text: /*
   *  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 "host.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 =
  				(((unsigned long long)ext_csd[139]) << 24) +
  				(((unsigned long long)ext_csd[138]) << 16) +
  				(((unsigned long long)ext_csd[137]) << 8) +
  				(((unsigned long long)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);
  		}
  	}
  }
  
  /* Minimum partition switch timeout in milliseconds */
  #define MMC_MIN_PART_SWITCH_TIME	300
  
  /*
   * 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];
  		/* Some eMMC set the value too low so set a minimum */
  		if (card->ext_csd.part_time &&
  		    card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
  			card->ext_csd.part_time = MMC_MIN_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];
  	card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
  	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;
  }
  
  /* Caller must hold re-tuning */
  static int mmc_switch_status(struct mmc_card *card)
  {
  	u32 status;
  	int err;
  
  	err = mmc_send_status(card, &status);
  	if (err)
  		return err;
  
  	return mmc_switch_status_error(card->host, status);
  }
  
  static int mmc_select_hs400(struct mmc_card *card)
  {
  	struct mmc_host *host = card->host;
  	bool send_status = true;
  	unsigned int max_dtr;
  	int err = 0;
  	u8 val;
  
  	/*
  	 * 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;
  
  	if (host->caps & MMC_CAP_WAIT_WHILE_BUSY)
  		send_status = false;
  
  	/* Reduce frequency to HS frequency */
  	max_dtr = card->ext_csd.hs_max_dtr;
  	mmc_set_clock(host, max_dtr);
  
  	/* Switch card to HS mode */
  	val = EXT_CSD_TIMING_HS;
  	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
  			   EXT_CSD_HS_TIMING, val,
  			   card->ext_csd.generic_cmd6_time,
  			   true, send_status, true);
  	if (err) {
  		pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
  			mmc_hostname(host), err);
  		return err;
  	}
  
  	/* Set host controller to HS timing */
  	mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
  
  	if (!send_status) {
  		err = mmc_switch_status(card);
  		if (err)
  			goto out_err;
  	}
  
  	/* Switch card to DDR */
  	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;
  	}
  
  	/* Switch card to HS400 */
  	val = EXT_CSD_TIMING_HS400 |
  	      card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
  	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
  			   EXT_CSD_HS_TIMING, val,
  			   card->ext_csd.generic_cmd6_time,
  			   true, send_status, true);
  	if (err) {
  		pr_err("%s: switch to hs400 failed, err:%d\n",
  			 mmc_hostname(host), err);
  		return err;
  	}
  
  	/* Set host controller to HS400 timing and frequency */
  	mmc_set_timing(host, MMC_TIMING_MMC_HS400);
  	mmc_set_bus_speed(card);
  
  	if (!send_status) {
  		err = mmc_switch_status(card);
  		if (err)
  			goto out_err;
  	}
  
  	return 0;
  
  out_err:
  	pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
  	       __func__, err);
  	return err;
  }
  
  int mmc_hs200_to_hs400(struct mmc_card *card)
  {
  	return mmc_select_hs400(card);
  }
  
  int mmc_hs400_to_hs200(struct mmc_card *card)
  {
  	struct mmc_host *host = card->host;
  	bool send_status = true;
  	unsigned int max_dtr;
  	int err;
  	u8 val;
  
  	if (host->caps & MMC_CAP_WAIT_WHILE_BUSY)
  		send_status = false;
  
  	/* Reduce frequency to HS */
  	max_dtr = card->ext_csd.hs_max_dtr;
  	mmc_set_clock(host, max_dtr);
  
  	/* Switch HS400 to HS DDR */
  	val = EXT_CSD_TIMING_HS;
  	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
  			   val, card->ext_csd.generic_cmd6_time,
  			   true, send_status, true);
  	if (err)
  		goto out_err;
  
  	mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
  
  	if (!send_status) {
  		err = mmc_switch_status(card);
  		if (err)
  			goto out_err;
  	}
  
  	/* Switch HS DDR to HS */
  	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
  			   EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
  			   true, send_status, true);
  	if (err)
  		goto out_err;
  
  	mmc_set_timing(host, MMC_TIMING_MMC_HS);
  
  	if (!send_status) {
  		err = mmc_switch_status(card);
  		if (err)
  			goto out_err;
  	}
  
  	/* Switch HS to HS200 */
  	val = EXT_CSD_TIMING_HS200 |
  	      card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
  	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
  			   val, card->ext_csd.generic_cmd6_time, true,
  			   send_status, true);
  	if (err)
  		goto out_err;
  
  	mmc_set_timing(host, MMC_TIMING_MMC_HS200);
  
  	if (!send_status) {
  		err = mmc_switch_status(card);
  		if (err)
  			goto out_err;
  	}
  
  	mmc_set_bus_speed(card);
  
  	return 0;
  
  out_err:
  	pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
  	       __func__, err);
  	return err;
  }
  
  static void mmc_select_driver_type(struct mmc_card *card)
  {
  	int card_drv_type, drive_strength, drv_type;
  
  	card_drv_type = card->ext_csd.raw_driver_strength |
  			mmc_driver_type_mask(0);
  
  	drive_strength = mmc_select_drive_strength(card,
  						   card->ext_csd.hs200_max_dtr,
  						   card_drv_type, &drv_type);
  
  	card->drive_strength = drive_strength;
  
  	if (drv_type)
  		mmc_set_driver_type(card->host, drv_type);
  }
  
  /*
   * 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;
  	bool send_status = true;
  	unsigned int old_timing;
  	int err = -EINVAL;
  	u8 val;
  
  	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;
  
  	mmc_select_driver_type(card);
  
  	if (host->caps & MMC_CAP_WAIT_WHILE_BUSY)
  		send_status = false;
  
  	/*
  	 * 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)) {
  		val = EXT_CSD_TIMING_HS200 |
  		      card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
  		err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
  				   EXT_CSD_HS_TIMING, val,
  				   card->ext_csd.generic_cmd6_time,
  				   true, send_status, true);
  		if (err)
  			goto err;
  		old_timing = host->ios.timing;
  		mmc_set_timing(host, MMC_TIMING_MMC_HS200);
  		if (!send_status) {
  			err = mmc_switch_status(card);
  			/*
  			 * mmc_select_timing() assumes timing has not changed if
  			 * it is a switch error.
  			 */
  			if (err == -EBADMSG)
  				mmc_set_timing(host, old_timing);
  		}
  	}
  err:
  	if (err)
  		pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
  		       __func__, 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;
  
  	/* Re-tuning can't be done once the card is deselected */
  	mmc_retune_hold(host);
  
  	err = mmc_deselect_cards(host);
  	if (err)
  		goto out_release;
  
  	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)
  		goto out_release;
  
  	/*
  	 * 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);
  
  out_release:
  	mmc_retune_release(host);
  	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;
  }
  
  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;
  
  	if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
  		return -EOPNOTSUPP;
  
  	if (!mmc_can_reset(card))
  		return -EOPNOTSUPP;
  
  	mmc_set_clock(host, host->f_init);
  
  	host->ops->hw_reset(host);
  
  	/* Set initial state and call mmc_set_ios */
  	mmc_set_initial_state(host);
  
  	return mmc_init_card(host, card->ocr, card);
  }
  
  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,
  	.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);
  	if (err)
  		goto remove_card;
  
  	mmc_claim_host(host);
  	return 0;
  
  remove_card:
  	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;
  }
  