Commit 8c96f89c authored by Ulf Hansson's avatar Ulf Hansson
Browse files

mmc: pwrseq: Initial support for the simple MMC power sequence provider 



To add the core part for the MMC power sequence, let's start by adding
initial support for the simple MMC power sequence provider.

In this initial step, the MMC power sequence node are fetched and the
compatible string for the simple MMC power sequence provider are
verified.

At this point we don't parse the node for any properties, but instead
that will be handled from following patches. Since there are no
properties supported yet, let's just implement the ->alloc() and the
->free() callbacks.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Tested-by: default avatarJavier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: default avatarJavier Martinez Canillas <javier.martinez@collabora.co.uk>
parent 0e6d6332

drivers/mmc/core/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -8,5 +8,5 @@ mmc_core-y := core.o bus.o host.o \ 
				   sdio.o sdio_ops.o sdio_bus.o \

				   sdio_cis.o sdio_io.o sdio_irq.o \

				   quirks.o slot-gpio.o

mmc_core-$(CONFIG_OF)		+= pwrseq.o

mmc_core-$(CONFIG_OF)		+= pwrseq.o pwrseq_simple.o

mmc_core-$(CONFIG_DEBUG_FS)	+= debugfs.o

drivers/mmc/core/pwrseq.c

+60 −1
Original line number Diff line number Diff line
@@ -7,14 +7,73 @@ 
 *

 *  MMC power sequence management

 */

#include <linux/kernel.h>

#include <linux/platform_device.h>

#include <linux/err.h>

#include <linux/of.h>

#include <linux/of_platform.h>



#include <linux/mmc/host.h>



#include "pwrseq.h"



struct mmc_pwrseq_match {

	const char *compatible;

	int (*alloc)(struct mmc_host *host, struct device *dev);

};



static struct mmc_pwrseq_match pwrseq_match[] = {

	{

		.compatible = "mmc-pwrseq-simple",

		.alloc = mmc_pwrseq_simple_alloc,

	},

};



static struct mmc_pwrseq_match *mmc_pwrseq_find(struct device_node *np)

{

	struct mmc_pwrseq_match *match = ERR_PTR(-ENODEV);

	int i;



	for (i = 0; i < ARRAY_SIZE(pwrseq_match); i++) {

		if (of_device_is_compatible(np,	pwrseq_match[i].compatible)) {

			match = &pwrseq_match[i];

			break;

		}

	}



	return match;

}



int mmc_pwrseq_alloc(struct mmc_host *host)

{

	struct platform_device *pdev;

	struct device_node *np;

	struct mmc_pwrseq_match *match;

	int ret = 0;



	np = of_parse_phandle(host->parent->of_node, "mmc-pwrseq", 0);

	if (!np)

		return 0;



	pdev = of_find_device_by_node(np);

	if (!pdev) {

		ret = -ENODEV;

		goto err;

	}



	match = mmc_pwrseq_find(np);

	if (IS_ERR(match)) {

		ret = PTR_ERR(match);

		goto err;

	}



	ret = match->alloc(host, &pdev->dev);

	if (!ret)

		dev_info(host->parent, "allocated mmc-pwrseq\n");



err:

	of_node_put(np);

	return ret;

}



void mmc_pwrseq_pre_power_on(struct mmc_host *host)

drivers/mmc/core/pwrseq.h

+2 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ void mmc_pwrseq_post_power_on(struct mmc_host *host); 
void mmc_pwrseq_power_off(struct mmc_host *host);

void mmc_pwrseq_free(struct mmc_host *host);



int mmc_pwrseq_simple_alloc(struct mmc_host *host, struct device *dev);



#else



static inline int mmc_pwrseq_alloc(struct mmc_host *host) { return 0; }

drivers/mmc/core/pwrseq_simple.c

0 → 100644
+48 −0
Original line number Diff line number Diff line 
/*

 *  Copyright (C) 2014 Linaro Ltd

 *

 * Author: Ulf Hansson <ulf.hansson@linaro.org>

 *

 * License terms: GNU General Public License (GPL) version 2

 *

 *  Simple MMC power sequence management

 */

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/device.h>

#include <linux/err.h>



#include <linux/mmc/host.h>



#include "pwrseq.h"



struct mmc_pwrseq_simple {

	struct mmc_pwrseq pwrseq;

};



static void mmc_pwrseq_simple_free(struct mmc_host *host)

{

	struct mmc_pwrseq_simple *pwrseq = container_of(host->pwrseq,

					struct mmc_pwrseq_simple, pwrseq);



	kfree(pwrseq);

	host->pwrseq = NULL;

}



static struct mmc_pwrseq_ops mmc_pwrseq_simple_ops = {

	.free = mmc_pwrseq_simple_free,

};



int mmc_pwrseq_simple_alloc(struct mmc_host *host, struct device *dev)

{

	struct mmc_pwrseq_simple *pwrseq;



	pwrseq = kzalloc(sizeof(struct mmc_pwrseq_simple), GFP_KERNEL);

	if (!pwrseq)

		return -ENOMEM;



	pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops;

	host->pwrseq = &pwrseq->pwrseq;



	return 0;

}

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