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posix-clock: Fix return code on the poll method's error path
[linux/fpc-iii.git] / drivers / mmc / core / sd.c
blob141eaa923e18eecc140039d34604d5f2969c023b
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 status = kmalloc(64, GFP_KERNEL);
361 if (!status) {
362 pr_err("%s: could not allocate a buffer for "
363 "switch capabilities.\n", mmc_hostname(card->host));
364 return -ENOMEM;
365 }
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 if (max_current >= 800)
550 current_limit = SD_SET_CURRENT_LIMIT_800;
551 else if (max_current >= 600)
552 current_limit = SD_SET_CURRENT_LIMIT_600;
553 else if (max_current >= 400)
554 current_limit = SD_SET_CURRENT_LIMIT_400;
555 else if (max_current >= 200)
556 current_limit = SD_SET_CURRENT_LIMIT_200;
557
558 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
559 err = mmc_sd_switch(card, 1, 3, current_limit, status);
560 if (err)
561 return err;
562
563 if (((status[15] >> 4) & 0x0F) != current_limit)
564 pr_warn("%s: Problem setting current limit!\n",
565 mmc_hostname(card->host));
566
567 }
568
569 return 0;
570 }
571
572 /*
573 * UHS-I specific initialization procedure
574 */
575 static int mmc_sd_init_uhs_card(struct mmc_card *card)
576 {
577 int err;
578 u8 *status;
579
580 if (!card->scr.sda_spec3)
581 return 0;
582
583 if (!(card->csd.cmdclass & CCC_SWITCH))
584 return 0;
585
586 status = kmalloc(64, GFP_KERNEL);
587 if (!status) {
588 pr_err("%s: could not allocate a buffer for "
589 "switch capabilities.\n", mmc_hostname(card->host));
590 return -ENOMEM;
591 }
592
593 /* Set 4-bit bus width */
594 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
595 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
596 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
597 if (err)
598 goto out;
599
600 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
601 }
602
603 /*
604 * Select the bus speed mode depending on host
605 * and card capability.
606 */
607 sd_update_bus_speed_mode(card);
608
609 /* Set the driver strength for the card */
610 err = sd_select_driver_type(card, status);
611 if (err)
612 goto out;
613
614 /* Set current limit for the card */
615 err = sd_set_current_limit(card, status);
616 if (err)
617 goto out;
618
619 /* Set bus speed mode of the card */
620 err = sd_set_bus_speed_mode(card, status);
621 if (err)
622 goto out;
623
624 /*
625 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
626 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
627 */
628 if (!mmc_host_is_spi(card->host) &&
629 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED ||
630 card->sd_bus_speed == UHS_DDR50_BUS_SPEED ||
631 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) {
632 err = mmc_execute_tuning(card);
633
634 /*
635 * As SD Specifications Part1 Physical Layer Specification
636 * Version 3.01 says, CMD19 tuning is available for unlocked
637 * cards in transfer state of 1.8V signaling mode. The small
638 * difference between v3.00 and 3.01 spec means that CMD19
639 * tuning is also available for DDR50 mode.
640 */
641 if (err && card->sd_bus_speed == UHS_DDR50_BUS_SPEED) {
642 pr_warn("%s: ddr50 tuning failed\n",
643 mmc_hostname(card->host));
644 err = 0;
645 }
646 }
647
648 out:
649 kfree(status);
650
651 return err;
652 }
653
654 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
655 card->raw_cid[2], card->raw_cid[3]);
656 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
657 card->raw_csd[2], card->raw_csd[3]);
658 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
659 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
660 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
661 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
662 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
663 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
664 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
665 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
666 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
667 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
668
669
670 static struct attribute *sd_std_attrs[] = {
671 &dev_attr_cid.attr,
672 &dev_attr_csd.attr,
673 &dev_attr_scr.attr,
674 &dev_attr_date.attr,
675 &dev_attr_erase_size.attr,
676 &dev_attr_preferred_erase_size.attr,
677 &dev_attr_fwrev.attr,
678 &dev_attr_hwrev.attr,
679 &dev_attr_manfid.attr,
680 &dev_attr_name.attr,
681 &dev_attr_oemid.attr,
682 &dev_attr_serial.attr,
683 NULL,
684 };
685 ATTRIBUTE_GROUPS(sd_std);
686
687 struct device_type sd_type = {
688 .groups = sd_std_groups,
689 };
690
691 /*
692 * Fetch CID from card.
693 */
694 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
695 {
696 int err;
697 u32 max_current;
698 int retries = 10;
699 u32 pocr = ocr;
700
701 try_again:
702 if (!retries) {
703 ocr &= ~SD_OCR_S18R;
704 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
705 }
706
707 /*
708 * Since we're changing the OCR value, we seem to
709 * need to tell some cards to go back to the idle
710 * state. We wait 1ms to give cards time to
711 * respond.
712 */
713 mmc_go_idle(host);
714
715 /*
716 * If SD_SEND_IF_COND indicates an SD 2.0
717 * compliant card and we should set bit 30
718 * of the ocr to indicate that we can handle
719 * block-addressed SDHC cards.
720 */
721 err = mmc_send_if_cond(host, ocr);
722 if (!err)
723 ocr |= SD_OCR_CCS;
724
725 /*
726 * If the host supports one of UHS-I modes, request the card
727 * to switch to 1.8V signaling level. If the card has failed
728 * repeatedly to switch however, skip this.
729 */
730 if (retries && mmc_host_uhs(host))
731 ocr |= SD_OCR_S18R;
732
733 /*
734 * If the host can supply more than 150mA at current voltage,
735 * XPC should be set to 1.
736 */
737 max_current = sd_get_host_max_current(host);
738 if (max_current > 150)
739 ocr |= SD_OCR_XPC;
740
741 err = mmc_send_app_op_cond(host, ocr, rocr);
742 if (err)
743 return err;
744
745 /*
746 * In case CCS and S18A in the response is set, start Signal Voltage
747 * Switch procedure. SPI mode doesn't support CMD11.
748 */
749 if (!mmc_host_is_spi(host) && rocr &&
750 ((*rocr & 0x41000000) == 0x41000000)) {
751 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
752 pocr);
753 if (err == -EAGAIN) {
754 retries--;
755 goto try_again;
756 } else if (err) {
757 retries = 0;
758 goto try_again;
759 }
760 }
761
762 if (mmc_host_is_spi(host))
763 err = mmc_send_cid(host, cid);
764 else
765 err = mmc_all_send_cid(host, cid);
766
767 return err;
768 }
769
770 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
771 {
772 int err;
773
774 /*
775 * Fetch CSD from card.
776 */
777 err = mmc_send_csd(card, card->raw_csd);
778 if (err)
779 return err;
780
781 err = mmc_decode_csd(card);
782 if (err)
783 return err;
784
785 return 0;
786 }
787
788 static int mmc_sd_get_ro(struct mmc_host *host)
789 {
790 int ro;
791
792 /*
793 * Some systems don't feature a write-protect pin and don't need one.
794 * E.g. because they only have micro-SD card slot. For those systems
795 * assume that the SD card is always read-write.
796 */
797 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
798 return 0;
799
800 if (!host->ops->get_ro)
801 return -1;
802
803 ro = host->ops->get_ro(host);
804
805 return ro;
806 }
807
808 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
809 bool reinit)
810 {
811 int err;
812
813 if (!reinit) {
814 /*
815 * Fetch SCR from card.
816 */
817 err = mmc_app_send_scr(card, card->raw_scr);
818 if (err)
819 return err;
820
821 err = mmc_decode_scr(card);
822 if (err)
823 return err;
824
825 /*
826 * Fetch and process SD Status register.
827 */
828 err = mmc_read_ssr(card);
829 if (err)
830 return err;
831
832 /* Erase init depends on CSD and SSR */
833 mmc_init_erase(card);
834
835 /*
836 * Fetch switch information from card.
837 */
838 err = mmc_read_switch(card);
839 if (err)
840 return err;
841 }
842
843 /*
844 * For SPI, enable CRC as appropriate.
845 * This CRC enable is located AFTER the reading of the
846 * card registers because some SDHC cards are not able
847 * to provide valid CRCs for non-512-byte blocks.
848 */
849 if (mmc_host_is_spi(host)) {
850 err = mmc_spi_set_crc(host, use_spi_crc);
851 if (err)
852 return err;
853 }
854
855 /*
856 * Check if read-only switch is active.
857 */
858 if (!reinit) {
859 int ro = mmc_sd_get_ro(host);
860
861 if (ro < 0) {
862 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
863 mmc_hostname(host));
864 } else if (ro > 0) {
865 mmc_card_set_readonly(card);
866 }
867 }
868
869 return 0;
870 }
871
872 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
873 {
874 unsigned max_dtr = (unsigned int)-1;
875
876 if (mmc_card_hs(card)) {
877 if (max_dtr > card->sw_caps.hs_max_dtr)
878 max_dtr = card->sw_caps.hs_max_dtr;
879 } else if (max_dtr > card->csd.max_dtr) {
880 max_dtr = card->csd.max_dtr;
881 }
882
883 return max_dtr;
884 }
885
886 /*
887 * Handle the detection and initialisation of a card.
888 *
889 * In the case of a resume, "oldcard" will contain the card
890 * we're trying to reinitialise.
891 */
892 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
893 struct mmc_card *oldcard)
894 {
895 struct mmc_card *card;
896 int err;
897 u32 cid[4];
898 u32 rocr = 0;
899
900 BUG_ON(!host);
901 WARN_ON(!host->claimed);
902
903 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
904 if (err)
905 return err;
906
907 if (oldcard) {
908 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
909 return -ENOENT;
910
911 card = oldcard;
912 } else {
913 /*
914 * Allocate card structure.
915 */
916 card = mmc_alloc_card(host, &sd_type);
917 if (IS_ERR(card))
918 return PTR_ERR(card);
919
920 card->ocr = ocr;
921 card->type = MMC_TYPE_SD;
922 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
923 }
924
925 /*
926 * Call the optional HC's init_card function to handle quirks.
927 */
928 if (host->ops->init_card)
929 host->ops->init_card(host, card);
930
931 /*
932 * For native busses: get card RCA and quit open drain mode.
933 */
934 if (!mmc_host_is_spi(host)) {
935 err = mmc_send_relative_addr(host, &card->rca);
936 if (err)
937 goto free_card;
938 }
939
940 if (!oldcard) {
941 err = mmc_sd_get_csd(host, card);
942 if (err)
943 goto free_card;
944
945 mmc_decode_cid(card);
946 }
947
948 /*
949 * handling only for cards supporting DSR and hosts requesting
950 * DSR configuration
951 */
952 if (card->csd.dsr_imp && host->dsr_req)
953 mmc_set_dsr(host);
954
955 /*
956 * Select card, as all following commands rely on that.
957 */
958 if (!mmc_host_is_spi(host)) {
959 err = mmc_select_card(card);
960 if (err)
961 goto free_card;
962 }
963
964 err = mmc_sd_setup_card(host, card, oldcard != NULL);
965 if (err)
966 goto free_card;
967
968 /* Initialization sequence for UHS-I cards */
969 if (rocr & SD_ROCR_S18A) {
970 err = mmc_sd_init_uhs_card(card);
971 if (err)
972 goto free_card;
973 } else {
974 /*
975 * Attempt to change to high-speed (if supported)
976 */
977 err = mmc_sd_switch_hs(card);
978 if (err > 0)
979 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
980 else if (err)
981 goto free_card;
982
983 /*
984 * Set bus speed.
985 */
986 mmc_set_clock(host, mmc_sd_get_max_clock(card));
987
988 /*
989 * Switch to wider bus (if supported).
990 */
991 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
992 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
993 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
994 if (err)
995 goto free_card;
996
997 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
998 }
999 }
1000
1001 host->card = card;
1002 return 0;
1003
1004 free_card:
1005 if (!oldcard)
1006 mmc_remove_card(card);
1007
1008 return err;
1009 }
1010
1011 /*
1012 * Host is being removed. Free up the current card.
1013 */
1014 static void mmc_sd_remove(struct mmc_host *host)
1015 {
1016 BUG_ON(!host);
1017 BUG_ON(!host->card);
1018
1019 mmc_remove_card(host->card);
1020 host->card = NULL;
1021 }
1022
1023 /*
1024 * Card detection - card is alive.
1025 */
1026 static int mmc_sd_alive(struct mmc_host *host)
1027 {
1028 return mmc_send_status(host->card, NULL);
1029 }
1030
1031 /*
1032 * Card detection callback from host.
1033 */
1034 static void mmc_sd_detect(struct mmc_host *host)
1035 {
1036 int err;
1037
1038 BUG_ON(!host);
1039 BUG_ON(!host->card);
1040
1041 mmc_get_card(host->card);
1042
1043 /*
1044 * Just check if our card has been removed.
1045 */
1046 err = _mmc_detect_card_removed(host);
1047
1048 mmc_put_card(host->card);
1049
1050 if (err) {
1051 mmc_sd_remove(host);
1052
1053 mmc_claim_host(host);
1054 mmc_detach_bus(host);
1055 mmc_power_off(host);
1056 mmc_release_host(host);
1057 }
1058 }
1059
1060 static int _mmc_sd_suspend(struct mmc_host *host)
1061 {
1062 int err = 0;
1063
1064 BUG_ON(!host);
1065 BUG_ON(!host->card);
1066
1067 mmc_claim_host(host);
1068
1069 if (mmc_card_suspended(host->card))
1070 goto out;
1071
1072 if (!mmc_host_is_spi(host))
1073 err = mmc_deselect_cards(host);
1074
1075 if (!err) {
1076 mmc_power_off(host);
1077 mmc_card_set_suspended(host->card);
1078 }
1079
1080 out:
1081 mmc_release_host(host);
1082 return err;
1083 }
1084
1085 /*
1086 * Callback for suspend
1087 */
1088 static int mmc_sd_suspend(struct mmc_host *host)
1089 {
1090 int err;
1091
1092 err = _mmc_sd_suspend(host);
1093 if (!err) {
1094 pm_runtime_disable(&host->card->dev);
1095 pm_runtime_set_suspended(&host->card->dev);
1096 }
1097
1098 return err;
1099 }
1100
1101 /*
1102 * This function tries to determine if the same card is still present
1103 * and, if so, restore all state to it.
1104 */
1105 static int _mmc_sd_resume(struct mmc_host *host)
1106 {
1107 int err = 0;
1108
1109 BUG_ON(!host);
1110 BUG_ON(!host->card);
1111
1112 mmc_claim_host(host);
1113
1114 if (!mmc_card_suspended(host->card))
1115 goto out;
1116
1117 mmc_power_up(host, host->card->ocr);
1118 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1119 mmc_card_clr_suspended(host->card);
1120
1121 out:
1122 mmc_release_host(host);
1123 return err;
1124 }
1125
1126 /*
1127 * Callback for resume
1128 */
1129 static int mmc_sd_resume(struct mmc_host *host)
1130 {
1131 int err = 0;
1132
1133 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1134 err = _mmc_sd_resume(host);
1135 pm_runtime_set_active(&host->card->dev);
1136 pm_runtime_mark_last_busy(&host->card->dev);
1137 }
1138 pm_runtime_enable(&host->card->dev);
1139
1140 return err;
1141 }
1142
1143 /*
1144 * Callback for runtime_suspend.
1145 */
1146 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1147 {
1148 int err;
1149
1150 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1151 return 0;
1152
1153 err = _mmc_sd_suspend(host);
1154 if (err)
1155 pr_err("%s: error %d doing aggressive suspend\n",
1156 mmc_hostname(host), err);
1157
1158 return err;
1159 }
1160
1161 /*
1162 * Callback for runtime_resume.
1163 */
1164 static int mmc_sd_runtime_resume(struct mmc_host *host)
1165 {
1166 int err;
1167
1168 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1169 return 0;
1170
1171 err = _mmc_sd_resume(host);
1172 if (err)
1173 pr_err("%s: error %d doing aggressive resume\n",
1174 mmc_hostname(host), err);
1175
1176 return 0;
1177 }
1178
1179 static int mmc_sd_reset(struct mmc_host *host)
1180 {
1181 mmc_power_cycle(host, host->card->ocr);
1182 return mmc_sd_init_card(host, host->card->ocr, host->card);
1183 }
1184
1185 static const struct mmc_bus_ops mmc_sd_ops = {
1186 .remove = mmc_sd_remove,
1187 .detect = mmc_sd_detect,
1188 .runtime_suspend = mmc_sd_runtime_suspend,
1189 .runtime_resume = mmc_sd_runtime_resume,
1190 .suspend = mmc_sd_suspend,
1191 .resume = mmc_sd_resume,
1192 .alive = mmc_sd_alive,
1193 .shutdown = mmc_sd_suspend,
1194 .reset = mmc_sd_reset,
1195 };
1196
1197 /*
1198 * Starting point for SD card init.
1199 */
1200 int mmc_attach_sd(struct mmc_host *host)
1201 {
1202 int err;
1203 u32 ocr, rocr;
1204
1205 BUG_ON(!host);
1206 WARN_ON(!host->claimed);
1207
1208 err = mmc_send_app_op_cond(host, 0, &ocr);
1209 if (err)
1210 return err;
1211
1212 mmc_attach_bus(host, &mmc_sd_ops);
1213 if (host->ocr_avail_sd)
1214 host->ocr_avail = host->ocr_avail_sd;
1215
1216 /*
1217 * We need to get OCR a different way for SPI.
1218 */
1219 if (mmc_host_is_spi(host)) {
1220 mmc_go_idle(host);
1221
1222 err = mmc_spi_read_ocr(host, 0, &ocr);
1223 if (err)
1224 goto err;
1225 }
1226
1227 rocr = mmc_select_voltage(host, ocr);
1228
1229 /*
1230 * Can we support the voltage(s) of the card(s)?
1231 */
1232 if (!rocr) {
1233 err = -EINVAL;
1234 goto err;
1235 }
1236
1237 /*
1238 * Detect and init the card.
1239 */
1240 err = mmc_sd_init_card(host, rocr, NULL);
1241 if (err)
1242 goto err;
1243
1244 mmc_release_host(host);
1245 err = mmc_add_card(host->card);
1246 if (err)
1247 goto remove_card;
1248
1249 mmc_claim_host(host);
1250 return 0;
1251
1252 remove_card:
1253 mmc_remove_card(host->card);
1254 host->card = NULL;
1255 mmc_claim_host(host);
1256 err:
1257 mmc_detach_bus(host);
1258
1259 pr_err("%s: error %d whilst initialising SD card\n",
1260 mmc_hostname(host), err);
1261
1262 return err;
1263 }
Linux with added FPC-III support