?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mmc: sdhci-s3c: Fix mmc card I/O problem
[linux/fpc-iii.git] / drivers / mmc / core / sd.c
blob0370e03e314253f027a36aa994591ea2817f0826
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
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
19 #include <linux/mmc/sd.h>
20
21 #include "core.h"
22 #include "bus.h"
23 #include "mmc_ops.h"
24 #include "sd.h"
25 #include "sd_ops.h"
26
27 static const unsigned int tran_exp[] = {
28 10000, 100000, 1000000, 10000000,
29 0, 0, 0, 0
30 };
31
32 static const unsigned char tran_mant[] = {
33 0, 10, 12, 13, 15, 20, 25, 30,
34 35, 40, 45, 50, 55, 60, 70, 80,
35 };
36
37 static const unsigned int tacc_exp[] = {
38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
39 };
40
41 static const unsigned int tacc_mant[] = {
42 0, 10, 12, 13, 15, 20, 25, 30,
43 35, 40, 45, 50, 55, 60, 70, 80,
44 };
45
46 #define UNSTUFF_BITS(resp,start,size) \
47 ({ \
48 const int __size = size; \
49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
50 const int __off = 3 - ((start) / 32); \
51 const int __shft = (start) & 31; \
52 u32 __res; \
53 \
54 __res = resp[__off] >> __shft; \
55 if (__size + __shft > 32) \
56 __res |= resp[__off-1] << ((32 - __shft) % 32); \
57 __res & __mask; \
58 })
59
60 /*
61 * Given the decoded CSD structure, decode the raw CID to our CID structure.
62 */
63 void mmc_decode_cid(struct mmc_card *card)
64 {
65 u32 *resp = card->raw_cid;
66
67 memset(&card->cid, 0, sizeof(struct mmc_cid));
68
69 /*
70 * SD doesn't currently have a version field so we will
71 * have to assume we can parse this.
72 */
73 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
74 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
75 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
76 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
77 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
78 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
79 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
80 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
81 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
82 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
83 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
84 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
85
86 card->cid.year += 2000; /* SD cards year offset */
87 }
88
89 /*
90 * Given a 128-bit response, decode to our card CSD structure.
91 */
92 static int mmc_decode_csd(struct mmc_card *card)
93 {
94 struct mmc_csd *csd = &card->csd;
95 unsigned int e, m, csd_struct;
96 u32 *resp = card->raw_csd;
97
98 csd_struct = UNSTUFF_BITS(resp, 126, 2);
99
100 switch (csd_struct) {
101 case 0:
102 m = UNSTUFF_BITS(resp, 115, 4);
103 e = UNSTUFF_BITS(resp, 112, 3);
104 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
105 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
106
107 m = UNSTUFF_BITS(resp, 99, 4);
108 e = UNSTUFF_BITS(resp, 96, 3);
109 csd->max_dtr = tran_exp[e] * tran_mant[m];
110 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
111
112 e = UNSTUFF_BITS(resp, 47, 3);
113 m = UNSTUFF_BITS(resp, 62, 12);
114 csd->capacity = (1 + m) << (e + 2);
115
116 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
117 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
118 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
119 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
120 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
121 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
122 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
123
124 if (UNSTUFF_BITS(resp, 46, 1)) {
125 csd->erase_size = 1;
126 } else if (csd->write_blkbits >= 9) {
127 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
128 csd->erase_size <<= csd->write_blkbits - 9;
129 }
130 break;
131 case 1:
132 /*
133 * This is a block-addressed SDHC or SDXC card. Most
134 * interesting fields are unused and have fixed
135 * values. To avoid getting tripped by buggy cards,
136 * we assume those fixed values ourselves.
137 */
138 mmc_card_set_blockaddr(card);
139
140 csd->tacc_ns = 0; /* Unused */
141 csd->tacc_clks = 0; /* Unused */
142
143 m = UNSTUFF_BITS(resp, 99, 4);
144 e = UNSTUFF_BITS(resp, 96, 3);
145 csd->max_dtr = tran_exp[e] * tran_mant[m];
146 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
147 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
148
149 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
150 if (csd->c_size >= 0xFFFF)
151 mmc_card_set_ext_capacity(card);
152
153 m = UNSTUFF_BITS(resp, 48, 22);
154 csd->capacity = (1 + m) << 10;
155
156 csd->read_blkbits = 9;
157 csd->read_partial = 0;
158 csd->write_misalign = 0;
159 csd->read_misalign = 0;
160 csd->r2w_factor = 4; /* Unused */
161 csd->write_blkbits = 9;
162 csd->write_partial = 0;
163 csd->erase_size = 1;
164 break;
165 default:
166 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
167 mmc_hostname(card->host), csd_struct);
168 return -EINVAL;
169 }
170
171 card->erase_size = csd->erase_size;
172
173 return 0;
174 }
175
176 /*
177 * Given a 64-bit response, decode to our card SCR structure.
178 */
179 static int mmc_decode_scr(struct mmc_card *card)
180 {
181 struct sd_scr *scr = &card->scr;
182 unsigned int scr_struct;
183 u32 resp[4];
184
185 resp[3] = card->raw_scr[1];
186 resp[2] = card->raw_scr[0];
187
188 scr_struct = UNSTUFF_BITS(resp, 60, 4);
189 if (scr_struct != 0) {
190 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
191 mmc_hostname(card->host), scr_struct);
192 return -EINVAL;
193 }
194
195 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
196 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
197 if (scr->sda_vsn == SCR_SPEC_VER_2)
198 /* Check if Physical Layer Spec v3.0 is supported */
199 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
200
201 if (UNSTUFF_BITS(resp, 55, 1))
202 card->erased_byte = 0xFF;
203 else
204 card->erased_byte = 0x0;
205
206 if (scr->sda_spec3)
207 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
208 return 0;
209 }
210
211 /*
212 * Fetch and process SD Status register.
213 */
214 static int mmc_read_ssr(struct mmc_card *card)
215 {
216 unsigned int au, es, et, eo;
217 int err, i;
218 u32 *ssr;
219
220 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
221 printk(KERN_WARNING "%s: card lacks mandatory SD Status "
222 "function.\n", mmc_hostname(card->host));
223 return 0;
224 }
225
226 ssr = kmalloc(64, GFP_KERNEL);
227 if (!ssr)
228 return -ENOMEM;
229
230 err = mmc_app_sd_status(card, ssr);
231 if (err) {
232 printk(KERN_WARNING "%s: problem reading SD Status "
233 "register.\n", mmc_hostname(card->host));
234 err = 0;
235 goto out;
236 }
237
238 for (i = 0; i < 16; i++)
239 ssr[i] = be32_to_cpu(ssr[i]);
240
241 /*
242 * UNSTUFF_BITS only works with four u32s so we have to offset the
243 * bitfield positions accordingly.
244 */
245 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
246 if (au > 0 || au <= 9) {
247 card->ssr.au = 1 << (au + 4);
248 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
249 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
250 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
251 if (es && et) {
252 card->ssr.erase_timeout = (et * 1000) / es;
253 card->ssr.erase_offset = eo * 1000;
254 }
255 } else {
256 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit "
257 "size.\n", mmc_hostname(card->host));
258 }
259 out:
260 kfree(ssr);
261 return err;
262 }
263
264 /*
265 * Fetches and decodes switch information
266 */
267 static int mmc_read_switch(struct mmc_card *card)
268 {
269 int err;
270 u8 *status;
271
272 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
273 return 0;
274
275 if (!(card->csd.cmdclass & CCC_SWITCH)) {
276 printk(KERN_WARNING "%s: card lacks mandatory switch "
277 "function, performance might suffer.\n",
278 mmc_hostname(card->host));
279 return 0;
280 }
281
282 err = -EIO;
283
284 status = kmalloc(64, GFP_KERNEL);
285 if (!status) {
286 printk(KERN_ERR "%s: could not allocate a buffer for "
287 "switch capabilities.\n",
288 mmc_hostname(card->host));
289 return -ENOMEM;
290 }
291
292 /* Find out the supported Bus Speed Modes. */
293 err = mmc_sd_switch(card, 0, 0, 1, status);
294 if (err) {
295 /*
296 * If the host or the card can't do the switch,
297 * fail more gracefully.
298 */
299 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
300 goto out;
301
302 printk(KERN_WARNING "%s: problem reading Bus Speed modes.\n",
303 mmc_hostname(card->host));
304 err = 0;
305
306 goto out;
307 }
308
309 if (card->scr.sda_spec3) {
310 card->sw_caps.sd3_bus_mode = status[13];
311
312 /* Find out Driver Strengths supported by the card */
313 err = mmc_sd_switch(card, 0, 2, 1, status);
314 if (err) {
315 /*
316 * If the host or the card can't do the switch,
317 * fail more gracefully.
318 */
319 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
320 goto out;
321
322 printk(KERN_WARNING "%s: problem reading "
323 "Driver Strength.\n",
324 mmc_hostname(card->host));
325 err = 0;
326
327 goto out;
328 }
329
330 card->sw_caps.sd3_drv_type = status[9];
331
332 /* Find out Current Limits supported by the card */
333 err = mmc_sd_switch(card, 0, 3, 1, status);
334 if (err) {
335 /*
336 * If the host or the card can't do the switch,
337 * fail more gracefully.
338 */
339 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
340 goto out;
341
342 printk(KERN_WARNING "%s: problem reading "
343 "Current Limit.\n",
344 mmc_hostname(card->host));
345 err = 0;
346
347 goto out;
348 }
349
350 card->sw_caps.sd3_curr_limit = status[7];
351 } else {
352 if (status[13] & 0x02)
353 card->sw_caps.hs_max_dtr = 50000000;
354 }
355
356 out:
357 kfree(status);
358
359 return err;
360 }
361
362 /*
363 * Test if the card supports high-speed mode and, if so, switch to it.
364 */
365 int mmc_sd_switch_hs(struct mmc_card *card)
366 {
367 int err;
368 u8 *status;
369
370 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
371 return 0;
372
373 if (!(card->csd.cmdclass & CCC_SWITCH))
374 return 0;
375
376 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
377 return 0;
378
379 if (card->sw_caps.hs_max_dtr == 0)
380 return 0;
381
382 err = -EIO;
383
384 status = kmalloc(64, GFP_KERNEL);
385 if (!status) {
386 printk(KERN_ERR "%s: could not allocate a buffer for "
387 "switch capabilities.\n", mmc_hostname(card->host));
388 return -ENOMEM;
389 }
390
391 err = mmc_sd_switch(card, 1, 0, 1, status);
392 if (err)
393 goto out;
394
395 if ((status[16] & 0xF) != 1) {
396 printk(KERN_WARNING "%s: Problem switching card "
397 "into high-speed mode!\n",
398 mmc_hostname(card->host));
399 err = 0;
400 } else {
401 err = 1;
402 }
403
404 out:
405 kfree(status);
406
407 return err;
408 }
409
410 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
411 {
412 int host_drv_type = SD_DRIVER_TYPE_B;
413 int card_drv_type = SD_DRIVER_TYPE_B;
414 int drive_strength;
415 int err;
416
417 /*
418 * If the host doesn't support any of the Driver Types A,C or D,
419 * or there is no board specific handler then default Driver
420 * Type B is used.
421 */
422 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
423 | MMC_CAP_DRIVER_TYPE_D)))
424 return 0;
425
426 if (!card->host->ops->select_drive_strength)
427 return 0;
428
429 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
430 host_drv_type |= SD_DRIVER_TYPE_A;
431
432 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
433 host_drv_type |= SD_DRIVER_TYPE_C;
434
435 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
436 host_drv_type |= SD_DRIVER_TYPE_D;
437
438 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
439 card_drv_type |= SD_DRIVER_TYPE_A;
440
441 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
442 card_drv_type |= SD_DRIVER_TYPE_C;
443
444 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
445 card_drv_type |= SD_DRIVER_TYPE_D;
446
447 /*
448 * The drive strength that the hardware can support
449 * depends on the board design. Pass the appropriate
450 * information and let the hardware specific code
451 * return what is possible given the options
452 */
453 drive_strength = card->host->ops->select_drive_strength(
454 card->sw_caps.uhs_max_dtr,
455 host_drv_type, card_drv_type);
456
457 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
458 if (err)
459 return err;
460
461 if ((status[15] & 0xF) != drive_strength) {
462 printk(KERN_WARNING "%s: Problem setting drive strength!\n",
463 mmc_hostname(card->host));
464 return 0;
465 }
466
467 mmc_set_driver_type(card->host, drive_strength);
468
469 return 0;
470 }
471
472 static void sd_update_bus_speed_mode(struct mmc_card *card)
473 {
474 /*
475 * If the host doesn't support any of the UHS-I modes, fallback on
476 * default speed.
477 */
478 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
479 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) {
480 card->sd_bus_speed = 0;
481 return;
482 }
483
484 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
485 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
486 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
487 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
488 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
489 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
490 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
491 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
492 SD_MODE_UHS_SDR50)) {
493 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
494 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
495 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
496 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
497 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
498 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
499 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
500 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
501 SD_MODE_UHS_SDR12)) {
502 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
503 }
504 }
505
506 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
507 {
508 int err;
509 unsigned int timing = 0;
510
511 switch (card->sd_bus_speed) {
512 case UHS_SDR104_BUS_SPEED:
513 timing = MMC_TIMING_UHS_SDR104;
514 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
515 break;
516 case UHS_DDR50_BUS_SPEED:
517 timing = MMC_TIMING_UHS_DDR50;
518 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
519 break;
520 case UHS_SDR50_BUS_SPEED:
521 timing = MMC_TIMING_UHS_SDR50;
522 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
523 break;
524 case UHS_SDR25_BUS_SPEED:
525 timing = MMC_TIMING_UHS_SDR25;
526 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
527 break;
528 case UHS_SDR12_BUS_SPEED:
529 timing = MMC_TIMING_UHS_SDR12;
530 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
531 break;
532 default:
533 return 0;
534 }
535
536 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
537 if (err)
538 return err;
539
540 if ((status[16] & 0xF) != card->sd_bus_speed)
541 printk(KERN_WARNING "%s: Problem setting bus speed mode!\n",
542 mmc_hostname(card->host));
543 else {
544 mmc_set_timing(card->host, timing);
545 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
546 }
547
548 return 0;
549 }
550
551 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
552 {
553 int current_limit = 0;
554 int err;
555
556 /*
557 * Current limit switch is only defined for SDR50, SDR104, and DDR50
558 * bus speed modes. For other bus speed modes, we set the default
559 * current limit of 200mA.
560 */
561 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
562 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
563 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) {
564 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
565 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
566 current_limit = SD_SET_CURRENT_LIMIT_800;
567 else if (card->sw_caps.sd3_curr_limit &
568 SD_MAX_CURRENT_600)
569 current_limit = SD_SET_CURRENT_LIMIT_600;
570 else if (card->sw_caps.sd3_curr_limit &
571 SD_MAX_CURRENT_400)
572 current_limit = SD_SET_CURRENT_LIMIT_400;
573 else if (card->sw_caps.sd3_curr_limit &
574 SD_MAX_CURRENT_200)
575 current_limit = SD_SET_CURRENT_LIMIT_200;
576 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
577 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
578 current_limit = SD_SET_CURRENT_LIMIT_600;
579 else if (card->sw_caps.sd3_curr_limit &
580 SD_MAX_CURRENT_400)
581 current_limit = SD_SET_CURRENT_LIMIT_400;
582 else if (card->sw_caps.sd3_curr_limit &
583 SD_MAX_CURRENT_200)
584 current_limit = SD_SET_CURRENT_LIMIT_200;
585 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
586 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
587 current_limit = SD_SET_CURRENT_LIMIT_400;
588 else if (card->sw_caps.sd3_curr_limit &
589 SD_MAX_CURRENT_200)
590 current_limit = SD_SET_CURRENT_LIMIT_200;
591 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
592 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
593 current_limit = SD_SET_CURRENT_LIMIT_200;
594 }
595 } else
596 current_limit = SD_SET_CURRENT_LIMIT_200;
597
598 err = mmc_sd_switch(card, 1, 3, current_limit, status);
599 if (err)
600 return err;
601
602 if (((status[15] >> 4) & 0x0F) != current_limit)
603 printk(KERN_WARNING "%s: Problem setting current limit!\n",
604 mmc_hostname(card->host));
605
606 return 0;
607 }
608
609 /*
610 * UHS-I specific initialization procedure
611 */
612 static int mmc_sd_init_uhs_card(struct mmc_card *card)
613 {
614 int err;
615 u8 *status;
616
617 if (!card->scr.sda_spec3)
618 return 0;
619
620 if (!(card->csd.cmdclass & CCC_SWITCH))
621 return 0;
622
623 status = kmalloc(64, GFP_KERNEL);
624 if (!status) {
625 printk(KERN_ERR "%s: could not allocate a buffer for "
626 "switch capabilities.\n", mmc_hostname(card->host));
627 return -ENOMEM;
628 }
629
630 /* Set 4-bit bus width */
631 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
632 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
633 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
634 if (err)
635 goto out;
636
637 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
638 }
639
640 /*
641 * Select the bus speed mode depending on host
642 * and card capability.
643 */
644 sd_update_bus_speed_mode(card);
645
646 /* Set the driver strength for the card */
647 err = sd_select_driver_type(card, status);
648 if (err)
649 goto out;
650
651 /* Set current limit for the card */
652 err = sd_set_current_limit(card, status);
653 if (err)
654 goto out;
655
656 /* Set bus speed mode of the card */
657 err = sd_set_bus_speed_mode(card, status);
658 if (err)
659 goto out;
660
661 /* SPI mode doesn't define CMD19 */
662 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
663 err = card->host->ops->execute_tuning(card->host);
664
665 out:
666 kfree(status);
667
668 return err;
669 }
670
671 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
672 card->raw_cid[2], card->raw_cid[3]);
673 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
674 card->raw_csd[2], card->raw_csd[3]);
675 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
676 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
677 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
678 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
679 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
680 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
681 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
682 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
683 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
684 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
685
686
687 static struct attribute *sd_std_attrs[] = {
688 &dev_attr_cid.attr,
689 &dev_attr_csd.attr,
690 &dev_attr_scr.attr,
691 &dev_attr_date.attr,
692 &dev_attr_erase_size.attr,
693 &dev_attr_preferred_erase_size.attr,
694 &dev_attr_fwrev.attr,
695 &dev_attr_hwrev.attr,
696 &dev_attr_manfid.attr,
697 &dev_attr_name.attr,
698 &dev_attr_oemid.attr,
699 &dev_attr_serial.attr,
700 NULL,
701 };
702
703 static struct attribute_group sd_std_attr_group = {
704 .attrs = sd_std_attrs,
705 };
706
707 static const struct attribute_group *sd_attr_groups[] = {
708 &sd_std_attr_group,
709 NULL,
710 };
711
712 struct device_type sd_type = {
713 .groups = sd_attr_groups,
714 };
715
716 /*
717 * Fetch CID from card.
718 */
719 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
720 {
721 int err;
722
723 /*
724 * Since we're changing the OCR value, we seem to
725 * need to tell some cards to go back to the idle
726 * state. We wait 1ms to give cards time to
727 * respond.
728 */
729 mmc_go_idle(host);
730
731 /*
732 * If SD_SEND_IF_COND indicates an SD 2.0
733 * compliant card and we should set bit 30
734 * of the ocr to indicate that we can handle
735 * block-addressed SDHC cards.
736 */
737 err = mmc_send_if_cond(host, ocr);
738 if (!err)
739 ocr |= SD_OCR_CCS;
740
741 /*
742 * If the host supports one of UHS-I modes, request the card
743 * to switch to 1.8V signaling level.
744 */
745 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
746 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
747 ocr |= SD_OCR_S18R;
748
749 /* If the host can supply more than 150mA, XPC should be set to 1. */
750 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 |
751 MMC_CAP_SET_XPC_180))
752 ocr |= SD_OCR_XPC;
753
754 try_again:
755 err = mmc_send_app_op_cond(host, ocr, rocr);
756 if (err)
757 return err;
758
759 /*
760 * In case CCS and S18A in the response is set, start Signal Voltage
761 * Switch procedure. SPI mode doesn't support CMD11.
762 */
763 if (!mmc_host_is_spi(host) && rocr &&
764 ((*rocr & 0x41000000) == 0x41000000)) {
765 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
766 if (err) {
767 ocr &= ~SD_OCR_S18R;
768 goto try_again;
769 }
770 }
771
772 if (mmc_host_is_spi(host))
773 err = mmc_send_cid(host, cid);
774 else
775 err = mmc_all_send_cid(host, cid);
776
777 return err;
778 }
779
780 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
781 {
782 int err;
783
784 /*
785 * Fetch CSD from card.
786 */
787 err = mmc_send_csd(card, card->raw_csd);
788 if (err)
789 return err;
790
791 err = mmc_decode_csd(card);
792 if (err)
793 return err;
794
795 return 0;
796 }
797
798 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
799 bool reinit)
800 {
801 int err;
802
803 if (!reinit) {
804 /*
805 * Fetch SCR from card.
806 */
807 err = mmc_app_send_scr(card, card->raw_scr);
808 if (err)
809 return err;
810
811 err = mmc_decode_scr(card);
812 if (err)
813 return err;
814
815 /*
816 * Fetch and process SD Status register.
817 */
818 err = mmc_read_ssr(card);
819 if (err)
820 return err;
821
822 /* Erase init depends on CSD and SSR */
823 mmc_init_erase(card);
824
825 /*
826 * Fetch switch information from card.
827 */
828 err = mmc_read_switch(card);
829 if (err)
830 return err;
831 }
832
833 /*
834 * For SPI, enable CRC as appropriate.
835 * This CRC enable is located AFTER the reading of the
836 * card registers because some SDHC cards are not able
837 * to provide valid CRCs for non-512-byte blocks.
838 */
839 if (mmc_host_is_spi(host)) {
840 err = mmc_spi_set_crc(host, use_spi_crc);
841 if (err)
842 return err;
843 }
844
845 /*
846 * Check if read-only switch is active.
847 */
848 if (!reinit) {
849 int ro = -1;
850
851 if (host->ops->get_ro)
852 ro = host->ops->get_ro(host);
853
854 if (ro < 0) {
855 printk(KERN_WARNING "%s: host does not "
856 "support reading read-only "
857 "switch. assuming write-enable.\n",
858 mmc_hostname(host));
859 } else if (ro > 0) {
860 mmc_card_set_readonly(card);
861 }
862 }
863
864 return 0;
865 }
866
867 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
868 {
869 unsigned max_dtr = (unsigned int)-1;
870
871 if (mmc_card_highspeed(card)) {
872 if (max_dtr > card->sw_caps.hs_max_dtr)
873 max_dtr = card->sw_caps.hs_max_dtr;
874 } else if (max_dtr > card->csd.max_dtr) {
875 max_dtr = card->csd.max_dtr;
876 }
877
878 return max_dtr;
879 }
880
881 void mmc_sd_go_highspeed(struct mmc_card *card)
882 {
883 mmc_card_set_highspeed(card);
884 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
885 }
886
887 /*
888 * Handle the detection and initialisation of a card.
889 *
890 * In the case of a resume, "oldcard" will contain the card
891 * we're trying to reinitialise.
892 */
893 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
894 struct mmc_card *oldcard)
895 {
896 struct mmc_card *card;
897 int err;
898 u32 cid[4];
899 u32 rocr = 0;
900
901 BUG_ON(!host);
902 WARN_ON(!host->claimed);
903
904 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
905 if (err)
906 return err;
907
908 if (oldcard) {
909 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
910 return -ENOENT;
911
912 card = oldcard;
913 } else {
914 /*
915 * Allocate card structure.
916 */
917 card = mmc_alloc_card(host, &sd_type);
918 if (IS_ERR(card))
919 return PTR_ERR(card);
920
921 card->type = MMC_TYPE_SD;
922 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
923 }
924
925 /*
926 * For native busses: get card RCA and quit open drain mode.
927 */
928 if (!mmc_host_is_spi(host)) {
929 err = mmc_send_relative_addr(host, &card->rca);
930 if (err)
931 return err;
932
933 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
934 }
935
936 if (!oldcard) {
937 err = mmc_sd_get_csd(host, card);
938 if (err)
939 return err;
940
941 mmc_decode_cid(card);
942 }
943
944 /*
945 * Select card, as all following commands rely on that.
946 */
947 if (!mmc_host_is_spi(host)) {
948 err = mmc_select_card(card);
949 if (err)
950 return err;
951 }
952
953 err = mmc_sd_setup_card(host, card, oldcard != NULL);
954 if (err)
955 goto free_card;
956
957 /* Initialization sequence for UHS-I cards */
958 if (rocr & SD_ROCR_S18A) {
959 err = mmc_sd_init_uhs_card(card);
960 if (err)
961 goto free_card;
962
963 /* Card is an ultra-high-speed card */
964 mmc_sd_card_set_uhs(card);
965
966 /*
967 * Since initialization is now complete, enable preset
968 * value registers for UHS-I cards.
969 */
970 if (host->ops->enable_preset_value)
971 host->ops->enable_preset_value(host, true);
972 } else {
973 /*
974 * Attempt to change to high-speed (if supported)
975 */
976 err = mmc_sd_switch_hs(card);
977 if (err > 0)
978 mmc_sd_go_highspeed(card);
979 else if (err)
980 goto free_card;
981
982 /*
983 * Set bus speed.
984 */
985 mmc_set_clock(host, mmc_sd_get_max_clock(card));
986
987 /*
988 * Switch to wider bus (if supported).
989 */
990 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
991 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
992 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
993 if (err)
994 goto free_card;
995
996 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
997 }
998 }
999
1000 host->card = card;
1001 return 0;
1002
1003 free_card:
1004 if (!oldcard)
1005 mmc_remove_card(card);
1006
1007 return err;
1008 }
1009
1010 /*
1011 * Host is being removed. Free up the current card.
1012 */
1013 static void mmc_sd_remove(struct mmc_host *host)
1014 {
1015 BUG_ON(!host);
1016 BUG_ON(!host->card);
1017
1018 mmc_remove_card(host->card);
1019 host->card = NULL;
1020 }
1021
1022 /*
1023 * Card detection callback from host.
1024 */
1025 static void mmc_sd_detect(struct mmc_host *host)
1026 {
1027 int err;
1028
1029 BUG_ON(!host);
1030 BUG_ON(!host->card);
1031
1032 mmc_claim_host(host);
1033
1034 /*
1035 * Just check if our card has been removed.
1036 */
1037 err = mmc_send_status(host->card, NULL);
1038
1039 mmc_release_host(host);
1040
1041 if (err) {
1042 mmc_sd_remove(host);
1043
1044 mmc_claim_host(host);
1045 mmc_detach_bus(host);
1046 mmc_release_host(host);
1047 }
1048 }
1049
1050 /*
1051 * Suspend callback from host.
1052 */
1053 static int mmc_sd_suspend(struct mmc_host *host)
1054 {
1055 BUG_ON(!host);
1056 BUG_ON(!host->card);
1057
1058 mmc_claim_host(host);
1059 if (!mmc_host_is_spi(host))
1060 mmc_deselect_cards(host);
1061 host->card->state &= ~MMC_STATE_HIGHSPEED;
1062 mmc_release_host(host);
1063
1064 return 0;
1065 }
1066
1067 /*
1068 * Resume callback from host.
1069 *
1070 * This function tries to determine if the same card is still present
1071 * and, if so, restore all state to it.
1072 */
1073 static int mmc_sd_resume(struct mmc_host *host)
1074 {
1075 int err;
1076
1077 BUG_ON(!host);
1078 BUG_ON(!host->card);
1079
1080 mmc_claim_host(host);
1081 err = mmc_sd_init_card(host, host->ocr, host->card);
1082 mmc_release_host(host);
1083
1084 return err;
1085 }
1086
1087 static int mmc_sd_power_restore(struct mmc_host *host)
1088 {
1089 int ret;
1090
1091 host->card->state &= ~MMC_STATE_HIGHSPEED;
1092 mmc_claim_host(host);
1093 ret = mmc_sd_init_card(host, host->ocr, host->card);
1094 mmc_release_host(host);
1095
1096 return ret;
1097 }
1098
1099 static const struct mmc_bus_ops mmc_sd_ops = {
1100 .remove = mmc_sd_remove,
1101 .detect = mmc_sd_detect,
1102 .suspend = NULL,
1103 .resume = NULL,
1104 .power_restore = mmc_sd_power_restore,
1105 };
1106
1107 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1108 .remove = mmc_sd_remove,
1109 .detect = mmc_sd_detect,
1110 .suspend = mmc_sd_suspend,
1111 .resume = mmc_sd_resume,
1112 .power_restore = mmc_sd_power_restore,
1113 };
1114
1115 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1116 {
1117 const struct mmc_bus_ops *bus_ops;
1118
1119 if (!mmc_card_is_removable(host))
1120 bus_ops = &mmc_sd_ops_unsafe;
1121 else
1122 bus_ops = &mmc_sd_ops;
1123 mmc_attach_bus(host, bus_ops);
1124 }
1125
1126 /*
1127 * Starting point for SD card init.
1128 */
1129 int mmc_attach_sd(struct mmc_host *host)
1130 {
1131 int err;
1132 u32 ocr;
1133
1134 BUG_ON(!host);
1135 WARN_ON(!host->claimed);
1136
1137 /* Make sure we are at 3.3V signalling voltage */
1138 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
1139 if (err)
1140 return err;
1141
1142 /* Disable preset value enable if already set since last time */
1143 if (host->ops->enable_preset_value)
1144 host->ops->enable_preset_value(host, false);
1145
1146 err = mmc_send_app_op_cond(host, 0, &ocr);
1147 if (err)
1148 return err;
1149
1150 mmc_sd_attach_bus_ops(host);
1151 if (host->ocr_avail_sd)
1152 host->ocr_avail = host->ocr_avail_sd;
1153
1154 /*
1155 * We need to get OCR a different way for SPI.
1156 */
1157 if (mmc_host_is_spi(host)) {
1158 mmc_go_idle(host);
1159
1160 err = mmc_spi_read_ocr(host, 0, &ocr);
1161 if (err)
1162 goto err;
1163 }
1164
1165 /*
1166 * Sanity check the voltages that the card claims to
1167 * support.
1168 */
1169 if (ocr & 0x7F) {
1170 printk(KERN_WARNING "%s: card claims to support voltages "
1171 "below the defined range. These will be ignored.\n",
1172 mmc_hostname(host));
1173 ocr &= ~0x7F;
1174 }
1175
1176 if ((ocr & MMC_VDD_165_195) &&
1177 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1178 printk(KERN_WARNING "%s: SD card claims to support the "
1179 "incompletely defined 'low voltage range'. This "
1180 "will be ignored.\n", mmc_hostname(host));
1181 ocr &= ~MMC_VDD_165_195;
1182 }
1183
1184 host->ocr = mmc_select_voltage(host, ocr);
1185
1186 /*
1187 * Can we support the voltage(s) of the card(s)?
1188 */
1189 if (!host->ocr) {
1190 err = -EINVAL;
1191 goto err;
1192 }
1193
1194 /*
1195 * Detect and init the card.
1196 */
1197 err = mmc_sd_init_card(host, host->ocr, NULL);
1198 if (err)
1199 goto err;
1200
1201 mmc_release_host(host);
1202 err = mmc_add_card(host->card);
1203 mmc_claim_host(host);
1204 if (err)
1205 goto remove_card;
1206
1207 return 0;
1208
1209 remove_card:
1210 mmc_release_host(host);
1211 mmc_remove_card(host->card);
1212 host->card = NULL;
1213 mmc_claim_host(host);
1214 err:
1215 mmc_detach_bus(host);
1216
1217 printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
1218 mmc_hostname(host), err);
1219
1220 return err;
1221 }
1222
Linux with added FPC-III support