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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 /* Bring in machine-local definitions, especially S3C_GPIO_END */
 18 #include <mach/gpio-samsung.h>
 19 
 20 #define GPIOCON_OFF     (0x00)
 21 #define GPIODAT_OFF     (0x04)
 22 
 23 #define con_4bit_shift(__off) ((__off) * 4)
 24 
 25 /* Define the core gpiolib support functions that the s3c platforms may
 26  * need to extend or change depending on the hardware and the s3c chip
 27  * selected at build or found at run time.
 28  *
 29  * These definitions are not intended for driver inclusion, there is
 30  * nothing here that should not live outside the platform and core
 31  * specific code.
 32 */
 33 
 34 struct samsung_gpio_chip;
 35 
 36 /**
 37  * struct samsung_gpio_pm - power management (suspend/resume) information
 38  * @save: Routine to save the state of the GPIO block
 39  * @resume: Routine to resume the GPIO block.
 40  */
 41 struct samsung_gpio_pm {
 42         void (*save)(struct samsung_gpio_chip *chip);
 43         void (*resume)(struct samsung_gpio_chip *chip);
 44 };
 45 
 46 struct samsung_gpio_cfg;
 47 
 48 /**
 49  * struct samsung_gpio_chip - wrapper for specific implementation of gpio
 50  * @chip: The chip structure to be exported via gpiolib.
 51  * @base: The base pointer to the gpio configuration registers.
 52  * @group: The group register number for gpio interrupt support.
 53  * @irq_base: The base irq number.
 54  * @config: special function and pull-resistor control information.
 55  * @lock: Lock for exclusive access to this gpio bank.
 56  * @pm_save: Save information for suspend/resume support.
 57  * @bitmap_gpio_int: Bitmap for representing GPIO interrupt or not.
 58  *
 59  * This wrapper provides the necessary information for the Samsung
 60  * specific gpios being registered with gpiolib.
 61  *
 62  * The lock protects each gpio bank from multiple access of the shared
 63  * configuration registers, or from reading of data whilst another thread
 64  * is writing to the register set.
 65  *
 66  * Each chip has its own lock to avoid any  contention between different
 67  * CPU cores trying to get one lock for different GPIO banks, where each
 68  * bank of GPIO has its own register space and configuration registers.
 69  */
 70 struct samsung_gpio_chip {
 71         struct gpio_chip        chip;
 72         struct samsung_gpio_cfg *config;
 73         struct samsung_gpio_pm  *pm;
 74         void __iomem            *base;
 75         int                     irq_base;
 76         int                     group;
 77         spinlock_t               lock;
 78 #ifdef CONFIG_PM
 79         u32                     pm_save[4];
 80 #endif
 81         u32                     bitmap_gpio_int;
 82 };
 83 
 84 static inline struct samsung_gpio_chip *to_samsung_gpio(struct gpio_chip *gpc)
 85 {
 86         return container_of(gpc, struct samsung_gpio_chip, chip);
 87 }
 88 
 89 /**
 90  * samsung_gpiolib_to_irq - convert gpio pin to irq number
 91  * @chip: The gpio chip that the pin belongs to.
 92  * @offset: The offset of the pin in the chip.
 93  *
 94  * This helper returns the irq number calculated from the chip->irq_base and
 95  * the provided offset.
 96  */
 97 extern int samsung_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset);
 98 
 99 /* exported for core SoC support to change */
100 extern struct samsung_gpio_cfg s3c24xx_gpiocfg_default;
101 
102 #ifdef CONFIG_S3C_GPIO_TRACK
103 extern struct samsung_gpio_chip *s3c_gpios[S3C_GPIO_END];
104 
105 static inline struct samsung_gpio_chip *samsung_gpiolib_getchip(unsigned int chip)
106 {
107         return (chip < S3C_GPIO_END) ? s3c_gpios[chip] : NULL;
108 }
109 #else
110 /* machine specific code should provide samsung_gpiolib_getchip */
111 
112 extern struct samsung_gpio_chip s3c24xx_gpios[];
113 
114 static inline struct samsung_gpio_chip *samsung_gpiolib_getchip(unsigned int pin)
115 {
116         struct samsung_gpio_chip *chip;
117 
118         if (pin > S3C_GPIO_END)
119                 return NULL;
120 
121         chip = &s3c24xx_gpios[pin/32];
122         return ((pin - chip->chip.base) < chip->chip.ngpio) ? chip : NULL;
123 }
124 
125 static inline void s3c_gpiolib_track(struct samsung_gpio_chip *chip) { }
126 #endif
127 
128 #ifdef CONFIG_PM
129 extern struct samsung_gpio_pm samsung_gpio_pm_1bit;
130 extern struct samsung_gpio_pm samsung_gpio_pm_2bit;
131 extern struct samsung_gpio_pm samsung_gpio_pm_4bit;
132 #define __gpio_pm(x) x
133 #else
134 #define samsung_gpio_pm_1bit NULL
135 #define samsung_gpio_pm_2bit NULL
136 #define samsung_gpio_pm_4bit NULL
137 #define __gpio_pm(x) NULL
138 
139 #endif /* CONFIG_PM */
140 
141 /* locking wrappers to deal with multiple access to the same gpio bank */
142 #define samsung_gpio_lock(_oc, _fl) spin_lock_irqsave(&(_oc)->lock, _fl)
143 #define samsung_gpio_unlock(_oc, _fl) spin_unlock_irqrestore(&(_oc)->lock, _fl)
144 
145 #endif /* __PLAT_SAMSUNG_GPIO_CORE_H */
146 

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