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mmc: core: Remove redundant ->power_restore() callback for SD
[linux/fpc-iii.git] / drivers / mmc / core / sd.c
blob4e7366ab187f295faab7674b72bf83fc8fb49ba4
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 memset(&card->cid, 0, sizeof(struct mmc_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->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
115 csd->tacc_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->tacc_ns = 0; /* Unused */
152 csd->tacc_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 return 0;
220 }
221
222 /*
223 * Fetch and process SD Status register.
224 */
225 static int mmc_read_ssr(struct mmc_card *card)
226 {
227 unsigned int au, es, et, eo;
228 int err, i;
229 u32 *ssr;
230
231 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
232 pr_warn("%s: card lacks mandatory SD Status function\n",
233 mmc_hostname(card->host));
234 return 0;
235 }
236
237 ssr = kmalloc(64, GFP_KERNEL);
238 if (!ssr)
239 return -ENOMEM;
240
241 err = mmc_app_sd_status(card, ssr);
242 if (err) {
243 pr_warn("%s: problem reading SD Status register\n",
244 mmc_hostname(card->host));
245 err = 0;
246 goto out;
247 }
248
249 for (i = 0; i < 16; i++)
250 ssr[i] = be32_to_cpu(ssr[i]);
251
252 /*
253 * UNSTUFF_BITS only works with four u32s so we have to offset the
254 * bitfield positions accordingly.
255 */
256 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
257 if (au) {
258 if (au <= 9 || card->scr.sda_spec3) {
259 card->ssr.au = sd_au_size[au];
260 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
261 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
262 if (es && et) {
263 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
264 card->ssr.erase_timeout = (et * 1000) / es;
265 card->ssr.erase_offset = eo * 1000;
266 }
267 } else {
268 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
269 mmc_hostname(card->host));
270 }
271 }
272 out:
273 kfree(ssr);
274 return err;
275 }
276
277 /*
278 * Fetches and decodes switch information
279 */
280 static int mmc_read_switch(struct mmc_card *card)
281 {
282 int err;
283 u8 *status;
284
285 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
286 return 0;
287
288 if (!(card->csd.cmdclass & CCC_SWITCH)) {
289 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
290 mmc_hostname(card->host));
291 return 0;
292 }
293
294 err = -EIO;
295
296 status = kmalloc(64, GFP_KERNEL);
297 if (!status) {
298 pr_err("%s: could not allocate a buffer for "
299 "switch capabilities.\n",
300 mmc_hostname(card->host));
301 return -ENOMEM;
302 }
303
304 /*
305 * Find out the card's support bits with a mode 0 operation.
306 * The argument does not matter, as the support bits do not
307 * change with the arguments.
308 */
309 err = mmc_sd_switch(card, 0, 0, 0, status);
310 if (err) {
311 /*
312 * If the host or the card can't do the switch,
313 * fail more gracefully.
314 */
315 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
316 goto out;
317
318 pr_warn("%s: problem reading Bus Speed modes\n",
319 mmc_hostname(card->host));
320 err = 0;
321
322 goto out;
323 }
324
325 if (status[13] & SD_MODE_HIGH_SPEED)
326 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
327
328 if (card->scr.sda_spec3) {
329 card->sw_caps.sd3_bus_mode = status[13];
330 /* Driver Strengths supported by the card */
331 card->sw_caps.sd3_drv_type = status[9];
332 }
333
334 out:
335 kfree(status);
336
337 return err;
338 }
339
340 /*
341 * Test if the card supports high-speed mode and, if so, switch to it.
342 */
343 int mmc_sd_switch_hs(struct mmc_card *card)
344 {
345 int err;
346 u8 *status;
347
348 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
349 return 0;
350
351 if (!(card->csd.cmdclass & CCC_SWITCH))
352 return 0;
353
354 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
355 return 0;
356
357 if (card->sw_caps.hs_max_dtr == 0)
358 return 0;
359
360 err = -EIO;
361
362 status = kmalloc(64, GFP_KERNEL);
363 if (!status) {
364 pr_err("%s: could not allocate a buffer for "
365 "switch capabilities.\n", mmc_hostname(card->host));
366 return -ENOMEM;
367 }
368
369 err = mmc_sd_switch(card, 1, 0, 1, status);
370 if (err)
371 goto out;
372
373 if ((status[16] & 0xF) != 1) {
374 pr_warn("%s: Problem switching card into high-speed mode!\n",
375 mmc_hostname(card->host));
376 err = 0;
377 } else {
378 err = 1;
379 }
380
381 out:
382 kfree(status);
383
384 return err;
385 }
386
387 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
388 {
389 int card_drv_type, drive_strength, drv_type;
390 int err;
391
392 card->drive_strength = 0;
393
394 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
395
396 drive_strength = mmc_select_drive_strength(card,
397 card->sw_caps.uhs_max_dtr,
398 card_drv_type, &drv_type);
399
400 if (drive_strength) {
401 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
402 if (err)
403 return err;
404 if ((status[15] & 0xF) != drive_strength) {
405 pr_warn("%s: Problem setting drive strength!\n",
406 mmc_hostname(card->host));
407 return 0;
408 }
409 card->drive_strength = drive_strength;
410 }
411
412 if (drv_type)
413 mmc_set_driver_type(card->host, drv_type);
414
415 return 0;
416 }
417
418 static void sd_update_bus_speed_mode(struct mmc_card *card)
419 {
420 /*
421 * If the host doesn't support any of the UHS-I modes, fallback on
422 * default speed.
423 */
424 if (!mmc_host_uhs(card->host)) {
425 card->sd_bus_speed = 0;
426 return;
427 }
428
429 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
430 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
431 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
432 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
433 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
434 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
435 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
436 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
437 SD_MODE_UHS_SDR50)) {
438 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
439 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
440 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
441 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
442 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
443 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
444 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
445 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
446 SD_MODE_UHS_SDR12)) {
447 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
448 }
449 }
450
451 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
452 {
453 int err;
454 unsigned int timing = 0;
455
456 switch (card->sd_bus_speed) {
457 case UHS_SDR104_BUS_SPEED:
458 timing = MMC_TIMING_UHS_SDR104;
459 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
460 break;
461 case UHS_DDR50_BUS_SPEED:
462 timing = MMC_TIMING_UHS_DDR50;
463 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
464 break;
465 case UHS_SDR50_BUS_SPEED:
466 timing = MMC_TIMING_UHS_SDR50;
467 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
468 break;
469 case UHS_SDR25_BUS_SPEED:
470 timing = MMC_TIMING_UHS_SDR25;
471 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
472 break;
473 case UHS_SDR12_BUS_SPEED:
474 timing = MMC_TIMING_UHS_SDR12;
475 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
476 break;
477 default:
478 return 0;
479 }
480
481 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
482 if (err)
483 return err;
484
485 if ((status[16] & 0xF) != card->sd_bus_speed)
486 pr_warn("%s: Problem setting bus speed mode!\n",
487 mmc_hostname(card->host));
488 else {
489 mmc_set_timing(card->host, timing);
490 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
491 }
492
493 return 0;
494 }
495
496 /* Get host's max current setting at its current voltage */
497 static u32 sd_get_host_max_current(struct mmc_host *host)
498 {
499 u32 voltage, max_current;
500
501 voltage = 1 << host->ios.vdd;
502 switch (voltage) {
503 case MMC_VDD_165_195:
504 max_current = host->max_current_180;
505 break;
506 case MMC_VDD_29_30:
507 case MMC_VDD_30_31:
508 max_current = host->max_current_300;
509 break;
510 case MMC_VDD_32_33:
511 case MMC_VDD_33_34:
512 max_current = host->max_current_330;
513 break;
514 default:
515 max_current = 0;
516 }
517
518 return max_current;
519 }
520
521 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
522 {
523 int current_limit = SD_SET_CURRENT_NO_CHANGE;
524 int err;
525 u32 max_current;
526
527 /*
528 * Current limit switch is only defined for SDR50, SDR104, and DDR50
529 * bus speed modes. For other bus speed modes, we do not change the
530 * current limit.
531 */
532 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
533 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
534 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
535 return 0;
536
537 /*
538 * Host has different current capabilities when operating at
539 * different voltages, so find out its max current first.
540 */
541 max_current = sd_get_host_max_current(card->host);
542
543 /*
544 * We only check host's capability here, if we set a limit that is
545 * higher than the card's maximum current, the card will be using its
546 * maximum current, e.g. if the card's maximum current is 300ma, and
547 * when we set current limit to 200ma, the card will draw 200ma, and
548 * when we set current limit to 400/600/800ma, the card will draw its
549 * maximum 300ma from the host.
550 */
551 if (max_current >= 800)
552 current_limit = SD_SET_CURRENT_LIMIT_800;
553 else if (max_current >= 600)
554 current_limit = SD_SET_CURRENT_LIMIT_600;
555 else if (max_current >= 400)
556 current_limit = SD_SET_CURRENT_LIMIT_400;
557 else if (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->sd_bus_speed == UHS_SDR50_BUS_SPEED ||
632 card->sd_bus_speed == UHS_SDR104_BUS_SPEED))
633 err = mmc_execute_tuning(card);
634 out:
635 kfree(status);
636
637 return err;
638 }
639
640 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
641 card->raw_cid[2], card->raw_cid[3]);
642 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
643 card->raw_csd[2], card->raw_csd[3]);
644 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
645 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
646 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
647 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
648 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
649 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
650 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
651 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
652 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
653 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
654
655
656 static struct attribute *sd_std_attrs[] = {
657 &dev_attr_cid.attr,
658 &dev_attr_csd.attr,
659 &dev_attr_scr.attr,
660 &dev_attr_date.attr,
661 &dev_attr_erase_size.attr,
662 &dev_attr_preferred_erase_size.attr,
663 &dev_attr_fwrev.attr,
664 &dev_attr_hwrev.attr,
665 &dev_attr_manfid.attr,
666 &dev_attr_name.attr,
667 &dev_attr_oemid.attr,
668 &dev_attr_serial.attr,
669 NULL,
670 };
671 ATTRIBUTE_GROUPS(sd_std);
672
673 struct device_type sd_type = {
674 .groups = sd_std_groups,
675 };
676
677 /*
678 * Fetch CID from card.
679 */
680 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
681 {
682 int err;
683 u32 max_current;
684 int retries = 10;
685 u32 pocr = ocr;
686
687 try_again:
688 if (!retries) {
689 ocr &= ~SD_OCR_S18R;
690 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
691 }
692
693 /*
694 * Since we're changing the OCR value, we seem to
695 * need to tell some cards to go back to the idle
696 * state. We wait 1ms to give cards time to
697 * respond.
698 */
699 mmc_go_idle(host);
700
701 /*
702 * If SD_SEND_IF_COND indicates an SD 2.0
703 * compliant card and we should set bit 30
704 * of the ocr to indicate that we can handle
705 * block-addressed SDHC cards.
706 */
707 err = mmc_send_if_cond(host, ocr);
708 if (!err)
709 ocr |= SD_OCR_CCS;
710
711 /*
712 * If the host supports one of UHS-I modes, request the card
713 * to switch to 1.8V signaling level. If the card has failed
714 * repeatedly to switch however, skip this.
715 */
716 if (retries && mmc_host_uhs(host))
717 ocr |= SD_OCR_S18R;
718
719 /*
720 * If the host can supply more than 150mA at current voltage,
721 * XPC should be set to 1.
722 */
723 max_current = sd_get_host_max_current(host);
724 if (max_current > 150)
725 ocr |= SD_OCR_XPC;
726
727 err = mmc_send_app_op_cond(host, ocr, rocr);
728 if (err)
729 return err;
730
731 /*
732 * In case CCS and S18A in the response is set, start Signal Voltage
733 * Switch procedure. SPI mode doesn't support CMD11.
734 */
735 if (!mmc_host_is_spi(host) && rocr &&
736 ((*rocr & 0x41000000) == 0x41000000)) {
737 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
738 pocr);
739 if (err == -EAGAIN) {
740 retries--;
741 goto try_again;
742 } else if (err) {
743 retries = 0;
744 goto try_again;
745 }
746 }
747
748 if (mmc_host_is_spi(host))
749 err = mmc_send_cid(host, cid);
750 else
751 err = mmc_all_send_cid(host, cid);
752
753 return err;
754 }
755
756 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
757 {
758 int err;
759
760 /*
761 * Fetch CSD from card.
762 */
763 err = mmc_send_csd(card, card->raw_csd);
764 if (err)
765 return err;
766
767 err = mmc_decode_csd(card);
768 if (err)
769 return err;
770
771 return 0;
772 }
773
774 static int mmc_sd_get_ro(struct mmc_host *host)
775 {
776 int ro;
777
778 /*
779 * Some systems don't feature a write-protect pin and don't need one.
780 * E.g. because they only have micro-SD card slot. For those systems
781 * assume that the SD card is always read-write.
782 */
783 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
784 return 0;
785
786 if (!host->ops->get_ro)
787 return -1;
788
789 mmc_host_clk_hold(host);
790 ro = host->ops->get_ro(host);
791 mmc_host_clk_release(host);
792
793 return ro;
794 }
795
796 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
797 bool reinit)
798 {
799 int err;
800
801 if (!reinit) {
802 /*
803 * Fetch SCR from card.
804 */
805 err = mmc_app_send_scr(card, card->raw_scr);
806 if (err)
807 return err;
808
809 err = mmc_decode_scr(card);
810 if (err)
811 return err;
812
813 /*
814 * Fetch and process SD Status register.
815 */
816 err = mmc_read_ssr(card);
817 if (err)
818 return err;
819
820 /* Erase init depends on CSD and SSR */
821 mmc_init_erase(card);
822
823 /*
824 * Fetch switch information from card.
825 */
826 err = mmc_read_switch(card);
827 if (err)
828 return err;
829 }
830
831 /*
832 * For SPI, enable CRC as appropriate.
833 * This CRC enable is located AFTER the reading of the
834 * card registers because some SDHC cards are not able
835 * to provide valid CRCs for non-512-byte blocks.
836 */
837 if (mmc_host_is_spi(host)) {
838 err = mmc_spi_set_crc(host, use_spi_crc);
839 if (err)
840 return err;
841 }
842
843 /*
844 * Check if read-only switch is active.
845 */
846 if (!reinit) {
847 int ro = mmc_sd_get_ro(host);
848
849 if (ro < 0) {
850 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
851 mmc_hostname(host));
852 } else if (ro > 0) {
853 mmc_card_set_readonly(card);
854 }
855 }
856
857 return 0;
858 }
859
860 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
861 {
862 unsigned max_dtr = (unsigned int)-1;
863
864 if (mmc_card_hs(card)) {
865 if (max_dtr > card->sw_caps.hs_max_dtr)
866 max_dtr = card->sw_caps.hs_max_dtr;
867 } else if (max_dtr > card->csd.max_dtr) {
868 max_dtr = card->csd.max_dtr;
869 }
870
871 return max_dtr;
872 }
873
874 /*
875 * Handle the detection and initialisation of a card.
876 *
877 * In the case of a resume, "oldcard" will contain the card
878 * we're trying to reinitialise.
879 */
880 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
881 struct mmc_card *oldcard)
882 {
883 struct mmc_card *card;
884 int err;
885 u32 cid[4];
886 u32 rocr = 0;
887
888 BUG_ON(!host);
889 WARN_ON(!host->claimed);
890
891 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
892 if (err)
893 return err;
894
895 if (oldcard) {
896 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
897 return -ENOENT;
898
899 card = oldcard;
900 } else {
901 /*
902 * Allocate card structure.
903 */
904 card = mmc_alloc_card(host, &sd_type);
905 if (IS_ERR(card))
906 return PTR_ERR(card);
907
908 card->ocr = ocr;
909 card->type = MMC_TYPE_SD;
910 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
911 }
912
913 /*
914 * Call the optional HC's init_card function to handle quirks.
915 */
916 if (host->ops->init_card)
917 host->ops->init_card(host, card);
918
919 /*
920 * For native busses: get card RCA and quit open drain mode.
921 */
922 if (!mmc_host_is_spi(host)) {
923 err = mmc_send_relative_addr(host, &card->rca);
924 if (err)
925 goto free_card;
926 }
927
928 if (!oldcard) {
929 err = mmc_sd_get_csd(host, card);
930 if (err)
931 goto free_card;
932
933 mmc_decode_cid(card);
934 }
935
936 /*
937 * handling only for cards supporting DSR and hosts requesting
938 * DSR configuration
939 */
940 if (card->csd.dsr_imp && host->dsr_req)
941 mmc_set_dsr(host);
942
943 /*
944 * Select card, as all following commands rely on that.
945 */
946 if (!mmc_host_is_spi(host)) {
947 err = mmc_select_card(card);
948 if (err)
949 goto free_card;
950 }
951
952 err = mmc_sd_setup_card(host, card, oldcard != NULL);
953 if (err)
954 goto free_card;
955
956 /* Initialization sequence for UHS-I cards */
957 if (rocr & SD_ROCR_S18A) {
958 err = mmc_sd_init_uhs_card(card);
959 if (err)
960 goto free_card;
961 } else {
962 /*
963 * Attempt to change to high-speed (if supported)
964 */
965 err = mmc_sd_switch_hs(card);
966 if (err > 0)
967 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
968 else if (err)
969 goto free_card;
970
971 /*
972 * Set bus speed.
973 */
974 mmc_set_clock(host, mmc_sd_get_max_clock(card));
975
976 /*
977 * Switch to wider bus (if supported).
978 */
979 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
980 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
981 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
982 if (err)
983 goto free_card;
984
985 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
986 }
987 }
988
989 host->card = card;
990 return 0;
991
992 free_card:
993 if (!oldcard)
994 mmc_remove_card(card);
995
996 return err;
997 }
998
999 /*
1000 * Host is being removed. Free up the current card.
1001 */
1002 static void mmc_sd_remove(struct mmc_host *host)
1003 {
1004 BUG_ON(!host);
1005 BUG_ON(!host->card);
1006
1007 mmc_remove_card(host->card);
1008 host->card = NULL;
1009 }
1010
1011 /*
1012 * Card detection - card is alive.
1013 */
1014 static int mmc_sd_alive(struct mmc_host *host)
1015 {
1016 return mmc_send_status(host->card, NULL);
1017 }
1018
1019 /*
1020 * Card detection callback from host.
1021 */
1022 static void mmc_sd_detect(struct mmc_host *host)
1023 {
1024 int err;
1025
1026 BUG_ON(!host);
1027 BUG_ON(!host->card);
1028
1029 mmc_get_card(host->card);
1030
1031 /*
1032 * Just check if our card has been removed.
1033 */
1034 err = _mmc_detect_card_removed(host);
1035
1036 mmc_put_card(host->card);
1037
1038 if (err) {
1039 mmc_sd_remove(host);
1040
1041 mmc_claim_host(host);
1042 mmc_detach_bus(host);
1043 mmc_power_off(host);
1044 mmc_release_host(host);
1045 }
1046 }
1047
1048 static int _mmc_sd_suspend(struct mmc_host *host)
1049 {
1050 int err = 0;
1051
1052 BUG_ON(!host);
1053 BUG_ON(!host->card);
1054
1055 mmc_claim_host(host);
1056
1057 if (mmc_card_suspended(host->card))
1058 goto out;
1059
1060 if (!mmc_host_is_spi(host))
1061 err = mmc_deselect_cards(host);
1062
1063 if (!err) {
1064 mmc_power_off(host);
1065 mmc_card_set_suspended(host->card);
1066 }
1067
1068 out:
1069 mmc_release_host(host);
1070 return err;
1071 }
1072
1073 /*
1074 * Callback for suspend
1075 */
1076 static int mmc_sd_suspend(struct mmc_host *host)
1077 {
1078 int err;
1079
1080 err = _mmc_sd_suspend(host);
1081 if (!err) {
1082 pm_runtime_disable(&host->card->dev);
1083 pm_runtime_set_suspended(&host->card->dev);
1084 }
1085
1086 return err;
1087 }
1088
1089 /*
1090 * This function tries to determine if the same card is still present
1091 * and, if so, restore all state to it.
1092 */
1093 static int _mmc_sd_resume(struct mmc_host *host)
1094 {
1095 int err = 0;
1096
1097 BUG_ON(!host);
1098 BUG_ON(!host->card);
1099
1100 mmc_claim_host(host);
1101
1102 if (!mmc_card_suspended(host->card))
1103 goto out;
1104
1105 mmc_power_up(host, host->card->ocr);
1106 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1107 mmc_card_clr_suspended(host->card);
1108
1109 out:
1110 mmc_release_host(host);
1111 return err;
1112 }
1113
1114 /*
1115 * Callback for resume
1116 */
1117 static int mmc_sd_resume(struct mmc_host *host)
1118 {
1119 int err = 0;
1120
1121 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1122 err = _mmc_sd_resume(host);
1123 pm_runtime_set_active(&host->card->dev);
1124 pm_runtime_mark_last_busy(&host->card->dev);
1125 }
1126 pm_runtime_enable(&host->card->dev);
1127
1128 return err;
1129 }
1130
1131 /*
1132 * Callback for runtime_suspend.
1133 */
1134 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1135 {
1136 int err;
1137
1138 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1139 return 0;
1140
1141 err = _mmc_sd_suspend(host);
1142 if (err)
1143 pr_err("%s: error %d doing aggressive suspend\n",
1144 mmc_hostname(host), err);
1145
1146 return err;
1147 }
1148
1149 /*
1150 * Callback for runtime_resume.
1151 */
1152 static int mmc_sd_runtime_resume(struct mmc_host *host)
1153 {
1154 int err;
1155
1156 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1157 return 0;
1158
1159 err = _mmc_sd_resume(host);
1160 if (err)
1161 pr_err("%s: error %d doing aggressive resume\n",
1162 mmc_hostname(host), err);
1163
1164 return 0;
1165 }
1166
1167 static int mmc_sd_reset(struct mmc_host *host)
1168 {
1169 mmc_power_cycle(host, host->card->ocr);
1170 return mmc_sd_init_card(host, host->card->ocr, host->card);
1171 }
1172
1173 static const struct mmc_bus_ops mmc_sd_ops = {
1174 .remove = mmc_sd_remove,
1175 .detect = mmc_sd_detect,
1176 .runtime_suspend = mmc_sd_runtime_suspend,
1177 .runtime_resume = mmc_sd_runtime_resume,
1178 .suspend = mmc_sd_suspend,
1179 .resume = mmc_sd_resume,
1180 .alive = mmc_sd_alive,
1181 .shutdown = mmc_sd_suspend,
1182 .reset = mmc_sd_reset,
1183 };
1184
1185 /*
1186 * Starting point for SD card init.
1187 */
1188 int mmc_attach_sd(struct mmc_host *host)
1189 {
1190 int err;
1191 u32 ocr, rocr;
1192
1193 BUG_ON(!host);
1194 WARN_ON(!host->claimed);
1195
1196 err = mmc_send_app_op_cond(host, 0, &ocr);
1197 if (err)
1198 return err;
1199
1200 mmc_attach_bus(host, &mmc_sd_ops);
1201 if (host->ocr_avail_sd)
1202 host->ocr_avail = host->ocr_avail_sd;
1203
1204 /*
1205 * We need to get OCR a different way for SPI.
1206 */
1207 if (mmc_host_is_spi(host)) {
1208 mmc_go_idle(host);
1209
1210 err = mmc_spi_read_ocr(host, 0, &ocr);
1211 if (err)
1212 goto err;
1213 }
1214
1215 rocr = mmc_select_voltage(host, ocr);
1216
1217 /*
1218 * Can we support the voltage(s) of the card(s)?
1219 */
1220 if (!rocr) {
1221 err = -EINVAL;
1222 goto err;
1223 }
1224
1225 /*
1226 * Detect and init the card.
1227 */
1228 err = mmc_sd_init_card(host, rocr, NULL);
1229 if (err)
1230 goto err;
1231
1232 mmc_release_host(host);
1233 err = mmc_add_card(host->card);
1234 mmc_claim_host(host);
1235 if (err)
1236 goto remove_card;
1237
1238 return 0;
1239
1240 remove_card:
1241 mmc_release_host(host);
1242 mmc_remove_card(host->card);
1243 host->card = NULL;
1244 mmc_claim_host(host);
1245 err:
1246 mmc_detach_bus(host);
1247
1248 pr_err("%s: error %d whilst initialising SD card\n",
1249 mmc_hostname(host), err);
1250
1251 return err;
1252 }
Linux with added FPC-III support