Initial import

1 files changed, 1918 insertions, 0 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
new file mode 100644
index 000000000..f36c76f8b
--- /dev/null
+++ b/drivers/mmc/core/mmc.c
@@ -0,0 +1,1918 @@
+/*
+ *  linux/drivers/mmc/core/mmc.c
+ *
+ *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
+ *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
+ *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/pm_runtime.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/mmc.h>
+
+#include "core.h"
+#include "bus.h"
+#include "mmc_ops.h"
+#include "sd_ops.h"
+
+static const unsigned int tran_exp[] = {
+	10000,		100000,		1000000,	10000000,
+	0,		0,		0,		0
+};
+
+static const unsigned char tran_mant[] = {
+	0,	10,	12,	13,	15,	20,	25,	30,
+	35,	40,	45,	50,	55,	60,	70,	80,
+};
+
+static const unsigned int tacc_exp[] = {
+	1,	10,	100,	1000,	10000,	100000,	1000000, 10000000,
+};
+
+static const unsigned int tacc_mant[] = {
+	0,	10,	12,	13,	15,	20,	25,	30,
+	35,	40,	45,	50,	55,	60,	70,	80,
+};
+
+#define UNSTUFF_BITS(resp,start,size)					\
+	({								\
+		const int __size = size;				\
+		const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1;	\
+		const int __off = 3 - ((start) / 32);			\
+		const int __shft = (start) & 31;			\
+		u32 __res;						\
+									\
+		__res = resp[__off] >> __shft;				\
+		if (__size + __shft > 32)				\
+			__res |= resp[__off-1] << ((32 - __shft) % 32);	\
+		__res & __mask;						\
+	})
+
+/*
+ * Given the decoded CSD structure, decode the raw CID to our CID structure.
+ */
+static int mmc_decode_cid(struct mmc_card *card)
+{
+	u32 *resp = card->raw_cid;
+
+	/*
+	 * The selection of the format here is based upon published
+	 * specs from sandisk and from what people have reported.
+	 */
+	switch (card->csd.mmca_vsn) {
+	case 0: /* MMC v1.0 - v1.2 */
+	case 1: /* MMC v1.4 */
+		card->cid.manfid	= UNSTUFF_BITS(resp, 104, 24);
+		card->cid.prod_name[0]	= UNSTUFF_BITS(resp, 96, 8);
+		card->cid.prod_name[1]	= UNSTUFF_BITS(resp, 88, 8);
+		card->cid.prod_name[2]	= UNSTUFF_BITS(resp, 80, 8);
+		card->cid.prod_name[3]	= UNSTUFF_BITS(resp, 72, 8);
+		card->cid.prod_name[4]	= UNSTUFF_BITS(resp, 64, 8);
+		card->cid.prod_name[5]	= UNSTUFF_BITS(resp, 56, 8);
+		card->cid.prod_name[6]	= UNSTUFF_BITS(resp, 48, 8);
+		card->cid.hwrev		= UNSTUFF_BITS(resp, 44, 4);
+		card->cid.fwrev		= UNSTUFF_BITS(resp, 40, 4);
+		card->cid.serial	= UNSTUFF_BITS(resp, 16, 24);
+		card->cid.month		= UNSTUFF_BITS(resp, 12, 4);
+		card->cid.year		= UNSTUFF_BITS(resp, 8, 4) + 1997;
+		break;
+
+	case 2: /* MMC v2.0 - v2.2 */
+	case 3: /* MMC v3.1 - v3.3 */
+	case 4: /* MMC v4 */
+		card->cid.manfid	= UNSTUFF_BITS(resp, 120, 8);
+		card->cid.oemid		= UNSTUFF_BITS(resp, 104, 16);
+		card->cid.prod_name[0]	= UNSTUFF_BITS(resp, 96, 8);
+		card->cid.prod_name[1]	= UNSTUFF_BITS(resp, 88, 8);
+		card->cid.prod_name[2]	= UNSTUFF_BITS(resp, 80, 8);
+		card->cid.prod_name[3]	= UNSTUFF_BITS(resp, 72, 8);
+		card->cid.prod_name[4]	= UNSTUFF_BITS(resp, 64, 8);
+		card->cid.prod_name[5]	= UNSTUFF_BITS(resp, 56, 8);
+		card->cid.prv		= UNSTUFF_BITS(resp, 48, 8);
+		card->cid.serial	= UNSTUFF_BITS(resp, 16, 32);
+		card->cid.month		= UNSTUFF_BITS(resp, 12, 4);
+		card->cid.year		= UNSTUFF_BITS(resp, 8, 4) + 1997;
+		break;
+
+	default:
+		pr_err("%s: card has unknown MMCA version %d\n",
+			mmc_hostname(card->host), card->csd.mmca_vsn);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void mmc_set_erase_size(struct mmc_card *card)
+{
+	if (card->ext_csd.erase_group_def & 1)
+		card->erase_size = card->ext_csd.hc_erase_size;
+	else
+		card->erase_size = card->csd.erase_size;
+
+	mmc_init_erase(card);
+}
+
+/*
+ * Given a 128-bit response, decode to our card CSD structure.
+ */
+static int mmc_decode_csd(struct mmc_card *card)
+{
+	struct mmc_csd *csd = &card->csd;
+	unsigned int e, m, a, b;
+	u32 *resp = card->raw_csd;
+
+	/*
+	 * We only understand CSD structure v1.1 and v1.2.
+	 * v1.2 has extra information in bits 15, 11 and 10.
+	 * We also support eMMC v4.4 & v4.41.
+	 */
+	csd->structure = UNSTUFF_BITS(resp, 126, 2);
+	if (csd->structure == 0) {
+		pr_err("%s: unrecognised CSD structure version %d\n",
+			mmc_hostname(card->host), csd->structure);
+		return -EINVAL;
+	}
+
+	csd->mmca_vsn	 = UNSTUFF_BITS(resp, 122, 4);
+	m = UNSTUFF_BITS(resp, 115, 4);
+	e = UNSTUFF_BITS(resp, 112, 3);
+	csd->tacc_ns	 = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
+	csd->tacc_clks	 = UNSTUFF_BITS(resp, 104, 8) * 100;
+
+	m = UNSTUFF_BITS(resp, 99, 4);
+	e = UNSTUFF_BITS(resp, 96, 3);
+	csd->max_dtr	  = tran_exp[e] * tran_mant[m];
+	csd->cmdclass	  = UNSTUFF_BITS(resp, 84, 12);
+
+	e = UNSTUFF_BITS(resp, 47, 3);
+	m = UNSTUFF_BITS(resp, 62, 12);
+	csd->capacity	  = (1 + m) << (e + 2);
+
+	csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
+	csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
+	csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
+	csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
+	csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
+	csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
+	csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
+	csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
+
+	if (csd->write_blkbits >= 9) {
+		a = UNSTUFF_BITS(resp, 42, 5);
+		b = UNSTUFF_BITS(resp, 37, 5);
+		csd->erase_size = (a + 1) * (b + 1);
+		csd->erase_size <<= csd->write_blkbits - 9;
+	}
+
+	return 0;
+}
+
+static void mmc_select_card_type(struct mmc_card *card)
+{
+	struct mmc_host *host = card->host;
+	u8 card_type = card->ext_csd.raw_card_type;
+	u32 caps = host->caps, caps2 = host->caps2;
+	unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
+	unsigned int avail_type = 0;
+
+	if (caps & MMC_CAP_MMC_HIGHSPEED &&
+	    card_type & EXT_CSD_CARD_TYPE_HS_26) {
+		hs_max_dtr = MMC_HIGH_26_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_HS_26;
+	}
+
+	if (caps & MMC_CAP_MMC_HIGHSPEED &&
+	    card_type & EXT_CSD_CARD_TYPE_HS_52) {
+		hs_max_dtr = MMC_HIGH_52_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_HS_52;
+	}
+
+	if (caps & MMC_CAP_1_8V_DDR &&
+	    card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
+		hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
+	}
+
+	if (caps & MMC_CAP_1_2V_DDR &&
+	    card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
+		hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
+	}
+
+	if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
+	    card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
+		hs200_max_dtr = MMC_HS200_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
+	}
+
+	if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
+	    card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
+		hs200_max_dtr = MMC_HS200_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
+	}
+
+	if (caps2 & MMC_CAP2_HS400_1_8V &&
+	    card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
+		hs200_max_dtr = MMC_HS200_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
+	}
+
+	if (caps2 & MMC_CAP2_HS400_1_2V &&
+	    card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
+		hs200_max_dtr = MMC_HS200_MAX_DTR;
+		avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
+	}
+
+	card->ext_csd.hs_max_dtr = hs_max_dtr;
+	card->ext_csd.hs200_max_dtr = hs200_max_dtr;
+	card->mmc_avail_type = avail_type;
+}
+
+static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
+{
+	u8 hc_erase_grp_sz, hc_wp_grp_sz;
+
+	/*
+	 * Disable these attributes by default
+	 */
+	card->ext_csd.enhanced_area_offset = -EINVAL;
+	card->ext_csd.enhanced_area_size = -EINVAL;
+
+	/*
+	 * Enhanced area feature support -- check whether the eMMC
+	 * card has the Enhanced area enabled.  If so, export enhanced
+	 * area offset and size to user by adding sysfs interface.
+	 */
+	if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
+	    (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
+		if (card->ext_csd.partition_setting_completed) {
+			hc_erase_grp_sz =
+				ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
+			hc_wp_grp_sz =
+				ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
+
+			/*
+			 * calculate the enhanced data area offset, in bytes
+			 */
+			card->ext_csd.enhanced_area_offset =
+				(ext_csd[139] << 24) + (ext_csd[138] << 16) +
+				(ext_csd[137] << 8) + ext_csd[136];
+			if (mmc_card_blockaddr(card))
+				card->ext_csd.enhanced_area_offset <<= 9;
+			/*
+			 * calculate the enhanced data area size, in kilobytes
+			 */
+			card->ext_csd.enhanced_area_size =
+				(ext_csd[142] << 16) + (ext_csd[141] << 8) +
+				ext_csd[140];
+			card->ext_csd.enhanced_area_size *=
+				(size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
+			card->ext_csd.enhanced_area_size <<= 9;
+		} else {
+			pr_warn("%s: defines enhanced area without partition setting complete\n",
+				mmc_hostname(card->host));
+		}
+	}
+}
+
+static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
+{
+	int idx;
+	u8 hc_erase_grp_sz, hc_wp_grp_sz;
+	unsigned int part_size;
+
+	/*
+	 * General purpose partition feature support --
+	 * If ext_csd has the size of general purpose partitions,
+	 * set size, part_cfg, partition name in mmc_part.
+	 */
+	if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
+	    EXT_CSD_PART_SUPPORT_PART_EN) {
+		hc_erase_grp_sz =
+			ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
+		hc_wp_grp_sz =
+			ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
+
+		for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
+			if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
+			    !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
+			    !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
+				continue;
+			if (card->ext_csd.partition_setting_completed == 0) {
+				pr_warn("%s: has partition size defined without partition complete\n",
+					mmc_hostname(card->host));
+				break;
+			}
+			part_size =
+				(ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
+				<< 16) +
+				(ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
+				<< 8) +
+				ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
+			part_size *= (size_t)(hc_erase_grp_sz *
+				hc_wp_grp_sz);
+			mmc_part_add(card, part_size << 19,
+				EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
+				"gp%d", idx, false,
+				MMC_BLK_DATA_AREA_GP);
+		}
+	}
+}
+
+/*
+ * Decode extended CSD.
+ */
+static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
+{
+	int err = 0, idx;
+	unsigned int part_size;
+	struct device_node *np;
+	bool broken_hpi = false;
+
+	/* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
+	card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
+	if (card->csd.structure == 3) {
+		if (card->ext_csd.raw_ext_csd_structure > 2) {
+			pr_err("%s: unrecognised EXT_CSD structure "
+				"version %d\n", mmc_hostname(card->host),
+					card->ext_csd.raw_ext_csd_structure);
+			err = -EINVAL;
+			goto out;
+		}
+	}
+
+	np = mmc_of_find_child_device(card->host, 0);
+	if (np && of_device_is_compatible(np, "mmc-card"))
+		broken_hpi = of_property_read_bool(np, "broken-hpi");
+	of_node_put(np);
+
+	/*
+	 * The EXT_CSD format is meant to be forward compatible. As long
+	 * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
+	 * are authorized, see JEDEC JESD84-B50 section B.8.
+	 */
+	card->ext_csd.rev = ext_csd[EXT_CSD_REV];
+
+	card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
+	card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
+	card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
+	card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
+	if (card->ext_csd.rev >= 2) {
+		card->ext_csd.sectors =
+			ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
+			ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
+			ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
+			ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
+
+		/* Cards with density > 2GiB are sector addressed */
+		if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
+			mmc_card_set_blockaddr(card);
+	}
+
+	card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
+	mmc_select_card_type(card);
+
+	card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
+	card->ext_csd.raw_erase_timeout_mult =
+		ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
+	card->ext_csd.raw_hc_erase_grp_size =
+		ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
+	if (card->ext_csd.rev >= 3) {
+		u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
+		card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
+
+		/* EXT_CSD value is in units of 10ms, but we store in ms */
+		card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
+
+		/* Sleep / awake timeout in 100ns units */
+		if (sa_shift > 0 && sa_shift <= 0x17)
+			card->ext_csd.sa_timeout =
+					1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
+		card->ext_csd.erase_group_def =
+			ext_csd[EXT_CSD_ERASE_GROUP_DEF];
+		card->ext_csd.hc_erase_timeout = 300 *
+			ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
+		card->ext_csd.hc_erase_size =
+			ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
+
+		card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
+
+		/*
+		 * There are two boot regions of equal size, defined in
+		 * multiples of 128K.
+		 */
+		if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
+			for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
+				part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
+				mmc_part_add(card, part_size,
+					EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
+					"boot%d", idx, true,
+					MMC_BLK_DATA_AREA_BOOT);
+			}
+		}
+	}
+
+	card->ext_csd.raw_hc_erase_gap_size =
+		ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
+	card->ext_csd.raw_sec_trim_mult =
+		ext_csd[EXT_CSD_SEC_TRIM_MULT];
+	card->ext_csd.raw_sec_erase_mult =
+		ext_csd[EXT_CSD_SEC_ERASE_MULT];
+	card->ext_csd.raw_sec_feature_support =
+		ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
+	card->ext_csd.raw_trim_mult =
+		ext_csd[EXT_CSD_TRIM_MULT];
+	card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
+	if (card->ext_csd.rev >= 4) {
+		if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
+		    EXT_CSD_PART_SETTING_COMPLETED)
+			card->ext_csd.partition_setting_completed = 1;
+		else
+			card->ext_csd.partition_setting_completed = 0;
+
+		mmc_manage_enhanced_area(card, ext_csd);
+
+		mmc_manage_gp_partitions(card, ext_csd);
+
+		card->ext_csd.sec_trim_mult =
+			ext_csd[EXT_CSD_SEC_TRIM_MULT];
+		card->ext_csd.sec_erase_mult =
+			ext_csd[EXT_CSD_SEC_ERASE_MULT];
+		card->ext_csd.sec_feature_support =
+			ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
+		card->ext_csd.trim_timeout = 300 *
+			ext_csd[EXT_CSD_TRIM_MULT];
+
+		/*
+		 * Note that the call to mmc_part_add above defaults to read
+		 * only. If this default assumption is changed, the call must
+		 * take into account the value of boot_locked below.
+		 */
+		card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
+		card->ext_csd.boot_ro_lockable = true;
+
+		/* Save power class values */
+		card->ext_csd.raw_pwr_cl_52_195 =
+			ext_csd[EXT_CSD_PWR_CL_52_195];
+		card->ext_csd.raw_pwr_cl_26_195 =
+			ext_csd[EXT_CSD_PWR_CL_26_195];
+		card->ext_csd.raw_pwr_cl_52_360 =
+			ext_csd[EXT_CSD_PWR_CL_52_360];
+		card->ext_csd.raw_pwr_cl_26_360 =
+			ext_csd[EXT_CSD_PWR_CL_26_360];
+		card->ext_csd.raw_pwr_cl_200_195 =
+			ext_csd[EXT_CSD_PWR_CL_200_195];
+		card->ext_csd.raw_pwr_cl_200_360 =
+			ext_csd[EXT_CSD_PWR_CL_200_360];
+		card->ext_csd.raw_pwr_cl_ddr_52_195 =
+			ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
+		card->ext_csd.raw_pwr_cl_ddr_52_360 =
+			ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
+		card->ext_csd.raw_pwr_cl_ddr_200_360 =
+			ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
+	}
+
+	if (card->ext_csd.rev >= 5) {
+		/* Adjust production date as per JEDEC JESD84-B451 */
+		if (card->cid.year < 2010)
+			card->cid.year += 16;
+
+		/* check whether the eMMC card supports BKOPS */
+		if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
+			card->ext_csd.bkops = 1;
+			card->ext_csd.man_bkops_en =
+					(ext_csd[EXT_CSD_BKOPS_EN] &
+						EXT_CSD_MANUAL_BKOPS_MASK);
+			card->ext_csd.raw_bkops_status =
+				ext_csd[EXT_CSD_BKOPS_STATUS];
+			if (!card->ext_csd.man_bkops_en)
+				pr_info("%s: MAN_BKOPS_EN bit is not set\n",
+					mmc_hostname(card->host));
+		}
+
+		/* check whether the eMMC card supports HPI */
+		if (!broken_hpi && (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1)) {
+			card->ext_csd.hpi = 1;
+			if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
+				card->ext_csd.hpi_cmd =	MMC_STOP_TRANSMISSION;
+			else
+				card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
+			/*
+			 * Indicate the maximum timeout to close
+			 * a command interrupted by HPI
+			 */
+			card->ext_csd.out_of_int_time =
+				ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
+		}
+
+		card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
+		card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
+
+		/*
+		 * RPMB regions are defined in multiples of 128K.
+		 */
+		card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
+		if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
+			mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
+				EXT_CSD_PART_CONFIG_ACC_RPMB,
+				"rpmb", 0, false,
+				MMC_BLK_DATA_AREA_RPMB);
+		}
+	}
+
+	card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
+	if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
+		card->erased_byte = 0xFF;
+	else
+		card->erased_byte = 0x0;
+
+	/* eMMC v4.5 or later */
+	if (card->ext_csd.rev >= 6) {
+		card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
+
+		card->ext_csd.generic_cmd6_time = 10 *
+			ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
+		card->ext_csd.power_off_longtime = 10 *
+			ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
+
+		card->ext_csd.cache_size =
+			ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
+			ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
+			ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
+			ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
+
+		if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
+			card->ext_csd.data_sector_size = 4096;
+		else
+			card->ext_csd.data_sector_size = 512;
+
+		if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
+		    (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
+			card->ext_csd.data_tag_unit_size =
+			((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
+			(card->ext_csd.data_sector_size);
+		} else {
+			card->ext_csd.data_tag_unit_size = 0;
+		}
+
+		card->ext_csd.max_packed_writes =
+			ext_csd[EXT_CSD_MAX_PACKED_WRITES];
+		card->ext_csd.max_packed_reads =
+			ext_csd[EXT_CSD_MAX_PACKED_READS];
+	} else {
+		card->ext_csd.data_sector_size = 512;
+	}
+
+	/* eMMC v5 or later */
+	if (card->ext_csd.rev >= 7) {
+		memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
+		       MMC_FIRMWARE_LEN);
+		card->ext_csd.ffu_capable =
+			(ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
+			!(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
+	}
+out:
+	return err;
+}
+
+static int mmc_read_ext_csd(struct mmc_card *card)
+{
+	u8 *ext_csd;
+	int err;
+
+	if (!mmc_can_ext_csd(card))
+		return 0;
+
+	err = mmc_get_ext_csd(card, &ext_csd);
+	if (err) {
+		/* If the host or the card can't do the switch,
+		 * fail more gracefully. */
+		if ((err != -EINVAL)
+		 && (err != -ENOSYS)
+		 && (err != -EFAULT))
+			return err;
+
+		/*
+		 * High capacity cards should have this "magic" size
+		 * stored in their CSD.
+		 */
+		if (card->csd.capacity == (4096 * 512)) {
+			pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
+				mmc_hostname(card->host));
+		} else {
+			pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
+				mmc_hostname(card->host));
+			err = 0;
+		}
+
+		return err;
+	}
+
+	err = mmc_decode_ext_csd(card, ext_csd);
+	kfree(ext_csd);
+	return err;
+}
+
+static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
+{
+	u8 *bw_ext_csd;
+	int err;
+
+	if (bus_width == MMC_BUS_WIDTH_1)
+		return 0;
+
+	err = mmc_get_ext_csd(card, &bw_ext_csd);
+	if (err)
+		return err;
+
+	/* only compare read only fields */
+	err = !((card->ext_csd.raw_partition_support ==
+			bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
+		(card->ext_csd.raw_erased_mem_count ==
+			bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
+		(card->ext_csd.rev ==
+			bw_ext_csd[EXT_CSD_REV]) &&
+		(card->ext_csd.raw_ext_csd_structure ==
+			bw_ext_csd[EXT_CSD_STRUCTURE]) &&
+		(card->ext_csd.raw_card_type ==
+			bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
+		(card->ext_csd.raw_s_a_timeout ==
+			bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
+		(card->ext_csd.raw_hc_erase_gap_size ==
+			bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
+		(card->ext_csd.raw_erase_timeout_mult ==
+			bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
+		(card->ext_csd.raw_hc_erase_grp_size ==
+			bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
+		(card->ext_csd.raw_sec_trim_mult ==
+			bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
+		(card->ext_csd.raw_sec_erase_mult ==
+			bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
+		(card->ext_csd.raw_sec_feature_support ==
+			bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
+		(card->ext_csd.raw_trim_mult ==
+			bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
+		(card->ext_csd.raw_sectors[0] ==
+			bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
+		(card->ext_csd.raw_sectors[1] ==
+			bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
+		(card->ext_csd.raw_sectors[2] ==
+			bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
+		(card->ext_csd.raw_sectors[3] ==
+			bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
+		(card->ext_csd.raw_pwr_cl_52_195 ==
+			bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
+		(card->ext_csd.raw_pwr_cl_26_195 ==
+			bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
+		(card->ext_csd.raw_pwr_cl_52_360 ==
+			bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
+		(card->ext_csd.raw_pwr_cl_26_360 ==
+			bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
+		(card->ext_csd.raw_pwr_cl_200_195 ==
+			bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
+		(card->ext_csd.raw_pwr_cl_200_360 ==
+			bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
+		(card->ext_csd.raw_pwr_cl_ddr_52_195 ==
+			bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
+		(card->ext_csd.raw_pwr_cl_ddr_52_360 ==
+			bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
+		(card->ext_csd.raw_pwr_cl_ddr_200_360 ==
+			bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
+
+	if (err)
+		err = -EINVAL;
+
+	kfree(bw_ext_csd);
+	return err;
+}
+
+MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
+	card->raw_cid[2], card->raw_cid[3]);
+MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
+	card->raw_csd[2], card->raw_csd[3]);
+MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
+MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
+MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
+MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
+MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
+MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
+MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
+MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
+MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
+MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
+MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
+		card->ext_csd.enhanced_area_offset);
+MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
+MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
+MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
+
+static ssize_t mmc_fwrev_show(struct device *dev,
+			      struct device_attribute *attr,
+			      char *buf)
+{
+	struct mmc_card *card = mmc_dev_to_card(dev);
+
+	if (card->ext_csd.rev < 7) {
+		return sprintf(buf, "0x%x\n", card->cid.fwrev);
+	} else {
+		return sprintf(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
+			       card->ext_csd.fwrev);
+	}
+}
+
+static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
+
+static struct attribute *mmc_std_attrs[] = {
+	&dev_attr_cid.attr,
+	&dev_attr_csd.attr,
+	&dev_attr_date.attr,
+	&dev_attr_erase_size.attr,
+	&dev_attr_preferred_erase_size.attr,
+	&dev_attr_fwrev.attr,
+	&dev_attr_ffu_capable.attr,
+	&dev_attr_hwrev.attr,
+	&dev_attr_manfid.attr,
+	&dev_attr_name.attr,
+	&dev_attr_oemid.attr,
+	&dev_attr_prv.attr,
+	&dev_attr_serial.attr,
+	&dev_attr_enhanced_area_offset.attr,
+	&dev_attr_enhanced_area_size.attr,
+	&dev_attr_raw_rpmb_size_mult.attr,
+	&dev_attr_rel_sectors.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(mmc_std);
+
+static struct device_type mmc_type = {
+	.groups = mmc_std_groups,
+};
+
+/*
+ * Select the PowerClass for the current bus width
+ * If power class is defined for 4/8 bit bus in the
+ * extended CSD register, select it by executing the
+ * mmc_switch command.
+ */
+static int __mmc_select_powerclass(struct mmc_card *card,
+				   unsigned int bus_width)
+{
+	struct mmc_host *host = card->host;
+	struct mmc_ext_csd *ext_csd = &card->ext_csd;
+	unsigned int pwrclass_val = 0;
+	int err = 0;
+
+	switch (1 << host->ios.vdd) {
+	case MMC_VDD_165_195:
+		if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
+			pwrclass_val = ext_csd->raw_pwr_cl_26_195;
+		else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
+			pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
+				ext_csd->raw_pwr_cl_52_195 :
+				ext_csd->raw_pwr_cl_ddr_52_195;
+		else if (host->ios.clock <= MMC_HS200_MAX_DTR)
+			pwrclass_val = ext_csd->raw_pwr_cl_200_195;
+		break;
+	case MMC_VDD_27_28:
+	case MMC_VDD_28_29:
+	case MMC_VDD_29_30:
+	case MMC_VDD_30_31:
+	case MMC_VDD_31_32:
+	case MMC_VDD_32_33:
+	case MMC_VDD_33_34:
+	case MMC_VDD_34_35:
+	case MMC_VDD_35_36:
+		if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
+			pwrclass_val = ext_csd->raw_pwr_cl_26_360;
+		else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
+			pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
+				ext_csd->raw_pwr_cl_52_360 :
+				ext_csd->raw_pwr_cl_ddr_52_360;
+		else if (host->ios.clock <= MMC_HS200_MAX_DTR)
+			pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
+				ext_csd->raw_pwr_cl_ddr_200_360 :
+				ext_csd->raw_pwr_cl_200_360;
+		break;
+	default:
+		pr_warn("%s: Voltage range not supported for power class\n",
+			mmc_hostname(host));
+		return -EINVAL;
+	}
+
+	if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
+		pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
+				EXT_CSD_PWR_CL_8BIT_SHIFT;
+	else
+		pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
+				EXT_CSD_PWR_CL_4BIT_SHIFT;
+
+	/* If the power class is different from the default value */
+	if (pwrclass_val > 0) {
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				 EXT_CSD_POWER_CLASS,
+				 pwrclass_val,
+				 card->ext_csd.generic_cmd6_time);
+	}
+
+	return err;
+}
+
+static int mmc_select_powerclass(struct mmc_card *card)
+{
+	struct mmc_host *host = card->host;
+	u32 bus_width, ext_csd_bits;
+	int err, ddr;
+
+	/* Power class selection is supported for versions >= 4.0 */
+	if (!mmc_can_ext_csd(card))
+		return 0;
+
+	bus_width = host->ios.bus_width;
+	/* Power class values are defined only for 4/8 bit bus */
+	if (bus_width == MMC_BUS_WIDTH_1)
+		return 0;
+
+	ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
+	if (ddr)
+		ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
+			EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
+	else
+		ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
+			EXT_CSD_BUS_WIDTH_8 :  EXT_CSD_BUS_WIDTH_4;
+
+	err = __mmc_select_powerclass(card, ext_csd_bits);
+	if (err)
+		pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
+			mmc_hostname(host), 1 << bus_width, ddr);
+
+	return err;
+}
+
+/*
+ * Set the bus speed for the selected speed mode.
+ */
+static void mmc_set_bus_speed(struct mmc_card *card)
+{
+	unsigned int max_dtr = (unsigned int)-1;
+
+	if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
+	     max_dtr > card->ext_csd.hs200_max_dtr)
+		max_dtr = card->ext_csd.hs200_max_dtr;
+	else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
+		max_dtr = card->ext_csd.hs_max_dtr;
+	else if (max_dtr > card->csd.max_dtr)
+		max_dtr = card->csd.max_dtr;
+
+	mmc_set_clock(card->host, max_dtr);
+}
+
+/*
+ * Select the bus width amoung 4-bit and 8-bit(SDR).
+ * If the bus width is changed successfully, return the selected width value.
+ * Zero is returned instead of error value if the wide width is not supported.
+ */
+static int mmc_select_bus_width(struct mmc_card *card)
+{
+	static unsigned ext_csd_bits[] = {
+		EXT_CSD_BUS_WIDTH_8,
+		EXT_CSD_BUS_WIDTH_4,
+	};
+	static unsigned bus_widths[] = {
+		MMC_BUS_WIDTH_8,
+		MMC_BUS_WIDTH_4,
+	};
+	struct mmc_host *host = card->host;
+	unsigned idx, bus_width = 0;
+	int err = 0;
+
+	if (!mmc_can_ext_csd(card) ||
+	    !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
+		return 0;
+
+	idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
+
+	/*
+	 * Unlike SD, MMC cards dont have a configuration register to notify
+	 * supported bus width. So bus test command should be run to identify
+	 * the supported bus width or compare the ext csd values of current
+	 * bus width and ext csd values of 1 bit mode read earlier.
+	 */
+	for (; idx < ARRAY_SIZE(bus_widths); idx++) {
+		/*
+		 * Host is capable of 8bit transfer, then switch
+		 * the device to work in 8bit transfer mode. If the
+		 * mmc switch command returns error then switch to
+		 * 4bit transfer mode. On success set the corresponding
+		 * bus width on the host.
+		 */
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				 EXT_CSD_BUS_WIDTH,
+				 ext_csd_bits[idx],
+				 card->ext_csd.generic_cmd6_time);
+		if (err)
+			continue;
+
+		bus_width = bus_widths[idx];
+		mmc_set_bus_width(host, bus_width);
+
+		/*
+		 * If controller can't handle bus width test,
+		 * compare ext_csd previously read in 1 bit mode
+		 * against ext_csd at new bus width
+		 */
+		if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
+			err = mmc_compare_ext_csds(card, bus_width);
+		else
+			err = mmc_bus_test(card, bus_width);
+
+		if (!err) {
+			err = bus_width;
+			break;
+		} else {
+			pr_warn("%s: switch to bus width %d failed\n",
+				mmc_hostname(host), ext_csd_bits[idx]);
+		}
+	}
+
+	return err;
+}
+
+/*
+ * Switch to the high-speed mode
+ */
+static int mmc_select_hs(struct mmc_card *card)
+{
+	int err;
+
+	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			   EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
+			   card->ext_csd.generic_cmd6_time,
+			   true, true, true);
+	if (!err)
+		mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
+
+	return err;
+}
+
+/*
+ * Activate wide bus and DDR if supported.
+ */
+static int mmc_select_hs_ddr(struct mmc_card *card)
+{
+	struct mmc_host *host = card->host;
+	u32 bus_width, ext_csd_bits;
+	int err = 0;
+
+	if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
+		return 0;
+
+	bus_width = host->ios.bus_width;
+	if (bus_width == MMC_BUS_WIDTH_1)
+		return 0;
+
+	ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
+		EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
+
+	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			EXT_CSD_BUS_WIDTH,
+			ext_csd_bits,
+			card->ext_csd.generic_cmd6_time);
+	if (err) {
+		pr_err("%s: switch to bus width %d ddr failed\n",
+			mmc_hostname(host), 1 << bus_width);
+		return err;
+	}
+
+	/*
+	 * eMMC cards can support 3.3V to 1.2V i/o (vccq)
+	 * signaling.
+	 *
+	 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
+	 *
+	 * 1.8V vccq at 3.3V core voltage (vcc) is not required
+	 * in the JEDEC spec for DDR.
+	 *
+	 * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
+	 * host controller can support this, like some of the SDHCI
+	 * controller which connect to an eMMC device. Some of these
+	 * host controller still needs to use 1.8v vccq for supporting
+	 * DDR mode.
+	 *
+	 * So the sequence will be:
+	 * if (host and device can both support 1.2v IO)
+	 *	use 1.2v IO;
+	 * else if (host and device can both support 1.8v IO)
+	 *	use 1.8v IO;
+	 * so if host and device can only support 3.3v IO, this is the
+	 * last choice.
+	 *
+	 * WARNING: eMMC rules are NOT the same as SD DDR
+	 */
+	err = -EINVAL;
+	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
+		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
+
+	if (err && (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V))
+		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
+
+	/* make sure vccq is 3.3v after switching disaster */
+	if (err)
+		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
+
+	if (!err)
+		mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
+
+	return err;
+}
+
+static int mmc_select_hs400(struct mmc_card *card)
+{
+	struct mmc_host *host = card->host;
+	int err = 0;
+
+	/*
+	 * HS400 mode requires 8-bit bus width
+	 */
+	if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
+	      host->ios.bus_width == MMC_BUS_WIDTH_8))
+		return 0;
+
+	/*
+	 * Before switching to dual data rate operation for HS400,
+	 * it is required to convert from HS200 mode to HS mode.
+	 */
+	mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
+	mmc_set_bus_speed(card);
+
+	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			   EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
+			   card->ext_csd.generic_cmd6_time,
+			   true, true, true);
+	if (err) {
+		pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
+			mmc_hostname(host), err);
+		return err;
+	}
+
+	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			 EXT_CSD_BUS_WIDTH,
+			 EXT_CSD_DDR_BUS_WIDTH_8,
+			 card->ext_csd.generic_cmd6_time);
+	if (err) {
+		pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
+			mmc_hostname(host), err);
+		return err;
+	}
+
+	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			   EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS400,
+			   card->ext_csd.generic_cmd6_time,
+			   true, true, true);
+	if (err) {
+		pr_err("%s: switch to hs400 failed, err:%d\n",
+			 mmc_hostname(host), err);
+		return err;
+	}
+
+	mmc_set_timing(host, MMC_TIMING_MMC_HS400);
+	mmc_set_bus_speed(card);
+
+	return 0;
+}
+
+/*
+ * For device supporting HS200 mode, the following sequence
+ * should be done before executing the tuning process.
+ * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
+ * 2. switch to HS200 mode
+ * 3. set the clock to > 52Mhz and <=200MHz
+ */
+static int mmc_select_hs200(struct mmc_card *card)
+{
+	struct mmc_host *host = card->host;
+	int err = -EINVAL;
+
+	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
+		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
+
+	if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
+		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
+
+	/* If fails try again during next card power cycle */
+	if (err)
+		goto err;
+
+	/*
+	 * Set the bus width(4 or 8) with host's support and
+	 * switch to HS200 mode if bus width is set successfully.
+	 */
+	err = mmc_select_bus_width(card);
+	if (!IS_ERR_VALUE(err)) {
+		err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				   EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS200,
+				   card->ext_csd.generic_cmd6_time,
+				   true, true, true);
+		if (!err)
+			mmc_set_timing(host, MMC_TIMING_MMC_HS200);
+	}
+err:
+	return err;
+}
+
+/*
+ * Activate High Speed or HS200 mode if supported.
+ */
+static int mmc_select_timing(struct mmc_card *card)
+{
+	int err = 0;
+
+	if (!mmc_can_ext_csd(card))
+		goto bus_speed;
+
+	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
+		err = mmc_select_hs200(card);
+	else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
+		err = mmc_select_hs(card);
+
+	if (err && err != -EBADMSG)
+		return err;
+
+	if (err) {
+		pr_warn("%s: switch to %s failed\n",
+			mmc_card_hs(card) ? "high-speed" :
+			(mmc_card_hs200(card) ? "hs200" : ""),
+			mmc_hostname(card->host));
+		err = 0;
+	}
+
+bus_speed:
+	/*
+	 * Set the bus speed to the selected bus timing.
+	 * If timing is not selected, backward compatible is the default.
+	 */
+	mmc_set_bus_speed(card);
+	return err;
+}
+
+/*
+ * Execute tuning sequence to seek the proper bus operating
+ * conditions for HS200 and HS400, which sends CMD21 to the device.
+ */
+static int mmc_hs200_tuning(struct mmc_card *card)
+{
+	struct mmc_host *host = card->host;
+
+	/*
+	 * Timing should be adjusted to the HS400 target
+	 * operation frequency for tuning process
+	 */
+	if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
+	    host->ios.bus_width == MMC_BUS_WIDTH_8)
+		if (host->ops->prepare_hs400_tuning)
+			host->ops->prepare_hs400_tuning(host, &host->ios);
+
+	return mmc_execute_tuning(card);
+}
+
+/*
+ * Handle the detection and initialisation of a card.
+ *
+ * In the case of a resume, "oldcard" will contain the card
+ * we're trying to reinitialise.
+ */
+static int mmc_init_card(struct mmc_host *host, u32 ocr,
+	struct mmc_card *oldcard)
+{
+	struct mmc_card *card;
+	int err;
+	u32 cid[4];
+	u32 rocr;
+
+	BUG_ON(!host);
+	WARN_ON(!host->claimed);
+
+	/* Set correct bus mode for MMC before attempting init */
+	if (!mmc_host_is_spi(host))
+		mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
+
+	/*
+	 * Since we're changing the OCR value, we seem to
+	 * need to tell some cards to go back to the idle
+	 * state.  We wait 1ms to give cards time to
+	 * respond.
+	 * mmc_go_idle is needed for eMMC that are asleep
+	 */
+	mmc_go_idle(host);
+
+	/* The extra bit indicates that we support high capacity */
+	err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
+	if (err)
+		goto err;
+
+	/*
+	 * For SPI, enable CRC as appropriate.
+	 */
+	if (mmc_host_is_spi(host)) {
+		err = mmc_spi_set_crc(host, use_spi_crc);
+		if (err)
+			goto err;
+	}
+
+	/*
+	 * Fetch CID from card.
+	 */
+	if (mmc_host_is_spi(host))
+		err = mmc_send_cid(host, cid);
+	else
+		err = mmc_all_send_cid(host, cid);
+	if (err)
+		goto err;
+
+	if (oldcard) {
+		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
+			err = -ENOENT;
+			goto err;
+		}
+
+		card = oldcard;
+	} else {
+		/*
+		 * Allocate card structure.
+		 */
+		card = mmc_alloc_card(host, &mmc_type);
+		if (IS_ERR(card)) {
+			err = PTR_ERR(card);
+			goto err;
+		}
+
+		card->ocr = ocr;
+		card->type = MMC_TYPE_MMC;
+		card->rca = 1;
+		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
+	}
+
+	/*
+	 * Call the optional HC's init_card function to handle quirks.
+	 */
+	if (host->ops->init_card)
+		host->ops->init_card(host, card);
+
+	/*
+	 * For native busses:  set card RCA and quit open drain mode.
+	 */
+	if (!mmc_host_is_spi(host)) {
+		err = mmc_set_relative_addr(card);
+		if (err)
+			goto free_card;
+
+		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+	}
+
+	if (!oldcard) {
+		/*
+		 * Fetch CSD from card.
+		 */
+		err = mmc_send_csd(card, card->raw_csd);
+		if (err)
+			goto free_card;
+
+		err = mmc_decode_csd(card);
+		if (err)
+			goto free_card;
+		err = mmc_decode_cid(card);
+		if (err)
+			goto free_card;
+	}
+
+	/*
+	 * handling only for cards supporting DSR and hosts requesting
+	 * DSR configuration
+	 */
+	if (card->csd.dsr_imp && host->dsr_req)
+		mmc_set_dsr(host);
+
+	/*
+	 * Select card, as all following commands rely on that.
+	 */
+	if (!mmc_host_is_spi(host)) {
+		err = mmc_select_card(card);
+		if (err)
+			goto free_card;
+	}
+
+	if (!oldcard) {
+		/* Read extended CSD. */
+		err = mmc_read_ext_csd(card);
+		if (err)
+			goto free_card;
+
+		/* If doing byte addressing, check if required to do sector
+		 * addressing.  Handle the case of <2GB cards needing sector
+		 * addressing.  See section 8.1 JEDEC Standard JED84-A441;
+		 * ocr register has bit 30 set for sector addressing.
+		 */
+		if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
+			mmc_card_set_blockaddr(card);
+
+		/* Erase size depends on CSD and Extended CSD */
+		mmc_set_erase_size(card);
+	}
+
+	/*
+	 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
+	 * bit.  This bit will be lost every time after a reset or power off.
+	 */
+	if (card->ext_csd.partition_setting_completed ||
+	    (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				 EXT_CSD_ERASE_GROUP_DEF, 1,
+				 card->ext_csd.generic_cmd6_time);
+
+		if (err && err != -EBADMSG)
+			goto free_card;
+
+		if (err) {
+			err = 0;
+			/*
+			 * Just disable enhanced area off & sz
+			 * will try to enable ERASE_GROUP_DEF
+			 * during next time reinit
+			 */
+			card->ext_csd.enhanced_area_offset = -EINVAL;
+			card->ext_csd.enhanced_area_size = -EINVAL;
+		} else {
+			card->ext_csd.erase_group_def = 1;
+			/*
+			 * enable ERASE_GRP_DEF successfully.
+			 * This will affect the erase size, so
+			 * here need to reset erase size
+			 */
+			mmc_set_erase_size(card);
+		}
+	}
+
+	/*
+	 * Ensure eMMC user default partition is enabled
+	 */
+	if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
+		card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
+				 card->ext_csd.part_config,
+				 card->ext_csd.part_time);
+		if (err && err != -EBADMSG)
+			goto free_card;
+	}
+
+	/*
+	 * Enable power_off_notification byte in the ext_csd register
+	 */
+	if (card->ext_csd.rev >= 6) {
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				 EXT_CSD_POWER_OFF_NOTIFICATION,
+				 EXT_CSD_POWER_ON,
+				 card->ext_csd.generic_cmd6_time);
+		if (err && err != -EBADMSG)
+			goto free_card;
+
+		/*
+		 * The err can be -EBADMSG or 0,
+		 * so check for success and update the flag
+		 */
+		if (!err)
+			card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
+	}
+
+	/*
+	 * Select timing interface
+	 */
+	err = mmc_select_timing(card);
+	if (err)
+		goto free_card;
+
+	if (mmc_card_hs200(card)) {
+		err = mmc_hs200_tuning(card);
+		if (err)
+			goto free_card;
+
+		err = mmc_select_hs400(card);
+		if (err)
+			goto free_card;
+	} else if (mmc_card_hs(card)) {
+		/* Select the desired bus width optionally */
+		err = mmc_select_bus_width(card);
+		if (!IS_ERR_VALUE(err)) {
+			err = mmc_select_hs_ddr(card);
+			if (err)
+				goto free_card;
+		}
+	}
+
+	/*
+	 * Choose the power class with selected bus interface
+	 */
+	mmc_select_powerclass(card);
+
+	/*
+	 * Enable HPI feature (if supported)
+	 */
+	if (card->ext_csd.hpi) {
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				EXT_CSD_HPI_MGMT, 1,
+				card->ext_csd.generic_cmd6_time);
+		if (err && err != -EBADMSG)
+			goto free_card;
+		if (err) {
+			pr_warn("%s: Enabling HPI failed\n",
+				mmc_hostname(card->host));
+			err = 0;
+		} else
+			card->ext_csd.hpi_en = 1;
+	}
+
+	/*
+	 * If cache size is higher than 0, this indicates
+	 * the existence of cache and it can be turned on.
+	 */
+	if (card->ext_csd.cache_size > 0) {
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				EXT_CSD_CACHE_CTRL, 1,
+				card->ext_csd.generic_cmd6_time);
+		if (err && err != -EBADMSG)
+			goto free_card;
+
+		/*
+		 * Only if no error, cache is turned on successfully.
+		 */
+		if (err) {
+			pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
+				mmc_hostname(card->host), err);
+			card->ext_csd.cache_ctrl = 0;
+			err = 0;
+		} else {
+			card->ext_csd.cache_ctrl = 1;
+		}
+	}
+
+	/*
+	 * The mandatory minimum values are defined for packed command.
+	 * read: 5, write: 3
+	 */
+	if (card->ext_csd.max_packed_writes >= 3 &&
+	    card->ext_csd.max_packed_reads >= 5 &&
+	    host->caps2 & MMC_CAP2_PACKED_CMD) {
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				EXT_CSD_EXP_EVENTS_CTRL,
+				EXT_CSD_PACKED_EVENT_EN,
+				card->ext_csd.generic_cmd6_time);
+		if (err && err != -EBADMSG)
+			goto free_card;
+		if (err) {
+			pr_warn("%s: Enabling packed event failed\n",
+				mmc_hostname(card->host));
+			card->ext_csd.packed_event_en = 0;
+			err = 0;
+		} else {
+			card->ext_csd.packed_event_en = 1;
+		}
+	}
+
+	if (!oldcard)
+		host->card = card;
+
+	return 0;
+
+free_card:
+	if (!oldcard)
+		mmc_remove_card(card);
+err:
+	return err;
+}
+
+static int mmc_can_sleep(struct mmc_card *card)
+{
+	return (card && card->ext_csd.rev >= 3);
+}
+
+static int mmc_sleep(struct mmc_host *host)
+{
+	struct mmc_command cmd = {0};
+	struct mmc_card *card = host->card;
+	unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
+	int err;
+
+	err = mmc_deselect_cards(host);
+	if (err)
+		return err;
+
+	cmd.opcode = MMC_SLEEP_AWAKE;
+	cmd.arg = card->rca << 16;
+	cmd.arg |= 1 << 15;
+
+	/*
+	 * If the max_busy_timeout of the host is specified, validate it against
+	 * the sleep cmd timeout. A failure means we need to prevent the host
+	 * from doing hw busy detection, which is done by converting to a R1
+	 * response instead of a R1B.
+	 */
+	if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
+		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+	} else {
+		cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
+		cmd.busy_timeout = timeout_ms;
+	}
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err)
+		return err;
+
+	/*
+	 * If the host does not wait while the card signals busy, then we will
+	 * will have to wait the sleep/awake timeout.  Note, we cannot use the
+	 * SEND_STATUS command to poll the status because that command (and most
+	 * others) is invalid while the card sleeps.
+	 */
+	if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
+		mmc_delay(timeout_ms);
+
+	return err;
+}
+
+static int mmc_can_poweroff_notify(const struct mmc_card *card)
+{
+	return card &&
+		mmc_card_mmc(card) &&
+		(card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
+}
+
+static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
+{
+	unsigned int timeout = card->ext_csd.generic_cmd6_time;
+	int err;
+
+	/* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
+	if (notify_type == EXT_CSD_POWER_OFF_LONG)
+		timeout = card->ext_csd.power_off_longtime;
+
+	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			EXT_CSD_POWER_OFF_NOTIFICATION,
+			notify_type, timeout, true, false, false);
+	if (err)
+		pr_err("%s: Power Off Notification timed out, %u\n",
+		       mmc_hostname(card->host), timeout);
+
+	/* Disable the power off notification after the switch operation. */
+	card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
+
+	return err;
+}
+
+/*
+ * Host is being removed. Free up the current card.
+ */
+static void mmc_remove(struct mmc_host *host)
+{
+	BUG_ON(!host);
+	BUG_ON(!host->card);
+
+	mmc_remove_card(host->card);
+	host->card = NULL;
+}
+
+/*
+ * Card detection - card is alive.
+ */
+static int mmc_alive(struct mmc_host *host)
+{
+	return mmc_send_status(host->card, NULL);
+}
+
+/*
+ * Card detection callback from host.
+ */
+static void mmc_detect(struct mmc_host *host)
+{
+	int err;
+
+	BUG_ON(!host);
+	BUG_ON(!host->card);
+
+	mmc_get_card(host->card);
+
+	/*
+	 * Just check if our card has been removed.
+	 */
+	err = _mmc_detect_card_removed(host);
+
+	mmc_put_card(host->card);
+
+	if (err) {
+		mmc_remove(host);
+
+		mmc_claim_host(host);
+		mmc_detach_bus(host);
+		mmc_power_off(host);
+		mmc_release_host(host);
+	}
+}
+
+static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
+{
+	int err = 0;
+	unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
+					EXT_CSD_POWER_OFF_LONG;
+
+	BUG_ON(!host);
+	BUG_ON(!host->card);
+
+	mmc_claim_host(host);
+
+	if (mmc_card_suspended(host->card))
+		goto out;
+
+	if (mmc_card_doing_bkops(host->card)) {
+		err = mmc_stop_bkops(host->card);
+		if (err)
+			goto out;
+	}
+
+	err = mmc_flush_cache(host->card);
+	if (err)
+		goto out;
+
+	if (mmc_can_poweroff_notify(host->card) &&
+		((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
+		err = mmc_poweroff_notify(host->card, notify_type);
+	else if (mmc_can_sleep(host->card))
+		err = mmc_sleep(host);
+	else if (!mmc_host_is_spi(host))
+		err = mmc_deselect_cards(host);
+
+	if (!err) {
+		mmc_power_off(host);
+		mmc_card_set_suspended(host->card);
+	}
+out:
+	mmc_release_host(host);
+	return err;
+}
+
+/*
+ * Suspend callback
+ */
+static int mmc_suspend(struct mmc_host *host)
+{
+	int err;
+
+	err = _mmc_suspend(host, true);
+	if (!err) {
+		pm_runtime_disable(&host->card->dev);
+		pm_runtime_set_suspended(&host->card->dev);
+	}
+
+	return err;
+}
+
+/*
+ * This function tries to determine if the same card is still present
+ * and, if so, restore all state to it.
+ */
+static int _mmc_resume(struct mmc_host *host)
+{
+	int err = 0;
+
+	BUG_ON(!host);
+	BUG_ON(!host->card);
+
+	mmc_claim_host(host);
+
+	if (!mmc_card_suspended(host->card))
+		goto out;
+
+	mmc_power_up(host, host->card->ocr);
+	err = mmc_init_card(host, host->card->ocr, host->card);
+	mmc_card_clr_suspended(host->card);
+
+out:
+	mmc_release_host(host);
+	return err;
+}
+
+/*
+ * Shutdown callback
+ */
+static int mmc_shutdown(struct mmc_host *host)
+{
+	int err = 0;
+
+	/*
+	 * In a specific case for poweroff notify, we need to resume the card
+	 * before we can shutdown it properly.
+	 */
+	if (mmc_can_poweroff_notify(host->card) &&
+		!(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
+		err = _mmc_resume(host);
+
+	if (!err)
+		err = _mmc_suspend(host, false);
+
+	return err;
+}
+
+/*
+ * Callback for resume.
+ */
+static int mmc_resume(struct mmc_host *host)
+{
+	int err = 0;
+
+	if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
+		err = _mmc_resume(host);
+		pm_runtime_set_active(&host->card->dev);
+		pm_runtime_mark_last_busy(&host->card->dev);
+	}
+	pm_runtime_enable(&host->card->dev);
+
+	return err;
+}
+
+/*
+ * Callback for runtime_suspend.
+ */
+static int mmc_runtime_suspend(struct mmc_host *host)
+{
+	int err;
+
+	if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
+		return 0;
+
+	err = _mmc_suspend(host, true);
+	if (err)
+		pr_err("%s: error %d doing aggressive suspend\n",
+			mmc_hostname(host), err);
+
+	return err;
+}
+
+/*
+ * Callback for runtime_resume.
+ */
+static int mmc_runtime_resume(struct mmc_host *host)
+{
+	int err;
+
+	if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
+		return 0;
+
+	err = _mmc_resume(host);
+	if (err)
+		pr_err("%s: error %d doing aggressive resume\n",
+			mmc_hostname(host), err);
+
+	return 0;
+}
+
+static int mmc_power_restore(struct mmc_host *host)
+{
+	int ret;
+
+	mmc_claim_host(host);
+	ret = mmc_init_card(host, host->card->ocr, host->card);
+	mmc_release_host(host);
+
+	return ret;
+}
+
+int mmc_can_reset(struct mmc_card *card)
+{
+	u8 rst_n_function;
+
+	rst_n_function = card->ext_csd.rst_n_function;
+	if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
+		return 0;
+	return 1;
+}
+EXPORT_SYMBOL(mmc_can_reset);
+
+static int mmc_reset(struct mmc_host *host)
+{
+	struct mmc_card *card = host->card;
+	u32 status;
+
+	if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
+		return -EOPNOTSUPP;
+
+	if (!mmc_can_reset(card))
+		return -EOPNOTSUPP;
+
+	mmc_host_clk_hold(host);
+	mmc_set_clock(host, host->f_init);
+
+	host->ops->hw_reset(host);
+
+	/* If the reset has happened, then a status command will fail */
+	if (!mmc_send_status(card, &status)) {
+		mmc_host_clk_release(host);
+		return -ENOSYS;
+	}
+
+	/* Set initial state and call mmc_set_ios */
+	mmc_set_initial_state(host);
+	mmc_host_clk_release(host);
+
+	return mmc_power_restore(host);
+}
+
+static const struct mmc_bus_ops mmc_ops = {
+	.remove = mmc_remove,
+	.detect = mmc_detect,
+	.suspend = mmc_suspend,
+	.resume = mmc_resume,
+	.runtime_suspend = mmc_runtime_suspend,
+	.runtime_resume = mmc_runtime_resume,
+	.power_restore = mmc_power_restore,
+	.alive = mmc_alive,
+	.shutdown = mmc_shutdown,
+	.reset = mmc_reset,
+};
+
+/*
+ * Starting point for MMC card init.
+ */
+int mmc_attach_mmc(struct mmc_host *host)
+{
+	int err;
+	u32 ocr, rocr;
+
+	BUG_ON(!host);
+	WARN_ON(!host->claimed);
+
+	/* Set correct bus mode for MMC before attempting attach */
+	if (!mmc_host_is_spi(host))
+		mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
+
+	err = mmc_send_op_cond(host, 0, &ocr);
+	if (err)
+		return err;
+
+	mmc_attach_bus(host, &mmc_ops);
+	if (host->ocr_avail_mmc)
+		host->ocr_avail = host->ocr_avail_mmc;
+
+	/*
+	 * We need to get OCR a different way for SPI.
+	 */
+	if (mmc_host_is_spi(host)) {
+		err = mmc_spi_read_ocr(host, 1, &ocr);
+		if (err)
+			goto err;
+	}
+
+	rocr = mmc_select_voltage(host, ocr);
+
+	/*
+	 * Can we support the voltage of the card?
+	 */
+	if (!rocr) {
+		err = -EINVAL;
+		goto err;
+	}
+
+	/*
+	 * Detect and init the card.
+	 */
+	err = mmc_init_card(host, rocr, NULL);
+	if (err)
+		goto err;
+
+	mmc_release_host(host);
+	err = mmc_add_card(host->card);
+	mmc_claim_host(host);
+	if (err)
+		goto remove_card;
+
+	return 0;
+
+remove_card:
+	mmc_release_host(host);
+	mmc_remove_card(host->card);
+	mmc_claim_host(host);
+	host->card = NULL;
+err:
+	mmc_detach_bus(host);
+
+	pr_err("%s: error %d whilst initialising MMC card\n",
+		mmc_hostname(host), err);
+
+	return err;
+}