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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/linux/basic_mmio_gpio.h
2 * Basic memory-mapped GPIO controllers.
4 * Copyright 2008 MontaVista Software, Inc.
5 * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com>
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.
13 #ifndef __BASIC_MMIO_GPIO_H
14 #define __BASIC_MMIO_GPIO_H
16 #include <linux/gpio.h>
17 #include <linux/types.h>
18 #include <linux/compiler.h>
19 #include <linux/spinlock_types.h>
32 unsigned long (*read_reg
)(void __iomem
*reg
);
33 void (*write_reg
)(void __iomem
*reg
, unsigned long data
);
35 void __iomem
*reg_dat
;
36 void __iomem
*reg_set
;
37 void __iomem
*reg_clr
;
38 void __iomem
*reg_dir
;
40 /* Number of bits (GPIOs): <register width> * 8. */
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.
47 unsigned long (*pin2mask
)(struct bgpio_chip
*bgc
, unsigned int pin
);
50 * Used to lock bgpio_chip->data. Also, this is needed to keep
51 * shadowed and real data registers writes together.
55 /* Shadowed data register to clear/set bits safely. */
58 /* Shadowed direction registers to clear/set direction safely. */
62 static inline struct bgpio_chip
*to_bgpio_chip(struct gpio_chip
*gc
)
64 return container_of(gc
, struct bgpio_chip
, gc
);
67 int bgpio_remove(struct bgpio_chip
*bgc
);
68 int 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
,
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 */
80 #endif /* __BASIC_MMIO_GPIO_H */