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Commit 5c4e6f13 authored by Pierre Ossman's avatar Pierre Ossman
Browse files

mmc: detect SDIO cards 



Really basic init sequence for SDIO cards.

Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
parent 1d4de9ed

MAINTAINERS

+1 −1
Original line number Diff line number Diff line
@@ -2561,7 +2561,7 @@ L: linux-kernel@vger.kernel.org 
W:	http://www.atnf.csiro.au/~rgooch/linux/kernel-patches.html

S:	Maintained



MULTIMEDIA CARD (MMC) AND SECURE DIGITAL (SD) SUBSYSTEM

MULTIMEDIA CARD (MMC), SECURE DIGITAL (SD) AND SDIO SUBSYSTEM

P:	Pierre Ossman

M:	drzeus-mmc@drzeus.cx

L:	linux-kernel@vger.kernel.org

drivers/mmc/core/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -8,5 +8,6 @@ endif 


obj-$(CONFIG_MMC)		+= mmc_core.o

mmc_core-y			:= core.o sysfs.o bus.o host.o \

				   mmc.o mmc_ops.o sd.o sd_ops.o

				   mmc.o mmc_ops.o sd.o sd_ops.o \

				   sdio.o sdio_ops.o

drivers/mmc/core/bus.c

+8 −0
Original line number Diff line number Diff line
@@ -34,6 +34,8 @@ static ssize_t mmc_type_show(struct device *dev, 
		return sprintf(buf, "MMC\n");

	case MMC_TYPE_SD:

		return sprintf(buf, "SD\n");

	case MMC_TYPE_SDIO:

		return sprintf(buf, "SDIO\n");

	default:

		return -EFAULT;

	}
@@ -76,6 +78,9 @@ mmc_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf, 
	case MMC_TYPE_SD:

		add_env("MMC_TYPE=%s", "SD");

		break;

	case MMC_TYPE_SDIO:

		add_env("MMC_TYPE=%s", "SDIO");

		break;

	}



	add_env("MMC_NAME=%s", mmc_card_name(card));
@@ -221,6 +226,9 @@ int mmc_add_card(struct mmc_card *card) 
		if (mmc_card_blockaddr(card))

			type = "SDHC";

		break;

	case MMC_TYPE_SDIO:

		type = "SDIO";

		break;

	default:

		type = "?";

		break;

drivers/mmc/core/core.c

+28 −12
Original line number Diff line number Diff line
@@ -32,9 +32,11 @@ 


#include "mmc_ops.h"

#include "sd_ops.h"

#include "sdio_ops.h"



extern int mmc_attach_mmc(struct mmc_host *host, u32 ocr);

extern int mmc_attach_sd(struct mmc_host *host, u32 ocr);

extern int mmc_attach_sdio(struct mmc_host *host, u32 ocr);



static struct workqueue_struct *workqueue;
@@ -595,24 +597,38 @@ void mmc_rescan(struct work_struct *work) 


		mmc_send_if_cond(host, host->ocr_avail);



		/*

		 * First we search for SDIO...

		 */

		err = mmc_send_io_op_cond(host, 0, &ocr);

		if (!err) {

			if (mmc_attach_sdio(host, ocr))

				mmc_power_off(host);

			return;

		}



		/*

		 * ...then normal SD...

		 */

		err = mmc_send_app_op_cond(host, 0, &ocr);

		if (!err) {

			if (mmc_attach_sd(host, ocr))

				mmc_power_off(host);

		} else {

			return;

		}



		/*

			 * If we fail to detect any SD cards then try

			 * searching for MMC cards.

		 * ...and finally MMC.

		 */

		err = mmc_send_op_cond(host, 0, &ocr);

		if (!err) {

			if (mmc_attach_mmc(host, ocr))

				mmc_power_off(host);

			} else {

				mmc_power_off(host);

				mmc_release_host(host);

			}

			return;

		}



		mmc_release_host(host);

		mmc_power_off(host);

	} else {

		if (host->bus_ops->detect && !host->bus_dead)

			host->bus_ops->detect(host);

drivers/mmc/core/sdio.c

0 → 100644
+176 −0
Original line number Diff line number Diff line 
/*

 *  linux/drivers/mmc/sdio.c

 *

 *  Copyright 2006-2007 Pierre Ossman

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or (at

 * your option) any later version.

 */



#include <linux/err.h>



#include <linux/mmc/host.h>

#include <linux/mmc/card.h>



#include "core.h"

#include "bus.h"

#include "mmc_ops.h"

#include "sd_ops.h"

#include "sdio_ops.h"



/*

 * Host is being removed. Free up the current card.

 */

static void mmc_sdio_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_sdio_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_select_card(host->card);



	mmc_release_host(host);



	if (err) {

		mmc_sdio_remove(host);



		mmc_claim_host(host);

		mmc_detach_bus(host);

		mmc_release_host(host);

	}

}





static const struct mmc_bus_ops mmc_sdio_ops = {

	.remove = mmc_sdio_remove,

	.detect = mmc_sdio_detect,

};





/*

 * Starting point for SDIO card init.

 */

int mmc_attach_sdio(struct mmc_host *host, u32 ocr)

{

	int err;

	int funcs;

	struct mmc_card *card;



	BUG_ON(!host);

	BUG_ON(!host->claimed);



	mmc_attach_bus(host, &mmc_sdio_ops);



	/*

	 * 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;

	}



	if (ocr & MMC_VDD_165_195) {

		printk(KERN_WARNING "%s: SDIO 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)?

	 */

	if (!host->ocr) {

		err = -EINVAL;

		goto err;

	}



	/*

	 * Inform the card of the voltage

	 */

	err = mmc_send_io_op_cond(host, host->ocr, &ocr);

	if (err)

		goto err;



	/*

	 * The number of functions on the card is encoded inside

	 * the ocr.

	 */

	funcs = (ocr & 0x70000000) >> 28;



	/*

	 * Allocate card structure.

	 */

	card = mmc_alloc_card(host);

	if (IS_ERR(card)) {

		err = PTR_ERR(card);

		goto err;

	}



	card->type = MMC_TYPE_SDIO;



	/*

	 * Set card RCA.

	 */

	err = mmc_send_relative_addr(host, &card->rca);

	if (err)

		goto free_card;



	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);



	/*

	 * Select card, as all following commands rely on that.

	 */

	err = mmc_select_card(card);

	if (err)

		goto free_card;



	host->card = card;



	mmc_release_host(host);



	err = mmc_add_card(host->card);

	if (err)

		goto reclaim_host;



	return 0;



reclaim_host:

	mmc_claim_host(host);

free_card:

	mmc_remove_card(card);

	host->card = NULL;

err:

	mmc_detach_bus(host);

	mmc_release_host(host);



	printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",

		mmc_hostname(host), err);



	return err;

}