| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2011 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. |
| */ |
| |
| #include <arch/io.h> |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <delay.h> |
| |
| #include "ec.h" |
| #include "chip.h" |
| |
| static u16 ec_cmd_reg = 0; |
| static u16 ec_data_reg = 0; |
| |
| static inline u8 __ec_read(u8 addr) |
| { |
| outb(addr, ec_cmd_reg); |
| return inb(ec_data_reg); |
| } |
| |
| static inline void __ec_write(u8 addr, u8 data) |
| { |
| outb(addr, ec_cmd_reg); |
| outb(data, ec_data_reg); |
| } |
| |
| static int ec_ready(void) |
| { |
| u16 timeout = EC_TIMEOUT; |
| |
| if (!ec_cmd_reg || !ec_data_reg) { |
| printk(BIOS_DEBUG, "Invalid ports: cmd=0x%x data=0x%x\n", |
| ec_cmd_reg, ec_data_reg); |
| return -1; |
| } |
| |
| while (__ec_read(EC_MAILBOX_COMMAND) != 0 && --timeout) { |
| udelay(10); |
| if ((timeout & 0xff) == 0) |
| printk(BIOS_SPEW, "."); |
| } |
| if (!timeout) { |
| printk(BIOS_DEBUG, "Timeout waiting for EC to be ready.\n"); |
| return -1; |
| } |
| return 0; |
| } |
| |
| int send_ec_command(u8 command) |
| { |
| if (ec_ready() < 0) |
| return -1; |
| __ec_write(EC_MAILBOX_COMMAND, command); |
| return ec_ready(); |
| } |
| |
| int send_ec_command_data(u8 command, u8 data) |
| { |
| if (ec_ready() < 0) |
| return -1; |
| __ec_write(EC_MAILBOX_DATA, data); |
| __ec_write(EC_MAILBOX_COMMAND, command); |
| return ec_ready(); |
| } |
| |
| u8 read_ec_command_byte(u8 command) |
| { |
| send_ec_command(command); |
| return __ec_read(EC_MAILBOX_DATA); |
| } |
| |
| u8 ec_read(u8 addr) |
| { |
| if (send_ec_command_data(EC_RAM_READ, addr) < 0) |
| return 0; |
| return __ec_read(EC_MAILBOX_DATA); |
| } |
| |
| int ec_write(u8 addr, u8 data) |
| { |
| if (ec_ready() < 0) |
| return -1; |
| __ec_write(EC_MAILBOX_DATA, addr); |
| __ec_write(EC_MAILBOX_DATA_H, data); |
| __ec_write(EC_MAILBOX_COMMAND, EC_RAM_WRITE); |
| return ec_ready(); |
| } |
| |
| void ec_set_bit(u8 addr, u8 bit) |
| { |
| ec_write(addr, ec_read(addr) | (1 << bit)); |
| } |
| |
| void ec_clr_bit(u8 addr, u8 bit) |
| { |
| ec_write(addr, ec_read(addr) & ~(1 << bit)); |
| } |
| |
| void ec_set_ports(u16 cmd_reg, u16 data_reg) |
| { |
| ec_cmd_reg = cmd_reg; |
| ec_data_reg = data_reg; |
| } |
| |
| #if !defined(__PRE_RAM__) && !defined(__SMM__) |
| static void mec1308_enable(struct device *dev) |
| { |
| struct ec_smsc_mec1308_config *conf = dev->chip_info; |
| |
| if (conf->mailbox_port) { |
| ec_cmd_reg = conf->mailbox_port; |
| ec_data_reg = conf->mailbox_port + 1; |
| } |
| } |
| |
| struct chip_operations ec_smsc_mec1308_ops = { |
| CHIP_NAME("SMSC MEC1308 EC Mailbox Interface") |
| .enable_dev = mec1308_enable |
| }; |
| #endif |