sd.c 26.9 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:
		/*
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		 * This is a block-addressed SDHC or SDXC card. Most
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		 * 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);
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		csd->c_size	  = UNSTUFF_BITS(resp, 48, 22);

		/* SDXC cards have a minimum C_SIZE of 0x00FFFF */
		if (csd->c_size >= 0xFFFF)
			mmc_card_set_ext_capacity(card);
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		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;
}

520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577
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;
}

578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610
/*
 * 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);
611 612 613 614 615
	if (err)
		goto out;

	/* Set bus speed mode of the card */
	err = sd_set_bus_speed_mode(card, status);
616 617 618 619 620
	if (err)
		goto out;

	/* Set current limit for the card */
	err = sd_set_current_limit(card, status);
621 622 623 624 625 626 627

out:
	kfree(status);

	return err;
}

628 629 630 631 632 633
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);
634 635
MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
636 637 638 639 640 641 642 643 644 645 646 647 648
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,
649 650
	&dev_attr_erase_size.attr,
	&dev_attr_preferred_erase_size.attr,
651 652 653 654 655 656 657 658 659 660 661 662 663
	&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,
};

664
static const struct attribute_group *sd_attr_groups[] = {
665 666 667 668
	&sd_std_attr_group,
	NULL,
};

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Michal Miroslaw 已提交
669
struct device_type sd_type = {
670 671 672
	.groups = sd_attr_groups,
};

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Pierre Ossman 已提交
673
/*
M
Michal Miroslaw 已提交
674
 * Fetch CID from card.
P
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675
 */
676
int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
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Pierre Ossman 已提交
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693
{
	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.
	 */
694
	err = mmc_send_if_cond(host, ocr);
P
Pierre Ossman 已提交
695
	if (!err)
696
		ocr |= SD_OCR_CCS;
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697

698 699 700 701 702 703 704 705 706 707 708 709 710 711
	/*
	 * 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:
712
	err = mmc_send_app_op_cond(host, ocr, rocr);
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Pierre Ossman 已提交
713
	if (err)
M
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714
		return err;
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715

716 717 718 719
	/*
	 * In case CCS and S18A in the response is set, start Signal Voltage
	 * Switch procedure. SPI mode doesn't support CMD11.
	 */
720 721
	if (!mmc_host_is_spi(host) && rocr &&
	   ((*rocr & 0x41000000) == 0x41000000)) {
722 723 724 725 726 727 728
		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
		if (err) {
			ocr &= ~SD_OCR_S18R;
			goto try_again;
		}
	}

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729 730 731 732
	if (mmc_host_is_spi(host))
		err = mmc_send_cid(host, cid);
	else
		err = mmc_all_send_cid(host, cid);
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733 734 735 736 737 738 739 740 741 742 743 744

	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
745
	if (err)
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746
		return err;
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747

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748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771
	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;

772 773 774 775 776 777 778 779 780 781
		/*
		 * 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);

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Michal Miroslaw 已提交
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817
		/*
		 * 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
818
		}
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Michal Miroslaw 已提交
819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855
	}

	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];
856
	u32 rocr = 0;
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Michal Miroslaw 已提交
857 858 859 860

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

861
	err = mmc_sd_get_cid(host, ocr, cid, &rocr);
M
Michal Miroslaw 已提交
862 863 864 865 866 867
	if (err)
		return err;

	if (oldcard) {
		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
			return -ENOENT;
P
Pierre Ossman 已提交
868

869 870 871 872 873
		card = oldcard;
	} else {
		/*
		 * Allocate card structure.
		 */
874
		card = mmc_alloc_card(host, &sd_type);
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Michal Miroslaw 已提交
875 876
		if (IS_ERR(card))
			return PTR_ERR(card);
877 878 879 880

		card->type = MMC_TYPE_SD;
		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	}
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Pierre Ossman 已提交
881 882

	/*
D
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883
	 * For native busses:  get card RCA and quit open drain mode.
P
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884
	 */
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885 886 887
	if (!mmc_host_is_spi(host)) {
		err = mmc_send_relative_addr(host, &card->rca);
		if (err)
M
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888
			return err;
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Pierre Ossman 已提交
889

D
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890 891
		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	}
P
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892

893
	if (!oldcard) {
M
Michal Miroslaw 已提交
894
		err = mmc_sd_get_csd(host, card);
P
Pierre Ossman 已提交
895
		if (err)
M
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896
			return err;
P
Pierre Ossman 已提交
897

898 899
		mmc_decode_cid(card);
	}
P
Pierre Ossman 已提交
900 901

	/*
902
	 * Select card, as all following commands rely on that.
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Pierre Ossman 已提交
903
	 */
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904 905 906
	if (!mmc_host_is_spi(host)) {
		err = mmc_select_card(card);
		if (err)
M
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907
			return err;
908
	}
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909

M
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910 911 912
	err = mmc_sd_setup_card(host, card, oldcard != NULL);
	if (err)
		goto free_card;
913

914 915 916
	/* Initialization sequence for UHS-I cards */
	if (rocr & SD_ROCR_S18A) {
		err = mmc_sd_init_uhs_card(card);
P
Pierre Ossman 已提交
917
		if (err)
P
Pierre Ossman 已提交
918
			goto free_card;
919 920 921

		/* Card is an ultra-high-speed card */
		mmc_sd_card_set_uhs(card);
922 923 924 925 926 927 928 929 930 931 932 933 934 935
	} 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
936

937 938 939 940 941 942 943 944 945 946 947
		/*
		 * 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
948 949
	}

M
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950
	host->card = card;
P
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951
	return 0;
952 953 954 955 956

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

P
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957
	return err;
958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987
}

/*
 * 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);
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Pierre Ossman 已提交
988 989 990

	mmc_release_host(host);

P
Pierre Ossman 已提交
991
	if (err) {
P
Pierre Ossman 已提交
992
		mmc_sd_remove(host);
993 994 995 996 997 998 999 1000 1001 1002

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

/*
 * Suspend callback from host.
 */
1003
static int mmc_sd_suspend(struct mmc_host *host)
1004 1005 1006 1007 1008
{
	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_claim_host(host);
D
David Brownell 已提交
1009 1010
	if (!mmc_host_is_spi(host))
		mmc_deselect_cards(host);
1011 1012
	host->card->state &= ~MMC_STATE_HIGHSPEED;
	mmc_release_host(host);
1013 1014

	return 0;
1015 1016 1017 1018 1019 1020 1021 1022
}

/*
 * Resume callback from host.
 *
 * This function tries to determine if the same card is still present
 * and, if so, restore all state to it.
 */
1023
static int mmc_sd_resume(struct mmc_host *host)
1024 1025 1026 1027 1028 1029 1030 1031
{
	int err;

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

	mmc_claim_host(host);
	err = mmc_sd_init_card(host, host->ocr, host->card);
1032 1033
	mmc_release_host(host);

1034
	return err;
1035 1036
}

1037
static int mmc_sd_power_restore(struct mmc_host *host)
1038
{
1039 1040
	int ret;

1041 1042
	host->card->state &= ~MMC_STATE_HIGHSPEED;
	mmc_claim_host(host);
1043
	ret = mmc_sd_init_card(host, host->ocr, host->card);
1044
	mmc_release_host(host);
1045 1046

	return ret;
1047 1048
}

1049
static const struct mmc_bus_ops mmc_sd_ops = {
1050 1051 1052 1053
	.remove = mmc_sd_remove,
	.detect = mmc_sd_detect,
	.suspend = NULL,
	.resume = NULL,
1054
	.power_restore = mmc_sd_power_restore,
1055 1056 1057
};

static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1058 1059 1060 1061
	.remove = mmc_sd_remove,
	.detect = mmc_sd_detect,
	.suspend = mmc_sd_suspend,
	.resume = mmc_sd_resume,
1062
	.power_restore = mmc_sd_power_restore,
1063 1064
};

1065 1066 1067 1068
static void mmc_sd_attach_bus_ops(struct mmc_host *host)
{
	const struct mmc_bus_ops *bus_ops;

1069
	if (!mmc_card_is_removable(host))
1070 1071 1072 1073 1074 1075
		bus_ops = &mmc_sd_ops_unsafe;
	else
		bus_ops = &mmc_sd_ops;
	mmc_attach_bus(host, bus_ops);
}

1076 1077 1078
/*
 * Starting point for SD card init.
 */
1079
int mmc_attach_sd(struct mmc_host *host)
1080 1081
{
	int err;
1082
	u32 ocr;
1083 1084

	BUG_ON(!host);
P
Pierre Ossman 已提交
1085
	WARN_ON(!host->claimed);
1086

1087 1088 1089 1090 1091
	/* Make sure we are at 3.3V signalling voltage */
	err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
	if (err)
		return err;

1092 1093 1094 1095
	err = mmc_send_app_op_cond(host, 0, &ocr);
	if (err)
		return err;

1096
	mmc_sd_attach_bus_ops(host);
1097 1098
	if (host->ocr_avail_sd)
		host->ocr_avail = host->ocr_avail_sd;
1099

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David Brownell 已提交
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
	/*
	 * 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;
	}

1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121
	/*
	 * 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;
	}

1122 1123
	if ((ocr & MMC_VDD_165_195) &&
	    !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
		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)?
	 */
1135 1136
	if (!host->ocr) {
		err = -EINVAL;
1137
		goto err;
1138
	}
1139 1140 1141 1142 1143

	/*
	 * Detect and init the card.
	 */
	err = mmc_sd_init_card(host, host->ocr, NULL);
P
Pierre Ossman 已提交
1144
	if (err)
1145 1146 1147
		goto err;

	mmc_release_host(host);
P
Pierre Ossman 已提交
1148
	err = mmc_add_card(host->card);
1149
	mmc_claim_host(host);
P
Pierre Ossman 已提交
1150
	if (err)
1151
		goto remove_card;
P
Pierre Ossman 已提交
1152 1153 1154

	return 0;

1155
remove_card:
1156
	mmc_release_host(host);
1157
	mmc_remove_card(host->card);
P
Pierre Ossman 已提交
1158
	host->card = NULL;
1159
	mmc_claim_host(host);
P
Pierre Ossman 已提交
1160 1161 1162
err:
	mmc_detach_bus(host);

1163 1164 1165
	printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
		mmc_hostname(host), err);

P
Pierre Ossman 已提交
1166
	return err;
P
Pierre Ossman 已提交
1167 1168
}