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>
32 static const unsigned int tran_exp[] = {
33 10000, 100000, 1000000, 10000000,
37 static const unsigned char tran_mant[] = {
38 0, 10, 12, 13, 15, 20, 25, 30,
39 35, 40, 45, 50, 55, 60, 70, 80,
42 static const unsigned int taac_exp[] = {
43 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
46 static const unsigned int taac_mant[] = {
47 0, 10, 12, 13, 15, 20, 25, 30,
48 35, 40, 45, 50, 55, 60, 70, 80,
51 static 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,
58 #define UNSTUFF_BITS(resp,start,size) \
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; \
66 __res = resp[__off] >> __shft; \
67 if (__size + __shft > 32) \
68 __res |= resp[__off-1] << ((32 - __shft) % 32); \
73 * Given the decoded CSD structure, decode the raw CID to our CID structure.
75 void mmc_decode_cid(struct mmc_card *card)
77 u32 *resp = card->raw_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->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10;
115 csd->taac_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->taac_ns = 0; /* Unused */
152 csd->taac_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 (scr->sda_spec3) {
213 scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1);
214 scr->sda_specx = UNSTUFF_BITS(resp, 38, 4);
217 if (UNSTUFF_BITS(resp, 55, 1))
218 card->erased_byte = 0xFF;
220 card->erased_byte = 0x0;
223 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
225 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */
226 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
227 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
228 pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
236 * Fetch and process SD Status register.
238 static int mmc_read_ssr(struct mmc_card *card)
240 unsigned int au, es, et, eo;
246 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
247 pr_warn("%s: card lacks mandatory SD Status function\n",
248 mmc_hostname(card->host));
252 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
256 if (mmc_app_sd_status(card, raw_ssr)) {
257 pr_warn("%s: problem reading SD Status register\n",
258 mmc_hostname(card->host));
263 for (i = 0; i < 16; i++)
264 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
269 * UNSTUFF_BITS only works with four u32s so we have to offset the
270 * bitfield positions accordingly.
272 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
274 if (au <= 9 || card->scr.sda_spec3) {
275 card->ssr.au = sd_au_size[au];
276 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
277 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
279 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
280 card->ssr.erase_timeout = (et * 1000) / es;
281 card->ssr.erase_offset = eo * 1000;
284 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
285 mmc_hostname(card->host));
290 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set
292 resp[3] = card->raw_ssr[6];
293 discard_support = UNSTUFF_BITS(resp, 313 - 288, 1);
294 card->erase_arg = (card->scr.sda_specx && discard_support) ?
295 SD_DISCARD_ARG : SD_ERASE_ARG;
301 * Fetches and decodes switch information
303 static int mmc_read_switch(struct mmc_card *card)
308 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
311 if (!(card->csd.cmdclass & CCC_SWITCH)) {
312 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
313 mmc_hostname(card->host));
317 status = kmalloc(64, GFP_KERNEL);
322 * Find out the card's support bits with a mode 0 operation.
323 * The argument does not matter, as the support bits do not
324 * change with the arguments.
326 err = mmc_sd_switch(card, 0, 0, 0, status);
329 * If the host or the card can't do the switch,
330 * fail more gracefully.
332 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
335 pr_warn("%s: problem reading Bus Speed modes\n",
336 mmc_hostname(card->host));
342 if (status[13] & SD_MODE_HIGH_SPEED)
343 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
345 if (card->scr.sda_spec3) {
346 card->sw_caps.sd3_bus_mode = status[13];
347 /* Driver Strengths supported by the card */
348 card->sw_caps.sd3_drv_type = status[9];
349 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
359 * Test if the card supports high-speed mode and, if so, switch to it.
361 int mmc_sd_switch_hs(struct mmc_card *card)
366 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
369 if (!(card->csd.cmdclass & CCC_SWITCH))
372 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
375 if (card->sw_caps.hs_max_dtr == 0)
378 status = kmalloc(64, GFP_KERNEL);
382 err = mmc_sd_switch(card, 1, 0, 1, status);
386 if ((status[16] & 0xF) != 1) {
387 pr_warn("%s: Problem switching card into high-speed mode!\n",
388 mmc_hostname(card->host));
400 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
402 int card_drv_type, drive_strength, drv_type;
405 card->drive_strength = 0;
407 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
409 drive_strength = mmc_select_drive_strength(card,
410 card->sw_caps.uhs_max_dtr,
411 card_drv_type, &drv_type);
413 if (drive_strength) {
414 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
417 if ((status[15] & 0xF) != drive_strength) {
418 pr_warn("%s: Problem setting drive strength!\n",
419 mmc_hostname(card->host));
422 card->drive_strength = drive_strength;
426 mmc_set_driver_type(card->host, drv_type);
431 static void sd_update_bus_speed_mode(struct mmc_card *card)
434 * If the host doesn't support any of the UHS-I modes, fallback on
437 if (!mmc_host_uhs(card->host)) {
438 card->sd_bus_speed = 0;
442 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
443 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
444 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
445 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
446 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
447 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
448 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
449 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
450 SD_MODE_UHS_SDR50)) {
451 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
452 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
453 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
454 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
455 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
456 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
457 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
458 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
459 SD_MODE_UHS_SDR12)) {
460 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
464 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
467 unsigned int timing = 0;
469 switch (card->sd_bus_speed) {
470 case UHS_SDR104_BUS_SPEED:
471 timing = MMC_TIMING_UHS_SDR104;
472 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
474 case UHS_DDR50_BUS_SPEED:
475 timing = MMC_TIMING_UHS_DDR50;
476 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
478 case UHS_SDR50_BUS_SPEED:
479 timing = MMC_TIMING_UHS_SDR50;
480 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
482 case UHS_SDR25_BUS_SPEED:
483 timing = MMC_TIMING_UHS_SDR25;
484 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
486 case UHS_SDR12_BUS_SPEED:
487 timing = MMC_TIMING_UHS_SDR12;
488 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
494 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
498 if ((status[16] & 0xF) != card->sd_bus_speed)
499 pr_warn("%s: Problem setting bus speed mode!\n",
500 mmc_hostname(card->host));
502 mmc_set_timing(card->host, timing);
503 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
509 /* Get host's max current setting at its current voltage */
510 static u32 sd_get_host_max_current(struct mmc_host *host)
512 u32 voltage, max_current;
514 voltage = 1 << host->ios.vdd;
516 case MMC_VDD_165_195:
517 max_current = host->max_current_180;
521 max_current = host->max_current_300;
525 max_current = host->max_current_330;
534 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
536 int current_limit = SD_SET_CURRENT_NO_CHANGE;
541 * Current limit switch is only defined for SDR50, SDR104, and DDR50
542 * bus speed modes. For other bus speed modes, we do not change the
545 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
546 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
547 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
551 * Host has different current capabilities when operating at
552 * different voltages, so find out its max current first.
554 max_current = sd_get_host_max_current(card->host);
557 * We only check host's capability here, if we set a limit that is
558 * higher than the card's maximum current, the card will be using its
559 * maximum current, e.g. if the card's maximum current is 300ma, and
560 * when we set current limit to 200ma, the card will draw 200ma, and
561 * when we set current limit to 400/600/800ma, the card will draw its
562 * maximum 300ma from the host.
564 * The above is incorrect: if we try to set a current limit that is
565 * not supported by the card, the card can rightfully error out the
566 * attempt, and remain at the default current limit. This results
567 * in a 300mA card being limited to 200mA even though the host
568 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
569 * an iMX6 host. --rmk
571 if (max_current >= 800 &&
572 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
573 current_limit = SD_SET_CURRENT_LIMIT_800;
574 else if (max_current >= 600 &&
575 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
576 current_limit = SD_SET_CURRENT_LIMIT_600;
577 else if (max_current >= 400 &&
578 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
579 current_limit = SD_SET_CURRENT_LIMIT_400;
580 else if (max_current >= 200 &&
581 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
582 current_limit = SD_SET_CURRENT_LIMIT_200;
584 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
585 err = mmc_sd_switch(card, 1, 3, current_limit, status);
589 if (((status[15] >> 4) & 0x0F) != current_limit)
590 pr_warn("%s: Problem setting current limit!\n",
591 mmc_hostname(card->host));
599 * UHS-I specific initialization procedure
601 static int mmc_sd_init_uhs_card(struct mmc_card *card)
606 if (!(card->csd.cmdclass & CCC_SWITCH))
609 status = kmalloc(64, GFP_KERNEL);
613 /* Set 4-bit bus width */
614 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
618 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
621 * Select the bus speed mode depending on host
622 * and card capability.
624 sd_update_bus_speed_mode(card);
626 /* Set the driver strength for the card */
627 err = sd_select_driver_type(card, status);
631 /* Set current limit for the card */
632 err = sd_set_current_limit(card, status);
636 /* Set bus speed mode of the card */
637 err = sd_set_bus_speed_mode(card, status);
642 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
643 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
645 if (!mmc_host_is_spi(card->host) &&
646 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
647 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
648 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
649 err = mmc_execute_tuning(card);
652 * As SD Specifications Part1 Physical Layer Specification
653 * Version 3.01 says, CMD19 tuning is available for unlocked
654 * cards in transfer state of 1.8V signaling mode. The small
655 * difference between v3.00 and 3.01 spec means that CMD19
656 * tuning is also available for DDR50 mode.
658 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
659 pr_warn("%s: ddr50 tuning failed\n",
660 mmc_hostname(card->host));
671 MMC_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]);
673 MMC_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]);
675 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
677 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
678 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
679 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
680 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
681 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
682 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
684 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
685 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
686 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
687 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
688 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
689 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
690 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
691 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
692 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
693 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
694 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
697 static ssize_t mmc_dsr_show(struct device *dev,
698 struct device_attribute *attr,
701 struct mmc_card *card = mmc_dev_to_card(dev);
702 struct mmc_host *host = card->host;
704 if (card->csd.dsr_imp && host->dsr_req)
705 return sprintf(buf, "0x%x\n", host->dsr);
707 /* return default DSR value */
708 return sprintf(buf, "0x%x\n", 0x404);
711 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
713 static struct attribute *sd_std_attrs[] = {
719 &dev_attr_erase_size.attr,
720 &dev_attr_preferred_erase_size.attr,
721 &dev_attr_fwrev.attr,
722 &dev_attr_hwrev.attr,
723 &dev_attr_manfid.attr,
725 &dev_attr_oemid.attr,
726 &dev_attr_serial.attr,
732 ATTRIBUTE_GROUPS(sd_std);
734 struct device_type sd_type = {
735 .groups = sd_std_groups,
739 * Fetch CID from card.
741 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
751 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
755 * Since we're changing the OCR value, we seem to
756 * need to tell some cards to go back to the idle
757 * state. We wait 1ms to give cards time to
763 * If SD_SEND_IF_COND indicates an SD 2.0
764 * compliant card and we should set bit 30
765 * of the ocr to indicate that we can handle
766 * block-addressed SDHC cards.
768 err = mmc_send_if_cond(host, ocr);
773 * If the host supports one of UHS-I modes, request the card
774 * to switch to 1.8V signaling level. If the card has failed
775 * repeatedly to switch however, skip this.
777 if (retries && mmc_host_uhs(host))
781 * If the host can supply more than 150mA at current voltage,
782 * XPC should be set to 1.
784 max_current = sd_get_host_max_current(host);
785 if (max_current > 150)
788 err = mmc_send_app_op_cond(host, ocr, rocr);
793 * In case CCS and S18A in the response is set, start Signal Voltage
794 * Switch procedure. SPI mode doesn't support CMD11.
796 if (!mmc_host_is_spi(host) && rocr &&
797 ((*rocr & 0x41000000) == 0x41000000)) {
798 err = mmc_set_uhs_voltage(host, pocr);
799 if (err == -EAGAIN) {
808 err = mmc_send_cid(host, cid);
812 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
817 * Fetch CSD from card.
819 err = mmc_send_csd(card, card->raw_csd);
823 err = mmc_decode_csd(card);
830 static int mmc_sd_get_ro(struct mmc_host *host)
835 * Some systems don't feature a write-protect pin and don't need one.
836 * E.g. because they only have micro-SD card slot. For those systems
837 * assume that the SD card is always read-write.
839 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
842 if (!host->ops->get_ro)
845 ro = host->ops->get_ro(host);
850 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
857 * Fetch SCR from card.
859 err = mmc_app_send_scr(card);
863 err = mmc_decode_scr(card);
868 * Fetch and process SD Status register.
870 err = mmc_read_ssr(card);
874 /* Erase init depends on CSD and SSR */
875 mmc_init_erase(card);
878 * Fetch switch information from card.
880 err = mmc_read_switch(card);
886 * For SPI, enable CRC as appropriate.
887 * This CRC enable is located AFTER the reading of the
888 * card registers because some SDHC cards are not able
889 * to provide valid CRCs for non-512-byte blocks.
891 if (mmc_host_is_spi(host)) {
892 err = mmc_spi_set_crc(host, use_spi_crc);
898 * Check if read-only switch is active.
901 int ro = mmc_sd_get_ro(host);
904 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
907 mmc_card_set_readonly(card);
914 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
916 unsigned max_dtr = (unsigned int)-1;
918 if (mmc_card_hs(card)) {
919 if (max_dtr > card->sw_caps.hs_max_dtr)
920 max_dtr = card->sw_caps.hs_max_dtr;
921 } else if (max_dtr > card->csd.max_dtr) {
922 max_dtr = card->csd.max_dtr;
928 static bool mmc_sd_card_using_v18(struct mmc_card *card)
931 * According to the SD spec., the Bus Speed Mode (function group 1) bits
932 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus
933 * they can be used to determine if the card has already switched to
936 return card->sw_caps.sd3_bus_mode &
937 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50);
941 * Handle the detection and initialisation of a card.
943 * In the case of a resume, "oldcard" will contain the card
944 * we're trying to reinitialise.
946 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
947 struct mmc_card *oldcard)
949 struct mmc_card *card;
953 bool v18_fixup_failed = false;
955 WARN_ON(!host->claimed);
957 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
962 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
963 pr_debug("%s: Perhaps the card was replaced\n",
971 * Allocate card structure.
973 card = mmc_alloc_card(host, &sd_type);
975 return PTR_ERR(card);
978 card->type = MMC_TYPE_SD;
979 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
983 * Call the optional HC's init_card function to handle quirks.
985 if (host->ops->init_card)
986 host->ops->init_card(host, card);
989 * For native busses: get card RCA and quit open drain mode.
991 if (!mmc_host_is_spi(host)) {
992 err = mmc_send_relative_addr(host, &card->rca);
998 err = mmc_sd_get_csd(host, card);
1002 mmc_decode_cid(card);
1006 * handling only for cards supporting DSR and hosts requesting
1009 if (card->csd.dsr_imp && host->dsr_req)
1013 * Select card, as all following commands rely on that.
1015 if (!mmc_host_is_spi(host)) {
1016 err = mmc_select_card(card);
1021 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1026 * If the card has not been power cycled, it may still be using 1.8V
1027 * signaling. Detect that situation and try to initialize a UHS-I (1.8V)
1030 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
1031 mmc_sd_card_using_v18(card) &&
1032 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
1034 * Re-read switch information in case it has changed since
1035 * oldcard was initialized.
1038 err = mmc_read_switch(card);
1042 if (mmc_sd_card_using_v18(card)) {
1043 if (mmc_host_set_uhs_voltage(host) ||
1044 mmc_sd_init_uhs_card(card)) {
1045 v18_fixup_failed = true;
1046 mmc_power_cycle(host, ocr);
1048 mmc_remove_card(card);
1055 /* Initialization sequence for UHS-I cards */
1056 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {
1057 err = mmc_sd_init_uhs_card(card);
1062 * Attempt to change to high-speed (if supported)
1064 err = mmc_sd_switch_hs(card);
1066 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1073 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1076 * Switch to wider bus (if supported).
1078 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1079 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1080 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1084 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1088 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1089 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1090 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1091 mmc_hostname(host));
1101 mmc_remove_card(card);
1107 * Host is being removed. Free up the current card.
1109 static void mmc_sd_remove(struct mmc_host *host)
1111 mmc_remove_card(host->card);
1116 * Card detection - card is alive.
1118 static int mmc_sd_alive(struct mmc_host *host)
1120 return mmc_send_status(host->card, NULL);
1124 * Card detection callback from host.
1126 static void mmc_sd_detect(struct mmc_host *host)
1130 mmc_get_card(host->card, NULL);
1133 * Just check if our card has been removed.
1135 err = _mmc_detect_card_removed(host);
1137 mmc_put_card(host->card, NULL);
1140 mmc_sd_remove(host);
1142 mmc_claim_host(host);
1143 mmc_detach_bus(host);
1144 mmc_power_off(host);
1145 mmc_release_host(host);
1149 static int _mmc_sd_suspend(struct mmc_host *host)
1153 mmc_claim_host(host);
1155 if (mmc_card_suspended(host->card))
1158 if (!mmc_host_is_spi(host))
1159 err = mmc_deselect_cards(host);
1162 mmc_power_off(host);
1163 mmc_card_set_suspended(host->card);
1167 mmc_release_host(host);
1172 * Callback for suspend
1174 static int mmc_sd_suspend(struct mmc_host *host)
1178 err = _mmc_sd_suspend(host);
1180 pm_runtime_disable(&host->card->dev);
1181 pm_runtime_set_suspended(&host->card->dev);
1188 * This function tries to determine if the same card is still present
1189 * and, if so, restore all state to it.
1191 static int _mmc_sd_resume(struct mmc_host *host)
1195 mmc_claim_host(host);
1197 if (!mmc_card_suspended(host->card))
1200 mmc_power_up(host, host->card->ocr);
1201 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1202 mmc_card_clr_suspended(host->card);
1205 mmc_release_host(host);
1210 * Callback for resume
1212 static int mmc_sd_resume(struct mmc_host *host)
1214 pm_runtime_enable(&host->card->dev);
1219 * Callback for runtime_suspend.
1221 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1225 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1228 err = _mmc_sd_suspend(host);
1230 pr_err("%s: error %d doing aggressive suspend\n",
1231 mmc_hostname(host), err);
1237 * Callback for runtime_resume.
1239 static int mmc_sd_runtime_resume(struct mmc_host *host)
1243 err = _mmc_sd_resume(host);
1244 if (err && err != -ENOMEDIUM)
1245 pr_err("%s: error %d doing runtime resume\n",
1246 mmc_hostname(host), err);
1251 static int mmc_sd_hw_reset(struct mmc_host *host)
1253 mmc_power_cycle(host, host->card->ocr);
1254 return mmc_sd_init_card(host, host->card->ocr, host->card);
1257 static const struct mmc_bus_ops mmc_sd_ops = {
1258 .remove = mmc_sd_remove,
1259 .detect = mmc_sd_detect,
1260 .runtime_suspend = mmc_sd_runtime_suspend,
1261 .runtime_resume = mmc_sd_runtime_resume,
1262 .suspend = mmc_sd_suspend,
1263 .resume = mmc_sd_resume,
1264 .alive = mmc_sd_alive,
1265 .shutdown = mmc_sd_suspend,
1266 .hw_reset = mmc_sd_hw_reset,
1270 * Starting point for SD card init.
1272 int mmc_attach_sd(struct mmc_host *host)
1277 WARN_ON(!host->claimed);
1279 err = mmc_send_app_op_cond(host, 0, &ocr);
1283 mmc_attach_bus(host, &mmc_sd_ops);
1284 if (host->ocr_avail_sd)
1285 host->ocr_avail = host->ocr_avail_sd;
1288 * We need to get OCR a different way for SPI.
1290 if (mmc_host_is_spi(host)) {
1293 err = mmc_spi_read_ocr(host, 0, &ocr);
1298 rocr = mmc_select_voltage(host, ocr);
1301 * Can we support the voltage(s) of the card(s)?
1309 * Detect and init the card.
1311 err = mmc_sd_init_card(host, rocr, NULL);
1315 mmc_release_host(host);
1316 err = mmc_add_card(host->card);
1320 mmc_claim_host(host);
1324 mmc_remove_card(host->card);
1326 mmc_claim_host(host);
1328 mmc_detach_bus(host);
1330 pr_err("%s: error %d whilst initialising SD card\n",
1331 mmc_hostname(host), err);