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];
341 * Test if the card supports high-speed mode and, if so, switch to it.
343 int mmc_sd_switch_hs(struct mmc_card *card)
348 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
351 if (!(card->csd.cmdclass & CCC_SWITCH))
354 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
357 if (card->sw_caps.hs_max_dtr == 0)
362 status = kmalloc(64, GFP_KERNEL);
364 pr_err("%s: could not allocate a buffer for "
365 "switch capabilities.\n", mmc_hostname(card->host));
369 err = mmc_sd_switch(card, 1, 0, 1, status);
373 if ((status[16] & 0xF) != 1) {
374 pr_warning("%s: Problem switching card "
375 "into high-speed mode!\n",
376 mmc_hostname(card->host));
388 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
390 int host_drv_type = SD_DRIVER_TYPE_B;
391 int card_drv_type = SD_DRIVER_TYPE_B;
396 * If the host doesn't support any of the Driver Types A,C or D,
397 * or there is no board specific handler then default Driver
400 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
401 | MMC_CAP_DRIVER_TYPE_D)))
404 if (!card->host->ops->select_drive_strength)
407 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
408 host_drv_type |= SD_DRIVER_TYPE_A;
410 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
411 host_drv_type |= SD_DRIVER_TYPE_C;
413 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
414 host_drv_type |= SD_DRIVER_TYPE_D;
416 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
417 card_drv_type |= SD_DRIVER_TYPE_A;
419 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
420 card_drv_type |= SD_DRIVER_TYPE_C;
422 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
423 card_drv_type |= SD_DRIVER_TYPE_D;
426 * The drive strength that the hardware can support
427 * depends on the board design. Pass the appropriate
428 * information and let the hardware specific code
429 * return what is possible given the options
431 mmc_host_clk_hold(card->host);
432 drive_strength = card->host->ops->select_drive_strength(
433 card->sw_caps.uhs_max_dtr,
434 host_drv_type, card_drv_type);
435 mmc_host_clk_release(card->host);
437 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
441 if ((status[15] & 0xF) != drive_strength) {
442 pr_warning("%s: Problem setting drive strength!\n",
443 mmc_hostname(card->host));
447 mmc_set_driver_type(card->host, drive_strength);
452 static void sd_update_bus_speed_mode(struct mmc_card *card)
455 * If the host doesn't support any of the UHS-I modes, fallback on
458 if (!mmc_host_uhs(card->host)) {
459 card->sd_bus_speed = 0;
463 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
464 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
465 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
466 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
467 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
468 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
469 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
470 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
471 SD_MODE_UHS_SDR50)) {
472 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
473 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
474 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
475 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
476 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
477 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
478 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
479 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
480 SD_MODE_UHS_SDR12)) {
481 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
485 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
488 unsigned int timing = 0;
490 switch (card->sd_bus_speed) {
491 case UHS_SDR104_BUS_SPEED:
492 timing = MMC_TIMING_UHS_SDR104;
493 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
495 case UHS_DDR50_BUS_SPEED:
496 timing = MMC_TIMING_UHS_DDR50;
497 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
499 case UHS_SDR50_BUS_SPEED:
500 timing = MMC_TIMING_UHS_SDR50;
501 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
503 case UHS_SDR25_BUS_SPEED:
504 timing = MMC_TIMING_UHS_SDR25;
505 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
507 case UHS_SDR12_BUS_SPEED:
508 timing = MMC_TIMING_UHS_SDR12;
509 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
515 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
519 if ((status[16] & 0xF) != card->sd_bus_speed)
520 pr_warning("%s: Problem setting bus speed mode!\n",
521 mmc_hostname(card->host));
523 mmc_set_timing(card->host, timing);
524 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
530 /* Get host's max current setting at its current voltage */
531 static u32 sd_get_host_max_current(struct mmc_host *host)
533 u32 voltage, max_current;
535 voltage = 1 << host->ios.vdd;
537 case MMC_VDD_165_195:
538 max_current = host->max_current_180;
542 max_current = host->max_current_300;
546 max_current = host->max_current_330;
555 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
557 int current_limit = SD_SET_CURRENT_NO_CHANGE;
562 * Current limit switch is only defined for SDR50, SDR104, and DDR50
563 * bus speed modes. For other bus speed modes, we do not change the
566 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
567 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
568 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
572 * Host has different current capabilities when operating at
573 * different voltages, so find out its max current first.
575 max_current = sd_get_host_max_current(card->host);
578 * We only check host's capability here, if we set a limit that is
579 * higher than the card's maximum current, the card will be using its
580 * maximum current, e.g. if the card's maximum current is 300ma, and
581 * when we set current limit to 200ma, the card will draw 200ma, and
582 * when we set current limit to 400/600/800ma, the card will draw its
583 * maximum 300ma from the host.
585 if (max_current >= 800)
586 current_limit = SD_SET_CURRENT_LIMIT_800;
587 else if (max_current >= 600)
588 current_limit = SD_SET_CURRENT_LIMIT_600;
589 else if (max_current >= 400)
590 current_limit = SD_SET_CURRENT_LIMIT_400;
591 else if (max_current >= 200)
592 current_limit = SD_SET_CURRENT_LIMIT_200;
594 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
595 err = mmc_sd_switch(card, 1, 3, current_limit, status);
599 if (((status[15] >> 4) & 0x0F) != current_limit)
600 pr_warning("%s: Problem setting current limit!\n",
601 mmc_hostname(card->host));
609 * UHS-I specific initialization procedure
611 static int mmc_sd_init_uhs_card(struct mmc_card *card)
616 if (!card->scr.sda_spec3)
619 if (!(card->csd.cmdclass & CCC_SWITCH))
622 status = kmalloc(64, GFP_KERNEL);
624 pr_err("%s: could not allocate a buffer for "
625 "switch capabilities.\n", mmc_hostname(card->host));
629 /* Set 4-bit bus width */
630 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
631 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
632 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
636 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
640 * Select the bus speed mode depending on host
641 * and card capability.
643 sd_update_bus_speed_mode(card);
645 /* Set the driver strength for the card */
646 err = sd_select_driver_type(card, status);
650 /* Set current limit for the card */
651 err = sd_set_current_limit(card, status);
655 /* Set bus speed mode of the card */
656 err = sd_set_bus_speed_mode(card, status);
661 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
662 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
664 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning &&
665 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED ||
666 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) {
667 mmc_host_clk_hold(card->host);
668 err = card->host->ops->execute_tuning(card->host,
669 MMC_SEND_TUNING_BLOCK);
670 mmc_host_clk_release(card->host);
679 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
680 card->raw_cid[2], card->raw_cid[3]);
681 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
682 card->raw_csd[2], card->raw_csd[3]);
683 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
684 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
685 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
686 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
687 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
688 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
689 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
690 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
691 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
692 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
695 static struct attribute *sd_std_attrs[] = {
700 &dev_attr_erase_size.attr,
701 &dev_attr_preferred_erase_size.attr,
702 &dev_attr_fwrev.attr,
703 &dev_attr_hwrev.attr,
704 &dev_attr_manfid.attr,
706 &dev_attr_oemid.attr,
707 &dev_attr_serial.attr,
710 ATTRIBUTE_GROUPS(sd_std);
712 struct device_type sd_type = {
713 .groups = sd_std_groups,
717 * Fetch CID from card.
719 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
729 pr_warning("%s: Skipping voltage switch\n",
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 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
821 * Fetch SCR from card.
823 err = mmc_app_send_scr(card, card->raw_scr);
827 err = mmc_decode_scr(card);
832 * Fetch and process SD Status register.
834 err = mmc_read_ssr(card);
838 /* Erase init depends on CSD and SSR */
839 mmc_init_erase(card);
842 * Fetch switch information from card.
844 err = mmc_read_switch(card);
850 * For SPI, enable CRC as appropriate.
851 * This CRC enable is located AFTER the reading of the
852 * card registers because some SDHC cards are not able
853 * to provide valid CRCs for non-512-byte blocks.
855 if (mmc_host_is_spi(host)) {
856 err = mmc_spi_set_crc(host, use_spi_crc);
862 * Check if read-only switch is active.
867 if (host->ops->get_ro) {
868 mmc_host_clk_hold(card->host);
869 ro = host->ops->get_ro(host);
870 mmc_host_clk_release(card->host);
874 pr_warning("%s: host does not "
875 "support reading read-only "
876 "switch. assuming write-enable.\n",
879 mmc_card_set_readonly(card);
886 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
888 unsigned max_dtr = (unsigned int)-1;
890 if (mmc_card_hs(card)) {
891 if (max_dtr > card->sw_caps.hs_max_dtr)
892 max_dtr = card->sw_caps.hs_max_dtr;
893 } else if (max_dtr > card->csd.max_dtr) {
894 max_dtr = card->csd.max_dtr;
901 * Handle the detection and initialisation of a card.
903 * In the case of a resume, "oldcard" will contain the card
904 * we're trying to reinitialise.
906 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
907 struct mmc_card *oldcard)
909 struct mmc_card *card;
915 WARN_ON(!host->claimed);
917 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
922 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
928 * Allocate card structure.
930 card = mmc_alloc_card(host, &sd_type);
932 return PTR_ERR(card);
935 card->type = MMC_TYPE_SD;
936 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
940 * For native busses: get card RCA and quit open drain mode.
942 if (!mmc_host_is_spi(host)) {
943 err = mmc_send_relative_addr(host, &card->rca);
949 err = mmc_sd_get_csd(host, card);
953 mmc_decode_cid(card);
957 * Select card, as all following commands rely on that.
959 if (!mmc_host_is_spi(host)) {
960 err = mmc_select_card(card);
965 err = mmc_sd_setup_card(host, card, oldcard != NULL);
969 /* Initialization sequence for UHS-I cards */
970 if (rocr & SD_ROCR_S18A) {
971 err = mmc_sd_init_uhs_card(card);
976 * Attempt to change to high-speed (if supported)
978 err = mmc_sd_switch_hs(card);
980 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
987 mmc_set_clock(host, mmc_sd_get_max_clock(card));
990 * Switch to wider bus (if supported).
992 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
993 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
994 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
998 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1007 mmc_remove_card(card);
1013 * Host is being removed. Free up the current card.
1015 static void mmc_sd_remove(struct mmc_host *host)
1018 BUG_ON(!host->card);
1020 mmc_remove_card(host->card);
1025 * Card detection - card is alive.
1027 static int mmc_sd_alive(struct mmc_host *host)
1029 return mmc_send_status(host->card, NULL);
1033 * Card detection callback from host.
1035 static void mmc_sd_detect(struct mmc_host *host)
1040 BUG_ON(!host->card);
1042 mmc_get_card(host->card);
1045 * Just check if our card has been removed.
1047 err = _mmc_detect_card_removed(host);
1049 mmc_put_card(host->card);
1052 mmc_sd_remove(host);
1054 mmc_claim_host(host);
1055 mmc_detach_bus(host);
1056 mmc_power_off(host);
1057 mmc_release_host(host);
1061 static int _mmc_sd_suspend(struct mmc_host *host)
1066 BUG_ON(!host->card);
1068 mmc_claim_host(host);
1070 if (mmc_card_suspended(host->card))
1073 if (!mmc_host_is_spi(host))
1074 err = mmc_deselect_cards(host);
1077 mmc_power_off(host);
1078 mmc_card_set_suspended(host->card);
1082 mmc_release_host(host);
1087 * Callback for suspend
1089 static int mmc_sd_suspend(struct mmc_host *host)
1093 err = _mmc_sd_suspend(host);
1095 pm_runtime_disable(&host->card->dev);
1096 pm_runtime_set_suspended(&host->card->dev);
1103 * This function tries to determine if the same card is still present
1104 * and, if so, restore all state to it.
1106 static int _mmc_sd_resume(struct mmc_host *host)
1111 BUG_ON(!host->card);
1113 mmc_claim_host(host);
1115 if (!mmc_card_suspended(host->card))
1118 mmc_power_up(host, host->card->ocr);
1119 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1120 mmc_card_clr_suspended(host->card);
1123 mmc_release_host(host);
1128 * Callback for resume
1130 static int mmc_sd_resume(struct mmc_host *host)
1134 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1135 err = _mmc_sd_resume(host);
1136 pm_runtime_set_active(&host->card->dev);
1137 pm_runtime_mark_last_busy(&host->card->dev);
1139 pm_runtime_enable(&host->card->dev);
1145 * Callback for runtime_suspend.
1147 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1151 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1154 err = _mmc_sd_suspend(host);
1156 pr_err("%s: error %d doing aggessive suspend\n",
1157 mmc_hostname(host), err);
1163 * Callback for runtime_resume.
1165 static int mmc_sd_runtime_resume(struct mmc_host *host)
1169 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1172 err = _mmc_sd_resume(host);
1174 pr_err("%s: error %d doing aggessive resume\n",
1175 mmc_hostname(host), err);
1180 static int mmc_sd_power_restore(struct mmc_host *host)
1184 mmc_claim_host(host);
1185 ret = mmc_sd_init_card(host, host->card->ocr, host->card);
1186 mmc_release_host(host);
1191 static const struct mmc_bus_ops mmc_sd_ops = {
1192 .remove = mmc_sd_remove,
1193 .detect = mmc_sd_detect,
1194 .runtime_suspend = mmc_sd_runtime_suspend,
1195 .runtime_resume = mmc_sd_runtime_resume,
1196 .suspend = mmc_sd_suspend,
1197 .resume = mmc_sd_resume,
1198 .power_restore = mmc_sd_power_restore,
1199 .alive = mmc_sd_alive,
1200 .shutdown = mmc_sd_suspend,
1204 * Starting point for SD card init.
1206 int mmc_attach_sd(struct mmc_host *host)
1212 WARN_ON(!host->claimed);
1214 err = mmc_send_app_op_cond(host, 0, &ocr);
1218 mmc_attach_bus(host, &mmc_sd_ops);
1219 if (host->ocr_avail_sd)
1220 host->ocr_avail = host->ocr_avail_sd;
1223 * We need to get OCR a different way for SPI.
1225 if (mmc_host_is_spi(host)) {
1228 err = mmc_spi_read_ocr(host, 0, &ocr);
1233 rocr = mmc_select_voltage(host, ocr);
1236 * Can we support the voltage(s) of the card(s)?
1244 * Detect and init the card.
1246 err = mmc_sd_init_card(host, rocr, NULL);
1250 mmc_release_host(host);
1251 err = mmc_add_card(host->card);
1252 mmc_claim_host(host);
1259 mmc_release_host(host);
1260 mmc_remove_card(host->card);
1262 mmc_claim_host(host);
1264 mmc_detach_bus(host);
1266 pr_err("%s: error %d whilst initialising SD card\n",
1267 mmc_hostname(host), err);