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staging:iio:dac:ad5791: Allow asymmetrical reference voltages
[zen-stable.git] / drivers / mmc / core / sd.c
blob633975ff2bb395f6e2e883c2e7ce05fb51ed8df2
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 int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
473 {
474 unsigned int bus_speed = 0, timing = 0;
475 int err;
476
477 /*
478 * If the host doesn't support any of the UHS-I modes, fallback on
479 * default speed.
480 */
481 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
482 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
483 return 0;
484
485 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
486 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
487 bus_speed = UHS_SDR104_BUS_SPEED;
488 timing = MMC_TIMING_UHS_SDR104;
489 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
490 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
491 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
492 bus_speed = UHS_DDR50_BUS_SPEED;
493 timing = MMC_TIMING_UHS_DDR50;
494 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
495 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
496 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
497 SD_MODE_UHS_SDR50)) {
498 bus_speed = UHS_SDR50_BUS_SPEED;
499 timing = MMC_TIMING_UHS_SDR50;
500 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
501 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
502 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
503 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
504 bus_speed = UHS_SDR25_BUS_SPEED;
505 timing = MMC_TIMING_UHS_SDR25;
506 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
507 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
508 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
509 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
510 SD_MODE_UHS_SDR12)) {
511 bus_speed = UHS_SDR12_BUS_SPEED;
512 timing = MMC_TIMING_UHS_SDR12;
513 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
514 }
515
516 card->sd_bus_speed = bus_speed;
517 err = mmc_sd_switch(card, 1, 0, bus_speed, status);
518 if (err)
519 return err;
520
521 if ((status[16] & 0xF) != bus_speed)
522 printk(KERN_WARNING "%s: Problem setting bus speed mode!\n",
523 mmc_hostname(card->host));
524 else {
525 mmc_set_timing(card->host, timing);
526 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
527 }
528
529 return 0;
530 }
531
532 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
533 {
534 int current_limit = 0;
535 int err;
536
537 /*
538 * Current limit switch is only defined for SDR50, SDR104, and DDR50
539 * bus speed modes. For other bus speed modes, we set the default
540 * current limit of 200mA.
541 */
542 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
543 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
544 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) {
545 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
546 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
547 current_limit = SD_SET_CURRENT_LIMIT_800;
548 else if (card->sw_caps.sd3_curr_limit &
549 SD_MAX_CURRENT_600)
550 current_limit = SD_SET_CURRENT_LIMIT_600;
551 else if (card->sw_caps.sd3_curr_limit &
552 SD_MAX_CURRENT_400)
553 current_limit = SD_SET_CURRENT_LIMIT_400;
554 else if (card->sw_caps.sd3_curr_limit &
555 SD_MAX_CURRENT_200)
556 current_limit = SD_SET_CURRENT_LIMIT_200;
557 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
558 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
559 current_limit = SD_SET_CURRENT_LIMIT_600;
560 else if (card->sw_caps.sd3_curr_limit &
561 SD_MAX_CURRENT_400)
562 current_limit = SD_SET_CURRENT_LIMIT_400;
563 else if (card->sw_caps.sd3_curr_limit &
564 SD_MAX_CURRENT_200)
565 current_limit = SD_SET_CURRENT_LIMIT_200;
566 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
567 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
568 current_limit = SD_SET_CURRENT_LIMIT_400;
569 else if (card->sw_caps.sd3_curr_limit &
570 SD_MAX_CURRENT_200)
571 current_limit = SD_SET_CURRENT_LIMIT_200;
572 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
573 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
574 current_limit = SD_SET_CURRENT_LIMIT_200;
575 }
576 } else
577 current_limit = SD_SET_CURRENT_LIMIT_200;
578
579 err = mmc_sd_switch(card, 1, 3, current_limit, status);
580 if (err)
581 return err;
582
583 if (((status[15] >> 4) & 0x0F) != current_limit)
584 printk(KERN_WARNING "%s: Problem setting current limit!\n",
585 mmc_hostname(card->host));
586
587 return 0;
588 }
589
590 /*
591 * UHS-I specific initialization procedure
592 */
593 static int mmc_sd_init_uhs_card(struct mmc_card *card)
594 {
595 int err;
596 u8 *status;
597
598 if (!card->scr.sda_spec3)
599 return 0;
600
601 if (!(card->csd.cmdclass & CCC_SWITCH))
602 return 0;
603
604 status = kmalloc(64, GFP_KERNEL);
605 if (!status) {
606 printk(KERN_ERR "%s: could not allocate a buffer for "
607 "switch capabilities.\n", mmc_hostname(card->host));
608 return -ENOMEM;
609 }
610
611 /* Set 4-bit bus width */
612 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
613 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
614 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
615 if (err)
616 goto out;
617
618 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
619 }
620
621 /* Set the driver strength for the card */
622 err = sd_select_driver_type(card, status);
623 if (err)
624 goto out;
625
626 /* Set bus speed mode of the card */
627 err = sd_set_bus_speed_mode(card, status);
628 if (err)
629 goto out;
630
631 /* Set current limit for the card */
632 err = sd_set_current_limit(card, status);
633 if (err)
634 goto out;
635
636 /* SPI mode doesn't define CMD19 */
637 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
638 err = card->host->ops->execute_tuning(card->host);
639
640 out:
641 kfree(status);
642
643 return err;
644 }
645
646 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
647 card->raw_cid[2], card->raw_cid[3]);
648 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
649 card->raw_csd[2], card->raw_csd[3]);
650 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
651 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
652 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
653 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
654 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
655 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
656 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
657 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
658 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
659 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
660
661
662 static struct attribute *sd_std_attrs[] = {
663 &dev_attr_cid.attr,
664 &dev_attr_csd.attr,
665 &dev_attr_scr.attr,
666 &dev_attr_date.attr,
667 &dev_attr_erase_size.attr,
668 &dev_attr_preferred_erase_size.attr,
669 &dev_attr_fwrev.attr,
670 &dev_attr_hwrev.attr,
671 &dev_attr_manfid.attr,
672 &dev_attr_name.attr,
673 &dev_attr_oemid.attr,
674 &dev_attr_serial.attr,
675 NULL,
676 };
677
678 static struct attribute_group sd_std_attr_group = {
679 .attrs = sd_std_attrs,
680 };
681
682 static const struct attribute_group *sd_attr_groups[] = {
683 &sd_std_attr_group,
684 NULL,
685 };
686
687 struct device_type sd_type = {
688 .groups = sd_attr_groups,
689 };
690
691 /*
692 * Fetch CID from card.
693 */
694 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
695 {
696 int err;
697
698 /*
699 * Since we're changing the OCR value, we seem to
700 * need to tell some cards to go back to the idle
701 * state. We wait 1ms to give cards time to
702 * respond.
703 */
704 mmc_go_idle(host);
705
706 /*
707 * If SD_SEND_IF_COND indicates an SD 2.0
708 * compliant card and we should set bit 30
709 * of the ocr to indicate that we can handle
710 * block-addressed SDHC cards.
711 */
712 err = mmc_send_if_cond(host, ocr);
713 if (!err)
714 ocr |= SD_OCR_CCS;
715
716 /*
717 * If the host supports one of UHS-I modes, request the card
718 * to switch to 1.8V signaling level.
719 */
720 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
721 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
722 ocr |= SD_OCR_S18R;
723
724 /* If the host can supply more than 150mA, XPC should be set to 1. */
725 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 |
726 MMC_CAP_SET_XPC_180))
727 ocr |= SD_OCR_XPC;
728
729 try_again:
730 err = mmc_send_app_op_cond(host, ocr, rocr);
731 if (err)
732 return err;
733
734 /*
735 * In case CCS and S18A in the response is set, start Signal Voltage
736 * Switch procedure. SPI mode doesn't support CMD11.
737 */
738 if (!mmc_host_is_spi(host) && rocr &&
739 ((*rocr & 0x41000000) == 0x41000000)) {
740 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
741 if (err) {
742 ocr &= ~SD_OCR_S18R;
743 goto try_again;
744 }
745 }
746
747 if (mmc_host_is_spi(host))
748 err = mmc_send_cid(host, cid);
749 else
750 err = mmc_all_send_cid(host, cid);
751
752 return err;
753 }
754
755 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
756 {
757 int err;
758
759 /*
760 * Fetch CSD from card.
761 */
762 err = mmc_send_csd(card, card->raw_csd);
763 if (err)
764 return err;
765
766 err = mmc_decode_csd(card);
767 if (err)
768 return err;
769
770 return 0;
771 }
772
773 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
774 bool reinit)
775 {
776 int err;
777
778 if (!reinit) {
779 /*
780 * Fetch SCR from card.
781 */
782 err = mmc_app_send_scr(card, card->raw_scr);
783 if (err)
784 return err;
785
786 err = mmc_decode_scr(card);
787 if (err)
788 return err;
789
790 /*
791 * Fetch and process SD Status register.
792 */
793 err = mmc_read_ssr(card);
794 if (err)
795 return err;
796
797 /* Erase init depends on CSD and SSR */
798 mmc_init_erase(card);
799
800 /*
801 * Fetch switch information from card.
802 */
803 err = mmc_read_switch(card);
804 if (err)
805 return err;
806 }
807
808 /*
809 * For SPI, enable CRC as appropriate.
810 * This CRC enable is located AFTER the reading of the
811 * card registers because some SDHC cards are not able
812 * to provide valid CRCs for non-512-byte blocks.
813 */
814 if (mmc_host_is_spi(host)) {
815 err = mmc_spi_set_crc(host, use_spi_crc);
816 if (err)
817 return err;
818 }
819
820 /*
821 * Check if read-only switch is active.
822 */
823 if (!reinit) {
824 int ro = -1;
825
826 if (host->ops->get_ro)
827 ro = host->ops->get_ro(host);
828
829 if (ro < 0) {
830 printk(KERN_WARNING "%s: host does not "
831 "support reading read-only "
832 "switch. assuming write-enable.\n",
833 mmc_hostname(host));
834 } else if (ro > 0) {
835 mmc_card_set_readonly(card);
836 }
837 }
838
839 return 0;
840 }
841
842 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
843 {
844 unsigned max_dtr = (unsigned int)-1;
845
846 if (mmc_card_highspeed(card)) {
847 if (max_dtr > card->sw_caps.hs_max_dtr)
848 max_dtr = card->sw_caps.hs_max_dtr;
849 } else if (max_dtr > card->csd.max_dtr) {
850 max_dtr = card->csd.max_dtr;
851 }
852
853 return max_dtr;
854 }
855
856 void mmc_sd_go_highspeed(struct mmc_card *card)
857 {
858 mmc_card_set_highspeed(card);
859 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
860 }
861
862 /*
863 * Handle the detection and initialisation of a card.
864 *
865 * In the case of a resume, "oldcard" will contain the card
866 * we're trying to reinitialise.
867 */
868 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
869 struct mmc_card *oldcard)
870 {
871 struct mmc_card *card;
872 int err;
873 u32 cid[4];
874 u32 rocr = 0;
875
876 BUG_ON(!host);
877 WARN_ON(!host->claimed);
878
879 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
880 if (err)
881 return err;
882
883 if (oldcard) {
884 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
885 return -ENOENT;
886
887 card = oldcard;
888 } else {
889 /*
890 * Allocate card structure.
891 */
892 card = mmc_alloc_card(host, &sd_type);
893 if (IS_ERR(card))
894 return PTR_ERR(card);
895
896 card->type = MMC_TYPE_SD;
897 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
898 }
899
900 /*
901 * For native busses: get card RCA and quit open drain mode.
902 */
903 if (!mmc_host_is_spi(host)) {
904 err = mmc_send_relative_addr(host, &card->rca);
905 if (err)
906 return err;
907
908 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
909 }
910
911 if (!oldcard) {
912 err = mmc_sd_get_csd(host, card);
913 if (err)
914 return err;
915
916 mmc_decode_cid(card);
917 }
918
919 /*
920 * Select card, as all following commands rely on that.
921 */
922 if (!mmc_host_is_spi(host)) {
923 err = mmc_select_card(card);
924 if (err)
925 return err;
926 }
927
928 err = mmc_sd_setup_card(host, card, oldcard != NULL);
929 if (err)
930 goto free_card;
931
932 /* Initialization sequence for UHS-I cards */
933 if (rocr & SD_ROCR_S18A) {
934 err = mmc_sd_init_uhs_card(card);
935 if (err)
936 goto free_card;
937
938 /* Card is an ultra-high-speed card */
939 mmc_sd_card_set_uhs(card);
940
941 /*
942 * Since initialization is now complete, enable preset
943 * value registers for UHS-I cards.
944 */
945 if (host->ops->enable_preset_value)
946 host->ops->enable_preset_value(host, true);
947 } else {
948 /*
949 * Attempt to change to high-speed (if supported)
950 */
951 err = mmc_sd_switch_hs(card);
952 if (err > 0)
953 mmc_sd_go_highspeed(card);
954 else if (err)
955 goto free_card;
956
957 /*
958 * Set bus speed.
959 */
960 mmc_set_clock(host, mmc_sd_get_max_clock(card));
961
962 /*
963 * Switch to wider bus (if supported).
964 */
965 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
966 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
967 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
968 if (err)
969 goto free_card;
970
971 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
972 }
973 }
974
975 host->card = card;
976 return 0;
977
978 free_card:
979 if (!oldcard)
980 mmc_remove_card(card);
981
982 return err;
983 }
984
985 /*
986 * Host is being removed. Free up the current card.
987 */
988 static void mmc_sd_remove(struct mmc_host *host)
989 {
990 BUG_ON(!host);
991 BUG_ON(!host->card);
992
993 mmc_remove_card(host->card);
994 host->card = NULL;
995 }
996
997 /*
998 * Card detection callback from host.
999 */
1000 static void mmc_sd_detect(struct mmc_host *host)
1001 {
1002 int err;
1003
1004 BUG_ON(!host);
1005 BUG_ON(!host->card);
1006
1007 mmc_claim_host(host);
1008
1009 /*
1010 * Just check if our card has been removed.
1011 */
1012 err = mmc_send_status(host->card, NULL);
1013
1014 mmc_release_host(host);
1015
1016 if (err) {
1017 mmc_sd_remove(host);
1018
1019 mmc_claim_host(host);
1020 mmc_detach_bus(host);
1021 mmc_release_host(host);
1022 }
1023 }
1024
1025 /*
1026 * Suspend callback from host.
1027 */
1028 static int mmc_sd_suspend(struct mmc_host *host)
1029 {
1030 BUG_ON(!host);
1031 BUG_ON(!host->card);
1032
1033 mmc_claim_host(host);
1034 if (!mmc_host_is_spi(host))
1035 mmc_deselect_cards(host);
1036 host->card->state &= ~MMC_STATE_HIGHSPEED;
1037 mmc_release_host(host);
1038
1039 return 0;
1040 }
1041
1042 /*
1043 * Resume callback from host.
1044 *
1045 * This function tries to determine if the same card is still present
1046 * and, if so, restore all state to it.
1047 */
1048 static int mmc_sd_resume(struct mmc_host *host)
1049 {
1050 int err;
1051
1052 BUG_ON(!host);
1053 BUG_ON(!host->card);
1054
1055 mmc_claim_host(host);
1056 err = mmc_sd_init_card(host, host->ocr, host->card);
1057 mmc_release_host(host);
1058
1059 return err;
1060 }
1061
1062 static int mmc_sd_power_restore(struct mmc_host *host)
1063 {
1064 int ret;
1065
1066 host->card->state &= ~MMC_STATE_HIGHSPEED;
1067 mmc_claim_host(host);
1068 ret = mmc_sd_init_card(host, host->ocr, host->card);
1069 mmc_release_host(host);
1070
1071 return ret;
1072 }
1073
1074 static const struct mmc_bus_ops mmc_sd_ops = {
1075 .remove = mmc_sd_remove,
1076 .detect = mmc_sd_detect,
1077 .suspend = NULL,
1078 .resume = NULL,
1079 .power_restore = mmc_sd_power_restore,
1080 };
1081
1082 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1083 .remove = mmc_sd_remove,
1084 .detect = mmc_sd_detect,
1085 .suspend = mmc_sd_suspend,
1086 .resume = mmc_sd_resume,
1087 .power_restore = mmc_sd_power_restore,
1088 };
1089
1090 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1091 {
1092 const struct mmc_bus_ops *bus_ops;
1093
1094 if (!mmc_card_is_removable(host))
1095 bus_ops = &mmc_sd_ops_unsafe;
1096 else
1097 bus_ops = &mmc_sd_ops;
1098 mmc_attach_bus(host, bus_ops);
1099 }
1100
1101 /*
1102 * Starting point for SD card init.
1103 */
1104 int mmc_attach_sd(struct mmc_host *host)
1105 {
1106 int err;
1107 u32 ocr;
1108
1109 BUG_ON(!host);
1110 WARN_ON(!host->claimed);
1111
1112 /* Make sure we are at 3.3V signalling voltage */
1113 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
1114 if (err)
1115 return err;
1116
1117 /* Disable preset value enable if already set since last time */
1118 if (host->ops->enable_preset_value)
1119 host->ops->enable_preset_value(host, false);
1120
1121 err = mmc_send_app_op_cond(host, 0, &ocr);
1122 if (err)
1123 return err;
1124
1125 mmc_sd_attach_bus_ops(host);
1126 if (host->ocr_avail_sd)
1127 host->ocr_avail = host->ocr_avail_sd;
1128
1129 /*
1130 * We need to get OCR a different way for SPI.
1131 */
1132 if (mmc_host_is_spi(host)) {
1133 mmc_go_idle(host);
1134
1135 err = mmc_spi_read_ocr(host, 0, &ocr);
1136 if (err)
1137 goto err;
1138 }
1139
1140 /*
1141 * Sanity check the voltages that the card claims to
1142 * support.
1143 */
1144 if (ocr & 0x7F) {
1145 printk(KERN_WARNING "%s: card claims to support voltages "
1146 "below the defined range. These will be ignored.\n",
1147 mmc_hostname(host));
1148 ocr &= ~0x7F;
1149 }
1150
1151 if ((ocr & MMC_VDD_165_195) &&
1152 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1153 printk(KERN_WARNING "%s: SD card claims to support the "
1154 "incompletely defined 'low voltage range'. This "
1155 "will be ignored.\n", mmc_hostname(host));
1156 ocr &= ~MMC_VDD_165_195;
1157 }
1158
1159 host->ocr = mmc_select_voltage(host, ocr);
1160
1161 /*
1162 * Can we support the voltage(s) of the card(s)?
1163 */
1164 if (!host->ocr) {
1165 err = -EINVAL;
1166 goto err;
1167 }
1168
1169 /*
1170 * Detect and init the card.
1171 */
1172 err = mmc_sd_init_card(host, host->ocr, NULL);
1173 if (err)
1174 goto err;
1175
1176 mmc_release_host(host);
1177 err = mmc_add_card(host->card);
1178 mmc_claim_host(host);
1179 if (err)
1180 goto remove_card;
1181
1182 return 0;
1183
1184 remove_card:
1185 mmc_release_host(host);
1186 mmc_remove_card(host->card);
1187 host->card = NULL;
1188 mmc_claim_host(host);
1189 err:
1190 mmc_detach_bus(host);
1191
1192 printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
1193 mmc_hostname(host), err);
1194
1195 return err;
1196 }
1197