1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * pwrseq_sd8787.c - power sequence support for Marvell SD8787 BT + Wifi chip
  4 *
  5 * Copyright (C) 2016 Matt Ranostay <matt@ranostay.consulting>
  6 *
  7 * Based on the original work pwrseq_simple.c
  8 *  Copyright (C) 2014 Linaro Ltd
  9 *  Author: Ulf Hansson <ulf.hansson@linaro.org>
 10 */
 11
 12#include <linux/delay.h>
 13#include <linux/init.h>
 14#include <linux/kernel.h>
 15#include <linux/platform_device.h>
 16#include <linux/module.h>
 17#include <linux/of.h>
 18#include <linux/slab.h>
 19#include <linux/device.h>
 20#include <linux/err.h>
 21#include <linux/gpio/consumer.h>
 22
 23#include <linux/mmc/host.h>
 24
 25#include "pwrseq.h"
 26
 27struct mmc_pwrseq_sd8787 {
 28	struct mmc_pwrseq pwrseq;
 29	struct gpio_desc *reset_gpio;
 30	struct gpio_desc *pwrdn_gpio;
 31};
 32
 33#define to_pwrseq_sd8787(p) container_of(p, struct mmc_pwrseq_sd8787, pwrseq)
 34
 35static void mmc_pwrseq_sd8787_pre_power_on(struct mmc_host *host)
 36{
 37	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
 38
 39	gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);
 40
 41	msleep(300);
 42	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1);
 43}
 44
 45static void mmc_pwrseq_sd8787_power_off(struct mmc_host *host)
 46{
 47	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
 48
 49	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0);
 50	gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
 51}
 52
 53static void mmc_pwrseq_wilc1000_pre_power_on(struct mmc_host *host)
 54{
 55	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
 56
 57	/* The pwrdn_gpio is really CHIP_EN, reset_gpio is RESETN */
 58	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1);
 59	msleep(5);
 60	gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);
 61}
 62
 63static void mmc_pwrseq_wilc1000_power_off(struct mmc_host *host)
 64{
 65	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
 66
 67	gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
 68	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0);
 69}
 70
 71static const struct mmc_pwrseq_ops mmc_pwrseq_sd8787_ops = {
 72	.pre_power_on = mmc_pwrseq_sd8787_pre_power_on,
 73	.power_off = mmc_pwrseq_sd8787_power_off,
 74};
 75
 76static const struct mmc_pwrseq_ops mmc_pwrseq_wilc1000_ops = {
 77	.pre_power_on = mmc_pwrseq_wilc1000_pre_power_on,
 78	.power_off = mmc_pwrseq_wilc1000_power_off,
 79};
 80
 81static const struct of_device_id mmc_pwrseq_sd8787_of_match[] = {
 82	{ .compatible = "mmc-pwrseq-sd8787", .data = &mmc_pwrseq_sd8787_ops },
 83	{ .compatible = "mmc-pwrseq-wilc1000", .data = &mmc_pwrseq_wilc1000_ops },
 84	{/* sentinel */},
 85};
 86MODULE_DEVICE_TABLE(of, mmc_pwrseq_sd8787_of_match);
 87
 88static int mmc_pwrseq_sd8787_probe(struct platform_device *pdev)
 89{
 90	struct mmc_pwrseq_sd8787 *pwrseq;
 91	struct device *dev = &pdev->dev;
 92	const struct of_device_id *match;
 93
 94	pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
 95	if (!pwrseq)
 96		return -ENOMEM;
 97
 98	match = of_match_node(mmc_pwrseq_sd8787_of_match, pdev->dev.of_node);
 99
100	pwrseq->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW);
101	if (IS_ERR(pwrseq->pwrdn_gpio))
102		return PTR_ERR(pwrseq->pwrdn_gpio);
103
104	pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
105	if (IS_ERR(pwrseq->reset_gpio))
106		return PTR_ERR(pwrseq->reset_gpio);
107
108	pwrseq->pwrseq.dev = dev;
109	pwrseq->pwrseq.ops = match->data;
110	pwrseq->pwrseq.owner = THIS_MODULE;
111	platform_set_drvdata(pdev, pwrseq);
112
113	return mmc_pwrseq_register(&pwrseq->pwrseq);
114}
115
116static void mmc_pwrseq_sd8787_remove(struct platform_device *pdev)
117{
118	struct mmc_pwrseq_sd8787 *pwrseq = platform_get_drvdata(pdev);
119
120	mmc_pwrseq_unregister(&pwrseq->pwrseq);
121}
122
123static struct platform_driver mmc_pwrseq_sd8787_driver = {
124	.probe = mmc_pwrseq_sd8787_probe,
125	.remove_new = mmc_pwrseq_sd8787_remove,
126	.driver = {
127		.name = "pwrseq_sd8787",
128		.of_match_table = mmc_pwrseq_sd8787_of_match,
129	},
130};
131
132module_platform_driver(mmc_pwrseq_sd8787_driver);
133MODULE_LICENSE("GPL v2");