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>
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
19 #include <linux/mmc/sd.h>
27 static const unsigned int tran_exp[] = {
28 10000, 100000, 1000000, 10000000,
32 static const unsigned char tran_mant[] = {
33 0, 10, 12, 13, 15, 20, 25, 30,
34 35, 40, 45, 50, 55, 60, 70, 80,
37 static const unsigned int tacc_exp[] = {
38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
41 static const unsigned int tacc_mant[] = {
42 0, 10, 12, 13, 15, 20, 25, 30,
43 35, 40, 45, 50, 55, 60, 70, 80,
46 #define UNSTUFF_BITS(resp,start,size) \
48 const int __size = size; \
49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
50 const int __off = 3 - ((start) / 32); \
51 const int __shft = (start) & 31; \
54 __res = resp[__off] >> __shft; \
55 if (__size + __shft > 32) \
56 __res |= resp[__off-1] << ((32 - __shft) % 32); \
61 * Given the decoded CSD structure, decode the raw CID to our CID structure.
63 void mmc_decode_cid(struct mmc_card *card)
65 u32 *resp = card->raw_cid;
67 memset(&card->cid, 0, sizeof(struct mmc_cid));
70 * SD doesn't currently have a version field so we will
71 * have to assume we can parse this.
73 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
74 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
75 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
76 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
77 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
78 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
79 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
80 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
81 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
82 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
83 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
84 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
86 card->cid.year += 2000; /* SD cards year offset */
90 * Given a 128-bit response, decode to our card CSD structure.
92 static int mmc_decode_csd(struct mmc_card *card)
94 struct mmc_csd *csd = &card->csd;
95 unsigned int e, m, csd_struct;
96 u32 *resp = card->raw_csd;
98 csd_struct = UNSTUFF_BITS(resp, 126, 2);
100 switch (csd_struct) {
102 m = UNSTUFF_BITS(resp, 115, 4);
103 e = UNSTUFF_BITS(resp, 112, 3);
104 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
105 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
107 m = UNSTUFF_BITS(resp, 99, 4);
108 e = UNSTUFF_BITS(resp, 96, 3);
109 csd->max_dtr = tran_exp[e] * tran_mant[m];
110 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
112 e = UNSTUFF_BITS(resp, 47, 3);
113 m = UNSTUFF_BITS(resp, 62, 12);
114 csd->capacity = (1 + m) << (e + 2);
116 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
117 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
118 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
119 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
120 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
121 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
122 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
124 if (UNSTUFF_BITS(resp, 46, 1)) {
126 } else if (csd->write_blkbits >= 9) {
127 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
128 csd->erase_size <<= csd->write_blkbits - 9;
133 * This is a block-addressed SDHC or SDXC card. Most
134 * interesting fields are unused and have fixed
135 * values. To avoid getting tripped by buggy cards,
136 * we assume those fixed values ourselves.
138 mmc_card_set_blockaddr(card);
140 csd->tacc_ns = 0; /* Unused */
141 csd->tacc_clks = 0; /* Unused */
143 m = UNSTUFF_BITS(resp, 99, 4);
144 e = UNSTUFF_BITS(resp, 96, 3);
145 csd->max_dtr = tran_exp[e] * tran_mant[m];
146 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
147 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
149 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
150 if (csd->c_size >= 0xFFFF)
151 mmc_card_set_ext_capacity(card);
153 m = UNSTUFF_BITS(resp, 48, 22);
154 csd->capacity = (1 + m) << 10;
156 csd->read_blkbits = 9;
157 csd->read_partial = 0;
158 csd->write_misalign = 0;
159 csd->read_misalign = 0;
160 csd->r2w_factor = 4; /* Unused */
161 csd->write_blkbits = 9;
162 csd->write_partial = 0;
166 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
167 mmc_hostname(card->host), csd_struct);
171 card->erase_size = csd->erase_size;
177 * Given a 64-bit response, decode to our card SCR structure.
179 static int mmc_decode_scr(struct mmc_card *card)
181 struct sd_scr *scr = &card->scr;
182 unsigned int scr_struct;
185 resp[3] = card->raw_scr[1];
186 resp[2] = card->raw_scr[0];
188 scr_struct = UNSTUFF_BITS(resp, 60, 4);
189 if (scr_struct != 0) {
190 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
191 mmc_hostname(card->host), scr_struct);
195 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
196 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
197 if (scr->sda_vsn == SCR_SPEC_VER_2)
198 /* Check if Physical Layer Spec v3.0 is supported */
199 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
201 if (UNSTUFF_BITS(resp, 55, 1))
202 card->erased_byte = 0xFF;
204 card->erased_byte = 0x0;
207 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
212 * Fetch and process SD Status register.
214 static int mmc_read_ssr(struct mmc_card *card)
216 unsigned int au, es, et, eo;
220 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
221 printk(KERN_WARNING "%s: card lacks mandatory SD Status "
222 "function.\n", mmc_hostname(card->host));
226 ssr = kmalloc(64, GFP_KERNEL);
230 err = mmc_app_sd_status(card, ssr);
232 printk(KERN_WARNING "%s: problem reading SD Status "
233 "register.\n", mmc_hostname(card->host));
238 for (i = 0; i < 16; i++)
239 ssr[i] = be32_to_cpu(ssr[i]);
242 * UNSTUFF_BITS only works with four u32s so we have to offset the
243 * bitfield positions accordingly.
245 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
246 if (au > 0 || au <= 9) {
247 card->ssr.au = 1 << (au + 4);
248 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
249 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
250 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
252 card->ssr.erase_timeout = (et * 1000) / es;
253 card->ssr.erase_offset = eo * 1000;
256 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit "
257 "size.\n", mmc_hostname(card->host));
265 * Fetches and decodes switch information
267 static int mmc_read_switch(struct mmc_card *card)
272 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
275 if (!(card->csd.cmdclass & CCC_SWITCH)) {
276 printk(KERN_WARNING "%s: card lacks mandatory switch "
277 "function, performance might suffer.\n",
278 mmc_hostname(card->host));
284 status = kmalloc(64, GFP_KERNEL);
286 printk(KERN_ERR "%s: could not allocate a buffer for "
287 "switch capabilities.\n",
288 mmc_hostname(card->host));
292 /* Find out the supported Bus Speed Modes. */
293 err = mmc_sd_switch(card, 0, 0, 1, status);
296 * If the host or the card can't do the switch,
297 * fail more gracefully.
299 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
302 printk(KERN_WARNING "%s: problem reading Bus Speed modes.\n",
303 mmc_hostname(card->host));
309 if (status[13] & UHS_SDR50_BUS_SPEED)
310 card->sw_caps.hs_max_dtr = 50000000;
312 if (card->scr.sda_spec3) {
313 card->sw_caps.sd3_bus_mode = status[13];
315 /* Find out Driver Strengths supported by the card */
316 err = mmc_sd_switch(card, 0, 2, 1, status);
319 * If the host or the card can't do the switch,
320 * fail more gracefully.
322 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
325 printk(KERN_WARNING "%s: problem reading "
326 "Driver Strength.\n",
327 mmc_hostname(card->host));
333 card->sw_caps.sd3_drv_type = status[9];
335 /* Find out Current Limits supported by the card */
336 err = mmc_sd_switch(card, 0, 3, 1, status);
339 * If the host or the card can't do the switch,
340 * fail more gracefully.
342 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
345 printk(KERN_WARNING "%s: problem reading "
347 mmc_hostname(card->host));
353 card->sw_caps.sd3_curr_limit = status[7];
363 * Test if the card supports high-speed mode and, if so, switch to it.
365 int mmc_sd_switch_hs(struct mmc_card *card)
370 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
373 if (!(card->csd.cmdclass & CCC_SWITCH))
376 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
379 if (card->sw_caps.hs_max_dtr == 0)
384 status = kmalloc(64, GFP_KERNEL);
386 printk(KERN_ERR "%s: could not allocate a buffer for "
387 "switch capabilities.\n", mmc_hostname(card->host));
391 err = mmc_sd_switch(card, 1, 0, 1, status);
395 if ((status[16] & 0xF) != 1) {
396 printk(KERN_WARNING "%s: Problem switching card "
397 "into high-speed mode!\n",
398 mmc_hostname(card->host));
410 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
412 int host_drv_type = 0, card_drv_type = 0;
416 * If the host doesn't support any of the Driver Types A,C or D,
417 * default Driver Type B is used.
419 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
420 | MMC_CAP_DRIVER_TYPE_D)))
423 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) {
424 host_drv_type = MMC_SET_DRIVER_TYPE_A;
425 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
426 card_drv_type = MMC_SET_DRIVER_TYPE_A;
427 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_B)
428 card_drv_type = MMC_SET_DRIVER_TYPE_B;
429 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
430 card_drv_type = MMC_SET_DRIVER_TYPE_C;
431 } else if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) {
432 host_drv_type = MMC_SET_DRIVER_TYPE_C;
433 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
434 card_drv_type = MMC_SET_DRIVER_TYPE_C;
435 } else if (!(card->host->caps & MMC_CAP_DRIVER_TYPE_D)) {
437 * If we are here, that means only the default driver type
438 * B is supported by the host.
440 host_drv_type = MMC_SET_DRIVER_TYPE_B;
441 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_B)
442 card_drv_type = MMC_SET_DRIVER_TYPE_B;
443 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
444 card_drv_type = MMC_SET_DRIVER_TYPE_C;
447 err = mmc_sd_switch(card, 1, 2, card_drv_type, status);
451 if ((status[15] & 0xF) != card_drv_type) {
452 printk(KERN_WARNING "%s: Problem setting driver strength!\n",
453 mmc_hostname(card->host));
457 mmc_set_driver_type(card->host, host_drv_type);
462 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
464 unsigned int bus_speed = 0, timing = 0;
468 * If the host doesn't support any of the UHS-I modes, fallback on
471 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
472 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
475 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
476 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
477 bus_speed = UHS_SDR104_BUS_SPEED;
478 timing = MMC_TIMING_UHS_SDR104;
479 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
480 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
481 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
482 bus_speed = UHS_DDR50_BUS_SPEED;
483 timing = MMC_TIMING_UHS_DDR50;
484 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
485 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
486 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
487 SD_MODE_UHS_SDR50)) {
488 bus_speed = UHS_SDR50_BUS_SPEED;
489 timing = MMC_TIMING_UHS_SDR50;
490 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
491 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
492 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
493 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
494 bus_speed = UHS_SDR25_BUS_SPEED;
495 timing = MMC_TIMING_UHS_SDR25;
496 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
498 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
499 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
500 SD_MODE_UHS_SDR12)) {
501 bus_speed = UHS_SDR12_BUS_SPEED;
502 timing = MMC_TIMING_UHS_SDR12;
503 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
506 card->sd_bus_speed = bus_speed;
507 err = mmc_sd_switch(card, 1, 0, bus_speed, status);
511 if ((status[16] & 0xF) != bus_speed)
512 printk(KERN_WARNING "%s: Problem setting bus speed mode!\n",
513 mmc_hostname(card->host));
515 mmc_set_timing(card->host, timing);
516 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
522 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
524 int current_limit = 0;
528 * Current limit switch is only defined for SDR50, SDR104, and DDR50
529 * bus speed modes. For other bus speed modes, we set the default
530 * current limit of 200mA.
532 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
533 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
534 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) {
535 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
536 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
537 current_limit = SD_SET_CURRENT_LIMIT_800;
538 else if (card->sw_caps.sd3_curr_limit &
540 current_limit = SD_SET_CURRENT_LIMIT_600;
541 else if (card->sw_caps.sd3_curr_limit &
543 current_limit = SD_SET_CURRENT_LIMIT_400;
544 else if (card->sw_caps.sd3_curr_limit &
546 current_limit = SD_SET_CURRENT_LIMIT_200;
547 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
548 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
549 current_limit = SD_SET_CURRENT_LIMIT_600;
550 else if (card->sw_caps.sd3_curr_limit &
552 current_limit = SD_SET_CURRENT_LIMIT_400;
553 else if (card->sw_caps.sd3_curr_limit &
555 current_limit = SD_SET_CURRENT_LIMIT_200;
556 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
557 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
558 current_limit = SD_SET_CURRENT_LIMIT_400;
559 else if (card->sw_caps.sd3_curr_limit &
561 current_limit = SD_SET_CURRENT_LIMIT_200;
562 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
563 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
564 current_limit = SD_SET_CURRENT_LIMIT_200;
567 current_limit = SD_SET_CURRENT_LIMIT_200;
569 err = mmc_sd_switch(card, 1, 3, current_limit, status);
573 if (((status[15] >> 4) & 0x0F) != current_limit)
574 printk(KERN_WARNING "%s: Problem setting current limit!\n",
575 mmc_hostname(card->host));
581 * UHS-I specific initialization procedure
583 static int mmc_sd_init_uhs_card(struct mmc_card *card)
588 if (!card->scr.sda_spec3)
591 if (!(card->csd.cmdclass & CCC_SWITCH))
594 status = kmalloc(64, GFP_KERNEL);
596 printk(KERN_ERR "%s: could not allocate a buffer for "
597 "switch capabilities.\n", mmc_hostname(card->host));
601 /* Set 4-bit bus width */
602 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
603 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
604 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
608 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
611 /* Set the driver strength for the card */
612 err = sd_select_driver_type(card, status);
616 /* Set bus speed mode of the card */
617 err = sd_set_bus_speed_mode(card, status);
621 /* Set current limit for the card */
622 err = sd_set_current_limit(card, status);
626 /* SPI mode doesn't define CMD19 */
627 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
628 err = card->host->ops->execute_tuning(card->host);
636 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
637 card->raw_cid[2], card->raw_cid[3]);
638 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
639 card->raw_csd[2], card->raw_csd[3]);
640 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
641 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
642 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
643 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
644 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
645 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
646 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
647 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
648 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
649 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
652 static struct attribute *sd_std_attrs[] = {
657 &dev_attr_erase_size.attr,
658 &dev_attr_preferred_erase_size.attr,
659 &dev_attr_fwrev.attr,
660 &dev_attr_hwrev.attr,
661 &dev_attr_manfid.attr,
663 &dev_attr_oemid.attr,
664 &dev_attr_serial.attr,
668 static struct attribute_group sd_std_attr_group = {
669 .attrs = sd_std_attrs,
672 static const struct attribute_group *sd_attr_groups[] = {
677 struct device_type sd_type = {
678 .groups = sd_attr_groups,
682 * Fetch CID from card.
684 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
689 * Since we're changing the OCR value, we seem to
690 * need to tell some cards to go back to the idle
691 * state. We wait 1ms to give cards time to
697 * If SD_SEND_IF_COND indicates an SD 2.0
698 * compliant card and we should set bit 30
699 * of the ocr to indicate that we can handle
700 * block-addressed SDHC cards.
702 err = mmc_send_if_cond(host, ocr);
707 * If the host supports one of UHS-I modes, request the card
708 * to switch to 1.8V signaling level.
710 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
711 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
714 /* If the host can supply more than 150mA, XPC should be set to 1. */
715 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 |
716 MMC_CAP_SET_XPC_180))
720 err = mmc_send_app_op_cond(host, ocr, rocr);
725 * In case CCS and S18A in the response is set, start Signal Voltage
726 * Switch procedure. SPI mode doesn't support CMD11.
728 if (!mmc_host_is_spi(host) && rocr &&
729 ((*rocr & 0x41000000) == 0x41000000)) {
730 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
737 if (mmc_host_is_spi(host))
738 err = mmc_send_cid(host, cid);
740 err = mmc_all_send_cid(host, cid);
745 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
750 * Fetch CSD from card.
752 err = mmc_send_csd(card, card->raw_csd);
756 err = mmc_decode_csd(card);
763 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
767 #ifdef CONFIG_MMC_PARANOID_SD_INIT
773 * Fetch SCR from card.
775 err = mmc_app_send_scr(card, card->raw_scr);
779 err = mmc_decode_scr(card);
784 * Fetch and process SD Status register.
786 err = mmc_read_ssr(card);
790 /* Erase init depends on CSD and SSR */
791 mmc_init_erase(card);
794 * Fetch switch information from card.
796 #ifdef CONFIG_MMC_PARANOID_SD_INIT
797 for (retries = 1; retries <= 3; retries++) {
798 err = mmc_read_switch(card);
808 "%s: read switch failed (attempt %d)\n",
809 mmc_hostname(host), retries);
813 err = mmc_read_switch(card);
821 * For SPI, enable CRC as appropriate.
822 * This CRC enable is located AFTER the reading of the
823 * card registers because some SDHC cards are not able
824 * to provide valid CRCs for non-512-byte blocks.
826 if (mmc_host_is_spi(host)) {
827 err = mmc_spi_set_crc(host, use_spi_crc);
833 * Check if read-only switch is active.
838 if (host->ops->get_ro)
839 ro = host->ops->get_ro(host);
842 printk(KERN_WARNING "%s: host does not "
843 "support reading read-only "
844 "switch. assuming write-enable.\n",
847 mmc_card_set_readonly(card);
854 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
856 unsigned max_dtr = (unsigned int)-1;
858 if (mmc_card_highspeed(card)) {
859 if (max_dtr > card->sw_caps.hs_max_dtr)
860 max_dtr = card->sw_caps.hs_max_dtr;
861 } else if (max_dtr > card->csd.max_dtr) {
862 max_dtr = card->csd.max_dtr;
868 void mmc_sd_go_highspeed(struct mmc_card *card)
870 mmc_card_set_highspeed(card);
871 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
875 * Handle the detection and initialisation of a card.
877 * In the case of a resume, "oldcard" will contain the card
878 * we're trying to reinitialise.
880 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
881 struct mmc_card *oldcard)
883 struct mmc_card *card;
889 WARN_ON(!host->claimed);
891 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
896 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
902 * Allocate card structure.
904 card = mmc_alloc_card(host, &sd_type);
906 return PTR_ERR(card);
908 card->type = MMC_TYPE_SD;
909 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
913 * For native busses: get card RCA and quit open drain mode.
915 if (!mmc_host_is_spi(host)) {
916 err = mmc_send_relative_addr(host, &card->rca);
920 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
924 err = mmc_sd_get_csd(host, card);
928 mmc_decode_cid(card);
932 * Select card, as all following commands rely on that.
934 if (!mmc_host_is_spi(host)) {
935 err = mmc_select_card(card);
940 err = mmc_sd_setup_card(host, card, oldcard != NULL);
944 /* Initialization sequence for UHS-I cards */
945 if (rocr & SD_ROCR_S18A) {
946 err = mmc_sd_init_uhs_card(card);
950 /* Card is an ultra-high-speed card */
951 mmc_sd_card_set_uhs(card);
954 * Since initialization is now complete, enable preset
955 * value registers for UHS-I cards.
957 if (host->ops->enable_preset_value)
958 host->ops->enable_preset_value(host, true);
961 * Attempt to change to high-speed (if supported)
963 err = mmc_sd_switch_hs(card);
965 mmc_sd_go_highspeed(card);
972 mmc_set_clock(host, mmc_sd_get_max_clock(card));
975 * Switch to wider bus (if supported).
977 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
978 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
979 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
983 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
992 mmc_remove_card(card);
998 * Host is being removed. Free up the current card.
1000 static void mmc_sd_remove(struct mmc_host *host)
1003 BUG_ON(!host->card);
1005 mmc_remove_card(host->card);
1010 * Card detection callback from host.
1012 static void mmc_sd_detect(struct mmc_host *host)
1015 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1020 BUG_ON(!host->card);
1022 mmc_claim_host(host);
1025 * Just check if our card has been removed.
1027 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1029 err = mmc_send_status(host->card, NULL);
1038 printk(KERN_ERR "%s(%s): Unable to re-detect card (%d)\n",
1039 __func__, mmc_hostname(host), err);
1042 err = mmc_send_status(host->card, NULL);
1044 mmc_release_host(host);
1047 mmc_sd_remove(host);
1049 mmc_claim_host(host);
1050 mmc_detach_bus(host);
1051 mmc_power_off(host);
1052 mmc_release_host(host);
1057 * Suspend callback from host.
1059 static int mmc_sd_suspend(struct mmc_host *host)
1062 BUG_ON(!host->card);
1064 mmc_claim_host(host);
1065 if (!mmc_host_is_spi(host))
1066 mmc_deselect_cards(host);
1067 host->card->state &= ~MMC_STATE_HIGHSPEED;
1068 mmc_release_host(host);
1074 * Resume callback from host.
1076 * This function tries to determine if the same card is still present
1077 * and, if so, restore all state to it.
1079 static int mmc_sd_resume(struct mmc_host *host)
1082 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1087 BUG_ON(!host->card);
1089 mmc_claim_host(host);
1090 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1093 err = mmc_sd_init_card(host, host->ocr, host->card);
1096 printk(KERN_ERR "%s: Re-init card rc = %d (retries = %d)\n",
1097 mmc_hostname(host), err, retries);
1105 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,
1132 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1133 .remove = mmc_sd_remove,
1134 .detect = mmc_sd_detect,
1135 .suspend = mmc_sd_suspend,
1136 .resume = mmc_sd_resume,
1137 .power_restore = mmc_sd_power_restore,
1140 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1142 const struct mmc_bus_ops *bus_ops;
1144 if (!mmc_card_is_removable(host))
1145 bus_ops = &mmc_sd_ops_unsafe;
1147 bus_ops = &mmc_sd_ops;
1148 mmc_attach_bus(host, bus_ops);
1152 * Starting point for SD card init.
1154 int mmc_attach_sd(struct mmc_host *host)
1158 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1163 WARN_ON(!host->claimed);
1165 /* Make sure we are at 3.3V signalling voltage */
1166 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
1170 /* Disable preset value enable if already set since last time */
1171 if (host->ops->enable_preset_value)
1172 host->ops->enable_preset_value(host, false);
1174 err = mmc_send_app_op_cond(host, 0, &ocr);
1178 mmc_sd_attach_bus_ops(host);
1179 if (host->ocr_avail_sd)
1180 host->ocr_avail = host->ocr_avail_sd;
1183 * We need to get OCR a different way for SPI.
1185 if (mmc_host_is_spi(host)) {
1188 err = mmc_spi_read_ocr(host, 0, &ocr);
1194 * Sanity check the voltages that the card claims to
1198 printk(KERN_WARNING "%s: card claims to support voltages "
1199 "below the defined range. These will be ignored.\n",
1200 mmc_hostname(host));
1204 if ((ocr & MMC_VDD_165_195) &&
1205 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1206 printk(KERN_WARNING "%s: SD card claims to support the "
1207 "incompletely defined 'low voltage range'. This "
1208 "will be ignored.\n", mmc_hostname(host));
1209 ocr &= ~MMC_VDD_165_195;
1212 host->ocr = mmc_select_voltage(host, ocr);
1215 * Can we support the voltage(s) of the card(s)?
1223 * Detect and init the card.
1225 #ifdef CONFIG_MMC_PARANOID_SD_INIT
1228 err = mmc_sd_init_card(host, host->ocr, NULL);
1237 printk(KERN_ERR "%s: mmc_sd_init_card() failure (err = %d)\n",
1238 mmc_hostname(host), err);
1242 err = mmc_sd_init_card(host, host->ocr, NULL);
1247 mmc_release_host(host);
1248 err = mmc_add_card(host->card);
1249 mmc_claim_host(host);
1256 mmc_release_host(host);
1257 mmc_remove_card(host->card);
1259 mmc_claim_host(host);
1261 mmc_detach_bus(host);
1263 printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
1264 mmc_hostname(host), err);