// SPDX-License-Identifier: GPL-2.0
/*
 * SDK7786 FPGA USRGPIR Support.
 *
 * Copyright (C) 2010  Paul Mundt
 */
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/gpio/driver.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <mach/fpga.h>

#define NR_FPGA_GPIOS   8

static const char *usrgpir_gpio_names[NR_FPGA_GPIOS] = {
        "in0", "in1", "in2", "in3", "in4", "in5", "in6", "in7",
};

static int usrgpir_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
        /* always in */
        return 0;
}

static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio)
{
        return !!(fpga_read_reg(USRGPIR) & (1 << gpio));
}

static struct gpio_chip usrgpir_gpio_chip = {
        .label                  = "sdk7786-fpga",
        .names                  = usrgpir_gpio_names,
        .direction_input        = usrgpir_gpio_direction_input,
        .get                    = usrgpir_gpio_get,
        .base                   = -1, /* don't care */
        .ngpio                  = NR_FPGA_GPIOS,
};

static int __init usrgpir_gpio_setup(void)
{
        return gpiochip_add_data(&usrgpir_gpio_chip, NULL);
}
device_initcall(usrgpir_gpio_setup);