projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| aeec56e3 AV |
1 | /* |
| 2 | * Basic memory-mapped GPIO controllers. | |
| 3 | * | |
| 4 | * Copyright 2008 MontaVista Software, Inc. | |
| 5 | * Copyright 2008,2010 Anton Vorontsov <[email protected]> | |
| 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 AV |
21 | struct bgpio_pdata { |
| 22 | int base; | |
| 924e7a9f | 23 | int ngpio; |
| aeec56e3 AV |
24 | }; |
| 25 | ||
| 280df6b3 JI |
26 | struct device; |
| 27 | ||
| 28 | struct bgpio_chip { | |
| 29 | struct gpio_chip gc; | |
| 30 | ||
| 31 | unsigned long (*read_reg)(void __iomem *reg); | |
| 32 | void (*write_reg)(void __iomem *reg, unsigned long data); | |
| 33 | ||
| 34 | void __iomem *reg_dat; | |
| 35 | void __iomem *reg_set; | |
| 36 | void __iomem *reg_clr; | |
| 37 | void __iomem *reg_dir; | |
| 38 | ||
| 39 | /* Number of bits (GPIOs): <register width> * 8. */ | |
| 40 | int bits; | |
| 41 | ||
| 42 | /* | |
| 43 | * Some GPIO controllers work with the big-endian bits notation, | |
| 44 | * e.g. in a 8-bits register, GPIO7 is the least significant bit. | |
| 45 | */ | |
| 46 | unsigned long (*pin2mask)(struct bgpio_chip *bgc, unsigned int pin); | |
| 47 | ||
| 48 | /* | |
| 49 | * Used to lock bgpio_chip->data. Also, this is needed to keep | |
| 50 | * shadowed and real data registers writes together. | |
| 51 | */ | |
| 52 | spinlock_t lock; | |
| 53 | ||
| 54 | /* Shadowed data register to clear/set bits safely. */ | |
| 55 | unsigned long data; | |
| 56 | ||
| 57 | /* Shadowed direction registers to clear/set direction safely. */ | |
| 58 | unsigned long dir; | |
| 59 | }; | |
| 60 | ||
| 61 | static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc) | |
| 62 | { | |
| 63 | return container_of(gc, struct bgpio_chip, gc); | |
| 64 | } | |
| 65 | ||
| 4f5b0480 RK |
66 | int bgpio_remove(struct bgpio_chip *bgc); |
| 67 | int bgpio_init(struct bgpio_chip *bgc, struct device *dev, | |
| 68 | unsigned long sz, void __iomem *dat, void __iomem *set, | |
| 69 | void __iomem *clr, void __iomem *dirout, void __iomem *dirin, | |
| 3e11f7b8 SG |
70 | unsigned long flags); |
| 71 | ||
| 72 | #define BGPIOF_BIG_ENDIAN BIT(0) | |
| 73 | #define BGPIOF_UNREADABLE_REG_SET BIT(1) /* reg_set is unreadable */ | |
| 74 | #define BGPIOF_UNREADABLE_REG_DIR BIT(2) /* reg_dir is unreadable */ | |
| 280df6b3 | 75 | |
| aeec56e3 | 76 | #endif /* __BASIC_MMIO_GPIO_H */ |