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* Basic memory-mapped GPIO controllers.
* Copyright 2008 MontaVista Software, Inc.
* Copyright 2008,2010 Anton Vorontsov <>
* 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.
#include <linux/gpio.h>
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/spinlock_types.h>
struct bgpio_pdata {
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_UNREADABLE_REG_SET BIT(1) /* reg_set is unreadable */
#define BGPIOF_UNREADABLE_REG_DIR BIT(2) /* reg_dir is unreadable */
#endif /* __BASIC_MMIO_GPIO_H */