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Linux 3.11-rc3
[cris-mirror.git] / drivers / mmc / core / sd.c
blob176d125f5b577c697f90396b0243258977239548
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/slab.h>
15 #include <linux/stat.h>
16
17 #include <linux/mmc/host.h>
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/mmc.h>
20 #include <linux/mmc/sd.h>
21
22 #include "core.h"
23 #include "bus.h"
24 #include "mmc_ops.h"
25 #include "sd.h"
26 #include "sd_ops.h"
27
28 static const unsigned int tran_exp[] = {
29 10000, 100000, 1000000, 10000000,
30 0, 0, 0, 0
31 };
32
33 static const unsigned char tran_mant[] = {
34 0, 10, 12, 13, 15, 20, 25, 30,
35 35, 40, 45, 50, 55, 60, 70, 80,
36 };
37
38 static const unsigned int tacc_exp[] = {
39 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
40 };
41
42 static const unsigned int tacc_mant[] = {
43 0, 10, 12, 13, 15, 20, 25, 30,
44 35, 40, 45, 50, 55, 60, 70, 80,
45 };
46
47 #define UNSTUFF_BITS(resp,start,size) \
48 ({ \
49 const int __size = size; \
50 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
51 const int __off = 3 - ((start) / 32); \
52 const int __shft = (start) & 31; \
53 u32 __res; \
54 \
55 __res = resp[__off] >> __shft; \
56 if (__size + __shft > 32) \
57 __res |= resp[__off-1] << ((32 - __shft) % 32); \
58 __res & __mask; \
59 })
60
61 /*
62 * Given the decoded CSD structure, decode the raw CID to our CID structure.
63 */
64 void mmc_decode_cid(struct mmc_card *card)
65 {
66 u32 *resp = card->raw_cid;
67
68 memset(&card->cid, 0, sizeof(struct mmc_cid));
69
70 /*
71 * SD doesn't currently have a version field so we will
72 * have to assume we can parse this.
73 */
74 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
75 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
76 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
77 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
78 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
79 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
80 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
81 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
82 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
83 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
84 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
85 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
86
87 card->cid.year += 2000; /* SD cards year offset */
88 }
89
90 /*
91 * Given a 128-bit response, decode to our card CSD structure.
92 */
93 static int mmc_decode_csd(struct mmc_card *card)
94 {
95 struct mmc_csd *csd = &card->csd;
96 unsigned int e, m, csd_struct;
97 u32 *resp = card->raw_csd;
98
99 csd_struct = UNSTUFF_BITS(resp, 126, 2);
100
101 switch (csd_struct) {
102 case 0:
103 m = UNSTUFF_BITS(resp, 115, 4);
104 e = UNSTUFF_BITS(resp, 112, 3);
105 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
106 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
107
108 m = UNSTUFF_BITS(resp, 99, 4);
109 e = UNSTUFF_BITS(resp, 96, 3);
110 csd->max_dtr = tran_exp[e] * tran_mant[m];
111 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
112
113 e = UNSTUFF_BITS(resp, 47, 3);
114 m = UNSTUFF_BITS(resp, 62, 12);
115 csd->capacity = (1 + m) << (e + 2);
116
117 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
118 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
119 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
120 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
121 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
122 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
123 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
124
125 if (UNSTUFF_BITS(resp, 46, 1)) {
126 csd->erase_size = 1;
127 } else if (csd->write_blkbits >= 9) {
128 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
129 csd->erase_size <<= csd->write_blkbits - 9;
130 }
131 break;
132 case 1:
133 /*
134 * This is a block-addressed SDHC or SDXC card. Most
135 * interesting fields are unused and have fixed
136 * values. To avoid getting tripped by buggy cards,
137 * we assume those fixed values ourselves.
138 */
139 mmc_card_set_blockaddr(card);
140
141 csd->tacc_ns = 0; /* Unused */
142 csd->tacc_clks = 0; /* Unused */
143
144 m = UNSTUFF_BITS(resp, 99, 4);
145 e = UNSTUFF_BITS(resp, 96, 3);
146 csd->max_dtr = tran_exp[e] * tran_mant[m];
147 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
148 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
149
150 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
151 if (csd->c_size >= 0xFFFF)
152 mmc_card_set_ext_capacity(card);
153
154 m = UNSTUFF_BITS(resp, 48, 22);
155 csd->capacity = (1 + m) << 10;
156
157 csd->read_blkbits = 9;
158 csd->read_partial = 0;
159 csd->write_misalign = 0;
160 csd->read_misalign = 0;
161 csd->r2w_factor = 4; /* Unused */
162 csd->write_blkbits = 9;
163 csd->write_partial = 0;
164 csd->erase_size = 1;
165 break;
166 default:
167 pr_err("%s: unrecognised CSD structure version %d\n",
168 mmc_hostname(card->host), csd_struct);
169 return -EINVAL;
170 }
171
172 card->erase_size = csd->erase_size;
173
174 return 0;
175 }
176
177 /*
178 * Given a 64-bit response, decode to our card SCR structure.
179 */
180 static int mmc_decode_scr(struct mmc_card *card)
181 {
182 struct sd_scr *scr = &card->scr;
183 unsigned int scr_struct;
184 u32 resp[4];
185
186 resp[3] = card->raw_scr[1];
187 resp[2] = card->raw_scr[0];
188
189 scr_struct = UNSTUFF_BITS(resp, 60, 4);
190 if (scr_struct != 0) {
191 pr_err("%s: unrecognised SCR structure version %d\n",
192 mmc_hostname(card->host), scr_struct);
193 return -EINVAL;
194 }
195
196 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
197 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
198 if (scr->sda_vsn == SCR_SPEC_VER_2)
199 /* Check if Physical Layer Spec v3.0 is supported */
200 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
201
202 if (UNSTUFF_BITS(resp, 55, 1))
203 card->erased_byte = 0xFF;
204 else
205 card->erased_byte = 0x0;
206
207 if (scr->sda_spec3)
208 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
209 return 0;
210 }
211
212 /*
213 * Fetch and process SD Status register.
214 */
215 static int mmc_read_ssr(struct mmc_card *card)
216 {
217 unsigned int au, es, et, eo;
218 int err, i;
219 u32 *ssr;
220
221 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
222 pr_warning("%s: card lacks mandatory SD Status "
223 "function.\n", mmc_hostname(card->host));
224 return 0;
225 }
226
227 ssr = kmalloc(64, GFP_KERNEL);
228 if (!ssr)
229 return -ENOMEM;
230
231 err = mmc_app_sd_status(card, ssr);
232 if (err) {
233 pr_warning("%s: problem reading SD Status "
234 "register.\n", mmc_hostname(card->host));
235 err = 0;
236 goto out;
237 }
238
239 for (i = 0; i < 16; i++)
240 ssr[i] = be32_to_cpu(ssr[i]);
241
242 /*
243 * UNSTUFF_BITS only works with four u32s so we have to offset the
244 * bitfield positions accordingly.
245 */
246 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
247 if (au > 0 && au <= 9) {
248 card->ssr.au = 1 << (au + 4);
249 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
250 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
251 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
252 if (es && et) {
253 card->ssr.erase_timeout = (et * 1000) / es;
254 card->ssr.erase_offset = eo * 1000;
255 }
256 } else {
257 pr_warning("%s: SD Status: Invalid Allocation Unit "
258 "size.\n", mmc_hostname(card->host));
259 }
260 out:
261 kfree(ssr);
262 return err;
263 }
264
265 /*
266 * Fetches and decodes switch information
267 */
268 static int mmc_read_switch(struct mmc_card *card)
269 {
270 int err;
271 u8 *status;
272
273 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
274 return 0;
275
276 if (!(card->csd.cmdclass & CCC_SWITCH)) {
277 pr_warning("%s: card lacks mandatory switch "
278 "function, performance might suffer.\n",
279 mmc_hostname(card->host));
280 return 0;
281 }
282
283 err = -EIO;
284
285 status = kmalloc(64, GFP_KERNEL);
286 if (!status) {
287 pr_err("%s: could not allocate a buffer for "
288 "switch capabilities.\n",
289 mmc_hostname(card->host));
290 return -ENOMEM;
291 }
292
293 /*
294 * Find out the card's support bits with a mode 0 operation.
295 * The argument does not matter, as the support bits do not
296 * change with the arguments.
297 */
298 err = mmc_sd_switch(card, 0, 0, 0, status);
299 if (err) {
300 /*
301 * If the host or the card can't do the switch,
302 * fail more gracefully.
303 */
304 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
305 goto out;
306
307 pr_warning("%s: problem reading Bus Speed modes.\n",
308 mmc_hostname(card->host));
309 err = 0;
310
311 goto out;
312 }
313
314 if (status[13] & SD_MODE_HIGH_SPEED)
315 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
316
317 if (card->scr.sda_spec3) {
318 card->sw_caps.sd3_bus_mode = status[13];
319 /* Driver Strengths supported by the card */
320 card->sw_caps.sd3_drv_type = status[9];
321 }
322
323 out:
324 kfree(status);
325
326 return err;
327 }
328
329 /*
330 * Test if the card supports high-speed mode and, if so, switch to it.
331 */
332 int mmc_sd_switch_hs(struct mmc_card *card)
333 {
334 int err;
335 u8 *status;
336
337 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
338 return 0;
339
340 if (!(card->csd.cmdclass & CCC_SWITCH))
341 return 0;
342
343 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
344 return 0;
345
346 if (card->sw_caps.hs_max_dtr == 0)
347 return 0;
348
349 err = -EIO;
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_warning("%s: Problem switching card "
364 "into high-speed mode!\n",
365 mmc_hostname(card->host));
366 err = 0;
367 } else {
368 err = 1;
369 }
370
371 out:
372 kfree(status);
373
374 return err;
375 }
376
377 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
378 {
379 int host_drv_type = SD_DRIVER_TYPE_B;
380 int card_drv_type = SD_DRIVER_TYPE_B;
381 int drive_strength;
382 int err;
383
384 /*
385 * If the host doesn't support any of the Driver Types A,C or D,
386 * or there is no board specific handler then default Driver
387 * Type B is used.
388 */
389 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
390 | MMC_CAP_DRIVER_TYPE_D)))
391 return 0;
392
393 if (!card->host->ops->select_drive_strength)
394 return 0;
395
396 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
397 host_drv_type |= SD_DRIVER_TYPE_A;
398
399 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
400 host_drv_type |= SD_DRIVER_TYPE_C;
401
402 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
403 host_drv_type |= SD_DRIVER_TYPE_D;
404
405 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
406 card_drv_type |= SD_DRIVER_TYPE_A;
407
408 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
409 card_drv_type |= SD_DRIVER_TYPE_C;
410
411 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
412 card_drv_type |= SD_DRIVER_TYPE_D;
413
414 /*
415 * The drive strength that the hardware can support
416 * depends on the board design. Pass the appropriate
417 * information and let the hardware specific code
418 * return what is possible given the options
419 */
420 mmc_host_clk_hold(card->host);
421 drive_strength = card->host->ops->select_drive_strength(
422 card->sw_caps.uhs_max_dtr,
423 host_drv_type, card_drv_type);
424 mmc_host_clk_release(card->host);
425
426 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
427 if (err)
428 return err;
429
430 if ((status[15] & 0xF) != drive_strength) {
431 pr_warning("%s: Problem setting drive strength!\n",
432 mmc_hostname(card->host));
433 return 0;
434 }
435
436 mmc_set_driver_type(card->host, drive_strength);
437
438 return 0;
439 }
440
441 static void sd_update_bus_speed_mode(struct mmc_card *card)
442 {
443 /*
444 * If the host doesn't support any of the UHS-I modes, fallback on
445 * default speed.
446 */
447 if (!mmc_host_uhs(card->host)) {
448 card->sd_bus_speed = 0;
449 return;
450 }
451
452 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
453 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
454 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
455 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
456 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
457 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
458 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
459 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
460 SD_MODE_UHS_SDR50)) {
461 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
462 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
463 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
464 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
465 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
466 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
467 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
468 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
469 SD_MODE_UHS_SDR12)) {
470 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
471 }
472 }
473
474 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
475 {
476 int err;
477 unsigned int timing = 0;
478
479 switch (card->sd_bus_speed) {
480 case UHS_SDR104_BUS_SPEED:
481 timing = MMC_TIMING_UHS_SDR104;
482 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
483 break;
484 case UHS_DDR50_BUS_SPEED:
485 timing = MMC_TIMING_UHS_DDR50;
486 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
487 break;
488 case UHS_SDR50_BUS_SPEED:
489 timing = MMC_TIMING_UHS_SDR50;
490 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
491 break;
492 case UHS_SDR25_BUS_SPEED:
493 timing = MMC_TIMING_UHS_SDR25;
494 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
495 break;
496 case UHS_SDR12_BUS_SPEED:
497 timing = MMC_TIMING_UHS_SDR12;
498 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
499 break;
500 default:
501 return 0;
502 }
503
504 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
505 if (err)
506 return err;
507
508 if ((status[16] & 0xF) != card->sd_bus_speed)
509 pr_warning("%s: Problem setting bus speed mode!\n",
510 mmc_hostname(card->host));
511 else {
512 mmc_set_timing(card->host, timing);
513 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
514 }
515
516 return 0;
517 }
518
519 /* Get host's max current setting at its current voltage */
520 static u32 sd_get_host_max_current(struct mmc_host *host)
521 {
522 u32 voltage, max_current;
523
524 voltage = 1 << host->ios.vdd;
525 switch (voltage) {
526 case MMC_VDD_165_195:
527 max_current = host->max_current_180;
528 break;
529 case MMC_VDD_29_30:
530 case MMC_VDD_30_31:
531 max_current = host->max_current_300;
532 break;
533 case MMC_VDD_32_33:
534 case MMC_VDD_33_34:
535 max_current = host->max_current_330;
536 break;
537 default:
538 max_current = 0;
539 }
540
541 return max_current;
542 }
543
544 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
545 {
546 int current_limit = SD_SET_CURRENT_NO_CHANGE;
547 int err;
548 u32 max_current;
549
550 /*
551 * Current limit switch is only defined for SDR50, SDR104, and DDR50
552 * bus speed modes. For other bus speed modes, we do not change the
553 * current limit.
554 */
555 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
556 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
557 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
558 return 0;
559
560 /*
561 * Host has different current capabilities when operating at
562 * different voltages, so find out its max current first.
563 */
564 max_current = sd_get_host_max_current(card->host);
565
566 /*
567 * We only check host's capability here, if we set a limit that is
568 * higher than the card's maximum current, the card will be using its
569 * maximum current, e.g. if the card's maximum current is 300ma, and
570 * when we set current limit to 200ma, the card will draw 200ma, and
571 * when we set current limit to 400/600/800ma, the card will draw its
572 * maximum 300ma from the host.
573 */
574 if (max_current >= 800)
575 current_limit = SD_SET_CURRENT_LIMIT_800;
576 else if (max_current >= 600)
577 current_limit = SD_SET_CURRENT_LIMIT_600;
578 else if (max_current >= 400)
579 current_limit = SD_SET_CURRENT_LIMIT_400;
580 else if (max_current >= 200)
581 current_limit = SD_SET_CURRENT_LIMIT_200;
582
583 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
584 err = mmc_sd_switch(card, 1, 3, current_limit, status);
585 if (err)
586 return err;
587
588 if (((status[15] >> 4) & 0x0F) != current_limit)
589 pr_warning("%s: Problem setting current limit!\n",
590 mmc_hostname(card->host));
591
592 }
593
594 return 0;
595 }
596
597 /*
598 * UHS-I specific initialization procedure
599 */
600 static int mmc_sd_init_uhs_card(struct mmc_card *card)
601 {
602 int err;
603 u8 *status;
604
605 if (!card->scr.sda_spec3)
606 return 0;
607
608 if (!(card->csd.cmdclass & CCC_SWITCH))
609 return 0;
610
611 status = kmalloc(64, GFP_KERNEL);
612 if (!status) {
613 pr_err("%s: could not allocate a buffer for "
614 "switch capabilities.\n", mmc_hostname(card->host));
615 return -ENOMEM;
616 }
617
618 /* Set 4-bit bus width */
619 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
620 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
621 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
622 if (err)
623 goto out;
624
625 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
626 }
627
628 /*
629 * Select the bus speed mode depending on host
630 * and card capability.
631 */
632 sd_update_bus_speed_mode(card);
633
634 /* Set the driver strength for the card */
635 err = sd_select_driver_type(card, status);
636 if (err)
637 goto out;
638
639 /* Set current limit for the card */
640 err = sd_set_current_limit(card, status);
641 if (err)
642 goto out;
643
644 /* Set bus speed mode of the card */
645 err = sd_set_bus_speed_mode(card, status);
646 if (err)
647 goto out;
648
649 /*
650 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
651 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
652 */
653 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning &&
654 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED ||
655 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) {
656 mmc_host_clk_hold(card->host);
657 err = card->host->ops->execute_tuning(card->host,
658 MMC_SEND_TUNING_BLOCK);
659 mmc_host_clk_release(card->host);
660 }
661
662 out:
663 kfree(status);
664
665 return err;
666 }
667
668 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
669 card->raw_cid[2], card->raw_cid[3]);
670 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
671 card->raw_csd[2], card->raw_csd[3]);
672 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
673 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
674 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
675 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
676 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
677 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
678 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
679 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
680 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
681 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
682
683
684 static struct attribute *sd_std_attrs[] = {
685 &dev_attr_cid.attr,
686 &dev_attr_csd.attr,
687 &dev_attr_scr.attr,
688 &dev_attr_date.attr,
689 &dev_attr_erase_size.attr,
690 &dev_attr_preferred_erase_size.attr,
691 &dev_attr_fwrev.attr,
692 &dev_attr_hwrev.attr,
693 &dev_attr_manfid.attr,
694 &dev_attr_name.attr,
695 &dev_attr_oemid.attr,
696 &dev_attr_serial.attr,
697 NULL,
698 };
699
700 static struct attribute_group sd_std_attr_group = {
701 .attrs = sd_std_attrs,
702 };
703
704 static const struct attribute_group *sd_attr_groups[] = {
705 &sd_std_attr_group,
706 NULL,
707 };
708
709 struct device_type sd_type = {
710 .groups = sd_attr_groups,
711 };
712
713 /*
714 * Fetch CID from card.
715 */
716 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
717 {
718 int err;
719 u32 max_current;
720 int retries = 10;
721
722 try_again:
723 if (!retries) {
724 ocr &= ~SD_OCR_S18R;
725 pr_warning("%s: Skipping voltage switch\n",
726 mmc_hostname(host));
727 }
728
729 /*
730 * Since we're changing the OCR value, we seem to
731 * need to tell some cards to go back to the idle
732 * state. We wait 1ms to give cards time to
733 * respond.
734 */
735 mmc_go_idle(host);
736
737 /*
738 * If SD_SEND_IF_COND indicates an SD 2.0
739 * compliant card and we should set bit 30
740 * of the ocr to indicate that we can handle
741 * block-addressed SDHC cards.
742 */
743 err = mmc_send_if_cond(host, ocr);
744 if (!err)
745 ocr |= SD_OCR_CCS;
746
747 /*
748 * If the host supports one of UHS-I modes, request the card
749 * to switch to 1.8V signaling level. If the card has failed
750 * repeatedly to switch however, skip this.
751 */
752 if (retries && mmc_host_uhs(host))
753 ocr |= SD_OCR_S18R;
754
755 /*
756 * If the host can supply more than 150mA at current voltage,
757 * XPC should be set to 1.
758 */
759 max_current = sd_get_host_max_current(host);
760 if (max_current > 150)
761 ocr |= SD_OCR_XPC;
762
763 err = mmc_send_app_op_cond(host, ocr, rocr);
764 if (err)
765 return err;
766
767 /*
768 * In case CCS and S18A in the response is set, start Signal Voltage
769 * Switch procedure. SPI mode doesn't support CMD11.
770 */
771 if (!mmc_host_is_spi(host) && rocr &&
772 ((*rocr & 0x41000000) == 0x41000000)) {
773 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
774 if (err == -EAGAIN) {
775 retries--;
776 goto try_again;
777 } else if (err) {
778 retries = 0;
779 goto try_again;
780 }
781 }
782
783 if (mmc_host_is_spi(host))
784 err = mmc_send_cid(host, cid);
785 else
786 err = mmc_all_send_cid(host, cid);
787
788 return err;
789 }
790
791 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
792 {
793 int err;
794
795 /*
796 * Fetch CSD from card.
797 */
798 err = mmc_send_csd(card, card->raw_csd);
799 if (err)
800 return err;
801
802 err = mmc_decode_csd(card);
803 if (err)
804 return err;
805
806 return 0;
807 }
808
809 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
810 bool reinit)
811 {
812 int err;
813
814 if (!reinit) {
815 /*
816 * Fetch SCR from card.
817 */
818 err = mmc_app_send_scr(card, card->raw_scr);
819 if (err)
820 return err;
821
822 err = mmc_decode_scr(card);
823 if (err)
824 return err;
825
826 /*
827 * Fetch and process SD Status register.
828 */
829 err = mmc_read_ssr(card);
830 if (err)
831 return err;
832
833 /* Erase init depends on CSD and SSR */
834 mmc_init_erase(card);
835
836 /*
837 * Fetch switch information from card.
838 */
839 err = mmc_read_switch(card);
840 if (err)
841 return err;
842 }
843
844 /*
845 * For SPI, enable CRC as appropriate.
846 * This CRC enable is located AFTER the reading of the
847 * card registers because some SDHC cards are not able
848 * to provide valid CRCs for non-512-byte blocks.
849 */
850 if (mmc_host_is_spi(host)) {
851 err = mmc_spi_set_crc(host, use_spi_crc);
852 if (err)
853 return err;
854 }
855
856 /*
857 * Check if read-only switch is active.
858 */
859 if (!reinit) {
860 int ro = -1;
861
862 if (host->ops->get_ro) {
863 mmc_host_clk_hold(card->host);
864 ro = host->ops->get_ro(host);
865 mmc_host_clk_release(card->host);
866 }
867
868 if (ro < 0) {
869 pr_warning("%s: host does not "
870 "support reading read-only "
871 "switch. assuming write-enable.\n",
872 mmc_hostname(host));
873 } else if (ro > 0) {
874 mmc_card_set_readonly(card);
875 }
876 }
877
878 return 0;
879 }
880
881 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
882 {
883 unsigned max_dtr = (unsigned int)-1;
884
885 if (mmc_card_highspeed(card)) {
886 if (max_dtr > card->sw_caps.hs_max_dtr)
887 max_dtr = card->sw_caps.hs_max_dtr;
888 } else if (max_dtr > card->csd.max_dtr) {
889 max_dtr = card->csd.max_dtr;
890 }
891
892 return max_dtr;
893 }
894
895 void mmc_sd_go_highspeed(struct mmc_card *card)
896 {
897 mmc_card_set_highspeed(card);
898 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
899 }
900
901 /*
902 * Handle the detection and initialisation of a card.
903 *
904 * In the case of a resume, "oldcard" will contain the card
905 * we're trying to reinitialise.
906 */
907 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
908 struct mmc_card *oldcard)
909 {
910 struct mmc_card *card;
911 int err;
912 u32 cid[4];
913 u32 rocr = 0;
914
915 BUG_ON(!host);
916 WARN_ON(!host->claimed);
917
918 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
919 if (err)
920 return err;
921
922 if (oldcard) {
923 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
924 return -ENOENT;
925
926 card = oldcard;
927 } else {
928 /*
929 * Allocate card structure.
930 */
931 card = mmc_alloc_card(host, &sd_type);
932 if (IS_ERR(card))
933 return PTR_ERR(card);
934
935 card->type = MMC_TYPE_SD;
936 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
937 }
938
939 /*
940 * For native busses: get card RCA and quit open drain mode.
941 */
942 if (!mmc_host_is_spi(host)) {
943 err = mmc_send_relative_addr(host, &card->rca);
944 if (err)
945 return err;
946 }
947
948 if (!oldcard) {
949 err = mmc_sd_get_csd(host, card);
950 if (err)
951 return err;
952
953 mmc_decode_cid(card);
954 }
955
956 /*
957 * Select card, as all following commands rely on that.
958 */
959 if (!mmc_host_is_spi(host)) {
960 err = mmc_select_card(card);
961 if (err)
962 return err;
963 }
964
965 err = mmc_sd_setup_card(host, card, oldcard != NULL);
966 if (err)
967 goto free_card;
968
969 /* Initialization sequence for UHS-I cards */
970 if (rocr & SD_ROCR_S18A) {
971 err = mmc_sd_init_uhs_card(card);
972 if (err)
973 goto free_card;
974
975 /* Card is an ultra-high-speed card */
976 mmc_card_set_uhs(card);
977 } else {
978 /*
979 * Attempt to change to high-speed (if supported)
980 */
981 err = mmc_sd_switch_hs(card);
982 if (err > 0)
983 mmc_sd_go_highspeed(card);
984 else if (err)
985 goto free_card;
986
987 /*
988 * Set bus speed.
989 */
990 mmc_set_clock(host, mmc_sd_get_max_clock(card));
991
992 /*
993 * Switch to wider bus (if supported).
994 */
995 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
996 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
997 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
998 if (err)
999 goto free_card;
1000
1001 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1002 }
1003 }
1004
1005 host->card = card;
1006 return 0;
1007
1008 free_card:
1009 if (!oldcard)
1010 mmc_remove_card(card);
1011
1012 return err;
1013 }
1014
1015 /*
1016 * Host is being removed. Free up the current card.
1017 */
1018 static void mmc_sd_remove(struct mmc_host *host)
1019 {
1020 BUG_ON(!host);
1021 BUG_ON(!host->card);
1022
1023 mmc_remove_card(host->card);
1024 host->card = NULL;
1025 }
1026
1027 /*
1028 * Card detection - card is alive.
1029 */
1030 static int mmc_sd_alive(struct mmc_host *host)
1031 {
1032 return mmc_send_status(host->card, NULL);
1033 }
1034
1035 /*
1036 * Card detection callback from host.
1037 */
1038 static void mmc_sd_detect(struct mmc_host *host)
1039 {
1040 int err;
1041
1042 BUG_ON(!host);
1043 BUG_ON(!host->card);
1044
1045 mmc_get_card(host->card);
1046
1047 /*
1048 * Just check if our card has been removed.
1049 */
1050 err = _mmc_detect_card_removed(host);
1051
1052 mmc_put_card(host->card);
1053
1054 if (err) {
1055 mmc_sd_remove(host);
1056
1057 mmc_claim_host(host);
1058 mmc_detach_bus(host);
1059 mmc_power_off(host);
1060 mmc_release_host(host);
1061 }
1062 }
1063
1064 /*
1065 * Suspend callback from host.
1066 */
1067 static int mmc_sd_suspend(struct mmc_host *host)
1068 {
1069 int err = 0;
1070
1071 BUG_ON(!host);
1072 BUG_ON(!host->card);
1073
1074 mmc_claim_host(host);
1075 if (!mmc_host_is_spi(host))
1076 err = mmc_deselect_cards(host);
1077 host->card->state &= ~MMC_STATE_HIGHSPEED;
1078 if (!err)
1079 mmc_power_off(host);
1080 mmc_release_host(host);
1081
1082 return err;
1083 }
1084
1085 /*
1086 * Resume callback from host.
1087 *
1088 * This function tries to determine if the same card is still present
1089 * and, if so, restore all state to it.
1090 */
1091 static int mmc_sd_resume(struct mmc_host *host)
1092 {
1093 int err;
1094
1095 BUG_ON(!host);
1096 BUG_ON(!host->card);
1097
1098 mmc_claim_host(host);
1099 mmc_power_up(host);
1100 mmc_select_voltage(host, host->ocr);
1101 err = mmc_sd_init_card(host, host->ocr, host->card);
1102 mmc_release_host(host);
1103
1104 return err;
1105 }
1106
1107 /*
1108 * Callback for runtime_suspend.
1109 */
1110 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1111 {
1112 int err;
1113
1114 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1115 return 0;
1116
1117 mmc_claim_host(host);
1118
1119 err = mmc_sd_suspend(host);
1120 if (err) {
1121 pr_err("%s: error %d doing aggessive suspend\n",
1122 mmc_hostname(host), err);
1123 goto out;
1124 }
1125 mmc_power_off(host);
1126
1127 out:
1128 mmc_release_host(host);
1129 return err;
1130 }
1131
1132 /*
1133 * Callback for runtime_resume.
1134 */
1135 static int mmc_sd_runtime_resume(struct mmc_host *host)
1136 {
1137 int err;
1138
1139 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1140 return 0;
1141
1142 mmc_claim_host(host);
1143
1144 mmc_power_up(host);
1145 err = mmc_sd_resume(host);
1146 if (err)
1147 pr_err("%s: error %d doing aggessive resume\n",
1148 mmc_hostname(host), err);
1149
1150 mmc_release_host(host);
1151 return 0;
1152 }
1153
1154 static int mmc_sd_power_restore(struct mmc_host *host)
1155 {
1156 int ret;
1157
1158 host->card->state &= ~MMC_STATE_HIGHSPEED;
1159 mmc_claim_host(host);
1160 ret = mmc_sd_init_card(host, host->ocr, host->card);
1161 mmc_release_host(host);
1162
1163 return ret;
1164 }
1165
1166 static const struct mmc_bus_ops mmc_sd_ops = {
1167 .remove = mmc_sd_remove,
1168 .detect = mmc_sd_detect,
1169 .suspend = NULL,
1170 .resume = NULL,
1171 .power_restore = mmc_sd_power_restore,
1172 .alive = mmc_sd_alive,
1173 .shutdown = mmc_sd_suspend,
1174 };
1175
1176 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1177 .remove = mmc_sd_remove,
1178 .detect = mmc_sd_detect,
1179 .runtime_suspend = mmc_sd_runtime_suspend,
1180 .runtime_resume = mmc_sd_runtime_resume,
1181 .suspend = mmc_sd_suspend,
1182 .resume = mmc_sd_resume,
1183 .power_restore = mmc_sd_power_restore,
1184 .alive = mmc_sd_alive,
1185 .shutdown = mmc_sd_suspend,
1186 };
1187
1188 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1189 {
1190 const struct mmc_bus_ops *bus_ops;
1191
1192 if (!mmc_card_is_removable(host))
1193 bus_ops = &mmc_sd_ops_unsafe;
1194 else
1195 bus_ops = &mmc_sd_ops;
1196 mmc_attach_bus(host, bus_ops);
1197 }
1198
1199 /*
1200 * Starting point for SD card init.
1201 */
1202 int mmc_attach_sd(struct mmc_host *host)
1203 {
1204 int err;
1205 u32 ocr;
1206
1207 BUG_ON(!host);
1208 WARN_ON(!host->claimed);
1209
1210 err = mmc_send_app_op_cond(host, 0, &ocr);
1211 if (err)
1212 return err;
1213
1214 mmc_sd_attach_bus_ops(host);
1215 if (host->ocr_avail_sd)
1216 host->ocr_avail = host->ocr_avail_sd;
1217
1218 /*
1219 * We need to get OCR a different way for SPI.
1220 */
1221 if (mmc_host_is_spi(host)) {
1222 mmc_go_idle(host);
1223
1224 err = mmc_spi_read_ocr(host, 0, &ocr);
1225 if (err)
1226 goto err;
1227 }
1228
1229 /*
1230 * Sanity check the voltages that the card claims to
1231 * support.
1232 */
1233 if (ocr & 0x7F) {
1234 pr_warning("%s: card claims to support voltages "
1235 "below the defined range. These will be ignored.\n",
1236 mmc_hostname(host));
1237 ocr &= ~0x7F;
1238 }
1239
1240 if ((ocr & MMC_VDD_165_195) &&
1241 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1242 pr_warning("%s: SD card claims to support the "
1243 "incompletely defined 'low voltage range'. This "
1244 "will be ignored.\n", mmc_hostname(host));
1245 ocr &= ~MMC_VDD_165_195;
1246 }
1247
1248 host->ocr = mmc_select_voltage(host, ocr);
1249
1250 /*
1251 * Can we support the voltage(s) of the card(s)?
1252 */
1253 if (!host->ocr) {
1254 err = -EINVAL;
1255 goto err;
1256 }
1257
1258 /*
1259 * Detect and init the card.
1260 */
1261 err = mmc_sd_init_card(host, host->ocr, NULL);
1262 if (err)
1263 goto err;
1264
1265 mmc_release_host(host);
1266 err = mmc_add_card(host->card);
1267 mmc_claim_host(host);
1268 if (err)
1269 goto remove_card;
1270
1271 return 0;
1272
1273 remove_card:
1274 mmc_release_host(host);
1275 mmc_remove_card(host->card);
1276 host->card = NULL;
1277 mmc_claim_host(host);
1278 err:
1279 mmc_detach_bus(host);
1280
1281 pr_err("%s: error %d whilst initialising SD card\n",
1282 mmc_hostname(host), err);
1283
1284 return err;
1285 }
1286
CRIS linux kernel tree