Release 4.14 arch/blackfin/mach-bf538/ext-gpio.c

/*
 * GPIOLIB interface for BF538/9 PORT C, D, and E GPIOs
 *
 * Copyright 2009-2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <asm/blackfin.h>
#include <asm/portmux.h>


#define DEFINE_REG(reg, off) \
static inline u16 read_##reg(void __iomem *port) \
        { return bfin_read16(port + off); } \
static inline void write_##reg(void __iomem *port, u16 v) \
        { bfin_write16(port + off, v); }

DEFINE_REG(PORTIO, 0x00)
DEFINE_REG(PORTIO_CLEAR, 0x10)
DEFINE_REG(PORTIO_SET, 0x20)
DEFINE_REG(PORTIO_DIR, 0x40)
DEFINE_REG(PORTIO_INEN, 0x50)



static void __iomem *gpio_chip_to_mmr(struct gpio_chip *chip)
{
	switch (chip->base) {
	default: /* not really needed, but keeps gcc happy */
	case GPIO_PC0: return (void __iomem *)PORTCIO;
	case GPIO_PD0: return (void __iomem *)PORTDIO;
	case GPIO_PE0: return (void __iomem *)PORTEIO;
	}
}

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static int bf538_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
	void __iomem *port = gpio_chip_to_mmr(chip);
	return !!(read_PORTIO(port) & (1u << gpio));
}

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static void bf538_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
{
	void __iomem *port = gpio_chip_to_mmr(chip);
	if (value)
		write_PORTIO_SET(port, (1u << gpio));
	else
		write_PORTIO_CLEAR(port, (1u << gpio));
}

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static int bf538_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
	void __iomem *port = gpio_chip_to_mmr(chip);
	write_PORTIO_DIR(port, read_PORTIO_DIR(port) & ~(1u << gpio));
	write_PORTIO_INEN(port, read_PORTIO_INEN(port) | (1u << gpio));
	return 0;
}

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static int bf538_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value)
{
	void __iomem *port = gpio_chip_to_mmr(chip);
	write_PORTIO_INEN(port, read_PORTIO_INEN(port) & ~(1u << gpio));
	bf538_gpio_set_value(port, gpio, value);
	write_PORTIO_DIR(port, read_PORTIO_DIR(port) | (1u << gpio));
	return 0;
}

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static int bf538_gpio_request(struct gpio_chip *chip, unsigned gpio)
{
	return bfin_special_gpio_request(chip->base + gpio, chip->label);
}

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static void bf538_gpio_free(struct gpio_chip *chip, unsigned gpio)
{
	return bfin_special_gpio_free(chip->base + gpio);
}

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/* We don't set the irq fields as these banks cannot generate interrupts */


static struct gpio_chip bf538_portc_chip = {
	.label = "GPIO-PC",
	.direction_input = bf538_gpio_direction_input,
	.get = bf538_gpio_get_value,
	.direction_output = bf538_gpio_direction_output,
	.set = bf538_gpio_set_value,
	.request = bf538_gpio_request,
	.free = bf538_gpio_free,
	.base = GPIO_PC0,
	.ngpio = GPIO_PC9 - GPIO_PC0 + 1,
};


static struct gpio_chip bf538_portd_chip = {
	.label = "GPIO-PD",
	.direction_input = bf538_gpio_direction_input,
	.get = bf538_gpio_get_value,
	.direction_output = bf538_gpio_direction_output,
	.set = bf538_gpio_set_value,
	.request = bf538_gpio_request,
	.free = bf538_gpio_free,
	.base = GPIO_PD0,
	.ngpio = GPIO_PD13 - GPIO_PD0 + 1,
};


static struct gpio_chip bf538_porte_chip = {
	.label = "GPIO-PE",
	.direction_input = bf538_gpio_direction_input,
	.get = bf538_gpio_get_value,
	.direction_output = bf538_gpio_direction_output,
	.set = bf538_gpio_set_value,
	.request = bf538_gpio_request,
	.free = bf538_gpio_free,
	.base = GPIO_PE0,
	.ngpio = GPIO_PE15 - GPIO_PE0 + 1,
};



static int __init bf538_extgpio_setup(void)
{
	return gpiochip_add_data(&bf538_portc_chip, NULL) |
		gpiochip_add_data(&bf538_portd_chip, NULL) |
		gpiochip_add_data(&bf538_porte_chip, NULL);
}
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arch_initcall(bf538_extgpio_setup);

#ifdef CONFIG_PM
static struct {
	


u16 data, dir, inen;

} gpio_bank_saved[3];


static void __iomem * const port_bases[3] = {
	(void *)PORTCIO,
	(void *)PORTDIO,
	(void *)PORTEIO,
};



void bfin_special_gpio_pm_hibernate_suspend(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(port_bases); ++i) {
		gpio_bank_saved[i].data = read_PORTIO(port_bases[i]);
		gpio_bank_saved[i].inen = read_PORTIO_INEN(port_bases[i]);
		gpio_bank_saved[i].dir = read_PORTIO_DIR(port_bases[i]);
	}
}

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void bfin_special_gpio_pm_hibernate_restore(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(port_bases); ++i) {
		write_PORTIO_INEN(port_bases[i], gpio_bank_saved[i].inen);
		write_PORTIO_SET(port_bases[i],
			gpio_bank_saved[i].data & gpio_bank_saved[i].dir);
		write_PORTIO_DIR(port_bases[i], gpio_bank_saved[i].dir);
	}
}
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#endif
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Directory: arch/blackfin/mach-bf538

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