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 (!mmc_host_uhs(card->host)) {
448 card->sd_bus_speed = 0;
452 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
453 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
454 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
455 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
456 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
457 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
458 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
459 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
460 SD_MODE_UHS_SDR50)) {
461 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
462 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
463 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
464 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
465 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
466 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
467 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
468 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
469 SD_MODE_UHS_SDR12)) {
470 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
474 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
477 unsigned int timing = 0;
479 switch (card->sd_bus_speed) {
480 case UHS_SDR104_BUS_SPEED:
481 timing = MMC_TIMING_UHS_SDR104;
482 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
484 case UHS_DDR50_BUS_SPEED:
485 timing = MMC_TIMING_UHS_DDR50;
486 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
488 case UHS_SDR50_BUS_SPEED:
489 timing = MMC_TIMING_UHS_SDR50;
490 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
492 case UHS_SDR25_BUS_SPEED:
493 timing = MMC_TIMING_UHS_SDR25;
494 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
496 case UHS_SDR12_BUS_SPEED:
497 timing = MMC_TIMING_UHS_SDR12;
498 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
504 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
508 if ((status[16] & 0xF) != card->sd_bus_speed)
509 pr_warning("%s: Problem setting bus speed mode!\n",
510 mmc_hostname(card->host));
512 mmc_set_timing(card->host, timing);
513 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
519 /* Get host's max current setting at its current voltage */
520 static u32 sd_get_host_max_current(struct mmc_host *host)
522 u32 voltage, max_current;
524 voltage = 1 << host->ios.vdd;
526 case MMC_VDD_165_195:
527 max_current = host->max_current_180;
531 max_current = host->max_current_300;
535 max_current = host->max_current_330;
544 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
546 int current_limit = SD_SET_CURRENT_NO_CHANGE;
551 * Current limit switch is only defined for SDR50, SDR104, and DDR50
552 * bus speed modes. For other bus speed modes, we do not change the
555 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
556 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
557 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
561 * Host has different current capabilities when operating at
562 * different voltages, so find out its max current first.
564 max_current = sd_get_host_max_current(card->host);
567 * We only check host's capability here, if we set a limit that is
568 * higher than the card's maximum current, the card will be using its
569 * maximum current, e.g. if the card's maximum current is 300ma, and
570 * when we set current limit to 200ma, the card will draw 200ma, and
571 * when we set current limit to 400/600/800ma, the card will draw its
572 * maximum 300ma from the host.
574 if (max_current >= 800)
575 current_limit = SD_SET_CURRENT_LIMIT_800;
576 else if (max_current >= 600)
577 current_limit = SD_SET_CURRENT_LIMIT_600;
578 else if (max_current >= 400)
579 current_limit = SD_SET_CURRENT_LIMIT_400;
580 else if (max_current >= 200)
581 current_limit = SD_SET_CURRENT_LIMIT_200;
583 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
584 err = mmc_sd_switch(card, 1, 3, current_limit, status);
588 if (((status[15] >> 4) & 0x0F) != current_limit)
589 pr_warning("%s: Problem setting current limit!\n",
590 mmc_hostname(card->host));
598 * UHS-I specific initialization procedure
600 static int mmc_sd_init_uhs_card(struct mmc_card *card)
605 if (!card->scr.sda_spec3)
608 if (!(card->csd.cmdclass & CCC_SWITCH))
611 status = kmalloc(64, GFP_KERNEL);
613 pr_err("%s: could not allocate a buffer for "
614 "switch capabilities.\n", mmc_hostname(card->host));
618 /* Set 4-bit bus width */
619 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
620 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
621 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
625 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
629 * Select the bus speed mode depending on host
630 * and card capability.
632 sd_update_bus_speed_mode(card);
634 /* Set the driver strength for the card */
635 err = sd_select_driver_type(card, status);
639 /* Set current limit for the card */
640 err = sd_set_current_limit(card, status);
644 /* Set bus speed mode of the card */
645 err = sd_set_bus_speed_mode(card, status);
649 /* SPI mode doesn't define CMD19 */
650 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning) {
651 mmc_host_clk_hold(card->host);
652 err = card->host->ops->execute_tuning(card->host,
653 MMC_SEND_TUNING_BLOCK);
654 mmc_host_clk_release(card->host);
663 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
664 card->raw_cid[2], card->raw_cid[3]);
665 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
666 card->raw_csd[2], card->raw_csd[3]);
667 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
668 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
669 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
670 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
671 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
672 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
673 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
674 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
675 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
676 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
679 static struct attribute *sd_std_attrs[] = {
684 &dev_attr_erase_size.attr,
685 &dev_attr_preferred_erase_size.attr,
686 &dev_attr_fwrev.attr,
687 &dev_attr_hwrev.attr,
688 &dev_attr_manfid.attr,
690 &dev_attr_oemid.attr,
691 &dev_attr_serial.attr,
695 static struct attribute_group sd_std_attr_group = {
696 .attrs = sd_std_attrs,
699 static const struct attribute_group *sd_attr_groups[] = {
704 struct device_type sd_type = {
705 .groups = sd_attr_groups,
709 * Fetch CID from card.
711 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
720 pr_warning("%s: Skipping voltage switch\n",
725 * Since we're changing the OCR value, we seem to
726 * need to tell some cards to go back to the idle
727 * state. We wait 1ms to give cards time to
733 * If SD_SEND_IF_COND indicates an SD 2.0
734 * compliant card and we should set bit 30
735 * of the ocr to indicate that we can handle
736 * block-addressed SDHC cards.
738 err = mmc_send_if_cond(host, ocr);
743 * If the host supports one of UHS-I modes, request the card
744 * to switch to 1.8V signaling level. If the card has failed
745 * repeatedly to switch however, skip this.
747 if (retries && mmc_host_uhs(host))
751 * If the host can supply more than 150mA at current voltage,
752 * XPC should be set to 1.
754 max_current = sd_get_host_max_current(host);
755 if (max_current > 150)
758 err = mmc_send_app_op_cond(host, ocr, rocr);
763 * In case CCS and S18A in the response is set, start Signal Voltage
764 * Switch procedure. SPI mode doesn't support CMD11.
766 if (!mmc_host_is_spi(host) && rocr &&
767 ((*rocr & 0x41000000) == 0x41000000)) {
768 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
769 if (err == -EAGAIN) {
778 if (mmc_host_is_spi(host))
779 err = mmc_send_cid(host, cid);
781 err = mmc_all_send_cid(host, cid);
786 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
791 * Fetch CSD from card.
793 err = mmc_send_csd(card, card->raw_csd);
797 err = mmc_decode_csd(card);
804 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
811 * Fetch SCR from card.
813 err = mmc_app_send_scr(card, card->raw_scr);
817 err = mmc_decode_scr(card);
822 * Fetch and process SD Status register.
824 err = mmc_read_ssr(card);
828 /* Erase init depends on CSD and SSR */
829 mmc_init_erase(card);
832 * Fetch switch information from card.
834 err = mmc_read_switch(card);
840 * For SPI, enable CRC as appropriate.
841 * This CRC enable is located AFTER the reading of the
842 * card registers because some SDHC cards are not able
843 * to provide valid CRCs for non-512-byte blocks.
845 if (mmc_host_is_spi(host)) {
846 err = mmc_spi_set_crc(host, use_spi_crc);
852 * Check if read-only switch is active.
857 if (host->ops->get_ro) {
858 mmc_host_clk_hold(card->host);
859 ro = host->ops->get_ro(host);
860 mmc_host_clk_release(card->host);
864 pr_warning("%s: host does not "
865 "support reading read-only "
866 "switch. assuming write-enable.\n",
869 mmc_card_set_readonly(card);
876 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
878 unsigned max_dtr = (unsigned int)-1;
880 if (mmc_card_highspeed(card)) {
881 if (max_dtr > card->sw_caps.hs_max_dtr)
882 max_dtr = card->sw_caps.hs_max_dtr;
883 } else if (max_dtr > card->csd.max_dtr) {
884 max_dtr = card->csd.max_dtr;
890 void mmc_sd_go_highspeed(struct mmc_card *card)
892 mmc_card_set_highspeed(card);
893 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
897 * Handle the detection and initialisation of a card.
899 * In the case of a resume, "oldcard" will contain the card
900 * we're trying to reinitialise.
902 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
903 struct mmc_card *oldcard)
905 struct mmc_card *card;
911 WARN_ON(!host->claimed);
913 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
918 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
924 * Allocate card structure.
926 card = mmc_alloc_card(host, &sd_type);
928 return PTR_ERR(card);
930 card->type = MMC_TYPE_SD;
931 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
935 * For native busses: get card RCA and quit open drain mode.
937 if (!mmc_host_is_spi(host)) {
938 err = mmc_send_relative_addr(host, &card->rca);
944 err = mmc_sd_get_csd(host, card);
948 mmc_decode_cid(card);
952 * Select card, as all following commands rely on that.
954 if (!mmc_host_is_spi(host)) {
955 err = mmc_select_card(card);
960 err = mmc_sd_setup_card(host, card, oldcard != NULL);
964 /* Initialization sequence for UHS-I cards */
965 if (rocr & SD_ROCR_S18A) {
966 err = mmc_sd_init_uhs_card(card);
970 /* Card is an ultra-high-speed card */
971 mmc_card_set_uhs(card);
974 * Attempt to change to high-speed (if supported)
976 err = mmc_sd_switch_hs(card);
978 mmc_sd_go_highspeed(card);
985 mmc_set_clock(host, mmc_sd_get_max_clock(card));
988 * Switch to wider bus (if supported).
990 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
991 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
992 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
996 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1005 mmc_remove_card(card);
1011 * Host is being removed. Free up the current card.
1013 static void mmc_sd_remove(struct mmc_host *host)
1016 BUG_ON(!host->card);
1018 mmc_remove_card(host->card);
1023 * Card detection - card is alive.
1025 static int mmc_sd_alive(struct mmc_host *host)
1027 return mmc_send_status(host->card, NULL);
1031 * Card detection callback from host.
1033 static void mmc_sd_detect(struct mmc_host *host)
1038 BUG_ON(!host->card);
1040 mmc_claim_host(host);
1043 * Just check if our card has been removed.
1045 err = _mmc_detect_card_removed(host);
1047 mmc_release_host(host);
1050 mmc_sd_remove(host);
1052 mmc_claim_host(host);
1053 mmc_detach_bus(host);
1054 mmc_power_off(host);
1055 mmc_release_host(host);
1060 * Suspend callback from host.
1062 static int mmc_sd_suspend(struct mmc_host *host)
1067 BUG_ON(!host->card);
1069 mmc_claim_host(host);
1070 if (!mmc_host_is_spi(host))
1071 err = mmc_deselect_cards(host);
1072 host->card->state &= ~MMC_STATE_HIGHSPEED;
1073 mmc_release_host(host);
1079 * Resume callback from host.
1081 * This function tries to determine if the same card is still present
1082 * and, if so, restore all state to it.
1084 static int mmc_sd_resume(struct mmc_host *host)
1089 BUG_ON(!host->card);
1091 mmc_claim_host(host);
1092 err = mmc_sd_init_card(host, host->ocr, host->card);
1093 mmc_release_host(host);
1098 static int mmc_sd_power_restore(struct mmc_host *host)
1102 host->card->state &= ~MMC_STATE_HIGHSPEED;
1103 mmc_claim_host(host);
1104 ret = mmc_sd_init_card(host, host->ocr, host->card);
1105 mmc_release_host(host);
1110 static const struct mmc_bus_ops mmc_sd_ops = {
1111 .remove = mmc_sd_remove,
1112 .detect = mmc_sd_detect,
1115 .power_restore = mmc_sd_power_restore,
1116 .alive = mmc_sd_alive,
1119 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1120 .remove = mmc_sd_remove,
1121 .detect = mmc_sd_detect,
1122 .suspend = mmc_sd_suspend,
1123 .resume = mmc_sd_resume,
1124 .power_restore = mmc_sd_power_restore,
1125 .alive = mmc_sd_alive,
1128 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1130 const struct mmc_bus_ops *bus_ops;
1132 if (!mmc_card_is_removable(host))
1133 bus_ops = &mmc_sd_ops_unsafe;
1135 bus_ops = &mmc_sd_ops;
1136 mmc_attach_bus(host, bus_ops);
1140 * Starting point for SD card init.
1142 int mmc_attach_sd(struct mmc_host *host)
1148 WARN_ON(!host->claimed);
1150 err = mmc_send_app_op_cond(host, 0, &ocr);
1154 mmc_sd_attach_bus_ops(host);
1155 if (host->ocr_avail_sd)
1156 host->ocr_avail = host->ocr_avail_sd;
1159 * We need to get OCR a different way for SPI.
1161 if (mmc_host_is_spi(host)) {
1164 err = mmc_spi_read_ocr(host, 0, &ocr);
1170 * Sanity check the voltages that the card claims to
1174 pr_warning("%s: card claims to support voltages "
1175 "below the defined range. These will be ignored.\n",
1176 mmc_hostname(host));
1180 if ((ocr & MMC_VDD_165_195) &&
1181 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1182 pr_warning("%s: SD card claims to support the "
1183 "incompletely defined 'low voltage range'. This "
1184 "will be ignored.\n", mmc_hostname(host));
1185 ocr &= ~MMC_VDD_165_195;
1188 host->ocr = mmc_select_voltage(host, ocr);
1191 * Can we support the voltage(s) of the card(s)?
1199 * Detect and init the card.
1201 err = mmc_sd_init_card(host, host->ocr, NULL);
1205 mmc_release_host(host);
1206 err = mmc_add_card(host->card);
1207 mmc_claim_host(host);
1214 mmc_release_host(host);
1215 mmc_remove_card(host->card);
1217 mmc_claim_host(host);
1219 mmc_detach_bus(host);
1221 pr_err("%s: error %d whilst initialising SD card\n",
1222 mmc_hostname(host), err);