1 /*
2 * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 /* Define a simple and generic interface to access eMMC and SD-card devices. */
8
9 #include <assert.h>
10 #include <errno.h>
11 #include <stdbool.h>
12 #include <string.h>
13
14 #include <arch_helpers.h>
15 #include <common/debug.h>
16 #include <drivers/delay_timer.h>
17 #include <drivers/mmc.h>
18 #include <lib/utils.h>
19
20 #define MMC_DEFAULT_MAX_RETRIES 5
21 #define SEND_OP_COND_MAX_RETRIES 100
22
23 #define MULT_BY_512K_SHIFT 19
24
25 static const struct mmc_ops *ops;
26 static unsigned int mmc_ocr_value;
27 static struct mmc_csd_emmc mmc_csd;
28 static unsigned char mmc_ext_csd[512] __aligned(16);
29 static unsigned int mmc_flags;
30 static struct mmc_device_info *mmc_dev_info;
31 static unsigned int rca;
32 static unsigned int scr[2]__aligned(16) = { 0 };
33
34 static const unsigned char tran_speed_base[16] = {
35 0, 10, 12, 13, 15, 20, 26, 30, 35, 40, 45, 52, 55, 60, 70, 80
36 };
37
38 static const unsigned char sd_tran_speed_base[16] = {
39 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80
40 };
41
is_cmd23_enabled(void)42 static bool is_cmd23_enabled(void)
43 {
44 return ((mmc_flags & MMC_FLAG_CMD23) != 0U);
45 }
46
mmc_send_cmd(unsigned int idx,unsigned int arg,unsigned int r_type,unsigned int * r_data)47 static int mmc_send_cmd(unsigned int idx, unsigned int arg,
48 unsigned int r_type, unsigned int *r_data)
49 {
50 struct mmc_cmd cmd;
51 int ret;
52
53 zeromem(&cmd, sizeof(struct mmc_cmd));
54
55 cmd.cmd_idx = idx;
56 cmd.cmd_arg = arg;
57 cmd.resp_type = r_type;
58
59 ret = ops->send_cmd(&cmd);
60
61 if ((ret == 0) && (r_data != NULL)) {
62 int i;
63
64 for (i = 0; i < 4; i++) {
65 *r_data = cmd.resp_data[i];
66 r_data++;
67 }
68 }
69
70 if (ret != 0) {
71 VERBOSE("Send command %u error: %d\n", idx, ret);
72 }
73
74 return ret;
75 }
76
mmc_device_state(void)77 static int mmc_device_state(void)
78 {
79 int retries = MMC_DEFAULT_MAX_RETRIES;
80 unsigned int resp_data[4];
81
82 do {
83 int ret;
84
85 if (retries == 0) {
86 ERROR("CMD13 failed after %d retries\n",
87 MMC_DEFAULT_MAX_RETRIES);
88 return -EIO;
89 }
90
91 ret = mmc_send_cmd(MMC_CMD(13), rca << RCA_SHIFT_OFFSET,
92 MMC_RESPONSE_R1, &resp_data[0]);
93 if (ret != 0) {
94 retries--;
95 continue;
96 }
97
98 if ((resp_data[0] & STATUS_SWITCH_ERROR) != 0U) {
99 return -EIO;
100 }
101
102 retries--;
103 } while ((resp_data[0] & STATUS_READY_FOR_DATA) == 0U);
104
105 return MMC_GET_STATE(resp_data[0]);
106 }
107
mmc_set_ext_csd(unsigned int ext_cmd,unsigned int value)108 static int mmc_set_ext_csd(unsigned int ext_cmd, unsigned int value)
109 {
110 int ret;
111
112 ret = mmc_send_cmd(MMC_CMD(6),
113 EXTCSD_WRITE_BYTES | EXTCSD_CMD(ext_cmd) |
114 EXTCSD_VALUE(value) | EXTCSD_CMD_SET_NORMAL,
115 MMC_RESPONSE_R1B, NULL);
116 if (ret != 0) {
117 return ret;
118 }
119
120 do {
121 ret = mmc_device_state();
122 if (ret < 0) {
123 return ret;
124 }
125 } while (ret == MMC_STATE_PRG);
126
127 return 0;
128 }
129
mmc_sd_switch(unsigned int bus_width)130 static int mmc_sd_switch(unsigned int bus_width)
131 {
132 int ret;
133 int retries = MMC_DEFAULT_MAX_RETRIES;
134 unsigned int bus_width_arg = 0;
135
136 ret = ops->prepare(0, (uintptr_t)&scr, sizeof(scr));
137 if (ret != 0) {
138 return ret;
139 }
140
141 /* CMD55: Application Specific Command */
142 ret = mmc_send_cmd(MMC_CMD(55), rca << RCA_SHIFT_OFFSET,
143 MMC_RESPONSE_R5, NULL);
144 if (ret != 0) {
145 return ret;
146 }
147
148 /* ACMD51: SEND_SCR */
149 do {
150 ret = mmc_send_cmd(MMC_ACMD(51), 0, MMC_RESPONSE_R1, NULL);
151 if ((ret != 0) && (retries == 0)) {
152 ERROR("ACMD51 failed after %d retries (ret=%d)\n",
153 MMC_DEFAULT_MAX_RETRIES, ret);
154 return ret;
155 }
156
157 retries--;
158 } while (ret != 0);
159
160 ret = ops->read(0, (uintptr_t)&scr, sizeof(scr));
161 if (ret != 0) {
162 return ret;
163 }
164
165 if (((scr[0] & SD_SCR_BUS_WIDTH_4) != 0U) &&
166 (bus_width == MMC_BUS_WIDTH_4)) {
167 bus_width_arg = 2;
168 }
169
170 /* CMD55: Application Specific Command */
171 ret = mmc_send_cmd(MMC_CMD(55), rca << RCA_SHIFT_OFFSET,
172 MMC_RESPONSE_R5, NULL);
173 if (ret != 0) {
174 return ret;
175 }
176
177 /* ACMD6: SET_BUS_WIDTH */
178 ret = mmc_send_cmd(MMC_ACMD(6), bus_width_arg, MMC_RESPONSE_R1, NULL);
179 if (ret != 0) {
180 return ret;
181 }
182
183 do {
184 ret = mmc_device_state();
185 if (ret < 0) {
186 return ret;
187 }
188 } while (ret == MMC_STATE_PRG);
189
190 return 0;
191 }
192
mmc_set_ios(unsigned int clk,unsigned int bus_width)193 static int mmc_set_ios(unsigned int clk, unsigned int bus_width)
194 {
195 int ret;
196 unsigned int width = bus_width;
197
198 if (mmc_dev_info->mmc_dev_type != MMC_IS_EMMC) {
199 if (width == MMC_BUS_WIDTH_8) {
200 WARN("Wrong bus config for SD-card, force to 4\n");
201 width = MMC_BUS_WIDTH_4;
202 }
203 ret = mmc_sd_switch(width);
204 if (ret != 0) {
205 return ret;
206 }
207 } else if (mmc_csd.spec_vers == 4U) {
208 ret = mmc_set_ext_csd(CMD_EXTCSD_BUS_WIDTH,
209 (unsigned int)width);
210 if (ret != 0) {
211 return ret;
212 }
213 } else {
214 VERBOSE("Wrong MMC type or spec version\n");
215 }
216
217 return ops->set_ios(clk, width);
218 }
219
mmc_fill_device_info(void)220 static int mmc_fill_device_info(void)
221 {
222 unsigned long long c_size;
223 unsigned int speed_idx;
224 unsigned int nb_blocks;
225 unsigned int freq_unit;
226 int ret = 0;
227 struct mmc_csd_sd_v2 *csd_sd_v2;
228
229 switch (mmc_dev_info->mmc_dev_type) {
230 case MMC_IS_EMMC:
231 mmc_dev_info->block_size = MMC_BLOCK_SIZE;
232
233 ret = ops->prepare(0, (uintptr_t)&mmc_ext_csd,
234 sizeof(mmc_ext_csd));
235 if (ret != 0) {
236 return ret;
237 }
238
239 /* MMC CMD8: SEND_EXT_CSD */
240 ret = mmc_send_cmd(MMC_CMD(8), 0, MMC_RESPONSE_R1, NULL);
241 if (ret != 0) {
242 return ret;
243 }
244
245 ret = ops->read(0, (uintptr_t)&mmc_ext_csd,
246 sizeof(mmc_ext_csd));
247 if (ret != 0) {
248 return ret;
249 }
250
251 do {
252 ret = mmc_device_state();
253 if (ret < 0) {
254 return ret;
255 }
256 } while (ret != MMC_STATE_TRAN);
257
258 nb_blocks = (mmc_ext_csd[CMD_EXTCSD_SEC_CNT] << 0) |
259 (mmc_ext_csd[CMD_EXTCSD_SEC_CNT + 1] << 8) |
260 (mmc_ext_csd[CMD_EXTCSD_SEC_CNT + 2] << 16) |
261 (mmc_ext_csd[CMD_EXTCSD_SEC_CNT + 3] << 24);
262
263 mmc_dev_info->device_size = (unsigned long long)nb_blocks *
264 mmc_dev_info->block_size;
265
266 break;
267
268 case MMC_IS_SD:
269 /*
270 * Use the same mmc_csd struct, as required fields here
271 * (READ_BL_LEN, C_SIZE, CSIZE_MULT) are common with eMMC.
272 */
273 mmc_dev_info->block_size = BIT_32(mmc_csd.read_bl_len);
274
275 c_size = ((unsigned long long)mmc_csd.c_size_high << 2U) |
276 (unsigned long long)mmc_csd.c_size_low;
277 assert(c_size != 0xFFFU);
278
279 mmc_dev_info->device_size = (c_size + 1U) *
280 BIT_64(mmc_csd.c_size_mult + 2U) *
281 mmc_dev_info->block_size;
282
283 break;
284
285 case MMC_IS_SD_HC:
286 assert(mmc_csd.csd_structure == 1U);
287
288 mmc_dev_info->block_size = MMC_BLOCK_SIZE;
289
290 /* Need to use mmc_csd_sd_v2 struct */
291 csd_sd_v2 = (struct mmc_csd_sd_v2 *)&mmc_csd;
292 c_size = ((unsigned long long)csd_sd_v2->c_size_high << 16) |
293 (unsigned long long)csd_sd_v2->c_size_low;
294
295 mmc_dev_info->device_size = (c_size + 1U) << MULT_BY_512K_SHIFT;
296
297 break;
298
299 default:
300 ret = -EINVAL;
301 break;
302 }
303
304 if (ret < 0) {
305 return ret;
306 }
307
308 speed_idx = (mmc_csd.tran_speed & CSD_TRAN_SPEED_MULT_MASK) >>
309 CSD_TRAN_SPEED_MULT_SHIFT;
310
311 assert(speed_idx > 0U);
312
313 if (mmc_dev_info->mmc_dev_type == MMC_IS_EMMC) {
314 mmc_dev_info->max_bus_freq = tran_speed_base[speed_idx];
315 } else {
316 mmc_dev_info->max_bus_freq = sd_tran_speed_base[speed_idx];
317 }
318
319 freq_unit = mmc_csd.tran_speed & CSD_TRAN_SPEED_UNIT_MASK;
320 while (freq_unit != 0U) {
321 mmc_dev_info->max_bus_freq *= 10U;
322 --freq_unit;
323 }
324
325 mmc_dev_info->max_bus_freq *= 10000U;
326
327 return 0;
328 }
329
sd_send_op_cond(void)330 static int sd_send_op_cond(void)
331 {
332 int n;
333 unsigned int resp_data[4];
334
335 for (n = 0; n < SEND_OP_COND_MAX_RETRIES; n++) {
336 int ret;
337
338 /* CMD55: Application Specific Command */
339 ret = mmc_send_cmd(MMC_CMD(55), 0, MMC_RESPONSE_R1, NULL);
340 if (ret != 0) {
341 return ret;
342 }
343
344 /* ACMD41: SD_SEND_OP_COND */
345 ret = mmc_send_cmd(MMC_ACMD(41), OCR_HCS |
346 mmc_dev_info->ocr_voltage, MMC_RESPONSE_R3,
347 &resp_data[0]);
348 if (ret != 0) {
349 return ret;
350 }
351
352 if ((resp_data[0] & OCR_POWERUP) != 0U) {
353 mmc_ocr_value = resp_data[0];
354
355 if ((mmc_ocr_value & OCR_HCS) != 0U) {
356 mmc_dev_info->mmc_dev_type = MMC_IS_SD_HC;
357 } else {
358 mmc_dev_info->mmc_dev_type = MMC_IS_SD;
359 }
360
361 return 0;
362 }
363
364 mdelay(10);
365 }
366
367 ERROR("ACMD41 failed after %d retries\n", SEND_OP_COND_MAX_RETRIES);
368
369 return -EIO;
370 }
371
mmc_reset_to_idle(void)372 static int mmc_reset_to_idle(void)
373 {
374 int ret;
375
376 /* CMD0: reset to IDLE */
377 ret = mmc_send_cmd(MMC_CMD(0), 0, 0, NULL);
378 if (ret != 0) {
379 return ret;
380 }
381
382 mdelay(2);
383
384 return 0;
385 }
386
mmc_send_op_cond(void)387 static int mmc_send_op_cond(void)
388 {
389 int ret, n;
390 unsigned int resp_data[4];
391
392 ret = mmc_reset_to_idle();
393 if (ret != 0) {
394 return ret;
395 };
396
397 for (n = 0; n < SEND_OP_COND_MAX_RETRIES; n++) {
398 ret = mmc_send_cmd(MMC_CMD(1), OCR_SECTOR_MODE |
399 OCR_VDD_MIN_2V7 | OCR_VDD_MIN_1V7,
400 MMC_RESPONSE_R3, &resp_data[0]);
401 if (ret != 0) {
402 return ret;
403 }
404
405 if ((resp_data[0] & OCR_POWERUP) != 0U) {
406 mmc_ocr_value = resp_data[0];
407 return 0;
408 }
409
410 mdelay(10);
411 }
412
413 ERROR("CMD1 failed after %d retries\n", SEND_OP_COND_MAX_RETRIES);
414
415 return -EIO;
416 }
417
mmc_enumerate(unsigned int clk,unsigned int bus_width)418 static int mmc_enumerate(unsigned int clk, unsigned int bus_width)
419 {
420 int ret;
421 unsigned int resp_data[4];
422
423 ops->init();
424
425 ret = mmc_reset_to_idle();
426 if (ret != 0) {
427 return ret;
428 };
429
430 if (mmc_dev_info->mmc_dev_type == MMC_IS_EMMC) {
431 ret = mmc_send_op_cond();
432 } else {
433 /* CMD8: Send Interface Condition Command */
434 ret = mmc_send_cmd(MMC_CMD(8), VHS_2_7_3_6_V | CMD8_CHECK_PATTERN,
435 MMC_RESPONSE_R5, &resp_data[0]);
436
437 if ((ret == 0) && ((resp_data[0] & 0xffU) == CMD8_CHECK_PATTERN)) {
438 ret = sd_send_op_cond();
439 }
440 }
441 if (ret != 0) {
442 return ret;
443 }
444
445 /* CMD2: Card Identification */
446 ret = mmc_send_cmd(MMC_CMD(2), 0, MMC_RESPONSE_R2, NULL);
447 if (ret != 0) {
448 return ret;
449 }
450
451 /* CMD3: Set Relative Address */
452 if (mmc_dev_info->mmc_dev_type == MMC_IS_EMMC) {
453 rca = MMC_FIX_RCA;
454 ret = mmc_send_cmd(MMC_CMD(3), rca << RCA_SHIFT_OFFSET,
455 MMC_RESPONSE_R1, NULL);
456 if (ret != 0) {
457 return ret;
458 }
459 } else {
460 ret = mmc_send_cmd(MMC_CMD(3), 0,
461 MMC_RESPONSE_R6, &resp_data[0]);
462 if (ret != 0) {
463 return ret;
464 }
465
466 rca = (resp_data[0] & 0xFFFF0000U) >> 16;
467 }
468
469 /* CMD9: CSD Register */
470 ret = mmc_send_cmd(MMC_CMD(9), rca << RCA_SHIFT_OFFSET,
471 MMC_RESPONSE_R2, &resp_data[0]);
472 if (ret != 0) {
473 return ret;
474 }
475
476 memcpy(&mmc_csd, &resp_data, sizeof(resp_data));
477
478 /* CMD7: Select Card */
479 ret = mmc_send_cmd(MMC_CMD(7), rca << RCA_SHIFT_OFFSET,
480 MMC_RESPONSE_R1, NULL);
481 if (ret != 0) {
482 return ret;
483 }
484
485 do {
486 ret = mmc_device_state();
487 if (ret < 0) {
488 return ret;
489 }
490 } while (ret != MMC_STATE_TRAN);
491
492 ret = mmc_set_ios(clk, bus_width);
493 if (ret != 0) {
494 return ret;
495 }
496
497 return mmc_fill_device_info();
498 }
499
mmc_read_blocks(int lba,uintptr_t buf,size_t size)500 size_t mmc_read_blocks(int lba, uintptr_t buf, size_t size)
501 {
502 int ret;
503 unsigned int cmd_idx, cmd_arg;
504
505 assert((ops != NULL) &&
506 (ops->read != NULL) &&
507 (size != 0U) &&
508 ((size & MMC_BLOCK_MASK) == 0U));
509
510 ret = ops->prepare(lba, buf, size);
511 if (ret != 0) {
512 return 0;
513 }
514
515 if (is_cmd23_enabled()) {
516 /* Set block count */
517 ret = mmc_send_cmd(MMC_CMD(23), size / MMC_BLOCK_SIZE,
518 MMC_RESPONSE_R1, NULL);
519 if (ret != 0) {
520 return 0;
521 }
522
523 cmd_idx = MMC_CMD(18);
524 } else {
525 if (size > MMC_BLOCK_SIZE) {
526 cmd_idx = MMC_CMD(18);
527 } else {
528 cmd_idx = MMC_CMD(17);
529 }
530 }
531
532 if (((mmc_ocr_value & OCR_ACCESS_MODE_MASK) == OCR_BYTE_MODE) &&
533 (mmc_dev_info->mmc_dev_type != MMC_IS_SD_HC)) {
534 cmd_arg = lba * MMC_BLOCK_SIZE;
535 } else {
536 cmd_arg = lba;
537 }
538
539 ret = mmc_send_cmd(cmd_idx, cmd_arg, MMC_RESPONSE_R1, NULL);
540 if (ret != 0) {
541 return 0;
542 }
543
544 ret = ops->read(lba, buf, size);
545 if (ret != 0) {
546 return 0;
547 }
548
549 /* Wait buffer empty */
550 do {
551 ret = mmc_device_state();
552 if (ret < 0) {
553 return 0;
554 }
555 } while ((ret != MMC_STATE_TRAN) && (ret != MMC_STATE_DATA));
556
557 if (!is_cmd23_enabled() && (size > MMC_BLOCK_SIZE)) {
558 ret = mmc_send_cmd(MMC_CMD(12), 0, MMC_RESPONSE_R1B, NULL);
559 if (ret != 0) {
560 return 0;
561 }
562 }
563
564 return size;
565 }
566
mmc_write_blocks(int lba,const uintptr_t buf,size_t size)567 size_t mmc_write_blocks(int lba, const uintptr_t buf, size_t size)
568 {
569 int ret;
570 unsigned int cmd_idx, cmd_arg;
571
572 assert((ops != NULL) &&
573 (ops->write != NULL) &&
574 (size != 0U) &&
575 ((buf & MMC_BLOCK_MASK) == 0U) &&
576 ((size & MMC_BLOCK_MASK) == 0U));
577
578 ret = ops->prepare(lba, buf, size);
579 if (ret != 0) {
580 return 0;
581 }
582
583 if (is_cmd23_enabled()) {
584 /* Set block count */
585 ret = mmc_send_cmd(MMC_CMD(23), size / MMC_BLOCK_SIZE,
586 MMC_RESPONSE_R1, NULL);
587 if (ret != 0) {
588 return 0;
589 }
590
591 cmd_idx = MMC_CMD(25);
592 } else {
593 if (size > MMC_BLOCK_SIZE) {
594 cmd_idx = MMC_CMD(25);
595 } else {
596 cmd_idx = MMC_CMD(24);
597 }
598 }
599
600 if ((mmc_ocr_value & OCR_ACCESS_MODE_MASK) == OCR_BYTE_MODE) {
601 cmd_arg = lba * MMC_BLOCK_SIZE;
602 } else {
603 cmd_arg = lba;
604 }
605
606 ret = mmc_send_cmd(cmd_idx, cmd_arg, MMC_RESPONSE_R1, NULL);
607 if (ret != 0) {
608 return 0;
609 }
610
611 ret = ops->write(lba, buf, size);
612 if (ret != 0) {
613 return 0;
614 }
615
616 /* Wait buffer empty */
617 do {
618 ret = mmc_device_state();
619 if (ret < 0) {
620 return 0;
621 }
622 } while ((ret != MMC_STATE_TRAN) && (ret != MMC_STATE_RCV));
623
624 if (!is_cmd23_enabled() && (size > MMC_BLOCK_SIZE)) {
625 ret = mmc_send_cmd(MMC_CMD(12), 0, MMC_RESPONSE_R1B, NULL);
626 if (ret != 0) {
627 return 0;
628 }
629 }
630
631 return size;
632 }
633
mmc_erase_blocks(int lba,size_t size)634 size_t mmc_erase_blocks(int lba, size_t size)
635 {
636 int ret;
637
638 assert(ops != NULL);
639 assert((size != 0U) && ((size & MMC_BLOCK_MASK) == 0U));
640
641 ret = mmc_send_cmd(MMC_CMD(35), lba, MMC_RESPONSE_R1, NULL);
642 if (ret != 0) {
643 return 0;
644 }
645
646 ret = mmc_send_cmd(MMC_CMD(36), lba + (size / MMC_BLOCK_SIZE) - 1U,
647 MMC_RESPONSE_R1, NULL);
648 if (ret != 0) {
649 return 0;
650 }
651
652 ret = mmc_send_cmd(MMC_CMD(38), lba, MMC_RESPONSE_R1B, NULL);
653 if (ret != 0) {
654 return 0;
655 }
656
657 do {
658 ret = mmc_device_state();
659 if (ret < 0) {
660 return 0;
661 }
662 } while (ret != MMC_STATE_TRAN);
663
664 return size;
665 }
666
mmc_rpmb_enable(void)667 static inline void mmc_rpmb_enable(void)
668 {
669 mmc_set_ext_csd(CMD_EXTCSD_PARTITION_CONFIG,
670 PART_CFG_BOOT_PARTITION1_ENABLE |
671 PART_CFG_PARTITION1_ACCESS);
672 }
673
mmc_rpmb_disable(void)674 static inline void mmc_rpmb_disable(void)
675 {
676 mmc_set_ext_csd(CMD_EXTCSD_PARTITION_CONFIG,
677 PART_CFG_BOOT_PARTITION1_ENABLE);
678 }
679
mmc_rpmb_read_blocks(int lba,uintptr_t buf,size_t size)680 size_t mmc_rpmb_read_blocks(int lba, uintptr_t buf, size_t size)
681 {
682 size_t size_read;
683
684 mmc_rpmb_enable();
685 size_read = mmc_read_blocks(lba, buf, size);
686 mmc_rpmb_disable();
687
688 return size_read;
689 }
690
mmc_rpmb_write_blocks(int lba,const uintptr_t buf,size_t size)691 size_t mmc_rpmb_write_blocks(int lba, const uintptr_t buf, size_t size)
692 {
693 size_t size_written;
694
695 mmc_rpmb_enable();
696 size_written = mmc_write_blocks(lba, buf, size);
697 mmc_rpmb_disable();
698
699 return size_written;
700 }
701
mmc_rpmb_erase_blocks(int lba,size_t size)702 size_t mmc_rpmb_erase_blocks(int lba, size_t size)
703 {
704 size_t size_erased;
705
706 mmc_rpmb_enable();
707 size_erased = mmc_erase_blocks(lba, size);
708 mmc_rpmb_disable();
709
710 return size_erased;
711 }
712
mmc_init(const struct mmc_ops * ops_ptr,unsigned int clk,unsigned int width,unsigned int flags,struct mmc_device_info * device_info)713 int mmc_init(const struct mmc_ops *ops_ptr, unsigned int clk,
714 unsigned int width, unsigned int flags,
715 struct mmc_device_info *device_info)
716 {
717 assert((ops_ptr != NULL) &&
718 (ops_ptr->init != NULL) &&
719 (ops_ptr->send_cmd != NULL) &&
720 (ops_ptr->set_ios != NULL) &&
721 (ops_ptr->prepare != NULL) &&
722 (ops_ptr->read != NULL) &&
723 (ops_ptr->write != NULL) &&
724 (device_info != NULL) &&
725 (clk != 0) &&
726 ((width == MMC_BUS_WIDTH_1) ||
727 (width == MMC_BUS_WIDTH_4) ||
728 (width == MMC_BUS_WIDTH_8) ||
729 (width == MMC_BUS_WIDTH_DDR_4) ||
730 (width == MMC_BUS_WIDTH_DDR_8)));
731
732 ops = ops_ptr;
733 mmc_flags = flags;
734 mmc_dev_info = device_info;
735
736 return mmc_enumerate(clk, width);
737 }
738