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/* SPDX-License-Identifier: GPL-2.0 */
* Copyright 2008 Simtec Electronics
* Ben Dooks <>
* S3C Platform - GPIO core
/* Bring in machine-local definitions, especially S3C_GPIO_END */
#include "gpio-samsung.h"
#include <linux/gpio/driver.h>
#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.
* @bitmap_gpio_int: Bitmap for representing GPIO interrupt or not.
* 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];
u32 bitmap_gpio_int;
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;
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;
/* machine specific code should provide samsung_gpiolib_getchip */
extern struct samsung_gpio_chip s3c24xx_gpios[];
static inline struct samsung_gpio_chip *samsung_gpiolib_getchip(unsigned int pin)
struct samsung_gpio_chip *chip;
if (pin > S3C_GPIO_END)
return NULL;
chip = &s3c24xx_gpios[pin/32];
return ((pin - chip->chip.base) < chip->chip.ngpio) ? chip : NULL;
static inline void s3c_gpiolib_track(struct samsung_gpio_chip *chip) { }
#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
#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)