1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/mmc/core/sd.c
4 *
5 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
6 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
7 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
8 */
9
10 #include <linux/err.h>
11 #include <linux/sizes.h>
12 #include <linux/slab.h>
13 #include <linux/stat.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/random.h>
16 #include <linux/scatterlist.h>
17 #include <linux/sysfs.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 "card.h"
26 #include "host.h"
27 #include "bus.h"
28 #include "mmc_ops.h"
29 #include "quirks.h"
30 #include "sd.h"
31 #include "sd_ops.h"
32
33 static const unsigned int tran_exp[] = {
34 10000, 100000, 1000000, 10000000,
35 0, 0, 0, 0
36 };
37
38 static const unsigned char tran_mant[] = {
39 0, 10, 12, 13, 15, 20, 25, 30,
40 35, 40, 45, 50, 55, 60, 70, 80,
41 };
42
43 static const unsigned int taac_exp[] = {
44 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
45 };
46
47 static const unsigned int taac_mant[] = {
48 0, 10, 12, 13, 15, 20, 25, 30,
49 35, 40, 45, 50, 55, 60, 70, 80,
50 };
51
52 static const unsigned int sd_au_size[] = {
53 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
54 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
55 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
56 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
57 };
58
59 #define SD_POWEROFF_NOTIFY_TIMEOUT_MS 1000
60 #define SD_WRITE_EXTR_SINGLE_TIMEOUT_MS 1000
61
62 struct sd_busy_data {
63 struct mmc_card *card;
64 u8 *reg_buf;
65 };
66
67 /*
68 * Given the decoded CSD structure, decode the raw CID to our CID structure.
69 */
mmc_decode_cid(struct mmc_card * card)70 void mmc_decode_cid(struct mmc_card *card)
71 {
72 u32 *resp = card->raw_cid;
73
74 /*
75 * Add the raw card ID (cid) data to the entropy pool. It doesn't
76 * matter that not all of it is unique, it's just bonus entropy.
77 */
78 add_device_randomness(&card->raw_cid, sizeof(card->raw_cid));
79
80 /*
81 * SD doesn't currently have a version field so we will
82 * have to assume we can parse this.
83 */
84 card->cid.manfid = unstuff_bits(resp, 120, 8);
85 card->cid.oemid = unstuff_bits(resp, 104, 16);
86 card->cid.prod_name[0] = unstuff_bits(resp, 96, 8);
87 card->cid.prod_name[1] = unstuff_bits(resp, 88, 8);
88 card->cid.prod_name[2] = unstuff_bits(resp, 80, 8);
89 card->cid.prod_name[3] = unstuff_bits(resp, 72, 8);
90 card->cid.prod_name[4] = unstuff_bits(resp, 64, 8);
91 card->cid.hwrev = unstuff_bits(resp, 60, 4);
92 card->cid.fwrev = unstuff_bits(resp, 56, 4);
93 card->cid.serial = unstuff_bits(resp, 24, 32);
94 card->cid.year = unstuff_bits(resp, 12, 8);
95 card->cid.month = unstuff_bits(resp, 8, 4);
96
97 card->cid.year += 2000; /* SD cards year offset */
98 }
99
100 /*
101 * Given a 128-bit response, decode to our card CSD structure.
102 */
mmc_decode_csd(struct mmc_card * card,bool is_sduc)103 static int mmc_decode_csd(struct mmc_card *card, bool is_sduc)
104 {
105 struct mmc_csd *csd = &card->csd;
106 unsigned int e, m, csd_struct;
107 u32 *resp = card->raw_csd;
108
109 csd_struct = unstuff_bits(resp, 126, 2);
110
111 switch (csd_struct) {
112 case 0:
113 m = unstuff_bits(resp, 115, 4);
114 e = unstuff_bits(resp, 112, 3);
115 csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10;
116 csd->taac_clks = unstuff_bits(resp, 104, 8) * 100;
117
118 m = unstuff_bits(resp, 99, 4);
119 e = unstuff_bits(resp, 96, 3);
120 csd->max_dtr = tran_exp[e] * tran_mant[m];
121 csd->cmdclass = unstuff_bits(resp, 84, 12);
122
123 e = unstuff_bits(resp, 47, 3);
124 m = unstuff_bits(resp, 62, 12);
125 csd->capacity = (1 + m) << (e + 2);
126
127 csd->read_blkbits = unstuff_bits(resp, 80, 4);
128 csd->read_partial = unstuff_bits(resp, 79, 1);
129 csd->write_misalign = unstuff_bits(resp, 78, 1);
130 csd->read_misalign = unstuff_bits(resp, 77, 1);
131 csd->dsr_imp = unstuff_bits(resp, 76, 1);
132 csd->r2w_factor = unstuff_bits(resp, 26, 3);
133 csd->write_blkbits = unstuff_bits(resp, 22, 4);
134 csd->write_partial = unstuff_bits(resp, 21, 1);
135
136 if (unstuff_bits(resp, 46, 1)) {
137 csd->erase_size = 1;
138 } else if (csd->write_blkbits >= 9) {
139 csd->erase_size = unstuff_bits(resp, 39, 7) + 1;
140 csd->erase_size <<= csd->write_blkbits - 9;
141 }
142
143 if (unstuff_bits(resp, 13, 1))
144 mmc_card_set_readonly(card);
145 break;
146 case 1:
147 case 2:
148 /*
149 * This is a block-addressed SDHC, SDXC or SDUC card.
150 * Most interesting fields are unused and have fixed
151 * values. To avoid getting tripped by buggy cards,
152 * we assume those fixed values ourselves.
153 */
154 mmc_card_set_blockaddr(card);
155
156 csd->taac_ns = 0; /* Unused */
157 csd->taac_clks = 0; /* Unused */
158
159 m = unstuff_bits(resp, 99, 4);
160 e = unstuff_bits(resp, 96, 3);
161 csd->max_dtr = tran_exp[e] * tran_mant[m];
162 csd->cmdclass = unstuff_bits(resp, 84, 12);
163
164 if (csd_struct == 1)
165 m = unstuff_bits(resp, 48, 22);
166 else
167 m = unstuff_bits(resp, 48, 28);
168 csd->c_size = m;
169
170 if (csd->c_size >= 0x400000 && is_sduc)
171 mmc_card_set_ult_capacity(card);
172 else if (csd->c_size >= 0xFFFF)
173 mmc_card_set_ext_capacity(card);
174
175 csd->capacity = (1 + (typeof(sector_t))m) << 10;
176
177 csd->read_blkbits = 9;
178 csd->read_partial = 0;
179 csd->write_misalign = 0;
180 csd->read_misalign = 0;
181 csd->r2w_factor = 4; /* Unused */
182 csd->write_blkbits = 9;
183 csd->write_partial = 0;
184 csd->erase_size = 1;
185
186 if (unstuff_bits(resp, 13, 1))
187 mmc_card_set_readonly(card);
188 break;
189 default:
190 pr_err("%s: unrecognised CSD structure version %d\n",
191 mmc_hostname(card->host), csd_struct);
192 return -EINVAL;
193 }
194
195 card->erase_size = csd->erase_size;
196
197 return 0;
198 }
199
200 /*
201 * Given a 64-bit response, decode to our card SCR structure.
202 */
mmc_decode_scr(struct mmc_card * card)203 static int mmc_decode_scr(struct mmc_card *card)
204 {
205 struct sd_scr *scr = &card->scr;
206 unsigned int scr_struct;
207 u32 resp[4];
208
209 resp[3] = card->raw_scr[1];
210 resp[2] = card->raw_scr[0];
211
212 scr_struct = unstuff_bits(resp, 60, 4);
213 if (scr_struct != 0) {
214 pr_err("%s: unrecognised SCR structure version %d\n",
215 mmc_hostname(card->host), scr_struct);
216 return -EINVAL;
217 }
218
219 scr->sda_vsn = unstuff_bits(resp, 56, 4);
220 scr->bus_widths = unstuff_bits(resp, 48, 4);
221 if (scr->sda_vsn == SCR_SPEC_VER_2)
222 /* Check if Physical Layer Spec v3.0 is supported */
223 scr->sda_spec3 = unstuff_bits(resp, 47, 1);
224
225 if (scr->sda_spec3) {
226 scr->sda_spec4 = unstuff_bits(resp, 42, 1);
227 scr->sda_specx = unstuff_bits(resp, 38, 4);
228 }
229
230 if (unstuff_bits(resp, 55, 1))
231 card->erased_byte = 0xFF;
232 else
233 card->erased_byte = 0x0;
234
235 if (scr->sda_spec4)
236 scr->cmds = unstuff_bits(resp, 32, 4);
237 else if (scr->sda_spec3)
238 scr->cmds = unstuff_bits(resp, 32, 2);
239
240 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */
241 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
242 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
243 pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
244 return -EINVAL;
245 }
246
247 return 0;
248 }
249
250 /*
251 * Fetch and process SD Status register.
252 */
mmc_read_ssr(struct mmc_card * card)253 static int mmc_read_ssr(struct mmc_card *card)
254 {
255 unsigned int au, es, et, eo;
256 __be32 *raw_ssr;
257 u32 resp[4] = {};
258 u8 discard_support;
259 int i;
260
261 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
262 pr_warn("%s: card lacks mandatory SD Status function\n",
263 mmc_hostname(card->host));
264 return 0;
265 }
266
267 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
268 if (!raw_ssr)
269 return -ENOMEM;
270
271 if (mmc_app_sd_status(card, raw_ssr)) {
272 pr_warn("%s: problem reading SD Status register\n",
273 mmc_hostname(card->host));
274 kfree(raw_ssr);
275 return 0;
276 }
277
278 for (i = 0; i < 16; i++)
279 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
280
281 kfree(raw_ssr);
282
283 /*
284 * unstuff_bits only works with four u32s so we have to offset the
285 * bitfield positions accordingly.
286 */
287 au = unstuff_bits(card->raw_ssr, 428 - 384, 4);
288 if (au) {
289 if (au <= 9 || card->scr.sda_spec3) {
290 card->ssr.au = sd_au_size[au];
291 es = unstuff_bits(card->raw_ssr, 408 - 384, 16);
292 et = unstuff_bits(card->raw_ssr, 402 - 384, 6);
293 if (es && et) {
294 eo = unstuff_bits(card->raw_ssr, 400 - 384, 2);
295 card->ssr.erase_timeout = (et * 1000) / es;
296 card->ssr.erase_offset = eo * 1000;
297 }
298 } else {
299 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
300 mmc_hostname(card->host));
301 }
302 }
303
304 /*
305 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set
306 */
307 resp[3] = card->raw_ssr[6];
308 discard_support = unstuff_bits(resp, 313 - 288, 1);
309 card->erase_arg = (card->scr.sda_specx && discard_support) ?
310 SD_DISCARD_ARG : SD_ERASE_ARG;
311
312 return 0;
313 }
314
315 /*
316 * Fetches and decodes switch information
317 */
mmc_read_switch(struct mmc_card * card)318 static int mmc_read_switch(struct mmc_card *card)
319 {
320 int err;
321 u8 *status;
322
323 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
324 return 0;
325
326 if (!(card->csd.cmdclass & CCC_SWITCH)) {
327 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
328 mmc_hostname(card->host));
329 return 0;
330 }
331
332 status = kmalloc(64, GFP_KERNEL);
333 if (!status)
334 return -ENOMEM;
335
336 /*
337 * Find out the card's support bits with a mode 0 operation.
338 * The argument does not matter, as the support bits do not
339 * change with the arguments.
340 */
341 err = mmc_sd_switch(card, SD_SWITCH_CHECK, 0, 0, status);
342 if (err) {
343 /*
344 * If the host or the card can't do the switch,
345 * fail more gracefully.
346 */
347 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
348 goto out;
349
350 pr_warn("%s: problem reading Bus Speed modes\n",
351 mmc_hostname(card->host));
352 err = 0;
353
354 goto out;
355 }
356
357 if (status[13] & SD_MODE_HIGH_SPEED)
358 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
359
360 if (card->scr.sda_spec3) {
361 card->sw_caps.sd3_bus_mode = status[13];
362 /* Driver Strengths supported by the card */
363 card->sw_caps.sd3_drv_type = status[9];
364 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
365 }
366
367 out:
368 kfree(status);
369
370 return err;
371 }
372
373 /*
374 * Test if the card supports high-speed mode and, if so, switch to it.
375 */
mmc_sd_switch_hs(struct mmc_card * card)376 int mmc_sd_switch_hs(struct mmc_card *card)
377 {
378 int err;
379 u8 *status;
380
381 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
382 return 0;
383
384 if (!(card->csd.cmdclass & CCC_SWITCH))
385 return 0;
386
387 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
388 return 0;
389
390 if (card->sw_caps.hs_max_dtr == 0)
391 return 0;
392
393 status = kmalloc(64, GFP_KERNEL);
394 if (!status)
395 return -ENOMEM;
396
397 err = mmc_sd_switch(card, SD_SWITCH_SET, 0,
398 HIGH_SPEED_BUS_SPEED, status);
399 if (err)
400 goto out;
401
402 if ((status[16] & 0xF) != HIGH_SPEED_BUS_SPEED) {
403 pr_warn("%s: Problem switching card into high-speed mode!\n",
404 mmc_hostname(card->host));
405 err = 0;
406 } else {
407 err = 1;
408 }
409
410 out:
411 kfree(status);
412
413 return err;
414 }
415
sd_select_driver_type(struct mmc_card * card,u8 * status)416 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
417 {
418 int card_drv_type, drive_strength, drv_type;
419 int err;
420
421 card->drive_strength = 0;
422
423 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
424
425 drive_strength = mmc_select_drive_strength(card,
426 card->sw_caps.uhs_max_dtr,
427 card_drv_type, &drv_type);
428
429 if (drive_strength) {
430 err = mmc_sd_switch(card, SD_SWITCH_SET, 2,
431 drive_strength, status);
432 if (err)
433 return err;
434 if ((status[15] & 0xF) != drive_strength) {
435 pr_warn("%s: Problem setting drive strength!\n",
436 mmc_hostname(card->host));
437 return 0;
438 }
439 card->drive_strength = drive_strength;
440 }
441
442 if (drv_type)
443 mmc_set_driver_type(card->host, drv_type);
444
445 return 0;
446 }
447
sd_update_bus_speed_mode(struct mmc_card * card)448 static void sd_update_bus_speed_mode(struct mmc_card *card)
449 {
450 /*
451 * If the host doesn't support any of the UHS-I modes, fallback on
452 * default speed.
453 */
454 if (!mmc_host_uhs(card->host)) {
455 card->sd_bus_speed = 0;
456 return;
457 }
458
459 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
460 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
461 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
462 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
463 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
464 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
465 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
466 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
467 SD_MODE_UHS_SDR50)) {
468 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
469 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
470 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
471 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
472 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
473 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
474 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
475 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
476 SD_MODE_UHS_SDR12)) {
477 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
478 }
479 }
480
sd_set_bus_speed_mode(struct mmc_card * card,u8 * status)481 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
482 {
483 int err;
484 unsigned int timing = 0;
485
486 switch (card->sd_bus_speed) {
487 case UHS_SDR104_BUS_SPEED:
488 timing = MMC_TIMING_UHS_SDR104;
489 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
490 break;
491 case UHS_DDR50_BUS_SPEED:
492 timing = MMC_TIMING_UHS_DDR50;
493 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
494 break;
495 case UHS_SDR50_BUS_SPEED:
496 timing = MMC_TIMING_UHS_SDR50;
497 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
498 break;
499 case UHS_SDR25_BUS_SPEED:
500 timing = MMC_TIMING_UHS_SDR25;
501 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
502 break;
503 case UHS_SDR12_BUS_SPEED:
504 timing = MMC_TIMING_UHS_SDR12;
505 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
506 break;
507 default:
508 return 0;
509 }
510
511 err = mmc_sd_switch(card, SD_SWITCH_SET, 0, card->sd_bus_speed, status);
512 if (err)
513 return err;
514
515 if ((status[16] & 0xF) != card->sd_bus_speed)
516 pr_warn("%s: Problem setting bus speed mode!\n",
517 mmc_hostname(card->host));
518 else {
519 mmc_set_timing(card->host, timing);
520 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
521 }
522
523 return 0;
524 }
525
526 /* Get host's max current setting at its current voltage */
sd_get_host_max_current(struct mmc_host * host)527 static u32 sd_get_host_max_current(struct mmc_host *host)
528 {
529 u32 voltage, max_current;
530
531 voltage = 1 << host->ios.vdd;
532 switch (voltage) {
533 case MMC_VDD_165_195:
534 max_current = host->max_current_180;
535 break;
536 case MMC_VDD_29_30:
537 case MMC_VDD_30_31:
538 max_current = host->max_current_300;
539 break;
540 case MMC_VDD_32_33:
541 case MMC_VDD_33_34:
542 max_current = host->max_current_330;
543 break;
544 default:
545 max_current = 0;
546 }
547
548 return max_current;
549 }
550
sd_set_current_limit(struct mmc_card * card,u8 * status)551 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
552 {
553 int current_limit = SD_SET_CURRENT_NO_CHANGE;
554 int err;
555 u32 max_current;
556
557 /*
558 * Current limit switch is only defined for SDR50, SDR104, and DDR50
559 * bus speed modes. For other bus speed modes, we do not change the
560 * current limit.
561 */
562 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
563 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
564 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
565 return 0;
566
567 /*
568 * Host has different current capabilities when operating at
569 * different voltages, so find out its max current first.
570 */
571 max_current = sd_get_host_max_current(card->host);
572
573 /*
574 * We only check host's capability here, if we set a limit that is
575 * higher than the card's maximum current, the card will be using its
576 * maximum current, e.g. if the card's maximum current is 300ma, and
577 * when we set current limit to 200ma, the card will draw 200ma, and
578 * when we set current limit to 400/600/800ma, the card will draw its
579 * maximum 300ma from the host.
580 *
581 * The above is incorrect: if we try to set a current limit that is
582 * not supported by the card, the card can rightfully error out the
583 * attempt, and remain at the default current limit. This results
584 * in a 300mA card being limited to 200mA even though the host
585 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
586 * an iMX6 host. --rmk
587 */
588 if (max_current >= 800 &&
589 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
590 current_limit = SD_SET_CURRENT_LIMIT_800;
591 else if (max_current >= 600 &&
592 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
593 current_limit = SD_SET_CURRENT_LIMIT_600;
594 else if (max_current >= 400 &&
595 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
596 current_limit = SD_SET_CURRENT_LIMIT_400;
597 else if (max_current >= 200 &&
598 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
599 current_limit = SD_SET_CURRENT_LIMIT_200;
600
601 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
602 err = mmc_sd_switch(card, SD_SWITCH_SET, 3,
603 current_limit, status);
604 if (err)
605 return err;
606
607 if (((status[15] >> 4) & 0x0F) != current_limit)
608 pr_warn("%s: Problem setting current limit!\n",
609 mmc_hostname(card->host));
610
611 }
612
613 return 0;
614 }
615
616 /*
617 * Determine if the card should tune or not.
618 */
mmc_sd_use_tuning(struct mmc_card * card)619 static bool mmc_sd_use_tuning(struct mmc_card *card)
620 {
621 /*
622 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
623 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
624 */
625 if (mmc_host_is_spi(card->host))
626 return false;
627
628 switch (card->host->ios.timing) {
629 case MMC_TIMING_UHS_SDR50:
630 case MMC_TIMING_UHS_SDR104:
631 return true;
632 case MMC_TIMING_UHS_DDR50:
633 return !mmc_card_no_uhs_ddr50_tuning(card);
634 }
635
636 return false;
637 }
638
639 /*
640 * UHS-I specific initialization procedure
641 */
mmc_sd_init_uhs_card(struct mmc_card * card)642 static int mmc_sd_init_uhs_card(struct mmc_card *card)
643 {
644 int err;
645 u8 *status;
646
647 if (!(card->csd.cmdclass & CCC_SWITCH))
648 return 0;
649
650 status = kmalloc(64, GFP_KERNEL);
651 if (!status)
652 return -ENOMEM;
653
654 /* Set 4-bit bus width */
655 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
656 if (err)
657 goto out;
658
659 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
660
661 /*
662 * Select the bus speed mode depending on host
663 * and card capability.
664 */
665 sd_update_bus_speed_mode(card);
666
667 /* Set the driver strength for the card */
668 err = sd_select_driver_type(card, status);
669 if (err)
670 goto out;
671
672 /* Set current limit for the card */
673 err = sd_set_current_limit(card, status);
674 if (err)
675 goto out;
676
677 /* Set bus speed mode of the card */
678 err = sd_set_bus_speed_mode(card, status);
679 if (err)
680 goto out;
681
682 if (mmc_sd_use_tuning(card)) {
683 err = mmc_execute_tuning(card);
684
685 /*
686 * As SD Specifications Part1 Physical Layer Specification
687 * Version 3.01 says, CMD19 tuning is available for unlocked
688 * cards in transfer state of 1.8V signaling mode. The small
689 * difference between v3.00 and 3.01 spec means that CMD19
690 * tuning is also available for DDR50 mode.
691 */
692 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
693 pr_warn("%s: ddr50 tuning failed\n",
694 mmc_hostname(card->host));
695 err = 0;
696 }
697 }
698
699 out:
700 kfree(status);
701
702 return err;
703 }
704
705 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
706 card->raw_cid[2], card->raw_cid[3]);
707 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
708 card->raw_csd[2], card->raw_csd[3]);
709 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
710 MMC_DEV_ATTR(ssr,
711 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
712 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
713 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
714 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
715 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
716 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
717 card->raw_ssr[15]);
718 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
719 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
720 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
721 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
722 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
723 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
724 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
725 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
726 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
727 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
728 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
729
730
mmc_dsr_show(struct device * dev,struct device_attribute * attr,char * buf)731 static ssize_t mmc_dsr_show(struct device *dev, struct device_attribute *attr,
732 char *buf)
733 {
734 struct mmc_card *card = mmc_dev_to_card(dev);
735 struct mmc_host *host = card->host;
736
737 if (card->csd.dsr_imp && host->dsr_req)
738 return sysfs_emit(buf, "0x%x\n", host->dsr);
739 /* return default DSR value */
740 return sysfs_emit(buf, "0x%x\n", 0x404);
741 }
742
743 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
744
745 MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
746 MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
747 MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev);
748
749 #define sdio_info_attr(num) \
750 static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
751 { \
752 struct mmc_card *card = mmc_dev_to_card(dev); \
753 \
754 if (num > card->num_info) \
755 return -ENODATA; \
756 if (!card->info[num - 1][0]) \
757 return 0; \
758 return sysfs_emit(buf, "%s\n", card->info[num - 1]); \
759 } \
760 static DEVICE_ATTR_RO(info##num)
761
762 sdio_info_attr(1);
763 sdio_info_attr(2);
764 sdio_info_attr(3);
765 sdio_info_attr(4);
766
767 static struct attribute *sd_std_attrs[] = {
768 &dev_attr_vendor.attr,
769 &dev_attr_device.attr,
770 &dev_attr_revision.attr,
771 &dev_attr_info1.attr,
772 &dev_attr_info2.attr,
773 &dev_attr_info3.attr,
774 &dev_attr_info4.attr,
775 &dev_attr_cid.attr,
776 &dev_attr_csd.attr,
777 &dev_attr_scr.attr,
778 &dev_attr_ssr.attr,
779 &dev_attr_date.attr,
780 &dev_attr_erase_size.attr,
781 &dev_attr_preferred_erase_size.attr,
782 &dev_attr_fwrev.attr,
783 &dev_attr_hwrev.attr,
784 &dev_attr_manfid.attr,
785 &dev_attr_name.attr,
786 &dev_attr_oemid.attr,
787 &dev_attr_serial.attr,
788 &dev_attr_ocr.attr,
789 &dev_attr_rca.attr,
790 &dev_attr_dsr.attr,
791 NULL,
792 };
793
sd_std_is_visible(struct kobject * kobj,struct attribute * attr,int index)794 static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr,
795 int index)
796 {
797 struct device *dev = kobj_to_dev(kobj);
798 struct mmc_card *card = mmc_dev_to_card(dev);
799
800 /* CIS vendor and device ids, revision and info string are available only for Combo cards */
801 if ((attr == &dev_attr_vendor.attr ||
802 attr == &dev_attr_device.attr ||
803 attr == &dev_attr_revision.attr ||
804 attr == &dev_attr_info1.attr ||
805 attr == &dev_attr_info2.attr ||
806 attr == &dev_attr_info3.attr ||
807 attr == &dev_attr_info4.attr
808 ) &&!mmc_card_sd_combo(card))
809 return 0;
810
811 return attr->mode;
812 }
813
814 static const struct attribute_group sd_std_group = {
815 .attrs = sd_std_attrs,
816 .is_visible = sd_std_is_visible,
817 };
818 __ATTRIBUTE_GROUPS(sd_std);
819
820 const struct device_type sd_type = {
821 .groups = sd_std_groups,
822 };
823
824 /*
825 * Fetch CID from card.
826 */
mmc_sd_get_cid(struct mmc_host * host,u32 ocr,u32 * cid,u32 * rocr)827 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
828 {
829 int err;
830 u32 max_current;
831 int retries = 10;
832 u32 pocr = ocr;
833
834 try_again:
835 if (!retries) {
836 ocr &= ~SD_OCR_S18R;
837 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
838 }
839
840 /*
841 * Since we're changing the OCR value, we seem to
842 * need to tell some cards to go back to the idle
843 * state. We wait 1ms to give cards time to
844 * respond.
845 */
846 mmc_go_idle(host);
847
848 /*
849 * If SD_SEND_IF_COND indicates an SD 2.0
850 * compliant card and we should set bit 30
851 * of the ocr to indicate that we can handle
852 * block-addressed SDHC cards.
853 */
854 err = mmc_send_if_cond(host, ocr);
855 if (!err)
856 ocr |= SD_OCR_CCS;
857
858 /*
859 * If the host supports one of UHS-I modes, request the card
860 * to switch to 1.8V signaling level. If the card has failed
861 * repeatedly to switch however, skip this.
862 */
863 if (retries && mmc_host_uhs(host))
864 ocr |= SD_OCR_S18R;
865
866 /*
867 * If the host can supply more than 150mA at current voltage,
868 * XPC should be set to 1.
869 */
870 max_current = sd_get_host_max_current(host);
871 if (max_current > 150)
872 ocr |= SD_OCR_XPC;
873
874 err = mmc_send_app_op_cond(host, ocr, rocr);
875 if (err)
876 return err;
877
878 /*
879 * In case the S18A bit is set in the response, let's start the signal
880 * voltage switch procedure. SPI mode doesn't support CMD11.
881 * Note that, according to the spec, the S18A bit is not valid unless
882 * the CCS bit is set as well. We deliberately deviate from the spec in
883 * regards to this, which allows UHS-I to be supported for SDSC cards.
884 */
885 if (!mmc_host_is_spi(host) && (ocr & SD_OCR_S18R) &&
886 rocr && (*rocr & SD_ROCR_S18A)) {
887 err = mmc_set_uhs_voltage(host, pocr);
888 if (err == -EAGAIN) {
889 retries--;
890 goto try_again;
891 } else if (err) {
892 retries = 0;
893 goto try_again;
894 }
895 }
896
897 err = mmc_send_cid(host, cid);
898 return err;
899 }
900
mmc_sd_get_csd(struct mmc_card * card,bool is_sduc)901 int mmc_sd_get_csd(struct mmc_card *card, bool is_sduc)
902 {
903 int err;
904
905 /*
906 * Fetch CSD from card.
907 */
908 err = mmc_send_csd(card, card->raw_csd);
909 if (err)
910 return err;
911
912 err = mmc_decode_csd(card, is_sduc);
913 if (err)
914 return err;
915
916 return 0;
917 }
918
mmc_sd_get_ro(struct mmc_host * host)919 static int mmc_sd_get_ro(struct mmc_host *host)
920 {
921 int ro;
922
923 /*
924 * Some systems don't feature a write-protect pin and don't need one.
925 * E.g. because they only have micro-SD card slot. For those systems
926 * assume that the SD card is always read-write.
927 */
928 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
929 return 0;
930
931 if (!host->ops->get_ro)
932 return -1;
933
934 ro = host->ops->get_ro(host);
935
936 return ro;
937 }
938
mmc_sd_setup_card(struct mmc_host * host,struct mmc_card * card,bool reinit)939 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
940 bool reinit)
941 {
942 int err;
943
944 if (!reinit) {
945 /*
946 * Fetch SCR from card.
947 */
948 err = mmc_app_send_scr(card);
949 if (err)
950 return err;
951
952 err = mmc_decode_scr(card);
953 if (err)
954 return err;
955
956 /*
957 * Fetch and process SD Status register.
958 */
959 err = mmc_read_ssr(card);
960 if (err)
961 return err;
962
963 /* Erase init depends on CSD and SSR */
964 mmc_init_erase(card);
965 }
966
967 /*
968 * Fetch switch information from card. Note, sd3_bus_mode can change if
969 * voltage switch outcome changes, so do this always.
970 */
971 err = mmc_read_switch(card);
972 if (err)
973 return err;
974
975 /*
976 * For SPI, enable CRC as appropriate.
977 * This CRC enable is located AFTER the reading of the
978 * card registers because some SDHC cards are not able
979 * to provide valid CRCs for non-512-byte blocks.
980 */
981 if (mmc_host_is_spi(host)) {
982 err = mmc_spi_set_crc(host, use_spi_crc);
983 if (err)
984 return err;
985 }
986
987 /*
988 * Check if read-only switch is active.
989 */
990 if (!reinit) {
991 int ro = mmc_sd_get_ro(host);
992
993 if (ro < 0) {
994 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
995 mmc_hostname(host));
996 } else if (ro > 0) {
997 mmc_card_set_readonly(card);
998 }
999 }
1000
1001 return 0;
1002 }
1003
mmc_sd_get_max_clock(struct mmc_card * card)1004 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
1005 {
1006 unsigned max_dtr = (unsigned int)-1;
1007
1008 if (mmc_card_hs(card)) {
1009 if (max_dtr > card->sw_caps.hs_max_dtr)
1010 max_dtr = card->sw_caps.hs_max_dtr;
1011 } else if (max_dtr > card->csd.max_dtr) {
1012 max_dtr = card->csd.max_dtr;
1013 }
1014
1015 return max_dtr;
1016 }
1017
mmc_sd_card_using_v18(struct mmc_card * card)1018 static bool mmc_sd_card_using_v18(struct mmc_card *card)
1019 {
1020 /*
1021 * According to the SD spec., the Bus Speed Mode (function group 1) bits
1022 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus
1023 * they can be used to determine if the card has already switched to
1024 * 1.8V signaling.
1025 */
1026 return card->sw_caps.sd3_bus_mode &
1027 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50);
1028 }
1029
sd_write_ext_reg(struct mmc_card * card,u8 fno,u8 page,u16 offset,u8 reg_data)1030 static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, u16 offset,
1031 u8 reg_data)
1032 {
1033 struct mmc_host *host = card->host;
1034 struct mmc_request mrq = {};
1035 struct mmc_command cmd = {};
1036 struct mmc_data data = {};
1037 struct scatterlist sg;
1038 u8 *reg_buf;
1039
1040 reg_buf = kzalloc(512, GFP_KERNEL);
1041 if (!reg_buf)
1042 return -ENOMEM;
1043
1044 mrq.cmd = &cmd;
1045 mrq.data = &data;
1046
1047 /*
1048 * Arguments of CMD49:
1049 * [31:31] MIO (0 = memory).
1050 * [30:27] FNO (function number).
1051 * [26:26] MW - mask write mode (0 = disable).
1052 * [25:18] page number.
1053 * [17:9] offset address.
1054 * [8:0] length (0 = 1 byte).
1055 */
1056 cmd.arg = fno << 27 | page << 18 | offset << 9;
1057
1058 /* The first byte in the buffer is the data to be written. */
1059 reg_buf[0] = reg_data;
1060
1061 data.flags = MMC_DATA_WRITE;
1062 data.blksz = 512;
1063 data.blocks = 1;
1064 data.sg = &sg;
1065 data.sg_len = 1;
1066 sg_init_one(&sg, reg_buf, 512);
1067
1068 cmd.opcode = SD_WRITE_EXTR_SINGLE;
1069 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1070
1071 mmc_set_data_timeout(&data, card);
1072 mmc_wait_for_req(host, &mrq);
1073
1074 kfree(reg_buf);
1075
1076 /*
1077 * Note that, the SD card is allowed to signal busy on DAT0 up to 1s
1078 * after the CMD49. Although, let's leave this to be managed by the
1079 * caller.
1080 */
1081
1082 if (cmd.error)
1083 return cmd.error;
1084 if (data.error)
1085 return data.error;
1086
1087 return 0;
1088 }
1089
sd_read_ext_reg(struct mmc_card * card,u8 fno,u8 page,u16 offset,u16 len,u8 * reg_buf)1090 static int sd_read_ext_reg(struct mmc_card *card, u8 fno, u8 page,
1091 u16 offset, u16 len, u8 *reg_buf)
1092 {
1093 u32 cmd_args;
1094
1095 /*
1096 * Command arguments of CMD48:
1097 * [31:31] MIO (0 = memory).
1098 * [30:27] FNO (function number).
1099 * [26:26] reserved (0).
1100 * [25:18] page number.
1101 * [17:9] offset address.
1102 * [8:0] length (0 = 1 byte, 1ff = 512 bytes).
1103 */
1104 cmd_args = fno << 27 | page << 18 | offset << 9 | (len -1);
1105
1106 return mmc_send_adtc_data(card, card->host, SD_READ_EXTR_SINGLE,
1107 cmd_args, reg_buf, 512);
1108 }
1109
sd_parse_ext_reg_power(struct mmc_card * card,u8 fno,u8 page,u16 offset)1110 static int sd_parse_ext_reg_power(struct mmc_card *card, u8 fno, u8 page,
1111 u16 offset)
1112 {
1113 int err;
1114 u8 *reg_buf;
1115
1116 reg_buf = kzalloc(512, GFP_KERNEL);
1117 if (!reg_buf)
1118 return -ENOMEM;
1119
1120 /* Read the extension register for power management function. */
1121 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf);
1122 if (err) {
1123 pr_warn("%s: error %d reading PM func of ext reg\n",
1124 mmc_hostname(card->host), err);
1125 goto out;
1126 }
1127
1128 /* PM revision consists of 4 bits. */
1129 card->ext_power.rev = reg_buf[0] & 0xf;
1130
1131 /* Power Off Notification support at bit 4. */
1132 if ((reg_buf[1] & BIT(4)) && !mmc_card_broken_sd_poweroff_notify(card))
1133 card->ext_power.feature_support |= SD_EXT_POWER_OFF_NOTIFY;
1134
1135 /* Power Sustenance support at bit 5. */
1136 if (reg_buf[1] & BIT(5))
1137 card->ext_power.feature_support |= SD_EXT_POWER_SUSTENANCE;
1138
1139 /* Power Down Mode support at bit 6. */
1140 if (reg_buf[1] & BIT(6))
1141 card->ext_power.feature_support |= SD_EXT_POWER_DOWN_MODE;
1142
1143 card->ext_power.fno = fno;
1144 card->ext_power.page = page;
1145 card->ext_power.offset = offset;
1146
1147 out:
1148 kfree(reg_buf);
1149 return err;
1150 }
1151
sd_parse_ext_reg_perf(struct mmc_card * card,u8 fno,u8 page,u16 offset)1152 static int sd_parse_ext_reg_perf(struct mmc_card *card, u8 fno, u8 page,
1153 u16 offset)
1154 {
1155 int err;
1156 u8 *reg_buf;
1157
1158 reg_buf = kzalloc(512, GFP_KERNEL);
1159 if (!reg_buf)
1160 return -ENOMEM;
1161
1162 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf);
1163 if (err) {
1164 pr_warn("%s: error %d reading PERF func of ext reg\n",
1165 mmc_hostname(card->host), err);
1166 goto out;
1167 }
1168
1169 /* PERF revision. */
1170 card->ext_perf.rev = reg_buf[0];
1171
1172 /* FX_EVENT support at bit 0. */
1173 if (reg_buf[1] & BIT(0))
1174 card->ext_perf.feature_support |= SD_EXT_PERF_FX_EVENT;
1175
1176 /* Card initiated self-maintenance support at bit 0. */
1177 if (reg_buf[2] & BIT(0))
1178 card->ext_perf.feature_support |= SD_EXT_PERF_CARD_MAINT;
1179
1180 /* Host initiated self-maintenance support at bit 1. */
1181 if (reg_buf[2] & BIT(1))
1182 card->ext_perf.feature_support |= SD_EXT_PERF_HOST_MAINT;
1183
1184 /* Cache support at bit 0. */
1185 if ((reg_buf[4] & BIT(0)) && !mmc_card_broken_sd_cache(card))
1186 card->ext_perf.feature_support |= SD_EXT_PERF_CACHE;
1187
1188 /* Command queue support indicated via queue depth bits (0 to 4). */
1189 if (reg_buf[6] & 0x1f)
1190 card->ext_perf.feature_support |= SD_EXT_PERF_CMD_QUEUE;
1191
1192 card->ext_perf.fno = fno;
1193 card->ext_perf.page = page;
1194 card->ext_perf.offset = offset;
1195
1196 out:
1197 kfree(reg_buf);
1198 return err;
1199 }
1200
sd_parse_ext_reg(struct mmc_card * card,u8 * gen_info_buf,u16 * next_ext_addr)1201 static int sd_parse_ext_reg(struct mmc_card *card, u8 *gen_info_buf,
1202 u16 *next_ext_addr)
1203 {
1204 u8 num_regs, fno, page;
1205 u16 sfc, offset, ext = *next_ext_addr;
1206 u32 reg_addr;
1207
1208 /*
1209 * Parse only one register set per extension, as that is sufficient to
1210 * support the standard functions. This means another 48 bytes in the
1211 * buffer must be available.
1212 */
1213 if (ext + 48 > 512)
1214 return -EFAULT;
1215
1216 /* Standard Function Code */
1217 memcpy(&sfc, &gen_info_buf[ext], 2);
1218
1219 /* Address to the next extension. */
1220 memcpy(next_ext_addr, &gen_info_buf[ext + 40], 2);
1221
1222 /* Number of registers for this extension. */
1223 num_regs = gen_info_buf[ext + 42];
1224
1225 /* We support only one register per extension. */
1226 if (num_regs != 1)
1227 return 0;
1228
1229 /* Extension register address. */
1230 memcpy(®_addr, &gen_info_buf[ext + 44], 4);
1231
1232 /* 9 bits (0 to 8) contains the offset address. */
1233 offset = reg_addr & 0x1ff;
1234
1235 /* 8 bits (9 to 16) contains the page number. */
1236 page = reg_addr >> 9 & 0xff ;
1237
1238 /* 4 bits (18 to 21) contains the function number. */
1239 fno = reg_addr >> 18 & 0xf;
1240
1241 /* Standard Function Code for power management. */
1242 if (sfc == 0x1)
1243 return sd_parse_ext_reg_power(card, fno, page, offset);
1244
1245 /* Standard Function Code for performance enhancement. */
1246 if (sfc == 0x2)
1247 return sd_parse_ext_reg_perf(card, fno, page, offset);
1248
1249 return 0;
1250 }
1251
sd_read_ext_regs(struct mmc_card * card)1252 static int sd_read_ext_regs(struct mmc_card *card)
1253 {
1254 int err, i;
1255 u8 num_ext, *gen_info_buf;
1256 u16 rev, len, next_ext_addr;
1257
1258 if (mmc_host_is_spi(card->host))
1259 return 0;
1260
1261 if (!(card->scr.cmds & SD_SCR_CMD48_SUPPORT))
1262 return 0;
1263
1264 gen_info_buf = kzalloc(512, GFP_KERNEL);
1265 if (!gen_info_buf)
1266 return -ENOMEM;
1267
1268 /*
1269 * Read 512 bytes of general info, which is found at function number 0,
1270 * at page 0 and with no offset.
1271 */
1272 err = sd_read_ext_reg(card, 0, 0, 0, 512, gen_info_buf);
1273 if (err) {
1274 pr_err("%s: error %d reading general info of SD ext reg\n",
1275 mmc_hostname(card->host), err);
1276 goto out;
1277 }
1278
1279 /* General info structure revision. */
1280 memcpy(&rev, &gen_info_buf[0], 2);
1281
1282 /* Length of general info in bytes. */
1283 memcpy(&len, &gen_info_buf[2], 2);
1284
1285 /* Number of extensions to be find. */
1286 num_ext = gen_info_buf[4];
1287
1288 /*
1289 * We only support revision 0 and limit it to 512 bytes for simplicity.
1290 * No matter what, let's return zero to allow us to continue using the
1291 * card, even if we can't support the features from the SD function
1292 * extensions registers.
1293 */
1294 if (rev != 0 || len > 512) {
1295 pr_warn("%s: non-supported SD ext reg layout\n",
1296 mmc_hostname(card->host));
1297 goto out;
1298 }
1299
1300 /*
1301 * Parse the extension registers. The first extension should start
1302 * immediately after the general info header (16 bytes).
1303 */
1304 next_ext_addr = 16;
1305 for (i = 0; i < num_ext; i++) {
1306 err = sd_parse_ext_reg(card, gen_info_buf, &next_ext_addr);
1307 if (err) {
1308 pr_err("%s: error %d parsing SD ext reg\n",
1309 mmc_hostname(card->host), err);
1310 goto out;
1311 }
1312 }
1313
1314 out:
1315 kfree(gen_info_buf);
1316 return err;
1317 }
1318
sd_cache_enabled(struct mmc_host * host)1319 static bool sd_cache_enabled(struct mmc_host *host)
1320 {
1321 return host->card->ext_perf.feature_enabled & SD_EXT_PERF_CACHE;
1322 }
1323
sd_flush_cache(struct mmc_host * host)1324 static int sd_flush_cache(struct mmc_host *host)
1325 {
1326 struct mmc_card *card = host->card;
1327 u8 *reg_buf, fno, page;
1328 u16 offset;
1329 int err;
1330
1331 if (!sd_cache_enabled(host))
1332 return 0;
1333
1334 reg_buf = kzalloc(512, GFP_KERNEL);
1335 if (!reg_buf)
1336 return -ENOMEM;
1337
1338 /*
1339 * Set Flush Cache at bit 0 in the performance enhancement register at
1340 * 261 bytes offset.
1341 */
1342 fno = card->ext_perf.fno;
1343 page = card->ext_perf.page;
1344 offset = card->ext_perf.offset + 261;
1345
1346 err = sd_write_ext_reg(card, fno, page, offset, BIT(0));
1347 if (err) {
1348 pr_warn("%s: error %d writing Cache Flush bit\n",
1349 mmc_hostname(host), err);
1350 goto out;
1351 }
1352
1353 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1354 MMC_BUSY_EXTR_SINGLE);
1355 if (err)
1356 goto out;
1357
1358 /*
1359 * Read the Flush Cache bit. The card shall reset it, to confirm that
1360 * it's has completed the flushing of the cache.
1361 */
1362 err = sd_read_ext_reg(card, fno, page, offset, 1, reg_buf);
1363 if (err) {
1364 pr_warn("%s: error %d reading Cache Flush bit\n",
1365 mmc_hostname(host), err);
1366 goto out;
1367 }
1368
1369 if (reg_buf[0] & BIT(0))
1370 err = -ETIMEDOUT;
1371 out:
1372 kfree(reg_buf);
1373 return err;
1374 }
1375
sd_enable_cache(struct mmc_card * card)1376 static int sd_enable_cache(struct mmc_card *card)
1377 {
1378 u8 *reg_buf;
1379 int err;
1380
1381 card->ext_perf.feature_enabled &= ~SD_EXT_PERF_CACHE;
1382
1383 reg_buf = kzalloc(512, GFP_KERNEL);
1384 if (!reg_buf)
1385 return -ENOMEM;
1386
1387 /*
1388 * Set Cache Enable at bit 0 in the performance enhancement register at
1389 * 260 bytes offset.
1390 */
1391 err = sd_write_ext_reg(card, card->ext_perf.fno, card->ext_perf.page,
1392 card->ext_perf.offset + 260, BIT(0));
1393 if (err) {
1394 pr_warn("%s: error %d writing Cache Enable bit\n",
1395 mmc_hostname(card->host), err);
1396 goto out;
1397 }
1398
1399 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1400 MMC_BUSY_EXTR_SINGLE);
1401 if (!err)
1402 card->ext_perf.feature_enabled |= SD_EXT_PERF_CACHE;
1403
1404 out:
1405 kfree(reg_buf);
1406 return err;
1407 }
1408
1409 /*
1410 * Handle the detection and initialisation of a card.
1411 *
1412 * In the case of a resume, "oldcard" will contain the card
1413 * we're trying to reinitialise.
1414 */
mmc_sd_init_card(struct mmc_host * host,u32 ocr,struct mmc_card * oldcard)1415 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
1416 struct mmc_card *oldcard)
1417 {
1418 struct mmc_card *card;
1419 int err;
1420 u32 cid[4];
1421 u32 rocr = 0;
1422 bool v18_fixup_failed = false;
1423
1424 WARN_ON(!host->claimed);
1425 retry:
1426 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
1427 if (err)
1428 return err;
1429
1430 if (oldcard) {
1431 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1432 pr_debug("%s: Perhaps the card was replaced\n",
1433 mmc_hostname(host));
1434 return -ENOENT;
1435 }
1436
1437 card = oldcard;
1438 } else {
1439 /*
1440 * Allocate card structure.
1441 */
1442 card = mmc_alloc_card(host, &sd_type);
1443 if (IS_ERR(card))
1444 return PTR_ERR(card);
1445
1446 card->ocr = ocr;
1447 card->type = MMC_TYPE_SD;
1448 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1449 }
1450
1451 /*
1452 * Call the optional HC's init_card function to handle quirks.
1453 */
1454 if (host->ops->init_card)
1455 host->ops->init_card(host, card);
1456
1457 /*
1458 * For native busses: get card RCA and quit open drain mode.
1459 */
1460 if (!mmc_host_is_spi(host)) {
1461 err = mmc_send_relative_addr(host, &card->rca);
1462 if (err)
1463 goto free_card;
1464 }
1465
1466 if (!oldcard) {
1467 err = mmc_sd_get_csd(card, false);
1468 if (err)
1469 goto free_card;
1470
1471 mmc_decode_cid(card);
1472 }
1473
1474 /*
1475 * handling only for cards supporting DSR and hosts requesting
1476 * DSR configuration
1477 */
1478 if (card->csd.dsr_imp && host->dsr_req)
1479 mmc_set_dsr(host);
1480
1481 /*
1482 * Select card, as all following commands rely on that.
1483 */
1484 if (!mmc_host_is_spi(host)) {
1485 err = mmc_select_card(card);
1486 if (err)
1487 goto free_card;
1488 }
1489
1490 /* Apply quirks prior to card setup */
1491 mmc_fixup_device(card, mmc_sd_fixups);
1492
1493 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1494 if (err)
1495 goto free_card;
1496
1497 /*
1498 * If the card has not been power cycled, it may still be using 1.8V
1499 * signaling. Detect that situation and try to initialize a UHS-I (1.8V)
1500 * transfer mode.
1501 */
1502 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
1503 mmc_sd_card_using_v18(card) &&
1504 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
1505 if (mmc_host_set_uhs_voltage(host) ||
1506 mmc_sd_init_uhs_card(card)) {
1507 v18_fixup_failed = true;
1508 mmc_power_cycle(host, ocr);
1509 if (!oldcard)
1510 mmc_remove_card(card);
1511 goto retry;
1512 }
1513 goto cont;
1514 }
1515
1516 /* Initialization sequence for UHS-I cards */
1517 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {
1518 err = mmc_sd_init_uhs_card(card);
1519 if (err)
1520 goto free_card;
1521 } else {
1522 /*
1523 * Attempt to change to high-speed (if supported)
1524 */
1525 err = mmc_sd_switch_hs(card);
1526 if (err > 0)
1527 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1528 else if (err)
1529 goto free_card;
1530
1531 /*
1532 * Set bus speed.
1533 */
1534 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1535
1536 if (host->ios.timing == MMC_TIMING_SD_HS &&
1537 host->ops->prepare_sd_hs_tuning) {
1538 err = host->ops->prepare_sd_hs_tuning(host, card);
1539 if (err)
1540 goto free_card;
1541 }
1542
1543 /*
1544 * Switch to wider bus (if supported).
1545 */
1546 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1547 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1548 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1549 if (err)
1550 goto free_card;
1551
1552 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1553 }
1554
1555 if (host->ios.timing == MMC_TIMING_SD_HS &&
1556 host->ops->execute_sd_hs_tuning) {
1557 err = host->ops->execute_sd_hs_tuning(host, card);
1558 if (err)
1559 goto free_card;
1560 }
1561 }
1562 cont:
1563 if (!oldcard) {
1564 /* Read/parse the extension registers. */
1565 err = sd_read_ext_regs(card);
1566 if (err)
1567 goto free_card;
1568 }
1569
1570 /* Enable internal SD cache if supported. */
1571 if (card->ext_perf.feature_support & SD_EXT_PERF_CACHE) {
1572 err = sd_enable_cache(card);
1573 if (err)
1574 goto free_card;
1575 }
1576
1577 if (host->cqe_ops && !host->cqe_enabled) {
1578 err = host->cqe_ops->cqe_enable(host, card);
1579 if (!err) {
1580 host->cqe_enabled = true;
1581 host->hsq_enabled = true;
1582 pr_info("%s: Host Software Queue enabled\n",
1583 mmc_hostname(host));
1584 }
1585 }
1586
1587 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1588 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1589 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1590 mmc_hostname(host));
1591 err = -EINVAL;
1592 goto free_card;
1593 }
1594
1595 host->card = card;
1596 return 0;
1597
1598 free_card:
1599 if (!oldcard)
1600 mmc_remove_card(card);
1601
1602 return err;
1603 }
1604
1605 /*
1606 * Host is being removed. Free up the current card.
1607 */
mmc_sd_remove(struct mmc_host * host)1608 static void mmc_sd_remove(struct mmc_host *host)
1609 {
1610 mmc_remove_card(host->card);
1611 host->card = NULL;
1612 }
1613
1614 /*
1615 * Card detection - card is alive.
1616 */
mmc_sd_alive(struct mmc_host * host)1617 static int mmc_sd_alive(struct mmc_host *host)
1618 {
1619 return mmc_send_status(host->card, NULL);
1620 }
1621
1622 /*
1623 * Card detection callback from host.
1624 */
mmc_sd_detect(struct mmc_host * host)1625 static void mmc_sd_detect(struct mmc_host *host)
1626 {
1627 int err;
1628
1629 mmc_get_card(host->card, NULL);
1630
1631 /*
1632 * Just check if our card has been removed.
1633 */
1634 err = _mmc_detect_card_removed(host);
1635
1636 mmc_put_card(host->card, NULL);
1637
1638 if (err) {
1639 mmc_sd_remove(host);
1640
1641 mmc_claim_host(host);
1642 mmc_detach_bus(host);
1643 mmc_power_off(host);
1644 mmc_release_host(host);
1645 }
1646 }
1647
sd_can_poweroff_notify(struct mmc_card * card)1648 static int sd_can_poweroff_notify(struct mmc_card *card)
1649 {
1650 return card->ext_power.feature_support & SD_EXT_POWER_OFF_NOTIFY;
1651 }
1652
sd_busy_poweroff_notify_cb(void * cb_data,bool * busy)1653 static int sd_busy_poweroff_notify_cb(void *cb_data, bool *busy)
1654 {
1655 struct sd_busy_data *data = cb_data;
1656 struct mmc_card *card = data->card;
1657 int err;
1658
1659 /*
1660 * Read the status register for the power management function. It's at
1661 * one byte offset and is one byte long. The Power Off Notification
1662 * Ready is bit 0.
1663 */
1664 err = sd_read_ext_reg(card, card->ext_power.fno, card->ext_power.page,
1665 card->ext_power.offset + 1, 1, data->reg_buf);
1666 if (err) {
1667 pr_warn("%s: error %d reading status reg of PM func\n",
1668 mmc_hostname(card->host), err);
1669 return err;
1670 }
1671
1672 *busy = !(data->reg_buf[0] & BIT(0));
1673 return 0;
1674 }
1675
sd_poweroff_notify(struct mmc_card * card)1676 static int sd_poweroff_notify(struct mmc_card *card)
1677 {
1678 struct sd_busy_data cb_data;
1679 u8 *reg_buf;
1680 int err;
1681
1682 reg_buf = kzalloc(512, GFP_KERNEL);
1683 if (!reg_buf)
1684 return -ENOMEM;
1685
1686 /*
1687 * Set the Power Off Notification bit in the power management settings
1688 * register at 2 bytes offset.
1689 */
1690 err = sd_write_ext_reg(card, card->ext_power.fno, card->ext_power.page,
1691 card->ext_power.offset + 2, BIT(0));
1692 if (err) {
1693 pr_warn("%s: error %d writing Power Off Notify bit\n",
1694 mmc_hostname(card->host), err);
1695 goto out;
1696 }
1697
1698 /* Find out when the command is completed. */
1699 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1700 MMC_BUSY_EXTR_SINGLE);
1701 if (err)
1702 goto out;
1703
1704 cb_data.card = card;
1705 cb_data.reg_buf = reg_buf;
1706 err = __mmc_poll_for_busy(card->host, 0, SD_POWEROFF_NOTIFY_TIMEOUT_MS,
1707 &sd_busy_poweroff_notify_cb, &cb_data);
1708
1709 out:
1710 kfree(reg_buf);
1711 return err;
1712 }
1713
_mmc_sd_suspend(struct mmc_host * host)1714 static int _mmc_sd_suspend(struct mmc_host *host)
1715 {
1716 struct mmc_card *card = host->card;
1717 int err = 0;
1718
1719 mmc_claim_host(host);
1720
1721 if (mmc_card_suspended(card))
1722 goto out;
1723
1724 if (sd_can_poweroff_notify(card))
1725 err = sd_poweroff_notify(card);
1726 else if (!mmc_host_is_spi(host))
1727 err = mmc_deselect_cards(host);
1728
1729 if (!err) {
1730 mmc_power_off(host);
1731 mmc_card_set_suspended(card);
1732 }
1733
1734 out:
1735 mmc_release_host(host);
1736 return err;
1737 }
1738
1739 /*
1740 * Callback for suspend
1741 */
mmc_sd_suspend(struct mmc_host * host)1742 static int mmc_sd_suspend(struct mmc_host *host)
1743 {
1744 int err;
1745
1746 err = _mmc_sd_suspend(host);
1747 if (!err) {
1748 pm_runtime_disable(&host->card->dev);
1749 pm_runtime_set_suspended(&host->card->dev);
1750 }
1751
1752 return err;
1753 }
1754
1755 /*
1756 * This function tries to determine if the same card is still present
1757 * and, if so, restore all state to it.
1758 */
_mmc_sd_resume(struct mmc_host * host)1759 static int _mmc_sd_resume(struct mmc_host *host)
1760 {
1761 int err = 0;
1762
1763 mmc_claim_host(host);
1764
1765 if (!mmc_card_suspended(host->card))
1766 goto out;
1767
1768 mmc_power_up(host, host->card->ocr);
1769 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1770 mmc_card_clr_suspended(host->card);
1771
1772 out:
1773 mmc_release_host(host);
1774 return err;
1775 }
1776
1777 /*
1778 * Callback for resume
1779 */
mmc_sd_resume(struct mmc_host * host)1780 static int mmc_sd_resume(struct mmc_host *host)
1781 {
1782 pm_runtime_enable(&host->card->dev);
1783 return 0;
1784 }
1785
1786 /*
1787 * Callback for runtime_suspend.
1788 */
mmc_sd_runtime_suspend(struct mmc_host * host)1789 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1790 {
1791 int err;
1792
1793 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1794 return 0;
1795
1796 err = _mmc_sd_suspend(host);
1797 if (err)
1798 pr_err("%s: error %d doing aggressive suspend\n",
1799 mmc_hostname(host), err);
1800
1801 return err;
1802 }
1803
1804 /*
1805 * Callback for runtime_resume.
1806 */
mmc_sd_runtime_resume(struct mmc_host * host)1807 static int mmc_sd_runtime_resume(struct mmc_host *host)
1808 {
1809 int err;
1810
1811 err = _mmc_sd_resume(host);
1812 if (err && err != -ENOMEDIUM)
1813 pr_err("%s: error %d doing runtime resume\n",
1814 mmc_hostname(host), err);
1815
1816 return 0;
1817 }
1818
mmc_sd_hw_reset(struct mmc_host * host)1819 static int mmc_sd_hw_reset(struct mmc_host *host)
1820 {
1821 mmc_power_cycle(host, host->card->ocr);
1822 return mmc_sd_init_card(host, host->card->ocr, host->card);
1823 }
1824
1825 static const struct mmc_bus_ops mmc_sd_ops = {
1826 .remove = mmc_sd_remove,
1827 .detect = mmc_sd_detect,
1828 .runtime_suspend = mmc_sd_runtime_suspend,
1829 .runtime_resume = mmc_sd_runtime_resume,
1830 .suspend = mmc_sd_suspend,
1831 .resume = mmc_sd_resume,
1832 .alive = mmc_sd_alive,
1833 .shutdown = mmc_sd_suspend,
1834 .hw_reset = mmc_sd_hw_reset,
1835 .cache_enabled = sd_cache_enabled,
1836 .flush_cache = sd_flush_cache,
1837 };
1838
1839 /*
1840 * Starting point for SD card init.
1841 */
mmc_attach_sd(struct mmc_host * host)1842 int mmc_attach_sd(struct mmc_host *host)
1843 {
1844 int err;
1845 u32 ocr, rocr;
1846
1847 WARN_ON(!host->claimed);
1848
1849 err = mmc_send_app_op_cond(host, 0, &ocr);
1850 if (err)
1851 return err;
1852
1853 mmc_attach_bus(host, &mmc_sd_ops);
1854 if (host->ocr_avail_sd)
1855 host->ocr_avail = host->ocr_avail_sd;
1856
1857 /*
1858 * We need to get OCR a different way for SPI.
1859 */
1860 if (mmc_host_is_spi(host)) {
1861 mmc_go_idle(host);
1862
1863 err = mmc_spi_read_ocr(host, 0, &ocr);
1864 if (err)
1865 goto err;
1866 }
1867
1868 /*
1869 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1870 * these bits as being in-valid and especially also bit7.
1871 */
1872 ocr &= ~0x7FFF;
1873
1874 rocr = mmc_select_voltage(host, ocr);
1875
1876 /*
1877 * Can we support the voltage(s) of the card(s)?
1878 */
1879 if (!rocr) {
1880 err = -EINVAL;
1881 goto err;
1882 }
1883
1884 /*
1885 * Detect and init the card.
1886 */
1887 err = mmc_sd_init_card(host, rocr, NULL);
1888 if (err)
1889 goto err;
1890
1891 mmc_release_host(host);
1892 err = mmc_add_card(host->card);
1893 if (err)
1894 goto remove_card;
1895
1896 mmc_claim_host(host);
1897 return 0;
1898
1899 remove_card:
1900 mmc_remove_card(host->card);
1901 host->card = NULL;
1902 mmc_claim_host(host);
1903 err:
1904 mmc_detach_bus(host);
1905
1906 pr_err("%s: error %d whilst initialising SD card\n",
1907 mmc_hostname(host), err);
1908
1909 return err;
1910 }
1911