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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 "mmc_ops.h"
23
24static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
25{
26 int err;
27 struct mmc_command cmd = {0};
28
29 BUG_ON(!host);
30
31 cmd.opcode = MMC_SELECT_CARD;
32
33 if (card) {
34 cmd.arg = card->rca << 16;
35 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
36 } else {
37 cmd.arg = 0;
38 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
39 }
40
41 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
42 if (err)
43 return err;
44
45 return 0;
46}
47
48int mmc_select_card(struct mmc_card *card)
49{
50 BUG_ON(!card);
51
52 return _mmc_select_card(card->host, card);
53}
54
55int mmc_deselect_cards(struct mmc_host *host)
56{
57 return _mmc_select_card(host, NULL);
58}
59
60int mmc_card_sleepawake(struct mmc_host *host, int sleep)
61{
62 struct mmc_command cmd = {0};
63 struct mmc_card *card = host->card;
64 int err;
65
66 if (sleep)
67 mmc_deselect_cards(host);
68
69 cmd.opcode = MMC_SLEEP_AWAKE;
70 cmd.arg = card->rca << 16;
71 if (sleep)
72 cmd.arg |= 1 << 15;
73
74 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
75 err = mmc_wait_for_cmd(host, &cmd, 0);
76 if (err)
77 return err;
78
79 /*
80 * If the host does not wait while the card signals busy, then we will
81 * will have to wait the sleep/awake timeout. Note, we cannot use the
82 * SEND_STATUS command to poll the status because that command (and most
83 * others) is invalid while the card sleeps.
84 */
85 if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
86 mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
87
88 if (!sleep)
89 err = mmc_select_card(card);
90
91 return err;
92}
93
94int mmc_go_idle(struct mmc_host *host)
95{
96 int err;
97 struct mmc_command cmd = {0};
98
99 /*
100 * Non-SPI hosts need to prevent chipselect going active during
101 * GO_IDLE; that would put chips into SPI mode. Remind them of
102 * that in case of hardware that won't pull up DAT3/nCS otherwise.
103 *
104 * SPI hosts ignore ios.chip_select; it's managed according to
105 * rules that must accommodate non-MMC slaves which this layer
106 * won't even know about.
107 */
108 if (!mmc_host_is_spi(host)) {
109 mmc_set_chip_select(host, MMC_CS_HIGH);
110 mmc_delay(1);
111 }
112
113 cmd.opcode = MMC_GO_IDLE_STATE;
114 cmd.arg = 0;
115 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
116
117 err = mmc_wait_for_cmd(host, &cmd, 0);
118
119 mmc_delay(1);
120
121 if (!mmc_host_is_spi(host)) {
122 mmc_set_chip_select(host, MMC_CS_DONTCARE);
123 mmc_delay(1);
124 }
125
126 host->use_spi_crc = 0;
127
128 return err;
129}
130
131int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
132{
133 struct mmc_command cmd = {0};
134 int i, err = 0;
135
136 BUG_ON(!host);
137
138 cmd.opcode = MMC_SEND_OP_COND;
139 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
140 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
141
142 for (i = 100; i; i--) {
143 err = mmc_wait_for_cmd(host, &cmd, 0);
144 if (err)
145 break;
146
147 /* if we're just probing, do a single pass */
148 if (ocr == 0)
149 break;
150
151 /* otherwise wait until reset completes */
152 if (mmc_host_is_spi(host)) {
153 if (!(cmd.resp[0] & R1_SPI_IDLE))
154 break;
155 } else {
156 if (cmd.resp[0] & MMC_CARD_BUSY)
157 break;
158 }
159
160 err = -ETIMEDOUT;
161
162 mmc_delay(10);
163 }
164
165 if (rocr && !mmc_host_is_spi(host))
166 *rocr = cmd.resp[0];
167
168 return err;
169}
170
171int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
172{
173 int err;
174 struct mmc_command cmd = {0};
175
176 BUG_ON(!host);
177 BUG_ON(!cid);
178
179 cmd.opcode = MMC_ALL_SEND_CID;
180 cmd.arg = 0;
181 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
182
183 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
184 if (err)
185 return err;
186
187 memcpy(cid, cmd.resp, sizeof(u32) * 4);
188
189 return 0;
190}
191
192int mmc_set_relative_addr(struct mmc_card *card)
193{
194 int err;
195 struct mmc_command cmd = {0};
196
197 BUG_ON(!card);
198 BUG_ON(!card->host);
199
200 cmd.opcode = MMC_SET_RELATIVE_ADDR;
201 cmd.arg = card->rca << 16;
202 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
203
204 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
205 if (err)
206 return err;
207
208 return 0;
209}
210
211static int
212mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
213{
214 int err;
215 struct mmc_command cmd = {0};
216
217 BUG_ON(!host);
218 BUG_ON(!cxd);
219
220 cmd.opcode = opcode;
221 cmd.arg = arg;
222 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
223
224 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
225 if (err)
226 return err;
227
228 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
229
230 return 0;
231}
232
233static int
234mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
235 u32 opcode, void *buf, unsigned len)
236{
237 struct mmc_request mrq = {NULL};
238 struct mmc_command cmd = {0};
239 struct mmc_data data = {0};
240 struct scatterlist sg;
241 void *data_buf;
242
243 /* dma onto stack is unsafe/nonportable, but callers to this
244 * routine normally provide temporary on-stack buffers ...
245 */
246 data_buf = kmalloc(len, GFP_KERNEL);
247 if (data_buf == NULL)
248 return -ENOMEM;
249
250 mrq.cmd = &cmd;
251 mrq.data = &data;
252
253 cmd.opcode = opcode;
254 cmd.arg = 0;
255
256 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
257 * rely on callers to never use this with "native" calls for reading
258 * CSD or CID. Native versions of those commands use the R2 type,
259 * not R1 plus a data block.
260 */
261 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
262
263 data.blksz = len;
264 data.blocks = 1;
265 data.flags = MMC_DATA_READ;
266 data.sg = &sg;
267 data.sg_len = 1;
268
269 sg_init_one(&sg, data_buf, len);
270
271 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
272 /*
273 * The spec states that CSR and CID accesses have a timeout
274 * of 64 clock cycles.
275 */
276 data.timeout_ns = 0;
277 data.timeout_clks = 64;
278 } else
279 mmc_set_data_timeout(&data, card);
280
281 mmc_wait_for_req(host, &mrq);
282
283 memcpy(buf, data_buf, len);
284 kfree(data_buf);
285
286 if (cmd.error)
287 return cmd.error;
288 if (data.error)
289 return data.error;
290
291 return 0;
292}
293
294int mmc_send_csd(struct mmc_card *card, u32 *csd)
295{
296 int ret, i;
297
298 if (!mmc_host_is_spi(card->host))
299 return mmc_send_cxd_native(card->host, card->rca << 16,
300 csd, MMC_SEND_CSD);
301
302 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
303 if (ret)
304 return ret;
305
306 for (i = 0;i < 4;i++)
307 csd[i] = be32_to_cpu(csd[i]);
308
309 return 0;
310}
311
312int mmc_send_cid(struct mmc_host *host, u32 *cid)
313{
314 int ret, i;
315
316 if (!mmc_host_is_spi(host)) {
317 if (!host->card)
318 return -EINVAL;
319 return mmc_send_cxd_native(host, host->card->rca << 16,
320 cid, MMC_SEND_CID);
321 }
322
323 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
324 if (ret)
325 return ret;
326
327 for (i = 0;i < 4;i++)
328 cid[i] = be32_to_cpu(cid[i]);
329
330 return 0;
331}
332
333int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
334{
335 return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
336 ext_csd, 512);
337}
338
339int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
340{
341 struct mmc_command cmd = {0};
342 int err;
343
344 cmd.opcode = MMC_SPI_READ_OCR;
345 cmd.arg = highcap ? (1 << 30) : 0;
346 cmd.flags = MMC_RSP_SPI_R3;
347
348 err = mmc_wait_for_cmd(host, &cmd, 0);
349
350 *ocrp = cmd.resp[1];
351 return err;
352}
353
354int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
355{
356 struct mmc_command cmd = {0};
357 int err;
358
359 cmd.opcode = MMC_SPI_CRC_ON_OFF;
360 cmd.flags = MMC_RSP_SPI_R1;
361 cmd.arg = use_crc;
362
363 err = mmc_wait_for_cmd(host, &cmd, 0);
364 if (!err)
365 host->use_spi_crc = use_crc;
366 return err;
367}
368
369/**
370 * mmc_switch - modify EXT_CSD register
371 * @card: the MMC card associated with the data transfer
372 * @set: cmd set values
373 * @index: EXT_CSD register index
374 * @value: value to program into EXT_CSD register
375 * @timeout_ms: timeout (ms) for operation performed by register write,
376 * timeout of zero implies maximum possible timeout
377 *
378 * Modifies the EXT_CSD register for selected card.
379 */
380int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
381 unsigned int timeout_ms)
382{
383 int err;
384 struct mmc_command cmd = {0};
385 u32 status;
386
387 BUG_ON(!card);
388 BUG_ON(!card->host);
389
390 cmd.opcode = MMC_SWITCH;
391 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
392 (index << 16) |
393 (value << 8) |
394 set;
395 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
396 cmd.cmd_timeout_ms = timeout_ms;
397
398 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
399 if (err)
400 return err;
401
402 /* Must check status to be sure of no errors */
403 do {
404 err = mmc_send_status(card, &status);
405 if (err)
406 return err;
407 if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
408 break;
409 if (mmc_host_is_spi(card->host))
410 break;
411 } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
412
413 if (mmc_host_is_spi(card->host)) {
414 if (status & R1_SPI_ILLEGAL_COMMAND)
415 return -EBADMSG;
416 } else {
417 if (status & 0xFDFFA000)
418 pr_warning("%s: unexpected status %#x after "
419 "switch", mmc_hostname(card->host), status);
420 if (status & R1_SWITCH_ERROR)
421 return -EBADMSG;
422 }
423
424 return 0;
425}
426EXPORT_SYMBOL_GPL(mmc_switch);
427
428int mmc_send_status(struct mmc_card *card, u32 *status)
429{
430 int err;
431 struct mmc_command cmd = {0};
432
433 BUG_ON(!card);
434 BUG_ON(!card->host);
435
436 cmd.opcode = MMC_SEND_STATUS;
437 if (!mmc_host_is_spi(card->host))
438 cmd.arg = card->rca << 16;
439 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
440
441 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
442 if (err)
443 return err;
444
445 /* NOTE: callers are required to understand the difference
446 * between "native" and SPI format status words!
447 */
448 if (status)
449 *status = cmd.resp[0];
450
451 return 0;
452}
453
454static int
455mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
456 u8 len)
457{
458 struct mmc_request mrq = {NULL};
459 struct mmc_command cmd = {0};
460 struct mmc_data data = {0};
461 struct scatterlist sg;
462 u8 *data_buf;
463 u8 *test_buf;
464 int i, err;
465 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
466 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
467
468 /* dma onto stack is unsafe/nonportable, but callers to this
469 * routine normally provide temporary on-stack buffers ...
470 */
471 data_buf = kmalloc(len, GFP_KERNEL);
472 if (!data_buf)
473 return -ENOMEM;
474
475 if (len == 8)
476 test_buf = testdata_8bit;
477 else if (len == 4)
478 test_buf = testdata_4bit;
479 else {
480 pr_err("%s: Invalid bus_width %d\n",
481 mmc_hostname(host), len);
482 kfree(data_buf);
483 return -EINVAL;
484 }
485
486 if (opcode == MMC_BUS_TEST_W)
487 memcpy(data_buf, test_buf, len);
488
489 mrq.cmd = &cmd;
490 mrq.data = &data;
491 cmd.opcode = opcode;
492 cmd.arg = 0;
493
494 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
495 * rely on callers to never use this with "native" calls for reading
496 * CSD or CID. Native versions of those commands use the R2 type,
497 * not R1 plus a data block.
498 */
499 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
500
501 data.blksz = len;
502 data.blocks = 1;
503 if (opcode == MMC_BUS_TEST_R)
504 data.flags = MMC_DATA_READ;
505 else
506 data.flags = MMC_DATA_WRITE;
507
508 data.sg = &sg;
509 data.sg_len = 1;
510 sg_init_one(&sg, data_buf, len);
511 mmc_wait_for_req(host, &mrq);
512 err = 0;
513 if (opcode == MMC_BUS_TEST_R) {
514 for (i = 0; i < len / 4; i++)
515 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
516 err = -EIO;
517 break;
518 }
519 }
520 kfree(data_buf);
521
522 if (cmd.error)
523 return cmd.error;
524 if (data.error)
525 return data.error;
526
527 return err;
528}
529
530int mmc_bus_test(struct mmc_card *card, u8 bus_width)
531{
532 int err, width;
533
534 if (bus_width == MMC_BUS_WIDTH_8)
535 width = 8;
536 else if (bus_width == MMC_BUS_WIDTH_4)
537 width = 4;
538 else if (bus_width == MMC_BUS_WIDTH_1)
539 return 0; /* no need for test */
540 else
541 return -EINVAL;
542
543 /*
544 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
545 * is a problem. This improves chances that the test will work.
546 */
547 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
548 err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
549 return err;
550}
551
552int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
553{
554 struct mmc_command cmd = {0};
555 unsigned int opcode;
556 int err;
557
558 if (!card->ext_csd.hpi) {
559 pr_warning("%s: Card didn't support HPI command\n",
560 mmc_hostname(card->host));
561 return -EINVAL;
562 }
563
564 opcode = card->ext_csd.hpi_cmd;
565 if (opcode == MMC_STOP_TRANSMISSION)
566 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
567 else if (opcode == MMC_SEND_STATUS)
568 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
569
570 cmd.opcode = opcode;
571 cmd.arg = card->rca << 16 | 1;
572 cmd.cmd_timeout_ms = card->ext_csd.out_of_int_time;
573
574 err = mmc_wait_for_cmd(card->host, &cmd, 0);
575 if (err) {
576 pr_warn("%s: error %d interrupting operation. "
577 "HPI command response %#x\n", mmc_hostname(card->host),
578 err, cmd.resp[0]);
579 return err;
580 }
581 if (status)
582 *status = cmd.resp[0];
583
584 return 0;
585}