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));
294 * Find out the card's support bits with a mode 0 operation.
295 * The argument does not matter, as the support bits do not
296 * change with the arguments.
298 err = mmc_sd_switch(card, 0, 0, 0, status);
301 * If the host or the card can't do the switch,
302 * fail more gracefully.
304 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
307 pr_warning("%s: problem reading Bus Speed modes.\n",
308 mmc_hostname(card->host));
314 if (status[13] & SD_MODE_HIGH_SPEED)
315 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
317 if (card->scr.sda_spec3) {
318 card->sw_caps.sd3_bus_mode = status[13];
319 /* Driver Strengths supported by the card */
320 card->sw_caps.sd3_drv_type = status[9];
330 * Test if the card supports high-speed mode and, if so, switch to it.
332 int mmc_sd_switch_hs(struct mmc_card *card)
337 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
340 if (!(card->csd.cmdclass & CCC_SWITCH))
343 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
346 if (card->sw_caps.hs_max_dtr == 0)
351 status = kmalloc(64, GFP_KERNEL);
353 pr_err("%s: could not allocate a buffer for "
354 "switch capabilities.\n", mmc_hostname(card->host));
358 err = mmc_sd_switch(card, 1, 0, 1, status);
362 if ((status[16] & 0xF) != 1) {
363 pr_warning("%s: Problem switching card "
364 "into high-speed mode!\n",
365 mmc_hostname(card->host));
377 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
379 int host_drv_type = SD_DRIVER_TYPE_B;
380 int card_drv_type = SD_DRIVER_TYPE_B;
385 * If the host doesn't support any of the Driver Types A,C or D,
386 * or there is no board specific handler then default Driver
389 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
390 | MMC_CAP_DRIVER_TYPE_D)))
393 if (!card->host->ops->select_drive_strength)
396 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
397 host_drv_type |= SD_DRIVER_TYPE_A;
399 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
400 host_drv_type |= SD_DRIVER_TYPE_C;
402 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
403 host_drv_type |= SD_DRIVER_TYPE_D;
405 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
406 card_drv_type |= SD_DRIVER_TYPE_A;
408 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
409 card_drv_type |= SD_DRIVER_TYPE_C;
411 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
412 card_drv_type |= SD_DRIVER_TYPE_D;
415 * The drive strength that the hardware can support
416 * depends on the board design. Pass the appropriate
417 * information and let the hardware specific code
418 * return what is possible given the options
420 mmc_host_clk_hold(card->host);
421 drive_strength = card->host->ops->select_drive_strength(
422 card->sw_caps.uhs_max_dtr,
423 host_drv_type, card_drv_type);
424 mmc_host_clk_release(card->host);
426 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
430 if ((status[15] & 0xF) != drive_strength) {
431 pr_warning("%s: Problem setting drive strength!\n",
432 mmc_hostname(card->host));
436 mmc_set_driver_type(card->host, drive_strength);
441 static void sd_update_bus_speed_mode(struct mmc_card *card)
444 * If the host doesn't support any of the UHS-I modes, fallback on
447 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
448 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) {
449 card->sd_bus_speed = 0;
453 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
454 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
455 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
456 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
457 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
458 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
459 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
460 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
461 SD_MODE_UHS_SDR50)) {
462 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
463 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
464 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
465 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
466 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
467 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
468 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
469 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
470 SD_MODE_UHS_SDR12)) {
471 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
475 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
478 unsigned int timing = 0;
480 switch (card->sd_bus_speed) {
481 case UHS_SDR104_BUS_SPEED:
482 timing = MMC_TIMING_UHS_SDR104;
483 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
485 case UHS_DDR50_BUS_SPEED:
486 timing = MMC_TIMING_UHS_DDR50;
487 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
489 case UHS_SDR50_BUS_SPEED:
490 timing = MMC_TIMING_UHS_SDR50;
491 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
493 case UHS_SDR25_BUS_SPEED:
494 timing = MMC_TIMING_UHS_SDR25;
495 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
497 case UHS_SDR12_BUS_SPEED:
498 timing = MMC_TIMING_UHS_SDR12;
499 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
505 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
509 if ((status[16] & 0xF) != card->sd_bus_speed)
510 pr_warning("%s: Problem setting bus speed mode!\n",
511 mmc_hostname(card->host));
513 mmc_set_timing(card->host, timing);
514 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
520 /* Get host's max current setting at its current voltage */
521 static u32 sd_get_host_max_current(struct mmc_host *host)
523 u32 voltage, max_current;
525 voltage = 1 << host->ios.vdd;
527 case MMC_VDD_165_195:
528 max_current = host->max_current_180;
532 max_current = host->max_current_300;
536 max_current = host->max_current_330;
545 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
547 int current_limit = SD_SET_CURRENT_NO_CHANGE;
552 * Current limit switch is only defined for SDR50, SDR104, and DDR50
553 * bus speed modes. For other bus speed modes, we do not change the
556 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
557 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
558 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
562 * Host has different current capabilities when operating at
563 * different voltages, so find out its max current first.
565 max_current = sd_get_host_max_current(card->host);
568 * We only check host's capability here, if we set a limit that is
569 * higher than the card's maximum current, the card will be using its
570 * maximum current, e.g. if the card's maximum current is 300ma, and
571 * when we set current limit to 200ma, the card will draw 200ma, and
572 * when we set current limit to 400/600/800ma, the card will draw its
573 * maximum 300ma from the host.
575 if (max_current >= 800)
576 current_limit = SD_SET_CURRENT_LIMIT_800;
577 else if (max_current >= 600)
578 current_limit = SD_SET_CURRENT_LIMIT_600;
579 else if (max_current >= 400)
580 current_limit = SD_SET_CURRENT_LIMIT_400;
581 else if (max_current >= 200)
582 current_limit = SD_SET_CURRENT_LIMIT_200;
584 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
585 err = mmc_sd_switch(card, 1, 3, current_limit, status);
589 if (((status[15] >> 4) & 0x0F) != current_limit)
590 pr_warning("%s: Problem setting current limit!\n",
591 mmc_hostname(card->host));
599 * UHS-I specific initialization procedure
601 static int mmc_sd_init_uhs_card(struct mmc_card *card)
606 if (!card->scr.sda_spec3)
609 if (!(card->csd.cmdclass & CCC_SWITCH))
612 status = kmalloc(64, GFP_KERNEL);
614 pr_err("%s: could not allocate a buffer for "
615 "switch capabilities.\n", mmc_hostname(card->host));
619 /* Set 4-bit bus width */
620 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
621 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
622 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
626 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
630 * Select the bus speed mode depending on host
631 * and card capability.
633 sd_update_bus_speed_mode(card);
635 /* Set the driver strength for the card */
636 err = sd_select_driver_type(card, status);
640 /* Set current limit for the card */
641 err = sd_set_current_limit(card, status);
645 /* Set bus speed mode of the card */
646 err = sd_set_bus_speed_mode(card, status);
650 /* SPI mode doesn't define CMD19 */
651 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) {
652 mmc_host_clk_hold(card->host);
653 err = card->host->ops->execute_tuning(card->host,
654 MMC_SEND_TUNING_BLOCK);
655 mmc_host_clk_release(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]);
669 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
670 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
671 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
672 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
673 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
674 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
675 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
676 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
677 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
680 static struct attribute *sd_std_attrs[] = {
685 &dev_attr_erase_size.attr,
686 &dev_attr_preferred_erase_size.attr,
687 &dev_attr_fwrev.attr,
688 &dev_attr_hwrev.attr,
689 &dev_attr_manfid.attr,
691 &dev_attr_oemid.attr,
692 &dev_attr_serial.attr,
696 static struct attribute_group sd_std_attr_group = {
697 .attrs = sd_std_attrs,
700 static const struct attribute_group *sd_attr_groups[] = {
705 struct device_type sd_type = {
706 .groups = sd_attr_groups,
710 * Fetch CID from card.
712 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
718 * Since we're changing the OCR value, we seem to
719 * need to tell some cards to go back to the idle
720 * state. We wait 1ms to give cards time to
726 * If SD_SEND_IF_COND indicates an SD 2.0
727 * compliant card and we should set bit 30
728 * of the ocr to indicate that we can handle
729 * block-addressed SDHC cards.
731 err = mmc_send_if_cond(host, ocr);
736 * If the host supports one of UHS-I modes, request the card
737 * to switch to 1.8V signaling level.
739 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
740 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
744 * If the host can supply more than 150mA at current voltage,
745 * XPC should be set to 1.
747 max_current = sd_get_host_max_current(host);
748 if (max_current > 150)
752 err = mmc_send_app_op_cond(host, ocr, rocr);
757 * In case CCS and S18A in the response is set, start Signal Voltage
758 * Switch procedure. SPI mode doesn't support CMD11.
760 if (!mmc_host_is_spi(host) && rocr &&
761 ((*rocr & 0x41000000) == 0x41000000)) {
762 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
769 if (mmc_host_is_spi(host))
770 err = mmc_send_cid(host, cid);
772 err = mmc_all_send_cid(host, cid);
777 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
782 * Fetch CSD from card.
784 err = mmc_send_csd(card, card->raw_csd);
788 err = mmc_decode_csd(card);
795 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
802 * Fetch SCR from card.
804 err = mmc_app_send_scr(card, card->raw_scr);
808 err = mmc_decode_scr(card);
813 * Fetch and process SD Status register.
815 err = mmc_read_ssr(card);
819 /* Erase init depends on CSD and SSR */
820 mmc_init_erase(card);
823 * Fetch switch information from card.
825 err = mmc_read_switch(card);
831 * For SPI, enable CRC as appropriate.
832 * This CRC enable is located AFTER the reading of the
833 * card registers because some SDHC cards are not able
834 * to provide valid CRCs for non-512-byte blocks.
836 if (mmc_host_is_spi(host)) {
837 err = mmc_spi_set_crc(host, use_spi_crc);
843 * Check if read-only switch is active.
848 if (host->ops->get_ro) {
849 mmc_host_clk_hold(card->host);
850 ro = host->ops->get_ro(host);
851 mmc_host_clk_release(card->host);
855 pr_warning("%s: host does not "
856 "support reading read-only "
857 "switch. assuming write-enable.\n",
860 mmc_card_set_readonly(card);
867 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
869 unsigned max_dtr = (unsigned int)-1;
871 if (mmc_card_highspeed(card)) {
872 if (max_dtr > card->sw_caps.hs_max_dtr)
873 max_dtr = card->sw_caps.hs_max_dtr;
874 } else if (max_dtr > card->csd.max_dtr) {
875 max_dtr = card->csd.max_dtr;
881 void mmc_sd_go_highspeed(struct mmc_card *card)
883 mmc_card_set_highspeed(card);
884 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
888 * Handle the detection and initialisation of a card.
890 * In the case of a resume, "oldcard" will contain the card
891 * we're trying to reinitialise.
893 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
894 struct mmc_card *oldcard)
896 struct mmc_card *card;
902 WARN_ON(!host->claimed);
904 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
909 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
915 * Allocate card structure.
917 card = mmc_alloc_card(host, &sd_type);
919 return PTR_ERR(card);
921 card->type = MMC_TYPE_SD;
922 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
926 * For native busses: get card RCA and quit open drain mode.
928 if (!mmc_host_is_spi(host)) {
929 err = mmc_send_relative_addr(host, &card->rca);
935 err = mmc_sd_get_csd(host, card);
939 mmc_decode_cid(card);
943 * Select card, as all following commands rely on that.
945 if (!mmc_host_is_spi(host)) {
946 err = mmc_select_card(card);
951 err = mmc_sd_setup_card(host, card, oldcard != NULL);
955 /* Initialization sequence for UHS-I cards */
956 if (rocr & SD_ROCR_S18A) {
957 err = mmc_sd_init_uhs_card(card);
961 /* Card is an ultra-high-speed card */
962 mmc_card_set_uhs(card);
965 * Since initialization is now complete, enable preset
966 * value registers for UHS-I cards.
968 if (host->ops->enable_preset_value) {
969 mmc_host_clk_hold(card->host);
970 host->ops->enable_preset_value(host, true);
971 mmc_host_clk_release(card->host);
975 * Attempt to change to high-speed (if supported)
977 err = mmc_sd_switch_hs(card);
979 mmc_sd_go_highspeed(card);
986 mmc_set_clock(host, mmc_sd_get_max_clock(card));
989 * Switch to wider bus (if supported).
991 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
992 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
993 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
997 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1006 mmc_remove_card(card);
1012 * Host is being removed. Free up the current card.
1014 static void mmc_sd_remove(struct mmc_host *host)
1017 BUG_ON(!host->card);
1019 mmc_remove_card(host->card);
1024 * Card detection - card is alive.
1026 static int mmc_sd_alive(struct mmc_host *host)
1028 return mmc_send_status(host->card, NULL);
1032 * Card detection callback from host.
1034 static void mmc_sd_detect(struct mmc_host *host)
1039 BUG_ON(!host->card);
1041 mmc_claim_host(host);
1044 * Just check if our card has been removed.
1046 err = _mmc_detect_card_removed(host);
1048 mmc_release_host(host);
1051 mmc_sd_remove(host);
1053 mmc_claim_host(host);
1054 mmc_detach_bus(host);
1055 mmc_power_off(host);
1056 mmc_release_host(host);
1061 * Suspend callback from host.
1063 static int mmc_sd_suspend(struct mmc_host *host)
1068 BUG_ON(!host->card);
1070 mmc_claim_host(host);
1071 if (!mmc_host_is_spi(host))
1072 err = mmc_deselect_cards(host);
1073 host->card->state &= ~MMC_STATE_HIGHSPEED;
1074 mmc_release_host(host);
1080 * Resume callback from host.
1082 * This function tries to determine if the same card is still present
1083 * and, if so, restore all state to it.
1085 static int mmc_sd_resume(struct mmc_host *host)
1090 BUG_ON(!host->card);
1092 mmc_claim_host(host);
1093 err = mmc_sd_init_card(host, host->ocr, host->card);
1094 mmc_release_host(host);
1099 static int mmc_sd_power_restore(struct mmc_host *host)
1103 host->card->state &= ~MMC_STATE_HIGHSPEED;
1104 mmc_claim_host(host);
1105 ret = mmc_sd_init_card(host, host->ocr, host->card);
1106 mmc_release_host(host);
1111 static const struct mmc_bus_ops mmc_sd_ops = {
1112 .remove = mmc_sd_remove,
1113 .detect = mmc_sd_detect,
1116 .power_restore = mmc_sd_power_restore,
1117 .alive = mmc_sd_alive,
1120 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1121 .remove = mmc_sd_remove,
1122 .detect = mmc_sd_detect,
1123 .suspend = mmc_sd_suspend,
1124 .resume = mmc_sd_resume,
1125 .power_restore = mmc_sd_power_restore,
1126 .alive = mmc_sd_alive,
1129 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1131 const struct mmc_bus_ops *bus_ops;
1133 if (!mmc_card_is_removable(host))
1134 bus_ops = &mmc_sd_ops_unsafe;
1136 bus_ops = &mmc_sd_ops;
1137 mmc_attach_bus(host, bus_ops);
1141 * Starting point for SD card init.
1143 int mmc_attach_sd(struct mmc_host *host)
1149 WARN_ON(!host->claimed);
1151 /* Disable preset value enable if already set since last time */
1152 if (host->ops->enable_preset_value) {
1153 mmc_host_clk_hold(host);
1154 host->ops->enable_preset_value(host, false);
1155 mmc_host_clk_release(host);
1158 err = mmc_send_app_op_cond(host, 0, &ocr);
1162 mmc_sd_attach_bus_ops(host);
1163 if (host->ocr_avail_sd)
1164 host->ocr_avail = host->ocr_avail_sd;
1167 * We need to get OCR a different way for SPI.
1169 if (mmc_host_is_spi(host)) {
1172 err = mmc_spi_read_ocr(host, 0, &ocr);
1178 * Sanity check the voltages that the card claims to
1182 pr_warning("%s: card claims to support voltages "
1183 "below the defined range. These will be ignored.\n",
1184 mmc_hostname(host));
1188 if ((ocr & MMC_VDD_165_195) &&
1189 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1190 pr_warning("%s: SD card claims to support the "
1191 "incompletely defined 'low voltage range'. This "
1192 "will be ignored.\n", mmc_hostname(host));
1193 ocr &= ~MMC_VDD_165_195;
1196 host->ocr = mmc_select_voltage(host, ocr);
1199 * Can we support the voltage(s) of the card(s)?
1207 * Detect and init the card.
1209 err = mmc_sd_init_card(host, host->ocr, NULL);
1213 mmc_release_host(host);
1214 err = mmc_add_card(host->card);
1215 mmc_claim_host(host);
1222 mmc_release_host(host);
1223 mmc_remove_card(host->card);
1225 mmc_claim_host(host);
1227 mmc_detach_bus(host);
1229 pr_err("%s: error %d whilst initialising SD card\n",
1230 mmc_hostname(host), err);