/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2013 Rudolf Marek <r.marek@assembler.cz>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#if defined(__i386__) || defined(__x86_64__)

#include "flash.h"
#include "programmer.h"
#include "hwaccess.h"
#include "spi.h"

/* same as serverengines */
static void enter_conf_mode_ec(uint16_t port)
{
	outb(0x5a, port);
}

static void exit_conf_mode_ec(uint16_t port)
{
	outb(0xa5, port);
}

static uint16_t get_sio_port(struct pci_dev *dev)
{
	uint16_t ec_port;

	if (!dev) {
		return 0;
	}

	if (!(pci_read_byte(dev, 0x40) & (1 << 7)))
		return 0;

	ec_port = pci_read_word(dev, 0xa4);

	if (!(ec_port & 0x1))
		return 0;

	ec_port &= ~0x1;

	return ec_port;
}


static void write_data(uint16_t port, uint8_t off, uint8_t data)
{
	outb(off, port);
	outb(data, port + 1);
}

static uint8_t read_data(uint16_t port, uint8_t off)
{
	outb(off, port);
	return inb(port + 1);
}


static uint16_t get_mbox_port(uint16_t sio_port)
{
	uint16_t mbox_port;

	enter_conf_mode_ec(sio_port);

	/* go to LDN 9, mailbox */
	write_data(sio_port, 7, 9);

	/* MBOX not active ? */
	if (!(read_data(sio_port, 0x30) & 1)) {
		exit_conf_mode_ec(sio_port);
		return 0;
	}

	mbox_port = read_data(sio_port, 0x60) << 8;
	mbox_port |= read_data(sio_port, 0x61);

	exit_conf_mode_ec(sio_port);
	return mbox_port;
}

static int mbox_wait_ack(uint16_t mbox_port)
{
	int i;

	for (i = 0; i < 10; i++) {
		/* sleep 1ms */
		programmer_delay(1000);
		if (read_data(mbox_port, 0x82) == 0xfa) {
			return 0;
		}
	}
	msg_pinfo("IMC MBOX: Timeout!\n");
	return 1;

}

static int send_cmd(uint16_t mbox_port, uint8_t cmd)
{
	write_data(mbox_port, 0x82, 0x0);
	write_data(mbox_port, 0x83, cmd);
	/* trigger transfer 0x96 with subcommand cmd */
	write_data(mbox_port, 0x80, 0x96);

	return mbox_wait_ack(mbox_port);
}

static int imc_cmd(struct pci_dev *dev, uint8_t cmd)
{
	uint16_t sio_port;
	uint16_t mbox_port;
	sio_port = get_sio_port(dev);

	if (!sio_port)
		return -1;

	msg_pdbg("\nEC SIO is at 0x%x\n", sio_port);

	mbox_port = get_mbox_port(sio_port);

	if (!mbox_port)
		return -1;

	msg_pdbg("EC MBOX is at 0x%x\n", mbox_port);

	/* put IMC to sleep */
	return send_cmd(mbox_port, cmd);
}

static int imc_try_resume(void *data)
{
	struct pci_dev *dev = data;
	int ret = imc_cmd(dev, 0xb5);

	msg_pinfo("(IMC resume%s)\n", ret ? " failed!" : "d");
	return ret;
}

int imc_try_shutdown(struct pci_dev *dev)
{
	int ret = imc_cmd(dev, 0xb4);

	/* No IMC active, fake OK */
	if (ret < 0)
		return 0;

	msg_pinfo("(Shutting down IMC%s)\n", ret ? " failed!" : "");

	/* restore IMC on exit */
	if ((!ret) && (register_shutdown(imc_try_resume, dev)))
		return 1;

	return ret;
}

#endif