Loading...
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/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