| /* 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 |
