sd.c 26.7 KB
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/*
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 *  linux/drivers/mmc/core/sd.c
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 *
 *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
 *  SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
 *  Copyright (C) 2005-2007 Pierre Ossman, 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>
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#include <linux/slab.h>
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#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
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#include <linux/mmc/sd.h>
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#include "core.h"
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#include "bus.h"
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#include "mmc_ops.h"
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#include "sd.h"
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#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.
 */
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void mmc_decode_cid(struct mmc_card *card)
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{
	u32 *resp = card->raw_cid;

	memset(&card->cid, 0, sizeof(struct mmc_cid));

	/*
	 * SD doesn't currently have a version field so we will
	 * have to assume we can parse this.
	 */
	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.hwrev			= UNSTUFF_BITS(resp, 60, 4);
	card->cid.fwrev			= UNSTUFF_BITS(resp, 56, 4);
	card->cid.serial		= UNSTUFF_BITS(resp, 24, 32);
	card->cid.year			= UNSTUFF_BITS(resp, 12, 8);
	card->cid.month			= UNSTUFF_BITS(resp, 8, 4);

	card->cid.year += 2000; /* SD cards year offset */
}

/*
 * Given a 128-bit response, decode to our card CSD structure.
 */
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static int mmc_decode_csd(struct mmc_card *card)
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{
	struct mmc_csd *csd = &card->csd;
	unsigned int e, m, csd_struct;
	u32 *resp = card->raw_csd;

	csd_struct = UNSTUFF_BITS(resp, 126, 2);

	switch (csd_struct) {
	case 0:
		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->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
		csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
		csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
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		if (UNSTUFF_BITS(resp, 46, 1)) {
			csd->erase_size = 1;
		} else if (csd->write_blkbits >= 9) {
			csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
			csd->erase_size <<= csd->write_blkbits - 9;
		}
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		break;
	case 1:
		/*
		 * This is a block-addressed SDHC card. Most
		 * interesting fields are unused and have fixed
		 * values. To avoid getting tripped by buggy cards,
		 * we assume those fixed values ourselves.
		 */
		mmc_card_set_blockaddr(card);

		csd->tacc_ns	 = 0; /* Unused */
		csd->tacc_clks	 = 0; /* Unused */

		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);

		m = UNSTUFF_BITS(resp, 48, 22);
		csd->capacity     = (1 + m) << 10;

		csd->read_blkbits = 9;
		csd->read_partial = 0;
		csd->write_misalign = 0;
		csd->read_misalign = 0;
		csd->r2w_factor = 4; /* Unused */
		csd->write_blkbits = 9;
		csd->write_partial = 0;
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		csd->erase_size = 1;
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		break;
	default:
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		printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
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			mmc_hostname(card->host), csd_struct);
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		return -EINVAL;
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	}
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	card->erase_size = csd->erase_size;

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	return 0;
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}

/*
 * Given a 64-bit response, decode to our card SCR structure.
 */
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static int mmc_decode_scr(struct mmc_card *card)
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{
	struct sd_scr *scr = &card->scr;
	unsigned int scr_struct;
	u32 resp[4];

	resp[3] = card->raw_scr[1];
	resp[2] = card->raw_scr[0];

	scr_struct = UNSTUFF_BITS(resp, 60, 4);
	if (scr_struct != 0) {
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		printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
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			mmc_hostname(card->host), scr_struct);
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		return -EINVAL;
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	}

	scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
	scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
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	if (scr->sda_vsn == SCR_SPEC_VER_2)
		/* Check if Physical Layer Spec v3.0 is supported */
		scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
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	if (UNSTUFF_BITS(resp, 55, 1))
		card->erased_byte = 0xFF;
	else
		card->erased_byte = 0x0;

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	return 0;
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}

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/*
 * Fetch and process SD Status register.
 */
static int mmc_read_ssr(struct mmc_card *card)
{
	unsigned int au, es, et, eo;
	int err, i;
	u32 *ssr;

	if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
		printk(KERN_WARNING "%s: card lacks mandatory SD Status "
			"function.\n", mmc_hostname(card->host));
		return 0;
	}

	ssr = kmalloc(64, GFP_KERNEL);
	if (!ssr)
		return -ENOMEM;

	err = mmc_app_sd_status(card, ssr);
	if (err) {
		printk(KERN_WARNING "%s: problem reading SD Status "
			"register.\n", mmc_hostname(card->host));
		err = 0;
		goto out;
	}

	for (i = 0; i < 16; i++)
		ssr[i] = be32_to_cpu(ssr[i]);

	/*
	 * UNSTUFF_BITS only works with four u32s so we have to offset the
	 * bitfield positions accordingly.
	 */
	au = UNSTUFF_BITS(ssr, 428 - 384, 4);
	if (au > 0 || au <= 9) {
		card->ssr.au = 1 << (au + 4);
		es = UNSTUFF_BITS(ssr, 408 - 384, 16);
		et = UNSTUFF_BITS(ssr, 402 - 384, 6);
		eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
		if (es && et) {
			card->ssr.erase_timeout = (et * 1000) / es;
			card->ssr.erase_offset = eo * 1000;
		}
	} else {
		printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit "
			"size.\n", mmc_hostname(card->host));
	}
out:
	kfree(ssr);
	return err;
}

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/*
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 * Fetches and decodes switch information
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 */
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static int mmc_read_switch(struct mmc_card *card)
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{
	int err;
	u8 *status;

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	if (card->scr.sda_vsn < SCR_SPEC_VER_1)
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		return 0;
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	if (!(card->csd.cmdclass & CCC_SWITCH)) {
		printk(KERN_WARNING "%s: card lacks mandatory switch "
			"function, performance might suffer.\n",
			mmc_hostname(card->host));
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		return 0;
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	}

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	err = -EIO;
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	status = kmalloc(64, GFP_KERNEL);
	if (!status) {
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		printk(KERN_ERR "%s: could not allocate a buffer for "
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			"switch capabilities.\n",
			mmc_hostname(card->host));
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		return -ENOMEM;
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	}

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	/* Find out the supported Bus Speed Modes. */
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	err = mmc_sd_switch(card, 0, 0, 1, status);
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	if (err) {
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		/*
		 * If the host or the card can't do the switch,
		 * fail more gracefully.
		 */
		if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
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			goto out;

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		printk(KERN_WARNING "%s: problem reading Bus Speed modes.\n",
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			mmc_hostname(card->host));
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		err = 0;
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		goto out;
	}

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	if (card->scr.sda_spec3) {
		card->sw_caps.sd3_bus_mode = status[13];

		/* Find out Driver Strengths supported by the card */
		err = mmc_sd_switch(card, 0, 2, 1, status);
		if (err) {
			/*
			 * If the host or the card can't do the switch,
			 * fail more gracefully.
			 */
			if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
				goto out;

			printk(KERN_WARNING "%s: problem reading "
				"Driver Strength.\n",
				mmc_hostname(card->host));
			err = 0;

			goto out;
		}

		card->sw_caps.sd3_drv_type = status[9];

		/* Find out Current Limits supported by the card */
		err = mmc_sd_switch(card, 0, 3, 1, status);
		if (err) {
			/*
			 * If the host or the card can't do the switch,
			 * fail more gracefully.
			 */
			if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
				goto out;

			printk(KERN_WARNING "%s: problem reading "
				"Current Limit.\n",
				mmc_hostname(card->host));
			err = 0;

			goto out;
		}

		card->sw_caps.sd3_curr_limit = status[7];
	} else {
		if (status[13] & 0x02)
			card->sw_caps.hs_max_dtr = 50000000;
	}
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out:
	kfree(status);

	return err;
}

/*
 * Test if the card supports high-speed mode and, if so, switch to it.
 */
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int mmc_sd_switch_hs(struct mmc_card *card)
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{
	int err;
	u8 *status;

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	if (card->scr.sda_vsn < SCR_SPEC_VER_1)
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		return 0;
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	if (!(card->csd.cmdclass & CCC_SWITCH))
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		return 0;
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	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
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		return 0;
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	if (card->sw_caps.hs_max_dtr == 0)
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		return 0;
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	err = -EIO;
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	status = kmalloc(64, GFP_KERNEL);
	if (!status) {
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		printk(KERN_ERR "%s: could not allocate a buffer for "
			"switch capabilities.\n", mmc_hostname(card->host));
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		return -ENOMEM;
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	}

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	err = mmc_sd_switch(card, 1, 0, 1, status);
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	if (err)
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		goto out;

	if ((status[16] & 0xF) != 1) {
		printk(KERN_WARNING "%s: Problem switching card "
			"into high-speed mode!\n",
			mmc_hostname(card->host));
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		err = 0;
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	} else {
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		err = 1;
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	}

out:
	kfree(status);

	return err;
}

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static int sd_select_driver_type(struct mmc_card *card, u8 *status)
{
	int host_drv_type = 0, card_drv_type = 0;
	int err;

	/*
	 * If the host doesn't support any of the Driver Types A,C or D,
	 * default Driver Type B is used.
	 */
	if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
	    | MMC_CAP_DRIVER_TYPE_D)))
		return 0;

	if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) {
		host_drv_type = MMC_SET_DRIVER_TYPE_A;
		if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
			card_drv_type = MMC_SET_DRIVER_TYPE_A;
		else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_B)
			card_drv_type = MMC_SET_DRIVER_TYPE_B;
		else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
			card_drv_type = MMC_SET_DRIVER_TYPE_C;
	} else if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) {
		host_drv_type = MMC_SET_DRIVER_TYPE_C;
		if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
			card_drv_type = MMC_SET_DRIVER_TYPE_C;
	} else if (!(card->host->caps & MMC_CAP_DRIVER_TYPE_D)) {
		/*
		 * If we are here, that means only the default driver type
		 * B is supported by the host.
		 */
		host_drv_type = MMC_SET_DRIVER_TYPE_B;
		if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_B)
			card_drv_type = MMC_SET_DRIVER_TYPE_B;
		else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
			card_drv_type = MMC_SET_DRIVER_TYPE_C;
	}

	err = mmc_sd_switch(card, 1, 2, card_drv_type, status);
	if (err)
		return err;

	if ((status[15] & 0xF) != card_drv_type) {
		printk(KERN_WARNING "%s: Problem setting driver strength!\n",
			mmc_hostname(card->host));
		return 0;
	}

	mmc_set_driver_type(card->host, host_drv_type);

	return 0;
}

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static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
{
	unsigned int bus_speed = 0, timing = 0;
	int err;

	/*
	 * If the host doesn't support any of the UHS-I modes, fallback on
	 * default speed.
	 */
	if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
	    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
		return 0;

	if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
	    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
			bus_speed = UHS_SDR104_BUS_SPEED;
			timing = MMC_TIMING_UHS_SDR104;
			card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
	} else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
			bus_speed = UHS_DDR50_BUS_SPEED;
			timing = MMC_TIMING_UHS_DDR50;
			card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
		    MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
		    SD_MODE_UHS_SDR50)) {
			bus_speed = UHS_SDR50_BUS_SPEED;
			timing = MMC_TIMING_UHS_SDR50;
			card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
		    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
			bus_speed = UHS_SDR25_BUS_SPEED;
			timing = MMC_TIMING_UHS_SDR25;
			card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
		    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
		    MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
		    SD_MODE_UHS_SDR12)) {
			bus_speed = UHS_SDR12_BUS_SPEED;
			timing = MMC_TIMING_UHS_SDR12;
			card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
	}

	card->sd_bus_speed = bus_speed;
	err = mmc_sd_switch(card, 1, 0, bus_speed, status);
	if (err)
		return err;

	if ((status[16] & 0xF) != bus_speed)
		printk(KERN_WARNING "%s: Problem setting bus speed mode!\n",
			mmc_hostname(card->host));
	else {
		mmc_set_timing(card->host, timing);
		mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
	}

	return 0;
}

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static int sd_set_current_limit(struct mmc_card *card, u8 *status)
{
	int current_limit = 0;
	int err;

	/*
	 * Current limit switch is only defined for SDR50, SDR104, and DDR50
	 * bus speed modes. For other bus speed modes, we set the default
	 * current limit of 200mA.
	 */
	if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
	    (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
	    (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) {
		if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
			if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
				current_limit = SD_SET_CURRENT_LIMIT_800;
			else if (card->sw_caps.sd3_curr_limit &
					SD_MAX_CURRENT_600)
				current_limit = SD_SET_CURRENT_LIMIT_600;
			else if (card->sw_caps.sd3_curr_limit &
					SD_MAX_CURRENT_400)
				current_limit = SD_SET_CURRENT_LIMIT_400;
			else if (card->sw_caps.sd3_curr_limit &
					SD_MAX_CURRENT_200)
				current_limit = SD_SET_CURRENT_LIMIT_200;
		} else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
			if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
				current_limit = SD_SET_CURRENT_LIMIT_600;
			else if (card->sw_caps.sd3_curr_limit &
					SD_MAX_CURRENT_400)
				current_limit = SD_SET_CURRENT_LIMIT_400;
			else if (card->sw_caps.sd3_curr_limit &
					SD_MAX_CURRENT_200)
				current_limit = SD_SET_CURRENT_LIMIT_200;
		} else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
			if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
				current_limit = SD_SET_CURRENT_LIMIT_400;
			else if (card->sw_caps.sd3_curr_limit &
					SD_MAX_CURRENT_200)
				current_limit = SD_SET_CURRENT_LIMIT_200;
		} else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
			if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
				current_limit = SD_SET_CURRENT_LIMIT_200;
		}
	} else
		current_limit = SD_SET_CURRENT_LIMIT_200;

	err = mmc_sd_switch(card, 1, 3, current_limit, status);
	if (err)
		return err;

	if (((status[15] >> 4) & 0x0F) != current_limit)
		printk(KERN_WARNING "%s: Problem setting current limit!\n",
			mmc_hostname(card->host));

	return 0;
}

573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605
/*
 * UHS-I specific initialization procedure
 */
static int mmc_sd_init_uhs_card(struct mmc_card *card)
{
	int err;
	u8 *status;

	if (!card->scr.sda_spec3)
		return 0;

	if (!(card->csd.cmdclass & CCC_SWITCH))
		return 0;

	status = kmalloc(64, GFP_KERNEL);
	if (!status) {
		printk(KERN_ERR "%s: could not allocate a buffer for "
			"switch capabilities.\n", mmc_hostname(card->host));
		return -ENOMEM;
	}

	/* Set 4-bit bus width */
	if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
	    (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
		err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
		if (err)
			goto out;

		mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	}

	/* Set the driver strength for the card */
	err = sd_select_driver_type(card, status);
606 607 608 609 610
	if (err)
		goto out;

	/* Set bus speed mode of the card */
	err = sd_set_bus_speed_mode(card, status);
611 612 613 614 615
	if (err)
		goto out;

	/* Set current limit for the card */
	err = sd_set_current_limit(card, status);
616 617 618 619 620 621 622

out:
	kfree(status);

	return err;
}

623 624 625 626 627 628
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(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
629 630
MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
631 632 633 634 635 636 637 638 639 640 641 642 643
MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
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(serial, "0x%08x\n", card->cid.serial);


static struct attribute *sd_std_attrs[] = {
	&dev_attr_cid.attr,
	&dev_attr_csd.attr,
	&dev_attr_scr.attr,
	&dev_attr_date.attr,
644 645
	&dev_attr_erase_size.attr,
	&dev_attr_preferred_erase_size.attr,
646 647 648 649 650 651 652 653 654 655 656 657 658
	&dev_attr_fwrev.attr,
	&dev_attr_hwrev.attr,
	&dev_attr_manfid.attr,
	&dev_attr_name.attr,
	&dev_attr_oemid.attr,
	&dev_attr_serial.attr,
	NULL,
};

static struct attribute_group sd_std_attr_group = {
	.attrs = sd_std_attrs,
};

659
static const struct attribute_group *sd_attr_groups[] = {
660 661 662 663
	&sd_std_attr_group,
	NULL,
};

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Michal Miroslaw 已提交
664
struct device_type sd_type = {
665 666 667
	.groups = sd_attr_groups,
};

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668
/*
M
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669
 * Fetch CID from card.
P
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670
 */
671
int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
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672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688
{
	int err;

	/*
	 * 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(host);

	/*
	 * If SD_SEND_IF_COND indicates an SD 2.0
	 * compliant card and we should set bit 30
	 * of the ocr to indicate that we can handle
	 * block-addressed SDHC cards.
	 */
689
	err = mmc_send_if_cond(host, ocr);
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Pierre Ossman 已提交
690
	if (!err)
691
		ocr |= SD_OCR_CCS;
P
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692

693 694 695 696 697 698 699 700 701 702 703 704 705 706
	/*
	 * If the host supports one of UHS-I modes, request the card
	 * to switch to 1.8V signaling level.
	 */
	if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
	    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
		ocr |= SD_OCR_S18R;

	/* If the host can supply more than 150mA, XPC should be set to 1. */
	if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 |
	    MMC_CAP_SET_XPC_180))
		ocr |= SD_OCR_XPC;

try_again:
707
	err = mmc_send_app_op_cond(host, ocr, rocr);
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Pierre Ossman 已提交
708
	if (err)
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709
		return err;
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710

711 712 713 714
	/*
	 * In case CCS and S18A in the response is set, start Signal Voltage
	 * Switch procedure. SPI mode doesn't support CMD11.
	 */
715 716
	if (!mmc_host_is_spi(host) && rocr &&
	   ((*rocr & 0x41000000) == 0x41000000)) {
717 718 719 720 721 722 723
		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
		if (err) {
			ocr &= ~SD_OCR_S18R;
			goto try_again;
		}
	}

D
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724 725 726 727
	if (mmc_host_is_spi(host))
		err = mmc_send_cid(host, cid);
	else
		err = mmc_all_send_cid(host, cid);
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728 729 730 731 732 733 734 735 736 737 738 739

	return err;
}

int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
{
	int err;

	/*
	 * Fetch CSD from card.
	 */
	err = mmc_send_csd(card, card->raw_csd);
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Pierre Ossman 已提交
740
	if (err)
M
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741
		return err;
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742

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743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766
	err = mmc_decode_csd(card);
	if (err)
		return err;

	return 0;
}

int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
	bool reinit)
{
	int err;

	if (!reinit) {
		/*
		 * Fetch SCR from card.
		 */
		err = mmc_app_send_scr(card, card->raw_scr);
		if (err)
			return err;

		err = mmc_decode_scr(card);
		if (err)
			return err;

767 768 769 770 771 772 773 774 775 776
		/*
		 * Fetch and process SD Status register.
		 */
		err = mmc_read_ssr(card);
		if (err)
			return err;

		/* Erase init depends on CSD and SSR */
		mmc_init_erase(card);

M
Michal Miroslaw 已提交
777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
		/*
		 * Fetch switch information from card.
		 */
		err = mmc_read_switch(card);
		if (err)
			return err;
	}

	/*
	 * For SPI, enable CRC as appropriate.
	 * This CRC enable is located AFTER the reading of the
	 * card registers because some SDHC cards are not able
	 * to provide valid CRCs for non-512-byte blocks.
	 */
	if (mmc_host_is_spi(host)) {
		err = mmc_spi_set_crc(host, use_spi_crc);
		if (err)
			return err;
	}

	/*
	 * Check if read-only switch is active.
	 */
	if (!reinit) {
		int ro = -1;

		if (host->ops->get_ro)
			ro = host->ops->get_ro(host);

		if (ro < 0) {
			printk(KERN_WARNING "%s: host does not "
				"support reading read-only "
				"switch. assuming write-enable.\n",
				mmc_hostname(host));
		} else if (ro > 0) {
			mmc_card_set_readonly(card);
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Pierre Ossman 已提交
813
		}
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Michal Miroslaw 已提交
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850
	}

	return 0;
}

unsigned mmc_sd_get_max_clock(struct mmc_card *card)
{
	unsigned max_dtr = (unsigned int)-1;

	if (mmc_card_highspeed(card)) {
		if (max_dtr > card->sw_caps.hs_max_dtr)
			max_dtr = card->sw_caps.hs_max_dtr;
	} else if (max_dtr > card->csd.max_dtr) {
		max_dtr = card->csd.max_dtr;
	}

	return max_dtr;
}

void mmc_sd_go_highspeed(struct mmc_card *card)
{
	mmc_card_set_highspeed(card);
	mmc_set_timing(card->host, MMC_TIMING_SD_HS);
}

/*
 * 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_sd_init_card(struct mmc_host *host, u32 ocr,
	struct mmc_card *oldcard)
{
	struct mmc_card *card;
	int err;
	u32 cid[4];
851
	u32 rocr = 0;
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Michal Miroslaw 已提交
852 853 854 855

	BUG_ON(!host);
	WARN_ON(!host->claimed);

856
	err = mmc_sd_get_cid(host, ocr, cid, &rocr);
M
Michal Miroslaw 已提交
857 858 859 860 861 862
	if (err)
		return err;

	if (oldcard) {
		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
			return -ENOENT;
P
Pierre Ossman 已提交
863

864 865 866 867 868
		card = oldcard;
	} else {
		/*
		 * Allocate card structure.
		 */
869
		card = mmc_alloc_card(host, &sd_type);
M
Michal Miroslaw 已提交
870 871
		if (IS_ERR(card))
			return PTR_ERR(card);
872 873 874 875

		card->type = MMC_TYPE_SD;
		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	}
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Pierre Ossman 已提交
876 877

	/*
D
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878
	 * For native busses:  get card RCA and quit open drain mode.
P
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879
	 */
D
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880 881 882
	if (!mmc_host_is_spi(host)) {
		err = mmc_send_relative_addr(host, &card->rca);
		if (err)
M
Michal Miroslaw 已提交
883
			return err;
P
Pierre Ossman 已提交
884

D
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885 886
		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	}
P
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887

888
	if (!oldcard) {
M
Michal Miroslaw 已提交
889
		err = mmc_sd_get_csd(host, card);
P
Pierre Ossman 已提交
890
		if (err)
M
Michal Miroslaw 已提交
891
			return err;
P
Pierre Ossman 已提交
892

893 894
		mmc_decode_cid(card);
	}
P
Pierre Ossman 已提交
895 896

	/*
897
	 * Select card, as all following commands rely on that.
P
Pierre Ossman 已提交
898
	 */
D
David Brownell 已提交
899 900 901
	if (!mmc_host_is_spi(host)) {
		err = mmc_select_card(card);
		if (err)
M
Michal Miroslaw 已提交
902
			return err;
903
	}
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Pierre Ossman 已提交
904

M
Michal Miroslaw 已提交
905 906 907
	err = mmc_sd_setup_card(host, card, oldcard != NULL);
	if (err)
		goto free_card;
908

909 910 911
	/* Initialization sequence for UHS-I cards */
	if (rocr & SD_ROCR_S18A) {
		err = mmc_sd_init_uhs_card(card);
P
Pierre Ossman 已提交
912
		if (err)
P
Pierre Ossman 已提交
913
			goto free_card;
914 915 916 917 918 919 920 921 922 923 924 925 926 927
	} else {
		/*
		 * Attempt to change to high-speed (if supported)
		 */
		err = mmc_sd_switch_hs(card);
		if (err > 0)
			mmc_sd_go_highspeed(card);
		else if (err)
			goto free_card;

		/*
		 * Set bus speed.
		 */
		mmc_set_clock(host, mmc_sd_get_max_clock(card));
P
Pierre Ossman 已提交
928

929 930 931 932 933 934 935 936 937 938 939
		/*
		 * Switch to wider bus (if supported).
		 */
		if ((host->caps & MMC_CAP_4_BIT_DATA) &&
			(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
			err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
			if (err)
				goto free_card;

			mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
		}
P
Pierre Ossman 已提交
940 941
	}

M
Michal Miroslaw 已提交
942
	host->card = card;
P
Pierre Ossman 已提交
943
	return 0;
944 945 946 947 948

free_card:
	if (!oldcard)
		mmc_remove_card(card);

P
Pierre Ossman 已提交
949
	return err;
950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979
}

/*
 * Host is being removed. Free up the current card.
 */
static void mmc_sd_remove(struct mmc_host *host)
{
	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_remove_card(host->card);
	host->card = NULL;
}

/*
 * Card detection callback from host.
 */
static void mmc_sd_detect(struct mmc_host *host)
{
	int err;

	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_claim_host(host);

	/*
	 * Just check if our card has been removed.
	 */
	err = mmc_send_status(host->card, NULL);
P
Pierre Ossman 已提交
980 981 982

	mmc_release_host(host);

P
Pierre Ossman 已提交
983
	if (err) {
P
Pierre Ossman 已提交
984
		mmc_sd_remove(host);
985 986 987 988 989 990 991 992 993 994

		mmc_claim_host(host);
		mmc_detach_bus(host);
		mmc_release_host(host);
	}
}

/*
 * Suspend callback from host.
 */
995
static int mmc_sd_suspend(struct mmc_host *host)
996 997 998 999 1000
{
	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_claim_host(host);
D
David Brownell 已提交
1001 1002
	if (!mmc_host_is_spi(host))
		mmc_deselect_cards(host);
1003 1004
	host->card->state &= ~MMC_STATE_HIGHSPEED;
	mmc_release_host(host);
1005 1006

	return 0;
1007 1008 1009 1010 1011 1012 1013 1014
}

/*
 * Resume callback from host.
 *
 * This function tries to determine if the same card is still present
 * and, if so, restore all state to it.
 */
1015
static int mmc_sd_resume(struct mmc_host *host)
1016 1017 1018 1019 1020 1021 1022 1023
{
	int err;

	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_claim_host(host);
	err = mmc_sd_init_card(host, host->ocr, host->card);
1024 1025
	mmc_release_host(host);

1026
	return err;
1027 1028
}

1029
static int mmc_sd_power_restore(struct mmc_host *host)
1030
{
1031 1032
	int ret;

1033 1034
	host->card->state &= ~MMC_STATE_HIGHSPEED;
	mmc_claim_host(host);
1035
	ret = mmc_sd_init_card(host, host->ocr, host->card);
1036
	mmc_release_host(host);
1037 1038

	return ret;
1039 1040
}

1041
static const struct mmc_bus_ops mmc_sd_ops = {
1042 1043 1044 1045
	.remove = mmc_sd_remove,
	.detect = mmc_sd_detect,
	.suspend = NULL,
	.resume = NULL,
1046
	.power_restore = mmc_sd_power_restore,
1047 1048 1049
};

static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1050 1051 1052 1053
	.remove = mmc_sd_remove,
	.detect = mmc_sd_detect,
	.suspend = mmc_sd_suspend,
	.resume = mmc_sd_resume,
1054
	.power_restore = mmc_sd_power_restore,
1055 1056
};

1057 1058 1059 1060
static void mmc_sd_attach_bus_ops(struct mmc_host *host)
{
	const struct mmc_bus_ops *bus_ops;

1061
	if (!mmc_card_is_removable(host))
1062 1063 1064 1065 1066 1067
		bus_ops = &mmc_sd_ops_unsafe;
	else
		bus_ops = &mmc_sd_ops;
	mmc_attach_bus(host, bus_ops);
}

1068 1069 1070
/*
 * Starting point for SD card init.
 */
1071
int mmc_attach_sd(struct mmc_host *host)
1072 1073
{
	int err;
1074
	u32 ocr;
1075 1076

	BUG_ON(!host);
P
Pierre Ossman 已提交
1077
	WARN_ON(!host->claimed);
1078

1079 1080 1081 1082 1083
	/* Make sure we are at 3.3V signalling voltage */
	err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
	if (err)
		return err;

1084 1085 1086 1087
	err = mmc_send_app_op_cond(host, 0, &ocr);
	if (err)
		return err;

1088
	mmc_sd_attach_bus_ops(host);
1089 1090
	if (host->ocr_avail_sd)
		host->ocr_avail = host->ocr_avail_sd;
1091

D
David Brownell 已提交
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102
	/*
	 * We need to get OCR a different way for SPI.
	 */
	if (mmc_host_is_spi(host)) {
		mmc_go_idle(host);

		err = mmc_spi_read_ocr(host, 0, &ocr);
		if (err)
			goto err;
	}

1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
	/*
	 * Sanity check the voltages that the card claims to
	 * support.
	 */
	if (ocr & 0x7F) {
		printk(KERN_WARNING "%s: card claims to support voltages "
		       "below the defined range. These will be ignored.\n",
		       mmc_hostname(host));
		ocr &= ~0x7F;
	}

1114 1115
	if ((ocr & MMC_VDD_165_195) &&
	    !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126
		printk(KERN_WARNING "%s: SD card claims to support the "
		       "incompletely defined 'low voltage range'. This "
		       "will be ignored.\n", mmc_hostname(host));
		ocr &= ~MMC_VDD_165_195;
	}

	host->ocr = mmc_select_voltage(host, ocr);

	/*
	 * Can we support the voltage(s) of the card(s)?
	 */
1127 1128
	if (!host->ocr) {
		err = -EINVAL;
1129
		goto err;
1130
	}
1131 1132 1133 1134 1135

	/*
	 * Detect and init the card.
	 */
	err = mmc_sd_init_card(host, host->ocr, NULL);
P
Pierre Ossman 已提交
1136
	if (err)
1137 1138 1139
		goto err;

	mmc_release_host(host);
P
Pierre Ossman 已提交
1140
	err = mmc_add_card(host->card);
1141
	mmc_claim_host(host);
P
Pierre Ossman 已提交
1142
	if (err)
1143
		goto remove_card;
P
Pierre Ossman 已提交
1144 1145 1146

	return 0;

1147
remove_card:
1148
	mmc_release_host(host);
1149
	mmc_remove_card(host->card);
P
Pierre Ossman 已提交
1150
	host->card = NULL;
1151
	mmc_claim_host(host);
P
Pierre Ossman 已提交
1152 1153 1154
err:
	mmc_detach_bus(host);

1155 1156 1157
	printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
		mmc_hostname(host), err);

P
Pierre Ossman 已提交
1158
	return err;
P
Pierre Ossman 已提交
1159 1160
}