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1/*
2 * linux/drivers/mmc/core/sd.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/err.h>
14#include <linux/slab.h>
15
16#include <linux/mmc/host.h>
17#include <linux/mmc/card.h>
18#include <linux/mmc/mmc.h>
19#include <linux/mmc/sd.h>
20
21#include "core.h"
22#include "bus.h"
23#include "mmc_ops.h"
24#include "sd.h"
25#include "sd_ops.h"
26
27static const unsigned int tran_exp[] = {
28 10000, 100000, 1000000, 10000000,
29 0, 0, 0, 0
30};
31
32static const unsigned char tran_mant[] = {
33 0, 10, 12, 13, 15, 20, 25, 30,
34 35, 40, 45, 50, 55, 60, 70, 80,
35};
36
37static const unsigned int tacc_exp[] = {
38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
39};
40
41static const unsigned int tacc_mant[] = {
42 0, 10, 12, 13, 15, 20, 25, 30,
43 35, 40, 45, 50, 55, 60, 70, 80,
44};
45
46#define UNSTUFF_BITS(resp,start,size) \
47 ({ \
48 const int __size = size; \
49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
50 const int __off = 3 - ((start) / 32); \
51 const int __shft = (start) & 31; \
52 u32 __res; \
53 \
54 __res = resp[__off] >> __shft; \
55 if (__size + __shft > 32) \
56 __res |= resp[__off-1] << ((32 - __shft) % 32); \
57 __res & __mask; \
58 })
59
60/*
61 * Given the decoded CSD structure, decode the raw CID to our CID structure.
62 */
63void mmc_decode_cid(struct mmc_card *card)
64{
65 u32 *resp = card->raw_cid;
66
67 memset(&card->cid, 0, sizeof(struct mmc_cid));
68
69 /*
70 * SD doesn't currently have a version field so we will
71 * have to assume we can parse this.
72 */
73 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
74 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
75 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
76 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
77 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
78 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
79 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
80 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
81 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
82 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
83 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
84 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
85
86 card->cid.year += 2000; /* SD cards year offset */
87}
88
89/*
90 * Given a 128-bit response, decode to our card CSD structure.
91 */
92static int mmc_decode_csd(struct mmc_card *card)
93{
94 struct mmc_csd *csd = &card->csd;
95 unsigned int e, m, csd_struct;
96 u32 *resp = card->raw_csd;
97
98 csd_struct = UNSTUFF_BITS(resp, 126, 2);
99
100 switch (csd_struct) {
101 case 0:
102 m = UNSTUFF_BITS(resp, 115, 4);
103 e = UNSTUFF_BITS(resp, 112, 3);
104 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
105 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
106
107 m = UNSTUFF_BITS(resp, 99, 4);
108 e = UNSTUFF_BITS(resp, 96, 3);
109 csd->max_dtr = tran_exp[e] * tran_mant[m];
110 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
111
112 e = UNSTUFF_BITS(resp, 47, 3);
113 m = UNSTUFF_BITS(resp, 62, 12);
114 csd->capacity = (1 + m) << (e + 2);
115
116 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
117 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
118 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
119 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
120 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
121 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
122 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
123
124 if (UNSTUFF_BITS(resp, 46, 1)) {
125 csd->erase_size = 1;
126 } else if (csd->write_blkbits >= 9) {
127 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
128 csd->erase_size <<= csd->write_blkbits - 9;
129 }
130 break;
131 case 1:
132 /*
133 * This is a block-addressed SDHC or SDXC card. Most
134 * interesting fields are unused and have fixed
135 * values. To avoid getting tripped by buggy cards,
136 * we assume those fixed values ourselves.
137 */
138 mmc_card_set_blockaddr(card);
139
140 csd->tacc_ns = 0; /* Unused */
141 csd->tacc_clks = 0; /* Unused */
142
143 m = UNSTUFF_BITS(resp, 99, 4);
144 e = UNSTUFF_BITS(resp, 96, 3);
145 csd->max_dtr = tran_exp[e] * tran_mant[m];
146 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
147 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
148
149 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
150 if (csd->c_size >= 0xFFFF)
151 mmc_card_set_ext_capacity(card);
152
153 m = UNSTUFF_BITS(resp, 48, 22);
154 csd->capacity = (1 + m) << 10;
155
156 csd->read_blkbits = 9;
157 csd->read_partial = 0;
158 csd->write_misalign = 0;
159 csd->read_misalign = 0;
160 csd->r2w_factor = 4; /* Unused */
161 csd->write_blkbits = 9;
162 csd->write_partial = 0;
163 csd->erase_size = 1;
164 break;
165 default:
166 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
167 mmc_hostname(card->host), csd_struct);
168 return -EINVAL;
169 }
170
171 card->erase_size = csd->erase_size;
172
173 return 0;
174}
175
176/*
177 * Given a 64-bit response, decode to our card SCR structure.
178 */
179static int mmc_decode_scr(struct mmc_card *card)
180{
181 struct sd_scr *scr = &card->scr;
182 unsigned int scr_struct;
183 u32 resp[4];
184
185 resp[3] = card->raw_scr[1];
186 resp[2] = card->raw_scr[0];
187
188 scr_struct = UNSTUFF_BITS(resp, 60, 4);
189 if (scr_struct != 0) {
190 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
191 mmc_hostname(card->host), scr_struct);
192 return -EINVAL;
193 }
194
195 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
196 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
197 if (scr->sda_vsn == SCR_SPEC_VER_2)
198 /* Check if Physical Layer Spec v3.0 is supported */
199 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
200
201 if (UNSTUFF_BITS(resp, 55, 1))
202 card->erased_byte = 0xFF;
203 else
204 card->erased_byte = 0x0;
205
206 if (scr->sda_spec3)
207 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
208 return 0;
209}
210
211/*
212 * Fetch and process SD Status register.
213 */
214static int mmc_read_ssr(struct mmc_card *card)
215{
216 unsigned int au, es, et, eo;
217 int err, i;
218 u32 *ssr;
219
220 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
221 printk(KERN_WARNING "%s: card lacks mandatory SD Status "
222 "function.\n", mmc_hostname(card->host));
223 return 0;
224 }
225
226 ssr = kmalloc(64, GFP_KERNEL);
227 if (!ssr)
228 return -ENOMEM;
229
230 err = mmc_app_sd_status(card, ssr);
231 if (err) {
232 printk(KERN_WARNING "%s: problem reading SD Status "
233 "register.\n", mmc_hostname(card->host));
234 err = 0;
235 goto out;
236 }
237
238 for (i = 0; i < 16; i++)
239 ssr[i] = be32_to_cpu(ssr[i]);
240
241 /*
242 * UNSTUFF_BITS only works with four u32s so we have to offset the
243 * bitfield positions accordingly.
244 */
245 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
246 if (au > 0 || au <= 9) {
247 card->ssr.au = 1 << (au + 4);
248 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
249 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
250 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
251 if (es && et) {
252 card->ssr.erase_timeout = (et * 1000) / es;
253 card->ssr.erase_offset = eo * 1000;
254 }
255 } else {
256 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit "
257 "size.\n", mmc_hostname(card->host));
258 }
259out:
260 kfree(ssr);
261 return err;
262}
263
264/*
265 * Fetches and decodes switch information
266 */
267static int mmc_read_switch(struct mmc_card *card)
268{
269 int err;
270 u8 *status;
271
272 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
273 return 0;
274
275 if (!(card->csd.cmdclass & CCC_SWITCH)) {
276 printk(KERN_WARNING "%s: card lacks mandatory switch "
277 "function, performance might suffer.\n",
278 mmc_hostname(card->host));
279 return 0;
280 }
281
282 err = -EIO;
283
284 status = kmalloc(64, GFP_KERNEL);
285 if (!status) {
286 printk(KERN_ERR "%s: could not allocate a buffer for "
287 "switch capabilities.\n",
288 mmc_hostname(card->host));
289 return -ENOMEM;
290 }
291
292 /* Find out the supported Bus Speed Modes. */
293 err = mmc_sd_switch(card, 0, 0, 1, status);
294 if (err) {
295 /*
296 * If the host or the card can't do the switch,
297 * fail more gracefully.
298 */
299 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
300 goto out;
301
302 printk(KERN_WARNING "%s: problem reading Bus Speed modes.\n",
303 mmc_hostname(card->host));
304 err = 0;
305
306 goto out;
307 }
308
309 if (card->scr.sda_spec3) {
310 card->sw_caps.sd3_bus_mode = status[13];
311
312 /* Find out Driver Strengths supported by the card */
313 err = mmc_sd_switch(card, 0, 2, 1, status);
314 if (err) {
315 /*
316 * If the host or the card can't do the switch,
317 * fail more gracefully.
318 */
319 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
320 goto out;
321
322 printk(KERN_WARNING "%s: problem reading "
323 "Driver Strength.\n",
324 mmc_hostname(card->host));
325 err = 0;
326
327 goto out;
328 }
329
330 card->sw_caps.sd3_drv_type = status[9];
331
332 /* Find out Current Limits supported by the card */
333 err = mmc_sd_switch(card, 0, 3, 1, status);
334 if (err) {
335 /*
336 * If the host or the card can't do the switch,
337 * fail more gracefully.
338 */
339 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
340 goto out;
341
342 printk(KERN_WARNING "%s: problem reading "
343 "Current Limit.\n",
344 mmc_hostname(card->host));
345 err = 0;
346
347 goto out;
348 }
349
350 card->sw_caps.sd3_curr_limit = status[7];
351 } else {
352 if (status[13] & 0x02)
353 card->sw_caps.hs_max_dtr = 50000000;
354 }
355
356out:
357 kfree(status);
358
359 return err;
360}
361
362/*
363 * Test if the card supports high-speed mode and, if so, switch to it.
364 */
365int mmc_sd_switch_hs(struct mmc_card *card)
366{
367 int err;
368 u8 *status;
369
370 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
371 return 0;
372
373 if (!(card->csd.cmdclass & CCC_SWITCH))
374 return 0;
375
376 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
377 return 0;
378
379 if (card->sw_caps.hs_max_dtr == 0)
380 return 0;
381
382 err = -EIO;
383
384 status = kmalloc(64, GFP_KERNEL);
385 if (!status) {
386 printk(KERN_ERR "%s: could not allocate a buffer for "
387 "switch capabilities.\n", mmc_hostname(card->host));
388 return -ENOMEM;
389 }
390
391 err = mmc_sd_switch(card, 1, 0, 1, status);
392 if (err)
393 goto out;
394
395 if ((status[16] & 0xF) != 1) {
396 printk(KERN_WARNING "%s: Problem switching card "
397 "into high-speed mode!\n",
398 mmc_hostname(card->host));
399 err = 0;
400 } else {
401 err = 1;
402 }
403
404out:
405 kfree(status);
406
407 return err;
408}
409
410static int sd_select_driver_type(struct mmc_card *card, u8 *status)
411{
412 int host_drv_type = SD_DRIVER_TYPE_B;
413 int card_drv_type = SD_DRIVER_TYPE_B;
414 int drive_strength;
415 int err;
416
417 /*
418 * If the host doesn't support any of the Driver Types A,C or D,
419 * or there is no board specific handler then default Driver
420 * Type B is used.
421 */
422 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
423 | MMC_CAP_DRIVER_TYPE_D)))
424 return 0;
425
426 if (!card->host->ops->select_drive_strength)
427 return 0;
428
429 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
430 host_drv_type |= SD_DRIVER_TYPE_A;
431
432 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
433 host_drv_type |= SD_DRIVER_TYPE_C;
434
435 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
436 host_drv_type |= SD_DRIVER_TYPE_D;
437
438 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
439 card_drv_type |= SD_DRIVER_TYPE_A;
440
441 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
442 card_drv_type |= SD_DRIVER_TYPE_C;
443
444 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
445 card_drv_type |= SD_DRIVER_TYPE_D;
446
447 /*
448 * The drive strength that the hardware can support
449 * depends on the board design. Pass the appropriate
450 * information and let the hardware specific code
451 * return what is possible given the options
452 */
453 drive_strength = card->host->ops->select_drive_strength(
454 card->sw_caps.uhs_max_dtr,
455 host_drv_type, card_drv_type);
456
457 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
458 if (err)
459 return err;
460
461 if ((status[15] & 0xF) != drive_strength) {
462 printk(KERN_WARNING "%s: Problem setting drive strength!\n",
463 mmc_hostname(card->host));
464 return 0;
465 }
466
467 mmc_set_driver_type(card->host, drive_strength);
468
469 return 0;
470}
471
472static void sd_update_bus_speed_mode(struct mmc_card *card)
473{
474 /*
475 * If the host doesn't support any of the UHS-I modes, fallback on
476 * default speed.
477 */
478 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
479 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) {
480 card->sd_bus_speed = 0;
481 return;
482 }
483
484 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
485 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
486 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
487 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
488 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
489 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
490 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
491 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
492 SD_MODE_UHS_SDR50)) {
493 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
494 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
495 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
496 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
497 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
498 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
499 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
500 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
501 SD_MODE_UHS_SDR12)) {
502 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
503 }
504}
505
506static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
507{
508 int err;
509 unsigned int timing = 0;
510
511 switch (card->sd_bus_speed) {
512 case UHS_SDR104_BUS_SPEED:
513 timing = MMC_TIMING_UHS_SDR104;
514 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
515 break;
516 case UHS_DDR50_BUS_SPEED:
517 timing = MMC_TIMING_UHS_DDR50;
518 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
519 break;
520 case UHS_SDR50_BUS_SPEED:
521 timing = MMC_TIMING_UHS_SDR50;
522 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
523 break;
524 case UHS_SDR25_BUS_SPEED:
525 timing = MMC_TIMING_UHS_SDR25;
526 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
527 break;
528 case UHS_SDR12_BUS_SPEED:
529 timing = MMC_TIMING_UHS_SDR12;
530 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
531 break;
532 default:
533 return 0;
534 }
535
536 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
537 if (err)
538 return err;
539
540 if ((status[16] & 0xF) != card->sd_bus_speed)
541 printk(KERN_WARNING "%s: Problem setting bus speed mode!\n",
542 mmc_hostname(card->host));
543 else {
544 mmc_set_timing(card->host, timing);
545 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
546 }
547
548 return 0;
549}
550
551static int sd_set_current_limit(struct mmc_card *card, u8 *status)
552{
553 int current_limit = 0;
554 int err;
555
556 /*
557 * Current limit switch is only defined for SDR50, SDR104, and DDR50
558 * bus speed modes. For other bus speed modes, we set the default
559 * current limit of 200mA.
560 */
561 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
562 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
563 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) {
564 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
565 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
566 current_limit = SD_SET_CURRENT_LIMIT_800;
567 else if (card->sw_caps.sd3_curr_limit &
568 SD_MAX_CURRENT_600)
569 current_limit = SD_SET_CURRENT_LIMIT_600;
570 else if (card->sw_caps.sd3_curr_limit &
571 SD_MAX_CURRENT_400)
572 current_limit = SD_SET_CURRENT_LIMIT_400;
573 else if (card->sw_caps.sd3_curr_limit &
574 SD_MAX_CURRENT_200)
575 current_limit = SD_SET_CURRENT_LIMIT_200;
576 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
577 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
578 current_limit = SD_SET_CURRENT_LIMIT_600;
579 else if (card->sw_caps.sd3_curr_limit &
580 SD_MAX_CURRENT_400)
581 current_limit = SD_SET_CURRENT_LIMIT_400;
582 else if (card->sw_caps.sd3_curr_limit &
583 SD_MAX_CURRENT_200)
584 current_limit = SD_SET_CURRENT_LIMIT_200;
585 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
586 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
587 current_limit = SD_SET_CURRENT_LIMIT_400;
588 else if (card->sw_caps.sd3_curr_limit &
589 SD_MAX_CURRENT_200)
590 current_limit = SD_SET_CURRENT_LIMIT_200;
591 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
592 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
593 current_limit = SD_SET_CURRENT_LIMIT_200;
594 }
595 } else
596 current_limit = SD_SET_CURRENT_LIMIT_200;
597
598 err = mmc_sd_switch(card, 1, 3, current_limit, status);
599 if (err)
600 return err;
601
602 if (((status[15] >> 4) & 0x0F) != current_limit)
603 printk(KERN_WARNING "%s: Problem setting current limit!\n",
604 mmc_hostname(card->host));
605
606 return 0;
607}
608
609/*
610 * UHS-I specific initialization procedure
611 */
612static int mmc_sd_init_uhs_card(struct mmc_card *card)
613{
614 int err;
615 u8 *status;
616
617 if (!card->scr.sda_spec3)
618 return 0;
619
620 if (!(card->csd.cmdclass & CCC_SWITCH))
621 return 0;
622
623 status = kmalloc(64, GFP_KERNEL);
624 if (!status) {
625 printk(KERN_ERR "%s: could not allocate a buffer for "
626 "switch capabilities.\n", mmc_hostname(card->host));
627 return -ENOMEM;
628 }
629
630 /* Set 4-bit bus width */
631 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
632 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
633 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
634 if (err)
635 goto out;
636
637 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
638 }
639
640 /*
641 * Select the bus speed mode depending on host
642 * and card capability.
643 */
644 sd_update_bus_speed_mode(card);
645
646 /* Set the driver strength for the card */
647 err = sd_select_driver_type(card, status);
648 if (err)
649 goto out;
650
651 /* Set current limit for the card */
652 err = sd_set_current_limit(card, status);
653 if (err)
654 goto out;
655
656 /* Set bus speed mode of the card */
657 err = sd_set_bus_speed_mode(card, status);
658 if (err)
659 goto out;
660
661 /* SPI mode doesn't define CMD19 */
662 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
663 err = card->host->ops->execute_tuning(card->host);
664
665out:
666 kfree(status);
667
668 return err;
669}
670
671MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
672 card->raw_cid[2], card->raw_cid[3]);
673MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
674 card->raw_csd[2], card->raw_csd[3]);
675MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
676MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
677MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
678MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
679MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
680MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
681MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
682MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
683MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
684MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
685
686
687static struct attribute *sd_std_attrs[] = {
688 &dev_attr_cid.attr,
689 &dev_attr_csd.attr,
690 &dev_attr_scr.attr,
691 &dev_attr_date.attr,
692 &dev_attr_erase_size.attr,
693 &dev_attr_preferred_erase_size.attr,
694 &dev_attr_fwrev.attr,
695 &dev_attr_hwrev.attr,
696 &dev_attr_manfid.attr,
697 &dev_attr_name.attr,
698 &dev_attr_oemid.attr,
699 &dev_attr_serial.attr,
700 NULL,
701};
702
703static struct attribute_group sd_std_attr_group = {
704 .attrs = sd_std_attrs,
705};
706
707static const struct attribute_group *sd_attr_groups[] = {
708 &sd_std_attr_group,
709 NULL,
710};
711
712struct device_type sd_type = {
713 .groups = sd_attr_groups,
714};
715
716/*
717 * Fetch CID from card.
718 */
719int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
720{
721 int err;
722
723 /*
724 * Since we're changing the OCR value, we seem to
725 * need to tell some cards to go back to the idle
726 * state. We wait 1ms to give cards time to
727 * respond.
728 */
729 mmc_go_idle(host);
730
731 /*
732 * If SD_SEND_IF_COND indicates an SD 2.0
733 * compliant card and we should set bit 30
734 * of the ocr to indicate that we can handle
735 * block-addressed SDHC cards.
736 */
737 err = mmc_send_if_cond(host, ocr);
738 if (!err)
739 ocr |= SD_OCR_CCS;
740
741 /*
742 * If the host supports one of UHS-I modes, request the card
743 * to switch to 1.8V signaling level.
744 */
745 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
746 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
747 ocr |= SD_OCR_S18R;
748
749 /* If the host can supply more than 150mA, XPC should be set to 1. */
750 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 |
751 MMC_CAP_SET_XPC_180))
752 ocr |= SD_OCR_XPC;
753
754try_again:
755 err = mmc_send_app_op_cond(host, ocr, rocr);
756 if (err)
757 return err;
758
759 /*
760 * In case CCS and S18A in the response is set, start Signal Voltage
761 * Switch procedure. SPI mode doesn't support CMD11.
762 */
763 if (!mmc_host_is_spi(host) && rocr &&
764 ((*rocr & 0x41000000) == 0x41000000)) {
765 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
766 if (err) {
767 ocr &= ~SD_OCR_S18R;
768 goto try_again;
769 }
770 }
771
772 if (mmc_host_is_spi(host))
773 err = mmc_send_cid(host, cid);
774 else
775 err = mmc_all_send_cid(host, cid);
776
777 return err;
778}
779
780int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
781{
782 int err;
783
784 /*
785 * Fetch CSD from card.
786 */
787 err = mmc_send_csd(card, card->raw_csd);
788 if (err)
789 return err;
790
791 err = mmc_decode_csd(card);
792 if (err)
793 return err;
794
795 return 0;
796}
797
798int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
799 bool reinit)
800{
801 int err;
802
803 if (!reinit) {
804 /*
805 * Fetch SCR from card.
806 */
807 err = mmc_app_send_scr(card, card->raw_scr);
808 if (err)
809 return err;
810
811 err = mmc_decode_scr(card);
812 if (err)
813 return err;
814
815 /*
816 * Fetch and process SD Status register.
817 */
818 err = mmc_read_ssr(card);
819 if (err)
820 return err;
821
822 /* Erase init depends on CSD and SSR */
823 mmc_init_erase(card);
824
825 /*
826 * Fetch switch information from card.
827 */
828 err = mmc_read_switch(card);
829 if (err)
830 return err;
831 }
832
833 /*
834 * For SPI, enable CRC as appropriate.
835 * This CRC enable is located AFTER the reading of the
836 * card registers because some SDHC cards are not able
837 * to provide valid CRCs for non-512-byte blocks.
838 */
839 if (mmc_host_is_spi(host)) {
840 err = mmc_spi_set_crc(host, use_spi_crc);
841 if (err)
842 return err;
843 }
844
845 /*
846 * Check if read-only switch is active.
847 */
848 if (!reinit) {
849 int ro = -1;
850
851 if (host->ops->get_ro)
852 ro = host->ops->get_ro(host);
853
854 if (ro < 0) {
855 printk(KERN_WARNING "%s: host does not "
856 "support reading read-only "
857 "switch. assuming write-enable.\n",
858 mmc_hostname(host));
859 } else if (ro > 0) {
860 mmc_card_set_readonly(card);
861 }
862 }
863
864 return 0;
865}
866
867unsigned mmc_sd_get_max_clock(struct mmc_card *card)
868{
869 unsigned max_dtr = (unsigned int)-1;
870
871 if (mmc_card_highspeed(card)) {
872 if (max_dtr > card->sw_caps.hs_max_dtr)
873 max_dtr = card->sw_caps.hs_max_dtr;
874 } else if (max_dtr > card->csd.max_dtr) {
875 max_dtr = card->csd.max_dtr;
876 }
877
878 return max_dtr;
879}
880
881void mmc_sd_go_highspeed(struct mmc_card *card)
882{
883 mmc_card_set_highspeed(card);
884 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
885}
886
887/*
888 * Handle the detection and initialisation of a card.
889 *
890 * In the case of a resume, "oldcard" will contain the card
891 * we're trying to reinitialise.
892 */
893static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
894 struct mmc_card *oldcard)
895{
896 struct mmc_card *card;
897 int err;
898 u32 cid[4];
899 u32 rocr = 0;
900
901 BUG_ON(!host);
902 WARN_ON(!host->claimed);
903
904 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
905 if (err)
906 return err;
907
908 if (oldcard) {
909 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
910 return -ENOENT;
911
912 card = oldcard;
913 } else {
914 /*
915 * Allocate card structure.
916 */
917 card = mmc_alloc_card(host, &sd_type);
918 if (IS_ERR(card))
919 return PTR_ERR(card);
920
921 card->type = MMC_TYPE_SD;
922 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
923 }
924
925 /*
926 * For native busses: get card RCA and quit open drain mode.
927 */
928 if (!mmc_host_is_spi(host)) {
929 err = mmc_send_relative_addr(host, &card->rca);
930 if (err)
931 return err;
932
933 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
934 }
935
936 if (!oldcard) {
937 err = mmc_sd_get_csd(host, card);
938 if (err)
939 return err;
940
941 mmc_decode_cid(card);
942 }
943
944 /*
945 * Select card, as all following commands rely on that.
946 */
947 if (!mmc_host_is_spi(host)) {
948 err = mmc_select_card(card);
949 if (err)
950 return err;
951 }
952
953 err = mmc_sd_setup_card(host, card, oldcard != NULL);
954 if (err)
955 goto free_card;
956
957 /* Initialization sequence for UHS-I cards */
958 if (rocr & SD_ROCR_S18A) {
959 err = mmc_sd_init_uhs_card(card);
960 if (err)
961 goto free_card;
962
963 /* Card is an ultra-high-speed card */
964 mmc_sd_card_set_uhs(card);
965
966 /*
967 * Since initialization is now complete, enable preset
968 * value registers for UHS-I cards.
969 */
970 if (host->ops->enable_preset_value)
971 host->ops->enable_preset_value(host, true);
972 } else {
973 /*
974 * Attempt to change to high-speed (if supported)
975 */
976 err = mmc_sd_switch_hs(card);
977 if (err > 0)
978 mmc_sd_go_highspeed(card);
979 else if (err)
980 goto free_card;
981
982 /*
983 * Set bus speed.
984 */
985 mmc_set_clock(host, mmc_sd_get_max_clock(card));
986
987 /*
988 * Switch to wider bus (if supported).
989 */
990 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
991 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
992 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
993 if (err)
994 goto free_card;
995
996 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
997 }
998 }
999
1000 host->card = card;
1001 return 0;
1002
1003free_card:
1004 if (!oldcard)
1005 mmc_remove_card(card);
1006
1007 return err;
1008}
1009
1010/*
1011 * Host is being removed. Free up the current card.
1012 */
1013static void mmc_sd_remove(struct mmc_host *host)
1014{
1015 BUG_ON(!host);
1016 BUG_ON(!host->card);
1017
1018 mmc_remove_card(host->card);
1019 host->card = NULL;
1020}
1021
1022/*
1023 * Card detection callback from host.
1024 */
1025static void mmc_sd_detect(struct mmc_host *host)
1026{
1027 int err;
1028
1029 BUG_ON(!host);
1030 BUG_ON(!host->card);
1031
1032 mmc_claim_host(host);
1033
1034 /*
1035 * Just check if our card has been removed.
1036 */
1037 err = mmc_send_status(host->card, NULL);
1038
1039 mmc_release_host(host);
1040
1041 if (err) {
1042 mmc_sd_remove(host);
1043
1044 mmc_claim_host(host);
1045 mmc_detach_bus(host);
1046 mmc_release_host(host);
1047 }
1048}
1049
1050/*
1051 * Suspend callback from host.
1052 */
1053static int mmc_sd_suspend(struct mmc_host *host)
1054{
1055 BUG_ON(!host);
1056 BUG_ON(!host->card);
1057
1058 mmc_claim_host(host);
1059 if (!mmc_host_is_spi(host))
1060 mmc_deselect_cards(host);
1061 host->card->state &= ~MMC_STATE_HIGHSPEED;
1062 mmc_release_host(host);
1063
1064 return 0;
1065}
1066
1067/*
1068 * Resume callback from host.
1069 *
1070 * This function tries to determine if the same card is still present
1071 * and, if so, restore all state to it.
1072 */
1073static int mmc_sd_resume(struct mmc_host *host)
1074{
1075 int err;
1076
1077 BUG_ON(!host);
1078 BUG_ON(!host->card);
1079
1080 mmc_claim_host(host);
1081 err = mmc_sd_init_card(host, host->ocr, host->card);
1082 mmc_release_host(host);
1083
1084 return err;
1085}
1086
1087static int mmc_sd_power_restore(struct mmc_host *host)
1088{
1089 int ret;
1090
1091 host->card->state &= ~MMC_STATE_HIGHSPEED;
1092 mmc_claim_host(host);
1093 ret = mmc_sd_init_card(host, host->ocr, host->card);
1094 mmc_release_host(host);
1095
1096 return ret;
1097}
1098
1099static const struct mmc_bus_ops mmc_sd_ops = {
1100 .remove = mmc_sd_remove,
1101 .detect = mmc_sd_detect,
1102 .suspend = NULL,
1103 .resume = NULL,
1104 .power_restore = mmc_sd_power_restore,
1105};
1106
1107static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1108 .remove = mmc_sd_remove,
1109 .detect = mmc_sd_detect,
1110 .suspend = mmc_sd_suspend,
1111 .resume = mmc_sd_resume,
1112 .power_restore = mmc_sd_power_restore,
1113};
1114
1115static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1116{
1117 const struct mmc_bus_ops *bus_ops;
1118
1119 if (!mmc_card_is_removable(host))
1120 bus_ops = &mmc_sd_ops_unsafe;
1121 else
1122 bus_ops = &mmc_sd_ops;
1123 mmc_attach_bus(host, bus_ops);
1124}
1125
1126/*
1127 * Starting point for SD card init.
1128 */
1129int mmc_attach_sd(struct mmc_host *host)
1130{
1131 int err;
1132 u32 ocr;
1133
1134 BUG_ON(!host);
1135 WARN_ON(!host->claimed);
1136
1137 /* Make sure we are at 3.3V signalling voltage */
1138 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
1139 if (err)
1140 return err;
1141
1142 /* Disable preset value enable if already set since last time */
1143 if (host->ops->enable_preset_value)
1144 host->ops->enable_preset_value(host, false);
1145
1146 err = mmc_send_app_op_cond(host, 0, &ocr);
1147 if (err)
1148 return err;
1149
1150 mmc_sd_attach_bus_ops(host);
1151 if (host->ocr_avail_sd)
1152 host->ocr_avail = host->ocr_avail_sd;
1153
1154 /*
1155 * We need to get OCR a different way for SPI.
1156 */
1157 if (mmc_host_is_spi(host)) {
1158 mmc_go_idle(host);
1159
1160 err = mmc_spi_read_ocr(host, 0, &ocr);
1161 if (err)
1162 goto err;
1163 }
1164
1165 /*
1166 * Sanity check the voltages that the card claims to
1167 * support.
1168 */
1169 if (ocr & 0x7F) {
1170 printk(KERN_WARNING "%s: card claims to support voltages "
1171 "below the defined range. These will be ignored.\n",
1172 mmc_hostname(host));
1173 ocr &= ~0x7F;
1174 }
1175
1176 if ((ocr & MMC_VDD_165_195) &&
1177 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1178 printk(KERN_WARNING "%s: SD card claims to support the "
1179 "incompletely defined 'low voltage range'. This "
1180 "will be ignored.\n", mmc_hostname(host));
1181 ocr &= ~MMC_VDD_165_195;
1182 }
1183
1184 host->ocr = mmc_select_voltage(host, ocr);
1185
1186 /*
1187 * Can we support the voltage(s) of the card(s)?
1188 */
1189 if (!host->ocr) {
1190 err = -EINVAL;
1191 goto err;
1192 }
1193
1194 /*
1195 * Detect and init the card.
1196 */
1197 err = mmc_sd_init_card(host, host->ocr, NULL);
1198 if (err)
1199 goto err;
1200
1201 mmc_release_host(host);
1202 err = mmc_add_card(host->card);
1203 mmc_claim_host(host);
1204 if (err)
1205 goto remove_card;
1206
1207 return 0;
1208
1209remove_card:
1210 mmc_release_host(host);
1211 mmc_remove_card(host->card);
1212 host->card = NULL;
1213 mmc_claim_host(host);
1214err:
1215 mmc_detach_bus(host);
1216
1217 printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
1218 mmc_hostname(host), err);
1219
1220 return err;
1221}
1222
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/mmc/core/sd.c
4 *
5 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
6 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
7 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
8 */
9
10#include <linux/err.h>
11#include <linux/sizes.h>
12#include <linux/slab.h>
13#include <linux/stat.h>
14#include <linux/pm_runtime.h>
15
16#include <linux/mmc/host.h>
17#include <linux/mmc/card.h>
18#include <linux/mmc/mmc.h>
19#include <linux/mmc/sd.h>
20
21#include "core.h"
22#include "card.h"
23#include "host.h"
24#include "bus.h"
25#include "mmc_ops.h"
26#include "sd.h"
27#include "sd_ops.h"
28
29static const unsigned int tran_exp[] = {
30 10000, 100000, 1000000, 10000000,
31 0, 0, 0, 0
32};
33
34static const unsigned char tran_mant[] = {
35 0, 10, 12, 13, 15, 20, 25, 30,
36 35, 40, 45, 50, 55, 60, 70, 80,
37};
38
39static const unsigned int taac_exp[] = {
40 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
41};
42
43static const unsigned int taac_mant[] = {
44 0, 10, 12, 13, 15, 20, 25, 30,
45 35, 40, 45, 50, 55, 60, 70, 80,
46};
47
48static const unsigned int sd_au_size[] = {
49 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
50 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
51 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
52 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
53};
54
55#define UNSTUFF_BITS(resp,start,size) \
56 ({ \
57 const int __size = size; \
58 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
59 const int __off = 3 - ((start) / 32); \
60 const int __shft = (start) & 31; \
61 u32 __res; \
62 \
63 __res = resp[__off] >> __shft; \
64 if (__size + __shft > 32) \
65 __res |= resp[__off-1] << ((32 - __shft) % 32); \
66 __res & __mask; \
67 })
68
69/*
70 * Given the decoded CSD structure, decode the raw CID to our CID structure.
71 */
72void mmc_decode_cid(struct mmc_card *card)
73{
74 u32 *resp = card->raw_cid;
75
76 /*
77 * SD doesn't currently have a version field so we will
78 * have to assume we can parse this.
79 */
80 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
81 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
82 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
83 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
84 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
85 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
86 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
87 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
88 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
89 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
90 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
91 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
92
93 card->cid.year += 2000; /* SD cards year offset */
94}
95
96/*
97 * Given a 128-bit response, decode to our card CSD structure.
98 */
99static int mmc_decode_csd(struct mmc_card *card)
100{
101 struct mmc_csd *csd = &card->csd;
102 unsigned int e, m, csd_struct;
103 u32 *resp = card->raw_csd;
104
105 csd_struct = UNSTUFF_BITS(resp, 126, 2);
106
107 switch (csd_struct) {
108 case 0:
109 m = UNSTUFF_BITS(resp, 115, 4);
110 e = UNSTUFF_BITS(resp, 112, 3);
111 csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10;
112 csd->taac_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
113
114 m = UNSTUFF_BITS(resp, 99, 4);
115 e = UNSTUFF_BITS(resp, 96, 3);
116 csd->max_dtr = tran_exp[e] * tran_mant[m];
117 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
118
119 e = UNSTUFF_BITS(resp, 47, 3);
120 m = UNSTUFF_BITS(resp, 62, 12);
121 csd->capacity = (1 + m) << (e + 2);
122
123 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
124 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
125 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
126 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
127 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
128 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
129 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
130 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
131
132 if (UNSTUFF_BITS(resp, 46, 1)) {
133 csd->erase_size = 1;
134 } else if (csd->write_blkbits >= 9) {
135 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
136 csd->erase_size <<= csd->write_blkbits - 9;
137 }
138 break;
139 case 1:
140 /*
141 * This is a block-addressed SDHC or SDXC card. Most
142 * interesting fields are unused and have fixed
143 * values. To avoid getting tripped by buggy cards,
144 * we assume those fixed values ourselves.
145 */
146 mmc_card_set_blockaddr(card);
147
148 csd->taac_ns = 0; /* Unused */
149 csd->taac_clks = 0; /* Unused */
150
151 m = UNSTUFF_BITS(resp, 99, 4);
152 e = UNSTUFF_BITS(resp, 96, 3);
153 csd->max_dtr = tran_exp[e] * tran_mant[m];
154 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
155 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
156
157 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
158 if (csd->c_size >= 0xFFFF)
159 mmc_card_set_ext_capacity(card);
160
161 m = UNSTUFF_BITS(resp, 48, 22);
162 csd->capacity = (1 + m) << 10;
163
164 csd->read_blkbits = 9;
165 csd->read_partial = 0;
166 csd->write_misalign = 0;
167 csd->read_misalign = 0;
168 csd->r2w_factor = 4; /* Unused */
169 csd->write_blkbits = 9;
170 csd->write_partial = 0;
171 csd->erase_size = 1;
172 break;
173 default:
174 pr_err("%s: unrecognised CSD structure version %d\n",
175 mmc_hostname(card->host), csd_struct);
176 return -EINVAL;
177 }
178
179 card->erase_size = csd->erase_size;
180
181 return 0;
182}
183
184/*
185 * Given a 64-bit response, decode to our card SCR structure.
186 */
187static int mmc_decode_scr(struct mmc_card *card)
188{
189 struct sd_scr *scr = &card->scr;
190 unsigned int scr_struct;
191 u32 resp[4];
192
193 resp[3] = card->raw_scr[1];
194 resp[2] = card->raw_scr[0];
195
196 scr_struct = UNSTUFF_BITS(resp, 60, 4);
197 if (scr_struct != 0) {
198 pr_err("%s: unrecognised SCR structure version %d\n",
199 mmc_hostname(card->host), scr_struct);
200 return -EINVAL;
201 }
202
203 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
204 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
205 if (scr->sda_vsn == SCR_SPEC_VER_2)
206 /* Check if Physical Layer Spec v3.0 is supported */
207 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
208
209 if (scr->sda_spec3) {
210 scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1);
211 scr->sda_specx = UNSTUFF_BITS(resp, 38, 4);
212 }
213
214 if (UNSTUFF_BITS(resp, 55, 1))
215 card->erased_byte = 0xFF;
216 else
217 card->erased_byte = 0x0;
218
219 if (scr->sda_spec3)
220 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
221
222 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */
223 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
224 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
225 pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
226 return -EINVAL;
227 }
228
229 return 0;
230}
231
232/*
233 * Fetch and process SD Status register.
234 */
235static int mmc_read_ssr(struct mmc_card *card)
236{
237 unsigned int au, es, et, eo;
238 __be32 *raw_ssr;
239 u32 resp[4] = {};
240 u8 discard_support;
241 int i;
242
243 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
244 pr_warn("%s: card lacks mandatory SD Status function\n",
245 mmc_hostname(card->host));
246 return 0;
247 }
248
249 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
250 if (!raw_ssr)
251 return -ENOMEM;
252
253 if (mmc_app_sd_status(card, raw_ssr)) {
254 pr_warn("%s: problem reading SD Status register\n",
255 mmc_hostname(card->host));
256 kfree(raw_ssr);
257 return 0;
258 }
259
260 for (i = 0; i < 16; i++)
261 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
262
263 kfree(raw_ssr);
264
265 /*
266 * UNSTUFF_BITS only works with four u32s so we have to offset the
267 * bitfield positions accordingly.
268 */
269 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
270 if (au) {
271 if (au <= 9 || card->scr.sda_spec3) {
272 card->ssr.au = sd_au_size[au];
273 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
274 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
275 if (es && et) {
276 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
277 card->ssr.erase_timeout = (et * 1000) / es;
278 card->ssr.erase_offset = eo * 1000;
279 }
280 } else {
281 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
282 mmc_hostname(card->host));
283 }
284 }
285
286 /*
287 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set
288 */
289 resp[3] = card->raw_ssr[6];
290 discard_support = UNSTUFF_BITS(resp, 313 - 288, 1);
291 card->erase_arg = (card->scr.sda_specx && discard_support) ?
292 SD_DISCARD_ARG : SD_ERASE_ARG;
293
294 return 0;
295}
296
297/*
298 * Fetches and decodes switch information
299 */
300static int mmc_read_switch(struct mmc_card *card)
301{
302 int err;
303 u8 *status;
304
305 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
306 return 0;
307
308 if (!(card->csd.cmdclass & CCC_SWITCH)) {
309 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
310 mmc_hostname(card->host));
311 return 0;
312 }
313
314 status = kmalloc(64, GFP_KERNEL);
315 if (!status)
316 return -ENOMEM;
317
318 /*
319 * Find out the card's support bits with a mode 0 operation.
320 * The argument does not matter, as the support bits do not
321 * change with the arguments.
322 */
323 err = mmc_sd_switch(card, 0, 0, 0, status);
324 if (err) {
325 /*
326 * If the host or the card can't do the switch,
327 * fail more gracefully.
328 */
329 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
330 goto out;
331
332 pr_warn("%s: problem reading Bus Speed modes\n",
333 mmc_hostname(card->host));
334 err = 0;
335
336 goto out;
337 }
338
339 if (status[13] & SD_MODE_HIGH_SPEED)
340 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
341
342 if (card->scr.sda_spec3) {
343 card->sw_caps.sd3_bus_mode = status[13];
344 /* Driver Strengths supported by the card */
345 card->sw_caps.sd3_drv_type = status[9];
346 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
347 }
348
349out:
350 kfree(status);
351
352 return err;
353}
354
355/*
356 * Test if the card supports high-speed mode and, if so, switch to it.
357 */
358int mmc_sd_switch_hs(struct mmc_card *card)
359{
360 int err;
361 u8 *status;
362
363 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
364 return 0;
365
366 if (!(card->csd.cmdclass & CCC_SWITCH))
367 return 0;
368
369 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
370 return 0;
371
372 if (card->sw_caps.hs_max_dtr == 0)
373 return 0;
374
375 status = kmalloc(64, GFP_KERNEL);
376 if (!status)
377 return -ENOMEM;
378
379 err = mmc_sd_switch(card, 1, 0, 1, status);
380 if (err)
381 goto out;
382
383 if ((status[16] & 0xF) != 1) {
384 pr_warn("%s: Problem switching card into high-speed mode!\n",
385 mmc_hostname(card->host));
386 err = 0;
387 } else {
388 err = 1;
389 }
390
391out:
392 kfree(status);
393
394 return err;
395}
396
397static int sd_select_driver_type(struct mmc_card *card, u8 *status)
398{
399 int card_drv_type, drive_strength, drv_type;
400 int err;
401
402 card->drive_strength = 0;
403
404 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
405
406 drive_strength = mmc_select_drive_strength(card,
407 card->sw_caps.uhs_max_dtr,
408 card_drv_type, &drv_type);
409
410 if (drive_strength) {
411 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
412 if (err)
413 return err;
414 if ((status[15] & 0xF) != drive_strength) {
415 pr_warn("%s: Problem setting drive strength!\n",
416 mmc_hostname(card->host));
417 return 0;
418 }
419 card->drive_strength = drive_strength;
420 }
421
422 if (drv_type)
423 mmc_set_driver_type(card->host, drv_type);
424
425 return 0;
426}
427
428static void sd_update_bus_speed_mode(struct mmc_card *card)
429{
430 /*
431 * If the host doesn't support any of the UHS-I modes, fallback on
432 * default speed.
433 */
434 if (!mmc_host_uhs(card->host)) {
435 card->sd_bus_speed = 0;
436 return;
437 }
438
439 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
440 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
441 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
442 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
443 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
444 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
445 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
446 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
447 SD_MODE_UHS_SDR50)) {
448 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
449 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
450 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
451 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
452 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
453 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
454 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
455 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
456 SD_MODE_UHS_SDR12)) {
457 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
458 }
459}
460
461static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
462{
463 int err;
464 unsigned int timing = 0;
465
466 switch (card->sd_bus_speed) {
467 case UHS_SDR104_BUS_SPEED:
468 timing = MMC_TIMING_UHS_SDR104;
469 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
470 break;
471 case UHS_DDR50_BUS_SPEED:
472 timing = MMC_TIMING_UHS_DDR50;
473 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
474 break;
475 case UHS_SDR50_BUS_SPEED:
476 timing = MMC_TIMING_UHS_SDR50;
477 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
478 break;
479 case UHS_SDR25_BUS_SPEED:
480 timing = MMC_TIMING_UHS_SDR25;
481 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
482 break;
483 case UHS_SDR12_BUS_SPEED:
484 timing = MMC_TIMING_UHS_SDR12;
485 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
486 break;
487 default:
488 return 0;
489 }
490
491 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
492 if (err)
493 return err;
494
495 if ((status[16] & 0xF) != card->sd_bus_speed)
496 pr_warn("%s: Problem setting bus speed mode!\n",
497 mmc_hostname(card->host));
498 else {
499 mmc_set_timing(card->host, timing);
500 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
501 }
502
503 return 0;
504}
505
506/* Get host's max current setting at its current voltage */
507static u32 sd_get_host_max_current(struct mmc_host *host)
508{
509 u32 voltage, max_current;
510
511 voltage = 1 << host->ios.vdd;
512 switch (voltage) {
513 case MMC_VDD_165_195:
514 max_current = host->max_current_180;
515 break;
516 case MMC_VDD_29_30:
517 case MMC_VDD_30_31:
518 max_current = host->max_current_300;
519 break;
520 case MMC_VDD_32_33:
521 case MMC_VDD_33_34:
522 max_current = host->max_current_330;
523 break;
524 default:
525 max_current = 0;
526 }
527
528 return max_current;
529}
530
531static int sd_set_current_limit(struct mmc_card *card, u8 *status)
532{
533 int current_limit = SD_SET_CURRENT_NO_CHANGE;
534 int err;
535 u32 max_current;
536
537 /*
538 * Current limit switch is only defined for SDR50, SDR104, and DDR50
539 * bus speed modes. For other bus speed modes, we do not change the
540 * current limit.
541 */
542 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
543 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
544 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
545 return 0;
546
547 /*
548 * Host has different current capabilities when operating at
549 * different voltages, so find out its max current first.
550 */
551 max_current = sd_get_host_max_current(card->host);
552
553 /*
554 * We only check host's capability here, if we set a limit that is
555 * higher than the card's maximum current, the card will be using its
556 * maximum current, e.g. if the card's maximum current is 300ma, and
557 * when we set current limit to 200ma, the card will draw 200ma, and
558 * when we set current limit to 400/600/800ma, the card will draw its
559 * maximum 300ma from the host.
560 *
561 * The above is incorrect: if we try to set a current limit that is
562 * not supported by the card, the card can rightfully error out the
563 * attempt, and remain at the default current limit. This results
564 * in a 300mA card being limited to 200mA even though the host
565 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
566 * an iMX6 host. --rmk
567 */
568 if (max_current >= 800 &&
569 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
570 current_limit = SD_SET_CURRENT_LIMIT_800;
571 else if (max_current >= 600 &&
572 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
573 current_limit = SD_SET_CURRENT_LIMIT_600;
574 else if (max_current >= 400 &&
575 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
576 current_limit = SD_SET_CURRENT_LIMIT_400;
577 else if (max_current >= 200 &&
578 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
579 current_limit = SD_SET_CURRENT_LIMIT_200;
580
581 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
582 err = mmc_sd_switch(card, 1, 3, current_limit, status);
583 if (err)
584 return err;
585
586 if (((status[15] >> 4) & 0x0F) != current_limit)
587 pr_warn("%s: Problem setting current limit!\n",
588 mmc_hostname(card->host));
589
590 }
591
592 return 0;
593}
594
595/*
596 * UHS-I specific initialization procedure
597 */
598static int mmc_sd_init_uhs_card(struct mmc_card *card)
599{
600 int err;
601 u8 *status;
602
603 if (!(card->csd.cmdclass & CCC_SWITCH))
604 return 0;
605
606 status = kmalloc(64, GFP_KERNEL);
607 if (!status)
608 return -ENOMEM;
609
610 /* Set 4-bit bus width */
611 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
612 if (err)
613 goto out;
614
615 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
616
617 /*
618 * Select the bus speed mode depending on host
619 * and card capability.
620 */
621 sd_update_bus_speed_mode(card);
622
623 /* Set the driver strength for the card */
624 err = sd_select_driver_type(card, status);
625 if (err)
626 goto out;
627
628 /* Set current limit for the card */
629 err = sd_set_current_limit(card, status);
630 if (err)
631 goto out;
632
633 /* Set bus speed mode of the card */
634 err = sd_set_bus_speed_mode(card, status);
635 if (err)
636 goto out;
637
638 /*
639 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
640 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
641 */
642 if (!mmc_host_is_spi(card->host) &&
643 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
644 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
645 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
646 err = mmc_execute_tuning(card);
647
648 /*
649 * As SD Specifications Part1 Physical Layer Specification
650 * Version 3.01 says, CMD19 tuning is available for unlocked
651 * cards in transfer state of 1.8V signaling mode. The small
652 * difference between v3.00 and 3.01 spec means that CMD19
653 * tuning is also available for DDR50 mode.
654 */
655 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
656 pr_warn("%s: ddr50 tuning failed\n",
657 mmc_hostname(card->host));
658 err = 0;
659 }
660 }
661
662out:
663 kfree(status);
664
665 return err;
666}
667
668MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
669 card->raw_cid[2], card->raw_cid[3]);
670MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
671 card->raw_csd[2], card->raw_csd[3]);
672MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
673MMC_DEV_ATTR(ssr,
674 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
675 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
676 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
677 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
678 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
679 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
680 card->raw_ssr[15]);
681MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
682MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
683MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
684MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
685MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
686MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
687MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
688MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
689MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
690MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
691MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
692
693
694static ssize_t mmc_dsr_show(struct device *dev,
695 struct device_attribute *attr,
696 char *buf)
697{
698 struct mmc_card *card = mmc_dev_to_card(dev);
699 struct mmc_host *host = card->host;
700
701 if (card->csd.dsr_imp && host->dsr_req)
702 return sprintf(buf, "0x%x\n", host->dsr);
703 else
704 /* return default DSR value */
705 return sprintf(buf, "0x%x\n", 0x404);
706}
707
708static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
709
710static struct attribute *sd_std_attrs[] = {
711 &dev_attr_cid.attr,
712 &dev_attr_csd.attr,
713 &dev_attr_scr.attr,
714 &dev_attr_ssr.attr,
715 &dev_attr_date.attr,
716 &dev_attr_erase_size.attr,
717 &dev_attr_preferred_erase_size.attr,
718 &dev_attr_fwrev.attr,
719 &dev_attr_hwrev.attr,
720 &dev_attr_manfid.attr,
721 &dev_attr_name.attr,
722 &dev_attr_oemid.attr,
723 &dev_attr_serial.attr,
724 &dev_attr_ocr.attr,
725 &dev_attr_rca.attr,
726 &dev_attr_dsr.attr,
727 NULL,
728};
729ATTRIBUTE_GROUPS(sd_std);
730
731struct device_type sd_type = {
732 .groups = sd_std_groups,
733};
734
735/*
736 * Fetch CID from card.
737 */
738int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
739{
740 int err;
741 u32 max_current;
742 int retries = 10;
743 u32 pocr = ocr;
744
745try_again:
746 if (!retries) {
747 ocr &= ~SD_OCR_S18R;
748 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
749 }
750
751 /*
752 * Since we're changing the OCR value, we seem to
753 * need to tell some cards to go back to the idle
754 * state. We wait 1ms to give cards time to
755 * respond.
756 */
757 mmc_go_idle(host);
758
759 /*
760 * If SD_SEND_IF_COND indicates an SD 2.0
761 * compliant card and we should set bit 30
762 * of the ocr to indicate that we can handle
763 * block-addressed SDHC cards.
764 */
765 err = mmc_send_if_cond(host, ocr);
766 if (!err)
767 ocr |= SD_OCR_CCS;
768
769 /*
770 * If the host supports one of UHS-I modes, request the card
771 * to switch to 1.8V signaling level. If the card has failed
772 * repeatedly to switch however, skip this.
773 */
774 if (retries && mmc_host_uhs(host))
775 ocr |= SD_OCR_S18R;
776
777 /*
778 * If the host can supply more than 150mA at current voltage,
779 * XPC should be set to 1.
780 */
781 max_current = sd_get_host_max_current(host);
782 if (max_current > 150)
783 ocr |= SD_OCR_XPC;
784
785 err = mmc_send_app_op_cond(host, ocr, rocr);
786 if (err)
787 return err;
788
789 /*
790 * In case CCS and S18A in the response is set, start Signal Voltage
791 * Switch procedure. SPI mode doesn't support CMD11.
792 */
793 if (!mmc_host_is_spi(host) && rocr &&
794 ((*rocr & 0x41000000) == 0x41000000)) {
795 err = mmc_set_uhs_voltage(host, pocr);
796 if (err == -EAGAIN) {
797 retries--;
798 goto try_again;
799 } else if (err) {
800 retries = 0;
801 goto try_again;
802 }
803 }
804
805 err = mmc_send_cid(host, cid);
806 return err;
807}
808
809int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
810{
811 int err;
812
813 /*
814 * Fetch CSD from card.
815 */
816 err = mmc_send_csd(card, card->raw_csd);
817 if (err)
818 return err;
819
820 err = mmc_decode_csd(card);
821 if (err)
822 return err;
823
824 return 0;
825}
826
827static int mmc_sd_get_ro(struct mmc_host *host)
828{
829 int ro;
830
831 /*
832 * Some systems don't feature a write-protect pin and don't need one.
833 * E.g. because they only have micro-SD card slot. For those systems
834 * assume that the SD card is always read-write.
835 */
836 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
837 return 0;
838
839 if (!host->ops->get_ro)
840 return -1;
841
842 ro = host->ops->get_ro(host);
843
844 return ro;
845}
846
847int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
848 bool reinit)
849{
850 int err;
851
852 if (!reinit) {
853 /*
854 * Fetch SCR from card.
855 */
856 err = mmc_app_send_scr(card);
857 if (err)
858 return err;
859
860 err = mmc_decode_scr(card);
861 if (err)
862 return err;
863
864 /*
865 * Fetch and process SD Status register.
866 */
867 err = mmc_read_ssr(card);
868 if (err)
869 return err;
870
871 /* Erase init depends on CSD and SSR */
872 mmc_init_erase(card);
873
874 /*
875 * Fetch switch information from card.
876 */
877 err = mmc_read_switch(card);
878 if (err)
879 return err;
880 }
881
882 /*
883 * For SPI, enable CRC as appropriate.
884 * This CRC enable is located AFTER the reading of the
885 * card registers because some SDHC cards are not able
886 * to provide valid CRCs for non-512-byte blocks.
887 */
888 if (mmc_host_is_spi(host)) {
889 err = mmc_spi_set_crc(host, use_spi_crc);
890 if (err)
891 return err;
892 }
893
894 /*
895 * Check if read-only switch is active.
896 */
897 if (!reinit) {
898 int ro = mmc_sd_get_ro(host);
899
900 if (ro < 0) {
901 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
902 mmc_hostname(host));
903 } else if (ro > 0) {
904 mmc_card_set_readonly(card);
905 }
906 }
907
908 return 0;
909}
910
911unsigned mmc_sd_get_max_clock(struct mmc_card *card)
912{
913 unsigned max_dtr = (unsigned int)-1;
914
915 if (mmc_card_hs(card)) {
916 if (max_dtr > card->sw_caps.hs_max_dtr)
917 max_dtr = card->sw_caps.hs_max_dtr;
918 } else if (max_dtr > card->csd.max_dtr) {
919 max_dtr = card->csd.max_dtr;
920 }
921
922 return max_dtr;
923}
924
925static bool mmc_sd_card_using_v18(struct mmc_card *card)
926{
927 /*
928 * According to the SD spec., the Bus Speed Mode (function group 1) bits
929 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus
930 * they can be used to determine if the card has already switched to
931 * 1.8V signaling.
932 */
933 return card->sw_caps.sd3_bus_mode &
934 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50);
935}
936
937/*
938 * Handle the detection and initialisation of a card.
939 *
940 * In the case of a resume, "oldcard" will contain the card
941 * we're trying to reinitialise.
942 */
943static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
944 struct mmc_card *oldcard)
945{
946 struct mmc_card *card;
947 int err;
948 u32 cid[4];
949 u32 rocr = 0;
950 bool v18_fixup_failed = false;
951
952 WARN_ON(!host->claimed);
953retry:
954 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
955 if (err)
956 return err;
957
958 if (oldcard) {
959 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
960 pr_debug("%s: Perhaps the card was replaced\n",
961 mmc_hostname(host));
962 return -ENOENT;
963 }
964
965 card = oldcard;
966 } else {
967 /*
968 * Allocate card structure.
969 */
970 card = mmc_alloc_card(host, &sd_type);
971 if (IS_ERR(card))
972 return PTR_ERR(card);
973
974 card->ocr = ocr;
975 card->type = MMC_TYPE_SD;
976 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
977 }
978
979 /*
980 * Call the optional HC's init_card function to handle quirks.
981 */
982 if (host->ops->init_card)
983 host->ops->init_card(host, card);
984
985 /*
986 * For native busses: get card RCA and quit open drain mode.
987 */
988 if (!mmc_host_is_spi(host)) {
989 err = mmc_send_relative_addr(host, &card->rca);
990 if (err)
991 goto free_card;
992 }
993
994 if (!oldcard) {
995 err = mmc_sd_get_csd(host, card);
996 if (err)
997 goto free_card;
998
999 mmc_decode_cid(card);
1000 }
1001
1002 /*
1003 * handling only for cards supporting DSR and hosts requesting
1004 * DSR configuration
1005 */
1006 if (card->csd.dsr_imp && host->dsr_req)
1007 mmc_set_dsr(host);
1008
1009 /*
1010 * Select card, as all following commands rely on that.
1011 */
1012 if (!mmc_host_is_spi(host)) {
1013 err = mmc_select_card(card);
1014 if (err)
1015 goto free_card;
1016 }
1017
1018 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1019 if (err)
1020 goto free_card;
1021
1022 /*
1023 * If the card has not been power cycled, it may still be using 1.8V
1024 * signaling. Detect that situation and try to initialize a UHS-I (1.8V)
1025 * transfer mode.
1026 */
1027 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
1028 mmc_sd_card_using_v18(card) &&
1029 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
1030 /*
1031 * Re-read switch information in case it has changed since
1032 * oldcard was initialized.
1033 */
1034 if (oldcard) {
1035 err = mmc_read_switch(card);
1036 if (err)
1037 goto free_card;
1038 }
1039 if (mmc_sd_card_using_v18(card)) {
1040 if (mmc_host_set_uhs_voltage(host) ||
1041 mmc_sd_init_uhs_card(card)) {
1042 v18_fixup_failed = true;
1043 mmc_power_cycle(host, ocr);
1044 if (!oldcard)
1045 mmc_remove_card(card);
1046 goto retry;
1047 }
1048 goto done;
1049 }
1050 }
1051
1052 /* Initialization sequence for UHS-I cards */
1053 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {
1054 err = mmc_sd_init_uhs_card(card);
1055 if (err)
1056 goto free_card;
1057 } else {
1058 /*
1059 * Attempt to change to high-speed (if supported)
1060 */
1061 err = mmc_sd_switch_hs(card);
1062 if (err > 0)
1063 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1064 else if (err)
1065 goto free_card;
1066
1067 /*
1068 * Set bus speed.
1069 */
1070 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1071
1072 /*
1073 * Switch to wider bus (if supported).
1074 */
1075 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1076 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1077 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1078 if (err)
1079 goto free_card;
1080
1081 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1082 }
1083 }
1084
1085 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1086 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1087 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1088 mmc_hostname(host));
1089 err = -EINVAL;
1090 goto free_card;
1091 }
1092done:
1093 host->card = card;
1094 return 0;
1095
1096free_card:
1097 if (!oldcard)
1098 mmc_remove_card(card);
1099
1100 return err;
1101}
1102
1103/*
1104 * Host is being removed. Free up the current card.
1105 */
1106static void mmc_sd_remove(struct mmc_host *host)
1107{
1108 mmc_remove_card(host->card);
1109 host->card = NULL;
1110}
1111
1112/*
1113 * Card detection - card is alive.
1114 */
1115static int mmc_sd_alive(struct mmc_host *host)
1116{
1117 return mmc_send_status(host->card, NULL);
1118}
1119
1120/*
1121 * Card detection callback from host.
1122 */
1123static void mmc_sd_detect(struct mmc_host *host)
1124{
1125 int err;
1126
1127 mmc_get_card(host->card, NULL);
1128
1129 /*
1130 * Just check if our card has been removed.
1131 */
1132 err = _mmc_detect_card_removed(host);
1133
1134 mmc_put_card(host->card, NULL);
1135
1136 if (err) {
1137 mmc_sd_remove(host);
1138
1139 mmc_claim_host(host);
1140 mmc_detach_bus(host);
1141 mmc_power_off(host);
1142 mmc_release_host(host);
1143 }
1144}
1145
1146static int _mmc_sd_suspend(struct mmc_host *host)
1147{
1148 int err = 0;
1149
1150 mmc_claim_host(host);
1151
1152 if (mmc_card_suspended(host->card))
1153 goto out;
1154
1155 if (!mmc_host_is_spi(host))
1156 err = mmc_deselect_cards(host);
1157
1158 if (!err) {
1159 mmc_power_off(host);
1160 mmc_card_set_suspended(host->card);
1161 }
1162
1163out:
1164 mmc_release_host(host);
1165 return err;
1166}
1167
1168/*
1169 * Callback for suspend
1170 */
1171static int mmc_sd_suspend(struct mmc_host *host)
1172{
1173 int err;
1174
1175 err = _mmc_sd_suspend(host);
1176 if (!err) {
1177 pm_runtime_disable(&host->card->dev);
1178 pm_runtime_set_suspended(&host->card->dev);
1179 }
1180
1181 return err;
1182}
1183
1184/*
1185 * This function tries to determine if the same card is still present
1186 * and, if so, restore all state to it.
1187 */
1188static int _mmc_sd_resume(struct mmc_host *host)
1189{
1190 int err = 0;
1191
1192 mmc_claim_host(host);
1193
1194 if (!mmc_card_suspended(host->card))
1195 goto out;
1196
1197 mmc_power_up(host, host->card->ocr);
1198 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1199 mmc_card_clr_suspended(host->card);
1200
1201out:
1202 mmc_release_host(host);
1203 return err;
1204}
1205
1206/*
1207 * Callback for resume
1208 */
1209static int mmc_sd_resume(struct mmc_host *host)
1210{
1211 pm_runtime_enable(&host->card->dev);
1212 return 0;
1213}
1214
1215/*
1216 * Callback for runtime_suspend.
1217 */
1218static int mmc_sd_runtime_suspend(struct mmc_host *host)
1219{
1220 int err;
1221
1222 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1223 return 0;
1224
1225 err = _mmc_sd_suspend(host);
1226 if (err)
1227 pr_err("%s: error %d doing aggressive suspend\n",
1228 mmc_hostname(host), err);
1229
1230 return err;
1231}
1232
1233/*
1234 * Callback for runtime_resume.
1235 */
1236static int mmc_sd_runtime_resume(struct mmc_host *host)
1237{
1238 int err;
1239
1240 err = _mmc_sd_resume(host);
1241 if (err && err != -ENOMEDIUM)
1242 pr_err("%s: error %d doing runtime resume\n",
1243 mmc_hostname(host), err);
1244
1245 return 0;
1246}
1247
1248static int mmc_sd_hw_reset(struct mmc_host *host)
1249{
1250 mmc_power_cycle(host, host->card->ocr);
1251 return mmc_sd_init_card(host, host->card->ocr, host->card);
1252}
1253
1254static const struct mmc_bus_ops mmc_sd_ops = {
1255 .remove = mmc_sd_remove,
1256 .detect = mmc_sd_detect,
1257 .runtime_suspend = mmc_sd_runtime_suspend,
1258 .runtime_resume = mmc_sd_runtime_resume,
1259 .suspend = mmc_sd_suspend,
1260 .resume = mmc_sd_resume,
1261 .alive = mmc_sd_alive,
1262 .shutdown = mmc_sd_suspend,
1263 .hw_reset = mmc_sd_hw_reset,
1264};
1265
1266/*
1267 * Starting point for SD card init.
1268 */
1269int mmc_attach_sd(struct mmc_host *host)
1270{
1271 int err;
1272 u32 ocr, rocr;
1273
1274 WARN_ON(!host->claimed);
1275
1276 err = mmc_send_app_op_cond(host, 0, &ocr);
1277 if (err)
1278 return err;
1279
1280 mmc_attach_bus(host, &mmc_sd_ops);
1281 if (host->ocr_avail_sd)
1282 host->ocr_avail = host->ocr_avail_sd;
1283
1284 /*
1285 * We need to get OCR a different way for SPI.
1286 */
1287 if (mmc_host_is_spi(host)) {
1288 mmc_go_idle(host);
1289
1290 err = mmc_spi_read_ocr(host, 0, &ocr);
1291 if (err)
1292 goto err;
1293 }
1294
1295 /*
1296 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1297 * these bits as being in-valid and especially also bit7.
1298 */
1299 ocr &= ~0x7FFF;
1300
1301 rocr = mmc_select_voltage(host, ocr);
1302
1303 /*
1304 * Can we support the voltage(s) of the card(s)?
1305 */
1306 if (!rocr) {
1307 err = -EINVAL;
1308 goto err;
1309 }
1310
1311 /*
1312 * Detect and init the card.
1313 */
1314 err = mmc_sd_init_card(host, rocr, NULL);
1315 if (err)
1316 goto err;
1317
1318 mmc_release_host(host);
1319 err = mmc_add_card(host->card);
1320 if (err)
1321 goto remove_card;
1322
1323 mmc_claim_host(host);
1324 return 0;
1325
1326remove_card:
1327 mmc_remove_card(host->card);
1328 host->card = NULL;
1329 mmc_claim_host(host);
1330err:
1331 mmc_detach_bus(host);
1332
1333 pr_err("%s: error %d whilst initialising SD card\n",
1334 mmc_hostname(host), err);
1335
1336 return err;
1337}