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

1 files changed, 119 insertions, 0 deletions

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 <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/io.h>
+#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);
+}
+