2 * linux/drivers/mmc/core/sd.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/err.h>
14 #include <linux/sizes.h>
15 #include <linux/slab.h>
16 #include <linux/stat.h>
17 #include <linux/pm_runtime.h>
19 #include <linux/mmc/host.h>
20 #include <linux/mmc/card.h>
21 #include <linux/mmc/mmc.h>
22 #include <linux/mmc/sd.h>
30 static const unsigned int tran_exp[] = {
31 10000, 100000, 1000000, 10000000,
35 static const unsigned char tran_mant[] = {
36 0, 10, 12, 13, 15, 20, 25, 30,
37 35, 40, 45, 50, 55, 60, 70, 80,
40 static const unsigned int tacc_exp[] = {
41 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
44 static const unsigned int tacc_mant[] = {
45 0, 10, 12, 13, 15, 20, 25, 30,
46 35, 40, 45, 50, 55, 60, 70, 80,
49 static const unsigned int sd_au_size[] = {
50 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
51 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
52 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
53 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
56 #define UNSTUFF_BITS(resp,start,size) \
58 const int __size = size; \
59 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
60 const int __off = 3 - ((start) / 32); \
61 const int __shft = (start) & 31; \
64 __res = resp[__off] >> __shft; \
65 if (__size + __shft > 32) \
66 __res |= resp[__off-1] << ((32 - __shft) % 32); \
71 * Given the decoded CSD structure, decode the raw CID to our CID structure.
73 void mmc_decode_cid(struct mmc_card *card)
75 u32 *resp = card->raw_cid;
77 memset(&card->cid, 0, sizeof(struct mmc_cid));
80 * SD doesn't currently have a version field so we will
81 * have to assume we can parse this.
83 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
84 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
85 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
86 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
87 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
88 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
89 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
90 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
91 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
92 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
93 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
94 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
96 card->cid.year += 2000; /* SD cards year offset */
100 * Given a 128-bit response, decode to our card CSD structure.
102 static int mmc_decode_csd(struct mmc_card *card)
104 struct mmc_csd *csd = &card->csd;
105 unsigned int e, m, csd_struct;
106 u32 *resp = card->raw_csd;
108 csd_struct = UNSTUFF_BITS(resp, 126, 2);
110 switch (csd_struct) {
112 m = UNSTUFF_BITS(resp, 115, 4);
113 e = UNSTUFF_BITS(resp, 112, 3);
114 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
115 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
117 m = UNSTUFF_BITS(resp, 99, 4);
118 e = UNSTUFF_BITS(resp, 96, 3);
119 csd->max_dtr = tran_exp[e] * tran_mant[m];
120 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
122 e = UNSTUFF_BITS(resp, 47, 3);
123 m = UNSTUFF_BITS(resp, 62, 12);
124 csd->capacity = (1 + m) << (e + 2);
126 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
127 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
128 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
129 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
130 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
131 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
132 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
133 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
135 if (UNSTUFF_BITS(resp, 46, 1)) {
137 } else if (csd->write_blkbits >= 9) {
138 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
139 csd->erase_size <<= csd->write_blkbits - 9;
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->tacc_ns = 0; /* Unused */
155 csd->tacc_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 ssr = kmalloc(64, GFP_KERNEL);
255 err = mmc_app_sd_status(card, ssr);
257 pr_warn("%s: problem reading SD Status register\n",
258 mmc_hostname(card->host));
263 for (i = 0; i < 16; i++)
264 ssr[i] = be32_to_cpu(ssr[i]);
267 * UNSTUFF_BITS only works with four u32s so we have to offset the
268 * bitfield positions accordingly.
270 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
272 if (au <= 9 || card->scr.sda_spec3) {
273 card->ssr.au = sd_au_size[au];
274 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
275 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
277 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
278 card->ssr.erase_timeout = (et * 1000) / es;
279 card->ssr.erase_offset = eo * 1000;
282 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
283 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);
312 pr_err("%s: could not allocate a buffer for "
313 "switch capabilities.\n",
314 mmc_hostname(card->host));
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);
377 pr_err("%s: could not allocate a buffer for "
378 "switch capabilities.\n", mmc_hostname(card->host));
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->scr.sda_spec3)
609 if (!(card->csd.cmdclass & CCC_SWITCH))
612 status = kmalloc(64, GFP_KERNEL);
614 pr_err("%s: could not allocate a buffer for "
615 "switch capabilities.\n", mmc_hostname(card->host));
619 /* Set 4-bit bus width */
620 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
621 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
622 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
626 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
630 * Select the bus speed mode depending on host
631 * and card capability.
633 sd_update_bus_speed_mode(card);
635 /* Set the driver strength for the card */
636 err = sd_select_driver_type(card, status);
640 /* Set current limit for the card */
641 err = sd_set_current_limit(card, status);
645 /* Set bus speed mode of the card */
646 err = sd_set_bus_speed_mode(card, status);
651 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
652 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
654 if (!mmc_host_is_spi(card->host) &&
655 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
656 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
657 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
658 err = mmc_execute_tuning(card);
661 * As SD Specifications Part1 Physical Layer Specification
662 * Version 3.01 says, CMD19 tuning is available for unlocked
663 * cards in transfer state of 1.8V signaling mode. The small
664 * difference between v3.00 and 3.01 spec means that CMD19
665 * tuning is also available for DDR50 mode.
667 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
668 pr_warn("%s: ddr50 tuning failed\n",
669 mmc_hostname(card->host));
680 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
681 card->raw_cid[2], card->raw_cid[3]);
682 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
683 card->raw_csd[2], card->raw_csd[3]);
684 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
685 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
686 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
687 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
688 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
689 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
690 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
691 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
692 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
693 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
696 static struct attribute *sd_std_attrs[] = {
701 &dev_attr_erase_size.attr,
702 &dev_attr_preferred_erase_size.attr,
703 &dev_attr_fwrev.attr,
704 &dev_attr_hwrev.attr,
705 &dev_attr_manfid.attr,
707 &dev_attr_oemid.attr,
708 &dev_attr_serial.attr,
711 ATTRIBUTE_GROUPS(sd_std);
713 struct device_type sd_type = {
714 .groups = sd_std_groups,
718 * Fetch CID from card.
720 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
730 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
734 * Since we're changing the OCR value, we seem to
735 * need to tell some cards to go back to the idle
736 * state. We wait 1ms to give cards time to
742 * If SD_SEND_IF_COND indicates an SD 2.0
743 * compliant card and we should set bit 30
744 * of the ocr to indicate that we can handle
745 * block-addressed SDHC cards.
747 err = mmc_send_if_cond(host, ocr);
752 * If the host supports one of UHS-I modes, request the card
753 * to switch to 1.8V signaling level. If the card has failed
754 * repeatedly to switch however, skip this.
756 if (retries && mmc_host_uhs(host))
760 * If the host can supply more than 150mA at current voltage,
761 * XPC should be set to 1.
763 max_current = sd_get_host_max_current(host);
764 if (max_current > 150)
767 err = mmc_send_app_op_cond(host, ocr, rocr);
772 * In case CCS and S18A in the response is set, start Signal Voltage
773 * Switch procedure. SPI mode doesn't support CMD11.
775 if (!mmc_host_is_spi(host) && rocr &&
776 ((*rocr & 0x41000000) == 0x41000000)) {
777 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
779 if (err == -EAGAIN) {
788 if (mmc_host_is_spi(host))
789 err = mmc_send_cid(host, cid);
791 err = mmc_all_send_cid(host, cid);
796 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
801 * Fetch CSD from card.
803 err = mmc_send_csd(card, card->raw_csd);
807 err = mmc_decode_csd(card);
814 static int mmc_sd_get_ro(struct mmc_host *host)
819 * Some systems don't feature a write-protect pin and don't need one.
820 * E.g. because they only have micro-SD card slot. For those systems
821 * assume that the SD card is always read-write.
823 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
826 if (!host->ops->get_ro)
829 ro = host->ops->get_ro(host);
834 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
841 * Fetch SCR from card.
843 err = mmc_app_send_scr(card, card->raw_scr);
847 err = mmc_decode_scr(card);
852 * Fetch and process SD Status register.
854 err = mmc_read_ssr(card);
858 /* Erase init depends on CSD and SSR */
859 mmc_init_erase(card);
862 * Fetch switch information from card.
864 err = mmc_read_switch(card);
870 * For SPI, enable CRC as appropriate.
871 * This CRC enable is located AFTER the reading of the
872 * card registers because some SDHC cards are not able
873 * to provide valid CRCs for non-512-byte blocks.
875 if (mmc_host_is_spi(host)) {
876 err = mmc_spi_set_crc(host, use_spi_crc);
882 * Check if read-only switch is active.
885 int ro = mmc_sd_get_ro(host);
888 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
891 mmc_card_set_readonly(card);
898 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
900 unsigned max_dtr = (unsigned int)-1;
902 if (mmc_card_hs(card)) {
903 if (max_dtr > card->sw_caps.hs_max_dtr)
904 max_dtr = card->sw_caps.hs_max_dtr;
905 } else if (max_dtr > card->csd.max_dtr) {
906 max_dtr = card->csd.max_dtr;
913 * Handle the detection and initialisation of a card.
915 * In the case of a resume, "oldcard" will contain the card
916 * we're trying to reinitialise.
918 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
919 struct mmc_card *oldcard)
921 struct mmc_card *card;
927 WARN_ON(!host->claimed);
929 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
934 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
940 * Allocate card structure.
942 card = mmc_alloc_card(host, &sd_type);
944 return PTR_ERR(card);
947 card->type = MMC_TYPE_SD;
948 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
952 * Call the optional HC's init_card function to handle quirks.
954 if (host->ops->init_card)
955 host->ops->init_card(host, card);
958 * For native busses: get card RCA and quit open drain mode.
960 if (!mmc_host_is_spi(host)) {
961 err = mmc_send_relative_addr(host, &card->rca);
967 err = mmc_sd_get_csd(host, card);
971 mmc_decode_cid(card);
975 * handling only for cards supporting DSR and hosts requesting
978 if (card->csd.dsr_imp && host->dsr_req)
982 * Select card, as all following commands rely on that.
984 if (!mmc_host_is_spi(host)) {
985 err = mmc_select_card(card);
990 err = mmc_sd_setup_card(host, card, oldcard != NULL);
994 /* Initialization sequence for UHS-I cards */
995 if (rocr & SD_ROCR_S18A) {
996 err = mmc_sd_init_uhs_card(card);
1001 * Attempt to change to high-speed (if supported)
1003 err = mmc_sd_switch_hs(card);
1005 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1012 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1015 * Switch to wider bus (if supported).
1017 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1018 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1019 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1023 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1032 mmc_remove_card(card);
1038 * Host is being removed. Free up the current card.
1040 static void mmc_sd_remove(struct mmc_host *host)
1043 BUG_ON(!host->card);
1045 mmc_remove_card(host->card);
1050 * Card detection - card is alive.
1052 static int mmc_sd_alive(struct mmc_host *host)
1054 return mmc_send_status(host->card, NULL);
1058 * Card detection callback from host.
1060 static void mmc_sd_detect(struct mmc_host *host)
1065 BUG_ON(!host->card);
1067 mmc_get_card(host->card);
1070 * Just check if our card has been removed.
1072 err = _mmc_detect_card_removed(host);
1074 mmc_put_card(host->card);
1077 mmc_sd_remove(host);
1079 mmc_claim_host(host);
1080 mmc_detach_bus(host);
1081 mmc_power_off(host);
1082 mmc_release_host(host);
1086 static int _mmc_sd_suspend(struct mmc_host *host)
1091 BUG_ON(!host->card);
1093 mmc_claim_host(host);
1095 if (mmc_card_suspended(host->card))
1098 if (!mmc_host_is_spi(host))
1099 err = mmc_deselect_cards(host);
1102 mmc_power_off(host);
1103 mmc_card_set_suspended(host->card);
1107 mmc_release_host(host);
1112 * Callback for suspend
1114 static int mmc_sd_suspend(struct mmc_host *host)
1118 err = _mmc_sd_suspend(host);
1120 pm_runtime_disable(&host->card->dev);
1121 pm_runtime_set_suspended(&host->card->dev);
1128 * This function tries to determine if the same card is still present
1129 * and, if so, restore all state to it.
1131 static int _mmc_sd_resume(struct mmc_host *host)
1136 BUG_ON(!host->card);
1138 mmc_claim_host(host);
1140 if (!mmc_card_suspended(host->card))
1143 mmc_power_up(host, host->card->ocr);
1144 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1145 mmc_card_clr_suspended(host->card);
1148 mmc_release_host(host);
1153 * Callback for resume
1155 static int mmc_sd_resume(struct mmc_host *host)
1159 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1160 err = _mmc_sd_resume(host);
1161 pm_runtime_set_active(&host->card->dev);
1162 pm_runtime_mark_last_busy(&host->card->dev);
1164 pm_runtime_enable(&host->card->dev);
1170 * Callback for runtime_suspend.
1172 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1176 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1179 err = _mmc_sd_suspend(host);
1181 pr_err("%s: error %d doing aggressive suspend\n",
1182 mmc_hostname(host), err);
1188 * Callback for runtime_resume.
1190 static int mmc_sd_runtime_resume(struct mmc_host *host)
1194 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1197 err = _mmc_sd_resume(host);
1199 pr_err("%s: error %d doing aggressive resume\n",
1200 mmc_hostname(host), err);
1205 static int mmc_sd_reset(struct mmc_host *host)
1207 mmc_power_cycle(host, host->card->ocr);
1208 return mmc_sd_init_card(host, host->card->ocr, host->card);
1211 static const struct mmc_bus_ops mmc_sd_ops = {
1212 .remove = mmc_sd_remove,
1213 .detect = mmc_sd_detect,
1214 .runtime_suspend = mmc_sd_runtime_suspend,
1215 .runtime_resume = mmc_sd_runtime_resume,
1216 .suspend = mmc_sd_suspend,
1217 .resume = mmc_sd_resume,
1218 .alive = mmc_sd_alive,
1219 .shutdown = mmc_sd_suspend,
1220 .reset = mmc_sd_reset,
1224 * Starting point for SD card init.
1226 int mmc_attach_sd(struct mmc_host *host)
1232 WARN_ON(!host->claimed);
1234 err = mmc_send_app_op_cond(host, 0, &ocr);
1238 mmc_attach_bus(host, &mmc_sd_ops);
1239 if (host->ocr_avail_sd)
1240 host->ocr_avail = host->ocr_avail_sd;
1243 * We need to get OCR a different way for SPI.
1245 if (mmc_host_is_spi(host)) {
1248 err = mmc_spi_read_ocr(host, 0, &ocr);
1254 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1255 * these bits as being in-valid and especially also bit7.
1259 rocr = mmc_select_voltage(host, ocr);
1262 * Can we support the voltage(s) of the card(s)?
1270 * Detect and init the card.
1272 err = mmc_sd_init_card(host, rocr, NULL);
1276 mmc_release_host(host);
1277 err = mmc_add_card(host->card);
1281 mmc_claim_host(host);
1285 mmc_remove_card(host->card);
1287 mmc_claim_host(host);
1289 mmc_detach_bus(host);
1291 pr_err("%s: error %d whilst initialising SD card\n",
1292 mmc_hostname(host), err);