sd.c 28.0 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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	if (scr->sda_spec3)
		scr->cmds = UNSTUFF_BITS(resp, 32, 2);
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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)
{
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	int host_drv_type = SD_DRIVER_TYPE_B;
	int card_drv_type = SD_DRIVER_TYPE_B;
	int drive_strength;
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	int err;

	/*
	 * If the host doesn't support any of the Driver Types A,C or D,
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	 * or there is no board specific handler then default Driver
	 * Type B is used.
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	 */
	if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
	    | MMC_CAP_DRIVER_TYPE_D)))
		return 0;

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	if (!card->host->ops->select_drive_strength)
		return 0;

	if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
		host_drv_type |= SD_DRIVER_TYPE_A;

	if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
		host_drv_type |= SD_DRIVER_TYPE_C;

	if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
		host_drv_type |= SD_DRIVER_TYPE_D;

	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
		card_drv_type |= SD_DRIVER_TYPE_A;

	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
		card_drv_type |= SD_DRIVER_TYPE_C;

	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
		card_drv_type |= SD_DRIVER_TYPE_D;

	/*
	 * The drive strength that the hardware can support
	 * depends on the board design.  Pass the appropriate
	 * information and let the hardware specific code
	 * return what is possible given the options
	 */
	drive_strength = card->host->ops->select_drive_strength(
		card->sw_caps.uhs_max_dtr,
		host_drv_type, card_drv_type);
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	err = mmc_sd_switch(card, 1, 2, drive_strength, status);
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	if (err)
		return err;

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

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	mmc_set_driver_type(card->host, drive_strength);
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	return 0;
}

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static void sd_update_bus_speed_mode(struct mmc_card *card)
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{
	/*
	 * 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 |
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	    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))) {
		card->sd_bus_speed = 0;
		return;
	}
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	if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
	    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
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			card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
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	} else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
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			card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
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	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
		    MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
		    SD_MODE_UHS_SDR50)) {
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			card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
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	} 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)) {
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			card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
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	} 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)) {
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			card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
	}
}

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

	switch (card->sd_bus_speed) {
	case UHS_SDR104_BUS_SPEED:
		timing = MMC_TIMING_UHS_SDR104;
		card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
		break;
	case UHS_DDR50_BUS_SPEED:
		timing = MMC_TIMING_UHS_DDR50;
		card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
		break;
	case UHS_SDR50_BUS_SPEED:
		timing = MMC_TIMING_UHS_SDR50;
		card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
		break;
	case UHS_SDR25_BUS_SPEED:
		timing = MMC_TIMING_UHS_SDR25;
		card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
		break;
	case UHS_SDR12_BUS_SPEED:
		timing = MMC_TIMING_UHS_SDR12;
		card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
		break;
	default:
		return 0;
534 535
	}

536
	err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
537 538 539
	if (err)
		return err;

540
	if ((status[16] & 0xF) != card->sd_bus_speed)
541 542 543 544 545 546 547 548 549 550
		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;
}

551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608
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;
}

609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639
/*
 * 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);
	}

640 641 642 643 644 645
	/*
	 * Select the bus speed mode depending on host
	 * and card capability.
	 */
	sd_update_bus_speed_mode(card);

646 647
	/* Set the driver strength for the card */
	err = sd_select_driver_type(card, status);
648 649 650
	if (err)
		goto out;

651 652
	/* Set current limit for the card */
	err = sd_set_current_limit(card, status);
653 654 655
	if (err)
		goto out;

656 657
	/* Set bus speed mode of the card */
	err = sd_set_bus_speed_mode(card, status);
658 659 660 661 662 663
	if (err)
		goto out;

	/* SPI mode doesn't define CMD19 */
	if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
		err = card->host->ops->execute_tuning(card->host);
664 665 666 667 668 669 670

out:
	kfree(status);

	return err;
}

671 672 673 674 675 676
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);
677 678
MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
679 680 681 682 683 684 685 686 687 688 689 690 691
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,
692 693
	&dev_attr_erase_size.attr,
	&dev_attr_preferred_erase_size.attr,
694 695 696 697 698 699 700 701 702 703 704 705 706
	&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,
};

707
static const struct attribute_group *sd_attr_groups[] = {
708 709 710 711
	&sd_std_attr_group,
	NULL,
};

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Michal Miroslaw 已提交
712
struct device_type sd_type = {
713 714 715
	.groups = sd_attr_groups,
};

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Pierre Ossman 已提交
716
/*
M
Michal Miroslaw 已提交
717
 * Fetch CID from card.
P
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718
 */
719
int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
P
Pierre Ossman 已提交
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736
{
	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.
	 */
737
	err = mmc_send_if_cond(host, ocr);
P
Pierre Ossman 已提交
738
	if (!err)
739
		ocr |= SD_OCR_CCS;
P
Pierre Ossman 已提交
740

741 742 743 744 745 746 747 748 749 750 751 752 753 754
	/*
	 * 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:
755
	err = mmc_send_app_op_cond(host, ocr, rocr);
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Pierre Ossman 已提交
756
	if (err)
M
Michal Miroslaw 已提交
757
		return err;
P
Pierre Ossman 已提交
758

759 760 761 762
	/*
	 * In case CCS and S18A in the response is set, start Signal Voltage
	 * Switch procedure. SPI mode doesn't support CMD11.
	 */
763 764
	if (!mmc_host_is_spi(host) && rocr &&
	   ((*rocr & 0x41000000) == 0x41000000)) {
765
		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
766 767 768 769 770 771
		if (err) {
			ocr &= ~SD_OCR_S18R;
			goto try_again;
		}
	}

D
David Brownell 已提交
772 773 774 775
	if (mmc_host_is_spi(host))
		err = mmc_send_cid(host, cid);
	else
		err = mmc_all_send_cid(host, cid);
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Michal Miroslaw 已提交
776 777 778 779 780 781 782 783 784 785 786 787

	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);
P
Pierre Ossman 已提交
788
	if (err)
M
Michal Miroslaw 已提交
789
		return err;
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790

M
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791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814
	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;

815 816 817 818 819 820 821 822 823 824
		/*
		 * 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
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860
		/*
		 * 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);
P
Pierre Ossman 已提交
861
		}
M
Michal Miroslaw 已提交
862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
	}

	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];
899
	u32 rocr = 0;
M
Michal Miroslaw 已提交
900 901 902 903

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

904
	err = mmc_sd_get_cid(host, ocr, cid, &rocr);
M
Michal Miroslaw 已提交
905 906 907 908 909 910
	if (err)
		return err;

	if (oldcard) {
		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
			return -ENOENT;
P
Pierre Ossman 已提交
911

912 913 914 915 916
		card = oldcard;
	} else {
		/*
		 * Allocate card structure.
		 */
917
		card = mmc_alloc_card(host, &sd_type);
M
Michal Miroslaw 已提交
918 919
		if (IS_ERR(card))
			return PTR_ERR(card);
920 921 922 923

		card->type = MMC_TYPE_SD;
		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	}
P
Pierre Ossman 已提交
924 925

	/*
D
David Brownell 已提交
926
	 * For native busses:  get card RCA and quit open drain mode.
P
Pierre Ossman 已提交
927
	 */
D
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928 929 930
	if (!mmc_host_is_spi(host)) {
		err = mmc_send_relative_addr(host, &card->rca);
		if (err)
M
Michal Miroslaw 已提交
931
			return err;
D
David Brownell 已提交
932
	}
P
Pierre Ossman 已提交
933

934
	if (!oldcard) {
M
Michal Miroslaw 已提交
935
		err = mmc_sd_get_csd(host, card);
P
Pierre Ossman 已提交
936
		if (err)
M
Michal Miroslaw 已提交
937
			return err;
P
Pierre Ossman 已提交
938

939 940
		mmc_decode_cid(card);
	}
P
Pierre Ossman 已提交
941 942

	/*
943
	 * Select card, as all following commands rely on that.
P
Pierre Ossman 已提交
944
	 */
D
David Brownell 已提交
945 946 947
	if (!mmc_host_is_spi(host)) {
		err = mmc_select_card(card);
		if (err)
M
Michal Miroslaw 已提交
948
			return err;
949
	}
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Pierre Ossman 已提交
950

M
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951 952 953
	err = mmc_sd_setup_card(host, card, oldcard != NULL);
	if (err)
		goto free_card;
954

955 956 957
	/* Initialization sequence for UHS-I cards */
	if (rocr & SD_ROCR_S18A) {
		err = mmc_sd_init_uhs_card(card);
P
Pierre Ossman 已提交
958
		if (err)
P
Pierre Ossman 已提交
959
			goto free_card;
960 961 962

		/* Card is an ultra-high-speed card */
		mmc_sd_card_set_uhs(card);
963 964 965 966 967 968 969

		/*
		 * Since initialization is now complete, enable preset
		 * value registers for UHS-I cards.
		 */
		if (host->ops->enable_preset_value)
			host->ops->enable_preset_value(host, true);
970 971 972 973 974 975 976 977 978 979 980 981 982 983
	} 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
984

985 986 987 988 989 990 991 992 993 994 995
		/*
		 * 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
996 997
	}

M
Michal Miroslaw 已提交
998
	host->card = card;
P
Pierre Ossman 已提交
999
	return 0;
1000 1001 1002 1003 1004

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

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1005
	return err;
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
}

/*
 * 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
1036 1037 1038

	mmc_release_host(host);

P
Pierre Ossman 已提交
1039
	if (err) {
P
Pierre Ossman 已提交
1040
		mmc_sd_remove(host);
1041 1042 1043

		mmc_claim_host(host);
		mmc_detach_bus(host);
1044
		mmc_power_off(host);
1045 1046 1047 1048 1049 1050 1051
		mmc_release_host(host);
	}
}

/*
 * Suspend callback from host.
 */
1052
static int mmc_sd_suspend(struct mmc_host *host)
1053 1054 1055 1056 1057
{
	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_claim_host(host);
D
David Brownell 已提交
1058 1059
	if (!mmc_host_is_spi(host))
		mmc_deselect_cards(host);
1060 1061
	host->card->state &= ~MMC_STATE_HIGHSPEED;
	mmc_release_host(host);
1062 1063

	return 0;
1064 1065 1066 1067 1068 1069 1070 1071
}

/*
 * Resume callback from host.
 *
 * This function tries to determine if the same card is still present
 * and, if so, restore all state to it.
 */
1072
static int mmc_sd_resume(struct mmc_host *host)
1073 1074 1075 1076 1077 1078 1079 1080
{
	int err;

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

	mmc_claim_host(host);
	err = mmc_sd_init_card(host, host->ocr, host->card);
1081 1082
	mmc_release_host(host);

1083
	return err;
1084 1085
}

1086
static int mmc_sd_power_restore(struct mmc_host *host)
1087
{
1088 1089
	int ret;

1090 1091
	host->card->state &= ~MMC_STATE_HIGHSPEED;
	mmc_claim_host(host);
1092
	ret = mmc_sd_init_card(host, host->ocr, host->card);
1093
	mmc_release_host(host);
1094 1095

	return ret;
1096 1097
}

1098
static const struct mmc_bus_ops mmc_sd_ops = {
1099 1100 1101 1102
	.remove = mmc_sd_remove,
	.detect = mmc_sd_detect,
	.suspend = NULL,
	.resume = NULL,
1103
	.power_restore = mmc_sd_power_restore,
1104 1105 1106
};

static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1107 1108 1109 1110
	.remove = mmc_sd_remove,
	.detect = mmc_sd_detect,
	.suspend = mmc_sd_suspend,
	.resume = mmc_sd_resume,
1111
	.power_restore = mmc_sd_power_restore,
1112 1113
};

1114 1115 1116 1117
static void mmc_sd_attach_bus_ops(struct mmc_host *host)
{
	const struct mmc_bus_ops *bus_ops;

1118
	if (!mmc_card_is_removable(host))
1119 1120 1121 1122 1123 1124
		bus_ops = &mmc_sd_ops_unsafe;
	else
		bus_ops = &mmc_sd_ops;
	mmc_attach_bus(host, bus_ops);
}

1125 1126 1127
/*
 * Starting point for SD card init.
 */
1128
int mmc_attach_sd(struct mmc_host *host)
1129 1130
{
	int err;
1131
	u32 ocr;
1132 1133

	BUG_ON(!host);
P
Pierre Ossman 已提交
1134
	WARN_ON(!host->claimed);
1135

1136
	/* Make sure we are at 3.3V signalling voltage */
1137
	err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
1138 1139 1140
	if (err)
		return err;

1141 1142 1143 1144
	/* Disable preset value enable if already set since last time */
	if (host->ops->enable_preset_value)
		host->ops->enable_preset_value(host, false);

1145 1146 1147 1148
	err = mmc_send_app_op_cond(host, 0, &ocr);
	if (err)
		return err;

1149
	mmc_sd_attach_bus_ops(host);
1150 1151
	if (host->ocr_avail_sd)
		host->ocr_avail = host->ocr_avail_sd;
1152

D
David Brownell 已提交
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163
	/*
	 * 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;
	}

1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
	/*
	 * 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;
	}

1175 1176
	if ((ocr & MMC_VDD_165_195) &&
	    !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
		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)?
	 */
1188 1189
	if (!host->ocr) {
		err = -EINVAL;
1190
		goto err;
1191
	}
1192 1193 1194 1195 1196

	/*
	 * Detect and init the card.
	 */
	err = mmc_sd_init_card(host, host->ocr, NULL);
P
Pierre Ossman 已提交
1197
	if (err)
1198 1199 1200
		goto err;

	mmc_release_host(host);
P
Pierre Ossman 已提交
1201
	err = mmc_add_card(host->card);
1202
	mmc_claim_host(host);
P
Pierre Ossman 已提交
1203
	if (err)
1204
		goto remove_card;
P
Pierre Ossman 已提交
1205 1206 1207

	return 0;

1208
remove_card:
1209
	mmc_release_host(host);
1210
	mmc_remove_card(host->card);
P
Pierre Ossman 已提交
1211
	host->card = NULL;
1212
	mmc_claim_host(host);
P
Pierre Ossman 已提交
1213 1214 1215
err:
	mmc_detach_bus(host);

1216 1217 1218
	printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
		mmc_hostname(host), err);

P
Pierre Ossman 已提交
1219
	return err;
P
Pierre Ossman 已提交
1220 1221
}