ec/kontron/it8516e: Add it8516e EC driver

This driver communicates with the IT8516e on the Kontron KTQM77.
Since we don't know if the firmware and protocol are standard for
the chip or customized to the board, call it kontron/it8516e.

Change-Id: I7382172c6d865d60106c929124444821a07a5184
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/3390
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 115 insertions, 0 deletions

diff --git a/src/ec/kontron/it8516e/acpi/pm_channels.asl b/src/ec/kontron/it8516e/acpi/pm_channels.asl
new file mode 100644
index 0000000000..f18ac364d2
--- /dev/null
+++ b/src/ec/kontron/it8516e/acpi/pm_channels.asl
@@ -0,0 +1,115 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 secunet Security Networks AG
+ *
+ * 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
+ */
+
+#ifdef IT8516E_FIRST_DATA
+Device (PM1) {
+	Name (_HID, EisaId("PNP0C02"))
+	Name (_STR, Unicode("IT8516E PM Channel 1"))
+	Name (_UID, SUPERIO_UID(PM, 1))
+
+	/*
+	 * The EC firmware exposes CPU temperature through ec ram
+	 * on the first PM channel.
+	 */
+
+	#undef EC_DATA_IO
+	#define EC_DATA_IO IT8516E_FIRST_DATA
+	#undef EC_SC_IO
+	#define EC_SC_IO IT8516E_FIRST_SC
+	#include <ec/acpi/ec.asl>
+
+	Method (_CRS)
+	{
+		/* Announce the used i/o ports to the OS */
+		Return (ResourceTemplate () {
+			IO (Decode16, IT8516E_FIRST_DATA, IT8516E_FIRST_DATA, 0x01, 0x01)
+			IO (Decode16, IT8516E_FIRST_SC, IT8516E_FIRST_SC, 0x01, 0x01)
+		})
+	}
+
+	/*
+	 * Get CPU temperature from first PM channel (in 10th Kelvin)
+	 */
+	Method (CTK)
+	{
+		Store (EC_READ (0x52), Local0)
+		If (And (Local0, EC_ERROR_MASK)) {
+			Return (0)
+		}
+		Multiply (Local0, 10, Local0)	/* Convert to 10th °C */
+		Return (Add (Local0, 2732))	/* Return as 10th Kelvin */
+	}
+}
+#endif
+
+#ifdef IT8516E_SECOND_DATA
+Device (PM2) {
+	Name (_HID, EisaId("PNP0C02"))
+	Name (_STR, Unicode("IT8516E PM Channel 2"))
+	Name (_UID, SUPERIO_UID(PM, 2))
+
+	/*
+	 * The EC firmware exposes fan and GPIO control through the
+	 * second PM channel.
+	 */
+
+	#undef EC_DATA_IO
+	#define EC_DATA_IO IT8516E_SECOND_DATA
+	#undef EC_SC_IO
+	#define EC_SC_IO IT8516E_SECOND_SC
+	#include <ec/acpi/ec.asl>
+
+	Method (_CRS)
+	{
+		/* Announce the used i/o ports to the OS */
+		Return (ResourceTemplate () {
+			IO (Decode16, IT8516E_SECOND_DATA, IT8516E_SECOND_DATA, 0x01, 0x01)
+			IO (Decode16, IT8516E_SECOND_SC, IT8516E_SECOND_SC, 0x01, 0x01)
+		})
+	}
+
+	/*
+	 * Get CPU temperature from second PM channel (in 10th Kelvin)
+	 */
+	Method (CTK)
+	{
+		Acquire (EC_MUTEX, 0xffff)
+		Store (SEND_EC_COMMAND (0x20), Local0) /* GET_CPUTEMP */
+		If (And (Local0, EC_ERROR_MASK)) {
+			Release (EC_MUTEX)
+			Return (0)
+		}
+		Store (RECV_EC_DATA (), Local0)	/* Temp low byte in 64th °C */
+		If (And (Local0, EC_ERROR_MASK)) {
+			Release (EC_MUTEX)
+			Return (0)
+		}
+		Store (RECV_EC_DATA (), Local1)	/* Temp high byte in 64th °C */
+		If (And (Local1, EC_ERROR_MASK)) {
+			Release (EC_MUTEX)
+			Return (0)
+		}
+		Release (EC_MUTEX)
+
+		Or (ShiftLeft (Local1, 8), Local0, Local0)
+		Store (Divide (Multiply (Local0, 10), 64), Local0)	/* Convert to 10th °C */
+		Return (Add (Local0, 2732))				/* Return as 10th Kelvin */
+	}
+}
+#endif