1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/drivers/mmc/core/sd.c
5 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
6 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
7 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
10 #include <linux/err.h>
11 #include <linux/sizes.h>
12 #include <linux/slab.h>
13 #include <linux/stat.h>
14 #include <linux/pm_runtime.h>
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
19 #include <linux/mmc/sd.h>
29 static const unsigned int tran_exp[] = {
30 10000, 100000, 1000000, 10000000,
34 static const unsigned char tran_mant[] = {
35 0, 10, 12, 13, 15, 20, 25, 30,
36 35, 40, 45, 50, 55, 60, 70, 80,
39 static const unsigned int taac_exp[] = {
40 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
43 static const unsigned int taac_mant[] = {
44 0, 10, 12, 13, 15, 20, 25, 30,
45 35, 40, 45, 50, 55, 60, 70, 80,
48 static const unsigned int sd_au_size[] = {
49 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
50 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
51 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
52 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
55 #define UNSTUFF_BITS(resp,start,size) \
57 const int __size = size; \
58 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
59 const int __off = 3 - ((start) / 32); \
60 const int __shft = (start) & 31; \
63 __res = resp[__off] >> __shft; \
64 if (__size + __shft > 32) \
65 __res |= resp[__off-1] << ((32 - __shft) % 32); \
70 * Given the decoded CSD structure, decode the raw CID to our CID structure.
72 void mmc_decode_cid(struct mmc_card *card)
74 u32 *resp = card->raw_cid;
77 * SD doesn't currently have a version field so we will
78 * have to assume we can parse this.
80 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
81 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
82 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
83 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
84 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
85 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
86 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
87 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
88 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
89 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
90 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
91 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
93 card->cid.year += 2000; /* SD cards year offset */
97 * Given a 128-bit response, decode to our card CSD structure.
99 static int mmc_decode_csd(struct mmc_card *card)
101 struct mmc_csd *csd = &card->csd;
102 unsigned int e, m, csd_struct;
103 u32 *resp = card->raw_csd;
105 csd_struct = UNSTUFF_BITS(resp, 126, 2);
107 switch (csd_struct) {
109 m = UNSTUFF_BITS(resp, 115, 4);
110 e = UNSTUFF_BITS(resp, 112, 3);
111 csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10;
112 csd->taac_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
114 m = UNSTUFF_BITS(resp, 99, 4);
115 e = UNSTUFF_BITS(resp, 96, 3);
116 csd->max_dtr = tran_exp[e] * tran_mant[m];
117 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
119 e = UNSTUFF_BITS(resp, 47, 3);
120 m = UNSTUFF_BITS(resp, 62, 12);
121 csd->capacity = (1 + m) << (e + 2);
123 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
124 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
125 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
126 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
127 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
128 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
129 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
130 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
132 if (UNSTUFF_BITS(resp, 46, 1)) {
134 } else if (csd->write_blkbits >= 9) {
135 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
136 csd->erase_size <<= csd->write_blkbits - 9;
141 * This is a block-addressed SDHC or SDXC card. Most
142 * interesting fields are unused and have fixed
143 * values. To avoid getting tripped by buggy cards,
144 * we assume those fixed values ourselves.
146 mmc_card_set_blockaddr(card);
148 csd->taac_ns = 0; /* Unused */
149 csd->taac_clks = 0; /* Unused */
151 m = UNSTUFF_BITS(resp, 99, 4);
152 e = UNSTUFF_BITS(resp, 96, 3);
153 csd->max_dtr = tran_exp[e] * tran_mant[m];
154 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
155 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
157 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
158 if (csd->c_size >= 0xFFFF)
159 mmc_card_set_ext_capacity(card);
161 m = UNSTUFF_BITS(resp, 48, 22);
162 csd->capacity = (1 + m) << 10;
164 csd->read_blkbits = 9;
165 csd->read_partial = 0;
166 csd->write_misalign = 0;
167 csd->read_misalign = 0;
168 csd->r2w_factor = 4; /* Unused */
169 csd->write_blkbits = 9;
170 csd->write_partial = 0;
174 pr_err("%s: unrecognised CSD structure version %d\n",
175 mmc_hostname(card->host), csd_struct);
179 card->erase_size = csd->erase_size;
185 * Given a 64-bit response, decode to our card SCR structure.
187 static int mmc_decode_scr(struct mmc_card *card)
189 struct sd_scr *scr = &card->scr;
190 unsigned int scr_struct;
193 resp[3] = card->raw_scr[1];
194 resp[2] = card->raw_scr[0];
196 scr_struct = UNSTUFF_BITS(resp, 60, 4);
197 if (scr_struct != 0) {
198 pr_err("%s: unrecognised SCR structure version %d\n",
199 mmc_hostname(card->host), scr_struct);
203 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
204 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
205 if (scr->sda_vsn == SCR_SPEC_VER_2)
206 /* Check if Physical Layer Spec v3.0 is supported */
207 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
209 if (scr->sda_spec3) {
210 scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1);
211 scr->sda_specx = UNSTUFF_BITS(resp, 38, 4);
214 if (UNSTUFF_BITS(resp, 55, 1))
215 card->erased_byte = 0xFF;
217 card->erased_byte = 0x0;
220 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
222 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */
223 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
224 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
225 pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
233 * Fetch and process SD Status register.
235 static int mmc_read_ssr(struct mmc_card *card)
237 unsigned int au, es, et, eo;
243 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
244 pr_warn("%s: card lacks mandatory SD Status function\n",
245 mmc_hostname(card->host));
249 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
253 if (mmc_app_sd_status(card, raw_ssr)) {
254 pr_warn("%s: problem reading SD Status register\n",
255 mmc_hostname(card->host));
260 for (i = 0; i < 16; i++)
261 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
266 * UNSTUFF_BITS only works with four u32s so we have to offset the
267 * bitfield positions accordingly.
269 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
271 if (au <= 9 || card->scr.sda_spec3) {
272 card->ssr.au = sd_au_size[au];
273 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
274 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
276 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
277 card->ssr.erase_timeout = (et * 1000) / es;
278 card->ssr.erase_offset = eo * 1000;
281 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
282 mmc_hostname(card->host));
287 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set
289 resp[3] = card->raw_ssr[6];
290 discard_support = UNSTUFF_BITS(resp, 313 - 288, 1);
291 card->erase_arg = (card->scr.sda_specx && discard_support) ?
292 SD_DISCARD_ARG : SD_ERASE_ARG;
298 * Fetches and decodes switch information
300 static int mmc_read_switch(struct mmc_card *card)
305 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
308 if (!(card->csd.cmdclass & CCC_SWITCH)) {
309 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
310 mmc_hostname(card->host));
314 status = kmalloc(64, GFP_KERNEL);
319 * Find out the card's support bits with a mode 0 operation.
320 * The argument does not matter, as the support bits do not
321 * change with the arguments.
323 err = mmc_sd_switch(card, 0, 0, 0, status);
326 * If the host or the card can't do the switch,
327 * fail more gracefully.
329 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
332 pr_warn("%s: problem reading Bus Speed modes\n",
333 mmc_hostname(card->host));
339 if (status[13] & SD_MODE_HIGH_SPEED)
340 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
342 if (card->scr.sda_spec3) {
343 card->sw_caps.sd3_bus_mode = status[13];
344 /* Driver Strengths supported by the card */
345 card->sw_caps.sd3_drv_type = status[9];
346 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
356 * Test if the card supports high-speed mode and, if so, switch to it.
358 int mmc_sd_switch_hs(struct mmc_card *card)
363 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
366 if (!(card->csd.cmdclass & CCC_SWITCH))
369 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
372 if (card->sw_caps.hs_max_dtr == 0)
375 status = kmalloc(64, GFP_KERNEL);
379 err = mmc_sd_switch(card, 1, 0, HIGH_SPEED_BUS_SPEED, status);
383 if ((status[16] & 0xF) != HIGH_SPEED_BUS_SPEED) {
384 pr_warn("%s: Problem switching card into high-speed mode!\n",
385 mmc_hostname(card->host));
397 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
399 int card_drv_type, drive_strength, drv_type;
402 card->drive_strength = 0;
404 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
406 drive_strength = mmc_select_drive_strength(card,
407 card->sw_caps.uhs_max_dtr,
408 card_drv_type, &drv_type);
410 if (drive_strength) {
411 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
414 if ((status[15] & 0xF) != drive_strength) {
415 pr_warn("%s: Problem setting drive strength!\n",
416 mmc_hostname(card->host));
419 card->drive_strength = drive_strength;
423 mmc_set_driver_type(card->host, drv_type);
428 static void sd_update_bus_speed_mode(struct mmc_card *card)
431 * If the host doesn't support any of the UHS-I modes, fallback on
434 if (!mmc_host_uhs(card->host)) {
435 card->sd_bus_speed = 0;
439 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
440 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
441 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
442 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
443 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
444 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
445 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
446 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
447 SD_MODE_UHS_SDR50)) {
448 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
449 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
450 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
451 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
452 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
453 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
454 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
455 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
456 SD_MODE_UHS_SDR12)) {
457 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
461 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
464 unsigned int timing = 0;
466 switch (card->sd_bus_speed) {
467 case UHS_SDR104_BUS_SPEED:
468 timing = MMC_TIMING_UHS_SDR104;
469 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
471 case UHS_DDR50_BUS_SPEED:
472 timing = MMC_TIMING_UHS_DDR50;
473 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
475 case UHS_SDR50_BUS_SPEED:
476 timing = MMC_TIMING_UHS_SDR50;
477 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
479 case UHS_SDR25_BUS_SPEED:
480 timing = MMC_TIMING_UHS_SDR25;
481 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
483 case UHS_SDR12_BUS_SPEED:
484 timing = MMC_TIMING_UHS_SDR12;
485 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
491 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
495 if ((status[16] & 0xF) != card->sd_bus_speed)
496 pr_warn("%s: Problem setting bus speed mode!\n",
497 mmc_hostname(card->host));
499 mmc_set_timing(card->host, timing);
500 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
506 /* Get host's max current setting at its current voltage */
507 static u32 sd_get_host_max_current(struct mmc_host *host)
509 u32 voltage, max_current;
511 voltage = 1 << host->ios.vdd;
513 case MMC_VDD_165_195:
514 max_current = host->max_current_180;
518 max_current = host->max_current_300;
522 max_current = host->max_current_330;
531 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
533 int current_limit = SD_SET_CURRENT_NO_CHANGE;
538 * Current limit switch is only defined for SDR50, SDR104, and DDR50
539 * bus speed modes. For other bus speed modes, we do not change the
542 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
543 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
544 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
548 * Host has different current capabilities when operating at
549 * different voltages, so find out its max current first.
551 max_current = sd_get_host_max_current(card->host);
554 * We only check host's capability here, if we set a limit that is
555 * higher than the card's maximum current, the card will be using its
556 * maximum current, e.g. if the card's maximum current is 300ma, and
557 * when we set current limit to 200ma, the card will draw 200ma, and
558 * when we set current limit to 400/600/800ma, the card will draw its
559 * maximum 300ma from the host.
561 * The above is incorrect: if we try to set a current limit that is
562 * not supported by the card, the card can rightfully error out the
563 * attempt, and remain at the default current limit. This results
564 * in a 300mA card being limited to 200mA even though the host
565 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
566 * an iMX6 host. --rmk
568 if (max_current >= 800 &&
569 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
570 current_limit = SD_SET_CURRENT_LIMIT_800;
571 else if (max_current >= 600 &&
572 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
573 current_limit = SD_SET_CURRENT_LIMIT_600;
574 else if (max_current >= 400 &&
575 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
576 current_limit = SD_SET_CURRENT_LIMIT_400;
577 else if (max_current >= 200 &&
578 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
579 current_limit = SD_SET_CURRENT_LIMIT_200;
581 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
582 err = mmc_sd_switch(card, 1, 3, current_limit, status);
586 if (((status[15] >> 4) & 0x0F) != current_limit)
587 pr_warn("%s: Problem setting current limit!\n",
588 mmc_hostname(card->host));
596 * UHS-I specific initialization procedure
598 static int mmc_sd_init_uhs_card(struct mmc_card *card)
603 if (!(card->csd.cmdclass & CCC_SWITCH))
606 status = kmalloc(64, GFP_KERNEL);
610 /* Set 4-bit bus width */
611 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
615 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
618 * Select the bus speed mode depending on host
619 * and card capability.
621 sd_update_bus_speed_mode(card);
623 /* Set the driver strength for the card */
624 err = sd_select_driver_type(card, status);
628 /* Set current limit for the card */
629 err = sd_set_current_limit(card, status);
633 /* Set bus speed mode of the card */
634 err = sd_set_bus_speed_mode(card, status);
639 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
640 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
642 if (!mmc_host_is_spi(card->host) &&
643 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
644 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
645 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
646 err = mmc_execute_tuning(card);
649 * As SD Specifications Part1 Physical Layer Specification
650 * Version 3.01 says, CMD19 tuning is available for unlocked
651 * cards in transfer state of 1.8V signaling mode. The small
652 * difference between v3.00 and 3.01 spec means that CMD19
653 * tuning is also available for DDR50 mode.
655 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
656 pr_warn("%s: ddr50 tuning failed\n",
657 mmc_hostname(card->host));
668 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
669 card->raw_cid[2], card->raw_cid[3]);
670 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
671 card->raw_csd[2], card->raw_csd[3]);
672 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
674 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
675 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
676 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
677 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
678 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
679 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
681 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
682 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
683 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
684 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
685 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
686 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
687 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
688 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
689 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
690 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
691 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
694 static ssize_t mmc_dsr_show(struct device *dev,
695 struct device_attribute *attr,
698 struct mmc_card *card = mmc_dev_to_card(dev);
699 struct mmc_host *host = card->host;
701 if (card->csd.dsr_imp && host->dsr_req)
702 return sprintf(buf, "0x%x\n", host->dsr);
704 /* return default DSR value */
705 return sprintf(buf, "0x%x\n", 0x404);
708 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
710 MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
711 MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
713 static struct attribute *sd_std_attrs[] = {
714 &dev_attr_vendor.attr,
715 &dev_attr_device.attr,
721 &dev_attr_erase_size.attr,
722 &dev_attr_preferred_erase_size.attr,
723 &dev_attr_fwrev.attr,
724 &dev_attr_hwrev.attr,
725 &dev_attr_manfid.attr,
727 &dev_attr_oemid.attr,
728 &dev_attr_serial.attr,
735 static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr,
738 struct device *dev = container_of(kobj, struct device, kobj);
739 struct mmc_card *card = mmc_dev_to_card(dev);
741 /* CIS vendor and device ids are available only for Combo cards */
742 if ((attr == &dev_attr_vendor.attr || attr == &dev_attr_device.attr) &&
743 card->type != MMC_TYPE_SD_COMBO)
749 static const struct attribute_group sd_std_group = {
750 .attrs = sd_std_attrs,
751 .is_visible = sd_std_is_visible,
753 __ATTRIBUTE_GROUPS(sd_std);
755 struct device_type sd_type = {
756 .groups = sd_std_groups,
760 * Fetch CID from card.
762 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
772 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
776 * Since we're changing the OCR value, we seem to
777 * need to tell some cards to go back to the idle
778 * state. We wait 1ms to give cards time to
784 * If SD_SEND_IF_COND indicates an SD 2.0
785 * compliant card and we should set bit 30
786 * of the ocr to indicate that we can handle
787 * block-addressed SDHC cards.
789 err = mmc_send_if_cond(host, ocr);
794 * If the host supports one of UHS-I modes, request the card
795 * to switch to 1.8V signaling level. If the card has failed
796 * repeatedly to switch however, skip this.
798 if (retries && mmc_host_uhs(host))
802 * If the host can supply more than 150mA at current voltage,
803 * XPC should be set to 1.
805 max_current = sd_get_host_max_current(host);
806 if (max_current > 150)
809 err = mmc_send_app_op_cond(host, ocr, rocr);
814 * In case CCS and S18A in the response is set, start Signal Voltage
815 * Switch procedure. SPI mode doesn't support CMD11.
817 if (!mmc_host_is_spi(host) && rocr &&
818 ((*rocr & 0x41000000) == 0x41000000)) {
819 err = mmc_set_uhs_voltage(host, pocr);
820 if (err == -EAGAIN) {
829 err = mmc_send_cid(host, cid);
833 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
838 * Fetch CSD from card.
840 err = mmc_send_csd(card, card->raw_csd);
844 err = mmc_decode_csd(card);
851 static int mmc_sd_get_ro(struct mmc_host *host)
856 * Some systems don't feature a write-protect pin and don't need one.
857 * E.g. because they only have micro-SD card slot. For those systems
858 * assume that the SD card is always read-write.
860 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
863 if (!host->ops->get_ro)
866 ro = host->ops->get_ro(host);
871 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
878 * Fetch SCR from card.
880 err = mmc_app_send_scr(card);
884 err = mmc_decode_scr(card);
889 * Fetch and process SD Status register.
891 err = mmc_read_ssr(card);
895 /* Erase init depends on CSD and SSR */
896 mmc_init_erase(card);
899 * Fetch switch information from card.
901 err = mmc_read_switch(card);
907 * For SPI, enable CRC as appropriate.
908 * This CRC enable is located AFTER the reading of the
909 * card registers because some SDHC cards are not able
910 * to provide valid CRCs for non-512-byte blocks.
912 if (mmc_host_is_spi(host)) {
913 err = mmc_spi_set_crc(host, use_spi_crc);
919 * Check if read-only switch is active.
922 int ro = mmc_sd_get_ro(host);
925 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
928 mmc_card_set_readonly(card);
935 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
937 unsigned max_dtr = (unsigned int)-1;
939 if (mmc_card_hs(card)) {
940 if (max_dtr > card->sw_caps.hs_max_dtr)
941 max_dtr = card->sw_caps.hs_max_dtr;
942 } else if (max_dtr > card->csd.max_dtr) {
943 max_dtr = card->csd.max_dtr;
949 static bool mmc_sd_card_using_v18(struct mmc_card *card)
952 * According to the SD spec., the Bus Speed Mode (function group 1) bits
953 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus
954 * they can be used to determine if the card has already switched to
957 return card->sw_caps.sd3_bus_mode &
958 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50);
962 * Handle the detection and initialisation of a card.
964 * In the case of a resume, "oldcard" will contain the card
965 * we're trying to reinitialise.
967 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
968 struct mmc_card *oldcard)
970 struct mmc_card *card;
974 bool v18_fixup_failed = false;
976 WARN_ON(!host->claimed);
978 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
983 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
984 pr_debug("%s: Perhaps the card was replaced\n",
992 * Allocate card structure.
994 card = mmc_alloc_card(host, &sd_type);
996 return PTR_ERR(card);
999 card->type = MMC_TYPE_SD;
1000 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1004 * Call the optional HC's init_card function to handle quirks.
1006 if (host->ops->init_card)
1007 host->ops->init_card(host, card);
1010 * For native busses: get card RCA and quit open drain mode.
1012 if (!mmc_host_is_spi(host)) {
1013 err = mmc_send_relative_addr(host, &card->rca);
1019 err = mmc_sd_get_csd(host, card);
1023 mmc_decode_cid(card);
1027 * handling only for cards supporting DSR and hosts requesting
1030 if (card->csd.dsr_imp && host->dsr_req)
1034 * Select card, as all following commands rely on that.
1036 if (!mmc_host_is_spi(host)) {
1037 err = mmc_select_card(card);
1042 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1047 * If the card has not been power cycled, it may still be using 1.8V
1048 * signaling. Detect that situation and try to initialize a UHS-I (1.8V)
1051 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
1052 mmc_sd_card_using_v18(card) &&
1053 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
1055 * Re-read switch information in case it has changed since
1056 * oldcard was initialized.
1059 err = mmc_read_switch(card);
1063 if (mmc_sd_card_using_v18(card)) {
1064 if (mmc_host_set_uhs_voltage(host) ||
1065 mmc_sd_init_uhs_card(card)) {
1066 v18_fixup_failed = true;
1067 mmc_power_cycle(host, ocr);
1069 mmc_remove_card(card);
1076 /* Initialization sequence for UHS-I cards */
1077 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {
1078 err = mmc_sd_init_uhs_card(card);
1083 * Attempt to change to high-speed (if supported)
1085 err = mmc_sd_switch_hs(card);
1087 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1094 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1097 * Switch to wider bus (if supported).
1099 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1100 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1101 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1105 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1109 if (host->cqe_ops && !host->cqe_enabled) {
1110 err = host->cqe_ops->cqe_enable(host, card);
1112 host->cqe_enabled = true;
1113 host->hsq_enabled = true;
1114 pr_info("%s: Host Software Queue enabled\n",
1115 mmc_hostname(host));
1119 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1120 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1121 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1122 mmc_hostname(host));
1132 mmc_remove_card(card);
1138 * Host is being removed. Free up the current card.
1140 static void mmc_sd_remove(struct mmc_host *host)
1142 mmc_remove_card(host->card);
1147 * Card detection - card is alive.
1149 static int mmc_sd_alive(struct mmc_host *host)
1151 return mmc_send_status(host->card, NULL);
1155 * Card detection callback from host.
1157 static void mmc_sd_detect(struct mmc_host *host)
1161 mmc_get_card(host->card, NULL);
1164 * Just check if our card has been removed.
1166 err = _mmc_detect_card_removed(host);
1168 mmc_put_card(host->card, NULL);
1171 mmc_sd_remove(host);
1173 mmc_claim_host(host);
1174 mmc_detach_bus(host);
1175 mmc_power_off(host);
1176 mmc_release_host(host);
1180 static int _mmc_sd_suspend(struct mmc_host *host)
1184 mmc_claim_host(host);
1186 if (mmc_card_suspended(host->card))
1189 if (!mmc_host_is_spi(host))
1190 err = mmc_deselect_cards(host);
1193 mmc_power_off(host);
1194 mmc_card_set_suspended(host->card);
1198 mmc_release_host(host);
1203 * Callback for suspend
1205 static int mmc_sd_suspend(struct mmc_host *host)
1209 err = _mmc_sd_suspend(host);
1211 pm_runtime_disable(&host->card->dev);
1212 pm_runtime_set_suspended(&host->card->dev);
1219 * This function tries to determine if the same card is still present
1220 * and, if so, restore all state to it.
1222 static int _mmc_sd_resume(struct mmc_host *host)
1226 mmc_claim_host(host);
1228 if (!mmc_card_suspended(host->card))
1231 mmc_power_up(host, host->card->ocr);
1232 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1233 mmc_card_clr_suspended(host->card);
1236 mmc_release_host(host);
1241 * Callback for resume
1243 static int mmc_sd_resume(struct mmc_host *host)
1245 pm_runtime_enable(&host->card->dev);
1250 * Callback for runtime_suspend.
1252 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1256 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1259 err = _mmc_sd_suspend(host);
1261 pr_err("%s: error %d doing aggressive suspend\n",
1262 mmc_hostname(host), err);
1268 * Callback for runtime_resume.
1270 static int mmc_sd_runtime_resume(struct mmc_host *host)
1274 err = _mmc_sd_resume(host);
1275 if (err && err != -ENOMEDIUM)
1276 pr_err("%s: error %d doing runtime resume\n",
1277 mmc_hostname(host), err);
1282 static int mmc_sd_hw_reset(struct mmc_host *host)
1284 mmc_power_cycle(host, host->card->ocr);
1285 return mmc_sd_init_card(host, host->card->ocr, host->card);
1288 static const struct mmc_bus_ops mmc_sd_ops = {
1289 .remove = mmc_sd_remove,
1290 .detect = mmc_sd_detect,
1291 .runtime_suspend = mmc_sd_runtime_suspend,
1292 .runtime_resume = mmc_sd_runtime_resume,
1293 .suspend = mmc_sd_suspend,
1294 .resume = mmc_sd_resume,
1295 .alive = mmc_sd_alive,
1296 .shutdown = mmc_sd_suspend,
1297 .hw_reset = mmc_sd_hw_reset,
1301 * Starting point for SD card init.
1303 int mmc_attach_sd(struct mmc_host *host)
1308 WARN_ON(!host->claimed);
1310 err = mmc_send_app_op_cond(host, 0, &ocr);
1314 mmc_attach_bus(host, &mmc_sd_ops);
1315 if (host->ocr_avail_sd)
1316 host->ocr_avail = host->ocr_avail_sd;
1319 * We need to get OCR a different way for SPI.
1321 if (mmc_host_is_spi(host)) {
1324 err = mmc_spi_read_ocr(host, 0, &ocr);
1330 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1331 * these bits as being in-valid and especially also bit7.
1335 rocr = mmc_select_voltage(host, ocr);
1338 * Can we support the voltage(s) of the card(s)?
1346 * Detect and init the card.
1348 err = mmc_sd_init_card(host, rocr, NULL);
1352 mmc_release_host(host);
1353 err = mmc_add_card(host->card);
1357 mmc_claim_host(host);
1361 mmc_remove_card(host->card);
1363 mmc_claim_host(host);
1365 mmc_detach_bus(host);
1367 pr_err("%s: error %d whilst initialising SD card\n",
1368 mmc_hostname(host), err);