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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * linux/drivers/mmc/core/mmc_ops.h
4 *
5 * Copyright 2006-2007 Pierre Ossman
6 */
7
8#include <linux/slab.h>
9#include <linux/export.h>
10#include <linux/types.h>
11#include <linux/scatterlist.h>
12
13#include <linux/mmc/host.h>
14#include <linux/mmc/card.h>
15#include <linux/mmc/mmc.h>
16
17#include "core.h"
18#include "card.h"
19#include "host.h"
20#include "mmc_ops.h"
21
22#define MMC_BKOPS_TIMEOUT_MS (120 * 1000) /* 120s */
23#define MMC_SANITIZE_TIMEOUT_MS (240 * 1000) /* 240s */
24#define MMC_OP_COND_PERIOD_US (4 * 1000) /* 4ms */
25#define MMC_OP_COND_TIMEOUT_MS 1000 /* 1s */
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
57struct mmc_busy_data {
58 struct mmc_card *card;
59 bool retry_crc_err;
60 enum mmc_busy_cmd busy_cmd;
61};
62
63struct mmc_op_cond_busy_data {
64 struct mmc_host *host;
65 u32 ocr;
66 struct mmc_command *cmd;
67};
68
69int __mmc_send_status(struct mmc_card *card, u32 *status, unsigned int retries)
70{
71 int err;
72 struct mmc_command cmd = {};
73
74 cmd.opcode = MMC_SEND_STATUS;
75 if (!mmc_host_is_spi(card->host))
76 cmd.arg = card->rca << 16;
77 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
78
79 err = mmc_wait_for_cmd(card->host, &cmd, retries);
80 if (err)
81 return err;
82
83 /* NOTE: callers are required to understand the difference
84 * between "native" and SPI format status words!
85 */
86 if (status)
87 *status = cmd.resp[0];
88
89 return 0;
90}
91EXPORT_SYMBOL_GPL(__mmc_send_status);
92
93int mmc_send_status(struct mmc_card *card, u32 *status)
94{
95 return __mmc_send_status(card, status, MMC_CMD_RETRIES);
96}
97EXPORT_SYMBOL_GPL(mmc_send_status);
98
99static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
100{
101 struct mmc_command cmd = {};
102
103 cmd.opcode = MMC_SELECT_CARD;
104
105 if (card) {
106 cmd.arg = card->rca << 16;
107 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
108 } else {
109 cmd.arg = 0;
110 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
111 }
112
113 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
114}
115
116int mmc_select_card(struct mmc_card *card)
117{
118
119 return _mmc_select_card(card->host, card);
120}
121
122int mmc_deselect_cards(struct mmc_host *host)
123{
124 return _mmc_select_card(host, NULL);
125}
126
127/*
128 * Write the value specified in the device tree or board code into the optional
129 * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
130 * drive strength of the DAT and CMD outputs. The actual meaning of a given
131 * value is hardware dependant.
132 * The presence of the DSR register can be determined from the CSD register,
133 * bit 76.
134 */
135int mmc_set_dsr(struct mmc_host *host)
136{
137 struct mmc_command cmd = {};
138
139 cmd.opcode = MMC_SET_DSR;
140
141 cmd.arg = (host->dsr << 16) | 0xffff;
142 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
143
144 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
145}
146
147int mmc_go_idle(struct mmc_host *host)
148{
149 int err;
150 struct mmc_command cmd = {};
151
152 /*
153 * Non-SPI hosts need to prevent chipselect going active during
154 * GO_IDLE; that would put chips into SPI mode. Remind them of
155 * that in case of hardware that won't pull up DAT3/nCS otherwise.
156 *
157 * SPI hosts ignore ios.chip_select; it's managed according to
158 * rules that must accommodate non-MMC slaves which this layer
159 * won't even know about.
160 */
161 if (!mmc_host_is_spi(host)) {
162 mmc_set_chip_select(host, MMC_CS_HIGH);
163 mmc_delay(1);
164 }
165
166 cmd.opcode = MMC_GO_IDLE_STATE;
167 cmd.arg = 0;
168 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
169
170 err = mmc_wait_for_cmd(host, &cmd, 0);
171
172 mmc_delay(1);
173
174 if (!mmc_host_is_spi(host)) {
175 mmc_set_chip_select(host, MMC_CS_DONTCARE);
176 mmc_delay(1);
177 }
178
179 host->use_spi_crc = 0;
180
181 return err;
182}
183
184static int __mmc_send_op_cond_cb(void *cb_data, bool *busy)
185{
186 struct mmc_op_cond_busy_data *data = cb_data;
187 struct mmc_host *host = data->host;
188 struct mmc_command *cmd = data->cmd;
189 u32 ocr = data->ocr;
190 int err = 0;
191
192 err = mmc_wait_for_cmd(host, cmd, 0);
193 if (err)
194 return err;
195
196 if (mmc_host_is_spi(host)) {
197 if (!(cmd->resp[0] & R1_SPI_IDLE)) {
198 *busy = false;
199 return 0;
200 }
201 } else {
202 if (cmd->resp[0] & MMC_CARD_BUSY) {
203 *busy = false;
204 return 0;
205 }
206 }
207
208 *busy = true;
209
210 /*
211 * According to eMMC specification v5.1 section 6.4.3, we
212 * should issue CMD1 repeatedly in the idle state until
213 * the eMMC is ready. Otherwise some eMMC devices seem to enter
214 * the inactive mode after mmc_init_card() issued CMD0 when
215 * the eMMC device is busy.
216 */
217 if (!ocr && !mmc_host_is_spi(host))
218 cmd->arg = cmd->resp[0] | BIT(30);
219
220 return 0;
221}
222
223int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
224{
225 struct mmc_command cmd = {};
226 int err = 0;
227 struct mmc_op_cond_busy_data cb_data = {
228 .host = host,
229 .ocr = ocr,
230 .cmd = &cmd
231 };
232
233 cmd.opcode = MMC_SEND_OP_COND;
234 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
235 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
236
237 err = __mmc_poll_for_busy(host, MMC_OP_COND_PERIOD_US,
238 MMC_OP_COND_TIMEOUT_MS,
239 &__mmc_send_op_cond_cb, &cb_data);
240 if (err)
241 return err;
242
243 if (rocr && !mmc_host_is_spi(host))
244 *rocr = cmd.resp[0];
245
246 return err;
247}
248
249int mmc_set_relative_addr(struct mmc_card *card)
250{
251 struct mmc_command cmd = {};
252
253 cmd.opcode = MMC_SET_RELATIVE_ADDR;
254 cmd.arg = card->rca << 16;
255 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
256
257 return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
258}
259
260static int
261mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
262{
263 int err;
264 struct mmc_command cmd = {};
265
266 cmd.opcode = opcode;
267 cmd.arg = arg;
268 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
269
270 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
271 if (err)
272 return err;
273
274 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
275
276 return 0;
277}
278
279/*
280 * NOTE: void *buf, caller for the buf is required to use DMA-capable
281 * buffer or on-stack buffer (with some overhead in callee).
282 */
283int mmc_send_adtc_data(struct mmc_card *card, struct mmc_host *host, u32 opcode,
284 u32 args, void *buf, unsigned len)
285{
286 struct mmc_request mrq = {};
287 struct mmc_command cmd = {};
288 struct mmc_data data = {};
289 struct scatterlist sg;
290
291 mrq.cmd = &cmd;
292 mrq.data = &data;
293
294 cmd.opcode = opcode;
295 cmd.arg = args;
296
297 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
298 * rely on callers to never use this with "native" calls for reading
299 * CSD or CID. Native versions of those commands use the R2 type,
300 * not R1 plus a data block.
301 */
302 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
303
304 data.blksz = len;
305 data.blocks = 1;
306 data.flags = MMC_DATA_READ;
307 data.sg = &sg;
308 data.sg_len = 1;
309
310 sg_init_one(&sg, buf, len);
311
312 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
313 /*
314 * The spec states that CSR and CID accesses have a timeout
315 * of 64 clock cycles.
316 */
317 data.timeout_ns = 0;
318 data.timeout_clks = 64;
319 } else
320 mmc_set_data_timeout(&data, card);
321
322 mmc_wait_for_req(host, &mrq);
323
324 if (cmd.error)
325 return cmd.error;
326 if (data.error)
327 return data.error;
328
329 return 0;
330}
331
332static int mmc_spi_send_cxd(struct mmc_host *host, u32 *cxd, u32 opcode)
333{
334 int ret, i;
335 __be32 *cxd_tmp;
336
337 cxd_tmp = kzalloc(16, GFP_KERNEL);
338 if (!cxd_tmp)
339 return -ENOMEM;
340
341 ret = mmc_send_adtc_data(NULL, host, opcode, 0, cxd_tmp, 16);
342 if (ret)
343 goto err;
344
345 for (i = 0; i < 4; i++)
346 cxd[i] = be32_to_cpu(cxd_tmp[i]);
347
348err:
349 kfree(cxd_tmp);
350 return ret;
351}
352
353int mmc_send_csd(struct mmc_card *card, u32 *csd)
354{
355 if (mmc_host_is_spi(card->host))
356 return mmc_spi_send_cxd(card->host, csd, MMC_SEND_CSD);
357
358 return mmc_send_cxd_native(card->host, card->rca << 16, csd,
359 MMC_SEND_CSD);
360}
361
362int mmc_send_cid(struct mmc_host *host, u32 *cid)
363{
364 if (mmc_host_is_spi(host))
365 return mmc_spi_send_cxd(host, cid, MMC_SEND_CID);
366
367 return mmc_send_cxd_native(host, 0, cid, MMC_ALL_SEND_CID);
368}
369
370int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
371{
372 int err;
373 u8 *ext_csd;
374
375 if (!card || !new_ext_csd)
376 return -EINVAL;
377
378 if (!mmc_can_ext_csd(card))
379 return -EOPNOTSUPP;
380
381 /*
382 * As the ext_csd is so large and mostly unused, we don't store the
383 * raw block in mmc_card.
384 */
385 ext_csd = kzalloc(512, GFP_KERNEL);
386 if (!ext_csd)
387 return -ENOMEM;
388
389 err = mmc_send_adtc_data(card, card->host, MMC_SEND_EXT_CSD, 0, ext_csd,
390 512);
391 if (err)
392 kfree(ext_csd);
393 else
394 *new_ext_csd = ext_csd;
395
396 return err;
397}
398EXPORT_SYMBOL_GPL(mmc_get_ext_csd);
399
400int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
401{
402 struct mmc_command cmd = {};
403 int err;
404
405 cmd.opcode = MMC_SPI_READ_OCR;
406 cmd.arg = highcap ? (1 << 30) : 0;
407 cmd.flags = MMC_RSP_SPI_R3;
408
409 err = mmc_wait_for_cmd(host, &cmd, 0);
410
411 *ocrp = cmd.resp[1];
412 return err;
413}
414
415int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
416{
417 struct mmc_command cmd = {};
418 int err;
419
420 cmd.opcode = MMC_SPI_CRC_ON_OFF;
421 cmd.flags = MMC_RSP_SPI_R1;
422 cmd.arg = use_crc;
423
424 err = mmc_wait_for_cmd(host, &cmd, 0);
425 if (!err)
426 host->use_spi_crc = use_crc;
427 return err;
428}
429
430static int mmc_switch_status_error(struct mmc_host *host, u32 status)
431{
432 if (mmc_host_is_spi(host)) {
433 if (status & R1_SPI_ILLEGAL_COMMAND)
434 return -EBADMSG;
435 } else {
436 if (R1_STATUS(status))
437 pr_warn("%s: unexpected status %#x after switch\n",
438 mmc_hostname(host), status);
439 if (status & R1_SWITCH_ERROR)
440 return -EBADMSG;
441 }
442 return 0;
443}
444
445/* Caller must hold re-tuning */
446int mmc_switch_status(struct mmc_card *card, bool crc_err_fatal)
447{
448 u32 status;
449 int err;
450
451 err = mmc_send_status(card, &status);
452 if (!crc_err_fatal && err == -EILSEQ)
453 return 0;
454 if (err)
455 return err;
456
457 return mmc_switch_status_error(card->host, status);
458}
459
460static int mmc_busy_cb(void *cb_data, bool *busy)
461{
462 struct mmc_busy_data *data = cb_data;
463 struct mmc_host *host = data->card->host;
464 u32 status = 0;
465 int err;
466
467 if (data->busy_cmd != MMC_BUSY_IO && host->ops->card_busy) {
468 *busy = host->ops->card_busy(host);
469 return 0;
470 }
471
472 err = mmc_send_status(data->card, &status);
473 if (data->retry_crc_err && err == -EILSEQ) {
474 *busy = true;
475 return 0;
476 }
477 if (err)
478 return err;
479
480 switch (data->busy_cmd) {
481 case MMC_BUSY_CMD6:
482 err = mmc_switch_status_error(host, status);
483 break;
484 case MMC_BUSY_ERASE:
485 err = R1_STATUS(status) ? -EIO : 0;
486 break;
487 case MMC_BUSY_HPI:
488 case MMC_BUSY_EXTR_SINGLE:
489 case MMC_BUSY_IO:
490 break;
491 default:
492 err = -EINVAL;
493 }
494
495 if (err)
496 return err;
497
498 *busy = !mmc_ready_for_data(status);
499 return 0;
500}
501
502int __mmc_poll_for_busy(struct mmc_host *host, unsigned int period_us,
503 unsigned int timeout_ms,
504 int (*busy_cb)(void *cb_data, bool *busy),
505 void *cb_data)
506{
507 int err;
508 unsigned long timeout;
509 unsigned int udelay = period_us ? period_us : 32, udelay_max = 32768;
510 bool expired = false;
511 bool busy = false;
512
513 timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
514 do {
515 /*
516 * Due to the possibility of being preempted while polling,
517 * check the expiration time first.
518 */
519 expired = time_after(jiffies, timeout);
520
521 err = (*busy_cb)(cb_data, &busy);
522 if (err)
523 return err;
524
525 /* Timeout if the device still remains busy. */
526 if (expired && busy) {
527 pr_err("%s: Card stuck being busy! %s\n",
528 mmc_hostname(host), __func__);
529 return -ETIMEDOUT;
530 }
531
532 /* Throttle the polling rate to avoid hogging the CPU. */
533 if (busy) {
534 usleep_range(udelay, udelay * 2);
535 if (udelay < udelay_max)
536 udelay *= 2;
537 }
538 } while (busy);
539
540 return 0;
541}
542EXPORT_SYMBOL_GPL(__mmc_poll_for_busy);
543
544int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
545 bool retry_crc_err, enum mmc_busy_cmd busy_cmd)
546{
547 struct mmc_host *host = card->host;
548 struct mmc_busy_data cb_data;
549
550 cb_data.card = card;
551 cb_data.retry_crc_err = retry_crc_err;
552 cb_data.busy_cmd = busy_cmd;
553
554 return __mmc_poll_for_busy(host, 0, timeout_ms, &mmc_busy_cb, &cb_data);
555}
556EXPORT_SYMBOL_GPL(mmc_poll_for_busy);
557
558bool mmc_prepare_busy_cmd(struct mmc_host *host, struct mmc_command *cmd,
559 unsigned int timeout_ms)
560{
561 /*
562 * If the max_busy_timeout of the host is specified, make sure it's
563 * enough to fit the used timeout_ms. In case it's not, let's instruct
564 * the host to avoid HW busy detection, by converting to a R1 response
565 * instead of a R1B. Note, some hosts requires R1B, which also means
566 * they are on their own when it comes to deal with the busy timeout.
567 */
568 if (!(host->caps & MMC_CAP_NEED_RSP_BUSY) && host->max_busy_timeout &&
569 (timeout_ms > host->max_busy_timeout)) {
570 cmd->flags = MMC_CMD_AC | MMC_RSP_SPI_R1 | MMC_RSP_R1;
571 return false;
572 }
573
574 cmd->flags = MMC_CMD_AC | MMC_RSP_SPI_R1B | MMC_RSP_R1B;
575 cmd->busy_timeout = timeout_ms;
576 return true;
577}
578
579/**
580 * __mmc_switch - modify EXT_CSD register
581 * @card: the MMC card associated with the data transfer
582 * @set: cmd set values
583 * @index: EXT_CSD register index
584 * @value: value to program into EXT_CSD register
585 * @timeout_ms: timeout (ms) for operation performed by register write,
586 * timeout of zero implies maximum possible timeout
587 * @timing: new timing to change to
588 * @send_status: send status cmd to poll for busy
589 * @retry_crc_err: retry when CRC errors when polling with CMD13 for busy
590 * @retries: number of retries
591 *
592 * Modifies the EXT_CSD register for selected card.
593 */
594int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
595 unsigned int timeout_ms, unsigned char timing,
596 bool send_status, bool retry_crc_err, unsigned int retries)
597{
598 struct mmc_host *host = card->host;
599 int err;
600 struct mmc_command cmd = {};
601 bool use_r1b_resp;
602 unsigned char old_timing = host->ios.timing;
603
604 mmc_retune_hold(host);
605
606 if (!timeout_ms) {
607 pr_warn("%s: unspecified timeout for CMD6 - use generic\n",
608 mmc_hostname(host));
609 timeout_ms = card->ext_csd.generic_cmd6_time;
610 }
611
612 cmd.opcode = MMC_SWITCH;
613 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
614 (index << 16) |
615 (value << 8) |
616 set;
617 use_r1b_resp = mmc_prepare_busy_cmd(host, &cmd, timeout_ms);
618
619 err = mmc_wait_for_cmd(host, &cmd, retries);
620 if (err)
621 goto out;
622
623 /*If SPI or used HW busy detection above, then we don't need to poll. */
624 if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
625 mmc_host_is_spi(host))
626 goto out_tim;
627
628 /*
629 * If the host doesn't support HW polling via the ->card_busy() ops and
630 * when it's not allowed to poll by using CMD13, then we need to rely on
631 * waiting the stated timeout to be sufficient.
632 */
633 if (!send_status && !host->ops->card_busy) {
634 mmc_delay(timeout_ms);
635 goto out_tim;
636 }
637
638 /* Let's try to poll to find out when the command is completed. */
639 err = mmc_poll_for_busy(card, timeout_ms, retry_crc_err, MMC_BUSY_CMD6);
640 if (err)
641 goto out;
642
643out_tim:
644 /* Switch to new timing before check switch status. */
645 if (timing)
646 mmc_set_timing(host, timing);
647
648 if (send_status) {
649 err = mmc_switch_status(card, true);
650 if (err && timing)
651 mmc_set_timing(host, old_timing);
652 }
653out:
654 mmc_retune_release(host);
655
656 return err;
657}
658
659int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
660 unsigned int timeout_ms)
661{
662 return __mmc_switch(card, set, index, value, timeout_ms, 0,
663 true, false, MMC_CMD_RETRIES);
664}
665EXPORT_SYMBOL_GPL(mmc_switch);
666
667int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
668{
669 struct mmc_request mrq = {};
670 struct mmc_command cmd = {};
671 struct mmc_data data = {};
672 struct scatterlist sg;
673 struct mmc_ios *ios = &host->ios;
674 const u8 *tuning_block_pattern;
675 int size, err = 0;
676 u8 *data_buf;
677
678 if (ios->bus_width == MMC_BUS_WIDTH_8) {
679 tuning_block_pattern = tuning_blk_pattern_8bit;
680 size = sizeof(tuning_blk_pattern_8bit);
681 } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
682 tuning_block_pattern = tuning_blk_pattern_4bit;
683 size = sizeof(tuning_blk_pattern_4bit);
684 } else
685 return -EINVAL;
686
687 data_buf = kzalloc(size, GFP_KERNEL);
688 if (!data_buf)
689 return -ENOMEM;
690
691 mrq.cmd = &cmd;
692 mrq.data = &data;
693
694 cmd.opcode = opcode;
695 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
696
697 data.blksz = size;
698 data.blocks = 1;
699 data.flags = MMC_DATA_READ;
700
701 /*
702 * According to the tuning specs, Tuning process
703 * is normally shorter 40 executions of CMD19,
704 * and timeout value should be shorter than 150 ms
705 */
706 data.timeout_ns = 150 * NSEC_PER_MSEC;
707
708 data.sg = &sg;
709 data.sg_len = 1;
710 sg_init_one(&sg, data_buf, size);
711
712 mmc_wait_for_req(host, &mrq);
713
714 if (cmd_error)
715 *cmd_error = cmd.error;
716
717 if (cmd.error) {
718 err = cmd.error;
719 goto out;
720 }
721
722 if (data.error) {
723 err = data.error;
724 goto out;
725 }
726
727 if (memcmp(data_buf, tuning_block_pattern, size))
728 err = -EIO;
729
730out:
731 kfree(data_buf);
732 return err;
733}
734EXPORT_SYMBOL_GPL(mmc_send_tuning);
735
736int mmc_send_abort_tuning(struct mmc_host *host, u32 opcode)
737{
738 struct mmc_command cmd = {};
739
740 /*
741 * eMMC specification specifies that CMD12 can be used to stop a tuning
742 * command, but SD specification does not, so do nothing unless it is
743 * eMMC.
744 */
745 if (opcode != MMC_SEND_TUNING_BLOCK_HS200)
746 return 0;
747
748 cmd.opcode = MMC_STOP_TRANSMISSION;
749 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
750
751 /*
752 * For drivers that override R1 to R1b, set an arbitrary timeout based
753 * on the tuning timeout i.e. 150ms.
754 */
755 cmd.busy_timeout = 150;
756
757 return mmc_wait_for_cmd(host, &cmd, 0);
758}
759EXPORT_SYMBOL_GPL(mmc_send_abort_tuning);
760
761static int
762mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
763 u8 len)
764{
765 struct mmc_request mrq = {};
766 struct mmc_command cmd = {};
767 struct mmc_data data = {};
768 struct scatterlist sg;
769 u8 *data_buf;
770 u8 *test_buf;
771 int i, err;
772 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
773 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
774
775 /* dma onto stack is unsafe/nonportable, but callers to this
776 * routine normally provide temporary on-stack buffers ...
777 */
778 data_buf = kmalloc(len, GFP_KERNEL);
779 if (!data_buf)
780 return -ENOMEM;
781
782 if (len == 8)
783 test_buf = testdata_8bit;
784 else if (len == 4)
785 test_buf = testdata_4bit;
786 else {
787 pr_err("%s: Invalid bus_width %d\n",
788 mmc_hostname(host), len);
789 kfree(data_buf);
790 return -EINVAL;
791 }
792
793 if (opcode == MMC_BUS_TEST_W)
794 memcpy(data_buf, test_buf, len);
795
796 mrq.cmd = &cmd;
797 mrq.data = &data;
798 cmd.opcode = opcode;
799 cmd.arg = 0;
800
801 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
802 * rely on callers to never use this with "native" calls for reading
803 * CSD or CID. Native versions of those commands use the R2 type,
804 * not R1 plus a data block.
805 */
806 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
807
808 data.blksz = len;
809 data.blocks = 1;
810 if (opcode == MMC_BUS_TEST_R)
811 data.flags = MMC_DATA_READ;
812 else
813 data.flags = MMC_DATA_WRITE;
814
815 data.sg = &sg;
816 data.sg_len = 1;
817 mmc_set_data_timeout(&data, card);
818 sg_init_one(&sg, data_buf, len);
819 mmc_wait_for_req(host, &mrq);
820 err = 0;
821 if (opcode == MMC_BUS_TEST_R) {
822 for (i = 0; i < len / 4; i++)
823 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
824 err = -EIO;
825 break;
826 }
827 }
828 kfree(data_buf);
829
830 if (cmd.error)
831 return cmd.error;
832 if (data.error)
833 return data.error;
834
835 return err;
836}
837
838int mmc_bus_test(struct mmc_card *card, u8 bus_width)
839{
840 int width;
841
842 if (bus_width == MMC_BUS_WIDTH_8)
843 width = 8;
844 else if (bus_width == MMC_BUS_WIDTH_4)
845 width = 4;
846 else if (bus_width == MMC_BUS_WIDTH_1)
847 return 0; /* no need for test */
848 else
849 return -EINVAL;
850
851 /*
852 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
853 * is a problem. This improves chances that the test will work.
854 */
855 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
856 return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
857}
858
859static int mmc_send_hpi_cmd(struct mmc_card *card)
860{
861 unsigned int busy_timeout_ms = card->ext_csd.out_of_int_time;
862 struct mmc_host *host = card->host;
863 bool use_r1b_resp = false;
864 struct mmc_command cmd = {};
865 int err;
866
867 cmd.opcode = card->ext_csd.hpi_cmd;
868 cmd.arg = card->rca << 16 | 1;
869 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
870
871 if (cmd.opcode == MMC_STOP_TRANSMISSION)
872 use_r1b_resp = mmc_prepare_busy_cmd(host, &cmd,
873 busy_timeout_ms);
874
875 err = mmc_wait_for_cmd(host, &cmd, 0);
876 if (err) {
877 pr_warn("%s: HPI error %d. Command response %#x\n",
878 mmc_hostname(host), err, cmd.resp[0]);
879 return err;
880 }
881
882 /* No need to poll when using HW busy detection. */
883 if (host->caps & MMC_CAP_WAIT_WHILE_BUSY && use_r1b_resp)
884 return 0;
885
886 /* Let's poll to find out when the HPI request completes. */
887 return mmc_poll_for_busy(card, busy_timeout_ms, false, MMC_BUSY_HPI);
888}
889
890/**
891 * mmc_interrupt_hpi - Issue for High priority Interrupt
892 * @card: the MMC card associated with the HPI transfer
893 *
894 * Issued High Priority Interrupt, and check for card status
895 * until out-of prg-state.
896 */
897static int mmc_interrupt_hpi(struct mmc_card *card)
898{
899 int err;
900 u32 status;
901
902 if (!card->ext_csd.hpi_en) {
903 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
904 return 1;
905 }
906
907 err = mmc_send_status(card, &status);
908 if (err) {
909 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
910 goto out;
911 }
912
913 switch (R1_CURRENT_STATE(status)) {
914 case R1_STATE_IDLE:
915 case R1_STATE_READY:
916 case R1_STATE_STBY:
917 case R1_STATE_TRAN:
918 /*
919 * In idle and transfer states, HPI is not needed and the caller
920 * can issue the next intended command immediately
921 */
922 goto out;
923 case R1_STATE_PRG:
924 break;
925 default:
926 /* In all other states, it's illegal to issue HPI */
927 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
928 mmc_hostname(card->host), R1_CURRENT_STATE(status));
929 err = -EINVAL;
930 goto out;
931 }
932
933 err = mmc_send_hpi_cmd(card);
934out:
935 return err;
936}
937
938int mmc_can_ext_csd(struct mmc_card *card)
939{
940 return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
941}
942
943static int mmc_read_bkops_status(struct mmc_card *card)
944{
945 int err;
946 u8 *ext_csd;
947
948 err = mmc_get_ext_csd(card, &ext_csd);
949 if (err)
950 return err;
951
952 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
953 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
954 kfree(ext_csd);
955 return 0;
956}
957
958/**
959 * mmc_run_bkops - Run BKOPS for supported cards
960 * @card: MMC card to run BKOPS for
961 *
962 * Run background operations synchronously for cards having manual BKOPS
963 * enabled and in case it reports urgent BKOPS level.
964*/
965void mmc_run_bkops(struct mmc_card *card)
966{
967 int err;
968
969 if (!card->ext_csd.man_bkops_en)
970 return;
971
972 err = mmc_read_bkops_status(card);
973 if (err) {
974 pr_err("%s: Failed to read bkops status: %d\n",
975 mmc_hostname(card->host), err);
976 return;
977 }
978
979 if (!card->ext_csd.raw_bkops_status ||
980 card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2)
981 return;
982
983 mmc_retune_hold(card->host);
984
985 /*
986 * For urgent BKOPS status, LEVEL_2 and higher, let's execute
987 * synchronously. Future wise, we may consider to start BKOPS, for less
988 * urgent levels by using an asynchronous background task, when idle.
989 */
990 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
991 EXT_CSD_BKOPS_START, 1, MMC_BKOPS_TIMEOUT_MS);
992 /*
993 * If the BKOPS timed out, the card is probably still busy in the
994 * R1_STATE_PRG. Rather than continue to wait, let's try to abort
995 * it with a HPI command to get back into R1_STATE_TRAN.
996 */
997 if (err == -ETIMEDOUT && !mmc_interrupt_hpi(card))
998 pr_warn("%s: BKOPS aborted\n", mmc_hostname(card->host));
999 else if (err)
1000 pr_warn("%s: Error %d running bkops\n",
1001 mmc_hostname(card->host), err);
1002
1003 mmc_retune_release(card->host);
1004}
1005EXPORT_SYMBOL(mmc_run_bkops);
1006
1007static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
1008{
1009 u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;
1010 int err;
1011
1012 if (!card->ext_csd.cmdq_support)
1013 return -EOPNOTSUPP;
1014
1015 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CMDQ_MODE_EN,
1016 val, card->ext_csd.generic_cmd6_time);
1017 if (!err)
1018 card->ext_csd.cmdq_en = enable;
1019
1020 return err;
1021}
1022
1023int mmc_cmdq_enable(struct mmc_card *card)
1024{
1025 return mmc_cmdq_switch(card, true);
1026}
1027EXPORT_SYMBOL_GPL(mmc_cmdq_enable);
1028
1029int mmc_cmdq_disable(struct mmc_card *card)
1030{
1031 return mmc_cmdq_switch(card, false);
1032}
1033EXPORT_SYMBOL_GPL(mmc_cmdq_disable);
1034
1035int mmc_sanitize(struct mmc_card *card, unsigned int timeout_ms)
1036{
1037 struct mmc_host *host = card->host;
1038 int err;
1039
1040 if (!mmc_can_sanitize(card)) {
1041 pr_warn("%s: Sanitize not supported\n", mmc_hostname(host));
1042 return -EOPNOTSUPP;
1043 }
1044
1045 if (!timeout_ms)
1046 timeout_ms = MMC_SANITIZE_TIMEOUT_MS;
1047
1048 pr_debug("%s: Sanitize in progress...\n", mmc_hostname(host));
1049
1050 mmc_retune_hold(host);
1051
1052 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_SANITIZE_START,
1053 1, timeout_ms, 0, true, false, 0);
1054 if (err)
1055 pr_err("%s: Sanitize failed err=%d\n", mmc_hostname(host), err);
1056
1057 /*
1058 * If the sanitize operation timed out, the card is probably still busy
1059 * in the R1_STATE_PRG. Rather than continue to wait, let's try to abort
1060 * it with a HPI command to get back into R1_STATE_TRAN.
1061 */
1062 if (err == -ETIMEDOUT && !mmc_interrupt_hpi(card))
1063 pr_warn("%s: Sanitize aborted\n", mmc_hostname(host));
1064
1065 mmc_retune_release(host);
1066
1067 pr_debug("%s: Sanitize completed\n", mmc_hostname(host));
1068 return err;
1069}
1070EXPORT_SYMBOL_GPL(mmc_sanitize);
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}