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