/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2007-2010 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.
 */

#include <stdint.h>
#include <cf9_reset.h>
#include <device/pnp_ops.h>
#include <device/pci_ops.h>
#include <console/console.h>
#include <arch/romstage.h>
#include <cpu/x86/lapic.h>
#include <device/pci_def.h>
#include <device/pnp_def.h>
#include <northbridge/intel/i945/i945.h>
#include <northbridge/intel/i945/raminit.h>
#include <southbridge/intel/i82801gx/i82801gx.h>
#include <superio/winbond/common/winbond.h>
#include <superio/winbond/w83627ehg/w83627ehg.h>
#include <southbridge/intel/common/pmclib.h>

#define SERIAL_DEV PNP_DEV(0x4e, W83627EHG_SP1)
#define SUPERIO_DEV PNP_DEV(0x4e, 0)

static void ich7_enable_lpc(void)
{
	// Enable Serial IRQ
	pci_write_config8(PCI_DEV(0, 0x1f, 0), SERIRQ_CNTL, 0xd0);
	// Set COM1/COM2 decode range
	pci_write_config16(PCI_DEV(0, 0x1f, 0), LPC_IO_DEC, 0x0010);
	// Enable COM1/COM2/KBD/SuperIO1+2
	pci_write_config16(PCI_DEV(0, 0x1f, 0), LPC_EN, CNF2_LPC_EN
			| CNF1_LPC_EN | KBC_LPC_EN | FDD_LPC_EN | COMA_LPC_EN
			| COMB_LPC_EN);
	// Enable HWM at 0x290
	pci_write_config32(PCI_DEV(0, 0x1f, 0), GEN1_DEC, 0x00fc0291);
	// io 0x300 decode
	pci_write_config32(PCI_DEV(0, 0x1f, 0), GEN4_DEC, 0x00000301);
}

/* This box has one superio
 * Also set up the GPIOs from the beginning. This is the "no schematic
 * but safe anyways" method.
 */
static void early_superio_config_w83627ehg(void)
{
	pnp_devfn_t dev;

	dev = SUPERIO_DEV;
	pnp_enter_conf_state(dev);

	pnp_write_config(dev, 0x24, 0xc4); // PNPCVS

	pnp_write_config(dev, 0x29, 0x01); // GPIO settings
	pnp_write_config(dev, 0x2a, 0x40); // GPIO settings should be fc but gets set to 02
	pnp_write_config(dev, 0x2b, 0xc0); // GPIO settings?
	pnp_write_config(dev, 0x2c, 0x03); // GPIO settings?
	pnp_write_config(dev, 0x2d, 0x20); // GPIO settings?

	dev = PNP_DEV(0x4e, W83627EHG_SP1);
	pnp_set_logical_device(dev);
	pnp_set_enable(dev, 0);
	pnp_set_iobase(dev, PNP_IDX_IO0, 0x3f8);
	pnp_set_irq(dev, PNP_IDX_IRQ0, 4);
	pnp_set_enable(dev, 1);

	dev = PNP_DEV(0x4e, W83627EHG_SP2);
	pnp_set_logical_device(dev);
	pnp_set_enable(dev, 0);
	pnp_set_iobase(dev, PNP_IDX_IO0, 0x2f8);
	pnp_set_irq(dev, PNP_IDX_IRQ0, 3);
	// pnp_write_config(dev, 0xf1, 4); // IRMODE0
	pnp_set_enable(dev, 1);

	dev = PNP_DEV(0x4e, W83627EHG_KBC); // Keyboard
	pnp_set_logical_device(dev);
	pnp_set_enable(dev, 0);
	pnp_set_iobase(dev, PNP_IDX_IO0, 0x60);
	pnp_set_iobase(dev, PNP_IDX_IO1, 0x64);
	//pnp_write_config(dev, 0xf0, 0x82);
	pnp_set_enable(dev, 1);

	dev = PNP_DEV(0x4e, W83627EHG_GPIO2);
	pnp_set_logical_device(dev);
	pnp_set_enable(dev, 1); // Just enable it

	dev = PNP_DEV(0x4e, W83627EHG_GPIO3);
	pnp_set_logical_device(dev);
	pnp_set_enable(dev, 0);
	pnp_write_config(dev, 0xf0, 0xfb); // GPIO bit 2 is output
	pnp_write_config(dev, 0xf1, 0x00); // GPIO bit 2 is 0
	pnp_write_config(dev, 0x30, 0x03); // Enable GPIO3+4. pnp_set_enable is not sufficient

	dev = PNP_DEV(0x4e, W83627EHG_FDC);
	pnp_set_logical_device(dev);
	pnp_set_enable(dev, 0);

	dev = PNP_DEV(0x4e, W83627EHG_PP);
	pnp_set_logical_device(dev);
	pnp_set_enable(dev, 0);

	/* Enable HWM */
	dev = PNP_DEV(0x4e, W83627EHG_HWM);
	pnp_set_logical_device(dev);
	pnp_set_enable(dev, 0);
	pnp_set_iobase(dev, PNP_IDX_IO0, 0xa00);
	pnp_set_enable(dev, 1);

	pnp_exit_conf_state(dev);
}

static void rcba_config(void)
{
	/* Set up virtual channel 0 */
	//RCBA32(0x0014) = 0x80000001;

	/* Device 1f interrupt pin register */
	RCBA32(D31IP) = 0x00042210;
	/* Device 1d interrupt pin register */
	RCBA32(D28IP) = 0x00214321;

	/* dev irq route register */
	RCBA16(D31IR) = 0x0132;
	RCBA16(D30IR) = 0x0146;
	RCBA16(D29IR) = 0x0237;
	RCBA16(D28IR) = 0x3201;
	RCBA16(D27IR) = 0x0146;

	/* Enable IOAPIC */
	RCBA8(OIC) = 0x03;

	/* Enable PCIe Root Port Clock Gate */
	// RCBA32(0x341c) = 0x00000001;
}

static void early_ich7_init(void)
{
	uint8_t reg8;
	uint32_t reg32;

	// program secondary mlt XXX byte?
	pci_write_config8(PCI_DEV(0, 0x1e, 0), SMLT, 0x20);

	// reset rtc power status
	reg8 = pci_read_config8(PCI_DEV(0, 0x1f, 0), GEN_PMCON_3);
	reg8 &= ~RTC_BATTERY_DEAD;
	pci_write_config8(PCI_DEV(0, 0x1f, 0), GEN_PMCON_3, reg8);

	// usb transient disconnect
	reg8 = pci_read_config8(PCI_DEV(0, 0x1f, 0), 0xad);
	reg8 |= (3 << 0);
	pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xad, reg8);

	reg32 = pci_read_config32(PCI_DEV(0, 0x1d, 7), 0xfc);
	reg32 |= (1 << 29) | (1 << 17);
	pci_write_config32(PCI_DEV(0, 0x1d, 7), 0xfc, reg32);

	reg32 = pci_read_config32(PCI_DEV(0, 0x1d, 7), 0xdc);
	reg32 |= (1 << 31) | (1 << 27);
	pci_write_config32(PCI_DEV(0, 0x1d, 7), 0xdc, reg32);

	ich7_setup_cir();
}

void mainboard_romstage_entry(void)
{
	int s3resume = 0;

	enable_lapic();

	ich7_enable_lpc();
	early_superio_config_w83627ehg();

	/* Set up the console */
	console_init();

	if (MCHBAR16(SSKPD) == 0xCAFE) {
		printk(BIOS_DEBUG, "soft reset detected, rebooting properly\n");
		system_reset();
	}

	/* Perform some early chipset initialization required
	 * before RAM initialization can work
	 */
	i945_early_initialization();

	s3resume = southbridge_detect_s3_resume();

	/* Enable SPD ROMs and DDR-II DRAM */
	enable_smbus();

	if (CONFIG(DEBUG_RAM_SETUP))
		dump_spd_registers();

	sdram_initialize(s3resume ? 2 : 0, NULL);

	/* Perform some initialization that must run before stage2 */
	early_ich7_init();

	/* This should probably go away. Until now it is required
	 * and mainboard specific
	 */
	rcba_config();

	/* Chipset Errata! */
	fixup_i945_errata();

	/* Initialize the internal PCIe links before we go into stage2 */
	i945_late_initialization(s3resume);
}