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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gpio-rc5t583.c (4083B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * GPIO driver for RICOH583 power management chip.
      4 *
      5 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
      6 * Author: Laxman dewangan <ldewangan@nvidia.com>
      7 *
      8 * Based on code
      9 *	Copyright (C) 2011 RICOH COMPANY,LTD
     10 */
     11#include <linux/init.h>
     12#include <linux/kernel.h>
     13#include <linux/slab.h>
     14#include <linux/platform_device.h>
     15#include <linux/device.h>
     16#include <linux/gpio/driver.h>
     17#include <linux/mfd/rc5t583.h>
     18
     19struct rc5t583_gpio {
     20	struct gpio_chip gpio_chip;
     21	struct rc5t583 *rc5t583;
     22};
     23
     24static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)
     25{
     26	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
     27	struct device *parent = rc5t583_gpio->rc5t583->dev;
     28	uint8_t val = 0;
     29	int ret;
     30
     31	ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val);
     32	if (ret < 0)
     33		return ret;
     34
     35	return !!(val & BIT(offset));
     36}
     37
     38static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
     39{
     40	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
     41	struct device *parent = rc5t583_gpio->rc5t583->dev;
     42	if (val)
     43		rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
     44	else
     45		rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
     46}
     47
     48static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
     49{
     50	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
     51	struct device *parent = rc5t583_gpio->rc5t583->dev;
     52	int ret;
     53
     54	ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
     55	if (ret < 0)
     56		return ret;
     57
     58	/* Set pin to gpio mode */
     59	return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
     60}
     61
     62static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset,
     63			int value)
     64{
     65	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
     66	struct device *parent = rc5t583_gpio->rc5t583->dev;
     67	int ret;
     68
     69	rc5t583_gpio_set(gc, offset, value);
     70	ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
     71	if (ret < 0)
     72		return ret;
     73
     74	/* Set pin to gpio mode */
     75	return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
     76}
     77
     78static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
     79{
     80	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
     81
     82	if (offset < RC5T583_MAX_GPIO)
     83		return rc5t583_gpio->rc5t583->irq_base +
     84				RC5T583_IRQ_GPIO0 + offset;
     85	return -EINVAL;
     86}
     87
     88static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset)
     89{
     90	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
     91	struct device *parent = rc5t583_gpio->rc5t583->dev;
     92
     93	rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
     94}
     95
     96static int rc5t583_gpio_probe(struct platform_device *pdev)
     97{
     98	struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
     99	struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
    100	struct rc5t583_gpio *rc5t583_gpio;
    101
    102	rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio),
    103					GFP_KERNEL);
    104	if (!rc5t583_gpio)
    105		return -ENOMEM;
    106
    107	rc5t583_gpio->gpio_chip.label = "gpio-rc5t583",
    108	rc5t583_gpio->gpio_chip.owner = THIS_MODULE,
    109	rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free,
    110	rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input,
    111	rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output,
    112	rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set,
    113	rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get,
    114	rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq,
    115	rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO,
    116	rc5t583_gpio->gpio_chip.can_sleep = true,
    117	rc5t583_gpio->gpio_chip.parent = &pdev->dev;
    118	rc5t583_gpio->gpio_chip.base = -1;
    119	rc5t583_gpio->rc5t583 = rc5t583;
    120
    121	if (pdata && pdata->gpio_base)
    122		rc5t583_gpio->gpio_chip.base = pdata->gpio_base;
    123
    124	platform_set_drvdata(pdev, rc5t583_gpio);
    125
    126	return devm_gpiochip_add_data(&pdev->dev, &rc5t583_gpio->gpio_chip,
    127				      rc5t583_gpio);
    128}
    129
    130static struct platform_driver rc5t583_gpio_driver = {
    131	.driver = {
    132		.name    = "rc5t583-gpio",
    133	},
    134	.probe		= rc5t583_gpio_probe,
    135};
    136
    137static int __init rc5t583_gpio_init(void)
    138{
    139	return platform_driver_register(&rc5t583_gpio_driver);
    140}
    141subsys_initcall(rc5t583_gpio_init);