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Linux/arch/arm/plat-samsung/include/plat/gpio-core.h

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  1 /* linux/arch/arm/plat-s3c/include/plat/gpio-core.h
  2  *
  3  * Copyright 2008 Simtec Electronics
  4  *      http://armlinux.simtec.co.uk/
  5  *      Ben Dooks <ben@simtec.co.uk>
  6  *
  7  * S3C Platform - GPIO core
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12 */
 13 
 14 #ifndef __PLAT_SAMSUNG_GPIO_CORE_H
 15 #define __PLAT_SAMSUNG_GPIO_CORE_H
 16 
 17 #define GPIOCON_OFF     (0x00)
 18 #define GPIODAT_OFF     (0x04)
 19 
 20 #define con_4bit_shift(__off) ((__off) * 4)
 21 
 22 /* Define the core gpiolib support functions that the s3c platforms may
 23  * need to extend or change depending on the hardware and the s3c chip
 24  * selected at build or found at run time.
 25  *
 26  * These definitions are not intended for driver inclusion, there is
 27  * nothing here that should not live outside the platform and core
 28  * specific code.
 29 */
 30 
 31 struct samsung_gpio_chip;
 32 
 33 /**
 34  * struct samsung_gpio_pm - power management (suspend/resume) information
 35  * @save: Routine to save the state of the GPIO block
 36  * @resume: Routine to resume the GPIO block.
 37  */
 38 struct samsung_gpio_pm {
 39         void (*save)(struct samsung_gpio_chip *chip);
 40         void (*resume)(struct samsung_gpio_chip *chip);
 41 };
 42 
 43 struct samsung_gpio_cfg;
 44 
 45 /**
 46  * struct samsung_gpio_chip - wrapper for specific implementation of gpio
 47  * @chip: The chip structure to be exported via gpiolib.
 48  * @base: The base pointer to the gpio configuration registers.
 49  * @group: The group register number for gpio interrupt support.
 50  * @irq_base: The base irq number.
 51  * @config: special function and pull-resistor control information.
 52  * @lock: Lock for exclusive access to this gpio bank.
 53  * @pm_save: Save information for suspend/resume support.
 54  * @bitmap_gpio_int: Bitmap for representing GPIO interrupt or not.
 55  *
 56  * This wrapper provides the necessary information for the Samsung
 57  * specific gpios being registered with gpiolib.
 58  *
 59  * The lock protects each gpio bank from multiple access of the shared
 60  * configuration registers, or from reading of data whilst another thread
 61  * is writing to the register set.
 62  *
 63  * Each chip has its own lock to avoid any  contention between different
 64  * CPU cores trying to get one lock for different GPIO banks, where each
 65  * bank of GPIO has its own register space and configuration registers.
 66  */
 67 struct samsung_gpio_chip {
 68         struct gpio_chip        chip;
 69         struct samsung_gpio_cfg *config;
 70         struct samsung_gpio_pm  *pm;
 71         void __iomem            *base;
 72         int                     irq_base;
 73         int                     group;
 74         spinlock_t               lock;
 75 #ifdef CONFIG_PM
 76         u32                     pm_save[4];
 77 #endif
 78         u32                     bitmap_gpio_int;
 79 };
 80 
 81 static inline struct samsung_gpio_chip *to_samsung_gpio(struct gpio_chip *gpc)
 82 {
 83         return container_of(gpc, struct samsung_gpio_chip, chip);
 84 }
 85 
 86 /**
 87  * samsung_gpiolib_to_irq - convert gpio pin to irq number
 88  * @chip: The gpio chip that the pin belongs to.
 89  * @offset: The offset of the pin in the chip.
 90  *
 91  * This helper returns the irq number calculated from the chip->irq_base and
 92  * the provided offset.
 93  */
 94 extern int samsung_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset);
 95 
 96 /* exported for core SoC support to change */
 97 extern struct samsung_gpio_cfg s3c24xx_gpiocfg_default;
 98 
 99 #ifdef CONFIG_S3C_GPIO_TRACK
100 extern struct samsung_gpio_chip *s3c_gpios[S3C_GPIO_END];
101 
102 static inline struct samsung_gpio_chip *samsung_gpiolib_getchip(unsigned int chip)
103 {
104         return (chip < S3C_GPIO_END) ? s3c_gpios[chip] : NULL;
105 }
106 #else
107 /* machine specific code should provide samsung_gpiolib_getchip */
108 
109 extern struct samsung_gpio_chip s3c24xx_gpios[];
110 
111 static inline struct samsung_gpio_chip *samsung_gpiolib_getchip(unsigned int pin)
112 {
113         struct samsung_gpio_chip *chip;
114 
115         if (pin > S3C_GPIO_END)
116                 return NULL;
117 
118         chip = &s3c24xx_gpios[pin/32];
119         return ((pin - chip->chip.base) < chip->chip.ngpio) ? chip : NULL;
120 }
121 
122 static inline void s3c_gpiolib_track(struct samsung_gpio_chip *chip) { }
123 #endif
124 
125 #ifdef CONFIG_PM
126 extern struct samsung_gpio_pm samsung_gpio_pm_1bit;
127 extern struct samsung_gpio_pm samsung_gpio_pm_2bit;
128 extern struct samsung_gpio_pm samsung_gpio_pm_4bit;
129 #define __gpio_pm(x) x
130 #else
131 #define samsung_gpio_pm_1bit NULL
132 #define samsung_gpio_pm_2bit NULL
133 #define samsung_gpio_pm_4bit NULL
134 #define __gpio_pm(x) NULL
135 
136 #endif /* CONFIG_PM */
137 
138 /* locking wrappers to deal with multiple access to the same gpio bank */
139 #define samsung_gpio_lock(_oc, _fl) spin_lock_irqsave(&(_oc)->lock, _fl)
140 #define samsung_gpio_unlock(_oc, _fl) spin_unlock_irqrestore(&(_oc)->lock, _fl)
141 
142 #endif /* __PLAT_SAMSUNG_GPIO_CORE_H */
143 

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