/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2011 Advanced Micro Devices, Inc.
 *
 * 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 <arch/io.h>
#include <device/pnp.h>
#include <superio/conf_mode.h>
#include <stdlib.h>
#include "nct5104d.h"
#include "chip.h"

static void set_irq_trigger_type(struct device *dev, bool trig_level)
{
	u8 reg10, reg11, reg26;

	//Before accessing CR10 OR CR11 Bit 4 in CR26 must be set to 1
	reg26 = pnp_read_config(dev, GLOBAL_OPTION_CR26);
	reg26 |= CR26_LOCK_REG;
	pnp_write_config(dev, GLOBAL_OPTION_CR26, reg26);

	switch(dev->path.pnp.device) {
	//SP1 (UARTA) IRQ type selection (1:level,0:edge) is controlled by CR 10, bit 5
	case NCT5104D_SP1:
		reg10 = pnp_read_config(dev, IRQ_TYPE_SEL_CR10);
		if (trig_level)
			reg10 |= (1 << 5);
		else
			reg10 &= ~(1 << 5);
		pnp_write_config(dev, IRQ_TYPE_SEL_CR10, reg10);
		break;
	//SP2 (UARTB) IRQ type selection (1:level,0:edge) is controlled by CR 10, bit 4
	case NCT5104D_SP2:
		reg10 = pnp_read_config(dev, IRQ_TYPE_SEL_CR10);
		if (trig_level)
			reg10 |= (1 << 4);
		else
			reg10 &= ~(1 << 4);
		pnp_write_config(dev, IRQ_TYPE_SEL_CR10, reg10);
		break;
	//SP3 (UARTC) IRQ type selection (1:level,0:edge) is controlled by CR 11, bit 5
	case NCT5104D_SP3:
		reg11 = pnp_read_config(dev,IRQ_TYPE_SEL_CR11);
		if (trig_level)
			reg11 |= (1 << 5);
		else
			reg11 &= ~(1 << 5);
		pnp_write_config(dev, IRQ_TYPE_SEL_CR11, reg11);
		break;
	//SP4 (UARTD) IRQ type selection (1:level,0:edge) is controlled by CR 11, bit 4
	case NCT5104D_SP4:
		reg11 = pnp_read_config(dev,IRQ_TYPE_SEL_CR11);
		if (trig_level)
			reg11 |= (1 << 4);
		else
			reg11 &= ~(1 << 4);
		pnp_write_config(dev, IRQ_TYPE_SEL_CR11, reg11);
		break;
	default:
		break;
	}

	//Clear access control register
	reg26 = pnp_read_config(dev, GLOBAL_OPTION_CR26);
	reg26 &= ~CR26_LOCK_REG;
	pnp_write_config(dev, GLOBAL_OPTION_CR26, reg26);
}

static void route_pins_to_uart(struct device *dev, bool to_uart)
{
	u8 reg;

	reg = pnp_read_config(dev, 0x1c);

	switch (dev->path.pnp.device) {
	case NCT5104D_SP3:
	case NCT5104D_GPIO0:
		/* Route pins 33 - 40. */
		if (to_uart)
			reg |= (1 << 3);
		else
			reg &= ~(1 << 3);
		break;
	case NCT5104D_SP4:
	case NCT5104D_GPIO1:
		/* Route pins 41 - 48. */
		if (to_uart)
			reg |= (1 << 2);
		else
			reg &= ~(1 << 2);
		break;
	default:
		break;
	}

	pnp_write_config(dev, 0x1c, reg);
}

static void nct5104d_init(struct device *dev)
{
	struct superio_nuvoton_nct5104d_config *conf = dev->chip_info;

	if (!dev->enabled)
		return;

	pnp_enter_conf_mode(dev);

	switch(dev->path.pnp.device) {
	case NCT5104D_SP1:
	case NCT5104D_SP2:
		set_irq_trigger_type(dev, conf->irq_trigger_type != 0);
		break;
	case NCT5104D_SP3:
	case NCT5104D_SP4:
		route_pins_to_uart(dev, true);
		set_irq_trigger_type(dev, conf->irq_trigger_type != 0);
		break;
	case NCT5104D_GPIO0:
	case NCT5104D_GPIO1:
		route_pins_to_uart(dev, false);
		break;
	default:
		break;
	}

	pnp_exit_conf_mode(dev);
}

static struct device_operations ops = {
	.read_resources   = pnp_read_resources,
	.set_resources    = pnp_set_resources,
	.enable_resources = pnp_enable_resources,
	.enable           = pnp_alt_enable,
	.init             = nct5104d_init,
	.ops_pnp_mode     = &pnp_conf_mode_8787_aa,
};

static struct pnp_info pnp_dev_info[] = {
	{ &ops, NCT5104D_FDC,  PNP_IO0 | PNP_IRQ0, {0x07f8, 0}, },
	{ &ops, NCT5104D_SP1,  PNP_IO0 | PNP_IRQ0, {0x07f8, 0}, },
	{ &ops, NCT5104D_SP2,  PNP_IO0 | PNP_IRQ0, {0x07f8, 0}, },
	{ &ops, NCT5104D_SP3,  PNP_IO0 | PNP_IRQ0, {0x07f8, 0}, },
	{ &ops, NCT5104D_SP4,  PNP_IO0 | PNP_IRQ0, {0x07f8, 0}, },
	{ &ops, NCT5104D_GPIO_WDT},
	{ &ops, NCT5104D_GPIO_PP_OD},
	{ &ops, NCT5104D_GPIO0},
	{ &ops, NCT5104D_GPIO1},
	{ &ops, NCT5104D_GPIO6},
	{ &ops, NCT5104D_PORT80},
};

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

struct chip_operations superio_nuvoton_nct5104d_ops = {
	CHIP_NAME("Nuvoton NCT5104D Super I/O")
	.enable_dev = enable_dev,
};