1 files changed, 78 insertions, 0 deletions
diff --git a/include/linux/basic_mmio_gpio.h b/include/linux/basic_mmio_gpio.h
new file mode 100644
index 000000000..0e97856b2
--- /dev/null
+++ b/include/linux/basic_mmio_gpio.h
@@ -0,0 +1,78 @@
+/*
+ * Basic memory-mapped GPIO controllers.
+ *
+ * Copyright 2008 MontaVista Software, Inc.
+ * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#ifndef __BASIC_MMIO_GPIO_H
+#define __BASIC_MMIO_GPIO_H
+
+#include <linux/gpio.h>
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <linux/spinlock_types.h>
+
+struct bgpio_pdata {
+	const char *label;
+	int base;
+	int ngpio;
+};
+
+struct device;
+
+struct bgpio_chip {
+	struct gpio_chip gc;
+
+	unsigned long (*read_reg)(void __iomem *reg);
+	void (*write_reg)(void __iomem *reg, unsigned long data);
+
+	void __iomem *reg_dat;
+	void __iomem *reg_set;
+	void __iomem *reg_clr;
+	void __iomem *reg_dir;
+
+	/* Number of bits (GPIOs): <register width> * 8. */
+	int bits;
+
+	/*
+	 * Some GPIO controllers work with the big-endian bits notation,
+	 * e.g. in a 8-bits register, GPIO7 is the least significant bit.
+	 */
+	unsigned long (*pin2mask)(struct bgpio_chip *bgc, unsigned int pin);
+
+	/*
+	 * Used to lock bgpio_chip->data. Also, this is needed to keep
+	 * shadowed and real data registers writes together.
+	 */
+	spinlock_t lock;
+
+	/* Shadowed data register to clear/set bits safely. */
+	unsigned long data;
+
+	/* Shadowed direction registers to clear/set direction safely. */
+	unsigned long dir;
+};
+
+static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc)
+{
+	return container_of(gc, struct bgpio_chip, gc);
+}
+
+int bgpio_remove(struct bgpio_chip *bgc);
+int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
+	       unsigned long sz, void __iomem *dat, void __iomem *set,
+	       void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
+	       unsigned long flags);
+
+#define BGPIOF_BIG_ENDIAN		BIT(0)
+#define BGPIOF_UNREADABLE_REG_SET	BIT(1) /* reg_set is unreadable */
+#define BGPIOF_UNREADABLE_REG_DIR	BIT(2) /* reg_dir is unreadable */
+#define BGPIOF_BIG_ENDIAN_BYTE_ORDER	BIT(3)
+
+#endif /* __BASIC_MMIO_GPIO_H */