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 UNSTUFF_BITS(resp,start,size) \
60 ({ \
61 const int __size = size; \
62 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
63 const int __off = 3 - ((start) / 32); \
64 const int __shft = (start) & 31; \
65 u32 __res; \
66 \
67 __res = resp[__off] >> __shft; \
68 if (__size + __shft > 32) \
69 __res |= resp[__off-1] << ((32 - __shft) % 32); \
70 __res & __mask; \
71 })
72
73 #define SD_POWEROFF_NOTIFY_TIMEOUT_MS 1000
74 #define SD_WRITE_EXTR_SINGLE_TIMEOUT_MS 1000
75
76 struct sd_busy_data {
77 struct mmc_card *card;
78 u8 *reg_buf;
79 };
80
81 /*
82 * Given the decoded CSD structure, decode the raw CID to our CID structure.
83 */
mmc_decode_cid(struct mmc_card * card)84 void mmc_decode_cid(struct mmc_card *card)
85 {
86 u32 *resp = card->raw_cid;
87
88 /*
89 * Add the raw card ID (cid) data to the entropy pool. It doesn't
90 * matter that not all of it is unique, it's just bonus entropy.
91 */
92 add_device_randomness(&card->raw_cid, sizeof(card->raw_cid));
93
94 /*
95 * SD doesn't currently have a version field so we will
96 * have to assume we can parse this.
97 */
98 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
99 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
100 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
101 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
102 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
103 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
104 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
105 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
106 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
107 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
108 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
109 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
110
111 card->cid.year += 2000; /* SD cards year offset */
112 }
113
114 /*
115 * Given a 128-bit response, decode to our card CSD structure.
116 */
mmc_decode_csd(struct mmc_card * card)117 static int mmc_decode_csd(struct mmc_card *card)
118 {
119 struct mmc_csd *csd = &card->csd;
120 unsigned int e, m, csd_struct;
121 u32 *resp = card->raw_csd;
122
123 csd_struct = UNSTUFF_BITS(resp, 126, 2);
124
125 switch (csd_struct) {
126 case 0:
127 m = UNSTUFF_BITS(resp, 115, 4);
128 e = UNSTUFF_BITS(resp, 112, 3);
129 csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10;
130 csd->taac_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
131
132 m = UNSTUFF_BITS(resp, 99, 4);
133 e = UNSTUFF_BITS(resp, 96, 3);
134 csd->max_dtr = tran_exp[e] * tran_mant[m];
135 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
136
137 e = UNSTUFF_BITS(resp, 47, 3);
138 m = UNSTUFF_BITS(resp, 62, 12);
139 csd->capacity = (1 + m) << (e + 2);
140
141 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
142 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
143 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
144 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
145 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
146 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
147 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
148 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
149
150 if (UNSTUFF_BITS(resp, 46, 1)) {
151 csd->erase_size = 1;
152 } else if (csd->write_blkbits >= 9) {
153 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
154 csd->erase_size <<= csd->write_blkbits - 9;
155 }
156
157 if (UNSTUFF_BITS(resp, 13, 1))
158 mmc_card_set_readonly(card);
159 break;
160 case 1:
161 /*
162 * This is a block-addressed SDHC or SDXC card. Most
163 * interesting fields are unused and have fixed
164 * values. To avoid getting tripped by buggy cards,
165 * we assume those fixed values ourselves.
166 */
167 mmc_card_set_blockaddr(card);
168
169 csd->taac_ns = 0; /* Unused */
170 csd->taac_clks = 0; /* Unused */
171
172 m = UNSTUFF_BITS(resp, 99, 4);
173 e = UNSTUFF_BITS(resp, 96, 3);
174 csd->max_dtr = tran_exp[e] * tran_mant[m];
175 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
176 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
177
178 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
179 if (csd->c_size >= 0xFFFF)
180 mmc_card_set_ext_capacity(card);
181
182 m = UNSTUFF_BITS(resp, 48, 22);
183 csd->capacity = (1 + m) << 10;
184
185 csd->read_blkbits = 9;
186 csd->read_partial = 0;
187 csd->write_misalign = 0;
188 csd->read_misalign = 0;
189 csd->r2w_factor = 4; /* Unused */
190 csd->write_blkbits = 9;
191 csd->write_partial = 0;
192 csd->erase_size = 1;
193
194 if (UNSTUFF_BITS(resp, 13, 1))
195 mmc_card_set_readonly(card);
196 break;
197 default:
198 pr_err("%s: unrecognised CSD structure version %d\n",
199 mmc_hostname(card->host), csd_struct);
200 return -EINVAL;
201 }
202
203 card->erase_size = csd->erase_size;
204
205 return 0;
206 }
207
208 /*
209 * Given a 64-bit response, decode to our card SCR structure.
210 */
mmc_decode_scr(struct mmc_card * card)211 static int mmc_decode_scr(struct mmc_card *card)
212 {
213 struct sd_scr *scr = &card->scr;
214 unsigned int scr_struct;
215 u32 resp[4];
216
217 resp[3] = card->raw_scr[1];
218 resp[2] = card->raw_scr[0];
219
220 scr_struct = UNSTUFF_BITS(resp, 60, 4);
221 if (scr_struct != 0) {
222 pr_err("%s: unrecognised SCR structure version %d\n",
223 mmc_hostname(card->host), scr_struct);
224 return -EINVAL;
225 }
226
227 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
228 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
229 if (scr->sda_vsn == SCR_SPEC_VER_2)
230 /* Check if Physical Layer Spec v3.0 is supported */
231 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
232
233 if (scr->sda_spec3) {
234 scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1);
235 scr->sda_specx = UNSTUFF_BITS(resp, 38, 4);
236 }
237
238 if (UNSTUFF_BITS(resp, 55, 1))
239 card->erased_byte = 0xFF;
240 else
241 card->erased_byte = 0x0;
242
243 if (scr->sda_spec4)
244 scr->cmds = UNSTUFF_BITS(resp, 32, 4);
245 else if (scr->sda_spec3)
246 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
247
248 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */
249 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
250 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
251 pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
252 return -EINVAL;
253 }
254
255 return 0;
256 }
257
258 /*
259 * Fetch and process SD Status register.
260 */
mmc_read_ssr(struct mmc_card * card)261 static int mmc_read_ssr(struct mmc_card *card)
262 {
263 unsigned int au, es, et, eo;
264 __be32 *raw_ssr;
265 u32 resp[4] = {};
266 u8 discard_support;
267 int i;
268
269 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
270 pr_warn("%s: card lacks mandatory SD Status function\n",
271 mmc_hostname(card->host));
272 return 0;
273 }
274
275 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
276 if (!raw_ssr)
277 return -ENOMEM;
278
279 if (mmc_app_sd_status(card, raw_ssr)) {
280 pr_warn("%s: problem reading SD Status register\n",
281 mmc_hostname(card->host));
282 kfree(raw_ssr);
283 return 0;
284 }
285
286 for (i = 0; i < 16; i++)
287 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
288
289 kfree(raw_ssr);
290
291 /*
292 * UNSTUFF_BITS only works with four u32s so we have to offset the
293 * bitfield positions accordingly.
294 */
295 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
296 if (au) {
297 if (au <= 9 || card->scr.sda_spec3) {
298 card->ssr.au = sd_au_size[au];
299 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
300 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
301 if (es && et) {
302 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
303 card->ssr.erase_timeout = (et * 1000) / es;
304 card->ssr.erase_offset = eo * 1000;
305 }
306 } else {
307 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
308 mmc_hostname(card->host));
309 }
310 }
311
312 /*
313 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set
314 */
315 resp[3] = card->raw_ssr[6];
316 discard_support = UNSTUFF_BITS(resp, 313 - 288, 1);
317 card->erase_arg = (card->scr.sda_specx && discard_support) ?
318 SD_DISCARD_ARG : SD_ERASE_ARG;
319
320 return 0;
321 }
322
323 /*
324 * Fetches and decodes switch information
325 */
mmc_read_switch(struct mmc_card * card)326 static int mmc_read_switch(struct mmc_card *card)
327 {
328 int err;
329 u8 *status;
330
331 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
332 return 0;
333
334 if (!(card->csd.cmdclass & CCC_SWITCH)) {
335 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
336 mmc_hostname(card->host));
337 return 0;
338 }
339
340 status = kmalloc(64, GFP_KERNEL);
341 if (!status)
342 return -ENOMEM;
343
344 /*
345 * Find out the card's support bits with a mode 0 operation.
346 * The argument does not matter, as the support bits do not
347 * change with the arguments.
348 */
349 err = mmc_sd_switch(card, 0, 0, 0, status);
350 if (err) {
351 /*
352 * If the host or the card can't do the switch,
353 * fail more gracefully.
354 */
355 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
356 goto out;
357
358 pr_warn("%s: problem reading Bus Speed modes\n",
359 mmc_hostname(card->host));
360 err = 0;
361
362 goto out;
363 }
364
365 if (status[13] & SD_MODE_HIGH_SPEED)
366 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
367
368 if (card->scr.sda_spec3) {
369 card->sw_caps.sd3_bus_mode = status[13];
370 /* Driver Strengths supported by the card */
371 card->sw_caps.sd3_drv_type = status[9];
372 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
373 }
374
375 out:
376 kfree(status);
377
378 return err;
379 }
380
381 /*
382 * Test if the card supports high-speed mode and, if so, switch to it.
383 */
mmc_sd_switch_hs(struct mmc_card * card)384 int mmc_sd_switch_hs(struct mmc_card *card)
385 {
386 int err;
387 u8 *status;
388
389 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
390 return 0;
391
392 if (!(card->csd.cmdclass & CCC_SWITCH))
393 return 0;
394
395 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
396 return 0;
397
398 if (card->sw_caps.hs_max_dtr == 0)
399 return 0;
400
401 status = kmalloc(64, GFP_KERNEL);
402 if (!status)
403 return -ENOMEM;
404
405 err = mmc_sd_switch(card, 1, 0, HIGH_SPEED_BUS_SPEED, status);
406 if (err)
407 goto out;
408
409 if ((status[16] & 0xF) != HIGH_SPEED_BUS_SPEED) {
410 pr_warn("%s: Problem switching card into high-speed mode!\n",
411 mmc_hostname(card->host));
412 err = 0;
413 } else {
414 err = 1;
415 }
416
417 out:
418 kfree(status);
419
420 return err;
421 }
422
sd_select_driver_type(struct mmc_card * card,u8 * status)423 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
424 {
425 int card_drv_type, drive_strength, drv_type;
426 int err;
427
428 card->drive_strength = 0;
429
430 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
431
432 drive_strength = mmc_select_drive_strength(card,
433 card->sw_caps.uhs_max_dtr,
434 card_drv_type, &drv_type);
435
436 if (drive_strength) {
437 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
438 if (err)
439 return err;
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 card->drive_strength = drive_strength;
446 }
447
448 if (drv_type)
449 mmc_set_driver_type(card->host, drv_type);
450
451 return 0;
452 }
453
sd_update_bus_speed_mode(struct mmc_card * card)454 static void sd_update_bus_speed_mode(struct mmc_card *card)
455 {
456 /*
457 * If the host doesn't support any of the UHS-I modes, fallback on
458 * default speed.
459 */
460 if (!mmc_host_uhs(card->host)) {
461 card->sd_bus_speed = 0;
462 return;
463 }
464
465 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
466 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
467 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
468 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
469 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
470 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
471 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
472 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
473 SD_MODE_UHS_SDR50)) {
474 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
475 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
476 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
477 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
478 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
479 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
480 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
481 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
482 SD_MODE_UHS_SDR12)) {
483 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
484 }
485 }
486
sd_set_bus_speed_mode(struct mmc_card * card,u8 * status)487 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
488 {
489 int err;
490 unsigned int timing = 0;
491
492 switch (card->sd_bus_speed) {
493 case UHS_SDR104_BUS_SPEED:
494 timing = MMC_TIMING_UHS_SDR104;
495 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
496 break;
497 case UHS_DDR50_BUS_SPEED:
498 timing = MMC_TIMING_UHS_DDR50;
499 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
500 break;
501 case UHS_SDR50_BUS_SPEED:
502 timing = MMC_TIMING_UHS_SDR50;
503 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
504 break;
505 case UHS_SDR25_BUS_SPEED:
506 timing = MMC_TIMING_UHS_SDR25;
507 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
508 break;
509 case UHS_SDR12_BUS_SPEED:
510 timing = MMC_TIMING_UHS_SDR12;
511 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
512 break;
513 default:
514 return 0;
515 }
516
517 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
518 if (err)
519 return err;
520
521 if ((status[16] & 0xF) != card->sd_bus_speed)
522 pr_warn("%s: Problem setting bus speed mode!\n",
523 mmc_hostname(card->host));
524 else {
525 mmc_set_timing(card->host, timing);
526 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
527 }
528
529 return 0;
530 }
531
532 /* Get host's max current setting at its current voltage */
sd_get_host_max_current(struct mmc_host * host)533 static u32 sd_get_host_max_current(struct mmc_host *host)
534 {
535 u32 voltage, max_current;
536
537 voltage = 1 << host->ios.vdd;
538 switch (voltage) {
539 case MMC_VDD_165_195:
540 max_current = host->max_current_180;
541 break;
542 case MMC_VDD_29_30:
543 case MMC_VDD_30_31:
544 max_current = host->max_current_300;
545 break;
546 case MMC_VDD_32_33:
547 case MMC_VDD_33_34:
548 max_current = host->max_current_330;
549 break;
550 default:
551 max_current = 0;
552 }
553
554 return max_current;
555 }
556
sd_set_current_limit(struct mmc_card * card,u8 * status)557 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
558 {
559 int current_limit = SD_SET_CURRENT_NO_CHANGE;
560 int err;
561 u32 max_current;
562
563 /*
564 * Current limit switch is only defined for SDR50, SDR104, and DDR50
565 * bus speed modes. For other bus speed modes, we do not change the
566 * current limit.
567 */
568 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
569 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
570 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
571 return 0;
572
573 /*
574 * Host has different current capabilities when operating at
575 * different voltages, so find out its max current first.
576 */
577 max_current = sd_get_host_max_current(card->host);
578
579 /*
580 * We only check host's capability here, if we set a limit that is
581 * higher than the card's maximum current, the card will be using its
582 * maximum current, e.g. if the card's maximum current is 300ma, and
583 * when we set current limit to 200ma, the card will draw 200ma, and
584 * when we set current limit to 400/600/800ma, the card will draw its
585 * maximum 300ma from the host.
586 *
587 * The above is incorrect: if we try to set a current limit that is
588 * not supported by the card, the card can rightfully error out the
589 * attempt, and remain at the default current limit. This results
590 * in a 300mA card being limited to 200mA even though the host
591 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
592 * an iMX6 host. --rmk
593 */
594 if (max_current >= 800 &&
595 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
596 current_limit = SD_SET_CURRENT_LIMIT_800;
597 else if (max_current >= 600 &&
598 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
599 current_limit = SD_SET_CURRENT_LIMIT_600;
600 else if (max_current >= 400 &&
601 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
602 current_limit = SD_SET_CURRENT_LIMIT_400;
603 else if (max_current >= 200 &&
604 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
605 current_limit = SD_SET_CURRENT_LIMIT_200;
606
607 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
608 err = mmc_sd_switch(card, 1, 3, current_limit, status);
609 if (err)
610 return err;
611
612 if (((status[15] >> 4) & 0x0F) != current_limit)
613 pr_warn("%s: Problem setting current limit!\n",
614 mmc_hostname(card->host));
615
616 }
617
618 return 0;
619 }
620
621 /*
622 * Determine if the card should tune or not.
623 */
mmc_sd_use_tuning(struct mmc_card * card)624 static bool mmc_sd_use_tuning(struct mmc_card *card)
625 {
626 /*
627 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
628 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
629 */
630 if (mmc_host_is_spi(card->host))
631 return false;
632
633 switch (card->host->ios.timing) {
634 case MMC_TIMING_UHS_SDR50:
635 case MMC_TIMING_UHS_SDR104:
636 return true;
637 case MMC_TIMING_UHS_DDR50:
638 return !mmc_card_no_uhs_ddr50_tuning(card);
639 }
640
641 return false;
642 }
643
644 /*
645 * UHS-I specific initialization procedure
646 */
mmc_sd_init_uhs_card(struct mmc_card * card)647 static int mmc_sd_init_uhs_card(struct mmc_card *card)
648 {
649 int err;
650 u8 *status;
651
652 if (!(card->csd.cmdclass & CCC_SWITCH))
653 return 0;
654
655 status = kmalloc(64, GFP_KERNEL);
656 if (!status)
657 return -ENOMEM;
658
659 /* Set 4-bit bus width */
660 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
661 if (err)
662 goto out;
663
664 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
665
666 /*
667 * Select the bus speed mode depending on host
668 * and card capability.
669 */
670 sd_update_bus_speed_mode(card);
671
672 /* Set the driver strength for the card */
673 err = sd_select_driver_type(card, status);
674 if (err)
675 goto out;
676
677 /* Set current limit for the card */
678 err = sd_set_current_limit(card, status);
679 if (err)
680 goto out;
681
682 /* Set bus speed mode of the card */
683 err = sd_set_bus_speed_mode(card, status);
684 if (err)
685 goto out;
686
687 if (mmc_sd_use_tuning(card)) {
688 err = mmc_execute_tuning(card);
689
690 /*
691 * As SD Specifications Part1 Physical Layer Specification
692 * Version 3.01 says, CMD19 tuning is available for unlocked
693 * cards in transfer state of 1.8V signaling mode. The small
694 * difference between v3.00 and 3.01 spec means that CMD19
695 * tuning is also available for DDR50 mode.
696 */
697 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
698 pr_warn("%s: ddr50 tuning failed\n",
699 mmc_hostname(card->host));
700 err = 0;
701 }
702 }
703
704 out:
705 kfree(status);
706
707 return err;
708 }
709
710 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
711 card->raw_cid[2], card->raw_cid[3]);
712 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
713 card->raw_csd[2], card->raw_csd[3]);
714 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
715 MMC_DEV_ATTR(ssr,
716 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
717 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
718 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
719 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
720 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
721 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
722 card->raw_ssr[15]);
723 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
724 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
725 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
726 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
727 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
728 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
729 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
730 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
731 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
732 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
733 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
734
735
mmc_dsr_show(struct device * dev,struct device_attribute * attr,char * buf)736 static ssize_t mmc_dsr_show(struct device *dev, struct device_attribute *attr,
737 char *buf)
738 {
739 struct mmc_card *card = mmc_dev_to_card(dev);
740 struct mmc_host *host = card->host;
741
742 if (card->csd.dsr_imp && host->dsr_req)
743 return sysfs_emit(buf, "0x%x\n", host->dsr);
744 /* return default DSR value */
745 return sysfs_emit(buf, "0x%x\n", 0x404);
746 }
747
748 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
749
750 MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
751 MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
752 MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev);
753
754 #define sdio_info_attr(num) \
755 static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
756 { \
757 struct mmc_card *card = mmc_dev_to_card(dev); \
758 \
759 if (num > card->num_info) \
760 return -ENODATA; \
761 if (!card->info[num - 1][0]) \
762 return 0; \
763 return sysfs_emit(buf, "%s\n", card->info[num - 1]); \
764 } \
765 static DEVICE_ATTR_RO(info##num)
766
767 sdio_info_attr(1);
768 sdio_info_attr(2);
769 sdio_info_attr(3);
770 sdio_info_attr(4);
771
772 static struct attribute *sd_std_attrs[] = {
773 &dev_attr_vendor.attr,
774 &dev_attr_device.attr,
775 &dev_attr_revision.attr,
776 &dev_attr_info1.attr,
777 &dev_attr_info2.attr,
778 &dev_attr_info3.attr,
779 &dev_attr_info4.attr,
780 &dev_attr_cid.attr,
781 &dev_attr_csd.attr,
782 &dev_attr_scr.attr,
783 &dev_attr_ssr.attr,
784 &dev_attr_date.attr,
785 &dev_attr_erase_size.attr,
786 &dev_attr_preferred_erase_size.attr,
787 &dev_attr_fwrev.attr,
788 &dev_attr_hwrev.attr,
789 &dev_attr_manfid.attr,
790 &dev_attr_name.attr,
791 &dev_attr_oemid.attr,
792 &dev_attr_serial.attr,
793 &dev_attr_ocr.attr,
794 &dev_attr_rca.attr,
795 &dev_attr_dsr.attr,
796 NULL,
797 };
798
sd_std_is_visible(struct kobject * kobj,struct attribute * attr,int index)799 static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr,
800 int index)
801 {
802 struct device *dev = kobj_to_dev(kobj);
803 struct mmc_card *card = mmc_dev_to_card(dev);
804
805 /* CIS vendor and device ids, revision and info string are available only for Combo cards */
806 if ((attr == &dev_attr_vendor.attr ||
807 attr == &dev_attr_device.attr ||
808 attr == &dev_attr_revision.attr ||
809 attr == &dev_attr_info1.attr ||
810 attr == &dev_attr_info2.attr ||
811 attr == &dev_attr_info3.attr ||
812 attr == &dev_attr_info4.attr
813 ) &&!mmc_card_sd_combo(card))
814 return 0;
815
816 return attr->mode;
817 }
818
819 static const struct attribute_group sd_std_group = {
820 .attrs = sd_std_attrs,
821 .is_visible = sd_std_is_visible,
822 };
823 __ATTRIBUTE_GROUPS(sd_std);
824
825 struct device_type sd_type = {
826 .groups = sd_std_groups,
827 };
828
829 /*
830 * Fetch CID from card.
831 */
mmc_sd_get_cid(struct mmc_host * host,u32 ocr,u32 * cid,u32 * rocr)832 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
833 {
834 int err;
835 u32 max_current;
836 int retries = 10;
837 u32 pocr = ocr;
838
839 try_again:
840 if (!retries) {
841 ocr &= ~SD_OCR_S18R;
842 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
843 }
844
845 /*
846 * Since we're changing the OCR value, we seem to
847 * need to tell some cards to go back to the idle
848 * state. We wait 1ms to give cards time to
849 * respond.
850 */
851 mmc_go_idle(host);
852
853 /*
854 * If SD_SEND_IF_COND indicates an SD 2.0
855 * compliant card and we should set bit 30
856 * of the ocr to indicate that we can handle
857 * block-addressed SDHC cards.
858 */
859 err = mmc_send_if_cond(host, ocr);
860 if (!err)
861 ocr |= SD_OCR_CCS;
862
863 /*
864 * If the host supports one of UHS-I modes, request the card
865 * to switch to 1.8V signaling level. If the card has failed
866 * repeatedly to switch however, skip this.
867 */
868 if (retries && mmc_host_uhs(host))
869 ocr |= SD_OCR_S18R;
870
871 /*
872 * If the host can supply more than 150mA at current voltage,
873 * XPC should be set to 1.
874 */
875 max_current = sd_get_host_max_current(host);
876 if (max_current > 150)
877 ocr |= SD_OCR_XPC;
878
879 err = mmc_send_app_op_cond(host, ocr, rocr);
880 if (err)
881 return err;
882
883 /*
884 * In case the S18A bit is set in the response, let's start the signal
885 * voltage switch procedure. SPI mode doesn't support CMD11.
886 * Note that, according to the spec, the S18A bit is not valid unless
887 * the CCS bit is set as well. We deliberately deviate from the spec in
888 * regards to this, which allows UHS-I to be supported for SDSC cards.
889 */
890 if (!mmc_host_is_spi(host) && (ocr & SD_OCR_S18R) &&
891 rocr && (*rocr & SD_ROCR_S18A)) {
892 err = mmc_set_uhs_voltage(host, pocr);
893 if (err == -EAGAIN) {
894 retries--;
895 goto try_again;
896 } else if (err) {
897 retries = 0;
898 goto try_again;
899 }
900 }
901
902 err = mmc_send_cid(host, cid);
903 return err;
904 }
905
mmc_sd_get_csd(struct mmc_card * card)906 int mmc_sd_get_csd(struct mmc_card *card)
907 {
908 int err;
909
910 /*
911 * Fetch CSD from card.
912 */
913 err = mmc_send_csd(card, card->raw_csd);
914 if (err)
915 return err;
916
917 err = mmc_decode_csd(card);
918 if (err)
919 return err;
920
921 return 0;
922 }
923
mmc_sd_get_ro(struct mmc_host * host)924 static int mmc_sd_get_ro(struct mmc_host *host)
925 {
926 int ro;
927
928 /*
929 * Some systems don't feature a write-protect pin and don't need one.
930 * E.g. because they only have micro-SD card slot. For those systems
931 * assume that the SD card is always read-write.
932 */
933 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
934 return 0;
935
936 if (!host->ops->get_ro)
937 return -1;
938
939 ro = host->ops->get_ro(host);
940
941 return ro;
942 }
943
mmc_sd_setup_card(struct mmc_host * host,struct mmc_card * card,bool reinit)944 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
945 bool reinit)
946 {
947 int err;
948
949 if (!reinit) {
950 /*
951 * Fetch SCR from card.
952 */
953 err = mmc_app_send_scr(card);
954 if (err)
955 return err;
956
957 err = mmc_decode_scr(card);
958 if (err)
959 return err;
960
961 /*
962 * Fetch and process SD Status register.
963 */
964 err = mmc_read_ssr(card);
965 if (err)
966 return err;
967
968 /* Erase init depends on CSD and SSR */
969 mmc_init_erase(card);
970 }
971
972 /*
973 * Fetch switch information from card. Note, sd3_bus_mode can change if
974 * voltage switch outcome changes, so do this always.
975 */
976 err = mmc_read_switch(card);
977 if (err)
978 return err;
979
980 /*
981 * For SPI, enable CRC as appropriate.
982 * This CRC enable is located AFTER the reading of the
983 * card registers because some SDHC cards are not able
984 * to provide valid CRCs for non-512-byte blocks.
985 */
986 if (mmc_host_is_spi(host)) {
987 err = mmc_spi_set_crc(host, use_spi_crc);
988 if (err)
989 return err;
990 }
991
992 /*
993 * Check if read-only switch is active.
994 */
995 if (!reinit) {
996 int ro = mmc_sd_get_ro(host);
997
998 if (ro < 0) {
999 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
1000 mmc_hostname(host));
1001 } else if (ro > 0) {
1002 mmc_card_set_readonly(card);
1003 }
1004 }
1005
1006 return 0;
1007 }
1008
mmc_sd_get_max_clock(struct mmc_card * card)1009 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
1010 {
1011 unsigned max_dtr = (unsigned int)-1;
1012
1013 if (mmc_card_hs(card)) {
1014 if (max_dtr > card->sw_caps.hs_max_dtr)
1015 max_dtr = card->sw_caps.hs_max_dtr;
1016 } else if (max_dtr > card->csd.max_dtr) {
1017 max_dtr = card->csd.max_dtr;
1018 }
1019
1020 return max_dtr;
1021 }
1022
mmc_sd_card_using_v18(struct mmc_card * card)1023 static bool mmc_sd_card_using_v18(struct mmc_card *card)
1024 {
1025 /*
1026 * According to the SD spec., the Bus Speed Mode (function group 1) bits
1027 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus
1028 * they can be used to determine if the card has already switched to
1029 * 1.8V signaling.
1030 */
1031 return card->sw_caps.sd3_bus_mode &
1032 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50);
1033 }
1034
sd_write_ext_reg(struct mmc_card * card,u8 fno,u8 page,u16 offset,u8 reg_data)1035 static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, u16 offset,
1036 u8 reg_data)
1037 {
1038 struct mmc_host *host = card->host;
1039 struct mmc_request mrq = {};
1040 struct mmc_command cmd = {};
1041 struct mmc_data data = {};
1042 struct scatterlist sg;
1043 u8 *reg_buf;
1044
1045 reg_buf = kzalloc(512, GFP_KERNEL);
1046 if (!reg_buf)
1047 return -ENOMEM;
1048
1049 mrq.cmd = &cmd;
1050 mrq.data = &data;
1051
1052 /*
1053 * Arguments of CMD49:
1054 * [31:31] MIO (0 = memory).
1055 * [30:27] FNO (function number).
1056 * [26:26] MW - mask write mode (0 = disable).
1057 * [25:18] page number.
1058 * [17:9] offset address.
1059 * [8:0] length (0 = 1 byte).
1060 */
1061 cmd.arg = fno << 27 | page << 18 | offset << 9;
1062
1063 /* The first byte in the buffer is the data to be written. */
1064 reg_buf[0] = reg_data;
1065
1066 data.flags = MMC_DATA_WRITE;
1067 data.blksz = 512;
1068 data.blocks = 1;
1069 data.sg = &sg;
1070 data.sg_len = 1;
1071 sg_init_one(&sg, reg_buf, 512);
1072
1073 cmd.opcode = SD_WRITE_EXTR_SINGLE;
1074 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1075
1076 mmc_set_data_timeout(&data, card);
1077 mmc_wait_for_req(host, &mrq);
1078
1079 kfree(reg_buf);
1080
1081 /*
1082 * Note that, the SD card is allowed to signal busy on DAT0 up to 1s
1083 * after the CMD49. Although, let's leave this to be managed by the
1084 * caller.
1085 */
1086
1087 if (cmd.error)
1088 return cmd.error;
1089 if (data.error)
1090 return data.error;
1091
1092 return 0;
1093 }
1094
sd_read_ext_reg(struct mmc_card * card,u8 fno,u8 page,u16 offset,u16 len,u8 * reg_buf)1095 static int sd_read_ext_reg(struct mmc_card *card, u8 fno, u8 page,
1096 u16 offset, u16 len, u8 *reg_buf)
1097 {
1098 u32 cmd_args;
1099
1100 /*
1101 * Command arguments of CMD48:
1102 * [31:31] MIO (0 = memory).
1103 * [30:27] FNO (function number).
1104 * [26:26] reserved (0).
1105 * [25:18] page number.
1106 * [17:9] offset address.
1107 * [8:0] length (0 = 1 byte, 1ff = 512 bytes).
1108 */
1109 cmd_args = fno << 27 | page << 18 | offset << 9 | (len -1);
1110
1111 return mmc_send_adtc_data(card, card->host, SD_READ_EXTR_SINGLE,
1112 cmd_args, reg_buf, 512);
1113 }
1114
sd_parse_ext_reg_power(struct mmc_card * card,u8 fno,u8 page,u16 offset)1115 static int sd_parse_ext_reg_power(struct mmc_card *card, u8 fno, u8 page,
1116 u16 offset)
1117 {
1118 int err;
1119 u8 *reg_buf;
1120
1121 reg_buf = kzalloc(512, GFP_KERNEL);
1122 if (!reg_buf)
1123 return -ENOMEM;
1124
1125 /* Read the extension register for power management function. */
1126 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf);
1127 if (err) {
1128 pr_warn("%s: error %d reading PM func of ext reg\n",
1129 mmc_hostname(card->host), err);
1130 goto out;
1131 }
1132
1133 /* PM revision consists of 4 bits. */
1134 card->ext_power.rev = reg_buf[0] & 0xf;
1135
1136 /* Power Off Notification support at bit 4. */
1137 if ((reg_buf[1] & BIT(4)) && !mmc_card_broken_sd_poweroff_notify(card))
1138 card->ext_power.feature_support |= SD_EXT_POWER_OFF_NOTIFY;
1139
1140 /* Power Sustenance support at bit 5. */
1141 if (reg_buf[1] & BIT(5))
1142 card->ext_power.feature_support |= SD_EXT_POWER_SUSTENANCE;
1143
1144 /* Power Down Mode support at bit 6. */
1145 if (reg_buf[1] & BIT(6))
1146 card->ext_power.feature_support |= SD_EXT_POWER_DOWN_MODE;
1147
1148 card->ext_power.fno = fno;
1149 card->ext_power.page = page;
1150 card->ext_power.offset = offset;
1151
1152 out:
1153 kfree(reg_buf);
1154 return err;
1155 }
1156
sd_parse_ext_reg_perf(struct mmc_card * card,u8 fno,u8 page,u16 offset)1157 static int sd_parse_ext_reg_perf(struct mmc_card *card, u8 fno, u8 page,
1158 u16 offset)
1159 {
1160 int err;
1161 u8 *reg_buf;
1162
1163 reg_buf = kzalloc(512, GFP_KERNEL);
1164 if (!reg_buf)
1165 return -ENOMEM;
1166
1167 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf);
1168 if (err) {
1169 pr_warn("%s: error %d reading PERF func of ext reg\n",
1170 mmc_hostname(card->host), err);
1171 goto out;
1172 }
1173
1174 /* PERF revision. */
1175 card->ext_perf.rev = reg_buf[0];
1176
1177 /* FX_EVENT support at bit 0. */
1178 if (reg_buf[1] & BIT(0))
1179 card->ext_perf.feature_support |= SD_EXT_PERF_FX_EVENT;
1180
1181 /* Card initiated self-maintenance support at bit 0. */
1182 if (reg_buf[2] & BIT(0))
1183 card->ext_perf.feature_support |= SD_EXT_PERF_CARD_MAINT;
1184
1185 /* Host initiated self-maintenance support at bit 1. */
1186 if (reg_buf[2] & BIT(1))
1187 card->ext_perf.feature_support |= SD_EXT_PERF_HOST_MAINT;
1188
1189 /* Cache support at bit 0. */
1190 if ((reg_buf[4] & BIT(0)) && !mmc_card_broken_sd_cache(card))
1191 card->ext_perf.feature_support |= SD_EXT_PERF_CACHE;
1192
1193 /* Command queue support indicated via queue depth bits (0 to 4). */
1194 if (reg_buf[6] & 0x1f)
1195 card->ext_perf.feature_support |= SD_EXT_PERF_CMD_QUEUE;
1196
1197 card->ext_perf.fno = fno;
1198 card->ext_perf.page = page;
1199 card->ext_perf.offset = offset;
1200
1201 out:
1202 kfree(reg_buf);
1203 return err;
1204 }
1205
sd_parse_ext_reg(struct mmc_card * card,u8 * gen_info_buf,u16 * next_ext_addr)1206 static int sd_parse_ext_reg(struct mmc_card *card, u8 *gen_info_buf,
1207 u16 *next_ext_addr)
1208 {
1209 u8 num_regs, fno, page;
1210 u16 sfc, offset, ext = *next_ext_addr;
1211 u32 reg_addr;
1212
1213 /*
1214 * Parse only one register set per extension, as that is sufficient to
1215 * support the standard functions. This means another 48 bytes in the
1216 * buffer must be available.
1217 */
1218 if (ext + 48 > 512)
1219 return -EFAULT;
1220
1221 /* Standard Function Code */
1222 memcpy(&sfc, &gen_info_buf[ext], 2);
1223
1224 /* Address to the next extension. */
1225 memcpy(next_ext_addr, &gen_info_buf[ext + 40], 2);
1226
1227 /* Number of registers for this extension. */
1228 num_regs = gen_info_buf[ext + 42];
1229
1230 /* We support only one register per extension. */
1231 if (num_regs != 1)
1232 return 0;
1233
1234 /* Extension register address. */
1235 memcpy(®_addr, &gen_info_buf[ext + 44], 4);
1236
1237 /* 9 bits (0 to 8) contains the offset address. */
1238 offset = reg_addr & 0x1ff;
1239
1240 /* 8 bits (9 to 16) contains the page number. */
1241 page = reg_addr >> 9 & 0xff ;
1242
1243 /* 4 bits (18 to 21) contains the function number. */
1244 fno = reg_addr >> 18 & 0xf;
1245
1246 /* Standard Function Code for power management. */
1247 if (sfc == 0x1)
1248 return sd_parse_ext_reg_power(card, fno, page, offset);
1249
1250 /* Standard Function Code for performance enhancement. */
1251 if (sfc == 0x2)
1252 return sd_parse_ext_reg_perf(card, fno, page, offset);
1253
1254 return 0;
1255 }
1256
sd_read_ext_regs(struct mmc_card * card)1257 static int sd_read_ext_regs(struct mmc_card *card)
1258 {
1259 int err, i;
1260 u8 num_ext, *gen_info_buf;
1261 u16 rev, len, next_ext_addr;
1262
1263 if (mmc_host_is_spi(card->host))
1264 return 0;
1265
1266 if (!(card->scr.cmds & SD_SCR_CMD48_SUPPORT))
1267 return 0;
1268
1269 gen_info_buf = kzalloc(512, GFP_KERNEL);
1270 if (!gen_info_buf)
1271 return -ENOMEM;
1272
1273 /*
1274 * Read 512 bytes of general info, which is found at function number 0,
1275 * at page 0 and with no offset.
1276 */
1277 err = sd_read_ext_reg(card, 0, 0, 0, 512, gen_info_buf);
1278 if (err) {
1279 pr_err("%s: error %d reading general info of SD ext reg\n",
1280 mmc_hostname(card->host), err);
1281 goto out;
1282 }
1283
1284 /* General info structure revision. */
1285 memcpy(&rev, &gen_info_buf[0], 2);
1286
1287 /* Length of general info in bytes. */
1288 memcpy(&len, &gen_info_buf[2], 2);
1289
1290 /* Number of extensions to be find. */
1291 num_ext = gen_info_buf[4];
1292
1293 /*
1294 * We only support revision 0 and limit it to 512 bytes for simplicity.
1295 * No matter what, let's return zero to allow us to continue using the
1296 * card, even if we can't support the features from the SD function
1297 * extensions registers.
1298 */
1299 if (rev != 0 || len > 512) {
1300 pr_warn("%s: non-supported SD ext reg layout\n",
1301 mmc_hostname(card->host));
1302 goto out;
1303 }
1304
1305 /*
1306 * Parse the extension registers. The first extension should start
1307 * immediately after the general info header (16 bytes).
1308 */
1309 next_ext_addr = 16;
1310 for (i = 0; i < num_ext; i++) {
1311 err = sd_parse_ext_reg(card, gen_info_buf, &next_ext_addr);
1312 if (err) {
1313 pr_err("%s: error %d parsing SD ext reg\n",
1314 mmc_hostname(card->host), err);
1315 goto out;
1316 }
1317 }
1318
1319 out:
1320 kfree(gen_info_buf);
1321 return err;
1322 }
1323
sd_cache_enabled(struct mmc_host * host)1324 static bool sd_cache_enabled(struct mmc_host *host)
1325 {
1326 return host->card->ext_perf.feature_enabled & SD_EXT_PERF_CACHE;
1327 }
1328
sd_flush_cache(struct mmc_host * host)1329 static int sd_flush_cache(struct mmc_host *host)
1330 {
1331 struct mmc_card *card = host->card;
1332 u8 *reg_buf, fno, page;
1333 u16 offset;
1334 int err;
1335
1336 if (!sd_cache_enabled(host))
1337 return 0;
1338
1339 reg_buf = kzalloc(512, GFP_KERNEL);
1340 if (!reg_buf)
1341 return -ENOMEM;
1342
1343 /*
1344 * Set Flush Cache at bit 0 in the performance enhancement register at
1345 * 261 bytes offset.
1346 */
1347 fno = card->ext_perf.fno;
1348 page = card->ext_perf.page;
1349 offset = card->ext_perf.offset + 261;
1350
1351 err = sd_write_ext_reg(card, fno, page, offset, BIT(0));
1352 if (err) {
1353 pr_warn("%s: error %d writing Cache Flush bit\n",
1354 mmc_hostname(host), err);
1355 goto out;
1356 }
1357
1358 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1359 MMC_BUSY_EXTR_SINGLE);
1360 if (err)
1361 goto out;
1362
1363 /*
1364 * Read the Flush Cache bit. The card shall reset it, to confirm that
1365 * it's has completed the flushing of the cache.
1366 */
1367 err = sd_read_ext_reg(card, fno, page, offset, 1, reg_buf);
1368 if (err) {
1369 pr_warn("%s: error %d reading Cache Flush bit\n",
1370 mmc_hostname(host), err);
1371 goto out;
1372 }
1373
1374 if (reg_buf[0] & BIT(0))
1375 err = -ETIMEDOUT;
1376 out:
1377 kfree(reg_buf);
1378 return err;
1379 }
1380
sd_enable_cache(struct mmc_card * card)1381 static int sd_enable_cache(struct mmc_card *card)
1382 {
1383 u8 *reg_buf;
1384 int err;
1385
1386 card->ext_perf.feature_enabled &= ~SD_EXT_PERF_CACHE;
1387
1388 reg_buf = kzalloc(512, GFP_KERNEL);
1389 if (!reg_buf)
1390 return -ENOMEM;
1391
1392 /*
1393 * Set Cache Enable at bit 0 in the performance enhancement register at
1394 * 260 bytes offset.
1395 */
1396 err = sd_write_ext_reg(card, card->ext_perf.fno, card->ext_perf.page,
1397 card->ext_perf.offset + 260, BIT(0));
1398 if (err) {
1399 pr_warn("%s: error %d writing Cache Enable bit\n",
1400 mmc_hostname(card->host), err);
1401 goto out;
1402 }
1403
1404 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1405 MMC_BUSY_EXTR_SINGLE);
1406 if (!err)
1407 card->ext_perf.feature_enabled |= SD_EXT_PERF_CACHE;
1408
1409 out:
1410 kfree(reg_buf);
1411 return err;
1412 }
1413
1414 /*
1415 * Handle the detection and initialisation of a card.
1416 *
1417 * In the case of a resume, "oldcard" will contain the card
1418 * we're trying to reinitialise.
1419 */
mmc_sd_init_card(struct mmc_host * host,u32 ocr,struct mmc_card * oldcard)1420 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
1421 struct mmc_card *oldcard)
1422 {
1423 struct mmc_card *card;
1424 int err;
1425 u32 cid[4];
1426 u32 rocr = 0;
1427 bool v18_fixup_failed = false;
1428
1429 WARN_ON(!host->claimed);
1430 retry:
1431 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
1432 if (err)
1433 return err;
1434
1435 if (oldcard) {
1436 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1437 pr_debug("%s: Perhaps the card was replaced\n",
1438 mmc_hostname(host));
1439 return -ENOENT;
1440 }
1441
1442 card = oldcard;
1443 } else {
1444 /*
1445 * Allocate card structure.
1446 */
1447 card = mmc_alloc_card(host, &sd_type);
1448 if (IS_ERR(card))
1449 return PTR_ERR(card);
1450
1451 card->ocr = ocr;
1452 card->type = MMC_TYPE_SD;
1453 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1454 }
1455
1456 /*
1457 * Call the optional HC's init_card function to handle quirks.
1458 */
1459 if (host->ops->init_card)
1460 host->ops->init_card(host, card);
1461
1462 /*
1463 * For native busses: get card RCA and quit open drain mode.
1464 */
1465 if (!mmc_host_is_spi(host)) {
1466 err = mmc_send_relative_addr(host, &card->rca);
1467 if (err)
1468 goto free_card;
1469 }
1470
1471 if (!oldcard) {
1472 err = mmc_sd_get_csd(card);
1473 if (err)
1474 goto free_card;
1475
1476 mmc_decode_cid(card);
1477 }
1478
1479 /*
1480 * handling only for cards supporting DSR and hosts requesting
1481 * DSR configuration
1482 */
1483 if (card->csd.dsr_imp && host->dsr_req)
1484 mmc_set_dsr(host);
1485
1486 /*
1487 * Select card, as all following commands rely on that.
1488 */
1489 if (!mmc_host_is_spi(host)) {
1490 err = mmc_select_card(card);
1491 if (err)
1492 goto free_card;
1493 }
1494
1495 /* Apply quirks prior to card setup */
1496 mmc_fixup_device(card, mmc_sd_fixups);
1497
1498 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1499 if (err)
1500 goto free_card;
1501
1502 /*
1503 * If the card has not been power cycled, it may still be using 1.8V
1504 * signaling. Detect that situation and try to initialize a UHS-I (1.8V)
1505 * transfer mode.
1506 */
1507 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
1508 mmc_sd_card_using_v18(card) &&
1509 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
1510 if (mmc_host_set_uhs_voltage(host) ||
1511 mmc_sd_init_uhs_card(card)) {
1512 v18_fixup_failed = true;
1513 mmc_power_cycle(host, ocr);
1514 if (!oldcard)
1515 mmc_remove_card(card);
1516 goto retry;
1517 }
1518 goto cont;
1519 }
1520
1521 /* Initialization sequence for UHS-I cards */
1522 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {
1523 err = mmc_sd_init_uhs_card(card);
1524 if (err)
1525 goto free_card;
1526 } else {
1527 /*
1528 * Attempt to change to high-speed (if supported)
1529 */
1530 err = mmc_sd_switch_hs(card);
1531 if (err > 0)
1532 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1533 else if (err)
1534 goto free_card;
1535
1536 /*
1537 * Set bus speed.
1538 */
1539 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1540
1541 if (host->ios.timing == MMC_TIMING_SD_HS &&
1542 host->ops->prepare_sd_hs_tuning) {
1543 err = host->ops->prepare_sd_hs_tuning(host, card);
1544 if (err)
1545 goto free_card;
1546 }
1547
1548 /*
1549 * Switch to wider bus (if supported).
1550 */
1551 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1552 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1553 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1554 if (err)
1555 goto free_card;
1556
1557 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1558 }
1559
1560 if (host->ios.timing == MMC_TIMING_SD_HS &&
1561 host->ops->execute_sd_hs_tuning) {
1562 err = host->ops->execute_sd_hs_tuning(host, card);
1563 if (err)
1564 goto free_card;
1565 }
1566 }
1567 cont:
1568 if (!oldcard) {
1569 /* Read/parse the extension registers. */
1570 err = sd_read_ext_regs(card);
1571 if (err)
1572 goto free_card;
1573 }
1574
1575 /* Enable internal SD cache if supported. */
1576 if (card->ext_perf.feature_support & SD_EXT_PERF_CACHE) {
1577 err = sd_enable_cache(card);
1578 if (err)
1579 goto free_card;
1580 }
1581
1582 if (host->cqe_ops && !host->cqe_enabled) {
1583 err = host->cqe_ops->cqe_enable(host, card);
1584 if (!err) {
1585 host->cqe_enabled = true;
1586 host->hsq_enabled = true;
1587 pr_info("%s: Host Software Queue enabled\n",
1588 mmc_hostname(host));
1589 }
1590 }
1591
1592 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1593 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1594 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1595 mmc_hostname(host));
1596 err = -EINVAL;
1597 goto free_card;
1598 }
1599
1600 host->card = card;
1601 return 0;
1602
1603 free_card:
1604 if (!oldcard)
1605 mmc_remove_card(card);
1606
1607 return err;
1608 }
1609
1610 /*
1611 * Host is being removed. Free up the current card.
1612 */
mmc_sd_remove(struct mmc_host * host)1613 static void mmc_sd_remove(struct mmc_host *host)
1614 {
1615 mmc_remove_card(host->card);
1616 host->card = NULL;
1617 }
1618
1619 /*
1620 * Card detection - card is alive.
1621 */
mmc_sd_alive(struct mmc_host * host)1622 static int mmc_sd_alive(struct mmc_host *host)
1623 {
1624 return mmc_send_status(host->card, NULL);
1625 }
1626
1627 /*
1628 * Card detection callback from host.
1629 */
mmc_sd_detect(struct mmc_host * host)1630 static void mmc_sd_detect(struct mmc_host *host)
1631 {
1632 int err;
1633
1634 mmc_get_card(host->card, NULL);
1635
1636 /*
1637 * Just check if our card has been removed.
1638 */
1639 err = _mmc_detect_card_removed(host);
1640
1641 mmc_put_card(host->card, NULL);
1642
1643 if (err) {
1644 mmc_sd_remove(host);
1645
1646 mmc_claim_host(host);
1647 mmc_detach_bus(host);
1648 mmc_power_off(host);
1649 mmc_release_host(host);
1650 }
1651 }
1652
sd_can_poweroff_notify(struct mmc_card * card)1653 static int sd_can_poweroff_notify(struct mmc_card *card)
1654 {
1655 return card->ext_power.feature_support & SD_EXT_POWER_OFF_NOTIFY;
1656 }
1657
sd_busy_poweroff_notify_cb(void * cb_data,bool * busy)1658 static int sd_busy_poweroff_notify_cb(void *cb_data, bool *busy)
1659 {
1660 struct sd_busy_data *data = cb_data;
1661 struct mmc_card *card = data->card;
1662 int err;
1663
1664 /*
1665 * Read the status register for the power management function. It's at
1666 * one byte offset and is one byte long. The Power Off Notification
1667 * Ready is bit 0.
1668 */
1669 err = sd_read_ext_reg(card, card->ext_power.fno, card->ext_power.page,
1670 card->ext_power.offset + 1, 1, data->reg_buf);
1671 if (err) {
1672 pr_warn("%s: error %d reading status reg of PM func\n",
1673 mmc_hostname(card->host), err);
1674 return err;
1675 }
1676
1677 *busy = !(data->reg_buf[0] & BIT(0));
1678 return 0;
1679 }
1680
sd_poweroff_notify(struct mmc_card * card)1681 static int sd_poweroff_notify(struct mmc_card *card)
1682 {
1683 struct sd_busy_data cb_data;
1684 u8 *reg_buf;
1685 int err;
1686
1687 reg_buf = kzalloc(512, GFP_KERNEL);
1688 if (!reg_buf)
1689 return -ENOMEM;
1690
1691 /*
1692 * Set the Power Off Notification bit in the power management settings
1693 * register at 2 bytes offset.
1694 */
1695 err = sd_write_ext_reg(card, card->ext_power.fno, card->ext_power.page,
1696 card->ext_power.offset + 2, BIT(0));
1697 if (err) {
1698 pr_warn("%s: error %d writing Power Off Notify bit\n",
1699 mmc_hostname(card->host), err);
1700 goto out;
1701 }
1702
1703 /* Find out when the command is completed. */
1704 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1705 MMC_BUSY_EXTR_SINGLE);
1706 if (err)
1707 goto out;
1708
1709 cb_data.card = card;
1710 cb_data.reg_buf = reg_buf;
1711 err = __mmc_poll_for_busy(card->host, 0, SD_POWEROFF_NOTIFY_TIMEOUT_MS,
1712 &sd_busy_poweroff_notify_cb, &cb_data);
1713
1714 out:
1715 kfree(reg_buf);
1716 return err;
1717 }
1718
_mmc_sd_suspend(struct mmc_host * host)1719 static int _mmc_sd_suspend(struct mmc_host *host)
1720 {
1721 struct mmc_card *card = host->card;
1722 int err = 0;
1723
1724 mmc_claim_host(host);
1725
1726 if (mmc_card_suspended(card))
1727 goto out;
1728
1729 if (sd_can_poweroff_notify(card))
1730 err = sd_poweroff_notify(card);
1731 else if (!mmc_host_is_spi(host))
1732 err = mmc_deselect_cards(host);
1733
1734 if (!err) {
1735 mmc_power_off(host);
1736 mmc_card_set_suspended(card);
1737 }
1738
1739 out:
1740 mmc_release_host(host);
1741 return err;
1742 }
1743
1744 /*
1745 * Callback for suspend
1746 */
mmc_sd_suspend(struct mmc_host * host)1747 static int mmc_sd_suspend(struct mmc_host *host)
1748 {
1749 int err;
1750
1751 err = _mmc_sd_suspend(host);
1752 if (!err) {
1753 pm_runtime_disable(&host->card->dev);
1754 pm_runtime_set_suspended(&host->card->dev);
1755 }
1756
1757 return err;
1758 }
1759
1760 /*
1761 * This function tries to determine if the same card is still present
1762 * and, if so, restore all state to it.
1763 */
_mmc_sd_resume(struct mmc_host * host)1764 static int _mmc_sd_resume(struct mmc_host *host)
1765 {
1766 int err = 0;
1767
1768 mmc_claim_host(host);
1769
1770 if (!mmc_card_suspended(host->card))
1771 goto out;
1772
1773 mmc_power_up(host, host->card->ocr);
1774 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1775 mmc_card_clr_suspended(host->card);
1776
1777 out:
1778 mmc_release_host(host);
1779 return err;
1780 }
1781
1782 /*
1783 * Callback for resume
1784 */
mmc_sd_resume(struct mmc_host * host)1785 static int mmc_sd_resume(struct mmc_host *host)
1786 {
1787 pm_runtime_enable(&host->card->dev);
1788 return 0;
1789 }
1790
1791 /*
1792 * Callback for runtime_suspend.
1793 */
mmc_sd_runtime_suspend(struct mmc_host * host)1794 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1795 {
1796 int err;
1797
1798 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1799 return 0;
1800
1801 err = _mmc_sd_suspend(host);
1802 if (err)
1803 pr_err("%s: error %d doing aggressive suspend\n",
1804 mmc_hostname(host), err);
1805
1806 return err;
1807 }
1808
1809 /*
1810 * Callback for runtime_resume.
1811 */
mmc_sd_runtime_resume(struct mmc_host * host)1812 static int mmc_sd_runtime_resume(struct mmc_host *host)
1813 {
1814 int err;
1815
1816 err = _mmc_sd_resume(host);
1817 if (err && err != -ENOMEDIUM)
1818 pr_err("%s: error %d doing runtime resume\n",
1819 mmc_hostname(host), err);
1820
1821 return 0;
1822 }
1823
mmc_sd_hw_reset(struct mmc_host * host)1824 static int mmc_sd_hw_reset(struct mmc_host *host)
1825 {
1826 mmc_power_cycle(host, host->card->ocr);
1827 return mmc_sd_init_card(host, host->card->ocr, host->card);
1828 }
1829
1830 static const struct mmc_bus_ops mmc_sd_ops = {
1831 .remove = mmc_sd_remove,
1832 .detect = mmc_sd_detect,
1833 .runtime_suspend = mmc_sd_runtime_suspend,
1834 .runtime_resume = mmc_sd_runtime_resume,
1835 .suspend = mmc_sd_suspend,
1836 .resume = mmc_sd_resume,
1837 .alive = mmc_sd_alive,
1838 .shutdown = mmc_sd_suspend,
1839 .hw_reset = mmc_sd_hw_reset,
1840 .cache_enabled = sd_cache_enabled,
1841 .flush_cache = sd_flush_cache,
1842 };
1843
1844 /*
1845 * Starting point for SD card init.
1846 */
mmc_attach_sd(struct mmc_host * host)1847 int mmc_attach_sd(struct mmc_host *host)
1848 {
1849 int err;
1850 u32 ocr, rocr;
1851
1852 WARN_ON(!host->claimed);
1853
1854 err = mmc_send_app_op_cond(host, 0, &ocr);
1855 if (err)
1856 return err;
1857
1858 mmc_attach_bus(host, &mmc_sd_ops);
1859 if (host->ocr_avail_sd)
1860 host->ocr_avail = host->ocr_avail_sd;
1861
1862 /*
1863 * We need to get OCR a different way for SPI.
1864 */
1865 if (mmc_host_is_spi(host)) {
1866 mmc_go_idle(host);
1867
1868 err = mmc_spi_read_ocr(host, 0, &ocr);
1869 if (err)
1870 goto err;
1871 }
1872
1873 /*
1874 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1875 * these bits as being in-valid and especially also bit7.
1876 */
1877 ocr &= ~0x7FFF;
1878
1879 rocr = mmc_select_voltage(host, ocr);
1880
1881 /*
1882 * Can we support the voltage(s) of the card(s)?
1883 */
1884 if (!rocr) {
1885 err = -EINVAL;
1886 goto err;
1887 }
1888
1889 /*
1890 * Detect and init the card.
1891 */
1892 err = mmc_sd_init_card(host, rocr, NULL);
1893 if (err)
1894 goto err;
1895
1896 mmc_release_host(host);
1897 err = mmc_add_card(host->card);
1898 if (err)
1899 goto remove_card;
1900
1901 mmc_claim_host(host);
1902 return 0;
1903
1904 remove_card:
1905 mmc_remove_card(host->card);
1906 host->card = NULL;
1907 mmc_claim_host(host);
1908 err:
1909 mmc_detach_bus(host);
1910
1911 pr_err("%s: error %d whilst initialising SD card\n",
1912 mmc_hostname(host), err);
1913
1914 return err;
1915 }
1916