Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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
20struct bgpio_pdata {
21 int base;
22 int ngpio;
23};
24
25struct device;
26
27struct bgpio_chip {
28 struct gpio_chip gc;
29
30 unsigned long (*read_reg)(void __iomem *reg);
31 void (*write_reg)(void __iomem *reg, unsigned long data);
32
33 void __iomem *reg_dat;
34 void __iomem *reg_set;
35 void __iomem *reg_clr;
36 void __iomem *reg_dir;
37
38 /* Number of bits (GPIOs): <register width> * 8. */
39 int bits;
40
41 /*
42 * Some GPIO controllers work with the big-endian bits notation,
43 * e.g. in a 8-bits register, GPIO7 is the least significant bit.
44 */
45 unsigned long (*pin2mask)(struct bgpio_chip *bgc, unsigned int pin);
46
47 /*
48 * Used to lock bgpio_chip->data. Also, this is needed to keep
49 * shadowed and real data registers writes together.
50 */
51 spinlock_t lock;
52
53 /* Shadowed data register to clear/set bits safely. */
54 unsigned long data;
55
56 /* Shadowed direction registers to clear/set direction safely. */
57 unsigned long dir;
58};
59
60static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc)
61{
62 return container_of(gc, struct bgpio_chip, gc);
63}
64
65int __devexit bgpio_remove(struct bgpio_chip *bgc);
66int __devinit bgpio_init(struct bgpio_chip *bgc,
67 struct device *dev,
68 unsigned long sz,
69 void __iomem *dat,
70 void __iomem *set,
71 void __iomem *clr,
72 void __iomem *dirout,
73 void __iomem *dirin,
74 bool big_endian);
75
76#endif /* __BASIC_MMIO_GPIO_H */