135 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * pwrseq_sd8787.c - power sequence support for Marvell SD8787 BT + Wifi chip4 *5 * Copyright (C) 2016 Matt Ranostay <matt@ranostay.consulting>6 *7 * Based on the original work pwrseq_simple.c8 * Copyright (C) 2014 Linaro Ltd9 * 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_DESCRIPTION("Power sequence support for Marvell SD8787 BT + Wifi chip");134MODULE_LICENSE("GPL v2");135