1 /* linux/arch/arm/plat-s3c/include/plat/gpio-core.h
3 * Copyright 2008 Simtec Electronics
4 * http://armlinux.simtec.co.uk/
5 * Ben Dooks <ben@simtec.co.uk>
7 * S3C Platform - GPIO core
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.
14 #define GPIOCON_OFF (0x00)
15 #define GPIODAT_OFF (0x04)
17 #define con_4bit_shift(__off) ((__off) * 4)
19 /* Define the core gpiolib support functions that the s3c platforms may
20 * need to extend or change depending on the hardware and the s3c chip
21 * selected at build or found at run time.
23 * These definitions are not intended for driver inclusion, there is
24 * nothing here that should not live outside the platform and core
31 * struct s3c_gpio_pm - power management (suspend/resume) information
32 * @save: Routine to save the state of the GPIO block
33 * @resume: Routine to resume the GPIO block.
36 void (*save)(struct s3c_gpio_chip *chip);
37 void (*resume)(struct s3c_gpio_chip *chip);
43 * struct s3c_gpio_chip - wrapper for specific implementation of gpio
44 * @chip: The chip structure to be exported via gpiolib.
45 * @base: The base pointer to the gpio configuration registers.
46 * @config: special function and pull-resistor control information.
47 * @pm_save: Save information for suspend/resume support.
49 * This wrapper provides the necessary information for the Samsung
50 * specific gpios being registered with gpiolib.
52 struct s3c_gpio_chip {
53 struct gpio_chip chip;
54 struct s3c_gpio_cfg *config;
55 struct s3c_gpio_pm *pm;
62 static inline struct s3c_gpio_chip *to_s3c_gpio(struct gpio_chip *gpc)
64 return container_of(gpc, struct s3c_gpio_chip, chip);
67 /** s3c_gpiolib_add() - add the s3c specific version of a gpio_chip.
68 * @chip: The chip to register
70 * This is a wrapper to gpiochip_add() that takes our specific gpio chip
71 * information and makes the necessary alterations for the platform and
72 * notes the information for use with the configuration systems and any
73 * other parts of the system.
75 extern void s3c_gpiolib_add(struct s3c_gpio_chip *chip);
77 /* CONFIG_S3C_GPIO_TRACK enables the tracking of the s3c specific gpios
78 * for use with the configuration calls, and other parts of the s3c gpiolib
81 * Not all s3c support code will need this, as some configurations of cpu
82 * may only support one or two different configuration options and have an
83 * easy gpio to s3c_gpio_chip mapping function. If this is the case, then
84 * the machine support file should provide its own s3c_gpiolib_getchip()
85 * and any other necessary functions.
89 * samsung_gpiolib_add_4bit_chips - 4bit single register GPIO config.
90 * @chip: The gpio chip that is being configured.
91 * @nr_chips: The no of chips (gpio ports) for the GPIO being configured.
93 * This helper deal with the GPIO cases where the control register has 4 bits
94 * of control per GPIO, generally in the form of:
97 * others = Special functions (dependant on bank)
99 * Note, since the code to deal with the case where there are two control
100 * registers instead of one, we do not have a seperate set of function
101 * (samsung_gpiolib_add_4bit2_chips)for each case.
103 extern void samsung_gpiolib_add_4bit_chips(struct s3c_gpio_chip *chip,
105 extern void samsung_gpiolib_add_4bit2_chips(struct s3c_gpio_chip *chip,
108 extern void samsung_gpiolib_add_4bit(struct s3c_gpio_chip *chip);
109 extern void samsung_gpiolib_add_4bit2(struct s3c_gpio_chip *chip);
111 #ifdef CONFIG_S3C_GPIO_TRACK
112 extern struct s3c_gpio_chip *s3c_gpios[S3C_GPIO_END];
114 static inline struct s3c_gpio_chip *s3c_gpiolib_getchip(unsigned int chip)
116 return (chip < S3C_GPIO_END) ? s3c_gpios[chip] : NULL;
119 /* machine specific code should provide s3c_gpiolib_getchip */
121 #include <mach/gpio-track.h>
123 static inline void s3c_gpiolib_track(struct s3c_gpio_chip *chip) { }
127 extern struct s3c_gpio_pm s3c_gpio_pm_1bit;
128 extern struct s3c_gpio_pm s3c_gpio_pm_2bit;
129 extern struct s3c_gpio_pm s3c_gpio_pm_4bit;
130 #define __gpio_pm(x) x
132 #define s3c_gpio_pm_1bit NULL
133 #define s3c_gpio_pm_2bit NULL
134 #define s3c_gpio_pm_4bit NULL
135 #define __gpio_pm(x) NULL
137 #endif /* CONFIG_PM */