Add new ec subdir for Embedded Controllers and common ACPI EC support

Adds a new src/ec subdir for embedded controllers (mostly found in laptops)
and converts Getac P470 and Roda RK886EX to use the new ACPI EC instead
of having their own copies of those functions.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Acked-by: Peter Stuge <peter@stuge.se>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6304 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 118 insertions, 0 deletions

diff --git a/src/ec/acpi/ec.c b/src/ec/acpi/ec.c
new file mode 100644
index 0000000000..7a01b7e455
--- /dev/null
+++ b/src/ec/acpi/ec.c
@@ -0,0 +1,118 @@
+/*
+ * 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")
+};