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];
341 * Test if the card supports high-speed mode and, if so, switch to it.
343 int mmc_sd_switch_hs(struct mmc_card *card)
348 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
351 if (!(card->csd.cmdclass & CCC_SWITCH))
354 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
357 if (card->sw_caps.hs_max_dtr == 0)
360 status = kmalloc(64, GFP_KERNEL);
362 pr_err("%s: could not allocate a buffer for "
363 "switch capabilities.\n", mmc_hostname(card->host));
367 err = mmc_sd_switch(card, 1, 0, 1, status);
371 if ((status[16] & 0xF) != 1) {
372 pr_warn("%s: Problem switching card into high-speed mode!\n",
373 mmc_hostname(card->host));
385 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
387 int card_drv_type, drive_strength, drv_type;
390 card->drive_strength = 0;
392 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
394 drive_strength = mmc_select_drive_strength(card,
395 card->sw_caps.uhs_max_dtr,
396 card_drv_type, &drv_type);
398 if (drive_strength) {
399 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
402 if ((status[15] & 0xF) != drive_strength) {
403 pr_warn("%s: Problem setting drive strength!\n",
404 mmc_hostname(card->host));
407 card->drive_strength = drive_strength;
411 mmc_set_driver_type(card->host, drv_type);
416 static void sd_update_bus_speed_mode(struct mmc_card *card)
419 * If the host doesn't support any of the UHS-I modes, fallback on
422 if (!mmc_host_uhs(card->host)) {
423 card->sd_bus_speed = 0;
427 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
428 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
429 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
430 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
431 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
432 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
433 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
434 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
435 SD_MODE_UHS_SDR50)) {
436 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
437 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
438 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
439 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
440 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
441 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
442 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
443 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
444 SD_MODE_UHS_SDR12)) {
445 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
449 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
452 unsigned int timing = 0;
454 switch (card->sd_bus_speed) {
455 case UHS_SDR104_BUS_SPEED:
456 timing = MMC_TIMING_UHS_SDR104;
457 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
459 case UHS_DDR50_BUS_SPEED:
460 timing = MMC_TIMING_UHS_DDR50;
461 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
463 case UHS_SDR50_BUS_SPEED:
464 timing = MMC_TIMING_UHS_SDR50;
465 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
467 case UHS_SDR25_BUS_SPEED:
468 timing = MMC_TIMING_UHS_SDR25;
469 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
471 case UHS_SDR12_BUS_SPEED:
472 timing = MMC_TIMING_UHS_SDR12;
473 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
479 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
483 if ((status[16] & 0xF) != card->sd_bus_speed)
484 pr_warn("%s: Problem setting bus speed mode!\n",
485 mmc_hostname(card->host));
487 mmc_set_timing(card->host, timing);
488 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
494 /* Get host's max current setting at its current voltage */
495 static u32 sd_get_host_max_current(struct mmc_host *host)
497 u32 voltage, max_current;
499 voltage = 1 << host->ios.vdd;
501 case MMC_VDD_165_195:
502 max_current = host->max_current_180;
506 max_current = host->max_current_300;
510 max_current = host->max_current_330;
519 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
521 int current_limit = SD_SET_CURRENT_NO_CHANGE;
526 * Current limit switch is only defined for SDR50, SDR104, and DDR50
527 * bus speed modes. For other bus speed modes, we do not change the
530 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
531 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
532 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
536 * Host has different current capabilities when operating at
537 * different voltages, so find out its max current first.
539 max_current = sd_get_host_max_current(card->host);
542 * We only check host's capability here, if we set a limit that is
543 * higher than the card's maximum current, the card will be using its
544 * maximum current, e.g. if the card's maximum current is 300ma, and
545 * when we set current limit to 200ma, the card will draw 200ma, and
546 * when we set current limit to 400/600/800ma, the card will draw its
547 * maximum 300ma from the host.
549 if (max_current >= 800)
550 current_limit = SD_SET_CURRENT_LIMIT_800;
551 else if (max_current >= 600)
552 current_limit = SD_SET_CURRENT_LIMIT_600;
553 else if (max_current >= 400)
554 current_limit = SD_SET_CURRENT_LIMIT_400;
555 else if (max_current >= 200)
556 current_limit = SD_SET_CURRENT_LIMIT_200;
558 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
559 err = mmc_sd_switch(card, 1, 3, current_limit, status);
563 if (((status[15] >> 4) & 0x0F) != current_limit)
564 pr_warn("%s: Problem setting current limit!\n",
565 mmc_hostname(card->host));
573 * UHS-I specific initialization procedure
575 static int mmc_sd_init_uhs_card(struct mmc_card *card)
580 if (!card->scr.sda_spec3)
583 if (!(card->csd.cmdclass & CCC_SWITCH))
586 status = kmalloc(64, GFP_KERNEL);
588 pr_err("%s: could not allocate a buffer for "
589 "switch capabilities.\n", mmc_hostname(card->host));
593 /* Set 4-bit bus width */
594 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
595 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
596 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
600 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
604 * Select the bus speed mode depending on host
605 * and card capability.
607 sd_update_bus_speed_mode(card);
609 /* Set the driver strength for the card */
610 err = sd_select_driver_type(card, status);
614 /* Set current limit for the card */
615 err = sd_set_current_limit(card, status);
619 /* Set bus speed mode of the card */
620 err = sd_set_bus_speed_mode(card, status);
625 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
626 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
628 if (!mmc_host_is_spi(card->host) &&
629 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED ||
630 card->sd_bus_speed == UHS_DDR50_BUS_SPEED ||
631 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) {
632 err = mmc_execute_tuning(card);
635 * As SD Specifications Part1 Physical Layer Specification
636 * Version 3.01 says, CMD19 tuning is available for unlocked
637 * cards in transfer state of 1.8V signaling mode. The small
638 * difference between v3.00 and 3.01 spec means that CMD19
639 * tuning is also available for DDR50 mode.
641 if (err && card->sd_bus_speed == UHS_DDR50_BUS_SPEED) {
642 pr_warn("%s: ddr50 tuning failed\n",
643 mmc_hostname(card->host));
654 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
655 card->raw_cid[2], card->raw_cid[3]);
656 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
657 card->raw_csd[2], card->raw_csd[3]);
658 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
659 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
660 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
661 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
662 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
663 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
664 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
665 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
666 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
667 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
670 static struct attribute *sd_std_attrs[] = {
675 &dev_attr_erase_size.attr,
676 &dev_attr_preferred_erase_size.attr,
677 &dev_attr_fwrev.attr,
678 &dev_attr_hwrev.attr,
679 &dev_attr_manfid.attr,
681 &dev_attr_oemid.attr,
682 &dev_attr_serial.attr,
685 ATTRIBUTE_GROUPS(sd_std);
687 struct device_type sd_type = {
688 .groups = sd_std_groups,
692 * Fetch CID from card.
694 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
704 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
708 * Since we're changing the OCR value, we seem to
709 * need to tell some cards to go back to the idle
710 * state. We wait 1ms to give cards time to
716 * If SD_SEND_IF_COND indicates an SD 2.0
717 * compliant card and we should set bit 30
718 * of the ocr to indicate that we can handle
719 * block-addressed SDHC cards.
721 err = mmc_send_if_cond(host, ocr);
726 * If the host supports one of UHS-I modes, request the card
727 * to switch to 1.8V signaling level. If the card has failed
728 * repeatedly to switch however, skip this.
730 if (retries && mmc_host_uhs(host))
734 * If the host can supply more than 150mA at current voltage,
735 * XPC should be set to 1.
737 max_current = sd_get_host_max_current(host);
738 if (max_current > 150)
741 err = mmc_send_app_op_cond(host, ocr, rocr);
746 * In case CCS and S18A in the response is set, start Signal Voltage
747 * Switch procedure. SPI mode doesn't support CMD11.
749 if (!mmc_host_is_spi(host) && rocr &&
750 ((*rocr & 0x41000000) == 0x41000000)) {
751 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
753 if (err == -EAGAIN) {
762 if (mmc_host_is_spi(host))
763 err = mmc_send_cid(host, cid);
765 err = mmc_all_send_cid(host, cid);
770 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
775 * Fetch CSD from card.
777 err = mmc_send_csd(card, card->raw_csd);
781 err = mmc_decode_csd(card);
788 static int mmc_sd_get_ro(struct mmc_host *host)
793 * Some systems don't feature a write-protect pin and don't need one.
794 * E.g. because they only have micro-SD card slot. For those systems
795 * assume that the SD card is always read-write.
797 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
800 if (!host->ops->get_ro)
803 ro = host->ops->get_ro(host);
808 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
815 * Fetch SCR from card.
817 err = mmc_app_send_scr(card, card->raw_scr);
821 err = mmc_decode_scr(card);
826 * Fetch and process SD Status register.
828 err = mmc_read_ssr(card);
832 /* Erase init depends on CSD and SSR */
833 mmc_init_erase(card);
836 * Fetch switch information from card.
838 err = mmc_read_switch(card);
844 * For SPI, enable CRC as appropriate.
845 * This CRC enable is located AFTER the reading of the
846 * card registers because some SDHC cards are not able
847 * to provide valid CRCs for non-512-byte blocks.
849 if (mmc_host_is_spi(host)) {
850 err = mmc_spi_set_crc(host, use_spi_crc);
856 * Check if read-only switch is active.
859 int ro = mmc_sd_get_ro(host);
862 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
865 mmc_card_set_readonly(card);
872 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
874 unsigned max_dtr = (unsigned int)-1;
876 if (mmc_card_hs(card)) {
877 if (max_dtr > card->sw_caps.hs_max_dtr)
878 max_dtr = card->sw_caps.hs_max_dtr;
879 } else if (max_dtr > card->csd.max_dtr) {
880 max_dtr = card->csd.max_dtr;
887 * Handle the detection and initialisation of a card.
889 * In the case of a resume, "oldcard" will contain the card
890 * we're trying to reinitialise.
892 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
893 struct mmc_card *oldcard)
895 struct mmc_card *card;
901 WARN_ON(!host->claimed);
903 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
908 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
914 * Allocate card structure.
916 card = mmc_alloc_card(host, &sd_type);
918 return PTR_ERR(card);
921 card->type = MMC_TYPE_SD;
922 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
926 * Call the optional HC's init_card function to handle quirks.
928 if (host->ops->init_card)
929 host->ops->init_card(host, card);
932 * For native busses: get card RCA and quit open drain mode.
934 if (!mmc_host_is_spi(host)) {
935 err = mmc_send_relative_addr(host, &card->rca);
941 err = mmc_sd_get_csd(host, card);
945 mmc_decode_cid(card);
949 * handling only for cards supporting DSR and hosts requesting
952 if (card->csd.dsr_imp && host->dsr_req)
956 * Select card, as all following commands rely on that.
958 if (!mmc_host_is_spi(host)) {
959 err = mmc_select_card(card);
964 err = mmc_sd_setup_card(host, card, oldcard != NULL);
968 /* Initialization sequence for UHS-I cards */
969 if (rocr & SD_ROCR_S18A) {
970 err = mmc_sd_init_uhs_card(card);
975 * Attempt to change to high-speed (if supported)
977 err = mmc_sd_switch_hs(card);
979 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
986 mmc_set_clock(host, mmc_sd_get_max_clock(card));
989 * Switch to wider bus (if supported).
991 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
992 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
993 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
997 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1006 mmc_remove_card(card);
1012 * Host is being removed. Free up the current card.
1014 static void mmc_sd_remove(struct mmc_host *host)
1017 BUG_ON(!host->card);
1019 mmc_remove_card(host->card);
1024 * Card detection - card is alive.
1026 static int mmc_sd_alive(struct mmc_host *host)
1028 return mmc_send_status(host->card, NULL);
1032 * Card detection callback from host.
1034 static void mmc_sd_detect(struct mmc_host *host)
1039 BUG_ON(!host->card);
1041 mmc_get_card(host->card);
1044 * Just check if our card has been removed.
1046 err = _mmc_detect_card_removed(host);
1048 mmc_put_card(host->card);
1051 mmc_sd_remove(host);
1053 mmc_claim_host(host);
1054 mmc_detach_bus(host);
1055 mmc_power_off(host);
1056 mmc_release_host(host);
1060 static int _mmc_sd_suspend(struct mmc_host *host)
1065 BUG_ON(!host->card);
1067 mmc_claim_host(host);
1069 if (mmc_card_suspended(host->card))
1072 if (!mmc_host_is_spi(host))
1073 err = mmc_deselect_cards(host);
1076 mmc_power_off(host);
1077 mmc_card_set_suspended(host->card);
1081 mmc_release_host(host);
1086 * Callback for suspend
1088 static int mmc_sd_suspend(struct mmc_host *host)
1092 err = _mmc_sd_suspend(host);
1094 pm_runtime_disable(&host->card->dev);
1095 pm_runtime_set_suspended(&host->card->dev);
1102 * This function tries to determine if the same card is still present
1103 * and, if so, restore all state to it.
1105 static int _mmc_sd_resume(struct mmc_host *host)
1110 BUG_ON(!host->card);
1112 mmc_claim_host(host);
1114 if (!mmc_card_suspended(host->card))
1117 mmc_power_up(host, host->card->ocr);
1118 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1119 mmc_card_clr_suspended(host->card);
1122 mmc_release_host(host);
1127 * Callback for resume
1129 static int mmc_sd_resume(struct mmc_host *host)
1133 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1134 err = _mmc_sd_resume(host);
1135 pm_runtime_set_active(&host->card->dev);
1136 pm_runtime_mark_last_busy(&host->card->dev);
1138 pm_runtime_enable(&host->card->dev);
1144 * Callback for runtime_suspend.
1146 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1150 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1153 err = _mmc_sd_suspend(host);
1155 pr_err("%s: error %d doing aggressive suspend\n",
1156 mmc_hostname(host), err);
1162 * Callback for runtime_resume.
1164 static int mmc_sd_runtime_resume(struct mmc_host *host)
1168 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1171 err = _mmc_sd_resume(host);
1173 pr_err("%s: error %d doing aggressive resume\n",
1174 mmc_hostname(host), err);
1179 static int mmc_sd_reset(struct mmc_host *host)
1181 mmc_power_cycle(host, host->card->ocr);
1182 return mmc_sd_init_card(host, host->card->ocr, host->card);
1185 static const struct mmc_bus_ops mmc_sd_ops = {
1186 .remove = mmc_sd_remove,
1187 .detect = mmc_sd_detect,
1188 .runtime_suspend = mmc_sd_runtime_suspend,
1189 .runtime_resume = mmc_sd_runtime_resume,
1190 .suspend = mmc_sd_suspend,
1191 .resume = mmc_sd_resume,
1192 .alive = mmc_sd_alive,
1193 .shutdown = mmc_sd_suspend,
1194 .reset = mmc_sd_reset,
1198 * Starting point for SD card init.
1200 int mmc_attach_sd(struct mmc_host *host)
1206 WARN_ON(!host->claimed);
1208 err = mmc_send_app_op_cond(host, 0, &ocr);
1212 mmc_attach_bus(host, &mmc_sd_ops);
1213 if (host->ocr_avail_sd)
1214 host->ocr_avail = host->ocr_avail_sd;
1217 * We need to get OCR a different way for SPI.
1219 if (mmc_host_is_spi(host)) {
1222 err = mmc_spi_read_ocr(host, 0, &ocr);
1227 rocr = mmc_select_voltage(host, ocr);
1230 * Can we support the voltage(s) of the card(s)?
1238 * Detect and init the card.
1240 err = mmc_sd_init_card(host, rocr, NULL);
1244 mmc_release_host(host);
1245 err = mmc_add_card(host->card);
1249 mmc_claim_host(host);
1253 mmc_remove_card(host->card);
1255 mmc_claim_host(host);
1257 mmc_detach_bus(host);
1259 pr_err("%s: error %d whilst initialising SD card\n",
1260 mmc_hostname(host), err);