1/*
2 * SDK7786 FPGA USRGPIR Support.
3 *
4 * Copyright (C) 2010  Paul Mundt
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License.  See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10#include <linux/init.h>
11#include <linux/interrupt.h>
12#include <linux/gpio.h>
13#include <linux/irq.h>
14#include <linux/kernel.h>
15#include <linux/spinlock.h>
16#include <linux/io.h>
17#include <mach/fpga.h>
18
19#define NR_FPGA_GPIOS	8
20
21static const char *usrgpir_gpio_names[NR_FPGA_GPIOS] = {
22	"in0", "in1", "in2", "in3", "in4", "in5", "in6", "in7",
23};
24
25static int usrgpir_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
26{
27	/* always in */
28	return 0;
29}
30
31static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio)
32{
33	return !!(fpga_read_reg(USRGPIR) & (1 << gpio));
34}
35
36static struct gpio_chip usrgpir_gpio_chip = {
37	.label			= "sdk7786-fpga",
38	.names			= usrgpir_gpio_names,
39	.direction_input	= usrgpir_gpio_direction_input,
40	.get			= usrgpir_gpio_get,
41	.base			= -1, /* don't care */
42	.ngpio			= NR_FPGA_GPIOS,
43};
44
45static int __init usrgpir_gpio_setup(void)
46{
47	return gpiochip_add(&usrgpir_gpio_chip);
48}
49device_initcall(usrgpir_gpio_setup);
50