/* SPDX-License-Identifier: GPL-2.0-only */

#include <arch/io.h>
#include <device/pnp.h>
#include <device/pnp_def.h>
#include <device/pnp_ops.h>
#include <superio/smsc/ece5048/ece5048.h>

static void pnp_enter_conf_state(pnp_devfn_t dev)
{
	unsigned int port = dev >> 8;
	outb(0x55, port);
}

static void pnp_exit_conf_state(pnp_devfn_t dev)
{
	unsigned int port = dev >> 8;
	outb(0xaa, port);
}

// both E6230 and E7240 uses port 0x94e
void ece5048_early_init(u16 port)
{
    pnp_devfn_t dev;

    outb(0x55, port);
    outb(0x55, port);

    pnp_write_config(port << 8, 0x22, 0x10);
    pnp_write_config(port << 8, 0x23, 0x10);
    pnp_write_config(port << 8, 0x24, 4);
    pnp_write_config(port << 8, 0x25, 4);

    dev = PNP_DEV(port, 3);
    pnp_set_logical_device(dev);
    pnp_set_enable(dev, 0);

    dev = PNP_DEV(port, 12);
    pnp_set_logical_device(dev);
    pnp_set_enable(dev, 1);
    pnp_set_iobase(dev, PNP_IDX_IO0, 0x928); // is it for all laptops?

    outb(0xaa, port);
}

/* FIXME: XXX this should be used in ramstage/smm? */
/* TODO: use 4e/4f in ACPI? */
void ece5048_enable_serial(pnp_devfn_t dev, u16 iobase)
{
	pnp_enter_conf_state(dev);

	pnp_write_config(dev, 0x22, pnp_read_config(dev, 0x22) | 0x10);
	pnp_write_config(dev, 0x23, pnp_read_config(dev, 0x23) | 0x10);

	pnp_set_logical_device(dev);

	pnp_set_enable(dev, 1);
	pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
	pnp_set_irq(dev, PNP_IDX_IRQ0, 4);

	pnp_exit_conf_state(dev);
}