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->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
131 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
132 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
134 if (UNSTUFF_BITS(resp, 46, 1)) {
136 } else if (csd->write_blkbits >= 9) {
137 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
138 csd->erase_size <<= csd->write_blkbits - 9;
143 * This is a block-addressed SDHC or SDXC card. Most
144 * interesting fields are unused and have fixed
145 * values. To avoid getting tripped by buggy cards,
146 * we assume those fixed values ourselves.
148 mmc_card_set_blockaddr(card);
150 csd->tacc_ns = 0; /* Unused */
151 csd->tacc_clks = 0; /* Unused */
153 m = UNSTUFF_BITS(resp, 99, 4);
154 e = UNSTUFF_BITS(resp, 96, 3);
155 csd->max_dtr = tran_exp[e] * tran_mant[m];
156 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
157 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
159 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
160 if (csd->c_size >= 0xFFFF)
161 mmc_card_set_ext_capacity(card);
163 m = UNSTUFF_BITS(resp, 48, 22);
164 csd->capacity = (1 + m) << 10;
166 csd->read_blkbits = 9;
167 csd->read_partial = 0;
168 csd->write_misalign = 0;
169 csd->read_misalign = 0;
170 csd->r2w_factor = 4; /* Unused */
171 csd->write_blkbits = 9;
172 csd->write_partial = 0;
176 pr_err("%s: unrecognised CSD structure version %d\n",
177 mmc_hostname(card->host), csd_struct);
181 card->erase_size = csd->erase_size;
187 * Given a 64-bit response, decode to our card SCR structure.
189 static int mmc_decode_scr(struct mmc_card *card)
191 struct sd_scr *scr = &card->scr;
192 unsigned int scr_struct;
195 resp[3] = card->raw_scr[1];
196 resp[2] = card->raw_scr[0];
198 scr_struct = UNSTUFF_BITS(resp, 60, 4);
199 if (scr_struct != 0) {
200 pr_err("%s: unrecognised SCR structure version %d\n",
201 mmc_hostname(card->host), scr_struct);
205 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
206 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
207 if (scr->sda_vsn == SCR_SPEC_VER_2)
208 /* Check if Physical Layer Spec v3.0 is supported */
209 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
211 if (UNSTUFF_BITS(resp, 55, 1))
212 card->erased_byte = 0xFF;
214 card->erased_byte = 0x0;
217 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
222 * Fetch and process SD Status register.
224 static int mmc_read_ssr(struct mmc_card *card)
226 unsigned int au, es, et, eo;
230 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
231 pr_warning("%s: card lacks mandatory SD Status "
232 "function.\n", mmc_hostname(card->host));
236 ssr = kmalloc(64, GFP_KERNEL);
240 err = mmc_app_sd_status(card, ssr);
242 pr_warning("%s: problem reading SD Status "
243 "register.\n", mmc_hostname(card->host));
248 for (i = 0; i < 16; i++)
249 ssr[i] = be32_to_cpu(ssr[i]);
252 * UNSTUFF_BITS only works with four u32s so we have to offset the
253 * bitfield positions accordingly.
255 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
257 if (au <= 9 || card->scr.sda_spec3) {
258 card->ssr.au = sd_au_size[au];
259 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
260 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
262 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
263 card->ssr.erase_timeout = (et * 1000) / es;
264 card->ssr.erase_offset = eo * 1000;
267 pr_warning("%s: SD Status: Invalid Allocation Unit size.\n",
268 mmc_hostname(card->host));
277 * Fetches and decodes switch information
279 static int mmc_read_switch(struct mmc_card *card)
284 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
287 if (!(card->csd.cmdclass & CCC_SWITCH)) {
288 pr_warning("%s: card lacks mandatory switch "
289 "function, performance might suffer.\n",
290 mmc_hostname(card->host));
296 status = kmalloc(64, GFP_KERNEL);
298 pr_err("%s: could not allocate a buffer for "
299 "switch capabilities.\n",
300 mmc_hostname(card->host));
305 * Find out the card's support bits with a mode 0 operation.
306 * The argument does not matter, as the support bits do not
307 * change with the arguments.
309 err = mmc_sd_switch(card, 0, 0, 0, status);
312 * If the host or the card can't do the switch,
313 * fail more gracefully.
315 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
318 pr_warning("%s: problem reading Bus Speed modes.\n",
319 mmc_hostname(card->host));
325 if (status[13] & SD_MODE_HIGH_SPEED)
326 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
328 if (card->scr.sda_spec3) {
329 card->sw_caps.sd3_bus_mode = status[13];
330 /* Driver Strengths supported by the card */
331 card->sw_caps.sd3_drv_type = status[9];
332 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
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 * The above is incorrect: if we try to set a current limit that is
587 * not supported by the card, the card can rightfully error out the
588 * attempt, and remain at the default current limit. This results
589 * in a 300mA card being limited to 200mA even though the host
590 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
591 * an iMX6 host. --rmk
593 if (max_current >= 800 &&
594 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
595 current_limit = SD_SET_CURRENT_LIMIT_800;
596 else if (max_current >= 600 &&
597 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
598 current_limit = SD_SET_CURRENT_LIMIT_600;
599 else if (max_current >= 400 &&
600 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
601 current_limit = SD_SET_CURRENT_LIMIT_400;
602 else if (max_current >= 200 &&
603 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
604 current_limit = SD_SET_CURRENT_LIMIT_200;
606 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
607 err = mmc_sd_switch(card, 1, 3, current_limit, status);
611 if (((status[15] >> 4) & 0x0F) != current_limit)
612 pr_warning("%s: Problem setting current limit!\n",
613 mmc_hostname(card->host));
621 * UHS-I specific initialization procedure
623 static int mmc_sd_init_uhs_card(struct mmc_card *card)
628 if (!card->scr.sda_spec3)
631 if (!(card->csd.cmdclass & CCC_SWITCH))
634 status = kmalloc(64, GFP_KERNEL);
636 pr_err("%s: could not allocate a buffer for "
637 "switch capabilities.\n", mmc_hostname(card->host));
641 /* Set 4-bit bus width */
642 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
643 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
644 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
648 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
652 * Select the bus speed mode depending on host
653 * and card capability.
655 sd_update_bus_speed_mode(card);
657 /* Set the driver strength for the card */
658 err = sd_select_driver_type(card, status);
662 /* Set current limit for the card */
663 err = sd_set_current_limit(card, status);
667 /* Set bus speed mode of the card */
668 err = sd_set_bus_speed_mode(card, status);
673 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
674 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
676 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning &&
677 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED ||
678 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) {
679 mmc_host_clk_hold(card->host);
680 err = card->host->ops->execute_tuning(card->host,
681 MMC_SEND_TUNING_BLOCK);
682 mmc_host_clk_release(card->host);
691 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
692 card->raw_cid[2], card->raw_cid[3]);
693 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
694 card->raw_csd[2], card->raw_csd[3]);
695 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
696 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
697 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
698 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
699 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
700 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
701 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
702 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
703 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
704 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
707 static struct attribute *sd_std_attrs[] = {
712 &dev_attr_erase_size.attr,
713 &dev_attr_preferred_erase_size.attr,
714 &dev_attr_fwrev.attr,
715 &dev_attr_hwrev.attr,
716 &dev_attr_manfid.attr,
718 &dev_attr_oemid.attr,
719 &dev_attr_serial.attr,
722 ATTRIBUTE_GROUPS(sd_std);
724 struct device_type sd_type = {
725 .groups = sd_std_groups,
729 * Fetch CID from card.
731 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
741 pr_warning("%s: Skipping voltage switch\n",
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 CCS and S18A in the response is set, start Signal Voltage
785 * Switch procedure. SPI mode doesn't support CMD11.
787 if (!mmc_host_is_spi(host) && rocr &&
788 ((*rocr & 0x41000000) == 0x41000000)) {
789 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
791 if (err == -EAGAIN) {
800 if (mmc_host_is_spi(host))
801 err = mmc_send_cid(host, cid);
803 err = mmc_all_send_cid(host, cid);
808 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
813 * Fetch CSD from card.
815 err = mmc_send_csd(card, card->raw_csd);
819 err = mmc_decode_csd(card);
826 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
833 * Fetch SCR from card.
835 err = mmc_app_send_scr(card, card->raw_scr);
839 err = mmc_decode_scr(card);
844 * Fetch and process SD Status register.
846 err = mmc_read_ssr(card);
850 /* Erase init depends on CSD and SSR */
851 mmc_init_erase(card);
854 * Fetch switch information from card.
856 err = mmc_read_switch(card);
862 * For SPI, enable CRC as appropriate.
863 * This CRC enable is located AFTER the reading of the
864 * card registers because some SDHC cards are not able
865 * to provide valid CRCs for non-512-byte blocks.
867 if (mmc_host_is_spi(host)) {
868 err = mmc_spi_set_crc(host, use_spi_crc);
874 * Check if read-only switch is active.
879 if (host->ops->get_ro) {
880 mmc_host_clk_hold(card->host);
881 ro = host->ops->get_ro(host);
882 mmc_host_clk_release(card->host);
886 pr_warning("%s: host does not "
887 "support reading read-only "
888 "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 * For native busses: get card RCA and quit open drain mode.
954 if (!mmc_host_is_spi(host)) {
955 err = mmc_send_relative_addr(host, &card->rca);
961 err = mmc_sd_get_csd(host, card);
965 mmc_decode_cid(card);
969 * Select card, as all following commands rely on that.
971 if (!mmc_host_is_spi(host)) {
972 err = mmc_select_card(card);
977 err = mmc_sd_setup_card(host, card, oldcard != NULL);
981 /* Initialization sequence for UHS-I cards */
982 if (rocr & SD_ROCR_S18A) {
983 err = mmc_sd_init_uhs_card(card);
988 * Attempt to change to high-speed (if supported)
990 err = mmc_sd_switch_hs(card);
992 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
999 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1002 * Switch to wider bus (if supported).
1004 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1005 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1006 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1010 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1019 mmc_remove_card(card);
1025 * Host is being removed. Free up the current card.
1027 static void mmc_sd_remove(struct mmc_host *host)
1030 BUG_ON(!host->card);
1032 mmc_remove_card(host->card);
1037 * Card detection - card is alive.
1039 static int mmc_sd_alive(struct mmc_host *host)
1041 return mmc_send_status(host->card, NULL);
1045 * Card detection callback from host.
1047 static void mmc_sd_detect(struct mmc_host *host)
1052 BUG_ON(!host->card);
1054 mmc_get_card(host->card);
1057 * Just check if our card has been removed.
1059 err = _mmc_detect_card_removed(host);
1061 mmc_put_card(host->card);
1064 mmc_sd_remove(host);
1066 mmc_claim_host(host);
1067 mmc_detach_bus(host);
1068 mmc_power_off(host);
1069 mmc_release_host(host);
1073 static int _mmc_sd_suspend(struct mmc_host *host)
1078 BUG_ON(!host->card);
1080 mmc_claim_host(host);
1082 if (mmc_card_suspended(host->card))
1085 if (!mmc_host_is_spi(host))
1086 err = mmc_deselect_cards(host);
1089 mmc_power_off(host);
1090 mmc_card_set_suspended(host->card);
1094 mmc_release_host(host);
1099 * Callback for suspend
1101 static int mmc_sd_suspend(struct mmc_host *host)
1105 err = _mmc_sd_suspend(host);
1107 pm_runtime_disable(&host->card->dev);
1108 pm_runtime_set_suspended(&host->card->dev);
1115 * This function tries to determine if the same card is still present
1116 * and, if so, restore all state to it.
1118 static int _mmc_sd_resume(struct mmc_host *host)
1123 BUG_ON(!host->card);
1125 mmc_claim_host(host);
1127 if (!mmc_card_suspended(host->card))
1130 mmc_power_up(host, host->card->ocr);
1131 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1132 mmc_card_clr_suspended(host->card);
1135 mmc_release_host(host);
1140 * Callback for resume
1142 static int mmc_sd_resume(struct mmc_host *host)
1146 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1147 err = _mmc_sd_resume(host);
1148 pm_runtime_set_active(&host->card->dev);
1149 pm_runtime_mark_last_busy(&host->card->dev);
1151 pm_runtime_enable(&host->card->dev);
1157 * Callback for runtime_suspend.
1159 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1163 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1166 err = _mmc_sd_suspend(host);
1168 pr_err("%s: error %d doing aggessive suspend\n",
1169 mmc_hostname(host), err);
1175 * Callback for runtime_resume.
1177 static int mmc_sd_runtime_resume(struct mmc_host *host)
1181 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1184 err = _mmc_sd_resume(host);
1186 pr_err("%s: error %d doing aggessive resume\n",
1187 mmc_hostname(host), err);
1192 static int mmc_sd_power_restore(struct mmc_host *host)
1196 mmc_claim_host(host);
1197 ret = mmc_sd_init_card(host, host->card->ocr, host->card);
1198 mmc_release_host(host);
1203 static const struct mmc_bus_ops mmc_sd_ops = {
1204 .remove = mmc_sd_remove,
1205 .detect = mmc_sd_detect,
1206 .runtime_suspend = mmc_sd_runtime_suspend,
1207 .runtime_resume = mmc_sd_runtime_resume,
1208 .suspend = mmc_sd_suspend,
1209 .resume = mmc_sd_resume,
1210 .power_restore = mmc_sd_power_restore,
1211 .alive = mmc_sd_alive,
1212 .shutdown = mmc_sd_suspend,
1216 * Starting point for SD card init.
1218 int mmc_attach_sd(struct mmc_host *host)
1224 WARN_ON(!host->claimed);
1226 err = mmc_send_app_op_cond(host, 0, &ocr);
1230 mmc_attach_bus(host, &mmc_sd_ops);
1231 if (host->ocr_avail_sd)
1232 host->ocr_avail = host->ocr_avail_sd;
1235 * We need to get OCR a different way for SPI.
1237 if (mmc_host_is_spi(host)) {
1240 err = mmc_spi_read_ocr(host, 0, &ocr);
1246 * Some SD cards claims an out of spec VDD voltage range. Let's treat
1247 * these bits as being in-valid and especially also bit7.
1251 rocr = mmc_select_voltage(host, ocr);
1254 * Can we support the voltage(s) of the card(s)?
1262 * Detect and init the card.
1264 err = mmc_sd_init_card(host, rocr, NULL);
1268 mmc_release_host(host);
1269 err = mmc_add_card(host->card);
1270 mmc_claim_host(host);
1277 mmc_release_host(host);
1278 mmc_remove_card(host->card);
1280 mmc_claim_host(host);
1282 mmc_detach_bus(host);
1284 pr_err("%s: error %d whilst initialising SD card\n",
1285 mmc_hostname(host), err);