Commit | Line | Data |
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aeec56e3 AV |
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 | ||
280df6b3 JI |
16 | #include <linux/gpio.h> |
17 | #include <linux/types.h> | |
18 | #include <linux/compiler.h> | |
e5ea3f12 | 19 | #include <linux/spinlock_types.h> |
280df6b3 | 20 | |
aeec56e3 | 21 | struct bgpio_pdata { |
781f6d71 | 22 | const char *label; |
aeec56e3 | 23 | int base; |
924e7a9f | 24 | int ngpio; |
aeec56e3 AV |
25 | }; |
26 | ||
280df6b3 JI |
27 | struct device; |
28 | ||
29 | struct 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 | ||
62 | static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc) | |
63 | { | |
64 | return container_of(gc, struct bgpio_chip, gc); | |
65 | } | |
66 | ||
4f5b0480 RK |
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, | |
3e11f7b8 SG |
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 */ | |
2b78f1e1 | 76 | #define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3) |
b19e7f51 | 77 | #define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */ |
91492a44 | 78 | #define BGPIOF_NO_OUTPUT BIT(5) /* only input */ |
280df6b3 | 79 | |
aeec56e3 | 80 | #endif /* __BASIC_MMIO_GPIO_H */ |