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 | |
18 | static const char *usrgpir_gpio_names[NR_FPGA_GPIOS] = { |
19 | "in0" , "in1" , "in2" , "in3" , "in4" , "in5" , "in6" , "in7" , |
20 | }; |
21 | |
22 | static int usrgpir_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) |
23 | { |
24 | /* always in */ |
25 | return 0; |
26 | } |
27 | |
28 | static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio) |
29 | { |
30 | return !!(fpga_read_reg(USRGPIR) & (1 << gpio)); |
31 | } |
32 | |
33 | static 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 | |
42 | static int __init usrgpir_gpio_setup(void) |
43 | { |
44 | return gpiochip_add_data(&usrgpir_gpio_chip, NULL); |
45 | } |
46 | device_initcall(usrgpir_gpio_setup); |
47 | |