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Linux 4.19.133
[linux/fpc-iii.git] / drivers / mmc / core / sd.c
blob04738359ec0292797136344778879999212d8651
1 /*
2 * linux/drivers/mmc/core/sd.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/err.h>
14 #include <linux/sizes.h>
15 #include <linux/slab.h>
16 #include <linux/stat.h>
17 #include <linux/pm_runtime.h>
18
19 #include <linux/mmc/host.h>
20 #include <linux/mmc/card.h>
21 #include <linux/mmc/mmc.h>
22 #include <linux/mmc/sd.h>
23
24 #include "core.h"
25 #include "card.h"
26 #include "host.h"
27 #include "bus.h"
28 #include "mmc_ops.h"
29 #include "sd.h"
30 #include "sd_ops.h"
31
32 static const unsigned int tran_exp[] = {
33 10000, 100000, 1000000, 10000000,
34 0, 0, 0, 0
35 };
36
37 static const unsigned char tran_mant[] = {
38 0, 10, 12, 13, 15, 20, 25, 30,
39 35, 40, 45, 50, 55, 60, 70, 80,
40 };
41
42 static const unsigned int taac_exp[] = {
43 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
44 };
45
46 static const unsigned int taac_mant[] = {
47 0, 10, 12, 13, 15, 20, 25, 30,
48 35, 40, 45, 50, 55, 60, 70, 80,
49 };
50
51 static const unsigned int sd_au_size[] = {
52 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
53 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
54 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
55 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
56 };
57
58 #define UNSTUFF_BITS(resp,start,size) \
59 ({ \
60 const int __size = size; \
61 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
62 const int __off = 3 - ((start) / 32); \
63 const int __shft = (start) & 31; \
64 u32 __res; \
65 \
66 __res = resp[__off] >> __shft; \
67 if (__size + __shft > 32) \
68 __res |= resp[__off-1] << ((32 - __shft) % 32); \
69 __res & __mask; \
70 })
71
72 /*
73 * Given the decoded CSD structure, decode the raw CID to our CID structure.
74 */
75 void mmc_decode_cid(struct mmc_card *card)
76 {
77 u32 *resp = card->raw_cid;
78
79 /*
80 * SD doesn't currently have a version field so we will
81 * have to assume we can parse this.
82 */
83 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
84 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
85 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
86 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
87 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
88 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
89 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
90 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
91 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
92 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
93 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
94 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
95
96 card->cid.year += 2000; /* SD cards year offset */
97 }
98
99 /*
100 * Given a 128-bit response, decode to our card CSD structure.
101 */
102 static int mmc_decode_csd(struct mmc_card *card)
103 {
104 struct mmc_csd *csd = &card->csd;
105 unsigned int e, m, csd_struct;
106 u32 *resp = card->raw_csd;
107
108 csd_struct = UNSTUFF_BITS(resp, 126, 2);
109
110 switch (csd_struct) {
111 case 0:
112 m = UNSTUFF_BITS(resp, 115, 4);
113 e = UNSTUFF_BITS(resp, 112, 3);
114 csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10;
115 csd->taac_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
116
117 m = UNSTUFF_BITS(resp, 99, 4);
118 e = UNSTUFF_BITS(resp, 96, 3);
119 csd->max_dtr = tran_exp[e] * tran_mant[m];
120 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
121
122 e = UNSTUFF_BITS(resp, 47, 3);
123 m = UNSTUFF_BITS(resp, 62, 12);
124 csd->capacity = (1 + m) << (e + 2);
125
126 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
127 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
128 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
129 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
130 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
131 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
132 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
133 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
134
135 if (UNSTUFF_BITS(resp, 46, 1)) {
136 csd->erase_size = 1;
137 } else if (csd->write_blkbits >= 9) {
138 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
139 csd->erase_size <<= csd->write_blkbits - 9;
140 }
141 break;
142 case 1:
143 /*
144 * This is a block-addressed SDHC or SDXC card. Most
145 * interesting fields are unused and have fixed
146 * values. To avoid getting tripped by buggy cards,
147 * we assume those fixed values ourselves.
148 */
149 mmc_card_set_blockaddr(card);
150
151 csd->taac_ns = 0; /* Unused */
152 csd->taac_clks = 0; /* Unused */
153
154 m = UNSTUFF_BITS(resp, 99, 4);
155 e = UNSTUFF_BITS(resp, 96, 3);
156 csd->max_dtr = tran_exp[e] * tran_mant[m];
157 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
158 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
159
160 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
161 if (csd->c_size >= 0xFFFF)
162 mmc_card_set_ext_capacity(card);
163
164 m = UNSTUFF_BITS(resp, 48, 22);
165 csd->capacity = (1 + m) << 10;
166
167 csd->read_blkbits = 9;
168 csd->read_partial = 0;
169 csd->write_misalign = 0;
170 csd->read_misalign = 0;
171 csd->r2w_factor = 4; /* Unused */
172 csd->write_blkbits = 9;
173 csd->write_partial = 0;
174 csd->erase_size = 1;
175 break;
176 default:
177 pr_err("%s: unrecognised CSD structure version %d\n",
178 mmc_hostname(card->host), csd_struct);
179 return -EINVAL;
180 }
181
182 card->erase_size = csd->erase_size;
183
184 return 0;
185 }
186
187 /*
188 * Given a 64-bit response, decode to our card SCR structure.
189 */
190 static int mmc_decode_scr(struct mmc_card *card)
191 {
192 struct sd_scr *scr = &card->scr;
193 unsigned int scr_struct;
194 u32 resp[4];
195
196 resp[3] = card->raw_scr[1];
197 resp[2] = card->raw_scr[0];
198
199 scr_struct = UNSTUFF_BITS(resp, 60, 4);
200 if (scr_struct != 0) {
201 pr_err("%s: unrecognised SCR structure version %d\n",
202 mmc_hostname(card->host), scr_struct);
203 return -EINVAL;
204 }
205
206 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
207 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
208 if (scr->sda_vsn == SCR_SPEC_VER_2)
209 /* Check if Physical Layer Spec v3.0 is supported */
210 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
211
212 if (UNSTUFF_BITS(resp, 55, 1))
213 card->erased_byte = 0xFF;
214 else
215 card->erased_byte = 0x0;
216
217 if (scr->sda_spec3)
218 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
219
220 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */
221 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
222 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
223 pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
224 return -EINVAL;
225 }
226
227 return 0;
228 }
229
230 /*
231 * Fetch and process SD Status register.
232 */
233 static int mmc_read_ssr(struct mmc_card *card)
234 {
235 unsigned int au, es, et, eo;
236 __be32 *raw_ssr;
237 int i;
238
239 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
240 pr_warn("%s: card lacks mandatory SD Status function\n",
241 mmc_hostname(card->host));
242 return 0;
243 }
244
245 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
246 if (!raw_ssr)
247 return -ENOMEM;
248
249 if (mmc_app_sd_status(card, raw_ssr)) {
250 pr_warn("%s: problem reading SD Status register\n",
251 mmc_hostname(card->host));
252 kfree(raw_ssr);
253 return 0;
254 }
255
256 for (i = 0; i < 16; i++)
257 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
258
259 kfree(raw_ssr);
260
261 /*
262 * UNSTUFF_BITS only works with four u32s so we have to offset the
263 * bitfield positions accordingly.
264 */
265 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
266 if (au) {
267 if (au <= 9 || card->scr.sda_spec3) {
268 card->ssr.au = sd_au_size[au];
269 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
270 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
271 if (es && et) {
272 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
273 card->ssr.erase_timeout = (et * 1000) / es;
274 card->ssr.erase_offset = eo * 1000;
275 }
276 } else {
277 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
278 mmc_hostname(card->host));
279 }
280 }
281
282 return 0;
283 }
284
285 /*
286 * Fetches and decodes switch information
287 */
288 static int mmc_read_switch(struct mmc_card *card)
289 {
290 int err;
291 u8 *status;
292
293 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
294 return 0;
295
296 if (!(card->csd.cmdclass & CCC_SWITCH)) {
297 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
298 mmc_hostname(card->host));
299 return 0;
300 }
301
302 status = kmalloc(64, GFP_KERNEL);
303 if (!status)
304 return -ENOMEM;
305
306 /*
307 * Find out the card's support bits with a mode 0 operation.
308 * The argument does not matter, as the support bits do not
309 * change with the arguments.
310 */
311 err = mmc_sd_switch(card, 0, 0, 0, status);
312 if (err) {
313 /*
314 * If the host or the card can't do the switch,
315 * fail more gracefully.
316 */
317 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
318 goto out;
319
320 pr_warn("%s: problem reading Bus Speed modes\n",
321 mmc_hostname(card->host));
322 err = 0;
323
324 goto out;
325 }
326
327 if (status[13] & SD_MODE_HIGH_SPEED)
328 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
329
330 if (card->scr.sda_spec3) {
331 card->sw_caps.sd3_bus_mode = status[13];
332 /* Driver Strengths supported by the card */
333 card->sw_caps.sd3_drv_type = status[9];
334 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
335 }
336
337 out:
338 kfree(status);
339
340 return err;
341 }
342
343 /*
344 * Test if the card supports high-speed mode and, if so, switch to it.
345 */
346 int mmc_sd_switch_hs(struct mmc_card *card)
347 {
348 int err;
349 u8 *status;
350
351 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
352 return 0;
353
354 if (!(card->csd.cmdclass & CCC_SWITCH))
355 return 0;
356
357 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
358 return 0;
359
360 if (card->sw_caps.hs_max_dtr == 0)
361 return 0;
362
363 status = kmalloc(64, GFP_KERNEL);
364 if (!status)
365 return -ENOMEM;
366
367 err = mmc_sd_switch(card, 1, 0, 1, status);
368 if (err)
369 goto out;
370
371 if ((status[16] & 0xF) != 1) {
372 pr_warn("%s: Problem switching card into high-speed mode!\n",
373 mmc_hostname(card->host));
374 err = 0;
375 } else {
376 err = 1;
377 }
378
379 out:
380 kfree(status);
381
382 return err;
383 }
384
385 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
386 {
387 int card_drv_type, drive_strength, drv_type;
388 int err;
389
390 card->drive_strength = 0;
391
392 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
393
394 drive_strength = mmc_select_drive_strength(card,
395 card->sw_caps.uhs_max_dtr,
396 card_drv_type, &drv_type);
397
398 if (drive_strength) {
399 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
400 if (err)
401 return err;
402 if ((status[15] & 0xF) != drive_strength) {
403 pr_warn("%s: Problem setting drive strength!\n",
404 mmc_hostname(card->host));
405 return 0;
406 }
407 card->drive_strength = drive_strength;
408 }
409
410 if (drv_type)
411 mmc_set_driver_type(card->host, drv_type);
412
413 return 0;
414 }
415
416 static void sd_update_bus_speed_mode(struct mmc_card *card)
417 {
418 /*
419 * If the host doesn't support any of the UHS-I modes, fallback on
420 * default speed.
421 */
422 if (!mmc_host_uhs(card->host)) {
423 card->sd_bus_speed = 0;
424 return;
425 }
426
427 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
428 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
429 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
430 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
431 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
432 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
433 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
434 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
435 SD_MODE_UHS_SDR50)) {
436 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
437 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
438 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
439 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
440 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
441 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
442 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
443 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
444 SD_MODE_UHS_SDR12)) {
445 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
446 }
447 }
448
449 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
450 {
451 int err;
452 unsigned int timing = 0;
453
454 switch (card->sd_bus_speed) {
455 case UHS_SDR104_BUS_SPEED:
456 timing = MMC_TIMING_UHS_SDR104;
457 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
458 break;
459 case UHS_DDR50_BUS_SPEED:
460 timing = MMC_TIMING_UHS_DDR50;
461 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
462 break;
463 case UHS_SDR50_BUS_SPEED:
464 timing = MMC_TIMING_UHS_SDR50;
465 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
466 break;
467 case UHS_SDR25_BUS_SPEED:
468 timing = MMC_TIMING_UHS_SDR25;
469 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
470 break;
471 case UHS_SDR12_BUS_SPEED:
472 timing = MMC_TIMING_UHS_SDR12;
473 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
474 break;
475 default:
476 return 0;
477 }
478
479 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
480 if (err)
481 return err;
482
483 if ((status[16] & 0xF) != card->sd_bus_speed)
484 pr_warn("%s: Problem setting bus speed mode!\n",
485 mmc_hostname(card->host));
486 else {
487 mmc_set_timing(card->host, timing);
488 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
489 }
490
491 return 0;
492 }
493
494 /* Get host's max current setting at its current voltage */
495 static u32 sd_get_host_max_current(struct mmc_host *host)
496 {
497 u32 voltage, max_current;
498
499 voltage = 1 << host->ios.vdd;
500 switch (voltage) {
501 case MMC_VDD_165_195:
502 max_current = host->max_current_180;
503 break;
504 case MMC_VDD_29_30:
505 case MMC_VDD_30_31:
506 max_current = host->max_current_300;
507 break;
508 case MMC_VDD_32_33:
509 case MMC_VDD_33_34:
510 max_current = host->max_current_330;
511 break;
512 default:
513 max_current = 0;
514 }
515
516 return max_current;
517 }
518
519 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
520 {
521 int current_limit = SD_SET_CURRENT_NO_CHANGE;
522 int err;
523 u32 max_current;
524
525 /*
526 * Current limit switch is only defined for SDR50, SDR104, and DDR50
527 * bus speed modes. For other bus speed modes, we do not change the
528 * current limit.
529 */
530 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
531 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
532 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
533 return 0;
534
535 /*
536 * Host has different current capabilities when operating at
537 * different voltages, so find out its max current first.
538 */
539 max_current = sd_get_host_max_current(card->host);
540
541 /*
542 * We only check host's capability here, if we set a limit that is
543 * higher than the card's maximum current, the card will be using its
544 * maximum current, e.g. if the card's maximum current is 300ma, and
545 * when we set current limit to 200ma, the card will draw 200ma, and
546 * when we set current limit to 400/600/800ma, the card will draw its
547 * maximum 300ma from the host.
548 *
549 * The above is incorrect: if we try to set a current limit that is
550 * not supported by the card, the card can rightfully error out the
551 * attempt, and remain at the default current limit. This results
552 * in a 300mA card being limited to 200mA even though the host
553 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
554 * an iMX6 host. --rmk
555 */
556 if (max_current >= 800 &&
557 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
558 current_limit = SD_SET_CURRENT_LIMIT_800;
559 else if (max_current >= 600 &&
560 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
561 current_limit = SD_SET_CURRENT_LIMIT_600;
562 else if (max_current >= 400 &&
563 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
564 current_limit = SD_SET_CURRENT_LIMIT_400;
565 else if (max_current >= 200 &&
566 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
567 current_limit = SD_SET_CURRENT_LIMIT_200;
568
569 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
570 err = mmc_sd_switch(card, 1, 3, current_limit, status);
571 if (err)
572 return err;
573
574 if (((status[15] >> 4) & 0x0F) != current_limit)
575 pr_warn("%s: Problem setting current limit!\n",
576 mmc_hostname(card->host));
577
578 }
579
580 return 0;
581 }
582
583 /*
584 * UHS-I specific initialization procedure
585 */
586 static int mmc_sd_init_uhs_card(struct mmc_card *card)
587 {
588 int err;
589 u8 *status;
590
591 if (!(card->csd.cmdclass & CCC_SWITCH))
592 return 0;
593
594 status = kmalloc(64, GFP_KERNEL);
595 if (!status)
596 return -ENOMEM;
597
598 /* Set 4-bit bus width */
599 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
600 if (err)
601 goto out;
602
603 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
604
605 /*
606 * Select the bus speed mode depending on host
607 * and card capability.
608 */
609 sd_update_bus_speed_mode(card);
610
611 /* Set the driver strength for the card */
612 err = sd_select_driver_type(card, status);
613 if (err)
614 goto out;
615
616 /* Set current limit for the card */
617 err = sd_set_current_limit(card, status);
618 if (err)
619 goto out;
620
621 /* Set bus speed mode of the card */
622 err = sd_set_bus_speed_mode(card, status);
623 if (err)
624 goto out;
625
626 /*
627 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
628 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
629 */
630 if (!mmc_host_is_spi(card->host) &&
631 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
632 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
633 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
634 err = mmc_execute_tuning(card);
635
636 /*
637 * As SD Specifications Part1 Physical Layer Specification
638 * Version 3.01 says, CMD19 tuning is available for unlocked
639 * cards in transfer state of 1.8V signaling mode. The small
640 * difference between v3.00 and 3.01 spec means that CMD19
641 * tuning is also available for DDR50 mode.
642 */
643 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
644 pr_warn("%s: ddr50 tuning failed\n",
645 mmc_hostname(card->host));
646 err = 0;
647 }
648 }
649
650 out:
651 kfree(status);
652
653 return err;
654 }
655
656 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
657 card->raw_cid[2], card->raw_cid[3]);
658 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
659 card->raw_csd[2], card->raw_csd[3]);
660 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
661 MMC_DEV_ATTR(ssr,
662 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
663 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
664 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
665 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
666 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
667 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
668 card->raw_ssr[15]);
669 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
670 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
671 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
672 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
673 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
674 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
675 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
676 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
677 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
678 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
679 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
680
681
682 static ssize_t mmc_dsr_show(struct device *dev,
683 struct device_attribute *attr,
684 char *buf)
685 {
686 struct mmc_card *card = mmc_dev_to_card(dev);
687 struct mmc_host *host = card->host;
688
689 if (card->csd.dsr_imp && host->dsr_req)
690 return sprintf(buf, "0x%x\n", host->dsr);
691 else
692 /* return default DSR value */
693 return sprintf(buf, "0x%x\n", 0x404);
694 }
695
696 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
697
698 static struct attribute *sd_std_attrs[] = {
699 &dev_attr_cid.attr,
700 &dev_attr_csd.attr,
701 &dev_attr_scr.attr,
702 &dev_attr_ssr.attr,
703 &dev_attr_date.attr,
704 &dev_attr_erase_size.attr,
705 &dev_attr_preferred_erase_size.attr,
706 &dev_attr_fwrev.attr,
707 &dev_attr_hwrev.attr,
708 &dev_attr_manfid.attr,
709 &dev_attr_name.attr,
710 &dev_attr_oemid.attr,
711 &dev_attr_serial.attr,
712 &dev_attr_ocr.attr,
713 &dev_attr_rca.attr,
714 &dev_attr_dsr.attr,
715 NULL,
716 };
717 ATTRIBUTE_GROUPS(sd_std);
718
719 struct device_type sd_type = {
720 .groups = sd_std_groups,
721 };
722
723 /*
724 * Fetch CID from card.
725 */
726 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
727 {
728 int err;
729 u32 max_current;
730 int retries = 10;
731 u32 pocr = ocr;
732
733 try_again:
734 if (!retries) {
735 ocr &= ~SD_OCR_S18R;
736 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
737 }
738
739 /*
740 * Since we're changing the OCR value, we seem to
741 * need to tell some cards to go back to the idle
742 * state. We wait 1ms to give cards time to
743 * respond.
744 */
745 mmc_go_idle(host);
746
747 /*
748 * If SD_SEND_IF_COND indicates an SD 2.0
749 * compliant card and we should set bit 30
750 * of the ocr to indicate that we can handle
751 * block-addressed SDHC cards.
752 */
753 err = mmc_send_if_cond(host, ocr);
754 if (!err)
755 ocr |= SD_OCR_CCS;
756
757 /*
758 * If the host supports one of UHS-I modes, request the card
759 * to switch to 1.8V signaling level. If the card has failed
760 * repeatedly to switch however, skip this.
761 */
762 if (retries && mmc_host_uhs(host))
763 ocr |= SD_OCR_S18R;
764
765 /*
766 * If the host can supply more than 150mA at current voltage,
767 * XPC should be set to 1.
768 */
769 max_current = sd_get_host_max_current(host);
770 if (max_current > 150)
771 ocr |= SD_OCR_XPC;
772
773 err = mmc_send_app_op_cond(host, ocr, rocr);
774 if (err)
775 return err;
776
777 /*
778 * In case CCS and S18A in the response is set, start Signal Voltage
779 * Switch procedure. SPI mode doesn't support CMD11.
780 */
781 if (!mmc_host_is_spi(host) && rocr &&
782 ((*rocr & 0x41000000) == 0x41000000)) {
783 err = mmc_set_uhs_voltage(host, pocr);
784 if (err == -EAGAIN) {
785 retries--;
786 goto try_again;
787 } else if (err) {
788 retries = 0;
789 goto try_again;
790 }
791 }
792
793 err = mmc_send_cid(host, cid);
794 return err;
795 }
796
797 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
798 {
799 int err;
800
801 /*
802 * Fetch CSD from card.
803 */
804 err = mmc_send_csd(card, card->raw_csd);
805 if (err)
806 return err;
807
808 err = mmc_decode_csd(card);
809 if (err)
810 return err;
811
812 return 0;
813 }
814
815 static int mmc_sd_get_ro(struct mmc_host *host)
816 {
817 int ro;
818
819 /*
820 * Some systems don't feature a write-protect pin and don't need one.
821 * E.g. because they only have micro-SD card slot. For those systems
822 * assume that the SD card is always read-write.
823 */
824 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
825 return 0;
826
827 if (!host->ops->get_ro)
828 return -1;
829
830 ro = host->ops->get_ro(host);
831
832 return ro;
833 }
834
835 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
836 bool reinit)
837 {
838 int err;
839
840 if (!reinit) {
841 /*
842 * Fetch SCR from card.
843 */
844 err = mmc_app_send_scr(card);
845 if (err)
846 return err;
847
848 err = mmc_decode_scr(card);
849 if (err)
850 return err;
851
852 /*
853 * Fetch and process SD Status register.
854 */
855 err = mmc_read_ssr(card);
856 if (err)
857 return err;
858
859 /* Erase init depends on CSD and SSR */
860 mmc_init_erase(card);
861
862 /*
863 * Fetch switch information from card.
864 */
865 err = mmc_read_switch(card);
866 if (err)
867 return err;
868 }
869
870 /*
871 * For SPI, enable CRC as appropriate.
872 * This CRC enable is located AFTER the reading of the
873 * card registers because some SDHC cards are not able
874 * to provide valid CRCs for non-512-byte blocks.
875 */
876 if (mmc_host_is_spi(host)) {
877 err = mmc_spi_set_crc(host, use_spi_crc);
878 if (err)
879 return err;
880 }
881
882 /*
883 * Check if read-only switch is active.
884 */
885 if (!reinit) {
886 int ro = mmc_sd_get_ro(host);
887
888 if (ro < 0) {
889 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
890 mmc_hostname(host));
891 } else if (ro > 0) {
892 mmc_card_set_readonly(card);
893 }
894 }
895
896 return 0;
897 }
898
899 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
900 {
901 unsigned max_dtr = (unsigned int)-1;
902
903 if (mmc_card_hs(card)) {
904 if (max_dtr > card->sw_caps.hs_max_dtr)
905 max_dtr = card->sw_caps.hs_max_dtr;
906 } else if (max_dtr > card->csd.max_dtr) {
907 max_dtr = card->csd.max_dtr;
908 }
909
910 return max_dtr;
911 }
912
913 static bool mmc_sd_card_using_v18(struct mmc_card *card)
914 {
915 /*
916 * According to the SD spec., the Bus Speed Mode (function group 1) bits
917 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus
918 * they can be used to determine if the card has already switched to
919 * 1.8V signaling.
920 */
921 return card->sw_caps.sd3_bus_mode &
922 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50);
923 }
924
925 /*
926 * Handle the detection and initialisation of a card.
927 *
928 * In the case of a resume, "oldcard" will contain the card
929 * we're trying to reinitialise.
930 */
931 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
932 struct mmc_card *oldcard)
933 {
934 struct mmc_card *card;
935 int err;
936 u32 cid[4];
937 u32 rocr = 0;
938 bool v18_fixup_failed = false;
939
940 WARN_ON(!host->claimed);
941 retry:
942 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
943 if (err)
944 return err;
945
946 if (oldcard) {
947 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
948 return -ENOENT;
949
950 card = oldcard;
951 } else {
952 /*
953 * Allocate card structure.
954 */
955 card = mmc_alloc_card(host, &sd_type);
956 if (IS_ERR(card))
957 return PTR_ERR(card);
958
959 card->ocr = ocr;
960 card->type = MMC_TYPE_SD;
961 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
962 }
963
964 /*
965 * Call the optional HC's init_card function to handle quirks.
966 */
967 if (host->ops->init_card)
968 host->ops->init_card(host, card);
969
970 /*
971 * For native busses: get card RCA and quit open drain mode.
972 */
973 if (!mmc_host_is_spi(host)) {
974 err = mmc_send_relative_addr(host, &card->rca);
975 if (err)
976 goto free_card;
977 }
978
979 if (!oldcard) {
980 err = mmc_sd_get_csd(host, card);
981 if (err)
982 goto free_card;
983
984 mmc_decode_cid(card);
985 }
986
987 /*
988 * handling only for cards supporting DSR and hosts requesting
989 * DSR configuration
990 */
991 if (card->csd.dsr_imp && host->dsr_req)
992 mmc_set_dsr(host);
993
994 /*
995 * Select card, as all following commands rely on that.
996 */
997 if (!mmc_host_is_spi(host)) {
998 err = mmc_select_card(card);
999 if (err)
1000 goto free_card;
1001 }
1002
1003 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1004 if (err)
1005 goto free_card;
1006
1007 /*
1008 * If the card has not been power cycled, it may still be using 1.8V
1009 * signaling. Detect that situation and try to initialize a UHS-I (1.8V)
1010 * transfer mode.
1011 */
1012 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
1013 mmc_sd_card_using_v18(card) &&
1014 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
1015 /*
1016 * Re-read switch information in case it has changed since
1017 * oldcard was initialized.
1018 */
1019 if (oldcard) {
1020 err = mmc_read_switch(card);
1021 if (err)
1022 goto free_card;
1023 }
1024 if (mmc_sd_card_using_v18(card)) {
1025 if (mmc_host_set_uhs_voltage(host) ||
1026 mmc_sd_init_uhs_card(card)) {
1027 v18_fixup_failed = true;
1028 mmc_power_cycle(host, ocr);
1029 if (!oldcard)
1030 mmc_remove_card(card);
1031 goto retry;
1032 }
1033 goto done;
1034 }
1035 }
1036
1037 /* Initialization sequence for UHS-I cards */
1038 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {
1039 err = mmc_sd_init_uhs_card(card);
1040 if (err)
1041 goto free_card;
1042 } else {
1043 /*
1044 * Attempt to change to high-speed (if supported)
1045 */
1046 err = mmc_sd_switch_hs(card);
1047 if (err > 0)
1048 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1049 else if (err)
1050 goto free_card;
1051
1052 /*
1053 * Set bus speed.
1054 */
1055 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1056
1057 /*
1058 * Switch to wider bus (if supported).
1059 */
1060 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1061 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1062 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1063 if (err)
1064 goto free_card;
1065
1066 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1067 }
1068 }
1069
1070 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1071 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1072 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1073 mmc_hostname(host));
1074 err = -EINVAL;
1075 goto free_card;
1076 }
1077 done:
1078 host->card = card;
1079 return 0;
1080
1081 free_card:
1082 if (!oldcard)
1083 mmc_remove_card(card);
1084
1085 return err;
1086 }
1087
1088 /*
1089 * Host is being removed. Free up the current card.
1090 */
1091 static void mmc_sd_remove(struct mmc_host *host)
1092 {
1093 mmc_remove_card(host->card);
1094 host->card = NULL;
1095 }
1096
1097 /*
1098 * Card detection - card is alive.
1099 */
1100 static int mmc_sd_alive(struct mmc_host *host)
1101 {
1102 return mmc_send_status(host->card, NULL);
1103 }
1104
1105 /*
1106 * Card detection callback from host.
1107 */
1108 static void mmc_sd_detect(struct mmc_host *host)
1109 {
1110 int err;
1111
1112 mmc_get_card(host->card, NULL);
1113
1114 /*
1115 * Just check if our card has been removed.
1116 */
1117 err = _mmc_detect_card_removed(host);
1118
1119 mmc_put_card(host->card, NULL);
1120
1121 if (err) {
1122 mmc_sd_remove(host);
1123
1124 mmc_claim_host(host);
1125 mmc_detach_bus(host);
1126 mmc_power_off(host);
1127 mmc_release_host(host);
1128 }
1129 }
1130
1131 static int _mmc_sd_suspend(struct mmc_host *host)
1132 {
1133 int err = 0;
1134
1135 mmc_claim_host(host);
1136
1137 if (mmc_card_suspended(host->card))
1138 goto out;
1139
1140 if (!mmc_host_is_spi(host))
1141 err = mmc_deselect_cards(host);
1142
1143 if (!err) {
1144 mmc_power_off(host);
1145 mmc_card_set_suspended(host->card);
1146 }
1147
1148 out:
1149 mmc_release_host(host);
1150 return err;
1151 }
1152
1153 /*
1154 * Callback for suspend
1155 */
1156 static int mmc_sd_suspend(struct mmc_host *host)
1157 {
1158 int err;
1159
1160 err = _mmc_sd_suspend(host);
1161 if (!err) {
1162 pm_runtime_disable(&host->card->dev);
1163 pm_runtime_set_suspended(&host->card->dev);
1164 }
1165
1166 return err;
1167 }
1168
1169 /*
1170 * This function tries to determine if the same card is still present
1171 * and, if so, restore all state to it.
1172 */
1173 static int _mmc_sd_resume(struct mmc_host *host)
1174 {
1175 int err = 0;
1176
1177 mmc_claim_host(host);
1178
1179 if (!mmc_card_suspended(host->card))
1180 goto out;
1181
1182 mmc_power_up(host, host->card->ocr);
1183 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1184 mmc_card_clr_suspended(host->card);
1185
1186 out:
1187 mmc_release_host(host);
1188 return err;
1189 }
1190
1191 /*
1192 * Callback for resume
1193 */
1194 static int mmc_sd_resume(struct mmc_host *host)
1195 {
1196 pm_runtime_enable(&host->card->dev);
1197 return 0;
1198 }
1199
1200 /*
1201 * Callback for runtime_suspend.
1202 */
1203 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1204 {
1205 int err;
1206
1207 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1208 return 0;
1209
1210 err = _mmc_sd_suspend(host);
1211 if (err)
1212 pr_err("%s: error %d doing aggressive suspend\n",
1213 mmc_hostname(host), err);
1214
1215 return err;
1216 }
1217
1218 /*
1219 * Callback for runtime_resume.
1220 */
1221 static int mmc_sd_runtime_resume(struct mmc_host *host)
1222 {
1223 int err;
1224
1225 err = _mmc_sd_resume(host);
1226 if (err && err != -ENOMEDIUM)
1227 pr_err("%s: error %d doing runtime resume\n",
1228 mmc_hostname(host), err);
1229
1230 return 0;
1231 }
1232
1233 static int mmc_sd_hw_reset(struct mmc_host *host)
1234 {
1235 mmc_power_cycle(host, host->card->ocr);
1236 return mmc_sd_init_card(host, host->card->ocr, host->card);
1237 }
1238
1239 static const struct mmc_bus_ops mmc_sd_ops = {
1240 .remove = mmc_sd_remove,
1241 .detect = mmc_sd_detect,
1242 .runtime_suspend = mmc_sd_runtime_suspend,
1243 .runtime_resume = mmc_sd_runtime_resume,
1244 .suspend = mmc_sd_suspend,
1245 .resume = mmc_sd_resume,
1246 .alive = mmc_sd_alive,
1247 .shutdown = mmc_sd_suspend,
1248 .hw_reset = mmc_sd_hw_reset,
1249 };
1250
1251 /*
1252 * Starting point for SD card init.
1253 */
1254 int mmc_attach_sd(struct mmc_host *host)
1255 {
1256 int err;
1257 u32 ocr, rocr;
1258
1259 WARN_ON(!host->claimed);
1260
1261 err = mmc_send_app_op_cond(host, 0, &ocr);
1262 if (err)
1263 return err;
1264
1265 mmc_attach_bus(host, &mmc_sd_ops);
1266 if (host->ocr_avail_sd)
1267 host->ocr_avail = host->ocr_avail_sd;
1268
1269 /*
1270 * We need to get OCR a different way for SPI.
1271 */
1272 if (mmc_host_is_spi(host)) {
1273 mmc_go_idle(host);
1274
1275 err = mmc_spi_read_ocr(host, 0, &ocr);
1276 if (err)
1277 goto err;
1278 }
1279
1280 /*
1281 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1282 * these bits as being in-valid and especially also bit7.
1283 */
1284 ocr &= ~0x7FFF;
1285
1286 rocr = mmc_select_voltage(host, ocr);
1287
1288 /*
1289 * Can we support the voltage(s) of the card(s)?
1290 */
1291 if (!rocr) {
1292 err = -EINVAL;
1293 goto err;
1294 }
1295
1296 /*
1297 * Detect and init the card.
1298 */
1299 err = mmc_sd_init_card(host, rocr, NULL);
1300 if (err)
1301 goto err;
1302
1303 mmc_release_host(host);
1304 err = mmc_add_card(host->card);
1305 if (err)
1306 goto remove_card;
1307
1308 mmc_claim_host(host);
1309 return 0;
1310
1311 remove_card:
1312 mmc_remove_card(host->card);
1313 host->card = NULL;
1314 mmc_claim_host(host);
1315 err:
1316 mmc_detach_bus(host);
1317
1318 pr_err("%s: error %d whilst initialising SD card\n",
1319 mmc_hostname(host), err);
1320
1321 return err;
1322 }
Linux with added FPC-III support