1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * SDK7786 FPGA USRGPIR Support.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2010 Paul Mundt
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun #include <linux/init.h>
8*4882a593Smuzhiyun #include <linux/interrupt.h>
9*4882a593Smuzhiyun #include <linux/gpio/driver.h>
10*4882a593Smuzhiyun #include <linux/irq.h>
11*4882a593Smuzhiyun #include <linux/kernel.h>
12*4882a593Smuzhiyun #include <linux/spinlock.h>
13*4882a593Smuzhiyun #include <linux/io.h>
14*4882a593Smuzhiyun #include <mach/fpga.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define NR_FPGA_GPIOS 8
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun static const char *usrgpir_gpio_names[NR_FPGA_GPIOS] = {
19*4882a593Smuzhiyun "in0", "in1", "in2", "in3", "in4", "in5", "in6", "in7",
20*4882a593Smuzhiyun };
21*4882a593Smuzhiyun
usrgpir_gpio_direction_input(struct gpio_chip * chip,unsigned gpio)22*4882a593Smuzhiyun static int usrgpir_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun /* always in */
25*4882a593Smuzhiyun return 0;
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun
usrgpir_gpio_get(struct gpio_chip * chip,unsigned gpio)28*4882a593Smuzhiyun static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun return !!(fpga_read_reg(USRGPIR) & (1 << gpio));
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun static struct gpio_chip usrgpir_gpio_chip = {
34*4882a593Smuzhiyun .label = "sdk7786-fpga",
35*4882a593Smuzhiyun .names = usrgpir_gpio_names,
36*4882a593Smuzhiyun .direction_input = usrgpir_gpio_direction_input,
37*4882a593Smuzhiyun .get = usrgpir_gpio_get,
38*4882a593Smuzhiyun .base = -1, /* don't care */
39*4882a593Smuzhiyun .ngpio = NR_FPGA_GPIOS,
40*4882a593Smuzhiyun };
41*4882a593Smuzhiyun
usrgpir_gpio_setup(void)42*4882a593Smuzhiyun static int __init usrgpir_gpio_setup(void)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun return gpiochip_add_data(&usrgpir_gpio_chip, NULL);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun device_initcall(usrgpir_gpio_setup);
47