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/slab.h>
15 #include <linux/stat.h>
17 #include <linux/mmc/host.h>
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/mmc.h>
20 #include <linux/mmc/sd.h>
28 static const unsigned int tran_exp[] = {
29 10000, 100000, 1000000, 10000000,
33 static const unsigned char tran_mant[] = {
34 0, 10, 12, 13, 15, 20, 25, 30,
35 35, 40, 45, 50, 55, 60, 70, 80,
38 static const unsigned int tacc_exp[] = {
39 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
42 static const unsigned int tacc_mant[] = {
43 0, 10, 12, 13, 15, 20, 25, 30,
44 35, 40, 45, 50, 55, 60, 70, 80,
47 #define UNSTUFF_BITS(resp,start,size) \
49 const int __size = size; \
50 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
51 const int __off = 3 - ((start) / 32); \
52 const int __shft = (start) & 31; \
55 __res = resp[__off] >> __shft; \
56 if (__size + __shft > 32) \
57 __res |= resp[__off-1] << ((32 - __shft) % 32); \
62 * Given the decoded CSD structure, decode the raw CID to our CID structure.
64 void mmc_decode_cid(struct mmc_card *card)
66 u32 *resp = card->raw_cid;
68 memset(&card->cid, 0, sizeof(struct mmc_cid));
71 * SD doesn't currently have a version field so we will
72 * have to assume we can parse this.
74 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
75 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
76 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
77 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
78 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
79 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
80 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
81 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
82 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
83 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
84 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
85 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
87 card->cid.year += 2000; /* SD cards year offset */
91 * Given a 128-bit response, decode to our card CSD structure.
93 static int mmc_decode_csd(struct mmc_card *card)
95 struct mmc_csd *csd = &card->csd;
96 unsigned int e, m, csd_struct;
97 u32 *resp = card->raw_csd;
99 csd_struct = UNSTUFF_BITS(resp, 126, 2);
101 switch (csd_struct) {
103 m = UNSTUFF_BITS(resp, 115, 4);
104 e = UNSTUFF_BITS(resp, 112, 3);
105 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
106 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
108 m = UNSTUFF_BITS(resp, 99, 4);
109 e = UNSTUFF_BITS(resp, 96, 3);
110 csd->max_dtr = tran_exp[e] * tran_mant[m];
111 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
113 e = UNSTUFF_BITS(resp, 47, 3);
114 m = UNSTUFF_BITS(resp, 62, 12);
115 csd->capacity = (1 + m) << (e + 2);
117 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
118 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
119 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
120 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
121 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
122 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
123 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
125 if (UNSTUFF_BITS(resp, 46, 1)) {
127 } else if (csd->write_blkbits >= 9) {
128 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
129 csd->erase_size <<= csd->write_blkbits - 9;
134 * This is a block-addressed SDHC or SDXC card. Most
135 * interesting fields are unused and have fixed
136 * values. To avoid getting tripped by buggy cards,
137 * we assume those fixed values ourselves.
139 mmc_card_set_blockaddr(card);
141 csd->tacc_ns = 0; /* Unused */
142 csd->tacc_clks = 0; /* Unused */
144 m = UNSTUFF_BITS(resp, 99, 4);
145 e = UNSTUFF_BITS(resp, 96, 3);
146 csd->max_dtr = tran_exp[e] * tran_mant[m];
147 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
148 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
150 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
151 if (csd->c_size >= 0xFFFF)
152 mmc_card_set_ext_capacity(card);
154 m = UNSTUFF_BITS(resp, 48, 22);
155 csd->capacity = (1 + m) << 10;
157 csd->read_blkbits = 9;
158 csd->read_partial = 0;
159 csd->write_misalign = 0;
160 csd->read_misalign = 0;
161 csd->r2w_factor = 4; /* Unused */
162 csd->write_blkbits = 9;
163 csd->write_partial = 0;
167 pr_err("%s: unrecognised CSD structure version %d\n",
168 mmc_hostname(card->host), csd_struct);
172 card->erase_size = csd->erase_size;
178 * Given a 64-bit response, decode to our card SCR structure.
180 static int mmc_decode_scr(struct mmc_card *card)
182 struct sd_scr *scr = &card->scr;
183 unsigned int scr_struct;
186 resp[3] = card->raw_scr[1];
187 resp[2] = card->raw_scr[0];
189 scr_struct = UNSTUFF_BITS(resp, 60, 4);
190 if (scr_struct != 0) {
191 pr_err("%s: unrecognised SCR structure version %d\n",
192 mmc_hostname(card->host), scr_struct);
196 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
197 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
198 if (scr->sda_vsn == SCR_SPEC_VER_2)
199 /* Check if Physical Layer Spec v3.0 is supported */
200 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
202 if (UNSTUFF_BITS(resp, 55, 1))
203 card->erased_byte = 0xFF;
205 card->erased_byte = 0x0;
208 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
213 * Fetch and process SD Status register.
215 static int mmc_read_ssr(struct mmc_card *card)
217 unsigned int au, es, et, eo;
221 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
222 pr_warning("%s: card lacks mandatory SD Status "
223 "function.\n", mmc_hostname(card->host));
227 ssr = kmalloc(64, GFP_KERNEL);
231 err = mmc_app_sd_status(card, ssr);
233 pr_warning("%s: problem reading SD Status "
234 "register.\n", mmc_hostname(card->host));
239 for (i = 0; i < 16; i++)
240 ssr[i] = be32_to_cpu(ssr[i]);
243 * UNSTUFF_BITS only works with four u32s so we have to offset the
244 * bitfield positions accordingly.
246 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
247 if (au > 0 || au <= 9) {
248 card->ssr.au = 1 << (au + 4);
249 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
250 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
251 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
253 card->ssr.erase_timeout = (et * 1000) / es;
254 card->ssr.erase_offset = eo * 1000;
257 pr_warning("%s: SD Status: Invalid Allocation Unit "
258 "size.\n", mmc_hostname(card->host));
266 * Fetches and decodes switch information
268 static int mmc_read_switch(struct mmc_card *card)
273 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
276 if (!(card->csd.cmdclass & CCC_SWITCH)) {
277 pr_warning("%s: card lacks mandatory switch "
278 "function, performance might suffer.\n",
279 mmc_hostname(card->host));
285 status = kmalloc(64, GFP_KERNEL);
287 pr_err("%s: could not allocate a buffer for "
288 "switch capabilities.\n",
289 mmc_hostname(card->host));
293 /* Find out the supported Bus Speed Modes. */
294 err = mmc_sd_switch(card, 0, 0, 1, status);
297 * If the host or the card can't do the switch,
298 * fail more gracefully.
300 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
303 pr_warning("%s: problem reading Bus Speed modes.\n",
304 mmc_hostname(card->host));
310 if (status[13] & SD_MODE_HIGH_SPEED)
311 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
313 if (card->scr.sda_spec3) {
314 card->sw_caps.sd3_bus_mode = status[13];
316 /* Find out Driver Strengths supported by the card */
317 err = mmc_sd_switch(card, 0, 2, 1, status);
320 * If the host or the card can't do the switch,
321 * fail more gracefully.
323 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
326 pr_warning("%s: problem reading "
327 "Driver Strength.\n",
328 mmc_hostname(card->host));
334 card->sw_caps.sd3_drv_type = status[9];
336 /* Find out Current Limits supported by the card */
337 err = mmc_sd_switch(card, 0, 3, 1, status);
340 * If the host or the card can't do the switch,
341 * fail more gracefully.
343 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
346 pr_warning("%s: problem reading "
348 mmc_hostname(card->host));
354 card->sw_caps.sd3_curr_limit = status[7];
364 * Test if the card supports high-speed mode and, if so, switch to it.
366 int mmc_sd_switch_hs(struct mmc_card *card)
371 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
374 if (!(card->csd.cmdclass & CCC_SWITCH))
377 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
380 if (card->sw_caps.hs_max_dtr == 0)
385 status = kmalloc(64, GFP_KERNEL);
387 pr_err("%s: could not allocate a buffer for "
388 "switch capabilities.\n", mmc_hostname(card->host));
392 err = mmc_sd_switch(card, 1, 0, 1, status);
396 if ((status[16] & 0xF) != 1) {
397 pr_warning("%s: Problem switching card "
398 "into high-speed mode!\n",
399 mmc_hostname(card->host));
411 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
413 int host_drv_type = SD_DRIVER_TYPE_B;
414 int card_drv_type = SD_DRIVER_TYPE_B;
419 * If the host doesn't support any of the Driver Types A,C or D,
420 * or there is no board specific handler then default Driver
423 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
424 | MMC_CAP_DRIVER_TYPE_D)))
427 if (!card->host->ops->select_drive_strength)
430 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
431 host_drv_type |= SD_DRIVER_TYPE_A;
433 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
434 host_drv_type |= SD_DRIVER_TYPE_C;
436 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
437 host_drv_type |= SD_DRIVER_TYPE_D;
439 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
440 card_drv_type |= SD_DRIVER_TYPE_A;
442 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
443 card_drv_type |= SD_DRIVER_TYPE_C;
445 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
446 card_drv_type |= SD_DRIVER_TYPE_D;
449 * The drive strength that the hardware can support
450 * depends on the board design. Pass the appropriate
451 * information and let the hardware specific code
452 * return what is possible given the options
454 mmc_host_clk_hold(card->host);
455 drive_strength = card->host->ops->select_drive_strength(
456 card->sw_caps.uhs_max_dtr,
457 host_drv_type, card_drv_type);
458 mmc_host_clk_release(card->host);
460 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
464 if ((status[15] & 0xF) != drive_strength) {
465 pr_warning("%s: Problem setting drive strength!\n",
466 mmc_hostname(card->host));
470 mmc_set_driver_type(card->host, drive_strength);
475 static void sd_update_bus_speed_mode(struct mmc_card *card)
478 * If the host doesn't support any of the UHS-I modes, fallback on
481 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
482 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) {
483 card->sd_bus_speed = 0;
487 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
488 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
489 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
490 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
491 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
492 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
493 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
494 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
495 SD_MODE_UHS_SDR50)) {
496 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
498 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
499 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
500 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
501 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
502 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
503 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
504 SD_MODE_UHS_SDR12)) {
505 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
509 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
512 unsigned int timing = 0;
514 switch (card->sd_bus_speed) {
515 case UHS_SDR104_BUS_SPEED:
516 timing = MMC_TIMING_UHS_SDR104;
517 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
519 case UHS_DDR50_BUS_SPEED:
520 timing = MMC_TIMING_UHS_DDR50;
521 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
523 case UHS_SDR50_BUS_SPEED:
524 timing = MMC_TIMING_UHS_SDR50;
525 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
527 case UHS_SDR25_BUS_SPEED:
528 timing = MMC_TIMING_UHS_SDR25;
529 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
531 case UHS_SDR12_BUS_SPEED:
532 timing = MMC_TIMING_UHS_SDR12;
533 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
539 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
543 if ((status[16] & 0xF) != card->sd_bus_speed)
544 pr_warning("%s: Problem setting bus speed mode!\n",
545 mmc_hostname(card->host));
547 mmc_set_timing(card->host, timing);
548 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
554 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
556 int current_limit = 0;
560 * Current limit switch is only defined for SDR50, SDR104, and DDR50
561 * bus speed modes. For other bus speed modes, we set the default
562 * current limit of 200mA.
564 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
565 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
566 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) {
567 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
568 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
569 current_limit = SD_SET_CURRENT_LIMIT_800;
570 else if (card->sw_caps.sd3_curr_limit &
572 current_limit = SD_SET_CURRENT_LIMIT_600;
573 else if (card->sw_caps.sd3_curr_limit &
575 current_limit = SD_SET_CURRENT_LIMIT_400;
576 else if (card->sw_caps.sd3_curr_limit &
578 current_limit = SD_SET_CURRENT_LIMIT_200;
579 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
580 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
581 current_limit = SD_SET_CURRENT_LIMIT_600;
582 else if (card->sw_caps.sd3_curr_limit &
584 current_limit = SD_SET_CURRENT_LIMIT_400;
585 else if (card->sw_caps.sd3_curr_limit &
587 current_limit = SD_SET_CURRENT_LIMIT_200;
588 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
589 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
590 current_limit = SD_SET_CURRENT_LIMIT_400;
591 else if (card->sw_caps.sd3_curr_limit &
593 current_limit = SD_SET_CURRENT_LIMIT_200;
594 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
595 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
596 current_limit = SD_SET_CURRENT_LIMIT_200;
599 current_limit = SD_SET_CURRENT_LIMIT_200;
601 err = mmc_sd_switch(card, 1, 3, current_limit, status);
605 if (((status[15] >> 4) & 0x0F) != current_limit)
606 pr_warning("%s: Problem setting current limit!\n",
607 mmc_hostname(card->host));
613 * UHS-I specific initialization procedure
615 static int mmc_sd_init_uhs_card(struct mmc_card *card)
620 if (!card->scr.sda_spec3)
623 if (!(card->csd.cmdclass & CCC_SWITCH))
626 status = kmalloc(64, GFP_KERNEL);
628 pr_err("%s: could not allocate a buffer for "
629 "switch capabilities.\n", mmc_hostname(card->host));
633 /* Set 4-bit bus width */
634 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
635 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
636 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
640 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
644 * Select the bus speed mode depending on host
645 * and card capability.
647 sd_update_bus_speed_mode(card);
649 /* Set the driver strength for the card */
650 err = sd_select_driver_type(card, status);
654 /* Set current limit for the card */
655 err = sd_set_current_limit(card, status);
659 /* Set bus speed mode of the card */
660 err = sd_set_bus_speed_mode(card, status);
664 /* SPI mode doesn't define CMD19 */
665 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) {
666 mmc_host_clk_hold(card->host);
667 err = card->host->ops->execute_tuning(card->host,
668 MMC_SEND_TUNING_BLOCK);
669 mmc_host_clk_release(card->host);
678 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
679 card->raw_cid[2], card->raw_cid[3]);
680 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
681 card->raw_csd[2], card->raw_csd[3]);
682 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
683 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
684 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
685 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
686 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
687 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
688 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
689 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
690 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
691 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
694 static struct attribute *sd_std_attrs[] = {
699 &dev_attr_erase_size.attr,
700 &dev_attr_preferred_erase_size.attr,
701 &dev_attr_fwrev.attr,
702 &dev_attr_hwrev.attr,
703 &dev_attr_manfid.attr,
705 &dev_attr_oemid.attr,
706 &dev_attr_serial.attr,
710 static struct attribute_group sd_std_attr_group = {
711 .attrs = sd_std_attrs,
714 static const struct attribute_group *sd_attr_groups[] = {
719 struct device_type sd_type = {
720 .groups = sd_attr_groups,
724 * Fetch CID from card.
726 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
731 * Since we're changing the OCR value, we seem to
732 * need to tell some cards to go back to the idle
733 * state. We wait 1ms to give cards time to
739 * If SD_SEND_IF_COND indicates an SD 2.0
740 * compliant card and we should set bit 30
741 * of the ocr to indicate that we can handle
742 * block-addressed SDHC cards.
744 err = mmc_send_if_cond(host, ocr);
749 * If the host supports one of UHS-I modes, request the card
750 * to switch to 1.8V signaling level.
752 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
753 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
756 /* If the host can supply more than 150mA, XPC should be set to 1. */
757 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 |
758 MMC_CAP_SET_XPC_180))
762 err = mmc_send_app_op_cond(host, ocr, rocr);
767 * In case CCS and S18A in the response is set, start Signal Voltage
768 * Switch procedure. SPI mode doesn't support CMD11.
770 if (!mmc_host_is_spi(host) && rocr &&
771 ((*rocr & 0x41000000) == 0x41000000)) {
772 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
779 if (mmc_host_is_spi(host))
780 err = mmc_send_cid(host, cid);
782 err = mmc_all_send_cid(host, cid);
787 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
792 * Fetch CSD from card.
794 err = mmc_send_csd(card, card->raw_csd);
798 err = mmc_decode_csd(card);
805 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
812 * Fetch SCR from card.
814 err = mmc_app_send_scr(card, card->raw_scr);
818 err = mmc_decode_scr(card);
823 * Fetch and process SD Status register.
825 err = mmc_read_ssr(card);
829 /* Erase init depends on CSD and SSR */
830 mmc_init_erase(card);
833 * Fetch switch information from card.
835 err = mmc_read_switch(card);
841 * For SPI, enable CRC as appropriate.
842 * This CRC enable is located AFTER the reading of the
843 * card registers because some SDHC cards are not able
844 * to provide valid CRCs for non-512-byte blocks.
846 if (mmc_host_is_spi(host)) {
847 err = mmc_spi_set_crc(host, use_spi_crc);
853 * Check if read-only switch is active.
858 if (host->ops->get_ro) {
859 mmc_host_clk_hold(card->host);
860 ro = host->ops->get_ro(host);
861 mmc_host_clk_release(card->host);
865 pr_warning("%s: host does not "
866 "support reading read-only "
867 "switch. assuming write-enable.\n",
870 mmc_card_set_readonly(card);
877 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
879 unsigned max_dtr = (unsigned int)-1;
881 if (mmc_card_highspeed(card)) {
882 if (max_dtr > card->sw_caps.hs_max_dtr)
883 max_dtr = card->sw_caps.hs_max_dtr;
884 } else if (max_dtr > card->csd.max_dtr) {
885 max_dtr = card->csd.max_dtr;
891 void mmc_sd_go_highspeed(struct mmc_card *card)
893 mmc_card_set_highspeed(card);
894 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
898 * Handle the detection and initialisation of a card.
900 * In the case of a resume, "oldcard" will contain the card
901 * we're trying to reinitialise.
903 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
904 struct mmc_card *oldcard)
906 struct mmc_card *card;
912 WARN_ON(!host->claimed);
914 /* The initialization should be done at 3.3 V I/O voltage. */
915 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
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);
934 card->type = MMC_TYPE_SD;
935 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
939 * For native busses: get card RCA and quit open drain mode.
941 if (!mmc_host_is_spi(host)) {
942 err = mmc_send_relative_addr(host, &card->rca);
948 err = mmc_sd_get_csd(host, card);
952 mmc_decode_cid(card);
956 * Select card, as all following commands rely on that.
958 if (!mmc_host_is_spi(host)) {
959 err = mmc_select_card(card);
964 err = mmc_sd_setup_card(host, card, oldcard != NULL);
968 /* Initialization sequence for UHS-I cards */
969 if (rocr & SD_ROCR_S18A) {
970 err = mmc_sd_init_uhs_card(card);
974 /* Card is an ultra-high-speed card */
975 mmc_card_set_uhs(card);
978 * Since initialization is now complete, enable preset
979 * value registers for UHS-I cards.
981 if (host->ops->enable_preset_value) {
982 mmc_host_clk_hold(card->host);
983 host->ops->enable_preset_value(host, true);
984 mmc_host_clk_release(card->host);
988 * Attempt to change to high-speed (if supported)
990 err = mmc_sd_switch_hs(card);
992 mmc_sd_go_highspeed(card);
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_claim_host(host);
1057 * Just check if our card has been removed.
1059 err = _mmc_detect_card_removed(host);
1061 mmc_release_host(host);
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);
1074 * Suspend callback from host.
1076 static int mmc_sd_suspend(struct mmc_host *host)
1081 BUG_ON(!host->card);
1083 mmc_claim_host(host);
1084 if (!mmc_host_is_spi(host))
1085 err = mmc_deselect_cards(host);
1086 host->card->state &= ~MMC_STATE_HIGHSPEED;
1087 mmc_release_host(host);
1093 * Resume callback from host.
1095 * This function tries to determine if the same card is still present
1096 * and, if so, restore all state to it.
1098 static int mmc_sd_resume(struct mmc_host *host)
1103 BUG_ON(!host->card);
1105 mmc_claim_host(host);
1106 err = mmc_sd_init_card(host, host->ocr, host->card);
1107 mmc_release_host(host);
1112 static int mmc_sd_power_restore(struct mmc_host *host)
1116 host->card->state &= ~MMC_STATE_HIGHSPEED;
1117 mmc_claim_host(host);
1118 ret = mmc_sd_init_card(host, host->ocr, host->card);
1119 mmc_release_host(host);
1124 static const struct mmc_bus_ops mmc_sd_ops = {
1125 .remove = mmc_sd_remove,
1126 .detect = mmc_sd_detect,
1129 .power_restore = mmc_sd_power_restore,
1130 .alive = mmc_sd_alive,
1133 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1134 .remove = mmc_sd_remove,
1135 .detect = mmc_sd_detect,
1136 .suspend = mmc_sd_suspend,
1137 .resume = mmc_sd_resume,
1138 .power_restore = mmc_sd_power_restore,
1139 .alive = mmc_sd_alive,
1142 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1144 const struct mmc_bus_ops *bus_ops;
1146 if (!mmc_card_is_removable(host))
1147 bus_ops = &mmc_sd_ops_unsafe;
1149 bus_ops = &mmc_sd_ops;
1150 mmc_attach_bus(host, bus_ops);
1154 * Starting point for SD card init.
1156 int mmc_attach_sd(struct mmc_host *host)
1162 WARN_ON(!host->claimed);
1164 /* Disable preset value enable if already set since last time */
1165 if (host->ops->enable_preset_value) {
1166 mmc_host_clk_hold(host);
1167 host->ops->enable_preset_value(host, false);
1168 mmc_host_clk_release(host);
1171 err = mmc_send_app_op_cond(host, 0, &ocr);
1175 mmc_sd_attach_bus_ops(host);
1176 if (host->ocr_avail_sd)
1177 host->ocr_avail = host->ocr_avail_sd;
1180 * We need to get OCR a different way for SPI.
1182 if (mmc_host_is_spi(host)) {
1185 err = mmc_spi_read_ocr(host, 0, &ocr);
1191 * Sanity check the voltages that the card claims to
1195 pr_warning("%s: card claims to support voltages "
1196 "below the defined range. These will be ignored.\n",
1197 mmc_hostname(host));
1201 if ((ocr & MMC_VDD_165_195) &&
1202 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1203 pr_warning("%s: SD card claims to support the "
1204 "incompletely defined 'low voltage range'. This "
1205 "will be ignored.\n", mmc_hostname(host));
1206 ocr &= ~MMC_VDD_165_195;
1209 host->ocr = mmc_select_voltage(host, ocr);
1212 * Can we support the voltage(s) of the card(s)?
1220 * Detect and init the card.
1222 err = mmc_sd_init_card(host, host->ocr, NULL);
1226 mmc_release_host(host);
1227 err = mmc_add_card(host->card);
1228 mmc_claim_host(host);
1235 mmc_release_host(host);
1236 mmc_remove_card(host->card);
1238 mmc_claim_host(host);
1240 mmc_detach_bus(host);
1242 pr_err("%s: error %d whilst initialising SD card\n",
1243 mmc_hostname(host), err);