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80 lines
2.2 KiB
80 lines
2.2 KiB
/* |
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* Basic memory-mapped GPIO controllers. |
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* |
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* Copyright 2008 MontaVista Software, Inc. |
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* Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 2 of the License, or (at your |
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* option) any later version. |
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*/ |
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#ifndef __BASIC_MMIO_GPIO_H |
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#define __BASIC_MMIO_GPIO_H |
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#include <linux/gpio.h> |
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#include <linux/types.h> |
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#include <linux/compiler.h> |
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#include <linux/spinlock_types.h> |
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struct bgpio_pdata { |
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const char *label; |
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int base; |
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int ngpio; |
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}; |
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struct device; |
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struct bgpio_chip { |
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struct gpio_chip gc; |
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unsigned long (*read_reg)(void __iomem *reg); |
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void (*write_reg)(void __iomem *reg, unsigned long data); |
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void __iomem *reg_dat; |
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void __iomem *reg_set; |
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void __iomem *reg_clr; |
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void __iomem *reg_dir; |
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/* Number of bits (GPIOs): <register width> * 8. */ |
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int bits; |
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/* |
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* Some GPIO controllers work with the big-endian bits notation, |
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* e.g. in a 8-bits register, GPIO7 is the least significant bit. |
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*/ |
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unsigned long (*pin2mask)(struct bgpio_chip *bgc, unsigned int pin); |
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/* |
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* Used to lock bgpio_chip->data. Also, this is needed to keep |
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* shadowed and real data registers writes together. |
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*/ |
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spinlock_t lock; |
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/* Shadowed data register to clear/set bits safely. */ |
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unsigned long data; |
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/* Shadowed direction registers to clear/set direction safely. */ |
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unsigned long dir; |
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}; |
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static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc) |
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{ |
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return container_of(gc, struct bgpio_chip, gc); |
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} |
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int bgpio_remove(struct bgpio_chip *bgc); |
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int bgpio_init(struct bgpio_chip *bgc, struct device *dev, |
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unsigned long sz, void __iomem *dat, void __iomem *set, |
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void __iomem *clr, void __iomem *dirout, void __iomem *dirin, |
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unsigned long flags); |
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#define BGPIOF_BIG_ENDIAN BIT(0) |
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#define BGPIOF_UNREADABLE_REG_SET BIT(1) /* reg_set is unreadable */ |
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#define BGPIOF_UNREADABLE_REG_DIR BIT(2) /* reg_dir is unreadable */ |
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#define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3) |
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#define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */ |
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#define BGPIOF_NO_OUTPUT BIT(5) /* only input */ |
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#endif /* __BASIC_MMIO_GPIO_H */
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