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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / mmc / core / sd.c
blobc272c6868ecf6d11a39c3cf2be99f1257fccd026
1 /*
2 * linux/drivers/mmc/core/sd.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/err.h>
14 #include <linux/slab.h>
15 #include <linux/stat.h>
16
17 #include <linux/mmc/host.h>
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/mmc.h>
20 #include <linux/mmc/sd.h>
21
22 #include "core.h"
23 #include "bus.h"
24 #include "mmc_ops.h"
25 #include "sd.h"
26 #include "sd_ops.h"
27
28 static const unsigned int tran_exp[] = {
29 10000, 100000, 1000000, 10000000,
30 0, 0, 0, 0
31 };
32
33 static const unsigned char tran_mant[] = {
34 0, 10, 12, 13, 15, 20, 25, 30,
35 35, 40, 45, 50, 55, 60, 70, 80,
36 };
37
38 static const unsigned int tacc_exp[] = {
39 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
40 };
41
42 static const unsigned int tacc_mant[] = {
43 0, 10, 12, 13, 15, 20, 25, 30,
44 35, 40, 45, 50, 55, 60, 70, 80,
45 };
46
47 #define UNSTUFF_BITS(resp,start,size) \
48 ({ \
49 const int __size = size; \
50 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
51 const int __off = 3 - ((start) / 32); \
52 const int __shft = (start) & 31; \
53 u32 __res; \
54 \
55 __res = resp[__off] >> __shft; \
56 if (__size + __shft > 32) \
57 __res |= resp[__off-1] << ((32 - __shft) % 32); \
58 __res & __mask; \
59 })
60
61 /*
62 * Given the decoded CSD structure, decode the raw CID to our CID structure.
63 */
64 void mmc_decode_cid(struct mmc_card *card)
65 {
66 u32 *resp = card->raw_cid;
67
68 memset(&card->cid, 0, sizeof(struct mmc_cid));
69
70 /*
71 * SD doesn't currently have a version field so we will
72 * have to assume we can parse this.
73 */
74 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
75 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
76 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
77 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
78 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
79 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
80 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
81 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
82 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
83 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
84 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
85 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
86
87 card->cid.year += 2000; /* SD cards year offset */
88 }
89
90 /*
91 * Given a 128-bit response, decode to our card CSD structure.
92 */
93 static int mmc_decode_csd(struct mmc_card *card)
94 {
95 struct mmc_csd *csd = &card->csd;
96 unsigned int e, m, csd_struct;
97 u32 *resp = card->raw_csd;
98
99 csd_struct = UNSTUFF_BITS(resp, 126, 2);
100
101 switch (csd_struct) {
102 case 0:
103 m = UNSTUFF_BITS(resp, 115, 4);
104 e = UNSTUFF_BITS(resp, 112, 3);
105 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
106 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
107
108 m = UNSTUFF_BITS(resp, 99, 4);
109 e = UNSTUFF_BITS(resp, 96, 3);
110 csd->max_dtr = tran_exp[e] * tran_mant[m];
111 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
112
113 e = UNSTUFF_BITS(resp, 47, 3);
114 m = UNSTUFF_BITS(resp, 62, 12);
115 csd->capacity = (1 + m) << (e + 2);
116
117 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
118 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
119 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
120 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
121 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
122 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
123 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
124
125 if (UNSTUFF_BITS(resp, 46, 1)) {
126 csd->erase_size = 1;
127 } else if (csd->write_blkbits >= 9) {
128 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
129 csd->erase_size <<= csd->write_blkbits - 9;
130 }
131 break;
132 case 1:
133 /*
134 * This is a block-addressed SDHC or SDXC card. Most
135 * interesting fields are unused and have fixed
136 * values. To avoid getting tripped by buggy cards,
137 * we assume those fixed values ourselves.
138 */
139 mmc_card_set_blockaddr(card);
140
141 csd->tacc_ns = 0; /* Unused */
142 csd->tacc_clks = 0; /* Unused */
143
144 m = UNSTUFF_BITS(resp, 99, 4);
145 e = UNSTUFF_BITS(resp, 96, 3);
146 csd->max_dtr = tran_exp[e] * tran_mant[m];
147 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
148 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
149
150 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
151 if (csd->c_size >= 0xFFFF)
152 mmc_card_set_ext_capacity(card);
153
154 m = UNSTUFF_BITS(resp, 48, 22);
155 csd->capacity = (1 + m) << 10;
156
157 csd->read_blkbits = 9;
158 csd->read_partial = 0;
159 csd->write_misalign = 0;
160 csd->read_misalign = 0;
161 csd->r2w_factor = 4; /* Unused */
162 csd->write_blkbits = 9;
163 csd->write_partial = 0;
164 csd->erase_size = 1;
165 break;
166 default:
167 pr_err("%s: unrecognised CSD structure version %d\n",
168 mmc_hostname(card->host), csd_struct);
169 return -EINVAL;
170 }
171
172 card->erase_size = csd->erase_size;
173
174 return 0;
175 }
176
177 /*
178 * Given a 64-bit response, decode to our card SCR structure.
179 */
180 static int mmc_decode_scr(struct mmc_card *card)
181 {
182 struct sd_scr *scr = &card->scr;
183 unsigned int scr_struct;
184 u32 resp[4];
185
186 resp[3] = card->raw_scr[1];
187 resp[2] = card->raw_scr[0];
188
189 scr_struct = UNSTUFF_BITS(resp, 60, 4);
190 if (scr_struct != 0) {
191 pr_err("%s: unrecognised SCR structure version %d\n",
192 mmc_hostname(card->host), scr_struct);
193 return -EINVAL;
194 }
195
196 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
197 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
198 if (scr->sda_vsn == SCR_SPEC_VER_2)
199 /* Check if Physical Layer Spec v3.0 is supported */
200 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
201
202 if (UNSTUFF_BITS(resp, 55, 1))
203 card->erased_byte = 0xFF;
204 else
205 card->erased_byte = 0x0;
206
207 if (scr->sda_spec3)
208 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
209 return 0;
210 }
211
212 /*
213 * Fetch and process SD Status register.
214 */
215 static int mmc_read_ssr(struct mmc_card *card)
216 {
217 unsigned int au, es, et, eo;
218 int err, i;
219 u32 *ssr;
220
221 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
222 pr_warning("%s: card lacks mandatory SD Status "
223 "function.\n", mmc_hostname(card->host));
224 return 0;
225 }
226
227 ssr = kmalloc(64, GFP_KERNEL);
228 if (!ssr)
229 return -ENOMEM;
230
231 err = mmc_app_sd_status(card, ssr);
232 if (err) {
233 pr_warning("%s: problem reading SD Status "
234 "register.\n", mmc_hostname(card->host));
235 err = 0;
236 goto out;
237 }
238
239 for (i = 0; i < 16; i++)
240 ssr[i] = be32_to_cpu(ssr[i]);
241
242 /*
243 * UNSTUFF_BITS only works with four u32s so we have to offset the
244 * bitfield positions accordingly.
245 */
246 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
247 if (au > 0 || au <= 9) {
248 card->ssr.au = 1 << (au + 4);
249 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
250 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
251 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
252 if (es && et) {
253 card->ssr.erase_timeout = (et * 1000) / es;
254 card->ssr.erase_offset = eo * 1000;
255 }
256 } else {
257 pr_warning("%s: SD Status: Invalid Allocation Unit "
258 "size.\n", mmc_hostname(card->host));
259 }
260 out:
261 kfree(ssr);
262 return err;
263 }
264
265 /*
266 * Fetches and decodes switch information
267 */
268 static int mmc_read_switch(struct mmc_card *card)
269 {
270 int err;
271 u8 *status;
272
273 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
274 return 0;
275
276 if (!(card->csd.cmdclass & CCC_SWITCH)) {
277 pr_warning("%s: card lacks mandatory switch "
278 "function, performance might suffer.\n",
279 mmc_hostname(card->host));
280 return 0;
281 }
282
283 err = -EIO;
284
285 status = kmalloc(64, GFP_KERNEL);
286 if (!status) {
287 pr_err("%s: could not allocate a buffer for "
288 "switch capabilities.\n",
289 mmc_hostname(card->host));
290 return -ENOMEM;
291 }
292
293 /* 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 pr_warning("%s: problem reading Bus Speed modes.\n",
304 mmc_hostname(card->host));
305 err = 0;
306
307 goto out;
308 }
309
310 if (status[13] & SD_MODE_HIGH_SPEED)
311 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
312
313 if (card->scr.sda_spec3) {
314 card->sw_caps.sd3_bus_mode = status[13];
315
316 /* Find out Driver Strengths supported by the card */
317 err = mmc_sd_switch(card, 0, 2, 1, status);
318 if (err) {
319 /*
320 * If the host or the card can't do the switch,
321 * fail more gracefully.
322 */
323 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
324 goto out;
325
326 pr_warning("%s: problem reading "
327 "Driver Strength.\n",
328 mmc_hostname(card->host));
329 err = 0;
330
331 goto out;
332 }
333
334 card->sw_caps.sd3_drv_type = status[9];
335
336 /* Find out Current Limits supported by the card */
337 err = mmc_sd_switch(card, 0, 3, 1, status);
338 if (err) {
339 /*
340 * If the host or the card can't do the switch,
341 * fail more gracefully.
342 */
343 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
344 goto out;
345
346 pr_warning("%s: problem reading "
347 "Current Limit.\n",
348 mmc_hostname(card->host));
349 err = 0;
350
351 goto out;
352 }
353
354 card->sw_caps.sd3_curr_limit = status[7];
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 pr_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 pr_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 mmc_host_clk_hold(card->host);
455 drive_strength = card->host->ops->select_drive_strength(
456 card->sw_caps.uhs_max_dtr,
457 host_drv_type, card_drv_type);
458 mmc_host_clk_release(card->host);
459
460 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
461 if (err)
462 return err;
463
464 if ((status[15] & 0xF) != drive_strength) {
465 pr_warning("%s: Problem setting drive strength!\n",
466 mmc_hostname(card->host));
467 return 0;
468 }
469
470 mmc_set_driver_type(card->host, drive_strength);
471
472 return 0;
473 }
474
475 static void sd_update_bus_speed_mode(struct mmc_card *card)
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 card->sd_bus_speed = 0;
484 return;
485 }
486
487 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
488 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
489 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
490 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
491 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
492 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
493 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
494 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
495 SD_MODE_UHS_SDR50)) {
496 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
498 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
499 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
500 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
501 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
502 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
503 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
504 SD_MODE_UHS_SDR12)) {
505 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
506 }
507 }
508
509 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
510 {
511 int err;
512 unsigned int timing = 0;
513
514 switch (card->sd_bus_speed) {
515 case UHS_SDR104_BUS_SPEED:
516 timing = MMC_TIMING_UHS_SDR104;
517 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
518 break;
519 case UHS_DDR50_BUS_SPEED:
520 timing = MMC_TIMING_UHS_DDR50;
521 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
522 break;
523 case UHS_SDR50_BUS_SPEED:
524 timing = MMC_TIMING_UHS_SDR50;
525 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
526 break;
527 case UHS_SDR25_BUS_SPEED:
528 timing = MMC_TIMING_UHS_SDR25;
529 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
530 break;
531 case UHS_SDR12_BUS_SPEED:
532 timing = MMC_TIMING_UHS_SDR12;
533 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
534 break;
535 default:
536 return 0;
537 }
538
539 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
540 if (err)
541 return err;
542
543 if ((status[16] & 0xF) != card->sd_bus_speed)
544 pr_warning("%s: Problem setting bus speed mode!\n",
545 mmc_hostname(card->host));
546 else {
547 mmc_set_timing(card->host, timing);
548 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
549 }
550
551 return 0;
552 }
553
554 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
555 {
556 int current_limit = 0;
557 int err;
558
559 /*
560 * Current limit switch is only defined for SDR50, SDR104, and DDR50
561 * bus speed modes. For other bus speed modes, we set the default
562 * current limit of 200mA.
563 */
564 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
565 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
566 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) {
567 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
568 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
569 current_limit = SD_SET_CURRENT_LIMIT_800;
570 else if (card->sw_caps.sd3_curr_limit &
571 SD_MAX_CURRENT_600)
572 current_limit = SD_SET_CURRENT_LIMIT_600;
573 else if (card->sw_caps.sd3_curr_limit &
574 SD_MAX_CURRENT_400)
575 current_limit = SD_SET_CURRENT_LIMIT_400;
576 else if (card->sw_caps.sd3_curr_limit &
577 SD_MAX_CURRENT_200)
578 current_limit = SD_SET_CURRENT_LIMIT_200;
579 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
580 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
581 current_limit = SD_SET_CURRENT_LIMIT_600;
582 else if (card->sw_caps.sd3_curr_limit &
583 SD_MAX_CURRENT_400)
584 current_limit = SD_SET_CURRENT_LIMIT_400;
585 else if (card->sw_caps.sd3_curr_limit &
586 SD_MAX_CURRENT_200)
587 current_limit = SD_SET_CURRENT_LIMIT_200;
588 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
589 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
590 current_limit = SD_SET_CURRENT_LIMIT_400;
591 else if (card->sw_caps.sd3_curr_limit &
592 SD_MAX_CURRENT_200)
593 current_limit = SD_SET_CURRENT_LIMIT_200;
594 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
595 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
596 current_limit = SD_SET_CURRENT_LIMIT_200;
597 }
598 } else
599 current_limit = SD_SET_CURRENT_LIMIT_200;
600
601 err = mmc_sd_switch(card, 1, 3, current_limit, status);
602 if (err)
603 return err;
604
605 if (((status[15] >> 4) & 0x0F) != current_limit)
606 pr_warning("%s: Problem setting current limit!\n",
607 mmc_hostname(card->host));
608
609 return 0;
610 }
611
612 /*
613 * UHS-I specific initialization procedure
614 */
615 static int mmc_sd_init_uhs_card(struct mmc_card *card)
616 {
617 int err;
618 u8 *status;
619
620 if (!card->scr.sda_spec3)
621 return 0;
622
623 if (!(card->csd.cmdclass & CCC_SWITCH))
624 return 0;
625
626 status = kmalloc(64, GFP_KERNEL);
627 if (!status) {
628 pr_err("%s: could not allocate a buffer for "
629 "switch capabilities.\n", mmc_hostname(card->host));
630 return -ENOMEM;
631 }
632
633 /* Set 4-bit bus width */
634 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
635 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
636 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
637 if (err)
638 goto out;
639
640 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
641 }
642
643 /*
644 * Select the bus speed mode depending on host
645 * and card capability.
646 */
647 sd_update_bus_speed_mode(card);
648
649 /* Set the driver strength for the card */
650 err = sd_select_driver_type(card, status);
651 if (err)
652 goto out;
653
654 /* Set current limit for the card */
655 err = sd_set_current_limit(card, status);
656 if (err)
657 goto out;
658
659 /* Set bus speed mode of the card */
660 err = sd_set_bus_speed_mode(card, status);
661 if (err)
662 goto out;
663
664 /* SPI mode doesn't define CMD19 */
665 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) {
666 mmc_host_clk_hold(card->host);
667 err = card->host->ops->execute_tuning(card->host,
668 MMC_SEND_TUNING_BLOCK);
669 mmc_host_clk_release(card->host);
670 }
671
672 out:
673 kfree(status);
674
675 return err;
676 }
677
678 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
679 card->raw_cid[2], card->raw_cid[3]);
680 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
681 card->raw_csd[2], card->raw_csd[3]);
682 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
683 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
684 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
685 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
686 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
687 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
688 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
689 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
690 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
691 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
692
693
694 static struct attribute *sd_std_attrs[] = {
695 &dev_attr_cid.attr,
696 &dev_attr_csd.attr,
697 &dev_attr_scr.attr,
698 &dev_attr_date.attr,
699 &dev_attr_erase_size.attr,
700 &dev_attr_preferred_erase_size.attr,
701 &dev_attr_fwrev.attr,
702 &dev_attr_hwrev.attr,
703 &dev_attr_manfid.attr,
704 &dev_attr_name.attr,
705 &dev_attr_oemid.attr,
706 &dev_attr_serial.attr,
707 NULL,
708 };
709
710 static struct attribute_group sd_std_attr_group = {
711 .attrs = sd_std_attrs,
712 };
713
714 static const struct attribute_group *sd_attr_groups[] = {
715 &sd_std_attr_group,
716 NULL,
717 };
718
719 struct device_type sd_type = {
720 .groups = sd_attr_groups,
721 };
722
723 /*
724 * Fetch CID from card.
725 */
726 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
727 {
728 int err;
729
730 /*
731 * Since we're changing the OCR value, we seem to
732 * need to tell some cards to go back to the idle
733 * state. We wait 1ms to give cards time to
734 * respond.
735 */
736 mmc_go_idle(host);
737
738 /*
739 * If SD_SEND_IF_COND indicates an SD 2.0
740 * compliant card and we should set bit 30
741 * of the ocr to indicate that we can handle
742 * block-addressed SDHC cards.
743 */
744 err = mmc_send_if_cond(host, ocr);
745 if (!err)
746 ocr |= SD_OCR_CCS;
747
748 /*
749 * If the host supports one of UHS-I modes, request the card
750 * to switch to 1.8V signaling level.
751 */
752 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
753 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
754 ocr |= SD_OCR_S18R;
755
756 /* If the host can supply more than 150mA, XPC should be set to 1. */
757 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 |
758 MMC_CAP_SET_XPC_180))
759 ocr |= SD_OCR_XPC;
760
761 try_again:
762 err = mmc_send_app_op_cond(host, ocr, rocr);
763 if (err)
764 return err;
765
766 /*
767 * In case CCS and S18A in the response is set, start Signal Voltage
768 * Switch procedure. SPI mode doesn't support CMD11.
769 */
770 if (!mmc_host_is_spi(host) && rocr &&
771 ((*rocr & 0x41000000) == 0x41000000)) {
772 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
773 if (err) {
774 ocr &= ~SD_OCR_S18R;
775 goto try_again;
776 }
777 }
778
779 if (mmc_host_is_spi(host))
780 err = mmc_send_cid(host, cid);
781 else
782 err = mmc_all_send_cid(host, cid);
783
784 return err;
785 }
786
787 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
788 {
789 int err;
790
791 /*
792 * Fetch CSD from card.
793 */
794 err = mmc_send_csd(card, card->raw_csd);
795 if (err)
796 return err;
797
798 err = mmc_decode_csd(card);
799 if (err)
800 return err;
801
802 return 0;
803 }
804
805 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
806 bool reinit)
807 {
808 int err;
809
810 if (!reinit) {
811 /*
812 * Fetch SCR from card.
813 */
814 err = mmc_app_send_scr(card, card->raw_scr);
815 if (err)
816 return err;
817
818 err = mmc_decode_scr(card);
819 if (err)
820 return err;
821
822 /*
823 * Fetch and process SD Status register.
824 */
825 err = mmc_read_ssr(card);
826 if (err)
827 return err;
828
829 /* Erase init depends on CSD and SSR */
830 mmc_init_erase(card);
831
832 /*
833 * Fetch switch information from card.
834 */
835 err = mmc_read_switch(card);
836 if (err)
837 return err;
838 }
839
840 /*
841 * For SPI, enable CRC as appropriate.
842 * This CRC enable is located AFTER the reading of the
843 * card registers because some SDHC cards are not able
844 * to provide valid CRCs for non-512-byte blocks.
845 */
846 if (mmc_host_is_spi(host)) {
847 err = mmc_spi_set_crc(host, use_spi_crc);
848 if (err)
849 return err;
850 }
851
852 /*
853 * Check if read-only switch is active.
854 */
855 if (!reinit) {
856 int ro = -1;
857
858 if (host->ops->get_ro) {
859 mmc_host_clk_hold(card->host);
860 ro = host->ops->get_ro(host);
861 mmc_host_clk_release(card->host);
862 }
863
864 if (ro < 0) {
865 pr_warning("%s: host does not "
866 "support reading read-only "
867 "switch. assuming write-enable.\n",
868 mmc_hostname(host));
869 } else if (ro > 0) {
870 mmc_card_set_readonly(card);
871 }
872 }
873
874 return 0;
875 }
876
877 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
878 {
879 unsigned max_dtr = (unsigned int)-1;
880
881 if (mmc_card_highspeed(card)) {
882 if (max_dtr > card->sw_caps.hs_max_dtr)
883 max_dtr = card->sw_caps.hs_max_dtr;
884 } else if (max_dtr > card->csd.max_dtr) {
885 max_dtr = card->csd.max_dtr;
886 }
887
888 return max_dtr;
889 }
890
891 void mmc_sd_go_highspeed(struct mmc_card *card)
892 {
893 mmc_card_set_highspeed(card);
894 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
895 }
896
897 /*
898 * Handle the detection and initialisation of a card.
899 *
900 * In the case of a resume, "oldcard" will contain the card
901 * we're trying to reinitialise.
902 */
903 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
904 struct mmc_card *oldcard)
905 {
906 struct mmc_card *card;
907 int err;
908 u32 cid[4];
909 u32 rocr = 0;
910
911 BUG_ON(!host);
912 WARN_ON(!host->claimed);
913
914 /* The initialization should be done at 3.3 V I/O voltage. */
915 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
916
917 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
918 if (err)
919 return err;
920
921 if (oldcard) {
922 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
923 return -ENOENT;
924
925 card = oldcard;
926 } else {
927 /*
928 * Allocate card structure.
929 */
930 card = mmc_alloc_card(host, &sd_type);
931 if (IS_ERR(card))
932 return PTR_ERR(card);
933
934 card->type = MMC_TYPE_SD;
935 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
936 }
937
938 /*
939 * For native busses: get card RCA and quit open drain mode.
940 */
941 if (!mmc_host_is_spi(host)) {
942 err = mmc_send_relative_addr(host, &card->rca);
943 if (err)
944 return err;
945 }
946
947 if (!oldcard) {
948 err = mmc_sd_get_csd(host, card);
949 if (err)
950 return err;
951
952 mmc_decode_cid(card);
953 }
954
955 /*
956 * Select card, as all following commands rely on that.
957 */
958 if (!mmc_host_is_spi(host)) {
959 err = mmc_select_card(card);
960 if (err)
961 return err;
962 }
963
964 err = mmc_sd_setup_card(host, card, oldcard != NULL);
965 if (err)
966 goto free_card;
967
968 /* Initialization sequence for UHS-I cards */
969 if (rocr & SD_ROCR_S18A) {
970 err = mmc_sd_init_uhs_card(card);
971 if (err)
972 goto free_card;
973
974 /* Card is an ultra-high-speed card */
975 mmc_card_set_uhs(card);
976
977 /*
978 * Since initialization is now complete, enable preset
979 * value registers for UHS-I cards.
980 */
981 if (host->ops->enable_preset_value) {
982 mmc_host_clk_hold(card->host);
983 host->ops->enable_preset_value(host, true);
984 mmc_host_clk_release(card->host);
985 }
986 } else {
987 /*
988 * Attempt to change to high-speed (if supported)
989 */
990 err = mmc_sd_switch_hs(card);
991 if (err > 0)
992 mmc_sd_go_highspeed(card);
993 else if (err)
994 goto free_card;
995
996 /*
997 * Set bus speed.
998 */
999 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1000
1001 /*
1002 * Switch to wider bus (if supported).
1003 */
1004 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1005 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1006 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1007 if (err)
1008 goto free_card;
1009
1010 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1011 }
1012 }
1013
1014 host->card = card;
1015 return 0;
1016
1017 free_card:
1018 if (!oldcard)
1019 mmc_remove_card(card);
1020
1021 return err;
1022 }
1023
1024 /*
1025 * Host is being removed. Free up the current card.
1026 */
1027 static void mmc_sd_remove(struct mmc_host *host)
1028 {
1029 BUG_ON(!host);
1030 BUG_ON(!host->card);
1031
1032 mmc_remove_card(host->card);
1033 host->card = NULL;
1034 }
1035
1036 /*
1037 * Card detection - card is alive.
1038 */
1039 static int mmc_sd_alive(struct mmc_host *host)
1040 {
1041 return mmc_send_status(host->card, NULL);
1042 }
1043
1044 /*
1045 * Card detection callback from host.
1046 */
1047 static void mmc_sd_detect(struct mmc_host *host)
1048 {
1049 int err;
1050
1051 BUG_ON(!host);
1052 BUG_ON(!host->card);
1053
1054 mmc_claim_host(host);
1055
1056 /*
1057 * Just check if our card has been removed.
1058 */
1059 err = _mmc_detect_card_removed(host);
1060
1061 mmc_release_host(host);
1062
1063 if (err) {
1064 mmc_sd_remove(host);
1065
1066 mmc_claim_host(host);
1067 mmc_detach_bus(host);
1068 mmc_power_off(host);
1069 mmc_release_host(host);
1070 }
1071 }
1072
1073 /*
1074 * Suspend callback from host.
1075 */
1076 static int mmc_sd_suspend(struct mmc_host *host)
1077 {
1078 BUG_ON(!host);
1079 BUG_ON(!host->card);
1080
1081 mmc_claim_host(host);
1082 if (!mmc_host_is_spi(host))
1083 mmc_deselect_cards(host);
1084 host->card->state &= ~MMC_STATE_HIGHSPEED;
1085 mmc_release_host(host);
1086
1087 return 0;
1088 }
1089
1090 /*
1091 * Resume callback from host.
1092 *
1093 * This function tries to determine if the same card is still present
1094 * and, if so, restore all state to it.
1095 */
1096 static int mmc_sd_resume(struct mmc_host *host)
1097 {
1098 int err;
1099
1100 BUG_ON(!host);
1101 BUG_ON(!host->card);
1102
1103 mmc_claim_host(host);
1104 err = mmc_sd_init_card(host, host->ocr, host->card);
1105 mmc_release_host(host);
1106
1107 return err;
1108 }
1109
1110 static int mmc_sd_power_restore(struct mmc_host *host)
1111 {
1112 int ret;
1113
1114 host->card->state &= ~MMC_STATE_HIGHSPEED;
1115 mmc_claim_host(host);
1116 ret = mmc_sd_init_card(host, host->ocr, host->card);
1117 mmc_release_host(host);
1118
1119 return ret;
1120 }
1121
1122 static const struct mmc_bus_ops mmc_sd_ops = {
1123 .remove = mmc_sd_remove,
1124 .detect = mmc_sd_detect,
1125 .suspend = NULL,
1126 .resume = NULL,
1127 .power_restore = mmc_sd_power_restore,
1128 .alive = mmc_sd_alive,
1129 };
1130
1131 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1132 .remove = mmc_sd_remove,
1133 .detect = mmc_sd_detect,
1134 .suspend = mmc_sd_suspend,
1135 .resume = mmc_sd_resume,
1136 .power_restore = mmc_sd_power_restore,
1137 .alive = mmc_sd_alive,
1138 };
1139
1140 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1141 {
1142 const struct mmc_bus_ops *bus_ops;
1143
1144 if (!mmc_card_is_removable(host))
1145 bus_ops = &mmc_sd_ops_unsafe;
1146 else
1147 bus_ops = &mmc_sd_ops;
1148 mmc_attach_bus(host, bus_ops);
1149 }
1150
1151 /*
1152 * Starting point for SD card init.
1153 */
1154 int mmc_attach_sd(struct mmc_host *host)
1155 {
1156 int err;
1157 u32 ocr;
1158
1159 BUG_ON(!host);
1160 WARN_ON(!host->claimed);
1161
1162 /* Disable preset value enable if already set since last time */
1163 if (host->ops->enable_preset_value) {
1164 mmc_host_clk_hold(host);
1165 host->ops->enable_preset_value(host, false);
1166 mmc_host_clk_release(host);
1167 }
1168
1169 err = mmc_send_app_op_cond(host, 0, &ocr);
1170 if (err)
1171 return err;
1172
1173 mmc_sd_attach_bus_ops(host);
1174 if (host->ocr_avail_sd)
1175 host->ocr_avail = host->ocr_avail_sd;
1176
1177 /*
1178 * We need to get OCR a different way for SPI.
1179 */
1180 if (mmc_host_is_spi(host)) {
1181 mmc_go_idle(host);
1182
1183 err = mmc_spi_read_ocr(host, 0, &ocr);
1184 if (err)
1185 goto err;
1186 }
1187
1188 /*
1189 * Sanity check the voltages that the card claims to
1190 * support.
1191 */
1192 if (ocr & 0x7F) {
1193 pr_warning("%s: card claims to support voltages "
1194 "below the defined range. These will be ignored.\n",
1195 mmc_hostname(host));
1196 ocr &= ~0x7F;
1197 }
1198
1199 if ((ocr & MMC_VDD_165_195) &&
1200 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1201 pr_warning("%s: SD card claims to support the "
1202 "incompletely defined 'low voltage range'. This "
1203 "will be ignored.\n", mmc_hostname(host));
1204 ocr &= ~MMC_VDD_165_195;
1205 }
1206
1207 host->ocr = mmc_select_voltage(host, ocr);
1208
1209 /*
1210 * Can we support the voltage(s) of the card(s)?
1211 */
1212 if (!host->ocr) {
1213 err = -EINVAL;
1214 goto err;
1215 }
1216
1217 /*
1218 * Detect and init the card.
1219 */
1220 err = mmc_sd_init_card(host, host->ocr, NULL);
1221 if (err)
1222 goto err;
1223
1224 mmc_release_host(host);
1225 err = mmc_add_card(host->card);
1226 mmc_claim_host(host);
1227 if (err)
1228 goto remove_card;
1229
1230 return 0;
1231
1232 remove_card:
1233 mmc_release_host(host);
1234 mmc_remove_card(host->card);
1235 host->card = NULL;
1236 mmc_claim_host(host);
1237 err:
1238 mmc_detach_bus(host);
1239
1240 pr_err("%s: error %d whilst initialising SD card\n",
1241 mmc_hostname(host), err);
1242
1243 return err;
1244 }
1245