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de19b4c928
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: Matt Ranostay <matt@ranostay.consulting> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
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* pwrseq_sd8787.c - power sequence support for Marvell SD8787 BT + Wifi chip
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*
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* Copyright (C) 2016 Matt Ranostay <matt@ranostay.consulting>
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*
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* Based on the original work pwrseq_simple.c
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* Copyright (C) 2014 Linaro Ltd
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* Author: Ulf Hansson <ulf.hansson@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/gpio/consumer.h>
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#include <linux/mmc/host.h>
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#include "pwrseq.h"
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struct mmc_pwrseq_sd8787 {
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struct mmc_pwrseq pwrseq;
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struct gpio_desc *reset_gpio;
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struct gpio_desc *pwrdn_gpio;
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};
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#define to_pwrseq_sd8787(p) container_of(p, struct mmc_pwrseq_sd8787, pwrseq)
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static void mmc_pwrseq_sd8787_pre_power_on(struct mmc_host *host)
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{
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struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
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gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);
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msleep(300);
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gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1);
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}
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static void mmc_pwrseq_sd8787_power_off(struct mmc_host *host)
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{
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struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
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gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0);
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gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
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}
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static const struct mmc_pwrseq_ops mmc_pwrseq_sd8787_ops = {
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.pre_power_on = mmc_pwrseq_sd8787_pre_power_on,
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.power_off = mmc_pwrseq_sd8787_power_off,
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};
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static const struct of_device_id mmc_pwrseq_sd8787_of_match[] = {
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{ .compatible = "mmc-pwrseq-sd8787",},
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, mmc_pwrseq_sd8787_of_match);
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static int mmc_pwrseq_sd8787_probe(struct platform_device *pdev)
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{
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struct mmc_pwrseq_sd8787 *pwrseq;
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struct device *dev = &pdev->dev;
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pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
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if (!pwrseq)
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return -ENOMEM;
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pwrseq->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW);
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if (IS_ERR(pwrseq->pwrdn_gpio))
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return PTR_ERR(pwrseq->pwrdn_gpio);
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pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
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if (IS_ERR(pwrseq->reset_gpio))
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return PTR_ERR(pwrseq->reset_gpio);
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pwrseq->pwrseq.dev = dev;
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pwrseq->pwrseq.ops = &mmc_pwrseq_sd8787_ops;
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pwrseq->pwrseq.owner = THIS_MODULE;
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platform_set_drvdata(pdev, pwrseq);
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return mmc_pwrseq_register(&pwrseq->pwrseq);
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}
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static int mmc_pwrseq_sd8787_remove(struct platform_device *pdev)
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{
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struct mmc_pwrseq_sd8787 *pwrseq = platform_get_drvdata(pdev);
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mmc_pwrseq_unregister(&pwrseq->pwrseq);
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return 0;
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}
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static struct platform_driver mmc_pwrseq_sd8787_driver = {
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.probe = mmc_pwrseq_sd8787_probe,
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.remove = mmc_pwrseq_sd8787_remove,
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.driver = {
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.name = "pwrseq_sd8787",
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.of_match_table = mmc_pwrseq_sd8787_of_match,
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},
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};
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module_platform_driver(mmc_pwrseq_sd8787_driver);
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MODULE_LICENSE("GPL v2");
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