Add EC component for SMSC MEC1308/1310

Change-Id: I92109fb633a1a3090b4b1767dd119b8c8a1b5f81
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/828
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 135 insertions, 0 deletions

diff --git a/src/ec/smsc/mec1308/ec.c b/src/ec/smsc/mec1308/ec.c
new file mode 100644
index 0000000000..bfd3c14bca
--- /dev/null
+++ b/src/ec/smsc/mec1308/ec.c
@@ -0,0 +1,135 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 The Chromium OS Authors. All rights reserved.
+ *
+ * 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"
+#include "chip.h"
+
+static u16 ec_cmd_reg = 0;
+static u16 ec_data_reg = 0;
+
+static inline u8 __ec_read(u8 addr)
+{
+	outb(addr, ec_cmd_reg);
+	return inb(ec_data_reg);
+}
+
+static inline void __ec_write(u8 addr, u8 data)
+{
+	outb(addr, ec_cmd_reg);
+	outb(data, ec_data_reg);
+}
+
+static int ec_ready(void)
+{
+	u16 timeout = EC_TIMEOUT;
+
+	if (!ec_cmd_reg || !ec_data_reg) {
+		printk(BIOS_DEBUG, "Invalid ports: cmd=0x%x data=0x%x\n",
+		       ec_cmd_reg, ec_data_reg);
+		return -1;
+	}
+
+	while (__ec_read(EC_MAILBOX_COMMAND) != 0 && --timeout) {
+		udelay(10);
+		if ((timeout & 0xff) == 0)
+			printk(BIOS_SPEW, ".");
+	}
+	if (!timeout) {
+		printk(BIOS_DEBUG, "Timeout waiting for EC to be ready.\n");
+		return -1;
+	}
+	return 0;
+}
+
+int send_ec_command(u8 command)
+{
+	if (ec_ready() < 0)
+		return -1;
+	__ec_write(EC_MAILBOX_COMMAND, command);
+	return ec_ready();
+}
+
+int send_ec_command_data(u8 command, u8 data)
+{
+	if (ec_ready() < 0)
+		return -1;
+	__ec_write(EC_MAILBOX_DATA, data);
+	__ec_write(EC_MAILBOX_COMMAND, command);
+	return ec_ready();
+}
+
+u8 read_ec_command_byte(u8 command)
+{
+	send_ec_command(command);
+	return __ec_read(EC_MAILBOX_DATA);
+}
+
+u8 ec_read(u8 addr)
+{
+	if (send_ec_command_data(EC_RAM_READ, addr) < 0)
+		return 0;
+	return __ec_read(EC_MAILBOX_DATA);
+}
+
+int ec_write(u8 addr, u8 data)
+{
+	if (ec_ready() < 0)
+		return -1;
+	__ec_write(EC_MAILBOX_DATA, addr);
+	__ec_write(EC_MAILBOX_DATA_H, data);
+	__ec_write(EC_MAILBOX_COMMAND, EC_RAM_WRITE);
+	return ec_ready();
+}
+
+void ec_set_bit(u8 addr, u8 bit)
+{
+	ec_write(addr, ec_read(addr) | (1 << bit));
+}
+
+void ec_clr_bit(u8 addr, u8 bit)
+{
+	ec_write(addr, ec_read(addr) &  ~(1 << bit));
+}
+
+void ec_set_ports(u16 cmd_reg, u16 data_reg)
+{
+	ec_cmd_reg = cmd_reg;
+	ec_data_reg = data_reg;
+}
+
+static void mec1308_enable(device_t dev)
+{
+	struct ec_smsc_mec1308_config *conf = dev->chip_info;
+
+	if (conf->mailbox_port) {
+		ec_cmd_reg = conf->mailbox_port;
+		ec_data_reg = conf->mailbox_port + 1;
+	}
+}
+
+struct chip_operations ec_smsc_mec1308_ops = {
+	CHIP_NAME("SMSC MEC1308 EC Mailbox Interface")
+	.enable_dev = mec1308_enable
+};