This patch adds generic memory-mapped GPIO controller support. Code taken from Linux Kernel and adopted for barebox. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*
|
|
* 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 int (*read_reg)(void __iomem *reg);
|
|
void (*write_reg)(void __iomem *reg, unsigned int 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 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 */
|
|
|
|
#endif /* __BASIC_MMIO_GPIO_H */
|