/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2012 The Chromium OS Authors. All rights reserved.
 *
 * 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
 */

/*
 * EC communication interface for QUANTA IT8518 Embedded Controller.
 */

#ifndef _EC_QUANTA_IT8518_EC_H
#define _EC_QUANTA_IT8518_EC_H

#define EC_IO 0x100 /* Mainboard specific. Could be Kconfig option */
#define EC_IO_HIGH EC_IO + 1
#define EC_IO_LOW  EC_IO + 2
#define EC_IO_DATA EC_IO + 3

/* Wait 400ms for keyboard controller answers */
#define KBC_TIMEOUT_IN_MS           400

// 60h/64h Command Interface
#define KBD_DATA                    0x60
#define KBD_COMMAND                 0x64
#define KBD_STATUS                  0x64
#define   KBD_IBF                   (1 << 1) // 1: input buffer full (data ready for ec)
#define   KBD_OBF                   (1 << 0) // 1: output buffer full (data ready for host)

#define EC_KBD_CMD_UNMUTE           0xE8
#define EC_KBD_CMD_MUTE             0xE9

u8 ec_kbc_read_ob(void);
void ec_kbc_write_cmd(u8 cmd);
void ec_kbc_write_ib(u8 data);

// 62h/66h Command Interface
#define EC_DATA        0x62
#define EC_SC          0x66	// Status & Control Register
#define   SMI_EVT      (1 << 6)	// 1: SMI event was triggered
#define   SCI_EVT      (1 << 5) // 1: SCI event was triggered

// EC Commands (defined in ec_function_spec v3.12)
#define RD_EC          0x80
#define WR_EC          0x81
#define QR_EC          0x84

#define EC_CMD_EXIT_BOOT_BLOCK      0x85
#define EC_CMD_NOTIFY_ACPI_ENTER    0x86
#define EC_CMD_NOTIFY_ACPI_EXIT     0x87
#define EC_CMD_WARM_RESET           0x8C

#define EC_FW_VER                   0xE8 // 2 Bytes
#define EC_IF_MIN_VER               0xEB
#define EC_STATUS_REG               0xEC
#define EC_IF_MAJ_VER               0xEF

// EC 0.83b added status bits:
//  BIT0=EC in RO mode
//  BIT1=Recovery Key Sequence Detected
#define EC_IN_RO_MODE               0x1
#define EC_IN_RECOVERY_MODE         0x3

u8 ec_read_ob(void);
void ec_write_cmd(u8 cmd);
void ec_write_ib(u8 data);

u8 ec_read(u16 addr);
void ec_write(u16 addr, u8 data);
u8 ec_it8518_get_event(void);

#endif /* _EC_QUANTA_IT8518_EC_H */