mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 01:41:39 +00:00
![Arnd Bergmann](/assets/img/avatar_default.png)
A lot of header files are only used internally now, so they can be moved to mach-s3c, out of the visibility of drivers. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20200806182059.2431-40-krzk@kernel.org [krzk: Rebase and fixup leds-s3c24xx driver] Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
142 lines
4.3 KiB
C
142 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright 2008 Simtec Electronics
|
|
* http://armlinux.simtec.co.uk/
|
|
* Ben Dooks <ben@simtec.co.uk>
|
|
*
|
|
* S3C Platform - GPIO core
|
|
*/
|
|
|
|
#ifndef __PLAT_SAMSUNG_GPIO_CORE_H
|
|
#define __PLAT_SAMSUNG_GPIO_CORE_H
|
|
|
|
/* 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];
|
|
#endif
|
|
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;
|
|
|
|
#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 */
|
|
|
|
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) { }
|
|
#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)
|
|
|
|
#endif /* __PLAT_SAMSUNG_GPIO_CORE_H */
|