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;
78 * SD doesn't currently have a version field so we will
79 * have to assume we can parse this.
81 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
82 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
83 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
84 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
85 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
86 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
87 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
88 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
89 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
90 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
91 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
92 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
94 card->cid.year += 2000; /* SD cards year offset */
98 * Given a 128-bit response, decode to our card CSD structure.
100 static int mmc_decode_csd(struct mmc_card *card)
102 struct mmc_csd *csd = &card->csd;
103 unsigned int e, m, csd_struct;
104 u32 *resp = card->raw_csd;
106 csd_struct = UNSTUFF_BITS(resp, 126, 2);
108 switch (csd_struct) {
110 m = UNSTUFF_BITS(resp, 115, 4);
111 e = UNSTUFF_BITS(resp, 112, 3);
112 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
113 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
115 m = UNSTUFF_BITS(resp, 99, 4);
116 e = UNSTUFF_BITS(resp, 96, 3);
117 csd->max_dtr = tran_exp[e] * tran_mant[m];
118 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
120 e = UNSTUFF_BITS(resp, 47, 3);
121 m = UNSTUFF_BITS(resp, 62, 12);
122 csd->capacity = (1 + m) << (e + 2);
124 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
125 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
126 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
127 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
128 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
129 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
130 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
131 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
133 if (UNSTUFF_BITS(resp, 46, 1)) {
135 } else if (csd->write_blkbits >= 9) {
136 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
137 csd->erase_size <<= csd->write_blkbits - 9;
142 * This is a block-addressed SDHC or SDXC card. Most
143 * interesting fields are unused and have fixed
144 * values. To avoid getting tripped by buggy cards,
145 * we assume those fixed values ourselves.
147 mmc_card_set_blockaddr(card);
149 csd->tacc_ns = 0; /* Unused */
150 csd->tacc_clks = 0; /* Unused */
152 m = UNSTUFF_BITS(resp, 99, 4);
153 e = UNSTUFF_BITS(resp, 96, 3);
154 csd->max_dtr = tran_exp[e] * tran_mant[m];
155 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
156 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
158 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
159 if (csd->c_size >= 0xFFFF)
160 mmc_card_set_ext_capacity(card);
162 m = UNSTUFF_BITS(resp, 48, 22);
163 csd->capacity = (1 + m) << 10;
165 csd->read_blkbits = 9;
166 csd->read_partial = 0;
167 csd->write_misalign = 0;
168 csd->read_misalign = 0;
169 csd->r2w_factor = 4; /* Unused */
170 csd->write_blkbits = 9;
171 csd->write_partial = 0;
175 pr_err("%s: unrecognised CSD structure version %d\n",
176 mmc_hostname(card->host), csd_struct);
180 card->erase_size = csd->erase_size;
186 * Given a 64-bit response, decode to our card SCR structure.
188 static int mmc_decode_scr(struct mmc_card *card)
190 struct sd_scr *scr = &card->scr;
191 unsigned int scr_struct;
194 resp[3] = card->raw_scr[1];
195 resp[2] = card->raw_scr[0];
197 scr_struct = UNSTUFF_BITS(resp, 60, 4);
198 if (scr_struct != 0) {
199 pr_err("%s: unrecognised SCR structure version %d\n",
200 mmc_hostname(card->host), scr_struct);
204 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
205 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
206 if (scr->sda_vsn == SCR_SPEC_VER_2)
207 /* Check if Physical Layer Spec v3.0 is supported */
208 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
210 if (UNSTUFF_BITS(resp, 55, 1))
211 card->erased_byte = 0xFF;
213 card->erased_byte = 0x0;
216 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
221 * Fetch and process SD Status register.
223 static int mmc_read_ssr(struct mmc_card *card)
225 unsigned int au, es, et, eo;
229 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
230 pr_warn("%s: card lacks mandatory SD Status function\n",
231 mmc_hostname(card->host));
235 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
239 if (mmc_app_sd_status(card, raw_ssr)) {
240 pr_warn("%s: problem reading SD Status register\n",
241 mmc_hostname(card->host));
246 for (i = 0; i < 16; i++)
247 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
252 * UNSTUFF_BITS only works with four u32s so we have to offset the
253 * bitfield positions accordingly.
255 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
257 if (au <= 9 || card->scr.sda_spec3) {
258 card->ssr.au = sd_au_size[au];
259 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
260 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
262 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
263 card->ssr.erase_timeout = (et * 1000) / es;
264 card->ssr.erase_offset = eo * 1000;
267 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
268 mmc_hostname(card->host));
276 * Fetches and decodes switch information
278 static int mmc_read_switch(struct mmc_card *card)
283 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
286 if (!(card->csd.cmdclass & CCC_SWITCH)) {
287 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
288 mmc_hostname(card->host));
294 status = kmalloc(64, GFP_KERNEL);
296 pr_err("%s: could not allocate a buffer for "
297 "switch capabilities.\n",
298 mmc_hostname(card->host));
303 * Find out the card's support bits with a mode 0 operation.
304 * The argument does not matter, as the support bits do not
305 * change with the arguments.
307 err = mmc_sd_switch(card, 0, 0, 0, status);
310 * If the host or the card can't do the switch,
311 * fail more gracefully.
313 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
316 pr_warn("%s: problem reading Bus Speed modes\n",
317 mmc_hostname(card->host));
323 if (status[13] & SD_MODE_HIGH_SPEED)
324 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
326 if (card->scr.sda_spec3) {
327 card->sw_caps.sd3_bus_mode = status[13];
328 /* Driver Strengths supported by the card */
329 card->sw_caps.sd3_drv_type = status[9];
330 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
340 * Test if the card supports high-speed mode and, if so, switch to it.
342 int mmc_sd_switch_hs(struct mmc_card *card)
347 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
350 if (!(card->csd.cmdclass & CCC_SWITCH))
353 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
356 if (card->sw_caps.hs_max_dtr == 0)
359 status = kmalloc(64, GFP_KERNEL);
361 pr_err("%s: could not allocate a buffer for "
362 "switch capabilities.\n", mmc_hostname(card->host));
366 err = mmc_sd_switch(card, 1, 0, 1, status);
370 if ((status[16] & 0xF) != 1) {
371 pr_warn("%s: Problem switching card into high-speed mode!\n",
372 mmc_hostname(card->host));
384 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
386 int card_drv_type, drive_strength, drv_type;
389 card->drive_strength = 0;
391 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
393 drive_strength = mmc_select_drive_strength(card,
394 card->sw_caps.uhs_max_dtr,
395 card_drv_type, &drv_type);
397 if (drive_strength) {
398 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
401 if ((status[15] & 0xF) != drive_strength) {
402 pr_warn("%s: Problem setting drive strength!\n",
403 mmc_hostname(card->host));
406 card->drive_strength = drive_strength;
410 mmc_set_driver_type(card->host, drv_type);
415 static void sd_update_bus_speed_mode(struct mmc_card *card)
418 * If the host doesn't support any of the UHS-I modes, fallback on
421 if (!mmc_host_uhs(card->host)) {
422 card->sd_bus_speed = 0;
426 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
427 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
428 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
429 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
430 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
431 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
432 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
433 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
434 SD_MODE_UHS_SDR50)) {
435 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
436 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
437 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
438 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
439 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
440 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
441 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
442 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
443 SD_MODE_UHS_SDR12)) {
444 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
448 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
451 unsigned int timing = 0;
453 switch (card->sd_bus_speed) {
454 case UHS_SDR104_BUS_SPEED:
455 timing = MMC_TIMING_UHS_SDR104;
456 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
458 case UHS_DDR50_BUS_SPEED:
459 timing = MMC_TIMING_UHS_DDR50;
460 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
462 case UHS_SDR50_BUS_SPEED:
463 timing = MMC_TIMING_UHS_SDR50;
464 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
466 case UHS_SDR25_BUS_SPEED:
467 timing = MMC_TIMING_UHS_SDR25;
468 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
470 case UHS_SDR12_BUS_SPEED:
471 timing = MMC_TIMING_UHS_SDR12;
472 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
478 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
482 if ((status[16] & 0xF) != card->sd_bus_speed)
483 pr_warn("%s: Problem setting bus speed mode!\n",
484 mmc_hostname(card->host));
486 mmc_set_timing(card->host, timing);
487 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
493 /* Get host's max current setting at its current voltage */
494 static u32 sd_get_host_max_current(struct mmc_host *host)
496 u32 voltage, max_current;
498 voltage = 1 << host->ios.vdd;
500 case MMC_VDD_165_195:
501 max_current = host->max_current_180;
505 max_current = host->max_current_300;
509 max_current = host->max_current_330;
518 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
520 int current_limit = SD_SET_CURRENT_NO_CHANGE;
525 * Current limit switch is only defined for SDR50, SDR104, and DDR50
526 * bus speed modes. For other bus speed modes, we do not change the
529 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
530 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
531 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
535 * Host has different current capabilities when operating at
536 * different voltages, so find out its max current first.
538 max_current = sd_get_host_max_current(card->host);
541 * We only check host's capability here, if we set a limit that is
542 * higher than the card's maximum current, the card will be using its
543 * maximum current, e.g. if the card's maximum current is 300ma, and
544 * when we set current limit to 200ma, the card will draw 200ma, and
545 * when we set current limit to 400/600/800ma, the card will draw its
546 * maximum 300ma from the host.
548 * The above is incorrect: if we try to set a current limit that is
549 * not supported by the card, the card can rightfully error out the
550 * attempt, and remain at the default current limit. This results
551 * in a 300mA card being limited to 200mA even though the host
552 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
553 * an iMX6 host. --rmk
555 if (max_current >= 800 &&
556 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
557 current_limit = SD_SET_CURRENT_LIMIT_800;
558 else if (max_current >= 600 &&
559 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
560 current_limit = SD_SET_CURRENT_LIMIT_600;
561 else if (max_current >= 400 &&
562 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
563 current_limit = SD_SET_CURRENT_LIMIT_400;
564 else if (max_current >= 200 &&
565 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
566 current_limit = SD_SET_CURRENT_LIMIT_200;
568 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
569 err = mmc_sd_switch(card, 1, 3, current_limit, status);
573 if (((status[15] >> 4) & 0x0F) != current_limit)
574 pr_warn("%s: Problem setting current limit!\n",
575 mmc_hostname(card->host));
583 * UHS-I specific initialization procedure
585 static int mmc_sd_init_uhs_card(struct mmc_card *card)
590 if (!card->scr.sda_spec3)
593 if (!(card->csd.cmdclass & CCC_SWITCH))
596 status = kmalloc(64, GFP_KERNEL);
598 pr_err("%s: could not allocate a buffer for "
599 "switch capabilities.\n", mmc_hostname(card->host));
603 /* Set 4-bit bus width */
604 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
605 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
606 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
610 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
614 * Select the bus speed mode depending on host
615 * and card capability.
617 sd_update_bus_speed_mode(card);
619 /* Set the driver strength for the card */
620 err = sd_select_driver_type(card, status);
624 /* Set current limit for the card */
625 err = sd_set_current_limit(card, status);
629 /* Set bus speed mode of the card */
630 err = sd_set_bus_speed_mode(card, status);
635 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
636 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
638 if (!mmc_host_is_spi(card->host) &&
639 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
640 card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
641 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
642 err = mmc_execute_tuning(card);
645 * As SD Specifications Part1 Physical Layer Specification
646 * Version 3.01 says, CMD19 tuning is available for unlocked
647 * cards in transfer state of 1.8V signaling mode. The small
648 * difference between v3.00 and 3.01 spec means that CMD19
649 * tuning is also available for DDR50 mode.
651 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
652 pr_warn("%s: ddr50 tuning failed\n",
653 mmc_hostname(card->host));
664 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
665 card->raw_cid[2], card->raw_cid[3]);
666 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
667 card->raw_csd[2], card->raw_csd[3]);
668 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
670 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
671 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
672 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
673 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
674 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
675 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
677 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
678 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
679 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
680 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
681 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
682 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
683 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
684 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
685 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
686 MMC_DEV_ATTR(ocr, "%08x\n", card->ocr);
689 static ssize_t mmc_dsr_show(struct device *dev,
690 struct device_attribute *attr,
693 struct mmc_card *card = mmc_dev_to_card(dev);
694 struct mmc_host *host = card->host;
696 if (card->csd.dsr_imp && host->dsr_req)
697 return sprintf(buf, "0x%x\n", host->dsr);
699 /* return default DSR value */
700 return sprintf(buf, "0x%x\n", 0x404);
703 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
705 static struct attribute *sd_std_attrs[] = {
711 &dev_attr_erase_size.attr,
712 &dev_attr_preferred_erase_size.attr,
713 &dev_attr_fwrev.attr,
714 &dev_attr_hwrev.attr,
715 &dev_attr_manfid.attr,
717 &dev_attr_oemid.attr,
718 &dev_attr_serial.attr,
723 ATTRIBUTE_GROUPS(sd_std);
725 struct device_type sd_type = {
726 .groups = sd_std_groups,
730 * Fetch CID from card.
732 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
742 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
746 * Since we're changing the OCR value, we seem to
747 * need to tell some cards to go back to the idle
748 * state. We wait 1ms to give cards time to
754 * If SD_SEND_IF_COND indicates an SD 2.0
755 * compliant card and we should set bit 30
756 * of the ocr to indicate that we can handle
757 * block-addressed SDHC cards.
759 err = mmc_send_if_cond(host, ocr);
764 * If the host supports one of UHS-I modes, request the card
765 * to switch to 1.8V signaling level. If the card has failed
766 * repeatedly to switch however, skip this.
768 if (retries && mmc_host_uhs(host))
772 * If the host can supply more than 150mA at current voltage,
773 * XPC should be set to 1.
775 max_current = sd_get_host_max_current(host);
776 if (max_current > 150)
779 err = mmc_send_app_op_cond(host, ocr, rocr);
784 * In case 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 static int mmc_sd_get_ro(struct mmc_host *host)
831 * Some systems don't feature a write-protect pin and don't need one.
832 * E.g. because they only have micro-SD card slot. For those systems
833 * assume that the SD card is always read-write.
835 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
838 if (!host->ops->get_ro)
841 ro = host->ops->get_ro(host);
846 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
853 * Fetch SCR from card.
855 err = mmc_app_send_scr(card, card->raw_scr);
859 err = mmc_decode_scr(card);
864 * Fetch and process SD Status register.
866 err = mmc_read_ssr(card);
870 /* Erase init depends on CSD and SSR */
871 mmc_init_erase(card);
874 * Fetch switch information from card.
876 err = mmc_read_switch(card);
882 * For SPI, enable CRC as appropriate.
883 * This CRC enable is located AFTER the reading of the
884 * card registers because some SDHC cards are not able
885 * to provide valid CRCs for non-512-byte blocks.
887 if (mmc_host_is_spi(host)) {
888 err = mmc_spi_set_crc(host, use_spi_crc);
894 * Check if read-only switch is active.
897 int ro = mmc_sd_get_ro(host);
900 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
903 mmc_card_set_readonly(card);
910 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
912 unsigned max_dtr = (unsigned int)-1;
914 if (mmc_card_hs(card)) {
915 if (max_dtr > card->sw_caps.hs_max_dtr)
916 max_dtr = card->sw_caps.hs_max_dtr;
917 } else if (max_dtr > card->csd.max_dtr) {
918 max_dtr = card->csd.max_dtr;
925 * Handle the detection and initialisation of a card.
927 * In the case of a resume, "oldcard" will contain the card
928 * we're trying to reinitialise.
930 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
931 struct mmc_card *oldcard)
933 struct mmc_card *card;
938 WARN_ON(!host->claimed);
940 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
945 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
951 * Allocate card structure.
953 card = mmc_alloc_card(host, &sd_type);
955 return PTR_ERR(card);
958 card->type = MMC_TYPE_SD;
959 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
963 * Call the optional HC's init_card function to handle quirks.
965 if (host->ops->init_card)
966 host->ops->init_card(host, card);
969 * For native busses: get card RCA and quit open drain mode.
971 if (!mmc_host_is_spi(host)) {
972 err = mmc_send_relative_addr(host, &card->rca);
978 err = mmc_sd_get_csd(host, card);
982 mmc_decode_cid(card);
986 * handling only for cards supporting DSR and hosts requesting
989 if (card->csd.dsr_imp && host->dsr_req)
993 * Select card, as all following commands rely on that.
995 if (!mmc_host_is_spi(host)) {
996 err = mmc_select_card(card);
1001 err = mmc_sd_setup_card(host, card, oldcard != NULL);
1005 /* Initialization sequence for UHS-I cards */
1006 if (rocr & SD_ROCR_S18A) {
1007 err = mmc_sd_init_uhs_card(card);
1012 * Attempt to change to high-speed (if supported)
1014 err = mmc_sd_switch_hs(card);
1016 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1023 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1026 * Switch to wider bus (if supported).
1028 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1029 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1030 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1034 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1043 mmc_remove_card(card);
1049 * Host is being removed. Free up the current card.
1051 static void mmc_sd_remove(struct mmc_host *host)
1053 mmc_remove_card(host->card);
1058 * Card detection - card is alive.
1060 static int mmc_sd_alive(struct mmc_host *host)
1062 return mmc_send_status(host->card, NULL);
1066 * Card detection callback from host.
1068 static void mmc_sd_detect(struct mmc_host *host)
1072 mmc_get_card(host->card);
1075 * Just check if our card has been removed.
1077 err = _mmc_detect_card_removed(host);
1079 mmc_put_card(host->card);
1082 mmc_sd_remove(host);
1084 mmc_claim_host(host);
1085 mmc_detach_bus(host);
1086 mmc_power_off(host);
1087 mmc_release_host(host);
1091 static int _mmc_sd_suspend(struct mmc_host *host)
1095 mmc_claim_host(host);
1097 if (mmc_card_suspended(host->card))
1100 if (!mmc_host_is_spi(host))
1101 err = mmc_deselect_cards(host);
1104 mmc_power_off(host);
1105 mmc_card_set_suspended(host->card);
1109 mmc_release_host(host);
1114 * Callback for suspend
1116 static int mmc_sd_suspend(struct mmc_host *host)
1120 err = _mmc_sd_suspend(host);
1122 pm_runtime_disable(&host->card->dev);
1123 pm_runtime_set_suspended(&host->card->dev);
1130 * This function tries to determine if the same card is still present
1131 * and, if so, restore all state to it.
1133 static int _mmc_sd_resume(struct mmc_host *host)
1137 mmc_claim_host(host);
1139 if (!mmc_card_suspended(host->card))
1142 mmc_power_up(host, host->card->ocr);
1143 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1144 mmc_card_clr_suspended(host->card);
1147 mmc_release_host(host);
1152 * Callback for resume
1154 static int mmc_sd_resume(struct mmc_host *host)
1156 pm_runtime_enable(&host->card->dev);
1161 * Callback for runtime_suspend.
1163 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1167 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1170 err = _mmc_sd_suspend(host);
1172 pr_err("%s: error %d doing aggressive suspend\n",
1173 mmc_hostname(host), err);
1179 * Callback for runtime_resume.
1181 static int mmc_sd_runtime_resume(struct mmc_host *host)
1185 err = _mmc_sd_resume(host);
1186 if (err && err != -ENOMEDIUM)
1187 pr_err("%s: error %d doing runtime resume\n",
1188 mmc_hostname(host), err);
1193 static int mmc_sd_reset(struct mmc_host *host)
1195 mmc_power_cycle(host, host->card->ocr);
1196 return mmc_sd_init_card(host, host->card->ocr, host->card);
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 .alive = mmc_sd_alive,
1207 .shutdown = mmc_sd_suspend,
1208 .reset = mmc_sd_reset,
1212 * Starting point for SD card init.
1214 int mmc_attach_sd(struct mmc_host *host)
1219 WARN_ON(!host->claimed);
1221 err = mmc_send_app_op_cond(host, 0, &ocr);
1225 mmc_attach_bus(host, &mmc_sd_ops);
1226 if (host->ocr_avail_sd)
1227 host->ocr_avail = host->ocr_avail_sd;
1230 * We need to get OCR a different way for SPI.
1232 if (mmc_host_is_spi(host)) {
1235 err = mmc_spi_read_ocr(host, 0, &ocr);
1240 rocr = mmc_select_voltage(host, ocr);
1243 * Can we support the voltage(s) of the card(s)?
1251 * Detect and init the card.
1253 err = mmc_sd_init_card(host, rocr, NULL);
1257 mmc_release_host(host);
1258 err = mmc_add_card(host->card);
1262 mmc_claim_host(host);
1266 mmc_remove_card(host->card);
1268 mmc_claim_host(host);
1270 mmc_detach_bus(host);
1272 pr_err("%s: error %d whilst initialising SD card\n",
1273 mmc_hostname(host), err);