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/*
* Basic memory-mapped GPIO controllers.
*
* Based on linux driver by:
* 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 <common.h>
#include <gpio.h>
#include <io.h>
struct bgpio_pdata {
int base;
int ngpio;
};
struct bgpio_chip {
struct gpio_chip gc;
struct gpio_ops ops;
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_out;
void __iomem *reg_dir_in;
bool dir_unreadable;
bool be_bits;
/* 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 int (*pin2mask)(struct bgpio_chip *bgc, unsigned int pin);
/* Shadowed data register to clear/set bits safely. */
unsigned int data;
/* Shadowed direction registers to clear/set direction safely. */
unsigned int dir;
};
static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc)
{
return container_of(gc, struct bgpio_chip, gc);
}
int bgpio_init(struct bgpio_chip *bgc, struct device_d *dev,
unsigned int sz, void __iomem *dat, void __iomem *set,
void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
unsigned long flags);
void bgpio_remove(struct bgpio_chip *bgc);
#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)
#define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */
#define BGPIOF_NO_OUTPUT BIT(5) /* only input */
#define BGPIOF_NO_SET_ON_INPUT BIT(6)
#endif /* __BASIC_MMIO_GPIO_H */
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