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Merge remote-tracking branch 'moduleh/module.h-split'
[linux-2.6/next.git] / drivers / mmc / core / sd.c
blobaba599c8ca787ff62cb6932eb22a810982b996fa
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 printk(KERN_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 printk(KERN_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 printk(KERN_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 printk(KERN_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 printk(KERN_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 printk(KERN_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 printk(KERN_ERR "%s: could not allocate a buffer for "
288 "switch capabilities.\n",
289 mmc_hostname(card->host));
290 return -ENOMEM;
291 }
292
293 /* Find out the supported Bus Speed Modes. */
294 err = mmc_sd_switch(card, 0, 0, 1, status);
295 if (err) {
296 /*
297 * If the host or the card can't do the switch,
298 * fail more gracefully.
299 */
300 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
301 goto out;
302
303 printk(KERN_WARNING "%s: problem reading Bus Speed modes.\n",
304 mmc_hostname(card->host));
305 err = 0;
306
307 goto out;
308 }
309
310 if (card->scr.sda_spec3) {
311 card->sw_caps.sd3_bus_mode = status[13];
312
313 /* Find out Driver Strengths supported by the card */
314 err = mmc_sd_switch(card, 0, 2, 1, status);
315 if (err) {
316 /*
317 * If the host or the card can't do the switch,
318 * fail more gracefully.
319 */
320 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
321 goto out;
322
323 printk(KERN_WARNING "%s: problem reading "
324 "Driver Strength.\n",
325 mmc_hostname(card->host));
326 err = 0;
327
328 goto out;
329 }
330
331 card->sw_caps.sd3_drv_type = status[9];
332
333 /* Find out Current Limits supported by the card */
334 err = mmc_sd_switch(card, 0, 3, 1, status);
335 if (err) {
336 /*
337 * If the host or the card can't do the switch,
338 * fail more gracefully.
339 */
340 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
341 goto out;
342
343 printk(KERN_WARNING "%s: problem reading "
344 "Current Limit.\n",
345 mmc_hostname(card->host));
346 err = 0;
347
348 goto out;
349 }
350
351 card->sw_caps.sd3_curr_limit = status[7];
352 } else {
353 if (status[13] & 0x02)
354 card->sw_caps.hs_max_dtr = 50000000;
355 }
356
357 out:
358 kfree(status);
359
360 return err;
361 }
362
363 /*
364 * Test if the card supports high-speed mode and, if so, switch to it.
365 */
366 int mmc_sd_switch_hs(struct mmc_card *card)
367 {
368 int err;
369 u8 *status;
370
371 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
372 return 0;
373
374 if (!(card->csd.cmdclass & CCC_SWITCH))
375 return 0;
376
377 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
378 return 0;
379
380 if (card->sw_caps.hs_max_dtr == 0)
381 return 0;
382
383 err = -EIO;
384
385 status = kmalloc(64, GFP_KERNEL);
386 if (!status) {
387 printk(KERN_ERR "%s: could not allocate a buffer for "
388 "switch capabilities.\n", mmc_hostname(card->host));
389 return -ENOMEM;
390 }
391
392 err = mmc_sd_switch(card, 1, 0, 1, status);
393 if (err)
394 goto out;
395
396 if ((status[16] & 0xF) != 1) {
397 printk(KERN_WARNING "%s: Problem switching card "
398 "into high-speed mode!\n",
399 mmc_hostname(card->host));
400 err = 0;
401 } else {
402 err = 1;
403 }
404
405 out:
406 kfree(status);
407
408 return err;
409 }
410
411 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
412 {
413 int host_drv_type = SD_DRIVER_TYPE_B;
414 int card_drv_type = SD_DRIVER_TYPE_B;
415 int drive_strength;
416 int err;
417
418 /*
419 * If the host doesn't support any of the Driver Types A,C or D,
420 * or there is no board specific handler then default Driver
421 * Type B is used.
422 */
423 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
424 | MMC_CAP_DRIVER_TYPE_D)))
425 return 0;
426
427 if (!card->host->ops->select_drive_strength)
428 return 0;
429
430 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
431 host_drv_type |= SD_DRIVER_TYPE_A;
432
433 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
434 host_drv_type |= SD_DRIVER_TYPE_C;
435
436 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
437 host_drv_type |= SD_DRIVER_TYPE_D;
438
439 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
440 card_drv_type |= SD_DRIVER_TYPE_A;
441
442 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
443 card_drv_type |= SD_DRIVER_TYPE_C;
444
445 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
446 card_drv_type |= SD_DRIVER_TYPE_D;
447
448 /*
449 * The drive strength that the hardware can support
450 * depends on the board design. Pass the appropriate
451 * information and let the hardware specific code
452 * return what is possible given the options
453 */
454 drive_strength = card->host->ops->select_drive_strength(
455 card->sw_caps.uhs_max_dtr,
456 host_drv_type, card_drv_type);
457
458 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
459 if (err)
460 return err;
461
462 if ((status[15] & 0xF) != drive_strength) {
463 printk(KERN_WARNING "%s: Problem setting drive strength!\n",
464 mmc_hostname(card->host));
465 return 0;
466 }
467
468 mmc_set_driver_type(card->host, drive_strength);
469
470 return 0;
471 }
472
473 static void sd_update_bus_speed_mode(struct mmc_card *card)
474 {
475 /*
476 * If the host doesn't support any of the UHS-I modes, fallback on
477 * default speed.
478 */
479 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
480 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) {
481 card->sd_bus_speed = 0;
482 return;
483 }
484
485 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
486 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
487 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
488 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
489 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
490 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
491 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
492 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
493 SD_MODE_UHS_SDR50)) {
494 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
495 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
496 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
497 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
498 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
499 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
500 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
501 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
502 SD_MODE_UHS_SDR12)) {
503 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
504 }
505 }
506
507 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
508 {
509 int err;
510 unsigned int timing = 0;
511
512 switch (card->sd_bus_speed) {
513 case UHS_SDR104_BUS_SPEED:
514 timing = MMC_TIMING_UHS_SDR104;
515 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
516 break;
517 case UHS_DDR50_BUS_SPEED:
518 timing = MMC_TIMING_UHS_DDR50;
519 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
520 break;
521 case UHS_SDR50_BUS_SPEED:
522 timing = MMC_TIMING_UHS_SDR50;
523 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
524 break;
525 case UHS_SDR25_BUS_SPEED:
526 timing = MMC_TIMING_UHS_SDR25;
527 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
528 break;
529 case UHS_SDR12_BUS_SPEED:
530 timing = MMC_TIMING_UHS_SDR12;
531 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
532 break;
533 default:
534 return 0;
535 }
536
537 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
538 if (err)
539 return err;
540
541 if ((status[16] & 0xF) != card->sd_bus_speed)
542 printk(KERN_WARNING "%s: Problem setting bus speed mode!\n",
543 mmc_hostname(card->host));
544 else {
545 mmc_set_timing(card->host, timing);
546 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
547 }
548
549 return 0;
550 }
551
552 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
553 {
554 int current_limit = 0;
555 int err;
556
557 /*
558 * Current limit switch is only defined for SDR50, SDR104, and DDR50
559 * bus speed modes. For other bus speed modes, we set the default
560 * current limit of 200mA.
561 */
562 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
563 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
564 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) {
565 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
566 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
567 current_limit = SD_SET_CURRENT_LIMIT_800;
568 else if (card->sw_caps.sd3_curr_limit &
569 SD_MAX_CURRENT_600)
570 current_limit = SD_SET_CURRENT_LIMIT_600;
571 else if (card->sw_caps.sd3_curr_limit &
572 SD_MAX_CURRENT_400)
573 current_limit = SD_SET_CURRENT_LIMIT_400;
574 else if (card->sw_caps.sd3_curr_limit &
575 SD_MAX_CURRENT_200)
576 current_limit = SD_SET_CURRENT_LIMIT_200;
577 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
578 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
579 current_limit = SD_SET_CURRENT_LIMIT_600;
580 else if (card->sw_caps.sd3_curr_limit &
581 SD_MAX_CURRENT_400)
582 current_limit = SD_SET_CURRENT_LIMIT_400;
583 else if (card->sw_caps.sd3_curr_limit &
584 SD_MAX_CURRENT_200)
585 current_limit = SD_SET_CURRENT_LIMIT_200;
586 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
587 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
588 current_limit = SD_SET_CURRENT_LIMIT_400;
589 else if (card->sw_caps.sd3_curr_limit &
590 SD_MAX_CURRENT_200)
591 current_limit = SD_SET_CURRENT_LIMIT_200;
592 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
593 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
594 current_limit = SD_SET_CURRENT_LIMIT_200;
595 }
596 } else
597 current_limit = SD_SET_CURRENT_LIMIT_200;
598
599 err = mmc_sd_switch(card, 1, 3, current_limit, status);
600 if (err)
601 return err;
602
603 if (((status[15] >> 4) & 0x0F) != current_limit)
604 printk(KERN_WARNING "%s: Problem setting current limit!\n",
605 mmc_hostname(card->host));
606
607 return 0;
608 }
609
610 /*
611 * UHS-I specific initialization procedure
612 */
613 static int mmc_sd_init_uhs_card(struct mmc_card *card)
614 {
615 int err;
616 u8 *status;
617
618 if (!card->scr.sda_spec3)
619 return 0;
620
621 if (!(card->csd.cmdclass & CCC_SWITCH))
622 return 0;
623
624 status = kmalloc(64, GFP_KERNEL);
625 if (!status) {
626 printk(KERN_ERR "%s: could not allocate a buffer for "
627 "switch capabilities.\n", mmc_hostname(card->host));
628 return -ENOMEM;
629 }
630
631 /* Set 4-bit bus width */
632 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
633 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
634 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
635 if (err)
636 goto out;
637
638 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
639 }
640
641 /*
642 * Select the bus speed mode depending on host
643 * and card capability.
644 */
645 sd_update_bus_speed_mode(card);
646
647 /* Set the driver strength for the card */
648 err = sd_select_driver_type(card, status);
649 if (err)
650 goto out;
651
652 /* Set current limit for the card */
653 err = sd_set_current_limit(card, status);
654 if (err)
655 goto out;
656
657 /* Set bus speed mode of the card */
658 err = sd_set_bus_speed_mode(card, status);
659 if (err)
660 goto out;
661
662 /* SPI mode doesn't define CMD19 */
663 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
664 err = card->host->ops->execute_tuning(card->host);
665
666 out:
667 kfree(status);
668
669 return err;
670 }
671
672 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
673 card->raw_cid[2], card->raw_cid[3]);
674 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
675 card->raw_csd[2], card->raw_csd[3]);
676 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
677 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
678 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
679 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
680 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
681 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
682 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
683 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
684 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
685 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
686
687
688 static struct attribute *sd_std_attrs[] = {
689 &dev_attr_cid.attr,
690 &dev_attr_csd.attr,
691 &dev_attr_scr.attr,
692 &dev_attr_date.attr,
693 &dev_attr_erase_size.attr,
694 &dev_attr_preferred_erase_size.attr,
695 &dev_attr_fwrev.attr,
696 &dev_attr_hwrev.attr,
697 &dev_attr_manfid.attr,
698 &dev_attr_name.attr,
699 &dev_attr_oemid.attr,
700 &dev_attr_serial.attr,
701 NULL,
702 };
703
704 static struct attribute_group sd_std_attr_group = {
705 .attrs = sd_std_attrs,
706 };
707
708 static const struct attribute_group *sd_attr_groups[] = {
709 &sd_std_attr_group,
710 NULL,
711 };
712
713 struct device_type sd_type = {
714 .groups = sd_attr_groups,
715 };
716
717 /*
718 * Fetch CID from card.
719 */
720 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
721 {
722 int err;
723
724 /*
725 * Since we're changing the OCR value, we seem to
726 * need to tell some cards to go back to the idle
727 * state. We wait 1ms to give cards time to
728 * respond.
729 */
730 mmc_go_idle(host);
731
732 /*
733 * If SD_SEND_IF_COND indicates an SD 2.0
734 * compliant card and we should set bit 30
735 * of the ocr to indicate that we can handle
736 * block-addressed SDHC cards.
737 */
738 err = mmc_send_if_cond(host, ocr);
739 if (!err)
740 ocr |= SD_OCR_CCS;
741
742 /*
743 * If the host supports one of UHS-I modes, request the card
744 * to switch to 1.8V signaling level.
745 */
746 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
747 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
748 ocr |= SD_OCR_S18R;
749
750 /* If the host can supply more than 150mA, XPC should be set to 1. */
751 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 |
752 MMC_CAP_SET_XPC_180))
753 ocr |= SD_OCR_XPC;
754
755 try_again:
756 err = mmc_send_app_op_cond(host, ocr, rocr);
757 if (err)
758 return err;
759
760 /*
761 * In case CCS and S18A in the response is set, start Signal Voltage
762 * Switch procedure. SPI mode doesn't support CMD11.
763 */
764 if (!mmc_host_is_spi(host) && rocr &&
765 ((*rocr & 0x41000000) == 0x41000000)) {
766 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
767 if (err) {
768 ocr &= ~SD_OCR_S18R;
769 goto try_again;
770 }
771 }
772
773 if (mmc_host_is_spi(host))
774 err = mmc_send_cid(host, cid);
775 else
776 err = mmc_all_send_cid(host, cid);
777
778 return err;
779 }
780
781 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
782 {
783 int err;
784
785 /*
786 * Fetch CSD from card.
787 */
788 err = mmc_send_csd(card, card->raw_csd);
789 if (err)
790 return err;
791
792 err = mmc_decode_csd(card);
793 if (err)
794 return err;
795
796 return 0;
797 }
798
799 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
800 bool reinit)
801 {
802 int err;
803
804 if (!reinit) {
805 /*
806 * Fetch SCR from card.
807 */
808 err = mmc_app_send_scr(card, card->raw_scr);
809 if (err)
810 return err;
811
812 err = mmc_decode_scr(card);
813 if (err)
814 return err;
815
816 /*
817 * Fetch and process SD Status register.
818 */
819 err = mmc_read_ssr(card);
820 if (err)
821 return err;
822
823 /* Erase init depends on CSD and SSR */
824 mmc_init_erase(card);
825
826 /*
827 * Fetch switch information from card.
828 */
829 err = mmc_read_switch(card);
830 if (err)
831 return err;
832 }
833
834 /*
835 * For SPI, enable CRC as appropriate.
836 * This CRC enable is located AFTER the reading of the
837 * card registers because some SDHC cards are not able
838 * to provide valid CRCs for non-512-byte blocks.
839 */
840 if (mmc_host_is_spi(host)) {
841 err = mmc_spi_set_crc(host, use_spi_crc);
842 if (err)
843 return err;
844 }
845
846 /*
847 * Check if read-only switch is active.
848 */
849 if (!reinit) {
850 int ro = -1;
851
852 if (host->ops->get_ro)
853 ro = host->ops->get_ro(host);
854
855 if (ro < 0) {
856 printk(KERN_WARNING "%s: host does not "
857 "support reading read-only "
858 "switch. assuming write-enable.\n",
859 mmc_hostname(host));
860 } else if (ro > 0) {
861 mmc_card_set_readonly(card);
862 }
863 }
864
865 return 0;
866 }
867
868 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
869 {
870 unsigned max_dtr = (unsigned int)-1;
871
872 if (mmc_card_highspeed(card)) {
873 if (max_dtr > card->sw_caps.hs_max_dtr)
874 max_dtr = card->sw_caps.hs_max_dtr;
875 } else if (max_dtr > card->csd.max_dtr) {
876 max_dtr = card->csd.max_dtr;
877 }
878
879 return max_dtr;
880 }
881
882 void mmc_sd_go_highspeed(struct mmc_card *card)
883 {
884 mmc_card_set_highspeed(card);
885 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
886 }
887
888 /*
889 * Handle the detection and initialisation of a card.
890 *
891 * In the case of a resume, "oldcard" will contain the card
892 * we're trying to reinitialise.
893 */
894 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
895 struct mmc_card *oldcard)
896 {
897 struct mmc_card *card;
898 int err;
899 u32 cid[4];
900 u32 rocr = 0;
901
902 BUG_ON(!host);
903 WARN_ON(!host->claimed);
904
905 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
906 if (err)
907 return err;
908
909 if (oldcard) {
910 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
911 return -ENOENT;
912
913 card = oldcard;
914 } else {
915 /*
916 * Allocate card structure.
917 */
918 card = mmc_alloc_card(host, &sd_type);
919 if (IS_ERR(card))
920 return PTR_ERR(card);
921
922 card->type = MMC_TYPE_SD;
923 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
924 }
925
926 /*
927 * For native busses: get card RCA and quit open drain mode.
928 */
929 if (!mmc_host_is_spi(host)) {
930 err = mmc_send_relative_addr(host, &card->rca);
931 if (err)
932 return err;
933
934 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
935 }
936
937 if (!oldcard) {
938 err = mmc_sd_get_csd(host, card);
939 if (err)
940 return err;
941
942 mmc_decode_cid(card);
943 }
944
945 /*
946 * Select card, as all following commands rely on that.
947 */
948 if (!mmc_host_is_spi(host)) {
949 err = mmc_select_card(card);
950 if (err)
951 return err;
952 }
953
954 err = mmc_sd_setup_card(host, card, oldcard != NULL);
955 if (err)
956 goto free_card;
957
958 /* Initialization sequence for UHS-I cards */
959 if (rocr & SD_ROCR_S18A) {
960 err = mmc_sd_init_uhs_card(card);
961 if (err)
962 goto free_card;
963
964 /* Card is an ultra-high-speed card */
965 mmc_sd_card_set_uhs(card);
966
967 /*
968 * Since initialization is now complete, enable preset
969 * value registers for UHS-I cards.
970 */
971 if (host->ops->enable_preset_value)
972 host->ops->enable_preset_value(host, true);
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_sd_go_highspeed(card);
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 callback from host.
1025 */
1026 static void mmc_sd_detect(struct mmc_host *host)
1027 {
1028 int err;
1029
1030 BUG_ON(!host);
1031 BUG_ON(!host->card);
1032
1033 mmc_claim_host(host);
1034
1035 /*
1036 * Just check if our card has been removed.
1037 */
1038 err = mmc_send_status(host->card, NULL);
1039
1040 mmc_release_host(host);
1041
1042 if (err) {
1043 mmc_sd_remove(host);
1044
1045 mmc_claim_host(host);
1046 mmc_detach_bus(host);
1047 mmc_release_host(host);
1048 }
1049 }
1050
1051 /*
1052 * Suspend callback from host.
1053 */
1054 static int mmc_sd_suspend(struct mmc_host *host)
1055 {
1056 BUG_ON(!host);
1057 BUG_ON(!host->card);
1058
1059 mmc_claim_host(host);
1060 if (!mmc_host_is_spi(host))
1061 mmc_deselect_cards(host);
1062 host->card->state &= ~MMC_STATE_HIGHSPEED;
1063 mmc_release_host(host);
1064
1065 return 0;
1066 }
1067
1068 /*
1069 * Resume callback from host.
1070 *
1071 * This function tries to determine if the same card is still present
1072 * and, if so, restore all state to it.
1073 */
1074 static int mmc_sd_resume(struct mmc_host *host)
1075 {
1076 int err;
1077
1078 BUG_ON(!host);
1079 BUG_ON(!host->card);
1080
1081 mmc_claim_host(host);
1082 err = mmc_sd_init_card(host, host->ocr, host->card);
1083 mmc_release_host(host);
1084
1085 return err;
1086 }
1087
1088 static int mmc_sd_power_restore(struct mmc_host *host)
1089 {
1090 int ret;
1091
1092 host->card->state &= ~MMC_STATE_HIGHSPEED;
1093 mmc_claim_host(host);
1094 ret = mmc_sd_init_card(host, host->ocr, host->card);
1095 mmc_release_host(host);
1096
1097 return ret;
1098 }
1099
1100 static const struct mmc_bus_ops mmc_sd_ops = {
1101 .remove = mmc_sd_remove,
1102 .detect = mmc_sd_detect,
1103 .suspend = NULL,
1104 .resume = NULL,
1105 .power_restore = mmc_sd_power_restore,
1106 };
1107
1108 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1109 .remove = mmc_sd_remove,
1110 .detect = mmc_sd_detect,
1111 .suspend = mmc_sd_suspend,
1112 .resume = mmc_sd_resume,
1113 .power_restore = mmc_sd_power_restore,
1114 };
1115
1116 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1117 {
1118 const struct mmc_bus_ops *bus_ops;
1119
1120 if (!mmc_card_is_removable(host))
1121 bus_ops = &mmc_sd_ops_unsafe;
1122 else
1123 bus_ops = &mmc_sd_ops;
1124 mmc_attach_bus(host, bus_ops);
1125 }
1126
1127 /*
1128 * Starting point for SD card init.
1129 */
1130 int mmc_attach_sd(struct mmc_host *host)
1131 {
1132 int err;
1133 u32 ocr;
1134
1135 BUG_ON(!host);
1136 WARN_ON(!host->claimed);
1137
1138 /* Make sure we are at 3.3V signalling voltage */
1139 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
1140 if (err)
1141 return err;
1142
1143 /* Disable preset value enable if already set since last time */
1144 if (host->ops->enable_preset_value)
1145 host->ops->enable_preset_value(host, false);
1146
1147 err = mmc_send_app_op_cond(host, 0, &ocr);
1148 if (err)
1149 return err;
1150
1151 mmc_sd_attach_bus_ops(host);
1152 if (host->ocr_avail_sd)
1153 host->ocr_avail = host->ocr_avail_sd;
1154
1155 /*
1156 * We need to get OCR a different way for SPI.
1157 */
1158 if (mmc_host_is_spi(host)) {
1159 mmc_go_idle(host);
1160
1161 err = mmc_spi_read_ocr(host, 0, &ocr);
1162 if (err)
1163 goto err;
1164 }
1165
1166 /*
1167 * Sanity check the voltages that the card claims to
1168 * support.
1169 */
1170 if (ocr & 0x7F) {
1171 printk(KERN_WARNING "%s: card claims to support voltages "
1172 "below the defined range. These will be ignored.\n",
1173 mmc_hostname(host));
1174 ocr &= ~0x7F;
1175 }
1176
1177 if ((ocr & MMC_VDD_165_195) &&
1178 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1179 printk(KERN_WARNING "%s: SD card claims to support the "
1180 "incompletely defined 'low voltage range'. This "
1181 "will be ignored.\n", mmc_hostname(host));
1182 ocr &= ~MMC_VDD_165_195;
1183 }
1184
1185 host->ocr = mmc_select_voltage(host, ocr);
1186
1187 /*
1188 * Can we support the voltage(s) of the card(s)?
1189 */
1190 if (!host->ocr) {
1191 err = -EINVAL;
1192 goto err;
1193 }
1194
1195 /*
1196 * Detect and init the card.
1197 */
1198 err = mmc_sd_init_card(host, host->ocr, NULL);
1199 if (err)
1200 goto err;
1201
1202 mmc_release_host(host);
1203 err = mmc_add_card(host->card);
1204 mmc_claim_host(host);
1205 if (err)
1206 goto remove_card;
1207
1208 return 0;
1209
1210 remove_card:
1211 mmc_release_host(host);
1212 mmc_remove_card(host->card);
1213 host->card = NULL;
1214 mmc_claim_host(host);
1215 err:
1216 mmc_detach_bus(host);
1217
1218 printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
1219 mmc_hostname(host), err);
1220
1221 return err;
1222 }
1223
linux-next