mirror of https://gitee.com/openkylin/linux.git
131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
/*
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* arch/arm/plat-iop/gpio.c
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* GPIO handling for Intel IOP3xx processors.
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*
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* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*/
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/gpio.h>
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#include <linux/export.h>
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#include <linux/platform_device.h>
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#include <linux/bitops.h>
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#include <linux/io.h>
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#define IOP3XX_N_GPIOS 8
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#define GPIO_IN 0
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#define GPIO_OUT 1
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#define GPIO_LOW 0
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#define GPIO_HIGH 1
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/* Memory base offset */
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static void __iomem *base;
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#define IOP3XX_GPIO_REG(reg) (base + (reg))
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#define IOP3XX_GPOE IOP3XX_GPIO_REG(0x0000)
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#define IOP3XX_GPID IOP3XX_GPIO_REG(0x0004)
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#define IOP3XX_GPOD IOP3XX_GPIO_REG(0x0008)
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static void gpio_line_config(int line, int direction)
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{
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unsigned long flags;
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u32 val;
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local_irq_save(flags);
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val = readl(IOP3XX_GPOE);
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if (direction == GPIO_IN) {
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val |= BIT(line);
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} else if (direction == GPIO_OUT) {
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val &= ~BIT(line);
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}
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writel(val, IOP3XX_GPOE);
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local_irq_restore(flags);
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}
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static int gpio_line_get(int line)
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{
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return !!(readl(IOP3XX_GPID) & BIT(line));
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}
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static void gpio_line_set(int line, int value)
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{
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unsigned long flags;
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u32 val;
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local_irq_save(flags);
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val = readl(IOP3XX_GPOD);
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if (value == GPIO_LOW) {
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val &= ~BIT(line);
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} else if (value == GPIO_HIGH) {
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val |= BIT(line);
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}
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writel(val, IOP3XX_GPOD);
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local_irq_restore(flags);
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}
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static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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{
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gpio_line_config(gpio, GPIO_IN);
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return 0;
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}
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static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
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{
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gpio_line_set(gpio, level);
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gpio_line_config(gpio, GPIO_OUT);
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return 0;
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}
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static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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return gpio_line_get(gpio);
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}
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static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
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{
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gpio_line_set(gpio, value);
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}
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static struct gpio_chip iop3xx_chip = {
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.label = "iop3xx",
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.direction_input = iop3xx_gpio_direction_input,
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.get = iop3xx_gpio_get_value,
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.direction_output = iop3xx_gpio_direction_output,
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.set = iop3xx_gpio_set_value,
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.base = 0,
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.ngpio = IOP3XX_N_GPIOS,
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};
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static int iop3xx_gpio_probe(struct platform_device *pdev)
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{
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struct resource *res;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(&pdev->dev, res);
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return gpiochip_add(&iop3xx_chip);
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}
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static struct platform_driver iop3xx_gpio_driver = {
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.driver = {
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.name = "gpio-iop",
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.owner = THIS_MODULE,
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},
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.probe = iop3xx_gpio_probe,
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};
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static int __init iop3xx_gpio_init(void)
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{
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return platform_driver_register(&iop3xx_gpio_driver);
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}
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arch_initcall(iop3xx_gpio_init);
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