d87964c460
Move the GPIO suspend/resume support inline with the gpiolib support so that it will work with both the S3C24XX and S3C64XX series. The s3c_gpio_chip is extended to have a pm callback and a save block to keep the state of the GPIO over suspend, and the code from the s3c24xx implementation is added to a new common file. The suspend process now uses the list of registered chips to go through saving and restoring each one as appropriate, using the pm callback to select the appropriate routine depending on the type of control register present. This change also means that any additional GPIO added should not require changes to the PM. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/* linux/arch/arm/plat-s3c/include/plat/gpio-core.h
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*
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* Copyright 2008 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C Platform - GPIO core
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* Define the core gpiolib support functions that the s3c platforms may
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* need to extend or change depending on the hardware and the s3c chip
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* selected at build or found at run time.
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*
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* These definitions are not intended for driver inclusion, there is
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* nothing here that should not live outside the platform and core
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* specific code.
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*/
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struct s3c_gpio_chip;
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/**
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* struct s3c_gpio_pm - power management (suspend/resume) information
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* @save: Routine to save the state of the GPIO block
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* @resume: Routine to resume the GPIO block.
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*/
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struct s3c_gpio_pm {
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void (*save)(struct s3c_gpio_chip *chip);
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void (*resume)(struct s3c_gpio_chip *chip);
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};
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struct s3c_gpio_cfg;
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/**
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* struct s3c_gpio_chip - wrapper for specific implementation of gpio
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* @chip: The chip structure to be exported via gpiolib.
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* @base: The base pointer to the gpio configuration registers.
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* @config: special function and pull-resistor control information.
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* @pm_save: Save information for suspend/resume support.
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*
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* This wrapper provides the necessary information for the Samsung
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* specific gpios being registered with gpiolib.
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*/
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struct s3c_gpio_chip {
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struct gpio_chip chip;
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struct s3c_gpio_cfg *config;
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struct s3c_gpio_pm *pm;
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void __iomem *base;
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#ifdef CONFIG_PM
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u32 pm_save[4];
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#endif
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};
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static inline struct s3c_gpio_chip *to_s3c_gpio(struct gpio_chip *gpc)
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{
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return container_of(gpc, struct s3c_gpio_chip, chip);
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}
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/** s3c_gpiolib_add() - add the s3c specific version of a gpio_chip.
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* @chip: The chip to register
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*
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* This is a wrapper to gpiochip_add() that takes our specific gpio chip
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* information and makes the necessary alterations for the platform and
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* notes the information for use with the configuration systems and any
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* other parts of the system.
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*/
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extern void s3c_gpiolib_add(struct s3c_gpio_chip *chip);
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/* CONFIG_S3C_GPIO_TRACK enables the tracking of the s3c specific gpios
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* for use with the configuration calls, and other parts of the s3c gpiolib
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* support code.
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*
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* Not all s3c support code will need this, as some configurations of cpu
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* may only support one or two different configuration options and have an
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* easy gpio to s3c_gpio_chip mapping function. If this is the case, then
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* the machine support file should provide its own s3c_gpiolib_getchip()
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* and any other necessary functions.
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*/
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#ifdef CONFIG_S3C_GPIO_TRACK
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extern struct s3c_gpio_chip *s3c_gpios[S3C_GPIO_END];
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static inline struct s3c_gpio_chip *s3c_gpiolib_getchip(unsigned int chip)
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{
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return (chip < S3C_GPIO_END) ? s3c_gpios[chip] : NULL;
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}
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#else
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/* machine specific code should provide s3c_gpiolib_getchip */
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static inline void s3c_gpiolib_track(struct s3c_gpio_chip *chip) { }
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#endif
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#ifdef CONFIG_PM
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extern struct s3c_gpio_pm s3c_gpio_pm_1bit;
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extern struct s3c_gpio_pm s3c_gpio_pm_2bit;
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extern struct s3c_gpio_pm s3c_gpio_pm_4bit;
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#define __gpio_pm(x) x
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#else
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#define s3c_gpio_pm_1bit NULL
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#define s3c_gpio_pm_2bit NULL
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#define s3c_gpio_pm_4bit NULL
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#define __gpio_pm(x) NULL
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#endif /* CONFIG_PM */
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