diff options
Diffstat (limited to 'arch/arm/plat-s3c/include/plat/gpio-core.h')
| -rw-r--r-- | arch/arm/plat-s3c/include/plat/gpio-core.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c/include/plat/gpio-core.h b/arch/arm/plat-s3c/include/plat/gpio-core.h new file mode 100644 index 000000000000..2fc60a580ac8 --- /dev/null +++ b/arch/arm/plat-s3c/include/plat/gpio-core.h @@ -0,0 +1,77 @@ +/* linux/arch/arm/plat-s3c/include/plat/gpio-core.h + * + * Copyright 2008 Simtec Electronics + * http://armlinux.simtec.co.uk/ + * Ben Dooks <ben@simtec.co.uk> + * + * S3C Platform - GPIO core + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +/* Define the core gpiolib support functions that the s3c platforms may + * need to extend or change depending on the hardware and the s3c chip + * selected at build or found at run time. + * + * These definitions are not intended for driver inclusion, there is + * nothing here that should not live outside the platform and core + * specific code. +*/ + +struct s3c_gpio_cfg; + +/** + * struct s3c_gpio_chip - wrapper for specific implementation of gpio + * @chip: The chip structure to be exported via gpiolib. + * @base: The base pointer to the gpio configuration registers. + * @config: special function and pull-resistor control information. + * + * This wrapper provides the necessary information for the Samsung + * specific gpios being registered with gpiolib. + */ +struct s3c_gpio_chip { + struct gpio_chip chip; + struct s3c_gpio_cfg *config; + void __iomem *base; +}; + +static inline struct s3c_gpio_chip *to_s3c_gpio(struct gpio_chip *gpc) +{ + return container_of(gpc, struct s3c_gpio_chip, chip); +} + +/** s3c_gpiolib_add() - add the s3c specific version of a gpio_chip. + * @chip: The chip to register + * + * This is a wrapper to gpiochip_add() that takes our specific gpio chip + * information and makes the necessary alterations for the platform and + * notes the information for use with the configuration systems and any + * other parts of the system. + */ +extern void s3c_gpiolib_add(struct s3c_gpio_chip *chip); + +/* CONFIG_S3C_GPIO_TRACK enables the tracking of the s3c specific gpios + * for use with the configuration calls, and other parts of the s3c gpiolib + * support code. + * + * Not all s3c support code will need this, as some configurations of cpu + * may only support one or two different configuration options and have an + * easy gpio to s3c_gpio_chip mapping function. If this is the case, then + * the machine support file should provide its own s3c_gpiolib_getchip() + * and any other necessary functions. + */ + +#ifdef CONFIG_S3C_GPIO_TRACK +extern struct s3c_gpio_chip *s3c_gpios[S3C_GPIO_END]; + +static inline struct s3c_gpio_chip *s3c_gpiolib_getchip(unsigned int chip) +{ + return (chip < S3C_GPIO_END) ? s3c_gpios[chip] : NULL; +} +#else +/* machine specific code should provide s3c_gpiolib_getchip */ + +static inline void s3c_gpiolib_track(struct s3c_gpio_chip *chip) { } +#endif |