 mrq->sbc->error = 0;
306 mrq->sbc->mrq = mrq;
307 }
308 if (mrq->data) {
309 BUG_ON(mrq->data->blksz > host->max_blk_size);
310 BUG_ON(mrq->data->blocks > host->max_blk_count);
311 BUG_ON(mrq->data->blocks * mrq->data->blksz >
312 host->max_req_size);
313
314#ifdef CONFIG_MMC_DEBUG
315 sz = 0;
316 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
317 sz += sg->length;
318 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
319#endif
320
321 mrq->cmd->data = mrq->data;
322 mrq->data->error = 0;
323 mrq->data->mrq = mrq;
324 if (mrq->stop) {
325 mrq->data->stop = mrq->stop;
326 mrq->stop->error = 0;
327 mrq->stop->mrq = mrq;
328 }
329 }
330 led_trigger_event(host->led, LED_FULL);
331 __mmc_start_request(host, mrq);
332
333 return 0;
334}
335
336
337
338
339
340
341
342
343
344
345
346void mmc_start_bkops(struct mmc_card *card, bool from_exception)
347{
348 int err;
349 int timeout;
350 bool use_busy_signal;
351
352 BUG_ON(!card);
353
354 if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
355 return;
356
357 err = mmc_read_bkops_status(card);
358 if (err) {
359 pr_err("%s: Failed to read bkops status: %d\n",
360 mmc_hostname(card->host), err);
361 return;
362 }
363
364 if (!card->ext_csd.raw_bkops_status)
365 return;
366
367 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
368 from_exception)
369 return;
370
371 mmc_claim_host(card->host);
372 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
373 timeout = MMC_BKOPS_MAX_TIMEOUT;
374 use_busy_signal = true;
375 } else {
376 timeout = 0;
377 use_busy_signal = false;
378 }
379
380 mmc_retune_hold(card->host);
381
382 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
383 EXT_CSD_BKOPS_START, 1, timeout,
384 use_busy_signal, true, false);
385 if (err) {
386 pr_warn("%s: Error %d starting bkops\n",
387 mmc_hostname(card->host), err);
388 mmc_retune_release(card->host);
389 goto out;
390 }
391
392
393
394
395
396
397 if (!use_busy_signal)
398 mmc_card_set_doing_bkops(card);
399 else
400 mmc_retune_release(card->host);
401out:
402 mmc_release_host(card->host);
403}
404EXPORT_SYMBOL(mmc_start_bkops);
405
406
407
408
409
410
411
412static void mmc_wait_data_done(struct mmc_request *mrq)
413{
414 struct mmc_context_info *context_info = &mrq->host->context_info;
415
416 context_info->is_done_rcv = true;
417 wake_up_interruptible(&context_info->wait);
418}
419
420static void mmc_wait_done(struct mmc_request *mrq)
421{
422 complete(&mrq->completion);
423}
424
425static inline void mmc_wait_ongoing_tfr_cmd(struct mmc_host *host)
426{
427 struct mmc_request *ongoing_mrq = READ_ONCE(host->ongoing_mrq);
428
429
430
431
432
433 if (ongoing_mrq && !completion_done(&ongoing_mrq->cmd_completion))
434 wait_for_completion(&ongoing_mrq->cmd_completion);
435}
436
437
438
439
440
441
442
443
444
445
446
447static int __mmc_start_data_req(struct mmc_host *host, struct mmc_request *mrq)
448{
449 int err;
450
451 mmc_wait_ongoing_tfr_cmd(host);
452
453 mrq->done = mmc_wait_data_done;
454 mrq->host = host;
455
456 init_completion(&mrq->cmd_completion);
457
458 err = mmc_start_request(host, mrq);
459 if (err) {
460 mrq->cmd->error = err;
461 mmc_complete_cmd(mrq);
462 mmc_wait_data_done(mrq);
463 }
464
465 return err;
466}
467
468static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
469{
470 int err;
471
472 mmc_wait_ongoing_tfr_cmd(host);
473
474 init_completion(&mrq->completion);
475 mrq->done = mmc_wait_done;
476
477 init_completion(&mrq->cmd_completion);
478
479 err = mmc_start_request(host, mrq);
480 if (err) {
481 mrq->cmd->error = err;
482 mmc_complete_cmd(mrq);
483 complete(&mrq->completion);
484 }
485
486 return err;
487}
488
489
490
491
492
493
494
495
496
497
498
499
500static int mmc_wait_for_data_req_done(struct mmc_host *host,
501 struct mmc_request *mrq,
502 struct mmc_async_req *next_req)
503{
504 struct mmc_command *cmd;
505 struct mmc_context_info *context_info = &host->context_info;
506 int err;
507 unsigned long flags;
508
509 while (1) {
510 wait_event_interruptible(context_info->wait,
511 (context_info->is_done_rcv ||
512 context_info->is_new_req));
513 spin_lock_irqsave(&context_info->lock, flags);
514 context_info->is_waiting_last_req = false;
515 spin_unlock_irqrestore(&context_info->lock, flags);
516 if (context_info->is_done_rcv) {
517 context_info->is_done_rcv = false;
518 context_info->is_new_req = false;
519 cmd = mrq->cmd;
520
521 if (!cmd->error || !cmd->retries ||
522 mmc_card_removed(host->card)) {
523 err = host->areq->err_check(host->card,
524 host->areq);
525 break;
526 } else {
527 mmc_retune_recheck(host);
528 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
529 mmc_hostname(host),
530 cmd->opcode, cmd->error);
531 cmd->retries--;
532 cmd->error = 0;
533 __mmc_start_request(host, mrq);
534 continue;
535 }
536 } else if (context_info->is_new_req) {
537 context_info->is_new_req = false;
538 if (!next_req)
539 return MMC_BLK_NEW_REQUEST;
540 }
541 }
542 mmc_retune_release(host);
543 return err;
544}
545
546void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq)
547{
548 struct mmc_command *cmd;
549
550 while (1) {
551 wait_for_completion(&mrq->completion);
552
553 cmd = mrq->cmd;
554
555
556
557
558
559
560
561 if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
562 if (!mmc_interrupt_hpi(host->card)) {
563 pr_warn("%s: %s: Interrupted sanitize\n",
564 mmc_hostname(host), __func__);
565 cmd->error = 0;
566 break;
567 } else {
568 pr_err("%s: %s: Failed to interrupt sanitize\n",
569 mmc_hostname(host), __func__);
570 }
571 }
572 if (!cmd->error || !cmd->retries ||
573 mmc_card_removed(host->card))
574 break;
575
576 mmc_retune_recheck(host);
577
578 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
579 mmc_hostname(host), cmd->opcode, cmd->error);
580 cmd->retries--;
581 cmd->error = 0;
582 __mmc_start_request(host, mrq);
583 }
584
585 mmc_retune_release(host);
586}
587EXPORT_SYMBOL(mmc_wait_for_req_done);
588
589
590
591
592
593
594
595
596
597
598
599
600
601bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq)
602{
603 if (host->areq)
604 return host->context_info.is_done_rcv;
605 else
606 return completion_done(&mrq->completion);
607}
608EXPORT_SYMBOL(mmc_is_req_done);
609
610
611
612
613
614
615
616
617
618
619
620
621static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
622 bool is_first_req)
623{
624 if (host->ops->pre_req)
625 host->ops->pre_req(host, mrq, is_first_req);
626}
627
628
629
630
631
632
633
634
635
636
637static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
638 int err)
639{
640 if (host->ops->post_req)
641 host->ops->post_req(host, mrq, err);
642}
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660struct mmc_async_req *mmc_start_req(struct mmc_host *host,
661 struct mmc_async_req *areq, int *error)
662{
663 int err = 0;
664 int start_err = 0;
665 struct mmc_async_req *data = host->areq;
666
667
668 if (areq)
669 mmc_pre_req(host, areq->mrq, !host->areq);
670
671 if (host->areq) {
672 err = mmc_wait_for_data_req_done(host, host->areq->mrq, areq);
673 if (err == MMC_BLK_NEW_REQUEST) {
674 if (error)
675 *error = err;
676
677
678
679
680 return NULL;
681 }
682
683
684
685 if (host->card && mmc_card_mmc(host->card) &&
686 ((mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1) ||
687 (mmc_resp_type(host->areq->mrq->cmd) == MMC_RSP_R1B)) &&
688 (host->areq->mrq->cmd->resp[0] & R1_EXCEPTION_EVENT)) {
689
690
691 if (areq)
692 mmc_post_req(host, areq->mrq, -EINVAL);
693
694 mmc_start_bkops(host->card, true);
695
696
697 if (areq)
698 mmc_pre_req(host, areq->mrq, !host->areq);
699 }
700 }
701
702 if (!err && areq)
703 start_err = __mmc_start_data_req(host, areq->mrq);
704
705 if (host->areq)
706 mmc_post_req(host, host->areq->mrq, 0);
707
708
709 if ((err || start_err) && areq)
710 mmc_post_req(host, areq->mrq, -EINVAL);
711
712 if (err)
713 host->areq = NULL;
714 else
715 host->areq = areq;
716
717 if (error)
718 *error = err;
719 return data;
720}
721EXPORT_SYMBOL(mmc_start_req);
722
723
724
725
726
727
728
729
730
731
732
733
734
735void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
736{
737 __mmc_start_req(host, mrq);
738
739 if (!mrq->cap_cmd_during_tfr)
740 mmc_wait_for_req_done(host, mrq);
741}
742EXPORT_SYMBOL(mmc_wait_for_req);
743
744
745
746
747
748
749
750
751int mmc_interrupt_hpi(struct mmc_card *card)
752{
753 int err;
754 u32 status;
755 unsigned long prg_wait;
756
757 BUG_ON(!card);
758
759 if (!card->ext_csd.hpi_en) {
760 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
761 return 1;
762 }
763
764 mmc_claim_host(card->host);
765 err = mmc_send_status(card, &status);
766 if (err) {
767 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
768 goto out;
769 }
770
771 switch (R1_CURRENT_STATE(status)) {
772 case R1_STATE_IDLE:
773 case R1_STATE_READY:
774 case R1_STATE_STBY:
775 case R1_STATE_TRAN:
776
777
778
779
780 goto out;
781 case R1_STATE_PRG:
782 break;
783 default:
784
785 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
786 mmc_hostname(card->host), R1_CURRENT_STATE(status));
787 err = -EINVAL;
788 goto out;
789 }
790
791 err = mmc_send_hpi_cmd(card, &status);
792 if (err)
793 goto out;
794
795 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
796 do {
797 err = mmc_send_status(card, &status);
798
799 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
800 break;
801 if (time_after(jiffies, prg_wait))
802 err = -ETIMEDOUT;
803 } while (!err);
804
805out:
806 mmc_release_host(card->host);
807 return err;
808}
809EXPORT_SYMBOL(mmc_interrupt_hpi);
810
811
812
813
814
815
816
817
818
819
820
821int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
822{
823 struct mmc_request mrq = {NULL};
824
825 WARN_ON(!host->claimed);
826
827 memset(cmd->resp, 0, sizeof(cmd->resp));
828 cmd->retries = retries;
829
830 mrq.cmd = cmd;
831 cmd->data = NULL;
832
833 mmc_wait_for_req(host, &mrq);
834
835 return cmd->error;
836}
837
838EXPORT_SYMBOL(mmc_wait_for_cmd);
839
840
841
842
843
844
845
846
847
848
849int mmc_stop_bkops(struct mmc_card *card)
850{
851 int err = 0;
852
853 BUG_ON(!card);
854 err = mmc_interrupt_hpi(card);
855
856
857
858
859
860 if (!err || (err == -EINVAL)) {
861 mmc_card_clr_doing_bkops(card);
862 mmc_retune_release(card->host);
863 err = 0;
864 }
865
866 return err;
867}
868EXPORT_SYMBOL(mmc_stop_bkops);
869
870int mmc_read_bkops_status(struct mmc_card *card)
871{
872 int err;
873 u8 *ext_csd;
874
875 mmc_claim_host(card->host);
876 err = mmc_get_ext_csd(card, &ext_csd);
877 mmc_release_host(card->host);
878 if (err)
879 return err;
880
881 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
882 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
883 kfree(ext_csd);
884 return 0;
885}
886EXPORT_SYMBOL(mmc_read_bkops_status);
887
888
889
890
891
892
893
894
895
896void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
897{
898 unsigned int mult;
899
900
901
902
903 if (mmc_card_sdio(card)) {
904 data->timeout_ns = 1000000000;
905 data->timeout_clks = 0;
906 return;
907 }
908
909
910
911
912 mult = mmc_card_sd(card) ? 100 : 10;
913
914
915
916
917
918 if (data->flags & MMC_DATA_WRITE)
919 mult <<= card->csd.r2w_factor;
920
921 data->timeout_ns = card->csd.tacc_ns * mult;
922 data->timeout_clks = card->csd.tacc_clks * mult;
923
924
925
926
927 if (mmc_card_sd(card)) {
928 unsigned int timeout_us, limit_us;
929
930 timeout_us = data->timeout_ns / 1000;
931 if (card->host->ios.clock)
932 timeout_us += data->timeout_clks * 1000 /
933 (card->host->ios.clock / 1000);
934
935 if (data->flags & MMC_DATA_WRITE)
936
937
938
939
940
941
942
943
944 limit_us = 3000000;
945 else
946 limit_us = 100000;
947
948
949
950
951 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
952 data->timeout_ns = limit_us * 1000;
953 data->timeout_clks = 0;
954 }
955
956
957 if (timeout_us == 0)
958 data->timeout_ns = limit_us * 1000;
959 }
960
961
962
963
964
965
966
967 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
968 data->timeout_ns = 600000000;
969 data->timeout_clks = 0;
970 }
971
972
973
974
975
976
977
978 if (mmc_host_is_spi(card->host)) {
979 if (data->flags & MMC_DATA_WRITE) {
980 if (data->timeout_ns < 1000000000)
981 data->timeout_ns = 1000000000;
982 } else {
983 if (data->timeout_ns < 100000000)
984 data->timeout_ns = 100000000;
985 }
986 }
987}
988EXPORT_SYMBOL(mmc_set_data_timeout);
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
1005{
1006
1007
1008
1009
1010
1011 sz = ((sz + 3) / 4) * 4;
1012
1013 return sz;
1014}
1015EXPORT_SYMBOL(mmc_align_data_size);
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
1028{
1029 DECLARE_WAITQUEUE(wait, current);
1030 unsigned long flags;
1031 int stop;
1032 bool pm = false;
1033
1034 might_sleep();
1035
1036 add_wait_queue(&host->wq, &wait);
1037 spin_lock_irqsave(&host->lock, flags);
1038 while (1) {
1039 set_current_state(TASK_UNINTERRUPTIBLE);
1040 stop = abort ? atomic_read(abort) : 0;
1041 if (stop || !host->claimed || host->claimer == current)
1042 break;
1043 spin_unlock_irqrestore(&host->lock, flags);
1044 schedule();
1045 spin_lock_irqsave(&host->lock, flags);
1046 }
1047 set_current_state(TASK_RUNNING);
1048 if (!stop) {
1049 host->claimed = 1;
1050 host->claimer = current;
1051 host->claim_cnt += 1;
1052 if (host->claim_cnt == 1)
1053 pm = true;
1054 } else
1055 wake_up(&host->wq);
1056 spin_unlock_irqrestore(&host->lock, flags);
1057 remove_wait_queue(&host->wq, &wait);
1058
1059 if (pm)
1060 pm_runtime_get_sync(mmc_dev(host));
1061
1062 return stop;
1063}
1064EXPORT_SYMBOL(__mmc_claim_host);
1065
1066
1067
1068
1069
1070
1071
1072
1073void mmc_release_host(struct mmc_host *host)
1074{
1075 unsigned long flags;
1076
1077 WARN_ON(!host->claimed);
1078
1079 spin_lock_irqsave(&host->lock, flags);
1080 if (--host->claim_cnt) {
1081
1082 spin_unlock_irqrestore(&host->lock, flags);
1083 } else {
1084 host->claimed = 0;
1085 host->claimer = NULL;
1086 spin_unlock_irqrestore(&host->lock, flags);
1087 wake_up(&host->wq);
1088 pm_runtime_mark_last_busy(mmc_dev(host));
1089 pm_runtime_put_autosuspend(mmc_dev(host));
1090 }
1091}
1092EXPORT_SYMBOL(mmc_release_host);
1093
1094
1095
1096
1097
1098void mmc_get_card(struct mmc_card *card)
1099{
1100 pm_runtime_get_sync(&card->dev);
1101 mmc_claim_host(card->host);
1102}
1103EXPORT_SYMBOL(mmc_get_card);
1104
1105
1106
1107
1108
1109void mmc_put_card(struct mmc_card *card)
1110{
1111 mmc_release_host(card->host);
1112 pm_runtime_mark_last_busy(&card->dev);
1113 pm_runtime_put_autosuspend(&card->dev);
1114}
1115EXPORT_SYMBOL(mmc_put_card);
1116
1117
1118
1119
1120
1121static inline void mmc_set_ios(struct mmc_host *host)
1122{
1123 struct mmc_ios *ios = &host->ios;
1124
1125 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1126 "width %u timing %u\n",
1127 mmc_hostname(host), ios->clock, ios->bus_mode,
1128 ios->power_mode, ios->chip_select, ios->vdd,
1129 1 << ios->bus_width, ios->timing);
1130
1131 host->ops->set_ios(host, ios);
1132}
1133
1134
1135
1136
1137void mmc_set_chip_select(struct mmc_host *host, int mode)
1138{
1139 host->ios.chip_select = mode;
1140 mmc_set_ios(host);
1141}
1142
1143
1144
1145
1146
1147void mmc_set_clock(struct mmc_host *host, unsigned int hz)
1148{
1149 WARN_ON(hz && hz < host->f_min);
1150
1151 if (hz > host->f_max)
1152 hz = host->f_max;
1153
1154 host->ios.clock = hz;
1155 mmc_set_ios(host);
1156}
1157
1158int mmc_execute_tuning(struct mmc_card *card)
1159{
1160 struct mmc_host *host = card->host;
1161 u32 opcode;
1162 int err;
1163
1164 if (!host->ops->execute_tuning)
1165 return 0;
1166
1167 if (mmc_card_mmc(card))
1168 opcode = MMC_SEND_TUNING_BLOCK_HS200;
1169 else
1170 opcode = MMC_SEND_TUNING_BLOCK;
1171
1172 err = host->ops->execute_tuning(host, opcode);
1173
1174 if (err)
1175 pr_err("%s: tuning execution failed: %d\n",
1176 mmc_hostname(host), err);
1177 else
1178 mmc_retune_enable(host);
1179
1180 return err;
1181}
1182
1183
1184
1185
1186void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
1187{
1188 host->ios.bus_mode = mode;
1189 mmc_set_ios(host);
1190}
1191
1192
1193
1194
1195void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
1196{
1197 host->ios.bus_width = width;
1198 mmc_set_ios(host);
1199}
1200
1201
1202
1203
1204void mmc_set_initial_state(struct mmc_host *host)
1205{
1206 mmc_retune_disable(host);
1207
1208 if (mmc_host_is_spi(host))
1209 host->ios.chip_select = MMC_CS_HIGH;
1210 else
1211 host->ios.chip_select = MMC_CS_DONTCARE;
1212 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1213 host->ios.bus_width = MMC_BUS_WIDTH_1;
1214 host->ios.timing = MMC_TIMING_LEGACY;
1215 host->ios.drv_type = 0;
1216 host->ios.enhanced_strobe = false;
1217
1218
1219
1220
1221
1222 if ((host->caps2 & MMC_CAP2_HS400_ES) &&
1223 host->ops->hs400_enhanced_strobe)
1224 host->ops->hs400_enhanced_strobe(host, &host->ios);
1225
1226 mmc_set_ios(host);
1227}
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1245{
1246 const int max_bit = ilog2(MMC_VDD_35_36);
1247 int bit;
1248
1249 if (vdd < 1650 || vdd > 3600)
1250 return -EINVAL;
1251
1252 if (vdd >= 1650 && vdd <= 1950)
1253 return ilog2(MMC_VDD_165_195);
1254
1255 if (low_bits)
1256 vdd -= 1;
1257
1258
1259 bit = (vdd - 2000) / 100 + 8;
1260 if (bit > max_bit)
1261 return max_bit;
1262 return bit;
1263}
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1279{
1280 u32 mask = 0;
1281
1282 if (vdd_max < vdd_min)
1283 return 0;
1284
1285
1286 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1287 if (vdd_max < 0)
1288 return 0;
1289
1290
1291 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1292 if (vdd_min < 0)
1293 return 0;
1294
1295
1296 while (vdd_max >= vdd_min)
1297 mask |= 1 << vdd_max--;
1298
1299 return mask;
1300}
1301EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1302
1303#ifdef CONFIG_OF
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
1315{
1316 const u32 *voltage_ranges;
1317 int num_ranges, i;
1318
1319 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
1320 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
1321 if (!voltage_ranges) {
1322 pr_debug("%s: voltage-ranges unspecified\n", np->full_name);
1323 return 0;
1324 }
1325 if (!num_ranges) {
1326 pr_err("%s: voltage-ranges empty\n", np->full_name);
1327 return -EINVAL;
1328 }
1329
1330 for (i = 0; i < num_ranges; i++) {
1331 const int j = i * 2;
1332 u32 ocr_mask;
1333
1334 ocr_mask = mmc_vddrange_to_ocrmask(
1335 be32_to_cpu(voltage_ranges[j]),
1336 be32_to_cpu(voltage_ranges[j + 1]));
1337 if (!ocr_mask) {
1338 pr_err("%s: voltage-range #%d is invalid\n",
1339 np->full_name, i);
1340 return -EINVAL;
1341 }
1342 *mask |= ocr_mask;
1343 }
1344
1345 return 1;
1346}
1347EXPORT_SYMBOL(mmc_of_parse_voltage);
1348
1349#endif
1350
1351static int mmc_of_get_func_num(struct device_node *node)
1352{
1353 u32 reg;
1354 int ret;
1355
1356 ret = of_property_read_u32(node, "reg", ®);
1357 if (ret < 0)
1358 return ret;
1359
1360 return reg;
1361}
1362
1363struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1364 unsigned func_num)
1365{
1366 struct device_node *node;
1367
1368 if (!host->parent || !host->parent->of_node)
1369 return NULL;
1370
1371 for_each_child_of_node(host->parent->of_node, node) {
1372 if (mmc_of_get_func_num(node) == func_num)
1373 return node;
1374 }
1375
1376 return NULL;
1377}
1378
1379#ifdef CONFIG_REGULATOR
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV)
1391{
1392 int tmp;
1393
1394 if (!vdd_bit)
1395 return -EINVAL;
1396
1397
1398
1399
1400
1401
1402
1403 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1404 if (tmp == 0) {
1405 *min_uV = 1650 * 1000;
1406 *max_uV = 1950 * 1000;
1407 } else {
1408 *min_uV = 1900 * 1000 + tmp * 100 * 1000;
1409 *max_uV = *min_uV + 100 * 1000;
1410 }
1411
1412 return 0;
1413}
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424int mmc_regulator_get_ocrmask(struct regulator *supply)
1425{
1426 int result = 0;
1427 int count;
1428 int i;
1429 int vdd_uV;
1430 int vdd_mV;
1431
1432 count = regulator_count_voltages(supply);
1433 if (count < 0)
1434 return count;
1435
1436 for (i = 0; i < count; i++) {
1437 vdd_uV = regulator_list_voltage(supply, i);
1438 if (vdd_uV <= 0)
1439 continue;
1440
1441 vdd_mV = vdd_uV / 1000;
1442 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1443 }
1444
1445 if (!result) {
1446 vdd_uV = regulator_get_voltage(supply);
1447 if (vdd_uV <= 0)
1448 return vdd_uV;
1449
1450 vdd_mV = vdd_uV / 1000;
1451 result = mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1452 }
1453
1454 return result;
1455}
1456EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask);
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470int mmc_regulator_set_ocr(struct mmc_host *mmc,
1471 struct regulator *supply,
1472 unsigned short vdd_bit)
1473{
1474 int result = 0;
1475 int min_uV, max_uV;
1476
1477 if (vdd_bit) {
1478 mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV);
1479
1480 result = regulator_set_voltage(supply, min_uV, max_uV);
1481 if (result == 0 && !mmc->regulator_enabled) {
1482 result = regulator_enable(supply);
1483 if (!result)
1484 mmc->regulator_enabled = true;
1485 }
1486 } else if (mmc->regulator_enabled) {
1487 result = regulator_disable(supply);
1488 if (result == 0)
1489 mmc->regulator_enabled = false;
1490 }
1491
1492 if (result)
1493 dev_err(mmc_dev(mmc),
1494 "could not set regulator OCR (%d)\n", result);
1495 return result;
1496}
1497EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
1498
1499static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator,
1500 int min_uV, int target_uV,
1501 int max_uV)
1502{
1503
1504
1505
1506
1507 if (!regulator_is_supported_voltage(regulator, min_uV, max_uV))
1508 return -EINVAL;
1509
1510 return regulator_set_voltage_triplet(regulator, min_uV, target_uV,
1511 max_uV);
1512}
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios)
1532{
1533 struct device *dev = mmc_dev(mmc);
1534 int ret, volt, min_uV, max_uV;
1535
1536
1537 if (IS_ERR(mmc->supply.vqmmc))
1538 return -EINVAL;
1539
1540 switch (ios->signal_voltage) {
1541 case MMC_SIGNAL_VOLTAGE_120:
1542 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1543 1100000, 1200000, 1300000);
1544 case MMC_SIGNAL_VOLTAGE_180:
1545 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1546 1700000, 1800000, 1950000);
1547 case MMC_SIGNAL_VOLTAGE_330:
1548 ret = mmc_ocrbitnum_to_vdd(mmc->ios.vdd, &volt, &max_uV);
1549 if (ret < 0)
1550 return ret;
1551
1552 dev_dbg(dev, "%s: found vmmc voltage range of %d-%duV\n",
1553 __func__, volt, max_uV);
1554
1555 min_uV = max(volt - 300000, 2700000);
1556 max_uV = min(max_uV + 200000, 3600000);
1557
1558
1559
1560
1561
1562
1563
1564
1565 if (!mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1566 min_uV, volt, max_uV))
1567 return 0;
1568
1569 return mmc_regulator_set_voltage_if_supported(mmc->supply.vqmmc,
1570 2700000, volt, 3600000);
1571 default:
1572 return -EINVAL;
1573 }
1574}
1575EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc);
1576
1577#endif
1578
1579int mmc_regulator_get_supply(struct mmc_host *mmc)
1580{
1581 struct device *dev = mmc_dev(mmc);
1582 int ret;
1583
1584 mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");
1585 mmc->supply.vqmmc = devm_regulator_get_optional(dev, "vqmmc");
1586
1587 if (IS_ERR(mmc->supply.vmmc)) {
1588 if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
1589 return -EPROBE_DEFER;
1590 dev_dbg(dev, "No vmmc regulator found\n");
1591 } else {
1592 ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
1593 if (ret > 0)
1594 mmc->ocr_avail = ret;
1595 else
1596 dev_warn(dev, "Failed getting OCR mask: %d\n", ret);
1597 }
1598
1599 if (IS_ERR(mmc->supply.vqmmc)) {
1600 if (PTR_ERR(mmc->supply.vqmmc) == -EPROBE_DEFER)
1601 return -EPROBE_DEFER;
1602 dev_dbg(dev, "No vqmmc regulator found\n");
1603 }
1604
1605 return 0;
1606}
1607EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
1608
1609
1610
1611
1612
1613u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1614{
1615 int bit;
1616
1617
1618
1619
1620
1621 if (ocr & 0x7F) {
1622 dev_warn(mmc_dev(host),
1623 "card claims to support voltages below defined range\n");
1624 ocr &= ~0x7F;
1625 }
1626
1627 ocr &= host->ocr_avail;
1628 if (!ocr) {
1629 dev_warn(mmc_dev(host), "no support for card's volts\n");
1630 return 0;
1631 }
1632
1633 if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1634 bit = ffs(ocr) - 1;
1635 ocr &= 3 << bit;
1636 mmc_power_cycle(host, ocr);
1637 } else {
1638 bit = fls(ocr) - 1;
1639 ocr &= 3 << bit;
1640 if (bit != host->ios.vdd)
1641 dev_warn(mmc_dev(host), "exceeding card's volts\n");
1642 }
1643
1644 return ocr;
1645}
1646
1647int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1648{
1649 int err = 0;
1650 int old_signal_voltage = host->ios.signal_voltage;
1651
1652 host->ios.signal_voltage = signal_voltage;
1653 if (host->ops->start_signal_voltage_switch)
1654 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1655
1656 if (err)
1657 host->ios.signal_voltage = old_signal_voltage;
1658
1659 return err;
1660
1661}
1662
1663int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, u32 ocr)
1664{
1665 struct mmc_command cmd = {0};
1666 int err = 0;
1667 u32 clock;
1668
1669 BUG_ON(!host);
1670
1671
1672
1673
1674
1675 if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
1676 return __mmc_set_signal_voltage(host, signal_voltage);
1677
1678
1679
1680
1681
1682 if (!host->ops->start_signal_voltage_switch)
1683 return -EPERM;
1684 if (!host->ops->card_busy)
1685 pr_warn("%s: cannot verify signal voltage switch\n",
1686 mmc_hostname(host));
1687
1688 cmd.opcode = SD_SWITCH_VOLTAGE;
1689 cmd.arg = 0;
1690 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1691
1692 err = mmc_wait_for_cmd(host, &cmd, 0);
1693 if (err)
1694 return err;
1695
1696 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1697 return -EIO;
1698
1699
1700
1701
1702
1703 mmc_delay(1);
1704 if (host->ops->card_busy && !host->ops->card_busy(host)) {
1705 err = -EAGAIN;
1706 goto power_cycle;
1707 }
1708
1709
1710
1711
1712 clock = host->ios.clock;
1713 host->ios.clock = 0;
1714 mmc_set_ios(host);
1715
1716 if (__mmc_set_signal_voltage(host, signal_voltage)) {
1717
1718
1719
1720
1721 err = -EAGAIN;
1722 goto power_cycle;
1723 }
1724
1725
1726 mmc_delay(10);
1727 host->ios.clock = clock;
1728 mmc_set_ios(host);
1729
1730
1731 mmc_delay(1);
1732
1733
1734
1735
1736
1737 if (host->ops->card_busy && host->ops->card_busy(host))
1738 err = -EAGAIN;
1739
1740power_cycle:
1741 if (err) {
1742 pr_debug("%s: Signal voltage switch failed, "
1743 "power cycling card\n", mmc_hostname(host));
1744 mmc_power_cycle(host, ocr);
1745 }
1746
1747 return err;
1748}
1749
1750
1751
1752
1753void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1754{
1755 host->ios.timing = timing;
1756 mmc_set_ios(host);
1757}
1758
1759
1760
1761
1762void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1763{
1764 host->ios.drv_type = drv_type;
1765 mmc_set_ios(host);
1766}
1767
1768int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1769 int card_drv_type, int *drv_type)
1770{
1771 struct mmc_host *host = card->host;
1772 int host_drv_type = SD_DRIVER_TYPE_B;
1773
1774 *drv_type = 0;
1775
1776 if (!host->ops->select_drive_strength)
1777 return 0;
1778
1779
1780 if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1781 host_drv_type |= SD_DRIVER_TYPE_A;
1782
1783 if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1784 host_drv_type |= SD_DRIVER_TYPE_C;
1785
1786 if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1787 host_drv_type |= SD_DRIVER_TYPE_D;
1788
1789
1790
1791
1792
1793
1794
1795 return host->ops->select_drive_strength(card, max_dtr,
1796 host_drv_type,
1797 card_drv_type,
1798 drv_type);
1799}
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812void mmc_power_up(struct mmc_host *host, u32 ocr)
1813{
1814 if (host->ios.power_mode == MMC_POWER_ON)
1815 return;
1816
1817 mmc_pwrseq_pre_power_on(host);
1818
1819 host->ios.vdd = fls(ocr) - 1;
1820 host->ios.power_mode = MMC_POWER_UP;
1821
1822 mmc_set_initial_state(host);
1823
1824
1825 if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330) == 0)
1826 dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1827 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180) == 0)
1828 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1829 else if (__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120) == 0)
1830 dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1831
1832
1833
1834
1835
1836 mmc_delay(10);
1837
1838 mmc_pwrseq_post_power_on(host);
1839
1840 host->ios.clock = host->f_init;
1841
1842 host->ios.power_mode = MMC_POWER_ON;
1843 mmc_set_ios(host);
1844
1845
1846
1847
1848
1849 mmc_delay(10);
1850}
1851
1852void mmc_power_off(struct mmc_host *host)
1853{
1854 if (host->ios.power_mode == MMC_POWER_OFF)
1855 return;
1856
1857 mmc_pwrseq_power_off(host);
1858
1859 host->ios.clock = 0;
1860 host->ios.vdd = 0;
1861
1862 host->ios.power_mode = MMC_POWER_OFF;
1863
1864 mmc_set_initial_state(host);
1865
1866
1867
1868
1869
1870
1871 mmc_delay(1);
1872}
1873
1874void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1875{
1876 mmc_power_off(host);
1877
1878 mmc_delay(1);
1879 mmc_power_up(host, ocr);
1880}
1881
1882
1883
1884
1885static void __mmc_release_bus(struct mmc_host *host)
1886{
1887 BUG_ON(!host);
1888 BUG_ON(host->bus_refs);
1889 BUG_ON(!host->bus_dead);
1890
1891 host->bus_ops = NULL;
1892}
1893
1894
1895
1896
1897static inline void mmc_bus_get(struct mmc_host *host)
1898{
1899 unsigned long flags;
1900
1901 spin_lock_irqsave(&host->lock, flags);
1902 host->bus_refs++;
1903 spin_unlock_irqrestore(&host->lock, flags);
1904}
1905
1906
1907
1908
1909
1910static inline void mmc_bus_put(struct mmc_host *host)
1911{
1912 unsigned long flags;
1913
1914 spin_lock_irqsave(&host->lock, flags);
1915 host->bus_refs--;
1916 if ((host->bus_refs == 0) && host->bus_ops)
1917 __mmc_release_bus(host);
1918 spin_unlock_irqrestore(&host->lock, flags);
1919}
1920
1921
1922
1923
1924
1925void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1926{
1927 unsigned long flags;
1928
1929 BUG_ON(!host);
1930 BUG_ON(!ops);
1931
1932 WARN_ON(!host->claimed);
1933
1934 spin_lock_irqsave(&host->lock, flags);
1935
1936 BUG_ON(host->bus_ops);
1937 BUG_ON(host->bus_refs);
1938
1939 host->bus_ops = ops;
1940 host->bus_refs = 1;
1941 host->bus_dead = 0;
1942
1943 spin_unlock_irqrestore(&host->lock, flags);
1944}
1945
1946
1947
1948
1949void mmc_detach_bus(struct mmc_host *host)
1950{
1951 unsigned long flags;
1952
1953 BUG_ON(!host);
1954
1955 WARN_ON(!host->claimed);
1956 WARN_ON(!host->bus_ops);
1957
1958 spin_lock_irqsave(&host->lock, flags);
1959
1960 host->bus_dead = 1;
1961
1962 spin_unlock_irqrestore(&host->lock, flags);
1963
1964 mmc_bus_put(host);
1965}
1966
1967static void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
1968 bool cd_irq)
1969{
1970#ifdef CONFIG_MMC_DEBUG
1971 unsigned long flags;
1972 spin_lock_irqsave(&host->lock, flags);
1973 WARN_ON(host->removed);
1974 spin_unlock_irqrestore(&host->lock, flags);
1975#endif
1976
1977
1978
1979
1980
1981 if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1982 device_can_wakeup(mmc_dev(host)))
1983 pm_wakeup_event(mmc_dev(host), 5000);
1984
1985 host->detect_change = 1;
1986 mmc_schedule_delayed_work(&host->detect, delay);
1987}
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999void mmc_detect_change(struct mmc_host *host, unsigned long delay)
2000{
2001 _mmc_detect_change(host, delay, true);
2002}
2003EXPORT_SYMBOL(mmc_detect_change);
2004
2005void mmc_init_erase(struct mmc_card *card)
2006{
2007 unsigned int sz;
2008
2009 if (is_power_of_2(card->erase_size))
2010 card->erase_shift = ffs(card->erase_size) - 1;
2011 else
2012 card->erase_shift = 0;
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029 if (mmc_card_sd(card) && card->ssr.au) {
2030 card->pref_erase = card->ssr.au;
2031 card->erase_shift = ffs(card->ssr.au) - 1;
2032 } else if (card->erase_size) {
2033 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
2034 if (sz < 128)
2035 card->pref_erase = 512 * 1024 / 512;
2036 else if (sz < 512)
2037 card->pref_erase = 1024 * 1024 / 512;
2038 else if (sz < 1024)
2039 card->pref_erase = 2 * 1024 * 1024 / 512;
2040 else
2041 card->pref_erase = 4 * 1024 * 1024 / 512;
2042 if (card->pref_erase < card->erase_size)
2043 card->pref_erase = card->erase_size;
2044 else {
2045 sz = card->pref_erase % card->erase_size;
2046 if (sz)
2047 card->pref_erase += card->erase_size - sz;
2048 }
2049 } else
2050 card->pref_erase = 0;
2051}
2052
2053static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
2054 unsigned int arg, unsigned int qty)
2055{
2056 unsigned int erase_timeout;
2057
2058 if (arg == MMC_DISCARD_ARG ||
2059 (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
2060 erase_timeout = card->ext_csd.trim_timeout;
2061 } else if (card->ext_csd.erase_group_def & 1) {
2062
2063 if (arg == MMC_TRIM_ARG)
2064 erase_timeout = card->ext_csd.trim_timeout;
2065 else
2066 erase_timeout = card->ext_csd.hc_erase_timeout;
2067 } else {
2068
2069 unsigned int mult = (10 << card->csd.r2w_factor);
2070 unsigned int timeout_clks = card->csd.tacc_clks * mult;
2071 unsigned int timeout_us;
2072
2073
2074 if (card->csd.tacc_ns < 1000000)
2075 timeout_us = (card->csd.tacc_ns * mult) / 1000;
2076 else
2077 timeout_us = (card->csd.tacc_ns / 1000) * mult;
2078
2079
2080
2081
2082
2083 timeout_clks <<= 1;
2084 timeout_us += (timeout_clks * 1000) /
2085 (card->host->ios.clock / 1000);
2086
2087 erase_timeout = timeout_us / 1000;
2088
2089
2090
2091
2092
2093 if (!erase_timeout)
2094 erase_timeout = 1;
2095 }
2096
2097
2098 if (arg & MMC_SECURE_ARGS) {
2099 if (arg == MMC_SECURE_ERASE_ARG)
2100 erase_timeout *= card->ext_csd.sec_erase_mult;
2101 else
2102 erase_timeout *= card->ext_csd.sec_trim_mult;
2103 }
2104
2105 erase_timeout *= qty;
2106
2107
2108
2109
2110
2111 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
2112 erase_timeout = 1000;
2113
2114 return erase_timeout;
2115}
2116
2117static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
2118 unsigned int arg,
2119 unsigned int qty)
2120{
2121 unsigned int erase_timeout;
2122
2123 if (card->ssr.erase_timeout) {
2124
2125 erase_timeout = card->ssr.erase_timeout * qty +
2126 card->ssr.erase_offset;
2127 } else {
2128
2129
2130
2131
2132 erase_timeout = 250 * qty;
2133 }
2134
2135
2136 if (erase_timeout < 1000)
2137 erase_timeout = 1000;
2138
2139 return erase_timeout;
2140}
2141
2142static unsigned int mmc_erase_timeout(struct mmc_card *card,
2143 unsigned int arg,
2144 unsigned int qty)
2145{
2146 if (mmc_card_sd(card))
2147 return mmc_sd_erase_timeout(card, arg, qty);
2148 else
2149 return mmc_mmc_erase_timeout(card, arg, qty);
2150}
2151
2152static int mmc_do_erase(struct mmc_card *card, unsigned int from,
2153 unsigned int to, unsigned int arg)
2154{
2155 struct mmc_command cmd = {0};
2156 unsigned int qty = 0, busy_timeout = 0;
2157 bool use_r1b_resp = false;
2158 unsigned long timeout;
2159 int err;
2160
2161 mmc_retune_hold(card->host);
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179 if (card->erase_shift)
2180 qty += ((to >> card->erase_shift) -
2181 (from >> card->erase_shift)) + 1;
2182 else if (mmc_card_sd(card))
2183 qty += to - from + 1;
2184 else
2185 qty += ((to / card->erase_size) -
2186 (from / card->erase_size)) + 1;
2187
2188 if (!mmc_card_blockaddr(card)) {
2189 from <<= 9;
2190 to <<= 9;
2191 }
2192
2193 if (mmc_card_sd(card))
2194 cmd.opcode = SD_ERASE_WR_BLK_START;
2195 else
2196 cmd.opcode = MMC_ERASE_GROUP_START;
2197 cmd.arg = from;
2198 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2199 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2200 if (err) {
2201 pr_err("mmc_erase: group start error %d, "
2202 "status %#x\n", err, cmd.resp[0]);
2203 err = -EIO;
2204 goto out;
2205 }
2206
2207 memset(&cmd, 0, sizeof(struct mmc_command));
2208 if (mmc_card_sd(card))
2209 cmd.opcode = SD_ERASE_WR_BLK_END;
2210 else
2211 cmd.opcode = MMC_ERASE_GROUP_END;
2212 cmd.arg = to;
2213 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2214 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2215 if (err) {
2216 pr_err("mmc_erase: group end error %d, status %#x\n",
2217 err, cmd.resp[0]);
2218 err = -EIO;
2219 goto out;
2220 }
2221
2222 memset(&cmd, 0, sizeof(struct mmc_command));
2223 cmd.opcode = MMC_ERASE;
2224 cmd.arg = arg;
2225 busy_timeout = mmc_erase_timeout(card, arg, qty);
2226
2227
2228
2229
2230
2231
2232 if (card->host->max_busy_timeout &&
2233 busy_timeout > card->host->max_busy_timeout) {
2234 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2235 } else {
2236 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
2237 cmd.busy_timeout = busy_timeout;
2238 use_r1b_resp = true;
2239 }
2240
2241 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2242 if (err) {
2243 pr_err("mmc_erase: erase error %d, status %#x\n",
2244 err, cmd.resp[0]);
2245 err = -EIO;
2246 goto out;
2247 }
2248
2249 if (mmc_host_is_spi(card->host))
2250 goto out;
2251
2252
2253
2254
2255
2256 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
2257 goto out;
2258
2259 timeout = jiffies + msecs_to_jiffies(busy_timeout);
2260 do {
2261 memset(&cmd, 0, sizeof(struct mmc_command));
2262 cmd.opcode = MMC_SEND_STATUS;
2263 cmd.arg = card->rca << 16;
2264 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
2265
2266 err = mmc_wait_for_cmd(card->host, &cmd, 0);
2267 if (err || (cmd.resp[0] & 0xFDF92000)) {
2268 pr_err("error %d requesting status %#x\n",
2269 err, cmd.resp[0]);
2270 err = -EIO;
2271 goto out;
2272 }
2273
2274
2275
2276
2277 if (time_after(jiffies, timeout)) {
2278 pr_err("%s: Card stuck in programming state! %s\n",
2279 mmc_hostname(card->host), __func__);
2280 err = -EIO;
2281 goto out;
2282 }
2283
2284 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
2285 (R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG));
2286out:
2287 mmc_retune_release(card->host);
2288 return err;
2289}
2290
2291static unsigned int mmc_align_erase_size(struct mmc_card *card,
2292 unsigned int *from,
2293 unsigned int *to,
2294 unsigned int nr)
2295{
2296 unsigned int from_new = *from, nr_new = nr, rem;
2297
2298
2299
2300
2301
2302 if (is_power_of_2(card->erase_size)) {
2303 unsigned int temp = from_new;
2304
2305 from_new = round_up(temp, card->erase_size);
2306 rem = from_new - temp;
2307
2308 if (nr_new > rem)
2309 nr_new -= rem;
2310 else
2311 return 0;
2312
2313 nr_new = round_down(nr_new, card->erase_size);
2314 } else {
2315 rem = from_new % card->erase_size;
2316 if (rem) {
2317 rem = card->erase_size - rem;
2318 from_new += rem;
2319 if (nr_new > rem)
2320 nr_new -= rem;
2321 else
2322 return 0;
2323 }
2324
2325 rem = nr_new % card->erase_size;
2326 if (rem)
2327 nr_new -= rem;
2328 }
2329
2330 if (nr_new == 0)
2331 return 0;
2332
2333 *to = from_new + nr_new;
2334 *from = from_new;
2335
2336 return nr_new;
2337}
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
2349 unsigned int arg)
2350{
2351 unsigned int rem, to = from + nr;
2352 int err;
2353
2354 if (!(card->host->caps & MMC_CAP_ERASE) ||
2355 !(card->csd.cmdclass & CCC_ERASE))
2356 return -EOPNOTSUPP;
2357
2358 if (!card->erase_size)
2359 return -EOPNOTSUPP;
2360
2361 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
2362 return -EOPNOTSUPP;
2363
2364 if ((arg & MMC_SECURE_ARGS) &&
2365 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
2366 return -EOPNOTSUPP;
2367
2368 if ((arg & MMC_TRIM_ARGS) &&
2369 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
2370 return -EOPNOTSUPP;
2371
2372 if (arg == MMC_SECURE_ERASE_ARG) {
2373 if (from % card->erase_size || nr % card->erase_size)
2374 return -EINVAL;
2375 }
2376
2377 if (arg == MMC_ERASE_ARG)
2378 nr = mmc_align_erase_size(card, &from, &to, nr);
2379
2380 if (nr == 0)
2381 return 0;
2382
2383 if (to <= from)
2384 return -EINVAL;
2385
2386
2387 to -= 1;
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397 rem = card->erase_size - (from % card->erase_size);
2398 if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) {
2399 err = mmc_do_erase(card, from, from + rem - 1, arg);
2400 from += rem;
2401 if ((err) || (to <= from))
2402 return err;
2403 }
2404
2405 return mmc_do_erase(card, from, to, arg);
2406}
2407EXPORT_SYMBOL(mmc_erase);
2408
2409int mmc_can_erase(struct mmc_card *card)
2410{
2411 if ((card->host->caps & MMC_CAP_ERASE) &&
2412 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
2413 return 1;
2414 return 0;
2415}
2416EXPORT_SYMBOL(mmc_can_erase);
2417
2418int mmc_can_trim(struct mmc_card *card)
2419{
2420 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
2421 (!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
2422 return 1;
2423 return 0;
2424}
2425EXPORT_SYMBOL(mmc_can_trim);
2426
2427int mmc_can_discard(struct mmc_card *card)
2428{
2429
2430
2431
2432
2433 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
2434 return 1;
2435 return 0;
2436}
2437EXPORT_SYMBOL(mmc_can_discard);
2438
2439int mmc_can_sanitize(struct mmc_card *card)
2440{
2441 if (!mmc_can_trim(card) && !mmc_can_erase(card))
2442 return 0;
2443 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
2444 return 1;
2445 return 0;
2446}
2447EXPORT_SYMBOL(mmc_can_sanitize);
2448
2449int mmc_can_secure_erase_trim(struct mmc_card *card)
2450{
2451 if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
2452 !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
2453 return 1;
2454 return 0;
2455}
2456EXPORT_SYMBOL(mmc_can_secure_erase_trim);
2457
2458int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
2459 unsigned int nr)
2460{
2461 if (!card->erase_size)
2462 return 0;
2463 if (from % card->erase_size || nr % card->erase_size)
2464 return 0;
2465 return 1;
2466}
2467EXPORT_SYMBOL(mmc_erase_group_aligned);
2468
2469static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
2470 unsigned int arg)
2471{
2472 struct mmc_host *host = card->host;
2473 unsigned int max_discard, x, y, qty = 0, max_qty, min_qty, timeout;
2474 unsigned int last_timeout = 0;
2475 unsigned int max_busy_timeout = host->max_busy_timeout ?
2476 host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS;
2477
2478 if (card->erase_shift) {
2479 max_qty = UINT_MAX >> card->erase_shift;
2480 min_qty = card->pref_erase >> card->erase_shift;
2481 } else if (mmc_card_sd(card)) {
2482 max_qty = UINT_MAX;
2483 min_qty = card->pref_erase;
2484 } else {
2485 max_qty = UINT_MAX / card->erase_size;
2486 min_qty = card->pref_erase / card->erase_size;
2487 }
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502 do {
2503 y = 0;
2504 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
2505 timeout = mmc_erase_timeout(card, arg, qty + x);
2506
2507 if (qty + x > min_qty && timeout > max_busy_timeout)
2508 break;
2509
2510 if (timeout < last_timeout)
2511 break;
2512 last_timeout = timeout;
2513 y = x;
2514 }
2515 qty += y;
2516 } while (y);
2517
2518 if (!qty)
2519 return 0;
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531 if (qty == 1)
2532 card->eg_boundary = 1;
2533 else
2534 qty--;
2535
2536
2537 if (card->erase_shift)
2538 max_discard = qty << card->erase_shift;
2539 else if (mmc_card_sd(card))
2540 max_discard = qty + 1;
2541 else
2542 max_discard = qty * card->erase_size;
2543
2544 return max_discard;
2545}
2546
2547unsigned int mmc_calc_max_discard(struct mmc_card *card)
2548{
2549 struct mmc_host *host = card->host;
2550 unsigned int max_discard, max_trim;
2551
2552
2553
2554
2555
2556
2557 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2558 return card->pref_erase;
2559
2560 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2561 if (mmc_can_trim(card)) {
2562 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2563 if (max_trim < max_discard)
2564 max_discard = max_trim;
2565 } else if (max_discard < card->erase_size) {
2566 max_discard = 0;
2567 }
2568 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2569 mmc_hostname(host), max_discard, host->max_busy_timeout ?
2570 host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS);
2571 return max_discard;
2572}
2573EXPORT_SYMBOL(mmc_calc_max_discard);
2574
2575int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2576{
2577 struct mmc_command cmd = {0};
2578
2579 if (mmc_card_blockaddr(card) || mmc_card_ddr52(card) ||
2580 mmc_card_hs400(card) || mmc_card_hs400es(card))
2581 return 0;
2582
2583 cmd.opcode = MMC_SET_BLOCKLEN;
2584 cmd.arg = blocklen;
2585 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2586 return mmc_wait_for_cmd(card->host, &cmd, 5);
2587}
2588EXPORT_SYMBOL(mmc_set_blocklen);
2589
2590int mmc_set_blockcount(struct mmc_card *card, unsigned int blockcount,
2591 bool is_rel_write)
2592{
2593 struct mmc_command cmd = {0};
2594
2595 cmd.opcode = MMC_SET_BLOCK_COUNT;
2596 cmd.arg = blockcount & 0x0000FFFF;
2597 if (is_rel_write)
2598 cmd.arg |= 1 << 31;
2599 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2600 return mmc_wait_for_cmd(card->host, &cmd, 5);
2601}
2602EXPORT_SYMBOL(mmc_set_blockcount);
2603
2604static void mmc_hw_reset_for_init(struct mmc_host *host)
2605{
2606 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2607 return;
2608 host->ops->hw_reset(host);
2609}
2610
2611int mmc_hw_reset(struct mmc_host *host)
2612{
2613 int ret;
2614
2615 if (!host->card)
2616 return -EINVAL;
2617
2618 mmc_bus_get(host);
2619 if (!host->bus_ops || host->bus_dead || !host->bus_ops->reset) {
2620 mmc_bus_put(host);
2621 return -EOPNOTSUPP;
2622 }
2623
2624 ret = host->bus_ops->reset(host);
2625 mmc_bus_put(host);
2626
2627 if (ret)
2628 pr_warn("%s: tried to reset card, got error %d\n",
2629 mmc_hostname(host), ret);
2630
2631 return ret;
2632}
2633EXPORT_SYMBOL(mmc_hw_reset);
2634
2635static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2636{
2637 host->f_init = freq;
2638
2639#ifdef CONFIG_MMC_DEBUG
2640 pr_info("%s: %s: trying to init card at %u Hz\n",
2641 mmc_hostname(host), __func__, host->f_init);
2642#endif
2643 mmc_power_up(host, host->ocr_avail);
2644
2645
2646
2647
2648
2649 mmc_hw_reset_for_init(host);
2650
2651
2652
2653
2654
2655
2656
2657 if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2658 sdio_reset(host);
2659
2660 mmc_go_idle(host);
2661
2662 if (!(host->caps2 & MMC_CAP2_NO_SD))
2663 mmc_send_if_cond(host, host->ocr_avail);
2664
2665
2666 if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2667 if (!mmc_attach_sdio(host))
2668 return 0;
2669
2670 if (!(host->caps2 & MMC_CAP2_NO_SD))
2671 if (!mmc_attach_sd(host))
2672 return 0;
2673
2674 if (!(host->caps2 & MMC_CAP2_NO_MMC))
2675 if (!mmc_attach_mmc(host))
2676 return 0;
2677
2678 mmc_power_off(host);
2679 return -EIO;
2680}
2681
2682int _mmc_detect_card_removed(struct mmc_host *host)
2683{
2684 int ret;
2685
2686 if (!host->card || mmc_card_removed(host->card))
2687 return 1;
2688
2689 ret = host->bus_ops->alive(host);
2690
2691
2692
2693
2694
2695
2696
2697
2698 if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2699 mmc_detect_change(host, msecs_to_jiffies(200));
2700 pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2701 }
2702
2703 if (ret) {
2704 mmc_card_set_removed(host->card);
2705 pr_debug("%s: card remove detected\n", mmc_hostname(host));
2706 }
2707
2708 return ret;
2709}
2710
2711int mmc_detect_card_removed(struct mmc_host *host)
2712{
2713 struct mmc_card *card = host->card;
2714 int ret;
2715
2716 WARN_ON(!host->claimed);
2717
2718 if (!card)
2719 return 1;
2720
2721 if (!mmc_card_is_removable(host))
2722 return 0;
2723
2724 ret = mmc_card_removed(card);
2725
2726
2727
2728
2729 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2730 return ret;
2731
2732 host->detect_change = 0;
2733 if (!ret) {
2734 ret = _mmc_detect_card_removed(host);
2735 if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2736
2737
2738
2739
2740 cancel_delayed_work(&host->detect);
2741 _mmc_detect_change(host, 0, false);
2742 }
2743 }
2744
2745 return ret;
2746}
2747EXPORT_SYMBOL(mmc_detect_card_removed);
2748
2749void mmc_rescan(struct work_struct *work)
2750{
2751 struct mmc_host *host =
2752 container_of(work, struct mmc_host, detect.work);
2753 int i;
2754
2755 if (host->rescan_disable)
2756 return;
2757
2758
2759 if (!mmc_card_is_removable(host) && host->rescan_entered)
2760 return;
2761 host->rescan_entered = 1;
2762
2763 if (host->trigger_card_event && host->ops->card_event) {
2764 mmc_claim_host(host);
2765 host->ops->card_event(host);
2766 mmc_release_host(host);
2767 host->trigger_card_event = false;
2768 }
2769
2770 mmc_bus_get(host);
2771
2772
2773
2774
2775
2776 if (host->bus_ops && !host->bus_dead && mmc_card_is_removable(host))
2777 host->bus_ops->detect(host);
2778
2779 host->detect_change = 0;
2780
2781
2782
2783
2784
2785 mmc_bus_put(host);
2786 mmc_bus_get(host);
2787
2788
2789 if (host->bus_ops != NULL) {
2790 mmc_bus_put(host);
2791 goto out;
2792 }
2793
2794
2795
2796
2797
2798 mmc_bus_put(host);
2799
2800 mmc_claim_host(host);
2801 if (mmc_card_is_removable(host) && host->ops->get_cd &&
2802 host->ops->get_cd(host) == 0) {
2803 mmc_power_off(host);
2804 mmc_release_host(host);
2805 goto out;
2806 }
2807
2808 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2809 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
2810 break;
2811 if (freqs[i] <= host->f_min)
2812 break;
2813 }
2814 mmc_release_host(host);
2815
2816 out:
2817 if (host->caps & MMC_CAP_NEEDS_POLL)
2818 mmc_schedule_delayed_work(&host->detect, HZ);
2819}
2820
2821void mmc_start_host(struct mmc_host *host)
2822{
2823 host->f_init = max(freqs[0], host->f_min);
2824 host->rescan_disable = 0;
2825 host->ios.power_mode = MMC_POWER_UNDEFINED;
2826
2827 mmc_claim_host(host);
2828 if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
2829 mmc_power_off(host);
2830 else
2831 mmc_power_up(host, host->ocr_avail);
2832 mmc_release_host(host);
2833
2834 mmc_gpiod_request_cd_irq(host);
2835 _mmc_detect_change(host, 0, false);
2836}
2837
2838void mmc_stop_host(struct mmc_host *host)
2839{
2840#ifdef CONFIG_MMC_DEBUG
2841 unsigned long flags;
2842 spin_lock_irqsave(&host->lock, flags);
2843 host->removed = 1;
2844 spin_unlock_irqrestore(&host->lock, flags);
2845#endif
2846 if (host->slot.cd_irq >= 0)
2847 disable_irq(host->slot.cd_irq);
2848
2849 host->rescan_disable = 1;
2850 cancel_delayed_work_sync(&host->detect);
2851
2852
2853 host->pm_flags = 0;
2854
2855 mmc_bus_get(host);
2856 if (host->bus_ops && !host->bus_dead) {
2857
2858 host->bus_ops->remove(host);
2859 mmc_claim_host(host);
2860 mmc_detach_bus(host);
2861 mmc_power_off(host);
2862 mmc_release_host(host);
2863 mmc_bus_put(host);
2864 return;
2865 }
2866 mmc_bus_put(host);
2867
2868 BUG_ON(host->card);
2869
2870 mmc_claim_host(host);
2871 mmc_power_off(host);
2872 mmc_release_host(host);
2873}
2874
2875int mmc_power_save_host(struct mmc_host *host)
2876{
2877 int ret = 0;
2878
2879#ifdef CONFIG_MMC_DEBUG
2880 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2881#endif
2882
2883 mmc_bus_get(host);
2884
2885 if (!host->bus_ops || host->bus_dead) {
2886 mmc_bus_put(host);
2887 return -EINVAL;
2888 }
2889
2890 if (host->bus_ops->power_save)
2891 ret = host->bus_ops->power_save(host);
2892
2893 mmc_bus_put(host);
2894
2895 mmc_power_off(host);
2896
2897 return ret;
2898}
2899EXPORT_SYMBOL(mmc_power_save_host);
2900
2901int mmc_power_restore_host(struct mmc_host *host)
2902{
2903 int ret;
2904
2905#ifdef CONFIG_MMC_DEBUG
2906 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2907#endif
2908
2909 mmc_bus_get(host);
2910
2911 if (!host->bus_ops || host->bus_dead) {
2912 mmc_bus_put(host);
2913 return -EINVAL;
2914 }
2915
2916 mmc_power_up(host, host->card->ocr);
2917 ret = host->bus_ops->power_restore(host);
2918
2919 mmc_bus_put(host);
2920
2921 return ret;
2922}
2923EXPORT_SYMBOL(mmc_power_restore_host);
2924
2925
2926
2927
2928int mmc_flush_cache(struct mmc_card *card)
2929{
2930 int err = 0;
2931
2932 if (mmc_card_mmc(card) &&
2933 (card->ext_csd.cache_size > 0) &&
2934 (card->ext_csd.cache_ctrl & 1)) {
2935 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2936 EXT_CSD_FLUSH_CACHE, 1, 0);
2937 if (err)
2938 pr_err("%s: cache flush error %d\n",
2939 mmc_hostname(card->host), err);
2940 }
2941
2942 return err;
2943}
2944EXPORT_SYMBOL(mmc_flush_cache);
2945
2946#ifdef CONFIG_PM_SLEEP
2947
2948
2949
2950
2951static int mmc_pm_notify(struct notifier_block *notify_block,
2952 unsigned long mode, void *unused)
2953{
2954 struct mmc_host *host = container_of(
2955 notify_block, struct mmc_host, pm_notify);
2956 unsigned long flags;
2957 int err = 0;
2958
2959 switch (mode) {
2960 case PM_HIBERNATION_PREPARE:
2961 case PM_SUSPEND_PREPARE:
2962 case PM_RESTORE_PREPARE:
2963 spin_lock_irqsave(&host->lock, flags);
2964 host->rescan_disable = 1;
2965 spin_unlock_irqrestore(&host->lock, flags);
2966 cancel_delayed_work_sync(&host->detect);
2967
2968 if (!host->bus_ops)
2969 break;
2970
2971
2972 if (host->bus_ops->pre_suspend)
2973 err = host->bus_ops->pre_suspend(host);
2974 if (!err)
2975 break;
2976
2977
2978 host->bus_ops->remove(host);
2979 mmc_claim_host(host);
2980 mmc_detach_bus(host);
2981 mmc_power_off(host);
2982 mmc_release_host(host);
2983 host->pm_flags = 0;
2984 break;
2985
2986 case PM_POST_SUSPEND:
2987 case PM_POST_HIBERNATION:
2988 case PM_POST_RESTORE:
2989
2990 spin_lock_irqsave(&host->lock, flags);
2991 host->rescan_disable = 0;
2992 spin_unlock_irqrestore(&host->lock, flags);
2993 _mmc_detect_change(host, 0, false);
2994
2995 }
2996
2997 return 0;
2998}
2999
3000void mmc_register_pm_notifier(struct mmc_host *host)
3001{
3002 host->pm_notify.notifier_call = mmc_pm_notify;
3003 register_pm_notifier(&host->pm_notify);
3004}
3005
3006void mmc_unregister_pm_notifier(struct mmc_host *host)
3007{
3008 unregister_pm_notifier(&host->pm_notify);
3009}
3010#endif
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020void mmc_init_context_info(struct mmc_host *host)
3021{
3022 spin_lock_init(&host->context_info.lock);
3023 host->context_info.is_new_req = false;
3024 host->context_info.is_done_rcv = false;
3025 host->context_info.is_waiting_last_req = false;
3026 init_waitqueue_head(&host->context_info.wait);
3027}
3028
3029static int __init mmc_init(void)
3030{
3031 int ret;
3032
3033 ret = mmc_register_bus();
3034 if (ret)
3035 return ret;
3036
3037 ret = mmc_register_host_class();
3038 if (ret)
3039 goto unregister_bus;
3040
3041 ret = sdio_register_bus();
3042 if (ret)
3043 goto unregister_host_class;
3044
3045 return 0;
3046
3047unregister_host_class:
3048 mmc_unregister_host_class();
3049unregister_bus:
3050 mmc_unregister_bus();
3051 return ret;
3052}
3053
3054static void __exit mmc_exit(void)
3055{
3056 sdio_unregister_bus();
3057 mmc_unregister_host_class();
3058 mmc_unregister_bus();
3059}
3060
3061subsys_initcall(mmc_init);
3062module_exit(mmc_exit);
3063
3064MODULE_LICENSE("GPL");
3065