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path: root/kernel/drivers/gpio/gpio-moxart.c
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Diffstat (limited to 'kernel/drivers/gpio/gpio-moxart.c')
-rw-r--r--kernel/drivers/gpio/gpio-moxart.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/kernel/drivers/gpio/gpio-moxart.c b/kernel/drivers/gpio/gpio-moxart.c
new file mode 100644
index 000000000..c3ab46e59
--- /dev/null
+++ b/kernel/drivers/gpio/gpio-moxart.c
@@ -0,0 +1,114 @@
+/*
+ * MOXA ART SoCs GPIO driver.
+ *
+ * Copyright (C) 2013 Jonas Jensen
+ *
+ * Jonas Jensen <jonas.jensen@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_gpio.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/bitops.h>
+#include <linux/basic_mmio_gpio.h>
+
+#define GPIO_DATA_OUT 0x00
+#define GPIO_DATA_IN 0x04
+#define GPIO_PIN_DIRECTION 0x08
+
+static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ return pinctrl_request_gpio(offset);
+}
+
+static void moxart_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+ pinctrl_free_gpio(offset);
+}
+
+static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct bgpio_chip *bgc = to_bgpio_chip(chip);
+ u32 ret = bgc->read_reg(bgc->reg_dir);
+
+ if (ret & BIT(offset))
+ return !!(bgc->read_reg(bgc->reg_set) & BIT(offset));
+ else
+ return !!(bgc->read_reg(bgc->reg_dat) & BIT(offset));
+}
+
+static int moxart_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct bgpio_chip *bgc;
+ void __iomem *base;
+ int ret;
+
+ bgc = devm_kzalloc(dev, sizeof(*bgc), GFP_KERNEL);
+ if (!bgc)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ ret = bgpio_init(bgc, dev, 4, base + GPIO_DATA_IN,
+ base + GPIO_DATA_OUT, NULL,
+ base + GPIO_PIN_DIRECTION, NULL, 0);
+ if (ret) {
+ dev_err(&pdev->dev, "bgpio_init failed\n");
+ return ret;
+ }
+
+ bgc->gc.label = "moxart-gpio";
+ bgc->gc.request = moxart_gpio_request;
+ bgc->gc.free = moxart_gpio_free;
+ bgc->gc.get = moxart_gpio_get;
+ bgc->data = bgc->read_reg(bgc->reg_set);
+ bgc->gc.base = 0;
+ bgc->gc.ngpio = 32;
+ bgc->gc.dev = dev;
+ bgc->gc.owner = THIS_MODULE;
+
+ ret = gpiochip_add(&bgc->gc);
+ if (ret) {
+ dev_err(dev, "%s: gpiochip_add failed\n",
+ dev->of_node->full_name);
+ return ret;
+ }
+
+ return ret;
+}
+
+static const struct of_device_id moxart_gpio_match[] = {
+ { .compatible = "moxa,moxart-gpio" },
+ { }
+};
+
+static struct platform_driver moxart_gpio_driver = {
+ .driver = {
+ .name = "moxart-gpio",
+ .of_match_table = moxart_gpio_match,
+ },
+ .probe = moxart_gpio_probe,
+};
+module_platform_driver(moxart_gpio_driver);
+
+MODULE_DESCRIPTION("MOXART GPIO chip driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");