155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
/*
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* MOXA ART SoCs GPIO driver.
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*
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* Copyright (C) 2013 Jonas Jensen
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*
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* Jonas Jensen <jonas.jensen@gmail.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_gpio.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/delay.h>
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#include <linux/timer.h>
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#include <linux/bitops.h>
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#define GPIO_DATA_OUT 0x00
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#define GPIO_DATA_IN 0x04
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#define GPIO_PIN_DIRECTION 0x08
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struct moxart_gpio_chip {
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struct gpio_chip gpio;
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void __iomem *base;
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};
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static inline struct moxart_gpio_chip *to_moxart_gpio(struct gpio_chip *chip)
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{
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return container_of(chip, struct moxart_gpio_chip, gpio);
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}
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static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset)
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{
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return pinctrl_request_gpio(offset);
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}
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static void moxart_gpio_free(struct gpio_chip *chip, unsigned offset)
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{
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pinctrl_free_gpio(offset);
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}
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static void moxart_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
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void __iomem *ioaddr = gc->base + GPIO_DATA_OUT;
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u32 reg = readl(ioaddr);
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if (value)
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reg = reg | BIT(offset);
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else
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reg = reg & ~BIT(offset);
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writel(reg, ioaddr);
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}
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static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
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u32 ret = readl(gc->base + GPIO_PIN_DIRECTION);
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if (ret & BIT(offset))
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return !!(readl(gc->base + GPIO_DATA_OUT) & BIT(offset));
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else
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return !!(readl(gc->base + GPIO_DATA_IN) & BIT(offset));
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}
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static int moxart_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
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void __iomem *ioaddr = gc->base + GPIO_PIN_DIRECTION;
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writel(readl(ioaddr) & ~BIT(offset), ioaddr);
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return 0;
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}
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static int moxart_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
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void __iomem *ioaddr = gc->base + GPIO_PIN_DIRECTION;
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moxart_gpio_set(chip, offset, value);
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writel(readl(ioaddr) | BIT(offset), ioaddr);
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return 0;
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}
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static struct gpio_chip moxart_template_chip = {
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.label = "moxart-gpio",
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.request = moxart_gpio_request,
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.free = moxart_gpio_free,
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.direction_input = moxart_gpio_direction_input,
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.direction_output = moxart_gpio_direction_output,
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.set = moxart_gpio_set,
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.get = moxart_gpio_get,
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.ngpio = 32,
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.owner = THIS_MODULE,
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};
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static int moxart_gpio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct moxart_gpio_chip *mgc;
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int ret;
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mgc = devm_kzalloc(dev, sizeof(*mgc), GFP_KERNEL);
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if (!mgc)
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return -ENOMEM;
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mgc->gpio = moxart_template_chip;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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mgc->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(mgc->base))
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return PTR_ERR(mgc->base);
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mgc->gpio.dev = dev;
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ret = gpiochip_add(&mgc->gpio);
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if (ret) {
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dev_err(dev, "%s: gpiochip_add failed\n",
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dev->of_node->full_name);
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return ret;
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}
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return 0;
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}
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static const struct of_device_id moxart_gpio_match[] = {
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{ .compatible = "moxa,moxart-gpio" },
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{ }
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};
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static struct platform_driver moxart_gpio_driver = {
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.driver = {
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.name = "moxart-gpio",
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.owner = THIS_MODULE,
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.of_match_table = moxart_gpio_match,
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},
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.probe = moxart_gpio_probe,
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};
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module_platform_driver(moxart_gpio_driver);
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MODULE_DESCRIPTION("MOXART GPIO chip driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
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