src/southbridge/intel/lynxpoint/acpi.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2007-2009 coresystems GmbH
 * Copyright (C) 2012 Chromium OS Authors
 *
 * 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 <arch/acpi.h>
#include <arch/acpigen.h>
#include <cbmem.h>
#include <types.h>
#include <string.h>
#include "pch.h"
#include "nvs.h"

void acpi_create_intel_hpet(acpi_hpet_t * hpet)
{
	acpi_header_t *header = &(hpet->header);
	acpi_addr_t *addr = &(hpet->addr);

	memset((void *) hpet, 0, sizeof(acpi_hpet_t));

	/* fill out header fields */
	memcpy(header->signature, "HPET", 4);
	memcpy(header->oem_id, OEM_ID, 6);
	memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8);
	memcpy(header->asl_compiler_id, ASLC, 4);

	header->length = sizeof(acpi_hpet_t);
	header->revision = 1;

	/* fill out HPET address */
	addr->space_id = 0;	/* Memory */
	addr->bit_width = 64;
	addr->bit_offset = 0;
	addr->addrl = (unsigned long long)HPET_ADDR & 0xffffffff;
	addr->addrh = (unsigned long long)HPET_ADDR >> 32;

	hpet->id = 0x8086a201;	/* Intel */
	hpet->number = 0x00;
	hpet->min_tick = 0x0080;

	header->checksum =
	    acpi_checksum((void *) hpet, sizeof(acpi_hpet_t));
}

static int acpi_create_serialio_ssdt_entry(int id, global_nvs_t *gnvs)
{
	char sio_name[5] = {};
	sprintf(sio_name, "S%1uEN", id);
	return acpigen_write_name_byte(sio_name, gnvs->s0b[id] ? 1 : 0);
}

void acpi_create_serialio_ssdt(acpi_header_t *ssdt)
{
	unsigned long current = (unsigned long)ssdt + sizeof(acpi_header_t);
	global_nvs_t *gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
	int id, len = 0;

	if (!gnvs)
		return;

	/* Fill the SSDT header */
	memset((void *)ssdt, 0, sizeof(acpi_header_t));
	memcpy(&ssdt->signature, "SSDT", 4);
	ssdt->revision = 2;
	memcpy(&ssdt->oem_id, OEM_ID, 6);
	memcpy(&ssdt->oem_table_id, ACPI_TABLE_CREATOR, 8);
	ssdt->oem_revision = 42;
	memcpy(&ssdt->asl_compiler_id, ASLC, 4);
	ssdt->asl_compiler_revision = 42;
	ssdt->length = sizeof(acpi_header_t);
	acpigen_set_current((char *) current);

	/* Fill the SSDT with an entry for each SerialIO device */
	for (id = 0; id < 8; id++)
		len += acpi_create_serialio_ssdt_entry(id, gnvs);

	/* (Re)calculate length and checksum. */
	current = (unsigned long)acpigen_get_current();
	ssdt->length = current - (unsigned long)ssdt;
	ssdt->checksum = acpi_checksum((void *)ssdt, ssdt->length);
}