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 * UHS-I specific initialization procedure
623 */
mmc_sd_init_uhs_card(struct mmc_card * card)624 static int mmc_sd_init_uhs_card(struct mmc_card *card)
625 {
626 int err;
627 u8 *status;
628
629 if (!(card->csd.cmdclass & CCC_SWITCH))
630 return 0;
631
632 status = kmalloc(64, GFP_KERNEL);
633 if (!status)
634 return -ENOMEM;
635
636 /* Set 4-bit bus width */
637 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
638 if (err)
639 goto out;
640
641 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
642
643 /*
644 * Select the bus speed mode depending on host
645 * and card capability.
646 */
647 sd_update_bus_speed_mode(card);
648
649 /* Set the driver strength for the card */
650 err = sd_select_driver_type(card, status);
651 if (err)
652 goto out;
653
654 /* Set current limit for the card */
655 err = sd_set_current_limit(card, status);
656 if (err)
657 goto out;
658
659 /* Set bus speed mode of the card */
660 err = sd_set_bus_speed_mode(card, status);
661 if (err)
662 goto out;
663
664 /*
665 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
666 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
667 */
668 if (!mmc_host_is_spi(card->host) &&
669 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
670 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
671 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
672 err = mmc_execute_tuning(card);
673
674 /*
675 * As SD Specifications Part1 Physical Layer Specification
676 * Version 3.01 says, CMD19 tuning is available for unlocked
677 * cards in transfer state of 1.8V signaling mode. The small
678 * difference between v3.00 and 3.01 spec means that CMD19
679 * tuning is also available for DDR50 mode.
680 */
681 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
682 pr_warn("%s: ddr50 tuning failed\n",
683 mmc_hostname(card->host));
684 err = 0;
685 }
686 }
687
688 out:
689 kfree(status);
690
691 return err;
692 }
693
694 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
695 card->raw_cid[2], card->raw_cid[3]);
696 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
697 card->raw_csd[2], card->raw_csd[3]);
698 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
699 MMC_DEV_ATTR(ssr,
700 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
701 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
702 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
703 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
704 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
705 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
706 card->raw_ssr[15]);
707 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
708 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
709 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
710 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
711 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
712 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
713 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
714 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
715 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
716 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
717 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
718
719
mmc_dsr_show(struct device * dev,struct device_attribute * attr,char * buf)720 static ssize_t mmc_dsr_show(struct device *dev, struct device_attribute *attr,
721 char *buf)
722 {
723 struct mmc_card *card = mmc_dev_to_card(dev);
724 struct mmc_host *host = card->host;
725
726 if (card->csd.dsr_imp && host->dsr_req)
727 return sysfs_emit(buf, "0x%x\n", host->dsr);
728 /* return default DSR value */
729 return sysfs_emit(buf, "0x%x\n", 0x404);
730 }
731
732 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
733
734 MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
735 MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
736 MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev);
737
738 #define sdio_info_attr(num) \
739 static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
740 { \
741 struct mmc_card *card = mmc_dev_to_card(dev); \
742 \
743 if (num > card->num_info) \
744 return -ENODATA; \
745 if (!card->info[num - 1][0]) \
746 return 0; \
747 return sysfs_emit(buf, "%s\n", card->info[num - 1]); \
748 } \
749 static DEVICE_ATTR_RO(info##num)
750
751 sdio_info_attr(1);
752 sdio_info_attr(2);
753 sdio_info_attr(3);
754 sdio_info_attr(4);
755
756 static struct attribute *sd_std_attrs[] = {
757 &dev_attr_vendor.attr,
758 &dev_attr_device.attr,
759 &dev_attr_revision.attr,
760 &dev_attr_info1.attr,
761 &dev_attr_info2.attr,
762 &dev_attr_info3.attr,
763 &dev_attr_info4.attr,
764 &dev_attr_cid.attr,
765 &dev_attr_csd.attr,
766 &dev_attr_scr.attr,
767 &dev_attr_ssr.attr,
768 &dev_attr_date.attr,
769 &dev_attr_erase_size.attr,
770 &dev_attr_preferred_erase_size.attr,
771 &dev_attr_fwrev.attr,
772 &dev_attr_hwrev.attr,
773 &dev_attr_manfid.attr,
774 &dev_attr_name.attr,
775 &dev_attr_oemid.attr,
776 &dev_attr_serial.attr,
777 &dev_attr_ocr.attr,
778 &dev_attr_rca.attr,
779 &dev_attr_dsr.attr,
780 NULL,
781 };
782
sd_std_is_visible(struct kobject * kobj,struct attribute * attr,int index)783 static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr,
784 int index)
785 {
786 struct device *dev = kobj_to_dev(kobj);
787 struct mmc_card *card = mmc_dev_to_card(dev);
788
789 /* CIS vendor and device ids, revision and info string are available only for Combo cards */
790 if ((attr == &dev_attr_vendor.attr ||
791 attr == &dev_attr_device.attr ||
792 attr == &dev_attr_revision.attr ||
793 attr == &dev_attr_info1.attr ||
794 attr == &dev_attr_info2.attr ||
795 attr == &dev_attr_info3.attr ||
796 attr == &dev_attr_info4.attr
797 ) &&!mmc_card_sd_combo(card))
798 return 0;
799
800 return attr->mode;
801 }
802
803 static const struct attribute_group sd_std_group = {
804 .attrs = sd_std_attrs,
805 .is_visible = sd_std_is_visible,
806 };
807 __ATTRIBUTE_GROUPS(sd_std);
808
809 struct device_type sd_type = {
810 .groups = sd_std_groups,
811 };
812
813 /*
814 * Fetch CID from card.
815 */
mmc_sd_get_cid(struct mmc_host * host,u32 ocr,u32 * cid,u32 * rocr)816 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
817 {
818 int err;
819 u32 max_current;
820 int retries = 10;
821 u32 pocr = ocr;
822
823 try_again:
824 if (!retries) {
825 ocr &= ~SD_OCR_S18R;
826 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
827 }
828
829 /*
830 * Since we're changing the OCR value, we seem to
831 * need to tell some cards to go back to the idle
832 * state. We wait 1ms to give cards time to
833 * respond.
834 */
835 mmc_go_idle(host);
836
837 /*
838 * If SD_SEND_IF_COND indicates an SD 2.0
839 * compliant card and we should set bit 30
840 * of the ocr to indicate that we can handle
841 * block-addressed SDHC cards.
842 */
843 err = mmc_send_if_cond(host, ocr);
844 if (!err)
845 ocr |= SD_OCR_CCS;
846
847 /*
848 * If the host supports one of UHS-I modes, request the card
849 * to switch to 1.8V signaling level. If the card has failed
850 * repeatedly to switch however, skip this.
851 */
852 if (retries && mmc_host_uhs(host))
853 ocr |= SD_OCR_S18R;
854
855 /*
856 * If the host can supply more than 150mA at current voltage,
857 * XPC should be set to 1.
858 */
859 max_current = sd_get_host_max_current(host);
860 if (max_current > 150)
861 ocr |= SD_OCR_XPC;
862
863 err = mmc_send_app_op_cond(host, ocr, rocr);
864 if (err)
865 return err;
866
867 /*
868 * In case the S18A bit is set in the response, let's start the signal
869 * voltage switch procedure. SPI mode doesn't support CMD11.
870 * Note that, according to the spec, the S18A bit is not valid unless
871 * the CCS bit is set as well. We deliberately deviate from the spec in
872 * regards to this, which allows UHS-I to be supported for SDSC cards.
873 */
874 if (!mmc_host_is_spi(host) && (ocr & SD_OCR_S18R) &&
875 rocr && (*rocr & SD_ROCR_S18A)) {
876 err = mmc_set_uhs_voltage(host, pocr);
877 if (err == -EAGAIN) {
878 retries--;
879 goto try_again;
880 } else if (err) {
881 retries = 0;
882 goto try_again;
883 }
884 }
885
886 err = mmc_send_cid(host, cid);
887 return err;
888 }
889
mmc_sd_get_csd(struct mmc_card * card)890 int mmc_sd_get_csd(struct mmc_card *card)
891 {
892 int err;
893
894 /*
895 * Fetch CSD from card.
896 */
897 err = mmc_send_csd(card, card->raw_csd);
898 if (err)
899 return err;
900
901 err = mmc_decode_csd(card);
902 if (err)
903 return err;
904
905 return 0;
906 }
907
mmc_sd_get_ro(struct mmc_host * host)908 static int mmc_sd_get_ro(struct mmc_host *host)
909 {
910 int ro;
911
912 /*
913 * Some systems don't feature a write-protect pin and don't need one.
914 * E.g. because they only have micro-SD card slot. For those systems
915 * assume that the SD card is always read-write.
916 */
917 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
918 return 0;
919
920 if (!host->ops->get_ro)
921 return -1;
922
923 ro = host->ops->get_ro(host);
924
925 return ro;
926 }
927
mmc_sd_setup_card(struct mmc_host * host,struct mmc_card * card,bool reinit)928 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
929 bool reinit)
930 {
931 int err;
932
933 if (!reinit) {
934 /*
935 * Fetch SCR from card.
936 */
937 err = mmc_app_send_scr(card);
938 if (err)
939 return err;
940
941 err = mmc_decode_scr(card);
942 if (err)
943 return err;
944
945 /*
946 * Fetch and process SD Status register.
947 */
948 err = mmc_read_ssr(card);
949 if (err)
950 return err;
951
952 /* Erase init depends on CSD and SSR */
953 mmc_init_erase(card);
954 }
955
956 /*
957 * Fetch switch information from card. Note, sd3_bus_mode can change if
958 * voltage switch outcome changes, so do this always.
959 */
960 err = mmc_read_switch(card);
961 if (err)
962 return err;
963
964 /*
965 * For SPI, enable CRC as appropriate.
966 * This CRC enable is located AFTER the reading of the
967 * card registers because some SDHC cards are not able
968 * to provide valid CRCs for non-512-byte blocks.
969 */
970 if (mmc_host_is_spi(host)) {
971 err = mmc_spi_set_crc(host, use_spi_crc);
972 if (err)
973 return err;
974 }
975
976 /*
977 * Check if read-only switch is active.
978 */
979 if (!reinit) {
980 int ro = mmc_sd_get_ro(host);
981
982 if (ro < 0) {
983 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
984 mmc_hostname(host));
985 } else if (ro > 0) {
986 mmc_card_set_readonly(card);
987 }
988 }
989
990 return 0;
991 }
992
mmc_sd_get_max_clock(struct mmc_card * card)993 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
994 {
995 unsigned max_dtr = (unsigned int)-1;
996
997 if (mmc_card_hs(card)) {
998 if (max_dtr > card->sw_caps.hs_max_dtr)
999 max_dtr = card->sw_caps.hs_max_dtr;
1000 } else if (max_dtr > card->csd.max_dtr) {
1001 max_dtr = card->csd.max_dtr;
1002 }
1003
1004 return max_dtr;
1005 }
1006
mmc_sd_card_using_v18(struct mmc_card * card)1007 static bool mmc_sd_card_using_v18(struct mmc_card *card)
1008 {
1009 /*
1010 * According to the SD spec., the Bus Speed Mode (function group 1) bits
1011 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus
1012 * they can be used to determine if the card has already switched to
1013 * 1.8V signaling.
1014 */
1015 return card->sw_caps.sd3_bus_mode &
1016 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50);
1017 }
1018
sd_write_ext_reg(struct mmc_card * card,u8 fno,u8 page,u16 offset,u8 reg_data)1019 static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, u16 offset,
1020 u8 reg_data)
1021 {
1022 struct mmc_host *host = card->host;
1023 struct mmc_request mrq = {};
1024 struct mmc_command cmd = {};
1025 struct mmc_data data = {};
1026 struct scatterlist sg;
1027 u8 *reg_buf;
1028
1029 reg_buf = kzalloc(512, GFP_KERNEL);
1030 if (!reg_buf)
1031 return -ENOMEM;
1032
1033 mrq.cmd = &cmd;
1034 mrq.data = &data;
1035
1036 /*
1037 * Arguments of CMD49:
1038 * [31:31] MIO (0 = memory).
1039 * [30:27] FNO (function number).
1040 * [26:26] MW - mask write mode (0 = disable).
1041 * [25:18] page number.
1042 * [17:9] offset address.
1043 * [8:0] length (0 = 1 byte).
1044 */
1045 cmd.arg = fno << 27 | page << 18 | offset << 9;
1046
1047 /* The first byte in the buffer is the data to be written. */
1048 reg_buf[0] = reg_data;
1049
1050 data.flags = MMC_DATA_WRITE;
1051 data.blksz = 512;
1052 data.blocks = 1;
1053 data.sg = &sg;
1054 data.sg_len = 1;
1055 sg_init_one(&sg, reg_buf, 512);
1056
1057 cmd.opcode = SD_WRITE_EXTR_SINGLE;
1058 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1059
1060 mmc_set_data_timeout(&data, card);
1061 mmc_wait_for_req(host, &mrq);
1062
1063 kfree(reg_buf);
1064
1065 /*
1066 * Note that, the SD card is allowed to signal busy on DAT0 up to 1s
1067 * after the CMD49. Although, let's leave this to be managed by the
1068 * caller.
1069 */
1070
1071 if (cmd.error)
1072 return cmd.error;
1073 if (data.error)
1074 return data.error;
1075
1076 return 0;
1077 }
1078
sd_read_ext_reg(struct mmc_card * card,u8 fno,u8 page,u16 offset,u16 len,u8 * reg_buf)1079 static int sd_read_ext_reg(struct mmc_card *card, u8 fno, u8 page,
1080 u16 offset, u16 len, u8 *reg_buf)
1081 {
1082 u32 cmd_args;
1083
1084 /*
1085 * Command arguments of CMD48:
1086 * [31:31] MIO (0 = memory).
1087 * [30:27] FNO (function number).
1088 * [26:26] reserved (0).
1089 * [25:18] page number.
1090 * [17:9] offset address.
1091 * [8:0] length (0 = 1 byte, 1ff = 512 bytes).
1092 */
1093 cmd_args = fno << 27 | page << 18 | offset << 9 | (len -1);
1094
1095 return mmc_send_adtc_data(card, card->host, SD_READ_EXTR_SINGLE,
1096 cmd_args, reg_buf, 512);
1097 }
1098
sd_parse_ext_reg_power(struct mmc_card * card,u8 fno,u8 page,u16 offset)1099 static int sd_parse_ext_reg_power(struct mmc_card *card, u8 fno, u8 page,
1100 u16 offset)
1101 {
1102 int err;
1103 u8 *reg_buf;
1104
1105 reg_buf = kzalloc(512, GFP_KERNEL);
1106 if (!reg_buf)
1107 return -ENOMEM;
1108
1109 /* Read the extension register for power management function. */
1110 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf);
1111 if (err) {
1112 pr_warn("%s: error %d reading PM func of ext reg\n",
1113 mmc_hostname(card->host), err);
1114 goto out;
1115 }
1116
1117 /* PM revision consists of 4 bits. */
1118 card->ext_power.rev = reg_buf[0] & 0xf;
1119
1120 /* Power Off Notification support at bit 4. */
1121 if ((reg_buf[1] & BIT(4)) && !mmc_card_broken_sd_poweroff_notify(card))
1122 card->ext_power.feature_support |= SD_EXT_POWER_OFF_NOTIFY;
1123
1124 /* Power Sustenance support at bit 5. */
1125 if (reg_buf[1] & BIT(5))
1126 card->ext_power.feature_support |= SD_EXT_POWER_SUSTENANCE;
1127
1128 /* Power Down Mode support at bit 6. */
1129 if (reg_buf[1] & BIT(6))
1130 card->ext_power.feature_support |= SD_EXT_POWER_DOWN_MODE;
1131
1132 card->ext_power.fno = fno;
1133 card->ext_power.page = page;
1134 card->ext_power.offset = offset;
1135
1136 out:
1137 kfree(reg_buf);
1138 return err;
1139 }
1140
sd_parse_ext_reg_perf(struct mmc_card * card,u8 fno,u8 page,u16 offset)1141 static int sd_parse_ext_reg_perf(struct mmc_card *card, u8 fno, u8 page,
1142 u16 offset)
1143 {
1144 int err;
1145 u8 *reg_buf;
1146
1147 reg_buf = kzalloc(512, GFP_KERNEL);
1148 if (!reg_buf)
1149 return -ENOMEM;
1150
1151 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf);
1152 if (err) {
1153 pr_warn("%s: error %d reading PERF func of ext reg\n",
1154 mmc_hostname(card->host), err);
1155 goto out;
1156 }
1157
1158 /* PERF revision. */
1159 card->ext_perf.rev = reg_buf[0];
1160
1161 /* FX_EVENT support at bit 0. */
1162 if (reg_buf[1] & BIT(0))
1163 card->ext_perf.feature_support |= SD_EXT_PERF_FX_EVENT;
1164
1165 /* Card initiated self-maintenance support at bit 0. */
1166 if (reg_buf[2] & BIT(0))
1167 card->ext_perf.feature_support |= SD_EXT_PERF_CARD_MAINT;
1168
1169 /* Host initiated self-maintenance support at bit 1. */
1170 if (reg_buf[2] & BIT(1))
1171 card->ext_perf.feature_support |= SD_EXT_PERF_HOST_MAINT;
1172
1173 /* Cache support at bit 0. */
1174 if ((reg_buf[4] & BIT(0)) && !mmc_card_broken_sd_cache(card))
1175 card->ext_perf.feature_support |= SD_EXT_PERF_CACHE;
1176
1177 /* Command queue support indicated via queue depth bits (0 to 4). */
1178 if (reg_buf[6] & 0x1f)
1179 card->ext_perf.feature_support |= SD_EXT_PERF_CMD_QUEUE;
1180
1181 card->ext_perf.fno = fno;
1182 card->ext_perf.page = page;
1183 card->ext_perf.offset = offset;
1184
1185 out:
1186 kfree(reg_buf);
1187 return err;
1188 }
1189
sd_parse_ext_reg(struct mmc_card * card,u8 * gen_info_buf,u16 * next_ext_addr)1190 static int sd_parse_ext_reg(struct mmc_card *card, u8 *gen_info_buf,
1191 u16 *next_ext_addr)
1192 {
1193 u8 num_regs, fno, page;
1194 u16 sfc, offset, ext = *next_ext_addr;
1195 u32 reg_addr;
1196
1197 /*
1198 * Parse only one register set per extension, as that is sufficient to
1199 * support the standard functions. This means another 48 bytes in the
1200 * buffer must be available.
1201 */
1202 if (ext + 48 > 512)
1203 return -EFAULT;
1204
1205 /* Standard Function Code */
1206 memcpy(&sfc, &gen_info_buf[ext], 2);
1207
1208 /* Address to the next extension. */
1209 memcpy(next_ext_addr, &gen_info_buf[ext + 40], 2);
1210
1211 /* Number of registers for this extension. */
1212 num_regs = gen_info_buf[ext + 42];
1213
1214 /* We support only one register per extension. */
1215 if (num_regs != 1)
1216 return 0;
1217
1218 /* Extension register address. */
1219 memcpy(®_addr, &gen_info_buf[ext + 44], 4);
1220
1221 /* 9 bits (0 to 8) contains the offset address. */
1222 offset = reg_addr & 0x1ff;
1223
1224 /* 8 bits (9 to 16) contains the page number. */
1225 page = reg_addr >> 9 & 0xff ;
1226
1227 /* 4 bits (18 to 21) contains the function number. */
1228 fno = reg_addr >> 18 & 0xf;
1229
1230 /* Standard Function Code for power management. */
1231 if (sfc == 0x1)
1232 return sd_parse_ext_reg_power(card, fno, page, offset);
1233
1234 /* Standard Function Code for performance enhancement. */
1235 if (sfc == 0x2)
1236 return sd_parse_ext_reg_perf(card, fno, page, offset);
1237
1238 return 0;
1239 }
1240
sd_read_ext_regs(struct mmc_card * card)1241 static int sd_read_ext_regs(struct mmc_card *card)
1242 {
1243 int err, i;
1244 u8 num_ext, *gen_info_buf;
1245 u16 rev, len, next_ext_addr;
1246
1247 if (mmc_host_is_spi(card->host))
1248 return 0;
1249
1250 if (!(card->scr.cmds & SD_SCR_CMD48_SUPPORT))
1251 return 0;
1252
1253 gen_info_buf = kzalloc(512, GFP_KERNEL);
1254 if (!gen_info_buf)
1255 return -ENOMEM;
1256
1257 /*
1258 * Read 512 bytes of general info, which is found at function number 0,
1259 * at page 0 and with no offset.
1260 */
1261 err = sd_read_ext_reg(card, 0, 0, 0, 512, gen_info_buf);
1262 if (err) {
1263 pr_err("%s: error %d reading general info of SD ext reg\n",
1264 mmc_hostname(card->host), err);
1265 goto out;
1266 }
1267
1268 /* General info structure revision. */
1269 memcpy(&rev, &gen_info_buf[0], 2);
1270
1271 /* Length of general info in bytes. */
1272 memcpy(&len, &gen_info_buf[2], 2);
1273
1274 /* Number of extensions to be find. */
1275 num_ext = gen_info_buf[4];
1276
1277 /*
1278 * We only support revision 0 and limit it to 512 bytes for simplicity.
1279 * No matter what, let's return zero to allow us to continue using the
1280 * card, even if we can't support the features from the SD function
1281 * extensions registers.
1282 */
1283 if (rev != 0 || len > 512) {
1284 pr_warn("%s: non-supported SD ext reg layout\n",
1285 mmc_hostname(card->host));
1286 goto out;
1287 }
1288
1289 /*
1290 * Parse the extension registers. The first extension should start
1291 * immediately after the general info header (16 bytes).
1292 */
1293 next_ext_addr = 16;
1294 for (i = 0; i < num_ext; i++) {
1295 err = sd_parse_ext_reg(card, gen_info_buf, &next_ext_addr);
1296 if (err) {
1297 pr_err("%s: error %d parsing SD ext reg\n",
1298 mmc_hostname(card->host), err);
1299 goto out;
1300 }
1301 }
1302
1303 out:
1304 kfree(gen_info_buf);
1305 return err;
1306 }
1307
sd_cache_enabled(struct mmc_host * host)1308 static bool sd_cache_enabled(struct mmc_host *host)
1309 {
1310 return host->card->ext_perf.feature_enabled & SD_EXT_PERF_CACHE;
1311 }
1312
sd_flush_cache(struct mmc_host * host)1313 static int sd_flush_cache(struct mmc_host *host)
1314 {
1315 struct mmc_card *card = host->card;
1316 u8 *reg_buf, fno, page;
1317 u16 offset;
1318 int err;
1319
1320 if (!sd_cache_enabled(host))
1321 return 0;
1322
1323 reg_buf = kzalloc(512, GFP_KERNEL);
1324 if (!reg_buf)
1325 return -ENOMEM;
1326
1327 /*
1328 * Set Flush Cache at bit 0 in the performance enhancement register at
1329 * 261 bytes offset.
1330 */
1331 fno = card->ext_perf.fno;
1332 page = card->ext_perf.page;
1333 offset = card->ext_perf.offset + 261;
1334
1335 err = sd_write_ext_reg(card, fno, page, offset, BIT(0));
1336 if (err) {
1337 pr_warn("%s: error %d writing Cache Flush bit\n",
1338 mmc_hostname(host), err);
1339 goto out;
1340 }
1341
1342 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1343 MMC_BUSY_EXTR_SINGLE);
1344 if (err)
1345 goto out;
1346
1347 /*
1348 * Read the Flush Cache bit. The card shall reset it, to confirm that
1349 * it's has completed the flushing of the cache.
1350 */
1351 err = sd_read_ext_reg(card, fno, page, offset, 1, reg_buf);
1352 if (err) {
1353 pr_warn("%s: error %d reading Cache Flush bit\n",
1354 mmc_hostname(host), err);
1355 goto out;
1356 }
1357
1358 if (reg_buf[0] & BIT(0))
1359 err = -ETIMEDOUT;
1360 out:
1361 kfree(reg_buf);
1362 return err;
1363 }
1364
sd_enable_cache(struct mmc_card * card)1365 static int sd_enable_cache(struct mmc_card *card)
1366 {
1367 u8 *reg_buf;
1368 int err;
1369
1370 card->ext_perf.feature_enabled &= ~SD_EXT_PERF_CACHE;
1371
1372 reg_buf = kzalloc(512, GFP_KERNEL);
1373 if (!reg_buf)
1374 return -ENOMEM;
1375
1376 /*
1377 * Set Cache Enable at bit 0 in the performance enhancement register at
1378 * 260 bytes offset.
1379 */
1380 err = sd_write_ext_reg(card, card->ext_perf.fno, card->ext_perf.page,
1381 card->ext_perf.offset + 260, BIT(0));
1382 if (err) {
1383 pr_warn("%s: error %d writing Cache Enable bit\n",
1384 mmc_hostname(card->host), err);
1385 goto out;
1386 }
1387
1388 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1389 MMC_BUSY_EXTR_SINGLE);
1390 if (!err)
1391 card->ext_perf.feature_enabled |= SD_EXT_PERF_CACHE;
1392
1393 out:
1394 kfree(reg_buf);
1395 return err;
1396 }
1397
1398 /*
1399 * Handle the detection and initialisation of a card.
1400 *
1401 * In the case of a resume, "oldcard" will contain the card
1402 * we're trying to reinitialise.
1403 */
mmc_sd_init_card(struct mmc_host * host,u32 ocr,struct mmc_card * oldcard)1404 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
1405 struct mmc_card *oldcard)
1406 {
1407 struct mmc_card *card;
1408 int err;
1409 u32 cid[4];
1410 u32 rocr = 0;
1411 bool v18_fixup_failed = false;
1412
1413 WARN_ON(!host->claimed);
1414 retry:
1415 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
1416 if (err)
1417 return err;
1418
1419 if (oldcard) {
1420 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1421 pr_debug("%s: Perhaps the card was replaced\n",
1422 mmc_hostname(host));
1423 return -ENOENT;
1424 }
1425
1426 card = oldcard;
1427 } else {
1428 /*
1429 * Allocate card structure.
1430 */
1431 card = mmc_alloc_card(host, &sd_type);
1432 if (IS_ERR(card))
1433 return PTR_ERR(card);
1434
1435 card->ocr = ocr;
1436 card->type = MMC_TYPE_SD;
1437 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1438 }
1439
1440 /*
1441 * Call the optional HC's init_card function to handle quirks.
1442 */
1443 if (host->ops->init_card)
1444 host->ops->init_card(host, card);
1445
1446 /*
1447 * For native busses: get card RCA and quit open drain mode.
1448 */
1449 if (!mmc_host_is_spi(host)) {
1450 err = mmc_send_relative_addr(host, &card->rca);
1451 if (err)
1452 goto free_card;
1453 }
1454
1455 if (!oldcard) {
1456 err = mmc_sd_get_csd(card);
1457 if (err)
1458 goto free_card;
1459
1460 mmc_decode_cid(card);
1461 }
1462
1463 /*
1464 * handling only for cards supporting DSR and hosts requesting
1465 * DSR configuration
1466 */
1467 if (card->csd.dsr_imp && host->dsr_req)
1468 mmc_set_dsr(host);
1469
1470 /*
1471 * Select card, as all following commands rely on that.
1472 */
1473 if (!mmc_host_is_spi(host)) {
1474 err = mmc_select_card(card);
1475 if (err)
1476 goto free_card;
1477 }
1478
1479 /* Apply quirks prior to card setup */
1480 mmc_fixup_device(card, mmc_sd_fixups);
1481
1482 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1483 if (err)
1484 goto free_card;
1485
1486 /*
1487 * If the card has not been power cycled, it may still be using 1.8V
1488 * signaling. Detect that situation and try to initialize a UHS-I (1.8V)
1489 * transfer mode.
1490 */
1491 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
1492 mmc_sd_card_using_v18(card) &&
1493 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
1494 if (mmc_host_set_uhs_voltage(host) ||
1495 mmc_sd_init_uhs_card(card)) {
1496 v18_fixup_failed = true;
1497 mmc_power_cycle(host, ocr);
1498 if (!oldcard)
1499 mmc_remove_card(card);
1500 goto retry;
1501 }
1502 goto cont;
1503 }
1504
1505 /* Initialization sequence for UHS-I cards */
1506 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {
1507 err = mmc_sd_init_uhs_card(card);
1508 if (err)
1509 goto free_card;
1510 } else {
1511 /*
1512 * Attempt to change to high-speed (if supported)
1513 */
1514 err = mmc_sd_switch_hs(card);
1515 if (err > 0)
1516 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1517 else if (err)
1518 goto free_card;
1519
1520 /*
1521 * Set bus speed.
1522 */
1523 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1524
1525 if (host->ios.timing == MMC_TIMING_SD_HS &&
1526 host->ops->prepare_sd_hs_tuning) {
1527 err = host->ops->prepare_sd_hs_tuning(host, card);
1528 if (err)
1529 goto free_card;
1530 }
1531
1532 /*
1533 * Switch to wider bus (if supported).
1534 */
1535 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1536 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1537 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1538 if (err)
1539 goto free_card;
1540
1541 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1542 }
1543
1544 if (host->ios.timing == MMC_TIMING_SD_HS &&
1545 host->ops->execute_sd_hs_tuning) {
1546 err = host->ops->execute_sd_hs_tuning(host, card);
1547 if (err)
1548 goto free_card;
1549 }
1550 }
1551 cont:
1552 if (!oldcard) {
1553 /* Read/parse the extension registers. */
1554 err = sd_read_ext_regs(card);
1555 if (err)
1556 goto free_card;
1557 }
1558
1559 /* Enable internal SD cache if supported. */
1560 if (card->ext_perf.feature_support & SD_EXT_PERF_CACHE) {
1561 err = sd_enable_cache(card);
1562 if (err)
1563 goto free_card;
1564 }
1565
1566 if (host->cqe_ops && !host->cqe_enabled) {
1567 err = host->cqe_ops->cqe_enable(host, card);
1568 if (!err) {
1569 host->cqe_enabled = true;
1570 host->hsq_enabled = true;
1571 pr_info("%s: Host Software Queue enabled\n",
1572 mmc_hostname(host));
1573 }
1574 }
1575
1576 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1577 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1578 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1579 mmc_hostname(host));
1580 err = -EINVAL;
1581 goto free_card;
1582 }
1583
1584 host->card = card;
1585 return 0;
1586
1587 free_card:
1588 if (!oldcard)
1589 mmc_remove_card(card);
1590
1591 return err;
1592 }
1593
1594 /*
1595 * Host is being removed. Free up the current card.
1596 */
mmc_sd_remove(struct mmc_host * host)1597 static void mmc_sd_remove(struct mmc_host *host)
1598 {
1599 mmc_remove_card(host->card);
1600 host->card = NULL;
1601 }
1602
1603 /*
1604 * Card detection - card is alive.
1605 */
mmc_sd_alive(struct mmc_host * host)1606 static int mmc_sd_alive(struct mmc_host *host)
1607 {
1608 return mmc_send_status(host->card, NULL);
1609 }
1610
1611 /*
1612 * Card detection callback from host.
1613 */
mmc_sd_detect(struct mmc_host * host)1614 static void mmc_sd_detect(struct mmc_host *host)
1615 {
1616 int err;
1617
1618 mmc_get_card(host->card, NULL);
1619
1620 /*
1621 * Just check if our card has been removed.
1622 */
1623 err = _mmc_detect_card_removed(host);
1624
1625 mmc_put_card(host->card, NULL);
1626
1627 if (err) {
1628 mmc_sd_remove(host);
1629
1630 mmc_claim_host(host);
1631 mmc_detach_bus(host);
1632 mmc_power_off(host);
1633 mmc_release_host(host);
1634 }
1635 }
1636
sd_can_poweroff_notify(struct mmc_card * card)1637 static int sd_can_poweroff_notify(struct mmc_card *card)
1638 {
1639 return card->ext_power.feature_support & SD_EXT_POWER_OFF_NOTIFY;
1640 }
1641
sd_busy_poweroff_notify_cb(void * cb_data,bool * busy)1642 static int sd_busy_poweroff_notify_cb(void *cb_data, bool *busy)
1643 {
1644 struct sd_busy_data *data = cb_data;
1645 struct mmc_card *card = data->card;
1646 int err;
1647
1648 /*
1649 * Read the status register for the power management function. It's at
1650 * one byte offset and is one byte long. The Power Off Notification
1651 * Ready is bit 0.
1652 */
1653 err = sd_read_ext_reg(card, card->ext_power.fno, card->ext_power.page,
1654 card->ext_power.offset + 1, 1, data->reg_buf);
1655 if (err) {
1656 pr_warn("%s: error %d reading status reg of PM func\n",
1657 mmc_hostname(card->host), err);
1658 return err;
1659 }
1660
1661 *busy = !(data->reg_buf[0] & BIT(0));
1662 return 0;
1663 }
1664
sd_poweroff_notify(struct mmc_card * card)1665 static int sd_poweroff_notify(struct mmc_card *card)
1666 {
1667 struct sd_busy_data cb_data;
1668 u8 *reg_buf;
1669 int err;
1670
1671 reg_buf = kzalloc(512, GFP_KERNEL);
1672 if (!reg_buf)
1673 return -ENOMEM;
1674
1675 /*
1676 * Set the Power Off Notification bit in the power management settings
1677 * register at 2 bytes offset.
1678 */
1679 err = sd_write_ext_reg(card, card->ext_power.fno, card->ext_power.page,
1680 card->ext_power.offset + 2, BIT(0));
1681 if (err) {
1682 pr_warn("%s: error %d writing Power Off Notify bit\n",
1683 mmc_hostname(card->host), err);
1684 goto out;
1685 }
1686
1687 /* Find out when the command is completed. */
1688 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1689 MMC_BUSY_EXTR_SINGLE);
1690 if (err)
1691 goto out;
1692
1693 cb_data.card = card;
1694 cb_data.reg_buf = reg_buf;
1695 err = __mmc_poll_for_busy(card->host, 0, SD_POWEROFF_NOTIFY_TIMEOUT_MS,
1696 &sd_busy_poweroff_notify_cb, &cb_data);
1697
1698 out:
1699 kfree(reg_buf);
1700 return err;
1701 }
1702
_mmc_sd_suspend(struct mmc_host * host)1703 static int _mmc_sd_suspend(struct mmc_host *host)
1704 {
1705 struct mmc_card *card = host->card;
1706 int err = 0;
1707
1708 mmc_claim_host(host);
1709
1710 if (mmc_card_suspended(card))
1711 goto out;
1712
1713 if (sd_can_poweroff_notify(card))
1714 err = sd_poweroff_notify(card);
1715 else if (!mmc_host_is_spi(host))
1716 err = mmc_deselect_cards(host);
1717
1718 if (!err) {
1719 mmc_power_off(host);
1720 mmc_card_set_suspended(card);
1721 }
1722
1723 out:
1724 mmc_release_host(host);
1725 return err;
1726 }
1727
1728 /*
1729 * Callback for suspend
1730 */
mmc_sd_suspend(struct mmc_host * host)1731 static int mmc_sd_suspend(struct mmc_host *host)
1732 {
1733 int err;
1734
1735 err = _mmc_sd_suspend(host);
1736 if (!err) {
1737 pm_runtime_disable(&host->card->dev);
1738 pm_runtime_set_suspended(&host->card->dev);
1739 }
1740
1741 return err;
1742 }
1743
1744 /*
1745 * This function tries to determine if the same card is still present
1746 * and, if so, restore all state to it.
1747 */
_mmc_sd_resume(struct mmc_host * host)1748 static int _mmc_sd_resume(struct mmc_host *host)
1749 {
1750 int err = 0;
1751
1752 mmc_claim_host(host);
1753
1754 if (!mmc_card_suspended(host->card))
1755 goto out;
1756
1757 mmc_power_up(host, host->card->ocr);
1758 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1759 mmc_card_clr_suspended(host->card);
1760
1761 out:
1762 mmc_release_host(host);
1763 return err;
1764 }
1765
1766 /*
1767 * Callback for resume
1768 */
mmc_sd_resume(struct mmc_host * host)1769 static int mmc_sd_resume(struct mmc_host *host)
1770 {
1771 pm_runtime_enable(&host->card->dev);
1772 return 0;
1773 }
1774
1775 /*
1776 * Callback for runtime_suspend.
1777 */
mmc_sd_runtime_suspend(struct mmc_host * host)1778 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1779 {
1780 int err;
1781
1782 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1783 return 0;
1784
1785 err = _mmc_sd_suspend(host);
1786 if (err)
1787 pr_err("%s: error %d doing aggressive suspend\n",
1788 mmc_hostname(host), err);
1789
1790 return err;
1791 }
1792
1793 /*
1794 * Callback for runtime_resume.
1795 */
mmc_sd_runtime_resume(struct mmc_host * host)1796 static int mmc_sd_runtime_resume(struct mmc_host *host)
1797 {
1798 int err;
1799
1800 err = _mmc_sd_resume(host);
1801 if (err && err != -ENOMEDIUM)
1802 pr_err("%s: error %d doing runtime resume\n",
1803 mmc_hostname(host), err);
1804
1805 return 0;
1806 }
1807
mmc_sd_hw_reset(struct mmc_host * host)1808 static int mmc_sd_hw_reset(struct mmc_host *host)
1809 {
1810 mmc_power_cycle(host, host->card->ocr);
1811 return mmc_sd_init_card(host, host->card->ocr, host->card);
1812 }
1813
1814 static const struct mmc_bus_ops mmc_sd_ops = {
1815 .remove = mmc_sd_remove,
1816 .detect = mmc_sd_detect,
1817 .runtime_suspend = mmc_sd_runtime_suspend,
1818 .runtime_resume = mmc_sd_runtime_resume,
1819 .suspend = mmc_sd_suspend,
1820 .resume = mmc_sd_resume,
1821 .alive = mmc_sd_alive,
1822 .shutdown = mmc_sd_suspend,
1823 .hw_reset = mmc_sd_hw_reset,
1824 .cache_enabled = sd_cache_enabled,
1825 .flush_cache = sd_flush_cache,
1826 };
1827
1828 /*
1829 * Starting point for SD card init.
1830 */
mmc_attach_sd(struct mmc_host * host)1831 int mmc_attach_sd(struct mmc_host *host)
1832 {
1833 int err;
1834 u32 ocr, rocr;
1835
1836 WARN_ON(!host->claimed);
1837
1838 err = mmc_send_app_op_cond(host, 0, &ocr);
1839 if (err)
1840 return err;
1841
1842 mmc_attach_bus(host, &mmc_sd_ops);
1843 if (host->ocr_avail_sd)
1844 host->ocr_avail = host->ocr_avail_sd;
1845
1846 /*
1847 * We need to get OCR a different way for SPI.
1848 */
1849 if (mmc_host_is_spi(host)) {
1850 mmc_go_idle(host);
1851
1852 err = mmc_spi_read_ocr(host, 0, &ocr);
1853 if (err)
1854 goto err;
1855 }
1856
1857 /*
1858 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1859 * these bits as being in-valid and especially also bit7.
1860 */
1861 ocr &= ~0x7FFF;
1862
1863 rocr = mmc_select_voltage(host, ocr);
1864
1865 /*
1866 * Can we support the voltage(s) of the card(s)?
1867 */
1868 if (!rocr) {
1869 err = -EINVAL;
1870 goto err;
1871 }
1872
1873 /*
1874 * Detect and init the card.
1875 */
1876 err = mmc_sd_init_card(host, rocr, NULL);
1877 if (err)
1878 goto err;
1879
1880 mmc_release_host(host);
1881 err = mmc_add_card(host->card);
1882 if (err)
1883 goto remove_card;
1884
1885 mmc_claim_host(host);
1886 return 0;
1887
1888 remove_card:
1889 mmc_remove_card(host->card);
1890 host->card = NULL;
1891 mmc_claim_host(host);
1892 err:
1893 mmc_detach_bus(host);
1894
1895 pr_err("%s: error %d whilst initialising SD card\n",
1896 mmc_hostname(host), err);
1897
1898 return err;
1899 }
1900