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 static const unsigned int tran_exp[] = {
31 10000, 100000, 1000000, 10000000,
35 static const unsigned char tran_mant[] = {
36 0, 10, 12, 13, 15, 20, 25, 30,
37 35, 40, 45, 50, 55, 60, 70, 80,
40 static const unsigned int tacc_exp[] = {
41 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
44 static const unsigned int tacc_mant[] = {
45 0, 10, 12, 13, 15, 20, 25, 30,
46 35, 40, 45, 50, 55, 60, 70, 80,
49 static const unsigned int sd_au_size[] = {
50 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
51 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
52 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
53 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
56 #define UNSTUFF_BITS(resp,start,size) \
58 const int __size = size; \
59 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
60 const int __off = 3 - ((start) / 32); \
61 const int __shft = (start) & 31; \
64 __res = resp[__off] >> __shft; \
65 if (__size + __shft > 32) \
66 __res |= resp[__off-1] << ((32 - __shft) % 32); \
71 * Given the decoded CSD structure, decode the raw CID to our CID structure.
73 void mmc_decode_cid(struct mmc_card *card)
75 u32 *resp = card->raw_cid;
77 memset(&card->cid, 0, sizeof(struct mmc_cid));
80 * SD doesn't currently have a version field so we will
81 * have to assume we can parse this.
83 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
84 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
85 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
86 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
87 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
88 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
89 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
90 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
91 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
92 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
93 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
94 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
96 card->cid.year += 2000; /* SD cards year offset */
100 * Given a 128-bit response, decode to our card CSD structure.
102 static int mmc_decode_csd(struct mmc_card *card)
104 struct mmc_csd *csd = &card->csd;
105 unsigned int e, m, csd_struct;
106 u32 *resp = card->raw_csd;
108 csd_struct = UNSTUFF_BITS(resp, 126, 2);
110 switch (csd_struct) {
112 m = UNSTUFF_BITS(resp, 115, 4);
113 e = UNSTUFF_BITS(resp, 112, 3);
114 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
115 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
117 m = UNSTUFF_BITS(resp, 99, 4);
118 e = UNSTUFF_BITS(resp, 96, 3);
119 csd->max_dtr = tran_exp[e] * tran_mant[m];
120 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
122 e = UNSTUFF_BITS(resp, 47, 3);
123 m = UNSTUFF_BITS(resp, 62, 12);
124 csd->capacity = (1 + m) << (e + 2);
126 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
127 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
128 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
129 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
130 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
131 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
132 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
133 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
135 if (UNSTUFF_BITS(resp, 46, 1)) {
137 } else if (csd->write_blkbits >= 9) {
138 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
139 csd->erase_size <<= csd->write_blkbits - 9;
144 * This is a block-addressed SDHC or SDXC card. Most
145 * interesting fields are unused and have fixed
146 * values. To avoid getting tripped by buggy cards,
147 * we assume those fixed values ourselves.
149 mmc_card_set_blockaddr(card);
151 csd->tacc_ns = 0; /* Unused */
152 csd->tacc_clks = 0; /* Unused */
154 m = UNSTUFF_BITS(resp, 99, 4);
155 e = UNSTUFF_BITS(resp, 96, 3);
156 csd->max_dtr = tran_exp[e] * tran_mant[m];
157 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
158 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
160 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
161 if (csd->c_size >= 0xFFFF)
162 mmc_card_set_ext_capacity(card);
164 m = UNSTUFF_BITS(resp, 48, 22);
165 csd->capacity = (1 + m) << 10;
167 csd->read_blkbits = 9;
168 csd->read_partial = 0;
169 csd->write_misalign = 0;
170 csd->read_misalign = 0;
171 csd->r2w_factor = 4; /* Unused */
172 csd->write_blkbits = 9;
173 csd->write_partial = 0;
177 pr_err("%s: unrecognised CSD structure version %d\n",
178 mmc_hostname(card->host), csd_struct);
182 card->erase_size = csd->erase_size;
188 * Given a 64-bit response, decode to our card SCR structure.
190 static int mmc_decode_scr(struct mmc_card *card)
192 struct sd_scr *scr = &card->scr;
193 unsigned int scr_struct;
196 resp[3] = card->raw_scr[1];
197 resp[2] = card->raw_scr[0];
199 scr_struct = UNSTUFF_BITS(resp, 60, 4);
200 if (scr_struct != 0) {
201 pr_err("%s: unrecognised SCR structure version %d\n",
202 mmc_hostname(card->host), scr_struct);
206 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
207 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
208 if (scr->sda_vsn == SCR_SPEC_VER_2)
209 /* Check if Physical Layer Spec v3.0 is supported */
210 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
212 if (UNSTUFF_BITS(resp, 55, 1))
213 card->erased_byte = 0xFF;
215 card->erased_byte = 0x0;
218 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
223 * Fetch and process SD Status register.
225 static int mmc_read_ssr(struct mmc_card *card)
227 unsigned int au, es, et, eo;
231 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
232 pr_warn("%s: card lacks mandatory SD Status function\n",
233 mmc_hostname(card->host));
237 ssr = kmalloc(64, GFP_KERNEL);
241 err = mmc_app_sd_status(card, ssr);
243 pr_warn("%s: problem reading SD Status register\n",
244 mmc_hostname(card->host));
249 for (i = 0; i < 16; i++)
250 ssr[i] = be32_to_cpu(ssr[i]);
253 * UNSTUFF_BITS only works with four u32s so we have to offset the
254 * bitfield positions accordingly.
256 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
258 if (au <= 9 || card->scr.sda_spec3) {
259 card->ssr.au = sd_au_size[au];
260 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
261 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
263 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
264 card->ssr.erase_timeout = (et * 1000) / es;
265 card->ssr.erase_offset = eo * 1000;
268 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
269 mmc_hostname(card->host));
278 * Fetches and decodes switch information
280 static int mmc_read_switch(struct mmc_card *card)
285 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
288 if (!(card->csd.cmdclass & CCC_SWITCH)) {
289 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
290 mmc_hostname(card->host));
296 status = kmalloc(64, GFP_KERNEL);
298 pr_err("%s: could not allocate a buffer for "
299 "switch capabilities.\n",
300 mmc_hostname(card->host));
305 * Find out the card's support bits with a mode 0 operation.
306 * The argument does not matter, as the support bits do not
307 * change with the arguments.
309 err = mmc_sd_switch(card, 0, 0, 0, status);
312 * If the host or the card can't do the switch,
313 * fail more gracefully.
315 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
318 pr_warn("%s: problem reading Bus Speed modes\n",
319 mmc_hostname(card->host));
325 if (status[13] & SD_MODE_HIGH_SPEED)
326 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
328 if (card->scr.sda_spec3) {
329 card->sw_caps.sd3_bus_mode = status[13];
330 /* Driver Strengths supported by the card */
331 card->sw_caps.sd3_drv_type = status[9];
332 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
342 * Test if the card supports high-speed mode and, if so, switch to it.
344 int mmc_sd_switch_hs(struct mmc_card *card)
349 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
352 if (!(card->csd.cmdclass & CCC_SWITCH))
355 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
358 if (card->sw_caps.hs_max_dtr == 0)
361 status = kmalloc(64, GFP_KERNEL);
363 pr_err("%s: could not allocate a buffer for "
364 "switch capabilities.\n", mmc_hostname(card->host));
368 err = mmc_sd_switch(card, 1, 0, 1, status);
372 if ((status[16] & 0xF) != 1) {
373 pr_warn("%s: Problem switching card into high-speed mode!\n",
374 mmc_hostname(card->host));
386 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
388 int card_drv_type, drive_strength, drv_type;
391 card->drive_strength = 0;
393 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
395 drive_strength = mmc_select_drive_strength(card,
396 card->sw_caps.uhs_max_dtr,
397 card_drv_type, &drv_type);
399 if (drive_strength) {
400 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
403 if ((status[15] & 0xF) != drive_strength) {
404 pr_warn("%s: Problem setting drive strength!\n",
405 mmc_hostname(card->host));
408 card->drive_strength = drive_strength;
412 mmc_set_driver_type(card->host, drv_type);
417 static void sd_update_bus_speed_mode(struct mmc_card *card)
420 * If the host doesn't support any of the UHS-I modes, fallback on
423 if (!mmc_host_uhs(card->host)) {
424 card->sd_bus_speed = 0;
428 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
429 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
430 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
431 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
432 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
433 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
434 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
435 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
436 SD_MODE_UHS_SDR50)) {
437 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
438 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
439 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
440 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
441 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
442 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
443 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
444 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
445 SD_MODE_UHS_SDR12)) {
446 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
450 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
453 unsigned int timing = 0;
455 switch (card->sd_bus_speed) {
456 case UHS_SDR104_BUS_SPEED:
457 timing = MMC_TIMING_UHS_SDR104;
458 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
460 case UHS_DDR50_BUS_SPEED:
461 timing = MMC_TIMING_UHS_DDR50;
462 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
464 case UHS_SDR50_BUS_SPEED:
465 timing = MMC_TIMING_UHS_SDR50;
466 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
468 case UHS_SDR25_BUS_SPEED:
469 timing = MMC_TIMING_UHS_SDR25;
470 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
472 case UHS_SDR12_BUS_SPEED:
473 timing = MMC_TIMING_UHS_SDR12;
474 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
480 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
484 if ((status[16] & 0xF) != card->sd_bus_speed)
485 pr_warn("%s: Problem setting bus speed mode!\n",
486 mmc_hostname(card->host));
488 mmc_set_timing(card->host, timing);
489 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
495 /* Get host's max current setting at its current voltage */
496 static u32 sd_get_host_max_current(struct mmc_host *host)
498 u32 voltage, max_current;
500 voltage = 1 << host->ios.vdd;
502 case MMC_VDD_165_195:
503 max_current = host->max_current_180;
507 max_current = host->max_current_300;
511 max_current = host->max_current_330;
520 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
522 int current_limit = SD_SET_CURRENT_NO_CHANGE;
527 * Current limit switch is only defined for SDR50, SDR104, and DDR50
528 * bus speed modes. For other bus speed modes, we do not change the
531 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
532 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
533 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
537 * Host has different current capabilities when operating at
538 * different voltages, so find out its max current first.
540 max_current = sd_get_host_max_current(card->host);
543 * We only check host's capability here, if we set a limit that is
544 * higher than the card's maximum current, the card will be using its
545 * maximum current, e.g. if the card's maximum current is 300ma, and
546 * when we set current limit to 200ma, the card will draw 200ma, and
547 * when we set current limit to 400/600/800ma, the card will draw its
548 * maximum 300ma from the host.
550 * The above is incorrect: if we try to set a current limit that is
551 * not supported by the card, the card can rightfully error out the
552 * attempt, and remain at the default current limit. This results
553 * in a 300mA card being limited to 200mA even though the host
554 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
555 * an iMX6 host. --rmk
557 if (max_current >= 800 &&
558 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
559 current_limit = SD_SET_CURRENT_LIMIT_800;
560 else if (max_current >= 600 &&
561 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
562 current_limit = SD_SET_CURRENT_LIMIT_600;
563 else if (max_current >= 400 &&
564 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
565 current_limit = SD_SET_CURRENT_LIMIT_400;
566 else if (max_current >= 200 &&
567 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
568 current_limit = SD_SET_CURRENT_LIMIT_200;
570 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
571 err = mmc_sd_switch(card, 1, 3, current_limit, status);
575 if (((status[15] >> 4) & 0x0F) != current_limit)
576 pr_warn("%s: Problem setting current limit!\n",
577 mmc_hostname(card->host));
585 * UHS-I specific initialization procedure
587 static int mmc_sd_init_uhs_card(struct mmc_card *card)
592 if (!card->scr.sda_spec3)
595 if (!(card->csd.cmdclass & CCC_SWITCH))
598 status = kmalloc(64, GFP_KERNEL);
600 pr_err("%s: could not allocate a buffer for "
601 "switch capabilities.\n", mmc_hostname(card->host));
605 /* Set 4-bit bus width */
606 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
607 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
608 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
612 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
616 * Select the bus speed mode depending on host
617 * and card capability.
619 sd_update_bus_speed_mode(card);
621 /* Set the driver strength for the card */
622 err = sd_select_driver_type(card, status);
626 /* Set current limit for the card */
627 err = sd_set_current_limit(card, status);
631 /* Set bus speed mode of the card */
632 err = sd_set_bus_speed_mode(card, status);
637 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
638 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
640 if (!mmc_host_is_spi(card->host) &&
641 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
642 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
643 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
644 err = mmc_execute_tuning(card);
647 * As SD Specifications Part1 Physical Layer Specification
648 * Version 3.01 says, CMD19 tuning is available for unlocked
649 * cards in transfer state of 1.8V signaling mode. The small
650 * difference between v3.00 and 3.01 spec means that CMD19
651 * tuning is also available for DDR50 mode.
653 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
654 pr_warn("%s: ddr50 tuning failed\n",
655 mmc_hostname(card->host));
666 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
667 card->raw_cid[2], card->raw_cid[3]);
668 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
669 card->raw_csd[2], card->raw_csd[3]);
670 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
671 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
672 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
673 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
674 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
675 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
676 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
677 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
678 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
679 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
682 static struct attribute *sd_std_attrs[] = {
687 &dev_attr_erase_size.attr,
688 &dev_attr_preferred_erase_size.attr,
689 &dev_attr_fwrev.attr,
690 &dev_attr_hwrev.attr,
691 &dev_attr_manfid.attr,
693 &dev_attr_oemid.attr,
694 &dev_attr_serial.attr,
697 ATTRIBUTE_GROUPS(sd_std);
699 struct device_type sd_type = {
700 .groups = sd_std_groups,
704 * Fetch CID from card.
706 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
716 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
720 * Since we're changing the OCR value, we seem to
721 * need to tell some cards to go back to the idle
722 * state. We wait 1ms to give cards time to
728 * If SD_SEND_IF_COND indicates an SD 2.0
729 * compliant card and we should set bit 30
730 * of the ocr to indicate that we can handle
731 * block-addressed SDHC cards.
733 err = mmc_send_if_cond(host, ocr);
738 * If the host supports one of UHS-I modes, request the card
739 * to switch to 1.8V signaling level. If the card has failed
740 * repeatedly to switch however, skip this.
742 if (retries && mmc_host_uhs(host))
746 * If the host can supply more than 150mA at current voltage,
747 * XPC should be set to 1.
749 max_current = sd_get_host_max_current(host);
750 if (max_current > 150)
753 err = mmc_send_app_op_cond(host, ocr, rocr);
758 * In case CCS and S18A in the response is set, start Signal Voltage
759 * Switch procedure. SPI mode doesn't support CMD11.
761 if (!mmc_host_is_spi(host) && rocr &&
762 ((*rocr & 0x41000000) == 0x41000000)) {
763 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
765 if (err == -EAGAIN) {
774 if (mmc_host_is_spi(host))
775 err = mmc_send_cid(host, cid);
777 err = mmc_all_send_cid(host, cid);
782 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
787 * Fetch CSD from card.
789 err = mmc_send_csd(card, card->raw_csd);
793 err = mmc_decode_csd(card);
800 static int mmc_sd_get_ro(struct mmc_host *host)
805 * Some systems don't feature a write-protect pin and don't need one.
806 * E.g. because they only have micro-SD card slot. For those systems
807 * assume that the SD card is always read-write.
809 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
812 if (!host->ops->get_ro)
815 ro = host->ops->get_ro(host);
820 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
827 * Fetch SCR from card.
829 err = mmc_app_send_scr(card, card->raw_scr);
833 err = mmc_decode_scr(card);
838 * Fetch and process SD Status register.
840 err = mmc_read_ssr(card);
844 /* Erase init depends on CSD and SSR */
845 mmc_init_erase(card);
848 * Fetch switch information from card.
850 err = mmc_read_switch(card);
856 * For SPI, enable CRC as appropriate.
857 * This CRC enable is located AFTER the reading of the
858 * card registers because some SDHC cards are not able
859 * to provide valid CRCs for non-512-byte blocks.
861 if (mmc_host_is_spi(host)) {
862 err = mmc_spi_set_crc(host, use_spi_crc);
868 * Check if read-only switch is active.
871 int ro = mmc_sd_get_ro(host);
874 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
877 mmc_card_set_readonly(card);
884 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
886 unsigned max_dtr = (unsigned int)-1;
888 if (mmc_card_hs(card)) {
889 if (max_dtr > card->sw_caps.hs_max_dtr)
890 max_dtr = card->sw_caps.hs_max_dtr;
891 } else if (max_dtr > card->csd.max_dtr) {
892 max_dtr = card->csd.max_dtr;
899 * Handle the detection and initialisation of a card.
901 * In the case of a resume, "oldcard" will contain the card
902 * we're trying to reinitialise.
904 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
905 struct mmc_card *oldcard)
907 struct mmc_card *card;
913 WARN_ON(!host->claimed);
915 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
920 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
926 * Allocate card structure.
928 card = mmc_alloc_card(host, &sd_type);
930 return PTR_ERR(card);
933 card->type = MMC_TYPE_SD;
934 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
938 * Call the optional HC's init_card function to handle quirks.
940 if (host->ops->init_card)
941 host->ops->init_card(host, card);
944 * For native busses: get card RCA and quit open drain mode.
946 if (!mmc_host_is_spi(host)) {
947 err = mmc_send_relative_addr(host, &card->rca);
953 err = mmc_sd_get_csd(host, card);
957 mmc_decode_cid(card);
961 * handling only for cards supporting DSR and hosts requesting
964 if (card->csd.dsr_imp && host->dsr_req)
968 * Select card, as all following commands rely on that.
970 if (!mmc_host_is_spi(host)) {
971 err = mmc_select_card(card);
976 err = mmc_sd_setup_card(host, card, oldcard != NULL);
980 /* Initialization sequence for UHS-I cards */
981 if (rocr & SD_ROCR_S18A) {
982 err = mmc_sd_init_uhs_card(card);
987 * Attempt to change to high-speed (if supported)
989 err = mmc_sd_switch_hs(card);
991 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
998 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1001 * Switch to wider bus (if supported).
1003 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1004 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1005 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1009 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1018 mmc_remove_card(card);
1024 * Host is being removed. Free up the current card.
1026 static void mmc_sd_remove(struct mmc_host *host)
1029 BUG_ON(!host->card);
1031 mmc_remove_card(host->card);
1036 * Card detection - card is alive.
1038 static int mmc_sd_alive(struct mmc_host *host)
1040 return mmc_send_status(host->card, NULL);
1044 * Card detection callback from host.
1046 static void mmc_sd_detect(struct mmc_host *host)
1051 BUG_ON(!host->card);
1053 mmc_get_card(host->card);
1056 * Just check if our card has been removed.
1058 err = _mmc_detect_card_removed(host);
1060 mmc_put_card(host->card);
1063 mmc_sd_remove(host);
1065 mmc_claim_host(host);
1066 mmc_detach_bus(host);
1067 mmc_power_off(host);
1068 mmc_release_host(host);
1072 static int _mmc_sd_suspend(struct mmc_host *host)
1077 BUG_ON(!host->card);
1079 mmc_claim_host(host);
1081 if (mmc_card_suspended(host->card))
1084 if (!mmc_host_is_spi(host))
1085 err = mmc_deselect_cards(host);
1088 mmc_power_off(host);
1089 mmc_card_set_suspended(host->card);
1093 mmc_release_host(host);
1098 * Callback for suspend
1100 static int mmc_sd_suspend(struct mmc_host *host)
1104 err = _mmc_sd_suspend(host);
1106 pm_runtime_disable(&host->card->dev);
1107 pm_runtime_set_suspended(&host->card->dev);
1114 * This function tries to determine if the same card is still present
1115 * and, if so, restore all state to it.
1117 static int _mmc_sd_resume(struct mmc_host *host)
1122 BUG_ON(!host->card);
1124 mmc_claim_host(host);
1126 if (!mmc_card_suspended(host->card))
1129 mmc_power_up(host, host->card->ocr);
1130 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1131 mmc_card_clr_suspended(host->card);
1134 mmc_release_host(host);
1139 * Callback for resume
1141 static int mmc_sd_resume(struct mmc_host *host)
1143 pm_runtime_enable(&host->card->dev);
1148 * Callback for runtime_suspend.
1150 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1154 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1157 err = _mmc_sd_suspend(host);
1159 pr_err("%s: error %d doing aggressive suspend\n",
1160 mmc_hostname(host), err);
1166 * Callback for runtime_resume.
1168 static int mmc_sd_runtime_resume(struct mmc_host *host)
1172 err = _mmc_sd_resume(host);
1173 if (err && err != -ENOMEDIUM)
1174 pr_err("%s: error %d doing runtime resume\n",
1175 mmc_hostname(host), err);
1180 static int mmc_sd_reset(struct mmc_host *host)
1182 mmc_power_cycle(host, host->card->ocr);
1183 return mmc_sd_init_card(host, host->card->ocr, host->card);
1186 static const struct mmc_bus_ops mmc_sd_ops = {
1187 .remove = mmc_sd_remove,
1188 .detect = mmc_sd_detect,
1189 .runtime_suspend = mmc_sd_runtime_suspend,
1190 .runtime_resume = mmc_sd_runtime_resume,
1191 .suspend = mmc_sd_suspend,
1192 .resume = mmc_sd_resume,
1193 .alive = mmc_sd_alive,
1194 .shutdown = mmc_sd_suspend,
1195 .reset = mmc_sd_reset,
1199 * Starting point for SD card init.
1201 int mmc_attach_sd(struct mmc_host *host)
1207 WARN_ON(!host->claimed);
1209 err = mmc_send_app_op_cond(host, 0, &ocr);
1213 mmc_attach_bus(host, &mmc_sd_ops);
1214 if (host->ocr_avail_sd)
1215 host->ocr_avail = host->ocr_avail_sd;
1218 * We need to get OCR a different way for SPI.
1220 if (mmc_host_is_spi(host)) {
1223 err = mmc_spi_read_ocr(host, 0, &ocr);
1228 rocr = mmc_select_voltage(host, ocr);
1231 * Can we support the voltage(s) of the card(s)?
1239 * Detect and init the card.
1241 err = mmc_sd_init_card(host, rocr, NULL);
1245 mmc_release_host(host);
1246 err = mmc_add_card(host->card);
1250 mmc_claim_host(host);
1254 mmc_remove_card(host->card);
1256 mmc_claim_host(host);
1258 mmc_detach_bus(host);
1260 pr_err("%s: error %d whilst initialising SD card\n",
1261 mmc_hostname(host), err);