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-74xx-mmio.c (3495B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * 74xx MMIO GPIO driver
      4 *
      5 *  Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
      6 */
      7
      8#include <linux/err.h>
      9#include <linux/module.h>
     10#include <linux/of_device.h>
     11#include <linux/gpio/driver.h>
     12#include <linux/platform_device.h>
     13
     14#define MMIO_74XX_DIR_IN	(0 << 8)
     15#define MMIO_74XX_DIR_OUT	(1 << 8)
     16#define MMIO_74XX_BIT_CNT(x)	((x) & 0xff)
     17
     18struct mmio_74xx_gpio_priv {
     19	struct gpio_chip	gc;
     20	unsigned		flags;
     21};
     22
     23static const struct of_device_id mmio_74xx_gpio_ids[] = {
     24	{
     25		.compatible	= "ti,741g125",
     26		.data		= (const void *)(MMIO_74XX_DIR_IN | 1),
     27	},
     28	{
     29		.compatible	= "ti,742g125",
     30		.data		= (const void *)(MMIO_74XX_DIR_IN | 2),
     31	},
     32	{
     33		.compatible	= "ti,74125",
     34		.data		= (const void *)(MMIO_74XX_DIR_IN | 4),
     35	},
     36	{
     37		.compatible	= "ti,74365",
     38		.data		= (const void *)(MMIO_74XX_DIR_IN | 6),
     39	},
     40	{
     41		.compatible	= "ti,74244",
     42		.data		= (const void *)(MMIO_74XX_DIR_IN | 8),
     43	},
     44	{
     45		.compatible	= "ti,741624",
     46		.data		= (const void *)(MMIO_74XX_DIR_IN | 16),
     47	},
     48	{
     49		.compatible	= "ti,741g74",
     50		.data		= (const void *)(MMIO_74XX_DIR_OUT | 1),
     51	},
     52	{
     53		.compatible	= "ti,7474",
     54		.data		= (const void *)(MMIO_74XX_DIR_OUT | 2),
     55	},
     56	{
     57		.compatible	= "ti,74175",
     58		.data		= (const void *)(MMIO_74XX_DIR_OUT | 4),
     59	},
     60	{
     61		.compatible	= "ti,74174",
     62		.data		= (const void *)(MMIO_74XX_DIR_OUT | 6),
     63	},
     64	{
     65		.compatible	= "ti,74273",
     66		.data		= (const void *)(MMIO_74XX_DIR_OUT | 8),
     67	},
     68	{
     69		.compatible	= "ti,7416374",
     70		.data		= (const void *)(MMIO_74XX_DIR_OUT | 16),
     71	},
     72	{ }
     73};
     74MODULE_DEVICE_TABLE(of, mmio_74xx_gpio_ids);
     75
     76static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset)
     77{
     78	struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
     79
     80	if (priv->flags & MMIO_74XX_DIR_OUT)
     81		return GPIO_LINE_DIRECTION_OUT;
     82
     83	return  GPIO_LINE_DIRECTION_IN;
     84}
     85
     86static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio)
     87{
     88	struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
     89
     90	return (priv->flags & MMIO_74XX_DIR_OUT) ? -ENOTSUPP : 0;
     91}
     92
     93static int mmio_74xx_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
     94{
     95	struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
     96
     97	if (priv->flags & MMIO_74XX_DIR_OUT) {
     98		gc->set(gc, gpio, val);
     99		return 0;
    100	}
    101
    102	return -ENOTSUPP;
    103}
    104
    105static int mmio_74xx_gpio_probe(struct platform_device *pdev)
    106{
    107	struct mmio_74xx_gpio_priv *priv;
    108	void __iomem *dat;
    109	int err;
    110
    111	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
    112	if (!priv)
    113		return -ENOMEM;
    114
    115	priv->flags = (uintptr_t)of_device_get_match_data(&pdev->dev);
    116
    117	dat = devm_platform_ioremap_resource(pdev, 0);
    118	if (IS_ERR(dat))
    119		return PTR_ERR(dat);
    120
    121	err = bgpio_init(&priv->gc, &pdev->dev,
    122			 DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8),
    123			 dat, NULL, NULL, NULL, NULL, 0);
    124	if (err)
    125		return err;
    126
    127	priv->gc.direction_input = mmio_74xx_dir_in;
    128	priv->gc.direction_output = mmio_74xx_dir_out;
    129	priv->gc.get_direction = mmio_74xx_get_direction;
    130	priv->gc.ngpio = MMIO_74XX_BIT_CNT(priv->flags);
    131	priv->gc.owner = THIS_MODULE;
    132
    133	platform_set_drvdata(pdev, priv);
    134
    135	return devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
    136}
    137
    138static struct platform_driver mmio_74xx_gpio_driver = {
    139	.driver	= {
    140		.name		= "74xx-mmio-gpio",
    141		.of_match_table	= mmio_74xx_gpio_ids,
    142	},
    143	.probe	= mmio_74xx_gpio_probe,
    144};
    145module_platform_driver(mmio_74xx_gpio_driver);
    146
    147MODULE_LICENSE("GPL");
    148MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
    149MODULE_DESCRIPTION("74xx MMIO GPIO driver");