// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2011 The Chromium OS Authors.
 */

/*
 * This provide a test serial port. It provides an emulated serial port where
 * a test program and read out the serial output and inject serial input for
 * U-Boot.
 */

#include <common.h>
#include <console.h>
#include <dm.h>
#include <lcd.h>
#include <os.h>
#include <serial.h>
#include <video.h>
#include <asm/global_data.h>
#include <linux/compiler.h>
#include <asm/serial.h>
#include <asm/state.h>

DECLARE_GLOBAL_DATA_PTR;

/**
 * output_ansi_colour() - Output an ANSI colour code
 *
 * @colour: Colour to output (0-7)
 */
static void output_ansi_colour(int colour)
{
        char ansi_code[] = "\x1b[1;3Xm";

        ansi_code[5] = '0' + colour;
        os_write(1, ansi_code, sizeof(ansi_code) - 1);
}

static void output_ansi_reset(void)
{
        os_write(1, "\x1b[0m", 4);
}

static int sandbox_serial_probe(struct udevice *dev)
{
        struct sandbox_state *state = state_get_current();
        struct sandbox_serial_priv *priv = dev_get_priv(dev);

        if (state->term_raw != STATE_TERM_COOKED)
                os_tty_raw(0, state->term_raw == STATE_TERM_RAW_WITH_SIGS);
        priv->start_of_line = 0;

        if (state->term_raw != STATE_TERM_RAW)
                disable_ctrlc(1);
        membuff_init(&priv->buf, priv->serial_buf, sizeof(priv->serial_buf));

        return 0;
}

static int sandbox_serial_remove(struct udevice *dev)
{
        struct sandbox_serial_plat *plat = dev_get_plat(dev);

        if (plat->colour != -1)
                output_ansi_reset();

        return 0;
}

static int sandbox_serial_putc(struct udevice *dev, const char ch)
{
        struct sandbox_serial_priv *priv = dev_get_priv(dev);
        struct sandbox_serial_plat *plat = dev_get_plat(dev);

        /* With of-platdata we don't real the colour correctly, so disable it */
        if (!CONFIG_IS_ENABLED(OF_PLATDATA) && priv->start_of_line &&
            plat->colour != -1) {
                priv->start_of_line = false;
                output_ansi_colour(plat->colour);
        }

        os_write(1, &ch, 1);
        if (ch == '\n')
                priv->start_of_line = true;

        return 0;
}

static int sandbox_serial_pending(struct udevice *dev, bool input)
{
        struct sandbox_serial_priv *priv = dev_get_priv(dev);
        ssize_t count;
        char *data;
        int avail;

        if (!input)
                return 0;

        os_usleep(100);
        if (!IS_ENABLED(CONFIG_SPL_BUILD))
                video_sync_all();
        avail = membuff_putraw(&priv->buf, 100, false, &data);
        if (!avail)
                return 1;       /* buffer full */

        count = os_read(0, data, avail);
        if (count > 0)
                membuff_putraw(&priv->buf, count, true, &data);

        return membuff_avail(&priv->buf);
}

static int sandbox_serial_getc(struct udevice *dev)
{
        struct sandbox_serial_priv *priv = dev_get_priv(dev);

        if (!sandbox_serial_pending(dev, true))
                return -EAGAIN; /* buffer empty */

        return membuff_getbyte(&priv->buf);
}

#ifdef CONFIG_DEBUG_UART_SANDBOX

#include <debug_uart.h>

static inline void _debug_uart_init(void)
{
}

static inline void _debug_uart_putc(int ch)
{
        os_putc(ch);
}

DEBUG_UART_FUNCS

#endif /* CONFIG_DEBUG_UART_SANDBOX */

static int sandbox_serial_getconfig(struct udevice *dev, uint *serial_config)
{
        uint config = SERIAL_DEFAULT_CONFIG;

        if (!serial_config)
                return -EINVAL;

        *serial_config = config;

        return 0;
}

static int sandbox_serial_setconfig(struct udevice *dev, uint serial_config)
{
        u8 parity = SERIAL_GET_PARITY(serial_config);
        u8 bits = SERIAL_GET_BITS(serial_config);
        u8 stop = SERIAL_GET_STOP(serial_config);

        if (bits != SERIAL_8_BITS || stop != SERIAL_ONE_STOP ||
            parity != SERIAL_PAR_NONE)
                return -ENOTSUPP; /* not supported in driver*/

        return 0;
}

static int sandbox_serial_getinfo(struct udevice *dev,
                                  struct serial_device_info *serial_info)
{
        struct serial_device_info info = {
                .type = SERIAL_CHIP_UNKNOWN,
                .addr_space = SERIAL_ADDRESS_SPACE_IO,
                .addr = SERIAL_DEFAULT_ADDRESS,
                .reg_width = 1,
                .reg_offset = 0,
                .reg_shift = 0,
                .clock = SERIAL_DEFAULT_CLOCK,
        };

        if (!serial_info)
                return -EINVAL;

        *serial_info = info;

        return 0;
}

static const char * const ansi_colour[] = {
        "black", "red", "green", "yellow", "blue", "megenta", "cyan",
        "white",
};

static int sandbox_serial_of_to_plat(struct udevice *dev)
{
        struct sandbox_serial_plat *plat = dev_get_plat(dev);
        const char *colour;
        int i;

        if (CONFIG_IS_ENABLED(OF_PLATDATA))
                return 0;
        plat->colour = -1;
        colour = dev_read_string(dev, "sandbox,text-colour");
        if (colour) {
                for (i = 0; i < ARRAY_SIZE(ansi_colour); i++) {
                        if (!strcmp(colour, ansi_colour[i])) {
                                plat->colour = i;
                                break;
                        }
                }
        }

        return 0;
}

static const struct dm_serial_ops sandbox_serial_ops = {
        .putc = sandbox_serial_putc,
        .pending = sandbox_serial_pending,
        .getc = sandbox_serial_getc,
        .getconfig = sandbox_serial_getconfig,
        .setconfig = sandbox_serial_setconfig,
        .getinfo = sandbox_serial_getinfo,
};

static const struct udevice_id sandbox_serial_ids[] = {
        { .compatible = "sandbox,serial" },
        { }
};

U_BOOT_DRIVER(sandbox_serial) = {
        .name   = "sandbox_serial",
        .id     = UCLASS_SERIAL,
        .of_match = sandbox_serial_ids,
        .of_to_plat = sandbox_serial_of_to_plat,
        .plat_auto      = sizeof(struct sandbox_serial_plat),
        .priv_auto      = sizeof(struct sandbox_serial_priv),
        .probe = sandbox_serial_probe,
        .remove = sandbox_serial_remove,
        .ops    = &sandbox_serial_ops,
        .flags = DM_FLAG_PRE_RELOC,
};

#if !CONFIG_IS_ENABLED(OF_PLATDATA)
static const struct sandbox_serial_plat platdata_non_fdt = {
        .colour = -1,
};

U_BOOT_DRVINFO(serial_sandbox_non_fdt) = {
        .name = "sandbox_serial",
        .plat = &platdata_non_fdt,
};
#endif