From b5ab323a4036d86654c562b957d12f4dd4789bde Mon Sep 17 00:00:00 2001 From: Stefan Reinauer Date: Wed, 22 Apr 2009 07:23:00 +0000 Subject: 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 Acked-by: Uwe Hermann git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4163 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- util/ectool/ec.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 119 insertions(+) create mode 100644 util/ectool/ec.c (limited to 'util/ectool/ec.c') diff --git a/util/ectool/ec.c b/util/ectool/ec.c new file mode 100644 index 0000000000..9fa81258b7 --- /dev/null +++ b/util/ectool/ec.c @@ -0,0 +1,119 @@ +/* + * This file is part of the ectool 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 +#include +#include +#include +#include "ec.h" + +extern int verbose; + +#define debug(x...) if (verbose) printf(x) + +int send_ec_command(uint8_t command) +{ + int timeout; + + timeout = 0x7ff; + while ((inb(EC_SC) & EC_IBF) && --timeout) { + usleep(10); + if ((timeout & 0xff) == 0) + debug("."); + } + if (!timeout) { + printf("Timeout while sending command 0x%02x to EC!\n", + command); + // return -1; + } + + outb(command, EC_SC); + return 0; +} + +int send_ec_data(uint8_t data) +{ + int timeout; + + timeout = 0x7ff; + while ((inb(EC_SC) & EC_IBF) && --timeout) { // wait for IBF = 0 + usleep(10); + if ((timeout & 0xff) == 0) + debug("."); + } + if (!timeout) { + printf("Timeout while sending data 0x%02x to EC!\n", + data); + // return -1; + } + + outb(data, EC_DATA); + + return 0; +} + +int send_ec_data_nowait(uint8_t data) +{ + outb(data, EC_DATA); + + return 0; +} + +uint8_t recv_ec_data(void) +{ + int timeout; + uint8_t data; + + timeout = 0x7fff; + while (--timeout) { // Wait for OBF = 1 + if (inb(EC_SC) & EC_OBF) { + break; + } + usleep(10); + if ((timeout & 0xff) == 0) + debug("."); + } + if (!timeout) { + printf("\nTimeout while receiving data from EC!\n"); + // return -1; + } + + data = inb(EC_DATA); + debug("recv_ec_data: 0x%02x\n", data); + + return data; +} + +uint8_t ec_read(uint8_t addr) +{ + send_ec_command(0x80); + send_ec_data(addr); + + return recv_ec_data(); +} + +int ec_write(uint8_t addr, uint8_t data) +{ + send_ec_command(0x81); + send_ec_data(addr); + return send_ec_data(data); +} + -- cgit v1.2.3