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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 "sd.h"
30#include "sd_ops.h"
31
32static const unsigned int tran_exp[] = {
33 10000, 100000, 1000000, 10000000,
34 0, 0, 0, 0
35};
36
37static const unsigned char tran_mant[] = {
38 0, 10, 12, 13, 15, 20, 25, 30,
39 35, 40, 45, 50, 55, 60, 70, 80,
40};
41
42static const unsigned int taac_exp[] = {
43 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
44};
45
46static const unsigned int taac_mant[] = {
47 0, 10, 12, 13, 15, 20, 25, 30,
48 35, 40, 45, 50, 55, 60, 70, 80,
49};
50
51static const unsigned int sd_au_size[] = {
52 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
53 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
54 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
55 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
56};
57
58#define UNSTUFF_BITS(resp,start,size) \
59 ({ \
60 const int __size = size; \
61 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
62 const int __off = 3 - ((start) / 32); \
63 const int __shft = (start) & 31; \
64 u32 __res; \
65 \
66 __res = resp[__off] >> __shft; \
67 if (__size + __shft > 32) \
68 __res |= resp[__off-1] << ((32 - __shft) % 32); \
69 __res & __mask; \
70 })
71
72#define SD_POWEROFF_NOTIFY_TIMEOUT_MS 1000
73#define SD_WRITE_EXTR_SINGLE_TIMEOUT_MS 1000
74
75struct sd_busy_data {
76 struct mmc_card *card;
77 u8 *reg_buf;
78};
79
80/*
81 * Given the decoded CSD structure, decode the raw CID to our CID structure.
82 */
83void mmc_decode_cid(struct mmc_card *card)
84{
85 u32 *resp = card->raw_cid;
86
87 /*
88 * Add the raw card ID (cid) data to the entropy pool. It doesn't
89 * matter that not all of it is unique, it's just bonus entropy.
90 */
91 add_device_randomness(&card->raw_cid, sizeof(card->raw_cid));
92
93 /*
94 * SD doesn't currently have a version field so we will
95 * have to assume we can parse this.
96 */
97 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
98 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
99 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
100 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
101 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
102 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
103 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
104 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
105 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
106 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
107 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
108 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
109
110 card->cid.year += 2000; /* SD cards year offset */
111}
112
113/*
114 * Given a 128-bit response, decode to our card CSD structure.
115 */
116static int mmc_decode_csd(struct mmc_card *card)
117{
118 struct mmc_csd *csd = &card->csd;
119 unsigned int e, m, csd_struct;
120 u32 *resp = card->raw_csd;
121
122 csd_struct = UNSTUFF_BITS(resp, 126, 2);
123
124 switch (csd_struct) {
125 case 0:
126 m = UNSTUFF_BITS(resp, 115, 4);
127 e = UNSTUFF_BITS(resp, 112, 3);
128 csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10;
129 csd->taac_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
130
131 m = UNSTUFF_BITS(resp, 99, 4);
132 e = UNSTUFF_BITS(resp, 96, 3);
133 csd->max_dtr = tran_exp[e] * tran_mant[m];
134 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
135
136 e = UNSTUFF_BITS(resp, 47, 3);
137 m = UNSTUFF_BITS(resp, 62, 12);
138 csd->capacity = (1 + m) << (e + 2);
139
140 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
141 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
142 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
143 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
144 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
145 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
146 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
147 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
148
149 if (UNSTUFF_BITS(resp, 46, 1)) {
150 csd->erase_size = 1;
151 } else if (csd->write_blkbits >= 9) {
152 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
153 csd->erase_size <<= csd->write_blkbits - 9;
154 }
155
156 if (UNSTUFF_BITS(resp, 13, 1))
157 mmc_card_set_readonly(card);
158 break;
159 case 1:
160 /*
161 * This is a block-addressed SDHC or SDXC card. Most
162 * interesting fields are unused and have fixed
163 * values. To avoid getting tripped by buggy cards,
164 * we assume those fixed values ourselves.
165 */
166 mmc_card_set_blockaddr(card);
167
168 csd->taac_ns = 0; /* Unused */
169 csd->taac_clks = 0; /* Unused */
170
171 m = UNSTUFF_BITS(resp, 99, 4);
172 e = UNSTUFF_BITS(resp, 96, 3);
173 csd->max_dtr = tran_exp[e] * tran_mant[m];
174 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
175 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
176
177 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
178 if (csd->c_size >= 0xFFFF)
179 mmc_card_set_ext_capacity(card);
180
181 m = UNSTUFF_BITS(resp, 48, 22);
182 csd->capacity = (1 + m) << 10;
183
184 csd->read_blkbits = 9;
185 csd->read_partial = 0;
186 csd->write_misalign = 0;
187 csd->read_misalign = 0;
188 csd->r2w_factor = 4; /* Unused */
189 csd->write_blkbits = 9;
190 csd->write_partial = 0;
191 csd->erase_size = 1;
192
193 if (UNSTUFF_BITS(resp, 13, 1))
194 mmc_card_set_readonly(card);
195 break;
196 default:
197 pr_err("%s: unrecognised CSD structure version %d\n",
198 mmc_hostname(card->host), csd_struct);
199 return -EINVAL;
200 }
201
202 card->erase_size = csd->erase_size;
203
204 return 0;
205}
206
207/*
208 * Given a 64-bit response, decode to our card SCR structure.
209 */
210static int mmc_decode_scr(struct mmc_card *card)
211{
212 struct sd_scr *scr = &card->scr;
213 unsigned int scr_struct;
214 u32 resp[4];
215
216 resp[3] = card->raw_scr[1];
217 resp[2] = card->raw_scr[0];
218
219 scr_struct = UNSTUFF_BITS(resp, 60, 4);
220 if (scr_struct != 0) {
221 pr_err("%s: unrecognised SCR structure version %d\n",
222 mmc_hostname(card->host), scr_struct);
223 return -EINVAL;
224 }
225
226 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
227 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
228 if (scr->sda_vsn == SCR_SPEC_VER_2)
229 /* Check if Physical Layer Spec v3.0 is supported */
230 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
231
232 if (scr->sda_spec3) {
233 scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1);
234 scr->sda_specx = UNSTUFF_BITS(resp, 38, 4);
235 }
236
237 if (UNSTUFF_BITS(resp, 55, 1))
238 card->erased_byte = 0xFF;
239 else
240 card->erased_byte = 0x0;
241
242 if (scr->sda_spec4)
243 scr->cmds = UNSTUFF_BITS(resp, 32, 4);
244 else if (scr->sda_spec3)
245 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
246
247 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */
248 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
249 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
250 pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
251 return -EINVAL;
252 }
253
254 return 0;
255}
256
257/*
258 * Fetch and process SD Status register.
259 */
260static int mmc_read_ssr(struct mmc_card *card)
261{
262 unsigned int au, es, et, eo;
263 __be32 *raw_ssr;
264 u32 resp[4] = {};
265 u8 discard_support;
266 int i;
267
268 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
269 pr_warn("%s: card lacks mandatory SD Status function\n",
270 mmc_hostname(card->host));
271 return 0;
272 }
273
274 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
275 if (!raw_ssr)
276 return -ENOMEM;
277
278 if (mmc_app_sd_status(card, raw_ssr)) {
279 pr_warn("%s: problem reading SD Status register\n",
280 mmc_hostname(card->host));
281 kfree(raw_ssr);
282 return 0;
283 }
284
285 for (i = 0; i < 16; i++)
286 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
287
288 kfree(raw_ssr);
289
290 /*
291 * UNSTUFF_BITS only works with four u32s so we have to offset the
292 * bitfield positions accordingly.
293 */
294 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
295 if (au) {
296 if (au <= 9 || card->scr.sda_spec3) {
297 card->ssr.au = sd_au_size[au];
298 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
299 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
300 if (es && et) {
301 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
302 card->ssr.erase_timeout = (et * 1000) / es;
303 card->ssr.erase_offset = eo * 1000;
304 }
305 } else {
306 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
307 mmc_hostname(card->host));
308 }
309 }
310
311 /*
312 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set
313 */
314 resp[3] = card->raw_ssr[6];
315 discard_support = UNSTUFF_BITS(resp, 313 - 288, 1);
316 card->erase_arg = (card->scr.sda_specx && discard_support) ?
317 SD_DISCARD_ARG : SD_ERASE_ARG;
318
319 return 0;
320}
321
322/*
323 * Fetches and decodes switch information
324 */
325static int mmc_read_switch(struct mmc_card *card)
326{
327 int err;
328 u8 *status;
329
330 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
331 return 0;
332
333 if (!(card->csd.cmdclass & CCC_SWITCH)) {
334 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
335 mmc_hostname(card->host));
336 return 0;
337 }
338
339 status = kmalloc(64, GFP_KERNEL);
340 if (!status)
341 return -ENOMEM;
342
343 /*
344 * Find out the card's support bits with a mode 0 operation.
345 * The argument does not matter, as the support bits do not
346 * change with the arguments.
347 */
348 err = mmc_sd_switch(card, 0, 0, 0, status);
349 if (err) {
350 /*
351 * If the host or the card can't do the switch,
352 * fail more gracefully.
353 */
354 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
355 goto out;
356
357 pr_warn("%s: problem reading Bus Speed modes\n",
358 mmc_hostname(card->host));
359 err = 0;
360
361 goto out;
362 }
363
364 if (status[13] & SD_MODE_HIGH_SPEED)
365 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
366
367 if (card->scr.sda_spec3) {
368 card->sw_caps.sd3_bus_mode = status[13];
369 /* Driver Strengths supported by the card */
370 card->sw_caps.sd3_drv_type = status[9];
371 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
372 }
373
374out:
375 kfree(status);
376
377 return err;
378}
379
380/*
381 * Test if the card supports high-speed mode and, if so, switch to it.
382 */
383int mmc_sd_switch_hs(struct mmc_card *card)
384{
385 int err;
386 u8 *status;
387
388 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
389 return 0;
390
391 if (!(card->csd.cmdclass & CCC_SWITCH))
392 return 0;
393
394 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
395 return 0;
396
397 if (card->sw_caps.hs_max_dtr == 0)
398 return 0;
399
400 status = kmalloc(64, GFP_KERNEL);
401 if (!status)
402 return -ENOMEM;
403
404 err = mmc_sd_switch(card, 1, 0, HIGH_SPEED_BUS_SPEED, status);
405 if (err)
406 goto out;
407
408 if ((status[16] & 0xF) != HIGH_SPEED_BUS_SPEED) {
409 pr_warn("%s: Problem switching card into high-speed mode!\n",
410 mmc_hostname(card->host));
411 err = 0;
412 } else {
413 err = 1;
414 }
415
416out:
417 kfree(status);
418
419 return err;
420}
421
422static int sd_select_driver_type(struct mmc_card *card, u8 *status)
423{
424 int card_drv_type, drive_strength, drv_type;
425 int err;
426
427 card->drive_strength = 0;
428
429 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
430
431 drive_strength = mmc_select_drive_strength(card,
432 card->sw_caps.uhs_max_dtr,
433 card_drv_type, &drv_type);
434
435 if (drive_strength) {
436 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
437 if (err)
438 return err;
439 if ((status[15] & 0xF) != drive_strength) {
440 pr_warn("%s: Problem setting drive strength!\n",
441 mmc_hostname(card->host));
442 return 0;
443 }
444 card->drive_strength = drive_strength;
445 }
446
447 if (drv_type)
448 mmc_set_driver_type(card->host, drv_type);
449
450 return 0;
451}
452
453static void sd_update_bus_speed_mode(struct mmc_card *card)
454{
455 /*
456 * If the host doesn't support any of the UHS-I modes, fallback on
457 * default speed.
458 */
459 if (!mmc_host_uhs(card->host)) {
460 card->sd_bus_speed = 0;
461 return;
462 }
463
464 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
465 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
466 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
467 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
468 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
469 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
470 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
471 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
472 SD_MODE_UHS_SDR50)) {
473 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
474 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
475 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
476 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
477 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
478 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
479 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
480 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
481 SD_MODE_UHS_SDR12)) {
482 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
483 }
484}
485
486static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
487{
488 int err;
489 unsigned int timing = 0;
490
491 switch (card->sd_bus_speed) {
492 case UHS_SDR104_BUS_SPEED:
493 timing = MMC_TIMING_UHS_SDR104;
494 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
495 break;
496 case UHS_DDR50_BUS_SPEED:
497 timing = MMC_TIMING_UHS_DDR50;
498 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
499 break;
500 case UHS_SDR50_BUS_SPEED:
501 timing = MMC_TIMING_UHS_SDR50;
502 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
503 break;
504 case UHS_SDR25_BUS_SPEED:
505 timing = MMC_TIMING_UHS_SDR25;
506 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
507 break;
508 case UHS_SDR12_BUS_SPEED:
509 timing = MMC_TIMING_UHS_SDR12;
510 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
511 break;
512 default:
513 return 0;
514 }
515
516 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
517 if (err)
518 return err;
519
520 if ((status[16] & 0xF) != card->sd_bus_speed)
521 pr_warn("%s: Problem setting bus speed mode!\n",
522 mmc_hostname(card->host));
523 else {
524 mmc_set_timing(card->host, timing);
525 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
526 }
527
528 return 0;
529}
530
531/* Get host's max current setting at its current voltage */
532static u32 sd_get_host_max_current(struct mmc_host *host)
533{
534 u32 voltage, max_current;
535
536 voltage = 1 << host->ios.vdd;
537 switch (voltage) {
538 case MMC_VDD_165_195:
539 max_current = host->max_current_180;
540 break;
541 case MMC_VDD_29_30:
542 case MMC_VDD_30_31:
543 max_current = host->max_current_300;
544 break;
545 case MMC_VDD_32_33:
546 case MMC_VDD_33_34:
547 max_current = host->max_current_330;
548 break;
549 default:
550 max_current = 0;
551 }
552
553 return max_current;
554}
555
556static int sd_set_current_limit(struct mmc_card *card, u8 *status)
557{
558 int current_limit = SD_SET_CURRENT_NO_CHANGE;
559 int err;
560 u32 max_current;
561
562 /*
563 * Current limit switch is only defined for SDR50, SDR104, and DDR50
564 * bus speed modes. For other bus speed modes, we do not change the
565 * current limit.
566 */
567 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
568 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
569 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
570 return 0;
571
572 /*
573 * Host has different current capabilities when operating at
574 * different voltages, so find out its max current first.
575 */
576 max_current = sd_get_host_max_current(card->host);
577
578 /*
579 * We only check host's capability here, if we set a limit that is
580 * higher than the card's maximum current, the card will be using its
581 * maximum current, e.g. if the card's maximum current is 300ma, and
582 * when we set current limit to 200ma, the card will draw 200ma, and
583 * when we set current limit to 400/600/800ma, the card will draw its
584 * maximum 300ma from the host.
585 *
586 * The above is incorrect: if we try to set a current limit that is
587 * not supported by the card, the card can rightfully error out the
588 * attempt, and remain at the default current limit. This results
589 * in a 300mA card being limited to 200mA even though the host
590 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
591 * an iMX6 host. --rmk
592 */
593 if (max_current >= 800 &&
594 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
595 current_limit = SD_SET_CURRENT_LIMIT_800;
596 else if (max_current >= 600 &&
597 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
598 current_limit = SD_SET_CURRENT_LIMIT_600;
599 else if (max_current >= 400 &&
600 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
601 current_limit = SD_SET_CURRENT_LIMIT_400;
602 else if (max_current >= 200 &&
603 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
604 current_limit = SD_SET_CURRENT_LIMIT_200;
605
606 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
607 err = mmc_sd_switch(card, 1, 3, current_limit, status);
608 if (err)
609 return err;
610
611 if (((status[15] >> 4) & 0x0F) != current_limit)
612 pr_warn("%s: Problem setting current limit!\n",
613 mmc_hostname(card->host));
614
615 }
616
617 return 0;
618}
619
620/*
621 * UHS-I specific initialization procedure
622 */
623static int mmc_sd_init_uhs_card(struct mmc_card *card)
624{
625 int err;
626 u8 *status;
627
628 if (!(card->csd.cmdclass & CCC_SWITCH))
629 return 0;
630
631 status = kmalloc(64, GFP_KERNEL);
632 if (!status)
633 return -ENOMEM;
634
635 /* Set 4-bit bus width */
636 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
637 if (err)
638 goto out;
639
640 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
641
642 /*
643 * Select the bus speed mode depending on host
644 * and card capability.
645 */
646 sd_update_bus_speed_mode(card);
647
648 /* Set the driver strength for the card */
649 err = sd_select_driver_type(card, status);
650 if (err)
651 goto out;
652
653 /* Set current limit for the card */
654 err = sd_set_current_limit(card, status);
655 if (err)
656 goto out;
657
658 /* Set bus speed mode of the card */
659 err = sd_set_bus_speed_mode(card, status);
660 if (err)
661 goto out;
662
663 /*
664 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
665 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
666 */
667 if (!mmc_host_is_spi(card->host) &&
668 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
669 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
670 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
671 err = mmc_execute_tuning(card);
672
673 /*
674 * As SD Specifications Part1 Physical Layer Specification
675 * Version 3.01 says, CMD19 tuning is available for unlocked
676 * cards in transfer state of 1.8V signaling mode. The small
677 * difference between v3.00 and 3.01 spec means that CMD19
678 * tuning is also available for DDR50 mode.
679 */
680 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
681 pr_warn("%s: ddr50 tuning failed\n",
682 mmc_hostname(card->host));
683 err = 0;
684 }
685 }
686
687out:
688 kfree(status);
689
690 return err;
691}
692
693MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
694 card->raw_cid[2], card->raw_cid[3]);
695MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
696 card->raw_csd[2], card->raw_csd[3]);
697MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
698MMC_DEV_ATTR(ssr,
699 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
700 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
701 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
702 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
703 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
704 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
705 card->raw_ssr[15]);
706MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
707MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
708MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
709MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
710MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
711MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
712MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
713MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
714MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
715MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
716MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
717
718
719static ssize_t mmc_dsr_show(struct device *dev, struct device_attribute *attr,
720 char *buf)
721{
722 struct mmc_card *card = mmc_dev_to_card(dev);
723 struct mmc_host *host = card->host;
724
725 if (card->csd.dsr_imp && host->dsr_req)
726 return sysfs_emit(buf, "0x%x\n", host->dsr);
727 /* return default DSR value */
728 return sysfs_emit(buf, "0x%x\n", 0x404);
729}
730
731static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
732
733MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
734MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
735MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev);
736
737#define sdio_info_attr(num) \
738static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
739{ \
740 struct mmc_card *card = mmc_dev_to_card(dev); \
741 \
742 if (num > card->num_info) \
743 return -ENODATA; \
744 if (!card->info[num - 1][0]) \
745 return 0; \
746 return sysfs_emit(buf, "%s\n", card->info[num - 1]); \
747} \
748static DEVICE_ATTR_RO(info##num)
749
750sdio_info_attr(1);
751sdio_info_attr(2);
752sdio_info_attr(3);
753sdio_info_attr(4);
754
755static struct attribute *sd_std_attrs[] = {
756 &dev_attr_vendor.attr,
757 &dev_attr_device.attr,
758 &dev_attr_revision.attr,
759 &dev_attr_info1.attr,
760 &dev_attr_info2.attr,
761 &dev_attr_info3.attr,
762 &dev_attr_info4.attr,
763 &dev_attr_cid.attr,
764 &dev_attr_csd.attr,
765 &dev_attr_scr.attr,
766 &dev_attr_ssr.attr,
767 &dev_attr_date.attr,
768 &dev_attr_erase_size.attr,
769 &dev_attr_preferred_erase_size.attr,
770 &dev_attr_fwrev.attr,
771 &dev_attr_hwrev.attr,
772 &dev_attr_manfid.attr,
773 &dev_attr_name.attr,
774 &dev_attr_oemid.attr,
775 &dev_attr_serial.attr,
776 &dev_attr_ocr.attr,
777 &dev_attr_rca.attr,
778 &dev_attr_dsr.attr,
779 NULL,
780};
781
782static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr,
783 int index)
784{
785 struct device *dev = kobj_to_dev(kobj);
786 struct mmc_card *card = mmc_dev_to_card(dev);
787
788 /* CIS vendor and device ids, revision and info string are available only for Combo cards */
789 if ((attr == &dev_attr_vendor.attr ||
790 attr == &dev_attr_device.attr ||
791 attr == &dev_attr_revision.attr ||
792 attr == &dev_attr_info1.attr ||
793 attr == &dev_attr_info2.attr ||
794 attr == &dev_attr_info3.attr ||
795 attr == &dev_attr_info4.attr
796 ) &&!mmc_card_sd_combo(card))
797 return 0;
798
799 return attr->mode;
800}
801
802static const struct attribute_group sd_std_group = {
803 .attrs = sd_std_attrs,
804 .is_visible = sd_std_is_visible,
805};
806__ATTRIBUTE_GROUPS(sd_std);
807
808struct device_type sd_type = {
809 .groups = sd_std_groups,
810};
811
812/*
813 * Fetch CID from card.
814 */
815int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
816{
817 int err;
818 u32 max_current;
819 int retries = 10;
820 u32 pocr = ocr;
821
822try_again:
823 if (!retries) {
824 ocr &= ~SD_OCR_S18R;
825 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
826 }
827
828 /*
829 * Since we're changing the OCR value, we seem to
830 * need to tell some cards to go back to the idle
831 * state. We wait 1ms to give cards time to
832 * respond.
833 */
834 mmc_go_idle(host);
835
836 /*
837 * If SD_SEND_IF_COND indicates an SD 2.0
838 * compliant card and we should set bit 30
839 * of the ocr to indicate that we can handle
840 * block-addressed SDHC cards.
841 */
842 err = mmc_send_if_cond(host, ocr);
843 if (!err)
844 ocr |= SD_OCR_CCS;
845
846 /*
847 * If the host supports one of UHS-I modes, request the card
848 * to switch to 1.8V signaling level. If the card has failed
849 * repeatedly to switch however, skip this.
850 */
851 if (retries && mmc_host_uhs(host))
852 ocr |= SD_OCR_S18R;
853
854 /*
855 * If the host can supply more than 150mA at current voltage,
856 * XPC should be set to 1.
857 */
858 max_current = sd_get_host_max_current(host);
859 if (max_current > 150)
860 ocr |= SD_OCR_XPC;
861
862 err = mmc_send_app_op_cond(host, ocr, rocr);
863 if (err)
864 return err;
865
866 /*
867 * In case the S18A bit is set in the response, let's start the signal
868 * voltage switch procedure. SPI mode doesn't support CMD11.
869 * Note that, according to the spec, the S18A bit is not valid unless
870 * the CCS bit is set as well. We deliberately deviate from the spec in
871 * regards to this, which allows UHS-I to be supported for SDSC cards.
872 */
873 if (!mmc_host_is_spi(host) && (ocr & SD_OCR_S18R) &&
874 rocr && (*rocr & SD_ROCR_S18A)) {
875 err = mmc_set_uhs_voltage(host, pocr);
876 if (err == -EAGAIN) {
877 retries--;
878 goto try_again;
879 } else if (err) {
880 retries = 0;
881 goto try_again;
882 }
883 }
884
885 err = mmc_send_cid(host, cid);
886 return err;
887}
888
889int mmc_sd_get_csd(struct mmc_card *card)
890{
891 int err;
892
893 /*
894 * Fetch CSD from card.
895 */
896 err = mmc_send_csd(card, card->raw_csd);
897 if (err)
898 return err;
899
900 err = mmc_decode_csd(card);
901 if (err)
902 return err;
903
904 return 0;
905}
906
907static int mmc_sd_get_ro(struct mmc_host *host)
908{
909 int ro;
910
911 /*
912 * Some systems don't feature a write-protect pin and don't need one.
913 * E.g. because they only have micro-SD card slot. For those systems
914 * assume that the SD card is always read-write.
915 */
916 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
917 return 0;
918
919 if (!host->ops->get_ro)
920 return -1;
921
922 ro = host->ops->get_ro(host);
923
924 return ro;
925}
926
927int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
928 bool reinit)
929{
930 int err;
931
932 if (!reinit) {
933 /*
934 * Fetch SCR from card.
935 */
936 err = mmc_app_send_scr(card);
937 if (err)
938 return err;
939
940 err = mmc_decode_scr(card);
941 if (err)
942 return err;
943
944 /*
945 * Fetch and process SD Status register.
946 */
947 err = mmc_read_ssr(card);
948 if (err)
949 return err;
950
951 /* Erase init depends on CSD and SSR */
952 mmc_init_erase(card);
953 }
954
955 /*
956 * Fetch switch information from card. Note, sd3_bus_mode can change if
957 * voltage switch outcome changes, so do this always.
958 */
959 err = mmc_read_switch(card);
960 if (err)
961 return err;
962
963 /*
964 * For SPI, enable CRC as appropriate.
965 * This CRC enable is located AFTER the reading of the
966 * card registers because some SDHC cards are not able
967 * to provide valid CRCs for non-512-byte blocks.
968 */
969 if (mmc_host_is_spi(host)) {
970 err = mmc_spi_set_crc(host, use_spi_crc);
971 if (err)
972 return err;
973 }
974
975 /*
976 * Check if read-only switch is active.
977 */
978 if (!reinit) {
979 int ro = mmc_sd_get_ro(host);
980
981 if (ro < 0) {
982 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
983 mmc_hostname(host));
984 } else if (ro > 0) {
985 mmc_card_set_readonly(card);
986 }
987 }
988
989 return 0;
990}
991
992unsigned mmc_sd_get_max_clock(struct mmc_card *card)
993{
994 unsigned max_dtr = (unsigned int)-1;
995
996 if (mmc_card_hs(card)) {
997 if (max_dtr > card->sw_caps.hs_max_dtr)
998 max_dtr = card->sw_caps.hs_max_dtr;
999 } else if (max_dtr > card->csd.max_dtr) {
1000 max_dtr = card->csd.max_dtr;
1001 }
1002
1003 return max_dtr;
1004}
1005
1006static bool mmc_sd_card_using_v18(struct mmc_card *card)
1007{
1008 /*
1009 * According to the SD spec., the Bus Speed Mode (function group 1) bits
1010 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus
1011 * they can be used to determine if the card has already switched to
1012 * 1.8V signaling.
1013 */
1014 return card->sw_caps.sd3_bus_mode &
1015 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50);
1016}
1017
1018static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, u16 offset,
1019 u8 reg_data)
1020{
1021 struct mmc_host *host = card->host;
1022 struct mmc_request mrq = {};
1023 struct mmc_command cmd = {};
1024 struct mmc_data data = {};
1025 struct scatterlist sg;
1026 u8 *reg_buf;
1027
1028 reg_buf = kzalloc(512, GFP_KERNEL);
1029 if (!reg_buf)
1030 return -ENOMEM;
1031
1032 mrq.cmd = &cmd;
1033 mrq.data = &data;
1034
1035 /*
1036 * Arguments of CMD49:
1037 * [31:31] MIO (0 = memory).
1038 * [30:27] FNO (function number).
1039 * [26:26] MW - mask write mode (0 = disable).
1040 * [25:18] page number.
1041 * [17:9] offset address.
1042 * [8:0] length (0 = 1 byte).
1043 */
1044 cmd.arg = fno << 27 | page << 18 | offset << 9;
1045
1046 /* The first byte in the buffer is the data to be written. */
1047 reg_buf[0] = reg_data;
1048
1049 data.flags = MMC_DATA_WRITE;
1050 data.blksz = 512;
1051 data.blocks = 1;
1052 data.sg = &sg;
1053 data.sg_len = 1;
1054 sg_init_one(&sg, reg_buf, 512);
1055
1056 cmd.opcode = SD_WRITE_EXTR_SINGLE;
1057 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1058
1059 mmc_set_data_timeout(&data, card);
1060 mmc_wait_for_req(host, &mrq);
1061
1062 kfree(reg_buf);
1063
1064 /*
1065 * Note that, the SD card is allowed to signal busy on DAT0 up to 1s
1066 * after the CMD49. Although, let's leave this to be managed by the
1067 * caller.
1068 */
1069
1070 if (cmd.error)
1071 return cmd.error;
1072 if (data.error)
1073 return data.error;
1074
1075 return 0;
1076}
1077
1078static int sd_read_ext_reg(struct mmc_card *card, u8 fno, u8 page,
1079 u16 offset, u16 len, u8 *reg_buf)
1080{
1081 u32 cmd_args;
1082
1083 /*
1084 * Command arguments of CMD48:
1085 * [31:31] MIO (0 = memory).
1086 * [30:27] FNO (function number).
1087 * [26:26] reserved (0).
1088 * [25:18] page number.
1089 * [17:9] offset address.
1090 * [8:0] length (0 = 1 byte, 1ff = 512 bytes).
1091 */
1092 cmd_args = fno << 27 | page << 18 | offset << 9 | (len -1);
1093
1094 return mmc_send_adtc_data(card, card->host, SD_READ_EXTR_SINGLE,
1095 cmd_args, reg_buf, 512);
1096}
1097
1098static int sd_parse_ext_reg_power(struct mmc_card *card, u8 fno, u8 page,
1099 u16 offset)
1100{
1101 int err;
1102 u8 *reg_buf;
1103
1104 reg_buf = kzalloc(512, GFP_KERNEL);
1105 if (!reg_buf)
1106 return -ENOMEM;
1107
1108 /* Read the extension register for power management function. */
1109 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf);
1110 if (err) {
1111 pr_warn("%s: error %d reading PM func of ext reg\n",
1112 mmc_hostname(card->host), err);
1113 goto out;
1114 }
1115
1116 /* PM revision consists of 4 bits. */
1117 card->ext_power.rev = reg_buf[0] & 0xf;
1118
1119 /* Power Off Notification support at bit 4. */
1120 if (reg_buf[1] & BIT(4))
1121 card->ext_power.feature_support |= SD_EXT_POWER_OFF_NOTIFY;
1122
1123 /* Power Sustenance support at bit 5. */
1124 if (reg_buf[1] & BIT(5))
1125 card->ext_power.feature_support |= SD_EXT_POWER_SUSTENANCE;
1126
1127 /* Power Down Mode support at bit 6. */
1128 if (reg_buf[1] & BIT(6))
1129 card->ext_power.feature_support |= SD_EXT_POWER_DOWN_MODE;
1130
1131 card->ext_power.fno = fno;
1132 card->ext_power.page = page;
1133 card->ext_power.offset = offset;
1134
1135out:
1136 kfree(reg_buf);
1137 return err;
1138}
1139
1140static int sd_parse_ext_reg_perf(struct mmc_card *card, u8 fno, u8 page,
1141 u16 offset)
1142{
1143 int err;
1144 u8 *reg_buf;
1145
1146 reg_buf = kzalloc(512, GFP_KERNEL);
1147 if (!reg_buf)
1148 return -ENOMEM;
1149
1150 err = sd_read_ext_reg(card, fno, page, offset, 512, reg_buf);
1151 if (err) {
1152 pr_warn("%s: error %d reading PERF func of ext reg\n",
1153 mmc_hostname(card->host), err);
1154 goto out;
1155 }
1156
1157 /* PERF revision. */
1158 card->ext_perf.rev = reg_buf[0];
1159
1160 /* FX_EVENT support at bit 0. */
1161 if (reg_buf[1] & BIT(0))
1162 card->ext_perf.feature_support |= SD_EXT_PERF_FX_EVENT;
1163
1164 /* Card initiated self-maintenance support at bit 0. */
1165 if (reg_buf[2] & BIT(0))
1166 card->ext_perf.feature_support |= SD_EXT_PERF_CARD_MAINT;
1167
1168 /* Host initiated self-maintenance support at bit 1. */
1169 if (reg_buf[2] & BIT(1))
1170 card->ext_perf.feature_support |= SD_EXT_PERF_HOST_MAINT;
1171
1172 /* Cache support at bit 0. */
1173 if ((reg_buf[4] & BIT(0)) && !mmc_card_broken_sd_cache(card))
1174 card->ext_perf.feature_support |= SD_EXT_PERF_CACHE;
1175
1176 /* Command queue support indicated via queue depth bits (0 to 4). */
1177 if (reg_buf[6] & 0x1f)
1178 card->ext_perf.feature_support |= SD_EXT_PERF_CMD_QUEUE;
1179
1180 card->ext_perf.fno = fno;
1181 card->ext_perf.page = page;
1182 card->ext_perf.offset = offset;
1183
1184out:
1185 kfree(reg_buf);
1186 return err;
1187}
1188
1189static int sd_parse_ext_reg(struct mmc_card *card, u8 *gen_info_buf,
1190 u16 *next_ext_addr)
1191{
1192 u8 num_regs, fno, page;
1193 u16 sfc, offset, ext = *next_ext_addr;
1194 u32 reg_addr;
1195
1196 /*
1197 * Parse only one register set per extension, as that is sufficient to
1198 * support the standard functions. This means another 48 bytes in the
1199 * buffer must be available.
1200 */
1201 if (ext + 48 > 512)
1202 return -EFAULT;
1203
1204 /* Standard Function Code */
1205 memcpy(&sfc, &gen_info_buf[ext], 2);
1206
1207 /* Address to the next extension. */
1208 memcpy(next_ext_addr, &gen_info_buf[ext + 40], 2);
1209
1210 /* Number of registers for this extension. */
1211 num_regs = gen_info_buf[ext + 42];
1212
1213 /* We support only one register per extension. */
1214 if (num_regs != 1)
1215 return 0;
1216
1217 /* Extension register address. */
1218 memcpy(®_addr, &gen_info_buf[ext + 44], 4);
1219
1220 /* 9 bits (0 to 8) contains the offset address. */
1221 offset = reg_addr & 0x1ff;
1222
1223 /* 8 bits (9 to 16) contains the page number. */
1224 page = reg_addr >> 9 & 0xff ;
1225
1226 /* 4 bits (18 to 21) contains the function number. */
1227 fno = reg_addr >> 18 & 0xf;
1228
1229 /* Standard Function Code for power management. */
1230 if (sfc == 0x1)
1231 return sd_parse_ext_reg_power(card, fno, page, offset);
1232
1233 /* Standard Function Code for performance enhancement. */
1234 if (sfc == 0x2)
1235 return sd_parse_ext_reg_perf(card, fno, page, offset);
1236
1237 return 0;
1238}
1239
1240static int sd_read_ext_regs(struct mmc_card *card)
1241{
1242 int err, i;
1243 u8 num_ext, *gen_info_buf;
1244 u16 rev, len, next_ext_addr;
1245
1246 if (mmc_host_is_spi(card->host))
1247 return 0;
1248
1249 if (!(card->scr.cmds & SD_SCR_CMD48_SUPPORT))
1250 return 0;
1251
1252 gen_info_buf = kzalloc(512, GFP_KERNEL);
1253 if (!gen_info_buf)
1254 return -ENOMEM;
1255
1256 /*
1257 * Read 512 bytes of general info, which is found at function number 0,
1258 * at page 0 and with no offset.
1259 */
1260 err = sd_read_ext_reg(card, 0, 0, 0, 512, gen_info_buf);
1261 if (err) {
1262 pr_err("%s: error %d reading general info of SD ext reg\n",
1263 mmc_hostname(card->host), err);
1264 goto out;
1265 }
1266
1267 /* General info structure revision. */
1268 memcpy(&rev, &gen_info_buf[0], 2);
1269
1270 /* Length of general info in bytes. */
1271 memcpy(&len, &gen_info_buf[2], 2);
1272
1273 /* Number of extensions to be find. */
1274 num_ext = gen_info_buf[4];
1275
1276 /*
1277 * We only support revision 0 and limit it to 512 bytes for simplicity.
1278 * No matter what, let's return zero to allow us to continue using the
1279 * card, even if we can't support the features from the SD function
1280 * extensions registers.
1281 */
1282 if (rev != 0 || len > 512) {
1283 pr_warn("%s: non-supported SD ext reg layout\n",
1284 mmc_hostname(card->host));
1285 goto out;
1286 }
1287
1288 /*
1289 * Parse the extension registers. The first extension should start
1290 * immediately after the general info header (16 bytes).
1291 */
1292 next_ext_addr = 16;
1293 for (i = 0; i < num_ext; i++) {
1294 err = sd_parse_ext_reg(card, gen_info_buf, &next_ext_addr);
1295 if (err) {
1296 pr_err("%s: error %d parsing SD ext reg\n",
1297 mmc_hostname(card->host), err);
1298 goto out;
1299 }
1300 }
1301
1302out:
1303 kfree(gen_info_buf);
1304 return err;
1305}
1306
1307static bool sd_cache_enabled(struct mmc_host *host)
1308{
1309 return host->card->ext_perf.feature_enabled & SD_EXT_PERF_CACHE;
1310}
1311
1312static int sd_flush_cache(struct mmc_host *host)
1313{
1314 struct mmc_card *card = host->card;
1315 u8 *reg_buf, fno, page;
1316 u16 offset;
1317 int err;
1318
1319 if (!sd_cache_enabled(host))
1320 return 0;
1321
1322 reg_buf = kzalloc(512, GFP_KERNEL);
1323 if (!reg_buf)
1324 return -ENOMEM;
1325
1326 /*
1327 * Set Flush Cache at bit 0 in the performance enhancement register at
1328 * 261 bytes offset.
1329 */
1330 fno = card->ext_perf.fno;
1331 page = card->ext_perf.page;
1332 offset = card->ext_perf.offset + 261;
1333
1334 err = sd_write_ext_reg(card, fno, page, offset, BIT(0));
1335 if (err) {
1336 pr_warn("%s: error %d writing Cache Flush bit\n",
1337 mmc_hostname(host), err);
1338 goto out;
1339 }
1340
1341 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1342 MMC_BUSY_EXTR_SINGLE);
1343 if (err)
1344 goto out;
1345
1346 /*
1347 * Read the Flush Cache bit. The card shall reset it, to confirm that
1348 * it's has completed the flushing of the cache.
1349 */
1350 err = sd_read_ext_reg(card, fno, page, offset, 1, reg_buf);
1351 if (err) {
1352 pr_warn("%s: error %d reading Cache Flush bit\n",
1353 mmc_hostname(host), err);
1354 goto out;
1355 }
1356
1357 if (reg_buf[0] & BIT(0))
1358 err = -ETIMEDOUT;
1359out:
1360 kfree(reg_buf);
1361 return err;
1362}
1363
1364static int sd_enable_cache(struct mmc_card *card)
1365{
1366 u8 *reg_buf;
1367 int err;
1368
1369 card->ext_perf.feature_enabled &= ~SD_EXT_PERF_CACHE;
1370
1371 reg_buf = kzalloc(512, GFP_KERNEL);
1372 if (!reg_buf)
1373 return -ENOMEM;
1374
1375 /*
1376 * Set Cache Enable at bit 0 in the performance enhancement register at
1377 * 260 bytes offset.
1378 */
1379 err = sd_write_ext_reg(card, card->ext_perf.fno, card->ext_perf.page,
1380 card->ext_perf.offset + 260, BIT(0));
1381 if (err) {
1382 pr_warn("%s: error %d writing Cache Enable bit\n",
1383 mmc_hostname(card->host), err);
1384 goto out;
1385 }
1386
1387 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1388 MMC_BUSY_EXTR_SINGLE);
1389 if (!err)
1390 card->ext_perf.feature_enabled |= SD_EXT_PERF_CACHE;
1391
1392out:
1393 kfree(reg_buf);
1394 return err;
1395}
1396
1397/*
1398 * Handle the detection and initialisation of a card.
1399 *
1400 * In the case of a resume, "oldcard" will contain the card
1401 * we're trying to reinitialise.
1402 */
1403static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
1404 struct mmc_card *oldcard)
1405{
1406 struct mmc_card *card;
1407 int err;
1408 u32 cid[4];
1409 u32 rocr = 0;
1410 bool v18_fixup_failed = false;
1411
1412 WARN_ON(!host->claimed);
1413retry:
1414 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
1415 if (err)
1416 return err;
1417
1418 if (oldcard) {
1419 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1420 pr_debug("%s: Perhaps the card was replaced\n",
1421 mmc_hostname(host));
1422 return -ENOENT;
1423 }
1424
1425 card = oldcard;
1426 } else {
1427 /*
1428 * Allocate card structure.
1429 */
1430 card = mmc_alloc_card(host, &sd_type);
1431 if (IS_ERR(card))
1432 return PTR_ERR(card);
1433
1434 card->ocr = ocr;
1435 card->type = MMC_TYPE_SD;
1436 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1437 }
1438
1439 /*
1440 * Call the optional HC's init_card function to handle quirks.
1441 */
1442 if (host->ops->init_card)
1443 host->ops->init_card(host, card);
1444
1445 /*
1446 * For native busses: get card RCA and quit open drain mode.
1447 */
1448 if (!mmc_host_is_spi(host)) {
1449 err = mmc_send_relative_addr(host, &card->rca);
1450 if (err)
1451 goto free_card;
1452 }
1453
1454 if (!oldcard) {
1455 err = mmc_sd_get_csd(card);
1456 if (err)
1457 goto free_card;
1458
1459 mmc_decode_cid(card);
1460 }
1461
1462 /*
1463 * handling only for cards supporting DSR and hosts requesting
1464 * DSR configuration
1465 */
1466 if (card->csd.dsr_imp && host->dsr_req)
1467 mmc_set_dsr(host);
1468
1469 /*
1470 * Select card, as all following commands rely on that.
1471 */
1472 if (!mmc_host_is_spi(host)) {
1473 err = mmc_select_card(card);
1474 if (err)
1475 goto free_card;
1476 }
1477
1478 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1479 if (err)
1480 goto free_card;
1481
1482 /*
1483 * If the card has not been power cycled, it may still be using 1.8V
1484 * signaling. Detect that situation and try to initialize a UHS-I (1.8V)
1485 * transfer mode.
1486 */
1487 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
1488 mmc_sd_card_using_v18(card) &&
1489 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
1490 if (mmc_host_set_uhs_voltage(host) ||
1491 mmc_sd_init_uhs_card(card)) {
1492 v18_fixup_failed = true;
1493 mmc_power_cycle(host, ocr);
1494 if (!oldcard)
1495 mmc_remove_card(card);
1496 goto retry;
1497 }
1498 goto cont;
1499 }
1500
1501 /* Initialization sequence for UHS-I cards */
1502 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {
1503 err = mmc_sd_init_uhs_card(card);
1504 if (err)
1505 goto free_card;
1506 } else {
1507 /*
1508 * Attempt to change to high-speed (if supported)
1509 */
1510 err = mmc_sd_switch_hs(card);
1511 if (err > 0)
1512 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1513 else if (err)
1514 goto free_card;
1515
1516 /*
1517 * Set bus speed.
1518 */
1519 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1520
1521 if (host->ios.timing == MMC_TIMING_SD_HS &&
1522 host->ops->prepare_sd_hs_tuning) {
1523 err = host->ops->prepare_sd_hs_tuning(host, card);
1524 if (err)
1525 goto free_card;
1526 }
1527
1528 /*
1529 * Switch to wider bus (if supported).
1530 */
1531 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1532 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1533 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1534 if (err)
1535 goto free_card;
1536
1537 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1538 }
1539
1540 if (host->ios.timing == MMC_TIMING_SD_HS &&
1541 host->ops->execute_sd_hs_tuning) {
1542 err = host->ops->execute_sd_hs_tuning(host, card);
1543 if (err)
1544 goto free_card;
1545 }
1546 }
1547cont:
1548 if (!oldcard) {
1549 /* Read/parse the extension registers. */
1550 err = sd_read_ext_regs(card);
1551 if (err)
1552 goto free_card;
1553 }
1554
1555 /* Enable internal SD cache if supported. */
1556 if (card->ext_perf.feature_support & SD_EXT_PERF_CACHE) {
1557 err = sd_enable_cache(card);
1558 if (err)
1559 goto free_card;
1560 }
1561
1562 if (host->cqe_ops && !host->cqe_enabled) {
1563 err = host->cqe_ops->cqe_enable(host, card);
1564 if (!err) {
1565 host->cqe_enabled = true;
1566 host->hsq_enabled = true;
1567 pr_info("%s: Host Software Queue enabled\n",
1568 mmc_hostname(host));
1569 }
1570 }
1571
1572 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1573 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1574 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1575 mmc_hostname(host));
1576 err = -EINVAL;
1577 goto free_card;
1578 }
1579
1580 host->card = card;
1581 return 0;
1582
1583free_card:
1584 if (!oldcard)
1585 mmc_remove_card(card);
1586
1587 return err;
1588}
1589
1590/*
1591 * Host is being removed. Free up the current card.
1592 */
1593static void mmc_sd_remove(struct mmc_host *host)
1594{
1595 mmc_remove_card(host->card);
1596 host->card = NULL;
1597}
1598
1599/*
1600 * Card detection - card is alive.
1601 */
1602static int mmc_sd_alive(struct mmc_host *host)
1603{
1604 return mmc_send_status(host->card, NULL);
1605}
1606
1607/*
1608 * Card detection callback from host.
1609 */
1610static void mmc_sd_detect(struct mmc_host *host)
1611{
1612 int err;
1613
1614 mmc_get_card(host->card, NULL);
1615
1616 /*
1617 * Just check if our card has been removed.
1618 */
1619 err = _mmc_detect_card_removed(host);
1620
1621 mmc_put_card(host->card, NULL);
1622
1623 if (err) {
1624 mmc_sd_remove(host);
1625
1626 mmc_claim_host(host);
1627 mmc_detach_bus(host);
1628 mmc_power_off(host);
1629 mmc_release_host(host);
1630 }
1631}
1632
1633static int sd_can_poweroff_notify(struct mmc_card *card)
1634{
1635 return card->ext_power.feature_support & SD_EXT_POWER_OFF_NOTIFY;
1636}
1637
1638static int sd_busy_poweroff_notify_cb(void *cb_data, bool *busy)
1639{
1640 struct sd_busy_data *data = cb_data;
1641 struct mmc_card *card = data->card;
1642 int err;
1643
1644 /*
1645 * Read the status register for the power management function. It's at
1646 * one byte offset and is one byte long. The Power Off Notification
1647 * Ready is bit 0.
1648 */
1649 err = sd_read_ext_reg(card, card->ext_power.fno, card->ext_power.page,
1650 card->ext_power.offset + 1, 1, data->reg_buf);
1651 if (err) {
1652 pr_warn("%s: error %d reading status reg of PM func\n",
1653 mmc_hostname(card->host), err);
1654 return err;
1655 }
1656
1657 *busy = !(data->reg_buf[0] & BIT(0));
1658 return 0;
1659}
1660
1661static int sd_poweroff_notify(struct mmc_card *card)
1662{
1663 struct sd_busy_data cb_data;
1664 u8 *reg_buf;
1665 int err;
1666
1667 reg_buf = kzalloc(512, GFP_KERNEL);
1668 if (!reg_buf)
1669 return -ENOMEM;
1670
1671 /*
1672 * Set the Power Off Notification bit in the power management settings
1673 * register at 2 bytes offset.
1674 */
1675 err = sd_write_ext_reg(card, card->ext_power.fno, card->ext_power.page,
1676 card->ext_power.offset + 2, BIT(0));
1677 if (err) {
1678 pr_warn("%s: error %d writing Power Off Notify bit\n",
1679 mmc_hostname(card->host), err);
1680 goto out;
1681 }
1682
1683 /* Find out when the command is completed. */
1684 err = mmc_poll_for_busy(card, SD_WRITE_EXTR_SINGLE_TIMEOUT_MS, false,
1685 MMC_BUSY_EXTR_SINGLE);
1686 if (err)
1687 goto out;
1688
1689 cb_data.card = card;
1690 cb_data.reg_buf = reg_buf;
1691 err = __mmc_poll_for_busy(card->host, 0, SD_POWEROFF_NOTIFY_TIMEOUT_MS,
1692 &sd_busy_poweroff_notify_cb, &cb_data);
1693
1694out:
1695 kfree(reg_buf);
1696 return err;
1697}
1698
1699static int _mmc_sd_suspend(struct mmc_host *host)
1700{
1701 struct mmc_card *card = host->card;
1702 int err = 0;
1703
1704 mmc_claim_host(host);
1705
1706 if (mmc_card_suspended(card))
1707 goto out;
1708
1709 if (sd_can_poweroff_notify(card))
1710 err = sd_poweroff_notify(card);
1711 else if (!mmc_host_is_spi(host))
1712 err = mmc_deselect_cards(host);
1713
1714 if (!err) {
1715 mmc_power_off(host);
1716 mmc_card_set_suspended(card);
1717 }
1718
1719out:
1720 mmc_release_host(host);
1721 return err;
1722}
1723
1724/*
1725 * Callback for suspend
1726 */
1727static int mmc_sd_suspend(struct mmc_host *host)
1728{
1729 int err;
1730
1731 err = _mmc_sd_suspend(host);
1732 if (!err) {
1733 pm_runtime_disable(&host->card->dev);
1734 pm_runtime_set_suspended(&host->card->dev);
1735 }
1736
1737 return err;
1738}
1739
1740/*
1741 * This function tries to determine if the same card is still present
1742 * and, if so, restore all state to it.
1743 */
1744static int _mmc_sd_resume(struct mmc_host *host)
1745{
1746 int err = 0;
1747
1748 mmc_claim_host(host);
1749
1750 if (!mmc_card_suspended(host->card))
1751 goto out;
1752
1753 mmc_power_up(host, host->card->ocr);
1754 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1755 mmc_card_clr_suspended(host->card);
1756
1757out:
1758 mmc_release_host(host);
1759 return err;
1760}
1761
1762/*
1763 * Callback for resume
1764 */
1765static int mmc_sd_resume(struct mmc_host *host)
1766{
1767 pm_runtime_enable(&host->card->dev);
1768 return 0;
1769}
1770
1771/*
1772 * Callback for runtime_suspend.
1773 */
1774static int mmc_sd_runtime_suspend(struct mmc_host *host)
1775{
1776 int err;
1777
1778 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1779 return 0;
1780
1781 err = _mmc_sd_suspend(host);
1782 if (err)
1783 pr_err("%s: error %d doing aggressive suspend\n",
1784 mmc_hostname(host), err);
1785
1786 return err;
1787}
1788
1789/*
1790 * Callback for runtime_resume.
1791 */
1792static int mmc_sd_runtime_resume(struct mmc_host *host)
1793{
1794 int err;
1795
1796 err = _mmc_sd_resume(host);
1797 if (err && err != -ENOMEDIUM)
1798 pr_err("%s: error %d doing runtime resume\n",
1799 mmc_hostname(host), err);
1800
1801 return 0;
1802}
1803
1804static int mmc_sd_hw_reset(struct mmc_host *host)
1805{
1806 mmc_power_cycle(host, host->card->ocr);
1807 return mmc_sd_init_card(host, host->card->ocr, host->card);
1808}
1809
1810static const struct mmc_bus_ops mmc_sd_ops = {
1811 .remove = mmc_sd_remove,
1812 .detect = mmc_sd_detect,
1813 .runtime_suspend = mmc_sd_runtime_suspend,
1814 .runtime_resume = mmc_sd_runtime_resume,
1815 .suspend = mmc_sd_suspend,
1816 .resume = mmc_sd_resume,
1817 .alive = mmc_sd_alive,
1818 .shutdown = mmc_sd_suspend,
1819 .hw_reset = mmc_sd_hw_reset,
1820 .cache_enabled = sd_cache_enabled,
1821 .flush_cache = sd_flush_cache,
1822};
1823
1824/*
1825 * Starting point for SD card init.
1826 */
1827int mmc_attach_sd(struct mmc_host *host)
1828{
1829 int err;
1830 u32 ocr, rocr;
1831
1832 WARN_ON(!host->claimed);
1833
1834 err = mmc_send_app_op_cond(host, 0, &ocr);
1835 if (err)
1836 return err;
1837
1838 mmc_attach_bus(host, &mmc_sd_ops);
1839 if (host->ocr_avail_sd)
1840 host->ocr_avail = host->ocr_avail_sd;
1841
1842 /*
1843 * We need to get OCR a different way for SPI.
1844 */
1845 if (mmc_host_is_spi(host)) {
1846 mmc_go_idle(host);
1847
1848 err = mmc_spi_read_ocr(host, 0, &ocr);
1849 if (err)
1850 goto err;
1851 }
1852
1853 /*
1854 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1855 * these bits as being in-valid and especially also bit7.
1856 */
1857 ocr &= ~0x7FFF;
1858
1859 rocr = mmc_select_voltage(host, ocr);
1860
1861 /*
1862 * Can we support the voltage(s) of the card(s)?
1863 */
1864 if (!rocr) {
1865 err = -EINVAL;
1866 goto err;
1867 }
1868
1869 /*
1870 * Detect and init the card.
1871 */
1872 err = mmc_sd_init_card(host, rocr, NULL);
1873 if (err)
1874 goto err;
1875
1876 mmc_release_host(host);
1877 err = mmc_add_card(host->card);
1878 if (err)
1879 goto remove_card;
1880
1881 mmc_claim_host(host);
1882 return 0;
1883
1884remove_card:
1885 mmc_remove_card(host->card);
1886 host->card = NULL;
1887 mmc_claim_host(host);
1888err:
1889 mmc_detach_bus(host);
1890
1891 pr_err("%s: error %d whilst initialising SD card\n",
1892 mmc_hostname(host), err);
1893
1894 return err;
1895}
1/*
2 * linux/drivers/mmc/core/sd.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/err.h>
14#include <linux/slab.h>
15
16#include <linux/mmc/host.h>
17#include <linux/mmc/card.h>
18#include <linux/mmc/mmc.h>
19#include <linux/mmc/sd.h>
20
21#include "core.h"
22#include "bus.h"
23#include "mmc_ops.h"
24#include "sd.h"
25#include "sd_ops.h"
26
27static const unsigned int tran_exp[] = {
28 10000, 100000, 1000000, 10000000,
29 0, 0, 0, 0
30};
31
32static const unsigned char tran_mant[] = {
33 0, 10, 12, 13, 15, 20, 25, 30,
34 35, 40, 45, 50, 55, 60, 70, 80,
35};
36
37static const unsigned int tacc_exp[] = {
38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
39};
40
41static const unsigned int tacc_mant[] = {
42 0, 10, 12, 13, 15, 20, 25, 30,
43 35, 40, 45, 50, 55, 60, 70, 80,
44};
45
46#define UNSTUFF_BITS(resp,start,size) \
47 ({ \
48 const int __size = size; \
49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
50 const int __off = 3 - ((start) / 32); \
51 const int __shft = (start) & 31; \
52 u32 __res; \
53 \
54 __res = resp[__off] >> __shft; \
55 if (__size + __shft > 32) \
56 __res |= resp[__off-1] << ((32 - __shft) % 32); \
57 __res & __mask; \
58 })
59
60/*
61 * Given the decoded CSD structure, decode the raw CID to our CID structure.
62 */
63void mmc_decode_cid(struct mmc_card *card)
64{
65 u32 *resp = card->raw_cid;
66
67 memset(&card->cid, 0, sizeof(struct mmc_cid));
68
69 /*
70 * SD doesn't currently have a version field so we will
71 * have to assume we can parse this.
72 */
73 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
74 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
75 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
76 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
77 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
78 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
79 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
80 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
81 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
82 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
83 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
84 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
85
86 card->cid.year += 2000; /* SD cards year offset */
87}
88
89/*
90 * Given a 128-bit response, decode to our card CSD structure.
91 */
92static int mmc_decode_csd(struct mmc_card *card)
93{
94 struct mmc_csd *csd = &card->csd;
95 unsigned int e, m, csd_struct;
96 u32 *resp = card->raw_csd;
97
98 csd_struct = UNSTUFF_BITS(resp, 126, 2);
99
100 switch (csd_struct) {
101 case 0:
102 m = UNSTUFF_BITS(resp, 115, 4);
103 e = UNSTUFF_BITS(resp, 112, 3);
104 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
105 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
106
107 m = UNSTUFF_BITS(resp, 99, 4);
108 e = UNSTUFF_BITS(resp, 96, 3);
109 csd->max_dtr = tran_exp[e] * tran_mant[m];
110 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
111
112 e = UNSTUFF_BITS(resp, 47, 3);
113 m = UNSTUFF_BITS(resp, 62, 12);
114 csd->capacity = (1 + m) << (e + 2);
115
116 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
117 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
118 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
119 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
120 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
121 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
122 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
123
124 if (UNSTUFF_BITS(resp, 46, 1)) {
125 csd->erase_size = 1;
126 } else if (csd->write_blkbits >= 9) {
127 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
128 csd->erase_size <<= csd->write_blkbits - 9;
129 }
130 break;
131 case 1:
132 /*
133 * This is a block-addressed SDHC or SDXC card. Most
134 * interesting fields are unused and have fixed
135 * values. To avoid getting tripped by buggy cards,
136 * we assume those fixed values ourselves.
137 */
138 mmc_card_set_blockaddr(card);
139
140 csd->tacc_ns = 0; /* Unused */
141 csd->tacc_clks = 0; /* Unused */
142
143 m = UNSTUFF_BITS(resp, 99, 4);
144 e = UNSTUFF_BITS(resp, 96, 3);
145 csd->max_dtr = tran_exp[e] * tran_mant[m];
146 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
147 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
148
149 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
150 if (csd->c_size >= 0xFFFF)
151 mmc_card_set_ext_capacity(card);
152
153 m = UNSTUFF_BITS(resp, 48, 22);
154 csd->capacity = (1 + m) << 10;
155
156 csd->read_blkbits = 9;
157 csd->read_partial = 0;
158 csd->write_misalign = 0;
159 csd->read_misalign = 0;
160 csd->r2w_factor = 4; /* Unused */
161 csd->write_blkbits = 9;
162 csd->write_partial = 0;
163 csd->erase_size = 1;
164 break;
165 default:
166 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
167 mmc_hostname(card->host), csd_struct);
168 return -EINVAL;
169 }
170
171 card->erase_size = csd->erase_size;
172
173 return 0;
174}
175
176/*
177 * Given a 64-bit response, decode to our card SCR structure.
178 */
179static int mmc_decode_scr(struct mmc_card *card)
180{
181 struct sd_scr *scr = &card->scr;
182 unsigned int scr_struct;
183 u32 resp[4];
184
185 resp[3] = card->raw_scr[1];
186 resp[2] = card->raw_scr[0];
187
188 scr_struct = UNSTUFF_BITS(resp, 60, 4);
189 if (scr_struct != 0) {
190 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
191 mmc_hostname(card->host), scr_struct);
192 return -EINVAL;
193 }
194
195 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
196 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
197 if (scr->sda_vsn == SCR_SPEC_VER_2)
198 /* Check if Physical Layer Spec v3.0 is supported */
199 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
200
201 if (UNSTUFF_BITS(resp, 55, 1))
202 card->erased_byte = 0xFF;
203 else
204 card->erased_byte = 0x0;
205
206 if (scr->sda_spec3)
207 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
208 return 0;
209}
210
211/*
212 * Fetch and process SD Status register.
213 */
214static int mmc_read_ssr(struct mmc_card *card)
215{
216 unsigned int au, es, et, eo;
217 int err, i;
218 u32 *ssr;
219
220 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
221 printk(KERN_WARNING "%s: card lacks mandatory SD Status "
222 "function.\n", mmc_hostname(card->host));
223 return 0;
224 }
225
226 ssr = kmalloc(64, GFP_KERNEL);
227 if (!ssr)
228 return -ENOMEM;
229
230 err = mmc_app_sd_status(card, ssr);
231 if (err) {
232 printk(KERN_WARNING "%s: problem reading SD Status "
233 "register.\n", mmc_hostname(card->host));
234 err = 0;
235 goto out;
236 }
237
238 for (i = 0; i < 16; i++)
239 ssr[i] = be32_to_cpu(ssr[i]);
240
241 /*
242 * UNSTUFF_BITS only works with four u32s so we have to offset the
243 * bitfield positions accordingly.
244 */
245 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
246 if (au > 0 || au <= 9) {
247 card->ssr.au = 1 << (au + 4);
248 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
249 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
250 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
251 if (es && et) {
252 card->ssr.erase_timeout = (et * 1000) / es;
253 card->ssr.erase_offset = eo * 1000;
254 }
255 } else {
256 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit "
257 "size.\n", mmc_hostname(card->host));
258 }
259out:
260 kfree(ssr);
261 return err;
262}
263
264/*
265 * Fetches and decodes switch information
266 */
267static int mmc_read_switch(struct mmc_card *card)
268{
269 int err;
270 u8 *status;
271
272 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
273 return 0;
274
275 if (!(card->csd.cmdclass & CCC_SWITCH)) {
276 printk(KERN_WARNING "%s: card lacks mandatory switch "
277 "function, performance might suffer.\n",
278 mmc_hostname(card->host));
279 return 0;
280 }
281
282 err = -EIO;
283
284 status = kmalloc(64, GFP_KERNEL);
285 if (!status) {
286 printk(KERN_ERR "%s: could not allocate a buffer for "
287 "switch capabilities.\n",
288 mmc_hostname(card->host));
289 return -ENOMEM;
290 }
291
292 /* Find out the supported Bus Speed Modes. */
293 err = mmc_sd_switch(card, 0, 0, 1, status);
294 if (err) {
295 /*
296 * If the host or the card can't do the switch,
297 * fail more gracefully.
298 */
299 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
300 goto out;
301
302 printk(KERN_WARNING "%s: problem reading Bus Speed modes.\n",
303 mmc_hostname(card->host));
304 err = 0;
305
306 goto out;
307 }
308
309 if (card->scr.sda_spec3) {
310 card->sw_caps.sd3_bus_mode = status[13];
311
312 /* Find out Driver Strengths supported by the card */
313 err = mmc_sd_switch(card, 0, 2, 1, status);
314 if (err) {
315 /*
316 * If the host or the card can't do the switch,
317 * fail more gracefully.
318 */
319 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
320 goto out;
321
322 printk(KERN_WARNING "%s: problem reading "
323 "Driver Strength.\n",
324 mmc_hostname(card->host));
325 err = 0;
326
327 goto out;
328 }
329
330 card->sw_caps.sd3_drv_type = status[9];
331
332 /* Find out Current Limits supported by the card */
333 err = mmc_sd_switch(card, 0, 3, 1, status);
334 if (err) {
335 /*
336 * If the host or the card can't do the switch,
337 * fail more gracefully.
338 */
339 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
340 goto out;
341
342 printk(KERN_WARNING "%s: problem reading "
343 "Current Limit.\n",
344 mmc_hostname(card->host));
345 err = 0;
346
347 goto out;
348 }
349
350 card->sw_caps.sd3_curr_limit = status[7];
351 } else {
352 if (status[13] & 0x02)
353 card->sw_caps.hs_max_dtr = 50000000;
354 }
355
356out:
357 kfree(status);
358
359 return err;
360}
361
362/*
363 * Test if the card supports high-speed mode and, if so, switch to it.
364 */
365int mmc_sd_switch_hs(struct mmc_card *card)
366{
367 int err;
368 u8 *status;
369
370 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
371 return 0;
372
373 if (!(card->csd.cmdclass & CCC_SWITCH))
374 return 0;
375
376 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
377 return 0;
378
379 if (card->sw_caps.hs_max_dtr == 0)
380 return 0;
381
382 err = -EIO;
383
384 status = kmalloc(64, GFP_KERNEL);
385 if (!status) {
386 printk(KERN_ERR "%s: could not allocate a buffer for "
387 "switch capabilities.\n", mmc_hostname(card->host));
388 return -ENOMEM;
389 }
390
391 err = mmc_sd_switch(card, 1, 0, 1, status);
392 if (err)
393 goto out;
394
395 if ((status[16] & 0xF) != 1) {
396 printk(KERN_WARNING "%s: Problem switching card "
397 "into high-speed mode!\n",
398 mmc_hostname(card->host));
399 err = 0;
400 } else {
401 err = 1;
402 }
403
404out:
405 kfree(status);
406
407 return err;
408}
409
410static int sd_select_driver_type(struct mmc_card *card, u8 *status)
411{
412 int host_drv_type = SD_DRIVER_TYPE_B;
413 int card_drv_type = SD_DRIVER_TYPE_B;
414 int drive_strength;
415 int err;
416
417 /*
418 * If the host doesn't support any of the Driver Types A,C or D,
419 * or there is no board specific handler then default Driver
420 * Type B is used.
421 */
422 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
423 | MMC_CAP_DRIVER_TYPE_D)))
424 return 0;
425
426 if (!card->host->ops->select_drive_strength)
427 return 0;
428
429 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
430 host_drv_type |= SD_DRIVER_TYPE_A;
431
432 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
433 host_drv_type |= SD_DRIVER_TYPE_C;
434
435 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
436 host_drv_type |= SD_DRIVER_TYPE_D;
437
438 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
439 card_drv_type |= SD_DRIVER_TYPE_A;
440
441 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
442 card_drv_type |= SD_DRIVER_TYPE_C;
443
444 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
445 card_drv_type |= SD_DRIVER_TYPE_D;
446
447 /*
448 * The drive strength that the hardware can support
449 * depends on the board design. Pass the appropriate
450 * information and let the hardware specific code
451 * return what is possible given the options
452 */
453 drive_strength = card->host->ops->select_drive_strength(
454 card->sw_caps.uhs_max_dtr,
455 host_drv_type, card_drv_type);
456
457 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
458 if (err)
459 return err;
460
461 if ((status[15] & 0xF) != drive_strength) {
462 printk(KERN_WARNING "%s: Problem setting drive strength!\n",
463 mmc_hostname(card->host));
464 return 0;
465 }
466
467 mmc_set_driver_type(card->host, drive_strength);
468
469 return 0;
470}
471
472static void sd_update_bus_speed_mode(struct mmc_card *card)
473{
474 /*
475 * If the host doesn't support any of the UHS-I modes, fallback on
476 * default speed.
477 */
478 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
479 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) {
480 card->sd_bus_speed = 0;
481 return;
482 }
483
484 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
485 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
486 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
487 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
488 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
489 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
490 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
491 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
492 SD_MODE_UHS_SDR50)) {
493 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
494 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
495 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
496 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
497 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
498 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
499 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
500 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
501 SD_MODE_UHS_SDR12)) {
502 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
503 }
504}
505
506static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
507{
508 int err;
509 unsigned int timing = 0;
510
511 switch (card->sd_bus_speed) {
512 case UHS_SDR104_BUS_SPEED:
513 timing = MMC_TIMING_UHS_SDR104;
514 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
515 break;
516 case UHS_DDR50_BUS_SPEED:
517 timing = MMC_TIMING_UHS_DDR50;
518 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
519 break;
520 case UHS_SDR50_BUS_SPEED:
521 timing = MMC_TIMING_UHS_SDR50;
522 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
523 break;
524 case UHS_SDR25_BUS_SPEED:
525 timing = MMC_TIMING_UHS_SDR25;
526 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
527 break;
528 case UHS_SDR12_BUS_SPEED:
529 timing = MMC_TIMING_UHS_SDR12;
530 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
531 break;
532 default:
533 return 0;
534 }
535
536 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
537 if (err)
538 return err;
539
540 if ((status[16] & 0xF) != card->sd_bus_speed)
541 printk(KERN_WARNING "%s: Problem setting bus speed mode!\n",
542 mmc_hostname(card->host));
543 else {
544 mmc_set_timing(card->host, timing);
545 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
546 }
547
548 return 0;
549}
550
551static int sd_set_current_limit(struct mmc_card *card, u8 *status)
552{
553 int current_limit = 0;
554 int err;
555
556 /*
557 * Current limit switch is only defined for SDR50, SDR104, and DDR50
558 * bus speed modes. For other bus speed modes, we set the default
559 * current limit of 200mA.
560 */
561 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
562 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
563 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) {
564 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
565 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
566 current_limit = SD_SET_CURRENT_LIMIT_800;
567 else if (card->sw_caps.sd3_curr_limit &
568 SD_MAX_CURRENT_600)
569 current_limit = SD_SET_CURRENT_LIMIT_600;
570 else if (card->sw_caps.sd3_curr_limit &
571 SD_MAX_CURRENT_400)
572 current_limit = SD_SET_CURRENT_LIMIT_400;
573 else if (card->sw_caps.sd3_curr_limit &
574 SD_MAX_CURRENT_200)
575 current_limit = SD_SET_CURRENT_LIMIT_200;
576 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
577 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
578 current_limit = SD_SET_CURRENT_LIMIT_600;
579 else if (card->sw_caps.sd3_curr_limit &
580 SD_MAX_CURRENT_400)
581 current_limit = SD_SET_CURRENT_LIMIT_400;
582 else if (card->sw_caps.sd3_curr_limit &
583 SD_MAX_CURRENT_200)
584 current_limit = SD_SET_CURRENT_LIMIT_200;
585 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
586 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
587 current_limit = SD_SET_CURRENT_LIMIT_400;
588 else if (card->sw_caps.sd3_curr_limit &
589 SD_MAX_CURRENT_200)
590 current_limit = SD_SET_CURRENT_LIMIT_200;
591 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
592 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
593 current_limit = SD_SET_CURRENT_LIMIT_200;
594 }
595 } else
596 current_limit = SD_SET_CURRENT_LIMIT_200;
597
598 err = mmc_sd_switch(card, 1, 3, current_limit, status);
599 if (err)
600 return err;
601
602 if (((status[15] >> 4) & 0x0F) != current_limit)
603 printk(KERN_WARNING "%s: Problem setting current limit!\n",
604 mmc_hostname(card->host));
605
606 return 0;
607}
608
609/*
610 * UHS-I specific initialization procedure
611 */
612static int mmc_sd_init_uhs_card(struct mmc_card *card)
613{
614 int err;
615 u8 *status;
616
617 if (!card->scr.sda_spec3)
618 return 0;
619
620 if (!(card->csd.cmdclass & CCC_SWITCH))
621 return 0;
622
623 status = kmalloc(64, GFP_KERNEL);
624 if (!status) {
625 printk(KERN_ERR "%s: could not allocate a buffer for "
626 "switch capabilities.\n", mmc_hostname(card->host));
627 return -ENOMEM;
628 }
629
630 /* Set 4-bit bus width */
631 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
632 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
633 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
634 if (err)
635 goto out;
636
637 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
638 }
639
640 /*
641 * Select the bus speed mode depending on host
642 * and card capability.
643 */
644 sd_update_bus_speed_mode(card);
645
646 /* Set the driver strength for the card */
647 err = sd_select_driver_type(card, status);
648 if (err)
649 goto out;
650
651 /* Set current limit for the card */
652 err = sd_set_current_limit(card, status);
653 if (err)
654 goto out;
655
656 /* Set bus speed mode of the card */
657 err = sd_set_bus_speed_mode(card, status);
658 if (err)
659 goto out;
660
661 /* SPI mode doesn't define CMD19 */
662 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
663 err = card->host->ops->execute_tuning(card->host);
664
665out:
666 kfree(status);
667
668 return err;
669}
670
671MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
672 card->raw_cid[2], card->raw_cid[3]);
673MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
674 card->raw_csd[2], card->raw_csd[3]);
675MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
676MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
677MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
678MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
679MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
680MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
681MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
682MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
683MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
684MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
685
686
687static struct attribute *sd_std_attrs[] = {
688 &dev_attr_cid.attr,
689 &dev_attr_csd.attr,
690 &dev_attr_scr.attr,
691 &dev_attr_date.attr,
692 &dev_attr_erase_size.attr,
693 &dev_attr_preferred_erase_size.attr,
694 &dev_attr_fwrev.attr,
695 &dev_attr_hwrev.attr,
696 &dev_attr_manfid.attr,
697 &dev_attr_name.attr,
698 &dev_attr_oemid.attr,
699 &dev_attr_serial.attr,
700 NULL,
701};
702
703static struct attribute_group sd_std_attr_group = {
704 .attrs = sd_std_attrs,
705};
706
707static const struct attribute_group *sd_attr_groups[] = {
708 &sd_std_attr_group,
709 NULL,
710};
711
712struct device_type sd_type = {
713 .groups = sd_attr_groups,
714};
715
716/*
717 * Fetch CID from card.
718 */
719int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
720{
721 int err;
722
723 /*
724 * Since we're changing the OCR value, we seem to
725 * need to tell some cards to go back to the idle
726 * state. We wait 1ms to give cards time to
727 * respond.
728 */
729 mmc_go_idle(host);
730
731 /*
732 * If SD_SEND_IF_COND indicates an SD 2.0
733 * compliant card and we should set bit 30
734 * of the ocr to indicate that we can handle
735 * block-addressed SDHC cards.
736 */
737 err = mmc_send_if_cond(host, ocr);
738 if (!err)
739 ocr |= SD_OCR_CCS;
740
741 /*
742 * If the host supports one of UHS-I modes, request the card
743 * to switch to 1.8V signaling level.
744 */
745 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
746 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
747 ocr |= SD_OCR_S18R;
748
749 /* If the host can supply more than 150mA, XPC should be set to 1. */
750 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 |
751 MMC_CAP_SET_XPC_180))
752 ocr |= SD_OCR_XPC;
753
754try_again:
755 err = mmc_send_app_op_cond(host, ocr, rocr);
756 if (err)
757 return err;
758
759 /*
760 * In case CCS and S18A in the response is set, start Signal Voltage
761 * Switch procedure. SPI mode doesn't support CMD11.
762 */
763 if (!mmc_host_is_spi(host) && rocr &&
764 ((*rocr & 0x41000000) == 0x41000000)) {
765 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
766 if (err) {
767 ocr &= ~SD_OCR_S18R;
768 goto try_again;
769 }
770 }
771
772 if (mmc_host_is_spi(host))
773 err = mmc_send_cid(host, cid);
774 else
775 err = mmc_all_send_cid(host, cid);
776
777 return err;
778}
779
780int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
781{
782 int err;
783
784 /*
785 * Fetch CSD from card.
786 */
787 err = mmc_send_csd(card, card->raw_csd);
788 if (err)
789 return err;
790
791 err = mmc_decode_csd(card);
792 if (err)
793 return err;
794
795 return 0;
796}
797
798int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
799 bool reinit)
800{
801 int err;
802
803 if (!reinit) {
804 /*
805 * Fetch SCR from card.
806 */
807 err = mmc_app_send_scr(card, card->raw_scr);
808 if (err)
809 return err;
810
811 err = mmc_decode_scr(card);
812 if (err)
813 return err;
814
815 /*
816 * Fetch and process SD Status register.
817 */
818 err = mmc_read_ssr(card);
819 if (err)
820 return err;
821
822 /* Erase init depends on CSD and SSR */
823 mmc_init_erase(card);
824
825 /*
826 * Fetch switch information from card.
827 */
828 err = mmc_read_switch(card);
829 if (err)
830 return err;
831 }
832
833 /*
834 * For SPI, enable CRC as appropriate.
835 * This CRC enable is located AFTER the reading of the
836 * card registers because some SDHC cards are not able
837 * to provide valid CRCs for non-512-byte blocks.
838 */
839 if (mmc_host_is_spi(host)) {
840 err = mmc_spi_set_crc(host, use_spi_crc);
841 if (err)
842 return err;
843 }
844
845 /*
846 * Check if read-only switch is active.
847 */
848 if (!reinit) {
849 int ro = -1;
850
851 if (host->ops->get_ro)
852 ro = host->ops->get_ro(host);
853
854 if (ro < 0) {
855 printk(KERN_WARNING "%s: host does not "
856 "support reading read-only "
857 "switch. assuming write-enable.\n",
858 mmc_hostname(host));
859 } else if (ro > 0) {
860 mmc_card_set_readonly(card);
861 }
862 }
863
864 return 0;
865}
866
867unsigned mmc_sd_get_max_clock(struct mmc_card *card)
868{
869 unsigned max_dtr = (unsigned int)-1;
870
871 if (mmc_card_highspeed(card)) {
872 if (max_dtr > card->sw_caps.hs_max_dtr)
873 max_dtr = card->sw_caps.hs_max_dtr;
874 } else if (max_dtr > card->csd.max_dtr) {
875 max_dtr = card->csd.max_dtr;
876 }
877
878 return max_dtr;
879}
880
881void mmc_sd_go_highspeed(struct mmc_card *card)
882{
883 mmc_card_set_highspeed(card);
884 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
885}
886
887/*
888 * Handle the detection and initialisation of a card.
889 *
890 * In the case of a resume, "oldcard" will contain the card
891 * we're trying to reinitialise.
892 */
893static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
894 struct mmc_card *oldcard)
895{
896 struct mmc_card *card;
897 int err;
898 u32 cid[4];
899 u32 rocr = 0;
900
901 BUG_ON(!host);
902 WARN_ON(!host->claimed);
903
904 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
905 if (err)
906 return err;
907
908 if (oldcard) {
909 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
910 return -ENOENT;
911
912 card = oldcard;
913 } else {
914 /*
915 * Allocate card structure.
916 */
917 card = mmc_alloc_card(host, &sd_type);
918 if (IS_ERR(card))
919 return PTR_ERR(card);
920
921 card->type = MMC_TYPE_SD;
922 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
923 }
924
925 /*
926 * For native busses: get card RCA and quit open drain mode.
927 */
928 if (!mmc_host_is_spi(host)) {
929 err = mmc_send_relative_addr(host, &card->rca);
930 if (err)
931 return err;
932
933 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
934 }
935
936 if (!oldcard) {
937 err = mmc_sd_get_csd(host, card);
938 if (err)
939 return err;
940
941 mmc_decode_cid(card);
942 }
943
944 /*
945 * Select card, as all following commands rely on that.
946 */
947 if (!mmc_host_is_spi(host)) {
948 err = mmc_select_card(card);
949 if (err)
950 return err;
951 }
952
953 err = mmc_sd_setup_card(host, card, oldcard != NULL);
954 if (err)
955 goto free_card;
956
957 /* Initialization sequence for UHS-I cards */
958 if (rocr & SD_ROCR_S18A) {
959 err = mmc_sd_init_uhs_card(card);
960 if (err)
961 goto free_card;
962
963 /* Card is an ultra-high-speed card */
964 mmc_sd_card_set_uhs(card);
965
966 /*
967 * Since initialization is now complete, enable preset
968 * value registers for UHS-I cards.
969 */
970 if (host->ops->enable_preset_value)
971 host->ops->enable_preset_value(host, true);
972 } else {
973 /*
974 * Attempt to change to high-speed (if supported)
975 */
976 err = mmc_sd_switch_hs(card);
977 if (err > 0)
978 mmc_sd_go_highspeed(card);
979 else if (err)
980 goto free_card;
981
982 /*
983 * Set bus speed.
984 */
985 mmc_set_clock(host, mmc_sd_get_max_clock(card));
986
987 /*
988 * Switch to wider bus (if supported).
989 */
990 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
991 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
992 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
993 if (err)
994 goto free_card;
995
996 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
997 }
998 }
999
1000 host->card = card;
1001 return 0;
1002
1003free_card:
1004 if (!oldcard)
1005 mmc_remove_card(card);
1006
1007 return err;
1008}
1009
1010/*
1011 * Host is being removed. Free up the current card.
1012 */
1013static void mmc_sd_remove(struct mmc_host *host)
1014{
1015 BUG_ON(!host);
1016 BUG_ON(!host->card);
1017
1018 mmc_remove_card(host->card);
1019 host->card = NULL;
1020}
1021
1022/*
1023 * Card detection callback from host.
1024 */
1025static void mmc_sd_detect(struct mmc_host *host)
1026{
1027 int err;
1028
1029 BUG_ON(!host);
1030 BUG_ON(!host->card);
1031
1032 mmc_claim_host(host);
1033
1034 /*
1035 * Just check if our card has been removed.
1036 */
1037 err = mmc_send_status(host->card, NULL);
1038
1039 mmc_release_host(host);
1040
1041 if (err) {
1042 mmc_sd_remove(host);
1043
1044 mmc_claim_host(host);
1045 mmc_detach_bus(host);
1046 mmc_release_host(host);
1047 }
1048}
1049
1050/*
1051 * Suspend callback from host.
1052 */
1053static int mmc_sd_suspend(struct mmc_host *host)
1054{
1055 BUG_ON(!host);
1056 BUG_ON(!host->card);
1057
1058 mmc_claim_host(host);
1059 if (!mmc_host_is_spi(host))
1060 mmc_deselect_cards(host);
1061 host->card->state &= ~MMC_STATE_HIGHSPEED;
1062 mmc_release_host(host);
1063
1064 return 0;
1065}
1066
1067/*
1068 * Resume callback from host.
1069 *
1070 * This function tries to determine if the same card is still present
1071 * and, if so, restore all state to it.
1072 */
1073static int mmc_sd_resume(struct mmc_host *host)
1074{
1075 int err;
1076
1077 BUG_ON(!host);
1078 BUG_ON(!host->card);
1079
1080 mmc_claim_host(host);
1081 err = mmc_sd_init_card(host, host->ocr, host->card);
1082 mmc_release_host(host);
1083
1084 return err;
1085}
1086
1087static int mmc_sd_power_restore(struct mmc_host *host)
1088{
1089 int ret;
1090
1091 host->card->state &= ~MMC_STATE_HIGHSPEED;
1092 mmc_claim_host(host);
1093 ret = mmc_sd_init_card(host, host->ocr, host->card);
1094 mmc_release_host(host);
1095
1096 return ret;
1097}
1098
1099static const struct mmc_bus_ops mmc_sd_ops = {
1100 .remove = mmc_sd_remove,
1101 .detect = mmc_sd_detect,
1102 .suspend = NULL,
1103 .resume = NULL,
1104 .power_restore = mmc_sd_power_restore,
1105};
1106
1107static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1108 .remove = mmc_sd_remove,
1109 .detect = mmc_sd_detect,
1110 .suspend = mmc_sd_suspend,
1111 .resume = mmc_sd_resume,
1112 .power_restore = mmc_sd_power_restore,
1113};
1114
1115static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1116{
1117 const struct mmc_bus_ops *bus_ops;
1118
1119 if (!mmc_card_is_removable(host))
1120 bus_ops = &mmc_sd_ops_unsafe;
1121 else
1122 bus_ops = &mmc_sd_ops;
1123 mmc_attach_bus(host, bus_ops);
1124}
1125
1126/*
1127 * Starting point for SD card init.
1128 */
1129int mmc_attach_sd(struct mmc_host *host)
1130{
1131 int err;
1132 u32 ocr;
1133
1134 BUG_ON(!host);
1135 WARN_ON(!host->claimed);
1136
1137 /* Make sure we are at 3.3V signalling voltage */
1138 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
1139 if (err)
1140 return err;
1141
1142 /* Disable preset value enable if already set since last time */
1143 if (host->ops->enable_preset_value)
1144 host->ops->enable_preset_value(host, false);
1145
1146 err = mmc_send_app_op_cond(host, 0, &ocr);
1147 if (err)
1148 return err;
1149
1150 mmc_sd_attach_bus_ops(host);
1151 if (host->ocr_avail_sd)
1152 host->ocr_avail = host->ocr_avail_sd;
1153
1154 /*
1155 * We need to get OCR a different way for SPI.
1156 */
1157 if (mmc_host_is_spi(host)) {
1158 mmc_go_idle(host);
1159
1160 err = mmc_spi_read_ocr(host, 0, &ocr);
1161 if (err)
1162 goto err;
1163 }
1164
1165 /*
1166 * Sanity check the voltages that the card claims to
1167 * support.
1168 */
1169 if (ocr & 0x7F) {
1170 printk(KERN_WARNING "%s: card claims to support voltages "
1171 "below the defined range. These will be ignored.\n",
1172 mmc_hostname(host));
1173 ocr &= ~0x7F;
1174 }
1175
1176 if ((ocr & MMC_VDD_165_195) &&
1177 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1178 printk(KERN_WARNING "%s: SD card claims to support the "
1179 "incompletely defined 'low voltage range'. This "
1180 "will be ignored.\n", mmc_hostname(host));
1181 ocr &= ~MMC_VDD_165_195;
1182 }
1183
1184 host->ocr = mmc_select_voltage(host, ocr);
1185
1186 /*
1187 * Can we support the voltage(s) of the card(s)?
1188 */
1189 if (!host->ocr) {
1190 err = -EINVAL;
1191 goto err;
1192 }
1193
1194 /*
1195 * Detect and init the card.
1196 */
1197 err = mmc_sd_init_card(host, host->ocr, NULL);
1198 if (err)
1199 goto err;
1200
1201 mmc_release_host(host);
1202 err = mmc_add_card(host->card);
1203 mmc_claim_host(host);
1204 if (err)
1205 goto remove_card;
1206
1207 return 0;
1208
1209remove_card:
1210 mmc_release_host(host);
1211 mmc_remove_card(host->card);
1212 host->card = NULL;
1213 mmc_claim_host(host);
1214err:
1215 mmc_detach_bus(host);
1216
1217 printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
1218 mmc_hostname(host), err);
1219
1220 return err;
1221}
1222