2 * linux/drivers/mmc/core/sd.c
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.
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.
13 #include <linux/err.h>
14 #include <linux/sizes.h>
15 #include <linux/slab.h>
16 #include <linux/stat.h>
17 #include <linux/pm_runtime.h>
19 #include <linux/mmc/host.h>
20 #include <linux/mmc/card.h>
21 #include <linux/mmc/mmc.h>
22 #include <linux/mmc/sd.h>
30 #define UHS_SDR104_MIN_DTR (100 * 1000 * 1000)
31 #define UHS_DDR50_MIN_DTR (50 * 1000 * 1000)
32 #define UHS_SDR50_MIN_DTR (50 * 1000 * 1000)
33 #define UHS_SDR25_MIN_DTR (25 * 1000 * 1000)
34 #define UHS_SDR12_MIN_DTR (12.5 * 1000 * 1000)
36 static const unsigned int tran_exp[] = {
37 10000, 100000, 1000000, 10000000,
41 static const unsigned char tran_mant[] = {
42 0, 10, 12, 13, 15, 20, 25, 30,
43 35, 40, 45, 50, 55, 60, 70, 80,
46 static const unsigned int tacc_exp[] = {
47 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
50 static const unsigned int tacc_mant[] = {
51 0, 10, 12, 13, 15, 20, 25, 30,
52 35, 40, 45, 50, 55, 60, 70, 80,
55 static const unsigned int sd_au_size[] = {
56 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
57 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
58 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
59 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
62 #define UNSTUFF_BITS(resp,start,size) \
64 const int __size = size; \
65 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
66 const int __off = 3 - ((start) / 32); \
67 const int __shft = (start) & 31; \
70 __res = resp[__off] >> __shft; \
71 if (__size + __shft > 32) \
72 __res |= resp[__off-1] << ((32 - __shft) % 32); \
77 * Given the decoded CSD structure, decode the raw CID to our CID structure.
79 void mmc_decode_cid(struct mmc_card *card)
81 u32 *resp = card->raw_cid;
83 memset(&card->cid, 0, sizeof(struct mmc_cid));
86 * SD doesn't currently have a version field so we will
87 * have to assume we can parse this.
89 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
90 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
91 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
92 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
93 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
94 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
95 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
96 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
97 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
98 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
99 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
100 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
102 card->cid.year += 2000; /* SD cards year offset */
106 * Given a 128-bit response, decode to our card CSD structure.
108 static int mmc_decode_csd(struct mmc_card *card)
110 struct mmc_csd *csd = &card->csd;
111 unsigned int e, m, csd_struct;
112 u32 *resp = card->raw_csd;
114 csd_struct = UNSTUFF_BITS(resp, 126, 2);
116 switch (csd_struct) {
118 m = UNSTUFF_BITS(resp, 115, 4);
119 e = UNSTUFF_BITS(resp, 112, 3);
120 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
121 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
123 m = UNSTUFF_BITS(resp, 99, 4);
124 e = UNSTUFF_BITS(resp, 96, 3);
125 csd->max_dtr = tran_exp[e] * tran_mant[m];
126 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
128 e = UNSTUFF_BITS(resp, 47, 3);
129 m = UNSTUFF_BITS(resp, 62, 12);
130 csd->capacity = (1 + m) << (e + 2);
132 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
133 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
134 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
135 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
136 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
137 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
138 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
139 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
141 if (UNSTUFF_BITS(resp, 46, 1)) {
143 } else if (csd->write_blkbits >= 9) {
144 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
145 csd->erase_size <<= csd->write_blkbits - 9;
150 * This is a block-addressed SDHC or SDXC card. Most
151 * interesting fields are unused and have fixed
152 * values. To avoid getting tripped by buggy cards,
153 * we assume those fixed values ourselves.
155 mmc_card_set_blockaddr(card);
157 csd->tacc_ns = 0; /* Unused */
158 csd->tacc_clks = 0; /* Unused */
160 m = UNSTUFF_BITS(resp, 99, 4);
161 e = UNSTUFF_BITS(resp, 96, 3);
162 csd->max_dtr = tran_exp[e] * tran_mant[m];
163 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
164 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
166 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
167 if (csd->c_size >= 0xFFFF)
168 mmc_card_set_ext_capacity(card);
170 m = UNSTUFF_BITS(resp, 48, 22);
171 csd->capacity = (1 + m) << 10;
173 csd->read_blkbits = 9;
174 csd->read_partial = 0;
175 csd->write_misalign = 0;
176 csd->read_misalign = 0;
177 csd->r2w_factor = 4; /* Unused */
178 csd->write_blkbits = 9;
179 csd->write_partial = 0;
183 pr_err("%s: unrecognised CSD structure version %d\n",
184 mmc_hostname(card->host), csd_struct);
188 card->erase_size = csd->erase_size;
194 * Given a 64-bit response, decode to our card SCR structure.
196 static int mmc_decode_scr(struct mmc_card *card)
198 struct sd_scr *scr = &card->scr;
199 unsigned int scr_struct;
202 resp[3] = card->raw_scr[1];
203 resp[2] = card->raw_scr[0];
205 scr_struct = UNSTUFF_BITS(resp, 60, 4);
206 if (scr_struct != 0) {
207 pr_err("%s: unrecognised SCR structure version %d\n",
208 mmc_hostname(card->host), scr_struct);
212 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
213 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
214 if (scr->sda_vsn == SCR_SPEC_VER_2)
215 /* Check if Physical Layer Spec v3.0 is supported */
216 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
218 if (UNSTUFF_BITS(resp, 55, 1))
219 card->erased_byte = 0xFF;
221 card->erased_byte = 0x0;
224 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
229 * Fetch and process SD Status register.
231 static int mmc_read_ssr(struct mmc_card *card)
233 unsigned int au, es, et, eo;
237 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
238 pr_warn("%s: card lacks mandatory SD Status function\n",
239 mmc_hostname(card->host));
243 ssr = kmalloc(64, GFP_KERNEL);
247 err = mmc_app_sd_status(card, ssr);
249 pr_warn("%s: problem reading SD Status register\n",
250 mmc_hostname(card->host));
255 for (i = 0; i < 16; i++)
256 ssr[i] = be32_to_cpu(ssr[i]);
259 * UNSTUFF_BITS only works with four u32s so we have to offset the
260 * bitfield positions accordingly.
262 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
264 if (au <= 9 || card->scr.sda_spec3) {
265 card->ssr.au = sd_au_size[au];
266 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
267 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
269 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
270 card->ssr.erase_timeout = (et * 1000) / es;
271 card->ssr.erase_offset = eo * 1000;
274 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
275 mmc_hostname(card->host));
284 * Fetches and decodes switch information
286 static int mmc_read_switch(struct mmc_card *card)
291 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
294 if (!(card->csd.cmdclass & CCC_SWITCH)) {
295 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
296 mmc_hostname(card->host));
302 status = kmalloc(64, GFP_KERNEL);
304 pr_err("%s: could not allocate a buffer for "
305 "switch capabilities.\n",
306 mmc_hostname(card->host));
311 * Find out the card's support bits with a mode 0 operation.
312 * The argument does not matter, as the support bits do not
313 * change with the arguments.
315 err = mmc_sd_switch(card, 0, 0, 0, status);
318 * If the host or the card can't do the switch,
319 * fail more gracefully.
321 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
324 pr_warn("%s: problem reading Bus Speed modes\n",
325 mmc_hostname(card->host));
331 if (status[13] & SD_MODE_HIGH_SPEED)
332 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
334 if (card->scr.sda_spec3) {
335 card->sw_caps.sd3_bus_mode = status[13];
336 /* Driver Strengths supported by the card */
337 card->sw_caps.sd3_drv_type = status[9];
338 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
348 * Test if the card supports high-speed mode and, if so, switch to it.
350 int mmc_sd_switch_hs(struct mmc_card *card)
355 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
358 if (!(card->csd.cmdclass & CCC_SWITCH))
361 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
364 if (card->sw_caps.hs_max_dtr == 0)
367 status = kmalloc(64, GFP_KERNEL);
369 pr_err("%s: could not allocate a buffer for "
370 "switch capabilities.\n", mmc_hostname(card->host));
374 err = mmc_sd_switch(card, 1, 0, 1, status);
378 if ((status[16] & 0xF) != 1) {
379 pr_warn("%s: Problem switching card into high-speed mode!, status:%x\n",
380 mmc_hostname(card->host), (status[16] & 0xF));
392 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
394 int card_drv_type, drive_strength, drv_type;
397 card->drive_strength = 0;
399 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
401 drive_strength = mmc_select_drive_strength(card,
402 card->sw_caps.uhs_max_dtr,
403 card_drv_type, &drv_type);
405 if (drive_strength) {
406 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
409 if ((status[15] & 0xF) != drive_strength) {
410 pr_warn("%s: Problem setting drive strength!\n",
411 mmc_hostname(card->host));
414 card->drive_strength = drive_strength;
418 mmc_set_driver_type(card->host, drv_type);
423 static void sd_update_bus_speed_mode(struct mmc_card *card)
426 * If the host doesn't support any of the UHS-I modes, fallback on
429 if (!mmc_host_uhs(card->host)) {
430 card->sd_bus_speed = 0;
434 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
435 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104) &&
436 (card->host->f_max > UHS_SDR104_MIN_DTR)) {
437 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
438 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
439 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
440 SD_MODE_UHS_SDR50) &&
441 (card->host->f_max > UHS_SDR50_MIN_DTR)) {
442 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
443 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
444 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50) &&
445 (card->host->f_max > UHS_DDR50_MIN_DTR)) {
446 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
447 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
448 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
449 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25) &&
450 (card->host->f_max > UHS_SDR25_MIN_DTR)) {
451 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
452 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
453 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
454 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
455 SD_MODE_UHS_SDR12)) {
456 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
460 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
463 unsigned int timing = 0;
465 switch (card->sd_bus_speed) {
466 case UHS_SDR104_BUS_SPEED:
467 timing = MMC_TIMING_UHS_SDR104;
468 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
470 case UHS_DDR50_BUS_SPEED:
471 timing = MMC_TIMING_UHS_DDR50;
472 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
474 case UHS_SDR50_BUS_SPEED:
475 timing = MMC_TIMING_UHS_SDR50;
476 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
478 case UHS_SDR25_BUS_SPEED:
479 timing = MMC_TIMING_UHS_SDR25;
480 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
482 case UHS_SDR12_BUS_SPEED:
483 timing = MMC_TIMING_UHS_SDR12;
484 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
490 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
494 if ((status[16] & 0xF) != card->sd_bus_speed) {
495 pr_warn("%s: Problem setting bus speed mode(%u)! max_dtr:%u, timing:%u, status:%x\n",
496 mmc_hostname(card->host), card->sd_bus_speed,
497 card->sw_caps.uhs_max_dtr, timing, (status[16] & 0xF));
500 mmc_set_timing(card->host, timing);
501 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
507 /* Get host's max current setting at its current voltage */
508 static u32 sd_get_host_max_current(struct mmc_host *host)
510 u32 voltage, max_current;
512 voltage = 1 << host->ios.vdd;
514 case MMC_VDD_165_195:
515 max_current = host->max_current_180;
519 max_current = host->max_current_300;
523 max_current = host->max_current_330;
532 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
534 int current_limit = SD_SET_CURRENT_NO_CHANGE;
539 * Current limit switch is only defined for SDR50, SDR104, and DDR50
540 * bus speed modes. For other bus speed modes, we do not change the
543 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
544 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
545 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
549 * Host has different current capabilities when operating at
550 * different voltages, so find out its max current first.
552 max_current = sd_get_host_max_current(card->host);
555 * We only check host's capability here, if we set a limit that is
556 * higher than the card's maximum current, the card will be using its
557 * maximum current, e.g. if the card's maximum current is 300ma, and
558 * when we set current limit to 200ma, the card will draw 200ma, and
559 * when we set current limit to 400/600/800ma, the card will draw its
560 * maximum 300ma from the host.
562 * The above is incorrect: if we try to set a current limit that is
563 * not supported by the card, the card can rightfully error out the
564 * attempt, and remain at the default current limit. This results
565 * in a 300mA card being limited to 200mA even though the host
566 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
567 * an iMX6 host. --rmk
569 if (max_current >= 800 &&
570 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
571 current_limit = SD_SET_CURRENT_LIMIT_800;
572 else if (max_current >= 600 &&
573 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
574 current_limit = SD_SET_CURRENT_LIMIT_600;
575 else if (max_current >= 400 &&
576 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
577 current_limit = SD_SET_CURRENT_LIMIT_400;
578 else if (max_current >= 200 &&
579 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
580 current_limit = SD_SET_CURRENT_LIMIT_200;
582 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
583 err = mmc_sd_switch(card, 1, 3, current_limit, status);
587 if (((status[15] >> 4) & 0x0F) != current_limit)
588 pr_warn("%s: Problem setting current limit!\n",
589 mmc_hostname(card->host));
597 * mmc_sd_change_bus_speed() - Change SD card bus frequency at runtime
598 * @host: pointer to mmc host structure
599 * @freq: pointer to desired frequency to be set
601 * Change the SD card bus frequency at runtime after the card is
602 * initialized. Callers are expected to make sure of the card's
603 * state (DATA/RCV/TRANSFER) beforing changing the frequency at runtime.
605 * If the frequency to change is greater than max. supported by card,
606 * *freq is changed to max. supported by card and if it is less than min.
607 * supported by host, *freq is changed to min. supported by host.
609 static int mmc_sd_change_bus_speed(struct mmc_host *host, unsigned long *freq)
612 struct mmc_card *card;
614 mmc_claim_host(host);
616 * Assign card pointer after claiming host to avoid race
617 * conditions that may arise during removal of the card.
622 if (!card || !freq) {
627 mmc_set_clock(host, (unsigned int) (*freq));
629 if (!mmc_host_is_spi(card->host) && mmc_card_uhs(card)
630 && card->host->ops->execute_tuning) {
632 * We try to probe host driver for tuning for any
633 * frequency, it is host driver responsibility to
634 * perform actual tuning only when required.
636 mmc_host_clk_hold(card->host);
637 err = card->host->ops->execute_tuning(card->host,
638 MMC_SEND_TUNING_BLOCK);
639 mmc_host_clk_release(card->host);
642 pr_warn("%s: %s: tuning execution failed %d. Restoring to previous clock %lu\n",
643 mmc_hostname(card->host), __func__, err,
644 host->clk_scaling.curr_freq);
645 mmc_set_clock(host, host->clk_scaling.curr_freq);
650 mmc_release_host(host);
655 * UHS-I specific initialization procedure
657 static int mmc_sd_init_uhs_card(struct mmc_card *card)
662 if (!card->scr.sda_spec3)
665 if (!(card->csd.cmdclass & CCC_SWITCH))
668 status = kmalloc(64, GFP_KERNEL);
670 pr_err("%s: could not allocate a buffer for "
671 "switch capabilities.\n", mmc_hostname(card->host));
675 /* Set 4-bit bus width */
676 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
677 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
678 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
682 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
686 * Select the bus speed mode depending on host
687 * and card capability.
689 sd_update_bus_speed_mode(card);
691 /* Set the driver strength for the card */
692 err = sd_select_driver_type(card, status);
696 /* Set current limit for the card */
697 err = sd_set_current_limit(card, status);
701 /* Set bus speed mode of the card */
702 err = sd_set_bus_speed_mode(card, status);
707 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
708 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
710 if (!mmc_host_is_spi(card->host) &&
711 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
712 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
713 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
714 err = mmc_execute_tuning(card);
717 * As SD Specifications Part1 Physical Layer Specification
718 * Version 3.01 says, CMD19 tuning is available for unlocked
719 * cards in transfer state of 1.8V signaling mode. The small
720 * difference between v3.00 and 3.01 spec means that CMD19
721 * tuning is also available for DDR50 mode.
723 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
724 pr_warn("%s: ddr50 tuning failed\n",
725 mmc_hostname(card->host));
736 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
737 card->raw_cid[2], card->raw_cid[3]);
738 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
739 card->raw_csd[2], card->raw_csd[3]);
740 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
741 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
742 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
743 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
744 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
745 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
746 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
747 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
748 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
749 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
752 static struct attribute *sd_std_attrs[] = {
757 &dev_attr_erase_size.attr,
758 &dev_attr_preferred_erase_size.attr,
759 &dev_attr_fwrev.attr,
760 &dev_attr_hwrev.attr,
761 &dev_attr_manfid.attr,
763 &dev_attr_oemid.attr,
764 &dev_attr_serial.attr,
767 ATTRIBUTE_GROUPS(sd_std);
769 struct device_type sd_type = {
770 .groups = sd_std_groups,
774 * Fetch CID from card.
776 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
786 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
790 * Since we're changing the OCR value, we seem to
791 * need to tell some cards to go back to the idle
792 * state. We wait 1ms to give cards time to
798 * If SD_SEND_IF_COND indicates an SD 2.0
799 * compliant card and we should set bit 30
800 * of the ocr to indicate that we can handle
801 * block-addressed SDHC cards.
803 err = mmc_send_if_cond(host, ocr);
808 * If the host supports one of UHS-I modes, request the card
809 * to switch to 1.8V signaling level. If the card has failed
810 * repeatedly to switch however, skip this.
812 if (retries && mmc_host_uhs(host))
816 * If the host can supply more than 150mA at current voltage,
817 * XPC should be set to 1.
819 max_current = sd_get_host_max_current(host);
820 if (max_current > 150)
823 err = mmc_send_app_op_cond(host, ocr, rocr);
828 * In case CCS and S18A in the response is set, start Signal Voltage
829 * Switch procedure. SPI mode doesn't support CMD11.
831 if (!mmc_host_is_spi(host) && rocr &&
832 ((*rocr & 0x41000000) == 0x41000000)) {
833 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
835 if (err == -EAGAIN) {
844 if (mmc_host_is_spi(host))
845 err = mmc_send_cid(host, cid);
847 err = mmc_all_send_cid(host, cid);
852 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
857 * Fetch CSD from card.
859 err = mmc_send_csd(card, card->raw_csd);
863 err = mmc_decode_csd(card);
870 static int mmc_sd_get_ro(struct mmc_host *host)
875 * Some systems don't feature a write-protect pin and don't need one.
876 * E.g. because they only have micro-SD card slot. For those systems
877 * assume that the SD card is always read-write.
879 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
882 if (!host->ops->get_ro)
885 mmc_host_clk_hold(host);
886 ro = host->ops->get_ro(host);
887 mmc_host_clk_release(host);
892 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
896 #ifdef CONFIG_MMC_PARANOID_SD_INIT
902 * Fetch SCR from card.
904 err = mmc_app_send_scr(card, card->raw_scr);
908 err = mmc_decode_scr(card);
913 * Fetch and process SD Status register.
915 err = mmc_read_ssr(card);
919 /* Erase init depends on CSD and SSR */
920 mmc_init_erase(card);
923 * Fetch switch information from card.
925 #ifdef CONFIG_MMC_PARANOID_SD_INIT
926 for (retries = 1; retries <= 3; retries++) {
927 err = mmc_read_switch(card);
937 "%s: read switch failed (attempt %d)\n",
938 mmc_hostname(host), retries);
942 err = mmc_read_switch(card);
950 * For SPI, enable CRC as appropriate.
951 * This CRC enable is located AFTER the reading of the
952 * card registers because some SDHC cards are not able
953 * to provide valid CRCs for non-512-byte blocks.
955 if (mmc_host_is_spi(host)) {
956 err = mmc_spi_set_crc(host, use_spi_crc);
962 * Check if read-only switch is active.
965 int ro = mmc_sd_get_ro(host);
968 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
971 mmc_card_set_readonly(card);
978 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
980 unsigned max_dtr = (unsigned int)-1;
982 if (mmc_card_uhs(card)) {
983 if (max_dtr > card->sw_caps.uhs_max_dtr)
984 max_dtr = card->sw_caps.uhs_max_dtr;
985 } else if (mmc_card_hs(card)) {
986 if (max_dtr > card->sw_caps.hs_max_dtr)
987 max_dtr = card->sw_caps.hs_max_dtr;
988 } else if (max_dtr > card->csd.max_dtr) {
989 max_dtr = card->csd.max_dtr;
996 * Handle the detection and initialisation of a card.
998 * In the case of a resume, "oldcard" will contain the card
999 * we're trying to reinitialise.
1001 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
1002 struct mmc_card *oldcard)
1004 struct mmc_card *card;
1010 WARN_ON(!host->claimed);
1012 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
1017 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
1023 * Allocate card structure.
1025 card = mmc_alloc_card(host, &sd_type);
1027 return PTR_ERR(card);
1030 card->type = MMC_TYPE_SD;
1031 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1035 * Call the optional HC's init_card function to handle quirks.
1037 if (host->ops->init_card)
1038 host->ops->init_card(host, card);
1041 * For native busses: get card RCA and quit open drain mode.
1043 if (!mmc_host_is_spi(host)) {
1044 err = mmc_send_relative_addr(host, &card->rca);
1051 err = mmc_sd_get_csd(host, card);
1055 mmc_decode_cid(card);
1059 * handling only for cards supporting DSR and hosts requesting
1062 if (card->csd.dsr_imp && host->dsr_req)
1066 * Select card, as all following commands rely on that.
1068 if (!mmc_host_is_spi(host)) {
1069 err = mmc_select_card(card);
1074 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1078 /* Initialization sequence for UHS-I cards */
1079 if (rocr & SD_ROCR_S18A) {
1080 err = mmc_sd_init_uhs_card(card);
1085 * Attempt to change to high-speed (if supported)
1087 err = mmc_sd_switch_hs(card);
1089 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1096 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1099 * Switch to wider bus (if supported).
1101 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1102 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1103 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1107 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1111 card->clk_scaling_highest = mmc_sd_get_max_clock(card);
1112 card->clk_scaling_lowest = host->f_min;
1119 mmc_remove_card(card);
1126 * Host is being removed. Free up the current card.
1128 static void mmc_sd_remove(struct mmc_host *host)
1131 BUG_ON(!host->card);
1133 mmc_exit_clk_scaling(host);
1134 mmc_remove_card(host->card);
1136 mmc_claim_host(host);
1138 mmc_release_host(host);
1142 * Card detection - card is alive.
1144 static int mmc_sd_alive(struct mmc_host *host)
1146 if (host->ops->get_cd && !host->ops->get_cd(host))
1149 return mmc_send_status(host->card, NULL);
1153 * Card detection callback from host.
1155 static void mmc_sd_detect(struct mmc_host *host)
1158 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1163 BUG_ON(!host->card);
1166 * Try to acquire claim host. If failed to get the lock in 2 sec,
1167 * just return; This is to ensure that when this call is invoked
1168 * due to pm_suspend, not to block suspend for longer duration.
1170 pm_runtime_get_sync(&host->card->dev);
1171 if (!mmc_try_claim_host(host, 2000)) {
1172 pm_runtime_mark_last_busy(&host->card->dev);
1173 pm_runtime_put_autosuspend(&host->card->dev);
1177 if (mmc_bus_needs_resume(host))
1178 mmc_resume_bus(host);
1180 if (host->ops->get_cd && !host->ops->get_cd(host)) {
1182 mmc_card_set_removed(host->card);
1183 mmc_card_clr_suspended(host->card);
1188 * Just check if our card has been removed.
1190 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1192 err = mmc_send_status(host->card, NULL);
1201 printk(KERN_ERR "%s(%s): Unable to re-detect card (%d)\n",
1202 __func__, mmc_hostname(host), err);
1203 err = _mmc_detect_card_removed(host);
1206 err = _mmc_detect_card_removed(host);
1210 mmc_put_card(host->card);
1213 mmc_sd_remove(host);
1215 mmc_claim_host(host);
1216 mmc_detach_bus(host);
1217 mmc_power_off(host);
1218 mmc_release_host(host);
1222 static int _mmc_sd_suspend(struct mmc_host *host)
1227 BUG_ON(!host->card);
1229 err = mmc_suspend_clk_scaling(host);
1231 pr_err("%s: %s: fail to suspend clock scaling (%d)\n",
1232 mmc_hostname(host), __func__, err);
1236 mmc_claim_host(host);
1238 if (mmc_card_suspended(host->card))
1241 if (!mmc_host_is_spi(host))
1242 err = mmc_deselect_cards(host);
1245 mmc_power_off(host);
1246 mmc_card_set_suspended(host->card);
1250 mmc_release_host(host);
1255 * Callback for suspend
1257 static int mmc_sd_suspend(struct mmc_host *host)
1261 MMC_TRACE(host, "%s: Enter\n", __func__);
1262 err = _mmc_sd_suspend(host);
1264 pm_runtime_disable(&host->card->dev);
1265 pm_runtime_set_suspended(&host->card->dev);
1266 /* if suspend fails, force mmc_detect_change during resume */
1267 } else if (mmc_bus_manual_resume(host))
1268 host->ignore_bus_resume_flags = true;
1270 MMC_TRACE(host, "%s: Exit err: %d\n", __func__, err);
1276 * This function tries to determine if the same card is still present
1277 * and, if so, restore all state to it.
1279 static int _mmc_sd_resume(struct mmc_host *host)
1282 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1287 BUG_ON(!host->card);
1289 mmc_claim_host(host);
1291 if (!mmc_card_suspended(host->card))
1294 if (host->ops->get_cd && !host->ops->get_cd(host)) {
1295 mmc_card_clr_suspended(host->card);
1299 mmc_power_up(host, host->card->ocr);
1300 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1303 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1306 printk(KERN_ERR "%s: Re-init card rc = %d (retries = %d)\n",
1307 mmc_hostname(host), err, retries);
1309 mmc_power_off(host);
1310 usleep_range(5000, 5500);
1311 mmc_power_up(host, host->card->ocr);
1312 mmc_select_voltage(host, host->card->ocr);
1318 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1321 pr_err("%s: %s: mmc_sd_init_card_failed (%d)\n",
1322 mmc_hostname(host), __func__, err);
1323 mmc_power_off(host);
1326 mmc_card_clr_suspended(host->card);
1328 if (host->card->sdr104_blocked)
1330 err = mmc_resume_clk_scaling(host);
1332 pr_err("%s: %s: fail to resume clock scaling (%d)\n",
1333 mmc_hostname(host), __func__, err);
1338 mmc_release_host(host);
1343 * Callback for resume
1345 static int mmc_sd_resume(struct mmc_host *host)
1349 MMC_TRACE(host, "%s: Enter\n", __func__);
1350 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1351 err = _mmc_sd_resume(host);
1352 pm_runtime_set_active(&host->card->dev);
1353 pm_runtime_mark_last_busy(&host->card->dev);
1355 pm_runtime_enable(&host->card->dev);
1356 MMC_TRACE(host, "%s: Exit err: %d\n", __func__, err);
1362 * Callback for runtime_suspend.
1364 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1368 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1371 err = _mmc_sd_suspend(host);
1373 pr_err("%s: error %d doing aggressive suspend\n",
1374 mmc_hostname(host), err);
1380 * Callback for runtime_resume.
1382 static int mmc_sd_runtime_resume(struct mmc_host *host)
1386 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1389 err = _mmc_sd_resume(host);
1391 pr_err("%s: error %d doing aggressive resume\n",
1392 mmc_hostname(host), err);
1397 static int mmc_sd_reset(struct mmc_host *host)
1399 if (host->ops->get_cd && !host->ops->get_cd(host))
1402 mmc_power_cycle(host, host->card->ocr);
1403 return mmc_sd_init_card(host, host->card->ocr, host->card);
1406 static const struct mmc_bus_ops mmc_sd_ops = {
1407 .remove = mmc_sd_remove,
1408 .detect = mmc_sd_detect,
1409 .runtime_suspend = mmc_sd_runtime_suspend,
1410 .runtime_resume = mmc_sd_runtime_resume,
1411 .suspend = mmc_sd_suspend,
1412 .resume = mmc_sd_resume,
1413 .alive = mmc_sd_alive,
1414 .change_bus_speed = mmc_sd_change_bus_speed,
1415 .reset = mmc_sd_reset,
1419 * Starting point for SD card init.
1421 int mmc_attach_sd(struct mmc_host *host)
1425 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1430 WARN_ON(!host->claimed);
1432 err = mmc_send_app_op_cond(host, 0, &ocr);
1436 mmc_attach_bus(host, &mmc_sd_ops);
1437 if (host->ocr_avail_sd)
1438 host->ocr_avail = host->ocr_avail_sd;
1441 * We need to get OCR a different way for SPI.
1443 if (mmc_host_is_spi(host)) {
1446 err = mmc_spi_read_ocr(host, 0, &ocr);
1451 rocr = mmc_select_voltage(host, ocr);
1454 * Can we support the voltage(s) of the card(s)?
1462 * Detect and init the card.
1464 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1467 err = mmc_sd_init_card(host, rocr, NULL);
1470 mmc_power_off(host);
1471 usleep_range(5000, 5500);
1472 mmc_power_up(host, rocr);
1473 mmc_select_voltage(host, rocr);
1480 printk(KERN_ERR "%s: mmc_sd_init_card() failure (err = %d)\n",
1481 mmc_hostname(host), err);
1485 err = mmc_sd_init_card(host, rocr, NULL);
1490 mmc_release_host(host);
1491 err = mmc_add_card(host->card);
1495 mmc_claim_host(host);
1497 err = mmc_init_clk_scaling(host);
1499 mmc_release_host(host);
1506 mmc_remove_card(host->card);
1508 mmc_claim_host(host);
1510 mmc_detach_bus(host);
1512 pr_err("%s: error %d whilst initialising SD card\n",
1513 mmc_hostname(host), err);