/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
 * Copyright (C) 2016 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; 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.
 */

#include <stdlib.h>
#include <arch/io.h>
#include <console/console.h>
#include <delay.h>

#include "env_ctrl.h"
#include "env_ctrl_chip.h"

static inline u8 ite_ec_read(const u16 base, const u8 addr)
{
	outb(addr, base + 5);
	return inb(base + 6);
}

static inline void ite_ec_write(const u16 base, const u8 addr, const u8 value)
{
	outb(addr, base + 5);
	outb(value, base + 6);
}

static void extemp_force_idle_status(const u16 base)
{
	u8 reg;
	int retries = 10;

	/* Wait up to 10ms for non-busy state. */
	while (retries > 0) {
		reg = ite_ec_read(base, ITE_EC_EXTEMP_STATUS);

		if ((reg & ITE_EC_EXTEMP_STATUS_HOST_BUSY) == 0x0)
			break;

		retries--;

		mdelay(1);
	}

	if (retries == 0 && (reg & ITE_EC_EXTEMP_STATUS_HOST_BUSY) == 0x1) {
		/*
		 * SIO is busy due to unfinished peci transaction.
		 * Re-configure Register 0x8E to terminate processes.
		 */
		ite_ec_write(base, ITE_EC_EXTEMP_CONTROL,
			ITE_EC_EXTEMP_CTRL_AUTO_4HZ |
			ITE_EC_EXTEMP_CTRL_AUTO_START);
	}
}

/*
 * Setup External Temperature to read via PECI into TMPINx register
 */
static void enable_peci(const u16 base, const u8 tmpin)
{
	if (tmpin == 0 || tmpin > ITE_EC_TMPIN_CNT)
		return;

	/* Enable PECI interface */
	ite_ec_write(base, ITE_EC_INTERFACE_SELECT,
			   ITE_EC_INTERFACE_SEL_PECI |
			   ITE_EC_INTERFACE_SPEED_TOLERANCE);

	/* Setup External Temperature using PECI GetTemp */
	ite_ec_write(base, ITE_EC_EXTEMP_ADDRESS,
			   PECI_CLIENT_ADDRESS);
	ite_ec_write(base, ITE_EC_EXTEMP_COMMAND,
			   PECI_GETTEMP_COMMAND);
	ite_ec_write(base, ITE_EC_EXTEMP_WRITE_LENGTH,
			   PECI_GETTEMP_WRITE_LENGTH);
	ite_ec_write(base, ITE_EC_EXTEMP_READ_LENGTH,
			   PECI_GETTEMP_READ_LENGTH);
	ite_ec_write(base, ITE_EC_EXTEMP_CONTROL,
			   ITE_EC_EXTEMP_CTRL_AUTO_4HZ |
			   ITE_EC_EXTEMP_CTRL_AUTO_START);

	/* External Temperature reported in TMPINx register */
	ite_ec_write(base, ITE_EC_ADC_TEMP_CHANNEL_ENABLE,
			   (tmpin & 3) << 6);
}

/*
 * Set up External Temperature to read via thermal diode/resistor
 * into TMPINx register
 */
static void enable_tmpin(const u16 base, const u8 tmpin,
			 const enum ite_ec_thermal_mode mode)
{
	u8 reg;

	reg = ite_ec_read(base, ITE_EC_ADC_TEMP_CHANNEL_ENABLE);

	switch (mode) {
	case THERMAL_DIODE:
		reg |= ITE_EC_ADC_TEMP_DIODE_MODE(tmpin);
		break;
	case THERMAL_RESISTOR:
		reg |= ITE_EC_ADC_TEMP_RESISTOR_MODE(tmpin);
		break;
	default:
		printk(BIOS_WARNING,
		       "Unsupported thermal mode 0x%x on TMPIN%d\n",
		       mode, tmpin);
		return;
	}

	ite_ec_write(base, ITE_EC_ADC_TEMP_CHANNEL_ENABLE, reg);

	/* Enable the startup of monitoring operation */
	reg = ite_ec_read(base, ITE_EC_CONFIGURATION);
	reg |= ITE_EC_CONFIGURATION_START;
	ite_ec_write(base, ITE_EC_CONFIGURATION, reg);
}

static void fan_smartconfig(const u16 base, const u8 fan,
			    const enum ite_ec_fan_mode mode,
			    const struct ite_ec_fan_smartconfig *const conf)
{
	u8 pwm_ctrl;
	u8 pwm_start = 0;
	u8 pwm_auto = 0;

	if (mode == FAN_SMART_SOFTWARE) {
		pwm_ctrl = ITE_EC_FAN_CTL_PWM_MODE_SOFTWARE;

		/* 50% duty cycle by default */
		const u8 duty = conf->pwm_start ? conf->pwm_start : 50;
		if (IS_ENABLED(CONFIG_SUPERIO_ITE_ENV_CTRL_8BIT_PWM))
			pwm_start = ITE_EC_FAN_CTL_PWM_DUTY(duty);
		else
			pwm_ctrl |= ITE_EC_FAN_CTL_PWM_DUTY(duty);
	} else {
		pwm_ctrl = ITE_EC_FAN_CTL_PWM_MODE_AUTOMATIC;
		pwm_ctrl |= ITE_EC_FAN_CTL_TEMPIN(conf->tmpin);

		pwm_start = ITE_EC_FAN_CTL_PWM_START_DUTY(conf->pwm_start);
		pwm_start |= ITE_EC_FAN_CTL_PWM_SLOPE_BIT6(conf->slope);

		pwm_auto = ITE_EC_FAN_CTL_PWM_SLOPE_LOWER(conf->slope);
		if (conf->smoothing)
			pwm_auto |= ITE_EC_FAN_CTL_AUTO_SMOOTHING_EN;

		ite_ec_write(base, ITE_EC_FAN_CTL_TEMP_LIMIT_OFF(fan),
			     conf->tmp_off);
		ite_ec_write(base, ITE_EC_FAN_CTL_TEMP_LIMIT_START(fan),
			     conf->tmp_start);
		/* Full speed above 127°C by default */
		ite_ec_write(base, ITE_EC_FAN_CTL_TEMP_LIMIT_FULL(fan),
			     conf->tmp_full ? conf->tmp_full : 127);
		ite_ec_write(base, ITE_EC_FAN_CTL_DELTA_TEMP(fan),
			     ITE_EC_FAN_CTL_DELTA_TEMP_INTRVL(conf->tmp_delta));
	}

	ite_ec_write(base, ITE_EC_FAN_CTL_PWM_CONTROL(fan), pwm_ctrl);
	ite_ec_write(base, ITE_EC_FAN_CTL_PWM_START(fan), pwm_start);
	ite_ec_write(base, ITE_EC_FAN_CTL_PWM_AUTO(fan), pwm_auto);
}

static void enable_fan(const u16 base, const u8 fan,
		       const struct ite_ec_fan_config *const conf)
{
	u8 reg;

	if (conf->mode == FAN_IGNORE)
		return;

	/* FAN_CTL2 might have its own frequency setting */
	if (IS_ENABLED(CONFIG_SUPERIO_ITE_ENV_CTRL_PWM_FREQ2) && fan == 2) {
		reg = ite_ec_read(base, ITE_EC_ADC_TEMP_EXTRA_CHANNEL_ENABLE);
		reg &= ~ITE_EC_FAN_PWM_CLOCK_MASK;
		reg |= ITE_EC_FAN_PWM_DEFAULT_CLOCK;
		ite_ec_write(base, ITE_EC_ADC_TEMP_EXTRA_CHANNEL_ENABLE, reg);
	}

	if (conf->mode >= FAN_SMART_SOFTWARE) {
		fan_smartconfig(base, fan, conf->mode, &conf->smart);
	} else {
		reg = ite_ec_read(base, ITE_EC_FAN_CTL_MODE);
		if (conf->mode == FAN_MODE_ON)
			reg |= ITE_EC_FAN_CTL_ON(fan);
		else
			reg &= ~ITE_EC_FAN_CTL_ON(fan);
		ite_ec_write(base, ITE_EC_FAN_CTL_MODE, reg);
	}

	if (IS_ENABLED(SUPERIO_ITE_ENV_CTRL_FAN16_CONFIG)
	    && conf->mode >= FAN_MODE_ON) {
		reg = ite_ec_read(base, ITE_EC_FAN_TAC_COUNTER_ENABLE);
		reg |= ITE_EC_FAN_TAC_16BIT_ENABLE(fan);
		ite_ec_write(base, ITE_EC_FAN_TAC_COUNTER_ENABLE, reg);
	}

	reg = ite_ec_read(base, ITE_EC_FAN_MAIN_CTL);
	if (conf->mode >= FAN_MODE_ON)
		reg |= ITE_EC_FAN_MAIN_CTL_TAC_EN(fan);
	else
		reg &= ~ITE_EC_FAN_MAIN_CTL_TAC_EN(fan);
	if (conf->mode >= FAN_SMART_SOFTWARE)
		reg |= ITE_EC_FAN_MAIN_CTL_SMART(fan);
	else
		reg &= ~ITE_EC_FAN_MAIN_CTL_SMART(fan);
	ite_ec_write(base, ITE_EC_FAN_MAIN_CTL, reg);
}

void ite_ec_init(const u16 base, const struct ite_ec_config *const conf)
{
	size_t i;

	/* Configure 23.43kHz PWM active high output */
	u8 fan_ctl = ite_ec_read(base, ITE_EC_FAN_CTL_MODE);
	fan_ctl &= ~ITE_EC_FAN_PWM_CLOCK_MASK;
	fan_ctl |= ITE_EC_FAN_PWM_DEFAULT_CLOCK;
	fan_ctl |= ITE_EC_FAN_CTL_POLARITY_HIGH;
	ite_ec_write(base, ITE_EC_FAN_CTL_MODE, fan_ctl);

	/* Enable PECI if configured */
	enable_peci(base, conf->peci_tmpin);

	/* Enable HWM if configured */
	for (i = 0; i < ITE_EC_TMPIN_CNT; ++i)
		enable_tmpin(base, i + 1, conf->tmpin_mode[i]);

	/* Enable reading of voltage pins */
	ite_ec_write(base, ITE_EC_ADC_VOLTAGE_CHANNEL_ENABLE, conf->vin_mask);

	/* Enable FANx if configured */
	for (i = 0; i < ITE_EC_FAN_CNT; ++i)
		enable_fan(base, i + 1, &conf->fan[i]);

	/*
	 * System may get wrong temperature data when SIO is in
	 * busy state. Therefore, check the status and terminate
	 * processes if needed.
	 */
	if (conf->peci_tmpin != 0)
		extemp_force_idle_status(base);
}
