src/ec/roda/it8518/ec.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2015 secunet Security Networks AG
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <console/console.h>
#include <device/device.h>
#include <device/pnp.h>
#include <pc80/keyboard.h>
#include <ec/acpi/ec.h>
#include <stdlib.h>
#include <delay.h>

#include "chip.h"

static void it8518_init(struct device *dev)
{
	const struct ec_roda_it8518_config *const conf = dev->chip_info;

	if (!dev->enabled)
		return;

	printk(BIOS_DEBUG, "Roda IT8518: Initializing keyboard.\n");
	pc_keyboard_init(NO_AUX_DEVICE);

	if (conf && conf->cpuhot_limit) {
		/* The EC may take very long for the first command on a
		   cold boot (~180ms witnessed). Since we need an incre-
		   dibly long timeout, we do this EC RAM write manually. */
		int timeout = 50000;	/* 50,000 * 10us = 500ms */
		send_ec_command(0x81);
		while (ec_status() & EC_IBF && --timeout)
			udelay(10);
		send_ec_data(0xb2);
		send_ec_data(conf->cpuhot_limit);
	}
}

static struct device_operations ops = {
	.init             = it8518_init,
	.read_resources   = DEVICE_NOOP,
	.enable_resources = DEVICE_NOOP,
};

static struct pnp_info pnp_dev_info[] = {
	{ &ops, 0, 0, 0, }
};

static void enable_dev(struct device *dev)
{
	pnp_enable_devices(dev, &pnp_ops, ARRAY_SIZE(pnp_dev_info),
			   pnp_dev_info);
}

struct chip_operations ec_roda_it8518_ops = {
	CHIP_NAME("Roda IT8518 EC")
	.enable_dev = enable_dev
};