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Commit 46f555f2 authored by Pierre Ossman's avatar Pierre Ossman
Browse files

mmc: add basic SDIO I/O operations 



Add command wrappers that simplify register access from SDIO
function drivers.

Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
parent f76c8515

drivers/mmc/core/Makefile

+2 −1
Original line number Original line Diff line number Diff line
@@ -9,5 +9,6 @@ endif 
obj-$(CONFIG_MMC)		+= mmc_core.o

obj-$(CONFIG_MMC)		+= mmc_core.o

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

				   sdio.o sdio_ops.o sdio_bus.o \

				   sdio_io.o

drivers/mmc/core/sdio_io.c

0 → 100644
+105 −0
Original line number Original line Diff line number Diff line 
/*

 *  linux/drivers/mmc/core/sdio_io.c

 *

 *  Copyright 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/mmc/host.h>

#include <linux/mmc/card.h>

#include <linux/mmc/sdio_func.h>



#include "sdio_ops.h"



/**

 *	sdio_claim_host - exclusively claim a bus for a certain SDIO function

 *	@func: SDIO function that will be accessed

 *

 *	Claim a bus for a set of operations. The SDIO function given

 *	is used to figure out which bus is relevant.

 */

void sdio_claim_host(struct sdio_func *func)

{

	BUG_ON(!func);

	BUG_ON(!func->card);



	mmc_claim_host(func->card->host);

}

EXPORT_SYMBOL_GPL(sdio_claim_host);



/**

 *	sdio_release_host - release a bus for a certain SDIO function

 *	@func: SDIO function that was accessed

 *

 *	Release a bus, allowing others to claim the bus for their

 *	operations.

 */

void sdio_release_host(struct sdio_func *func)

{

	BUG_ON(!func);

	BUG_ON(!func->card);



	mmc_release_host(func->card->host);

}

EXPORT_SYMBOL_GPL(sdio_release_host);



/**

 *	sdio_readb - read a single byte from a SDIO function

 *	@func: SDIO function to access

 *	@addr: address to read

 *	@err_ret: optional status value from transfer

 *

 *	Reads a single byte from the address space of a given SDIO

 *	function. If there is a problem reading the address, 0xff

 *	is returned and @err_ret will contain the error code.

 */

unsigned char sdio_readb(struct sdio_func *func, unsigned int addr,

	int *err_ret)

{

	int ret;

	unsigned char val;



	BUG_ON(!func);



	if (err_ret)

		*err_ret = 0;



	ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val);

	if (ret) {

		if (err_ret)

			*err_ret = ret;

		return 0xFF;

	}



	return val;

}

EXPORT_SYMBOL_GPL(sdio_readb);



/**

 *	sdio_writeb - write a single byte to a SDIO function

 *	@func: SDIO function to access

 *	@b: byte to write

 *	@addr: address to write to

 *	@err_ret: optional status value from transfer

 *

 *	Writes a single byte to the address space of a given SDIO

 *	function. @err_ret will contain the status of the actual

 *	transfer.

 */

void sdio_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,

	int *err_ret)

{

	int ret;



	BUG_ON(!func);



	ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL);

	if (err_ret)

		*err_ret = ret;

}

EXPORT_SYMBOL_GPL(sdio_writeb);

include/linux/mmc/sdio_func.h

+12 −0
Original line number Original line Diff line number Diff line
@@ -49,5 +49,17 @@ struct sdio_driver { 
extern int sdio_register_driver(struct sdio_driver *);

extern int sdio_register_driver(struct sdio_driver *);

extern void sdio_unregister_driver(struct sdio_driver *);

extern void sdio_unregister_driver(struct sdio_driver *);





/*

 * SDIO I/O operations

 */

extern void sdio_claim_host(struct sdio_func *func);

extern void sdio_release_host(struct sdio_func *func);



extern unsigned char sdio_readb(struct sdio_func *func,

	unsigned int addr, int *err_ret);



extern void sdio_writeb(struct sdio_func *func, unsigned char b,

	unsigned int addr, int *err_ret);



#endif

#endif