| /* 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 GPIOCON_OFF (0x00) |
| #define GPIODAT_OFF (0x04) |
| |
| #define con_4bit_shift(__off) ((__off) * 4) |
| |
| /* 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 samsung_gpio_chip; |
| |
| /** |
| * struct samsung_gpio_pm - power management (suspend/resume) information |
| * @save: Routine to save the state of the GPIO block |
| * @resume: Routine to resume the GPIO block. |
| */ |
| struct samsung_gpio_pm { |
| void (*save)(struct samsung_gpio_chip *chip); |
| void (*resume)(struct samsung_gpio_chip *chip); |
| }; |
| |
| struct samsung_gpio_cfg; |
| |
| /** |
| * struct samsung_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. |
| * @group: The group register number for gpio interrupt support. |
| * @irq_base: The base irq number. |
| * @config: special function and pull-resistor control information. |
| * @lock: Lock for exclusive access to this gpio bank. |
| * @pm_save: Save information for suspend/resume support. |
| * |
| * This wrapper provides the necessary information for the Samsung |
| * specific gpios being registered with gpiolib. |
| * |
| * The lock protects each gpio bank from multiple access of the shared |
| * configuration registers, or from reading of data whilst another thread |
| * is writing to the register set. |
| * |
| * Each chip has its own lock to avoid any contention between different |
| * CPU cores trying to get one lock for different GPIO banks, where each |
| * bank of GPIO has its own register space and configuration registers. |
| */ |
| struct samsung_gpio_chip { |
| struct gpio_chip chip; |
| struct samsung_gpio_cfg *config; |
| struct samsung_gpio_pm *pm; |
| void __iomem *base; |
| int irq_base; |
| int group; |
| spinlock_t lock; |
| #ifdef CONFIG_PM |
| u32 pm_save[4]; |
| #endif |
| }; |
| |
| static inline struct samsung_gpio_chip *to_samsung_gpio(struct gpio_chip *gpc) |
| { |
| return container_of(gpc, struct samsung_gpio_chip, chip); |
| } |
| |
| /** |
| * samsung_gpiolib_to_irq - convert gpio pin to irq number |
| * @chip: The gpio chip that the pin belongs to. |
| * @offset: The offset of the pin in the chip. |
| * |
| * This helper returns the irq number calculated from the chip->irq_base and |
| * the provided offset. |
| */ |
| extern int samsung_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset); |
| |
| /* exported for core SoC support to change */ |
| extern struct samsung_gpio_cfg s3c24xx_gpiocfg_default; |
| |
| #ifdef CONFIG_S3C_GPIO_TRACK |
| extern struct samsung_gpio_chip *s3c_gpios[S3C_GPIO_END]; |
| |
| static inline struct samsung_gpio_chip *samsung_gpiolib_getchip(unsigned int chip) |
| { |
| return (chip < S3C_GPIO_END) ? s3c_gpios[chip] : NULL; |
| } |
| #else |
| /* machine specific code should provide samsung_gpiolib_getchip */ |
| |
| #include <mach/gpio-track.h> |
| |
| static inline void s3c_gpiolib_track(struct samsung_gpio_chip *chip) { } |
| #endif |
| |
| #ifdef CONFIG_PM |
| extern struct samsung_gpio_pm samsung_gpio_pm_1bit; |
| extern struct samsung_gpio_pm samsung_gpio_pm_2bit; |
| extern struct samsung_gpio_pm samsung_gpio_pm_4bit; |
| #define __gpio_pm(x) x |
| #else |
| #define samsung_gpio_pm_1bit NULL |
| #define samsung_gpio_pm_2bit NULL |
| #define samsung_gpio_pm_4bit NULL |
| #define __gpio_pm(x) NULL |
| |
| #endif /* CONFIG_PM */ |
| |
| /* locking wrappers to deal with multiple access to the same gpio bank */ |
| #define samsung_gpio_lock(_oc, _fl) spin_lock_irqsave(&(_oc)->lock, _fl) |
| #define samsung_gpio_unlock(_oc, _fl) spin_unlock_irqrestore(&(_oc)->lock, _fl) |