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1/*
2 * linux/drivers/mmc/core/mmc_ops.h
3 *
4 * Copyright 2006-2007 Pierre Ossman
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 as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/slab.h>
13#include <linux/export.h>
14#include <linux/types.h>
15#include <linux/scatterlist.h>
16
17#include <linux/mmc/host.h>
18#include <linux/mmc/card.h>
19#include <linux/mmc/mmc.h>
20
21#include "core.h"
22#include "host.h"
23#include "mmc_ops.h"
24
25#define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
26
27static const u8 tuning_blk_pattern_4bit[] = {
28 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
29 0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
30 0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
31 0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
32 0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
33 0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
34 0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
35 0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
36};
37
38static const u8 tuning_blk_pattern_8bit[] = {
39 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
40 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
41 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
42 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
43 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
44 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
45 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
46 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
47 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
48 0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
49 0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
50 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
51 0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
52 0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
53 0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
54 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
55};
56
57static inline int __mmc_send_status(struct mmc_card *card, u32 *status,
58 bool ignore_crc)
59{
60 int err;
61 struct mmc_command cmd = {0};
62
63 BUG_ON(!card);
64 BUG_ON(!card->host);
65
66 cmd.opcode = MMC_SEND_STATUS;
67 if (!mmc_host_is_spi(card->host))
68 cmd.arg = card->rca << 16;
69 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
70 if (ignore_crc)
71 cmd.flags &= ~MMC_RSP_CRC;
72
73 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
74 if (err)
75 return err;
76
77 /* NOTE: callers are required to understand the difference
78 * between "native" and SPI format status words!
79 */
80 if (status)
81 *status = cmd.resp[0];
82
83 return 0;
84}
85
86int mmc_send_status(struct mmc_card *card, u32 *status)
87{
88 return __mmc_send_status(card, status, false);
89}
90
91static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
92{
93 struct mmc_command cmd = {0};
94
95 BUG_ON(!host);
96
97 cmd.opcode = MMC_SELECT_CARD;
98
99 if (card) {
100 cmd.arg = card->rca << 16;
101 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
102 } else {
103 cmd.arg = 0;
104 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
105 }
106
107 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
108}
109
110int mmc_select_card(struct mmc_card *card)
111{
112 BUG_ON(!card);
113
114 return _mmc_select_card(card->host, card);
115}
116
117int mmc_deselect_cards(struct mmc_host *host)
118{
119 return _mmc_select_card(host, NULL);
120}
121
122/*
123 * Write the value specified in the device tree or board code into the optional
124 * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
125 * drive strength of the DAT and CMD outputs. The actual meaning of a given
126 * value is hardware dependant.
127 * The presence of the DSR register can be determined from the CSD register,
128 * bit 76.
129 */
130int mmc_set_dsr(struct mmc_host *host)
131{
132 struct mmc_command cmd = {0};
133
134 cmd.opcode = MMC_SET_DSR;
135
136 cmd.arg = (host->dsr << 16) | 0xffff;
137 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
138
139 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
140}
141
142int mmc_go_idle(struct mmc_host *host)
143{
144 int err;
145 struct mmc_command cmd = {0};
146
147 /*
148 * Non-SPI hosts need to prevent chipselect going active during
149 * GO_IDLE; that would put chips into SPI mode. Remind them of
150 * that in case of hardware that won't pull up DAT3/nCS otherwise.
151 *
152 * SPI hosts ignore ios.chip_select; it's managed according to
153 * rules that must accommodate non-MMC slaves which this layer
154 * won't even know about.
155 */
156 if (!mmc_host_is_spi(host)) {
157 mmc_set_chip_select(host, MMC_CS_HIGH);
158 mmc_delay(1);
159 }
160
161 cmd.opcode = MMC_GO_IDLE_STATE;
162 cmd.arg = 0;
163 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
164
165 err = mmc_wait_for_cmd(host, &cmd, 0);
166
167 mmc_delay(1);
168
169 if (!mmc_host_is_spi(host)) {
170 mmc_set_chip_select(host, MMC_CS_DONTCARE);
171 mmc_delay(1);
172 }
173
174 host->use_spi_crc = 0;
175
176 return err;
177}
178
179int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
180{
181 struct mmc_command cmd = {0};
182 int i, err = 0;
183
184 BUG_ON(!host);
185
186 cmd.opcode = MMC_SEND_OP_COND;
187 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
188 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
189
190 for (i = 100; i; i--) {
191 err = mmc_wait_for_cmd(host, &cmd, 0);
192 if (err)
193 break;
194
195 /* if we're just probing, do a single pass */
196 if (ocr == 0)
197 break;
198
199 /* otherwise wait until reset completes */
200 if (mmc_host_is_spi(host)) {
201 if (!(cmd.resp[0] & R1_SPI_IDLE))
202 break;
203 } else {
204 if (cmd.resp[0] & MMC_CARD_BUSY)
205 break;
206 }
207
208 err = -ETIMEDOUT;
209
210 mmc_delay(10);
211 }
212
213 if (rocr && !mmc_host_is_spi(host))
214 *rocr = cmd.resp[0];
215
216 return err;
217}
218
219int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
220{
221 int err;
222 struct mmc_command cmd = {0};
223
224 BUG_ON(!host);
225 BUG_ON(!cid);
226
227 cmd.opcode = MMC_ALL_SEND_CID;
228 cmd.arg = 0;
229 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
230
231 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
232 if (err)
233 return err;
234
235 memcpy(cid, cmd.resp, sizeof(u32) * 4);
236
237 return 0;
238}
239
240int mmc_set_relative_addr(struct mmc_card *card)
241{
242 struct mmc_command cmd = {0};
243
244 BUG_ON(!card);
245 BUG_ON(!card->host);
246
247 cmd.opcode = MMC_SET_RELATIVE_ADDR;
248 cmd.arg = card->rca << 16;
249 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
250
251 return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
252}
253
254static int
255mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
256{
257 int err;
258 struct mmc_command cmd = {0};
259
260 BUG_ON(!host);
261 BUG_ON(!cxd);
262
263 cmd.opcode = opcode;
264 cmd.arg = arg;
265 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
266
267 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
268 if (err)
269 return err;
270
271 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
272
273 return 0;
274}
275
276/*
277 * NOTE: void *buf, caller for the buf is required to use DMA-capable
278 * buffer or on-stack buffer (with some overhead in callee).
279 */
280static int
281mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
282 u32 opcode, void *buf, unsigned len)
283{
284 struct mmc_request mrq = {NULL};
285 struct mmc_command cmd = {0};
286 struct mmc_data data = {0};
287 struct scatterlist sg;
288
289 mrq.cmd = &cmd;
290 mrq.data = &data;
291
292 cmd.opcode = opcode;
293 cmd.arg = 0;
294
295 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
296 * rely on callers to never use this with "native" calls for reading
297 * CSD or CID. Native versions of those commands use the R2 type,
298 * not R1 plus a data block.
299 */
300 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
301
302 data.blksz = len;
303 data.blocks = 1;
304 data.flags = MMC_DATA_READ;
305 data.sg = &sg;
306 data.sg_len = 1;
307
308 sg_init_one(&sg, buf, len);
309
310 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
311 /*
312 * The spec states that CSR and CID accesses have a timeout
313 * of 64 clock cycles.
314 */
315 data.timeout_ns = 0;
316 data.timeout_clks = 64;
317 } else
318 mmc_set_data_timeout(&data, card);
319
320 mmc_wait_for_req(host, &mrq);
321
322 if (cmd.error)
323 return cmd.error;
324 if (data.error)
325 return data.error;
326
327 return 0;
328}
329
330int mmc_send_csd(struct mmc_card *card, u32 *csd)
331{
332 int ret, i;
333 u32 *csd_tmp;
334
335 if (!mmc_host_is_spi(card->host))
336 return mmc_send_cxd_native(card->host, card->rca << 16,
337 csd, MMC_SEND_CSD);
338
339 csd_tmp = kzalloc(16, GFP_KERNEL);
340 if (!csd_tmp)
341 return -ENOMEM;
342
343 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
344 if (ret)
345 goto err;
346
347 for (i = 0;i < 4;i++)
348 csd[i] = be32_to_cpu(csd_tmp[i]);
349
350err:
351 kfree(csd_tmp);
352 return ret;
353}
354
355int mmc_send_cid(struct mmc_host *host, u32 *cid)
356{
357 int ret, i;
358 u32 *cid_tmp;
359
360 if (!mmc_host_is_spi(host)) {
361 if (!host->card)
362 return -EINVAL;
363 return mmc_send_cxd_native(host, host->card->rca << 16,
364 cid, MMC_SEND_CID);
365 }
366
367 cid_tmp = kzalloc(16, GFP_KERNEL);
368 if (!cid_tmp)
369 return -ENOMEM;
370
371 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
372 if (ret)
373 goto err;
374
375 for (i = 0;i < 4;i++)
376 cid[i] = be32_to_cpu(cid_tmp[i]);
377
378err:
379 kfree(cid_tmp);
380 return ret;
381}
382
383int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
384{
385 int err;
386 u8 *ext_csd;
387
388 if (!card || !new_ext_csd)
389 return -EINVAL;
390
391 if (!mmc_can_ext_csd(card))
392 return -EOPNOTSUPP;
393
394 /*
395 * As the ext_csd is so large and mostly unused, we don't store the
396 * raw block in mmc_card.
397 */
398 ext_csd = kzalloc(512, GFP_KERNEL);
399 if (!ext_csd)
400 return -ENOMEM;
401
402 err = mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd,
403 512);
404 if (err)
405 kfree(ext_csd);
406 else
407 *new_ext_csd = ext_csd;
408
409 return err;
410}
411EXPORT_SYMBOL_GPL(mmc_get_ext_csd);
412
413int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
414{
415 struct mmc_command cmd = {0};
416 int err;
417
418 cmd.opcode = MMC_SPI_READ_OCR;
419 cmd.arg = highcap ? (1 << 30) : 0;
420 cmd.flags = MMC_RSP_SPI_R3;
421
422 err = mmc_wait_for_cmd(host, &cmd, 0);
423
424 *ocrp = cmd.resp[1];
425 return err;
426}
427
428int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
429{
430 struct mmc_command cmd = {0};
431 int err;
432
433 cmd.opcode = MMC_SPI_CRC_ON_OFF;
434 cmd.flags = MMC_RSP_SPI_R1;
435 cmd.arg = use_crc;
436
437 err = mmc_wait_for_cmd(host, &cmd, 0);
438 if (!err)
439 host->use_spi_crc = use_crc;
440 return err;
441}
442
443int mmc_switch_status_error(struct mmc_host *host, u32 status)
444{
445 if (mmc_host_is_spi(host)) {
446 if (status & R1_SPI_ILLEGAL_COMMAND)
447 return -EBADMSG;
448 } else {
449 if (status & 0xFDFFA000)
450 pr_warn("%s: unexpected status %#x after switch\n",
451 mmc_hostname(host), status);
452 if (status & R1_SWITCH_ERROR)
453 return -EBADMSG;
454 }
455 return 0;
456}
457
458/**
459 * __mmc_switch - modify EXT_CSD register
460 * @card: the MMC card associated with the data transfer
461 * @set: cmd set values
462 * @index: EXT_CSD register index
463 * @value: value to program into EXT_CSD register
464 * @timeout_ms: timeout (ms) for operation performed by register write,
465 * timeout of zero implies maximum possible timeout
466 * @use_busy_signal: use the busy signal as response type
467 * @send_status: send status cmd to poll for busy
468 * @ignore_crc: ignore CRC errors when sending status cmd to poll for busy
469 *
470 * Modifies the EXT_CSD register for selected card.
471 */
472int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
473 unsigned int timeout_ms, bool use_busy_signal, bool send_status,
474 bool ignore_crc)
475{
476 struct mmc_host *host = card->host;
477 int err;
478 struct mmc_command cmd = {0};
479 unsigned long timeout;
480 u32 status = 0;
481 bool use_r1b_resp = use_busy_signal;
482 bool expired = false;
483
484 mmc_retune_hold(host);
485
486 /*
487 * If the cmd timeout and the max_busy_timeout of the host are both
488 * specified, let's validate them. A failure means we need to prevent
489 * the host from doing hw busy detection, which is done by converting
490 * to a R1 response instead of a R1B.
491 */
492 if (timeout_ms && host->max_busy_timeout &&
493 (timeout_ms > host->max_busy_timeout))
494 use_r1b_resp = false;
495
496 cmd.opcode = MMC_SWITCH;
497 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
498 (index << 16) |
499 (value << 8) |
500 set;
501 cmd.flags = MMC_CMD_AC;
502 if (use_r1b_resp) {
503 cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
504 /*
505 * A busy_timeout of zero means the host can decide to use
506 * whatever value it finds suitable.
507 */
508 cmd.busy_timeout = timeout_ms;
509 } else {
510 cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
511 }
512
513 if (index == EXT_CSD_SANITIZE_START)
514 cmd.sanitize_busy = true;
515
516 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
517 if (err)
518 goto out;
519
520 /* No need to check card status in case of unblocking command */
521 if (!use_busy_signal)
522 goto out;
523
524 /*
525 * CRC errors shall only be ignored in cases were CMD13 is used to poll
526 * to detect busy completion.
527 */
528 if ((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
529 ignore_crc = false;
530
531 /* We have an unspecified cmd timeout, use the fallback value. */
532 if (!timeout_ms)
533 timeout_ms = MMC_OPS_TIMEOUT_MS;
534
535 /* Must check status to be sure of no errors. */
536 timeout = jiffies + msecs_to_jiffies(timeout_ms);
537 do {
538 if (send_status) {
539 /*
540 * Due to the possibility of being preempted after
541 * sending the status command, check the expiration
542 * time first.
543 */
544 expired = time_after(jiffies, timeout);
545 err = __mmc_send_status(card, &status, ignore_crc);
546 if (err)
547 goto out;
548 }
549 if ((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
550 break;
551 if (mmc_host_is_spi(host))
552 break;
553
554 /*
555 * We are not allowed to issue a status command and the host
556 * does'nt support MMC_CAP_WAIT_WHILE_BUSY, then we can only
557 * rely on waiting for the stated timeout to be sufficient.
558 */
559 if (!send_status) {
560 mmc_delay(timeout_ms);
561 goto out;
562 }
563
564 /* Timeout if the device never leaves the program state. */
565 if (expired && R1_CURRENT_STATE(status) == R1_STATE_PRG) {
566 pr_err("%s: Card stuck in programming state! %s\n",
567 mmc_hostname(host), __func__);
568 err = -ETIMEDOUT;
569 goto out;
570 }
571 } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
572
573 err = mmc_switch_status_error(host, status);
574out:
575 mmc_retune_release(host);
576
577 return err;
578}
579
580int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
581 unsigned int timeout_ms)
582{
583 return __mmc_switch(card, set, index, value, timeout_ms, true, true,
584 false);
585}
586EXPORT_SYMBOL_GPL(mmc_switch);
587
588int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
589{
590 struct mmc_request mrq = {NULL};
591 struct mmc_command cmd = {0};
592 struct mmc_data data = {0};
593 struct scatterlist sg;
594 struct mmc_ios *ios = &host->ios;
595 const u8 *tuning_block_pattern;
596 int size, err = 0;
597 u8 *data_buf;
598
599 if (ios->bus_width == MMC_BUS_WIDTH_8) {
600 tuning_block_pattern = tuning_blk_pattern_8bit;
601 size = sizeof(tuning_blk_pattern_8bit);
602 } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
603 tuning_block_pattern = tuning_blk_pattern_4bit;
604 size = sizeof(tuning_blk_pattern_4bit);
605 } else
606 return -EINVAL;
607
608 data_buf = kzalloc(size, GFP_KERNEL);
609 if (!data_buf)
610 return -ENOMEM;
611
612 mrq.cmd = &cmd;
613 mrq.data = &data;
614
615 cmd.opcode = opcode;
616 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
617
618 data.blksz = size;
619 data.blocks = 1;
620 data.flags = MMC_DATA_READ;
621
622 /*
623 * According to the tuning specs, Tuning process
624 * is normally shorter 40 executions of CMD19,
625 * and timeout value should be shorter than 150 ms
626 */
627 data.timeout_ns = 150 * NSEC_PER_MSEC;
628
629 data.sg = &sg;
630 data.sg_len = 1;
631 sg_init_one(&sg, data_buf, size);
632
633 mmc_wait_for_req(host, &mrq);
634
635 if (cmd_error)
636 *cmd_error = cmd.error;
637
638 if (cmd.error) {
639 err = cmd.error;
640 goto out;
641 }
642
643 if (data.error) {
644 err = data.error;
645 goto out;
646 }
647
648 if (memcmp(data_buf, tuning_block_pattern, size))
649 err = -EIO;
650
651out:
652 kfree(data_buf);
653 return err;
654}
655EXPORT_SYMBOL_GPL(mmc_send_tuning);
656
657static int
658mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
659 u8 len)
660{
661 struct mmc_request mrq = {NULL};
662 struct mmc_command cmd = {0};
663 struct mmc_data data = {0};
664 struct scatterlist sg;
665 u8 *data_buf;
666 u8 *test_buf;
667 int i, err;
668 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
669 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
670
671 /* dma onto stack is unsafe/nonportable, but callers to this
672 * routine normally provide temporary on-stack buffers ...
673 */
674 data_buf = kmalloc(len, GFP_KERNEL);
675 if (!data_buf)
676 return -ENOMEM;
677
678 if (len == 8)
679 test_buf = testdata_8bit;
680 else if (len == 4)
681 test_buf = testdata_4bit;
682 else {
683 pr_err("%s: Invalid bus_width %d\n",
684 mmc_hostname(host), len);
685 kfree(data_buf);
686 return -EINVAL;
687 }
688
689 if (opcode == MMC_BUS_TEST_W)
690 memcpy(data_buf, test_buf, len);
691
692 mrq.cmd = &cmd;
693 mrq.data = &data;
694 cmd.opcode = opcode;
695 cmd.arg = 0;
696
697 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
698 * rely on callers to never use this with "native" calls for reading
699 * CSD or CID. Native versions of those commands use the R2 type,
700 * not R1 plus a data block.
701 */
702 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
703
704 data.blksz = len;
705 data.blocks = 1;
706 if (opcode == MMC_BUS_TEST_R)
707 data.flags = MMC_DATA_READ;
708 else
709 data.flags = MMC_DATA_WRITE;
710
711 data.sg = &sg;
712 data.sg_len = 1;
713 mmc_set_data_timeout(&data, card);
714 sg_init_one(&sg, data_buf, len);
715 mmc_wait_for_req(host, &mrq);
716 err = 0;
717 if (opcode == MMC_BUS_TEST_R) {
718 for (i = 0; i < len / 4; i++)
719 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
720 err = -EIO;
721 break;
722 }
723 }
724 kfree(data_buf);
725
726 if (cmd.error)
727 return cmd.error;
728 if (data.error)
729 return data.error;
730
731 return err;
732}
733
734int mmc_bus_test(struct mmc_card *card, u8 bus_width)
735{
736 int width;
737
738 if (bus_width == MMC_BUS_WIDTH_8)
739 width = 8;
740 else if (bus_width == MMC_BUS_WIDTH_4)
741 width = 4;
742 else if (bus_width == MMC_BUS_WIDTH_1)
743 return 0; /* no need for test */
744 else
745 return -EINVAL;
746
747 /*
748 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
749 * is a problem. This improves chances that the test will work.
750 */
751 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
752 return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
753}
754
755int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
756{
757 struct mmc_command cmd = {0};
758 unsigned int opcode;
759 int err;
760
761 if (!card->ext_csd.hpi) {
762 pr_warn("%s: Card didn't support HPI command\n",
763 mmc_hostname(card->host));
764 return -EINVAL;
765 }
766
767 opcode = card->ext_csd.hpi_cmd;
768 if (opcode == MMC_STOP_TRANSMISSION)
769 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
770 else if (opcode == MMC_SEND_STATUS)
771 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
772
773 cmd.opcode = opcode;
774 cmd.arg = card->rca << 16 | 1;
775
776 err = mmc_wait_for_cmd(card->host, &cmd, 0);
777 if (err) {
778 pr_warn("%s: error %d interrupting operation. "
779 "HPI command response %#x\n", mmc_hostname(card->host),
780 err, cmd.resp[0]);
781 return err;
782 }
783 if (status)
784 *status = cmd.resp[0];
785
786 return 0;
787}
788
789int mmc_can_ext_csd(struct mmc_card *card)
790{
791 return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
792}
1/*
2 * linux/drivers/mmc/core/mmc_ops.h
3 *
4 * Copyright 2006-2007 Pierre Ossman
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 as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/slab.h>
13#include <linux/export.h>
14#include <linux/types.h>
15#include <linux/scatterlist.h>
16
17#include <linux/mmc/host.h>
18#include <linux/mmc/card.h>
19#include <linux/mmc/mmc.h>
20
21#include "core.h"
22#include "card.h"
23#include "host.h"
24#include "mmc_ops.h"
25
26#define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
27
28static const u8 tuning_blk_pattern_4bit[] = {
29 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
30 0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
31 0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
32 0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
33 0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
34 0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
35 0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
36 0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
37};
38
39static const u8 tuning_blk_pattern_8bit[] = {
40 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
41 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
42 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
43 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
44 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
45 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
46 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
47 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
48 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
49 0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
50 0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
51 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
52 0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
53 0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
54 0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
55 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
56};
57
58int __mmc_send_status(struct mmc_card *card, u32 *status, unsigned int retries)
59{
60 int err;
61 struct mmc_command cmd = {};
62
63 cmd.opcode = MMC_SEND_STATUS;
64 if (!mmc_host_is_spi(card->host))
65 cmd.arg = card->rca << 16;
66 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
67
68 err = mmc_wait_for_cmd(card->host, &cmd, retries);
69 if (err)
70 return err;
71
72 /* NOTE: callers are required to understand the difference
73 * between "native" and SPI format status words!
74 */
75 if (status)
76 *status = cmd.resp[0];
77
78 return 0;
79}
80EXPORT_SYMBOL_GPL(__mmc_send_status);
81
82int mmc_send_status(struct mmc_card *card, u32 *status)
83{
84 return __mmc_send_status(card, status, MMC_CMD_RETRIES);
85}
86EXPORT_SYMBOL_GPL(mmc_send_status);
87
88static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
89{
90 struct mmc_command cmd = {};
91
92 cmd.opcode = MMC_SELECT_CARD;
93
94 if (card) {
95 cmd.arg = card->rca << 16;
96 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
97 } else {
98 cmd.arg = 0;
99 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
100 }
101
102 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
103}
104
105int mmc_select_card(struct mmc_card *card)
106{
107
108 return _mmc_select_card(card->host, card);
109}
110
111int mmc_deselect_cards(struct mmc_host *host)
112{
113 return _mmc_select_card(host, NULL);
114}
115
116/*
117 * Write the value specified in the device tree or board code into the optional
118 * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
119 * drive strength of the DAT and CMD outputs. The actual meaning of a given
120 * value is hardware dependant.
121 * The presence of the DSR register can be determined from the CSD register,
122 * bit 76.
123 */
124int mmc_set_dsr(struct mmc_host *host)
125{
126 struct mmc_command cmd = {};
127
128 cmd.opcode = MMC_SET_DSR;
129
130 cmd.arg = (host->dsr << 16) | 0xffff;
131 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
132
133 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
134}
135
136int mmc_go_idle(struct mmc_host *host)
137{
138 int err;
139 struct mmc_command cmd = {};
140
141 /*
142 * Non-SPI hosts need to prevent chipselect going active during
143 * GO_IDLE; that would put chips into SPI mode. Remind them of
144 * that in case of hardware that won't pull up DAT3/nCS otherwise.
145 *
146 * SPI hosts ignore ios.chip_select; it's managed according to
147 * rules that must accommodate non-MMC slaves which this layer
148 * won't even know about.
149 */
150 if (!mmc_host_is_spi(host)) {
151 mmc_set_chip_select(host, MMC_CS_HIGH);
152 mmc_delay(1);
153 }
154
155 cmd.opcode = MMC_GO_IDLE_STATE;
156 cmd.arg = 0;
157 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
158
159 err = mmc_wait_for_cmd(host, &cmd, 0);
160
161 mmc_delay(1);
162
163 if (!mmc_host_is_spi(host)) {
164 mmc_set_chip_select(host, MMC_CS_DONTCARE);
165 mmc_delay(1);
166 }
167
168 host->use_spi_crc = 0;
169
170 return err;
171}
172
173int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
174{
175 struct mmc_command cmd = {};
176 int i, err = 0;
177
178 cmd.opcode = MMC_SEND_OP_COND;
179 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
180 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
181
182 for (i = 100; i; i--) {
183 err = mmc_wait_for_cmd(host, &cmd, 0);
184 if (err)
185 break;
186
187 /* if we're just probing, do a single pass */
188 if (ocr == 0)
189 break;
190
191 /* otherwise wait until reset completes */
192 if (mmc_host_is_spi(host)) {
193 if (!(cmd.resp[0] & R1_SPI_IDLE))
194 break;
195 } else {
196 if (cmd.resp[0] & MMC_CARD_BUSY)
197 break;
198 }
199
200 err = -ETIMEDOUT;
201
202 mmc_delay(10);
203 }
204
205 if (rocr && !mmc_host_is_spi(host))
206 *rocr = cmd.resp[0];
207
208 return err;
209}
210
211int mmc_set_relative_addr(struct mmc_card *card)
212{
213 struct mmc_command cmd = {};
214
215 cmd.opcode = MMC_SET_RELATIVE_ADDR;
216 cmd.arg = card->rca << 16;
217 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
218
219 return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
220}
221
222static int
223mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
224{
225 int err;
226 struct mmc_command cmd = {};
227
228 cmd.opcode = opcode;
229 cmd.arg = arg;
230 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
231
232 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
233 if (err)
234 return err;
235
236 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
237
238 return 0;
239}
240
241/*
242 * NOTE: void *buf, caller for the buf is required to use DMA-capable
243 * buffer or on-stack buffer (with some overhead in callee).
244 */
245static int
246mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
247 u32 opcode, void *buf, unsigned len)
248{
249 struct mmc_request mrq = {};
250 struct mmc_command cmd = {};
251 struct mmc_data data = {};
252 struct scatterlist sg;
253
254 mrq.cmd = &cmd;
255 mrq.data = &data;
256
257 cmd.opcode = opcode;
258 cmd.arg = 0;
259
260 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
261 * rely on callers to never use this with "native" calls for reading
262 * CSD or CID. Native versions of those commands use the R2 type,
263 * not R1 plus a data block.
264 */
265 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
266
267 data.blksz = len;
268 data.blocks = 1;
269 data.flags = MMC_DATA_READ;
270 data.sg = &sg;
271 data.sg_len = 1;
272
273 sg_init_one(&sg, buf, len);
274
275 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
276 /*
277 * The spec states that CSR and CID accesses have a timeout
278 * of 64 clock cycles.
279 */
280 data.timeout_ns = 0;
281 data.timeout_clks = 64;
282 } else
283 mmc_set_data_timeout(&data, card);
284
285 mmc_wait_for_req(host, &mrq);
286
287 if (cmd.error)
288 return cmd.error;
289 if (data.error)
290 return data.error;
291
292 return 0;
293}
294
295static int mmc_spi_send_csd(struct mmc_card *card, u32 *csd)
296{
297 int ret, i;
298 __be32 *csd_tmp;
299
300 csd_tmp = kzalloc(16, GFP_KERNEL);
301 if (!csd_tmp)
302 return -ENOMEM;
303
304 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
305 if (ret)
306 goto err;
307
308 for (i = 0; i < 4; i++)
309 csd[i] = be32_to_cpu(csd_tmp[i]);
310
311err:
312 kfree(csd_tmp);
313 return ret;
314}
315
316int mmc_send_csd(struct mmc_card *card, u32 *csd)
317{
318 if (mmc_host_is_spi(card->host))
319 return mmc_spi_send_csd(card, csd);
320
321 return mmc_send_cxd_native(card->host, card->rca << 16, csd,
322 MMC_SEND_CSD);
323}
324
325static int mmc_spi_send_cid(struct mmc_host *host, u32 *cid)
326{
327 int ret, i;
328 __be32 *cid_tmp;
329
330 cid_tmp = kzalloc(16, GFP_KERNEL);
331 if (!cid_tmp)
332 return -ENOMEM;
333
334 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
335 if (ret)
336 goto err;
337
338 for (i = 0; i < 4; i++)
339 cid[i] = be32_to_cpu(cid_tmp[i]);
340
341err:
342 kfree(cid_tmp);
343 return ret;
344}
345
346int mmc_send_cid(struct mmc_host *host, u32 *cid)
347{
348 if (mmc_host_is_spi(host))
349 return mmc_spi_send_cid(host, cid);
350
351 return mmc_send_cxd_native(host, 0, cid, MMC_ALL_SEND_CID);
352}
353
354int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
355{
356 int err;
357 u8 *ext_csd;
358
359 if (!card || !new_ext_csd)
360 return -EINVAL;
361
362 if (!mmc_can_ext_csd(card))
363 return -EOPNOTSUPP;
364
365 /*
366 * As the ext_csd is so large and mostly unused, we don't store the
367 * raw block in mmc_card.
368 */
369 ext_csd = kzalloc(512, GFP_KERNEL);
370 if (!ext_csd)
371 return -ENOMEM;
372
373 err = mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd,
374 512);
375 if (err)
376 kfree(ext_csd);
377 else
378 *new_ext_csd = ext_csd;
379
380 return err;
381}
382EXPORT_SYMBOL_GPL(mmc_get_ext_csd);
383
384int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
385{
386 struct mmc_command cmd = {};
387 int err;
388
389 cmd.opcode = MMC_SPI_READ_OCR;
390 cmd.arg = highcap ? (1 << 30) : 0;
391 cmd.flags = MMC_RSP_SPI_R3;
392
393 err = mmc_wait_for_cmd(host, &cmd, 0);
394
395 *ocrp = cmd.resp[1];
396 return err;
397}
398
399int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
400{
401 struct mmc_command cmd = {};
402 int err;
403
404 cmd.opcode = MMC_SPI_CRC_ON_OFF;
405 cmd.flags = MMC_RSP_SPI_R1;
406 cmd.arg = use_crc;
407
408 err = mmc_wait_for_cmd(host, &cmd, 0);
409 if (!err)
410 host->use_spi_crc = use_crc;
411 return err;
412}
413
414static int mmc_switch_status_error(struct mmc_host *host, u32 status)
415{
416 if (mmc_host_is_spi(host)) {
417 if (status & R1_SPI_ILLEGAL_COMMAND)
418 return -EBADMSG;
419 } else {
420 if (status & 0xFDFFA000)
421 pr_warn("%s: unexpected status %#x after switch\n",
422 mmc_hostname(host), status);
423 if (status & R1_SWITCH_ERROR)
424 return -EBADMSG;
425 }
426 return 0;
427}
428
429/* Caller must hold re-tuning */
430int __mmc_switch_status(struct mmc_card *card, bool crc_err_fatal)
431{
432 u32 status;
433 int err;
434
435 err = mmc_send_status(card, &status);
436 if (!crc_err_fatal && err == -EILSEQ)
437 return 0;
438 if (err)
439 return err;
440
441 return mmc_switch_status_error(card->host, status);
442}
443
444int mmc_switch_status(struct mmc_card *card)
445{
446 return __mmc_switch_status(card, true);
447}
448
449static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
450 bool send_status, bool retry_crc_err)
451{
452 struct mmc_host *host = card->host;
453 int err;
454 unsigned long timeout;
455 u32 status = 0;
456 bool expired = false;
457 bool busy = false;
458
459 /* We have an unspecified cmd timeout, use the fallback value. */
460 if (!timeout_ms)
461 timeout_ms = MMC_OPS_TIMEOUT_MS;
462
463 /*
464 * In cases when not allowed to poll by using CMD13 or because we aren't
465 * capable of polling by using ->card_busy(), then rely on waiting the
466 * stated timeout to be sufficient.
467 */
468 if (!send_status && !host->ops->card_busy) {
469 mmc_delay(timeout_ms);
470 return 0;
471 }
472
473 timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
474 do {
475 /*
476 * Due to the possibility of being preempted while polling,
477 * check the expiration time first.
478 */
479 expired = time_after(jiffies, timeout);
480
481 if (host->ops->card_busy) {
482 busy = host->ops->card_busy(host);
483 } else {
484 err = mmc_send_status(card, &status);
485 if (retry_crc_err && err == -EILSEQ) {
486 busy = true;
487 } else if (err) {
488 return err;
489 } else {
490 err = mmc_switch_status_error(host, status);
491 if (err)
492 return err;
493 busy = R1_CURRENT_STATE(status) == R1_STATE_PRG;
494 }
495 }
496
497 /* Timeout if the device still remains busy. */
498 if (expired && busy) {
499 pr_err("%s: Card stuck being busy! %s\n",
500 mmc_hostname(host), __func__);
501 return -ETIMEDOUT;
502 }
503 } while (busy);
504
505 return 0;
506}
507
508/**
509 * __mmc_switch - modify EXT_CSD register
510 * @card: the MMC card associated with the data transfer
511 * @set: cmd set values
512 * @index: EXT_CSD register index
513 * @value: value to program into EXT_CSD register
514 * @timeout_ms: timeout (ms) for operation performed by register write,
515 * timeout of zero implies maximum possible timeout
516 * @timing: new timing to change to
517 * @use_busy_signal: use the busy signal as response type
518 * @send_status: send status cmd to poll for busy
519 * @retry_crc_err: retry when CRC errors when polling with CMD13 for busy
520 *
521 * Modifies the EXT_CSD register for selected card.
522 */
523int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
524 unsigned int timeout_ms, unsigned char timing,
525 bool use_busy_signal, bool send_status, bool retry_crc_err)
526{
527 struct mmc_host *host = card->host;
528 int err;
529 struct mmc_command cmd = {};
530 bool use_r1b_resp = use_busy_signal;
531 unsigned char old_timing = host->ios.timing;
532
533 mmc_retune_hold(host);
534
535 /*
536 * If the cmd timeout and the max_busy_timeout of the host are both
537 * specified, let's validate them. A failure means we need to prevent
538 * the host from doing hw busy detection, which is done by converting
539 * to a R1 response instead of a R1B.
540 */
541 if (timeout_ms && host->max_busy_timeout &&
542 (timeout_ms > host->max_busy_timeout))
543 use_r1b_resp = false;
544
545 cmd.opcode = MMC_SWITCH;
546 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
547 (index << 16) |
548 (value << 8) |
549 set;
550 cmd.flags = MMC_CMD_AC;
551 if (use_r1b_resp) {
552 cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
553 /*
554 * A busy_timeout of zero means the host can decide to use
555 * whatever value it finds suitable.
556 */
557 cmd.busy_timeout = timeout_ms;
558 } else {
559 cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
560 }
561
562 if (index == EXT_CSD_SANITIZE_START)
563 cmd.sanitize_busy = true;
564
565 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
566 if (err)
567 goto out;
568
569 /* No need to check card status in case of unblocking command */
570 if (!use_busy_signal)
571 goto out;
572
573 /*If SPI or used HW busy detection above, then we don't need to poll. */
574 if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
575 mmc_host_is_spi(host))
576 goto out_tim;
577
578 /* Let's try to poll to find out when the command is completed. */
579 err = mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err);
580 if (err)
581 goto out;
582
583out_tim:
584 /* Switch to new timing before check switch status. */
585 if (timing)
586 mmc_set_timing(host, timing);
587
588 if (send_status) {
589 err = mmc_switch_status(card);
590 if (err && timing)
591 mmc_set_timing(host, old_timing);
592 }
593out:
594 mmc_retune_release(host);
595
596 return err;
597}
598
599int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
600 unsigned int timeout_ms)
601{
602 return __mmc_switch(card, set, index, value, timeout_ms, 0,
603 true, true, false);
604}
605EXPORT_SYMBOL_GPL(mmc_switch);
606
607int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
608{
609 struct mmc_request mrq = {};
610 struct mmc_command cmd = {};
611 struct mmc_data data = {};
612 struct scatterlist sg;
613 struct mmc_ios *ios = &host->ios;
614 const u8 *tuning_block_pattern;
615 int size, err = 0;
616 u8 *data_buf;
617
618 if (ios->bus_width == MMC_BUS_WIDTH_8) {
619 tuning_block_pattern = tuning_blk_pattern_8bit;
620 size = sizeof(tuning_blk_pattern_8bit);
621 } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
622 tuning_block_pattern = tuning_blk_pattern_4bit;
623 size = sizeof(tuning_blk_pattern_4bit);
624 } else
625 return -EINVAL;
626
627 data_buf = kzalloc(size, GFP_KERNEL);
628 if (!data_buf)
629 return -ENOMEM;
630
631 mrq.cmd = &cmd;
632 mrq.data = &data;
633
634 cmd.opcode = opcode;
635 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
636
637 data.blksz = size;
638 data.blocks = 1;
639 data.flags = MMC_DATA_READ;
640
641 /*
642 * According to the tuning specs, Tuning process
643 * is normally shorter 40 executions of CMD19,
644 * and timeout value should be shorter than 150 ms
645 */
646 data.timeout_ns = 150 * NSEC_PER_MSEC;
647
648 data.sg = &sg;
649 data.sg_len = 1;
650 sg_init_one(&sg, data_buf, size);
651
652 mmc_wait_for_req(host, &mrq);
653
654 if (cmd_error)
655 *cmd_error = cmd.error;
656
657 if (cmd.error) {
658 err = cmd.error;
659 goto out;
660 }
661
662 if (data.error) {
663 err = data.error;
664 goto out;
665 }
666
667 if (memcmp(data_buf, tuning_block_pattern, size))
668 err = -EIO;
669
670out:
671 kfree(data_buf);
672 return err;
673}
674EXPORT_SYMBOL_GPL(mmc_send_tuning);
675
676int mmc_abort_tuning(struct mmc_host *host, u32 opcode)
677{
678 struct mmc_command cmd = {};
679
680 /*
681 * eMMC specification specifies that CMD12 can be used to stop a tuning
682 * command, but SD specification does not, so do nothing unless it is
683 * eMMC.
684 */
685 if (opcode != MMC_SEND_TUNING_BLOCK_HS200)
686 return 0;
687
688 cmd.opcode = MMC_STOP_TRANSMISSION;
689 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
690
691 /*
692 * For drivers that override R1 to R1b, set an arbitrary timeout based
693 * on the tuning timeout i.e. 150ms.
694 */
695 cmd.busy_timeout = 150;
696
697 return mmc_wait_for_cmd(host, &cmd, 0);
698}
699EXPORT_SYMBOL_GPL(mmc_abort_tuning);
700
701static int
702mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
703 u8 len)
704{
705 struct mmc_request mrq = {};
706 struct mmc_command cmd = {};
707 struct mmc_data data = {};
708 struct scatterlist sg;
709 u8 *data_buf;
710 u8 *test_buf;
711 int i, err;
712 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
713 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
714
715 /* dma onto stack is unsafe/nonportable, but callers to this
716 * routine normally provide temporary on-stack buffers ...
717 */
718 data_buf = kmalloc(len, GFP_KERNEL);
719 if (!data_buf)
720 return -ENOMEM;
721
722 if (len == 8)
723 test_buf = testdata_8bit;
724 else if (len == 4)
725 test_buf = testdata_4bit;
726 else {
727 pr_err("%s: Invalid bus_width %d\n",
728 mmc_hostname(host), len);
729 kfree(data_buf);
730 return -EINVAL;
731 }
732
733 if (opcode == MMC_BUS_TEST_W)
734 memcpy(data_buf, test_buf, len);
735
736 mrq.cmd = &cmd;
737 mrq.data = &data;
738 cmd.opcode = opcode;
739 cmd.arg = 0;
740
741 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
742 * rely on callers to never use this with "native" calls for reading
743 * CSD or CID. Native versions of those commands use the R2 type,
744 * not R1 plus a data block.
745 */
746 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
747
748 data.blksz = len;
749 data.blocks = 1;
750 if (opcode == MMC_BUS_TEST_R)
751 data.flags = MMC_DATA_READ;
752 else
753 data.flags = MMC_DATA_WRITE;
754
755 data.sg = &sg;
756 data.sg_len = 1;
757 mmc_set_data_timeout(&data, card);
758 sg_init_one(&sg, data_buf, len);
759 mmc_wait_for_req(host, &mrq);
760 err = 0;
761 if (opcode == MMC_BUS_TEST_R) {
762 for (i = 0; i < len / 4; i++)
763 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
764 err = -EIO;
765 break;
766 }
767 }
768 kfree(data_buf);
769
770 if (cmd.error)
771 return cmd.error;
772 if (data.error)
773 return data.error;
774
775 return err;
776}
777
778int mmc_bus_test(struct mmc_card *card, u8 bus_width)
779{
780 int width;
781
782 if (bus_width == MMC_BUS_WIDTH_8)
783 width = 8;
784 else if (bus_width == MMC_BUS_WIDTH_4)
785 width = 4;
786 else if (bus_width == MMC_BUS_WIDTH_1)
787 return 0; /* no need for test */
788 else
789 return -EINVAL;
790
791 /*
792 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
793 * is a problem. This improves chances that the test will work.
794 */
795 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
796 return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
797}
798
799static int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
800{
801 struct mmc_command cmd = {};
802 unsigned int opcode;
803 int err;
804
805 if (!card->ext_csd.hpi) {
806 pr_warn("%s: Card didn't support HPI command\n",
807 mmc_hostname(card->host));
808 return -EINVAL;
809 }
810
811 opcode = card->ext_csd.hpi_cmd;
812 if (opcode == MMC_STOP_TRANSMISSION)
813 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
814 else if (opcode == MMC_SEND_STATUS)
815 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
816
817 cmd.opcode = opcode;
818 cmd.arg = card->rca << 16 | 1;
819
820 err = mmc_wait_for_cmd(card->host, &cmd, 0);
821 if (err) {
822 pr_warn("%s: error %d interrupting operation. "
823 "HPI command response %#x\n", mmc_hostname(card->host),
824 err, cmd.resp[0]);
825 return err;
826 }
827 if (status)
828 *status = cmd.resp[0];
829
830 return 0;
831}
832
833/**
834 * mmc_interrupt_hpi - Issue for High priority Interrupt
835 * @card: the MMC card associated with the HPI transfer
836 *
837 * Issued High Priority Interrupt, and check for card status
838 * until out-of prg-state.
839 */
840int mmc_interrupt_hpi(struct mmc_card *card)
841{
842 int err;
843 u32 status;
844 unsigned long prg_wait;
845
846 if (!card->ext_csd.hpi_en) {
847 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
848 return 1;
849 }
850
851 err = mmc_send_status(card, &status);
852 if (err) {
853 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
854 goto out;
855 }
856
857 switch (R1_CURRENT_STATE(status)) {
858 case R1_STATE_IDLE:
859 case R1_STATE_READY:
860 case R1_STATE_STBY:
861 case R1_STATE_TRAN:
862 /*
863 * In idle and transfer states, HPI is not needed and the caller
864 * can issue the next intended command immediately
865 */
866 goto out;
867 case R1_STATE_PRG:
868 break;
869 default:
870 /* In all other states, it's illegal to issue HPI */
871 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
872 mmc_hostname(card->host), R1_CURRENT_STATE(status));
873 err = -EINVAL;
874 goto out;
875 }
876
877 err = mmc_send_hpi_cmd(card, &status);
878 if (err)
879 goto out;
880
881 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
882 do {
883 err = mmc_send_status(card, &status);
884
885 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
886 break;
887 if (time_after(jiffies, prg_wait))
888 err = -ETIMEDOUT;
889 } while (!err);
890
891out:
892 return err;
893}
894
895int mmc_can_ext_csd(struct mmc_card *card)
896{
897 return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
898}
899
900/**
901 * mmc_stop_bkops - stop ongoing BKOPS
902 * @card: MMC card to check BKOPS
903 *
904 * Send HPI command to stop ongoing background operations to
905 * allow rapid servicing of foreground operations, e.g. read/
906 * writes. Wait until the card comes out of the programming state
907 * to avoid errors in servicing read/write requests.
908 */
909int mmc_stop_bkops(struct mmc_card *card)
910{
911 int err = 0;
912
913 err = mmc_interrupt_hpi(card);
914
915 /*
916 * If err is EINVAL, we can't issue an HPI.
917 * It should complete the BKOPS.
918 */
919 if (!err || (err == -EINVAL)) {
920 mmc_card_clr_doing_bkops(card);
921 mmc_retune_release(card->host);
922 err = 0;
923 }
924
925 return err;
926}
927
928static int mmc_read_bkops_status(struct mmc_card *card)
929{
930 int err;
931 u8 *ext_csd;
932
933 err = mmc_get_ext_csd(card, &ext_csd);
934 if (err)
935 return err;
936
937 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
938 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
939 kfree(ext_csd);
940 return 0;
941}
942
943/**
944 * mmc_start_bkops - start BKOPS for supported cards
945 * @card: MMC card to start BKOPS
946 * @from_exception: A flag to indicate if this function was
947 * called due to an exception raised by the card
948 *
949 * Start background operations whenever requested.
950 * When the urgent BKOPS bit is set in a R1 command response
951 * then background operations should be started immediately.
952*/
953void mmc_start_bkops(struct mmc_card *card, bool from_exception)
954{
955 int err;
956 int timeout;
957 bool use_busy_signal;
958
959 if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
960 return;
961
962 err = mmc_read_bkops_status(card);
963 if (err) {
964 pr_err("%s: Failed to read bkops status: %d\n",
965 mmc_hostname(card->host), err);
966 return;
967 }
968
969 if (!card->ext_csd.raw_bkops_status)
970 return;
971
972 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
973 from_exception)
974 return;
975
976 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
977 timeout = MMC_OPS_TIMEOUT_MS;
978 use_busy_signal = true;
979 } else {
980 timeout = 0;
981 use_busy_signal = false;
982 }
983
984 mmc_retune_hold(card->host);
985
986 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
987 EXT_CSD_BKOPS_START, 1, timeout, 0,
988 use_busy_signal, true, false);
989 if (err) {
990 pr_warn("%s: Error %d starting bkops\n",
991 mmc_hostname(card->host), err);
992 mmc_retune_release(card->host);
993 return;
994 }
995
996 /*
997 * For urgent bkops status (LEVEL_2 and more)
998 * bkops executed synchronously, otherwise
999 * the operation is in progress
1000 */
1001 if (!use_busy_signal)
1002 mmc_card_set_doing_bkops(card);
1003 else
1004 mmc_retune_release(card->host);
1005}
1006EXPORT_SYMBOL(mmc_start_bkops);
1007
1008/*
1009 * Flush the cache to the non-volatile storage.
1010 */
1011int mmc_flush_cache(struct mmc_card *card)
1012{
1013 int err = 0;
1014
1015 if (mmc_card_mmc(card) &&
1016 (card->ext_csd.cache_size > 0) &&
1017 (card->ext_csd.cache_ctrl & 1)) {
1018 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1019 EXT_CSD_FLUSH_CACHE, 1, 0);
1020 if (err)
1021 pr_err("%s: cache flush error %d\n",
1022 mmc_hostname(card->host), err);
1023 }
1024
1025 return err;
1026}
1027EXPORT_SYMBOL(mmc_flush_cache);
1028
1029static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
1030{
1031 u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;
1032 int err;
1033
1034 if (!card->ext_csd.cmdq_support)
1035 return -EOPNOTSUPP;
1036
1037 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CMDQ_MODE_EN,
1038 val, card->ext_csd.generic_cmd6_time);
1039 if (!err)
1040 card->ext_csd.cmdq_en = enable;
1041
1042 return err;
1043}
1044
1045int mmc_cmdq_enable(struct mmc_card *card)
1046{
1047 return mmc_cmdq_switch(card, true);
1048}
1049EXPORT_SYMBOL_GPL(mmc_cmdq_enable);
1050
1051int mmc_cmdq_disable(struct mmc_card *card)
1052{
1053 return mmc_cmdq_switch(card, false);
1054}
1055EXPORT_SYMBOL_GPL(mmc_cmdq_disable);