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Merge tag 'iwlwifi-for-john-2014-10-23' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / drivers / mmc / core / sd.c
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/sizes.h>
15 #include <linux/slab.h>
16 #include <linux/stat.h>
17 #include <linux/pm_runtime.h>
18
19 #include <linux/mmc/host.h>
20 #include <linux/mmc/card.h>
21 #include <linux/mmc/mmc.h>
22 #include <linux/mmc/sd.h>
23
24 #include "core.h"
25 #include "bus.h"
26 #include "mmc_ops.h"
27 #include "sd.h"
28 #include "sd_ops.h"
29
30 static const unsigned int tran_exp[] = {
31 10000, 100000, 1000000, 10000000,
32 0, 0, 0, 0
33 };
34
35 static const unsigned char tran_mant[] = {
36 0, 10, 12, 13, 15, 20, 25, 30,
37 35, 40, 45, 50, 55, 60, 70, 80,
38 };
39
40 static const unsigned int tacc_exp[] = {
41 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
42 };
43
44 static const unsigned int tacc_mant[] = {
45 0, 10, 12, 13, 15, 20, 25, 30,
46 35, 40, 45, 50, 55, 60, 70, 80,
47 };
48
49 static const unsigned int sd_au_size[] = {
50 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
51 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
52 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
53 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
54 };
55
56 #define UNSTUFF_BITS(resp,start,size) \
57 ({ \
58 const int __size = size; \
59 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
60 const int __off = 3 - ((start) / 32); \
61 const int __shft = (start) & 31; \
62 u32 __res; \
63 \
64 __res = resp[__off] >> __shft; \
65 if (__size + __shft > 32) \
66 __res |= resp[__off-1] << ((32 - __shft) % 32); \
67 __res & __mask; \
68 })
69
70 /*
71 * Given the decoded CSD structure, decode the raw CID to our CID structure.
72 */
73 void mmc_decode_cid(struct mmc_card *card)
74 {
75 u32 *resp = card->raw_cid;
76
77 memset(&card->cid, 0, sizeof(struct mmc_cid));
78
79 /*
80 * SD doesn't currently have a version field so we will
81 * have to assume we can parse this.
82 */
83 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
84 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
85 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
86 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
87 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
88 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
89 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
90 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
91 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
92 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
93 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
94 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
95
96 card->cid.year += 2000; /* SD cards year offset */
97 }
98
99 /*
100 * Given a 128-bit response, decode to our card CSD structure.
101 */
102 static int mmc_decode_csd(struct mmc_card *card)
103 {
104 struct mmc_csd *csd = &card->csd;
105 unsigned int e, m, csd_struct;
106 u32 *resp = card->raw_csd;
107
108 csd_struct = UNSTUFF_BITS(resp, 126, 2);
109
110 switch (csd_struct) {
111 case 0:
112 m = UNSTUFF_BITS(resp, 115, 4);
113 e = UNSTUFF_BITS(resp, 112, 3);
114 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
115 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
116
117 m = UNSTUFF_BITS(resp, 99, 4);
118 e = UNSTUFF_BITS(resp, 96, 3);
119 csd->max_dtr = tran_exp[e] * tran_mant[m];
120 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
121
122 e = UNSTUFF_BITS(resp, 47, 3);
123 m = UNSTUFF_BITS(resp, 62, 12);
124 csd->capacity = (1 + m) << (e + 2);
125
126 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
127 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
128 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
129 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
130 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
131 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
132 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
133 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
134
135 if (UNSTUFF_BITS(resp, 46, 1)) {
136 csd->erase_size = 1;
137 } else if (csd->write_blkbits >= 9) {
138 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
139 csd->erase_size <<= csd->write_blkbits - 9;
140 }
141 break;
142 case 1:
143 /*
144 * This is a block-addressed SDHC or SDXC card. Most
145 * interesting fields are unused and have fixed
146 * values. To avoid getting tripped by buggy cards,
147 * we assume those fixed values ourselves.
148 */
149 mmc_card_set_blockaddr(card);
150
151 csd->tacc_ns = 0; /* Unused */
152 csd->tacc_clks = 0; /* Unused */
153
154 m = UNSTUFF_BITS(resp, 99, 4);
155 e = UNSTUFF_BITS(resp, 96, 3);
156 csd->max_dtr = tran_exp[e] * tran_mant[m];
157 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
158 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
159
160 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
161 if (csd->c_size >= 0xFFFF)
162 mmc_card_set_ext_capacity(card);
163
164 m = UNSTUFF_BITS(resp, 48, 22);
165 csd->capacity = (1 + m) << 10;
166
167 csd->read_blkbits = 9;
168 csd->read_partial = 0;
169 csd->write_misalign = 0;
170 csd->read_misalign = 0;
171 csd->r2w_factor = 4; /* Unused */
172 csd->write_blkbits = 9;
173 csd->write_partial = 0;
174 csd->erase_size = 1;
175 break;
176 default:
177 pr_err("%s: unrecognised CSD structure version %d\n",
178 mmc_hostname(card->host), csd_struct);
179 return -EINVAL;
180 }
181
182 card->erase_size = csd->erase_size;
183
184 return 0;
185 }
186
187 /*
188 * Given a 64-bit response, decode to our card SCR structure.
189 */
190 static int mmc_decode_scr(struct mmc_card *card)
191 {
192 struct sd_scr *scr = &card->scr;
193 unsigned int scr_struct;
194 u32 resp[4];
195
196 resp[3] = card->raw_scr[1];
197 resp[2] = card->raw_scr[0];
198
199 scr_struct = UNSTUFF_BITS(resp, 60, 4);
200 if (scr_struct != 0) {
201 pr_err("%s: unrecognised SCR structure version %d\n",
202 mmc_hostname(card->host), scr_struct);
203 return -EINVAL;
204 }
205
206 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
207 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
208 if (scr->sda_vsn == SCR_SPEC_VER_2)
209 /* Check if Physical Layer Spec v3.0 is supported */
210 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
211
212 if (UNSTUFF_BITS(resp, 55, 1))
213 card->erased_byte = 0xFF;
214 else
215 card->erased_byte = 0x0;
216
217 if (scr->sda_spec3)
218 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
219 return 0;
220 }
221
222 /*
223 * Fetch and process SD Status register.
224 */
225 static int mmc_read_ssr(struct mmc_card *card)
226 {
227 unsigned int au, es, et, eo;
228 int err, i;
229 u32 *ssr;
230
231 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
232 pr_warn("%s: card lacks mandatory SD Status function\n",
233 mmc_hostname(card->host));
234 return 0;
235 }
236
237 ssr = kmalloc(64, GFP_KERNEL);
238 if (!ssr)
239 return -ENOMEM;
240
241 err = mmc_app_sd_status(card, ssr);
242 if (err) {
243 pr_warn("%s: problem reading SD Status register\n",
244 mmc_hostname(card->host));
245 err = 0;
246 goto out;
247 }
248
249 for (i = 0; i < 16; i++)
250 ssr[i] = be32_to_cpu(ssr[i]);
251
252 /*
253 * UNSTUFF_BITS only works with four u32s so we have to offset the
254 * bitfield positions accordingly.
255 */
256 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
257 if (au) {
258 if (au <= 9 || card->scr.sda_spec3) {
259 card->ssr.au = sd_au_size[au];
260 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
261 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
262 if (es && et) {
263 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
264 card->ssr.erase_timeout = (et * 1000) / es;
265 card->ssr.erase_offset = eo * 1000;
266 }
267 } else {
268 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
269 mmc_hostname(card->host));
270 }
271 }
272 out:
273 kfree(ssr);
274 return err;
275 }
276
277 /*
278 * Fetches and decodes switch information
279 */
280 static int mmc_read_switch(struct mmc_card *card)
281 {
282 int err;
283 u8 *status;
284
285 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
286 return 0;
287
288 if (!(card->csd.cmdclass & CCC_SWITCH)) {
289 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
290 mmc_hostname(card->host));
291 return 0;
292 }
293
294 err = -EIO;
295
296 status = kmalloc(64, GFP_KERNEL);
297 if (!status) {
298 pr_err("%s: could not allocate a buffer for "
299 "switch capabilities.\n",
300 mmc_hostname(card->host));
301 return -ENOMEM;
302 }
303
304 /*
305 * Find out the card's support bits with a mode 0 operation.
306 * The argument does not matter, as the support bits do not
307 * change with the arguments.
308 */
309 err = mmc_sd_switch(card, 0, 0, 0, status);
310 if (err) {
311 /*
312 * If the host or the card can't do the switch,
313 * fail more gracefully.
314 */
315 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
316 goto out;
317
318 pr_warn("%s: problem reading Bus Speed modes\n",
319 mmc_hostname(card->host));
320 err = 0;
321
322 goto out;
323 }
324
325 if (status[13] & SD_MODE_HIGH_SPEED)
326 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
327
328 if (card->scr.sda_spec3) {
329 card->sw_caps.sd3_bus_mode = status[13];
330 /* Driver Strengths supported by the card */
331 card->sw_caps.sd3_drv_type = status[9];
332 }
333
334 out:
335 kfree(status);
336
337 return err;
338 }
339
340 /*
341 * Test if the card supports high-speed mode and, if so, switch to it.
342 */
343 int mmc_sd_switch_hs(struct mmc_card *card)
344 {
345 int err;
346 u8 *status;
347
348 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
349 return 0;
350
351 if (!(card->csd.cmdclass & CCC_SWITCH))
352 return 0;
353
354 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
355 return 0;
356
357 if (card->sw_caps.hs_max_dtr == 0)
358 return 0;
359
360 err = -EIO;
361
362 status = kmalloc(64, GFP_KERNEL);
363 if (!status) {
364 pr_err("%s: could not allocate a buffer for "
365 "switch capabilities.\n", mmc_hostname(card->host));
366 return -ENOMEM;
367 }
368
369 err = mmc_sd_switch(card, 1, 0, 1, status);
370 if (err)
371 goto out;
372
373 if ((status[16] & 0xF) != 1) {
374 pr_warn("%s: Problem switching card into high-speed mode!\n",
375 mmc_hostname(card->host));
376 err = 0;
377 } else {
378 err = 1;
379 }
380
381 out:
382 kfree(status);
383
384 return err;
385 }
386
387 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
388 {
389 int host_drv_type = SD_DRIVER_TYPE_B;
390 int card_drv_type = SD_DRIVER_TYPE_B;
391 int drive_strength;
392 int err;
393
394 /*
395 * If the host doesn't support any of the Driver Types A,C or D,
396 * or there is no board specific handler then default Driver
397 * Type B is used.
398 */
399 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
400 | MMC_CAP_DRIVER_TYPE_D)))
401 return 0;
402
403 if (!card->host->ops->select_drive_strength)
404 return 0;
405
406 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
407 host_drv_type |= SD_DRIVER_TYPE_A;
408
409 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
410 host_drv_type |= SD_DRIVER_TYPE_C;
411
412 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
413 host_drv_type |= SD_DRIVER_TYPE_D;
414
415 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
416 card_drv_type |= SD_DRIVER_TYPE_A;
417
418 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
419 card_drv_type |= SD_DRIVER_TYPE_C;
420
421 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
422 card_drv_type |= SD_DRIVER_TYPE_D;
423
424 /*
425 * The drive strength that the hardware can support
426 * depends on the board design. Pass the appropriate
427 * information and let the hardware specific code
428 * return what is possible given the options
429 */
430 mmc_host_clk_hold(card->host);
431 drive_strength = card->host->ops->select_drive_strength(
432 card->sw_caps.uhs_max_dtr,
433 host_drv_type, card_drv_type);
434 mmc_host_clk_release(card->host);
435
436 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
437 if (err)
438 return err;
439
440 if ((status[15] & 0xF) != drive_strength) {
441 pr_warn("%s: Problem setting drive strength!\n",
442 mmc_hostname(card->host));
443 return 0;
444 }
445
446 mmc_set_driver_type(card->host, drive_strength);
447
448 return 0;
449 }
450
451 static void sd_update_bus_speed_mode(struct mmc_card *card)
452 {
453 /*
454 * If the host doesn't support any of the UHS-I modes, fallback on
455 * default speed.
456 */
457 if (!mmc_host_uhs(card->host)) {
458 card->sd_bus_speed = 0;
459 return;
460 }
461
462 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
463 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
464 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
465 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
466 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
467 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
468 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
469 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
470 SD_MODE_UHS_SDR50)) {
471 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
472 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
473 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
474 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
475 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
476 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
477 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
478 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
479 SD_MODE_UHS_SDR12)) {
480 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
481 }
482 }
483
484 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
485 {
486 int err;
487 unsigned int timing = 0;
488
489 switch (card->sd_bus_speed) {
490 case UHS_SDR104_BUS_SPEED:
491 timing = MMC_TIMING_UHS_SDR104;
492 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
493 break;
494 case UHS_DDR50_BUS_SPEED:
495 timing = MMC_TIMING_UHS_DDR50;
496 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
497 break;
498 case UHS_SDR50_BUS_SPEED:
499 timing = MMC_TIMING_UHS_SDR50;
500 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
501 break;
502 case UHS_SDR25_BUS_SPEED:
503 timing = MMC_TIMING_UHS_SDR25;
504 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
505 break;
506 case UHS_SDR12_BUS_SPEED:
507 timing = MMC_TIMING_UHS_SDR12;
508 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
509 break;
510 default:
511 return 0;
512 }
513
514 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
515 if (err)
516 return err;
517
518 if ((status[16] & 0xF) != card->sd_bus_speed)
519 pr_warn("%s: Problem setting bus speed mode!\n",
520 mmc_hostname(card->host));
521 else {
522 mmc_set_timing(card->host, timing);
523 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
524 }
525
526 return 0;
527 }
528
529 /* Get host's max current setting at its current voltage */
530 static u32 sd_get_host_max_current(struct mmc_host *host)
531 {
532 u32 voltage, max_current;
533
534 voltage = 1 << host->ios.vdd;
535 switch (voltage) {
536 case MMC_VDD_165_195:
537 max_current = host->max_current_180;
538 break;
539 case MMC_VDD_29_30:
540 case MMC_VDD_30_31:
541 max_current = host->max_current_300;
542 break;
543 case MMC_VDD_32_33:
544 case MMC_VDD_33_34:
545 max_current = host->max_current_330;
546 break;
547 default:
548 max_current = 0;
549 }
550
551 return max_current;
552 }
553
554 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
555 {
556 int current_limit = SD_SET_CURRENT_NO_CHANGE;
557 int err;
558 u32 max_current;
559
560 /*
561 * Current limit switch is only defined for SDR50, SDR104, and DDR50
562 * bus speed modes. For other bus speed modes, we do not change the
563 * current limit.
564 */
565 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
566 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
567 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
568 return 0;
569
570 /*
571 * Host has different current capabilities when operating at
572 * different voltages, so find out its max current first.
573 */
574 max_current = sd_get_host_max_current(card->host);
575
576 /*
577 * We only check host's capability here, if we set a limit that is
578 * higher than the card's maximum current, the card will be using its
579 * maximum current, e.g. if the card's maximum current is 300ma, and
580 * when we set current limit to 200ma, the card will draw 200ma, and
581 * when we set current limit to 400/600/800ma, the card will draw its
582 * maximum 300ma from the host.
583 */
584 if (max_current >= 800)
585 current_limit = SD_SET_CURRENT_LIMIT_800;
586 else if (max_current >= 600)
587 current_limit = SD_SET_CURRENT_LIMIT_600;
588 else if (max_current >= 400)
589 current_limit = SD_SET_CURRENT_LIMIT_400;
590 else if (max_current >= 200)
591 current_limit = SD_SET_CURRENT_LIMIT_200;
592
593 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
594 err = mmc_sd_switch(card, 1, 3, current_limit, status);
595 if (err)
596 return err;
597
598 if (((status[15] >> 4) & 0x0F) != current_limit)
599 pr_warn("%s: Problem setting current limit!\n",
600 mmc_hostname(card->host));
601
602 }
603
604 return 0;
605 }
606
607 /*
608 * UHS-I specific initialization procedure
609 */
610 static int mmc_sd_init_uhs_card(struct mmc_card *card)
611 {
612 int err;
613 u8 *status;
614
615 if (!card->scr.sda_spec3)
616 return 0;
617
618 if (!(card->csd.cmdclass & CCC_SWITCH))
619 return 0;
620
621 status = kmalloc(64, GFP_KERNEL);
622 if (!status) {
623 pr_err("%s: could not allocate a buffer for "
624 "switch capabilities.\n", mmc_hostname(card->host));
625 return -ENOMEM;
626 }
627
628 /* Set 4-bit bus width */
629 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
630 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
631 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
632 if (err)
633 goto out;
634
635 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
636 }
637
638 /*
639 * Select the bus speed mode depending on host
640 * and card capability.
641 */
642 sd_update_bus_speed_mode(card);
643
644 /* Set the driver strength for the card */
645 err = sd_select_driver_type(card, status);
646 if (err)
647 goto out;
648
649 /* Set current limit for the card */
650 err = sd_set_current_limit(card, status);
651 if (err)
652 goto out;
653
654 /* Set bus speed mode of the card */
655 err = sd_set_bus_speed_mode(card, status);
656 if (err)
657 goto out;
658
659 /*
660 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
661 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
662 */
663 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning &&
664 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED ||
665 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) {
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 ATTRIBUTE_GROUPS(sd_std);
710
711 struct device_type sd_type = {
712 .groups = sd_std_groups,
713 };
714
715 /*
716 * Fetch CID from card.
717 */
718 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
719 {
720 int err;
721 u32 max_current;
722 int retries = 10;
723 u32 pocr = ocr;
724
725 try_again:
726 if (!retries) {
727 ocr &= ~SD_OCR_S18R;
728 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
729 }
730
731 /*
732 * Since we're changing the OCR value, we seem to
733 * need to tell some cards to go back to the idle
734 * state. We wait 1ms to give cards time to
735 * respond.
736 */
737 mmc_go_idle(host);
738
739 /*
740 * If SD_SEND_IF_COND indicates an SD 2.0
741 * compliant card and we should set bit 30
742 * of the ocr to indicate that we can handle
743 * block-addressed SDHC cards.
744 */
745 err = mmc_send_if_cond(host, ocr);
746 if (!err)
747 ocr |= SD_OCR_CCS;
748
749 /*
750 * If the host supports one of UHS-I modes, request the card
751 * to switch to 1.8V signaling level. If the card has failed
752 * repeatedly to switch however, skip this.
753 */
754 if (retries && mmc_host_uhs(host))
755 ocr |= SD_OCR_S18R;
756
757 /*
758 * If the host can supply more than 150mA at current voltage,
759 * XPC should be set to 1.
760 */
761 max_current = sd_get_host_max_current(host);
762 if (max_current > 150)
763 ocr |= SD_OCR_XPC;
764
765 err = mmc_send_app_op_cond(host, ocr, rocr);
766 if (err)
767 return err;
768
769 /*
770 * In case CCS and S18A in the response is set, start Signal Voltage
771 * Switch procedure. SPI mode doesn't support CMD11.
772 */
773 if (!mmc_host_is_spi(host) && rocr &&
774 ((*rocr & 0x41000000) == 0x41000000)) {
775 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
776 pocr);
777 if (err == -EAGAIN) {
778 retries--;
779 goto try_again;
780 } else if (err) {
781 retries = 0;
782 goto try_again;
783 }
784 }
785
786 if (mmc_host_is_spi(host))
787 err = mmc_send_cid(host, cid);
788 else
789 err = mmc_all_send_cid(host, cid);
790
791 return err;
792 }
793
794 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
795 {
796 int err;
797
798 /*
799 * Fetch CSD from card.
800 */
801 err = mmc_send_csd(card, card->raw_csd);
802 if (err)
803 return err;
804
805 err = mmc_decode_csd(card);
806 if (err)
807 return err;
808
809 return 0;
810 }
811
812 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
813 bool reinit)
814 {
815 int err;
816
817 if (!reinit) {
818 /*
819 * Fetch SCR from card.
820 */
821 err = mmc_app_send_scr(card, card->raw_scr);
822 if (err)
823 return err;
824
825 err = mmc_decode_scr(card);
826 if (err)
827 return err;
828
829 /*
830 * Fetch and process SD Status register.
831 */
832 err = mmc_read_ssr(card);
833 if (err)
834 return err;
835
836 /* Erase init depends on CSD and SSR */
837 mmc_init_erase(card);
838
839 /*
840 * Fetch switch information from card.
841 */
842 err = mmc_read_switch(card);
843 if (err)
844 return err;
845 }
846
847 /*
848 * For SPI, enable CRC as appropriate.
849 * This CRC enable is located AFTER the reading of the
850 * card registers because some SDHC cards are not able
851 * to provide valid CRCs for non-512-byte blocks.
852 */
853 if (mmc_host_is_spi(host)) {
854 err = mmc_spi_set_crc(host, use_spi_crc);
855 if (err)
856 return err;
857 }
858
859 /*
860 * Check if read-only switch is active.
861 */
862 if (!reinit) {
863 int ro = -1;
864
865 if (host->ops->get_ro) {
866 mmc_host_clk_hold(card->host);
867 ro = host->ops->get_ro(host);
868 mmc_host_clk_release(card->host);
869 }
870
871 if (ro < 0) {
872 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
873 mmc_hostname(host));
874 } else if (ro > 0) {
875 mmc_card_set_readonly(card);
876 }
877 }
878
879 return 0;
880 }
881
882 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
883 {
884 unsigned max_dtr = (unsigned int)-1;
885
886 if (mmc_card_hs(card)) {
887 if (max_dtr > card->sw_caps.hs_max_dtr)
888 max_dtr = card->sw_caps.hs_max_dtr;
889 } else if (max_dtr > card->csd.max_dtr) {
890 max_dtr = card->csd.max_dtr;
891 }
892
893 return max_dtr;
894 }
895
896 /*
897 * Handle the detection and initialisation of a card.
898 *
899 * In the case of a resume, "oldcard" will contain the card
900 * we're trying to reinitialise.
901 */
902 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
903 struct mmc_card *oldcard)
904 {
905 struct mmc_card *card;
906 int err;
907 u32 cid[4];
908 u32 rocr = 0;
909
910 BUG_ON(!host);
911 WARN_ON(!host->claimed);
912
913 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
914 if (err)
915 return err;
916
917 if (oldcard) {
918 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
919 return -ENOENT;
920
921 card = oldcard;
922 } else {
923 /*
924 * Allocate card structure.
925 */
926 card = mmc_alloc_card(host, &sd_type);
927 if (IS_ERR(card))
928 return PTR_ERR(card);
929
930 card->ocr = ocr;
931 card->type = MMC_TYPE_SD;
932 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
933 }
934
935 /*
936 * For native busses: get card RCA and quit open drain mode.
937 */
938 if (!mmc_host_is_spi(host)) {
939 err = mmc_send_relative_addr(host, &card->rca);
940 if (err)
941 goto free_card;
942 }
943
944 if (!oldcard) {
945 err = mmc_sd_get_csd(host, card);
946 if (err)
947 goto free_card;
948
949 mmc_decode_cid(card);
950 }
951
952 /*
953 * handling only for cards supporting DSR and hosts requesting
954 * DSR configuration
955 */
956 if (card->csd.dsr_imp && host->dsr_req)
957 mmc_set_dsr(host);
958
959 /*
960 * Select card, as all following commands rely on that.
961 */
962 if (!mmc_host_is_spi(host)) {
963 err = mmc_select_card(card);
964 if (err)
965 goto free_card;
966 }
967
968 err = mmc_sd_setup_card(host, card, oldcard != NULL);
969 if (err)
970 goto free_card;
971
972 /* Initialization sequence for UHS-I cards */
973 if (rocr & SD_ROCR_S18A) {
974 err = mmc_sd_init_uhs_card(card);
975 if (err)
976 goto free_card;
977 } else {
978 /*
979 * Attempt to change to high-speed (if supported)
980 */
981 err = mmc_sd_switch_hs(card);
982 if (err > 0)
983 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
984 else if (err)
985 goto free_card;
986
987 /*
988 * Set bus speed.
989 */
990 mmc_set_clock(host, mmc_sd_get_max_clock(card));
991
992 /*
993 * Switch to wider bus (if supported).
994 */
995 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
996 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
997 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
998 if (err)
999 goto free_card;
1000
1001 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1002 }
1003 }
1004
1005 host->card = card;
1006 return 0;
1007
1008 free_card:
1009 if (!oldcard)
1010 mmc_remove_card(card);
1011
1012 return err;
1013 }
1014
1015 /*
1016 * Host is being removed. Free up the current card.
1017 */
1018 static void mmc_sd_remove(struct mmc_host *host)
1019 {
1020 BUG_ON(!host);
1021 BUG_ON(!host->card);
1022
1023 mmc_remove_card(host->card);
1024 host->card = NULL;
1025 }
1026
1027 /*
1028 * Card detection - card is alive.
1029 */
1030 static int mmc_sd_alive(struct mmc_host *host)
1031 {
1032 return mmc_send_status(host->card, NULL);
1033 }
1034
1035 /*
1036 * Card detection callback from host.
1037 */
1038 static void mmc_sd_detect(struct mmc_host *host)
1039 {
1040 int err;
1041
1042 BUG_ON(!host);
1043 BUG_ON(!host->card);
1044
1045 mmc_get_card(host->card);
1046
1047 /*
1048 * Just check if our card has been removed.
1049 */
1050 err = _mmc_detect_card_removed(host);
1051
1052 mmc_put_card(host->card);
1053
1054 if (err) {
1055 mmc_sd_remove(host);
1056
1057 mmc_claim_host(host);
1058 mmc_detach_bus(host);
1059 mmc_power_off(host);
1060 mmc_release_host(host);
1061 }
1062 }
1063
1064 static int _mmc_sd_suspend(struct mmc_host *host)
1065 {
1066 int err = 0;
1067
1068 BUG_ON(!host);
1069 BUG_ON(!host->card);
1070
1071 mmc_claim_host(host);
1072
1073 if (mmc_card_suspended(host->card))
1074 goto out;
1075
1076 if (!mmc_host_is_spi(host))
1077 err = mmc_deselect_cards(host);
1078
1079 if (!err) {
1080 mmc_power_off(host);
1081 mmc_card_set_suspended(host->card);
1082 }
1083
1084 out:
1085 mmc_release_host(host);
1086 return err;
1087 }
1088
1089 /*
1090 * Callback for suspend
1091 */
1092 static int mmc_sd_suspend(struct mmc_host *host)
1093 {
1094 int err;
1095
1096 err = _mmc_sd_suspend(host);
1097 if (!err) {
1098 pm_runtime_disable(&host->card->dev);
1099 pm_runtime_set_suspended(&host->card->dev);
1100 }
1101
1102 return err;
1103 }
1104
1105 /*
1106 * This function tries to determine if the same card is still present
1107 * and, if so, restore all state to it.
1108 */
1109 static int _mmc_sd_resume(struct mmc_host *host)
1110 {
1111 int err = 0;
1112
1113 BUG_ON(!host);
1114 BUG_ON(!host->card);
1115
1116 mmc_claim_host(host);
1117
1118 if (!mmc_card_suspended(host->card))
1119 goto out;
1120
1121 mmc_power_up(host, host->card->ocr);
1122 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1123 mmc_card_clr_suspended(host->card);
1124
1125 out:
1126 mmc_release_host(host);
1127 return err;
1128 }
1129
1130 /*
1131 * Callback for resume
1132 */
1133 static int mmc_sd_resume(struct mmc_host *host)
1134 {
1135 int err = 0;
1136
1137 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1138 err = _mmc_sd_resume(host);
1139 pm_runtime_set_active(&host->card->dev);
1140 pm_runtime_mark_last_busy(&host->card->dev);
1141 }
1142 pm_runtime_enable(&host->card->dev);
1143
1144 return err;
1145 }
1146
1147 /*
1148 * Callback for runtime_suspend.
1149 */
1150 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1151 {
1152 int err;
1153
1154 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1155 return 0;
1156
1157 err = _mmc_sd_suspend(host);
1158 if (err)
1159 pr_err("%s: error %d doing aggessive suspend\n",
1160 mmc_hostname(host), err);
1161
1162 return err;
1163 }
1164
1165 /*
1166 * Callback for runtime_resume.
1167 */
1168 static int mmc_sd_runtime_resume(struct mmc_host *host)
1169 {
1170 int err;
1171
1172 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1173 return 0;
1174
1175 err = _mmc_sd_resume(host);
1176 if (err)
1177 pr_err("%s: error %d doing aggessive resume\n",
1178 mmc_hostname(host), err);
1179
1180 return 0;
1181 }
1182
1183 static int mmc_sd_power_restore(struct mmc_host *host)
1184 {
1185 int ret;
1186
1187 mmc_claim_host(host);
1188 ret = mmc_sd_init_card(host, host->card->ocr, host->card);
1189 mmc_release_host(host);
1190
1191 return ret;
1192 }
1193
1194 static const struct mmc_bus_ops mmc_sd_ops = {
1195 .remove = mmc_sd_remove,
1196 .detect = mmc_sd_detect,
1197 .runtime_suspend = mmc_sd_runtime_suspend,
1198 .runtime_resume = mmc_sd_runtime_resume,
1199 .suspend = mmc_sd_suspend,
1200 .resume = mmc_sd_resume,
1201 .power_restore = mmc_sd_power_restore,
1202 .alive = mmc_sd_alive,
1203 .shutdown = mmc_sd_suspend,
1204 };
1205
1206 /*
1207 * Starting point for SD card init.
1208 */
1209 int mmc_attach_sd(struct mmc_host *host)
1210 {
1211 int err;
1212 u32 ocr, rocr;
1213
1214 BUG_ON(!host);
1215 WARN_ON(!host->claimed);
1216
1217 err = mmc_send_app_op_cond(host, 0, &ocr);
1218 if (err)
1219 return err;
1220
1221 mmc_attach_bus(host, &mmc_sd_ops);
1222 if (host->ocr_avail_sd)
1223 host->ocr_avail = host->ocr_avail_sd;
1224
1225 /*
1226 * We need to get OCR a different way for SPI.
1227 */
1228 if (mmc_host_is_spi(host)) {
1229 mmc_go_idle(host);
1230
1231 err = mmc_spi_read_ocr(host, 0, &ocr);
1232 if (err)
1233 goto err;
1234 }
1235
1236 rocr = mmc_select_voltage(host, ocr);
1237
1238 /*
1239 * Can we support the voltage(s) of the card(s)?
1240 */
1241 if (!rocr) {
1242 err = -EINVAL;
1243 goto err;
1244 }
1245
1246 /*
1247 * Detect and init the card.
1248 */
1249 err = mmc_sd_init_card(host, rocr, NULL);
1250 if (err)
1251 goto err;
1252
1253 mmc_release_host(host);
1254 err = mmc_add_card(host->card);
1255 mmc_claim_host(host);
1256 if (err)
1257 goto remove_card;
1258
1259 return 0;
1260
1261 remove_card:
1262 mmc_release_host(host);
1263 mmc_remove_card(host->card);
1264 host->card = NULL;
1265 mmc_claim_host(host);
1266 err:
1267 mmc_detach_bus(host);
1268
1269 pr_err("%s: error %d whilst initialising SD card\n",
1270 mmc_hostname(host), err);
1271
1272 return err;
1273 }
1274
Linux kernel - Deliverables
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