Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpio / gpio-moxart.c

diff --git a/kernel/drivers/gpio/gpio-moxart.c b/kernel/drivers/gpio/gpio-moxart.c
new file mode 100644 (file)
index 0000000..c3ab46e
--- /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>");