cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pwrseq_sd8787.c (3265B)

      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");