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Commit 2b6be3a2 authored by San Mehat's avatar San Mehat Committed by Dmitry Shmidt
Browse files

ANDROID: mmc: Add concept of an 'embedded' SDIO device. 



This is required to support chips which use SDIO for signaling/
communication but do not implement the various card enumeration registers
as required for full SD / SDIO cards.

mmc: sdio: Fix bug where we're freeing the CIS tables we never allocated when using EMBEDDED_SDIO
mmc: Add max_blksize to embedded SDIO data

Change-Id: Ibff2e3e991e5522f55ec8c6edc25ed09f2553736
Signed-off-by: default avatarSan Mehat <san@google.com>
parent 0a3f5620

drivers/mmc/core/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -23,8 +23,17 @@ config PWRSEQ_SIMPLE 
	  This driver can also be built as a module. If so, the module

	  will be called pwrseq_simple.



config MMC_EMBEDDED_SDIO

	boolean "MMC embedded SDIO device support (EXPERIMENTAL)"

	depends on EXPERIMENTAL

	help

	  If you say Y here, support will be added for embedded SDIO

	  devices which do not contain the necessary enumeration

	  support in hardware to be properly detected.



config MMC_PARANOID_SD_INIT

	bool "Enable paranoid SD card initialization (EXPERIMENTAL)"

	depends on EXPERIMENTAL

	help

	  If you say Y here, the MMC layer will be extra paranoid

	  about re-trying SD init requests. This can be a useful

drivers/mmc/core/core.c

+16 −0
Original line number Diff line number Diff line
@@ -3026,6 +3026,22 @@ void mmc_init_context_info(struct mmc_host *host) 
	init_waitqueue_head(&host->context_info.wait);

}



#ifdef CONFIG_MMC_EMBEDDED_SDIO

void mmc_set_embedded_sdio_data(struct mmc_host *host,

				struct sdio_cis *cis,

				struct sdio_cccr *cccr,

				struct sdio_embedded_func *funcs,

				int num_funcs)

{

	host->embedded_sdio_data.cis = cis;

	host->embedded_sdio_data.cccr = cccr;

	host->embedded_sdio_data.funcs = funcs;

	host->embedded_sdio_data.num_funcs = num_funcs;

}



EXPORT_SYMBOL(mmc_set_embedded_sdio_data);

#endif



static int __init mmc_init(void)

{

	int ret;

drivers/mmc/core/sdio.c

+58 −16
Original line number Diff line number Diff line
@@ -28,6 +28,10 @@ 
#include "sdio_ops.h"

#include "sdio_cis.h"



#ifdef CONFIG_MMC_EMBEDDED_SDIO

#include <linux/mmc/sdio_ids.h>

#endif



static int sdio_read_fbr(struct sdio_func *func)

{

	int ret;
@@ -697,19 +701,35 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, 
		goto finish;

	}



#ifdef CONFIG_MMC_EMBEDDED_SDIO

	if (host->embedded_sdio_data.cccr)

		memcpy(&card->cccr, host->embedded_sdio_data.cccr, sizeof(struct sdio_cccr));

	else {

#endif

		/*

		 * Read the common registers.

		 */

		err = sdio_read_cccr(card,  ocr);

		if (err)

			goto remove;

#ifdef CONFIG_MMC_EMBEDDED_SDIO

	}

#endif



#ifdef CONFIG_MMC_EMBEDDED_SDIO

	if (host->embedded_sdio_data.cis)

		memcpy(&card->cis, host->embedded_sdio_data.cis, sizeof(struct sdio_cis));

	else {

#endif

		/*

		 * Read the common CIS tuples.

		 */

		err = sdio_read_common_cis(card);

		if (err)

			goto remove;

#ifdef CONFIG_MMC_EMBEDDED_SDIO

	}

#endif



	if (oldcard) {

		int same = (card->cis.vendor == oldcard->cis.vendor &&
@@ -1118,14 +1138,36 @@ int mmc_attach_sdio(struct mmc_host *host) 
	funcs = (ocr & 0x70000000) >> 28;

	card->sdio_funcs = 0;



#ifdef CONFIG_MMC_EMBEDDED_SDIO

	if (host->embedded_sdio_data.funcs)

		card->sdio_funcs = funcs = host->embedded_sdio_data.num_funcs;

#endif



	/*

	 * Initialize (but don't add) all present functions.

	 */

	for (i = 0; i < funcs; i++, card->sdio_funcs++) {

#ifdef CONFIG_MMC_EMBEDDED_SDIO

		if (host->embedded_sdio_data.funcs) {

			struct sdio_func *tmp;



			tmp = sdio_alloc_func(host->card);

			if (IS_ERR(tmp))

				goto remove;

			tmp->num = (i + 1);

			card->sdio_func[i] = tmp;

			tmp->class = host->embedded_sdio_data.funcs[i].f_class;

			tmp->max_blksize = host->embedded_sdio_data.funcs[i].f_maxblksize;

			tmp->vendor = card->cis.vendor;

			tmp->device = card->cis.device;

		} else {

#endif

			err = sdio_init_func(host->card, i + 1);

			if (err)

				goto remove;



#ifdef CONFIG_MMC_EMBEDDED_SDIO

		}

#endif

		/*

		 * Enable Runtime PM for this func (if supported)

		 */

drivers/mmc/core/sdio_bus.c

+12 −1
Original line number Diff line number Diff line
@@ -28,6 +28,10 @@ 
#include "sdio_cis.h"

#include "sdio_bus.h"



#ifdef CONFIG_MMC_EMBEDDED_SDIO

#include <linux/mmc/host.h>

#endif



#define to_sdio_driver(d)	container_of(d, struct sdio_driver, drv)



/* show configuration fields */
@@ -263,6 +267,13 @@ static void sdio_release_func(struct device *dev) 
{

	struct sdio_func *func = dev_to_sdio_func(dev);



#ifdef CONFIG_MMC_EMBEDDED_SDIO

	/*

	 * If this device is embedded then we never allocated

	 * cis tables for this func

	 */

	if (!func->card->host->embedded_sdio_data.funcs)

#endif

		sdio_free_func_cis(func);



	kfree(func->info);

include/linux/amba/mmci.h

+10 −0
Original line number Diff line number Diff line
@@ -5,6 +5,15 @@ 
#define AMBA_MMCI_H



#include <linux/mmc/host.h>

#include <linux/mmc/card.h>

#include <linux/mmc/sdio_func.h>



struct embedded_sdio_data {

        struct sdio_cis cis;

        struct sdio_cccr cccr;

        struct sdio_embedded_func *funcs;

        int num_funcs;

};



/**

 * struct mmci_platform_data - platform configuration for the MMCI
@@ -31,6 +40,7 @@ struct mmci_platform_data { 
	int	gpio_wp;

	int	gpio_cd;

	bool	cd_invert;

	struct embedded_sdio_data *embedded_sdio;

};



#endif