LXR linux/arch/sh/boards/mach-sdk7786/gpio.c

   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