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;
144 * This is a block-addressed SDHC or SDXC card. Most
145 * interesting fields are unused and have fixed
146 * values. To avoid getting tripped by buggy cards,
147 * we assume those fixed values ourselves.
149 mmc_card_set_blockaddr(card);
151 csd->tacc_ns = 0; /* Unused */
152 csd->tacc_clks = 0; /* Unused */
154 m = UNSTUFF_BITS(resp, 99, 4);
155 e = UNSTUFF_BITS(resp, 96, 3);
156 csd->max_dtr = tran_exp[e] * tran_mant[m];
157 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
158 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
160 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
161 if (csd->c_size >= 0xFFFF)
162 mmc_card_set_ext_capacity(card);
164 m = UNSTUFF_BITS(resp, 48, 22);
165 csd->capacity = (1 + m) << 10;
167 csd->read_blkbits = 9;
168 csd->read_partial = 0;
169 csd->write_misalign = 0;
170 csd->read_misalign = 0;
171 csd->r2w_factor = 4; /* Unused */
172 csd->write_blkbits = 9;
173 csd->write_partial = 0;
177 pr_err("%s: unrecognised CSD structure version %d\n",
178 mmc_hostname(card->host), csd_struct);
182 card->erase_size = csd->erase_size;
188 * Given a 64-bit response, decode to our card SCR structure.
190 static int mmc_decode_scr(struct mmc_card *card)
192 struct sd_scr *scr = &card->scr;
193 unsigned int scr_struct;
196 resp[3] = card->raw_scr[1];
197 resp[2] = card->raw_scr[0];
199 scr_struct = UNSTUFF_BITS(resp, 60, 4);
200 if (scr_struct != 0) {
201 pr_err("%s: unrecognised SCR structure version %d\n",
202 mmc_hostname(card->host), scr_struct);
206 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
207 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
208 if (scr->sda_vsn == SCR_SPEC_VER_2)
209 /* Check if Physical Layer Spec v3.0 is supported */
210 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
212 if (UNSTUFF_BITS(resp, 55, 1))
213 card->erased_byte = 0xFF;
215 card->erased_byte = 0x0;
218 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
223 * Fetch and process SD Status register.
225 static int mmc_read_ssr(struct mmc_card *card)
227 unsigned int au, es, et, eo;
231 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
232 pr_warning("%s: card lacks mandatory SD Status "
233 "function.\n", mmc_hostname(card->host));
237 ssr = kmalloc(64, GFP_KERNEL);
241 err = mmc_app_sd_status(card, ssr);
243 pr_warning("%s: problem reading SD Status "
244 "register.\n", mmc_hostname(card->host));
249 for (i = 0; i < 16; i++)
250 ssr[i] = be32_to_cpu(ssr[i]);
253 * UNSTUFF_BITS only works with four u32s so we have to offset the
254 * bitfield positions accordingly.
256 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
258 if (au <= 9 || card->scr.sda_spec3) {
259 card->ssr.au = sd_au_size[au];
260 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
261 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
263 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
264 card->ssr.erase_timeout = (et * 1000) / es;
265 card->ssr.erase_offset = eo * 1000;
268 pr_warning("%s: SD Status: Invalid Allocation Unit size.\n",
269 mmc_hostname(card->host));
278 * Fetches and decodes switch information
280 static int mmc_read_switch(struct mmc_card *card)
285 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
288 if (!(card->csd.cmdclass & CCC_SWITCH)) {
289 pr_warning("%s: card lacks mandatory switch "
290 "function, performance might suffer.\n",
291 mmc_hostname(card->host));
297 status = kmalloc(64, GFP_KERNEL);
299 pr_err("%s: could not allocate a buffer for "
300 "switch capabilities.\n",
301 mmc_hostname(card->host));
306 * Find out the card's support bits with a mode 0 operation.
307 * The argument does not matter, as the support bits do not
308 * change with the arguments.
310 err = mmc_sd_switch(card, 0, 0, 0, status);
313 * If the host or the card can't do the switch,
314 * fail more gracefully.
316 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
319 pr_warning("%s: problem reading Bus Speed modes.\n",
320 mmc_hostname(card->host));
326 if (status[13] & SD_MODE_HIGH_SPEED)
327 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
329 if (card->scr.sda_spec3) {
330 card->sw_caps.sd3_bus_mode = status[13];
331 /* Driver Strengths supported by the card */
332 card->sw_caps.sd3_drv_type = status[9];
342 * Test if the card supports high-speed mode and, if so, switch to it.
344 int mmc_sd_switch_hs(struct mmc_card *card)
349 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
352 if (!(card->csd.cmdclass & CCC_SWITCH))
355 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
358 if (card->sw_caps.hs_max_dtr == 0)
363 status = kmalloc(64, GFP_KERNEL);
365 pr_err("%s: could not allocate a buffer for "
366 "switch capabilities.\n", mmc_hostname(card->host));
370 err = mmc_sd_switch(card, 1, 0, 1, status);
374 if ((status[16] & 0xF) != 1) {
375 pr_warning("%s: Problem switching card "
376 "into high-speed mode!\n",
377 mmc_hostname(card->host));
389 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
391 int host_drv_type = SD_DRIVER_TYPE_B;
392 int card_drv_type = SD_DRIVER_TYPE_B;
397 * If the host doesn't support any of the Driver Types A,C or D,
398 * or there is no board specific handler then default Driver
401 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
402 | MMC_CAP_DRIVER_TYPE_D)))
405 if (!card->host->ops->select_drive_strength)
408 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
409 host_drv_type |= SD_DRIVER_TYPE_A;
411 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
412 host_drv_type |= SD_DRIVER_TYPE_C;
414 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
415 host_drv_type |= SD_DRIVER_TYPE_D;
417 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
418 card_drv_type |= SD_DRIVER_TYPE_A;
420 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
421 card_drv_type |= SD_DRIVER_TYPE_C;
423 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
424 card_drv_type |= SD_DRIVER_TYPE_D;
427 * The drive strength that the hardware can support
428 * depends on the board design. Pass the appropriate
429 * information and let the hardware specific code
430 * return what is possible given the options
432 mmc_host_clk_hold(card->host);
433 drive_strength = card->host->ops->select_drive_strength(
434 card->sw_caps.uhs_max_dtr,
435 host_drv_type, card_drv_type);
436 mmc_host_clk_release(card->host);
438 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
442 if ((status[15] & 0xF) != drive_strength) {
443 pr_warning("%s: Problem setting drive strength!\n",
444 mmc_hostname(card->host));
448 mmc_set_driver_type(card->host, drive_strength);
453 static void sd_update_bus_speed_mode(struct mmc_card *card)
456 * If the host doesn't support any of the UHS-I modes, fallback on
459 if (!mmc_host_uhs(card->host)) {
460 card->sd_bus_speed = 0;
464 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
465 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
466 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
467 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
468 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
469 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
470 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
471 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
472 SD_MODE_UHS_SDR50)) {
473 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
474 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
475 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
476 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
477 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
478 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
479 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
480 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
481 SD_MODE_UHS_SDR12)) {
482 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
486 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
489 unsigned int timing = 0;
491 switch (card->sd_bus_speed) {
492 case UHS_SDR104_BUS_SPEED:
493 timing = MMC_TIMING_UHS_SDR104;
494 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
496 case UHS_DDR50_BUS_SPEED:
497 timing = MMC_TIMING_UHS_DDR50;
498 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
500 case UHS_SDR50_BUS_SPEED:
501 timing = MMC_TIMING_UHS_SDR50;
502 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
504 case UHS_SDR25_BUS_SPEED:
505 timing = MMC_TIMING_UHS_SDR25;
506 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
508 case UHS_SDR12_BUS_SPEED:
509 timing = MMC_TIMING_UHS_SDR12;
510 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
516 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
520 if ((status[16] & 0xF) != card->sd_bus_speed)
521 pr_warning("%s: Problem setting bus speed mode!\n",
522 mmc_hostname(card->host));
524 mmc_set_timing(card->host, timing);
525 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
531 /* Get host's max current setting at its current voltage */
532 static u32 sd_get_host_max_current(struct mmc_host *host)
534 u32 voltage, max_current;
536 voltage = 1 << host->ios.vdd;
538 case MMC_VDD_165_195:
539 max_current = host->max_current_180;
543 max_current = host->max_current_300;
547 max_current = host->max_current_330;
556 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
558 int current_limit = SD_SET_CURRENT_NO_CHANGE;
563 * Current limit switch is only defined for SDR50, SDR104, and DDR50
564 * bus speed modes. For other bus speed modes, we do not change the
567 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
568 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
569 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
573 * Host has different current capabilities when operating at
574 * different voltages, so find out its max current first.
576 max_current = sd_get_host_max_current(card->host);
579 * We only check host's capability here, if we set a limit that is
580 * higher than the card's maximum current, the card will be using its
581 * maximum current, e.g. if the card's maximum current is 300ma, and
582 * when we set current limit to 200ma, the card will draw 200ma, and
583 * when we set current limit to 400/600/800ma, the card will draw its
584 * maximum 300ma from the host.
586 if (max_current >= 800)
587 current_limit = SD_SET_CURRENT_LIMIT_800;
588 else if (max_current >= 600)
589 current_limit = SD_SET_CURRENT_LIMIT_600;
590 else if (max_current >= 400)
591 current_limit = SD_SET_CURRENT_LIMIT_400;
592 else if (max_current >= 200)
593 current_limit = SD_SET_CURRENT_LIMIT_200;
595 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
596 err = mmc_sd_switch(card, 1, 3, current_limit, status);
600 if (((status[15] >> 4) & 0x0F) != current_limit)
601 pr_warning("%s: Problem setting current limit!\n",
602 mmc_hostname(card->host));
610 * UHS-I specific initialization procedure
612 static int mmc_sd_init_uhs_card(struct mmc_card *card)
617 if (!card->scr.sda_spec3)
620 if (!(card->csd.cmdclass & CCC_SWITCH))
623 status = kmalloc(64, GFP_KERNEL);
625 pr_err("%s: could not allocate a buffer for "
626 "switch capabilities.\n", mmc_hostname(card->host));
630 /* Set 4-bit bus width */
631 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
632 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
633 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
637 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
641 * Select the bus speed mode depending on host
642 * and card capability.
644 sd_update_bus_speed_mode(card);
646 /* Set the driver strength for the card */
647 err = sd_select_driver_type(card, status);
651 /* Set current limit for the card */
652 err = sd_set_current_limit(card, status);
656 /* Set bus speed mode of the card */
657 err = sd_set_bus_speed_mode(card, status);
662 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
663 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
665 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning &&
666 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED ||
667 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) {
668 mmc_host_clk_hold(card->host);
669 err = card->host->ops->execute_tuning(card->host,
670 MMC_SEND_TUNING_BLOCK);
671 mmc_host_clk_release(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_warning("%s: Skipping voltage switch\n",
735 * Since we're changing the OCR value, we seem to
736 * need to tell some cards to go back to the idle
737 * state. We wait 1ms to give cards time to
743 * If SD_SEND_IF_COND indicates an SD 2.0
744 * compliant card and we should set bit 30
745 * of the ocr to indicate that we can handle
746 * block-addressed SDHC cards.
748 err = mmc_send_if_cond(host, ocr);
753 * If the host supports one of UHS-I modes, request the card
754 * to switch to 1.8V signaling level. If the card has failed
755 * repeatedly to switch however, skip this.
757 if (retries && mmc_host_uhs(host))
761 * If the host can supply more than 150mA at current voltage,
762 * XPC should be set to 1.
764 max_current = sd_get_host_max_current(host);
765 if (max_current > 150)
768 err = mmc_send_app_op_cond(host, ocr, rocr);
773 * In case CCS and S18A in the response is set, start Signal Voltage
774 * Switch procedure. SPI mode doesn't support CMD11.
776 if (!mmc_host_is_spi(host) && rocr &&
777 ((*rocr & 0x41000000) == 0x41000000)) {
778 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
780 if (err == -EAGAIN) {
789 if (mmc_host_is_spi(host))
790 err = mmc_send_cid(host, cid);
792 err = mmc_all_send_cid(host, cid);
797 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
802 * Fetch CSD from card.
804 err = mmc_send_csd(card, card->raw_csd);
808 err = mmc_decode_csd(card);
815 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
822 * Fetch SCR from card.
824 err = mmc_app_send_scr(card, card->raw_scr);
828 err = mmc_decode_scr(card);
833 * Fetch and process SD Status register.
835 err = mmc_read_ssr(card);
839 /* Erase init depends on CSD and SSR */
840 mmc_init_erase(card);
843 * Fetch switch information from card.
845 err = mmc_read_switch(card);
851 * For SPI, enable CRC as appropriate.
852 * This CRC enable is located AFTER the reading of the
853 * card registers because some SDHC cards are not able
854 * to provide valid CRCs for non-512-byte blocks.
856 if (mmc_host_is_spi(host)) {
857 err = mmc_spi_set_crc(host, use_spi_crc);
863 * Check if read-only switch is active.
868 if (host->ops->get_ro) {
869 mmc_host_clk_hold(card->host);
870 ro = host->ops->get_ro(host);
871 mmc_host_clk_release(card->host);
875 pr_warning("%s: host does not "
876 "support reading read-only "
877 "switch. assuming write-enable.\n",
880 mmc_card_set_readonly(card);
887 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
889 unsigned max_dtr = (unsigned int)-1;
891 if (mmc_card_hs(card)) {
892 if (max_dtr > card->sw_caps.hs_max_dtr)
893 max_dtr = card->sw_caps.hs_max_dtr;
894 } else if (max_dtr > card->csd.max_dtr) {
895 max_dtr = card->csd.max_dtr;
902 * Handle the detection and initialisation of a card.
904 * In the case of a resume, "oldcard" will contain the card
905 * we're trying to reinitialise.
907 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
908 struct mmc_card *oldcard)
910 struct mmc_card *card;
916 WARN_ON(!host->claimed);
918 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
923 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
929 * Allocate card structure.
931 card = mmc_alloc_card(host, &sd_type);
933 return PTR_ERR(card);
936 card->type = MMC_TYPE_SD;
937 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
941 * For native busses: get card RCA and quit open drain mode.
943 if (!mmc_host_is_spi(host)) {
944 err = mmc_send_relative_addr(host, &card->rca);
950 err = mmc_sd_get_csd(host, card);
954 mmc_decode_cid(card);
958 * handling only for cards supporting DSR and hosts requesting
961 if (card->csd.dsr_imp && host->dsr_req)
965 * Select card, as all following commands rely on that.
967 if (!mmc_host_is_spi(host)) {
968 err = mmc_select_card(card);
973 err = mmc_sd_setup_card(host, card, oldcard != NULL);
977 /* Initialization sequence for UHS-I cards */
978 if (rocr & SD_ROCR_S18A) {
979 err = mmc_sd_init_uhs_card(card);
984 * Attempt to change to high-speed (if supported)
986 err = mmc_sd_switch_hs(card);
988 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
995 mmc_set_clock(host, mmc_sd_get_max_clock(card));
998 * Switch to wider bus (if supported).
1000 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1001 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1002 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1006 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1015 mmc_remove_card(card);
1021 * Host is being removed. Free up the current card.
1023 static void mmc_sd_remove(struct mmc_host *host)
1026 BUG_ON(!host->card);
1028 mmc_remove_card(host->card);
1033 * Card detection - card is alive.
1035 static int mmc_sd_alive(struct mmc_host *host)
1037 return mmc_send_status(host->card, NULL);
1041 * Card detection callback from host.
1043 static void mmc_sd_detect(struct mmc_host *host)
1048 BUG_ON(!host->card);
1050 mmc_get_card(host->card);
1053 * Just check if our card has been removed.
1055 err = _mmc_detect_card_removed(host);
1057 mmc_put_card(host->card);
1060 mmc_sd_remove(host);
1062 mmc_claim_host(host);
1063 mmc_detach_bus(host);
1064 mmc_power_off(host);
1065 mmc_release_host(host);
1069 static int _mmc_sd_suspend(struct mmc_host *host)
1074 BUG_ON(!host->card);
1076 mmc_claim_host(host);
1078 if (mmc_card_suspended(host->card))
1081 if (!mmc_host_is_spi(host))
1082 err = mmc_deselect_cards(host);
1085 mmc_power_off(host);
1086 mmc_card_set_suspended(host->card);
1090 mmc_release_host(host);
1095 * Callback for suspend
1097 static int mmc_sd_suspend(struct mmc_host *host)
1101 err = _mmc_sd_suspend(host);
1103 pm_runtime_disable(&host->card->dev);
1104 pm_runtime_set_suspended(&host->card->dev);
1111 * This function tries to determine if the same card is still present
1112 * and, if so, restore all state to it.
1114 static int _mmc_sd_resume(struct mmc_host *host)
1119 BUG_ON(!host->card);
1121 mmc_claim_host(host);
1123 if (!mmc_card_suspended(host->card))
1126 mmc_power_up(host, host->card->ocr);
1127 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1128 mmc_card_clr_suspended(host->card);
1131 mmc_release_host(host);
1136 * Callback for resume
1138 static int mmc_sd_resume(struct mmc_host *host)
1142 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1143 err = _mmc_sd_resume(host);
1144 pm_runtime_set_active(&host->card->dev);
1145 pm_runtime_mark_last_busy(&host->card->dev);
1147 pm_runtime_enable(&host->card->dev);
1153 * Callback for runtime_suspend.
1155 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1159 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1162 err = _mmc_sd_suspend(host);
1164 pr_err("%s: error %d doing aggessive suspend\n",
1165 mmc_hostname(host), err);
1171 * Callback for runtime_resume.
1173 static int mmc_sd_runtime_resume(struct mmc_host *host)
1177 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1180 err = _mmc_sd_resume(host);
1182 pr_err("%s: error %d doing aggessive resume\n",
1183 mmc_hostname(host), err);
1188 static int mmc_sd_power_restore(struct mmc_host *host)
1192 mmc_claim_host(host);
1193 ret = mmc_sd_init_card(host, host->card->ocr, host->card);
1194 mmc_release_host(host);
1199 static const struct mmc_bus_ops mmc_sd_ops = {
1200 .remove = mmc_sd_remove,
1201 .detect = mmc_sd_detect,
1202 .runtime_suspend = mmc_sd_runtime_suspend,
1203 .runtime_resume = mmc_sd_runtime_resume,
1204 .suspend = mmc_sd_suspend,
1205 .resume = mmc_sd_resume,
1206 .power_restore = mmc_sd_power_restore,
1207 .alive = mmc_sd_alive,
1208 .shutdown = mmc_sd_suspend,
1212 * Starting point for SD card init.
1214 int mmc_attach_sd(struct mmc_host *host)
1220 WARN_ON(!host->claimed);
1222 err = mmc_send_app_op_cond(host, 0, &ocr);
1226 mmc_attach_bus(host, &mmc_sd_ops);
1227 if (host->ocr_avail_sd)
1228 host->ocr_avail = host->ocr_avail_sd;
1231 * We need to get OCR a different way for SPI.
1233 if (mmc_host_is_spi(host)) {
1236 err = mmc_spi_read_ocr(host, 0, &ocr);
1241 rocr = mmc_select_voltage(host, ocr);
1244 * Can we support the voltage(s) of the card(s)?
1252 * Detect and init the card.
1254 err = mmc_sd_init_card(host, rocr, NULL);
1258 mmc_release_host(host);
1259 err = mmc_add_card(host->card);
1260 mmc_claim_host(host);
1267 mmc_release_host(host);
1268 mmc_remove_card(host->card);
1270 mmc_claim_host(host);
1272 mmc_detach_bus(host);
1274 pr_err("%s: error %d whilst initialising SD card\n",
1275 mmc_hostname(host), err);