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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2008-2009 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.
*
* 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 <console/console.h>
#include <device/device.h>
#include <arch/io.h>
#include <delay.h>
#include "ec.h"
int send_ec_command(u8 command)
{
int timeout;
timeout = 0x7ff;
while ((inb(EC_SC) & EC_IBF) && --timeout) {
udelay(10);
if ((timeout & 0xff) == 0)
printk(BIOS_SPEW, ".");
}
if (!timeout) {
printk(BIOS_DEBUG, "Timeout while sending command 0x%02x to EC!\n",
command);
// return -1;
}
outb(command, EC_SC);
return 0;
}
int send_ec_data(u8 data)
{
int timeout;
timeout = 0x7ff;
while ((inb(EC_SC) & EC_IBF) && --timeout) { // wait for IBF = 0
udelay(10);
if ((timeout & 0xff) == 0)
printk(BIOS_SPEW, ".");
}
if (!timeout) {
printk(BIOS_DEBUG, "Timeout while sending data 0x%02x to EC!\n",
data);
// return -1;
}
outb(data, EC_DATA);
return 0;
}
int send_ec_data_nowait(u8 data)
{
outb(data, EC_DATA);
return 0;
}
u8 recv_ec_data(void)
{
int timeout;
u8 data;
timeout = 0x7fff;
while (--timeout) { // Wait for OBF = 1
if (inb(EC_SC) & EC_OBF) {
break;
}
udelay(10);
if ((timeout & 0xff) == 0)
printk(BIOS_SPEW, ".");
}
if (!timeout) {
printk(BIOS_DEBUG, "\nTimeout while receiving data from EC!\n");
// return -1;
}
data = inb(EC_DATA);
printk(BIOS_DEBUG, "recv_ec_data: 0x%02x\n", data);
return data;
}
u8 ec_read(u8 addr)
{
send_ec_command(0x80);
send_ec_data(addr);
return recv_ec_data();
}
int ec_write(u8 addr, u8 data)
{
send_ec_command(0x81);
send_ec_data(addr);
return send_ec_data(data);
}
struct chip_operations ec_acpi_ops = {
CHIP_NAME("ACPI Embedded Controller")
};
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