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	u32 reset_pwrdwn_delay_ms;
 32};
 33
 34#define to_pwrseq_sd8787(p) container_of(p, struct mmc_pwrseq_sd8787, pwrseq)
 35
 36static void mmc_pwrseq_sd8787_pre_power_on(struct mmc_host *host)
 37{
 38	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
 39
 40	gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);
 41
 42	msleep(pwrseq->reset_pwrdwn_delay_ms);
 43	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1);
 44}
 45
 46static void mmc_pwrseq_sd8787_power_off(struct mmc_host *host)
 47{
 48	struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
 49
 50	gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0);
 51	gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
 52}
 53
 54static const struct mmc_pwrseq_ops mmc_pwrseq_sd8787_ops = {
 55	.pre_power_on = mmc_pwrseq_sd8787_pre_power_on,
 56	.power_off = mmc_pwrseq_sd8787_power_off,
 57};
 58
 59static const u32 sd8787_delay_ms = 300;
 60static const u32 wilc1000_delay_ms = 5;
 61
 62static const struct of_device_id mmc_pwrseq_sd8787_of_match[] = {
 63	{ .compatible = "mmc-pwrseq-sd8787", .data = &sd8787_delay_ms },
 64	{ .compatible = "mmc-pwrseq-wilc1000", .data = &wilc1000_delay_ms },
 65	{/* sentinel */},
 66};
 67MODULE_DEVICE_TABLE(of, mmc_pwrseq_sd8787_of_match);
 68
 69static int mmc_pwrseq_sd8787_probe(struct platform_device *pdev)
 70{
 71	struct mmc_pwrseq_sd8787 *pwrseq;
 72	struct device *dev = &pdev->dev;
 73	const struct of_device_id *match;
 74
 75	pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
 76	if (!pwrseq)
 77		return -ENOMEM;
 78
 79	match = of_match_node(mmc_pwrseq_sd8787_of_match, pdev->dev.of_node);
 80	pwrseq->reset_pwrdwn_delay_ms = *(u32 *)match->data;
 81
 82	pwrseq->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW);
 83	if (IS_ERR(pwrseq->pwrdn_gpio))
 84		return PTR_ERR(pwrseq->pwrdn_gpio);
 85
 86	pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
 87	if (IS_ERR(pwrseq->reset_gpio))
 88		return PTR_ERR(pwrseq->reset_gpio);
 89
 90	pwrseq->pwrseq.dev = dev;
 91	pwrseq->pwrseq.ops = &mmc_pwrseq_sd8787_ops;
 92	pwrseq->pwrseq.owner = THIS_MODULE;
 93	platform_set_drvdata(pdev, pwrseq);
 94
 95	return mmc_pwrseq_register(&pwrseq->pwrseq);
 96}
 97
 98static int mmc_pwrseq_sd8787_remove(struct platform_device *pdev)
 99{
100	struct mmc_pwrseq_sd8787 *pwrseq = platform_get_drvdata(pdev);
101
102	mmc_pwrseq_unregister(&pwrseq->pwrseq);
103
104	return 0;
105}
106
107static struct platform_driver mmc_pwrseq_sd8787_driver = {
108	.probe = mmc_pwrseq_sd8787_probe,
109	.remove = mmc_pwrseq_sd8787_remove,
110	.driver = {
111		.name = "pwrseq_sd8787",
112		.of_match_table = mmc_pwrseq_sd8787_of_match,
113	},
114};
115
116module_platform_driver(mmc_pwrseq_sd8787_driver);
117MODULE_LICENSE("GPL v2");