| Paul Mundt | 47da88f | 2010-10-14 03:04:44 +0900 | [diff] [blame] | 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 | |
| 21 | static const char *usrgpir_gpio_names[NR_FPGA_GPIOS] = { |
| 22 | "in0", "in1", "in2", "in3", "in4", "in5", "in6", "in7", |
| 23 | }; |
| 24 | |
| 25 | static int usrgpir_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) |
| 26 | { |
| 27 | /* always in */ |
| 28 | return 0; |
| 29 | } |
| 30 | |
| 31 | static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio) |
| 32 | { |
| 33 | return !!(fpga_read_reg(USRGPIR) & (1 << gpio)); |
| 34 | } |
| 35 | |
| 36 | static 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 | |
| 45 | static int __init usrgpir_gpio_setup(void) |
| 46 | { |
| 47 | return gpiochip_add(&usrgpir_gpio_chip); |
| 48 | } |
| 49 | device_initcall(usrgpir_gpio_setup); |