A small utility to dump the RAM of a laptop's Embedded/Environmental
Controller. Nothing fancy, does not know any laptops, EC types, or what the values mean. It just dumps them. For the dump method, have a look at the ACPI 3.0b spec. Signed-off-by: Stefan Reinauer <stepan@coresystems.de> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4163 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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Stefan Reinauer
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119
util/ectool/ec.c
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119
util/ectool/ec.c
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/*
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* This file is part of the ectool project.
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*
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* Copyright (C) 2008-2009 coresystems GmbH
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; version 2 of
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* the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/io.h>
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#include "ec.h"
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extern int verbose;
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#define debug(x...) if (verbose) printf(x)
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int send_ec_command(uint8_t command)
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{
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int timeout;
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timeout = 0x7ff;
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while ((inb(EC_SC) & EC_IBF) && --timeout) {
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usleep(10);
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if ((timeout & 0xff) == 0)
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debug(".");
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}
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if (!timeout) {
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printf("Timeout while sending command 0x%02x to EC!\n",
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command);
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// return -1;
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}
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outb(command, EC_SC);
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return 0;
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}
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int send_ec_data(uint8_t data)
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{
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int timeout;
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timeout = 0x7ff;
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while ((inb(EC_SC) & EC_IBF) && --timeout) { // wait for IBF = 0
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usleep(10);
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if ((timeout & 0xff) == 0)
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debug(".");
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}
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if (!timeout) {
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printf("Timeout while sending data 0x%02x to EC!\n",
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data);
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// return -1;
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}
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outb(data, EC_DATA);
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return 0;
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}
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int send_ec_data_nowait(uint8_t data)
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{
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outb(data, EC_DATA);
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return 0;
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}
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uint8_t recv_ec_data(void)
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{
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int timeout;
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uint8_t data;
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timeout = 0x7fff;
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while (--timeout) { // Wait for OBF = 1
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if (inb(EC_SC) & EC_OBF) {
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break;
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}
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usleep(10);
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if ((timeout & 0xff) == 0)
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debug(".");
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}
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if (!timeout) {
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printf("\nTimeout while receiving data from EC!\n");
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// return -1;
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}
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data = inb(EC_DATA);
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debug("recv_ec_data: 0x%02x\n", data);
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return data;
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}
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uint8_t ec_read(uint8_t addr)
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{
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send_ec_command(0x80);
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send_ec_data(addr);
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return recv_ec_data();
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}
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int ec_write(uint8_t addr, uint8_t data)
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{
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send_ec_command(0x81);
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send_ec_data(addr);
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return send_ec_data(data);
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}
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