drivers/gpio/mxs_gpio.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Freescale i.MX28 GPIO control code
 *
 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
 * on behalf of DENX Software Engineering GmbH
 */

#include <common.h>
#include <linux/errno.h>
#include <asm/io.h>
#include <asm/arch/iomux.h>
#include <asm/arch/imx-regs.h>

#if	defined(CONFIG_MX23)
#define	PINCTRL_BANKS		3
#define	PINCTRL_DOUT(n)		(0x0500 + ((n) * 0x10))
#define	PINCTRL_DIN(n)		(0x0600 + ((n) * 0x10))
#define	PINCTRL_DOE(n)		(0x0700 + ((n) * 0x10))
#define	PINCTRL_PIN2IRQ(n)	(0x0800 + ((n) * 0x10))
#define	PINCTRL_IRQEN(n)	(0x0900 + ((n) * 0x10))
#define	PINCTRL_IRQSTAT(n)	(0x0c00 + ((n) * 0x10))
#elif	defined(CONFIG_MX28)
#define	PINCTRL_BANKS		5
#define	PINCTRL_DOUT(n)		(0x0700 + ((n) * 0x10))
#define	PINCTRL_DIN(n)		(0x0900 + ((n) * 0x10))
#define	PINCTRL_DOE(n)		(0x0b00 + ((n) * 0x10))
#define	PINCTRL_PIN2IRQ(n)	(0x1000 + ((n) * 0x10))
#define	PINCTRL_IRQEN(n)	(0x1100 + ((n) * 0x10))
#define	PINCTRL_IRQSTAT(n)	(0x1400 + ((n) * 0x10))
#else
#error "Please select CONFIG_MX23 or CONFIG_MX28"
#endif

#define GPIO_INT_FALL_EDGE	0x0
#define GPIO_INT_LOW_LEV	0x1
#define GPIO_INT_RISE_EDGE	0x2
#define GPIO_INT_HIGH_LEV	0x3
#define GPIO_INT_LEV_MASK	(1 << 0)
#define GPIO_INT_POL_MASK	(1 << 1)

void mxs_gpio_init(void)
{
	int i;

	for (i = 0; i < PINCTRL_BANKS; i++) {
		writel(0, MXS_PINCTRL_BASE + PINCTRL_PIN2IRQ(i));
		writel(0, MXS_PINCTRL_BASE + PINCTRL_IRQEN(i));
		/* Use SCT address here to clear the IRQSTAT bits */
		writel(0xffffffff, MXS_PINCTRL_BASE + PINCTRL_IRQSTAT(i) + 8);
	}
}

int gpio_get_value(unsigned gpio)
{
	uint32_t bank = PAD_BANK(gpio);
	uint32_t offset = PINCTRL_DIN(bank);
	struct mxs_register_32 *reg =
		(struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);

	return (readl(&reg->reg) >> PAD_PIN(gpio)) & 1;
}

void gpio_set_value(unsigned gpio, int value)
{
	uint32_t bank = PAD_BANK(gpio);
	uint32_t offset = PINCTRL_DOUT(bank);
	struct mxs_register_32 *reg =
		(struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);

	if (value)
		writel(1 << PAD_PIN(gpio), &reg->reg_set);
	else
		writel(1 << PAD_PIN(gpio), &reg->reg_clr);
}

int gpio_direction_input(unsigned gpio)
{
	uint32_t bank = PAD_BANK(gpio);
	uint32_t offset = PINCTRL_DOE(bank);
	struct mxs_register_32 *reg =
		(struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);

	writel(1 << PAD_PIN(gpio), &reg->reg_clr);

	return 0;
}

int gpio_direction_output(unsigned gpio, int value)
{
	uint32_t bank = PAD_BANK(gpio);
	uint32_t offset = PINCTRL_DOE(bank);
	struct mxs_register_32 *reg =
		(struct mxs_register_32 *)(MXS_PINCTRL_BASE + offset);

	gpio_set_value(gpio, value);

	writel(1 << PAD_PIN(gpio), &reg->reg_set);

	return 0;
}

int gpio_request(unsigned gpio, const char *label)
{
	if (PAD_BANK(gpio) >= PINCTRL_BANKS)
		return -1;

	return 0;
}

int gpio_free(unsigned gpio)
{
	return 0;
}

int name_to_gpio(const char *name)
{
	unsigned bank, pin;
	char *end;

	bank = simple_strtoul(name, &end, 10);

	if (!*end || *end != ':')
		return bank;

	pin = simple_strtoul(end + 1, NULL, 10);

	return (bank << MXS_PAD_BANK_SHIFT) | (pin << MXS_PAD_PIN_SHIFT);
}