mirror of https://gitee.com/openkylin/linux.git
151 lines
3.6 KiB
C
151 lines
3.6 KiB
C
/*
|
|
* 74xx MMIO GPIO driver
|
|
*
|
|
* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#define MMIO_74XX_DIR_IN (0 << 8)
|
|
#define MMIO_74XX_DIR_OUT (1 << 8)
|
|
#define MMIO_74XX_BIT_CNT(x) ((x) & 0xff)
|
|
|
|
struct mmio_74xx_gpio_priv {
|
|
struct gpio_chip gc;
|
|
unsigned flags;
|
|
};
|
|
|
|
static const struct of_device_id mmio_74xx_gpio_ids[] = {
|
|
{
|
|
.compatible = "ti,741g125",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 1),
|
|
},
|
|
{
|
|
.compatible = "ti,742g125",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 2),
|
|
},
|
|
{
|
|
.compatible = "ti,74125",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 4),
|
|
},
|
|
{
|
|
.compatible = "ti,74365",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 6),
|
|
},
|
|
{
|
|
.compatible = "ti,74244",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 8),
|
|
},
|
|
{
|
|
.compatible = "ti,741624",
|
|
.data = (const void *)(MMIO_74XX_DIR_IN | 16),
|
|
},
|
|
{
|
|
.compatible = "ti,741g74",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 1),
|
|
},
|
|
{
|
|
.compatible = "ti,7474",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 2),
|
|
},
|
|
{
|
|
.compatible = "ti,74175",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 4),
|
|
},
|
|
{
|
|
.compatible = "ti,74174",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 6),
|
|
},
|
|
{
|
|
.compatible = "ti,74273",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 8),
|
|
},
|
|
{
|
|
.compatible = "ti,7416374",
|
|
.data = (const void *)(MMIO_74XX_DIR_OUT | 16),
|
|
},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, mmio_74xx_gpio_ids);
|
|
|
|
static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
|
|
|
|
return !(priv->flags & MMIO_74XX_DIR_OUT);
|
|
}
|
|
|
|
static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio)
|
|
{
|
|
struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
|
|
|
|
return (priv->flags & MMIO_74XX_DIR_OUT) ? -ENOTSUPP : 0;
|
|
}
|
|
|
|
static int mmio_74xx_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
|
|
{
|
|
struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
|
|
|
|
if (priv->flags & MMIO_74XX_DIR_OUT) {
|
|
gc->set(gc, gpio, val);
|
|
return 0;
|
|
}
|
|
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static int mmio_74xx_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct mmio_74xx_gpio_priv *priv;
|
|
void __iomem *dat;
|
|
int err;
|
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->flags = (uintptr_t)of_device_get_match_data(&pdev->dev);
|
|
|
|
dat = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(dat))
|
|
return PTR_ERR(dat);
|
|
|
|
err = bgpio_init(&priv->gc, &pdev->dev,
|
|
DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8),
|
|
dat, NULL, NULL, NULL, NULL, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
priv->gc.direction_input = mmio_74xx_dir_in;
|
|
priv->gc.direction_output = mmio_74xx_dir_out;
|
|
priv->gc.get_direction = mmio_74xx_get_direction;
|
|
priv->gc.ngpio = MMIO_74XX_BIT_CNT(priv->flags);
|
|
priv->gc.owner = THIS_MODULE;
|
|
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
return devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
|
|
}
|
|
|
|
static struct platform_driver mmio_74xx_gpio_driver = {
|
|
.driver = {
|
|
.name = "74xx-mmio-gpio",
|
|
.of_match_table = mmio_74xx_gpio_ids,
|
|
},
|
|
.probe = mmio_74xx_gpio_probe,
|
|
};
|
|
module_platform_driver(mmio_74xx_gpio_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
|
|
MODULE_DESCRIPTION("74xx MMIO GPIO driver");
|