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));
308 status = kmalloc(64, GFP_KERNEL);
313 * Find out the card's support bits with a mode 0 operation.
314 * The argument does not matter, as the support bits do not
315 * change with the arguments.
317 err = mmc_sd_switch(card, 0, 0, 0, status);
320 * If the host or the card can't do the switch,
321 * fail more gracefully.
323 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
326 pr_warn("%s: problem reading Bus Speed modes\n",
327 mmc_hostname(card->host));
333 if (status[13] & SD_MODE_HIGH_SPEED)
334 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
336 if (card->scr.sda_spec3) {
337 card->sw_caps.sd3_bus_mode = status[13];
338 /* Driver Strengths supported by the card */
339 card->sw_caps.sd3_drv_type = status[9];
340 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
350 * Test if the card supports high-speed mode and, if so, switch to it.
352 int mmc_sd_switch_hs(struct mmc_card *card)
357 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
360 if (!(card->csd.cmdclass & CCC_SWITCH))
363 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
366 if (card->sw_caps.hs_max_dtr == 0)
369 status = kmalloc(64, GFP_KERNEL);
373 err = mmc_sd_switch(card, 1, 0, 1, status);
377 if ((status[16] & 0xF) != 1) {
378 pr_warn("%s: Problem switching card into high-speed mode!\n",
379 mmc_hostname(card->host));
391 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
393 int card_drv_type, drive_strength, drv_type;
396 card->drive_strength = 0;
398 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
400 drive_strength = mmc_select_drive_strength(card,
401 card->sw_caps.uhs_max_dtr,
402 card_drv_type, &drv_type);
404 if (drive_strength) {
405 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
408 if ((status[15] & 0xF) != drive_strength) {
409 pr_warn("%s: Problem setting drive strength!\n",
410 mmc_hostname(card->host));
413 card->drive_strength = drive_strength;
417 mmc_set_driver_type(card->host, drv_type);
422 static void sd_update_bus_speed_mode(struct mmc_card *card)
425 * If the host doesn't support any of the UHS-I modes, fallback on
428 if (!mmc_host_uhs(card->host)) {
429 card->sd_bus_speed = 0;
433 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
434 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
435 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
436 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
437 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
438 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
439 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
440 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
441 SD_MODE_UHS_SDR50)) {
442 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
443 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
444 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
445 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
446 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
447 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
448 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
449 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
450 SD_MODE_UHS_SDR12)) {
451 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
455 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
458 unsigned int timing = 0;
460 switch (card->sd_bus_speed) {
461 case UHS_SDR104_BUS_SPEED:
462 timing = MMC_TIMING_UHS_SDR104;
463 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
465 case UHS_DDR50_BUS_SPEED:
466 timing = MMC_TIMING_UHS_DDR50;
467 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
469 case UHS_SDR50_BUS_SPEED:
470 timing = MMC_TIMING_UHS_SDR50;
471 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
473 case UHS_SDR25_BUS_SPEED:
474 timing = MMC_TIMING_UHS_SDR25;
475 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
477 case UHS_SDR12_BUS_SPEED:
478 timing = MMC_TIMING_UHS_SDR12;
479 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
485 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
489 if ((status[16] & 0xF) != card->sd_bus_speed)
490 pr_warn("%s: Problem setting bus speed mode!\n",
491 mmc_hostname(card->host));
493 mmc_set_timing(card->host, timing);
494 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
500 /* Get host's max current setting at its current voltage */
501 static u32 sd_get_host_max_current(struct mmc_host *host)
503 u32 voltage, max_current;
505 voltage = 1 << host->ios.vdd;
507 case MMC_VDD_165_195:
508 max_current = host->max_current_180;
512 max_current = host->max_current_300;
516 max_current = host->max_current_330;
525 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
527 int current_limit = SD_SET_CURRENT_NO_CHANGE;
532 * Current limit switch is only defined for SDR50, SDR104, and DDR50
533 * bus speed modes. For other bus speed modes, we do not change the
536 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
537 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
538 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
542 * Host has different current capabilities when operating at
543 * different voltages, so find out its max current first.
545 max_current = sd_get_host_max_current(card->host);
548 * We only check host's capability here, if we set a limit that is
549 * higher than the card's maximum current, the card will be using its
550 * maximum current, e.g. if the card's maximum current is 300ma, and
551 * when we set current limit to 200ma, the card will draw 200ma, and
552 * when we set current limit to 400/600/800ma, the card will draw its
553 * maximum 300ma from the host.
555 * The above is incorrect: if we try to set a current limit that is
556 * not supported by the card, the card can rightfully error out the
557 * attempt, and remain at the default current limit. This results
558 * in a 300mA card being limited to 200mA even though the host
559 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
560 * an iMX6 host. --rmk
562 if (max_current >= 800 &&
563 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
564 current_limit = SD_SET_CURRENT_LIMIT_800;
565 else if (max_current >= 600 &&
566 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
567 current_limit = SD_SET_CURRENT_LIMIT_600;
568 else if (max_current >= 400 &&
569 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
570 current_limit = SD_SET_CURRENT_LIMIT_400;
571 else if (max_current >= 200 &&
572 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
573 current_limit = SD_SET_CURRENT_LIMIT_200;
575 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
576 err = mmc_sd_switch(card, 1, 3, current_limit, status);
580 if (((status[15] >> 4) & 0x0F) != current_limit)
581 pr_warn("%s: Problem setting current limit!\n",
582 mmc_hostname(card->host));
590 * UHS-I specific initialization procedure
592 static int mmc_sd_init_uhs_card(struct mmc_card *card)
597 if (!(card->csd.cmdclass & CCC_SWITCH))
600 status = kmalloc(64, GFP_KERNEL);
604 /* Set 4-bit bus width */
605 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
609 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
612 * Select the bus speed mode depending on host
613 * and card capability.
615 sd_update_bus_speed_mode(card);
617 /* Set the driver strength for the card */
618 err = sd_select_driver_type(card, status);
622 /* Set current limit for the card */
623 err = sd_set_current_limit(card, status);
627 /* Set bus speed mode of the card */
628 err = sd_set_bus_speed_mode(card, status);
633 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
634 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
636 if (!mmc_host_is_spi(card->host) &&
637 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
638 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
639 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
640 err = mmc_execute_tuning(card);
643 * As SD Specifications Part1 Physical Layer Specification
644 * Version 3.01 says, CMD19 tuning is available for unlocked
645 * cards in transfer state of 1.8V signaling mode. The small
646 * difference between v3.00 and 3.01 spec means that CMD19
647 * tuning is also available for DDR50 mode.
649 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
650 pr_warn("%s: ddr50 tuning failed\n",
651 mmc_hostname(card->host));
662 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
663 card->raw_cid[2], card->raw_cid[3]);
664 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
665 card->raw_csd[2], card->raw_csd[3]);
666 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
668 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
669 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
670 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
671 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
672 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
673 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
675 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
676 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
677 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
678 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
679 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
680 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
681 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
682 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
683 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
684 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
685 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
688 static ssize_t mmc_dsr_show(struct device *dev,
689 struct device_attribute *attr,
692 struct mmc_card *card = mmc_dev_to_card(dev);
693 struct mmc_host *host = card->host;
695 if (card->csd.dsr_imp && host->dsr_req)
696 return sprintf(buf, "0x%x\n", host->dsr);
698 /* return default DSR value */
699 return sprintf(buf, "0x%x\n", 0x404);
702 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
704 static struct attribute *sd_std_attrs[] = {
710 &dev_attr_erase_size.attr,
711 &dev_attr_preferred_erase_size.attr,
712 &dev_attr_fwrev.attr,
713 &dev_attr_hwrev.attr,
714 &dev_attr_manfid.attr,
716 &dev_attr_oemid.attr,
717 &dev_attr_serial.attr,
723 ATTRIBUTE_GROUPS(sd_std);
725 struct device_type sd_type = {
726 .groups = sd_std_groups,
730 * Fetch CID from card.
732 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
742 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
746 * Since we're changing the OCR value, we seem to
747 * need to tell some cards to go back to the idle
748 * state. We wait 1ms to give cards time to
754 * If SD_SEND_IF_COND indicates an SD 2.0
755 * compliant card and we should set bit 30
756 * of the ocr to indicate that we can handle
757 * block-addressed SDHC cards.
759 err = mmc_send_if_cond(host, ocr);
764 * If the host supports one of UHS-I modes, request the card
765 * to switch to 1.8V signaling level. If the card has failed
766 * repeatedly to switch however, skip this.
768 if (retries && mmc_host_uhs(host))
772 * If the host can supply more than 150mA at current voltage,
773 * XPC should be set to 1.
775 max_current = sd_get_host_max_current(host);
776 if (max_current > 150)
779 err = mmc_send_app_op_cond(host, ocr, rocr);
784 * In case the S18A bit is set in the response, let's start the signal
785 * voltage switch procedure. SPI mode doesn't support CMD11.
786 * Note that, according to the spec, the S18A bit is not valid unless
787 * the CCS bit is set as well. We deliberately deviate from the spec in
788 * regards to this, which allows UHS-I to be supported for SDSC cards.
790 if (!mmc_host_is_spi(host) && rocr && (*rocr & 0x01000000)) {
791 err = mmc_set_uhs_voltage(host, pocr);
792 if (err == -EAGAIN) {
801 err = mmc_send_cid(host, cid);
805 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
810 * Fetch CSD from card.
812 err = mmc_send_csd(card, card->raw_csd);
816 err = mmc_decode_csd(card);
823 static int mmc_sd_get_ro(struct mmc_host *host)
828 * Some systems don't feature a write-protect pin and don't need one.
829 * E.g. because they only have micro-SD card slot. For those systems
830 * assume that the SD card is always read-write.
832 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
835 if (!host->ops->get_ro)
838 ro = host->ops->get_ro(host);
843 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
850 * Fetch SCR from card.
852 err = mmc_app_send_scr(card);
856 err = mmc_decode_scr(card);
861 * Fetch and process SD Status register.
863 err = mmc_read_ssr(card);
867 /* Erase init depends on CSD and SSR */
868 mmc_init_erase(card);
871 * Fetch switch information from card.
873 err = mmc_read_switch(card);
879 * For SPI, enable CRC as appropriate.
880 * This CRC enable is located AFTER the reading of the
881 * card registers because some SDHC cards are not able
882 * to provide valid CRCs for non-512-byte blocks.
884 if (mmc_host_is_spi(host)) {
885 err = mmc_spi_set_crc(host, use_spi_crc);
891 * Check if read-only switch is active.
894 int ro = mmc_sd_get_ro(host);
897 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
900 mmc_card_set_readonly(card);
907 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
909 unsigned max_dtr = (unsigned int)-1;
911 if (mmc_card_hs(card)) {
912 if (max_dtr > card->sw_caps.hs_max_dtr)
913 max_dtr = card->sw_caps.hs_max_dtr;
914 } else if (max_dtr > card->csd.max_dtr) {
915 max_dtr = card->csd.max_dtr;
921 static bool mmc_sd_card_using_v18(struct mmc_card *card)
924 * According to the SD spec., the Bus Speed Mode (function group 1) bits
925 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus
926 * they can be used to determine if the card has already switched to
929 return card->sw_caps.sd3_bus_mode &
930 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50);
934 * Handle the detection and initialisation of a card.
936 * In the case of a resume, "oldcard" will contain the card
937 * we're trying to reinitialise.
939 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
940 struct mmc_card *oldcard)
942 struct mmc_card *card;
946 bool v18_fixup_failed = false;
948 WARN_ON(!host->claimed);
950 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
955 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
961 * Allocate card structure.
963 card = mmc_alloc_card(host, &sd_type);
965 return PTR_ERR(card);
968 card->type = MMC_TYPE_SD;
969 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
973 * Call the optional HC's init_card function to handle quirks.
975 if (host->ops->init_card)
976 host->ops->init_card(host, card);
979 * For native busses: get card RCA and quit open drain mode.
981 if (!mmc_host_is_spi(host)) {
982 err = mmc_send_relative_addr(host, &card->rca);
988 err = mmc_sd_get_csd(host, card);
992 mmc_decode_cid(card);
996 * handling only for cards supporting DSR and hosts requesting
999 if (card->csd.dsr_imp && host->dsr_req)
1003 * Select card, as all following commands rely on that.
1005 if (!mmc_host_is_spi(host)) {
1006 err = mmc_select_card(card);
1011 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1016 * If the card has not been power cycled, it may still be using 1.8V
1017 * signaling. Detect that situation and try to initialize a UHS-I (1.8V)
1020 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
1021 mmc_sd_card_using_v18(card) &&
1022 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
1024 * Re-read switch information in case it has changed since
1025 * oldcard was initialized.
1028 err = mmc_read_switch(card);
1032 if (mmc_sd_card_using_v18(card)) {
1033 if (mmc_host_set_uhs_voltage(host) ||
1034 mmc_sd_init_uhs_card(card)) {
1035 v18_fixup_failed = true;
1036 mmc_power_cycle(host, ocr);
1038 mmc_remove_card(card);
1045 /* Initialization sequence for UHS-I cards */
1046 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {
1047 err = mmc_sd_init_uhs_card(card);
1052 * Attempt to change to high-speed (if supported)
1054 err = mmc_sd_switch_hs(card);
1056 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1063 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1066 * Switch to wider bus (if supported).
1068 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1069 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1070 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1074 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1078 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1079 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1080 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1081 mmc_hostname(host));
1091 mmc_remove_card(card);
1097 * Host is being removed. Free up the current card.
1099 static void mmc_sd_remove(struct mmc_host *host)
1101 mmc_remove_card(host->card);
1106 * Card detection - card is alive.
1108 static int mmc_sd_alive(struct mmc_host *host)
1110 return mmc_send_status(host->card, NULL);
1114 * Card detection callback from host.
1116 static void mmc_sd_detect(struct mmc_host *host)
1120 mmc_get_card(host->card, NULL);
1123 * Just check if our card has been removed.
1125 err = _mmc_detect_card_removed(host);
1127 mmc_put_card(host->card, NULL);
1130 mmc_sd_remove(host);
1132 mmc_claim_host(host);
1133 mmc_detach_bus(host);
1134 mmc_power_off(host);
1135 mmc_release_host(host);
1139 static int _mmc_sd_suspend(struct mmc_host *host)
1143 mmc_claim_host(host);
1145 if (mmc_card_suspended(host->card))
1148 if (!mmc_host_is_spi(host))
1149 err = mmc_deselect_cards(host);
1152 mmc_power_off(host);
1153 mmc_card_set_suspended(host->card);
1157 mmc_release_host(host);
1162 * Callback for suspend
1164 static int mmc_sd_suspend(struct mmc_host *host)
1168 err = _mmc_sd_suspend(host);
1170 pm_runtime_disable(&host->card->dev);
1171 pm_runtime_set_suspended(&host->card->dev);
1178 * This function tries to determine if the same card is still present
1179 * and, if so, restore all state to it.
1181 static int _mmc_sd_resume(struct mmc_host *host)
1185 mmc_claim_host(host);
1187 if (!mmc_card_suspended(host->card))
1190 mmc_power_up(host, host->card->ocr);
1191 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1192 mmc_card_clr_suspended(host->card);
1195 mmc_release_host(host);
1200 * Callback for resume
1202 static int mmc_sd_resume(struct mmc_host *host)
1204 pm_runtime_enable(&host->card->dev);
1209 * Callback for runtime_suspend.
1211 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1215 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1218 err = _mmc_sd_suspend(host);
1220 pr_err("%s: error %d doing aggressive suspend\n",
1221 mmc_hostname(host), err);
1227 * Callback for runtime_resume.
1229 static int mmc_sd_runtime_resume(struct mmc_host *host)
1233 err = _mmc_sd_resume(host);
1234 if (err && err != -ENOMEDIUM)
1235 pr_err("%s: error %d doing runtime resume\n",
1236 mmc_hostname(host), err);
1241 static int mmc_sd_hw_reset(struct mmc_host *host)
1243 mmc_power_cycle(host, host->card->ocr);
1244 return mmc_sd_init_card(host, host->card->ocr, host->card);
1247 static const struct mmc_bus_ops mmc_sd_ops = {
1248 .remove = mmc_sd_remove,
1249 .detect = mmc_sd_detect,
1250 .runtime_suspend = mmc_sd_runtime_suspend,
1251 .runtime_resume = mmc_sd_runtime_resume,
1252 .suspend = mmc_sd_suspend,
1253 .resume = mmc_sd_resume,
1254 .alive = mmc_sd_alive,
1255 .shutdown = mmc_sd_suspend,
1256 .hw_reset = mmc_sd_hw_reset,
1260 * Starting point for SD card init.
1262 int mmc_attach_sd(struct mmc_host *host)
1267 WARN_ON(!host->claimed);
1269 err = mmc_send_app_op_cond(host, 0, &ocr);
1273 mmc_attach_bus(host, &mmc_sd_ops);
1274 if (host->ocr_avail_sd)
1275 host->ocr_avail = host->ocr_avail_sd;
1278 * We need to get OCR a different way for SPI.
1280 if (mmc_host_is_spi(host)) {
1283 err = mmc_spi_read_ocr(host, 0, &ocr);
1289 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1290 * these bits as being in-valid and especially also bit7.
1294 rocr = mmc_select_voltage(host, ocr);
1297 * Can we support the voltage(s) of the card(s)?
1305 * Detect and init the card.
1307 err = mmc_sd_init_card(host, rocr, NULL);
1311 mmc_release_host(host);
1312 err = mmc_add_card(host->card);
1316 mmc_claim_host(host);
1320 mmc_remove_card(host->card);
1322 mmc_claim_host(host);
1324 mmc_detach_bus(host);
1326 pr_err("%s: error %d whilst initialising SD card\n",
1327 mmc_hostname(host), err);