cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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gpio.c (1081B)

      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);