/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2007-2009 coresystems GmbH
 *
 * 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.
 *
 * 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
 */

#include <types.h>
#include <device/device.h>
#include <console/console.h>
#if CONFIG_VGA_ROM_RUN
#include <x86emu/x86emu.h>
#endif
#include <pc80/mc146818rtc.h>
#include <arch/io.h>
#include <arch/interrupt.h>
#include <device/azalia_device.h>

#define BOOT_DISPLAY_DEFAULT	0
#define BOOT_DISPLAY_CRT	(1 << 0)
#define BOOT_DISPLAY_TV		(1 << 1)
#define BOOT_DISPLAY_EFP	(1 << 2)
#define BOOT_DISPLAY_LCD	(1 << 3)
#define BOOT_DISPLAY_CRT2	(1 << 4)
#define BOOT_DISPLAY_TV2	(1 << 5)
#define BOOT_DISPLAY_EFP2	(1 << 6)
#define BOOT_DISPLAY_LCD2	(1 << 7)

#if CONFIG_VGA_ROM_RUN
static int int15_handler(void)
{
	/* This int15 handler is Intel IGD. specific. Other chipsets need other
	 * handlers. The right way to do this is to move this handler code into
	 * the mainboard or northbridge code.
	 * TODO: completely move to mainboards / chipsets.
	 */
	printk(BIOS_DEBUG, "%s: AX=%04x BX=%04x CX=%04x DX=%04x\n",
			  __func__, X86_AX, X86_BX, X86_CX, X86_DX);

	switch (X86_AX) {
	case 0x5f35: /* Boot Display */
		X86_AX = 0x005f; // Success
		X86_CL = BOOT_DISPLAY_CRT;
		break;
	case 0x5f40: /* Boot Panel Type */
		// X86_AX = 0x015f; // Supported but failed
		X86_AX = 0x005f; // Success
		X86_CL = 3; // Display ID
		printk(BIOS_DEBUG, "DISPLAY=%x\n", X86_CL);
		break;
	default:
		/* Interrupt was not handled */
		printk(BIOS_DEBUG, "Unknown INT15 function %04x!\n", X86_AX);
		return 0;
	}

	/* Interrupt handled */
	return 1;
}
#endif

/* Hardware Monitor */

static u16 hwm_base = 0xa00;

static void hwm_write(u8 reg, u8 value)
{
	outb(reg, hwm_base + 0x05);
	outb(value, hwm_base + 0x06);
}

static void hwm_bank(u8 bank)
{
	hwm_write(0x4e, bank);
}

#define FAN_CRUISE_CONTROL_DISABLED	0
#define FAN_CRUISE_CONTROL_SPEED	1
#define FAN_CRUISE_CONTROL_THERMAL	2

#define FAN_SPEED_5625	0
//#define FAN_TEMPERATURE_30DEGC	0

struct fan_speed {
	u8 fan_in;
	u16 fan_speed;
};

// FANIN Target Speed Register
// FANIN = 337500 / RPM
struct fan_speed fan_speeds[] = {
	{ 0x3c, 5625 }, { 0x41, 5192 }, { 0x47, 4753 }, { 0x4e, 4326 },
	{ 0x56, 3924 }, { 0x5f, 3552 }, { 0x69, 3214 }, { 0x74, 2909 },
	{ 0x80, 2636 }, { 0x8d, 2393 }, { 0x9b, 2177 }, { 0xaa, 1985 },
	{ 0xba, 1814 }, { 0xcb, 1662 }, { 0xdd, 1527 }, { 0xf0, 1406 }
};

struct temperature {
	u8 deg_celsius;
	u8 deg_fahrenheit;
};

struct temperature temperatures[] = {
	{ 30,  86 }, { 33,  91 }, { 36,  96 }, { 39, 102 },
	{ 42, 107 }, { 45, 113 }, { 48, 118 }, { 51, 123 },
	{ 54, 129 }, { 57, 134 }, { 60, 140 }, { 63, 145 },
	{ 66, 150 }, { 69, 156 }, { 72, 161 }, { 75, 167 }
};

static void hwm_setup(void)
{
	int cpufan_control = 0, sysfan_control = 0;
	int cpufan_speed = 0, sysfan_speed = 0;
	int cpufan_temperature = 0, sysfan_temperature = 0;

	if (get_option(&cpufan_control, "cpufan_cruise_control") != CB_SUCCESS)
		cpufan_control = FAN_CRUISE_CONTROL_DISABLED;
	if (get_option(&cpufan_speed, "cpufan_speed") != CB_SUCCESS)
		cpufan_speed = FAN_SPEED_5625;
	//if (get_option(&cpufan_temperature, "cpufan_temperature") != CB_SUCCESS)
	//	cpufan_temperature = FAN_TEMPERATURE_30DEGC;

	if (get_option(&sysfan_control, "sysfan_cruise_control") != CB_SUCCESS)
		sysfan_control = FAN_CRUISE_CONTROL_DISABLED;
	if (get_option(&sysfan_speed, "sysfan_speed") != CB_SUCCESS)
		sysfan_speed = FAN_SPEED_5625;
	//if (get_option(&sysfan_temperature, "sysfan_temperature") != CB_SUCCESS)
	//	sysfan_temperature = FAN_TEMPERATURE_30DEGC;

	// hwm_write(0x31, 0x20); // AVCC high limit
	// hwm_write(0x34, 0x06); // VIN2 low limit

	hwm_bank(0);
	hwm_write(0x59, 0x20); // Diode Selection
	hwm_write(0x5d, 0x0f); // All Sensors Diode, not Thermistor

	hwm_bank(4);
	hwm_write(0x54, 0xf1); // SYSTIN temperature offset
	hwm_write(0x55, 0x19); // CPUTIN temperature offset
	hwm_write(0x56, 0xfc); // AUXTIN temperature offset

	hwm_bank(0x80); // Default

	u8 fan_config = 0;
	// 00 FANOUT is Manual Mode
	// 01 FANOUT is Thermal Cruise Mode
	// 10 FANOUT is Fan Speed Cruise Mode
	switch (cpufan_control) {
	case FAN_CRUISE_CONTROL_SPEED:	 fan_config |= (2 << 4); break;
	case FAN_CRUISE_CONTROL_THERMAL: fan_config |= (1 << 4); break;
	}
	switch (sysfan_control) {
	case FAN_CRUISE_CONTROL_SPEED:	 fan_config |= (2 << 2); break;
	case FAN_CRUISE_CONTROL_THERMAL: fan_config |= (1 << 2); break;
	}
	// This register must be written first
	hwm_write(0x04, fan_config);

	switch (cpufan_control) {
	case FAN_CRUISE_CONTROL_SPEED:
		printk(BIOS_DEBUG, "Fan Cruise Control setting CPU fan to %d RPM\n",
				fan_speeds[cpufan_speed].fan_speed);
		hwm_write(0x06, fan_speeds[cpufan_speed].fan_in);  // CPUFANIN target speed
		break;
	case FAN_CRUISE_CONTROL_THERMAL:
		printk(BIOS_DEBUG, "Fan Cruise Control setting CPU fan to activation at %d deg C/%d deg F\n",
				temperatures[cpufan_temperature].deg_celsius,
				temperatures[cpufan_temperature].deg_fahrenheit);
		hwm_write(0x06, temperatures[cpufan_temperature].deg_celsius);  // CPUFANIN target temperature
		break;
	}

	switch (sysfan_control) {
	case FAN_CRUISE_CONTROL_SPEED:
		printk(BIOS_DEBUG, "Fan Cruise Control setting system fan to %d RPM\n",
				fan_speeds[sysfan_speed].fan_speed);
		hwm_write(0x05, fan_speeds[sysfan_speed].fan_in);  // SYSFANIN target speed
		break;
	case FAN_CRUISE_CONTROL_THERMAL:
		printk(BIOS_DEBUG, "Fan Cruise Control setting system fan to activation at %d deg C/%d deg F\n",
				temperatures[sysfan_temperature].deg_celsius,
				temperatures[sysfan_temperature].deg_fahrenheit);
		hwm_write(0x05, temperatures[sysfan_temperature].deg_celsius); // SYSFANIN target temperature
		break;
	}

	hwm_write(0x0e, 0x02); // Fan Output Step Down Time
	hwm_write(0x0f, 0x02); // Fan Output Step Up Time

	hwm_write(0x47, 0xaf); // FAN divisor register
	hwm_write(0x4b, 0x84); // AUXFANIN speed divisor

	hwm_write(0x40, 0x01); // Init, but no SMI#
}

/* Audio Setup */

static void verb_setup(void)
{
	// Default VERB is fine on this mainboard.
	cim_verb_data = NULL;
	cim_verb_data_size = 0;
}

// mainboard_enable is executed as first thing after
// enumerate_buses().

static void mainboard_enable(device_t dev)
{
#if CONFIG_VGA_ROM_RUN
	/* Install custom int15 handler for VGA OPROM */
	mainboard_interrupt_handlers(0x15, &int15_handler);
#endif
	verb_setup();
	hwm_setup();
}

struct chip_operations mainboard_ops = {
	.enable_dev = mainboard_enable,
};
