/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2012 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; 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 <arch/io.h>
#include <timestamp.h>
#include <cpu/x86/tsc.h>
#include "i82801ix.h"

uint64_t get_initial_timestamp(void)
{
	tsc_t base_time = {
		.lo = pci_read_config32(PCI_DEV(0, 0x00, 0), 0xdc),
		.hi = pci_read_config32(PCI_DEV(0, 0x1f, 2), 0xd0)
	};
	return tsc_to_uint64(base_time);
}

void i82801ix_early_init(void)
{
	const pci_devfn_t d31f0 = PCI_DEV(0, 0x1f, 0);

	/* Set up RCBA. */
	pci_write_config32(d31f0, D31F0_RCBA, (uintptr_t)DEFAULT_RCBA | 1);

	/* Set up PMBASE. */
	pci_write_config32(d31f0, D31F0_PMBASE, DEFAULT_PMBASE | 1);
	/* Enable PMBASE. */
	pci_write_config8(d31f0, D31F0_ACPI_CNTL, 0x80);

	/* Set up GPIOBASE. */
	pci_write_config32(d31f0, D31F0_GPIO_BASE, DEFAULT_GPIOBASE);
	/* Enable GPIO. */
	pci_write_config8(d31f0, D31F0_GPIO_CNTL,
			  pci_read_config8(d31f0, D31F0_GPIO_CNTL) | 0x10);

	/* Reset watchdog. */
	outw(0x0008, DEFAULT_TCOBASE + 0x04); /* R/WC, clear TCO caused SMI. */
	outw(0x0002, DEFAULT_TCOBASE + 0x06); /* R/WC, clear second timeout. */

	/* Enable upper 128bytes of CMOS. */
	RCBA32(0x3400) = (1 << 2);

	/* Initialize power management initialization
	   register early as it affects reboot behavior. */
	/* Bit 20 activates global reset of host and ME on cf9 writes of 0x6
	   and 0xe (required if ME is disabled but present), bit 31 locks it.
	   The other bits are 'must write'. */
	u8 reg8 = pci_read_config8(d31f0, 0xac);
	reg8 |= (1 << 31) | (1 << 30) | (1 << 20) | (3 << 8);
	pci_write_config8(d31f0, 0xac, reg8);

	/* TODO: If RTC power failed, reset RTC state machine
	         (set, then reset RTC 0x0b bit7) */

	/* TODO: Check power state bits in GEN_PMCON_2 (D31F0 0xa2)
	         before they get cleared. */
}
