1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-ge.c b/drivers/gpio/gpio-ge.c
new file mode 100644
index 000000000..f6a3de99f
--- /dev/null
+++ b/drivers/gpio/gpio-ge.c
@@ -0,0 +1,108 @@
+/*
+ * Driver for GE FPGA based GPIO
+ *
+ * Author: Martyn Welch <martyn.welch@ge.com>
+ *
+ * 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.
+ *
+ * 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.
+ */
+
+/* TODO
+ *
+ * Configuration of output modes (totem-pole/open-drain)
+ * Interrupt configuration - interrupts are always generated the FPGA relies on
+ * the I/O interrupt controllers mask to stop them propergating
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/module.h>
+#include <linux/gpio/driver.h>
+
+#define GEF_GPIO_DIRECT		0x00
+#define GEF_GPIO_IN		0x04
+#define GEF_GPIO_OUT		0x08
+#define GEF_GPIO_TRIG		0x0C
+#define GEF_GPIO_POLAR_A	0x10
+#define GEF_GPIO_POLAR_B	0x14
+#define GEF_GPIO_INT_STAT	0x18
+#define GEF_GPIO_OVERRUN	0x1C
+#define GEF_GPIO_MODE		0x20
+
+static const struct of_device_id gef_gpio_ids[] = {
+	{
+		.compatible	= "gef,sbc610-gpio",
+		.data		= (void *)19,
+	}, {
+		.compatible	= "gef,sbc310-gpio",
+		.data		= (void *)6,
+	}, {
+		.compatible	= "ge,imp3a-gpio",
+		.data		= (void *)16,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, gef_gpio_ids);
+
+static int __init gef_gpio_probe(struct platform_device *pdev)
+{
+	struct gpio_chip *gc;
+	void __iomem *regs;
+	int ret;
+
+	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
+	if (!gc)
+		return -ENOMEM;
+
+	regs = of_iomap(pdev->dev.of_node, 0);
+	if (!regs)
+		return -ENOMEM;
+
+	ret = bgpio_init(gc, &pdev->dev, 4, regs + GEF_GPIO_IN,
+			 regs + GEF_GPIO_OUT, NULL, NULL,
+			 regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER);
+	if (ret) {
+		dev_err(&pdev->dev, "bgpio_init failed\n");
+		goto err0;
+	}
+
+	/* Setup pointers to chip functions */
+	gc->label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOF", pdev->dev.of_node);
+	if (!gc->label) {
+		ret = -ENOMEM;
+		goto err0;
+	}
+
+	gc->base = -1;
+	gc->ngpio = (u16)(uintptr_t)of_device_get_match_data(&pdev->dev);
+	gc->of_gpio_n_cells = 2;
+
+	/* This function adds a memory mapped GPIO chip */
+	ret = devm_gpiochip_add_data(&pdev->dev, gc, NULL);
+	if (ret)
+		goto err0;
+
+	return 0;
+err0:
+	iounmap(regs);
+	pr_err("%pOF: GPIO chip registration failed\n", pdev->dev.of_node);
+	return ret;
+};
+
+static struct platform_driver gef_gpio_driver = {
+	.driver = {
+		.name		= "gef-gpio",
+		.of_match_table	= gef_gpio_ids,
+	},
+};
+module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
+
+MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
+MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
+MODULE_LICENSE("GPL");