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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* This file is part of the coreboot project. */
#include <arch/io.h>
#include <device/pnp_ops.h>
#include <device/pnp_def.h>
#include <stdint.h>
#include "smscsuperio.h"
#define SMSC_ENTRY_KEY 0x55
#define SMSC_EXIT_KEY 0xAA
/* Enable configuration: pass entry key '0x87' into index port dev. */
static void pnp_enter_conf_state(pnp_devfn_t dev)
{
u16 port = dev >> 8;
outb(SMSC_ENTRY_KEY, port);
}
/* Disable configuration: pass exit key '0xAA' into index port dev. */
static void pnp_exit_conf_state(pnp_devfn_t dev)
{
u16 port = dev >> 8;
outb(SMSC_EXIT_KEY, port);
}
/**
* Enable the specified serial port.
*
* @param dev The device to use.
* @param iobase The I/O base of the serial port (usually 0x3f8/0x2f8).
*/
void smscsuperio_enable_serial(pnp_devfn_t dev, u16 iobase)
{
pnp_enter_conf_state(dev);
pnp_set_logical_device(dev);
pnp_set_enable(dev, 0);
pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
switch (iobase) {
case 0x03f8:
pnp_set_irq(dev, PNP_IDX_IRQ0, 4);
break;
case 0x02f8:
pnp_set_irq(dev, PNP_IDX_IRQ0, 3);
break;
}
pnp_set_enable(dev, 1);
pnp_exit_conf_state(dev);
}
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