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Commit de19b4c9 authored by Matt Ranostay's avatar Matt Ranostay Committed by Ulf Hansson
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mmc: pwrseq: add support for Marvell SD8787 chip 



Allow power sequencing for the Marvell SD8787 Wifi/BT chip.
This can be abstracted to other chipsets if needed in the future.

Cc: Tony Lindgren <tony@atomide.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarMatt Ranostay <matt@ranostay.consulting>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent e3fffc1f

drivers/mmc/core/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -12,6 +12,16 @@ config PWRSEQ_EMMC 
	  This driver can also be built as a module. If so, the module

	  will be called pwrseq_emmc.



config PWRSEQ_SD8787

	tristate "HW reset support for SD8787 BT + Wifi module"

	depends on OF && (MWIFIEX || BT_MRVL_SDIO)

	help

	  This selects hardware reset support for the SD8787 BT + Wifi

	  module. By default this option is set to n.



	  This driver can also be built as a module. If so, the module

	  will be called pwrseq_sd8787.



config PWRSEQ_SIMPLE

	tristate "Simple HW reset support for MMC"

	default y

drivers/mmc/core/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ mmc_core-y := core.o bus.o host.o \ 
				   quirks.o slot-gpio.o

mmc_core-$(CONFIG_OF)		+= pwrseq.o

obj-$(CONFIG_PWRSEQ_SIMPLE)	+= pwrseq_simple.o

obj-$(CONFIG_PWRSEQ_SD8787)	+= pwrseq_sd8787.o

obj-$(CONFIG_PWRSEQ_EMMC)	+= pwrseq_emmc.o

mmc_core-$(CONFIG_DEBUG_FS)	+= debugfs.o

obj-$(CONFIG_MMC_BLOCK)		+= mmc_block.o

drivers/mmc/core/pwrseq_sd8787.c

0 → 100644
+117 −0
Original line number Diff line number Diff line 
/*

 * pwrseq_sd8787.c - power sequence support for Marvell SD8787 BT + Wifi chip

 *

 * Copyright (C) 2016 Matt Ranostay <matt@ranostay.consulting>

 *

 * Based on the original work pwrseq_simple.c

 *  Copyright (C) 2014 Linaro Ltd

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

 *

 * 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.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 */



#include <linux/delay.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/platform_device.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/device.h>

#include <linux/err.h>

#include <linux/gpio/consumer.h>



#include <linux/mmc/host.h>



#include "pwrseq.h"



struct mmc_pwrseq_sd8787 {

	struct mmc_pwrseq pwrseq;

	struct gpio_desc *reset_gpio;

	struct gpio_desc *pwrdn_gpio;

};



#define to_pwrseq_sd8787(p) container_of(p, struct mmc_pwrseq_sd8787, pwrseq)



static void mmc_pwrseq_sd8787_pre_power_on(struct mmc_host *host)

{

	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);



	gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);



	msleep(300);

	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1);

}



static void mmc_pwrseq_sd8787_power_off(struct mmc_host *host)

{

	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);



	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0);

	gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);

}



static const struct mmc_pwrseq_ops mmc_pwrseq_sd8787_ops = {

	.pre_power_on = mmc_pwrseq_sd8787_pre_power_on,

	.power_off = mmc_pwrseq_sd8787_power_off,

};



static const struct of_device_id mmc_pwrseq_sd8787_of_match[] = {

	{ .compatible = "mmc-pwrseq-sd8787",},

	{/* sentinel */},

};

MODULE_DEVICE_TABLE(of, mmc_pwrseq_sd8787_of_match);



static int mmc_pwrseq_sd8787_probe(struct platform_device *pdev)

{

	struct mmc_pwrseq_sd8787 *pwrseq;

	struct device *dev = &pdev->dev;



	pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);

	if (!pwrseq)

		return -ENOMEM;



	pwrseq->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW);

	if (IS_ERR(pwrseq->pwrdn_gpio))

		return PTR_ERR(pwrseq->pwrdn_gpio);



	pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);

	if (IS_ERR(pwrseq->reset_gpio))

		return PTR_ERR(pwrseq->reset_gpio);



	pwrseq->pwrseq.dev = dev;

	pwrseq->pwrseq.ops = &mmc_pwrseq_sd8787_ops;

	pwrseq->pwrseq.owner = THIS_MODULE;

	platform_set_drvdata(pdev, pwrseq);



	return mmc_pwrseq_register(&pwrseq->pwrseq);

}



static int mmc_pwrseq_sd8787_remove(struct platform_device *pdev)

{

	struct mmc_pwrseq_sd8787 *pwrseq = platform_get_drvdata(pdev);



	mmc_pwrseq_unregister(&pwrseq->pwrseq);



	return 0;

}



static struct platform_driver mmc_pwrseq_sd8787_driver = {

	.probe = mmc_pwrseq_sd8787_probe,

	.remove = mmc_pwrseq_sd8787_remove,

	.driver = {

		.name = "pwrseq_sd8787",

		.of_match_table = mmc_pwrseq_sd8787_of_match,

	},

};



module_platform_driver(mmc_pwrseq_sd8787_driver);

MODULE_LICENSE("GPL v2");