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Merge remote-tracking branch 'keys/keys-next'
[deliverable/linux.git] / drivers / mmc / core / sd.c
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 */
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 */
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 */
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 */
223 static int mmc_read_ssr(struct mmc_card *card)
224 {
225 unsigned int au, es, et, eo;
226 int i;
227
228 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
229 pr_warn("%s: card lacks mandatory SD Status function\n",
230 mmc_hostname(card->host));
231 return 0;
232 }
233
234 if (mmc_app_sd_status(card, card->raw_ssr)) {
235 pr_warn("%s: problem reading SD Status register\n",
236 mmc_hostname(card->host));
237 return 0;
238 }
239
240 for (i = 0; i < 16; i++)
241 card->raw_ssr[i] = be32_to_cpu(card->raw_ssr[i]);
242
243 /*
244 * UNSTUFF_BITS only works with four u32s so we have to offset the
245 * bitfield positions accordingly.
246 */
247 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
248 if (au) {
249 if (au <= 9 || card->scr.sda_spec3) {
250 card->ssr.au = sd_au_size[au];
251 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
252 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
253 if (es && et) {
254 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
255 card->ssr.erase_timeout = (et * 1000) / es;
256 card->ssr.erase_offset = eo * 1000;
257 }
258 } else {
259 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
260 mmc_hostname(card->host));
261 }
262 }
263
264 return 0;
265 }
266
267 /*
268 * Fetches and decodes switch information
269 */
270 static int mmc_read_switch(struct mmc_card *card)
271 {
272 int err;
273 u8 *status;
274
275 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
276 return 0;
277
278 if (!(card->csd.cmdclass & CCC_SWITCH)) {
279 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
280 mmc_hostname(card->host));
281 return 0;
282 }
283
284 err = -EIO;
285
286 status = kmalloc(64, GFP_KERNEL);
287 if (!status) {
288 pr_err("%s: could not allocate a buffer for "
289 "switch capabilities.\n",
290 mmc_hostname(card->host));
291 return -ENOMEM;
292 }
293
294 /*
295 * Find out the card's support bits with a mode 0 operation.
296 * The argument does not matter, as the support bits do not
297 * change with the arguments.
298 */
299 err = mmc_sd_switch(card, 0, 0, 0, status);
300 if (err) {
301 /*
302 * If the host or the card can't do the switch,
303 * fail more gracefully.
304 */
305 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
306 goto out;
307
308 pr_warn("%s: problem reading Bus Speed modes\n",
309 mmc_hostname(card->host));
310 err = 0;
311
312 goto out;
313 }
314
315 if (status[13] & SD_MODE_HIGH_SPEED)
316 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
317
318 if (card->scr.sda_spec3) {
319 card->sw_caps.sd3_bus_mode = status[13];
320 /* Driver Strengths supported by the card */
321 card->sw_caps.sd3_drv_type = status[9];
322 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
323 }
324
325 out:
326 kfree(status);
327
328 return err;
329 }
330
331 /*
332 * Test if the card supports high-speed mode and, if so, switch to it.
333 */
334 int mmc_sd_switch_hs(struct mmc_card *card)
335 {
336 int err;
337 u8 *status;
338
339 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
340 return 0;
341
342 if (!(card->csd.cmdclass & CCC_SWITCH))
343 return 0;
344
345 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
346 return 0;
347
348 if (card->sw_caps.hs_max_dtr == 0)
349 return 0;
350
351 status = kmalloc(64, GFP_KERNEL);
352 if (!status) {
353 pr_err("%s: could not allocate a buffer for "
354 "switch capabilities.\n", mmc_hostname(card->host));
355 return -ENOMEM;
356 }
357
358 err = mmc_sd_switch(card, 1, 0, 1, status);
359 if (err)
360 goto out;
361
362 if ((status[16] & 0xF) != 1) {
363 pr_warn("%s: Problem switching card into high-speed mode!\n",
364 mmc_hostname(card->host));
365 err = 0;
366 } else {
367 err = 1;
368 }
369
370 out:
371 kfree(status);
372
373 return err;
374 }
375
376 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
377 {
378 int card_drv_type, drive_strength, drv_type;
379 int err;
380
381 card->drive_strength = 0;
382
383 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
384
385 drive_strength = mmc_select_drive_strength(card,
386 card->sw_caps.uhs_max_dtr,
387 card_drv_type, &drv_type);
388
389 if (drive_strength) {
390 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
391 if (err)
392 return err;
393 if ((status[15] & 0xF) != drive_strength) {
394 pr_warn("%s: Problem setting drive strength!\n",
395 mmc_hostname(card->host));
396 return 0;
397 }
398 card->drive_strength = drive_strength;
399 }
400
401 if (drv_type)
402 mmc_set_driver_type(card->host, drv_type);
403
404 return 0;
405 }
406
407 static void sd_update_bus_speed_mode(struct mmc_card *card)
408 {
409 /*
410 * If the host doesn't support any of the UHS-I modes, fallback on
411 * default speed.
412 */
413 if (!mmc_host_uhs(card->host)) {
414 card->sd_bus_speed = 0;
415 return;
416 }
417
418 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
419 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
420 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
421 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
422 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
423 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
424 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
425 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
426 SD_MODE_UHS_SDR50)) {
427 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
428 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
429 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
430 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
431 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
432 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
433 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
434 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
435 SD_MODE_UHS_SDR12)) {
436 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
437 }
438 }
439
440 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
441 {
442 int err;
443 unsigned int timing = 0;
444
445 switch (card->sd_bus_speed) {
446 case UHS_SDR104_BUS_SPEED:
447 timing = MMC_TIMING_UHS_SDR104;
448 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
449 break;
450 case UHS_DDR50_BUS_SPEED:
451 timing = MMC_TIMING_UHS_DDR50;
452 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
453 break;
454 case UHS_SDR50_BUS_SPEED:
455 timing = MMC_TIMING_UHS_SDR50;
456 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
457 break;
458 case UHS_SDR25_BUS_SPEED:
459 timing = MMC_TIMING_UHS_SDR25;
460 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
461 break;
462 case UHS_SDR12_BUS_SPEED:
463 timing = MMC_TIMING_UHS_SDR12;
464 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
465 break;
466 default:
467 return 0;
468 }
469
470 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
471 if (err)
472 return err;
473
474 if ((status[16] & 0xF) != card->sd_bus_speed)
475 pr_warn("%s: Problem setting bus speed mode!\n",
476 mmc_hostname(card->host));
477 else {
478 mmc_set_timing(card->host, timing);
479 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
480 }
481
482 return 0;
483 }
484
485 /* Get host's max current setting at its current voltage */
486 static u32 sd_get_host_max_current(struct mmc_host *host)
487 {
488 u32 voltage, max_current;
489
490 voltage = 1 << host->ios.vdd;
491 switch (voltage) {
492 case MMC_VDD_165_195:
493 max_current = host->max_current_180;
494 break;
495 case MMC_VDD_29_30:
496 case MMC_VDD_30_31:
497 max_current = host->max_current_300;
498 break;
499 case MMC_VDD_32_33:
500 case MMC_VDD_33_34:
501 max_current = host->max_current_330;
502 break;
503 default:
504 max_current = 0;
505 }
506
507 return max_current;
508 }
509
510 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
511 {
512 int current_limit = SD_SET_CURRENT_NO_CHANGE;
513 int err;
514 u32 max_current;
515
516 /*
517 * Current limit switch is only defined for SDR50, SDR104, and DDR50
518 * bus speed modes. For other bus speed modes, we do not change the
519 * current limit.
520 */
521 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
522 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
523 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
524 return 0;
525
526 /*
527 * Host has different current capabilities when operating at
528 * different voltages, so find out its max current first.
529 */
530 max_current = sd_get_host_max_current(card->host);
531
532 /*
533 * We only check host's capability here, if we set a limit that is
534 * higher than the card's maximum current, the card will be using its
535 * maximum current, e.g. if the card's maximum current is 300ma, and
536 * when we set current limit to 200ma, the card will draw 200ma, and
537 * when we set current limit to 400/600/800ma, the card will draw its
538 * maximum 300ma from the host.
539 *
540 * The above is incorrect: if we try to set a current limit that is
541 * not supported by the card, the card can rightfully error out the
542 * attempt, and remain at the default current limit. This results
543 * in a 300mA card being limited to 200mA even though the host
544 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
545 * an iMX6 host. --rmk
546 */
547 if (max_current >= 800 &&
548 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
549 current_limit = SD_SET_CURRENT_LIMIT_800;
550 else if (max_current >= 600 &&
551 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
552 current_limit = SD_SET_CURRENT_LIMIT_600;
553 else if (max_current >= 400 &&
554 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
555 current_limit = SD_SET_CURRENT_LIMIT_400;
556 else if (max_current >= 200 &&
557 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
558 current_limit = SD_SET_CURRENT_LIMIT_200;
559
560 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
561 err = mmc_sd_switch(card, 1, 3, current_limit, status);
562 if (err)
563 return err;
564
565 if (((status[15] >> 4) & 0x0F) != current_limit)
566 pr_warn("%s: Problem setting current limit!\n",
567 mmc_hostname(card->host));
568
569 }
570
571 return 0;
572 }
573
574 /*
575 * UHS-I specific initialization procedure
576 */
577 static int mmc_sd_init_uhs_card(struct mmc_card *card)
578 {
579 int err;
580 u8 *status;
581
582 if (!card->scr.sda_spec3)
583 return 0;
584
585 if (!(card->csd.cmdclass & CCC_SWITCH))
586 return 0;
587
588 status = kmalloc(64, GFP_KERNEL);
589 if (!status) {
590 pr_err("%s: could not allocate a buffer for "
591 "switch capabilities.\n", mmc_hostname(card->host));
592 return -ENOMEM;
593 }
594
595 /* Set 4-bit bus width */
596 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
597 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
598 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
599 if (err)
600 goto out;
601
602 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
603 }
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, "%08x\n", card->ocr);
679
680
681 static ssize_t mmc_dsr_show(struct device *dev,
682 struct device_attribute *attr,
683 char *buf)
684 {
685 struct mmc_card *card = mmc_dev_to_card(dev);
686 struct mmc_host *host = card->host;
687
688 if (card->csd.dsr_imp && host->dsr_req)
689 return sprintf(buf, "0x%x\n", host->dsr);
690 else
691 /* return default DSR value */
692 return sprintf(buf, "0x%x\n", 0x404);
693 }
694
695 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
696
697 static struct attribute *sd_std_attrs[] = {
698 &dev_attr_cid.attr,
699 &dev_attr_csd.attr,
700 &dev_attr_scr.attr,
701 &dev_attr_ssr.attr,
702 &dev_attr_date.attr,
703 &dev_attr_erase_size.attr,
704 &dev_attr_preferred_erase_size.attr,
705 &dev_attr_fwrev.attr,
706 &dev_attr_hwrev.attr,
707 &dev_attr_manfid.attr,
708 &dev_attr_name.attr,
709 &dev_attr_oemid.attr,
710 &dev_attr_serial.attr,
711 &dev_attr_ocr.attr,
712 &dev_attr_dsr.attr,
713 NULL,
714 };
715 ATTRIBUTE_GROUPS(sd_std);
716
717 struct device_type sd_type = {
718 .groups = sd_std_groups,
719 };
720
721 /*
722 * Fetch CID from card.
723 */
724 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
725 {
726 int err;
727 u32 max_current;
728 int retries = 10;
729 u32 pocr = ocr;
730
731 try_again:
732 if (!retries) {
733 ocr &= ~SD_OCR_S18R;
734 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
735 }
736
737 /*
738 * Since we're changing the OCR value, we seem to
739 * need to tell some cards to go back to the idle
740 * state. We wait 1ms to give cards time to
741 * respond.
742 */
743 mmc_go_idle(host);
744
745 /*
746 * If SD_SEND_IF_COND indicates an SD 2.0
747 * compliant card and we should set bit 30
748 * of the ocr to indicate that we can handle
749 * block-addressed SDHC cards.
750 */
751 err = mmc_send_if_cond(host, ocr);
752 if (!err)
753 ocr |= SD_OCR_CCS;
754
755 /*
756 * If the host supports one of UHS-I modes, request the card
757 * to switch to 1.8V signaling level. If the card has failed
758 * repeatedly to switch however, skip this.
759 */
760 if (retries && mmc_host_uhs(host))
761 ocr |= SD_OCR_S18R;
762
763 /*
764 * If the host can supply more than 150mA at current voltage,
765 * XPC should be set to 1.
766 */
767 max_current = sd_get_host_max_current(host);
768 if (max_current > 150)
769 ocr |= SD_OCR_XPC;
770
771 err = mmc_send_app_op_cond(host, ocr, rocr);
772 if (err)
773 return err;
774
775 /*
776 * In case CCS and S18A in the response is set, start Signal Voltage
777 * Switch procedure. SPI mode doesn't support CMD11.
778 */
779 if (!mmc_host_is_spi(host) && rocr &&
780 ((*rocr & 0x41000000) == 0x41000000)) {
781 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
782 pocr);
783 if (err == -EAGAIN) {
784 retries--;
785 goto try_again;
786 } else if (err) {
787 retries = 0;
788 goto try_again;
789 }
790 }
791
792 if (mmc_host_is_spi(host))
793 err = mmc_send_cid(host, cid);
794 else
795 err = mmc_all_send_cid(host, cid);
796
797 return err;
798 }
799
800 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
801 {
802 int err;
803
804 /*
805 * Fetch CSD from card.
806 */
807 err = mmc_send_csd(card, card->raw_csd);
808 if (err)
809 return err;
810
811 err = mmc_decode_csd(card);
812 if (err)
813 return err;
814
815 return 0;
816 }
817
818 static int mmc_sd_get_ro(struct mmc_host *host)
819 {
820 int ro;
821
822 /*
823 * Some systems don't feature a write-protect pin and don't need one.
824 * E.g. because they only have micro-SD card slot. For those systems
825 * assume that the SD card is always read-write.
826 */
827 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
828 return 0;
829
830 if (!host->ops->get_ro)
831 return -1;
832
833 ro = host->ops->get_ro(host);
834
835 return ro;
836 }
837
838 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
839 bool reinit)
840 {
841 int err;
842
843 if (!reinit) {
844 /*
845 * Fetch SCR from card.
846 */
847 err = mmc_app_send_scr(card, card->raw_scr);
848 if (err)
849 return err;
850
851 err = mmc_decode_scr(card);
852 if (err)
853 return err;
854
855 /*
856 * Fetch and process SD Status register.
857 */
858 err = mmc_read_ssr(card);
859 if (err)
860 return err;
861
862 /* Erase init depends on CSD and SSR */
863 mmc_init_erase(card);
864
865 /*
866 * Fetch switch information from card.
867 */
868 err = mmc_read_switch(card);
869 if (err)
870 return err;
871 }
872
873 /*
874 * For SPI, enable CRC as appropriate.
875 * This CRC enable is located AFTER the reading of the
876 * card registers because some SDHC cards are not able
877 * to provide valid CRCs for non-512-byte blocks.
878 */
879 if (mmc_host_is_spi(host)) {
880 err = mmc_spi_set_crc(host, use_spi_crc);
881 if (err)
882 return err;
883 }
884
885 /*
886 * Check if read-only switch is active.
887 */
888 if (!reinit) {
889 int ro = mmc_sd_get_ro(host);
890
891 if (ro < 0) {
892 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
893 mmc_hostname(host));
894 } else if (ro > 0) {
895 mmc_card_set_readonly(card);
896 }
897 }
898
899 return 0;
900 }
901
902 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
903 {
904 unsigned max_dtr = (unsigned int)-1;
905
906 if (mmc_card_hs(card)) {
907 if (max_dtr > card->sw_caps.hs_max_dtr)
908 max_dtr = card->sw_caps.hs_max_dtr;
909 } else if (max_dtr > card->csd.max_dtr) {
910 max_dtr = card->csd.max_dtr;
911 }
912
913 return max_dtr;
914 }
915
916 /*
917 * Handle the detection and initialisation of a card.
918 *
919 * In the case of a resume, "oldcard" will contain the card
920 * we're trying to reinitialise.
921 */
922 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
923 struct mmc_card *oldcard)
924 {
925 struct mmc_card *card;
926 int err;
927 u32 cid[4];
928 u32 rocr = 0;
929
930 BUG_ON(!host);
931 WARN_ON(!host->claimed);
932
933 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
934 if (err)
935 return err;
936
937 if (oldcard) {
938 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
939 return -ENOENT;
940
941 card = oldcard;
942 } else {
943 /*
944 * Allocate card structure.
945 */
946 card = mmc_alloc_card(host, &sd_type);
947 if (IS_ERR(card))
948 return PTR_ERR(card);
949
950 card->ocr = ocr;
951 card->type = MMC_TYPE_SD;
952 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
953 }
954
955 /*
956 * Call the optional HC's init_card function to handle quirks.
957 */
958 if (host->ops->init_card)
959 host->ops->init_card(host, card);
960
961 /*
962 * For native busses: get card RCA and quit open drain mode.
963 */
964 if (!mmc_host_is_spi(host)) {
965 err = mmc_send_relative_addr(host, &card->rca);
966 if (err)
967 goto free_card;
968 }
969
970 if (!oldcard) {
971 err = mmc_sd_get_csd(host, card);
972 if (err)
973 goto free_card;
974
975 mmc_decode_cid(card);
976 }
977
978 /*
979 * handling only for cards supporting DSR and hosts requesting
980 * DSR configuration
981 */
982 if (card->csd.dsr_imp && host->dsr_req)
983 mmc_set_dsr(host);
984
985 /*
986 * Select card, as all following commands rely on that.
987 */
988 if (!mmc_host_is_spi(host)) {
989 err = mmc_select_card(card);
990 if (err)
991 goto free_card;
992 }
993
994 err = mmc_sd_setup_card(host, card, oldcard != NULL);
995 if (err)
996 goto free_card;
997
998 /* Initialization sequence for UHS-I cards */
999 if (rocr & SD_ROCR_S18A) {
1000 err = mmc_sd_init_uhs_card(card);
1001 if (err)
1002 goto free_card;
1003 } else {
1004 /*
1005 * Attempt to change to high-speed (if supported)
1006 */
1007 err = mmc_sd_switch_hs(card);
1008 if (err > 0)
1009 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1010 else if (err)
1011 goto free_card;
1012
1013 /*
1014 * Set bus speed.
1015 */
1016 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1017
1018 /*
1019 * Switch to wider bus (if supported).
1020 */
1021 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1022 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1023 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1024 if (err)
1025 goto free_card;
1026
1027 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1028 }
1029 }
1030
1031 host->card = card;
1032 return 0;
1033
1034 free_card:
1035 if (!oldcard)
1036 mmc_remove_card(card);
1037
1038 return err;
1039 }
1040
1041 /*
1042 * Host is being removed. Free up the current card.
1043 */
1044 static void mmc_sd_remove(struct mmc_host *host)
1045 {
1046 BUG_ON(!host);
1047 BUG_ON(!host->card);
1048
1049 mmc_remove_card(host->card);
1050 host->card = NULL;
1051 }
1052
1053 /*
1054 * Card detection - card is alive.
1055 */
1056 static int mmc_sd_alive(struct mmc_host *host)
1057 {
1058 return mmc_send_status(host->card, NULL);
1059 }
1060
1061 /*
1062 * Card detection callback from host.
1063 */
1064 static void mmc_sd_detect(struct mmc_host *host)
1065 {
1066 int err;
1067
1068 BUG_ON(!host);
1069 BUG_ON(!host->card);
1070
1071 mmc_get_card(host->card);
1072
1073 /*
1074 * Just check if our card has been removed.
1075 */
1076 err = _mmc_detect_card_removed(host);
1077
1078 mmc_put_card(host->card);
1079
1080 if (err) {
1081 mmc_sd_remove(host);
1082
1083 mmc_claim_host(host);
1084 mmc_detach_bus(host);
1085 mmc_power_off(host);
1086 mmc_release_host(host);
1087 }
1088 }
1089
1090 static int _mmc_sd_suspend(struct mmc_host *host)
1091 {
1092 int err = 0;
1093
1094 BUG_ON(!host);
1095 BUG_ON(!host->card);
1096
1097 mmc_claim_host(host);
1098
1099 if (mmc_card_suspended(host->card))
1100 goto out;
1101
1102 if (!mmc_host_is_spi(host))
1103 err = mmc_deselect_cards(host);
1104
1105 if (!err) {
1106 mmc_power_off(host);
1107 mmc_card_set_suspended(host->card);
1108 }
1109
1110 out:
1111 mmc_release_host(host);
1112 return err;
1113 }
1114
1115 /*
1116 * Callback for suspend
1117 */
1118 static int mmc_sd_suspend(struct mmc_host *host)
1119 {
1120 int err;
1121
1122 err = _mmc_sd_suspend(host);
1123 if (!err) {
1124 pm_runtime_disable(&host->card->dev);
1125 pm_runtime_set_suspended(&host->card->dev);
1126 }
1127
1128 return err;
1129 }
1130
1131 /*
1132 * This function tries to determine if the same card is still present
1133 * and, if so, restore all state to it.
1134 */
1135 static int _mmc_sd_resume(struct mmc_host *host)
1136 {
1137 int err = 0;
1138
1139 BUG_ON(!host);
1140 BUG_ON(!host->card);
1141
1142 mmc_claim_host(host);
1143
1144 if (!mmc_card_suspended(host->card))
1145 goto out;
1146
1147 mmc_power_up(host, host->card->ocr);
1148 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1149 mmc_card_clr_suspended(host->card);
1150
1151 out:
1152 mmc_release_host(host);
1153 return err;
1154 }
1155
1156 /*
1157 * Callback for resume
1158 */
1159 static int mmc_sd_resume(struct mmc_host *host)
1160 {
1161 pm_runtime_enable(&host->card->dev);
1162 return 0;
1163 }
1164
1165 /*
1166 * Callback for runtime_suspend.
1167 */
1168 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1169 {
1170 int err;
1171
1172 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1173 return 0;
1174
1175 err = _mmc_sd_suspend(host);
1176 if (err)
1177 pr_err("%s: error %d doing aggressive suspend\n",
1178 mmc_hostname(host), err);
1179
1180 return err;
1181 }
1182
1183 /*
1184 * Callback for runtime_resume.
1185 */
1186 static int mmc_sd_runtime_resume(struct mmc_host *host)
1187 {
1188 int err;
1189
1190 err = _mmc_sd_resume(host);
1191 if (err && err != -ENOMEDIUM)
1192 pr_err("%s: error %d doing runtime resume\n",
1193 mmc_hostname(host), err);
1194
1195 return 0;
1196 }
1197
1198 static int mmc_sd_reset(struct mmc_host *host)
1199 {
1200 mmc_power_cycle(host, host->card->ocr);
1201 return mmc_sd_init_card(host, host->card->ocr, host->card);
1202 }
1203
1204 static const struct mmc_bus_ops mmc_sd_ops = {
1205 .remove = mmc_sd_remove,
1206 .detect = mmc_sd_detect,
1207 .runtime_suspend = mmc_sd_runtime_suspend,
1208 .runtime_resume = mmc_sd_runtime_resume,
1209 .suspend = mmc_sd_suspend,
1210 .resume = mmc_sd_resume,
1211 .alive = mmc_sd_alive,
1212 .shutdown = mmc_sd_suspend,
1213 .reset = mmc_sd_reset,
1214 };
1215
1216 /*
1217 * Starting point for SD card init.
1218 */
1219 int mmc_attach_sd(struct mmc_host *host)
1220 {
1221 int err;
1222 u32 ocr, rocr;
1223
1224 BUG_ON(!host);
1225 WARN_ON(!host->claimed);
1226
1227 err = mmc_send_app_op_cond(host, 0, &ocr);
1228 if (err)
1229 return err;
1230
1231 mmc_attach_bus(host, &mmc_sd_ops);
1232 if (host->ocr_avail_sd)
1233 host->ocr_avail = host->ocr_avail_sd;
1234
1235 /*
1236 * We need to get OCR a different way for SPI.
1237 */
1238 if (mmc_host_is_spi(host)) {
1239 mmc_go_idle(host);
1240
1241 err = mmc_spi_read_ocr(host, 0, &ocr);
1242 if (err)
1243 goto err;
1244 }
1245
1246 rocr = mmc_select_voltage(host, ocr);
1247
1248 /*
1249 * Can we support the voltage(s) of the card(s)?
1250 */
1251 if (!rocr) {
1252 err = -EINVAL;
1253 goto err;
1254 }
1255
1256 /*
1257 * Detect and init the card.
1258 */
1259 err = mmc_sd_init_card(host, rocr, NULL);
1260 if (err)
1261 goto err;
1262
1263 mmc_release_host(host);
1264 err = mmc_add_card(host->card);
1265 if (err)
1266 goto remove_card;
1267
1268 mmc_claim_host(host);
1269 return 0;
1270
1271 remove_card:
1272 mmc_remove_card(host->card);
1273 host->card = NULL;
1274 mmc_claim_host(host);
1275 err:
1276 mmc_detach_bus(host);
1277
1278 pr_err("%s: error %d whilst initialising SD card\n",
1279 mmc_hostname(host), err);
1280
1281 return err;
1282 }
Linux kernel - Deliverables
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