1// SPDX-License-Identifier: GPL-2.0
2/*
3 * SDK7786 FPGA USRGPIR Support.
4 *
5 * Copyright (C) 2010  Paul Mundt
6 */
7#include <linux/init.h>
8#include <linux/interrupt.h>
9#include <linux/gpio/driver.h>
10#include <linux/irq.h>
11#include <linux/kernel.h>
12#include <linux/spinlock.h>
13#include <linux/io.h>
14#include <mach/fpga.h>
15
16#define NR_FPGA_GPIOS	8
17
18static const char *usrgpir_gpio_names[NR_FPGA_GPIOS] = {
19	"in0", "in1", "in2", "in3", "in4", "in5", "in6", "in7",
20};
21
22static int usrgpir_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
23{
24	/* always in */
25	return 0;
26}
27
28static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio)
29{
30	return !!(fpga_read_reg(USRGPIR) & (1 << gpio));
31}
32
33static struct gpio_chip usrgpir_gpio_chip = {
34	.label			= "sdk7786-fpga",
35	.names			= usrgpir_gpio_names,
36	.direction_input	= usrgpir_gpio_direction_input,
37	.get			= usrgpir_gpio_get,
38	.base			= -1, /* don't care */
39	.ngpio			= NR_FPGA_GPIOS,
40};
41
42static int __init usrgpir_gpio_setup(void)
43{
44	return gpiochip_add_data(&usrgpir_gpio_chip, NULL);
45}
46device_initcall(usrgpir_gpio_setup);
47