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
30 static const unsigned int tran_exp[] = {
31 10000, 100000, 1000000, 10000000,
32 0, 0, 0, 0
33 };
34
35 static 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
40 static const unsigned int tacc_exp[] = {
41 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
42 };
43
44 static 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
49 static 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 */
mmc_decode_cid(struct mmc_card * card)73 void 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 */
mmc_decode_csd(struct mmc_card * card)100 static 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 */
mmc_decode_scr(struct mmc_card * card)188 static 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 */
mmc_read_ssr(struct mmc_card * card)223 static int mmc_read_ssr(struct mmc_card *card)
224 {
225 unsigned int au, es, et, eo;
226 u32 *raw_ssr;
227 int i;
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 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
236 if (!raw_ssr)
237 return -ENOMEM;
238
239 if (mmc_app_sd_status(card, raw_ssr)) {
240 pr_warn("%s: problem reading SD Status register\n",
241 mmc_hostname(card->host));
242 kfree(raw_ssr);
243 return 0;
244 }
245
246 for (i = 0; i < 16; i++)
247 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
248
249 kfree(raw_ssr);
250
251 /*
252 * UNSTUFF_BITS only works with four u32s so we have to offset the
253 * bitfield positions accordingly.
254 */
255 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
256 if (au) {
257 if (au <= 9 || card->scr.sda_spec3) {
258 card->ssr.au = sd_au_size[au];
259 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
260 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
261 if (es && et) {
262 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
263 card->ssr.erase_timeout = (et * 1000) / es;
264 card->ssr.erase_offset = eo * 1000;
265 }
266 } else {
267 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
268 mmc_hostname(card->host));
269 }
270 }
271
272 return 0;
273 }
274
275 /*
276 * Fetches and decodes switch information
277 */
mmc_read_switch(struct mmc_card * card)278 static 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
333 out:
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 */
mmc_sd_switch_hs(struct mmc_card * card)342 int 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
378 out:
379 kfree(status);
380
381 return err;
382 }
383
sd_select_driver_type(struct mmc_card * card,u8 * status)384 static 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
sd_update_bus_speed_mode(struct mmc_card * card)415 static 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
sd_set_bus_speed_mode(struct mmc_card * card,u8 * status)448 static 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 */
sd_get_host_max_current(struct mmc_host * host)494 static 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
sd_set_current_limit(struct mmc_card * card,u8 * status)518 static 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 */
mmc_sd_init_uhs_card(struct mmc_card * card)585 static 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
658 out:
659 kfree(status);
660
661 return err;
662 }
663
664 MMC_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]);
666 MMC_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]);
668 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
669 MMC_DEV_ATTR(ssr,
670 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
671 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
672 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
673 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
674 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
675 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
676 card->raw_ssr[15]);
677 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
678 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
679 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
680 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
681 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
682 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
683 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
684 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
685 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
686 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
687
688
mmc_dsr_show(struct device * dev,struct device_attribute * attr,char * buf)689 static ssize_t mmc_dsr_show(struct device *dev,
690 struct device_attribute *attr,
691 char *buf)
692 {
693 struct mmc_card *card = mmc_dev_to_card(dev);
694 struct mmc_host *host = card->host;
695
696 if (card->csd.dsr_imp && host->dsr_req)
697 return sprintf(buf, "0x%x\n", host->dsr);
698 else
699 /* return default DSR value */
700 return sprintf(buf, "0x%x\n", 0x404);
701 }
702
703 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
704
705 static struct attribute *sd_std_attrs[] = {
706 &dev_attr_cid.attr,
707 &dev_attr_csd.attr,
708 &dev_attr_scr.attr,
709 &dev_attr_ssr.attr,
710 &dev_attr_date.attr,
711 &dev_attr_erase_size.attr,
712 &dev_attr_preferred_erase_size.attr,
713 &dev_attr_fwrev.attr,
714 &dev_attr_hwrev.attr,
715 &dev_attr_manfid.attr,
716 &dev_attr_name.attr,
717 &dev_attr_oemid.attr,
718 &dev_attr_serial.attr,
719 &dev_attr_ocr.attr,
720 &dev_attr_dsr.attr,
721 NULL,
722 };
723 ATTRIBUTE_GROUPS(sd_std);
724
725 struct device_type sd_type = {
726 .groups = sd_std_groups,
727 };
728
729 /*
730 * Fetch CID from card.
731 */
mmc_sd_get_cid(struct mmc_host * host,u32 ocr,u32 * cid,u32 * rocr)732 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
733 {
734 int err;
735 u32 max_current;
736 int retries = 10;
737 u32 pocr = ocr;
738
739 try_again:
740 if (!retries) {
741 ocr &= ~SD_OCR_S18R;
742 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
743 }
744
745 /*
746 * Since we're changing the OCR value, we seem to
747 * need to tell some cards to go back to the idle
748 * state. We wait 1ms to give cards time to
749 * respond.
750 */
751 mmc_go_idle(host);
752
753 /*
754 * If SD_SEND_IF_COND indicates an SD 2.0
755 * compliant card and we should set bit 30
756 * of the ocr to indicate that we can handle
757 * block-addressed SDHC cards.
758 */
759 err = mmc_send_if_cond(host, ocr);
760 if (!err)
761 ocr |= SD_OCR_CCS;
762
763 /*
764 * If the host supports one of UHS-I modes, request the card
765 * to switch to 1.8V signaling level. If the card has failed
766 * repeatedly to switch however, skip this.
767 */
768 if (retries && mmc_host_uhs(host))
769 ocr |= SD_OCR_S18R;
770
771 /*
772 * If the host can supply more than 150mA at current voltage,
773 * XPC should be set to 1.
774 */
775 max_current = sd_get_host_max_current(host);
776 if (max_current > 150)
777 ocr |= SD_OCR_XPC;
778
779 err = mmc_send_app_op_cond(host, ocr, rocr);
780 if (err)
781 return err;
782
783 /*
784 * In case CCS and S18A in the response is set, start Signal Voltage
785 * Switch procedure. SPI mode doesn't support CMD11.
786 */
787 if (!mmc_host_is_spi(host) && rocr &&
788 ((*rocr & 0x41000000) == 0x41000000)) {
789 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
790 pocr);
791 if (err == -EAGAIN) {
792 retries--;
793 goto try_again;
794 } else if (err) {
795 retries = 0;
796 goto try_again;
797 }
798 }
799
800 if (mmc_host_is_spi(host))
801 err = mmc_send_cid(host, cid);
802 else
803 err = mmc_all_send_cid(host, cid);
804
805 return err;
806 }
807
mmc_sd_get_csd(struct mmc_host * host,struct mmc_card * card)808 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
809 {
810 int err;
811
812 /*
813 * Fetch CSD from card.
814 */
815 err = mmc_send_csd(card, card->raw_csd);
816 if (err)
817 return err;
818
819 err = mmc_decode_csd(card);
820 if (err)
821 return err;
822
823 return 0;
824 }
825
mmc_sd_get_ro(struct mmc_host * host)826 static int mmc_sd_get_ro(struct mmc_host *host)
827 {
828 int ro;
829
830 /*
831 * Some systems don't feature a write-protect pin and don't need one.
832 * E.g. because they only have micro-SD card slot. For those systems
833 * assume that the SD card is always read-write.
834 */
835 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
836 return 0;
837
838 if (!host->ops->get_ro)
839 return -1;
840
841 ro = host->ops->get_ro(host);
842
843 return ro;
844 }
845
mmc_sd_setup_card(struct mmc_host * host,struct mmc_card * card,bool reinit)846 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
847 bool reinit)
848 {
849 int err;
850 #ifdef CONFIG_MMC_PARANOID_SD_INIT
851 int retries;
852 #endif
853
854 if (!reinit) {
855 /*
856 * Fetch SCR from card.
857 */
858 err = mmc_app_send_scr(card, card->raw_scr);
859 if (err)
860 return err;
861
862 err = mmc_decode_scr(card);
863 if (err)
864 return err;
865
866 /*
867 * Fetch and process SD Status register.
868 */
869 err = mmc_read_ssr(card);
870 if (err)
871 return err;
872
873 /* Erase init depends on CSD and SSR */
874 mmc_init_erase(card);
875
876 /*
877 * Fetch switch information from card.
878 */
879 #ifdef CONFIG_MMC_PARANOID_SD_INIT
880 for (retries = 1; retries <= 3; retries++) {
881 err = mmc_read_switch(card);
882 if (!err) {
883 if (retries > 1) {
884 printk(KERN_WARNING
885 "%s: recovered\n",
886 mmc_hostname(host));
887 }
888 break;
889 } else {
890 printk(KERN_WARNING
891 "%s: read switch failed (attempt %d)\n",
892 mmc_hostname(host), retries);
893 }
894 }
895 #else
896 err = mmc_read_switch(card);
897 #endif
898
899 if (err)
900 return err;
901 }
902
903 /*
904 * For SPI, enable CRC as appropriate.
905 * This CRC enable is located AFTER the reading of the
906 * card registers because some SDHC cards are not able
907 * to provide valid CRCs for non-512-byte blocks.
908 */
909 if (mmc_host_is_spi(host)) {
910 err = mmc_spi_set_crc(host, use_spi_crc);
911 if (err)
912 return err;
913 }
914
915 /*
916 * Check if read-only switch is active.
917 */
918 if (!reinit) {
919 int ro = mmc_sd_get_ro(host);
920
921 if (ro < 0) {
922 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
923 mmc_hostname(host));
924 } else if (ro > 0) {
925 mmc_card_set_readonly(card);
926 }
927 }
928
929 return 0;
930 }
931
mmc_sd_get_max_clock(struct mmc_card * card)932 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
933 {
934 unsigned max_dtr = (unsigned int)-1;
935
936 if (mmc_card_hs(card)) {
937 if (max_dtr > card->sw_caps.hs_max_dtr)
938 max_dtr = card->sw_caps.hs_max_dtr;
939 } else if (max_dtr > card->csd.max_dtr) {
940 max_dtr = card->csd.max_dtr;
941 }
942
943 return max_dtr;
944 }
945
946 /*
947 * Handle the detection and initialisation of a card.
948 *
949 * In the case of a resume, "oldcard" will contain the card
950 * we're trying to reinitialise.
951 */
mmc_sd_init_card(struct mmc_host * host,u32 ocr,struct mmc_card * oldcard)952 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
953 struct mmc_card *oldcard)
954 {
955 struct mmc_card *card;
956 int err;
957 u32 cid[4];
958 u32 rocr = 0;
959
960 BUG_ON(!host);
961 WARN_ON(!host->claimed);
962
963 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
964 if (err)
965 return err;
966
967 if (oldcard) {
968 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
969 return -ENOENT;
970
971 card = oldcard;
972 } else {
973 /*
974 * Allocate card structure.
975 */
976 card = mmc_alloc_card(host, &sd_type);
977 if (IS_ERR(card))
978 return PTR_ERR(card);
979
980 card->ocr = ocr;
981 card->type = MMC_TYPE_SD;
982 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
983 }
984
985 /*
986 * Call the optional HC's init_card function to handle quirks.
987 */
988 if (host->ops->init_card)
989 host->ops->init_card(host, card);
990
991 /*
992 * For native busses: get card RCA and quit open drain mode.
993 */
994 if (!mmc_host_is_spi(host)) {
995 err = mmc_send_relative_addr(host, &card->rca);
996 if (err)
997 goto free_card;
998 }
999
1000 if (!oldcard) {
1001 err = mmc_sd_get_csd(host, card);
1002 if (err)
1003 goto free_card;
1004
1005 mmc_decode_cid(card);
1006 }
1007
1008 /*
1009 * handling only for cards supporting DSR and hosts requesting
1010 * DSR configuration
1011 */
1012 if (card->csd.dsr_imp && host->dsr_req)
1013 mmc_set_dsr(host);
1014
1015 /*
1016 * Select card, as all following commands rely on that.
1017 */
1018 if (!mmc_host_is_spi(host)) {
1019 err = mmc_select_card(card);
1020 if (err)
1021 goto free_card;
1022 }
1023
1024 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1025 if (err)
1026 goto free_card;
1027
1028 /* Initialization sequence for UHS-I cards */
1029 if (rocr & SD_ROCR_S18A) {
1030 err = mmc_sd_init_uhs_card(card);
1031 if (err)
1032 goto free_card;
1033 } else {
1034 /*
1035 * Attempt to change to high-speed (if supported)
1036 */
1037 err = mmc_sd_switch_hs(card);
1038 if (err > 0)
1039 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1040 else if (err)
1041 goto free_card;
1042
1043 /*
1044 * Set bus speed.
1045 */
1046 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1047
1048 /*
1049 * Switch to wider bus (if supported).
1050 */
1051 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1052 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1053 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1054 if (err)
1055 goto free_card;
1056
1057 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1058 }
1059 }
1060
1061 host->card = card;
1062 return 0;
1063
1064 free_card:
1065 if (!oldcard)
1066 mmc_remove_card(card);
1067
1068 return err;
1069 }
1070
1071 /*
1072 * Host is being removed. Free up the current card.
1073 */
mmc_sd_remove(struct mmc_host * host)1074 static void mmc_sd_remove(struct mmc_host *host)
1075 {
1076 BUG_ON(!host);
1077 BUG_ON(!host->card);
1078
1079 mmc_remove_card(host->card);
1080 host->card = NULL;
1081 }
1082
1083 /*
1084 * Card detection - card is alive.
1085 */
mmc_sd_alive(struct mmc_host * host)1086 static int mmc_sd_alive(struct mmc_host *host)
1087 {
1088 return mmc_send_status(host->card, NULL);
1089 }
1090
1091 /*
1092 * Card detection callback from host.
1093 */
mmc_sd_detect(struct mmc_host * host)1094 static void mmc_sd_detect(struct mmc_host *host)
1095 {
1096 int err = 0;
1097 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1098 int retries = 5;
1099 #endif
1100
1101 BUG_ON(!host);
1102 BUG_ON(!host->card);
1103
1104 mmc_get_card(host->card);
1105
1106 /*
1107 * Just check if our card has been removed.
1108 */
1109 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1110 while(retries) {
1111 err = mmc_send_status(host->card, NULL);
1112 if (err) {
1113 retries--;
1114 udelay(5);
1115 continue;
1116 }
1117 break;
1118 }
1119 if (!retries) {
1120 printk(KERN_ERR "%s(%s): Unable to re-detect card (%d)\n",
1121 __func__, mmc_hostname(host), err);
1122 }
1123 #else
1124 err = _mmc_detect_card_removed(host);
1125 #endif
1126
1127 mmc_put_card(host->card);
1128
1129 if (err) {
1130 mmc_sd_remove(host);
1131
1132 mmc_claim_host(host);
1133 mmc_detach_bus(host);
1134 mmc_power_off(host);
1135 mmc_release_host(host);
1136 }
1137 }
1138
_mmc_sd_suspend(struct mmc_host * host)1139 static int _mmc_sd_suspend(struct mmc_host *host)
1140 {
1141 int err = 0;
1142
1143 BUG_ON(!host);
1144 BUG_ON(!host->card);
1145
1146 mmc_claim_host(host);
1147
1148 if (mmc_card_suspended(host->card))
1149 goto out;
1150
1151 if (!mmc_host_is_spi(host))
1152 err = mmc_deselect_cards(host);
1153
1154 if (!err) {
1155 mmc_power_off(host);
1156 mmc_card_set_suspended(host->card);
1157 }
1158
1159 out:
1160 mmc_release_host(host);
1161 return err;
1162 }
1163
1164 /*
1165 * Callback for suspend
1166 */
mmc_sd_suspend(struct mmc_host * host)1167 static int mmc_sd_suspend(struct mmc_host *host)
1168 {
1169 int err;
1170
1171 err = _mmc_sd_suspend(host);
1172 if (!err) {
1173 pm_runtime_disable(&host->card->dev);
1174 pm_runtime_set_suspended(&host->card->dev);
1175 }
1176
1177 return err;
1178 }
1179
1180 /*
1181 * This function tries to determine if the same card is still present
1182 * and, if so, restore all state to it.
1183 */
_mmc_sd_resume(struct mmc_host * host)1184 static int _mmc_sd_resume(struct mmc_host *host)
1185 {
1186 int err = 0;
1187 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1188 int retries;
1189 #endif
1190
1191 BUG_ON(!host);
1192 BUG_ON(!host->card);
1193
1194 mmc_claim_host(host);
1195
1196 if (!mmc_card_suspended(host->card))
1197 goto out;
1198
1199 mmc_power_up(host, host->card->ocr);
1200 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1201 retries = 5;
1202 while (retries) {
1203 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1204
1205 if (err) {
1206 printk(KERN_ERR "%s: Re-init card rc = %d (retries = %d)\n",
1207 mmc_hostname(host), err, retries);
1208 mdelay(5);
1209 retries--;
1210 continue;
1211 }
1212 break;
1213 }
1214 #else
1215 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1216 #endif
1217 mmc_card_clr_suspended(host->card);
1218
1219 out:
1220 mmc_release_host(host);
1221 return err;
1222 }
1223
1224 /*
1225 * Callback for resume
1226 */
mmc_sd_resume(struct mmc_host * host)1227 static int mmc_sd_resume(struct mmc_host *host)
1228 {
1229 pm_runtime_enable(&host->card->dev);
1230 return 0;
1231 }
1232
1233 /*
1234 * Callback for runtime_suspend.
1235 */
mmc_sd_runtime_suspend(struct mmc_host * host)1236 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1237 {
1238 int err;
1239
1240 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1241 return 0;
1242
1243 err = _mmc_sd_suspend(host);
1244 if (err)
1245 pr_err("%s: error %d doing aggressive suspend\n",
1246 mmc_hostname(host), err);
1247
1248 return err;
1249 }
1250
1251 /*
1252 * Callback for runtime_resume.
1253 */
mmc_sd_runtime_resume(struct mmc_host * host)1254 static int mmc_sd_runtime_resume(struct mmc_host *host)
1255 {
1256 int err;
1257
1258 err = _mmc_sd_resume(host);
1259 if (err && err != -ENOMEDIUM)
1260 pr_err("%s: error %d doing runtime resume\n",
1261 mmc_hostname(host), err);
1262
1263 return 0;
1264 }
1265
mmc_sd_reset(struct mmc_host * host)1266 static int mmc_sd_reset(struct mmc_host *host)
1267 {
1268 mmc_power_cycle(host, host->card->ocr);
1269 return mmc_sd_init_card(host, host->card->ocr, host->card);
1270 }
1271
1272 static const struct mmc_bus_ops mmc_sd_ops = {
1273 .remove = mmc_sd_remove,
1274 .detect = mmc_sd_detect,
1275 .runtime_suspend = mmc_sd_runtime_suspend,
1276 .runtime_resume = mmc_sd_runtime_resume,
1277 .suspend = mmc_sd_suspend,
1278 .resume = mmc_sd_resume,
1279 .alive = mmc_sd_alive,
1280 .shutdown = mmc_sd_suspend,
1281 .reset = mmc_sd_reset,
1282 };
1283
1284 /*
1285 * Starting point for SD card init.
1286 */
mmc_attach_sd(struct mmc_host * host)1287 int mmc_attach_sd(struct mmc_host *host)
1288 {
1289 int err;
1290 u32 ocr, rocr;
1291 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1292 int retries;
1293 #endif
1294
1295 BUG_ON(!host);
1296 WARN_ON(!host->claimed);
1297
1298 err = mmc_send_app_op_cond(host, 0, &ocr);
1299 if (err)
1300 return err;
1301
1302 mmc_attach_bus(host, &mmc_sd_ops);
1303 if (host->ocr_avail_sd)
1304 host->ocr_avail = host->ocr_avail_sd;
1305
1306 /*
1307 * We need to get OCR a different way for SPI.
1308 */
1309 if (mmc_host_is_spi(host)) {
1310 mmc_go_idle(host);
1311
1312 err = mmc_spi_read_ocr(host, 0, &ocr);
1313 if (err)
1314 goto err;
1315 }
1316
1317 rocr = mmc_select_voltage(host, ocr);
1318
1319 /*
1320 * Can we support the voltage(s) of the card(s)?
1321 */
1322 if (!rocr) {
1323 err = -EINVAL;
1324 goto err;
1325 }
1326
1327 /*
1328 * Detect and init the card.
1329 */
1330 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1331 retries = 5;
1332 while (retries) {
1333 err = mmc_sd_init_card(host, rocr, NULL);
1334 if (err) {
1335 retries--;
1336 continue;
1337 }
1338 break;
1339 }
1340
1341 if (!retries) {
1342 printk(KERN_ERR "%s: mmc_sd_init_card() failure (err = %d)\n",
1343 mmc_hostname(host), err);
1344 goto err;
1345 }
1346 #else
1347 err = mmc_sd_init_card(host, rocr, NULL);
1348 if (err)
1349 goto err;
1350 #endif
1351
1352 mmc_release_host(host);
1353 err = mmc_add_card(host->card);
1354 if (err)
1355 goto remove_card;
1356
1357 mmc_claim_host(host);
1358 return 0;
1359
1360 remove_card:
1361 mmc_remove_card(host->card);
1362 host->card = NULL;
1363 mmc_claim_host(host);
1364 err:
1365 mmc_detach_bus(host);
1366
1367 pr_err("%s: error %d whilst initialising SD card\n",
1368 mmc_hostname(host), err);
1369
1370 return err;
1371 }
1372