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-tn48m.c (2236B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Delta TN48M CPLD GPIO driver
      4 *
      5 * Copyright (C) 2021 Sartura Ltd.
      6 *
      7 * Author: Robert Marko <robert.marko@sartura.hr>
      8 */
      9
     10#include <linux/device.h>
     11#include <linux/gpio/driver.h>
     12#include <linux/gpio/regmap.h>
     13#include <linux/mod_devicetable.h>
     14#include <linux/module.h>
     15#include <linux/platform_device.h>
     16#include <linux/regmap.h>
     17
     18enum tn48m_gpio_type {
     19	TN48M_GP0 = 1,
     20	TN48M_GPI,
     21};
     22
     23struct tn48m_gpio_config {
     24	int ngpio;
     25	int ngpio_per_reg;
     26	enum tn48m_gpio_type type;
     27};
     28
     29static const struct tn48m_gpio_config tn48m_gpo_config = {
     30	.ngpio = 4,
     31	.ngpio_per_reg = 4,
     32	.type = TN48M_GP0,
     33};
     34
     35static const struct tn48m_gpio_config tn48m_gpi_config = {
     36	.ngpio = 4,
     37	.ngpio_per_reg = 4,
     38	.type = TN48M_GPI,
     39};
     40
     41static int tn48m_gpio_probe(struct platform_device *pdev)
     42{
     43	const struct tn48m_gpio_config *gpio_config;
     44	struct gpio_regmap_config config = {};
     45	struct regmap *regmap;
     46	u32 base;
     47	int ret;
     48
     49	if (!pdev->dev.parent)
     50		return -ENODEV;
     51
     52	gpio_config = device_get_match_data(&pdev->dev);
     53	if (!gpio_config)
     54		return -ENODEV;
     55
     56	ret = device_property_read_u32(&pdev->dev, "reg", &base);
     57	if (ret)
     58		return ret;
     59
     60	regmap = dev_get_regmap(pdev->dev.parent, NULL);
     61	if (!regmap)
     62		return -ENODEV;
     63
     64	config.regmap = regmap;
     65	config.parent = &pdev->dev;
     66	config.ngpio = gpio_config->ngpio;
     67	config.ngpio_per_reg = gpio_config->ngpio_per_reg;
     68	switch (gpio_config->type) {
     69	case TN48M_GP0:
     70		config.reg_set_base = base;
     71		break;
     72	case TN48M_GPI:
     73		config.reg_dat_base = base;
     74		break;
     75	default:
     76		return -EINVAL;
     77	}
     78
     79	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
     80}
     81
     82static const struct of_device_id tn48m_gpio_of_match[] = {
     83	{ .compatible = "delta,tn48m-gpo", .data = &tn48m_gpo_config },
     84	{ .compatible = "delta,tn48m-gpi", .data = &tn48m_gpi_config },
     85	{ }
     86};
     87MODULE_DEVICE_TABLE(of, tn48m_gpio_of_match);
     88
     89static struct platform_driver tn48m_gpio_driver = {
     90	.driver = {
     91		.name = "delta-tn48m-gpio",
     92		.of_match_table = tn48m_gpio_of_match,
     93	},
     94	.probe = tn48m_gpio_probe,
     95};
     96module_platform_driver(tn48m_gpio_driver);
     97
     98MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>");
     99MODULE_DESCRIPTION("Delta TN48M CPLD GPIO driver");
    100MODULE_LICENSE("GPL");