bootblock.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <arch/io.h>
#include <endian.h>
#include <device/pnp_ops.h>
#include <device/pnp_def.h>
 
#include "bootblock.h"
 
#define PNP_CFG_IDX     0x2e
#define PNP_LDN_SERIAL  0x0d
 
static void pnp_enter_conf_state(pnp_devfn_t dev)
{
        outb(0x55, PNP_CFG_IDX);
        outb(0x55, PNP_CFG_IDX);
}
 
static void pnp_exit_conf_state(pnp_devfn_t dev)
{
        outb(0xaa, PNP_CFG_IDX);
}
 
static void wilco_ec_serial_init(void)
{
        pnp_devfn_t dev = PNP_DEV(PNP_CFG_IDX, PNP_LDN_SERIAL);
 
        pnp_enter_conf_state(dev);
        pnp_set_logical_device(dev);
        pnp_set_enable(dev, 1);
        pnp_set_iobase(dev, PNP_IDX_IO1, cpu_to_be16(CONFIG_TTYS0_BASE));
        pnp_write_config(dev, PNP_IDX_IO0, 1);
        pnp_exit_conf_state(dev);
}
 
void wilco_ec_early_init(void)
{
        if (CONFIG(DRIVERS_UART_8250IO))
                wilco_ec_serial_init();
}