1/* 2 * Basic memory-mapped GPIO controllers. 3 * 4 * Copyright 2008 MontaVista Software, Inc. 5 * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 */ 12 13#ifndef __BASIC_MMIO_GPIO_H 14#define __BASIC_MMIO_GPIO_H 15 16#include <linux/gpio.h> 17#include <linux/types.h> 18#include <linux/compiler.h> 19#include <linux/spinlock_types.h> 20 21struct bgpio_pdata { 22 const char *label; 23 int base; 24 int ngpio; 25}; 26 27struct device; 28 29struct bgpio_chip { 30 struct gpio_chip gc; 31 32 unsigned long (*read_reg)(void __iomem *reg); 33 void (*write_reg)(void __iomem *reg, unsigned long data); 34 35 void __iomem *reg_dat; 36 void __iomem *reg_set; 37 void __iomem *reg_clr; 38 void __iomem *reg_dir; 39 40 /* Number of bits (GPIOs): <register width> * 8. */ 41 int bits; 42 43 /* 44 * Some GPIO controllers work with the big-endian bits notation, 45 * e.g. in a 8-bits register, GPIO7 is the least significant bit. 46 */ 47 unsigned long (*pin2mask)(struct bgpio_chip *bgc, unsigned int pin); 48 49 /* 50 * Used to lock bgpio_chip->data. Also, this is needed to keep 51 * shadowed and real data registers writes together. 52 */ 53 spinlock_t lock; 54 55 /* Shadowed data register to clear/set bits safely. */ 56 unsigned long data; 57 58 /* Shadowed direction registers to clear/set direction safely. */ 59 unsigned long dir; 60}; 61 62static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc) 63{ 64 return container_of(gc, struct bgpio_chip, gc); 65} 66 67int bgpio_remove(struct bgpio_chip *bgc); 68int bgpio_init(struct bgpio_chip *bgc, struct device *dev, 69 unsigned long sz, void __iomem *dat, void __iomem *set, 70 void __iomem *clr, void __iomem *dirout, void __iomem *dirin, 71 unsigned long flags); 72 73#define BGPIOF_BIG_ENDIAN BIT(0) 74#define BGPIOF_UNREADABLE_REG_SET BIT(1) /* reg_set is unreadable */ 75#define BGPIOF_UNREADABLE_REG_DIR BIT(2) /* reg_dir is unreadable */ 76#define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3) 77#define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */ 78#define BGPIOF_NO_OUTPUT BIT(5) /* only input */ 79 80#endif /* __BASIC_MMIO_GPIO_H */ 81