libethdrivers/src/plat/imx6/uboot/mxc_gpio.c

/*
 * Copyright (C) 2009 Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
 * Copyright (C) 2011 Stefano Babic, DENX Software Engineering, <sbabic@denx.de>
 * Copyright (C) 2020, HENSOLDT Cyber GmbH
 *
 * See U-Boot file CREDITS for list of people who contributed to this project.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include "common.h"
#include "imx-regs.h"
#include "gpio.h"
#include "../io.h"

enum mxc_gpio_direction {
    MXC_GPIO_DIRECTION_IN,
    MXC_GPIO_DIRECTION_OUT,
};

#define GPIO_TO_PORT(n)     (n / 32)

#define GPIO_SIZE 0x4000

/* GPIO port description */

#if defined(CONFIG_PLAT_IMX6)

static unsigned long gpio_ports[] = {
    [0] = 0,
    [1] = 0,
    [2] = 0,
    [3] = 0,
    [4] = 0,
    [5] = 0,
    [6] = 0,
};

static unsigned long gpio_paddr[] = {
    [0] = GPIO1_BASE_ADDR,
    [1] = GPIO2_BASE_ADDR,
    [2] = GPIO3_BASE_ADDR, /* Used by ethernet */
    [3] = GPIO4_BASE_ADDR,
    [4] = GPIO5_BASE_ADDR,
    [5] = GPIO6_BASE_ADDR,
    [6] = GPIO7_BASE_ADDR,
};

#elif defined(CONFIG_PLAT_IMX8MQ_EVK)

static unsigned long gpio_ports[] = {
    [0] = 0,
    [1] = 0,
    [2] = 0,
    [3] = 0,
    [4] = 0,
};

static unsigned long gpio_paddr[] = {
    [0] = 0x30200000,
    [1] = 0x30210000,
    [2] = 0x30220000,
    [3] = 0x30230000,
    [4] = 0x30240000,
};

#else
#error "unknown i.MX SOC"
#endif


static int mxc_gpio_direction(unsigned int gpio,
                              enum mxc_gpio_direction direction, ps_io_ops_t *io_ops)
{
    unsigned int port = GPIO_TO_PORT(gpio);
    struct gpio_regs *regs;
    uint32_t l;

    if (port >= ARRAY_SIZE(gpio_ports)) {
        ZF_LOGE("invalid GPIO port %u for pin %u", port, gpio);
        return -1;
    }

    gpio &= 0x1f;

    if (gpio_ports[port] == 0) {
        uintptr_t gpio_phys = (uintptr_t)gpio_paddr[port];
        gpio_ports[port] = (unsigned long)ps_io_map(&io_ops->io_mapper, gpio_phys, GPIO_SIZE, 0, PS_MEM_NORMAL);
        if (gpio_ports[port] == 0) {
            ZF_LOGE("No mapping for GPIO port %u of pin %u. Assuming it's already configured",
                    port, gpio);
            return 0;
        }
    }

    regs = (struct gpio_regs *)gpio_ports[port];
    l = readl(&regs->gpio_dir);

    switch (direction) {
    case MXC_GPIO_DIRECTION_OUT:
        l |= 1 << gpio;
        break;
    case MXC_GPIO_DIRECTION_IN:
        l &= ~(BIT(gpio));
    }
    writel(l, &regs->gpio_dir);

    return 0;
}

int gpio_set_value(unsigned gpio, int value)
{
    unsigned int port = GPIO_TO_PORT(gpio);
    struct gpio_regs *regs;
    uint32_t l;

    if (port >= ARRAY_SIZE(gpio_ports)) {
        ZF_LOGE("invalid GPIO port %u for pin %u", port, gpio);
        return -1;
    }

    gpio &= 0x1f;

    regs = (struct gpio_regs *)gpio_ports[port];

    l = readl(&regs->gpio_dr);
    if (value) {
        l |= 1 << gpio;
    } else {
        l &= ~(BIT(gpio));
    }
    writel(l, &regs->gpio_dr);

    return 0;
}

int gpio_get_value(unsigned gpio)
{
    unsigned int port = GPIO_TO_PORT(gpio);
    struct gpio_regs *regs;
    uint32_t val;

    if (port >= ARRAY_SIZE(gpio_ports)) {
        ZF_LOGE("invalid GPIO port %u for pin %u", port, gpio);
        return -1;
    }

    gpio &= 0x1f;

    regs = (struct gpio_regs *)gpio_ports[port];

    val = (readl(&regs->gpio_psr) >> gpio) & 0x01;

    return val;
}

int gpio_request(unsigned gpio, const char *label)
{
    unsigned int port = GPIO_TO_PORT(gpio);
    if (port >= ARRAY_SIZE(gpio_ports)) {
        ZF_LOGE("invalid GPIO port %u for pin %u", port, gpio);
        return -1;
    }
    return 0;
}

int gpio_free(unsigned gpio)
{
    return 0;
}

int gpio_direction_input(unsigned gpio, ps_io_ops_t *io_ops)
{
    return mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_IN, io_ops);
}

int gpio_direction_output(unsigned gpio, int value, ps_io_ops_t *io_ops)
{
    int ret = mxc_gpio_direction(gpio, MXC_GPIO_DIRECTION_OUT, io_ops);

    if (ret < 0) {
        ZF_LOGE("Could not set output direction for pin %u, code %u",
                gpio, ret);
        return ret;
    }

    return gpio_set_value(gpio, value);
}