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;
142 if (UNSTUFF_BITS(resp, 13, 1))
143 mmc_card_set_readonly(card);
147 * This is a block-addressed SDHC or SDXC card. Most
148 * interesting fields are unused and have fixed
149 * values. To avoid getting tripped by buggy cards,
150 * we assume those fixed values ourselves.
152 mmc_card_set_blockaddr(card);
154 csd->taac_ns = 0; /* Unused */
155 csd->taac_clks = 0; /* Unused */
157 m = UNSTUFF_BITS(resp, 99, 4);
158 e = UNSTUFF_BITS(resp, 96, 3);
159 csd->max_dtr = tran_exp[e] * tran_mant[m];
160 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
161 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
163 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
164 if (csd->c_size >= 0xFFFF)
165 mmc_card_set_ext_capacity(card);
167 m = UNSTUFF_BITS(resp, 48, 22);
168 csd->capacity = (1 + m) << 10;
170 csd->read_blkbits = 9;
171 csd->read_partial = 0;
172 csd->write_misalign = 0;
173 csd->read_misalign = 0;
174 csd->r2w_factor = 4; /* Unused */
175 csd->write_blkbits = 9;
176 csd->write_partial = 0;
179 if (UNSTUFF_BITS(resp, 13, 1))
180 mmc_card_set_readonly(card);
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);
226 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */
227 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
228 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
229 pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
237 * Fetch and process SD Status register.
239 static int mmc_read_ssr(struct mmc_card *card)
241 unsigned int au, es, et, eo;
245 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
246 pr_warn("%s: card lacks mandatory SD Status function\n",
247 mmc_hostname(card->host));
251 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
255 if (mmc_app_sd_status(card, raw_ssr)) {
256 pr_warn("%s: problem reading SD Status register\n",
257 mmc_hostname(card->host));
262 for (i = 0; i < 16; i++)
263 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
268 * UNSTUFF_BITS only works with four u32s so we have to offset the
269 * bitfield positions accordingly.
271 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
273 if (au <= 9 || card->scr.sda_spec3) {
274 card->ssr.au = sd_au_size[au];
275 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
276 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
278 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
279 card->ssr.erase_timeout = (et * 1000) / es;
280 card->ssr.erase_offset = eo * 1000;
283 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
284 mmc_hostname(card->host));
292 * Fetches and decodes switch information
294 static int mmc_read_switch(struct mmc_card *card)
299 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
302 if (!(card->csd.cmdclass & CCC_SWITCH)) {
303 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
304 mmc_hostname(card->host));
310 status = kmalloc(64, GFP_KERNEL);
315 * Find out the card's support bits with a mode 0 operation.
316 * The argument does not matter, as the support bits do not
317 * change with the arguments.
319 err = mmc_sd_switch(card, 0, 0, 0, status);
322 * If the host or the card can't do the switch,
323 * fail more gracefully.
325 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
328 pr_warn("%s: problem reading Bus Speed modes\n",
329 mmc_hostname(card->host));
335 if (status[13] & SD_MODE_HIGH_SPEED)
336 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
338 if (card->scr.sda_spec3) {
339 card->sw_caps.sd3_bus_mode = status[13];
340 /* Driver Strengths supported by the card */
341 card->sw_caps.sd3_drv_type = status[9];
342 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
352 * Test if the card supports high-speed mode and, if so, switch to it.
354 int mmc_sd_switch_hs(struct mmc_card *card)
359 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
362 if (!(card->csd.cmdclass & CCC_SWITCH))
365 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
368 if (card->sw_caps.hs_max_dtr == 0)
371 status = kmalloc(64, GFP_KERNEL);
375 err = mmc_sd_switch(card, 1, 0, 1, status);
379 if ((status[16] & 0xF) != 1) {
380 pr_warn("%s: Problem switching card into high-speed mode!\n",
381 mmc_hostname(card->host));
393 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
395 int card_drv_type, drive_strength, drv_type;
398 card->drive_strength = 0;
400 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
402 drive_strength = mmc_select_drive_strength(card,
403 card->sw_caps.uhs_max_dtr,
404 card_drv_type, &drv_type);
406 if (drive_strength) {
407 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
410 if ((status[15] & 0xF) != drive_strength) {
411 pr_warn("%s: Problem setting drive strength!\n",
412 mmc_hostname(card->host));
415 card->drive_strength = drive_strength;
419 mmc_set_driver_type(card->host, drv_type);
424 static void sd_update_bus_speed_mode(struct mmc_card *card)
427 * If the host doesn't support any of the UHS-I modes, fallback on
430 if (!mmc_host_uhs(card->host)) {
431 card->sd_bus_speed = 0;
435 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
436 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
437 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
438 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
439 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
440 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
441 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
442 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
443 SD_MODE_UHS_SDR50)) {
444 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
445 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
446 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
447 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
448 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
449 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
450 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
451 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
452 SD_MODE_UHS_SDR12)) {
453 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
457 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
460 unsigned int timing = 0;
462 switch (card->sd_bus_speed) {
463 case UHS_SDR104_BUS_SPEED:
464 timing = MMC_TIMING_UHS_SDR104;
465 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
467 case UHS_DDR50_BUS_SPEED:
468 timing = MMC_TIMING_UHS_DDR50;
469 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
471 case UHS_SDR50_BUS_SPEED:
472 timing = MMC_TIMING_UHS_SDR50;
473 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
475 case UHS_SDR25_BUS_SPEED:
476 timing = MMC_TIMING_UHS_SDR25;
477 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
479 case UHS_SDR12_BUS_SPEED:
480 timing = MMC_TIMING_UHS_SDR12;
481 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
487 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
491 if ((status[16] & 0xF) != card->sd_bus_speed)
492 pr_warn("%s: Problem setting bus speed mode!\n",
493 mmc_hostname(card->host));
495 mmc_set_timing(card->host, timing);
496 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
502 /* Get host's max current setting at its current voltage */
503 static u32 sd_get_host_max_current(struct mmc_host *host)
505 u32 voltage, max_current;
507 voltage = 1 << host->ios.vdd;
509 case MMC_VDD_165_195:
510 max_current = host->max_current_180;
514 max_current = host->max_current_300;
518 max_current = host->max_current_330;
527 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
529 int current_limit = SD_SET_CURRENT_NO_CHANGE;
534 * Current limit switch is only defined for SDR50, SDR104, and DDR50
535 * bus speed modes. For other bus speed modes, we do not change the
538 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
539 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
540 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
544 * Host has different current capabilities when operating at
545 * different voltages, so find out its max current first.
547 max_current = sd_get_host_max_current(card->host);
550 * We only check host's capability here, if we set a limit that is
551 * higher than the card's maximum current, the card will be using its
552 * maximum current, e.g. if the card's maximum current is 300ma, and
553 * when we set current limit to 200ma, the card will draw 200ma, and
554 * when we set current limit to 400/600/800ma, the card will draw its
555 * maximum 300ma from the host.
557 * The above is incorrect: if we try to set a current limit that is
558 * not supported by the card, the card can rightfully error out the
559 * attempt, and remain at the default current limit. This results
560 * in a 300mA card being limited to 200mA even though the host
561 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
562 * an iMX6 host. --rmk
564 if (max_current >= 800 &&
565 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
566 current_limit = SD_SET_CURRENT_LIMIT_800;
567 else if (max_current >= 600 &&
568 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
569 current_limit = SD_SET_CURRENT_LIMIT_600;
570 else if (max_current >= 400 &&
571 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
572 current_limit = SD_SET_CURRENT_LIMIT_400;
573 else if (max_current >= 200 &&
574 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
575 current_limit = SD_SET_CURRENT_LIMIT_200;
577 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
578 err = mmc_sd_switch(card, 1, 3, current_limit, status);
582 if (((status[15] >> 4) & 0x0F) != current_limit)
583 pr_warn("%s: Problem setting current limit!\n",
584 mmc_hostname(card->host));
592 * UHS-I specific initialization procedure
594 static int mmc_sd_init_uhs_card(struct mmc_card *card)
599 if (!card->scr.sda_spec3)
602 if (!(card->csd.cmdclass & CCC_SWITCH))
605 status = kmalloc(64, GFP_KERNEL);
609 /* Set 4-bit bus width */
610 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
611 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
612 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
616 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
620 * Select the bus speed mode depending on host
621 * and card capability.
623 sd_update_bus_speed_mode(card);
625 /* Set the driver strength for the card */
626 err = sd_select_driver_type(card, status);
630 /* Set current limit for the card */
631 err = sd_set_current_limit(card, status);
635 /* Set bus speed mode of the card */
636 err = sd_set_bus_speed_mode(card, status);
641 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
642 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
644 if (!mmc_host_is_spi(card->host) &&
645 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
646 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
647 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
648 err = mmc_execute_tuning(card);
651 * As SD Specifications Part1 Physical Layer Specification
652 * Version 3.01 says, CMD19 tuning is available for unlocked
653 * cards in transfer state of 1.8V signaling mode. The small
654 * difference between v3.00 and 3.01 spec means that CMD19
655 * tuning is also available for DDR50 mode.
657 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
658 pr_warn("%s: ddr50 tuning failed\n",
659 mmc_hostname(card->host));
670 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
671 card->raw_cid[2], card->raw_cid[3]);
672 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
673 card->raw_csd[2], card->raw_csd[3]);
674 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
676 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
677 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
678 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
679 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
680 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
681 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
683 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
684 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
685 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
686 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
687 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
688 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
689 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
690 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
691 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
692 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
695 static ssize_t mmc_dsr_show(struct device *dev,
696 struct device_attribute *attr,
699 struct mmc_card *card = mmc_dev_to_card(dev);
700 struct mmc_host *host = card->host;
702 if (card->csd.dsr_imp && host->dsr_req)
703 return sprintf(buf, "0x%x\n", host->dsr);
705 /* return default DSR value */
706 return sprintf(buf, "0x%x\n", 0x404);
709 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
711 static struct attribute *sd_std_attrs[] = {
717 &dev_attr_erase_size.attr,
718 &dev_attr_preferred_erase_size.attr,
719 &dev_attr_fwrev.attr,
720 &dev_attr_hwrev.attr,
721 &dev_attr_manfid.attr,
723 &dev_attr_oemid.attr,
724 &dev_attr_serial.attr,
729 ATTRIBUTE_GROUPS(sd_std);
731 struct device_type sd_type = {
732 .groups = sd_std_groups,
736 * Fetch CID from card.
738 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
748 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
752 * Since we're changing the OCR value, we seem to
753 * need to tell some cards to go back to the idle
754 * state. We wait 1ms to give cards time to
760 * If SD_SEND_IF_COND indicates an SD 2.0
761 * compliant card and we should set bit 30
762 * of the ocr to indicate that we can handle
763 * block-addressed SDHC cards.
765 err = mmc_send_if_cond(host, ocr);
770 * If the host supports one of UHS-I modes, request the card
771 * to switch to 1.8V signaling level. If the card has failed
772 * repeatedly to switch however, skip this.
774 if (retries && mmc_host_uhs(host))
778 * If the host can supply more than 150mA at current voltage,
779 * XPC should be set to 1.
781 max_current = sd_get_host_max_current(host);
782 if (max_current > 150)
785 err = mmc_send_app_op_cond(host, ocr, rocr);
790 * In case the S18A bit is set in the response, let's start the signal
791 * voltage switch procedure. SPI mode doesn't support CMD11.
792 * Note that, according to the spec, the S18A bit is not valid unless
793 * the CCS bit is set as well. We deliberately deviate from the spec in
794 * regards to this, which allows UHS-I to be supported for SDSC cards.
796 if (!mmc_host_is_spi(host) && rocr && (*rocr & 0x01000000)) {
797 err = mmc_set_uhs_voltage(host, pocr);
798 if (err == -EAGAIN) {
807 err = mmc_send_cid(host, cid);
811 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
816 * Fetch CSD from card.
818 err = mmc_send_csd(card, card->raw_csd);
822 err = mmc_decode_csd(card);
829 static int mmc_sd_get_ro(struct mmc_host *host)
834 * Some systems don't feature a write-protect pin and don't need one.
835 * E.g. because they only have micro-SD card slot. For those systems
836 * assume that the SD card is always read-write.
838 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
841 if (!host->ops->get_ro)
844 ro = host->ops->get_ro(host);
849 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
856 * Fetch SCR from card.
858 err = mmc_app_send_scr(card);
862 err = mmc_decode_scr(card);
867 * Fetch and process SD Status register.
869 err = mmc_read_ssr(card);
873 /* Erase init depends on CSD and SSR */
874 mmc_init_erase(card);
877 * Fetch switch information from card.
879 err = mmc_read_switch(card);
885 * For SPI, enable CRC as appropriate.
886 * This CRC enable is located AFTER the reading of the
887 * card registers because some SDHC cards are not able
888 * to provide valid CRCs for non-512-byte blocks.
890 if (mmc_host_is_spi(host)) {
891 err = mmc_spi_set_crc(host, use_spi_crc);
897 * Check if read-only switch is active.
900 int ro = mmc_sd_get_ro(host);
903 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
906 mmc_card_set_readonly(card);
913 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
915 unsigned max_dtr = (unsigned int)-1;
917 if (mmc_card_hs(card)) {
918 if (max_dtr > card->sw_caps.hs_max_dtr)
919 max_dtr = card->sw_caps.hs_max_dtr;
920 } else if (max_dtr > card->csd.max_dtr) {
921 max_dtr = card->csd.max_dtr;
928 * Handle the detection and initialisation of a card.
930 * In the case of a resume, "oldcard" will contain the card
931 * we're trying to reinitialise.
933 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
934 struct mmc_card *oldcard)
936 struct mmc_card *card;
941 WARN_ON(!host->claimed);
943 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
948 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
954 * Allocate card structure.
956 card = mmc_alloc_card(host, &sd_type);
958 return PTR_ERR(card);
961 card->type = MMC_TYPE_SD;
962 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
966 * Call the optional HC's init_card function to handle quirks.
968 if (host->ops->init_card)
969 host->ops->init_card(host, card);
972 * For native busses: get card RCA and quit open drain mode.
974 if (!mmc_host_is_spi(host)) {
975 err = mmc_send_relative_addr(host, &card->rca);
981 err = mmc_sd_get_csd(host, card);
985 mmc_decode_cid(card);
989 * handling only for cards supporting DSR and hosts requesting
992 if (card->csd.dsr_imp && host->dsr_req)
996 * Select card, as all following commands rely on that.
998 if (!mmc_host_is_spi(host)) {
999 err = mmc_select_card(card);
1004 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1008 /* Initialization sequence for UHS-I cards */
1009 if (rocr & SD_ROCR_S18A) {
1010 err = mmc_sd_init_uhs_card(card);
1015 * Attempt to change to high-speed (if supported)
1017 err = mmc_sd_switch_hs(card);
1019 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1026 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1029 * Switch to wider bus (if supported).
1031 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1032 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1033 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1037 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1046 mmc_remove_card(card);
1052 * Host is being removed. Free up the current card.
1054 static void mmc_sd_remove(struct mmc_host *host)
1056 mmc_remove_card(host->card);
1061 * Card detection - card is alive.
1063 static int mmc_sd_alive(struct mmc_host *host)
1065 return mmc_send_status(host->card, NULL);
1069 * Card detection callback from host.
1071 static void mmc_sd_detect(struct mmc_host *host)
1075 mmc_get_card(host->card);
1078 * Just check if our card has been removed.
1080 err = _mmc_detect_card_removed(host);
1082 mmc_put_card(host->card);
1085 mmc_sd_remove(host);
1087 mmc_claim_host(host);
1088 mmc_detach_bus(host);
1089 mmc_power_off(host);
1090 mmc_release_host(host);
1094 static int _mmc_sd_suspend(struct mmc_host *host)
1098 mmc_claim_host(host);
1100 if (mmc_card_suspended(host->card))
1103 if (!mmc_host_is_spi(host))
1104 err = mmc_deselect_cards(host);
1107 mmc_power_off(host);
1108 mmc_card_set_suspended(host->card);
1112 mmc_release_host(host);
1117 * Callback for suspend
1119 static int mmc_sd_suspend(struct mmc_host *host)
1123 err = _mmc_sd_suspend(host);
1125 pm_runtime_disable(&host->card->dev);
1126 pm_runtime_set_suspended(&host->card->dev);
1133 * This function tries to determine if the same card is still present
1134 * and, if so, restore all state to it.
1136 static int _mmc_sd_resume(struct mmc_host *host)
1140 mmc_claim_host(host);
1142 if (!mmc_card_suspended(host->card))
1145 mmc_power_up(host, host->card->ocr);
1146 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1147 mmc_card_clr_suspended(host->card);
1150 mmc_release_host(host);
1155 * Callback for resume
1157 static int mmc_sd_resume(struct mmc_host *host)
1159 pm_runtime_enable(&host->card->dev);
1164 * Callback for runtime_suspend.
1166 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1170 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1173 err = _mmc_sd_suspend(host);
1175 pr_err("%s: error %d doing aggressive suspend\n",
1176 mmc_hostname(host), err);
1182 * Callback for runtime_resume.
1184 static int mmc_sd_runtime_resume(struct mmc_host *host)
1188 err = _mmc_sd_resume(host);
1189 if (err && err != -ENOMEDIUM)
1190 pr_err("%s: error %d doing runtime resume\n",
1191 mmc_hostname(host), err);
1196 static int mmc_sd_reset(struct mmc_host *host)
1198 mmc_power_cycle(host, host->card->ocr);
1199 return mmc_sd_init_card(host, host->card->ocr, host->card);
1202 static const struct mmc_bus_ops mmc_sd_ops = {
1203 .remove = mmc_sd_remove,
1204 .detect = mmc_sd_detect,
1205 .runtime_suspend = mmc_sd_runtime_suspend,
1206 .runtime_resume = mmc_sd_runtime_resume,
1207 .suspend = mmc_sd_suspend,
1208 .resume = mmc_sd_resume,
1209 .alive = mmc_sd_alive,
1210 .shutdown = mmc_sd_suspend,
1211 .reset = mmc_sd_reset,
1215 * Starting point for SD card init.
1217 int mmc_attach_sd(struct mmc_host *host)
1222 WARN_ON(!host->claimed);
1224 err = mmc_send_app_op_cond(host, 0, &ocr);
1228 mmc_attach_bus(host, &mmc_sd_ops);
1229 if (host->ocr_avail_sd)
1230 host->ocr_avail = host->ocr_avail_sd;
1233 * We need to get OCR a different way for SPI.
1235 if (mmc_host_is_spi(host)) {
1238 err = mmc_spi_read_ocr(host, 0, &ocr);
1244 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1245 * these bits as being in-valid and especially also bit7.
1249 rocr = mmc_select_voltage(host, ocr);
1252 * Can we support the voltage(s) of the card(s)?
1260 * Detect and init the card.
1262 err = mmc_sd_init_card(host, rocr, NULL);
1266 mmc_release_host(host);
1267 err = mmc_add_card(host->card);
1271 mmc_claim_host(host);
1275 mmc_remove_card(host->card);
1277 mmc_claim_host(host);
1279 mmc_detach_bus(host);
1281 pr_err("%s: error %d whilst initialising SD card\n",
1282 mmc_hostname(host), err);