diff options
Diffstat (limited to 'include/linux/basic_mmio_gpio.h')
| -rw-r--r-- | include/linux/basic_mmio_gpio.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/include/linux/basic_mmio_gpio.h b/include/linux/basic_mmio_gpio.h index 198087a16fc4..1ae12710d732 100644 --- a/include/linux/basic_mmio_gpio.h +++ b/include/linux/basic_mmio_gpio.h @@ -13,8 +13,64 @@ #ifndef __BASIC_MMIO_GPIO_H #define __BASIC_MMIO_GPIO_H +#include <linux/gpio.h> +#include <linux/types.h> +#include <linux/compiler.h> + struct bgpio_pdata { int base; + int ngpio; }; +struct device; + +struct bgpio_chip { + struct gpio_chip gc; + + unsigned long (*read_reg)(void __iomem *reg); + void (*write_reg)(void __iomem *reg, unsigned long data); + + void __iomem *reg_dat; + void __iomem *reg_set; + void __iomem *reg_clr; + void __iomem *reg_dir; + + /* Number of bits (GPIOs): <register width> * 8. */ + int bits; + + /* + * Some GPIO controllers work with the big-endian bits notation, + * e.g. in a 8-bits register, GPIO7 is the least significant bit. + */ + unsigned long (*pin2mask)(struct bgpio_chip *bgc, unsigned int pin); + + /* + * Used to lock bgpio_chip->data. Also, this is needed to keep + * shadowed and real data registers writes together. + */ + spinlock_t lock; + + /* Shadowed data register to clear/set bits safely. */ + unsigned long data; + + /* Shadowed direction registers to clear/set direction safely. */ + unsigned long dir; +}; + +static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc) +{ + return container_of(gc, struct bgpio_chip, gc); +} + +int __devexit bgpio_remove(struct bgpio_chip *bgc); +int __devinit bgpio_init(struct bgpio_chip *bgc, + struct device *dev, + unsigned long sz, + void __iomem *dat, + void __iomem *set, + void __iomem *clr, + void __iomem *dirout, + void __iomem *dirin, + bool big_endian); + #endif /* __BASIC_MMIO_GPIO_H */ |