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;
210 * Fetch and process SD Status register.
212 static int mmc_read_ssr(struct mmc_card *card)
214 unsigned int au, es, et, eo;
218 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
219 printk(KERN_WARNING "%s: card lacks mandatory SD Status "
220 "function.\n", mmc_hostname(card->host));
224 ssr = kmalloc(64, GFP_KERNEL);
228 err = mmc_app_sd_status(card, ssr);
230 printk(KERN_WARNING "%s: problem reading SD Status "
231 "register.\n", mmc_hostname(card->host));
236 for (i = 0; i < 16; i++)
237 ssr[i] = be32_to_cpu(ssr[i]);
240 * UNSTUFF_BITS only works with four u32s so we have to offset the
241 * bitfield positions accordingly.
243 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
244 if (au > 0 || au <= 9) {
245 card->ssr.au = 1 << (au + 4);
246 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
247 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
248 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
250 card->ssr.erase_timeout = (et * 1000) / es;
251 card->ssr.erase_offset = eo * 1000;
254 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit "
255 "size.\n", mmc_hostname(card->host));
263 * Fetches and decodes switch information
265 static int mmc_read_switch(struct mmc_card *card)
270 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
273 if (!(card->csd.cmdclass & CCC_SWITCH)) {
274 printk(KERN_WARNING "%s: card lacks mandatory switch "
275 "function, performance might suffer.\n",
276 mmc_hostname(card->host));
282 status = kmalloc(64, GFP_KERNEL);
284 printk(KERN_ERR "%s: could not allocate a buffer for "
285 "switch capabilities.\n",
286 mmc_hostname(card->host));
290 /* Find out the supported Bus Speed Modes. */
291 err = mmc_sd_switch(card, 0, 0, 1, status);
294 * If the host or the card can't do the switch,
295 * fail more gracefully.
297 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
300 printk(KERN_WARNING "%s: problem reading Bus Speed modes.\n",
301 mmc_hostname(card->host));
307 if (card->scr.sda_spec3) {
308 card->sw_caps.sd3_bus_mode = status[13];
310 /* Find out Driver Strengths supported by the card */
311 err = mmc_sd_switch(card, 0, 2, 1, status);
314 * If the host or the card can't do the switch,
315 * fail more gracefully.
317 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
320 printk(KERN_WARNING "%s: problem reading "
321 "Driver Strength.\n",
322 mmc_hostname(card->host));
328 card->sw_caps.sd3_drv_type = status[9];
330 /* Find out Current Limits supported by the card */
331 err = mmc_sd_switch(card, 0, 3, 1, status);
334 * If the host or the card can't do the switch,
335 * fail more gracefully.
337 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
340 printk(KERN_WARNING "%s: problem reading "
342 mmc_hostname(card->host));
348 card->sw_caps.sd3_curr_limit = status[7];
350 if (status[13] & 0x02)
351 card->sw_caps.hs_max_dtr = 50000000;
361 * Test if the card supports high-speed mode and, if so, switch to it.
363 int mmc_sd_switch_hs(struct mmc_card *card)
368 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
371 if (!(card->csd.cmdclass & CCC_SWITCH))
374 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
377 if (card->sw_caps.hs_max_dtr == 0)
382 status = kmalloc(64, GFP_KERNEL);
384 printk(KERN_ERR "%s: could not allocate a buffer for "
385 "switch capabilities.\n", mmc_hostname(card->host));
389 err = mmc_sd_switch(card, 1, 0, 1, status);
393 if ((status[16] & 0xF) != 1) {
394 printk(KERN_WARNING "%s: Problem switching card "
395 "into high-speed mode!\n",
396 mmc_hostname(card->host));
408 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
410 int host_drv_type = 0, card_drv_type = 0;
414 * If the host doesn't support any of the Driver Types A,C or D,
415 * default Driver Type B is used.
417 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
418 | MMC_CAP_DRIVER_TYPE_D)))
421 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) {
422 host_drv_type = MMC_SET_DRIVER_TYPE_A;
423 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
424 card_drv_type = MMC_SET_DRIVER_TYPE_A;
425 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_B)
426 card_drv_type = MMC_SET_DRIVER_TYPE_B;
427 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
428 card_drv_type = MMC_SET_DRIVER_TYPE_C;
429 } else if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) {
430 host_drv_type = MMC_SET_DRIVER_TYPE_C;
431 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
432 card_drv_type = MMC_SET_DRIVER_TYPE_C;
433 } else if (!(card->host->caps & MMC_CAP_DRIVER_TYPE_D)) {
435 * If we are here, that means only the default driver type
436 * B is supported by the host.
438 host_drv_type = MMC_SET_DRIVER_TYPE_B;
439 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_B)
440 card_drv_type = MMC_SET_DRIVER_TYPE_B;
441 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
442 card_drv_type = MMC_SET_DRIVER_TYPE_C;
445 err = mmc_sd_switch(card, 1, 2, card_drv_type, status);
449 if ((status[15] & 0xF) != card_drv_type) {
450 printk(KERN_WARNING "%s: Problem setting driver strength!\n",
451 mmc_hostname(card->host));
455 mmc_set_driver_type(card->host, host_drv_type);
460 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
462 unsigned int bus_speed = 0, timing = 0;
466 * If the host doesn't support any of the UHS-I modes, fallback on
469 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
470 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
473 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
474 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
475 bus_speed = UHS_SDR104_BUS_SPEED;
476 timing = MMC_TIMING_UHS_SDR104;
477 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
478 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
479 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
480 bus_speed = UHS_DDR50_BUS_SPEED;
481 timing = MMC_TIMING_UHS_DDR50;
482 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
483 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
484 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
485 SD_MODE_UHS_SDR50)) {
486 bus_speed = UHS_SDR50_BUS_SPEED;
487 timing = MMC_TIMING_UHS_SDR50;
488 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
489 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
490 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
491 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
492 bus_speed = UHS_SDR25_BUS_SPEED;
493 timing = MMC_TIMING_UHS_SDR25;
494 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
495 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
496 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
497 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
498 SD_MODE_UHS_SDR12)) {
499 bus_speed = UHS_SDR12_BUS_SPEED;
500 timing = MMC_TIMING_UHS_SDR12;
501 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
504 card->sd_bus_speed = bus_speed;
505 err = mmc_sd_switch(card, 1, 0, bus_speed, status);
509 if ((status[16] & 0xF) != bus_speed)
510 printk(KERN_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 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
522 int current_limit = 0;
526 * Current limit switch is only defined for SDR50, SDR104, and DDR50
527 * bus speed modes. For other bus speed modes, we set the default
528 * current limit of 200mA.
530 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
531 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
532 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) {
533 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
534 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
535 current_limit = SD_SET_CURRENT_LIMIT_800;
536 else if (card->sw_caps.sd3_curr_limit &
538 current_limit = SD_SET_CURRENT_LIMIT_600;
539 else if (card->sw_caps.sd3_curr_limit &
541 current_limit = SD_SET_CURRENT_LIMIT_400;
542 else if (card->sw_caps.sd3_curr_limit &
544 current_limit = SD_SET_CURRENT_LIMIT_200;
545 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
546 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
547 current_limit = SD_SET_CURRENT_LIMIT_600;
548 else if (card->sw_caps.sd3_curr_limit &
550 current_limit = SD_SET_CURRENT_LIMIT_400;
551 else if (card->sw_caps.sd3_curr_limit &
553 current_limit = SD_SET_CURRENT_LIMIT_200;
554 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
555 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
556 current_limit = SD_SET_CURRENT_LIMIT_400;
557 else if (card->sw_caps.sd3_curr_limit &
559 current_limit = SD_SET_CURRENT_LIMIT_200;
560 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
561 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
562 current_limit = SD_SET_CURRENT_LIMIT_200;
565 current_limit = SD_SET_CURRENT_LIMIT_200;
567 err = mmc_sd_switch(card, 1, 3, current_limit, status);
571 if (((status[15] >> 4) & 0x0F) != current_limit)
572 printk(KERN_WARNING "%s: Problem setting current limit!\n",
573 mmc_hostname(card->host));
579 * UHS-I specific initialization procedure
581 static int mmc_sd_init_uhs_card(struct mmc_card *card)
586 if (!card->scr.sda_spec3)
589 if (!(card->csd.cmdclass & CCC_SWITCH))
592 status = kmalloc(64, GFP_KERNEL);
594 printk(KERN_ERR "%s: could not allocate a buffer for "
595 "switch capabilities.\n", mmc_hostname(card->host));
599 /* Set 4-bit bus width */
600 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
601 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
602 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
606 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
609 /* Set the driver strength for the card */
610 err = sd_select_driver_type(card, status);
614 /* Set bus speed mode of the card */
615 err = sd_set_bus_speed_mode(card, status);
619 /* Set current limit for the card */
620 err = sd_set_current_limit(card, status);
624 /* SPI mode doesn't define CMD19 */
625 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
626 err = card->host->ops->execute_tuning(card->host);
634 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
635 card->raw_cid[2], card->raw_cid[3]);
636 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
637 card->raw_csd[2], card->raw_csd[3]);
638 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
639 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
640 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
641 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
642 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
643 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
644 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
645 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
646 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
647 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
650 static struct attribute *sd_std_attrs[] = {
655 &dev_attr_erase_size.attr,
656 &dev_attr_preferred_erase_size.attr,
657 &dev_attr_fwrev.attr,
658 &dev_attr_hwrev.attr,
659 &dev_attr_manfid.attr,
661 &dev_attr_oemid.attr,
662 &dev_attr_serial.attr,
666 static struct attribute_group sd_std_attr_group = {
667 .attrs = sd_std_attrs,
670 static const struct attribute_group *sd_attr_groups[] = {
675 struct device_type sd_type = {
676 .groups = sd_attr_groups,
680 * Fetch CID from card.
682 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
687 * Since we're changing the OCR value, we seem to
688 * need to tell some cards to go back to the idle
689 * state. We wait 1ms to give cards time to
695 * If SD_SEND_IF_COND indicates an SD 2.0
696 * compliant card and we should set bit 30
697 * of the ocr to indicate that we can handle
698 * block-addressed SDHC cards.
700 err = mmc_send_if_cond(host, ocr);
705 * If the host supports one of UHS-I modes, request the card
706 * to switch to 1.8V signaling level.
708 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
709 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
712 /* If the host can supply more than 150mA, XPC should be set to 1. */
713 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 |
714 MMC_CAP_SET_XPC_180))
718 err = mmc_send_app_op_cond(host, ocr, rocr);
723 * In case CCS and S18A in the response is set, start Signal Voltage
724 * Switch procedure. SPI mode doesn't support CMD11.
726 if (!mmc_host_is_spi(host) && rocr &&
727 ((*rocr & 0x41000000) == 0x41000000)) {
728 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
735 if (mmc_host_is_spi(host))
736 err = mmc_send_cid(host, cid);
738 err = mmc_all_send_cid(host, cid);
743 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
748 * Fetch CSD from card.
750 err = mmc_send_csd(card, card->raw_csd);
754 err = mmc_decode_csd(card);
761 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
768 * Fetch SCR from card.
770 err = mmc_app_send_scr(card, card->raw_scr);
774 err = mmc_decode_scr(card);
779 * Fetch and process SD Status register.
781 err = mmc_read_ssr(card);
785 /* Erase init depends on CSD and SSR */
786 mmc_init_erase(card);
789 * Fetch switch information from card.
791 err = mmc_read_switch(card);
797 * For SPI, enable CRC as appropriate.
798 * This CRC enable is located AFTER the reading of the
799 * card registers because some SDHC cards are not able
800 * to provide valid CRCs for non-512-byte blocks.
802 if (mmc_host_is_spi(host)) {
803 err = mmc_spi_set_crc(host, use_spi_crc);
809 * Check if read-only switch is active.
814 if (host->ops->get_ro)
815 ro = host->ops->get_ro(host);
818 printk(KERN_WARNING "%s: host does not "
819 "support reading read-only "
820 "switch. assuming write-enable.\n",
823 mmc_card_set_readonly(card);
830 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
832 unsigned max_dtr = (unsigned int)-1;
834 if (mmc_card_highspeed(card)) {
835 if (max_dtr > card->sw_caps.hs_max_dtr)
836 max_dtr = card->sw_caps.hs_max_dtr;
837 } else if (max_dtr > card->csd.max_dtr) {
838 max_dtr = card->csd.max_dtr;
844 void mmc_sd_go_highspeed(struct mmc_card *card)
846 mmc_card_set_highspeed(card);
847 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
851 * Handle the detection and initialisation of a card.
853 * In the case of a resume, "oldcard" will contain the card
854 * we're trying to reinitialise.
856 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
857 struct mmc_card *oldcard)
859 struct mmc_card *card;
865 WARN_ON(!host->claimed);
867 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
872 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
878 * Allocate card structure.
880 card = mmc_alloc_card(host, &sd_type);
882 return PTR_ERR(card);
884 card->type = MMC_TYPE_SD;
885 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
889 * For native busses: get card RCA and quit open drain mode.
891 if (!mmc_host_is_spi(host)) {
892 err = mmc_send_relative_addr(host, &card->rca);
896 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
900 err = mmc_sd_get_csd(host, card);
904 mmc_decode_cid(card);
908 * Select card, as all following commands rely on that.
910 if (!mmc_host_is_spi(host)) {
911 err = mmc_select_card(card);
916 err = mmc_sd_setup_card(host, card, oldcard != NULL);
920 /* Initialization sequence for UHS-I cards */
921 if (rocr & SD_ROCR_S18A) {
922 err = mmc_sd_init_uhs_card(card);
926 /* Card is an ultra-high-speed card */
927 mmc_sd_card_set_uhs(card);
930 * Since initialization is now complete, enable preset
931 * value registers for UHS-I cards.
933 if (host->ops->enable_preset_value)
934 host->ops->enable_preset_value(host, true);
937 * Attempt to change to high-speed (if supported)
939 err = mmc_sd_switch_hs(card);
941 mmc_sd_go_highspeed(card);
948 mmc_set_clock(host, mmc_sd_get_max_clock(card));
951 * Switch to wider bus (if supported).
953 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
954 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
955 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
959 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
968 mmc_remove_card(card);
974 * Host is being removed. Free up the current card.
976 static void mmc_sd_remove(struct mmc_host *host)
981 mmc_remove_card(host->card);
986 * Card detection callback from host.
988 static void mmc_sd_detect(struct mmc_host *host)
995 mmc_claim_host(host);
998 * Just check if our card has been removed.
1000 err = mmc_send_status(host->card, NULL);
1002 mmc_release_host(host);
1005 mmc_sd_remove(host);
1007 mmc_claim_host(host);
1008 mmc_detach_bus(host);
1009 mmc_release_host(host);
1014 * Suspend callback from host.
1016 static int mmc_sd_suspend(struct mmc_host *host)
1019 BUG_ON(!host->card);
1021 mmc_claim_host(host);
1022 if (!mmc_host_is_spi(host))
1023 mmc_deselect_cards(host);
1024 host->card->state &= ~MMC_STATE_HIGHSPEED;
1025 mmc_release_host(host);
1031 * Resume callback from host.
1033 * This function tries to determine if the same card is still present
1034 * and, if so, restore all state to it.
1036 static int mmc_sd_resume(struct mmc_host *host)
1041 BUG_ON(!host->card);
1043 mmc_claim_host(host);
1044 err = mmc_sd_init_card(host, host->ocr, host->card);
1045 mmc_release_host(host);
1050 static int mmc_sd_power_restore(struct mmc_host *host)
1054 host->card->state &= ~MMC_STATE_HIGHSPEED;
1055 mmc_claim_host(host);
1056 ret = mmc_sd_init_card(host, host->ocr, host->card);
1057 mmc_release_host(host);
1062 static const struct mmc_bus_ops mmc_sd_ops = {
1063 .remove = mmc_sd_remove,
1064 .detect = mmc_sd_detect,
1067 .power_restore = mmc_sd_power_restore,
1070 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1071 .remove = mmc_sd_remove,
1072 .detect = mmc_sd_detect,
1073 .suspend = mmc_sd_suspend,
1074 .resume = mmc_sd_resume,
1075 .power_restore = mmc_sd_power_restore,
1078 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1080 const struct mmc_bus_ops *bus_ops;
1082 if (!mmc_card_is_removable(host))
1083 bus_ops = &mmc_sd_ops_unsafe;
1085 bus_ops = &mmc_sd_ops;
1086 mmc_attach_bus(host, bus_ops);
1090 * Starting point for SD card init.
1092 int mmc_attach_sd(struct mmc_host *host)
1098 WARN_ON(!host->claimed);
1100 /* Make sure we are at 3.3V signalling voltage */
1101 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
1105 /* Disable preset value enable if already set since last time */
1106 if (host->ops->enable_preset_value)
1107 host->ops->enable_preset_value(host, false);
1109 err = mmc_send_app_op_cond(host, 0, &ocr);
1113 mmc_sd_attach_bus_ops(host);
1114 if (host->ocr_avail_sd)
1115 host->ocr_avail = host->ocr_avail_sd;
1118 * We need to get OCR a different way for SPI.
1120 if (mmc_host_is_spi(host)) {
1123 err = mmc_spi_read_ocr(host, 0, &ocr);
1129 * Sanity check the voltages that the card claims to
1133 printk(KERN_WARNING "%s: card claims to support voltages "
1134 "below the defined range. These will be ignored.\n",
1135 mmc_hostname(host));
1139 if ((ocr & MMC_VDD_165_195) &&
1140 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1141 printk(KERN_WARNING "%s: SD card claims to support the "
1142 "incompletely defined 'low voltage range'. This "
1143 "will be ignored.\n", mmc_hostname(host));
1144 ocr &= ~MMC_VDD_165_195;
1147 host->ocr = mmc_select_voltage(host, ocr);
1150 * Can we support the voltage(s) of the card(s)?
1158 * Detect and init the card.
1160 err = mmc_sd_init_card(host, host->ocr, NULL);
1164 mmc_release_host(host);
1165 err = mmc_add_card(host->card);
1166 mmc_claim_host(host);
1173 mmc_release_host(host);
1174 mmc_remove_card(host->card);
1176 mmc_claim_host(host);
1178 mmc_detach_bus(host);
1180 printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
1181 mmc_hostname(host), err);