src/mainboard/compulab/intense_pc/early_init.c

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

#include <bootblock_common.h>
#include <stdint.h>
#include <arch/io.h>
#include <superio/smsc/sio1007/sio1007.h>
#include <southbridge/intel/bd82x6x/pch.h>

#define SIO_PORT 0x164e

void bootblock_mainboard_early_init(void)
{
	const u16 port = SIO_PORT;
	const u16 runtime_port = 0x180;

	/* Enable COM1 if requested */
	if (CONFIG(DRIVERS_UART_8250IO))
		sio1007_enable_uart_at(port);

	/* Turn on configuration mode. */
	outb(0x55, port);

	/* Set the GPIO direction, polarity, and type. */
	sio1007_setreg(port, 0x31, 1 << 0, 1 << 0);
	sio1007_setreg(port, 0x32, 0 << 0, 1 << 0);
	sio1007_setreg(port, 0x33, 0 << 0, 1 << 0);

	/* Set the base address for the runtime register block. */
	sio1007_setreg(port, 0x30, runtime_port >> 4, 0xff);
	sio1007_setreg(port, 0x21, runtime_port >> 12, 0xff);

	/* Turn on address decoding for it. */
	sio1007_setreg(port, 0x3a, 1 << 1, 1 << 1);

	/* Set the value of GPIO 10 by changing GP1, bit 0. */
	u8 byte;
	byte = inb(runtime_port + 0xc);
	byte |= (1 << 0);
	outb(byte, runtime_port + 0xc);

	/* Turn off address decoding for it. */
	sio1007_setreg(port, 0x3a, 0 << 1, 1 << 1);

	/* Turn off configuration mode. */
	outb(0xaa, port);
}