LXR uboot/drivers/gpio/spear

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2012 Stefan Roese <sr@denx.de>
   4 */
   5
   6/*
   7 * Driver for SPEAr600 GPIO controller
   8 */
   9
  10#include <common.h>
  11#include <malloc.h>
  12#include <asm/arch/hardware.h>
  13#include <asm/gpio.h>
  14#include <asm/io.h>
  15#include <errno.h>
  16
  17static int gpio_direction(unsigned gpio,
  18                          enum gpio_direction direction)
  19{
  20        struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
  21        u32 val;
  22
  23        val = readl(&regs->gpiodir);
  24
  25        if (direction == GPIO_DIRECTION_OUT)
  26                val |= 1 << gpio;
  27        else
  28                val &= ~(1 << gpio);
  29
  30        writel(val, &regs->gpiodir);
  31
  32        return 0;
  33}
  34
  35int gpio_set_value(unsigned gpio, int value)
  36{
  37        struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
  38
  39        if (value)
  40                writel(1 << gpio, &regs->gpiodata[DATA_REG_ADDR(gpio)]);
  41        else
  42                writel(0, &regs->gpiodata[DATA_REG_ADDR(gpio)]);
  43
  44        return 0;
  45}
  46
  47int gpio_get_value(unsigned gpio)
  48{
  49        struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
  50        u32 val;
  51
  52        val = readl(&regs->gpiodata[DATA_REG_ADDR(gpio)]);
  53
  54        return !!val;
  55}
  56
  57int gpio_request(unsigned gpio, const char *label)
  58{
  59        if (gpio >= SPEAR_GPIO_COUNT)
  60                return -EINVAL;
  61
  62        return 0;
  63}
  64
  65int gpio_free(unsigned gpio)
  66{
  67        return 0;
  68}
  69
  70void gpio_toggle_value(unsigned gpio)
  71{
  72        gpio_set_value(gpio, !gpio_get_value(gpio));
  73}
  74
  75int gpio_direction_input(unsigned gpio)
  76{
  77        return gpio_direction(gpio, GPIO_DIRECTION_IN);
  78}
  79
  80int gpio_direction_output(unsigned gpio, int value)
  81{
  82        int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT);
  83
  84        if (ret < 0)
  85                return ret;
  86
  87        gpio_set_value(gpio, value);
  88        return 0;
  89}
  90