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Commit 15a0580c authored by David Brownell's avatar David Brownell Committed by Pierre Ossman
Browse files

mmc_spi host driver 



This is the latest version of the MMC-over-SPI support.  It works
on 2.6.23-rc2 plus git-mmc (from rc1-mm2), along with the preceding
patches which teach the rest of the MMC stack about SPI.

The main issue of note is that sometimes cards need to be power cycled
to recover after certain faults.  Also, it may sometimes be necessary
to disable CRCs.  ("modprobe mmc_core use_spi_crc=n")

Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Cc: mikael.starvik@axis.com,
Cc: Hans-Peter Nilsson <hp@axis.com>
Cc: Jan Nikitenko <jan.nikitenko@gmail.com>
Cc: Mike Lavender <mike@steroidmicros.com>
Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
parent af517150

MAINTAINERS

+6 −0
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@@ -2567,6 +2567,12 @@ M: drzeus-mmc@drzeus.cx 
L:	linux-kernel@vger.kernel.org

S:	Maintained



MULTIMEDIA CARD (MMC) ETC. OVER SPI

P:	David Brownell

M:	dbrownell@users.sourceforge.net

L:	linux-kernel@vger.kernel.org

S:	Odd fixes



MULTISOUND SOUND DRIVER

P:	Andrew Veliath

M:	andrewtv@usa.net

drivers/mmc/host/Kconfig

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@@ -100,3 +100,16 @@ config MMC_TIFM_SD 
          To compile this driver as a module, choose M here: the

	  module will be called tifm_sd.



config MMC_SPI

	tristate "MMC/SD over SPI (EXPERIMENTAL)"

	depends on MMC && SPI_MASTER && !HIGHMEM && EXPERIMENTAL

	select CRC7

	select CRC_ITU_T

	help

	  Some systems accss MMC/SD cards using a SPI controller instead of

	  using a "native" MMC/SD controller.  This has a disadvantage of

	  being relatively high overhead, but a compensating advantage of

	  working on many systems without dedicated MMC/SD controllers.



	  If unsure, or if your system has no SPI master driver, say N.

drivers/mmc/host/Makefile

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@@ -15,4 +15,5 @@ obj-$(CONFIG_MMC_AU1X) += au1xmmc.o 
obj-$(CONFIG_MMC_OMAP)		+= omap.o

obj-$(CONFIG_MMC_AT91)		+= at91_mci.o

obj-$(CONFIG_MMC_TIFM_SD)	+= tifm_sd.o

obj-$(CONFIG_MMC_SPI)		+= mmc_spi.o

drivers/mmc/host/mmc_spi.c

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include/linux/spi/mmc_spi.h

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#ifndef __LINUX_SPI_MMC_SPI_H

#define __LINUX_SPI_MMC_SPI_H



struct device;

struct mmc_host;



/* Put this in platform_data of a device being used to manage an MMC/SD

 * card slot.  (Modeled after PXA mmc glue; see that for usage examples.)

 *

 * REVISIT This is not a spi-specific notion.  Any card slot should be

 * able to handle it.  If the MMC core doesn't adopt this kind of notion,

 * switch the "struct device *" parameters over to "struct spi_device *".

 */

struct mmc_spi_platform_data {

	/* driver activation and (optional) card detect irq hookup */

	int (*init)(struct device *,

		irqreturn_t (*)(int, void *),

		void *);

	void (*exit)(struct device *, void *);



	/* sense switch on sd cards */

	int (*get_ro)(struct device *);



	/* how long to debounce card detect, in msecs */

	u16 detect_delay;



	/* power management */

	u16 powerup_msecs;		/* delay of up to 250 msec */

	u32 ocr_mask;			/* available voltages */

	void (*setpower)(struct device *, unsigned int maskval);

};



#endif /* __LINUX_SPI_MMC_SPI_H */